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Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2009 Jean-Francois Moine (http://moinejf.free.fr)
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
37
38 #include "gspca.h"
39
40 /* global values */
41 #define DEF_NURBS 3 /* default number of URBs */
42 #if DEF_NURBS > MAX_NURBS
43 #error "DEF_NURBS too big"
44 #endif
45
46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
48 MODULE_LICENSE("GPL");
49
50 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 6, 0)
51
52 #ifdef GSPCA_DEBUG
53 int gspca_debug = D_ERR | D_PROBE;
54 EXPORT_SYMBOL(gspca_debug);
55
56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 {
58 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60 txt,
61 pixfmt & 0xff,
62 (pixfmt >> 8) & 0xff,
63 (pixfmt >> 16) & 0xff,
64 pixfmt >> 24,
65 w, h);
66 } else {
67 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68 txt,
69 pixfmt,
70 w, h);
71 }
72 }
73 #else
74 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 #endif
76
77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
78 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
79 #define GSPCA_MEMORY_READ 7
80
81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
82
83 /*
84 * VMA operations.
85 */
86 static void gspca_vm_open(struct vm_area_struct *vma)
87 {
88 struct gspca_frame *frame = vma->vm_private_data;
89
90 frame->vma_use_count++;
91 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 }
93
94 static void gspca_vm_close(struct vm_area_struct *vma)
95 {
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 if (--frame->vma_use_count <= 0)
99 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static struct vm_operations_struct gspca_vm_ops = {
103 .open = gspca_vm_open,
104 .close = gspca_vm_close,
105 };
106
107 /* get the current input frame buffer */
108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 {
110 struct gspca_frame *frame;
111 int i;
112
113 i = gspca_dev->fr_i;
114 i = gspca_dev->fr_queue[i];
115 frame = &gspca_dev->frame[i];
116 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117 != V4L2_BUF_FLAG_QUEUED)
118 return NULL;
119 return frame;
120 }
121 EXPORT_SYMBOL(gspca_get_i_frame);
122
123 /*
124 * fill a video frame from an URB and resubmit
125 */
126 static void fill_frame(struct gspca_dev *gspca_dev,
127 struct urb *urb)
128 {
129 struct gspca_frame *frame;
130 u8 *data; /* address of data in the iso message */
131 int i, len, st;
132 cam_pkt_op pkt_scan;
133
134 if (urb->status != 0) {
135 if (urb->status == -ESHUTDOWN)
136 return; /* disconnection */
137 #ifdef CONFIG_PM
138 if (!gspca_dev->frozen)
139 #endif
140 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
141 return;
142 }
143 pkt_scan = gspca_dev->sd_desc->pkt_scan;
144 for (i = 0; i < urb->number_of_packets; i++) {
145
146 /* check the availability of the frame buffer */
147 frame = gspca_get_i_frame(gspca_dev);
148 if (!frame) {
149 gspca_dev->last_packet_type = DISCARD_PACKET;
150 break;
151 }
152
153 /* check the packet status and length */
154 len = urb->iso_frame_desc[i].actual_length;
155 if (len == 0) {
156 if (gspca_dev->empty_packet == 0)
157 gspca_dev->empty_packet = 1;
158 continue;
159 }
160 st = urb->iso_frame_desc[i].status;
161 if (st) {
162 PDEBUG(D_ERR,
163 "ISOC data error: [%d] len=%d, status=%d",
164 i, len, st);
165 gspca_dev->last_packet_type = DISCARD_PACKET;
166 continue;
167 }
168
169 /* let the packet be analyzed by the subdriver */
170 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
171 i, urb->iso_frame_desc[i].offset, len);
172 data = (u8 *) urb->transfer_buffer
173 + urb->iso_frame_desc[i].offset;
174 pkt_scan(gspca_dev, frame, data, len);
175 }
176
177 /* resubmit the URB */
178 st = usb_submit_urb(urb, GFP_ATOMIC);
179 if (st < 0)
180 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
181 }
182
183 /*
184 * ISOC message interrupt from the USB device
185 *
186 * Analyse each packet and call the subdriver for copy to the frame buffer.
187 */
188 static void isoc_irq(struct urb *urb)
189 {
190 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
191
192 PDEBUG(D_PACK, "isoc irq");
193 if (!gspca_dev->streaming)
194 return;
195 fill_frame(gspca_dev, urb);
196 }
197
198 /*
199 * bulk message interrupt from the USB device
200 */
201 static void bulk_irq(struct urb *urb)
202 {
203 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
204 struct gspca_frame *frame;
205 int st;
206
207 PDEBUG(D_PACK, "bulk irq");
208 if (!gspca_dev->streaming)
209 return;
210 switch (urb->status) {
211 case 0:
212 break;
213 case -ESHUTDOWN:
214 return; /* disconnection */
215 case -ECONNRESET:
216 urb->status = 0;
217 break;
218 default:
219 #ifdef CONFIG_PM
220 if (!gspca_dev->frozen)
221 #endif
222 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
223 return;
224 }
225
226 /* check the availability of the frame buffer */
227 frame = gspca_get_i_frame(gspca_dev);
228 if (!frame) {
229 gspca_dev->last_packet_type = DISCARD_PACKET;
230 } else {
231 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
232 gspca_dev->sd_desc->pkt_scan(gspca_dev,
233 frame,
234 urb->transfer_buffer,
235 urb->actual_length);
236 }
237
238 /* resubmit the URB */
239 if (gspca_dev->cam.bulk_nurbs != 0) {
240 st = usb_submit_urb(urb, GFP_ATOMIC);
241 if (st < 0)
242 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
243 }
244 }
245
246 /*
247 * add data to the current frame
248 *
249 * This function is called by the subdrivers at interrupt level.
250 *
251 * To build a frame, these ones must add
252 * - one FIRST_PACKET
253 * - 0 or many INTER_PACKETs
254 * - one LAST_PACKET
255 * DISCARD_PACKET invalidates the whole frame.
256 * On LAST_PACKET, a new frame is returned.
