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V4L/DVB (9706): gspca: Use the ref counting of v4l2 for disconnection.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / gspca / gspca.c
blob0d233c7248750e6d2ee2e336c7eb32ea4603daef
1 /*
2 * Main USB camera driver
3 *
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
37
38 #include "gspca.h"
39
40 /* global values */
41 #define DEF_NURBS 2 /* default number of URBs */
42
43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
45 MODULE_LICENSE("GPL");
46
47 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 4, 0)
48
49 static int video_nr = -1;
50
51 #ifdef GSPCA_DEBUG
52 int gspca_debug = D_ERR | D_PROBE;
53 EXPORT_SYMBOL(gspca_debug);
54
55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
56 {
57 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
58 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
59 txt,
60 pixfmt & 0xff,
61 (pixfmt >> 8) & 0xff,
62 (pixfmt >> 16) & 0xff,
63 pixfmt >> 24,
64 w, h);
65 } else {
66 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
67 txt,
68 pixfmt,
69 w, h);
70 }
71 }
72 #else
73 #define PDEBUG_MODE(txt, pixfmt, w, h)
74 #endif
75
76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
77 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
78 #define GSPCA_MEMORY_READ 7
79
80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
81
82 /*
83 * VMA operations.
84 */
85 static void gspca_vm_open(struct vm_area_struct *vma)
86 {
87 struct gspca_frame *frame = vma->vm_private_data;
88
89 frame->vma_use_count++;
90 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
91 }
92
93 static void gspca_vm_close(struct vm_area_struct *vma)
94 {
95 struct gspca_frame *frame = vma->vm_private_data;
96
97 if (--frame->vma_use_count <= 0)
98 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
99 }
100
101 static struct vm_operations_struct gspca_vm_ops = {
102 .open = gspca_vm_open,
103 .close = gspca_vm_close,
104 };
105
106 /* get the current input frame buffer */
107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
108 {
109 struct gspca_frame *frame;
110 int i;
111
112 i = gspca_dev->fr_i;
113 i = gspca_dev->fr_queue[i];
114 frame = &gspca_dev->frame[i];
115 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
116 != V4L2_BUF_FLAG_QUEUED)
117 return NULL;
118 return frame;
119 }
120 EXPORT_SYMBOL(gspca_get_i_frame);
121
122 /*
123 * fill a video frame from an URB and resubmit
124 */
125 static void fill_frame(struct gspca_dev *gspca_dev,
126 struct urb *urb)
127 {
128 struct gspca_frame *frame;
129 __u8 *data; /* address of data in the iso message */
130 int i, len, st;
131 cam_pkt_op pkt_scan;
132
133 if (urb->status != 0) {
134 #ifdef CONFIG_PM
135 if (!gspca_dev->frozen)
136 #endif
137 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
138 return; /* disconnection ? */
139 }
140 pkt_scan = gspca_dev->sd_desc->pkt_scan;
141 for (i = 0; i < urb->number_of_packets; i++) {
142
143 /* check the availability of the frame buffer */
144 frame = gspca_get_i_frame(gspca_dev);
145 if (!frame) {
146 gspca_dev->last_packet_type = DISCARD_PACKET;
147 break;
148 }
149
150 /* check the packet status and length */
151 len = urb->iso_frame_desc[i].actual_length;
152 if (len == 0) {
153 if (gspca_dev->empty_packet == 0)
154 gspca_dev->empty_packet = 1;
155 continue;
156 }
157 st = urb->iso_frame_desc[i].status;
158 if (st) {
159 PDEBUG(D_ERR,
160 "ISOC data error: [%d] len=%d, status=%d",
161 i, len, st);
162 gspca_dev->last_packet_type = DISCARD_PACKET;
163 continue;
164 }
165
166 /* let the packet be analyzed by the subdriver */
167 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
168 i, urb->iso_frame_desc[i].offset, len);
169 data = (__u8 *) urb->transfer_buffer
170 + urb->iso_frame_desc[i].offset;
171 pkt_scan(gspca_dev, frame, data, len);
172 }
173
174 /* resubmit the URB */
175 st = usb_submit_urb(urb, GFP_ATOMIC);
176 if (st < 0)
177 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
178 }
179
180 /*
181 * ISOC message interrupt from the USB device
182 *
183 * Analyse each packet and call the subdriver for copy to the frame buffer.
184 */
185 static void isoc_irq(struct urb *urb
186 )
187 {
188 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
189
190 PDEBUG(D_PACK, "isoc irq");
191 if (!gspca_dev->streaming)
192 return;
193 fill_frame(gspca_dev, urb);
194 }
195
196 /*
197 * bulk message interrupt from the USB device
198 */
199 static void bulk_irq(struct urb *urb
200 )
201 {
202 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
203 struct gspca_frame *frame;
204 int st;
205
206 PDEBUG(D_PACK, "bulk irq");
207 if (!gspca_dev->streaming)
208 return;
209 switch (urb->status) {
210 case 0:
211 break;
212 case -ECONNRESET:
213 urb->status = 0;
214 break;
215 default:
216 #ifdef CONFIG_PM
217 if (!gspca_dev->frozen)
218 #endif
219 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
220 return; /* disconnection ? */
221 }
222
223 /* check the availability of the frame buffer */
224 frame = gspca_get_i_frame(gspca_dev);
225 if (!frame) {
226 gspca_dev->last_packet_type = DISCARD_PACKET;
227 } else {
228 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
229 gspca_dev->sd_desc->pkt_scan(gspca_dev,
230 frame,
231 urb->transfer_buffer,
232 urb->actual_length);
233 }
234
235 /* resubmit the URB */
236 if (gspca_dev->cam.bulk_nurbs != 0) {
237 st = usb_submit_urb(urb, GFP_ATOMIC);
238 if (st < 0)
239 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
240 }
241 }
242
243 /*
244 * add data to the current frame
245 *
246 * This function is called by the subdrivers at interrupt level.
247 *
248 * To build a frame, these ones must add
249 * - one FIRST_PACKET
250 * - 0 or many INTER_PACKETs
251 * - one LAST_PACKET
252 * DISCARD_PACKET invalidates the whole frame.
253 * On LAST_PACKET, a new frame is returned.
