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V4L/DVB (10379): gspca - main: Use usb_make_path() for VIDIOC_QUERYCAP.
[linux-2.6/btrfs-unstable.git] / drivers / media / video / gspca / gspca.c
blobeac7aec442543eaac5825080238987f948a0450e
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 3 /* default number of URBs */
42 #if DEF_NURBS > MAX_NURBS
43 #error "DEF_NURBS too big"
44 #endif
45
46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
48 MODULE_LICENSE("GPL");
49
50 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 5, 0)
51
52 #ifdef GSPCA_DEBUG
53 int gspca_debug = D_ERR | D_PROBE;
54 EXPORT_SYMBOL(gspca_debug);
55
56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 {
58 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60 txt,
61 pixfmt & 0xff,
62 (pixfmt >> 8) & 0xff,
63 (pixfmt >> 16) & 0xff,
64 pixfmt >> 24,
65 w, h);
66 } else {
67 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68 txt,
69 pixfmt,
70 w, h);
71 }
72 }
73 #else
74 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 #endif
76
77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
78 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
79 #define GSPCA_MEMORY_READ 7
80
81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
82
83 /*
84 * VMA operations.
85 */
86 static void gspca_vm_open(struct vm_area_struct *vma)
87 {
88 struct gspca_frame *frame = vma->vm_private_data;
89
90 frame->vma_use_count++;
91 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 }
93
94 static void gspca_vm_close(struct vm_area_struct *vma)
95 {
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 if (--frame->vma_use_count <= 0)
99 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static struct vm_operations_struct gspca_vm_ops = {
103 .open = gspca_vm_open,
104 .close = gspca_vm_close,
105 };
106
107 /* get the current input frame buffer */
108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 {
110 struct gspca_frame *frame;
111 int i;
112
113 i = gspca_dev->fr_i;
114 i = gspca_dev->fr_queue[i];
115 frame = &gspca_dev->frame[i];
116 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117 != V4L2_BUF_FLAG_QUEUED)
118 return NULL;
119 return frame;
120 }
121 EXPORT_SYMBOL(gspca_get_i_frame);
122
123 /*
124 * fill a video frame from an URB and resubmit
125 */
126 static void fill_frame(struct gspca_dev *gspca_dev,
127 struct urb *urb)
128 {
129 struct gspca_frame *frame;
130 u8 *data; /* address of data in the iso message */
131 int i, len, st;
132 cam_pkt_op pkt_scan;
133
134 if (urb->status != 0) {
135 #ifdef CONFIG_PM
136 if (!gspca_dev->frozen)
137 #endif
138 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
139 return; /* disconnection ? */
140 }
141 pkt_scan = gspca_dev->sd_desc->pkt_scan;
142 for (i = 0; i < urb->number_of_packets; i++) {
143
144 /* check the availability of the frame buffer */
145 frame = gspca_get_i_frame(gspca_dev);
146 if (!frame) {
147 gspca_dev->last_packet_type = DISCARD_PACKET;
148 break;
149 }
150
151 /* check the packet status and length */
152 len = urb->iso_frame_desc[i].actual_length;
153 if (len == 0) {
154 if (gspca_dev->empty_packet == 0)
155 gspca_dev->empty_packet = 1;
156 continue;
157 }
158 st = urb->iso_frame_desc[i].status;
159 if (st) {
160 PDEBUG(D_ERR,
161 "ISOC data error: [%d] len=%d, status=%d",
162 i, len, st);
163 gspca_dev->last_packet_type = DISCARD_PACKET;
164 continue;
165 }
166
167 /* let the packet be analyzed by the subdriver */
168 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
169 i, urb->iso_frame_desc[i].offset, len);
170 data = (u8 *) urb->transfer_buffer
171 + urb->iso_frame_desc[i].offset;
172 pkt_scan(gspca_dev, frame, data, len);
173 }
174
175 /* resubmit the URB */
176 st = usb_submit_urb(urb, GFP_ATOMIC);
177 if (st < 0)
178 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
179 }
180
181 /*
182 * ISOC message interrupt from the USB device
183 *
184 * Analyse each packet and call the subdriver for copy to the frame buffer.
185 */
186 static void isoc_irq(struct urb *urb)
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 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
202 struct gspca_frame *frame;
203 int st;
204
205 PDEBUG(D_PACK, "bulk irq");
206 if (!gspca_dev->streaming)
207 return;
208 switch (urb->status) {
209 case 0:
210 break;
211 case -ECONNRESET:
212 urb->status = 0;
213 break;
214 default:
215 #ifdef CONFIG_PM
216 if (!gspca_dev->frozen)
217 #endif
218 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
219 return; /* disconnection ? */
220 }
221
222 /* check the availability of the frame buffer */
223 frame = gspca_get_i_frame(gspca_dev);
224 if (!frame) {
225 gspca_dev->last_packet_type = DISCARD_PACKET;
226 } else {
227 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
228 gspca_dev->sd_desc->pkt_scan(gspca_dev,
229 frame,
230 urb->transfer_buffer,
231 urb->actual_length);
232 }
233
234 /* resubmit the URB */
235 if (gspca_dev->cam.bulk_nurbs != 0) {
236 st = usb_submit_urb(urb, GFP_ATOMIC);
237 if (st < 0)
238 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
239 }
240 }
241
242 /*
243 * add data to the current frame
244 *
245 * This function is called by the subdrivers at interrupt level.
246 *
247 * To build a frame, these ones must add
248 * - one FIRST_PACKET
249 * - 0 or many INTER_PACKETs
250 * - one LAST_PACKET
251 * DISCARD_PACKET invalidates the whole frame.
252 * On LAST_PACKET, a new frame is returned.
253 */
254 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
255 enum gspca_packet_type packet_type,
256 struct gspca_frame *frame,
257 const __u8 *data,
258 int len)
259 {
260 int i, j;
261
262 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
263
264 /* when start of a new frame, if the current frame buffer
265 * is not queued, discard the whole frame */
266 if (packet_type == FIRST_PACKET) {
267 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
268 != V4L2_BUF_FLAG_QUEUED) {
269 gspca_dev->last_packet_type = DISCARD_PACKET;
270 return frame;
271 }
272 frame->data_end = frame->data;
273 jiffies_to_timeval(get_jiffies_64(),
274 &frame->v4l2_buf.timestamp);
275 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
276 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
277 if (packet_type == LAST_PACKET)
278 gspca_dev->last_packet_type = packet_type;
279 return frame;
280 }
281
282 /* append the packet to the frame buffer */
283 if (len > 0) {
284 if (frame->data_end - frame->data + len
285 > frame->v4l2_buf.length) {
286 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
287 frame->data_end - frame->data + len,
288 frame->v4l2_buf.length);
289 packet_type = DISCARD_PACKET;
290 } else {
291 memcpy(frame->data_end, data, len);
292 frame->data_end += len;
293 }
294 }
295 gspca_dev->last_packet_type = packet_type;
296
297 /* if last packet, wake up the application and advance in the queue */
298 if (packet_type == LAST_PACKET) {
299 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
300 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
301 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
302 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
303 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
304 gspca_dev->fr_i = i;
305 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
306 frame->v4l2_buf.bytesused,
307 gspca_dev->fr_q,
308 i,
309 gspca_dev->fr_o);
310 j = gspca_dev->fr_queue[i];
311 frame = &gspca_dev->frame[j];
312 }
313 return frame;
314 }
315 EXPORT_SYMBOL(gspca_frame_add);
316
317 static int gspca_is_compressed(__u32 format)
318 {
319 switch (format) {
320 case V4L2_PIX_FMT_MJPEG:
321 case V4L2_PIX_FMT_JPEG:
322 case V4L2_PIX_FMT_SPCA561:
323 case V4L2_PIX_FMT_PAC207:
324 case V4L2_PIX_FMT_MR97310A:
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 BUG_ON(!gspca_dev->dev);
426 gspca_dev->urb[i] = NULL;
427 if (!gspca_dev->present)
428 usb_kill_urb(urb);
429 if (urb->transfer_buffer != NULL)
430 usb_buffer_free(gspca_dev->dev,
431 urb->transfer_buffer_length,
432 urb->transfer_buffer,
433 urb->transfer_dma);
434 usb_free_urb(urb);
435 }
436 }
437
438 /*
439 * look for an input transfer endpoint in an alternate setting
440 */
441 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
442 __u8 xfer)
443 {
444 struct usb_host_endpoint *ep;
445 int i, attr;
446
447 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
448 ep = &alt->endpoint[i];
449 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
450 if (attr == xfer)
451 return ep;
452 }
453 return NULL;
454 }
455
456 /*
457 * look for an input (isoc or bulk) endpoint
458 *
459 * The endpoint is defined by the subdriver.
