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/mutex.h>
47 #include <linux/firmware.h>
48 #include <linux/ihex.h>
49 #include "usbvideo.h"
50
51 // #define VICAM_DEBUG
52
53 #ifdef VICAM_DEBUG
54 #define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
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
66 #define USB_COMPRO_VENDOR_ID 0x0602
67 #define USB_COMPRO_PRODUCT_ID 0x1001
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
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.
81 *
82 */
rvmalloc(unsigned long size)83 static 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
rvfree(void * mem,unsigned long size)104 static 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
120 struct 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 */
132 struct mutex cam_lock;
133
134 int is_initialized;
135 u8 open_count;
136 u8 bulkEndpoint;
137 int needsDummyRead;
138 };
139
140 static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
141 static void vicam_disconnect(struct usb_interface *intf);
142 static void read_frame(struct vicam_camera *cam, int framenum);
143 static void vicam_decode_color(const u8 *, u8 *);
144
__send_control_msg(struct vicam_camera * cam,u8 request,u16 value,u16 index,unsigned char * cp,u16 size)145 static 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
send_control_msg(struct vicam_camera * cam,u8 request,u16 value,u16 index,unsigned char * cp,u16 size)173 static 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;
181 mutex_lock(&cam->cam_lock);
182 if (cam->udev) {
183 status = __send_control_msg(cam, request, value,
184 index, cp, size);
185 }
186 mutex_unlock(&cam->cam_lock);
187 return status;
188 }
189 static int
initialize_camera(struct vicam_camera * cam)190 initialize_camera(struct vicam_camera *cam)
191 {
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));
205
206 err = send_control_msg(cam, 0xff, 0, 0,
207 cam->cntrlbuf, be16_to_cpu(rec->len));
208 if (err)
209 break;
210 }
211
212 release_firmware(fw);
213
214 return err;
215 }
216
217 static int
set_camera_power(struct vicam_camera * cam,int state)218 set_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
232 static long
vicam_ioctl(struct file * file,unsigned int ioctlnr,unsigned long arg)233 vicam_ioctl(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 long 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;
322
323 if (copy_from_user(&vp, user_arg, sizeof(vp))) {
324 retval = -EFAULT;
325 break;
326 }
327
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);
374
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
472 static int
vicam_open(struct file * file)473 vicam_open(struct file *file)
474 {
475 struct vicam_camera *cam = video_drvdata(file);
476
477 DBG("open\n");
478
479 if (!cam) {
480 printk(KERN_ERR
481 "vicam video_device improperly initialized");
482 return -EINVAL;
483 }
484
485 /* the videodev_lock held above us protects us from
486 * simultaneous opens...for now. we probably shouldn't
487 * rely on this fact forever.
488 */
489
490 lock_kernel();
491 if (cam->open_count > 0) {
492 printk(KERN_INFO
493 "vicam_open called on already opened camera");
494 unlock_kernel();
495 return -EBUSY;
496 }
497
498 cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
499 if (!cam->raw_image) {
500 unlock_kernel();
501 return -ENOMEM;
502 }
503
504 cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
505 if (!cam->framebuf) {
506 kfree(cam->raw_image);
507 unlock_kernel();
508 return -ENOMEM;
509 }
510
511 cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
512 if (!cam->cntrlbuf) {
513 kfree(cam->raw_image);
514 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
515 unlock_kernel();
516 return -ENOMEM;
517 }
518
519 // First upload firmware, then turn the camera on
520
521 if (!cam->is_initialized) {
522 initialize_camera(cam);
523
524 cam->is_initialized = 1;
525 }
526
527 set_camera_power(cam, 1);
528
529 cam->needsDummyRead = 1;
530 cam->open_count++;
531
532 file->private_data = cam;
533 unlock_kernel();
534
535 return 0;
536 }
537
538 static int
vicam_close(struct file * file)539 vicam_close(struct file *file)
540 {
541 struct vicam_camera *cam = file->private_data;
542 int open_count;
543 struct usb_device *udev;
544
545 DBG("close\n");
546
547 /* it's not the end of the world if
548 * we fail to turn the camera off.
