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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[mirror_ubuntu-artful-kernel.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 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 if (urb->status == -ESHUTDOWN)
136 return; /* disconnection */
137 #ifdef CONFIG_PM
138 if (!gspca_dev->frozen)
139 #endif
140 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
141 return;
142 }
143 pkt_scan = gspca_dev->sd_desc->pkt_scan;
144 for (i = 0; i < urb->number_of_packets; i++) {
145
146 /* check the availability of the frame buffer */
147 frame = gspca_get_i_frame(gspca_dev);
148 if (!frame) {
149 gspca_dev->last_packet_type = DISCARD_PACKET;
150 break;
151 }
152
153 /* check the packet status and length */
154 len = urb->iso_frame_desc[i].actual_length;
155 if (len == 0) {
156 if (gspca_dev->empty_packet == 0)
157 gspca_dev->empty_packet = 1;
158 continue;
159 }
160 st = urb->iso_frame_desc[i].status;
161 if (st) {
162 PDEBUG(D_ERR,
163 "ISOC data error: [%d] len=%d, status=%d",
164 i, len, st);
165 gspca_dev->last_packet_type = DISCARD_PACKET;
166 continue;
167 }
168
169 /* let the packet be analyzed by the subdriver */
170 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
171 i, urb->iso_frame_desc[i].offset, len);
172 data = (u8 *) urb->transfer_buffer
173 + urb->iso_frame_desc[i].offset;
174 pkt_scan(gspca_dev, frame, data, len);
175 }
176
177 /* resubmit the URB */
178 st = usb_submit_urb(urb, GFP_ATOMIC);
179 if (st < 0)
180 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
181 }
182
183 /*
184 * ISOC message interrupt from the USB device
185 *
186 * Analyse each packet and call the subdriver for copy to the frame buffer.
187 */
188 static void isoc_irq(struct urb *urb)
189 {
190 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
191
192 PDEBUG(D_PACK, "isoc irq");
193 if (!gspca_dev->streaming)
194 return;
195 fill_frame(gspca_dev, urb);
196 }
197
198 /*
199 * bulk message interrupt from the USB device
200 */
201 static void bulk_irq(struct urb *urb)
202 {
203 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
204 struct gspca_frame *frame;
205 int st;
206
207 PDEBUG(D_PACK, "bulk irq");
208 if (!gspca_dev->streaming)
209 return;
210 switch (urb->status) {
211 case 0:
212 break;
213 case -ESHUTDOWN:
214 return; /* disconnection */
215 case -ECONNRESET:
216 urb->status = 0;
217 break;
218 default:
219 #ifdef CONFIG_PM
220 if (!gspca_dev->frozen)
221 #endif
222 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
223 return;
224 }
225
226 /* check the availability of the frame buffer */
227 frame = gspca_get_i_frame(gspca_dev);
228 if (!frame) {
229 gspca_dev->last_packet_type = DISCARD_PACKET;
230 } else {
231 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
232 gspca_dev->sd_desc->pkt_scan(gspca_dev,
233 frame,
234 urb->transfer_buffer,
235 urb->actual_length);
236 }
237
238 /* resubmit the URB */
239 if (gspca_dev->cam.bulk_nurbs != 0) {
240 st = usb_submit_urb(urb, GFP_ATOMIC);
241 if (st < 0)
242 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
243 }
244 }
245
246 /*
247 * add data to the current frame
248 *
249 * This function is called by the subdrivers at interrupt level.
250 *
251 * To build a frame, these ones must add
252 * - one FIRST_PACKET
253 * - 0 or many INTER_PACKETs
254 * - one LAST_PACKET
255 * DISCARD_PACKET invalidates the whole frame.
256 * On LAST_PACKET, a new frame is returned.
257 */
258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
259 enum gspca_packet_type packet_type,
260 struct gspca_frame *frame,
261 const __u8 *data,
262 int len)
263 {
264 int i, j;
265
266 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
267
268 /* when start of a new frame, if the current frame buffer
269 * is not queued, discard the whole frame */
270 if (packet_type == FIRST_PACKET) {
271 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
272 != V4L2_BUF_FLAG_QUEUED) {
273 gspca_dev->last_packet_type = DISCARD_PACKET;
274 return frame;
275 }
276 frame->data_end = frame->data;
277 jiffies_to_timeval(get_jiffies_64(),
278 &frame->v4l2_buf.timestamp);
279 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
280 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
281 if (packet_type == LAST_PACKET)
282 gspca_dev->last_packet_type = packet_type;
283 return frame;
284 }
285
286 /* append the packet to the frame buffer */
287 if (len > 0) {
288 if (frame->data_end - frame->data + len
289 > frame->v4l2_buf.length) {
290 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
291 frame->data_end - frame->data + len,
292 frame->v4l2_buf.length);
293 packet_type = DISCARD_PACKET;
294 } else {
295 memcpy(frame->data_end, data, len);
296 frame->data_end += len;
297 }
298 }
299 gspca_dev->last_packet_type = packet_type;
300
301 /* if last packet, wake up the application and advance in the queue */
302 if (packet_type == LAST_PACKET) {
303 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
304 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
305 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
306 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
307 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
308 gspca_dev->fr_i = i;
309 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
310 frame->v4l2_buf.bytesused,
311 gspca_dev->fr_q,
312 i,
313 gspca_dev->fr_o);
314 j = gspca_dev->fr_queue[i];
315 frame = &gspca_dev->frame[j];
316 }
317 return frame;
318 }
319 EXPORT_SYMBOL(gspca_frame_add);
320
321 static int gspca_is_compressed(__u32 format)
322 {
323 switch (format) {
324 case V4L2_PIX_FMT_MJPEG:
325 case V4L2_PIX_FMT_JPEG:
326 case V4L2_PIX_FMT_SPCA561:
327 case V4L2_PIX_FMT_PAC207:
328 case V4L2_PIX_FMT_MR97310A:
329 return 1;
330 }
331 return 0;
332 }
333
334 static void *rvmalloc(unsigned long size)
335 {
336 void *mem;
337 unsigned long adr;
338
339 mem = vmalloc_32(size);
340 if (mem != NULL) {
341 adr = (unsigned long) mem;
342 while ((long) size > 0) {
343 SetPageReserved(vmalloc_to_page((void *) adr));
344 adr += PAGE_SIZE;
345 size -= PAGE_SIZE;
346 }
347 }
348 return mem;
349 }
350
351 static void rvfree(void *mem, long size)
352 {
353 unsigned long adr;
354
355 adr = (unsigned long) mem;
356 while (size > 0) {
357 ClearPageReserved(vmalloc_to_page((void *) adr));
358 adr += PAGE_SIZE;
359 size -= PAGE_SIZE;
360 }
361 vfree(mem);
362 }
363
364 static int frame_alloc(struct gspca_dev *gspca_dev,
365 unsigned int count)
366 {
367 struct gspca_frame *frame;
368 unsigned int frsz;
369 int i;
370
371 i = gspca_dev->curr_mode;
372 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
373 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
374 frsz = PAGE_ALIGN(frsz);
375 gspca_dev->frsz = frsz;
376 if (count > GSPCA_MAX_FRAMES)
377 count = GSPCA_MAX_FRAMES;
378 gspca_dev->frbuf = rvmalloc(frsz * count);
379 if (!gspca_dev->frbuf) {
380 err("frame alloc failed");
381 return -ENOMEM;
382 }
383 gspca_dev->nframes = count;
384 for (i = 0; i < count; i++) {
385 frame = &gspca_dev->frame[i];
386 frame->v4l2_buf.index = i;
387 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
388 frame->v4l2_buf.flags = 0;
389 frame->v4l2_buf.field = V4L2_FIELD_NONE;
