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V4L/DVB (11710): gspca - main: Webcams cannot do both isoc and bulk image transfers.
[linux-2.6/verdex.git] / drivers / media / video / gspca / gspca.c
blob873e95580407a8479287ff020495c5ee8d340dcc
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2009 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, 6, 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 int 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 xfer, i, ret;
471
472 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
473 ep = NULL;
474 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
475 : USB_ENDPOINT_XFER_ISOC;
476 i = gspca_dev->alt; /* previous alt setting */
477 while (--i >= 0) {
478 ep = alt_xfer(&intf->altsetting[i], xfer);
479 if (ep)
480 break;
481 }
482 if (ep == NULL) {
483 err("no transfer endpoint found");
484 return NULL;
485 }
486 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
487 i, ep->desc.bEndpointAddress);
488 if (i > 0) {
489 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
490 if (ret < 0) {
491 err("set alt %d err %d", i, ret);
492 return NULL;
493 }
494 }
495 gspca_dev->alt = i; /* memorize the current alt setting */
496 return ep;
497 }
498
499 /*
500 * create the URBs for image transfer
501 */
502 static int create_urbs(struct gspca_dev *gspca_dev,
503 struct usb_host_endpoint *ep)
504 {
505 struct urb *urb;
506 int n, nurbs, i, psize, npkt, bsize;
507
508 /* calculate the packet size and the number of packets */
509 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
510
511 if (!gspca_dev->cam.bulk) { /* isoc */
512
513 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
514 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
515 npkt = ISO_MAX_SIZE / psize;
516 if (npkt > ISO_MAX_PKT)
517 npkt = ISO_MAX_PKT;
518 bsize = psize * npkt;
519 PDEBUG(D_STREAM,
520 "isoc %d pkts size %d = bsize:%d",
521 npkt, psize, bsize);
522 nurbs = DEF_NURBS;
523 } else { /* bulk */
524 npkt = 0;
525 bsize = gspca_dev->cam.bulk_size;
526 if (bsize == 0)
527 bsize = psize;
528 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
529 if (gspca_dev->cam.bulk_nurbs != 0)
530 nurbs = gspca_dev->cam.bulk_nurbs;
531 else
532 nurbs = 1;
533 }
534
535 gspca_dev->nurbs = nurbs;
536 for (n = 0; n < nurbs; n++) {
537 urb = usb_alloc_urb(npkt, GFP_KERNEL);
538 if (!urb) {
539 err("usb_alloc_urb failed");
540 destroy_urbs(gspca_dev);
541 return -ENOMEM;
542 }
543 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
544 bsize,
545 GFP_KERNEL,
546 &urb->transfer_dma);
547
548 if (urb->transfer_buffer == NULL) {
549 usb_free_urb(urb);
550 err("usb_buffer_urb failed");
551 destroy_urbs(gspca_dev);
552 return -ENOMEM;
553 }
554 gspca_dev->urb[n] = urb;
555 urb->dev = gspca_dev->dev;
556 urb->context = gspca_dev;
557 urb->transfer_buffer_length = bsize;
558 if (npkt != 0) { /* ISOC */
559 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
560 ep->desc.bEndpointAddress);
561 urb->transfer_flags = URB_ISO_ASAP
562 | URB_NO_TRANSFER_DMA_MAP;
563 urb->interval = ep->desc.bInterval;
564 urb->complete = isoc_irq;
565 urb->number_of_packets = npkt;
566 for (i = 0; i < npkt; i++) {
567 urb->iso_frame_desc[i].length = psize;
568 urb->iso_frame_desc[i].offset = psize * i;
569 }
570 } else { /* bulk */
571 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
572 ep->desc.bEndpointAddress),
573 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
574 urb->complete = bulk_irq;
575 }
576 }
577 return 0;
578 }
579
580 /*
581 * start the USB transfer
582 */
583 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
584 {
585 struct usb_host_endpoint *ep;
586 int n, ret;
587
588 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
589 return -ERESTARTSYS;
590
591 if (!gspca_dev->present) {
592 ret = -ENODEV;
593 goto out;
594 }
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->cam.bulk)
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->cam.bulk && 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 if (gspca_dev->sd_desc->stopN)
667 gspca_dev->sd_desc->stopN(gspca_dev);
668 destroy_urbs(gspca_dev);
669 gspca_set_alt0(gspca_dev);
670 }
671
672 /* always call stop0 to free the subdriver's resources */
673 if (gspca_dev->sd_desc->stop0)
674 gspca_dev->sd_desc->stop0(gspca_dev);
675 PDEBUG(D_STREAM, "stream off OK");
676 }
677
678 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
679 {
680 int i;
681
682 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
683 gspca_dev->curr_mode = i;
684 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
685 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
686 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
687 }
688
689 static int wxh_to_mode(struct gspca_dev *gspca_dev,
690 int width, int height)
691 {
692 int i;
693
694 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
695 if (width >= gspca_dev->cam.cam_mode[i].width
696 && height >= gspca_dev->cam.cam_mode[i].height)
697 break;
698 }
699 return i;
700 }
701
702 /*
703 * search a mode with the right pixel format
704 */
705 static int gspca_get_mode(struct gspca_dev *gspca_dev,
706 int mode,
707 int pixfmt)
708 {
709 int modeU, modeD;
710
711 modeU = modeD = mode;
712 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
713 if (--modeD >= 0) {
714 if (gspca_dev->cam.cam_mode[modeD].pixelformat
715 == pixfmt)
716 return modeD;
717 }
718 if (++modeU < gspca_dev->cam.nmodes) {
719 if (gspca_dev->cam.cam_mode[modeU].pixelformat
720 == pixfmt)
