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Linux 4.14.51
[linux/fpc-iii.git] / drivers / media / usb / gspca / gspca.c
blob0f141762abf17c6d2c8c703863bb82dbee757094
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
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #define GSPCA_VERSION "2.14.0"
23
24 #include <linux/init.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/ktime.h>
36 #include <media/v4l2-ioctl.h>
37 #include <media/v4l2-ctrls.h>
38 #include <media/v4l2-fh.h>
39 #include <media/v4l2-event.h>
40
41 #include "gspca.h"
42
43 #if IS_ENABLED(CONFIG_INPUT)
44 #include <linux/input.h>
45 #include <linux/usb/input.h>
46 #endif
47
48 /* global values */
49 #define DEF_NURBS 3 /* default number of URBs */
50 #if DEF_NURBS > MAX_NURBS
51 #error "DEF_NURBS too big"
52 #endif
53
54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
56 MODULE_LICENSE("GPL");
57 MODULE_VERSION(GSPCA_VERSION);
58
59 int gspca_debug;
60 EXPORT_SYMBOL(gspca_debug);
61
62 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
63 __u32 pixfmt, int w, int h)
64 {
65 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
66 PDEBUG(debug, "%s %c%c%c%c %dx%d",
67 txt,
68 pixfmt & 0xff,
69 (pixfmt >> 8) & 0xff,
70 (pixfmt >> 16) & 0xff,
71 pixfmt >> 24,
72 w, h);
73 } else {
74 PDEBUG(debug, "%s 0x%08x %dx%d",
75 txt,
76 pixfmt,
77 w, h);
78 }
79 }
80
81 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
82 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
83 #define GSPCA_MEMORY_READ 7
84
85 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
86
87 /*
88 * VMA operations.
89 */
90 static void gspca_vm_open(struct vm_area_struct *vma)
91 {
92 struct gspca_frame *frame = vma->vm_private_data;
93
94 frame->vma_use_count++;
95 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
96 }
97
98 static void gspca_vm_close(struct vm_area_struct *vma)
99 {
100 struct gspca_frame *frame = vma->vm_private_data;
101
102 if (--frame->vma_use_count <= 0)
103 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
104 }
105
106 static const struct vm_operations_struct gspca_vm_ops = {
107 .open = gspca_vm_open,
108 .close = gspca_vm_close,
109 };
110
111 /*
112 * Input and interrupt endpoint handling functions
113 */
114 #if IS_ENABLED(CONFIG_INPUT)
115 static void int_irq(struct urb *urb)
116 {
117 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
118 int ret;
119
120 ret = urb->status;
121 switch (ret) {
122 case 0:
123 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
124 urb->transfer_buffer, urb->actual_length) < 0) {
125 PERR("Unknown packet received");
126 }
127 break;
128
129 case -ENOENT:
130 case -ECONNRESET:
131 case -ENODEV:
132 case -ESHUTDOWN:
133 /* Stop is requested either by software or hardware is gone,
134 * keep the ret value non-zero and don't resubmit later.
135 */
136 break;
137
138 default:
139 PERR("URB error %i, resubmitting", urb->status);
140 urb->status = 0;
141 ret = 0;
142 }
143
144 if (ret == 0) {
145 ret = usb_submit_urb(urb, GFP_ATOMIC);
146 if (ret < 0)
147 pr_err("Resubmit URB failed with error %i\n", ret);
148 }
149 }
150
151 static int gspca_input_connect(struct gspca_dev *dev)
152 {
153 struct input_dev *input_dev;
154 int err = 0;
155
156 dev->input_dev = NULL;
157 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
158 input_dev = input_allocate_device();
159 if (!input_dev)
160 return -ENOMEM;
161
162 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
163 strlcat(dev->phys, "/input0", sizeof(dev->phys));
164
165 input_dev->name = dev->sd_desc->name;
166 input_dev->phys = dev->phys;
167
168 usb_to_input_id(dev->dev, &input_dev->id);
169
170 input_dev->evbit[0] = BIT_MASK(EV_KEY);
171 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
172 input_dev->dev.parent = &dev->dev->dev;
173
174 err = input_register_device(input_dev);
175 if (err) {
176 pr_err("Input device registration failed with error %i\n",
177 err);
178 input_dev->dev.parent = NULL;
179 input_free_device(input_dev);
180 } else {
181 dev->input_dev = input_dev;
182 }
183 }
184
185 return err;
186 }
187
188 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
189 struct usb_endpoint_descriptor *ep)
190 {
191 unsigned int buffer_len;
192 int interval;
193 struct urb *urb;
194 struct usb_device *dev;
195 void *buffer = NULL;
196 int ret = -EINVAL;
197
198 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
199 interval = ep->bInterval;
200 PDEBUG(D_CONF, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u",
201 ep->bEndpointAddress, buffer_len, interval);
202
203 dev = gspca_dev->dev;
204
205 urb = usb_alloc_urb(0, GFP_KERNEL);
206 if (!urb) {
207 ret = -ENOMEM;
208 goto error;
209 }
210
211 buffer = usb_alloc_coherent(dev, buffer_len,
212 GFP_KERNEL, &urb->transfer_dma);
213 if (!buffer) {
214 ret = -ENOMEM;
215 goto error_buffer;
216 }
217 usb_fill_int_urb(urb, dev,
218 usb_rcvintpipe(dev, ep->bEndpointAddress),
219 buffer, buffer_len,
220 int_irq, (void *)gspca_dev, interval);
221 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
222 ret = usb_submit_urb(urb, GFP_KERNEL);
223 if (ret < 0) {
224 PERR("submit int URB failed with error %i", ret);
225 goto error_submit;
226 }
227 gspca_dev->int_urb = urb;
228 return ret;
229
230 error_submit:
231 usb_free_coherent(dev,
232 urb->transfer_buffer_length,
233 urb->transfer_buffer,
234 urb->transfer_dma);
235 error_buffer:
236 usb_free_urb(urb);
237 error:
238 return ret;
239 }
240
241 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
242 {
243 struct usb_interface *intf;
244 struct usb_host_interface *intf_desc;
245 struct usb_endpoint_descriptor *ep;
246 int i;
247
248 if (gspca_dev->sd_desc->int_pkt_scan) {
249 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
250 intf_desc = intf->cur_altsetting;
251 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
252 ep = &intf_desc->endpoint[i].desc;
253 if (usb_endpoint_dir_in(ep) &&
254 usb_endpoint_xfer_int(ep)) {
255
256 alloc_and_submit_int_urb(gspca_dev, ep);
257 break;
258 }
259 }
260 }
261 }
262
263 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
264 {
265 struct urb *urb;
266
267 urb = gspca_dev->int_urb;
268 if (urb) {
269 gspca_dev->int_urb = NULL;
270 usb_kill_urb(urb);
271 usb_free_coherent(gspca_dev->dev,
272 urb->transfer_buffer_length,
273 urb->transfer_buffer,
274 urb->transfer_dma);
275 usb_free_urb(urb);
276 }
277 }
278 #else
279 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
280 {
281 }
282
283 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
284 {
285 }
286
287 static inline int gspca_input_connect(struct gspca_dev *dev)
288 {
289 return 0;
290 }
291 #endif
292
293 /*
294 * fill a video frame from an URB and resubmit
295 */
296 static void fill_frame(struct gspca_dev *gspca_dev,
297 struct urb *urb)
298 {
299 u8 *data; /* address of data in the iso message */
300 int i, len, st;
301 cam_pkt_op pkt_scan;
302
303 if (urb->status != 0) {
304 if (urb->status == -ESHUTDOWN)
305 return; /* disconnection */
306 #ifdef CONFIG_PM
307 if (gspca_dev->frozen)
308 return;
309 #endif
310 PERR("urb status: %d", urb->status);
311 urb->status = 0;
312 goto resubmit;
313 }
314 pkt_scan = gspca_dev->sd_desc->pkt_scan;
315 for (i = 0; i < urb->number_of_packets; i++) {
316 len = urb->iso_frame_desc[i].actual_length;
317
318 /* check the packet status and length */
319 st = urb->iso_frame_desc[i].status;
320 if (st) {
321 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
322 i, len, st);
323 gspca_dev->last_packet_type = DISCARD_PACKET;
324 continue;
325 }
326 if (len == 0) {
327 if (gspca_dev->empty_packet == 0)
328 gspca_dev->empty_packet = 1;
329 continue;
330 }
331
332 /* let the packet be analyzed by the subdriver */
333 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
334 i, urb->iso_frame_desc[i].offset, len);
335 data = (u8 *) urb->transfer_buffer
336 + urb->iso_frame_desc[i].offset;
337 pkt_scan(gspca_dev, data, len);
338 }
339
340 resubmit:
341 /* resubmit the URB */
342 st = usb_submit_urb(urb, GFP_ATOMIC);
343 if (st < 0)
344 pr_err("usb_submit_urb() ret %d\n", st);
345 }
346
347 /*
348 * ISOC message interrupt from the USB device
349 *
350 * Analyse each packet and call the subdriver for copy to the frame buffer.
