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[ARM] pxa: add e750 MFP config
[mirror_ubuntu-zesty-kernel.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <linux/kref.h>
34 #include <asm/page.h>
35 #include <linux/uaccess.h>
36 #include <linux/jiffies.h>
37 #include <media/v4l2-ioctl.h>
38
39 #include "gspca.h"
40
41 /* global values */
42 #define DEF_NURBS 2 /* default number of URBs */
43
44 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
45 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
46 MODULE_LICENSE("GPL");
47
48 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 3, 0)
49
50 static int video_nr = -1;
51
52 #ifdef GSPCA_DEBUG
53 int gspca_debug = D_ERR | D_PROBE;
54 EXPORT_SYMBOL(gspca_debug);
55
56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 {
58 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60 txt,
61 pixfmt & 0xff,
62 (pixfmt >> 8) & 0xff,
63 (pixfmt >> 16) & 0xff,
64 pixfmt >> 24,
65 w, h);
66 } else {
67 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68 txt,
69 pixfmt,
70 w, h);
71 }
72 }
73 #else
74 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 #endif
76
77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
78 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
79 #define GSPCA_MEMORY_READ 7
80
81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
82
83 /*
84 * VMA operations.
85 */
86 static void gspca_vm_open(struct vm_area_struct *vma)
87 {
88 struct gspca_frame *frame = vma->vm_private_data;
89
90 frame->vma_use_count++;
91 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 }
93
94 static void gspca_vm_close(struct vm_area_struct *vma)
95 {
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 if (--frame->vma_use_count <= 0)
99 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static struct vm_operations_struct gspca_vm_ops = {
103 .open = gspca_vm_open,
104 .close = gspca_vm_close,
105 };
106
107 /* get the current input frame buffer */
108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 {
110 struct gspca_frame *frame;
111 int i;
112
113 i = gspca_dev->fr_i;
114 i = gspca_dev->fr_queue[i];
115 frame = &gspca_dev->frame[i];
116 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117 != V4L2_BUF_FLAG_QUEUED)
118 return NULL;
119 return frame;
120 }
121 EXPORT_SYMBOL(gspca_get_i_frame);
122
123 /*
124 * fill a video frame from an URB and resubmit
125 */
126 static void fill_frame(struct gspca_dev *gspca_dev,
127 struct urb *urb)
128 {
129 struct gspca_frame *frame;
130 __u8 *data; /* address of data in the iso message */
131 int i, len, st;
132 cam_pkt_op pkt_scan;
133
134 if (urb->status != 0) {
135 #ifdef CONFIG_PM
136 if (!gspca_dev->frozen)
137 #endif
138 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
139 return; /* disconnection ? */
140 }
141 pkt_scan = gspca_dev->sd_desc->pkt_scan;
142 for (i = 0; i < urb->number_of_packets; i++) {
143
144 /* check the availability of the frame buffer */
145 frame = gspca_get_i_frame(gspca_dev);
146 if (!frame) {
147 gspca_dev->last_packet_type = DISCARD_PACKET;
148 break;
149 }
150
151 /* check the packet status and length */
152 len = urb->iso_frame_desc[i].actual_length;
153 if (len == 0)
154 continue;
155 st = urb->iso_frame_desc[i].status;
156 if (st) {
157 PDEBUG(D_ERR,
158 "ISOC data error: [%d] len=%d, status=%d",
159 i, len, st);
160 gspca_dev->last_packet_type = DISCARD_PACKET;
161 continue;
162 }
163
164 /* let the packet be analyzed by the subdriver */
165 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
166 i, urb->iso_frame_desc[i].offset, len);
167 data = (__u8 *) urb->transfer_buffer
168 + urb->iso_frame_desc[i].offset;
169 pkt_scan(gspca_dev, frame, data, len);
170 }
171
172 /* resubmit the URB */
173 urb->status = 0;
174 st = usb_submit_urb(urb, GFP_ATOMIC);
175 if (st < 0)
176 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
177 }
178
179 /*
180 * ISOC message interrupt from the USB device
181 *
182 * Analyse each packet and call the subdriver for copy to the frame buffer.
183 */
184 static void isoc_irq(struct urb *urb
185 )
186 {
187 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
188
189 PDEBUG(D_PACK, "isoc irq");
190 if (!gspca_dev->streaming)
191 return;
192 fill_frame(gspca_dev, urb);
193 }
194
195 /*
196 * bulk message interrupt from the USB device
197 */
198 static void bulk_irq(struct urb *urb
199 )
200 {
201 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
202 struct gspca_frame *frame;
203
204 PDEBUG(D_PACK, "bulk irq");
205 if (!gspca_dev->streaming)
206 return;
207 if (urb->status != 0 && urb->status != -ECONNRESET) {
208 #ifdef CONFIG_PM
209 if (!gspca_dev->frozen)
210 #endif
211 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
212 return; /* disconnection ? */
213 }
214
215 /* check the availability of the frame buffer */
216 frame = gspca_get_i_frame(gspca_dev);
217 if (!frame) {
218 gspca_dev->last_packet_type = DISCARD_PACKET;
219 } else {
220 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
221 gspca_dev->sd_desc->pkt_scan(gspca_dev,
222 frame,
223 urb->transfer_buffer,
224 urb->actual_length);
225 }
226 }
227
228 /*
229 * add data to the current frame
230 *
231 * This function is called by the subdrivers at interrupt level.
232 *
233 * To build a frame, these ones must add
234 * - one FIRST_PACKET
235 * - 0 or many INTER_PACKETs
236 * - one LAST_PACKET
237 * DISCARD_PACKET invalidates the whole frame.
238 * On LAST_PACKET, a new frame is returned.
