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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
37
38 #include "gspca.h"
39
40 /* global values */
41 #define DEF_NURBS 2 /* default number of URBs */
42
43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
45 MODULE_LICENSE("GPL");
46
47 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 4, 0)
48
49 static int video_nr = -1;
50
51 #ifdef GSPCA_DEBUG
52 int gspca_debug = D_ERR | D_PROBE;
53 EXPORT_SYMBOL(gspca_debug);
54
55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
56 {
57 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
58 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
59 txt,
60 pixfmt & 0xff,
61 (pixfmt >> 8) & 0xff,
62 (pixfmt >> 16) & 0xff,
63 pixfmt >> 24,
64 w, h);
65 } else {
66 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
67 txt,
68 pixfmt,
69 w, h);
70 }
71 }
72 #else
73 #define PDEBUG_MODE(txt, pixfmt, w, h)
74 #endif
75
76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
77 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
78 #define GSPCA_MEMORY_READ 7
79
80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
81
82 /*
83 * VMA operations.
84 */
85 static void gspca_vm_open(struct vm_area_struct *vma)
86 {
87 struct gspca_frame *frame = vma->vm_private_data;
88
89 frame->vma_use_count++;
90 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
91 }
92
93 static void gspca_vm_close(struct vm_area_struct *vma)
94 {
95 struct gspca_frame *frame = vma->vm_private_data;
96
97 if (--frame->vma_use_count <= 0)
98 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
99 }
100
101 static struct vm_operations_struct gspca_vm_ops = {
102 .open = gspca_vm_open,
103 .close = gspca_vm_close,
104 };
105
106 /* get the current input frame buffer */
107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
108 {
109 struct gspca_frame *frame;
110 int i;
111
112 i = gspca_dev->fr_i;
113 i = gspca_dev->fr_queue[i];
114 frame = &gspca_dev->frame[i];
115 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
116 != V4L2_BUF_FLAG_QUEUED)
117 return NULL;
118 return frame;
119 }
120 EXPORT_SYMBOL(gspca_get_i_frame);
121
122 /*
123 * fill a video frame from an URB and resubmit
124 */
125 static void fill_frame(struct gspca_dev *gspca_dev,
126 struct urb *urb)
127 {
128 struct gspca_frame *frame;
129 __u8 *data; /* address of data in the iso message */
130 int i, len, st;
131 cam_pkt_op pkt_scan;
132
133 if (urb->status != 0) {
134 #ifdef CONFIG_PM
135 if (!gspca_dev->frozen)
136 #endif
137 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
138 return; /* disconnection ? */
139 }
140 pkt_scan = gspca_dev->sd_desc->pkt_scan;
141 for (i = 0; i < urb->number_of_packets; i++) {
142
143 /* check the availability of the frame buffer */
144 frame = gspca_get_i_frame(gspca_dev);
145 if (!frame) {
146 gspca_dev->last_packet_type = DISCARD_PACKET;
147 break;
148 }
149
150 /* check the packet status and length */
151 len = urb->iso_frame_desc[i].actual_length;
152 if (len == 0) {
153 if (gspca_dev->empty_packet == 0)
154 gspca_dev->empty_packet = 1;
155 continue;
156 }
157 st = urb->iso_frame_desc[i].status;
158 if (st) {
159 PDEBUG(D_ERR,
160 "ISOC data error: [%d] len=%d, status=%d",
161 i, len, st);
162 gspca_dev->last_packet_type = DISCARD_PACKET;
163 continue;
164 }
165
166 /* let the packet be analyzed by the subdriver */
167 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
168 i, urb->iso_frame_desc[i].offset, len);
169 data = (__u8 *) urb->transfer_buffer
170 + urb->iso_frame_desc[i].offset;
171 pkt_scan(gspca_dev, frame, data, len);
172 }
173
174 /* resubmit the URB */
175 st = usb_submit_urb(urb, GFP_ATOMIC);
176 if (st < 0)
177 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
178 }
179
180 /*
181 * ISOC message interrupt from the USB device
182 *
183 * Analyse each packet and call the subdriver for copy to the frame buffer.
184 */
185 static void isoc_irq(struct urb *urb
186 )
187 {
188 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
189
190 PDEBUG(D_PACK, "isoc irq");
191 if (!gspca_dev->streaming)
192 return;
193 fill_frame(gspca_dev, urb);
194 }
195
196 /*
197 * bulk message interrupt from the USB device
198 */
199 static void bulk_irq(struct urb *urb
200 )
201 {
202 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
203 struct gspca_frame *frame;
204 int st;
205
206 PDEBUG(D_PACK, "bulk irq");
207 if (!gspca_dev->streaming)
208 return;
209 switch (urb->status) {
210 case 0:
211 break;
212 case -ECONNRESET:
213 urb->status = 0;
214 break;
215 default:
216 #ifdef CONFIG_PM
217 if (!gspca_dev->frozen)
218 #endif
219 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
220 return; /* disconnection ? */
221 }
222
223 /* check the availability of the frame buffer */
224 frame = gspca_get_i_frame(gspca_dev);
225 if (!frame) {
226 gspca_dev->last_packet_type = DISCARD_PACKET;
227 } else {
228 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
229 gspca_dev->sd_desc->pkt_scan(gspca_dev,
230 frame,
231 urb->transfer_buffer,
232 urb->actual_length);
233 }
234
235 /* resubmit the URB */
236 if (gspca_dev->cam.bulk_nurbs != 0) {
237 st = usb_submit_urb(urb, GFP_ATOMIC);
238 if (st < 0)
239 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
240 }
241 }
242
243 /*
244 * add data to the current frame
245 *
246 * This function is called by the subdrivers at interrupt level.
247 *
248 * To build a frame, these ones must add
249 * - one FIRST_PACKET
250 * - 0 or many INTER_PACKETs
251 * - one LAST_PACKET
252 * DISCARD_PACKET invalidates the whole frame.
253 * On LAST_PACKET, a new frame is returned.
