IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / drivers / media / video / w9968cf.c
1 /***************************************************************************
2  * Video4Linux driver for W996[87]CF JPEG USB Dual Mode Camera Chip.       *
3  *                                                                         *
4  * Copyright (C) 2002-2004 by Luca Risolia <luca.risolia@studio.unibo.it>  *
5  *                                                                         *
6  * - Memory management code from bttv driver by Ralph Metzler,             *
7  *   Marcus Metzler and Gerd Knorr.                                        *
8  * - I2C interface to kernel, high-level image sensor control routines and *
9  *   some symbolic names from OV511 driver by Mark W. McClelland.          *
10  * - Low-level I2C fast write function by Piotr Czerczak.                  *
11  * - Low-level I2C read function by Frederic Jouault.                      *
12  *                                                                         *
13  * This program is free software; you can redistribute it and/or modify    *
14  * it under the terms of the GNU General Public License as published by    *
15  * the Free Software Foundation; either version 2 of the License, or       *
16  * (at your option) any later version.                                     *
17  *                                                                         *
18  * This program is distributed in the hope that it will be useful,         *
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
21  * GNU General Public License for more details.                            *
22  *                                                                         *
23  * You should have received a copy of the GNU General Public License       *
24  * along with this program; if not, write to the Free Software             *
25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
26  ***************************************************************************/
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/kmod.h>
31 #include <linux/init.h>
32 #include <linux/fs.h>
33 #include <linux/vmalloc.h>
34 #include <linux/slab.h>
35 #include <linux/mm.h>
36 #include <linux/string.h>
37 #include <linux/errno.h>
38 #include <linux/sched.h>
39 #include <linux/ioctl.h>
40 #include <linux/delay.h>
41 #include <linux/stddef.h>
42 #include <asm/page.h>
43 #include <asm/uaccess.h>
44 #include <linux/page-flags.h>
45 #include <linux/moduleparam.h>
46
47 #include "w9968cf.h"
48 #include "w9968cf_decoder.h"
49
50 static struct w9968cf_vpp_t* w9968cf_vpp;
51 static DECLARE_WAIT_QUEUE_HEAD(w9968cf_vppmod_wait);
52
53 static LIST_HEAD(w9968cf_dev_list); /* head of V4L registered cameras list */
54 static DEFINE_MUTEX(w9968cf_devlist_mutex); /* semaphore for list traversal */
55
56 static DECLARE_RWSEM(w9968cf_disconnect); /* prevent races with open() */
57
58
59 /****************************************************************************
60  * Module macros and parameters                                             *
61  ****************************************************************************/
62
63 MODULE_DEVICE_TABLE(usb, winbond_id_table);
64
65 MODULE_AUTHOR(W9968CF_MODULE_AUTHOR" "W9968CF_AUTHOR_EMAIL);
66 MODULE_DESCRIPTION(W9968CF_MODULE_NAME);
67 MODULE_VERSION(W9968CF_MODULE_VERSION);
68 MODULE_LICENSE(W9968CF_MODULE_LICENSE);
69 MODULE_SUPPORTED_DEVICE("Video");
70
71 static int ovmod_load = W9968CF_OVMOD_LOAD;
72 static unsigned short simcams = W9968CF_SIMCAMS;
73 static short video_nr[]={[0 ... W9968CF_MAX_DEVICES-1] = -1}; /*-1=first free*/
74 static unsigned int packet_size[] = {[0 ... W9968CF_MAX_DEVICES-1] =
75                                      W9968CF_PACKET_SIZE};
76 static unsigned short max_buffers[] = {[0 ... W9968CF_MAX_DEVICES-1] =
77                                        W9968CF_BUFFERS};
78 static int double_buffer[] = {[0 ... W9968CF_MAX_DEVICES-1] =
79                               W9968CF_DOUBLE_BUFFER};
80 static int clamping[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_CLAMPING};
81 static unsigned short filter_type[]= {[0 ... W9968CF_MAX_DEVICES-1] =
82                                       W9968CF_FILTER_TYPE};
83 static int largeview[]= {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_LARGEVIEW};
84 static unsigned short decompression[] = {[0 ... W9968CF_MAX_DEVICES-1] =
85                                          W9968CF_DECOMPRESSION};
86 static int upscaling[]= {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_UPSCALING};
87 static unsigned short force_palette[] = {[0 ... W9968CF_MAX_DEVICES-1] = 0};
88 static int force_rgb[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_FORCE_RGB};
89 static int autobright[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_AUTOBRIGHT};
90 static int autoexp[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_AUTOEXP};
91 static unsigned short lightfreq[] = {[0 ... W9968CF_MAX_DEVICES-1] =
92                                      W9968CF_LIGHTFREQ};
93 static int bandingfilter[] = {[0 ... W9968CF_MAX_DEVICES-1]=
94                               W9968CF_BANDINGFILTER};
95 static short clockdiv[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_CLOCKDIV};
96 static int backlight[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_BACKLIGHT};
97 static int mirror[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_MIRROR};
98 static int monochrome[] = {[0 ... W9968CF_MAX_DEVICES-1]=W9968CF_MONOCHROME};
99 static unsigned int brightness[] = {[0 ... W9968CF_MAX_DEVICES-1] =
100                                     W9968CF_BRIGHTNESS};
101 static unsigned int hue[] = {[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_HUE};
102 static unsigned int colour[]={[0 ... W9968CF_MAX_DEVICES-1] = W9968CF_COLOUR};
103 static unsigned int contrast[] = {[0 ... W9968CF_MAX_DEVICES-1] =
104                                   W9968CF_CONTRAST};
105 static unsigned int whiteness[] = {[0 ... W9968CF_MAX_DEVICES-1] =
106                                    W9968CF_WHITENESS};
107 #ifdef W9968CF_DEBUG
108 static unsigned short debug = W9968CF_DEBUG_LEVEL;
109 static int specific_debug = W9968CF_SPECIFIC_DEBUG;
110 #endif
111
112 static unsigned int param_nv[24]; /* number of values per parameter */
113
114 #ifdef CONFIG_KMOD
115 module_param(ovmod_load, bool, 0644);
116 #endif
117 module_param(simcams, ushort, 0644);
118 module_param_array(video_nr, short, &param_nv[0], 0444);
119 module_param_array(packet_size, uint, &param_nv[1], 0444);
120 module_param_array(max_buffers, ushort, &param_nv[2], 0444);
121 module_param_array(double_buffer, bool, &param_nv[3], 0444);
122 module_param_array(clamping, bool, &param_nv[4], 0444);
123 module_param_array(filter_type, ushort, &param_nv[5], 0444);
124 module_param_array(largeview, bool, &param_nv[6], 0444);
125 module_param_array(decompression, ushort, &param_nv[7], 0444);
126 module_param_array(upscaling, bool, &param_nv[8], 0444);
127 module_param_array(force_palette, ushort, &param_nv[9], 0444);
128 module_param_array(force_rgb, ushort, &param_nv[10], 0444);
129 module_param_array(autobright, bool, &param_nv[11], 0444);
130 module_param_array(autoexp, bool, &param_nv[12], 0444);
131 module_param_array(lightfreq, ushort, &param_nv[13], 0444);
132 module_param_array(bandingfilter, bool, &param_nv[14], 0444);
133 module_param_array(clockdiv, short, &param_nv[15], 0444);
134 module_param_array(backlight, bool, &param_nv[16], 0444);
135 module_param_array(mirror, bool, &param_nv[17], 0444);
136 module_param_array(monochrome, bool, &param_nv[18], 0444);
137 module_param_array(brightness, uint, &param_nv[19], 0444);
138 module_param_array(hue, uint, &param_nv[20], 0444);
139 module_param_array(colour, uint, &param_nv[21], 0444);
140 module_param_array(contrast, uint, &param_nv[22], 0444);
141 module_param_array(whiteness, uint, &param_nv[23], 0444);
142 #ifdef W9968CF_DEBUG
143 module_param(debug, ushort, 0644);
144 module_param(specific_debug, bool, 0644);
145 #endif
146
147 #ifdef CONFIG_KMOD
148 MODULE_PARM_DESC(ovmod_load,
149                  "\n<0|1> Automatic 'ovcamchip' module loading."
150                  "\n0 disabled, 1 enabled."
151                  "\nIf enabled,'insmod' searches for the required 'ovcamchip'"
152                  "\nmodule in the system, according to its configuration, and"
153                  "\nattempts to load that module automatically. This action is"
154                  "\nperformed once as soon as the 'w9968cf' module is loaded"
155                  "\ninto memory."
156                  "\nDefault value is "__MODULE_STRING(W9968CF_OVMOD_LOAD)"."
157                  "\n");
158 #endif
159 MODULE_PARM_DESC(simcams,
160                  "\n<n> Number of cameras allowed to stream simultaneously."
161                  "\nn may vary from 0 to "
162                  __MODULE_STRING(W9968CF_MAX_DEVICES)"."
163                  "\nDefault value is "__MODULE_STRING(W9968CF_SIMCAMS)"."
164                  "\n");
165 MODULE_PARM_DESC(video_nr,
166                  "\n<-1|n[,...]> Specify V4L minor mode number."
167                  "\n -1 = use next available (default)"
168                  "\n  n = use minor number n (integer >= 0)"
169                  "\nYou can specify up to "__MODULE_STRING(W9968CF_MAX_DEVICES)
170                  " cameras this way."
171                  "\nFor example:"
172                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
173                  "\nthe second camera and use auto for the first"
174                  "\none and for every other camera."
175                  "\n");
176 MODULE_PARM_DESC(packet_size,
177                  "\n<n[,...]> Specify the maximum data payload"
178                  "\nsize in bytes for alternate settings, for each device."
179                  "\nn is scaled between 63 and 1023 "
180                  "(default is "__MODULE_STRING(W9968CF_PACKET_SIZE)")."
181                  "\n");
182 MODULE_PARM_DESC(max_buffers,
183                  "\n<n[,...]> For advanced users."
184                  "\nSpecify the maximum number of video frame buffers"
185                  "\nto allocate for each device, from 2 to "
186                  __MODULE_STRING(W9968CF_MAX_BUFFERS)
187                  ". (default is "__MODULE_STRING(W9968CF_BUFFERS)")."
188                  "\n");
189 MODULE_PARM_DESC(double_buffer,
190                  "\n<0|1[,...]> "
191                  "Hardware double buffering: 0 disabled, 1 enabled."
192                  "\nIt should be enabled if you want smooth video output: if"
193                  "\nyou obtain out of sync. video, disable it, or try to"
194                  "\ndecrease the 'clockdiv' module parameter value."
195                  "\nDefault value is "__MODULE_STRING(W9968CF_DOUBLE_BUFFER)
196                  " for every device."
197                  "\n");
198 MODULE_PARM_DESC(clamping,
199                  "\n<0|1[,...]> Video data clamping: 0 disabled, 1 enabled."
200                  "\nDefault value is "__MODULE_STRING(W9968CF_CLAMPING)
201                  " for every device."
202                  "\n");
203 MODULE_PARM_DESC(filter_type,
204                  "\n<0|1|2[,...]> Video filter type."
205                  "\n0 none, 1 (1-2-1) 3-tap filter, "
206                  "2 (2-3-6-3-2) 5-tap filter."
207                  "\nDefault value is "__MODULE_STRING(W9968CF_FILTER_TYPE)
208                  " for every device."
209                  "\nThe filter is used to reduce noise and aliasing artifacts"
210                  "\nproduced by the CCD or CMOS image sensor, and the scaling"
211                  " process."
212                  "\n");
213 MODULE_PARM_DESC(largeview,
214                  "\n<0|1[,...]> Large view: 0 disabled, 1 enabled."
215                  "\nDefault value is "__MODULE_STRING(W9968CF_LARGEVIEW)
216                  " for every device."
217                  "\n");
218 MODULE_PARM_DESC(upscaling,
219                  "\n<0|1[,...]> Software scaling (for non-compressed video):"
220                  "\n0 disabled, 1 enabled."
221                  "\nDisable it if you have a slow CPU or you don't have"
222                  " enough memory."
223                  "\nDefault value is "__MODULE_STRING(W9968CF_UPSCALING)
224                  " for every device."
225                  "\nIf 'w9968cf-vpp' is not present, this parameter is"
226                  " set to 0."
227                  "\n");
228 MODULE_PARM_DESC(decompression,
229                  "\n<0|1|2[,...]> Software video decompression:"
230                  "\n- 0 disables decompression (doesn't allow formats needing"
231                  " decompression)"
232                  "\n- 1 forces decompression (allows formats needing"
233                  " decompression only);"
234                  "\n- 2 allows any permitted formats."
235                  "\nFormats supporting compressed video are YUV422P and"
236                  " YUV420P/YUV420 "
237                  "\nin any resolutions where both width and height are "
238                  "a multiple of 16."
239                  "\nDefault value is "__MODULE_STRING(W9968CF_DECOMPRESSION)
240                  " for every device."
241                  "\nIf 'w9968cf-vpp' is not present, forcing decompression is "
242                  "\nnot allowed; in this case this parameter is set to 2."
243                  "\n");
244 MODULE_PARM_DESC(force_palette,
245                  "\n<0"
246                  "|" __MODULE_STRING(VIDEO_PALETTE_UYVY)
247                  "|" __MODULE_STRING(VIDEO_PALETTE_YUV420)
248                  "|" __MODULE_STRING(VIDEO_PALETTE_YUV422P)
249                  "|" __MODULE_STRING(VIDEO_PALETTE_YUV420P)
250                  "|" __MODULE_STRING(VIDEO_PALETTE_YUYV)
251                  "|" __MODULE_STRING(VIDEO_PALETTE_YUV422)
252                  "|" __MODULE_STRING(VIDEO_PALETTE_GREY)
253                  "|" __MODULE_STRING(VIDEO_PALETTE_RGB555)
254                  "|" __MODULE_STRING(VIDEO_PALETTE_RGB565)
255                  "|" __MODULE_STRING(VIDEO_PALETTE_RGB24)
256                  "|" __MODULE_STRING(VIDEO_PALETTE_RGB32)
257                  "[,...]>"
258                  " Force picture palette."
259                  "\nIn order:"
260                  "\n- 0 allows any of the following formats:"
261                  "\n- UYVY    16 bpp - Original video, compression disabled"
262                  "\n- YUV420  12 bpp - Original video, compression enabled"
263                  "\n- YUV422P 16 bpp - Original video, compression enabled"
264                  "\n- YUV420P 12 bpp - Original video, compression enabled"
265                  "\n- YUVY    16 bpp - Software conversion from UYVY"
266                  "\n- YUV422  16 bpp - Software conversion from UYVY"
267                  "\n- GREY     8 bpp - Software conversion from UYVY"
268                  "\n- RGB555  16 bpp - Software conversion from UYVY"
269                  "\n- RGB565  16 bpp - Software conversion from UYVY"
270                  "\n- RGB24   24 bpp - Software conversion from UYVY"
271                  "\n- RGB32   32 bpp - Software conversion from UYVY"
272                  "\nWhen not 0, this parameter will override 'decompression'."
273                  "\nDefault value is 0 for every device."
274                  "\nInitial palette is "
275                  __MODULE_STRING(W9968CF_PALETTE_DECOMP_ON)"."
276                  "\nIf 'w9968cf-vpp' is not present, this parameter is"
277                  " set to 9 (UYVY)."
278                  "\n");
279 MODULE_PARM_DESC(force_rgb,
280                  "\n<0|1[,...]> Read RGB video data instead of BGR:"
281                  "\n 1 = use RGB component ordering."
282                  "\n 0 = use BGR component ordering."
283                  "\nThis parameter has effect when using RGBX palettes only."
284                  "\nDefault value is "__MODULE_STRING(W9968CF_FORCE_RGB)
285                  " for every device."
286                  "\n");
287 MODULE_PARM_DESC(autobright,
288                  "\n<0|1[,...]> Image sensor automatically changes brightness:"
289                  "\n 0 = no, 1 = yes"
290                  "\nDefault value is "__MODULE_STRING(W9968CF_AUTOBRIGHT)
291                  " for every device."
292                  "\n");
293 MODULE_PARM_DESC(autoexp,
294                  "\n<0|1[,...]> Image sensor automatically changes exposure:"
295                  "\n 0 = no, 1 = yes"
296                  "\nDefault value is "__MODULE_STRING(W9968CF_AUTOEXP)
297                  " for every device."
298                  "\n");
299 MODULE_PARM_DESC(lightfreq,
300                  "\n<50|60[,...]> Light frequency in Hz:"
301                  "\n 50 for European and Asian lighting,"
302                  " 60 for American lighting."
303                  "\nDefault value is "__MODULE_STRING(W9968CF_LIGHTFREQ)
304                  " for every device."
305                  "\n");
306 MODULE_PARM_DESC(bandingfilter,
307                  "\n<0|1[,...]> Banding filter to reduce effects of"
308                  " fluorescent lighting:"
309                  "\n 0 disabled, 1 enabled."
310                  "\nThis filter tries to reduce the pattern of horizontal"
311                  "\nlight/dark bands caused by some (usually fluorescent)"
312                  " lighting."
313                  "\nDefault value is "__MODULE_STRING(W9968CF_BANDINGFILTER)
314                  " for every device."
315                  "\n");
316 MODULE_PARM_DESC(clockdiv,
317                  "\n<-1|n[,...]> "
318                  "Force pixel clock divisor to a specific value (for experts):"
319                  "\n  n may vary from 0 to 127."
320                  "\n -1 for automatic value."
321                  "\nSee also the 'double_buffer' module parameter."
322                  "\nDefault value is "__MODULE_STRING(W9968CF_CLOCKDIV)
323                  " for every device."
324                  "\n");
325 MODULE_PARM_DESC(backlight,
326                  "\n<0|1[,...]> Objects are lit from behind:"
327                  "\n 0 = no, 1 = yes"
328                  "\nDefault value is "__MODULE_STRING(W9968CF_BACKLIGHT)
329                  " for every device."
330                  "\n");
331 MODULE_PARM_DESC(mirror,
332                  "\n<0|1[,...]> Reverse image horizontally:"
333                  "\n 0 = no, 1 = yes"
334                  "\nDefault value is "__MODULE_STRING(W9968CF_MIRROR)
335                  " for every device."
336                  "\n");
337 MODULE_PARM_DESC(monochrome,
338                  "\n<0|1[,...]> Use image sensor as monochrome sensor:"
339                  "\n 0 = no, 1 = yes"
340                  "\nNot all the sensors support monochrome color."
341                  "\nDefault value is "__MODULE_STRING(W9968CF_MONOCHROME)
342                  " for every device."
343                  "\n");
344 MODULE_PARM_DESC(brightness,
345                  "\n<n[,...]> Set picture brightness (0-65535)."
346                  "\nDefault value is "__MODULE_STRING(W9968CF_BRIGHTNESS)
347                  " for every device."
348                  "\nThis parameter has no effect if 'autobright' is enabled."
349                  "\n");
350 MODULE_PARM_DESC(hue,
351                  "\n<n[,...]> Set picture hue (0-65535)."