351 */
352 static void isoc_irq(struct urb *urb)
353 {
354 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
355
356 PDEBUG(D_PACK, "isoc irq");
357 if (!gspca_dev->streaming)
358 return;
359 fill_frame(gspca_dev, urb);
360 }
361
362 /*
363 * bulk message interrupt from the USB device
364 */
365 static void bulk_irq(struct urb *urb)
366 {
367 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
368 int st;
369
370 PDEBUG(D_PACK, "bulk irq");
371 if (!gspca_dev->streaming)
372 return;
373 switch (urb->status) {
374 case 0:
375 break;
376 case -ESHUTDOWN:
377 return; /* disconnection */
378 default:
379 #ifdef CONFIG_PM
380 if (gspca_dev->frozen)
381 return;
382 #endif
383 PERR("urb status: %d", urb->status);
384 urb->status = 0;
385 goto resubmit;
386 }
387
388 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
389 gspca_dev->sd_desc->pkt_scan(gspca_dev,
390 urb->transfer_buffer,
391 urb->actual_length);
392
393 resubmit:
394 /* resubmit the URB */
395 if (gspca_dev->cam.bulk_nurbs != 0) {
396 st = usb_submit_urb(urb, GFP_ATOMIC);
397 if (st < 0)
398 pr_err("usb_submit_urb() ret %d\n", st);
399 }
400 }
401
402 /*
403 * add data to the current frame
404 *
405 * This function is called by the subdrivers at interrupt level.
406 *
407 * To build a frame, these ones must add
408 * - one FIRST_PACKET
409 * - 0 or many INTER_PACKETs
410 * - one LAST_PACKET
411 * DISCARD_PACKET invalidates the whole frame.
412 */
413 void gspca_frame_add(struct gspca_dev *gspca_dev,
414 enum gspca_packet_type packet_type,
415 const u8 *data,
416 int len)
417 {
418 struct gspca_frame *frame;
419 int i, j;
420
421 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
422
423 if (packet_type == FIRST_PACKET) {
424 i = atomic_read(&gspca_dev->fr_i);
425
426 /* if there are no queued buffer, discard the whole frame */
427 if (i == atomic_read(&gspca_dev->fr_q)) {
428 gspca_dev->last_packet_type = DISCARD_PACKET;
429 gspca_dev->sequence++;
430 return;
431 }
432 j = gspca_dev->fr_queue[i];
433 frame = &gspca_dev->frame[j];
434 v4l2_get_timestamp(&frame->v4l2_buf.timestamp);
435 frame->v4l2_buf.sequence = gspca_dev->sequence++;
436 gspca_dev->image = frame->data;
437 gspca_dev->image_len = 0;
438 } else {
439 switch (gspca_dev->last_packet_type) {
440 case DISCARD_PACKET:
441 if (packet_type == LAST_PACKET) {
442 gspca_dev->last_packet_type = packet_type;
443 gspca_dev->image = NULL;
444 gspca_dev->image_len = 0;
445 }
446 return;
447 case LAST_PACKET:
448 return;
449 }
450 }
451
452 /* append the packet to the frame buffer */
453 if (len > 0) {
454 if (gspca_dev->image_len + len > gspca_dev->frsz) {
455 PERR("frame overflow %d > %d",
456 gspca_dev->image_len + len,
457 gspca_dev->frsz);
458 packet_type = DISCARD_PACKET;
459 } else {
460 /* !! image is NULL only when last pkt is LAST or DISCARD
461 if (gspca_dev->image == NULL) {
462 pr_err("gspca_frame_add() image == NULL\n");
463 return;
464 }
465 */
466 memcpy(gspca_dev->image + gspca_dev->image_len,
467 data, len);
468 gspca_dev->image_len += len;
469 }
470 }
471 gspca_dev->last_packet_type = packet_type;
472
473 /* if last packet, invalidate packet concatenation until
474 * next first packet, wake up the application and advance
475 * in the queue */
476 if (packet_type == LAST_PACKET) {
477 i = atomic_read(&gspca_dev->fr_i);
478 j = gspca_dev->fr_queue[i];
479 frame = &gspca_dev->frame[j];
480 frame->v4l2_buf.bytesused = gspca_dev->image_len;
481 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
482 | V4L2_BUF_FLAG_DONE)
483 & ~V4L2_BUF_FLAG_QUEUED;
484 i = (i + 1) % GSPCA_MAX_FRAMES;
485 atomic_set(&gspca_dev->fr_i, i);
486 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
487 PDEBUG(D_FRAM, "frame complete len:%d",
488 frame->v4l2_buf.bytesused);
489 gspca_dev->image = NULL;
490 gspca_dev->image_len = 0;
491 }
492 }
493 EXPORT_SYMBOL(gspca_frame_add);
494
495 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
496 enum v4l2_memory memory, unsigned int count)
497 {
498 struct gspca_frame *frame;
499 unsigned int frsz;
500 int i;
501
502 frsz = gspca_dev->pixfmt.sizeimage;
503 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
504 frsz = PAGE_ALIGN(frsz);
505 if (count >= GSPCA_MAX_FRAMES)
506 count = GSPCA_MAX_FRAMES - 1;
507 gspca_dev->frbuf = vmalloc_32(frsz * count);
508 if (!gspca_dev->frbuf) {
509 pr_err("frame alloc failed\n");
510 return -ENOMEM;
511 }
512 gspca_dev->capt_file = file;
513 gspca_dev->memory = memory;
514 gspca_dev->frsz = frsz;
515 gspca_dev->nframes = count;
516 for (i = 0; i < count; i++) {
517 frame = &gspca_dev->frame[i];
518 frame->v4l2_buf.index = i;
519 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
520 frame->v4l2_buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
521 frame->v4l2_buf.field = V4L2_FIELD_NONE;
522 frame->v4l2_buf.length = frsz;
523 frame->v4l2_buf.memory = memory;
524 frame->v4l2_buf.sequence = 0;
525 frame->data = gspca_dev->frbuf + i * frsz;
526 frame->v4l2_buf.m.offset = i * frsz;
527 }
528 atomic_set(&gspca_dev->fr_q, 0);
529 atomic_set(&gspca_dev->fr_i, 0);
530 gspca_dev->fr_o = 0;
531 return 0;
532 }
533
534 static void frame_free(struct gspca_dev *gspca_dev)
535 {
536 int i;
537
538 PDEBUG(D_STREAM, "frame free");
539 if (gspca_dev->frbuf != NULL) {
540 vfree(gspca_dev->frbuf);
541 gspca_dev->frbuf = NULL;
542 for (i = 0; i < gspca_dev->nframes; i++)
543 gspca_dev->frame[i].data = NULL;
544 }
545 gspca_dev->nframes = 0;
546 gspca_dev->frsz = 0;
547 gspca_dev->capt_file = NULL;
548 gspca_dev->memory = GSPCA_MEMORY_NO;
549 }
550
551 static void destroy_urbs(struct gspca_dev *gspca_dev)
552 {
553 struct urb *urb;
554 unsigned int i;
555
556 PDEBUG(D_STREAM, "kill transfer");
557 for (i = 0; i < MAX_NURBS; i++) {
558 urb = gspca_dev->urb[i];
559 if (urb == NULL)
560 break;
561
562 gspca_dev->urb[i] = NULL;
563 usb_kill_urb(urb);
564 usb_free_coherent(gspca_dev->dev,
565 urb->transfer_buffer_length,
566 urb->transfer_buffer,
567 urb->transfer_dma);
568 usb_free_urb(urb);
569 }
570 }
571
572 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
573 {
574 int ret;
575
576 if (gspca_dev->alt == 0)
577 return 0;
578 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
579 if (ret < 0)
580 pr_err("set alt 0 err %d\n", ret);
581 return ret;
582 }
583
584 /* Note: both the queue and the usb locks should be held when calling this */
585 static void gspca_stream_off(struct gspca_dev *gspca_dev)
586 {
587 gspca_dev->streaming = 0;
588 gspca_dev->usb_err = 0;
589 if (gspca_dev->sd_desc->stopN)
590 gspca_dev->sd_desc->stopN(gspca_dev);
591 destroy_urbs(gspca_dev);
592 gspca_input_destroy_urb(gspca_dev);
593 gspca_set_alt0(gspca_dev);
594 gspca_input_create_urb(gspca_dev);
595 if (gspca_dev->sd_desc->stop0)
596 gspca_dev->sd_desc->stop0(gspca_dev);
597 PDEBUG(D_STREAM, "stream off OK");
598 }
599
600 /*
601 * look for an input transfer endpoint in an alternate setting.