254 */
255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
256 enum gspca_packet_type packet_type,
257 struct gspca_frame *frame,
258 const __u8 *data,
259 int len)
260 {
261 int i, j;
262
263 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
264
265 /* when start of a new frame, if the current frame buffer
266 * is not queued, discard the whole frame */
267 if (packet_type == FIRST_PACKET) {
268 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
269 != V4L2_BUF_FLAG_QUEUED) {
270 gspca_dev->last_packet_type = DISCARD_PACKET;
271 return frame;
272 }
273 frame->data_end = frame->data;
274 jiffies_to_timeval(get_jiffies_64(),
275 &frame->v4l2_buf.timestamp);
276 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
277 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
278 if (packet_type == LAST_PACKET)
279 gspca_dev->last_packet_type = packet_type;
280 return frame;
281 }
282
283 /* append the packet to the frame buffer */
284 if (len > 0) {
285 if (frame->data_end - frame->data + len
286 > frame->v4l2_buf.length) {
287 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
288 frame->data_end - frame->data + len,
289 frame->v4l2_buf.length);
290 packet_type = DISCARD_PACKET;
291 } else {
292 memcpy(frame->data_end, data, len);
293 frame->data_end += len;
294 }
295 }
296 gspca_dev->last_packet_type = packet_type;
297
298 /* if last packet, wake up the application and advance in the queue */
299 if (packet_type == LAST_PACKET) {
300 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
301 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
302 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
303 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
304 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
305 gspca_dev->fr_i = i;
306 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
307 frame->v4l2_buf.bytesused,
308 gspca_dev->fr_q,
309 i,
310 gspca_dev->fr_o);
311 j = gspca_dev->fr_queue[i];
312 frame = &gspca_dev->frame[j];
313 }
314 return frame;
315 }
316 EXPORT_SYMBOL(gspca_frame_add);
317
318 static int gspca_is_compressed(__u32 format)
319 {
320 switch (format) {
321 case V4L2_PIX_FMT_MJPEG:
322 case V4L2_PIX_FMT_JPEG:
323 case V4L2_PIX_FMT_SPCA561:
324 case V4L2_PIX_FMT_PAC207:
325 return 1;
326 }
327 return 0;
328 }
329
330 static void *rvmalloc(unsigned long size)
331 {
332 void *mem;
333 unsigned long adr;
334
335 mem = vmalloc_32(size);
336 if (mem != NULL) {
337 adr = (unsigned long) mem;
338 while ((long) size > 0) {
339 SetPageReserved(vmalloc_to_page((void *) adr));
340 adr += PAGE_SIZE;
341 size -= PAGE_SIZE;
342 }
343 }
344 return mem;
345 }
346
347 static void rvfree(void *mem, long size)
348 {
349 unsigned long adr;
350
351 adr = (unsigned long) mem;
352 while (size > 0) {
353 ClearPageReserved(vmalloc_to_page((void *) adr));
354 adr += PAGE_SIZE;
355 size -= PAGE_SIZE;
356 }
357 vfree(mem);
358 }
359
360 static int frame_alloc(struct gspca_dev *gspca_dev,
361 unsigned int count)
362 {
363 struct gspca_frame *frame;
364 unsigned int frsz;
365 int i;
366
367 i = gspca_dev->curr_mode;
368 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
369 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
370 frsz = PAGE_ALIGN(frsz);
371 gspca_dev->frsz = frsz;
372 if (count > GSPCA_MAX_FRAMES)
373 count = GSPCA_MAX_FRAMES;
374 gspca_dev->frbuf = rvmalloc(frsz * count);
375 if (!gspca_dev->frbuf) {
376 err("frame alloc failed");
377 return -ENOMEM;
378 }
379 gspca_dev->nframes = count;
380 for (i = 0; i < count; i++) {
381 frame = &gspca_dev->frame[i];
382 frame->v4l2_buf.index = i;
383 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
384 frame->v4l2_buf.flags = 0;
385 frame->v4l2_buf.field = V4L2_FIELD_NONE;
386 frame->v4l2_buf.length = frsz;
387 frame->v4l2_buf.memory = gspca_dev->memory;
388 frame->v4l2_buf.sequence = 0;
389 frame->data = frame->data_end =
390 gspca_dev->frbuf + i * frsz;
391 frame->v4l2_buf.m.offset = i * frsz;
392 }
393 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
394 gspca_dev->last_packet_type = DISCARD_PACKET;
395 gspca_dev->sequence = 0;
396 return 0;
397 }
398
399 static void frame_free(struct gspca_dev *gspca_dev)
400 {
401 int i;
402
403 PDEBUG(D_STREAM, "frame free");
404 if (gspca_dev->frbuf != NULL) {
405 rvfree(gspca_dev->frbuf,
406 gspca_dev->nframes * gspca_dev->frsz);
407 gspca_dev->frbuf = NULL;
408 for (i = 0; i < gspca_dev->nframes; i++)
409 gspca_dev->frame[i].data = NULL;
410 }
411 gspca_dev->nframes = 0;
412 }
413
414 static void destroy_urbs(struct gspca_dev *gspca_dev)
415 {
416 struct urb *urb;
417 unsigned int i;
418
419 PDEBUG(D_STREAM, "kill transfer");
420 for (i = 0; i < MAX_NURBS; i++) {
421 urb = gspca_dev->urb[i];
422 if (urb == NULL)
423 break;
424
425 BUG_ON(!gspca_dev->dev);
426 gspca_dev->urb[i] = NULL;
427 if (!gspca_dev->present)
428 usb_kill_urb(urb);
429 if (urb->transfer_buffer != NULL)
430 usb_buffer_free(gspca_dev->dev,
431 urb->transfer_buffer_length,
432 urb->transfer_buffer,
433 urb->transfer_dma);
434 usb_free_urb(urb);
435 }
436 }
437
438 /*
439 * look for an input transfer endpoint in an alternate setting
440 */
441 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
442 __u8 epaddr,
443 __u8 xfer)
444 {
445 struct usb_host_endpoint *ep;
446 int i, attr;
447
448 epaddr |= USB_DIR_IN;
449 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
450 ep = &alt->endpoint[i];
451 if (ep->desc.bEndpointAddress == epaddr) {
452 attr = ep->desc.bmAttributes
453 & USB_ENDPOINT_XFERTYPE_MASK;
454 if (attr == xfer)
455 return ep;
456 break;
457 }
458 }
459 return NULL;
460 }
461
462 /*
463 * look for an input (isoc or bulk) endpoint
464 *
465 * The endpoint is defined by the subdriver.
466 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
467 * This routine may be called many times when the bandwidth is too small
468 * (the bandwidth is checked on urb submit).
469 */
470 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
471 {
472 struct usb_interface *intf;
473 struct usb_host_endpoint *ep;
474 int i, ret;
475
476 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
477 ep = NULL;
478 i = gspca_dev->alt; /* previous alt setting */
479
480 /* try isoc */
481 while (--i > 0) { /* alt 0 is unusable */
482 ep = alt_xfer(&intf->altsetting[i],
483 gspca_dev->cam.epaddr,
484 USB_ENDPOINT_XFER_ISOC);
485 if (ep)
486 break;
487 }
488
489 /* if no isoc, try bulk */
490 if (ep == NULL) {
491 ep = alt_xfer(&intf->altsetting[0],
492 gspca_dev->cam.epaddr,
493 USB_ENDPOINT_XFER_BULK);
494 if (ep == NULL) {
495 err("no transfer endpoint found");
496 return NULL;
497 }
498 }
499 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
500 i, ep->desc.bEndpointAddress);
501 if (i > 0) {
502 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
503 if (ret < 0) {
504 err("set interface err %d", ret);
505 return NULL;
506 }
507 }
508 gspca_dev->alt = i; /* memorize the current alt setting */
509 return ep;
510 }
511
512 /*
513 * create the URBs for image transfer
514 */
515 static int create_urbs(struct gspca_dev *gspca_dev,
516 struct usb_host_endpoint *ep)
517 {
518 struct urb *urb;
