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[media] v4l2: make vidioc_s_jpegcomp const
[deliverable/linux.git] / drivers / media / usb / 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 #include <media/v4l2-ctrls.h>
42 #include <media/v4l2-fh.h>
43 #include <media/v4l2-event.h>
44
45 #include "gspca.h"
46
47 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
48 #include <linux/input.h>
49 #include <linux/usb/input.h>
50 #endif
51
52 /* global values */
53 #define DEF_NURBS 3 /* default number of URBs */
54 #if DEF_NURBS > MAX_NURBS
55 #error "DEF_NURBS too big"
56 #endif
57
58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
59 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
60 MODULE_LICENSE("GPL");
61 MODULE_VERSION(GSPCA_VERSION);
62
63 #ifdef GSPCA_DEBUG
64 int gspca_debug = D_ERR | D_PROBE;
65 EXPORT_SYMBOL(gspca_debug);
66
67 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
68 {
69 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
70 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
71 txt,
72 pixfmt & 0xff,
73 (pixfmt >> 8) & 0xff,
74 (pixfmt >> 16) & 0xff,
75 pixfmt >> 24,
76 w, h);
77 } else {
78 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
79 txt,
80 pixfmt,
81 w, h);
82 }
83 }
84 #else
85 #define PDEBUG_MODE(txt, pixfmt, w, h)
86 #endif
87
88 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
89 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
90 #define GSPCA_MEMORY_READ 7
91
92 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
93
94 /*
95 * VMA operations.
96 */
97 static void gspca_vm_open(struct vm_area_struct *vma)
98 {
99 struct gspca_frame *frame = vma->vm_private_data;
100
101 frame->vma_use_count++;
102 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
103 }
104
105 static void gspca_vm_close(struct vm_area_struct *vma)
106 {
107 struct gspca_frame *frame = vma->vm_private_data;
108
109 if (--frame->vma_use_count <= 0)
110 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
111 }
112
113 static const struct vm_operations_struct gspca_vm_ops = {
114 .open = gspca_vm_open,
115 .close = gspca_vm_close,
116 };
117
118 /*
119 * Input and interrupt endpoint handling functions
120 */
121 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
122 static void int_irq(struct urb *urb)
123 {
124 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
125 int ret;
126
127 ret = urb->status;
128 switch (ret) {
129 case 0:
130 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
131 urb->transfer_buffer, urb->actual_length) < 0) {
132 PDEBUG(D_ERR, "Unknown packet received");
133 }
134 break;
135
136 case -ENOENT:
137 case -ECONNRESET:
138 case -ENODEV:
139 case -ESHUTDOWN:
140 /* Stop is requested either by software or hardware is gone,
141 * keep the ret value non-zero and don't resubmit later.
142 */
143 break;
144
145 default:
146 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
147 urb->status = 0;
148 ret = 0;
149 }
150
151 if (ret == 0) {
152 ret = usb_submit_urb(urb, GFP_ATOMIC);
153 if (ret < 0)
154 pr_err("Resubmit URB failed with error %i\n", ret);
155 }
156 }
157
158 static int gspca_input_connect(struct gspca_dev *dev)
159 {
160 struct input_dev *input_dev;
161 int err = 0;
162
163 dev->input_dev = NULL;
164 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
165 input_dev = input_allocate_device();
166 if (!input_dev)
167 return -ENOMEM;
168
169 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
170 strlcat(dev->phys, "/input0", sizeof(dev->phys));
171
172 input_dev->name = dev->sd_desc->name;
173 input_dev->phys = dev->phys;
174
175 usb_to_input_id(dev->dev, &input_dev->id);
176
177 input_dev->evbit[0] = BIT_MASK(EV_KEY);
178 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
179 input_dev->dev.parent = &dev->dev->dev;
180
181 err = input_register_device(input_dev);
182 if (err) {
183 pr_err("Input device registration failed with error %i\n",
184 err);
185 input_dev->dev.parent = NULL;
186 input_free_device(input_dev);
187 } else {
188 dev->input_dev = input_dev;
189 }
190 }
191
192 return err;
193 }
194
195 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
196 struct usb_endpoint_descriptor *ep)
197 {
198 unsigned int buffer_len;
199 int interval;
200 struct urb *urb;
201 struct usb_device *dev;
202 void *buffer = NULL;
203 int ret = -EINVAL;
204
205 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
206 interval = ep->bInterval;
207 PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
208 "buffer_len=%u, interval=%u",
209 ep->bEndpointAddress, buffer_len, interval);
210
211 dev = gspca_dev->dev;
212
213 urb = usb_alloc_urb(0, GFP_KERNEL);
214 if (!urb) {
215 ret = -ENOMEM;
216 goto error;
217 }
218
219 buffer = usb_alloc_coherent(dev, buffer_len,
220 GFP_KERNEL, &urb->transfer_dma);
221 if (!buffer) {
222 ret = -ENOMEM;
223 goto error_buffer;
224 }
225 usb_fill_int_urb(urb, dev,
226 usb_rcvintpipe(dev, ep->bEndpointAddress),
227 buffer, buffer_len,
228 int_irq, (void *)gspca_dev, interval);
229 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
230 ret = usb_submit_urb(urb, GFP_KERNEL);
231 if (ret < 0) {
232 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
233 goto error_submit;
234 }
235 gspca_dev->int_urb = urb;
236 return ret;
237
238 error_submit:
239 usb_free_coherent(dev,
240 urb->transfer_buffer_length,
241 urb->transfer_buffer,
242 urb->transfer_dma);
243 error_buffer:
244 usb_free_urb(urb);
245 error:
246 return ret;
247 }
248
249 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
250 {
251 struct usb_interface *intf;
252 struct usb_host_interface *intf_desc;
253 struct usb_endpoint_descriptor *ep;
254 int i;
255
256 if (gspca_dev->sd_desc->int_pkt_scan) {
257 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
258 intf_desc = intf->cur_altsetting;
259 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
260 ep = &intf_desc->endpoint[i].desc;
261 if (usb_endpoint_dir_in(ep) &&
262 usb_endpoint_xfer_int(ep)) {
263
264 alloc_and_submit_int_urb(gspca_dev, ep);
265 break;
266 }
267 }
268 }
269 }
270
271 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
272 {
273 struct urb *urb;
274
275 urb = gspca_dev->int_urb;
276 if (urb) {
277 gspca_dev->int_urb = NULL;
278 usb_kill_urb(urb);
279 usb_free_coherent(gspca_dev->dev,
280 urb->transfer_buffer_length,
281 urb->transfer_buffer,
282 urb->transfer_dma);
283 usb_free_urb(urb);
284 }
285 }
286 #else
287 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
288 {
289 }
290
291 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
292 {
293 }
294
295 static inline int gspca_input_connect(struct gspca_dev *dev)
296 {
297 return 0;
298 }
299 #endif
300
301 /*
302 * fill a video frame from an URB and resubmit
303 */
304 static void fill_frame(struct gspca_dev *gspca_dev,
305 struct urb *urb)
306 {
307 u8 *data; /* address of data in the iso message */
308 int i, len, st;
309 cam_pkt_op pkt_scan;
310
311 if (urb->status != 0) {
312 if (urb->status == -ESHUTDOWN)
313 return; /* disconnection */
314 #ifdef CONFIG_PM
315 if (gspca_dev->frozen)
316 return;
317 #endif
318 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
319 urb->status = 0;
320 goto resubmit;
321 }
322 pkt_scan = gspca_dev->sd_desc->pkt_scan;
323 for (i = 0; i < urb->number_of_packets; i++) {
324 len = urb->iso_frame_desc[i].actual_length;
325
326 /* check the packet status and length */
327 st = urb->iso_frame_desc[i].status;
328 if (st) {
329 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
330 i, len, st);
331 gspca_dev->last_packet_type = DISCARD_PACKET;
332 continue;
333 }
334 if (len == 0) {
335 if (gspca_dev->empty_packet == 0)
336 gspca_dev->empty_packet = 1;
337 continue;
338 }
339
340 /* let the packet be analyzed by the subdriver */
341 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
342 i, urb->iso_frame_desc[i].offset, len);
343 data = (u8 *) urb->transfer_buffer
344 + urb->iso_frame_desc[i].offset;
345 pkt_scan(gspca_dev, data, len);
346 }
347
348 resubmit:
349 /* resubmit the URB */
350 st = usb_submit_urb(urb, GFP_ATOMIC);
351 if (st < 0)
352 pr_err("usb_submit_urb() ret %d\n", st);
353 }
354
355 /*
356 * ISOC message interrupt from the USB device
357 *
358 * Analyse each packet and call the subdriver for copy to the frame buffer.
