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Merge branch 'fix/usb-audio' into for-linus
[deliverable/linux.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
37
38 #include "gspca.h"
39
40 /* global values */
41 #define DEF_NURBS 2 /* default number of URBs */
42
43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
45 MODULE_LICENSE("GPL");
46
47 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 4, 0)
48
49 static int video_nr = -1;
50
51 #ifdef GSPCA_DEBUG
52 int gspca_debug = D_ERR | D_PROBE;
53 EXPORT_SYMBOL(gspca_debug);
54
55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
56 {
57 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
58 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
59 txt,
60 pixfmt & 0xff,
61 (pixfmt >> 8) & 0xff,
62 (pixfmt >> 16) & 0xff,
63 pixfmt >> 24,
64 w, h);
65 } else {
66 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
67 txt,
68 pixfmt,
69 w, h);
70 }
71 }
72 #else
73 #define PDEBUG_MODE(txt, pixfmt, w, h)
74 #endif
75
76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
77 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
78 #define GSPCA_MEMORY_READ 7
79
80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
81
82 /*
83 * VMA operations.
84 */
85 static void gspca_vm_open(struct vm_area_struct *vma)
86 {
87 struct gspca_frame *frame = vma->vm_private_data;
88
89 frame->vma_use_count++;
90 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
91 }
92
93 static void gspca_vm_close(struct vm_area_struct *vma)
94 {
95 struct gspca_frame *frame = vma->vm_private_data;
96
97 if (--frame->vma_use_count <= 0)
98 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
99 }
100
101 static struct vm_operations_struct gspca_vm_ops = {
102 .open = gspca_vm_open,
103 .close = gspca_vm_close,
104 };
105
106 /* get the current input frame buffer */
107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
108 {
109 struct gspca_frame *frame;
110 int i;
111
112 i = gspca_dev->fr_i;
113 i = gspca_dev->fr_queue[i];
114 frame = &gspca_dev->frame[i];
115 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
116 != V4L2_BUF_FLAG_QUEUED)
117 return NULL;
118 return frame;
119 }
120 EXPORT_SYMBOL(gspca_get_i_frame);
121
122 /*
123 * fill a video frame from an URB and resubmit
124 */
125 static void fill_frame(struct gspca_dev *gspca_dev,
126 struct urb *urb)
127 {
128 struct gspca_frame *frame;
129 __u8 *data; /* address of data in the iso message */
130 int i, len, st;
131 cam_pkt_op pkt_scan;
132
133 if (urb->status != 0) {
134 #ifdef CONFIG_PM
135 if (!gspca_dev->frozen)
136 #endif
137 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
138 return; /* disconnection ? */
139 }
140 pkt_scan = gspca_dev->sd_desc->pkt_scan;
141 for (i = 0; i < urb->number_of_packets; i++) {
142
143 /* check the availability of the frame buffer */
144 frame = gspca_get_i_frame(gspca_dev);
145 if (!frame) {
146 gspca_dev->last_packet_type = DISCARD_PACKET;
147 break;
148 }
149
150 /* check the packet status and length */
151 len = urb->iso_frame_desc[i].actual_length;
152 if (len == 0) {
153 if (gspca_dev->empty_packet == 0)
154 gspca_dev->empty_packet = 1;
155 continue;
156 }
157 st = urb->iso_frame_desc[i].status;
158 if (st) {
159 PDEBUG(D_ERR,
160 "ISOC data error: [%d] len=%d, status=%d",
161 i, len, st);
162 gspca_dev->last_packet_type = DISCARD_PACKET;
163 continue;
164 }
165
166 /* let the packet be analyzed by the subdriver */
167 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
168 i, urb->iso_frame_desc[i].offset, len);
169 data = (__u8 *) urb->transfer_buffer
170 + urb->iso_frame_desc[i].offset;
171 pkt_scan(gspca_dev, frame, data, len);
172 }
173
174 /* resubmit the URB */
175 st = usb_submit_urb(urb, GFP_ATOMIC);
176 if (st < 0)
177 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
178 }
179
180 /*
181 * ISOC message interrupt from the USB device
182 *
183 * Analyse each packet and call the subdriver for copy to the frame buffer.
184 */
185 static void isoc_irq(struct urb *urb
186 )
187 {
188 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
189
190 PDEBUG(D_PACK, "isoc irq");
191 if (!gspca_dev->streaming)
192 return;
193 fill_frame(gspca_dev, urb);
194 }
195
196 /*
197 * bulk message interrupt from the USB device
198 */
199 static void bulk_irq(struct urb *urb
200 )
201 {
202 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
203 struct gspca_frame *frame;
204 int st;
205
206 PDEBUG(D_PACK, "bulk irq");
207 if (!gspca_dev->streaming)
208 return;
209 switch (urb->status) {
210 case 0:
211 break;
212 case -ECONNRESET:
213 urb->status = 0;
214 break;
215 default:
216 #ifdef CONFIG_PM
217 if (!gspca_dev->frozen)
218 #endif
219 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
220 return; /* disconnection ? */
221 }
222
223 /* check the availability of the frame buffer */
224 frame = gspca_get_i_frame(gspca_dev);
225 if (!frame) {
226 gspca_dev->last_packet_type = DISCARD_PACKET;
227 } else {
228 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
229 gspca_dev->sd_desc->pkt_scan(gspca_dev,
230 frame,
231 urb->transfer_buffer,
232 urb->actual_length);
233 }
234
235 /* resubmit the URB */
236 if (gspca_dev->cam.bulk_nurbs != 0) {
237 st = usb_submit_urb(urb, GFP_ATOMIC);
238 if (st < 0)
239 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
240 }
241 }
242
243 /*
244 * add data to the current frame
245 *
246 * This function is called by the subdrivers at interrupt level.
247 *
248 * To build a frame, these ones must add
249 * - one FIRST_PACKET
250 * - 0 or many INTER_PACKETs
251 * - one LAST_PACKET
252 * DISCARD_PACKET invalidates the whole frame.
253 * On LAST_PACKET, a new frame is returned.