519 int n, nurbs, i, psize, npkt, bsize;
520
521 /* calculate the packet size and the number of packets */
522 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
523
524 if (gspca_dev->alt != 0) { /* isoc */
525
526 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
527 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
528 npkt = ISO_MAX_SIZE / psize;
529 if (npkt > ISO_MAX_PKT)
530 npkt = ISO_MAX_PKT;
531 bsize = psize * npkt;
532 PDEBUG(D_STREAM,
533 "isoc %d pkts size %d = bsize:%d",
534 npkt, psize, bsize);
535 nurbs = DEF_NURBS;
536 } else { /* bulk */
537 npkt = 0;
538 bsize = gspca_dev->cam.bulk_size;
539 if (bsize == 0)
540 bsize = psize;
541 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
542 if (gspca_dev->cam.bulk_nurbs != 0)
543 nurbs = gspca_dev->cam.bulk_nurbs;
544 else
545 nurbs = 1;
546 }
547
548 gspca_dev->nurbs = nurbs;
549 for (n = 0; n < nurbs; n++) {
550 urb = usb_alloc_urb(npkt, GFP_KERNEL);
551 if (!urb) {
552 err("usb_alloc_urb failed");
553 destroy_urbs(gspca_dev);
554 return -ENOMEM;
555 }
556 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
557 bsize,
558 GFP_KERNEL,
559 &urb->transfer_dma);
560
561 if (urb->transfer_buffer == NULL) {
562 usb_free_urb(urb);
563 err("usb_buffer_urb failed");
564 destroy_urbs(gspca_dev);
565 return -ENOMEM;
566 }
567 gspca_dev->urb[n] = urb;
568 urb->dev = gspca_dev->dev;
569 urb->context = gspca_dev;
570 urb->transfer_buffer_length = bsize;
571 if (npkt != 0) { /* ISOC */
572 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
573 ep->desc.bEndpointAddress);
574 urb->transfer_flags = URB_ISO_ASAP
575 | URB_NO_TRANSFER_DMA_MAP;
576 urb->interval = ep->desc.bInterval;
577 urb->complete = isoc_irq;
578 urb->number_of_packets = npkt;
579 for (i = 0; i < npkt; i++) {
580 urb->iso_frame_desc[i].length = psize;
581 urb->iso_frame_desc[i].offset = psize * i;
582 }
583 } else { /* bulk */
584 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
585 ep->desc.bEndpointAddress),
586 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
587 urb->complete = bulk_irq;
588 }
589 }
590 return 0;
591 }
592
593 /*
594 * start the USB transfer
595 */
596 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
597 {
598 struct usb_host_endpoint *ep;
599 int n, ret;
600
601 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
602 return -ERESTARTSYS;
603
604 /* set the higher alternate setting and
605 * loop until urb submit succeeds */
606 gspca_dev->alt = gspca_dev->nbalt;
607 for (;;) {
608 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
609 ep = get_ep(gspca_dev);
610 if (ep == NULL) {
611 ret = -EIO;
612 goto out;
613 }
614 ret = create_urbs(gspca_dev, ep);
615 if (ret < 0)
616 goto out;
617
618 /* clear the bulk endpoint */
619 if (gspca_dev->alt == 0) /* if bulk transfer */
620 usb_clear_halt(gspca_dev->dev,
621 usb_rcvintpipe(gspca_dev->dev,
622 gspca_dev->cam.epaddr));
623
624 /* start the cam */
625 ret = gspca_dev->sd_desc->start(gspca_dev);
626 if (ret < 0) {
627 destroy_urbs(gspca_dev);
628 goto out;
629 }
630 gspca_dev->streaming = 1;
631
632 /* some bulk transfers are started by the subdriver */
633 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
634 break;
635
636 /* submit the URBs */
637 for (n = 0; n < gspca_dev->nurbs; n++) {
638 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
639 if (ret < 0) {
640 PDEBUG(D_ERR|D_STREAM,
641 "usb_submit_urb [%d] err %d", n, ret);
642 gspca_dev->streaming = 0;
643 destroy_urbs(gspca_dev);
644 if (ret == -ENOSPC) {
645 msleep(20); /* wait for kill
646 * complete */
647 break; /* try the previous alt */
648 }
649 goto out;
650 }
651 }
652 if (ret >= 0)
653 break;
654 }
655 out:
656 mutex_unlock(&gspca_dev->usb_lock);
657 return ret;
658 }
659
660 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
661 {
662 int ret;
663
664 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
665 if (ret < 0)
666 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
667 return ret;
668 }
669
670 /* Note: both the queue and the usb locks should be held when calling this */
671 static void gspca_stream_off(struct gspca_dev *gspca_dev)
672 {
673 gspca_dev->streaming = 0;
674 if (gspca_dev->present
675 && gspca_dev->sd_desc->stopN)
676 gspca_dev->sd_desc->stopN(gspca_dev);
677 destroy_urbs(gspca_dev);
678 gspca_set_alt0(gspca_dev);
679 if (gspca_dev->sd_desc->stop0)
680 gspca_dev->sd_desc->stop0(gspca_dev);
681 PDEBUG(D_STREAM, "stream off OK");
682 }
683
684 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
685 {
686 int i;
687
688 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
689 gspca_dev->curr_mode = i;
690 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
691 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
692 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
693 }
694
695 static int wxh_to_mode(struct gspca_dev *gspca_dev,
696 int width, int height)
697 {
698 int i;
699
700 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
701 if (width >= gspca_dev->cam.cam_mode[i].width
702 && height >= gspca_dev->cam.cam_mode[i].height)
703 break;
704 }
705 return i;
706 }
707
708 /*
709 * search a mode with the right pixel format
710 */
711 static int gspca_get_mode(struct gspca_dev *gspca_dev,
712 int mode,
713 int pixfmt)
714 {
715 int modeU, modeD;
716
717 modeU = modeD = mode;
718 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
719 if (--modeD >= 0) {
720 if (gspca_dev->cam.cam_mode[modeD].pixelformat
721 == pixfmt)
722 return modeD;
723 }
724 if (++modeU < gspca_dev->cam.nmodes) {
725 if (gspca_dev->cam.cam_mode[modeU].pixelformat
726 == pixfmt)
727 return modeU;
728 }
729 }
730 return -EINVAL;
731 }
732
733 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
734 struct v4l2_fmtdesc *fmtdesc)
735 {
736 struct gspca_dev *gspca_dev = priv;
737 int i, j, index;
738 __u32 fmt_tb[8];
739
740 /* give an index to each format */
741 index = 0;
742 j = 0;
743 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
744 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
745 j = 0;
746 for (;;) {
747 if (fmt_tb[j] == fmt_tb[index])
748 break;
749 j++;
750 }
751 if (j == index) {
752 if (fmtdesc->index == index)
753 break; /* new format */
754 index++;
755 if (index >= ARRAY_SIZE(fmt_tb))
756 return -EINVAL;
757 }
758 }
759 if (i < 0)
760 return -EINVAL; /* no more format */
761
762 fmtdesc->pixelformat = fmt_tb[index];
763 if (gspca_is_compressed(fmt_tb[index]))
764 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
765 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
766 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
767 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
768 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
769 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
770 fmtdesc->description[4] = '\0';
771 return 0;
772 }
773
774 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
775 struct v4l2_format *fmt)
776 {
777 struct gspca_dev *gspca_dev = priv;
778 int mode;
779
780 mode = gspca_dev->curr_mode;
781 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
782 sizeof fmt->fmt.pix);
783 return 0;
784 }
785
