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
10 * Supports Compro PS39U WebCam
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 *
31 * Special thanks to the whole team at Sourceforge for help making
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>
44 #include <linux/mm.h>
45 #include <linux/slab.h>
46 #include <linux/smp_lock.h>
47 #include <linux/mutex.h>
48 #include <linux/firmware.h>
49 #include <linux/ihex.h>
50 #include "usbvideo.h"
51
52 // #define VICAM_DEBUG
53
54 #ifdef VICAM_DEBUG
55 #define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
56 #define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
57 #else
58 #define DBG(fmn,args...) do {} while(0)
59 #endif
60
61 #define DRIVER_AUTHOR "Joe Burks, jburks@wavicle.org"
62 #define DRIVER_DESC "ViCam WebCam Driver"
63
64 /* Define these values to match your device */
65 #define USB_VICAM_VENDOR_ID 0x04c1
66 #define USB_VICAM_PRODUCT_ID 0x009d
67 #define USB_COMPRO_VENDOR_ID 0x0602
68 #define USB_COMPRO_PRODUCT_ID 0x1001
69
70 #define VICAM_BYTES_PER_PIXEL 3
71 #define VICAM_MAX_READ_SIZE (512*242+128)
72 #define VICAM_MAX_FRAME_SIZE (VICAM_BYTES_PER_PIXEL*320*240)
73 #define VICAM_FRAMES 2
74
75 #define VICAM_HEADER_SIZE 64
76
77 /* rvmalloc / rvfree copied from usbvideo.c
78 *
79 * Not sure why these are not yet non-statics which I can reference through
80 * usbvideo.h the same as it is in 2.4.20. I bet this will get fixed sometime
81 * in the future.
82 *
83 */
84 static void *rvmalloc(unsigned long size)
85 {
86 void *mem;
87 unsigned long adr;
88
89 size = PAGE_ALIGN(size);
90 mem = vmalloc_32(size);
91 if (!mem)
92 return NULL;
93
94 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
95 adr = (unsigned long) mem;
96 while (size > 0) {
97 SetPageReserved(vmalloc_to_page((void *)adr));
98 adr += PAGE_SIZE;
99 size -= PAGE_SIZE;
100 }
101
102 return mem;
103 }
104
105 static void rvfree(void *mem, unsigned long size)
106 {
107 unsigned long adr;
108
109 if (!mem)
110 return;
111
112 adr = (unsigned long) mem;
113 while ((long) size > 0) {
114 ClearPageReserved(vmalloc_to_page((void *)adr));
115 adr += PAGE_SIZE;
116 size -= PAGE_SIZE;
117 }
118 vfree(mem);
119 }
120
121 struct vicam_camera {
122 u16 shutter_speed; // capture shutter speed
123 u16 gain; // capture gain
124
125 u8 *raw_image; // raw data captured from the camera
126 u8 *framebuf; // processed data in RGB24 format
127 u8 *cntrlbuf; // area used to send control msgs
128
129 struct video_device vdev; // v4l video device
130 struct usb_device *udev; // usb device
131
132 /* guard against simultaneous accesses to the camera */
133 struct mutex cam_lock;
134
135 int is_initialized;
136 u8 open_count;
137 u8 bulkEndpoint;
138 int needsDummyRead;
139 };
140
141 static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
142 static void vicam_disconnect(struct usb_interface *intf);
143 static void read_frame(struct vicam_camera *cam, int framenum);
144 static void vicam_decode_color(const u8 *, u8 *);
145
146 static int __send_control_msg(struct vicam_camera *cam,
147 u8 request,
148 u16 value,
149 u16 index,
150 unsigned char *cp,
151 u16 size)
152 {
153 int status;
154
155 /* cp must be memory that has been allocated by kmalloc */
156
157 status = usb_control_msg(cam->udev,
158 usb_sndctrlpipe(cam->udev, 0),
159 request,
160 USB_DIR_OUT | USB_TYPE_VENDOR |
161 USB_RECIP_DEVICE, value, index,
162 cp, size, 1000);
163
164 status = min(status, 0);
165
166 if (status < 0) {
167 printk(KERN_INFO "Failed sending control message, error %d.\n",
168 status);
169 }
170
171 return status;
172 }
173
174 static int send_control_msg(struct vicam_camera *cam,
175 u8 request,
176 u16 value,
177 u16 index,
178 unsigned char *cp,
179 u16 size)
180 {
181 int status = -ENODEV;
182 mutex_lock(&cam->cam_lock);
183 if (cam->udev) {
