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Merge branch 'topic/asoc' into for-linus
[mirror_ubuntu-artful-kernel.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, 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 * On LAST_PACKET, a new frame is returned.
418 */
419 void gspca_frame_add(struct gspca_dev *gspca_dev,
420 enum gspca_packet_type packet_type,
421 const u8 *data,
422 int len)
423 {
424 struct gspca_frame *frame;
425 int i, j;
426
427 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
428
429 if (packet_type == FIRST_PACKET) {
430 i = atomic_read(&gspca_dev->fr_i);
431
432 /* if there are no queued buffer, discard the whole frame */
433 if (i == atomic_read(&gspca_dev->fr_q)) {
434 gspca_dev->last_packet_type = DISCARD_PACKET;
435 gspca_dev->sequence++;
436 return;
437 }
438 j = gspca_dev->fr_queue[i];
439 frame = &gspca_dev->frame[j];
440 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
441 frame->v4l2_buf.sequence = gspca_dev->sequence++;
442 gspca_dev->image = frame->data;
443 gspca_dev->image_len = 0;
444 } else {
445 switch (gspca_dev->last_packet_type) {
446 case DISCARD_PACKET:
447 if (packet_type == LAST_PACKET)
448 gspca_dev->last_packet_type = packet_type;
449 return;
450 case LAST_PACKET:
451 return;
452 }
453 }
454
455 /* append the packet to the frame buffer */
456 if (len > 0) {
457 if (gspca_dev->image_len + len > gspca_dev->frsz) {
458 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
459 gspca_dev->image_len + len,
460 gspca_dev->frsz);
461 packet_type = DISCARD_PACKET;
462 } else {
463 /* !! image is NULL only when last pkt is LAST or DISCARD
464 if (gspca_dev->image == NULL) {
465 err("gspca_frame_add() image == NULL");
466 return;
467 }
468 */
469 memcpy(gspca_dev->image + gspca_dev->image_len,
470 data, len);
471 gspca_dev->image_len += len;
472 }
473 }
474 gspca_dev->last_packet_type = packet_type;
475
476 /* if last packet, invalidate packet concatenation until
477 * next first packet, wake up the application and advance
478 * in the queue */
479 if (packet_type == LAST_PACKET) {
480 i = atomic_read(&gspca_dev->fr_i);
481 j = gspca_dev->fr_queue[i];
482 frame = &gspca_dev->frame[j];
483 frame->v4l2_buf.bytesused = gspca_dev->image_len;
484 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
485 | V4L2_BUF_FLAG_DONE)
486 & ~V4L2_BUF_FLAG_QUEUED;
487 i = (i + 1) % GSPCA_MAX_FRAMES;
488 atomic_set(&gspca_dev->fr_i, i);
489 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
490 PDEBUG(D_FRAM, "frame complete len:%d",
491 frame->v4l2_buf.bytesused);
492 gspca_dev->image = NULL;
493 gspca_dev->image_len = 0;
494 }
495 }
496 EXPORT_SYMBOL(gspca_frame_add);
497
498 static int gspca_is_compressed(__u32 format)
499 {
500 switch (format) {
501 case V4L2_PIX_FMT_MJPEG:
502 case V4L2_PIX_FMT_JPEG:
503 case V4L2_PIX_FMT_SPCA561:
504 case V4L2_PIX_FMT_PAC207:
505 case V4L2_PIX_FMT_MR97310A:
506 return 1;
507 }
508 return 0;
509 }
510
511 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
512 enum v4l2_memory memory, unsigned int count)
513 {
514 struct gspca_frame *frame;
515 unsigned int frsz;
516 int i;
517
518 i = gspca_dev->curr_mode;
519 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
520 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
521 frsz = PAGE_ALIGN(frsz);
522 if (count >= GSPCA_MAX_FRAMES)
523 count = GSPCA_MAX_FRAMES - 1;
524 gspca_dev->frbuf = vmalloc_32(frsz * count);
525 if (!gspca_dev->frbuf) {
526 err("frame alloc failed");
527 return -ENOMEM;
528 }
529 gspca_dev->capt_file = file;
530 gspca_dev->memory = memory;
531 gspca_dev->frsz = frsz;
532 gspca_dev->nframes = count;
533 for (i = 0; i < count; i++) {
534 frame = &gspca_dev->frame[i];
535 frame->v4l2_buf.index = i;
536 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
537 frame->v4l2_buf.flags = 0;
538 frame->v4l2_buf.field = V4L2_FIELD_NONE;
539 frame->v4l2_buf.length = frsz;
540 frame->v4l2_buf.memory = memory;
541 frame->v4l2_buf.sequence = 0;
542 frame->data = gspca_dev->frbuf + i * frsz;
543 frame->v4l2_buf.m.offset = i * frsz;
544 }
545 atomic_set(&gspca_dev->fr_q, 0);
546 atomic_set(&gspca_dev->fr_i, 0);
547 gspca_dev->fr_o = 0;
548 return 0;
549 }
550