359 */
360 static void isoc_irq(struct urb *urb)
361 {
362 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
363
364 PDEBUG(D_PACK, "isoc irq");
365 if (!gspca_dev->streaming)
366 return;
367 fill_frame(gspca_dev, urb);
368 }
369
370 /*
371 * bulk message interrupt from the USB device
372 */
373 static void bulk_irq(struct urb *urb)
374 {
375 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
376 int st;
377
378 PDEBUG(D_PACK, "bulk irq");
379 if (!gspca_dev->streaming)
380 return;
381 switch (urb->status) {
382 case 0:
383 break;
384 case -ESHUTDOWN:
385 return; /* disconnection */
386 default:
387 #ifdef CONFIG_PM
388 if (gspca_dev->frozen)
389 return;
390 #endif
391 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
392 urb->status = 0;
393 goto resubmit;
394 }
395
396 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
397 gspca_dev->sd_desc->pkt_scan(gspca_dev,
398 urb->transfer_buffer,
399 urb->actual_length);
400
401 resubmit:
402 /* resubmit the URB */
403 if (gspca_dev->cam.bulk_nurbs != 0) {
404 st = usb_submit_urb(urb, GFP_ATOMIC);
405 if (st < 0)
406 pr_err("usb_submit_urb() ret %d\n", st);
407 }
408 }
409
410 /*
411 * add data to the current frame
412 *
413 * This function is called by the subdrivers at interrupt level.
414 *
415 * To build a frame, these ones must add
416 * - one FIRST_PACKET
417 * - 0 or many INTER_PACKETs
418 * - one LAST_PACKET
419 * DISCARD_PACKET invalidates the whole frame.
420 */
421 void gspca_frame_add(struct gspca_dev *gspca_dev,
422 enum gspca_packet_type packet_type,
423 const u8 *data,
424 int len)
425 {
426 struct gspca_frame *frame;
427 int i, j;
428
429 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
430
431 if (packet_type == FIRST_PACKET) {
432 i = atomic_read(&gspca_dev->fr_i);
433
434 /* if there are no queued buffer, discard the whole frame */
435 if (i == atomic_read(&gspca_dev->fr_q)) {
436 gspca_dev->last_packet_type = DISCARD_PACKET;
437 gspca_dev->sequence++;
438 return;
439 }
440 j = gspca_dev->fr_queue[i];
441 frame = &gspca_dev->frame[j];
442 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
443 frame->v4l2_buf.sequence = gspca_dev->sequence++;
444 gspca_dev->image = frame->data;
445 gspca_dev->image_len = 0;
446 } else {
447 switch (gspca_dev->last_packet_type) {
448 case DISCARD_PACKET:
449 if (packet_type == LAST_PACKET) {
450 gspca_dev->last_packet_type = packet_type;
451 gspca_dev->image = NULL;
452 gspca_dev->image_len = 0;
453 }
454 return;
455 case LAST_PACKET:
456 return;
457 }
458 }
459
460 /* append the packet to the frame buffer */
461 if (len > 0) {
462 if (gspca_dev->image_len + len > gspca_dev->frsz) {
463 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
464 gspca_dev->image_len + len,
465 gspca_dev->frsz);
466 packet_type = DISCARD_PACKET;
467 } else {
468 /* !! image is NULL only when last pkt is LAST or DISCARD
469 if (gspca_dev->image == NULL) {
470 pr_err("gspca_frame_add() image == NULL\n");
471 return;
472 }
473 */
474 memcpy(gspca_dev->image + gspca_dev->image_len,
475 data, len);
476 gspca_dev->image_len += len;
477 }
478 }
479 gspca_dev->last_packet_type = packet_type;
480
481 /* if last packet, invalidate packet concatenation until
482 * next first packet, wake up the application and advance
483 * in the queue */
484 if (packet_type == LAST_PACKET) {
485 i = atomic_read(&gspca_dev->fr_i);
486 j = gspca_dev->fr_queue[i];
487 frame = &gspca_dev->frame[j];
488 frame->v4l2_buf.bytesused = gspca_dev->image_len;
489 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
490 | V4L2_BUF_FLAG_DONE)
491 & ~V4L2_BUF_FLAG_QUEUED;
492 i = (i + 1) % GSPCA_MAX_FRAMES;
493 atomic_set(&gspca_dev->fr_i, i);
494 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
495 PDEBUG(D_FRAM, "frame complete len:%d",
496 frame->v4l2_buf.bytesused);
497 gspca_dev->image = NULL;
498 gspca_dev->image_len = 0;
499 }
500 }
501 EXPORT_SYMBOL(gspca_frame_add);
502
503 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
504 enum v4l2_memory memory, unsigned int count)
505 {
506 struct gspca_frame *frame;
507 unsigned int frsz;
508 int i;
509
510 i = gspca_dev->curr_mode;
511 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
512 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
513 frsz = PAGE_ALIGN(frsz);
514 if (count >= GSPCA_MAX_FRAMES)
515 count = GSPCA_MAX_FRAMES - 1;
516 gspca_dev->frbuf = vmalloc_32(frsz * count);
517 if (!gspca_dev->frbuf) {
518 pr_err("frame alloc failed\n");
519 return -ENOMEM;
520 }
521 gspca_dev->capt_file = file;
522 gspca_dev->memory = memory;
523 gspca_dev->frsz = frsz;
524 gspca_dev->nframes = count;
525 for (i = 0; i < count; i++) {
526 frame = &gspca_dev->frame[i];
527 frame->v4l2_buf.index = i;
528 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
529 frame->v4l2_buf.flags = 0;
530 frame->v4l2_buf.field = V4L2_FIELD_NONE;
531 frame->v4l2_buf.length = frsz;
532 frame->v4l2_buf.memory = memory;
533 frame->v4l2_buf.sequence = 0;
534 frame->data = gspca_dev->frbuf + i * frsz;
535 frame->v4l2_buf.m.offset = i * frsz;
536 }
537 atomic_set(&gspca_dev->fr_q, 0);
538 atomic_set(&gspca_dev->fr_i, 0);
539 gspca_dev->fr_o = 0;
540 return 0;
541 }
542
543 static void frame_free(struct gspca_dev *gspca_dev)
544 {
545 int i;
546
547 PDEBUG(D_STREAM, "frame free");
548 if (gspca_dev->frbuf != NULL) {
549 vfree(gspca_dev->frbuf);
550 gspca_dev->frbuf = NULL;
551 for (i = 0; i < gspca_dev->nframes; i++)
552 gspca_dev->frame[i].data = NULL;
553 }
554 gspca_dev->nframes = 0;
555 gspca_dev->frsz = 0;
556 gspca_dev->capt_file = NULL;
557 gspca_dev->memory = GSPCA_MEMORY_NO;
558 }
559
560 static void destroy_urbs(struct gspca_dev *gspca_dev)
561 {
562 struct urb *urb;
563 unsigned int i;
564
565 PDEBUG(D_STREAM, "kill transfer");
566 for (i = 0; i < MAX_NURBS; i++) {
567 urb = gspca_dev->urb[i];
568 if (urb == NULL)
569 break;
570
571 gspca_dev->urb[i] = NULL;
572 usb_kill_urb(urb);
573 if (urb->transfer_buffer != NULL)
574 usb_free_coherent(gspca_dev->dev,
575 urb->transfer_buffer_length,
576 urb->transfer_buffer,
577 urb->transfer_dma);
578 usb_free_urb(urb);
579 }
580 }
581
582 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
583 {
584 int ret;
585
586 if (gspca_dev->alt == 0)
587 return 0;
588 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
589 if (ret < 0)
590 pr_err("set alt 0 err %d\n", ret);
591 return ret;
592 }
593
594 /* Note: both the queue and the usb locks should be held when calling this */
595 static void gspca_stream_off(struct gspca_dev *gspca_dev)
596 {
597 gspca_dev->streaming = 0;
598 gspca_dev->usb_err = 0;
599 if (gspca_dev->sd_desc->stopN)
600 gspca_dev->sd_desc->stopN(gspca_dev);
601 destroy_urbs(gspca_dev);
602 gspca_input_destroy_urb(gspca_dev);
603 gspca_set_alt0(gspca_dev);
604 gspca_input_create_urb(gspca_dev);
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 /* reset the streaming variables */
851 gspca_dev->image = NULL;
852 gspca_dev->image_len = 0;
853 gspca_dev->last_packet_type = DISCARD_PACKET;
854 gspca_dev->sequence = 0;
855
856 gspca_dev->usb_err = 0;
857
858 /* do the specific subdriver stuff before endpoint selection */
859 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
860 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
