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[media] gspca: Add a need_max_bandwidth flag to sd_desc
[mirror_ubuntu-zesty-kernel.git] / drivers / media / video / gspca / gspca.c
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
5 *
6 * Camera button input handling by Márton Németh
7 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #define 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 /* get the (max) image size */
637 i = gspca_dev->curr_mode;
638 bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
639
640 /* if the image is compressed, estimate its mean size */
641 if (!gspca_dev->cam.needs_full_bandwidth &&
642 bandwidth < gspca_dev->cam.cam_mode[i].width *
643 gspca_dev->cam.cam_mode[i].height)
644 bandwidth = bandwidth * 3 / 8; /* 0.375 */
645
646 /* estimate the frame rate */
647 if (gspca_dev->sd_desc->get_streamparm) {
648 struct v4l2_streamparm parm;
649
650 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
651 bandwidth *= parm.parm.capture.timeperframe.denominator;
652 bandwidth /= parm.parm.capture.timeperframe.numerator;
653 } else {
654
655 /* don't hope more than 15 fps with USB 1.1 and
656 * image resolution >= 640x480 */
657 if (gspca_dev->width >= 640
658 && gspca_dev->dev->speed == USB_SPEED_FULL)
659 bandwidth *= 15; /* 15 fps */
660 else
661 bandwidth *= 30; /* 30 fps */
662 }
663
664 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
665 return bandwidth;
666 }
667
668 /* endpoint table */
669 #define MAX_ALT 16
670 struct ep_tb_s {
671 u32 alt;
672 u32 bandwidth;
673 };
674
675 /*
676 * build the table of the endpoints
677 * and compute the minimum bandwidth for the image transfer
678 */
679 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
680 struct usb_interface *intf,
681 struct ep_tb_s *ep_tb)
682 {
683 struct usb_host_endpoint *ep;
684 int i, j, nbalt, psize, found;
685 u32 bandwidth, last_bw;
686
687 nbalt = intf->num_altsetting;
688 if (nbalt > MAX_ALT)
689 nbalt = MAX_ALT; /* fixme: should warn */
690
691 /* build the endpoint table */
692 i = 0;
693 last_bw = 0;
694 for (;;) {
695 ep_tb->bandwidth = 2000 * 2000 * 120;
696 found = 0;
697 for (j = 0; j < nbalt; j++) {
698 ep = alt_xfer(&intf->altsetting[j],
699 USB_ENDPOINT_XFER_ISOC);
700 if (ep == NULL)
701 continue;
702 if (ep->desc.bInterval == 0) {
703 pr_err("alt %d iso endp with 0 interval\n", j);
704 continue;
705 }
706 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
707 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
708 bandwidth = psize * 1000;
709 if (gspca_dev->dev->speed == USB_SPEED_HIGH
710 || gspca_dev->dev->speed == USB_SPEED_SUPER)
711 bandwidth *= 8;
712 bandwidth /= 1 << (ep->desc.bInterval - 1);
713 if (bandwidth <= last_bw)
714 continue;
715 if (bandwidth < ep_tb->bandwidth) {
716 ep_tb->bandwidth = bandwidth;
717 ep_tb->alt = j;
718 found = 1;
719 }
720 }
721 if (!found)
722 break;
723 PDEBUG(D_STREAM, "alt %d bandwidth %d",
724 ep_tb->alt, ep_tb->bandwidth);
725 last_bw = ep_tb->bandwidth;
726 i++;
727 ep_tb++;
728 }
729
730 /*
731 * If the camera:
732 * has a usb audio class interface (a built in usb mic); and
733 * is a usb 1 full speed device; and
734 * uses the max full speed iso bandwidth; and
735 * and has more than 1 alt setting
736 * then skip the highest alt setting to spare bandwidth for the mic
737 */
738 if (gspca_dev->audio &&
739 gspca_dev->dev->speed == USB_SPEED_FULL &&
740 last_bw >= 1000000 &&
741 i > 1) {
742 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
743 i--;
744 ep_tb--;
745 }
746
747 /* get the requested bandwidth and start at the highest atlsetting */
748 bandwidth = which_bandwidth(gspca_dev);
749 ep_tb--;
750 while (i > 1) {
751 ep_tb--;
752 if (ep_tb->bandwidth < bandwidth)
753 break;
754 i--;
755 }
756 return i;
757 }
758
759 /*
760 * create the URBs for image transfer
761 */
762 static int create_urbs(struct gspca_dev *gspca_dev,
763 struct usb_host_endpoint *ep)
764 {
765 struct urb *urb;
766 int n, nurbs, i, psize, npkt, bsize;
767
768 /* calculate the packet size and the number of packets */
769 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
770
771 if (!gspca_dev->cam.bulk) { /* isoc */
772
773 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
774 if (gspca_dev->pkt_size == 0)
775 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
776 else
777 psize = gspca_dev->pkt_size;
778 npkt = gspca_dev->cam.npkt;
779 if (npkt == 0)
780 npkt = 32; /* default value */
781 bsize = psize * npkt;
782 PDEBUG(D_STREAM,
783 "isoc %d pkts size %d = bsize:%d",
784 npkt, psize, bsize);
785 nurbs = DEF_NURBS;
786 } else { /* bulk */
787 npkt = 0;
788 bsize = gspca_dev->cam.bulk_size;
789 if (bsize == 0)
790 bsize = psize;
791 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
792 if (gspca_dev->cam.bulk_nurbs != 0)
793 nurbs = gspca_dev->cam.bulk_nurbs;
794 else
795 nurbs = 1;
796 }
797
798 for (n = 0; n < nurbs; n++) {
799 urb = usb_alloc_urb(npkt, GFP_KERNEL);
800 if (!urb) {
801 pr_err("usb_alloc_urb failed\n");
802 return -ENOMEM;
803 }
804 gspca_dev->urb[n] = urb;
805 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
806 bsize,
807 GFP_KERNEL,
808 &urb->transfer_dma);
809
810 if (urb->transfer_buffer == NULL) {
811 pr_err("usb_alloc_coherent failed\n");
812 return -ENOMEM;
813 }
814 urb->dev = gspca_dev->dev;
815 urb->context = gspca_dev;
816 urb->transfer_buffer_length = bsize;
817 if (npkt != 0) { /* ISOC */
818 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
819 ep->desc.bEndpointAddress);
820 urb->transfer_flags = URB_ISO_ASAP
821 | URB_NO_TRANSFER_DMA_MAP;
822 urb->interval = 1 << (ep->desc.bInterval - 1);
823 urb->complete = isoc_irq;
824 urb->number_of_packets = npkt;
825 for (i = 0; i < npkt; i++) {
826 urb->iso_frame_desc[i].length = psize;
827 urb->iso_frame_desc[i].offset = psize * i;
828 }
829 } else { /* bulk */
830 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
831 ep->desc.bEndpointAddress);
832 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
833 urb->complete = bulk_irq;
834 }
835 }
836 return 0;
837 }
838
839 /*
840 * start the USB transfer
841 */
842 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
843 {
844 struct usb_interface *intf;
845 struct usb_host_endpoint *ep;
846 struct urb *urb;
847 struct ep_tb_s ep_tb[MAX_ALT];
848 int n, ret, xfer, alt, alt_idx;
849
850 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
851 return -ERESTARTSYS;
852
853 if (!gspca_dev->present) {
854 ret = -ENODEV;
855 goto unlock;
856 }
857
858 /* reset the streaming variables */
859 gspca_dev->image = NULL;
860 gspca_dev->image_len = 0;
861 gspca_dev->last_packet_type = DISCARD_PACKET;
862 gspca_dev->sequence = 0;
863
864 gspca_dev->usb_err = 0;
865
866 /* do the specific subdriver stuff before endpoint selection */
867 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
868 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
869 if (gspca_dev->sd_desc->isoc_init) {
