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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[mirror_ubuntu-artful-kernel.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, buffer_len=%u, interval=%u",
205 ep->bEndpointAddress, buffer_len, interval);
206
207 dev = gspca_dev->dev;
208
209 urb = usb_alloc_urb(0, GFP_KERNEL);
210 if (!urb) {
211 ret = -ENOMEM;
212 goto error;
213 }
214
215 buffer = usb_alloc_coherent(dev, buffer_len,
216 GFP_KERNEL, &urb->transfer_dma);
217 if (!buffer) {
218 ret = -ENOMEM;
219 goto error_buffer;
220 }
221 usb_fill_int_urb(urb, dev,
222 usb_rcvintpipe(dev, ep->bEndpointAddress),
223 buffer, buffer_len,
224 int_irq, (void *)gspca_dev, interval);
225 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
226 ret = usb_submit_urb(urb, GFP_KERNEL);
227 if (ret < 0) {
228 PERR("submit int URB failed with error %i", ret);
229 goto error_submit;
230 }
231 gspca_dev->int_urb = urb;
232 return ret;
233
234 error_submit:
235 usb_free_coherent(dev,
236 urb->transfer_buffer_length,
237 urb->transfer_buffer,
238 urb->transfer_dma);
239 error_buffer:
240 usb_free_urb(urb);
241 error:
242 return ret;
243 }
244
245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
246 {
247 struct usb_interface *intf;
248 struct usb_host_interface *intf_desc;
249 struct usb_endpoint_descriptor *ep;
250 int i;
251
252 if (gspca_dev->sd_desc->int_pkt_scan) {
253 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
254 intf_desc = intf->cur_altsetting;
255 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
256 ep = &intf_desc->endpoint[i].desc;
257 if (usb_endpoint_dir_in(ep) &&
258 usb_endpoint_xfer_int(ep)) {
259
260 alloc_and_submit_int_urb(gspca_dev, ep);
261 break;
262 }
263 }
264 }
265 }
266
267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
268 {
269 struct urb *urb;
270
271 urb = gspca_dev->int_urb;
272 if (urb) {
273 gspca_dev->int_urb = NULL;
274 usb_kill_urb(urb);
275 usb_free_coherent(gspca_dev->dev,
276 urb->transfer_buffer_length,
277 urb->transfer_buffer,
278 urb->transfer_dma);
279 usb_free_urb(urb);
280 }
281 }
282 #else
283 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
284 {
285 }
286
287 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
288 {
289 }
290
291 static inline int gspca_input_connect(struct gspca_dev *dev)
292 {
293 return 0;
294 }
295 #endif
296
297 /*
298 * fill a video frame from an URB and resubmit
299 */
300 static void fill_frame(struct gspca_dev *gspca_dev,
301 struct urb *urb)
302 {
303 u8 *data; /* address of data in the iso message */
304 int i, len, st;
305 cam_pkt_op pkt_scan;
306
307 if (urb->status != 0) {
308 if (urb->status == -ESHUTDOWN)
309 return; /* disconnection */
310 #ifdef CONFIG_PM
311 if (gspca_dev->frozen)
312 return;
313 #endif
314 PERR("urb status: %d", urb->status);
315 urb->status = 0;
316 goto resubmit;
317 }
318 pkt_scan = gspca_dev->sd_desc->pkt_scan;
319 for (i = 0; i < urb->number_of_packets; i++) {
320 len = urb->iso_frame_desc[i].actual_length;
321
322 /* check the packet status and length */
323 st = urb->iso_frame_desc[i].status;
324 if (st) {
325 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
326 i, len, st);
327 gspca_dev->last_packet_type = DISCARD_PACKET;
328 continue;
329 }
330 if (len == 0) {
331 if (gspca_dev->empty_packet == 0)
332 gspca_dev->empty_packet = 1;
333 continue;
334 }
335
336 /* let the packet be analyzed by the subdriver */
337 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
338 i, urb->iso_frame_desc[i].offset, len);
339 data = (u8 *) urb->transfer_buffer
340 + urb->iso_frame_desc[i].offset;
341 pkt_scan(gspca_dev, data, len);
342 }
343
344 resubmit:
345 /* resubmit the URB */
346 st = usb_submit_urb(urb, GFP_ATOMIC);
347 if (st < 0)
348 pr_err("usb_submit_urb() ret %d\n", st);
349 }
350
351 /*
352 * ISOC message interrupt from the USB device
353 *
354 * Analyse each packet and call the subdriver for copy to the frame buffer.
355 */
356 static void isoc_irq(struct urb *urb)
357 {
358 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
359
360 PDEBUG(D_PACK, "isoc irq");
361 if (!gspca_dev->streaming)
362 return;
363 fill_frame(gspca_dev, urb);
364 }
365
366 /*
367 * bulk message interrupt from the USB device
368 */
369 static void bulk_irq(struct urb *urb)
370 {
371 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
372 int st;
373
374 PDEBUG(D_PACK, "bulk irq");
375 if (!gspca_dev->streaming)
376 return;
377 switch (urb->status) {
378 case 0:
379 break;
380 case -ESHUTDOWN:
381 return; /* disconnection */
382 default:
383 #ifdef CONFIG_PM
384 if (gspca_dev->frozen)
385 return;
386 #endif
387 PERR("urb status: %d", urb->status);
388 urb->status = 0;
389 goto resubmit;
390 }
391
392 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
393 gspca_dev->sd_desc->pkt_scan(gspca_dev,
394 urb->transfer_buffer,
395 urb->actual_length);
396
397 resubmit:
398 /* resubmit the URB */
399 if (gspca_dev->cam.bulk_nurbs != 0) {
400 st = usb_submit_urb(urb, GFP_ATOMIC);
401 if (st < 0)
402 pr_err("usb_submit_urb() ret %d\n", st);
403 }
404 }
405
406 /*
407 * add data to the current frame
408 *
409 * This function is called by the subdrivers at interrupt level.
410 *
411 * To build a frame, these ones must add
412 * - one FIRST_PACKET
413 * - 0 or many INTER_PACKETs
414 * - one LAST_PACKET
415 * DISCARD_PACKET invalidates the whole frame.