184 status = __send_control_msg(cam, request, value,
185 index, cp, size);
186 }
187 mutex_unlock(&cam->cam_lock);
188 return status;
189 }
190 static int
191 initialize_camera(struct vicam_camera *cam)
192 {
193 int err;
194 const struct ihex_binrec *rec;
195 const struct firmware *uninitialized_var(fw);
196
197 err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
198 if (err) {
199 printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
200 err);
201 return err;
202 }
203
204 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
205 memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
206
207 err = send_control_msg(cam, 0xff, 0, 0,
208 cam->cntrlbuf, be16_to_cpu(rec->len));
209 if (err)
210 break;
211 }
212
213 release_firmware(fw);
214
215 return err;
216 }
217
218 static int
219 set_camera_power(struct vicam_camera *cam, int state)
220 {
221 int status;
222
223 if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
224 return status;
225
226 if (state) {
227 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
228 }
229
230 return 0;
231 }
232
233 static long
234 vicam_ioctl(struct file *file, unsigned int ioctlnr, unsigned long arg)
235 {
236 void __user *user_arg = (void __user *)arg;
237 struct vicam_camera *cam = file->private_data;
238 long retval = 0;
239
240 if (!cam)
241 return -ENODEV;
242
243 switch (ioctlnr) {
244 /* query capabilities */
245 case VIDIOCGCAP:
246 {
247 struct video_capability b;
248
249 DBG("VIDIOCGCAP\n");
250 memset(&b, 0, sizeof(b));
251 strcpy(b.name, "ViCam-based Camera");
252 b.type = VID_TYPE_CAPTURE;
253 b.channels = 1;
254 b.audios = 0;
255 b.maxwidth = 320; /* VIDEOSIZE_CIF */
256 b.maxheight = 240;
257 b.minwidth = 320; /* VIDEOSIZE_48_48 */
258 b.minheight = 240;
259
260 if (copy_to_user(user_arg, &b, sizeof(b)))
261 retval = -EFAULT;
262
263 break;
264 }
265 /* get/set video source - we are a camera and nothing else */
266 case VIDIOCGCHAN:
267 {
268 struct video_channel v;
269
270 DBG("VIDIOCGCHAN\n");
271 if (copy_from_user(&v, user_arg, sizeof(v))) {
272 retval = -EFAULT;
273 break;
274 }
275 if (v.channel != 0) {
276 retval = -EINVAL;
277 break;
278 }
279
280 v.channel = 0;
281 strcpy(v.name, "Camera");
282 v.tuners = 0;
283 v.flags = 0;
284 v.type = VIDEO_TYPE_CAMERA;
285 v.norm = 0;
286
287 if (copy_to_user(user_arg, &v, sizeof(v)))
288 retval = -EFAULT;
289 break;
290 }
291
292 case VIDIOCSCHAN:
293 {
294 int v;
295
296 if (copy_from_user(&v, user_arg, sizeof(v)))
297 retval = -EFAULT;
298 DBG("VIDIOCSCHAN %d\n", v);
299
300 if (retval == 0 && v != 0)
301 retval = -EINVAL;
302
303 break;
304 }
305
306 /* image properties */
307 case VIDIOCGPICT:
308 {
309 struct video_picture vp;
310 DBG("VIDIOCGPICT\n");
311 memset(&vp, 0, sizeof (struct video_picture));
312 vp.brightness = cam->gain << 8;
313 vp.depth = 24;
314 vp.palette = VIDEO_PALETTE_RGB24;
315 if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
316 retval = -EFAULT;
317 break;
318 }
319
320 case VIDIOCSPICT:
321 {
322 struct video_picture vp;
323
324 if (copy_from_user(&vp, user_arg, sizeof(vp))) {
325 retval = -EFAULT;
326 break;
327 }
328
329 DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
330 vp.palette);
331
332 cam->gain = vp.brightness >> 8;
333
334 if (vp.depth != 24
335 || vp.palette != VIDEO_PALETTE_RGB24)
336 retval = -EINVAL;
337
338 break;
339 }
340
341 /* get/set capture window */
342 case VIDIOCGWIN:
343 {
344 struct video_window vw;
345 vw.x = 0;
346 vw.y = 0;
347 vw.width = 320;
348 vw.height = 240;
349 vw.chromakey = 0;
350 vw.flags = 0;
351 vw.clips = NULL;
352 vw.clipcount = 0;
353
354 DBG("VIDIOCGWIN\n");
355
356 if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
357 retval = -EFAULT;
358
359 // I'm not sure what the deal with a capture window is, it is very poorly described
360 // in the doc. So I won't support it now.
