IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / drivers / media / video / sn9c102 / sn9c102_core.c
1 /***************************************************************************
2  * V4L2 driver for SN9C10x PC Camera Controllers                           *
3  *                                                                         *
4  * Copyright (C) 2004-2006 by Luca Risolia <luca.risolia@studio.unibo.it>  *
5  *                                                                         *
6  * This program is free software; you can redistribute it and/or modify    *
7  * it under the terms of the GNU General Public License as published by    *
8  * the Free Software Foundation; either version 2 of the License, or       *
9  * (at your option) any later version.                                     *
10  *                                                                         *
11  * This program is distributed in the hope that it will be useful,         *
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
14  * GNU General Public License for more details.                            *
15  *                                                                         *
16  * You should have received a copy of the GNU General Public License       *
17  * along with this program; if not, write to the Free Software             *
18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
19  ***************************************************************************/
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/param.h>
25 #include <linux/moduleparam.h>
26 #include <linux/errno.h>
27 #include <linux/slab.h>
28 #include <linux/device.h>
29 #include <linux/fs.h>
30 #include <linux/delay.h>
31 #include <linux/compiler.h>
32 #include <linux/ioctl.h>
33 #include <linux/poll.h>
34 #include <linux/stat.h>
35 #include <linux/mm.h>
36 #include <linux/vmalloc.h>
37 #include <linux/page-flags.h>
38 #include <linux/byteorder/generic.h>
39 #include <asm/page.h>
40 #include <asm/uaccess.h>
41
42 #include "sn9c102.h"
43
44 /*****************************************************************************/
45
46 #define SN9C102_MODULE_NAME     "V4L2 driver for SN9C10x PC Camera Controllers"
47 #define SN9C102_MODULE_AUTHOR   "(C) 2004-2006 Luca Risolia"
48 #define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
49 #define SN9C102_MODULE_LICENSE  "GPL"
50 #define SN9C102_MODULE_VERSION  "1:1.27"
51 #define SN9C102_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 27)
52
53 /*****************************************************************************/
54
55 MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
56
57 MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
58 MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
59 MODULE_VERSION(SN9C102_MODULE_VERSION);
60 MODULE_LICENSE(SN9C102_MODULE_LICENSE);
61
62 static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
63 module_param_array(video_nr, short, NULL, 0444);
64 MODULE_PARM_DESC(video_nr,
65                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
66                  "\n -1 = use next available (default)"
67                  "\n  n = use minor number n (integer >= 0)"
68                  "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
69                  " cameras this way."
70                  "\nFor example:"
71                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
72                  "\nthe second camera and use auto for the first"
73                  "\none and for every other camera."
74                  "\n");
75
76 static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
77                                SN9C102_FORCE_MUNMAP};
78 module_param_array(force_munmap, bool, NULL, 0444);
79 MODULE_PARM_DESC(force_munmap,
80                  "\n<0|1[,...]> Force the application to unmap previously"
81                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
82                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
83                  "\nthis feature. This parameter is specific for each"
84                  "\ndetected camera."
85                  "\n 0 = do not force memory unmapping"
86                  "\n 1 = force memory unmapping (save memory)"
87                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
88                  "\n");
89
90 static unsigned int frame_timeout[] = {[0 ... SN9C102_MAX_DEVICES-1] =
91                                        SN9C102_FRAME_TIMEOUT};
92 module_param_array(frame_timeout, uint, NULL, 0644);
93 MODULE_PARM_DESC(frame_timeout,
94                  "\n<n[,...]> Timeout for a video frame in seconds."
95                  "\nThis parameter is specific for each detected camera."
96                  "\nDefault value is "__MODULE_STRING(SN9C102_FRAME_TIMEOUT)"."
97                  "\n");
98
99 #ifdef SN9C102_DEBUG
100 static unsigned short debug = SN9C102_DEBUG_LEVEL;
101 module_param(debug, ushort, 0644);
102 MODULE_PARM_DESC(debug,
103                  "\n<n> Debugging information level, from 0 to 3:"
104                  "\n0 = none (use carefully)"
105                  "\n1 = critical errors"
106                  "\n2 = significant informations"
107                  "\n3 = more verbose messages"
108                  "\nLevel 3 is useful for testing only, when only "
109                  "one device is used."
110                  "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
111                  "\n");
112 #endif
113
114 /*****************************************************************************/
115
116 static sn9c102_sof_header_t sn9c102_sof_header[] = {
117         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x00},
118         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x01},
119 };
120
121 static sn9c103_sof_header_t sn9c103_sof_header[] = {
122         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x20},
123 };
124
125 static sn9c102_eof_header_t sn9c102_eof_header[] = {
126         {0x00, 0x00, 0x00, 0x00},
127         {0x40, 0x00, 0x00, 0x00},
128         {0x80, 0x00, 0x00, 0x00},
129         {0xc0, 0x00, 0x00, 0x00},
130 };
131
132 /*****************************************************************************/
133
134 static u32
135 sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
136                         enum sn9c102_io_method io)
137 {
138         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
139         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
140         const size_t imagesize = cam->module_param.force_munmap ||
141                                  io == IO_READ ?
142                                  (p->width * p->height * p->priv) / 8 :
143                                  (r->width * r->height * p->priv) / 8;
144         void* buff = NULL;
145         u32 i;
146
147         if (count > SN9C102_MAX_FRAMES)
148                 count = SN9C102_MAX_FRAMES;
149
150         cam->nbuffers = count;
151         while (cam->nbuffers > 0) {
152                 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
153                         break;
154                 cam->nbuffers--;
155         }
156
157         for (i = 0; i < cam->nbuffers; i++) {
158                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
159                 cam->frame[i].buf.index = i;
160                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
161                 cam->frame[i].buf.length = imagesize;
162                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
163                 cam->frame[i].buf.sequence = 0;
164                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
165                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
166                 cam->frame[i].buf.flags = 0;
167         }
168
169         return cam->nbuffers;
170 }
171
172
173 static void sn9c102_release_buffers(struct sn9c102_device* cam)
174 {
175         if (cam->nbuffers) {
176                 vfree(cam->frame[0].bufmem);
177                 cam->nbuffers = 0;
178         }
179         cam->frame_current = NULL;
180 }
181
182
183 static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
184 {
185         u32 i;
186
187         INIT_LIST_HEAD(&cam->inqueue);
188         INIT_LIST_HEAD(&cam->outqueue);
189
190         for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
191                 cam->frame[i].state = F_UNUSED;
192                 cam->frame[i].buf.bytesused = 0;
193         }
194 }
195
196
197 static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
198 {
199         struct sn9c102_frame_t *i;
200
201         list_for_each_entry(i, &cam->outqueue, frame) {
202                 i->state = F_QUEUED;
203                 list_add(&i->frame, &cam->inqueue);
204         }
205
206         INIT_LIST_HEAD(&cam->outqueue);
207 }
208
209
210 static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
211 {
212         unsigned long lock_flags;
213         u32 i;
214
215         for (i = 0; i < cam->nbuffers; i++)
216                 if (cam->frame[i].state == F_UNUSED) {
217                         cam->frame[i].state = F_QUEUED;
218                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
219                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
220                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
221                 }
222 }
223
224 /*****************************************************************************/
225
226 int sn9c102_write_regs(struct sn9c102_device* cam, u8* buff, u16 index)
227 {
228         struct usb_device* udev = cam->usbdev;
229         int i, res;
230
231         if (index + sizeof(buff) >= ARRAY_SIZE(cam->reg))
232                 return -1;
233
234         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
235                               index, 0, buff, sizeof(buff),
236                               SN9C102_CTRL_TIMEOUT*sizeof(buff));
237         if (res < 0) {
238                 DBG(3, "Failed to write registers (index 0x%02X, error %d)",
239                     index, res);
240                 return -1;
241         }
242
243         for (i = 0; i < sizeof(buff); i++)
244                 cam->reg[index+i] = buff[i];
245
246         return 0;
247 }
248
249
250 int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
251 {
252         struct usb_device* udev = cam->usbdev;
253         u8* buff = cam->control_buffer;
254         int res;
255
256         if (index >= ARRAY_SIZE(cam->reg))
257                 return -1;
258
259         *buff = value;
260
261         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
262                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
263         if (res < 0) {
264                 DBG(3, "Failed to write a register (value 0x%02X, index "
265                        "0x%02X, error %d)", value, index, res);
266                 return -1;
267         }
268
269         cam->reg[index] = value;
270
271         return 0;
272 }
273
274
275 /* NOTE: reading some registers always returns 0 */
276 static int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
277 {
278         struct usb_device* udev = cam->usbdev;
279         u8* buff = cam->control_buffer;
280         int res;
281
282         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
283                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
284         if (res < 0)
285                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
286                     index, res);
287
288         return (res >= 0) ? (int)(*buff) : -1;
289 }
290
291
292 int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
293 {
294         if (index >= ARRAY_SIZE(cam->reg))
295                 return -1;
296
297         return cam->reg[index];
298 }
299
300
301 static int
302 sn9c102_i2c_wait(struct sn9c102_device* cam, struct sn9c102_sensor* sensor)
303 {
304         int i, r;
305
306         for (i = 1; i <= 5; i++) {
307                 r = sn9c102_read_reg(cam, 0x08);
308                 if (r < 0)
309                         return -EIO;
310                 if (r & 0x04)
311                         return 0;
312                 if (sensor->frequency & SN9C102_I2C_400KHZ)
313                         udelay(5*16);
314                 else
315                         udelay(16*16);
316         }
317         return -EBUSY;
318 }
319
320
321 static int
322 sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
323                               struct sn9c102_sensor* sensor)
324 {
325         int r;
326         r = sn9c102_read_reg(cam, 0x08);
327         return (r < 0 || (r >= 0 && !(r & 0x08))) ? -EIO : 0;
328 }
329
330
331 static int
332 sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
333                                struct sn9c102_sensor* sensor)
334 {
335         int r;
336         r = sn9c102_read_reg(cam, 0x08);
337         return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
338 }
339
340
341 int
342 sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
343                          struct sn9c102_sensor* sensor, u8 data0, u8 data1,
344                          u8 n, u8 buffer[])
345 {
346         struct usb_device* udev = cam->usbdev;
347         u8* data = cam->control_buffer;
348         int err = 0, res;
349
350         /* Write cycle */
351         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
352                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
353         data[1] = data0; /* I2C slave id */
354         data[2] = data1; /* address */
355         data[7] = 0x10;
356         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
357                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
358         if (res < 0)
359                 err += res;
360
361         err += sn9c102_i2c_wait(cam, sensor);
362
363         /* Read cycle - n bytes */
364         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
365                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
366                   (n << 4) | 0x02;
367         data[1] = data0;
368         data[7] = 0x10;
369         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
