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[mirror_ubuntu-artful-kernel.git] / drivers / media / video / gspca / gspca.c
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, 8, 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 be 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 const 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 u8 *data; /* address of data in the iso message */
130 int i, len, st;
131 cam_pkt_op pkt_scan;
132
133 if (urb->status != 0) {
134 if (urb->status == -ESHUTDOWN)
135 return; /* disconnection */
136 #ifdef CONFIG_PM
137 if (gspca_dev->frozen)
138 return;
139 #endif
140 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
141 urb->status = 0;
142 goto resubmit;
143 }
144 pkt_scan = gspca_dev->sd_desc->pkt_scan;
145 for (i = 0; i < urb->number_of_packets; i++) {
146
147 /* check the packet status and length */
148 len = urb->iso_frame_desc[i].actual_length;
149 if (len == 0) {
150 if (gspca_dev->empty_packet == 0)
151 gspca_dev->empty_packet = 1;
152 continue;
153 }
154 st = urb->iso_frame_desc[i].status;
155 if (st) {
156 PDEBUG(D_ERR,
157 "ISOC data error: [%d] len=%d, status=%d",
158 i, len, st);
159 gspca_dev->last_packet_type = DISCARD_PACKET;
160 continue;
161 }
162
163 /* let the packet be analyzed by the subdriver */
164 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
165 i, urb->iso_frame_desc[i].offset, len);
166 data = (u8 *) urb->transfer_buffer
167 + urb->iso_frame_desc[i].offset;
168 pkt_scan(gspca_dev, data, len);
169 }
170
171 resubmit:
172 /* resubmit the URB */
173 st = usb_submit_urb(urb, GFP_ATOMIC);
174 if (st < 0)
175 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
176 }
177
178 /*
179 * ISOC message interrupt from the USB device
180 *
181 * Analyse each packet and call the subdriver for copy to the frame buffer.
182 */
183 static void isoc_irq(struct urb *urb)
184 {
185 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
186
187 PDEBUG(D_PACK, "isoc irq");
188 if (!gspca_dev->streaming)
189 return;
190 fill_frame(gspca_dev, urb);
191 }
192
193 /*
194 * bulk message interrupt from the USB device
195 */
196 static void bulk_irq(struct urb *urb)
197 {
198 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
199 int st;
200
201 PDEBUG(D_PACK, "bulk irq");
202 if (!gspca_dev->streaming)
203 return;
204 switch (urb->status) {
205 case 0:
206 break;
207 case -ESHUTDOWN:
208 return; /* disconnection */
209 default:
210 #ifdef CONFIG_PM
211 if (gspca_dev->frozen)
212 return;
213 #endif
214 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
215 urb->status = 0;
216 goto resubmit;
217 }
218
219 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
220 gspca_dev->sd_desc->pkt_scan(gspca_dev,
221 urb->transfer_buffer,
222 urb->actual_length);
223
224 resubmit:
225 /* resubmit the URB */
226 if (gspca_dev->cam.bulk_nurbs != 0) {
227 st = usb_submit_urb(urb, GFP_ATOMIC);
228 if (st < 0)
229 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
230 }
231 }
232
233 /*
234 * add data to the current frame
235 *
236 * This function is called by the subdrivers at interrupt level.
237 *
238 * To build a frame, these ones must add
239 * - one FIRST_PACKET
240 * - 0 or many INTER_PACKETs
241 * - one LAST_PACKET
242 * DISCARD_PACKET invalidates the whole frame.
243 * On LAST_PACKET, a new frame is returned.
244 */
245 void gspca_frame_add(struct gspca_dev *gspca_dev,
246 enum gspca_packet_type packet_type,
247 const u8 *data,
248 int len)
249 {
250 struct gspca_frame *frame;
251 int i, j;
252
253 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
254
255 /* check the availability of the frame buffer */
256 frame = gspca_dev->cur_frame;
257 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
258 != V4L2_BUF_FLAG_QUEUED) {
259 gspca_dev->last_packet_type = DISCARD_PACKET;
260 return;
261 }
262
263 /* when start of a new frame, if the current frame buffer
264 * is not queued, discard the whole frame */
265 if (packet_type == FIRST_PACKET) {
266 frame->data_end = frame->data;
267 jiffies_to_timeval(get_jiffies_64(),
268 &frame->v4l2_buf.timestamp);
269 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
270 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
271 if (packet_type == LAST_PACKET)
272 gspca_dev->last_packet_type = packet_type;
273 return;
274 }
275
276 /* append the packet to the frame buffer */
277 if (len > 0) {
278 if (frame->data_end - frame->data + len
279 > frame->v4l2_buf.length) {
280 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
281 frame->data_end - frame->data + len,
282 frame->v4l2_buf.length);
283 packet_type = DISCARD_PACKET;
284 } else {
285 memcpy(frame->data_end, data, len);
286 frame->data_end += len;
287 }
288 }
289 gspca_dev->last_packet_type = packet_type;
290
291 /* if last packet, wake up the application and advance in the queue */
292 if (packet_type == LAST_PACKET) {
293 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
294 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
295 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
296 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
297 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
298 gspca_dev->fr_i = i;
299 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
300 frame->v4l2_buf.bytesused,
301 gspca_dev->fr_q,
302 i,
303 gspca_dev->fr_o);
304 j = gspca_dev->fr_queue[i];
305 gspca_dev->cur_frame = &gspca_dev->frame[j];
306 }
307 }
308 EXPORT_SYMBOL(gspca_frame_add);
309
310 static int gspca_is_compressed(__u32 format)
311 {
312 switch (format) {
313 case V4L2_PIX_FMT_MJPEG:
314 case V4L2_PIX_FMT_JPEG:
315 case V4L2_PIX_FMT_SPCA561:
316 case V4L2_PIX_FMT_PAC207:
317 case V4L2_PIX_FMT_MR97310A:
318 return 1;
319 }
320 return 0;
321 }
322
323 static void *rvmalloc(long size)
324 {
325 void *mem;
326 unsigned long adr;
327
328 mem = vmalloc_32(size);
329 if (mem != NULL) {
330 adr = (unsigned long) mem;
331 while (size > 0) {
332 SetPageReserved(vmalloc_to_page((void *) adr));
333 adr += PAGE_SIZE;
334 size -= PAGE_SIZE;
335 }
336 }
337 return mem;
338 }
339
340 static void rvfree(void *mem, long size)
341 {
342 unsigned long adr;
343
344 adr = (unsigned long) mem;
345 while (size > 0) {
346 ClearPageReserved(vmalloc_to_page((void *) adr));
347 adr += PAGE_SIZE;
348 size -= PAGE_SIZE;
349 }
350 vfree(mem);
351 }
352
353 static int frame_alloc(struct gspca_dev *gspca_dev,
354 unsigned int count)
355 {
356 struct gspca_frame *frame;
357 unsigned int frsz;
358 int i;
359
360 i = gspca_dev->curr_mode;
361 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
362 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
363 frsz = PAGE_ALIGN(frsz);
364 gspca_dev->frsz = frsz;
365 if (count > GSPCA_MAX_FRAMES)
366 count = GSPCA_MAX_FRAMES;
367 gspca_dev->frbuf = rvmalloc(frsz * count);
368 if (!gspca_dev->frbuf) {
369 err("frame alloc failed");
370 return -ENOMEM;
371 }
372 gspca_dev->nframes = count;
373 for (i = 0; i < count; i++) {
374 frame = &gspca_dev->frame[i];
375 frame->v4l2_buf.index = i;
376 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
377 frame->v4l2_buf.flags = 0;
378 frame->v4l2_buf.field = V4L2_FIELD_NONE;
379 frame->v4l2_buf.length = frsz;
380 frame->v4l2_buf.memory = gspca_dev->memory;
381 frame->v4l2_buf.sequence = 0;
382 frame->data = frame->data_end =
383 gspca_dev->frbuf + i * frsz;
384 frame->v4l2_buf.m.offset = i * frsz;
385 }
386 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
387 gspca_dev->cur_frame = &gspca_dev->frame[0];
388 gspca_dev->last_packet_type = DISCARD_PACKET;
389 gspca_dev->sequence = 0;
390 return 0;
391 }
392
393 static void frame_free(struct gspca_dev *gspca_dev)
394 {
395 int i;
396
397 PDEBUG(D_STREAM, "frame free");
398 if (gspca_dev->frbuf != NULL) {
399 rvfree(gspca_dev->frbuf,
400 gspca_dev->nframes * gspca_dev->frsz);
401 gspca_dev->frbuf = NULL;
402 for (i = 0; i < gspca_dev->nframes; i++)
403 gspca_dev->frame[i].data = NULL;
404 }
405 gspca_dev->nframes = 0;
406 }
407
408 static void destroy_urbs(struct gspca_dev *gspca_dev)
409 {
410 struct urb *urb;
411 unsigned int i;
412
413 PDEBUG(D_STREAM, "kill transfer");
414 for (i = 0; i < MAX_NURBS; i++) {
415 urb = gspca_dev->urb[i];
416 if (urb == NULL)
417 break;
418
419 gspca_dev->urb[i] = NULL;
420 usb_kill_urb(urb);
421 if (urb->transfer_buffer != NULL)
422 usb_buffer_free(gspca_dev->dev,
423 urb->transfer_buffer_length,
424 urb->transfer_buffer,
425 urb->transfer_dma);
426 usb_free_urb(urb);
427 }
428 }
429
430 /*
431 * look for an input transfer endpoint in an alternate setting
432 */
433 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
434 int xfer)
435 {
436 struct usb_host_endpoint *ep;
437 int i, attr;
438
439 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
440 ep = &alt->endpoint[i];
441 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
442 if (attr == xfer
443 && ep->desc.wMaxPacketSize != 0)
444 return ep;
445 }
446 return NULL;
447 }
448
449 /*
450 * look for an input (isoc or bulk) endpoint
451 *
452 * The endpoint is defined by the subdriver.