257 */
258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
259 enum gspca_packet_type packet_type,
260 struct gspca_frame *frame,
261 const __u8 *data,
262 int len)
263 {
264 int i, j;
265
266 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
267
268 /* when start of a new frame, if the current frame buffer
269 * is not queued, discard the whole frame */
270 if (packet_type == FIRST_PACKET) {
271 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
272 != V4L2_BUF_FLAG_QUEUED) {
273 gspca_dev->last_packet_type = DISCARD_PACKET;
274 return frame;
275 }
276 frame->data_end = frame->data;
277 jiffies_to_timeval(get_jiffies_64(),
278 &frame->v4l2_buf.timestamp);
279 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
280 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
281 if (packet_type == LAST_PACKET)
282 gspca_dev->last_packet_type = packet_type;
283 return frame;
284 }
285
286 /* append the packet to the frame buffer */
287 if (len > 0) {
288 if (frame->data_end - frame->data + len
289 > frame->v4l2_buf.length) {
290 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
291 frame->data_end - frame->data + len,
292 frame->v4l2_buf.length);
293 packet_type = DISCARD_PACKET;
294 } else {
295 memcpy(frame->data_end, data, len);
296 frame->data_end += len;
297 }
298 }
299 gspca_dev->last_packet_type = packet_type;
300
301 /* if last packet, wake up the application and advance in the queue */
302 if (packet_type == LAST_PACKET) {
303 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
304 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
305 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
306 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
307 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
308 gspca_dev->fr_i = i;
309 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
310 frame->v4l2_buf.bytesused,
311 gspca_dev->fr_q,
312 i,
313 gspca_dev->fr_o);
314 j = gspca_dev->fr_queue[i];
315 frame = &gspca_dev->frame[j];
316 }
317 return frame;
318 }
319 EXPORT_SYMBOL(gspca_frame_add);
320
321 static int gspca_is_compressed(__u32 format)
322 {
323 switch (format) {
324 case V4L2_PIX_FMT_MJPEG:
325 case V4L2_PIX_FMT_JPEG:
326 case V4L2_PIX_FMT_SPCA561:
327 case V4L2_PIX_FMT_PAC207:
328 case V4L2_PIX_FMT_MR97310A:
329 return 1;
330 }
331 return 0;
332 }
333
334 static void *rvmalloc(unsigned long size)
335 {
336 void *mem;
337 unsigned long adr;
338
339 mem = vmalloc_32(size);
340 if (mem != NULL) {
341 adr = (unsigned long) mem;
342 while ((long) size > 0) {
343 SetPageReserved(vmalloc_to_page((void *) adr));
344 adr += PAGE_SIZE;
345 size -= PAGE_SIZE;
346 }
347 }
348 return mem;
349 }
350
351 static void rvfree(void *mem, long size)
352 {
353 unsigned long adr;
354
355 adr = (unsigned long) mem;
356 while (size > 0) {
357 ClearPageReserved(vmalloc_to_page((void *) adr));
358 adr += PAGE_SIZE;
359 size -= PAGE_SIZE;
360 }
361 vfree(mem);
362 }
363
364 static int frame_alloc(struct gspca_dev *gspca_dev,
365 unsigned int count)
366 {
367 struct gspca_frame *frame;
368 unsigned int frsz;
369 int i;
370
371 i = gspca_dev->curr_mode;
372 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
373 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
374 frsz = PAGE_ALIGN(frsz);
375 gspca_dev->frsz = frsz;
376 if (count > GSPCA_MAX_FRAMES)
377 count = GSPCA_MAX_FRAMES;
378 gspca_dev->frbuf = rvmalloc(frsz * count);
379 if (!gspca_dev->frbuf) {
380 err("frame alloc failed");
381 return -ENOMEM;
382 }
383 gspca_dev->nframes = count;
384 for (i = 0; i < count; i++) {
385 frame = &gspca_dev->frame[i];
386 frame->v4l2_buf.index = i;
387 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
388 frame->v4l2_buf.flags = 0;
389 frame->v4l2_buf.field = V4L2_FIELD_NONE;
390 frame->v4l2_buf.length = frsz;
391 frame->v4l2_buf.memory = gspca_dev->memory;
392 frame->v4l2_buf.sequence = 0;
393 frame->data = frame->data_end =
394 gspca_dev->frbuf + i * frsz;
395 frame->v4l2_buf.m.offset = i * frsz;
396 }
397 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
398 gspca_dev->last_packet_type = DISCARD_PACKET;
399 gspca_dev->sequence = 0;
400 return 0;
401 }
402
403 static void frame_free(struct gspca_dev *gspca_dev)
404 {
405 int i;
406
407 PDEBUG(D_STREAM, "frame free");
408 if (gspca_dev->frbuf != NULL) {
409 rvfree(gspca_dev->frbuf,
410 gspca_dev->nframes * gspca_dev->frsz);
411 gspca_dev->frbuf = NULL;
412 for (i = 0; i < gspca_dev->nframes; i++)
413 gspca_dev->frame[i].data = NULL;
414 }
415 gspca_dev->nframes = 0;
416 }
417
418 static void destroy_urbs(struct gspca_dev *gspca_dev)
419 {
420 struct urb *urb;
421 unsigned int i;
422
423 PDEBUG(D_STREAM, "kill transfer");
424 for (i = 0; i < MAX_NURBS; i++) {
425 urb = gspca_dev->urb[i];
426 if (urb == NULL)
427 break;
428
429 gspca_dev->urb[i] = NULL;
430 usb_kill_urb(urb);
431 if (urb->transfer_buffer != NULL)
432 usb_buffer_free(gspca_dev->dev,
433 urb->transfer_buffer_length,
434 urb->transfer_buffer,
435 urb->transfer_dma);
436 usb_free_urb(urb);
437 }
438 }
439
440 /*
441 * look for an input transfer endpoint in an alternate setting
442 */
443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
444 int xfer)
445 {
446 struct usb_host_endpoint *ep;
447 int i, attr;
448
449 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
450 ep = &alt->endpoint[i];
451 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
452 if (attr == xfer
453 && ep->desc.wMaxPacketSize != 0)
454 return ep;
455 }
456 return NULL;
457 }
458
459 /*
460 * look for an input (isoc or bulk) endpoint
461 *
462 * The endpoint is defined by the subdriver.
463 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
464 * This routine may be called many times when the bandwidth is too small
465 * (the bandwidth is checked on urb submit).
466 */
467 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
468 {
469 struct usb_interface *intf;
470 struct usb_host_endpoint *ep;
471 int xfer, i, ret;
472
473 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
474 ep = NULL;
475 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
476 : USB_ENDPOINT_XFER_ISOC;
477 i = gspca_dev->alt; /* previous alt setting */
478 while (--i >= 0) {
479 ep = alt_xfer(&intf->altsetting[i], xfer);
480 if (ep)
481 break;
482 }
483 if (ep == NULL) {
484 err("no transfer endpoint found");
485 return NULL;
486 }
487 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
488 i, ep->desc.bEndpointAddress);
489 if (gspca_dev->nbalt > 1) {
490 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
491 if (ret < 0) {
492 err("set alt %d err %d", i, ret);
493 return NULL;
494 }
495 }
496 gspca_dev->alt = i; /* memorize the current alt setting */
497 return ep;
498 }
499
500 /*
501 * create the URBs for image transfer
502 */
503 static int create_urbs(struct gspca_dev *gspca_dev,
504 struct usb_host_endpoint *ep)
505 {
506 struct urb *urb;
507 int n, nurbs, i, psize, npkt, bsize;
508
509 /* calculate the packet size and the number of packets */
510 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
511
512 if (!gspca_dev->cam.bulk) { /* isoc */
513
514 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
515 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
516 npkt = gspca_dev->cam.npkt;
517 if (npkt == 0)
518 npkt = 32; /* default value */
519 bsize = psize * npkt;
520 PDEBUG(D_STREAM,
521 "isoc %d pkts size %d = bsize:%d",
522 npkt, psize, bsize);
523 nurbs = DEF_NURBS;
524 } else { /* bulk */
525 npkt = 0;
526 bsize = gspca_dev->cam.bulk_size;
527 if (bsize == 0)
528 bsize = psize;
529 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
530 if (gspca_dev->cam.bulk_nurbs != 0)
531 nurbs = gspca_dev->cam.bulk_nurbs;
532 else
533 nurbs = 1;
534 }
535
