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V4L/DVB (8488a): Add myself as a maintainer of the soc-camera subsystem
[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>
44#include <linux/slab.h>
4186ecf8 45#include <linux/mutex.h>
fb54be87
JS		 46#include <linux/firmware.h>
47#include <linux/ihex.h>
1da177e4
LT		 48#include "usbvideo.h"
49
50// #define VICAM_DEBUG
51
52#ifdef VICAM_DEBUG
4126a8f5 53#define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
1da177e4
LT		 54#define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
55#else
56#define DBG(fmn,args...) do {} while(0)
57#endif
58
59#define DRIVER_AUTHOR "Joe Burks, jburks@wavicle.org"
60#define DRIVER_DESC "ViCam WebCam Driver"
61
62/* Define these values to match your device */
63#define USB_VICAM_VENDOR_ID 0x04c1
64#define USB_VICAM_PRODUCT_ID 0x009d
81409ed0
BB		 65#define USB_COMPRO_VENDOR_ID 0x0602
66#define USB_COMPRO_PRODUCT_ID 0x1001
1da177e4
LT		 67
68#define VICAM_BYTES_PER_PIXEL 3
69#define VICAM_MAX_READ_SIZE (512*242+128)
70#define VICAM_MAX_FRAME_SIZE (VICAM_BYTES_PER_PIXEL*320*240)
71#define VICAM_FRAMES 2
72
73#define VICAM_HEADER_SIZE 64
74
1da177e4
LT		 75/* rvmalloc / rvfree copied from usbvideo.c
76 *
77 * Not sure why these are not yet non-statics which I can reference through
78 * usbvideo.h the same as it is in 2.4.20. I bet this will get fixed sometime
79 * in the future.
d56410e0 80 *
1da177e4
LT		 81*/
82static void *rvmalloc(unsigned long size)
83{
84 void *mem;
85 unsigned long adr;
86
87 size = PAGE_ALIGN(size);
88 mem = vmalloc_32(size);
89 if (!mem)
90 return NULL;
91
92 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
93 adr = (unsigned long) mem;
94 while (size > 0) {
95 SetPageReserved(vmalloc_to_page((void *)adr));
96 adr += PAGE_SIZE;
97 size -= PAGE_SIZE;
98 }
99
100 return mem;
101}
102
103static void rvfree(void *mem, unsigned long size)
104{
105 unsigned long adr;
106
107 if (!mem)
108 return;
109
110 adr = (unsigned long) mem;
111 while ((long) size > 0) {
112 ClearPageReserved(vmalloc_to_page((void *)adr));
113 adr += PAGE_SIZE;
114 size -= PAGE_SIZE;
115 }
116 vfree(mem);
117}
118
119struct vicam_camera {
120 u16 shutter_speed; // capture shutter speed
121 u16 gain; // capture gain
122
123 u8 *raw_image; // raw data captured from the camera
124 u8 *framebuf; // processed data in RGB24 format
125 u8 *cntrlbuf; // area used to send control msgs
126
127 struct video_device vdev; // v4l video device
128 struct usb_device *udev; // usb device
129
130 /* guard against simultaneous accesses to the camera */
4186ecf8 131 struct mutex cam_lock;
1da177e4
LT		 132
133 int is_initialized;
134 u8 open_count;
135 u8 bulkEndpoint;
136 int needsDummyRead;
1da177e4
LT		 137};
138
139static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
140static void vicam_disconnect(struct usb_interface *intf);
141static void read_frame(struct vicam_camera *cam, int framenum);
142static void vicam_decode_color(const u8 *, u8 *);
143
144static int __send_control_msg(struct vicam_camera *cam,
145 u8 request,
146 u16 value,
147 u16 index,
148 unsigned char *cp,
149 u16 size)
150{
151 int status;
152
153 /* cp must be memory that has been allocated by kmalloc */
154
155 status = usb_control_msg(cam->udev,
156 usb_sndctrlpipe(cam->udev, 0),
157 request,
158 USB_DIR_OUT | USB_TYPE_VENDOR |
159 USB_RECIP_DEVICE, value, index,
160 cp, size, 1000);
161
162 status = min(status, 0);
163
164 if (status < 0) {
165 printk(KERN_INFO "Failed sending control message, error %d.\n",
166 status);
167 }
168
169 return status;
170}
171
172static int send_control_msg(struct vicam_camera *cam,
173 u8 request,
174 u16 value,
175 u16 index,
176 unsigned char *cp,
177 u16 size)
178{
179 int status = -ENODEV;
4186ecf8 180 mutex_lock(&cam->cam_lock);
1da177e4
LT		 181 if (cam->udev) {
182 status = __send_control_msg(cam, request, value,
183 index, cp, size);
184 }