786 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
787 struct v4l2_format *fmt)
788 {
789 int w, h, mode, mode2;
790
791 w = fmt->fmt.pix.width;
792 h = fmt->fmt.pix.height;
793
794 #ifdef GSPCA_DEBUG
795 if (gspca_debug & D_CONF)
796 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
797 #endif
798 /* search the closest mode for width and height */
799 mode = wxh_to_mode(gspca_dev, w, h);
800
801 /* OK if right palette */
802 if (gspca_dev->cam.cam_mode[mode].pixelformat
803 != fmt->fmt.pix.pixelformat) {
804
805 /* else, search the closest mode with the same pixel format */
806 mode2 = gspca_get_mode(gspca_dev, mode,
807 fmt->fmt.pix.pixelformat);
808 if (mode2 >= 0)
809 mode = mode2;
810 /* else
811 ; * no chance, return this mode */
812 }
813 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
814 sizeof fmt->fmt.pix);
815 return mode; /* used when s_fmt */
816 }
817
818 static int vidioc_try_fmt_vid_cap(struct file *file,
819 void *priv,
820 struct v4l2_format *fmt)
821 {
822 struct gspca_dev *gspca_dev = priv;
823 int ret;
824
825 ret = try_fmt_vid_cap(gspca_dev, fmt);
826 if (ret < 0)
827 return ret;
828 return 0;
829 }
830
831 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
832 struct v4l2_format *fmt)
833 {
834 struct gspca_dev *gspca_dev = priv;
835 int ret;
836
837 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
838 return -ERESTARTSYS;
839
840 ret = try_fmt_vid_cap(gspca_dev, fmt);
841 if (ret < 0)
842 goto out;
843
844 if (gspca_dev->nframes != 0
845 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
846 ret = -EINVAL;
847 goto out;
848 }
849
850 if (ret == gspca_dev->curr_mode) {
851 ret = 0;
852 goto out; /* same mode */
853 }
854
855 if (gspca_dev->streaming) {
856 ret = -EBUSY;
857 goto out;
858 }
859 gspca_dev->width = fmt->fmt.pix.width;
860 gspca_dev->height = fmt->fmt.pix.height;
861 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
862 gspca_dev->curr_mode = ret;
863
864 ret = 0;
865 out:
866 mutex_unlock(&gspca_dev->queue_lock);
867 return ret;
868 }
869
870 static void gspca_release(struct video_device *vfd)
871 {
872 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
873
874 PDEBUG(D_STREAM, "device released");
875
876 kfree(gspca_dev->usb_buf);
877 kfree(gspca_dev);
878 }
879
880 static int dev_open(struct file *file)
881 {
882 struct gspca_dev *gspca_dev;
883 int ret;
884
885 PDEBUG(D_STREAM, "%s open", current->comm);
886 gspca_dev = (struct gspca_dev *) video_devdata(file);
887 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
888 return -ERESTARTSYS;
889 if (!gspca_dev->present) {
890 ret = -ENODEV;
891 goto out;
892 }
893
894 if (gspca_dev->users > 4) { /* (arbitrary value) */
895 ret = -EBUSY;
896 goto out;
897 }
898
899 /* protect the subdriver against rmmod */
900 if (!try_module_get(gspca_dev->module)) {
901 ret = -ENODEV;
902 goto out;
903 }
904
905 gspca_dev->users++;
906
907 file->private_data = gspca_dev;
908 #ifdef GSPCA_DEBUG
909 /* activate the v4l2 debug */
910 if (gspca_debug & D_V4L2)
911 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
912 | V4L2_DEBUG_IOCTL_ARG;
913 else
914 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
915 | V4L2_DEBUG_IOCTL_ARG);
916 #endif
917 ret = 0;
918 out:
919 mutex_unlock(&gspca_dev->queue_lock);
920 if (ret != 0)
921 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
922 else
923 PDEBUG(D_STREAM, "open done");
924 return ret;
925 }
926
927 static int dev_close(struct file *file)
928 {
929 struct gspca_dev *gspca_dev = file->private_data;
930
931 PDEBUG(D_STREAM, "%s close", current->comm);
932 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
933 return -ERESTARTSYS;
934 gspca_dev->users--;
935
936 /* if the file did the capture, free the streaming resources */
937 if (gspca_dev->capt_file == file) {
938 if (gspca_dev->streaming) {
939 mutex_lock(&gspca_dev->usb_lock);
940 gspca_stream_off(gspca_dev);
941 mutex_unlock(&gspca_dev->usb_lock);
942 }
943 frame_free(gspca_dev);
944 gspca_dev->capt_file = NULL;
945 gspca_dev->memory = GSPCA_MEMORY_NO;
946 }
947 file->private_data = NULL;
948 module_put(gspca_dev->module);
949 mutex_unlock(&gspca_dev->queue_lock);
950
951 PDEBUG(D_STREAM, "close done");
952
953 return 0;
954 }
955
956 static int vidioc_querycap(struct file *file, void *priv,
957 struct v4l2_capability *cap)
958 {
959 struct gspca_dev *gspca_dev = priv;
960
961 memset(cap, 0, sizeof *cap);
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 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
973 sizeof cap->bus_info);
974 cap->version = DRIVER_VERSION_NUMBER;
975 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
976 | V4L2_CAP_STREAMING
977 | V4L2_CAP_READWRITE;
978 return 0;
979 }
980
981 static int vidioc_queryctrl(struct file *file, void *priv,
982 struct v4l2_queryctrl *q_ctrl)
983 {
984 struct gspca_dev *gspca_dev = priv;
985 int i, ix;
986 u32 id;
987
988 ix = -1;
989 id = q_ctrl->id;
990 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
991 id &= V4L2_CTRL_ID_MASK;
992 id++;
993 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
994 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
995 continue;
996 if (ix < 0) {
997 ix = i;
998 continue;
999 }
1000 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1001 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1002 continue;
1003 ix = i;
1004 }
1005 }
1006 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1007 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1008 ix = i;
1009 break;
1010 }
1011 }
1012 if (ix < 0)
1013 return -EINVAL;
1014 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1015 sizeof *q_ctrl);
1016 if (gspca_dev->ctrl_dis & (1 << ix))
1017 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1018 return 0;
1019 }
1020
1021 static int vidioc_s_ctrl(struct file *file, void *priv,
1022 struct v4l2_control *ctrl)
1023 {
1024 struct gspca_dev *gspca_dev = priv;
1025 const struct ctrl *ctrls;
1026 int i, ret;
1027
1028 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1029 i < gspca_dev->sd_desc->nctrls;
1030 i++, ctrls++) {
1031 if (ctrl->id != ctrls->qctrl.id)
1032 continue;
1033 if (gspca_dev->ctrl_dis & (1 << i))
1034 return -EINVAL;
1035 if (ctrl->value < ctrls->qctrl.minimum
1036 || ctrl->value > ctrls->qctrl.maximum)
1037 return -ERANGE;
1038 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1039 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1040 return -ERESTARTSYS;
1041 ret = ctrls->set(gspca_dev, ctrl->value);
1042 mutex_unlock(&gspca_dev->usb_lock);
1043 return ret;
1044 }
1045 return -EINVAL;
1046 }
1047
1048 static int vidioc_g_ctrl(struct file *file, void *priv,
1049 struct v4l2_control *ctrl)
1050 {
1051 struct gspca_dev *gspca_dev = priv;
1052
1053 const struct ctrl *ctrls;
1054 int i, ret;
1055
1056 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1057 i < gspca_dev->sd_desc->nctrls;
1058 i++, ctrls++) {
1059 if (ctrl->id != ctrls->qctrl.id)
1060 continue;
1061 if (gspca_dev->ctrl_dis & (1 << i))
1062 return -EINVAL;
1063 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1064 return -ERESTARTSYS;
1065 ret = ctrls->get(gspca_dev, &ctrl->value);