254 */
255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
256 enum gspca_packet_type packet_type,
257 struct gspca_frame *frame,
258 const __u8 *data,
259 int len)
260 {
261 int i, j;
262
263 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
264
265 /* when start of a new frame, if the current frame buffer
266 * is not queued, discard the whole frame */
267 if (packet_type == FIRST_PACKET) {
268 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
269 != V4L2_BUF_FLAG_QUEUED) {
270 gspca_dev->last_packet_type = DISCARD_PACKET;
271 return frame;
272 }
273 frame->data_end = frame->data;
274 jiffies_to_timeval(get_jiffies_64(),
275 &frame->v4l2_buf.timestamp);
276 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
277 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
278 if (packet_type == LAST_PACKET)
279 gspca_dev->last_packet_type = packet_type;
280 return frame;
281 }
282
283 /* append the packet to the frame buffer */
284 if (len > 0) {
285 if (frame->data_end - frame->data + len
286 > frame->v4l2_buf.length) {
287 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
288 frame->data_end - frame->data + len,
289 frame->v4l2_buf.length);
290 packet_type = DISCARD_PACKET;
291 } else {
292 memcpy(frame->data_end, data, len);
293 frame->data_end += len;
294 }
295 }
296 gspca_dev->last_packet_type = packet_type;
297
298 /* if last packet, wake up the application and advance in the queue */
299 if (packet_type == LAST_PACKET) {
300 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
301 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
302 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
303 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
304 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
305 gspca_dev->fr_i = i;
306 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
307 frame->v4l2_buf.bytesused,
308 gspca_dev->fr_q,
309 i,
310 gspca_dev->fr_o);
311 j = gspca_dev->fr_queue[i];
312 frame = &gspca_dev->frame[j];
313 }
314 return frame;
315 }
316 EXPORT_SYMBOL(gspca_frame_add);
317
318 static int gspca_is_compressed(__u32 format)
319 {
320 switch (format) {
321 case V4L2_PIX_FMT_MJPEG:
322 case V4L2_PIX_FMT_JPEG:
323 case V4L2_PIX_FMT_SPCA561:
324 case V4L2_PIX_FMT_PAC207:
325 return 1;
326 }
327 return 0;
328 }
329
330 static void *rvmalloc(unsigned long size)
331 {
332 void *mem;
333 unsigned long adr;
334
335 mem = vmalloc_32(size);
336 if (mem != NULL) {
337 adr = (unsigned long) mem;
338 while ((long) size > 0) {
339 SetPageReserved(vmalloc_to_page((void *) adr));
340 adr += PAGE_SIZE;
341 size -= PAGE_SIZE;
342 }
343 }
344 return mem;
345 }
346
347 static void rvfree(void *mem, long size)
348 {
349 unsigned long adr;
350
351 adr = (unsigned long) mem;
352 while (size > 0) {
353 ClearPageReserved(vmalloc_to_page((void *) adr));
354 adr += PAGE_SIZE;
355 size -= PAGE_SIZE;
356 }
357 vfree(mem);
358 }
359
360 static int frame_alloc(struct gspca_dev *gspca_dev,
361 unsigned int count)
362 {
363 struct gspca_frame *frame;
364 unsigned int frsz;
365 int i;
366
367 i = gspca_dev->curr_mode;
368 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
369 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
370 frsz = PAGE_ALIGN(frsz);
371 gspca_dev->frsz = frsz;
372 if (count > GSPCA_MAX_FRAMES)
373 count = GSPCA_MAX_FRAMES;
374 gspca_dev->frbuf = rvmalloc(frsz * count);
375 if (!gspca_dev->frbuf) {
376 err("frame alloc failed");
377 return -ENOMEM;
378 }
379 gspca_dev->nframes = count;
380 for (i = 0; i < count; i++) {
381 frame = &gspca_dev->frame[i];
382 frame->v4l2_buf.index = i;
383 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
384 frame->v4l2_buf.flags = 0;
385 frame->v4l2_buf.field = V4L2_FIELD_NONE;
386 frame->v4l2_buf.length = frsz;
387 frame->v4l2_buf.memory = gspca_dev->memory;
388 frame->v4l2_buf.sequence = 0;
389 frame->data = frame->data_end =
390 gspca_dev->frbuf + i * frsz;
391 frame->v4l2_buf.m.offset = i * frsz;
392 }
393 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
394 gspca_dev->last_packet_type = DISCARD_PACKET;
395 gspca_dev->sequence = 0;
396 return 0;
397 }
398
399 static void frame_free(struct gspca_dev *gspca_dev)
400 {
401 int i;
402
403 PDEBUG(D_STREAM, "frame free");
404 if (gspca_dev->frbuf != NULL) {
405 rvfree(gspca_dev->frbuf,
406 gspca_dev->nframes * gspca_dev->frsz);
407 gspca_dev->frbuf = NULL;
408 for (i = 0; i < gspca_dev->nframes; i++)
409 gspca_dev->frame[i].data = NULL;
410 }
411 gspca_dev->nframes = 0;
412 }
413
414 static void destroy_urbs(struct gspca_dev *gspca_dev)
415 {
416 struct urb *urb;
417 unsigned int i;
418
419 PDEBUG(D_STREAM, "kill transfer");
420 for (i = 0; i < MAX_NURBS; i++) {
421 urb = gspca_dev->urb[i];
422 if (urb == NULL)
423 break;
424
425 gspca_dev->urb[i] = NULL;
426 if (!gspca_dev->present)
427 usb_kill_urb(urb);
428 if (urb->transfer_buffer != NULL)
429 usb_buffer_free(gspca_dev->dev,
430 urb->transfer_buffer_length,
431 urb->transfer_buffer,
432 urb->transfer_dma);
433 usb_free_urb(urb);
434 }
435 }
436
437 /*
438 * look for an input transfer endpoint in an alternate setting
439 */
440 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
441 __u8 epaddr,
442 __u8 xfer)
443 {
444 struct usb_host_endpoint *ep;
445 int i, attr;
446
447 epaddr |= USB_DIR_IN;
448 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
449 ep = &alt->endpoint[i];
450 if (ep->desc.bEndpointAddress == epaddr) {
451 attr = ep->desc.bmAttributes
452 & USB_ENDPOINT_XFERTYPE_MASK;
453 if (attr == xfer)
454 return ep;
455 break;
456 }
457 }
458 return NULL;
459 }
460
461 /*
462 * look for an input (isoc or bulk) endpoint
463 *
464 * The endpoint is defined by the subdriver.
465 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
466 * This routine may be called many times when the bandwidth is too small
467 * (the bandwidth is checked on urb submit).
468 */
469 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
470 {
471 struct usb_interface *intf;
472 struct usb_host_endpoint *ep;
473 int i, ret;
474
475 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
476 ep = NULL;
477 i = gspca_dev->alt; /* previous alt setting */
478
479 /* try isoc */
480 while (--i > 0) { /* alt 0 is unusable */
481 ep = alt_xfer(&intf->altsetting[i],
482 gspca_dev->cam.epaddr,
483 USB_ENDPOINT_XFER_ISOC);
484 if (ep)
485 break;
486 }
487
488 /* if no isoc, try bulk */
489 if (ep == NULL) {
490 ep = alt_xfer(&intf->altsetting[0],
491 gspca_dev->cam.epaddr,
492 USB_ENDPOINT_XFER_BULK);
493 if (ep == NULL) {
494 err("no transfer endpoint found");
495 return NULL;
496 }
497 }
498 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
499 i, ep->desc.bEndpointAddress);
500 if (i > 0) {
501 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
502 if (ret < 0) {
503 err("set interface err %d", ret);
504 return NULL;
505 }
506 }
507 gspca_dev->alt = i; /* memorize the current alt setting */
508 return ep;
509 }
510
511 /*
512 * create the URBs for image transfer
513 */
514 static int create_urbs(struct gspca_dev *gspca_dev,
515 struct usb_host_endpoint *ep)
516 {
517 struct urb *urb;
518 int n, nurbs, i, psize, npkt, bsize;
519
520 /* calculate the packet size and the number of packets */