861 if (gspca_dev->sd_desc->isoc_init) {
862 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
863 if (ret < 0)
864 return ret;
865 }
866 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
867 : USB_ENDPOINT_XFER_ISOC;
868
869 /* if bulk or the subdriver forced an altsetting, get the endpoint */
870 if (gspca_dev->alt != 0) {
871 gspca_dev->alt--; /* (previous version compatibility) */
872 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
873 if (ep == NULL) {
874 pr_err("bad altsetting %d\n", gspca_dev->alt);
875 return -EIO;
876 }
877 ep_tb[0].alt = gspca_dev->alt;
878 alt_idx = 1;
879 } else {
880
881 /* else, compute the minimum bandwidth
882 * and build the endpoint table */
883 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
884 if (alt_idx <= 0) {
885 pr_err("no transfer endpoint found\n");
886 return -EIO;
887 }
888 }
889
890 /* set the highest alternate setting and
891 * loop until urb submit succeeds */
892 gspca_input_destroy_urb(gspca_dev);
893
894 gspca_dev->alt = ep_tb[--alt_idx].alt;
895 alt = -1;
896 for (;;) {
897 if (alt != gspca_dev->alt) {
898 alt = gspca_dev->alt;
899 if (intf->num_altsetting > 1) {
900 ret = usb_set_interface(gspca_dev->dev,
901 gspca_dev->iface,
902 alt);
903 if (ret < 0) {
904 if (ret == -ENOSPC)
905 goto retry; /*fixme: ugly*/
906 pr_err("set alt %d err %d\n", alt, ret);
907 goto out;
908 }
909 }
910 }
911 if (!gspca_dev->cam.no_urb_create) {
912 PDEBUG(D_STREAM, "init transfer alt %d", alt);
913 ret = create_urbs(gspca_dev,
914 alt_xfer(&intf->altsetting[alt], xfer));
915 if (ret < 0) {
916 destroy_urbs(gspca_dev);
917 goto out;
918 }
919 }
920
921 /* clear the bulk endpoint */
922 if (gspca_dev->cam.bulk)
923 usb_clear_halt(gspca_dev->dev,
924 gspca_dev->urb[0]->pipe);
925
926 /* start the cam */
927 ret = gspca_dev->sd_desc->start(gspca_dev);
928 if (ret < 0) {
929 destroy_urbs(gspca_dev);
930 goto out;
931 }
932 gspca_dev->streaming = 1;
933 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
934
935 /* some bulk transfers are started by the subdriver */
936 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
937 break;
938
939 /* submit the URBs */
940 for (n = 0; n < MAX_NURBS; n++) {
941 urb = gspca_dev->urb[n];
942 if (urb == NULL)
943 break;
944 ret = usb_submit_urb(urb, GFP_KERNEL);
945 if (ret < 0)
946 break;
947 }
948 if (ret >= 0)
949 break; /* transfer is started */
950
951 /* something when wrong
952 * stop the webcam and free the transfer resources */
953 gspca_stream_off(gspca_dev);
954 if (ret != -ENOSPC) {
955 pr_err("usb_submit_urb alt %d err %d\n",
956 gspca_dev->alt, ret);
957 goto out;
958 }
959
960 /* the bandwidth is not wide enough
961 * negotiate or try a lower alternate setting */
962 retry:
963 PDEBUG(D_ERR|D_STREAM,
964 "alt %d - bandwidth not wide enough - trying again",
965 alt);
966 msleep(20); /* wait for kill complete */
967 if (gspca_dev->sd_desc->isoc_nego) {
968 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
969 if (ret < 0)
970 goto out;
971 } else {
972 if (alt_idx <= 0) {
973 pr_err("no transfer endpoint found\n");
974 ret = -EIO;
975 goto out;
976 }
977 gspca_dev->alt = ep_tb[--alt_idx].alt;
978 }
979 }
980 out:
981 gspca_input_create_urb(gspca_dev);
982 return ret;
983 }
984
985 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
986 {
987 struct gspca_ctrl *ctrl;
988 int i;
989
990 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
991 gspca_dev->curr_mode = i;
992 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
993 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
994 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
995
996 /* set the current control values to their default values
997 * which may have changed in sd_init() */
998 /* does nothing if ctrl_handler == NULL */
999 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
1000 ctrl = gspca_dev->cam.ctrls;
1001 if (ctrl != NULL) {
1002 for (i = 0;
1003 i < gspca_dev->sd_desc->nctrls;
1004 i++, ctrl++)
1005 ctrl->val = ctrl->def;
1006 }
1007 }
1008
1009 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1010 int width, int height)
1011 {
1012 int i;
1013
1014 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1015 if (width >= gspca_dev->cam.cam_mode[i].width
1016 && height >= gspca_dev->cam.cam_mode[i].height)
1017 break;
1018 }
1019 return i;
1020 }
1021
1022 /*
1023 * search a mode with the right pixel format
1024 */
1025 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1026 int mode,
1027 int pixfmt)
1028 {
1029 int modeU, modeD;
1030
1031 modeU = modeD = mode;
1032 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1033 if (--modeD >= 0) {
1034 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1035 == pixfmt)
1036 return modeD;
1037 }
1038 if (++modeU < gspca_dev->cam.nmodes) {
1039 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1040 == pixfmt)
1041 return modeU;
1042 }
1043 }
1044 return -EINVAL;
1045 }
1046
1047 #ifdef CONFIG_VIDEO_ADV_DEBUG
1048 static int vidioc_g_register(struct file *file, void *priv,
1049 struct v4l2_dbg_register *reg)
1050 {
1051 struct gspca_dev *gspca_dev = video_drvdata(file);
1052
1053 gspca_dev->usb_err = 0;
1054 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1055 }
1056
1057 static int vidioc_s_register(struct file *file, void *priv,
1058 struct v4l2_dbg_register *reg)
1059 {
1060 struct gspca_dev *gspca_dev = video_drvdata(file);
1061
1062 gspca_dev->usb_err = 0;
1063 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1064 }
1065 #endif
1066
1067 static int vidioc_g_chip_ident(struct file *file, void *priv,
1068 struct v4l2_dbg_chip_ident *chip)
1069 {
1070 struct gspca_dev *gspca_dev = video_drvdata(file);
1071
1072 gspca_dev->usb_err = 0;
1073 return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1074 }
1075
1076 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1077 struct v4l2_fmtdesc *fmtdesc)
1078 {
1079 struct gspca_dev *gspca_dev = video_drvdata(file);
1080 int i, j, index;
1081 __u32 fmt_tb[8];
1082
1083 /* give an index to each format */
1084 index = 0;
1085 j = 0;
1086 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1087 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1088 j = 0;
1089 for (;;) {
1090 if (fmt_tb[j] == fmt_tb[index])
1091 break;
1092 j++;
1093 }
1094 if (j == index) {
1095 if (fmtdesc->index == index)
1096 break; /* new format */
1097 index++;
1098 if (index >= ARRAY_SIZE(fmt_tb))
1099 return -EINVAL;
1100 }
1101 }
1102 if (i < 0)
1103 return -EINVAL; /* no more format */
1104
1105 fmtdesc->pixelformat = fmt_tb[index];
1106 if (gspca_dev->cam.cam_mode[i].sizeimage <
1107 gspca_dev->cam.cam_mode[i].width *
1108 gspca_dev->cam.cam_mode[i].height)
1109 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1110 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1111 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1112 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1113 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1114 fmtdesc->description[4] = '\0';
1115 return 0;
1116 }
1117
1118 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1119 struct v4l2_format *fmt)
1120 {
1121 struct gspca_dev *gspca_dev = video_drvdata(file);
1122 int mode;
1123