870 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
871 if (ret < 0)
872 goto unlock;
873 }
874 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
875 : USB_ENDPOINT_XFER_ISOC;
876
877 /* if bulk or the subdriver forced an altsetting, get the endpoint */
878 if (gspca_dev->alt != 0) {
879 gspca_dev->alt--; /* (previous version compatibility) */
880 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
881 if (ep == NULL) {
882 pr_err("bad altsetting %d\n", gspca_dev->alt);
883 ret = -EIO;
884 goto out;
885 }
886 ep_tb[0].alt = gspca_dev->alt;
887 alt_idx = 1;
888 } else {
889
890 /* else, compute the minimum bandwidth
891 * and build the endpoint table */
892 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
893 if (alt_idx <= 0) {
894 pr_err("no transfer endpoint found\n");
895 ret = -EIO;
896 goto unlock;
897 }
898 }
899
900 /* set the highest alternate setting and
901 * loop until urb submit succeeds */
902 gspca_input_destroy_urb(gspca_dev);
903
904 gspca_dev->alt = ep_tb[--alt_idx].alt;
905 alt = -1;
906 for (;;) {
907 if (alt != gspca_dev->alt) {
908 alt = gspca_dev->alt;
909 if (intf->num_altsetting > 1) {
910 ret = usb_set_interface(gspca_dev->dev,
911 gspca_dev->iface,
912 alt);
913 if (ret < 0) {
914 if (ret == -ENOSPC)
915 goto retry; /*fixme: ugly*/
916 pr_err("set alt %d err %d\n", alt, ret);
917 goto out;
918 }
919 }
920 }
921 if (!gspca_dev->cam.no_urb_create) {
922 PDEBUG(D_STREAM, "init transfer alt %d", alt);
923 ret = create_urbs(gspca_dev,
924 alt_xfer(&intf->altsetting[alt], xfer));
925 if (ret < 0) {
926 destroy_urbs(gspca_dev);
927 goto out;
928 }
929 }
930
931 /* clear the bulk endpoint */
932 if (gspca_dev->cam.bulk)
933 usb_clear_halt(gspca_dev->dev,
934 gspca_dev->urb[0]->pipe);
935
936 /* start the cam */
937 ret = gspca_dev->sd_desc->start(gspca_dev);
938 if (ret < 0) {
939 destroy_urbs(gspca_dev);
940 goto out;
941 }
942 gspca_dev->streaming = 1;
943
944 /* some bulk transfers are started by the subdriver */
945 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
946 break;
947
948 /* submit the URBs */
949 for (n = 0; n < MAX_NURBS; n++) {
950 urb = gspca_dev->urb[n];
951 if (urb == NULL)
952 break;
953 ret = usb_submit_urb(urb, GFP_KERNEL);
954 if (ret < 0)
955 break;
956 }
957 if (ret >= 0)
958 break; /* transfer is started */
959
960 /* something when wrong
961 * stop the webcam and free the transfer resources */
962 gspca_stream_off(gspca_dev);
963 if (ret != -ENOSPC) {
964 pr_err("usb_submit_urb alt %d err %d\n",
965 gspca_dev->alt, ret);
966 goto out;
967 }
968
969 /* the bandwidth is not wide enough
970 * negotiate or try a lower alternate setting */
971 retry:
972 PDEBUG(D_ERR|D_STREAM,
973 "alt %d - bandwidth not wide enough - trying again",
974 alt);
975 msleep(20); /* wait for kill complete */
976 if (gspca_dev->sd_desc->isoc_nego) {
977 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
978 if (ret < 0)
979 goto out;
980 } else {
981 if (alt_idx <= 0) {
982 pr_err("no transfer endpoint found\n");
983 ret = -EIO;
984 goto out;
985 }
986 alt = ep_tb[--alt_idx].alt;
987 }
988 }
989 out:
990 gspca_input_create_urb(gspca_dev);
991 unlock:
992 mutex_unlock(&gspca_dev->usb_lock);
993 return ret;
994 }
995
996 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
997 {
998 struct gspca_ctrl *ctrl;
999 int i;
1000
1001 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
1002 gspca_dev->curr_mode = i;
1003 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
1004 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
1005 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
1006
1007 /* set the current control values to their default values
1008 * which may have changed in sd_init() */
1009 ctrl = gspca_dev->cam.ctrls;
1010 if (ctrl != NULL) {
1011 for (i = 0;
1012 i < gspca_dev->sd_desc->nctrls;
1013 i++, ctrl++)
1014 ctrl->val = ctrl->def;
1015 }
1016 }
1017
1018 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1019 int width, int height)
1020 {
1021 int i;
1022
1023 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1024 if (width >= gspca_dev->cam.cam_mode[i].width
1025 && height >= gspca_dev->cam.cam_mode[i].height)
1026 break;
1027 }
1028 return i;
1029 }
1030
1031 /*
1032 * search a mode with the right pixel format
1033 */
1034 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1035 int mode,
1036 int pixfmt)
1037 {
1038 int modeU, modeD;
1039
1040 modeU = modeD = mode;
1041 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1042 if (--modeD >= 0) {
1043 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1044 == pixfmt)
1045 return modeD;
1046 }
1047 if (++modeU < gspca_dev->cam.nmodes) {
1048 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1049 == pixfmt)
1050 return modeU;
1051 }
1052 }
1053 return -EINVAL;
1054 }
1055
1056 #ifdef CONFIG_VIDEO_ADV_DEBUG
1057 static int vidioc_g_register(struct file *file, void *priv,
1058 struct v4l2_dbg_register *reg)
1059 {
1060 int ret;
1061 struct gspca_dev *gspca_dev = priv;
1062
1063 if (!gspca_dev->sd_desc->get_chip_ident)
1064 return -EINVAL;
1065
1066 if (!gspca_dev->sd_desc->get_register)
1067 return -EINVAL;
1068
1069 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1070 return -ERESTARTSYS;
1071 gspca_dev->usb_err = 0;
1072 if (gspca_dev->present)
1073 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
1074 else
1075 ret = -ENODEV;
1076 mutex_unlock(&gspca_dev->usb_lock);
1077
1078 return ret;
1079 }
1080
1081 static int vidioc_s_register(struct file *file, void *priv,
1082 struct v4l2_dbg_register *reg)
1083 {
1084 int ret;
1085 struct gspca_dev *gspca_dev = priv;
1086
1087 if (!gspca_dev->sd_desc->get_chip_ident)
1088 return -EINVAL;
1089
1090 if (!gspca_dev->sd_desc->set_register)
1091 return -EINVAL;
1092
1093 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1094 return -ERESTARTSYS;
1095 gspca_dev->usb_err = 0;
1096 if (gspca_dev->present)
1097 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
1098 else
1099 ret = -ENODEV;
1100 mutex_unlock(&gspca_dev->usb_lock);
1101
1102 return ret;
1103 }
1104 #endif
1105
1106 static int vidioc_g_chip_ident(struct file *file, void *priv,
1107 struct v4l2_dbg_chip_ident *chip)
1108 {
1109 int ret;
1110 struct gspca_dev *gspca_dev = priv;
1111
1112 if (!gspca_dev->sd_desc->get_chip_ident)
1113 return -EINVAL;
1114
1115 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1116 return -ERESTARTSYS;
1117 gspca_dev->usb_err = 0;
1118 if (gspca_dev->present)
1119 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1120 else
1121 ret = -ENODEV;
1122 mutex_unlock(&gspca_dev->usb_lock);
1123
1124 return ret;
1125 }
1126
1127 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1128 struct v4l2_fmtdesc *fmtdesc)
1129 {
1130 struct gspca_dev *gspca_dev = priv;
1131 int i, j, index;
1132 __u32 fmt_tb[8];
1133
1134 /* give an index to each format */
1135 index = 0;
1136 j = 0;
