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Linux 3.11-rc3
[cris-mirror.git] / drivers / media / usb / gspca / gspca.c
blobb7ae8721b84788a842cd84f9bef7ef1592434371
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 IS_ENABLED(CONFIG_INPUT)
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 int gspca_debug;
64 EXPORT_SYMBOL(gspca_debug);
65
66 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
67 __u32 pixfmt, int w, int h)
68 {
69 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
70 PDEBUG(debug, "%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(debug, "%s 0x%08x %dx%d",
79 txt,
80 pixfmt,
81 w, h);
82 }
83 }
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 IS_ENABLED(CONFIG_INPUT)
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 PERR("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 PERR("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 PERR("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 PERR("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 PERR("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 PERR("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 usb_free_coherent(gspca_dev->dev,
571 urb->transfer_buffer_length,
572 urb->transfer_buffer,
573 urb->transfer_dma);
574 usb_free_urb(urb);
575 }
576 }
577
578 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
579 {
580 int ret;
581
582 if (gspca_dev->alt == 0)
583 return 0;
584 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
585 if (ret < 0)
586 pr_err("set alt 0 err %d\n", ret);
587 return ret;
588 }
589
590 /* Note: both the queue and the usb locks should be held when calling this */
591 static void gspca_stream_off(struct gspca_dev *gspca_dev)
592 {
593 gspca_dev->streaming = 0;
594 gspca_dev->usb_err = 0;
595 if (gspca_dev->sd_desc->stopN)
596 gspca_dev->sd_desc->stopN(gspca_dev);
597 destroy_urbs(gspca_dev);
598 gspca_input_destroy_urb(gspca_dev);
599 gspca_set_alt0(gspca_dev);
600 gspca_input_create_urb(gspca_dev);
601 if (gspca_dev->sd_desc->stop0)
602 gspca_dev->sd_desc->stop0(gspca_dev);
603 PDEBUG(D_STREAM, "stream off OK");
604 }
605
606 /*
607 * look for an input transfer endpoint in an alternate setting
608 */
609 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
610 int xfer)
611 {
612 struct usb_host_endpoint *ep;
613 int i, attr;
614
615 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
616 ep = &alt->endpoint[i];
617 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
618 if (attr == xfer
619 && ep->desc.wMaxPacketSize != 0
620 && usb_endpoint_dir_in(&ep->desc))
621 return ep;
622 }
623 return NULL;
624 }
625
626 /* compute the minimum bandwidth for the current transfer */
627 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
628 {
629 u32 bandwidth;
630 int i;
631
632 /* get the (max) image size */
633 i = gspca_dev->curr_mode;
634 bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
635
636 /* if the image is compressed, estimate its mean size */
637 if (!gspca_dev->cam.needs_full_bandwidth &&
638 bandwidth < gspca_dev->cam.cam_mode[i].width *
639 gspca_dev->cam.cam_mode[i].height)
640 bandwidth = bandwidth * 3 / 8; /* 0.375 */
641
642 /* estimate the frame rate */
643 if (gspca_dev->sd_desc->get_streamparm) {
644 struct v4l2_streamparm parm;
645
646 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
647 bandwidth *= parm.parm.capture.timeperframe.denominator;
648 bandwidth /= parm.parm.capture.timeperframe.numerator;
649 } else {
650
651 /* don't hope more than 15 fps with USB 1.1 and
652 * image resolution >= 640x480 */
653 if (gspca_dev->width >= 640
654 && gspca_dev->dev->speed == USB_SPEED_FULL)
655 bandwidth *= 15; /* 15 fps */
656 else
657 bandwidth *= 30; /* 30 fps */
658 }
659
660 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
661 return bandwidth;
662 }
663
664 /* endpoint table */
665 #define MAX_ALT 16
666 struct ep_tb_s {
667 u32 alt;
668 u32 bandwidth;
669 };
670
671 /*
672 * build the table of the endpoints
673 * and compute the minimum bandwidth for the image transfer
674 */
675 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
676 struct usb_interface *intf,
677 struct ep_tb_s *ep_tb)
678 {
679 struct usb_host_endpoint *ep;
680 int i, j, nbalt, psize, found;
681 u32 bandwidth, last_bw;
682
683 nbalt = intf->num_altsetting;
684 if (nbalt > MAX_ALT)
685 nbalt = MAX_ALT; /* fixme: should warn */
686
687 /* build the endpoint table */
688 i = 0;
689 last_bw = 0;
690 for (;;) {
691 ep_tb->bandwidth = 2000 * 2000 * 120;
692 found = 0;
693 for (j = 0; j < nbalt; j++) {
694 ep = alt_xfer(&intf->altsetting[j],
695 USB_ENDPOINT_XFER_ISOC);
696 if (ep == NULL)
697 continue;
698 if (ep->desc.bInterval == 0) {
699 pr_err("alt %d iso endp with 0 interval\n", j);
700 continue;
701 }
702 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
703 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
704 bandwidth = psize * 1000;
705 if (gspca_dev->dev->speed == USB_SPEED_HIGH
706 || gspca_dev->dev->speed == USB_SPEED_SUPER)
707 bandwidth *= 8;
708 bandwidth /= 1 << (ep->desc.bInterval - 1);
709 if (bandwidth <= last_bw)
710 continue;
711 if (bandwidth < ep_tb->bandwidth) {
712 ep_tb->bandwidth = bandwidth;
713 ep_tb->alt = j;
714 found = 1;
715 }
716 }
717 if (!found)
718 break;
719 PDEBUG(D_STREAM, "alt %d bandwidth %d",
720 ep_tb->alt, ep_tb->bandwidth);
721 last_bw = ep_tb->bandwidth;
722 i++;
723 ep_tb++;
724 }
725
726 /*
727 * If the camera:
728 * has a usb audio class interface (a built in usb mic); and
729 * is a usb 1 full speed device; and
730 * uses the max full speed iso bandwidth; and
731 * and has more than 1 alt setting
732 * then skip the highest alt setting to spare bandwidth for the mic
733 */
734 if (gspca_dev->audio &&
735 gspca_dev->dev->speed == USB_SPEED_FULL &&
736 last_bw >= 1000000 &&
737 i > 1) {
738 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
739 i--;
740 ep_tb--;
741 }
742
743 /* get the requested bandwidth and start at the highest atlsetting */
744 bandwidth = which_bandwidth(gspca_dev);
745 ep_tb--;