1124 mode = gspca_dev->curr_mode;
1125 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1126 /* some drivers use priv internally, zero it before giving it to
1127 userspace */
1128 fmt->fmt.pix.priv = 0;
1129 return 0;
1130 }
1131
1132 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1133 struct v4l2_format *fmt)
1134 {
1135 int w, h, mode, mode2;
1136
1137 w = fmt->fmt.pix.width;
1138 h = fmt->fmt.pix.height;
1139
1140 #ifdef GSPCA_DEBUG
1141 if (gspca_debug & D_CONF)
1142 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1143 #endif
1144 /* search the closest mode for width and height */
1145 mode = wxh_to_mode(gspca_dev, w, h);
1146
1147 /* OK if right palette */
1148 if (gspca_dev->cam.cam_mode[mode].pixelformat
1149 != fmt->fmt.pix.pixelformat) {
1150
1151 /* else, search the closest mode with the same pixel format */
1152 mode2 = gspca_get_mode(gspca_dev, mode,
1153 fmt->fmt.pix.pixelformat);
1154 if (mode2 >= 0)
1155 mode = mode2;
1156 /* else
1157 ; * no chance, return this mode */
1158 }
1159 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1160 /* some drivers use priv internally, zero it before giving it to
1161 userspace */
1162 fmt->fmt.pix.priv = 0;
1163 return mode; /* used when s_fmt */
1164 }
1165
1166 static int vidioc_try_fmt_vid_cap(struct file *file,
1167 void *priv,
1168 struct v4l2_format *fmt)
1169 {
1170 struct gspca_dev *gspca_dev = video_drvdata(file);
1171 int ret;
1172
1173 ret = try_fmt_vid_cap(gspca_dev, fmt);
1174 if (ret < 0)
1175 return ret;
1176 return 0;
1177 }
1178
1179 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1180 struct v4l2_format *fmt)
1181 {
1182 struct gspca_dev *gspca_dev = video_drvdata(file);
1183 int ret;
1184
1185 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1186 return -ERESTARTSYS;
1187
1188 ret = try_fmt_vid_cap(gspca_dev, fmt);
1189 if (ret < 0)
1190 goto out;
1191
1192 if (gspca_dev->nframes != 0
1193 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1194 ret = -EINVAL;
1195 goto out;
1196 }
1197
1198 if (ret == gspca_dev->curr_mode) {
1199 ret = 0;
1200 goto out; /* same mode */
1201 }
1202
1203 if (gspca_dev->streaming) {
1204 ret = -EBUSY;
1205 goto out;
1206 }
1207 gspca_dev->width = fmt->fmt.pix.width;
1208 gspca_dev->height = fmt->fmt.pix.height;
1209 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1210 gspca_dev->curr_mode = ret;
1211
1212 ret = 0;
1213 out:
1214 mutex_unlock(&gspca_dev->queue_lock);
1215 return ret;
1216 }
1217
1218 static int vidioc_enum_framesizes(struct file *file, void *priv,
1219 struct v4l2_frmsizeenum *fsize)
1220 {
1221 struct gspca_dev *gspca_dev = video_drvdata(file);
1222 int i;
1223 __u32 index = 0;
1224
1225 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1226 if (fsize->pixel_format !=
1227 gspca_dev->cam.cam_mode[i].pixelformat)
1228 continue;
1229
1230 if (fsize->index == index) {
1231 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1232 fsize->discrete.width =
1233 gspca_dev->cam.cam_mode[i].width;
1234 fsize->discrete.height =
1235 gspca_dev->cam.cam_mode[i].height;
1236 return 0;
1237 }
1238 index++;
1239 }
1240
1241 return -EINVAL;
1242 }
1243
1244 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1245 struct v4l2_frmivalenum *fival)
1246 {
1247 struct gspca_dev *gspca_dev = video_drvdata(filp);
1248 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1249 __u32 i;
1250
1251 if (gspca_dev->cam.mode_framerates == NULL ||
1252 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1253 return -EINVAL;
1254
1255 if (fival->pixel_format !=
1256 gspca_dev->cam.cam_mode[mode].pixelformat)
1257 return -EINVAL;
1258
1259 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1260 if (fival->index == i) {
1261 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1262 fival->discrete.numerator = 1;
1263 fival->discrete.denominator =
1264 gspca_dev->cam.mode_framerates[mode].rates[i];
1265 return 0;
1266 }
1267 }
1268
1269 return -EINVAL;
1270 }
1271
1272 static void gspca_release(struct v4l2_device *v4l2_device)
1273 {
1274 struct gspca_dev *gspca_dev =
1275 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1276
1277 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1278 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1279 kfree(gspca_dev->usb_buf);
1280 kfree(gspca_dev);
1281 }
1282
1283 static int dev_open(struct file *file)
1284 {
1285 struct gspca_dev *gspca_dev = video_drvdata(file);
1286
1287 PDEBUG(D_STREAM, "[%s] open", current->comm);
1288
1289 /* protect the subdriver against rmmod */
1290 if (!try_module_get(gspca_dev->module))
1291 return -ENODEV;
1292
1293 #ifdef GSPCA_DEBUG
1294 /* activate the v4l2 debug */
1295 if (gspca_debug & D_V4L2)
1296 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1297 | V4L2_DEBUG_IOCTL_ARG;
1298 else
1299 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1300 | V4L2_DEBUG_IOCTL_ARG);
1301 #endif
1302 return v4l2_fh_open(file);
1303 }
1304
1305 static int dev_close(struct file *file)
1306 {
1307 struct gspca_dev *gspca_dev = video_drvdata(file);
1308
1309 PDEBUG(D_STREAM, "[%s] close", current->comm);
1310
1311 /* Needed for gspca_stream_off, always lock before queue_lock! */
1312 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1313 return -ERESTARTSYS;
1314
1315 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1316 mutex_unlock(&gspca_dev->usb_lock);
1317 return -ERESTARTSYS;
1318 }
1319
1320 /* if the file did the capture, free the streaming resources */
1321 if (gspca_dev->capt_file == file) {
1322 if (gspca_dev->streaming)
1323 gspca_stream_off(gspca_dev);
1324 frame_free(gspca_dev);
1325 }
1326 module_put(gspca_dev->module);
1327 mutex_unlock(&gspca_dev->queue_lock);
1328 mutex_unlock(&gspca_dev->usb_lock);
1329
1330 PDEBUG(D_STREAM, "close done");
1331
1332 return v4l2_fh_release(file);
1333 }
1334
1335 static int vidioc_querycap(struct file *file, void *priv,
1336 struct v4l2_capability *cap)
1337 {
1338 struct gspca_dev *gspca_dev = video_drvdata(file);
1339
1340 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1341 sizeof cap->driver);
1342 if (gspca_dev->dev->product != NULL) {
1343 strlcpy((char *) cap->card, gspca_dev->dev->product,
1344 sizeof cap->card);
1345 } else {
1346 snprintf((char *) cap->card, sizeof cap->card,
1347 "USB Camera (%04x:%04x)",
1348 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1349 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1350 }
1351 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1352 sizeof(cap->bus_info));
1353 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1354 | V4L2_CAP_STREAMING
1355 | V4L2_CAP_READWRITE;
1356 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1357 return 0;
1358 }
1359
1360 static int get_ctrl(struct gspca_dev *gspca_dev,
1361 int id)
1362 {
1363 const struct ctrl *ctrls;
1364 int i;
1365
1366 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1367 i < gspca_dev->sd_desc->nctrls;
1368 i++, ctrls++) {
1369 if (gspca_dev->ctrl_dis & (1 << i))
1370 continue;
1371 if (id == ctrls->qctrl.id)
1372 return i;
1373 }
1374 return -1;
1375 }
1376
1377 static int vidioc_queryctrl(struct file *file, void *priv,
1378 struct v4l2_queryctrl *q_ctrl)
1379 {
1380 struct gspca_dev *gspca_dev = video_drvdata(file);