1137 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1138 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1139 j = 0;
1140 for (;;) {
1141 if (fmt_tb[j] == fmt_tb[index])
1142 break;
1143 j++;
1144 }
1145 if (j == index) {
1146 if (fmtdesc->index == index)
1147 break; /* new format */
1148 index++;
1149 if (index >= ARRAY_SIZE(fmt_tb))
1150 return -EINVAL;
1151 }
1152 }
1153 if (i < 0)
1154 return -EINVAL; /* no more format */
1155
1156 fmtdesc->pixelformat = fmt_tb[index];
1157 if (gspca_dev->cam.cam_mode[i].sizeimage <
1158 gspca_dev->cam.cam_mode[i].width *
1159 gspca_dev->cam.cam_mode[i].height)
1160 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1161 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1162 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1163 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1164 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1165 fmtdesc->description[4] = '\0';
1166 return 0;
1167 }
1168
1169 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1170 struct v4l2_format *fmt)
1171 {
1172 struct gspca_dev *gspca_dev = priv;
1173 int mode;
1174
1175 mode = gspca_dev->curr_mode;
1176 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1177 sizeof fmt->fmt.pix);
1178 return 0;
1179 }
1180
1181 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1182 struct v4l2_format *fmt)
1183 {
1184 int w, h, mode, mode2;
1185
1186 w = fmt->fmt.pix.width;
1187 h = fmt->fmt.pix.height;
1188
1189 #ifdef GSPCA_DEBUG
1190 if (gspca_debug & D_CONF)
1191 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1192 #endif
1193 /* search the closest mode for width and height */
1194 mode = wxh_to_mode(gspca_dev, w, h);
1195
1196 /* OK if right palette */
1197 if (gspca_dev->cam.cam_mode[mode].pixelformat
1198 != fmt->fmt.pix.pixelformat) {
1199
1200 /* else, search the closest mode with the same pixel format */
1201 mode2 = gspca_get_mode(gspca_dev, mode,
1202 fmt->fmt.pix.pixelformat);
1203 if (mode2 >= 0)
1204 mode = mode2;
1205 /* else
1206 ; * no chance, return this mode */
1207 }
1208 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1209 sizeof fmt->fmt.pix);
1210 return mode; /* used when s_fmt */
1211 }
1212
1213 static int vidioc_try_fmt_vid_cap(struct file *file,
1214 void *priv,
1215 struct v4l2_format *fmt)
1216 {
1217 struct gspca_dev *gspca_dev = priv;
1218 int ret;
1219
1220 ret = try_fmt_vid_cap(gspca_dev, fmt);
1221 if (ret < 0)
1222 return ret;
1223 return 0;
1224 }
1225
1226 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1227 struct v4l2_format *fmt)
1228 {
1229 struct gspca_dev *gspca_dev = priv;
1230 int ret;
1231
1232 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1233 return -ERESTARTSYS;
1234
1235 ret = try_fmt_vid_cap(gspca_dev, fmt);
1236 if (ret < 0)
1237 goto out;
1238
1239 if (gspca_dev->nframes != 0
1240 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1241 ret = -EINVAL;
1242 goto out;
1243 }
1244
1245 if (ret == gspca_dev->curr_mode) {
1246 ret = 0;
1247 goto out; /* same mode */
1248 }
1249
1250 if (gspca_dev->streaming) {
1251 ret = -EBUSY;
1252 goto out;
1253 }
1254 gspca_dev->width = fmt->fmt.pix.width;
1255 gspca_dev->height = fmt->fmt.pix.height;
1256 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1257 gspca_dev->curr_mode = ret;
1258
1259 ret = 0;
1260 out:
1261 mutex_unlock(&gspca_dev->queue_lock);
1262 return ret;
1263 }
1264
1265 static int vidioc_enum_framesizes(struct file *file, void *priv,
1266 struct v4l2_frmsizeenum *fsize)
1267 {
1268 struct gspca_dev *gspca_dev = priv;
1269 int i;
1270 __u32 index = 0;
1271
1272 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1273 if (fsize->pixel_format !=
1274 gspca_dev->cam.cam_mode[i].pixelformat)
1275 continue;
1276
1277 if (fsize->index == index) {
1278 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1279 fsize->discrete.width =
1280 gspca_dev->cam.cam_mode[i].width;
1281 fsize->discrete.height =
1282 gspca_dev->cam.cam_mode[i].height;
1283 return 0;
1284 }
1285 index++;
1286 }
1287
1288 return -EINVAL;
1289 }
1290
1291 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1292 struct v4l2_frmivalenum *fival)
1293 {
1294 struct gspca_dev *gspca_dev = priv;
1295 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1296 __u32 i;
1297
1298 if (gspca_dev->cam.mode_framerates == NULL ||
1299 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1300 return -EINVAL;
1301
1302 if (fival->pixel_format !=
1303 gspca_dev->cam.cam_mode[mode].pixelformat)
1304 return -EINVAL;
1305
1306 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1307 if (fival->index == i) {
1308 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1309 fival->discrete.numerator = 1;
1310 fival->discrete.denominator =
1311 gspca_dev->cam.mode_framerates[mode].rates[i];
1312 return 0;
1313 }
1314 }
1315
1316 return -EINVAL;
1317 }
1318
1319 static void gspca_release(struct video_device *vfd)
1320 {
1321 struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1322
1323 PDEBUG(D_PROBE, "%s released",
1324 video_device_node_name(&gspca_dev->vdev));
1325
1326 kfree(gspca_dev->usb_buf);
1327 kfree(gspca_dev);
1328 }
1329
1330 static int dev_open(struct file *file)
1331 {
1332 struct gspca_dev *gspca_dev;
1333
1334 PDEBUG(D_STREAM, "[%s] open", current->comm);
1335 gspca_dev = (struct gspca_dev *) video_devdata(file);
1336 if (!gspca_dev->present)
1337 return -ENODEV;
1338
1339 /* protect the subdriver against rmmod */
1340 if (!try_module_get(gspca_dev->module))
1341 return -ENODEV;
1342
1343 file->private_data = gspca_dev;
1344 #ifdef GSPCA_DEBUG
1345 /* activate the v4l2 debug */
1346 if (gspca_debug & D_V4L2)
1347 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1348 | V4L2_DEBUG_IOCTL_ARG;
1349 else
1350 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1351 | V4L2_DEBUG_IOCTL_ARG);
1352 #endif
1353 return 0;
1354 }
1355
1356 static int dev_close(struct file *file)
1357 {
1358 struct gspca_dev *gspca_dev = file->private_data;
1359
1360 PDEBUG(D_STREAM, "[%s] close", current->comm);
1361 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1362 return -ERESTARTSYS;
1363
1364 /* if the file did the capture, free the streaming resources */
1365 if (gspca_dev->capt_file == file) {
1366 if (gspca_dev->streaming) {
1367 mutex_lock(&gspca_dev->usb_lock);
1368 gspca_dev->usb_err = 0;
1369 gspca_stream_off(gspca_dev);
1370 mutex_unlock(&gspca_dev->usb_lock);
1371 }
1372 frame_free(gspca_dev);
1373 }
1374 file->private_data = NULL;
1375 module_put(gspca_dev->module);
1376 mutex_unlock(&gspca_dev->queue_lock);
1377
1378 PDEBUG(D_STREAM, "close done");
1379
1380 return 0;
1381 }
1382
1383 static int vidioc_querycap(struct file *file, void *priv,
1384 struct v4l2_capability *cap)
1385 {
1386 struct gspca_dev *gspca_dev = priv;
1387 int ret;
1388
1389 /* protect the access to the usb device */
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 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1397 sizeof cap->driver);
