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Merge branches 'release', 'bugzilla-11880', 'bugzilla-12037' and 'bugzilla-12257...
[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 <linux/kref.h>
34 #include <asm/page.h>
35 #include <linux/uaccess.h>
36 #include <linux/jiffies.h>
37 #include <media/v4l2-ioctl.h>
38
39 #include "gspca.h"
40
41 /* global values */
42 #define DEF_NURBS 2 /* default number of URBs */
43
44 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
45 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
46 MODULE_LICENSE("GPL");
47
48 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 3, 0)
49
50 static int video_nr = -1;
51
52 #ifdef GSPCA_DEBUG
53 int gspca_debug = D_ERR | D_PROBE;
54 EXPORT_SYMBOL(gspca_debug);
55
56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 {
58 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60 txt,
61 pixfmt & 0xff,
62 (pixfmt >> 8) & 0xff,
63 (pixfmt >> 16) & 0xff,
64 pixfmt >> 24,
65 w, h);
66 } else {
67 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68 txt,
69 pixfmt,
70 w, h);
71 }
72 }
73 #else
74 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 #endif
76
77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
78 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
79 #define GSPCA_MEMORY_READ 7
80
81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
82
83 /*
84 * VMA operations.
85 */
86 static void gspca_vm_open(struct vm_area_struct *vma)
87 {
88 struct gspca_frame *frame = vma->vm_private_data;
89
90 frame->vma_use_count++;
91 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 }
93
94 static void gspca_vm_close(struct vm_area_struct *vma)
95 {
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 if (--frame->vma_use_count <= 0)
99 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static struct vm_operations_struct gspca_vm_ops = {
103 .open = gspca_vm_open,
104 .close = gspca_vm_close,
105 };
106
107 /* get the current input frame buffer */
108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 {
110 struct gspca_frame *frame;
111 int i;
112
113 i = gspca_dev->fr_i;
114 i = gspca_dev->fr_queue[i];
115 frame = &gspca_dev->frame[i];
116 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117 != V4L2_BUF_FLAG_QUEUED)
118 return NULL;
119 return frame;
120 }
121 EXPORT_SYMBOL(gspca_get_i_frame);
122
123 /*
124 * fill a video frame from an URB and resubmit
125 */
126 static void fill_frame(struct gspca_dev *gspca_dev,
127 struct urb *urb)
128 {
129 struct gspca_frame *frame;
130 __u8 *data; /* address of data in the iso message */
131 int i, len, st;
132 cam_pkt_op pkt_scan;
133
134 if (urb->status != 0) {
135 #ifdef CONFIG_PM
136 if (!gspca_dev->frozen)
137 #endif
138 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
139 return; /* disconnection ? */
140 }
141 pkt_scan = gspca_dev->sd_desc->pkt_scan;
142 for (i = 0; i < urb->number_of_packets; i++) {
143
144 /* check the availability of the frame buffer */
145 frame = gspca_get_i_frame(gspca_dev);
146 if (!frame) {
147 gspca_dev->last_packet_type = DISCARD_PACKET;
148 break;
149 }
150
151 /* check the packet status and length */
152 len = urb->iso_frame_desc[i].actual_length;
153 if (len == 0)
154 continue;
155 st = urb->iso_frame_desc[i].status;
156 if (st) {
157 PDEBUG(D_ERR,
158 "ISOC data error: [%d] len=%d, status=%d",
159 i, len, st);
160 gspca_dev->last_packet_type = DISCARD_PACKET;
161 continue;
162 }
163
164 /* let the packet be analyzed by the subdriver */
165 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
166 i, urb->iso_frame_desc[i].offset, len);
167 data = (__u8 *) urb->transfer_buffer
168 + urb->iso_frame_desc[i].offset;
169 pkt_scan(gspca_dev, frame, data, len);
170 }
171
172 /* resubmit the URB */
173 urb->status = 0;
174 st = usb_submit_urb(urb, GFP_ATOMIC);
175 if (st < 0)
176 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
177 }
178
179 /*
180 * ISOC message interrupt from the USB device
181 *
182 * Analyse each packet and call the subdriver for copy to the frame buffer.
183 */
184 static void isoc_irq(struct urb *urb
185 )
186 {
187 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
188
189 PDEBUG(D_PACK, "isoc irq");
190 if (!gspca_dev->streaming)
191 return;
192 fill_frame(gspca_dev, urb);
193 }
194
195 /*
196 * bulk message interrupt from the USB device
197 */
198 static void bulk_irq(struct urb *urb
199 )
200 {
201 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
202 struct gspca_frame *frame;
203
204 PDEBUG(D_PACK, "bulk irq");
205 if (!gspca_dev->streaming)
206 return;
207 if (urb->status != 0 && urb->status != -ECONNRESET) {
208 #ifdef CONFIG_PM
209 if (!gspca_dev->frozen)
210 #endif
211 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
212 return; /* disconnection ? */
213 }
214
215 /* check the availability of the frame buffer */
216 frame = gspca_get_i_frame(gspca_dev);
217 if (!frame) {
218 gspca_dev->last_packet_type = DISCARD_PACKET;
219 } else {
220 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
221 gspca_dev->sd_desc->pkt_scan(gspca_dev,
222 frame,
223 urb->transfer_buffer,
224 urb->actual_length);
225 }
226 }
227
228 /*
229 * add data to the current frame
230 *
231 * This function is called by the subdrivers at interrupt level.
232 *
233 * To build a frame, these ones must add
234 * - one FIRST_PACKET
235 * - 0 or many INTER_PACKETs
236 * - one LAST_PACKET
237 * DISCARD_PACKET invalidates the whole frame.
238 * On LAST_PACKET, a new frame is returned.