551 static void frame_free(struct gspca_dev *gspca_dev)
552 {
553 int i;
554
555 PDEBUG(D_STREAM, "frame free");
556 if (gspca_dev->frbuf != NULL) {
557 vfree(gspca_dev->frbuf);
558 gspca_dev->frbuf = NULL;
559 for (i = 0; i < gspca_dev->nframes; i++)
560 gspca_dev->frame[i].data = NULL;
561 }
562 gspca_dev->nframes = 0;
563 gspca_dev->frsz = 0;
564 gspca_dev->capt_file = NULL;
565 gspca_dev->memory = GSPCA_MEMORY_NO;
566 }
567
568 static void destroy_urbs(struct gspca_dev *gspca_dev)
569 {
570 struct urb *urb;
571 unsigned int i;
572
573 PDEBUG(D_STREAM, "kill transfer");
574 for (i = 0; i < MAX_NURBS; i++) {
575 urb = gspca_dev->urb[i];
576 if (urb == NULL)
577 break;
578
579 gspca_dev->urb[i] = NULL;
580 usb_kill_urb(urb);
581 if (urb->transfer_buffer != NULL)
582 usb_free_coherent(gspca_dev->dev,
583 urb->transfer_buffer_length,
584 urb->transfer_buffer,
585 urb->transfer_dma);
586 usb_free_urb(urb);
587 }
588 }
589
590 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
591 {
592 int ret;
593
594 if (gspca_dev->alt == 0)
595 return 0;
596 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
597 if (ret < 0)
598 err("set alt 0 err %d", ret);
599 return ret;
600 }
601
602 /* Note: both the queue and the usb locks should be held when calling this */
603 static void gspca_stream_off(struct gspca_dev *gspca_dev)
604 {
605 gspca_dev->streaming = 0;
606 if (gspca_dev->present) {
607 if (gspca_dev->sd_desc->stopN)
608 gspca_dev->sd_desc->stopN(gspca_dev);
609 destroy_urbs(gspca_dev);
610 gspca_input_destroy_urb(gspca_dev);
611 gspca_set_alt0(gspca_dev);
612 gspca_input_create_urb(gspca_dev);
613 }
614
615 /* always call stop0 to free the subdriver's resources */
616 if (gspca_dev->sd_desc->stop0)
617 gspca_dev->sd_desc->stop0(gspca_dev);
618 PDEBUG(D_STREAM, "stream off OK");
619 }
620
621 /*
622 * look for an input transfer endpoint in an alternate setting
623 */
624 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
625 int xfer)
626 {
627 struct usb_host_endpoint *ep;
628 int i, attr;
629
630 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
631 ep = &alt->endpoint[i];
632 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
633 if (attr == xfer
634 && ep->desc.wMaxPacketSize != 0)
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 to mmap mode */
1530 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1531 streaming = 0;
1532
1533 /* free the previous allocated buffers, if any */
1534 if (gspca_dev->nframes != 0)
1535 frame_free(gspca_dev);
1536 if (rb->count == 0) /* unrequest */
1537 goto out;
1538 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1539 if (ret == 0) {
1540 rb->count = gspca_dev->nframes;
1541 if (streaming)
1542 ret = gspca_init_transfer(gspca_dev);
1543 }
1544 out:
1545 mutex_unlock(&gspca_dev->queue_lock);
1546 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1547 return ret;
1548 }
1549
1550 static int vidioc_querybuf(struct file *file, void *priv,
1551 struct v4l2_buffer *v4l2_buf)
1552 {
1553 struct gspca_dev *gspca_dev = priv;
1554 struct gspca_frame *frame;
1555
1556 if (v4l2_buf->index < 0
1557 || v4l2_buf->index >= gspca_dev->nframes)
1558 return -EINVAL;
1559
1560 frame = &gspca_dev->frame[v4l2_buf->index];
1561 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1562 return 0;
1563 }
1564
1565 static int vidioc_streamon(struct file *file, void *priv,
1566 enum v4l2_buf_type buf_type)
1567 {
1568 struct gspca_dev *gspca_dev = priv;
1569 int ret;
1570
1571 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1572 return -EINVAL;
1573 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1574 return -ERESTARTSYS;
1575
1576 /* check the capture file */
1577 if (gspca_dev->capt_file != file) {
1578 ret = -EBUSY;
1579 goto out;
1580 }
1581
1582 if (gspca_dev->nframes == 0
1583 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1584 ret = -EINVAL;
1585 goto out;
1586 }
1587 if (!gspca_dev->streaming) {
1588 ret = gspca_init_transfer(gspca_dev);
1589 if (ret < 0)
1590 goto out;
1591 }
1592 #ifdef GSPCA_DEBUG
1593 if (gspca_debug & D_STREAM) {
1594 PDEBUG_MODE("stream on OK",
1595 gspca_dev->pixfmt,
1596 gspca_dev->width,
1597 gspca_dev->height);
1598 }
1599 #endif