239 */
240 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
241 enum gspca_packet_type packet_type,
242 struct gspca_frame *frame,
243 const __u8 *data,
244 int len)
245 {
246 int i, j;
247
248 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
249
250 /* when start of a new frame, if the current frame buffer
251 * is not queued, discard the whole frame */
252 if (packet_type == FIRST_PACKET) {
253 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
254 != V4L2_BUF_FLAG_QUEUED) {
255 gspca_dev->last_packet_type = DISCARD_PACKET;
256 return frame;
257 }
258 frame->data_end = frame->data;
259 jiffies_to_timeval(get_jiffies_64(),
260 &frame->v4l2_buf.timestamp);
261 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
262 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
263 if (packet_type == LAST_PACKET)
264 gspca_dev->last_packet_type = packet_type;
265 return frame;
266 }
267
268 /* append the packet to the frame buffer */
269 if (len > 0) {
270 if (frame->data_end - frame->data + len
271 > frame->v4l2_buf.length) {
272 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
273 frame->data_end - frame->data + len,
274 frame->v4l2_buf.length);
275 packet_type = DISCARD_PACKET;
276 } else {
277 memcpy(frame->data_end, data, len);
278 frame->data_end += len;
279 }
280 }
281 gspca_dev->last_packet_type = packet_type;
282
283 /* if last packet, wake up the application and advance in the queue */
284 if (packet_type == LAST_PACKET) {
285 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
286 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
287 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
288 atomic_inc(&gspca_dev->nevent);
289 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
290 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
291 gspca_dev->fr_i = i;
292 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
293 frame->v4l2_buf.bytesused,
294 gspca_dev->fr_q,
295 i,
296 gspca_dev->fr_o);
297 j = gspca_dev->fr_queue[i];
298 frame = &gspca_dev->frame[j];
299 }
300 return frame;
301 }
302 EXPORT_SYMBOL(gspca_frame_add);
303
304 static int gspca_is_compressed(__u32 format)
305 {
306 switch (format) {
307 case V4L2_PIX_FMT_MJPEG:
308 case V4L2_PIX_FMT_JPEG:
309 case V4L2_PIX_FMT_SPCA561:
310 case V4L2_PIX_FMT_PAC207:
311 return 1;
312 }
313 return 0;
314 }
315
316 static void *rvmalloc(unsigned long size)
317 {
318 void *mem;
319 unsigned long adr;
320
321 mem = vmalloc_32(size);
322 if (mem != NULL) {
323 adr = (unsigned long) mem;
324 while ((long) size > 0) {
325 SetPageReserved(vmalloc_to_page((void *) adr));
326 adr += PAGE_SIZE;
327 size -= PAGE_SIZE;
328 }
329 }
330 return mem;
331 }
332
333 static void rvfree(void *mem, long size)
334 {
335 unsigned long adr;
336
337 adr = (unsigned long) mem;
338 while (size > 0) {
339 ClearPageReserved(vmalloc_to_page((void *) adr));
340 adr += PAGE_SIZE;
341 size -= PAGE_SIZE;
342 }
343 vfree(mem);
344 }
345
346 static int frame_alloc(struct gspca_dev *gspca_dev,
347 unsigned int count)
348 {
349 struct gspca_frame *frame;
350 unsigned int frsz;
351 int i;
352
353 i = gspca_dev->curr_mode;
354 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
355 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
356 frsz = PAGE_ALIGN(frsz);
357 gspca_dev->frsz = frsz;
358 if (count > GSPCA_MAX_FRAMES)
359 count = GSPCA_MAX_FRAMES;
360 gspca_dev->frbuf = rvmalloc(frsz * count);
361 if (!gspca_dev->frbuf) {
362 err("frame alloc failed");
363 return -ENOMEM;
364 }
365 gspca_dev->nframes = count;
366 for (i = 0; i < count; i++) {
367 frame = &gspca_dev->frame[i];
368 frame->v4l2_buf.index = i;
369 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
370 frame->v4l2_buf.flags = 0;
371 frame->v4l2_buf.field = V4L2_FIELD_NONE;
372 frame->v4l2_buf.length = frsz;
373 frame->v4l2_buf.memory = gspca_dev->memory;
374 frame->v4l2_buf.sequence = 0;
375 frame->data = frame->data_end =
376 gspca_dev->frbuf + i * frsz;
377 frame->v4l2_buf.m.offset = i * frsz;
378 }
379 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
380 gspca_dev->last_packet_type = DISCARD_PACKET;
381 gspca_dev->sequence = 0;
382 atomic_set(&gspca_dev->nevent, 0);
383 return 0;
384 }
385
386 static void frame_free(struct gspca_dev *gspca_dev)
387 {
388 int i;
389
390 PDEBUG(D_STREAM, "frame free");
391 if (gspca_dev->frbuf != NULL) {
392 rvfree(gspca_dev->frbuf,
393 gspca_dev->nframes * gspca_dev->frsz);
394 gspca_dev->frbuf = NULL;
395 for (i = 0; i < gspca_dev->nframes; i++)
396 gspca_dev->frame[i].data = NULL;
397 }
398 gspca_dev->nframes = 0;
399 }
400
401 static void destroy_urbs(struct gspca_dev *gspca_dev)
402 {
403 struct urb *urb;
404 unsigned int i;
405
406 PDEBUG(D_STREAM, "kill transfer");
407 for (i = 0; i < MAX_NURBS; i++) {
408 urb = gspca_dev->urb[i];
409 if (urb == NULL)
410 break;
411
412 gspca_dev->urb[i] = NULL;
413 usb_kill_urb(urb);
414 if (urb->transfer_buffer != NULL)
415 usb_buffer_free(gspca_dev->dev,
416 urb->transfer_buffer_length,
417 urb->transfer_buffer,
418 urb->transfer_dma);
419 usb_free_urb(urb);
420 }
421 }
422
423 /*
424 * look for an input transfer endpoint in an alternate setting
425 */
426 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
427 __u8 epaddr,
428 __u8 xfer)
429 {
430 struct usb_host_endpoint *ep;
431 int i, attr;
432
433 epaddr |= USB_DIR_IN;
434 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
435 ep = &alt->endpoint[i];
436 if (ep->desc.bEndpointAddress == epaddr) {
437 attr = ep->desc.bmAttributes
438 & USB_ENDPOINT_XFERTYPE_MASK;
439 if (attr == xfer)
440 return ep;
441 break;
442 }
443 }
444 return NULL;
445 }
446
447 /*
448 * look for an input (isoc or bulk) endpoint
449 *
450 * The endpoint is defined by the subdriver.
451 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
452 * This routine may be called many times when the bandwidth is too small
453 * (the bandwidth is checked on urb submit).
454 */
455 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
456 {
457 struct usb_interface *intf;
458 struct usb_host_endpoint *ep;
459 int i, ret;
460
461 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
462 ep = NULL;
463 i = gspca_dev->alt; /* previous alt setting */
464
465 /* try isoc */
466 while (--i > 0) { /* alt 0 is unusable */
467 ep = alt_xfer(&intf->altsetting[i],
468 gspca_dev->cam.epaddr,
469 USB_ENDPOINT_XFER_ISOC);
470 if (ep)
471 break;
472 }
473
474 /* if no isoc, try bulk */
475 if (ep == NULL) {
476 ep = alt_xfer(&intf->altsetting[0],
477 gspca_dev->cam.epaddr,
478 USB_ENDPOINT_XFER_BULK);
479 if (ep == NULL) {
480 err("no transfer endpoint found");
481 return NULL;
482 }
483 }
484 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
485 i, ep->desc.bEndpointAddress);
486 if (i > 0) {
487 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
488 if (ret < 0) {
489 err("set interface err %d", ret);
490 return NULL;
491 }
492 }
493 gspca_dev->alt = i; /* memorize the current alt setting */
494 return ep;
495 }
496
497 /*
498 * create the URBs for image transfer
499 */
500 static int create_urbs(struct gspca_dev *gspca_dev,
501 struct usb_host_endpoint *ep)
502 {
503 struct urb *urb;
504 int n, nurbs, i, psize, npkt, bsize;
505
506 /* calculate the packet size and the number of packets */
507 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
508
509 if (gspca_dev->alt != 0) { /* isoc */
510
511 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
512 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
513 npkt = ISO_MAX_SIZE / psize;
514 if (npkt > ISO_MAX_PKT)
515 npkt = ISO_MAX_PKT;
516 bsize = psize * npkt;
517 PDEBUG(D_STREAM,
518 "isoc %d pkts size %d = bsize:%d",
519 npkt, psize, bsize);
520 nurbs = DEF_NURBS;
521 } else { /* bulk */
522 npkt = 0;
523 bsize = gspca_dev->cam. bulk_size;
524 if (bsize == 0)
525 bsize = psize;