361 break;
362 }
363
364 case VIDIOCSWIN:
365 {
366
367 struct video_window vw;
368
369 if (copy_from_user(&vw, user_arg, sizeof(vw))) {
370 retval = -EFAULT;
371 break;
372 }
373
374 DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
375
376 if ( vw.width != 320 || vw.height != 240 )
377 retval = -EFAULT;
378
379 break;
380 }
381
382 /* mmap interface */
383 case VIDIOCGMBUF:
384 {
385 struct video_mbuf vm;
386 int i;
387
388 DBG("VIDIOCGMBUF\n");
389 memset(&vm, 0, sizeof (vm));
390 vm.size =
391 VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
392 vm.frames = VICAM_FRAMES;
393 for (i = 0; i < VICAM_FRAMES; i++)
394 vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
395
396 if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
397 retval = -EFAULT;
398
399 break;
400 }
401
402 case VIDIOCMCAPTURE:
403 {
404 struct video_mmap vm;
405 // int video_size;
406
407 if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
408 retval = -EFAULT;
409 break;
410 }
411
412 DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
413
414 if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
415 retval = -EINVAL;
416
417 // in theory right here we'd start the image capturing
418 // (fill in a bulk urb and submit it asynchronously)
419 //
420 // Instead we're going to do a total hack job for now and
421 // retrieve the frame in VIDIOCSYNC
422
423 break;
424 }
425
426 case VIDIOCSYNC:
427 {
428 int frame;
429
430 if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
431 retval = -EFAULT;
432 break;
433 }
434 DBG("VIDIOCSYNC: %d\n", frame);
435
436 read_frame(cam, frame);
437 vicam_decode_color(cam->raw_image,
438 cam->framebuf +
439 frame * VICAM_MAX_FRAME_SIZE );
440
441 break;
442 }
443
444 /* pointless to implement overlay with this camera */
445 case VIDIOCCAPTURE:
446 case VIDIOCGFBUF:
447 case VIDIOCSFBUF:
448 case VIDIOCKEY:
449 retval = -EINVAL;
450 break;
451
452 /* tuner interface - we have none */
453 case VIDIOCGTUNER:
454 case VIDIOCSTUNER:
455 case VIDIOCGFREQ:
456 case VIDIOCSFREQ:
457 retval = -EINVAL;
458 break;
459
460 /* audio interface - we have none */
461 case VIDIOCGAUDIO:
462 case VIDIOCSAUDIO:
463 retval = -EINVAL;
464 break;
465 default:
466 retval = -ENOIOCTLCMD;
467 break;
468 }
469
470 return retval;
471 }
472
473 static int
474 vicam_open(struct file *file)
475 {
476 struct vicam_camera *cam = video_drvdata(file);
477
478 DBG("open\n");
479
480 if (!cam) {
481 printk(KERN_ERR
482 "vicam video_device improperly initialized");
483 return -EINVAL;
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 lock_kernel();
492 if (cam->open_count > 0) {
493 printk(KERN_INFO
494 "vicam_open called on already opened camera");
495 unlock_kernel();
496 return -EBUSY;
497 }
498
499 cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
500 if (!cam->raw_image) {
501 unlock_kernel();
502 return -ENOMEM;
503 }
504
505 cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
506 if (!cam->framebuf) {
507 kfree(cam->raw_image);
508 unlock_kernel();
509 return -ENOMEM;
510 }
511
512 cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
513 if (!cam->cntrlbuf) {
514 kfree(cam->raw_image);
515 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
516 unlock_kernel();
517 return -ENOMEM;
518 }
519
520 // First upload firmware, then turn the camera on
521
522 if (!cam->is_initialized) {
523 initialize_camera(cam);
524
525 cam->is_initialized = 1;