721 return modeU;
722 }
723 }
724 return -EINVAL;
725 }
726
727 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
728 struct v4l2_fmtdesc *fmtdesc)
729 {
730 struct gspca_dev *gspca_dev = priv;
731 int i, j, index;
732 __u32 fmt_tb[8];
733
734 /* give an index to each format */
735 index = 0;
736 j = 0;
737 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
738 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
739 j = 0;
740 for (;;) {
741 if (fmt_tb[j] == fmt_tb[index])
742 break;
743 j++;
744 }
745 if (j == index) {
746 if (fmtdesc->index == index)
747 break; /* new format */
748 index++;
749 if (index >= ARRAY_SIZE(fmt_tb))
750 return -EINVAL;
751 }
752 }
753 if (i < 0)
754 return -EINVAL; /* no more format */
755
756 fmtdesc->pixelformat = fmt_tb[index];
757 if (gspca_is_compressed(fmt_tb[index]))
758 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
759 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
760 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
761 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
762 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
763 fmtdesc->description[4] = '\0';
764 return 0;
765 }
766
767 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
768 struct v4l2_format *fmt)
769 {
770 struct gspca_dev *gspca_dev = priv;
771 int mode;
772
773 mode = gspca_dev->curr_mode;
774 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
775 sizeof fmt->fmt.pix);
776 return 0;
777 }
778
779 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
780 struct v4l2_format *fmt)
781 {
782 int w, h, mode, mode2;
783
784 w = fmt->fmt.pix.width;
785 h = fmt->fmt.pix.height;
786
787 #ifdef GSPCA_DEBUG
788 if (gspca_debug & D_CONF)
789 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
790 #endif
791 /* search the closest mode for width and height */
792 mode = wxh_to_mode(gspca_dev, w, h);
793
794 /* OK if right palette */
795 if (gspca_dev->cam.cam_mode[mode].pixelformat
796 != fmt->fmt.pix.pixelformat) {
797
798 /* else, search the closest mode with the same pixel format */
799 mode2 = gspca_get_mode(gspca_dev, mode,
800 fmt->fmt.pix.pixelformat);
801 if (mode2 >= 0)
802 mode = mode2;
803 /* else
804 ; * no chance, return this mode */
805 }
806 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
807 sizeof fmt->fmt.pix);
808 return mode; /* used when s_fmt */
809 }
810
811 static int vidioc_try_fmt_vid_cap(struct file *file,
812 void *priv,
813 struct v4l2_format *fmt)
814 {
815 struct gspca_dev *gspca_dev = priv;
816 int ret;
817
818 ret = try_fmt_vid_cap(gspca_dev, fmt);
819 if (ret < 0)
820 return ret;
821 return 0;
822 }
823
824 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
825 struct v4l2_format *fmt)
826 {
827 struct gspca_dev *gspca_dev = priv;
828 int ret;
829
830 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
831 return -ERESTARTSYS;
832
833 ret = try_fmt_vid_cap(gspca_dev, fmt);
834 if (ret < 0)
835 goto out;
836
837 if (gspca_dev->nframes != 0
838 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
839 ret = -EINVAL;
840 goto out;
841 }
842
843 if (ret == gspca_dev->curr_mode) {
844 ret = 0;
845 goto out; /* same mode */
846 }
847
848 if (gspca_dev->streaming) {
849 ret = -EBUSY;
850 goto out;
851 }
852 gspca_dev->width = fmt->fmt.pix.width;
853 gspca_dev->height = fmt->fmt.pix.height;
854 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
855 gspca_dev->curr_mode = ret;
856
857 ret = 0;
858 out:
859 mutex_unlock(&gspca_dev->queue_lock);
860 return ret;
861 }
862
863 static void gspca_release(struct video_device *vfd)
864 {
865 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
866
867 PDEBUG(D_STREAM, "device released");
868
869 kfree(gspca_dev->usb_buf);
870 kfree(gspca_dev);
871 }
872
873 static int dev_open(struct file *file)
874 {
875 struct gspca_dev *gspca_dev;
876 int ret;
877
878 PDEBUG(D_STREAM, "%s open", current->comm);
879 gspca_dev = (struct gspca_dev *) video_devdata(file);
880 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
881 return -ERESTARTSYS;
882 if (!gspca_dev->present) {
883 ret = -ENODEV;
884 goto out;
885 }
886
887 if (gspca_dev->users > 4) { /* (arbitrary value) */
888 ret = -EBUSY;
889 goto out;
890 }
891
892 /* protect the subdriver against rmmod */
893 if (!try_module_get(gspca_dev->module)) {
894 ret = -ENODEV;
895 goto out;
896 }
897
898 gspca_dev->users++;
899
900 file->private_data = gspca_dev;
901 #ifdef GSPCA_DEBUG
902 /* activate the v4l2 debug */
903 if (gspca_debug & D_V4L2)
904 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
905 | V4L2_DEBUG_IOCTL_ARG;
906 else
907 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
908 | V4L2_DEBUG_IOCTL_ARG);
909 #endif
910 ret = 0;
911 out:
912 mutex_unlock(&gspca_dev->queue_lock);
913 if (ret != 0)
914 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
915 else
916 PDEBUG(D_STREAM, "open done");
917 return ret;
918 }
919
920 static int dev_close(struct file *file)
921 {
922 struct gspca_dev *gspca_dev = file->private_data;
923
924 PDEBUG(D_STREAM, "%s close", current->comm);
925 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
926 return -ERESTARTSYS;
927 gspca_dev->users--;
928
929 /* if the file did the capture, free the streaming resources */
930 if (gspca_dev->capt_file == file) {
931 if (gspca_dev->streaming) {
932 mutex_lock(&gspca_dev->usb_lock);
933 gspca_stream_off(gspca_dev);
934 mutex_unlock(&gspca_dev->usb_lock);
935 }
936 frame_free(gspca_dev);
937 gspca_dev->capt_file = NULL;
938 gspca_dev->memory = GSPCA_MEMORY_NO;