453 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
454 * This routine may be called many times when the bandwidth is too small
455 * (the bandwidth is checked on urb submit).
456 */
457 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
458 {
459 struct usb_interface *intf;
460 struct usb_host_endpoint *ep;
461 int xfer, i, ret;
462
463 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
464 ep = NULL;
465 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
466 : USB_ENDPOINT_XFER_ISOC;
467 i = gspca_dev->alt; /* previous alt setting */
468 if (gspca_dev->cam.reverse_alts) {
469 while (++i < gspca_dev->nbalt) {
470 ep = alt_xfer(&intf->altsetting[i], xfer);
471 if (ep)
472 break;
473 }
474 } else {
475 while (--i >= 0) {
476 ep = alt_xfer(&intf->altsetting[i], xfer);
477 if (ep)
478 break;
479 }
480 }
481 if (ep == NULL) {
482 err("no transfer endpoint found");
483 return NULL;
484 }
485 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
486 i, ep->desc.bEndpointAddress);
487 gspca_dev->alt = i; /* memorize the current alt setting */
488 if (gspca_dev->nbalt > 1) {
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 return ep;
496 }
497
498 /*
499 * create the URBs for image transfer
500 */
501 static int create_urbs(struct gspca_dev *gspca_dev,
502 struct usb_host_endpoint *ep)
503 {
504 struct urb *urb;
505 int n, nurbs, i, psize, npkt, bsize;
506
507 /* calculate the packet size and the number of packets */
508 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
509
510 if (!gspca_dev->cam.bulk) { /* isoc */
511
512 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
513 if (gspca_dev->pkt_size == 0)
514 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
515 else
516 psize = gspca_dev->pkt_size;
517 npkt = gspca_dev->cam.npkt;
518 if (npkt == 0)
519 npkt = 32; /* default value */
520 bsize = psize * npkt;
521 PDEBUG(D_STREAM,
522 "isoc %d pkts size %d = bsize:%d",
523 npkt, psize, bsize);
524 nurbs = DEF_NURBS;
525 } else { /* bulk */
526 npkt = 0;
527 bsize = gspca_dev->cam.bulk_size;
528 if (bsize == 0)
529 bsize = psize;
530 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
531 if (gspca_dev->cam.bulk_nurbs != 0)
532 nurbs = gspca_dev->cam.bulk_nurbs;
533 else
534 nurbs = 1;
535 }
536
537 gspca_dev->nurbs = nurbs;
538 for (n = 0; n < nurbs; n++) {
539 urb = usb_alloc_urb(npkt, GFP_KERNEL);
540 if (!urb) {
541 err("usb_alloc_urb failed");
542 destroy_urbs(gspca_dev);
543 return -ENOMEM;
544 }
545 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
546 bsize,
547 GFP_KERNEL,
548 &urb->transfer_dma);
549
550 if (urb->transfer_buffer == NULL) {
551 usb_free_urb(urb);
552 err("usb_buffer_urb failed");
553 destroy_urbs(gspca_dev);
554 return -ENOMEM;
555 }
556 gspca_dev->urb[n] = urb;
557 urb->dev = gspca_dev->dev;
558 urb->context = gspca_dev;
559 urb->transfer_buffer_length = bsize;
560 if (npkt != 0) { /* ISOC */
561 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
562 ep->desc.bEndpointAddress);
563 urb->transfer_flags = URB_ISO_ASAP
564 | URB_NO_TRANSFER_DMA_MAP;
565 urb->interval = ep->desc.bInterval;
566 urb->complete = isoc_irq;
567 urb->number_of_packets = npkt;
568 for (i = 0; i < npkt; i++) {
569 urb->iso_frame_desc[i].length = psize;
570 urb->iso_frame_desc[i].offset = psize * i;
571 }
572 } else { /* bulk */
573 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
574 ep->desc.bEndpointAddress),
575 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
576 urb->complete = bulk_irq;
577 }
578 }
579 return 0;
580 }
581
582 /*
583 * start the USB transfer
584 */
585 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
586 {
587 struct usb_host_endpoint *ep;
588 int n, ret;
589
590 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
591 return -ERESTARTSYS;
592
593 if (!gspca_dev->present) {
594 ret = -ENODEV;
595 goto out;
596 }
597
598 /* set the higher alternate setting and
599 * loop until urb submit succeeds */
600 if (gspca_dev->cam.reverse_alts)
601 gspca_dev->alt = 0;
602 else
603 gspca_dev->alt = gspca_dev->nbalt;
604
605 if (gspca_dev->sd_desc->isoc_init) {
606 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
607 if (ret < 0)
608 goto out;
609 }
610 ep = get_ep(gspca_dev);
611 if (ep == NULL) {
612 ret = -EIO;
613 goto out;
614 }
615 for (;;) {
616 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
617 ret = create_urbs(gspca_dev, ep);
618 if (ret < 0)
619 goto out;
620
621 /* clear the bulk endpoint */
622 if (gspca_dev->cam.bulk)
623 usb_clear_halt(gspca_dev->dev,
624 gspca_dev->urb[0]->pipe);
625
626 /* start the cam */
627 ret = gspca_dev->sd_desc->start(gspca_dev);
628 if (ret < 0) {
629 destroy_urbs(gspca_dev);
630 goto out;
631 }
632 gspca_dev->streaming = 1;
633
634 /* some bulk transfers are started by the subdriver */
635 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
636 break;
637
638 /* submit the URBs */
639 for (n = 0; n < gspca_dev->nurbs; n++) {
640 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
641 if (ret < 0)
642 break;
643 }
644 if (ret >= 0)
645 break;
646 gspca_dev->streaming = 0;
647 destroy_urbs(gspca_dev);
648 if (ret != -ENOSPC) {
649 PDEBUG(D_ERR|D_STREAM,
650 "usb_submit_urb alt %d err %d",
651 gspca_dev->alt, ret);
652 goto out;
653 }
654
655 /* the bandwidth is not wide enough
656 * negociate or try a lower alternate setting */
657 PDEBUG(D_ERR|D_STREAM,
658 "bandwidth not wide enough - trying again");
659 msleep(20); /* wait for kill complete */
660 if (gspca_dev->sd_desc->isoc_nego) {
661 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
662 if (ret < 0)
663 goto out;
664 } else {
665 ep = get_ep(gspca_dev);
666 if (ep == NULL) {
667 ret = -EIO;
668 goto out;
669 }
670 }
671 }
672 out:
673 mutex_unlock(&gspca_dev->usb_lock);
674 return ret;
675 }
676
677 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
678 {
679 int ret;
680
681 if (gspca_dev->alt == 0)
682 return 0;
683 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
684 if (ret < 0)
685 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
686 return ret;
687 }
688
689 /* Note: both the queue and the usb locks should be held when calling this */
690 static void gspca_stream_off(struct gspca_dev *gspca_dev)
691 {
692 gspca_dev->streaming = 0;
693 if (gspca_dev->present) {
694 if (gspca_dev->sd_desc->stopN)
695 gspca_dev->sd_desc->stopN(gspca_dev);
696 destroy_urbs(gspca_dev);
697 gspca_set_alt0(gspca_dev);
698 }
699
700 /* always call stop0 to free the subdriver's resources */
701 if (gspca_dev->sd_desc->stop0)
702 gspca_dev->sd_desc->stop0(gspca_dev);
703 PDEBUG(D_STREAM, "stream off OK");
704 }
705
706 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
707 {
708 int i;
709
710 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
711 gspca_dev->curr_mode = i;
712 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
713 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
714 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
715 }
716
717 static int wxh_to_mode(struct gspca_dev *gspca_dev,