352                  "\nDefault value is "__MODULE_STRING(W9968CF_HUE)
353                  " for every device."
354                  "\n");
355 MODULE_PARM_DESC(colour,
356                  "\n<n[,...]> Set picture saturation (0-65535)."
357                  "\nDefault value is "__MODULE_STRING(W9968CF_COLOUR)
358                  " for every device."
359                  "\n");
360 MODULE_PARM_DESC(contrast,
361                  "\n<n[,...]> Set picture contrast (0-65535)."
362                  "\nDefault value is "__MODULE_STRING(W9968CF_CONTRAST)
363                  " for every device."
364                  "\n");
365 MODULE_PARM_DESC(whiteness,
366                  "\n<n[,...]> Set picture whiteness (0-65535)."
367                  "\nDefault value is "__MODULE_STRING(W9968CF_WHITENESS)
368                  " for every device."
369                  "\n");
370 #ifdef W9968CF_DEBUG
371 MODULE_PARM_DESC(debug,
372                  "\n<n> Debugging information level, from 0 to 6:"
373                  "\n0 = none (use carefully)"
374                  "\n1 = critical errors"
375                  "\n2 = significant informations"
376                  "\n3 = configuration or general messages"
377                  "\n4 = warnings"
378                  "\n5 = called functions"
379                  "\n6 = function internals"
380                  "\nLevel 5 and 6 are useful for testing only, when only "
381                  "one device is used."
382                  "\nDefault value is "__MODULE_STRING(W9968CF_DEBUG_LEVEL)"."
383                  "\n");
384 MODULE_PARM_DESC(specific_debug,
385                  "\n<0|1> Enable or disable specific debugging messages:"
386                  "\n0 = print messages concerning every level"
387                  " <= 'debug' level."
388                  "\n1 = print messages concerning the level"
389                  " indicated by 'debug'."
390                  "\nDefault value is "
391                  __MODULE_STRING(W9968CF_SPECIFIC_DEBUG)"."
392                  "\n");
393 #endif /* W9968CF_DEBUG */
394
395
396
397 /****************************************************************************
398  * Some prototypes                                                          *
399  ****************************************************************************/
400
401 /* Video4linux interface */
402 static struct file_operations w9968cf_fops;
403 static int w9968cf_open(struct inode*, struct file*);
404 static int w9968cf_release(struct inode*, struct file*);
405 static int w9968cf_mmap(struct file*, struct vm_area_struct*);
406 static int w9968cf_ioctl(struct inode*, struct file*, unsigned, unsigned long);
407 static ssize_t w9968cf_read(struct file*, char __user *, size_t, loff_t*);
408 static int w9968cf_v4l_ioctl(struct inode*, struct file*, unsigned int,
409                              void __user *);
410
411 /* USB-specific */
412 static int w9968cf_start_transfer(struct w9968cf_device*);
413 static int w9968cf_stop_transfer(struct w9968cf_device*);
414 static int w9968cf_write_reg(struct w9968cf_device*, u16 value, u16 index);
415 static int w9968cf_read_reg(struct w9968cf_device*, u16 index);
416 static int w9968cf_write_fsb(struct w9968cf_device*, u16* data);
417 static int w9968cf_write_sb(struct w9968cf_device*, u16 value);
418 static int w9968cf_read_sb(struct w9968cf_device*);
419 static int w9968cf_upload_quantizationtables(struct w9968cf_device*);
420 static void w9968cf_urb_complete(struct urb *urb);
421
422 /* Low-level I2C (SMBus) I/O */
423 static int w9968cf_smbus_start(struct w9968cf_device*);
424 static int w9968cf_smbus_stop(struct w9968cf_device*);
425 static int w9968cf_smbus_write_byte(struct w9968cf_device*, u8 v);
426 static int w9968cf_smbus_read_byte(struct w9968cf_device*, u8* v);
427 static int w9968cf_smbus_write_ack(struct w9968cf_device*);
428 static int w9968cf_smbus_read_ack(struct w9968cf_device*);
429 static int w9968cf_smbus_refresh_bus(struct w9968cf_device*);
430 static int w9968cf_i2c_adap_read_byte(struct w9968cf_device* cam,
431                                       u16 address, u8* value);
432 static int w9968cf_i2c_adap_read_byte_data(struct w9968cf_device*, u16 address,
433                                            u8 subaddress, u8* value);
434 static int w9968cf_i2c_adap_write_byte(struct w9968cf_device*,
435                                        u16 address, u8 subaddress);
436 static int w9968cf_i2c_adap_fastwrite_byte_data(struct w9968cf_device*,
437                                                 u16 address, u8 subaddress,
438                                                 u8 value);
439
440 /* I2C interface to kernel */
441 static int w9968cf_i2c_init(struct w9968cf_device*);
442 static int w9968cf_i2c_smbus_xfer(struct i2c_adapter*, u16 addr,
443                                   unsigned short flags, char read_write,
444                                   u8 command, int size, union i2c_smbus_data*);
445 static u32 w9968cf_i2c_func(struct i2c_adapter*);
446 static int w9968cf_i2c_attach_inform(struct i2c_client*);
447 static int w9968cf_i2c_detach_inform(struct i2c_client*);
448 static int w9968cf_i2c_control(struct i2c_adapter*, unsigned int cmd,
449                                unsigned long arg);
450
451 /* Memory management */
452 static void* rvmalloc(unsigned long size);
453 static void rvfree(void *mem, unsigned long size);
454 static void w9968cf_deallocate_memory(struct w9968cf_device*);
455 static int  w9968cf_allocate_memory(struct w9968cf_device*);
456
457 /* High-level image sensor control functions */
458 static int w9968cf_sensor_set_control(struct w9968cf_device*,int cid,int val);
459 static int w9968cf_sensor_get_control(struct w9968cf_device*,int cid,int *val);
460 static int w9968cf_sensor_cmd(struct w9968cf_device*,
461                               unsigned int cmd, void *arg);
462 static int w9968cf_sensor_init(struct w9968cf_device*);
463 static int w9968cf_sensor_update_settings(struct w9968cf_device*);
464 static int w9968cf_sensor_get_picture(struct w9968cf_device*);
465 static int w9968cf_sensor_update_picture(struct w9968cf_device*,
466                                          struct video_picture pict);
467
468 /* Other helper functions */
469 static void w9968cf_configure_camera(struct w9968cf_device*,struct usb_device*,
470                                      enum w9968cf_model_id,
471                                      const unsigned short dev_nr);
472 static void w9968cf_adjust_configuration(struct w9968cf_device*);
473 static int w9968cf_turn_on_led(struct w9968cf_device*);
474 static int w9968cf_init_chip(struct w9968cf_device*);
475 static inline u16 w9968cf_valid_palette(u16 palette);
476 static inline u16 w9968cf_valid_depth(u16 palette);
477 static inline u8 w9968cf_need_decompression(u16 palette);
478 static int w9968cf_set_picture(struct w9968cf_device*, struct video_picture);
479 static int w9968cf_set_window(struct w9968cf_device*, struct video_window);
480 static int w9968cf_postprocess_frame(struct w9968cf_device*,
481                                      struct w9968cf_frame_t*);
482 static int w9968cf_adjust_window_size(struct w9968cf_device*, u16* w, u16* h);
483 static void w9968cf_init_framelist(struct w9968cf_device*);
484 static void w9968cf_push_frame(struct w9968cf_device*, u8 f_num);
485 static void w9968cf_pop_frame(struct w9968cf_device*,struct w9968cf_frame_t**);
486 static void w9968cf_release_resources(struct w9968cf_device*);
487
488
489
490 /****************************************************************************
491  * Symbolic names                                                           *
492  ****************************************************************************/
493
494 /* Used to represent a list of values and their respective symbolic names */
495 struct w9968cf_symbolic_list {
496         const int num;
497         const char *name;
498 };
499
500 /*--------------------------------------------------------------------------
501   Returns the name of the matching element in the symbolic_list array. The
502   end of the list must be marked with an element that has a NULL name.
503   --------------------------------------------------------------------------*/
504 static inline const char *
505 symbolic(struct w9968cf_symbolic_list list[], const int num)
506 {
507         int i;
508
509         for (i = 0; list[i].name != NULL; i++)
510                 if (list[i].num == num)
511                         return (list[i].name);
512
513         return "Unknown";
514 }
515
516 static struct w9968cf_symbolic_list camlist[] = {
517         { W9968CF_MOD_GENERIC, "W996[87]CF JPEG USB Dual Mode Camera" },
518         { W9968CF_MOD_CLVBWGP, "Creative Labs Video Blaster WebCam Go Plus" },
519
520         /* Other cameras (having the same descriptors as Generic W996[87]CF) */
521         { W9968CF_MOD_ADPVDMA, "Aroma Digi Pen VGA Dual Mode ADG-5000" },
522         { W9986CF_MOD_AAU, "AVerMedia AVerTV USB" },
523         { W9968CF_MOD_CLVBWG, "Creative Labs Video Blaster WebCam Go" },
524         { W9968CF_MOD_LL, "Lebon LDC-035A" },
525         { W9968CF_MOD_EEEMC, "Ezonics EZ-802 EZMega Cam" },
526         { W9968CF_MOD_OOE, "OmniVision OV8610-EDE" },
527         { W9968CF_MOD_ODPVDMPC, "OPCOM Digi Pen VGA Dual Mode Pen Camera" },
528         { W9968CF_MOD_PDPII, "Pretec Digi Pen-II" },
529         { W9968CF_MOD_PDP480, "Pretec DigiPen-480" },
530
531         {  -1, NULL }
532 };
533
534 static struct w9968cf_symbolic_list senlist[] = {
535         { CC_OV76BE,   "OV76BE" },
536         { CC_OV7610,   "OV7610" },
537         { CC_OV7620,   "OV7620" },
538         { CC_OV7620AE, "OV7620AE" },
539         { CC_OV6620,   "OV6620" },
540         { CC_OV6630,   "OV6630" },
541         { CC_OV6630AE, "OV6630AE" },
542         { CC_OV6630AF, "OV6630AF" },
543         { -1, NULL }
544 };
545
546 /* Video4Linux1 palettes */
547 static struct w9968cf_symbolic_list v4l1_plist[] = {
548         { VIDEO_PALETTE_GREY,    "GREY" },
549         { VIDEO_PALETTE_HI240,   "HI240" },
550         { VIDEO_PALETTE_RGB565,  "RGB565" },
551         { VIDEO_PALETTE_RGB24,   "RGB24" },
552         { VIDEO_PALETTE_RGB32,   "RGB32" },
553         { VIDEO_PALETTE_RGB555,  "RGB555" },
554         { VIDEO_PALETTE_YUV422,  "YUV422" },
555         { VIDEO_PALETTE_YUYV,    "YUYV" },
556         { VIDEO_PALETTE_UYVY,    "UYVY" },
557         { VIDEO_PALETTE_YUV420,  "YUV420" },
558         { VIDEO_PALETTE_YUV411,  "YUV411" },
559         { VIDEO_PALETTE_RAW,     "RAW" },
560         { VIDEO_PALETTE_YUV422P, "YUV422P" },
561         { VIDEO_PALETTE_YUV411P, "YUV411P" },
562         { VIDEO_PALETTE_YUV420P, "YUV420P" },
563         { VIDEO_PALETTE_YUV410P, "YUV410P" },
564         { -1, NULL }
565 };
566
567 /* Decoder error codes: */
568 static struct w9968cf_symbolic_list decoder_errlist[] = {
569         { W9968CF_DEC_ERR_CORRUPTED_DATA, "Corrupted data" },
570         { W9968CF_DEC_ERR_BUF_OVERFLOW,   "Buffer overflow" },
571         { W9968CF_DEC_ERR_NO_SOI,         "SOI marker not found" },
572         { W9968CF_DEC_ERR_NO_SOF0,        "SOF0 marker not found" },
573         { W9968CF_DEC_ERR_NO_SOS,         "SOS marker not found" },
574         { W9968CF_DEC_ERR_NO_EOI,         "EOI marker not found" },
575         { -1, NULL }
576 };
577
578 /* URB error codes: */
579 static struct w9968cf_symbolic_list urb_errlist[] = {
580         { -ENOMEM,    "No memory for allocation of internal structures" },
581         { -ENOSPC,    "The host controller's bandwidth is already consumed" },
582         { -ENOENT,    "URB was canceled by unlink_urb" },
583         { -EXDEV,     "ISO transfer only partially completed" },
584         { -EAGAIN,    "Too match scheduled for the future" },
585         { -ENXIO,     "URB already queued" },
586         { -EFBIG,     "Too much ISO frames requested" },
587         { -ENOSR,     "Buffer error (overrun)" },
588         { -EPIPE,     "Specified endpoint is stalled (device not responding)"},
589         { -EOVERFLOW, "Babble (too much data)" },
590         { -EPROTO,    "Bit-stuff error (bad cable?)" },
591         { -EILSEQ,    "CRC/Timeout" },
592         { -ETIME,     "Device does not respond to token" },
593         { -ETIMEDOUT, "Device does not respond to command" },
594         { -1, NULL }
595 };
596
597 /****************************************************************************
598  * Memory management functions                                              *
599  ****************************************************************************/
600 static void* rvmalloc(unsigned long size)
601 {
602         void* mem;
603         unsigned long adr;
604
605         size = PAGE_ALIGN(size);
606         mem = vmalloc_32(size);
607         if (!mem)
608                 return NULL;
609
610         memset(mem, 0, size); /* Clear the ram out, no junk to the user */
611         adr = (unsigned long) mem;
612         while (size > 0) {
613                 SetPageReserved(vmalloc_to_page((void *)adr));
614                 adr += PAGE_SIZE;
615                 size -= PAGE_SIZE;
616         }
617
618         return mem;
619 }
620
621
622 static void rvfree(void* mem, unsigned long size)
623 {
624         unsigned long adr;
625
626         if (!mem)
627                 return;
628
629         adr = (unsigned long) mem;
630         while ((long) size > 0) {
631                 ClearPageReserved(vmalloc_to_page((void *)adr));
632                 adr += PAGE_SIZE;
633                 size -= PAGE_SIZE;
634         }
635         vfree(mem);
636 }
637
638
639 /*--------------------------------------------------------------------------
640   Deallocate previously allocated memory.
641   --------------------------------------------------------------------------*/
642 static void w9968cf_deallocate_memory(struct w9968cf_device* cam)
643 {
644         u8 i;
645
646         /* Free the isochronous transfer buffers */
647         for (i = 0; i < W9968CF_URBS; i++) {
648                 kfree(cam->transfer_buffer[i]);
649                 cam->transfer_buffer[i] = NULL;
650         }
651
652         /* Free temporary frame buffer */
653         if (cam->frame_tmp.buffer) {
654                 rvfree(cam->frame_tmp.buffer, cam->frame_tmp.size);
655                 cam->frame_tmp.buffer = NULL;
656         }
657
658         /* Free helper buffer */
659         if (cam->frame_vpp.buffer) {
660                 rvfree(cam->frame_vpp.buffer, cam->frame_vpp.size);
661                 cam->frame_vpp.buffer = NULL;
662         }
663
664         /* Free video frame buffers */
665         if (cam->frame[0].buffer) {
666                 rvfree(cam->frame[0].buffer, cam->nbuffers*cam->frame[0].size);
667                 cam->frame[0].buffer = NULL;
668         }
669
670         cam->nbuffers = 0;
671
672         DBG(5, "Memory successfully deallocated")
673 }
674
675
676 /*--------------------------------------------------------------------------
677   Allocate memory buffers for USB transfers and video frames.
678   This function is called by open() only.
679   Return 0 on success, a negative number otherwise.
680   --------------------------------------------------------------------------*/
681 static int w9968cf_allocate_memory(struct w9968cf_device* cam)
682 {
683         const u16 p_size = wMaxPacketSize[cam->altsetting-1];
684         void* buff = NULL;
685         unsigned long hw_bufsize, vpp_bufsize;
686         u8 i, bpp;
687
688         /* NOTE: Deallocation is done elsewhere in case of error */
689
690         /* Calculate the max amount of raw data per frame from the device */
691         hw_bufsize = cam->maxwidth*cam->maxheight*2;
692
693         /* Calculate the max buf. size needed for post-processing routines */
694         bpp = (w9968cf_vpp) ? 4 : 2;
695         if (cam->upscaling)
696                 vpp_bufsize = max(W9968CF_MAX_WIDTH*W9968CF_MAX_HEIGHT*bpp,
697                                   cam->maxwidth*cam->maxheight*bpp);
698         else
699                 vpp_bufsize = cam->maxwidth*cam->maxheight*bpp;
700
701         /* Allocate memory for the isochronous transfer buffers */
702         for (i = 0; i < W9968CF_URBS; i++) {
703                 if (!(cam->transfer_buffer[i] =
704                       kzalloc(W9968CF_ISO_PACKETS*p_size, GFP_KERNEL))) {
705                         DBG(1, "Couldn't allocate memory for the isochronous "
706                                "transfer buffers (%u bytes)",
707                             p_size * W9968CF_ISO_PACKETS)
708                         return -ENOMEM;
709                 }
710         }
711
712         /* Allocate memory for the temporary frame buffer */
713         if (!(cam->frame_tmp.buffer = rvmalloc(hw_bufsize))) {
714                 DBG(1, "Couldn't allocate memory for the temporary "
715                        "video frame buffer (%lu bytes)", hw_bufsize)
716                 return -ENOMEM;
717         }
718         cam->frame_tmp.size = hw_bufsize;
719         cam->frame_tmp.number = -1;
720
721         /* Allocate memory for the helper buffer */
722         if (w9968cf_vpp) {
723                 if (!(cam->frame_vpp.buffer = rvmalloc(vpp_bufsize))) {
724                         DBG(1, "Couldn't allocate memory for the helper buffer"
725                                " (%lu bytes)", vpp_bufsize)
726                         return -ENOMEM;
727                 }
728                 cam->frame_vpp.size = vpp_bufsize;
729         } else
730                 cam->frame_vpp.buffer = NULL;
731
732         /* Allocate memory for video frame buffers */
733         cam->nbuffers = cam->max_buffers;
734         while (cam->nbuffers >= 2) {
735                 if ((buff = rvmalloc(cam->nbuffers * vpp_bufsize)))
736                         break;
737                 else
738                         cam->nbuffers--;
739         }
740
741         if (!buff) {
742                 DBG(1, "Couldn't allocate memory for the video frame buffers")
743                 cam->nbuffers = 0;
744                 return -ENOMEM;
745         }
746
747         if (cam->nbuffers != cam->max_buffers)
748                 DBG(2, "Couldn't allocate memory for %u video frame buffers. "
749                        "Only memory for %u buffers has been allocated",
750                     cam->max_buffers, cam->nbuffers)
751
752         for (i = 0; i < cam->nbuffers; i++) {
753                 cam->frame[i].buffer = buff + i*vpp_bufsize;
754                 cam->frame[i].size = vpp_bufsize;
755                 cam->frame[i].number = i;
756                 /* Circular list */
757                 if (i != cam->nbuffers-1)
758                         cam->frame[i].next = &cam->frame[i+1];
759                 else
760                         cam->frame[i].next = &cam->frame[0];
761                 cam->frame[i].status = F_UNUSED;
762         }
763
764         DBG(5, "Memory successfully allocated")
765         return 0;
766 }
767
768
769
770 /****************************************************************************
771  * USB-specific functions                                                   *
772  ****************************************************************************/
773
774 /*--------------------------------------------------------------------------
775   This is an handler function which is called after the URBs are completed.
776   It collects multiple data packets coming from the camera by putting them
777   into frame buffers: one or more zero data length data packets are used to
778   mark the end of a video frame; the first non-zero data packet is the start
779   of the next video frame; if an error is encountered in a packet, the entire
780   video frame is discarded and grabbed again.