254 */
255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
256 enum gspca_packet_type packet_type,
257 struct gspca_frame *frame,
258 const __u8 *data,
259 int len)
260 {
261 int i, j;
262
263 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
264
265 /* when start of a new frame, if the current frame buffer
266 * is not queued, discard the whole frame */
267 if (packet_type == FIRST_PACKET) {
268 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
269 != V4L2_BUF_FLAG_QUEUED) {
270 gspca_dev->last_packet_type = DISCARD_PACKET;
271 return frame;
272 }
273 frame->data_end = frame->data;
274 jiffies_to_timeval(get_jiffies_64(),
275 &frame->v4l2_buf.timestamp);
276 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
277 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
278 if (packet_type == LAST_PACKET)
279 gspca_dev->last_packet_type = packet_type;
280 return frame;
281 }
282
283 /* append the packet to the frame buffer */
284 if (len > 0) {
285 if (frame->data_end - frame->data + len
286 > frame->v4l2_buf.length) {
287 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
288 frame->data_end - frame->data + len,
289 frame->v4l2_buf.length);
290 packet_type = DISCARD_PACKET;
291 } else {
292 memcpy(frame->data_end, data, len);
293 frame->data_end += len;
294 }
295 }
296 gspca_dev->last_packet_type = packet_type;
297
298 /* if last packet, wake up the application and advance in the queue */
299 if (packet_type == LAST_PACKET) {
300 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
301 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
302 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
303 atomic_inc(&gspca_dev->nevent);
304 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
305 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
306 gspca_dev->fr_i = i;
307 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
308 frame->v4l2_buf.bytesused,
309 gspca_dev->fr_q,
310 i,
311 gspca_dev->fr_o);
312 j = gspca_dev->fr_queue[i];
313 frame = &gspca_dev->frame[j];
314 }
315 return frame;
316 }
317 EXPORT_SYMBOL(gspca_frame_add);
318
319 static int gspca_is_compressed(__u32 format)
320 {
321 switch (format) {
322 case V4L2_PIX_FMT_MJPEG:
323 case V4L2_PIX_FMT_JPEG:
324 case V4L2_PIX_FMT_SPCA561:
325 case V4L2_PIX_FMT_PAC207:
326 return 1;
327 }
328 return 0;
329 }
330
331 static void *rvmalloc(unsigned long size)
332 {
333 void *mem;
334 unsigned long adr;
335
336 mem = vmalloc_32(size);
337 if (mem != NULL) {
338 adr = (unsigned long) mem;
339 while ((long) size > 0) {
340 SetPageReserved(vmalloc_to_page((void *) adr));
341 adr += PAGE_SIZE;
342 size -= PAGE_SIZE;
343 }
344 }
345 return mem;
346 }
347
348 static void rvfree(void *mem, long size)
349 {
350 unsigned long adr;
351
352 adr = (unsigned long) mem;
353 while (size > 0) {
354 ClearPageReserved(vmalloc_to_page((void *) adr));
355 adr += PAGE_SIZE;
356 size -= PAGE_SIZE;
357 }
358 vfree(mem);
359 }
360
361 static int frame_alloc(struct gspca_dev *gspca_dev,
362 unsigned int count)
363 {
364 struct gspca_frame *frame;
365 unsigned int frsz;
366 int i;
367
368 i = gspca_dev->curr_mode;
369 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
370 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
371 frsz = PAGE_ALIGN(frsz);
372 gspca_dev->frsz = frsz;
373 if (count > GSPCA_MAX_FRAMES)
374 count = GSPCA_MAX_FRAMES;
375 gspca_dev->frbuf = rvmalloc(frsz * count);
376 if (!gspca_dev->frbuf) {
377 err("frame alloc failed");
378 return -ENOMEM;
379 }
380 gspca_dev->nframes = count;
381 for (i = 0; i < count; i++) {
382 frame = &gspca_dev->frame[i];
383 frame->v4l2_buf.index = i;
384 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
385 frame->v4l2_buf.flags = 0;
386 frame->v4l2_buf.field = V4L2_FIELD_NONE;
387 frame->v4l2_buf.length = frsz;
388 frame->v4l2_buf.memory = gspca_dev->memory;
389 frame->v4l2_buf.sequence = 0;
390 frame->data = frame->data_end =
391 gspca_dev->frbuf + i * frsz;
392 frame->v4l2_buf.m.offset = i * frsz;
393 }
394 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
395 gspca_dev->last_packet_type = DISCARD_PACKET;
396 gspca_dev->sequence = 0;
397 atomic_set(&gspca_dev->nevent, 0);
398 return 0;
399 }
400
401 static void frame_free(struct gspca_dev *gspca_dev)
402 {
403 int i;
404
405 PDEBUG(D_STREAM, "frame free");
406 if (gspca_dev->frbuf != NULL) {
407 rvfree(gspca_dev->frbuf,
408 gspca_dev->nframes * gspca_dev->frsz);
409 gspca_dev->frbuf = NULL;
410 for (i = 0; i < gspca_dev->nframes; i++)
411 gspca_dev->frame[i].data = NULL;
412 }
413 gspca_dev->nframes = 0;
414 }
415
416 static void destroy_urbs(struct gspca_dev *gspca_dev)
417 {
418 struct urb *urb;
419 unsigned int i;
420
421 PDEBUG(D_STREAM, "kill transfer");
422 for (i = 0; i < MAX_NURBS; i++) {
423 urb = gspca_dev->urb[i];
424 if (urb == NULL)
425 break;
426
427 gspca_dev->urb[i] = NULL;
428 usb_kill_urb(urb);
429 if (urb->transfer_buffer != NULL)
430 usb_buffer_free(gspca_dev->dev,
431 urb->transfer_buffer_length,
432 urb->transfer_buffer,
433 urb->transfer_dma);
434 usb_free_urb(urb);
435 }
436 }
437
438 /*
439 * look for an input transfer endpoint in an alternate setting
440 */
441 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
442 __u8 epaddr,
443 __u8 xfer)
444 {
445 struct usb_host_endpoint *ep;
446 int i, attr;
447
448 epaddr |= USB_DIR_IN;
449 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
450 ep = &alt->endpoint[i];
451 if (ep->desc.bEndpointAddress == epaddr) {
452 attr = ep->desc.bmAttributes
453 & USB_ENDPOINT_XFERTYPE_MASK;
454 if (attr == xfer)
455 return ep;
456 break;
457 }
458 }
459 return NULL;
460 }
461
462 /*
463 * look for an input (isoc or bulk) endpoint
464 *
465 * The endpoint is defined by the subdriver.
466 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
467 * This routine may be called many times when the bandwidth is too small
468 * (the bandwidth is checked on urb submit).
469 */
470 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
471 {
472 struct usb_interface *intf;
473 struct usb_host_endpoint *ep;
474 int i, ret;
475
476 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
477 ep = NULL;
478 i = gspca_dev->alt; /* previous alt setting */
479
480 /* try isoc */
481 while (--i > 0) { /* alt 0 is unusable */
482 ep = alt_xfer(&intf->altsetting[i],
483 gspca_dev->cam.epaddr,
484 USB_ENDPOINT_XFER_ISOC);
485 if (ep)
486 break;
487 }
488
489 /* if no isoc, try bulk */
490 if (ep == NULL) {
491 ep = alt_xfer(&intf->altsetting[0],
492 gspca_dev->cam.epaddr,
493 USB_ENDPOINT_XFER_BULK);
494 if (ep == NULL) {
495 err("no transfer endpoint found");
496 return NULL;
497 }
498 }
499 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
500 i, ep->desc.bEndpointAddress);
501 if (i > 0) {
502 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
503 if (ret < 0) {
504 err("set interface err %d", ret);
505 return NULL;
506 }
507 }
508 gspca_dev->alt = i; /* memorize the current alt setting */
509 return ep;
510 }
511
512 /*
513 * create the URBs for image transfer
514 */
515 static int create_urbs(struct gspca_dev *gspca_dev,
516 struct usb_host_endpoint *ep)
517 {
518 struct urb *urb;
519 int n, nurbs, i, psize, npkt, bsize;
520
521 /* calculate the packet size and the number of packets */
522 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
523
524 if (gspca_dev->alt != 0) { /* isoc */
525
526 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
527 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
528 npkt = ISO_MAX_SIZE / psize;
529 if (npkt > ISO_MAX_PKT)
530 npkt = ISO_MAX_PKT;
531 bsize = psize * npkt;
532 PDEBUG(D_STREAM,
533 "isoc %d pkts size %d = bsize:%d",
534 npkt, psize, bsize);
535 nurbs = DEF_NURBS;
536 } else { /* bulk */
537 npkt = 0;
538 bsize = gspca_dev->cam.bulk_size;
539 if (bsize == 0)
540 bsize = psize;
541 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
542 if (gspca_dev->cam.bulk_nurbs != 0)
