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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[deliverable/linux.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
5 *
6 * Camera button input handling by Márton Németh
7 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #define MODULE_NAME "gspca"
25
26 #include <linux/init.h>
27 #include <linux/version.h>
28 #include <linux/fs.h>
29 #include <linux/vmalloc.h>
30 #include <linux/sched.h>
31 #include <linux/slab.h>
32 #include <linux/mm.h>
33 #include <linux/string.h>
34 #include <linux/pagemap.h>
35 #include <linux/io.h>
36 #include <asm/page.h>
37 #include <linux/uaccess.h>
38 #include <linux/ktime.h>
39 #include <media/v4l2-ioctl.h>
40
41 #include "gspca.h"
42
43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
44 #include <linux/input.h>
45 #include <linux/usb/input.h>
46 #endif
47
48 /* global values */
49 #define DEF_NURBS 3 /* default number of URBs */
50 #if DEF_NURBS > MAX_NURBS
51 #error "DEF_NURBS too big"
52 #endif
53
54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
56 MODULE_LICENSE("GPL");
57
58 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 9, 0)
59
60 #ifdef GSPCA_DEBUG
61 int gspca_debug = D_ERR | D_PROBE;
62 EXPORT_SYMBOL(gspca_debug);
63
64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
65 {
66 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
67 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
68 txt,
69 pixfmt & 0xff,
70 (pixfmt >> 8) & 0xff,
71 (pixfmt >> 16) & 0xff,
72 pixfmt >> 24,
73 w, h);
74 } else {
75 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
76 txt,
77 pixfmt,
78 w, h);
79 }
80 }
81 #else
82 #define PDEBUG_MODE(txt, pixfmt, w, h)
83 #endif
84
85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
86 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
87 #define GSPCA_MEMORY_READ 7
88
89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
90
91 /*
92 * VMA operations.
93 */
94 static void gspca_vm_open(struct vm_area_struct *vma)
95 {
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 frame->vma_use_count++;
99 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static void gspca_vm_close(struct vm_area_struct *vma)
103 {
104 struct gspca_frame *frame = vma->vm_private_data;
105
106 if (--frame->vma_use_count <= 0)
107 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
108 }
109
110 static const struct vm_operations_struct gspca_vm_ops = {
111 .open = gspca_vm_open,
112 .close = gspca_vm_close,
113 };
114
115 /*
116 * Input and interrupt endpoint handling functions
117 */
118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
119 static void int_irq(struct urb *urb)
120 {
121 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
122 int ret;
123
124 ret = urb->status;
125 switch (ret) {
126 case 0:
127 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
128 urb->transfer_buffer, urb->actual_length) < 0) {
129 PDEBUG(D_ERR, "Unknown packet received");
130 }
131 break;
132
133 case -ENOENT:
134 case -ECONNRESET:
135 case -ENODEV:
136 case -ESHUTDOWN:
137 /* Stop is requested either by software or hardware is gone,
138 * keep the ret value non-zero and don't resubmit later.
139 */
140 break;
141
142 default:
143 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
144 urb->status = 0;
145 ret = 0;
146 }
147
148 if (ret == 0) {
149 ret = usb_submit_urb(urb, GFP_ATOMIC);
150 if (ret < 0)
151 PDEBUG(D_ERR, "Resubmit URB failed with error %i", ret);
152 }
153 }
154
155 static int gspca_input_connect(struct gspca_dev *dev)
156 {
157 struct input_dev *input_dev;
158 int err = 0;
159
160 dev->input_dev = NULL;
161 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
162 input_dev = input_allocate_device();
163 if (!input_dev)
164 return -ENOMEM;
165
166 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
167 strlcat(dev->phys, "/input0", sizeof(dev->phys));
168
169 input_dev->name = dev->sd_desc->name;
170 input_dev->phys = dev->phys;
171
172 usb_to_input_id(dev->dev, &input_dev->id);
173
174 input_dev->evbit[0] = BIT_MASK(EV_KEY);
175 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
176 input_dev->dev.parent = &dev->dev->dev;
177
178 err = input_register_device(input_dev);
179 if (err) {
180 PDEBUG(D_ERR, "Input device registration failed "
181 "with error %i", err);
182 input_dev->dev.parent = NULL;
183 input_free_device(input_dev);
184 } else {
185 dev->input_dev = input_dev;
186 }
187 }
188
189 return err;
190 }
191
192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
193 struct usb_endpoint_descriptor *ep)
194 {
195 unsigned int buffer_len;
196 int interval;
197 struct urb *urb;
198 struct usb_device *dev;
199 void *buffer = NULL;
200 int ret = -EINVAL;
201
202 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
203 interval = ep->bInterval;
204 PDEBUG(D_PROBE, "found int in endpoint: 0x%x, "
205 "buffer_len=%u, interval=%u",
206 ep->bEndpointAddress, buffer_len, interval);
207
208 dev = gspca_dev->dev;
209
210 urb = usb_alloc_urb(0, GFP_KERNEL);
211 if (!urb) {
212 ret = -ENOMEM;
213 goto error;
214 }
215
216 buffer = usb_alloc_coherent(dev, buffer_len,
217 GFP_KERNEL, &urb->transfer_dma);
218 if (!buffer) {
219 ret = -ENOMEM;
220 goto error_buffer;
221 }
222 usb_fill_int_urb(urb, dev,
223 usb_rcvintpipe(dev, ep->bEndpointAddress),
224 buffer, buffer_len,
225 int_irq, (void *)gspca_dev, interval);
226 gspca_dev->int_urb = urb;
227 ret = usb_submit_urb(urb, GFP_KERNEL);
228 if (ret < 0) {
229 PDEBUG(D_ERR, "submit URB failed with error %i", ret);
230 goto error_submit;
231 }
232 return ret;
233
234 error_submit:
235 usb_free_coherent(dev,
236 urb->transfer_buffer_length,
237 urb->transfer_buffer,
238 urb->transfer_dma);
239 error_buffer:
240 usb_free_urb(urb);
241 error:
242 return ret;
243 }
244
245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
246 {
247 struct usb_interface *intf;
248 struct usb_host_interface *intf_desc;
249 struct usb_endpoint_descriptor *ep;
250 int i;
251
252 if (gspca_dev->sd_desc->int_pkt_scan) {
253 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
254 intf_desc = intf->cur_altsetting;
255 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
256 ep = &intf_desc->endpoint[i].desc;
257 if (usb_endpoint_dir_in(ep) &&
258 usb_endpoint_xfer_int(ep)) {
259
260 alloc_and_submit_int_urb(gspca_dev, ep);
261 break;
262 }
263 }
264 }
265 }
266
267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
268 {
269 struct urb *urb;
270
271 urb = gspca_dev->int_urb;
272 if (urb) {
273 gspca_dev->int_urb = NULL;
274 usb_kill_urb(urb);
275 usb_free_coherent(gspca_dev->dev,
276 urb->transfer_buffer_length,
277 urb->transfer_buffer,
278 urb->transfer_dma);
279 usb_free_urb(urb);
280 }
281 }
282 #else
283 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
284 {
285 }
286
287 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
288 {
289 }
290
291 static inline int gspca_input_connect(struct gspca_dev *dev)
292 {
293 return 0;
294 }
295 #endif
296
297 /* get the current input frame buffer */
298 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
299 {
300 struct gspca_frame *frame;
301
302 frame = gspca_dev->cur_frame;
303 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
304 != V4L2_BUF_FLAG_QUEUED)
305 return NULL;
306 return frame;
307 }
308 EXPORT_SYMBOL(gspca_get_i_frame);
309
310 /*
311 * fill a video frame from an URB and resubmit
312 */
313 static void fill_frame(struct gspca_dev *gspca_dev,
314 struct urb *urb)
315 {
316 u8 *data; /* address of data in the iso message */
317 int i, len, st;
318 cam_pkt_op pkt_scan;
319
320 if (urb->status != 0) {
321 if (urb->status == -ESHUTDOWN)
322 return; /* disconnection */
323 #ifdef CONFIG_PM
324 if (gspca_dev->frozen)
325 return;
326 #endif
327 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
328 urb->status = 0;
329 goto resubmit;
330 }
331 pkt_scan = gspca_dev->sd_desc->pkt_scan;
332 for (i = 0; i < urb->number_of_packets; i++) {
333
334 /* check the packet status and length */
335 len = urb->iso_frame_desc[i].actual_length;
336 if (len == 0) {
337 if (gspca_dev->empty_packet == 0)
338 gspca_dev->empty_packet = 1;
339 continue;
340 }
341 st = urb->iso_frame_desc[i].status;
342 if (st) {
343 PDEBUG(D_ERR,
344 "ISOC data error: [%d] len=%d, status=%d",
345 i, len, st);
346 gspca_dev->last_packet_type = DISCARD_PACKET;
347 continue;
348 }
349
350 /* let the packet be analyzed by the subdriver */
351 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
352 i, urb->iso_frame_desc[i].offset, len);
353 data = (u8 *) urb->transfer_buffer
354 + urb->iso_frame_desc[i].offset;
355 pkt_scan(gspca_dev, data, len);
356 }
357
358 resubmit:
359 /* resubmit the URB */
360 st = usb_submit_urb(urb, GFP_ATOMIC);
361 if (st < 0)
362 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
363 }
364
365 /*
366 * ISOC message interrupt from the USB device
367 *
368 * Analyse each packet and call the subdriver for copy to the frame buffer.
