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V4L/DVB (10135): v4l2: introduce v4l2_file_operations.
[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 usb_kill_urb(urb);
427 if (urb->transfer_buffer != NULL)
428 usb_buffer_free(gspca_dev->dev,
429 urb->transfer_buffer_length,
430 urb->transfer_buffer,
431 urb->transfer_dma);
432 usb_free_urb(urb);
433 }
434 }
435
436 /*
437 * look for an input transfer endpoint in an alternate setting
438 */
439 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
440 __u8 epaddr,
441 __u8 xfer)
442 {
443 struct usb_host_endpoint *ep;
444 int i, attr;
445
446 epaddr |= USB_DIR_IN;
447 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
448 ep = &alt->endpoint[i];
449 if (ep->desc.bEndpointAddress == epaddr) {
450 attr = ep->desc.bmAttributes
451 & USB_ENDPOINT_XFERTYPE_MASK;
452 if (attr == xfer)
453 return ep;
454 break;
455 }
456 }
457 return NULL;
458 }
459
460 /*
461 * look for an input (isoc or bulk) endpoint
462 *
463 * The endpoint is defined by the subdriver.
464 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
465 * This routine may be called many times when the bandwidth is too small
466 * (the bandwidth is checked on urb submit).
467 */
468 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
469 {
470 struct usb_interface *intf;
471 struct usb_host_endpoint *ep;
472 int i, ret;
473
474 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
475 ep = NULL;
476 i = gspca_dev->alt; /* previous alt setting */
477
478 /* try isoc */
479 while (--i > 0) { /* alt 0 is unusable */
480 ep = alt_xfer(&intf->altsetting[i],
481 gspca_dev->cam.epaddr,
482 USB_ENDPOINT_XFER_ISOC);
483 if (ep)
484 break;
485 }
486
487 /* if no isoc, try bulk */
488 if (ep == NULL) {
489 ep = alt_xfer(&intf->altsetting[0],
490 gspca_dev->cam.epaddr,
491 USB_ENDPOINT_XFER_BULK);
492 if (ep == NULL) {
493 err("no transfer endpoint found");
494 return NULL;
495 }
496 }
497 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
498 i, ep->desc.bEndpointAddress);
499 if (i > 0) {
500 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
501 if (ret < 0) {
502 err("set interface err %d", ret);
503 return NULL;
504 }
505 }
506 gspca_dev->alt = i; /* memorize the current alt setting */
507 return ep;
508 }
509
510 /*
511 * create the URBs for image transfer
512 */
513 static int create_urbs(struct gspca_dev *gspca_dev,
514 struct usb_host_endpoint *ep)
515 {
516 struct urb *urb;
517 int n, nurbs, i, psize, npkt, bsize;
518
519 /* calculate the packet size and the number of packets */
520 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
521
522 if (gspca_dev->alt != 0) { /* isoc */
523
524 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
525 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
526 npkt = ISO_MAX_SIZE / psize;
527 if (npkt > ISO_MAX_PKT)
528 npkt = ISO_MAX_PKT;
529 bsize = psize * npkt;
530 PDEBUG(D_STREAM,
531 "isoc %d pkts size %d = bsize:%d",
532 npkt, psize, bsize);
533 nurbs = DEF_NURBS;
534 } else { /* bulk */
535 npkt = 0;
536 bsize = gspca_dev->cam.bulk_size;
537 if (bsize == 0)
538 bsize = psize;
539 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
540 if (gspca_dev->cam.bulk_nurbs != 0)
541 nurbs = gspca_dev->cam.bulk_nurbs;
542 else
543 nurbs = 1;
544 }
545
546 gspca_dev->nurbs = nurbs;
547 for (n = 0; n < nurbs; n++) {
548 urb = usb_alloc_urb(npkt, GFP_KERNEL);
549 if (!urb) {
550 err("usb_alloc_urb failed");
551 destroy_urbs(gspca_dev);
552 return -ENOMEM;
553 }
554 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
555 bsize,
556 GFP_KERNEL,
557 &urb->transfer_dma);
558
559 if (urb->transfer_buffer == NULL) {
560 usb_free_urb(urb);
561 err("usb_buffer_urb failed");
562 destroy_urbs(gspca_dev);
563 return -ENOMEM;
564 }
565 gspca_dev->urb[n] = urb;
566 urb->dev = gspca_dev->dev;
567 urb->context = gspca_dev;
568 urb->transfer_buffer_length = bsize;
569 if (npkt != 0) { /* ISOC */
570 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
571 ep->desc.bEndpointAddress);
572 urb->transfer_flags = URB_ISO_ASAP
573 | URB_NO_TRANSFER_DMA_MAP;
574 urb->interval = ep->desc.bInterval;
575 urb->complete = isoc_irq;
576 urb->number_of_packets = npkt;
577 for (i = 0; i < npkt; i++) {
578 urb->iso_frame_desc[i].length = psize;
579 urb->iso_frame_desc[i].offset = psize * i;
580 }
581 } else { /* bulk */
582 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
583 ep->desc.bEndpointAddress),
584 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
585 urb->complete = bulk_irq;
586 }
587 }
588 return 0;
589 }
590
591 /*
592 * start the USB transfer
593 */
594 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
595 {
596 struct usb_host_endpoint *ep;
597 int n, ret;
598
599 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
600 return -ERESTARTSYS;
601
602 /* set the higher alternate setting and
603 * loop until urb submit succeeds */
604 gspca_dev->alt = gspca_dev->nbalt;
605 for (;;) {
606 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
607 ep = get_ep(gspca_dev);
608 if (ep == NULL) {
609 ret = -EIO;
610 goto out;
611 }
612 ret = create_urbs(gspca_dev, ep);
613 if (ret < 0)
614 goto out;
615
616 /* clear the bulk endpoint */
617 if (gspca_dev->alt == 0) /* if bulk transfer */
618 usb_clear_halt(gspca_dev->dev,
619 usb_rcvintpipe(gspca_dev->dev,
620 gspca_dev->cam.epaddr));
621
622 /* start the cam */
623 ret = gspca_dev->sd_desc->start(gspca_dev);
624 if (ret < 0) {
625 destroy_urbs(gspca_dev);
626 goto out;
627 }
628 gspca_dev->streaming = 1;
629
630 /* some bulk transfers are started by the subdriver */