526 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
527 nurbs = 1;
528 }
529
530 gspca_dev->nurbs = nurbs;
531 for (n = 0; n < nurbs; n++) {
532 urb = usb_alloc_urb(npkt, GFP_KERNEL);
533 if (!urb) {
534 err("usb_alloc_urb failed");
535 destroy_urbs(gspca_dev);
536 return -ENOMEM;
537 }
538 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
539 bsize,
540 GFP_KERNEL,
541 &urb->transfer_dma);
542
543 if (urb->transfer_buffer == NULL) {
544 usb_free_urb(urb);
545 err("usb_buffer_urb failed");
546 destroy_urbs(gspca_dev);
547 return -ENOMEM;
548 }
549 gspca_dev->urb[n] = urb;
550 urb->dev = gspca_dev->dev;
551 urb->context = gspca_dev;
552 urb->transfer_buffer_length = bsize;
553 if (npkt != 0) { /* ISOC */
554 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
555 ep->desc.bEndpointAddress);
556 urb->transfer_flags = URB_ISO_ASAP
557 | URB_NO_TRANSFER_DMA_MAP;
558 urb->interval = ep->desc.bInterval;
559 urb->complete = isoc_irq;
560 urb->number_of_packets = npkt;
561 for (i = 0; i < npkt; i++) {
562 urb->iso_frame_desc[i].length = psize;
563 urb->iso_frame_desc[i].offset = psize * i;
564 }
565 } else { /* bulk */
566 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
567 ep->desc.bEndpointAddress),
568 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
569 urb->complete = bulk_irq;
570 }
571 }
572 return 0;
573 }
574
575 /*
576 * start the USB transfer
577 */
578 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
579 {
580 struct usb_host_endpoint *ep;
581 int n, ret;
582
583 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
584 return -ERESTARTSYS;
585
586 /* set the higher alternate setting and
587 * loop until urb submit succeeds */
588 gspca_dev->alt = gspca_dev->nbalt;
589 for (;;) {
590 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
591 ep = get_ep(gspca_dev);
592 if (ep == NULL) {
593 ret = -EIO;
594 goto out;
595 }
596 ret = create_urbs(gspca_dev, ep);
597 if (ret < 0)
598 goto out;
599
600 /* start the cam */
601 ret = gspca_dev->sd_desc->start(gspca_dev);
602 if (ret < 0) {
603 destroy_urbs(gspca_dev);
604 goto out;
605 }
606 gspca_dev->streaming = 1;
607 atomic_set(&gspca_dev->nevent, 0);
608
609 /* bulk transfers are started by the subdriver */
610 if (gspca_dev->alt == 0)
611 break;
612
613 /* submit the URBs */
614 for (n = 0; n < gspca_dev->nurbs; n++) {
615 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
616 if (ret < 0) {
617 PDEBUG(D_ERR|D_STREAM,
618 "usb_submit_urb [%d] err %d", n, ret);
619 gspca_dev->streaming = 0;
620 destroy_urbs(gspca_dev);
621 if (ret == -ENOSPC)
622 break; /* try the previous alt */
623 goto out;
624 }
625 }
626 if (ret >= 0)
627 break;
628 }
629 out:
630 mutex_unlock(&gspca_dev->usb_lock);
631 return ret;
632 }
633
634 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
635 {
636 int ret;
637
638 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
639 if (ret < 0)
640 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
641 return ret;
642 }
643
644 /* Note: both the queue and the usb locks should be held when calling this */
645 static void gspca_stream_off(struct gspca_dev *gspca_dev)
646 {
647 gspca_dev->streaming = 0;
648 atomic_set(&gspca_dev->nevent, 0);
649 if (gspca_dev->present) {
650 if (gspca_dev->sd_desc->stopN)
651 gspca_dev->sd_desc->stopN(gspca_dev);
652 destroy_urbs(gspca_dev);
653 gspca_set_alt0(gspca_dev);
654 if (gspca_dev->sd_desc->stop0)
655 gspca_dev->sd_desc->stop0(gspca_dev);
656 PDEBUG(D_STREAM, "stream off OK");
657 }
658 }
659
660 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
661 {
662 int i;
663
664 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
665 gspca_dev->curr_mode = i;
666 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
667 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
668 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
669 }
670
671 static int wxh_to_mode(struct gspca_dev *gspca_dev,
672 int width, int height)
673 {
674 int i;
675
676 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
677 if (width >= gspca_dev->cam.cam_mode[i].width
678 && height >= gspca_dev->cam.cam_mode[i].height)
679 break;
680 }
681 return i;
682 }
683
684 /*
685 * search a mode with the right pixel format
686 */
687 static int gspca_get_mode(struct gspca_dev *gspca_dev,
688 int mode,
689 int pixfmt)
690 {
691 int modeU, modeD;
692
693 modeU = modeD = mode;
694 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
695 if (--modeD >= 0) {
696 if (gspca_dev->cam.cam_mode[modeD].pixelformat
697 == pixfmt)
698 return modeD;
699 }
700 if (++modeU < gspca_dev->cam.nmodes) {
701 if (gspca_dev->cam.cam_mode[modeU].pixelformat
702 == pixfmt)
703 return modeU;
704 }
705 }
706 return -EINVAL;
707 }
708
709 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
710 struct v4l2_fmtdesc *fmtdesc)
711 {
712 struct gspca_dev *gspca_dev = priv;
713 int i, j, index;
714 __u32 fmt_tb[8];
715
716 /* give an index to each format */
717 index = 0;
718 j = 0;
719 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
720 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
721 j = 0;
722 for (;;) {
723 if (fmt_tb[j] == fmt_tb[index])
724 break;
725 j++;
726 }
727 if (j == index) {
728 if (fmtdesc->index == index)
729 break; /* new format */
730 index++;
731 if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
732 return -EINVAL;
733 }
734 }
735 if (i < 0)
736 return -EINVAL; /* no more format */
737
738 fmtdesc->pixelformat = fmt_tb[index];
739 if (gspca_is_compressed(fmt_tb[index]))
740 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
741 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
742 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
743 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
744 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
745 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
746 fmtdesc->description[4] = '\0';
747 return 0;
748 }
749
750 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
751 struct v4l2_format *fmt)
752 {
753 struct gspca_dev *gspca_dev = priv;
754 int mode;
755
756 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
757 return -EINVAL;
758 mode = gspca_dev->curr_mode;
759 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
760 sizeof fmt->fmt.pix);
761 return 0;
762 }
763
764 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
765 struct v4l2_format *fmt)
766 {
767 int w, h, mode, mode2;
768
769 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
770 return -EINVAL;
771 w = fmt->fmt.pix.width;
772 h = fmt->fmt.pix.height;
773
774 #ifdef GSPCA_DEBUG
775 if (gspca_debug & D_CONF)
776 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
777 #endif
778 /* search the closest mode for width and height */
779 mode = wxh_to_mode(gspca_dev, w, h);
780
781 /* OK if right palette */
782 if (gspca_dev->cam.cam_mode[mode].pixelformat
783 != fmt->fmt.pix.pixelformat) {
784
785 /* else, search the closest mode with the same pixel format */
786 mode2 = gspca_get_mode(gspca_dev, mode,
787 fmt->fmt.pix.pixelformat);
788 if (mode2 >= 0)
789 mode = mode2;
790 /* else
791 ; * no chance, return this mode */
792 }
793 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
794 sizeof fmt->fmt.pix);
795 return mode; /* used when s_fmt */
796 }
797
798 static int vidioc_try_fmt_vid_cap(struct file *file,
799 void *priv,
800 struct v4l2_format *fmt)
801 {
802 struct gspca_dev *gspca_dev = priv;
803 int ret;
804
805 ret = try_fmt_vid_cap(gspca_dev, fmt);
806 if (ret < 0)
807 return ret;
808 return 0;
809 }
810
811 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
812 struct v4l2_format *fmt)
813 {
814 struct gspca_dev *gspca_dev = priv;
815 int ret;
816
817 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
818 return -ERESTARTSYS;
819
820 ret = try_fmt_vid_cap(gspca_dev, fmt);
821 if (ret < 0)
822 goto out;