239 */
240 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
241 enum gspca_packet_type packet_type,
242 struct gspca_frame *frame,
243 const __u8 *data,
244 int len)
245 {
246 int i, j;
247
248 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
249
250 /* when start of a new frame, if the current frame buffer
251 * is not queued, discard the whole frame */
252 if (packet_type == FIRST_PACKET) {
253 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
254 != V4L2_BUF_FLAG_QUEUED) {
255 gspca_dev->last_packet_type = DISCARD_PACKET;
256 return frame;
257 }
258 frame->data_end = frame->data;
259 jiffies_to_timeval(get_jiffies_64(),
260 &frame->v4l2_buf.timestamp);
261 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
262 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
263 if (packet_type == LAST_PACKET)
264 gspca_dev->last_packet_type = packet_type;
265 return frame;
266 }
267
268 /* append the packet to the frame buffer */
269 if (len > 0) {
270 if (frame->data_end - frame->data + len
271 > frame->v4l2_buf.length) {
272 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
273 frame->data_end - frame->data + len,
274 frame->v4l2_buf.length);
275 packet_type = DISCARD_PACKET;
276 } else {
277 memcpy(frame->data_end, data, len);
278 frame->data_end += len;
279 }
280 }
281 gspca_dev->last_packet_type = packet_type;
282
283 /* if last packet, wake up the application and advance in the queue */
284 if (packet_type == LAST_PACKET) {
285 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
286 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
287 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
288 atomic_inc(&gspca_dev->nevent);
289 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
290 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
291 gspca_dev->fr_i = i;
292 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
293 frame->v4l2_buf.bytesused,
294 gspca_dev->fr_q,
295 i,
296 gspca_dev->fr_o);
297 j = gspca_dev->fr_queue[i];
298 frame = &gspca_dev->frame[j];
299 }
300 return frame;
301 }
302 EXPORT_SYMBOL(gspca_frame_add);
303
304 static int gspca_is_compressed(__u32 format)
305 {
306 switch (format) {
307 case V4L2_PIX_FMT_MJPEG:
308 case V4L2_PIX_FMT_JPEG:
309 case V4L2_PIX_FMT_SPCA561:
310 case V4L2_PIX_FMT_PAC207:
311 return 1;
312 }
313 return 0;
314 }
315
316 static void *rvmalloc(unsigned long size)
317 {
318 void *mem;
319 unsigned long adr;
320
321 mem = vmalloc_32(size);
322 if (mem != NULL) {
323 adr = (unsigned long) mem;
324 while ((long) size > 0) {
325 SetPageReserved(vmalloc_to_page((void *) adr));
326 adr += PAGE_SIZE;
327 size -= PAGE_SIZE;
328 }
329 }
330 return mem;
331 }
332
333 static void rvfree(void *mem, long size)
334 {
335 unsigned long adr;
336
337 adr = (unsigned long) mem;
338 while (size > 0) {
339 ClearPageReserved(vmalloc_to_page((void *) adr));
340 adr += PAGE_SIZE;
341 size -= PAGE_SIZE;
342 }
343 vfree(mem);
344 }
345
346 static int frame_alloc(struct gspca_dev *gspca_dev,
347 unsigned int count)
348 {
349 struct gspca_frame *frame;
350 unsigned int frsz;
351 int i;
352
353 i = gspca_dev->curr_mode;
354 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
355 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
356 frsz = PAGE_ALIGN(frsz);
357 gspca_dev->frsz = frsz;
358 if (count > GSPCA_MAX_FRAMES)
359 count = GSPCA_MAX_FRAMES;
360 gspca_dev->frbuf = rvmalloc(frsz * count);
361 if (!gspca_dev->frbuf) {
362 err("frame alloc failed");
363 return -ENOMEM;
364 }
365 gspca_dev->nframes = count;
366 for (i = 0; i < count; i++) {
367 frame = &gspca_dev->frame[i];
368 frame->v4l2_buf.index = i;
369 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
370 frame->v4l2_buf.flags = 0;
371 frame->v4l2_buf.field = V4L2_FIELD_NONE;
372 frame->v4l2_buf.length = frsz;
373 frame->v4l2_buf.memory = gspca_dev->memory;
374 frame->v4l2_buf.sequence = 0;
375 frame->data = frame->data_end =
376 gspca_dev->frbuf + i * frsz;
377 frame->v4l2_buf.m.offset = i * frsz;
378 }
379 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
380 gspca_dev->last_packet_type = DISCARD_PACKET;
381 gspca_dev->sequence = 0;
382 atomic_set(&gspca_dev->nevent, 0);
383 return 0;
384 }
385
386 static void frame_free(struct gspca_dev *gspca_dev)
387 {
388 int i;
389
390 PDEBUG(D_STREAM, "frame free");
391 if (gspca_dev->frbuf != NULL) {
392 rvfree(gspca_dev->frbuf,
393 gspca_dev->nframes * gspca_dev->frsz);
394 gspca_dev->frbuf = NULL;
395 for (i = 0; i < gspca_dev->nframes; i++)
396 gspca_dev->frame[i].data = NULL;
397 }
398 gspca_dev->nframes = 0;
399 }
400
401 static void destroy_urbs(struct gspca_dev *gspca_dev)
402 {
403 struct urb *urb;
404 unsigned int i;
405
406 PDEBUG(D_STREAM, "kill transfer");
407 for (i = 0; i < MAX_NURBS; i++) {
408 urb = gspca_dev->urb[i];
409 if (urb == NULL)
410 break;
411
412 gspca_dev->urb[i] = NULL;
413 usb_kill_urb(urb);
414 if (urb->transfer_buffer != NULL)
415 usb_buffer_free(gspca_dev->dev,
416 urb->transfer_buffer_length,
417 urb->transfer_buffer,
418 urb->transfer_dma);
419 usb_free_urb(urb);
420 }
421 }
422
423 /*
424 * look for an input transfer endpoint in an alternate setting
425 */
426 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
427 __u8 epaddr,
428 __u8 xfer)
429 {
430 struct usb_host_endpoint *ep;
431 int i, attr;
432
433 epaddr |= USB_DIR_IN;
434 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
435 ep = &alt->endpoint[i];
436 if (ep->desc.bEndpointAddress == epaddr) {
437 attr = ep->desc.bmAttributes
438 & USB_ENDPOINT_XFERTYPE_MASK;
439 if (attr == xfer)
440 return ep;
441 break;
442 }
443 }
444 return NULL;
445 }
446
447 /*
448 * look for an input (isoc or bulk) endpoint
449 *
450 * The endpoint is defined by the subdriver.
451 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
452 * This routine may be called many times when the bandwidth is too small
453 * (the bandwidth is checked on urb submit).
454 */
455 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
456 {
457 struct usb_interface *intf;
458 struct usb_host_endpoint *ep;
459 int i, ret;
460
461 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
462 ep = NULL;
463 i = gspca_dev->alt; /* previous alt setting */
464
465 /* try isoc */
466 while (--i > 0) { /* alt 0 is unusable */
467 ep = alt_xfer(&intf->altsetting[i],
468 gspca_dev->cam.epaddr,
469 USB_ENDPOINT_XFER_ISOC);
470 if (ep)
471 break;
472 }
473
474 /* if no isoc, try bulk */
475 if (ep == NULL) {
476 ep = alt_xfer(&intf->altsetting[0],
477 gspca_dev->cam.epaddr,
478 USB_ENDPOINT_XFER_BULK);
479 if (ep == NULL) {
480 err("no transfer endpoint found");
481 return NULL;
482 }
483 }
484 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
485 i, ep->desc.bEndpointAddress);
486 if (i > 0) {
487 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
488 if (ret < 0) {
489 err("set interface err %d", ret);
490 return NULL;
491 }
492 }
493 gspca_dev->alt = i; /* memorize the current alt setting */
494 return ep;
495 }
496
497 /*
498 * create the URBs for image transfer
499 */
500 static int create_urbs(struct gspca_dev *gspca_dev,
501 struct usb_host_endpoint *ep)
502 {
503 struct urb *urb;
504 int n, nurbs, i, psize, npkt, bsize;
505
506 /* calculate the packet size and the number of packets */
507 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
508
509 if (gspca_dev->alt != 0) { /* isoc */
510
511 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
512 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
513 npkt = ISO_MAX_SIZE / psize;
514 if (npkt > ISO_MAX_PKT)
515 npkt = ISO_MAX_PKT;
516 bsize = psize * npkt;
517 PDEBUG(D_STREAM,
518 "isoc %d pkts size %d = bsize:%d",
519 npkt, psize, bsize);
520 nurbs = DEF_NURBS;
521 } else { /* bulk */
522 npkt = 0;
523 bsize = gspca_dev->cam. bulk_size;
524 if (bsize == 0)
525 bsize = psize;
526 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