781   If there are no requested frames in the FIFO list, packets are collected into
782   a temporary buffer.
783   --------------------------------------------------------------------------*/
784 static void w9968cf_urb_complete(struct urb *urb)
785 {
786         struct w9968cf_device* cam = (struct w9968cf_device*)urb->context;
787         struct w9968cf_frame_t** f;
788         unsigned int len, status;
789         void* pos;
790         u8 i;
791         int err = 0;
792
793         if ((!cam->streaming) || cam->disconnected) {
794                 DBG(4, "Got interrupt, but not streaming")
795                 return;
796         }
797
798         /* "(*f)" will be used instead of "cam->frame_current" */
799         f = &cam->frame_current;
800
801         /* If a frame has been requested and we are grabbing into
802            the temporary frame, we'll switch to that requested frame */
803         if ((*f) == &cam->frame_tmp && *cam->requested_frame) {
804                 if (cam->frame_tmp.status == F_GRABBING) {
805                         w9968cf_pop_frame(cam, &cam->frame_current);
806                         (*f)->status = F_GRABBING;
807                         (*f)->length = cam->frame_tmp.length;
808                         memcpy((*f)->buffer, cam->frame_tmp.buffer,
809                                (*f)->length);
810                         DBG(6, "Switched from temp. frame to frame #%d",
811                             (*f)->number)
812                 }
813         }
814
815         for (i = 0; i < urb->number_of_packets; i++) {
816                 len = urb->iso_frame_desc[i].actual_length;
817                 status = urb->iso_frame_desc[i].status;
818                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
819
820                 if (status && len != 0) {
821                         DBG(4, "URB failed, error in data packet "
822                                "(error #%u, %s)",
823                             status, symbolic(urb_errlist, status))
824                         (*f)->status = F_ERROR;
825                         continue;
826                 }
827
828                 if (len) { /* start of frame */
829
830                         if ((*f)->status == F_UNUSED) {
831                                 (*f)->status = F_GRABBING;
832                                 (*f)->length = 0;
833                         }
834
835                         /* Buffer overflows shouldn't happen, however...*/
836                         if ((*f)->length + len > (*f)->size) {
837                                 DBG(4, "Buffer overflow: bad data packets")
838                                 (*f)->status = F_ERROR;
839                         }
840
841                         if ((*f)->status == F_GRABBING) {
842                                 memcpy((*f)->buffer + (*f)->length, pos, len);
843                                 (*f)->length += len;
844                         }
845
846                 } else if ((*f)->status == F_GRABBING) { /* end of frame */
847
848                         DBG(6, "Frame #%d successfully grabbed", (*f)->number)
849
850                         if (cam->vpp_flag & VPP_DECOMPRESSION) {
851                                 err = w9968cf_vpp->check_headers((*f)->buffer,
852                                                                  (*f)->length);
853                                 if (err) {
854                                         DBG(4, "Skip corrupted frame: %s",
855                                             symbolic(decoder_errlist, err))
856                                         (*f)->status = F_UNUSED;
857                                         continue; /* grab this frame again */
858                                 }
859                         }
860
861                         (*f)->status = F_READY;
862                         (*f)->queued = 0;
863
864                         /* Take a pointer to the new frame from the FIFO list.
865                            If the list is empty,we'll use the temporary frame*/
866                         if (*cam->requested_frame)
867                                 w9968cf_pop_frame(cam, &cam->frame_current);
868                         else {
869                                 cam->frame_current = &cam->frame_tmp;
870                                 (*f)->status = F_UNUSED;
871                         }
872
873                 } else if ((*f)->status == F_ERROR)
874                         (*f)->status = F_UNUSED; /* grab it again */
875
876                 PDBGG("Frame length %lu | pack.#%u | pack.len. %u | state %d",
877                       (unsigned long)(*f)->length, i, len, (*f)->status)
878
879         } /* end for */
880
881         /* Resubmit this URB */
882         urb->dev = cam->usbdev;
883         urb->status = 0;
884         spin_lock(&cam->urb_lock);
885         if (cam->streaming)
886                 if ((err = usb_submit_urb(urb, GFP_ATOMIC))) {
887                         cam->misconfigured = 1;
888                         DBG(1, "Couldn't resubmit the URB: error %d, %s",
889                             err, symbolic(urb_errlist, err))
890                 }
891         spin_unlock(&cam->urb_lock);
892
893         /* Wake up the user process */
894         wake_up_interruptible(&cam->wait_queue);
895 }
896
897
898 /*---------------------------------------------------------------------------
899   Setup the URB structures for the isochronous transfer.
900   Submit the URBs so that the data transfer begins.
901   Return 0 on success, a negative number otherwise.
902   ---------------------------------------------------------------------------*/
903 static int w9968cf_start_transfer(struct w9968cf_device* cam)
904 {
905         struct usb_device *udev = cam->usbdev;
906         struct urb* urb;
907         const u16 p_size = wMaxPacketSize[cam->altsetting-1];
908         u16 w, h, d;
909         int vidcapt;
910         u32 t_size;
911         int err = 0;
912         s8 i, j;
913
914         for (i = 0; i < W9968CF_URBS; i++) {
915                 urb = usb_alloc_urb(W9968CF_ISO_PACKETS, GFP_KERNEL);
916                 cam->urb[i] = urb;
917                 if (!urb) {
918                         for (j = 0; j < i; j++)
919                                 usb_free_urb(cam->urb[j]);
920                         DBG(1, "Couldn't allocate the URB structures")
921                         return -ENOMEM;
922                 }
923
924                 urb->dev = udev;
925                 urb->context = (void*)cam;
926                 urb->pipe = usb_rcvisocpipe(udev, 1);
927                 urb->transfer_flags = URB_ISO_ASAP;
928                 urb->number_of_packets = W9968CF_ISO_PACKETS;
929                 urb->complete = w9968cf_urb_complete;
930                 urb->transfer_buffer = cam->transfer_buffer[i];
931                 urb->transfer_buffer_length = p_size*W9968CF_ISO_PACKETS;
932                 urb->interval = 1;
933                 for (j = 0; j < W9968CF_ISO_PACKETS; j++) {
934                         urb->iso_frame_desc[j].offset = p_size*j;
935                         urb->iso_frame_desc[j].length = p_size;
936                 }
937         }
938
939         /* Transfer size per frame, in WORD ! */
940         d = cam->hw_depth;
941         w = cam->hw_width;
942         h = cam->hw_height;
943
944         t_size = (w*h*d)/16;
945
946         err = w9968cf_write_reg(cam, 0xbf17, 0x00); /* reset everything */
947         err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* normal operation */
948
949         /* Transfer size */
950         err += w9968cf_write_reg(cam, t_size & 0xffff, 0x3d); /* low bits */
951         err += w9968cf_write_reg(cam, t_size >> 16, 0x3e);    /* high bits */
952
953         if (cam->vpp_flag & VPP_DECOMPRESSION)
954                 err += w9968cf_upload_quantizationtables(cam);
955
956         vidcapt = w9968cf_read_reg(cam, 0x16); /* read picture settings */
957         err += w9968cf_write_reg(cam, vidcapt|0x8000, 0x16); /* capt. enable */
958
959         err += usb_set_interface(udev, 0, cam->altsetting);
960         err += w9968cf_write_reg(cam, 0x8a05, 0x3c); /* USB FIFO enable */
961
962         if (err || (vidcapt < 0)) {
963                 for (i = 0; i < W9968CF_URBS; i++)
964                         usb_free_urb(cam->urb[i]);
965                 DBG(1, "Couldn't tell the camera to start the data transfer")
966                 return err;
967         }
968
969         w9968cf_init_framelist(cam);
970
971         /* Begin to grab into the temporary buffer */
972         cam->frame_tmp.status = F_UNUSED;
973         cam->frame_tmp.queued = 0;
974         cam->frame_current = &cam->frame_tmp;
975
976         if (!(cam->vpp_flag & VPP_DECOMPRESSION))
977                 DBG(5, "Isochronous transfer size: %lu bytes/frame",
978                     (unsigned long)t_size*2)
979
980         DBG(5, "Starting the isochronous transfer...")
981
982         cam->streaming = 1;
983
984         /* Submit the URBs */
985         for (i = 0; i < W9968CF_URBS; i++) {
986                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
987                 if (err) {
988                         cam->streaming = 0;
989                         for (j = i-1; j >= 0; j--) {
990                                 usb_kill_urb(cam->urb[j]);
991                                 usb_free_urb(cam->urb[j]);
992                         }
993                         DBG(1, "Couldn't send a transfer request to the "
994                                "USB core (error #%d, %s)", err,
995                             symbolic(urb_errlist, err))
996                         return err;
997                 }
998         }
999
1000         return 0;
1001 }
1002
1003
1004 /*--------------------------------------------------------------------------
1005   Stop the isochronous transfer and set alternate setting to 0 (0Mb/s).
1006   Return 0 on success, a negative number otherwise.
1007   --------------------------------------------------------------------------*/
1008 static int w9968cf_stop_transfer(struct w9968cf_device* cam)
1009 {
1010         struct usb_device *udev = cam->usbdev;
1011         unsigned long lock_flags;
1012         int err = 0;
1013         s8 i;
1014
1015         if (!cam->streaming)
1016                 return 0;
1017
1018         /* This avoids race conditions with usb_submit_urb()
1019            in the URB completition handler */
1020         spin_lock_irqsave(&cam->urb_lock, lock_flags);
1021         cam->streaming = 0;
1022         spin_unlock_irqrestore(&cam->urb_lock, lock_flags);
1023
1024         for (i = W9968CF_URBS-1; i >= 0; i--)
1025                 if (cam->urb[i]) {
1026                         usb_kill_urb(cam->urb[i]);
1027                         usb_free_urb(cam->urb[i]);
1028                         cam->urb[i] = NULL;
1029                 }
1030
1031         if (cam->disconnected)
1032                 goto exit;
1033
1034         err = w9968cf_write_reg(cam, 0x0a05, 0x3c); /* stop USB transfer */
1035         err += usb_set_interface(udev, 0, 0); /* 0 Mb/s */
1036         err += w9968cf_write_reg(cam, 0x0000, 0x39); /* disable JPEG encoder */
1037         err += w9968cf_write_reg(cam, 0x0000, 0x16); /* stop video capture */
1038
1039         if (err) {
1040                 DBG(2, "Failed to tell the camera to stop the isochronous "
1041                        "transfer. However this is not a critical error.")
1042                 return -EIO;
1043         }
1044
1045 exit:
1046         DBG(5, "Isochronous transfer stopped")
1047         return 0;
1048 }
1049
1050
1051 /*--------------------------------------------------------------------------
1052   Write a W9968CF register.
1053   Return 0 on success, -1 otherwise.
1054   --------------------------------------------------------------------------*/
1055 static int w9968cf_write_reg(struct w9968cf_device* cam, u16 value, u16 index)
1056 {
1057         struct usb_device* udev = cam->usbdev;
1058         int res;
1059
1060         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
1061                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
1062                               value, index, NULL, 0, W9968CF_USB_CTRL_TIMEOUT);
1063
1064         if (res < 0)
1065                 DBG(4, "Failed to write a register "
1066                        "(value 0x%04X, index 0x%02X, error #%d, %s)",
1067                     value, index, res, symbolic(urb_errlist, res))
1068
1069         return (res >= 0) ? 0 : -1;
1070 }
1071
1072
1073 /*--------------------------------------------------------------------------
1074   Read a W9968CF register.
1075   Return the register value on success, -1 otherwise.
1076   --------------------------------------------------------------------------*/
1077 static int w9968cf_read_reg(struct w9968cf_device* cam, u16 index)
1078 {
1079         struct usb_device* udev = cam->usbdev;
1080         u16* buff = cam->control_buffer;
1081         int res;
1082
1083         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 1,
1084                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
1085                               0, index, buff, 2, W9968CF_USB_CTRL_TIMEOUT);
1086
1087         if (res < 0)
1088                 DBG(4, "Failed to read a register "
1089                        "(index 0x%02X, error #%d, %s)",
1090                     index, res, symbolic(urb_errlist, res))
1091
1092         return (res >= 0) ? (int)(*buff) : -1;
1093 }
1094
1095
1096 /*--------------------------------------------------------------------------
1097   Write 64-bit data to the fast serial bus registers.
1098   Return 0 on success, -1 otherwise.
1099   --------------------------------------------------------------------------*/
1100 static int w9968cf_write_fsb(struct w9968cf_device* cam, u16* data)
1101 {
1102         struct usb_device* udev = cam->usbdev;
1103         u16 value;
1104         int res;
1105
1106         value = *data++;
1107
1108         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0,
1109                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
1110                               value, 0x06, data, 6, W9968CF_USB_CTRL_TIMEOUT);
1111
1112         if (res < 0)
1113                 DBG(4, "Failed to write the FSB registers "
1114                        "(error #%d, %s)", res, symbolic(urb_errlist, res))
1115
1116         return (res >= 0) ? 0 : -1;
1117 }
1118
1119
1120 /*--------------------------------------------------------------------------
1121   Write data to the serial bus control register.
1122   Return 0 on success, a negative number otherwise.
1123   --------------------------------------------------------------------------*/
1124 static int w9968cf_write_sb(struct w9968cf_device* cam, u16 value)
1125 {
1126         int err = 0;
1127
1128         err = w9968cf_write_reg(cam, value, 0x01);
1129         udelay(W9968CF_I2C_BUS_DELAY);
1130
1131         return err;
1132 }
1133
1134
1135 /*--------------------------------------------------------------------------
1136   Read data from the serial bus control register.
1137   Return 0 on success, a negative number otherwise.
1138   --------------------------------------------------------------------------*/
1139 static int w9968cf_read_sb(struct w9968cf_device* cam)
1140 {
1141         int v = 0;
1142
1143         v = w9968cf_read_reg(cam, 0x01);
1144         udelay(W9968CF_I2C_BUS_DELAY);
1145
1146         return v;
1147 }
1148
1149
1150 /*--------------------------------------------------------------------------
