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[deliverable/linux.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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26 #define GSPCA_VERSION "2.14.0"
27
28 #include <linux/init.h>
29 #include <linux/fs.h>
30 #include <linux/vmalloc.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/string.h>
35 #include <linux/pagemap.h>
36 #include <linux/io.h>
37 #include <asm/page.h>
38 #include <linux/uaccess.h>
39 #include <linux/ktime.h>
40 #include <media/v4l2-ioctl.h>
41
42 #include "gspca.h"
43
44 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
45 #include <linux/input.h>
46 #include <linux/usb/input.h>
47 #endif
48
49 /* global values */
50 #define DEF_NURBS 3 /* default number of URBs */
51 #if DEF_NURBS > MAX_NURBS
52 #error "DEF_NURBS too big"
53 #endif
54
55 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
56 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
57 MODULE_LICENSE("GPL");
58 MODULE_VERSION(GSPCA_VERSION);
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 pr_err("Resubmit URB failed with error %i\n", 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 pr_err("Input device registration failed with error %i\n",
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 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
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 pr_err("usb_submit_urb() ret %d\n", 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 pr_err("usb_submit_urb() ret %d\n", 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 gspca_dev->image = NULL;
449 gspca_dev->image_len = 0;
450 }
451 return;
452 case LAST_PACKET:
453 return;
454 }
455 }
456
457 /* append the packet to the frame buffer */
458 if (len > 0) {
459 if (gspca_dev->image_len + len > gspca_dev->frsz) {
460 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
461 gspca_dev->image_len + len,
462 gspca_dev->frsz);
463 packet_type = DISCARD_PACKET;
464 } else {
465 /* !! image is NULL only when last pkt is LAST or DISCARD
466 if (gspca_dev->image == NULL) {
467 pr_err("gspca_frame_add() image == NULL\n");
468 return;
469 }
470 */
471 memcpy(gspca_dev->image + gspca_dev->image_len,
472 data, len);
473 gspca_dev->image_len += len;
474 }
475 }
476 gspca_dev->last_packet_type = packet_type;
477
478 /* if last packet, invalidate packet concatenation until
479 * next first packet, wake up the application and advance
480 * in the queue */
481 if (packet_type == LAST_PACKET) {
482 i = atomic_read(&gspca_dev->fr_i);
483 j = gspca_dev->fr_queue[i];
484 frame = &gspca_dev->frame[j];
485 frame->v4l2_buf.bytesused = gspca_dev->image_len;
486 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
487 | V4L2_BUF_FLAG_DONE)
488 & ~V4L2_BUF_FLAG_QUEUED;
489 i = (i + 1) % GSPCA_MAX_FRAMES;
490 atomic_set(&gspca_dev->fr_i, i);
491 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
492 PDEBUG(D_FRAM, "frame complete len:%d",
493 frame->v4l2_buf.bytesused);
494 gspca_dev->image = NULL;
495 gspca_dev->image_len = 0;
496 }
497 }
498 EXPORT_SYMBOL(gspca_frame_add);
499
500 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
501 enum v4l2_memory memory, unsigned int count)
502 {
503 struct gspca_frame *frame;
504 unsigned int frsz;
505 int i;
506
507 i = gspca_dev->curr_mode;
508 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
509 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
510 frsz = PAGE_ALIGN(frsz);
511 if (count >= GSPCA_MAX_FRAMES)
512 count = GSPCA_MAX_FRAMES - 1;
513 gspca_dev->frbuf = vmalloc_32(frsz * count);
514 if (!gspca_dev->frbuf) {
515 pr_err("frame alloc failed\n");
516 return -ENOMEM;
517 }
518 gspca_dev->capt_file = file;
519 gspca_dev->memory = memory;
520 gspca_dev->frsz = frsz;
521 gspca_dev->nframes = count;
522 for (i = 0; i < count; i++) {
523 frame = &gspca_dev->frame[i];
524 frame->v4l2_buf.index = i;
525 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
526 frame->v4l2_buf.flags = 0;
527 frame->v4l2_buf.field = V4L2_FIELD_NONE;
528 frame->v4l2_buf.length = frsz;
529 frame->v4l2_buf.memory = memory;
530 frame->v4l2_buf.sequence = 0;
531 frame->data = gspca_dev->frbuf + i * frsz;
532 frame->v4l2_buf.m.offset = i * frsz;
533 }
534 atomic_set(&gspca_dev->fr_q, 0);
535 atomic_set(&gspca_dev->fr_i, 0);
536 gspca_dev->fr_o = 0;
537 return 0;
538 }
539
540 static void frame_free(struct gspca_dev *gspca_dev)
541 {
542 int i;
543
544 PDEBUG(D_STREAM, "frame free");
545 if (gspca_dev->frbuf != NULL) {
546 vfree(gspca_dev->frbuf);
547 gspca_dev->frbuf = NULL;
548 for (i = 0; i < gspca_dev->nframes; i++)
549 gspca_dev->frame[i].data = NULL;
550 }
551 gspca_dev->nframes = 0;
552 gspca_dev->frsz = 0;
553 gspca_dev->capt_file = NULL;
554 gspca_dev->memory = GSPCA_MEMORY_NO;
555 }
556
557 static void destroy_urbs(struct gspca_dev *gspca_dev)
558 {
559 struct urb *urb;
560 unsigned int i;
561
562 PDEBUG(D_STREAM, "kill transfer");
563 for (i = 0; i < MAX_NURBS; i++) {
564 urb = gspca_dev->urb[i];
565 if (urb == NULL)
566 break;
567
568 gspca_dev->urb[i] = NULL;
569 usb_kill_urb(urb);
570 if (urb->transfer_buffer != NULL)
571 usb_free_coherent(gspca_dev->dev,
572 urb->transfer_buffer_length,
573 urb->transfer_buffer,
574 urb->transfer_dma);
575 usb_free_urb(urb);
576 }
577 }
578
579 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
580 {
581 int ret;
582
583 if (gspca_dev->alt == 0)
584 return 0;
585 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
586 if (ret < 0)
587 pr_err("set alt 0 err %d\n", ret);
588 return ret;
589 }
590
591 /* Note: both the queue and the usb locks should be held when calling this */
592 static void gspca_stream_off(struct gspca_dev *gspca_dev)
593 {
594 gspca_dev->streaming = 0;
595 if (gspca_dev->present) {
596 if (gspca_dev->sd_desc->stopN)
597 gspca_dev->sd_desc->stopN(gspca_dev);
598 destroy_urbs(gspca_dev);
599 gspca_input_destroy_urb(gspca_dev);
600 gspca_set_alt0(gspca_dev);
601 gspca_input_create_urb(gspca_dev);
602 }
603
604 /* always call stop0 to free the subdriver's resources */
605 if (gspca_dev->sd_desc->stop0)
606 gspca_dev->sd_desc->stop0(gspca_dev);
607 PDEBUG(D_STREAM, "stream off OK");
608 }
609
610 /*
611 * look for an input transfer endpoint in an alternate setting
612 */
613 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
614 int xfer)
615 {
616 struct usb_host_endpoint *ep;
617 int i, attr;
618
619 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
620 ep = &alt->endpoint[i];
621 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
622 if (attr == xfer
623 && ep->desc.wMaxPacketSize != 0
624 && usb_endpoint_dir_in(&ep->desc))
625 return ep;
626 }
627 return NULL;
628 }
629
630 /* compute the minimum bandwidth for the current transfer */
631 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
632 {
633 u32 bandwidth;
634 int i;
635
636 i = gspca_dev->curr_mode;
637 bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
638
639 /* if the image is compressed, estimate the mean image size */
640 if (bandwidth < gspca_dev->cam.cam_mode[i].width *
641 gspca_dev->cam.cam_mode[i].height)
642 bandwidth /= 3;
643
644 /* estimate the frame rate */
645 if (gspca_dev->sd_desc->get_streamparm) {
646 struct v4l2_streamparm parm;
647
648 parm.parm.capture.timeperframe.denominator = 15;