527 nurbs = 1;
528 }
529
530 gspca_dev->nurbs = nurbs;
531 for (n = 0; n < nurbs; n++) {
532 urb = usb_alloc_urb(npkt, GFP_KERNEL);
533 if (!urb) {
534 err("usb_alloc_urb failed");
535 destroy_urbs(gspca_dev);
536 return -ENOMEM;
537 }
538 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
539 bsize,
540 GFP_KERNEL,
541 &urb->transfer_dma);
542
543 if (urb->transfer_buffer == NULL) {
544 usb_free_urb(urb);
545 err("usb_buffer_urb failed");
546 destroy_urbs(gspca_dev);
547 return -ENOMEM;
548 }
549 gspca_dev->urb[n] = urb;
550 urb->dev = gspca_dev->dev;
551 urb->context = gspca_dev;
552 urb->transfer_buffer_length = bsize;
553 if (npkt != 0) { /* ISOC */
554 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
555 ep->desc.bEndpointAddress);
556 urb->transfer_flags = URB_ISO_ASAP
557 | URB_NO_TRANSFER_DMA_MAP;
558 urb->interval = ep->desc.bInterval;
559 urb->complete = isoc_irq;
560 urb->number_of_packets = npkt;
561 for (i = 0; i < npkt; i++) {
562 urb->iso_frame_desc[i].length = psize;
563 urb->iso_frame_desc[i].offset = psize * i;
564 }
565 } else { /* bulk */
566 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
567 ep->desc.bEndpointAddress),
568 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
569 urb->complete = bulk_irq;
570 }
571 }
572 return 0;
573 }
574
575 /*
576 * start the USB transfer
577 */
578 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
579 {
580 struct usb_host_endpoint *ep;
581 int n, ret;
582
583 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
584 return -ERESTARTSYS;
585
586 /* set the higher alternate setting and
587 * loop until urb submit succeeds */
588 gspca_dev->alt = gspca_dev->nbalt;
589 for (;;) {
590 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
591 ep = get_ep(gspca_dev);
592 if (ep == NULL) {
593 ret = -EIO;
594 goto out;
595 }
596 ret = create_urbs(gspca_dev, ep);
597 if (ret < 0)
598 goto out;
599
600 /* start the cam */
601 ret = gspca_dev->sd_desc->start(gspca_dev);
602 if (ret < 0) {
603 destroy_urbs(gspca_dev);
604 goto out;
605 }
606 gspca_dev->streaming = 1;
607 atomic_set(&gspca_dev->nevent, 0);
608
609 /* bulk transfers are started by the subdriver */
610 if (gspca_dev->alt == 0)
611 break;
612
613 /* submit the URBs */
614 for (n = 0; n < gspca_dev->nurbs; n++) {
615 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
616 if (ret < 0) {
617 PDEBUG(D_ERR|D_STREAM,
618 "usb_submit_urb [%d] err %d", n, ret);
619 gspca_dev->streaming = 0;
620 destroy_urbs(gspca_dev);
621 if (ret == -ENOSPC)
622 break; /* try the previous alt */
623 goto out;
624 }
625 }
626 if (ret >= 0)
627 break;
628 }
629 out:
630 mutex_unlock(&gspca_dev->usb_lock);
631 return ret;
632 }
633
634 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
635 {
636 int ret;
637
638 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
639 if (ret < 0)
640 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
641 return ret;
642 }
643
644 /* Note: both the queue and the usb locks should be held when calling this */
645 static void gspca_stream_off(struct gspca_dev *gspca_dev)
646 {
647 gspca_dev->streaming = 0;
648 atomic_set(&gspca_dev->nevent, 0);
649 if (gspca_dev->present
650 && gspca_dev->sd_desc->stopN)
651 gspca_dev->sd_desc->stopN(gspca_dev);
652 destroy_urbs(gspca_dev);
653 gspca_set_alt0(gspca_dev);
654 if (gspca_dev->sd_desc->stop0)
655 gspca_dev->sd_desc->stop0(gspca_dev);
656 PDEBUG(D_STREAM, "stream off OK");
657 }
658
659 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
660 {
661 int i;
662
663 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
664 gspca_dev->curr_mode = i;
665 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
666 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
667 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
668 }
669
670 static int wxh_to_mode(struct gspca_dev *gspca_dev,
671 int width, int height)
672 {
673 int i;
674
675 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
676 if (width >= gspca_dev->cam.cam_mode[i].width
677 && height >= gspca_dev->cam.cam_mode[i].height)
678 break;
679 }
680 return i;
681 }
682
683 /*
684 * search a mode with the right pixel format
685 */
686 static int gspca_get_mode(struct gspca_dev *gspca_dev,
687 int mode,
688 int pixfmt)
689 {
690 int modeU, modeD;
691
692 modeU = modeD = mode;
693 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
694 if (--modeD >= 0) {
695 if (gspca_dev->cam.cam_mode[modeD].pixelformat
696 == pixfmt)
697 return modeD;
698 }
699 if (++modeU < gspca_dev->cam.nmodes) {
700 if (gspca_dev->cam.cam_mode[modeU].pixelformat
701 == pixfmt)
702 return modeU;
703 }
704 }
705 return -EINVAL;
706 }
707
708 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
709 struct v4l2_fmtdesc *fmtdesc)
710 {
711 struct gspca_dev *gspca_dev = priv;
712 int i, j, index;
713 __u32 fmt_tb[8];
714
715 /* give an index to each format */
716 index = 0;
717 j = 0;
718 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
719 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
720 j = 0;
721 for (;;) {
722 if (fmt_tb[j] == fmt_tb[index])
723 break;
724 j++;
725 }
726 if (j == index) {
727 if (fmtdesc->index == index)
728 break; /* new format */
729 index++;
730 if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
731 return -EINVAL;
732 }
733 }
734 if (i < 0)
735 return -EINVAL; /* no more format */
736
737 fmtdesc->pixelformat = fmt_tb[index];
738 if (gspca_is_compressed(fmt_tb[index]))
739 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
740 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
741 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
742 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
743 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
744 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
745 fmtdesc->description[4] = '\0';
746 return 0;
747 }
748
749 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
750 struct v4l2_format *fmt)
751 {
752 struct gspca_dev *gspca_dev = priv;
753 int mode;
754
755 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
756 return -EINVAL;
757 mode = gspca_dev->curr_mode;
758 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
759 sizeof fmt->fmt.pix);
760 return 0;
761 }
762
763 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
764 struct v4l2_format *fmt)
765 {
766 int w, h, mode, mode2;
767
768 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
769 return -EINVAL;
770 w = fmt->fmt.pix.width;
771 h = fmt->fmt.pix.height;
772
773 #ifdef GSPCA_DEBUG
774 if (gspca_debug & D_CONF)
775 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
776 #endif
777 /* search the closest mode for width and height */
778 mode = wxh_to_mode(gspca_dev, w, h);
779
780 /* OK if right palette */
781 if (gspca_dev->cam.cam_mode[mode].pixelformat
782 != fmt->fmt.pix.pixelformat) {
783
784 /* else, search the closest mode with the same pixel format */
785 mode2 = gspca_get_mode(gspca_dev, mode,
786 fmt->fmt.pix.pixelformat);
787 if (mode2 >= 0)
788 mode = mode2;
789 /* else
790 ; * no chance, return this mode */
791 }
792 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
793 sizeof fmt->fmt.pix);
794 return mode; /* used when s_fmt */
795 }
796
797 static int vidioc_try_fmt_vid_cap(struct file *file,
798 void *priv,
799 struct v4l2_format *fmt)
800 {
801 struct gspca_dev *gspca_dev = priv;
802 int ret;
803
804 ret = try_fmt_vid_cap(gspca_dev, fmt);
805 if (ret < 0)
806 return ret;
807 return 0;
808 }
809
810 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
811 struct v4l2_format *fmt)
812 {
813 struct gspca_dev *gspca_dev = priv;
814 int ret;
815
816 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
817 return -ERESTARTSYS;
818
819 ret = try_fmt_vid_cap(gspca_dev, fmt);
820 if (ret < 0)
821 goto out;
822
823 if (gspca_dev->nframes != 0
824 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