631 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
632 break;
633
634 /* submit the URBs */
635 for (n = 0; n < gspca_dev->nurbs; n++) {
636 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
637 if (ret < 0) {
638 PDEBUG(D_ERR|D_STREAM,
639 "usb_submit_urb [%d] err %d", n, ret);
640 gspca_dev->streaming = 0;
641 destroy_urbs(gspca_dev);
642 if (ret == -ENOSPC) {
643 msleep(20); /* wait for kill
644 * complete */
645 break; /* try the previous alt */
646 }
647 goto out;
648 }
649 }
650 if (ret >= 0)
651 break;
652 }
653 out:
654 mutex_unlock(&gspca_dev->usb_lock);
655 return ret;
656 }
657
658 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
659 {
660 int ret;
661
662 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
663 if (ret < 0)
664 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
665 return ret;
666 }
667
668 /* Note: both the queue and the usb locks should be held when calling this */
669 static void gspca_stream_off(struct gspca_dev *gspca_dev)
670 {
671 gspca_dev->streaming = 0;
672 if (gspca_dev->present
673 && gspca_dev->sd_desc->stopN)
674 gspca_dev->sd_desc->stopN(gspca_dev);
675 destroy_urbs(gspca_dev);
676 gspca_set_alt0(gspca_dev);
677 if (gspca_dev->sd_desc->stop0)
678 gspca_dev->sd_desc->stop0(gspca_dev);
679 PDEBUG(D_STREAM, "stream off OK");
680 }
681
682 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
683 {
684 int i;
685
686 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
687 gspca_dev->curr_mode = i;
688 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
689 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
690 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
691 }
692
693 static int wxh_to_mode(struct gspca_dev *gspca_dev,
694 int width, int height)
695 {
696 int i;
697
698 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
699 if (width >= gspca_dev->cam.cam_mode[i].width
700 && height >= gspca_dev->cam.cam_mode[i].height)
701 break;
702 }
703 return i;
704 }
705
706 /*
707 * search a mode with the right pixel format
708 */
709 static int gspca_get_mode(struct gspca_dev *gspca_dev,
710 int mode,
711 int pixfmt)
712 {
713 int modeU, modeD;
714
715 modeU = modeD = mode;
716 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
717 if (--modeD >= 0) {
718 if (gspca_dev->cam.cam_mode[modeD].pixelformat
719 == pixfmt)
720 return modeD;
721 }
722 if (++modeU < gspca_dev->cam.nmodes) {
723 if (gspca_dev->cam.cam_mode[modeU].pixelformat
724 == pixfmt)
725 return modeU;
726 }
727 }
728 return -EINVAL;
729 }
730
731 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
732 struct v4l2_fmtdesc *fmtdesc)
733 {
734 struct gspca_dev *gspca_dev = priv;
735 int i, j, index;
736 __u32 fmt_tb[8];
737
738 /* give an index to each format */
739 index = 0;
740 j = 0;
741 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
742 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
743 j = 0;
744 for (;;) {
745 if (fmt_tb[j] == fmt_tb[index])
746 break;
747 j++;
748 }
749 if (j == index) {
750 if (fmtdesc->index == index)
751 break; /* new format */
752 index++;
753 if (index >= ARRAY_SIZE(fmt_tb))
754 return -EINVAL;
755 }
756 }
757 if (i < 0)
758 return -EINVAL; /* no more format */
759
760 fmtdesc->pixelformat = fmt_tb[index];
761 if (gspca_is_compressed(fmt_tb[index]))
762 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
763 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
764 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
765 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
766 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
767 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
768 fmtdesc->description[4] = '\0';
769 return 0;
770 }
771
772 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
773 struct v4l2_format *fmt)
774 {
775 struct gspca_dev *gspca_dev = priv;
776 int mode;
777
778 mode = gspca_dev->curr_mode;
779 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
780 sizeof fmt->fmt.pix);
781 return 0;
782 }
783
784 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
785 struct v4l2_format *fmt)
786 {
787 int w, h, mode, mode2;
788
789 w = fmt->fmt.pix.width;
790 h = fmt->fmt.pix.height;
791
792 #ifdef GSPCA_DEBUG
793 if (gspca_debug & D_CONF)
794 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
795 #endif
796 /* search the closest mode for width and height */
797 mode = wxh_to_mode(gspca_dev, w, h);
798
799 /* OK if right palette */
800 if (gspca_dev->cam.cam_mode[mode].pixelformat
801 != fmt->fmt.pix.pixelformat) {
802
803 /* else, search the closest mode with the same pixel format */
804 mode2 = gspca_get_mode(gspca_dev, mode,
805 fmt->fmt.pix.pixelformat);
806 if (mode2 >= 0)
807 mode = mode2;
808 /* else
809 ; * no chance, return this mode */
810 }
811 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
812 sizeof fmt->fmt.pix);
813 return mode; /* used when s_fmt */
814 }
815
816 static int vidioc_try_fmt_vid_cap(struct file *file,
817 void *priv,
818 struct v4l2_format *fmt)
819 {
820 struct gspca_dev *gspca_dev = priv;
821 int ret;
822
823 ret = try_fmt_vid_cap(gspca_dev, fmt);
824 if (ret < 0)
825 return ret;
826 return 0;
827 }
828
829 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
830 struct v4l2_format *fmt)
831 {
832 struct gspca_dev *gspca_dev = priv;
833 int ret;
834
835 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
836 return -ERESTARTSYS;
837
838 ret = try_fmt_vid_cap(gspca_dev, fmt);
839 if (ret < 0)
840 goto out;
841
842 if (gspca_dev->nframes != 0
843 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