521 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
522
523 if (gspca_dev->alt != 0) { /* isoc */
524
525 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
526 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
527 npkt = ISO_MAX_SIZE / psize;
528 if (npkt > ISO_MAX_PKT)
529 npkt = ISO_MAX_PKT;
530 bsize = psize * npkt;
531 PDEBUG(D_STREAM,
532 "isoc %d pkts size %d = bsize:%d",
533 npkt, psize, bsize);
534 nurbs = DEF_NURBS;
535 } else { /* bulk */
536 npkt = 0;
537 bsize = gspca_dev->cam.bulk_size;
538 if (bsize == 0)
539 bsize = psize;
540 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
541 if (gspca_dev->cam.bulk_nurbs != 0)
542 nurbs = gspca_dev->cam.bulk_nurbs;
543 else
544 nurbs = 1;
545 }
546
547 gspca_dev->nurbs = nurbs;
548 for (n = 0; n < nurbs; n++) {
549 urb = usb_alloc_urb(npkt, GFP_KERNEL);
550 if (!urb) {
551 err("usb_alloc_urb failed");
552 destroy_urbs(gspca_dev);
553 return -ENOMEM;
554 }
555 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
556 bsize,
557 GFP_KERNEL,
558 &urb->transfer_dma);
559
560 if (urb->transfer_buffer == NULL) {
561 usb_free_urb(urb);
562 err("usb_buffer_urb failed");
563 destroy_urbs(gspca_dev);
564 return -ENOMEM;
565 }
566 gspca_dev->urb[n] = urb;
567 urb->dev = gspca_dev->dev;
568 urb->context = gspca_dev;
569 urb->transfer_buffer_length = bsize;
570 if (npkt != 0) { /* ISOC */
571 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
572 ep->desc.bEndpointAddress);
573 urb->transfer_flags = URB_ISO_ASAP
574 | URB_NO_TRANSFER_DMA_MAP;
575 urb->interval = ep->desc.bInterval;
576 urb->complete = isoc_irq;
577 urb->number_of_packets = npkt;
578 for (i = 0; i < npkt; i++) {
579 urb->iso_frame_desc[i].length = psize;
580 urb->iso_frame_desc[i].offset = psize * i;
581 }
582 } else { /* bulk */
583 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
584 ep->desc.bEndpointAddress),
585 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
586 urb->complete = bulk_irq;
587 }
588 }
589 return 0;
590 }
591
592 /*
593 * start the USB transfer
594 */
595 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
596 {
597 struct usb_host_endpoint *ep;
598 int n, ret;
599
600 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
601 return -ERESTARTSYS;
602
603 /* set the higher alternate setting and
604 * loop until urb submit succeeds */
605 gspca_dev->alt = gspca_dev->nbalt;
606 for (;;) {
607 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
608 ep = get_ep(gspca_dev);
609 if (ep == NULL) {
610 ret = -EIO;
611 goto out;
612 }
613 ret = create_urbs(gspca_dev, ep);
614 if (ret < 0)
615 goto out;
616
617 /* clear the bulk endpoint */
618 if (gspca_dev->alt == 0) /* if bulk transfer */
619 usb_clear_halt(gspca_dev->dev,
620 usb_rcvintpipe(gspca_dev->dev,
621 gspca_dev->cam.epaddr));
622
623 /* start the cam */
624 ret = gspca_dev->sd_desc->start(gspca_dev);
625 if (ret < 0) {
626 destroy_urbs(gspca_dev);
627 goto out;
628 }
629 gspca_dev->streaming = 1;
630
631 /* some bulk transfers are started by the subdriver */
632 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
633 break;
634
635 /* submit the URBs */
636 for (n = 0; n < gspca_dev->nurbs; n++) {
637 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
638 if (ret < 0) {
639 PDEBUG(D_ERR|D_STREAM,
640 "usb_submit_urb [%d] err %d", n, ret);
641 gspca_dev->streaming = 0;
642 destroy_urbs(gspca_dev);
643 if (ret == -ENOSPC) {
644 msleep(20); /* wait for kill
645 * complete */
646 break; /* try the previous alt */
647 }
648 goto out;
649 }
650 }
651 if (ret >= 0)
652 break;
653 }
654 out:
655 mutex_unlock(&gspca_dev->usb_lock);
656 return ret;
657 }
658
659 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
660 {
661 int ret;
662
663 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
664 if (ret < 0)
665 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
666 return ret;
667 }
668
669 /* Note: both the queue and the usb locks should be held when calling this */
670 static void gspca_stream_off(struct gspca_dev *gspca_dev)
671 {
672 gspca_dev->streaming = 0;
673 if (gspca_dev->present
674 && gspca_dev->sd_desc->stopN)
675 gspca_dev->sd_desc->stopN(gspca_dev);
676 destroy_urbs(gspca_dev);
677 gspca_set_alt0(gspca_dev);
678 if (gspca_dev->sd_desc->stop0)
679 gspca_dev->sd_desc->stop0(gspca_dev);
680 PDEBUG(D_STREAM, "stream off OK");
681 }
682
683 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
684 {
685 int i;
686
687 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
688 gspca_dev->curr_mode = i;
689 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
690 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
691 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
692 }
693
694 static int wxh_to_mode(struct gspca_dev *gspca_dev,
695 int width, int height)
696 {
697 int i;
698
699 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
700 if (width >= gspca_dev->cam.cam_mode[i].width
701 && height >= gspca_dev->cam.cam_mode[i].height)
702 break;
703 }
704 return i;
705 }
706
707 /*
708 * search a mode with the right pixel format
709 */
710 static int gspca_get_mode(struct gspca_dev *gspca_dev,
711 int mode,
712 int pixfmt)
713 {
714 int modeU, modeD;
715
716 modeU = modeD = mode;
717 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
718 if (--modeD >= 0) {
719 if (gspca_dev->cam.cam_mode[modeD].pixelformat
720 == pixfmt)
721 return modeD;
722 }
723 if (++modeU < gspca_dev->cam.nmodes) {
724 if (gspca_dev->cam.cam_mode[modeU].pixelformat
725 == pixfmt)
726 return modeU;
727 }
728 }
729 return -EINVAL;
730 }
731
732 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
733 struct v4l2_fmtdesc *fmtdesc)
734 {
735 struct gspca_dev *gspca_dev = priv;
736 int i, j, index;
737 __u32 fmt_tb[8];
738
739 /* give an index to each format */
740 index = 0;
741 j = 0;
742 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
743 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
744 j = 0;
745 for (;;) {
746 if (fmt_tb[j] == fmt_tb[index])
747 break;
748 j++;
749 }
750 if (j == index) {
751 if (fmtdesc->index == index)
752 break; /* new format */
753 index++;
754 if (index >= ARRAY_SIZE(fmt_tb))
755 return -EINVAL;
756 }
757 }
758 if (i < 0)
759 return -EINVAL; /* no more format */
760
761 fmtdesc->pixelformat = fmt_tb[index];
762 if (gspca_is_compressed(fmt_tb[index]))
763 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
764 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
765 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
766 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
767 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
768 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
769 fmtdesc->description[4] = '\0';
770 return 0;
771 }
772
773 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
774 struct v4l2_format *fmt)
775 {
776 struct gspca_dev *gspca_dev = priv;
777 int mode;
778
779 mode = gspca_dev->curr_mode;
780 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
781 sizeof fmt->fmt.pix);
782 return 0;
783 }
784
785 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
786 struct v4l2_format *fmt)
787 {
788 int w, h, mode, mode2;
789
790 w = fmt->fmt.pix.width;