649 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
650 bandwidth *= parm.parm.capture.timeperframe.denominator;
651 } else {
652 bandwidth *= 15; /* 15 fps */
653 }
654
655 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
656 return bandwidth;
657 }
658
659 /* endpoint table */
660 #define MAX_ALT 16
661 struct ep_tb_s {
662 u32 alt;
663 u32 bandwidth;
664 };
665
666 /*
667 * build the table of the endpoints
668 * and compute the minimum bandwidth for the image transfer
669 */
670 static int build_ep_tb(struct gspca_dev *gspca_dev,
671 struct usb_interface *intf,
672 int xfer,
673 struct ep_tb_s *ep_tb)
674 {
675 struct usb_host_endpoint *ep;
676 int i, j, nbalt, psize, found;
677 u32 bandwidth, last_bw;
678
679 nbalt = intf->num_altsetting;
680 if (nbalt > MAX_ALT)
681 nbalt = MAX_ALT; /* fixme: should warn */
682
683 /* build the endpoint table */
684 i = 0;
685 last_bw = 0;
686 for (;;) {
687 ep_tb->bandwidth = 2000 * 2000 * 120;
688 found = 0;
689 for (j = 0; j < nbalt; j++) {
690 ep = alt_xfer(&intf->altsetting[j], xfer);
691 if (ep == NULL)
692 continue;
693 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
694 if (!gspca_dev->cam.bulk) /* isoc */
695 psize = (psize & 0x07ff) *
696 (1 + ((psize >> 11) & 3));
697 bandwidth = psize * ep->desc.bInterval * 1000;
698 if (gspca_dev->dev->speed == USB_SPEED_HIGH
699 || gspca_dev->dev->speed == USB_SPEED_SUPER)
700 bandwidth *= 8;
701 if (bandwidth <= last_bw)
702 continue;
703 if (bandwidth < ep_tb->bandwidth) {
704 ep_tb->bandwidth = bandwidth;
705 ep_tb->alt = j;
706 found = 1;
707 }
708 }
709 if (!found)
710 break;
711 PDEBUG(D_STREAM, "alt %d bandwidth %d",
712 ep_tb->alt, ep_tb->bandwidth);
713 last_bw = ep_tb->bandwidth;
714 i++;
715 ep_tb++;
716 }
717
718 /* get the requested bandwidth and start at the highest atlsetting */
719 bandwidth = which_bandwidth(gspca_dev);
720 ep_tb--;
721 while (i > 1) {
722 ep_tb--;
723 if (ep_tb->bandwidth < bandwidth)
724 break;
725 i--;
726 }
727 return i;
728 }
729
730 /*
731 * create the URBs for image transfer
732 */
733 static int create_urbs(struct gspca_dev *gspca_dev,
734 struct usb_host_endpoint *ep)
735 {
736 struct urb *urb;
737 int n, nurbs, i, psize, npkt, bsize;
738
739 /* calculate the packet size and the number of packets */
740 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
741
742 if (!gspca_dev->cam.bulk) { /* isoc */
743
744 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
745 if (gspca_dev->pkt_size == 0)
746 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
747 else
748 psize = gspca_dev->pkt_size;
749 npkt = gspca_dev->cam.npkt;
750 if (npkt == 0)
751 npkt = 32; /* default value */
752 bsize = psize * npkt;
753 PDEBUG(D_STREAM,
754 "isoc %d pkts size %d = bsize:%d",
755 npkt, psize, bsize);
756 nurbs = DEF_NURBS;
757 } else { /* bulk */
758 npkt = 0;
759 bsize = gspca_dev->cam.bulk_size;
760 if (bsize == 0)
761 bsize = psize;
762 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
763 if (gspca_dev->cam.bulk_nurbs != 0)
764 nurbs = gspca_dev->cam.bulk_nurbs;
765 else
766 nurbs = 1;
767 }
768
769 for (n = 0; n < nurbs; n++) {
770 urb = usb_alloc_urb(npkt, GFP_KERNEL);
771 if (!urb) {
772 pr_err("usb_alloc_urb failed\n");
773 return -ENOMEM;
774 }
775 gspca_dev->urb[n] = urb;
776 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
777 bsize,
778 GFP_KERNEL,
779 &urb->transfer_dma);
780
781 if (urb->transfer_buffer == NULL) {
782 pr_err("usb_alloc_coherent failed\n");
783 return -ENOMEM;
784 }
785 urb->dev = gspca_dev->dev;
786 urb->context = gspca_dev;
787 urb->transfer_buffer_length = bsize;
788 if (npkt != 0) { /* ISOC */
789 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
790 ep->desc.bEndpointAddress);
791 urb->transfer_flags = URB_ISO_ASAP
792 | URB_NO_TRANSFER_DMA_MAP;
793 if (gspca_dev->dev->speed == USB_SPEED_LOW)
794 urb->interval = ep->desc.bInterval;
795 else
796 urb->interval = 1 << (ep->desc.bInterval - 1);
797 urb->complete = isoc_irq;
798 urb->number_of_packets = npkt;
799 for (i = 0; i < npkt; i++) {
800 urb->iso_frame_desc[i].length = psize;
801 urb->iso_frame_desc[i].offset = psize * i;
802 }
803 } else { /* bulk */
804 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
805 ep->desc.bEndpointAddress);
806 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
807 urb->complete = bulk_irq;
808 }
809 }
810 return 0;
811 }
812
813 /*
814 * start the USB transfer
815 */
816 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
817 {
818 struct usb_interface *intf;
819 struct usb_host_endpoint *ep;
820 struct urb *urb;
821 struct ep_tb_s ep_tb[MAX_ALT];
822 int n, ret, xfer, alt, alt_idx;
823
824 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
825 return -ERESTARTSYS;
826
827 if (!gspca_dev->present) {
828 ret = -ENODEV;
829 goto unlock;
830 }
831
832 /* reset the streaming variables */
833 gspca_dev->image = NULL;
834 gspca_dev->image_len = 0;
835 gspca_dev->last_packet_type = DISCARD_PACKET;
836 gspca_dev->sequence = 0;
837
838 gspca_dev->usb_err = 0;
839
840 /* do the specific subdriver stuff before endpoint selection */
841 gspca_dev->alt = 0;
842 if (gspca_dev->sd_desc->isoc_init) {
843 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
844 if (ret < 0)
845 goto unlock;
846 }
847 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
848 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
849 : USB_ENDPOINT_XFER_ISOC;
850
851 /* if the subdriver forced an altsetting, get the endpoint */
852 if (gspca_dev->alt != 0) {
853 gspca_dev->alt--; /* (previous version compatibility) */
854 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
855 if (ep == NULL) {
856 pr_err("bad altsetting %d\n", gspca_dev->alt);
857 ret = -EIO;
858 goto out;
859 }
860 ep_tb[0].alt = gspca_dev->alt;
861 alt_idx = 1;
862 } else {
863
864 /* else, compute the minimum bandwidth
865 * and build the endpoint table */
866 alt_idx = build_ep_tb(gspca_dev, intf, xfer, ep_tb);
867 if (alt_idx <= 0) {
868 pr_err("no transfer endpoint found\n");
869 ret = -EIO;
870 goto unlock;
871 }
872 }
873
874 /* set the highest alternate setting and
875 * loop until urb submit succeeds */
876 gspca_input_destroy_urb(gspca_dev);
877
878 gspca_dev->alt = ep_tb[--alt_idx].alt;
879 alt = -1;
880 for (;;) {
881 if (alt != gspca_dev->alt) {
882 alt = gspca_dev->alt;
883 if (gspca_dev->nbalt > 1) {
884 ret = usb_set_interface(gspca_dev->dev,
885 gspca_dev->iface,
886 alt);
887 if (ret < 0) {
888 if (ret == -ENOSPC)
889 goto retry; /*fixme: ugly*/
890 pr_err("set alt %d err %d\n", alt, ret);
891 goto out;
892 }
893 }
894 }
895 if (!gspca_dev->cam.no_urb_create) {
896 PDEBUG(D_STREAM, "init transfer alt %d", alt);
897 ret = create_urbs(gspca_dev,
898 alt_xfer(&intf->altsetting[alt], xfer));
899 if (ret < 0) {
900 destroy_urbs(gspca_dev);
901 goto out;
902 }
903 }
904
905 /* clear the bulk endpoint */
906 if (gspca_dev->cam.bulk)
907 usb_clear_halt(gspca_dev->dev,
908 gspca_dev->urb[0]->pipe);
909
910 /* start the cam */
911 ret = gspca_dev->sd_desc->start(gspca_dev);
912 if (ret < 0) {
913 destroy_urbs(gspca_dev);
914 goto out;
915 }
916 gspca_dev->streaming = 1;
917
918 /* some bulk transfers are started by the subdriver */
919 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