4186ecf8 185 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 186 return status;
187}
188static int
189initialize_camera(struct vicam_camera *cam)
190{
fb54be87
JS		 191 int err;
192 const struct ihex_binrec *rec;
193 const struct firmware *fw;
194
195 err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
196 if (err) {
197 printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
198 err);
199 return err;
200 }
201
202 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
203 memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
1da177e4
LT		 204
205 err = send_control_msg(cam, 0xff, 0, 0,
fb54be87
JS		 206 cam->cntrlbuf, be16_to_cpu(rec->len));
207 if (err)
208 break;
1da177e4
LT		 209 }
210
fb54be87
JS		 211 release_firmware(fw);
212
1da177e4
LT		 213 return err;
214}
215
216static int
217set_camera_power(struct vicam_camera *cam, int state)
218{
219 int status;
220
221 if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
222 return status;
223
224 if (state) {
225 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
226 }
227
228 return 0;
229}
230
231static int
232vicam_ioctl(struct inode *inode, struct file *file, unsigned int ioctlnr, unsigned long arg)
233{
234 void __user *user_arg = (void __user *)arg;
235 struct vicam_camera *cam = file->private_data;
236 int retval = 0;
237
238 if (!cam)
239 return -ENODEV;
240
241 switch (ioctlnr) {
242 /* query capabilities */
243 case VIDIOCGCAP:
244 {
245 struct video_capability b;
246
247 DBG("VIDIOCGCAP\n");
248 memset(&b, 0, sizeof(b));
249 strcpy(b.name, "ViCam-based Camera");
250 b.type = VID_TYPE_CAPTURE;
251 b.channels = 1;
252 b.audios = 0;
253 b.maxwidth = 320; /* VIDEOSIZE_CIF */
254 b.maxheight = 240;
255 b.minwidth = 320; /* VIDEOSIZE_48_48 */
256 b.minheight = 240;
257
258 if (copy_to_user(user_arg, &b, sizeof(b)))
259 retval = -EFAULT;
260
261 break;
262 }
263 /* get/set video source - we are a camera and nothing else */
264 case VIDIOCGCHAN:
265 {
266 struct video_channel v;
267
268 DBG("VIDIOCGCHAN\n");
269 if (copy_from_user(&v, user_arg, sizeof(v))) {
270 retval = -EFAULT;
271 break;
272 }
273 if (v.channel != 0) {
274 retval = -EINVAL;
275 break;
276 }
277
278 v.channel = 0;
279 strcpy(v.name, "Camera");
280 v.tuners = 0;
281 v.flags = 0;
282 v.type = VIDEO_TYPE_CAMERA;
283 v.norm = 0;
284
285 if (copy_to_user(user_arg, &v, sizeof(v)))
286 retval = -EFAULT;
287 break;
288 }
289
290 case VIDIOCSCHAN:
291 {
292 int v;
293
294 if (copy_from_user(&v, user_arg, sizeof(v)))
295 retval = -EFAULT;
296 DBG("VIDIOCSCHAN %d\n", v);
297
298 if (retval == 0 && v != 0)
299 retval = -EINVAL;
300
301 break;
302 }
303
304 /* image properties */
305 case VIDIOCGPICT:
306 {
307 struct video_picture vp;
308 DBG("VIDIOCGPICT\n");
309 memset(&vp, 0, sizeof (struct video_picture));
310 vp.brightness = cam->gain << 8;
311 vp.depth = 24;
312 vp.palette = VIDEO_PALETTE_RGB24;
313 if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
314 retval = -EFAULT;
315 break;
316 }
317
318 case VIDIOCSPICT:
319 {
320 struct video_picture vp;
d56410e0 321
1da177e4
LT		 322 if (copy_from_user(&vp, user_arg, sizeof(vp))) {
323 retval = -EFAULT;
324 break;
325 }
d56410e0 326
1da177e4
LT		 327 DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
328 vp.palette);
329
330 cam->gain = vp.brightness >> 8;
331
332 if (vp.depth != 24
333 || vp.palette != VIDEO_PALETTE_RGB24)
334 retval = -EINVAL;
335
336 break;
337 }
338
339 /* get/set capture window */
340 case VIDIOCGWIN:
341 {
342 struct video_window vw;
343 vw.x = 0;
344 vw.y = 0;
345 vw.width = 320;
346 vw.height = 240;
347 vw.chromakey = 0;
348 vw.flags = 0;
349 vw.clips = NULL;
350 vw.clipcount = 0;
351
352 DBG("VIDIOCGWIN\n");
353
354 if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
355 retval = -EFAULT;
356
357 // I'm not sure what the deal with a capture window is, it is very poorly described
358 // in the doc. So I won't support it now.