1381 const struct ctrl *ctrls;
1382 struct gspca_ctrl *gspca_ctrl;
1383 int i, idx;
1384 u32 id;
1385
1386 id = q_ctrl->id;
1387 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1388 id &= V4L2_CTRL_ID_MASK;
1389 id++;
1390 idx = -1;
1391 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1392 if (gspca_dev->ctrl_dis & (1 << i))
1393 continue;
1394 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1395 continue;
1396 if (idx >= 0
1397 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1398 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1399 continue;
1400 idx = i;
1401 }
1402 } else {
1403 idx = get_ctrl(gspca_dev, id);
1404 }
1405 if (idx < 0)
1406 return -EINVAL;
1407 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1408 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1409 if (gspca_dev->cam.ctrls != NULL) {
1410 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1411 q_ctrl->default_value = gspca_ctrl->def;
1412 q_ctrl->minimum = gspca_ctrl->min;
1413 q_ctrl->maximum = gspca_ctrl->max;
1414 }
1415 if (gspca_dev->ctrl_inac & (1 << idx))
1416 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1417 return 0;
1418 }
1419
1420 static int vidioc_s_ctrl(struct file *file, void *priv,
1421 struct v4l2_control *ctrl)
1422 {
1423 struct gspca_dev *gspca_dev = video_drvdata(file);
1424 const struct ctrl *ctrls;
1425 struct gspca_ctrl *gspca_ctrl;
1426 int idx;
1427
1428 idx = get_ctrl(gspca_dev, ctrl->id);
1429 if (idx < 0)
1430 return -EINVAL;
1431 if (gspca_dev->ctrl_inac & (1 << idx))
1432 return -EINVAL;
1433 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1434 if (gspca_dev->cam.ctrls != NULL) {
1435 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1436 if (ctrl->value < gspca_ctrl->min
1437 || ctrl->value > gspca_ctrl->max)
1438 return -ERANGE;
1439 } else {
1440 gspca_ctrl = NULL;
1441 if (ctrl->value < ctrls->qctrl.minimum
1442 || ctrl->value > ctrls->qctrl.maximum)
1443 return -ERANGE;
1444 }
1445 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1446 gspca_dev->usb_err = 0;
1447 if (ctrls->set != NULL)
1448 return ctrls->set(gspca_dev, ctrl->value);
1449 if (gspca_ctrl != NULL) {
1450 gspca_ctrl->val = ctrl->value;
1451 if (ctrls->set_control != NULL
1452 && gspca_dev->streaming)
1453 ctrls->set_control(gspca_dev);
1454 }
1455 return gspca_dev->usb_err;
1456 }
1457
1458 static int vidioc_g_ctrl(struct file *file, void *priv,
1459 struct v4l2_control *ctrl)
1460 {
1461 struct gspca_dev *gspca_dev = video_drvdata(file);
1462 const struct ctrl *ctrls;
1463 int idx;
1464
1465 idx = get_ctrl(gspca_dev, ctrl->id);
1466 if (idx < 0)
1467 return -EINVAL;
1468 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1469
1470 gspca_dev->usb_err = 0;
1471 if (ctrls->get != NULL)
1472 return ctrls->get(gspca_dev, &ctrl->value);
1473 if (gspca_dev->cam.ctrls != NULL)
1474 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1475 return 0;
1476 }
1477
1478 static int vidioc_querymenu(struct file *file, void *priv,
1479 struct v4l2_querymenu *qmenu)
1480 {
1481 struct gspca_dev *gspca_dev = video_drvdata(file);
1482
1483 if (!gspca_dev->sd_desc->querymenu)
1484 return -ENOTTY;
1485 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1486 }
1487
1488 static int vidioc_enum_input(struct file *file, void *priv,
1489 struct v4l2_input *input)
1490 {
1491 struct gspca_dev *gspca_dev = video_drvdata(file);
1492
1493 if (input->index != 0)
1494 return -EINVAL;
1495 input->type = V4L2_INPUT_TYPE_CAMERA;
1496 input->status = gspca_dev->cam.input_flags;
1497 strlcpy(input->name, gspca_dev->sd_desc->name,
1498 sizeof input->name);
1499 return 0;
1500 }
1501
1502 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1503 {
1504 *i = 0;
1505 return 0;
1506 }
1507
1508 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1509 {
1510 if (i > 0)
1511 return -EINVAL;
1512 return (0);
1513 }
1514
1515 static int vidioc_reqbufs(struct file *file, void *priv,
1516 struct v4l2_requestbuffers *rb)
1517 {
1518 struct gspca_dev *gspca_dev = video_drvdata(file);
1519 int i, ret = 0, streaming;
1520
1521 i = rb->memory; /* (avoid compilation warning) */
1522 switch (i) {
1523 case GSPCA_MEMORY_READ: /* (internal call) */
1524 case V4L2_MEMORY_MMAP:
1525 case V4L2_MEMORY_USERPTR:
1526 break;
1527 default:
1528 return -EINVAL;
1529 }
1530 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1531 return -ERESTARTSYS;
1532
1533 if (gspca_dev->memory != GSPCA_MEMORY_NO
1534 && gspca_dev->memory != GSPCA_MEMORY_READ
1535 && gspca_dev->memory != rb->memory) {
1536 ret = -EBUSY;
1537 goto out;
1538 }
1539
1540 /* only one file may do the capture */
1541 if (gspca_dev->capt_file != NULL
1542 && gspca_dev->capt_file != file) {
1543 ret = -EBUSY;
1544 goto out;
1545 }
1546
1547 /* if allocated, the buffers must not be mapped */
1548 for (i = 0; i < gspca_dev->nframes; i++) {
1549 if (gspca_dev->frame[i].vma_use_count) {
1550 ret = -EBUSY;
1551 goto out;
1552 }
1553 }
1554
1555 /* stop streaming */
1556 streaming = gspca_dev->streaming;
1557 if (streaming) {
1558 gspca_stream_off(gspca_dev);
1559
1560 /* Don't restart the stream when switching from read
1561 * to mmap mode */
1562 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1563 streaming = 0;
1564 }
1565
1566 /* free the previous allocated buffers, if any */
1567 if (gspca_dev->nframes != 0)
1568 frame_free(gspca_dev);
1569 if (rb->count == 0) /* unrequest */
1570 goto out;
1571 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1572 if (ret == 0) {
1573 rb->count = gspca_dev->nframes;
1574 if (streaming)
1575 ret = gspca_init_transfer(gspca_dev);
1576 }
1577 out:
1578 mutex_unlock(&gspca_dev->queue_lock);
1579 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1580 return ret;
1581 }
1582
1583 static int vidioc_querybuf(struct file *file, void *priv,
1584 struct v4l2_buffer *v4l2_buf)
1585 {
1586 struct gspca_dev *gspca_dev = video_drvdata(file);
1587 struct gspca_frame *frame;
1588
1589 if (v4l2_buf->index < 0
1590 || v4l2_buf->index >= gspca_dev->nframes)
1591 return -EINVAL;
1592
1593 frame = &gspca_dev->frame[v4l2_buf->index];
1594 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1595 return 0;
1596 }
1597
1598 static int vidioc_streamon(struct file *file, void *priv,
1599 enum v4l2_buf_type buf_type)
1600 {
1601 struct gspca_dev *gspca_dev = video_drvdata(file);
1602 int ret;
1603
1604 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1605 return -EINVAL;
1606 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1607 return -ERESTARTSYS;
1608
1609 /* check the capture file */
1610 if (gspca_dev->capt_file != file) {
1611 ret = -EBUSY;
1612 goto out;
1613 }
1614
1615 if (gspca_dev->nframes == 0
1616 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1617 ret = -EINVAL;
1618 goto out;
1619 }
1620 if (!gspca_dev->streaming) {
1621 ret = gspca_init_transfer(gspca_dev);
1622 if (ret < 0)
1623 goto out;
1624 }
1625 #ifdef GSPCA_DEBUG
1626 if (gspca_debug & D_STREAM) {
1627 PDEBUG_MODE("stream on OK",
1628 gspca_dev->pixfmt,
1629 gspca_dev->width,
1630 gspca_dev->height);
1631 }
1632 #endif
1633 ret = 0;
1634 out:
1635 mutex_unlock(&gspca_dev->queue_lock);
1636 return ret;
1637 }
1638