416 */
417 void gspca_frame_add(struct gspca_dev *gspca_dev,
418 enum gspca_packet_type packet_type,
419 const u8 *data,
420 int len)
421 {
422 struct gspca_frame *frame;
423 int i, j;
424
425 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
426
427 if (packet_type == FIRST_PACKET) {
428 i = atomic_read(&gspca_dev->fr_i);
429
430 /* if there are no queued buffer, discard the whole frame */
431 if (i == atomic_read(&gspca_dev->fr_q)) {
432 gspca_dev->last_packet_type = DISCARD_PACKET;
433 gspca_dev->sequence++;
434 return;
435 }
436 j = gspca_dev->fr_queue[i];
437 frame = &gspca_dev->frame[j];
438 v4l2_get_timestamp(&frame->v4l2_buf.timestamp);
439 frame->v4l2_buf.sequence = gspca_dev->sequence++;
440 gspca_dev->image = frame->data;
441 gspca_dev->image_len = 0;
442 } else {
443 switch (gspca_dev->last_packet_type) {
444 case DISCARD_PACKET:
445 if (packet_type == LAST_PACKET) {
446 gspca_dev->last_packet_type = packet_type;
447 gspca_dev->image = NULL;
448 gspca_dev->image_len = 0;
449 }
450 return;
451 case LAST_PACKET:
452 return;
453 }
454 }
455
456 /* append the packet to the frame buffer */
457 if (len > 0) {
458 if (gspca_dev->image_len + len > gspca_dev->frsz) {
459 PERR("frame overflow %d > %d",
460 gspca_dev->image_len + len,
461 gspca_dev->frsz);
462 packet_type = DISCARD_PACKET;
463 } else {
464 /* !! image is NULL only when last pkt is LAST or DISCARD
465 if (gspca_dev->image == NULL) {
466 pr_err("gspca_frame_add() image == NULL\n");
467 return;
468 }
469 */
470 memcpy(gspca_dev->image + gspca_dev->image_len,
471 data, len);
472 gspca_dev->image_len += len;
473 }
474 }
475 gspca_dev->last_packet_type = packet_type;
476
477 /* if last packet, invalidate packet concatenation until
478 * next first packet, wake up the application and advance
479 * in the queue */
480 if (packet_type == LAST_PACKET) {
481 i = atomic_read(&gspca_dev->fr_i);
482 j = gspca_dev->fr_queue[i];
483 frame = &gspca_dev->frame[j];
484 frame->v4l2_buf.bytesused = gspca_dev->image_len;
485 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
486 | V4L2_BUF_FLAG_DONE)
487 & ~V4L2_BUF_FLAG_QUEUED;
488 i = (i + 1) % GSPCA_MAX_FRAMES;
489 atomic_set(&gspca_dev->fr_i, i);
490 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
491 PDEBUG(D_FRAM, "frame complete len:%d",
492 frame->v4l2_buf.bytesused);
493 gspca_dev->image = NULL;
494 gspca_dev->image_len = 0;
495 }
496 }
497 EXPORT_SYMBOL(gspca_frame_add);
498
499 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
500 enum v4l2_memory memory, unsigned int count)
501 {
502 struct gspca_frame *frame;
503 unsigned int frsz;
504 int i;
505
506 frsz = gspca_dev->pixfmt.sizeimage;
507 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
508 frsz = PAGE_ALIGN(frsz);
509 if (count >= GSPCA_MAX_FRAMES)
510 count = GSPCA_MAX_FRAMES - 1;
511 gspca_dev->frbuf = vmalloc_32(frsz * count);
512 if (!gspca_dev->frbuf) {
513 pr_err("frame alloc failed\n");
514 return -ENOMEM;
515 }
516 gspca_dev->capt_file = file;
517 gspca_dev->memory = memory;
518 gspca_dev->frsz = frsz;
519 gspca_dev->nframes = count;
520 for (i = 0; i < count; i++) {
521 frame = &gspca_dev->frame[i];
522 frame->v4l2_buf.index = i;
523 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
524 frame->v4l2_buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
525 frame->v4l2_buf.field = V4L2_FIELD_NONE;
526 frame->v4l2_buf.length = frsz;
527 frame->v4l2_buf.memory = memory;
528 frame->v4l2_buf.sequence = 0;
529 frame->data = gspca_dev->frbuf + i * frsz;
530 frame->v4l2_buf.m.offset = i * frsz;
531 }
532 atomic_set(&gspca_dev->fr_q, 0);
533 atomic_set(&gspca_dev->fr_i, 0);
534 gspca_dev->fr_o = 0;
535 return 0;
536 }
537
538 static void frame_free(struct gspca_dev *gspca_dev)
539 {
540 int i;
541
542 PDEBUG(D_STREAM, "frame free");
543 if (gspca_dev->frbuf != NULL) {
544 vfree(gspca_dev->frbuf);
545 gspca_dev->frbuf = NULL;
546 for (i = 0; i < gspca_dev->nframes; i++)
547 gspca_dev->frame[i].data = NULL;
548 }
549 gspca_dev->nframes = 0;
550 gspca_dev->frsz = 0;
551 gspca_dev->capt_file = NULL;
552 gspca_dev->memory = GSPCA_MEMORY_NO;
553 }
554
555 static void destroy_urbs(struct gspca_dev *gspca_dev)
556 {
557 struct urb *urb;
558 unsigned int i;
559
560 PDEBUG(D_STREAM, "kill transfer");
561 for (i = 0; i < MAX_NURBS; i++) {
562 urb = gspca_dev->urb[i];
563 if (urb == NULL)
564 break;
565
566 gspca_dev->urb[i] = NULL;
567 usb_kill_urb(urb);
568 usb_free_coherent(gspca_dev->dev,
569 urb->transfer_buffer_length,
570 urb->transfer_buffer,
571 urb->transfer_dma);
572 usb_free_urb(urb);
573 }
574 }
575
576 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
577 {
578 int ret;
579
580 if (gspca_dev->alt == 0)
581 return 0;
582 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
583 if (ret < 0)
584 pr_err("set alt 0 err %d\n", ret);
585 return ret;
586 }
587
588 /* Note: both the queue and the usb locks should be held when calling this */
589 static void gspca_stream_off(struct gspca_dev *gspca_dev)
590 {
591 gspca_dev->streaming = 0;
592 gspca_dev->usb_err = 0;
593 if (gspca_dev->sd_desc->stopN)
594 gspca_dev->sd_desc->stopN(gspca_dev);
595 destroy_urbs(gspca_dev);
596 gspca_input_destroy_urb(gspca_dev);
597 gspca_set_alt0(gspca_dev);
598 gspca_input_create_urb(gspca_dev);
599 if (gspca_dev->sd_desc->stop0)
600 gspca_dev->sd_desc->stop0(gspca_dev);
601 PDEBUG(D_STREAM, "stream off OK");
602 }
603
604 /*
605 * look for an input transfer endpoint in an alternate setting.
606 *
607 * If xfer_ep is invalid, return the first valid ep found, otherwise
608 * look for exactly the ep with address equal to xfer_ep.
609 */
610 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
611 int xfer, int xfer_ep)
612 {
613 struct usb_host_endpoint *ep;
614 int i, attr;
615
616 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
617 ep = &alt->endpoint[i];
618 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
619 if (attr == xfer
620 && ep->desc.wMaxPacketSize != 0
621 && usb_endpoint_dir_in(&ep->desc)
622 && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
623 return ep;
624 }
625 return NULL;
626 }
627
628 /* compute the minimum bandwidth for the current transfer */
629 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
630 {
631 u32 bandwidth;
632
633 /* get the (max) image size */
634 bandwidth = gspca_dev->pixfmt.sizeimage;
635
636 /* if the image is compressed, estimate its mean size */
637 if (!gspca_dev->cam.needs_full_bandwidth &&
638 bandwidth < gspca_dev->pixfmt.width *
639 gspca_dev->pixfmt.height)
640 bandwidth = bandwidth * 3 / 8; /* 0.375 */
641
642 /* estimate the frame rate */
643 if (gspca_dev->sd_desc->get_streamparm) {
644 struct v4l2_streamparm parm;
645
646 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
647 bandwidth *= parm.parm.capture.timeperframe.denominator;
648 bandwidth /= parm.parm.capture.timeperframe.numerator;
649 } else {
650
651 /* don't hope more than 15 fps with USB 1.1 and
652 * image resolution >= 640x480 */
653 if (gspca_dev->pixfmt.width >= 640
654 && gspca_dev->dev->speed == USB_SPEED_FULL)
655 bandwidth *= 15; /* 15 fps */
656 else
657 bandwidth *= 30; /* 30 fps */
658 }
659
660 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
661 return bandwidth;
662 }
663
664 /* endpoint table */
665 #define MAX_ALT 16
666 struct ep_tb_s {
667 u32 alt;
668 u32 bandwidth;
669 };
670
671 /*
672 * build the table of the endpoints
673 * and compute the minimum bandwidth for the image transfer
674 */
675 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