602 *
603 * If xfer_ep is invalid, return the first valid ep found, otherwise
604 * look for exactly the ep with address equal to xfer_ep.
605 */
606 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
607 int xfer, int xfer_ep)
608 {
609 struct usb_host_endpoint *ep;
610 int i, attr;
611
612 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
613 ep = &alt->endpoint[i];
614 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
615 if (attr == xfer
616 && ep->desc.wMaxPacketSize != 0
617 && usb_endpoint_dir_in(&ep->desc)
618 && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
619 return ep;
620 }
621 return NULL;
622 }
623
624 /* compute the minimum bandwidth for the current transfer */
625 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
626 {
627 u32 bandwidth;
628
629 /* get the (max) image size */
630 bandwidth = gspca_dev->pixfmt.sizeimage;
631
632 /* if the image is compressed, estimate its mean size */
633 if (!gspca_dev->cam.needs_full_bandwidth &&
634 bandwidth < gspca_dev->pixfmt.width *
635 gspca_dev->pixfmt.height)
636 bandwidth = bandwidth * 3 / 8; /* 0.375 */
637
638 /* estimate the frame rate */
639 if (gspca_dev->sd_desc->get_streamparm) {
640 struct v4l2_streamparm parm;
641
642 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
643 bandwidth *= parm.parm.capture.timeperframe.denominator;
644 bandwidth /= parm.parm.capture.timeperframe.numerator;
645 } else {
646
647 /* don't hope more than 15 fps with USB 1.1 and
648 * image resolution >= 640x480 */
649 if (gspca_dev->pixfmt.width >= 640
650 && gspca_dev->dev->speed == USB_SPEED_FULL)
651 bandwidth *= 15; /* 15 fps */
652 else
653 bandwidth *= 30; /* 30 fps */
654 }
655
656 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
657 return bandwidth;
658 }
659
660 /* endpoint table */
661 #define MAX_ALT 16
662 struct ep_tb_s {
663 u32 alt;
664 u32 bandwidth;
665 };
666
667 /*
668 * build the table of the endpoints
669 * and compute the minimum bandwidth for the image transfer
670 */
671 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
672 struct usb_interface *intf,
673 struct ep_tb_s *ep_tb)
674 {
675 struct usb_host_endpoint *ep;
676 int i, j, nbalt, psize, found;
677 u32 bandwidth, last_bw;
678
679 nbalt = intf->num_altsetting;
680 if (nbalt > MAX_ALT)
681 nbalt = MAX_ALT; /* fixme: should warn */
682
683 /* build the endpoint table */
684 i = 0;
685 last_bw = 0;
686 for (;;) {
687 ep_tb->bandwidth = 2000 * 2000 * 120;
688 found = 0;
689 for (j = 0; j < nbalt; j++) {
690 ep = alt_xfer(&intf->altsetting[j],
691 USB_ENDPOINT_XFER_ISOC,
692 gspca_dev->xfer_ep);
693 if (ep == NULL)
694 continue;
695 if (ep->desc.bInterval == 0) {
696 pr_err("alt %d iso endp with 0 interval\n", j);
697 continue;
698 }
699 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
700 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
701 bandwidth = psize * 1000;
702 if (gspca_dev->dev->speed == USB_SPEED_HIGH
703 || gspca_dev->dev->speed >= USB_SPEED_SUPER)
704 bandwidth *= 8;
705 bandwidth /= 1 << (ep->desc.bInterval - 1);
706 if (bandwidth <= last_bw)
707 continue;
708 if (bandwidth < ep_tb->bandwidth) {
709 ep_tb->bandwidth = bandwidth;
710 ep_tb->alt = j;
711 found = 1;
712 }
713 }
714 if (!found)
715 break;
716 PDEBUG(D_STREAM, "alt %d bandwidth %d",
717 ep_tb->alt, ep_tb->bandwidth);
718 last_bw = ep_tb->bandwidth;
719 i++;
720 ep_tb++;
721 }
722
723 /*
724 * If the camera:
725 * has a usb audio class interface (a built in usb mic); and
726 * is a usb 1 full speed device; and
727 * uses the max full speed iso bandwidth; and
728 * and has more than 1 alt setting
729 * then skip the highest alt setting to spare bandwidth for the mic
730 */
731 if (gspca_dev->audio &&
732 gspca_dev->dev->speed == USB_SPEED_FULL &&
733 last_bw >= 1000000 &&
734 i > 1) {
735 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
736 i--;
737 ep_tb--;
738 }
739
740 /* get the requested bandwidth and start at the highest atlsetting */
741 bandwidth = which_bandwidth(gspca_dev);
742 ep_tb--;
743 while (i > 1) {
744 ep_tb--;
745 if (ep_tb->bandwidth < bandwidth)
746 break;
747 i--;
748 }
749 return i;
750 }
751
752 /*
753 * create the URBs for image transfer
754 */
755 static int create_urbs(struct gspca_dev *gspca_dev,
756 struct usb_host_endpoint *ep)
757 {
758 struct urb *urb;
759 int n, nurbs, i, psize, npkt, bsize;
760
761 /* calculate the packet size and the number of packets */
762 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
763
764 if (!gspca_dev->cam.bulk) { /* isoc */
765
766 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
767 if (gspca_dev->pkt_size == 0)
768 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
769 else
770 psize = gspca_dev->pkt_size;
771 npkt = gspca_dev->cam.npkt;
772 if (npkt == 0)
773 npkt = 32; /* default value */
774 bsize = psize * npkt;
775 PDEBUG(D_STREAM,
776 "isoc %d pkts size %d = bsize:%d",
777 npkt, psize, bsize);
778 nurbs = DEF_NURBS;
779 } else { /* bulk */
780 npkt = 0;
781 bsize = gspca_dev->cam.bulk_size;
782 if (bsize == 0)
783 bsize = psize;
784 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
785 if (gspca_dev->cam.bulk_nurbs != 0)
786 nurbs = gspca_dev->cam.bulk_nurbs;
787 else
788 nurbs = 1;
789 }
790
791 for (n = 0; n < nurbs; n++) {
792 urb = usb_alloc_urb(npkt, GFP_KERNEL);
793 if (!urb)
794 return -ENOMEM;
795 gspca_dev->urb[n] = urb;
796 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
797 bsize,
798 GFP_KERNEL,
799 &urb->transfer_dma);
800
801 if (urb->transfer_buffer == NULL) {
802 pr_err("usb_alloc_coherent failed\n");
803 return -ENOMEM;
804 }
805 urb->dev = gspca_dev->dev;
806 urb->context = gspca_dev;
807 urb->transfer_buffer_length = bsize;
808 if (npkt != 0) { /* ISOC */
809 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
810 ep->desc.bEndpointAddress);
811 urb->transfer_flags = URB_ISO_ASAP
812 | URB_NO_TRANSFER_DMA_MAP;
813 urb->interval = 1 << (ep->desc.bInterval - 1);
814 urb->complete = isoc_irq;
815 urb->number_of_packets = npkt;
816 for (i = 0; i < npkt; i++) {
817 urb->iso_frame_desc[i].length = psize;
818 urb->iso_frame_desc[i].offset = psize * i;
819 }
820 } else { /* bulk */
821 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
822 ep->desc.bEndpointAddress);
823 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
824 urb->complete = bulk_irq;
825 }
826 }
827 return 0;
828 }
829
830 /*
831 * start the USB transfer
832 */
833 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
834 {
835 struct usb_interface *intf;
836 struct usb_host_endpoint *ep;
837 struct urb *urb;
838 struct ep_tb_s ep_tb[MAX_ALT];
839 int n, ret, xfer, alt, alt_idx;
840
841 /* reset the streaming variables */
842 gspca_dev->image = NULL;
843 gspca_dev->image_len = 0;
844 gspca_dev->last_packet_type = DISCARD_PACKET;
845 gspca_dev->sequence = 0;
846
847 gspca_dev->usb_err = 0;
848
849 /* do the specific subdriver stuff before endpoint selection */
850 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
851 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
852 if (gspca_dev->sd_desc->isoc_init) {
853 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
854 if (ret < 0)
855 return ret;
856 }
857 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
858 : USB_ENDPOINT_XFER_ISOC;
859
860 /* if bulk or the subdriver forced an altsetting, get the endpoint */
861 if (gspca_dev->alt != 0) {
862 gspca_dev->alt--; /* (previous version compatibility) */
863 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
864 gspca_dev->xfer_ep);
865 if (ep == NULL) {
866 pr_err("bad altsetting %d\n", gspca_dev->alt);
867 return -EIO;
868 }
869 ep_tb[0].alt = gspca_dev->alt;
870 alt_idx = 1;
871 } else {
872 /* else, compute the minimum bandwidth
873 * and build the endpoint table */
874 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
875 if (alt_idx <= 0) {
876 pr_err("no transfer endpoint found\n");
877 return -EIO;
878 }
879 }
880
881 /* set the highest alternate setting and
882 * loop until urb submit succeeds */