1151   Upload quantization tables for the JPEG compression.
1152   This function is called by w9968cf_start_transfer().
1153   Return 0 on success, a negative number otherwise.
1154   --------------------------------------------------------------------------*/
1155 static int w9968cf_upload_quantizationtables(struct w9968cf_device* cam)
1156 {
1157         u16 a, b;
1158         int err = 0, i, j;
1159
1160         err += w9968cf_write_reg(cam, 0x0010, 0x39); /* JPEG clock enable */
1161
1162         for (i = 0, j = 0; i < 32; i++, j += 2) {
1163                 a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j+1]) << 8);
1164                 b = UV_QUANTABLE[j] | ((unsigned)(UV_QUANTABLE[j+1]) << 8);
1165                 err += w9968cf_write_reg(cam, a, 0x40+i);
1166                 err += w9968cf_write_reg(cam, b, 0x60+i);
1167         }
1168         err += w9968cf_write_reg(cam, 0x0012, 0x39); /* JPEG encoder enable */
1169
1170         return err;
1171 }
1172
1173
1174
1175 /****************************************************************************
1176  * Low-level I2C I/O functions.                                             *
1177  * The adapter supports the following I2C transfer functions:               *
1178  * i2c_adap_fastwrite_byte_data() (at 400 kHz bit frequency only)           *
1179  * i2c_adap_read_byte_data()                                                *
1180  * i2c_adap_read_byte()                                                     *
1181  ****************************************************************************/
1182
1183 static int w9968cf_smbus_start(struct w9968cf_device* cam)
1184 {
1185         int err = 0;
1186
1187         err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
1188         err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
1189
1190         return err;
1191 }
1192
1193
1194 static int w9968cf_smbus_stop(struct w9968cf_device* cam)
1195 {
1196         int err = 0;
1197
1198         err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
1199         err += w9968cf_write_sb(cam, 0x0013); /* SDE=1, SDA=1, SCL=1 */
1200
1201         return err;
1202 }
1203
1204
1205 static int w9968cf_smbus_write_byte(struct w9968cf_device* cam, u8 v)
1206 {
1207         u8 bit;
1208         int err = 0, sda;
1209
1210         for (bit = 0 ; bit < 8 ; bit++) {
1211                 sda = (v & 0x80) ? 2 : 0;
1212                 v <<= 1;
1213                 /* SDE=1, SDA=sda, SCL=0 */
1214                 err += w9968cf_write_sb(cam, 0x10 | sda);
1215                 /* SDE=1, SDA=sda, SCL=1 */
1216                 err += w9968cf_write_sb(cam, 0x11 | sda);
1217                 /* SDE=1, SDA=sda, SCL=0 */
1218                 err += w9968cf_write_sb(cam, 0x10 | sda);
1219         }
1220
1221         return err;
1222 }
1223
1224
1225 static int w9968cf_smbus_read_byte(struct w9968cf_device* cam, u8* v)
1226 {
1227         u8 bit;
1228         int err = 0;
1229
1230         *v = 0;
1231         for (bit = 0 ; bit < 8 ; bit++) {
1232                 *v <<= 1;
1233                 err += w9968cf_write_sb(cam, 0x0013);
1234                 *v |= (w9968cf_read_sb(cam) & 0x0008) ? 1 : 0;
1235                 err += w9968cf_write_sb(cam, 0x0012);
1236         }
1237
1238         return err;
1239 }
1240
1241
1242 static int w9968cf_smbus_write_ack(struct w9968cf_device* cam)
1243 {
1244         int err = 0;
1245
1246         err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
1247         err += w9968cf_write_sb(cam, 0x0011); /* SDE=1, SDA=0, SCL=1 */
1248         err += w9968cf_write_sb(cam, 0x0010); /* SDE=1, SDA=0, SCL=0 */
1249
1250         return err;
1251 }
1252
1253
1254 static int w9968cf_smbus_read_ack(struct w9968cf_device* cam)
1255 {
1256         int err = 0, sda;
1257
1258         err += w9968cf_write_sb(cam, 0x0013); /* SDE=1, SDA=1, SCL=1 */
1259         sda = (w9968cf_read_sb(cam) & 0x08) ? 1 : 0; /* sda = SDA */
1260         err += w9968cf_write_sb(cam, 0x0012); /* SDE=1, SDA=1, SCL=0 */
1261         if (sda < 0)
1262                 err += sda;
1263         if (sda == 1) {
1264                 DBG(6, "Couldn't receive the ACK")
1265                 err += -1;
1266         }
1267
1268         return err;
1269 }
1270
1271
1272 /* This seems to refresh the communication through the serial bus */
1273 static int w9968cf_smbus_refresh_bus(struct w9968cf_device* cam)
1274 {
1275         int err = 0, j;
1276
1277         for (j = 1; j <= 10; j++) {
1278                 err = w9968cf_write_reg(cam, 0x0020, 0x01);
1279                 err += w9968cf_write_reg(cam, 0x0000, 0x01);
1280                 if (err)
1281                         break;
1282         }
1283
1284         return err;
1285 }
1286
1287
1288 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
1289 static int
1290 w9968cf_i2c_adap_fastwrite_byte_data(struct w9968cf_device* cam,
1291                                      u16 address, u8 subaddress,u8 value)
1292 {
1293         u16* data = cam->data_buffer;
1294         int err = 0;
1295
1296         err += w9968cf_smbus_refresh_bus(cam);
1297
1298         /* Enable SBUS outputs */
1299         err += w9968cf_write_sb(cam, 0x0020);
1300
1301         data[0] = 0x082f | ((address & 0x80) ? 0x1500 : 0x0);
1302         data[0] |= (address & 0x40) ? 0x4000 : 0x0;
1303         data[1] = 0x2082 | ((address & 0x40) ? 0x0005 : 0x0);
1304         data[1] |= (address & 0x20) ? 0x0150 : 0x0;
1305         data[1] |= (address & 0x10) ? 0x5400 : 0x0;
1306         data[2] = 0x8208 | ((address & 0x08) ? 0x0015 : 0x0);
1307         data[2] |= (address & 0x04) ? 0x0540 : 0x0;
1308         data[2] |= (address & 0x02) ? 0x5000 : 0x0;
1309         data[3] = 0x1d20 | ((address & 0x02) ? 0x0001 : 0x0);
1310         data[3] |= (address & 0x01) ? 0x0054 : 0x0;
1311
1312         err += w9968cf_write_fsb(cam, data);
1313
1314         data[0] = 0x8208 | ((subaddress & 0x80) ? 0x0015 : 0x0);
1315         data[0] |= (subaddress & 0x40) ? 0x0540 : 0x0;
1316         data[0] |= (subaddress & 0x20) ? 0x5000 : 0x0;
1317         data[1] = 0x0820 | ((subaddress & 0x20) ? 0x0001 : 0x0);
1318         data[1] |= (subaddress & 0x10) ? 0x0054 : 0x0;
1319         data[1] |= (subaddress & 0x08) ? 0x1500 : 0x0;
1320         data[1] |= (subaddress & 0x04) ? 0x4000 : 0x0;
1321         data[2] = 0x2082 | ((subaddress & 0x04) ? 0x0005 : 0x0);
1322         data[2] |= (subaddress & 0x02) ? 0x0150 : 0x0;
1323         data[2] |= (subaddress & 0x01) ? 0x5400 : 0x0;
1324         data[3] = 0x001d;
1325
1326         err += w9968cf_write_fsb(cam, data);
1327
1328         data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
1329         data[0] |= (value & 0x40) ? 0x0540 : 0x0;
1330         data[0] |= (value & 0x20) ? 0x5000 : 0x0;
1331         data[1] = 0x0820 | ((value & 0x20) ? 0x0001 : 0x0);
1332         data[1] |= (value & 0x10) ? 0x0054 : 0x0;
1333         data[1] |= (value & 0x08) ? 0x1500 : 0x0;
1334         data[1] |= (value & 0x04) ? 0x4000 : 0x0;
1335         data[2] = 0x2082 | ((value & 0x04) ? 0x0005 : 0x0);
1336         data[2] |= (value & 0x02) ? 0x0150 : 0x0;
1337         data[2] |= (value & 0x01) ? 0x5400 : 0x0;
1338         data[3] = 0xfe1d;
1339
1340         err += w9968cf_write_fsb(cam, data);
1341
1342         /* Disable SBUS outputs */
1343         err += w9968cf_write_sb(cam, 0x0000);
1344
1345         if (!err)
1346                 DBG(5, "I2C write byte data done, addr.0x%04X, subaddr.0x%02X "
1347                        "value 0x%02X", address, subaddress, value)
1348         else
1349                 DBG(5, "I2C write byte data failed, addr.0x%04X, "
1350                        "subaddr.0x%02X, value 0x%02X",
1351                     address, subaddress, value)
1352
1353         return err;
1354 }
1355
1356
1357 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
1358 static int
1359 w9968cf_i2c_adap_read_byte_data(struct w9968cf_device* cam,
1360                                 u16 address, u8 subaddress,
1361                                 u8* value)
1362 {
1363         int err = 0;
1364
1365         /* Serial data enable */
1366         err += w9968cf_write_sb(cam, 0x0013); /* don't change ! */
1367
1368         err += w9968cf_smbus_start(cam);
1369         err += w9968cf_smbus_write_byte(cam, address);
1370         err += w9968cf_smbus_read_ack(cam);
1371         err += w9968cf_smbus_write_byte(cam, subaddress);
1372         err += w9968cf_smbus_read_ack(cam);
1373         err += w9968cf_smbus_stop(cam);
1374         err += w9968cf_smbus_start(cam);
1375         err += w9968cf_smbus_write_byte(cam, address + 1);
1376         err += w9968cf_smbus_read_ack(cam);
1377         err += w9968cf_smbus_read_byte(cam, value);
1378         err += w9968cf_smbus_write_ack(cam);
1379         err += w9968cf_smbus_stop(cam);
1380
1381         /* Serial data disable */
1382         err += w9968cf_write_sb(cam, 0x0000);
1383
1384         if (!err)
1385                 DBG(5, "I2C read byte data done, addr.0x%04X, "
1386                        "subaddr.0x%02X, value 0x%02X",
1387                     address, subaddress, *value)
1388         else
1389                 DBG(5, "I2C read byte data failed, addr.0x%04X, "
1390                        "subaddr.0x%02X, wrong value 0x%02X",
1391                     address, subaddress, *value)
1392
1393         return err;
1394 }
1395
1396
1397 /* SMBus protocol: S Addr+1 Rd [A] [Value] NA P */
1398 static int
1399 w9968cf_i2c_adap_read_byte(struct w9968cf_device* cam,
1400                            u16 address, u8* value)
1401 {
1402         int err = 0;
1403
1404         /* Serial data enable */
1405         err += w9968cf_write_sb(cam, 0x0013);
1406
1407         err += w9968cf_smbus_start(cam);
1408         err += w9968cf_smbus_write_byte(cam, address + 1);
1409         err += w9968cf_smbus_read_ack(cam);
1410         err += w9968cf_smbus_read_byte(cam, value);
1411         err += w9968cf_smbus_write_ack(cam);
1412         err += w9968cf_smbus_stop(cam);
1413
1414         /* Serial data disable */
1415         err += w9968cf_write_sb(cam, 0x0000);
1416
1417         if (!err)
1418                 DBG(5, "I2C read byte done, addr.0x%04X, "
1419                        "value 0x%02X", address, *value)
1420         else
1421                 DBG(5, "I2C read byte failed, addr.0x%04X, "
1422                        "wrong value 0x%02X", address, *value)
1423
1424         return err;
1425 }
1426
1427
1428 /* SMBus protocol: S Addr Wr [A] Value [A] P */
1429 static int
1430 w9968cf_i2c_adap_write_byte(struct w9968cf_device* cam,
1431                             u16 address, u8 value)
1432 {
1433         DBG(4, "i2c_write_byte() is an unsupported transfer mode")
1434         return -EINVAL;
1435 }
1436
1437
1438
1439 /****************************************************************************
1440  * I2C interface to kernel                                                  *
1441  ****************************************************************************/
1442
1443 static int
1444 w9968cf_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
1445                        unsigned short flags, char read_write, u8 command,
1446                        int size, union i2c_smbus_data *data)
1447 {
1448         struct w9968cf_device* cam = i2c_get_adapdata(adapter);
1449         u8 i;
1450         int err = 0;
1451
1452         switch (addr) {
1453                 case OV6xx0_SID:
1454                 case OV7xx0_SID:
1455                         break;
1456                 default:
1457                         DBG(4, "Rejected slave ID 0x%04X", addr)
1458                         return -EINVAL;
1459         }
1460
1461         if (size == I2C_SMBUS_BYTE) {
1462                 /* Why addr <<= 1? See OVXXX0_SID defines in ovcamchip.h */
1463                 addr <<= 1;
1464
1465                 if (read_write == I2C_SMBUS_WRITE)
1466                         err = w9968cf_i2c_adap_write_byte(cam, addr, command);
1467                 else if (read_write == I2C_SMBUS_READ)
1468                         err = w9968cf_i2c_adap_read_byte(cam,addr,&data->byte);
1469
1470         } else if (size == I2C_SMBUS_BYTE_DATA) {
1471                 addr <<= 1;
1472
1473                 if (read_write == I2C_SMBUS_WRITE)
1474                         err = w9968cf_i2c_adap_fastwrite_byte_data(cam, addr,
1475                                                           command, data->byte);
1476                 else if (read_write == I2C_SMBUS_READ) {
1477                         for (i = 1; i <= W9968CF_I2C_RW_RETRIES; i++) {
1478                                 err = w9968cf_i2c_adap_read_byte_data(cam,addr,
1479                                                          command, &data->byte);
1480                                 if (err) {
1481                                         if (w9968cf_smbus_refresh_bus(cam)) {
1482                                                 err = -EIO;
1483                                                 break;
1484                                         }
1485                                 } else
1486                                         break;
1487                         }
1488
1489                 } else
1490                         return -EINVAL;
1491
1492         } else {
1493                 DBG(4, "Unsupported I2C transfer mode (%d)", size)
1494                 return -EINVAL;
1495         }
1496
1497         return err;
1498 }
1499
1500
1501 static u32 w9968cf_i2c_func(struct i2c_adapter* adap)
1502 {
1503         return I2C_FUNC_SMBUS_READ_BYTE |
1504                I2C_FUNC_SMBUS_READ_BYTE_DATA  |
1505                I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
1506 }
1507
1508
1509 static int w9968cf_i2c_attach_inform(struct i2c_client* client)
1510 {
1511         struct w9968cf_device* cam = i2c_get_adapdata(client->adapter);
1512         int id = client->driver->id, err = 0;
1513
1514         if (id == I2C_DRIVERID_OVCAMCHIP) {
1515                 cam->sensor_client = client;
1516                 err = w9968cf_sensor_init(cam);
1517                 if (err) {
1518                         cam->sensor_client = NULL;
1519                         return err;
1520                 }
1521         } else {
1522                 DBG(4, "Rejected client [%s] with driver [%s]",
1523                     client->name, client->driver->driver.name)
1524                 return -EINVAL;
1525         }
1526
1527         DBG(5, "I2C attach client [%s] with driver [%s]",
1528             client->name, client->driver->driver.name)
1529
1530         return 0;
1531 }
1532
1533
1534 static int w9968cf_i2c_detach_inform(struct i2c_client* client)
1535 {
1536         struct w9968cf_device* cam = i2c_get_adapdata(client->adapter);
1537
1538         if (cam->sensor_client == client)
1539                 cam->sensor_client = NULL;
1540
1541         DBG(5, "I2C detach client [%s]", client->name)
1542
1543         return 0;
1544 }
1545
1546
1547 static int
1548 w9968cf_i2c_control(struct i2c_adapter* adapter, unsigned int cmd,
1549                     unsigned long arg)
1550 {
1551         return 0;
1552 }
1553
1554
1555 static int w9968cf_i2c_init(struct w9968cf_device* cam)
1556 {
1557         int err = 0;
1558
1559         static struct i2c_algorithm algo = {
1560                 .smbus_xfer =    w9968cf_i2c_smbus_xfer,
1561                 .algo_control =  w9968cf_i2c_control,
1562                 .functionality = w9968cf_i2c_func,
1563         };
1564
1565         static struct i2c_adapter adap = {
1566                 .id =                I2C_HW_SMBUS_W9968CF,
1567                 .class =             I2C_CLASS_CAM_DIGITAL,
1568                 .owner =             THIS_MODULE,
1569                 .client_register =   w9968cf_i2c_attach_inform,
1570                 .client_unregister = w9968cf_i2c_detach_inform,
1571                 .algo =              &algo,
1572         };
1573
1574         memcpy(&cam->i2c_adapter, &adap, sizeof(struct i2c_adapter));
1575         strcpy(cam->i2c_adapter.name, "w9968cf");
1576         i2c_set_adapdata(&cam->i2c_adapter, cam);
1577
1578         DBG(6, "Registering I2C adapter with kernel...")
1579
1580         err = i2c_add_adapter(&cam->i2c_adapter);
1581         if (err)
1582                 DBG(1, "Failed to register the I2C adapter")
1583         else
1584                 DBG(5, "I2C adapter registered")
1585
1586         return err;
1587 }
1588
1589
1590
1591 /****************************************************************************
1592  * Helper functions                                                         *
1593  ****************************************************************************/
1594
1595 /*--------------------------------------------------------------------------
1596   Turn on the LED on some webcams. A beep should be heard too.
1597   Return 0 on success, a negative number otherwise.
1598   --------------------------------------------------------------------------*/
1599 static int w9968cf_turn_on_led(struct w9968cf_device* cam)
1600 {
1601         int err = 0;
1602
1603         err += w9968cf_write_reg(cam, 0xff00, 0x00); /* power-down */
1604         err += w9968cf_write_reg(cam, 0xbf17, 0x00); /* reset everything */
1605         err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* normal operation */
1606         err += w9968cf_write_reg(cam, 0x0010, 0x01); /* serial bus, SDS high */
1607         err += w9968cf_write_reg(cam, 0x0000, 0x01); /* serial bus, SDS low */
1608         err += w9968cf_write_reg(cam, 0x0010, 0x01); /* ..high 'beep-beep' */
1609
1610         if (err)
1611                 DBG(2, "Couldn't turn on the LED")
1612
1613         DBG(5, "LED turned on")
1614
1615         return err;
1616 }
1617
1618
1619 /*--------------------------------------------------------------------------
1620   Write some registers for the device initialization.
1621   This function is called once on open().
1622   Return 0 on success, a negative number otherwise.
1623   --------------------------------------------------------------------------*/
1624 static int w9968cf_init_chip(struct w9968cf_device* cam)
1625 {
1626         unsigned long hw_bufsize = cam->maxwidth*cam->maxheight*2,
1627                       y0 = 0x0000,
1628                       u0 = y0 + hw_bufsize/2,
1629                       v0 = u0 + hw_bufsize/4,
1630                       y1 = v0 + hw_bufsize/4,
1631                       u1 = y1 + hw_bufsize/2,
1632                       v1 = u1 + hw_bufsize/4;
1633         int err = 0;
1634
1635         err += w9968cf_write_reg(cam, 0xff00, 0x00); /* power off */
1636         err += w9968cf_write_reg(cam, 0xbf10, 0x00); /* power on */
1637
1638         err += w9968cf_write_reg(cam, 0x405d, 0x03); /* DRAM timings */
1639         err += w9968cf_write_reg(cam, 0x0030, 0x04); /* SDRAM timings */
1640
1641         err += w9968cf_write_reg(cam, y0 & 0xffff, 0x20); /* Y buf.0, low */
1642         err += w9968cf_write_reg(cam, y0 >> 16, 0x21);    /* Y buf.0, high */
1643         err += w9968cf_write_reg(cam, u0 & 0xffff, 0x24); /* U buf.0, low */
1644         err += w9968cf_write_reg(cam, u0 >> 16, 0x25);    /* U buf.0, high */
1645         err += w9968cf_write_reg(cam, v0 & 0xffff, 0x28); /* V buf.0, low */
1646         err += w9968cf_write_reg(cam, v0 >> 16, 0x29);    /* V buf.0, high */
1647
1648         err += w9968cf_write_reg(cam, y1 & 0xffff, 0x22); /* Y buf.1, low */
1649         err += w9968cf_write_reg(cam, y1 >> 16, 0x23);    /* Y buf.1, high */
1650         err += w9968cf_write_reg(cam, u1 & 0xffff, 0x26); /* U buf.1, low */
1651         err += w9968cf_write_reg(cam, u1 >> 16, 0x27);    /* U buf.1, high */
1652         err += w9968cf_write_reg(cam, v1 & 0xffff, 0x2a); /* V buf.1, low */
1653         err += w9968cf_write_reg(cam, v1 >> 16, 0x2b);    /* V buf.1, high */
1654
1655         err += w9968cf_write_reg(cam, y1 & 0xffff, 0x32); /* JPEG buf 0 low */
1656         err += w9968cf_write_reg(cam, y1 >> 16, 0x33);    /* JPEG buf 0 high */
1657
1658         err += w9968cf_write_reg(cam, y1 & 0xffff, 0x34); /* JPEG buf 1 low */
1659         err += w9968cf_write_reg(cam, y1 >> 16, 0x35);    /* JPEG bug 1 high */
1660
1661         err += w9968cf_write_reg(cam, 0x0000, 0x36);/* JPEG restart interval */
1662         err += w9968cf_write_reg(cam, 0x0804, 0x37);/*JPEG VLE FIFO threshold*/
1663         err += w9968cf_write_reg(cam, 0x0000, 0x38);/* disable hw up-scaling */
1664         err += w9968cf_write_reg(cam, 0x0000, 0x3f); /* JPEG/MCTL test data */
1665
1666         err += w9968cf_set_picture(cam, cam->picture); /* this before */
1667         err += w9968cf_set_window(cam, cam->window);
1668
1669         if (err)
1670                 DBG(1, "Chip initialization failed")
1671         else
1672                 DBG(5, "Chip successfully initialized")
1673
1674         return err;
1675 }
1676
1677
1678 /*--------------------------------------------------------------------------
1679   Return non-zero if the palette is supported, 0 otherwise.
1680   --------------------------------------------------------------------------*/
1681 static inline u16 w9968cf_valid_palette(u16 palette)
1682 {
1683         u8 i = 0;
1684         while (w9968cf_formatlist[i].palette != 0) {
1685                 if (palette == w9968cf_formatlist[i].palette)
1686                         return palette;
1687                 i++;
1688         }
1689         return 0;
1690 }
1691
1692
1693 /*--------------------------------------------------------------------------
1694   Return the depth corresponding to the given palette.
1695   Palette _must_ be supported !
1696   --------------------------------------------------------------------------*/
1697 static inline u16 w9968cf_valid_depth(u16 palette)
1698 {
1699         u8 i=0;
1700         while (w9968cf_formatlist[i].palette != palette)
1701                 i++;
1702
1703         return w9968cf_formatlist[i].depth;
1704 }
1705
1706
1707 /*--------------------------------------------------------------------------
1708   Return non-zero if the format requires decompression, 0 otherwise.
1709   --------------------------------------------------------------------------*/
1710 static inline u8 w9968cf_need_decompression(u16 palette)
1711 {
1712         u8 i = 0;
1713         while (w9968cf_formatlist[i].palette != 0) {
1714                 if (palette == w9968cf_formatlist[i].palette)
1715                         return w9968cf_formatlist[i].compression;
1716                 i++;
1717         }
1718         return 0;
1719 }
1720
1721
1722 /*--------------------------------------------------------------------------
1723   Change the picture settings of the camera.
1724   Return 0 on success, a negative number otherwise.
1725   --------------------------------------------------------------------------*/
1726 static int
1727 w9968cf_set_picture(struct w9968cf_device* cam, struct video_picture pict)
1728 {
1729         u16 fmt, hw_depth, hw_palette, reg_v = 0x0000;
1730         int err = 0;
1731
1732         /* Make sure we are using a valid depth */
1733         pict.depth = w9968cf_valid_depth(pict.palette);
1734
1735         fmt = pict.palette;
1736
1737         hw_depth = pict.depth; /* depth used by the winbond chip */
1738         hw_palette = pict.palette; /* palette used by the winbond chip */
1739
1740         /* VS & HS polarities */
1741         reg_v = (cam->vs_polarity << 12) | (cam->hs_polarity << 11);
1742
1743         switch (fmt)
1744         {
1745                 case VIDEO_PALETTE_UYVY:
1746                         reg_v |= 0x0000;
1747                         cam->vpp_flag = VPP_NONE;
1748                         break;
1749                 case VIDEO_PALETTE_YUV422P:
1750                         reg_v |= 0x0002;
1751                         cam->vpp_flag = VPP_DECOMPRESSION;
1752                         break;
1753                 case VIDEO_PALETTE_YUV420:
1754                 case VIDEO_PALETTE_YUV420P:
1755                         reg_v |= 0x0003;
1756                         cam->vpp_flag = VPP_DECOMPRESSION;
1757                         break;
1758                 case VIDEO_PALETTE_YUYV:
1759                 case VIDEO_PALETTE_YUV422:
1760                         reg_v |= 0x0000;
1761                         cam->vpp_flag = VPP_SWAP_YUV_BYTES;
1762                         hw_palette = VIDEO_PALETTE_UYVY;
1763                         break;
1764                 /* Original video is used instead of RGBX palettes.