543 nurbs = gspca_dev->cam.bulk_nurbs;
544 else
545 nurbs = 1;
546 }
547
548 gspca_dev->nurbs = nurbs;
549 for (n = 0; n < nurbs; n++) {
550 urb = usb_alloc_urb(npkt, GFP_KERNEL);
551 if (!urb) {
552 err("usb_alloc_urb failed");
553 destroy_urbs(gspca_dev);
554 return -ENOMEM;
555 }
556 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
557 bsize,
558 GFP_KERNEL,
559 &urb->transfer_dma);
560
561 if (urb->transfer_buffer == NULL) {
562 usb_free_urb(urb);
563 err("usb_buffer_urb failed");
564 destroy_urbs(gspca_dev);
565 return -ENOMEM;
566 }
567 gspca_dev->urb[n] = urb;
568 urb->dev = gspca_dev->dev;
569 urb->context = gspca_dev;
570 urb->transfer_buffer_length = bsize;
571 if (npkt != 0) { /* ISOC */
572 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
573 ep->desc.bEndpointAddress);
574 urb->transfer_flags = URB_ISO_ASAP
575 | URB_NO_TRANSFER_DMA_MAP;
576 urb->interval = ep->desc.bInterval;
577 urb->complete = isoc_irq;
578 urb->number_of_packets = npkt;
579 for (i = 0; i < npkt; i++) {
580 urb->iso_frame_desc[i].length = psize;
581 urb->iso_frame_desc[i].offset = psize * i;
582 }
583 } else { /* bulk */
584 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
585 ep->desc.bEndpointAddress),
586 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
587 urb->complete = bulk_irq;
588 }
589 }
590 return 0;
591 }
592
593 /*
594 * start the USB transfer
595 */
596 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
597 {
598 struct usb_host_endpoint *ep;
599 int n, ret;
600
601 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
602 return -ERESTARTSYS;
603
604 /* set the higher alternate setting and
605 * loop until urb submit succeeds */
606 gspca_dev->alt = gspca_dev->nbalt;
607 for (;;) {
608 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
609 ep = get_ep(gspca_dev);
610 if (ep == NULL) {
611 ret = -EIO;
612 goto out;
613 }
614 ret = create_urbs(gspca_dev, ep);
615 if (ret < 0)
616 goto out;
617
618 /* clear the bulk endpoint */
619 if (gspca_dev->alt == 0) /* if bulk transfer */
620 usb_clear_halt(gspca_dev->dev,
621 usb_rcvintpipe(gspca_dev->dev,
622 gspca_dev->cam.epaddr));
623
624 /* start the cam */
625 ret = gspca_dev->sd_desc->start(gspca_dev);
626 if (ret < 0) {
627 destroy_urbs(gspca_dev);
628 goto out;
629 }
630 gspca_dev->streaming = 1;
631 atomic_set(&gspca_dev->nevent, 0);
632
633 /* some bulk transfers are started by the subdriver */
634 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
635 break;
636
637 /* submit the URBs */
638 for (n = 0; n < gspca_dev->nurbs; n++) {
639 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
640 if (ret < 0) {
641 PDEBUG(D_ERR|D_STREAM,
642 "usb_submit_urb [%d] err %d", n, ret);
643 gspca_dev->streaming = 0;
644 destroy_urbs(gspca_dev);
645 if (ret == -ENOSPC)
646 break; /* try the previous alt */
647 goto out;
648 }
649 }
650 if (ret >= 0)
651 break;
652 }
653 out:
654 mutex_unlock(&gspca_dev->usb_lock);
655 return ret;
656 }
657
658 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
659 {
660 int ret;
661
662 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
663 if (ret < 0)
664 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
665 return ret;
666 }
667
668 /* Note: both the queue and the usb locks should be held when calling this */
669 static void gspca_stream_off(struct gspca_dev *gspca_dev)
670 {
671 gspca_dev->streaming = 0;
672 atomic_set(&gspca_dev->nevent, 0);
673 if (gspca_dev->present
674 && gspca_dev->sd_desc->stopN)
675 gspca_dev->sd_desc->stopN(gspca_dev);
676 destroy_urbs(gspca_dev);
677 gspca_set_alt0(gspca_dev);
678 if (gspca_dev->sd_desc->stop0)
679 gspca_dev->sd_desc->stop0(gspca_dev);
680 PDEBUG(D_STREAM, "stream off OK");
681 }
682
683 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
684 {
685 int i;
686
687 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
688 gspca_dev->curr_mode = i;
689 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
690 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
691 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
692 }
693
694 static int wxh_to_mode(struct gspca_dev *gspca_dev,
695 int width, int height)
696 {
697 int i;
698
699 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
700 if (width >= gspca_dev->cam.cam_mode[i].width
701 && height >= gspca_dev->cam.cam_mode[i].height)
702 break;
703 }
704 return i;
705 }
706
707 /*
708 * search a mode with the right pixel format
709 */
710 static int gspca_get_mode(struct gspca_dev *gspca_dev,
711 int mode,
712 int pixfmt)
713 {
714 int modeU, modeD;
715
716 modeU = modeD = mode;
717 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
718 if (--modeD >= 0) {
719 if (gspca_dev->cam.cam_mode[modeD].pixelformat
720 == pixfmt)
721 return modeD;
722 }
723 if (++modeU < gspca_dev->cam.nmodes) {
724 if (gspca_dev->cam.cam_mode[modeU].pixelformat
725 == pixfmt)
726 return modeU;
727 }
728 }
729 return -EINVAL;
730 }
731
732 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
733 struct v4l2_fmtdesc *fmtdesc)
734 {
735 struct gspca_dev *gspca_dev = priv;
736 int i, j, index;
737 __u32 fmt_tb[8];
738
739 /* give an index to each format */
740 index = 0;
741 j = 0;
742 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
743 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
744 j = 0;
745 for (;;) {
746 if (fmt_tb[j] == fmt_tb[index])
747 break;
748 j++;
749 }
750 if (j == index) {
751 if (fmtdesc->index == index)
752 break; /* new format */
753 index++;
754 if (index >= ARRAY_SIZE(fmt_tb))
755 return -EINVAL;
756 }
757 }
758 if (i < 0)
759 return -EINVAL; /* no more format */
760
761 fmtdesc->pixelformat = fmt_tb[index];
762 if (gspca_is_compressed(fmt_tb[index]))
763 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
764 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
765 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
766 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
767 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
768 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
769 fmtdesc->description[4] = '\0';
770 return 0;
771 }
772
773 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
774 struct v4l2_format *fmt)
775 {
776 struct gspca_dev *gspca_dev = priv;
777 int mode;
778
779 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
780 return -EINVAL;
781 mode = gspca_dev->curr_mode;
782 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
783 sizeof fmt->fmt.pix);
784 return 0;
785 }
786
787 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
788 struct v4l2_format *fmt)
789 {
790 int w, h, mode, mode2;
791
792 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
793 return -EINVAL;
794 w = fmt->fmt.pix.width;
795 h = fmt->fmt.pix.height;
796
797 #ifdef GSPCA_DEBUG
798 if (gspca_debug & D_CONF)
799 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
800 #endif
801 /* search the closest mode for width and height */
802 mode = wxh_to_mode(gspca_dev, w, h);
803
804 /* OK if right palette */
805 if (gspca_dev->cam.cam_mode[mode].pixelformat
806 != fmt->fmt.pix.pixelformat) {
807
808 /* else, search the closest mode with the same pixel format */
809 mode2 = gspca_get_mode(gspca_dev, mode,
810 fmt->fmt.pix.pixelformat);
811 if (mode2 >= 0)
812 mode = mode2;
813 /* else
814 ; * no chance, return this mode */
815 }
816 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
817 sizeof fmt->fmt.pix);
818 return mode; /* used when s_fmt */
819 }
820
821 static int vidioc_try_fmt_vid_cap(struct file *file,
822 void *priv,
823 struct v4l2_format *fmt)
824 {
825 struct gspca_dev *gspca_dev = priv;
826 int ret;
827
828 ret = try_fmt_vid_cap(gspca_dev, fmt);
829 if (ret < 0)
830 return ret;
831 return 0;
832 }
833
834 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
835 struct v4l2_format *fmt)
836 {
837 struct gspca_dev *gspca_dev = priv;
838 int ret;
839
840 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