549 */
550
551 set_camera_power(cam, 0);
552
553 kfree(cam->raw_image);
554 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
555 kfree(cam->cntrlbuf);
556
557 mutex_lock(&cam->cam_lock);
558
559 cam->open_count--;
560 open_count = cam->open_count;
561 udev = cam->udev;
562
563 mutex_unlock(&cam->cam_lock);
564
565 if (!open_count && !udev) {
566 kfree(cam);
567 }
568
569 return 0;
570 }
571
vicam_decode_color(const u8 * data,u8 * rgb)572 static void vicam_decode_color(const u8 *data, u8 *rgb)
573 {
574 /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
575 * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
576 */
577
578 int i, prevY, nextY;
579
580 prevY = 512;
581 nextY = 512;
582
583 data += VICAM_HEADER_SIZE;
584
585 for( i = 0; i < 240; i++, data += 512 ) {
586 const int y = ( i * 242 ) / 240;
587
588 int j, prevX, nextX;
589 int Y, Cr, Cb;
590
591 if ( y == 242 - 1 ) {
592 nextY = -512;
593 }
594
595 prevX = 1;
596 nextX = 1;
597
598 for ( j = 0; j < 320; j++, rgb += 3 ) {
599 const int x = ( j * 512 ) / 320;
600 const u8 * const src = &data[x];
601
602 if ( x == 512 - 1 ) {
603 nextX = -1;
604 }
605
606 Cr = ( src[prevX] - src[0] ) +
607 ( src[nextX] - src[0] );
608 Cr /= 2;
609
610 Cb = ( src[prevY] - src[prevX + prevY] ) +
611 ( src[prevY] - src[nextX + prevY] ) +
612 ( src[nextY] - src[prevX + nextY] ) +
613 ( src[nextY] - src[nextX + nextY] );
614 Cb /= 4;
615
616 Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
617
618 if ( i & 1 ) {
619 int Ct = Cr;
620 Cr = Cb;
621 Cb = Ct;
622 }
623
624 if ( ( x ^ i ) & 1 ) {
625 Cr = -Cr;
626 Cb = -Cb;
627 }
628
629 rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
630 500 ) / 900, 0, 255 );
631 rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
632 ( 813 * Cr ) ) +
633 500 ) / 1000, 0, 255 );
634 rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
635 500 ) / 1300, 0, 255 );
636
637 prevX = -1;
638 }
639
640 prevY = -512;
641 }
642 }
643
644 static void
read_frame(struct vicam_camera * cam,int framenum)645 read_frame(struct vicam_camera *cam, int framenum)
646 {
647 unsigned char *request = cam->cntrlbuf;
648 int realShutter;
649 int n;
650 int actual_length;
651
652 if (cam->needsDummyRead) {
653 cam->needsDummyRead = 0;
654 read_frame(cam, framenum);
655 }
656
657 memset(request, 0, 16);
658 request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
659
660 request[1] = 0; // 512x242 capture
661
662 request[2] = 0x90; // the function of these two bytes
663 request[3] = 0x07; // is not yet understood
664
665 if (cam->shutter_speed > 60) {
666 // Short exposure
667 realShutter =
668 ((-15631900 / cam->shutter_speed) + 260533) / 1000;
669 request[4] = realShutter & 0xFF;
670 request[5] = (realShutter >> 8) & 0xFF;
671 request[6] = 0x03;
672 request[7] = 0x01;
673 } else {
674 // Long exposure
675 realShutter = 15600 / cam->shutter_speed - 1;
676 request[4] = 0;
677 request[5] = 0;
678 request[6] = realShutter & 0xFF;
679 request[7] = realShutter >> 8;
680 }
681
682 // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
683 request[8] = 0;
684 // bytes 9-15 do not seem to affect exposure or image quality
685
686 mutex_lock(&cam->cam_lock);
687
688 if (!cam->udev) {
689 goto done;
690 }
691
692 n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
693
694 if (n < 0) {
695 printk(KERN_ERR
696 " Problem sending frame capture control message");
697 goto done;
698 }
699
700 n = usb_bulk_msg(cam->udev,
701 usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
702 cam->raw_image,
703 512 * 242 + 128, &actual_length, 10000);
704
705 if (n < 0) {
706 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
707 n);
708 }
709
710 done:
711 mutex_unlock(&cam->cam_lock);
712 }
713
714 static ssize_t
vicam_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)715 vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
716 {
717 struct vicam_camera *cam = file->private_data;
718
719 DBG("read %d bytes.\n", (int) count);
720
721 if (*ppos >= VICAM_MAX_FRAME_SIZE) {
722 *ppos = 0;
723 return 0;
724 }
725
726 if (*ppos == 0) {
727 read_frame(cam, 0);
728 vicam_decode_color(cam->raw_image,
729 cam->framebuf +
730 0 * VICAM_MAX_FRAME_SIZE);
731 }
732
733 count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
734
735 if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
736 count = -EFAULT;
737 } else {
738 *ppos += count;
739 }
740
741 if (count == VICAM_MAX_FRAME_SIZE) {
742 *ppos = 0;
743 }
744
745 return count;
746 }
747
748
749 static int
vicam_mmap(struct file * file,struct vm_area_struct * vma)750 vicam_mmap(struct file *file, struct vm_area_struct *vma)
751 {
752 // TODO: allocate the raw frame buffer if necessary
753 unsigned long page, pos;
754 unsigned long start = vma->vm_start;
755 unsigned long size = vma->vm_end-vma->vm_start;
756 struct vicam_camera *cam = file->private_data;
757
758 if (!cam)
759 return -ENODEV;
760
761 DBG("vicam_mmap: %ld\n", size);
762
763 /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
764 * to the size the application requested for mmap and it was screwing apps up.