460 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
461 * This routine may be called many times when the bandwidth is too small
462 * (the bandwidth is checked on urb submit).
463 */
464 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
465 {
466 struct usb_interface *intf;
467 struct usb_host_endpoint *ep;
468 int i, ret;
469
470 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
471 ep = NULL;
472 i = gspca_dev->alt; /* previous alt setting */
473
474 /* try isoc */
475 while (--i > 0) { /* alt 0 is unusable */
476 ep = alt_xfer(&intf->altsetting[i],
477 USB_ENDPOINT_XFER_ISOC);
478 if (ep)
479 break;
480 }
481
482 /* if no isoc, try bulk */
483 if (ep == NULL) {
484 ep = alt_xfer(&intf->altsetting[0],
485 USB_ENDPOINT_XFER_BULK);
486 if (ep == NULL) {
487 err("no transfer endpoint found");
488 return NULL;
489 }
490 }
491 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
492 i, ep->desc.bEndpointAddress);
493 if (i > 0) {
494 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
495 if (ret < 0) {
496 err("set interface err %d", ret);
497 return NULL;
498 }
499 }
500 gspca_dev->alt = i; /* memorize the current alt setting */
501 return ep;
502 }
503
504 /*
505 * create the URBs for image transfer
506 */
507 static int create_urbs(struct gspca_dev *gspca_dev,
508 struct usb_host_endpoint *ep)
509 {
510 struct urb *urb;
511 int n, nurbs, i, psize, npkt, bsize;
512
513 /* calculate the packet size and the number of packets */
514 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
515
516 if (gspca_dev->alt != 0) { /* isoc */
517
518 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
519 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
520 npkt = ISO_MAX_SIZE / psize;
521 if (npkt > ISO_MAX_PKT)
522 npkt = ISO_MAX_PKT;
523 bsize = psize * npkt;
524 PDEBUG(D_STREAM,
525 "isoc %d pkts size %d = bsize:%d",
526 npkt, psize, bsize);
527 nurbs = DEF_NURBS;
528 } else { /* bulk */
529 npkt = 0;
530 bsize = gspca_dev->cam.bulk_size;
531 if (bsize == 0)
532 bsize = psize;
533 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
534 if (gspca_dev->cam.bulk_nurbs != 0)
535 nurbs = gspca_dev->cam.bulk_nurbs;
536 else
537 nurbs = 1;
538 }
539
540 gspca_dev->nurbs = nurbs;
541 for (n = 0; n < nurbs; n++) {
542 urb = usb_alloc_urb(npkt, GFP_KERNEL);
543 if (!urb) {
544 err("usb_alloc_urb failed");
545 destroy_urbs(gspca_dev);
546 return -ENOMEM;
547 }
548 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
549 bsize,
550 GFP_KERNEL,
551 &urb->transfer_dma);
552
553 if (urb->transfer_buffer == NULL) {
554 usb_free_urb(urb);
555 err("usb_buffer_urb failed");
556 destroy_urbs(gspca_dev);
557 return -ENOMEM;
558 }
559 gspca_dev->urb[n] = urb;
560 urb->dev = gspca_dev->dev;
561 urb->context = gspca_dev;
562 urb->transfer_buffer_length = bsize;
563 if (npkt != 0) { /* ISOC */
564 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
565 ep->desc.bEndpointAddress);
566 urb->transfer_flags = URB_ISO_ASAP
567 | URB_NO_TRANSFER_DMA_MAP;
568 urb->interval = ep->desc.bInterval;
569 urb->complete = isoc_irq;
570 urb->number_of_packets = npkt;
571 for (i = 0; i < npkt; i++) {
572 urb->iso_frame_desc[i].length = psize;
573 urb->iso_frame_desc[i].offset = psize * i;
574 }
575 } else { /* bulk */
576 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
577 ep->desc.bEndpointAddress),
578 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
579 urb->complete = bulk_irq;
580 }
581 }
582 return 0;
583 }
584
585 /*
586 * start the USB transfer
587 */
588 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
589 {
590 struct usb_host_endpoint *ep;
591 int n, ret;
592
593 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
594 return -ERESTARTSYS;
595
596 /* set the higher alternate setting and
597 * loop until urb submit succeeds */
598 gspca_dev->alt = gspca_dev->nbalt;
599 for (;;) {
600 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
601 ep = get_ep(gspca_dev);
602 if (ep == NULL) {
603 ret = -EIO;
604 goto out;
605 }
606 ret = create_urbs(gspca_dev, ep);
607 if (ret < 0)
608 goto out;
609
610 /* clear the bulk endpoint */
611 if (gspca_dev->alt == 0) /* if bulk transfer */
612 usb_clear_halt(gspca_dev->dev,
613 gspca_dev->urb[0]->pipe);
614
615 /* start the cam */
616 ret = gspca_dev->sd_desc->start(gspca_dev);
617 if (ret < 0) {
618 destroy_urbs(gspca_dev);
619 goto out;
620 }
621 gspca_dev->streaming = 1;
622
623 /* some bulk transfers are started by the subdriver */
624 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
625 break;
626
627 /* submit the URBs */
628 for (n = 0; n < gspca_dev->nurbs; n++) {
629 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
630 if (ret < 0) {
631 PDEBUG(D_ERR|D_STREAM,
632 "usb_submit_urb [%d] err %d", n, ret);
633 gspca_dev->streaming = 0;
634 destroy_urbs(gspca_dev);
635 if (ret == -ENOSPC) {
636 msleep(20); /* wait for kill
637 * complete */
638 break; /* try the previous alt */
639 }
640 goto out;
641 }
642 }
643 if (ret >= 0)
644 break;
645 }
646 out:
647 mutex_unlock(&gspca_dev->usb_lock);
648 return ret;
649 }
650
651 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
652 {
653 int ret;
654
655 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
656 if (ret < 0)
657 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
658 return ret;
659 }
660
661 /* Note: both the queue and the usb locks should be held when calling this */
662 static void gspca_stream_off(struct gspca_dev *gspca_dev)
663 {
664 gspca_dev->streaming = 0;
665 if (gspca_dev->present
666 && gspca_dev->sd_desc->stopN)
667 gspca_dev->sd_desc->stopN(gspca_dev);
668 destroy_urbs(gspca_dev);
669 if (gspca_dev->present)
670 gspca_set_alt0(gspca_dev);
671 if (gspca_dev->sd_desc->stop0)
672 gspca_dev->sd_desc->stop0(gspca_dev);
673 PDEBUG(D_STREAM, "stream off OK");
674 }
675
676 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
677 {
678 int i;
679
680 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
681 gspca_dev->curr_mode = i;
682 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
683 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
684 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
685 }
686
687 static int wxh_to_mode(struct gspca_dev *gspca_dev,
688 int width, int height)
689 {
690 int i;
691
692 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
693 if (width >= gspca_dev->cam.cam_mode[i].width
694 && height >= gspca_dev->cam.cam_mode[i].height)
695 break;
696 }
697 return i;
698 }
699
700 /*
701 * search a mode with the right pixel format
702 */
703 static int gspca_get_mode(struct gspca_dev *gspca_dev,
704 int mode,
705 int pixfmt)
706 {
707 int modeU, modeD;
708
709 modeU = modeD = mode;