825 ret = -EINVAL;
826 goto out;
827 }
828
829 if (ret == gspca_dev->curr_mode) {
830 ret = 0;
831 goto out; /* same mode */
832 }
833
834 if (gspca_dev->streaming) {
835 ret = -EBUSY;
836 goto out;
837 }
838 gspca_dev->width = fmt->fmt.pix.width;
839 gspca_dev->height = fmt->fmt.pix.height;
840 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
841 gspca_dev->curr_mode = ret;
842
843 ret = 0;
844 out:
845 mutex_unlock(&gspca_dev->queue_lock);
846 return ret;
847 }
848
849 static void gspca_delete(struct kref *kref)
850 {
851 struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
852
853 PDEBUG(D_STREAM, "device deleted");
854
855 kfree(gspca_dev->usb_buf);
856 kfree(gspca_dev);
857 }
858
859 static int dev_open(struct inode *inode, struct file *file)
860 {
861 struct gspca_dev *gspca_dev;
862 int ret;
863
864 PDEBUG(D_STREAM, "%s open", current->comm);
865 gspca_dev = video_drvdata(file);
866 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
867 return -ERESTARTSYS;
868 if (!gspca_dev->present) {
869 ret = -ENODEV;
870 goto out;
871 }
872
873 if (gspca_dev->users > 4) { /* (arbitrary value) */
874 ret = -EBUSY;
875 goto out;
876 }
877
878 /* protect the subdriver against rmmod */
879 if (!try_module_get(gspca_dev->module)) {
880 ret = -ENODEV;
881 goto out;
882 }
883
884 gspca_dev->users++;
885
886 /* one more user */
887 kref_get(&gspca_dev->kref);
888
889 file->private_data = gspca_dev;
890 #ifdef GSPCA_DEBUG
891 /* activate the v4l2 debug */
892 if (gspca_debug & D_V4L2)
893 gspca_dev->vdev->debug |= V4L2_DEBUG_IOCTL
894 | V4L2_DEBUG_IOCTL_ARG;
895 else
896 gspca_dev->vdev->debug &= ~(V4L2_DEBUG_IOCTL
897 | V4L2_DEBUG_IOCTL_ARG);
898 #endif
899 ret = 0;
900 out:
901 mutex_unlock(&gspca_dev->queue_lock);
902 if (ret != 0)
903 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
904 else
905 PDEBUG(D_STREAM, "open done");
906 return ret;
907 }
908
909 static int dev_close(struct inode *inode, struct file *file)
910 {
911 struct gspca_dev *gspca_dev = file->private_data;
912
913 PDEBUG(D_STREAM, "%s close", current->comm);
914 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
915 return -ERESTARTSYS;
916 gspca_dev->users--;
917
918 /* if the file did the capture, free the streaming resources */
919 if (gspca_dev->capt_file == file) {
920 if (gspca_dev->streaming) {
921 mutex_lock(&gspca_dev->usb_lock);
922 gspca_stream_off(gspca_dev);
923 mutex_unlock(&gspca_dev->usb_lock);
924 }
925 frame_free(gspca_dev);
926 gspca_dev->capt_file = NULL;
927 gspca_dev->memory = GSPCA_MEMORY_NO;
928 }
929 file->private_data = NULL;
930 module_put(gspca_dev->module);
931 mutex_unlock(&gspca_dev->queue_lock);
932
933 PDEBUG(D_STREAM, "close done");
934
935 kref_put(&gspca_dev->kref, gspca_delete);
936
937 return 0;
938 }
939
940 static int vidioc_querycap(struct file *file, void *priv,
941 struct v4l2_capability *cap)
942 {
943 struct gspca_dev *gspca_dev = priv;
944
945 memset(cap, 0, sizeof *cap);
946 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
947 if (gspca_dev->dev->product != NULL) {
948 strncpy(cap->card, gspca_dev->dev->product,
949 sizeof cap->card);
950 } else {
951 snprintf(cap->card, sizeof cap->card,
952 "USB Camera (%04x:%04x)",
953 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
954 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
955 }
956 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
957 sizeof cap->bus_info);
958 cap->version = DRIVER_VERSION_NUMBER;
959 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
960 | V4L2_CAP_STREAMING
961 | V4L2_CAP_READWRITE;
962 return 0;
963 }
964
965 static int vidioc_queryctrl(struct file *file, void *priv,
966 struct v4l2_queryctrl *q_ctrl)
967 {
968 struct gspca_dev *gspca_dev = priv;
969 int i, ix;
970 u32 id;
971
972 ix = -1;
973 id = q_ctrl->id;
974 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
975 id &= V4L2_CTRL_ID_MASK;
976 id++;
977 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
978 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
979 continue;
980 if (ix < 0) {
981 ix = i;
982 continue;
983 }
984 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
985 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
986 continue;
987 ix = i;
988 }
989 }
990 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
991 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
992 ix = i;
993 break;
994 }
995 }
996 if (ix < 0)
997 return -EINVAL;
998 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
999 sizeof *q_ctrl);
1000 if (gspca_dev->ctrl_dis & (1 << ix))
1001 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1002 return 0;
1003 }
1004
1005 static int vidioc_s_ctrl(struct file *file, void *priv,
1006 struct v4l2_control *ctrl)
1007 {
1008 struct gspca_dev *gspca_dev = priv;
1009 const struct ctrl *ctrls;
1010 int i, ret;
1011
1012 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1013 i < gspca_dev->sd_desc->nctrls;
1014 i++, ctrls++) {
1015 if (ctrl->id != ctrls->qctrl.id)
1016 continue;
1017 if (gspca_dev->ctrl_dis & (1 << i))
1018 return -EINVAL;
1019 if (ctrl->value < ctrls->qctrl.minimum
1020 || ctrl->value > ctrls->qctrl.maximum)
1021 return -ERANGE;
1022 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1023 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1024 return -ERESTARTSYS;
1025 ret = ctrls->set(gspca_dev, ctrl->value);
1026 mutex_unlock(&gspca_dev->usb_lock);
1027 return ret;
1028 }
1029 return -EINVAL;
1030 }
1031
1032 static int vidioc_g_ctrl(struct file *file, void *priv,
1033 struct v4l2_control *ctrl)
1034 {
1035 struct gspca_dev *gspca_dev = priv;
1036
1037 const struct ctrl *ctrls;
1038 int i, ret;
1039
1040 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1041 i < gspca_dev->sd_desc->nctrls;
1042 i++, ctrls++) {
1043 if (ctrl->id != ctrls->qctrl.id)
1044 continue;
1045 if (gspca_dev->ctrl_dis & (1 << i))
1046 return -EINVAL;
1047 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1048 return -ERESTARTSYS;
1049 ret = ctrls->get(gspca_dev, &ctrl->value);
1050 mutex_unlock(&gspca_dev->usb_lock);
1051 return ret;
1052 }
1053 return -EINVAL;
1054 }
1055
1056 static int vidioc_querymenu(struct file *file, void *priv,
1057 struct v4l2_querymenu *qmenu)
1058 {
1059 struct gspca_dev *gspca_dev = priv;
1060
1061 if (!gspca_dev->sd_desc->querymenu)
1062 return -EINVAL;
1063 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1064 }
1065
1066 static int vidioc_enum_input(struct file *file, void *priv,
1067 struct v4l2_input *input)
1068 {
1069 struct gspca_dev *gspca_dev = priv;
1070
1071 if (input->index != 0)
1072 return -EINVAL;
1073 memset(input, 0, sizeof *input);
1074 input->type = V4L2_INPUT_TYPE_CAMERA;
1075 strncpy(input->name, gspca_dev->sd_desc->name,
1076 sizeof input->name);
1077 return 0;
1078 }
1079
1080 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1081 {
1082 *i = 0;
1083 return 0;
1084 }
1085
1086 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1087 {
1088 if (i > 0)
1089 return -EINVAL;
1090 return (0);
1091 }
1092
1093 static int vidioc_reqbufs(struct file *file, void *priv,
1094 struct v4l2_requestbuffers *rb)
1095 {
1096 struct gspca_dev *gspca_dev = priv;
1097 int i, ret = 0;
1098
1099 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1100 return -EINVAL;
1101 switch (rb->memory) {
1102 case GSPCA_MEMORY_READ: /* (internal call) */
1103 case V4L2_MEMORY_MMAP:
1104 case V4L2_MEMORY_USERPTR:
1105 break;
1106 default:
1107 return -EINVAL;
1108 }
1109 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1110 return -ERESTARTSYS;
1111
1112 if (gspca_dev->memory != GSPCA_MEMORY_NO
1113 && gspca_dev->memory != rb->memory) {
1114 ret = -EBUSY;
1115 goto out;
1116 }
1117
1118 /* only one file may do the capture */
1119 if (gspca_dev->capt_file != NULL
1120 && gspca_dev->capt_file != file) {
1121 ret = -EBUSY;