1600 ret = 0;
1601 out:
1602 mutex_unlock(&gspca_dev->queue_lock);
1603 return ret;
1604 }
1605
1606 static int vidioc_streamoff(struct file *file, void *priv,
1607 enum v4l2_buf_type buf_type)
1608 {
1609 struct gspca_dev *gspca_dev = priv;
1610 int ret;
1611
1612 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1613 return -EINVAL;
1614
1615 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1616 return -ERESTARTSYS;
1617
1618 if (!gspca_dev->streaming) {
1619 ret = 0;
1620 goto out;
1621 }
1622
1623 /* check the capture file */
1624 if (gspca_dev->capt_file != file) {
1625 ret = -EBUSY;
1626 goto out;
1627 }
1628
1629 /* stop streaming */
1630 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1631 ret = -ERESTARTSYS;
1632 goto out;
1633 }
1634 gspca_dev->usb_err = 0;
1635 gspca_stream_off(gspca_dev);
1636 mutex_unlock(&gspca_dev->usb_lock);
1637 /* In case another thread is waiting in dqbuf */
1638 wake_up_interruptible(&gspca_dev->wq);
1639
1640 /* empty the transfer queues */
1641 atomic_set(&gspca_dev->fr_q, 0);
1642 atomic_set(&gspca_dev->fr_i, 0);
1643 gspca_dev->fr_o = 0;
1644 ret = 0;
1645 out:
1646 mutex_unlock(&gspca_dev->queue_lock);
1647 return ret;
1648 }
1649
1650 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1651 struct v4l2_jpegcompression *jpegcomp)
1652 {
1653 struct gspca_dev *gspca_dev = priv;
1654 int ret;
1655
1656 if (!gspca_dev->sd_desc->get_jcomp)
1657 return -EINVAL;
1658 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1659 return -ERESTARTSYS;
1660 gspca_dev->usb_err = 0;
1661 if (gspca_dev->present)
1662 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1663 else
1664 ret = -ENODEV;
1665 mutex_unlock(&gspca_dev->usb_lock);
1666 return ret;
1667 }
1668
1669 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1670 struct v4l2_jpegcompression *jpegcomp)
1671 {
1672 struct gspca_dev *gspca_dev = priv;
1673 int ret;
1674
1675 if (!gspca_dev->sd_desc->set_jcomp)
1676 return -EINVAL;
1677 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1678 return -ERESTARTSYS;
1679 gspca_dev->usb_err = 0;
1680 if (gspca_dev->present)
1681 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1682 else
1683 ret = -ENODEV;
1684 mutex_unlock(&gspca_dev->usb_lock);
1685 return ret;
1686 }
1687
1688 static int vidioc_g_parm(struct file *filp, void *priv,
1689 struct v4l2_streamparm *parm)
1690 {
1691 struct gspca_dev *gspca_dev = priv;
1692
1693 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1694
1695 if (gspca_dev->sd_desc->get_streamparm) {
1696 int ret;
1697
1698 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1699 return -ERESTARTSYS;
1700 if (gspca_dev->present) {
1701 gspca_dev->usb_err = 0;
1702 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1703 ret = gspca_dev->usb_err;
1704 } else {
1705 ret = -ENODEV;
1706 }
1707 mutex_unlock(&gspca_dev->usb_lock);
1708 return ret;
1709 }
1710
1711 return 0;
1712 }
1713
1714 static int vidioc_s_parm(struct file *filp, void *priv,
1715 struct v4l2_streamparm *parm)
1716 {
1717 struct gspca_dev *gspca_dev = priv;
1718 int n;
1719
1720 n = parm->parm.capture.readbuffers;
1721 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1722 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1723 else
1724 gspca_dev->nbufread = n;
1725
1726 if (gspca_dev->sd_desc->set_streamparm) {
1727 int ret;
1728
1729 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1730 return -ERESTARTSYS;
1731 if (gspca_dev->present) {
1732 gspca_dev->usb_err = 0;
1733 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1734 ret = gspca_dev->usb_err;
1735 } else {
1736 ret = -ENODEV;
1737 }
1738 mutex_unlock(&gspca_dev->usb_lock);
1739 return ret;
1740 }
1741
1742 return 0;
1743 }
1744
1745 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1746 {
1747 struct gspca_dev *gspca_dev = file->private_data;
1748 struct gspca_frame *frame;
1749 struct page *page;
1750 unsigned long addr, start, size;
1751 int i, ret;
1752
1753 start = vma->vm_start;
1754 size = vma->vm_end - vma->vm_start;
1755 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1756
1757 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1758 return -ERESTARTSYS;