1066 mutex_unlock(&gspca_dev->usb_lock);
1067 return ret;
1068 }
1069 return -EINVAL;
1070 }
1071
1072 /*fixme: have an audio flag in gspca_dev?*/
1073 static int vidioc_s_audio(struct file *file, void *priv,
1074 struct v4l2_audio *audio)
1075 {
1076 if (audio->index != 0)
1077 return -EINVAL;
1078 return 0;
1079 }
1080
1081 static int vidioc_g_audio(struct file *file, void *priv,
1082 struct v4l2_audio *audio)
1083 {
1084 memset(audio, 0, sizeof *audio);
1085 strcpy(audio->name, "Microphone");
1086 return 0;
1087 }
1088
1089 static int vidioc_enumaudio(struct file *file, void *priv,
1090 struct v4l2_audio *audio)
1091 {
1092 if (audio->index != 0)
1093 return -EINVAL;
1094
1095 strcpy(audio->name, "Microphone");
1096 audio->capability = 0;
1097 audio->mode = 0;
1098 return 0;
1099 }
1100
1101 static int vidioc_querymenu(struct file *file, void *priv,
1102 struct v4l2_querymenu *qmenu)
1103 {
1104 struct gspca_dev *gspca_dev = priv;
1105
1106 if (!gspca_dev->sd_desc->querymenu)
1107 return -EINVAL;
1108 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1109 }
1110
1111 static int vidioc_enum_input(struct file *file, void *priv,
1112 struct v4l2_input *input)
1113 {
1114 struct gspca_dev *gspca_dev = priv;
1115
1116 if (input->index != 0)
1117 return -EINVAL;
1118 memset(input, 0, sizeof *input);
1119 input->type = V4L2_INPUT_TYPE_CAMERA;
1120 strncpy(input->name, gspca_dev->sd_desc->name,
1121 sizeof input->name);
1122 return 0;
1123 }
1124
1125 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1126 {
1127 *i = 0;
1128 return 0;
1129 }
1130
1131 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1132 {
1133 if (i > 0)
1134 return -EINVAL;
1135 return (0);
1136 }
1137
1138 static int vidioc_reqbufs(struct file *file, void *priv,
1139 struct v4l2_requestbuffers *rb)
1140 {
1141 struct gspca_dev *gspca_dev = priv;
1142 int i, ret = 0;
1143
1144 switch (rb->memory) {
1145 case GSPCA_MEMORY_READ: /* (internal call) */
1146 case V4L2_MEMORY_MMAP:
1147 case V4L2_MEMORY_USERPTR:
1148 break;
1149 default:
1150 return -EINVAL;
1151 }
1152 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1153 return -ERESTARTSYS;
1154
1155 if (gspca_dev->memory != GSPCA_MEMORY_NO
1156 && gspca_dev->memory != rb->memory) {
1157 ret = -EBUSY;
1158 goto out;
1159 }
1160
1161 /* only one file may do the capture */
1162 if (gspca_dev->capt_file != NULL
1163 && gspca_dev->capt_file != file) {
1164 ret = -EBUSY;
1165 goto out;
1166 }
1167
1168 /* if allocated, the buffers must not be mapped */
1169 for (i = 0; i < gspca_dev->nframes; i++) {
1170 if (gspca_dev->frame[i].vma_use_count) {
1171 ret = -EBUSY;
1172 goto out;
1173 }
1174 }
1175
1176 /* stop streaming */
1177 if (gspca_dev->streaming) {
1178 mutex_lock(&gspca_dev->usb_lock);
1179 gspca_stream_off(gspca_dev);
1180 mutex_unlock(&gspca_dev->usb_lock);
1181 }
1182
1183 /* free the previous allocated buffers, if any */
1184 if (gspca_dev->nframes != 0) {
1185 frame_free(gspca_dev);
1186 gspca_dev->capt_file = NULL;
1187 }
1188 if (rb->count == 0) /* unrequest */
1189 goto out;
1190 gspca_dev->memory = rb->memory;
1191 ret = frame_alloc(gspca_dev, rb->count);
1192 if (ret == 0) {
1193 rb->count = gspca_dev->nframes;
1194 gspca_dev->capt_file = file;
1195 }
1196 out:
1197 mutex_unlock(&gspca_dev->queue_lock);
1198 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1199 return ret;
1200 }
1201
1202 static int vidioc_querybuf(struct file *file, void *priv,
1203 struct v4l2_buffer *v4l2_buf)
1204 {
1205 struct gspca_dev *gspca_dev = priv;
1206 struct gspca_frame *frame;
1207
1208 if (v4l2_buf->index < 0
1209 || v4l2_buf->index >= gspca_dev->nframes)
1210 return -EINVAL;
1211
1212 frame = &gspca_dev->frame[v4l2_buf->index];
1213 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1214 return 0;
1215 }
1216
1217 static int vidioc_streamon(struct file *file, void *priv,
1218 enum v4l2_buf_type buf_type)
1219 {
1220 struct gspca_dev *gspca_dev = priv;
1221 int ret;
1222
1223 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1224 return -EINVAL;
1225 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1226 return -ERESTARTSYS;
1227 if (!gspca_dev->present) {
1228 ret = -ENODEV;
1229 goto out;
1230 }
1231 if (gspca_dev->nframes == 0
1232 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1233 ret = -EINVAL;
1234 goto out;
1235 }
1236 if (!gspca_dev->streaming) {
1237 ret = gspca_init_transfer(gspca_dev);
1238 if (ret < 0)
1239 goto out;
1240 }
1241 #ifdef GSPCA_DEBUG
1242 if (gspca_debug & D_STREAM) {
1243 PDEBUG_MODE("stream on OK",
1244 gspca_dev->pixfmt,
1245 gspca_dev->width,
1246 gspca_dev->height);
1247 }
1248 #endif
1249 ret = 0;
1250 out:
1251 mutex_unlock(&gspca_dev->queue_lock);
1252 return ret;
1253 }
1254
1255 static int vidioc_streamoff(struct file *file, void *priv,
1256 enum v4l2_buf_type buf_type)
1257 {
1258 struct gspca_dev *gspca_dev = priv;
1259 int i, ret;
1260
1261 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1262 return -EINVAL;
1263 if (!gspca_dev->streaming)
1264 return 0;
1265 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1266 return -ERESTARTSYS;
1267
1268 /* stop streaming */
1269 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1270 ret = -ERESTARTSYS;
1271 goto out;
1272 }
1273 gspca_stream_off(gspca_dev);
1274 mutex_unlock(&gspca_dev->usb_lock);
1275
1276 /* empty the application queues */
1277 for (i = 0; i < gspca_dev->nframes; i++)
1278 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1279 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1280 gspca_dev->last_packet_type = DISCARD_PACKET;
1281 gspca_dev->sequence = 0;
1282 ret = 0;
1283 out:
1284 mutex_unlock(&gspca_dev->queue_lock);
1285 return ret;
1286 }
1287
1288 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1289 struct v4l2_jpegcompression *jpegcomp)
1290 {
1291 struct gspca_dev *gspca_dev = priv;
1292 int ret;
1293
1294 if (!gspca_dev->sd_desc->get_jcomp)
1295 return -EINVAL;
1296 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1297 return -ERESTARTSYS;
1298 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1299 mutex_unlock(&gspca_dev->usb_lock);
1300 return ret;
1301 }
1302
1303 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1304 struct v4l2_jpegcompression *jpegcomp)
1305 {
1306 struct gspca_dev *gspca_dev = priv;
1307 int ret;
1308
1309 if (!gspca_dev->sd_desc->set_jcomp)
1310 return -EINVAL;
1311 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1312 return -ERESTARTSYS;
1313 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1314 mutex_unlock(&gspca_dev->usb_lock);
1315 return ret;
1316 }
1317
1318 static int vidioc_g_parm(struct file *filp, void *priv,
1319 struct v4l2_streamparm *parm)
1320 {
1321 struct gspca_dev *gspca_dev = priv;
1322
1323 memset(parm, 0, sizeof *parm);
1324 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1325 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1326
1327 if (gspca_dev->sd_desc->get_streamparm) {
1328 int ret;
1329
1330 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1331 return -ERESTARTSYS;
1332 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1333 mutex_unlock(&gspca_dev->usb_lock);