1122 goto out;
1123 }
1124
1125 /* if allocated, the buffers must not be mapped */
1126 for (i = 0; i < gspca_dev->nframes; i++) {
1127 if (gspca_dev->frame[i].vma_use_count) {
1128 ret = -EBUSY;
1129 goto out;
1130 }
1131 }
1132
1133 /* stop streaming */
1134 if (gspca_dev->streaming) {
1135 mutex_lock(&gspca_dev->usb_lock);
1136 gspca_stream_off(gspca_dev);
1137 mutex_unlock(&gspca_dev->usb_lock);
1138 }
1139
1140 /* free the previous allocated buffers, if any */
1141 if (gspca_dev->nframes != 0) {
1142 frame_free(gspca_dev);
1143 gspca_dev->capt_file = NULL;
1144 }
1145 if (rb->count == 0) /* unrequest */
1146 goto out;
1147 gspca_dev->memory = rb->memory;
1148 ret = frame_alloc(gspca_dev, rb->count);
1149 if (ret == 0) {
1150 rb->count = gspca_dev->nframes;
1151 gspca_dev->capt_file = file;
1152 }
1153 out:
1154 mutex_unlock(&gspca_dev->queue_lock);
1155 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1156 return ret;
1157 }
1158
1159 static int vidioc_querybuf(struct file *file, void *priv,
1160 struct v4l2_buffer *v4l2_buf)
1161 {
1162 struct gspca_dev *gspca_dev = priv;
1163 struct gspca_frame *frame;
1164
1165 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1166 || v4l2_buf->index < 0
1167 || v4l2_buf->index >= gspca_dev->nframes)
1168 return -EINVAL;
1169
1170 frame = &gspca_dev->frame[v4l2_buf->index];
1171 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1172 return 0;
1173 }
1174
1175 static int vidioc_streamon(struct file *file, void *priv,
1176 enum v4l2_buf_type buf_type)
1177 {
1178 struct gspca_dev *gspca_dev = priv;
1179 int ret;
1180
1181 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1182 return -EINVAL;
1183 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1184 return -ERESTARTSYS;
1185 if (!gspca_dev->present) {
1186 ret = -ENODEV;
1187 goto out;
1188 }
1189 if (gspca_dev->nframes == 0) {
1190 ret = -EINVAL;
1191 goto out;
1192 }
1193 if (!gspca_dev->streaming) {
1194 ret = gspca_init_transfer(gspca_dev);
1195 if (ret < 0)
1196 goto out;
1197 }
1198 #ifdef GSPCA_DEBUG
1199 if (gspca_debug & D_STREAM) {
1200 PDEBUG_MODE("stream on OK",
1201 gspca_dev->pixfmt,
1202 gspca_dev->width,
1203 gspca_dev->height);
1204 }
1205 #endif
1206 ret = 0;
1207 out:
1208 mutex_unlock(&gspca_dev->queue_lock);
1209 return ret;
1210 }
1211
1212 static int vidioc_streamoff(struct file *file, void *priv,
1213 enum v4l2_buf_type buf_type)
1214 {
1215 struct gspca_dev *gspca_dev = priv;
1216 int i, ret;
1217
1218 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1219 return -EINVAL;
1220 if (!gspca_dev->streaming)
1221 return 0;
1222 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1223 return -ERESTARTSYS;
1224
1225 /* stop streaming */
1226 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1227 ret = -ERESTARTSYS;
1228 goto out;
1229 }
1230 gspca_stream_off(gspca_dev);
1231 mutex_unlock(&gspca_dev->usb_lock);
1232
1233 /* empty the application queues */
1234 for (i = 0; i < gspca_dev->nframes; i++)
1235 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1236 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1237 gspca_dev->last_packet_type = DISCARD_PACKET;
1238 gspca_dev->sequence = 0;
1239 atomic_set(&gspca_dev->nevent, 0);
1240 ret = 0;
1241 out:
1242 mutex_unlock(&gspca_dev->queue_lock);
1243 return ret;
1244 }
1245
1246 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1247 struct v4l2_jpegcompression *jpegcomp)
1248 {
1249 struct gspca_dev *gspca_dev = priv;
1250 int ret;
1251
1252 if (!gspca_dev->sd_desc->get_jcomp)
1253 return -EINVAL;
1254 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1255 return -ERESTARTSYS;
1256 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1257 mutex_unlock(&gspca_dev->usb_lock);
1258 return ret;
1259 }
1260
1261 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1262 struct v4l2_jpegcompression *jpegcomp)
1263 {
1264 struct gspca_dev *gspca_dev = priv;
1265 int ret;
1266
1267 if (!gspca_dev->sd_desc->set_jcomp)
1268 return -EINVAL;
1269 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1270 return -ERESTARTSYS;
1271 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1272 mutex_unlock(&gspca_dev->usb_lock);
1273 return ret;
1274 }
1275
1276 static int vidioc_g_parm(struct file *filp, void *priv,
1277 struct v4l2_streamparm *parm)
1278 {
1279 struct gspca_dev *gspca_dev = priv;
1280
1281 memset(parm, 0, sizeof *parm);
1282 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1283 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1284 return 0;
1285 }
1286
1287 static int vidioc_s_parm(struct file *filp, void *priv,
1288 struct v4l2_streamparm *parm)
1289 {
1290 struct gspca_dev *gspca_dev = priv;
1291 int n;
1292
1293 n = parm->parm.capture.readbuffers;
1294 if (n == 0 || n > GSPCA_MAX_FRAMES)
1295 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1296 else
1297 gspca_dev->nbufread = n;
1298 return 0;
1299 }
1300
1301 static int vidioc_s_std(struct file *filp, void *priv,
1302 v4l2_std_id *parm)
1303 {
1304 return 0;
1305 }
1306
1307 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1308 static int vidiocgmbuf(struct file *file, void *priv,
1309 struct video_mbuf *mbuf)
1310 {
1311 struct gspca_dev *gspca_dev = file->private_data;
1312 int i;
1313
1314 PDEBUG(D_STREAM, "cgmbuf");
1315 if (gspca_dev->nframes == 0) {
1316 int ret;
1317
1318 {
1319 struct v4l2_format fmt;
1320
1321 memset(&fmt, 0, sizeof fmt);
1322 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1323 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1324 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1325 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1326 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1327 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1328 if (ret != 0)
1329 return ret;
1330 }
1331 {
1332 struct v4l2_requestbuffers rb;
1333
1334 memset(&rb, 0, sizeof rb);
1335 rb.count = 4;
1336 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1337 rb.memory = V4L2_MEMORY_MMAP;
1338 ret = vidioc_reqbufs(file, priv, &rb);
1339 if (ret != 0)
1340 return ret;
1341 }
1342 }
1343 mbuf->frames = gspca_dev->nframes;
1344 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1345 for (i = 0; i < mbuf->frames; i++)
1346 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1347 return 0;
1348 }
1349 #endif
1350
1351 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1352 {
1353 struct gspca_dev *gspca_dev = file->private_data;
1354 struct gspca_frame *frame;
1355 struct page *page;
1356 unsigned long addr, start, size;
1357 int i, ret;
1358
1359 start = vma->vm_start;
1360 size = vma->vm_end - vma->vm_start;
1361 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1362
1363 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1364 return -ERESTARTSYS;
1365 if (!gspca_dev->present) {
1366 ret = -ENODEV;
1367 goto out;
1368 }
1369 if (gspca_dev->capt_file != file) {
1370 ret = -EINVAL;
1371 goto out;
1372 }
1373
1374 frame = NULL;
1375 for (i = 0; i < gspca_dev->nframes; ++i) {
1376 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1377 PDEBUG(D_STREAM, "mmap bad memory type");
1378 break;
1379 }
1380 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1381 == vma->vm_pgoff) {
1382 frame = &gspca_dev->frame[i];
1383 break;
1384 }
1385 }
1386 if (frame == NULL) {
1387 PDEBUG(D_STREAM, "mmap no frame buffer found");
1388 ret = -EINVAL;
1389 goto out;
1390 }
1391 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1392 /* v4l1 maps all the buffers */
1393 if (i != 0
1394 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1395 #endif
1396 if (size != frame->v4l2_buf.length) {
1397 PDEBUG(D_STREAM, "mmap bad size");
1398 ret = -EINVAL;
1399 goto out;
1400 }
1401
1402 /*
1403 * - VM_IO marks the area as being a mmaped region for I/O to a
1404 * device. It also prevents the region from being core dumped.
