V4L/DVB (8788): v4l: replace video_get_drvdata(video_devdata(filp)) with video_drvdat...
[linux-2.6.git] / drivers / media / video / zc0301 / zc0301_core.c
1 /***************************************************************************
2  * Video4Linux2 driver for ZC0301[P] Image Processor and Control Chip      *
3  *                                                                         *
4  * Copyright (C) 2006-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
5  *                                                                         *
6  * Informations about the chip internals needed to enable the I2C protocol *
7  * have been taken from the documentation of the ZC030x Video4Linux1       *
8  * driver written by Andrew Birkett <andy@nobugs.org>                      *
9  *                                                                         *
10  * This program is free software; you can redistribute it and/or modify    *
11  * it under the terms of the GNU General Public License as published by    *
12  * the Free Software Foundation; either version 2 of the License, or       *
13  * (at your option) any later version.                                     *
14  *                                                                         *
15  * This program is distributed in the hope that it will be useful,         *
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
18  * GNU General Public License for more details.                            *
19  *                                                                         *
20  * You should have received a copy of the GNU General Public License       *
21  * along with this program; if not, write to the Free Software             *
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
23  ***************************************************************************/
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/param.h>
29 #include <linux/errno.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/fs.h>
33 #include <linux/delay.h>
34 #include <linux/compiler.h>
35 #include <linux/ioctl.h>
36 #include <linux/poll.h>
37 #include <linux/stat.h>
38 #include <linux/mm.h>
39 #include <linux/vmalloc.h>
40 #include <linux/page-flags.h>
41 #include <asm/byteorder.h>
42 #include <asm/page.h>
43 #include <asm/uaccess.h>
44
45 #include "zc0301.h"
46
47 /*****************************************************************************/
48
49 #define ZC0301_MODULE_NAME    "V4L2 driver for ZC0301[P] "                    \
50                               "Image Processor and Control Chip"
51 #define ZC0301_MODULE_AUTHOR  "(C) 2006-2007 Luca Risolia"
52 #define ZC0301_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
53 #define ZC0301_MODULE_LICENSE "GPL"
54 #define ZC0301_MODULE_VERSION "1:1.10"
55 #define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 10)
56
57 /*****************************************************************************/
58
59 MODULE_DEVICE_TABLE(usb, zc0301_id_table);
60
61 MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
62 MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
63 MODULE_VERSION(ZC0301_MODULE_VERSION);
64 MODULE_LICENSE(ZC0301_MODULE_LICENSE);
65
66 static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
67 module_param_array(video_nr, short, NULL, 0444);
68 MODULE_PARM_DESC(video_nr,
69                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
70                  "\n -1 = use next available (default)"
71                  "\n  n = use minor number n (integer >= 0)"
72                  "\nYou can specify up to "
73                  __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
74                  "\nFor example:"
75                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
76                  "\nthe second registered camera and use auto for the first"
77                  "\none and for every other camera."
78                  "\n");
79
80 static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
81                                ZC0301_FORCE_MUNMAP};
82 module_param_array(force_munmap, bool, NULL, 0444);
83 MODULE_PARM_DESC(force_munmap,
84                  "\n<0|1[,...]> Force the application to unmap previously"
85                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
86                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
87                  "\nthis feature. This parameter is specific for each"
88                  "\ndetected camera."
89                  "\n 0 = do not force memory unmapping"
90                  "\n 1 = force memory unmapping (save memory)"
91                  "\nDefault value is "__MODULE_STRING(ZC0301_FORCE_MUNMAP)"."
92                  "\n");
93
94 static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] =
95                                        ZC0301_FRAME_TIMEOUT};
96 module_param_array(frame_timeout, uint, NULL, 0644);
97 MODULE_PARM_DESC(frame_timeout,
98                  "\n<n[,...]> Timeout for a video frame in seconds."
99                  "\nThis parameter is specific for each detected camera."
100                  "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"."
101                  "\n");
102
103 #ifdef ZC0301_DEBUG
104 static unsigned short debug = ZC0301_DEBUG_LEVEL;
105 module_param(debug, ushort, 0644);
106 MODULE_PARM_DESC(debug,
107                  "\n<n> Debugging information level, from 0 to 3:"
108                  "\n0 = none (use carefully)"
109                  "\n1 = critical errors"
110                  "\n2 = significant informations"
111                  "\n3 = more verbose messages"
112                  "\nLevel 3 is useful for testing only, when only "
113                  "one device is used."
114                  "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
115                  "\n");
116 #endif
117
118 /*****************************************************************************/
119
120 static u32
121 zc0301_request_buffers(struct zc0301_device* cam, u32 count,
122                        enum zc0301_io_method io)
123 {
124         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
125         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
126         const size_t imagesize = cam->module_param.force_munmap ||
127                                  io == IO_READ ?
128                                  (p->width * p->height * p->priv) / 8 :
129                                  (r->width * r->height * p->priv) / 8;
130         void* buff = NULL;
131         u32 i;
132
133         if (count > ZC0301_MAX_FRAMES)
134                 count = ZC0301_MAX_FRAMES;
135
136         cam->nbuffers = count;
137         while (cam->nbuffers > 0) {
138                 if ((buff = vmalloc_32_user(cam->nbuffers *
139                                             PAGE_ALIGN(imagesize))))
140                         break;
141                 cam->nbuffers--;
142         }
143
144         for (i = 0; i < cam->nbuffers; i++) {
145                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
146                 cam->frame[i].buf.index = i;
147                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
148                 cam->frame[i].buf.length = imagesize;
149                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
150                 cam->frame[i].buf.sequence = 0;
151                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
152                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
153                 cam->frame[i].buf.flags = 0;
154         }
155
156         return cam->nbuffers;
157 }
158
159
160 static void zc0301_release_buffers(struct zc0301_device* cam)
161 {
162         if (cam->nbuffers) {
163                 vfree(cam->frame[0].bufmem);
164                 cam->nbuffers = 0;
165         }
166         cam->frame_current = NULL;
167 }
168
169
170 static void zc0301_empty_framequeues(struct zc0301_device* cam)
171 {
172         u32 i;
173
174         INIT_LIST_HEAD(&cam->inqueue);
175         INIT_LIST_HEAD(&cam->outqueue);
176
177         for (i = 0; i < ZC0301_MAX_FRAMES; i++) {
178                 cam->frame[i].state = F_UNUSED;
179                 cam->frame[i].buf.bytesused = 0;
180         }
181 }
182
183
184 static void zc0301_requeue_outqueue(struct zc0301_device* cam)
185 {
186         struct zc0301_frame_t *i;
187
188         list_for_each_entry(i, &cam->outqueue, frame) {
189                 i->state = F_QUEUED;
190                 list_add(&i->frame, &cam->inqueue);
191         }
192
193         INIT_LIST_HEAD(&cam->outqueue);
194 }
195
196
197 static void zc0301_queue_unusedframes(struct zc0301_device* cam)
198 {
199         unsigned long lock_flags;
200         u32 i;
201
202         for (i = 0; i < cam->nbuffers; i++)
203                 if (cam->frame[i].state == F_UNUSED) {
204                         cam->frame[i].state = F_QUEUED;
205                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
206                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
207                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
208                 }
209 }
210
211 /*****************************************************************************/
212