370                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
371         if (res < 0)
372                 err += res;
373
374         err += sn9c102_i2c_wait(cam, sensor);
375
376         /* The first read byte will be placed in data[4] */
377         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
378                               0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
379         if (res < 0)
380                 err += res;
381
382         err += sn9c102_i2c_detect_read_error(cam, sensor);
383
384         PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
385               data[4]);
386
387         if (err) {
388                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
389                 return -1;
390         }
391
392         if (buffer)
393                 memcpy(buffer, data, sizeof(buffer));
394
395         return (int)data[4];
396 }
397
398
399 int
400 sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
401                           struct sn9c102_sensor* sensor, u8 n, u8 data0,
402                           u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
403 {
404         struct usb_device* udev = cam->usbdev;
405         u8* data = cam->control_buffer;
406         int err = 0, res;
407
408         /* Write cycle. It usually is address + value */
409         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
410                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
411                   | ((n - 1) << 4);
412         data[1] = data0;
413         data[2] = data1;
414         data[3] = data2;
415         data[4] = data3;
416         data[5] = data4;
417         data[6] = data5;
418         data[7] = 0x14;
419         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
420                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
421         if (res < 0)
422                 err += res;
423
424         err += sn9c102_i2c_wait(cam, sensor);
425         err += sn9c102_i2c_detect_write_error(cam, sensor);
426
427         if (err)
428                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
429
430         PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
431               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
432               n, data0, data1, data2, data3, data4, data5);
433
434         return err ? -1 : 0;
435 }
436
437
438 int
439 sn9c102_i2c_try_read(struct sn9c102_device* cam,
440                      struct sn9c102_sensor* sensor, u8 address)
441 {
442         return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
443                                         address, 1, NULL);
444 }
445
446
447 int
448 sn9c102_i2c_try_write(struct sn9c102_device* cam,
449                       struct sn9c102_sensor* sensor, u8 address, u8 value)
450 {
451         return sn9c102_i2c_try_raw_write(cam, sensor, 3,
452                                          sensor->i2c_slave_id, address,
453                                          value, 0, 0, 0);
454 }
455
456
457 int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
458 {
459         return sn9c102_i2c_try_read(cam, &cam->sensor, address);
460 }
461
462
463 int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
464 {
465         return sn9c102_i2c_try_write(cam, &cam->sensor, address, value);
466 }
467
468 /*****************************************************************************/
469
470 static void*
471 sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
472 {
473         size_t soflen = 0, i;
474         u8 j, n = 0;
475
476         switch (cam->bridge) {
477         case BRIDGE_SN9C101:
478         case BRIDGE_SN9C102:
479                 soflen = sizeof(sn9c102_sof_header_t);
480                 n = sizeof(sn9c102_sof_header) / soflen;
481                 break;
482         case BRIDGE_SN9C103:
483                 soflen = sizeof(sn9c103_sof_header_t);
484                 n = sizeof(sn9c103_sof_header) / soflen;
485         }
486
487         for (i = 0; (len >= soflen) && (i <= len - soflen); i++)
488                 for (j = 0; j < n; j++)
489                         /* The invariable part of the header is 6 bytes long */
490                         if ((cam->bridge != BRIDGE_SN9C103 &&
491                             !memcmp(mem + i, sn9c102_sof_header[j], 6)) ||
492                             (cam->bridge == BRIDGE_SN9C103 &&
493                             !memcmp(mem + i, sn9c103_sof_header[j], 6))) {
494                                 memcpy(cam->sof_header, mem + i, soflen);
495                                 /* Skip the header */
496                                 return mem + i + soflen;
497                         }
498
499         return NULL;
500 }
501
502
503 static void*
504 sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
505 {
506         size_t eoflen = sizeof(sn9c102_eof_header_t), i;
507         unsigned j, n = sizeof(sn9c102_eof_header) / eoflen;
508
509         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
510                 return NULL; /* EOF header does not exist in compressed data */
511
512         for (i = 0; (len >= eoflen) && (i <= len - eoflen); i++)
513                 for (j = 0; j < n; j++)
514                         if (!memcmp(mem + i, sn9c102_eof_header[j], eoflen))
515                                 return mem + i;
516
517         return NULL;
518 }
519
520
521 static void sn9c102_urb_complete(struct urb *urb)
522 {
523         struct sn9c102_device* cam = urb->context;
524         struct sn9c102_frame_t** f;
525         size_t imagesize, soflen;
526         u8 i;
527         int err = 0;
528
529         if (urb->status == -ENOENT)
530                 return;
531
532         f = &cam->frame_current;
533
534         if (cam->stream == STREAM_INTERRUPT) {
535                 cam->stream = STREAM_OFF;
536                 if ((*f))
537                         (*f)->state = F_QUEUED;
538                 DBG(3, "Stream interrupted");
539                 wake_up(&cam->wait_stream);
540         }
541
542         if (cam->state & DEV_DISCONNECTED)
543                 return;
544
545         if (cam->state & DEV_MISCONFIGURED) {
546                 wake_up_interruptible(&cam->wait_frame);
547                 return;
548         }
549
550         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
551                 goto resubmit_urb;
552
553         if (!(*f))
554                 (*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
555                                   frame);
556
557         imagesize = (cam->sensor.pix_format.width *
558                      cam->sensor.pix_format.height *
559                      cam->sensor.pix_format.priv) / 8;
560
561         soflen = (cam->bridge) == BRIDGE_SN9C103 ?
562                                   sizeof(sn9c103_sof_header_t) :
563                                   sizeof(sn9c102_sof_header_t);
564
565         for (i = 0; i < urb->number_of_packets; i++) {
566                 unsigned int img, len, status;
567                 void *pos, *sof, *eof;
568
569                 len = urb->iso_frame_desc[i].actual_length;
570                 status = urb->iso_frame_desc[i].status;
571                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
572
573                 if (status) {
574                         DBG(3, "Error in isochronous frame");
575                         (*f)->state = F_ERROR;
576                         continue;
577                 }
578
579                 PDBGG("Isochrnous frame: length %u, #%u i", len, i);
580
581 redo:
582                 sof = sn9c102_find_sof_header(cam, pos, len);
583                 if (likely(!sof)) {
584                         eof = sn9c102_find_eof_header(cam, pos, len);
585                         if ((*f)->state == F_GRABBING) {
586 end_of_frame:
587                                 img = len;
588
589                                 if (eof)
590                                         img = (eof > pos) ? eof - pos - 1 : 0;
591
592                                 if ((*f)->buf.bytesused+img > imagesize) {
593                                         u32 b;
594                                         b = (*f)->buf.bytesused + img -
595                                             imagesize;
596                                         img = imagesize - (*f)->buf.bytesused;
597                                         DBG(3, "Expected EOF not found: "
598                                                "video frame cut");
599                                         if (eof)
600                                                 DBG(3, "Exceeded limit: +%u "
601                                                        "bytes", (unsigned)(b));
602                                 }
603
604                                 memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
605                                        img);
606
607                                 if ((*f)->buf.bytesused == 0)
608                                         do_gettimeofday(&(*f)->buf.timestamp);
609
610                                 (*f)->buf.bytesused += img;
611
612                                 if ((*f)->buf.bytesused == imagesize ||
613                                     (cam->sensor.pix_format.pixelformat ==
614                                                 V4L2_PIX_FMT_SN9C10X && eof)) {
615                                         u32 b;
616                                         b = (*f)->buf.bytesused;
617                                         (*f)->state = F_DONE;
618                                         (*f)->buf.sequence= ++cam->frame_count;
619                                         spin_lock(&cam->queue_lock);
620                                         list_move_tail(&(*f)->frame,
621                                                        &cam->outqueue);
622                                         if (!list_empty(&cam->inqueue))
623                                                 (*f) = list_entry(
624                                                         cam->inqueue.next,
625                                                         struct sn9c102_frame_t,
626                                                         frame );
627                                         else
628                                                 (*f) = NULL;
629                                         spin_unlock(&cam->queue_lock);
630                                         memcpy(cam->sysfs.frame_header,
631                                                cam->sof_header, soflen);
632                                         DBG(3, "Video frame captured: %lu "
633                                                "bytes", (unsigned long)(b));
634
635                                         if (!(*f))
636                                                 goto resubmit_urb;
637
638                                 } else if (eof) {
639                                         (*f)->state = F_ERROR;
640                                         DBG(3, "Not expected EOF after %lu "
641                                                "bytes of image data",
642                                             (unsigned long)
643                                             ((*f)->buf.bytesused));
644                                 }
645
646                                 if (sof) /* (1) */
647                                         goto start_of_frame;
648
649                         } else if (eof) {
650                                 DBG(3, "EOF without SOF");
651                                 continue;
652
653                         } else {
654                                 PDBGG("Ignoring pointless isochronous frame");
655                                 continue;
656                         }
657
658                 } else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
659 start_of_frame:
660                         (*f)->state = F_GRABBING;
661                         (*f)->buf.bytesused = 0;
662                         len -= (sof - pos);
663                         pos = sof;
664                         DBG(3, "SOF detected: new video frame");
665                         if (len)
666                                 goto redo;
667
668                 } else if ((*f)->state == F_GRABBING) {
669                         eof = sn9c102_find_eof_header(cam, pos, len);
670                         if (eof && eof < sof)
671                                 goto end_of_frame; /* (1) */
672                         else {
673                                 if (cam->sensor.pix_format.pixelformat ==
674                                     V4L2_PIX_FMT_SN9C10X) {
675                                         eof = sof - soflen;
676                                         goto end_of_frame;
677                                 } else {
678                                         DBG(3, "SOF before expected EOF after "
679                                                "%lu bytes of image data",
680                                             (unsigned long)
681                                             ((*f)->buf.bytesused));
682                                         goto start_of_frame;
683                                 }
684                         }
685                 }
686         }
687
688 resubmit_urb:
689         urb->dev = cam->usbdev;
690         err = usb_submit_urb(urb, GFP_ATOMIC);
691         if (err < 0 && err != -EPERM) {
692                 cam->state |= DEV_MISCONFIGURED;
693                 DBG(1, "usb_submit_urb() failed");
694         }
695
696         wake_up_interruptible(&cam->wait_frame);
697 }
698
699
700 static int sn9c102_start_transfer(struct sn9c102_device* cam)
701 {
702         struct usb_device *udev = cam->usbdev;
703         struct urb* urb;
704         const unsigned int sn9c102_wMaxPacketSize[] = {0, 128, 256, 384, 512,
705                                                        680, 800, 900, 1023};
706         const unsigned int sn9c103_wMaxPacketSize[] = {0, 128, 256, 384, 512,
707                                                        680, 800, 900, 1003};
708         const unsigned int psz = (cam->bridge == BRIDGE_SN9C103) ?