920 break;
921
922 /* submit the URBs */
923 for (n = 0; n < MAX_NURBS; n++) {
924 urb = gspca_dev->urb[n];
925 if (urb == NULL)
926 break;
927 ret = usb_submit_urb(urb, GFP_KERNEL);
928 if (ret < 0)
929 break;
930 }
931 if (ret >= 0)
932 break; /* transfer is started */
933
934 /* something when wrong
935 * stop the webcam and free the transfer resources */
936 gspca_stream_off(gspca_dev);
937 if (ret != -ENOSPC) {
938 pr_err("usb_submit_urb alt %d err %d\n",
939 gspca_dev->alt, ret);
940 goto out;
941 }
942
943 /* the bandwidth is not wide enough
944 * negotiate or try a lower alternate setting */
945 retry:
946 PDEBUG(D_ERR|D_STREAM,
947 "alt %d - bandwidth not wide enough - trying again",
948 alt);
949 msleep(20); /* wait for kill complete */
950 if (gspca_dev->sd_desc->isoc_nego) {
951 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
952 if (ret < 0)
953 goto out;
954 } else {
955 if (alt_idx <= 0) {
956 pr_err("no transfer endpoint found\n");
957 ret = -EIO;
958 goto out;
959 }
960 alt = ep_tb[--alt_idx].alt;
961 }
962 }
963 out:
964 gspca_input_create_urb(gspca_dev);
965 unlock:
966 mutex_unlock(&gspca_dev->usb_lock);
967 return ret;
968 }
969
970 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
971 {
972 struct gspca_ctrl *ctrl;
973 int i;
974
975 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
976 gspca_dev->curr_mode = i;
977 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
978 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
979 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
980
981 /* set the current control values to their default values
982 * which may have changed in sd_init() */
983 ctrl = gspca_dev->cam.ctrls;
984 if (ctrl != NULL) {
985 for (i = 0;
986 i < gspca_dev->sd_desc->nctrls;
987 i++, ctrl++)
988 ctrl->val = ctrl->def;
989 }
990 }
991
992 static int wxh_to_mode(struct gspca_dev *gspca_dev,
993 int width, int height)
994 {
995 int i;
996
997 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
998 if (width >= gspca_dev->cam.cam_mode[i].width
999 && height >= gspca_dev->cam.cam_mode[i].height)
1000 break;
1001 }
1002 return i;
1003 }
1004
1005 /*
1006 * search a mode with the right pixel format
1007 */
1008 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1009 int mode,
1010 int pixfmt)
1011 {
1012 int modeU, modeD;
1013
1014 modeU = modeD = mode;
1015 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1016 if (--modeD >= 0) {
1017 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1018 == pixfmt)
1019 return modeD;
1020 }
1021 if (++modeU < gspca_dev->cam.nmodes) {
1022 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1023 == pixfmt)
1024 return modeU;
1025 }
1026 }
1027 return -EINVAL;
1028 }
1029
1030 #ifdef CONFIG_VIDEO_ADV_DEBUG
1031 static int vidioc_g_register(struct file *file, void *priv,
1032 struct v4l2_dbg_register *reg)
1033 {
1034 int ret;
1035 struct gspca_dev *gspca_dev = priv;
1036
1037 if (!gspca_dev->sd_desc->get_chip_ident)
1038 return -EINVAL;
1039
1040 if (!gspca_dev->sd_desc->get_register)
1041 return -EINVAL;
1042
1043 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1044 return -ERESTARTSYS;
1045 gspca_dev->usb_err = 0;
1046 if (gspca_dev->present)
1047 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
1048 else
1049 ret = -ENODEV;
1050 mutex_unlock(&gspca_dev->usb_lock);
1051
1052 return ret;
1053 }
1054
1055 static int vidioc_s_register(struct file *file, void *priv,
1056 struct v4l2_dbg_register *reg)
1057 {
1058 int ret;
1059 struct gspca_dev *gspca_dev = priv;
1060
1061 if (!gspca_dev->sd_desc->get_chip_ident)
1062 return -EINVAL;
1063
1064 if (!gspca_dev->sd_desc->set_register)
1065 return -EINVAL;
1066
1067 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1068 return -ERESTARTSYS;
1069 gspca_dev->usb_err = 0;
1070 if (gspca_dev->present)
1071 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
1072 else
1073 ret = -ENODEV;
1074 mutex_unlock(&gspca_dev->usb_lock);
1075
1076 return ret;
1077 }
1078 #endif
1079
1080 static int vidioc_g_chip_ident(struct file *file, void *priv,
1081 struct v4l2_dbg_chip_ident *chip)
1082 {
1083 int ret;
1084 struct gspca_dev *gspca_dev = priv;
1085
1086 if (!gspca_dev->sd_desc->get_chip_ident)
1087 return -EINVAL;
1088
1089 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1090 return -ERESTARTSYS;
1091 gspca_dev->usb_err = 0;
1092 if (gspca_dev->present)
1093 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1094 else
1095 ret = -ENODEV;
1096 mutex_unlock(&gspca_dev->usb_lock);
1097
1098 return ret;
1099 }
1100
1101 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1102 struct v4l2_fmtdesc *fmtdesc)
1103 {
1104 struct gspca_dev *gspca_dev = priv;
1105 int i, j, index;
1106 __u32 fmt_tb[8];
1107
1108 /* give an index to each format */
1109 index = 0;
1110 j = 0;
1111 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1112 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1113 j = 0;
1114 for (;;) {
1115 if (fmt_tb[j] == fmt_tb[index])
1116 break;
1117 j++;
1118 }
1119 if (j == index) {
1120 if (fmtdesc->index == index)
1121 break; /* new format */
1122 index++;
1123 if (index >= ARRAY_SIZE(fmt_tb))
1124 return -EINVAL;
1125 }
1126 }
1127 if (i < 0)
1128 return -EINVAL; /* no more format */
1129
1130 fmtdesc->pixelformat = fmt_tb[index];
1131 if (gspca_dev->cam.cam_mode[i].sizeimage <
1132 gspca_dev->cam.cam_mode[i].width *
1133 gspca_dev->cam.cam_mode[i].height)
1134 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1135 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1136 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1137 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1138 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1139 fmtdesc->description[4] = '\0';
1140 return 0;
1141 }
1142
1143 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1144 struct v4l2_format *fmt)
1145 {
1146 struct gspca_dev *gspca_dev = priv;
1147 int mode;
1148
1149 mode = gspca_dev->curr_mode;
1150 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1151 sizeof fmt->fmt.pix);
1152 return 0;
1153 }
1154
1155 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1156 struct v4l2_format *fmt)
1157 {
1158 int w, h, mode, mode2;
1159
1160 w = fmt->fmt.pix.width;
1161 h = fmt->fmt.pix.height;
1162
1163 #ifdef GSPCA_DEBUG
1164 if (gspca_debug & D_CONF)
1165 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1166 #endif
1167 /* search the closest mode for width and height */
1168 mode = wxh_to_mode(gspca_dev, w, h);
1169
1170 /* OK if right palette */
1171 if (gspca_dev->cam.cam_mode[mode].pixelformat
1172 != fmt->fmt.pix.pixelformat) {
1173
1174 /* else, search the closest mode with the same pixel format */
1175 mode2 = gspca_get_mode(gspca_dev, mode,
1176 fmt->fmt.pix.pixelformat);
1177 if (mode2 >= 0)
1178 mode = mode2;
1179 /* else
1180 ; * no chance, return this mode */
1181 }
1182 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1183 sizeof fmt->fmt.pix);
1184 return mode; /* used when s_fmt */
1185 }
1186
1187 static int vidioc_try_fmt_vid_cap(struct file *file,
1188 void *priv,
1189 struct v4l2_format *fmt)
1190 {
1191 struct gspca_dev *gspca_dev = priv;
1192 int ret;
1193
1194 ret = try_fmt_vid_cap(gspca_dev, fmt);
1195 if (ret < 0)
1196 return ret;