710 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
711 if (--modeD >= 0) {
712 if (gspca_dev->cam.cam_mode[modeD].pixelformat
713 == pixfmt)
714 return modeD;
715 }
716 if (++modeU < gspca_dev->cam.nmodes) {
717 if (gspca_dev->cam.cam_mode[modeU].pixelformat
718 == pixfmt)
719 return modeU;
720 }
721 }
722 return -EINVAL;
723 }
724
725 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
726 struct v4l2_fmtdesc *fmtdesc)
727 {
728 struct gspca_dev *gspca_dev = priv;
729 int i, j, index;
730 __u32 fmt_tb[8];
731
732 /* give an index to each format */
733 index = 0;
734 j = 0;
735 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
736 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
737 j = 0;
738 for (;;) {
739 if (fmt_tb[j] == fmt_tb[index])
740 break;
741 j++;
742 }
743 if (j == index) {
744 if (fmtdesc->index == index)
745 break; /* new format */
746 index++;
747 if (index >= ARRAY_SIZE(fmt_tb))
748 return -EINVAL;
749 }
750 }
751 if (i < 0)
752 return -EINVAL; /* no more format */
753
754 fmtdesc->pixelformat = fmt_tb[index];
755 if (gspca_is_compressed(fmt_tb[index]))
756 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
757 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
758 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
759 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
760 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
761 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
762 fmtdesc->description[4] = '\0';
763 return 0;
764 }
765
766 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
767 struct v4l2_format *fmt)
768 {
769 struct gspca_dev *gspca_dev = priv;
770 int mode;
771
772 mode = gspca_dev->curr_mode;
773 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
774 sizeof fmt->fmt.pix);
775 return 0;
776 }
777
778 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
779 struct v4l2_format *fmt)
780 {
781 int w, h, mode, mode2;
782
783 w = fmt->fmt.pix.width;
784 h = fmt->fmt.pix.height;
785
786 #ifdef GSPCA_DEBUG
787 if (gspca_debug & D_CONF)
788 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
789 #endif
790 /* search the closest mode for width and height */
791 mode = wxh_to_mode(gspca_dev, w, h);
792
793 /* OK if right palette */
794 if (gspca_dev->cam.cam_mode[mode].pixelformat
795 != fmt->fmt.pix.pixelformat) {
796
797 /* else, search the closest mode with the same pixel format */
798 mode2 = gspca_get_mode(gspca_dev, mode,
799 fmt->fmt.pix.pixelformat);
800 if (mode2 >= 0)
801 mode = mode2;
802 /* else
803 ; * no chance, return this mode */
804 }
805 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
806 sizeof fmt->fmt.pix);
807 return mode; /* used when s_fmt */
808 }
809
810 static int vidioc_try_fmt_vid_cap(struct file *file,
811 void *priv,
812 struct v4l2_format *fmt)
813 {
814 struct gspca_dev *gspca_dev = priv;
815 int ret;
816
817 ret = try_fmt_vid_cap(gspca_dev, fmt);
818 if (ret < 0)
819 return ret;
820 return 0;
821 }
822
823 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
824 struct v4l2_format *fmt)
825 {
826 struct gspca_dev *gspca_dev = priv;
827 int ret;
828
829 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
830 return -ERESTARTSYS;
831
832 ret = try_fmt_vid_cap(gspca_dev, fmt);
833 if (ret < 0)
834 goto out;
835
836 if (gspca_dev->nframes != 0
837 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
838 ret = -EINVAL;
839 goto out;
840 }
841
842 if (ret == gspca_dev->curr_mode) {
843 ret = 0;
844 goto out; /* same mode */
845 }
846
847 if (gspca_dev->streaming) {
848 ret = -EBUSY;
849 goto out;
850 }
851 gspca_dev->width = fmt->fmt.pix.width;
852 gspca_dev->height = fmt->fmt.pix.height;
853 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
854 gspca_dev->curr_mode = ret;
855
856 ret = 0;
857 out:
858 mutex_unlock(&gspca_dev->queue_lock);
859 return ret;
860 }
861
862 static void gspca_release(struct video_device *vfd)
863 {
864 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
865
866 PDEBUG(D_STREAM, "device released");
867
868 kfree(gspca_dev->usb_buf);
869 kfree(gspca_dev);
870 }
871
872 static int dev_open(struct file *file)
873 {
874 struct gspca_dev *gspca_dev;
875 int ret;
876
877 PDEBUG(D_STREAM, "%s open", current->comm);
878 gspca_dev = (struct gspca_dev *) video_devdata(file);
879 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
880 return -ERESTARTSYS;
881 if (!gspca_dev->present) {
882 ret = -ENODEV;
883 goto out;
884 }
885
886 if (gspca_dev->users > 4) { /* (arbitrary value) */
887 ret = -EBUSY;
888 goto out;
889 }
890
891 /* protect the subdriver against rmmod */
892 if (!try_module_get(gspca_dev->module)) {
893 ret = -ENODEV;
894 goto out;
895 }
896
897 gspca_dev->users++;
898
899 file->private_data = gspca_dev;
900 #ifdef GSPCA_DEBUG
901 /* activate the v4l2 debug */
902 if (gspca_debug & D_V4L2)
903 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
904 | V4L2_DEBUG_IOCTL_ARG;
905 else
906 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
907 | V4L2_DEBUG_IOCTL_ARG);
908 #endif
909 ret = 0;
910 out:
911 mutex_unlock(&gspca_dev->queue_lock);
912 if (ret != 0)
913 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
914 else
915 PDEBUG(D_STREAM, "open done");
916 return ret;
917 }
918
919 static int dev_close(struct file *file)
920 {
921 struct gspca_dev *gspca_dev = file->private_data;
922
923 PDEBUG(D_STREAM, "%s close", current->comm);
924 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
925 return -ERESTARTSYS;
926 gspca_dev->users--;
927
928 /* if the file did the capture, free the streaming resources */
929 if (gspca_dev->capt_file == file) {
930 if (gspca_dev->streaming) {
931 mutex_lock(&gspca_dev->usb_lock);
932 gspca_stream_off(gspca_dev);
933 mutex_unlock(&gspca_dev->usb_lock);
934 }
935 frame_free(gspca_dev);
936 gspca_dev->capt_file = NULL;
937 gspca_dev->memory = GSPCA_MEMORY_NO;
938 }
939 file->private_data = NULL;
940 module_put(gspca_dev->module);
941 mutex_unlock(&gspca_dev->queue_lock);
942
943 PDEBUG(D_STREAM, "close done");
944
945 return 0;
946 }
947
948 static int vidioc_querycap(struct file *file, void *priv,
949 struct v4l2_capability *cap)
950 {
951 struct gspca_dev *gspca_dev = priv;
952
953 memset(cap, 0, sizeof *cap);
954 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
955 if (gspca_dev->dev->product != NULL) {
956 strncpy(cap->card, gspca_dev->dev->product,
957 sizeof cap->card);
958 } else {
959 snprintf(cap->card, sizeof cap->card,
960 "USB Camera (%04x:%04x)",
961 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
962 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
963 }
964 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
965 cap->version = DRIVER_VERSION_NUMBER;