791 h = fmt->fmt.pix.height;
792
793 #ifdef GSPCA_DEBUG
794 if (gspca_debug & D_CONF)
795 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
796 #endif
797 /* search the closest mode for width and height */
798 mode = wxh_to_mode(gspca_dev, w, h);
799
800 /* OK if right palette */
801 if (gspca_dev->cam.cam_mode[mode].pixelformat
802 != fmt->fmt.pix.pixelformat) {
803
804 /* else, search the closest mode with the same pixel format */
805 mode2 = gspca_get_mode(gspca_dev, mode,
806 fmt->fmt.pix.pixelformat);
807 if (mode2 >= 0)
808 mode = mode2;
809 /* else
810 ; * no chance, return this mode */
811 }
812 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
813 sizeof fmt->fmt.pix);
814 return mode; /* used when s_fmt */
815 }
816
817 static int vidioc_try_fmt_vid_cap(struct file *file,
818 void *priv,
819 struct v4l2_format *fmt)
820 {
821 struct gspca_dev *gspca_dev = priv;
822 int ret;
823
824 ret = try_fmt_vid_cap(gspca_dev, fmt);
825 if (ret < 0)
826 return ret;
827 return 0;
828 }
829
830 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
831 struct v4l2_format *fmt)
832 {
833 struct gspca_dev *gspca_dev = priv;
834 int ret;
835
836 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
837 return -ERESTARTSYS;
838
839 ret = try_fmt_vid_cap(gspca_dev, fmt);
840 if (ret < 0)
841 goto out;
842
843 if (gspca_dev->nframes != 0
844 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
845 ret = -EINVAL;
846 goto out;
847 }
848
849 if (ret == gspca_dev->curr_mode) {
850 ret = 0;
851 goto out; /* same mode */
852 }
853
854 if (gspca_dev->streaming) {
855 ret = -EBUSY;
856 goto out;
857 }
858 gspca_dev->width = fmt->fmt.pix.width;
859 gspca_dev->height = fmt->fmt.pix.height;
860 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
861 gspca_dev->curr_mode = ret;
862
863 ret = 0;
864 out:
865 mutex_unlock(&gspca_dev->queue_lock);
866 return ret;
867 }
868
869 static void gspca_release(struct video_device *vfd)
870 {
871 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
872
873 PDEBUG(D_STREAM, "device released");
874
875 kfree(gspca_dev->usb_buf);
876 kfree(gspca_dev);
877 }
878
879 static int dev_open(struct file *file)
880 {
881 struct gspca_dev *gspca_dev;
882 int ret;
883
884 PDEBUG(D_STREAM, "%s open", current->comm);
885 gspca_dev = (struct gspca_dev *) video_devdata(file);
886 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
887 return -ERESTARTSYS;
888 if (!gspca_dev->present) {
889 ret = -ENODEV;
890 goto out;
891 }
892
893 if (gspca_dev->users > 4) { /* (arbitrary value) */
894 ret = -EBUSY;
895 goto out;
896 }
897
898 /* protect the subdriver against rmmod */
899 if (!try_module_get(gspca_dev->module)) {
900 ret = -ENODEV;
901 goto out;
902 }
903
904 gspca_dev->users++;
905
906 file->private_data = gspca_dev;
907 #ifdef GSPCA_DEBUG
908 /* activate the v4l2 debug */
909 if (gspca_debug & D_V4L2)
910 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
911 | V4L2_DEBUG_IOCTL_ARG;
912 else
913 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
914 | V4L2_DEBUG_IOCTL_ARG);
915 #endif
916 ret = 0;
917 out:
918 mutex_unlock(&gspca_dev->queue_lock);
919 if (ret != 0)
920 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
921 else
922 PDEBUG(D_STREAM, "open done");
923 return ret;
924 }
925
926 static int dev_close(struct file *file)
927 {
928 struct gspca_dev *gspca_dev = file->private_data;
929
930 PDEBUG(D_STREAM, "%s close", current->comm);
931 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
932 return -ERESTARTSYS;
933 gspca_dev->users--;
934
935 /* if the file did the capture, free the streaming resources */
936 if (gspca_dev->capt_file == file) {
937 if (gspca_dev->streaming) {
938 mutex_lock(&gspca_dev->usb_lock);
939 gspca_stream_off(gspca_dev);
940 mutex_unlock(&gspca_dev->usb_lock);
941 }
942 frame_free(gspca_dev);
943 gspca_dev->capt_file = NULL;
944 gspca_dev->memory = GSPCA_MEMORY_NO;
945 }
946 file->private_data = NULL;
947 module_put(gspca_dev->module);
948 mutex_unlock(&gspca_dev->queue_lock);
949
950 PDEBUG(D_STREAM, "close done");
951
952 return 0;
953 }
954
955 static int vidioc_querycap(struct file *file, void *priv,
956 struct v4l2_capability *cap)
957 {
958 struct gspca_dev *gspca_dev = priv;
959
960 memset(cap, 0, sizeof *cap);
961 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
962 if (gspca_dev->dev->product != NULL) {
963 strncpy(cap->card, gspca_dev->dev->product,
964 sizeof cap->card);
965 } else {
966 snprintf(cap->card, sizeof cap->card,
967 "USB Camera (%04x:%04x)",
968 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
969 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
970 }
971 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
972 sizeof cap->bus_info);
973 cap->version = DRIVER_VERSION_NUMBER;
974 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
975 | V4L2_CAP_STREAMING
976 | V4L2_CAP_READWRITE;
977 return 0;
978 }
979
980 static int vidioc_queryctrl(struct file *file, void *priv,
981 struct v4l2_queryctrl *q_ctrl)
982 {
983 struct gspca_dev *gspca_dev = priv;
984 int i, ix;
985 u32 id;
986
987 ix = -1;
988 id = q_ctrl->id;
989 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
990 id &= V4L2_CTRL_ID_MASK;
991 id++;
992 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
993 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
994 continue;
995 if (ix < 0) {
996 ix = i;
997 continue;
998 }
999 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1000 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1001 continue;
1002 ix = i;
1003 }
1004 }
1005 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1006 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1007 ix = i;
1008 break;
1009 }
1010 }
1011 if (ix < 0)
1012 return -EINVAL;
1013 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1014 sizeof *q_ctrl);
1015 if (gspca_dev->ctrl_dis & (1 << ix))
1016 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1017 return 0;
1018 }
1019
1020 static int vidioc_s_ctrl(struct file *file, void *priv,
1021 struct v4l2_control *ctrl)
1022 {
1023 struct gspca_dev *gspca_dev = priv;
1024 const struct ctrl *ctrls;
1025 int i, ret;
1026
1027 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1028 i < gspca_dev->sd_desc->nctrls;
1029 i++, ctrls++) {
1030 if (ctrl->id != ctrls->qctrl.id)
1031 continue;
1032 if (gspca_dev->ctrl_dis & (1 << i))
1033 return -EINVAL;
1034 if (ctrl->value < ctrls->qctrl.minimum
1035 || ctrl->value > ctrls->qctrl.maximum)
1036 return -ERANGE;
1037 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1038 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1039 return -ERESTARTSYS;
1040 ret = ctrls->set(gspca_dev, ctrl->value);
1041 mutex_unlock(&gspca_dev->usb_lock);
1042 return ret;
1043 }
1044 return -EINVAL;
1045 }
1046
1047 static int vidioc_g_ctrl(struct file *file, void *priv,
1048 struct v4l2_control *ctrl)
1049 {
1050 struct gspca_dev *gspca_dev = priv;
1051
1052 const struct ctrl *ctrls;
1053 int i, ret;
1054
1055 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1056 i < gspca_dev->sd_desc->nctrls;
1057 i++, ctrls++) {
1058 if (ctrl->id != ctrls->qctrl.id)
1059 continue;
1060 if (gspca_dev->ctrl_dis & (1 << i))
1061 return -EINVAL;