844 ret = -EINVAL;
845 goto out;
846 }
847
848 if (ret == gspca_dev->curr_mode) {
849 ret = 0;
850 goto out; /* same mode */
851 }
852
853 if (gspca_dev->streaming) {
854 ret = -EBUSY;
855 goto out;
856 }
857 gspca_dev->width = fmt->fmt.pix.width;
858 gspca_dev->height = fmt->fmt.pix.height;
859 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
860 gspca_dev->curr_mode = ret;
861
862 ret = 0;
863 out:
864 mutex_unlock(&gspca_dev->queue_lock);
865 return ret;
866 }
867
868 static void gspca_release(struct video_device *vfd)
869 {
870 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
871
872 PDEBUG(D_STREAM, "device released");
873
874 kfree(gspca_dev->usb_buf);
875 kfree(gspca_dev);
876 }
877
878 static int dev_open(struct file *file)
879 {
880 struct gspca_dev *gspca_dev;
881 int ret;
882
883 PDEBUG(D_STREAM, "%s open", current->comm);
884 gspca_dev = (struct gspca_dev *) video_devdata(file);
885 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
886 return -ERESTARTSYS;
887 if (!gspca_dev->present) {
888 ret = -ENODEV;
889 goto out;
890 }
891
892 if (gspca_dev->users > 4) { /* (arbitrary value) */
893 ret = -EBUSY;
894 goto out;
895 }
896
897 /* protect the subdriver against rmmod */
898 if (!try_module_get(gspca_dev->module)) {
899 ret = -ENODEV;
900 goto out;
901 }
902
903 gspca_dev->users++;
904
905 file->private_data = gspca_dev;
906 #ifdef GSPCA_DEBUG
907 /* activate the v4l2 debug */
908 if (gspca_debug & D_V4L2)
909 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
910 | V4L2_DEBUG_IOCTL_ARG;
911 else
912 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
913 | V4L2_DEBUG_IOCTL_ARG);
914 #endif
915 ret = 0;
916 out:
917 mutex_unlock(&gspca_dev->queue_lock);
918 if (ret != 0)
919 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
920 else
921 PDEBUG(D_STREAM, "open done");
922 return ret;
923 }
924
925 static int dev_close(struct file *file)
926 {
927 struct gspca_dev *gspca_dev = file->private_data;
928
929 PDEBUG(D_STREAM, "%s close", current->comm);
930 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
931 return -ERESTARTSYS;
932 gspca_dev->users--;
933
934 /* if the file did the capture, free the streaming resources */
935 if (gspca_dev->capt_file == file) {
936 if (gspca_dev->streaming) {
937 mutex_lock(&gspca_dev->usb_lock);
938 gspca_stream_off(gspca_dev);
939 mutex_unlock(&gspca_dev->usb_lock);
940 }
941 frame_free(gspca_dev);
942 gspca_dev->capt_file = NULL;
943 gspca_dev->memory = GSPCA_MEMORY_NO;
944 }
945 file->private_data = NULL;
946 module_put(gspca_dev->module);
947 mutex_unlock(&gspca_dev->queue_lock);
948
949 PDEBUG(D_STREAM, "close done");
950
951 return 0;
952 }
953
954 static int vidioc_querycap(struct file *file, void *priv,
955 struct v4l2_capability *cap)
956 {
957 struct gspca_dev *gspca_dev = priv;
958
959 memset(cap, 0, sizeof *cap);
960 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
961 if (gspca_dev->dev->product != NULL) {
962 strncpy(cap->card, gspca_dev->dev->product,
963 sizeof cap->card);
964 } else {
965 snprintf(cap->card, sizeof cap->card,
966 "USB Camera (%04x:%04x)",
967 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
968 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
969 }
970 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
971 sizeof cap->bus_info);
972 cap->version = DRIVER_VERSION_NUMBER;
973 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
974 | V4L2_CAP_STREAMING
975 | V4L2_CAP_READWRITE;
976 return 0;
977 }
978
979 static int vidioc_queryctrl(struct file *file, void *priv,
980 struct v4l2_queryctrl *q_ctrl)
981 {
982 struct gspca_dev *gspca_dev = priv;
983 int i, ix;
984 u32 id;
985
986 ix = -1;
987 id = q_ctrl->id;
988 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
989 id &= V4L2_CTRL_ID_MASK;
990 id++;
991 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
992 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
993 continue;
994 if (ix < 0) {
995 ix = i;
996 continue;
997 }
998 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
999 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1000 continue;
1001 ix = i;
1002 }
1003 }
1004 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1005 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1006 ix = i;
1007 break;
1008 }
1009 }
1010 if (ix < 0)
1011 return -EINVAL;
1012 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1013 sizeof *q_ctrl);
1014 if (gspca_dev->ctrl_dis & (1 << ix))
1015 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1016 return 0;
1017 }
1018
1019 static int vidioc_s_ctrl(struct file *file, void *priv,
1020 struct v4l2_control *ctrl)
1021 {
1022 struct gspca_dev *gspca_dev = priv;
1023 const struct ctrl *ctrls;
1024 int i, ret;
1025
1026 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1027 i < gspca_dev->sd_desc->nctrls;
1028 i++, ctrls++) {
1029 if (ctrl->id != ctrls->qctrl.id)
1030 continue;
1031 if (gspca_dev->ctrl_dis & (1 << i))
1032 return -EINVAL;
1033 if (ctrl->value < ctrls->qctrl.minimum
1034 || ctrl->value > ctrls->qctrl.maximum)
1035 return -ERANGE;
1036 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1037 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1038 return -ERESTARTSYS;
1039 ret = ctrls->set(gspca_dev, ctrl->value);
1040 mutex_unlock(&gspca_dev->usb_lock);
1041 return ret;
1042 }
1043 return -EINVAL;
1044 }
1045
1046 static int vidioc_g_ctrl(struct file *file, void *priv,
1047 struct v4l2_control *ctrl)
1048 {
1049 struct gspca_dev *gspca_dev = priv;
1050
1051 const struct ctrl *ctrls;
1052 int i, ret;
1053