1197 return 0;
1198 }
1199
1200 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1201 struct v4l2_format *fmt)
1202 {
1203 struct gspca_dev *gspca_dev = priv;
1204 int ret;
1205
1206 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1207 return -ERESTARTSYS;
1208
1209 ret = try_fmt_vid_cap(gspca_dev, fmt);
1210 if (ret < 0)
1211 goto out;
1212
1213 if (gspca_dev->nframes != 0
1214 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1215 ret = -EINVAL;
1216 goto out;
1217 }
1218
1219 if (ret == gspca_dev->curr_mode) {
1220 ret = 0;
1221 goto out; /* same mode */
1222 }
1223
1224 if (gspca_dev->streaming) {
1225 ret = -EBUSY;
1226 goto out;
1227 }
1228 gspca_dev->width = fmt->fmt.pix.width;
1229 gspca_dev->height = fmt->fmt.pix.height;
1230 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1231 gspca_dev->curr_mode = ret;
1232
1233 ret = 0;
1234 out:
1235 mutex_unlock(&gspca_dev->queue_lock);
1236 return ret;
1237 }
1238
1239 static int vidioc_enum_framesizes(struct file *file, void *priv,
1240 struct v4l2_frmsizeenum *fsize)
1241 {
1242 struct gspca_dev *gspca_dev = priv;
1243 int i;
1244 __u32 index = 0;
1245
1246 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1247 if (fsize->pixel_format !=
1248 gspca_dev->cam.cam_mode[i].pixelformat)
1249 continue;
1250
1251 if (fsize->index == index) {
1252 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1253 fsize->discrete.width =
1254 gspca_dev->cam.cam_mode[i].width;
1255 fsize->discrete.height =
1256 gspca_dev->cam.cam_mode[i].height;
1257 return 0;
1258 }
1259 index++;
1260 }
1261
1262 return -EINVAL;
1263 }
1264
1265 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1266 struct v4l2_frmivalenum *fival)
1267 {
1268 struct gspca_dev *gspca_dev = priv;
1269 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1270 __u32 i;
1271
1272 if (gspca_dev->cam.mode_framerates == NULL ||
1273 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1274 return -EINVAL;
1275
1276 if (fival->pixel_format !=
1277 gspca_dev->cam.cam_mode[mode].pixelformat)
1278 return -EINVAL;
1279
1280 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1281 if (fival->index == i) {
1282 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1283 fival->discrete.numerator = 1;
1284 fival->discrete.denominator =
1285 gspca_dev->cam.mode_framerates[mode].rates[i];
1286 return 0;
1287 }
1288 }
1289
1290 return -EINVAL;
1291 }
1292
1293 static void gspca_release(struct video_device *vfd)
1294 {
1295 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1296
1297 PDEBUG(D_PROBE, "%s released",
1298 video_device_node_name(&gspca_dev->vdev));
1299
1300 kfree(gspca_dev->usb_buf);
1301 kfree(gspca_dev);
1302 }
1303
1304 static int dev_open(struct file *file)
1305 {
1306 struct gspca_dev *gspca_dev;
1307
1308 PDEBUG(D_STREAM, "[%s] open", current->comm);
1309 gspca_dev = (struct gspca_dev *) video_devdata(file);
1310 if (!gspca_dev->present)
1311 return -ENODEV;
1312
1313 /* protect the subdriver against rmmod */
1314 if (!try_module_get(gspca_dev->module))
1315 return -ENODEV;
1316
1317 file->private_data = gspca_dev;
1318 #ifdef GSPCA_DEBUG
1319 /* activate the v4l2 debug */
1320 if (gspca_debug & D_V4L2)
1321 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1322 | V4L2_DEBUG_IOCTL_ARG;
1323 else
1324 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1325 | V4L2_DEBUG_IOCTL_ARG);
1326 #endif
1327 return 0;
1328 }
1329
1330 static int dev_close(struct file *file)
1331 {
1332 struct gspca_dev *gspca_dev = file->private_data;
1333
1334 PDEBUG(D_STREAM, "[%s] close", current->comm);
1335 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1336 return -ERESTARTSYS;
1337
1338 /* if the file did the capture, free the streaming resources */
1339 if (gspca_dev->capt_file == file) {
1340 if (gspca_dev->streaming) {
1341 mutex_lock(&gspca_dev->usb_lock);
1342 gspca_dev->usb_err = 0;
1343 gspca_stream_off(gspca_dev);
1344 mutex_unlock(&gspca_dev->usb_lock);
1345 }
1346 frame_free(gspca_dev);
1347 }
1348 file->private_data = NULL;
1349 module_put(gspca_dev->module);
1350 mutex_unlock(&gspca_dev->queue_lock);
1351
1352 PDEBUG(D_STREAM, "close done");
1353
1354 return 0;
1355 }
1356
1357 static int vidioc_querycap(struct file *file, void *priv,
1358 struct v4l2_capability *cap)
1359 {
1360 struct gspca_dev *gspca_dev = priv;
1361 int ret;
1362
1363 /* protect the access to the usb device */
1364 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1365 return -ERESTARTSYS;
1366 if (!gspca_dev->present) {
1367 ret = -ENODEV;
1368 goto out;
1369 }
1370 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1371 sizeof cap->driver);
1372 if (gspca_dev->dev->product != NULL) {
1373 strlcpy((char *) cap->card, gspca_dev->dev->product,
1374 sizeof cap->card);
1375 } else {
1376 snprintf((char *) cap->card, sizeof cap->card,
1377 "USB Camera (%04x:%04x)",
1378 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1379 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1380 }
1381 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1382 sizeof(cap->bus_info));
1383 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1384 | V4L2_CAP_STREAMING
1385 | V4L2_CAP_READWRITE;
1386 ret = 0;
1387 out:
1388 mutex_unlock(&gspca_dev->usb_lock);
1389 return ret;
1390 }
1391
1392 static int get_ctrl(struct gspca_dev *gspca_dev,
1393 int id)
1394 {
1395 const struct ctrl *ctrls;
1396 int i;
1397
1398 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1399 i < gspca_dev->sd_desc->nctrls;
1400 i++, ctrls++) {
1401 if (gspca_dev->ctrl_dis & (1 << i))
1402 continue;
1403 if (id == ctrls->qctrl.id)
1404 return i;
1405 }
1406 return -1;
1407 }
1408
1409 static int vidioc_queryctrl(struct file *file, void *priv,
1410 struct v4l2_queryctrl *q_ctrl)
1411 {
1412 struct gspca_dev *gspca_dev = priv;
1413 const struct ctrl *ctrls;
1414 struct gspca_ctrl *gspca_ctrl;
1415 int i, idx;
1416 u32 id;
1417
1418 id = q_ctrl->id;
1419 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1420 id &= V4L2_CTRL_ID_MASK;
1421 id++;
1422 idx = -1;
1423 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1424 if (gspca_dev->ctrl_dis & (1 << i))
1425 continue;
1426 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1427 continue;
1428 if (idx >= 0
1429 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1430 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1431 continue;
1432 idx = i;
1433 }
1434 } else {
1435 idx = get_ctrl(gspca_dev, id);
1436 }
1437 if (idx < 0)
1438 return -EINVAL;
1439 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1440 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1441 if (gspca_dev->cam.ctrls != NULL) {
1442 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1443 q_ctrl->default_value = gspca_ctrl->def;
1444 q_ctrl->minimum = gspca_ctrl->min;
1445 q_ctrl->maximum = gspca_ctrl->max;
1446 }
1447 if (gspca_dev->ctrl_inac & (1 << idx))
1448 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1449 return 0;
1450 }
1451
1452 static int vidioc_s_ctrl(struct file *file, void *priv,
1453 struct v4l2_control *ctrl)
1454 {
1455 struct gspca_dev *gspca_dev = priv;
1456 const struct ctrl *ctrls;
1457 struct gspca_ctrl *gspca_ctrl;
1458 int idx, ret;
1459
1460 idx = get_ctrl(gspca_dev, ctrl->id);
1461 if (idx < 0)