390 frame->v4l2_buf.length = frsz;
391 frame->v4l2_buf.memory = gspca_dev->memory;
392 frame->v4l2_buf.sequence = 0;
393 frame->data = frame->data_end =
394 gspca_dev->frbuf + i * frsz;
395 frame->v4l2_buf.m.offset = i * frsz;
396 }
397 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
398 gspca_dev->last_packet_type = DISCARD_PACKET;
399 gspca_dev->sequence = 0;
400 return 0;
401 }
402
403 static void frame_free(struct gspca_dev *gspca_dev)
404 {
405 int i;
406
407 PDEBUG(D_STREAM, "frame free");
408 if (gspca_dev->frbuf != NULL) {
409 rvfree(gspca_dev->frbuf,
410 gspca_dev->nframes * gspca_dev->frsz);
411 gspca_dev->frbuf = NULL;
412 for (i = 0; i < gspca_dev->nframes; i++)
413 gspca_dev->frame[i].data = NULL;
414 }
415 gspca_dev->nframes = 0;
416 }
417
418 static void destroy_urbs(struct gspca_dev *gspca_dev)
419 {
420 struct urb *urb;
421 unsigned int i;
422
423 PDEBUG(D_STREAM, "kill transfer");
424 for (i = 0; i < MAX_NURBS; i++) {
425 urb = gspca_dev->urb[i];
426 if (urb == NULL)
427 break;
428
429 gspca_dev->urb[i] = NULL;
430 usb_kill_urb(urb);
431 if (urb->transfer_buffer != NULL)
432 usb_buffer_free(gspca_dev->dev,
433 urb->transfer_buffer_length,
434 urb->transfer_buffer,
435 urb->transfer_dma);
436 usb_free_urb(urb);
437 }
438 }
439
440 /*
441 * look for an input transfer endpoint in an alternate setting
442 */
443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
444 __u8 xfer)
445 {
446 struct usb_host_endpoint *ep;
447 int i, attr;
448
449 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
450 ep = &alt->endpoint[i];
451 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
452 if (attr == xfer)
453 return ep;
454 }
455 return NULL;
456 }
457
458 /*
459 * look for an input (isoc or bulk) endpoint
460 *
461 * The endpoint is defined by the subdriver.
462 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
463 * This routine may be called many times when the bandwidth is too small
464 * (the bandwidth is checked on urb submit).
465 */
466 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
467 {
468 struct usb_interface *intf;
469 struct usb_host_endpoint *ep;
470 int i, ret;
471
472 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
473 ep = NULL;
474 i = gspca_dev->alt; /* previous alt setting */
475
476 /* try isoc */
477 while (--i >= 0) {
478 ep = alt_xfer(&intf->altsetting[i],
479 USB_ENDPOINT_XFER_ISOC);
480 if (ep)
481 break;
482 }
483
484 /* if no isoc, try bulk (alt 0 only) */
485 if (ep == NULL) {
486 ep = alt_xfer(&intf->altsetting[0],
487 USB_ENDPOINT_XFER_BULK);
488 if (ep == NULL) {
489 err("no transfer endpoint found");
490 return NULL;
491 }
492 i = 0;
493 gspca_dev->bulk = 1;
494 }
495 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
496 i, ep->desc.bEndpointAddress);
497 if (i > 0) {
498 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
499 if (ret < 0) {
500 err("set interface err %d", ret);
501 return NULL;
502 }
503 }
504 gspca_dev->alt = i; /* memorize the current alt setting */
505 return ep;
506 }
507
508 /*
509 * create the URBs for image transfer
510 */
511 static int create_urbs(struct gspca_dev *gspca_dev,
512 struct usb_host_endpoint *ep)
513 {
514 struct urb *urb;
515 int n, nurbs, i, psize, npkt, bsize;
516
517 /* calculate the packet size and the number of packets */
518 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
519
520 if (!gspca_dev->bulk) { /* isoc */
521
522 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
523 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
524 npkt = ISO_MAX_SIZE / psize;
525 if (npkt > ISO_MAX_PKT)
526 npkt = ISO_MAX_PKT;
527 bsize = psize * npkt;
528 PDEBUG(D_STREAM,
529 "isoc %d pkts size %d = bsize:%d",
530 npkt, psize, bsize);
531 nurbs = DEF_NURBS;
532 } else { /* bulk */
533 npkt = 0;
534 bsize = gspca_dev->cam.bulk_size;
535 if (bsize == 0)
536 bsize = psize;
537 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
538 if (gspca_dev->cam.bulk_nurbs != 0)
539 nurbs = gspca_dev->cam.bulk_nurbs;
540 else
541 nurbs = 1;
542 }
543
544 gspca_dev->nurbs = nurbs;
545 for (n = 0; n < nurbs; n++) {
546 urb = usb_alloc_urb(npkt, GFP_KERNEL);
547 if (!urb) {
548 err("usb_alloc_urb failed");
549 destroy_urbs(gspca_dev);
550 return -ENOMEM;
551 }
552 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
553 bsize,
554 GFP_KERNEL,
555 &urb->transfer_dma);
556
557 if (urb->transfer_buffer == NULL) {
558 usb_free_urb(urb);
559 err("usb_buffer_urb failed");
560 destroy_urbs(gspca_dev);
561 return -ENOMEM;
562 }
563 gspca_dev->urb[n] = urb;
564 urb->dev = gspca_dev->dev;
565 urb->context = gspca_dev;
566 urb->transfer_buffer_length = bsize;
567 if (npkt != 0) { /* ISOC */
568 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
569 ep->desc.bEndpointAddress);
570 urb->transfer_flags = URB_ISO_ASAP
571 | URB_NO_TRANSFER_DMA_MAP;
572 urb->interval = ep->desc.bInterval;
573 urb->complete = isoc_irq;
574 urb->number_of_packets = npkt;
575 for (i = 0; i < npkt; i++) {
576 urb->iso_frame_desc[i].length = psize;
577 urb->iso_frame_desc[i].offset = psize * i;
578 }
579 } else { /* bulk */
580 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
581 ep->desc.bEndpointAddress),
582 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
583 urb->complete = bulk_irq;
584 }
585 }
586 return 0;
587 }
588
589 /*
590 * start the USB transfer
591 */
592 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
593 {
594 struct usb_host_endpoint *ep;
595 int n, ret;
596
597 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
598 return -ERESTARTSYS;
599
600 if (!gspca_dev->present) {
601 ret = -ENODEV;
602 goto out;
603 }
604
605 /* set the higher alternate setting and
606 * loop until urb submit succeeds */
607 gspca_dev->alt = gspca_dev->nbalt;
608 for (;;) {
609 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
610 ep = get_ep(gspca_dev);
611 if (ep == NULL) {
612 ret = -EIO;
613 goto out;
614 }
615 ret = create_urbs(gspca_dev, ep);
616 if (ret < 0)
617 goto out;
618
619 /* clear the bulk endpoint */
620 if (gspca_dev->bulk)
621 usb_clear_halt(gspca_dev->dev,
622 gspca_dev->urb[0]->pipe);
623
624 /* start the cam */
625 ret = gspca_dev->sd_desc->start(gspca_dev);
626 if (ret < 0) {
627 destroy_urbs(gspca_dev);
628 goto out;
629 }
630 gspca_dev->streaming = 1;
631
632 /* some bulk transfers are started by the subdriver */
633 if (gspca_dev->bulk && gspca_dev->cam.bulk_nurbs == 0)
634 break;
635
636 /* submit the URBs */
637 for (n = 0; n < gspca_dev->nurbs; n++) {
638 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
639 if (ret < 0) {
640 PDEBUG(D_ERR|D_STREAM,
641 "usb_submit_urb [%d] err %d", n, ret);
642 gspca_dev->streaming = 0;
643 destroy_urbs(gspca_dev);
644 if (ret == -ENOSPC) {
645 msleep(20); /* wait for kill
646 * complete */
647 break; /* try the previous alt */
648 }
649 goto out;
650 }
651 }
652 if (ret >= 0)
653 break;
654 }
655 out:
656 mutex_unlock(&gspca_dev->usb_lock);
657 return ret;
658 }
659
660 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
661 {
662 int ret;
663
664 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
665 if (ret < 0)
666 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
667 return ret;
668 }
669
670 /* Note: both the queue and the usb locks should be held when calling this */