883 gspca_input_destroy_urb(gspca_dev);
884
885 gspca_dev->alt = ep_tb[--alt_idx].alt;
886 alt = -1;
887 for (;;) {
888 if (alt != gspca_dev->alt) {
889 alt = gspca_dev->alt;
890 if (intf->num_altsetting > 1) {
891 ret = usb_set_interface(gspca_dev->dev,
892 gspca_dev->iface,
893 alt);
894 if (ret < 0) {
895 if (ret == -ENOSPC)
896 goto retry; /*fixme: ugly*/
897 pr_err("set alt %d err %d\n", alt, ret);
898 goto out;
899 }
900 }
901 }
902 if (!gspca_dev->cam.no_urb_create) {
903 PDEBUG(D_STREAM, "init transfer alt %d", alt);
904 ret = create_urbs(gspca_dev,
905 alt_xfer(&intf->altsetting[alt], xfer,
906 gspca_dev->xfer_ep));
907 if (ret < 0) {
908 destroy_urbs(gspca_dev);
909 goto out;
910 }
911 }
912
913 /* clear the bulk endpoint */
914 if (gspca_dev->cam.bulk)
915 usb_clear_halt(gspca_dev->dev,
916 gspca_dev->urb[0]->pipe);
917
918 /* start the cam */
919 ret = gspca_dev->sd_desc->start(gspca_dev);
920 if (ret < 0) {
921 destroy_urbs(gspca_dev);
922 goto out;
923 }
924 gspca_dev->streaming = 1;
925 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
926
927 /* some bulk transfers are started by the subdriver */
928 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
929 break;
930
931 /* submit the URBs */
932 for (n = 0; n < MAX_NURBS; n++) {
933 urb = gspca_dev->urb[n];
934 if (urb == NULL)
935 break;
936 ret = usb_submit_urb(urb, GFP_KERNEL);
937 if (ret < 0)
938 break;
939 }
940 if (ret >= 0)
941 break; /* transfer is started */
942
943 /* something when wrong
944 * stop the webcam and free the transfer resources */
945 gspca_stream_off(gspca_dev);
946 if (ret != -ENOSPC) {
947 pr_err("usb_submit_urb alt %d err %d\n",
948 gspca_dev->alt, ret);
949 goto out;
950 }
951
952 /* the bandwidth is not wide enough
953 * negotiate or try a lower alternate setting */
954 retry:
955 PERR("alt %d - bandwidth not wide enough, trying again", alt);
956 msleep(20); /* wait for kill complete */
957 if (gspca_dev->sd_desc->isoc_nego) {
958 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
959 if (ret < 0)
960 goto out;
961 } else {
962 if (alt_idx <= 0) {
963 pr_err("no transfer endpoint found\n");
964 ret = -EIO;
965 goto out;
966 }
967 gspca_dev->alt = ep_tb[--alt_idx].alt;
968 }
969 }
970 out:
971 gspca_input_create_urb(gspca_dev);
972 return ret;
973 }
974
975 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
976 {
977 int i;
978
979 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
980 gspca_dev->curr_mode = i;
981 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
982
983 /* does nothing if ctrl_handler == NULL */
984 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
985 }
986
987 static int wxh_to_mode(struct gspca_dev *gspca_dev,
988 int width, int height)
989 {
990 int i;
991
992 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
993 if (width == gspca_dev->cam.cam_mode[i].width
994 && height == gspca_dev->cam.cam_mode[i].height)
995 return i;
996 }
997 return -EINVAL;
998 }
999
1000 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
1001 int width, int height)
1002 {
1003 int i;
1004
1005 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1006 if (width >= gspca_dev->cam.cam_mode[i].width
1007 && height >= gspca_dev->cam.cam_mode[i].height)
1008 break;
1009 }
1010 return i;
1011 }
1012
1013 /*
1014 * search a mode with the right pixel format
1015 */
1016 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1017 int mode,
1018 int pixfmt)
1019 {
1020 int modeU, modeD;
1021
1022 modeU = modeD = mode;
1023 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1024 if (--modeD >= 0) {
1025 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1026 == pixfmt)
1027 return modeD;
1028 }
1029 if (++modeU < gspca_dev->cam.nmodes) {
1030 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1031 == pixfmt)
1032 return modeU;
1033 }
1034 }
1035 return -EINVAL;
1036 }
1037
1038 #ifdef CONFIG_VIDEO_ADV_DEBUG
1039 static int vidioc_g_chip_info(struct file *file, void *priv,
1040 struct v4l2_dbg_chip_info *chip)
1041 {
1042 struct gspca_dev *gspca_dev = video_drvdata(file);
1043
1044 gspca_dev->usb_err = 0;
1045 if (gspca_dev->sd_desc->get_chip_info)
1046 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1047 return chip->match.addr ? -EINVAL : 0;
1048 }
1049
1050 static int vidioc_g_register(struct file *file, void *priv,
1051 struct v4l2_dbg_register *reg)
1052 {
1053 struct gspca_dev *gspca_dev = video_drvdata(file);
1054
1055 gspca_dev->usb_err = 0;
1056 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1057 }
1058
1059 static int vidioc_s_register(struct file *file, void *priv,
1060 const struct v4l2_dbg_register *reg)
1061 {
1062 struct gspca_dev *gspca_dev = video_drvdata(file);
1063
1064 gspca_dev->usb_err = 0;
1065 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1066 }
1067 #endif
1068
1069 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1070 struct v4l2_fmtdesc *fmtdesc)
1071 {
1072 struct gspca_dev *gspca_dev = video_drvdata(file);
1073 int i, j, index;
1074 __u32 fmt_tb[8];
1075
1076 /* give an index to each format */
1077 index = 0;
1078 j = 0;
1079 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1080 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1081 j = 0;
1082 for (;;) {
1083 if (fmt_tb[j] == fmt_tb[index])
1084 break;
1085 j++;
1086 }
1087 if (j == index) {
1088 if (fmtdesc->index == index)
1089 break; /* new format */
1090 index++;
1091 if (index >= ARRAY_SIZE(fmt_tb))
1092 return -EINVAL;
1093 }
1094 }
1095 if (i < 0)
1096 return -EINVAL; /* no more format */
1097
1098 fmtdesc->pixelformat = fmt_tb[index];
1099 if (gspca_dev->cam.cam_mode[i].sizeimage <
1100 gspca_dev->cam.cam_mode[i].width *
1101 gspca_dev->cam.cam_mode[i].height)
1102 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1103 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1104 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1105 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1106 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1107 fmtdesc->description[4] = '\0';
1108 return 0;
1109 }
1110
1111 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1112 struct v4l2_format *fmt)
1113 {
1114 struct gspca_dev *gspca_dev = video_drvdata(file);
1115
1116 fmt->fmt.pix = gspca_dev->pixfmt;
1117 /* some drivers use priv internally, zero it before giving it back to
1118 the core */
1119 fmt->fmt.pix.priv = 0;
1120 return 0;
1121 }
1122
1123 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1124 struct v4l2_format *fmt)
1125 {
1126 int w, h, mode, mode2;
1127
1128 w = fmt->fmt.pix.width;
1129 h = fmt->fmt.pix.height;
1130
1131 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1132 fmt->fmt.pix.pixelformat, w, h);
1133
1134 /* search the nearest mode for width and height */
1135 mode = wxh_to_nearest_mode(gspca_dev, w, h);
1136
1137 /* OK if right palette */
1138 if (gspca_dev->cam.cam_mode[mode].pixelformat
1139 != fmt->fmt.pix.pixelformat) {
1140
1141 /* else, search the closest mode with the same pixel format */
1142 mode2 = gspca_get_mode(gspca_dev, mode,
1143 fmt->fmt.pix.pixelformat);
1144 if (mode2 >= 0)
1145 mode = mode2;
1146 }
1147 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1148 if (gspca_dev->sd_desc->try_fmt) {
1149 /* pass original resolution to subdriver try_fmt */
1150 fmt->fmt.pix.width = w;
1151 fmt->fmt.pix.height = h;
1152 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1153 }
1154 /* some drivers use priv internally, zero it before giving it back to
1155 the core */
1156 fmt->fmt.pix.priv = 0;
1157 return mode; /* used when s_fmt */
1158 }
1159
1160 static int vidioc_try_fmt_vid_cap(struct file *file,
1161 void *priv,
1162 struct v4l2_format *fmt)
1163 {
1164 struct gspca_dev *gspca_dev = video_drvdata(file);
1165 int ret;
1166
1167 ret = try_fmt_vid_cap(gspca_dev, fmt);
1168 if (ret < 0)
1169 return ret;
1170 return 0;
1171 }
1172
1173 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1174 struct v4l2_format *fmt)
1175 {
1176 struct gspca_dev *gspca_dev = video_drvdata(file);
1177 int ret;