939 }
940 file->private_data = NULL;
941 module_put(gspca_dev->module);
942 mutex_unlock(&gspca_dev->queue_lock);
943
944 PDEBUG(D_STREAM, "close done");
945
946 return 0;
947 }
948
949 static int vidioc_querycap(struct file *file, void *priv,
950 struct v4l2_capability *cap)
951 {
952 struct gspca_dev *gspca_dev = priv;
953 int ret;
954
955 /* protect the access to the usb device */
956 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
957 return -ERESTARTSYS;
958 if (!gspca_dev->present) {
959 ret = -ENODEV;
960 goto out;
961 }
962 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
963 if (gspca_dev->dev->product != NULL) {
964 strncpy(cap->card, gspca_dev->dev->product,
965 sizeof cap->card);
966 } else {
967 snprintf(cap->card, sizeof cap->card,
968 "USB Camera (%04x:%04x)",
969 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
970 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
971 }
972 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
973 cap->version = DRIVER_VERSION_NUMBER;
974 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
975 | V4L2_CAP_STREAMING
976 | V4L2_CAP_READWRITE;
977 ret = 0;
978 out:
979 mutex_unlock(&gspca_dev->usb_lock);
980 return ret;
981 }
982
983 static int vidioc_queryctrl(struct file *file, void *priv,
984 struct v4l2_queryctrl *q_ctrl)
985 {
986 struct gspca_dev *gspca_dev = priv;
987 int i, ix;
988 u32 id;
989
990 ix = -1;
991 id = q_ctrl->id;
992 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
993 id &= V4L2_CTRL_ID_MASK;
994 id++;
995 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
996 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
997 continue;
998 if (ix < 0) {
999 ix = i;
1000 continue;
1001 }
1002 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1003 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1004 continue;
1005 ix = i;
1006 }
1007 }
1008 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1009 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1010 ix = i;
1011 break;
1012 }
1013 }
1014 if (ix < 0)
1015 return -EINVAL;
1016 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1017 sizeof *q_ctrl);
1018 if (gspca_dev->ctrl_dis & (1 << ix))
1019 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1020 return 0;
1021 }
1022
1023 static int vidioc_s_ctrl(struct file *file, void *priv,
1024 struct v4l2_control *ctrl)
1025 {
1026 struct gspca_dev *gspca_dev = priv;
1027 const struct ctrl *ctrls;
1028 int i, ret;
1029
1030 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1031 i < gspca_dev->sd_desc->nctrls;
1032 i++, ctrls++) {
1033 if (ctrl->id != ctrls->qctrl.id)
1034 continue;
1035 if (gspca_dev->ctrl_dis & (1 << i))
1036 return -EINVAL;
1037 if (ctrl->value < ctrls->qctrl.minimum
1038 || ctrl->value > ctrls->qctrl.maximum)
1039 return -ERANGE;
1040 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1041 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1042 return -ERESTARTSYS;
1043 if (gspca_dev->present)
1044 ret = ctrls->set(gspca_dev, ctrl->value);
1045 else
1046 ret = -ENODEV;
1047 mutex_unlock(&gspca_dev->usb_lock);
1048 return ret;
1049 }
1050 return -EINVAL;
1051 }
1052
1053 static int vidioc_g_ctrl(struct file *file, void *priv,
1054 struct v4l2_control *ctrl)
1055 {
1056 struct gspca_dev *gspca_dev = priv;
1057
1058 const struct ctrl *ctrls;
1059 int i, ret;
1060
1061 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1062 i < gspca_dev->sd_desc->nctrls;
1063 i++, ctrls++) {
1064 if (ctrl->id != ctrls->qctrl.id)
1065 continue;
1066 if (gspca_dev->ctrl_dis & (1 << i))
1067 return -EINVAL;
1068 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1069 return -ERESTARTSYS;
1070 if (gspca_dev->present)
1071 ret = ctrls->get(gspca_dev, &ctrl->value);
1072 else
1073 ret = -ENODEV;
1074 mutex_unlock(&gspca_dev->usb_lock);
1075 return ret;
1076 }
1077 return -EINVAL;
1078 }
1079
1080 /*fixme: have an audio flag in gspca_dev?*/
1081 static int vidioc_s_audio(struct file *file, void *priv,
1082 struct v4l2_audio *audio)
1083 {
1084 if (audio->index != 0)
1085 return -EINVAL;
1086 return 0;
1087 }
1088
1089 static int vidioc_g_audio(struct file *file, void *priv,
1090 struct v4l2_audio *audio)
1091 {
1092 strcpy(audio->name, "Microphone");
1093 return 0;
1094 }
1095
1096 static int vidioc_enumaudio(struct file *file, void *priv,
1097 struct v4l2_audio *audio)
1098 {
1099 if (audio->index != 0)
1100 return -EINVAL;
1101
1102 strcpy(audio->name, "Microphone");
1103 audio->capability = 0;
1104 audio->mode = 0;
1105 return 0;
1106 }
1107
1108 static int vidioc_querymenu(struct file *file, void *priv,
1109 struct v4l2_querymenu *qmenu)
1110 {
1111 struct gspca_dev *gspca_dev = priv;
1112
1113 if (!gspca_dev->sd_desc->querymenu)
1114 return -EINVAL;
1115 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1116 }
1117
1118 static int vidioc_enum_input(struct file *file, void *priv,
1119 struct v4l2_input *input)
1120 {
1121 struct gspca_dev *gspca_dev = priv;
1122
1123 if (input->index != 0)
1124 return -EINVAL;
1125 input->type = V4L2_INPUT_TYPE_CAMERA;
1126 input->status = gspca_dev->cam.input_flags;
1127 strncpy(input->name, gspca_dev->sd_desc->name,
1128 sizeof input->name);
1129 return 0;
1130 }
1131
1132 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1133 {
1134 *i = 0;
1135 return 0;
1136 }
1137
1138 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1139 {
1140 if (i > 0)
1141 return -EINVAL;
1142 return (0);
1143 }
1144
1145 static int vidioc_reqbufs(struct file *file, void *priv,