676 struct usb_interface *intf,
677 struct ep_tb_s *ep_tb)
678 {
679 struct usb_host_endpoint *ep;
680 int i, j, nbalt, psize, found;
681 u32 bandwidth, last_bw;
682
683 nbalt = intf->num_altsetting;
684 if (nbalt > MAX_ALT)
685 nbalt = MAX_ALT; /* fixme: should warn */
686
687 /* build the endpoint table */
688 i = 0;
689 last_bw = 0;
690 for (;;) {
691 ep_tb->bandwidth = 2000 * 2000 * 120;
692 found = 0;
693 for (j = 0; j < nbalt; j++) {
694 ep = alt_xfer(&intf->altsetting[j],
695 USB_ENDPOINT_XFER_ISOC,
696 gspca_dev->xfer_ep);
697 if (ep == NULL)
698 continue;
699 if (ep->desc.bInterval == 0) {
700 pr_err("alt %d iso endp with 0 interval\n", j);
701 continue;
702 }
703 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
704 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
705 bandwidth = psize * 1000;
706 if (gspca_dev->dev->speed == USB_SPEED_HIGH
707 || gspca_dev->dev->speed >= USB_SPEED_SUPER)
708 bandwidth *= 8;
709 bandwidth /= 1 << (ep->desc.bInterval - 1);
710 if (bandwidth <= last_bw)
711 continue;
712 if (bandwidth < ep_tb->bandwidth) {
713 ep_tb->bandwidth = bandwidth;
714 ep_tb->alt = j;
715 found = 1;
716 }
717 }
718 if (!found)
719 break;
720 PDEBUG(D_STREAM, "alt %d bandwidth %d",
721 ep_tb->alt, ep_tb->bandwidth);
722 last_bw = ep_tb->bandwidth;
723 i++;
724 ep_tb++;
725 }
726
727 /*
728 * If the camera:
729 * has a usb audio class interface (a built in usb mic); and
730 * is a usb 1 full speed device; and
731 * uses the max full speed iso bandwidth; and
732 * and has more than 1 alt setting
733 * then skip the highest alt setting to spare bandwidth for the mic
734 */
735 if (gspca_dev->audio &&
736 gspca_dev->dev->speed == USB_SPEED_FULL &&
737 last_bw >= 1000000 &&
738 i > 1) {
739 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
740 i--;
741 ep_tb--;
742 }
743
744 /* get the requested bandwidth and start at the highest atlsetting */
745 bandwidth = which_bandwidth(gspca_dev);
746 ep_tb--;
747 while (i > 1) {
748 ep_tb--;
749 if (ep_tb->bandwidth < bandwidth)
750 break;
751 i--;
752 }
753 return i;
754 }
755
756 /*
757 * create the URBs for image transfer
758 */
759 static int create_urbs(struct gspca_dev *gspca_dev,
760 struct usb_host_endpoint *ep)
761 {
762 struct urb *urb;
763 int n, nurbs, i, psize, npkt, bsize;
764
765 /* calculate the packet size and the number of packets */
766 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
767
768 if (!gspca_dev->cam.bulk) { /* isoc */
769
770 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
771 if (gspca_dev->pkt_size == 0)
772 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
773 else
774 psize = gspca_dev->pkt_size;
775 npkt = gspca_dev->cam.npkt;
776 if (npkt == 0)
777 npkt = 32; /* default value */
778 bsize = psize * npkt;
779 PDEBUG(D_STREAM,
780 "isoc %d pkts size %d = bsize:%d",
781 npkt, psize, bsize);
782 nurbs = DEF_NURBS;
783 } else { /* bulk */
784 npkt = 0;
785 bsize = gspca_dev->cam.bulk_size;
786 if (bsize == 0)
787 bsize = psize;
788 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
789 if (gspca_dev->cam.bulk_nurbs != 0)
790 nurbs = gspca_dev->cam.bulk_nurbs;
791 else
792 nurbs = 1;
793 }
794
795 for (n = 0; n < nurbs; n++) {
796 urb = usb_alloc_urb(npkt, GFP_KERNEL);
797 if (!urb)
798 return -ENOMEM;
799 gspca_dev->urb[n] = urb;
800 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
801 bsize,
802 GFP_KERNEL,
803 &urb->transfer_dma);
804
805 if (urb->transfer_buffer == NULL) {
806 pr_err("usb_alloc_coherent failed\n");
807 return -ENOMEM;
808 }
809 urb->dev = gspca_dev->dev;
810 urb->context = gspca_dev;
811 urb->transfer_buffer_length = bsize;
812 if (npkt != 0) { /* ISOC */
813 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
814 ep->desc.bEndpointAddress);
815 urb->transfer_flags = URB_ISO_ASAP
816 | URB_NO_TRANSFER_DMA_MAP;
817 urb->interval = 1 << (ep->desc.bInterval - 1);
818 urb->complete = isoc_irq;
819 urb->number_of_packets = npkt;
820 for (i = 0; i < npkt; i++) {
821 urb->iso_frame_desc[i].length = psize;
822 urb->iso_frame_desc[i].offset = psize * i;
823 }
824 } else { /* bulk */
825 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
826 ep->desc.bEndpointAddress);
827 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
828 urb->complete = bulk_irq;
829 }
830 }
831 return 0;
832 }
833
834 /*
835 * start the USB transfer
836 */
837 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
838 {
839 struct usb_interface *intf;
840 struct usb_host_endpoint *ep;
841 struct urb *urb;
842 struct ep_tb_s ep_tb[MAX_ALT];
843 int n, ret, xfer, alt, alt_idx;
844
845 /* reset the streaming variables */
846 gspca_dev->image = NULL;
847 gspca_dev->image_len = 0;
848 gspca_dev->last_packet_type = DISCARD_PACKET;
849 gspca_dev->sequence = 0;
850
851 gspca_dev->usb_err = 0;
852
853 /* do the specific subdriver stuff before endpoint selection */
854 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
855 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
856 if (gspca_dev->sd_desc->isoc_init) {
857 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
858 if (ret < 0)
859 return ret;
860 }
861 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
862 : USB_ENDPOINT_XFER_ISOC;
863
864 /* if bulk or the subdriver forced an altsetting, get the endpoint */
865 if (gspca_dev->alt != 0) {
866 gspca_dev->alt--; /* (previous version compatibility) */
867 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
868 gspca_dev->xfer_ep);
869 if (ep == NULL) {
870 pr_err("bad altsetting %d\n", gspca_dev->alt);
871 return -EIO;
872 }
873 ep_tb[0].alt = gspca_dev->alt;
874 alt_idx = 1;
875 } else {
876 /* else, compute the minimum bandwidth
877 * and build the endpoint table */
878 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
879 if (alt_idx <= 0) {
880 pr_err("no transfer endpoint found\n");
881 return -EIO;
882 }
883 }
884
885 /* set the highest alternate setting and
886 * loop until urb submit succeeds */
887 gspca_input_destroy_urb(gspca_dev);
888
889 gspca_dev->alt = ep_tb[--alt_idx].alt;
890 alt = -1;
891 for (;;) {
892 if (alt != gspca_dev->alt) {
893 alt = gspca_dev->alt;
894 if (intf->num_altsetting > 1) {
895 ret = usb_set_interface(gspca_dev->dev,
896 gspca_dev->iface,
897 alt);
898 if (ret < 0) {
899 if (ret == -ENOSPC)
900 goto retry; /*fixme: ugly*/
901 pr_err("set alt %d err %d\n", alt, ret);
902 goto out;
903 }
904 }
905 }
906 if (!gspca_dev->cam.no_urb_create) {
907 PDEBUG(D_STREAM, "init transfer alt %d", alt);
908 ret = create_urbs(gspca_dev,
909 alt_xfer(&intf->altsetting[alt], xfer,
910 gspca_dev->xfer_ep));
911 if (ret < 0) {
912 destroy_urbs(gspca_dev);
913 goto out;
914 }
915 }
916
917 /* clear the bulk endpoint */
918 if (gspca_dev->cam.bulk)
919 usb_clear_halt(gspca_dev->dev,
920 gspca_dev->urb[0]->pipe);
921
922 /* start the cam */
923 ret = gspca_dev->sd_desc->start(gspca_dev);
924 if (ret < 0) {
925 destroy_urbs(gspca_dev);
926 goto out;
927 }
928 gspca_dev->streaming = 1;
929 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
930
931 /* some bulk transfers are started by the subdriver */
932 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
933 break;
934
935 /* submit the URBs */
936 for (n = 0; n < MAX_NURBS; n++) {
937 urb = gspca_dev->urb[n];
938 if (urb == NULL)
939 break;
940 ret = usb_submit_urb(urb, GFP_KERNEL);
941 if (ret < 0)
942 break;
943 }
944 if (ret >= 0)
945 break; /* transfer is started */
946
947 /* something when wrong
948 * stop the webcam and free the transfer resources */