1178
1179 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1180 return -ERESTARTSYS;
1181
1182 ret = try_fmt_vid_cap(gspca_dev, fmt);
1183 if (ret < 0)
1184 goto out;
1185
1186 if (gspca_dev->nframes != 0
1187 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1188 ret = -EINVAL;
1189 goto out;
1190 }
1191
1192 if (gspca_dev->streaming) {
1193 ret = -EBUSY;
1194 goto out;
1195 }
1196 gspca_dev->curr_mode = ret;
1197 if (gspca_dev->sd_desc->try_fmt)
1198 /* subdriver try_fmt can modify format parameters */
1199 gspca_dev->pixfmt = fmt->fmt.pix;
1200 else
1201 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1202
1203 ret = 0;
1204 out:
1205 mutex_unlock(&gspca_dev->queue_lock);
1206 return ret;
1207 }
1208
1209 static int vidioc_enum_framesizes(struct file *file, void *priv,
1210 struct v4l2_frmsizeenum *fsize)
1211 {
1212 struct gspca_dev *gspca_dev = video_drvdata(file);
1213 int i;
1214 __u32 index = 0;
1215
1216 if (gspca_dev->sd_desc->enum_framesizes)
1217 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1218
1219 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1220 if (fsize->pixel_format !=
1221 gspca_dev->cam.cam_mode[i].pixelformat)
1222 continue;
1223
1224 if (fsize->index == index) {
1225 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1226 fsize->discrete.width =
1227 gspca_dev->cam.cam_mode[i].width;
1228 fsize->discrete.height =
1229 gspca_dev->cam.cam_mode[i].height;
1230 return 0;
1231 }
1232 index++;
1233 }
1234
1235 return -EINVAL;
1236 }
1237
1238 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1239 struct v4l2_frmivalenum *fival)
1240 {
1241 struct gspca_dev *gspca_dev = video_drvdata(filp);
1242 int mode;
1243 __u32 i;
1244
1245 mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1246 if (mode < 0)
1247 return -EINVAL;
1248
1249 if (gspca_dev->cam.mode_framerates == NULL ||
1250 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1251 return -EINVAL;
1252
1253 if (fival->pixel_format !=
1254 gspca_dev->cam.cam_mode[mode].pixelformat)
1255 return -EINVAL;
1256
1257 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1258 if (fival->index == i) {
1259 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1260 fival->discrete.numerator = 1;
1261 fival->discrete.denominator =
1262 gspca_dev->cam.mode_framerates[mode].rates[i];
1263 return 0;
1264 }
1265 }
1266
1267 return -EINVAL;
1268 }
1269
1270 static void gspca_release(struct v4l2_device *v4l2_device)
1271 {
1272 struct gspca_dev *gspca_dev =
1273 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1274
1275 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1276 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1277 kfree(gspca_dev->usb_buf);
1278 kfree(gspca_dev);
1279 }
1280
1281 static int dev_open(struct file *file)
1282 {
1283 struct gspca_dev *gspca_dev = video_drvdata(file);
1284 int ret;
1285
1286 PDEBUG(D_STREAM, "[%s] open", current->comm);
1287
1288 /* protect the subdriver against rmmod */
1289 if (!try_module_get(gspca_dev->module))
1290 return -ENODEV;
1291
1292 ret = v4l2_fh_open(file);
1293 if (ret)
1294 module_put(gspca_dev->module);
1295 return ret;
1296 }
1297
1298 static int dev_close(struct file *file)
1299 {
1300 struct gspca_dev *gspca_dev = video_drvdata(file);
1301
1302 PDEBUG(D_STREAM, "[%s] close", current->comm);
1303
1304 /* Needed for gspca_stream_off, always lock before queue_lock! */
1305 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1306 return -ERESTARTSYS;
1307
1308 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1309 mutex_unlock(&gspca_dev->usb_lock);
1310 return -ERESTARTSYS;
1311 }
1312
1313 /* if the file did the capture, free the streaming resources */
1314 if (gspca_dev->capt_file == file) {
1315 if (gspca_dev->streaming)
1316 gspca_stream_off(gspca_dev);
1317 frame_free(gspca_dev);
1318 }
1319 module_put(gspca_dev->module);
1320 mutex_unlock(&gspca_dev->queue_lock);
1321 mutex_unlock(&gspca_dev->usb_lock);
1322
1323 PDEBUG(D_STREAM, "close done");
1324
1325 return v4l2_fh_release(file);
1326 }
1327
1328 static int vidioc_querycap(struct file *file, void *priv,
1329 struct v4l2_capability *cap)
1330 {
1331 struct gspca_dev *gspca_dev = video_drvdata(file);
1332
1333 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1334 sizeof cap->driver);
1335 if (gspca_dev->dev->product != NULL) {
1336 strlcpy((char *) cap->card, gspca_dev->dev->product,
1337 sizeof cap->card);
1338 } else {
1339 snprintf((char *) cap->card, sizeof cap->card,
1340 "USB Camera (%04x:%04x)",
1341 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1342 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1343 }
1344 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1345 sizeof(cap->bus_info));
1346 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1347 | V4L2_CAP_STREAMING
1348 | V4L2_CAP_READWRITE;
1349 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1350 return 0;
1351 }
1352
1353 static int vidioc_enum_input(struct file *file, void *priv,
1354 struct v4l2_input *input)
1355 {
1356 struct gspca_dev *gspca_dev = video_drvdata(file);
1357
1358 if (input->index != 0)
1359 return -EINVAL;
1360 input->type = V4L2_INPUT_TYPE_CAMERA;
1361 input->status = gspca_dev->cam.input_flags;
1362 strlcpy(input->name, gspca_dev->sd_desc->name,
1363 sizeof input->name);
1364 return 0;
1365 }
1366
1367 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1368 {
1369 *i = 0;
1370 return 0;
1371 }
1372
1373 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1374 {
1375 if (i > 0)
1376 return -EINVAL;
1377 return (0);
1378 }
1379
1380 static int vidioc_reqbufs(struct file *file, void *priv,
1381 struct v4l2_requestbuffers *rb)
1382 {
1383 struct gspca_dev *gspca_dev = video_drvdata(file);
1384 int i, ret = 0, streaming;
1385
1386 i = rb->memory; /* (avoid compilation warning) */
1387 switch (i) {
1388 case GSPCA_MEMORY_READ: /* (internal call) */
1389 case V4L2_MEMORY_MMAP:
1390 case V4L2_MEMORY_USERPTR:
1391 break;
1392 default:
1393 return -EINVAL;
1394 }
1395 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1396 return -ERESTARTSYS;
1397
1398 if (gspca_dev->memory != GSPCA_MEMORY_NO
1399 && gspca_dev->memory != GSPCA_MEMORY_READ
1400 && gspca_dev->memory != rb->memory) {
1401 ret = -EBUSY;
1402 goto out;
1403 }
1404
1405 /* only one file may do the capture */
1406 if (gspca_dev->capt_file != NULL
1407 && gspca_dev->capt_file != file) {
1408 ret = -EBUSY;
1409 goto out;
1410 }
1411
1412 /* if allocated, the buffers must not be mapped */
1413 for (i = 0; i < gspca_dev->nframes; i++) {
1414 if (gspca_dev->frame[i].vma_use_count) {
1415 ret = -EBUSY;
1416 goto out;
1417 }
1418 }
1419
1420 /* stop streaming */
1421 streaming = gspca_dev->streaming;
1422 if (streaming) {
1423 gspca_stream_off(gspca_dev);
1424
1425 /* Don't restart the stream when switching from read
1426 * to mmap mode */
1427 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1428 streaming = 0;
1429 }
1430
1431 /* free the previous allocated buffers, if any */
1432 if (gspca_dev->nframes != 0)
1433 frame_free(gspca_dev);
1434 if (rb->count == 0) /* unrequest */
1435 goto out;
1436 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1437 if (ret == 0) {
1438 rb->count = gspca_dev->nframes;
1439 if (streaming)
1440 ret = gspca_init_transfer(gspca_dev);
1441 }
1442 out:
1443 mutex_unlock(&gspca_dev->queue_lock);
1444 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1445 return ret;
1446 }
1447
1448 static int vidioc_querybuf(struct file *file, void *priv,
1449 struct v4l2_buffer *v4l2_buf)
1450 {
1451 struct gspca_dev *gspca_dev = video_drvdata(file);
1452 struct gspca_frame *frame;
1453
1454 if (v4l2_buf->index >= gspca_dev->nframes)
1455 return -EINVAL;
1456
1457 frame = &gspca_dev->frame[v4l2_buf->index];
1458 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1459 return 0;
1460 }
1461
1462 static int vidioc_streamon(struct file *file, void *priv,
1463 enum v4l2_buf_type buf_type)
1464 {
1465 struct gspca_dev *gspca_dev = video_drvdata(file);