746 while (i > 1) {
747 ep_tb--;
748 if (ep_tb->bandwidth < bandwidth)
749 break;
750 i--;
751 }
752 return i;
753 }
754
755 /*
756 * create the URBs for image transfer
757 */
758 static int create_urbs(struct gspca_dev *gspca_dev,
759 struct usb_host_endpoint *ep)
760 {
761 struct urb *urb;
762 int n, nurbs, i, psize, npkt, bsize;
763
764 /* calculate the packet size and the number of packets */
765 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
766
767 if (!gspca_dev->cam.bulk) { /* isoc */
768
769 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
770 if (gspca_dev->pkt_size == 0)
771 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
772 else
773 psize = gspca_dev->pkt_size;
774 npkt = gspca_dev->cam.npkt;
775 if (npkt == 0)
776 npkt = 32; /* default value */
777 bsize = psize * npkt;
778 PDEBUG(D_STREAM,
779 "isoc %d pkts size %d = bsize:%d",
780 npkt, psize, bsize);
781 nurbs = DEF_NURBS;
782 } else { /* bulk */
783 npkt = 0;
784 bsize = gspca_dev->cam.bulk_size;
785 if (bsize == 0)
786 bsize = psize;
787 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
788 if (gspca_dev->cam.bulk_nurbs != 0)
789 nurbs = gspca_dev->cam.bulk_nurbs;
790 else
791 nurbs = 1;
792 }
793
794 for (n = 0; n < nurbs; n++) {
795 urb = usb_alloc_urb(npkt, GFP_KERNEL);
796 if (!urb) {
797 pr_err("usb_alloc_urb failed\n");
798 return -ENOMEM;
799 }
800 gspca_dev->urb[n] = urb;
801 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
802 bsize,
803 GFP_KERNEL,
804 &urb->transfer_dma);
805
806 if (urb->transfer_buffer == NULL) {
807 pr_err("usb_alloc_coherent failed\n");
808 return -ENOMEM;
809 }
810 urb->dev = gspca_dev->dev;
811 urb->context = gspca_dev;
812 urb->transfer_buffer_length = bsize;
813 if (npkt != 0) { /* ISOC */
814 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
815 ep->desc.bEndpointAddress);
816 urb->transfer_flags = URB_ISO_ASAP
817 | URB_NO_TRANSFER_DMA_MAP;
818 urb->interval = 1 << (ep->desc.bInterval - 1);
819 urb->complete = isoc_irq;
820 urb->number_of_packets = npkt;
821 for (i = 0; i < npkt; i++) {
822 urb->iso_frame_desc[i].length = psize;
823 urb->iso_frame_desc[i].offset = psize * i;
824 }
825 } else { /* bulk */
826 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
827 ep->desc.bEndpointAddress);
828 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
829 urb->complete = bulk_irq;
830 }
831 }
832 return 0;
833 }
834
835 /*
836 * start the USB transfer
837 */
838 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
839 {
840 struct usb_interface *intf;
841 struct usb_host_endpoint *ep;
842 struct urb *urb;
843 struct ep_tb_s ep_tb[MAX_ALT];
844 int n, ret, xfer, alt, alt_idx;
845
846 /* reset the streaming variables */
847 gspca_dev->image = NULL;
848 gspca_dev->image_len = 0;
849 gspca_dev->last_packet_type = DISCARD_PACKET;
850 gspca_dev->sequence = 0;
851
852 gspca_dev->usb_err = 0;
853
854 /* do the specific subdriver stuff before endpoint selection */
855 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
856 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
857 if (gspca_dev->sd_desc->isoc_init) {
858 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
859 if (ret < 0)
860 return ret;
861 }
862 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
863 : USB_ENDPOINT_XFER_ISOC;
864
865 /* if bulk or the subdriver forced an altsetting, get the endpoint */
866 if (gspca_dev->alt != 0) {
867 gspca_dev->alt--; /* (previous version compatibility) */
868 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
869 if (ep == NULL) {
870 pr_err("bad altsetting %d\n", gspca_dev->alt);
871 return -EIO;
872 }
873 ep_tb[0].alt = gspca_dev->alt;
874 alt_idx = 1;
875 } else {
876
877 /* else, compute the minimum bandwidth
878 * and build the endpoint table */
879 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
880 if (alt_idx <= 0) {
881 pr_err("no transfer endpoint found\n");
882 return -EIO;
883 }
884 }
885
886 /* set the highest alternate setting and
887 * loop until urb submit succeeds */
888 gspca_input_destroy_urb(gspca_dev);
889
890 gspca_dev->alt = ep_tb[--alt_idx].alt;
891 alt = -1;
892 for (;;) {
893 if (alt != gspca_dev->alt) {
894 alt = gspca_dev->alt;
895 if (intf->num_altsetting > 1) {
896 ret = usb_set_interface(gspca_dev->dev,
897 gspca_dev->iface,
898 alt);
899 if (ret < 0) {
900 if (ret == -ENOSPC)
901 goto retry; /*fixme: ugly*/
902 pr_err("set alt %d err %d\n", alt, ret);
903 goto out;
904 }
905 }
906 }
907 if (!gspca_dev->cam.no_urb_create) {
908 PDEBUG(D_STREAM, "init transfer alt %d", alt);
909 ret = create_urbs(gspca_dev,
910 alt_xfer(&intf->altsetting[alt], xfer));
911 if (ret < 0) {
912 destroy_urbs(gspca_dev);
913 goto out;
914 }
915 }
916
917 /* clear the bulk endpoint */
918 if (gspca_dev->cam.bulk)
919 usb_clear_halt(gspca_dev->dev,
920 gspca_dev->urb[0]->pipe);
921
922 /* start the cam */
923 ret = gspca_dev->sd_desc->start(gspca_dev);
924 if (ret < 0) {
925 destroy_urbs(gspca_dev);
926 goto out;
927 }
928 gspca_dev->streaming = 1;
929 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
930
931 /* some bulk transfers are started by the subdriver */
932 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
933 break;
934
935 /* submit the URBs */
936 for (n = 0; n < MAX_NURBS; n++) {
937 urb = gspca_dev->urb[n];
938 if (urb == NULL)
939 break;
940 ret = usb_submit_urb(urb, GFP_KERNEL);
941 if (ret < 0)
942 break;
943 }
944 if (ret >= 0)
945 break; /* transfer is started */
946
947 /* something when wrong
948 * stop the webcam and free the transfer resources */
949 gspca_stream_off(gspca_dev);
950 if (ret != -ENOSPC) {
951 pr_err("usb_submit_urb alt %d err %d\n",
952 gspca_dev->alt, ret);
953 goto out;
954 }
955
956 /* the bandwidth is not wide enough
957 * negotiate or try a lower alternate setting */
958 retry:
959 PERR("alt %d - bandwidth not wide enough, trying again", alt);
960 msleep(20); /* wait for kill complete */
961 if (gspca_dev->sd_desc->isoc_nego) {
962 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
963 if (ret < 0)