823
824 if (gspca_dev->nframes != 0
825 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
826 ret = -EINVAL;
827 goto out;
828 }
829
830 if (ret == gspca_dev->curr_mode) {
831 ret = 0;
832 goto out; /* same mode */
833 }
834
835 if (gspca_dev->streaming) {
836 ret = -EBUSY;
837 goto out;
838 }
839 gspca_dev->width = fmt->fmt.pix.width;
840 gspca_dev->height = fmt->fmt.pix.height;
841 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
842 gspca_dev->curr_mode = ret;
843
844 ret = 0;
845 out:
846 mutex_unlock(&gspca_dev->queue_lock);
847 return ret;
848 }
849
850 static void gspca_delete(struct kref *kref)
851 {
852 struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
853
854 PDEBUG(D_STREAM, "device deleted");
855
856 kfree(gspca_dev->usb_buf);
857 kfree(gspca_dev);
858 }
859
860 static int dev_open(struct inode *inode, struct file *file)
861 {
862 struct gspca_dev *gspca_dev;
863 int ret;
864
865 PDEBUG(D_STREAM, "%s open", current->comm);
866 gspca_dev = (struct gspca_dev *) video_devdata(file);
867 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
868 return -ERESTARTSYS;
869 if (!gspca_dev->present) {
870 ret = -ENODEV;
871 goto out;
872 }
873
874 if (gspca_dev->users > 4) { /* (arbitrary value) */
875 ret = -EBUSY;
876 goto out;
877 }
878 gspca_dev->users++;
879
880 /* one more user */
881 kref_get(&gspca_dev->kref);
882
883 file->private_data = gspca_dev;
884 #ifdef GSPCA_DEBUG
885 /* activate the v4l2 debug */
886 if (gspca_debug & D_V4L2)
887 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
888 | V4L2_DEBUG_IOCTL_ARG;
889 else
890 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
891 | V4L2_DEBUG_IOCTL_ARG);
892 #endif
893 ret = 0;
894 out:
895 mutex_unlock(&gspca_dev->queue_lock);
896 if (ret != 0)
897 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
898 else
899 PDEBUG(D_STREAM, "open done");
900 return ret;
901 }
902
903 static int dev_close(struct inode *inode, struct file *file)
904 {
905 struct gspca_dev *gspca_dev = file->private_data;
906
907 PDEBUG(D_STREAM, "%s close", current->comm);
908 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
909 return -ERESTARTSYS;
910 gspca_dev->users--;
911
912 /* if the file did the capture, free the streaming resources */
913 if (gspca_dev->capt_file == file) {
914 if (gspca_dev->streaming) {
915 mutex_lock(&gspca_dev->usb_lock);
916 gspca_stream_off(gspca_dev);
917 mutex_unlock(&gspca_dev->usb_lock);
918 }
919 frame_free(gspca_dev);
920 gspca_dev->capt_file = NULL;
921 gspca_dev->memory = GSPCA_MEMORY_NO;
922 }
923 file->private_data = NULL;
924 mutex_unlock(&gspca_dev->queue_lock);
925
926 PDEBUG(D_STREAM, "close done");
927
928 kref_put(&gspca_dev->kref, gspca_delete);
929
930 return 0;
931 }
932
933 static int vidioc_querycap(struct file *file, void *priv,
934 struct v4l2_capability *cap)
935 {
936 struct gspca_dev *gspca_dev = priv;
937
938 memset(cap, 0, sizeof *cap);
939 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
940 if (gspca_dev->dev->product != NULL) {
941 strncpy(cap->card, gspca_dev->dev->product,
942 sizeof cap->card);
943 } else {
944 snprintf(cap->card, sizeof cap->card,
945 "USB Camera (%04x:%04x)",
946 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
947 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
948 }
949 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
950 sizeof cap->bus_info);
951 cap->version = DRIVER_VERSION_NUMBER;
952 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
953 | V4L2_CAP_STREAMING
954 | V4L2_CAP_READWRITE;
955 return 0;
956 }
957
958 static int vidioc_queryctrl(struct file *file, void *priv,
959 struct v4l2_queryctrl *q_ctrl)
960 {
961 struct gspca_dev *gspca_dev = priv;
962 int i, ix;
963 u32 id;
964
965 ix = -1;
966 id = q_ctrl->id;
967 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
968 id &= V4L2_CTRL_ID_MASK;
969 id++;
970 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
971 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
972 continue;
973 if (ix < 0) {
974 ix = i;
975 continue;
976 }
977 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
978 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
979 continue;
980 ix = i;
981 }
982 }
983 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
984 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
985 ix = i;
986 break;
987 }
988 }
989 if (ix < 0)
990 return -EINVAL;
991 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
992 sizeof *q_ctrl);
993 if (gspca_dev->ctrl_dis & (1 << ix))
994 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
995 return 0;
996 }
997
998 static int vidioc_s_ctrl(struct file *file, void *priv,
999 struct v4l2_control *ctrl)
1000 {
1001 struct gspca_dev *gspca_dev = priv;
1002 const struct ctrl *ctrls;
1003 int i, ret;
1004
1005 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1006 i < gspca_dev->sd_desc->nctrls;
1007 i++, ctrls++) {
1008 if (ctrl->id != ctrls->qctrl.id)
1009 continue;
1010 if (gspca_dev->ctrl_dis & (1 << i))
1011 return -EINVAL;
1012 if (ctrl->value < ctrls->qctrl.minimum
1013 || ctrl->value > ctrls->qctrl.maximum)
1014 return -ERANGE;
1015 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1016 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1017 return -ERESTARTSYS;
1018 ret = ctrls->set(gspca_dev, ctrl->value);
1019 mutex_unlock(&gspca_dev->usb_lock);
1020 return ret;
1021 }
1022 return -EINVAL;
1023 }
1024
1025 static int vidioc_g_ctrl(struct file *file, void *priv,
1026 struct v4l2_control *ctrl)
1027 {
1028 struct gspca_dev *gspca_dev = priv;
1029
1030 const struct ctrl *ctrls;
1031 int i, ret;
1032
1033 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1034 i < gspca_dev->sd_desc->nctrls;
1035 i++, ctrls++) {
1036 if (ctrl->id != ctrls->qctrl.id)
1037 continue;
1038 if (gspca_dev->ctrl_dis & (1 << i))
1039 return -EINVAL;
1040 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1041 return -ERESTARTSYS;
1042 ret = ctrls->get(gspca_dev, &ctrl->value);
1043 mutex_unlock(&gspca_dev->usb_lock);
1044 return ret;
1045 }
1046 return -EINVAL;
1047 }
1048
1049 static int vidioc_querymenu(struct file *file, void *priv,
1050 struct v4l2_querymenu *qmenu)
1051 {
1052 struct gspca_dev *gspca_dev = priv;
1053
1054 if (!gspca_dev->sd_desc->querymenu)
1055 return -EINVAL;
1056 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1057 }
1058
1059 static int vidioc_enum_input(struct file *file, void *priv,
1060 struct v4l2_input *input)
1061 {
1062 struct gspca_dev *gspca_dev = priv;
1063
1064 if (input->index != 0)
1065 return -EINVAL;
1066 memset(input, 0, sizeof *input);
1067 input->type = V4L2_INPUT_TYPE_CAMERA;
1068 strncpy(input->name, gspca_dev->sd_desc->name,
1069 sizeof input->name);
1070 return 0;
1071 }
1072
1073 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1074 {
1075 *i = 0;
1076 return 0;
1077 }
1078
1079 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1080 {
1081 if (i > 0)
1082 return -EINVAL;
1083 return (0);
1084 }
1085
1086 static int vidioc_reqbufs(struct file *file, void *priv,
1087 struct v4l2_requestbuffers *rb)
1088 {
1089 struct gspca_dev *gspca_dev = priv;
1090 int i, ret = 0;
1091
1092 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1093 return -EINVAL;
1094 switch (rb->memory) {
1095 case GSPCA_MEMORY_READ: /* (internal call) */
1096 case V4L2_MEMORY_MMAP:
1097 case V4L2_MEMORY_USERPTR:
1098 break;
1099 default:
1100 return -EINVAL;
1101 }
1102 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1103 return -ERESTARTSYS;
1104
1105 if (gspca_dev->memory != GSPCA_MEMORY_NO
1106 && gspca_dev->memory != rb->memory) {
1107 ret = -EBUSY;
1108 goto out;
1109 }
1110
1111 /* only one file may do the capture */
1112 if (gspca_dev->capt_file != NULL
1113 && gspca_dev->capt_file != file) {
1114 ret = -EBUSY;
1115 goto out;
1116 }
1117