966 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
967 | V4L2_CAP_STREAMING
968 | V4L2_CAP_READWRITE;
969 return 0;
970 }
971
972 static int vidioc_queryctrl(struct file *file, void *priv,
973 struct v4l2_queryctrl *q_ctrl)
974 {
975 struct gspca_dev *gspca_dev = priv;
976 int i, ix;
977 u32 id;
978
979 ix = -1;
980 id = q_ctrl->id;
981 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
982 id &= V4L2_CTRL_ID_MASK;
983 id++;
984 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
985 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
986 continue;
987 if (ix < 0) {
988 ix = i;
989 continue;
990 }
991 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
992 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
993 continue;
994 ix = i;
995 }
996 }
997 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
998 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
999 ix = i;
1000 break;
1001 }
1002 }
1003 if (ix < 0)
1004 return -EINVAL;
1005 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1006 sizeof *q_ctrl);
1007 if (gspca_dev->ctrl_dis & (1 << ix))
1008 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1009 return 0;
1010 }
1011
1012 static int vidioc_s_ctrl(struct file *file, void *priv,
1013 struct v4l2_control *ctrl)
1014 {
1015 struct gspca_dev *gspca_dev = priv;
1016 const struct ctrl *ctrls;
1017 int i, ret;
1018
1019 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1020 i < gspca_dev->sd_desc->nctrls;
1021 i++, ctrls++) {
1022 if (ctrl->id != ctrls->qctrl.id)
1023 continue;
1024 if (gspca_dev->ctrl_dis & (1 << i))
1025 return -EINVAL;
1026 if (ctrl->value < ctrls->qctrl.minimum
1027 || ctrl->value > ctrls->qctrl.maximum)
1028 return -ERANGE;
1029 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1030 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1031 return -ERESTARTSYS;
1032 ret = ctrls->set(gspca_dev, ctrl->value);
1033 mutex_unlock(&gspca_dev->usb_lock);
1034 return ret;
1035 }
1036 return -EINVAL;
1037 }
1038
1039 static int vidioc_g_ctrl(struct file *file, void *priv,
1040 struct v4l2_control *ctrl)
1041 {
1042 struct gspca_dev *gspca_dev = priv;
1043
1044 const struct ctrl *ctrls;
1045 int i, ret;
1046
1047 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1048 i < gspca_dev->sd_desc->nctrls;
1049 i++, ctrls++) {
1050 if (ctrl->id != ctrls->qctrl.id)
1051 continue;
1052 if (gspca_dev->ctrl_dis & (1 << i))
1053 return -EINVAL;
1054 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1055 return -ERESTARTSYS;
1056 ret = ctrls->get(gspca_dev, &ctrl->value);
1057 mutex_unlock(&gspca_dev->usb_lock);
1058 return ret;
1059 }
1060 return -EINVAL;
1061 }
1062
1063 /*fixme: have an audio flag in gspca_dev?*/
1064 static int vidioc_s_audio(struct file *file, void *priv,
1065 struct v4l2_audio *audio)
1066 {
1067 if (audio->index != 0)
1068 return -EINVAL;
1069 return 0;
1070 }
1071
1072 static int vidioc_g_audio(struct file *file, void *priv,
1073 struct v4l2_audio *audio)
1074 {
1075 memset(audio, 0, sizeof *audio);
1076 strcpy(audio->name, "Microphone");
1077 return 0;
1078 }
1079
1080 static int vidioc_enumaudio(struct file *file, void *priv,
1081 struct v4l2_audio *audio)
1082 {
1083 if (audio->index != 0)
1084 return -EINVAL;
1085
1086 strcpy(audio->name, "Microphone");
1087 audio->capability = 0;
1088 audio->mode = 0;
1089 return 0;
1090 }
1091
1092 static int vidioc_querymenu(struct file *file, void *priv,
1093 struct v4l2_querymenu *qmenu)
1094 {
1095 struct gspca_dev *gspca_dev = priv;
1096
1097 if (!gspca_dev->sd_desc->querymenu)
1098 return -EINVAL;
1099 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1100 }
1101
1102 static int vidioc_enum_input(struct file *file, void *priv,
1103 struct v4l2_input *input)
1104 {
1105 struct gspca_dev *gspca_dev = priv;
1106
1107 if (input->index != 0)
1108 return -EINVAL;
1109 memset(input, 0, sizeof *input);
1110 input->type = V4L2_INPUT_TYPE_CAMERA;
1111 strncpy(input->name, gspca_dev->sd_desc->name,
1112 sizeof input->name);
1113 return 0;
1114 }
1115
1116 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1117 {
1118 *i = 0;
1119 return 0;
1120 }
1121
1122 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1123 {
1124 if (i > 0)
1125 return -EINVAL;
1126 return (0);
1127 }
1128
1129 static int vidioc_reqbufs(struct file *file, void *priv,
1130 struct v4l2_requestbuffers *rb)
1131 {
1132 struct gspca_dev *gspca_dev = priv;
1133 int i, ret = 0;
1134
1135 switch (rb->memory) {
1136 case GSPCA_MEMORY_READ: /* (internal call) */
1137 case V4L2_MEMORY_MMAP:
1138 case V4L2_MEMORY_USERPTR:
1139 break;
1140 default:
1141 return -EINVAL;
1142 }
1143 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1144 return -ERESTARTSYS;
1145
1146 if (gspca_dev->memory != GSPCA_MEMORY_NO
1147 && gspca_dev->memory != rb->memory) {
1148 ret = -EBUSY;
1149 goto out;
1150 }
1151
1152 /* only one file may do the capture */
1153 if (gspca_dev->capt_file != NULL
1154 && gspca_dev->capt_file != file) {
1155 ret = -EBUSY;
1156 goto out;
1157 }
1158
1159 /* if allocated, the buffers must not be mapped */
1160 for (i = 0; i < gspca_dev->nframes; i++) {
1161 if (gspca_dev->frame[i].vma_use_count) {
1162 ret = -EBUSY;
1163 goto out;
1164 }
1165 }
1166
1167 /* stop streaming */
1168 if (gspca_dev->streaming) {
1169 mutex_lock(&gspca_dev->usb_lock);
1170 gspca_stream_off(gspca_dev);
1171 mutex_unlock(&gspca_dev->usb_lock);
1172 }
1173
1174 /* free the previous allocated buffers, if any */
1175 if (gspca_dev->nframes != 0) {
1176 frame_free(gspca_dev);
1177 gspca_dev->capt_file = NULL;
1178 }
1179 if (rb->count == 0) /* unrequest */
1180 goto out;
1181 gspca_dev->memory = rb->memory;
1182 ret = frame_alloc(gspca_dev, rb->count);
1183 if (ret == 0) {
1184 rb->count = gspca_dev->nframes;
1185 gspca_dev->capt_file = file;
1186 }
1187 out:
1188 mutex_unlock(&gspca_dev->queue_lock);
1189 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1190 return ret;
1191 }
1192
1193 static int vidioc_querybuf(struct file *file, void *priv,
1194 struct v4l2_buffer *v4l2_buf)
1195 {
1196 struct gspca_dev *gspca_dev = priv;
1197 struct gspca_frame *frame;
1198
1199 if (v4l2_buf->index < 0
1200 || v4l2_buf->index >= gspca_dev->nframes)
1201 return -EINVAL;
1202
1203 frame = &gspca_dev->frame[v4l2_buf->index];
1204 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1205 return 0;
1206 }
1207
1208 static int vidioc_streamon(struct file *file, void *priv,
1209 enum v4l2_buf_type buf_type)
1210 {
1211 struct gspca_dev *gspca_dev = priv;
1212 int ret;
1213
1214 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1215 return -EINVAL;
1216 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1217 return -ERESTARTSYS;