1466 int ret;
1467
1468 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1469 return -EINVAL;
1470 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1471 return -ERESTARTSYS;
1472
1473 /* check the capture file */
1474 if (gspca_dev->capt_file != file) {
1475 ret = -EBUSY;
1476 goto out;
1477 }
1478
1479 if (gspca_dev->nframes == 0
1480 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1481 ret = -EINVAL;
1482 goto out;
1483 }
1484 if (!gspca_dev->streaming) {
1485 ret = gspca_init_transfer(gspca_dev);
1486 if (ret < 0)
1487 goto out;
1488 }
1489 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1490 gspca_dev->pixfmt.pixelformat,
1491 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1492 ret = 0;
1493 out:
1494 mutex_unlock(&gspca_dev->queue_lock);
1495 return ret;
1496 }
1497
1498 static int vidioc_streamoff(struct file *file, void *priv,
1499 enum v4l2_buf_type buf_type)
1500 {
1501 struct gspca_dev *gspca_dev = video_drvdata(file);
1502 int i, ret;
1503
1504 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1505 return -EINVAL;
1506
1507 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1508 return -ERESTARTSYS;
1509
1510 if (!gspca_dev->streaming) {
1511 ret = 0;
1512 goto out;
1513 }
1514
1515 /* check the capture file */
1516 if (gspca_dev->capt_file != file) {
1517 ret = -EBUSY;
1518 goto out;
1519 }
1520
1521 /* stop streaming */
1522 gspca_stream_off(gspca_dev);
1523 /* In case another thread is waiting in dqbuf */
1524 wake_up_interruptible(&gspca_dev->wq);
1525
1526 /* empty the transfer queues */
1527 for (i = 0; i < gspca_dev->nframes; i++)
1528 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1529 atomic_set(&gspca_dev->fr_q, 0);
1530 atomic_set(&gspca_dev->fr_i, 0);
1531 gspca_dev->fr_o = 0;
1532 ret = 0;
1533 out:
1534 mutex_unlock(&gspca_dev->queue_lock);
1535 return ret;
1536 }
1537
1538 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1539 struct v4l2_jpegcompression *jpegcomp)
1540 {
1541 struct gspca_dev *gspca_dev = video_drvdata(file);
1542
1543 gspca_dev->usb_err = 0;
1544 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1545 }
1546
1547 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1548 const struct v4l2_jpegcompression *jpegcomp)
1549 {
1550 struct gspca_dev *gspca_dev = video_drvdata(file);
1551
1552 gspca_dev->usb_err = 0;
1553 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1554 }
1555
1556 static int vidioc_g_parm(struct file *filp, void *priv,
1557 struct v4l2_streamparm *parm)
1558 {
1559 struct gspca_dev *gspca_dev = video_drvdata(filp);
1560
1561 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1562
1563 if (gspca_dev->sd_desc->get_streamparm) {
1564 gspca_dev->usb_err = 0;
1565 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1566 return gspca_dev->usb_err;
1567 }
1568 return 0;
1569 }
1570
1571 static int vidioc_s_parm(struct file *filp, void *priv,
1572 struct v4l2_streamparm *parm)
1573 {
1574 struct gspca_dev *gspca_dev = video_drvdata(filp);
1575 unsigned int n;
1576
1577 n = parm->parm.capture.readbuffers;
1578 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1579 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1580 else
1581 gspca_dev->nbufread = n;
1582
1583 if (gspca_dev->sd_desc->set_streamparm) {
1584 gspca_dev->usb_err = 0;
1585 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1586 return gspca_dev->usb_err;
1587 }
1588
1589 return 0;
1590 }
1591
1592 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1593 {
1594 struct gspca_dev *gspca_dev = video_drvdata(file);
1595 struct gspca_frame *frame;
1596 struct page *page;
1597 unsigned long addr, start, size;
1598 int i, ret;
1599
1600 start = vma->vm_start;
1601 size = vma->vm_end - vma->vm_start;
1602 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1603
1604 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1605 return -ERESTARTSYS;
1606 if (gspca_dev->capt_file != file) {
1607 ret = -EINVAL;
1608 goto out;
1609 }
1610
1611 frame = NULL;
1612 for (i = 0; i < gspca_dev->nframes; ++i) {
1613 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1614 PDEBUG(D_STREAM, "mmap bad memory type");
1615 break;
1616 }
1617 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1618 == vma->vm_pgoff) {
1619 frame = &gspca_dev->frame[i];
1620 break;
1621 }
1622 }
1623 if (frame == NULL) {
1624 PDEBUG(D_STREAM, "mmap no frame buffer found");
1625 ret = -EINVAL;
1626 goto out;
1627 }
1628 if (size != frame->v4l2_buf.length) {
1629 PDEBUG(D_STREAM, "mmap bad size");
1630 ret = -EINVAL;
1631 goto out;
1632 }
1633
1634 /*
1635 * - VM_IO marks the area as being a mmaped region for I/O to a
1636 * device. It also prevents the region from being core dumped.
1637 */
1638 vma->vm_flags |= VM_IO;
1639
1640 addr = (unsigned long) frame->data;
1641 while (size > 0) {
1642 page = vmalloc_to_page((void *) addr);
1643 ret = vm_insert_page(vma, start, page);
1644 if (ret < 0)
1645 goto out;
1646 start += PAGE_SIZE;
1647 addr += PAGE_SIZE;
1648 size -= PAGE_SIZE;
1649 }
1650
1651 vma->vm_ops = &gspca_vm_ops;
1652 vma->vm_private_data = frame;
1653 gspca_vm_open(vma);
1654 ret = 0;
1655 out:
1656 mutex_unlock(&gspca_dev->queue_lock);
1657 return ret;
1658 }
1659
1660 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1661 enum v4l2_memory memory)
1662 {
1663 if (!gspca_dev->present)
1664 return -ENODEV;
1665 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1666 !gspca_dev->streaming)
1667 return -EINVAL;
1668
1669 /* check if a frame is ready */
1670 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1671 }
1672
1673 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1674 enum v4l2_memory memory)
1675 {
1676 int ret;
1677
1678 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1679 return -ERESTARTSYS;
1680 ret = frame_ready_nolock(gspca_dev, file, memory);
1681 mutex_unlock(&gspca_dev->queue_lock);
1682 return ret;
1683 }
1684
1685 /*
1686 * dequeue a video buffer
1687 *
1688 * If nonblock_ing is false, block until a buffer is available.
1689 */
1690 static int vidioc_dqbuf(struct file *file, void *priv,
1691 struct v4l2_buffer *v4l2_buf)
1692 {
1693 struct gspca_dev *gspca_dev = video_drvdata(file);
1694 struct gspca_frame *frame;
1695 int i, j, ret;
1696
1697 PDEBUG(D_FRAM, "dqbuf");
1698
1699 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1700 return -ERESTARTSYS;
1701
1702 for (;;) {
1703 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1704 if (ret < 0)
1705 goto out;
1706 if (ret > 0)
1707 break;
1708
1709 mutex_unlock(&gspca_dev->queue_lock);
1710
1711 if (file->f_flags & O_NONBLOCK)
1712 return -EAGAIN;
1713
1714 /* wait till a frame is ready */
1715 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1716 frame_ready(gspca_dev, file, v4l2_buf->memory),
1717 msecs_to_jiffies(3000));
1718 if (ret < 0)
1719 return ret;
1720 if (ret == 0)
1721 return -EIO;
1722
1723 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1724 return -ERESTARTSYS;
1725 }
1726
1727 i = gspca_dev->fr_o;
1728 j = gspca_dev->fr_queue[i];
1729 frame = &gspca_dev->frame[j];
1730
1731 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1732
1733 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1734 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1735 PDEBUG(D_FRAM, "dqbuf %d", j);
1736 ret = 0;
1737
1738 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1739 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1740 frame->data,
1741 frame->v4l2_buf.bytesused)) {
1742 PERR("dqbuf cp to user failed");
1743 ret = -EFAULT;
1744 }
1745 }
1746 out:
1747 mutex_unlock(&gspca_dev->queue_lock);
1748
1749 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1750 mutex_lock(&gspca_dev->usb_lock);
1751 gspca_dev->usb_err = 0;
1752 if (gspca_dev->present)
1753 gspca_dev->sd_desc->dq_callback(gspca_dev);
1754 mutex_unlock(&gspca_dev->usb_lock);
1755 }
1756
1757 return ret;
1758 }
1759
1760 /*
1761 * queue a video buffer
1762 *
1763 * Attempting to queue a buffer that has already been
1764 * queued will return -EINVAL.
