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V4L/DVB (8779): v4l: fix more incorrect video_register_device result checks
[deliverable/linux.git] / drivers / media / video / usbvideo / vicam.c
CommitLineData
1da177e4
LT		 1/*
2 * USB ViCam WebCam driver
3 * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
4 * Christopher L Cheney (ccheney@cheney.cx),
5 * Pavel Machek (pavel@suse.cz),
6 * John Tyner (jtyner@cs.ucr.edu),
7 * Monroe Williams (monroe@pobox.com)
8 *
9 * Supports 3COM HomeConnect PC Digital WebCam
81409ed0 10 * Supports Compro PS39U WebCam
1da177e4
LT		 11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * This source code is based heavily on the CPiA webcam driver which was
27 * written by Peter Pregler, Scott J. Bertin and Johannes Erdfelt
28 *
29 * Portions of this code were also copied from usbvideo.c
30 *
59c51591 31 * Special thanks to the whole team at Sourceforge for help making
1da177e4
LT		 32 * this driver become a reality. Notably:
33 * Andy Armstrong who reverse engineered the color encoding and
34 * Pavel Machek and Chris Cheney who worked on reverse engineering the
35 * camera controls and wrote the first generation driver.
36 */
37
38#include <linux/kernel.h>
39#include <linux/module.h>
40#include <linux/init.h>
41#include <linux/videodev.h>
42#include <linux/usb.h>
43#include <linux/vmalloc.h>
f894dfd7 44#include <linux/mm.h>
1da177e4 45#include <linux/slab.h>
4186ecf8 46#include <linux/mutex.h>
fb54be87
JS		 47#include <linux/firmware.h>
48#include <linux/ihex.h>
1da177e4
LT		 49#include "usbvideo.h"
50
51// #define VICAM_DEBUG
52
53#ifdef VICAM_DEBUG
4126a8f5 54#define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
1da177e4
LT		 55#define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
56#else
57#define DBG(fmn,args...) do {} while(0)
58#endif
59
60#define DRIVER_AUTHOR "Joe Burks, jburks@wavicle.org"
61#define DRIVER_DESC "ViCam WebCam Driver"
62
63/* Define these values to match your device */
64#define USB_VICAM_VENDOR_ID 0x04c1
65#define USB_VICAM_PRODUCT_ID 0x009d
81409ed0
BB		 66#define USB_COMPRO_VENDOR_ID 0x0602
67#define USB_COMPRO_PRODUCT_ID 0x1001
1da177e4
LT		 68
69#define VICAM_BYTES_PER_PIXEL 3
70#define VICAM_MAX_READ_SIZE (512*242+128)
71#define VICAM_MAX_FRAME_SIZE (VICAM_BYTES_PER_PIXEL*320*240)
72#define VICAM_FRAMES 2
73
74#define VICAM_HEADER_SIZE 64
75
1da177e4
LT		 76/* rvmalloc / rvfree copied from usbvideo.c
77 *
78 * Not sure why these are not yet non-statics which I can reference through
79 * usbvideo.h the same as it is in 2.4.20. I bet this will get fixed sometime
80 * in the future.
d56410e0 81 *
1da177e4
LT		 82*/
83static void *rvmalloc(unsigned long size)
84{
85 void *mem;
86 unsigned long adr;
87
88 size = PAGE_ALIGN(size);
89 mem = vmalloc_32(size);
90 if (!mem)
91 return NULL;
92
93 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
94 adr = (unsigned long) mem;
95 while (size > 0) {
96 SetPageReserved(vmalloc_to_page((void *)adr));
97 adr += PAGE_SIZE;
98 size -= PAGE_SIZE;
99 }
100
101 return mem;
102}
103
104static void rvfree(void *mem, unsigned long size)
105{
106 unsigned long adr;
107
108 if (!mem)
109 return;
110
111 adr = (unsigned long) mem;
112 while ((long) size > 0) {
113 ClearPageReserved(vmalloc_to_page((void *)adr));
114 adr += PAGE_SIZE;
115 size -= PAGE_SIZE;
116 }
117 vfree(mem);
118}
119
120struct vicam_camera {
121 u16 shutter_speed; // capture shutter speed
122 u16 gain; // capture gain
123
124 u8 *raw_image; // raw data captured from the camera
125 u8 *framebuf; // processed data in RGB24 format
126 u8 *cntrlbuf; // area used to send control msgs
127
128 struct video_device vdev; // v4l video device
129 struct usb_device *udev; // usb device
130
131 /* guard against simultaneous accesses to the camera */
4186ecf8 132 struct mutex cam_lock;
1da177e4
LT		 133
134 int is_initialized;
135 u8 open_count;
136 u8 bulkEndpoint;
137 int needsDummyRead;
1da177e4
LT		 138};