1334 return ret;
1335 }
1336
1337 return 0;
1338 }
1339
1340 static int vidioc_s_parm(struct file *filp, void *priv,
1341 struct v4l2_streamparm *parm)
1342 {
1343 struct gspca_dev *gspca_dev = priv;
1344 int n;
1345
1346 n = parm->parm.capture.readbuffers;
1347 if (n == 0 || n > GSPCA_MAX_FRAMES)
1348 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1349 else
1350 gspca_dev->nbufread = n;
1351
1352 if (gspca_dev->sd_desc->set_streamparm) {
1353 int ret;
1354
1355 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1356 return -ERESTARTSYS;
1357 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1358 mutex_unlock(&gspca_dev->usb_lock);
1359 return ret;
1360 }
1361
1362 return 0;
1363 }
1364
1365 static int vidioc_s_std(struct file *filp, void *priv,
1366 v4l2_std_id *parm)
1367 {
1368 return 0;
1369 }
1370
1371 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1372 static int vidiocgmbuf(struct file *file, void *priv,
1373 struct video_mbuf *mbuf)
1374 {
1375 struct gspca_dev *gspca_dev = file->private_data;
1376 int i;
1377
1378 PDEBUG(D_STREAM, "cgmbuf");
1379 if (gspca_dev->nframes == 0) {
1380 int ret;
1381
1382 {
1383 struct v4l2_format fmt;
1384
1385 memset(&fmt, 0, sizeof fmt);
1386 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1387 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1388 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1389 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1390 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1391 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1392 if (ret != 0)
1393 return ret;
1394 }
1395 {
1396 struct v4l2_requestbuffers rb;
1397
1398 memset(&rb, 0, sizeof rb);
1399 rb.count = 4;
1400 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1401 rb.memory = V4L2_MEMORY_MMAP;
1402 ret = vidioc_reqbufs(file, priv, &rb);
1403 if (ret != 0)
1404 return ret;
1405 }
1406 }
1407 mbuf->frames = gspca_dev->nframes;
1408 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1409 for (i = 0; i < mbuf->frames; i++)
1410 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1411 return 0;
1412 }
1413 #endif
1414
1415 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1416 {
1417 struct gspca_dev *gspca_dev = file->private_data;
1418 struct gspca_frame *frame;
1419 struct page *page;
1420 unsigned long addr, start, size;
1421 int i, ret;
1422
1423 start = vma->vm_start;
1424 size = vma->vm_end - vma->vm_start;
1425 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1426
1427 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1428 return -ERESTARTSYS;
1429 if (!gspca_dev->present) {
1430 ret = -ENODEV;
1431 goto out;
1432 }
1433 if (gspca_dev->capt_file != file) {
1434 ret = -EINVAL;
1435 goto out;
1436 }
1437
1438 frame = NULL;
1439 for (i = 0; i < gspca_dev->nframes; ++i) {
1440 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1441 PDEBUG(D_STREAM, "mmap bad memory type");
1442 break;
1443 }
1444 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1445 == vma->vm_pgoff) {
1446 frame = &gspca_dev->frame[i];
1447 break;
1448 }
1449 }
1450 if (frame == NULL) {
1451 PDEBUG(D_STREAM, "mmap no frame buffer found");
1452 ret = -EINVAL;
1453 goto out;
1454 }
1455 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1456 /* v4l1 maps all the buffers */
1457 if (i != 0
1458 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1459 #endif
1460 if (size != frame->v4l2_buf.length) {
1461 PDEBUG(D_STREAM, "mmap bad size");
1462 ret = -EINVAL;
1463 goto out;
1464 }
1465
1466 /*
1467 * - VM_IO marks the area as being a mmaped region for I/O to a
1468 * device. It also prevents the region from being core dumped.
1469 */
1470 vma->vm_flags |= VM_IO;
1471
1472 addr = (unsigned long) frame->data;
1473 while (size > 0) {
1474 page = vmalloc_to_page((void *) addr);
1475 ret = vm_insert_page(vma, start, page);
1476 if (ret < 0)
1477 goto out;
1478 start += PAGE_SIZE;
1479 addr += PAGE_SIZE;
1480 size -= PAGE_SIZE;
1481 }
1482
1483 vma->vm_ops = &gspca_vm_ops;
1484 vma->vm_private_data = frame;
1485 gspca_vm_open(vma);
1486 ret = 0;
1487 out:
1488 mutex_unlock(&gspca_dev->queue_lock);
1489 return ret;
1490 }
1491
1492 /*
1493 * wait for a video frame
1494 *
1495 * If a frame is ready, its index is returned.
1496 */
1497 static int frame_wait(struct gspca_dev *gspca_dev,
1498 int nonblock_ing)
1499 {
1500 struct gspca_frame *frame;
1501 int i, j, ret;
1502
1503 /* check if a frame is ready */
1504 i = gspca_dev->fr_o;
1505 j = gspca_dev->fr_queue[i];
1506 frame = &gspca_dev->frame[j];
1507
1508 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1509 if (nonblock_ing)
1510 return -EAGAIN;
1511
1512 /* wait till a frame is ready */
1513 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1514 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1515 !gspca_dev->streaming || !gspca_dev->present,
1516 msecs_to_jiffies(3000));
1517 if (ret < 0)
1518 return ret;
1519 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1520 return -EIO;
1521 }
1522
1523 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1524 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1525 gspca_dev->fr_q,
1526 gspca_dev->fr_i,
1527 gspca_dev->fr_o);
1528
1529 if (gspca_dev->sd_desc->dq_callback) {
1530 mutex_lock(&gspca_dev->usb_lock);
1531 gspca_dev->sd_desc->dq_callback(gspca_dev);
1532 mutex_unlock(&gspca_dev->usb_lock);
1533 }
1534 return j;
1535 }
1536
1537 /*
1538 * dequeue a video buffer
1539 *
1540 * If nonblock_ing is false, block until a buffer is available.
1541 */
1542 static int vidioc_dqbuf(struct file *file, void *priv,
1543 struct v4l2_buffer *v4l2_buf)
1544 {
1545 struct gspca_dev *gspca_dev = priv;
1546 struct gspca_frame *frame;
1547 int i, ret;
1548
1549 PDEBUG(D_FRAM, "dqbuf");
1550 if (v4l2_buf->memory != gspca_dev->memory)
1551 return -EINVAL;
1552
1553 /* if not streaming, be sure the application will not loop forever */
1554 if (!(file->f_flags & O_NONBLOCK)
1555 && !gspca_dev->streaming && gspca_dev->users == 1)
1556 return -EINVAL;
1557
1558 /* only the capturing file may dequeue */
1559 if (gspca_dev->capt_file != file)
1560 return -EINVAL;
1561
1562 /* only one dequeue / read at a time */
1563 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1564 return -ERESTARTSYS;
1565
1566 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1567 if (ret < 0)
1568 goto out;
1569 i = ret; /* frame index */
1570 frame = &gspca_dev->frame[i];
1571 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1572 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1573 frame->data,
1574 frame->v4l2_buf.bytesused)) {
1575 PDEBUG(D_ERR|D_STREAM,
1576 "dqbuf cp to user failed");
1577 ret = -EFAULT;
1578 goto out;
1579 }
1580 }
1581 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1582 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1583 PDEBUG(D_FRAM, "dqbuf %d", i);
1584 ret = 0;
1585 out:
1586 mutex_unlock(&gspca_dev->read_lock);
1587 return ret;
1588 }
1589
1590 /*
1591 * queue a video buffer
1592 *
1593 * Attempting to queue a buffer that has already been
1594 * queued will return -EINVAL.