841 return -ERESTARTSYS;
842
843 ret = try_fmt_vid_cap(gspca_dev, fmt);
844 if (ret < 0)
845 goto out;
846
847 if (gspca_dev->nframes != 0
848 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
849 ret = -EINVAL;
850 goto out;
851 }
852
853 if (ret == gspca_dev->curr_mode) {
854 ret = 0;
855 goto out; /* same mode */
856 }
857
858 if (gspca_dev->streaming) {
859 ret = -EBUSY;
860 goto out;
861 }
862 gspca_dev->width = fmt->fmt.pix.width;
863 gspca_dev->height = fmt->fmt.pix.height;
864 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
865 gspca_dev->curr_mode = ret;
866
867 ret = 0;
868 out:
869 mutex_unlock(&gspca_dev->queue_lock);
870 return ret;
871 }
872
873 static void gspca_release(struct video_device *vfd)
874 {
875 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
876
877 PDEBUG(D_STREAM, "device released");
878
879 kfree(gspca_dev->usb_buf);
880 kfree(gspca_dev);
881 }
882
883 static int dev_open(struct inode *inode, struct file *file)
884 {
885 struct gspca_dev *gspca_dev;
886 int ret;
887
888 PDEBUG(D_STREAM, "%s open", current->comm);
889 gspca_dev = (struct gspca_dev *) video_devdata(file);
890 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
891 return -ERESTARTSYS;
892 if (!gspca_dev->present) {
893 ret = -ENODEV;
894 goto out;
895 }
896
897 if (gspca_dev->users > 4) { /* (arbitrary value) */
898 ret = -EBUSY;
899 goto out;
900 }
901
902 /* protect the subdriver against rmmod */
903 if (!try_module_get(gspca_dev->module)) {
904 ret = -ENODEV;
905 goto out;
906 }
907
908 gspca_dev->users++;
909
910 file->private_data = gspca_dev;
911 #ifdef GSPCA_DEBUG
912 /* activate the v4l2 debug */
913 if (gspca_debug & D_V4L2)
914 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
915 | V4L2_DEBUG_IOCTL_ARG;
916 else
917 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
918 | V4L2_DEBUG_IOCTL_ARG);
919 #endif
920 ret = 0;
921 out:
922 mutex_unlock(&gspca_dev->queue_lock);
923 if (ret != 0)
924 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
925 else
926 PDEBUG(D_STREAM, "open done");
927 return ret;
928 }
929
930 static int dev_close(struct inode *inode, struct file *file)
931 {
932 struct gspca_dev *gspca_dev = file->private_data;
933
934 PDEBUG(D_STREAM, "%s close", current->comm);
935 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
936 return -ERESTARTSYS;
937 gspca_dev->users--;
938
939 /* if the file did the capture, free the streaming resources */
940 if (gspca_dev->capt_file == file) {
941 if (gspca_dev->streaming) {
942 mutex_lock(&gspca_dev->usb_lock);
943 gspca_stream_off(gspca_dev);
944 mutex_unlock(&gspca_dev->usb_lock);
945 }
946 frame_free(gspca_dev);
947 gspca_dev->capt_file = NULL;
948 gspca_dev->memory = GSPCA_MEMORY_NO;
949 }
950 file->private_data = NULL;
951 module_put(gspca_dev->module);
952 mutex_unlock(&gspca_dev->queue_lock);
953
954 PDEBUG(D_STREAM, "close done");
955
956 return 0;
957 }
958
959 static int vidioc_querycap(struct file *file, void *priv,
960 struct v4l2_capability *cap)
961 {
962 struct gspca_dev *gspca_dev = priv;
963
964 memset(cap, 0, sizeof *cap);
965 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
966 if (gspca_dev->dev->product != NULL) {
967 strncpy(cap->card, gspca_dev->dev->product,
968 sizeof cap->card);
969 } else {
970 snprintf(cap->card, sizeof cap->card,
971 "USB Camera (%04x:%04x)",
972 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
973 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
974 }
975 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
976 sizeof cap->bus_info);
977 cap->version = DRIVER_VERSION_NUMBER;
978 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
979 | V4L2_CAP_STREAMING
980 | V4L2_CAP_READWRITE;
981 return 0;
982 }
983
984 static int vidioc_queryctrl(struct file *file, void *priv,
985 struct v4l2_queryctrl *q_ctrl)
986 {
987 struct gspca_dev *gspca_dev = priv;
988 int i, ix;
989 u32 id;
990
991 ix = -1;
992 id = q_ctrl->id;
993 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
994 id &= V4L2_CTRL_ID_MASK;
995 id++;
996 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
997 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
998 continue;
999 if (ix < 0) {
1000 ix = i;
1001 continue;
1002 }
1003 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1004 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1005 continue;
1006 ix = i;
1007 }
1008 }
1009 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1010 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1011 ix = i;
1012 break;
1013 }
1014 }
1015 if (ix < 0)
1016 return -EINVAL;
1017 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1018 sizeof *q_ctrl);
1019 if (gspca_dev->ctrl_dis & (1 << ix))
1020 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1021 return 0;
1022 }
1023
1024 static int vidioc_s_ctrl(struct file *file, void *priv,
1025 struct v4l2_control *ctrl)
1026 {
1027 struct gspca_dev *gspca_dev = priv;
1028 const struct ctrl *ctrls;
1029 int i, ret;
1030
1031 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1032 i < gspca_dev->sd_desc->nctrls;
1033 i++, ctrls++) {
1034 if (ctrl->id != ctrls->qctrl.id)
1035 continue;
1036 if (gspca_dev->ctrl_dis & (1 << i))
1037 return -EINVAL;
1038 if (ctrl->value < ctrls->qctrl.minimum
1039 || ctrl->value > ctrls->qctrl.maximum)
1040 return -ERANGE;
1041 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1042 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1043 return -ERESTARTSYS;
1044 ret = ctrls->set(gspca_dev, ctrl->value);
1045 mutex_unlock(&gspca_dev->usb_lock);
1046 return ret;
1047 }
1048 return -EINVAL;
1049 }
1050
1051 static int vidioc_g_ctrl(struct file *file, void *priv,
1052 struct v4l2_control *ctrl)
1053 {
1054 struct gspca_dev *gspca_dev = priv;
1055
1056 const struct ctrl *ctrls;
1057 int i, ret;
1058
1059 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1060 i < gspca_dev->sd_desc->nctrls;
1061 i++, ctrls++) {
1062 if (ctrl->id != ctrls->qctrl.id)
1063 continue;
1064 if (gspca_dev->ctrl_dis & (1 << i))
1065 return -EINVAL;
1066 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1067 return -ERESTARTSYS;
1068 ret = ctrls->get(gspca_dev, &ctrl->value);
1069 mutex_unlock(&gspca_dev->usb_lock);
1070 return ret;
1071 }
1072 return -EINVAL;
1073 }
1074
1075 static int vidioc_querymenu(struct file *file, void *priv,
1076 struct v4l2_querymenu *qmenu)
1077 {
1078 struct gspca_dev *gspca_dev = priv;
1079
1080 if (!gspca_dev->sd_desc->querymenu)
1081 return -EINVAL;
1082 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1083 }
1084
1085 static int vidioc_enum_input(struct file *file, void *priv,
1086 struct v4l2_input *input)
1087 {
1088 struct gspca_dev *gspca_dev = priv;
1089
1090 if (input->index != 0)
1091 return -EINVAL;
1092 memset(input, 0, sizeof *input);
1093 input->type = V4L2_INPUT_TYPE_CAMERA;
1094 strncpy(input->name, gspca_dev->sd_desc->name,
1095 sizeof input->name);
1096 return 0;
1097 }
1098
1099 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1100 {
1101 *i = 0;
1102 return 0;
1103 }
1104
1105 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1106 {
1107 if (i > 0)
1108 return -EINVAL;
1109 return (0);
1110 }
1111
1112 static int vidioc_reqbufs(struct file *file, void *priv,
1113 struct v4l2_requestbuffers *rb)
1114 {
1115 struct gspca_dev *gspca_dev = priv;
1116 int i, ret = 0;
1117
1118 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1119 return -EINVAL;
1120 switch (rb->memory) {
1121 case GSPCA_MEMORY_READ: /* (internal call) */
1122 case V4L2_MEMORY_MMAP:
1123 case V4L2_MEMORY_USERPTR:
1124 break;
1125 default:
1126 return -EINVAL;
1127 }
1128 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1129 return -ERESTARTSYS;
1130
1131 if (gspca_dev->memory != GSPCA_MEMORY_NO
1132 && gspca_dev->memory != rb->memory) {
1133 ret = -EBUSY;
1134 goto out;
1135 }
1136
1137 /* only one file may do the capture */
1138 if (gspca_dev->capt_file != NULL
