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Merge remote-tracking branch 'omap_dss2/for-next'
[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 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 v4l2_get_timestamp(&frame->v4l2_buf.timestamp);
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 frsz = gspca_dev->pixfmt.sizeimage;
508 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
509 frsz = PAGE_ALIGN(frsz);
510 if (count >= GSPCA_MAX_FRAMES)
511 count = GSPCA_MAX_FRAMES - 1;
512 gspca_dev->frbuf = vmalloc_32(frsz * count);
513 if (!gspca_dev->frbuf) {
514 pr_err("frame alloc failed\n");
515 return -ENOMEM;
516 }
517 gspca_dev->capt_file = file;
518 gspca_dev->memory = memory;
519 gspca_dev->frsz = frsz;
520 gspca_dev->nframes = count;
521 for (i = 0; i < count; i++) {
522 frame = &gspca_dev->frame[i];
523 frame->v4l2_buf.index = i;
524 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
525 frame->v4l2_buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
526 frame->v4l2_buf.field = V4L2_FIELD_NONE;
527 frame->v4l2_buf.length = frsz;
528 frame->v4l2_buf.memory = memory;
529 frame->v4l2_buf.sequence = 0;
530 frame->data = gspca_dev->frbuf + i * frsz;
531 frame->v4l2_buf.m.offset = i * frsz;
532 }
533 atomic_set(&gspca_dev->fr_q, 0);
534 atomic_set(&gspca_dev->fr_i, 0);
535 gspca_dev->fr_o = 0;
536 return 0;
537 }
538
539 static void frame_free(struct gspca_dev *gspca_dev)
540 {
541 int i;
542
543 PDEBUG(D_STREAM, "frame free");
544 if (gspca_dev->frbuf != NULL) {
545 vfree(gspca_dev->frbuf);
546 gspca_dev->frbuf = NULL;
547 for (i = 0; i < gspca_dev->nframes; i++)
548 gspca_dev->frame[i].data = NULL;
549 }
550 gspca_dev->nframes = 0;
551 gspca_dev->frsz = 0;
552 gspca_dev->capt_file = NULL;
553 gspca_dev->memory = GSPCA_MEMORY_NO;
554 }
555
556 static void destroy_urbs(struct gspca_dev *gspca_dev)
557 {
558 struct urb *urb;
559 unsigned int i;
560
561 PDEBUG(D_STREAM, "kill transfer");
562 for (i = 0; i < MAX_NURBS; i++) {
563 urb = gspca_dev->urb[i];
564 if (urb == NULL)
565 break;
566
567 gspca_dev->urb[i] = NULL;
568 usb_kill_urb(urb);
569 usb_free_coherent(gspca_dev->dev,
570 urb->transfer_buffer_length,
571 urb->transfer_buffer,
572 urb->transfer_dma);
573 usb_free_urb(urb);
574 }
575 }
576
577 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
578 {
579 int ret;
580
581 if (gspca_dev->alt == 0)
582 return 0;
583 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
584 if (ret < 0)
585 pr_err("set alt 0 err %d\n", ret);
586 return ret;
587 }
588
589 /* Note: both the queue and the usb locks should be held when calling this */
590 static void gspca_stream_off(struct gspca_dev *gspca_dev)
591 {
592 gspca_dev->streaming = 0;
593 gspca_dev->usb_err = 0;
594 if (gspca_dev->sd_desc->stopN)
595 gspca_dev->sd_desc->stopN(gspca_dev);
596 destroy_urbs(gspca_dev);
597 gspca_input_destroy_urb(gspca_dev);
598 gspca_set_alt0(gspca_dev);
599 gspca_input_create_urb(gspca_dev);
600 if (gspca_dev->sd_desc->stop0)
601 gspca_dev->sd_desc->stop0(gspca_dev);
602 PDEBUG(D_STREAM, "stream off OK");
603 }
604
605 /*
606 * look for an input transfer endpoint in an alternate setting.
607 *
608 * If xfer_ep is invalid, return the first valid ep found, otherwise
609 * look for exactly the ep with address equal to xfer_ep.
610 */
611 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
612 int xfer, int xfer_ep)
613 {
614 struct usb_host_endpoint *ep;
615 int i, attr;
616
617 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
618 ep = &alt->endpoint[i];
619 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
620 if (attr == xfer
621 && ep->desc.wMaxPacketSize != 0
622 && usb_endpoint_dir_in(&ep->desc)
623 && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
624 return ep;
625 }
626 return NULL;
627 }
628
629 /* compute the minimum bandwidth for the current transfer */
630 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
631 {
632 u32 bandwidth;
633
634 /* get the (max) image size */
635 bandwidth = gspca_dev->pixfmt.sizeimage;
636
637 /* if the image is compressed, estimate its mean size */
638 if (!gspca_dev->cam.needs_full_bandwidth &&
639 bandwidth < gspca_dev->pixfmt.width *
640 gspca_dev->pixfmt.height)
641 bandwidth = bandwidth * 3 / 8; /* 0.375 */
642
643 /* estimate the frame rate */
644 if (gspca_dev->sd_desc->get_streamparm) {
645 struct v4l2_streamparm parm;
646
647 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
648 bandwidth *= parm.parm.capture.timeperframe.denominator;
649 bandwidth /= parm.parm.capture.timeperframe.numerator;
650 } else {
651
652 /* don't hope more than 15 fps with USB 1.1 and
653 * image resolution >= 640x480 */
654 if (gspca_dev->pixfmt.width >= 640
655 && gspca_dev->dev->speed == USB_SPEED_FULL)
656 bandwidth *= 15; /* 15 fps */
657 else
658 bandwidth *= 30; /* 30 fps */
659 }
660
661 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
662 return bandwidth;
663 }
664
665 /* endpoint table */
666 #define MAX_ALT 16
667 struct ep_tb_s {
668 u32 alt;
669 u32 bandwidth;
670 };
671
672 /*
673 * build the table of the endpoints
674 * and compute the minimum bandwidth for the image transfer
675 */
676 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
677 struct usb_interface *intf,
678 struct ep_tb_s *ep_tb)
679 {
680 struct usb_host_endpoint *ep;
681 int i, j, nbalt, psize, found;
682 u32 bandwidth, last_bw;
683
684 nbalt = intf->num_altsetting;
685 if (nbalt > MAX_ALT)
686 nbalt = MAX_ALT; /* fixme: should warn */
687
688 /* build the endpoint table */
689 i = 0;
690 last_bw = 0;
691 for (;;) {
692 ep_tb->bandwidth = 2000 * 2000 * 120;
693 found = 0;
694 for (j = 0; j < nbalt; j++) {
695 ep = alt_xfer(&intf->altsetting[j],
696 USB_ENDPOINT_XFER_ISOC,
697 gspca_dev->xfer_ep);
698 if (ep == NULL)
699 continue;
700 if (ep->desc.bInterval == 0) {
701 pr_err("alt %d iso endp with 0 interval\n", j);
702 continue;
703 }
704 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
705 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
706 bandwidth = psize * 1000;