964 goto out;
965 } else {
966 if (alt_idx <= 0) {
967 pr_err("no transfer endpoint found\n");
968 ret = -EIO;
969 goto out;
970 }
971 gspca_dev->alt = ep_tb[--alt_idx].alt;
972 }
973 }
974 out:
975 gspca_input_create_urb(gspca_dev);
976 return ret;
977 }
978
979 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
980 {
981 int i;
982
983 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
984 gspca_dev->curr_mode = i;
985 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
986 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
987 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
988
989 /* does nothing if ctrl_handler == NULL */
990 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
991 }
992
993 static int wxh_to_mode(struct gspca_dev *gspca_dev,
994 int width, int height)
995 {
996 int i;
997
998 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
999 if (width >= gspca_dev->cam.cam_mode[i].width
1000 && height >= gspca_dev->cam.cam_mode[i].height)
1001 break;
1002 }
1003 return i;
1004 }
1005
1006 /*
1007 * search a mode with the right pixel format
1008 */
1009 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1010 int mode,
1011 int pixfmt)
1012 {
1013 int modeU, modeD;
1014
1015 modeU = modeD = mode;
1016 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1017 if (--modeD >= 0) {
1018 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1019 == pixfmt)
1020 return modeD;
1021 }
1022 if (++modeU < gspca_dev->cam.nmodes) {
1023 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1024 == pixfmt)
1025 return modeU;
1026 }
1027 }
1028 return -EINVAL;
1029 }
1030
1031 #ifdef CONFIG_VIDEO_ADV_DEBUG
1032 static int vidioc_g_chip_info(struct file *file, void *priv,
1033 struct v4l2_dbg_chip_info *chip)
1034 {
1035 struct gspca_dev *gspca_dev = video_drvdata(file);
1036
1037 gspca_dev->usb_err = 0;
1038 if (gspca_dev->sd_desc->get_chip_info)
1039 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1040 return chip->match.addr ? -EINVAL : 0;
1041 }
1042
1043 static int vidioc_g_register(struct file *file, void *priv,
1044 struct v4l2_dbg_register *reg)
1045 {
1046 struct gspca_dev *gspca_dev = video_drvdata(file);
1047
1048 gspca_dev->usb_err = 0;
1049 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1050 }
1051
1052 static int vidioc_s_register(struct file *file, void *priv,
1053 const struct v4l2_dbg_register *reg)
1054 {
1055 struct gspca_dev *gspca_dev = video_drvdata(file);
1056
1057 gspca_dev->usb_err = 0;
1058 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1059 }
1060 #endif
1061
1062 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1063 struct v4l2_fmtdesc *fmtdesc)
1064 {
1065 struct gspca_dev *gspca_dev = video_drvdata(file);
1066 int i, j, index;
1067 __u32 fmt_tb[8];
1068
1069 /* give an index to each format */
1070 index = 0;
1071 j = 0;
1072 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1073 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1074 j = 0;
1075 for (;;) {
1076 if (fmt_tb[j] == fmt_tb[index])
1077 break;
1078 j++;
1079 }
1080 if (j == index) {
1081 if (fmtdesc->index == index)
1082 break; /* new format */
1083 index++;
1084 if (index >= ARRAY_SIZE(fmt_tb))
1085 return -EINVAL;
1086 }
1087 }
1088 if (i < 0)
1089 return -EINVAL; /* no more format */
1090
1091 fmtdesc->pixelformat = fmt_tb[index];
1092 if (gspca_dev->cam.cam_mode[i].sizeimage <
1093 gspca_dev->cam.cam_mode[i].width *
1094 gspca_dev->cam.cam_mode[i].height)
1095 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1096 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1097 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1098 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1099 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1100 fmtdesc->description[4] = '\0';
1101 return 0;
1102 }
1103
1104 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1105 struct v4l2_format *fmt)
1106 {
1107 struct gspca_dev *gspca_dev = video_drvdata(file);
1108 int mode;
1109
1110 mode = gspca_dev->curr_mode;
1111 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1112 /* some drivers use priv internally, zero it before giving it to
1113 userspace */
1114 fmt->fmt.pix.priv = 0;
1115 return 0;
1116 }
1117
1118 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1119 struct v4l2_format *fmt)
1120 {
1121 int w, h, mode, mode2;
1122
1123 w = fmt->fmt.pix.width;
1124 h = fmt->fmt.pix.height;
1125
1126 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1127 fmt->fmt.pix.pixelformat, w, h);
1128
1129 /* search the closest mode for width and height */
1130 mode = wxh_to_mode(gspca_dev, w, h);
1131
1132 /* OK if right palette */
1133 if (gspca_dev->cam.cam_mode[mode].pixelformat
1134 != fmt->fmt.pix.pixelformat) {
1135
1136 /* else, search the closest mode with the same pixel format */
1137 mode2 = gspca_get_mode(gspca_dev, mode,
1138 fmt->fmt.pix.pixelformat);
1139 if (mode2 >= 0)
1140 mode = mode2;
1141 }
1142 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1143 /* some drivers use priv internally, zero it before giving it to
1144 userspace */
1145 fmt->fmt.pix.priv = 0;
1146 return mode; /* used when s_fmt */
1147 }
1148
1149 static int vidioc_try_fmt_vid_cap(struct file *file,
1150 void *priv,
1151 struct v4l2_format *fmt)
1152 {
1153 struct gspca_dev *gspca_dev = video_drvdata(file);
1154 int ret;
1155
1156 ret = try_fmt_vid_cap(gspca_dev, fmt);
1157 if (ret < 0)
1158 return ret;
1159 return 0;
1160 }
1161
1162 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1163 struct v4l2_format *fmt)
1164 {
1165 struct gspca_dev *gspca_dev = video_drvdata(file);
1166 int ret;
1167
1168 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1169 return -ERESTARTSYS;
1170
1171 ret = try_fmt_vid_cap(gspca_dev, fmt);
1172 if (ret < 0)
1173 goto out;
1174
1175 if (gspca_dev->nframes != 0
1176 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1177 ret = -EINVAL;
1178 goto out;
1179 }
1180
1181 if (ret == gspca_dev->curr_mode) {
1182 ret = 0;
1183 goto out; /* same mode */
1184 }