1765 */
1766 static int vidioc_qbuf(struct file *file, void *priv,
1767 struct v4l2_buffer *v4l2_buf)
1768 {
1769 struct gspca_dev *gspca_dev = video_drvdata(file);
1770 struct gspca_frame *frame;
1771 int i, index, ret;
1772
1773 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1774
1775 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1776 return -ERESTARTSYS;
1777
1778 index = v4l2_buf->index;
1779 if ((unsigned) index >= gspca_dev->nframes) {
1780 PDEBUG(D_FRAM,
1781 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1782 ret = -EINVAL;
1783 goto out;
1784 }
1785 if (v4l2_buf->memory != gspca_dev->memory) {
1786 PDEBUG(D_FRAM, "qbuf bad memory type");
1787 ret = -EINVAL;
1788 goto out;
1789 }
1790
1791 frame = &gspca_dev->frame[index];
1792 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1793 PDEBUG(D_FRAM, "qbuf bad state");
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1799
1800 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1801 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1802 frame->v4l2_buf.length = v4l2_buf->length;
1803 }
1804
1805 /* put the buffer in the 'queued' queue */
1806 i = atomic_read(&gspca_dev->fr_q);
1807 gspca_dev->fr_queue[i] = index;
1808 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1809
1810 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1811 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1812 ret = 0;
1813 out:
1814 mutex_unlock(&gspca_dev->queue_lock);
1815 return ret;
1816 }
1817
1818 /*
1819 * allocate the resources for read()
1820 */
1821 static int read_alloc(struct gspca_dev *gspca_dev,
1822 struct file *file)
1823 {
1824 struct v4l2_buffer v4l2_buf;
1825 int i, ret;
1826
1827 PDEBUG(D_STREAM, "read alloc");
1828
1829 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1830 return -ERESTARTSYS;
1831
1832 if (gspca_dev->nframes == 0) {
1833 struct v4l2_requestbuffers rb;
1834
1835 memset(&rb, 0, sizeof rb);
1836 rb.count = gspca_dev->nbufread;
1837 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1838 rb.memory = GSPCA_MEMORY_READ;
1839 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1840 if (ret != 0) {
1841 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1842 goto out;
1843 }
1844 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1845 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1846 v4l2_buf.memory = GSPCA_MEMORY_READ;
1847 for (i = 0; i < gspca_dev->nbufread; i++) {
1848 v4l2_buf.index = i;
1849 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1850 if (ret != 0) {
1851 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1852 goto out;
1853 }
1854 }
1855 }
1856
1857 /* start streaming */
1858 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1859 if (ret != 0)
1860 PDEBUG(D_STREAM, "read streamon err %d", ret);
1861 out:
1862 mutex_unlock(&gspca_dev->usb_lock);
1863 return ret;
1864 }
1865
1866 static unsigned int dev_poll(struct file *file, poll_table *wait)
1867 {
1868 struct gspca_dev *gspca_dev = video_drvdata(file);
1869 unsigned long req_events = poll_requested_events(wait);
1870 int ret = 0;
1871
1872 PDEBUG(D_FRAM, "poll");
1873
1874 if (req_events & POLLPRI)
1875 ret |= v4l2_ctrl_poll(file, wait);
1876
1877 if (req_events & (POLLIN | POLLRDNORM)) {
1878 /* if reqbufs is not done, the user would use read() */
1879 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1880 if (read_alloc(gspca_dev, file) != 0) {
1881 ret |= POLLERR;
1882 goto out;
1883 }
1884 }
1885
1886 poll_wait(file, &gspca_dev->wq, wait);
1887
1888 /* check if an image has been received */
1889 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1890 ret |= POLLERR;
1891 goto out;
1892 }
1893 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1894 ret |= POLLIN | POLLRDNORM;
1895 mutex_unlock(&gspca_dev->queue_lock);
1896 }
1897
1898 out:
1899 if (!gspca_dev->present)
1900 ret |= POLLHUP;
1901
1902 return ret;
1903 }
1904
1905 static ssize_t dev_read(struct file *file, char __user *data,
1906 size_t count, loff_t *ppos)
1907 {
1908 struct gspca_dev *gspca_dev = video_drvdata(file);
1909 struct gspca_frame *frame;
1910 struct v4l2_buffer v4l2_buf;
1911 struct timeval timestamp;
1912 int n, ret, ret2;
1913
1914 PDEBUG(D_FRAM, "read (%zd)", count);
1915 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1916 ret = read_alloc(gspca_dev, file);
1917 if (ret != 0)
1918 return ret;
1919 }
1920
1921 /* get a frame */
1922 v4l2_get_timestamp(&timestamp);
1923 timestamp.tv_sec--;
1924 n = 2;
1925 for (;;) {
1926 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1927 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1928 v4l2_buf.memory = GSPCA_MEMORY_READ;
1929 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1930 if (ret != 0) {
1931 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1932 return ret;
1933 }
1934
1935 /* if the process slept for more than 1 second,
1936 * get a newer frame */
1937 frame = &gspca_dev->frame[v4l2_buf.index];
1938 if (--n < 0)
1939 break; /* avoid infinite loop */
1940 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1941 break;
1942 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1943 if (ret != 0) {
1944 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1945 return ret;
1946 }
1947 }
1948
1949 /* copy the frame */
1950 if (count > frame->v4l2_buf.bytesused)
1951 count = frame->v4l2_buf.bytesused;
1952 ret = copy_to_user(data, frame->data, count);
1953 if (ret != 0) {
1954 PERR("read cp to user lack %d / %zd", ret, count);
1955 ret = -EFAULT;
1956 goto out;
1957 }
1958 ret = count;
1959 out:
1960 /* in each case, requeue the buffer */
1961 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1962 if (ret2 != 0)
1963 return ret2;
1964 return ret;
1965 }
1966
1967 static const struct v4l2_file_operations dev_fops = {
1968 .owner = THIS_MODULE,
1969 .open = dev_open,
1970 .release = dev_close,
1971 .read = dev_read,
1972 .mmap = dev_mmap,
1973 .unlocked_ioctl = video_ioctl2,
1974 .poll = dev_poll,
1975 };
1976
1977 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1978 .vidioc_querycap = vidioc_querycap,
1979 .vidioc_dqbuf = vidioc_dqbuf,
1980 .vidioc_qbuf = vidioc_qbuf,
1981 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1982 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1983 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1984 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1985 .vidioc_streamon = vidioc_streamon,
1986 .vidioc_enum_input = vidioc_enum_input,
1987 .vidioc_g_input = vidioc_g_input,
1988 .vidioc_s_input = vidioc_s_input,
1989 .vidioc_reqbufs = vidioc_reqbufs,
1990 .vidioc_querybuf = vidioc_querybuf,
1991 .vidioc_streamoff = vidioc_streamoff,
1992 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1993 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1994 .vidioc_g_parm = vidioc_g_parm,
1995 .vidioc_s_parm = vidioc_s_parm,
1996 .vidioc_enum_framesizes = vidioc_enum_framesizes,
1997 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1998 #ifdef CONFIG_VIDEO_ADV_DEBUG
1999 .vidioc_g_chip_info = vidioc_g_chip_info,
2000 .vidioc_g_register = vidioc_g_register,
2001 .vidioc_s_register = vidioc_s_register,
2002 #endif
2003 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2004 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2005 };
2006
2007 static const struct video_device gspca_template = {
2008 .name = "gspca main driver",
2009 .fops = &dev_fops,
2010 .ioctl_ops = &dev_ioctl_ops,
2011 .release = video_device_release_empty, /* We use v4l2_dev.release */
2012 };
2013
2014 /*
2015 * probe and create a new gspca device
2016 *
2017 * This function must be called by the sub-driver when it is
2018 * called for probing a new device.