949 gspca_stream_off(gspca_dev);
950 if (ret != -ENOSPC) {
951 pr_err("usb_submit_urb alt %d err %d\n",
952 gspca_dev->alt, ret);
953 goto out;
954 }
955
956 /* the bandwidth is not wide enough
957 * negotiate or try a lower alternate setting */
958 retry:
959 PERR("alt %d - bandwidth not wide enough, trying again", alt);
960 msleep(20); /* wait for kill complete */
961 if (gspca_dev->sd_desc->isoc_nego) {
962 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
963 if (ret < 0)
964 goto out;
965 } else {
966 if (alt_idx <= 0) {
967 pr_err("no transfer endpoint found\n");
968 ret = -EIO;
969 goto out;
970 }
971 gspca_dev->alt = ep_tb[--alt_idx].alt;
972 }
973 }
974 out:
975 gspca_input_create_urb(gspca_dev);
976 return ret;
977 }
978
979 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
980 {
981 int i;
982
983 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
984 gspca_dev->curr_mode = i;
985 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
986
987 /* does nothing if ctrl_handler == NULL */
988 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
989 }
990
991 static int wxh_to_mode(struct gspca_dev *gspca_dev,
992 int width, int height)
993 {
994 int i;
995
996 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
997 if (width == gspca_dev->cam.cam_mode[i].width
998 && height == gspca_dev->cam.cam_mode[i].height)
999 return i;
1000 }
1001 return -EINVAL;
1002 }
1003
1004 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
1005 int width, int height)
1006 {
1007 int i;
1008
1009 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1010 if (width >= gspca_dev->cam.cam_mode[i].width
1011 && height >= gspca_dev->cam.cam_mode[i].height)
1012 break;
1013 }
1014 return i;
1015 }
1016
1017 /*
1018 * search a mode with the right pixel format
1019 */
1020 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1021 int mode,
1022 int pixfmt)
1023 {
1024 int modeU, modeD;
1025
1026 modeU = modeD = mode;
1027 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1028 if (--modeD >= 0) {
1029 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1030 == pixfmt)
1031 return modeD;
1032 }
1033 if (++modeU < gspca_dev->cam.nmodes) {
1034 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1035 == pixfmt)
1036 return modeU;
1037 }
1038 }
1039 return -EINVAL;
1040 }
1041
1042 #ifdef CONFIG_VIDEO_ADV_DEBUG
1043 static int vidioc_g_chip_info(struct file *file, void *priv,
1044 struct v4l2_dbg_chip_info *chip)
1045 {
1046 struct gspca_dev *gspca_dev = video_drvdata(file);
1047
1048 gspca_dev->usb_err = 0;
1049 if (gspca_dev->sd_desc->get_chip_info)
1050 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1051 return chip->match.addr ? -EINVAL : 0;
1052 }
1053
1054 static int vidioc_g_register(struct file *file, void *priv,
1055 struct v4l2_dbg_register *reg)
1056 {
1057 struct gspca_dev *gspca_dev = video_drvdata(file);
1058
1059 gspca_dev->usb_err = 0;
1060 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1061 }
1062
1063 static int vidioc_s_register(struct file *file, void *priv,
1064 const struct v4l2_dbg_register *reg)
1065 {
1066 struct gspca_dev *gspca_dev = video_drvdata(file);
1067
1068 gspca_dev->usb_err = 0;
1069 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1070 }
1071 #endif
1072
1073 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1074 struct v4l2_fmtdesc *fmtdesc)
1075 {
1076 struct gspca_dev *gspca_dev = video_drvdata(file);
1077 int i, j, index;
1078 __u32 fmt_tb[8];
1079
1080 /* give an index to each format */
1081 index = 0;
1082 j = 0;
1083 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1084 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1085 j = 0;
1086 for (;;) {
1087 if (fmt_tb[j] == fmt_tb[index])
1088 break;
1089 j++;
1090 }
1091 if (j == index) {
1092 if (fmtdesc->index == index)
1093 break; /* new format */
1094 index++;
1095 if (index >= ARRAY_SIZE(fmt_tb))
1096 return -EINVAL;
1097 }
1098 }
1099 if (i < 0)
1100 return -EINVAL; /* no more format */
1101
1102 fmtdesc->pixelformat = fmt_tb[index];
1103 if (gspca_dev->cam.cam_mode[i].sizeimage <
1104 gspca_dev->cam.cam_mode[i].width *
1105 gspca_dev->cam.cam_mode[i].height)
1106 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1107 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1108 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1109 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1110 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1111 fmtdesc->description[4] = '\0';
1112 return 0;
1113 }
1114
1115 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1116 struct v4l2_format *fmt)
1117 {
1118 struct gspca_dev *gspca_dev = video_drvdata(file);
1119
1120 fmt->fmt.pix = gspca_dev->pixfmt;
1121 /* some drivers use priv internally, zero it before giving it back to
1122 the core */
1123 fmt->fmt.pix.priv = 0;
1124 return 0;
1125 }
1126
1127 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1128 struct v4l2_format *fmt)
1129 {
1130 int w, h, mode, mode2;
1131
1132 w = fmt->fmt.pix.width;
1133 h = fmt->fmt.pix.height;
1134
1135 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1136 fmt->fmt.pix.pixelformat, w, h);
1137
1138 /* search the nearest mode for width and height */
1139 mode = wxh_to_nearest_mode(gspca_dev, w, h);
1140
1141 /* OK if right palette */
1142 if (gspca_dev->cam.cam_mode[mode].pixelformat
1143 != fmt->fmt.pix.pixelformat) {
1144
1145 /* else, search the closest mode with the same pixel format */
1146 mode2 = gspca_get_mode(gspca_dev, mode,
1147 fmt->fmt.pix.pixelformat);
1148 if (mode2 >= 0)
1149 mode = mode2;
1150 }
1151 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1152 if (gspca_dev->sd_desc->try_fmt) {
1153 /* pass original resolution to subdriver try_fmt */
1154 fmt->fmt.pix.width = w;
1155 fmt->fmt.pix.height = h;
1156 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1157 }
1158 /* some drivers use priv internally, zero it before giving it back to
1159 the core */
1160 fmt->fmt.pix.priv = 0;
1161 return mode; /* used when s_fmt */
1162 }
1163
1164 static int vidioc_try_fmt_vid_cap(struct file *file,
1165 void *priv,
1166 struct v4l2_format *fmt)
1167 {
1168 struct gspca_dev *gspca_dev = video_drvdata(file);
1169 int ret;
1170
1171 ret = try_fmt_vid_cap(gspca_dev, fmt);
1172 if (ret < 0)
1173 return ret;
1174 return 0;
1175 }
1176
1177 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1178 struct v4l2_format *fmt)
1179 {
1180 struct gspca_dev *gspca_dev = video_drvdata(file);
1181 int ret;
1182
1183 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1184 return -ERESTARTSYS;
1185
1186 ret = try_fmt_vid_cap(gspca_dev, fmt);
1187 if (ret < 0)
1188 goto out;
1189
1190 if (gspca_dev->nframes != 0
1191 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1192 ret = -EINVAL;
1193 goto out;
1194 }
1195
1196 if (gspca_dev->streaming) {
1197 ret = -EBUSY;
1198 goto out;
1199 }
1200 gspca_dev->curr_mode = ret;
1201 if (gspca_dev->sd_desc->try_fmt)
1202 /* subdriver try_fmt can modify format parameters */
1203 gspca_dev->pixfmt = fmt->fmt.pix;
1204 else
1205 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1206
1207 ret = 0;
1208 out:
1209 mutex_unlock(&gspca_dev->queue_lock);
1210 return ret;
1211 }
1212
1213 static int vidioc_enum_framesizes(struct file *file, void *priv,
1214 struct v4l2_frmsizeenum *fsize)
1215 {
1216 struct gspca_dev *gspca_dev = video_drvdata(file);
1217 int i;
1218 __u32 index = 0;
1219
1220 if (gspca_dev->sd_desc->enum_framesizes)
1221 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1222