1765                    Software conversion later. */
1766                 case VIDEO_PALETTE_GREY:
1767                 case VIDEO_PALETTE_RGB555:
1768                 case VIDEO_PALETTE_RGB565:
1769                 case VIDEO_PALETTE_RGB24:
1770                 case VIDEO_PALETTE_RGB32:
1771                         reg_v |= 0x0000; /* UYVY 16 bit is used */
1772                         hw_depth = 16;
1773                         hw_palette = VIDEO_PALETTE_UYVY;
1774                         cam->vpp_flag = VPP_UYVY_TO_RGBX;
1775                         break;
1776         }
1777
1778         /* NOTE: due to memory issues, it is better to disable the hardware
1779                  double buffering during compression */
1780         if (cam->double_buffer && !(cam->vpp_flag & VPP_DECOMPRESSION))
1781                 reg_v |= 0x0080;
1782
1783         if (cam->clamping)
1784                 reg_v |= 0x0020;
1785
1786         if (cam->filter_type == 1)
1787                 reg_v |= 0x0008;
1788         else if (cam->filter_type == 2)
1789                 reg_v |= 0x000c;
1790
1791         if ((err = w9968cf_write_reg(cam, reg_v, 0x16)))
1792                 goto error;
1793
1794         if ((err = w9968cf_sensor_update_picture(cam, pict)))
1795                 goto error;
1796
1797         /* If all went well, update the device data structure */
1798         memcpy(&cam->picture, &pict, sizeof(pict));
1799         cam->hw_depth = hw_depth;
1800         cam->hw_palette = hw_palette;
1801
1802         /* Settings changed, so we clear the frame buffers */
1803         memset(cam->frame[0].buffer, 0, cam->nbuffers*cam->frame[0].size);
1804
1805         DBG(4, "Palette is %s, depth is %u bpp",
1806             symbolic(v4l1_plist, pict.palette), pict.depth)
1807
1808         return 0;
1809
1810 error:
1811         DBG(1, "Failed to change picture settings")
1812         return err;
1813 }
1814
1815
1816 /*--------------------------------------------------------------------------
1817   Change the capture area size of the camera.
1818   This function _must_ be called _after_ w9968cf_set_picture().
1819   Return 0 on success, a negative number otherwise.
1820   --------------------------------------------------------------------------*/
1821 static int
1822 w9968cf_set_window(struct w9968cf_device* cam, struct video_window win)
1823 {
1824         u16 x, y, w, h, scx, scy, cw, ch, ax, ay;
1825         unsigned long fw, fh;
1826         struct ovcamchip_window s_win;
1827         int err = 0;
1828
1829         /* Work around to avoid FP arithmetics */
1830         #define __SC(x) ((x) << 10)
1831         #define __UNSC(x) ((x) >> 10)
1832
1833         /* Make sure we are using a supported resolution */
1834         if ((err = w9968cf_adjust_window_size(cam, (u16*)&win.width,
1835                                               (u16*)&win.height)))
1836                 goto error;
1837
1838         /* Scaling factors */
1839         fw = __SC(win.width) / cam->maxwidth;
1840         fh = __SC(win.height) / cam->maxheight;
1841
1842         /* Set up the width and height values used by the chip */
1843         if ((win.width > cam->maxwidth) || (win.height > cam->maxheight)) {
1844                 cam->vpp_flag |= VPP_UPSCALE;
1845                 /* Calculate largest w,h mantaining the same w/h ratio */
1846                 w = (fw >= fh) ? cam->maxwidth : __SC(win.width)/fh;
1847                 h = (fw >= fh) ? __SC(win.height)/fw : cam->maxheight;
1848                 if (w < cam->minwidth) /* just in case */
1849                         w = cam->minwidth;
1850                 if (h < cam->minheight) /* just in case */
1851                         h = cam->minheight;
1852         } else {
1853                 cam->vpp_flag &= ~VPP_UPSCALE;
1854                 w = win.width;
1855                 h = win.height;
1856         }
1857
1858         /* x,y offsets of the cropped area */
1859         scx = cam->start_cropx;
1860         scy = cam->start_cropy;
1861
1862         /* Calculate cropped area manteining the right w/h ratio */
1863         if (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE)) {
1864                 cw = (fw >= fh) ? cam->maxwidth : __SC(win.width)/fh;
1865                 ch = (fw >= fh) ? __SC(win.height)/fw : cam->maxheight;
1866         } else {
1867                 cw = w;
1868                 ch = h;
1869         }
1870
1871         /* Setup the window of the sensor */
1872         s_win.format = VIDEO_PALETTE_UYVY;
1873         s_win.width = cam->maxwidth;
1874         s_win.height = cam->maxheight;
1875         s_win.quarter = 0; /* full progressive video */
1876
1877         /* Center it */
1878         s_win.x = (s_win.width - cw) / 2;
1879         s_win.y = (s_win.height - ch) / 2;
1880
1881         /* Clock divisor */
1882         if (cam->clockdiv >= 0)
1883                 s_win.clockdiv = cam->clockdiv; /* manual override */
1884         else
1885                 switch (cam->sensor) {
1886                         case CC_OV6620:
1887                                 s_win.clockdiv = 0;
1888                                 break;
1889                         case CC_OV6630:
1890                                 s_win.clockdiv = 0;
1891                                 break;
1892                         case CC_OV76BE:
1893                         case CC_OV7610:
1894                         case CC_OV7620:
1895                                 s_win.clockdiv = 0;
1896                                 break;
1897                         default:
1898                                 s_win.clockdiv = W9968CF_DEF_CLOCKDIVISOR;
1899                 }
1900
1901         /* We have to scale win.x and win.y offsets */
1902         if ( (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE))
1903              || (cam->vpp_flag & VPP_UPSCALE) ) {
1904                 ax = __SC(win.x)/fw;
1905                 ay = __SC(win.y)/fh;
1906         } else {
1907                 ax = win.x;
1908                 ay = win.y;
1909         }
1910
1911         if ((ax + cw) > cam->maxwidth)
1912                 ax = cam->maxwidth - cw;
1913
1914         if ((ay + ch) > cam->maxheight)
1915                 ay = cam->maxheight - ch;
1916
1917         /* Adjust win.x, win.y */
1918         if ( (cam->largeview && !(cam->vpp_flag & VPP_UPSCALE))
1919              || (cam->vpp_flag & VPP_UPSCALE) ) {
1920                 win.x = __UNSC(ax*fw);
1921                 win.y = __UNSC(ay*fh);
1922         } else {
1923                 win.x = ax;
1924                 win.y = ay;
1925         }
1926
1927         /* Offsets used by the chip */
1928         x = ax + s_win.x;
1929         y = ay + s_win.y;
1930
1931         /* Go ! */
1932         if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_S_MODE, &s_win)))
1933                 goto error;
1934
1935         err += w9968cf_write_reg(cam, scx + x, 0x10);
1936         err += w9968cf_write_reg(cam, scy + y, 0x11);
1937         err += w9968cf_write_reg(cam, scx + x + cw, 0x12);
1938         err += w9968cf_write_reg(cam, scy + y + ch, 0x13);
1939         err += w9968cf_write_reg(cam, w, 0x14);
1940         err += w9968cf_write_reg(cam, h, 0x15);
1941
1942         /* JPEG width & height */
1943         err += w9968cf_write_reg(cam, w, 0x30);
1944         err += w9968cf_write_reg(cam, h, 0x31);
1945
1946         /* Y & UV frame buffer strides (in WORD) */
1947         if (cam->vpp_flag & VPP_DECOMPRESSION) {
1948                 err += w9968cf_write_reg(cam, w/2, 0x2c);
1949                 err += w9968cf_write_reg(cam, w/4, 0x2d);
1950         } else
1951                 err += w9968cf_write_reg(cam, w, 0x2c);
1952
1953         if (err)
1954                 goto error;
1955
1956         /* If all went well, update the device data structure */
1957         memcpy(&cam->window, &win, sizeof(win));
1958         cam->hw_width = w;
1959         cam->hw_height = h;
1960
1961         /* Settings changed, so we clear the frame buffers */
1962         memset(cam->frame[0].buffer, 0, cam->nbuffers*cam->frame[0].size);
1963
1964         DBG(4, "The capture area is %dx%d, Offset (x,y)=(%u,%u)",
1965             win.width, win.height, win.x, win.y)
1966
1967         PDBGG("x=%u ,y=%u, w=%u, h=%u, ax=%u, ay=%u, s_win.x=%u, s_win.y=%u, "
1968               "cw=%u, ch=%u, win.x=%u, win.y=%u, win.width=%u, win.height=%u",
1969               x, y, w, h, ax, ay, s_win.x, s_win.y, cw, ch, win.x, win.y,
1970               win.width, win.height)
1971
1972         return 0;
1973
1974 error:
1975         DBG(1, "Failed to change the capture area size")
1976         return err;
1977 }
1978
1979
1980 /*--------------------------------------------------------------------------
1981   Adjust the asked values for window width and height.
1982   Return 0 on success, -1 otherwise.
1983   --------------------------------------------------------------------------*/
1984 static int
1985 w9968cf_adjust_window_size(struct w9968cf_device* cam, u16* width, u16* height)
1986 {
1987         u16 maxw, maxh;
1988
1989         if ((*width < cam->minwidth) || (*height < cam->minheight))
1990                 return -ERANGE;
1991
1992         maxw = cam->upscaling && !(cam->vpp_flag & VPP_DECOMPRESSION) &&
1993                w9968cf_vpp ? max((u16)W9968CF_MAX_WIDTH, cam->maxwidth)
1994                            : cam->maxwidth;
1995         maxh = cam->upscaling && !(cam->vpp_flag & VPP_DECOMPRESSION) &&
1996                w9968cf_vpp ? max((u16)W9968CF_MAX_HEIGHT, cam->maxheight)
1997                            : cam->maxheight;
1998
1999         if (*width > maxw)
2000                 *width = maxw;
2001         if (*height > maxh)
2002                 *height = maxh;
2003
2004         if (cam->vpp_flag & VPP_DECOMPRESSION) {
2005                 *width  &= ~15L; /* multiple of 16 */
2006                 *height &= ~15L;
2007         }
2008
2009         PDBGG("Window size adjusted w=%u, h=%u ", *width, *height)
2010
2011         return 0;
2012 }
2013
2014
2015 /*--------------------------------------------------------------------------
2016   Initialize the FIFO list of requested frames.
2017   --------------------------------------------------------------------------*/
2018 static void w9968cf_init_framelist(struct w9968cf_device* cam)
2019 {
2020         u8 i;
2021
2022         for (i = 0; i < cam->nbuffers; i++) {
2023                 cam->requested_frame[i] = NULL;
2024                 cam->frame[i].queued = 0;
2025                 cam->frame[i].status = F_UNUSED;
2026         }
2027 }
2028
2029
2030 /*--------------------------------------------------------------------------
2031   Add a frame in the FIFO list of requested frames.
2032   This function is called in process context.
2033   --------------------------------------------------------------------------*/
2034 static void w9968cf_push_frame(struct w9968cf_device* cam, u8 f_num)
2035 {
2036         u8 f;
2037         unsigned long lock_flags;
2038
2039         spin_lock_irqsave(&cam->flist_lock, lock_flags);
2040
2041         for (f=0; cam->requested_frame[f] != NULL; f++);
2042         cam->requested_frame[f] = &cam->frame[f_num];
2043         cam->frame[f_num].queued = 1;
2044         cam->frame[f_num].status = F_UNUSED; /* clear the status */
2045
2046         spin_unlock_irqrestore(&cam->flist_lock, lock_flags);
2047
2048         DBG(6, "Frame #%u pushed into the FIFO list. Position %u", f_num, f)
2049 }
2050
2051
2052 /*--------------------------------------------------------------------------
2053   Read, store and remove the first pointer in the FIFO list of requested
2054   frames. This function is called in interrupt context.
2055   --------------------------------------------------------------------------*/
2056 static void
2057 w9968cf_pop_frame(struct w9968cf_device* cam, struct w9968cf_frame_t** framep)
2058 {
2059         u8 i;
2060
2061         spin_lock(&cam->flist_lock);
2062
2063         *framep = cam->requested_frame[0];
2064
2065         /* Shift the list of pointers */
2066         for (i = 0; i < cam->nbuffers-1; i++)
2067                 cam->requested_frame[i] = cam->requested_frame[i+1];
2068         cam->requested_frame[i] = NULL;
2069
2070         spin_unlock(&cam->flist_lock);
2071
2072         DBG(6,"Popped frame #%d from the list", (*framep)->number)
2073 }
2074
2075
2076 /*--------------------------------------------------------------------------
2077   High-level video post-processing routine on grabbed frames.
2078   Return 0 on success, a negative number otherwise.
2079   --------------------------------------------------------------------------*/
2080 static int
2081 w9968cf_postprocess_frame(struct w9968cf_device* cam,
2082                           struct w9968cf_frame_t* fr)
2083 {
2084         void *pIn = fr->buffer, *pOut = cam->frame_vpp.buffer, *tmp;
2085         u16 w = cam->window.width,
2086             h = cam->window.height,
2087             d = cam->picture.depth,
2088             fmt = cam->picture.palette,
2089             rgb = cam->force_rgb,
2090             hw_w = cam->hw_width,
2091             hw_h = cam->hw_height,
2092             hw_d = cam->hw_depth;
2093         int err = 0;
2094
2095         #define _PSWAP(pIn, pOut) {tmp = (pIn); (pIn) = (pOut); (pOut) = tmp;}
2096
2097         if (cam->vpp_flag & VPP_DECOMPRESSION) {
2098                 memcpy(pOut, pIn, fr->length);
2099                 _PSWAP(pIn, pOut)
2100                 err = w9968cf_vpp->decode(pIn, fr->length, hw_w, hw_h, pOut);
2101                 PDBGG("Compressed frame length: %lu",(unsigned long)fr->length)
2102                 fr->length = (hw_w*hw_h*hw_d)/8;
2103                 _PSWAP(pIn, pOut)
2104                 if (err) {
2105                         DBG(4, "An error occurred while decoding the frame: "
2106                                "%s", symbolic(decoder_errlist, err))
2107                         return err;
2108                 } else
2109                         DBG(6, "Frame decoded")
2110         }
2111
2112         if (cam->vpp_flag & VPP_SWAP_YUV_BYTES) {
2113                 w9968cf_vpp->swap_yuvbytes(pIn, fr->length);
2114                 DBG(6, "Original UYVY component ordering changed")
2115         }
2116
2117         if (cam->vpp_flag & VPP_UPSCALE) {
2118                 w9968cf_vpp->scale_up(pIn, pOut, hw_w, hw_h, hw_d, w, h);
2119                 fr->length = (w*h*hw_d)/8;
2120                 _PSWAP(pIn, pOut)
2121                 DBG(6, "Vertical up-scaling done: %u,%u,%ubpp->%u,%u",
2122                     hw_w, hw_h, hw_d, w, h)
2123         }
2124
2125         if (cam->vpp_flag & VPP_UYVY_TO_RGBX) {
2126                 w9968cf_vpp->uyvy_to_rgbx(pIn, fr->length, pOut, fmt, rgb);
2127                 fr->length = (w*h*d)/8;
2128                 _PSWAP(pIn, pOut)
2129                 DBG(6, "UYVY-16bit to %s conversion done",
2130                     symbolic(v4l1_plist, fmt))
2131         }
2132
2133         if (pOut == fr->buffer)
2134                 memcpy(fr->buffer, cam->frame_vpp.buffer, fr->length);
2135
2136         return 0;
2137 }
2138
2139
2140
2141 /****************************************************************************
2142  * Image sensor control routines                                            *
2143  ****************************************************************************/
2144
2145 static int
2146 w9968cf_sensor_set_control(struct w9968cf_device* cam, int cid, int val)
2147 {
2148         struct ovcamchip_control ctl;
2149         int err;
2150
2151         ctl.id = cid;
2152         ctl.value = val;
2153
2154         err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_S_CTRL, &ctl);
2155
2156         return err;
2157 }
2158
2159
2160 static int
2161 w9968cf_sensor_get_control(struct w9968cf_device* cam, int cid, int* val)
2162 {
2163         struct ovcamchip_control ctl;
2164         int err;
2165
2166         ctl.id = cid;
2167
2168         err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_G_CTRL, &ctl);
2169         if (!err)
2170                 *val = ctl.value;
2171
2172         return err;
2173 }
2174
2175
2176 static int
2177 w9968cf_sensor_cmd(struct w9968cf_device* cam, unsigned int cmd, void* arg)
2178 {
2179         struct i2c_client* c = cam->sensor_client;
2180         int rc = 0;
2181
2182         if (!c || !c->driver || !c->driver->command)
2183                 return -EINVAL;
2184
2185         rc = c->driver->command(c, cmd, arg);
2186         /* The I2C driver returns -EPERM on non-supported controls */
2187         return (rc < 0 && rc != -EPERM) ? rc : 0;
2188 }
2189
2190
2191 /*--------------------------------------------------------------------------
2192   Update some settings of the image sensor.
2193   Returns: 0 on success, a negative number otherwise.
2194   --------------------------------------------------------------------------*/
2195 static int w9968cf_sensor_update_settings(struct w9968cf_device* cam)
2196 {
2197         int err = 0;
2198
2199         /* Auto brightness */
2200         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_AUTOBRIGHT,
2201                                          cam->auto_brt);
2202         if (err)
2203                 return err;
2204
2205         /* Auto exposure */
2206         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_AUTOEXP,
2207                                          cam->auto_exp);
2208         if (err)
2209                 return err;
2210
2211         /* Banding filter */
2212         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BANDFILT,
2213                                          cam->bandfilt);
2214         if (err)
2215                 return err;
2216
2217         /* Light frequency */
2218         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_FREQ,
2219                                          cam->lightfreq);
2220         if (err)
2221                 return err;
2222
2223         /* Back light */
2224         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BACKLIGHT,
2225                                          cam->backlight);
2226         if (err)
2227                 return err;
2228
2229         /* Mirror */
2230         err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_MIRROR,
2231                                          cam->mirror);
2232         if (err)
2233                 return err;
2234
2235         return 0;
2236 }
2237
2238
2239 /*--------------------------------------------------------------------------
2240   Get some current picture settings from the image sensor and update the
2241   internal 'picture' structure of the camera.