1462 return -EINVAL;
1463 if (gspca_dev->ctrl_inac & (1 << idx))
1464 return -EINVAL;
1465 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1466 if (gspca_dev->cam.ctrls != NULL) {
1467 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1468 if (ctrl->value < gspca_ctrl->min
1469 || ctrl->value > gspca_ctrl->max)
1470 return -ERANGE;
1471 } else {
1472 gspca_ctrl = NULL;
1473 if (ctrl->value < ctrls->qctrl.minimum
1474 || ctrl->value > ctrls->qctrl.maximum)
1475 return -ERANGE;
1476 }
1477 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1478 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1479 return -ERESTARTSYS;
1480 if (!gspca_dev->present) {
1481 ret = -ENODEV;
1482 goto out;
1483 }
1484 gspca_dev->usb_err = 0;
1485 if (ctrls->set != NULL) {
1486 ret = ctrls->set(gspca_dev, ctrl->value);
1487 goto out;
1488 }
1489 if (gspca_ctrl != NULL) {
1490 gspca_ctrl->val = ctrl->value;
1491 if (ctrls->set_control != NULL
1492 && gspca_dev->streaming)
1493 ctrls->set_control(gspca_dev);
1494 }
1495 ret = gspca_dev->usb_err;
1496 out:
1497 mutex_unlock(&gspca_dev->usb_lock);
1498 return ret;
1499 }
1500
1501 static int vidioc_g_ctrl(struct file *file, void *priv,
1502 struct v4l2_control *ctrl)
1503 {
1504 struct gspca_dev *gspca_dev = priv;
1505 const struct ctrl *ctrls;
1506 int idx, ret;
1507
1508 idx = get_ctrl(gspca_dev, ctrl->id);
1509 if (idx < 0)
1510 return -EINVAL;
1511 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1512
1513 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1514 return -ERESTARTSYS;
1515 if (!gspca_dev->present) {
1516 ret = -ENODEV;
1517 goto out;
1518 }
1519 gspca_dev->usb_err = 0;
1520 if (ctrls->get != NULL) {
1521 ret = ctrls->get(gspca_dev, &ctrl->value);
1522 goto out;
1523 }
1524 if (gspca_dev->cam.ctrls != NULL)
1525 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1526 ret = 0;
1527 out:
1528 mutex_unlock(&gspca_dev->usb_lock);
1529 return ret;
1530 }
1531
1532 static int vidioc_querymenu(struct file *file, void *priv,
1533 struct v4l2_querymenu *qmenu)
1534 {
1535 struct gspca_dev *gspca_dev = priv;
1536
1537 if (!gspca_dev->sd_desc->querymenu)
1538 return -EINVAL;
1539 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1540 }
1541
1542 static int vidioc_enum_input(struct file *file, void *priv,
1543 struct v4l2_input *input)
1544 {
1545 struct gspca_dev *gspca_dev = priv;
1546
1547 if (input->index != 0)
1548 return -EINVAL;
1549 input->type = V4L2_INPUT_TYPE_CAMERA;
1550 input->status = gspca_dev->cam.input_flags;
1551 strlcpy(input->name, gspca_dev->sd_desc->name,
1552 sizeof input->name);
1553 return 0;
1554 }
1555
1556 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1557 {
1558 *i = 0;
1559 return 0;
1560 }
1561
1562 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1563 {
1564 if (i > 0)
1565 return -EINVAL;
1566 return (0);
1567 }
1568
1569 static int vidioc_reqbufs(struct file *file, void *priv,
1570 struct v4l2_requestbuffers *rb)
1571 {
1572 struct gspca_dev *gspca_dev = priv;
1573 int i, ret = 0, streaming;
1574
1575 i = rb->memory; /* (avoid compilation warning) */
1576 switch (i) {
1577 case GSPCA_MEMORY_READ: /* (internal call) */
1578 case V4L2_MEMORY_MMAP:
1579 case V4L2_MEMORY_USERPTR:
1580 break;
1581 default:
1582 return -EINVAL;
1583 }
1584 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1585 return -ERESTARTSYS;
1586
1587 if (gspca_dev->memory != GSPCA_MEMORY_NO
1588 && gspca_dev->memory != GSPCA_MEMORY_READ
1589 && gspca_dev->memory != rb->memory) {
1590 ret = -EBUSY;
1591 goto out;
1592 }
1593
1594 /* only one file may do the capture */
1595 if (gspca_dev->capt_file != NULL
1596 && gspca_dev->capt_file != file) {
1597 ret = -EBUSY;
1598 goto out;
1599 }
1600
1601 /* if allocated, the buffers must not be mapped */
1602 for (i = 0; i < gspca_dev->nframes; i++) {
1603 if (gspca_dev->frame[i].vma_use_count) {
1604 ret = -EBUSY;
1605 goto out;
1606 }
1607 }
1608
1609 /* stop streaming */
1610 streaming = gspca_dev->streaming;
1611 if (streaming) {
1612 mutex_lock(&gspca_dev->usb_lock);
1613 gspca_dev->usb_err = 0;
1614 gspca_stream_off(gspca_dev);
1615 mutex_unlock(&gspca_dev->usb_lock);
1616
1617 /* Don't restart the stream when switching from read
1618 * to mmap mode */
1619 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1620 streaming = 0;
1621 }
1622
1623 /* free the previous allocated buffers, if any */
1624 if (gspca_dev->nframes != 0)
1625 frame_free(gspca_dev);
1626 if (rb->count == 0) /* unrequest */
1627 goto out;
1628 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1629 if (ret == 0) {
1630 rb->count = gspca_dev->nframes;
1631 if (streaming)
1632 ret = gspca_init_transfer(gspca_dev);
1633 }
1634 out:
1635 mutex_unlock(&gspca_dev->queue_lock);
1636 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1637 return ret;
1638 }
1639
1640 static int vidioc_querybuf(struct file *file, void *priv,
1641 struct v4l2_buffer *v4l2_buf)
1642 {
1643 struct gspca_dev *gspca_dev = priv;
1644 struct gspca_frame *frame;
1645
1646 if (v4l2_buf->index < 0
1647 || v4l2_buf->index >= gspca_dev->nframes)
1648 return -EINVAL;
1649
1650 frame = &gspca_dev->frame[v4l2_buf->index];
1651 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1652 return 0;
1653 }
1654
1655 static int vidioc_streamon(struct file *file, void *priv,
1656 enum v4l2_buf_type buf_type)
1657 {
1658 struct gspca_dev *gspca_dev = priv;
1659 int ret;
1660
1661 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1662 return -EINVAL;
1663 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1664 return -ERESTARTSYS;
1665
1666 /* check the capture file */
1667 if (gspca_dev->capt_file != file) {
1668 ret = -EBUSY;
1669 goto out;
1670 }
1671
1672 if (gspca_dev->nframes == 0
1673 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1674 ret = -EINVAL;
1675 goto out;
1676 }
1677 if (!gspca_dev->streaming) {
1678 ret = gspca_init_transfer(gspca_dev);
1679 if (ret < 0)
1680 goto out;
1681 }
1682 #ifdef GSPCA_DEBUG
1683 if (gspca_debug & D_STREAM) {
1684 PDEBUG_MODE("stream on OK",
1685 gspca_dev->pixfmt,
1686 gspca_dev->width,
1687 gspca_dev->height);
1688 }
1689 #endif
1690 ret = 0;
1691 out:
1692 mutex_unlock(&gspca_dev->queue_lock);
1693 return ret;
1694 }
1695
1696 static int vidioc_streamoff(struct file *file, void *priv,
1697 enum v4l2_buf_type buf_type)
1698 {
1699 struct gspca_dev *gspca_dev = priv;
1700 int ret;
1701
1702 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1703 return -EINVAL;
1704
1705 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1706 return -ERESTARTSYS;
1707
1708 if (!gspca_dev->streaming) {
1709 ret = 0;
1710 goto out;
1711 }
1712
1713 /* check the capture file */
1714 if (gspca_dev->capt_file != file) {
1715 ret = -EBUSY;
1716 goto out;
1717 }
1718
1719 /* stop streaming */
1720 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1721 ret = -ERESTARTSYS;
1722 goto out;
1723 }
1724 gspca_dev->usb_err = 0;
1725 gspca_stream_off(gspca_dev);
1726 mutex_unlock(&gspca_dev->usb_lock);
1727 /* In case another thread is waiting in dqbuf */
1728 wake_up_interruptible(&gspca_dev->wq);
1729
1730 /* empty the transfer queues */
1731 atomic_set(&gspca_dev->fr_q, 0);
1732 atomic_set(&gspca_dev->fr_i, 0);
1733 gspca_dev->fr_o = 0;