213 int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value)
214 {
215         struct usb_device* udev = cam->usbdev;
216         int res;
217
218         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40,
219                               value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
220         if (res < 0) {
221                 DBG(3, "Failed to write a register (index 0x%04X, "
222                        "value 0x%02X, error %d)",index, value, res);
223                 return -1;
224         }
225
226         return 0;
227 }
228
229
230 int zc0301_read_reg(struct zc0301_device* cam, u16 index)
231 {
232         struct usb_device* udev = cam->usbdev;
233         u8* buff = cam->control_buffer;
234         int res;
235
236         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0,
237                               0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
238         if (res < 0)
239                 DBG(3, "Failed to read a register (index 0x%04X, error %d)",
240                     index, res);
241
242         PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff));
243
244         return (res >= 0) ? (int)(*buff) : -1;
245 }
246
247
248 int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length)
249 {
250         int err = 0, res, r0, r1;
251
252         err += zc0301_write_reg(cam, 0x0092, address);
253         err += zc0301_write_reg(cam, 0x0090, 0x02);
254
255         msleep(1);
256
257         res = zc0301_read_reg(cam, 0x0091);
258         if (res < 0)
259                 err += res;
260         r0 = zc0301_read_reg(cam, 0x0095);
261         if (r0 < 0)
262                 err += r0;
263         r1 = zc0301_read_reg(cam, 0x0096);
264         if (r1 < 0)
265                 err += r1;
266
267         res = (length <= 1) ? r0 : r0 | (r1 << 8);
268
269         if (err)
270                 DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X",
271                     address, res);
272
273
274         PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res);
275
276         return err ? -1 : res;
277 }
278
279
280 int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value)
281 {
282         int err = 0, res;
283
284         err += zc0301_write_reg(cam, 0x0092, address);
285         err += zc0301_write_reg(cam, 0x0093, value & 0xff);
286         err += zc0301_write_reg(cam, 0x0094, value >> 8);
287         err += zc0301_write_reg(cam, 0x0090, 0x01);
288
289         msleep(1);
290
291         res = zc0301_read_reg(cam, 0x0091);
292         if (res < 0)
293                 err += res;
294
295         if (err)
296                 DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X",
297                     address, value);
298
299         PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value);
300
301         return err ? -1 : 0;
302 }
303
304 /*****************************************************************************/
305
306 static void zc0301_urb_complete(struct urb *urb)
307 {
308         struct zc0301_device* cam = urb->context;
309         struct zc0301_frame_t** f;
310         size_t imagesize;
311         u8 i;
312         int err = 0;
313
314         if (urb->status == -ENOENT)
315                 return;
316
317         f = &cam->frame_current;
318
319         if (cam->stream == STREAM_INTERRUPT) {
320                 cam->stream = STREAM_OFF;
321                 if ((*f))
322                         (*f)->state = F_QUEUED;
323                 DBG(3, "Stream interrupted");
324                 wake_up(&cam->wait_stream);
325         }
326
327         if (cam->state & DEV_DISCONNECTED)
328                 return;
329
330         if (cam->state & DEV_MISCONFIGURED) {
331                 wake_up_interruptible(&cam->wait_frame);
332                 return;
333         }
334
335         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
336                 goto resubmit_urb;
337
338         if (!(*f))
339                 (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t,
340                                   frame);
341
342         imagesize = (cam->sensor.pix_format.width *
343                      cam->sensor.pix_format.height *
344                      cam->sensor.pix_format.priv) / 8;
345
346         for (i = 0; i < urb->number_of_packets; i++) {
347                 unsigned int len, status;
348                 void *pos;
349                 u16* soi;
350                 u8 sof;
351
352                 len = urb->iso_frame_desc[i].actual_length;
353                 status = urb->iso_frame_desc[i].status;
354                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
355
356                 if (status) {
357                         DBG(3, "Error in isochronous frame");
358                         (*f)->state = F_ERROR;
359                         continue;
360                 }
361
362                 sof = (*(soi = pos) == 0xd8ff);
363
364                 PDBGG("Isochrnous frame: length %u, #%u i,", len, i);
365
366                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
367 start_of_frame:
368                         if (sof) {
369                                 (*f)->state = F_GRABBING;
370                                 (*f)->buf.bytesused = 0;
371                                 do_gettimeofday(&(*f)->buf.timestamp);
372                                 DBG(3, "SOF detected: new video frame");
373                         }
374
375                 if ((*f)->state == F_GRABBING) {
376                         if (sof && (*f)->buf.bytesused)
377                                         goto end_of_frame;
378
379                         if ((*f)->buf.bytesused + len > imagesize) {
380                                 DBG(3, "Video frame size exceeded");
381                                 (*f)->state = F_ERROR;
382                                 continue;
383                         }
384
385                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len);
386                         (*f)->buf.bytesused += len;
387
388                         if ((*f)->buf.bytesused == imagesize) {
389                                 u32 b;
390 end_of_frame:
391                                 b = (*f)->buf.bytesused;
392                                 (*f)->state = F_DONE;
393                                 (*f)->buf.sequence= ++cam->frame_count;
394                                 spin_lock(&cam->queue_lock);
395                                 list_move_tail(&(*f)->frame, &cam->outqueue);
396                                 if (!list_empty(&cam->inqueue))
397                                         (*f) = list_entry(cam->inqueue.next,
398                                                        struct zc0301_frame_t,
399                                                           frame);
400                                 else
401                                         (*f) = NULL;
402                                 spin_unlock(&cam->queue_lock);
403                                 DBG(3, "Video frame captured: : %lu bytes",
404                                        (unsigned long)(b));
405
406                                 if (!(*f))
407                                         goto resubmit_urb;
408
409                                 if (sof)
410                                         goto start_of_frame;
411                         }
412                 }
413         }
414
415 resubmit_urb:
416         urb->dev = cam->usbdev;
417         err = usb_submit_urb(urb, GFP_ATOMIC);
418         if (err < 0 && err != -EPERM) {
419                 cam->state |= DEV_MISCONFIGURED;
420                 DBG(1, "usb_submit_urb() failed");
421         }
422
423         wake_up_interruptible(&cam->wait_frame);
424 }
425
426
427 static int zc0301_start_transfer(struct zc0301_device* cam)
428 {
429         struct usb_device *udev = cam->usbdev;
430         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
431                                                      usb_ifnum_to_if(udev, 0),
432                                                      ZC0301_ALTERNATE_SETTING);
433         const unsigned int psz = le16_to_cpu(altsetting->
434                                              endpoint[0].desc.wMaxPacketSize);
435         struct urb* urb;
436         s8 i, j;
437         int err = 0;
438
439         for (i = 0; i < ZC0301_URBS; i++) {
440                 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
441                                                   GFP_KERNEL);
442                 if (!cam->transfer_buffer[i]) {
443                         err = -ENOMEM;
444                         DBG(1, "Not enough memory");
445                         goto free_buffers;
446                 }
447         }
448
449         for (i = 0; i < ZC0301_URBS; i++) {
450                 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
451                 cam->urb[i] = urb;
452                 if (!urb) {
453                         err = -ENOMEM;
454                         DBG(1, "usb_alloc_urb() failed");
455                         goto free_urbs;
456                 }
457                 urb->dev = udev;
458                 urb->context = cam;
459                 urb->pipe = usb_rcvisocpipe(udev, 1);
460                 urb->transfer_flags = URB_ISO_ASAP;