1398 if (gspca_dev->dev->product != NULL) {
1399 strlcpy((char *) cap->card, gspca_dev->dev->product,
1400 sizeof cap->card);
1401 } else {
1402 snprintf((char *) cap->card, sizeof cap->card,
1403 "USB Camera (%04x:%04x)",
1404 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1405 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1406 }
1407 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1408 sizeof(cap->bus_info));
1409 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1410 | V4L2_CAP_STREAMING
1411 | V4L2_CAP_READWRITE;
1412 ret = 0;
1413 out:
1414 mutex_unlock(&gspca_dev->usb_lock);
1415 return ret;
1416 }
1417
1418 static int get_ctrl(struct gspca_dev *gspca_dev,
1419 int id)
1420 {
1421 const struct ctrl *ctrls;
1422 int i;
1423
1424 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1425 i < gspca_dev->sd_desc->nctrls;
1426 i++, ctrls++) {
1427 if (gspca_dev->ctrl_dis & (1 << i))
1428 continue;
1429 if (id == ctrls->qctrl.id)
1430 return i;
1431 }
1432 return -1;
1433 }
1434
1435 static int vidioc_queryctrl(struct file *file, void *priv,
1436 struct v4l2_queryctrl *q_ctrl)
1437 {
1438 struct gspca_dev *gspca_dev = priv;
1439 const struct ctrl *ctrls;
1440 struct gspca_ctrl *gspca_ctrl;
1441 int i, idx;
1442 u32 id;
1443
1444 id = q_ctrl->id;
1445 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1446 id &= V4L2_CTRL_ID_MASK;
1447 id++;
1448 idx = -1;
1449 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1450 if (gspca_dev->ctrl_dis & (1 << i))
1451 continue;
1452 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1453 continue;
1454 if (idx >= 0
1455 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1456 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1457 continue;
1458 idx = i;
1459 }
1460 } else {
1461 idx = get_ctrl(gspca_dev, id);
1462 }
1463 if (idx < 0)
1464 return -EINVAL;
1465 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1466 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1467 if (gspca_dev->cam.ctrls != NULL) {
1468 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1469 q_ctrl->default_value = gspca_ctrl->def;
1470 q_ctrl->minimum = gspca_ctrl->min;
1471 q_ctrl->maximum = gspca_ctrl->max;
1472 }
1473 if (gspca_dev->ctrl_inac & (1 << idx))
1474 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1475 return 0;
1476 }
1477
1478 static int vidioc_s_ctrl(struct file *file, void *priv,
1479 struct v4l2_control *ctrl)
1480 {
1481 struct gspca_dev *gspca_dev = priv;
1482 const struct ctrl *ctrls;
1483 struct gspca_ctrl *gspca_ctrl;
1484 int idx, ret;
1485
1486 idx = get_ctrl(gspca_dev, ctrl->id);
1487 if (idx < 0)
1488 return -EINVAL;
1489 if (gspca_dev->ctrl_inac & (1 << idx))
1490 return -EINVAL;
1491 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1492 if (gspca_dev->cam.ctrls != NULL) {
1493 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1494 if (ctrl->value < gspca_ctrl->min
1495 || ctrl->value > gspca_ctrl->max)
1496 return -ERANGE;
1497 } else {
1498 gspca_ctrl = NULL;
1499 if (ctrl->value < ctrls->qctrl.minimum
1500 || ctrl->value > ctrls->qctrl.maximum)
1501 return -ERANGE;
1502 }
1503 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1504 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1505 return -ERESTARTSYS;
1506 if (!gspca_dev->present) {
1507 ret = -ENODEV;
1508 goto out;
1509 }
1510 gspca_dev->usb_err = 0;
1511 if (ctrls->set != NULL) {
1512 ret = ctrls->set(gspca_dev, ctrl->value);
1513 goto out;
1514 }
1515 if (gspca_ctrl != NULL) {
1516 gspca_ctrl->val = ctrl->value;
1517 if (ctrls->set_control != NULL
1518 && gspca_dev->streaming)
1519 ctrls->set_control(gspca_dev);
1520 }
1521 ret = gspca_dev->usb_err;
1522 out:
1523 mutex_unlock(&gspca_dev->usb_lock);
1524 return ret;
1525 }
1526
1527 static int vidioc_g_ctrl(struct file *file, void *priv,
1528 struct v4l2_control *ctrl)
1529 {
1530 struct gspca_dev *gspca_dev = priv;
1531 const struct ctrl *ctrls;
1532 int idx, ret;
1533
1534 idx = get_ctrl(gspca_dev, ctrl->id);
1535 if (idx < 0)
1536 return -EINVAL;
1537 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1538
1539 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1540 return -ERESTARTSYS;
1541 if (!gspca_dev->present) {
1542 ret = -ENODEV;
1543 goto out;
1544 }
1545 gspca_dev->usb_err = 0;
1546 if (ctrls->get != NULL) {
1547 ret = ctrls->get(gspca_dev, &ctrl->value);
1548 goto out;
1549 }
1550 if (gspca_dev->cam.ctrls != NULL)
1551 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1552 ret = 0;
1553 out:
1554 mutex_unlock(&gspca_dev->usb_lock);
1555 return ret;
1556 }
1557
1558 static int vidioc_querymenu(struct file *file, void *priv,
1559 struct v4l2_querymenu *qmenu)
1560 {
1561 struct gspca_dev *gspca_dev = priv;
1562
1563 if (!gspca_dev->sd_desc->querymenu)
1564 return -EINVAL;
1565 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1566 }
1567
1568 static int vidioc_enum_input(struct file *file, void *priv,
1569 struct v4l2_input *input)
1570 {
1571 struct gspca_dev *gspca_dev = priv;
1572
1573 if (input->index != 0)
1574 return -EINVAL;
1575 input->type = V4L2_INPUT_TYPE_CAMERA;
1576 input->status = gspca_dev->cam.input_flags;
1577 strlcpy(input->name, gspca_dev->sd_desc->name,
1578 sizeof input->name);
1579 return 0;
1580 }
1581
1582 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1583 {
1584 *i = 0;
1585 return 0;
1586 }
1587
1588 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1589 {
1590 if (i > 0)
1591 return -EINVAL;
1592 return (0);
1593 }
1594
1595 static int vidioc_reqbufs(struct file *file, void *priv,
1596 struct v4l2_requestbuffers *rb)
1597 {
1598 struct gspca_dev *gspca_dev = priv;
1599 int i, ret = 0, streaming;
1600
1601 i = rb->memory; /* (avoid compilation warning) */
1602 switch (i) {
1603 case GSPCA_MEMORY_READ: /* (internal call) */
1604 case V4L2_MEMORY_MMAP:
1605 case V4L2_MEMORY_USERPTR:
1606 break;
1607 default:
1608 return -EINVAL;
1609 }
1610 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1611 return -ERESTARTSYS;
1612
1613 if (gspca_dev->memory != GSPCA_MEMORY_NO
1614 && gspca_dev->memory != GSPCA_MEMORY_READ
1615 && gspca_dev->memory != rb->memory) {
1616 ret = -EBUSY;
1617 goto out;
1618 }
1619
1620 /* only one file may do the capture */
1621 if (gspca_dev->capt_file != NULL
1622 && gspca_dev->capt_file != file) {
1623 ret = -EBUSY;
1624 goto out;
1625 }
1626
1627 /* if allocated, the buffers must not be mapped */
1628 for (i = 0; i < gspca_dev->nframes; i++) {
1629 if (gspca_dev->frame[i].vma_use_count) {
1630 ret = -EBUSY;
1631 goto out;
1632 }
1633 }
1634
1635 /* stop streaming */
1636 streaming = gspca_dev->streaming;
1637 if (streaming) {
1638 mutex_lock(&gspca_dev->usb_lock);
1639 gspca_dev->usb_err = 0;
1640 gspca_stream_off(gspca_dev);
1641 mutex_unlock(&gspca_dev->usb_lock);
1642
1643 /* Don't restart the stream when switching from read
1644 * to mmap mode */
