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[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 pr_err("usb_alloc_urb failed\n");
800 return -ENOMEM;
801 }
802 gspca_dev->urb[n] = urb;
803 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
804 bsize,
805 GFP_KERNEL,
806 &urb->transfer_dma);
807
808 if (urb->transfer_buffer == NULL) {
809 pr_err("usb_alloc_coherent failed\n");
810 return -ENOMEM;
811 }
812 urb->dev = gspca_dev->dev;
813 urb->context = gspca_dev;
814 urb->transfer_buffer_length = bsize;
815 if (npkt != 0) { /* ISOC */
816 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
817 ep->desc.bEndpointAddress);
818 urb->transfer_flags = URB_ISO_ASAP
819 | URB_NO_TRANSFER_DMA_MAP;
820 urb->interval = 1 << (ep->desc.bInterval - 1);
821 urb->complete = isoc_irq;
822 urb->number_of_packets = npkt;
823 for (i = 0; i < npkt; i++) {
824 urb->iso_frame_desc[i].length = psize;
825 urb->iso_frame_desc[i].offset = psize * i;
826 }
827 } else { /* bulk */
828 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
829 ep->desc.bEndpointAddress);
830 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
831 urb->complete = bulk_irq;
832 }
833 }
834 return 0;
835 }
836
837 /*
838 * start the USB transfer
839 */
840 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
841 {
842 struct usb_interface *intf;
843 struct usb_host_endpoint *ep;
844 struct urb *urb;
845 struct ep_tb_s ep_tb[MAX_ALT];
846 int n, ret, xfer, alt, alt_idx;
847
848 /* reset the streaming variables */
849 gspca_dev->image = NULL;
850 gspca_dev->image_len = 0;
851 gspca_dev->last_packet_type = DISCARD_PACKET;
852 gspca_dev->sequence = 0;
853
854 gspca_dev->usb_err = 0;
855
856 /* do the specific subdriver stuff before endpoint selection */
857 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
858 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
859 if (gspca_dev->sd_desc->isoc_init) {
860 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
861 if (ret < 0)
862 return ret;
863 }
864 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
865 : USB_ENDPOINT_XFER_ISOC;
866
867 /* if bulk or the subdriver forced an altsetting, get the endpoint */
868 if (gspca_dev->alt != 0) {
869 gspca_dev->alt--; /* (previous version compatibility) */
870 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
871 gspca_dev->xfer_ep);
872 if (ep == NULL) {
873 pr_err("bad altsetting %d\n", gspca_dev->alt);
874 return -EIO;
875 }
876 ep_tb[0].alt = gspca_dev->alt;
877 alt_idx = 1;
878 } else {
879 /* else, compute the minimum bandwidth
880 * and build the endpoint table */
881 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
882 if (alt_idx <= 0) {
883 pr_err("no transfer endpoint found\n");
884 return -EIO;
885 }
886 }
887
888 /* set the highest alternate setting and
889 * loop until urb submit succeeds */
890 gspca_input_destroy_urb(gspca_dev);
891
892 gspca_dev->alt = ep_tb[--alt_idx].alt;
893 alt = -1;
894 for (;;) {
895 if (alt != gspca_dev->alt) {
896 alt = gspca_dev->alt;
897 if (intf->num_altsetting > 1) {
898 ret = usb_set_interface(gspca_dev->dev,
899 gspca_dev->iface,
900 alt);
901 if (ret < 0) {
902 if (ret == -ENOSPC)
903 goto retry; /*fixme: ugly*/
904 pr_err("set alt %d err %d\n", alt, ret);
905 goto out;
906 }
907 }
908 }
909 if (!gspca_dev->cam.no_urb_create) {
910 PDEBUG(D_STREAM, "init transfer alt %d", alt);
911 ret = create_urbs(gspca_dev,
912 alt_xfer(&intf->altsetting[alt], xfer,
913 gspca_dev->xfer_ep));
914 if (ret < 0) {
915 destroy_urbs(gspca_dev);
916 goto out;
917 }
918 }
919
920 /* clear the bulk endpoint */
921 if (gspca_dev->cam.bulk)
922 usb_clear_halt(gspca_dev->dev,
923 gspca_dev->urb[0]->pipe);
924
925 /* start the cam */
926 ret = gspca_dev->sd_desc->start(gspca_dev);
927 if (ret < 0) {
928 destroy_urbs(gspca_dev);
929 goto out;
930 }
931 gspca_dev->streaming = 1;
932 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
933
934 /* some bulk transfers are started by the subdriver */
935 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
936 break;
937
938 /* submit the URBs */
939 for (n = 0; n < MAX_NURBS; n++) {
940 urb = gspca_dev->urb[n];
941 if (urb == NULL)
942 break;
943 ret = usb_submit_urb(urb, GFP_KERNEL);
944 if (ret < 0)
945 break;
946 }
947 if (ret >= 0)
948 break; /* transfer is started */
949
950 /* something when wrong
951 * stop the webcam and free the transfer resources */
952 gspca_stream_off(gspca_dev);
953 if (ret != -ENOSPC) {
954 pr_err("usb_submit_urb alt %d err %d\n",
955 gspca_dev->alt, ret);
956 goto out;
957 }
958
959 /* the bandwidth is not wide enough
960 * negotiate or try a lower alternate setting */
961 retry:
962 PERR("alt %d - bandwidth not wide enough, trying again", alt);
963 msleep(20); /* wait for kill complete */
964 if (gspca_dev->sd_desc->isoc_nego) {
965 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
966 if (ret < 0)
967 goto out;
968 } else {
969 if (alt_idx <= 0) {
970 pr_err("no transfer endpoint found\n");
971 ret = -EIO;
972 goto out;
973 }
974 gspca_dev->alt = ep_tb[--alt_idx].alt;
975 }
976 }
977 out:
978 gspca_input_create_urb(gspca_dev);
979 return ret;
980 }
981
982 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
983 {
984 int i;
985
986 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
987 gspca_dev->curr_mode = i;
988 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
989