1118 /* if allocated, the buffers must not be mapped */
1119 for (i = 0; i < gspca_dev->nframes; i++) {
1120 if (gspca_dev->frame[i].vma_use_count) {
1121 ret = -EBUSY;
1122 goto out;
1123 }
1124 }
1125
1126 /* stop streaming */
1127 if (gspca_dev->streaming) {
1128 mutex_lock(&gspca_dev->usb_lock);
1129 gspca_stream_off(gspca_dev);
1130 mutex_unlock(&gspca_dev->usb_lock);
1131 }
1132
1133 /* free the previous allocated buffers, if any */
1134 if (gspca_dev->nframes != 0) {
1135 frame_free(gspca_dev);
1136 gspca_dev->capt_file = NULL;
1137 }
1138 if (rb->count == 0) /* unrequest */
1139 goto out;
1140 gspca_dev->memory = rb->memory;
1141 ret = frame_alloc(gspca_dev, rb->count);
1142 if (ret == 0) {
1143 rb->count = gspca_dev->nframes;
1144 gspca_dev->capt_file = file;
1145 }
1146 out:
1147 mutex_unlock(&gspca_dev->queue_lock);
1148 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1149 return ret;
1150 }
1151
1152 static int vidioc_querybuf(struct file *file, void *priv,
1153 struct v4l2_buffer *v4l2_buf)
1154 {
1155 struct gspca_dev *gspca_dev = priv;
1156 struct gspca_frame *frame;
1157
1158 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1159 || v4l2_buf->index < 0
1160 || v4l2_buf->index >= gspca_dev->nframes)
1161 return -EINVAL;
1162
1163 frame = &gspca_dev->frame[v4l2_buf->index];
1164 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1165 return 0;
1166 }
1167
1168 static int vidioc_streamon(struct file *file, void *priv,
1169 enum v4l2_buf_type buf_type)
1170 {
1171 struct gspca_dev *gspca_dev = priv;
1172 int ret;
1173
1174 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1175 return -EINVAL;
1176 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1177 return -ERESTARTSYS;
1178 if (!gspca_dev->present) {
1179 ret = -ENODEV;
1180 goto out;
1181 }
1182 if (gspca_dev->nframes == 0) {
1183 ret = -EINVAL;
1184 goto out;
1185 }
1186 if (!gspca_dev->streaming) {
1187 ret = gspca_init_transfer(gspca_dev);
1188 if (ret < 0)
1189 goto out;
1190 }
1191 #ifdef GSPCA_DEBUG
1192 if (gspca_debug & D_STREAM) {
1193 PDEBUG_MODE("stream on OK",
1194 gspca_dev->pixfmt,
1195 gspca_dev->width,
1196 gspca_dev->height);
1197 }
1198 #endif
1199 ret = 0;
1200 out:
1201 mutex_unlock(&gspca_dev->queue_lock);
1202 return ret;
1203 }
1204
1205 static int vidioc_streamoff(struct file *file, void *priv,
1206 enum v4l2_buf_type buf_type)
1207 {
1208 struct gspca_dev *gspca_dev = priv;
1209 int i, ret;
1210
1211 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1212 return -EINVAL;
1213 if (!gspca_dev->streaming)
1214 return 0;
1215 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1216 return -ERESTARTSYS;
1217
1218 /* stop streaming */
1219 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1220 ret = -ERESTARTSYS;
1221 goto out;
1222 }
1223 gspca_stream_off(gspca_dev);
1224 mutex_unlock(&gspca_dev->usb_lock);
1225
1226 /* empty the application queues */
1227 for (i = 0; i < gspca_dev->nframes; i++)
1228 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1229 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1230 gspca_dev->last_packet_type = DISCARD_PACKET;
1231 gspca_dev->sequence = 0;
1232 atomic_set(&gspca_dev->nevent, 0);
1233 ret = 0;
1234 out:
1235 mutex_unlock(&gspca_dev->queue_lock);
1236 return ret;
1237 }
1238
1239 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1240 struct v4l2_jpegcompression *jpegcomp)
1241 {
1242 struct gspca_dev *gspca_dev = priv;
1243 int ret;
1244
1245 if (!gspca_dev->sd_desc->get_jcomp)
1246 return -EINVAL;
1247 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1248 return -ERESTARTSYS;
1249 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1250 mutex_unlock(&gspca_dev->usb_lock);
1251 return ret;
1252 }
1253
1254 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1255 struct v4l2_jpegcompression *jpegcomp)
1256 {
1257 struct gspca_dev *gspca_dev = priv;
1258 int ret;
1259
1260 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1261 return -ERESTARTSYS;
1262 if (!gspca_dev->sd_desc->set_jcomp)
1263 return -EINVAL;
1264 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1265 mutex_unlock(&gspca_dev->usb_lock);
1266 return ret;
1267 }
1268
1269 static int vidioc_g_parm(struct file *filp, void *priv,
1270 struct v4l2_streamparm *parm)
1271 {
1272 struct gspca_dev *gspca_dev = priv;
1273
1274 memset(parm, 0, sizeof *parm);
1275 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1276 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1277 return 0;
1278 }
1279
1280 static int vidioc_s_parm(struct file *filp, void *priv,
1281 struct v4l2_streamparm *parm)
1282 {
1283 struct gspca_dev *gspca_dev = priv;
1284 int n;
1285
1286 n = parm->parm.capture.readbuffers;
1287 if (n == 0 || n > GSPCA_MAX_FRAMES)
1288 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1289 else
1290 gspca_dev->nbufread = n;
1291 return 0;
1292 }
1293
1294 static int vidioc_s_std(struct file *filp, void *priv,
1295 v4l2_std_id *parm)
1296 {
1297 return 0;
1298 }
1299
1300 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1301 static int vidiocgmbuf(struct file *file, void *priv,
1302 struct video_mbuf *mbuf)
1303 {
1304 struct gspca_dev *gspca_dev = file->private_data;
1305 int i;
1306
1307 PDEBUG(D_STREAM, "cgmbuf");
1308 if (gspca_dev->nframes == 0) {
1309 int ret;
1310
1311 {
1312 struct v4l2_format fmt;
1313
1314 memset(&fmt, 0, sizeof fmt);
1315 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1316 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1317 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1318 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1319 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1320 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1321 if (ret != 0)
1322 return ret;
1323 }
1324 {
1325 struct v4l2_requestbuffers rb;
1326
1327 memset(&rb, 0, sizeof rb);
1328 rb.count = 4;
1329 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1330 rb.memory = V4L2_MEMORY_MMAP;
1331 ret = vidioc_reqbufs(file, priv, &rb);
1332 if (ret != 0)
1333 return ret;
1334 }
1335 }
1336 mbuf->frames = gspca_dev->nframes;
1337 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1338 for (i = 0; i < mbuf->frames; i++)
1339 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1340 return 0;
1341 }
1342 #endif
1343
1344 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1345 {
1346 struct gspca_dev *gspca_dev = file->private_data;
1347 struct gspca_frame *frame;
1348 struct page *page;
1349 unsigned long addr, start, size;
1350 int i, ret;
1351
1352 start = vma->vm_start;
1353 size = vma->vm_end - vma->vm_start;
1354 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1355
1356 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1357 return -ERESTARTSYS;
1358 if (!gspca_dev->present) {
1359 ret = -ENODEV;
1360 goto out;
1361 }
1362 if (gspca_dev->capt_file != file) {
1363 ret = -EINVAL;
1364 goto out;
1365 }
1366
1367 frame = NULL;
1368 for (i = 0; i < gspca_dev->nframes; ++i) {
1369 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1370 PDEBUG(D_STREAM, "mmap bad memory type");
1371 break;
1372 }
1373 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1374 == vma->vm_pgoff) {
1375 frame = &gspca_dev->frame[i];
1376 break;
1377 }
1378 }
1379 if (frame == NULL) {
1380 PDEBUG(D_STREAM, "mmap no frame buffer found");
1381 ret = -EINVAL;
1382 goto out;
1383 }
1384 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1385 /* v4l1 maps all the buffers */
1386 if (i != 0
1387 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1388 #endif
1389 if (size != frame->v4l2_buf.length) {
1390 PDEBUG(D_STREAM, "mmap bad size");
1391 ret = -EINVAL;
1392 goto out;
1393 }
1394
1395 /*
1396 * - VM_IO marks the area as being a mmaped region for I/O to a
1397 * device. It also prevents the region from being core dumped.