1139 && gspca_dev->capt_file != file) {
1140 ret = -EBUSY;
1141 goto out;
1142 }
1143
1144 /* if allocated, the buffers must not be mapped */
1145 for (i = 0; i < gspca_dev->nframes; i++) {
1146 if (gspca_dev->frame[i].vma_use_count) {
1147 ret = -EBUSY;
1148 goto out;
1149 }
1150 }
1151
1152 /* stop streaming */
1153 if (gspca_dev->streaming) {
1154 mutex_lock(&gspca_dev->usb_lock);
1155 gspca_stream_off(gspca_dev);
1156 mutex_unlock(&gspca_dev->usb_lock);
1157 }
1158
1159 /* free the previous allocated buffers, if any */
1160 if (gspca_dev->nframes != 0) {
1161 frame_free(gspca_dev);
1162 gspca_dev->capt_file = NULL;
1163 }
1164 if (rb->count == 0) /* unrequest */
1165 goto out;
1166 gspca_dev->memory = rb->memory;
1167 ret = frame_alloc(gspca_dev, rb->count);
1168 if (ret == 0) {
1169 rb->count = gspca_dev->nframes;
1170 gspca_dev->capt_file = file;
1171 }
1172 out:
1173 mutex_unlock(&gspca_dev->queue_lock);
1174 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1175 return ret;
1176 }
1177
1178 static int vidioc_querybuf(struct file *file, void *priv,
1179 struct v4l2_buffer *v4l2_buf)
1180 {
1181 struct gspca_dev *gspca_dev = priv;
1182 struct gspca_frame *frame;
1183
1184 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1185 || v4l2_buf->index < 0
1186 || v4l2_buf->index >= gspca_dev->nframes)
1187 return -EINVAL;
1188
1189 frame = &gspca_dev->frame[v4l2_buf->index];
1190 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1191 return 0;
1192 }
1193
1194 static int vidioc_streamon(struct file *file, void *priv,
1195 enum v4l2_buf_type buf_type)
1196 {
1197 struct gspca_dev *gspca_dev = priv;
1198 int ret;
1199
1200 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1201 return -EINVAL;
1202 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1203 return -ERESTARTSYS;
1204 if (!gspca_dev->present) {
1205 ret = -ENODEV;
1206 goto out;
1207 }
1208 if (gspca_dev->nframes == 0) {
1209 ret = -EINVAL;
1210 goto out;
1211 }
1212 if (!gspca_dev->streaming) {
1213 ret = gspca_init_transfer(gspca_dev);
1214 if (ret < 0)
1215 goto out;
1216 }
1217 #ifdef GSPCA_DEBUG
1218 if (gspca_debug & D_STREAM) {
1219 PDEBUG_MODE("stream on OK",
1220 gspca_dev->pixfmt,
1221 gspca_dev->width,
1222 gspca_dev->height);
1223 }
1224 #endif
1225 ret = 0;
1226 out:
1227 mutex_unlock(&gspca_dev->queue_lock);
1228 return ret;
1229 }
1230
1231 static int vidioc_streamoff(struct file *file, void *priv,
1232 enum v4l2_buf_type buf_type)
1233 {
1234 struct gspca_dev *gspca_dev = priv;
1235 int i, ret;
1236
1237 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1238 return -EINVAL;
1239 if (!gspca_dev->streaming)
1240 return 0;
1241 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1242 return -ERESTARTSYS;
1243
1244 /* stop streaming */
1245 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1246 ret = -ERESTARTSYS;
1247 goto out;
1248 }
1249 gspca_stream_off(gspca_dev);
1250 mutex_unlock(&gspca_dev->usb_lock);
1251
1252 /* empty the application queues */
1253 for (i = 0; i < gspca_dev->nframes; i++)
1254 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1255 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1256 gspca_dev->last_packet_type = DISCARD_PACKET;
1257 gspca_dev->sequence = 0;
1258 atomic_set(&gspca_dev->nevent, 0);
1259 ret = 0;
1260 out:
1261 mutex_unlock(&gspca_dev->queue_lock);
1262 return ret;
1263 }
1264
1265 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1266 struct v4l2_jpegcompression *jpegcomp)
1267 {
1268 struct gspca_dev *gspca_dev = priv;
1269 int ret;
1270
1271 if (!gspca_dev->sd_desc->get_jcomp)
1272 return -EINVAL;
1273 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1274 return -ERESTARTSYS;
1275 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1276 mutex_unlock(&gspca_dev->usb_lock);
1277 return ret;
1278 }
1279
1280 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1281 struct v4l2_jpegcompression *jpegcomp)
1282 {
1283 struct gspca_dev *gspca_dev = priv;
1284 int ret;
1285
1286 if (!gspca_dev->sd_desc->set_jcomp)
1287 return -EINVAL;
1288 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1289 return -ERESTARTSYS;
1290 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1291 mutex_unlock(&gspca_dev->usb_lock);
1292 return ret;
1293 }
1294
1295 static int vidioc_g_parm(struct file *filp, void *priv,
1296 struct v4l2_streamparm *parm)
1297 {
1298 struct gspca_dev *gspca_dev = priv;
1299
1300 memset(parm, 0, sizeof *parm);
1301 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1302 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1303 return 0;
1304 }
1305
1306 static int vidioc_s_parm(struct file *filp, void *priv,
1307 struct v4l2_streamparm *parm)
1308 {
1309 struct gspca_dev *gspca_dev = priv;
1310 int n;
1311
1312 n = parm->parm.capture.readbuffers;
1313 if (n == 0 || n > GSPCA_MAX_FRAMES)
1314 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1315 else
1316 gspca_dev->nbufread = n;
1317 return 0;
1318 }
1319
1320 static int vidioc_s_std(struct file *filp, void *priv,
1321 v4l2_std_id *parm)
1322 {
1323 return 0;
1324 }
1325
1326 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1327 static int vidiocgmbuf(struct file *file, void *priv,
1328 struct video_mbuf *mbuf)
1329 {
1330 struct gspca_dev *gspca_dev = file->private_data;
1331 int i;
1332
1333 PDEBUG(D_STREAM, "cgmbuf");
1334 if (gspca_dev->nframes == 0) {
1335 int ret;
1336
1337 {
1338 struct v4l2_format fmt;
1339
1340 memset(&fmt, 0, sizeof fmt);
1341 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1342 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1343 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1344 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1345 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1346 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1347 if (ret != 0)
1348 return ret;
1349 }
1350 {
1351 struct v4l2_requestbuffers rb;
1352
1353 memset(&rb, 0, sizeof rb);
1354 rb.count = 4;
1355 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1356 rb.memory = V4L2_MEMORY_MMAP;
1357 ret = vidioc_reqbufs(file, priv, &rb);
1358 if (ret != 0)
1359 return ret;
1360 }
1361 }
1362 mbuf->frames = gspca_dev->nframes;
1363 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1364 for (i = 0; i < mbuf->frames; i++)
1365 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1366 return 0;
1367 }
1368 #endif
1369
1370 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1371 {
1372 struct gspca_dev *gspca_dev = file->private_data;
1373 struct gspca_frame *frame;
1374 struct page *page;
1375 unsigned long addr, start, size;
1376 int i, ret;
1377
1378 start = vma->vm_start;
1379 size = vma->vm_end - vma->vm_start;
1380 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1381
1382 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1383 return -ERESTARTSYS;
1384 if (!gspca_dev->present) {
1385 ret = -ENODEV;
1386 goto out;
1387 }
1388 if (gspca_dev->capt_file != file) {
1389 ret = -EINVAL;
1390 goto out;
1391 }
1392
1393 frame = NULL;
1394 for (i = 0; i < gspca_dev->nframes; ++i) {
1395 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1396 PDEBUG(D_STREAM, "mmap bad memory type");
1397 break;
1398 }
1399 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1400 == vma->vm_pgoff) {
1401 frame = &gspca_dev->frame[i];
1402 break;
1403 }
1404 }
1405 if (frame == NULL) {
1406 PDEBUG(D_STREAM, "mmap no frame buffer found");
1407 ret = -EINVAL;
1408 goto out;
1409 }
1410 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1411 /* v4l1 maps all the buffers */
1412 if (i != 0
1413 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1414 #endif
1415 if (size != frame->v4l2_buf.length) {
1416 PDEBUG(D_STREAM, "mmap bad size");
1417 ret = -EINVAL;
1418 goto out;
1419 }
1420
1421 /*
1422 * - VM_IO marks the area as being a mmaped region for I/O to a
1423 * device. It also prevents the region from being core dumped.