359 break;
360 }
361
362 case VIDIOCSWIN:
363 {
364
365 struct video_window vw;
366
367 if (copy_from_user(&vw, user_arg, sizeof(vw))) {
368 retval = -EFAULT;
369 break;
370 }
371
372 DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
d56410e0 373
1da177e4
LT		 374 if ( vw.width != 320 || vw.height != 240 )
375 retval = -EFAULT;
376
377 break;
378 }
379
380 /* mmap interface */
381 case VIDIOCGMBUF:
382 {
383 struct video_mbuf vm;
384 int i;
385
386 DBG("VIDIOCGMBUF\n");
387 memset(&vm, 0, sizeof (vm));
388 vm.size =
389 VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
390 vm.frames = VICAM_FRAMES;
391 for (i = 0; i < VICAM_FRAMES; i++)
392 vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
393
394 if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
395 retval = -EFAULT;
396
397 break;
398 }
399
400 case VIDIOCMCAPTURE:
401 {
402 struct video_mmap vm;
403 // int video_size;
404
405 if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
406 retval = -EFAULT;
407 break;
408 }
409
410 DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
411
412 if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
413 retval = -EINVAL;
414
415 // in theory right here we'd start the image capturing
416 // (fill in a bulk urb and submit it asynchronously)
417 //
418 // Instead we're going to do a total hack job for now and
419 // retrieve the frame in VIDIOCSYNC
420
421 break;
422 }
423
424 case VIDIOCSYNC:
425 {
426 int frame;
427
428 if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
429 retval = -EFAULT;
430 break;
431 }
432 DBG("VIDIOCSYNC: %d\n", frame);
433
434 read_frame(cam, frame);
435 vicam_decode_color(cam->raw_image,
436 cam->framebuf +
437 frame * VICAM_MAX_FRAME_SIZE );
438
439 break;
440 }
441
442 /* pointless to implement overlay with this camera */
443 case VIDIOCCAPTURE:
444 case VIDIOCGFBUF:
445 case VIDIOCSFBUF:
446 case VIDIOCKEY:
447 retval = -EINVAL;
448 break;
449
450 /* tuner interface - we have none */
451 case VIDIOCGTUNER:
452 case VIDIOCSTUNER:
453 case VIDIOCGFREQ:
454 case VIDIOCSFREQ:
455 retval = -EINVAL;
456 break;
457
458 /* audio interface - we have none */
459 case VIDIOCGAUDIO:
460 case VIDIOCSAUDIO:
461 retval = -EINVAL;
462 break;
463 default:
464 retval = -ENOIOCTLCMD;
465 break;
466 }
467
468 return retval;
469}
470
471static int
472vicam_open(struct inode *inode, struct file *file)
473{
474 struct video_device *dev = video_devdata(file);
475 struct vicam_camera *cam =
476 (struct vicam_camera *) dev->priv;
477 DBG("open\n");
478
479 if (!cam) {
480 printk(KERN_ERR
481 "vicam video_device improperly initialized");
f88f8295 482 return -EINVAL;
1da177e4
LT		 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 if (cam->open_count > 0) {
491 printk(KERN_INFO
492 "vicam_open called on already opened camera");
493 return -EBUSY;
494 }
495
496 cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
497 if (!cam->raw_image) {
498 return -ENOMEM;
499 }
500
501 cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
502 if (!cam->framebuf) {
503 kfree(cam->raw_image);
504 return -ENOMEM;
505 }
506
507 cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
508 if (!cam->cntrlbuf) {
509 kfree(cam->raw_image);
510 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
511 return -ENOMEM;
512 }
513
514 // First upload firmware, then turn the camera on
515