1734 ret = 0;
1735 out:
1736 mutex_unlock(&gspca_dev->queue_lock);
1737 return ret;
1738 }
1739
1740 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1741 struct v4l2_jpegcompression *jpegcomp)
1742 {
1743 struct gspca_dev *gspca_dev = priv;
1744 int ret;
1745
1746 if (!gspca_dev->sd_desc->get_jcomp)
1747 return -EINVAL;
1748 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1749 return -ERESTARTSYS;
1750 gspca_dev->usb_err = 0;
1751 if (gspca_dev->present)
1752 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1753 else
1754 ret = -ENODEV;
1755 mutex_unlock(&gspca_dev->usb_lock);
1756 return ret;
1757 }
1758
1759 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1760 struct v4l2_jpegcompression *jpegcomp)
1761 {
1762 struct gspca_dev *gspca_dev = priv;
1763 int ret;
1764
1765 if (!gspca_dev->sd_desc->set_jcomp)
1766 return -EINVAL;
1767 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1768 return -ERESTARTSYS;
1769 gspca_dev->usb_err = 0;
1770 if (gspca_dev->present)
1771 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1772 else
1773 ret = -ENODEV;
1774 mutex_unlock(&gspca_dev->usb_lock);
1775 return ret;
1776 }
1777
1778 static int vidioc_g_parm(struct file *filp, void *priv,
1779 struct v4l2_streamparm *parm)
1780 {
1781 struct gspca_dev *gspca_dev = priv;
1782
1783 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1784
1785 if (gspca_dev->sd_desc->get_streamparm) {
1786 int ret;
1787
1788 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1789 return -ERESTARTSYS;
1790 if (gspca_dev->present) {
1791 gspca_dev->usb_err = 0;
1792 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1793 ret = gspca_dev->usb_err;
1794 } else {
1795 ret = -ENODEV;
1796 }
1797 mutex_unlock(&gspca_dev->usb_lock);
1798 return ret;
1799 }
1800
1801 return 0;
1802 }
1803
1804 static int vidioc_s_parm(struct file *filp, void *priv,
1805 struct v4l2_streamparm *parm)
1806 {
1807 struct gspca_dev *gspca_dev = priv;
1808 int n;
1809
1810 n = parm->parm.capture.readbuffers;
1811 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1812 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1813 else
1814 gspca_dev->nbufread = n;
1815
1816 if (gspca_dev->sd_desc->set_streamparm) {
1817 int ret;
1818
1819 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1820 return -ERESTARTSYS;
1821 if (gspca_dev->present) {
1822 gspca_dev->usb_err = 0;
1823 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1824 ret = gspca_dev->usb_err;
1825 } else {
1826 ret = -ENODEV;
1827 }
1828 mutex_unlock(&gspca_dev->usb_lock);
1829 return ret;
1830 }
1831
1832 return 0;
1833 }
1834
1835 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1836 {
1837 struct gspca_dev *gspca_dev = file->private_data;
1838 struct gspca_frame *frame;
1839 struct page *page;
1840 unsigned long addr, start, size;
1841 int i, ret;
1842
1843 start = vma->vm_start;
1844 size = vma->vm_end - vma->vm_start;
1845 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1846
1847 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1848 return -ERESTARTSYS;
1849 if (!gspca_dev->present) {
1850 ret = -ENODEV;
1851 goto out;
1852 }
1853 if (gspca_dev->capt_file != file) {
1854 ret = -EINVAL;
1855 goto out;
1856 }
1857
1858 frame = NULL;
1859 for (i = 0; i < gspca_dev->nframes; ++i) {
1860 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1861 PDEBUG(D_STREAM, "mmap bad memory type");
1862 break;
1863 }
1864 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1865 == vma->vm_pgoff) {
1866 frame = &gspca_dev->frame[i];
1867 break;
1868 }
1869 }
1870 if (frame == NULL) {
1871 PDEBUG(D_STREAM, "mmap no frame buffer found");
1872 ret = -EINVAL;
1873 goto out;
1874 }
1875 if (size != frame->v4l2_buf.length) {
1876 PDEBUG(D_STREAM, "mmap bad size");
1877 ret = -EINVAL;
1878 goto out;
1879 }
1880
1881 /*
1882 * - VM_IO marks the area as being a mmaped region for I/O to a
1883 * device. It also prevents the region from being core dumped.
1884 */
1885 vma->vm_flags |= VM_IO;
1886
1887 addr = (unsigned long) frame->data;
1888 while (size > 0) {
1889 page = vmalloc_to_page((void *) addr);
1890 ret = vm_insert_page(vma, start, page);
1891 if (ret < 0)
1892 goto out;
1893 start += PAGE_SIZE;
1894 addr += PAGE_SIZE;
1895 size -= PAGE_SIZE;
1896 }
1897
1898 vma->vm_ops = &gspca_vm_ops;
1899 vma->vm_private_data = frame;
1900 gspca_vm_open(vma);
1901 ret = 0;
1902 out:
1903 mutex_unlock(&gspca_dev->queue_lock);
1904 return ret;
1905 }
1906
1907 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1908 enum v4l2_memory memory)
1909 {
1910 if (!gspca_dev->present)
1911 return -ENODEV;
1912 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1913 !gspca_dev->streaming)
1914 return -EINVAL;
1915
1916 /* check if a frame is ready */
1917 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1918 }
1919
1920 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1921 enum v4l2_memory memory)
1922 {
1923 int ret;
1924
1925 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1926 return -ERESTARTSYS;
1927 ret = frame_ready_nolock(gspca_dev, file, memory);
1928 mutex_unlock(&gspca_dev->queue_lock);
1929 return ret;
1930 }
1931
1932 /*
1933 * dequeue a video buffer
1934 *
1935 * If nonblock_ing is false, block until a buffer is available.
1936 */
1937 static int vidioc_dqbuf(struct file *file, void *priv,
1938 struct v4l2_buffer *v4l2_buf)
1939 {
1940 struct gspca_dev *gspca_dev = priv;
1941 struct gspca_frame *frame;
1942 int i, j, ret;
1943
1944 PDEBUG(D_FRAM, "dqbuf");
1945
1946 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1947 return -ERESTARTSYS;
1948
1949 for (;;) {
1950 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1951 if (ret < 0)
1952 goto out;
1953 if (ret > 0)
1954 break;
1955
1956 mutex_unlock(&gspca_dev->queue_lock);
1957
1958 if (file->f_flags & O_NONBLOCK)
1959 return -EAGAIN;
1960
1961 /* wait till a frame is ready */
1962 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1963 frame_ready(gspca_dev, file, v4l2_buf->memory),
1964 msecs_to_jiffies(3000));
1965 if (ret < 0)
1966 return ret;
1967 if (ret == 0)
1968 return -EIO;
1969
1970 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1971 return -ERESTARTSYS;
1972 }
1973
1974 i = gspca_dev->fr_o;
1975 j = gspca_dev->fr_queue[i];
1976 frame = &gspca_dev->frame[j];
1977
1978 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1979
1980 if (gspca_dev->sd_desc->dq_callback) {
1981 mutex_lock(&gspca_dev->usb_lock);
1982 gspca_dev->usb_err = 0;
1983 if (gspca_dev->present)
1984 gspca_dev->sd_desc->dq_callback(gspca_dev);
1985 mutex_unlock(&gspca_dev->usb_lock);
1986 }
1987
1988 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1989 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1990 PDEBUG(D_FRAM, "dqbuf %d", j);
1991 ret = 0;
1992
1993 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1994 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1995 frame->data,
1996 frame->v4l2_buf.bytesused)) {
1997 PDEBUG(D_ERR|D_STREAM,
1998 "dqbuf cp to user failed");
1999 ret = -EFAULT;
2000 }
2001 }
2002 out:
2003 mutex_unlock(&gspca_dev->queue_lock);
2004 return ret;
2005 }
2006
2007 /*
2008 * queue a video buffer
2009 *
2010 * Attempting to queue a buffer that has already been
2011 * queued will return -EINVAL.