1146 struct v4l2_requestbuffers *rb)
1147 {
1148 struct gspca_dev *gspca_dev = priv;
1149 int i, ret = 0;
1150
1151 switch (rb->memory) {
1152 case GSPCA_MEMORY_READ: /* (internal call) */
1153 case V4L2_MEMORY_MMAP:
1154 case V4L2_MEMORY_USERPTR:
1155 break;
1156 default:
1157 return -EINVAL;
1158 }
1159 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1160 return -ERESTARTSYS;
1161
1162 if (gspca_dev->memory != GSPCA_MEMORY_NO
1163 && gspca_dev->memory != rb->memory) {
1164 ret = -EBUSY;
1165 goto out;
1166 }
1167
1168 /* only one file may do the capture */
1169 if (gspca_dev->capt_file != NULL
1170 && gspca_dev->capt_file != file) {
1171 ret = -EBUSY;
1172 goto out;
1173 }
1174
1175 /* if allocated, the buffers must not be mapped */
1176 for (i = 0; i < gspca_dev->nframes; i++) {
1177 if (gspca_dev->frame[i].vma_use_count) {
1178 ret = -EBUSY;
1179 goto out;
1180 }
1181 }
1182
1183 /* stop streaming */
1184 if (gspca_dev->streaming) {
1185 mutex_lock(&gspca_dev->usb_lock);
1186 gspca_stream_off(gspca_dev);
1187 mutex_unlock(&gspca_dev->usb_lock);
1188 }
1189
1190 /* free the previous allocated buffers, if any */
1191 if (gspca_dev->nframes != 0) {
1192 frame_free(gspca_dev);
1193 gspca_dev->capt_file = NULL;
1194 }
1195 if (rb->count == 0) /* unrequest */
1196 goto out;
1197 gspca_dev->memory = rb->memory;
1198 ret = frame_alloc(gspca_dev, rb->count);
1199 if (ret == 0) {
1200 rb->count = gspca_dev->nframes;
1201 gspca_dev->capt_file = file;
1202 }
1203 out:
1204 mutex_unlock(&gspca_dev->queue_lock);
1205 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1206 return ret;
1207 }
1208
1209 static int vidioc_querybuf(struct file *file, void *priv,
1210 struct v4l2_buffer *v4l2_buf)
1211 {
1212 struct gspca_dev *gspca_dev = priv;
1213 struct gspca_frame *frame;
1214
1215 if (v4l2_buf->index < 0
1216 || v4l2_buf->index >= gspca_dev->nframes)
1217 return -EINVAL;
1218
1219 frame = &gspca_dev->frame[v4l2_buf->index];
1220 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1221 return 0;
1222 }
1223
1224 static int vidioc_streamon(struct file *file, void *priv,
1225 enum v4l2_buf_type buf_type)
1226 {
1227 struct gspca_dev *gspca_dev = priv;
1228 int ret;
1229
1230 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1231 return -EINVAL;
1232 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1233 return -ERESTARTSYS;
1234
1235 if (gspca_dev->nframes == 0
1236 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1237 ret = -EINVAL;
1238 goto out;
1239 }
1240 if (!gspca_dev->streaming) {
1241 ret = gspca_init_transfer(gspca_dev);
1242 if (ret < 0)
1243 goto out;
1244 }
1245 #ifdef GSPCA_DEBUG
1246 if (gspca_debug & D_STREAM) {
1247 PDEBUG_MODE("stream on OK",
1248 gspca_dev->pixfmt,
1249 gspca_dev->width,
1250 gspca_dev->height);
1251 }
1252 #endif
1253 ret = 0;
1254 out:
1255 mutex_unlock(&gspca_dev->queue_lock);
1256 return ret;
1257 }
1258
1259 static int vidioc_streamoff(struct file *file, void *priv,
1260 enum v4l2_buf_type buf_type)
1261 {
1262 struct gspca_dev *gspca_dev = priv;
1263 int i, ret;
1264
1265 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1266 return -EINVAL;
1267 if (!gspca_dev->streaming)
1268 return 0;
1269 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1270 return -ERESTARTSYS;
1271
1272 /* stop streaming */
1273 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1274 ret = -ERESTARTSYS;
1275 goto out;
1276 }
1277 gspca_stream_off(gspca_dev);
1278 mutex_unlock(&gspca_dev->usb_lock);
1279
1280 /* empty the application queues */
1281 for (i = 0; i < gspca_dev->nframes; i++)
1282 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1283 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1284 gspca_dev->last_packet_type = DISCARD_PACKET;
1285 gspca_dev->sequence = 0;
1286 ret = 0;
1287 out:
1288 mutex_unlock(&gspca_dev->queue_lock);
1289 return ret;
1290 }
1291
1292 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1293 struct v4l2_jpegcompression *jpegcomp)
1294 {
1295 struct gspca_dev *gspca_dev = priv;
1296 int ret;
1297
1298 if (!gspca_dev->sd_desc->get_jcomp)
1299 return -EINVAL;
1300 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1301 return -ERESTARTSYS;
1302 if (gspca_dev->present)
1303 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1304 else
1305 ret = -ENODEV;
1306 mutex_unlock(&gspca_dev->usb_lock);
1307 return ret;
1308 }
1309
1310 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1311 struct v4l2_jpegcompression *jpegcomp)
1312 {
1313 struct gspca_dev *gspca_dev = priv;
1314 int ret;
1315
1316 if (!gspca_dev->sd_desc->set_jcomp)
1317 return -EINVAL;
1318 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1319 return -ERESTARTSYS;
1320 if (gspca_dev->present)
1321 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1322 else
1323 ret = -ENODEV;
1324 mutex_unlock(&gspca_dev->usb_lock);
1325 return ret;
1326 }
1327
1328 static int vidioc_g_parm(struct file *filp, void *priv,
1329 struct v4l2_streamparm *parm)
1330 {
1331 struct gspca_dev *gspca_dev = priv;
1332
1333 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1334
1335 if (gspca_dev->sd_desc->get_streamparm) {
1336 int ret;
1337
1338 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1339 return -ERESTARTSYS;
1340 if (gspca_dev->present)
1341 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1342 parm);
1343 else
1344 ret = -ENODEV;
1345 mutex_unlock(&gspca_dev->usb_lock);
1346 return ret;
1347 }
1348
1349 return 0;
1350 }
1351