461                 urb->number_of_packets = ZC0301_ISO_PACKETS;
462                 urb->complete = zc0301_urb_complete;
463                 urb->transfer_buffer = cam->transfer_buffer[i];
464                 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
465                 urb->interval = 1;
466                 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
467                         urb->iso_frame_desc[j].offset = psz * j;
468                         urb->iso_frame_desc[j].length = psz;
469                 }
470         }
471
472         err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
473         if (err) {
474                 DBG(1, "usb_set_interface() failed");
475                 goto free_urbs;
476         }
477
478         cam->frame_current = NULL;
479
480         for (i = 0; i < ZC0301_URBS; i++) {
481                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
482                 if (err) {
483                         for (j = i-1; j >= 0; j--)
484                                 usb_kill_urb(cam->urb[j]);
485                         DBG(1, "usb_submit_urb() failed, error %d", err);
486                         goto free_urbs;
487                 }
488         }
489
490         return 0;
491
492 free_urbs:
493         for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
494                 usb_free_urb(cam->urb[i]);
495
496 free_buffers:
497         for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
498                 kfree(cam->transfer_buffer[i]);
499
500         return err;
501 }
502
503
504 static int zc0301_stop_transfer(struct zc0301_device* cam)
505 {
506         struct usb_device *udev = cam->usbdev;
507         s8 i;
508         int err = 0;
509
510         if (cam->state & DEV_DISCONNECTED)
511                 return 0;
512
513         for (i = ZC0301_URBS-1; i >= 0; i--) {
514                 usb_kill_urb(cam->urb[i]);
515                 usb_free_urb(cam->urb[i]);
516                 kfree(cam->transfer_buffer[i]);
517         }
518
519         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
520         if (err)
521                 DBG(3, "usb_set_interface() failed");
522
523         return err;
524 }
525
526
527 static int zc0301_stream_interrupt(struct zc0301_device* cam)
528 {
529         long timeout;
530
531         cam->stream = STREAM_INTERRUPT;
532         timeout = wait_event_timeout(cam->wait_stream,
533                                      (cam->stream == STREAM_OFF) ||
534                                      (cam->state & DEV_DISCONNECTED),
535                                      ZC0301_URB_TIMEOUT);
536         if (cam->state & DEV_DISCONNECTED)
537                 return -ENODEV;
538         else if (cam->stream != STREAM_OFF) {
539                 cam->state |= DEV_MISCONFIGURED;
540                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
541                        "use it, close and open /dev/video%d again.",
542                     cam->v4ldev->minor);
543                 return -EIO;
544         }
545
546         return 0;
547 }
548
549 /*****************************************************************************/
550
551 static int
552 zc0301_set_compression(struct zc0301_device* cam,
553                        struct v4l2_jpegcompression* compression)
554 {
555         int r, err = 0;
556
557         if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
558                 err += r;
559         err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
560
561         return err ? -EIO : 0;
562 }
563
564
565 static int zc0301_init(struct zc0301_device* cam)
566 {
567         struct zc0301_sensor* s = &cam->sensor;
568         struct v4l2_control ctrl;
569         struct v4l2_queryctrl *qctrl;
570         struct v4l2_rect* rect;
571         u8 i = 0;
572         int err = 0;
573
574         if (!(cam->state & DEV_INITIALIZED)) {
575                 mutex_init(&cam->open_mutex);
576                 init_waitqueue_head(&cam->wait_open);
577                 qctrl = s->qctrl;
578                 rect = &(s->cropcap.defrect);
579                 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
580         } else { /* use current values */
581                 qctrl = s->_qctrl;
582                 rect = &(s->_rect);
583         }
584
585         if (s->init) {
586                 err = s->init(cam);
587                 if (err) {
588                         DBG(3, "Sensor initialization failed");
589                         return err;
590                 }
591         }
592
593         if ((err = zc0301_set_compression(cam, &cam->compression))) {
594                 DBG(3, "set_compression() failed");
595                 return err;
596         }
597
598         if (s->set_crop)
599                 if ((err = s->set_crop(cam, rect))) {
600                         DBG(3, "set_crop() failed");
601                         return err;
602                 }
603
604         if (s->set_ctrl) {
605                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
606                         if (s->qctrl[i].id != 0 &&
607                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
608                                 ctrl.id = s->qctrl[i].id;
609                                 ctrl.value = qctrl[i].default_value;
610                                 err = s->set_ctrl(cam, &ctrl);
611                                 if (err) {
612                                         DBG(3, "Set %s control failed",
613                                             s->qctrl[i].name);
614                                         return err;
615                                 }
616                                 DBG(3, "Image sensor supports '%s' control",
617                                     s->qctrl[i].name);
618                         }
619         }
620
621         if (!(cam->state & DEV_INITIALIZED)) {
622                 mutex_init(&cam->fileop_mutex);
623                 spin_lock_init(&cam->queue_lock);
624                 init_waitqueue_head(&cam->wait_frame);
625                 init_waitqueue_head(&cam->wait_stream);
626                 cam->nreadbuffers = 2;
627                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
628                 memcpy(&(s->_rect), &(s->cropcap.defrect),
629                        sizeof(struct v4l2_rect));
630                 cam->state |= DEV_INITIALIZED;
631         }
632
633         DBG(2, "Initialization succeeded");
634         return 0;
635 }
636
637 /*****************************************************************************/
638
639 static void zc0301_release_resources(struct kref *kref)
640 {
641         struct zc0301_device *cam = container_of(kref, struct zc0301_device,
642                                                  kref);
643         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
644         video_set_drvdata(cam->v4ldev, NULL);
645         video_unregister_device(cam->v4ldev);
646         usb_put_dev(cam->usbdev);
647         kfree(cam->control_buffer);
648         kfree(cam);
649 }
650
651
652 static int zc0301_open(struct inode* inode, struct file* filp)
653 {
654         struct zc0301_device* cam;
655         int err = 0;
656
657         if (!down_read_trylock(&zc0301_dev_lock))
658                 return -EAGAIN;
659
660         cam = video_drvdata(filp);
661
662         if (wait_for_completion_interruptible(&cam->probe)) {
663                 up_read(&zc0301_dev_lock);
664                 return -ERESTARTSYS;
665         }
666
667         kref_get(&cam->kref);
668
669         if (mutex_lock_interruptible(&cam->open_mutex)) {
670                 kref_put(&cam->kref, zc0301_release_resources);
671                 up_read(&zc0301_dev_lock);
672                 return -ERESTARTSYS;
673         }
674
675         if (cam->state & DEV_DISCONNECTED) {
676                 DBG(1, "Device not present");
677                 err = -ENODEV;
678                 goto out;
679         }
680
681         if (cam->users) {
682                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
683                 DBG(3, "Simultaneous opens are not supported");
684                 if ((filp->f_flags & O_NONBLOCK) ||
685                     (filp->f_flags & O_NDELAY)) {
686                         err = -EWOULDBLOCK;
687                         goto out;
688                 }
689                 DBG(2, "A blocking open() has been requested. Wait for the "
690                        "device to be released...");
691                 up_read(&zc0301_dev_lock);
692                 err = wait_event_interruptible_exclusive(cam->wait_open,
693                                                 (cam->state & DEV_DISCONNECTED)
694                                                          || !cam->users);
695                 down_read(&zc0301_dev_lock);
696                 if (err)
697                         goto out;
698                 if (cam->state & DEV_DISCONNECTED) {
699                         err = -ENODEV;
700                         goto out;
701                 }
702         }
703
704         if (cam->state & DEV_MISCONFIGURED) {
705                 err = zc0301_init(cam);
706                 if (err) {
707                         DBG(1, "Initialization failed again. "