990 /* does nothing if ctrl_handler == NULL */
991 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
992 }
993
994 static int wxh_to_mode(struct gspca_dev *gspca_dev,
995 int width, int height)
996 {
997 int i;
998
999 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1000 if (width == gspca_dev->cam.cam_mode[i].width
1001 && height == gspca_dev->cam.cam_mode[i].height)
1002 return i;
1003 }
1004 return -EINVAL;
1005 }
1006
1007 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
1008 int width, int height)
1009 {
1010 int i;
1011
1012 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1013 if (width >= gspca_dev->cam.cam_mode[i].width
1014 && height >= gspca_dev->cam.cam_mode[i].height)
1015 break;
1016 }
1017 return i;
1018 }
1019
1020 /*
1021 * search a mode with the right pixel format
1022 */
1023 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1024 int mode,
1025 int pixfmt)
1026 {
1027 int modeU, modeD;
1028
1029 modeU = modeD = mode;
1030 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1031 if (--modeD >= 0) {
1032 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1033 == pixfmt)
1034 return modeD;
1035 }
1036 if (++modeU < gspca_dev->cam.nmodes) {
1037 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1038 == pixfmt)
1039 return modeU;
1040 }
1041 }
1042 return -EINVAL;
1043 }
1044
1045 #ifdef CONFIG_VIDEO_ADV_DEBUG
1046 static int vidioc_g_chip_info(struct file *file, void *priv,
1047 struct v4l2_dbg_chip_info *chip)
1048 {
1049 struct gspca_dev *gspca_dev = video_drvdata(file);
1050
1051 gspca_dev->usb_err = 0;
1052 if (gspca_dev->sd_desc->get_chip_info)
1053 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1054 return chip->match.addr ? -EINVAL : 0;
1055 }
1056
1057 static int vidioc_g_register(struct file *file, void *priv,
1058 struct v4l2_dbg_register *reg)
1059 {
1060 struct gspca_dev *gspca_dev = video_drvdata(file);
1061
1062 gspca_dev->usb_err = 0;
1063 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1064 }
1065
1066 static int vidioc_s_register(struct file *file, void *priv,
1067 const struct v4l2_dbg_register *reg)
1068 {
1069 struct gspca_dev *gspca_dev = video_drvdata(file);
1070
1071 gspca_dev->usb_err = 0;
1072 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1073 }
1074 #endif
1075
1076 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1077 struct v4l2_fmtdesc *fmtdesc)
1078 {
1079 struct gspca_dev *gspca_dev = video_drvdata(file);
1080 int i, j, index;
1081 __u32 fmt_tb[8];
1082
1083 /* give an index to each format */
1084 index = 0;
1085 j = 0;
1086 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1087 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1088 j = 0;
1089 for (;;) {
1090 if (fmt_tb[j] == fmt_tb[index])
1091 break;
1092 j++;
1093 }
1094 if (j == index) {
1095 if (fmtdesc->index == index)
1096 break; /* new format */
1097 index++;
1098 if (index >= ARRAY_SIZE(fmt_tb))
1099 return -EINVAL;
1100 }
1101 }
1102 if (i < 0)
1103 return -EINVAL; /* no more format */
1104
1105 fmtdesc->pixelformat = fmt_tb[index];
1106 if (gspca_dev->cam.cam_mode[i].sizeimage <
1107 gspca_dev->cam.cam_mode[i].width *
1108 gspca_dev->cam.cam_mode[i].height)
1109 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1110 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1111 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1112 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1113 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1114 fmtdesc->description[4] = '\0';
1115 return 0;
1116 }
1117
1118 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1119 struct v4l2_format *fmt)
1120 {
1121 struct gspca_dev *gspca_dev = video_drvdata(file);
1122
1123 fmt->fmt.pix = gspca_dev->pixfmt;
1124 /* some drivers use priv internally, zero it before giving it back to
1125 the core */
1126 fmt->fmt.pix.priv = 0;
1127 return 0;
1128 }
1129
1130 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1131 struct v4l2_format *fmt)
1132 {
1133 int w, h, mode, mode2;
1134
1135 w = fmt->fmt.pix.width;
1136 h = fmt->fmt.pix.height;
1137
1138 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1139 fmt->fmt.pix.pixelformat, w, h);
1140
1141 /* search the nearest mode for width and height */
1142 mode = wxh_to_nearest_mode(gspca_dev, w, h);
1143
1144 /* OK if right palette */
1145 if (gspca_dev->cam.cam_mode[mode].pixelformat
1146 != fmt->fmt.pix.pixelformat) {
1147
1148 /* else, search the closest mode with the same pixel format */
1149 mode2 = gspca_get_mode(gspca_dev, mode,
1150 fmt->fmt.pix.pixelformat);
1151 if (mode2 >= 0)
1152 mode = mode2;
1153 }
1154 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1155 if (gspca_dev->sd_desc->try_fmt) {
1156 /* pass original resolution to subdriver try_fmt */
1157 fmt->fmt.pix.width = w;
1158 fmt->fmt.pix.height = h;
1159 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1160 }
1161 /* some drivers use priv internally, zero it before giving it back to
1162 the core */
1163 fmt->fmt.pix.priv = 0;
1164 return mode; /* used when s_fmt */
1165 }
1166
1167 static int vidioc_try_fmt_vid_cap(struct file *file,
1168 void *priv,
1169 struct v4l2_format *fmt)
1170 {
1171 struct gspca_dev *gspca_dev = video_drvdata(file);
1172 int ret;
1173
1174 ret = try_fmt_vid_cap(gspca_dev, fmt);
1175 if (ret < 0)
1176 return ret;
1177 return 0;
1178 }
1179
1180 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1181 struct v4l2_format *fmt)