1054 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1055 i < gspca_dev->sd_desc->nctrls;
1056 i++, ctrls++) {
1057 if (ctrl->id != ctrls->qctrl.id)
1058 continue;
1059 if (gspca_dev->ctrl_dis & (1 << i))
1060 return -EINVAL;
1061 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1062 return -ERESTARTSYS;
1063 ret = ctrls->get(gspca_dev, &ctrl->value);
1064 mutex_unlock(&gspca_dev->usb_lock);
1065 return ret;
1066 }
1067 return -EINVAL;
1068 }
1069
1070 /*fixme: have an audio flag in gspca_dev?*/
1071 static int vidioc_s_audio(struct file *file, void *priv,
1072 struct v4l2_audio *audio)
1073 {
1074 if (audio->index != 0)
1075 return -EINVAL;
1076 return 0;
1077 }
1078
1079 static int vidioc_g_audio(struct file *file, void *priv,
1080 struct v4l2_audio *audio)
1081 {
1082 memset(audio, 0, sizeof *audio);
1083 strcpy(audio->name, "Microphone");
1084 return 0;
1085 }
1086
1087 static int vidioc_enumaudio(struct file *file, void *priv,
1088 struct v4l2_audio *audio)
1089 {
1090 if (audio->index != 0)
1091 return -EINVAL;
1092
1093 strcpy(audio->name, "Microphone");
1094 audio->capability = 0;
1095 audio->mode = 0;
1096 return 0;
1097 }
1098
1099 static int vidioc_querymenu(struct file *file, void *priv,
1100 struct v4l2_querymenu *qmenu)
1101 {
1102 struct gspca_dev *gspca_dev = priv;
1103
1104 if (!gspca_dev->sd_desc->querymenu)
1105 return -EINVAL;
1106 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1107 }
1108
1109 static int vidioc_enum_input(struct file *file, void *priv,
1110 struct v4l2_input *input)
1111 {
1112 struct gspca_dev *gspca_dev = priv;
1113
1114 if (input->index != 0)
1115 return -EINVAL;
1116 memset(input, 0, sizeof *input);
1117 input->type = V4L2_INPUT_TYPE_CAMERA;
1118 strncpy(input->name, gspca_dev->sd_desc->name,
1119 sizeof input->name);
1120 return 0;
1121 }
1122
1123 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1124 {
1125 *i = 0;
1126 return 0;
1127 }
1128
1129 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1130 {
1131 if (i > 0)
1132 return -EINVAL;
1133 return (0);
1134 }
1135
1136 static int vidioc_reqbufs(struct file *file, void *priv,
1137 struct v4l2_requestbuffers *rb)
1138 {
1139 struct gspca_dev *gspca_dev = priv;
1140 int i, ret = 0;
1141
1142 switch (rb->memory) {
1143 case GSPCA_MEMORY_READ: /* (internal call) */
1144 case V4L2_MEMORY_MMAP:
1145 case V4L2_MEMORY_USERPTR:
1146 break;
1147 default:
1148 return -EINVAL;
1149 }
1150 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1151 return -ERESTARTSYS;
1152
1153 if (gspca_dev->memory != GSPCA_MEMORY_NO
1154 && gspca_dev->memory != rb->memory) {
1155 ret = -EBUSY;
1156 goto out;
1157 }
1158
1159 /* only one file may do the capture */
1160 if (gspca_dev->capt_file != NULL
1161 && gspca_dev->capt_file != file) {
1162 ret = -EBUSY;
1163 goto out;
1164 }
1165
1166 /* if allocated, the buffers must not be mapped */
1167 for (i = 0; i < gspca_dev->nframes; i++) {
1168 if (gspca_dev->frame[i].vma_use_count) {
1169 ret = -EBUSY;
1170 goto out;
1171 }
1172 }
1173
1174 /* stop streaming */
1175 if (gspca_dev->streaming) {
1176 mutex_lock(&gspca_dev->usb_lock);
1177 gspca_stream_off(gspca_dev);
1178 mutex_unlock(&gspca_dev->usb_lock);
1179 }
1180
1181 /* free the previous allocated buffers, if any */
1182 if (gspca_dev->nframes != 0) {
1183 frame_free(gspca_dev);
1184 gspca_dev->capt_file = NULL;
1185 }
1186 if (rb->count == 0) /* unrequest */
1187 goto out;
1188 gspca_dev->memory = rb->memory;
1189 ret = frame_alloc(gspca_dev, rb->count);
1190 if (ret == 0) {
1191 rb->count = gspca_dev->nframes;
1192 gspca_dev->capt_file = file;
1193 }
1194 out:
1195 mutex_unlock(&gspca_dev->queue_lock);
1196 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1197 return ret;
1198 }
1199
1200 static int vidioc_querybuf(struct file *file, void *priv,
1201 struct v4l2_buffer *v4l2_buf)
1202 {
1203 struct gspca_dev *gspca_dev = priv;
1204 struct gspca_frame *frame;
1205
1206 if (v4l2_buf->index < 0
1207 || v4l2_buf->index >= gspca_dev->nframes)
1208 return -EINVAL;
1209
1210 frame = &gspca_dev->frame[v4l2_buf->index];
1211 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1212 return 0;
1213 }
1214
1215 static int vidioc_streamon(struct file *file, void *priv,
1216 enum v4l2_buf_type buf_type)
1217 {
1218 struct gspca_dev *gspca_dev = priv;
1219 int ret;
1220
1221 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1222 return -EINVAL;
1223 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1224 return -ERESTARTSYS;
1225 if (!gspca_dev->present) {
1226 ret = -ENODEV;
1227 goto out;
1228 }
1229 if (gspca_dev->nframes == 0
1230 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1231 ret = -EINVAL;
1232 goto out;
1233 }
1234 if (!gspca_dev->streaming) {
1235 ret = gspca_init_transfer(gspca_dev);
1236 if (ret < 0)
1237 goto out;
1238 }
1239 #ifdef GSPCA_DEBUG
1240 if (gspca_debug & D_STREAM) {
1241 PDEBUG_MODE("stream on OK",
1242 gspca_dev->pixfmt,
1243 gspca_dev->width,
1244 gspca_dev->height);
1245 }
1246 #endif
1247 ret = 0;
1248 out:
1249 mutex_unlock(&gspca_dev->queue_lock);
1250 return ret;
1251 }
1252
1253 static int vidioc_streamoff(struct file *file, void *priv,
1254 enum v4l2_buf_type buf_type)
1255 {
1256 struct gspca_dev *gspca_dev = priv;
1257 int i, ret;
1258
1259 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1260 return -EINVAL;
1261 if (!gspca_dev->streaming)
1262 return 0;
1263 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1264 return -ERESTARTSYS;
1265
1266 /* stop streaming */
1267 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1268 ret = -ERESTARTSYS;