765 if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
766 return -EINVAL;
767 */
768
769 pos = (unsigned long)cam->framebuf;
770 while (size > 0) {
771 page = vmalloc_to_pfn((void *)pos);
772 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
773 return -EAGAIN;
774
775 start += PAGE_SIZE;
776 pos += PAGE_SIZE;
777 if (size > PAGE_SIZE)
778 size -= PAGE_SIZE;
779 else
780 size = 0;
781 }
782
783 return 0;
784 }
785
786 static const struct v4l2_file_operations vicam_fops = {
787 .owner = THIS_MODULE,
788 .open = vicam_open,
789 .release = vicam_close,
790 .read = vicam_read,
791 .mmap = vicam_mmap,
792 .ioctl = vicam_ioctl,
793 };
794
795 static struct video_device vicam_template = {
796 .name = "ViCam-based USB Camera",
797 .fops = &vicam_fops,
798 .minor = -1,
799 .release = video_device_release_empty,
800 };
801
802 /* table of devices that work with this driver */
803 static struct usb_device_id vicam_table[] = {
804 {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
805 {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
806 {} /* Terminating entry */
807 };
808
809 MODULE_DEVICE_TABLE(usb, vicam_table);
810
811 static struct usb_driver vicam_driver = {
812 .name = "vicam",
813 .probe = vicam_probe,
814 .disconnect = vicam_disconnect,
815 .id_table = vicam_table
816 };
817
818 /**
819 * vicam_probe
820 * @intf: the interface
821 * @id: the device id
822 *
823 * Called by the usb core when a new device is connected that it thinks
824 * this driver might be interested in.
825 */
826 static int
vicam_probe(struct usb_interface * intf,const struct usb_device_id * id)827 vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
828 {
829 struct usb_device *dev = interface_to_usbdev(intf);
830 int bulkEndpoint = 0;
831 const struct usb_host_interface *interface;
832 const struct usb_endpoint_descriptor *endpoint;
833 struct vicam_camera *cam;
834
835 printk(KERN_INFO "ViCam based webcam connected\n");
836
837 interface = intf->cur_altsetting;
838
839 DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
840 interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
841 endpoint = &interface->endpoint[0].desc;
842
843 if (usb_endpoint_is_bulk_in(endpoint)) {
844 /* we found a bulk in endpoint */
845 bulkEndpoint = endpoint->bEndpointAddress;
846 } else {
847 printk(KERN_ERR
848 "No bulk in endpoint was found ?! (this is bad)\n");
849 }
850
851 if ((cam =
852 kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
853 printk(KERN_WARNING
854 "could not allocate kernel memory for vicam_camera struct\n");
855 return -ENOMEM;
856 }
857
858
859 cam->shutter_speed = 15;
860
861 mutex_init(&cam->cam_lock);
862
863 memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
864 video_set_drvdata(&cam->vdev, cam);
865
866 cam->udev = dev;
867 cam->bulkEndpoint = bulkEndpoint;
868
869 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
870 kfree(cam);
871 printk(KERN_WARNING "video_register_device failed\n");
872 return -EIO;
873 }
874
875 printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",
876 cam->vdev.num);
877
878 usb_set_intfdata (intf, cam);
879
880 return 0;
881 }
882
883 static void
vicam_disconnect(struct usb_interface * intf)884 vicam_disconnect(struct usb_interface *intf)
885 {
886 int open_count;
887 struct vicam_camera *cam = usb_get_intfdata (intf);
888 usb_set_intfdata (intf, NULL);
889
890 /* we must unregister the device before taking its
891 * cam_lock. This is because the video open call
892 * holds the same lock as video unregister. if we
893 * unregister inside of the cam_lock and open also
894 * uses the cam_lock, we get deadlock.
895 */
896
897 video_unregister_device(&cam->vdev);
898
899 /* stop the camera from being used */
900
901 mutex_lock(&cam->cam_lock);
902
903 /* mark the camera as gone */
904
905 cam->udev = NULL;
906
907 /* the only thing left to do is synchronize with
908 * our close/release function on who should release
909 * the camera memory. if there are any users using the
910 * camera, it's their job. if there are no users,
911 * it's ours.
912 */
913
914 open_count = cam->open_count;
915
916 mutex_unlock(&cam->cam_lock);
917
918 if (!open_count) {
919 kfree(cam);
920 }
921
922 printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
923 }
924
925 /*
926 */
927 static int __init
usb_vicam_init(void)928 usb_vicam_init(void)
929 {
930 int retval;
931 DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
932 retval = usb_register(&vicam_driver);
933 if (retval)
934 printk(KERN_WARNING "usb_register failed!\n");
935 return retval;
936 }
937
938 static void __exit
usb_vicam_exit(void)939 usb_vicam_exit(void)
940 {
941 DBG(KERN_INFO
942 "ViCam-based WebCam driver shutdown\n");
943
944 usb_deregister(&vicam_driver);
945 }
946
947 module_init(usb_vicam_init);
948 module_exit(usb_vicam_exit);
949
950 MODULE_AUTHOR(DRIVER_AUTHOR);
951 MODULE_DESCRIPTION(DRIVER_DESC);
952 MODULE_LICENSE("GPL");
953 MODULE_FIRMWARE("vicam/firmware.fw");
954