1185
1186 if (gspca_dev->streaming) {
1187 ret = -EBUSY;
1188 goto out;
1189 }
1190 gspca_dev->width = fmt->fmt.pix.width;
1191 gspca_dev->height = fmt->fmt.pix.height;
1192 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1193 gspca_dev->curr_mode = ret;
1194
1195 ret = 0;
1196 out:
1197 mutex_unlock(&gspca_dev->queue_lock);
1198 return ret;
1199 }
1200
1201 static int vidioc_enum_framesizes(struct file *file, void *priv,
1202 struct v4l2_frmsizeenum *fsize)
1203 {
1204 struct gspca_dev *gspca_dev = video_drvdata(file);
1205 int i;
1206 __u32 index = 0;
1207
1208 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1209 if (fsize->pixel_format !=
1210 gspca_dev->cam.cam_mode[i].pixelformat)
1211 continue;
1212
1213 if (fsize->index == index) {
1214 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1215 fsize->discrete.width =
1216 gspca_dev->cam.cam_mode[i].width;
1217 fsize->discrete.height =
1218 gspca_dev->cam.cam_mode[i].height;
1219 return 0;
1220 }
1221 index++;
1222 }
1223
1224 return -EINVAL;
1225 }
1226
1227 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1228 struct v4l2_frmivalenum *fival)
1229 {
1230 struct gspca_dev *gspca_dev = video_drvdata(filp);
1231 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1232 __u32 i;
1233
1234 if (gspca_dev->cam.mode_framerates == NULL ||
1235 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1236 return -EINVAL;
1237
1238 if (fival->pixel_format !=
1239 gspca_dev->cam.cam_mode[mode].pixelformat)
1240 return -EINVAL;
1241
1242 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1243 if (fival->index == i) {
1244 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1245 fival->discrete.numerator = 1;
1246 fival->discrete.denominator =
1247 gspca_dev->cam.mode_framerates[mode].rates[i];
1248 return 0;
1249 }
1250 }
1251
1252 return -EINVAL;
1253 }
1254
1255 static void gspca_release(struct v4l2_device *v4l2_device)
1256 {
1257 struct gspca_dev *gspca_dev =
1258 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1259
1260 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1261 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1262 kfree(gspca_dev->usb_buf);
1263 kfree(gspca_dev);
1264 }
1265
1266 static int dev_open(struct file *file)
1267 {
1268 struct gspca_dev *gspca_dev = video_drvdata(file);
1269
1270 PDEBUG(D_STREAM, "[%s] open", current->comm);
1271
1272 /* protect the subdriver against rmmod */
1273 if (!try_module_get(gspca_dev->module))
1274 return -ENODEV;
1275
1276 return v4l2_fh_open(file);
1277 }
1278
1279 static int dev_close(struct file *file)
1280 {
1281 struct gspca_dev *gspca_dev = video_drvdata(file);
1282
1283 PDEBUG(D_STREAM, "[%s] close", current->comm);
1284
1285 /* Needed for gspca_stream_off, always lock before queue_lock! */
1286 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1287 return -ERESTARTSYS;
1288
1289 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1290 mutex_unlock(&gspca_dev->usb_lock);
1291 return -ERESTARTSYS;
1292 }
1293
1294 /* if the file did the capture, free the streaming resources */
1295 if (gspca_dev->capt_file == file) {
1296 if (gspca_dev->streaming)
1297 gspca_stream_off(gspca_dev);
1298 frame_free(gspca_dev);
1299 }
1300 module_put(gspca_dev->module);
1301 mutex_unlock(&gspca_dev->queue_lock);
1302 mutex_unlock(&gspca_dev->usb_lock);
1303
1304 PDEBUG(D_STREAM, "close done");
1305
1306 return v4l2_fh_release(file);
1307 }
1308
1309 static int vidioc_querycap(struct file *file, void *priv,
1310 struct v4l2_capability *cap)
1311 {
1312 struct gspca_dev *gspca_dev = video_drvdata(file);
1313
1314 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1315 sizeof cap->driver);
1316 if (gspca_dev->dev->product != NULL) {
1317 strlcpy((char *) cap->card, gspca_dev->dev->product,
1318 sizeof cap->card);
1319 } else {
1320 snprintf((char *) cap->card, sizeof cap->card,
1321 "USB Camera (%04x:%04x)",
1322 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1323 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1324 }
1325 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1326 sizeof(cap->bus_info));
1327 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1328 | V4L2_CAP_STREAMING
1329 | V4L2_CAP_READWRITE;
1330 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1331 return 0;
1332 }
1333
1334 static int vidioc_enum_input(struct file *file, void *priv,
1335 struct v4l2_input *input)
1336 {
1337 struct gspca_dev *gspca_dev = video_drvdata(file);
1338
1339 if (input->index != 0)
1340 return -EINVAL;
1341 input->type = V4L2_INPUT_TYPE_CAMERA;
1342 input->status = gspca_dev->cam.input_flags;
1343 strlcpy(input->name, gspca_dev->sd_desc->name,
1344 sizeof input->name);
1345 return 0;
1346 }
1347
1348 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1349 {
1350 *i = 0;
1351 return 0;
1352 }
1353
1354 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1355 {
1356 if (i > 0)
1357 return -EINVAL;
1358 return (0);
1359 }
1360
1361 static int vidioc_reqbufs(struct file *file, void *priv,
1362 struct v4l2_requestbuffers *rb)
1363 {
1364 struct gspca_dev *gspca_dev = video_drvdata(file);
1365 int i, ret = 0, streaming;
1366
1367 i = rb->memory; /* (avoid compilation warning) */
1368 switch (i) {
1369 case GSPCA_MEMORY_READ: /* (internal call) */
1370 case V4L2_MEMORY_MMAP:
1371 case V4L2_MEMORY_USERPTR:
1372 break;
1373 default:
1374 return -EINVAL;
1375 }
1376 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1377 return -ERESTARTSYS;
1378
1379 if (gspca_dev->memory != GSPCA_MEMORY_NO
1380 && gspca_dev->memory != GSPCA_MEMORY_READ
1381 && gspca_dev->memory != rb->memory) {
1382 ret = -EBUSY;
1383 goto out;
1384 }
1385
1386 /* only one file may do the capture */
1387 if (gspca_dev->capt_file != NULL
1388 && gspca_dev->capt_file != file) {
1389 ret = -EBUSY;
1390 goto out;
1391 }
1392
1393 /* if allocated, the buffers must not be mapped */
1394 for (i = 0; i < gspca_dev->nframes; i++) {
1395 if (gspca_dev->frame[i].vma_use_count) {
1396 ret = -EBUSY;
1397 goto out;
1398 }
1399 }
1400