1062 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1063 return -ERESTARTSYS;
1064 ret = ctrls->get(gspca_dev, &ctrl->value);
1065 mutex_unlock(&gspca_dev->usb_lock);
1066 return ret;
1067 }
1068 return -EINVAL;
1069 }
1070
1071 /*fixme: have an audio flag in gspca_dev?*/
1072 static int vidioc_s_audio(struct file *file, void *priv,
1073 struct v4l2_audio *audio)
1074 {
1075 if (audio->index != 0)
1076 return -EINVAL;
1077 return 0;
1078 }
1079
1080 static int vidioc_g_audio(struct file *file, void *priv,
1081 struct v4l2_audio *audio)
1082 {
1083 memset(audio, 0, sizeof *audio);
1084 strcpy(audio->name, "Microphone");
1085 return 0;
1086 }
1087
1088 static int vidioc_enumaudio(struct file *file, void *priv,
1089 struct v4l2_audio *audio)
1090 {
1091 if (audio->index != 0)
1092 return -EINVAL;
1093
1094 strcpy(audio->name, "Microphone");
1095 audio->capability = 0;
1096 audio->mode = 0;
1097 return 0;
1098 }
1099
1100 static int vidioc_querymenu(struct file *file, void *priv,
1101 struct v4l2_querymenu *qmenu)
1102 {
1103 struct gspca_dev *gspca_dev = priv;
1104
1105 if (!gspca_dev->sd_desc->querymenu)
1106 return -EINVAL;
1107 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1108 }
1109
1110 static int vidioc_enum_input(struct file *file, void *priv,
1111 struct v4l2_input *input)
1112 {
1113 struct gspca_dev *gspca_dev = priv;
1114
1115 if (input->index != 0)
1116 return -EINVAL;
1117 memset(input, 0, sizeof *input);
1118 input->type = V4L2_INPUT_TYPE_CAMERA;
1119 strncpy(input->name, gspca_dev->sd_desc->name,
1120 sizeof input->name);
1121 return 0;
1122 }
1123
1124 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1125 {
1126 *i = 0;
1127 return 0;
1128 }
1129
1130 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1131 {
1132 if (i > 0)
1133 return -EINVAL;
1134 return (0);
1135 }
1136
1137 static int vidioc_reqbufs(struct file *file, void *priv,
1138 struct v4l2_requestbuffers *rb)
1139 {
1140 struct gspca_dev *gspca_dev = priv;
1141 int i, ret = 0;
1142
1143 switch (rb->memory) {
1144 case GSPCA_MEMORY_READ: /* (internal call) */
1145 case V4L2_MEMORY_MMAP:
1146 case V4L2_MEMORY_USERPTR:
1147 break;
1148 default:
1149 return -EINVAL;
1150 }
1151 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1152 return -ERESTARTSYS;
1153
1154 if (gspca_dev->memory != GSPCA_MEMORY_NO
1155 && gspca_dev->memory != rb->memory) {
1156 ret = -EBUSY;
1157 goto out;
1158 }
1159
1160 /* only one file may do the capture */
1161 if (gspca_dev->capt_file != NULL
1162 && gspca_dev->capt_file != file) {
1163 ret = -EBUSY;
1164 goto out;
1165 }
1166
1167 /* if allocated, the buffers must not be mapped */
1168 for (i = 0; i < gspca_dev->nframes; i++) {
1169 if (gspca_dev->frame[i].vma_use_count) {
1170 ret = -EBUSY;
1171 goto out;
1172 }
1173 }
1174
1175 /* stop streaming */
1176 if (gspca_dev->streaming) {
1177 mutex_lock(&gspca_dev->usb_lock);
1178 gspca_stream_off(gspca_dev);
1179 mutex_unlock(&gspca_dev->usb_lock);
1180 }
1181
1182 /* free the previous allocated buffers, if any */
1183 if (gspca_dev->nframes != 0) {
1184 frame_free(gspca_dev);
1185 gspca_dev->capt_file = NULL;
1186 }
1187 if (rb->count == 0) /* unrequest */
1188 goto out;
1189 gspca_dev->memory = rb->memory;
1190 ret = frame_alloc(gspca_dev, rb->count);
1191 if (ret == 0) {
1192 rb->count = gspca_dev->nframes;
1193 gspca_dev->capt_file = file;
1194 }
1195 out:
1196 mutex_unlock(&gspca_dev->queue_lock);
1197 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1198 return ret;
1199 }
1200
1201 static int vidioc_querybuf(struct file *file, void *priv,
1202 struct v4l2_buffer *v4l2_buf)
1203 {
1204 struct gspca_dev *gspca_dev = priv;
1205 struct gspca_frame *frame;
1206
1207 if (v4l2_buf->index < 0
1208 || v4l2_buf->index >= gspca_dev->nframes)
1209 return -EINVAL;
1210
1211 frame = &gspca_dev->frame[v4l2_buf->index];
1212 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1213 return 0;
1214 }
1215
1216 static int vidioc_streamon(struct file *file, void *priv,
1217 enum v4l2_buf_type buf_type)
1218 {
1219 struct gspca_dev *gspca_dev = priv;
1220 int ret;
1221
1222 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1223 return -EINVAL;
1224 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1225 return -ERESTARTSYS;
1226 if (!gspca_dev->present) {
1227 ret = -ENODEV;
1228 goto out;
1229 }
1230 if (gspca_dev->nframes == 0
1231 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1232 ret = -EINVAL;
1233 goto out;
1234 }
1235 if (!gspca_dev->streaming) {
1236 ret = gspca_init_transfer(gspca_dev);
1237 if (ret < 0)
1238 goto out;
1239 }
1240 #ifdef GSPCA_DEBUG
1241 if (gspca_debug & D_STREAM) {
1242 PDEBUG_MODE("stream on OK",
1243 gspca_dev->pixfmt,
1244 gspca_dev->width,
1245 gspca_dev->height);
1246 }
1247 #endif
1248 ret = 0;
1249 out:
1250 mutex_unlock(&gspca_dev->queue_lock);
1251 return ret;
1252 }
1253
1254 static int vidioc_streamoff(struct file *file, void *priv,
1255 enum v4l2_buf_type buf_type)
1256 {
1257 struct gspca_dev *gspca_dev = priv;
1258 int i, ret;
1259
1260 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1261 return -EINVAL;
1262 if (!gspca_dev->streaming)
1263 return 0;
1264 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1265 return -ERESTARTSYS;
1266
1267 /* stop streaming */
1268 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1269 ret = -ERESTARTSYS;
1270 goto out;
1271 }
1272 gspca_stream_off(gspca_dev);
1273 mutex_unlock(&gspca_dev->usb_lock);
1274
1275 /* empty the application queues */
1276 for (i = 0; i < gspca_dev->nframes; i++)
1277 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1278 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1279 gspca_dev->last_packet_type = DISCARD_PACKET;
1280 gspca_dev->sequence = 0;
1281 ret = 0;
1282 out:
1283 mutex_unlock(&gspca_dev->queue_lock);
1284 return ret;
1285 }
1286
1287 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1288 struct v4l2_jpegcompression *jpegcomp)
1289 {
1290 struct gspca_dev *gspca_dev = priv;
1291 int ret;
1292
1293 if (!gspca_dev->sd_desc->get_jcomp)
1294 return -EINVAL;
1295 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1296 return -ERESTARTSYS;
1297 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1298 mutex_unlock(&gspca_dev->usb_lock);
1299 return ret;
1300 }
1301
1302 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1303 struct v4l2_jpegcompression *jpegcomp)
1304 {
1305 struct gspca_dev *gspca_dev = priv;
1306 int ret;
1307
1308 if (!gspca_dev->sd_desc->set_jcomp)
1309 return -EINVAL;
1310 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1311 return -ERESTARTSYS;
1312 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1313 mutex_unlock(&gspca_dev->usb_lock);
1314 return ret;
1315 }
1316
1317 static int vidioc_g_parm(struct file *filp, void *priv,
1318 struct v4l2_streamparm *parm)
1319 {
1320 struct gspca_dev *gspca_dev = priv;
1321
1322 memset(parm, 0, sizeof *parm);
1323 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1324 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1325
1326 if (gspca_dev->sd_desc->get_streamparm) {
1327 int ret;
1328
1329 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1330 return -ERESTARTSYS;