1759 if (!gspca_dev->present) {
1760 ret = -ENODEV;
1761 goto out;
1762 }
1763 if (gspca_dev->capt_file != file) {
1764 ret = -EINVAL;
1765 goto out;
1766 }
1767
1768 frame = NULL;
1769 for (i = 0; i < gspca_dev->nframes; ++i) {
1770 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1771 PDEBUG(D_STREAM, "mmap bad memory type");
1772 break;
1773 }
1774 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1775 == vma->vm_pgoff) {
1776 frame = &gspca_dev->frame[i];
1777 break;
1778 }
1779 }
1780 if (frame == NULL) {
1781 PDEBUG(D_STREAM, "mmap no frame buffer found");
1782 ret = -EINVAL;
1783 goto out;
1784 }
1785 if (size != frame->v4l2_buf.length) {
1786 PDEBUG(D_STREAM, "mmap bad size");
1787 ret = -EINVAL;
1788 goto out;
1789 }
1790
1791 /*
1792 * - VM_IO marks the area as being a mmaped region for I/O to a
1793 * device. It also prevents the region from being core dumped.
1794 */
1795 vma->vm_flags |= VM_IO;
1796
1797 addr = (unsigned long) frame->data;
1798 while (size > 0) {
1799 page = vmalloc_to_page((void *) addr);
1800 ret = vm_insert_page(vma, start, page);
1801 if (ret < 0)
1802 goto out;
1803 start += PAGE_SIZE;
1804 addr += PAGE_SIZE;
1805 size -= PAGE_SIZE;
1806 }
1807
1808 vma->vm_ops = &gspca_vm_ops;
1809 vma->vm_private_data = frame;
1810 gspca_vm_open(vma);
1811 ret = 0;
1812 out:
1813 mutex_unlock(&gspca_dev->queue_lock);
1814 return ret;
1815 }
1816
1817 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1818 enum v4l2_memory memory)
1819 {
1820 if (!gspca_dev->present)
1821 return -ENODEV;
1822 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1823 !gspca_dev->streaming)
1824 return -EINVAL;
1825
1826 /* check if a frame is ready */
1827 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1828 }
1829
1830 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1831 enum v4l2_memory memory)
1832 {
1833 int ret;
1834
1835 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1836 return -ERESTARTSYS;
1837 ret = frame_ready_nolock(gspca_dev, file, memory);
1838 mutex_unlock(&gspca_dev->queue_lock);
1839 return ret;
1840 }
1841
1842 /*
1843 * dequeue a video buffer
1844 *
1845 * If nonblock_ing is false, block until a buffer is available.
1846 */
1847 static int vidioc_dqbuf(struct file *file, void *priv,
1848 struct v4l2_buffer *v4l2_buf)
1849 {
1850 struct gspca_dev *gspca_dev = priv;
1851 struct gspca_frame *frame;
1852 int i, j, ret;
1853
1854 PDEBUG(D_FRAM, "dqbuf");
1855
1856 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1857 return -ERESTARTSYS;
1858
1859 for (;;) {
1860 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1861 if (ret < 0)
1862 goto out;
1863 if (ret > 0)
1864 break;
1865
1866 mutex_unlock(&gspca_dev->queue_lock);
1867
1868 if (file->f_flags & O_NONBLOCK)
1869 return -EAGAIN;
1870
1871 /* wait till a frame is ready */
1872 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1873 frame_ready(gspca_dev, file, v4l2_buf->memory),
1874 msecs_to_jiffies(3000));
1875 if (ret < 0)
1876 return ret;
1877 if (ret == 0)
1878 return -EIO;
1879
1880 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1881 return -ERESTARTSYS;
1882 }
1883
1884 i = gspca_dev->fr_o;
1885 j = gspca_dev->fr_queue[i];
1886 frame = &gspca_dev->frame[j];
1887
1888 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1889
1890 if (gspca_dev->sd_desc->dq_callback) {
1891 mutex_lock(&gspca_dev->usb_lock);
1892 gspca_dev->usb_err = 0;
1893 if (gspca_dev->present)
1894 gspca_dev->sd_desc->dq_callback(gspca_dev);
1895 mutex_unlock(&gspca_dev->usb_lock);
1896 }
1897
1898 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1899 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1900 PDEBUG(D_FRAM, "dqbuf %d", j);
1901 ret = 0;
1902
1903 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1904 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1905 frame->data,
1906 frame->v4l2_buf.bytesused)) {
1907 PDEBUG(D_ERR|D_STREAM,
1908 "dqbuf cp to user failed");
1909 ret = -EFAULT;
1910 }
1911 }
1912 out:
1913 mutex_unlock(&gspca_dev->queue_lock);
1914 return ret;
1915 }
1916
1917 /*
1918 * queue a video buffer
1919 *
1920 * Attempting to queue a buffer that has already been
1921 * queued will return -EINVAL.