1223 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1224 if (fsize->pixel_format !=
1225 gspca_dev->cam.cam_mode[i].pixelformat)
1226 continue;
1227
1228 if (fsize->index == index) {
1229 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1230 fsize->discrete.width =
1231 gspca_dev->cam.cam_mode[i].width;
1232 fsize->discrete.height =
1233 gspca_dev->cam.cam_mode[i].height;
1234 return 0;
1235 }
1236 index++;
1237 }
1238
1239 return -EINVAL;
1240 }
1241
1242 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1243 struct v4l2_frmivalenum *fival)
1244 {
1245 struct gspca_dev *gspca_dev = video_drvdata(filp);
1246 int mode;
1247 __u32 i;
1248
1249 mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1250 if (mode < 0)
1251 return -EINVAL;
1252
1253 if (gspca_dev->cam.mode_framerates == NULL ||
1254 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1255 return -EINVAL;
1256
1257 if (fival->pixel_format !=
1258 gspca_dev->cam.cam_mode[mode].pixelformat)
1259 return -EINVAL;
1260
1261 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1262 if (fival->index == i) {
1263 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1264 fival->discrete.numerator = 1;
1265 fival->discrete.denominator =
1266 gspca_dev->cam.mode_framerates[mode].rates[i];
1267 return 0;
1268 }
1269 }
1270
1271 return -EINVAL;
1272 }
1273
1274 static void gspca_release(struct v4l2_device *v4l2_device)
1275 {
1276 struct gspca_dev *gspca_dev =
1277 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1278
1279 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1280 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1281 kfree(gspca_dev->usb_buf);
1282 kfree(gspca_dev);
1283 }
1284
1285 static int dev_open(struct file *file)
1286 {
1287 struct gspca_dev *gspca_dev = video_drvdata(file);
1288 int ret;
1289
1290 PDEBUG(D_STREAM, "[%s] open", current->comm);
1291
1292 /* protect the subdriver against rmmod */
1293 if (!try_module_get(gspca_dev->module))
1294 return -ENODEV;
1295
1296 ret = v4l2_fh_open(file);
1297 if (ret)
1298 module_put(gspca_dev->module);
1299 return ret;
1300 }
1301
1302 static int dev_close(struct file *file)
1303 {
1304 struct gspca_dev *gspca_dev = video_drvdata(file);
1305
1306 PDEBUG(D_STREAM, "[%s] close", current->comm);
1307
1308 /* Needed for gspca_stream_off, always lock before queue_lock! */
1309 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1310 return -ERESTARTSYS;
1311
1312 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1313 mutex_unlock(&gspca_dev->usb_lock);
1314 return -ERESTARTSYS;
1315 }
1316
1317 /* if the file did the capture, free the streaming resources */
1318 if (gspca_dev->capt_file == file) {
1319 if (gspca_dev->streaming)
1320 gspca_stream_off(gspca_dev);
1321 frame_free(gspca_dev);
1322 }
1323 module_put(gspca_dev->module);
1324 mutex_unlock(&gspca_dev->queue_lock);
1325 mutex_unlock(&gspca_dev->usb_lock);
1326
1327 PDEBUG(D_STREAM, "close done");
1328
1329 return v4l2_fh_release(file);
1330 }
1331
1332 static int vidioc_querycap(struct file *file, void *priv,
1333 struct v4l2_capability *cap)
1334 {
1335 struct gspca_dev *gspca_dev = video_drvdata(file);
1336
1337 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1338 sizeof cap->driver);
1339 if (gspca_dev->dev->product != NULL) {
1340 strlcpy((char *) cap->card, gspca_dev->dev->product,
1341 sizeof cap->card);
1342 } else {
1343 snprintf((char *) cap->card, sizeof cap->card,
1344 "USB Camera (%04x:%04x)",
1345 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1346 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1347 }
1348 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1349 sizeof(cap->bus_info));
1350 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1351 | V4L2_CAP_STREAMING
1352 | V4L2_CAP_READWRITE;
1353 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1354 return 0;
1355 }
1356
1357 static int vidioc_enum_input(struct file *file, void *priv,
1358 struct v4l2_input *input)
1359 {
1360 struct gspca_dev *gspca_dev = video_drvdata(file);
1361
1362 if (input->index != 0)
1363 return -EINVAL;
1364 input->type = V4L2_INPUT_TYPE_CAMERA;
1365 input->status = gspca_dev->cam.input_flags;
1366 strlcpy(input->name, gspca_dev->sd_desc->name,
1367 sizeof input->name);
1368 return 0;
1369 }
1370
1371 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1372 {
1373 *i = 0;
1374 return 0;
1375 }
1376
1377 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1378 {
1379 if (i > 0)
1380 return -EINVAL;
1381 return (0);
1382 }
1383
1384 static int vidioc_reqbufs(struct file *file, void *priv,
1385 struct v4l2_requestbuffers *rb)
1386 {
1387 struct gspca_dev *gspca_dev = video_drvdata(file);
1388 int i, ret = 0, streaming;
1389
1390 i = rb->memory; /* (avoid compilation warning) */
1391 switch (i) {
1392 case GSPCA_MEMORY_READ: /* (internal call) */
1393 case V4L2_MEMORY_MMAP:
1394 case V4L2_MEMORY_USERPTR:
1395 break;
1396 default:
1397 return -EINVAL;
1398 }
1399 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1400 return -ERESTARTSYS;
1401
1402 if (gspca_dev->memory != GSPCA_MEMORY_NO
1403 && gspca_dev->memory != GSPCA_MEMORY_READ
1404 && gspca_dev->memory != rb->memory) {
1405 ret = -EBUSY;
1406 goto out;
1407 }
1408
1409 /* only one file may do the capture */
1410 if (gspca_dev->capt_file != NULL
1411 && gspca_dev->capt_file != file) {
1412 ret = -EBUSY;
1413 goto out;
1414 }
1415
1416 /* if allocated, the buffers must not be mapped */
1417 for (i = 0; i < gspca_dev->nframes; i++) {
1418 if (gspca_dev->frame[i].vma_use_count) {
1419 ret = -EBUSY;
1420 goto out;
1421 }
1422 }
1423
1424 /* stop streaming */
1425 streaming = gspca_dev->streaming;
1426 if (streaming) {
1427 gspca_stream_off(gspca_dev);
1428
1429 /* Don't restart the stream when switching from read
1430 * to mmap mode */
1431 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1432 streaming = 0;
1433 }
1434
1435 /* free the previous allocated buffers, if any */
1436 if (gspca_dev->nframes != 0)
1437 frame_free(gspca_dev);
1438 if (rb->count == 0) /* unrequest */
1439 goto out;
1440 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1441 if (ret == 0) {
1442 rb->count = gspca_dev->nframes;
1443 if (streaming)
1444 ret = gspca_init_transfer(gspca_dev);
1445 }
1446 out:
1447 mutex_unlock(&gspca_dev->queue_lock);
1448 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1449 return ret;
1450 }
1451
1452 static int vidioc_querybuf(struct file *file, void *priv,
1453 struct v4l2_buffer *v4l2_buf)
1454 {
1455 struct gspca_dev *gspca_dev = video_drvdata(file);
1456 struct gspca_frame *frame;
1457
1458 if (v4l2_buf->index >= gspca_dev->nframes)
1459 return -EINVAL;
1460
1461 frame = &gspca_dev->frame[v4l2_buf->index];
1462 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1463 return 0;
1464 }
1465
1466 static int vidioc_streamon(struct file *file, void *priv,
1467 enum v4l2_buf_type buf_type)
1468 {
1469 struct gspca_dev *gspca_dev = video_drvdata(file);
1470 int ret;
1471
1472 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1473 return -EINVAL;
1474 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1475 return -ERESTARTSYS;
1476
1477 /* check the capture file */
1478 if (gspca_dev->capt_file != file) {
1479 ret = -EBUSY;
1480 goto out;
1481 }
1482
1483 if (gspca_dev->nframes == 0
1484 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1485 ret = -EINVAL;
1486 goto out;
1487 }
1488 if (!gspca_dev->streaming) {
1489 ret = gspca_init_transfer(gspca_dev);