1405 */
1406 vma->vm_flags |= VM_IO;
1407
1408 addr = (unsigned long) frame->data;
1409 while (size > 0) {
1410 page = vmalloc_to_page((void *) addr);
1411 ret = vm_insert_page(vma, start, page);
1412 if (ret < 0)
1413 goto out;
1414 start += PAGE_SIZE;
1415 addr += PAGE_SIZE;
1416 size -= PAGE_SIZE;
1417 }
1418
1419 vma->vm_ops = &gspca_vm_ops;
1420 vma->vm_private_data = frame;
1421 gspca_vm_open(vma);
1422 ret = 0;
1423 out:
1424 mutex_unlock(&gspca_dev->queue_lock);
1425 return ret;
1426 }
1427
1428 /*
1429 * wait for a video frame
1430 *
1431 * If a frame is ready, its index is returned.
1432 */
1433 static int frame_wait(struct gspca_dev *gspca_dev,
1434 int nonblock_ing)
1435 {
1436 struct gspca_frame *frame;
1437 int i, j, ret;
1438
1439 /* check if a frame is ready */
1440 i = gspca_dev->fr_o;
1441 j = gspca_dev->fr_queue[i];
1442 frame = &gspca_dev->frame[j];
1443 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1444 atomic_dec(&gspca_dev->nevent);
1445 goto ok;
1446 }
1447 if (nonblock_ing) /* no frame yet */
1448 return -EAGAIN;
1449
1450 /* wait till a frame is ready */
1451 for (;;) {
1452 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1453 atomic_read(&gspca_dev->nevent) > 0,
1454 msecs_to_jiffies(3000));
1455 if (ret <= 0) {
1456 if (ret < 0)
1457 return ret; /* interrupt */
1458 return -EIO; /* timeout */
1459 }
1460 atomic_dec(&gspca_dev->nevent);
1461 if (!gspca_dev->streaming || !gspca_dev->present)
1462 return -EIO;
1463 i = gspca_dev->fr_o;
1464 j = gspca_dev->fr_queue[i];
1465 frame = &gspca_dev->frame[j];
1466 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1467 break;
1468 }
1469 ok:
1470 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1471 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1472 gspca_dev->fr_q,
1473 gspca_dev->fr_i,
1474 gspca_dev->fr_o);
1475
1476 if (gspca_dev->sd_desc->dq_callback) {
1477 mutex_lock(&gspca_dev->usb_lock);
1478 gspca_dev->sd_desc->dq_callback(gspca_dev);
1479 mutex_unlock(&gspca_dev->usb_lock);
1480 }
1481 return j;
1482 }
1483
1484 /*
1485 * dequeue a video buffer
1486 *
1487 * If nonblock_ing is false, block until a buffer is available.
1488 */
1489 static int vidioc_dqbuf(struct file *file, void *priv,
1490 struct v4l2_buffer *v4l2_buf)
1491 {
1492 struct gspca_dev *gspca_dev = priv;
1493 struct gspca_frame *frame;
1494 int i, ret;
1495
1496 PDEBUG(D_FRAM, "dqbuf");
1497 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1498 return -EINVAL;
1499 if (v4l2_buf->memory != gspca_dev->memory)
1500 return -EINVAL;
1501
1502 /* if not streaming, be sure the application will not loop forever */
1503 if (!(file->f_flags & O_NONBLOCK)
1504 && !gspca_dev->streaming && gspca_dev->users == 1)
1505 return -EINVAL;
1506
1507 /* only the capturing file may dequeue */
1508 if (gspca_dev->capt_file != file)
1509 return -EINVAL;
1510
1511 /* only one dequeue / read at a time */
1512 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1513 return -ERESTARTSYS;
1514
1515 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1516 if (ret < 0)
1517 goto out;
1518 i = ret; /* frame index */
1519 frame = &gspca_dev->frame[i];
1520 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1521 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1522 frame->data,
1523 frame->v4l2_buf.bytesused)) {
1524 PDEBUG(D_ERR|D_STREAM,
1525 "dqbuf cp to user failed");
1526 ret = -EFAULT;
1527 goto out;
1528 }
1529 }
1530 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1531 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1532 PDEBUG(D_FRAM, "dqbuf %d", i);
1533 ret = 0;
1534 out:
1535 mutex_unlock(&gspca_dev->read_lock);
1536 return ret;
1537 }
1538
1539 /*
1540 * queue a video buffer
1541 *
1542 * Attempting to queue a buffer that has already been
1543 * queued will return -EINVAL.