707 if (gspca_dev->dev->speed == USB_SPEED_HIGH
708 || gspca_dev->dev->speed >= USB_SPEED_SUPER)
709 bandwidth *= 8;
710 bandwidth /= 1 << (ep->desc.bInterval - 1);
711 if (bandwidth <= last_bw)
712 continue;
713 if (bandwidth < ep_tb->bandwidth) {
714 ep_tb->bandwidth = bandwidth;
715 ep_tb->alt = j;
716 found = 1;
717 }
718 }
719 if (!found)
720 break;
721 PDEBUG(D_STREAM, "alt %d bandwidth %d",
722 ep_tb->alt, ep_tb->bandwidth);
723 last_bw = ep_tb->bandwidth;
724 i++;
725 ep_tb++;
726 }
727
728 /*
729 * If the camera:
730 * has a usb audio class interface (a built in usb mic); and
731 * is a usb 1 full speed device; and
732 * uses the max full speed iso bandwidth; and
733 * and has more than 1 alt setting
734 * then skip the highest alt setting to spare bandwidth for the mic
735 */
736 if (gspca_dev->audio &&
737 gspca_dev->dev->speed == USB_SPEED_FULL &&
738 last_bw >= 1000000 &&
739 i > 1) {
740 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
741 i--;
742 ep_tb--;
743 }
744
745 /* get the requested bandwidth and start at the highest atlsetting */
746 bandwidth = which_bandwidth(gspca_dev);
747 ep_tb--;
748 while (i > 1) {
749 ep_tb--;
750 if (ep_tb->bandwidth < bandwidth)
751 break;
752 i--;
753 }
754 return i;
755 }
756
757 /*
758 * create the URBs for image transfer
759 */
760 static int create_urbs(struct gspca_dev *gspca_dev,
761 struct usb_host_endpoint *ep)
762 {
763 struct urb *urb;
764 int n, nurbs, i, psize, npkt, bsize;
765
766 /* calculate the packet size and the number of packets */
767 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
768
769 if (!gspca_dev->cam.bulk) { /* isoc */
770
771 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
772 if (gspca_dev->pkt_size == 0)
773 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
774 else
775 psize = gspca_dev->pkt_size;
776 npkt = gspca_dev->cam.npkt;
777 if (npkt == 0)
778 npkt = 32; /* default value */
779 bsize = psize * npkt;
780 PDEBUG(D_STREAM,
781 "isoc %d pkts size %d = bsize:%d",
782 npkt, psize, bsize);
783 nurbs = DEF_NURBS;
784 } else { /* bulk */
785 npkt = 0;
786 bsize = gspca_dev->cam.bulk_size;
787 if (bsize == 0)
788 bsize = psize;
789 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
790 if (gspca_dev->cam.bulk_nurbs != 0)
791 nurbs = gspca_dev->cam.bulk_nurbs;
792 else
793 nurbs = 1;
794 }
795
796 for (n = 0; n < nurbs; n++) {
797 urb = usb_alloc_urb(npkt, GFP_KERNEL);
798 if (!urb)
799 return -ENOMEM;
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 gspca_dev->xfer_ep);
870 if (ep == NULL) {
871 pr_err("bad altsetting %d\n", gspca_dev->alt);
872 return -EIO;
873 }
874 ep_tb[0].alt = gspca_dev->alt;
875 alt_idx = 1;
876 } else {
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 gspca_dev->xfer_ep));
912 if (ret < 0) {
913 destroy_urbs(gspca_dev);
914 goto out;
915 }
916 }
917
918 /* clear the bulk endpoint */
919 if (gspca_dev->cam.bulk)
920 usb_clear_halt(gspca_dev->dev,
921 gspca_dev->urb[0]->pipe);
922
923 /* start the cam */
924 ret = gspca_dev->sd_desc->start(gspca_dev);
925 if (ret < 0) {
926 destroy_urbs(gspca_dev);
927 goto out;
928 }
929 gspca_dev->streaming = 1;
930 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
931
932 /* some bulk transfers are started by the subdriver */
933 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
934 break;
935
936 /* submit the URBs */
937 for (n = 0; n < MAX_NURBS; n++) {
938 urb = gspca_dev->urb[n];
939 if (urb == NULL)
940 break;
941 ret = usb_submit_urb(urb, GFP_KERNEL);
942 if (ret < 0)
943 break;
944 }
945 if (ret >= 0)
946 break; /* transfer is started */
947
948 /* something when wrong
949 * stop the webcam and free the transfer resources */
950 gspca_stream_off(gspca_dev);
951 if (ret != -ENOSPC) {
952 pr_err("usb_submit_urb alt %d err %d\n",
953 gspca_dev->alt, ret);
954 goto out;
955 }
956
957 /* the bandwidth is not wide enough
958 * negotiate or try a lower alternate setting */
959 retry:
960 PERR("alt %d - bandwidth not wide enough, trying again", alt);
961 msleep(20); /* wait for kill complete */
962 if (gspca_dev->sd_desc->isoc_nego) {
963 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
964 if (ret < 0)
965 goto out;
966 } else {
967 if (alt_idx <= 0) {
968 pr_err("no transfer endpoint found\n");
969 ret = -EIO;
970 goto out;
971 }
972 gspca_dev->alt = ep_tb[--alt_idx].alt;
973 }
974 }
975 out:
976 gspca_input_create_urb(gspca_dev);
977 return ret;
978 }
979
980 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
981 {
982 int i;
983
984 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
985 gspca_dev->curr_mode = i;
986 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
987
988 /* does nothing if ctrl_handler == NULL */
989 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
990 }
991
992 static int wxh_to_mode(struct gspca_dev *gspca_dev,
993 int width, int height)
994 {
995 int i;
996
997 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
998 if (width == gspca_dev->cam.cam_mode[i].width
999 && height == gspca_dev->cam.cam_mode[i].height)
1000 return i;
1001 }
1002 return -EINVAL;
1003 }
1004
1005 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
1006 int width, int height)
1007 {
1008 int i;
1009
1010 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1011 if (width >= gspca_dev->cam.cam_mode[i].width
1012 && height >= gspca_dev->cam.cam_mode[i].height)
1013 break;
1014 }
1015 return i;
1016 }
1017
1018 /*
1019 * search a mode with the right pixel format
1020 */
1021 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1022 int mode,
1023 int pixfmt)
1024 {
1025 int modeU, modeD;
1026
1027 modeU = modeD = mode;
1028 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1029 if (--modeD >= 0) {
1030 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1031 == pixfmt)
1032 return modeD;
1033 }
1034 if (++modeU < gspca_dev->cam.nmodes) {
1035 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1036 == pixfmt)
1037 return modeU;
1038 }
1039 }
1040 return -EINVAL;
1041 }
1042
1043 #ifdef CONFIG_VIDEO_ADV_DEBUG