1398 */
1399 vma->vm_flags |= VM_IO;
1400
1401 addr = (unsigned long) frame->data;
1402 while (size > 0) {
1403 page = vmalloc_to_page((void *) addr);
1404 ret = vm_insert_page(vma, start, page);
1405 if (ret < 0)
1406 goto out;
1407 start += PAGE_SIZE;
1408 addr += PAGE_SIZE;
1409 size -= PAGE_SIZE;
1410 }
1411
1412 vma->vm_ops = &gspca_vm_ops;
1413 vma->vm_private_data = frame;
1414 gspca_vm_open(vma);
1415 ret = 0;
1416 out:
1417 mutex_unlock(&gspca_dev->queue_lock);
1418 return ret;
1419 }
1420
1421 /*
1422 * wait for a video frame
1423 *
1424 * If a frame is ready, its index is returned.
1425 */
1426 static int frame_wait(struct gspca_dev *gspca_dev,
1427 int nonblock_ing)
1428 {
1429 struct gspca_frame *frame;
1430 int i, j, ret;
1431
1432 /* check if a frame is ready */
1433 i = gspca_dev->fr_o;
1434 j = gspca_dev->fr_queue[i];
1435 frame = &gspca_dev->frame[j];
1436 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1437 atomic_dec(&gspca_dev->nevent);
1438 goto ok;
1439 }
1440 if (nonblock_ing) /* no frame yet */
1441 return -EAGAIN;
1442
1443 /* wait till a frame is ready */
1444 for (;;) {
1445 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1446 atomic_read(&gspca_dev->nevent) > 0,
1447 msecs_to_jiffies(3000));
1448 if (ret <= 0) {
1449 if (ret < 0)
1450 return ret; /* interrupt */
1451 return -EIO; /* timeout */
1452 }
1453 atomic_dec(&gspca_dev->nevent);
1454 if (!gspca_dev->streaming || !gspca_dev->present)
1455 return -EIO;
1456 i = gspca_dev->fr_o;
1457 j = gspca_dev->fr_queue[i];
1458 frame = &gspca_dev->frame[j];
1459 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1460 break;
1461 }
1462 ok:
1463 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1464 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1465 gspca_dev->fr_q,
1466 gspca_dev->fr_i,
1467 gspca_dev->fr_o);
1468
1469 if (gspca_dev->sd_desc->dq_callback) {
1470 mutex_lock(&gspca_dev->usb_lock);
1471 gspca_dev->sd_desc->dq_callback(gspca_dev);
1472 mutex_unlock(&gspca_dev->usb_lock);
1473 }
1474 return j;
1475 }
1476
1477 /*
1478 * dequeue a video buffer
1479 *
1480 * If nonblock_ing is false, block until a buffer is available.
1481 */
1482 static int vidioc_dqbuf(struct file *file, void *priv,
1483 struct v4l2_buffer *v4l2_buf)
1484 {
1485 struct gspca_dev *gspca_dev = priv;
1486 struct gspca_frame *frame;
1487 int i, ret;
1488
1489 PDEBUG(D_FRAM, "dqbuf");
1490 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1491 return -EINVAL;
1492 if (v4l2_buf->memory != gspca_dev->memory)
1493 return -EINVAL;
1494
1495 /* if not streaming, be sure the application will not loop forever */
1496 if (!(file->f_flags & O_NONBLOCK)
1497 && !gspca_dev->streaming && gspca_dev->users == 1)
1498 return -EINVAL;
1499
1500 /* only the capturing file may dequeue */
1501 if (gspca_dev->capt_file != file)
1502 return -EINVAL;
1503
1504 /* only one dequeue / read at a time */
1505 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1506 return -ERESTARTSYS;
1507
1508 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1509 if (ret < 0)
1510 goto out;
1511 i = ret; /* frame index */
1512 frame = &gspca_dev->frame[i];
1513 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1514 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1515 frame->data,
1516 frame->v4l2_buf.bytesused)) {
1517 PDEBUG(D_ERR|D_STREAM,
1518 "dqbuf cp to user failed");
1519 ret = -EFAULT;
1520 goto out;
1521 }
1522 }
1523 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1524 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1525 PDEBUG(D_FRAM, "dqbuf %d", i);
1526 ret = 0;
1527 out:
1528 mutex_unlock(&gspca_dev->read_lock);
1529 return ret;
1530 }
1531
1532 /*
1533 * queue a video buffer
1534 *
1535 * Attempting to queue a buffer that has already been
1536 * queued will return -EINVAL.