1218 if (!gspca_dev->present) {
1219 ret = -ENODEV;
1220 goto out;
1221 }
1222 if (gspca_dev->nframes == 0
1223 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1224 ret = -EINVAL;
1225 goto out;
1226 }
1227 if (!gspca_dev->streaming) {
1228 ret = gspca_init_transfer(gspca_dev);
1229 if (ret < 0)
1230 goto out;
1231 }
1232 #ifdef GSPCA_DEBUG
1233 if (gspca_debug & D_STREAM) {
1234 PDEBUG_MODE("stream on OK",
1235 gspca_dev->pixfmt,
1236 gspca_dev->width,
1237 gspca_dev->height);
1238 }
1239 #endif
1240 ret = 0;
1241 out:
1242 mutex_unlock(&gspca_dev->queue_lock);
1243 return ret;
1244 }
1245
1246 static int vidioc_streamoff(struct file *file, void *priv,
1247 enum v4l2_buf_type buf_type)
1248 {
1249 struct gspca_dev *gspca_dev = priv;
1250 int i, ret;
1251
1252 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1253 return -EINVAL;
1254 if (!gspca_dev->streaming)
1255 return 0;
1256 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1257 return -ERESTARTSYS;
1258
1259 /* stop streaming */
1260 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1261 ret = -ERESTARTSYS;
1262 goto out;
1263 }
1264 gspca_stream_off(gspca_dev);
1265 mutex_unlock(&gspca_dev->usb_lock);
1266
1267 /* empty the application queues */
1268 for (i = 0; i < gspca_dev->nframes; i++)
1269 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1270 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1271 gspca_dev->last_packet_type = DISCARD_PACKET;
1272 gspca_dev->sequence = 0;
1273 ret = 0;
1274 out:
1275 mutex_unlock(&gspca_dev->queue_lock);
1276 return ret;
1277 }
1278
1279 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1280 struct v4l2_jpegcompression *jpegcomp)
1281 {
1282 struct gspca_dev *gspca_dev = priv;
1283 int ret;
1284
1285 if (!gspca_dev->sd_desc->get_jcomp)
1286 return -EINVAL;
1287 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1288 return -ERESTARTSYS;
1289 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1290 mutex_unlock(&gspca_dev->usb_lock);
1291 return ret;
1292 }
1293
1294 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1295 struct v4l2_jpegcompression *jpegcomp)
1296 {
1297 struct gspca_dev *gspca_dev = priv;
1298 int ret;
1299
1300 if (!gspca_dev->sd_desc->set_jcomp)
1301 return -EINVAL;
1302 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1303 return -ERESTARTSYS;
1304 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1305 mutex_unlock(&gspca_dev->usb_lock);
1306 return ret;
1307 }
1308
1309 static int vidioc_g_parm(struct file *filp, void *priv,
1310 struct v4l2_streamparm *parm)
1311 {
1312 struct gspca_dev *gspca_dev = priv;
1313
1314 memset(parm, 0, sizeof *parm);
1315 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1316 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1317
1318 if (gspca_dev->sd_desc->get_streamparm) {
1319 int ret;
1320
1321 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1322 return -ERESTARTSYS;
1323 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1324 mutex_unlock(&gspca_dev->usb_lock);
1325 return ret;
1326 }
1327
1328 return 0;
1329 }
1330
1331 static int vidioc_s_parm(struct file *filp, void *priv,
1332 struct v4l2_streamparm *parm)
1333 {
1334 struct gspca_dev *gspca_dev = priv;
1335 int n;
1336
1337 n = parm->parm.capture.readbuffers;
1338 if (n == 0 || n > GSPCA_MAX_FRAMES)
1339 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1340 else
1341 gspca_dev->nbufread = n;
1342
1343 if (gspca_dev->sd_desc->set_streamparm) {
1344 int ret;
1345
1346 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1347 return -ERESTARTSYS;
1348 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1349 mutex_unlock(&gspca_dev->usb_lock);
1350 return ret;
1351 }
1352
1353 return 0;
1354 }
1355
1356 static int vidioc_s_std(struct file *filp, void *priv,
1357 v4l2_std_id *parm)
1358 {
1359 return 0;
1360 }
1361
1362 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1363 static int vidiocgmbuf(struct file *file, void *priv,
1364 struct video_mbuf *mbuf)
1365 {
1366 struct gspca_dev *gspca_dev = file->private_data;
1367 int i;
1368
1369 PDEBUG(D_STREAM, "cgmbuf");
1370 if (gspca_dev->nframes == 0) {
1371 int ret;
1372
1373 {
1374 struct v4l2_format fmt;
1375
1376 memset(&fmt, 0, sizeof fmt);
1377 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1378 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1379 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1380 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1381 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1382 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1383 if (ret != 0)
1384 return ret;
1385 }
1386 {
1387 struct v4l2_requestbuffers rb;
1388
1389 memset(&rb, 0, sizeof rb);
1390 rb.count = 4;
1391 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1392 rb.memory = V4L2_MEMORY_MMAP;
1393 ret = vidioc_reqbufs(file, priv, &rb);
1394 if (ret != 0)
1395 return ret;
1396 }
1397 }
1398 mbuf->frames = gspca_dev->nframes;
1399 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1400 for (i = 0; i < mbuf->frames; i++)
1401 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1402 return 0;
1403 }
1404 #endif
1405
1406 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1407 {
1408 struct gspca_dev *gspca_dev = file->private_data;
1409 struct gspca_frame *frame;
1410 struct page *page;
1411 unsigned long addr, start, size;
1412 int i, ret;
1413
1414 start = vma->vm_start;
1415 size = vma->vm_end - vma->vm_start;
1416 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1417
1418 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1419 return -ERESTARTSYS;
1420 if (!gspca_dev->present) {
1421 ret = -ENODEV;
1422 goto out;
1423 }
1424 if (gspca_dev->capt_file != file) {
1425 ret = -EINVAL;
1426 goto out;
1427 }
1428
1429 frame = NULL;
1430 for (i = 0; i < gspca_dev->nframes; ++i) {
1431 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1432 PDEBUG(D_STREAM, "mmap bad memory type");
1433 break;
1434 }
1435 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1436 == vma->vm_pgoff) {
1437 frame = &gspca_dev->frame[i];
1438 break;
1439 }
1440 }
1441 if (frame == NULL) {
1442 PDEBUG(D_STREAM, "mmap no frame buffer found");
1443 ret = -EINVAL;
1444 goto out;
1445 }
1446 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1447 /* v4l1 maps all the buffers */
1448 if (i != 0
1449 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1450 #endif
1451 if (size != frame->v4l2_buf.length) {
1452 PDEBUG(D_STREAM, "mmap bad size");
1453 ret = -EINVAL;
1454 goto out;
1455 }
1456
1457 /*
1458 * - VM_IO marks the area as being a mmaped region for I/O to a
1459 * device. It also prevents the region from being core dumped.