718 int width, int height)
719 {
720 int i;
721
722 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
723 if (width >= gspca_dev->cam.cam_mode[i].width
724 && height >= gspca_dev->cam.cam_mode[i].height)
725 break;
726 }
727 return i;
728 }
729
730 /*
731 * search a mode with the right pixel format
732 */
733 static int gspca_get_mode(struct gspca_dev *gspca_dev,
734 int mode,
735 int pixfmt)
736 {
737 int modeU, modeD;
738
739 modeU = modeD = mode;
740 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
741 if (--modeD >= 0) {
742 if (gspca_dev->cam.cam_mode[modeD].pixelformat
743 == pixfmt)
744 return modeD;
745 }
746 if (++modeU < gspca_dev->cam.nmodes) {
747 if (gspca_dev->cam.cam_mode[modeU].pixelformat
748 == pixfmt)
749 return modeU;
750 }
751 }
752 return -EINVAL;
753 }
754
755 #ifdef CONFIG_VIDEO_ADV_DEBUG
756 static int vidioc_g_register(struct file *file, void *priv,
757 struct v4l2_dbg_register *reg)
758 {
759 int ret;
760 struct gspca_dev *gspca_dev = priv;
761
762 if (!gspca_dev->sd_desc->get_chip_ident)
763 return -EINVAL;
764
765 if (!gspca_dev->sd_desc->get_register)
766 return -EINVAL;
767
768 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
769 return -ERESTARTSYS;
770 gspca_dev->usb_err = 0;
771 if (gspca_dev->present)
772 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
773 else
774 ret = -ENODEV;
775 mutex_unlock(&gspca_dev->usb_lock);
776
777 return ret;
778 }
779
780 static int vidioc_s_register(struct file *file, void *priv,
781 struct v4l2_dbg_register *reg)
782 {
783 int ret;
784 struct gspca_dev *gspca_dev = priv;
785
786 if (!gspca_dev->sd_desc->get_chip_ident)
787 return -EINVAL;
788
789 if (!gspca_dev->sd_desc->set_register)
790 return -EINVAL;
791
792 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
793 return -ERESTARTSYS;
794 gspca_dev->usb_err = 0;
795 if (gspca_dev->present)
796 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
797 else
798 ret = -ENODEV;
799 mutex_unlock(&gspca_dev->usb_lock);
800
801 return ret;
802 }
803 #endif
804
805 static int vidioc_g_chip_ident(struct file *file, void *priv,
806 struct v4l2_dbg_chip_ident *chip)
807 {
808 int ret;
809 struct gspca_dev *gspca_dev = priv;
810
811 if (!gspca_dev->sd_desc->get_chip_ident)
812 return -EINVAL;
813
814 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
815 return -ERESTARTSYS;
816 gspca_dev->usb_err = 0;
817 if (gspca_dev->present)
818 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
819 else
820 ret = -ENODEV;
821 mutex_unlock(&gspca_dev->usb_lock);
822
823 return ret;
824 }
825
826 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
827 struct v4l2_fmtdesc *fmtdesc)
828 {
829 struct gspca_dev *gspca_dev = priv;
830 int i, j, index;
831 __u32 fmt_tb[8];
832
833 /* give an index to each format */
834 index = 0;
835 j = 0;
836 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
837 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
838 j = 0;
839 for (;;) {
840 if (fmt_tb[j] == fmt_tb[index])
841 break;
842 j++;
843 }
844 if (j == index) {
845 if (fmtdesc->index == index)
846 break; /* new format */
847 index++;
848 if (index >= ARRAY_SIZE(fmt_tb))
849 return -EINVAL;
850 }
851 }
852 if (i < 0)
853 return -EINVAL; /* no more format */
854
855 fmtdesc->pixelformat = fmt_tb[index];
856 if (gspca_is_compressed(fmt_tb[index]))
857 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
858 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
859 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
860 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
861 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
862 fmtdesc->description[4] = '\0';
863 return 0;
864 }
865
866 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
867 struct v4l2_format *fmt)
868 {
869 struct gspca_dev *gspca_dev = priv;
870 int mode;
871
872 mode = gspca_dev->curr_mode;
873 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
874 sizeof fmt->fmt.pix);
875 return 0;
876 }
877
878 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
879 struct v4l2_format *fmt)
880 {
881 int w, h, mode, mode2;
882
883 w = fmt->fmt.pix.width;
884 h = fmt->fmt.pix.height;
885
886 #ifdef GSPCA_DEBUG
887 if (gspca_debug & D_CONF)
888 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
889 #endif
890 /* search the closest mode for width and height */
891 mode = wxh_to_mode(gspca_dev, w, h);
892
893 /* OK if right palette */
894 if (gspca_dev->cam.cam_mode[mode].pixelformat
895 != fmt->fmt.pix.pixelformat) {
896
897 /* else, search the closest mode with the same pixel format */
898 mode2 = gspca_get_mode(gspca_dev, mode,
899 fmt->fmt.pix.pixelformat);
900 if (mode2 >= 0)
901 mode = mode2;
902 /* else
903 ; * no chance, return this mode */
904 }
905 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
906 sizeof fmt->fmt.pix);
907 return mode; /* used when s_fmt */
908 }
909
910 static int vidioc_try_fmt_vid_cap(struct file *file,
911 void *priv,
912 struct v4l2_format *fmt)
913 {
914 struct gspca_dev *gspca_dev = priv;
915 int ret;
916
917 ret = try_fmt_vid_cap(gspca_dev, fmt);
918 if (ret < 0)
919 return ret;
920 return 0;
921 }
922
923 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
924 struct v4l2_format *fmt)
925 {
926 struct gspca_dev *gspca_dev = priv;
927 int ret;
928
929 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
930 return -ERESTARTSYS;
931
932 ret = try_fmt_vid_cap(gspca_dev, fmt);
933 if (ret < 0)
934 goto out;
935
936 if (gspca_dev->nframes != 0
937 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
938 ret = -EINVAL;
939 goto out;
940 }
941
942 if (ret == gspca_dev->curr_mode) {
943 ret = 0;
944 goto out; /* same mode */
945 }
946
947 if (gspca_dev->streaming) {
948 ret = -EBUSY;
949 goto out;
950 }
951 gspca_dev->width = fmt->fmt.pix.width;
952 gspca_dev->height = fmt->fmt.pix.height;
953 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
954 gspca_dev->curr_mode = ret;
955
956 ret = 0;
957 out:
958 mutex_unlock(&gspca_dev->queue_lock);
959 return ret;
960 }
961
962 static int vidioc_enum_framesizes(struct file *file, void *priv,
963 struct v4l2_frmsizeenum *fsize)
964 {
965 struct gspca_dev *gspca_dev = priv;
966 int i;
967 __u32 index = 0;
968
969 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
970 if (fsize->pixel_format !=
971 gspca_dev->cam.cam_mode[i].pixelformat)
972 continue;
973
974 if (fsize->index == index) {
975 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
976 fsize->discrete.width =
977 gspca_dev->cam.cam_mode[i].width;
978 fsize->discrete.height =
979 gspca_dev->cam.cam_mode[i].height;
980 return 0;
981 }
982 index++;
983 }
984
985 return -EINVAL;
986 }
987
988 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
989 struct v4l2_frmivalenum *fival)
990 {
991 struct gspca_dev *gspca_dev = priv;
992 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
993 __u32 i;
994
995 if (gspca_dev->cam.mode_framerates == NULL ||
996 gspca_dev->cam.mode_framerates[mode].nrates == 0)