709                             sn9c103_wMaxPacketSize[SN9C102_ALTERNATE_SETTING] :
710                             sn9c102_wMaxPacketSize[SN9C102_ALTERNATE_SETTING];
711         s8 i, j;
712         int err = 0;
713
714         for (i = 0; i < SN9C102_URBS; i++) {
715                 cam->transfer_buffer[i] = kzalloc(SN9C102_ISO_PACKETS * psz,
716                                                   GFP_KERNEL);
717                 if (!cam->transfer_buffer[i]) {
718                         err = -ENOMEM;
719                         DBG(1, "Not enough memory");
720                         goto free_buffers;
721                 }
722         }
723
724         for (i = 0; i < SN9C102_URBS; i++) {
725                 urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
726                 cam->urb[i] = urb;
727                 if (!urb) {
728                         err = -ENOMEM;
729                         DBG(1, "usb_alloc_urb() failed");
730                         goto free_urbs;
731                 }
732                 urb->dev = udev;
733                 urb->context = cam;
734                 urb->pipe = usb_rcvisocpipe(udev, 1);
735                 urb->transfer_flags = URB_ISO_ASAP;
736                 urb->number_of_packets = SN9C102_ISO_PACKETS;
737                 urb->complete = sn9c102_urb_complete;
738                 urb->transfer_buffer = cam->transfer_buffer[i];
739                 urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
740                 urb->interval = 1;
741                 for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
742                         urb->iso_frame_desc[j].offset = psz * j;
743                         urb->iso_frame_desc[j].length = psz;
744                 }
745         }
746
747         /* Enable video */
748         if (!(cam->reg[0x01] & 0x04)) {
749                 err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
750                 if (err) {
751                         err = -EIO;
752                         DBG(1, "I/O hardware error");
753                         goto free_urbs;
754                 }
755         }
756
757         err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
758         if (err) {
759                 DBG(1, "usb_set_interface() failed");
760                 goto free_urbs;
761         }
762
763         cam->frame_current = NULL;
764
765         for (i = 0; i < SN9C102_URBS; i++) {
766                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
767                 if (err) {
768                         for (j = i-1; j >= 0; j--)
769                                 usb_kill_urb(cam->urb[j]);
770                         DBG(1, "usb_submit_urb() failed, error %d", err);
771                         goto free_urbs;
772                 }
773         }
774
775         return 0;
776
777 free_urbs:
778         for (i = 0; (i < SN9C102_URBS) &&  cam->urb[i]; i++)
779                 usb_free_urb(cam->urb[i]);
780
781 free_buffers:
782         for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
783                 kfree(cam->transfer_buffer[i]);
784
785         return err;
786 }
787
788
789 static int sn9c102_stop_transfer(struct sn9c102_device* cam)
790 {
791         struct usb_device *udev = cam->usbdev;
792         s8 i;
793         int err = 0;
794
795         if (cam->state & DEV_DISCONNECTED)
796                 return 0;
797
798         for (i = SN9C102_URBS-1; i >= 0; i--) {
799                 usb_kill_urb(cam->urb[i]);
800                 usb_free_urb(cam->urb[i]);
801                 kfree(cam->transfer_buffer[i]);
802         }
803
804         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
805         if (err)
806                 DBG(3, "usb_set_interface() failed");
807
808         return err;
809 }
810
811
812 static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
813 {
814         long timeout;
815
816         cam->stream = STREAM_INTERRUPT;
817         timeout = wait_event_timeout(cam->wait_stream,
818                                      (cam->stream == STREAM_OFF) ||
819                                      (cam->state & DEV_DISCONNECTED),
820                                      SN9C102_URB_TIMEOUT);
821         if (cam->state & DEV_DISCONNECTED)
822                 return -ENODEV;
823         else if (cam->stream != STREAM_OFF) {
824                 cam->state |= DEV_MISCONFIGURED;
825                 DBG(1, "URB timeout reached. The camera is misconfigured. "
826                        "To use it, close and open /dev/video%d again.",
827                     cam->v4ldev->minor);
828                 return -EIO;
829         }
830
831         return 0;
832 }
833
834 /*****************************************************************************/
835
836 #ifdef CONFIG_VIDEO_ADV_DEBUG
837 static u8 sn9c102_strtou8(const char* buff, size_t len, ssize_t* count)
838 {
839         char str[5];
840         char* endp;
841         unsigned long val;
842
843         if (len < 4) {
844                 strncpy(str, buff, len);
845                 str[len+1] = '\0';
846         } else {
847                 strncpy(str, buff, 4);
848                 str[4] = '\0';
849         }
850
851         val = simple_strtoul(str, &endp, 0);
852
853         *count = 0;
854         if (val <= 0xff)
855                 *count = (ssize_t)(endp - str);
856         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
857                 *count += 1;
858
859         return (u8)val;
860 }
861
862 /*
863    NOTE 1: being inside one of the following methods implies that the v4l
864            device exists for sure (see kobjects and reference counters)
865    NOTE 2: buffers are PAGE_SIZE long
866 */
867
868 static ssize_t sn9c102_show_reg(struct class_device* cd, char* buf)
869 {
870         struct sn9c102_device* cam;
871         ssize_t count;
872
873         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
874                 return -ERESTARTSYS;
875
876         cam = video_get_drvdata(to_video_device(cd));
877         if (!cam) {
878                 mutex_unlock(&sn9c102_sysfs_lock);
879                 return -ENODEV;
880         }
881
882         count = sprintf(buf, "%u\n", cam->sysfs.reg);
883
884         mutex_unlock(&sn9c102_sysfs_lock);
885
886         return count;
887 }
888
889
890 static ssize_t
891 sn9c102_store_reg(struct class_device* cd, const char* buf, size_t len)
892 {
893         struct sn9c102_device* cam;
894         u8 index;
895         ssize_t count;
896
897         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
898                 return -ERESTARTSYS;
899
900         cam = video_get_drvdata(to_video_device(cd));
901         if (!cam) {
902                 mutex_unlock(&sn9c102_sysfs_lock);
903                 return -ENODEV;
904         }
905
906         index = sn9c102_strtou8(buf, len, &count);
907         if (index > 0x1f || !count) {
908                 mutex_unlock(&sn9c102_sysfs_lock);
909                 return -EINVAL;
910         }
911
912         cam->sysfs.reg = index;
913
914         DBG(2, "Moved SN9C10X register index to 0x%02X", cam->sysfs.reg);
915         DBG(3, "Written bytes: %zd", count);
916
917         mutex_unlock(&sn9c102_sysfs_lock);
918
919         return count;
920 }
921
922
923 static ssize_t sn9c102_show_val(struct class_device* cd, char* buf)
924 {
925         struct sn9c102_device* cam;
926         ssize_t count;
927         int val;
928
929         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
930                 return -ERESTARTSYS;
931
932         cam = video_get_drvdata(to_video_device(cd));
933         if (!cam) {
934                 mutex_unlock(&sn9c102_sysfs_lock);
935                 return -ENODEV;
936         }
937
938         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
939                 mutex_unlock(&sn9c102_sysfs_lock);
940                 return -EIO;
941         }
942
943         count = sprintf(buf, "%d\n", val);
944
945         DBG(3, "Read bytes: %zd", count);
946
947         mutex_unlock(&sn9c102_sysfs_lock);
948
949         return count;
950 }
951
952
953 static ssize_t
954 sn9c102_store_val(struct class_device* cd, const char* buf, size_t len)
955 {
956         struct sn9c102_device* cam;
957         u8 value;
958         ssize_t count;
959         int err;
960
961         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
962                 return -ERESTARTSYS;
963
964         cam = video_get_drvdata(to_video_device(cd));
965         if (!cam) {
966                 mutex_unlock(&sn9c102_sysfs_lock);
967                 return -ENODEV;
968         }
969
970         value = sn9c102_strtou8(buf, len, &count);
971         if (!count) {
972                 mutex_unlock(&sn9c102_sysfs_lock);
973                 return -EINVAL;
974         }
975
976         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
977         if (err) {
978                 mutex_unlock(&sn9c102_sysfs_lock);
979                 return -EIO;
980         }
981
982         DBG(2, "Written SN9C10X reg. 0x%02X, val. 0x%02X",
983             cam->sysfs.reg, value);
984         DBG(3, "Written bytes: %zd", count);
985
986         mutex_unlock(&sn9c102_sysfs_lock);
987
988         return count;
989 }
990
991
992 static ssize_t sn9c102_show_i2c_reg(struct class_device* cd, char* buf)
993 {
994         struct sn9c102_device* cam;
995         ssize_t count;
996
997         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
998                 return -ERESTARTSYS;
999
1000         cam = video_get_drvdata(to_video_device(cd));
1001         if (!cam) {
1002                 mutex_unlock(&sn9c102_sysfs_lock);
1003                 return -ENODEV;
1004         }
1005
1006         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1007
1008         DBG(3, "Read bytes: %zd", count);
1009
1010         mutex_unlock(&sn9c102_sysfs_lock);
1011
1012         return count;
1013 }
1014
1015
1016 static ssize_t
1017 sn9c102_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
1018 {
1019         struct sn9c102_device* cam;
1020         u8 index;
1021         ssize_t count;
1022
1023         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1024                 return -ERESTARTSYS;
1025
1026         cam = video_get_drvdata(to_video_device(cd));
1027         if (!cam) {
1028                 mutex_unlock(&sn9c102_sysfs_lock);
1029                 return -ENODEV;
1030         }
1031
1032         index = sn9c102_strtou8(buf, len, &count);
1033         if (!count) {
1034                 mutex_unlock(&sn9c102_sysfs_lock);
1035                 return -EINVAL;
1036         }
1037
1038         cam->sysfs.i2c_reg = index;
1039
1040         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1041         DBG(3, "Written bytes: %zd", count);
1042
1043         mutex_unlock(&sn9c102_sysfs_lock);
1044
1045         return count;
1046 }
1047
1048
1049 static ssize_t sn9c102_show_i2c_val(struct class_device* cd, char* buf)
1050 {
1051         struct sn9c102_device* cam;
1052         ssize_t count;
1053         int val;
1054
1055         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1056                 return -ERESTARTSYS;
1057
1058         cam = video_get_drvdata(to_video_device(cd));
1059         if (!cam) {
1060                 mutex_unlock(&sn9c102_sysfs_lock);
1061                 return -ENODEV;
1062         }
1063
1064         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
1065                 mutex_unlock(&sn9c102_sysfs_lock);
1066                 return -ENOSYS;
1067         }
1068
1069         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1070                 mutex_unlock(&sn9c102_sysfs_lock);
1071                 return -EIO;
1072         }
1073
1074         count = sprintf(buf, "%d\n", val);
1075
1076         DBG(3, "Read bytes: %zd", count);
1077
1078         mutex_unlock(&sn9c102_sysfs_lock);
1079
1080         return count;
1081 }
1082
1083
1084 static ssize_t
1085 sn9c102_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
1086 {
1087         struct sn9c102_device* cam;
1088         u8 value;
1089         ssize_t count;
1090         int err;
1091
1092         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1093                 return -ERESTARTSYS;
1094
1095         cam = video_get_drvdata(to_video_device(cd));
1096         if (!cam) {
1097                 mutex_unlock(&sn9c102_sysfs_lock);
1098                 return -ENODEV;
1099         }
1100
1101         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
1102                 mutex_unlock(&sn9c102_sysfs_lock);
1103                 return -ENOSYS;
1104         }
1105