1182 {
1183 struct gspca_dev *gspca_dev = video_drvdata(file);
1184 int ret;
1185
1186 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1187 return -ERESTARTSYS;
1188
1189 ret = try_fmt_vid_cap(gspca_dev, fmt);
1190 if (ret < 0)
1191 goto out;
1192
1193 if (gspca_dev->nframes != 0
1194 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1195 ret = -EINVAL;
1196 goto out;
1197 }
1198
1199 if (gspca_dev->streaming) {
1200 ret = -EBUSY;
1201 goto out;
1202 }
1203 gspca_dev->curr_mode = ret;
1204 if (gspca_dev->sd_desc->try_fmt)
1205 /* subdriver try_fmt can modify format parameters */
1206 gspca_dev->pixfmt = fmt->fmt.pix;
1207 else
1208 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1209
1210 ret = 0;
1211 out:
1212 mutex_unlock(&gspca_dev->queue_lock);
1213 return ret;
1214 }
1215
1216 static int vidioc_enum_framesizes(struct file *file, void *priv,
1217 struct v4l2_frmsizeenum *fsize)
1218 {
1219 struct gspca_dev *gspca_dev = video_drvdata(file);
1220 int i;
1221 __u32 index = 0;
1222
1223 if (gspca_dev->sd_desc->enum_framesizes)
1224 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1225
1226 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1227 if (fsize->pixel_format !=
1228 gspca_dev->cam.cam_mode[i].pixelformat)
1229 continue;
1230
1231 if (fsize->index == index) {
1232 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1233 fsize->discrete.width =
1234 gspca_dev->cam.cam_mode[i].width;
1235 fsize->discrete.height =
1236 gspca_dev->cam.cam_mode[i].height;
1237 return 0;
1238 }
1239 index++;
1240 }
1241
1242 return -EINVAL;
1243 }
1244
1245 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1246 struct v4l2_frmivalenum *fival)
1247 {
1248 struct gspca_dev *gspca_dev = video_drvdata(filp);
1249 int mode;
1250 __u32 i;
1251
1252 mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1253 if (mode < 0)
1254 return -EINVAL;
1255
1256 if (gspca_dev->cam.mode_framerates == NULL ||
1257 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1258 return -EINVAL;
1259
1260 if (fival->pixel_format !=
1261 gspca_dev->cam.cam_mode[mode].pixelformat)
1262 return -EINVAL;
1263
1264 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1265 if (fival->index == i) {
1266 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1267 fival->discrete.numerator = 1;
1268 fival->discrete.denominator =
1269 gspca_dev->cam.mode_framerates[mode].rates[i];
1270 return 0;
1271 }
1272 }
1273
1274 return -EINVAL;
1275 }
1276
1277 static void gspca_release(struct v4l2_device *v4l2_device)
1278 {
1279 struct gspca_dev *gspca_dev =
1280 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1281
1282 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1283 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1284 kfree(gspca_dev->usb_buf);
1285 kfree(gspca_dev);
1286 }
1287
1288 static int dev_open(struct file *file)
1289 {
1290 struct gspca_dev *gspca_dev = video_drvdata(file);
1291 int ret;
1292
1293 PDEBUG(D_STREAM, "[%s] open", current->comm);
1294
1295 /* protect the subdriver against rmmod */
1296 if (!try_module_get(gspca_dev->module))
1297 return -ENODEV;
1298
1299 ret = v4l2_fh_open(file);
1300 if (ret)
1301 module_put(gspca_dev->module);
1302 return ret;
1303 }
1304
1305 static int dev_close(struct file *file)
1306 {
1307 struct gspca_dev *gspca_dev = video_drvdata(file);
1308
1309 PDEBUG(D_STREAM, "[%s] close", current->comm);
1310
1311 /* Needed for gspca_stream_off, always lock before queue_lock! */
1312 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1313 return -ERESTARTSYS;
1314
1315 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1316 mutex_unlock(&gspca_dev->usb_lock);
1317 return -ERESTARTSYS;
1318 }
1319
1320 /* if the file did the capture, free the streaming resources */
1321 if (gspca_dev->capt_file == file) {
1322 if (gspca_dev->streaming)
1323 gspca_stream_off(gspca_dev);
1324 frame_free(gspca_dev);
1325 }
1326 module_put(gspca_dev->module);
1327 mutex_unlock(&gspca_dev->queue_lock);
1328 mutex_unlock(&gspca_dev->usb_lock);
1329
1330 PDEBUG(D_STREAM, "close done");
1331
1332 return v4l2_fh_release(file);
1333 }
1334
1335 static int vidioc_querycap(struct file *file, void *priv,
1336 struct v4l2_capability *cap)
1337 {
1338 struct gspca_dev *gspca_dev = video_drvdata(file);
1339
1340 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1341 sizeof cap->driver);
1342 if (gspca_dev->dev->product != NULL) {
1343 strlcpy((char *) cap->card, gspca_dev->dev->product,
1344 sizeof cap->card);
1345 } else {
1346 snprintf((char *) cap->card, sizeof cap->card,
1347 "USB Camera (%04x:%04x)",
1348 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1349 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1350 }
1351 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1352 sizeof(cap->bus_info));
1353 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1354 | V4L2_CAP_STREAMING
1355 | V4L2_CAP_READWRITE;
1356 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1357 return 0;
1358 }
1359
1360 static int vidioc_enum_input(struct file *file, void *priv,
1361 struct v4l2_input *input)
1362 {
1363 struct gspca_dev *gspca_dev = video_drvdata(file);
1364
1365 if (input->index != 0)
1366 return -EINVAL;
1367 input->type = V4L2_INPUT_TYPE_CAMERA;
1368 input->status = gspca_dev->cam.input_flags;
1369 strlcpy(input->name, gspca_dev->sd_desc->name,