997 return -EINVAL;
998
999 if (fival->pixel_format !=
1000 gspca_dev->cam.cam_mode[mode].pixelformat)
1001 return -EINVAL;
1002
1003 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1004 if (fival->index == i) {
1005 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1006 fival->discrete.numerator = 1;
1007 fival->discrete.denominator =
1008 gspca_dev->cam.mode_framerates[mode].rates[i];
1009 return 0;
1010 }
1011 }
1012
1013 return -EINVAL;
1014 }
1015
1016 static void gspca_release(struct video_device *vfd)
1017 {
1018 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1019
1020 PDEBUG(D_PROBE, "%s released",
1021 video_device_node_name(&gspca_dev->vdev));
1022
1023 kfree(gspca_dev->usb_buf);
1024 kfree(gspca_dev);
1025 }
1026
1027 static int dev_open(struct file *file)
1028 {
1029 struct gspca_dev *gspca_dev;
1030 int ret;
1031
1032 PDEBUG(D_STREAM, "[%s] open", current->comm);
1033 gspca_dev = (struct gspca_dev *) video_devdata(file);
1034 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1035 return -ERESTARTSYS;
1036 if (!gspca_dev->present) {
1037 ret = -ENODEV;
1038 goto out;
1039 }
1040
1041 if (gspca_dev->users > 4) { /* (arbitrary value) */
1042 ret = -EBUSY;
1043 goto out;
1044 }
1045
1046 /* protect the subdriver against rmmod */
1047 if (!try_module_get(gspca_dev->module)) {
1048 ret = -ENODEV;
1049 goto out;
1050 }
1051
1052 gspca_dev->users++;
1053
1054 file->private_data = gspca_dev;
1055 #ifdef GSPCA_DEBUG
1056 /* activate the v4l2 debug */
1057 if (gspca_debug & D_V4L2)
1058 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1059 | V4L2_DEBUG_IOCTL_ARG;
1060 else
1061 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1062 | V4L2_DEBUG_IOCTL_ARG);
1063 #endif
1064 ret = 0;
1065 out:
1066 mutex_unlock(&gspca_dev->queue_lock);
1067 if (ret != 0)
1068 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1069 else
1070 PDEBUG(D_STREAM, "open done");
1071 return ret;
1072 }
1073
1074 static int dev_close(struct file *file)
1075 {
1076 struct gspca_dev *gspca_dev = file->private_data;
1077
1078 PDEBUG(D_STREAM, "[%s] close", current->comm);
1079 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1080 return -ERESTARTSYS;
1081 gspca_dev->users--;
1082
1083 /* if the file did the capture, free the streaming resources */
1084 if (gspca_dev->capt_file == file) {
1085 if (gspca_dev->streaming) {
1086 mutex_lock(&gspca_dev->usb_lock);
1087 gspca_dev->usb_err = 0;
1088 gspca_stream_off(gspca_dev);
1089 mutex_unlock(&gspca_dev->usb_lock);
1090 }
1091 frame_free(gspca_dev);
1092 gspca_dev->capt_file = NULL;
1093 gspca_dev->memory = GSPCA_MEMORY_NO;
1094 }
1095 file->private_data = NULL;
1096 module_put(gspca_dev->module);
1097 mutex_unlock(&gspca_dev->queue_lock);
1098
1099 PDEBUG(D_STREAM, "close done");
1100
1101 return 0;
1102 }
1103
1104 static int vidioc_querycap(struct file *file, void *priv,
1105 struct v4l2_capability *cap)
1106 {
1107 struct gspca_dev *gspca_dev = priv;
1108 int ret;
1109
1110 /* protect the access to the usb device */
1111 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1112 return -ERESTARTSYS;
1113 if (!gspca_dev->present) {
1114 ret = -ENODEV;
1115 goto out;
1116 }
1117 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1118 if (gspca_dev->dev->product != NULL) {
1119 strncpy(cap->card, gspca_dev->dev->product,
1120 sizeof cap->card);
1121 } else {
1122 snprintf(cap->card, sizeof cap->card,
1123 "USB Camera (%04x:%04x)",
1124 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1125 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1126 }
1127 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1128 cap->version = DRIVER_VERSION_NUMBER;
1129 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1130 | V4L2_CAP_STREAMING
1131 | V4L2_CAP_READWRITE;
1132 ret = 0;
1133 out:
1134 mutex_unlock(&gspca_dev->usb_lock);
1135 return ret;
1136 }
1137
1138 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1139 int id)
1140 {
1141 const struct ctrl *ctrls;
1142 int i;
1143
1144 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1145 i < gspca_dev->sd_desc->nctrls;
1146 i++, ctrls++) {
1147 if (gspca_dev->ctrl_dis & (1 << i))
1148 continue;
1149 if (id == ctrls->qctrl.id)
1150 return ctrls;
1151 }
1152 return NULL;
1153 }
1154
1155 static int vidioc_queryctrl(struct file *file, void *priv,
1156 struct v4l2_queryctrl *q_ctrl)
1157 {
1158 struct gspca_dev *gspca_dev = priv;
1159 const struct ctrl *ctrls;
1160 int i;
1161 u32 id;
1162
1163 ctrls = NULL;
1164 id = q_ctrl->id;
1165 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1166 id &= V4L2_CTRL_ID_MASK;
1167 id++;
1168 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1169 if (gspca_dev->ctrl_dis & (1 << i))
1170 continue;
1171 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1172 continue;
1173 if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1174 > ctrls->qctrl.id)
1175 continue;
1176 ctrls = &gspca_dev->sd_desc->ctrls[i];
1177 }
1178 if (ctrls == NULL)
1179 return -EINVAL;
1180 } else {
1181 ctrls = get_ctrl(gspca_dev, id);
1182 if (ctrls == NULL)
1183 return -EINVAL;
1184 i = ctrls - gspca_dev->sd_desc->ctrls;
1185 }
1186 memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1187 if (gspca_dev->ctrl_inac & (1 << i))
1188 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1189 return 0;
1190 }
1191
1192 static int vidioc_s_ctrl(struct file *file, void *priv,
1193 struct v4l2_control *ctrl)
1194 {
1195 struct gspca_dev *gspca_dev = priv;
1196 const struct ctrl *ctrls;
1197 int ret;
1198
1199 ctrls = get_ctrl(gspca_dev, ctrl->id);
1200 if (ctrls == NULL)
1201 return -EINVAL;
1202
1203 if (ctrl->value < ctrls->qctrl.minimum
1204 || ctrl->value > ctrls->qctrl.maximum)
1205 return -ERANGE;
1206 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1207 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1208 return -ERESTARTSYS;
1209 gspca_dev->usb_err = 0;
1210 if (gspca_dev->present)
1211 ret = ctrls->set(gspca_dev, ctrl->value);
1212 else
1213 ret = -ENODEV;
1214 mutex_unlock(&gspca_dev->usb_lock);
1215 return ret;
1216 }
1217
1218 static int vidioc_g_ctrl(struct file *file, void *priv,
1219 struct v4l2_control *ctrl)
1220 {
1221 struct gspca_dev *gspca_dev = priv;
1222 const struct ctrl *ctrls;
1223 int ret;
1224
1225 ctrls = get_ctrl(gspca_dev, ctrl->id);
1226 if (ctrls == NULL)
1227 return -EINVAL;
1228
1229 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1230 return -ERESTARTSYS;
1231 gspca_dev->usb_err = 0;
1232 if (gspca_dev->present)
1233 ret = ctrls->get(gspca_dev, &ctrl->value);
1234 else
1235 ret = -ENODEV;
1236 mutex_unlock(&gspca_dev->usb_lock);
1237 return ret;
1238 }
1239
1240 /*fixme: have an audio flag in gspca_dev?*/
1241 static int vidioc_s_audio(struct file *file, void *priv,
1242 struct v4l2_audio *audio)
1243 {
1244 if (audio->index != 0)
1245 return -EINVAL;
1246 return 0;
1247 }
1248
1249 static int vidioc_g_audio(struct file *file, void *priv,
1250 struct v4l2_audio *audio)
1251 {
1252 strcpy(audio->name, "Microphone");