1106         value = sn9c102_strtou8(buf, len, &count);
1107         if (!count) {
1108                 mutex_unlock(&sn9c102_sysfs_lock);
1109                 return -EINVAL;
1110         }
1111
1112         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1113         if (err) {
1114                 mutex_unlock(&sn9c102_sysfs_lock);
1115                 return -EIO;
1116         }
1117
1118         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1119             cam->sysfs.i2c_reg, value);
1120         DBG(3, "Written bytes: %zd", count);
1121
1122         mutex_unlock(&sn9c102_sysfs_lock);
1123
1124         return count;
1125 }
1126
1127
1128 static ssize_t
1129 sn9c102_store_green(struct class_device* cd, const char* buf, size_t len)
1130 {
1131         struct sn9c102_device* cam;
1132         enum sn9c102_bridge bridge;
1133         ssize_t res = 0;
1134         u8 value;
1135         ssize_t count;
1136
1137         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1138                 return -ERESTARTSYS;
1139
1140         cam = video_get_drvdata(to_video_device(cd));
1141         if (!cam) {
1142                 mutex_unlock(&sn9c102_sysfs_lock);
1143                 return -ENODEV;
1144         }
1145
1146         bridge = cam->bridge;
1147
1148         mutex_unlock(&sn9c102_sysfs_lock);
1149
1150         value = sn9c102_strtou8(buf, len, &count);
1151         if (!count)
1152                 return -EINVAL;
1153
1154         switch (bridge) {
1155         case BRIDGE_SN9C101:
1156         case BRIDGE_SN9C102:
1157                 if (value > 0x0f)
1158                         return -EINVAL;
1159                 if ((res = sn9c102_store_reg(cd, "0x11", 4)) >= 0)
1160                         res = sn9c102_store_val(cd, buf, len);
1161                 break;
1162         case BRIDGE_SN9C103:
1163                 if (value > 0x7f)
1164                         return -EINVAL;
1165                 if ((res = sn9c102_store_reg(cd, "0x04", 4)) >= 0)
1166                         res = sn9c102_store_val(cd, buf, len);
1167                 break;
1168         }
1169
1170         return res;
1171 }
1172
1173
1174 static ssize_t
1175 sn9c102_store_blue(struct class_device* cd, const char* buf, size_t len)
1176 {
1177         ssize_t res = 0;
1178         u8 value;
1179         ssize_t count;
1180
1181         value = sn9c102_strtou8(buf, len, &count);
1182         if (!count || value > 0x7f)
1183                 return -EINVAL;
1184
1185         if ((res = sn9c102_store_reg(cd, "0x06", 4)) >= 0)
1186                 res = sn9c102_store_val(cd, buf, len);
1187
1188         return res;
1189 }
1190
1191
1192 static ssize_t
1193 sn9c102_store_red(struct class_device* cd, const char* buf, size_t len)
1194 {
1195         ssize_t res = 0;
1196         u8 value;
1197         ssize_t count;
1198
1199         value = sn9c102_strtou8(buf, len, &count);
1200         if (!count || value > 0x7f)
1201                 return -EINVAL;
1202
1203         if ((res = sn9c102_store_reg(cd, "0x05", 4)) >= 0)
1204                 res = sn9c102_store_val(cd, buf, len);
1205
1206         return res;
1207 }
1208
1209
1210 static ssize_t sn9c102_show_frame_header(struct class_device* cd, char* buf)
1211 {
1212         struct sn9c102_device* cam;
1213         ssize_t count;
1214
1215         cam = video_get_drvdata(to_video_device(cd));
1216         if (!cam)
1217                 return -ENODEV;
1218
1219         count = sizeof(cam->sysfs.frame_header);
1220         memcpy(buf, cam->sysfs.frame_header, count);
1221
1222         DBG(3, "Frame header, read bytes: %zd", count);
1223
1224         return count;
1225 }
1226
1227
1228 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
1229                          sn9c102_show_reg, sn9c102_store_reg);
1230 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
1231                          sn9c102_show_val, sn9c102_store_val);
1232 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1233                          sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1234 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1235                          sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1236 static CLASS_DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
1237 static CLASS_DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
1238 static CLASS_DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
1239 static CLASS_DEVICE_ATTR(frame_header, S_IRUGO,
1240                          sn9c102_show_frame_header, NULL);
1241
1242
1243 static void sn9c102_create_sysfs(struct sn9c102_device* cam)
1244 {
1245         struct video_device *v4ldev = cam->v4ldev;
1246
1247         video_device_create_file(v4ldev, &class_device_attr_reg);
1248         video_device_create_file(v4ldev, &class_device_attr_val);
1249         video_device_create_file(v4ldev, &class_device_attr_frame_header);
1250         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
1251                 video_device_create_file(v4ldev, &class_device_attr_green);
1252         else if (cam->bridge == BRIDGE_SN9C103) {
1253                 video_device_create_file(v4ldev, &class_device_attr_blue);
1254                 video_device_create_file(v4ldev, &class_device_attr_red);
1255         }
1256         if (cam->sensor.sysfs_ops) {
1257                 video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
1258                 video_device_create_file(v4ldev, &class_device_attr_i2c_val);
1259         }
1260 }
1261 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1262
1263 /*****************************************************************************/
1264
1265 static int
1266 sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
1267 {
1268         int err = 0;
1269
1270         if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
1271                 err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80, 0x18);
1272         else
1273                 err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f, 0x18);
1274
1275         return err ? -EIO : 0;
1276 }
1277
1278
1279 static int
1280 sn9c102_set_compression(struct sn9c102_device* cam,
1281                         struct v4l2_jpegcompression* compression)
1282 {
1283         int err = 0;
1284
1285         if (compression->quality == 0)
1286                 err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01, 0x17);
1287         else if (compression->quality == 1)
1288                 err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe, 0x17);
1289
1290         return err ? -EIO : 0;
1291 }
1292
1293
1294 static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
1295 {
1296         u8 r = 0;
1297         int err = 0;
1298
1299         if (scale == 1)
1300                 r = cam->reg[0x18] & 0xcf;
1301         else if (scale == 2) {
1302                 r = cam->reg[0x18] & 0xcf;
1303                 r |= 0x10;
1304         } else if (scale == 4)
1305                 r = cam->reg[0x18] | 0x20;
1306
1307         err += sn9c102_write_reg(cam, r, 0x18);
1308         if (err)
1309                 return -EIO;
1310
1311         PDBGG("Scaling factor: %u", scale);
1312
1313         return 0;
1314 }
1315
1316
1317 static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
1318 {
1319         struct sn9c102_sensor* s = &cam->sensor;
1320         u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
1321            v_start = (u8)(rect->top - s->cropcap.bounds.top),
1322            h_size = (u8)(rect->width / 16),
1323            v_size = (u8)(rect->height / 16);
1324         int err = 0;
1325
1326         err += sn9c102_write_reg(cam, h_start, 0x12);
1327         err += sn9c102_write_reg(cam, v_start, 0x13);
1328         err += sn9c102_write_reg(cam, h_size, 0x15);
1329         err += sn9c102_write_reg(cam, v_size, 0x16);
1330         if (err)
1331                 return -EIO;
1332
1333         PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
1334               "%u %u %u %u", h_start, v_start, h_size, v_size);
1335
1336         return 0;
1337 }
1338
1339
1340 static int sn9c102_init(struct sn9c102_device* cam)
1341 {
1342         struct sn9c102_sensor* s = &cam->sensor;
1343         struct v4l2_control ctrl;
1344         struct v4l2_queryctrl *qctrl;
1345         struct v4l2_rect* rect;
1346         u8 i = 0;
1347         int err = 0;
1348
1349         if (!(cam->state & DEV_INITIALIZED)) {
1350                 init_waitqueue_head(&cam->open);
1351                 qctrl = s->qctrl;
1352                 rect = &(s->cropcap.defrect);
1353         } else { /* use current values */
1354                 qctrl = s->_qctrl;
1355                 rect = &(s->_rect);
1356         }
1357
1358         err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
1359         err += sn9c102_set_crop(cam, rect);
1360         if (err)
1361                 return err;
1362
1363         if (s->init) {
1364                 err = s->init(cam);
1365                 if (err) {
1366                         DBG(3, "Sensor initialization failed");
1367                         return err;
1368                 }
1369         }
1370
1371         if (!(cam->state & DEV_INITIALIZED))
1372                 cam->compression.quality =  cam->reg[0x17] & 0x01 ? 0 : 1;
1373         else
1374                 err += sn9c102_set_compression(cam, &cam->compression);
1375         err += sn9c102_set_pix_format(cam, &s->pix_format);
1376         if (s->set_pix_format)
1377                 err += s->set_pix_format(cam, &s->pix_format);
1378         if (err)
1379                 return err;
1380
1381         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
1382                 DBG(3, "Compressed video format is active, quality %d",
1383                     cam->compression.quality);
1384         else
1385                 DBG(3, "Uncompressed video format is active");
1386
1387         if (s->set_crop)
1388                 if ((err = s->set_crop(cam, rect))) {
1389                         DBG(3, "set_crop() failed");
1390                         return err;
1391                 }
1392
1393         if (s->set_ctrl) {
1394                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1395                         if (s->qctrl[i].id != 0 &&
1396                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1397                                 ctrl.id = s->qctrl[i].id;
1398                                 ctrl.value = qctrl[i].default_value;
1399                                 err = s->set_ctrl(cam, &ctrl);
1400                                 if (err) {
1401                                         DBG(3, "Set %s control failed",
1402                                             s->qctrl[i].name);
1403                                         return err;
1404                                 }
1405                                 DBG(3, "Image sensor supports '%s' control",
1406                                     s->qctrl[i].name);
1407                         }
1408         }
1409
1410         if (!(cam->state & DEV_INITIALIZED)) {
1411                 mutex_init(&cam->fileop_mutex);
1412                 spin_lock_init(&cam->queue_lock);
1413                 init_waitqueue_head(&cam->wait_frame);
1414                 init_waitqueue_head(&cam->wait_stream);
1415                 cam->nreadbuffers = 2;
1416                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1417                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1418                        sizeof(struct v4l2_rect));
1419                 cam->state |= DEV_INITIALIZED;
1420         }
1421
1422         DBG(2, "Initialization succeeded");
1423         return 0;
1424 }
1425
1426
1427 static void sn9c102_release_resources(struct sn9c102_device* cam)
1428 {
1429         mutex_lock(&sn9c102_sysfs_lock);
1430
1431         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1432         video_set_drvdata(cam->v4ldev, NULL);
1433         video_unregister_device(cam->v4ldev);
1434
1435         usb_put_dev(cam->usbdev);
1436
1437         mutex_unlock(&sn9c102_sysfs_lock);
1438
1439         kfree(cam->control_buffer);
1440 }
1441
1442 /*****************************************************************************/
1443
1444 static int sn9c102_open(struct inode* inode, struct file* filp)
1445 {
1446         struct sn9c102_device* cam;
1447         int err = 0;
1448
1449         /*
1450            This is the only safe way to prevent race conditions with
1451            disconnect
1452         */
1453         if (!down_read_trylock(&sn9c102_disconnect))
1454                 return -ERESTARTSYS;
1455