1352 static int vidioc_s_parm(struct file *filp, void *priv,
1353 struct v4l2_streamparm *parm)
1354 {
1355 struct gspca_dev *gspca_dev = priv;
1356 int n;
1357
1358 n = parm->parm.capture.readbuffers;
1359 if (n == 0 || n > GSPCA_MAX_FRAMES)
1360 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1361 else
1362 gspca_dev->nbufread = n;
1363
1364 if (gspca_dev->sd_desc->set_streamparm) {
1365 int ret;
1366
1367 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1368 return -ERESTARTSYS;
1369 if (gspca_dev->present)
1370 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1371 parm);
1372 else
1373 ret = -ENODEV;
1374 mutex_unlock(&gspca_dev->usb_lock);
1375 return ret;
1376 }
1377
1378 return 0;
1379 }
1380
1381 static int vidioc_s_std(struct file *filp, void *priv,
1382 v4l2_std_id *parm)
1383 {
1384 return 0;
1385 }
1386
1387 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1388 static int vidiocgmbuf(struct file *file, void *priv,
1389 struct video_mbuf *mbuf)
1390 {
1391 struct gspca_dev *gspca_dev = file->private_data;
1392 int i;
1393
1394 PDEBUG(D_STREAM, "cgmbuf");
1395 if (gspca_dev->nframes == 0) {
1396 int ret;
1397
1398 {
1399 struct v4l2_format fmt;
1400
1401 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1402 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1403 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1404 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1405 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1406 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1407 if (ret != 0)
1408 return ret;
1409 }
1410 {
1411 struct v4l2_requestbuffers rb;
1412
1413 memset(&rb, 0, sizeof rb);
1414 rb.count = 4;
1415 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1416 rb.memory = V4L2_MEMORY_MMAP;
1417 ret = vidioc_reqbufs(file, priv, &rb);
1418 if (ret != 0)
1419 return ret;
1420 }
1421 }
1422 mbuf->frames = gspca_dev->nframes;
1423 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1424 for (i = 0; i < mbuf->frames; i++)
1425 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1426 return 0;
1427 }
1428 #endif
1429
1430 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1431 {
1432 struct gspca_dev *gspca_dev = file->private_data;
1433 struct gspca_frame *frame;
1434 struct page *page;
1435 unsigned long addr, start, size;
1436 int i, ret;
1437
1438 start = vma->vm_start;
1439 size = vma->vm_end - vma->vm_start;
1440 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1441
1442 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1443 return -ERESTARTSYS;
1444 if (!gspca_dev->present) {
1445 ret = -ENODEV;
1446 goto out;
1447 }
1448 if (gspca_dev->capt_file != file) {
1449 ret = -EINVAL;
1450 goto out;
1451 }
1452
1453 frame = NULL;
1454 for (i = 0; i < gspca_dev->nframes; ++i) {
1455 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1456 PDEBUG(D_STREAM, "mmap bad memory type");
1457 break;
1458 }
1459 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1460 == vma->vm_pgoff) {
1461 frame = &gspca_dev->frame[i];
1462 break;
1463 }
1464 }
1465 if (frame == NULL) {
1466 PDEBUG(D_STREAM, "mmap no frame buffer found");
1467 ret = -EINVAL;
1468 goto out;
1469 }
1470 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1471 /* v4l1 maps all the buffers */
1472 if (i != 0
1473 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1474 #endif
1475 if (size != frame->v4l2_buf.length) {
1476 PDEBUG(D_STREAM, "mmap bad size");
1477 ret = -EINVAL;
1478 goto out;
1479 }
1480
1481 /*
1482 * - VM_IO marks the area as being a mmaped region for I/O to a
1483 * device. It also prevents the region from being core dumped.
1484 */
1485 vma->vm_flags |= VM_IO;
1486
1487 addr = (unsigned long) frame->data;
1488 while (size > 0) {
1489 page = vmalloc_to_page((void *) addr);
1490 ret = vm_insert_page(vma, start, page);
1491 if (ret < 0)
1492 goto out;
1493 start += PAGE_SIZE;
1494 addr += PAGE_SIZE;
1495 size -= PAGE_SIZE;
1496 }
1497
1498 vma->vm_ops = &gspca_vm_ops;
1499 vma->vm_private_data = frame;
1500 gspca_vm_open(vma);
1501 ret = 0;
1502 out:
1503 mutex_unlock(&gspca_dev->queue_lock);
1504 return ret;
1505 }
1506
1507 /*
1508 * wait for a video frame
1509 *
1510 * If a frame is ready, its index is returned.
1511 */
1512 static int frame_wait(struct gspca_dev *gspca_dev,
1513 int nonblock_ing)
1514 {
1515 struct gspca_frame *frame;
1516 int i, j, ret;
1517
1518 /* check if a frame is ready */
1519 i = gspca_dev->fr_o;
1520 j = gspca_dev->fr_queue[i];
1521 frame = &gspca_dev->frame[j];
1522
1523 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1524 if (nonblock_ing)
1525 return -EAGAIN;
1526
1527 /* wait till a frame is ready */
1528 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1529 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1530 !gspca_dev->streaming || !gspca_dev->present,
1531 msecs_to_jiffies(3000));
1532 if (ret < 0)
1533 return ret;
1534 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1535 return -EIO;
1536 }
1537
1538 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1539 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1540 gspca_dev->fr_q,
1541 gspca_dev->fr_i,
1542 gspca_dev->fr_o);
1543
1544 if (gspca_dev->sd_desc->dq_callback) {
1545 mutex_lock(&gspca_dev->usb_lock);
1546 if (gspca_dev->present)
1547 gspca_dev->sd_desc->dq_callback(gspca_dev);
1548 mutex_unlock(&gspca_dev->usb_lock);
1549 }
1550 return j;
1551 }
1552
1553 /*
1554 * dequeue a video buffer
1555 *
1556 * If nonblock_ing is false, block until a buffer is available.