1922 */
1923 static int vidioc_qbuf(struct file *file, void *priv,
1924 struct v4l2_buffer *v4l2_buf)
1925 {
1926 struct gspca_dev *gspca_dev = priv;
1927 struct gspca_frame *frame;
1928 int i, index, ret;
1929
1930 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1931
1932 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1933 return -ERESTARTSYS;
1934
1935 index = v4l2_buf->index;
1936 if ((unsigned) index >= gspca_dev->nframes) {
1937 PDEBUG(D_FRAM,
1938 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1939 ret = -EINVAL;
1940 goto out;
1941 }
1942 if (v4l2_buf->memory != gspca_dev->memory) {
1943 PDEBUG(D_FRAM, "qbuf bad memory type");
1944 ret = -EINVAL;
1945 goto out;
1946 }
1947
1948 frame = &gspca_dev->frame[index];
1949 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1950 PDEBUG(D_FRAM, "qbuf bad state");
1951 ret = -EINVAL;
1952 goto out;
1953 }
1954
1955 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1956
1957 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1958 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1959 frame->v4l2_buf.length = v4l2_buf->length;
1960 }
1961
1962 /* put the buffer in the 'queued' queue */
1963 i = atomic_read(&gspca_dev->fr_q);
1964 gspca_dev->fr_queue[i] = index;
1965 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1966
1967 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1968 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1969 ret = 0;
1970 out:
1971 mutex_unlock(&gspca_dev->queue_lock);
1972 return ret;
1973 }
1974
1975 /*
1976 * allocate the resources for read()
1977 */
1978 static int read_alloc(struct gspca_dev *gspca_dev,
1979 struct file *file)
1980 {
1981 struct v4l2_buffer v4l2_buf;
1982 int i, ret;
1983
1984 PDEBUG(D_STREAM, "read alloc");
1985 if (gspca_dev->nframes == 0) {
1986 struct v4l2_requestbuffers rb;
1987
1988 memset(&rb, 0, sizeof rb);
1989 rb.count = gspca_dev->nbufread;
1990 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1991 rb.memory = GSPCA_MEMORY_READ;
1992 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1993 if (ret != 0) {
1994 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1995 return ret;
1996 }
1997 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1998 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1999 v4l2_buf.memory = GSPCA_MEMORY_READ;
2000 for (i = 0; i < gspca_dev->nbufread; i++) {
2001 v4l2_buf.index = i;
2002 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2003 if (ret != 0) {
2004 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2005 return ret;
2006 }
2007 }
2008 gspca_dev->memory = GSPCA_MEMORY_READ;
2009 }
2010
2011 /* start streaming */
2012 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2013 if (ret != 0)
2014 PDEBUG(D_STREAM, "read streamon err %d", ret);
2015 return ret;
2016 }
2017
2018 static unsigned int dev_poll(struct file *file, poll_table *wait)
2019 {
2020 struct gspca_dev *gspca_dev = file->private_data;
2021 int ret;
2022
2023 PDEBUG(D_FRAM, "poll");
2024
2025 poll_wait(file, &gspca_dev->wq, wait);
2026
2027 /* if reqbufs is not done, the user would use read() */
2028 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2029 ret = read_alloc(gspca_dev, file);
2030 if (ret != 0)
2031 return POLLERR;
2032 }
2033
2034 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2035 return POLLERR;
2036
2037 /* check if an image has been received */
2038 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2039 ret = POLLIN | POLLRDNORM; /* yes */
2040 else
2041 ret = 0;
2042 mutex_unlock(&gspca_dev->queue_lock);
2043 if (!gspca_dev->present)
2044 return POLLHUP;
2045 return ret;
2046 }
2047
2048 static ssize_t dev_read(struct file *file, char __user *data,
2049 size_t count, loff_t *ppos)
2050 {
2051 struct gspca_dev *gspca_dev = file->private_data;
2052 struct gspca_frame *frame;
2053 struct v4l2_buffer v4l2_buf;
2054 struct timeval timestamp;
2055 int n, ret, ret2;
2056
2057 PDEBUG(D_FRAM, "read (%zd)", count);
2058 if (!gspca_dev->present)