1456         cam = video_get_drvdata(video_devdata(filp));
1457
1458         if (mutex_lock_interruptible(&cam->dev_mutex)) {
1459                 up_read(&sn9c102_disconnect);
1460                 return -ERESTARTSYS;
1461         }
1462
1463         if (cam->users) {
1464                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1465                 if ((filp->f_flags & O_NONBLOCK) ||
1466                     (filp->f_flags & O_NDELAY)) {
1467                         err = -EWOULDBLOCK;
1468                         goto out;
1469                 }
1470                 mutex_unlock(&cam->dev_mutex);
1471                 err = wait_event_interruptible_exclusive(cam->open,
1472                                                   cam->state & DEV_DISCONNECTED
1473                                                          || !cam->users);
1474                 if (err) {
1475                         up_read(&sn9c102_disconnect);
1476                         return err;
1477                 }
1478                 if (cam->state & DEV_DISCONNECTED) {
1479                         up_read(&sn9c102_disconnect);
1480                         return -ENODEV;
1481                 }
1482                 mutex_lock(&cam->dev_mutex);
1483         }
1484
1485
1486         if (cam->state & DEV_MISCONFIGURED) {
1487                 err = sn9c102_init(cam);
1488                 if (err) {
1489                         DBG(1, "Initialization failed again. "
1490                                "I will retry on next open().");
1491                         goto out;
1492                 }
1493                 cam->state &= ~DEV_MISCONFIGURED;
1494         }
1495
1496         if ((err = sn9c102_start_transfer(cam)))
1497                 goto out;
1498
1499         filp->private_data = cam;
1500         cam->users++;
1501         cam->io = IO_NONE;
1502         cam->stream = STREAM_OFF;
1503         cam->nbuffers = 0;
1504         cam->frame_count = 0;
1505         sn9c102_empty_framequeues(cam);
1506
1507         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1508
1509 out:
1510         mutex_unlock(&cam->dev_mutex);
1511         up_read(&sn9c102_disconnect);
1512         return err;
1513 }
1514
1515
1516 static int sn9c102_release(struct inode* inode, struct file* filp)
1517 {
1518         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1519
1520         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
1521
1522         sn9c102_stop_transfer(cam);
1523
1524         sn9c102_release_buffers(cam);
1525
1526         if (cam->state & DEV_DISCONNECTED) {
1527                 sn9c102_release_resources(cam);
1528                 mutex_unlock(&cam->dev_mutex);
1529                 kfree(cam);
1530                 return 0;
1531         }
1532
1533         cam->users--;
1534         wake_up_interruptible_nr(&cam->open, 1);
1535
1536         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1537
1538         mutex_unlock(&cam->dev_mutex);
1539
1540         return 0;
1541 }
1542
1543
1544 static ssize_t
1545 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1546 {
1547         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1548         struct sn9c102_frame_t* f, * i;
1549         unsigned long lock_flags;
1550         long timeout;
1551         int err = 0;
1552
1553         if (mutex_lock_interruptible(&cam->fileop_mutex))
1554                 return -ERESTARTSYS;
1555
1556         if (cam->state & DEV_DISCONNECTED) {
1557                 DBG(1, "Device not present");
1558                 mutex_unlock(&cam->fileop_mutex);
1559                 return -ENODEV;
1560         }
1561
1562         if (cam->state & DEV_MISCONFIGURED) {
1563                 DBG(1, "The camera is misconfigured. Close and open it "
1564                        "again.");
1565                 mutex_unlock(&cam->fileop_mutex);
1566                 return -EIO;
1567         }
1568
1569         if (cam->io == IO_MMAP) {
1570                 DBG(3, "Close and open the device again to choose "
1571                        "the read method");
1572                 mutex_unlock(&cam->fileop_mutex);
1573                 return -EINVAL;
1574         }
1575
1576         if (cam->io == IO_NONE) {
1577                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1578                         DBG(1, "read() failed, not enough memory");
1579                         mutex_unlock(&cam->fileop_mutex);
1580                         return -ENOMEM;
1581                 }
1582                 cam->io = IO_READ;
1583                 cam->stream = STREAM_ON;
1584         }
1585
1586         if (list_empty(&cam->inqueue)) {
1587                 if (!list_empty(&cam->outqueue))
1588                         sn9c102_empty_framequeues(cam);
1589                 sn9c102_queue_unusedframes(cam);
1590         }
1591
1592         if (!count) {
1593                 mutex_unlock(&cam->fileop_mutex);
1594                 return 0;
1595         }
1596
1597         if (list_empty(&cam->outqueue)) {
1598                 if (filp->f_flags & O_NONBLOCK) {
1599                         mutex_unlock(&cam->fileop_mutex);
1600                         return -EAGAIN;
1601                 }
1602                 timeout = wait_event_interruptible_timeout
1603                           ( cam->wait_frame,
1604                             (!list_empty(&cam->outqueue)) ||
1605                             (cam->state & DEV_DISCONNECTED) ||
1606                             (cam->state & DEV_MISCONFIGURED),
1607                             cam->module_param.frame_timeout *
1608                             1000 * msecs_to_jiffies(1) );
1609                 if (timeout < 0) {
1610                         mutex_unlock(&cam->fileop_mutex);
1611                         return timeout;
1612                 }
1613                 if (cam->state & DEV_DISCONNECTED) {
1614                         mutex_unlock(&cam->fileop_mutex);
1615                         return -ENODEV;
1616                 }
1617                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1618                         mutex_unlock(&cam->fileop_mutex);
1619                         return -EIO;
1620                 }
1621         }
1622
1623         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1624
1625         if (count > f->buf.bytesused)
1626                 count = f->buf.bytesused;
1627
1628         if (copy_to_user(buf, f->bufmem, count)) {
1629                 err = -EFAULT;
1630                 goto exit;
1631         }
1632         *f_pos += count;
1633
1634 exit:
1635         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1636         list_for_each_entry(i, &cam->outqueue, frame)
1637                 i->state = F_UNUSED;
1638         INIT_LIST_HEAD(&cam->outqueue);
1639         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1640
1641         sn9c102_queue_unusedframes(cam);
1642
1643         PDBGG("Frame #%lu, bytes read: %zu",
1644               (unsigned long)f->buf.index, count);
1645
1646         mutex_unlock(&cam->fileop_mutex);
1647
1648         return count;
1649 }
1650
1651
1652 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
1653 {
1654         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1655         struct sn9c102_frame_t* f;
1656         unsigned long lock_flags;
1657         unsigned int mask = 0;
1658
1659         if (mutex_lock_interruptible(&cam->fileop_mutex))
1660                 return POLLERR;
1661
1662         if (cam->state & DEV_DISCONNECTED) {
1663                 DBG(1, "Device not present");
1664                 goto error;
1665         }
1666
1667         if (cam->state & DEV_MISCONFIGURED) {
1668                 DBG(1, "The camera is misconfigured. Close and open it "
1669                        "again.");
1670                 goto error;
1671         }
1672
1673         if (cam->io == IO_NONE) {
1674                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
1675                                              IO_READ)) {
1676                         DBG(1, "poll() failed, not enough memory");
1677                         goto error;
1678                 }
1679                 cam->io = IO_READ;
1680                 cam->stream = STREAM_ON;
1681         }
1682
1683         if (cam->io == IO_READ) {
1684                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1685                 list_for_each_entry(f, &cam->outqueue, frame)
1686                         f->state = F_UNUSED;
1687                 INIT_LIST_HEAD(&cam->outqueue);
1688                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1689                 sn9c102_queue_unusedframes(cam);
1690         }
1691
1692         poll_wait(filp, &cam->wait_frame, wait);
1693
1694         if (!list_empty(&cam->outqueue))
1695                 mask |= POLLIN | POLLRDNORM;
1696
1697         mutex_unlock(&cam->fileop_mutex);
1698
1699         return mask;
1700
1701 error:
1702         mutex_unlock(&cam->fileop_mutex);
1703         return POLLERR;
1704 }
1705
1706
1707 static void sn9c102_vm_open(struct vm_area_struct* vma)
1708 {
1709         struct sn9c102_frame_t* f = vma->vm_private_data;
1710         f->vma_use_count++;
1711 }
1712
1713
1714 static void sn9c102_vm_close(struct vm_area_struct* vma)
1715 {
1716         /* NOTE: buffers are not freed here */
1717         struct sn9c102_frame_t* f = vma->vm_private_data;
1718         f->vma_use_count--;
1719 }
1720
1721
1722 static struct vm_operations_struct sn9c102_vm_ops = {
1723         .open = sn9c102_vm_open,
1724         .close = sn9c102_vm_close,
1725 };
1726
1727
1728 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
1729 {
1730         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1731         unsigned long size = vma->vm_end - vma->vm_start,
1732                       start = vma->vm_start;
1733         void *pos;
1734         u32 i;
1735
1736         if (mutex_lock_interruptible(&cam->fileop_mutex))
1737                 return -ERESTARTSYS;
1738
1739         if (cam->state & DEV_DISCONNECTED) {
1740                 DBG(1, "Device not present");
1741                 mutex_unlock(&cam->fileop_mutex);
1742                 return -ENODEV;
1743         }
1744
1745         if (cam->state & DEV_MISCONFIGURED) {
1746                 DBG(1, "The camera is misconfigured. Close and open it "
1747                        "again.");
1748                 mutex_unlock(&cam->fileop_mutex);
1749                 return -EIO;
1750         }
1751
1752         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1753             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1754                 mutex_unlock(&cam->fileop_mutex);
1755                 return -EINVAL;
1756         }
1757
1758         for (i = 0; i < cam->nbuffers; i++) {
1759                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1760                         break;
1761         }
1762         if (i == cam->nbuffers) {
1763                 mutex_unlock(&cam->fileop_mutex);
1764                 return -EINVAL;
1765         }
1766
1767         vma->vm_flags |= VM_IO;
1768         vma->vm_flags |= VM_RESERVED;
1769
1770         pos = cam->frame[i].bufmem;
1771         while (size > 0) { /* size is page-aligned */
1772                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1773                         mutex_unlock(&cam->fileop_mutex);
1774                         return -EAGAIN;
1775                 }
1776                 start += PAGE_SIZE;
1777                 pos += PAGE_SIZE;
1778                 size -= PAGE_SIZE;
1779         }
1780
1781         vma->vm_ops = &sn9c102_vm_ops;
1782         vma->vm_private_data = &cam->frame[i];
1783
1784         sn9c102_vm_open(vma);
1785
1786         mutex_unlock(&cam->fileop_mutex);
1787
1788         return 0;
1789 }
1790
1791 /*****************************************************************************/
1792
1793 static int
1794 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
1795 {
1796         struct v4l2_capability cap = {
1797                 .driver = "sn9c102",
1798                 .version = SN9C102_MODULE_VERSION_CODE,
1799                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1800                                 V4L2_CAP_STREAMING,
1801         };
1802
1803         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1804         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1805                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1806                         sizeof(cap.bus_info));
1807
1808         if (copy_to_user(arg, &cap, sizeof(cap)))
1809                 return -EFAULT;