1269 goto out;
1270 }
1271 gspca_stream_off(gspca_dev);
1272 mutex_unlock(&gspca_dev->usb_lock);
1273
1274 /* empty the application queues */
1275 for (i = 0; i < gspca_dev->nframes; i++)
1276 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1277 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1278 gspca_dev->last_packet_type = DISCARD_PACKET;
1279 gspca_dev->sequence = 0;
1280 ret = 0;
1281 out:
1282 mutex_unlock(&gspca_dev->queue_lock);
1283 return ret;
1284 }
1285
1286 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1287 struct v4l2_jpegcompression *jpegcomp)
1288 {
1289 struct gspca_dev *gspca_dev = priv;
1290 int ret;
1291
1292 if (!gspca_dev->sd_desc->get_jcomp)
1293 return -EINVAL;
1294 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1295 return -ERESTARTSYS;
1296 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1297 mutex_unlock(&gspca_dev->usb_lock);
1298 return ret;
1299 }
1300
1301 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1302 struct v4l2_jpegcompression *jpegcomp)
1303 {
1304 struct gspca_dev *gspca_dev = priv;
1305 int ret;
1306
1307 if (!gspca_dev->sd_desc->set_jcomp)
1308 return -EINVAL;
1309 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1310 return -ERESTARTSYS;
1311 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1312 mutex_unlock(&gspca_dev->usb_lock);
1313 return ret;
1314 }
1315
1316 static int vidioc_g_parm(struct file *filp, void *priv,
1317 struct v4l2_streamparm *parm)
1318 {
1319 struct gspca_dev *gspca_dev = priv;
1320
1321 memset(parm, 0, sizeof *parm);
1322 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1323 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1324
1325 if (gspca_dev->sd_desc->get_streamparm) {
1326 int ret;
1327
1328 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1329 return -ERESTARTSYS;
1330 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1331 mutex_unlock(&gspca_dev->usb_lock);
1332 return ret;
1333 }
1334
1335 return 0;
1336 }
1337
1338 static int vidioc_s_parm(struct file *filp, void *priv,
1339 struct v4l2_streamparm *parm)
1340 {
1341 struct gspca_dev *gspca_dev = priv;
1342 int n;
1343
1344 n = parm->parm.capture.readbuffers;
1345 if (n == 0 || n > GSPCA_MAX_FRAMES)
1346 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1347 else
1348 gspca_dev->nbufread = n;
1349
1350 if (gspca_dev->sd_desc->set_streamparm) {
1351 int ret;
1352
1353 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1354 return -ERESTARTSYS;
1355 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1356 mutex_unlock(&gspca_dev->usb_lock);
1357 return ret;
1358 }
1359
1360 return 0;
1361 }
1362
1363 static int vidioc_s_std(struct file *filp, void *priv,
1364 v4l2_std_id *parm)
1365 {
1366 return 0;
1367 }
1368
1369 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1370 static int vidiocgmbuf(struct file *file, void *priv,
1371 struct video_mbuf *mbuf)
1372 {
1373 struct gspca_dev *gspca_dev = file->private_data;
1374 int i;
1375
1376 PDEBUG(D_STREAM, "cgmbuf");
1377 if (gspca_dev->nframes == 0) {
1378 int ret;
1379
1380 {
1381 struct v4l2_format fmt;
1382
1383 memset(&fmt, 0, sizeof fmt);
1384 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1385 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1386 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1387 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1388 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1389 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1390 if (ret != 0)
1391 return ret;
1392 }
1393 {
1394 struct v4l2_requestbuffers rb;
1395
1396 memset(&rb, 0, sizeof rb);
1397 rb.count = 4;
1398 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1399 rb.memory = V4L2_MEMORY_MMAP;
1400 ret = vidioc_reqbufs(file, priv, &rb);
1401 if (ret != 0)
1402 return ret;
1403 }
1404 }
1405 mbuf->frames = gspca_dev->nframes;
1406 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1407 for (i = 0; i < mbuf->frames; i++)
1408 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1409 return 0;
1410 }
1411 #endif
1412
1413 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1414 {
1415 struct gspca_dev *gspca_dev = file->private_data;
1416 struct gspca_frame *frame;
1417 struct page *page;
1418 unsigned long addr, start, size;
1419 int i, ret;
1420
1421 start = vma->vm_start;
1422 size = vma->vm_end - vma->vm_start;
1423 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1424
1425 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1426 return -ERESTARTSYS;
1427 if (!gspca_dev->present) {
1428 ret = -ENODEV;
1429 goto out;
1430 }
1431 if (gspca_dev->capt_file != file) {
1432 ret = -EINVAL;
1433 goto out;
1434 }
1435
1436 frame = NULL;
1437 for (i = 0; i < gspca_dev->nframes; ++i) {
1438 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1439 PDEBUG(D_STREAM, "mmap bad memory type");
1440 break;
1441 }
1442 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1443 == vma->vm_pgoff) {
1444 frame = &gspca_dev->frame[i];
1445 break;
1446 }
1447 }
1448 if (frame == NULL) {
1449 PDEBUG(D_STREAM, "mmap no frame buffer found");
1450 ret = -EINVAL;
1451 goto out;
1452 }
1453 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1454 /* v4l1 maps all the buffers */
1455 if (i != 0
1456 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1457 #endif
1458 if (size != frame->v4l2_buf.length) {
1459 PDEBUG(D_STREAM, "mmap bad size");
1460 ret = -EINVAL;
1461 goto out;
1462 }
1463
1464 /*
1465 * - VM_IO marks the area as being a mmaped region for I/O to a
1466 * device. It also prevents the region from being core dumped.