1490 if (ret < 0)
1491 goto out;
1492 }
1493 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1494 gspca_dev->pixfmt.pixelformat,
1495 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1496 ret = 0;
1497 out:
1498 mutex_unlock(&gspca_dev->queue_lock);
1499 return ret;
1500 }
1501
1502 static int vidioc_streamoff(struct file *file, void *priv,
1503 enum v4l2_buf_type buf_type)
1504 {
1505 struct gspca_dev *gspca_dev = video_drvdata(file);
1506 int i, ret;
1507
1508 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1509 return -EINVAL;
1510
1511 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1512 return -ERESTARTSYS;
1513
1514 if (!gspca_dev->streaming) {
1515 ret = 0;
1516 goto out;
1517 }
1518
1519 /* check the capture file */
1520 if (gspca_dev->capt_file != file) {
1521 ret = -EBUSY;
1522 goto out;
1523 }
1524
1525 /* stop streaming */
1526 gspca_stream_off(gspca_dev);
1527 /* In case another thread is waiting in dqbuf */
1528 wake_up_interruptible(&gspca_dev->wq);
1529
1530 /* empty the transfer queues */
1531 for (i = 0; i < gspca_dev->nframes; i++)
1532 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1533 atomic_set(&gspca_dev->fr_q, 0);
1534 atomic_set(&gspca_dev->fr_i, 0);
1535 gspca_dev->fr_o = 0;
1536 ret = 0;
1537 out:
1538 mutex_unlock(&gspca_dev->queue_lock);
1539 return ret;
1540 }
1541
1542 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1543 struct v4l2_jpegcompression *jpegcomp)
1544 {
1545 struct gspca_dev *gspca_dev = video_drvdata(file);
1546
1547 gspca_dev->usb_err = 0;
1548 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1549 }
1550
1551 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1552 const struct v4l2_jpegcompression *jpegcomp)
1553 {
1554 struct gspca_dev *gspca_dev = video_drvdata(file);
1555
1556 gspca_dev->usb_err = 0;
1557 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1558 }
1559
1560 static int vidioc_g_parm(struct file *filp, void *priv,
1561 struct v4l2_streamparm *parm)
1562 {
1563 struct gspca_dev *gspca_dev = video_drvdata(filp);
1564
1565 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1566
1567 if (gspca_dev->sd_desc->get_streamparm) {
1568 gspca_dev->usb_err = 0;
1569 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1570 return gspca_dev->usb_err;
1571 }
1572 return 0;
1573 }
1574
1575 static int vidioc_s_parm(struct file *filp, void *priv,
1576 struct v4l2_streamparm *parm)
1577 {
1578 struct gspca_dev *gspca_dev = video_drvdata(filp);
1579 unsigned int n;
1580
1581 n = parm->parm.capture.readbuffers;
1582 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1583 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1584 else
1585 gspca_dev->nbufread = n;
1586
1587 if (gspca_dev->sd_desc->set_streamparm) {
1588 gspca_dev->usb_err = 0;
1589 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1590 return gspca_dev->usb_err;
1591 }
1592
1593 return 0;
1594 }
1595
1596 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1597 {
1598 struct gspca_dev *gspca_dev = video_drvdata(file);
1599 struct gspca_frame *frame;
1600 struct page *page;
1601 unsigned long addr, start, size;
1602 int i, ret;
1603
1604 start = vma->vm_start;
1605 size = vma->vm_end - vma->vm_start;
1606 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1607
1608 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1609 return -ERESTARTSYS;
1610 if (gspca_dev->capt_file != file) {
1611 ret = -EINVAL;
1612 goto out;
1613 }
1614
1615 frame = NULL;
1616 for (i = 0; i < gspca_dev->nframes; ++i) {
1617 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1618 PDEBUG(D_STREAM, "mmap bad memory type");
1619 break;
1620 }
1621 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1622 == vma->vm_pgoff) {
1623 frame = &gspca_dev->frame[i];
1624 break;
1625 }
1626 }
1627 if (frame == NULL) {
1628 PDEBUG(D_STREAM, "mmap no frame buffer found");
1629 ret = -EINVAL;
1630 goto out;
1631 }
1632 if (size != frame->v4l2_buf.length) {
1633 PDEBUG(D_STREAM, "mmap bad size");
1634 ret = -EINVAL;
1635 goto out;
1636 }
1637
1638 /*
1639 * - VM_IO marks the area as being a mmaped region for I/O to a
1640 * device. It also prevents the region from being core dumped.
1641 */
1642 vma->vm_flags |= VM_IO;
1643
1644 addr = (unsigned long) frame->data;
1645 while (size > 0) {
1646 page = vmalloc_to_page((void *) addr);
1647 ret = vm_insert_page(vma, start, page);
1648 if (ret < 0)
1649 goto out;
1650 start += PAGE_SIZE;
1651 addr += PAGE_SIZE;
1652 size -= PAGE_SIZE;
1653 }
1654
1655 vma->vm_ops = &gspca_vm_ops;
1656 vma->vm_private_data = frame;
1657 gspca_vm_open(vma);
1658 ret = 0;
1659 out:
1660 mutex_unlock(&gspca_dev->queue_lock);
1661 return ret;
1662 }
1663
1664 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1665 enum v4l2_memory memory)
1666 {
1667 if (!gspca_dev->present)
1668 return -ENODEV;
1669 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1670 !gspca_dev->streaming)
1671 return -EINVAL;
1672
1673 /* check if a frame is ready */
1674 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1675 }
1676
1677 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1678 enum v4l2_memory memory)
1679 {
1680 int ret;
1681
1682 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1683 return -ERESTARTSYS;
1684 ret = frame_ready_nolock(gspca_dev, file, memory);
1685 mutex_unlock(&gspca_dev->queue_lock);
1686 return ret;
1687 }
1688
1689 /*
1690 * dequeue a video buffer
1691 *
1692 * If nonblock_ing is false, block until a buffer is available.
1693 */
1694 static int vidioc_dqbuf(struct file *file, void *priv,
1695 struct v4l2_buffer *v4l2_buf)
1696 {
1697 struct gspca_dev *gspca_dev = video_drvdata(file);
1698 struct gspca_frame *frame;
1699 int i, j, ret;
1700
1701 PDEBUG(D_FRAM, "dqbuf");
1702
1703 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1704 return -ERESTARTSYS;
1705
1706 for (;;) {
1707 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1708 if (ret < 0)
1709 goto out;
1710 if (ret > 0)
1711 break;
1712
1713 mutex_unlock(&gspca_dev->queue_lock);
1714
1715 if (file->f_flags & O_NONBLOCK)
1716 return -EAGAIN;
1717
1718 /* wait till a frame is ready */
1719 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1720 frame_ready(gspca_dev, file, v4l2_buf->memory),
1721 msecs_to_jiffies(3000));
1722 if (ret < 0)
1723 return ret;
1724 if (ret == 0)
1725 return -EIO;
1726
1727 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1728 return -ERESTARTSYS;
1729 }
1730
1731 i = gspca_dev->fr_o;
1732 j = gspca_dev->fr_queue[i];
1733 frame = &gspca_dev->frame[j];
1734
1735 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1736
1737 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1738 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1739 PDEBUG(D_FRAM, "dqbuf %d", j);
1740 ret = 0;
1741
1742 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1743 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1744 frame->data,
1745 frame->v4l2_buf.bytesused)) {
1746 PERR("dqbuf cp to user failed");
1747 ret = -EFAULT;
1748 }
1749 }
1750 out:
1751 mutex_unlock(&gspca_dev->queue_lock);
1752
1753 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1754 mutex_lock(&gspca_dev->usb_lock);
1755 gspca_dev->usb_err = 0;
1756 if (gspca_dev->present)
1757 gspca_dev->sd_desc->dq_callback(gspca_dev);
1758 mutex_unlock(&gspca_dev->usb_lock);
1759 }
1760
1761 return ret;
1762 }
1763
1764 /*
1765 * queue a video buffer
1766 *
1767 * Attempting to queue a buffer that has already been
1768 * queued will return -EINVAL.