1460 */
1461 vma->vm_flags |= VM_IO;
1462
1463 addr = (unsigned long) frame->data;
1464 while (size > 0) {
1465 page = vmalloc_to_page((void *) addr);
1466 ret = vm_insert_page(vma, start, page);
1467 if (ret < 0)
1468 goto out;
1469 start += PAGE_SIZE;
1470 addr += PAGE_SIZE;
1471 size -= PAGE_SIZE;
1472 }
1473
1474 vma->vm_ops = &gspca_vm_ops;
1475 vma->vm_private_data = frame;
1476 gspca_vm_open(vma);
1477 ret = 0;
1478 out:
1479 mutex_unlock(&gspca_dev->queue_lock);
1480 return ret;
1481 }
1482
1483 /*
1484 * wait for a video frame
1485 *
1486 * If a frame is ready, its index is returned.
1487 */
1488 static int frame_wait(struct gspca_dev *gspca_dev,
1489 int nonblock_ing)
1490 {
1491 struct gspca_frame *frame;
1492 int i, j, ret;
1493
1494 /* check if a frame is ready */
1495 i = gspca_dev->fr_o;
1496 j = gspca_dev->fr_queue[i];
1497 frame = &gspca_dev->frame[j];
1498
1499 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1500 if (nonblock_ing)
1501 return -EAGAIN;
1502
1503 /* wait till a frame is ready */
1504 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1505 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1506 !gspca_dev->streaming || !gspca_dev->present,
1507 msecs_to_jiffies(3000));
1508 if (ret < 0)
1509 return ret;
1510 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1511 return -EIO;
1512 }
1513
1514 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1515 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1516 gspca_dev->fr_q,
1517 gspca_dev->fr_i,
1518 gspca_dev->fr_o);
1519
1520 if (gspca_dev->sd_desc->dq_callback) {
1521 mutex_lock(&gspca_dev->usb_lock);
1522 gspca_dev->sd_desc->dq_callback(gspca_dev);
1523 mutex_unlock(&gspca_dev->usb_lock);
1524 }
1525 return j;
1526 }
1527
1528 /*
1529 * dequeue a video buffer
1530 *
1531 * If nonblock_ing is false, block until a buffer is available.
1532 */
1533 static int vidioc_dqbuf(struct file *file, void *priv,
1534 struct v4l2_buffer *v4l2_buf)
1535 {
1536 struct gspca_dev *gspca_dev = priv;
1537 struct gspca_frame *frame;
1538 int i, ret;
1539
1540 PDEBUG(D_FRAM, "dqbuf");
1541 if (v4l2_buf->memory != gspca_dev->memory)
1542 return -EINVAL;
1543
1544 /* if not streaming, be sure the application will not loop forever */
1545 if (!(file->f_flags & O_NONBLOCK)
1546 && !gspca_dev->streaming && gspca_dev->users == 1)
1547 return -EINVAL;
1548
1549 /* only the capturing file may dequeue */
1550 if (gspca_dev->capt_file != file)
1551 return -EINVAL;
1552
1553 /* only one dequeue / read at a time */
1554 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1555 return -ERESTARTSYS;
1556
1557 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1558 if (ret < 0)
1559 goto out;
1560 i = ret; /* frame index */
1561 frame = &gspca_dev->frame[i];
1562 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1563 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1564 frame->data,
1565 frame->v4l2_buf.bytesused)) {
1566 PDEBUG(D_ERR|D_STREAM,
1567 "dqbuf cp to user failed");
1568 ret = -EFAULT;
1569 goto out;
1570 }
1571 }
1572 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1573 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1574 PDEBUG(D_FRAM, "dqbuf %d", i);
1575 ret = 0;
1576 out:
1577 mutex_unlock(&gspca_dev->read_lock);
1578 return ret;
1579 }
1580
1581 /*
1582 * queue a video buffer
1583 *
1584 * Attempting to queue a buffer that has already been
1585 * queued will return -EINVAL.