671 static void gspca_stream_off(struct gspca_dev *gspca_dev)
672 {
673 gspca_dev->streaming = 0;
674 if (gspca_dev->present) {
675 if (gspca_dev->sd_desc->stopN)
676 gspca_dev->sd_desc->stopN(gspca_dev);
677 destroy_urbs(gspca_dev);
678 gspca_set_alt0(gspca_dev);
679 }
680
681 /* always call stop0 to free the subdriver's resources */
682 if (gspca_dev->sd_desc->stop0)
683 gspca_dev->sd_desc->stop0(gspca_dev);
684 PDEBUG(D_STREAM, "stream off OK");
685 }
686
687 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
688 {
689 int i;
690
691 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
692 gspca_dev->curr_mode = i;
693 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
694 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
695 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
696 }
697
698 static int wxh_to_mode(struct gspca_dev *gspca_dev,
699 int width, int height)
700 {
701 int i;
702
703 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
704 if (width >= gspca_dev->cam.cam_mode[i].width
705 && height >= gspca_dev->cam.cam_mode[i].height)
706 break;
707 }
708 return i;
709 }
710
711 /*
712 * search a mode with the right pixel format
713 */
714 static int gspca_get_mode(struct gspca_dev *gspca_dev,
715 int mode,
716 int pixfmt)
717 {
718 int modeU, modeD;
719
720 modeU = modeD = mode;
721 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
722 if (--modeD >= 0) {
723 if (gspca_dev->cam.cam_mode[modeD].pixelformat
724 == pixfmt)
725 return modeD;
726 }
727 if (++modeU < gspca_dev->cam.nmodes) {
728 if (gspca_dev->cam.cam_mode[modeU].pixelformat
729 == pixfmt)
730 return modeU;
731 }
732 }
733 return -EINVAL;
734 }
735
736 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
737 struct v4l2_fmtdesc *fmtdesc)
738 {
739 struct gspca_dev *gspca_dev = priv;
740 int i, j, index;
741 __u32 fmt_tb[8];
742
743 /* give an index to each format */
744 index = 0;
745 j = 0;
746 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
747 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
748 j = 0;
749 for (;;) {
750 if (fmt_tb[j] == fmt_tb[index])
751 break;
752 j++;
753 }
754 if (j == index) {
755 if (fmtdesc->index == index)
756 break; /* new format */
757 index++;
758 if (index >= ARRAY_SIZE(fmt_tb))
759 return -EINVAL;
760 }
761 }
762 if (i < 0)
763 return -EINVAL; /* no more format */
764
765 fmtdesc->pixelformat = fmt_tb[index];
766 if (gspca_is_compressed(fmt_tb[index]))
767 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
768 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
769 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
770 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
771 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
772 fmtdesc->description[4] = '\0';
773 return 0;
774 }
775
776 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
777 struct v4l2_format *fmt)
778 {
779 struct gspca_dev *gspca_dev = priv;
780 int mode;
781
782 mode = gspca_dev->curr_mode;
783 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
784 sizeof fmt->fmt.pix);
785 return 0;
786 }
787
788 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
789 struct v4l2_format *fmt)
790 {
791 int w, h, mode, mode2;
792
793 w = fmt->fmt.pix.width;
794 h = fmt->fmt.pix.height;
795
796 #ifdef GSPCA_DEBUG
797 if (gspca_debug & D_CONF)
798 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
799 #endif
800 /* search the closest mode for width and height */
801 mode = wxh_to_mode(gspca_dev, w, h);
802
803 /* OK if right palette */
804 if (gspca_dev->cam.cam_mode[mode].pixelformat
805 != fmt->fmt.pix.pixelformat) {
806
807 /* else, search the closest mode with the same pixel format */
808 mode2 = gspca_get_mode(gspca_dev, mode,
809 fmt->fmt.pix.pixelformat);
810 if (mode2 >= 0)
811 mode = mode2;
812 /* else
813 ; * no chance, return this mode */
814 }
815 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
816 sizeof fmt->fmt.pix);
817 return mode; /* used when s_fmt */
818 }
819
820 static int vidioc_try_fmt_vid_cap(struct file *file,
821 void *priv,
822 struct v4l2_format *fmt)
823 {
824 struct gspca_dev *gspca_dev = priv;
825 int ret;
826
827 ret = try_fmt_vid_cap(gspca_dev, fmt);
828 if (ret < 0)
829 return ret;
830 return 0;
831 }
832
833 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
834 struct v4l2_format *fmt)
835 {
836 struct gspca_dev *gspca_dev = priv;
837 int ret;
838
839 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
840 return -ERESTARTSYS;
841
842 ret = try_fmt_vid_cap(gspca_dev, fmt);
843 if (ret < 0)
844 goto out;
845
846 if (gspca_dev->nframes != 0
847 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
848 ret = -EINVAL;
849 goto out;
850 }
851
852 if (ret == gspca_dev->curr_mode) {
853 ret = 0;
854 goto out; /* same mode */
855 }
856
857 if (gspca_dev->streaming) {
858 ret = -EBUSY;
859 goto out;
860 }
861 gspca_dev->width = fmt->fmt.pix.width;
862 gspca_dev->height = fmt->fmt.pix.height;
863 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
864 gspca_dev->curr_mode = ret;
865
866 ret = 0;
867 out:
868 mutex_unlock(&gspca_dev->queue_lock);
869 return ret;
870 }
871
872 static void gspca_release(struct video_device *vfd)
873 {
874 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
875
876 PDEBUG(D_STREAM, "device released");
877
878 kfree(gspca_dev->usb_buf);
879 kfree(gspca_dev);
880 }
881
882 static int dev_open(struct file *file)
883 {
884 struct gspca_dev *gspca_dev;
885 int ret;
886
887 PDEBUG(D_STREAM, "%s open", current->comm);
888 gspca_dev = (struct gspca_dev *) video_devdata(file);
889 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
890 return -ERESTARTSYS;
891 if (!gspca_dev->present) {
892 ret = -ENODEV;
893 goto out;
894 }
895
896 if (gspca_dev->users > 4) { /* (arbitrary value) */
897 ret = -EBUSY;
898 goto out;
899 }
900
901 /* protect the subdriver against rmmod */
902 if (!try_module_get(gspca_dev->module)) {
903 ret = -ENODEV;
904 goto out;
905 }
906
907 gspca_dev->users++;
908
909 file->private_data = gspca_dev;
910 #ifdef GSPCA_DEBUG
911 /* activate the v4l2 debug */
912 if (gspca_debug & D_V4L2)
913 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
914 | V4L2_DEBUG_IOCTL_ARG;
915 else
916 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
917 | V4L2_DEBUG_IOCTL_ARG);
918 #endif
919 ret = 0;
920 out:
921 mutex_unlock(&gspca_dev->queue_lock);
922 if (ret != 0)
923 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
924 else
925 PDEBUG(D_STREAM, "open done");
926 return ret;
927 }
928
929 static int dev_close(struct file *file)
930 {
931 struct gspca_dev *gspca_dev = file->private_data;
932
933 PDEBUG(D_STREAM, "%s close", current->comm);
934 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
935 return -ERESTARTSYS;
936 gspca_dev->users--;
937
938 /* if the file did the capture, free the streaming resources */
939 if (gspca_dev->capt_file == file) {
940 if (gspca_dev->streaming) {
941 mutex_lock(&gspca_dev->usb_lock);
942 gspca_stream_off(gspca_dev);
943 mutex_unlock(&gspca_dev->usb_lock);
944 }
945 frame_free(gspca_dev);
946 gspca_dev->capt_file = NULL;
947 gspca_dev->memory = GSPCA_MEMORY_NO;
948 }
949 file->private_data = NULL;
950 module_put(gspca_dev->module);