1769 */
1770 static int vidioc_qbuf(struct file *file, void *priv,
1771 struct v4l2_buffer *v4l2_buf)
1772 {
1773 struct gspca_dev *gspca_dev = video_drvdata(file);
1774 struct gspca_frame *frame;
1775 int i, index, ret;
1776
1777 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1778
1779 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1780 return -ERESTARTSYS;
1781
1782 index = v4l2_buf->index;
1783 if ((unsigned) index >= gspca_dev->nframes) {
1784 PDEBUG(D_FRAM,
1785 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1786 ret = -EINVAL;
1787 goto out;
1788 }
1789 if (v4l2_buf->memory != gspca_dev->memory) {
1790 PDEBUG(D_FRAM, "qbuf bad memory type");
1791 ret = -EINVAL;
1792 goto out;
1793 }
1794
1795 frame = &gspca_dev->frame[index];
1796 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1797 PDEBUG(D_FRAM, "qbuf bad state");
1798 ret = -EINVAL;
1799 goto out;
1800 }
1801
1802 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1803
1804 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1805 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1806 frame->v4l2_buf.length = v4l2_buf->length;
1807 }
1808
1809 /* put the buffer in the 'queued' queue */
1810 i = atomic_read(&gspca_dev->fr_q);
1811 gspca_dev->fr_queue[i] = index;
1812 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1813
1814 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1815 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1816 ret = 0;
1817 out:
1818 mutex_unlock(&gspca_dev->queue_lock);
1819 return ret;
1820 }
1821
1822 /*
1823 * allocate the resources for read()
1824 */
1825 static int read_alloc(struct gspca_dev *gspca_dev,
1826 struct file *file)
1827 {
1828 struct v4l2_buffer v4l2_buf;
1829 int i, ret;
1830
1831 PDEBUG(D_STREAM, "read alloc");
1832
1833 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1834 return -ERESTARTSYS;
1835
1836 if (gspca_dev->nframes == 0) {
1837 struct v4l2_requestbuffers rb;
1838
1839 memset(&rb, 0, sizeof rb);
1840 rb.count = gspca_dev->nbufread;
1841 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1842 rb.memory = GSPCA_MEMORY_READ;
1843 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1844 if (ret != 0) {
1845 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1846 goto out;
1847 }
1848 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1849 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1850 v4l2_buf.memory = GSPCA_MEMORY_READ;
1851 for (i = 0; i < gspca_dev->nbufread; i++) {
1852 v4l2_buf.index = i;
1853 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1854 if (ret != 0) {
1855 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1856 goto out;
1857 }
1858 }
1859 }
1860
1861 /* start streaming */
1862 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1863 if (ret != 0)
1864 PDEBUG(D_STREAM, "read streamon err %d", ret);
1865 out:
1866 mutex_unlock(&gspca_dev->usb_lock);
1867 return ret;
1868 }
1869
1870 static unsigned int dev_poll(struct file *file, poll_table *wait)
1871 {
1872 struct gspca_dev *gspca_dev = video_drvdata(file);
1873 unsigned long req_events = poll_requested_events(wait);
1874 int ret = 0;
1875
1876 PDEBUG(D_FRAM, "poll");
1877
1878 if (req_events & POLLPRI)
1879 ret |= v4l2_ctrl_poll(file, wait);
1880
1881 if (req_events & (POLLIN | POLLRDNORM)) {
1882 /* if reqbufs is not done, the user would use read() */
1883 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1884 if (read_alloc(gspca_dev, file) != 0) {
1885 ret |= POLLERR;
1886 goto out;
1887 }
1888 }
1889
1890 poll_wait(file, &gspca_dev->wq, wait);
1891
1892 /* check if an image has been received */
1893 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1894 ret |= POLLERR;
1895 goto out;
1896 }
1897 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1898 ret |= POLLIN | POLLRDNORM;
1899 mutex_unlock(&gspca_dev->queue_lock);
1900 }
1901
1902 out:
1903 if (!gspca_dev->present)
1904 ret |= POLLHUP;
1905
1906 return ret;
1907 }
1908
1909 static ssize_t dev_read(struct file *file, char __user *data,
1910 size_t count, loff_t *ppos)
1911 {
1912 struct gspca_dev *gspca_dev = video_drvdata(file);
1913 struct gspca_frame *frame;
1914 struct v4l2_buffer v4l2_buf;
1915 struct timeval timestamp;
1916 int n, ret, ret2;
1917
1918 PDEBUG(D_FRAM, "read (%zd)", count);
1919 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1920 ret = read_alloc(gspca_dev, file);
1921 if (ret != 0)
1922 return ret;
1923 }
1924
1925 /* get a frame */
1926 v4l2_get_timestamp(&timestamp);
1927 timestamp.tv_sec--;
1928 n = 2;
1929 for (;;) {
1930 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1931 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1932 v4l2_buf.memory = GSPCA_MEMORY_READ;
1933 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1934 if (ret != 0) {
1935 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1936 return ret;
1937 }
1938
1939 /* if the process slept for more than 1 second,
1940 * get a newer frame */
1941 frame = &gspca_dev->frame[v4l2_buf.index];
1942 if (--n < 0)
1943 break; /* avoid infinite loop */
1944 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1945 break;
1946 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1947 if (ret != 0) {
1948 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1949 return ret;
1950 }
1951 }
1952
1953 /* copy the frame */
1954 if (count > frame->v4l2_buf.bytesused)
1955 count = frame->v4l2_buf.bytesused;
1956 ret = copy_to_user(data, frame->data, count);
1957 if (ret != 0) {
1958 PERR("read cp to user lack %d / %zd", ret, count);
1959 ret = -EFAULT;
1960 goto out;
1961 }
1962 ret = count;
1963 out:
1964 /* in each case, requeue the buffer */
1965 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1966 if (ret2 != 0)
1967 return ret2;
1968 return ret;
1969 }
1970
1971 static struct v4l2_file_operations dev_fops = {
1972 .owner = THIS_MODULE,
1973 .open = dev_open,
1974 .release = dev_close,
1975 .read = dev_read,
1976 .mmap = dev_mmap,
1977 .unlocked_ioctl = video_ioctl2,
1978 .poll = dev_poll,
1979 };
1980
1981 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1982 .vidioc_querycap = vidioc_querycap,
1983 .vidioc_dqbuf = vidioc_dqbuf,
1984 .vidioc_qbuf = vidioc_qbuf,
1985 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1986 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1987 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1988 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1989 .vidioc_streamon = vidioc_streamon,
1990 .vidioc_enum_input = vidioc_enum_input,
1991 .vidioc_g_input = vidioc_g_input,
1992 .vidioc_s_input = vidioc_s_input,
1993 .vidioc_reqbufs = vidioc_reqbufs,
1994 .vidioc_querybuf = vidioc_querybuf,
1995 .vidioc_streamoff = vidioc_streamoff,
1996 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1997 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1998 .vidioc_g_parm = vidioc_g_parm,
1999 .vidioc_s_parm = vidioc_s_parm,
2000 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2001 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2002 #ifdef CONFIG_VIDEO_ADV_DEBUG
2003 .vidioc_g_chip_info = vidioc_g_chip_info,
2004 .vidioc_g_register = vidioc_g_register,
2005 .vidioc_s_register = vidioc_s_register,
2006 #endif
2007 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2008 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2009 };
2010
2011 static const struct video_device gspca_template = {
2012 .name = "gspca main driver",
2013 .fops = &dev_fops,
2014 .ioctl_ops = &dev_ioctl_ops,
2015 .release = video_device_release_empty, /* We use v4l2_dev.release */
2016 };
2017
2018 /*
2019 * probe and create a new gspca device
2020 *
2021 * This function must be called by the sub-driver when it is
2022 * called for probing a new device.