2242   Returns: 0 on success, a negative number otherwise.
2243   --------------------------------------------------------------------------*/
2244 static int w9968cf_sensor_get_picture(struct w9968cf_device* cam)
2245 {
2246         int err, v;
2247
2248         err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_CONT, &v);
2249         if (err)
2250                 return err;
2251         cam->picture.contrast = v;
2252
2253         err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_BRIGHT, &v);
2254         if (err)
2255                 return err;
2256         cam->picture.brightness = v;
2257
2258         err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_SAT, &v);
2259         if (err)
2260                 return err;
2261         cam->picture.colour = v;
2262
2263         err = w9968cf_sensor_get_control(cam, OVCAMCHIP_CID_HUE, &v);
2264         if (err)
2265                 return err;
2266         cam->picture.hue = v;
2267
2268         DBG(5, "Got picture settings from the image sensor")
2269
2270         PDBGG("Brightness, contrast, hue, colour, whiteness are "
2271               "%u,%u,%u,%u,%u", cam->picture.brightness,cam->picture.contrast,
2272               cam->picture.hue, cam->picture.colour, cam->picture.whiteness)
2273
2274         return 0;
2275 }
2276
2277
2278 /*--------------------------------------------------------------------------
2279   Update picture settings of the image sensor.
2280   Returns: 0 on success, a negative number otherwise.
2281   --------------------------------------------------------------------------*/
2282 static int
2283 w9968cf_sensor_update_picture(struct w9968cf_device* cam,
2284                               struct video_picture pict)
2285 {
2286         int err = 0;
2287
2288         if ((!cam->sensor_initialized)
2289             || pict.contrast != cam->picture.contrast) {
2290                 err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_CONT,
2291                                                  pict.contrast);
2292                 if (err)
2293                         goto fail;
2294                 DBG(4, "Contrast changed from %u to %u",
2295                     cam->picture.contrast, pict.contrast)
2296                 cam->picture.contrast = pict.contrast;
2297         }
2298
2299         if (((!cam->sensor_initialized) ||
2300             pict.brightness != cam->picture.brightness) && (!cam->auto_brt)) {
2301                 err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_BRIGHT,
2302                                                  pict.brightness);
2303                 if (err)
2304                         goto fail;
2305                 DBG(4, "Brightness changed from %u to %u",
2306                     cam->picture.brightness, pict.brightness)
2307                 cam->picture.brightness = pict.brightness;
2308         }
2309
2310         if ((!cam->sensor_initialized) || pict.colour != cam->picture.colour) {
2311                 err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_SAT,
2312                                                  pict.colour);
2313                 if (err)
2314                         goto fail;
2315                 DBG(4, "Colour changed from %u to %u",
2316                     cam->picture.colour, pict.colour)
2317                 cam->picture.colour = pict.colour;
2318         }
2319
2320         if ((!cam->sensor_initialized) || pict.hue != cam->picture.hue) {
2321                 err = w9968cf_sensor_set_control(cam, OVCAMCHIP_CID_HUE,
2322                                                  pict.hue);
2323                 if (err)
2324                         goto fail;
2325                 DBG(4, "Hue changed from %u to %u",
2326                     cam->picture.hue, pict.hue)
2327                 cam->picture.hue = pict.hue;
2328         }
2329
2330         return 0;
2331
2332 fail:
2333         DBG(4, "Failed to change sensor picture setting")
2334         return err;
2335 }
2336
2337
2338
2339 /****************************************************************************
2340  * Camera configuration                                                     *
2341  ****************************************************************************/
2342
2343 /*--------------------------------------------------------------------------
2344   This function is called when a supported image sensor is detected.
2345   Return 0 if the initialization succeeds, a negative number otherwise.
2346   --------------------------------------------------------------------------*/
2347 static int w9968cf_sensor_init(struct w9968cf_device* cam)
2348 {
2349         int err = 0;
2350
2351         if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_INITIALIZE,
2352                                       &cam->monochrome)))
2353                 goto error;
2354
2355         if ((err = w9968cf_sensor_cmd(cam, OVCAMCHIP_CMD_Q_SUBTYPE,
2356                                       &cam->sensor)))
2357                 goto error;
2358
2359         /* NOTE: Make sure width and height are a multiple of 16 */
2360         switch (cam->sensor_client->addr) {
2361                 case OV6xx0_SID:
2362                         cam->maxwidth = 352;
2363                         cam->maxheight = 288;
2364                         cam->minwidth = 64;
2365                         cam->minheight = 48;
2366                         break;
2367                 case OV7xx0_SID:
2368                         cam->maxwidth = 640;
2369                         cam->maxheight = 480;
2370                         cam->minwidth = 64;
2371                         cam->minheight = 48;
2372                         break;
2373                 default:
2374                         DBG(1, "Not supported image sensor detected for %s",
2375                             symbolic(camlist, cam->id))
2376                         return -EINVAL;
2377         }
2378
2379         /* These values depend on the ones in the ovxxx0.c sources */
2380         switch (cam->sensor) {
2381                 case CC_OV7620:
2382                         cam->start_cropx = 287;
2383                         cam->start_cropy = 35;
2384                         /* Seems to work around a bug in the image sensor */
2385                         cam->vs_polarity = 1;
2386                         cam->hs_polarity = 1;
2387                         break;
2388                 default:
2389                         cam->start_cropx = 320;
2390                         cam->start_cropy = 35;
2391                         cam->vs_polarity = 1;
2392                         cam->hs_polarity = 0;
2393         }
2394
2395         if ((err = w9968cf_sensor_update_settings(cam)))
2396                 goto error;
2397
2398         if ((err = w9968cf_sensor_update_picture(cam, cam->picture)))
2399                 goto error;
2400
2401         cam->sensor_initialized = 1;
2402
2403         DBG(2, "%s image sensor initialized", symbolic(senlist, cam->sensor))
2404         return 0;
2405
2406 error:
2407         cam->sensor_initialized = 0;
2408         cam->sensor = CC_UNKNOWN;
2409         DBG(1, "Image sensor initialization failed for %s (/dev/video%d). "
2410                "Try to detach and attach this device again",
2411             symbolic(camlist, cam->id), cam->v4ldev->minor)
2412         return err;
2413 }
2414
2415
2416 /*--------------------------------------------------------------------------
2417   Fill some basic fields in the main device data structure.
2418   This function is called once on w9968cf_usb_probe() for each recognized
2419   camera.
2420   --------------------------------------------------------------------------*/
2421 static void
2422 w9968cf_configure_camera(struct w9968cf_device* cam,
2423                          struct usb_device* udev,
2424                          enum w9968cf_model_id mod_id,
2425                          const unsigned short dev_nr)
2426 {
2427         mutex_init(&cam->fileop_mutex);
2428         init_waitqueue_head(&cam->open);
2429         spin_lock_init(&cam->urb_lock);
2430         spin_lock_init(&cam->flist_lock);
2431
2432         cam->users = 0;
2433         cam->disconnected = 0;
2434         cam->id = mod_id;
2435         cam->sensor = CC_UNKNOWN;
2436         cam->sensor_initialized = 0;
2437
2438         /* Calculate the alternate setting number (from 1 to 16)
2439            according to the 'packet_size' module parameter */
2440         if (packet_size[dev_nr] < W9968CF_MIN_PACKET_SIZE)
2441                 packet_size[dev_nr] = W9968CF_MIN_PACKET_SIZE;
2442         for (cam->altsetting = 1;
2443              packet_size[dev_nr] < wMaxPacketSize[cam->altsetting-1];
2444              cam->altsetting++);
2445
2446         cam->max_buffers = (max_buffers[dev_nr] < 2 ||
2447                             max_buffers[dev_nr] > W9968CF_MAX_BUFFERS)
2448                            ? W9968CF_BUFFERS : (u8)max_buffers[dev_nr];
2449
2450         cam->double_buffer = (double_buffer[dev_nr] == 0 ||
2451                               double_buffer[dev_nr] == 1)
2452                              ? (u8)double_buffer[dev_nr]:W9968CF_DOUBLE_BUFFER;
2453
2454         cam->clamping = (clamping[dev_nr] == 0 || clamping[dev_nr] == 1)
2455                         ? (u8)clamping[dev_nr] : W9968CF_CLAMPING;
2456
2457         cam->filter_type = (filter_type[dev_nr] == 0 ||
2458                             filter_type[dev_nr] == 1 ||
2459                             filter_type[dev_nr] == 2)
2460                            ? (u8)filter_type[dev_nr] : W9968CF_FILTER_TYPE;
2461
2462         cam->capture = 1;
2463
2464         cam->largeview = (largeview[dev_nr] == 0 || largeview[dev_nr] == 1)
2465                          ? (u8)largeview[dev_nr] : W9968CF_LARGEVIEW;
2466
2467         cam->decompression = (decompression[dev_nr] == 0 ||
2468                               decompression[dev_nr] == 1 ||
2469                               decompression[dev_nr] == 2)
2470                              ? (u8)decompression[dev_nr]:W9968CF_DECOMPRESSION;
2471
2472         cam->upscaling = (upscaling[dev_nr] == 0 ||
2473                           upscaling[dev_nr] == 1)
2474                          ? (u8)upscaling[dev_nr] : W9968CF_UPSCALING;
2475
2476         cam->auto_brt = (autobright[dev_nr] == 0 || autobright[dev_nr] == 1)
2477                         ? (u8)autobright[dev_nr] : W9968CF_AUTOBRIGHT;
2478
2479         cam->auto_exp = (autoexp[dev_nr] == 0 || autoexp[dev_nr] == 1)
2480                         ? (u8)autoexp[dev_nr] : W9968CF_AUTOEXP;
2481
2482         cam->lightfreq = (lightfreq[dev_nr] == 50 || lightfreq[dev_nr] == 60)
2483                          ? (u8)lightfreq[dev_nr] : W9968CF_LIGHTFREQ;
2484
2485         cam->bandfilt = (bandingfilter[dev_nr] == 0 ||
2486                          bandingfilter[dev_nr] == 1)
2487                         ? (u8)bandingfilter[dev_nr] : W9968CF_BANDINGFILTER;
2488
2489         cam->backlight = (backlight[dev_nr] == 0 || backlight[dev_nr] == 1)
2490                          ? (u8)backlight[dev_nr] : W9968CF_BACKLIGHT;
2491
2492         cam->clockdiv = (clockdiv[dev_nr] == -1 || clockdiv[dev_nr] >= 0)
2493                         ? (s8)clockdiv[dev_nr] : W9968CF_CLOCKDIV;
2494
2495         cam->mirror = (mirror[dev_nr] == 0 || mirror[dev_nr] == 1)
2496                       ? (u8)mirror[dev_nr] : W9968CF_MIRROR;
2497
2498         cam->monochrome = (monochrome[dev_nr] == 0 || monochrome[dev_nr] == 1)
2499                           ? monochrome[dev_nr] : W9968CF_MONOCHROME;
2500
2501         cam->picture.brightness = (u16)brightness[dev_nr];
2502         cam->picture.hue = (u16)hue[dev_nr];
2503         cam->picture.colour = (u16)colour[dev_nr];
2504         cam->picture.contrast = (u16)contrast[dev_nr];
2505         cam->picture.whiteness = (u16)whiteness[dev_nr];
2506         if (w9968cf_valid_palette((u16)force_palette[dev_nr])) {
2507                 cam->picture.palette = (u16)force_palette[dev_nr];
2508                 cam->force_palette = 1;
2509         } else {
2510                 cam->force_palette = 0;
2511                 if (cam->decompression == 0)
2512                         cam->picture.palette = W9968CF_PALETTE_DECOMP_OFF;
2513                 else if (cam->decompression == 1)
2514                         cam->picture.palette = W9968CF_PALETTE_DECOMP_FORCE;
2515                 else
2516                         cam->picture.palette = W9968CF_PALETTE_DECOMP_ON;
2517         }
2518         cam->picture.depth = w9968cf_valid_depth(cam->picture.palette);
2519
2520         cam->force_rgb = (force_rgb[dev_nr] == 0 || force_rgb[dev_nr] == 1)
2521                          ? (u8)force_rgb[dev_nr] : W9968CF_FORCE_RGB;
2522
2523         cam->window.x = 0;
2524         cam->window.y = 0;
2525         cam->window.width = W9968CF_WIDTH;
2526         cam->window.height = W9968CF_HEIGHT;
2527         cam->window.chromakey = 0;
2528         cam->window.clipcount = 0;
2529         cam->window.flags = 0;
2530
2531         DBG(3, "%s configured with settings #%u:",
2532             symbolic(camlist, cam->id), dev_nr)
2533
2534         DBG(3, "- Data packet size for USB isochrnous transfer: %u bytes",
2535             wMaxPacketSize[cam->altsetting-1])
2536
2537         DBG(3, "- Number of requested video frame buffers: %u",
2538             cam->max_buffers)
2539
2540         if (cam->double_buffer)
2541                 DBG(3, "- Hardware double buffering enabled")
2542         else
2543                 DBG(3, "- Hardware double buffering disabled")
2544
2545         if (cam->filter_type == 0)
2546                 DBG(3, "- Video filtering disabled")
2547         else if (cam->filter_type == 1)
2548                 DBG(3, "- Video filtering enabled: type 1-2-1")
2549         else if (cam->filter_type == 2)
2550                 DBG(3, "- Video filtering enabled: type 2-3-6-3-2")
2551
2552         if (cam->clamping)
2553                 DBG(3, "- Video data clamping (CCIR-601 format) enabled")
2554         else
2555                 DBG(3, "- Video data clamping (CCIR-601 format) disabled")
2556
2557         if (cam->largeview)
2558                 DBG(3, "- Large view enabled")
2559         else
2560                 DBG(3, "- Large view disabled")
2561
2562         if ((cam->decompression) == 0 && (!cam->force_palette))
2563                 DBG(3, "- Decompression disabled")
2564         else if ((cam->decompression) == 1 && (!cam->force_palette))
2565                 DBG(3, "- Decompression forced")
2566         else if ((cam->decompression) == 2 && (!cam->force_palette))
2567                 DBG(3, "- Decompression allowed")
2568
2569         if (cam->upscaling)
2570                 DBG(3, "- Software image scaling enabled")
2571         else
2572                 DBG(3, "- Software image scaling disabled")
2573
2574         if (cam->force_palette)
2575                 DBG(3, "- Image palette forced to %s",
2576                     symbolic(v4l1_plist, cam->picture.palette))
2577
2578         if (cam->force_rgb)
2579                 DBG(3, "- RGB component ordering will be used instead of BGR")
2580
2581         if (cam->auto_brt)
2582                 DBG(3, "- Auto brightness enabled")
2583         else
2584                 DBG(3, "- Auto brightness disabled")
2585
2586         if (cam->auto_exp)
2587                 DBG(3, "- Auto exposure enabled")
2588         else
2589                 DBG(3, "- Auto exposure disabled")
2590
2591         if (cam->backlight)
2592                 DBG(3, "- Backlight exposure algorithm enabled")
2593         else
2594                 DBG(3, "- Backlight exposure algorithm disabled")
2595
2596         if (cam->mirror)
2597                 DBG(3, "- Mirror enabled")
2598         else
2599                 DBG(3, "- Mirror disabled")
2600
2601         if (cam->bandfilt)
2602                 DBG(3, "- Banding filter enabled")
2603         else
2604                 DBG(3, "- Banding filter disabled")
2605
2606         DBG(3, "- Power lighting frequency: %u", cam->lightfreq)
2607
2608         if (cam->clockdiv == -1)
2609                 DBG(3, "- Automatic clock divisor enabled")
2610         else
2611                 DBG(3, "- Clock divisor: %d", cam->clockdiv)
2612
2613         if (cam->monochrome)
2614                 DBG(3, "- Image sensor used as monochrome")
2615         else
2616                 DBG(3, "- Image sensor not used as monochrome")
2617 }
2618
2619
2620 /*--------------------------------------------------------------------------
2621   If the video post-processing module is not loaded, some parameters
2622   must be overridden.