1044 static int vidioc_g_chip_info(struct file *file, void *priv,
1045 struct v4l2_dbg_chip_info *chip)
1046 {
1047 struct gspca_dev *gspca_dev = video_drvdata(file);
1048
1049 gspca_dev->usb_err = 0;
1050 if (gspca_dev->sd_desc->get_chip_info)
1051 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1052 return chip->match.addr ? -EINVAL : 0;
1053 }
1054
1055 static int vidioc_g_register(struct file *file, void *priv,
1056 struct v4l2_dbg_register *reg)
1057 {
1058 struct gspca_dev *gspca_dev = video_drvdata(file);
1059
1060 gspca_dev->usb_err = 0;
1061 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1062 }
1063
1064 static int vidioc_s_register(struct file *file, void *priv,
1065 const struct v4l2_dbg_register *reg)
1066 {
1067 struct gspca_dev *gspca_dev = video_drvdata(file);
1068
1069 gspca_dev->usb_err = 0;
1070 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1071 }
1072 #endif
1073
1074 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1075 struct v4l2_fmtdesc *fmtdesc)
1076 {
1077 struct gspca_dev *gspca_dev = video_drvdata(file);
1078 int i, j, index;
1079 __u32 fmt_tb[8];
1080
1081 /* give an index to each format */
1082 index = 0;
1083 j = 0;
1084 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1085 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1086 j = 0;
1087 for (;;) {
1088 if (fmt_tb[j] == fmt_tb[index])
1089 break;
1090 j++;
1091 }
1092 if (j == index) {
1093 if (fmtdesc->index == index)
1094 break; /* new format */
1095 index++;
1096 if (index >= ARRAY_SIZE(fmt_tb))
1097 return -EINVAL;
1098 }
1099 }
1100 if (i < 0)
1101 return -EINVAL; /* no more format */
1102
1103 fmtdesc->pixelformat = fmt_tb[index];
1104 if (gspca_dev->cam.cam_mode[i].sizeimage <
1105 gspca_dev->cam.cam_mode[i].width *
1106 gspca_dev->cam.cam_mode[i].height)
1107 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1108 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1109 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1110 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1111 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1112 fmtdesc->description[4] = '\0';
1113 return 0;
1114 }
1115
1116 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1117 struct v4l2_format *fmt)
1118 {
1119 struct gspca_dev *gspca_dev = video_drvdata(file);
1120
1121 fmt->fmt.pix = gspca_dev->pixfmt;
1122 /* some drivers use priv internally, zero it before giving it back to
1123 the core */
1124 fmt->fmt.pix.priv = 0;
1125 return 0;
1126 }
1127
1128 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1129 struct v4l2_format *fmt)
1130 {
1131 int w, h, mode, mode2;
1132
1133 w = fmt->fmt.pix.width;
1134 h = fmt->fmt.pix.height;
1135
1136 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1137 fmt->fmt.pix.pixelformat, w, h);
1138
1139 /* search the nearest mode for width and height */
1140 mode = wxh_to_nearest_mode(gspca_dev, w, h);
1141
1142 /* OK if right palette */
1143 if (gspca_dev->cam.cam_mode[mode].pixelformat
1144 != fmt->fmt.pix.pixelformat) {
1145
1146 /* else, search the closest mode with the same pixel format */
1147 mode2 = gspca_get_mode(gspca_dev, mode,
1148 fmt->fmt.pix.pixelformat);
1149 if (mode2 >= 0)
1150 mode = mode2;
1151 }
1152 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1153 if (gspca_dev->sd_desc->try_fmt) {
1154 /* pass original resolution to subdriver try_fmt */
1155 fmt->fmt.pix.width = w;
1156 fmt->fmt.pix.height = h;
1157 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1158 }
1159 /* some drivers use priv internally, zero it before giving it back to
1160 the core */
1161 fmt->fmt.pix.priv = 0;
1162 return mode; /* used when s_fmt */
1163 }
1164
1165 static int vidioc_try_fmt_vid_cap(struct file *file,
1166 void *priv,
1167 struct v4l2_format *fmt)
1168 {
1169 struct gspca_dev *gspca_dev = video_drvdata(file);
1170 int ret;
1171
1172 ret = try_fmt_vid_cap(gspca_dev, fmt);
1173 if (ret < 0)
1174 return ret;
1175 return 0;
1176 }
1177
1178 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1179 struct v4l2_format *fmt)
1180 {
1181 struct gspca_dev *gspca_dev = video_drvdata(file);
1182 int ret;
1183
1184 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1185 return -ERESTARTSYS;
1186
1187 ret = try_fmt_vid_cap(gspca_dev, fmt);
1188 if (ret < 0)
1189 goto out;
1190
1191 if (gspca_dev->nframes != 0
1192 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1193 ret = -EINVAL;
1194 goto out;
1195 }
1196
1197 if (gspca_dev->streaming) {
1198 ret = -EBUSY;
1199 goto out;
1200 }
1201 gspca_dev->curr_mode = ret;
1202 if (gspca_dev->sd_desc->try_fmt)
1203 /* subdriver try_fmt can modify format parameters */
1204 gspca_dev->pixfmt = fmt->fmt.pix;
1205 else
1206 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1207
1208 ret = 0;
1209 out:
1210 mutex_unlock(&gspca_dev->queue_lock);
1211 return ret;
1212 }
1213
1214 static int vidioc_enum_framesizes(struct file *file, void *priv,
1215 struct v4l2_frmsizeenum *fsize)
1216 {
1217 struct gspca_dev *gspca_dev = video_drvdata(file);
1218 int i;
1219 __u32 index = 0;
1220
1221 if (gspca_dev->sd_desc->enum_framesizes)
1222 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1223
1224 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1225 if (fsize->pixel_format !=
1226 gspca_dev->cam.cam_mode[i].pixelformat)
1227 continue;
1228
1229 if (fsize->index == index) {
1230 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1231 fsize->discrete.width =
1232 gspca_dev->cam.cam_mode[i].width;
1233 fsize->discrete.height =
1234 gspca_dev->cam.cam_mode[i].height;
1235 return 0;
1236 }
1237 index++;
1238 }
1239
1240 return -EINVAL;
1241 }
1242
1243 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1244 struct v4l2_frmivalenum *fival)
1245 {
1246 struct gspca_dev *gspca_dev = video_drvdata(filp);
1247 int mode;
1248 __u32 i;
1249
1250 mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1251 if (mode < 0)
1252 return -EINVAL;
1253
1254 if (gspca_dev->cam.mode_framerates == NULL ||
1255 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1256 return -EINVAL;