516 if (!cam->is_initialized) {
517 initialize_camera(cam);
518
519 cam->is_initialized = 1;
520 }
521
522 set_camera_power(cam, 1);
523
524 cam->needsDummyRead = 1;
525 cam->open_count++;
526
d56410e0
MCC		 527 file->private_data = cam;
528
1da177e4
LT		 529 return 0;
530}
531
d56410e0 532static int
1da177e4
LT		 533vicam_close(struct inode *inode, struct file *file)
534{
535 struct vicam_camera *cam = file->private_data;
536 int open_count;
537 struct usb_device *udev;
538
539 DBG("close\n");
540
541 /* it's not the end of the world if
542 * we fail to turn the camera off.
543 */
544
545 set_camera_power(cam, 0);
546
547 kfree(cam->raw_image);
548 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
549 kfree(cam->cntrlbuf);
550
4186ecf8 551 mutex_lock(&cam->cam_lock);
1da177e4
LT		 552
553 cam->open_count--;
554 open_count = cam->open_count;
555 udev = cam->udev;
556
4186ecf8 557 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 558
559 if (!open_count && !udev) {
560 kfree(cam);
561 }
562
563 return 0;
564}
565
566static void vicam_decode_color(const u8 *data, u8 *rgb)
567{
568 /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
569 * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
570 */
571
572 int i, prevY, nextY;
573
574 prevY = 512;
575 nextY = 512;
576
577 data += VICAM_HEADER_SIZE;
578
579 for( i = 0; i < 240; i++, data += 512 ) {
580 const int y = ( i * 242 ) / 240;
581
582 int j, prevX, nextX;
583 int Y, Cr, Cb;
584
585 if ( y == 242 - 1 ) {
586 nextY = -512;
587 }
588
589 prevX = 1;
590 nextX = 1;
591
592 for ( j = 0; j < 320; j++, rgb += 3 ) {
593 const int x = ( j * 512 ) / 320;
594 const u8 * const src = &data[x];
595
596 if ( x == 512 - 1 ) {
597 nextX = -1;
598 }
599
600 Cr = ( src[prevX] - src[0] ) +
601 ( src[nextX] - src[0] );
602 Cr /= 2;
603
604 Cb = ( src[prevY] - src[prevX + prevY] ) +
605 ( src[prevY] - src[nextX + prevY] ) +
606 ( src[nextY] - src[prevX + nextY] ) +
607 ( src[nextY] - src[nextX + nextY] );
608 Cb /= 4;
609
610 Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
611
612 if ( i & 1 ) {
613 int Ct = Cr;
614 Cr = Cb;
615 Cb = Ct;
616 }
617
618 if ( ( x ^ i ) & 1 ) {
619 Cr = -Cr;
620 Cb = -Cb;
621 }
622
623 rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
624 500 ) / 900, 0, 255 );
625 rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
626 ( 813 * Cr ) ) +
627 500 ) / 1000, 0, 255 );
628 rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
629 500 ) / 1300, 0, 255 );
630
631 prevX = -1;
632 }
633
634 prevY = -512;
635 }
636}
637
638static void
639read_frame(struct vicam_camera *cam, int framenum)
640{
641 unsigned char *request = cam->cntrlbuf;
642 int realShutter;
643 int n;
644 int actual_length;
645
646 if (cam->needsDummyRead) {
647 cam->needsDummyRead = 0;
648 read_frame(cam, framenum);
649 }
650
651 memset(request, 0, 16);
652 request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
653
654 request[1] = 0; // 512x242 capture
655
656 request[2] = 0x90; // the function of these two bytes
657 request[3] = 0x07; // is not yet understood
658
659 if (cam->shutter_speed > 60) {
660 // Short exposure
661 realShutter =
662 ((-15631900 / cam->shutter_speed) + 260533) / 1000;
663 request[4] = realShutter & 0xFF;
664 request[5] = (realShutter >> 8) & 0xFF;
665 request[6] = 0x03;
666 request[7] = 0x01;
667 } else {
668 // Long exposure