1424 */
1425 vma->vm_flags |= VM_IO;
1426
1427 addr = (unsigned long) frame->data;
1428 while (size > 0) {
1429 page = vmalloc_to_page((void *) addr);
1430 ret = vm_insert_page(vma, start, page);
1431 if (ret < 0)
1432 goto out;
1433 start += PAGE_SIZE;
1434 addr += PAGE_SIZE;
1435 size -= PAGE_SIZE;
1436 }
1437
1438 vma->vm_ops = &gspca_vm_ops;
1439 vma->vm_private_data = frame;
1440 gspca_vm_open(vma);
1441 ret = 0;
1442 out:
1443 mutex_unlock(&gspca_dev->queue_lock);
1444 return ret;
1445 }
1446
1447 /*
1448 * wait for a video frame
1449 *
1450 * If a frame is ready, its index is returned.
1451 */
1452 static int frame_wait(struct gspca_dev *gspca_dev,
1453 int nonblock_ing)
1454 {
1455 struct gspca_frame *frame;
1456 int i, j, ret;
1457
1458 /* check if a frame is ready */
1459 i = gspca_dev->fr_o;
1460 j = gspca_dev->fr_queue[i];
1461 frame = &gspca_dev->frame[j];
1462 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1463 atomic_dec(&gspca_dev->nevent);
1464 goto ok;
1465 }
1466 if (nonblock_ing) /* no frame yet */
1467 return -EAGAIN;
1468
1469 /* wait till a frame is ready */
1470 for (;;) {
1471 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1472 atomic_read(&gspca_dev->nevent) > 0,
1473 msecs_to_jiffies(3000));
1474 if (ret <= 0) {
1475 if (ret < 0)
1476 return ret; /* interrupt */
1477 return -EIO; /* timeout */
1478 }
1479 atomic_dec(&gspca_dev->nevent);
1480 if (!gspca_dev->streaming || !gspca_dev->present)
1481 return -EIO;
1482 i = gspca_dev->fr_o;
1483 j = gspca_dev->fr_queue[i];
1484 frame = &gspca_dev->frame[j];
1485 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1486 break;
1487 }
1488 ok:
1489 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1490 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1491 gspca_dev->fr_q,
1492 gspca_dev->fr_i,
1493 gspca_dev->fr_o);
1494
1495 if (gspca_dev->sd_desc->dq_callback) {
1496 mutex_lock(&gspca_dev->usb_lock);
1497 gspca_dev->sd_desc->dq_callback(gspca_dev);
1498 mutex_unlock(&gspca_dev->usb_lock);
1499 }
1500 return j;
1501 }
1502
1503 /*
1504 * dequeue a video buffer
1505 *
1506 * If nonblock_ing is false, block until a buffer is available.
1507 */
1508 static int vidioc_dqbuf(struct file *file, void *priv,
1509 struct v4l2_buffer *v4l2_buf)
1510 {
1511 struct gspca_dev *gspca_dev = priv;
1512 struct gspca_frame *frame;
1513 int i, ret;
1514
1515 PDEBUG(D_FRAM, "dqbuf");
1516 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1517 return -EINVAL;
1518 if (v4l2_buf->memory != gspca_dev->memory)
1519 return -EINVAL;
1520
1521 /* if not streaming, be sure the application will not loop forever */
1522 if (!(file->f_flags & O_NONBLOCK)
1523 && !gspca_dev->streaming && gspca_dev->users == 1)
1524 return -EINVAL;
1525
1526 /* only the capturing file may dequeue */
1527 if (gspca_dev->capt_file != file)
1528 return -EINVAL;
1529
1530 /* only one dequeue / read at a time */
1531 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1532 return -ERESTARTSYS;
1533
1534 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1535 if (ret < 0)
1536 goto out;
1537 i = ret; /* frame index */
1538 frame = &gspca_dev->frame[i];
1539 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1540 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1541 frame->data,
1542 frame->v4l2_buf.bytesused)) {
1543 PDEBUG(D_ERR|D_STREAM,
1544 "dqbuf cp to user failed");
1545 ret = -EFAULT;
1546 goto out;
1547 }
1548 }
1549 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1550 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1551 PDEBUG(D_FRAM, "dqbuf %d", i);
1552 ret = 0;
1553 out:
1554 mutex_unlock(&gspca_dev->read_lock);
1555 return ret;
1556 }
1557
1558 /*
1559 * queue a video buffer
1560 *
1561 * Attempting to queue a buffer that has already been
1562 * queued will return -EINVAL.