1645 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1646 streaming = 0;
1647 }
1648
1649 /* free the previous allocated buffers, if any */
1650 if (gspca_dev->nframes != 0)
1651 frame_free(gspca_dev);
1652 if (rb->count == 0) /* unrequest */
1653 goto out;
1654 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1655 if (ret == 0) {
1656 rb->count = gspca_dev->nframes;
1657 if (streaming)
1658 ret = gspca_init_transfer(gspca_dev);
1659 }
1660 out:
1661 mutex_unlock(&gspca_dev->queue_lock);
1662 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1663 return ret;
1664 }
1665
1666 static int vidioc_querybuf(struct file *file, void *priv,
1667 struct v4l2_buffer *v4l2_buf)
1668 {
1669 struct gspca_dev *gspca_dev = priv;
1670 struct gspca_frame *frame;
1671
1672 if (v4l2_buf->index < 0
1673 || v4l2_buf->index >= gspca_dev->nframes)
1674 return -EINVAL;
1675
1676 frame = &gspca_dev->frame[v4l2_buf->index];
1677 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1678 return 0;
1679 }
1680
1681 static int vidioc_streamon(struct file *file, void *priv,
1682 enum v4l2_buf_type buf_type)
1683 {
1684 struct gspca_dev *gspca_dev = priv;
1685 int ret;
1686
1687 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1688 return -EINVAL;
1689 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1690 return -ERESTARTSYS;
1691
1692 /* check the capture file */
1693 if (gspca_dev->capt_file != file) {
1694 ret = -EBUSY;
1695 goto out;
1696 }
1697
1698 if (gspca_dev->nframes == 0
1699 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1700 ret = -EINVAL;
1701 goto out;
1702 }
1703 if (!gspca_dev->streaming) {
1704 ret = gspca_init_transfer(gspca_dev);
1705 if (ret < 0)
1706 goto out;
1707 }
1708 #ifdef GSPCA_DEBUG
1709 if (gspca_debug & D_STREAM) {
1710 PDEBUG_MODE("stream on OK",
1711 gspca_dev->pixfmt,
1712 gspca_dev->width,
1713 gspca_dev->height);
1714 }
1715 #endif
1716 ret = 0;
1717 out:
1718 mutex_unlock(&gspca_dev->queue_lock);
1719 return ret;
1720 }
1721
1722 static int vidioc_streamoff(struct file *file, void *priv,
1723 enum v4l2_buf_type buf_type)
1724 {
1725 struct gspca_dev *gspca_dev = priv;
1726 int ret;
1727
1728 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1729 return -EINVAL;
1730
1731 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1732 return -ERESTARTSYS;
1733
1734 if (!gspca_dev->streaming) {
1735 ret = 0;
1736 goto out;
1737 }
1738
1739 /* check the capture file */
1740 if (gspca_dev->capt_file != file) {
1741 ret = -EBUSY;
1742 goto out;
1743 }
1744
1745 /* stop streaming */
1746 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1747 ret = -ERESTARTSYS;
1748 goto out;
1749 }
1750 gspca_dev->usb_err = 0;
1751 gspca_stream_off(gspca_dev);
1752 mutex_unlock(&gspca_dev->usb_lock);
1753 /* In case another thread is waiting in dqbuf */
1754 wake_up_interruptible(&gspca_dev->wq);
1755
1756 /* empty the transfer queues */
1757 atomic_set(&gspca_dev->fr_q, 0);
1758 atomic_set(&gspca_dev->fr_i, 0);
1759 gspca_dev->fr_o = 0;
1760 ret = 0;
1761 out:
1762 mutex_unlock(&gspca_dev->queue_lock);
1763 return ret;
1764 }
1765
1766 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1767 struct v4l2_jpegcompression *jpegcomp)
1768 {
1769 struct gspca_dev *gspca_dev = priv;
1770 int ret;
1771
1772 if (!gspca_dev->sd_desc->get_jcomp)
1773 return -EINVAL;
1774 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1775 return -ERESTARTSYS;
1776 gspca_dev->usb_err = 0;
1777 if (gspca_dev->present)
1778 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1779 else
1780 ret = -ENODEV;
1781 mutex_unlock(&gspca_dev->usb_lock);
1782 return ret;
1783 }
1784
1785 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1786 struct v4l2_jpegcompression *jpegcomp)
1787 {
1788 struct gspca_dev *gspca_dev = priv;
1789 int ret;
1790
1791 if (!gspca_dev->sd_desc->set_jcomp)
1792 return -EINVAL;
1793 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1794 return -ERESTARTSYS;
1795 gspca_dev->usb_err = 0;
1796 if (gspca_dev->present)
1797 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1798 else
1799 ret = -ENODEV;
1800 mutex_unlock(&gspca_dev->usb_lock);
1801 return ret;
1802 }
1803
1804 static int vidioc_g_parm(struct file *filp, void *priv,
1805 struct v4l2_streamparm *parm)
1806 {
1807 struct gspca_dev *gspca_dev = priv;
1808
1809 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1810
1811 if (gspca_dev->sd_desc->get_streamparm) {
1812 int ret;
1813
1814 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1815 return -ERESTARTSYS;
1816 if (gspca_dev->present) {
1817 gspca_dev->usb_err = 0;
1818 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1819 ret = gspca_dev->usb_err;
1820 } else {
1821 ret = -ENODEV;
1822 }
1823 mutex_unlock(&gspca_dev->usb_lock);
1824 return ret;
1825 }
1826
1827 return 0;
1828 }
1829
1830 static int vidioc_s_parm(struct file *filp, void *priv,
1831 struct v4l2_streamparm *parm)
1832 {
1833 struct gspca_dev *gspca_dev = priv;
1834 int n;
1835
1836 n = parm->parm.capture.readbuffers;
1837 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1838 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1839 else
1840 gspca_dev->nbufread = n;
1841
1842 if (gspca_dev->sd_desc->set_streamparm) {
1843 int ret;
1844
1845 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1846 return -ERESTARTSYS;
1847 if (gspca_dev->present) {
1848 gspca_dev->usb_err = 0;
1849 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1850 ret = gspca_dev->usb_err;
1851 } else {
1852 ret = -ENODEV;
1853 }
1854 mutex_unlock(&gspca_dev->usb_lock);
1855 return ret;
1856 }
1857
1858 return 0;
1859 }
1860
1861 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1862 {
1863 struct gspca_dev *gspca_dev = file->private_data;
1864 struct gspca_frame *frame;
1865 struct page *page;
1866 unsigned long addr, start, size;
1867 int i, ret;
1868
1869 start = vma->vm_start;
1870 size = vma->vm_end - vma->vm_start;
1871 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1872
1873 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1874 return -ERESTARTSYS;
1875 if (!gspca_dev->present) {
1876 ret = -ENODEV;
1877 goto out;
1878 }
1879 if (gspca_dev->capt_file != file) {
1880 ret = -EINVAL;
1881 goto out;
1882 }
1883
1884 frame = NULL;
1885 for (i = 0; i < gspca_dev->nframes; ++i) {
1886 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1887 PDEBUG(D_STREAM, "mmap bad memory type");
1888 break;
1889 }
1890 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1891 == vma->vm_pgoff) {
1892 frame = &gspca_dev->frame[i];
1893 break;
1894 }
1895 }
1896 if (frame == NULL) {
1897 PDEBUG(D_STREAM, "mmap no frame buffer found");
1898 ret = -EINVAL;
1899 goto out;
1900 }
1901 if (size != frame->v4l2_buf.length) {
1902 PDEBUG(D_STREAM, "mmap bad size");
1903 ret = -EINVAL;
1904 goto out;
1905 }
1906
1907 /*
1908 * - VM_IO marks the area as being a mmaped region for I/O to a
1909 * device. It also prevents the region from being core dumped.