536 gspca_dev->nurbs = nurbs;
537 for (n = 0; n < nurbs; n++) {
538 urb = usb_alloc_urb(npkt, GFP_KERNEL);
539 if (!urb) {
540 err("usb_alloc_urb failed");
541 destroy_urbs(gspca_dev);
542 return -ENOMEM;
543 }
544 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
545 bsize,
546 GFP_KERNEL,
547 &urb->transfer_dma);
548
549 if (urb->transfer_buffer == NULL) {
550 usb_free_urb(urb);
551 err("usb_buffer_urb failed");
552 destroy_urbs(gspca_dev);
553 return -ENOMEM;
554 }
555 gspca_dev->urb[n] = urb;
556 urb->dev = gspca_dev->dev;
557 urb->context = gspca_dev;
558 urb->transfer_buffer_length = bsize;
559 if (npkt != 0) { /* ISOC */
560 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
561 ep->desc.bEndpointAddress);
562 urb->transfer_flags = URB_ISO_ASAP
563 | URB_NO_TRANSFER_DMA_MAP;
564 urb->interval = ep->desc.bInterval;
565 urb->complete = isoc_irq;
566 urb->number_of_packets = npkt;
567 for (i = 0; i < npkt; i++) {
568 urb->iso_frame_desc[i].length = psize;
569 urb->iso_frame_desc[i].offset = psize * i;
570 }
571 } else { /* bulk */
572 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
573 ep->desc.bEndpointAddress),
574 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
575 urb->complete = bulk_irq;
576 }
577 }
578 return 0;
579 }
580
581 /*
582 * start the USB transfer
583 */
584 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
585 {
586 struct usb_host_endpoint *ep;
587 int n, ret;
588
589 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
590 return -ERESTARTSYS;
591
592 if (!gspca_dev->present) {
593 ret = -ENODEV;
594 goto out;
595 }
596
597 /* set the higher alternate setting and
598 * loop until urb submit succeeds */
599 gspca_dev->alt = gspca_dev->nbalt;
600 for (;;) {
601 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
602 ep = get_ep(gspca_dev);
603 if (ep == NULL) {
604 ret = -EIO;
605 goto out;
606 }
607 ret = create_urbs(gspca_dev, ep);
608 if (ret < 0)
609 goto out;
610
611 /* clear the bulk endpoint */
612 if (gspca_dev->cam.bulk)
613 usb_clear_halt(gspca_dev->dev,
614 gspca_dev->urb[0]->pipe);
615
616 /* start the cam */
617 ret = gspca_dev->sd_desc->start(gspca_dev);
618 if (ret < 0) {
619 destroy_urbs(gspca_dev);
620 goto out;
621 }
622 gspca_dev->streaming = 1;
623
624 /* some bulk transfers are started by the subdriver */
625 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
626 break;
627
628 /* submit the URBs */
629 for (n = 0; n < gspca_dev->nurbs; n++) {
630 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
631 if (ret < 0) {
632 PDEBUG(D_ERR|D_STREAM,
633 "usb_submit_urb [%d] err %d", n, ret);
634 gspca_dev->streaming = 0;
635 destroy_urbs(gspca_dev);
636 if (ret == -ENOSPC) {
637 msleep(20); /* wait for kill
638 * complete */
639 break; /* try the previous alt */
640 }
641 goto out;
642 }
643 }
644 if (ret >= 0)
645 break;
646 }
647 out:
648 mutex_unlock(&gspca_dev->usb_lock);
649 return ret;
650 }
651
652 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
653 {
654 int ret;
655
656 if (gspca_dev->alt == 0)
657 return 0;
658 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
659 if (ret < 0)
660 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
661 return ret;
662 }
663
664 /* Note: both the queue and the usb locks should be held when calling this */
665 static void gspca_stream_off(struct gspca_dev *gspca_dev)
666 {
667 gspca_dev->streaming = 0;
668 if (gspca_dev->present) {
669 if (gspca_dev->sd_desc->stopN)
670 gspca_dev->sd_desc->stopN(gspca_dev);
671 destroy_urbs(gspca_dev);
672 gspca_set_alt0(gspca_dev);
673 }
674
675 /* always call stop0 to free the subdriver's resources */
676 if (gspca_dev->sd_desc->stop0)
677 gspca_dev->sd_desc->stop0(gspca_dev);
678 PDEBUG(D_STREAM, "stream off OK");
679 }
680
681 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
682 {
683 int i;
684
685 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
686 gspca_dev->curr_mode = i;
687 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
688 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
689 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
690 }
691
692 static int wxh_to_mode(struct gspca_dev *gspca_dev,
693 int width, int height)
694 {
695 int i;
696
697 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
698 if (width >= gspca_dev->cam.cam_mode[i].width
699 && height >= gspca_dev->cam.cam_mode[i].height)
700 break;
701 }
702 return i;
703 }
704
705 /*
706 * search a mode with the right pixel format
707 */
708 static int gspca_get_mode(struct gspca_dev *gspca_dev,
709 int mode,
710 int pixfmt)
711 {
712 int modeU, modeD;
713
714 modeU = modeD = mode;
715 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
716 if (--modeD >= 0) {
717 if (gspca_dev->cam.cam_mode[modeD].pixelformat
718 == pixfmt)
719 return modeD;
720 }
721 if (++modeU < gspca_dev->cam.nmodes) {
722 if (gspca_dev->cam.cam_mode[modeU].pixelformat
723 == pixfmt)
724 return modeU;
725 }
726 }
727 return -EINVAL;
728 }
729
730 #ifdef CONFIG_VIDEO_ADV_DEBUG
731 static int vidioc_g_register(struct file *file, void *priv,
732 struct v4l2_dbg_register *reg)
733 {
734 int ret;
735 struct gspca_dev *gspca_dev = priv;
736
737 if (!gspca_dev->sd_desc->get_chip_ident)
738 return -EINVAL;
739
740 if (!gspca_dev->sd_desc->get_register)
741 return -EINVAL;
742
743 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
744 return -ERESTARTSYS;
745 if (gspca_dev->present)
746 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
747 else
748 ret = -ENODEV;
749 mutex_unlock(&gspca_dev->usb_lock);
750
751 return ret;
752 }
753
754 static int vidioc_s_register(struct file *file, void *priv,
755 struct v4l2_dbg_register *reg)
756 {
757 int ret;
758 struct gspca_dev *gspca_dev = priv;
759
760 if (!gspca_dev->sd_desc->get_chip_ident)
761 return -EINVAL;
762
763 if (!gspca_dev->sd_desc->set_register)
764 return -EINVAL;
765
766 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
767 return -ERESTARTSYS;
768 if (gspca_dev->present)
769 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
770 else
771 ret = -ENODEV;
772 mutex_unlock(&gspca_dev->usb_lock);
773
774 return ret;
775 }
776 #endif
777
778 static int vidioc_g_chip_ident(struct file *file, void *priv,
779 struct v4l2_dbg_chip_ident *chip)
780 {
781 int ret;
782 struct gspca_dev *gspca_dev = priv;
783
784 if (!gspca_dev->sd_desc->get_chip_ident)
785 return -EINVAL;
786
787 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
788 return -ERESTARTSYS;
789 if (gspca_dev->present)
790 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
791 else
792 ret = -ENODEV;
793 mutex_unlock(&gspca_dev->usb_lock);
794
795 return ret;
796 }
797
798 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
799 struct v4l2_fmtdesc *fmtdesc)
800 {
801 struct gspca_dev *gspca_dev = priv;
802 int i, j, index;
803 __u32 fmt_tb[8];
804
805 /* give an index to each format */
806 index = 0;
807 j = 0;
808 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
809 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
810 j = 0;
811 for (;;) {
812 if (fmt_tb[j] == fmt_tb[index])
813 break;
814 j++;
815 }
816 if (j == index) {
817 if (fmtdesc->index == index)
818 break; /* new format */
819 index++;
820 if (index >= ARRAY_SIZE(fmt_tb))
821 return -EINVAL;
822 }
823 }
824 if (i < 0)
825 return -EINVAL; /* no more format */
826
827 fmtdesc->pixelformat = fmt_tb[index];
828 if (gspca_is_compressed(fmt_tb[index]))
829 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
830 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
831 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
832 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
833 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