951 mutex_unlock(&gspca_dev->queue_lock);
952
953 PDEBUG(D_STREAM, "close done");
954
955 return 0;
956 }
957
958 static int vidioc_querycap(struct file *file, void *priv,
959 struct v4l2_capability *cap)
960 {
961 struct gspca_dev *gspca_dev = priv;
962 int ret;
963
964 /* protect the access to the usb device */
965 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
966 return -ERESTARTSYS;
967 if (!gspca_dev->present) {
968 ret = -ENODEV;
969 goto out;
970 }
971 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
972 if (gspca_dev->dev->product != NULL) {
973 strncpy(cap->card, gspca_dev->dev->product,
974 sizeof cap->card);
975 } else {
976 snprintf(cap->card, sizeof cap->card,
977 "USB Camera (%04x:%04x)",
978 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
979 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
980 }
981 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
982 cap->version = DRIVER_VERSION_NUMBER;
983 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
984 | V4L2_CAP_STREAMING
985 | V4L2_CAP_READWRITE;
986 ret = 0;
987 out:
988 mutex_unlock(&gspca_dev->usb_lock);
989 return ret;
990 }
991
992 static int vidioc_queryctrl(struct file *file, void *priv,
993 struct v4l2_queryctrl *q_ctrl)
994 {
995 struct gspca_dev *gspca_dev = priv;
996 int i, ix;
997 u32 id;
998
999 ix = -1;
1000 id = q_ctrl->id;
1001 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1002 id &= V4L2_CTRL_ID_MASK;
1003 id++;
1004 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1005 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1006 continue;
1007 if (ix < 0) {
1008 ix = i;
1009 continue;
1010 }
1011 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1012 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1013 continue;
1014 ix = i;
1015 }
1016 }
1017 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1018 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1019 ix = i;
1020 break;
1021 }
1022 }
1023 if (ix < 0)
1024 return -EINVAL;
1025 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1026 sizeof *q_ctrl);
1027 if (gspca_dev->ctrl_dis & (1 << ix))
1028 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1029 return 0;
1030 }
1031
1032 static int vidioc_s_ctrl(struct file *file, void *priv,
1033 struct v4l2_control *ctrl)
1034 {
1035 struct gspca_dev *gspca_dev = priv;
1036 const struct ctrl *ctrls;
1037 int i, ret;
1038
1039 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1040 i < gspca_dev->sd_desc->nctrls;
1041 i++, ctrls++) {
1042 if (ctrl->id != ctrls->qctrl.id)
1043 continue;
1044 if (gspca_dev->ctrl_dis & (1 << i))
1045 return -EINVAL;
1046 if (ctrl->value < ctrls->qctrl.minimum
1047 || ctrl->value > ctrls->qctrl.maximum)
1048 return -ERANGE;
1049 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1050 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1051 return -ERESTARTSYS;
1052 if (gspca_dev->present)
1053 ret = ctrls->set(gspca_dev, ctrl->value);
1054 else
1055 ret = -ENODEV;
1056 mutex_unlock(&gspca_dev->usb_lock);
1057 return ret;
1058 }
1059 return -EINVAL;
1060 }
1061
1062 static int vidioc_g_ctrl(struct file *file, void *priv,
1063 struct v4l2_control *ctrl)
1064 {
1065 struct gspca_dev *gspca_dev = priv;
1066
1067 const struct ctrl *ctrls;
1068 int i, ret;
1069
1070 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1071 i < gspca_dev->sd_desc->nctrls;
1072 i++, ctrls++) {
1073 if (ctrl->id != ctrls->qctrl.id)
1074 continue;
1075 if (gspca_dev->ctrl_dis & (1 << i))
1076 return -EINVAL;
1077 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1078 return -ERESTARTSYS;
1079 if (gspca_dev->present)
1080 ret = ctrls->get(gspca_dev, &ctrl->value);
1081 else
1082 ret = -ENODEV;
1083 mutex_unlock(&gspca_dev->usb_lock);
1084 return ret;
1085 }
1086 return -EINVAL;
1087 }
1088
1089 /*fixme: have an audio flag in gspca_dev?*/
1090 static int vidioc_s_audio(struct file *file, void *priv,
1091 struct v4l2_audio *audio)
1092 {
1093 if (audio->index != 0)
1094 return -EINVAL;
1095 return 0;
1096 }
1097
1098 static int vidioc_g_audio(struct file *file, void *priv,
1099 struct v4l2_audio *audio)
1100 {
1101 strcpy(audio->name, "Microphone");
1102 return 0;
1103 }
1104
1105 static int vidioc_enumaudio(struct file *file, void *priv,
1106 struct v4l2_audio *audio)
1107 {
1108 if (audio->index != 0)
1109 return -EINVAL;
1110
1111 strcpy(audio->name, "Microphone");
1112 audio->capability = 0;
1113 audio->mode = 0;
1114 return 0;
1115 }
1116
1117 static int vidioc_querymenu(struct file *file, void *priv,
1118 struct v4l2_querymenu *qmenu)
1119 {
1120 struct gspca_dev *gspca_dev = priv;
1121
1122 if (!gspca_dev->sd_desc->querymenu)
1123 return -EINVAL;
1124 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1125 }
1126
1127 static int vidioc_enum_input(struct file *file, void *priv,
1128 struct v4l2_input *input)
1129 {
1130 struct gspca_dev *gspca_dev = priv;
1131
1132 if (input->index != 0)
1133 return -EINVAL;
1134 input->type = V4L2_INPUT_TYPE_CAMERA;
1135 input->status = gspca_dev->cam.input_flags;
1136 strncpy(input->name, gspca_dev->sd_desc->name,
1137 sizeof input->name);
1138 return 0;
1139 }
1140
1141 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1142 {
1143 *i = 0;
1144 return 0;
1145 }
1146
1147 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1148 {
1149 if (i > 0)
1150 return -EINVAL;
1151 return (0);
1152 }
1153
1154 static int vidioc_reqbufs(struct file *file, void *priv,
1155 struct v4l2_requestbuffers *rb)
1156 {
1157 struct gspca_dev *gspca_dev = priv;
1158 int i, ret = 0;
1159
1160 switch (rb->memory) {
1161 case GSPCA_MEMORY_READ: /* (internal call) */
1162 case V4L2_MEMORY_MMAP:
1163 case V4L2_MEMORY_USERPTR:
1164 break;
1165 default:
1166 return -EINVAL;
1167 }
1168 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1169 return -ERESTARTSYS;
1170
1171 if (gspca_dev->memory != GSPCA_MEMORY_NO
1172 && gspca_dev->memory != rb->memory) {
1173 ret = -EBUSY;
1174 goto out;
1175 }
1176
1177 /* only one file may do the capture */
1178 if (gspca_dev->capt_file != NULL
1179 && gspca_dev->capt_file != file) {
1180 ret = -EBUSY;
1181 goto out;
1182 }
1183
1184 /* if allocated, the buffers must not be mapped */
1185 for (i = 0; i < gspca_dev->nframes; i++) {
1186 if (gspca_dev->frame[i].vma_use_count) {
1187 ret = -EBUSY;
1188 goto out;
1189 }
1190 }
1191
1192 /* stop streaming */
1193 if (gspca_dev->streaming) {
1194 mutex_lock(&gspca_dev->usb_lock);
1195 gspca_stream_off(gspca_dev);
1196 mutex_unlock(&gspca_dev->usb_lock);
1197 }
1198
1199 /* free the previous allocated buffers, if any */
1200 if (gspca_dev->nframes != 0) {
1201 frame_free(gspca_dev);
1202 gspca_dev->capt_file = NULL;
1203 }
1204 if (rb->count == 0) /* unrequest */
1205 goto out;
1206 gspca_dev->memory = rb->memory;
1207 ret = frame_alloc(gspca_dev, rb->count);
1208 if (ret == 0) {
1209 rb->count = gspca_dev->nframes;
1210 gspca_dev->capt_file = file;
1211 }
1212 out:
1213 mutex_unlock(&gspca_dev->queue_lock);
1214 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1215 return ret;
1216 }
1217
1218 static int vidioc_querybuf(struct file *file, void *priv,
1219 struct v4l2_buffer *v4l2_buf)
1220 {
1221 struct gspca_dev *gspca_dev = priv;