1401 /* stop streaming */
1402 streaming = gspca_dev->streaming;
1403 if (streaming) {
1404 gspca_stream_off(gspca_dev);
1405
1406 /* Don't restart the stream when switching from read
1407 * to mmap mode */
1408 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1409 streaming = 0;
1410 }
1411
1412 /* free the previous allocated buffers, if any */
1413 if (gspca_dev->nframes != 0)
1414 frame_free(gspca_dev);
1415 if (rb->count == 0) /* unrequest */
1416 goto out;
1417 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1418 if (ret == 0) {
1419 rb->count = gspca_dev->nframes;
1420 if (streaming)
1421 ret = gspca_init_transfer(gspca_dev);
1422 }
1423 out:
1424 mutex_unlock(&gspca_dev->queue_lock);
1425 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1426 return ret;
1427 }
1428
1429 static int vidioc_querybuf(struct file *file, void *priv,
1430 struct v4l2_buffer *v4l2_buf)
1431 {
1432 struct gspca_dev *gspca_dev = video_drvdata(file);
1433 struct gspca_frame *frame;
1434
1435 if (v4l2_buf->index >= gspca_dev->nframes)
1436 return -EINVAL;
1437
1438 frame = &gspca_dev->frame[v4l2_buf->index];
1439 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1440 return 0;
1441 }
1442
1443 static int vidioc_streamon(struct file *file, void *priv,
1444 enum v4l2_buf_type buf_type)
1445 {
1446 struct gspca_dev *gspca_dev = video_drvdata(file);
1447 int ret;
1448
1449 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1450 return -EINVAL;
1451 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1452 return -ERESTARTSYS;
1453
1454 /* check the capture file */
1455 if (gspca_dev->capt_file != file) {
1456 ret = -EBUSY;
1457 goto out;
1458 }
1459
1460 if (gspca_dev->nframes == 0
1461 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1462 ret = -EINVAL;
1463 goto out;
1464 }
1465 if (!gspca_dev->streaming) {
1466 ret = gspca_init_transfer(gspca_dev);
1467 if (ret < 0)
1468 goto out;
1469 }
1470 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK", gspca_dev->pixfmt,
1471 gspca_dev->width, gspca_dev->height);
1472 ret = 0;
1473 out:
1474 mutex_unlock(&gspca_dev->queue_lock);
1475 return ret;
1476 }
1477
1478 static int vidioc_streamoff(struct file *file, void *priv,
1479 enum v4l2_buf_type buf_type)
1480 {
1481 struct gspca_dev *gspca_dev = video_drvdata(file);
1482 int i, ret;
1483
1484 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1485 return -EINVAL;
1486
1487 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1488 return -ERESTARTSYS;
1489
1490 if (!gspca_dev->streaming) {
1491 ret = 0;
1492 goto out;
1493 }
1494
1495 /* check the capture file */
1496 if (gspca_dev->capt_file != file) {
1497 ret = -EBUSY;
1498 goto out;
1499 }
1500
1501 /* stop streaming */
1502 gspca_stream_off(gspca_dev);
1503 /* In case another thread is waiting in dqbuf */
1504 wake_up_interruptible(&gspca_dev->wq);
1505
1506 /* empty the transfer queues */
1507 for (i = 0; i < gspca_dev->nframes; i++)
1508 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1509 atomic_set(&gspca_dev->fr_q, 0);
1510 atomic_set(&gspca_dev->fr_i, 0);
1511 gspca_dev->fr_o = 0;
1512 ret = 0;
1513 out:
1514 mutex_unlock(&gspca_dev->queue_lock);
1515 return ret;
1516 }
1517
1518 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1519 struct v4l2_jpegcompression *jpegcomp)
1520 {
1521 struct gspca_dev *gspca_dev = video_drvdata(file);
1522
1523 gspca_dev->usb_err = 0;
1524 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1525 }
1526
1527 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1528 const struct v4l2_jpegcompression *jpegcomp)
1529 {
1530 struct gspca_dev *gspca_dev = video_drvdata(file);
1531
1532 gspca_dev->usb_err = 0;
1533 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1534 }
1535
1536 static int vidioc_g_parm(struct file *filp, void *priv,
1537 struct v4l2_streamparm *parm)
1538 {
1539 struct gspca_dev *gspca_dev = video_drvdata(filp);
1540
1541 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1542
1543 if (gspca_dev->sd_desc->get_streamparm) {
1544 gspca_dev->usb_err = 0;
1545 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1546 return gspca_dev->usb_err;
1547 }
1548 return 0;
1549 }
1550
1551 static int vidioc_s_parm(struct file *filp, void *priv,
1552 struct v4l2_streamparm *parm)
1553 {
1554 struct gspca_dev *gspca_dev = video_drvdata(filp);
1555 int n;
1556
1557 n = parm->parm.capture.readbuffers;
1558 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1559 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1560 else
1561 gspca_dev->nbufread = n;
1562
1563 if (gspca_dev->sd_desc->set_streamparm) {
1564 gspca_dev->usb_err = 0;
1565 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1566 return gspca_dev->usb_err;
1567 }
1568
1569 return 0;
1570 }
1571
1572 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1573 {
1574 struct gspca_dev *gspca_dev = video_drvdata(file);
1575 struct gspca_frame *frame;
1576 struct page *page;
1577 unsigned long addr, start, size;
1578 int i, ret;
1579
1580 start = vma->vm_start;
1581 size = vma->vm_end - vma->vm_start;
1582 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1583
1584 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1585 return -ERESTARTSYS;
1586 if (gspca_dev->capt_file != file) {
1587 ret = -EINVAL;
1588 goto out;
1589 }
1590
1591 frame = NULL;
1592 for (i = 0; i < gspca_dev->nframes; ++i) {
1593 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1594 PDEBUG(D_STREAM, "mmap bad memory type");
1595 break;
1596 }
1597 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1598 == vma->vm_pgoff) {
1599 frame = &gspca_dev->frame[i];
1600 break;
1601 }
1602 }
1603 if (frame == NULL) {
1604 PDEBUG(D_STREAM, "mmap no frame buffer found");
1605 ret = -EINVAL;
1606 goto out;
1607 }
1608 if (size != frame->v4l2_buf.length) {
1609 PDEBUG(D_STREAM, "mmap bad size");
1610 ret = -EINVAL;
1611 goto out;
1612 }
1613
1614 /*
1615 * - VM_IO marks the area as being a mmaped region for I/O to a
1616 * device. It also prevents the region from being core dumped.