1331 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1332 mutex_unlock(&gspca_dev->usb_lock);
1333 return ret;
1334 }
1335
1336 return 0;
1337 }
1338
1339 static int vidioc_s_parm(struct file *filp, void *priv,
1340 struct v4l2_streamparm *parm)
1341 {
1342 struct gspca_dev *gspca_dev = priv;
1343 int n;
1344
1345 n = parm->parm.capture.readbuffers;
1346 if (n == 0 || n > GSPCA_MAX_FRAMES)
1347 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1348 else
1349 gspca_dev->nbufread = n;
1350
1351 if (gspca_dev->sd_desc->set_streamparm) {
1352 int ret;
1353
1354 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1355 return -ERESTARTSYS;
1356 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1357 mutex_unlock(&gspca_dev->usb_lock);
1358 return ret;
1359 }
1360
1361 return 0;
1362 }
1363
1364 static int vidioc_s_std(struct file *filp, void *priv,
1365 v4l2_std_id *parm)
1366 {
1367 return 0;
1368 }
1369
1370 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1371 static int vidiocgmbuf(struct file *file, void *priv,
1372 struct video_mbuf *mbuf)
1373 {
1374 struct gspca_dev *gspca_dev = file->private_data;
1375 int i;
1376
1377 PDEBUG(D_STREAM, "cgmbuf");
1378 if (gspca_dev->nframes == 0) {
1379 int ret;
1380
1381 {
1382 struct v4l2_format fmt;
1383
1384 memset(&fmt, 0, sizeof fmt);
1385 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1386 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1387 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1388 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1389 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1390 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1391 if (ret != 0)
1392 return ret;
1393 }
1394 {
1395 struct v4l2_requestbuffers rb;
1396
1397 memset(&rb, 0, sizeof rb);
1398 rb.count = 4;
1399 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1400 rb.memory = V4L2_MEMORY_MMAP;
1401 ret = vidioc_reqbufs(file, priv, &rb);
1402 if (ret != 0)
1403 return ret;
1404 }
1405 }
1406 mbuf->frames = gspca_dev->nframes;
1407 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1408 for (i = 0; i < mbuf->frames; i++)
1409 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1410 return 0;
1411 }
1412 #endif
1413
1414 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1415 {
1416 struct gspca_dev *gspca_dev = file->private_data;
1417 struct gspca_frame *frame;
1418 struct page *page;
1419 unsigned long addr, start, size;
1420 int i, ret;
1421
1422 start = vma->vm_start;
1423 size = vma->vm_end - vma->vm_start;
1424 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1425
1426 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1427 return -ERESTARTSYS;
1428 if (!gspca_dev->present) {
1429 ret = -ENODEV;
1430 goto out;
1431 }
1432 if (gspca_dev->capt_file != file) {
1433 ret = -EINVAL;
1434 goto out;
1435 }
1436
1437 frame = NULL;
1438 for (i = 0; i < gspca_dev->nframes; ++i) {
1439 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1440 PDEBUG(D_STREAM, "mmap bad memory type");
1441 break;
1442 }
1443 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1444 == vma->vm_pgoff) {
1445 frame = &gspca_dev->frame[i];
1446 break;
1447 }
1448 }
1449 if (frame == NULL) {
1450 PDEBUG(D_STREAM, "mmap no frame buffer found");
1451 ret = -EINVAL;
1452 goto out;
1453 }
1454 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1455 /* v4l1 maps all the buffers */
1456 if (i != 0
1457 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1458 #endif
1459 if (size != frame->v4l2_buf.length) {
1460 PDEBUG(D_STREAM, "mmap bad size");
1461 ret = -EINVAL;
1462 goto out;
1463 }
1464
1465 /*
1466 * - VM_IO marks the area as being a mmaped region for I/O to a
1467 * device. It also prevents the region from being core dumped.
1468 */
1469 vma->vm_flags |= VM_IO;
1470
1471 addr = (unsigned long) frame->data;
1472 while (size > 0) {
1473 page = vmalloc_to_page((void *) addr);
1474 ret = vm_insert_page(vma, start, page);
1475 if (ret < 0)
1476 goto out;
1477 start += PAGE_SIZE;
1478 addr += PAGE_SIZE;
1479 size -= PAGE_SIZE;
1480 }
1481
1482 vma->vm_ops = &gspca_vm_ops;
1483 vma->vm_private_data = frame;
1484 gspca_vm_open(vma);
1485 ret = 0;
1486 out:
1487 mutex_unlock(&gspca_dev->queue_lock);
1488 return ret;
1489 }
1490
1491 /*
1492 * wait for a video frame
1493 *
1494 * If a frame is ready, its index is returned.
1495 */
1496 static int frame_wait(struct gspca_dev *gspca_dev,
1497 int nonblock_ing)
1498 {
1499 struct gspca_frame *frame;
1500 int i, j, ret;
1501
1502 /* check if a frame is ready */
1503 i = gspca_dev->fr_o;
1504 j = gspca_dev->fr_queue[i];
1505 frame = &gspca_dev->frame[j];
1506
1507 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1508 if (nonblock_ing)
1509 return -EAGAIN;
1510
1511 /* wait till a frame is ready */
1512 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1513 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1514 !gspca_dev->streaming || !gspca_dev->present,
1515 msecs_to_jiffies(3000));
1516 if (ret < 0)
1517 return ret;
1518 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1519 return -EIO;
1520 }
1521
1522 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1523 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1524 gspca_dev->fr_q,
1525 gspca_dev->fr_i,
1526 gspca_dev->fr_o);
1527
1528 if (gspca_dev->sd_desc->dq_callback) {
1529 mutex_lock(&gspca_dev->usb_lock);
1530 gspca_dev->sd_desc->dq_callback(gspca_dev);
1531 mutex_unlock(&gspca_dev->usb_lock);
1532 }
1533 return j;
1534 }
1535
1536 /*
1537 * dequeue a video buffer
1538 *
1539 * If nonblock_ing is false, block until a buffer is available.
1540 */
1541 static int vidioc_dqbuf(struct file *file, void *priv,
1542 struct v4l2_buffer *v4l2_buf)
1543 {
1544 struct gspca_dev *gspca_dev = priv;
1545 struct gspca_frame *frame;
1546 int i, ret;
1547
1548 PDEBUG(D_FRAM, "dqbuf");
1549 if (v4l2_buf->memory != gspca_dev->memory)
1550 return -EINVAL;
1551
1552 /* if not streaming, be sure the application will not loop forever */
1553 if (!(file->f_flags & O_NONBLOCK)
1554 && !gspca_dev->streaming && gspca_dev->users == 1)
1555 return -EINVAL;
1556
1557 /* only the capturing file may dequeue */
1558 if (gspca_dev->capt_file != file)
1559 return -EINVAL;
1560
1561 /* only one dequeue / read at a time */
1562 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1563 return -ERESTARTSYS;
1564
1565 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1566 if (ret < 0)
1567 goto out;
1568 i = ret; /* frame index */
1569 frame = &gspca_dev->frame[i];
1570 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1571 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1572 frame->data,
1573 frame->v4l2_buf.bytesused)) {
1574 PDEBUG(D_ERR|D_STREAM,
1575 "dqbuf cp to user failed");
1576 ret = -EFAULT;
1577 goto out;
1578 }
1579 }
1580 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1581 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1582 PDEBUG(D_FRAM, "dqbuf %d", i);
1583 ret = 0;
1584 out:
1585 mutex_unlock(&gspca_dev->read_lock);
1586 return ret;
1587 }
1588
1589 /*
1590 * queue a video buffer
1591 *
1592 * Attempting to queue a buffer that has already been
1593 * queued will return -EINVAL.