1222 struct gspca_frame *frame;
1223
1224 if (v4l2_buf->index < 0
1225 || v4l2_buf->index >= gspca_dev->nframes)
1226 return -EINVAL;
1227
1228 frame = &gspca_dev->frame[v4l2_buf->index];
1229 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1230 return 0;
1231 }
1232
1233 static int vidioc_streamon(struct file *file, void *priv,
1234 enum v4l2_buf_type buf_type)
1235 {
1236 struct gspca_dev *gspca_dev = priv;
1237 int ret;
1238
1239 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1240 return -EINVAL;
1241 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1242 return -ERESTARTSYS;
1243
1244 if (gspca_dev->nframes == 0
1245 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1246 ret = -EINVAL;
1247 goto out;
1248 }
1249 if (!gspca_dev->streaming) {
1250 ret = gspca_init_transfer(gspca_dev);
1251 if (ret < 0)
1252 goto out;
1253 }
1254 #ifdef GSPCA_DEBUG
1255 if (gspca_debug & D_STREAM) {
1256 PDEBUG_MODE("stream on OK",
1257 gspca_dev->pixfmt,
1258 gspca_dev->width,
1259 gspca_dev->height);
1260 }
1261 #endif
1262 ret = 0;
1263 out:
1264 mutex_unlock(&gspca_dev->queue_lock);
1265 return ret;
1266 }
1267
1268 static int vidioc_streamoff(struct file *file, void *priv,
1269 enum v4l2_buf_type buf_type)
1270 {
1271 struct gspca_dev *gspca_dev = priv;
1272 int i, ret;
1273
1274 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1275 return -EINVAL;
1276 if (!gspca_dev->streaming)
1277 return 0;
1278 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1279 return -ERESTARTSYS;
1280
1281 /* stop streaming */
1282 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1283 ret = -ERESTARTSYS;
1284 goto out;
1285 }
1286 gspca_stream_off(gspca_dev);
1287 mutex_unlock(&gspca_dev->usb_lock);
1288
1289 /* empty the application queues */
1290 for (i = 0; i < gspca_dev->nframes; i++)
1291 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1292 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1293 gspca_dev->last_packet_type = DISCARD_PACKET;
1294 gspca_dev->sequence = 0;
1295 ret = 0;
1296 out:
1297 mutex_unlock(&gspca_dev->queue_lock);
1298 return ret;
1299 }
1300
1301 static int vidioc_g_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->get_jcomp)
1308 return -EINVAL;
1309 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1310 return -ERESTARTSYS;
1311 if (gspca_dev->present)
1312 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1313 else
1314 ret = -ENODEV;
1315 mutex_unlock(&gspca_dev->usb_lock);
1316 return ret;
1317 }
1318
1319 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1320 struct v4l2_jpegcompression *jpegcomp)
1321 {
1322 struct gspca_dev *gspca_dev = priv;
1323 int ret;
1324
1325 if (!gspca_dev->sd_desc->set_jcomp)
1326 return -EINVAL;
1327 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1328 return -ERESTARTSYS;
1329 if (gspca_dev->present)
1330 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1331 else
1332 ret = -ENODEV;
1333 mutex_unlock(&gspca_dev->usb_lock);
1334 return ret;
1335 }
1336
1337 static int vidioc_g_parm(struct file *filp, void *priv,
1338 struct v4l2_streamparm *parm)
1339 {
1340 struct gspca_dev *gspca_dev = priv;
1341
1342 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1343
1344 if (gspca_dev->sd_desc->get_streamparm) {
1345 int ret;
1346
1347 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1348 return -ERESTARTSYS;
1349 if (gspca_dev->present)
1350 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1351 parm);
1352 else
1353 ret = -ENODEV;
1354 mutex_unlock(&gspca_dev->usb_lock);
1355 return ret;
1356 }
1357
1358 return 0;
1359 }
1360
1361 static int vidioc_s_parm(struct file *filp, void *priv,
1362 struct v4l2_streamparm *parm)
1363 {
1364 struct gspca_dev *gspca_dev = priv;
1365 int n;
1366
1367 n = parm->parm.capture.readbuffers;
1368 if (n == 0 || n > GSPCA_MAX_FRAMES)
1369 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1370 else
1371 gspca_dev->nbufread = n;
1372
1373 if (gspca_dev->sd_desc->set_streamparm) {
1374 int ret;
1375
1376 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1377 return -ERESTARTSYS;
1378 if (gspca_dev->present)
1379 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1380 parm);
1381 else
1382 ret = -ENODEV;
1383 mutex_unlock(&gspca_dev->usb_lock);
1384 return ret;
1385 }
1386
1387 return 0;
1388 }
1389
1390 static int vidioc_s_std(struct file *filp, void *priv,
1391 v4l2_std_id *parm)
1392 {
1393 return 0;
1394 }
1395
1396 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1397 static int vidiocgmbuf(struct file *file, void *priv,
1398 struct video_mbuf *mbuf)
1399 {
1400 struct gspca_dev *gspca_dev = file->private_data;
1401 int i;
1402
1403 PDEBUG(D_STREAM, "cgmbuf");
1404 if (gspca_dev->nframes == 0) {
1405 int ret;
1406
1407 {
1408 struct v4l2_format fmt;
1409
1410 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1411 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1412 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1413 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1414 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1415 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1416 if (ret != 0)
1417 return ret;
1418 }
1419 {
1420 struct v4l2_requestbuffers rb;
1421
1422 memset(&rb, 0, sizeof rb);
1423 rb.count = 4;
1424 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1425 rb.memory = V4L2_MEMORY_MMAP;
1426 ret = vidioc_reqbufs(file, priv, &rb);
1427 if (ret != 0)
1428 return ret;
1429 }
1430 }
1431 mbuf->frames = gspca_dev->nframes;
1432 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1433 for (i = 0; i < mbuf->frames; i++)
1434 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1435 return 0;
1436 }
1437 #endif
1438
1439 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1440 {
1441 struct gspca_dev *gspca_dev = file->private_data;
1442 struct gspca_frame *frame;
1443 struct page *page;
1444 unsigned long addr, start, size;
1445 int i, ret;
1446
1447 start = vma->vm_start;
1448 size = vma->vm_end - vma->vm_start;
1449 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1450
1451 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1452 return -ERESTARTSYS;
1453 if (!gspca_dev->present) {
1454 ret = -ENODEV;
1455 goto out;
1456 }
1457 if (gspca_dev->capt_file != file) {
1458 ret = -EINVAL;
1459 goto out;
1460 }
1461
1462 frame = NULL;
1463 for (i = 0; i < gspca_dev->nframes; ++i) {
1464 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1465 PDEBUG(D_STREAM, "mmap bad memory type");
1466 break;
1467 }
1468 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1469 == vma->vm_pgoff) {
1470 frame = &gspca_dev->frame[i];
1471 break;
1472 }
1473 }
1474 if (frame == NULL) {
1475 PDEBUG(D_STREAM, "mmap no frame buffer found");
1476 ret = -EINVAL;
1477 goto out;
1478 }
1479 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1480 /* v4l1 maps all the buffers */
1481 if (i != 0
1482 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1483 #endif
1484 if (size != frame->v4l2_buf.length) {
1485 PDEBUG(D_STREAM, "mmap bad size");
1486 ret = -EINVAL;
1487 goto out;
1488 }
1489
1490 /*
1491 * - VM_IO marks the area as being a mmaped region for I/O to a
1492 * device. It also prevents the region from being core dumped.