1370 sizeof input->name);
1371 return 0;
1372 }
1373
1374 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1375 {
1376 *i = 0;
1377 return 0;
1378 }
1379
1380 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1381 {
1382 if (i > 0)
1383 return -EINVAL;
1384 return (0);
1385 }
1386
1387 static int vidioc_reqbufs(struct file *file, void *priv,
1388 struct v4l2_requestbuffers *rb)
1389 {
1390 struct gspca_dev *gspca_dev = video_drvdata(file);
1391 int i, ret = 0, streaming;
1392
1393 i = rb->memory; /* (avoid compilation warning) */
1394 switch (i) {
1395 case GSPCA_MEMORY_READ: /* (internal call) */
1396 case V4L2_MEMORY_MMAP:
1397 case V4L2_MEMORY_USERPTR:
1398 break;
1399 default:
1400 return -EINVAL;
1401 }
1402 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1403 return -ERESTARTSYS;
1404
1405 if (gspca_dev->memory != GSPCA_MEMORY_NO
1406 && gspca_dev->memory != GSPCA_MEMORY_READ
1407 && gspca_dev->memory != rb->memory) {
1408 ret = -EBUSY;
1409 goto out;
1410 }
1411
1412 /* only one file may do the capture */
1413 if (gspca_dev->capt_file != NULL
1414 && gspca_dev->capt_file != file) {
1415 ret = -EBUSY;
1416 goto out;
1417 }
1418
1419 /* if allocated, the buffers must not be mapped */
1420 for (i = 0; i < gspca_dev->nframes; i++) {
1421 if (gspca_dev->frame[i].vma_use_count) {
1422 ret = -EBUSY;
1423 goto out;
1424 }
1425 }
1426
1427 /* stop streaming */
1428 streaming = gspca_dev->streaming;
1429 if (streaming) {
1430 gspca_stream_off(gspca_dev);
1431
1432 /* Don't restart the stream when switching from read
1433 * to mmap mode */
1434 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1435 streaming = 0;
1436 }
1437
1438 /* free the previous allocated buffers, if any */
1439 if (gspca_dev->nframes != 0)
1440 frame_free(gspca_dev);
1441 if (rb->count == 0) /* unrequest */
1442 goto out;
1443 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1444 if (ret == 0) {
1445 rb->count = gspca_dev->nframes;
1446 if (streaming)
1447 ret = gspca_init_transfer(gspca_dev);
1448 }
1449 out:
1450 mutex_unlock(&gspca_dev->queue_lock);
1451 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1452 return ret;
1453 }
1454
1455 static int vidioc_querybuf(struct file *file, void *priv,
1456 struct v4l2_buffer *v4l2_buf)
1457 {
1458 struct gspca_dev *gspca_dev = video_drvdata(file);
1459 struct gspca_frame *frame;
1460
1461 if (v4l2_buf->index >= gspca_dev->nframes)
1462 return -EINVAL;
1463
1464 frame = &gspca_dev->frame[v4l2_buf->index];
1465 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1466 return 0;
1467 }
1468
1469 static int vidioc_streamon(struct file *file, void *priv,
1470 enum v4l2_buf_type buf_type)
1471 {
1472 struct gspca_dev *gspca_dev = video_drvdata(file);
1473 int ret;
1474
1475 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1476 return -EINVAL;
1477 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1478 return -ERESTARTSYS;
1479
1480 /* check the capture file */
1481 if (gspca_dev->capt_file != file) {
1482 ret = -EBUSY;
1483 goto out;
1484 }
1485
1486 if (gspca_dev->nframes == 0
1487 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1488 ret = -EINVAL;
1489 goto out;
1490 }
1491 if (!gspca_dev->streaming) {
1492 ret = gspca_init_transfer(gspca_dev);
1493 if (ret < 0)
1494 goto out;
1495 }
1496 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1497 gspca_dev->pixfmt.pixelformat,
1498 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1499 ret = 0;
1500 out:
1501 mutex_unlock(&gspca_dev->queue_lock);
1502 return ret;
1503 }
1504
1505 static int vidioc_streamoff(struct file *file, void *priv,
1506 enum v4l2_buf_type buf_type)
1507 {
1508 struct gspca_dev *gspca_dev = video_drvdata(file);
1509 int i, ret;
1510
1511 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1512 return -EINVAL;
1513
1514 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1515 return -ERESTARTSYS;
1516
1517 if (!gspca_dev->streaming) {
1518 ret = 0;
1519 goto out;
1520 }
1521
1522 /* check the capture file */
1523 if (gspca_dev->capt_file != file) {
1524 ret = -EBUSY;
1525 goto out;
1526 }
1527
1528 /* stop streaming */
1529 gspca_stream_off(gspca_dev);
1530 /* In case another thread is waiting in dqbuf */
1531 wake_up_interruptible(&gspca_dev->wq);
1532
1533 /* empty the transfer queues */
1534 for (i = 0; i < gspca_dev->nframes; i++)
1535 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1536 atomic_set(&gspca_dev->fr_q, 0);
1537 atomic_set(&gspca_dev->fr_i, 0);
1538 gspca_dev->fr_o = 0;
1539 ret = 0;
1540 out:
1541 mutex_unlock(&gspca_dev->queue_lock);
1542 return ret;
1543 }
1544
1545 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1546 struct v4l2_jpegcompression *jpegcomp)
1547 {
1548 struct gspca_dev *gspca_dev = video_drvdata(file);
1549
1550 gspca_dev->usb_err = 0;
1551 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1552 }
1553
1554 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1555 const struct v4l2_jpegcompression *jpegcomp)
1556 {
1557 struct gspca_dev *gspca_dev = video_drvdata(file);
1558
1559 gspca_dev->usb_err = 0;
1560 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1561 }
1562
1563 static int vidioc_g_parm(struct file *filp, void *priv,
1564 struct v4l2_streamparm *parm)
1565 {
1566 struct gspca_dev *gspca_dev = video_drvdata(filp);
1567
1568 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1569