1586 */
1587 static int vidioc_qbuf(struct file *file, void *priv,
1588 struct v4l2_buffer *v4l2_buf)
1589 {
1590 struct gspca_dev *gspca_dev = priv;
1591 struct gspca_frame *frame;
1592 int i, index, ret;
1593
1594 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1595
1596 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1597 return -ERESTARTSYS;
1598
1599 index = v4l2_buf->index;
1600 if ((unsigned) index >= gspca_dev->nframes) {
1601 PDEBUG(D_FRAM,
1602 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1603 ret = -EINVAL;
1604 goto out;
1605 }
1606 if (v4l2_buf->memory != gspca_dev->memory) {
1607 PDEBUG(D_FRAM, "qbuf bad memory type");
1608 ret = -EINVAL;
1609 goto out;
1610 }
1611
1612 frame = &gspca_dev->frame[index];
1613 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1614 PDEBUG(D_FRAM, "qbuf bad state");
1615 ret = -EINVAL;
1616 goto out;
1617 }
1618
1619 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1620
1621 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1622 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1623 frame->v4l2_buf.length = v4l2_buf->length;
1624 }
1625
1626 /* put the buffer in the 'queued' queue */
1627 i = gspca_dev->fr_q;
1628 gspca_dev->fr_queue[i] = index;
1629 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1630 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1631 gspca_dev->fr_q,
1632 gspca_dev->fr_i,
1633 gspca_dev->fr_o);
1634
1635 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1636 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1637 ret = 0;
1638 out:
1639 mutex_unlock(&gspca_dev->queue_lock);
1640 return ret;
1641 }
1642
1643 /*
1644 * allocate the resources for read()
1645 */
1646 static int read_alloc(struct gspca_dev *gspca_dev,
1647 struct file *file)
1648 {
1649 struct v4l2_buffer v4l2_buf;
1650 int i, ret;
1651
1652 PDEBUG(D_STREAM, "read alloc");
1653 if (gspca_dev->nframes == 0) {
1654 struct v4l2_requestbuffers rb;
1655
1656 memset(&rb, 0, sizeof rb);
1657 rb.count = gspca_dev->nbufread;
1658 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1659 rb.memory = GSPCA_MEMORY_READ;
1660 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1661 if (ret != 0) {
1662 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1663 return ret;
1664 }
1665 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1666 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1667 v4l2_buf.memory = GSPCA_MEMORY_READ;
1668 for (i = 0; i < gspca_dev->nbufread; i++) {
1669 v4l2_buf.index = i;
1670 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1671 if (ret != 0) {
1672 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1673 return ret;
1674 }
1675 }
1676 gspca_dev->memory = GSPCA_MEMORY_READ;
1677 }
1678
1679 /* start streaming */
1680 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1681 if (ret != 0)
1682 PDEBUG(D_STREAM, "read streamon err %d", ret);
1683 return ret;
1684 }
1685
1686 static unsigned int dev_poll(struct file *file, poll_table *wait)
1687 {
1688 struct gspca_dev *gspca_dev = file->private_data;
1689 int i, ret;
1690
1691 PDEBUG(D_FRAM, "poll");
1692
1693 poll_wait(file, &gspca_dev->wq, wait);
1694 if (!gspca_dev->present)
1695 return POLLERR;
1696
1697 /* if reqbufs is not done, the user would use read() */
1698 if (gspca_dev->nframes == 0) {
1699 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1700 return POLLERR; /* not the 1st time */
1701 ret = read_alloc(gspca_dev, file);
1702 if (ret != 0)
1703 return POLLERR;
1704 }
1705
1706 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1707 return POLLERR;
1708 if (!gspca_dev->present) {
1709 ret = POLLERR;
1710 goto out;
1711 }
1712
1713 /* check the next incoming buffer */
1714 i = gspca_dev->fr_o;
1715 i = gspca_dev->fr_queue[i];
1716 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1717 ret = POLLIN | POLLRDNORM; /* something to read */
1718 else
1719 ret = 0;
1720 out:
1721 mutex_unlock(&gspca_dev->queue_lock);
1722 return ret;
1723 }
1724
1725 static ssize_t dev_read(struct file *file, char __user *data,
1726 size_t count, loff_t *ppos)
1727 {
1728 struct gspca_dev *gspca_dev = file->private_data;
1729 struct gspca_frame *frame;
1730 struct v4l2_buffer v4l2_buf;
1731 struct timeval timestamp;
1732 int n, ret, ret2;
1733
1734 PDEBUG(D_FRAM, "read (%zd)", count);
1735 if (!gspca_dev->present)
1736 return -ENODEV;
1737 switch (gspca_dev->memory) {
1738 case GSPCA_MEMORY_NO: /* first time */
1739 ret = read_alloc(gspca_dev, file);
1740 if (ret != 0)
1741 return ret;
1742 break;
1743 case GSPCA_MEMORY_READ:
1744 if (gspca_dev->capt_file == file)
1745 break;
1746 /* fall thru */
1747 default:
1748 return -EINVAL;
1749 }
1750
1751 /* get a frame */
1752 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1753 timestamp.tv_sec--;
1754 n = 2;
1755 for (;;) {
1756 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1757 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1758 v4l2_buf.memory = GSPCA_MEMORY_READ;
1759 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1760 if (ret != 0) {
1761 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1762 return ret;
1763 }
1764
1765 /* if the process slept for more than 1 second,
1766 * get a newer frame */
1767 frame = &gspca_dev->frame[v4l2_buf.index];
1768 if (--n < 0)
1769 break; /* avoid infinite loop */
1770 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1771 break;
1772 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1773 if (ret != 0) {
1774 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1775 return ret;
1776 }
1777 }
1778
1779 /* copy the frame */
1780 if (count > frame->v4l2_buf.bytesused)
1781 count = frame->v4l2_buf.bytesused;
1782 ret = copy_to_user(data, frame->data, count);
1783 if (ret != 0) {
1784 PDEBUG(D_ERR|D_STREAM,
1785 "read cp to user lack %d / %zd", ret, count);
1786 ret = -EFAULT;
1787 goto out;
1788 }
1789 ret = count;
1790 out:
1791 /* in each case, requeue the buffer */
1792 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1793 if (ret2 != 0)
1794 return ret2;
1795 return ret;
1796 }
1797
1798 static struct v4l2_file_operations dev_fops = {
1799 .owner = THIS_MODULE,
1800 .open = dev_open,
1801 .release = dev_close,
1802 .read = dev_read,
1803 .mmap = dev_mmap,
1804 .unlocked_ioctl = video_ioctl2,
1805 .poll = dev_poll,
1806 };
1807
1808 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1809 .vidioc_querycap = vidioc_querycap,
1810 .vidioc_dqbuf = vidioc_dqbuf,
1811 .vidioc_qbuf = vidioc_qbuf,
1812 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1813 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1814 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1815 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1816 .vidioc_streamon = vidioc_streamon,
1817 .vidioc_queryctrl = vidioc_queryctrl,
1818 .vidioc_g_ctrl = vidioc_g_ctrl,
1819 .vidioc_s_ctrl = vidioc_s_ctrl,
1820 .vidioc_g_audio = vidioc_g_audio,
1821 .vidioc_s_audio = vidioc_s_audio,
1822 .vidioc_enumaudio = vidioc_enumaudio,
1823 .vidioc_querymenu = vidioc_querymenu,
1824 .vidioc_enum_input = vidioc_enum_input,
1825 .vidioc_g_input = vidioc_g_input,
1826 .vidioc_s_input = vidioc_s_input,
1827 .vidioc_reqbufs = vidioc_reqbufs,
1828 .vidioc_querybuf = vidioc_querybuf,
1829 .vidioc_streamoff = vidioc_streamoff,
1830 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1831 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1832 .vidioc_g_parm = vidioc_g_parm,
1833 .vidioc_s_parm = vidioc_s_parm,
1834 .vidioc_s_std = vidioc_s_std,
1835 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1836 .vidiocgmbuf = vidiocgmbuf,
1837 #endif
1838 };
1839
1840 static struct video_device gspca_template = {
1841 .name = "gspca main driver",
1842 .fops = &dev_fops,
1843 .ioctl_ops = &dev_ioctl_ops,
1844 .release = gspca_release,
1845 .minor = -1,
1846 };
1847
1848 /*
1849 * probe and create a new gspca device
1850 *
1851 * This function must be called by the sub-driver when it is
1852 * called for probing a new device.