369 */
370 static void isoc_irq(struct urb *urb)
371 {
372 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
373
374 PDEBUG(D_PACK, "isoc irq");
375 if (!gspca_dev->streaming)
376 return;
377 fill_frame(gspca_dev, urb);
378 }
379
380 /*
381 * bulk message interrupt from the USB device
382 */
383 static void bulk_irq(struct urb *urb)
384 {
385 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
386 int st;
387
388 PDEBUG(D_PACK, "bulk irq");
389 if (!gspca_dev->streaming)
390 return;
391 switch (urb->status) {
392 case 0:
393 break;
394 case -ESHUTDOWN:
395 return; /* disconnection */
396 default:
397 #ifdef CONFIG_PM
398 if (gspca_dev->frozen)
399 return;
400 #endif
401 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
402 urb->status = 0;
403 goto resubmit;
404 }
405
406 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
407 gspca_dev->sd_desc->pkt_scan(gspca_dev,
408 urb->transfer_buffer,
409 urb->actual_length);
410
411 resubmit:
412 /* resubmit the URB */
413 if (gspca_dev->cam.bulk_nurbs != 0) {
414 st = usb_submit_urb(urb, GFP_ATOMIC);
415 if (st < 0)
416 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
417 }
418 }
419
420 /*
421 * add data to the current frame
422 *
423 * This function is called by the subdrivers at interrupt level.
424 *
425 * To build a frame, these ones must add
426 * - one FIRST_PACKET
427 * - 0 or many INTER_PACKETs
428 * - one LAST_PACKET
429 * DISCARD_PACKET invalidates the whole frame.
430 * On LAST_PACKET, a new frame is returned.
431 */
432 void gspca_frame_add(struct gspca_dev *gspca_dev,
433 enum gspca_packet_type packet_type,
434 const u8 *data,
435 int len)
436 {
437 struct gspca_frame *frame;
438 int i, j;
439
440 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
441
442 /* check the availability of the frame buffer */
443 frame = gspca_dev->cur_frame;
444 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
445 != V4L2_BUF_FLAG_QUEUED) {
446 gspca_dev->last_packet_type = DISCARD_PACKET;
447 return;
448 }
449
450 /* when start of a new frame, if the current frame buffer
451 * is not queued, discard the whole frame */
452 if (packet_type == FIRST_PACKET) {
453 frame->data_end = frame->data;
454 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
455 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
456 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
457 if (packet_type == LAST_PACKET)
458 gspca_dev->last_packet_type = packet_type;
459 return;
460 }
461
462 /* append the packet to the frame buffer */
463 if (len > 0) {
464 if (frame->data_end - frame->data + len
465 > frame->v4l2_buf.length) {
466 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
467 frame->data_end - frame->data + len,
468 frame->v4l2_buf.length);
469 packet_type = DISCARD_PACKET;
470 } else {
471 memcpy(frame->data_end, data, len);
472 frame->data_end += len;
473 }
474 }
475 gspca_dev->last_packet_type = packet_type;
476
477 /* if last packet, wake up the application and advance in the queue */
478 if (packet_type == LAST_PACKET) {
479 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
480 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
481 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
482 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
483 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
484 gspca_dev->fr_i = i;
485 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
486 frame->v4l2_buf.bytesused,
487 gspca_dev->fr_q,
488 i,
489 gspca_dev->fr_o);
490 j = gspca_dev->fr_queue[i];
491 gspca_dev->cur_frame = &gspca_dev->frame[j];
492 }
493 }
494 EXPORT_SYMBOL(gspca_frame_add);
495
496 static int gspca_is_compressed(__u32 format)
497 {
498 switch (format) {
499 case V4L2_PIX_FMT_MJPEG:
500 case V4L2_PIX_FMT_JPEG:
501 case V4L2_PIX_FMT_SPCA561:
502 case V4L2_PIX_FMT_PAC207:
503 case V4L2_PIX_FMT_MR97310A:
504 return 1;
505 }
506 return 0;
507 }
508
509 static void *rvmalloc(long size)
510 {
511 void *mem;
512 unsigned long adr;
513
514 mem = vmalloc_32(size);
515 if (mem != NULL) {
516 adr = (unsigned long) mem;
517 while (size > 0) {
518 SetPageReserved(vmalloc_to_page((void *) adr));
519 adr += PAGE_SIZE;
520 size -= PAGE_SIZE;
521 }
522 }
523 return mem;
524 }
525
526 static void rvfree(void *mem, long size)
527 {
528 unsigned long adr;
529
530 adr = (unsigned long) mem;
531 while (size > 0) {
532 ClearPageReserved(vmalloc_to_page((void *) adr));
533 adr += PAGE_SIZE;
534 size -= PAGE_SIZE;
535 }
536 vfree(mem);
537 }
538
539 static int frame_alloc(struct gspca_dev *gspca_dev,
540 unsigned int count)
541 {
542 struct gspca_frame *frame;
543 unsigned int frsz;
544 int i;
545
546 i = gspca_dev->curr_mode;
547 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
548 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
549 frsz = PAGE_ALIGN(frsz);
550 gspca_dev->frsz = frsz;
551 if (count > GSPCA_MAX_FRAMES)
552 count = GSPCA_MAX_FRAMES;
553 gspca_dev->frbuf = rvmalloc(frsz * count);
554 if (!gspca_dev->frbuf) {
555 err("frame alloc failed");
556 return -ENOMEM;
557 }
558 gspca_dev->nframes = count;
559 for (i = 0; i < count; i++) {
560 frame = &gspca_dev->frame[i];
561 frame->v4l2_buf.index = i;
562 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
563 frame->v4l2_buf.flags = 0;
564 frame->v4l2_buf.field = V4L2_FIELD_NONE;
565 frame->v4l2_buf.length = frsz;
566 frame->v4l2_buf.memory = gspca_dev->memory;
567 frame->v4l2_buf.sequence = 0;
568 frame->data = frame->data_end =
569 gspca_dev->frbuf + i * frsz;
570 frame->v4l2_buf.m.offset = i * frsz;
571 }
572 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
573 gspca_dev->cur_frame = &gspca_dev->frame[0];
574 gspca_dev->last_packet_type = DISCARD_PACKET;
575 gspca_dev->sequence = 0;
576 return 0;
577 }
578
579 static void frame_free(struct gspca_dev *gspca_dev)
580 {
581 int i;
582
583 PDEBUG(D_STREAM, "frame free");
584 if (gspca_dev->frbuf != NULL) {
585 rvfree(gspca_dev->frbuf,
586 gspca_dev->nframes * gspca_dev->frsz);
587 gspca_dev->frbuf = NULL;
588 for (i = 0; i < gspca_dev->nframes; i++)
589 gspca_dev->frame[i].data = NULL;
590 }
591 gspca_dev->nframes = 0;
592 }
593
594 static void destroy_urbs(struct gspca_dev *gspca_dev)
595 {
596 struct urb *urb;
597 unsigned int i;
598
599 PDEBUG(D_STREAM, "kill transfer");
600 for (i = 0; i < MAX_NURBS; i++) {
601 urb = gspca_dev->urb[i];
602 if (urb == NULL)
603 break;
604
605 gspca_dev->urb[i] = NULL;
606 usb_kill_urb(urb);
607 if (urb->transfer_buffer != NULL)
608 usb_free_coherent(gspca_dev->dev,
609 urb->transfer_buffer_length,
610 urb->transfer_buffer,
611 urb->transfer_dma);
612 usb_free_urb(urb);
613 }
614 }
615
616 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
617 {
618 int ret;
619
620 if (gspca_dev->alt == 0)
621 return 0;
622 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
623 if (ret < 0)
624 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
625 return ret;
626 }
627
628 /* Note: both the queue and the usb locks should be held when calling this */
629 static void gspca_stream_off(struct gspca_dev *gspca_dev)
630 {
631 gspca_dev->streaming = 0;
632 if (gspca_dev->present) {
633 if (gspca_dev->sd_desc->stopN)
634 gspca_dev->sd_desc->stopN(gspca_dev);
635 destroy_urbs(gspca_dev);
636 gspca_input_destroy_urb(gspca_dev);
637 gspca_set_alt0(gspca_dev);
638 gspca_input_create_urb(gspca_dev);
639 }
640
641 /* always call stop0 to free the subdriver's resources */
642 if (gspca_dev->sd_desc->stop0)
643 gspca_dev->sd_desc->stop0(gspca_dev);
644 PDEBUG(D_STREAM, "stream off OK");
645 }
646
647 /*
648 * look for an input transfer endpoint in an alternate setting
649 */
650 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
651 int xfer)
652 {
653 struct usb_host_endpoint *ep;
654 int i, attr;
655
656 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
657 ep = &alt->endpoint[i];
658 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
659 if (attr == xfer
660 && ep->desc.wMaxPacketSize != 0)
661 return ep;
662 }
663 return NULL;
664 }
665
666 /*
667 * look for an input (isoc or bulk) endpoint
668 *
669 * The endpoint is defined by the subdriver.
670 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
671 * This routine may be called many times when the bandwidth is too small
672 * (the bandwidth is checked on urb submit).
673 */
674 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
675 {
676 struct usb_interface *intf;
677 struct usb_host_endpoint *ep;
678 int xfer, i, ret;
679
680 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
681 ep = NULL;
682 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
683 : USB_ENDPOINT_XFER_ISOC;
684 i = gspca_dev->alt; /* previous alt setting */
685 if (gspca_dev->cam.reverse_alts) {
686 while (++i < gspca_dev->nbalt) {
687 ep = alt_xfer(&intf->altsetting[i], xfer);
688 if (ep)
689 break;
690 }
691 } else {
692 while (--i >= 0) {
693 ep = alt_xfer(&intf->altsetting[i], xfer);
694 if (ep)
695 break;
696 }
697 }
698 if (ep == NULL) {
699 err("no transfer endpoint found");
700 return NULL;
701 }
702 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
703 i, ep->desc.bEndpointAddress);
704 gspca_dev->alt = i; /* memorize the current alt setting */
705 if (gspca_dev->nbalt > 1) {
706 gspca_input_destroy_urb(gspca_dev);
707 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
708 if (ret < 0) {
709 err("set alt %d err %d", i, ret);
710 ep = NULL;
711 }
712 gspca_input_create_urb(gspca_dev);
713 }
714 return ep;
715 }
716
717 /*
718 * create the URBs for image transfer
719 */
720 static int create_urbs(struct gspca_dev *gspca_dev,
721 struct usb_host_endpoint *ep)
722 {
723 struct urb *urb;
724 int n, nurbs, i, psize, npkt, bsize;
725
726 /* calculate the packet size and the number of packets */
727 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
728
729 if (!gspca_dev->cam.bulk) { /* isoc */
730
731 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
732 if (gspca_dev->pkt_size == 0)
733 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
734 else
735 psize = gspca_dev->pkt_size;
736 npkt = gspca_dev->cam.npkt;
737 if (npkt == 0)
738 npkt = 32; /* default value */
739 bsize = psize * npkt;
740 PDEBUG(D_STREAM,
741 "isoc %d pkts size %d = bsize:%d",
742 npkt, psize, bsize);
743 nurbs = DEF_NURBS;
744 } else { /* bulk */
745 npkt = 0;
746 bsize = gspca_dev->cam.bulk_size;
747 if (bsize == 0)
748 bsize = psize;
749 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
750 if (gspca_dev->cam.bulk_nurbs != 0)
751 nurbs = gspca_dev->cam.bulk_nurbs;
752 else
753 nurbs = 1;
754 }
755
756 for (n = 0; n < nurbs; n++) {
757 urb = usb_alloc_urb(npkt, GFP_KERNEL);
758 if (!urb) {
759 err("usb_alloc_urb failed");
760 return -ENOMEM;
761 }
762 gspca_dev->urb[n] = urb;
763 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
764 bsize,
765 GFP_KERNEL,
766 &urb->transfer_dma);
767
768 if (urb->transfer_buffer == NULL) {
769 err("usb_alloc_coherent failed");
770 return -ENOMEM;
771 }
772 urb->dev = gspca_dev->dev;
773 urb->context = gspca_dev;
774 urb->transfer_buffer_length = bsize;
775 if (npkt != 0) { /* ISOC */
776 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
777 ep->desc.bEndpointAddress);
778 urb->transfer_flags = URB_ISO_ASAP
779 | URB_NO_TRANSFER_DMA_MAP;
780 urb->interval = ep->desc.bInterval;
781 urb->complete = isoc_irq;
782 urb->number_of_packets = npkt;
783 for (i = 0; i < npkt; i++) {
784 urb->iso_frame_desc[i].length = psize;
785 urb->iso_frame_desc[i].offset = psize * i;
786 }
787 } else { /* bulk */
788 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
789 ep->desc.bEndpointAddress),
790 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
791 urb->complete = bulk_irq;
792 }
793 }
794 return 0;
795 }
796
797 /*
798 * start the USB transfer
799 */
800 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
801 {
802 struct usb_host_endpoint *ep;
803 struct urb *urb;
804 int n, ret;
805
806 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
807 return -ERESTARTSYS;
808
809 if (!gspca_dev->present) {
810 ret = -ENODEV;
811 goto out;
812 }
813
814 gspca_dev->usb_err = 0;
815
816 /* set the higher alternate setting and
817 * loop until urb submit succeeds */
818 if (gspca_dev->cam.reverse_alts)
819 gspca_dev->alt = 0;
820 else
821 gspca_dev->alt = gspca_dev->nbalt;
822
823 if (gspca_dev->sd_desc->isoc_init) {
824 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
825 if (ret < 0)
826 goto out;
827 }
828 ep = get_ep(gspca_dev);
829 if (ep == NULL) {
830 ret = -EIO;
831 goto out;
832 }
833 for (;;) {
834 if (!gspca_dev->cam.no_urb_create) {
835 PDEBUG(D_STREAM, "init transfer alt %d",
836 gspca_dev->alt);
837 ret = create_urbs(gspca_dev, ep);
838 if (ret < 0) {
839 destroy_urbs(gspca_dev);
840 goto out;
841 }
842 }
843
844 /* clear the bulk endpoint */
845 if (gspca_dev->cam.bulk)
846 usb_clear_halt(gspca_dev->dev,
847 gspca_dev->urb[0]->pipe);
848
849 /* start the cam */
850 ret = gspca_dev->sd_desc->start(gspca_dev);
851 if (ret < 0) {
852 destroy_urbs(gspca_dev);
853 goto out;
854 }
855 gspca_dev->streaming = 1;
856
857 /* some bulk transfers are started by the subdriver */
858 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
859 break;
860
861 /* submit the URBs */
862 for (n = 0; n < MAX_NURBS; n++) {
863 urb = gspca_dev->urb[n];
864 if (urb == NULL)
865 break;
866 ret = usb_submit_urb(urb, GFP_KERNEL);
867 if (ret < 0)
868 break;
869 }
870 if (ret >= 0)
871 break;
872 gspca_stream_off(gspca_dev);
873 if (ret != -ENOSPC) {
874 PDEBUG(D_ERR|D_STREAM,
875 "usb_submit_urb alt %d err %d",
876 gspca_dev->alt, ret);
877 goto out;
878 }
879
880 /* the bandwidth is not wide enough
881 * negociate or try a lower alternate setting */
882 PDEBUG(D_ERR|D_STREAM,
883 "bandwidth not wide enough - trying again");
884 msleep(20); /* wait for kill complete */
885 if (gspca_dev->sd_desc->isoc_nego) {
886 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
887 if (ret < 0)
888 goto out;
889 } else {
890 ep = get_ep(gspca_dev);
891 if (ep == NULL) {
892 ret = -EIO;
893 goto out;
894 }
895 }
896 }
897 out:
898 mutex_unlock(&gspca_dev->usb_lock);
899 return ret;
900 }
901
902 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
903 {
904 int i;
905
906 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
907 gspca_dev->curr_mode = i;
908 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
909 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
910 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
911 }
912
913 static int wxh_to_mode(struct gspca_dev *gspca_dev,
914 int width, int height)
915 {
916 int i;
917
918 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
919 if (width >= gspca_dev->cam.cam_mode[i].width
920 && height >= gspca_dev->cam.cam_mode[i].height)
921 break;
922 }
923 return i;
924 }
925
926 /*
927 * search a mode with the right pixel format
928 */
929 static int gspca_get_mode(struct gspca_dev *gspca_dev,
930 int mode,
931 int pixfmt)
932 {
933 int modeU, modeD;
934
935 modeU = modeD = mode;
936 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
937 if (--modeD >= 0) {
938 if (gspca_dev->cam.cam_mode[modeD].pixelformat
939 == pixfmt)
940 return modeD;
941 }
942 if (++modeU < gspca_dev->cam.nmodes) {
943 if (gspca_dev->cam.cam_mode[modeU].pixelformat
944 == pixfmt)
945 return modeU;
946 }
947 }
948 return -EINVAL;
949 }
950
951 #ifdef CONFIG_VIDEO_ADV_DEBUG
952 static int vidioc_g_register(struct file *file, void *priv,
953 struct v4l2_dbg_register *reg)
954 {
955 int ret;
956 struct gspca_dev *gspca_dev = priv;
957
958 if (!gspca_dev->sd_desc->get_chip_ident)
959 return -EINVAL;
960
961 if (!gspca_dev->sd_desc->get_register)
962 return -EINVAL;
963
964 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
965 return -ERESTARTSYS;
966 gspca_dev->usb_err = 0;
967 if (gspca_dev->present)
968 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
969 else
970 ret = -ENODEV;
971 mutex_unlock(&gspca_dev->usb_lock);
972
973 return ret;
974 }
975
976 static int vidioc_s_register(struct file *file, void *priv,
977 struct v4l2_dbg_register *reg)
978 {
979 int ret;
980 struct gspca_dev *gspca_dev = priv;
981
982 if (!gspca_dev->sd_desc->get_chip_ident)
983 return -EINVAL;
984
985 if (!gspca_dev->sd_desc->set_register)
986 return -EINVAL;
987
988 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
989 return -ERESTARTSYS;
990 gspca_dev->usb_err = 0;
991 if (gspca_dev->present)
992 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
993 else
994 ret = -ENODEV;
995 mutex_unlock(&gspca_dev->usb_lock);
996
997 return ret;
998 }
999 #endif
1000
1001 static int vidioc_g_chip_ident(struct file *file, void *priv,
1002 struct v4l2_dbg_chip_ident *chip)
1003 {
1004 int ret;
1005 struct gspca_dev *gspca_dev = priv;
1006
1007 if (!gspca_dev->sd_desc->get_chip_ident)
1008 return -EINVAL;
1009
1010 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1011 return -ERESTARTSYS;
1012 gspca_dev->usb_err = 0;
1013 if (gspca_dev->present)
1014 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1015 else
1016 ret = -ENODEV;
1017 mutex_unlock(&gspca_dev->usb_lock);
1018
1019 return ret;
1020 }
1021
1022 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1023 struct v4l2_fmtdesc *fmtdesc)
1024 {
1025 struct gspca_dev *gspca_dev = priv;
1026 int i, j, index;
1027 __u32 fmt_tb[8];
1028
1029 /* give an index to each format */
1030 index = 0;
1031 j = 0;
1032 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1033 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1034 j = 0;
1035 for (;;) {
1036 if (fmt_tb[j] == fmt_tb[index])
1037 break;
1038 j++;
1039 }
1040 if (j == index) {
1041 if (fmtdesc->index == index)
1042 break; /* new format */
1043 index++;
1044 if (index >= ARRAY_SIZE(fmt_tb))
1045 return -EINVAL;
1046 }
1047 }
1048 if (i < 0)
1049 return -EINVAL; /* no more format */
1050
1051 fmtdesc->pixelformat = fmt_tb[index];
1052 if (gspca_is_compressed(fmt_tb[index]))
1053 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1054 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1055 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1056 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1057 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1058 fmtdesc->description[4] = '\0';
1059 return 0;
1060 }
1061
1062 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1063 struct v4l2_format *fmt)
1064 {
1065 struct gspca_dev *gspca_dev = priv;
1066 int mode;
1067
1068 mode = gspca_dev->curr_mode;
1069 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1070 sizeof fmt->fmt.pix);
1071 return 0;
1072 }
1073
1074 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1075 struct v4l2_format *fmt)
1076 {
1077 int w, h, mode, mode2;
1078
1079 w = fmt->fmt.pix.width;
1080 h = fmt->fmt.pix.height;
1081
1082 #ifdef GSPCA_DEBUG
1083 if (gspca_debug & D_CONF)
1084 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1085 #endif
1086 /* search the closest mode for width and height */
1087 mode = wxh_to_mode(gspca_dev, w, h);
1088
1089 /* OK if right palette */
1090 if (gspca_dev->cam.cam_mode[mode].pixelformat
1091 != fmt->fmt.pix.pixelformat) {
1092
1093 /* else, search the closest mode with the same pixel format */
1094 mode2 = gspca_get_mode(gspca_dev, mode,
1095 fmt->fmt.pix.pixelformat);
1096 if (mode2 >= 0)
1097 mode = mode2;
1098 /* else
1099 ; * no chance, return this mode */
1100 }
1101 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1102 sizeof fmt->fmt.pix);
1103 return mode; /* used when s_fmt */
1104 }
1105
1106 static int vidioc_try_fmt_vid_cap(struct file *file,
1107 void *priv,
1108 struct v4l2_format *fmt)
1109 {
1110 struct gspca_dev *gspca_dev = priv;
1111 int ret;
1112
1113 ret = try_fmt_vid_cap(gspca_dev, fmt);
1114 if (ret < 0)
1115 return ret;
1116 return 0;
1117 }
1118
1119 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1120 struct v4l2_format *fmt)
1121 {
1122 struct gspca_dev *gspca_dev = priv;
1123 int ret;
1124
1125 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1126 return -ERESTARTSYS;
1127
1128 ret = try_fmt_vid_cap(gspca_dev, fmt);
1129 if (ret < 0)
1130 goto out;
1131
1132 if (gspca_dev->nframes != 0
1133 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1134 ret = -EINVAL;
1135 goto out;
1136 }
1137
1138 if (ret == gspca_dev->curr_mode) {
1139 ret = 0;
1140 goto out; /* same mode */
1141 }
1142
1143 if (gspca_dev->streaming) {
1144 ret = -EBUSY;
1145 goto out;
1146 }
1147 gspca_dev->width = fmt->fmt.pix.width;
1148 gspca_dev->height = fmt->fmt.pix.height;
1149 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1150 gspca_dev->curr_mode = ret;
1151
1152 ret = 0;
1153 out:
1154 mutex_unlock(&gspca_dev->queue_lock);
1155 return ret;
1156 }
1157
1158 static int vidioc_enum_framesizes(struct file *file, void *priv,
1159 struct v4l2_frmsizeenum *fsize)
1160 {
1161 struct gspca_dev *gspca_dev = priv;
1162 int i;
1163 __u32 index = 0;
1164
1165 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1166 if (fsize->pixel_format !=
1167 gspca_dev->cam.cam_mode[i].pixelformat)
1168 continue;
1169
1170 if (fsize->index == index) {
1171 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1172 fsize->discrete.width =
1173 gspca_dev->cam.cam_mode[i].width;
1174 fsize->discrete.height =
1175 gspca_dev->cam.cam_mode[i].height;
1176 return 0;
1177 }
1178 index++;
1179 }
1180
1181 return -EINVAL;
1182 }
1183
1184 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1185 struct v4l2_frmivalenum *fival)
1186 {
1187 struct gspca_dev *gspca_dev = priv;
1188 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1189 __u32 i;
1190
1191 if (gspca_dev->cam.mode_framerates == NULL ||
1192 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1193 return -EINVAL;
1194
1195 if (fival->pixel_format !=
1196 gspca_dev->cam.cam_mode[mode].pixelformat)
1197 return -EINVAL;
1198
1199 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1200 if (fival->index == i) {
1201 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1202 fival->discrete.numerator = 1;
1203 fival->discrete.denominator =
1204 gspca_dev->cam.mode_framerates[mode].rates[i];
1205 return 0;
1206 }
1207 }
1208
1209 return -EINVAL;
1210 }
1211
1212 static void gspca_release(struct video_device *vfd)
1213 {
1214 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1215
1216 PDEBUG(D_PROBE, "%s released",
1217 video_device_node_name(&gspca_dev->vdev));
1218
1219 kfree(gspca_dev->usb_buf);
1220 kfree(gspca_dev);
1221 }
1222
1223 static int dev_open(struct file *file)
1224 {
1225 struct gspca_dev *gspca_dev;
1226 int ret;
1227
1228 PDEBUG(D_STREAM, "[%s] open", current->comm);
1229 gspca_dev = (struct gspca_dev *) video_devdata(file);
1230 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1231 return -ERESTARTSYS;
1232 if (!gspca_dev->present) {
1233 ret = -ENODEV;
1234 goto out;
1235 }
1236
1237 if (gspca_dev->users > 4) { /* (arbitrary value) */
1238 ret = -EBUSY;
1239 goto out;
1240 }
1241
1242 /* protect the subdriver against rmmod */
1243 if (!try_module_get(gspca_dev->module)) {
1244 ret = -ENODEV;
1245 goto out;
1246 }
1247
1248 gspca_dev->users++;
1249
1250 file->private_data = gspca_dev;
1251 #ifdef GSPCA_DEBUG
1252 /* activate the v4l2 debug */
1253 if (gspca_debug & D_V4L2)
1254 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1255 | V4L2_DEBUG_IOCTL_ARG;
1256 else
1257 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1258 | V4L2_DEBUG_IOCTL_ARG);
1259 #endif
1260 ret = 0;
1261 out:
1262 mutex_unlock(&gspca_dev->queue_lock);
1263 if (ret != 0)
1264 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1265 else
1266 PDEBUG(D_STREAM, "open done");
1267 return ret;
1268 }
1269
1270 static int dev_close(struct file *file)
1271 {
1272 struct gspca_dev *gspca_dev = file->private_data;
1273
1274 PDEBUG(D_STREAM, "[%s] close", current->comm);
1275 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1276 return -ERESTARTSYS;
1277 gspca_dev->users--;
1278
1279 /* if the file did the capture, free the streaming resources */
1280 if (gspca_dev->capt_file == file) {
1281 if (gspca_dev->streaming) {
1282 mutex_lock(&gspca_dev->usb_lock);
1283 gspca_dev->usb_err = 0;
1284 gspca_stream_off(gspca_dev);
1285 mutex_unlock(&gspca_dev->usb_lock);
1286 }
1287 frame_free(gspca_dev);
1288 gspca_dev->capt_file = NULL;
1289 gspca_dev->memory = GSPCA_MEMORY_NO;
1290 }
1291 file->private_data = NULL;
1292 module_put(gspca_dev->module);
1293 mutex_unlock(&gspca_dev->queue_lock);
1294
1295 PDEBUG(D_STREAM, "close done");
1296
1297 return 0;
1298 }
1299
1300 static int vidioc_querycap(struct file *file, void *priv,
1301 struct v4l2_capability *cap)
1302 {
1303 struct gspca_dev *gspca_dev = priv;
1304 int ret;
1305
1306 /* protect the access to the usb device */
1307 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1308 return -ERESTARTSYS;
1309 if (!gspca_dev->present) {
1310 ret = -ENODEV;
1311 goto out;
1312 }
1313 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1314 if (gspca_dev->dev->product != NULL) {
1315 strncpy(cap->card, gspca_dev->dev->product,
1316 sizeof cap->card);
1317 } else {
1318 snprintf(cap->card, sizeof cap->card,
1319 "USB Camera (%04x:%04x)",
1320 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1321 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1322 }
1323 usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1324 cap->version = DRIVER_VERSION_NUMBER;
1325 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1326 | V4L2_CAP_STREAMING
1327 | V4L2_CAP_READWRITE;
1328 ret = 0;
1329 out:
1330 mutex_unlock(&gspca_dev->usb_lock);
1331 return ret;
1332 }
1333
1334 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1335 int id)
1336 {
1337 const struct ctrl *ctrls;
1338 int i;
1339
1340 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1341 i < gspca_dev->sd_desc->nctrls;
1342 i++, ctrls++) {
1343 if (gspca_dev->ctrl_dis & (1 << i))
1344 continue;
1345 if (id == ctrls->qctrl.id)
1346 return ctrls;
1347 }
1348 return NULL;
1349 }
1350
1351 static int vidioc_queryctrl(struct file *file, void *priv,
1352 struct v4l2_queryctrl *q_ctrl)
1353 {
1354 struct gspca_dev *gspca_dev = priv;
1355 const struct ctrl *ctrls;
1356 int i;
1357 u32 id;
1358
1359 ctrls = NULL;
1360 id = q_ctrl->id;
1361 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1362 id &= V4L2_CTRL_ID_MASK;
1363 id++;
1364 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1365 if (gspca_dev->ctrl_dis & (1 << i))
1366 continue;
1367 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1368 continue;
1369 if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1370 > ctrls->qctrl.id)
1371 continue;
1372 ctrls = &gspca_dev->sd_desc->ctrls[i];
1373 }
1374 if (ctrls == NULL)
1375 return -EINVAL;
1376 } else {
1377 ctrls = get_ctrl(gspca_dev, id);
1378 if (ctrls == NULL)
1379 return -EINVAL;
1380 i = ctrls - gspca_dev->sd_desc->ctrls;
1381 }
1382 memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1383 if (gspca_dev->ctrl_inac & (1 << i))
1384 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1385 return 0;
1386 }
1387
1388 static int vidioc_s_ctrl(struct file *file, void *priv,
1389 struct v4l2_control *ctrl)
1390 {
1391 struct gspca_dev *gspca_dev = priv;
1392 const struct ctrl *ctrls;
1393 int ret;
1394
1395 ctrls = get_ctrl(gspca_dev, ctrl->id);
1396 if (ctrls == NULL)
1397 return -EINVAL;
1398
1399 if (ctrl->value < ctrls->qctrl.minimum
1400 || ctrl->value > ctrls->qctrl.maximum)
1401 return -ERANGE;
1402 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1403 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1404 return -ERESTARTSYS;
1405 gspca_dev->usb_err = 0;
1406 if (gspca_dev->present)
1407 ret = ctrls->set(gspca_dev, ctrl->value);
1408 else
1409 ret = -ENODEV;
1410 mutex_unlock(&gspca_dev->usb_lock);
1411 return ret;
1412 }
1413
1414 static int vidioc_g_ctrl(struct file *file, void *priv,
1415 struct v4l2_control *ctrl)
1416 {
1417 struct gspca_dev *gspca_dev = priv;
1418 const struct ctrl *ctrls;
1419 int ret;
1420
1421 ctrls = get_ctrl(gspca_dev, ctrl->id);
1422 if (ctrls == NULL)
1423 return -EINVAL;
1424
1425 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1426 return -ERESTARTSYS;
1427 gspca_dev->usb_err = 0;
1428 if (gspca_dev->present)
1429 ret = ctrls->get(gspca_dev, &ctrl->value);
1430 else
1431 ret = -ENODEV;
1432 mutex_unlock(&gspca_dev->usb_lock);
1433 return ret;
1434 }
1435
1436 /*fixme: have an audio flag in gspca_dev?*/
1437 static int vidioc_s_audio(struct file *file, void *priv,
1438 struct v4l2_audio *audio)
1439 {
1440 if (audio->index != 0)
1441 return -EINVAL;
1442 return 0;
1443 }
1444
1445 static int vidioc_g_audio(struct file *file, void *priv,
1446 struct v4l2_audio *audio)
1447 {
1448 strcpy(audio->name, "Microphone");
1449 return 0;
1450 }
1451
1452 static int vidioc_enumaudio(struct file *file, void *priv,
1453 struct v4l2_audio *audio)
1454 {
1455 if (audio->index != 0)
1456 return -EINVAL;
1457
1458 strcpy(audio->name, "Microphone");
1459 audio->capability = 0;
1460 audio->mode = 0;
1461 return 0;
1462 }
1463
1464 static int vidioc_querymenu(struct file *file, void *priv,
1465 struct v4l2_querymenu *qmenu)
1466 {
1467 struct gspca_dev *gspca_dev = priv;
1468
1469 if (!gspca_dev->sd_desc->querymenu)
1470 return -EINVAL;
1471 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1472 }
1473
1474 static int vidioc_enum_input(struct file *file, void *priv,
1475 struct v4l2_input *input)
1476 {
1477 struct gspca_dev *gspca_dev = priv;
1478
1479 if (input->index != 0)
1480 return -EINVAL;
1481 input->type = V4L2_INPUT_TYPE_CAMERA;
1482 input->status = gspca_dev->cam.input_flags;
1483 strncpy(input->name, gspca_dev->sd_desc->name,
1484 sizeof input->name);
1485 return 0;
1486 }
1487
1488 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1489 {
1490 *i = 0;
1491 return 0;
1492 }
1493
1494 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1495 {
1496 if (i > 0)
1497 return -EINVAL;
1498 return (0);
1499 }
1500
1501 static int vidioc_reqbufs(struct file *file, void *priv,
1502 struct v4l2_requestbuffers *rb)
1503 {
1504 struct gspca_dev *gspca_dev = priv;
1505 int i, ret = 0, streaming;
1506
1507 switch (rb->memory) {
1508 case GSPCA_MEMORY_READ: /* (internal call) */
1509 case V4L2_MEMORY_MMAP:
1510 case V4L2_MEMORY_USERPTR:
1511 break;
1512 default:
1513 return -EINVAL;
1514 }
1515 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1516 return -ERESTARTSYS;
1517
1518 if (gspca_dev->memory != GSPCA_MEMORY_NO
1519 && gspca_dev->memory != rb->memory) {
1520 ret = -EBUSY;
1521 goto out;
1522 }
1523
1524 /* only one file may do the capture */
1525 if (gspca_dev->capt_file != NULL
1526 && gspca_dev->capt_file != file) {
1527 ret = -EBUSY;
1528 goto out;
1529 }
1530
1531 /* if allocated, the buffers must not be mapped */
1532 for (i = 0; i < gspca_dev->nframes; i++) {
1533 if (gspca_dev->frame[i].vma_use_count) {
1534 ret = -EBUSY;
1535 goto out;
1536 }
1537 }
1538
1539 /* stop streaming */
1540 streaming = gspca_dev->streaming;
1541 if (streaming) {
1542 mutex_lock(&gspca_dev->usb_lock);
1543 gspca_dev->usb_err = 0;
1544 gspca_stream_off(gspca_dev);
1545 mutex_unlock(&gspca_dev->usb_lock);
1546 }
1547
1548 /* free the previous allocated buffers, if any */
1549 if (gspca_dev->nframes != 0) {
1550 frame_free(gspca_dev);
1551 gspca_dev->capt_file = NULL;
1552 }
1553 if (rb->count == 0) /* unrequest */
1554 goto out;
1555 gspca_dev->memory = rb->memory;
1556 ret = frame_alloc(gspca_dev, rb->count);
1557 if (ret == 0) {
1558 rb->count = gspca_dev->nframes;
1559 gspca_dev->capt_file = file;
1560 if (streaming)
1561 ret = gspca_init_transfer(gspca_dev);
1562 }
1563 out:
1564 mutex_unlock(&gspca_dev->queue_lock);
1565 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1566 return ret;
1567 }
1568
1569 static int vidioc_querybuf(struct file *file, void *priv,
1570 struct v4l2_buffer *v4l2_buf)
1571 {
1572 struct gspca_dev *gspca_dev = priv;
1573 struct gspca_frame *frame;
1574
1575 if (v4l2_buf->index < 0
1576 || v4l2_buf->index >= gspca_dev->nframes)
1577 return -EINVAL;
1578
1579 frame = &gspca_dev->frame[v4l2_buf->index];
1580 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1581 return 0;
1582 }
1583
1584 static int vidioc_streamon(struct file *file, void *priv,
1585 enum v4l2_buf_type buf_type)
1586 {
1587 struct gspca_dev *gspca_dev = priv;
1588 int ret;
1589
1590 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1591 return -EINVAL;
1592 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1593 return -ERESTARTSYS;
1594
1595 /* check the capture file */
1596 if (gspca_dev->capt_file != file) {
1597 ret = -EBUSY;
1598 goto out;
1599 }
1600
1601 if (gspca_dev->nframes == 0
1602 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1603 ret = -EINVAL;
1604 goto out;
1605 }
1606 if (!gspca_dev->streaming) {
1607 ret = gspca_init_transfer(gspca_dev);
1608 if (ret < 0)
1609 goto out;
1610 }
1611 #ifdef GSPCA_DEBUG
1612 if (gspca_debug & D_STREAM) {
1613 PDEBUG_MODE("stream on OK",
1614 gspca_dev->pixfmt,
1615 gspca_dev->width,
1616 gspca_dev->height);
1617 }
1618 #endif
1619 ret = 0;
1620 out:
1621 mutex_unlock(&gspca_dev->queue_lock);
1622 return ret;
1623 }
1624
1625 static int vidioc_streamoff(struct file *file, void *priv,
1626 enum v4l2_buf_type buf_type)
1627 {
1628 struct gspca_dev *gspca_dev = priv;
1629 int i, ret;
1630
1631 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1632 return -EINVAL;
1633 if (!gspca_dev->streaming)
1634 return 0;
1635 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1636 return -ERESTARTSYS;
1637
1638 /* check the capture file */
1639 if (gspca_dev->capt_file != file) {
1640 ret = -EBUSY;
1641 goto out;
1642 }
1643
1644 /* stop streaming */
1645 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1646 ret = -ERESTARTSYS;
1647 goto out;
1648 }
1649 gspca_dev->usb_err = 0;
1650 gspca_stream_off(gspca_dev);
1651 mutex_unlock(&gspca_dev->usb_lock);
1652
1653 /* empty the application queues */
1654 for (i = 0; i < gspca_dev->nframes; i++)
1655 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1656 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1657 gspca_dev->last_packet_type = DISCARD_PACKET;
1658 gspca_dev->sequence = 0;
1659 ret = 0;
1660 out:
1661 mutex_unlock(&gspca_dev->queue_lock);
1662 return ret;
1663 }
1664
1665 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1666 struct v4l2_jpegcompression *jpegcomp)
1667 {
1668 struct gspca_dev *gspca_dev = priv;
1669 int ret;
1670
1671 if (!gspca_dev->sd_desc->get_jcomp)
1672 return -EINVAL;
1673 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1674 return -ERESTARTSYS;
1675 gspca_dev->usb_err = 0;
1676 if (gspca_dev->present)
1677 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1678 else
1679 ret = -ENODEV;
1680 mutex_unlock(&gspca_dev->usb_lock);
1681 return ret;
1682 }
1683
1684 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1685 struct v4l2_jpegcompression *jpegcomp)
1686 {
1687 struct gspca_dev *gspca_dev = priv;
1688 int ret;
1689
1690 if (!gspca_dev->sd_desc->set_jcomp)
1691 return -EINVAL;
1692 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1693 return -ERESTARTSYS;
1694 gspca_dev->usb_err = 0;
1695 if (gspca_dev->present)
1696 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1697 else
1698 ret = -ENODEV;
1699 mutex_unlock(&gspca_dev->usb_lock);
1700 return ret;
1701 }
1702
1703 static int vidioc_g_parm(struct file *filp, void *priv,
1704 struct v4l2_streamparm *parm)
1705 {
1706 struct gspca_dev *gspca_dev = priv;
1707
1708 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1709
1710 if (gspca_dev->sd_desc->get_streamparm) {
1711 int ret;
1712
1713 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1714 return -ERESTARTSYS;
1715 gspca_dev->usb_err = 0;
1716 if (gspca_dev->present)
1717 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1718 parm);
1719 else
1720 ret = -ENODEV;
1721 mutex_unlock(&gspca_dev->usb_lock);
1722 return ret;
1723 }
1724
1725 return 0;
1726 }
1727
1728 static int vidioc_s_parm(struct file *filp, void *priv,
1729 struct v4l2_streamparm *parm)
1730 {
1731 struct gspca_dev *gspca_dev = priv;
1732 int n;
1733
1734 n = parm->parm.capture.readbuffers;
1735 if (n == 0 || n > GSPCA_MAX_FRAMES)
1736 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1737 else
1738 gspca_dev->nbufread = n;
1739
1740 if (gspca_dev->sd_desc->set_streamparm) {
1741 int ret;
1742
1743 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1744 return -ERESTARTSYS;
1745 gspca_dev->usb_err = 0;
1746 if (gspca_dev->present)
1747 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1748 parm);
1749 else
1750 ret = -ENODEV;
1751 mutex_unlock(&gspca_dev->usb_lock);
1752 return ret;
1753 }
1754
1755 return 0;
1756 }
1757
1758 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1759 static int vidiocgmbuf(struct file *file, void *priv,
1760 struct video_mbuf *mbuf)
1761 {
1762 struct gspca_dev *gspca_dev = file->private_data;
1763 int i;
1764
1765 PDEBUG(D_STREAM, "cgmbuf");
1766 if (gspca_dev->nframes == 0) {
1767 int ret;
1768
1769 {
1770 struct v4l2_format fmt;
1771
1772 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1773 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1774 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1775 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1776 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1777 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1778 if (ret != 0)
1779 return ret;
1780 }
1781 {
1782 struct v4l2_requestbuffers rb;
1783
1784 memset(&rb, 0, sizeof rb);
1785 rb.count = 4;
1786 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1787 rb.memory = V4L2_MEMORY_MMAP;
1788 ret = vidioc_reqbufs(file, priv, &rb);
1789 if (ret != 0)
1790 return ret;
1791 }
1792 }
1793 mbuf->frames = gspca_dev->nframes;
1794 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1795 for (i = 0; i < mbuf->frames; i++)
1796 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1797 return 0;
1798 }
1799 #endif
1800
1801 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1802 {
1803 struct gspca_dev *gspca_dev = file->private_data;
1804 struct gspca_frame *frame;
1805 struct page *page;
1806 unsigned long addr, start, size;
1807 int i, ret;
1808
1809 start = vma->vm_start;
1810 size = vma->vm_end - vma->vm_start;
1811 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1812
1813 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1814 return -ERESTARTSYS;
1815 if (!gspca_dev->present) {
1816 ret = -ENODEV;
1817 goto out;
1818 }
1819 if (gspca_dev->capt_file != file) {
1820 ret = -EINVAL;
1821 goto out;
1822 }
1823
1824 frame = NULL;
1825 for (i = 0; i < gspca_dev->nframes; ++i) {
1826 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1827 PDEBUG(D_STREAM, "mmap bad memory type");
1828 break;
1829 }
1830 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1831 == vma->vm_pgoff) {
1832 frame = &gspca_dev->frame[i];
1833 break;
1834 }
1835 }
1836 if (frame == NULL) {
1837 PDEBUG(D_STREAM, "mmap no frame buffer found");
1838 ret = -EINVAL;
1839 goto out;
1840 }
1841 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1842 /* v4l1 maps all the buffers */
1843 if (i != 0
1844 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1845 #endif
1846 if (size != frame->v4l2_buf.length) {
1847 PDEBUG(D_STREAM, "mmap bad size");
1848 ret = -EINVAL;
1849 goto out;
1850 }
1851
1852 /*
1853 * - VM_IO marks the area as being a mmaped region for I/O to a
1854 * device. It also prevents the region from being core dumped.
1855 */
1856 vma->vm_flags |= VM_IO;
1857
1858 addr = (unsigned long) frame->data;
1859 while (size > 0) {
1860 page = vmalloc_to_page((void *) addr);
1861 ret = vm_insert_page(vma, start, page);
1862 if (ret < 0)
1863 goto out;
1864 start += PAGE_SIZE;
1865 addr += PAGE_SIZE;
1866 size -= PAGE_SIZE;
1867 }
1868
1869 vma->vm_ops = &gspca_vm_ops;
1870 vma->vm_private_data = frame;
1871 gspca_vm_open(vma);
1872 ret = 0;
1873 out:
1874 mutex_unlock(&gspca_dev->queue_lock);
1875 return ret;
1876 }
1877
1878 /*
1879 * wait for a video frame
1880 *
1881 * If a frame is ready, its index is returned.
1882 */
1883 static int frame_wait(struct gspca_dev *gspca_dev,
1884 int nonblock_ing)
1885 {
1886 struct gspca_frame *frame;
1887 int i, j, ret;
1888
1889 /* check if a frame is ready */
1890 i = gspca_dev->fr_o;
1891 j = gspca_dev->fr_queue[i];
1892 frame = &gspca_dev->frame[j];
1893
1894 if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1895 if (nonblock_ing)
1896 return -EAGAIN;
1897
1898 /* wait till a frame is ready */
1899 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1900 (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1901 !gspca_dev->streaming || !gspca_dev->present,
1902 msecs_to_jiffies(3000));
1903 if (ret < 0)
1904 return ret;
1905 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1906 return -EIO;
1907 }
1908
1909 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1910 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1911 gspca_dev->fr_q,
1912 gspca_dev->fr_i,
1913 gspca_dev->fr_o);
1914
1915 if (gspca_dev->sd_desc->dq_callback) {
1916 mutex_lock(&gspca_dev->usb_lock);
1917 gspca_dev->usb_err = 0;
1918 if (gspca_dev->present)
1919 gspca_dev->sd_desc->dq_callback(gspca_dev);
1920 mutex_unlock(&gspca_dev->usb_lock);
1921 }
1922 return j;
1923 }
1924
1925 /*
1926 * dequeue a video buffer
1927 *
1928 * If nonblock_ing is false, block until a buffer is available.
1929 */
1930 static int vidioc_dqbuf(struct file *file, void *priv,
1931 struct v4l2_buffer *v4l2_buf)
1932 {
1933 struct gspca_dev *gspca_dev = priv;
1934 struct gspca_frame *frame;
1935 int i, ret;
1936
1937 PDEBUG(D_FRAM, "dqbuf");
1938 if (v4l2_buf->memory != gspca_dev->memory)
1939 return -EINVAL;
1940
1941 if (!gspca_dev->present)
1942 return -ENODEV;
1943
1944 /* if not streaming, be sure the application will not loop forever */
1945 if (!(file->f_flags & O_NONBLOCK)
1946 && !gspca_dev->streaming && gspca_dev->users == 1)
1947 return -EINVAL;
1948
1949 /* only the capturing file may dequeue */
1950 if (gspca_dev->capt_file != file)
1951 return -EINVAL;
1952
1953 /* only one dequeue / read at a time */
1954 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1955 return -ERESTARTSYS;
1956
1957 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1958 if (ret < 0)
1959 goto out;
1960 i = ret; /* frame index */
1961 frame = &gspca_dev->frame[i];
1962 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1963 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1964 frame->data,
1965 frame->v4l2_buf.bytesused)) {
1966 PDEBUG(D_ERR|D_STREAM,
1967 "dqbuf cp to user failed");
1968 ret = -EFAULT;
1969 goto out;
1970 }
1971 }
1972 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1973 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1974 PDEBUG(D_FRAM, "dqbuf %d", i);
1975 ret = 0;
1976 out:
1977 mutex_unlock(&gspca_dev->read_lock);
1978 return ret;
1979 }
1980
1981 /*
1982 * queue a video buffer
1983 *
1984 * Attempting to queue a buffer that has already been
1985 * queued will return -EINVAL.
1986 */
1987 static int vidioc_qbuf(struct file *file, void *priv,
1988 struct v4l2_buffer *v4l2_buf)
1989 {
1990 struct gspca_dev *gspca_dev = priv;
1991 struct gspca_frame *frame;
1992 int i, index, ret;
1993
1994 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1995
1996 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1997 return -ERESTARTSYS;
1998
1999 index = v4l2_buf->index;
2000 if ((unsigned) index >= gspca_dev->nframes) {
2001 PDEBUG(D_FRAM,
2002 "qbuf idx %d >= %d", index, gspca_dev->nframes);
2003 ret = -EINVAL;
2004 goto out;
2005 }
2006 if (v4l2_buf->memory != gspca_dev->memory) {
2007 PDEBUG(D_FRAM, "qbuf bad memory type");
2008 ret = -EINVAL;
2009 goto out;
2010 }
2011
2012 frame = &gspca_dev->frame[index];
2013 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
2014 PDEBUG(D_FRAM, "qbuf bad state");
2015 ret = -EINVAL;
2016 goto out;
2017 }
2018
2019 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
2020
2021 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2022 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2023 frame->v4l2_buf.length = v4l2_buf->length;
2024 }
2025
2026 /* put the buffer in the 'queued' queue */
2027 i = gspca_dev->fr_q;
2028 gspca_dev->fr_queue[i] = index;
2029 if (gspca_dev->fr_i == i)
2030 gspca_dev->cur_frame = frame;
2031 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
2032 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
2033 gspca_dev->fr_q,
2034 gspca_dev->fr_i,
2035 gspca_dev->fr_o);
2036
2037 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2038 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2039 ret = 0;
2040 out:
2041 mutex_unlock(&gspca_dev->queue_lock);
2042 return ret;
2043 }
2044
2045 /*
2046 * allocate the resources for read()
2047 */
2048 static int read_alloc(struct gspca_dev *gspca_dev,
2049 struct file *file)
2050 {
2051 struct v4l2_buffer v4l2_buf;
2052 int i, ret;
2053
2054 PDEBUG(D_STREAM, "read alloc");
2055 if (gspca_dev->nframes == 0) {
2056 struct v4l2_requestbuffers rb;
2057
2058 memset(&rb, 0, sizeof rb);
2059 rb.count = gspca_dev->nbufread;
2060 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2061 rb.memory = GSPCA_MEMORY_READ;
2062 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2063 if (ret != 0) {
2064 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2065 return ret;
2066 }
2067 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2068 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2069 v4l2_buf.memory = GSPCA_MEMORY_READ;
2070 for (i = 0; i < gspca_dev->nbufread; i++) {
2071 v4l2_buf.index = i;
2072 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2073 if (ret != 0) {
2074 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2075 return ret;
2076 }
2077 }
2078 gspca_dev->memory = GSPCA_MEMORY_READ;
2079 }
2080
2081 /* start streaming */
2082 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2083 if (ret != 0)
2084 PDEBUG(D_STREAM, "read streamon err %d", ret);
2085 return ret;
2086 }
2087
2088 static unsigned int dev_poll(struct file *file, poll_table *wait)
2089 {
2090 struct gspca_dev *gspca_dev = file->private_data;
2091 int i, ret;
2092
2093 PDEBUG(D_FRAM, "poll");
2094
2095 poll_wait(file, &gspca_dev->wq, wait);
2096
2097 /* if reqbufs is not done, the user would use read() */
2098 if (gspca_dev->nframes == 0) {
2099 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2100 return POLLERR; /* not the 1st time */
2101 ret = read_alloc(gspca_dev, file);
2102 if (ret != 0)
2103 return POLLERR;
2104 }
2105
2106 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2107 return POLLERR;
2108
2109 /* check the next incoming buffer */
2110 i = gspca_dev->fr_o;
2111 i = gspca_dev->fr_queue[i];
2112 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
2113 ret = POLLIN | POLLRDNORM; /* something to read */
2114 else
2115 ret = 0;
2116 mutex_unlock(&gspca_dev->queue_lock);
2117 if (!gspca_dev->present)
2118 return POLLHUP;
2119 return ret;
2120 }
2121
2122 static ssize_t dev_read(struct file *file, char __user *data,
2123 size_t count, loff_t *ppos)
2124 {
2125 struct gspca_dev *gspca_dev = file->private_data;
2126 struct gspca_frame *frame;
2127 struct v4l2_buffer v4l2_buf;
2128 struct timeval timestamp;
2129 int n, ret, ret2;
2130
2131 PDEBUG(D_FRAM, "read (%zd)", count);
2132 if (!gspca_dev->present)
2133 return -ENODEV;
2134 switch (gspca_dev->memory) {
2135 case GSPCA_MEMORY_NO: /* first time */
2136 ret = read_alloc(gspca_dev, file);
2137 if (ret != 0)
2138 return ret;
2139 break;
2140 case GSPCA_MEMORY_READ:
2141 if (gspca_dev->capt_file == file)
2142 break;
2143 /* fall thru */
2144 default:
2145 return -EINVAL;
2146 }
2147
2148 /* get a frame */
2149 timestamp = ktime_to_timeval(ktime_get());
2150 timestamp.tv_sec--;
2151 n = 2;
2152 for (;;) {
2153 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2154 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2155 v4l2_buf.memory = GSPCA_MEMORY_READ;
2156 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2157 if (ret != 0) {
2158 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2159 return ret;
2160 }
2161
2162 /* if the process slept for more than 1 second,
2163 * get a newer frame */
2164 frame = &gspca_dev->frame[v4l2_buf.index];
2165 if (--n < 0)
2166 break; /* avoid infinite loop */
2167 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2168 break;
2169 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2170 if (ret != 0) {
2171 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2172 return ret;
2173 }
2174 }
2175
2176 /* copy the frame */
2177 if (count > frame->v4l2_buf.bytesused)
2178 count = frame->v4l2_buf.bytesused;
2179 ret = copy_to_user(data, frame->data, count);
2180 if (ret != 0) {
2181 PDEBUG(D_ERR|D_STREAM,
2182 "read cp to user lack %d / %zd", ret, count);
2183 ret = -EFAULT;
2184 goto out;
2185 }
2186 ret = count;
2187 out:
2188 /* in each case, requeue the buffer */
2189 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2190 if (ret2 != 0)
2191 return ret2;
2192 return ret;
2193 }
2194
2195 static struct v4l2_file_operations dev_fops = {
2196 .owner = THIS_MODULE,
2197 .open = dev_open,
2198 .release = dev_close,
2199 .read = dev_read,
2200 .mmap = dev_mmap,
2201 .unlocked_ioctl = video_ioctl2,
2202 .poll = dev_poll,
2203 };
2204
2205 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2206 .vidioc_querycap = vidioc_querycap,
2207 .vidioc_dqbuf = vidioc_dqbuf,
2208 .vidioc_qbuf = vidioc_qbuf,
2209 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2210 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2211 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2212 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2213 .vidioc_streamon = vidioc_streamon,
2214 .vidioc_queryctrl = vidioc_queryctrl,
2215 .vidioc_g_ctrl = vidioc_g_ctrl,
2216 .vidioc_s_ctrl = vidioc_s_ctrl,
2217 .vidioc_g_audio = vidioc_g_audio,
2218 .vidioc_s_audio = vidioc_s_audio,
2219 .vidioc_enumaudio = vidioc_enumaudio,
2220 .vidioc_querymenu = vidioc_querymenu,
2221 .vidioc_enum_input = vidioc_enum_input,
2222 .vidioc_g_input = vidioc_g_input,
2223 .vidioc_s_input = vidioc_s_input,
2224 .vidioc_reqbufs = vidioc_reqbufs,
2225 .vidioc_querybuf = vidioc_querybuf,
2226 .vidioc_streamoff = vidioc_streamoff,
2227 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2228 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2229 .vidioc_g_parm = vidioc_g_parm,
2230 .vidioc_s_parm = vidioc_s_parm,
2231 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2232 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2233 #ifdef CONFIG_VIDEO_ADV_DEBUG
2234 .vidioc_g_register = vidioc_g_register,
2235 .vidioc_s_register = vidioc_s_register,
2236 #endif
2237 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2238 #ifdef CONFIG_VIDEO_V4L1_COMPAT
2239 .vidiocgmbuf = vidiocgmbuf,
2240 #endif
2241 };
2242
2243 static struct video_device gspca_template = {
2244 .name = "gspca main driver",
2245 .fops = &dev_fops,
2246 .ioctl_ops = &dev_ioctl_ops,
2247 .release = gspca_release,
2248 };
2249
2250 /*
2251 * probe and create a new gspca device
2252 *
2253 * This function must be called by the sub-driver when it is
2254 * called for probing a new device.
2255 */
2256 int gspca_dev_probe(struct usb_interface *intf,
2257 const struct usb_device_id *id,
2258 const struct sd_desc *sd_desc,
2259 int dev_size,
2260 struct module *module)
2261 {
2262 struct usb_interface_descriptor *interface;
2263 struct gspca_dev *gspca_dev;
2264 struct usb_device *dev = interface_to_usbdev(intf);
2265 int ret;
2266
2267 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2268
2269 /* we don't handle multi-config cameras */
2270 if (dev->descriptor.bNumConfigurations != 1) {
2271 PDEBUG(D_ERR, "Too many config");
2272 return -ENODEV;
2273 }
2274
2275 /* the USB video interface must be the first one */
2276 interface = &intf->cur_altsetting->desc;
2277 if (dev->config->desc.bNumInterfaces != 1 &&
2278 interface->bInterfaceNumber != 0)
2279 return -ENODEV;
2280
2281 /* create the device */
2282 if (dev_size < sizeof *gspca_dev)
2283 dev_size = sizeof *gspca_dev;
2284 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2285 if (!gspca_dev) {
2286 err("couldn't kzalloc gspca struct");
2287 return -ENOMEM;
2288 }
2289 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2290 if (!gspca_dev->usb_buf) {
2291 err("out of memory");
2292 ret = -ENOMEM;
2293 goto out;
2294 }
2295 gspca_dev->dev = dev;
2296 gspca_dev->iface = interface->bInterfaceNumber;
2297 gspca_dev->nbalt = intf->num_altsetting;
2298 gspca_dev->sd_desc = sd_desc;
2299 gspca_dev->nbufread = 2;
2300 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2301
2302 /* configure the subdriver and initialize the USB device */
2303 ret = sd_desc->config(gspca_dev, id);
2304 if (ret < 0)
2305 goto out;
2306 ret = sd_desc->init(gspca_dev);
2307 if (ret < 0)
2308 goto out;
2309 gspca_set_default_mode(gspca_dev);
2310
2311 ret = gspca_input_connect(gspca_dev);
2312 if (ret)
2313 goto out;
2314
2315 mutex_init(&gspca_dev->usb_lock);
2316 mutex_init(&gspca_dev->read_lock);
2317 mutex_init(&gspca_dev->queue_lock);
2318 init_waitqueue_head(&gspca_dev->wq);
2319
2320 /* init video stuff */
2321 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2322 gspca_dev->vdev.parent = &intf->dev;
2323 gspca_dev->module = module;
2324 gspca_dev->present = 1;
2325 ret = video_register_device(&gspca_dev->vdev,
2326 VFL_TYPE_GRABBER,
2327 -1);
2328 if (ret < 0) {
2329 err("video_register_device err %d", ret);
2330 goto out;
2331 }
2332
2333 usb_set_intfdata(intf, gspca_dev);
2334 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2335
2336 gspca_input_create_urb(gspca_dev);
2337
2338 return 0;
2339 out:
2340 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2341 if (gspca_dev->input_dev)
2342 input_unregister_device(gspca_dev->input_dev);
2343 #endif
2344 kfree(gspca_dev->usb_buf);
2345 kfree(gspca_dev);
2346 return ret;
2347 }
2348 EXPORT_SYMBOL(gspca_dev_probe);
2349
2350 /*
2351 * USB disconnection
2352 *
2353 * This function must be called by the sub-driver
2354 * when the device disconnects, after the specific resources are freed.
2355 */
2356 void gspca_disconnect(struct usb_interface *intf)
2357 {
2358 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2359 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2360 struct input_dev *input_dev;
2361 #endif
2362
2363 PDEBUG(D_PROBE, "%s disconnect",
2364 video_device_node_name(&gspca_dev->vdev));
2365 mutex_lock(&gspca_dev->usb_lock);
2366 gspca_dev->present = 0;
2367
2368 if (gspca_dev->streaming) {
2369 destroy_urbs(gspca_dev);
2370 wake_up_interruptible(&gspca_dev->wq);
2371 }
2372
2373 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2374 gspca_input_destroy_urb(gspca_dev);
2375 input_dev = gspca_dev->input_dev;
2376 if (input_dev) {
2377 gspca_dev->input_dev = NULL;
2378 input_unregister_device(input_dev);
2379 }
2380 #endif
2381
2382 /* the device is freed at exit of this function */
2383 gspca_dev->dev = NULL;
2384 mutex_unlock(&gspca_dev->usb_lock);
2385
2386 usb_set_intfdata(intf, NULL);
2387
2388 /* release the device */
2389 /* (this will call gspca_release() immediatly or on last close) */
2390 video_unregister_device(&gspca_dev->vdev);
2391
2392 /* PDEBUG(D_PROBE, "disconnect complete"); */
2393 }
2394 EXPORT_SYMBOL(gspca_disconnect);
2395
2396 #ifdef CONFIG_PM
2397 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2398 {
2399 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2400
2401 if (!gspca_dev->streaming)
2402 return 0;
2403 gspca_dev->frozen = 1; /* avoid urb error messages */
2404 if (gspca_dev->sd_desc->stopN)
2405 gspca_dev->sd_desc->stopN(gspca_dev);
2406 destroy_urbs(gspca_dev);
2407 gspca_input_destroy_urb(gspca_dev);
2408 gspca_set_alt0(gspca_dev);
2409 if (gspca_dev->sd_desc->stop0)
2410 gspca_dev->sd_desc->stop0(gspca_dev);
2411 return 0;
2412 }
2413 EXPORT_SYMBOL(gspca_suspend);
2414
2415 int gspca_resume(struct usb_interface *intf)
2416 {
2417 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2418
2419 gspca_dev->frozen = 0;
2420 gspca_dev->sd_desc->init(gspca_dev);
2421 gspca_input_create_urb(gspca_dev);
2422 if (gspca_dev->streaming)
2423 return gspca_init_transfer(gspca_dev);
2424 return 0;
2425 }
2426 EXPORT_SYMBOL(gspca_resume);
2427 #endif
2428 /* -- cam driver utility functions -- */
2429
2430 /* auto gain and exposure algorithm based on the knee algorithm described here:
2431 http://ytse.tricolour.net/docs/LowLightOptimization.html
2432
2433 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2434 where changed. */
2435 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2436 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2437 {
2438 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2439 const struct ctrl *gain_ctrl = NULL;
2440 const struct ctrl *exposure_ctrl = NULL;
2441 const struct ctrl *autogain_ctrl = NULL;
2442 int retval = 0;
2443
2444 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2445 if (gspca_dev->ctrl_dis & (1 << i))
2446 continue;
2447 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2448 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2449 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2450 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2451 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2452 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2453 }
2454 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2455 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2456 "on cam without (auto)gain/exposure");
2457 return 0;
2458 }
2459
2460 if (gain_ctrl->get(gspca_dev, &gain) ||
2461 exposure_ctrl->get(gspca_dev, &exposure) ||
2462 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2463 return 0;
2464
2465 orig_gain = gain;
2466 orig_exposure = exposure;
2467
2468 /* If we are of a multiple of deadzone, do multiple steps to reach the
2469 desired lumination fast (with the risc of a slight overshoot) */
2470 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2471
2472 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2473 avg_lum, desired_avg_lum, steps);
2474
2475 for (i = 0; i < steps; i++) {
2476 if (avg_lum > desired_avg_lum) {
2477 if (gain > gain_knee)
2478 gain--;
2479 else if (exposure > exposure_knee)
2480 exposure--;
2481 else if (gain > gain_ctrl->qctrl.default_value)
2482 gain--;
2483 else if (exposure > exposure_ctrl->qctrl.minimum)
2484 exposure--;
2485 else if (gain > gain_ctrl->qctrl.minimum)
2486 gain--;
2487 else
2488 break;
2489 } else {
2490 if (gain < gain_ctrl->qctrl.default_value)
2491 gain++;
2492 else if (exposure < exposure_knee)
2493 exposure++;
2494 else if (gain < gain_knee)
2495 gain++;
2496 else if (exposure < exposure_ctrl->qctrl.maximum)
2497 exposure++;
2498 else if (gain < gain_ctrl->qctrl.maximum)
2499 gain++;
2500 else
2501 break;
2502 }
2503 }
2504
2505 if (gain != orig_gain) {
2506 gain_ctrl->set(gspca_dev, gain);
2507 retval = 1;
2508 }
2509 if (exposure != orig_exposure) {
2510 exposure_ctrl->set(gspca_dev, exposure);
2511 retval = 1;
2512 }
2513
2514 return retval;
2515 }
2516 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2517
2518 /* -- module insert / remove -- */
2519 static int __init gspca_init(void)
2520 {
2521 info("main v%d.%d.%d registered",
2522 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2523 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2524 DRIVER_VERSION_NUMBER & 0xff);
2525 return 0;
2526 }
2527 static void __exit gspca_exit(void)
2528 {
2529 info("main deregistered");
2530 }
2531
2532 module_init(gspca_init);
2533 module_exit(gspca_exit);
2534
2535 #ifdef GSPCA_DEBUG
2536 module_param_named(debug, gspca_debug, int, 0644);
2537 MODULE_PARM_DESC(debug,
2538 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2539 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2540 " 0x0100: v4l2");
2541 #endif
Linux kernel - Deliverables
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