1639 static int vidioc_streamoff(struct file *file, void *priv,
1640 enum v4l2_buf_type buf_type)
1641 {
1642 struct gspca_dev *gspca_dev = video_drvdata(file);
1643 int i, ret;
1644
1645 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1646 return -EINVAL;
1647
1648 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1649 return -ERESTARTSYS;
1650
1651 if (!gspca_dev->streaming) {
1652 ret = 0;
1653 goto out;
1654 }
1655
1656 /* check the capture file */
1657 if (gspca_dev->capt_file != file) {
1658 ret = -EBUSY;
1659 goto out;
1660 }
1661
1662 /* stop streaming */
1663 gspca_stream_off(gspca_dev);
1664 /* In case another thread is waiting in dqbuf */
1665 wake_up_interruptible(&gspca_dev->wq);
1666
1667 /* empty the transfer queues */
1668 for (i = 0; i < gspca_dev->nframes; i++)
1669 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1670 atomic_set(&gspca_dev->fr_q, 0);
1671 atomic_set(&gspca_dev->fr_i, 0);
1672 gspca_dev->fr_o = 0;
1673 ret = 0;
1674 out:
1675 mutex_unlock(&gspca_dev->queue_lock);
1676 return ret;
1677 }
1678
1679 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1680 struct v4l2_jpegcompression *jpegcomp)
1681 {
1682 struct gspca_dev *gspca_dev = video_drvdata(file);
1683
1684 gspca_dev->usb_err = 0;
1685 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1686 }
1687
1688 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1689 const struct v4l2_jpegcompression *jpegcomp)
1690 {
1691 struct gspca_dev *gspca_dev = video_drvdata(file);
1692
1693 gspca_dev->usb_err = 0;
1694 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1695 }
1696
1697 static int vidioc_g_parm(struct file *filp, void *priv,
1698 struct v4l2_streamparm *parm)
1699 {
1700 struct gspca_dev *gspca_dev = video_drvdata(filp);
1701
1702 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1703
1704 if (gspca_dev->sd_desc->get_streamparm) {
1705 gspca_dev->usb_err = 0;
1706 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1707 return gspca_dev->usb_err;
1708 }
1709 return 0;
1710 }
1711
1712 static int vidioc_s_parm(struct file *filp, void *priv,
1713 struct v4l2_streamparm *parm)
1714 {
1715 struct gspca_dev *gspca_dev = video_drvdata(filp);
1716 int n;
1717
1718 n = parm->parm.capture.readbuffers;
1719 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1720 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1721 else
1722 gspca_dev->nbufread = n;
1723
1724 if (gspca_dev->sd_desc->set_streamparm) {
1725 gspca_dev->usb_err = 0;
1726 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1727 return gspca_dev->usb_err;
1728 }
1729
1730 return 0;
1731 }
1732
1733 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1734 {
1735 struct gspca_dev *gspca_dev = video_drvdata(file);
1736 struct gspca_frame *frame;
1737 struct page *page;
1738 unsigned long addr, start, size;
1739 int i, ret;
1740
1741 start = vma->vm_start;
1742 size = vma->vm_end - vma->vm_start;
1743 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1744
1745 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1746 return -ERESTARTSYS;
1747 if (gspca_dev->capt_file != file) {
1748 ret = -EINVAL;
1749 goto out;
1750 }
1751
1752 frame = NULL;
1753 for (i = 0; i < gspca_dev->nframes; ++i) {
1754 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1755 PDEBUG(D_STREAM, "mmap bad memory type");
1756 break;
1757 }
1758 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1759 == vma->vm_pgoff) {
1760 frame = &gspca_dev->frame[i];
1761 break;
1762 }
1763 }
1764 if (frame == NULL) {
1765 PDEBUG(D_STREAM, "mmap no frame buffer found");
1766 ret = -EINVAL;
1767 goto out;
1768 }
1769 if (size != frame->v4l2_buf.length) {
1770 PDEBUG(D_STREAM, "mmap bad size");
1771 ret = -EINVAL;
1772 goto out;
1773 }
1774
1775 /*
1776 * - VM_IO marks the area as being a mmaped region for I/O to a
1777 * device. It also prevents the region from being core dumped.
1778 */
1779 vma->vm_flags |= VM_IO;
1780
1781 addr = (unsigned long) frame->data;
1782 while (size > 0) {
1783 page = vmalloc_to_page((void *) addr);
1784 ret = vm_insert_page(vma, start, page);
1785 if (ret < 0)
1786 goto out;
1787 start += PAGE_SIZE;
1788 addr += PAGE_SIZE;
1789 size -= PAGE_SIZE;
1790 }
1791
1792 vma->vm_ops = &gspca_vm_ops;
1793 vma->vm_private_data = frame;
1794 gspca_vm_open(vma);
1795 ret = 0;
1796 out:
1797 mutex_unlock(&gspca_dev->queue_lock);
1798 return ret;
1799 }
1800
1801 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1802 enum v4l2_memory memory)
1803 {
1804 if (!gspca_dev->present)
1805 return -ENODEV;
1806 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1807 !gspca_dev->streaming)
1808 return -EINVAL;
1809
1810 /* check if a frame is ready */
1811 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1812 }
1813
1814 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1815 enum v4l2_memory memory)
1816 {
1817 int ret;
1818
1819 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1820 return -ERESTARTSYS;
1821 ret = frame_ready_nolock(gspca_dev, file, memory);
1822 mutex_unlock(&gspca_dev->queue_lock);
1823 return ret;
1824 }
1825
1826 /*
1827 * dequeue a video buffer
1828 *
1829 * If nonblock_ing is false, block until a buffer is available.
1830 */
1831 static int vidioc_dqbuf(struct file *file, void *priv,
1832 struct v4l2_buffer *v4l2_buf)
1833 {
1834 struct gspca_dev *gspca_dev = video_drvdata(file);
1835 struct gspca_frame *frame;
1836 int i, j, ret;
1837
1838 PDEBUG(D_FRAM, "dqbuf");
1839
1840 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1841 return -ERESTARTSYS;
1842
1843 for (;;) {
1844 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1845 if (ret < 0)
1846 goto out;
1847 if (ret > 0)
1848 break;
1849
1850 mutex_unlock(&gspca_dev->queue_lock);
1851
1852 if (file->f_flags & O_NONBLOCK)
1853 return -EAGAIN;
1854
1855 /* wait till a frame is ready */
1856 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1857 frame_ready(gspca_dev, file, v4l2_buf->memory),
1858 msecs_to_jiffies(3000));
1859 if (ret < 0)
1860 return ret;
1861 if (ret == 0)
1862 return -EIO;
1863
1864 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1865 return -ERESTARTSYS;
1866 }
1867
1868 i = gspca_dev->fr_o;
1869 j = gspca_dev->fr_queue[i];
1870 frame = &gspca_dev->frame[j];
1871
1872 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1873
1874 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1875 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1876 PDEBUG(D_FRAM, "dqbuf %d", j);
1877 ret = 0;
1878
1879 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1880 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1881 frame->data,
1882 frame->v4l2_buf.bytesused)) {
1883 PDEBUG(D_ERR|D_STREAM,
1884 "dqbuf cp to user failed");
1885 ret = -EFAULT;
1886 }
1887 }
1888 out:
1889 mutex_unlock(&gspca_dev->queue_lock);
1890
1891 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1892 mutex_lock(&gspca_dev->usb_lock);
1893 gspca_dev->usb_err = 0;
1894 if (gspca_dev->present)
1895 gspca_dev->sd_desc->dq_callback(gspca_dev);
1896 mutex_unlock(&gspca_dev->usb_lock);
1897 }
1898
1899 return ret;
1900 }
1901
1902 /*
1903 * queue a video buffer
1904 *
1905 * Attempting to queue a buffer that has already been
1906 * queued will return -EINVAL.