1557 */
1558 static int vidioc_dqbuf(struct file *file, void *priv,
1559 struct v4l2_buffer *v4l2_buf)
1560 {
1561 struct gspca_dev *gspca_dev = priv;
1562 struct gspca_frame *frame;
1563 int i, ret;
1564
1565 PDEBUG(D_FRAM, "dqbuf");
1566 if (v4l2_buf->memory != gspca_dev->memory)
1567 return -EINVAL;
1568
1569 if (!gspca_dev->present)
1570 return -ENODEV;
1571
1572 /* if not streaming, be sure the application will not loop forever */
1573 if (!(file->f_flags & O_NONBLOCK)
1574 && !gspca_dev->streaming && gspca_dev->users == 1)
1575 return -EINVAL;
1576
1577 /* only the capturing file may dequeue */
1578 if (gspca_dev->capt_file != file)
1579 return -EINVAL;
1580
1581 /* only one dequeue / read at a time */
1582 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1583 return -ERESTARTSYS;
1584
1585 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1586 if (ret < 0)
1587 goto out;
1588 i = ret; /* frame index */
1589 frame = &gspca_dev->frame[i];
1590 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1591 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1592 frame->data,
1593 frame->v4l2_buf.bytesused)) {
1594 PDEBUG(D_ERR|D_STREAM,
1595 "dqbuf cp to user failed");
1596 ret = -EFAULT;
1597 goto out;
1598 }
1599 }
1600 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1601 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1602 PDEBUG(D_FRAM, "dqbuf %d", i);
1603 ret = 0;
1604 out:
1605 mutex_unlock(&gspca_dev->read_lock);
1606 return ret;
1607 }
1608
1609 /*
1610 * queue a video buffer
1611 *
1612 * Attempting to queue a buffer that has already been
1613 * queued will return -EINVAL.
1614 */
1615 static int vidioc_qbuf(struct file *file, void *priv,
1616 struct v4l2_buffer *v4l2_buf)
1617 {
1618 struct gspca_dev *gspca_dev = priv;
1619 struct gspca_frame *frame;
1620 int i, index, ret;
1621
1622 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1623
1624 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1625 return -ERESTARTSYS;
1626
1627 index = v4l2_buf->index;
1628 if ((unsigned) index >= gspca_dev->nframes) {
1629 PDEBUG(D_FRAM,
1630 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1631 ret = -EINVAL;
1632 goto out;
1633 }
1634 if (v4l2_buf->memory != gspca_dev->memory) {
1635 PDEBUG(D_FRAM, "qbuf bad memory type");
1636 ret = -EINVAL;
1637 goto out;
1638 }
1639
1640 frame = &gspca_dev->frame[index];
1641 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1642 PDEBUG(D_FRAM, "qbuf bad state");
1643 ret = -EINVAL;
1644 goto out;
1645 }
1646
1647 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1648
1649 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1650 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1651 frame->v4l2_buf.length = v4l2_buf->length;
1652 }
1653
1654 /* put the buffer in the 'queued' queue */
1655 i = gspca_dev->fr_q;
1656 gspca_dev->fr_queue[i] = index;
1657 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1658 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1659 gspca_dev->fr_q,
1660 gspca_dev->fr_i,
1661 gspca_dev->fr_o);
1662
1663 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1664 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1665 ret = 0;
1666 out:
1667 mutex_unlock(&gspca_dev->queue_lock);
1668 return ret;
1669 }
1670
1671 /*
1672 * allocate the resources for read()
1673 */
1674 static int read_alloc(struct gspca_dev *gspca_dev,
1675 struct file *file)
1676 {
1677 struct v4l2_buffer v4l2_buf;
1678 int i, ret;
1679
1680 PDEBUG(D_STREAM, "read alloc");
1681 if (gspca_dev->nframes == 0) {
1682 struct v4l2_requestbuffers rb;
1683
1684 memset(&rb, 0, sizeof rb);
1685 rb.count = gspca_dev->nbufread;
1686 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1687 rb.memory = GSPCA_MEMORY_READ;
1688 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1689 if (ret != 0) {
1690 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1691 return ret;
1692 }
1693 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1694 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1695 v4l2_buf.memory = GSPCA_MEMORY_READ;
1696 for (i = 0; i < gspca_dev->nbufread; i++) {
1697 v4l2_buf.index = i;
1698 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1699 if (ret != 0) {
1700 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1701 return ret;
1702 }
1703 }
1704 gspca_dev->memory = GSPCA_MEMORY_READ;
1705 }
1706
1707 /* start streaming */
1708 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1709 if (ret != 0)
1710 PDEBUG(D_STREAM, "read streamon err %d", ret);
1711 return ret;
1712 }
1713
1714 static unsigned int dev_poll(struct file *file, poll_table *wait)
1715 {
1716 struct gspca_dev *gspca_dev = file->private_data;
1717 int i, ret;
1718
1719 PDEBUG(D_FRAM, "poll");
1720
1721 poll_wait(file, &gspca_dev->wq, wait);
1722
1723 /* if reqbufs is not done, the user would use read() */
1724 if (gspca_dev->nframes == 0) {
1725 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1726 return POLLERR; /* not the 1st time */
1727 ret = read_alloc(gspca_dev, file);
1728 if (ret != 0)
1729 return POLLERR;
1730 }
1731
1732 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1733 return POLLERR;
1734
1735 /* check the next incoming buffer */
1736 i = gspca_dev->fr_o;
1737 i = gspca_dev->fr_queue[i];
1738 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1739 ret = POLLIN | POLLRDNORM; /* something to read */
1740 else
1741 ret = 0;
1742 mutex_unlock(&gspca_dev->queue_lock);
1743 if (!gspca_dev->present)
1744 return POLLHUP;
1745 return ret;
1746 }
1747
1748 static ssize_t dev_read(struct file *file, char __user *data,
1749 size_t count, loff_t *ppos)
1750 {
1751 struct gspca_dev *gspca_dev = file->private_data;
1752 struct gspca_frame *frame;
1753 struct v4l2_buffer v4l2_buf;
1754 struct timeval timestamp;
1755 int n, ret, ret2;
1756
1757 PDEBUG(D_FRAM, "read (%zd)", count);
1758 if (!gspca_dev->present)
1759 return -ENODEV;
1760 switch (gspca_dev->memory) {
1761 case GSPCA_MEMORY_NO: /* first time */
1762 ret = read_alloc(gspca_dev, file);
1763 if (ret != 0)