1594 */
1595 static int vidioc_qbuf(struct file *file, void *priv,
1596 struct v4l2_buffer *v4l2_buf)
1597 {
1598 struct gspca_dev *gspca_dev = priv;
1599 struct gspca_frame *frame;
1600 int i, index, ret;
1601
1602 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1603
1604 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1605 return -ERESTARTSYS;
1606
1607 index = v4l2_buf->index;
1608 if ((unsigned) index >= gspca_dev->nframes) {
1609 PDEBUG(D_FRAM,
1610 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1611 ret = -EINVAL;
1612 goto out;
1613 }
1614 if (v4l2_buf->memory != gspca_dev->memory) {
1615 PDEBUG(D_FRAM, "qbuf bad memory type");
1616 ret = -EINVAL;
1617 goto out;
1618 }
1619
1620 frame = &gspca_dev->frame[index];
1621 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1622 PDEBUG(D_FRAM, "qbuf bad state");
1623 ret = -EINVAL;
1624 goto out;
1625 }
1626
1627 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1628
1629 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1630 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1631 frame->v4l2_buf.length = v4l2_buf->length;
1632 }
1633
1634 /* put the buffer in the 'queued' queue */
1635 i = gspca_dev->fr_q;
1636 gspca_dev->fr_queue[i] = index;
1637 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1638 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1639 gspca_dev->fr_q,
1640 gspca_dev->fr_i,
1641 gspca_dev->fr_o);
1642
1643 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1644 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1645 ret = 0;
1646 out:
1647 mutex_unlock(&gspca_dev->queue_lock);
1648 return ret;
1649 }
1650
1651 /*
1652 * allocate the resources for read()
1653 */
1654 static int read_alloc(struct gspca_dev *gspca_dev,
1655 struct file *file)
1656 {
1657 struct v4l2_buffer v4l2_buf;
1658 int i, ret;
1659
1660 PDEBUG(D_STREAM, "read alloc");
1661 if (gspca_dev->nframes == 0) {
1662 struct v4l2_requestbuffers rb;
1663
1664 memset(&rb, 0, sizeof rb);
1665 rb.count = gspca_dev->nbufread;
1666 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1667 rb.memory = GSPCA_MEMORY_READ;
1668 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1669 if (ret != 0) {
1670 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1671 return ret;
1672 }
1673 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1674 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1675 v4l2_buf.memory = GSPCA_MEMORY_READ;
1676 for (i = 0; i < gspca_dev->nbufread; i++) {
1677 v4l2_buf.index = i;
1678 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1679 if (ret != 0) {
1680 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1681 return ret;
1682 }
1683 }
1684 gspca_dev->memory = GSPCA_MEMORY_READ;
1685 }
1686
1687 /* start streaming */
1688 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1689 if (ret != 0)
1690 PDEBUG(D_STREAM, "read streamon err %d", ret);
1691 return ret;
1692 }
1693
1694 static unsigned int dev_poll(struct file *file, poll_table *wait)
1695 {
1696 struct gspca_dev *gspca_dev = file->private_data;
1697 int i, ret;
1698
1699 PDEBUG(D_FRAM, "poll");
1700
1701 poll_wait(file, &gspca_dev->wq, wait);
1702 if (!gspca_dev->present)
1703 return POLLERR;
1704
1705 /* if reqbufs is not done, the user would use read() */
1706 if (gspca_dev->nframes == 0) {
1707 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1708 return POLLERR; /* not the 1st time */
1709 ret = read_alloc(gspca_dev, file);
1710 if (ret != 0)
1711 return POLLERR;
1712 }
1713
1714 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1715 return POLLERR;
1716 if (!gspca_dev->present) {
1717 ret = POLLERR;
1718 goto out;
1719 }
1720
1721 /* check the next incoming buffer */
1722 i = gspca_dev->fr_o;
1723 i = gspca_dev->fr_queue[i];
1724 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1725 ret = POLLIN | POLLRDNORM; /* something to read */
1726 else
1727 ret = 0;
1728 out:
1729 mutex_unlock(&gspca_dev->queue_lock);
1730 return ret;
1731 }
1732
1733 static ssize_t dev_read(struct file *file, char __user *data,
1734 size_t count, loff_t *ppos)
1735 {
1736 struct gspca_dev *gspca_dev = file->private_data;
1737 struct gspca_frame *frame;
1738 struct v4l2_buffer v4l2_buf;
1739 struct timeval timestamp;
1740 int n, ret, ret2;
1741
1742 PDEBUG(D_FRAM, "read (%zd)", count);
1743 if (!gspca_dev->present)
1744 return -ENODEV;
1745 switch (gspca_dev->memory) {
1746 case GSPCA_MEMORY_NO: /* first time */
1747 ret = read_alloc(gspca_dev, file);
1748 if (ret != 0)
1749 return ret;
1750 break;
1751 case GSPCA_MEMORY_READ:
1752 if (gspca_dev->capt_file == file)
1753 break;
1754 /* fall thru */
1755 default:
1756 return -EINVAL;
1757 }
1758
1759 /* get a frame */
1760 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1761 timestamp.tv_sec--;
1762 n = 2;
1763 for (;;) {
1764 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1765 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1766 v4l2_buf.memory = GSPCA_MEMORY_READ;
1767 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1768 if (ret != 0) {
1769 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1770 return ret;
1771 }
1772
1773 /* if the process slept for more than 1 second,
1774 * get a newer frame */
1775 frame = &gspca_dev->frame[v4l2_buf.index];
1776 if (--n < 0)
1777 break; /* avoid infinite loop */
1778 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1779 break;
1780 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1781 if (ret != 0) {
1782 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1783 return ret;
1784 }
1785 }
1786
1787 /* copy the frame */
1788 if (count > frame->v4l2_buf.bytesused)
1789 count = frame->v4l2_buf.bytesused;
1790 ret = copy_to_user(data, frame->data, count);
1791 if (ret != 0) {
1792 PDEBUG(D_ERR|D_STREAM,
1793 "read cp to user lack %d / %zd", ret, count);
1794 ret = -EFAULT;
1795 goto out;
1796 }
1797 ret = count;
1798 out:
1799 /* in each case, requeue the buffer */
1800 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1801 if (ret2 != 0)
1802 return ret2;
1803 return ret;
1804 }
1805
1806 static struct v4l2_file_operations dev_fops = {
1807 .owner = THIS_MODULE,
1808 .open = dev_open,
1809 .release = dev_close,
1810 .read = dev_read,
1811 .mmap = dev_mmap,
1812 .unlocked_ioctl = video_ioctl2,
1813 .poll = dev_poll,
1814 };
1815
1816 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1817 .vidioc_querycap = vidioc_querycap,
1818 .vidioc_dqbuf = vidioc_dqbuf,
1819 .vidioc_qbuf = vidioc_qbuf,
1820 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1821 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1822 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1823 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1824 .vidioc_streamon = vidioc_streamon,
1825 .vidioc_queryctrl = vidioc_queryctrl,
1826 .vidioc_g_ctrl = vidioc_g_ctrl,
1827 .vidioc_s_ctrl = vidioc_s_ctrl,
1828 .vidioc_g_audio = vidioc_g_audio,
1829 .vidioc_s_audio = vidioc_s_audio,
1830 .vidioc_enumaudio = vidioc_enumaudio,
1831 .vidioc_querymenu = vidioc_querymenu,
1832 .vidioc_enum_input = vidioc_enum_input,
1833 .vidioc_g_input = vidioc_g_input,
1834 .vidioc_s_input = vidioc_s_input,
1835 .vidioc_reqbufs = vidioc_reqbufs,
1836 .vidioc_querybuf = vidioc_querybuf,
1837 .vidioc_streamoff = vidioc_streamoff,
1838 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1839 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1840 .vidioc_g_parm = vidioc_g_parm,
1841 .vidioc_s_parm = vidioc_s_parm,
1842 .vidioc_s_std = vidioc_s_std,
1843 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1844 .vidiocgmbuf = vidiocgmbuf,
1845 #endif
1846 };
1847
1848 static struct video_device gspca_template = {
1849 .name = "gspca main driver",
1850 .fops = &dev_fops,
1851 .ioctl_ops = &dev_ioctl_ops,
1852 .release = gspca_release,
1853 .minor = -1,
1854 };
1855
1856 /*
1857 * probe and create a new gspca device
1858 *
1859 * This function must be called by the sub-driver when it is
1860 * called for probing a new device.