2012 */
2013 static int vidioc_qbuf(struct file *file, void *priv,
2014 struct v4l2_buffer *v4l2_buf)
2015 {
2016 struct gspca_dev *gspca_dev = priv;
2017 struct gspca_frame *frame;
2018 int i, index, ret;
2019
2020 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
2021
2022 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
2023 return -ERESTARTSYS;
2024
2025 index = v4l2_buf->index;
2026 if ((unsigned) index >= gspca_dev->nframes) {
2027 PDEBUG(D_FRAM,
2028 "qbuf idx %d >= %d", index, gspca_dev->nframes);
2029 ret = -EINVAL;
2030 goto out;
2031 }
2032 if (v4l2_buf->memory != gspca_dev->memory) {
2033 PDEBUG(D_FRAM, "qbuf bad memory type");
2034 ret = -EINVAL;
2035 goto out;
2036 }
2037
2038 frame = &gspca_dev->frame[index];
2039 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
2040 PDEBUG(D_FRAM, "qbuf bad state");
2041 ret = -EINVAL;
2042 goto out;
2043 }
2044
2045 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
2046
2047 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2048 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2049 frame->v4l2_buf.length = v4l2_buf->length;
2050 }
2051
2052 /* put the buffer in the 'queued' queue */
2053 i = atomic_read(&gspca_dev->fr_q);
2054 gspca_dev->fr_queue[i] = index;
2055 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
2056
2057 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2058 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2059 ret = 0;
2060 out:
2061 mutex_unlock(&gspca_dev->queue_lock);
2062 return ret;
2063 }
2064
2065 /*
2066 * allocate the resources for read()
2067 */
2068 static int read_alloc(struct gspca_dev *gspca_dev,
2069 struct file *file)
2070 {
2071 struct v4l2_buffer v4l2_buf;
2072 int i, ret;
2073
2074 PDEBUG(D_STREAM, "read alloc");
2075 if (gspca_dev->nframes == 0) {
2076 struct v4l2_requestbuffers rb;
2077
2078 memset(&rb, 0, sizeof rb);
2079 rb.count = gspca_dev->nbufread;
2080 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2081 rb.memory = GSPCA_MEMORY_READ;
2082 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2083 if (ret != 0) {
2084 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2085 return ret;
2086 }
2087 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2088 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2089 v4l2_buf.memory = GSPCA_MEMORY_READ;
2090 for (i = 0; i < gspca_dev->nbufread; i++) {
2091 v4l2_buf.index = i;
2092 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2093 if (ret != 0) {
2094 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2095 return ret;
2096 }
2097 }
2098 gspca_dev->memory = GSPCA_MEMORY_READ;
2099 }
2100
2101 /* start streaming */
2102 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2103 if (ret != 0)
2104 PDEBUG(D_STREAM, "read streamon err %d", ret);
2105 return ret;
2106 }
2107
2108 static unsigned int dev_poll(struct file *file, poll_table *wait)
2109 {
2110 struct gspca_dev *gspca_dev = file->private_data;
2111 int ret;
2112
2113 PDEBUG(D_FRAM, "poll");
2114
2115 poll_wait(file, &gspca_dev->wq, wait);
2116
2117 /* if reqbufs is not done, the user would use read() */
2118 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2119 ret = read_alloc(gspca_dev, file);
2120 if (ret != 0)
2121 return POLLERR;
2122 }
2123
2124 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2125 return POLLERR;
2126
2127 /* check if an image has been received */
2128 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2129 ret = POLLIN | POLLRDNORM; /* yes */
2130 else
2131 ret = 0;
2132 mutex_unlock(&gspca_dev->queue_lock);
2133 if (!gspca_dev->present)
2134 return POLLHUP;
2135 return ret;
2136 }
2137
2138 static ssize_t dev_read(struct file *file, char __user *data,
2139 size_t count, loff_t *ppos)
2140 {
2141 struct gspca_dev *gspca_dev = file->private_data;
2142 struct gspca_frame *frame;
2143 struct v4l2_buffer v4l2_buf;
2144 struct timeval timestamp;
2145 int n, ret, ret2;
2146
2147 PDEBUG(D_FRAM, "read (%zd)", count);
2148 if (!gspca_dev->present)
2149 return -ENODEV;
2150 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2151 ret = read_alloc(gspca_dev, file);
2152 if (ret != 0)
2153 return ret;
2154 }
2155
2156 /* get a frame */
2157 timestamp = ktime_to_timeval(ktime_get());
2158 timestamp.tv_sec--;
2159 n = 2;
2160 for (;;) {
2161 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2162 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2163 v4l2_buf.memory = GSPCA_MEMORY_READ;
2164 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2165 if (ret != 0) {
2166 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2167 return ret;
2168 }
2169
2170 /* if the process slept for more than 1 second,
2171 * get a newer frame */
2172 frame = &gspca_dev->frame[v4l2_buf.index];
2173 if (--n < 0)
2174 break; /* avoid infinite loop */
2175 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2176 break;
2177 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2178 if (ret != 0) {
2179 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2180 return ret;
2181 }
2182 }
2183
2184 /* copy the frame */
2185 if (count > frame->v4l2_buf.bytesused)
2186 count = frame->v4l2_buf.bytesused;
2187 ret = copy_to_user(data, frame->data, count);
2188 if (ret != 0) {
2189 PDEBUG(D_ERR|D_STREAM,
2190 "read cp to user lack %d / %zd", ret, count);
2191 ret = -EFAULT;
2192 goto out;
2193 }
2194 ret = count;
2195 out:
2196 /* in each case, requeue the buffer */
2197 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2198 if (ret2 != 0)
2199 return ret2;
2200 return ret;
2201 }
2202
2203 static struct v4l2_file_operations dev_fops = {
2204 .owner = THIS_MODULE,
2205 .open = dev_open,
2206 .release = dev_close,
2207 .read = dev_read,
2208 .mmap = dev_mmap,
2209 .unlocked_ioctl = video_ioctl2,
2210 .poll = dev_poll,
2211 };
2212
2213 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2214 .vidioc_querycap = vidioc_querycap,
2215 .vidioc_dqbuf = vidioc_dqbuf,
2216 .vidioc_qbuf = vidioc_qbuf,
2217 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2218 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2219 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2220 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2221 .vidioc_streamon = vidioc_streamon,
2222 .vidioc_queryctrl = vidioc_queryctrl,
2223 .vidioc_g_ctrl = vidioc_g_ctrl,
2224 .vidioc_s_ctrl = vidioc_s_ctrl,
2225 .vidioc_querymenu = vidioc_querymenu,
2226 .vidioc_enum_input = vidioc_enum_input,
2227 .vidioc_g_input = vidioc_g_input,
2228 .vidioc_s_input = vidioc_s_input,
2229 .vidioc_reqbufs = vidioc_reqbufs,
2230 .vidioc_querybuf = vidioc_querybuf,
2231 .vidioc_streamoff = vidioc_streamoff,
2232 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2233 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2234 .vidioc_g_parm = vidioc_g_parm,
2235 .vidioc_s_parm = vidioc_s_parm,
2236 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2237 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2238 #ifdef CONFIG_VIDEO_ADV_DEBUG
2239 .vidioc_g_register = vidioc_g_register,
2240 .vidioc_s_register = vidioc_s_register,
2241 #endif
2242 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2243 };
2244
2245 static const struct video_device gspca_template = {
2246 .name = "gspca main driver",
2247 .fops = &dev_fops,
2248 .ioctl_ops = &dev_ioctl_ops,
2249 .release = gspca_release,
2250 };
2251
2252 /* initialize the controls */
2253 static void ctrls_init(struct gspca_dev *gspca_dev)
2254 {
2255 struct gspca_ctrl *ctrl;
2256 int i;
2257
2258 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2259 i < gspca_dev->sd_desc->nctrls;
2260 i++, ctrl++) {
2261 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2262 ctrl->val = ctrl->def;
2263 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2264 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2265 }
2266 }
2267
2268 /*
2269 * probe and create a new gspca device
2270 *
2271 * This function must be called by the sub-driver when it is
2272 * called for probing a new device.