1467 */
1468 vma->vm_flags |= VM_IO;
1469
1470 addr = (unsigned long) frame->data;
1471 while (size > 0) {
1472 page = vmalloc_to_page((void *) addr);
1473 ret = vm_insert_page(vma, start, page);
1474 if (ret < 0)
1475 goto out;
1476 start += PAGE_SIZE;
1477 addr += PAGE_SIZE;
1478 size -= PAGE_SIZE;
1479 }
1480
1481 vma->vm_ops = &gspca_vm_ops;
1482 vma->vm_private_data = frame;
1483 gspca_vm_open(vma);
1484 ret = 0;
1485 out:
1486 mutex_unlock(&gspca_dev->queue_lock);
1487 return ret;
1488 }
1489
1490 /*
1491 * wait for a video frame
1492 *
1493 * If a frame is ready, its index is returned.
1494 */
1495 static int frame_wait(struct gspca_dev *gspca_dev,
1496 int nonblock_ing)
1497 {
1498 struct gspca_frame *frame;
1499 int i, j, ret;
1500
1501 /* check if a frame is ready */
1502 i = gspca_dev->fr_o;
1503 j = gspca_dev->fr_queue[i];
1504 frame = &gspca_dev->frame[j];
1505
1506 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1507 if (nonblock_ing)
1508 return -EAGAIN;
1509
1510 /* wait till a frame is ready */
1511 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1512 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1513 !gspca_dev->streaming || !gspca_dev->present,
1514 msecs_to_jiffies(3000));
1515 if (ret < 0)
1516 return ret;
1517 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1518 return -EIO;
1519 }
1520
1521 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1522 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1523 gspca_dev->fr_q,
1524 gspca_dev->fr_i,
1525 gspca_dev->fr_o);
1526
1527 if (gspca_dev->sd_desc->dq_callback) {
1528 mutex_lock(&gspca_dev->usb_lock);
1529 gspca_dev->sd_desc->dq_callback(gspca_dev);
1530 mutex_unlock(&gspca_dev->usb_lock);
1531 }
1532 return j;
1533 }
1534
1535 /*
1536 * dequeue a video buffer
1537 *
1538 * If nonblock_ing is false, block until a buffer is available.
1539 */
1540 static int vidioc_dqbuf(struct file *file, void *priv,
1541 struct v4l2_buffer *v4l2_buf)
1542 {
1543 struct gspca_dev *gspca_dev = priv;
1544 struct gspca_frame *frame;
1545 int i, ret;
1546
1547 PDEBUG(D_FRAM, "dqbuf");
1548 if (v4l2_buf->memory != gspca_dev->memory)
1549 return -EINVAL;
1550
1551 /* if not streaming, be sure the application will not loop forever */
1552 if (!(file->f_flags & O_NONBLOCK)
1553 && !gspca_dev->streaming && gspca_dev->users == 1)
1554 return -EINVAL;
1555
1556 /* only the capturing file may dequeue */
1557 if (gspca_dev->capt_file != file)
1558 return -EINVAL;
1559
1560 /* only one dequeue / read at a time */
1561 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1562 return -ERESTARTSYS;
1563
1564 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1565 if (ret < 0)
1566 goto out;
1567 i = ret; /* frame index */
1568 frame = &gspca_dev->frame[i];
1569 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1570 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1571 frame->data,
1572 frame->v4l2_buf.bytesused)) {
1573 PDEBUG(D_ERR|D_STREAM,
1574 "dqbuf cp to user failed");
1575 ret = -EFAULT;
1576 goto out;
1577 }
1578 }
1579 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1580 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1581 PDEBUG(D_FRAM, "dqbuf %d", i);
1582 ret = 0;
1583 out:
1584 mutex_unlock(&gspca_dev->read_lock);
1585 return ret;
1586 }
1587
1588 /*
1589 * queue a video buffer
1590 *
1591 * Attempting to queue a buffer that has already been
1592 * queued will return -EINVAL.