1544 */
1545 static int vidioc_qbuf(struct file *file, void *priv,
1546 struct v4l2_buffer *v4l2_buf)
1547 {
1548 struct gspca_dev *gspca_dev = priv;
1549 struct gspca_frame *frame;
1550 int i, index, ret;
1551
1552 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1553 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1554 return -EINVAL;
1555
1556 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1557 return -ERESTARTSYS;
1558
1559 index = v4l2_buf->index;
1560 if ((unsigned) index >= gspca_dev->nframes) {
1561 PDEBUG(D_FRAM,
1562 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1563 ret = -EINVAL;
1564 goto out;
1565 }
1566 if (v4l2_buf->memory != gspca_dev->memory) {
1567 PDEBUG(D_FRAM, "qbuf bad memory type");
1568 ret = -EINVAL;
1569 goto out;
1570 }
1571
1572 frame = &gspca_dev->frame[index];
1573 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1574 PDEBUG(D_FRAM, "qbuf bad state");
1575 ret = -EINVAL;
1576 goto out;
1577 }
1578
1579 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1580
1581 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1582 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1583 frame->v4l2_buf.length = v4l2_buf->length;
1584 }
1585
1586 /* put the buffer in the 'queued' queue */
1587 i = gspca_dev->fr_q;
1588 gspca_dev->fr_queue[i] = index;
1589 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1590 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1591 gspca_dev->fr_q,
1592 gspca_dev->fr_i,
1593 gspca_dev->fr_o);
1594
1595 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1596 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1597 ret = 0;
1598 out:
1599 mutex_unlock(&gspca_dev->queue_lock);
1600 return ret;
1601 }
1602
1603 /*
1604 * allocate the resources for read()
1605 */
1606 static int read_alloc(struct gspca_dev *gspca_dev,
1607 struct file *file)
1608 {
1609 struct v4l2_buffer v4l2_buf;
1610 int i, ret;
1611
1612 PDEBUG(D_STREAM, "read alloc");
1613 if (gspca_dev->nframes == 0) {
1614 struct v4l2_requestbuffers rb;
1615
1616 memset(&rb, 0, sizeof rb);
1617 rb.count = gspca_dev->nbufread;
1618 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1619 rb.memory = GSPCA_MEMORY_READ;
1620 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1621 if (ret != 0) {
1622 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1623 return ret;
1624 }
1625 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1626 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1627 v4l2_buf.memory = GSPCA_MEMORY_READ;
1628 for (i = 0; i < gspca_dev->nbufread; i++) {
1629 v4l2_buf.index = i;
1630 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1631 if (ret != 0) {
1632 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1633 return ret;
1634 }
1635 }
1636 gspca_dev->memory = GSPCA_MEMORY_READ;
1637 }
1638
1639 /* start streaming */
1640 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1641 if (ret != 0)
1642 PDEBUG(D_STREAM, "read streamon err %d", ret);
1643 return ret;
1644 }
1645
1646 static unsigned int dev_poll(struct file *file, poll_table *wait)
1647 {
1648 struct gspca_dev *gspca_dev = file->private_data;
1649 int i, ret;
1650
1651 PDEBUG(D_FRAM, "poll");
1652
1653 poll_wait(file, &gspca_dev->wq, wait);
1654 if (!gspca_dev->present)
1655 return POLLERR;
1656
1657 /* if reqbufs is not done, the user would use read() */
1658 if (gspca_dev->nframes == 0) {
1659 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1660 return POLLERR; /* not the 1st time */
1661 ret = read_alloc(gspca_dev, file);
1662 if (ret != 0)
1663 return POLLERR;
1664 }
1665
1666 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1667 return POLLERR;
1668 if (!gspca_dev->present) {
1669 ret = POLLERR;
1670 goto out;
1671 }
1672
1673 /* check the next incoming buffer */
1674 i = gspca_dev->fr_o;
1675 i = gspca_dev->fr_queue[i];
1676 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1677 ret = POLLIN | POLLRDNORM; /* something to read */
1678 else
1679 ret = 0;
1680 out:
1681 mutex_unlock(&gspca_dev->queue_lock);
1682 return ret;
1683 }
1684
1685 static ssize_t dev_read(struct file *file, char __user *data,
1686 size_t count, loff_t *ppos)
1687 {
1688 struct gspca_dev *gspca_dev = file->private_data;
1689 struct gspca_frame *frame;
1690 struct v4l2_buffer v4l2_buf;
1691 struct timeval timestamp;
1692 int n, ret, ret2;
1693
1694 PDEBUG(D_FRAM, "read (%zd)", count);
1695 if (!gspca_dev->present)
1696 return -ENODEV;
1697 switch (gspca_dev->memory) {
1698 case GSPCA_MEMORY_NO: /* first time */
1699 ret = read_alloc(gspca_dev, file);
1700 if (ret != 0)
1701 return ret;
1702 break;
1703 case GSPCA_MEMORY_READ:
1704 if (gspca_dev->capt_file == file)
1705 break;
1706 /* fall thru */
1707 default:
1708 return -EINVAL;
1709 }
1710
1711 /* get a frame */
1712 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1713 timestamp.tv_sec--;
1714 n = 2;
1715 for (;;) {
1716 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1717 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1718 v4l2_buf.memory = GSPCA_MEMORY_READ;
1719 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1720 if (ret != 0) {
1721 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1722 return ret;
1723 }
1724
1725 /* if the process slept for more than 1 second,
1726 * get a newer frame */
1727 frame = &gspca_dev->frame[v4l2_buf.index];
1728 if (--n < 0)
1729 break; /* avoid infinite loop */
1730 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1731 break;
1732 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1733 if (ret != 0) {
1734 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1735 return ret;
1736 }
1737 }
1738
1739 /* copy the frame */
1740 if (count > frame->v4l2_buf.bytesused)
1741 count = frame->v4l2_buf.bytesused;
1742 ret = copy_to_user(data, frame->data, count);
1743 if (ret != 0) {
1744 PDEBUG(D_ERR|D_STREAM,
1745 "read cp to user lack %d / %zd", ret, count);
1746 ret = -EFAULT;
1747 goto out;
1748 }
1749 ret = count;
1750 out:
1751 /* in each case, requeue the buffer */
1752 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1753 if (ret2 != 0)
1754 return ret2;
1755 return ret;
1756 }
1757
1758 static struct file_operations dev_fops = {
1759 .owner = THIS_MODULE,
1760 .open = dev_open,
1761 .release = dev_close,
1762 .read = dev_read,
1763 .mmap = dev_mmap,
1764 .ioctl = video_ioctl2,
1765 #ifdef CONFIG_COMPAT
1766 .compat_ioctl = v4l_compat_ioctl32,
1767 #endif
1768 .llseek = no_llseek,
1769 .poll = dev_poll,
1770 };
1771
1772 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1773 .vidioc_querycap = vidioc_querycap,
1774 .vidioc_dqbuf = vidioc_dqbuf,
1775 .vidioc_qbuf = vidioc_qbuf,
1776 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1777 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1778 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1779 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1780 .vidioc_streamon = vidioc_streamon,
1781 .vidioc_queryctrl = vidioc_queryctrl,
1782 .vidioc_g_ctrl = vidioc_g_ctrl,
1783 .vidioc_s_ctrl = vidioc_s_ctrl,
1784 .vidioc_querymenu = vidioc_querymenu,
1785 .vidioc_enum_input = vidioc_enum_input,
1786 .vidioc_g_input = vidioc_g_input,
1787 .vidioc_s_input = vidioc_s_input,
1788 .vidioc_reqbufs = vidioc_reqbufs,
1789 .vidioc_querybuf = vidioc_querybuf,
1790 .vidioc_streamoff = vidioc_streamoff,
1791 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1792 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1793 .vidioc_g_parm = vidioc_g_parm,
1794 .vidioc_s_parm = vidioc_s_parm,
1795 .vidioc_s_std = vidioc_s_std,
1796 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1797 .vidiocgmbuf = vidiocgmbuf,
1798 #endif
1799 };
1800
1801 static struct video_device gspca_template = {
1802 .name = "gspca main driver",
1803 .fops = &dev_fops,
1804 .ioctl_ops = &dev_ioctl_ops,
1805 .release = video_device_release,
1806 .minor = -1,
1807 };
1808
1809 /*
1810 * probe and create a new gspca device
1811 *
1812 * This function must be called by the sub-driver when it is
1813 * called for probing a new device.