834 fmtdesc->description[4] = '\0';
835 return 0;
836 }
837
838 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
839 struct v4l2_format *fmt)
840 {
841 struct gspca_dev *gspca_dev = priv;
842 int mode;
843
844 mode = gspca_dev->curr_mode;
845 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
846 sizeof fmt->fmt.pix);
847 return 0;
848 }
849
850 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
851 struct v4l2_format *fmt)
852 {
853 int w, h, mode, mode2;
854
855 w = fmt->fmt.pix.width;
856 h = fmt->fmt.pix.height;
857
858 #ifdef GSPCA_DEBUG
859 if (gspca_debug & D_CONF)
860 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
861 #endif
862 /* search the closest mode for width and height */
863 mode = wxh_to_mode(gspca_dev, w, h);
864
865 /* OK if right palette */
866 if (gspca_dev->cam.cam_mode[mode].pixelformat
867 != fmt->fmt.pix.pixelformat) {
868
869 /* else, search the closest mode with the same pixel format */
870 mode2 = gspca_get_mode(gspca_dev, mode,
871 fmt->fmt.pix.pixelformat);
872 if (mode2 >= 0)
873 mode = mode2;
874 /* else
875 ; * no chance, return this mode */
876 }
877 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
878 sizeof fmt->fmt.pix);
879 return mode; /* used when s_fmt */
880 }
881
882 static int vidioc_try_fmt_vid_cap(struct file *file,
883 void *priv,
884 struct v4l2_format *fmt)
885 {
886 struct gspca_dev *gspca_dev = priv;
887 int ret;
888
889 ret = try_fmt_vid_cap(gspca_dev, fmt);
890 if (ret < 0)
891 return ret;
892 return 0;
893 }
894
895 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
896 struct v4l2_format *fmt)
897 {
898 struct gspca_dev *gspca_dev = priv;
899 int ret;
900
901 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
902 return -ERESTARTSYS;
903
904 ret = try_fmt_vid_cap(gspca_dev, fmt);
905 if (ret < 0)
906 goto out;
907
908 if (gspca_dev->nframes != 0
909 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
910 ret = -EINVAL;
911 goto out;
912 }
913
914 if (ret == gspca_dev->curr_mode) {
915 ret = 0;
916 goto out; /* same mode */
917 }
918
919 if (gspca_dev->streaming) {
920 ret = -EBUSY;
921 goto out;
922 }
923 gspca_dev->width = fmt->fmt.pix.width;
924 gspca_dev->height = fmt->fmt.pix.height;
925 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
926 gspca_dev->curr_mode = ret;
927
928 ret = 0;
929 out:
930 mutex_unlock(&gspca_dev->queue_lock);
931 return ret;
932 }
933
934 static int vidioc_enum_framesizes(struct file *file, void *priv,
935 struct v4l2_frmsizeenum *fsize)
936 {
937 struct gspca_dev *gspca_dev = priv;
938 int i;
939 __u32 index = 0;
940
941 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
942 if (fsize->pixel_format !=
943 gspca_dev->cam.cam_mode[i].pixelformat)
944 continue;
945
946 if (fsize->index == index) {
947 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
948 fsize->discrete.width =
949 gspca_dev->cam.cam_mode[i].width;
950 fsize->discrete.height =
951 gspca_dev->cam.cam_mode[i].height;
952 return 0;
953 }
954 index++;
955 }
956
957 return -EINVAL;
958 }
959
960 static void gspca_release(struct video_device *vfd)
961 {
962 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
963
964 PDEBUG(D_STREAM, "device released");
965
966 kfree(gspca_dev->usb_buf);
967 kfree(gspca_dev);
968 }
969
970 static int dev_open(struct file *file)
971 {
972 struct gspca_dev *gspca_dev;
973 int ret;
974
975 PDEBUG(D_STREAM, "%s open", current->comm);
976 gspca_dev = (struct gspca_dev *) video_devdata(file);
977 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
978 return -ERESTARTSYS;
979 if (!gspca_dev->present) {
980 ret = -ENODEV;
981 goto out;
982 }
983
984 if (gspca_dev->users > 4) { /* (arbitrary value) */
985 ret = -EBUSY;
986 goto out;
987 }
988
989 /* protect the subdriver against rmmod */
990 if (!try_module_get(gspca_dev->module)) {
991 ret = -ENODEV;
992 goto out;
993 }
994
995 gspca_dev->users++;
996
997 file->private_data = gspca_dev;
998 #ifdef GSPCA_DEBUG
999 /* activate the v4l2 debug */
1000 if (gspca_debug & D_V4L2)
1001 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1002 | V4L2_DEBUG_IOCTL_ARG;
1003 else
1004 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1005 | V4L2_DEBUG_IOCTL_ARG);
1006 #endif
1007 ret = 0;
1008 out:
1009 mutex_unlock(&gspca_dev->queue_lock);
1010 if (ret != 0)
1011 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1012 else
1013 PDEBUG(D_STREAM, "open done");
1014 return ret;
1015 }
1016
1017 static int dev_close(struct file *file)
1018 {
1019 struct gspca_dev *gspca_dev = file->private_data;
1020
1021 PDEBUG(D_STREAM, "%s close", current->comm);
1022 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1023 return -ERESTARTSYS;
1024 gspca_dev->users--;
1025
1026 /* if the file did the capture, free the streaming resources */
1027 if (gspca_dev->capt_file == file) {
1028 if (gspca_dev->streaming) {
1029 mutex_lock(&gspca_dev->usb_lock);
1030 gspca_stream_off(gspca_dev);
1031 mutex_unlock(&gspca_dev->usb_lock);
1032 }
1033 frame_free(gspca_dev);
1034 gspca_dev->capt_file = NULL;
1035 gspca_dev->memory = GSPCA_MEMORY_NO;
1036 }
1037 file->private_data = NULL;
1038 module_put(gspca_dev->module);
1039 mutex_unlock(&gspca_dev->queue_lock);
1040
1041 PDEBUG(D_STREAM, "close done");
1042
1043 return 0;
1044 }
1045
1046 static int vidioc_querycap(struct file *file, void *priv,
1047 struct v4l2_capability *cap)
1048 {
1049 struct gspca_dev *gspca_dev = priv;
1050 int ret;
1051
1052 /* protect the access to the usb device */
1053 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1054 return -ERESTARTSYS;
1055 if (!gspca_dev->present) {
1056 ret = -ENODEV;
1057 goto out;
1058 }
1059 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1060 if (gspca_dev->dev->product != NULL) {
1061 strncpy(cap->card, gspca_dev->dev->product,
1062 sizeof cap->card);
1063 } else {
1064 snprintf(cap->card, sizeof cap->card,
1065 "USB Camera (%04x:%04x)",
1066 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1067 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1068 }
1069 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1070 cap->version = DRIVER_VERSION_NUMBER;
1071 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1072 | V4L2_CAP_STREAMING
1073 | V4L2_CAP_READWRITE;
1074 ret = 0;
1075 out:
1076 mutex_unlock(&gspca_dev->usb_lock);
1077 return ret;
1078 }
1079
1080 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1081 int id)
1082 {
1083 const struct ctrl *ctrls;
1084 int i;
1085
1086 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1087 i < gspca_dev->sd_desc->nctrls;
1088 i++, ctrls++) {
1089 if (gspca_dev->ctrl_dis & (1 << i))
1090 continue;
1091 if (id == ctrls->qctrl.id)
1092 return ctrls;
1093 }
1094 return NULL;
1095 }
1096
1097 static int vidioc_queryctrl(struct file *file, void *priv,
1098 struct v4l2_queryctrl *q_ctrl)
1099 {
1100 struct gspca_dev *gspca_dev = priv;
1101 const struct ctrl *ctrls;
1102 int i;
1103 u32 id;
1104
1105 ctrls = NULL;
1106 id = q_ctrl->id;
1107 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1108 id &= V4L2_CTRL_ID_MASK;
1109 id++;
1110 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1111 if (gspca_dev->ctrl_dis & (1 << i))
1112 continue;
1113 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1114 continue;
1115 if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1116 > ctrls->qctrl.id)
1117 continue;
1118 ctrls = &gspca_dev->sd_desc->ctrls[i];
1119 }
1120 } else {
1121 ctrls = get_ctrl(gspca_dev, id);
1122 }
1123 if (ctrls == NULL)
1124 return -EINVAL;
1125 memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1126 return 0;
1127 }
1128
1129 static int vidioc_s_ctrl(struct file *file, void *priv,
1130 struct v4l2_control *ctrl)
1131 {