1595 */
1596 static int vidioc_qbuf(struct file *file, void *priv,
1597 struct v4l2_buffer *v4l2_buf)
1598 {
1599 struct gspca_dev *gspca_dev = priv;
1600 struct gspca_frame *frame;
1601 int i, index, ret;
1602
1603 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1604
1605 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1606 return -ERESTARTSYS;
1607
1608 index = v4l2_buf->index;
1609 if ((unsigned) index >= gspca_dev->nframes) {
1610 PDEBUG(D_FRAM,
1611 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1612 ret = -EINVAL;
1613 goto out;
1614 }
1615 if (v4l2_buf->memory != gspca_dev->memory) {
1616 PDEBUG(D_FRAM, "qbuf bad memory type");
1617 ret = -EINVAL;
1618 goto out;
1619 }
1620
1621 frame = &gspca_dev->frame[index];
1622 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1623 PDEBUG(D_FRAM, "qbuf bad state");
1624 ret = -EINVAL;
1625 goto out;
1626 }
1627
1628 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1629
1630 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1631 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1632 frame->v4l2_buf.length = v4l2_buf->length;
1633 }
1634
1635 /* put the buffer in the 'queued' queue */
1636 i = gspca_dev->fr_q;
1637 gspca_dev->fr_queue[i] = index;
1638 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1639 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1640 gspca_dev->fr_q,
1641 gspca_dev->fr_i,
1642 gspca_dev->fr_o);
1643
1644 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1645 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1646 ret = 0;
1647 out:
1648 mutex_unlock(&gspca_dev->queue_lock);
1649 return ret;
1650 }
1651
1652 /*
1653 * allocate the resources for read()
1654 */
1655 static int read_alloc(struct gspca_dev *gspca_dev,
1656 struct file *file)
1657 {
1658 struct v4l2_buffer v4l2_buf;
1659 int i, ret;
1660
1661 PDEBUG(D_STREAM, "read alloc");
1662 if (gspca_dev->nframes == 0) {
1663 struct v4l2_requestbuffers rb;
1664
1665 memset(&rb, 0, sizeof rb);
1666 rb.count = gspca_dev->nbufread;
1667 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1668 rb.memory = GSPCA_MEMORY_READ;
1669 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1670 if (ret != 0) {
1671 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1672 return ret;
1673 }
1674 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1675 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1676 v4l2_buf.memory = GSPCA_MEMORY_READ;
1677 for (i = 0; i < gspca_dev->nbufread; i++) {
1678 v4l2_buf.index = i;
1679 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1680 if (ret != 0) {
1681 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1682 return ret;
1683 }
1684 }
1685 gspca_dev->memory = GSPCA_MEMORY_READ;
1686 }
1687
1688 /* start streaming */
1689 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1690 if (ret != 0)
1691 PDEBUG(D_STREAM, "read streamon err %d", ret);
1692 return ret;
1693 }
1694
1695 static unsigned int dev_poll(struct file *file, poll_table *wait)
1696 {
1697 struct gspca_dev *gspca_dev = file->private_data;
1698 int i, ret;
1699
1700 PDEBUG(D_FRAM, "poll");
1701
1702 poll_wait(file, &gspca_dev->wq, wait);
1703 if (!gspca_dev->present)
1704 return POLLERR;
1705
1706 /* if reqbufs is not done, the user would use read() */
1707 if (gspca_dev->nframes == 0) {
1708 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1709 return POLLERR; /* not the 1st time */
1710 ret = read_alloc(gspca_dev, file);
1711 if (ret != 0)
1712 return POLLERR;
1713 }
1714
1715 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1716 return POLLERR;
1717 if (!gspca_dev->present) {
1718 ret = POLLERR;
1719 goto out;
1720 }
1721
1722 /* check the next incoming buffer */
1723 i = gspca_dev->fr_o;
1724 i = gspca_dev->fr_queue[i];
1725 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1726 ret = POLLIN | POLLRDNORM; /* something to read */
1727 else
1728 ret = 0;
1729 out:
1730 mutex_unlock(&gspca_dev->queue_lock);
1731 return ret;
1732 }
1733
1734 static ssize_t dev_read(struct file *file, char __user *data,
1735 size_t count, loff_t *ppos)
1736 {
1737 struct gspca_dev *gspca_dev = file->private_data;
1738 struct gspca_frame *frame;
1739 struct v4l2_buffer v4l2_buf;
1740 struct timeval timestamp;
1741 int n, ret, ret2;
1742
1743 PDEBUG(D_FRAM, "read (%zd)", count);
1744 if (!gspca_dev->present)
1745 return -ENODEV;
1746 switch (gspca_dev->memory) {
1747 case GSPCA_MEMORY_NO: /* first time */
1748 ret = read_alloc(gspca_dev, file);
1749 if (ret != 0)
1750 return ret;
1751 break;
1752 case GSPCA_MEMORY_READ:
1753 if (gspca_dev->capt_file == file)
1754 break;
1755 /* fall thru */
1756 default:
1757 return -EINVAL;
1758 }
1759
1760 /* get a frame */
1761 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1762 timestamp.tv_sec--;
1763 n = 2;
1764 for (;;) {
1765 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1766 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1767 v4l2_buf.memory = GSPCA_MEMORY_READ;
1768 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1769 if (ret != 0) {
1770 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1771 return ret;
1772 }
1773
1774 /* if the process slept for more than 1 second,
1775 * get a newer frame */
1776 frame = &gspca_dev->frame[v4l2_buf.index];
1777 if (--n < 0)
1778 break; /* avoid infinite loop */
1779 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1780 break;
1781 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1782 if (ret != 0) {
1783 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1784 return ret;
1785 }
1786 }
1787
1788 /* copy the frame */
1789 if (count > frame->v4l2_buf.bytesused)
1790 count = frame->v4l2_buf.bytesused;
1791 ret = copy_to_user(data, frame->data, count);
1792 if (ret != 0) {
1793 PDEBUG(D_ERR|D_STREAM,
1794 "read cp to user lack %d / %zd", ret, count);
1795 ret = -EFAULT;
1796 goto out;
1797 }
1798 ret = count;
1799 out:
1800 /* in each case, requeue the buffer */
1801 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1802 if (ret2 != 0)
1803 return ret2;
1804 return ret;
1805 }
1806
1807 static struct v4l2_file_operations dev_fops = {
1808 .owner = THIS_MODULE,
1809 .open = dev_open,
1810 .release = dev_close,
1811 .read = dev_read,
1812 .mmap = dev_mmap,
1813 .unlocked_ioctl = video_ioctl2,
1814 .poll = dev_poll,
1815 };
1816
1817 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1818 .vidioc_querycap = vidioc_querycap,
1819 .vidioc_dqbuf = vidioc_dqbuf,
1820 .vidioc_qbuf = vidioc_qbuf,
1821 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1822 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1823 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1824 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1825 .vidioc_streamon = vidioc_streamon,
1826 .vidioc_queryctrl = vidioc_queryctrl,
1827 .vidioc_g_ctrl = vidioc_g_ctrl,
1828 .vidioc_s_ctrl = vidioc_s_ctrl,
1829 .vidioc_g_audio = vidioc_g_audio,
1830 .vidioc_s_audio = vidioc_s_audio,
1831 .vidioc_enumaudio = vidioc_enumaudio,
1832 .vidioc_querymenu = vidioc_querymenu,
1833 .vidioc_enum_input = vidioc_enum_input,
1834 .vidioc_g_input = vidioc_g_input,
1835 .vidioc_s_input = vidioc_s_input,
1836 .vidioc_reqbufs = vidioc_reqbufs,
1837 .vidioc_querybuf = vidioc_querybuf,
1838 .vidioc_streamoff = vidioc_streamoff,
1839 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1840 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1841 .vidioc_g_parm = vidioc_g_parm,
1842 .vidioc_s_parm = vidioc_s_parm,
1843 .vidioc_s_std = vidioc_s_std,
1844 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1845 .vidiocgmbuf = vidiocgmbuf,
1846 #endif
1847 };
1848
1849 static struct video_device gspca_template = {
1850 .name = "gspca main driver",
1851 .fops = &dev_fops,
1852 .ioctl_ops = &dev_ioctl_ops,
1853 .release = gspca_release,
1854 .minor = -1,
1855 };
1856
1857 /*
1858 * probe and create a new gspca device
1859 *
1860 * This function must be called by the sub-driver when it is
1861 * called for probing a new device.