1907 */
1908 static int vidioc_qbuf(struct file *file, void *priv,
1909 struct v4l2_buffer *v4l2_buf)
1910 {
1911 struct gspca_dev *gspca_dev = video_drvdata(file);
1912 struct gspca_frame *frame;
1913 int i, index, ret;
1914
1915 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1916
1917 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1918 return -ERESTARTSYS;
1919
1920 index = v4l2_buf->index;
1921 if ((unsigned) index >= gspca_dev->nframes) {
1922 PDEBUG(D_FRAM,
1923 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1924 ret = -EINVAL;
1925 goto out;
1926 }
1927 if (v4l2_buf->memory != gspca_dev->memory) {
1928 PDEBUG(D_FRAM, "qbuf bad memory type");
1929 ret = -EINVAL;
1930 goto out;
1931 }
1932
1933 frame = &gspca_dev->frame[index];
1934 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1935 PDEBUG(D_FRAM, "qbuf bad state");
1936 ret = -EINVAL;
1937 goto out;
1938 }
1939
1940 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1941
1942 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1943 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1944 frame->v4l2_buf.length = v4l2_buf->length;
1945 }
1946
1947 /* put the buffer in the 'queued' queue */
1948 i = atomic_read(&gspca_dev->fr_q);
1949 gspca_dev->fr_queue[i] = index;
1950 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1951
1952 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1953 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1954 ret = 0;
1955 out:
1956 mutex_unlock(&gspca_dev->queue_lock);
1957 return ret;
1958 }
1959
1960 /*
1961 * allocate the resources for read()
1962 */
1963 static int read_alloc(struct gspca_dev *gspca_dev,
1964 struct file *file)
1965 {
1966 struct v4l2_buffer v4l2_buf;
1967 int i, ret;
1968
1969 PDEBUG(D_STREAM, "read alloc");
1970
1971 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1972 return -ERESTARTSYS;
1973
1974 if (gspca_dev->nframes == 0) {
1975 struct v4l2_requestbuffers rb;
1976
1977 memset(&rb, 0, sizeof rb);
1978 rb.count = gspca_dev->nbufread;
1979 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1980 rb.memory = GSPCA_MEMORY_READ;
1981 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1982 if (ret != 0) {
1983 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1984 goto out;
1985 }
1986 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1987 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1988 v4l2_buf.memory = GSPCA_MEMORY_READ;
1989 for (i = 0; i < gspca_dev->nbufread; i++) {
1990 v4l2_buf.index = i;
1991 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1992 if (ret != 0) {
1993 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1994 goto out;
1995 }
1996 }
1997 }
1998
1999 /* start streaming */
2000 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2001 if (ret != 0)
2002 PDEBUG(D_STREAM, "read streamon err %d", ret);
2003 out:
2004 mutex_unlock(&gspca_dev->usb_lock);
2005 return ret;
2006 }
2007
2008 static unsigned int dev_poll(struct file *file, poll_table *wait)
2009 {
2010 struct gspca_dev *gspca_dev = video_drvdata(file);
2011 unsigned long req_events = poll_requested_events(wait);
2012 int ret = 0;
2013
2014 PDEBUG(D_FRAM, "poll");
2015
2016 if (req_events & POLLPRI)
2017 ret |= v4l2_ctrl_poll(file, wait);
2018
2019 if (req_events & (POLLIN | POLLRDNORM)) {
2020 /* if reqbufs is not done, the user would use read() */
2021 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2022 if (read_alloc(gspca_dev, file) != 0) {
2023 ret |= POLLERR;
2024 goto out;
2025 }
2026 }
2027
2028 poll_wait(file, &gspca_dev->wq, wait);
2029
2030 /* check if an image has been received */
2031 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
2032 ret |= POLLERR;
2033 goto out;
2034 }
2035 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2036 ret |= POLLIN | POLLRDNORM;
2037 mutex_unlock(&gspca_dev->queue_lock);
2038 }
2039
2040 out:
2041 if (!gspca_dev->present)
2042 ret |= POLLHUP;
2043
2044 return ret;
2045 }
2046
2047 static ssize_t dev_read(struct file *file, char __user *data,
2048 size_t count, loff_t *ppos)
2049 {
2050 struct gspca_dev *gspca_dev = video_drvdata(file);
2051 struct gspca_frame *frame;
2052 struct v4l2_buffer v4l2_buf;
2053 struct timeval timestamp;
2054 int n, ret, ret2;
2055
2056 PDEBUG(D_FRAM, "read (%zd)", count);
2057 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2058 ret = read_alloc(gspca_dev, file);
2059 if (ret != 0)
2060 return ret;
2061 }
2062
2063 /* get a frame */
2064 timestamp = ktime_to_timeval(ktime_get());
2065 timestamp.tv_sec--;
2066 n = 2;
2067 for (;;) {
2068 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2069 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2070 v4l2_buf.memory = GSPCA_MEMORY_READ;
2071 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2072 if (ret != 0) {
2073 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2074 return ret;
2075 }
2076
2077 /* if the process slept for more than 1 second,
2078 * get a newer frame */
2079 frame = &gspca_dev->frame[v4l2_buf.index];
2080 if (--n < 0)
2081 break; /* avoid infinite loop */
2082 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2083 break;
2084 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2085 if (ret != 0) {
2086 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2087 return ret;
2088 }
2089 }
2090
2091 /* copy the frame */
2092 if (count > frame->v4l2_buf.bytesused)
2093 count = frame->v4l2_buf.bytesused;
2094 ret = copy_to_user(data, frame->data, count);
2095 if (ret != 0) {
2096 PDEBUG(D_ERR|D_STREAM,
2097 "read cp to user lack %d / %zd", ret, count);
2098 ret = -EFAULT;
2099 goto out;
2100 }
2101 ret = count;
2102 out:
2103 /* in each case, requeue the buffer */
2104 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2105 if (ret2 != 0)
2106 return ret2;
2107 return ret;
2108 }
2109
2110 static struct v4l2_file_operations dev_fops = {
2111 .owner = THIS_MODULE,
2112 .open = dev_open,
2113 .release = dev_close,
2114 .read = dev_read,
2115 .mmap = dev_mmap,
2116 .unlocked_ioctl = video_ioctl2,
2117 .poll = dev_poll,
2118 };
2119
2120 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2121 .vidioc_querycap = vidioc_querycap,
2122 .vidioc_dqbuf = vidioc_dqbuf,
2123 .vidioc_qbuf = vidioc_qbuf,
2124 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2125 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2126 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2127 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2128 .vidioc_streamon = vidioc_streamon,
2129 .vidioc_queryctrl = vidioc_queryctrl,
2130 .vidioc_g_ctrl = vidioc_g_ctrl,
2131 .vidioc_s_ctrl = vidioc_s_ctrl,
2132 .vidioc_querymenu = vidioc_querymenu,
2133 .vidioc_enum_input = vidioc_enum_input,
2134 .vidioc_g_input = vidioc_g_input,
2135 .vidioc_s_input = vidioc_s_input,
2136 .vidioc_reqbufs = vidioc_reqbufs,
2137 .vidioc_querybuf = vidioc_querybuf,
2138 .vidioc_streamoff = vidioc_streamoff,
2139 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2140 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2141 .vidioc_g_parm = vidioc_g_parm,
2142 .vidioc_s_parm = vidioc_s_parm,
2143 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2144 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2145 #ifdef CONFIG_VIDEO_ADV_DEBUG
2146 .vidioc_g_register = vidioc_g_register,
2147 .vidioc_s_register = vidioc_s_register,
2148 #endif
2149 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2150 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2151 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2152 };
2153
2154 static const struct video_device gspca_template = {
2155 .name = "gspca main driver",
2156 .fops = &dev_fops,
2157 .ioctl_ops = &dev_ioctl_ops,
2158 .release = video_device_release_empty, /* We use v4l2_dev.release */
2159 };
2160
2161 /* initialize the controls */
2162 static void ctrls_init(struct gspca_dev *gspca_dev)
2163 {
2164 struct gspca_ctrl *ctrl;
2165 int i;
2166
2167 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2168 i < gspca_dev->sd_desc->nctrls;
2169 i++, ctrl++) {
2170 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2171 ctrl->val = ctrl->def;
2172 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2173 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2174 }
2175 }
2176
2177 /*
2178 * probe and create a new gspca device
2179 *
2180 * This function must be called by the sub-driver when it is
2181 * called for probing a new device.