1537 */
1538 static int vidioc_qbuf(struct file *file, void *priv,
1539 struct v4l2_buffer *v4l2_buf)
1540 {
1541 struct gspca_dev *gspca_dev = priv;
1542 struct gspca_frame *frame;
1543 int i, index, ret;
1544
1545 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1546 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1547 return -EINVAL;
1548
1549 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1550 return -ERESTARTSYS;
1551
1552 index = v4l2_buf->index;
1553 if ((unsigned) index >= gspca_dev->nframes) {
1554 PDEBUG(D_FRAM,
1555 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1556 ret = -EINVAL;
1557 goto out;
1558 }
1559 if (v4l2_buf->memory != gspca_dev->memory) {
1560 PDEBUG(D_FRAM, "qbuf bad memory type");
1561 ret = -EINVAL;
1562 goto out;
1563 }
1564
1565 frame = &gspca_dev->frame[index];
1566 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1567 PDEBUG(D_FRAM, "qbuf bad state");
1568 ret = -EINVAL;
1569 goto out;
1570 }
1571
1572 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1573
1574 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1575 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1576 frame->v4l2_buf.length = v4l2_buf->length;
1577 }
1578
1579 /* put the buffer in the 'queued' queue */
1580 i = gspca_dev->fr_q;
1581 gspca_dev->fr_queue[i] = index;
1582 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1583 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1584 gspca_dev->fr_q,
1585 gspca_dev->fr_i,
1586 gspca_dev->fr_o);
1587
1588 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1589 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1590 ret = 0;
1591 out:
1592 mutex_unlock(&gspca_dev->queue_lock);
1593 return ret;
1594 }
1595
1596 /*
1597 * allocate the resources for read()
1598 */
1599 static int read_alloc(struct gspca_dev *gspca_dev,
1600 struct file *file)
1601 {
1602 struct v4l2_buffer v4l2_buf;
1603 int i, ret;
1604
1605 PDEBUG(D_STREAM, "read alloc");
1606 if (gspca_dev->nframes == 0) {
1607 struct v4l2_requestbuffers rb;
1608
1609 memset(&rb, 0, sizeof rb);
1610 rb.count = gspca_dev->nbufread;
1611 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1612 rb.memory = GSPCA_MEMORY_READ;
1613 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1614 if (ret != 0) {
1615 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1616 return ret;
1617 }
1618 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1619 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1620 v4l2_buf.memory = GSPCA_MEMORY_READ;
1621 for (i = 0; i < gspca_dev->nbufread; i++) {
1622 v4l2_buf.index = i;
1623 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1624 if (ret != 0) {
1625 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1626 return ret;
1627 }
1628 }
1629 gspca_dev->memory = GSPCA_MEMORY_READ;
1630 }
1631
1632 /* start streaming */
1633 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1634 if (ret != 0)
1635 PDEBUG(D_STREAM, "read streamon err %d", ret);
1636 return ret;
1637 }
1638
1639 static unsigned int dev_poll(struct file *file, poll_table *wait)
1640 {
1641 struct gspca_dev *gspca_dev = file->private_data;
1642 int i, ret;
1643
1644 PDEBUG(D_FRAM, "poll");
1645
1646 poll_wait(file, &gspca_dev->wq, wait);
1647 if (!gspca_dev->present)
1648 return POLLERR;
1649
1650 /* if reqbufs is not done, the user would use read() */
1651 if (gspca_dev->nframes == 0) {
1652 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1653 return POLLERR; /* not the 1st time */
1654 ret = read_alloc(gspca_dev, file);
1655 if (ret != 0)
1656 return POLLERR;
1657 }
1658
1659 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1660 return POLLERR;
1661 if (!gspca_dev->present) {
1662 ret = POLLERR;
1663 goto out;
1664 }
1665
1666 /* check the next incoming buffer */
1667 i = gspca_dev->fr_o;
1668 i = gspca_dev->fr_queue[i];
1669 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1670 ret = POLLIN | POLLRDNORM; /* something to read */
1671 else
1672 ret = 0;
1673 out:
1674 mutex_unlock(&gspca_dev->queue_lock);
1675 return ret;
1676 }
1677
1678 static ssize_t dev_read(struct file *file, char __user *data,
1679 size_t count, loff_t *ppos)
1680 {
1681 struct gspca_dev *gspca_dev = file->private_data;
1682 struct gspca_frame *frame;
1683 struct v4l2_buffer v4l2_buf;
1684 struct timeval timestamp;
1685 int n, ret, ret2;
1686
1687 PDEBUG(D_FRAM, "read (%zd)", count);
1688 if (!gspca_dev->present)
1689 return -ENODEV;
1690 switch (gspca_dev->memory) {
1691 case GSPCA_MEMORY_NO: /* first time */
1692 ret = read_alloc(gspca_dev, file);
1693 if (ret != 0)
1694 return ret;
1695 break;
1696 case GSPCA_MEMORY_READ:
1697 if (gspca_dev->capt_file == file)
1698 break;
1699 /* fall thru */
1700 default:
1701 return -EINVAL;
1702 }
1703
1704 /* get a frame */
1705 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1706 timestamp.tv_sec--;
1707 n = 2;
1708 for (;;) {
1709 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1710 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1711 v4l2_buf.memory = GSPCA_MEMORY_READ;
1712 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1713 if (ret != 0) {
1714 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1715 return ret;
1716 }
1717
1718 /* if the process slept for more than 1 second,
1719 * get a newer frame */
1720 frame = &gspca_dev->frame[v4l2_buf.index];
1721 if (--n < 0)
1722 break; /* avoid infinite loop */
1723 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1724 break;
1725 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1726 if (ret != 0) {
1727 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1728 return ret;
1729 }
1730 }
1731
1732 /* copy the frame */
1733 if (count > frame->v4l2_buf.bytesused)
1734 count = frame->v4l2_buf.bytesused;
1735 ret = copy_to_user(data, frame->data, count);
1736 if (ret != 0) {
1737 PDEBUG(D_ERR|D_STREAM,
1738 "read cp to user lack %d / %zd", ret, count);
1739 ret = -EFAULT;
1740 goto out;
1741 }
1742 ret = count;
1743 out:
1744 /* in each case, requeue the buffer */
1745 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1746 if (ret2 != 0)
1747 return ret2;
1748 return ret;
1749 }
1750
1751 static void dev_release(struct video_device *vfd)
1752 {
1753 /* nothing */
1754 }
1755
1756 static struct file_operations dev_fops = {
1757 .owner = THIS_MODULE,
1758 .open = dev_open,
1759 .release = dev_close,
1760 .read = dev_read,
1761 .mmap = dev_mmap,
1762 .ioctl = video_ioctl2,
1763 #ifdef CONFIG_COMPAT
1764 .compat_ioctl = v4l_compat_ioctl32,
1765 #endif
1766 .llseek = no_llseek,
1767 .poll = dev_poll,
1768 };
1769
1770 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1771 .vidioc_querycap = vidioc_querycap,
1772 .vidioc_dqbuf = vidioc_dqbuf,
1773 .vidioc_qbuf = vidioc_qbuf,
1774 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1775 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1776 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1777 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1778 .vidioc_streamon = vidioc_streamon,
1779 .vidioc_queryctrl = vidioc_queryctrl,
1780 .vidioc_g_ctrl = vidioc_g_ctrl,
1781 .vidioc_s_ctrl = vidioc_s_ctrl,
1782 .vidioc_querymenu = vidioc_querymenu,
1783 .vidioc_enum_input = vidioc_enum_input,
1784 .vidioc_g_input = vidioc_g_input,
1785 .vidioc_s_input = vidioc_s_input,
1786 .vidioc_reqbufs = vidioc_reqbufs,
1787 .vidioc_querybuf = vidioc_querybuf,
1788 .vidioc_streamoff = vidioc_streamoff,
1789 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1790 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1791 .vidioc_g_parm = vidioc_g_parm,
1792 .vidioc_s_parm = vidioc_s_parm,
1793 .vidioc_s_std = vidioc_s_std,
1794 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1795 .vidiocgmbuf = vidiocgmbuf,
1796 #endif
1797 };
1798
1799 static struct video_device gspca_template = {
1800 .name = "gspca main driver",
1801 .fops = &dev_fops,
1802 .ioctl_ops = &dev_ioctl_ops,
1803 .release = dev_release, /* mandatory */
1804 .minor = -1,
1805 };
1806
1807 /*
1808 * probe and create a new gspca device
1809 *
1810 * This function must be called by the sub-driver when it is
1811 * called for probing a new device.