708                                "I will retry on next open().");
709                         goto out;
710                 }
711                 cam->state &= ~DEV_MISCONFIGURED;
712         }
713
714         if ((err = zc0301_start_transfer(cam)))
715                 goto out;
716
717         filp->private_data = cam;
718         cam->users++;
719         cam->io = IO_NONE;
720         cam->stream = STREAM_OFF;
721         cam->nbuffers = 0;
722         cam->frame_count = 0;
723         zc0301_empty_framequeues(cam);
724
725         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
726
727 out:
728         mutex_unlock(&cam->open_mutex);
729         if (err)
730                 kref_put(&cam->kref, zc0301_release_resources);
731         up_read(&zc0301_dev_lock);
732         return err;
733 }
734
735
736 static int zc0301_release(struct inode* inode, struct file* filp)
737 {
738         struct zc0301_device* cam;
739
740         down_write(&zc0301_dev_lock);
741
742         cam = video_drvdata(filp);
743
744         zc0301_stop_transfer(cam);
745         zc0301_release_buffers(cam);
746         cam->users--;
747         wake_up_interruptible_nr(&cam->wait_open, 1);
748
749         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
750
751         kref_put(&cam->kref, zc0301_release_resources);
752
753         up_write(&zc0301_dev_lock);
754
755         return 0;
756 }
757
758
759 static ssize_t
760 zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
761 {
762         struct zc0301_device *cam = video_drvdata(filp);
763         struct zc0301_frame_t* f, * i;
764         unsigned long lock_flags;
765         long timeout;
766         int err = 0;
767
768         if (mutex_lock_interruptible(&cam->fileop_mutex))
769                 return -ERESTARTSYS;
770
771         if (cam->state & DEV_DISCONNECTED) {
772                 DBG(1, "Device not present");
773                 mutex_unlock(&cam->fileop_mutex);
774                 return -ENODEV;
775         }
776
777         if (cam->state & DEV_MISCONFIGURED) {
778                 DBG(1, "The camera is misconfigured. Close and open it "
779                        "again.");
780                 mutex_unlock(&cam->fileop_mutex);
781                 return -EIO;
782         }
783
784         if (cam->io == IO_MMAP) {
785                 DBG(3, "Close and open the device again to choose the read "
786                        "method");
787                 mutex_unlock(&cam->fileop_mutex);
788                 return -EBUSY;
789         }
790
791         if (cam->io == IO_NONE) {
792                 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
793                         DBG(1, "read() failed, not enough memory");
794                         mutex_unlock(&cam->fileop_mutex);
795                         return -ENOMEM;
796                 }
797                 cam->io = IO_READ;
798                 cam->stream = STREAM_ON;
799         }
800
801         if (list_empty(&cam->inqueue)) {
802                 if (!list_empty(&cam->outqueue))
803                         zc0301_empty_framequeues(cam);
804                 zc0301_queue_unusedframes(cam);
805         }
806
807         if (!count) {
808                 mutex_unlock(&cam->fileop_mutex);
809                 return 0;
810         }
811
812         if (list_empty(&cam->outqueue)) {
813                 if (filp->f_flags & O_NONBLOCK) {
814                         mutex_unlock(&cam->fileop_mutex);
815                         return -EAGAIN;
816                 }
817                 timeout = wait_event_interruptible_timeout
818                           ( cam->wait_frame,
819                             (!list_empty(&cam->outqueue)) ||
820                             (cam->state & DEV_DISCONNECTED) ||
821                             (cam->state & DEV_MISCONFIGURED),
822                             cam->module_param.frame_timeout *
823                             1000 * msecs_to_jiffies(1) );
824                 if (timeout < 0) {
825                         mutex_unlock(&cam->fileop_mutex);
826                         return timeout;
827                 }
828                 if (cam->state & DEV_DISCONNECTED) {
829                         mutex_unlock(&cam->fileop_mutex);
830                         return -ENODEV;
831                 }
832                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
833                         mutex_unlock(&cam->fileop_mutex);
834                         return -EIO;
835                 }
836         }
837
838         f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
839
840         if (count > f->buf.bytesused)
841                 count = f->buf.bytesused;
842
843         if (copy_to_user(buf, f->bufmem, count)) {
844                 err = -EFAULT;
845                 goto exit;
846         }
847         *f_pos += count;
848
849 exit:
850         spin_lock_irqsave(&cam->queue_lock, lock_flags);
851         list_for_each_entry(i, &cam->outqueue, frame)
852                 i->state = F_UNUSED;
853         INIT_LIST_HEAD(&cam->outqueue);
854         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
855
856         zc0301_queue_unusedframes(cam);
857
858         PDBGG("Frame #%lu, bytes read: %zu",
859               (unsigned long)f->buf.index, count);
860
861         mutex_unlock(&cam->fileop_mutex);
862
863         return err ? err : count;
864 }
865
866
867 static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
868 {
869         struct zc0301_device *cam = video_drvdata(filp);
870         struct zc0301_frame_t* f;
871         unsigned long lock_flags;
872         unsigned int mask = 0;
873
874         if (mutex_lock_interruptible(&cam->fileop_mutex))
875                 return POLLERR;
876
877         if (cam->state & DEV_DISCONNECTED) {
878                 DBG(1, "Device not present");
879                 goto error;
880         }
881
882         if (cam->state & DEV_MISCONFIGURED) {
883                 DBG(1, "The camera is misconfigured. Close and open it "
884                        "again.");
885                 goto error;
886         }
887
888         if (cam->io == IO_NONE) {
889                 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
890                         DBG(1, "poll() failed, not enough memory");
891                         goto error;
892                 }
893                 cam->io = IO_READ;
894                 cam->stream = STREAM_ON;
895         }
896
897         if (cam->io == IO_READ) {
898                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
899                 list_for_each_entry(f, &cam->outqueue, frame)
900                         f->state = F_UNUSED;
901                 INIT_LIST_HEAD(&cam->outqueue);
902                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
903                 zc0301_queue_unusedframes(cam);
904         }
905
906         poll_wait(filp, &cam->wait_frame, wait);
907
908         if (!list_empty(&cam->outqueue))
909                 mask |= POLLIN | POLLRDNORM;
910
911         mutex_unlock(&cam->fileop_mutex);
912
913         return mask;
914
915 error:
916         mutex_unlock(&cam->fileop_mutex);
917         return POLLERR;
918 }
919
920
921 static void zc0301_vm_open(struct vm_area_struct* vma)
922 {
923         struct zc0301_frame_t* f = vma->vm_private_data;
924         f->vma_use_count++;
925 }
926
927
928 static void zc0301_vm_close(struct vm_area_struct* vma)
929 {
930         /* NOTE: buffers are not freed here */
931         struct zc0301_frame_t* f = vma->vm_private_data;
932         f->vma_use_count--;
933 }
934
935
936 static struct vm_operations_struct zc0301_vm_ops = {
937         .open = zc0301_vm_open,
938         .close = zc0301_vm_close,
939 };
940
941
942 static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
943 {
944         struct zc0301_device *cam = video_drvdata(filp);
945         unsigned long size = vma->vm_end - vma->vm_start,
946                       start = vma->vm_start;
947         void *pos;
948         u32 i;
949
950         if (mutex_lock_interruptible(&cam->fileop_mutex))
951                 return -ERESTARTSYS;
952
953         if (cam->state & DEV_DISCONNECTED) {
954                 DBG(1, "Device not present");
955                 mutex_unlock(&cam->fileop_mutex);
956                 return -ENODEV;
957         }
958
959         if (cam->state & DEV_MISCONFIGURED) {
960                 DBG(1, "The camera is misconfigured. Close and open it "
961                        "again.");
962                 mutex_unlock(&cam->fileop_mutex);
963                 return -EIO;
964         }
965
966         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
967                 mutex_unlock(&cam->fileop_mutex);
968                 return -EACCES;
969         }
970
971         if (cam->io != IO_MMAP ||
972             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
973                 mutex_unlock(&cam->fileop_mutex);
974                 return -EINVAL;
975         }
976
977         for (i = 0; i < cam->nbuffers; i++) {
978                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
979                         break;
980         }
981         if (i == cam->nbuffers) {