1862 */
1863 int gspca_dev_probe(struct usb_interface *intf,
1864 const struct usb_device_id *id,
1865 const struct sd_desc *sd_desc,
1866 int dev_size,
1867 struct module *module)
1868 {
1869 struct usb_interface_descriptor *interface;
1870 struct gspca_dev *gspca_dev;
1871 struct usb_device *dev = interface_to_usbdev(intf);
1872 int ret;
1873
1874 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1875
1876 /* we don't handle multi-config cameras */
1877 if (dev->descriptor.bNumConfigurations != 1)
1878 return -ENODEV;
1879 interface = &intf->cur_altsetting->desc;
1880 if (interface->bInterfaceNumber > 0)
1881 return -ENODEV;
1882
1883 /* create the device */
1884 if (dev_size < sizeof *gspca_dev)
1885 dev_size = sizeof *gspca_dev;
1886 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1887 if (!gspca_dev) {
1888 err("couldn't kzalloc gspca struct");
1889 return -ENOMEM;
1890 }
1891 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1892 if (!gspca_dev->usb_buf) {
1893 err("out of memory");
1894 ret = -ENOMEM;
1895 goto out;
1896 }
1897 gspca_dev->dev = dev;
1898 gspca_dev->iface = interface->bInterfaceNumber;
1899 gspca_dev->nbalt = intf->num_altsetting;
1900 gspca_dev->sd_desc = sd_desc;
1901 gspca_dev->nbufread = 2;
1902 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1903
1904 /* configure the subdriver and initialize the USB device */
1905 ret = sd_desc->config(gspca_dev, id);
1906 if (ret < 0)
1907 goto out;
1908 ret = sd_desc->init(gspca_dev);
1909 if (ret < 0)
1910 goto out;
1911 ret = gspca_set_alt0(gspca_dev);
1912 if (ret < 0)
1913 goto out;
1914 gspca_set_default_mode(gspca_dev);
1915
1916 mutex_init(&gspca_dev->usb_lock);
1917 mutex_init(&gspca_dev->read_lock);
1918 mutex_init(&gspca_dev->queue_lock);
1919 init_waitqueue_head(&gspca_dev->wq);
1920
1921 /* init video stuff */
1922 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1923 gspca_dev->vdev.parent = &dev->dev;
1924 gspca_dev->module = module;
1925 gspca_dev->present = 1;
1926 ret = video_register_device(&gspca_dev->vdev,
1927 VFL_TYPE_GRABBER,
1928 video_nr);
1929 if (ret < 0) {
1930 err("video_register_device err %d", ret);
1931 goto out;
1932 }
1933
1934 usb_set_intfdata(intf, gspca_dev);
1935 PDEBUG(D_PROBE, "probe ok");
1936 return 0;
1937 out:
1938 kfree(gspca_dev->usb_buf);
1939 kfree(gspca_dev);
1940 return ret;
1941 }
1942 EXPORT_SYMBOL(gspca_dev_probe);
1943
1944 /*
1945 * USB disconnection
1946 *
1947 * This function must be called by the sub-driver
1948 * when the device disconnects, after the specific resources are freed.
1949 */
1950 void gspca_disconnect(struct usb_interface *intf)
1951 {
1952 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1953
1954 mutex_lock(&gspca_dev->usb_lock);
1955 gspca_dev->present = 0;
1956 mutex_unlock(&gspca_dev->usb_lock);
1957
1958 destroy_urbs(gspca_dev);
1959 gspca_dev->dev = NULL;
1960 usb_set_intfdata(intf, NULL);
1961
1962 /* release the device */
1963 /* (this will call gspca_release() immediatly or on last close) */
1964 video_unregister_device(&gspca_dev->vdev);
1965
1966 PDEBUG(D_PROBE, "disconnect complete");
1967 }
1968 EXPORT_SYMBOL(gspca_disconnect);
1969
1970 #ifdef CONFIG_PM
1971 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1972 {
1973 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1974
1975 if (!gspca_dev->streaming)
1976 return 0;
1977 gspca_dev->frozen = 1; /* avoid urb error messages */
1978 if (gspca_dev->sd_desc->stopN)
1979 gspca_dev->sd_desc->stopN(gspca_dev);
1980 destroy_urbs(gspca_dev);
1981 gspca_set_alt0(gspca_dev);
1982 if (gspca_dev->sd_desc->stop0)
1983 gspca_dev->sd_desc->stop0(gspca_dev);
1984 return 0;
1985 }
1986 EXPORT_SYMBOL(gspca_suspend);
1987
1988 int gspca_resume(struct usb_interface *intf)
1989 {
1990 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1991
1992 gspca_dev->frozen = 0;
1993 gspca_dev->sd_desc->init(gspca_dev);
1994 if (gspca_dev->streaming)
1995 return gspca_init_transfer(gspca_dev);
1996 return 0;
1997 }
1998 EXPORT_SYMBOL(gspca_resume);
1999 #endif
2000 /* -- cam driver utility functions -- */
2001
2002 /* auto gain and exposure algorithm based on the knee algorithm described here:
2003 http://ytse.tricolour.net/docs/LowLightOptimization.html
2004
2005 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2006 where changed. */
2007 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2008 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2009 {
2010 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2011 const struct ctrl *gain_ctrl = NULL;
2012 const struct ctrl *exposure_ctrl = NULL;
2013 const struct ctrl *autogain_ctrl = NULL;
2014 int retval = 0;
2015
2016 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2017 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2018 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2019 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2020 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2021 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2022 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2023 }
2024 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2025 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2026 "on cam without (auto)gain/exposure");
2027 return 0;
2028 }
2029
2030 if (gain_ctrl->get(gspca_dev, &gain) ||
2031 exposure_ctrl->get(gspca_dev, &exposure) ||
2032 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2033 return 0;
2034
2035 orig_gain = gain;
2036 orig_exposure = exposure;
2037
2038 /* If we are of a multiple of deadzone, do multiple steps to reach the
2039 desired lumination fast (with the risc of a slight overshoot) */
2040 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2041
2042 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2043 avg_lum, desired_avg_lum, steps);
2044
2045 for (i = 0; i < steps; i++) {
2046 if (avg_lum > desired_avg_lum) {
2047 if (gain > gain_knee)
2048 gain--;
2049 else if (exposure > exposure_knee)
2050 exposure--;
2051 else if (gain > gain_ctrl->qctrl.default_value)
2052 gain--;
2053 else if (exposure > exposure_ctrl->qctrl.minimum)
2054 exposure--;
2055 else if (gain > gain_ctrl->qctrl.minimum)
2056 gain--;
2057 else
2058 break;
2059 } else {
2060 if (gain < gain_ctrl->qctrl.default_value)
2061 gain++;
2062 else if (exposure < exposure_knee)
2063 exposure++;
2064 else if (gain < gain_knee)
2065 gain++;
2066 else if (exposure < exposure_ctrl->qctrl.maximum)
2067 exposure++;
2068 else if (gain < gain_ctrl->qctrl.maximum)
2069 gain++;
2070 else
2071 break;
2072 }
2073 }
2074
2075 if (gain != orig_gain) {
2076 gain_ctrl->set(gspca_dev, gain);
2077 retval = 1;
2078 }
2079 if (exposure != orig_exposure) {
2080 exposure_ctrl->set(gspca_dev, exposure);
2081 retval = 1;
2082 }
2083
2084 return retval;
2085 }
2086 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2087
2088 /* -- module insert / remove -- */
2089 static int __init gspca_init(void)
2090 {
2091 info("main v%d.%d.%d registered",
2092 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2093 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2094 DRIVER_VERSION_NUMBER & 0xff);
2095 return 0;
2096 }
2097 static void __exit gspca_exit(void)
2098 {
2099 info("main deregistered");
2100 }
2101
2102 module_init(gspca_init);
2103 module_exit(gspca_exit);
2104
2105 #ifdef GSPCA_DEBUG
2106 module_param_named(debug, gspca_debug, int, 0644);
2107 MODULE_PARM_DESC(debug,
2108 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2109 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2110 " 0x0100: v4l2");
2111 #endif
Linux kernel - Deliverables
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