1132 struct gspca_dev *gspca_dev = priv;
1133 const struct ctrl *ctrls;
1134 int ret;
1135
1136 ctrls = get_ctrl(gspca_dev, ctrl->id);
1137 if (ctrls == NULL)
1138 return -EINVAL;
1139
1140 if (ctrl->value < ctrls->qctrl.minimum
1141 || ctrl->value > ctrls->qctrl.maximum)
1142 return -ERANGE;
1143 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1144 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1145 return -ERESTARTSYS;
1146 if (gspca_dev->present)
1147 ret = ctrls->set(gspca_dev, ctrl->value);
1148 else
1149 ret = -ENODEV;
1150 mutex_unlock(&gspca_dev->usb_lock);
1151 return ret;
1152 }
1153
1154 static int vidioc_g_ctrl(struct file *file, void *priv,
1155 struct v4l2_control *ctrl)
1156 {
1157 struct gspca_dev *gspca_dev = priv;
1158 const struct ctrl *ctrls;
1159 int ret;
1160
1161 ctrls = get_ctrl(gspca_dev, ctrl->id);
1162 if (ctrls == NULL)
1163 return -EINVAL;
1164
1165 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1166 return -ERESTARTSYS;
1167 if (gspca_dev->present)
1168 ret = ctrls->get(gspca_dev, &ctrl->value);
1169 else
1170 ret = -ENODEV;
1171 mutex_unlock(&gspca_dev->usb_lock);
1172 return ret;
1173 }
1174
1175 /*fixme: have an audio flag in gspca_dev?*/
1176 static int vidioc_s_audio(struct file *file, void *priv,
1177 struct v4l2_audio *audio)
1178 {
1179 if (audio->index != 0)
1180 return -EINVAL;
1181 return 0;
1182 }
1183
1184 static int vidioc_g_audio(struct file *file, void *priv,
1185 struct v4l2_audio *audio)
1186 {
1187 strcpy(audio->name, "Microphone");
1188 return 0;
1189 }
1190
1191 static int vidioc_enumaudio(struct file *file, void *priv,
1192 struct v4l2_audio *audio)
1193 {
1194 if (audio->index != 0)
1195 return -EINVAL;
1196
1197 strcpy(audio->name, "Microphone");
1198 audio->capability = 0;
1199 audio->mode = 0;
1200 return 0;
1201 }
1202
1203 static int vidioc_querymenu(struct file *file, void *priv,
1204 struct v4l2_querymenu *qmenu)
1205 {
1206 struct gspca_dev *gspca_dev = priv;
1207
1208 if (!gspca_dev->sd_desc->querymenu)
1209 return -EINVAL;
1210 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1211 }
1212
1213 static int vidioc_enum_input(struct file *file, void *priv,
1214 struct v4l2_input *input)
1215 {
1216 struct gspca_dev *gspca_dev = priv;
1217
1218 if (input->index != 0)
1219 return -EINVAL;
1220 input->type = V4L2_INPUT_TYPE_CAMERA;
1221 input->status = gspca_dev->cam.input_flags;
1222 strncpy(input->name, gspca_dev->sd_desc->name,
1223 sizeof input->name);
1224 return 0;
1225 }
1226
1227 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1228 {
1229 *i = 0;
1230 return 0;
1231 }
1232
1233 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1234 {
1235 if (i > 0)
1236 return -EINVAL;
1237 return (0);
1238 }
1239
1240 static int vidioc_reqbufs(struct file *file, void *priv,
1241 struct v4l2_requestbuffers *rb)
1242 {
1243 struct gspca_dev *gspca_dev = priv;
1244 int i, ret = 0;
1245
1246 switch (rb->memory) {
1247 case GSPCA_MEMORY_READ: /* (internal call) */
1248 case V4L2_MEMORY_MMAP:
1249 case V4L2_MEMORY_USERPTR:
1250 break;
1251 default:
1252 return -EINVAL;
1253 }
1254 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1255 return -ERESTARTSYS;
1256
1257 if (gspca_dev->memory != GSPCA_MEMORY_NO
1258 && gspca_dev->memory != rb->memory) {
1259 ret = -EBUSY;
1260 goto out;
1261 }
1262
1263 /* only one file may do the capture */
1264 if (gspca_dev->capt_file != NULL
1265 && gspca_dev->capt_file != file) {
1266 ret = -EBUSY;
1267 goto out;
1268 }
1269
1270 /* if allocated, the buffers must not be mapped */
1271 for (i = 0; i < gspca_dev->nframes; i++) {
1272 if (gspca_dev->frame[i].vma_use_count) {
1273 ret = -EBUSY;
1274 goto out;
1275 }
1276 }
1277
1278 /* stop streaming */
1279 if (gspca_dev->streaming) {
1280 mutex_lock(&gspca_dev->usb_lock);
1281 gspca_stream_off(gspca_dev);
1282 mutex_unlock(&gspca_dev->usb_lock);
1283 }
1284
1285 /* free the previous allocated buffers, if any */
1286 if (gspca_dev->nframes != 0) {
1287 frame_free(gspca_dev);
1288 gspca_dev->capt_file = NULL;
1289 }
1290 if (rb->count == 0) /* unrequest */
1291 goto out;
1292 gspca_dev->memory = rb->memory;
1293 ret = frame_alloc(gspca_dev, rb->count);
1294 if (ret == 0) {
1295 rb->count = gspca_dev->nframes;
1296 gspca_dev->capt_file = file;
1297 }
1298 out:
1299 mutex_unlock(&gspca_dev->queue_lock);
1300 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1301 return ret;
1302 }
1303
1304 static int vidioc_querybuf(struct file *file, void *priv,
1305 struct v4l2_buffer *v4l2_buf)
1306 {
1307 struct gspca_dev *gspca_dev = priv;
1308 struct gspca_frame *frame;
1309
1310 if (v4l2_buf->index < 0
1311 || v4l2_buf->index >= gspca_dev->nframes)
1312 return -EINVAL;
1313
1314 frame = &gspca_dev->frame[v4l2_buf->index];
1315 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1316 return 0;
1317 }
1318
1319 static int vidioc_streamon(struct file *file, void *priv,
1320 enum v4l2_buf_type buf_type)
1321 {
1322 struct gspca_dev *gspca_dev = priv;
1323 int ret;
1324
1325 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1326 return -EINVAL;
1327 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1328 return -ERESTARTSYS;
1329
1330 if (gspca_dev->nframes == 0
1331 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1332 ret = -EINVAL;
1333 goto out;
1334 }
1335 if (!gspca_dev->streaming) {
1336 ret = gspca_init_transfer(gspca_dev);
1337 if (ret < 0)
1338 goto out;
1339 }
1340 #ifdef GSPCA_DEBUG
1341 if (gspca_debug & D_STREAM) {
1342 PDEBUG_MODE("stream on OK",
1343 gspca_dev->pixfmt,
1344 gspca_dev->width,
1345 gspca_dev->height);
1346 }
1347 #endif
1348 ret = 0;
1349 out:
1350 mutex_unlock(&gspca_dev->queue_lock);
1351 return ret;
1352 }
1353
1354 static int vidioc_streamoff(struct file *file, void *priv,
1355 enum v4l2_buf_type buf_type)
1356 {
1357 struct gspca_dev *gspca_dev = priv;
1358 int i, ret;
1359
1360 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1361 return -EINVAL;
1362 if (!gspca_dev->streaming)
1363 return 0;
1364 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1365 return -ERESTARTSYS;
1366
1367 /* stop streaming */
1368 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1369 ret = -ERESTARTSYS;
1370 goto out;
1371 }
1372 gspca_stream_off(gspca_dev);
1373 mutex_unlock(&gspca_dev->usb_lock);
1374
1375 /* empty the application queues */
1376 for (i = 0; i < gspca_dev->nframes; i++)
1377 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1378 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1379 gspca_dev->last_packet_type = DISCARD_PACKET;
1380 gspca_dev->sequence = 0;
1381 ret = 0;
1382 out:
1383 mutex_unlock(&gspca_dev->queue_lock);
1384 return ret;
1385 }
1386
1387 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1388 struct v4l2_jpegcompression *jpegcomp)
1389 {
1390 struct gspca_dev *gspca_dev = priv;
1391 int ret;
1392
1393 if (!gspca_dev->sd_desc->get_jcomp)
1394 return -EINVAL;
1395 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1396 return -ERESTARTSYS;
1397 if (gspca_dev->present)
1398 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1399 else
1400 ret = -ENODEV;
1401 mutex_unlock(&gspca_dev->usb_lock);
1402 return ret;
1403 }
1404
1405 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1406 struct v4l2_jpegcompression *jpegcomp)
1407 {
1408 struct gspca_dev *gspca_dev = priv;
1409 int ret;
1410
1411 if (!gspca_dev->sd_desc->set_jcomp)
1412 return -EINVAL;
1413 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1414 return -ERESTARTSYS;
1415 if (gspca_dev->present)
1416 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1417 else
1418 ret = -ENODEV;
1419 mutex_unlock(&gspca_dev->usb_lock);
1420 return ret;
1421 }
1422
1423 static int vidioc_g_parm(struct file *filp, void *priv,