1910 */
1911 vma->vm_flags |= VM_IO;
1912
1913 addr = (unsigned long) frame->data;
1914 while (size > 0) {
1915 page = vmalloc_to_page((void *) addr);
1916 ret = vm_insert_page(vma, start, page);
1917 if (ret < 0)
1918 goto out;
1919 start += PAGE_SIZE;
1920 addr += PAGE_SIZE;
1921 size -= PAGE_SIZE;
1922 }
1923
1924 vma->vm_ops = &gspca_vm_ops;
1925 vma->vm_private_data = frame;
1926 gspca_vm_open(vma);
1927 ret = 0;
1928 out:
1929 mutex_unlock(&gspca_dev->queue_lock);
1930 return ret;
1931 }
1932
1933 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1934 enum v4l2_memory memory)
1935 {
1936 if (!gspca_dev->present)
1937 return -ENODEV;
1938 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1939 !gspca_dev->streaming)
1940 return -EINVAL;
1941
1942 /* check if a frame is ready */
1943 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1944 }
1945
1946 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1947 enum v4l2_memory memory)
1948 {
1949 int ret;
1950
1951 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1952 return -ERESTARTSYS;
1953 ret = frame_ready_nolock(gspca_dev, file, memory);
1954 mutex_unlock(&gspca_dev->queue_lock);
1955 return ret;
1956 }
1957
1958 /*
1959 * dequeue a video buffer
1960 *
1961 * If nonblock_ing is false, block until a buffer is available.
1962 */
1963 static int vidioc_dqbuf(struct file *file, void *priv,
1964 struct v4l2_buffer *v4l2_buf)
1965 {
1966 struct gspca_dev *gspca_dev = priv;
1967 struct gspca_frame *frame;
1968 int i, j, ret;
1969
1970 PDEBUG(D_FRAM, "dqbuf");
1971
1972 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1973 return -ERESTARTSYS;
1974
1975 for (;;) {
1976 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1977 if (ret < 0)
1978 goto out;
1979 if (ret > 0)
1980 break;
1981
1982 mutex_unlock(&gspca_dev->queue_lock);
1983
1984 if (file->f_flags & O_NONBLOCK)
1985 return -EAGAIN;
1986
1987 /* wait till a frame is ready */
1988 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1989 frame_ready(gspca_dev, file, v4l2_buf->memory),
1990 msecs_to_jiffies(3000));
1991 if (ret < 0)
1992 return ret;
1993 if (ret == 0)
1994 return -EIO;
1995
1996 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1997 return -ERESTARTSYS;
1998 }
1999
2000 i = gspca_dev->fr_o;
2001 j = gspca_dev->fr_queue[i];
2002 frame = &gspca_dev->frame[j];
2003
2004 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
2005
2006 if (gspca_dev->sd_desc->dq_callback) {
2007 mutex_lock(&gspca_dev->usb_lock);
2008 gspca_dev->usb_err = 0;
2009 if (gspca_dev->present)
2010 gspca_dev->sd_desc->dq_callback(gspca_dev);
2011 mutex_unlock(&gspca_dev->usb_lock);
2012 }
2013
2014 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
2015 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
2016 PDEBUG(D_FRAM, "dqbuf %d", j);
2017 ret = 0;
2018
2019 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
2020 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
2021 frame->data,
2022 frame->v4l2_buf.bytesused)) {
2023 PDEBUG(D_ERR|D_STREAM,
2024 "dqbuf cp to user failed");
2025 ret = -EFAULT;
2026 }
2027 }
2028 out:
2029 mutex_unlock(&gspca_dev->queue_lock);
2030 return ret;
2031 }
2032
2033 /*
2034 * queue a video buffer
2035 *
2036 * Attempting to queue a buffer that has already been
2037 * queued will return -EINVAL.
2038 */
2039 static int vidioc_qbuf(struct file *file, void *priv,
2040 struct v4l2_buffer *v4l2_buf)
2041 {
2042 struct gspca_dev *gspca_dev = priv;
2043 struct gspca_frame *frame;
2044 int i, index, ret;
2045
2046 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
2047
2048 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
2049 return -ERESTARTSYS;
2050
2051 index = v4l2_buf->index;
2052 if ((unsigned) index >= gspca_dev->nframes) {
2053 PDEBUG(D_FRAM,
2054 "qbuf idx %d >= %d", index, gspca_dev->nframes);
2055 ret = -EINVAL;
2056 goto out;
2057 }
2058 if (v4l2_buf->memory != gspca_dev->memory) {
2059 PDEBUG(D_FRAM, "qbuf bad memory type");
2060 ret = -EINVAL;
2061 goto out;
2062 }
2063
2064 frame = &gspca_dev->frame[index];
2065 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
2066 PDEBUG(D_FRAM, "qbuf bad state");
2067 ret = -EINVAL;
2068 goto out;
2069 }
2070
2071 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
2072
2073 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2074 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2075 frame->v4l2_buf.length = v4l2_buf->length;
2076 }
2077
2078 /* put the buffer in the 'queued' queue */
2079 i = atomic_read(&gspca_dev->fr_q);
2080 gspca_dev->fr_queue[i] = index;
2081 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
2082
2083 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2084 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2085 ret = 0;
2086 out:
2087 mutex_unlock(&gspca_dev->queue_lock);
2088 return ret;
2089 }
2090
2091 /*
2092 * allocate the resources for read()
2093 */
2094 static int read_alloc(struct gspca_dev *gspca_dev,
2095 struct file *file)
2096 {
2097 struct v4l2_buffer v4l2_buf;
2098 int i, ret;
2099
2100 PDEBUG(D_STREAM, "read alloc");
2101 if (gspca_dev->nframes == 0) {
2102 struct v4l2_requestbuffers rb;
2103
2104 memset(&rb, 0, sizeof rb);
2105 rb.count = gspca_dev->nbufread;
2106 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2107 rb.memory = GSPCA_MEMORY_READ;
2108 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2109 if (ret != 0) {
2110 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2111 return ret;
2112 }
2113 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2114 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2115 v4l2_buf.memory = GSPCA_MEMORY_READ;
2116 for (i = 0; i < gspca_dev->nbufread; i++) {
2117 v4l2_buf.index = i;
2118 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2119 if (ret != 0) {
2120 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2121 return ret;
2122 }
2123 }
2124 gspca_dev->memory = GSPCA_MEMORY_READ;
2125 }
2126
2127 /* start streaming */
2128 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2129 if (ret != 0)
2130 PDEBUG(D_STREAM, "read streamon err %d", ret);
2131 return ret;
2132 }
2133
2134 static unsigned int dev_poll(struct file *file, poll_table *wait)
2135 {
2136 struct gspca_dev *gspca_dev = file->private_data;
2137 int ret;
2138
2139 PDEBUG(D_FRAM, "poll");
2140
2141 poll_wait(file, &gspca_dev->wq, wait);
2142
2143 /* if reqbufs is not done, the user would use read() */
2144 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2145 ret = read_alloc(gspca_dev, file);
2146 if (ret != 0)
2147 return POLLERR;
2148 }
2149
2150 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2151 return POLLERR;
2152
2153 /* check if an image has been received */
2154 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2155 ret = POLLIN | POLLRDNORM; /* yes */
2156 else
2157 ret = 0;
2158 mutex_unlock(&gspca_dev->queue_lock);
2159 if (!gspca_dev->present)
2160 return POLLHUP;
2161 return ret;
2162 }
2163
2164 static ssize_t dev_read(struct file *file, char __user *data,
2165 size_t count, loff_t *ppos)
2166 {
2167 struct gspca_dev *gspca_dev = file->private_data;
2168 struct gspca_frame *frame;
2169 struct v4l2_buffer v4l2_buf;
2170 struct timeval timestamp;
2171 int n, ret, ret2;
2172
2173 PDEBUG(D_FRAM, "read (%zd)", count);
2174 if (!gspca_dev->present)
2175 return -ENODEV;
2176 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2177 ret = read_alloc(gspca_dev, file);
2178 if (ret != 0)
2179 return ret;
2180 }
2181
2182 /* get a frame */
2183 timestamp = ktime_to_timeval(ktime_get());
2184 timestamp.tv_sec--;