982                 mutex_unlock(&cam->fileop_mutex);
983                 return -EINVAL;
984         }
985
986         vma->vm_flags |= VM_IO;
987         vma->vm_flags |= VM_RESERVED;
988
989         pos = cam->frame[i].bufmem;
990         while (size > 0) { /* size is page-aligned */
991                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
992                         mutex_unlock(&cam->fileop_mutex);
993                         return -EAGAIN;
994                 }
995                 start += PAGE_SIZE;
996                 pos += PAGE_SIZE;
997                 size -= PAGE_SIZE;
998         }
999
1000         vma->vm_ops = &zc0301_vm_ops;
1001         vma->vm_private_data = &cam->frame[i];
1002         zc0301_vm_open(vma);
1003
1004         mutex_unlock(&cam->fileop_mutex);
1005
1006         return 0;
1007 }
1008
1009 /*****************************************************************************/
1010
1011 static int
1012 zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
1013 {
1014         struct v4l2_capability cap = {
1015                 .driver = "zc0301",
1016                 .version = ZC0301_MODULE_VERSION_CODE,
1017                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1018                                 V4L2_CAP_STREAMING,
1019         };
1020
1021         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1022         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1023                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1024                         sizeof(cap.bus_info));
1025
1026         if (copy_to_user(arg, &cap, sizeof(cap)))
1027                 return -EFAULT;
1028
1029         return 0;
1030 }
1031
1032
1033 static int
1034 zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1035 {
1036         struct v4l2_input i;
1037
1038         if (copy_from_user(&i, arg, sizeof(i)))
1039                 return -EFAULT;
1040
1041         if (i.index)
1042                 return -EINVAL;
1043
1044         memset(&i, 0, sizeof(i));
1045         strcpy(i.name, "Camera");
1046         i.type = V4L2_INPUT_TYPE_CAMERA;
1047
1048         if (copy_to_user(arg, &i, sizeof(i)))
1049                 return -EFAULT;
1050
1051         return 0;
1052 }
1053
1054
1055 static int
1056 zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
1057 {
1058         int index = 0;
1059
1060         if (copy_to_user(arg, &index, sizeof(index)))
1061                 return -EFAULT;
1062
1063         return 0;
1064 }
1065
1066
1067 static int
1068 zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
1069 {
1070         int index;
1071
1072         if (copy_from_user(&index, arg, sizeof(index)))
1073                 return -EFAULT;
1074
1075         if (index != 0)
1076                 return -EINVAL;
1077
1078         return 0;
1079 }
1080
1081
1082 static int
1083 zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1084 {
1085         struct zc0301_sensor* s = &cam->sensor;
1086         struct v4l2_queryctrl qc;
1087         u8 i;
1088
1089         if (copy_from_user(&qc, arg, sizeof(qc)))
1090                 return -EFAULT;
1091
1092         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1093                 if (qc.id && qc.id == s->qctrl[i].id) {
1094                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1095                         if (copy_to_user(arg, &qc, sizeof(qc)))
1096                                 return -EFAULT;
1097                         return 0;
1098                 }
1099
1100         return -EINVAL;
1101 }
1102
1103
1104 static int
1105 zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1106 {
1107         struct zc0301_sensor* s = &cam->sensor;
1108         struct v4l2_control ctrl;
1109         int err = 0;
1110         u8 i;
1111
1112         if (!s->get_ctrl && !s->set_ctrl)
1113                 return -EINVAL;
1114
1115         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1116                 return -EFAULT;
1117
1118         if (!s->get_ctrl) {
1119                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1120                         if (ctrl.id == s->qctrl[i].id) {
1121                                 ctrl.value = s->_qctrl[i].default_value;
1122                                 goto exit;
1123                         }
1124                 return -EINVAL;
1125         } else
1126                 err = s->get_ctrl(cam, &ctrl);
1127
1128 exit:
1129         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1130                 return -EFAULT;
1131
1132         return err;
1133 }
1134
1135
1136 static int
1137 zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1138 {
1139         struct zc0301_sensor* s = &cam->sensor;
1140         struct v4l2_control ctrl;
1141         u8 i;
1142         int err = 0;
1143
1144         if (!s->set_ctrl)
1145                 return -EINVAL;
1146
1147         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1148                 return -EFAULT;
1149
1150         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1151                 if (ctrl.id == s->qctrl[i].id) {
1152                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1153                                 return -EINVAL;
1154                         if (ctrl.value < s->qctrl[i].minimum ||
1155                             ctrl.value > s->qctrl[i].maximum)
1156                                 return -ERANGE;
1157                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1158                         break;
1159                 }
1160
1161         if ((err = s->set_ctrl(cam, &ctrl)))
1162                 return err;
1163
1164         s->_qctrl[i].default_value = ctrl.value;
1165
1166         return 0;
1167 }
1168
1169
1170 static int
1171 zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1172 {
1173         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1174
1175         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1176         cc->pixelaspect.numerator = 1;
1177         cc->pixelaspect.denominator = 1;
1178
1179         if (copy_to_user(arg, cc, sizeof(*cc)))
1180                 return -EFAULT;
1181
1182         return 0;
1183 }
1184
1185
1186 static int
1187 zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1188 {
1189         struct zc0301_sensor* s = &cam->sensor;
1190         struct v4l2_crop crop = {
1191                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1192         };
1193
1194         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1195
1196         if (copy_to_user(arg, &crop, sizeof(crop)))
1197                 return -EFAULT;
1198
1199         return 0;
1200 }
1201
1202
1203 static int
1204 zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1205 {
1206         struct zc0301_sensor* s = &cam->sensor;
1207         struct v4l2_crop crop;
1208         struct v4l2_rect* rect;
1209         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1210         const enum zc0301_stream_state stream = cam->stream;
1211         const u32 nbuffers = cam->nbuffers;
1212         u32 i;
1213         int err = 0;
1214
1215         if (copy_from_user(&crop, arg, sizeof(crop)))
1216                 return -EFAULT;
1217
1218         rect = &(crop.c);
1219
1220         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1221                 return -EINVAL;
1222
1223         if (cam->module_param.force_munmap)
1224                 for (i = 0; i < cam->nbuffers; i++)
1225                         if (cam->frame[i].vma_use_count) {
1226                                 DBG(3, "VIDIOC_S_CROP failed. "
1227                                        "Unmap the buffers first.");
1228                                 return -EBUSY;
1229                         }
1230
1231         if (!s->set_crop) {
1232                 memcpy(rect, &(s->_rect), sizeof(*rect));
1233                 if (copy_to_user(arg, &crop, sizeof(crop)))
1234                         return -EFAULT;
1235                 return 0;
1236         }
1237
1238         rect->left &= ~7L;
1239         rect->top &= ~7L;
1240         if (rect->width < 8)
1241                 rect->width = 8;
1242         if (rect->height < 8)
1243                 rect->height = 8;
1244         if (rect->width > bounds->width)
1245                 rect->width = bounds->width;
1246         if (rect->height > bounds->height)
1247                 rect->height = bounds->height;
1248         if (rect->left < bounds->left)
1249                 rect->left = bounds->left;
1250         if (rect->top < bounds->top)
1251                 rect->top = bounds->top;
1252         if (rect->left + rect->width > bounds->left + bounds->width)
1253                 rect->left = bounds->left+bounds->width - rect->width;
1254         if (rect->top + rect->height > bounds->top + bounds->height)
1255                 rect->top = bounds->top+bounds->height - rect->height;
1256         rect->width &= ~7L;
1257         rect->height &= ~7L;
1258
1259         if (cam->stream == STREAM_ON)
1260                 if ((err = zc0301_stream_interrupt(cam)))
1261                         return err;
1262
1263         if (copy_to_user(arg, &crop, sizeof(crop))) {
1264                 cam->stream = stream;
1265                 return -EFAULT;
1266         }
1267