669 realShutter = 15600 / cam->shutter_speed - 1;
670 request[4] = 0;
671 request[5] = 0;
672 request[6] = realShutter & 0xFF;
673 request[7] = realShutter >> 8;
674 }
675
96de0e25 676 // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
1da177e4
LT		 677 request[8] = 0;
678 // bytes 9-15 do not seem to affect exposure or image quality
679
4186ecf8 680 mutex_lock(&cam->cam_lock);
1da177e4
LT		 681
682 if (!cam->udev) {
683 goto done;
684 }
685
686 n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
687
688 if (n < 0) {
689 printk(KERN_ERR
690 " Problem sending frame capture control message");
691 goto done;
692 }
693
694 n = usb_bulk_msg(cam->udev,
695 usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
696 cam->raw_image,
697 512 * 242 + 128, &actual_length, 10000);
698
699 if (n < 0) {
700 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
701 n);
702 }
703
704 done:
4186ecf8 705 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 706}
707
708static ssize_t
709vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
710{
711 struct vicam_camera *cam = file->private_data;
712
713 DBG("read %d bytes.\n", (int) count);
714
715 if (*ppos >= VICAM_MAX_FRAME_SIZE) {
716 *ppos = 0;
717 return 0;
718 }
719
720 if (*ppos == 0) {
721 read_frame(cam, 0);
722 vicam_decode_color(cam->raw_image,
723 cam->framebuf +
724 0 * VICAM_MAX_FRAME_SIZE);
725 }
726
727 count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
728
729 if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
730 count = -EFAULT;
731 } else {
732 *ppos += count;
733 }
734
735 if (count == VICAM_MAX_FRAME_SIZE) {
736 *ppos = 0;
737 }
738
739 return count;
740}
741
742
743static int
744vicam_mmap(struct file *file, struct vm_area_struct *vma)
745{
746 // TODO: allocate the raw frame buffer if necessary
747 unsigned long page, pos;
748 unsigned long start = vma->vm_start;
749 unsigned long size = vma->vm_end-vma->vm_start;
750 struct vicam_camera *cam = file->private_data;
751
752 if (!cam)
753 return -ENODEV;
754
755 DBG("vicam_mmap: %ld\n", size);
756
757 /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
758 * to the size the application requested for mmap and it was screwing apps up.
759 if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
760 return -EINVAL;
761 */
762
763 pos = (unsigned long)cam->framebuf;
764 while (size > 0) {
765 page = vmalloc_to_pfn((void *)pos);
766 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
767 return -EAGAIN;
768
769 start += PAGE_SIZE;
770 pos += PAGE_SIZE;
771 if (size > PAGE_SIZE)
772 size -= PAGE_SIZE;
773 else
774 size = 0;
775 }
776
777 return 0;
778}
779
fa027c2a 780static const struct file_operations vicam_fops = {
1da177e4
LT		 781 .owner = THIS_MODULE,
782 .open = vicam_open,
783 .release = vicam_close,
784 .read = vicam_read,
785 .mmap = vicam_mmap,
786 .ioctl = vicam_ioctl,
078ff795 787#ifdef CONFIG_COMPAT
0d0fbf81 788 .compat_ioctl = v4l_compat_ioctl32,
078ff795 789#endif
1da177e4
LT		 790 .llseek = no_llseek,
791};
792
793static struct video_device vicam_template = {
1da177e4
LT		 794 .name = "ViCam-based USB Camera",
795 .type = VID_TYPE_CAPTURE,
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
869 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) == -1) {
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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