526 }
527
528 set_camera_power(cam, 1);
529
530 cam->needsDummyRead = 1;
531 cam->open_count++;
532
533 file->private_data = cam;
534 unlock_kernel();
535
536 return 0;
537 }
538
539 static int
540 vicam_close(struct file *file)
541 {
542 struct vicam_camera *cam = file->private_data;
543 int open_count;
544 struct usb_device *udev;
545
546 DBG("close\n");
547
548 /* it's not the end of the world if
549 * we fail to turn the camera off.
550 */
551
552 set_camera_power(cam, 0);
553
554 kfree(cam->raw_image);
555 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
556 kfree(cam->cntrlbuf);
557
558 mutex_lock(&cam->cam_lock);
559
560 cam->open_count--;
561 open_count = cam->open_count;
562 udev = cam->udev;
563
564 mutex_unlock(&cam->cam_lock);
565
566 if (!open_count && !udev) {
567 kfree(cam);
568 }
569
570 return 0;
571 }
572
573 static void vicam_decode_color(const u8 *data, u8 *rgb)
574 {
575 /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
576 * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
577 */
578
579 int i, prevY, nextY;
580
581 prevY = 512;
582 nextY = 512;
583
584 data += VICAM_HEADER_SIZE;
585
586 for( i = 0; i < 240; i++, data += 512 ) {
587 const int y = ( i * 242 ) / 240;
588
589 int j, prevX, nextX;
590 int Y, Cr, Cb;
591
592 if ( y == 242 - 1 ) {
593 nextY = -512;
594 }
595
596 prevX = 1;
597 nextX = 1;
598
599 for ( j = 0; j < 320; j++, rgb += 3 ) {
600 const int x = ( j * 512 ) / 320;
601 const u8 * const src = &data[x];
602
603 if ( x == 512 - 1 ) {
604 nextX = -1;
605 }
606
607 Cr = ( src[prevX] - src[0] ) +
608 ( src[nextX] - src[0] );
609 Cr /= 2;
610
611 Cb = ( src[prevY] - src[prevX + prevY] ) +
612 ( src[prevY] - src[nextX + prevY] ) +
613 ( src[nextY] - src[prevX + nextY] ) +
614 ( src[nextY] - src[nextX + nextY] );
615 Cb /= 4;
616
617 Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
618
619 if ( i & 1 ) {
620 int Ct = Cr;
621 Cr = Cb;
622 Cb = Ct;
623 }
624
625 if ( ( x ^ i ) & 1 ) {
626 Cr = -Cr;
627 Cb = -Cb;
628 }
629
630 rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
631 500 ) / 900, 0, 255 );
632 rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
633 ( 813 * Cr ) ) +
634 500 ) / 1000, 0, 255 );
635 rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
636 500 ) / 1300, 0, 255 );
637
638 prevX = -1;
639 }
640
641 prevY = -512;
642 }
643 }
644
645 static void
646 read_frame(struct vicam_camera *cam, int framenum)
647 {
648 unsigned char *request = cam->cntrlbuf;
649 int realShutter;
650 int n;
651 int actual_length;
652
653 if (cam->needsDummyRead) {
654 cam->needsDummyRead = 0;
655 read_frame(cam, framenum);
656 }
657
658 memset(request, 0, 16);
659 request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
660
661 request[1] = 0; // 512x242 capture
662
663 request[2] = 0x90; // the function of these two bytes
664 request[3] = 0x07; // is not yet understood
665
666 if (cam->shutter_speed > 60) {
667 // Short exposure
668 realShutter =
669 ((-15631900 / cam->shutter_speed) + 260533) / 1000;
670 request[4] = realShutter & 0xFF;
671 request[5] = (realShutter >> 8) & 0xFF;
672 request[6] = 0x03;
673 request[7] = 0x01;
674 } else {
675 // Long exposure
676 realShutter = 15600 / cam->shutter_speed - 1;
677 request[4] = 0;
678 request[5] = 0;
679 request[6] = realShutter & 0xFF;
680 request[7] = realShutter >> 8;
681 }
682
683 // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