1257
1258 if (fival->pixel_format !=
1259 gspca_dev->cam.cam_mode[mode].pixelformat)
1260 return -EINVAL;
1261
1262 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1263 if (fival->index == i) {
1264 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1265 fival->discrete.numerator = 1;
1266 fival->discrete.denominator =
1267 gspca_dev->cam.mode_framerates[mode].rates[i];
1268 return 0;
1269 }
1270 }
1271
1272 return -EINVAL;
1273 }
1274
1275 static void gspca_release(struct v4l2_device *v4l2_device)
1276 {
1277 struct gspca_dev *gspca_dev =
1278 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1279
1280 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1281 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1282 kfree(gspca_dev->usb_buf);
1283 kfree(gspca_dev);
1284 }
1285
1286 static int dev_open(struct file *file)
1287 {
1288 struct gspca_dev *gspca_dev = video_drvdata(file);
1289 int ret;
1290
1291 PDEBUG(D_STREAM, "[%s] open", current->comm);
1292
1293 /* protect the subdriver against rmmod */
1294 if (!try_module_get(gspca_dev->module))
1295 return -ENODEV;
1296
1297 ret = v4l2_fh_open(file);
1298 if (ret)
1299 module_put(gspca_dev->module);
1300 return ret;
1301 }
1302
1303 static int dev_close(struct file *file)
1304 {
1305 struct gspca_dev *gspca_dev = video_drvdata(file);
1306
1307 PDEBUG(D_STREAM, "[%s] close", current->comm);
1308
1309 /* Needed for gspca_stream_off, always lock before queue_lock! */
1310 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1311 return -ERESTARTSYS;
1312
1313 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1314 mutex_unlock(&gspca_dev->usb_lock);
1315 return -ERESTARTSYS;
1316 }
1317
1318 /* if the file did the capture, free the streaming resources */
1319 if (gspca_dev->capt_file == file) {
1320 if (gspca_dev->streaming)
1321 gspca_stream_off(gspca_dev);
1322 frame_free(gspca_dev);
1323 }
1324 module_put(gspca_dev->module);
1325 mutex_unlock(&gspca_dev->queue_lock);
1326 mutex_unlock(&gspca_dev->usb_lock);
1327
1328 PDEBUG(D_STREAM, "close done");
1329
1330 return v4l2_fh_release(file);
1331 }
1332
1333 static int vidioc_querycap(struct file *file, void *priv,
1334 struct v4l2_capability *cap)
1335 {
1336 struct gspca_dev *gspca_dev = video_drvdata(file);
1337
1338 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1339 sizeof cap->driver);
1340 if (gspca_dev->dev->product != NULL) {
1341 strlcpy((char *) cap->card, gspca_dev->dev->product,
1342 sizeof cap->card);
1343 } else {
1344 snprintf((char *) cap->card, sizeof cap->card,
1345 "USB Camera (%04x:%04x)",
1346 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1347 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1348 }
1349 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1350 sizeof(cap->bus_info));
1351 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1352 | V4L2_CAP_STREAMING
1353 | V4L2_CAP_READWRITE;
1354 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1355 return 0;
1356 }
1357
1358 static int vidioc_enum_input(struct file *file, void *priv,
1359 struct v4l2_input *input)
1360 {
1361 struct gspca_dev *gspca_dev = video_drvdata(file);
1362
1363 if (input->index != 0)
1364 return -EINVAL;
1365 input->type = V4L2_INPUT_TYPE_CAMERA;
1366 input->status = gspca_dev->cam.input_flags;
1367 strlcpy(input->name, gspca_dev->sd_desc->name,
1368 sizeof input->name);
1369 return 0;
1370 }
1371
1372 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1373 {
1374 *i = 0;
1375 return 0;
1376 }
1377
1378 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1379 {
1380 if (i > 0)
1381 return -EINVAL;
1382 return (0);
1383 }
1384
1385 static int vidioc_reqbufs(struct file *file, void *priv,
1386 struct v4l2_requestbuffers *rb)
1387 {
1388 struct gspca_dev *gspca_dev = video_drvdata(file);
1389 int i, ret = 0, streaming;
1390
1391 i = rb->memory; /* (avoid compilation warning) */
1392 switch (i) {
1393 case GSPCA_MEMORY_READ: /* (internal call) */
1394 case V4L2_MEMORY_MMAP:
1395 case V4L2_MEMORY_USERPTR:
1396 break;
1397 default:
1398 return -EINVAL;
1399 }
1400 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1401 return -ERESTARTSYS;
1402
1403 if (gspca_dev->memory != GSPCA_MEMORY_NO
1404 && gspca_dev->memory != GSPCA_MEMORY_READ
1405 && gspca_dev->memory != rb->memory) {
1406 ret = -EBUSY;
1407 goto out;
1408 }
1409
1410 /* only one file may do the capture */
1411 if (gspca_dev->capt_file != NULL
1412 && gspca_dev->capt_file != file) {
1413 ret = -EBUSY;
1414 goto out;
1415 }
1416
1417 /* if allocated, the buffers must not be mapped */
1418 for (i = 0; i < gspca_dev->nframes; i++) {
1419 if (gspca_dev->frame[i].vma_use_count) {
1420 ret = -EBUSY;
1421 goto out;
1422 }
1423 }
1424
1425 /* stop streaming */
1426 streaming = gspca_dev->streaming;
1427 if (streaming) {
1428 gspca_stream_off(gspca_dev);
1429
1430 /* Don't restart the stream when switching from read
1431 * to mmap mode */
1432 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1433 streaming = 0;
1434 }
1435
1436 /* free the previous allocated buffers, if any */
1437 if (gspca_dev->nframes != 0)
1438 frame_free(gspca_dev);
1439 if (rb->count == 0) /* unrequest */
1440 goto out;
1441 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1442 if (ret == 0) {
1443 rb->count = gspca_dev->nframes;
1444 if (streaming)
1445 ret = gspca_init_transfer(gspca_dev);
1446 }
1447 out:
1448 mutex_unlock(&gspca_dev->queue_lock);
1449 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1450 return ret;
1451 }
1452
1453 static int vidioc_querybuf(struct file *file, void *priv,
1454 struct v4l2_buffer *v4l2_buf)
1455 {
1456 struct gspca_dev *gspca_dev = video_drvdata(file);
1457 struct gspca_frame *frame;
1458
1459 if (v4l2_buf->index >= gspca_dev->nframes)
1460 return -EINVAL;
1461
1462 frame = &gspca_dev->frame[v4l2_buf->index];
1463 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1464 return 0;
1465 }
1466
1467 static int vidioc_streamon(struct file *file, void *priv,
1468 enum v4l2_buf_type buf_type)
1469 {