1861 */
1862 int gspca_dev_probe(struct usb_interface *intf,
1863 const struct usb_device_id *id,
1864 const struct sd_desc *sd_desc,
1865 int dev_size,
1866 struct module *module)
1867 {
1868 struct usb_interface_descriptor *interface;
1869 struct gspca_dev *gspca_dev;
1870 struct usb_device *dev = interface_to_usbdev(intf);
1871 int ret;
1872
1873 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1874
1875 /* we don't handle multi-config cameras */
1876 if (dev->descriptor.bNumConfigurations != 1)
1877 return -ENODEV;
1878 interface = &intf->cur_altsetting->desc;
1879 if (interface->bInterfaceNumber > 0)
1880 return -ENODEV;
1881
1882 /* create the device */
1883 if (dev_size < sizeof *gspca_dev)
1884 dev_size = sizeof *gspca_dev;
1885 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1886 if (!gspca_dev) {
1887 err("couldn't kzalloc gspca struct");
1888 return -ENOMEM;
1889 }
1890 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1891 if (!gspca_dev->usb_buf) {
1892 err("out of memory");
1893 ret = -ENOMEM;
1894 goto out;
1895 }
1896 gspca_dev->dev = dev;
1897 gspca_dev->iface = interface->bInterfaceNumber;
1898 gspca_dev->nbalt = intf->num_altsetting;
1899 gspca_dev->sd_desc = sd_desc;
1900 gspca_dev->nbufread = 2;
1901 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1902
1903 /* configure the subdriver and initialize the USB device */
1904 ret = sd_desc->config(gspca_dev, id);
1905 if (ret < 0)
1906 goto out;
1907 ret = sd_desc->init(gspca_dev);
1908 if (ret < 0)
1909 goto out;
1910 ret = gspca_set_alt0(gspca_dev);
1911 if (ret < 0)
1912 goto out;
1913 gspca_set_default_mode(gspca_dev);
1914
1915 mutex_init(&gspca_dev->usb_lock);
1916 mutex_init(&gspca_dev->read_lock);
1917 mutex_init(&gspca_dev->queue_lock);
1918 init_waitqueue_head(&gspca_dev->wq);
1919
1920 /* init video stuff */
1921 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1922 gspca_dev->vdev.parent = &dev->dev;
1923 gspca_dev->module = module;
1924 gspca_dev->present = 1;
1925 ret = video_register_device(&gspca_dev->vdev,
1926 VFL_TYPE_GRABBER,
1927 video_nr);
1928 if (ret < 0) {
1929 err("video_register_device err %d", ret);
1930 goto out;
1931 }
1932
1933 usb_set_intfdata(intf, gspca_dev);
1934 PDEBUG(D_PROBE, "probe ok");
1935 return 0;
1936 out:
1937 kfree(gspca_dev->usb_buf);
1938 kfree(gspca_dev);
1939 return ret;
1940 }
1941 EXPORT_SYMBOL(gspca_dev_probe);
1942
1943 /*
1944 * USB disconnection
1945 *
1946 * This function must be called by the sub-driver
1947 * when the device disconnects, after the specific resources are freed.
1948 */
1949 void gspca_disconnect(struct usb_interface *intf)
1950 {
1951 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1952
1953 gspca_dev->present = 0;
1954
1955 usb_set_intfdata(intf, NULL);
1956
1957 /* release the device */
1958 /* (this will call gspca_release() immediatly or on last close) */
1959 video_unregister_device(&gspca_dev->vdev);
1960
1961 PDEBUG(D_PROBE, "disconnect complete");
1962 }
1963 EXPORT_SYMBOL(gspca_disconnect);
1964
1965 #ifdef CONFIG_PM
1966 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1967 {
1968 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1969
1970 if (!gspca_dev->streaming)
1971 return 0;
1972 gspca_dev->frozen = 1; /* avoid urb error messages */
1973 if (gspca_dev->sd_desc->stopN)
1974 gspca_dev->sd_desc->stopN(gspca_dev);
1975 destroy_urbs(gspca_dev);
1976 gspca_set_alt0(gspca_dev);
1977 if (gspca_dev->sd_desc->stop0)
1978 gspca_dev->sd_desc->stop0(gspca_dev);
1979 return 0;
1980 }
1981 EXPORT_SYMBOL(gspca_suspend);
1982
1983 int gspca_resume(struct usb_interface *intf)
1984 {
1985 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1986
1987 gspca_dev->frozen = 0;
1988 gspca_dev->sd_desc->init(gspca_dev);
1989 if (gspca_dev->streaming)
1990 return gspca_init_transfer(gspca_dev);
1991 return 0;
1992 }
1993 EXPORT_SYMBOL(gspca_resume);
1994 #endif
1995 /* -- cam driver utility functions -- */
1996
1997 /* auto gain and exposure algorithm based on the knee algorithm described here:
1998 http://ytse.tricolour.net/docs/LowLightOptimization.html
1999
2000 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2001 where changed. */
2002 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2003 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2004 {
2005 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2006 const struct ctrl *gain_ctrl = NULL;
2007 const struct ctrl *exposure_ctrl = NULL;
2008 const struct ctrl *autogain_ctrl = NULL;
2009 int retval = 0;
2010
2011 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2012 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2013 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2015 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2016 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2017 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2018 }
2019 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2020 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2021 "on cam without (auto)gain/exposure");
2022 return 0;
2023 }
2024
2025 if (gain_ctrl->get(gspca_dev, &gain) ||
2026 exposure_ctrl->get(gspca_dev, &exposure) ||
2027 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2028 return 0;
2029
2030 orig_gain = gain;
2031 orig_exposure = exposure;
2032
2033 /* If we are of a multiple of deadzone, do multiple steps to reach the
2034 desired lumination fast (with the risc of a slight overshoot) */
2035 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2036
2037 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2038 avg_lum, desired_avg_lum, steps);
2039
2040 for (i = 0; i < steps; i++) {
2041 if (avg_lum > desired_avg_lum) {
2042 if (gain > gain_knee)
2043 gain--;
2044 else if (exposure > exposure_knee)
2045 exposure--;
2046 else if (gain > gain_ctrl->qctrl.default_value)
2047 gain--;
2048 else if (exposure > exposure_ctrl->qctrl.minimum)
2049 exposure--;
2050 else if (gain > gain_ctrl->qctrl.minimum)
2051 gain--;
2052 else
2053 break;
2054 } else {
2055 if (gain < gain_ctrl->qctrl.default_value)
2056 gain++;
2057 else if (exposure < exposure_knee)
2058 exposure++;
2059 else if (gain < gain_knee)
2060 gain++;
2061 else if (exposure < exposure_ctrl->qctrl.maximum)
2062 exposure++;
2063 else if (gain < gain_ctrl->qctrl.maximum)
2064 gain++;
2065 else
2066 break;
2067 }
2068 }
2069
2070 if (gain != orig_gain) {
2071 gain_ctrl->set(gspca_dev, gain);
2072 retval = 1;
2073 }
2074 if (exposure != orig_exposure) {
2075 exposure_ctrl->set(gspca_dev, exposure);
2076 retval = 1;
2077 }
2078
2079 return retval;
2080 }
2081 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2082
2083 /* -- module insert / remove -- */
2084 static int __init gspca_init(void)
2085 {
2086 info("main v%d.%d.%d registered",
2087 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2088 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2089 DRIVER_VERSION_NUMBER & 0xff);
2090 return 0;
2091 }
2092 static void __exit gspca_exit(void)
2093 {
2094 info("main deregistered");
2095 }
2096
2097 module_init(gspca_init);
2098 module_exit(gspca_exit);
2099
2100 #ifdef GSPCA_DEBUG
2101 module_param_named(debug, gspca_debug, int, 0644);
2102 MODULE_PARM_DESC(debug,
2103 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2104 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2105 " 0x0100: v4l2");
2106 #endif
Linux kernel - Deliverables
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