1253 return 0;
1254 }
1255
1256 static int vidioc_enumaudio(struct file *file, void *priv,
1257 struct v4l2_audio *audio)
1258 {
1259 if (audio->index != 0)
1260 return -EINVAL;
1261
1262 strcpy(audio->name, "Microphone");
1263 audio->capability = 0;
1264 audio->mode = 0;
1265 return 0;
1266 }
1267
1268 static int vidioc_querymenu(struct file *file, void *priv,
1269 struct v4l2_querymenu *qmenu)
1270 {
1271 struct gspca_dev *gspca_dev = priv;
1272
1273 if (!gspca_dev->sd_desc->querymenu)
1274 return -EINVAL;
1275 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1276 }
1277
1278 static int vidioc_enum_input(struct file *file, void *priv,
1279 struct v4l2_input *input)
1280 {
1281 struct gspca_dev *gspca_dev = priv;
1282
1283 if (input->index != 0)
1284 return -EINVAL;
1285 input->type = V4L2_INPUT_TYPE_CAMERA;
1286 input->status = gspca_dev->cam.input_flags;
1287 strncpy(input->name, gspca_dev->sd_desc->name,
1288 sizeof input->name);
1289 return 0;
1290 }
1291
1292 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1293 {
1294 *i = 0;
1295 return 0;
1296 }
1297
1298 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1299 {
1300 if (i > 0)
1301 return -EINVAL;
1302 return (0);
1303 }
1304
1305 static int vidioc_reqbufs(struct file *file, void *priv,
1306 struct v4l2_requestbuffers *rb)
1307 {
1308 struct gspca_dev *gspca_dev = priv;
1309 int i, ret = 0;
1310
1311 switch (rb->memory) {
1312 case GSPCA_MEMORY_READ: /* (internal call) */
1313 case V4L2_MEMORY_MMAP:
1314 case V4L2_MEMORY_USERPTR:
1315 break;
1316 default:
1317 return -EINVAL;
1318 }
1319 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1320 return -ERESTARTSYS;
1321
1322 if (gspca_dev->memory != GSPCA_MEMORY_NO
1323 && gspca_dev->memory != rb->memory) {
1324 ret = -EBUSY;
1325 goto out;
1326 }
1327
1328 /* only one file may do the capture */
1329 if (gspca_dev->capt_file != NULL
1330 && gspca_dev->capt_file != file) {
1331 ret = -EBUSY;
1332 goto out;
1333 }
1334
1335 /* if allocated, the buffers must not be mapped */
1336 for (i = 0; i < gspca_dev->nframes; i++) {
1337 if (gspca_dev->frame[i].vma_use_count) {
1338 ret = -EBUSY;
1339 goto out;
1340 }
1341 }
1342
1343 /* stop streaming */
1344 if (gspca_dev->streaming) {
1345 mutex_lock(&gspca_dev->usb_lock);
1346 gspca_dev->usb_err = 0;
1347 gspca_stream_off(gspca_dev);
1348 mutex_unlock(&gspca_dev->usb_lock);
1349 }
1350
1351 /* free the previous allocated buffers, if any */
1352 if (gspca_dev->nframes != 0) {
1353 frame_free(gspca_dev);
1354 gspca_dev->capt_file = NULL;
1355 }
1356 if (rb->count == 0) /* unrequest */
1357 goto out;
1358 gspca_dev->memory = rb->memory;
1359 ret = frame_alloc(gspca_dev, rb->count);
1360 if (ret == 0) {
1361 rb->count = gspca_dev->nframes;
1362 gspca_dev->capt_file = file;
1363 }
1364 out:
1365 mutex_unlock(&gspca_dev->queue_lock);
1366 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1367 return ret;
1368 }
1369
1370 static int vidioc_querybuf(struct file *file, void *priv,
1371 struct v4l2_buffer *v4l2_buf)
1372 {
1373 struct gspca_dev *gspca_dev = priv;
1374 struct gspca_frame *frame;
1375
1376 if (v4l2_buf->index < 0
1377 || v4l2_buf->index >= gspca_dev->nframes)
1378 return -EINVAL;
1379
1380 frame = &gspca_dev->frame[v4l2_buf->index];
1381 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1382 return 0;
1383 }
1384
1385 static int vidioc_streamon(struct file *file, void *priv,
1386 enum v4l2_buf_type buf_type)
1387 {
1388 struct gspca_dev *gspca_dev = priv;
1389 int ret;
1390
1391 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1392 return -EINVAL;
1393 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1394 return -ERESTARTSYS;
1395
1396 if (gspca_dev->nframes == 0
1397 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1398 ret = -EINVAL;
1399 goto out;
1400 }
1401 if (!gspca_dev->streaming) {
1402 ret = gspca_init_transfer(gspca_dev);
1403 if (ret < 0)
1404 goto out;
1405 }
1406 #ifdef GSPCA_DEBUG
1407 if (gspca_debug & D_STREAM) {
1408 PDEBUG_MODE("stream on OK",
1409 gspca_dev->pixfmt,
1410 gspca_dev->width,
1411 gspca_dev->height);
1412 }
1413 #endif
1414 ret = 0;
1415 out:
1416 mutex_unlock(&gspca_dev->queue_lock);
1417 return ret;
1418 }
1419
1420 static int vidioc_streamoff(struct file *file, void *priv,
1421 enum v4l2_buf_type buf_type)
1422 {
1423 struct gspca_dev *gspca_dev = priv;
1424 int i, ret;
1425
1426 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1427 return -EINVAL;
1428 if (!gspca_dev->streaming)
1429 return 0;
1430 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1431 return -ERESTARTSYS;
1432
1433 /* stop streaming */
1434 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1435 ret = -ERESTARTSYS;
1436 goto out;
1437 }
1438 gspca_dev->usb_err = 0;
1439 gspca_stream_off(gspca_dev);
1440 mutex_unlock(&gspca_dev->usb_lock);
1441
1442 /* empty the application queues */
1443 for (i = 0; i < gspca_dev->nframes; i++)
1444 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1445 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1446 gspca_dev->last_packet_type = DISCARD_PACKET;
1447 gspca_dev->sequence = 0;
1448 ret = 0;
1449 out:
1450 mutex_unlock(&gspca_dev->queue_lock);
1451 return ret;
1452 }
1453
1454 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1455 struct v4l2_jpegcompression *jpegcomp)
1456 {
1457 struct gspca_dev *gspca_dev = priv;
1458 int ret;
1459
1460 if (!gspca_dev->sd_desc->get_jcomp)
1461 return -EINVAL;
1462 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1463 return -ERESTARTSYS;
1464 gspca_dev->usb_err = 0;
1465 if (gspca_dev->present)
1466 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1467 else
1468 ret = -ENODEV;
1469 mutex_unlock(&gspca_dev->usb_lock);
1470 return ret;
1471 }
1472
1473 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1474 struct v4l2_jpegcompression *jpegcomp)
1475 {
1476 struct gspca_dev *gspca_dev = priv;
1477 int ret;
1478
1479 if (!gspca_dev->sd_desc->set_jcomp)
1480 return -EINVAL;
1481 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1482 return -ERESTARTSYS;
1483 gspca_dev->usb_err = 0;
1484 if (gspca_dev->present)
1485 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1486 else
1487 ret = -ENODEV;
1488 mutex_unlock(&gspca_dev->usb_lock);
1489 return ret;
1490 }
1491
1492 static int vidioc_g_parm(struct file *filp, void *priv,
1493 struct v4l2_streamparm *parm)
1494 {
1495 struct gspca_dev *gspca_dev = priv;
1496
1497 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1498
1499 if (gspca_dev->sd_desc->get_streamparm) {
1500 int ret;
1501
1502 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1503 return -ERESTARTSYS;
1504 gspca_dev->usb_err = 0;
1505 if (gspca_dev->present)
1506 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1507 parm);
1508 else
1509 ret = -ENODEV;
1510 mutex_unlock(&gspca_dev->usb_lock);
1511 return ret;
1512 }
1513
1514 return 0;
1515 }
1516
1517 static int vidioc_s_parm(struct file *filp, void *priv,
1518 struct v4l2_streamparm *parm)