1853 */
1854 int gspca_dev_probe(struct usb_interface *intf,
1855 const struct usb_device_id *id,
1856 const struct sd_desc *sd_desc,
1857 int dev_size,
1858 struct module *module)
1859 {
1860 struct usb_interface_descriptor *interface;
1861 struct gspca_dev *gspca_dev;
1862 struct usb_device *dev = interface_to_usbdev(intf);
1863 int ret;
1864
1865 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1866
1867 /* we don't handle multi-config cameras */
1868 if (dev->descriptor.bNumConfigurations != 1)
1869 return -ENODEV;
1870 interface = &intf->cur_altsetting->desc;
1871 if (interface->bInterfaceNumber > 0)
1872 return -ENODEV;
1873
1874 /* create the device */
1875 if (dev_size < sizeof *gspca_dev)
1876 dev_size = sizeof *gspca_dev;
1877 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1878 if (!gspca_dev) {
1879 err("couldn't kzalloc gspca struct");
1880 return -ENOMEM;
1881 }
1882 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1883 if (!gspca_dev->usb_buf) {
1884 err("out of memory");
1885 ret = -ENOMEM;
1886 goto out;
1887 }
1888 gspca_dev->dev = dev;
1889 gspca_dev->iface = interface->bInterfaceNumber;
1890 gspca_dev->nbalt = intf->num_altsetting;
1891 gspca_dev->sd_desc = sd_desc;
1892 gspca_dev->nbufread = 2;
1893 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1894
1895 /* configure the subdriver and initialize the USB device */
1896 ret = sd_desc->config(gspca_dev, id);
1897 if (ret < 0)
1898 goto out;
1899 ret = sd_desc->init(gspca_dev);
1900 if (ret < 0)
1901 goto out;
1902 ret = gspca_set_alt0(gspca_dev);
1903 if (ret < 0)
1904 goto out;
1905 gspca_set_default_mode(gspca_dev);
1906
1907 mutex_init(&gspca_dev->usb_lock);
1908 mutex_init(&gspca_dev->read_lock);
1909 mutex_init(&gspca_dev->queue_lock);
1910 init_waitqueue_head(&gspca_dev->wq);
1911
1912 /* init video stuff */
1913 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1914 gspca_dev->vdev.parent = &dev->dev;
1915 gspca_dev->module = module;
1916 gspca_dev->present = 1;
1917 ret = video_register_device(&gspca_dev->vdev,
1918 VFL_TYPE_GRABBER,
1919 -1);
1920 if (ret < 0) {
1921 err("video_register_device err %d", ret);
1922 goto out;
1923 }
1924
1925 usb_set_intfdata(intf, gspca_dev);
1926 PDEBUG(D_PROBE, "probe ok");
1927 return 0;
1928 out:
1929 kfree(gspca_dev->usb_buf);
1930 kfree(gspca_dev);
1931 return ret;
1932 }
1933 EXPORT_SYMBOL(gspca_dev_probe);
1934
1935 /*
1936 * USB disconnection
1937 *
1938 * This function must be called by the sub-driver
1939 * when the device disconnects, after the specific resources are freed.
1940 */
1941 void gspca_disconnect(struct usb_interface *intf)
1942 {
1943 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1944
1945 mutex_lock(&gspca_dev->usb_lock);
1946 gspca_dev->present = 0;
1947 mutex_unlock(&gspca_dev->usb_lock);
1948
1949 destroy_urbs(gspca_dev);
1950 gspca_dev->dev = NULL;
1951 usb_set_intfdata(intf, NULL);
1952
1953 /* release the device */
1954 /* (this will call gspca_release() immediatly or on last close) */
1955 video_unregister_device(&gspca_dev->vdev);
1956
1957 PDEBUG(D_PROBE, "disconnect complete");
1958 }
1959 EXPORT_SYMBOL(gspca_disconnect);
1960
1961 #ifdef CONFIG_PM
1962 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1963 {
1964 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1965
1966 if (!gspca_dev->streaming)
1967 return 0;
1968 gspca_dev->frozen = 1; /* avoid urb error messages */
1969 if (gspca_dev->sd_desc->stopN)
1970 gspca_dev->sd_desc->stopN(gspca_dev);
1971 destroy_urbs(gspca_dev);
1972 gspca_set_alt0(gspca_dev);
1973 if (gspca_dev->sd_desc->stop0)
1974 gspca_dev->sd_desc->stop0(gspca_dev);
1975 return 0;
1976 }
1977 EXPORT_SYMBOL(gspca_suspend);
1978
1979 int gspca_resume(struct usb_interface *intf)
1980 {
1981 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1982
1983 gspca_dev->frozen = 0;
1984 gspca_dev->sd_desc->init(gspca_dev);
1985 if (gspca_dev->streaming)
1986 return gspca_init_transfer(gspca_dev);
1987 return 0;
1988 }
1989 EXPORT_SYMBOL(gspca_resume);
1990 #endif
1991 /* -- cam driver utility functions -- */
1992
1993 /* auto gain and exposure algorithm based on the knee algorithm described here:
1994 http://ytse.tricolour.net/docs/LowLightOptimization.html
1995
1996 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1997 where changed. */
1998 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1999 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2000 {
2001 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2002 const struct ctrl *gain_ctrl = NULL;
2003 const struct ctrl *exposure_ctrl = NULL;
2004 const struct ctrl *autogain_ctrl = NULL;
2005 int retval = 0;
2006
2007 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2008 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2009 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2010 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2011 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2012 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2013 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014 }
2015 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2016 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2017 "on cam without (auto)gain/exposure");
2018 return 0;
2019 }
2020
2021 if (gain_ctrl->get(gspca_dev, &gain) ||
2022 exposure_ctrl->get(gspca_dev, &exposure) ||
2023 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2024 return 0;
2025
2026 orig_gain = gain;
2027 orig_exposure = exposure;
2028
2029 /* If we are of a multiple of deadzone, do multiple steps to reach the
2030 desired lumination fast (with the risc of a slight overshoot) */
2031 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2032
2033 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2034 avg_lum, desired_avg_lum, steps);
2035
2036 for (i = 0; i < steps; i++) {
2037 if (avg_lum > desired_avg_lum) {
2038 if (gain > gain_knee)
2039 gain--;
2040 else if (exposure > exposure_knee)
2041 exposure--;
2042 else if (gain > gain_ctrl->qctrl.default_value)
2043 gain--;
2044 else if (exposure > exposure_ctrl->qctrl.minimum)
2045 exposure--;
2046 else if (gain > gain_ctrl->qctrl.minimum)
2047 gain--;
2048 else
2049 break;
2050 } else {
2051 if (gain < gain_ctrl->qctrl.default_value)
2052 gain++;
2053 else if (exposure < exposure_knee)
2054 exposure++;
2055 else if (gain < gain_knee)
2056 gain++;
2057 else if (exposure < exposure_ctrl->qctrl.maximum)
2058 exposure++;
2059 else if (gain < gain_ctrl->qctrl.maximum)
2060 gain++;
2061 else
2062 break;
2063 }
2064 }
2065
2066 if (gain != orig_gain) {
2067 gain_ctrl->set(gspca_dev, gain);
2068 retval = 1;
2069 }
2070 if (exposure != orig_exposure) {
2071 exposure_ctrl->set(gspca_dev, exposure);
2072 retval = 1;
2073 }
2074
2075 return retval;
2076 }
2077 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2078
2079 /* -- module insert / remove -- */
2080 static int __init gspca_init(void)
2081 {
2082 info("main v%d.%d.%d registered",
2083 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2084 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2085 DRIVER_VERSION_NUMBER & 0xff);
2086 return 0;
2087 }
2088 static void __exit gspca_exit(void)
2089 {
2090 info("main deregistered");
2091 }
2092
2093 module_init(gspca_init);
2094 module_exit(gspca_exit);
2095
2096 #ifdef GSPCA_DEBUG
2097 module_param_named(debug, gspca_debug, int, 0644);
2098 MODULE_PARM_DESC(debug,
2099 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2100 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2101 " 0x0100: v4l2");
2102 #endif
(deprecated) Btrfs devel tree