2185 n = 2;
2186 for (;;) {
2187 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2188 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2189 v4l2_buf.memory = GSPCA_MEMORY_READ;
2190 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2191 if (ret != 0) {
2192 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2193 return ret;
2194 }
2195
2196 /* if the process slept for more than 1 second,
2197 * get a newer frame */
2198 frame = &gspca_dev->frame[v4l2_buf.index];
2199 if (--n < 0)
2200 break; /* avoid infinite loop */
2201 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2202 break;
2203 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2204 if (ret != 0) {
2205 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2206 return ret;
2207 }
2208 }
2209
2210 /* copy the frame */
2211 if (count > frame->v4l2_buf.bytesused)
2212 count = frame->v4l2_buf.bytesused;
2213 ret = copy_to_user(data, frame->data, count);
2214 if (ret != 0) {
2215 PDEBUG(D_ERR|D_STREAM,
2216 "read cp to user lack %d / %zd", ret, count);
2217 ret = -EFAULT;
2218 goto out;
2219 }
2220 ret = count;
2221 out:
2222 /* in each case, requeue the buffer */
2223 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2224 if (ret2 != 0)
2225 return ret2;
2226 return ret;
2227 }
2228
2229 static struct v4l2_file_operations dev_fops = {
2230 .owner = THIS_MODULE,
2231 .open = dev_open,
2232 .release = dev_close,
2233 .read = dev_read,
2234 .mmap = dev_mmap,
2235 .unlocked_ioctl = video_ioctl2,
2236 .poll = dev_poll,
2237 };
2238
2239 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2240 .vidioc_querycap = vidioc_querycap,
2241 .vidioc_dqbuf = vidioc_dqbuf,
2242 .vidioc_qbuf = vidioc_qbuf,
2243 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2244 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2245 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2246 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2247 .vidioc_streamon = vidioc_streamon,
2248 .vidioc_queryctrl = vidioc_queryctrl,
2249 .vidioc_g_ctrl = vidioc_g_ctrl,
2250 .vidioc_s_ctrl = vidioc_s_ctrl,
2251 .vidioc_querymenu = vidioc_querymenu,
2252 .vidioc_enum_input = vidioc_enum_input,
2253 .vidioc_g_input = vidioc_g_input,
2254 .vidioc_s_input = vidioc_s_input,
2255 .vidioc_reqbufs = vidioc_reqbufs,
2256 .vidioc_querybuf = vidioc_querybuf,
2257 .vidioc_streamoff = vidioc_streamoff,
2258 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2259 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2260 .vidioc_g_parm = vidioc_g_parm,
2261 .vidioc_s_parm = vidioc_s_parm,
2262 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2263 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2264 #ifdef CONFIG_VIDEO_ADV_DEBUG
2265 .vidioc_g_register = vidioc_g_register,
2266 .vidioc_s_register = vidioc_s_register,
2267 #endif
2268 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2269 };
2270
2271 static const struct video_device gspca_template = {
2272 .name = "gspca main driver",
2273 .fops = &dev_fops,
2274 .ioctl_ops = &dev_ioctl_ops,
2275 .release = gspca_release,
2276 };
2277
2278 /* initialize the controls */
2279 static void ctrls_init(struct gspca_dev *gspca_dev)
2280 {
2281 struct gspca_ctrl *ctrl;
2282 int i;
2283
2284 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2285 i < gspca_dev->sd_desc->nctrls;
2286 i++, ctrl++) {
2287 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2288 ctrl->val = ctrl->def;
2289 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2290 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2291 }
2292 }
2293
2294 /*
2295 * probe and create a new gspca device
2296 *
2297 * This function must be called by the sub-driver when it is
2298 * called for probing a new device.
2299 */
2300 int gspca_dev_probe2(struct usb_interface *intf,
2301 const struct usb_device_id *id,
2302 const struct sd_desc *sd_desc,
2303 int dev_size,
2304 struct module *module)
2305 {
2306 struct gspca_dev *gspca_dev;
2307 struct usb_device *dev = interface_to_usbdev(intf);
2308 int ret;
2309
2310 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2311 sd_desc->name, id->idVendor, id->idProduct);
2312
2313 /* create the device */
2314 if (dev_size < sizeof *gspca_dev)
2315 dev_size = sizeof *gspca_dev;
2316 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2317 if (!gspca_dev) {
2318 pr_err("couldn't kzalloc gspca struct\n");
2319 return -ENOMEM;
2320 }
2321 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2322 if (!gspca_dev->usb_buf) {
2323 pr_err("out of memory\n");
2324 ret = -ENOMEM;
2325 goto out;
2326 }
2327 gspca_dev->dev = dev;
2328 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2329
2330 /* check if any audio device */
2331 if (dev->actconfig->desc.bNumInterfaces != 1) {
2332 int i;
2333 struct usb_interface *intf2;
2334
2335 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2336 intf2 = dev->actconfig->interface[i];
2337 if (intf2 != NULL
2338 && intf2->altsetting != NULL
2339 && intf2->altsetting->desc.bInterfaceClass ==
2340 USB_CLASS_AUDIO) {
2341 gspca_dev->audio = 1;
2342 break;
2343 }
2344 }
2345 }
2346
2347 gspca_dev->sd_desc = sd_desc;
2348 gspca_dev->nbufread = 2;
2349 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2350
2351 /* configure the subdriver and initialize the USB device */
2352 ret = sd_desc->config(gspca_dev, id);
2353 if (ret < 0)
2354 goto out;
2355 if (gspca_dev->cam.ctrls != NULL)
2356 ctrls_init(gspca_dev);
2357 ret = sd_desc->init(gspca_dev);
2358 if (ret < 0)
2359 goto out;
2360 gspca_set_default_mode(gspca_dev);
2361
2362 ret = gspca_input_connect(gspca_dev);
2363 if (ret)
2364 goto out;
2365
2366 mutex_init(&gspca_dev->usb_lock);
2367 mutex_init(&gspca_dev->queue_lock);
2368 init_waitqueue_head(&gspca_dev->wq);
2369
2370 /* init video stuff */
2371 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2372 gspca_dev->vdev.parent = &intf->dev;
2373 gspca_dev->module = module;
2374 gspca_dev->present = 1;
2375 ret = video_register_device(&gspca_dev->vdev,
2376 VFL_TYPE_GRABBER,
2377 -1);
2378 if (ret < 0) {
2379 pr_err("video_register_device err %d\n", ret);
2380 goto out;
2381 }
2382
2383 usb_set_intfdata(intf, gspca_dev);
2384 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2385
2386 gspca_input_create_urb(gspca_dev);
2387
2388 return 0;
2389 out:
2390 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2391 if (gspca_dev->input_dev)
2392 input_unregister_device(gspca_dev->input_dev);
2393 #endif
2394 kfree(gspca_dev->usb_buf);
2395 kfree(gspca_dev);
2396 return ret;
2397 }
2398 EXPORT_SYMBOL(gspca_dev_probe2);
2399
2400 /* same function as the previous one, but check the interface */
2401 int gspca_dev_probe(struct usb_interface *intf,
2402 const struct usb_device_id *id,
2403 const struct sd_desc *sd_desc,
2404 int dev_size,
2405 struct module *module)
2406 {
2407 struct usb_device *dev = interface_to_usbdev(intf);
2408
2409 /* we don't handle multi-config cameras */
2410 if (dev->descriptor.bNumConfigurations != 1) {
2411 pr_err("%04x:%04x too many config\n",
2412 id->idVendor, id->idProduct);
2413 return -ENODEV;
2414 }
2415
2416 /* the USB video interface must be the first one */
2417 if (dev->actconfig->desc.bNumInterfaces != 1
2418 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2419 return -ENODEV;
2420
2421 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2422 }
2423 EXPORT_SYMBOL(gspca_dev_probe);
2424
2425 /*
2426 * USB disconnection
2427 *
2428 * This function must be called by the sub-driver
2429 * when the device disconnects, after the specific resources are freed.