1563 */
1564 static int vidioc_qbuf(struct file *file, void *priv,
1565 struct v4l2_buffer *v4l2_buf)
1566 {
1567 struct gspca_dev *gspca_dev = priv;
1568 struct gspca_frame *frame;
1569 int i, index, ret;
1570
1571 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1572 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1573 return -EINVAL;
1574
1575 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1576 return -ERESTARTSYS;
1577
1578 index = v4l2_buf->index;
1579 if ((unsigned) index >= gspca_dev->nframes) {
1580 PDEBUG(D_FRAM,
1581 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1582 ret = -EINVAL;
1583 goto out;
1584 }
1585 if (v4l2_buf->memory != gspca_dev->memory) {
1586 PDEBUG(D_FRAM, "qbuf bad memory type");
1587 ret = -EINVAL;
1588 goto out;
1589 }
1590
1591 frame = &gspca_dev->frame[index];
1592 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1593 PDEBUG(D_FRAM, "qbuf bad state");
1594 ret = -EINVAL;
1595 goto out;
1596 }
1597
1598 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1599
1600 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1601 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1602 frame->v4l2_buf.length = v4l2_buf->length;
1603 }
1604
1605 /* put the buffer in the 'queued' queue */
1606 i = gspca_dev->fr_q;
1607 gspca_dev->fr_queue[i] = index;
1608 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1609 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1610 gspca_dev->fr_q,
1611 gspca_dev->fr_i,
1612 gspca_dev->fr_o);
1613
1614 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1615 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1616 ret = 0;
1617 out:
1618 mutex_unlock(&gspca_dev->queue_lock);
1619 return ret;
1620 }
1621
1622 /*
1623 * allocate the resources for read()
1624 */
1625 static int read_alloc(struct gspca_dev *gspca_dev,
1626 struct file *file)
1627 {
1628 struct v4l2_buffer v4l2_buf;
1629 int i, ret;
1630
1631 PDEBUG(D_STREAM, "read alloc");
1632 if (gspca_dev->nframes == 0) {
1633 struct v4l2_requestbuffers rb;
1634
1635 memset(&rb, 0, sizeof rb);
1636 rb.count = gspca_dev->nbufread;
1637 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1638 rb.memory = GSPCA_MEMORY_READ;
1639 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1640 if (ret != 0) {
1641 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1642 return ret;
1643 }
1644 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1645 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1646 v4l2_buf.memory = GSPCA_MEMORY_READ;
1647 for (i = 0; i < gspca_dev->nbufread; i++) {
1648 v4l2_buf.index = i;
1649 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1650 if (ret != 0) {
1651 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1652 return ret;
1653 }
1654 }
1655 gspca_dev->memory = GSPCA_MEMORY_READ;
1656 }
1657
1658 /* start streaming */
1659 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1660 if (ret != 0)
1661 PDEBUG(D_STREAM, "read streamon err %d", ret);
1662 return ret;
1663 }
1664
1665 static unsigned int dev_poll(struct file *file, poll_table *wait)
1666 {
1667 struct gspca_dev *gspca_dev = file->private_data;
1668 int i, ret;
1669
1670 PDEBUG(D_FRAM, "poll");
1671
1672 poll_wait(file, &gspca_dev->wq, wait);
1673 if (!gspca_dev->present)
1674 return POLLERR;
1675
1676 /* if reqbufs is not done, the user would use read() */
1677 if (gspca_dev->nframes == 0) {
1678 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1679 return POLLERR; /* not the 1st time */
1680 ret = read_alloc(gspca_dev, file);
1681 if (ret != 0)
1682 return POLLERR;
1683 }
1684
1685 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1686 return POLLERR;
1687 if (!gspca_dev->present) {
1688 ret = POLLERR;
1689 goto out;
1690 }
1691
1692 /* check the next incoming buffer */
1693 i = gspca_dev->fr_o;
1694 i = gspca_dev->fr_queue[i];
1695 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1696 ret = POLLIN | POLLRDNORM; /* something to read */
1697 else
1698 ret = 0;
1699 out:
1700 mutex_unlock(&gspca_dev->queue_lock);
1701 return ret;
1702 }
1703
1704 static ssize_t dev_read(struct file *file, char __user *data,
1705 size_t count, loff_t *ppos)
1706 {
1707 struct gspca_dev *gspca_dev = file->private_data;
1708 struct gspca_frame *frame;
1709 struct v4l2_buffer v4l2_buf;
1710 struct timeval timestamp;
1711 int n, ret, ret2;
1712
1713 PDEBUG(D_FRAM, "read (%zd)", count);
1714 if (!gspca_dev->present)
1715 return -ENODEV;
1716 switch (gspca_dev->memory) {
1717 case GSPCA_MEMORY_NO: /* first time */
1718 ret = read_alloc(gspca_dev, file);
1719 if (ret != 0)
1720 return ret;
1721 break;
1722 case GSPCA_MEMORY_READ:
1723 if (gspca_dev->capt_file == file)
1724 break;
1725 /* fall thru */
1726 default:
1727 return -EINVAL;
1728 }
1729
1730 /* get a frame */
1731 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1732 timestamp.tv_sec--;
1733 n = 2;
1734 for (;;) {
1735 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1736 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1737 v4l2_buf.memory = GSPCA_MEMORY_READ;
1738 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1739 if (ret != 0) {
1740 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1741 return ret;
1742 }
1743
1744 /* if the process slept for more than 1 second,
1745 * get a newer frame */
1746 frame = &gspca_dev->frame[v4l2_buf.index];
1747 if (--n < 0)
1748 break; /* avoid infinite loop */
1749 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1750 break;
1751 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1752 if (ret != 0) {
1753 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1754 return ret;
1755 }
1756 }
1757
1758 /* copy the frame */
1759 if (count > frame->v4l2_buf.bytesused)
1760 count = frame->v4l2_buf.bytesused;
1761 ret = copy_to_user(data, frame->data, count);
1762 if (ret != 0) {
1763 PDEBUG(D_ERR|D_STREAM,
1764 "read cp to user lack %d / %zd", ret, count);
1765 ret = -EFAULT;
1766 goto out;
1767 }
1768 ret = count;
1769 out:
1770 /* in each case, requeue the buffer */
1771 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1772 if (ret2 != 0)
1773 return ret2;
1774 return ret;
1775 }
1776
1777 static struct file_operations dev_fops = {
1778 .owner = THIS_MODULE,
1779 .open = dev_open,
1780 .release = dev_close,
1781 .read = dev_read,
1782 .mmap = dev_mmap,
1783 .ioctl = video_ioctl2,
1784 #ifdef CONFIG_COMPAT
1785 .compat_ioctl = v4l_compat_ioctl32,
1786 #endif
1787 .llseek = no_llseek,
1788 .poll = dev_poll,
1789 };
1790
1791 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1792 .vidioc_querycap = vidioc_querycap,
1793 .vidioc_dqbuf = vidioc_dqbuf,
1794 .vidioc_qbuf = vidioc_qbuf,
1795 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1796 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1797 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1798 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1799 .vidioc_streamon = vidioc_streamon,
1800 .vidioc_queryctrl = vidioc_queryctrl,
1801 .vidioc_g_ctrl = vidioc_g_ctrl,
1802 .vidioc_s_ctrl = vidioc_s_ctrl,
1803 .vidioc_querymenu = vidioc_querymenu,
1804 .vidioc_enum_input = vidioc_enum_input,
1805 .vidioc_g_input = vidioc_g_input,
1806 .vidioc_s_input = vidioc_s_input,
1807 .vidioc_reqbufs = vidioc_reqbufs,
1808 .vidioc_querybuf = vidioc_querybuf,
1809 .vidioc_streamoff = vidioc_streamoff,
1810 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1811 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1812 .vidioc_g_parm = vidioc_g_parm,
1813 .vidioc_s_parm = vidioc_s_parm,
1814 .vidioc_s_std = vidioc_s_std,
1815 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1816 .vidiocgmbuf = vidiocgmbuf,
1817 #endif
1818 };
1819
1820 static struct video_device gspca_template = {
1821 .name = "gspca main driver",
1822 .fops = &dev_fops,
1823 .ioctl_ops = &dev_ioctl_ops,
1824 .release = gspca_release,
1825 .minor = -1,
1826 };
1827
1828 /*
1829 * probe and create a new gspca device
1830 *
1831 * This function must be called by the sub-driver when it is
1832 * called for probing a new device.