139
140static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
141static void vicam_disconnect(struct usb_interface *intf);
142static void read_frame(struct vicam_camera *cam, int framenum);
143static void vicam_decode_color(const u8 *, u8 *);
144
145static int __send_control_msg(struct vicam_camera *cam,
146 u8 request,
147 u16 value,
148 u16 index,
149 unsigned char *cp,
150 u16 size)
151{
152 int status;
153
154 /* cp must be memory that has been allocated by kmalloc */
155
156 status = usb_control_msg(cam->udev,
157 usb_sndctrlpipe(cam->udev, 0),
158 request,
159 USB_DIR_OUT | USB_TYPE_VENDOR |
160 USB_RECIP_DEVICE, value, index,
161 cp, size, 1000);
162
163 status = min(status, 0);
164
165 if (status < 0) {
166 printk(KERN_INFO "Failed sending control message, error %d.\n",
167 status);
168 }
169
170 return status;
171}
172
173static int send_control_msg(struct vicam_camera *cam,
174 u8 request,
175 u16 value,
176 u16 index,
177 unsigned char *cp,
178 u16 size)
179{
180 int status = -ENODEV;
4186ecf8 181 mutex_lock(&cam->cam_lock);
1da177e4
LT		 182 if (cam->udev) {
183 status = __send_control_msg(cam, request, value,
184 index, cp, size);
185 }
4186ecf8 186 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 187 return status;
188}
189static int
190initialize_camera(struct vicam_camera *cam)
191{
fb54be87
JS		 192 int err;
193 const struct ihex_binrec *rec;
194 const struct firmware *fw;
195
196 err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
197 if (err) {
198 printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
199 err);
200 return err;
201 }
202
203 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
204 memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
1da177e4
LT		 205
206 err = send_control_msg(cam, 0xff, 0, 0,
fb54be87
JS		 207 cam->cntrlbuf, be16_to_cpu(rec->len));
208 if (err)
209 break;
1da177e4
LT		 210 }
211
fb54be87
JS		 212 release_firmware(fw);
213
1da177e4
LT		 214 return err;
215}
216
217static int
218set_camera_power(struct vicam_camera *cam, int state)
219{
220 int status;
221
222 if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
223 return status;
224
225 if (state) {
226 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
227 }
228
229 return 0;
230}
231
232static int
233vicam_ioctl(struct inode *inode, struct file *file, unsigned int ioctlnr, unsigned long arg)
234{
235 void __user *user_arg = (void __user *)arg;
236 struct vicam_camera *cam = file->private_data;
237 int retval = 0;
238
239 if (!cam)
240 return -ENODEV;
241
242 switch (ioctlnr) {
243 /* query capabilities */
244 case VIDIOCGCAP:
245 {
246 struct video_capability b;
247
248 DBG("VIDIOCGCAP\n");
249 memset(&b, 0, sizeof(b));
250 strcpy(b.name, "ViCam-based Camera");
251 b.type = VID_TYPE_CAPTURE;
252 b.channels = 1;
253 b.audios = 0;
254 b.maxwidth = 320; /* VIDEOSIZE_CIF */
255 b.maxheight = 240;
256 b.minwidth = 320; /* VIDEOSIZE_48_48 */
257 b.minheight = 240;
258
259 if (copy_to_user(user_arg, &b, sizeof(b)))
260 retval = -EFAULT;
261
262 break;
263 }
264 /* get/set video source - we are a camera and nothing else */
265 case VIDIOCGCHAN:
266 {
267 struct video_channel v;
268
269 DBG("VIDIOCGCHAN\n");
270 if (copy_from_user(&v, user_arg, sizeof(v))) {
271 retval = -EFAULT;
272 break;
273 }
274 if (v.channel != 0) {
275 retval = -EINVAL;
276 break;
277 }
278
279 v.channel = 0;
280 strcpy(v.name, "Camera");
281 v.tuners = 0;
282 v.flags = 0;
283 v.type = VIDEO_TYPE_CAMERA;
284 v.norm = 0;
285
286 if (copy_to_user(user_arg, &v, sizeof(v)))
287 retval = -EFAULT;
288 break;
289 }
290
291 case VIDIOCSCHAN:
292 {
293 int v;
294
295 if (copy_from_user(&v, user_arg, sizeof(v)))
296 retval = -EFAULT;
297 DBG("VIDIOCSCHAN %d\n", v);
298
299 if (retval == 0 && v != 0)
300 retval = -EINVAL;
301
302 break;
303 }
304
305 /* image properties */
306 case VIDIOCGPICT:
307 {
308 struct video_picture vp;
309 DBG("VIDIOCGPICT\n");
310 memset(&vp, 0, sizeof (struct video_picture));
311 vp.brightness = cam->gain << 8;
312 vp.depth = 24;
313 vp.palette = VIDEO_PALETTE_RGB24;
314 if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
315 retval = -EFAULT;
316 break;
317 }
318
319 case VIDIOCSPICT:
320 {
321 struct video_picture vp;
d56410e0 322
1da177e4
LT		 323 if (copy_from_user(&vp, user_arg, sizeof(vp))) {
324 retval = -EFAULT;
325 break;
326 }
d56410e0 327
1da177e4
LT		 328 DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
329 vp.palette);
330
331 cam->gain = vp.brightness >> 8;
332
333 if (vp.depth != 24
334 || vp.palette != VIDEO_PALETTE_RGB24)
335 retval = -EINVAL;
336
337 break;
338 }
339
340 /* get/set capture window */
341 case VIDIOCGWIN:
342 {
343 struct video_window vw;
344 vw.x = 0;
345 vw.y = 0;
346 vw.width = 320;
347 vw.height = 240;
348 vw.chromakey = 0;
349 vw.flags = 0;
350 vw.clips = NULL;
351 vw.clipcount = 0;
352
353 DBG("VIDIOCGWIN\n");
354
355 if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
356 retval = -EFAULT;
357
358 // I'm not sure what the deal with a capture window is, it is very poorly described
359 // in the doc. So I won't support it now.
360 break;
361 }
362
363 case VIDIOCSWIN:
364 {
365
366 struct video_window vw;
367
368 if (copy_from_user(&vw, user_arg, sizeof(vw))) {
369 retval = -EFAULT;
370 break;
371 }
372
373 DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
d56410e0 374
1da177e4
LT		 375 if ( vw.width != 320 || vw.height != 240 )
376 retval = -EFAULT;
377
378 break;
379 }
380
381 /* mmap interface */
382 case VIDIOCGMBUF:
383 {
384 struct video_mbuf vm;
385 int i;
386
387 DBG("VIDIOCGMBUF\n");
388 memset(&vm, 0, sizeof (vm));
389 vm.size =
390 VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
391 vm.frames = VICAM_FRAMES;
392 for (i = 0; i < VICAM_FRAMES; i++)
393 vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
394
395 if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
396 retval = -EFAULT;
397
398 break;
399 }
400
401 case VIDIOCMCAPTURE:
402 {
403 struct video_mmap vm;
404 // int video_size;
405
406 if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
407 retval = -EFAULT;
408 break;
409 }
410
411 DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
412
413 if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
414 retval = -EINVAL;
415
416 // in theory right here we'd start the image capturing
417 // (fill in a bulk urb and submit it asynchronously)
418 //
419 // Instead we're going to do a total hack job for now and
420 // retrieve the frame in VIDIOCSYNC
421
422 break;
423 }
424
425 case VIDIOCSYNC:
426 {
427 int frame;
428
429 if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
430 retval = -EFAULT;
431 break;
432 }
433 DBG("VIDIOCSYNC: %d\n", frame);
434
435 read_frame(cam, frame);
436 vicam_decode_color(cam->raw_image,
437 cam->framebuf +
438 frame * VICAM_MAX_FRAME_SIZE );
439
440 break;
441 }
442
443 /* pointless to implement overlay with this camera */
444 case VIDIOCCAPTURE:
445 case VIDIOCGFBUF:
446 case VIDIOCSFBUF:
447 case VIDIOCKEY:
448 retval = -EINVAL;
449 break;
450
451 /* tuner interface - we have none */
452 case VIDIOCGTUNER:
453 case VIDIOCSTUNER:
454 case VIDIOCGFREQ:
455 case VIDIOCSFREQ:
456 retval = -EINVAL;
457 break;
458
459 /* audio interface - we have none */
460 case VIDIOCGAUDIO:
461 case VIDIOCSAUDIO:
462 retval = -EINVAL;
463 break;
464 default:
465 retval = -ENOIOCTLCMD;
466 break;
467 }
468
469 return retval;
470}
471
472static int
473vicam_open(struct inode *inode, struct file *file)
474{
475 struct video_device *dev = video_devdata(file);
476 struct vicam_camera *cam =
477 (struct vicam_camera *) dev->priv;
478 DBG("open\n");
479
480 if (!cam) {
481 printk(KERN_ERR
482 "vicam video_device improperly initialized");
f88f8295 483 return -EINVAL;
1da177e4
LT		 484 }
485
486 /* the videodev_lock held above us protects us from
487 * simultaneous opens...for now. we probably shouldn't
488 * rely on this fact forever.
489 */
490
491 if (cam->open_count > 0) {
492 printk(KERN_INFO
493 "vicam_open called on already opened camera");
494 return -EBUSY;
495 }
496
497 cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
498 if (!cam->raw_image) {
499 return -ENOMEM;
500 }
501
502 cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
503 if (!cam->framebuf) {
504 kfree(cam->raw_image);
505 return -ENOMEM;
506 }
507
508 cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
509 if (!cam->cntrlbuf) {
510 kfree(cam->raw_image);
511 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
512 return -ENOMEM;
513 }
514
515 // First upload firmware, then turn the camera on
516
517 if (!cam->is_initialized) {
518 initialize_camera(cam);
519
520 cam->is_initialized = 1;
521 }
522
523 set_camera_power(cam, 1);
524
525 cam->needsDummyRead = 1;
526 cam->open_count++;
527
d56410e0
MCC		 528 file->private_data = cam;
529
1da177e4
LT		 530 return 0;
531}
532
d56410e0 533static int
1da177e4
LT		 534vicam_close(struct inode *inode, struct file *file)
535{
536 struct vicam_camera *cam = file->private_data;
537 int open_count;
538 struct usb_device *udev;
539
540 DBG("close\n");
541
542 /* it's not the end of the world if
543 * we fail to turn the camera off.
544 */
545
546 set_camera_power(cam, 0);
547
548 kfree(cam->raw_image);
549 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
550 kfree(cam->cntrlbuf);
551
4186ecf8 552 mutex_lock(&cam->cam_lock);
1da177e4
LT		 553
554 cam->open_count--;
555 open_count = cam->open_count;
556 udev = cam->udev;
557
4186ecf8 558 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 559
560 if (!open_count && !udev) {
561 kfree(cam);
562 }
563
564 return 0;
565}
566
567static void vicam_decode_color(const u8 *data, u8 *rgb)
568{
569 /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
570 * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
571 */
572
573 int i, prevY, nextY;
574
575 prevY = 512;
576 nextY = 512;
577
578 data += VICAM_HEADER_SIZE;
579
580 for( i = 0; i < 240; i++, data += 512 ) {
581 const int y = ( i * 242 ) / 240;
582
583 int j, prevX, nextX;
584 int Y, Cr, Cb;
585
586 if ( y == 242 - 1 ) {
587 nextY = -512;
588 }
589
590 prevX = 1;
591 nextX = 1;
592
593 for ( j = 0; j < 320; j++, rgb += 3 ) {
594 const int x = ( j * 512 ) / 320;
595 const u8 * const src = &data[x];
596
597 if ( x == 512 - 1 ) {
598 nextX = -1;
599 }
600
601 Cr = ( src[prevX] - src[0] ) +
602 ( src[nextX] - src[0] );
603 Cr /= 2;
604
605 Cb = ( src[prevY] - src[prevX + prevY] ) +
606 ( src[prevY] - src[nextX + prevY] ) +
607 ( src[nextY] - src[prevX + nextY] ) +
608 ( src[nextY] - src[nextX + nextY] );
609 Cb /= 4;
610
611 Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
612
613 if ( i & 1 ) {
614 int Ct = Cr;
615 Cr = Cb;
616 Cb = Ct;
617 }
618
619 if ( ( x ^ i ) & 1 ) {
620 Cr = -Cr;
621 Cb = -Cb;
622 }
623
624 rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
625 500 ) / 900, 0, 255 );
626 rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
627 ( 813 * Cr ) ) +
628 500 ) / 1000, 0, 255 );
629 rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
630 500 ) / 1300, 0, 255 );
631
632 prevX = -1;
633 }
634
635 prevY = -512;
636 }
637}
638
639static void
640read_frame(struct vicam_camera *cam, int framenum)
641{
642 unsigned char *request = cam->cntrlbuf;
643 int realShutter;
644 int n;
645 int actual_length;
646
647 if (cam->needsDummyRead) {
648 cam->needsDummyRead = 0;
649 read_frame(cam, framenum);
650 }
651
652 memset(request, 0, 16);
653 request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
654
655 request[1] = 0; // 512x242 capture
656
657 request[2] = 0x90; // the function of these two bytes
658 request[3] = 0x07; // is not yet understood
659
660 if (cam->shutter_speed > 60) {
661 // Short exposure
662 realShutter =
663 ((-15631900 / cam->shutter_speed) + 260533) / 1000;
664 request[4] = realShutter & 0xFF;
665 request[5] = (realShutter >> 8) & 0xFF;
666 request[6] = 0x03;
667 request[7] = 0x01;
668 } else {
669 // Long exposure
670 realShutter = 15600 / cam->shutter_speed - 1;
671 request[4] = 0;
672 request[5] = 0;
673 request[6] = realShutter & 0xFF;
674 request[7] = realShutter >> 8;
675 }
676
96de0e25 677 // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
1da177e4
LT		 678 request[8] = 0;
679 // bytes 9-15 do not seem to affect exposure or image quality
680
4186ecf8 681 mutex_lock(&cam->cam_lock);
1da177e4
LT		 682
683 if (!cam->udev) {
684 goto done;
685 }
686
687 n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
688
689 if (n < 0) {
690 printk(KERN_ERR
691 " Problem sending frame capture control message");
692 goto done;
693 }
694
695 n = usb_bulk_msg(cam->udev,
696 usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
697 cam->raw_image,
698 512 * 242 + 128, &actual_length, 10000);
699
700 if (n < 0) {
701 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
702 n);
703 }
704
705 done:
4186ecf8 706 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 707}
708
709static ssize_t
710vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
711{
712 struct vicam_camera *cam = file->private_data;
713
714 DBG("read %d bytes.\n", (int) count);
715
716 if (*ppos >= VICAM_MAX_FRAME_SIZE) {
717 *ppos = 0;
718 return 0;
719 }
720
721 if (*ppos == 0) {
722 read_frame(cam, 0);
723 vicam_decode_color(cam->raw_image,
724 cam->framebuf +
725 0 * VICAM_MAX_FRAME_SIZE);
726 }
727
728 count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
729
730 if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
731 count = -EFAULT;
732 } else {
733 *ppos += count;
734 }
735
736 if (count == VICAM_MAX_FRAME_SIZE) {
737 *ppos = 0;
738 }
739
740 return count;
741}
742
743
744static int
745vicam_mmap(struct file *file, struct vm_area_struct *vma)
746{
747 // TODO: allocate the raw frame buffer if necessary
748 unsigned long page, pos;
749 unsigned long start = vma->vm_start;
750 unsigned long size = vma->vm_end-vma->vm_start;
751 struct vicam_camera *cam = file->private_data;
752
753 if (!cam)
754 return -ENODEV;
755
756 DBG("vicam_mmap: %ld\n", size);
757
758 /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
759 * to the size the application requested for mmap and it was screwing apps up.
760 if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
761 return -EINVAL;
762 */
763
764 pos = (unsigned long)cam->framebuf;
765 while (size > 0) {
766 page = vmalloc_to_pfn((void *)pos);
767 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
768 return -EAGAIN;
769
770 start += PAGE_SIZE;
771 pos += PAGE_SIZE;
772 if (size > PAGE_SIZE)
773 size -= PAGE_SIZE;
774 else
775 size = 0;
776 }
777
778 return 0;
779}
780
fa027c2a 781static const struct file_operations vicam_fops = {
1da177e4
LT		 782 .owner = THIS_MODULE,
783 .open = vicam_open,
784 .release = vicam_close,
785 .read = vicam_read,
786 .mmap = vicam_mmap,
787 .ioctl = vicam_ioctl,
078ff795 788#ifdef CONFIG_COMPAT
0d0fbf81 789 .compat_ioctl = v4l_compat_ioctl32,
078ff795 790#endif
1da177e4
LT		 791 .llseek = no_llseek,
792};
793
794static struct video_device vicam_template = {
1da177e4 795 .name = "ViCam-based USB Camera",
1da177e4
LT		 796 .fops = &vicam_fops,
797 .minor = -1,
798};
799
800/* table of devices that work with this driver */
801static struct usb_device_id vicam_table[] = {
802 {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
81409ed0 803 {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
1da177e4
LT		 804 {} /* Terminating entry */
805};
806
807MODULE_DEVICE_TABLE(usb, vicam_table);
808
809static struct usb_driver vicam_driver = {
1da177e4
LT		 810 .name = "vicam",
811 .probe = vicam_probe,
812 .disconnect = vicam_disconnect,
813 .id_table = vicam_table
814};
815
816/**
817 * vicam_probe
818 * @intf: the interface
819 * @id: the device id
820 *
821 * Called by the usb core when a new device is connected that it thinks
822 * this driver might be interested in.