1593 */
1594 static int vidioc_qbuf(struct file *file, void *priv,
1595 struct v4l2_buffer *v4l2_buf)
1596 {
1597 struct gspca_dev *gspca_dev = priv;
1598 struct gspca_frame *frame;
1599 int i, index, ret;
1600
1601 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1602
1603 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1604 return -ERESTARTSYS;
1605
1606 index = v4l2_buf->index;
1607 if ((unsigned) index >= gspca_dev->nframes) {
1608 PDEBUG(D_FRAM,
1609 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1610 ret = -EINVAL;
1611 goto out;
1612 }
1613 if (v4l2_buf->memory != gspca_dev->memory) {
1614 PDEBUG(D_FRAM, "qbuf bad memory type");
1615 ret = -EINVAL;
1616 goto out;
1617 }
1618
1619 frame = &gspca_dev->frame[index];
1620 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1621 PDEBUG(D_FRAM, "qbuf bad state");
1622 ret = -EINVAL;
1623 goto out;
1624 }
1625
1626 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1627
1628 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1629 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1630 frame->v4l2_buf.length = v4l2_buf->length;
1631 }
1632
1633 /* put the buffer in the 'queued' queue */
1634 i = gspca_dev->fr_q;
1635 gspca_dev->fr_queue[i] = index;
1636 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1637 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1638 gspca_dev->fr_q,
1639 gspca_dev->fr_i,
1640 gspca_dev->fr_o);
1641
1642 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1643 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1644 ret = 0;
1645 out:
1646 mutex_unlock(&gspca_dev->queue_lock);
1647 return ret;
1648 }
1649
1650 /*
1651 * allocate the resources for read()
1652 */
1653 static int read_alloc(struct gspca_dev *gspca_dev,
1654 struct file *file)
1655 {
1656 struct v4l2_buffer v4l2_buf;
1657 int i, ret;
1658
1659 PDEBUG(D_STREAM, "read alloc");
1660 if (gspca_dev->nframes == 0) {
1661 struct v4l2_requestbuffers rb;
1662
1663 memset(&rb, 0, sizeof rb);
1664 rb.count = gspca_dev->nbufread;
1665 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1666 rb.memory = GSPCA_MEMORY_READ;
1667 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1668 if (ret != 0) {
1669 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1670 return ret;
1671 }
1672 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1673 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1674 v4l2_buf.memory = GSPCA_MEMORY_READ;
1675 for (i = 0; i < gspca_dev->nbufread; i++) {
1676 v4l2_buf.index = i;
1677 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1678 if (ret != 0) {
1679 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1680 return ret;
1681 }
1682 }
1683 gspca_dev->memory = GSPCA_MEMORY_READ;
1684 }
1685
1686 /* start streaming */
1687 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1688 if (ret != 0)
1689 PDEBUG(D_STREAM, "read streamon err %d", ret);
1690 return ret;
1691 }
1692
1693 static unsigned int dev_poll(struct file *file, poll_table *wait)
1694 {
1695 struct gspca_dev *gspca_dev = file->private_data;
1696 int i, ret;
1697
1698 PDEBUG(D_FRAM, "poll");
1699
1700 poll_wait(file, &gspca_dev->wq, wait);
1701 if (!gspca_dev->present)
1702 return POLLERR;
1703
1704 /* if reqbufs is not done, the user would use read() */
1705 if (gspca_dev->nframes == 0) {
1706 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1707 return POLLERR; /* not the 1st time */
1708 ret = read_alloc(gspca_dev, file);
1709 if (ret != 0)
1710 return POLLERR;
1711 }
1712
1713 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1714 return POLLERR;
1715 if (!gspca_dev->present) {
1716 ret = POLLERR;
1717 goto out;
1718 }
1719
1720 /* check the next incoming buffer */
1721 i = gspca_dev->fr_o;
1722 i = gspca_dev->fr_queue[i];
1723 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1724 ret = POLLIN | POLLRDNORM; /* something to read */
1725 else
1726 ret = 0;
1727 out:
1728 mutex_unlock(&gspca_dev->queue_lock);
1729 return ret;
1730 }
1731
1732 static ssize_t dev_read(struct file *file, char __user *data,
1733 size_t count, loff_t *ppos)
1734 {
1735 struct gspca_dev *gspca_dev = file->private_data;
1736 struct gspca_frame *frame;
1737 struct v4l2_buffer v4l2_buf;
1738 struct timeval timestamp;
1739 int n, ret, ret2;
1740
1741 PDEBUG(D_FRAM, "read (%zd)", count);
1742 if (!gspca_dev->present)
1743 return -ENODEV;
1744 switch (gspca_dev->memory) {
1745 case GSPCA_MEMORY_NO: /* first time */
1746 ret = read_alloc(gspca_dev, file);
1747 if (ret != 0)
1748 return ret;
1749 break;
1750 case GSPCA_MEMORY_READ:
1751 if (gspca_dev->capt_file == file)
1752 break;
1753 /* fall thru */
1754 default:
1755 return -EINVAL;
1756 }
1757
1758 /* get a frame */
1759 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1760 timestamp.tv_sec--;
1761 n = 2;
1762 for (;;) {
1763 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1764 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1765 v4l2_buf.memory = GSPCA_MEMORY_READ;
1766 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1767 if (ret != 0) {
1768 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1769 return ret;
1770 }
1771
1772 /* if the process slept for more than 1 second,
1773 * get a newer frame */
1774 frame = &gspca_dev->frame[v4l2_buf.index];
1775 if (--n < 0)
1776 break; /* avoid infinite loop */
1777 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1778 break;