2019 */
2020 int gspca_dev_probe2(struct usb_interface *intf,
2021 const struct usb_device_id *id,
2022 const struct sd_desc *sd_desc,
2023 int dev_size,
2024 struct module *module)
2025 {
2026 struct gspca_dev *gspca_dev;
2027 struct usb_device *dev = interface_to_usbdev(intf);
2028 int ret;
2029
2030 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2031 sd_desc->name, id->idVendor, id->idProduct);
2032
2033 /* create the device */
2034 if (dev_size < sizeof *gspca_dev)
2035 dev_size = sizeof *gspca_dev;
2036 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2037 if (!gspca_dev) {
2038 pr_err("couldn't kzalloc gspca struct\n");
2039 return -ENOMEM;
2040 }
2041 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2042 if (!gspca_dev->usb_buf) {
2043 pr_err("out of memory\n");
2044 ret = -ENOMEM;
2045 goto out;
2046 }
2047 gspca_dev->dev = dev;
2048 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2049 gspca_dev->xfer_ep = -1;
2050
2051 /* check if any audio device */
2052 if (dev->actconfig->desc.bNumInterfaces != 1) {
2053 int i;
2054 struct usb_interface *intf2;
2055
2056 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2057 intf2 = dev->actconfig->interface[i];
2058 if (intf2 != NULL
2059 && intf2->altsetting != NULL
2060 && intf2->altsetting->desc.bInterfaceClass ==
2061 USB_CLASS_AUDIO) {
2062 gspca_dev->audio = 1;
2063 break;
2064 }
2065 }
2066 }
2067
2068 gspca_dev->v4l2_dev.release = gspca_release;
2069 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2070 if (ret)
2071 goto out;
2072 gspca_dev->sd_desc = sd_desc;
2073 gspca_dev->nbufread = 2;
2074 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2075 gspca_dev->vdev = gspca_template;
2076 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2077 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2078 gspca_dev->module = module;
2079 gspca_dev->present = 1;
2080
2081 mutex_init(&gspca_dev->usb_lock);
2082 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2083 mutex_init(&gspca_dev->queue_lock);
2084 init_waitqueue_head(&gspca_dev->wq);
2085
2086 /* configure the subdriver and initialize the USB device */
2087 ret = sd_desc->config(gspca_dev, id);
2088 if (ret < 0)
2089 goto out;
2090 ret = sd_desc->init(gspca_dev);
2091 if (ret < 0)
2092 goto out;
2093 if (sd_desc->init_controls)
2094 ret = sd_desc->init_controls(gspca_dev);
2095 if (ret < 0)
2096 goto out;
2097 gspca_set_default_mode(gspca_dev);
2098
2099 ret = gspca_input_connect(gspca_dev);
2100 if (ret)
2101 goto out;
2102
2103 /*
2104 * Don't take usb_lock for these ioctls. This improves latency if
2105 * usb_lock is taken for a long time, e.g. when changing a control
2106 * value, and a new frame is ready to be dequeued.
2107 */
2108 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2109 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2110 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2111 #ifdef CONFIG_VIDEO_ADV_DEBUG
2112 if (!gspca_dev->sd_desc->get_register)
2113 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2114 if (!gspca_dev->sd_desc->set_register)
2115 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2116 #endif
2117 if (!gspca_dev->sd_desc->get_jcomp)
2118 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2119 if (!gspca_dev->sd_desc->set_jcomp)
2120 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2121
2122 /* init video stuff */
2123 ret = video_register_device(&gspca_dev->vdev,
2124 VFL_TYPE_GRABBER,
2125 -1);
2126 if (ret < 0) {
2127 pr_err("video_register_device err %d\n", ret);
2128 goto out;
2129 }
2130
2131 usb_set_intfdata(intf, gspca_dev);
2132 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2133
2134 gspca_input_create_urb(gspca_dev);
2135
2136 return 0;
2137 out:
2138 #if IS_ENABLED(CONFIG_INPUT)
2139 if (gspca_dev->input_dev)
2140 input_unregister_device(gspca_dev->input_dev);
2141 #endif
2142 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2143 kfree(gspca_dev->usb_buf);
2144 kfree(gspca_dev);
2145 return ret;
2146 }
2147 EXPORT_SYMBOL(gspca_dev_probe2);
2148
2149 /* same function as the previous one, but check the interface */
2150 int gspca_dev_probe(struct usb_interface *intf,
2151 const struct usb_device_id *id,
2152 const struct sd_desc *sd_desc,
2153 int dev_size,
2154 struct module *module)
2155 {
2156 struct usb_device *dev = interface_to_usbdev(intf);
2157
2158 /* we don't handle multi-config cameras */
2159 if (dev->descriptor.bNumConfigurations != 1) {
2160 pr_err("%04x:%04x too many config\n",
2161 id->idVendor, id->idProduct);
2162 return -ENODEV;
2163 }
2164
2165 /* the USB video interface must be the first one */
2166 if (dev->actconfig->desc.bNumInterfaces != 1
2167 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2168 return -ENODEV;
2169
2170 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2171 }
2172 EXPORT_SYMBOL(gspca_dev_probe);
2173
2174 /*
2175 * USB disconnection
2176 *
2177 * This function must be called by the sub-driver
2178 * when the device disconnects, after the specific resources are freed.
2179 */
2180 void gspca_disconnect(struct usb_interface *intf)
2181 {
2182 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2183 #if IS_ENABLED(CONFIG_INPUT)
2184 struct input_dev *input_dev;
2185 #endif
2186
2187 PDEBUG(D_PROBE, "%s disconnect",
2188 video_device_node_name(&gspca_dev->vdev));
2189
2190 mutex_lock(&gspca_dev->usb_lock);
2191
2192 gspca_dev->present = 0;
2193 destroy_urbs(gspca_dev);
2194
2195 #if IS_ENABLED(CONFIG_INPUT)
2196 gspca_input_destroy_urb(gspca_dev);
2197 input_dev = gspca_dev->input_dev;
2198 if (input_dev) {
2199 gspca_dev->input_dev = NULL;
2200 input_unregister_device(input_dev);
2201 }
2202 #endif
2203 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2204 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2205 gspca_dev->sd_desc->stop0(gspca_dev);
2206 gspca_dev->streaming = 0;
2207 gspca_dev->dev = NULL;
2208 wake_up_interruptible(&gspca_dev->wq);
2209
2210 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2211 video_unregister_device(&gspca_dev->vdev);
2212
2213 mutex_unlock(&gspca_dev->usb_lock);
2214
2215 /* (this will call gspca_release() immediately or on last close) */
2216 v4l2_device_put(&gspca_dev->v4l2_dev);
2217 }
2218 EXPORT_SYMBOL(gspca_disconnect);
2219
2220 #ifdef CONFIG_PM
2221 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2222 {
2223 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2224
2225 gspca_input_destroy_urb(gspca_dev);
2226
2227 if (!gspca_dev->streaming)
2228 return 0;
2229
2230 mutex_lock(&gspca_dev->usb_lock);
2231 gspca_dev->frozen = 1; /* avoid urb error messages */
2232 gspca_dev->usb_err = 0;
2233 if (gspca_dev->sd_desc->stopN)
2234 gspca_dev->sd_desc->stopN(gspca_dev);
2235 destroy_urbs(gspca_dev);
2236 gspca_set_alt0(gspca_dev);
2237 if (gspca_dev->sd_desc->stop0)
2238 gspca_dev->sd_desc->stop0(gspca_dev);
2239 mutex_unlock(&gspca_dev->usb_lock);
2240
2241 return 0;
2242 }
2243 EXPORT_SYMBOL(gspca_suspend);
2244
2245 int gspca_resume(struct usb_interface *intf)
2246 {
2247 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2248 int streaming, ret = 0;
2249
2250 mutex_lock(&gspca_dev->usb_lock);
2251 gspca_dev->frozen = 0;
2252 gspca_dev->usb_err = 0;
2253 gspca_dev->sd_desc->init(gspca_dev);
2254 /*
2255 * Most subdrivers send all ctrl values on sd_start and thus
2256 * only write to the device registers on s_ctrl when streaming ->
2257 * Clear streaming to avoid setting all ctrls twice.
2258 */
2259 streaming = gspca_dev->streaming;
2260 gspca_dev->streaming = 0;
2261 if (streaming)
2262 ret = gspca_init_transfer(gspca_dev);
2263 else
2264 gspca_input_create_urb(gspca_dev);
2265 mutex_unlock(&gspca_dev->usb_lock);
2266
2267 return ret;
2268 }
2269 EXPORT_SYMBOL(gspca_resume);
2270 #endif
2271
2272 /* -- module insert / remove -- */
2273 static int __init gspca_init(void)
2274 {
2275 pr_info("v" GSPCA_VERSION " registered\n");
2276 return 0;
2277 }
2278 static void __exit gspca_exit(void)
2279 {
2280 }
2281
2282 module_init(gspca_init);
2283 module_exit(gspca_exit);
2284
2285 module_param_named(debug, gspca_debug, int, 0644);
2286 MODULE_PARM_DESC(debug,
2287 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
Linux with added FPC-III support