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V4L/DVB (8787): v4l2-dev: cleanups and add video_drvdata helper function
[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);
601e9444
HV		 476 struct vicam_camera *cam = video_get_drvdata(dev);
477
1da177e4
LT		 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
d56dc612 491 lock_kernel();
1da177e4
LT		 492 if (cam->open_count > 0) {
493 printk(KERN_INFO
494 "vicam_open called on already opened camera");
d56dc612 495 unlock_kernel();
1da177e4
LT		 496 return -EBUSY;
497 }
498
499 cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
500 if (!cam->raw_image) {
d56dc612 501 unlock_kernel();
1da177e4
LT		 502 return -ENOMEM;
503 }
504
505 cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
506 if (!cam->framebuf) {
507 kfree(cam->raw_image);
d56dc612 508 unlock_kernel();
1da177e4
LT		 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);
d56dc612 516 unlock_kernel();
1da177e4
LT		 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
d56410e0 533 file->private_data = cam;
d56dc612 534 unlock_kernel();
d56410e0 535
1da177e4
LT		 536 return 0;
537}
538
d56410e0 539static int
1da177e4
LT		 540vicam_close(struct inode *inode, 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
4186ecf8 558 mutex_lock(&cam->cam_lock);
1da177e4
LT		 559
560 cam->open_count--;
561 open_count = cam->open_count;
562 udev = cam->udev;
563
4186ecf8 564 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 565
566 if (!open_count && !udev) {
567 kfree(cam);
568 }
569
570 return 0;
571}
572
573static 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
645static void
646read_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
96de0e25 683 // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
1da177e4
LT		 684 request[8] = 0;
685 // bytes 9-15 do not seem to affect exposure or image quality
686
4186ecf8 687 mutex_lock(&cam->cam_lock);
1da177e4
LT		 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:
4186ecf8 712 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 713}
714
715static ssize_t
716vicam_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
750static int
751vicam_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
fa027c2a 787static const struct file_operations vicam_fops = {
1da177e4
LT		 788 .owner = THIS_MODULE,
789 .open = vicam_open,
790 .release = vicam_close,
791 .read = vicam_read,
792 .mmap = vicam_mmap,
793 .ioctl = vicam_ioctl,
078ff795 794#ifdef CONFIG_COMPAT
0d0fbf81 795 .compat_ioctl = v4l_compat_ioctl32,
078ff795 796#endif
1da177e4
LT		 797 .llseek = no_llseek,
798};
799
800static struct video_device vicam_template = {
1da177e4 801 .name = "ViCam-based USB Camera",
1da177e4
LT		 802 .fops = &vicam_fops,
803 .minor = -1,
aa5e90af 804 .release = video_device_release_empty,
1da177e4
LT		 805};
806
807/* table of devices that work with this driver */
808static struct usb_device_id vicam_table[] = {
809 {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
81409ed0 810 {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
1da177e4
LT		 811 {} /* Terminating entry */
812};
813
814MODULE_DEVICE_TABLE(usb, vicam_table);
815
816static struct usb_driver vicam_driver = {
1da177e4
LT		 817 .name = "vicam",
818 .probe = vicam_probe,
819 .disconnect = vicam_disconnect,
820 .id_table = vicam_table
821};
822
823/**
824 * vicam_probe
825 * @intf: the interface
826 * @id: the device id
827 *
828 * Called by the usb core when a new device is connected that it thinks
829 * this driver might be interested in.
830 */
831static int
832vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
833{
834 struct usb_device *dev = interface_to_usbdev(intf);
835 int bulkEndpoint = 0;
836 const struct usb_host_interface *interface;
837 const struct usb_endpoint_descriptor *endpoint;
838 struct vicam_camera *cam;
d56410e0 839
1da177e4
LT		 840 printk(KERN_INFO "ViCam based webcam connected\n");
841
842 interface = intf->cur_altsetting;
843
844 DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
845 interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
846 endpoint = &interface->endpoint[0].desc;
847
848 if ((endpoint->bEndpointAddress & 0x80) &&
849 ((endpoint->bmAttributes & 3) == 0x02)) {
850 /* we found a bulk in endpoint */
851 bulkEndpoint = endpoint->bEndpointAddress;
852 } else {
853 printk(KERN_ERR
854 "No bulk in endpoint was found ?! (this is bad)\n");
855 }
856
857 if ((cam =
dd00cc48 858 kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
1da177e4
LT		 859 printk(KERN_WARNING
860 "could not allocate kernel memory for vicam_camera struct\n");
861 return -ENOMEM;
862 }
863
1da177e4
LT		 864
865 cam->shutter_speed = 15;
866
4186ecf8 867 mutex_init(&cam->cam_lock);
1da177e4 868
601e9444
HV		 869 memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
870 video_set_drvdata(&cam->vdev, cam);
1da177e4
LT		 871
872 cam->udev = dev;
873 cam->bulkEndpoint = bulkEndpoint;
874
dc60de33 875 if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
1da177e4
LT		 876 kfree(cam);
877 printk(KERN_WARNING "video_register_device failed\n");
878 return -EIO;
879 }
880
1da177e4
LT		 881 printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",cam->vdev.minor);
882
883 usb_set_intfdata (intf, cam);
d56410e0 884
1da177e4
LT		 885 return 0;
886}
887
888static void
889vicam_disconnect(struct usb_interface *intf)
890{
891 int open_count;
892 struct vicam_camera *cam = usb_get_intfdata (intf);
893 usb_set_intfdata (intf, NULL);
894
895 /* we must unregister the device before taking its
896 * cam_lock. This is because the video open call
897 * holds the same lock as video unregister. if we
898 * unregister inside of the cam_lock and open also
899 * uses the cam_lock, we get deadlock.
900 */
901
902 video_unregister_device(&cam->vdev);
903
904 /* stop the camera from being used */
905
4186ecf8 906 mutex_lock(&cam->cam_lock);
1da177e4
LT		 907
908 /* mark the camera as gone */
909
910 cam->udev = NULL;
911
1da177e4
LT		 912 /* the only thing left to do is synchronize with
913 * our close/release function on who should release
914 * the camera memory. if there are any users using the
915 * camera, it's their job. if there are no users,
916 * it's ours.
917 */
918
919 open_count = cam->open_count;
920
4186ecf8 921 mutex_unlock(&cam->cam_lock);
1da177e4
LT		 922
923 if (!open_count) {
924 kfree(cam);
925 }
926
927 printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
928}
929
930/*
931 */
932static int __init
933usb_vicam_init(void)
934{
935 int retval;
936 DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
1da177e4
LT		 937 retval = usb_register(&vicam_driver);
938 if (retval)
939 printk(KERN_WARNING "usb_register failed!\n");
940 return retval;
941}
942
943static void __exit
944usb_vicam_exit(void)
945{
946 DBG(KERN_INFO
947 "ViCam-based WebCam driver shutdown\n");
948
949 usb_deregister(&vicam_driver);
1da177e4
LT		 950}
951
952module_init(usb_vicam_init);
953module_exit(usb_vicam_exit);
954
955MODULE_AUTHOR(DRIVER_AUTHOR);
956MODULE_DESCRIPTION(DRIVER_DESC);
957MODULE_LICENSE("GPL");
fb54be87 958MODULE_FIRMWARE("vicam/firmware.fw");
Linux kernel - Deliverables
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