1810
1811         return 0;
1812 }
1813
1814
1815 static int
1816 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
1817 {
1818         struct v4l2_input i;
1819
1820         if (copy_from_user(&i, arg, sizeof(i)))
1821                 return -EFAULT;
1822
1823         if (i.index)
1824                 return -EINVAL;
1825
1826         memset(&i, 0, sizeof(i));
1827         strcpy(i.name, "Camera");
1828         i.type = V4L2_INPUT_TYPE_CAMERA;
1829
1830         if (copy_to_user(arg, &i, sizeof(i)))
1831                 return -EFAULT;
1832
1833         return 0;
1834 }
1835
1836
1837 static int
1838 sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
1839 {
1840         int index = 0;
1841
1842         if (copy_to_user(arg, &index, sizeof(index)))
1843                 return -EFAULT;
1844
1845         return 0;
1846 }
1847
1848
1849 static int
1850 sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
1851 {
1852         int index;
1853
1854         if (copy_from_user(&index, arg, sizeof(index)))
1855                 return -EFAULT;
1856
1857         if (index != 0)
1858                 return -EINVAL;
1859
1860         return 0;
1861 }
1862
1863
1864 static int
1865 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
1866 {
1867         struct sn9c102_sensor* s = &cam->sensor;
1868         struct v4l2_queryctrl qc;
1869         u8 i;
1870
1871         if (copy_from_user(&qc, arg, sizeof(qc)))
1872                 return -EFAULT;
1873
1874         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1875                 if (qc.id && qc.id == s->qctrl[i].id) {
1876                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1877                         if (copy_to_user(arg, &qc, sizeof(qc)))
1878                                 return -EFAULT;
1879                         return 0;
1880                 }
1881
1882         return -EINVAL;
1883 }
1884
1885
1886 static int
1887 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
1888 {
1889         struct sn9c102_sensor* s = &cam->sensor;
1890         struct v4l2_control ctrl;
1891         int err = 0;
1892         u8 i;
1893
1894         if (!s->get_ctrl && !s->set_ctrl)
1895                 return -EINVAL;
1896
1897         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1898                 return -EFAULT;
1899
1900         if (!s->get_ctrl) {
1901                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1902                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
1903                                 ctrl.value = s->_qctrl[i].default_value;
1904                                 goto exit;
1905                         }
1906                 return -EINVAL;
1907         } else
1908                 err = s->get_ctrl(cam, &ctrl);
1909
1910 exit:
1911         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1912                 return -EFAULT;
1913
1914         return err;
1915 }
1916
1917
1918 static int
1919 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
1920 {
1921         struct sn9c102_sensor* s = &cam->sensor;
1922         struct v4l2_control ctrl;
1923         u8 i;
1924         int err = 0;
1925
1926         if (!s->set_ctrl)
1927                 return -EINVAL;
1928
1929         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1930                 return -EFAULT;
1931
1932         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1933                 if (ctrl.id == s->qctrl[i].id) {
1934                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1935                                 return -EINVAL;
1936                         if (ctrl.value < s->qctrl[i].minimum ||
1937                             ctrl.value > s->qctrl[i].maximum)
1938                                 return -ERANGE;
1939                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1940                         break;
1941                 }
1942
1943         if ((err = s->set_ctrl(cam, &ctrl)))
1944                 return err;
1945
1946         s->_qctrl[i].default_value = ctrl.value;
1947
1948         PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
1949               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
1950
1951         return 0;
1952 }
1953
1954
1955 static int
1956 sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
1957 {
1958         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1959
1960         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1961         cc->pixelaspect.numerator = 1;
1962         cc->pixelaspect.denominator = 1;
1963
1964         if (copy_to_user(arg, cc, sizeof(*cc)))
1965                 return -EFAULT;
1966
1967         return 0;
1968 }
1969
1970
1971 static int
1972 sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
1973 {
1974         struct sn9c102_sensor* s = &cam->sensor;
1975         struct v4l2_crop crop = {
1976                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1977         };
1978
1979         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1980
1981         if (copy_to_user(arg, &crop, sizeof(crop)))
1982                 return -EFAULT;
1983
1984         return 0;
1985 }
1986
1987
1988 static int
1989 sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
1990 {
1991         struct sn9c102_sensor* s = &cam->sensor;
1992         struct v4l2_crop crop;
1993         struct v4l2_rect* rect;
1994         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1995         struct v4l2_pix_format* pix_format = &(s->pix_format);
1996         u8 scale;
1997         const enum sn9c102_stream_state stream = cam->stream;
1998         const u32 nbuffers = cam->nbuffers;
1999         u32 i;
2000         int err = 0;
2001
2002         if (copy_from_user(&crop, arg, sizeof(crop)))
2003                 return -EFAULT;
2004
2005         rect = &(crop.c);
2006
2007         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2008                 return -EINVAL;
2009
2010         if (cam->module_param.force_munmap)
2011                 for (i = 0; i < cam->nbuffers; i++)
2012                         if (cam->frame[i].vma_use_count) {
2013                                 DBG(3, "VIDIOC_S_CROP failed. "
2014                                        "Unmap the buffers first.");
2015                                 return -EINVAL;
2016                         }
2017
2018         /* Preserve R,G or B origin */
2019         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
2020         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
2021
2022         if (rect->width < 16)
2023                 rect->width = 16;
2024         if (rect->height < 16)
2025                 rect->height = 16;
2026         if (rect->width > bounds->width)
2027                 rect->width = bounds->width;
2028         if (rect->height > bounds->height)
2029                 rect->height = bounds->height;
2030         if (rect->left < bounds->left)
2031                 rect->left = bounds->left;
2032         if (rect->top < bounds->top)
2033                 rect->top = bounds->top;
2034         if (rect->left + rect->width > bounds->left + bounds->width)
2035                 rect->left = bounds->left+bounds->width - rect->width;
2036         if (rect->top + rect->height > bounds->top + bounds->height)
2037                 rect->top = bounds->top+bounds->height - rect->height;
2038
2039         rect->width &= ~15L;
2040         rect->height &= ~15L;
2041
2042         if (SN9C102_PRESERVE_IMGSCALE) {
2043                 /* Calculate the actual scaling factor */
2044                 u32 a, b;
2045                 a = rect->width * rect->height;
2046                 b = pix_format->width * pix_format->height;
2047                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2048         } else
2049                 scale = 1;
2050
2051         if (cam->stream == STREAM_ON)
2052                 if ((err = sn9c102_stream_interrupt(cam)))
2053                         return err;
2054
2055         if (copy_to_user(arg, &crop, sizeof(crop))) {
2056                 cam->stream = stream;
2057                 return -EFAULT;
2058         }
2059
2060         if (cam->module_param.force_munmap || cam->io == IO_READ)
2061                 sn9c102_release_buffers(cam);
2062
2063         err = sn9c102_set_crop(cam, rect);
2064         if (s->set_crop)
2065                 err += s->set_crop(cam, rect);
2066         err += sn9c102_set_scale(cam, scale);
2067
2068         if (err) { /* atomic, no rollback in ioctl() */
2069                 cam->state |= DEV_MISCONFIGURED;
2070                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
2071                        "use the camera, close and open /dev/video%d again.",
2072                     cam->v4ldev->minor);
2073                 return -EIO;
2074         }
2075
2076         s->pix_format.width = rect->width/scale;
2077         s->pix_format.height = rect->height/scale;
2078         memcpy(&(s->_rect), rect, sizeof(*rect));
2079
2080         if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
2081             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2082                 cam->state |= DEV_MISCONFIGURED;
2083                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
2084                        "use the camera, close and open /dev/video%d again.",
2085                     cam->v4ldev->minor);
2086                 return -ENOMEM;
2087         }
2088
2089         if (cam->io == IO_READ)
2090                 sn9c102_empty_framequeues(cam);
2091         else if (cam->module_param.force_munmap)
2092                 sn9c102_requeue_outqueue(cam);
2093
2094         cam->stream = stream;
2095
2096         return 0;
2097 }
2098
2099
2100 static int
2101 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2102 {
2103         struct v4l2_fmtdesc fmtd;
2104
2105         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2106                 return -EFAULT;
2107
2108         if (fmtd.index == 0) {
2109                 strcpy(fmtd.description, "bayer rgb");
2110                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2111         } else if (fmtd.index == 1) {
2112                 strcpy(fmtd.description, "compressed");
2113                 fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2114                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2115         } else
2116                 return -EINVAL;
2117
2118         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2119         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2120
2121         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2122                 return -EFAULT;
2123
2124         return 0;
2125 }
2126
2127
2128 static int
2129 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2130 {
2131         struct v4l2_format format;
2132         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
2133
2134         if (copy_from_user(&format, arg, sizeof(format)))
2135                 return -EFAULT;
2136
2137         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2138                 return -EINVAL;
2139
2140         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_SN9C10X)
2141                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2142         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2143         pfmt->field = V4L2_FIELD_NONE;
2144         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2145
2146         if (copy_to_user(arg, &format, sizeof(format)))
2147                 return -EFAULT;
2148
2149         return 0;
2150 }
2151
2152
2153 static int
2154 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2155                          void __user * arg)
2156 {
2157         struct sn9c102_sensor* s = &cam->sensor;
2158         struct v4l2_format format;
2159         struct v4l2_pix_format* pix;
2160         struct v4l2_pix_format* pfmt = &(s->pix_format);
2161         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2162         struct v4l2_rect rect;
2163         u8 scale;
2164         const enum sn9c102_stream_state stream = cam->stream;
2165         const u32 nbuffers = cam->nbuffers;
2166         u32 i;
2167         int err = 0;
2168
2169         if (copy_from_user(&format, arg, sizeof(format)))
2170                 return -EFAULT;
2171
2172         pix = &(format.fmt.pix);
2173
2174         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2175                 return -EINVAL;
2176
2177         memcpy(&rect, &(s->_rect), sizeof(rect));
2178
2179         { /* calculate the actual scaling factor */
2180                 u32 a, b;