1570 if (gspca_dev->sd_desc->get_streamparm) {
1571 gspca_dev->usb_err = 0;
1572 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1573 return gspca_dev->usb_err;
1574 }
1575 return 0;
1576 }
1577
1578 static int vidioc_s_parm(struct file *filp, void *priv,
1579 struct v4l2_streamparm *parm)
1580 {
1581 struct gspca_dev *gspca_dev = video_drvdata(filp);
1582 unsigned int n;
1583
1584 n = parm->parm.capture.readbuffers;
1585 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1586 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1587 else
1588 gspca_dev->nbufread = n;
1589
1590 if (gspca_dev->sd_desc->set_streamparm) {
1591 gspca_dev->usb_err = 0;
1592 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1593 return gspca_dev->usb_err;
1594 }
1595
1596 return 0;
1597 }
1598
1599 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1600 {
1601 struct gspca_dev *gspca_dev = video_drvdata(file);
1602 struct gspca_frame *frame;
1603 struct page *page;
1604 unsigned long addr, start, size;
1605 int i, ret;
1606
1607 start = vma->vm_start;
1608 size = vma->vm_end - vma->vm_start;
1609 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1610
1611 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1612 return -ERESTARTSYS;
1613 if (gspca_dev->capt_file != file) {
1614 ret = -EINVAL;
1615 goto out;
1616 }
1617
1618 frame = NULL;
1619 for (i = 0; i < gspca_dev->nframes; ++i) {
1620 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1621 PDEBUG(D_STREAM, "mmap bad memory type");
1622 break;
1623 }
1624 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1625 == vma->vm_pgoff) {
1626 frame = &gspca_dev->frame[i];
1627 break;
1628 }
1629 }
1630 if (frame == NULL) {
1631 PDEBUG(D_STREAM, "mmap no frame buffer found");
1632 ret = -EINVAL;
1633 goto out;
1634 }
1635 if (size != frame->v4l2_buf.length) {
1636 PDEBUG(D_STREAM, "mmap bad size");
1637 ret = -EINVAL;
1638 goto out;
1639 }
1640
1641 /*
1642 * - VM_IO marks the area as being a mmaped region for I/O to a
1643 * device. It also prevents the region from being core dumped.
1644 */
1645 vma->vm_flags |= VM_IO;
1646
1647 addr = (unsigned long) frame->data;
1648 while (size > 0) {
1649 page = vmalloc_to_page((void *) addr);
1650 ret = vm_insert_page(vma, start, page);
1651 if (ret < 0)
1652 goto out;
1653 start += PAGE_SIZE;
1654 addr += PAGE_SIZE;
1655 size -= PAGE_SIZE;
1656 }
1657
1658 vma->vm_ops = &gspca_vm_ops;
1659 vma->vm_private_data = frame;
1660 gspca_vm_open(vma);
1661 ret = 0;
1662 out:
1663 mutex_unlock(&gspca_dev->queue_lock);
1664 return ret;
1665 }
1666
1667 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1668 enum v4l2_memory memory)
1669 {
1670 if (!gspca_dev->present)
1671 return -ENODEV;
1672 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1673 !gspca_dev->streaming)
1674 return -EINVAL;
1675
1676 /* check if a frame is ready */
1677 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1678 }
1679
1680 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1681 enum v4l2_memory memory)
1682 {
1683 int ret;
1684
1685 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1686 return -ERESTARTSYS;
1687 ret = frame_ready_nolock(gspca_dev, file, memory);
1688 mutex_unlock(&gspca_dev->queue_lock);
1689 return ret;
1690 }
1691
1692 /*
1693 * dequeue a video buffer
1694 *
1695 * If nonblock_ing is false, block until a buffer is available.
1696 */
1697 static int vidioc_dqbuf(struct file *file, void *priv,
1698 struct v4l2_buffer *v4l2_buf)
1699 {
1700 struct gspca_dev *gspca_dev = video_drvdata(file);
1701 struct gspca_frame *frame;
1702 int i, j, ret;
1703
1704 PDEBUG(D_FRAM, "dqbuf");
1705
1706 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1707 return -ERESTARTSYS;
1708
1709 for (;;) {
1710 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1711 if (ret < 0)
1712 goto out;
1713 if (ret > 0)
1714 break;
1715
1716 mutex_unlock(&gspca_dev->queue_lock);
1717
1718 if (file->f_flags & O_NONBLOCK)
1719 return -EAGAIN;
1720
1721 /* wait till a frame is ready */
1722 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1723 frame_ready(gspca_dev, file, v4l2_buf->memory),
1724 msecs_to_jiffies(3000));
1725 if (ret < 0)
1726 return ret;
1727 if (ret == 0)
1728 return -EIO;
1729
1730 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1731 return -ERESTARTSYS;
1732 }
1733
1734 i = gspca_dev->fr_o;
1735 j = gspca_dev->fr_queue[i];
1736 frame = &gspca_dev->frame[j];
1737
1738 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1739
1740 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1741 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1742 PDEBUG(D_FRAM, "dqbuf %d", j);
1743 ret = 0;
1744
1745 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1746 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1747 frame->data,
1748 frame->v4l2_buf.bytesused)) {
1749 PERR("dqbuf cp to user failed");
1750 ret = -EFAULT;
1751 }
1752 }
1753 out:
1754 mutex_unlock(&gspca_dev->queue_lock);
1755
1756 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1757 mutex_lock(&gspca_dev->usb_lock);
1758 gspca_dev->usb_err = 0;
1759 if (gspca_dev->present)
1760 gspca_dev->sd_desc->dq_callback(gspca_dev);
1761 mutex_unlock(&gspca_dev->usb_lock);
1762 }
1763
1764 return ret;
1765 }
1766
1767 /*
1768 * queue a video buffer
1769 *
1770 * Attempting to queue a buffer that has already been
1771 * queued will return -EINVAL.