1814 */
1815 int gspca_dev_probe(struct usb_interface *intf,
1816 const struct usb_device_id *id,
1817 const struct sd_desc *sd_desc,
1818 int dev_size,
1819 struct module *module)
1820 {
1821 struct usb_interface_descriptor *interface;
1822 struct gspca_dev *gspca_dev;
1823 struct usb_device *dev = interface_to_usbdev(intf);
1824 int ret;
1825
1826 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1827
1828 /* we don't handle multi-config cameras */
1829 if (dev->descriptor.bNumConfigurations != 1)
1830 return -ENODEV;
1831 interface = &intf->cur_altsetting->desc;
1832 if (interface->bInterfaceNumber > 0)
1833 return -ENODEV;
1834
1835 /* create the device */
1836 if (dev_size < sizeof *gspca_dev)
1837 dev_size = sizeof *gspca_dev;
1838 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1839 if (!gspca_dev) {
1840 err("couldn't kzalloc gspca struct");
1841 return -ENOMEM;
1842 }
1843 kref_init(&gspca_dev->kref);
1844 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1845 if (!gspca_dev->usb_buf) {
1846 err("out of memory");
1847 ret = -ENOMEM;
1848 goto out;
1849 }
1850 gspca_dev->dev = dev;
1851 gspca_dev->iface = interface->bInterfaceNumber;
1852 gspca_dev->nbalt = intf->num_altsetting;
1853 gspca_dev->sd_desc = sd_desc;
1854 gspca_dev->nbufread = 2;
1855
1856 /* configure the subdriver and initialize the USB device */
1857 ret = gspca_dev->sd_desc->config(gspca_dev, id);
1858 if (ret < 0)
1859 goto out;
1860 ret = gspca_dev->sd_desc->init(gspca_dev);
1861 if (ret < 0)
1862 goto out;
1863 ret = gspca_set_alt0(gspca_dev);
1864 if (ret < 0)
1865 goto out;
1866 gspca_set_default_mode(gspca_dev);
1867
1868 mutex_init(&gspca_dev->usb_lock);
1869 mutex_init(&gspca_dev->read_lock);
1870 mutex_init(&gspca_dev->queue_lock);
1871 init_waitqueue_head(&gspca_dev->wq);
1872
1873 /* init video stuff */
1874 gspca_dev->vdev = video_device_alloc();
1875 memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1876 gspca_dev->vdev->parent = &dev->dev;
1877 gspca_dev->module = module;
1878 gspca_dev->present = 1;
1879 video_set_drvdata(gspca_dev->vdev, gspca_dev);
1880 ret = video_register_device(gspca_dev->vdev,
1881 VFL_TYPE_GRABBER,
1882 video_nr);
1883 if (ret < 0) {
1884 err("video_register_device err %d", ret);
1885 video_device_release(gspca_dev->vdev);
1886 goto out;
1887 }
1888
1889 usb_set_intfdata(intf, gspca_dev);
1890 PDEBUG(D_PROBE, "probe ok");
1891 return 0;
1892 out:
1893 kfree(gspca_dev->usb_buf);
1894 kfree(gspca_dev);
1895 return ret;
1896 }
1897 EXPORT_SYMBOL(gspca_dev_probe);
1898
1899 /*
1900 * USB disconnection
1901 *
1902 * This function must be called by the sub-driver
1903 * when the device disconnects, after the specific resources are freed.
1904 */
1905 void gspca_disconnect(struct usb_interface *intf)
1906 {
1907 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1908
1909 usb_set_intfdata(intf, NULL);
1910
1911 /* We don't want people trying to open up the device */
1912 video_unregister_device(gspca_dev->vdev);
1913
1914 gspca_dev->present = 0;
1915 gspca_dev->streaming = 0;
1916
1917 kref_put(&gspca_dev->kref, gspca_delete);
1918
1919 PDEBUG(D_PROBE, "disconnect complete");
1920 }
1921 EXPORT_SYMBOL(gspca_disconnect);
1922
1923 #ifdef CONFIG_PM
1924 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1925 {
1926 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1927
1928 if (!gspca_dev->streaming)
1929 return 0;
1930 gspca_dev->frozen = 1; /* avoid urb error messages */
1931 if (gspca_dev->sd_desc->stopN)
1932 gspca_dev->sd_desc->stopN(gspca_dev);
1933 destroy_urbs(gspca_dev);
1934 gspca_set_alt0(gspca_dev);
1935 if (gspca_dev->sd_desc->stop0)
1936 gspca_dev->sd_desc->stop0(gspca_dev);
1937 return 0;
1938 }
1939 EXPORT_SYMBOL(gspca_suspend);
1940
1941 int gspca_resume(struct usb_interface *intf)
1942 {
1943 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1944
1945 gspca_dev->frozen = 0;
1946 gspca_dev->sd_desc->init(gspca_dev);
1947 if (gspca_dev->streaming)
1948 return gspca_init_transfer(gspca_dev);
1949 return 0;
1950 }
1951 EXPORT_SYMBOL(gspca_resume);
1952 #endif
1953 /* -- cam driver utility functions -- */
1954
1955 /* auto gain and exposure algorithm based on the knee algorithm described here:
1956 http://ytse.tricolour.net/docs/LowLightOptimization.html
1957
1958 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1959 where changed. */
1960 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1961 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1962 {
1963 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1964 const struct ctrl *gain_ctrl = NULL;
1965 const struct ctrl *exposure_ctrl = NULL;
1966 const struct ctrl *autogain_ctrl = NULL;
1967 int retval = 0;
1968
1969 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1970 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1971 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1972 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1973 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1974 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1975 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976 }
1977 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1978 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1979 "on cam without (auto)gain/exposure");
1980 return 0;
1981 }
1982
1983 if (gain_ctrl->get(gspca_dev, &gain) ||
1984 exposure_ctrl->get(gspca_dev, &exposure) ||
1985 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1986 return 0;
1987
1988 orig_gain = gain;
1989 orig_exposure = exposure;
1990
1991 /* If we are of a multiple of deadzone, do multiple steps to reach the
1992 desired lumination fast (with the risc of a slight overshoot) */
1993 steps = abs(desired_avg_lum - avg_lum) / deadzone;
1994
1995 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1996 avg_lum, desired_avg_lum, steps);
1997
1998 for (i = 0; i < steps; i++) {
1999 if (avg_lum > desired_avg_lum) {
2000 if (gain > gain_knee)
2001 gain--;
2002 else if (exposure > exposure_knee)
2003 exposure--;
2004 else if (gain > gain_ctrl->qctrl.default_value)
2005 gain--;
2006 else if (exposure > exposure_ctrl->qctrl.minimum)
2007 exposure--;
2008 else if (gain > gain_ctrl->qctrl.minimum)
2009 gain--;
2010 else
2011 break;
2012 } else {
2013 if (gain < gain_ctrl->qctrl.default_value)
2014 gain++;
2015 else if (exposure < exposure_knee)
2016 exposure++;
2017 else if (gain < gain_knee)
2018 gain++;
2019 else if (exposure < exposure_ctrl->qctrl.maximum)
2020 exposure++;
2021 else if (gain < gain_ctrl->qctrl.maximum)
2022 gain++;
2023 else
2024 break;
2025 }
2026 }
2027
2028 if (gain != orig_gain) {
2029 gain_ctrl->set(gspca_dev, gain);
2030 retval = 1;
2031 }
2032 if (exposure != orig_exposure) {
2033 exposure_ctrl->set(gspca_dev, exposure);
2034 retval = 1;
2035 }
2036
2037 return retval;
2038 }
2039 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2040
2041 /* -- module insert / remove -- */
2042 static int __init gspca_init(void)
2043 {
2044 info("main v%d.%d.%d registered",
2045 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2046 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2047 DRIVER_VERSION_NUMBER & 0xff);
2048 return 0;
2049 }
2050 static void __exit gspca_exit(void)
2051 {
2052 info("main deregistered");
2053 }
2054
2055 module_init(gspca_init);
2056 module_exit(gspca_exit);
2057
2058 #ifdef GSPCA_DEBUG
2059 module_param_named(debug, gspca_debug, int, 0644);
2060 MODULE_PARM_DESC(debug,
2061 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2062 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2063 " 0x0100: v4l2");
2064 #endif
Linux kernel - Deliverables
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