2623   --------------------------------------------------------------------------*/
2624 static void w9968cf_adjust_configuration(struct w9968cf_device* cam)
2625 {
2626         if (!w9968cf_vpp) {
2627                 if (cam->decompression == 1) {
2628                         cam->decompression = 2;
2629                         DBG(2, "Video post-processing module not found: "
2630                                "'decompression' parameter forced to 2")
2631                 }
2632                 if (cam->upscaling) {
2633                         cam->upscaling = 0;
2634                         DBG(2, "Video post-processing module not found: "
2635                                "'upscaling' parameter forced to 0")
2636                 }
2637                 if (cam->picture.palette != VIDEO_PALETTE_UYVY) {
2638                         cam->force_palette = 0;
2639                         DBG(2, "Video post-processing module not found: "
2640                                "'force_palette' parameter forced to 0")
2641                 }
2642                 cam->picture.palette = VIDEO_PALETTE_UYVY;
2643                 cam->picture.depth = w9968cf_valid_depth(cam->picture.palette);
2644         }
2645 }
2646
2647
2648 /*--------------------------------------------------------------------------
2649   Release the resources used by the driver.
2650   This function is called on disconnect
2651   (or on close if deallocation has been deferred)
2652   --------------------------------------------------------------------------*/
2653 static void w9968cf_release_resources(struct w9968cf_device* cam)
2654 {
2655         mutex_lock(&w9968cf_devlist_mutex);
2656
2657         DBG(2, "V4L device deregistered: /dev/video%d", cam->v4ldev->minor)
2658
2659         video_unregister_device(cam->v4ldev);
2660         list_del(&cam->v4llist);
2661         i2c_del_adapter(&cam->i2c_adapter);
2662         w9968cf_deallocate_memory(cam);
2663         kfree(cam->control_buffer);
2664         kfree(cam->data_buffer);
2665
2666         mutex_unlock(&w9968cf_devlist_mutex);
2667 }
2668
2669
2670
2671 /****************************************************************************
2672  * Video4Linux interface                                                    *
2673  ****************************************************************************/
2674
2675 static int w9968cf_open(struct inode* inode, struct file* filp)
2676 {
2677         struct w9968cf_device* cam;
2678         int err;
2679
2680         /* This the only safe way to prevent race conditions with disconnect */
2681         if (!down_read_trylock(&w9968cf_disconnect))
2682                 return -ERESTARTSYS;
2683
2684         cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
2685
2686         mutex_lock(&cam->dev_mutex);
2687
2688         if (cam->sensor == CC_UNKNOWN) {
2689                 DBG(2, "No supported image sensor has been detected by the "
2690                        "'ovcamchip' module for the %s (/dev/video%d). Make "
2691                        "sure it is loaded *before* (re)connecting the camera.",
2692                     symbolic(camlist, cam->id), cam->v4ldev->minor)
2693                 mutex_unlock(&cam->dev_mutex);
2694                 up_read(&w9968cf_disconnect);
2695                 return -ENODEV;
2696         }
2697
2698         if (cam->users) {
2699                 DBG(2, "%s (/dev/video%d) has been already occupied by '%s'",
2700                     symbolic(camlist, cam->id),cam->v4ldev->minor,cam->command)
2701                 if ((filp->f_flags & O_NONBLOCK)||(filp->f_flags & O_NDELAY)) {
2702                         mutex_unlock(&cam->dev_mutex);
2703                         up_read(&w9968cf_disconnect);
2704                         return -EWOULDBLOCK;
2705                 }
2706                 mutex_unlock(&cam->dev_mutex);
2707                 err = wait_event_interruptible_exclusive(cam->open,
2708                                                          cam->disconnected ||
2709                                                          !cam->users);
2710                 if (err) {
2711                         up_read(&w9968cf_disconnect);
2712                         return err;
2713                 }
2714                 if (cam->disconnected) {
2715                         up_read(&w9968cf_disconnect);
2716                         return -ENODEV;
2717                 }
2718                 mutex_lock(&cam->dev_mutex);
2719         }
2720
2721         DBG(5, "Opening '%s', /dev/video%d ...",
2722             symbolic(camlist, cam->id), cam->v4ldev->minor)
2723
2724         cam->streaming = 0;
2725         cam->misconfigured = 0;
2726
2727         w9968cf_adjust_configuration(cam);
2728
2729         if ((err = w9968cf_allocate_memory(cam)))
2730                 goto deallocate_memory;
2731
2732         if ((err = w9968cf_init_chip(cam)))
2733                 goto deallocate_memory;
2734
2735         if ((err = w9968cf_start_transfer(cam)))
2736                 goto deallocate_memory;
2737
2738         filp->private_data = cam;
2739
2740         cam->users++;
2741         strcpy(cam->command, current->comm);
2742
2743         init_waitqueue_head(&cam->wait_queue);
2744
2745         DBG(5, "Video device is open")
2746
2747         mutex_unlock(&cam->dev_mutex);
2748         up_read(&w9968cf_disconnect);
2749
2750         return 0;
2751
2752 deallocate_memory:
2753         w9968cf_deallocate_memory(cam);
2754         DBG(2, "Failed to open the video device")
2755         mutex_unlock(&cam->dev_mutex);
2756         up_read(&w9968cf_disconnect);
2757         return err;
2758 }
2759
2760
2761 static int w9968cf_release(struct inode* inode, struct file* filp)
2762 {
2763         struct w9968cf_device* cam;
2764
2765         cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
2766
2767         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
2768
2769         w9968cf_stop_transfer(cam);
2770
2771         if (cam->disconnected) {
2772                 w9968cf_release_resources(cam);
2773                 mutex_unlock(&cam->dev_mutex);
2774                 kfree(cam);
2775                 return 0;
2776         }
2777
2778         cam->users--;
2779         w9968cf_deallocate_memory(cam);
2780         wake_up_interruptible_nr(&cam->open, 1);
2781
2782         DBG(5, "Video device closed")
2783         mutex_unlock(&cam->dev_mutex);
2784         return 0;
2785 }
2786
2787
2788 static ssize_t
2789 w9968cf_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
2790 {
2791         struct w9968cf_device* cam;
2792         struct w9968cf_frame_t* fr;
2793         int err = 0;
2794
2795         cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
2796
2797         if (filp->f_flags & O_NONBLOCK)
2798                 return -EWOULDBLOCK;
2799
2800         if (mutex_lock_interruptible(&cam->fileop_mutex))
2801                 return -ERESTARTSYS;
2802
2803         if (cam->disconnected) {
2804                 DBG(2, "Device not present")
2805                 mutex_unlock(&cam->fileop_mutex);
2806                 return -ENODEV;
2807         }
2808
2809         if (cam->misconfigured) {
2810                 DBG(2, "The camera is misconfigured. Close and open it again.")
2811                 mutex_unlock(&cam->fileop_mutex);
2812                 return -EIO;
2813         }
2814
2815         if (!cam->frame[0].queued)
2816                 w9968cf_push_frame(cam, 0);
2817
2818         if (!cam->frame[1].queued)
2819                 w9968cf_push_frame(cam, 1);
2820
2821         err = wait_event_interruptible(cam->wait_queue,
2822                                        cam->frame[0].status == F_READY ||
2823                                        cam->frame[1].status == F_READY ||
2824                                        cam->disconnected);
2825         if (err) {
2826                 mutex_unlock(&cam->fileop_mutex);
2827                 return err;
2828         }
2829         if (cam->disconnected) {
2830                 mutex_unlock(&cam->fileop_mutex);
2831                 return -ENODEV;
2832         }
2833
2834         fr = (cam->frame[0].status == F_READY) ? &cam->frame[0]:&cam->frame[1];
2835
2836         if (w9968cf_vpp)
2837                 w9968cf_postprocess_frame(cam, fr);
2838
2839         if (count > fr->length)
2840                 count = fr->length;
2841
2842         if (copy_to_user(buf, fr->buffer, count)) {
2843                 fr->status = F_UNUSED;
2844                 mutex_unlock(&cam->fileop_mutex);
2845                 return -EFAULT;
2846         }
2847         *f_pos += count;
2848
2849         fr->status = F_UNUSED;
2850
2851         DBG(5, "%zu bytes read", count)
2852
2853         mutex_unlock(&cam->fileop_mutex);
2854         return count;
2855 }
2856
2857
2858 static int w9968cf_mmap(struct file* filp, struct vm_area_struct *vma)
2859 {
2860         struct w9968cf_device* cam = (struct w9968cf_device*)
2861                                      video_get_drvdata(video_devdata(filp));
2862         unsigned long vsize = vma->vm_end - vma->vm_start,
2863                       psize = cam->nbuffers * cam->frame[0].size,
2864                       start = vma->vm_start,
2865                       pos = (unsigned long)cam->frame[0].buffer,
2866                       page;
2867
2868         if (cam->disconnected) {
2869                 DBG(2, "Device not present")
2870                 return -ENODEV;
2871         }
2872
2873         if (cam->misconfigured) {
2874                 DBG(2, "The camera is misconfigured. Close and open it again")
2875                 return -EIO;
2876         }
2877
2878         PDBGG("mmapping %lu bytes...", vsize)
2879
2880         if (vsize > psize - (vma->vm_pgoff << PAGE_SHIFT))
2881                 return -EINVAL;
2882
2883         while (vsize > 0) {
2884                 page = vmalloc_to_pfn((void *)pos);
2885                 if (remap_pfn_range(vma, start, page + vma->vm_pgoff,
2886                                                 PAGE_SIZE, vma->vm_page_prot))
2887                         return -EAGAIN;
2888                 start += PAGE_SIZE;
2889                 pos += PAGE_SIZE;
2890                 vsize -= PAGE_SIZE;
2891         }
2892
2893         DBG(5, "mmap method successfully called")
2894         return 0;
2895 }
2896
2897
2898 static int
2899 w9968cf_ioctl(struct inode* inode, struct file* filp,
2900               unsigned int cmd, unsigned long arg)
2901 {
2902         struct w9968cf_device* cam;
2903         int err;
2904
2905         cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
2906
2907         if (mutex_lock_interruptible(&cam->fileop_mutex))
2908                 return -ERESTARTSYS;
2909
2910         if (cam->disconnected) {
2911                 DBG(2, "Device not present")
2912                 mutex_unlock(&cam->fileop_mutex);
2913                 return -ENODEV;
2914         }
2915
2916         if (cam->misconfigured) {
2917                 DBG(2, "The camera is misconfigured. Close and open it again.")
2918                 mutex_unlock(&cam->fileop_mutex);
2919                 return -EIO;
2920         }
2921
2922         err = w9968cf_v4l_ioctl(inode, filp, cmd, (void __user *)arg);
2923
2924         mutex_unlock(&cam->fileop_mutex);
2925         return err;
2926 }
2927
2928
2929 static int w9968cf_v4l_ioctl(struct inode* inode, struct file* filp,
2930                              unsigned int cmd, void __user * arg)
2931 {
2932         struct w9968cf_device* cam;
2933         const char* v4l1_ioctls[] = {
2934                 "?", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER",
2935                 "GPICT", "SPICT", "CCAPTURE", "GWIN", "SWIN", "GFBUF",
2936                 "SFBUF", "KEY", "GFREQ", "SFREQ", "GAUDIO", "SAUDIO",
2937                 "SYNC", "MCAPTURE", "GMBUF", "GUNIT", "GCAPTURE", "SCAPTURE",
2938                 "SPLAYMODE", "SWRITEMODE", "GPLAYINFO", "SMICROCODE",
2939                 "GVBIFMT", "SVBIFMT"
2940         };
2941
2942         #define V4L1_IOCTL(cmd) \
2943                 ((_IOC_NR((cmd)) < ARRAY_SIZE(v4l1_ioctls)) ? \
2944                 v4l1_ioctls[_IOC_NR((cmd))] : "?")
2945
2946         cam = (struct w9968cf_device*)video_get_drvdata(video_devdata(filp));
2947
2948         switch (cmd) {
2949
2950         case VIDIOCGCAP: /* get video capability */
2951         {
2952                 struct video_capability cap = {
2953                         .type = VID_TYPE_CAPTURE | VID_TYPE_SCALES,
2954                         .channels = 1,
2955                         .audios = 0,
2956                         .minwidth = cam->minwidth,
2957                         .minheight = cam->minheight,
2958                 };
2959                 sprintf(cap.name, "W996[87]CF USB Camera #%d",
2960                         cam->v4ldev->minor);
2961                 cap.maxwidth = (cam->upscaling && w9968cf_vpp)
2962                                ? max((u16)W9968CF_MAX_WIDTH, cam->maxwidth)
2963                                  : cam->maxwidth;
2964                 cap.maxheight = (cam->upscaling && w9968cf_vpp)
2965                                 ? max((u16)W9968CF_MAX_HEIGHT, cam->maxheight)
2966                                   : cam->maxheight;
2967
2968                 if (copy_to_user(arg, &cap, sizeof(cap)))
2969                         return -EFAULT;
2970
2971                 DBG(5, "VIDIOCGCAP successfully called")
2972                 return 0;
2973         }
2974
2975         case VIDIOCGCHAN: /* get video channel informations */
2976         {
2977                 struct video_channel chan;
2978                 if (copy_from_user(&chan, arg, sizeof(chan)))
2979                         return -EFAULT;
2980
2981                 if (chan.channel != 0)
2982                         return -EINVAL;
2983
2984                 strcpy(chan.name, "Camera");
2985                 chan.tuners = 0;
2986                 chan.flags = 0;
2987                 chan.type = VIDEO_TYPE_CAMERA;
2988                 chan.norm = VIDEO_MODE_AUTO;
2989
2990                 if (copy_to_user(arg, &chan, sizeof(chan)))
2991                         return -EFAULT;
2992
2993                 DBG(5, "VIDIOCGCHAN successfully called")
2994                 return 0;
2995         }
2996
2997         case VIDIOCSCHAN: /* set active channel */
2998         {
2999                 struct video_channel chan;
3000
3001                 if (copy_from_user(&chan, arg, sizeof(chan)))
3002                         return -EFAULT;
3003
3004                 if (chan.channel != 0)
3005                         return -EINVAL;
3006
3007                 DBG(5, "VIDIOCSCHAN successfully called")
3008                 return 0;
3009         }
3010
3011         case VIDIOCGPICT: /* get image properties of the picture */
3012         {
3013                 if (w9968cf_sensor_get_picture(cam))
3014                         return -EIO;
3015
3016                 if (copy_to_user(arg, &cam->picture, sizeof(cam->picture)))
3017                         return -EFAULT;
3018
3019                 DBG(5, "VIDIOCGPICT successfully called")
3020                 return 0;
3021         }
3022
3023         case VIDIOCSPICT: /* change picture settings */
3024         {
3025                 struct video_picture pict;
3026                 int err = 0;
3027
3028                 if (copy_from_user(&pict, arg, sizeof(pict)))
3029                         return -EFAULT;
3030
3031                 if ( (cam->force_palette || !w9968cf_vpp)
3032                      && pict.palette != cam->picture.palette ) {
3033                         DBG(4, "Palette %s rejected: only %s is allowed",
3034                             symbolic(v4l1_plist, pict.palette),
3035                             symbolic(v4l1_plist, cam->picture.palette))
3036                         return -EINVAL;
3037                 }
3038
3039                 if (!w9968cf_valid_palette(pict.palette)) {
3040                         DBG(4, "Palette %s not supported. VIDIOCSPICT failed",
3041                             symbolic(v4l1_plist, pict.palette))
3042                         return -EINVAL;
3043                 }
3044
3045                 if (!cam->force_palette) {
3046                    if (cam->decompression == 0) {
3047                       if (w9968cf_need_decompression(pict.palette)) {
3048                          DBG(4, "Decompression disabled: palette %s is not "
3049                                 "allowed. VIDIOCSPICT failed",
3050                              symbolic(v4l1_plist, pict.palette))
3051                          return -EINVAL;
3052                       }
3053                    } else if (cam->decompression == 1) {
3054                       if (!w9968cf_need_decompression(pict.palette)) {
3055                          DBG(4, "Decompression forced: palette %s is not "
3056                                 "allowed. VIDIOCSPICT failed",
3057                              symbolic(v4l1_plist, pict.palette))
3058                          return -EINVAL;
3059                       }
3060                    }
3061                 }
3062
3063                 if (pict.depth != w9968cf_valid_depth(pict.palette)) {
3064                         DBG(4, "Requested depth %u bpp is not valid for %s "
3065                                "palette: ignored and changed to %u bpp",
3066                             pict.depth, symbolic(v4l1_plist, pict.palette),
3067                             w9968cf_valid_depth(pict.palette))
3068                         pict.depth = w9968cf_valid_depth(pict.palette);
3069                 }
3070
3071                 if (pict.palette != cam->picture.palette) {
3072                         if(*cam->requested_frame
3073                            || cam->frame_current->queued) {
3074                                 err = wait_event_interruptible
3075                                       ( cam->wait_queue,
3076                                         cam->disconnected ||
3077                                         (!*cam->requested_frame &&
3078                                          !cam->frame_current->queued) );
3079                                 if (err)
3080                                         return err;
3081                                 if (cam->disconnected)
3082                                         return -ENODEV;
3083                         }
3084
3085                         if (w9968cf_stop_transfer(cam))
3086                                 goto ioctl_fail;
3087
3088                         if (w9968cf_set_picture(cam, pict))
3089                                 goto ioctl_fail;
3090
3091                         if (w9968cf_start_transfer(cam))
3092                                 goto ioctl_fail;
3093
3094                 } else if (w9968cf_sensor_update_picture(cam, pict))
3095                         return -EIO;
3096
3097
3098                 DBG(5, "VIDIOCSPICT successfully called")
3099                 return 0;
3100         }
3101
3102         case VIDIOCSWIN: /* set capture area */
3103         {
3104                 struct video_window win;
3105                 int err = 0;
3106
3107                 if (copy_from_user(&win, arg, sizeof(win)))
3108                         return -EFAULT;
3109
3110                 DBG(6, "VIDIOCSWIN called: clipcount=%d, flags=%u, "
3111                        "x=%u, y=%u, %ux%u", win.clipcount, win.flags,
3112                     win.x, win.y, win.width, win.height)
3113
3114                 if (win.clipcount != 0 || win.flags != 0)
3115                         return -EINVAL;
3116
3117                 if ((err = w9968cf_adjust_window_size(cam, (u16*)&win.width,
3118                                                       (u16*)&win.height))) {
3119                         DBG(4, "Resolution not supported (%ux%u). "
3120                                "VIDIOCSWIN failed", win.width, win.height)
3121                         return err;
3122                 }
3123
3124                 if (win.x != cam->window.x ||
3125                     win.y != cam->window.y ||
3126                     win.width != cam->window.width ||
3127                     win.height != cam->window.height) {
3128                         if(*cam->requested_frame
3129                            || cam->frame_current->queued) {
3130                                 err = wait_event_interruptible
3131                                       ( cam->wait_queue,
3132                                         cam->disconnected ||
3133                                         (!*cam->requested_frame &&
3134                                          !cam->frame_current->queued) );
3135                                 if (err)
3136                                         return err;
3137                                 if (cam->disconnected)
3138                                         return -ENODEV;
3139                         }
3140
3141                         if (w9968cf_stop_transfer(cam))
3142                                 goto ioctl_fail;
3143
3144                         /* This _must_ be called before set_window() */
3145                         if (w9968cf_set_picture(cam, cam->picture))
3146                                 goto ioctl_fail;
3147
3148                         if (w9968cf_set_window(cam, win))
3149                                 goto ioctl_fail;
3150
3151                         if (w9968cf_start_transfer(cam))
3152                                 goto ioctl_fail;
3153                 }