1493 */
1494 vma->vm_flags |= VM_IO;
1495
1496 addr = (unsigned long) frame->data;
1497 while (size > 0) {
1498 page = vmalloc_to_page((void *) addr);
1499 ret = vm_insert_page(vma, start, page);
1500 if (ret < 0)
1501 goto out;
1502 start += PAGE_SIZE;
1503 addr += PAGE_SIZE;
1504 size -= PAGE_SIZE;
1505 }
1506
1507 vma->vm_ops = &gspca_vm_ops;
1508 vma->vm_private_data = frame;
1509 gspca_vm_open(vma);
1510 ret = 0;
1511 out:
1512 mutex_unlock(&gspca_dev->queue_lock);
1513 return ret;
1514 }
1515
1516 /*
1517 * wait for a video frame
1518 *
1519 * If a frame is ready, its index is returned.
1520 */
1521 static int frame_wait(struct gspca_dev *gspca_dev,
1522 int nonblock_ing)
1523 {
1524 struct gspca_frame *frame;
1525 int i, j, ret;
1526
1527 /* check if a frame is ready */
1528 i = gspca_dev->fr_o;
1529 j = gspca_dev->fr_queue[i];
1530 frame = &gspca_dev->frame[j];
1531
1532 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1533 if (nonblock_ing)
1534 return -EAGAIN;
1535
1536 /* wait till a frame is ready */
1537 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1538 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1539 !gspca_dev->streaming || !gspca_dev->present,
1540 msecs_to_jiffies(3000));
1541 if (ret < 0)
1542 return ret;
1543 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1544 return -EIO;
1545 }
1546
1547 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1548 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1549 gspca_dev->fr_q,
1550 gspca_dev->fr_i,
1551 gspca_dev->fr_o);
1552
1553 if (gspca_dev->sd_desc->dq_callback) {
1554 mutex_lock(&gspca_dev->usb_lock);
1555 if (gspca_dev->present)
1556 gspca_dev->sd_desc->dq_callback(gspca_dev);
1557 mutex_unlock(&gspca_dev->usb_lock);
1558 }
1559 return j;
1560 }
1561
1562 /*
1563 * dequeue a video buffer
1564 *
1565 * If nonblock_ing is false, block until a buffer is available.
1566 */
1567 static int vidioc_dqbuf(struct file *file, void *priv,
1568 struct v4l2_buffer *v4l2_buf)
1569 {
1570 struct gspca_dev *gspca_dev = priv;
1571 struct gspca_frame *frame;
1572 int i, ret;
1573
1574 PDEBUG(D_FRAM, "dqbuf");
1575 if (v4l2_buf->memory != gspca_dev->memory)
1576 return -EINVAL;
1577
1578 if (!gspca_dev->present)
1579 return -ENODEV;
1580
1581 /* if not streaming, be sure the application will not loop forever */
1582 if (!(file->f_flags & O_NONBLOCK)
1583 && !gspca_dev->streaming && gspca_dev->users == 1)
1584 return -EINVAL;
1585
1586 /* only the capturing file may dequeue */
1587 if (gspca_dev->capt_file != file)
1588 return -EINVAL;
1589
1590 /* only one dequeue / read at a time */
1591 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1592 return -ERESTARTSYS;
1593
1594 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1595 if (ret < 0)
1596 goto out;
1597 i = ret; /* frame index */
1598 frame = &gspca_dev->frame[i];
1599 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1600 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1601 frame->data,
1602 frame->v4l2_buf.bytesused)) {
1603 PDEBUG(D_ERR|D_STREAM,
1604 "dqbuf cp to user failed");
1605 ret = -EFAULT;
1606 goto out;
1607 }
1608 }
1609 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1610 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1611 PDEBUG(D_FRAM, "dqbuf %d", i);
1612 ret = 0;
1613 out:
1614 mutex_unlock(&gspca_dev->read_lock);
1615 return ret;
1616 }
1617
1618 /*
1619 * queue a video buffer
1620 *
1621 * Attempting to queue a buffer that has already been
1622 * queued will return -EINVAL.