1268         if (cam->module_param.force_munmap || cam->io == IO_READ)
1269                 zc0301_release_buffers(cam);
1270
1271         if (s->set_crop)
1272                 err += s->set_crop(cam, rect);
1273
1274         if (err) { /* atomic, no rollback in ioctl() */
1275                 cam->state |= DEV_MISCONFIGURED;
1276                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1277                        "use the camera, close and open /dev/video%d again.",
1278                     cam->v4ldev->minor);
1279                 return -EIO;
1280         }
1281
1282         s->pix_format.width = rect->width;
1283         s->pix_format.height = rect->height;
1284         memcpy(&(s->_rect), rect, sizeof(*rect));
1285
1286         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1287             nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1288                 cam->state |= DEV_MISCONFIGURED;
1289                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1290                        "use the camera, close and open /dev/video%d again.",
1291                     cam->v4ldev->minor);
1292                 return -ENOMEM;
1293         }
1294
1295         if (cam->io == IO_READ)
1296                 zc0301_empty_framequeues(cam);
1297         else if (cam->module_param.force_munmap)
1298                 zc0301_requeue_outqueue(cam);
1299
1300         cam->stream = stream;
1301
1302         return 0;
1303 }
1304
1305
1306 static int
1307 zc0301_vidioc_enum_framesizes(struct zc0301_device* cam, void __user * arg)
1308 {
1309         struct v4l2_frmsizeenum frmsize;
1310
1311         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1312                 return -EFAULT;
1313
1314         if (frmsize.index != 0 && frmsize.index != 1)
1315                 return -EINVAL;
1316
1317         if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG)
1318                 return -EINVAL;
1319
1320         frmsize.type = V4L2_FRMSIZE_TYPE_DISCRETE;
1321
1322         if (frmsize.index == 1) {
1323                 frmsize.discrete.width = cam->sensor.cropcap.defrect.width;
1324                 frmsize.discrete.height = cam->sensor.cropcap.defrect.height;
1325         }
1326         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1327
1328         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1329                 return -EFAULT;
1330
1331         return 0;
1332 }
1333
1334
1335 static int
1336 zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1337 {
1338         struct v4l2_fmtdesc fmtd;
1339
1340         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1341                 return -EFAULT;
1342
1343         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1344                 return -EINVAL;
1345
1346         if (fmtd.index == 0) {
1347                 strcpy(fmtd.description, "JPEG");
1348                 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1349                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1350         } else
1351                 return -EINVAL;
1352
1353         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1354         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1355
1356         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1357                 return -EFAULT;
1358
1359         return 0;
1360 }
1361
1362
1363 static int
1364 zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1365 {
1366         struct v4l2_format format;
1367         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1368
1369         if (copy_from_user(&format, arg, sizeof(format)))
1370                 return -EFAULT;
1371
1372         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1373                 return -EINVAL;
1374
1375         pfmt->bytesperline = 0;
1376         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1377         pfmt->field = V4L2_FIELD_NONE;
1378         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1379
1380         if (copy_to_user(arg, &format, sizeof(format)))
1381                 return -EFAULT;
1382
1383         return 0;
1384 }
1385
1386
1387 static int
1388 zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
1389                         void __user * arg)
1390 {
1391         struct zc0301_sensor* s = &cam->sensor;
1392         struct v4l2_format format;
1393         struct v4l2_pix_format* pix;
1394         struct v4l2_pix_format* pfmt = &(s->pix_format);
1395         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1396         struct v4l2_rect rect;
1397         const enum zc0301_stream_state stream = cam->stream;
1398         const u32 nbuffers = cam->nbuffers;
1399         u32 i;
1400         int err = 0;
1401
1402         if (copy_from_user(&format, arg, sizeof(format)))
1403                 return -EFAULT;
1404
1405         pix = &(format.fmt.pix);
1406
1407         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1408                 return -EINVAL;
1409
1410         memcpy(&rect, &(s->_rect), sizeof(rect));
1411
1412         if (!s->set_crop) {
1413                 pix->width = rect.width;
1414                 pix->height = rect.height;
1415         } else {
1416                 rect.width = pix->width;
1417                 rect.height = pix->height;
1418         }
1419
1420         if (rect.width < 8)
1421                 rect.width = 8;
1422         if (rect.height < 8)
1423                 rect.height = 8;
1424         if (rect.width > bounds->left + bounds->width - rect.left)
1425                 rect.width = bounds->left + bounds->width - rect.left;
1426         if (rect.height > bounds->top + bounds->height - rect.top)
1427                 rect.height = bounds->top + bounds->height - rect.top;
1428         rect.width &= ~7L;
1429         rect.height &= ~7L;
1430
1431         pix->width = rect.width;
1432         pix->height = rect.height;
1433         pix->pixelformat = pfmt->pixelformat;
1434         pix->priv = pfmt->priv;
1435         pix->colorspace = pfmt->colorspace;
1436         pix->bytesperline = 0;
1437         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1438         pix->field = V4L2_FIELD_NONE;
1439
1440         if (cmd == VIDIOC_TRY_FMT) {
1441                 if (copy_to_user(arg, &format, sizeof(format)))
1442                         return -EFAULT;
1443                 return 0;
1444         }
1445
1446         if (cam->module_param.force_munmap)
1447                 for (i = 0; i < cam->nbuffers; i++)
1448                         if (cam->frame[i].vma_use_count) {
1449                                 DBG(3, "VIDIOC_S_FMT failed. "
1450                                        "Unmap the buffers first.");
1451                                 return -EBUSY;
1452                         }
1453
1454         if (cam->stream == STREAM_ON)
1455                 if ((err = zc0301_stream_interrupt(cam)))
1456                         return err;
1457
1458         if (copy_to_user(arg, &format, sizeof(format))) {
1459                 cam->stream = stream;
1460                 return -EFAULT;
1461         }
1462
1463         if (cam->module_param.force_munmap || cam->io == IO_READ)
1464                 zc0301_release_buffers(cam);
1465
1466         if (s->set_crop)
1467                 err += s->set_crop(cam, &rect);
1468
1469         if (err) { /* atomic, no rollback in ioctl() */
1470                 cam->state |= DEV_MISCONFIGURED;
1471                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1472                        "use the camera, close and open /dev/video%d again.",
1473                     cam->v4ldev->minor);
1474                 return -EIO;
1475         }
1476
1477         memcpy(pfmt, pix, sizeof(*pix));
1478         memcpy(&(s->_rect), &rect, sizeof(rect));
1479
1480         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1481             nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1482                 cam->state |= DEV_MISCONFIGURED;
1483                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1484                        "use the camera, close and open /dev/video%d again.",
1485                     cam->v4ldev->minor);
1486                 return -ENOMEM;
1487         }
1488
1489         if (cam->io == IO_READ)
1490                 zc0301_empty_framequeues(cam);
1491         else if (cam->module_param.force_munmap)
1492                 zc0301_requeue_outqueue(cam);
1493
1494         cam->stream = stream;
1495
1496         return 0;
1497 }
1498
1499
1500 static int
1501 zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1502 {
1503         if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1504                 return -EFAULT;
1505
1506         return 0;
1507 }
1508
1509
1510 static int
1511 zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1512 {
1513         struct v4l2_jpegcompression jc;
1514         const enum zc0301_stream_state stream = cam->stream;
1515         int err = 0;
1516
1517         if (copy_from_user(&jc, arg, sizeof(jc)))
1518                 return -EFAULT;
1519
1520         if (jc.quality != 0)
1521                 return -EINVAL;
1522
1523         if (cam->stream == STREAM_ON)
1524                 if ((err = zc0301_stream_interrupt(cam)))
1525                         return err;