1617 */
1618 vma->vm_flags |= VM_IO;
1619
1620 addr = (unsigned long) frame->data;
1621 while (size > 0) {
1622 page = vmalloc_to_page((void *) addr);
1623 ret = vm_insert_page(vma, start, page);
1624 if (ret < 0)
1625 goto out;
1626 start += PAGE_SIZE;
1627 addr += PAGE_SIZE;
1628 size -= PAGE_SIZE;
1629 }
1630
1631 vma->vm_ops = &gspca_vm_ops;
1632 vma->vm_private_data = frame;
1633 gspca_vm_open(vma);
1634 ret = 0;
1635 out:
1636 mutex_unlock(&gspca_dev->queue_lock);
1637 return ret;
1638 }
1639
1640 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1641 enum v4l2_memory memory)
1642 {
1643 if (!gspca_dev->present)
1644 return -ENODEV;
1645 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1646 !gspca_dev->streaming)
1647 return -EINVAL;
1648
1649 /* check if a frame is ready */
1650 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1651 }
1652
1653 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1654 enum v4l2_memory memory)
1655 {
1656 int ret;
1657
1658 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1659 return -ERESTARTSYS;
1660 ret = frame_ready_nolock(gspca_dev, file, memory);
1661 mutex_unlock(&gspca_dev->queue_lock);
1662 return ret;
1663 }
1664
1665 /*
1666 * dequeue a video buffer
1667 *
1668 * If nonblock_ing is false, block until a buffer is available.
1669 */
1670 static int vidioc_dqbuf(struct file *file, void *priv,
1671 struct v4l2_buffer *v4l2_buf)
1672 {
1673 struct gspca_dev *gspca_dev = video_drvdata(file);
1674 struct gspca_frame *frame;
1675 int i, j, ret;
1676
1677 PDEBUG(D_FRAM, "dqbuf");
1678
1679 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1680 return -ERESTARTSYS;
1681
1682 for (;;) {
1683 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1684 if (ret < 0)
1685 goto out;
1686 if (ret > 0)
1687 break;
1688
1689 mutex_unlock(&gspca_dev->queue_lock);
1690
1691 if (file->f_flags & O_NONBLOCK)
1692 return -EAGAIN;
1693
1694 /* wait till a frame is ready */
1695 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1696 frame_ready(gspca_dev, file, v4l2_buf->memory),
1697 msecs_to_jiffies(3000));
1698 if (ret < 0)
1699 return ret;
1700 if (ret == 0)
1701 return -EIO;
1702
1703 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1704 return -ERESTARTSYS;
1705 }
1706
1707 i = gspca_dev->fr_o;
1708 j = gspca_dev->fr_queue[i];
1709 frame = &gspca_dev->frame[j];
1710
1711 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1712
1713 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1714 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1715 PDEBUG(D_FRAM, "dqbuf %d", j);
1716 ret = 0;
1717
1718 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1719 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1720 frame->data,
1721 frame->v4l2_buf.bytesused)) {
1722 PERR("dqbuf cp to user failed");
1723 ret = -EFAULT;
1724 }
1725 }
1726 out:
1727 mutex_unlock(&gspca_dev->queue_lock);
1728
1729 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1730 mutex_lock(&gspca_dev->usb_lock);
1731 gspca_dev->usb_err = 0;
1732 if (gspca_dev->present)
1733 gspca_dev->sd_desc->dq_callback(gspca_dev);
1734 mutex_unlock(&gspca_dev->usb_lock);
1735 }
1736
1737 return ret;
1738 }
1739
1740 /*
1741 * queue a video buffer
1742 *
1743 * Attempting to queue a buffer that has already been
1744 * queued will return -EINVAL.
1745 */
1746 static int vidioc_qbuf(struct file *file, void *priv,
1747 struct v4l2_buffer *v4l2_buf)
1748 {
1749 struct gspca_dev *gspca_dev = video_drvdata(file);
1750 struct gspca_frame *frame;
1751 int i, index, ret;
1752
1753 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1754
1755 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1756 return -ERESTARTSYS;
1757
1758 index = v4l2_buf->index;
1759 if ((unsigned) index >= gspca_dev->nframes) {
1760 PDEBUG(D_FRAM,
1761 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1762 ret = -EINVAL;
1763 goto out;
1764 }
1765 if (v4l2_buf->memory != gspca_dev->memory) {
1766 PDEBUG(D_FRAM, "qbuf bad memory type");
1767 ret = -EINVAL;
1768 goto out;
1769 }
1770
1771 frame = &gspca_dev->frame[index];
1772 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1773 PDEBUG(D_FRAM, "qbuf bad state");
1774 ret = -EINVAL;
1775 goto out;
1776 }
1777
1778 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1779
1780 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1781 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1782 frame->v4l2_buf.length = v4l2_buf->length;
1783 }
1784
1785 /* put the buffer in the 'queued' queue */
1786 i = atomic_read(&gspca_dev->fr_q);
1787 gspca_dev->fr_queue[i] = index;
1788 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1789
1790 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1791 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1792 ret = 0;
1793 out:
1794 mutex_unlock(&gspca_dev->queue_lock);
1795 return ret;
1796 }
1797
1798 /*
1799 * allocate the resources for read()
1800 */
1801 static int read_alloc(struct gspca_dev *gspca_dev,
1802 struct file *file)
1803 {
1804 struct v4l2_buffer v4l2_buf;
1805 int i, ret;
1806
1807 PDEBUG(D_STREAM, "read alloc");
1808
1809 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1810 return -ERESTARTSYS;
1811
1812 if (gspca_dev->nframes == 0) {
1813 struct v4l2_requestbuffers rb;
1814
1815 memset(&rb, 0, sizeof rb);
1816 rb.count = gspca_dev->nbufread;
1817 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1818 rb.memory = GSPCA_MEMORY_READ;
1819 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1820 if (ret != 0) {
1821 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1822 goto out;
1823 }
1824 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1825 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1826 v4l2_buf.memory = GSPCA_MEMORY_READ;
1827 for (i = 0; i < gspca_dev->nbufread; i++) {
1828 v4l2_buf.index = i;
1829 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1830 if (ret != 0) {
1831 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1832 goto out;
1833 }
1834 }
1835 }
1836
1837 /* start streaming */
1838 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1839 if (ret != 0)
1840 PDEBUG(D_STREAM, "read streamon err %d", ret);
1841 out:
1842 mutex_unlock(&gspca_dev->usb_lock);
1843 return ret;
1844 }
1845
1846 static unsigned int dev_poll(struct file *file, poll_table *wait)
1847 {
1848 struct gspca_dev *gspca_dev = video_drvdata(file);
1849 unsigned long req_events = poll_requested_events(wait);
1850 int ret = 0;
1851
1852 PDEBUG(D_FRAM, "poll");
1853
1854 if (req_events & POLLPRI)
1855 ret |= v4l2_ctrl_poll(file, wait);
1856
1857 if (req_events & (POLLIN | POLLRDNORM)) {
1858 /* if reqbufs is not done, the user would use read() */
1859 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1860 if (read_alloc(gspca_dev, file) != 0) {
1861 ret |= POLLERR;
1862 goto out;
1863 }
1864 }
1865
1866 poll_wait(file, &gspca_dev->wq, wait);
1867