2059 return -ENODEV;
2060 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2061 ret = read_alloc(gspca_dev, file);
2062 if (ret != 0)
2063 return ret;
2064 }
2065
2066 /* get a frame */
2067 timestamp = ktime_to_timeval(ktime_get());
2068 timestamp.tv_sec--;
2069 n = 2;
2070 for (;;) {
2071 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2072 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2073 v4l2_buf.memory = GSPCA_MEMORY_READ;
2074 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2075 if (ret != 0) {
2076 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2077 return ret;
2078 }
2079
2080 /* if the process slept for more than 1 second,
2081 * get a newer frame */
2082 frame = &gspca_dev->frame[v4l2_buf.index];
2083 if (--n < 0)
2084 break; /* avoid infinite loop */
2085 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2086 break;
2087 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2088 if (ret != 0) {
2089 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2090 return ret;
2091 }
2092 }
2093
2094 /* copy the frame */
2095 if (count > frame->v4l2_buf.bytesused)
2096 count = frame->v4l2_buf.bytesused;
2097 ret = copy_to_user(data, frame->data, count);
2098 if (ret != 0) {
2099 PDEBUG(D_ERR|D_STREAM,
2100 "read cp to user lack %d / %zd", ret, count);
2101 ret = -EFAULT;
2102 goto out;
2103 }
2104 ret = count;
2105 out:
2106 /* in each case, requeue the buffer */
2107 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2108 if (ret2 != 0)
2109 return ret2;
2110 return ret;
2111 }
2112
2113 static struct v4l2_file_operations dev_fops = {
2114 .owner = THIS_MODULE,
2115 .open = dev_open,
2116 .release = dev_close,
2117 .read = dev_read,
2118 .mmap = dev_mmap,
2119 .unlocked_ioctl = video_ioctl2,
2120 .poll = dev_poll,
2121 };
2122
2123 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2124 .vidioc_querycap = vidioc_querycap,
2125 .vidioc_dqbuf = vidioc_dqbuf,
2126 .vidioc_qbuf = vidioc_qbuf,
2127 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2128 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2129 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2130 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2131 .vidioc_streamon = vidioc_streamon,
2132 .vidioc_queryctrl = vidioc_queryctrl,
2133 .vidioc_g_ctrl = vidioc_g_ctrl,
2134 .vidioc_s_ctrl = vidioc_s_ctrl,
2135 .vidioc_querymenu = vidioc_querymenu,
2136 .vidioc_enum_input = vidioc_enum_input,
2137 .vidioc_g_input = vidioc_g_input,
2138 .vidioc_s_input = vidioc_s_input,
2139 .vidioc_reqbufs = vidioc_reqbufs,
2140 .vidioc_querybuf = vidioc_querybuf,
2141 .vidioc_streamoff = vidioc_streamoff,
2142 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2143 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2144 .vidioc_g_parm = vidioc_g_parm,
2145 .vidioc_s_parm = vidioc_s_parm,
2146 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2147 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2148 #ifdef CONFIG_VIDEO_ADV_DEBUG
2149 .vidioc_g_register = vidioc_g_register,
2150 .vidioc_s_register = vidioc_s_register,
2151 #endif
2152 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2153 };
2154
2155 static struct video_device gspca_template = {
2156 .name = "gspca main driver",
2157 .fops = &dev_fops,
2158 .ioctl_ops = &dev_ioctl_ops,
2159 .release = gspca_release,
2160 };
2161
2162 /* initialize the controls */
2163 static void ctrls_init(struct gspca_dev *gspca_dev)
2164 {
2165 struct gspca_ctrl *ctrl;
2166 int i;
2167
2168 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2169 i < gspca_dev->sd_desc->nctrls;
2170 i++, ctrl++) {
2171 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2172 ctrl->val = ctrl->def;
2173 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2174 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2175 }
2176 }
2177
2178 /*
2179 * probe and create a new gspca device
2180 *
2181 * This function must be called by the sub-driver when it is
2182 * called for probing a new device.