1519 {
1520 struct gspca_dev *gspca_dev = priv;
1521 int n;
1522
1523 n = parm->parm.capture.readbuffers;
1524 if (n == 0 || n > GSPCA_MAX_FRAMES)
1525 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1526 else
1527 gspca_dev->nbufread = n;
1528
1529 if (gspca_dev->sd_desc->set_streamparm) {
1530 int ret;
1531
1532 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1533 return -ERESTARTSYS;
1534 gspca_dev->usb_err = 0;
1535 if (gspca_dev->present)
1536 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1537 parm);
1538 else
1539 ret = -ENODEV;
1540 mutex_unlock(&gspca_dev->usb_lock);
1541 return ret;
1542 }
1543
1544 return 0;
1545 }
1546
1547 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1548 static int vidiocgmbuf(struct file *file, void *priv,
1549 struct video_mbuf *mbuf)
1550 {
1551 struct gspca_dev *gspca_dev = file->private_data;
1552 int i;
1553
1554 PDEBUG(D_STREAM, "cgmbuf");
1555 if (gspca_dev->nframes == 0) {
1556 int ret;
1557
1558 {
1559 struct v4l2_format fmt;
1560
1561 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1562 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1563 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1564 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1565 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1566 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1567 if (ret != 0)
1568 return ret;
1569 }
1570 {
1571 struct v4l2_requestbuffers rb;
1572
1573 memset(&rb, 0, sizeof rb);
1574 rb.count = 4;
1575 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1576 rb.memory = V4L2_MEMORY_MMAP;
1577 ret = vidioc_reqbufs(file, priv, &rb);
1578 if (ret != 0)
1579 return ret;
1580 }
1581 }
1582 mbuf->frames = gspca_dev->nframes;
1583 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1584 for (i = 0; i < mbuf->frames; i++)
1585 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1586 return 0;
1587 }
1588 #endif
1589
1590 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1591 {
1592 struct gspca_dev *gspca_dev = file->private_data;
1593 struct gspca_frame *frame;
1594 struct page *page;
1595 unsigned long addr, start, size;
1596 int i, ret;
1597
1598 start = vma->vm_start;
1599 size = vma->vm_end - vma->vm_start;
1600 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1601
1602 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1603 return -ERESTARTSYS;
1604 if (!gspca_dev->present) {
1605 ret = -ENODEV;
1606 goto out;
1607 }
1608 if (gspca_dev->capt_file != file) {
1609 ret = -EINVAL;
1610 goto out;
1611 }
1612
1613 frame = NULL;
1614 for (i = 0; i < gspca_dev->nframes; ++i) {
1615 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1616 PDEBUG(D_STREAM, "mmap bad memory type");
1617 break;
1618 }
1619 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1620 == vma->vm_pgoff) {
1621 frame = &gspca_dev->frame[i];
1622 break;
1623 }
1624 }
1625 if (frame == NULL) {
1626 PDEBUG(D_STREAM, "mmap no frame buffer found");
1627 ret = -EINVAL;
1628 goto out;
1629 }
1630 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1631 /* v4l1 maps all the buffers */
1632 if (i != 0
1633 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1634 #endif
1635 if (size != frame->v4l2_buf.length) {
1636 PDEBUG(D_STREAM, "mmap bad size");
1637 ret = -EINVAL;
1638 goto out;
1639 }
1640
1641 /*
1642 * - VM_IO marks the area as being a mmaped region for I/O to a
1643 * device. It also prevents the region from being core dumped.
1644 */
1645 vma->vm_flags |= VM_IO;
1646
1647 addr = (unsigned long) frame->data;
1648 while (size > 0) {
1649 page = vmalloc_to_page((void *) addr);
1650 ret = vm_insert_page(vma, start, page);
1651 if (ret < 0)
1652 goto out;
1653 start += PAGE_SIZE;
1654 addr += PAGE_SIZE;
1655 size -= PAGE_SIZE;
1656 }
1657
1658 vma->vm_ops = &gspca_vm_ops;
1659 vma->vm_private_data = frame;
1660 gspca_vm_open(vma);
1661 ret = 0;
1662 out:
1663 mutex_unlock(&gspca_dev->queue_lock);
1664 return ret;
1665 }
1666
1667 /*
1668 * wait for a video frame
1669 *
1670 * If a frame is ready, its index is returned.
1671 */
1672 static int frame_wait(struct gspca_dev *gspca_dev,
1673 int nonblock_ing)
1674 {
1675 struct gspca_frame *frame;
1676 int i, j, ret;
1677
1678 /* check if a frame is ready */
1679 i = gspca_dev->fr_o;
1680 j = gspca_dev->fr_queue[i];
1681 frame = &gspca_dev->frame[j];
1682
1683 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1684 if (nonblock_ing)
1685 return -EAGAIN;
1686
1687 /* wait till a frame is ready */
1688 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1689 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1690 !gspca_dev->streaming || !gspca_dev->present,
1691 msecs_to_jiffies(3000));
1692 if (ret < 0)
1693 return ret;
1694 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1695 return -EIO;
1696 }
1697
1698 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1699 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1700 gspca_dev->fr_q,
1701 gspca_dev->fr_i,
1702 gspca_dev->fr_o);
1703
1704 if (gspca_dev->sd_desc->dq_callback) {
1705 mutex_lock(&gspca_dev->usb_lock);
1706 gspca_dev->usb_err = 0;
1707 if (gspca_dev->present)
1708 gspca_dev->sd_desc->dq_callback(gspca_dev);
1709 mutex_unlock(&gspca_dev->usb_lock);
1710 }
1711 return j;
1712 }
1713
1714 /*
1715 * dequeue a video buffer
1716 *
1717 * If nonblock_ing is false, block until a buffer is available.
1718 */
1719 static int vidioc_dqbuf(struct file *file, void *priv,
1720 struct v4l2_buffer *v4l2_buf)
1721 {
1722 struct gspca_dev *gspca_dev = priv;
1723 struct gspca_frame *frame;
1724 int i, ret;
1725
1726 PDEBUG(D_FRAM, "dqbuf");
1727 if (v4l2_buf->memory != gspca_dev->memory)
1728 return -EINVAL;
1729
1730 if (!gspca_dev->present)
1731 return -ENODEV;
1732
1733 /* if not streaming, be sure the application will not loop forever */
1734 if (!(file->f_flags & O_NONBLOCK)
1735 && !gspca_dev->streaming && gspca_dev->users == 1)
1736 return -EINVAL;
1737
1738 /* only the capturing file may dequeue */
1739 if (gspca_dev->capt_file != file)
1740 return -EINVAL;
1741
1742 /* only one dequeue / read at a time */
1743 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1744 return -ERESTARTSYS;
1745
1746 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1747 if (ret < 0)
1748 goto out;
1749 i = ret; /* frame index */
1750 frame = &gspca_dev->frame[i];
1751 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1752 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1753 frame->data,
1754 frame->v4l2_buf.bytesused)) {
1755 PDEBUG(D_ERR|D_STREAM,
1756 "dqbuf cp to user failed");
1757 ret = -EFAULT;
1758 goto out;
1759 }
1760 }
1761 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1762 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1763 PDEBUG(D_FRAM, "dqbuf %d", i);
1764 ret = 0;
1765 out:
1766 mutex_unlock(&gspca_dev->read_lock);
1767 return ret;
1768 }
1769
1770 /*
1771 * queue a video buffer
1772 *
1773 * Attempting to queue a buffer that has already been
1774 * queued will return -EINVAL.