1764 return ret;
1765 break;
1766 case GSPCA_MEMORY_READ:
1767 if (gspca_dev->capt_file == file)
1768 break;
1769 /* fall thru */
1770 default:
1771 return -EINVAL;
1772 }
1773
1774 /* get a frame */
1775 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1776 timestamp.tv_sec--;
1777 n = 2;
1778 for (;;) {
1779 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1780 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1781 v4l2_buf.memory = GSPCA_MEMORY_READ;
1782 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1783 if (ret != 0) {
1784 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1785 return ret;
1786 }
1787
1788 /* if the process slept for more than 1 second,
1789 * get a newer frame */
1790 frame = &gspca_dev->frame[v4l2_buf.index];
1791 if (--n < 0)
1792 break; /* avoid infinite loop */
1793 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1794 break;
1795 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1796 if (ret != 0) {
1797 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1798 return ret;
1799 }
1800 }
1801
1802 /* copy the frame */
1803 if (count > frame->v4l2_buf.bytesused)
1804 count = frame->v4l2_buf.bytesused;
1805 ret = copy_to_user(data, frame->data, count);
1806 if (ret != 0) {
1807 PDEBUG(D_ERR|D_STREAM,
1808 "read cp to user lack %d / %zd", ret, count);
1809 ret = -EFAULT;
1810 goto out;
1811 }
1812 ret = count;
1813 out:
1814 /* in each case, requeue the buffer */
1815 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1816 if (ret2 != 0)
1817 return ret2;
1818 return ret;
1819 }
1820
1821 static struct v4l2_file_operations dev_fops = {
1822 .owner = THIS_MODULE,
1823 .open = dev_open,
1824 .release = dev_close,
1825 .read = dev_read,
1826 .mmap = dev_mmap,
1827 .unlocked_ioctl = video_ioctl2,
1828 .poll = dev_poll,
1829 };
1830
1831 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1832 .vidioc_querycap = vidioc_querycap,
1833 .vidioc_dqbuf = vidioc_dqbuf,
1834 .vidioc_qbuf = vidioc_qbuf,
1835 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1836 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1837 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1838 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1839 .vidioc_streamon = vidioc_streamon,
1840 .vidioc_queryctrl = vidioc_queryctrl,
1841 .vidioc_g_ctrl = vidioc_g_ctrl,
1842 .vidioc_s_ctrl = vidioc_s_ctrl,
1843 .vidioc_g_audio = vidioc_g_audio,
1844 .vidioc_s_audio = vidioc_s_audio,
1845 .vidioc_enumaudio = vidioc_enumaudio,
1846 .vidioc_querymenu = vidioc_querymenu,
1847 .vidioc_enum_input = vidioc_enum_input,
1848 .vidioc_g_input = vidioc_g_input,
1849 .vidioc_s_input = vidioc_s_input,
1850 .vidioc_reqbufs = vidioc_reqbufs,
1851 .vidioc_querybuf = vidioc_querybuf,
1852 .vidioc_streamoff = vidioc_streamoff,
1853 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1854 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1855 .vidioc_g_parm = vidioc_g_parm,
1856 .vidioc_s_parm = vidioc_s_parm,
1857 .vidioc_s_std = vidioc_s_std,
1858 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1859 .vidiocgmbuf = vidiocgmbuf,
1860 #endif
1861 };
1862
1863 static struct video_device gspca_template = {
1864 .name = "gspca main driver",
1865 .fops = &dev_fops,
1866 .ioctl_ops = &dev_ioctl_ops,
1867 .release = gspca_release,
1868 .minor = -1,
1869 };
1870
1871 /*
1872 * probe and create a new gspca device
1873 *
1874 * This function must be called by the sub-driver when it is
1875 * called for probing a new device.
1876 */
1877 int gspca_dev_probe(struct usb_interface *intf,
1878 const struct usb_device_id *id,
1879 const struct sd_desc *sd_desc,
1880 int dev_size,
1881 struct module *module)
1882 {
1883 struct usb_interface_descriptor *interface;
1884 struct gspca_dev *gspca_dev;
1885 struct usb_device *dev = interface_to_usbdev(intf);
1886 int ret;
1887
1888 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1889
1890 /* we don't handle multi-config cameras */
1891 if (dev->descriptor.bNumConfigurations != 1)
1892 return -ENODEV;
1893 interface = &intf->cur_altsetting->desc;
1894 if (interface->bInterfaceNumber > 0)
1895 return -ENODEV;
1896
1897 /* create the device */
1898 if (dev_size < sizeof *gspca_dev)
1899 dev_size = sizeof *gspca_dev;
1900 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1901 if (!gspca_dev) {
1902 err("couldn't kzalloc gspca struct");
1903 return -ENOMEM;
1904 }
1905 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1906 if (!gspca_dev->usb_buf) {
1907 err("out of memory");
1908 ret = -ENOMEM;
1909 goto out;
1910 }
1911 gspca_dev->dev = dev;
1912 gspca_dev->iface = interface->bInterfaceNumber;
1913 gspca_dev->nbalt = intf->num_altsetting;
1914 gspca_dev->sd_desc = sd_desc;
1915 gspca_dev->nbufread = 2;
1916 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1917
1918 /* configure the subdriver and initialize the USB device */
1919 ret = sd_desc->config(gspca_dev, id);
1920 if (ret < 0)
1921 goto out;
1922 ret = sd_desc->init(gspca_dev);
1923 if (ret < 0)
1924 goto out;
1925 ret = gspca_set_alt0(gspca_dev);
1926 if (ret < 0)
1927 goto out;
1928 gspca_set_default_mode(gspca_dev);
1929
1930 mutex_init(&gspca_dev->usb_lock);
1931 mutex_init(&gspca_dev->read_lock);
1932 mutex_init(&gspca_dev->queue_lock);
1933 init_waitqueue_head(&gspca_dev->wq);
1934
1935 /* init video stuff */
1936 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1937 gspca_dev->vdev.parent = &intf->dev;
1938 gspca_dev->module = module;
1939 gspca_dev->present = 1;
1940 ret = video_register_device(&gspca_dev->vdev,
1941 VFL_TYPE_GRABBER,
1942 -1);
1943 if (ret < 0) {
1944 err("video_register_device err %d", ret);
1945 goto out;
1946 }
1947
1948 usb_set_intfdata(intf, gspca_dev);
1949 PDEBUG(D_PROBE, "probe ok");
1950 return 0;
1951 out:
1952 kfree(gspca_dev->usb_buf);
1953 kfree(gspca_dev);
1954 return ret;
1955 }
1956 EXPORT_SYMBOL(gspca_dev_probe);
1957
1958 /*
1959 * USB disconnection
1960 *
1961 * This function must be called by the sub-driver
1962 * when the device disconnects, after the specific resources are freed.