684 request[8] = 0;
685 // bytes 9-15 do not seem to affect exposure or image quality
686
687 mutex_lock(&cam->cam_lock);
688
689 if (!cam->udev) {
690 goto done;
691 }
692
693 n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
694
695 if (n < 0) {
696 printk(KERN_ERR
697 " Problem sending frame capture control message");
698 goto done;
699 }
700
701 n = usb_bulk_msg(cam->udev,
702 usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
703 cam->raw_image,
704 512 * 242 + 128, &actual_length, 10000);
705
706 if (n < 0) {
707 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
708 n);
709 }
710
711 done:
712 mutex_unlock(&cam->cam_lock);
713 }
714
715 static ssize_t
716 vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
717 {
718 struct vicam_camera *cam = file->private_data;
719
720 DBG("read %d bytes.\n", (int) count);
721
722 if (*ppos >= VICAM_MAX_FRAME_SIZE) {
723 *ppos = 0;
724 return 0;
725 }
726
727 if (*ppos == 0) {
728 read_frame(cam, 0);
729 vicam_decode_color(cam->raw_image,
730 cam->framebuf +
731 0 * VICAM_MAX_FRAME_SIZE);
732 }
733
734 count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
735
736 if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
737 count = -EFAULT;
738 } else {
739 *ppos += count;
740 }
741
742 if (count == VICAM_MAX_FRAME_SIZE) {
743 *ppos = 0;
744 }
745
746 return count;
747 }
748
749
750 static int
751 vicam_mmap(struct file *file, struct vm_area_struct *vma)
752 {
753 // TODO: allocate the raw frame buffer if necessary
754 unsigned long page, pos;
755 unsigned long start = vma->vm_start;
756 unsigned long size = vma->vm_end-vma->vm_start;
757 struct vicam_camera *cam = file->private_data;
758
759 if (!cam)
760 return -ENODEV;
761
762 DBG("vicam_mmap: %ld\n", size);
763
764 /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
765 * to the size the application requested for mmap and it was screwing apps up.
766 if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
767 return -EINVAL;
768 */
769
770 pos = (unsigned long)cam->framebuf;
771 while (size > 0) {
772 page = vmalloc_to_pfn((void *)pos);
773 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
774 return -EAGAIN;
775
776 start += PAGE_SIZE;
777 pos += PAGE_SIZE;
778 if (size > PAGE_SIZE)
779 size -= PAGE_SIZE;
780 else
781 size = 0;
782 }
783
784 return 0;
785 }
786
787 static const struct v4l2_file_operations vicam_fops = {
788 .owner = THIS_MODULE,
789 .open = vicam_open,
790 .release = vicam_close,
791 .read = vicam_read,
792 .mmap = vicam_mmap,
793 .ioctl = vicam_ioctl,
794 };
795
796 static struct video_device vicam_template = {
797 .name = "ViCam-based USB Camera",
798 .fops = &vicam_fops,
799 .minor = -1,
800 .release = video_device_release_empty,
801 };
802
803 /* table of devices that work with this driver */
804 static struct usb_device_id vicam_table[] = {
805 {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
806 {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
807 {} /* Terminating entry */
808 };
809
810 MODULE_DEVICE_TABLE(usb, vicam_table);
811
812 static struct usb_driver vicam_driver = {
813 .name = "vicam",
814 .probe = vicam_probe,
815 .disconnect = vicam_disconnect,
816 .id_table = vicam_table
817 };
818
819 /**
820 * vicam_probe
821 * @intf: the interface
822 * @id: the device id
823 *
824 * Called by the usb core when a new device is connected that it thinks
825 * this driver might be interested in.