1424 struct v4l2_streamparm *parm)
1425 {
1426 struct gspca_dev *gspca_dev = priv;
1427
1428 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1429
1430 if (gspca_dev->sd_desc->get_streamparm) {
1431 int ret;
1432
1433 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1434 return -ERESTARTSYS;
1435 if (gspca_dev->present)
1436 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1437 parm);
1438 else
1439 ret = -ENODEV;
1440 mutex_unlock(&gspca_dev->usb_lock);
1441 return ret;
1442 }
1443
1444 return 0;
1445 }
1446
1447 static int vidioc_s_parm(struct file *filp, void *priv,
1448 struct v4l2_streamparm *parm)
1449 {
1450 struct gspca_dev *gspca_dev = priv;
1451 int n;
1452
1453 n = parm->parm.capture.readbuffers;
1454 if (n == 0 || n > GSPCA_MAX_FRAMES)
1455 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1456 else
1457 gspca_dev->nbufread = n;
1458
1459 if (gspca_dev->sd_desc->set_streamparm) {
1460 int ret;
1461
1462 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1463 return -ERESTARTSYS;
1464 if (gspca_dev->present)
1465 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1466 parm);
1467 else
1468 ret = -ENODEV;
1469 mutex_unlock(&gspca_dev->usb_lock);
1470 return ret;
1471 }
1472
1473 return 0;
1474 }
1475
1476 static int vidioc_s_std(struct file *filp, void *priv,
1477 v4l2_std_id *parm)
1478 {
1479 return 0;
1480 }
1481
1482 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1483 static int vidiocgmbuf(struct file *file, void *priv,
1484 struct video_mbuf *mbuf)
1485 {
1486 struct gspca_dev *gspca_dev = file->private_data;
1487 int i;
1488
1489 PDEBUG(D_STREAM, "cgmbuf");
1490 if (gspca_dev->nframes == 0) {
1491 int ret;
1492
1493 {
1494 struct v4l2_format fmt;
1495
1496 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1497 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1498 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1499 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1500 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1501 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1502 if (ret != 0)
1503 return ret;
1504 }
1505 {
1506 struct v4l2_requestbuffers rb;
1507
1508 memset(&rb, 0, sizeof rb);
1509 rb.count = 4;
1510 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1511 rb.memory = V4L2_MEMORY_MMAP;
1512 ret = vidioc_reqbufs(file, priv, &rb);
1513 if (ret != 0)
1514 return ret;
1515 }
1516 }
1517 mbuf->frames = gspca_dev->nframes;
1518 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1519 for (i = 0; i < mbuf->frames; i++)
1520 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1521 return 0;
1522 }
1523 #endif
1524
1525 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1526 {
1527 struct gspca_dev *gspca_dev = file->private_data;
1528 struct gspca_frame *frame;
1529 struct page *page;
1530 unsigned long addr, start, size;
1531 int i, ret;
1532
1533 start = vma->vm_start;
1534 size = vma->vm_end - vma->vm_start;
1535 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1536
1537 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1538 return -ERESTARTSYS;
1539 if (!gspca_dev->present) {
1540 ret = -ENODEV;
1541 goto out;
1542 }
1543 if (gspca_dev->capt_file != file) {
1544 ret = -EINVAL;
1545 goto out;
1546 }
1547
1548 frame = NULL;
1549 for (i = 0; i < gspca_dev->nframes; ++i) {
1550 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1551 PDEBUG(D_STREAM, "mmap bad memory type");
1552 break;
1553 }
1554 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1555 == vma->vm_pgoff) {
1556 frame = &gspca_dev->frame[i];
1557 break;
1558 }
1559 }
1560 if (frame == NULL) {
1561 PDEBUG(D_STREAM, "mmap no frame buffer found");
1562 ret = -EINVAL;
1563 goto out;
1564 }
1565 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1566 /* v4l1 maps all the buffers */
1567 if (i != 0
1568 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1569 #endif
1570 if (size != frame->v4l2_buf.length) {
1571 PDEBUG(D_STREAM, "mmap bad size");
1572 ret = -EINVAL;
1573 goto out;
1574 }
1575
1576 /*
1577 * - VM_IO marks the area as being a mmaped region for I/O to a
1578 * device. It also prevents the region from being core dumped.
1579 */
1580 vma->vm_flags |= VM_IO;
1581
1582 addr = (unsigned long) frame->data;
1583 while (size > 0) {
1584 page = vmalloc_to_page((void *) addr);
1585 ret = vm_insert_page(vma, start, page);
1586 if (ret < 0)
1587 goto out;
1588 start += PAGE_SIZE;
1589 addr += PAGE_SIZE;
1590 size -= PAGE_SIZE;
1591 }
1592
1593 vma->vm_ops = &gspca_vm_ops;
1594 vma->vm_private_data = frame;
1595 gspca_vm_open(vma);
1596 ret = 0;
1597 out:
1598 mutex_unlock(&gspca_dev->queue_lock);
1599 return ret;
1600 }
1601
1602 /*
1603 * wait for a video frame
1604 *
1605 * If a frame is ready, its index is returned.
1606 */
1607 static int frame_wait(struct gspca_dev *gspca_dev,
1608 int nonblock_ing)
1609 {
1610 struct gspca_frame *frame;
1611 int i, j, ret;
1612
1613 /* check if a frame is ready */
1614 i = gspca_dev->fr_o;
1615 j = gspca_dev->fr_queue[i];
1616 frame = &gspca_dev->frame[j];
1617
1618 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1619 if (nonblock_ing)
1620 return -EAGAIN;
1621
1622 /* wait till a frame is ready */
1623 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1624 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1625 !gspca_dev->streaming || !gspca_dev->present,
1626 msecs_to_jiffies(3000));
1627 if (ret < 0)
1628 return ret;
1629 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1630 return -EIO;
1631 }
1632
1633 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1634 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1635 gspca_dev->fr_q,
1636 gspca_dev->fr_i,
1637 gspca_dev->fr_o);
1638
1639 if (gspca_dev->sd_desc->dq_callback) {
1640 mutex_lock(&gspca_dev->usb_lock);
1641 if (gspca_dev->present)
1642 gspca_dev->sd_desc->dq_callback(gspca_dev);
1643 mutex_unlock(&gspca_dev->usb_lock);
1644 }
1645 return j;
1646 }
1647
1648 /*
1649 * dequeue a video buffer
1650 *
1651 * If nonblock_ing is false, block until a buffer is available.
1652 */
1653 static int vidioc_dqbuf(struct file *file, void *priv,
1654 struct v4l2_buffer *v4l2_buf)
1655 {
1656 struct gspca_dev *gspca_dev = priv;
1657 struct gspca_frame *frame;
1658 int i, ret;
1659
1660 PDEBUG(D_FRAM, "dqbuf");
1661 if (v4l2_buf->memory != gspca_dev->memory)
1662 return -EINVAL;
1663
1664 if (!gspca_dev->present)
1665 return -ENODEV;
1666
1667 /* if not streaming, be sure the application will not loop forever */
1668 if (!(file->f_flags & O_NONBLOCK)
1669 && !gspca_dev->streaming && gspca_dev->users == 1)
1670 return -EINVAL;
1671
1672 /* only the capturing file may dequeue */
1673 if (gspca_dev->capt_file != file)
1674 return -EINVAL;
1675
1676 /* only one dequeue / read at a time */
1677 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1678 return -ERESTARTSYS;
1679
1680 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1681 if (ret < 0)
1682 goto out;
1683 i = ret; /* frame index */
1684 frame = &gspca_dev->frame[i];
1685 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1686 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1687 frame->data,
1688 frame->v4l2_buf.bytesused)) {
1689 PDEBUG(D_ERR|D_STREAM,
1690 "dqbuf cp to user failed");
1691 ret = -EFAULT;
1692 goto out;
1693 }
1694 }
1695 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1696 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1697 PDEBUG(D_FRAM, "dqbuf %d", i);
1698 ret = 0;
1699 out:
1700 mutex_unlock(&gspca_dev->read_lock);
1701 return ret;
1702 }
1703
1704 /*
1705 * queue a video buffer
1706 *
1707 * Attempting to queue a buffer that has already been
1708 * queued will return -EINVAL.