1526
1527         err += zc0301_set_compression(cam, &jc);
1528         if (err) { /* atomic, no rollback in ioctl() */
1529                 cam->state |= DEV_MISCONFIGURED;
1530                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1531                        "problems. To use the camera, close and open "
1532                        "/dev/video%d again.", cam->v4ldev->minor);
1533                 return -EIO;
1534         }
1535
1536         cam->compression.quality = jc.quality;
1537
1538         cam->stream = stream;
1539
1540         return 0;
1541 }
1542
1543
1544 static int
1545 zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1546 {
1547         struct v4l2_requestbuffers rb;
1548         u32 i;
1549         int err;
1550
1551         if (copy_from_user(&rb, arg, sizeof(rb)))
1552                 return -EFAULT;
1553
1554         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1555             rb.memory != V4L2_MEMORY_MMAP)
1556                 return -EINVAL;
1557
1558         if (cam->io == IO_READ) {
1559                 DBG(3, "Close and open the device again to choose the mmap "
1560                        "I/O method");
1561                 return -EBUSY;
1562         }
1563
1564         for (i = 0; i < cam->nbuffers; i++)
1565                 if (cam->frame[i].vma_use_count) {
1566                         DBG(3, "VIDIOC_REQBUFS failed. "
1567                                "Previous buffers are still mapped.");
1568                         return -EBUSY;
1569                 }
1570
1571         if (cam->stream == STREAM_ON)
1572                 if ((err = zc0301_stream_interrupt(cam)))
1573                         return err;
1574
1575         zc0301_empty_framequeues(cam);
1576
1577         zc0301_release_buffers(cam);
1578         if (rb.count)
1579                 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1580
1581         if (copy_to_user(arg, &rb, sizeof(rb))) {
1582                 zc0301_release_buffers(cam);
1583                 cam->io = IO_NONE;
1584                 return -EFAULT;
1585         }
1586
1587         cam->io = rb.count ? IO_MMAP : IO_NONE;
1588
1589         return 0;
1590 }
1591
1592
1593 static int
1594 zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1595 {
1596         struct v4l2_buffer b;
1597
1598         if (copy_from_user(&b, arg, sizeof(b)))
1599                 return -EFAULT;
1600
1601         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1602             b.index >= cam->nbuffers || cam->io != IO_MMAP)
1603                 return -EINVAL;
1604
1605         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1606
1607         if (cam->frame[b.index].vma_use_count)
1608                 b.flags |= V4L2_BUF_FLAG_MAPPED;
1609
1610         if (cam->frame[b.index].state == F_DONE)
1611                 b.flags |= V4L2_BUF_FLAG_DONE;
1612         else if (cam->frame[b.index].state != F_UNUSED)
1613                 b.flags |= V4L2_BUF_FLAG_QUEUED;
1614
1615         if (copy_to_user(arg, &b, sizeof(b)))
1616                 return -EFAULT;
1617
1618         return 0;
1619 }
1620
1621
1622 static int
1623 zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1624 {
1625         struct v4l2_buffer b;
1626         unsigned long lock_flags;
1627
1628         if (copy_from_user(&b, arg, sizeof(b)))
1629                 return -EFAULT;
1630
1631         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1632             b.index >= cam->nbuffers || cam->io != IO_MMAP)
1633                 return -EINVAL;
1634
1635         if (cam->frame[b.index].state != F_UNUSED)
1636                 return -EINVAL;
1637
1638         cam->frame[b.index].state = F_QUEUED;
1639
1640         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1641         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1642         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1643
1644         PDBGG("Frame #%lu queued", (unsigned long)b.index);
1645
1646         return 0;
1647 }
1648
1649
1650 static int
1651 zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
1652                     void __user * arg)
1653 {
1654         struct v4l2_buffer b;
1655         struct zc0301_frame_t *f;
1656         unsigned long lock_flags;
1657         long timeout;
1658
1659         if (copy_from_user(&b, arg, sizeof(b)))
1660                 return -EFAULT;
1661
1662         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1663                 return -EINVAL;
1664
1665         if (list_empty(&cam->outqueue)) {
1666                 if (cam->stream == STREAM_OFF)
1667                         return -EINVAL;
1668                 if (filp->f_flags & O_NONBLOCK)
1669                         return -EAGAIN;
1670                 timeout = wait_event_interruptible_timeout
1671                           ( cam->wait_frame,
1672                             (!list_empty(&cam->outqueue)) ||
1673                             (cam->state & DEV_DISCONNECTED) ||
1674                             (cam->state & DEV_MISCONFIGURED),
1675                             cam->module_param.frame_timeout *
1676                             1000 * msecs_to_jiffies(1) );
1677                 if (timeout < 0)
1678                         return timeout;
1679                 if (cam->state & DEV_DISCONNECTED)
1680                         return -ENODEV;
1681                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1682                         return -EIO;
1683         }
1684
1685         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1686         f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1687         list_del(cam->outqueue.next);
1688         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1689
1690         f->state = F_UNUSED;
1691
1692         memcpy(&b, &f->buf, sizeof(b));
1693         if (f->vma_use_count)
1694                 b.flags |= V4L2_BUF_FLAG_MAPPED;
1695
1696         if (copy_to_user(arg, &b, sizeof(b)))
1697                 return -EFAULT;
1698
1699         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1700
1701         return 0;
1702 }
1703
1704
1705 static int
1706 zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1707 {
1708         int type;
1709
1710         if (copy_from_user(&type, arg, sizeof(type)))
1711                 return -EFAULT;
1712
1713         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1714                 return -EINVAL;
1715
1716         cam->stream = STREAM_ON;
1717
1718         DBG(3, "Stream on");
1719
1720         return 0;
1721 }
1722
1723
1724 static int
1725 zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1726 {
1727         int type, err;
1728
1729         if (copy_from_user(&type, arg, sizeof(type)))
1730                 return -EFAULT;
1731
1732         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1733                 return -EINVAL;
1734
1735         if (cam->stream == STREAM_ON)
1736                 if ((err = zc0301_stream_interrupt(cam)))
1737                         return err;
1738
1739         zc0301_empty_framequeues(cam);
1740
1741         DBG(3, "Stream off");
1742
1743         return 0;
1744 }
1745
1746
1747 static int
1748 zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1749 {
1750         struct v4l2_streamparm sp;
1751
1752         if (copy_from_user(&sp, arg, sizeof(sp)))
1753                 return -EFAULT;
1754
1755         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1756                 return -EINVAL;
1757
1758         sp.parm.capture.extendedmode = 0;
1759         sp.parm.capture.readbuffers = cam->nreadbuffers;
1760
1761         if (copy_to_user(arg, &sp, sizeof(sp)))
1762                 return -EFAULT;
1763
1764         return 0;
1765 }
1766
1767
1768 static int
1769 zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1770 {
1771         struct v4l2_streamparm sp;
1772
1773         if (copy_from_user(&sp, arg, sizeof(sp)))
1774                 return -EFAULT;
1775
1776         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1777                 return -EINVAL;
1778
1779         sp.parm.capture.extendedmode = 0;
1780
1781         if (sp.parm.capture.readbuffers == 0)
1782                 sp.parm.capture.readbuffers = cam->nreadbuffers;
1783
1784         if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1785                 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1786
1787         if (copy_to_user(arg, &sp, sizeof(sp)))
1788                 return -EFAULT;
1789
1790         cam->nreadbuffers = sp.parm.capture.readbuffers;
1791
1792         return 0;
1793 }
1794
1795
1796 static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
1797                              unsigned int cmd, void __user * arg)
1798 {
1799         struct zc0301_device *cam = video_drvdata(filp);
1800
1801         switch (cmd) {
1802
1803         case VIDIOC_QUERYCAP:
1804                 return zc0301_vidioc_querycap(cam, arg);
1805
1806         case VIDIOC_ENUMINPUT:
1807                 return zc0301_vidioc_enuminput(cam, arg);
1808
1809         case VIDIOC_G_INPUT:
1810                 return zc0301_vidioc_g_input(cam, arg);
1811
1812         case VIDIOC_S_INPUT:
1813                 return zc0301_vidioc_s_input(cam, arg);
1814