1470 struct gspca_dev *gspca_dev = video_drvdata(file);
1471 int ret;
1472
1473 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1474 return -EINVAL;
1475 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1476 return -ERESTARTSYS;
1477
1478 /* check the capture file */
1479 if (gspca_dev->capt_file != file) {
1480 ret = -EBUSY;
1481 goto out;
1482 }
1483
1484 if (gspca_dev->nframes == 0
1485 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1486 ret = -EINVAL;
1487 goto out;
1488 }
1489 if (!gspca_dev->streaming) {
1490 ret = gspca_init_transfer(gspca_dev);
1491 if (ret < 0)
1492 goto out;
1493 }
1494 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1495 gspca_dev->pixfmt.pixelformat,
1496 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1497 ret = 0;
1498 out:
1499 mutex_unlock(&gspca_dev->queue_lock);
1500 return ret;
1501 }
1502
1503 static int vidioc_streamoff(struct file *file, void *priv,
1504 enum v4l2_buf_type buf_type)
1505 {
1506 struct gspca_dev *gspca_dev = video_drvdata(file);
1507 int i, ret;
1508
1509 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1510 return -EINVAL;
1511
1512 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1513 return -ERESTARTSYS;
1514
1515 if (!gspca_dev->streaming) {
1516 ret = 0;
1517 goto out;
1518 }
1519
1520 /* check the capture file */
1521 if (gspca_dev->capt_file != file) {
1522 ret = -EBUSY;
1523 goto out;
1524 }
1525
1526 /* stop streaming */
1527 gspca_stream_off(gspca_dev);
1528 /* In case another thread is waiting in dqbuf */
1529 wake_up_interruptible(&gspca_dev->wq);
1530
1531 /* empty the transfer queues */
1532 for (i = 0; i < gspca_dev->nframes; i++)
1533 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1534 atomic_set(&gspca_dev->fr_q, 0);
1535 atomic_set(&gspca_dev->fr_i, 0);
1536 gspca_dev->fr_o = 0;
1537 ret = 0;
1538 out:
1539 mutex_unlock(&gspca_dev->queue_lock);
1540 return ret;
1541 }
1542
1543 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1544 struct v4l2_jpegcompression *jpegcomp)
1545 {
1546 struct gspca_dev *gspca_dev = video_drvdata(file);
1547
1548 gspca_dev->usb_err = 0;
1549 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1550 }
1551
1552 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1553 const struct v4l2_jpegcompression *jpegcomp)
1554 {
1555 struct gspca_dev *gspca_dev = video_drvdata(file);
1556
1557 gspca_dev->usb_err = 0;
1558 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1559 }
1560
1561 static int vidioc_g_parm(struct file *filp, void *priv,
1562 struct v4l2_streamparm *parm)
1563 {
1564 struct gspca_dev *gspca_dev = video_drvdata(filp);
1565
1566 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1567
1568 if (gspca_dev->sd_desc->get_streamparm) {
1569 gspca_dev->usb_err = 0;
1570 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1571 return gspca_dev->usb_err;
1572 }
1573 return 0;
1574 }
1575
1576 static int vidioc_s_parm(struct file *filp, void *priv,
1577 struct v4l2_streamparm *parm)
1578 {
1579 struct gspca_dev *gspca_dev = video_drvdata(filp);
1580 unsigned int n;
1581
1582 n = parm->parm.capture.readbuffers;
1583 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1584 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1585 else
1586 gspca_dev->nbufread = n;
1587
1588 if (gspca_dev->sd_desc->set_streamparm) {
1589 gspca_dev->usb_err = 0;
1590 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1591 return gspca_dev->usb_err;
1592 }
1593
1594 return 0;
1595 }
1596
1597 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1598 {
1599 struct gspca_dev *gspca_dev = video_drvdata(file);
1600 struct gspca_frame *frame;
1601 struct page *page;
1602 unsigned long addr, start, size;
1603 int i, ret;
1604
1605 start = vma->vm_start;
1606 size = vma->vm_end - vma->vm_start;
1607 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1608
1609 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1610 return -ERESTARTSYS;
1611 if (gspca_dev->capt_file != file) {
1612 ret = -EINVAL;
1613 goto out;
1614 }
1615
1616 frame = NULL;
1617 for (i = 0; i < gspca_dev->nframes; ++i) {
1618 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1619 PDEBUG(D_STREAM, "mmap bad memory type");
1620 break;
1621 }
1622 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1623 == vma->vm_pgoff) {
1624 frame = &gspca_dev->frame[i];
1625 break;
1626 }
1627 }
1628 if (frame == NULL) {
1629 PDEBUG(D_STREAM, "mmap no frame buffer found");
1630 ret = -EINVAL;
1631 goto out;
1632 }
1633 if (size != frame->v4l2_buf.length) {
1634 PDEBUG(D_STREAM, "mmap bad size");
1635 ret = -EINVAL;
1636 goto out;
1637 }
1638
1639 /*
1640 * - VM_IO marks the area as being a mmaped region for I/O to a
1641 * device. It also prevents the region from being core dumped.
1642 */
1643 vma->vm_flags |= VM_IO;
1644
1645 addr = (unsigned long) frame->data;
1646 while (size > 0) {
1647 page = vmalloc_to_page((void *) addr);
1648 ret = vm_insert_page(vma, start, page);
1649 if (ret < 0)
1650 goto out;
1651 start += PAGE_SIZE;
1652 addr += PAGE_SIZE;
1653 size -= PAGE_SIZE;
1654 }
1655
1656 vma->vm_ops = &gspca_vm_ops;
1657 vma->vm_private_data = frame;
1658 gspca_vm_open(vma);
1659 ret = 0;
1660 out:
1661 mutex_unlock(&gspca_dev->queue_lock);
1662 return ret;
1663 }
1664
1665 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1666 enum v4l2_memory memory)
1667 {
1668 if (!gspca_dev->present)
1669 return -ENODEV;
1670 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1671 !gspca_dev->streaming)
1672 return -EINVAL;
1673
1674 /* check if a frame is ready */
1675 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1676 }
1677
1678 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1679 enum v4l2_memory memory)
1680 {
1681 int ret;
1682
1683 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1684 return -ERESTARTSYS;
1685 ret = frame_ready_nolock(gspca_dev, file, memory);
1686 mutex_unlock(&gspca_dev->queue_lock);
1687 return ret;
1688 }
1689
1690 /*
1691 * dequeue a video buffer
1692 *
1693 * If nonblock_ing is false, block until a buffer is available.
1694 */
1695 static int vidioc_dqbuf(struct file *file, void *priv,
1696 struct v4l2_buffer *v4l2_buf)
1697 {
1698 struct gspca_dev *gspca_dev = video_drvdata(file);
1699 struct gspca_frame *frame;
1700 int i, j, ret;
1701
1702 PDEBUG(D_FRAM, "dqbuf");
1703
1704 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1705 return -ERESTARTSYS;
1706
1707 for (;;) {
1708 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1709 if (ret < 0)
1710 goto out;
1711 if (ret > 0)
1712 break;
1713
1714 mutex_unlock(&gspca_dev->queue_lock);
1715
1716 if (file->f_flags & O_NONBLOCK)
1717 return -EAGAIN;
1718
1719 /* wait till a frame is ready */
1720 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1721 frame_ready(gspca_dev, file, v4l2_buf->memory),
1722 msecs_to_jiffies(3000));
1723 if (ret < 0)
1724 return ret;
1725 if (ret == 0)
1726 return -EIO;
1727
1728 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1729 return -ERESTARTSYS;
1730 }
1731
1732 i = gspca_dev->fr_o;
1733 j = gspca_dev->fr_queue[i];
1734 frame = &gspca_dev->frame[j];
1735
1736 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1737
1738 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1739 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1740 PDEBUG(D_FRAM, "dqbuf %d", j);
1741 ret = 0;
1742
1743 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1744 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1745 frame->data,
1746 frame->v4l2_buf.bytesused)) {
1747 PERR("dqbuf cp to user failed");
1748 ret = -EFAULT;
1749 }
1750 }
1751 out:
1752 mutex_unlock(&gspca_dev->queue_lock);
1753
1754 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1755 mutex_lock(&gspca_dev->usb_lock);
1756 gspca_dev->usb_err = 0;
1757 if (gspca_dev->present)
1758 gspca_dev->sd_desc->dq_callback(gspca_dev);
1759 mutex_unlock(&gspca_dev->usb_lock);
1760 }
1761
1762 return ret;
1763 }
1764
1765 /*
1766 * queue a video buffer
1767 *
1768 * Attempting to queue a buffer that has already been
1769 * queued will return -EINVAL.
1770 */
1771 static int vidioc_qbuf(struct file *file, void *priv,
1772 struct v4l2_buffer *v4l2_buf)
1773 {
1774 struct gspca_dev *gspca_dev = video_drvdata(file);
1775 struct gspca_frame *frame;
1776 int i, index, ret;
1777
1778 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1779
1780 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1781 return -ERESTARTSYS;
1782
1783 index = v4l2_buf->index;
1784 if ((unsigned) index >= gspca_dev->nframes) {
1785 PDEBUG(D_FRAM,
1786 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1787 ret = -EINVAL;
1788 goto out;
1789 }
1790 if (v4l2_buf->memory != gspca_dev->memory) {
1791 PDEBUG(D_FRAM, "qbuf bad memory type");
1792 ret = -EINVAL;
1793 goto out;
1794 }
1795
1796 frame = &gspca_dev->frame[index];
1797 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1798 PDEBUG(D_FRAM, "qbuf bad state");
1799 ret = -EINVAL;
1800 goto out;
1801 }
1802
1803 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1804
1805 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1806 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1807 frame->v4l2_buf.length = v4l2_buf->length;
1808 }
1809
1810 /* put the buffer in the 'queued' queue */
1811 i = atomic_read(&gspca_dev->fr_q);
1812 gspca_dev->fr_queue[i] = index;
1813 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1814
1815 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1816 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1817 ret = 0;
1818 out:
1819 mutex_unlock(&gspca_dev->queue_lock);
1820 return ret;
1821 }
1822
1823 /*
1824 * allocate the resources for read()
1825 */
1826 static int read_alloc(struct gspca_dev *gspca_dev,
1827 struct file *file)
1828 {
1829 struct v4l2_buffer v4l2_buf;
1830 int i, ret;
1831
1832 PDEBUG(D_STREAM, "read alloc");
1833
1834 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1835 return -ERESTARTSYS;
1836
1837 if (gspca_dev->nframes == 0) {
1838 struct v4l2_requestbuffers rb;
1839
1840 memset(&rb, 0, sizeof rb);
1841 rb.count = gspca_dev->nbufread;
1842 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1843 rb.memory = GSPCA_MEMORY_READ;
1844 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1845 if (ret != 0) {
1846 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1847 goto out;
1848 }
1849 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1850 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1851 v4l2_buf.memory = GSPCA_MEMORY_READ;
1852 for (i = 0; i < gspca_dev->nbufread; i++) {
1853 v4l2_buf.index = i;
1854 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1855 if (ret != 0) {
1856 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1857 goto out;
1858 }
1859 }
1860 }
1861
1862 /* start streaming */
1863 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1864 if (ret != 0)
1865 PDEBUG(D_STREAM, "read streamon err %d", ret);
1866 out:
1867 mutex_unlock(&gspca_dev->usb_lock);
1868 return ret;
1869 }
1870
1871 static unsigned int dev_poll(struct file *file, poll_table *wait)
1872 {
1873 struct gspca_dev *gspca_dev = video_drvdata(file);
1874 unsigned long req_events = poll_requested_events(wait);
1875 int ret = 0;
1876
1877 PDEBUG(D_FRAM, "poll");
1878
1879 if (req_events & POLLPRI)
1880 ret |= v4l2_ctrl_poll(file, wait);
1881
1882 if (req_events & (POLLIN | POLLRDNORM)) {
1883 /* if reqbufs is not done, the user would use read() */
1884 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1885 if (read_alloc(gspca_dev, file) != 0) {
1886 ret |= POLLERR;
1887 goto out;
1888 }
1889 }
1890
1891 poll_wait(file, &gspca_dev->wq, wait);
1892
1893 /* check if an image has been received */
1894 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1895 ret |= POLLERR;
1896 goto out;
1897 }
1898 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1899 ret |= POLLIN | POLLRDNORM;
1900 mutex_unlock(&gspca_dev->queue_lock);
1901 }
1902
1903 out:
1904 if (!gspca_dev->present)
1905 ret |= POLLHUP;
1906
1907 return ret;
1908 }
1909
1910 static ssize_t dev_read(struct file *file, char __user *data,
1911 size_t count, loff_t *ppos)
1912 {
1913 struct gspca_dev *gspca_dev = video_drvdata(file);
1914 struct gspca_frame *frame;
1915 struct v4l2_buffer v4l2_buf;
1916 struct timeval timestamp;
1917 int n, ret, ret2;
1918
1919 PDEBUG(D_FRAM, "read (%zd)", count);
1920 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1921 ret = read_alloc(gspca_dev, file);
1922 if (ret != 0)
1923 return ret;
1924 }
1925
1926 /* get a frame */
1927 v4l2_get_timestamp(&timestamp);
1928 timestamp.tv_sec--;
1929 n = 2;
1930 for (;;) {
1931 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1932 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1933 v4l2_buf.memory = GSPCA_MEMORY_READ;
1934 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1935 if (ret != 0) {
1936 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1937 return ret;
1938 }
1939
1940 /* if the process slept for more than 1 second,
1941 * get a newer frame */
1942 frame = &gspca_dev->frame[v4l2_buf.index];
1943 if (--n < 0)
1944 break; /* avoid infinite loop */
1945 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1946 break;
1947 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1948 if (ret != 0) {
1949 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1950 return ret;
1951 }
1952 }
1953
1954 /* copy the frame */
1955 if (count > frame->v4l2_buf.bytesused)
1956 count = frame->v4l2_buf.bytesused;
1957 ret = copy_to_user(data, frame->data, count);
1958 if (ret != 0) {
1959 PERR("read cp to user lack %d / %zd", ret, count);
1960 ret = -EFAULT;
1961 goto out;
1962 }
1963 ret = count;
1964 out:
1965 /* in each case, requeue the buffer */
1966 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1967 if (ret2 != 0)
1968 return ret2;
1969 return ret;
1970 }
1971
1972 static struct v4l2_file_operations dev_fops = {
1973 .owner = THIS_MODULE,
1974 .open = dev_open,
1975 .release = dev_close,
1976 .read = dev_read,
1977 .mmap = dev_mmap,
1978 .unlocked_ioctl = video_ioctl2,
1979 .poll = dev_poll,
1980 };
1981
1982 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1983 .vidioc_querycap = vidioc_querycap,
1984 .vidioc_dqbuf = vidioc_dqbuf,
1985 .vidioc_qbuf = vidioc_qbuf,
1986 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1987 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1988 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1989 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1990 .vidioc_streamon = vidioc_streamon,
1991 .vidioc_enum_input = vidioc_enum_input,
1992 .vidioc_g_input = vidioc_g_input,
1993 .vidioc_s_input = vidioc_s_input,
1994 .vidioc_reqbufs = vidioc_reqbufs,
1995 .vidioc_querybuf = vidioc_querybuf,
1996 .vidioc_streamoff = vidioc_streamoff,
1997 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1998 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1999 .vidioc_g_parm = vidioc_g_parm,
2000 .vidioc_s_parm = vidioc_s_parm,
2001 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2002 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2003 #ifdef CONFIG_VIDEO_ADV_DEBUG
2004 .vidioc_g_chip_info = vidioc_g_chip_info,
2005 .vidioc_g_register = vidioc_g_register,
2006 .vidioc_s_register = vidioc_s_register,
2007 #endif
2008 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2009 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2010 };
2011
2012 static const struct video_device gspca_template = {
2013 .name = "gspca main driver",
2014 .fops = &dev_fops,
2015 .ioctl_ops = &dev_ioctl_ops,
2016 .release = video_device_release_empty, /* We use v4l2_dev.release */
2017 };
2018
2019 /*
2020 * probe and create a new gspca device
2021 *
2022 * This function must be called by the sub-driver when it is
2023 * called for probing a new device.
2024 */
2025 int gspca_dev_probe2(struct usb_interface *intf,
2026 const struct usb_device_id *id,
2027 const struct sd_desc *sd_desc,
2028 int dev_size,
2029 struct module *module)
2030 {
2031 struct gspca_dev *gspca_dev;
2032 struct usb_device *dev = interface_to_usbdev(intf);
2033 int ret;
2034
2035 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2036 sd_desc->name, id->idVendor, id->idProduct);
2037
2038 /* create the device */
2039 if (dev_size < sizeof *gspca_dev)
2040 dev_size = sizeof *gspca_dev;
2041 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2042 if (!gspca_dev) {
2043 pr_err("couldn't kzalloc gspca struct\n");
2044 return -ENOMEM;
2045 }
2046 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2047 if (!gspca_dev->usb_buf) {
2048 pr_err("out of memory\n");
2049 ret = -ENOMEM;
2050 goto out;
2051 }
2052 gspca_dev->dev = dev;
2053 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2054 gspca_dev->xfer_ep = -1;
2055
2056 /* check if any audio device */
2057 if (dev->actconfig->desc.bNumInterfaces != 1) {
2058 int i;
2059 struct usb_interface *intf2;
2060
2061 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2062 intf2 = dev->actconfig->interface[i];
2063 if (intf2 != NULL
2064 && intf2->altsetting != NULL
2065 && intf2->altsetting->desc.bInterfaceClass ==
2066 USB_CLASS_AUDIO) {
2067 gspca_dev->audio = 1;
2068 break;
2069 }
2070 }
2071 }
2072
2073 gspca_dev->v4l2_dev.release = gspca_release;
2074 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2075 if (ret)
2076 goto out;
2077 gspca_dev->sd_desc = sd_desc;
2078 gspca_dev->nbufread = 2;
2079 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2080 gspca_dev->vdev = gspca_template;
2081 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2082 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2083 gspca_dev->module = module;
2084 gspca_dev->present = 1;
2085
2086 mutex_init(&gspca_dev->usb_lock);
2087 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2088 mutex_init(&gspca_dev->queue_lock);
2089 init_waitqueue_head(&gspca_dev->wq);
2090
2091 /* configure the subdriver and initialize the USB device */
2092 ret = sd_desc->config(gspca_dev, id);
2093 if (ret < 0)
2094 goto out;
2095 ret = sd_desc->init(gspca_dev);
2096 if (ret < 0)
2097 goto out;
2098 if (sd_desc->init_controls)
2099 ret = sd_desc->init_controls(gspca_dev);
2100 if (ret < 0)
2101 goto out;
2102 gspca_set_default_mode(gspca_dev);
2103
2104 ret = gspca_input_connect(gspca_dev);
2105 if (ret)
2106 goto out;
2107
2108 /*
2109 * Don't take usb_lock for these ioctls. This improves latency if
2110 * usb_lock is taken for a long time, e.g. when changing a control
2111 * value, and a new frame is ready to be dequeued.