823 */
824static int
825vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
826{
827 struct usb_device *dev = interface_to_usbdev(intf);
828 int bulkEndpoint = 0;
829 const struct usb_host_interface *interface;
830 const struct usb_endpoint_descriptor *endpoint;
831 struct vicam_camera *cam;
d56410e0 832
1da177e4
LT		 833 printk(KERN_INFO "ViCam based webcam connected\n");
834
835 interface = intf->cur_altsetting;
836
837 DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
838 interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
839 endpoint = &interface->endpoint[0].desc;
840
841 if ((endpoint->bEndpointAddress & 0x80) &&
842 ((endpoint->bmAttributes & 3) == 0x02)) {
843 /* we found a bulk in endpoint */
844 bulkEndpoint = endpoint->bEndpointAddress;
845 } else {
846 printk(KERN_ERR
847 "No bulk in endpoint was found ?! (this is bad)\n");
848 }
849
850 if ((cam =
dd00cc48 851 kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
1da177e4
LT		 852 printk(KERN_WARNING
853 "could not allocate kernel memory for vicam_camera struct\n");
854 return -ENOMEM;
855 }
856
1da177e4
LT		 857
858 cam->shutter_speed = 15;
859
4186ecf8 860 mutex_init(&cam->cam_lock);
1da177e4
LT		 861
862 memcpy(&cam->vdev, &vicam_template,
863 sizeof (vicam_template));
864 cam->vdev.priv = cam; // sort of a reverse mapping for those functions that get vdev only
865
866 cam->udev = dev;
867 cam->bulkEndpoint = bulkEndpoint;
868
dc60de33 869 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
1da177e4
LT		 870 kfree(cam);
871 printk(KERN_WARNING "video_register_device failed\n");
872 return -EIO;
873 }
874
1da177e4
LT		 875 printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",cam->vdev.minor);
876
877 usb_set_intfdata (intf, cam);
d56410e0 878
1da177e4
LT		 879 return 0;
880}
881
882static void
883vicam_disconnect(struct usb_interface *intf)
884{
885 int open_count;
886 struct vicam_camera *cam = usb_get_intfdata (intf);
887 usb_set_intfdata (intf, NULL);
888
889 /* we must unregister the device before taking its
890 * cam_lock. This is because the video open call
891 * holds the same lock as video unregister. if we
892 * unregister inside of the cam_lock and open also
893 * uses the cam_lock, we get deadlock.
894 */
895
896 video_unregister_device(&cam->vdev);
897
898 /* stop the camera from being used */
899
4186ecf8 900 mutex_lock(&cam->cam_lock);
1da177e4
LT		 901
902 /* mark the camera as gone */
903
904 cam->udev = NULL;
905
1da177e4
LT		 906 /* the only thing left to do is synchronize with
907 * our close/release function on who should release
908 * the camera memory. if there are any users using the
909 * camera, it's their job. if there are no users,
910 * it's ours.
911 */
912
913 open_count = cam->open_count;
914
4186ecf8 915 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 916
917 if (!open_count) {
918 kfree(cam);
919 }
920
921 printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
922}
923
924/*
925 */
926static int __init
927usb_vicam_init(void)
928{
929 int retval;
930 DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
1da177e4
LT		 931 retval = usb_register(&vicam_driver);
932 if (retval)
933 printk(KERN_WARNING "usb_register failed!\n");
934 return retval;
935}
936
937static void __exit
938usb_vicam_exit(void)
939{
940 DBG(KERN_INFO
941 "ViCam-based WebCam driver shutdown\n");
942
943 usb_deregister(&vicam_driver);
1da177e4
LT		 944}
945
946module_init(usb_vicam_init);
947module_exit(usb_vicam_exit);
948
949MODULE_AUTHOR(DRIVER_AUTHOR);
950MODULE_DESCRIPTION(DRIVER_DESC);
951MODULE_LICENSE("GPL");
fb54be87 952MODULE_FIRMWARE("vicam/firmware.fw");
Linux kernel - Deliverables
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