1775 */
1776 static int vidioc_qbuf(struct file *file, void *priv,
1777 struct v4l2_buffer *v4l2_buf)
1778 {
1779 struct gspca_dev *gspca_dev = priv;
1780 struct gspca_frame *frame;
1781 int i, index, ret;
1782
1783 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1784
1785 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1786 return -ERESTARTSYS;
1787
1788 index = v4l2_buf->index;
1789 if ((unsigned) index >= gspca_dev->nframes) {
1790 PDEBUG(D_FRAM,
1791 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1792 ret = -EINVAL;
1793 goto out;
1794 }
1795 if (v4l2_buf->memory != gspca_dev->memory) {
1796 PDEBUG(D_FRAM, "qbuf bad memory type");
1797 ret = -EINVAL;
1798 goto out;
1799 }
1800
1801 frame = &gspca_dev->frame[index];
1802 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1803 PDEBUG(D_FRAM, "qbuf bad state");
1804 ret = -EINVAL;
1805 goto out;
1806 }
1807
1808 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1809
1810 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1811 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1812 frame->v4l2_buf.length = v4l2_buf->length;
1813 }
1814
1815 /* put the buffer in the 'queued' queue */
1816 i = gspca_dev->fr_q;
1817 gspca_dev->fr_queue[i] = index;
1818 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1819 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1820 gspca_dev->fr_q,
1821 gspca_dev->fr_i,
1822 gspca_dev->fr_o);
1823
1824 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1825 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1826 ret = 0;
1827 out:
1828 mutex_unlock(&gspca_dev->queue_lock);
1829 return ret;
1830 }
1831
1832 /*
1833 * allocate the resources for read()
1834 */
1835 static int read_alloc(struct gspca_dev *gspca_dev,
1836 struct file *file)
1837 {
1838 struct v4l2_buffer v4l2_buf;
1839 int i, ret;
1840
1841 PDEBUG(D_STREAM, "read alloc");
1842 if (gspca_dev->nframes == 0) {
1843 struct v4l2_requestbuffers rb;
1844
1845 memset(&rb, 0, sizeof rb);
1846 rb.count = gspca_dev->nbufread;
1847 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1848 rb.memory = GSPCA_MEMORY_READ;
1849 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1850 if (ret != 0) {
1851 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1852 return ret;
1853 }
1854 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1855 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1856 v4l2_buf.memory = GSPCA_MEMORY_READ;
1857 for (i = 0; i < gspca_dev->nbufread; i++) {
1858 v4l2_buf.index = i;
1859 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1860 if (ret != 0) {
1861 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1862 return ret;
1863 }
1864 }
1865 gspca_dev->memory = GSPCA_MEMORY_READ;
1866 }
1867
1868 /* start streaming */
1869 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1870 if (ret != 0)
1871 PDEBUG(D_STREAM, "read streamon err %d", ret);
1872 return ret;
1873 }
1874
1875 static unsigned int dev_poll(struct file *file, poll_table *wait)
1876 {
1877 struct gspca_dev *gspca_dev = file->private_data;
1878 int i, ret;
1879
1880 PDEBUG(D_FRAM, "poll");
1881
1882 poll_wait(file, &gspca_dev->wq, wait);
1883
1884 /* if reqbufs is not done, the user would use read() */
1885 if (gspca_dev->nframes == 0) {
1886 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1887 return POLLERR; /* not the 1st time */
1888 ret = read_alloc(gspca_dev, file);
1889 if (ret != 0)
1890 return POLLERR;
1891 }
1892
1893 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1894 return POLLERR;
1895
1896 /* check the next incoming buffer */
1897 i = gspca_dev->fr_o;
1898 i = gspca_dev->fr_queue[i];
1899 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1900 ret = POLLIN | POLLRDNORM; /* something to read */
1901 else
1902 ret = 0;
1903 mutex_unlock(&gspca_dev->queue_lock);
1904 if (!gspca_dev->present)
1905 return POLLHUP;
1906 return ret;
1907 }
1908
1909 static ssize_t dev_read(struct file *file, char __user *data,
1910 size_t count, loff_t *ppos)
1911 {
1912 struct gspca_dev *gspca_dev = file->private_data;
1913 struct gspca_frame *frame;
1914 struct v4l2_buffer v4l2_buf;
1915 struct timeval timestamp;
1916 int n, ret, ret2;
1917
1918 PDEBUG(D_FRAM, "read (%zd)", count);
1919 if (!gspca_dev->present)
1920 return -ENODEV;
1921 switch (gspca_dev->memory) {
1922 case GSPCA_MEMORY_NO: /* first time */
1923 ret = read_alloc(gspca_dev, file);
1924 if (ret != 0)
1925 return ret;
1926 break;
1927 case GSPCA_MEMORY_READ:
1928 if (gspca_dev->capt_file == file)
1929 break;
1930 /* fall thru */
1931 default:
1932 return -EINVAL;
1933 }
1934
1935 /* get a frame */
1936 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1937 timestamp.tv_sec--;
1938 n = 2;
1939 for (;;) {
1940 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1941 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1942 v4l2_buf.memory = GSPCA_MEMORY_READ;
1943 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1944 if (ret != 0) {
1945 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1946 return ret;
1947 }
1948
1949 /* if the process slept for more than 1 second,
1950 * get a newer frame */
1951 frame = &gspca_dev->frame[v4l2_buf.index];
1952 if (--n < 0)
1953 break; /* avoid infinite loop */
1954 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1955 break;
1956 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1957 if (ret != 0) {
1958 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1959 return ret;
1960 }
1961 }
1962
1963 /* copy the frame */
1964 if (count > frame->v4l2_buf.bytesused)
1965 count = frame->v4l2_buf.bytesused;
1966 ret = copy_to_user(data, frame->data, count);
1967 if (ret != 0) {
1968 PDEBUG(D_ERR|D_STREAM,
1969 "read cp to user lack %d / %zd", ret, count);
1970 ret = -EFAULT;
1971 goto out;
1972 }
1973 ret = count;
1974 out:
1975 /* in each case, requeue the buffer */
1976 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1977 if (ret2 != 0)
1978 return ret2;
1979 return ret;
1980 }
1981
1982 static struct v4l2_file_operations dev_fops = {
1983 .owner = THIS_MODULE,
1984 .open = dev_open,
1985 .release = dev_close,
1986 .read = dev_read,
1987 .mmap = dev_mmap,
1988 .unlocked_ioctl = video_ioctl2,
1989 .poll = dev_poll,
1990 };
1991
1992 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1993 .vidioc_querycap = vidioc_querycap,
1994 .vidioc_dqbuf = vidioc_dqbuf,
1995 .vidioc_qbuf = vidioc_qbuf,
1996 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1997 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1998 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1999 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2000 .vidioc_streamon = vidioc_streamon,
2001 .vidioc_queryctrl = vidioc_queryctrl,
2002 .vidioc_g_ctrl = vidioc_g_ctrl,
2003 .vidioc_s_ctrl = vidioc_s_ctrl,
2004 .vidioc_g_audio = vidioc_g_audio,
2005 .vidioc_s_audio = vidioc_s_audio,
2006 .vidioc_enumaudio = vidioc_enumaudio,
2007 .vidioc_querymenu = vidioc_querymenu,
2008 .vidioc_enum_input = vidioc_enum_input,
2009 .vidioc_g_input = vidioc_g_input,
2010 .vidioc_s_input = vidioc_s_input,
2011 .vidioc_reqbufs = vidioc_reqbufs,
2012 .vidioc_querybuf = vidioc_querybuf,
2013 .vidioc_streamoff = vidioc_streamoff,
2014 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2015 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2016 .vidioc_g_parm = vidioc_g_parm,
2017 .vidioc_s_parm = vidioc_s_parm,
2018 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2019 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2020 #ifdef CONFIG_VIDEO_ADV_DEBUG
2021 .vidioc_g_register = vidioc_g_register,
2022 .vidioc_s_register = vidioc_s_register,
2023 #endif
2024 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2025 #ifdef CONFIG_VIDEO_V4L1_COMPAT
2026 .vidiocgmbuf = vidiocgmbuf,
2027 #endif
2028 };
2029
2030 static struct video_device gspca_template = {
2031 .name = "gspca main driver",
2032 .fops = &dev_fops,
2033 .ioctl_ops = &dev_ioctl_ops,
2034 .release = gspca_release,
2035 };
2036
2037 /*
2038 * probe and create a new gspca device
2039 *
2040 * This function must be called by the sub-driver when it is
2041 * called for probing a new device.