1833 */
1834 int gspca_dev_probe(struct usb_interface *intf,
1835 const struct usb_device_id *id,
1836 const struct sd_desc *sd_desc,
1837 int dev_size,
1838 struct module *module)
1839 {
1840 struct usb_interface_descriptor *interface;
1841 struct gspca_dev *gspca_dev;
1842 struct usb_device *dev = interface_to_usbdev(intf);
1843 int ret;
1844
1845 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1846
1847 /* we don't handle multi-config cameras */
1848 if (dev->descriptor.bNumConfigurations != 1)
1849 return -ENODEV;
1850 interface = &intf->cur_altsetting->desc;
1851 if (interface->bInterfaceNumber > 0)
1852 return -ENODEV;
1853
1854 /* create the device */
1855 if (dev_size < sizeof *gspca_dev)
1856 dev_size = sizeof *gspca_dev;
1857 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1858 if (!gspca_dev) {
1859 err("couldn't kzalloc gspca struct");
1860 return -ENOMEM;
1861 }
1862 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1863 if (!gspca_dev->usb_buf) {
1864 err("out of memory");
1865 ret = -ENOMEM;
1866 goto out;
1867 }
1868 gspca_dev->dev = dev;
1869 gspca_dev->iface = interface->bInterfaceNumber;
1870 gspca_dev->nbalt = intf->num_altsetting;
1871 gspca_dev->sd_desc = sd_desc;
1872 gspca_dev->nbufread = 2;
1873 gspca_dev->empty_packet = -1; /* don't check the empty packets */
1874
1875 /* configure the subdriver and initialize the USB device */
1876 ret = gspca_dev->sd_desc->config(gspca_dev, id);
1877 if (ret < 0)
1878 goto out;
1879 ret = gspca_dev->sd_desc->init(gspca_dev);
1880 if (ret < 0)
1881 goto out;
1882 ret = gspca_set_alt0(gspca_dev);
1883 if (ret < 0)
1884 goto out;
1885 gspca_set_default_mode(gspca_dev);
1886
1887 mutex_init(&gspca_dev->usb_lock);
1888 mutex_init(&gspca_dev->read_lock);
1889 mutex_init(&gspca_dev->queue_lock);
1890 init_waitqueue_head(&gspca_dev->wq);
1891
1892 /* init video stuff */
1893 gspca_dev->vdev = video_device_alloc();
1894 memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1895 gspca_dev->vdev->parent = &dev->dev;
1896 gspca_dev->module = module;
1897 gspca_dev->present = 1;
1898 ret = video_register_device(&gspca_dev->vdev,
1899 VFL_TYPE_GRABBER,
1900 video_nr);
1901 if (ret < 0) {
1902 err("video_register_device err %d", ret);
1903 goto out;
1904 }
1905
1906 usb_set_intfdata(intf, gspca_dev);
1907 PDEBUG(D_PROBE, "probe ok");
1908 return 0;
1909 out:
1910 kfree(gspca_dev->usb_buf);
1911 kfree(gspca_dev);
1912 return ret;
1913 }
1914 EXPORT_SYMBOL(gspca_dev_probe);
1915
1916 /*
1917 * USB disconnection
1918 *
1919 * This function must be called by the sub-driver
1920 * when the device disconnects, after the specific resources are freed.
1921 */
1922 void gspca_disconnect(struct usb_interface *intf)
1923 {
1924 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1925
1926 usb_set_intfdata(intf, NULL);
1927
1928 /* release the device */
1929 /* (this will call gspca_release() immediatly or on last close) */
1930 video_unregister_device(&gspca_dev->vdev);
1931
1932 PDEBUG(D_PROBE, "disconnect complete");
1933 }
1934 EXPORT_SYMBOL(gspca_disconnect);
1935
1936 #ifdef CONFIG_PM
1937 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1938 {
1939 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1940
1941 if (!gspca_dev->streaming)
1942 return 0;
1943 gspca_dev->frozen = 1; /* avoid urb error messages */
1944 if (gspca_dev->sd_desc->stopN)
1945 gspca_dev->sd_desc->stopN(gspca_dev);
1946 destroy_urbs(gspca_dev);
1947 gspca_set_alt0(gspca_dev);
1948 if (gspca_dev->sd_desc->stop0)
1949 gspca_dev->sd_desc->stop0(gspca_dev);
1950 return 0;
1951 }
1952 EXPORT_SYMBOL(gspca_suspend);
1953
1954 int gspca_resume(struct usb_interface *intf)
1955 {
1956 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1957
1958 gspca_dev->frozen = 0;
1959 gspca_dev->sd_desc->init(gspca_dev);
1960 if (gspca_dev->streaming)
1961 return gspca_init_transfer(gspca_dev);
1962 return 0;
1963 }
1964 EXPORT_SYMBOL(gspca_resume);
1965 #endif
1966 /* -- cam driver utility functions -- */
1967
1968 /* auto gain and exposure algorithm based on the knee algorithm described here:
1969 http://ytse.tricolour.net/docs/LowLightOptimization.html
1970
1971 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1972 where changed. */
1973 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1974 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1975 {
1976 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1977 const struct ctrl *gain_ctrl = NULL;
1978 const struct ctrl *exposure_ctrl = NULL;
1979 const struct ctrl *autogain_ctrl = NULL;
1980 int retval = 0;
1981
1982 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1983 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1984 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1985 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1986 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1987 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1988 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1989 }
1990 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1991 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1992 "on cam without (auto)gain/exposure");
1993 return 0;
1994 }
1995
1996 if (gain_ctrl->get(gspca_dev, &gain) ||
1997 exposure_ctrl->get(gspca_dev, &exposure) ||
1998 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1999 return 0;
2000
2001 orig_gain = gain;
2002 orig_exposure = exposure;
2003
2004 /* If we are of a multiple of deadzone, do multiple steps to reach the
2005 desired lumination fast (with the risc of a slight overshoot) */
2006 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2007
2008 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2009 avg_lum, desired_avg_lum, steps);
2010
2011 for (i = 0; i < steps; i++) {
2012 if (avg_lum > desired_avg_lum) {
2013 if (gain > gain_knee)
2014 gain--;
2015 else if (exposure > exposure_knee)
2016 exposure--;
2017 else if (gain > gain_ctrl->qctrl.default_value)
2018 gain--;
2019 else if (exposure > exposure_ctrl->qctrl.minimum)
2020 exposure--;
2021 else if (gain > gain_ctrl->qctrl.minimum)
2022 gain--;
2023 else
2024 break;
2025 } else {
2026 if (gain < gain_ctrl->qctrl.default_value)
2027 gain++;
2028 else if (exposure < exposure_knee)
2029 exposure++;
2030 else if (gain < gain_knee)
2031 gain++;
2032 else if (exposure < exposure_ctrl->qctrl.maximum)
2033 exposure++;
2034 else if (gain < gain_ctrl->qctrl.maximum)
2035 gain++;
2036 else
2037 break;
2038 }
2039 }
2040
2041 if (gain != orig_gain) {
2042 gain_ctrl->set(gspca_dev, gain);
2043 retval = 1;
2044 }
2045 if (exposure != orig_exposure) {
2046 exposure_ctrl->set(gspca_dev, exposure);
2047 retval = 1;
2048 }
2049
2050 return retval;
2051 }
2052 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2053
2054 /* -- module insert / remove -- */
2055 static int __init gspca_init(void)
2056 {
2057 info("main v%d.%d.%d registered",
2058 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2059 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2060 DRIVER_VERSION_NUMBER & 0xff);
2061 return 0;
2062 }
2063 static void __exit gspca_exit(void)
2064 {
2065 info("main deregistered");
2066 }
2067
2068 module_init(gspca_init);
2069 module_exit(gspca_exit);
2070
2071 #ifdef GSPCA_DEBUG
2072 module_param_named(debug, gspca_debug, int, 0644);
2073 MODULE_PARM_DESC(debug,
2074 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2075 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2076 " 0x0100: v4l2");
2077 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree