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Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa...
[mirror_ubuntu-artful-kernel.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2011 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, 12, 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 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 err("Input device registration failed with error %i",
181 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_CONF, "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 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
227 ret = usb_submit_urb(urb, GFP_KERNEL);
228 if (ret < 0) {
229 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
230 goto error_submit;
231 }
232 gspca_dev->int_urb = urb;
233 return ret;
234
235 error_submit:
236 usb_free_coherent(dev,
237 urb->transfer_buffer_length,
238 urb->transfer_buffer,
239 urb->transfer_dma);
240 error_buffer:
241 usb_free_urb(urb);
242 error:
243 return ret;
244 }
245
246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
247 {
248 struct usb_interface *intf;
249 struct usb_host_interface *intf_desc;
250 struct usb_endpoint_descriptor *ep;
251 int i;
252
253 if (gspca_dev->sd_desc->int_pkt_scan) {
254 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
255 intf_desc = intf->cur_altsetting;
256 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
257 ep = &intf_desc->endpoint[i].desc;
258 if (usb_endpoint_dir_in(ep) &&
259 usb_endpoint_xfer_int(ep)) {
260
261 alloc_and_submit_int_urb(gspca_dev, ep);
262 break;
263 }
264 }
265 }
266 }
267
268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
269 {
270 struct urb *urb;
271
272 urb = gspca_dev->int_urb;
273 if (urb) {
274 gspca_dev->int_urb = NULL;
275 usb_kill_urb(urb);
276 usb_free_coherent(gspca_dev->dev,
277 urb->transfer_buffer_length,
278 urb->transfer_buffer,
279 urb->transfer_dma);
280 usb_free_urb(urb);
281 }
282 }
283 #else
284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
285 {
286 }
287
288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
289 {
290 }
291
292 static inline int gspca_input_connect(struct gspca_dev *dev)
293 {
294 return 0;
295 }
296 #endif
297
298 /*
299 * fill a video frame from an URB and resubmit
300 */
301 static void fill_frame(struct gspca_dev *gspca_dev,
302 struct urb *urb)
303 {
304 u8 *data; /* address of data in the iso message */
305 int i, len, st;
306 cam_pkt_op pkt_scan;
307
308 if (urb->status != 0) {
309 if (urb->status == -ESHUTDOWN)
310 return; /* disconnection */
311 #ifdef CONFIG_PM
312 if (gspca_dev->frozen)
313 return;
314 #endif
315 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
316 urb->status = 0;
317 goto resubmit;
318 }
319 pkt_scan = gspca_dev->sd_desc->pkt_scan;
320 for (i = 0; i < urb->number_of_packets; i++) {
321 len = urb->iso_frame_desc[i].actual_length;
322
323 /* check the packet status and length */
324 st = urb->iso_frame_desc[i].status;
325 if (st) {
326 err("ISOC data error: [%d] len=%d, status=%d",
327 i, len, st);
328 gspca_dev->last_packet_type = DISCARD_PACKET;
329 continue;
330 }
331 if (len == 0) {
332 if (gspca_dev->empty_packet == 0)
333 gspca_dev->empty_packet = 1;
334 continue;
335 }
336
337 /* let the packet be analyzed by the subdriver */
338 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
339 i, urb->iso_frame_desc[i].offset, len);
340 data = (u8 *) urb->transfer_buffer
341 + urb->iso_frame_desc[i].offset;
342 pkt_scan(gspca_dev, data, len);
343 }
344
345 resubmit:
346 /* resubmit the URB */
347 st = usb_submit_urb(urb, GFP_ATOMIC);
348 if (st < 0)
349 err("usb_submit_urb() ret %d", st);
350 }
351
352 /*
353 * ISOC message interrupt from the USB device
354 *
355 * Analyse each packet and call the subdriver for copy to the frame buffer.
356 */
357 static void isoc_irq(struct urb *urb)
358 {
359 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
360
361 PDEBUG(D_PACK, "isoc irq");
362 if (!gspca_dev->streaming)
363 return;
364 fill_frame(gspca_dev, urb);
365 }
366
367 /*
368 * bulk message interrupt from the USB device
369 */
370 static void bulk_irq(struct urb *urb)
371 {
372 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
373 int st;
374
375 PDEBUG(D_PACK, "bulk irq");
376 if (!gspca_dev->streaming)
377 return;
378 switch (urb->status) {
379 case 0:
380 break;
381 case -ESHUTDOWN:
382 return; /* disconnection */
383 default:
384 #ifdef CONFIG_PM
385 if (gspca_dev->frozen)
386 return;
387 #endif
388 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
389 urb->status = 0;
390 goto resubmit;
391 }
392
393 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
394 gspca_dev->sd_desc->pkt_scan(gspca_dev,
395 urb->transfer_buffer,
396 urb->actual_length);
397
398 resubmit:
399 /* resubmit the URB */
400 if (gspca_dev->cam.bulk_nurbs != 0) {
401 st = usb_submit_urb(urb, GFP_ATOMIC);
402 if (st < 0)
403 err("usb_submit_urb() ret %d", st);
404 }
405 }
406
407 /*
408 * add data to the current frame
409 *
410 * This function is called by the subdrivers at interrupt level.
411 *
412 * To build a frame, these ones must add
413 * - one FIRST_PACKET
414 * - 0 or many INTER_PACKETs
415 * - one LAST_PACKET
416 * DISCARD_PACKET invalidates the whole frame.
417 */
418 void gspca_frame_add(struct gspca_dev *gspca_dev,
419 enum gspca_packet_type packet_type,
420 const u8 *data,
421 int len)
422 {
423 struct gspca_frame *frame;
424 int i, j;
425
426 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
427
428 if (packet_type == FIRST_PACKET) {
429 i = atomic_read(&gspca_dev->fr_i);
430
431 /* if there are no queued buffer, discard the whole frame */
432 if (i == atomic_read(&gspca_dev->fr_q)) {
433 gspca_dev->last_packet_type = DISCARD_PACKET;
434 gspca_dev->sequence++;
435 return;
436 }
437 j = gspca_dev->fr_queue[i];
438 frame = &gspca_dev->frame[j];
439 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
440 frame->v4l2_buf.sequence = gspca_dev->sequence++;
441 gspca_dev->image = frame->data;
442 gspca_dev->image_len = 0;
443 } else {
444 switch (gspca_dev->last_packet_type) {
445 case DISCARD_PACKET:
446 if (packet_type == LAST_PACKET)
447 gspca_dev->last_packet_type = packet_type;
448 return;
449 case LAST_PACKET:
450 return;
451 }
452 }
453
454 /* append the packet to the frame buffer */
455 if (len > 0) {
456 if (gspca_dev->image_len + len > gspca_dev->frsz) {
457 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
458 gspca_dev->image_len + len,
459 gspca_dev->frsz);
460 packet_type = DISCARD_PACKET;
461 } else {
462 /* !! image is NULL only when last pkt is LAST or DISCARD
463 if (gspca_dev->image == NULL) {
464 err("gspca_frame_add() image == NULL");
465 return;
466 }
467 */
468 memcpy(gspca_dev->image + gspca_dev->image_len,
469 data, len);
470 gspca_dev->image_len += len;
471 }
472 }
473 gspca_dev->last_packet_type = packet_type;
474
475 /* if last packet, invalidate packet concatenation until
476 * next first packet, wake up the application and advance
477 * in the queue */
478 if (packet_type == LAST_PACKET) {
479 i = atomic_read(&gspca_dev->fr_i);
480 j = gspca_dev->fr_queue[i];
481 frame = &gspca_dev->frame[j];
482 frame->v4l2_buf.bytesused = gspca_dev->image_len;
483 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
484 | V4L2_BUF_FLAG_DONE)
485 & ~V4L2_BUF_FLAG_QUEUED;
486 i = (i + 1) % GSPCA_MAX_FRAMES;
487 atomic_set(&gspca_dev->fr_i, i);
488 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
489 PDEBUG(D_FRAM, "frame complete len:%d",
490 frame->v4l2_buf.bytesused);
491 gspca_dev->image = NULL;
492 gspca_dev->image_len = 0;
493 }
494 }
495 EXPORT_SYMBOL(gspca_frame_add);
496
497 static int gspca_is_compressed(__u32 format)
498 {
499 switch (format) {
500 case V4L2_PIX_FMT_MJPEG:
501 case V4L2_PIX_FMT_JPEG:
502 case V4L2_PIX_FMT_SPCA561:
503 case V4L2_PIX_FMT_PAC207:
504 case V4L2_PIX_FMT_MR97310A:
505 return 1;
506 }
507 return 0;
508 }
509
510 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
511 enum v4l2_memory memory, unsigned int count)
512 {
513 struct gspca_frame *frame;
514 unsigned int frsz;
515 int i;
516
517 i = gspca_dev->curr_mode;
518 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
519 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
520 frsz = PAGE_ALIGN(frsz);
521 if (count >= GSPCA_MAX_FRAMES)
522 count = GSPCA_MAX_FRAMES - 1;
523 gspca_dev->frbuf = vmalloc_32(frsz * count);
524 if (!gspca_dev->frbuf) {
525 err("frame alloc failed");
526 return -ENOMEM;
527 }
528 gspca_dev->capt_file = file;
529 gspca_dev->memory = memory;
530 gspca_dev->frsz = frsz;
531 gspca_dev->nframes = count;
532 for (i = 0; i < count; i++) {
533 frame = &gspca_dev->frame[i];
534 frame->v4l2_buf.index = i;
535 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
536 frame->v4l2_buf.flags = 0;
537 frame->v4l2_buf.field = V4L2_FIELD_NONE;
538 frame->v4l2_buf.length = frsz;
539 frame->v4l2_buf.memory = memory;
540 frame->v4l2_buf.sequence = 0;
541 frame->data = gspca_dev->frbuf + i * frsz;
542 frame->v4l2_buf.m.offset = i * frsz;
543 }
544 atomic_set(&gspca_dev->fr_q, 0);
545 atomic_set(&gspca_dev->fr_i, 0);
546 gspca_dev->fr_o = 0;
547 return 0;
548 }
549
550 static void frame_free(struct gspca_dev *gspca_dev)
551 {
552 int i;
553
554 PDEBUG(D_STREAM, "frame free");
555 if (gspca_dev->frbuf != NULL) {
556 vfree(gspca_dev->frbuf);
557 gspca_dev->frbuf = NULL;
558 for (i = 0; i < gspca_dev->nframes; i++)
559 gspca_dev->frame[i].data = NULL;
560 }
561 gspca_dev->nframes = 0;
562 gspca_dev->frsz = 0;
563 gspca_dev->capt_file = NULL;
564 gspca_dev->memory = GSPCA_MEMORY_NO;
565 }
566
567 static void destroy_urbs(struct gspca_dev *gspca_dev)
568 {
569 struct urb *urb;
570 unsigned int i;
571
572 PDEBUG(D_STREAM, "kill transfer");
573 for (i = 0; i < MAX_NURBS; i++) {
574 urb = gspca_dev->urb[i];
575 if (urb == NULL)
576 break;
577
578 gspca_dev->urb[i] = NULL;
579 usb_kill_urb(urb);
580 if (urb->transfer_buffer != NULL)
581 usb_free_coherent(gspca_dev->dev,
582 urb->transfer_buffer_length,
583 urb->transfer_buffer,
584 urb->transfer_dma);
585 usb_free_urb(urb);
586 }
587 }
588
589 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
590 {
591 int ret;
592
593 if (gspca_dev->alt == 0)
594 return 0;
595 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
596 if (ret < 0)
597 err("set alt 0 err %d", ret);
598 return ret;
599 }
600
601 /* Note: both the queue and the usb locks should be held when calling this */
602 static void gspca_stream_off(struct gspca_dev *gspca_dev)
603 {
604 gspca_dev->streaming = 0;
605 if (gspca_dev->present) {
606 if (gspca_dev->sd_desc->stopN)
607 gspca_dev->sd_desc->stopN(gspca_dev);
608 destroy_urbs(gspca_dev);
609 gspca_input_destroy_urb(gspca_dev);
610 gspca_set_alt0(gspca_dev);
611 gspca_input_create_urb(gspca_dev);
612 }
613
614 /* always call stop0 to free the subdriver's resources */
615 if (gspca_dev->sd_desc->stop0)
616 gspca_dev->sd_desc->stop0(gspca_dev);
617 PDEBUG(D_STREAM, "stream off OK");
618 }
619
620 /*
621 * look for an input transfer endpoint in an alternate setting
622 */
623 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
624 int xfer)
625 {
626 struct usb_host_endpoint *ep;
627 int i, attr;
628
629 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
630 ep = &alt->endpoint[i];
631 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
632 if (attr == xfer
633 && ep->desc.wMaxPacketSize != 0
634 && usb_endpoint_dir_in(&ep->desc))
635 return ep;
636 }
637 return NULL;
638 }
639
640 /*
641 * look for an input (isoc or bulk) endpoint
642 *
643 * The endpoint is defined by the subdriver.
644 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
645 * This routine may be called many times when the bandwidth is too small
646 * (the bandwidth is checked on urb submit).
647 */
648 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
649 {
650 struct usb_interface *intf;
651 struct usb_host_endpoint *ep;
652 int xfer, i, ret;
653
654 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
655 ep = NULL;
656 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
657 : USB_ENDPOINT_XFER_ISOC;
658 i = gspca_dev->alt; /* previous alt setting */
659 if (gspca_dev->cam.reverse_alts) {
660 while (++i < gspca_dev->nbalt) {
661 ep = alt_xfer(&intf->altsetting[i], xfer);
662 if (ep)
663 break;
664 }
665 } else {
666 while (--i >= 0) {
667 ep = alt_xfer(&intf->altsetting[i], xfer);
668 if (ep)
669 break;
670 }
671 }
672 if (ep == NULL) {
673 err("no transfer endpoint found");
674 return NULL;
675 }
676 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
677 i, ep->desc.bEndpointAddress);
678 gspca_dev->alt = i; /* memorize the current alt setting */
679 if (gspca_dev->nbalt > 1) {
680 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
681 if (ret < 0) {
682 err("set alt %d err %d", i, ret);
683 ep = NULL;
684 }
685 }
686 return ep;
687 }
688
689 /*
690 * create the URBs for image transfer
691 */
692 static int create_urbs(struct gspca_dev *gspca_dev,
693 struct usb_host_endpoint *ep)
694 {
695 struct urb *urb;
696 int n, nurbs, i, psize, npkt, bsize;
697
698 /* calculate the packet size and the number of packets */
699 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
700
701 if (!gspca_dev->cam.bulk) { /* isoc */
702
703 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
704 if (gspca_dev->pkt_size == 0)
705 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
706 else
707 psize = gspca_dev->pkt_size;
708 npkt = gspca_dev->cam.npkt;
709 if (npkt == 0)
710 npkt = 32; /* default value */
711 bsize = psize * npkt;
712 PDEBUG(D_STREAM,
713 "isoc %d pkts size %d = bsize:%d",
714 npkt, psize, bsize);
715 nurbs = DEF_NURBS;
716 } else { /* bulk */
717 npkt = 0;
718 bsize = gspca_dev->cam.bulk_size;
719 if (bsize == 0)
720 bsize = psize;
721 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
722 if (gspca_dev->cam.bulk_nurbs != 0)
723 nurbs = gspca_dev->cam.bulk_nurbs;
724 else
725 nurbs = 1;
726 }
727
728 for (n = 0; n < nurbs; n++) {
729 urb = usb_alloc_urb(npkt, GFP_KERNEL);
730 if (!urb) {
731 err("usb_alloc_urb failed");
732 return -ENOMEM;
733 }
734 gspca_dev->urb[n] = urb;
735 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
736 bsize,
737 GFP_KERNEL,
738 &urb->transfer_dma);
739
740 if (urb->transfer_buffer == NULL) {
741 err("usb_alloc_coherent failed");
742 return -ENOMEM;
743 }
744 urb->dev = gspca_dev->dev;
745 urb->context = gspca_dev;
746 urb->transfer_buffer_length = bsize;
747 if (npkt != 0) { /* ISOC */
748 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
749 ep->desc.bEndpointAddress);
750 urb->transfer_flags = URB_ISO_ASAP
751 | URB_NO_TRANSFER_DMA_MAP;
752 urb->interval = ep->desc.bInterval;
753 urb->complete = isoc_irq;
754 urb->number_of_packets = npkt;
755 for (i = 0; i < npkt; i++) {
756 urb->iso_frame_desc[i].length = psize;
757 urb->iso_frame_desc[i].offset = psize * i;
758 }
759 } else { /* bulk */
760 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
761 ep->desc.bEndpointAddress);
762 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
763 urb->complete = bulk_irq;
764 }
765 }
766 return 0;
767 }
768
769 /*
770 * start the USB transfer
771 */
772 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
773 {
774 struct usb_host_endpoint *ep;
775 struct urb *urb;
776 int n, ret;
777
778 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
779 return -ERESTARTSYS;
780
781 if (!gspca_dev->present) {
782 ret = -ENODEV;
783 goto unlock;
784 }
785
786 /* reset the streaming variables */
787 gspca_dev->image = NULL;
788 gspca_dev->image_len = 0;
789 gspca_dev->last_packet_type = DISCARD_PACKET;
790 gspca_dev->sequence = 0;
791
792 gspca_dev->usb_err = 0;
793
794 /* set the higher alternate setting and
795 * loop until urb submit succeeds */
796 if (gspca_dev->cam.reverse_alts)
797 gspca_dev->alt = 0;
798 else
799 gspca_dev->alt = gspca_dev->nbalt;
800
801 if (gspca_dev->sd_desc->isoc_init) {
802 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
803 if (ret < 0)
804 goto unlock;
805 }
806
807 gspca_input_destroy_urb(gspca_dev);
808 ep = get_ep(gspca_dev);
809 if (ep == NULL) {
810 ret = -EIO;
811 goto out;
812 }
813 for (;;) {
814 if (!gspca_dev->cam.no_urb_create) {
815 PDEBUG(D_STREAM, "init transfer alt %d",
816 gspca_dev->alt);
817 ret = create_urbs(gspca_dev, ep);
818 if (ret < 0) {
819 destroy_urbs(gspca_dev);
820 goto out;
821 }
822 }
823
824 /* clear the bulk endpoint */
825 if (gspca_dev->cam.bulk)
826 usb_clear_halt(gspca_dev->dev,
827 gspca_dev->urb[0]->pipe);
828
829 /* start the cam */
830 ret = gspca_dev->sd_desc->start(gspca_dev);
831 if (ret < 0) {
832 destroy_urbs(gspca_dev);
833 goto out;
834 }
835 gspca_dev->streaming = 1;
836
837 /* some bulk transfers are started by the subdriver */
838 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
839 break;
840
841 /* submit the URBs */
842 for (n = 0; n < MAX_NURBS; n++) {
843 urb = gspca_dev->urb[n];
844 if (urb == NULL)
845 break;
846 ret = usb_submit_urb(urb, GFP_KERNEL);
847 if (ret < 0)
848 break;
849 }
850 if (ret >= 0)
851 break;
852 gspca_stream_off(gspca_dev);
853 if (ret != -ENOSPC) {
854 err("usb_submit_urb alt %d err %d",
855 gspca_dev->alt, ret);
856 goto out;
857 }
858
859 /* the bandwidth is not wide enough
860 * negociate or try a lower alternate setting */
861 PDEBUG(D_ERR|D_STREAM,
862 "bandwidth not wide enough - trying again");
863 msleep(20); /* wait for kill complete */
864 if (gspca_dev->sd_desc->isoc_nego) {
865 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
866 if (ret < 0)
867 goto out;
868 } else {
869 ep = get_ep(gspca_dev);
870 if (ep == NULL) {
871 ret = -EIO;
872 goto out;
873 }
874 }
875 }
876 out:
877 gspca_input_create_urb(gspca_dev);
878 unlock:
879 mutex_unlock(&gspca_dev->usb_lock);
880 return ret;
881 }
882
883 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
884 {
885 struct gspca_ctrl *ctrl;
886 int i;
887
888 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
889 gspca_dev->curr_mode = i;
890 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
891 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
892 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
893
894 /* set the current control values to their default values
895 * which may have changed in sd_init() */
896 ctrl = gspca_dev->cam.ctrls;
897 if (ctrl != NULL) {
898 for (i = 0;
899 i < gspca_dev->sd_desc->nctrls;
900 i++, ctrl++)
901 ctrl->val = ctrl->def;
902 }
903 }
904
905 static int wxh_to_mode(struct gspca_dev *gspca_dev,
906 int width, int height)
907 {
908 int i;
909
910 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
911 if (width >= gspca_dev->cam.cam_mode[i].width
912 && height >= gspca_dev->cam.cam_mode[i].height)
913 break;
914 }
915 return i;
916 }
917
918 /*
919 * search a mode with the right pixel format
920 */
921 static int gspca_get_mode(struct gspca_dev *gspca_dev,
922 int mode,
923 int pixfmt)
924 {
925 int modeU, modeD;
926
927 modeU = modeD = mode;
928 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
929 if (--modeD >= 0) {
930 if (gspca_dev->cam.cam_mode[modeD].pixelformat
931 == pixfmt)
932 return modeD;
933 }
934 if (++modeU < gspca_dev->cam.nmodes) {
935 if (gspca_dev->cam.cam_mode[modeU].pixelformat
936 == pixfmt)
937 return modeU;
938 }
939 }
940 return -EINVAL;
941 }
942
943 #ifdef CONFIG_VIDEO_ADV_DEBUG
944 static int vidioc_g_register(struct file *file, void *priv,
945 struct v4l2_dbg_register *reg)
946 {
947 int ret;
948 struct gspca_dev *gspca_dev = priv;
949
950 if (!gspca_dev->sd_desc->get_chip_ident)
951 return -EINVAL;
952
953 if (!gspca_dev->sd_desc->get_register)
954 return -EINVAL;
955
956 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
957 return -ERESTARTSYS;
958 gspca_dev->usb_err = 0;
959 if (gspca_dev->present)
960 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
961 else
962 ret = -ENODEV;
963 mutex_unlock(&gspca_dev->usb_lock);
964
965 return ret;
966 }
967
968 static int vidioc_s_register(struct file *file, void *priv,
969 struct v4l2_dbg_register *reg)
970 {
971 int ret;
972 struct gspca_dev *gspca_dev = priv;
973
974 if (!gspca_dev->sd_desc->get_chip_ident)
975 return -EINVAL;
976
977 if (!gspca_dev->sd_desc->set_register)
978 return -EINVAL;
979
980 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
981 return -ERESTARTSYS;
982 gspca_dev->usb_err = 0;
983 if (gspca_dev->present)
984 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
985 else
986 ret = -ENODEV;
987 mutex_unlock(&gspca_dev->usb_lock);
988
989 return ret;
990 }
991 #endif
992
993 static int vidioc_g_chip_ident(struct file *file, void *priv,
994 struct v4l2_dbg_chip_ident *chip)
995 {
996 int ret;
997 struct gspca_dev *gspca_dev = priv;
998
999 if (!gspca_dev->sd_desc->get_chip_ident)
1000 return -EINVAL;
1001
1002 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1003 return -ERESTARTSYS;
1004 gspca_dev->usb_err = 0;
1005 if (gspca_dev->present)
1006 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1007 else
1008 ret = -ENODEV;
1009 mutex_unlock(&gspca_dev->usb_lock);
1010
1011 return ret;
1012 }
1013
1014 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1015 struct v4l2_fmtdesc *fmtdesc)
1016 {
1017 struct gspca_dev *gspca_dev = priv;
1018 int i, j, index;
1019 __u32 fmt_tb[8];
1020
1021 /* give an index to each format */
1022 index = 0;
1023 j = 0;
1024 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1025 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1026 j = 0;
1027 for (;;) {
1028 if (fmt_tb[j] == fmt_tb[index])
1029 break;
1030 j++;
1031 }
1032 if (j == index) {
1033 if (fmtdesc->index == index)
1034 break; /* new format */
1035 index++;
1036 if (index >= ARRAY_SIZE(fmt_tb))
1037 return -EINVAL;
1038 }
1039 }
1040 if (i < 0)
1041 return -EINVAL; /* no more format */
1042
1043 fmtdesc->pixelformat = fmt_tb[index];
1044 if (gspca_is_compressed(fmt_tb[index]))
1045 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1046 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1047 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1048 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1049 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1050 fmtdesc->description[4] = '\0';
1051 return 0;
1052 }
1053
1054 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1055 struct v4l2_format *fmt)
1056 {
1057 struct gspca_dev *gspca_dev = priv;
1058 int mode;
1059
1060 mode = gspca_dev->curr_mode;
1061 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1062 sizeof fmt->fmt.pix);
1063 return 0;
1064 }
1065
1066 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1067 struct v4l2_format *fmt)
1068 {
1069 int w, h, mode, mode2;
1070
1071 w = fmt->fmt.pix.width;
1072 h = fmt->fmt.pix.height;
1073
1074 #ifdef GSPCA_DEBUG
1075 if (gspca_debug & D_CONF)
1076 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1077 #endif
1078 /* search the closest mode for width and height */
1079 mode = wxh_to_mode(gspca_dev, w, h);
1080
1081 /* OK if right palette */
1082 if (gspca_dev->cam.cam_mode[mode].pixelformat
1083 != fmt->fmt.pix.pixelformat) {
1084
1085 /* else, search the closest mode with the same pixel format */
1086 mode2 = gspca_get_mode(gspca_dev, mode,
1087 fmt->fmt.pix.pixelformat);
1088 if (mode2 >= 0)
1089 mode = mode2;
1090 /* else
1091 ; * no chance, return this mode */
1092 }
1093 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1094 sizeof fmt->fmt.pix);
1095 return mode; /* used when s_fmt */
1096 }
1097
1098 static int vidioc_try_fmt_vid_cap(struct file *file,
1099 void *priv,
1100 struct v4l2_format *fmt)
1101 {
1102 struct gspca_dev *gspca_dev = priv;
1103 int ret;
1104
1105 ret = try_fmt_vid_cap(gspca_dev, fmt);
1106 if (ret < 0)
1107 return ret;
1108 return 0;
1109 }
1110
1111 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1112 struct v4l2_format *fmt)
1113 {
1114 struct gspca_dev *gspca_dev = priv;
1115 int ret;
1116
1117 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1118 return -ERESTARTSYS;
1119
1120 ret = try_fmt_vid_cap(gspca_dev, fmt);
1121 if (ret < 0)
1122 goto out;
1123
1124 if (gspca_dev->nframes != 0
1125 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1126 ret = -EINVAL;
1127 goto out;
1128 }
1129
1130 if (ret == gspca_dev->curr_mode) {
1131 ret = 0;
1132 goto out; /* same mode */
1133 }
1134
1135 if (gspca_dev->streaming) {
1136 ret = -EBUSY;
1137 goto out;
1138 }
1139 gspca_dev->width = fmt->fmt.pix.width;
1140 gspca_dev->height = fmt->fmt.pix.height;
1141 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1142 gspca_dev->curr_mode = ret;
1143
1144 ret = 0;
1145 out:
1146 mutex_unlock(&gspca_dev->queue_lock);
1147 return ret;
1148 }
1149
1150 static int vidioc_enum_framesizes(struct file *file, void *priv,
1151 struct v4l2_frmsizeenum *fsize)
1152 {
1153 struct gspca_dev *gspca_dev = priv;
1154 int i;
1155 __u32 index = 0;
1156
1157 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1158 if (fsize->pixel_format !=
1159 gspca_dev->cam.cam_mode[i].pixelformat)
1160 continue;
1161
1162 if (fsize->index == index) {
1163 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1164 fsize->discrete.width =
1165 gspca_dev->cam.cam_mode[i].width;
1166 fsize->discrete.height =
1167 gspca_dev->cam.cam_mode[i].height;
1168 return 0;
1169 }
1170 index++;
1171 }
1172
1173 return -EINVAL;
1174 }
1175
1176 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1177 struct v4l2_frmivalenum *fival)
1178 {
1179 struct gspca_dev *gspca_dev = priv;
1180 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1181 __u32 i;
1182
1183 if (gspca_dev->cam.mode_framerates == NULL ||
1184 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1185 return -EINVAL;
1186
1187 if (fival->pixel_format !=
1188 gspca_dev->cam.cam_mode[mode].pixelformat)
1189 return -EINVAL;
1190
1191 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1192 if (fival->index == i) {
1193 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1194 fival->discrete.numerator = 1;
1195 fival->discrete.denominator =
1196 gspca_dev->cam.mode_framerates[mode].rates[i];
1197 return 0;
1198 }
1199 }
1200
1201 return -EINVAL;
1202 }
1203
1204 static void gspca_release(struct video_device *vfd)
1205 {
1206 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1207
1208 PDEBUG(D_PROBE, "%s released",
1209 video_device_node_name(&gspca_dev->vdev));
1210
1211 kfree(gspca_dev->usb_buf);
1212 kfree(gspca_dev);
1213 }
1214
1215 static int dev_open(struct file *file)
1216 {
1217 struct gspca_dev *gspca_dev;
1218
1219 PDEBUG(D_STREAM, "[%s] open", current->comm);
1220 gspca_dev = (struct gspca_dev *) video_devdata(file);
1221 if (!gspca_dev->present)
1222 return -ENODEV;
1223
1224 /* protect the subdriver against rmmod */
1225 if (!try_module_get(gspca_dev->module))
1226 return -ENODEV;
1227
1228 file->private_data = gspca_dev;
1229 #ifdef GSPCA_DEBUG
1230 /* activate the v4l2 debug */
1231 if (gspca_debug & D_V4L2)
1232 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1233 | V4L2_DEBUG_IOCTL_ARG;
1234 else
1235 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1236 | V4L2_DEBUG_IOCTL_ARG);
1237 #endif
1238 return 0;
1239 }
1240
1241 static int dev_close(struct file *file)
1242 {
1243 struct gspca_dev *gspca_dev = file->private_data;
1244
1245 PDEBUG(D_STREAM, "[%s] close", current->comm);
1246 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1247 return -ERESTARTSYS;
1248
1249 /* if the file did the capture, free the streaming resources */
1250 if (gspca_dev->capt_file == file) {
1251 if (gspca_dev->streaming) {
1252 mutex_lock(&gspca_dev->usb_lock);
1253 gspca_dev->usb_err = 0;
1254 gspca_stream_off(gspca_dev);
1255 mutex_unlock(&gspca_dev->usb_lock);
1256 }
1257 frame_free(gspca_dev);
1258 }
1259 file->private_data = NULL;
1260 module_put(gspca_dev->module);
1261 mutex_unlock(&gspca_dev->queue_lock);
1262
1263 PDEBUG(D_STREAM, "close done");
1264
1265 return 0;
1266 }
1267
1268 static int vidioc_querycap(struct file *file, void *priv,
1269 struct v4l2_capability *cap)
1270 {
1271 struct gspca_dev *gspca_dev = priv;
1272 int ret;
1273
1274 /* protect the access to the usb device */
1275 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1276 return -ERESTARTSYS;
1277 if (!gspca_dev->present) {
1278 ret = -ENODEV;
1279 goto out;
1280 }
1281 strncpy((char *) cap->driver, gspca_dev->sd_desc->name,
1282 sizeof cap->driver);
1283 if (gspca_dev->dev->product != NULL) {
1284 strncpy((char *) cap->card, gspca_dev->dev->product,
1285 sizeof cap->card);
1286 } else {
1287 snprintf((char *) cap->card, sizeof cap->card,
1288 "USB Camera (%04x:%04x)",
1289 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1290 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1291 }
1292 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1293 sizeof(cap->bus_info));
1294 cap->version = DRIVER_VERSION_NUMBER;
1295 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1296 | V4L2_CAP_STREAMING
1297 | V4L2_CAP_READWRITE;
1298 ret = 0;
1299 out:
1300 mutex_unlock(&gspca_dev->usb_lock);
1301 return ret;
1302 }
1303
1304 static int get_ctrl(struct gspca_dev *gspca_dev,
1305 int id)
1306 {
1307 const struct ctrl *ctrls;
1308 int i;
1309
1310 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1311 i < gspca_dev->sd_desc->nctrls;
1312 i++, ctrls++) {
1313 if (gspca_dev->ctrl_dis & (1 << i))
1314 continue;
1315 if (id == ctrls->qctrl.id)
1316 return i;
1317 }
1318 return -1;
1319 }
1320
1321 static int vidioc_queryctrl(struct file *file, void *priv,
1322 struct v4l2_queryctrl *q_ctrl)
1323 {
1324 struct gspca_dev *gspca_dev = priv;
1325 const struct ctrl *ctrls;
1326 struct gspca_ctrl *gspca_ctrl;
1327 int i, idx;
1328 u32 id;
1329
1330 id = q_ctrl->id;
1331 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1332 id &= V4L2_CTRL_ID_MASK;
1333 id++;
1334 idx = -1;
1335 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1336 if (gspca_dev->ctrl_dis & (1 << i))
1337 continue;
1338 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1339 continue;
1340 if (idx >= 0
1341 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1342 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1343 continue;
1344 idx = i;
1345 }
1346 } else {
1347 idx = get_ctrl(gspca_dev, id);
1348 }
1349 if (idx < 0)
1350 return -EINVAL;
1351 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1352 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1353 if (gspca_dev->cam.ctrls != NULL) {
1354 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1355 q_ctrl->default_value = gspca_ctrl->def;
1356 q_ctrl->minimum = gspca_ctrl->min;
1357 q_ctrl->maximum = gspca_ctrl->max;
1358 }
1359 if (gspca_dev->ctrl_inac & (1 << idx))
1360 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1361 return 0;
1362 }
1363
1364 static int vidioc_s_ctrl(struct file *file, void *priv,
1365 struct v4l2_control *ctrl)
1366 {
1367 struct gspca_dev *gspca_dev = priv;
1368 const struct ctrl *ctrls;
1369 struct gspca_ctrl *gspca_ctrl;
1370 int idx, ret;
1371
1372 idx = get_ctrl(gspca_dev, ctrl->id);
1373 if (idx < 0)
1374 return -EINVAL;
1375 if (gspca_dev->ctrl_inac & (1 << idx))
1376 return -EINVAL;
1377 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1378 if (gspca_dev->cam.ctrls != NULL) {
1379 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1380 if (ctrl->value < gspca_ctrl->min
1381 || ctrl->value > gspca_ctrl->max)
1382 return -ERANGE;
1383 } else {
1384 gspca_ctrl = NULL;
1385 if (ctrl->value < ctrls->qctrl.minimum
1386 || ctrl->value > ctrls->qctrl.maximum)
1387 return -ERANGE;
1388 }
1389 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1390 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1391 return -ERESTARTSYS;
1392 if (!gspca_dev->present) {
1393 ret = -ENODEV;
1394 goto out;
1395 }
1396 gspca_dev->usb_err = 0;
1397 if (ctrls->set != NULL) {
1398 ret = ctrls->set(gspca_dev, ctrl->value);
1399 goto out;
1400 }
1401 if (gspca_ctrl != NULL) {
1402 gspca_ctrl->val = ctrl->value;
1403 if (ctrls->set_control != NULL
1404 && gspca_dev->streaming)
1405 ctrls->set_control(gspca_dev);
1406 }
1407 ret = gspca_dev->usb_err;
1408 out:
1409 mutex_unlock(&gspca_dev->usb_lock);
1410 return ret;
1411 }
1412
1413 static int vidioc_g_ctrl(struct file *file, void *priv,
1414 struct v4l2_control *ctrl)
1415 {
1416 struct gspca_dev *gspca_dev = priv;
1417 const struct ctrl *ctrls;
1418 int idx, ret;
1419
1420 idx = get_ctrl(gspca_dev, ctrl->id);
1421 if (idx < 0)
1422 return -EINVAL;
1423 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1424
1425 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1426 return -ERESTARTSYS;
1427 if (!gspca_dev->present) {
1428 ret = -ENODEV;
1429 goto out;
1430 }
1431 gspca_dev->usb_err = 0;
1432 if (ctrls->get != NULL) {
1433 ret = ctrls->get(gspca_dev, &ctrl->value);
1434 goto out;
1435 }
1436 if (gspca_dev->cam.ctrls != NULL)
1437 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1438 ret = 0;
1439 out:
1440 mutex_unlock(&gspca_dev->usb_lock);
1441 return ret;
1442 }
1443
1444 static int vidioc_querymenu(struct file *file, void *priv,
1445 struct v4l2_querymenu *qmenu)
1446 {
1447 struct gspca_dev *gspca_dev = priv;
1448
1449 if (!gspca_dev->sd_desc->querymenu)
1450 return -EINVAL;
1451 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1452 }
1453
1454 static int vidioc_enum_input(struct file *file, void *priv,
1455 struct v4l2_input *input)
1456 {
1457 struct gspca_dev *gspca_dev = priv;
1458
1459 if (input->index != 0)
1460 return -EINVAL;
1461 input->type = V4L2_INPUT_TYPE_CAMERA;
1462 input->status = gspca_dev->cam.input_flags;
1463 strncpy(input->name, gspca_dev->sd_desc->name,
1464 sizeof input->name);
1465 return 0;
1466 }
1467
1468 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1469 {
1470 *i = 0;
1471 return 0;
1472 }
1473
1474 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1475 {
1476 if (i > 0)
1477 return -EINVAL;
1478 return (0);
1479 }
1480
1481 static int vidioc_reqbufs(struct file *file, void *priv,
1482 struct v4l2_requestbuffers *rb)
1483 {
1484 struct gspca_dev *gspca_dev = priv;
1485 int i, ret = 0, streaming;
1486
1487 i = rb->memory; /* (avoid compilation warning) */
1488 switch (i) {
1489 case GSPCA_MEMORY_READ: /* (internal call) */
1490 case V4L2_MEMORY_MMAP:
1491 case V4L2_MEMORY_USERPTR:
1492 break;
1493 default:
1494 return -EINVAL;
1495 }
1496 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1497 return -ERESTARTSYS;
1498
1499 if (gspca_dev->memory != GSPCA_MEMORY_NO
1500 && gspca_dev->memory != GSPCA_MEMORY_READ
1501 && gspca_dev->memory != rb->memory) {
1502 ret = -EBUSY;
1503 goto out;
1504 }
1505
1506 /* only one file may do the capture */
1507 if (gspca_dev->capt_file != NULL
1508 && gspca_dev->capt_file != file) {
1509 ret = -EBUSY;
1510 goto out;
1511 }
1512
1513 /* if allocated, the buffers must not be mapped */
1514 for (i = 0; i < gspca_dev->nframes; i++) {
1515 if (gspca_dev->frame[i].vma_use_count) {
1516 ret = -EBUSY;
1517 goto out;
1518 }
1519 }
1520
1521 /* stop streaming */
1522 streaming = gspca_dev->streaming;
1523 if (streaming) {
1524 mutex_lock(&gspca_dev->usb_lock);
1525 gspca_dev->usb_err = 0;
1526 gspca_stream_off(gspca_dev);
1527 mutex_unlock(&gspca_dev->usb_lock);
1528
1529 /* Don't restart the stream when switching from read
1530 * to mmap mode */
1531 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1532 streaming = 0;
1533 }
1534
1535 /* free the previous allocated buffers, if any */
1536 if (gspca_dev->nframes != 0)
1537 frame_free(gspca_dev);
1538 if (rb->count == 0) /* unrequest */
1539 goto out;
1540 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1541 if (ret == 0) {
1542 rb->count = gspca_dev->nframes;
1543 if (streaming)
1544 ret = gspca_init_transfer(gspca_dev);
1545 }
1546 out:
1547 mutex_unlock(&gspca_dev->queue_lock);
1548 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1549 return ret;
1550 }
1551
1552 static int vidioc_querybuf(struct file *file, void *priv,
1553 struct v4l2_buffer *v4l2_buf)
1554 {
1555 struct gspca_dev *gspca_dev = priv;
1556 struct gspca_frame *frame;
1557
1558 if (v4l2_buf->index < 0
1559 || v4l2_buf->index >= gspca_dev->nframes)
1560 return -EINVAL;
1561
1562 frame = &gspca_dev->frame[v4l2_buf->index];
1563 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1564 return 0;
1565 }
1566
1567 static int vidioc_streamon(struct file *file, void *priv,
1568 enum v4l2_buf_type buf_type)
1569 {
1570 struct gspca_dev *gspca_dev = priv;
1571 int ret;
1572
1573 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1574 return -EINVAL;
1575 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1576 return -ERESTARTSYS;
1577
1578 /* check the capture file */
1579 if (gspca_dev->capt_file != file) {
1580 ret = -EBUSY;
1581 goto out;
1582 }
1583
1584 if (gspca_dev->nframes == 0
1585 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1586 ret = -EINVAL;
1587 goto out;
1588 }
1589 if (!gspca_dev->streaming) {
1590 ret = gspca_init_transfer(gspca_dev);
1591 if (ret < 0)
1592 goto out;
1593 }
1594 #ifdef GSPCA_DEBUG
1595 if (gspca_debug & D_STREAM) {
1596 PDEBUG_MODE("stream on OK",
1597 gspca_dev->pixfmt,
1598 gspca_dev->width,
1599 gspca_dev->height);
1600 }
1601 #endif
1602 ret = 0;
1603 out:
1604 mutex_unlock(&gspca_dev->queue_lock);
1605 return ret;
1606 }
1607
1608 static int vidioc_streamoff(struct file *file, void *priv,
1609 enum v4l2_buf_type buf_type)
1610 {
1611 struct gspca_dev *gspca_dev = priv;
1612 int ret;
1613
1614 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1615 return -EINVAL;
1616
1617 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1618 return -ERESTARTSYS;
1619
1620 if (!gspca_dev->streaming) {
1621 ret = 0;
1622 goto out;
1623 }
1624
1625 /* check the capture file */
1626 if (gspca_dev->capt_file != file) {
1627 ret = -EBUSY;
1628 goto out;
1629 }
1630
1631 /* stop streaming */
1632 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1633 ret = -ERESTARTSYS;
1634 goto out;
1635 }
1636 gspca_dev->usb_err = 0;
1637 gspca_stream_off(gspca_dev);
1638 mutex_unlock(&gspca_dev->usb_lock);
1639 /* In case another thread is waiting in dqbuf */
1640 wake_up_interruptible(&gspca_dev->wq);
1641
1642 /* empty the transfer queues */
1643 atomic_set(&gspca_dev->fr_q, 0);
1644 atomic_set(&gspca_dev->fr_i, 0);
1645 gspca_dev->fr_o = 0;
1646 ret = 0;
1647 out:
1648 mutex_unlock(&gspca_dev->queue_lock);
1649 return ret;
1650 }
1651
1652 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1653 struct v4l2_jpegcompression *jpegcomp)
1654 {
1655 struct gspca_dev *gspca_dev = priv;
1656 int ret;
1657
1658 if (!gspca_dev->sd_desc->get_jcomp)
1659 return -EINVAL;
1660 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1661 return -ERESTARTSYS;
1662 gspca_dev->usb_err = 0;
1663 if (gspca_dev->present)
1664 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1665 else
1666 ret = -ENODEV;
1667 mutex_unlock(&gspca_dev->usb_lock);
1668 return ret;
1669 }
1670
1671 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1672 struct v4l2_jpegcompression *jpegcomp)
1673 {
1674 struct gspca_dev *gspca_dev = priv;
1675 int ret;
1676
1677 if (!gspca_dev->sd_desc->set_jcomp)
1678 return -EINVAL;
1679 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1680 return -ERESTARTSYS;
1681 gspca_dev->usb_err = 0;
1682 if (gspca_dev->present)
1683 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1684 else
1685 ret = -ENODEV;
1686 mutex_unlock(&gspca_dev->usb_lock);
1687 return ret;
1688 }
1689
1690 static int vidioc_g_parm(struct file *filp, void *priv,
1691 struct v4l2_streamparm *parm)
1692 {
1693 struct gspca_dev *gspca_dev = priv;
1694
1695 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1696
1697 if (gspca_dev->sd_desc->get_streamparm) {
1698 int ret;
1699
1700 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1701 return -ERESTARTSYS;
1702 if (gspca_dev->present) {
1703 gspca_dev->usb_err = 0;
1704 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1705 ret = gspca_dev->usb_err;
1706 } else {
1707 ret = -ENODEV;
1708 }
1709 mutex_unlock(&gspca_dev->usb_lock);
1710 return ret;
1711 }
1712
1713 return 0;
1714 }
1715
1716 static int vidioc_s_parm(struct file *filp, void *priv,
1717 struct v4l2_streamparm *parm)
1718 {
1719 struct gspca_dev *gspca_dev = priv;
1720 int n;
1721
1722 n = parm->parm.capture.readbuffers;
1723 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1724 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1725 else
1726 gspca_dev->nbufread = n;
1727
1728 if (gspca_dev->sd_desc->set_streamparm) {
1729 int ret;
1730
1731 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1732 return -ERESTARTSYS;
1733 if (gspca_dev->present) {
1734 gspca_dev->usb_err = 0;
1735 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1736 ret = gspca_dev->usb_err;
1737 } else {
1738 ret = -ENODEV;
1739 }
1740 mutex_unlock(&gspca_dev->usb_lock);
1741 return ret;
1742 }
1743
1744 return 0;
1745 }
1746
1747 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1748 {
1749 struct gspca_dev *gspca_dev = file->private_data;
1750 struct gspca_frame *frame;
1751 struct page *page;
1752 unsigned long addr, start, size;
1753 int i, ret;
1754
1755 start = vma->vm_start;
1756 size = vma->vm_end - vma->vm_start;
1757 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1758
1759 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1760 return -ERESTARTSYS;
1761 if (!gspca_dev->present) {
1762 ret = -ENODEV;
1763 goto out;
1764 }
1765 if (gspca_dev->capt_file != file) {
1766 ret = -EINVAL;
1767 goto out;
1768 }
1769
1770 frame = NULL;
1771 for (i = 0; i < gspca_dev->nframes; ++i) {
1772 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1773 PDEBUG(D_STREAM, "mmap bad memory type");
1774 break;
1775 }
1776 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1777 == vma->vm_pgoff) {
1778 frame = &gspca_dev->frame[i];
1779 break;
1780 }
1781 }
1782 if (frame == NULL) {
1783 PDEBUG(D_STREAM, "mmap no frame buffer found");
1784 ret = -EINVAL;
1785 goto out;
1786 }
1787 if (size != frame->v4l2_buf.length) {
1788 PDEBUG(D_STREAM, "mmap bad size");
1789 ret = -EINVAL;
1790 goto out;
1791 }
1792
1793 /*
1794 * - VM_IO marks the area as being a mmaped region for I/O to a
1795 * device. It also prevents the region from being core dumped.
1796 */
1797 vma->vm_flags |= VM_IO;
1798
1799 addr = (unsigned long) frame->data;
1800 while (size > 0) {
1801 page = vmalloc_to_page((void *) addr);
1802 ret = vm_insert_page(vma, start, page);
1803 if (ret < 0)
1804 goto out;
1805 start += PAGE_SIZE;
1806 addr += PAGE_SIZE;
1807 size -= PAGE_SIZE;
1808 }
1809
1810 vma->vm_ops = &gspca_vm_ops;
1811 vma->vm_private_data = frame;
1812 gspca_vm_open(vma);
1813 ret = 0;
1814 out:
1815 mutex_unlock(&gspca_dev->queue_lock);
1816 return ret;
1817 }
1818
1819 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1820 enum v4l2_memory memory)
1821 {
1822 if (!gspca_dev->present)
1823 return -ENODEV;
1824 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1825 !gspca_dev->streaming)
1826 return -EINVAL;
1827
1828 /* check if a frame is ready */
1829 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1830 }
1831
1832 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1833 enum v4l2_memory memory)
1834 {
1835 int ret;
1836
1837 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1838 return -ERESTARTSYS;
1839 ret = frame_ready_nolock(gspca_dev, file, memory);
1840 mutex_unlock(&gspca_dev->queue_lock);
1841 return ret;
1842 }
1843
1844 /*
1845 * dequeue a video buffer
1846 *
1847 * If nonblock_ing is false, block until a buffer is available.
1848 */
1849 static int vidioc_dqbuf(struct file *file, void *priv,
1850 struct v4l2_buffer *v4l2_buf)
1851 {
1852 struct gspca_dev *gspca_dev = priv;
1853 struct gspca_frame *frame;
1854 int i, j, ret;
1855
1856 PDEBUG(D_FRAM, "dqbuf");
1857
1858 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1859 return -ERESTARTSYS;
1860
1861 for (;;) {
1862 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1863 if (ret < 0)
1864 goto out;
1865 if (ret > 0)
1866 break;
1867
1868 mutex_unlock(&gspca_dev->queue_lock);
1869
1870 if (file->f_flags & O_NONBLOCK)
1871 return -EAGAIN;
1872
1873 /* wait till a frame is ready */
1874 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1875 frame_ready(gspca_dev, file, v4l2_buf->memory),
1876 msecs_to_jiffies(3000));
1877 if (ret < 0)
1878 return ret;
1879 if (ret == 0)
1880 return -EIO;
1881
1882 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1883 return -ERESTARTSYS;
1884 }
1885
1886 i = gspca_dev->fr_o;
1887 j = gspca_dev->fr_queue[i];
1888 frame = &gspca_dev->frame[j];
1889
1890 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1891
1892 if (gspca_dev->sd_desc->dq_callback) {
1893 mutex_lock(&gspca_dev->usb_lock);
1894 gspca_dev->usb_err = 0;
1895 if (gspca_dev->present)
1896 gspca_dev->sd_desc->dq_callback(gspca_dev);
1897 mutex_unlock(&gspca_dev->usb_lock);
1898 }
1899
1900 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1901 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1902 PDEBUG(D_FRAM, "dqbuf %d", j);
1903 ret = 0;
1904
1905 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1906 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1907 frame->data,
1908 frame->v4l2_buf.bytesused)) {
1909 PDEBUG(D_ERR|D_STREAM,
1910 "dqbuf cp to user failed");
1911 ret = -EFAULT;
1912 }
1913 }
1914 out:
1915 mutex_unlock(&gspca_dev->queue_lock);
1916 return ret;
1917 }
1918
1919 /*
1920 * queue a video buffer
1921 *
1922 * Attempting to queue a buffer that has already been
1923 * queued will return -EINVAL.
1924 */
1925 static int vidioc_qbuf(struct file *file, void *priv,
1926 struct v4l2_buffer *v4l2_buf)
1927 {
1928 struct gspca_dev *gspca_dev = priv;
1929 struct gspca_frame *frame;
1930 int i, index, ret;
1931
1932 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1933
1934 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1935 return -ERESTARTSYS;
1936
1937 index = v4l2_buf->index;
1938 if ((unsigned) index >= gspca_dev->nframes) {
1939 PDEBUG(D_FRAM,
1940 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1941 ret = -EINVAL;
1942 goto out;
1943 }
1944 if (v4l2_buf->memory != gspca_dev->memory) {
1945 PDEBUG(D_FRAM, "qbuf bad memory type");
1946 ret = -EINVAL;
1947 goto out;
1948 }
1949
1950 frame = &gspca_dev->frame[index];
1951 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1952 PDEBUG(D_FRAM, "qbuf bad state");
1953 ret = -EINVAL;
1954 goto out;
1955 }
1956
1957 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1958
1959 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1960 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1961 frame->v4l2_buf.length = v4l2_buf->length;
1962 }
1963
1964 /* put the buffer in the 'queued' queue */
1965 i = atomic_read(&gspca_dev->fr_q);
1966 gspca_dev->fr_queue[i] = index;
1967 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1968
1969 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1970 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1971 ret = 0;
1972 out:
1973 mutex_unlock(&gspca_dev->queue_lock);
1974 return ret;
1975 }
1976
1977 /*
1978 * allocate the resources for read()
1979 */
1980 static int read_alloc(struct gspca_dev *gspca_dev,
1981 struct file *file)
1982 {
1983 struct v4l2_buffer v4l2_buf;
1984 int i, ret;
1985
1986 PDEBUG(D_STREAM, "read alloc");
1987 if (gspca_dev->nframes == 0) {
1988 struct v4l2_requestbuffers rb;
1989
1990 memset(&rb, 0, sizeof rb);
1991 rb.count = gspca_dev->nbufread;
1992 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1993 rb.memory = GSPCA_MEMORY_READ;
1994 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1995 if (ret != 0) {
1996 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1997 return ret;
1998 }
1999 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2000 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2001 v4l2_buf.memory = GSPCA_MEMORY_READ;
2002 for (i = 0; i < gspca_dev->nbufread; i++) {
2003 v4l2_buf.index = i;
2004 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2005 if (ret != 0) {
2006 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2007 return ret;
2008 }
2009 }
2010 gspca_dev->memory = GSPCA_MEMORY_READ;
2011 }
2012
2013 /* start streaming */
2014 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2015 if (ret != 0)
2016 PDEBUG(D_STREAM, "read streamon err %d", ret);
2017 return ret;
2018 }
2019
2020 static unsigned int dev_poll(struct file *file, poll_table *wait)
2021 {
2022 struct gspca_dev *gspca_dev = file->private_data;
2023 int ret;
2024
2025 PDEBUG(D_FRAM, "poll");
2026
2027 poll_wait(file, &gspca_dev->wq, wait);
2028
2029 /* if reqbufs is not done, the user would use read() */
2030 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2031 ret = read_alloc(gspca_dev, file);
2032 if (ret != 0)
2033 return POLLERR;
2034 }
2035
2036 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2037 return POLLERR;
2038
2039 /* check if an image has been received */
2040 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2041 ret = POLLIN | POLLRDNORM; /* yes */
2042 else
2043 ret = 0;
2044 mutex_unlock(&gspca_dev->queue_lock);
2045 if (!gspca_dev->present)
2046 return POLLHUP;
2047 return ret;
2048 }
2049
2050 static ssize_t dev_read(struct file *file, char __user *data,
2051 size_t count, loff_t *ppos)
2052 {
2053 struct gspca_dev *gspca_dev = file->private_data;
2054 struct gspca_frame *frame;
2055 struct v4l2_buffer v4l2_buf;
2056 struct timeval timestamp;
2057 int n, ret, ret2;
2058
2059 PDEBUG(D_FRAM, "read (%zd)", count);
2060 if (!gspca_dev->present)
2061 return -ENODEV;
2062 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2063 ret = read_alloc(gspca_dev, file);
2064 if (ret != 0)
2065 return ret;
2066 }
2067
2068 /* get a frame */
2069 timestamp = ktime_to_timeval(ktime_get());
2070 timestamp.tv_sec--;
2071 n = 2;
2072 for (;;) {
2073 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2074 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2075 v4l2_buf.memory = GSPCA_MEMORY_READ;
2076 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2077 if (ret != 0) {
2078 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2079 return ret;
2080 }
2081
2082 /* if the process slept for more than 1 second,
2083 * get a newer frame */
2084 frame = &gspca_dev->frame[v4l2_buf.index];
2085 if (--n < 0)
2086 break; /* avoid infinite loop */
2087 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2088 break;
2089 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2090 if (ret != 0) {
2091 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2092 return ret;
2093 }
2094 }
2095
2096 /* copy the frame */
2097 if (count > frame->v4l2_buf.bytesused)
2098 count = frame->v4l2_buf.bytesused;
2099 ret = copy_to_user(data, frame->data, count);
2100 if (ret != 0) {
2101 PDEBUG(D_ERR|D_STREAM,
2102 "read cp to user lack %d / %zd", ret, count);
2103 ret = -EFAULT;
2104 goto out;
2105 }
2106 ret = count;
2107 out:
2108 /* in each case, requeue the buffer */
2109 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2110 if (ret2 != 0)
2111 return ret2;
2112 return ret;
2113 }
2114
2115 static struct v4l2_file_operations dev_fops = {
2116 .owner = THIS_MODULE,
2117 .open = dev_open,
2118 .release = dev_close,
2119 .read = dev_read,
2120 .mmap = dev_mmap,
2121 .unlocked_ioctl = video_ioctl2,
2122 .poll = dev_poll,
2123 };
2124
2125 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2126 .vidioc_querycap = vidioc_querycap,
2127 .vidioc_dqbuf = vidioc_dqbuf,
2128 .vidioc_qbuf = vidioc_qbuf,
2129 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2130 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2131 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2132 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2133 .vidioc_streamon = vidioc_streamon,
2134 .vidioc_queryctrl = vidioc_queryctrl,
2135 .vidioc_g_ctrl = vidioc_g_ctrl,
2136 .vidioc_s_ctrl = vidioc_s_ctrl,
2137 .vidioc_querymenu = vidioc_querymenu,
2138 .vidioc_enum_input = vidioc_enum_input,
2139 .vidioc_g_input = vidioc_g_input,
2140 .vidioc_s_input = vidioc_s_input,
2141 .vidioc_reqbufs = vidioc_reqbufs,
2142 .vidioc_querybuf = vidioc_querybuf,
2143 .vidioc_streamoff = vidioc_streamoff,
2144 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2145 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2146 .vidioc_g_parm = vidioc_g_parm,
2147 .vidioc_s_parm = vidioc_s_parm,
2148 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2149 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2150 #ifdef CONFIG_VIDEO_ADV_DEBUG
2151 .vidioc_g_register = vidioc_g_register,
2152 .vidioc_s_register = vidioc_s_register,
2153 #endif
2154 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2155 };
2156
2157 static const struct video_device gspca_template = {
2158 .name = "gspca main driver",
2159 .fops = &dev_fops,
2160 .ioctl_ops = &dev_ioctl_ops,
2161 .release = gspca_release,
2162 };
2163
2164 /* initialize the controls */
2165 static void ctrls_init(struct gspca_dev *gspca_dev)
2166 {
2167 struct gspca_ctrl *ctrl;
2168 int i;
2169
2170 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2171 i < gspca_dev->sd_desc->nctrls;
2172 i++, ctrl++) {
2173 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2174 ctrl->val = ctrl->def;
2175 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2176 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2177 }
2178 }
2179
2180 /*
2181 * probe and create a new gspca device
2182 *
2183 * This function must be called by the sub-driver when it is
2184 * called for probing a new device.
2185 */
2186 int gspca_dev_probe2(struct usb_interface *intf,
2187 const struct usb_device_id *id,
2188 const struct sd_desc *sd_desc,
2189 int dev_size,
2190 struct module *module)
2191 {
2192 struct gspca_dev *gspca_dev;
2193 struct usb_device *dev = interface_to_usbdev(intf);
2194 int ret;
2195
2196 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2197
2198 /* create the device */
2199 if (dev_size < sizeof *gspca_dev)
2200 dev_size = sizeof *gspca_dev;
2201 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2202 if (!gspca_dev) {
2203 err("couldn't kzalloc gspca struct");
2204 return -ENOMEM;
2205 }
2206 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2207 if (!gspca_dev->usb_buf) {
2208 err("out of memory");
2209 ret = -ENOMEM;
2210 goto out;
2211 }
2212 gspca_dev->dev = dev;
2213 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2214 gspca_dev->nbalt = intf->num_altsetting;
2215
2216 /* check if any audio device */
2217 if (dev->config->desc.bNumInterfaces != 1) {
2218 int i;
2219 struct usb_interface *intf2;
2220
2221 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2222 intf2 = dev->config->interface[i];
2223 if (intf2 != NULL
2224 && intf2->altsetting != NULL
2225 && intf2->altsetting->desc.bInterfaceClass ==
2226 USB_CLASS_AUDIO) {
2227 gspca_dev->audio = 1;
2228 break;
2229 }
2230 }
2231 }
2232
2233 gspca_dev->sd_desc = sd_desc;
2234 gspca_dev->nbufread = 2;
2235 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2236
2237 /* configure the subdriver and initialize the USB device */
2238 ret = sd_desc->config(gspca_dev, id);
2239 if (ret < 0)
2240 goto out;
2241 if (gspca_dev->cam.ctrls != NULL)
2242 ctrls_init(gspca_dev);
2243 ret = sd_desc->init(gspca_dev);
2244 if (ret < 0)
2245 goto out;
2246 gspca_set_default_mode(gspca_dev);
2247
2248 ret = gspca_input_connect(gspca_dev);
2249 if (ret)
2250 goto out;
2251
2252 mutex_init(&gspca_dev->usb_lock);
2253 mutex_init(&gspca_dev->queue_lock);
2254 init_waitqueue_head(&gspca_dev->wq);
2255
2256 /* init video stuff */
2257 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2258 gspca_dev->vdev.parent = &intf->dev;
2259 gspca_dev->module = module;
2260 gspca_dev->present = 1;
2261 ret = video_register_device(&gspca_dev->vdev,
2262 VFL_TYPE_GRABBER,
2263 -1);
2264 if (ret < 0) {
2265 err("video_register_device err %d", ret);
2266 goto out;
2267 }
2268
2269 usb_set_intfdata(intf, gspca_dev);
2270 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2271
2272 gspca_input_create_urb(gspca_dev);
2273
2274 return 0;
2275 out:
2276 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2277 if (gspca_dev->input_dev)
2278 input_unregister_device(gspca_dev->input_dev);
2279 #endif
2280 kfree(gspca_dev->usb_buf);
2281 kfree(gspca_dev);
2282 return ret;
2283 }
2284 EXPORT_SYMBOL(gspca_dev_probe2);
2285
2286 /* same function as the previous one, but check the interface */
2287 int gspca_dev_probe(struct usb_interface *intf,
2288 const struct usb_device_id *id,
2289 const struct sd_desc *sd_desc,
2290 int dev_size,
2291 struct module *module)
2292 {
2293 struct usb_device *dev = interface_to_usbdev(intf);
2294
2295 /* we don't handle multi-config cameras */
2296 if (dev->descriptor.bNumConfigurations != 1) {
2297 err("%04x:%04x too many config",
2298 id->idVendor, id->idProduct);
2299 return -ENODEV;
2300 }
2301
2302 /* the USB video interface must be the first one */
2303 if (dev->config->desc.bNumInterfaces != 1
2304 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2305 return -ENODEV;
2306
2307 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2308 }
2309 EXPORT_SYMBOL(gspca_dev_probe);
2310
2311 /*
2312 * USB disconnection
2313 *
2314 * This function must be called by the sub-driver
2315 * when the device disconnects, after the specific resources are freed.
2316 */
2317 void gspca_disconnect(struct usb_interface *intf)
2318 {
2319 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2320 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2321 struct input_dev *input_dev;
2322 #endif
2323
2324 PDEBUG(D_PROBE, "%s disconnect",
2325 video_device_node_name(&gspca_dev->vdev));
2326 mutex_lock(&gspca_dev->usb_lock);
2327
2328 gspca_dev->present = 0;
2329 wake_up_interruptible(&gspca_dev->wq);
2330
2331 destroy_urbs(gspca_dev);
2332
2333 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2334 gspca_input_destroy_urb(gspca_dev);
2335 input_dev = gspca_dev->input_dev;
2336 if (input_dev) {
2337 gspca_dev->input_dev = NULL;
2338 input_unregister_device(input_dev);
2339 }
2340 #endif
2341
2342 /* the device is freed at exit of this function */
2343 gspca_dev->dev = NULL;
2344 mutex_unlock(&gspca_dev->usb_lock);
2345
2346 usb_set_intfdata(intf, NULL);
2347
2348 /* release the device */
2349 /* (this will call gspca_release() immediatly or on last close) */
2350 video_unregister_device(&gspca_dev->vdev);
2351
2352 /* PDEBUG(D_PROBE, "disconnect complete"); */
2353 }
2354 EXPORT_SYMBOL(gspca_disconnect);
2355
2356 #ifdef CONFIG_PM
2357 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2358 {
2359 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2360
2361 if (!gspca_dev->streaming)
2362 return 0;
2363 gspca_dev->frozen = 1; /* avoid urb error messages */
2364 if (gspca_dev->sd_desc->stopN)
2365 gspca_dev->sd_desc->stopN(gspca_dev);
2366 destroy_urbs(gspca_dev);
2367 gspca_input_destroy_urb(gspca_dev);
2368 gspca_set_alt0(gspca_dev);
2369 if (gspca_dev->sd_desc->stop0)
2370 gspca_dev->sd_desc->stop0(gspca_dev);
2371 return 0;
2372 }
2373 EXPORT_SYMBOL(gspca_suspend);
2374
2375 int gspca_resume(struct usb_interface *intf)
2376 {
2377 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2378
2379 gspca_dev->frozen = 0;
2380 gspca_dev->sd_desc->init(gspca_dev);
2381 gspca_input_create_urb(gspca_dev);
2382 if (gspca_dev->streaming)
2383 return gspca_init_transfer(gspca_dev);
2384 return 0;
2385 }
2386 EXPORT_SYMBOL(gspca_resume);
2387 #endif
2388 /* -- cam driver utility functions -- */
2389
2390 /* auto gain and exposure algorithm based on the knee algorithm described here:
2391 http://ytse.tricolour.net/docs/LowLightOptimization.html
2392
2393 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2394 where changed. */
2395 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2396 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2397 {
2398 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2399 const struct ctrl *gain_ctrl = NULL;
2400 const struct ctrl *exposure_ctrl = NULL;
2401 const struct ctrl *autogain_ctrl = NULL;
2402 int retval = 0;
2403
2404 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2405 if (gspca_dev->ctrl_dis & (1 << i))
2406 continue;
2407 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2408 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2409 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2410 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2411 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2412 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2413 }
2414 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2415 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2416 "on cam without (auto)gain/exposure");
2417 return 0;
2418 }
2419
2420 if (gain_ctrl->get(gspca_dev, &gain) ||
2421 exposure_ctrl->get(gspca_dev, &exposure) ||
2422 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2423 return 0;
2424
2425 orig_gain = gain;
2426 orig_exposure = exposure;
2427
2428 /* If we are of a multiple of deadzone, do multiple steps to reach the
2429 desired lumination fast (with the risc of a slight overshoot) */
2430 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2431
2432 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2433 avg_lum, desired_avg_lum, steps);
2434
2435 for (i = 0; i < steps; i++) {
2436 if (avg_lum > desired_avg_lum) {
2437 if (gain > gain_knee)
2438 gain--;
2439 else if (exposure > exposure_knee)
2440 exposure--;
2441 else if (gain > gain_ctrl->qctrl.default_value)
2442 gain--;
2443 else if (exposure > exposure_ctrl->qctrl.minimum)
2444 exposure--;
2445 else if (gain > gain_ctrl->qctrl.minimum)
2446 gain--;
2447 else
2448 break;
2449 } else {
2450 if (gain < gain_ctrl->qctrl.default_value)
2451 gain++;
2452 else if (exposure < exposure_knee)
2453 exposure++;
2454 else if (gain < gain_knee)
2455 gain++;
2456 else if (exposure < exposure_ctrl->qctrl.maximum)
2457 exposure++;
2458 else if (gain < gain_ctrl->qctrl.maximum)
2459 gain++;
2460 else
2461 break;
2462 }
2463 }
2464
2465 if (gain != orig_gain) {
2466 gain_ctrl->set(gspca_dev, gain);
2467 retval = 1;
2468 }
2469 if (exposure != orig_exposure) {
2470 exposure_ctrl->set(gspca_dev, exposure);
2471 retval = 1;
2472 }
2473
2474 return retval;
2475 }
2476 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2477
2478 /* -- module insert / remove -- */
2479 static int __init gspca_init(void)
2480 {
2481 info("v%d.%d.%d registered",
2482 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2483 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2484 DRIVER_VERSION_NUMBER & 0xff);
2485 return 0;
2486 }
2487 static void __exit gspca_exit(void)
2488 {
2489 }
2490
2491 module_init(gspca_init);
2492 module_exit(gspca_exit);
2493
2494 #ifdef GSPCA_DEBUG
2495 module_param_named(debug, gspca_debug, int, 0644);
2496 MODULE_PARM_DESC(debug,
2497 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2498 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2499 " 0x0100: v4l2");
2500 #endif
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