2430 */
2431 void gspca_disconnect(struct usb_interface *intf)
2432 {
2433 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2434 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2435 struct input_dev *input_dev;
2436 #endif
2437
2438 PDEBUG(D_PROBE, "%s disconnect",
2439 video_device_node_name(&gspca_dev->vdev));
2440 mutex_lock(&gspca_dev->usb_lock);
2441
2442 gspca_dev->present = 0;
2443 wake_up_interruptible(&gspca_dev->wq);
2444
2445 destroy_urbs(gspca_dev);
2446
2447 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2448 gspca_input_destroy_urb(gspca_dev);
2449 input_dev = gspca_dev->input_dev;
2450 if (input_dev) {
2451 gspca_dev->input_dev = NULL;
2452 input_unregister_device(input_dev);
2453 }
2454 #endif
2455
2456 /* the device is freed at exit of this function */
2457 gspca_dev->dev = NULL;
2458 mutex_unlock(&gspca_dev->usb_lock);
2459
2460 usb_set_intfdata(intf, NULL);
2461
2462 /* release the device */
2463 /* (this will call gspca_release() immediately or on last close) */
2464 video_unregister_device(&gspca_dev->vdev);
2465
2466 /* PDEBUG(D_PROBE, "disconnect complete"); */
2467 }
2468 EXPORT_SYMBOL(gspca_disconnect);
2469
2470 #ifdef CONFIG_PM
2471 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2472 {
2473 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2474
2475 if (!gspca_dev->streaming)
2476 return 0;
2477 gspca_dev->frozen = 1; /* avoid urb error messages */
2478 if (gspca_dev->sd_desc->stopN)
2479 gspca_dev->sd_desc->stopN(gspca_dev);
2480 destroy_urbs(gspca_dev);
2481 gspca_input_destroy_urb(gspca_dev);
2482 gspca_set_alt0(gspca_dev);
2483 if (gspca_dev->sd_desc->stop0)
2484 gspca_dev->sd_desc->stop0(gspca_dev);
2485 return 0;
2486 }
2487 EXPORT_SYMBOL(gspca_suspend);
2488
2489 int gspca_resume(struct usb_interface *intf)
2490 {
2491 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2492
2493 gspca_dev->frozen = 0;
2494 gspca_dev->sd_desc->init(gspca_dev);
2495 gspca_input_create_urb(gspca_dev);
2496 if (gspca_dev->streaming)
2497 return gspca_init_transfer(gspca_dev);
2498 return 0;
2499 }
2500 EXPORT_SYMBOL(gspca_resume);
2501 #endif
2502 /* -- cam driver utility functions -- */
2503
2504 /* auto gain and exposure algorithm based on the knee algorithm described here:
2505 http://ytse.tricolour.net/docs/LowLightOptimization.html
2506
2507 Returns 0 if no changes were made, 1 if the gain and or exposure settings
2508 where changed. */
2509 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2510 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2511 {
2512 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2513 const struct ctrl *gain_ctrl = NULL;
2514 const struct ctrl *exposure_ctrl = NULL;
2515 const struct ctrl *autogain_ctrl = NULL;
2516 int retval = 0;
2517
2518 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2519 if (gspca_dev->ctrl_dis & (1 << i))
2520 continue;
2521 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2522 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2523 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2524 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2525 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2526 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2527 }
2528 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2529 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2530 "on cam without (auto)gain/exposure");
2531 return 0;
2532 }
2533
2534 if (gain_ctrl->get(gspca_dev, &gain) ||
2535 exposure_ctrl->get(gspca_dev, &exposure) ||
2536 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2537 return 0;
2538
2539 orig_gain = gain;
2540 orig_exposure = exposure;
2541
2542 /* If we are of a multiple of deadzone, do multiple steps to reach the
2543 desired lumination fast (with the risc of a slight overshoot) */
2544 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2545
2546 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2547 avg_lum, desired_avg_lum, steps);
2548
2549 for (i = 0; i < steps; i++) {
2550 if (avg_lum > desired_avg_lum) {
2551 if (gain > gain_knee)
2552 gain--;
2553 else if (exposure > exposure_knee)
2554 exposure--;
2555 else if (gain > gain_ctrl->qctrl.default_value)
2556 gain--;
2557 else if (exposure > exposure_ctrl->qctrl.minimum)
2558 exposure--;
2559 else if (gain > gain_ctrl->qctrl.minimum)
2560 gain--;
2561 else
2562 break;
2563 } else {
2564 if (gain < gain_ctrl->qctrl.default_value)
2565 gain++;
2566 else if (exposure < exposure_knee)
2567 exposure++;
2568 else if (gain < gain_knee)
2569 gain++;
2570 else if (exposure < exposure_ctrl->qctrl.maximum)
2571 exposure++;
2572 else if (gain < gain_ctrl->qctrl.maximum)
2573 gain++;
2574 else
2575 break;
2576 }
2577 }
2578
2579 if (gain != orig_gain) {
2580 gain_ctrl->set(gspca_dev, gain);
2581 retval = 1;
2582 }
2583 if (exposure != orig_exposure) {
2584 exposure_ctrl->set(gspca_dev, exposure);
2585 retval = 1;
2586 }
2587
2588 return retval;
2589 }
2590 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2591
2592 /* -- module insert / remove -- */
2593 static int __init gspca_init(void)
2594 {
2595 pr_info("v" GSPCA_VERSION " registered\n");
2596 return 0;
2597 }
2598 static void __exit gspca_exit(void)
2599 {
2600 }
2601
2602 module_init(gspca_init);
2603 module_exit(gspca_exit);
2604
2605 #ifdef GSPCA_DEBUG
2606 module_param_named(debug, gspca_debug, int, 0644);
2607 MODULE_PARM_DESC(debug,
2608 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2609 " 0x08:stream 0x10:frame 0x20:packet"
2610 " 0x0100: v4l2");
2611 #endif
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