2023 */
2024 int gspca_dev_probe2(struct usb_interface *intf,
2025 const struct usb_device_id *id,
2026 const struct sd_desc *sd_desc,
2027 int dev_size,
2028 struct module *module)
2029 {
2030 struct gspca_dev *gspca_dev;
2031 struct usb_device *dev = interface_to_usbdev(intf);
2032 int ret;
2033
2034 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2035 sd_desc->name, id->idVendor, id->idProduct);
2036
2037 /* create the device */
2038 if (dev_size < sizeof *gspca_dev)
2039 dev_size = sizeof *gspca_dev;
2040 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2041 if (!gspca_dev) {
2042 pr_err("couldn't kzalloc gspca struct\n");
2043 return -ENOMEM;
2044 }
2045 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2046 if (!gspca_dev->usb_buf) {
2047 pr_err("out of memory\n");
2048 ret = -ENOMEM;
2049 goto out;
2050 }
2051 gspca_dev->dev = dev;
2052 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2053 gspca_dev->xfer_ep = -1;
2054
2055 /* check if any audio device */
2056 if (dev->actconfig->desc.bNumInterfaces != 1) {
2057 int i;
2058 struct usb_interface *intf2;
2059
2060 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2061 intf2 = dev->actconfig->interface[i];
2062 if (intf2 != NULL
2063 && intf2->altsetting != NULL
2064 && intf2->altsetting->desc.bInterfaceClass ==
2065 USB_CLASS_AUDIO) {
2066 gspca_dev->audio = 1;
2067 break;
2068 }
2069 }
2070 }
2071
2072 gspca_dev->v4l2_dev.release = gspca_release;
2073 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2074 if (ret)
2075 goto out;
2076 gspca_dev->sd_desc = sd_desc;
2077 gspca_dev->nbufread = 2;
2078 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2079 gspca_dev->vdev = gspca_template;
2080 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2081 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2082 gspca_dev->module = module;
2083 gspca_dev->present = 1;
2084
2085 mutex_init(&gspca_dev->usb_lock);
2086 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2087 mutex_init(&gspca_dev->queue_lock);
2088 init_waitqueue_head(&gspca_dev->wq);
2089
2090 /* configure the subdriver and initialize the USB device */
2091 ret = sd_desc->config(gspca_dev, id);
2092 if (ret < 0)
2093 goto out;
2094 ret = sd_desc->init(gspca_dev);
2095 if (ret < 0)
2096 goto out;
2097 if (sd_desc->init_controls)
2098 ret = sd_desc->init_controls(gspca_dev);
2099 if (ret < 0)
2100 goto out;
2101 gspca_set_default_mode(gspca_dev);
2102
2103 ret = gspca_input_connect(gspca_dev);
2104 if (ret)
2105 goto out;
2106
2107 /*
2108 * Don't take usb_lock for these ioctls. This improves latency if
2109 * usb_lock is taken for a long time, e.g. when changing a control
2110 * value, and a new frame is ready to be dequeued.
2111 */
2112 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2113 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2114 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2115 #ifdef CONFIG_VIDEO_ADV_DEBUG
2116 if (!gspca_dev->sd_desc->get_register)
2117 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2118 if (!gspca_dev->sd_desc->set_register)
2119 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2120 #endif
2121 if (!gspca_dev->sd_desc->get_jcomp)
2122 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2123 if (!gspca_dev->sd_desc->set_jcomp)
2124 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2125
2126 /* init video stuff */
2127 ret = video_register_device(&gspca_dev->vdev,
2128 VFL_TYPE_GRABBER,
2129 -1);
2130 if (ret < 0) {
2131 pr_err("video_register_device err %d\n", ret);
2132 goto out;
2133 }
2134
2135 usb_set_intfdata(intf, gspca_dev);
2136 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2137
2138 gspca_input_create_urb(gspca_dev);
2139
2140 return 0;
2141 out:
2142 #if IS_ENABLED(CONFIG_INPUT)
2143 if (gspca_dev->input_dev)
2144 input_unregister_device(gspca_dev->input_dev);
2145 #endif
2146 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2147 kfree(gspca_dev->usb_buf);
2148 kfree(gspca_dev);
2149 return ret;
2150 }
2151 EXPORT_SYMBOL(gspca_dev_probe2);
2152
2153 /* same function as the previous one, but check the interface */
2154 int gspca_dev_probe(struct usb_interface *intf,
2155 const struct usb_device_id *id,
2156 const struct sd_desc *sd_desc,
2157 int dev_size,
2158 struct module *module)
2159 {
2160 struct usb_device *dev = interface_to_usbdev(intf);
2161
2162 /* we don't handle multi-config cameras */
2163 if (dev->descriptor.bNumConfigurations != 1) {
2164 pr_err("%04x:%04x too many config\n",
2165 id->idVendor, id->idProduct);
2166 return -ENODEV;
2167 }
2168
2169 /* the USB video interface must be the first one */
2170 if (dev->actconfig->desc.bNumInterfaces != 1
2171 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2172 return -ENODEV;
2173
2174 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2175 }
2176 EXPORT_SYMBOL(gspca_dev_probe);
2177
2178 /*
2179 * USB disconnection
2180 *
2181 * This function must be called by the sub-driver
2182 * when the device disconnects, after the specific resources are freed.
2183 */
2184 void gspca_disconnect(struct usb_interface *intf)
2185 {
2186 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2187 #if IS_ENABLED(CONFIG_INPUT)
2188 struct input_dev *input_dev;
2189 #endif
2190
2191 PDEBUG(D_PROBE, "%s disconnect",
2192 video_device_node_name(&gspca_dev->vdev));
2193
2194 mutex_lock(&gspca_dev->usb_lock);
2195
2196 gspca_dev->present = 0;
2197 destroy_urbs(gspca_dev);
2198
2199 #if IS_ENABLED(CONFIG_INPUT)
2200 gspca_input_destroy_urb(gspca_dev);
2201 input_dev = gspca_dev->input_dev;
2202 if (input_dev) {
2203 gspca_dev->input_dev = NULL;
2204 input_unregister_device(input_dev);
2205 }
2206 #endif
2207 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2208 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2209 gspca_dev->sd_desc->stop0(gspca_dev);
2210 gspca_dev->streaming = 0;
2211 gspca_dev->dev = NULL;
2212 wake_up_interruptible(&gspca_dev->wq);
2213
2214 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2215 video_unregister_device(&gspca_dev->vdev);
2216
2217 mutex_unlock(&gspca_dev->usb_lock);
2218
2219 /* (this will call gspca_release() immediately or on last close) */
2220 v4l2_device_put(&gspca_dev->v4l2_dev);
2221 }
2222 EXPORT_SYMBOL(gspca_disconnect);
2223
2224 #ifdef CONFIG_PM
2225 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2226 {
2227 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2228
2229 gspca_input_destroy_urb(gspca_dev);
2230
2231 if (!gspca_dev->streaming)
2232 return 0;
2233
2234 mutex_lock(&gspca_dev->usb_lock);
2235 gspca_dev->frozen = 1; /* avoid urb error messages */
2236 gspca_dev->usb_err = 0;
2237 if (gspca_dev->sd_desc->stopN)
2238 gspca_dev->sd_desc->stopN(gspca_dev);
2239 destroy_urbs(gspca_dev);
2240 gspca_set_alt0(gspca_dev);
2241 if (gspca_dev->sd_desc->stop0)
2242 gspca_dev->sd_desc->stop0(gspca_dev);
2243 mutex_unlock(&gspca_dev->usb_lock);
2244
2245 return 0;
2246 }
2247 EXPORT_SYMBOL(gspca_suspend);
2248
2249 int gspca_resume(struct usb_interface *intf)
2250 {
2251 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2252 int streaming, ret = 0;
2253
2254 mutex_lock(&gspca_dev->usb_lock);
2255 gspca_dev->frozen = 0;
2256 gspca_dev->usb_err = 0;
2257 gspca_dev->sd_desc->init(gspca_dev);
2258 /*
2259 * Most subdrivers send all ctrl values on sd_start and thus
2260 * only write to the device registers on s_ctrl when streaming ->
2261 * Clear streaming to avoid setting all ctrls twice.
2262 */
2263 streaming = gspca_dev->streaming;
2264 gspca_dev->streaming = 0;
2265 if (streaming)
2266 ret = gspca_init_transfer(gspca_dev);
2267 else
2268 gspca_input_create_urb(gspca_dev);
2269 mutex_unlock(&gspca_dev->usb_lock);
2270
2271 return ret;
2272 }
2273 EXPORT_SYMBOL(gspca_resume);
2274 #endif
2275
2276 /* -- module insert / remove -- */
2277 static int __init gspca_init(void)
2278 {
2279 pr_info("v" GSPCA_VERSION " registered\n");
2280 return 0;
2281 }
2282 static void __exit gspca_exit(void)
2283 {
2284 }
2285
2286 module_init(gspca_init);
2287 module_exit(gspca_exit);
2288
2289 module_param_named(debug, gspca_debug, int, 0644);
2290 MODULE_PARM_DESC(debug,
2291 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
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