3154
3155                 DBG(5, "VIDIOCSWIN successfully called. ")
3156                 return 0;
3157         }
3158
3159         case VIDIOCGWIN: /* get current window properties */
3160         {
3161                 if (copy_to_user(arg,&cam->window,sizeof(struct video_window)))
3162                         return -EFAULT;
3163
3164                 DBG(5, "VIDIOCGWIN successfully called")
3165                 return 0;
3166         }
3167
3168         case VIDIOCGMBUF: /* request for memory (mapped) buffer */
3169         {
3170                 struct video_mbuf mbuf;
3171                 u8 i;
3172
3173                 mbuf.size = cam->nbuffers * cam->frame[0].size;
3174                 mbuf.frames = cam->nbuffers;
3175                 for (i = 0; i < cam->nbuffers; i++)
3176                         mbuf.offsets[i] = (unsigned long)cam->frame[i].buffer -
3177                                           (unsigned long)cam->frame[0].buffer;
3178
3179                 if (copy_to_user(arg, &mbuf, sizeof(mbuf)))
3180                         return -EFAULT;
3181
3182                 DBG(5, "VIDIOCGMBUF successfully called")
3183                 return 0;
3184         }
3185
3186         case VIDIOCMCAPTURE: /* start the capture to a frame */
3187         {
3188                 struct video_mmap mmap;
3189                 struct w9968cf_frame_t* fr;
3190                 int err = 0;
3191
3192                 if (copy_from_user(&mmap, arg, sizeof(mmap)))
3193                         return -EFAULT;
3194
3195                 DBG(6, "VIDIOCMCAPTURE called: frame #%u, format=%s, %dx%d",
3196                     mmap.frame, symbolic(v4l1_plist, mmap.format),
3197                     mmap.width, mmap.height)
3198
3199                 if (mmap.frame >= cam->nbuffers) {
3200                         DBG(4, "Invalid frame number (%u). "
3201                                "VIDIOCMCAPTURE failed", mmap.frame)
3202                         return -EINVAL;
3203                 }
3204
3205                 if (mmap.format!=cam->picture.palette &&
3206                     (cam->force_palette || !w9968cf_vpp)) {
3207                         DBG(4, "Palette %s rejected: only %s is allowed",
3208                             symbolic(v4l1_plist, mmap.format),
3209                             symbolic(v4l1_plist, cam->picture.palette))
3210                         return -EINVAL;
3211                 }
3212
3213                 if (!w9968cf_valid_palette(mmap.format)) {
3214                         DBG(4, "Palette %s not supported. "
3215                                "VIDIOCMCAPTURE failed",
3216                             symbolic(v4l1_plist, mmap.format))
3217                         return -EINVAL;
3218                 }
3219
3220                 if (!cam->force_palette) {
3221                    if (cam->decompression == 0) {
3222                       if (w9968cf_need_decompression(mmap.format)) {
3223                          DBG(4, "Decompression disabled: palette %s is not "
3224                                 "allowed. VIDIOCSPICT failed",
3225                              symbolic(v4l1_plist, mmap.format))
3226                          return -EINVAL;
3227                       }
3228                    } else if (cam->decompression == 1) {
3229                       if (!w9968cf_need_decompression(mmap.format)) {
3230                          DBG(4, "Decompression forced: palette %s is not "
3231                                 "allowed. VIDIOCSPICT failed",
3232                              symbolic(v4l1_plist, mmap.format))
3233                          return -EINVAL;
3234                       }
3235                    }
3236                 }
3237
3238                 if ((err = w9968cf_adjust_window_size(cam, (u16*)&mmap.width,
3239                                                       (u16*)&mmap.height))) {
3240                         DBG(4, "Resolution not supported (%dx%d). "
3241                                "VIDIOCMCAPTURE failed",
3242                             mmap.width, mmap.height)
3243                         return err;
3244                 }
3245
3246                 fr = &cam->frame[mmap.frame];
3247
3248                 if (mmap.width  != cam->window.width ||
3249                     mmap.height != cam->window.height ||
3250                     mmap.format != cam->picture.palette) {
3251
3252                         struct video_window win;
3253                         struct video_picture pict;
3254
3255                         if(*cam->requested_frame
3256                            || cam->frame_current->queued) {
3257                                 DBG(6, "VIDIOCMCAPTURE. Change settings for "
3258                                        "frame #%u: %dx%d, format %s. Wait...",
3259                                     mmap.frame, mmap.width, mmap.height,
3260                                     symbolic(v4l1_plist, mmap.format))
3261                                 err = wait_event_interruptible
3262                                       ( cam->wait_queue,
3263                                         cam->disconnected ||
3264                                         (!*cam->requested_frame &&
3265                                          !cam->frame_current->queued) );
3266                                 if (err)
3267                                         return err;
3268                                 if (cam->disconnected)
3269                                         return -ENODEV;
3270                         }
3271
3272                         memcpy(&win, &cam->window, sizeof(win));
3273                         memcpy(&pict, &cam->picture, sizeof(pict));
3274                         win.width = mmap.width;
3275                         win.height = mmap.height;
3276                         pict.palette = mmap.format;
3277
3278                         if (w9968cf_stop_transfer(cam))
3279                                 goto ioctl_fail;
3280
3281                         /* This before set_window */
3282                         if (w9968cf_set_picture(cam, pict))
3283                                 goto ioctl_fail;
3284
3285                         if (w9968cf_set_window(cam, win))
3286                                 goto ioctl_fail;
3287
3288                         if (w9968cf_start_transfer(cam))
3289                                 goto ioctl_fail;
3290
3291                 } else  if (fr->queued) {
3292
3293                         DBG(6, "Wait until frame #%u is free", mmap.frame)
3294
3295                         err = wait_event_interruptible(cam->wait_queue,
3296                                                        cam->disconnected ||
3297                                                        (!fr->queued));
3298                         if (err)
3299                                 return err;
3300                         if (cam->disconnected)
3301                                 return -ENODEV;
3302                 }
3303
3304                 w9968cf_push_frame(cam, mmap.frame);
3305                 DBG(5, "VIDIOCMCAPTURE(%u): successfully called", mmap.frame)
3306                 return 0;
3307         }
3308
3309         case VIDIOCSYNC: /* wait until the capture of a frame is finished */
3310         {
3311                 unsigned int f_num;
3312                 struct w9968cf_frame_t* fr;
3313                 int err = 0;
3314
3315                 if (copy_from_user(&f_num, arg, sizeof(f_num)))
3316                         return -EFAULT;
3317
3318                 if (f_num >= cam->nbuffers) {
3319                         DBG(4, "Invalid frame number (%u). "
3320                                "VIDIOCMCAPTURE failed", f_num)
3321                         return -EINVAL;
3322                 }
3323
3324                 DBG(6, "VIDIOCSYNC called for frame #%u", f_num)
3325
3326                 fr = &cam->frame[f_num];
3327
3328                 switch (fr->status) {
3329                 case F_UNUSED:
3330                         if (!fr->queued) {
3331                                 DBG(4, "VIDIOSYNC: Frame #%u not requested!",
3332                                     f_num)
3333                                 return -EFAULT;
3334                         }
3335                 case F_ERROR:
3336                 case F_GRABBING:
3337                         err = wait_event_interruptible(cam->wait_queue,
3338                                                        (fr->status == F_READY)
3339                                                        || cam->disconnected);
3340                         if (err)
3341                                 return err;
3342                         if (cam->disconnected)
3343                                 return -ENODEV;
3344                         break;
3345                 case F_READY:
3346                         break;
3347                 }
3348
3349                 if (w9968cf_vpp)
3350                         w9968cf_postprocess_frame(cam, fr);
3351
3352                 fr->status = F_UNUSED;
3353
3354                 DBG(5, "VIDIOCSYNC(%u) successfully called", f_num)
3355                 return 0;
3356         }
3357
3358         case VIDIOCGUNIT:/* report the unit numbers of the associated devices*/
3359         {
3360                 struct video_unit unit = {
3361                         .video = cam->v4ldev->minor,
3362                         .vbi = VIDEO_NO_UNIT,
3363                         .radio = VIDEO_NO_UNIT,
3364                         .audio = VIDEO_NO_UNIT,
3365                         .teletext = VIDEO_NO_UNIT,
3366                 };
3367
3368                 if (copy_to_user(arg, &unit, sizeof(unit)))
3369                         return -EFAULT;
3370
3371                 DBG(5, "VIDIOCGUNIT successfully called")
3372                 return 0;
3373         }
3374
3375         case VIDIOCKEY:
3376                 return 0;
3377
3378         case VIDIOCGFBUF:
3379         {
3380                 if (clear_user(arg, sizeof(struct video_buffer)))
3381                         return -EFAULT;
3382
3383                 DBG(5, "VIDIOCGFBUF successfully called")
3384                 return 0;
3385         }
3386
3387         case VIDIOCGTUNER:
3388         {
3389                 struct video_tuner tuner;
3390                 if (copy_from_user(&tuner, arg, sizeof(tuner)))
3391                         return -EFAULT;
3392
3393                 if (tuner.tuner != 0)
3394                         return -EINVAL;
3395
3396                 strcpy(tuner.name, "no_tuner");
3397                 tuner.rangelow = 0;
3398                 tuner.rangehigh = 0;
3399                 tuner.flags = VIDEO_TUNER_NORM;
3400                 tuner.mode = VIDEO_MODE_AUTO;
3401                 tuner.signal = 0xffff;
3402
3403                 if (copy_to_user(arg, &tuner, sizeof(tuner)))
3404                         return -EFAULT;
3405
3406                 DBG(5, "VIDIOCGTUNER successfully called")
3407                 return 0;
3408         }
3409
3410         case VIDIOCSTUNER:
3411         {
3412                 struct video_tuner tuner;
3413                 if (copy_from_user(&tuner, arg, sizeof(tuner)))
3414                         return -EFAULT;
3415
3416                 if (tuner.tuner != 0)
3417                         return -EINVAL;
3418
3419                 if (tuner.mode != VIDEO_MODE_AUTO)
3420                         return -EINVAL;
3421
3422                 DBG(5, "VIDIOCSTUNER successfully called")
3423                 return 0;
3424         }
3425
3426         case VIDIOCSFBUF:
3427         case VIDIOCCAPTURE:
3428         case VIDIOCGFREQ:
3429         case VIDIOCSFREQ:
3430         case VIDIOCGAUDIO:
3431         case VIDIOCSAUDIO:
3432         case VIDIOCSPLAYMODE:
3433         case VIDIOCSWRITEMODE:
3434         case VIDIOCGPLAYINFO:
3435         case VIDIOCSMICROCODE:
3436         case VIDIOCGVBIFMT:
3437         case VIDIOCSVBIFMT:
3438                 DBG(4, "Unsupported V4L1 IOCtl: VIDIOC%s "
3439                        "(type 0x%01X, "
3440                        "n. 0x%01X, "
3441                        "dir. 0x%01X, "
3442                        "size 0x%02X)",
3443                     V4L1_IOCTL(cmd),
3444                     _IOC_TYPE(cmd),_IOC_NR(cmd),_IOC_DIR(cmd),_IOC_SIZE(cmd))
3445
3446                 return -EINVAL;
3447
3448         default:
3449                 DBG(4, "Invalid V4L1 IOCtl: VIDIOC%s "
3450                        "type 0x%01X, "
3451                        "n. 0x%01X, "
3452                        "dir. 0x%01X, "
3453                        "size 0x%02X",
3454                     V4L1_IOCTL(cmd),
3455                     _IOC_TYPE(cmd),_IOC_NR(cmd),_IOC_DIR(cmd),_IOC_SIZE(cmd))
3456
3457                 return -ENOIOCTLCMD;
3458
3459         } /* end of switch */
3460
3461 ioctl_fail:
3462         cam->misconfigured = 1;
3463         DBG(1, "VIDIOC%s failed because of hardware problems. "
3464                "To use the camera, close and open it again.", V4L1_IOCTL(cmd))
3465         return -EFAULT;
3466 }
3467
3468
3469 static struct file_operations w9968cf_fops = {
3470         .owner =   THIS_MODULE,
3471         .open =    w9968cf_open,
3472         .release = w9968cf_release,
3473         .read =    w9968cf_read,
3474         .ioctl =   w9968cf_ioctl,
3475         .compat_ioctl = v4l_compat_ioctl32,
3476         .mmap =    w9968cf_mmap,
3477         .llseek =  no_llseek,
3478 };
3479
3480
3481
3482 /****************************************************************************
3483  * USB probe and V4L registration, disconnect and id_table[] definition     *
3484  ****************************************************************************/
3485
3486 static int
3487 w9968cf_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
3488 {
3489         struct usb_device *udev = interface_to_usbdev(intf);
3490         struct w9968cf_device* cam;
3491         int err = 0;
3492         enum w9968cf_model_id mod_id;
3493         struct list_head* ptr;
3494         u8 sc = 0; /* number of simultaneous cameras */
3495         static unsigned short dev_nr = 0; /* we are handling device number n */
3496
3497         if (le16_to_cpu(udev->descriptor.idVendor)  == winbond_id_table[0].idVendor &&
3498             le16_to_cpu(udev->descriptor.idProduct) == winbond_id_table[0].idProduct)
3499                 mod_id = W9968CF_MOD_CLVBWGP; /* see camlist[] table */
3500         else if (le16_to_cpu(udev->descriptor.idVendor)  == winbond_id_table[1].idVendor &&
3501                  le16_to_cpu(udev->descriptor.idProduct) == winbond_id_table[1].idProduct)
3502                 mod_id = W9968CF_MOD_GENERIC; /* see camlist[] table */
3503         else
3504                 return -ENODEV;
3505
3506         cam = (struct w9968cf_device*)
3507                   kzalloc(sizeof(struct w9968cf_device), GFP_KERNEL);
3508         if (!cam)
3509                 return -ENOMEM;
3510
3511         mutex_init(&cam->dev_mutex);
3512         mutex_lock(&cam->dev_mutex);
3513
3514         cam->usbdev = udev;
3515         /* NOTE: a local copy is used to avoid possible race conditions */
3516         memcpy(&cam->dev, &udev->dev, sizeof(struct device));
3517
3518         DBG(2, "%s detected", symbolic(camlist, mod_id))
3519
3520         if (simcams > W9968CF_MAX_DEVICES)
3521                 simcams = W9968CF_SIMCAMS;
3522
3523         /* How many cameras are connected ? */
3524         mutex_lock(&w9968cf_devlist_mutex);
3525         list_for_each(ptr, &w9968cf_dev_list)
3526                 sc++;
3527         mutex_unlock(&w9968cf_devlist_mutex);
3528
3529         if (sc >= simcams) {
3530                 DBG(2, "Device rejected: too many connected cameras "
3531                        "(max. %u)", simcams)
3532                 err = -EPERM;
3533                 goto fail;
3534         }
3535
3536
3537         /* Allocate 2 bytes of memory for camera control USB transfers */
3538         if (!(cam->control_buffer = kzalloc(2, GFP_KERNEL))) {
3539                 DBG(1,"Couldn't allocate memory for camera control transfers")
3540                 err = -ENOMEM;
3541                 goto fail;
3542         }
3543
3544         /* Allocate 8 bytes of memory for USB data transfers to the FSB */
3545         if (!(cam->data_buffer = kzalloc(8, GFP_KERNEL))) {
3546                 DBG(1, "Couldn't allocate memory for data "
3547                        "transfers to the FSB")
3548                 err = -ENOMEM;
3549                 goto fail;
3550         }
3551
3552         /* Register the V4L device */
3553         cam->v4ldev = video_device_alloc();
3554         if (!cam->v4ldev) {
3555                 DBG(1, "Could not allocate memory for a V4L structure")
3556                 err = -ENOMEM;
3557                 goto fail;
3558         }
3559
3560         strcpy(cam->v4ldev->name, symbolic(camlist, mod_id));
3561         cam->v4ldev->owner = THIS_MODULE;
3562         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
3563         cam->v4ldev->hardware = VID_HARDWARE_W9968CF;
3564         cam->v4ldev->fops = &w9968cf_fops;
3565         cam->v4ldev->minor = video_nr[dev_nr];
3566         cam->v4ldev->release = video_device_release;
3567         video_set_drvdata(cam->v4ldev, cam);
3568         cam->v4ldev->dev = &cam->dev;
3569
3570         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
3571                                     video_nr[dev_nr]);
3572         if (err) {
3573                 DBG(1, "V4L device registration failed")
3574                 if (err == -ENFILE && video_nr[dev_nr] == -1)
3575                         DBG(2, "Couldn't find a free /dev/videoX node")
3576                 video_nr[dev_nr] = -1;
3577                 dev_nr = (dev_nr < W9968CF_MAX_DEVICES-1) ? dev_nr+1 : 0;
3578                 goto fail;
3579         }
3580
3581         DBG(2, "V4L device registered as /dev/video%d", cam->v4ldev->minor)
3582
3583         /* Set some basic constants */
3584         w9968cf_configure_camera(cam, udev, mod_id, dev_nr);
3585
3586         /* Add a new entry into the list of V4L registered devices */
3587         mutex_lock(&w9968cf_devlist_mutex);
3588         list_add(&cam->v4llist, &w9968cf_dev_list);
3589         mutex_unlock(&w9968cf_devlist_mutex);
3590         dev_nr = (dev_nr < W9968CF_MAX_DEVICES-1) ? dev_nr+1 : 0;
3591
3592         w9968cf_turn_on_led(cam);
3593
3594         w9968cf_i2c_init(cam);
3595
3596         usb_set_intfdata(intf, cam);
3597         mutex_unlock(&cam->dev_mutex);
3598         return 0;
3599
3600 fail: /* Free unused memory */
3601         kfree(cam->control_buffer);
3602         kfree(cam->data_buffer);
3603         if (cam->v4ldev)
3604                 video_device_release(cam->v4ldev);
3605         mutex_unlock(&cam->dev_mutex);
3606         kfree(cam);
3607         return err;
3608 }
3609
3610
3611 static void w9968cf_usb_disconnect(struct usb_interface* intf)
3612 {
3613         struct w9968cf_device* cam =
3614            (struct w9968cf_device*)usb_get_intfdata(intf);
3615
3616         down_write(&w9968cf_disconnect);
3617
3618         if (cam) {
3619                 /* Prevent concurrent accesses to data */
3620                 mutex_lock(&cam->dev_mutex);
3621
3622                 cam->disconnected = 1;
3623
3624                 DBG(2, "Disconnecting %s...", symbolic(camlist, cam->id))
3625
3626                 wake_up_interruptible_all(&cam->open);
3627
3628                 if (cam->users) {
3629                         DBG(2, "The device is open (/dev/video%d)! "
3630                                "Process name: %s. Deregistration and memory "
3631                                "deallocation are deferred on close.",
3632                             cam->v4ldev->minor, cam->command)
3633                         cam->misconfigured = 1;
3634                         w9968cf_stop_transfer(cam);
3635                         wake_up_interruptible(&cam->wait_queue);
3636                 } else
3637                         w9968cf_release_resources(cam);
3638
3639                 mutex_unlock(&cam->dev_mutex);
3640
3641                 if (!cam->users)
3642                         kfree(cam);
3643         }
3644
3645         up_write(&w9968cf_disconnect);
3646 }
3647
3648
3649 static struct usb_driver w9968cf_usb_driver = {
3650         .name =       "w9968cf",
3651         .id_table =   winbond_id_table,
3652         .probe =      w9968cf_usb_probe,
3653         .disconnect = w9968cf_usb_disconnect,
3654 };
3655
3656
3657
3658 /****************************************************************************
3659  * Module init, exit and intermodule communication                          *
3660  ****************************************************************************/
3661
3662 static int __init w9968cf_module_init(void)
3663 {
3664         int err;
3665
3666         KDBG(2, W9968CF_MODULE_NAME" "W9968CF_MODULE_VERSION)
3667         KDBG(3, W9968CF_MODULE_AUTHOR)
3668
3669         if (ovmod_load)
3670                 request_module("ovcamchip");
3671
3672         if ((err = usb_register(&w9968cf_usb_driver)))
3673                 return err;
3674
3675         return 0;
3676 }
3677
3678
3679 static void __exit w9968cf_module_exit(void)
3680 {
3681         /* w9968cf_usb_disconnect() will be called */
3682         usb_deregister(&w9968cf_usb_driver);
3683
3684         KDBG(2, W9968CF_MODULE_NAME" deregistered")
3685 }
3686
3687
3688 module_init(w9968cf_module_init);
3689 module_exit(w9968cf_module_exit);
3690