1772 */
1773 static int vidioc_qbuf(struct file *file, void *priv,
1774 struct v4l2_buffer *v4l2_buf)
1775 {
1776 struct gspca_dev *gspca_dev = video_drvdata(file);
1777 struct gspca_frame *frame;
1778 int i, index, ret;
1779
1780 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1781
1782 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1783 return -ERESTARTSYS;
1784
1785 index = v4l2_buf->index;
1786 if ((unsigned) index >= gspca_dev->nframes) {
1787 PDEBUG(D_FRAM,
1788 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1789 ret = -EINVAL;
1790 goto out;
1791 }
1792 if (v4l2_buf->memory != gspca_dev->memory) {
1793 PDEBUG(D_FRAM, "qbuf bad memory type");
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 frame = &gspca_dev->frame[index];
1799 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1800 PDEBUG(D_FRAM, "qbuf bad state");
1801 ret = -EINVAL;
1802 goto out;
1803 }
1804
1805 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1806
1807 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1808 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1809 frame->v4l2_buf.length = v4l2_buf->length;
1810 }
1811
1812 /* put the buffer in the 'queued' queue */
1813 i = atomic_read(&gspca_dev->fr_q);
1814 gspca_dev->fr_queue[i] = index;
1815 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1816
1817 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1818 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1819 ret = 0;
1820 out:
1821 mutex_unlock(&gspca_dev->queue_lock);
1822 return ret;
1823 }
1824
1825 /*
1826 * allocate the resources for read()
1827 */
1828 static int read_alloc(struct gspca_dev *gspca_dev,
1829 struct file *file)
1830 {
1831 struct v4l2_buffer v4l2_buf;
1832 int i, ret;
1833
1834 PDEBUG(D_STREAM, "read alloc");
1835
1836 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1837 return -ERESTARTSYS;
1838
1839 if (gspca_dev->nframes == 0) {
1840 struct v4l2_requestbuffers rb;
1841
1842 memset(&rb, 0, sizeof rb);
1843 rb.count = gspca_dev->nbufread;
1844 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1845 rb.memory = GSPCA_MEMORY_READ;
1846 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1847 if (ret != 0) {
1848 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1849 goto out;
1850 }
1851 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1852 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1853 v4l2_buf.memory = GSPCA_MEMORY_READ;
1854 for (i = 0; i < gspca_dev->nbufread; i++) {
1855 v4l2_buf.index = i;
1856 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1857 if (ret != 0) {
1858 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1859 goto out;
1860 }
1861 }
1862 }
1863
1864 /* start streaming */
1865 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1866 if (ret != 0)
1867 PDEBUG(D_STREAM, "read streamon err %d", ret);
1868 out:
1869 mutex_unlock(&gspca_dev->usb_lock);
1870 return ret;
1871 }
1872
1873 static unsigned int dev_poll(struct file *file, poll_table *wait)
1874 {
1875 struct gspca_dev *gspca_dev = video_drvdata(file);
1876 unsigned long req_events = poll_requested_events(wait);
1877 int ret = 0;
1878
1879 PDEBUG(D_FRAM, "poll");
1880
1881 if (req_events & POLLPRI)
1882 ret |= v4l2_ctrl_poll(file, wait);
1883
1884 if (req_events & (POLLIN | POLLRDNORM)) {
1885 /* if reqbufs is not done, the user would use read() */
1886 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1887 if (read_alloc(gspca_dev, file) != 0) {
1888 ret |= POLLERR;
1889 goto out;
1890 }
1891 }
1892
1893 poll_wait(file, &gspca_dev->wq, wait);
1894
1895 /* check if an image has been received */
1896 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1897 ret |= POLLERR;
1898 goto out;
1899 }
1900 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1901 ret |= POLLIN | POLLRDNORM;
1902 mutex_unlock(&gspca_dev->queue_lock);
1903 }
1904
1905 out:
1906 if (!gspca_dev->present)
1907 ret |= POLLHUP;
1908
1909 return ret;
1910 }
1911
1912 static ssize_t dev_read(struct file *file, char __user *data,
1913 size_t count, loff_t *ppos)
1914 {
1915 struct gspca_dev *gspca_dev = video_drvdata(file);
1916 struct gspca_frame *frame;
1917 struct v4l2_buffer v4l2_buf;
1918 struct timeval timestamp;
1919 int n, ret, ret2;
1920
1921 PDEBUG(D_FRAM, "read (%zd)", count);
1922 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1923 ret = read_alloc(gspca_dev, file);
1924 if (ret != 0)
1925 return ret;
1926 }
1927
1928 /* get a frame */
1929 v4l2_get_timestamp(&timestamp);
1930 timestamp.tv_sec--;
1931 n = 2;
1932 for (;;) {
1933 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1934 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1935 v4l2_buf.memory = GSPCA_MEMORY_READ;
1936 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1937 if (ret != 0) {
1938 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1939 return ret;
1940 }
1941
1942 /* if the process slept for more than 1 second,
1943 * get a newer frame */
1944 frame = &gspca_dev->frame[v4l2_buf.index];
1945 if (--n < 0)
1946 break; /* avoid infinite loop */
1947 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1948 break;
1949 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1950 if (ret != 0) {