1815         case VIDIOC_QUERYCTRL:
1816                 return zc0301_vidioc_query_ctrl(cam, arg);
1817
1818         case VIDIOC_G_CTRL:
1819                 return zc0301_vidioc_g_ctrl(cam, arg);
1820
1821         case VIDIOC_S_CTRL:
1822                 return zc0301_vidioc_s_ctrl(cam, arg);
1823
1824         case VIDIOC_CROPCAP:
1825                 return zc0301_vidioc_cropcap(cam, arg);
1826
1827         case VIDIOC_G_CROP:
1828                 return zc0301_vidioc_g_crop(cam, arg);
1829
1830         case VIDIOC_S_CROP:
1831                 return zc0301_vidioc_s_crop(cam, arg);
1832
1833         case VIDIOC_ENUM_FMT:
1834                 return zc0301_vidioc_enum_fmt(cam, arg);
1835
1836         case VIDIOC_G_FMT:
1837                 return zc0301_vidioc_g_fmt(cam, arg);
1838
1839         case VIDIOC_TRY_FMT:
1840         case VIDIOC_S_FMT:
1841                 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1842
1843         case VIDIOC_ENUM_FRAMESIZES:
1844                 return zc0301_vidioc_enum_framesizes(cam, arg);
1845
1846         case VIDIOC_G_JPEGCOMP:
1847                 return zc0301_vidioc_g_jpegcomp(cam, arg);
1848
1849         case VIDIOC_S_JPEGCOMP:
1850                 return zc0301_vidioc_s_jpegcomp(cam, arg);
1851
1852         case VIDIOC_REQBUFS:
1853                 return zc0301_vidioc_reqbufs(cam, arg);
1854
1855         case VIDIOC_QUERYBUF:
1856                 return zc0301_vidioc_querybuf(cam, arg);
1857
1858         case VIDIOC_QBUF:
1859                 return zc0301_vidioc_qbuf(cam, arg);
1860
1861         case VIDIOC_DQBUF:
1862                 return zc0301_vidioc_dqbuf(cam, filp, arg);
1863
1864         case VIDIOC_STREAMON:
1865                 return zc0301_vidioc_streamon(cam, arg);
1866
1867         case VIDIOC_STREAMOFF:
1868                 return zc0301_vidioc_streamoff(cam, arg);
1869
1870         case VIDIOC_G_PARM:
1871                 return zc0301_vidioc_g_parm(cam, arg);
1872
1873         case VIDIOC_S_PARM:
1874                 return zc0301_vidioc_s_parm(cam, arg);
1875
1876         case VIDIOC_G_STD:
1877         case VIDIOC_S_STD:
1878         case VIDIOC_QUERYSTD:
1879         case VIDIOC_ENUMSTD:
1880         case VIDIOC_QUERYMENU:
1881         case VIDIOC_ENUM_FRAMEINTERVALS:
1882                 return -EINVAL;
1883
1884         default:
1885                 return -EINVAL;
1886
1887         }
1888 }
1889
1890
1891 static int zc0301_ioctl(struct inode* inode, struct file* filp,
1892                         unsigned int cmd, unsigned long arg)
1893 {
1894         struct zc0301_device *cam = video_drvdata(filp);
1895         int err = 0;
1896
1897         if (mutex_lock_interruptible(&cam->fileop_mutex))
1898                 return -ERESTARTSYS;
1899
1900         if (cam->state & DEV_DISCONNECTED) {
1901                 DBG(1, "Device not present");
1902                 mutex_unlock(&cam->fileop_mutex);
1903                 return -ENODEV;
1904         }
1905
1906         if (cam->state & DEV_MISCONFIGURED) {
1907                 DBG(1, "The camera is misconfigured. Close and open it "
1908                        "again.");
1909                 mutex_unlock(&cam->fileop_mutex);
1910                 return -EIO;
1911         }
1912
1913         V4LDBG(3, "zc0301", cmd);
1914
1915         err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
1916
1917         mutex_unlock(&cam->fileop_mutex);
1918
1919         return err;
1920 }
1921
1922
1923 static const struct file_operations zc0301_fops = {
1924         .owner =   THIS_MODULE,
1925         .open =    zc0301_open,
1926         .release = zc0301_release,
1927         .ioctl =   zc0301_ioctl,
1928 #ifdef CONFIG_COMPAT
1929         .compat_ioctl = v4l_compat_ioctl32,
1930 #endif
1931         .read =    zc0301_read,
1932         .poll =    zc0301_poll,
1933         .mmap =    zc0301_mmap,
1934         .llseek =  no_llseek,
1935 };
1936
1937 /*****************************************************************************/
1938
1939 static int
1940 zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1941 {
1942         struct usb_device *udev = interface_to_usbdev(intf);
1943         struct zc0301_device* cam;
1944         static unsigned int dev_nr;
1945         unsigned int i;
1946         int err = 0;
1947
1948         if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1949                 return -ENOMEM;
1950
1951         cam->usbdev = udev;
1952
1953         if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1954                 DBG(1, "kmalloc() failed");
1955                 err = -ENOMEM;
1956                 goto fail;
1957         }
1958
1959         if (!(cam->v4ldev = video_device_alloc())) {
1960                 DBG(1, "video_device_alloc() failed");
1961                 err = -ENOMEM;
1962                 goto fail;
1963         }
1964
1965         DBG(2, "ZC0301[P] Image Processor and Control Chip detected "
1966                "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
1967
1968         for  (i = 0; zc0301_sensor_table[i]; i++) {
1969                 err = zc0301_sensor_table[i](cam);
1970                 if (!err)
1971                         break;
1972         }
1973
1974         if (!err)
1975                 DBG(2, "%s image sensor detected", cam->sensor.name);
1976         else {
1977                 DBG(1, "No supported image sensor detected");
1978                 err = -ENODEV;
1979                 goto fail;
1980         }
1981
1982         if (zc0301_init(cam)) {
1983                 DBG(1, "Initialization failed. I will retry on open().");
1984                 cam->state |= DEV_MISCONFIGURED;
1985         }
1986
1987         strcpy(cam->v4ldev->name, "ZC0301[P] PC Camera");
1988         cam->v4ldev->fops = &zc0301_fops;
1989         cam->v4ldev->minor = video_nr[dev_nr];
1990         cam->v4ldev->release = video_device_release;
1991         cam->v4ldev->parent = &udev->dev;
1992         video_set_drvdata(cam->v4ldev, cam);
1993
1994         init_completion(&cam->probe);
1995
1996         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
1997                                     video_nr[dev_nr]);
1998         if (err) {
1999                 DBG(1, "V4L2 device registration failed");
2000                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2001                         DBG(1, "Free /dev/videoX node not found");
2002                 video_nr[dev_nr] = -1;
2003                 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2004                 complete_all(&cam->probe);
2005                 goto fail;
2006         }
2007
2008         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2009
2010         cam->module_param.force_munmap = force_munmap[dev_nr];
2011         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2012
2013         dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2014
2015         usb_set_intfdata(intf, cam);
2016         kref_init(&cam->kref);
2017         usb_get_dev(cam->usbdev);
2018
2019         complete_all(&cam->probe);
2020
2021         return 0;
2022
2023 fail:
2024         if (cam) {
2025                 kfree(cam->control_buffer);
2026                 if (cam->v4ldev)
2027                         video_device_release(cam->v4ldev);
2028                 kfree(cam);
2029         }
2030         return err;
2031 }
2032
2033
2034 static void zc0301_usb_disconnect(struct usb_interface* intf)
2035 {
2036         struct zc0301_device* cam;
2037
2038         down_write(&zc0301_dev_lock);
2039
2040         cam = usb_get_intfdata(intf);
2041
2042         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2043
2044         if (cam->users) {
2045                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2046                        "memory deallocation are deferred.",
2047                     cam->v4ldev->minor);
2048                 cam->state |= DEV_MISCONFIGURED;
2049                 zc0301_stop_transfer(cam);
2050                 cam->state |= DEV_DISCONNECTED;
2051                 wake_up_interruptible(&cam->wait_frame);
2052                 wake_up(&cam->wait_stream);
2053         } else
2054                 cam->state |= DEV_DISCONNECTED;
2055
2056         wake_up_interruptible_all(&cam->wait_open);
2057
2058         kref_put(&cam->kref, zc0301_release_resources);
2059
2060         up_write(&zc0301_dev_lock);
2061 }
2062
2063
2064 static struct usb_driver zc0301_usb_driver = {
2065         .name =       "zc0301",
2066         .id_table =   zc0301_id_table,
2067         .probe =      zc0301_usb_probe,
2068         .disconnect = zc0301_usb_disconnect,
2069 };
2070
2071 /*****************************************************************************/
2072
2073 static int __init zc0301_module_init(void)
2074 {
2075         int err = 0;
2076
2077         KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2078         KDBG(3, ZC0301_MODULE_AUTHOR);
2079
2080         if ((err = usb_register(&zc0301_usb_driver)))
2081                 KDBG(1, "usb_register() failed");
2082
2083         return err;
2084 }
2085
2086
2087 static void __exit zc0301_module_exit(void)
2088 {
2089         usb_deregister(&zc0301_usb_driver);
2090 }
2091
2092
2093 module_init(zc0301_module_init);
2094 module_exit(zc0301_module_exit);