2183 */
2184 int gspca_dev_probe2(struct usb_interface *intf,
2185 const struct usb_device_id *id,
2186 const struct sd_desc *sd_desc,
2187 int dev_size,
2188 struct module *module)
2189 {
2190 struct gspca_dev *gspca_dev;
2191 struct usb_device *dev = interface_to_usbdev(intf);
2192 int ret;
2193
2194 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2195
2196 /* create the device */
2197 if (dev_size < sizeof *gspca_dev)
2198 dev_size = sizeof *gspca_dev;
2199 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2200 if (!gspca_dev) {
2201 err("couldn't kzalloc gspca struct");
2202 return -ENOMEM;
2203 }
2204 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2205 if (!gspca_dev->usb_buf) {
2206 err("out of memory");
2207 ret = -ENOMEM;
2208 goto out;
2209 }
2210 gspca_dev->dev = dev;
2211 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2212 gspca_dev->nbalt = intf->num_altsetting;
2213
2214 /* check if any audio device */
2215 if (dev->config->desc.bNumInterfaces != 1) {
2216 int i;
2217 struct usb_interface *intf2;
2218
2219 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2220 intf2 = dev->config->interface[i];
2221 if (intf2 != NULL
2222 && intf2->altsetting != NULL
2223 && intf2->altsetting->desc.bInterfaceClass ==
2224 USB_CLASS_AUDIO) {
2225 gspca_dev->audio = 1;
2226 break;
2227 }
2228 }
2229 }
2230
2231 gspca_dev->sd_desc = sd_desc;
2232 gspca_dev->nbufread = 2;
2233 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2234
2235 /* configure the subdriver and initialize the USB device */
2236 ret = sd_desc->config(gspca_dev, id);
2237 if (ret < 0)
2238 goto out;
2239 if (gspca_dev->cam.ctrls != NULL)
2240 ctrls_init(gspca_dev);
2241 ret = sd_desc->init(gspca_dev);
2242 if (ret < 0)
2243 goto out;
2244 gspca_set_default_mode(gspca_dev);
2245
2246 ret = gspca_input_connect(gspca_dev);
2247 if (ret)
2248 goto out;
2249
2250 mutex_init(&gspca_dev->usb_lock);
2251 mutex_init(&gspca_dev->queue_lock);
2252 init_waitqueue_head(&gspca_dev->wq);
2253
2254 /* init video stuff */
2255 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2256 gspca_dev->vdev.parent = &intf->dev;
2257 gspca_dev->module = module;
2258 gspca_dev->present = 1;
2259 ret = video_register_device(&gspca_dev->vdev,
2260 VFL_TYPE_GRABBER,
2261 -1);
2262 if (ret < 0) {
2263 err("video_register_device err %d", ret);
2264 goto out;
2265 }
2266
2267 usb_set_intfdata(intf, gspca_dev);
2268 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2269
2270 gspca_input_create_urb(gspca_dev);
2271
2272 return 0;
2273 out:
2274 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2275 if (gspca_dev->input_dev)
2276 input_unregister_device(gspca_dev->input_dev);
2277 #endif
2278 kfree(gspca_dev->usb_buf);
2279 kfree(gspca_dev);
2280 return ret;
2281 }
2282 EXPORT_SYMBOL(gspca_dev_probe2);
2283
2284 /* same function as the previous one, but check the interface */
2285 int gspca_dev_probe(struct usb_interface *intf,
2286 const struct usb_device_id *id,
2287 const struct sd_desc *sd_desc,
2288 int dev_size,
2289 struct module *module)
2290 {
2291 struct usb_device *dev = interface_to_usbdev(intf);
2292
2293 /* we don't handle multi-config cameras */
2294 if (dev->descriptor.bNumConfigurations != 1) {
2295 err("%04x:%04x too many config",
2296 id->idVendor, id->idProduct);
2297 return -ENODEV;
2298 }
2299
2300 /* the USB video interface must be the first one */
2301 if (dev->config->desc.bNumInterfaces != 1
2302 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2303 return -ENODEV;
2304
2305 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2306 }
2307 EXPORT_SYMBOL(gspca_dev_probe);
2308
2309 /*
2310 * USB disconnection
2311 *
2312 * This function must be called by the sub-driver
2313 * when the device disconnects, after the specific resources are freed.