2042 */
2043 int gspca_dev_probe(struct usb_interface *intf,
2044 const struct usb_device_id *id,
2045 const struct sd_desc *sd_desc,
2046 int dev_size,
2047 struct module *module)
2048 {
2049 struct usb_interface_descriptor *interface;
2050 struct gspca_dev *gspca_dev;
2051 struct usb_device *dev = interface_to_usbdev(intf);
2052 int ret;
2053
2054 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2055
2056 /* we don't handle multi-config cameras */
2057 if (dev->descriptor.bNumConfigurations != 1) {
2058 PDEBUG(D_ERR, "Too many config");
2059 return -ENODEV;
2060 }
2061 interface = &intf->cur_altsetting->desc;
2062 if (interface->bInterfaceNumber > 0) {
2063 PDEBUG(D_ERR, "intf != 0");
2064 return -ENODEV;
2065 }
2066
2067 /* create the device */
2068 if (dev_size < sizeof *gspca_dev)
2069 dev_size = sizeof *gspca_dev;
2070 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2071 if (!gspca_dev) {
2072 err("couldn't kzalloc gspca struct");
2073 return -ENOMEM;
2074 }
2075 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2076 if (!gspca_dev->usb_buf) {
2077 err("out of memory");
2078 ret = -ENOMEM;
2079 goto out;
2080 }
2081 gspca_dev->dev = dev;
2082 gspca_dev->iface = interface->bInterfaceNumber;
2083 gspca_dev->nbalt = intf->num_altsetting;
2084 gspca_dev->sd_desc = sd_desc;
2085 gspca_dev->nbufread = 2;
2086 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2087
2088 /* configure the subdriver and initialize the USB device */
2089 ret = sd_desc->config(gspca_dev, id);
2090 if (ret < 0)
2091 goto out;
2092 ret = sd_desc->init(gspca_dev);
2093 if (ret < 0)
2094 goto out;
2095 gspca_set_default_mode(gspca_dev);
2096
2097 mutex_init(&gspca_dev->usb_lock);
2098 mutex_init(&gspca_dev->read_lock);
2099 mutex_init(&gspca_dev->queue_lock);
2100 init_waitqueue_head(&gspca_dev->wq);
2101
2102 /* init video stuff */
2103 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2104 gspca_dev->vdev.parent = &intf->dev;
2105 gspca_dev->module = module;
2106 gspca_dev->present = 1;
2107 ret = video_register_device(&gspca_dev->vdev,
2108 VFL_TYPE_GRABBER,
2109 -1);
2110 if (ret < 0) {
2111 err("video_register_device err %d", ret);
2112 goto out;
2113 }
2114
2115 usb_set_intfdata(intf, gspca_dev);
2116 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2117 return 0;
2118 out:
2119 kfree(gspca_dev->usb_buf);
2120 kfree(gspca_dev);
2121 return ret;
2122 }
2123 EXPORT_SYMBOL(gspca_dev_probe);
2124
2125 /*
2126 * USB disconnection
2127 *
2128 * This function must be called by the sub-driver
2129 * when the device disconnects, after the specific resources are freed.
2130 */
2131 void gspca_disconnect(struct usb_interface *intf)
2132 {
2133 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2134
2135 PDEBUG(D_PROBE, "%s disconnect",
2136 video_device_node_name(&gspca_dev->vdev));
2137 mutex_lock(&gspca_dev->usb_lock);
2138 gspca_dev->present = 0;
2139
2140 if (gspca_dev->streaming) {
2141 destroy_urbs(gspca_dev);
2142 wake_up_interruptible(&gspca_dev->wq);
2143 }
2144
2145 /* the device is freed at exit of this function */
2146 gspca_dev->dev = NULL;
2147 mutex_unlock(&gspca_dev->usb_lock);
2148
2149 usb_set_intfdata(intf, NULL);
2150
2151 /* release the device */
2152 /* (this will call gspca_release() immediatly or on last close) */
2153 video_unregister_device(&gspca_dev->vdev);
2154
2155 /* PDEBUG(D_PROBE, "disconnect complete"); */
2156 }
2157 EXPORT_SYMBOL(gspca_disconnect);
2158
2159 #ifdef CONFIG_PM
2160 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2161 {
2162 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2163
2164 if (!gspca_dev->streaming)
2165 return 0;
2166 gspca_dev->frozen = 1; /* avoid urb error messages */
2167 if (gspca_dev->sd_desc->stopN)
2168 gspca_dev->sd_desc->stopN(gspca_dev);
2169 destroy_urbs(gspca_dev);
2170 gspca_set_alt0(gspca_dev);
2171 if (gspca_dev->sd_desc->stop0)
2172 gspca_dev->sd_desc->stop0(gspca_dev);
2173 return 0;
2174 }
2175 EXPORT_SYMBOL(gspca_suspend);
2176
2177 int gspca_resume(struct usb_interface *intf)
2178 {
2179 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2180
2181 gspca_dev->frozen = 0;
2182 gspca_dev->sd_desc->init(gspca_dev);
2183 if (gspca_dev->streaming)
2184 return gspca_init_transfer(gspca_dev);
2185 return 0;
2186 }
2187 EXPORT_SYMBOL(gspca_resume);
2188 #endif
2189 /* -- cam driver utility functions -- */
2190
2191 /* auto gain and exposure algorithm based on the knee algorithm described here:
2192 http://ytse.tricolour.net/docs/LowLightOptimization.html
2193
2194 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2195 where changed. */
2196 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2197 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2198 {
2199 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2200 const struct ctrl *gain_ctrl = NULL;
2201 const struct ctrl *exposure_ctrl = NULL;
2202 const struct ctrl *autogain_ctrl = NULL;
2203 int retval = 0;
2204
2205 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2206 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2207 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2208 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2209 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2210 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2211 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2212 }
2213 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2214 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2215 "on cam without (auto)gain/exposure");
2216 return 0;
2217 }
2218
2219 if (gain_ctrl->get(gspca_dev, &gain) ||
2220 exposure_ctrl->get(gspca_dev, &exposure) ||
2221 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2222 return 0;
2223
2224 orig_gain = gain;
2225 orig_exposure = exposure;
2226
2227 /* If we are of a multiple of deadzone, do multiple steps to reach the
2228 desired lumination fast (with the risc of a slight overshoot) */
2229 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2230
2231 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2232 avg_lum, desired_avg_lum, steps);
2233
2234 for (i = 0; i < steps; i++) {
2235 if (avg_lum > desired_avg_lum) {
2236 if (gain > gain_knee)
2237 gain--;
2238 else if (exposure > exposure_knee)
2239 exposure--;
2240 else if (gain > gain_ctrl->qctrl.default_value)
2241 gain--;
2242 else if (exposure > exposure_ctrl->qctrl.minimum)
2243 exposure--;
2244 else if (gain > gain_ctrl->qctrl.minimum)
2245 gain--;
2246 else
2247 break;
2248 } else {
2249 if (gain < gain_ctrl->qctrl.default_value)
2250 gain++;
2251 else if (exposure < exposure_knee)
2252 exposure++;
2253 else if (gain < gain_knee)
2254 gain++;
2255 else if (exposure < exposure_ctrl->qctrl.maximum)
2256 exposure++;
2257 else if (gain < gain_ctrl->qctrl.maximum)
2258 gain++;
2259 else
2260 break;
2261 }
2262 }
2263
2264 if (gain != orig_gain) {
2265 gain_ctrl->set(gspca_dev, gain);
2266 retval = 1;
2267 }
2268 if (exposure != orig_exposure) {
2269 exposure_ctrl->set(gspca_dev, exposure);
2270 retval = 1;
2271 }
2272
2273 return retval;
2274 }
2275 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2276
2277 /* -- module insert / remove -- */
2278 static int __init gspca_init(void)
2279 {
2280 info("main v%d.%d.%d registered",
2281 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2282 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2283 DRIVER_VERSION_NUMBER & 0xff);
2284 return 0;
2285 }
2286 static void __exit gspca_exit(void)
2287 {
2288 info("main deregistered");
2289 }
2290
2291 module_init(gspca_init);
2292 module_exit(gspca_exit);
2293
2294 #ifdef GSPCA_DEBUG
2295 module_param_named(debug, gspca_debug, int, 0644);
2296 MODULE_PARM_DESC(debug,
2297 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2298 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2299 " 0x0100: v4l2");
2300 #endif
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