1779 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1780 if (ret != 0) {
1781 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1782 return ret;
1783 }
1784 }
1785
1786 /* copy the frame */
1787 if (count > frame->v4l2_buf.bytesused)
1788 count = frame->v4l2_buf.bytesused;
1789 ret = copy_to_user(data, frame->data, count);
1790 if (ret != 0) {
1791 PDEBUG(D_ERR|D_STREAM,
1792 "read cp to user lack %d / %zd", ret, count);
1793 ret = -EFAULT;
1794 goto out;
1795 }
1796 ret = count;
1797 out:
1798 /* in each case, requeue the buffer */
1799 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1800 if (ret2 != 0)
1801 return ret2;
1802 return ret;
1803 }
1804
1805 static struct v4l2_file_operations dev_fops = {
1806 .owner = THIS_MODULE,
1807 .open = dev_open,
1808 .release = dev_close,
1809 .read = dev_read,
1810 .mmap = dev_mmap,
1811 .unlocked_ioctl = video_ioctl2,
1812 .poll = dev_poll,
1813 };
1814
1815 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1816 .vidioc_querycap = vidioc_querycap,
1817 .vidioc_dqbuf = vidioc_dqbuf,
1818 .vidioc_qbuf = vidioc_qbuf,
1819 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1820 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1821 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1822 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1823 .vidioc_streamon = vidioc_streamon,
1824 .vidioc_queryctrl = vidioc_queryctrl,
1825 .vidioc_g_ctrl = vidioc_g_ctrl,
1826 .vidioc_s_ctrl = vidioc_s_ctrl,
1827 .vidioc_g_audio = vidioc_g_audio,
1828 .vidioc_s_audio = vidioc_s_audio,
1829 .vidioc_enumaudio = vidioc_enumaudio,
1830 .vidioc_querymenu = vidioc_querymenu,
1831 .vidioc_enum_input = vidioc_enum_input,
1832 .vidioc_g_input = vidioc_g_input,
1833 .vidioc_s_input = vidioc_s_input,
1834 .vidioc_reqbufs = vidioc_reqbufs,
1835 .vidioc_querybuf = vidioc_querybuf,
1836 .vidioc_streamoff = vidioc_streamoff,
1837 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1838 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1839 .vidioc_g_parm = vidioc_g_parm,
1840 .vidioc_s_parm = vidioc_s_parm,
1841 .vidioc_s_std = vidioc_s_std,
1842 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1843 .vidiocgmbuf = vidiocgmbuf,
1844 #endif
1845 };
1846
1847 static struct video_device gspca_template = {
1848 .name = "gspca main driver",
1849 .fops = &dev_fops,
1850 .ioctl_ops = &dev_ioctl_ops,
1851 .release = gspca_release,
1852 .minor = -1,
1853 };
1854
1855 /*
1856 * probe and create a new gspca device
1857 *
1858 * This function must be called by the sub-driver when it is
1859 * called for probing a new device.
1860 */
1861 int gspca_dev_probe(struct usb_interface *intf,
1862 const struct usb_device_id *id,
1863 const struct sd_desc *sd_desc,
1864 int dev_size,
1865 struct module *module)
1866 {
1867 struct usb_interface_descriptor *interface;
1868 struct gspca_dev *gspca_dev;
1869 struct usb_device *dev = interface_to_usbdev(intf);
1870 int ret;
1871
1872 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1873
1874 /* we don't handle multi-config cameras */
1875 if (dev->descriptor.bNumConfigurations != 1)
1876 return -ENODEV;
1877 interface = &intf->cur_altsetting->desc;
1878 if (interface->bInterfaceNumber > 0)
1879 return -ENODEV;
1880
1881 /* create the device */
1882 if (dev_size < sizeof *gspca_dev)
1883 dev_size = sizeof *gspca_dev;
1884 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1885 if (!gspca_dev) {
1886 err("couldn't kzalloc gspca struct");
1887 return -ENOMEM;
1888 }
1889 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1890 if (!gspca_dev->usb_buf) {
1891 err("out of memory");
1892 ret = -ENOMEM;
1893 goto out;
1894 }
1895 gspca_dev->dev = dev;
1896 gspca_dev->iface = interface->bInterfaceNumber;
1897 gspca_dev->nbalt = intf->num_altsetting;
1898 gspca_dev->sd_desc = sd_desc;
1899 gspca_dev->nbufread = 2;
1900 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1901
1902 /* configure the subdriver and initialize the USB device */
1903 ret = sd_desc->config(gspca_dev, id);
1904 if (ret < 0)
1905 goto out;
1906 ret = sd_desc->init(gspca_dev);
1907 if (ret < 0)
1908 goto out;
1909 ret = gspca_set_alt0(gspca_dev);
1910 if (ret < 0)
1911 goto out;
1912 gspca_set_default_mode(gspca_dev);
1913
1914 mutex_init(&gspca_dev->usb_lock);
1915 mutex_init(&gspca_dev->read_lock);
1916 mutex_init(&gspca_dev->queue_lock);
1917 init_waitqueue_head(&gspca_dev->wq);
1918
1919 /* init video stuff */
1920 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1921 gspca_dev->vdev.parent = &dev->dev;
1922 gspca_dev->module = module;
1923 gspca_dev->present = 1;
1924 ret = video_register_device(&gspca_dev->vdev,
1925 VFL_TYPE_GRABBER,
1926 video_nr);
1927 if (ret < 0) {
1928 err("video_register_device err %d", ret);
1929 goto out;
1930 }
1931
1932 usb_set_intfdata(intf, gspca_dev);
1933 PDEBUG(D_PROBE, "probe ok");
1934 return 0;
1935 out:
1936 kfree(gspca_dev->usb_buf);
1937 kfree(gspca_dev);
1938 return ret;
1939 }
1940 EXPORT_SYMBOL(gspca_dev_probe);
1941
1942 /*
1943 * USB disconnection
1944 *
1945 * This function must be called by the sub-driver
1946 * when the device disconnects, after the specific resources are freed.
1947 */
1948 void gspca_disconnect(struct usb_interface *intf)
1949 {
1950 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1951
1952 gspca_dev->present = 0;
1953 gspca_dev->streaming = 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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