1951 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1952 return ret;
1953 }
1954 }
1955
1956 /* copy the frame */
1957 if (count > frame->v4l2_buf.bytesused)
1958 count = frame->v4l2_buf.bytesused;
1959 ret = copy_to_user(data, frame->data, count);
1960 if (ret != 0) {
1961 PERR("read cp to user lack %d / %zd", ret, count);
1962 ret = -EFAULT;
1963 goto out;
1964 }
1965 ret = count;
1966 out:
1967 /* in each case, requeue the buffer */
1968 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1969 if (ret2 != 0)
1970 return ret2;
1971 return ret;
1972 }
1973
1974 static struct v4l2_file_operations dev_fops = {
1975 .owner = THIS_MODULE,
1976 .open = dev_open,
1977 .release = dev_close,
1978 .read = dev_read,
1979 .mmap = dev_mmap,
1980 .unlocked_ioctl = video_ioctl2,
1981 .poll = dev_poll,
1982 };
1983
1984 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1985 .vidioc_querycap = vidioc_querycap,
1986 .vidioc_dqbuf = vidioc_dqbuf,
1987 .vidioc_qbuf = vidioc_qbuf,
1988 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1989 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1990 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1991 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1992 .vidioc_streamon = vidioc_streamon,
1993 .vidioc_enum_input = vidioc_enum_input,
1994 .vidioc_g_input = vidioc_g_input,
1995 .vidioc_s_input = vidioc_s_input,
1996 .vidioc_reqbufs = vidioc_reqbufs,
1997 .vidioc_querybuf = vidioc_querybuf,
1998 .vidioc_streamoff = vidioc_streamoff,
1999 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2000 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2001 .vidioc_g_parm = vidioc_g_parm,
2002 .vidioc_s_parm = vidioc_s_parm,
2003 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2004 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2005 #ifdef CONFIG_VIDEO_ADV_DEBUG
2006 .vidioc_g_chip_info = vidioc_g_chip_info,
2007 .vidioc_g_register = vidioc_g_register,
2008 .vidioc_s_register = vidioc_s_register,
2009 #endif
2010 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2011 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2012 };
2013
2014 static const struct video_device gspca_template = {
2015 .name = "gspca main driver",
2016 .fops = &dev_fops,
2017 .ioctl_ops = &dev_ioctl_ops,
2018 .release = video_device_release_empty, /* We use v4l2_dev.release */
2019 };
2020
2021 /*
2022 * probe and create a new gspca device
2023 *
2024 * This function must be called by the sub-driver when it is
2025 * called for probing a new device.
2026 */
2027 int gspca_dev_probe2(struct usb_interface *intf,
2028 const struct usb_device_id *id,
2029 const struct sd_desc *sd_desc,
2030 int dev_size,
2031 struct module *module)
2032 {
2033 struct gspca_dev *gspca_dev;
2034 struct usb_device *dev = interface_to_usbdev(intf);
2035 int ret;
2036
2037 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2038 sd_desc->name, id->idVendor, id->idProduct);
2039
2040 /* create the device */
2041 if (dev_size < sizeof *gspca_dev)
2042 dev_size = sizeof *gspca_dev;
2043 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2044 if (!gspca_dev) {
2045 pr_err("couldn't kzalloc gspca struct\n");
2046 return -ENOMEM;
2047 }
2048 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2049 if (!gspca_dev->usb_buf) {
2050 pr_err("out of memory\n");
2051 ret = -ENOMEM;
2052 goto out;
2053 }
2054 gspca_dev->dev = dev;
2055 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2056 gspca_dev->xfer_ep = -1;
2057
2058 /* check if any audio device */
2059 if (dev->actconfig->desc.bNumInterfaces != 1) {
2060 int i;
2061 struct usb_interface *intf2;
2062
2063 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2064 intf2 = dev->actconfig->interface[i];
2065 if (intf2 != NULL
2066 && intf2->altsetting != NULL
2067 && intf2->altsetting->desc.bInterfaceClass ==
2068 USB_CLASS_AUDIO) {
2069 gspca_dev->audio = 1;
2070 break;
2071 }
2072 }
2073 }
2074
2075 gspca_dev->v4l2_dev.release = gspca_release;
2076 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2077 if (ret)
2078 goto out;
2079 gspca_dev->sd_desc = sd_desc;
2080 gspca_dev->nbufread = 2;
2081 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2082 gspca_dev->vdev = gspca_template;
2083 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2084 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2085 gspca_dev->module = module;
2086 gspca_dev->present = 1;
2087
2088 mutex_init(&gspca_dev->usb_lock);
2089 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2090 mutex_init(&gspca_dev->queue_lock);
2091 init_waitqueue_head(&gspca_dev->wq);
2092
2093 /* configure the subdriver and initialize the USB device */
2094 ret = sd_desc->config(gspca_dev, id);
2095 if (ret < 0)
2096 goto out;
2097 ret = sd_desc->init(gspca_dev);
2098 if (ret < 0)
2099 goto out;
2100 if (sd_desc->init_controls)
2101 ret = sd_desc->init_controls(gspca_dev);
2102 if (ret < 0)
2103 goto out;
2104 gspca_set_default_mode(gspca_dev);
2105
2106 ret = gspca_input_connect(gspca_dev);
2107 if (ret)
2108 goto out;
2109
2110 /*
2111 * Don't take usb_lock for these ioctls. This improves latency if
2112 * usb_lock is taken for a long time, e.g. when changing a control
2113 * value, and a new frame is ready to be dequeued.