2182 */
2183 int gspca_dev_probe2(struct usb_interface *intf,
2184 const struct usb_device_id *id,
2185 const struct sd_desc *sd_desc,
2186 int dev_size,
2187 struct module *module)
2188 {
2189 struct gspca_dev *gspca_dev;
2190 struct usb_device *dev = interface_to_usbdev(intf);
2191 int ret;
2192
2193 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2194 sd_desc->name, id->idVendor, id->idProduct);
2195
2196 /* create the device */
2197 if (dev_size < sizeof *gspca_dev)
2198 dev_size = sizeof *gspca_dev;
2199 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2200 if (!gspca_dev) {
2201 pr_err("couldn't kzalloc gspca struct\n");
2202 return -ENOMEM;
2203 }
2204 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2205 if (!gspca_dev->usb_buf) {
2206 pr_err("out of memory\n");
2207 ret = -ENOMEM;
2208 goto out;
2209 }
2210 gspca_dev->dev = dev;
2211 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2212
2213 /* check if any audio device */
2214 if (dev->actconfig->desc.bNumInterfaces != 1) {
2215 int i;
2216 struct usb_interface *intf2;
2217
2218 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2219 intf2 = dev->actconfig->interface[i];
2220 if (intf2 != NULL
2221 && intf2->altsetting != NULL
2222 && intf2->altsetting->desc.bInterfaceClass ==
2223 USB_CLASS_AUDIO) {
2224 gspca_dev->audio = 1;
2225 break;
2226 }
2227 }
2228 }
2229
2230 gspca_dev->v4l2_dev.release = gspca_release;
2231 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2232 if (ret)
2233 goto out;
2234 gspca_dev->sd_desc = sd_desc;
2235 gspca_dev->nbufread = 2;
2236 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2237 gspca_dev->vdev = gspca_template;
2238 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2239 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2240 set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2241 gspca_dev->module = module;
2242 gspca_dev->present = 1;
2243
2244 mutex_init(&gspca_dev->usb_lock);
2245 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2246 mutex_init(&gspca_dev->queue_lock);
2247 init_waitqueue_head(&gspca_dev->wq);
2248
2249 /* configure the subdriver and initialize the USB device */
2250 ret = sd_desc->config(gspca_dev, id);
2251 if (ret < 0)
2252 goto out;
2253 if (gspca_dev->cam.ctrls != NULL)
2254 ctrls_init(gspca_dev);
2255 ret = sd_desc->init(gspca_dev);
2256 if (ret < 0)
2257 goto out;
2258 if (sd_desc->init_controls)
2259 ret = sd_desc->init_controls(gspca_dev);
2260 if (ret < 0)
2261 goto out;
2262 gspca_set_default_mode(gspca_dev);
2263
2264 ret = gspca_input_connect(gspca_dev);
2265 if (ret)
2266 goto out;
2267
2268 /*
2269 * Don't take usb_lock for these ioctls. This improves latency if
2270 * usb_lock is taken for a long time, e.g. when changing a control
2271 * value, and a new frame is ready to be dequeued.
2272 */
2273 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2274 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2275 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2276 if (!gspca_dev->sd_desc->get_chip_ident)
2277 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_CHIP_IDENT);
2278 #ifdef CONFIG_VIDEO_ADV_DEBUG
2279 if (!gspca_dev->sd_desc->get_chip_ident ||
2280 !gspca_dev->sd_desc->get_register)
2281 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2282 if (!gspca_dev->sd_desc->get_chip_ident ||
2283 !gspca_dev->sd_desc->set_register)
2284 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2285 #endif
2286 if (!gspca_dev->sd_desc->get_jcomp)
2287 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2288 if (!gspca_dev->sd_desc->set_jcomp)
2289 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2290
2291 /* init video stuff */
2292 ret = video_register_device(&gspca_dev->vdev,
2293 VFL_TYPE_GRABBER,
2294 -1);
2295 if (ret < 0) {
2296 pr_err("video_register_device err %d\n", ret);
2297 goto out;
2298 }
2299
2300 usb_set_intfdata(intf, gspca_dev);
2301 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2302
2303 gspca_input_create_urb(gspca_dev);
2304
2305 return 0;
2306 out:
2307 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2308 if (gspca_dev->input_dev)
2309 input_unregister_device(gspca_dev->input_dev);
2310 #endif
2311 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2312 kfree(gspca_dev->usb_buf);
2313 kfree(gspca_dev);
2314 return ret;
2315 }
2316 EXPORT_SYMBOL(gspca_dev_probe2);
2317
2318 /* same function as the previous one, but check the interface */
2319 int gspca_dev_probe(struct usb_interface *intf,
2320 const struct usb_device_id *id,
2321 const struct sd_desc *sd_desc,
2322 int dev_size,
2323 struct module *module)
2324 {
2325 struct usb_device *dev = interface_to_usbdev(intf);
2326
2327 /* we don't handle multi-config cameras */
2328 if (dev->descriptor.bNumConfigurations != 1) {
2329 pr_err("%04x:%04x too many config\n",
2330 id->idVendor, id->idProduct);
2331 return -ENODEV;
2332 }
2333
2334 /* the USB video interface must be the first one */
2335 if (dev->actconfig->desc.bNumInterfaces != 1
2336 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2337 return -ENODEV;
2338
2339 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2340 }
2341 EXPORT_SYMBOL(gspca_dev_probe);
2342
2343 /*
2344 * USB disconnection
2345 *
2346 * This function must be called by the sub-driver
2347 * when the device disconnects, after the specific resources are freed.
2348 */
2349 void gspca_disconnect(struct usb_interface *intf)
2350 {
2351 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2352 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2353 struct input_dev *input_dev;
2354 #endif
2355
2356 PDEBUG(D_PROBE, "%s disconnect",
2357 video_device_node_name(&gspca_dev->vdev));
2358
2359 mutex_lock(&gspca_dev->usb_lock);
2360
2361 gspca_dev->present = 0;
2362 destroy_urbs(gspca_dev);
2363
2364 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2365 gspca_input_destroy_urb(gspca_dev);
2366 input_dev = gspca_dev->input_dev;
2367 if (input_dev) {
2368 gspca_dev->input_dev = NULL;
2369 input_unregister_device(input_dev);
2370 }
2371 #endif
2372 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2373 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2374 gspca_dev->sd_desc->stop0(gspca_dev);
2375 gspca_dev->streaming = 0;
2376 gspca_dev->dev = NULL;
2377 wake_up_interruptible(&gspca_dev->wq);
2378
2379 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2380 video_unregister_device(&gspca_dev->vdev);
2381
2382 mutex_unlock(&gspca_dev->usb_lock);
2383
2384 /* (this will call gspca_release() immediately or on last close) */
2385 v4l2_device_put(&gspca_dev->v4l2_dev);
2386 }
2387 EXPORT_SYMBOL(gspca_disconnect);
2388
2389 #ifdef CONFIG_PM
2390 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2391 {
2392 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2393
2394 gspca_input_destroy_urb(gspca_dev);
2395
2396 if (!gspca_dev->streaming)
2397 return 0;
2398
2399 mutex_lock(&gspca_dev->usb_lock);
2400 gspca_dev->frozen = 1; /* avoid urb error messages */
2401 gspca_dev->usb_err = 0;
2402 if (gspca_dev->sd_desc->stopN)
2403 gspca_dev->sd_desc->stopN(gspca_dev);
2404 destroy_urbs(gspca_dev);
2405 gspca_set_alt0(gspca_dev);
2406 if (gspca_dev->sd_desc->stop0)
2407 gspca_dev->sd_desc->stop0(gspca_dev);
2408 mutex_unlock(&gspca_dev->usb_lock);
2409
2410 return 0;
2411 }
2412 EXPORT_SYMBOL(gspca_suspend);
2413
2414 int gspca_resume(struct usb_interface *intf)
2415 {
2416 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2417 int streaming, ret = 0;
2418
2419 mutex_lock(&gspca_dev->usb_lock);
2420 gspca_dev->frozen = 0;
2421 gspca_dev->usb_err = 0;
2422 gspca_dev->sd_desc->init(gspca_dev);
2423 /*
2424 * Most subdrivers send all ctrl values on sd_start and thus
2425 * only write to the device registers on s_ctrl when streaming ->
2426 * Clear streaming to avoid setting all ctrls twice.
2427 */
2428 streaming = gspca_dev->streaming;
2429 gspca_dev->streaming = 0;
2430 if (streaming)
2431 ret = gspca_init_transfer(gspca_dev);
2432 else
2433 gspca_input_create_urb(gspca_dev);
2434 mutex_unlock(&gspca_dev->usb_lock);
2435
2436 return ret;
2437 }
2438 EXPORT_SYMBOL(gspca_resume);
2439 #endif
2440
2441 /* -- module insert / remove -- */
2442 static int __init gspca_init(void)
2443 {
2444 pr_info("v" GSPCA_VERSION " registered\n");
2445 return 0;
2446 }
2447 static void __exit gspca_exit(void)
2448 {
2449 }
2450
2451 module_init(gspca_init);
2452 module_exit(gspca_exit);
2453
2454 #ifdef GSPCA_DEBUG
2455 module_param_named(debug, gspca_debug, int, 0644);
2456 MODULE_PARM_DESC(debug,
2457 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2458 " 0x08:stream 0x10:frame 0x20:packet"
2459 " 0x0100: v4l2");
2460 #endif
Linux kernel - Deliverables
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