1709 */
1710 static int vidioc_qbuf(struct file *file, void *priv,
1711 struct v4l2_buffer *v4l2_buf)
1712 {
1713 struct gspca_dev *gspca_dev = priv;
1714 struct gspca_frame *frame;
1715 int i, index, ret;
1716
1717 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1718
1719 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1720 return -ERESTARTSYS;
1721
1722 index = v4l2_buf->index;
1723 if ((unsigned) index >= gspca_dev->nframes) {
1724 PDEBUG(D_FRAM,
1725 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1726 ret = -EINVAL;
1727 goto out;
1728 }
1729 if (v4l2_buf->memory != gspca_dev->memory) {
1730 PDEBUG(D_FRAM, "qbuf bad memory type");
1731 ret = -EINVAL;
1732 goto out;
1733 }
1734
1735 frame = &gspca_dev->frame[index];
1736 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1737 PDEBUG(D_FRAM, "qbuf bad state");
1738 ret = -EINVAL;
1739 goto out;
1740 }
1741
1742 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1743
1744 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1745 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1746 frame->v4l2_buf.length = v4l2_buf->length;
1747 }
1748
1749 /* put the buffer in the 'queued' queue */
1750 i = gspca_dev->fr_q;
1751 gspca_dev->fr_queue[i] = index;
1752 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1753 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1754 gspca_dev->fr_q,
1755 gspca_dev->fr_i,
1756 gspca_dev->fr_o);
1757
1758 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1759 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1760 ret = 0;
1761 out:
1762 mutex_unlock(&gspca_dev->queue_lock);
1763 return ret;
1764 }
1765
1766 /*
1767 * allocate the resources for read()
1768 */
1769 static int read_alloc(struct gspca_dev *gspca_dev,
1770 struct file *file)
1771 {
1772 struct v4l2_buffer v4l2_buf;
1773 int i, ret;
1774
1775 PDEBUG(D_STREAM, "read alloc");
1776 if (gspca_dev->nframes == 0) {
1777 struct v4l2_requestbuffers rb;
1778
1779 memset(&rb, 0, sizeof rb);
1780 rb.count = gspca_dev->nbufread;
1781 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1782 rb.memory = GSPCA_MEMORY_READ;
1783 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1784 if (ret != 0) {
1785 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1786 return ret;
1787 }
1788 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1789 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1790 v4l2_buf.memory = GSPCA_MEMORY_READ;
1791 for (i = 0; i < gspca_dev->nbufread; i++) {
1792 v4l2_buf.index = i;
1793 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1794 if (ret != 0) {
1795 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1796 return ret;
1797 }
1798 }
1799 gspca_dev->memory = GSPCA_MEMORY_READ;
1800 }
1801
1802 /* start streaming */
1803 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1804 if (ret != 0)
1805 PDEBUG(D_STREAM, "read streamon err %d", ret);
1806 return ret;
1807 }
1808
1809 static unsigned int dev_poll(struct file *file, poll_table *wait)
1810 {
1811 struct gspca_dev *gspca_dev = file->private_data;
1812 int i, ret;
1813
1814 PDEBUG(D_FRAM, "poll");
1815
1816 poll_wait(file, &gspca_dev->wq, wait);
1817
1818 /* if reqbufs is not done, the user would use read() */
1819 if (gspca_dev->nframes == 0) {
1820 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1821 return POLLERR; /* not the 1st time */
1822 ret = read_alloc(gspca_dev, file);
1823 if (ret != 0)
1824 return POLLERR;
1825 }
1826
1827 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1828 return POLLERR;
1829
1830 /* check the next incoming buffer */
1831 i = gspca_dev->fr_o;
1832 i = gspca_dev->fr_queue[i];
1833 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1834 ret = POLLIN | POLLRDNORM; /* something to read */
1835 else
1836 ret = 0;
1837 mutex_unlock(&gspca_dev->queue_lock);
1838 if (!gspca_dev->present)
1839 return POLLHUP;
1840 return ret;
1841 }
1842
1843 static ssize_t dev_read(struct file *file, char __user *data,
1844 size_t count, loff_t *ppos)
1845 {
1846 struct gspca_dev *gspca_dev = file->private_data;
1847 struct gspca_frame *frame;
1848 struct v4l2_buffer v4l2_buf;
1849 struct timeval timestamp;
1850 int n, ret, ret2;
1851
1852 PDEBUG(D_FRAM, "read (%zd)", count);
1853 if (!gspca_dev->present)
1854 return -ENODEV;
1855 switch (gspca_dev->memory) {
1856 case GSPCA_MEMORY_NO: /* first time */
1857 ret = read_alloc(gspca_dev, file);
1858 if (ret != 0)
1859 return ret;
1860 break;
1861 case GSPCA_MEMORY_READ:
1862 if (gspca_dev->capt_file == file)
1863 break;
1864 /* fall thru */
1865 default:
1866 return -EINVAL;
1867 }
1868
1869 /* get a frame */
1870 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1871 timestamp.tv_sec--;
1872 n = 2;
1873 for (;;) {
1874 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1875 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1876 v4l2_buf.memory = GSPCA_MEMORY_READ;
1877 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1878 if (ret != 0) {
1879 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1880 return ret;
1881 }
1882
1883 /* if the process slept for more than 1 second,
1884 * get a newer frame */
1885 frame = &gspca_dev->frame[v4l2_buf.index];
1886 if (--n < 0)
1887 break; /* avoid infinite loop */
1888 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1889 break;
1890 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1891 if (ret != 0) {
1892 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1893 return ret;
1894 }
1895 }
1896
1897 /* copy the frame */
1898 if (count > frame->v4l2_buf.bytesused)
1899 count = frame->v4l2_buf.bytesused;
1900 ret = copy_to_user(data, frame->data, count);
1901 if (ret != 0) {
1902 PDEBUG(D_ERR|D_STREAM,
1903 "read cp to user lack %d / %zd", ret, count);
1904 ret = -EFAULT;
1905 goto out;
1906 }
1907 ret = count;
1908 out:
1909 /* in each case, requeue the buffer */
1910 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1911 if (ret2 != 0)
1912 return ret2;
1913 return ret;
1914 }
1915
1916 static struct v4l2_file_operations dev_fops = {
1917 .owner = THIS_MODULE,
1918 .open = dev_open,
1919 .release = dev_close,
1920 .read = dev_read,
1921 .mmap = dev_mmap,
1922 .unlocked_ioctl = video_ioctl2,
1923 .poll = dev_poll,
1924 };
1925
1926 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1927 .vidioc_querycap = vidioc_querycap,
1928 .vidioc_dqbuf = vidioc_dqbuf,
1929 .vidioc_qbuf = vidioc_qbuf,
1930 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1931 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1932 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1933 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1934 .vidioc_streamon = vidioc_streamon,
1935 .vidioc_queryctrl = vidioc_queryctrl,
1936 .vidioc_g_ctrl = vidioc_g_ctrl,
1937 .vidioc_s_ctrl = vidioc_s_ctrl,
1938 .vidioc_g_audio = vidioc_g_audio,
1939 .vidioc_s_audio = vidioc_s_audio,
1940 .vidioc_enumaudio = vidioc_enumaudio,
1941 .vidioc_querymenu = vidioc_querymenu,
1942 .vidioc_enum_input = vidioc_enum_input,
1943 .vidioc_g_input = vidioc_g_input,
1944 .vidioc_s_input = vidioc_s_input,
1945 .vidioc_reqbufs = vidioc_reqbufs,
1946 .vidioc_querybuf = vidioc_querybuf,
1947 .vidioc_streamoff = vidioc_streamoff,
1948 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1949 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1950 .vidioc_g_parm = vidioc_g_parm,
1951 .vidioc_s_parm = vidioc_s_parm,
1952 .vidioc_s_std = vidioc_s_std,
1953 .vidioc_enum_framesizes = vidioc_enum_framesizes,
1954 #ifdef CONFIG_VIDEO_ADV_DEBUG
1955 .vidioc_g_register = vidioc_g_register,
1956 .vidioc_s_register = vidioc_s_register,
1957 #endif
1958 .vidioc_g_chip_ident = vidioc_g_chip_ident,
1959 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1960 .vidiocgmbuf = vidiocgmbuf,
1961 #endif
1962 };
1963
1964 static struct video_device gspca_template = {
1965 .name = "gspca main driver",
1966 .fops = &dev_fops,
1967 .ioctl_ops = &dev_ioctl_ops,
1968 .release = gspca_release,
1969 .minor = -1,
1970 };
1971
1972 /*
1973 * probe and create a new gspca device
1974 *
1975 * This function must be called by the sub-driver when it is
1976 * called for probing a new device.