1963 */
1964 void gspca_disconnect(struct usb_interface *intf)
1965 {
1966 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1967
1968 mutex_lock(&gspca_dev->usb_lock);
1969 gspca_dev->present = 0;
1970
1971 if (gspca_dev->streaming) {
1972 destroy_urbs(gspca_dev);
1973 wake_up_interruptible(&gspca_dev->wq);
1974 }
1975
1976 /* the device is freed at exit of this function */
1977 gspca_dev->dev = NULL;
1978 mutex_unlock(&gspca_dev->usb_lock);
1979
1980 usb_set_intfdata(intf, NULL);
1981
1982 /* release the device */
1983 /* (this will call gspca_release() immediatly or on last close) */
1984 video_unregister_device(&gspca_dev->vdev);
1985
1986 PDEBUG(D_PROBE, "disconnect complete");
1987 }
1988 EXPORT_SYMBOL(gspca_disconnect);
1989
1990 #ifdef CONFIG_PM
1991 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1992 {
1993 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1994
1995 if (!gspca_dev->streaming)
1996 return 0;
1997 gspca_dev->frozen = 1; /* avoid urb error messages */
1998 if (gspca_dev->sd_desc->stopN)
1999 gspca_dev->sd_desc->stopN(gspca_dev);
2000 destroy_urbs(gspca_dev);
2001 gspca_set_alt0(gspca_dev);
2002 if (gspca_dev->sd_desc->stop0)
2003 gspca_dev->sd_desc->stop0(gspca_dev);
2004 return 0;
2005 }
2006 EXPORT_SYMBOL(gspca_suspend);
2007
2008 int gspca_resume(struct usb_interface *intf)
2009 {
2010 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2011
2012 gspca_dev->frozen = 0;
2013 gspca_dev->sd_desc->init(gspca_dev);
2014 if (gspca_dev->streaming)
2015 return gspca_init_transfer(gspca_dev);
2016 return 0;
2017 }
2018 EXPORT_SYMBOL(gspca_resume);
2019 #endif
2020 /* -- cam driver utility functions -- */
2021
2022 /* auto gain and exposure algorithm based on the knee algorithm described here:
2023 http://ytse.tricolour.net/docs/LowLightOptimization.html
2024
2025 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2026 where changed. */
2027 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2028 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2029 {
2030 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2031 const struct ctrl *gain_ctrl = NULL;
2032 const struct ctrl *exposure_ctrl = NULL;
2033 const struct ctrl *autogain_ctrl = NULL;
2034 int retval = 0;
2035
2036 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2037 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2038 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2039 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2040 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2041 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2042 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2043 }
2044 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2045 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2046 "on cam without (auto)gain/exposure");
2047 return 0;
2048 }
2049
2050 if (gain_ctrl->get(gspca_dev, &gain) ||
2051 exposure_ctrl->get(gspca_dev, &exposure) ||
2052 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2053 return 0;
2054
2055 orig_gain = gain;
2056 orig_exposure = exposure;
2057
2058 /* If we are of a multiple of deadzone, do multiple steps to reach the
2059 desired lumination fast (with the risc of a slight overshoot) */
2060 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2061
2062 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2063 avg_lum, desired_avg_lum, steps);
2064
2065 for (i = 0; i < steps; i++) {
2066 if (avg_lum > desired_avg_lum) {
2067 if (gain > gain_knee)
2068 gain--;
2069 else if (exposure > exposure_knee)
2070 exposure--;
2071 else if (gain > gain_ctrl->qctrl.default_value)
2072 gain--;
2073 else if (exposure > exposure_ctrl->qctrl.minimum)
2074 exposure--;
2075 else if (gain > gain_ctrl->qctrl.minimum)
2076 gain--;
2077 else
2078 break;
2079 } else {
2080 if (gain < gain_ctrl->qctrl.default_value)
2081 gain++;
2082 else if (exposure < exposure_knee)
2083 exposure++;
2084 else if (gain < gain_knee)
2085 gain++;
2086 else if (exposure < exposure_ctrl->qctrl.maximum)
2087 exposure++;
2088 else if (gain < gain_ctrl->qctrl.maximum)
2089 gain++;
2090 else
2091 break;
2092 }
2093 }
2094
2095 if (gain != orig_gain) {
2096 gain_ctrl->set(gspca_dev, gain);
2097 retval = 1;
2098 }
2099 if (exposure != orig_exposure) {
2100 exposure_ctrl->set(gspca_dev, exposure);
2101 retval = 1;
2102 }
2103
2104 return retval;
2105 }
2106 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2107
2108 /* -- module insert / remove -- */
2109 static int __init gspca_init(void)
2110 {
2111 info("main v%d.%d.%d registered",
2112 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2113 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2114 DRIVER_VERSION_NUMBER & 0xff);
2115 return 0;
2116 }
2117 static void __exit gspca_exit(void)
2118 {
2119 info("main deregistered");
2120 }
2121
2122 module_init(gspca_init);
2123 module_exit(gspca_exit);
2124
2125 #ifdef GSPCA_DEBUG
2126 module_param_named(debug, gspca_debug, int, 0644);
2127 MODULE_PARM_DESC(debug,
2128 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2129 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2130 " 0x0100: v4l2");
2131 #endif
Verdex Pro support