2112 */
2113 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2114 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2115 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2116 #ifdef CONFIG_VIDEO_ADV_DEBUG
2117 if (!gspca_dev->sd_desc->get_register)
2118 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2119 if (!gspca_dev->sd_desc->set_register)
2120 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2121 #endif
2122 if (!gspca_dev->sd_desc->get_jcomp)
2123 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2124 if (!gspca_dev->sd_desc->set_jcomp)
2125 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2126
2127 /* init video stuff */
2128 ret = video_register_device(&gspca_dev->vdev,
2129 VFL_TYPE_GRABBER,
2130 -1);
2131 if (ret < 0) {
2132 pr_err("video_register_device err %d\n", ret);
2133 goto out;
2134 }
2135
2136 usb_set_intfdata(intf, gspca_dev);
2137 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2138
2139 gspca_input_create_urb(gspca_dev);
2140
2141 return 0;
2142 out:
2143 #if IS_ENABLED(CONFIG_INPUT)
2144 if (gspca_dev->input_dev)
2145 input_unregister_device(gspca_dev->input_dev);
2146 #endif
2147 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2148 kfree(gspca_dev->usb_buf);
2149 kfree(gspca_dev);
2150 return ret;
2151 }
2152 EXPORT_SYMBOL(gspca_dev_probe2);
2153
2154 /* same function as the previous one, but check the interface */
2155 int gspca_dev_probe(struct usb_interface *intf,
2156 const struct usb_device_id *id,
2157 const struct sd_desc *sd_desc,
2158 int dev_size,
2159 struct module *module)
2160 {
2161 struct usb_device *dev = interface_to_usbdev(intf);
2162
2163 /* we don't handle multi-config cameras */
2164 if (dev->descriptor.bNumConfigurations != 1) {
2165 pr_err("%04x:%04x too many config\n",
2166 id->idVendor, id->idProduct);
2167 return -ENODEV;
2168 }
2169
2170 /* the USB video interface must be the first one */
2171 if (dev->actconfig->desc.bNumInterfaces != 1
2172 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2173 return -ENODEV;
2174
2175 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2176 }
2177 EXPORT_SYMBOL(gspca_dev_probe);
2178
2179 /*
2180 * USB disconnection
2181 *
2182 * This function must be called by the sub-driver
2183 * when the device disconnects, after the specific resources are freed.
2184 */
2185 void gspca_disconnect(struct usb_interface *intf)
2186 {
2187 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2188 #if IS_ENABLED(CONFIG_INPUT)
2189 struct input_dev *input_dev;
2190 #endif
2191
2192 PDEBUG(D_PROBE, "%s disconnect",
2193 video_device_node_name(&gspca_dev->vdev));
2194
2195 mutex_lock(&gspca_dev->usb_lock);
2196
2197 gspca_dev->present = 0;
2198 destroy_urbs(gspca_dev);
2199
2200 #if IS_ENABLED(CONFIG_INPUT)
2201 gspca_input_destroy_urb(gspca_dev);
2202 input_dev = gspca_dev->input_dev;
2203 if (input_dev) {
2204 gspca_dev->input_dev = NULL;
2205 input_unregister_device(input_dev);
2206 }
2207 #endif
2208 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2209 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2210 gspca_dev->sd_desc->stop0(gspca_dev);
2211 gspca_dev->streaming = 0;
2212 gspca_dev->dev = NULL;
2213 wake_up_interruptible(&gspca_dev->wq);
2214
2215 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2216 video_unregister_device(&gspca_dev->vdev);
2217
2218 mutex_unlock(&gspca_dev->usb_lock);
2219
2220 /* (this will call gspca_release() immediately or on last close) */
2221 v4l2_device_put(&gspca_dev->v4l2_dev);
2222 }
2223 EXPORT_SYMBOL(gspca_disconnect);
2224
2225 #ifdef CONFIG_PM
2226 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2227 {
2228 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2229
2230 gspca_input_destroy_urb(gspca_dev);
2231
2232 if (!gspca_dev->streaming)
2233 return 0;
2234
2235 mutex_lock(&gspca_dev->usb_lock);
2236 gspca_dev->frozen = 1; /* avoid urb error messages */
2237 gspca_dev->usb_err = 0;
2238 if (gspca_dev->sd_desc->stopN)
2239 gspca_dev->sd_desc->stopN(gspca_dev);
2240 destroy_urbs(gspca_dev);
2241 gspca_set_alt0(gspca_dev);
2242 if (gspca_dev->sd_desc->stop0)
2243 gspca_dev->sd_desc->stop0(gspca_dev);
2244 mutex_unlock(&gspca_dev->usb_lock);
2245
2246 return 0;
2247 }
2248 EXPORT_SYMBOL(gspca_suspend);
2249
2250 int gspca_resume(struct usb_interface *intf)
2251 {
2252 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2253 int streaming, ret = 0;
2254
2255 mutex_lock(&gspca_dev->usb_lock);
2256 gspca_dev->frozen = 0;
2257 gspca_dev->usb_err = 0;
2258 gspca_dev->sd_desc->init(gspca_dev);
2259 /*
2260 * Most subdrivers send all ctrl values on sd_start and thus
2261 * only write to the device registers on s_ctrl when streaming ->
2262 * Clear streaming to avoid setting all ctrls twice.
2263 */
2264 streaming = gspca_dev->streaming;
2265 gspca_dev->streaming = 0;
2266 if (streaming)
2267 ret = gspca_init_transfer(gspca_dev);
2268 else
2269 gspca_input_create_urb(gspca_dev);
2270 mutex_unlock(&gspca_dev->usb_lock);
2271
2272 return ret;
2273 }
2274 EXPORT_SYMBOL(gspca_resume);
2275 #endif
2276
2277 /* -- module insert / remove -- */
2278 static int __init gspca_init(void)
2279 {
2280 pr_info("v" GSPCA_VERSION " registered\n");
2281 return 0;
2282 }
2283 static void __exit gspca_exit(void)
2284 {
2285 }
2286
2287 module_init(gspca_init);
2288 module_exit(gspca_exit);
2289
2290 module_param_named(debug, gspca_debug, int, 0644);
2291 MODULE_PARM_DESC(debug,
2292 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
Linux kernel - Deliverables
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