826 */
827 static int
828 vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
829 {
830 struct usb_device *dev = interface_to_usbdev(intf);
831 int bulkEndpoint = 0;
832 const struct usb_host_interface *interface;
833 const struct usb_endpoint_descriptor *endpoint;
834 struct vicam_camera *cam;
835
836 printk(KERN_INFO "ViCam based webcam connected\n");
837
838 interface = intf->cur_altsetting;
839
840 DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
841 interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
842 endpoint = &interface->endpoint[0].desc;
843
844 if (usb_endpoint_is_bulk_in(endpoint)) {
845 /* we found a bulk in endpoint */
846 bulkEndpoint = endpoint->bEndpointAddress;
847 } else {
848 printk(KERN_ERR
849 "No bulk in endpoint was found ?! (this is bad)\n");
850 }
851
852 if ((cam =
853 kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
854 printk(KERN_WARNING
855 "could not allocate kernel memory for vicam_camera struct\n");
856 return -ENOMEM;
857 }
858
859
860 cam->shutter_speed = 15;
861
862 mutex_init(&cam->cam_lock);
863
864 memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
865 video_set_drvdata(&cam->vdev, cam);
866
867 cam->udev = dev;
868 cam->bulkEndpoint = bulkEndpoint;
869
870 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
871 kfree(cam);
872 printk(KERN_WARNING "video_register_device failed\n");
873 return -EIO;
874 }
875
876 printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",
877 cam->vdev.num);
878
879 usb_set_intfdata (intf, cam);
880
881 return 0;
882 }
883
884 static void
885 vicam_disconnect(struct usb_interface *intf)
886 {
887 int open_count;
888 struct vicam_camera *cam = usb_get_intfdata (intf);
889 usb_set_intfdata (intf, NULL);
890
891 /* we must unregister the device before taking its
892 * cam_lock. This is because the video open call
893 * holds the same lock as video unregister. if we
894 * unregister inside of the cam_lock and open also
895 * uses the cam_lock, we get deadlock.
896 */
897
898 video_unregister_device(&cam->vdev);
899
900 /* stop the camera from being used */
901
902 mutex_lock(&cam->cam_lock);
903
904 /* mark the camera as gone */
905
906 cam->udev = NULL;
907
908 /* the only thing left to do is synchronize with
909 * our close/release function on who should release
910 * the camera memory. if there are any users using the
911 * camera, it's their job. if there are no users,
912 * it's ours.
913 */
914
915 open_count = cam->open_count;
916
917 mutex_unlock(&cam->cam_lock);
918
919 if (!open_count) {
920 kfree(cam);
921 }
922
923 printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
924 }
925
926 /*
927 */
928 static int __init
929 usb_vicam_init(void)
930 {
931 int retval;
932 DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
933 retval = usb_register(&vicam_driver);
934 if (retval)
935 printk(KERN_WARNING "usb_register failed!\n");
936 return retval;
937 }
938
939 static void __exit
940 usb_vicam_exit(void)
941 {
942 DBG(KERN_INFO
943 "ViCam-based WebCam driver shutdown\n");
944
945 usb_deregister(&vicam_driver);
946 }
947
948 module_init(usb_vicam_init);
949 module_exit(usb_vicam_exit);
950
951 MODULE_AUTHOR(DRIVER_AUTHOR);
952 MODULE_DESCRIPTION(DRIVER_DESC);
953 MODULE_LICENSE("GPL");
954 MODULE_FIRMWARE("vicam/firmware.fw");
955
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