1868 /* check if an image has been received */
1869 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1870 ret |= POLLERR;
1871 goto out;
1872 }
1873 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1874 ret |= POLLIN | POLLRDNORM;
1875 mutex_unlock(&gspca_dev->queue_lock);
1876 }
1877
1878 out:
1879 if (!gspca_dev->present)
1880 ret |= POLLHUP;
1881
1882 return ret;
1883 }
1884
1885 static ssize_t dev_read(struct file *file, char __user *data,
1886 size_t count, loff_t *ppos)
1887 {
1888 struct gspca_dev *gspca_dev = video_drvdata(file);
1889 struct gspca_frame *frame;
1890 struct v4l2_buffer v4l2_buf;
1891 struct timeval timestamp;
1892 int n, ret, ret2;
1893
1894 PDEBUG(D_FRAM, "read (%zd)", count);
1895 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1896 ret = read_alloc(gspca_dev, file);
1897 if (ret != 0)
1898 return ret;
1899 }
1900
1901 /* get a frame */
1902 timestamp = ktime_to_timeval(ktime_get());
1903 timestamp.tv_sec--;
1904 n = 2;
1905 for (;;) {
1906 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1907 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1908 v4l2_buf.memory = GSPCA_MEMORY_READ;
1909 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1910 if (ret != 0) {
1911 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1912 return ret;
1913 }
1914
1915 /* if the process slept for more than 1 second,
1916 * get a newer frame */
1917 frame = &gspca_dev->frame[v4l2_buf.index];
1918 if (--n < 0)
1919 break; /* avoid infinite loop */
1920 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1921 break;
1922 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1923 if (ret != 0) {
1924 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1925 return ret;
1926 }
1927 }
1928
1929 /* copy the frame */
1930 if (count > frame->v4l2_buf.bytesused)
1931 count = frame->v4l2_buf.bytesused;
1932 ret = copy_to_user(data, frame->data, count);
1933 if (ret != 0) {
1934 PERR("read cp to user lack %d / %zd", ret, count);
1935 ret = -EFAULT;
1936 goto out;
1937 }
1938 ret = count;
1939 out:
1940 /* in each case, requeue the buffer */
1941 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1942 if (ret2 != 0)
1943 return ret2;
1944 return ret;
1945 }
1946
1947 static struct v4l2_file_operations dev_fops = {
1948 .owner = THIS_MODULE,
1949 .open = dev_open,
1950 .release = dev_close,
1951 .read = dev_read,
1952 .mmap = dev_mmap,
1953 .unlocked_ioctl = video_ioctl2,
1954 .poll = dev_poll,
1955 };
1956
1957 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1958 .vidioc_querycap = vidioc_querycap,
1959 .vidioc_dqbuf = vidioc_dqbuf,
1960 .vidioc_qbuf = vidioc_qbuf,
1961 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1962 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1963 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1964 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1965 .vidioc_streamon = vidioc_streamon,
1966 .vidioc_enum_input = vidioc_enum_input,
1967 .vidioc_g_input = vidioc_g_input,
1968 .vidioc_s_input = vidioc_s_input,
1969 .vidioc_reqbufs = vidioc_reqbufs,
1970 .vidioc_querybuf = vidioc_querybuf,
1971 .vidioc_streamoff = vidioc_streamoff,
1972 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1973 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1974 .vidioc_g_parm = vidioc_g_parm,
1975 .vidioc_s_parm = vidioc_s_parm,
1976 .vidioc_enum_framesizes = vidioc_enum_framesizes,
1977 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1978 #ifdef CONFIG_VIDEO_ADV_DEBUG
1979 .vidioc_g_chip_info = vidioc_g_chip_info,
1980 .vidioc_g_register = vidioc_g_register,
1981 .vidioc_s_register = vidioc_s_register,
1982 #endif
1983 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1984 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1985 };
1986
1987 static const struct video_device gspca_template = {
1988 .name = "gspca main driver",
1989 .fops = &dev_fops,
1990 .ioctl_ops = &dev_ioctl_ops,
1991 .release = video_device_release_empty, /* We use v4l2_dev.release */
1992 };
1993
1994 /*
1995 * probe and create a new gspca device
1996 *
1997 * This function must be called by the sub-driver when it is
1998 * called for probing a new device.
1999 */
2000 int gspca_dev_probe2(struct usb_interface *intf,
2001 const struct usb_device_id *id,
2002 const struct sd_desc *sd_desc,
2003 int dev_size,
2004 struct module *module)
2005 {
2006 struct gspca_dev *gspca_dev;
2007 struct usb_device *dev = interface_to_usbdev(intf);
2008 int ret;
2009
2010 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2011 sd_desc->name, id->idVendor, id->idProduct);
2012
2013 /* create the device */
2014 if (dev_size < sizeof *gspca_dev)
2015 dev_size = sizeof *gspca_dev;
2016 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2017 if (!gspca_dev) {
2018 pr_err("couldn't kzalloc gspca struct\n");
2019 return -ENOMEM;
2020 }
2021 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2022 if (!gspca_dev->usb_buf) {
2023 pr_err("out of memory\n");
2024 ret = -ENOMEM;
2025 goto out;
2026 }
2027 gspca_dev->dev = dev;
2028 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2029
2030 /* check if any audio device */
2031 if (dev->actconfig->desc.bNumInterfaces != 1) {
2032 int i;
2033 struct usb_interface *intf2;
2034
2035 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2036 intf2 = dev->actconfig->interface[i];
2037 if (intf2 != NULL
2038 && intf2->altsetting != NULL
2039 && intf2->altsetting->desc.bInterfaceClass ==
2040 USB_CLASS_AUDIO) {
2041 gspca_dev->audio = 1;
2042 break;
2043 }
2044 }
2045 }
2046
2047 gspca_dev->v4l2_dev.release = gspca_release;
2048 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2049 if (ret)
2050 goto out;
2051 gspca_dev->sd_desc = sd_desc;
2052 gspca_dev->nbufread = 2;
2053 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2054 gspca_dev->vdev = gspca_template;
2055 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2056 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2057 set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2058 gspca_dev->module = module;
2059 gspca_dev->present = 1;
2060
2061 mutex_init(&gspca_dev->usb_lock);
2062 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2063 mutex_init(&gspca_dev->queue_lock);
2064 init_waitqueue_head(&gspca_dev->wq);
2065
2066 /* configure the subdriver and initialize the USB device */
2067 ret = sd_desc->config(gspca_dev, id);
2068 if (ret < 0)
2069 goto out;
2070 ret = sd_desc->init(gspca_dev);
2071 if (ret < 0)
2072 goto out;
2073 if (sd_desc->init_controls)
2074 ret = sd_desc->init_controls(gspca_dev);
2075 if (ret < 0)
2076 goto out;
2077 gspca_set_default_mode(gspca_dev);
2078
2079 ret = gspca_input_connect(gspca_dev);
2080 if (ret)
2081 goto out;
2082
2083 /*
2084 * Don't take usb_lock for these ioctls. This improves latency if
2085 * usb_lock is taken for a long time, e.g. when changing a control
2086 * value, and a new frame is ready to be dequeued.