2114 */
2115 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2116 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2117 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2118 #ifdef CONFIG_VIDEO_ADV_DEBUG
2119 if (!gspca_dev->sd_desc->get_register)
2120 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2121 if (!gspca_dev->sd_desc->set_register)
2122 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2123 #endif
2124 if (!gspca_dev->sd_desc->get_jcomp)
2125 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2126 if (!gspca_dev->sd_desc->set_jcomp)
2127 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2128
2129 /* init video stuff */
2130 ret = video_register_device(&gspca_dev->vdev,
2131 VFL_TYPE_GRABBER,
2132 -1);
2133 if (ret < 0) {
2134 pr_err("video_register_device err %d\n", ret);
2135 goto out;
2136 }
2137
2138 usb_set_intfdata(intf, gspca_dev);
2139 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2140
2141 gspca_input_create_urb(gspca_dev);
2142
2143 return 0;
2144 out:
2145 #if IS_ENABLED(CONFIG_INPUT)
2146 if (gspca_dev->input_dev)
2147 input_unregister_device(gspca_dev->input_dev);
2148 #endif
2149 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2150 kfree(gspca_dev->usb_buf);
2151 kfree(gspca_dev);
2152 return ret;
2153 }
2154 EXPORT_SYMBOL(gspca_dev_probe2);
2155
2156 /* same function as the previous one, but check the interface */
2157 int gspca_dev_probe(struct usb_interface *intf,
2158 const struct usb_device_id *id,
2159 const struct sd_desc *sd_desc,
2160 int dev_size,
2161 struct module *module)
2162 {
2163 struct usb_device *dev = interface_to_usbdev(intf);
2164
2165 /* we don't handle multi-config cameras */
2166 if (dev->descriptor.bNumConfigurations != 1) {
2167 pr_err("%04x:%04x too many config\n",
2168 id->idVendor, id->idProduct);
2169 return -ENODEV;
2170 }
2171
2172 /* the USB video interface must be the first one */
2173 if (dev->actconfig->desc.bNumInterfaces != 1
2174 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2175 return -ENODEV;
2176
2177 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2178 }
2179 EXPORT_SYMBOL(gspca_dev_probe);
2180
2181 /*
2182 * USB disconnection
2183 *
2184 * This function must be called by the sub-driver
2185 * when the device disconnects, after the specific resources are freed.
2186 */
2187 void gspca_disconnect(struct usb_interface *intf)
2188 {
2189 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2190 #if IS_ENABLED(CONFIG_INPUT)
2191 struct input_dev *input_dev;
2192 #endif
2193
2194 PDEBUG(D_PROBE, "%s disconnect",
2195 video_device_node_name(&gspca_dev->vdev));
2196
2197 mutex_lock(&gspca_dev->usb_lock);
2198
2199 gspca_dev->present = 0;
2200 destroy_urbs(gspca_dev);
2201
2202 #if IS_ENABLED(CONFIG_INPUT)
2203 gspca_input_destroy_urb(gspca_dev);
2204 input_dev = gspca_dev->input_dev;
2205 if (input_dev) {
2206 gspca_dev->input_dev = NULL;
2207 input_unregister_device(input_dev);
2208 }
2209 #endif
2210 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2211 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2212 gspca_dev->sd_desc->stop0(gspca_dev);
2213 gspca_dev->streaming = 0;
2214 gspca_dev->dev = NULL;
2215 wake_up_interruptible(&gspca_dev->wq);
2216
2217 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2218 video_unregister_device(&gspca_dev->vdev);
2219
2220 mutex_unlock(&gspca_dev->usb_lock);
2221
2222 /* (this will call gspca_release() immediately or on last close) */
2223 v4l2_device_put(&gspca_dev->v4l2_dev);
2224 }
2225 EXPORT_SYMBOL(gspca_disconnect);
2226
2227 #ifdef CONFIG_PM
2228 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2229 {
2230 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2231
2232 gspca_input_destroy_urb(gspca_dev);
2233
2234 if (!gspca_dev->streaming)
2235 return 0;
2236
2237 mutex_lock(&gspca_dev->usb_lock);
2238 gspca_dev->frozen = 1; /* avoid urb error messages */
2239 gspca_dev->usb_err = 0;
2240 if (gspca_dev->sd_desc->stopN)
2241 gspca_dev->sd_desc->stopN(gspca_dev);
2242 destroy_urbs(gspca_dev);
2243 gspca_set_alt0(gspca_dev);
2244 if (gspca_dev->sd_desc->stop0)
2245 gspca_dev->sd_desc->stop0(gspca_dev);
2246 mutex_unlock(&gspca_dev->usb_lock);
2247
2248 return 0;
2249 }
2250 EXPORT_SYMBOL(gspca_suspend);
2251
2252 int gspca_resume(struct usb_interface *intf)
2253 {
2254 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2255 int streaming, ret = 0;
2256
2257 mutex_lock(&gspca_dev->usb_lock);
2258 gspca_dev->frozen = 0;
2259 gspca_dev->usb_err = 0;
2260 gspca_dev->sd_desc->init(gspca_dev);
2261 /*
2262 * Most subdrivers send all ctrl values on sd_start and thus
2263 * only write to the device registers on s_ctrl when streaming ->
2264 * Clear streaming to avoid setting all ctrls twice.
2265 */
2266 streaming = gspca_dev->streaming;
2267 gspca_dev->streaming = 0;
2268 if (streaming)
2269 ret = gspca_init_transfer(gspca_dev);
2270 else
2271 gspca_input_create_urb(gspca_dev);
2272 mutex_unlock(&gspca_dev->usb_lock);
2273
2274 return ret;
2275 }
2276 EXPORT_SYMBOL(gspca_resume);
2277 #endif
2278
2279 /* -- module insert / remove -- */
2280 static int __init gspca_init(void)
2281 {
2282 pr_info("v" GSPCA_VERSION " registered\n");
2283 return 0;
2284 }
2285 static void __exit gspca_exit(void)
2286 {
2287 }
2288
2289 module_init(gspca_init);
2290 module_exit(gspca_exit);
2291
2292 module_param_named(debug, gspca_debug, int, 0644);
2293 MODULE_PARM_DESC(debug,
2294 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
Linux kernel - Deliverables
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