2181                 a = rect.width * rect.height;
2182                 b = pix->width * pix->height;
2183                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2184         }
2185
2186         rect.width = scale * pix->width;
2187         rect.height = scale * pix->height;
2188
2189         if (rect.width < 16)
2190                 rect.width = 16;
2191         if (rect.height < 16)
2192                 rect.height = 16;
2193         if (rect.width > bounds->left + bounds->width - rect.left)
2194                 rect.width = bounds->left + bounds->width - rect.left;
2195         if (rect.height > bounds->top + bounds->height - rect.top)
2196                 rect.height = bounds->top + bounds->height - rect.top;
2197
2198         rect.width &= ~15L;
2199         rect.height &= ~15L;
2200
2201         { /* adjust the scaling factor */
2202                 u32 a, b;
2203                 a = rect.width * rect.height;
2204                 b = pix->width * pix->height;
2205                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2206         }
2207
2208         pix->width = rect.width / scale;
2209         pix->height = rect.height / scale;
2210
2211         if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2212             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2213                 pix->pixelformat = pfmt->pixelformat;
2214         pix->priv = pfmt->priv; /* bpp */
2215         pix->colorspace = pfmt->colorspace;
2216         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
2217                             ? 0 : (pix->width * pix->priv) / 8;
2218         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2219         pix->field = V4L2_FIELD_NONE;
2220
2221         if (cmd == VIDIOC_TRY_FMT) {
2222                 if (copy_to_user(arg, &format, sizeof(format)))
2223                         return -EFAULT;
2224                 return 0;
2225         }
2226
2227         if (cam->module_param.force_munmap)
2228                 for (i = 0; i < cam->nbuffers; i++)
2229                         if (cam->frame[i].vma_use_count) {
2230                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2231                                        "buffers first.");
2232                                 return -EINVAL;
2233                         }
2234
2235         if (cam->stream == STREAM_ON)
2236                 if ((err = sn9c102_stream_interrupt(cam)))
2237                         return err;
2238
2239         if (copy_to_user(arg, &format, sizeof(format))) {
2240                 cam->stream = stream;
2241                 return -EFAULT;
2242         }
2243
2244         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2245                 sn9c102_release_buffers(cam);
2246
2247         err += sn9c102_set_pix_format(cam, pix);
2248         err += sn9c102_set_crop(cam, &rect);
2249         if (s->set_pix_format)
2250                 err += s->set_pix_format(cam, pix);
2251         if (s->set_crop)
2252                 err += s->set_crop(cam, &rect);
2253         err += sn9c102_set_scale(cam, scale);
2254
2255         if (err) { /* atomic, no rollback in ioctl() */
2256                 cam->state |= DEV_MISCONFIGURED;
2257                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2258                        "use the camera, close and open /dev/video%d again.",
2259                     cam->v4ldev->minor);
2260                 return -EIO;
2261         }
2262
2263         memcpy(pfmt, pix, sizeof(*pix));
2264         memcpy(&(s->_rect), &rect, sizeof(rect));
2265
2266         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2267             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2268                 cam->state |= DEV_MISCONFIGURED;
2269                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2270                        "use the camera, close and open /dev/video%d again.",
2271                     cam->v4ldev->minor);
2272                 return -ENOMEM;
2273         }
2274
2275         if (cam->io == IO_READ)
2276                 sn9c102_empty_framequeues(cam);
2277         else if (cam->module_param.force_munmap)
2278                 sn9c102_requeue_outqueue(cam);
2279
2280         cam->stream = stream;
2281
2282         return 0;
2283 }
2284
2285
2286 static int
2287 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2288 {
2289         if (copy_to_user(arg, &cam->compression,
2290                          sizeof(cam->compression)))
2291                 return -EFAULT;
2292
2293         return 0;
2294 }
2295
2296
2297 static int
2298 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2299 {
2300         struct v4l2_jpegcompression jc;
2301         const enum sn9c102_stream_state stream = cam->stream;
2302         int err = 0;
2303
2304         if (copy_from_user(&jc, arg, sizeof(jc)))
2305                 return -EFAULT;
2306
2307         if (jc.quality != 0 && jc.quality != 1)
2308                 return -EINVAL;
2309
2310         if (cam->stream == STREAM_ON)
2311                 if ((err = sn9c102_stream_interrupt(cam)))
2312                         return err;
2313
2314         err += sn9c102_set_compression(cam, &jc);
2315         if (err) { /* atomic, no rollback in ioctl() */
2316                 cam->state |= DEV_MISCONFIGURED;
2317                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2318                        "problems. To use the camera, close and open "
2319                        "/dev/video%d again.", cam->v4ldev->minor);
2320                 return -EIO;
2321         }
2322
2323         cam->compression.quality = jc.quality;
2324
2325         cam->stream = stream;
2326
2327         return 0;
2328 }
2329
2330
2331 static int
2332 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2333 {
2334         struct v4l2_requestbuffers rb;
2335         u32 i;
2336         int err;
2337
2338         if (copy_from_user(&rb, arg, sizeof(rb)))
2339                 return -EFAULT;
2340
2341         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2342             rb.memory != V4L2_MEMORY_MMAP)
2343                 return -EINVAL;
2344
2345         if (cam->io == IO_READ) {
2346                 DBG(3, "Close and open the device again to choose the mmap "
2347                        "I/O method");
2348                 return -EINVAL;
2349         }
2350
2351         for (i = 0; i < cam->nbuffers; i++)
2352                 if (cam->frame[i].vma_use_count) {
2353                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2354                                "still mapped.");
2355                         return -EINVAL;
2356                 }
2357
2358         if (cam->stream == STREAM_ON)
2359                 if ((err = sn9c102_stream_interrupt(cam)))
2360                         return err;
2361
2362         sn9c102_empty_framequeues(cam);
2363
2364         sn9c102_release_buffers(cam);
2365         if (rb.count)
2366                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2367
2368         if (copy_to_user(arg, &rb, sizeof(rb))) {
2369                 sn9c102_release_buffers(cam);
2370                 cam->io = IO_NONE;
2371                 return -EFAULT;
2372         }
2373
2374         cam->io = rb.count ? IO_MMAP : IO_NONE;
2375
2376         return 0;
2377 }
2378
2379
2380 static int
2381 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2382 {
2383         struct v4l2_buffer b;
2384
2385         if (copy_from_user(&b, arg, sizeof(b)))
2386                 return -EFAULT;
2387
2388         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2389             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2390                 return -EINVAL;
2391
2392         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2393
2394         if (cam->frame[b.index].vma_use_count)
2395                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2396
2397         if (cam->frame[b.index].state == F_DONE)
2398                 b.flags |= V4L2_BUF_FLAG_DONE;
2399         else if (cam->frame[b.index].state != F_UNUSED)
2400                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2401
2402         if (copy_to_user(arg, &b, sizeof(b)))
2403                 return -EFAULT;
2404
2405         return 0;
2406 }
2407
2408
2409 static int
2410 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2411 {
2412         struct v4l2_buffer b;
2413         unsigned long lock_flags;
2414
2415         if (copy_from_user(&b, arg, sizeof(b)))
2416                 return -EFAULT;
2417
2418         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2419             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2420                 return -EINVAL;
2421
2422         if (cam->frame[b.index].state != F_UNUSED)
2423                 return -EINVAL;
2424
2425         cam->frame[b.index].state = F_QUEUED;
2426
2427         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2428         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2429         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2430
2431         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2432
2433         return 0;
2434 }
2435
2436
2437 static int
2438 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2439                      void __user * arg)
2440 {
2441         struct v4l2_buffer b;
2442         struct sn9c102_frame_t *f;
2443         unsigned long lock_flags;
2444         long timeout;
2445
2446         if (copy_from_user(&b, arg, sizeof(b)))
2447                 return -EFAULT;
2448
2449         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2450                 return -EINVAL;
2451
2452         if (list_empty(&cam->outqueue)) {
2453                 if (cam->stream == STREAM_OFF)
2454                         return -EINVAL;
2455                 if (filp->f_flags & O_NONBLOCK)
2456                         return -EAGAIN;
2457                 timeout = wait_event_interruptible_timeout
2458                           ( cam->wait_frame,
2459                             (!list_empty(&cam->outqueue)) ||
2460                             (cam->state & DEV_DISCONNECTED) ||
2461                             (cam->state & DEV_MISCONFIGURED),
2462                             cam->module_param.frame_timeout *
2463                             1000 * msecs_to_jiffies(1) );
2464                 if (timeout < 0)
2465                         return timeout;
2466                 if (cam->state & DEV_DISCONNECTED)
2467                         return -ENODEV;
2468                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2469                         return -EIO;
2470         }
2471
2472         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2473         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2474         list_del(cam->outqueue.next);
2475         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2476
2477         f->state = F_UNUSED;
2478
2479         memcpy(&b, &f->buf, sizeof(b));
2480         if (f->vma_use_count)
2481                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2482
2483         if (copy_to_user(arg, &b, sizeof(b)))
2484                 return -EFAULT;
2485
2486         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2487
2488         return 0;
2489 }
2490
2491
2492 static int
2493 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2494 {
2495         int type;
2496
2497         if (copy_from_user(&type, arg, sizeof(type)))
2498                 return -EFAULT;
2499
2500         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2501                 return -EINVAL;
2502
2503         if (list_empty(&cam->inqueue))
2504                 return -EINVAL;
2505
2506         cam->stream = STREAM_ON;
2507
2508         DBG(3, "Stream on");
2509
2510         return 0;
2511 }
2512
2513
2514 static int
2515 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2516 {
2517         int type, err;
2518
2519         if (copy_from_user(&type, arg, sizeof(type)))
2520                 return -EFAULT;
2521
2522         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2523                 return -EINVAL;
2524
2525         if (cam->stream == STREAM_ON)
2526                 if ((err = sn9c102_stream_interrupt(cam)))
2527                         return err;
2528
2529         sn9c102_empty_framequeues(cam);
2530
2531         DBG(3, "Stream off");
2532
2533         return 0;
2534 }
2535
2536
2537 static int
2538 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2539 {
2540         struct v4l2_streamparm sp;
2541
2542         if (copy_from_user(&sp, arg, sizeof(sp)))