1977 */
1978 int gspca_dev_probe(struct usb_interface *intf,
1979 const struct usb_device_id *id,
1980 const struct sd_desc *sd_desc,
1981 int dev_size,
1982 struct module *module)
1983 {
1984 struct usb_interface_descriptor *interface;
1985 struct gspca_dev *gspca_dev;
1986 struct usb_device *dev = interface_to_usbdev(intf);
1987 int ret;
1988
1989 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1990
1991 /* we don't handle multi-config cameras */
1992 if (dev->descriptor.bNumConfigurations != 1)
1993 return -ENODEV;
1994 interface = &intf->cur_altsetting->desc;
1995 if (interface->bInterfaceNumber > 0)
1996 return -ENODEV;
1997
1998 /* create the device */
1999 if (dev_size < sizeof *gspca_dev)
2000 dev_size = sizeof *gspca_dev;
2001 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2002 if (!gspca_dev) {
2003 err("couldn't kzalloc gspca struct");
2004 return -ENOMEM;
2005 }
2006 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2007 if (!gspca_dev->usb_buf) {
2008 err("out of memory");
2009 ret = -ENOMEM;
2010 goto out;
2011 }
2012 gspca_dev->dev = dev;
2013 gspca_dev->iface = interface->bInterfaceNumber;
2014 gspca_dev->nbalt = intf->num_altsetting;
2015 gspca_dev->sd_desc = sd_desc;
2016 gspca_dev->nbufread = 2;
2017 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2018
2019 /* configure the subdriver and initialize the USB device */
2020 ret = sd_desc->config(gspca_dev, id);
2021 if (ret < 0)
2022 goto out;
2023 ret = sd_desc->init(gspca_dev);
2024 if (ret < 0)
2025 goto out;
2026 ret = gspca_set_alt0(gspca_dev);
2027 if (ret < 0)
2028 goto out;
2029 gspca_set_default_mode(gspca_dev);
2030
2031 mutex_init(&gspca_dev->usb_lock);
2032 mutex_init(&gspca_dev->read_lock);
2033 mutex_init(&gspca_dev->queue_lock);
2034 init_waitqueue_head(&gspca_dev->wq);
2035
2036 /* init video stuff */
2037 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2038 gspca_dev->vdev.parent = &intf->dev;
2039 gspca_dev->module = module;
2040 gspca_dev->present = 1;
2041 ret = video_register_device(&gspca_dev->vdev,
2042 VFL_TYPE_GRABBER,
2043 -1);
2044 if (ret < 0) {
2045 err("video_register_device err %d", ret);
2046 goto out;
2047 }
2048
2049 usb_set_intfdata(intf, gspca_dev);
2050 PDEBUG(D_PROBE, "probe ok");
2051 return 0;
2052 out:
2053 kfree(gspca_dev->usb_buf);
2054 kfree(gspca_dev);
2055 return ret;
2056 }
2057 EXPORT_SYMBOL(gspca_dev_probe);
2058
2059 /*
2060 * USB disconnection
2061 *
2062 * This function must be called by the sub-driver
2063 * when the device disconnects, after the specific resources are freed.
2064 */
2065 void gspca_disconnect(struct usb_interface *intf)
2066 {
2067 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2068
2069 mutex_lock(&gspca_dev->usb_lock);
2070 gspca_dev->present = 0;
2071
2072 if (gspca_dev->streaming) {
2073 destroy_urbs(gspca_dev);
2074 wake_up_interruptible(&gspca_dev->wq);
2075 }
2076
2077 /* the device is freed at exit of this function */
2078 gspca_dev->dev = NULL;
2079 mutex_unlock(&gspca_dev->usb_lock);
2080
2081 usb_set_intfdata(intf, NULL);
2082
2083 /* release the device */
2084 /* (this will call gspca_release() immediatly or on last close) */
2085 video_unregister_device(&gspca_dev->vdev);
2086
2087 PDEBUG(D_PROBE, "disconnect complete");
2088 }
2089 EXPORT_SYMBOL(gspca_disconnect);
2090
2091 #ifdef CONFIG_PM
2092 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2093 {
2094 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2095
2096 if (!gspca_dev->streaming)
2097 return 0;
2098 gspca_dev->frozen = 1; /* avoid urb error messages */
2099 if (gspca_dev->sd_desc->stopN)
2100 gspca_dev->sd_desc->stopN(gspca_dev);
2101 destroy_urbs(gspca_dev);
2102 gspca_set_alt0(gspca_dev);
2103 if (gspca_dev->sd_desc->stop0)
2104 gspca_dev->sd_desc->stop0(gspca_dev);
2105 return 0;
2106 }
2107 EXPORT_SYMBOL(gspca_suspend);
2108
2109 int gspca_resume(struct usb_interface *intf)
2110 {
2111 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2112
2113 gspca_dev->frozen = 0;
2114 gspca_dev->sd_desc->init(gspca_dev);
2115 if (gspca_dev->streaming)
2116 return gspca_init_transfer(gspca_dev);
2117 return 0;
2118 }
2119 EXPORT_SYMBOL(gspca_resume);
2120 #endif
2121 /* -- cam driver utility functions -- */
2122
2123 /* auto gain and exposure algorithm based on the knee algorithm described here:
2124 http://ytse.tricolour.net/docs/LowLightOptimization.html
2125
2126 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2127 where changed. */
2128 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2129 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2130 {
2131 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2132 const struct ctrl *gain_ctrl = NULL;
2133 const struct ctrl *exposure_ctrl = NULL;
2134 const struct ctrl *autogain_ctrl = NULL;
2135 int retval = 0;
2136
2137 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2138 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2139 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2140 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2141 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2142 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2143 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2144 }
2145 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2146 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2147 "on cam without (auto)gain/exposure");
2148 return 0;
2149 }
2150
2151 if (gain_ctrl->get(gspca_dev, &gain) ||
2152 exposure_ctrl->get(gspca_dev, &exposure) ||
2153 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2154 return 0;
2155
2156 orig_gain = gain;
2157 orig_exposure = exposure;
2158
2159 /* If we are of a multiple of deadzone, do multiple steps to reach the
2160 desired lumination fast (with the risc of a slight overshoot) */
2161 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2162
2163 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2164 avg_lum, desired_avg_lum, steps);
2165
2166 for (i = 0; i < steps; i++) {
2167 if (avg_lum > desired_avg_lum) {
2168 if (gain > gain_knee)
2169 gain--;
2170 else if (exposure > exposure_knee)
2171 exposure--;
2172 else if (gain > gain_ctrl->qctrl.default_value)
2173 gain--;
2174 else if (exposure > exposure_ctrl->qctrl.minimum)
2175 exposure--;
2176 else if (gain > gain_ctrl->qctrl.minimum)
2177 gain--;
2178 else
2179 break;
2180 } else {
2181 if (gain < gain_ctrl->qctrl.default_value)
2182 gain++;
2183 else if (exposure < exposure_knee)
2184 exposure++;
2185 else if (gain < gain_knee)
2186 gain++;
2187 else if (exposure < exposure_ctrl->qctrl.maximum)
2188 exposure++;
2189 else if (gain < gain_ctrl->qctrl.maximum)
2190 gain++;
2191 else
2192 break;
2193 }
2194 }
2195
2196 if (gain != orig_gain) {
2197 gain_ctrl->set(gspca_dev, gain);
2198 retval = 1;
2199 }
2200 if (exposure != orig_exposure) {
2201 exposure_ctrl->set(gspca_dev, exposure);
2202 retval = 1;
2203 }
2204
2205 return retval;
2206 }
2207 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2208
2209 /* -- module insert / remove -- */
2210 static int __init gspca_init(void)
2211 {
2212 info("main v%d.%d.%d registered",
2213 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2214 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2215 DRIVER_VERSION_NUMBER & 0xff);
2216 return 0;
2217 }
2218 static void __exit gspca_exit(void)
2219 {
2220 info("main deregistered");
2221 }
2222
2223 module_init(gspca_init);
2224 module_exit(gspca_exit);
2225
2226 #ifdef GSPCA_DEBUG
2227 module_param_named(debug, gspca_debug, int, 0644);
2228 MODULE_PARM_DESC(debug,
2229 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2230 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2231 " 0x0100: v4l2");
2232 #endif
Linux kernel - Deliverables
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