2273 */
2274 int gspca_dev_probe2(struct usb_interface *intf,
2275 const struct usb_device_id *id,
2276 const struct sd_desc *sd_desc,
2277 int dev_size,
2278 struct module *module)
2279 {
2280 struct gspca_dev *gspca_dev;
2281 struct usb_device *dev = interface_to_usbdev(intf);
2282 int ret;
2283
2284 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2285 sd_desc->name, id->idVendor, id->idProduct);
2286
2287 /* create the device */
2288 if (dev_size < sizeof *gspca_dev)
2289 dev_size = sizeof *gspca_dev;
2290 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2291 if (!gspca_dev) {
2292 pr_err("couldn't kzalloc gspca struct\n");
2293 return -ENOMEM;
2294 }
2295 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2296 if (!gspca_dev->usb_buf) {
2297 pr_err("out of memory\n");
2298 ret = -ENOMEM;
2299 goto out;
2300 }
2301 gspca_dev->dev = dev;
2302 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2303 gspca_dev->nbalt = intf->num_altsetting;
2304
2305 /* check if any audio device */
2306 if (dev->config->desc.bNumInterfaces != 1) {
2307 int i;
2308 struct usb_interface *intf2;
2309
2310 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2311 intf2 = dev->config->interface[i];
2312 if (intf2 != NULL
2313 && intf2->altsetting != NULL
2314 && intf2->altsetting->desc.bInterfaceClass ==
2315 USB_CLASS_AUDIO) {
2316 gspca_dev->audio = 1;
2317 break;
2318 }
2319 }
2320 }
2321
2322 gspca_dev->sd_desc = sd_desc;
2323 gspca_dev->nbufread = 2;
2324 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2325
2326 /* configure the subdriver and initialize the USB device */
2327 ret = sd_desc->config(gspca_dev, id);
2328 if (ret < 0)
2329 goto out;
2330 if (gspca_dev->cam.ctrls != NULL)
2331 ctrls_init(gspca_dev);
2332 ret = sd_desc->init(gspca_dev);
2333 if (ret < 0)
2334 goto out;
2335 gspca_set_default_mode(gspca_dev);
2336
2337 ret = gspca_input_connect(gspca_dev);
2338 if (ret)
2339 goto out;
2340
2341 mutex_init(&gspca_dev->usb_lock);
2342 mutex_init(&gspca_dev->queue_lock);
2343 init_waitqueue_head(&gspca_dev->wq);
2344
2345 /* init video stuff */
2346 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2347 gspca_dev->vdev.parent = &intf->dev;
2348 gspca_dev->module = module;
2349 gspca_dev->present = 1;
2350 ret = video_register_device(&gspca_dev->vdev,
2351 VFL_TYPE_GRABBER,
2352 -1);
2353 if (ret < 0) {
2354 pr_err("video_register_device err %d\n", ret);
2355 goto out;
2356 }
2357
2358 usb_set_intfdata(intf, gspca_dev);
2359 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2360
2361 gspca_input_create_urb(gspca_dev);
2362
2363 return 0;
2364 out:
2365 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2366 if (gspca_dev->input_dev)
2367 input_unregister_device(gspca_dev->input_dev);
2368 #endif
2369 kfree(gspca_dev->usb_buf);
2370 kfree(gspca_dev);
2371 return ret;
2372 }
2373 EXPORT_SYMBOL(gspca_dev_probe2);
2374
2375 /* same function as the previous one, but check the interface */
2376 int gspca_dev_probe(struct usb_interface *intf,
2377 const struct usb_device_id *id,
2378 const struct sd_desc *sd_desc,
2379 int dev_size,
2380 struct module *module)
2381 {
2382 struct usb_device *dev = interface_to_usbdev(intf);
2383
2384 /* we don't handle multi-config cameras */
2385 if (dev->descriptor.bNumConfigurations != 1) {
2386 pr_err("%04x:%04x too many config\n",
2387 id->idVendor, id->idProduct);
2388 return -ENODEV;
2389 }
2390
2391 /* the USB video interface must be the first one */
2392 if (dev->config->desc.bNumInterfaces != 1
2393 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2394 return -ENODEV;
2395
2396 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2397 }
2398 EXPORT_SYMBOL(gspca_dev_probe);
2399
2400 /*
2401 * USB disconnection
2402 *
2403 * This function must be called by the sub-driver
2404 * when the device disconnects, after the specific resources are freed.
2405 */
2406 void gspca_disconnect(struct usb_interface *intf)
2407 {
2408 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2409 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2410 struct input_dev *input_dev;
2411 #endif
2412
2413 PDEBUG(D_PROBE, "%s disconnect",
2414 video_device_node_name(&gspca_dev->vdev));
2415 mutex_lock(&gspca_dev->usb_lock);
2416
2417 gspca_dev->present = 0;
2418 wake_up_interruptible(&gspca_dev->wq);
2419
2420 destroy_urbs(gspca_dev);
2421
2422 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2423 gspca_input_destroy_urb(gspca_dev);
2424 input_dev = gspca_dev->input_dev;
2425 if (input_dev) {
2426 gspca_dev->input_dev = NULL;
2427 input_unregister_device(input_dev);
2428 }
2429 #endif
2430
2431 /* the device is freed at exit of this function */
2432 gspca_dev->dev = NULL;
2433 mutex_unlock(&gspca_dev->usb_lock);
2434
2435 usb_set_intfdata(intf, NULL);
2436
2437 /* release the device */
2438 /* (this will call gspca_release() immediately or on last close) */
2439 video_unregister_device(&gspca_dev->vdev);
2440
2441 /* PDEBUG(D_PROBE, "disconnect complete"); */
2442 }
2443 EXPORT_SYMBOL(gspca_disconnect);
2444
2445 #ifdef CONFIG_PM
2446 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2447 {
2448 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2449
2450 if (!gspca_dev->streaming)
2451 return 0;
2452 gspca_dev->frozen = 1; /* avoid urb error messages */
2453 if (gspca_dev->sd_desc->stopN)
2454 gspca_dev->sd_desc->stopN(gspca_dev);
2455 destroy_urbs(gspca_dev);
2456 gspca_input_destroy_urb(gspca_dev);
2457 gspca_set_alt0(gspca_dev);
2458 if (gspca_dev->sd_desc->stop0)
2459 gspca_dev->sd_desc->stop0(gspca_dev);
2460 return 0;
2461 }
2462 EXPORT_SYMBOL(gspca_suspend);
2463
2464 int gspca_resume(struct usb_interface *intf)
2465 {
2466 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2467
2468 gspca_dev->frozen = 0;
2469 gspca_dev->sd_desc->init(gspca_dev);
2470 gspca_input_create_urb(gspca_dev);
2471 if (gspca_dev->streaming)
2472 return gspca_init_transfer(gspca_dev);
2473 return 0;
2474 }
2475 EXPORT_SYMBOL(gspca_resume);
2476 #endif
2477 /* -- cam driver utility functions -- */
2478
2479 /* auto gain and exposure algorithm based on the knee algorithm described here:
2480 http://ytse.tricolour.net/docs/LowLightOptimization.html
2481
2482 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2483 where changed. */
2484 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2485 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2486 {
2487 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2488 const struct ctrl *gain_ctrl = NULL;
2489 const struct ctrl *exposure_ctrl = NULL;
2490 const struct ctrl *autogain_ctrl = NULL;
2491 int retval = 0;
2492
2493 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2494 if (gspca_dev->ctrl_dis & (1 << i))
2495 continue;
2496 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2497 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2498 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2499 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2500 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2501 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2502 }
2503 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2504 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2505 "on cam without (auto)gain/exposure");
2506 return 0;
2507 }
2508
2509 if (gain_ctrl->get(gspca_dev, &gain) ||
2510 exposure_ctrl->get(gspca_dev, &exposure) ||
2511 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2512 return 0;
2513
2514 orig_gain = gain;
2515 orig_exposure = exposure;
2516
2517 /* If we are of a multiple of deadzone, do multiple steps to reach the
2518 desired lumination fast (with the risc of a slight overshoot) */
2519 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2520
2521 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2522 avg_lum, desired_avg_lum, steps);
2523
2524 for (i = 0; i < steps; i++) {
2525 if (avg_lum > desired_avg_lum) {
2526 if (gain > gain_knee)
2527 gain--;
2528 else if (exposure > exposure_knee)
2529 exposure--;
2530 else if (gain > gain_ctrl->qctrl.default_value)
2531 gain--;
2532 else if (exposure > exposure_ctrl->qctrl.minimum)
2533 exposure--;
2534 else if (gain > gain_ctrl->qctrl.minimum)
2535 gain--;
2536 else
2537 break;
2538 } else {
2539 if (gain < gain_ctrl->qctrl.default_value)
2540 gain++;
2541 else if (exposure < exposure_knee)
2542 exposure++;
2543 else if (gain < gain_knee)
2544 gain++;
2545 else if (exposure < exposure_ctrl->qctrl.maximum)
2546 exposure++;
2547 else if (gain < gain_ctrl->qctrl.maximum)
2548 gain++;
2549 else
2550 break;
2551 }
2552 }
2553
2554 if (gain != orig_gain) {
2555 gain_ctrl->set(gspca_dev, gain);
2556 retval = 1;
2557 }
2558 if (exposure != orig_exposure) {
2559 exposure_ctrl->set(gspca_dev, exposure);
2560 retval = 1;
2561 }
2562
2563 return retval;
2564 }
2565 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2566
2567 /* -- module insert / remove -- */
2568 static int __init gspca_init(void)
2569 {
2570 pr_info("v" GSPCA_VERSION " registered\n");
2571 return 0;
2572 }
2573 static void __exit gspca_exit(void)
2574 {
2575 }
2576
2577 module_init(gspca_init);
2578 module_exit(gspca_exit);
2579
2580 #ifdef GSPCA_DEBUG
2581 module_param_named(debug, gspca_debug, int, 0644);
2582 MODULE_PARM_DESC(debug,
2583 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2584 " 0x08:stream 0x10:frame 0x20:packet"
2585 " 0x0100: v4l2");
2586 #endif
Linux kernel - Deliverables
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