2543                 return -EFAULT;
2544
2545         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2546                 return -EINVAL;
2547
2548         sp.parm.capture.extendedmode = 0;
2549         sp.parm.capture.readbuffers = cam->nreadbuffers;
2550
2551         if (copy_to_user(arg, &sp, sizeof(sp)))
2552                 return -EFAULT;
2553
2554         return 0;
2555 }
2556
2557
2558 static int
2559 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
2560 {
2561         struct v4l2_streamparm sp;
2562
2563         if (copy_from_user(&sp, arg, sizeof(sp)))
2564                 return -EFAULT;
2565
2566         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2567                 return -EINVAL;
2568
2569         sp.parm.capture.extendedmode = 0;
2570
2571         if (sp.parm.capture.readbuffers == 0)
2572                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2573
2574         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
2575                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
2576
2577         if (copy_to_user(arg, &sp, sizeof(sp)))
2578                 return -EFAULT;
2579
2580         cam->nreadbuffers = sp.parm.capture.readbuffers;
2581
2582         return 0;
2583 }
2584
2585
2586 static int sn9c102_ioctl_v4l2(struct inode* inode, struct file* filp,
2587                               unsigned int cmd, void __user * arg)
2588 {
2589         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2590
2591         switch (cmd) {
2592
2593         case VIDIOC_QUERYCAP:
2594                 return sn9c102_vidioc_querycap(cam, arg);
2595
2596         case VIDIOC_ENUMINPUT:
2597                 return sn9c102_vidioc_enuminput(cam, arg);
2598
2599         case VIDIOC_G_INPUT:
2600                 return sn9c102_vidioc_g_input(cam, arg);
2601
2602         case VIDIOC_S_INPUT:
2603                 return sn9c102_vidioc_s_input(cam, arg);
2604
2605         case VIDIOC_QUERYCTRL:
2606                 return sn9c102_vidioc_query_ctrl(cam, arg);
2607
2608         case VIDIOC_G_CTRL:
2609                 return sn9c102_vidioc_g_ctrl(cam, arg);
2610
2611         case VIDIOC_S_CTRL:
2612                 return sn9c102_vidioc_s_ctrl(cam, arg);
2613
2614         case VIDIOC_CROPCAP:
2615                 return sn9c102_vidioc_cropcap(cam, arg);
2616
2617         case VIDIOC_G_CROP:
2618                 return sn9c102_vidioc_g_crop(cam, arg);
2619
2620         case VIDIOC_S_CROP:
2621                 return sn9c102_vidioc_s_crop(cam, arg);
2622
2623         case VIDIOC_ENUM_FMT:
2624                 return sn9c102_vidioc_enum_fmt(cam, arg);
2625
2626         case VIDIOC_G_FMT:
2627                 return sn9c102_vidioc_g_fmt(cam, arg);
2628
2629         case VIDIOC_TRY_FMT:
2630         case VIDIOC_S_FMT:
2631                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
2632
2633         case VIDIOC_G_JPEGCOMP:
2634                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
2635
2636         case VIDIOC_S_JPEGCOMP:
2637                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
2638
2639         case VIDIOC_REQBUFS:
2640                 return sn9c102_vidioc_reqbufs(cam, arg);
2641
2642         case VIDIOC_QUERYBUF:
2643                 return sn9c102_vidioc_querybuf(cam, arg);
2644
2645         case VIDIOC_QBUF:
2646                 return sn9c102_vidioc_qbuf(cam, arg);
2647
2648         case VIDIOC_DQBUF:
2649                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
2650
2651         case VIDIOC_STREAMON:
2652                 return sn9c102_vidioc_streamon(cam, arg);
2653
2654         case VIDIOC_STREAMOFF:
2655                 return sn9c102_vidioc_streamoff(cam, arg);
2656
2657         case VIDIOC_G_PARM:
2658                 return sn9c102_vidioc_g_parm(cam, arg);
2659
2660         case VIDIOC_S_PARM:
2661                 return sn9c102_vidioc_s_parm(cam, arg);
2662
2663         case VIDIOC_G_STD:
2664         case VIDIOC_S_STD:
2665         case VIDIOC_QUERYSTD:
2666         case VIDIOC_ENUMSTD:
2667         case VIDIOC_QUERYMENU:
2668                 return -EINVAL;
2669
2670         default:
2671                 return -EINVAL;
2672
2673         }
2674 }
2675
2676
2677 static int sn9c102_ioctl(struct inode* inode, struct file* filp,
2678                          unsigned int cmd, unsigned long arg)
2679 {
2680         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2681         int err = 0;
2682
2683         if (mutex_lock_interruptible(&cam->fileop_mutex))
2684                 return -ERESTARTSYS;
2685
2686         if (cam->state & DEV_DISCONNECTED) {
2687                 DBG(1, "Device not present");
2688                 mutex_unlock(&cam->fileop_mutex);
2689                 return -ENODEV;
2690         }
2691
2692         if (cam->state & DEV_MISCONFIGURED) {
2693                 DBG(1, "The camera is misconfigured. Close and open it "
2694                        "again.");
2695                 mutex_unlock(&cam->fileop_mutex);
2696                 return -EIO;
2697         }
2698
2699         V4LDBG(3, "sn9c102", cmd);
2700
2701         err = sn9c102_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2702
2703         mutex_unlock(&cam->fileop_mutex);
2704
2705         return err;
2706 }
2707
2708 /*****************************************************************************/
2709
2710 static struct file_operations sn9c102_fops = {
2711         .owner = THIS_MODULE,
2712         .open =    sn9c102_open,
2713         .release = sn9c102_release,
2714         .ioctl =   sn9c102_ioctl,
2715         .read =    sn9c102_read,
2716         .poll =    sn9c102_poll,
2717         .mmap =    sn9c102_mmap,
2718         .llseek =  no_llseek,
2719 };
2720
2721 /*****************************************************************************/
2722
2723 /* It exists a single interface only. We do not need to validate anything. */
2724 static int
2725 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2726 {
2727         struct usb_device *udev = interface_to_usbdev(intf);
2728         struct sn9c102_device* cam;
2729         static unsigned int dev_nr = 0;
2730         unsigned int i;
2731         int err = 0, r;
2732
2733         if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
2734                 return -ENOMEM;
2735
2736         cam->usbdev = udev;
2737
2738         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2739                 DBG(1, "kmalloc() failed");
2740                 err = -ENOMEM;
2741                 goto fail;
2742         }
2743
2744         if (!(cam->v4ldev = video_device_alloc())) {
2745                 DBG(1, "video_device_alloc() failed");
2746                 err = -ENOMEM;
2747                 goto fail;
2748         }
2749
2750         mutex_init(&cam->dev_mutex);
2751
2752         r = sn9c102_read_reg(cam, 0x00);
2753         if (r < 0 || r != 0x10) {
2754                 DBG(1, "Sorry, this is not a SN9C10x based camera "
2755                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2756                 err = -ENODEV;
2757                 goto fail;
2758         }
2759
2760         cam->bridge = (id->idProduct & 0xffc0) == 0x6080 ?
2761                       BRIDGE_SN9C103 : BRIDGE_SN9C102;
2762         switch (cam->bridge) {
2763         case BRIDGE_SN9C101:
2764         case BRIDGE_SN9C102:
2765                 DBG(2, "SN9C10[12] PC Camera Controller detected "
2766                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2767                 break;
2768         case BRIDGE_SN9C103:
2769                 DBG(2, "SN9C103 PC Camera Controller detected "
2770                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2771                 break;
2772         }
2773
2774         for  (i = 0; sn9c102_sensor_table[i]; i++) {
2775                 err = sn9c102_sensor_table[i](cam);
2776                 if (!err)
2777                         break;
2778         }
2779
2780         if (!err) {
2781                 DBG(2, "%s image sensor detected", cam->sensor.name);
2782                 DBG(3, "Support for %s maintained by %s",
2783                     cam->sensor.name, cam->sensor.maintainer);
2784         } else {
2785                 DBG(1, "No supported image sensor detected");
2786                 err = -ENODEV;
2787                 goto fail;
2788         }
2789
2790         if (sn9c102_init(cam)) {
2791                 DBG(1, "Initialization failed. I will retry on open().");
2792                 cam->state |= DEV_MISCONFIGURED;
2793         }
2794
2795         strcpy(cam->v4ldev->name, "SN9C10x PC Camera");
2796         cam->v4ldev->owner = THIS_MODULE;
2797         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2798         cam->v4ldev->hardware = 0;
2799         cam->v4ldev->fops = &sn9c102_fops;
2800         cam->v4ldev->minor = video_nr[dev_nr];
2801         cam->v4ldev->release = video_device_release;
2802         video_set_drvdata(cam->v4ldev, cam);
2803
2804         mutex_lock(&cam->dev_mutex);
2805
2806         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2807                                     video_nr[dev_nr]);
2808         if (err) {
2809                 DBG(1, "V4L2 device registration failed");
2810                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2811                         DBG(1, "Free /dev/videoX node not found");
2812                 video_nr[dev_nr] = -1;
2813                 dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2814                 mutex_unlock(&cam->dev_mutex);
2815                 goto fail;
2816         }
2817
2818         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2819
2820         cam->module_param.force_munmap = force_munmap[dev_nr];
2821         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2822
2823         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2824
2825 #ifdef CONFIG_VIDEO_ADV_DEBUG
2826         sn9c102_create_sysfs(cam);
2827         DBG(2, "Optional device control through 'sysfs' interface ready");
2828 #endif
2829
2830         usb_set_intfdata(intf, cam);
2831
2832         mutex_unlock(&cam->dev_mutex);
2833
2834         return 0;
2835
2836 fail:
2837         if (cam) {
2838                 kfree(cam->control_buffer);
2839                 if (cam->v4ldev)
2840                         video_device_release(cam->v4ldev);
2841                 kfree(cam);
2842         }
2843         return err;
2844 }
2845
2846
2847 static void sn9c102_usb_disconnect(struct usb_interface* intf)
2848 {
2849         struct sn9c102_device* cam = usb_get_intfdata(intf);
2850
2851         if (!cam)
2852                 return;
2853
2854         down_write(&sn9c102_disconnect);
2855
2856         mutex_lock(&cam->dev_mutex);
2857
2858         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2859
2860         wake_up_interruptible_all(&cam->open);
2861
2862         if (cam->users) {
2863                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2864                        "memory deallocation are deferred on close.",
2865                     cam->v4ldev->minor);
2866                 cam->state |= DEV_MISCONFIGURED;
2867                 sn9c102_stop_transfer(cam);
2868                 cam->state |= DEV_DISCONNECTED;
2869                 wake_up_interruptible(&cam->wait_frame);
2870                 wake_up(&cam->wait_stream);
2871                 usb_get_dev(cam->usbdev);
2872         } else {
2873                 cam->state |= DEV_DISCONNECTED;
2874                 sn9c102_release_resources(cam);
2875         }
2876
2877         mutex_unlock(&cam->dev_mutex);
2878
2879         if (!cam->users)
2880                 kfree(cam);
2881
2882         up_write(&sn9c102_disconnect);
2883 }
2884
2885
2886 static struct usb_driver sn9c102_usb_driver = {
2887         .name =       "sn9c102",
2888         .id_table =   sn9c102_id_table,
2889         .probe =      sn9c102_usb_probe,
2890         .disconnect = sn9c102_usb_disconnect,
2891 };
2892
2893 /*****************************************************************************/
2894
2895 static int __init sn9c102_module_init(void)
2896 {
2897         int err = 0;
2898
2899         KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
2900         KDBG(3, SN9C102_MODULE_AUTHOR);
2901
2902         if ((err = usb_register(&sn9c102_usb_driver)))
2903                 KDBG(1, "usb_register() failed");
2904
2905         return err;
2906 }
2907
2908
2909 static void __exit sn9c102_module_exit(void)
2910 {
2911         usb_deregister(&sn9c102_usb_driver);
2912 }
2913
2914
2915 module_init(sn9c102_module_init);
2916 module_exit(sn9c102_module_exit);