1812 */
1813 int gspca_dev_probe(struct usb_interface *intf,
1814 const struct usb_device_id *id,
1815 const struct sd_desc *sd_desc,
1816 int dev_size,
1817 struct module *module)
1818 {
1819 struct usb_interface_descriptor *interface;
1820 struct gspca_dev *gspca_dev;
1821 struct usb_device *dev = interface_to_usbdev(intf);
1822 int ret;
1823
1824 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1825
1826 /* we don't handle multi-config cameras */
1827 if (dev->descriptor.bNumConfigurations != 1)
1828 return -ENODEV;
1829 interface = &intf->cur_altsetting->desc;
1830 if (interface->bInterfaceNumber > 0)
1831 return -ENODEV;
1832
1833 /* create the device */
1834 if (dev_size < sizeof *gspca_dev)
1835 dev_size = sizeof *gspca_dev;
1836 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1837 if (!gspca_dev) {
1838 err("couldn't kzalloc gspca struct");
1839 return -ENOMEM;
1840 }
1841 kref_init(&gspca_dev->kref);
1842 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1843 if (!gspca_dev->usb_buf) {
1844 err("out of memory");
1845 ret = -ENOMEM;
1846 goto out;
1847 }
1848 gspca_dev->dev = dev;
1849 gspca_dev->iface = interface->bInterfaceNumber;
1850 gspca_dev->nbalt = intf->num_altsetting;
1851 gspca_dev->sd_desc = sd_desc;
1852 gspca_dev->nbufread = 2;
1853
1854 /* configure the subdriver and initialize the USB device */
1855 ret = gspca_dev->sd_desc->config(gspca_dev, id);
1856 if (ret < 0)
1857 goto out;
1858 ret = gspca_dev->sd_desc->init(gspca_dev);
1859 if (ret < 0)
1860 goto out;
1861 ret = gspca_set_alt0(gspca_dev);
1862 if (ret < 0)
1863 goto out;
1864 gspca_set_default_mode(gspca_dev);
1865
1866 mutex_init(&gspca_dev->usb_lock);
1867 mutex_init(&gspca_dev->read_lock);
1868 mutex_init(&gspca_dev->queue_lock);
1869 init_waitqueue_head(&gspca_dev->wq);
1870
1871 /* init video stuff */
1872 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1873 gspca_dev->vdev.parent = &dev->dev;
1874 memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1875 gspca_dev->vdev.fops = &gspca_dev->fops;
1876 gspca_dev->fops.owner = module; /* module protection */
1877 gspca_dev->present = 1;
1878 ret = video_register_device(&gspca_dev->vdev,
1879 VFL_TYPE_GRABBER,
1880 video_nr);
1881 if (ret < 0) {
1882 err("video_register_device err %d", ret);
1883 goto out;
1884 }
1885
1886 usb_set_intfdata(intf, gspca_dev);
1887 PDEBUG(D_PROBE, "probe ok");
1888 return 0;
1889 out:
1890 kref_put(&gspca_dev->kref, gspca_delete);
1891 return ret;
1892 }
1893 EXPORT_SYMBOL(gspca_dev_probe);
1894
1895 /*
1896 * USB disconnection
1897 *
1898 * This function must be called by the sub-driver
1899 * when the device disconnects, after the specific resources are freed.
1900 */
1901 void gspca_disconnect(struct usb_interface *intf)
1902 {
1903 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1904
1905 usb_set_intfdata(intf, NULL);
1906
1907 /* We don't want people trying to open up the device */
1908 video_unregister_device(&gspca_dev->vdev);
1909
1910 gspca_dev->present = 0;
1911 gspca_dev->streaming = 0;
1912
1913 kref_put(&gspca_dev->kref, gspca_delete);
1914
1915 PDEBUG(D_PROBE, "disconnect complete");
1916 }
1917 EXPORT_SYMBOL(gspca_disconnect);
1918
1919 #ifdef CONFIG_PM
1920 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1921 {
1922 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1923
1924 if (!gspca_dev->streaming)
1925 return 0;
1926 gspca_dev->frozen = 1; /* avoid urb error messages */
1927 if (gspca_dev->sd_desc->stopN)
1928 gspca_dev->sd_desc->stopN(gspca_dev);
1929 destroy_urbs(gspca_dev);
1930 gspca_set_alt0(gspca_dev);
1931 if (gspca_dev->sd_desc->stop0)
1932 gspca_dev->sd_desc->stop0(gspca_dev);
1933 return 0;
1934 }
1935 EXPORT_SYMBOL(gspca_suspend);
1936
1937 int gspca_resume(struct usb_interface *intf)
1938 {
1939 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1940
1941 gspca_dev->frozen = 0;
1942 gspca_dev->sd_desc->init(gspca_dev);
1943 if (gspca_dev->streaming)
1944 return gspca_init_transfer(gspca_dev);
1945 return 0;
1946 }
1947 EXPORT_SYMBOL(gspca_resume);
1948 #endif
1949 /* -- cam driver utility functions -- */
1950
1951 /* auto gain and exposure algorithm based on the knee algorithm described here:
1952 http://ytse.tricolour.net/docs/LowLightOptimization.html
1953
1954 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1955 where changed. */
1956 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1957 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1958 {
1959 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1960 const struct ctrl *gain_ctrl = NULL;
1961 const struct ctrl *exposure_ctrl = NULL;
1962 const struct ctrl *autogain_ctrl = NULL;
1963 int retval = 0;
1964
1965 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1966 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1967 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1968 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1969 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1970 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1971 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1972 }
1973 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1974 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1975 "on cam without (auto)gain/exposure");
1976 return 0;
1977 }
1978
1979 if (gain_ctrl->get(gspca_dev, &gain) ||
1980 exposure_ctrl->get(gspca_dev, &exposure) ||
1981 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1982 return 0;
1983
1984 orig_gain = gain;
1985 orig_exposure = exposure;
1986
1987 /* If we are of a multiple of deadzone, do multiple steps to reach the
1988 desired lumination fast (with the risc of a slight overshoot) */
1989 steps = abs(desired_avg_lum - avg_lum) / deadzone;
1990
1991 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1992 avg_lum, desired_avg_lum, steps);
1993
1994 for (i = 0; i < steps; i++) {
1995 if (avg_lum > desired_avg_lum) {
1996 if (gain > gain_knee)
1997 gain--;
1998 else if (exposure > exposure_knee)
1999 exposure--;
2000 else if (gain > gain_ctrl->qctrl.default_value)
2001 gain--;
2002 else if (exposure > exposure_ctrl->qctrl.minimum)
2003 exposure--;
2004 else if (gain > gain_ctrl->qctrl.minimum)
2005 gain--;
2006 else
2007 break;
2008 } else {
2009 if (gain < gain_ctrl->qctrl.default_value)
2010 gain++;
2011 else if (exposure < exposure_knee)
2012 exposure++;
2013 else if (gain < gain_knee)
2014 gain++;
2015 else if (exposure < exposure_ctrl->qctrl.maximum)
2016 exposure++;
2017 else if (gain < gain_ctrl->qctrl.maximum)
2018 gain++;
2019 else
2020 break;
2021 }
2022 }
2023
2024 if (gain != orig_gain) {
2025 gain_ctrl->set(gspca_dev, gain);
2026 retval = 1;
2027 }
2028 if (exposure != orig_exposure) {
2029 exposure_ctrl->set(gspca_dev, exposure);
2030 retval = 1;
2031 }
2032
2033 return retval;
2034 }
2035 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2036
2037 /* -- module insert / remove -- */
2038 static int __init gspca_init(void)
2039 {
2040 info("main v%d.%d.%d registered",
2041 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2042 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2043 DRIVER_VERSION_NUMBER & 0xff);
2044 return 0;
2045 }
2046 static void __exit gspca_exit(void)
2047 {
2048 info("main deregistered");
2049 }
2050
2051 module_init(gspca_init);
2052 module_exit(gspca_exit);
2053
2054 #ifdef GSPCA_DEBUG
2055 module_param_named(debug, gspca_debug, int, 0644);
2056 MODULE_PARM_DESC(debug,
2057 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2058 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2059 " 0x0100: v4l2");
2060 #endif
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