1623 */
1624 static int vidioc_qbuf(struct file *file, void *priv,
1625 struct v4l2_buffer *v4l2_buf)
1626 {
1627 struct gspca_dev *gspca_dev = priv;
1628 struct gspca_frame *frame;
1629 int i, index, ret;
1630
1631 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1632
1633 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1634 return -ERESTARTSYS;
1635
1636 index = v4l2_buf->index;
1637 if ((unsigned) index >= gspca_dev->nframes) {
1638 PDEBUG(D_FRAM,
1639 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1640 ret = -EINVAL;
1641 goto out;
1642 }
1643 if (v4l2_buf->memory != gspca_dev->memory) {
1644 PDEBUG(D_FRAM, "qbuf bad memory type");
1645 ret = -EINVAL;
1646 goto out;
1647 }
1648
1649 frame = &gspca_dev->frame[index];
1650 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1651 PDEBUG(D_FRAM, "qbuf bad state");
1652 ret = -EINVAL;
1653 goto out;
1654 }
1655
1656 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1657
1658 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1659 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1660 frame->v4l2_buf.length = v4l2_buf->length;
1661 }
1662
1663 /* put the buffer in the 'queued' queue */
1664 i = gspca_dev->fr_q;
1665 gspca_dev->fr_queue[i] = index;
1666 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1667 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1668 gspca_dev->fr_q,
1669 gspca_dev->fr_i,
1670 gspca_dev->fr_o);
1671
1672 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1673 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1674 ret = 0;
1675 out:
1676 mutex_unlock(&gspca_dev->queue_lock);
1677 return ret;
1678 }
1679
1680 /*
1681 * allocate the resources for read()
1682 */
1683 static int read_alloc(struct gspca_dev *gspca_dev,
1684 struct file *file)
1685 {
1686 struct v4l2_buffer v4l2_buf;
1687 int i, ret;
1688
1689 PDEBUG(D_STREAM, "read alloc");
1690 if (gspca_dev->nframes == 0) {
1691 struct v4l2_requestbuffers rb;
1692
1693 memset(&rb, 0, sizeof rb);
1694 rb.count = gspca_dev->nbufread;
1695 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1696 rb.memory = GSPCA_MEMORY_READ;
1697 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1698 if (ret != 0) {
1699 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1700 return ret;
1701 }
1702 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1703 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1704 v4l2_buf.memory = GSPCA_MEMORY_READ;
1705 for (i = 0; i < gspca_dev->nbufread; i++) {
1706 v4l2_buf.index = i;
1707 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1708 if (ret != 0) {
1709 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1710 return ret;
1711 }
1712 }
1713 gspca_dev->memory = GSPCA_MEMORY_READ;
1714 }
1715
1716 /* start streaming */
1717 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1718 if (ret != 0)
1719 PDEBUG(D_STREAM, "read streamon err %d", ret);
1720 return ret;
1721 }
1722
1723 static unsigned int dev_poll(struct file *file, poll_table *wait)
1724 {
1725 struct gspca_dev *gspca_dev = file->private_data;
1726 int i, ret;
1727
1728 PDEBUG(D_FRAM, "poll");
1729
1730 poll_wait(file, &gspca_dev->wq, wait);
1731
1732 /* if reqbufs is not done, the user would use read() */
1733 if (gspca_dev->nframes == 0) {
1734 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1735 return POLLERR; /* not the 1st time */
1736 ret = read_alloc(gspca_dev, file);
1737 if (ret != 0)
1738 return POLLERR;
1739 }
1740
1741 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1742 return POLLERR;
1743
1744 /* check the next incoming buffer */
1745 i = gspca_dev->fr_o;
1746 i = gspca_dev->fr_queue[i];
1747 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1748 ret = POLLIN | POLLRDNORM; /* something to read */
1749 else
1750 ret = 0;
1751 mutex_unlock(&gspca_dev->queue_lock);
1752 if (!gspca_dev->present)
1753 return POLLHUP;
1754 return ret;
1755 }
1756
1757 static ssize_t dev_read(struct file *file, char __user *data,
1758 size_t count, loff_t *ppos)
1759 {
1760 struct gspca_dev *gspca_dev = file->private_data;
1761 struct gspca_frame *frame;
1762 struct v4l2_buffer v4l2_buf;
1763 struct timeval timestamp;
1764 int n, ret, ret2;
1765
1766 PDEBUG(D_FRAM, "read (%zd)", count);
1767 if (!gspca_dev->present)
1768 return -ENODEV;
1769 switch (gspca_dev->memory) {
1770 case GSPCA_MEMORY_NO: /* first time */
1771 ret = read_alloc(gspca_dev, file);
1772 if (ret != 0)
1773 return ret;
1774 break;
1775 case GSPCA_MEMORY_READ:
1776 if (gspca_dev->capt_file == file)
1777 break;
1778 /* fall thru */
1779 default:
1780 return -EINVAL;
1781 }
1782
1783 /* get a frame */
1784 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1785 timestamp.tv_sec--;
1786 n = 2;
1787 for (;;) {
1788 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1789 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1790 v4l2_buf.memory = GSPCA_MEMORY_READ;
1791 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1792 if (ret != 0) {
1793 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1794 return ret;
1795 }
1796
1797 /* if the process slept for more than 1 second,
1798 * get a newer frame */
1799 frame = &gspca_dev->frame[v4l2_buf.index];
1800 if (--n < 0)
1801 break; /* avoid infinite loop */
1802 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1803 break;
1804 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1805 if (ret != 0) {
1806 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1807 return ret;
1808 }
1809 }
1810
1811 /* copy the frame */
1812 if (count > frame->v4l2_buf.bytesused)
1813 count = frame->v4l2_buf.bytesused;
1814 ret = copy_to_user(data, frame->data, count);
1815 if (ret != 0) {
1816 PDEBUG(D_ERR|D_STREAM,
1817 "read cp to user lack %d / %zd", ret, count);
1818 ret = -EFAULT;
1819 goto out;
1820 }
1821 ret = count;
1822 out:
1823 /* in each case, requeue the buffer */
1824 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1825 if (ret2 != 0)
1826 return ret2;
1827 return ret;
1828 }
1829
1830 static struct v4l2_file_operations dev_fops = {
1831 .owner = THIS_MODULE,
1832 .open = dev_open,
1833 .release = dev_close,
1834 .read = dev_read,
1835 .mmap = dev_mmap,
1836 .unlocked_ioctl = video_ioctl2,
1837 .poll = dev_poll,
1838 };
1839
1840 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1841 .vidioc_querycap = vidioc_querycap,
1842 .vidioc_dqbuf = vidioc_dqbuf,
1843 .vidioc_qbuf = vidioc_qbuf,
1844 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1845 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1846 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1847 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1848 .vidioc_streamon = vidioc_streamon,
1849 .vidioc_queryctrl = vidioc_queryctrl,
1850 .vidioc_g_ctrl = vidioc_g_ctrl,
1851 .vidioc_s_ctrl = vidioc_s_ctrl,
1852 .vidioc_g_audio = vidioc_g_audio,
1853 .vidioc_s_audio = vidioc_s_audio,
1854 .vidioc_enumaudio = vidioc_enumaudio,
1855 .vidioc_querymenu = vidioc_querymenu,
1856 .vidioc_enum_input = vidioc_enum_input,
1857 .vidioc_g_input = vidioc_g_input,
1858 .vidioc_s_input = vidioc_s_input,
1859 .vidioc_reqbufs = vidioc_reqbufs,
1860 .vidioc_querybuf = vidioc_querybuf,
1861 .vidioc_streamoff = vidioc_streamoff,
1862 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1863 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1864 .vidioc_g_parm = vidioc_g_parm,
1865 .vidioc_s_parm = vidioc_s_parm,
1866 .vidioc_s_std = vidioc_s_std,
1867 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1868 .vidiocgmbuf = vidiocgmbuf,
1869 #endif
1870 };
1871
1872 static struct video_device gspca_template = {
1873 .name = "gspca main driver",
1874 .fops = &dev_fops,
1875 .ioctl_ops = &dev_ioctl_ops,
1876 .release = gspca_release,
1877 .minor = -1,
1878 };
1879
1880 /*
1881 * probe and create a new gspca device
1882 *
1883 * This function must be called by the sub-driver when it is
1884 * called for probing a new device.