2314 */
2315 void gspca_disconnect(struct usb_interface *intf)
2316 {
2317 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2318 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2319 struct input_dev *input_dev;
2320 #endif
2321
2322 PDEBUG(D_PROBE, "%s disconnect",
2323 video_device_node_name(&gspca_dev->vdev));
2324 mutex_lock(&gspca_dev->usb_lock);
2325
2326 gspca_dev->present = 0;
2327 wake_up_interruptible(&gspca_dev->wq);
2328
2329 destroy_urbs(gspca_dev);
2330
2331 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2332 gspca_input_destroy_urb(gspca_dev);
2333 input_dev = gspca_dev->input_dev;
2334 if (input_dev) {
2335 gspca_dev->input_dev = NULL;
2336 input_unregister_device(input_dev);
2337 }
2338 #endif
2339
2340 /* the device is freed at exit of this function */
2341 gspca_dev->dev = NULL;
2342 mutex_unlock(&gspca_dev->usb_lock);
2343
2344 usb_set_intfdata(intf, NULL);
2345
2346 /* release the device */
2347 /* (this will call gspca_release() immediatly or on last close) */
2348 video_unregister_device(&gspca_dev->vdev);
2349
2350 /* PDEBUG(D_PROBE, "disconnect complete"); */
2351 }
2352 EXPORT_SYMBOL(gspca_disconnect);
2353
2354 #ifdef CONFIG_PM
2355 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2356 {
2357 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2358
2359 if (!gspca_dev->streaming)
2360 return 0;
2361 gspca_dev->frozen = 1; /* avoid urb error messages */
2362 if (gspca_dev->sd_desc->stopN)
2363 gspca_dev->sd_desc->stopN(gspca_dev);
2364 destroy_urbs(gspca_dev);
2365 gspca_input_destroy_urb(gspca_dev);
2366 gspca_set_alt0(gspca_dev);
2367 if (gspca_dev->sd_desc->stop0)
2368 gspca_dev->sd_desc->stop0(gspca_dev);
2369 return 0;
2370 }
2371 EXPORT_SYMBOL(gspca_suspend);
2372
2373 int gspca_resume(struct usb_interface *intf)
2374 {
2375 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2376
2377 gspca_dev->frozen = 0;
2378 gspca_dev->sd_desc->init(gspca_dev);
2379 gspca_input_create_urb(gspca_dev);
2380 if (gspca_dev->streaming)
2381 return gspca_init_transfer(gspca_dev);
2382 return 0;
2383 }
2384 EXPORT_SYMBOL(gspca_resume);
2385 #endif
2386 /* -- cam driver utility functions -- */
2387
2388 /* auto gain and exposure algorithm based on the knee algorithm described here:
2389 http://ytse.tricolour.net/docs/LowLightOptimization.html
2390
2391 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2392 where changed. */
2393 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2394 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2395 {
2396 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2397 const struct ctrl *gain_ctrl = NULL;
2398 const struct ctrl *exposure_ctrl = NULL;
2399 const struct ctrl *autogain_ctrl = NULL;
2400 int retval = 0;
2401
2402 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2403 if (gspca_dev->ctrl_dis & (1 << i))
2404 continue;
2405 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2406 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2407 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2408 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2409 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2410 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2411 }
2412 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2413 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2414 "on cam without (auto)gain/exposure");
2415 return 0;
2416 }
2417
2418 if (gain_ctrl->get(gspca_dev, &gain) ||
2419 exposure_ctrl->get(gspca_dev, &exposure) ||
2420 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2421 return 0;
2422
2423 orig_gain = gain;
2424 orig_exposure = exposure;
2425
2426 /* If we are of a multiple of deadzone, do multiple steps to reach the
2427 desired lumination fast (with the risc of a slight overshoot) */
2428 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2429
2430 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2431 avg_lum, desired_avg_lum, steps);
2432
2433 for (i = 0; i < steps; i++) {
2434 if (avg_lum > desired_avg_lum) {
2435 if (gain > gain_knee)
2436 gain--;
2437 else if (exposure > exposure_knee)
2438 exposure--;
2439 else if (gain > gain_ctrl->qctrl.default_value)
2440 gain--;
2441 else if (exposure > exposure_ctrl->qctrl.minimum)
2442 exposure--;
2443 else if (gain > gain_ctrl->qctrl.minimum)
2444 gain--;
2445 else
2446 break;
2447 } else {
2448 if (gain < gain_ctrl->qctrl.default_value)
2449 gain++;
2450 else if (exposure < exposure_knee)
2451 exposure++;
2452 else if (gain < gain_knee)
2453 gain++;
2454 else if (exposure < exposure_ctrl->qctrl.maximum)
2455 exposure++;
2456 else if (gain < gain_ctrl->qctrl.maximum)
2457 gain++;
2458 else
2459 break;
2460 }
2461 }
2462
2463 if (gain != orig_gain) {
2464 gain_ctrl->set(gspca_dev, gain);
2465 retval = 1;
2466 }
2467 if (exposure != orig_exposure) {
2468 exposure_ctrl->set(gspca_dev, exposure);
2469 retval = 1;
2470 }
2471
2472 return retval;
2473 }
2474 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2475
2476 /* -- module insert / remove -- */
2477 static int __init gspca_init(void)
2478 {
2479 info("v%d.%d.%d registered",
2480 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2481 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2482 DRIVER_VERSION_NUMBER & 0xff);
2483 return 0;
2484 }
2485 static void __exit gspca_exit(void)
2486 {
2487 }
2488
2489 module_init(gspca_init);
2490 module_exit(gspca_exit);
2491
2492 #ifdef GSPCA_DEBUG
2493 module_param_named(debug, gspca_debug, int, 0644);
2494 MODULE_PARM_DESC(debug,
2495 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2496 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2497 " 0x0100: v4l2");
2498 #endif
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