2087 */
2088 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2089 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2090 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2091 #ifdef CONFIG_VIDEO_ADV_DEBUG
2092 if (!gspca_dev->sd_desc->get_register)
2093 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2094 if (!gspca_dev->sd_desc->set_register)
2095 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2096 #endif
2097 if (!gspca_dev->sd_desc->get_jcomp)
2098 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2099 if (!gspca_dev->sd_desc->set_jcomp)
2100 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2101
2102 /* init video stuff */
2103 ret = video_register_device(&gspca_dev->vdev,
2104 VFL_TYPE_GRABBER,
2105 -1);
2106 if (ret < 0) {
2107 pr_err("video_register_device err %d\n", ret);
2108 goto out;
2109 }
2110
2111 usb_set_intfdata(intf, gspca_dev);
2112 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2113
2114 gspca_input_create_urb(gspca_dev);
2115
2116 return 0;
2117 out:
2118 #if IS_ENABLED(CONFIG_INPUT)
2119 if (gspca_dev->input_dev)
2120 input_unregister_device(gspca_dev->input_dev);
2121 #endif
2122 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2123 kfree(gspca_dev->usb_buf);
2124 kfree(gspca_dev);
2125 return ret;
2126 }
2127 EXPORT_SYMBOL(gspca_dev_probe2);
2128
2129 /* same function as the previous one, but check the interface */
2130 int gspca_dev_probe(struct usb_interface *intf,
2131 const struct usb_device_id *id,
2132 const struct sd_desc *sd_desc,
2133 int dev_size,
2134 struct module *module)
2135 {
2136 struct usb_device *dev = interface_to_usbdev(intf);
2137
2138 /* we don't handle multi-config cameras */
2139 if (dev->descriptor.bNumConfigurations != 1) {
2140 pr_err("%04x:%04x too many config\n",
2141 id->idVendor, id->idProduct);
2142 return -ENODEV;
2143 }
2144
2145 /* the USB video interface must be the first one */
2146 if (dev->actconfig->desc.bNumInterfaces != 1
2147 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2148 return -ENODEV;
2149
2150 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2151 }
2152 EXPORT_SYMBOL(gspca_dev_probe);
2153
2154 /*
2155 * USB disconnection
2156 *
2157 * This function must be called by the sub-driver
2158 * when the device disconnects, after the specific resources are freed.
2159 */
2160 void gspca_disconnect(struct usb_interface *intf)
2161 {
2162 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2163 #if IS_ENABLED(CONFIG_INPUT)
2164 struct input_dev *input_dev;
2165 #endif
2166
2167 PDEBUG(D_PROBE, "%s disconnect",
2168 video_device_node_name(&gspca_dev->vdev));
2169
2170 mutex_lock(&gspca_dev->usb_lock);
2171
2172 gspca_dev->present = 0;
2173 destroy_urbs(gspca_dev);
2174
2175 #if IS_ENABLED(CONFIG_INPUT)
2176 gspca_input_destroy_urb(gspca_dev);
2177 input_dev = gspca_dev->input_dev;
2178 if (input_dev) {
2179 gspca_dev->input_dev = NULL;
2180 input_unregister_device(input_dev);
2181 }
2182 #endif
2183 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2184 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2185 gspca_dev->sd_desc->stop0(gspca_dev);
2186 gspca_dev->streaming = 0;
2187 gspca_dev->dev = NULL;
2188 wake_up_interruptible(&gspca_dev->wq);
2189
2190 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2191 video_unregister_device(&gspca_dev->vdev);
2192
2193 mutex_unlock(&gspca_dev->usb_lock);
2194
2195 /* (this will call gspca_release() immediately or on last close) */
2196 v4l2_device_put(&gspca_dev->v4l2_dev);
2197 }
2198 EXPORT_SYMBOL(gspca_disconnect);
2199
2200 #ifdef CONFIG_PM
2201 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2202 {
2203 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2204
2205 gspca_input_destroy_urb(gspca_dev);
2206
2207 if (!gspca_dev->streaming)
2208 return 0;
2209
2210 mutex_lock(&gspca_dev->usb_lock);
2211 gspca_dev->frozen = 1; /* avoid urb error messages */
2212 gspca_dev->usb_err = 0;
2213 if (gspca_dev->sd_desc->stopN)
2214 gspca_dev->sd_desc->stopN(gspca_dev);
2215 destroy_urbs(gspca_dev);
2216 gspca_set_alt0(gspca_dev);
2217 if (gspca_dev->sd_desc->stop0)
2218 gspca_dev->sd_desc->stop0(gspca_dev);
2219 mutex_unlock(&gspca_dev->usb_lock);
2220
2221 return 0;
2222 }
2223 EXPORT_SYMBOL(gspca_suspend);
2224
2225 int gspca_resume(struct usb_interface *intf)
2226 {
2227 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2228 int streaming, ret = 0;
2229
2230 mutex_lock(&gspca_dev->usb_lock);
2231 gspca_dev->frozen = 0;
2232 gspca_dev->usb_err = 0;
2233 gspca_dev->sd_desc->init(gspca_dev);
2234 /*
2235 * Most subdrivers send all ctrl values on sd_start and thus
2236 * only write to the device registers on s_ctrl when streaming ->
2237 * Clear streaming to avoid setting all ctrls twice.
2238 */
2239 streaming = gspca_dev->streaming;
2240 gspca_dev->streaming = 0;
2241 if (streaming)
2242 ret = gspca_init_transfer(gspca_dev);
2243 else
2244 gspca_input_create_urb(gspca_dev);
2245 mutex_unlock(&gspca_dev->usb_lock);
2246
2247 return ret;
2248 }
2249 EXPORT_SYMBOL(gspca_resume);
2250 #endif
2251
2252 /* -- module insert / remove -- */
2253 static int __init gspca_init(void)
2254 {
2255 pr_info("v" GSPCA_VERSION " registered\n");
2256 return 0;
2257 }
2258 static void __exit gspca_exit(void)
2259 {
2260 }
2261
2262 module_init(gspca_init);
2263 module_exit(gspca_exit);
2264
2265 module_param_named(debug, gspca_debug, int, 0644);
2266 MODULE_PARM_DESC(debug,
2267 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
CRIS linux kernel tree