1885 */
1886 int gspca_dev_probe(struct usb_interface *intf,
1887 const struct usb_device_id *id,
1888 const struct sd_desc *sd_desc,
1889 int dev_size,
1890 struct module *module)
1891 {
1892 struct usb_interface_descriptor *interface;
1893 struct gspca_dev *gspca_dev;
1894 struct usb_device *dev = interface_to_usbdev(intf);
1895 int ret;
1896
1897 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1898
1899 /* we don't handle multi-config cameras */
1900 if (dev->descriptor.bNumConfigurations != 1)
1901 return -ENODEV;
1902 interface = &intf->cur_altsetting->desc;
1903 if (interface->bInterfaceNumber > 0)
1904 return -ENODEV;
1905
1906 /* create the device */
1907 if (dev_size < sizeof *gspca_dev)
1908 dev_size = sizeof *gspca_dev;
1909 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1910 if (!gspca_dev) {
1911 err("couldn't kzalloc gspca struct");
1912 return -ENOMEM;
1913 }
1914 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1915 if (!gspca_dev->usb_buf) {
1916 err("out of memory");
1917 ret = -ENOMEM;
1918 goto out;
1919 }
1920 gspca_dev->dev = dev;
1921 gspca_dev->iface = interface->bInterfaceNumber;
1922 gspca_dev->nbalt = intf->num_altsetting;
1923 gspca_dev->sd_desc = sd_desc;
1924 gspca_dev->nbufread = 2;
1925 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1926
1927 /* configure the subdriver and initialize the USB device */
1928 ret = sd_desc->config(gspca_dev, id);
1929 if (ret < 0)
1930 goto out;
1931 ret = sd_desc->init(gspca_dev);
1932 if (ret < 0)
1933 goto out;
1934 ret = gspca_set_alt0(gspca_dev);
1935 if (ret < 0)
1936 goto out;
1937 gspca_set_default_mode(gspca_dev);
1938
1939 mutex_init(&gspca_dev->usb_lock);
1940 mutex_init(&gspca_dev->read_lock);
1941 mutex_init(&gspca_dev->queue_lock);
1942 init_waitqueue_head(&gspca_dev->wq);
1943
1944 /* init video stuff */
1945 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1946 gspca_dev->vdev.parent = &dev->dev;
1947 gspca_dev->module = module;
1948 gspca_dev->present = 1;
1949 ret = video_register_device(&gspca_dev->vdev,
1950 VFL_TYPE_GRABBER,
1951 -1);
1952 if (ret < 0) {
1953 err("video_register_device err %d", ret);
1954 goto out;
1955 }
1956
1957 usb_set_intfdata(intf, gspca_dev);
1958 PDEBUG(D_PROBE, "probe ok");
1959 return 0;
1960 out:
1961 kfree(gspca_dev->usb_buf);
1962 kfree(gspca_dev);
1963 return ret;
1964 }
1965 EXPORT_SYMBOL(gspca_dev_probe);
1966
1967 /*
1968 * USB disconnection
1969 *
1970 * This function must be called by the sub-driver
1971 * when the device disconnects, after the specific resources are freed.
1972 */
1973 void gspca_disconnect(struct usb_interface *intf)
1974 {
1975 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1976
1977 mutex_lock(&gspca_dev->usb_lock);
1978 gspca_dev->present = 0;
1979
1980 if (gspca_dev->streaming) {
1981 destroy_urbs(gspca_dev);
1982 wake_up_interruptible(&gspca_dev->wq);
1983 }
1984
1985 /* the device is freed at exit of this function */
1986 gspca_dev->dev = NULL;
1987 mutex_unlock(&gspca_dev->usb_lock);
1988
1989 usb_set_intfdata(intf, NULL);
1990
1991 /* release the device */
1992 /* (this will call gspca_release() immediatly or on last close) */
1993 video_unregister_device(&gspca_dev->vdev);
1994
1995 PDEBUG(D_PROBE, "disconnect complete");
1996 }
1997 EXPORT_SYMBOL(gspca_disconnect);
1998
1999 #ifdef CONFIG_PM
2000 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2001 {
2002 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2003
2004 if (!gspca_dev->streaming)
2005 return 0;
2006 gspca_dev->frozen = 1; /* avoid urb error messages */
2007 if (gspca_dev->sd_desc->stopN)
2008 gspca_dev->sd_desc->stopN(gspca_dev);
2009 destroy_urbs(gspca_dev);
2010 gspca_set_alt0(gspca_dev);
2011 if (gspca_dev->sd_desc->stop0)
2012 gspca_dev->sd_desc->stop0(gspca_dev);
2013 return 0;
2014 }
2015 EXPORT_SYMBOL(gspca_suspend);
2016
2017 int gspca_resume(struct usb_interface *intf)
2018 {
2019 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2020
2021 gspca_dev->frozen = 0;
2022 gspca_dev->sd_desc->init(gspca_dev);
2023 if (gspca_dev->streaming)
2024 return gspca_init_transfer(gspca_dev);
2025 return 0;
2026 }
2027 EXPORT_SYMBOL(gspca_resume);
2028 #endif
2029 /* -- cam driver utility functions -- */
2030
2031 /* auto gain and exposure algorithm based on the knee algorithm described here:
2032 http://ytse.tricolour.net/docs/LowLightOptimization.html
2033
2034 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2035 where changed. */
2036 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2037 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2038 {
2039 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2040 const struct ctrl *gain_ctrl = NULL;
2041 const struct ctrl *exposure_ctrl = NULL;
2042 const struct ctrl *autogain_ctrl = NULL;
2043 int retval = 0;
2044
2045 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2046 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2047 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2048 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2049 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2050 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2051 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2052 }
2053 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2054 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2055 "on cam without (auto)gain/exposure");
2056 return 0;
2057 }
2058
2059 if (gain_ctrl->get(gspca_dev, &gain) ||
2060 exposure_ctrl->get(gspca_dev, &exposure) ||
2061 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2062 return 0;
2063
2064 orig_gain = gain;
2065 orig_exposure = exposure;
2066
2067 /* If we are of a multiple of deadzone, do multiple steps to reach the
2068 desired lumination fast (with the risc of a slight overshoot) */
2069 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2070
2071 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2072 avg_lum, desired_avg_lum, steps);
2073
2074 for (i = 0; i < steps; i++) {
2075 if (avg_lum > desired_avg_lum) {
2076 if (gain > gain_knee)
2077 gain--;
2078 else if (exposure > exposure_knee)
2079 exposure--;
2080 else if (gain > gain_ctrl->qctrl.default_value)
2081 gain--;
2082 else if (exposure > exposure_ctrl->qctrl.minimum)
2083 exposure--;
2084 else if (gain > gain_ctrl->qctrl.minimum)
2085 gain--;
2086 else
2087 break;
2088 } else {
2089 if (gain < gain_ctrl->qctrl.default_value)
2090 gain++;
2091 else if (exposure < exposure_knee)
2092 exposure++;
2093 else if (gain < gain_knee)
2094 gain++;
2095 else if (exposure < exposure_ctrl->qctrl.maximum)
2096 exposure++;
2097 else if (gain < gain_ctrl->qctrl.maximum)
2098 gain++;
2099 else
2100 break;
2101 }
2102 }
2103
2104 if (gain != orig_gain) {
2105 gain_ctrl->set(gspca_dev, gain);
2106 retval = 1;
2107 }
2108 if (exposure != orig_exposure) {
2109 exposure_ctrl->set(gspca_dev, exposure);
2110 retval = 1;
2111 }
2112
2113 return retval;
2114 }
2115 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2116
2117 /* -- module insert / remove -- */
2118 static int __init gspca_init(void)
2119 {
2120 info("main v%d.%d.%d registered",
2121 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2122 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2123 DRIVER_VERSION_NUMBER & 0xff);
2124 return 0;
2125 }
2126 static void __exit gspca_exit(void)
2127 {
2128 info("main deregistered");
2129 }
2130
2131 module_init(gspca_init);
2132 module_exit(gspca_exit);
2133
2134 #ifdef GSPCA_DEBUG
2135 module_param_named(debug, gspca_debug, int, 0644);
2136 MODULE_PARM_DESC(debug,
2137 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2138 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2139 " 0x0100: v4l2");
2140 #endif
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