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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / media / usb / gspca / gspca.c
blobd29773b8f696d2751d435155969c13e03efbbedb
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 gspca_dbg(gspca_dev, debug, "%s %c%c%c%c %dx%d\n",
67 txt,
68 pixfmt & 0xff,
69 (pixfmt >> 8) & 0xff,
70 (pixfmt >> 16) & 0xff,
71 pixfmt >> 24,
72 w, h);
73 } else {
74 gspca_dbg(gspca_dev, debug, "%s 0x%08x %dx%d\n",
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 gspca_err(gspca_dev, "Unknown packet received\n");
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 gspca_err(gspca_dev, "URB error %i, resubmitting\n",
140 urb->status);
141 urb->status = 0;
142 ret = 0;
143 }
144
145 if (ret == 0) {
146 ret = usb_submit_urb(urb, GFP_ATOMIC);
147 if (ret < 0)
148 pr_err("Resubmit URB failed with error %i\n", ret);
149 }
150 }
151
152 static int gspca_input_connect(struct gspca_dev *dev)
153 {
154 struct input_dev *input_dev;
155 int err = 0;
156
157 dev->input_dev = NULL;
158 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
159 input_dev = input_allocate_device();
160 if (!input_dev)
161 return -ENOMEM;
162
163 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
164 strlcat(dev->phys, "/input0", sizeof(dev->phys));
165
166 input_dev->name = dev->sd_desc->name;
167 input_dev->phys = dev->phys;
168
169 usb_to_input_id(dev->dev, &input_dev->id);
170
171 input_dev->evbit[0] = BIT_MASK(EV_KEY);
172 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
173 input_dev->dev.parent = &dev->dev->dev;
174
175 err = input_register_device(input_dev);
176 if (err) {
177 pr_err("Input device registration failed with error %i\n",
178 err);
179 input_dev->dev.parent = NULL;
180 input_free_device(input_dev);
181 } else {
182 dev->input_dev = input_dev;
183 }
184 }
185
186 return err;
187 }
188
189 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
190 struct usb_endpoint_descriptor *ep)
191 {
192 unsigned int buffer_len;
193 int interval;
194 struct urb *urb;
195 struct usb_device *dev;
196 void *buffer = NULL;
197 int ret = -EINVAL;
198
199 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
200 interval = ep->bInterval;
201 gspca_dbg(gspca_dev, D_CONF, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u\n",
202 ep->bEndpointAddress, buffer_len, interval);
203
204 dev = gspca_dev->dev;
205
206 urb = usb_alloc_urb(0, GFP_KERNEL);
207 if (!urb) {
208 ret = -ENOMEM;
209 goto error;
210 }
211
212 buffer = usb_alloc_coherent(dev, buffer_len,
213 GFP_KERNEL, &urb->transfer_dma);
214 if (!buffer) {
215 ret = -ENOMEM;
216 goto error_buffer;
217 }
218 usb_fill_int_urb(urb, dev,
219 usb_rcvintpipe(dev, ep->bEndpointAddress),
220 buffer, buffer_len,
221 int_irq, (void *)gspca_dev, interval);
222 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
223 ret = usb_submit_urb(urb, GFP_KERNEL);
224 if (ret < 0) {
225 gspca_err(gspca_dev, "submit int URB failed with error %i\n",
226 ret);
227 goto error_submit;
228 }
229 gspca_dev->int_urb = urb;
230 return ret;
231
232 error_submit:
233 usb_free_coherent(dev,
234 urb->transfer_buffer_length,
235 urb->transfer_buffer,
236 urb->transfer_dma);
237 error_buffer:
238 usb_free_urb(urb);
239 error:
240 return ret;
241 }
242
243 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
244 {
245 struct usb_interface *intf;
246 struct usb_host_interface *intf_desc;
247 struct usb_endpoint_descriptor *ep;
248 int i;
249
250 if (gspca_dev->sd_desc->int_pkt_scan) {
251 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
252 intf_desc = intf->cur_altsetting;
253 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
254 ep = &intf_desc->endpoint[i].desc;
255 if (usb_endpoint_dir_in(ep) &&
256 usb_endpoint_xfer_int(ep)) {
257
258 alloc_and_submit_int_urb(gspca_dev, ep);
259 break;
260 }
261 }
262 }
263 }
264
265 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
266 {
267 struct urb *urb;
268
269 urb = gspca_dev->int_urb;
270 if (urb) {
271 gspca_dev->int_urb = NULL;
272 usb_kill_urb(urb);
273 usb_free_coherent(gspca_dev->dev,
274 urb->transfer_buffer_length,
275 urb->transfer_buffer,
276 urb->transfer_dma);
277 usb_free_urb(urb);
278 }
279 }
280 #else
281 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
282 {
283 }
284
285 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
286 {
287 }
288
289 static inline int gspca_input_connect(struct gspca_dev *dev)
290 {
291 return 0;
292 }
293 #endif
294
295 /*
296 * fill a video frame from an URB and resubmit
297 */
298 static void fill_frame(struct gspca_dev *gspca_dev,
299 struct urb *urb)
300 {
301 u8 *data; /* address of data in the iso message */
302 int i, len, st;
303 cam_pkt_op pkt_scan;
304
305 if (urb->status != 0) {
306 if (urb->status == -ESHUTDOWN)
307 return; /* disconnection */
308 #ifdef CONFIG_PM
309 if (gspca_dev->frozen)
310 return;
311 #endif
312 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
313 urb->status = 0;
314 goto resubmit;
315 }
316 pkt_scan = gspca_dev->sd_desc->pkt_scan;
317 for (i = 0; i < urb->number_of_packets; i++) {
318 len = urb->iso_frame_desc[i].actual_length;
319
320 /* check the packet status and length */
321 st = urb->iso_frame_desc[i].status;
322 if (st) {
323 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
324 i, len, st);
325 gspca_dev->last_packet_type = DISCARD_PACKET;
326 continue;
327 }
328 if (len == 0) {
329 if (gspca_dev->empty_packet == 0)
330 gspca_dev->empty_packet = 1;
331 continue;
332 }
333
334 /* let the packet be analyzed by the subdriver */
335 gspca_dbg(gspca_dev, D_PACK, "packet [%d] o:%d l:%d\n",
336 i, urb->iso_frame_desc[i].offset, len);
337 data = (u8 *) urb->transfer_buffer
338 + urb->iso_frame_desc[i].offset;
339 pkt_scan(gspca_dev, data, len);
340 }
341
342 resubmit:
343 /* resubmit the URB */
344 st = usb_submit_urb(urb, GFP_ATOMIC);
345 if (st < 0)
346 pr_err("usb_submit_urb() ret %d\n", st);
347 }
348
349 /*
350 * ISOC message interrupt from the USB device
351 *
352 * Analyse each packet and call the subdriver for copy to the frame buffer.
353 */
354 static void isoc_irq(struct urb *urb)
355 {
356 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
357
358 gspca_dbg(gspca_dev, D_PACK, "isoc irq\n");
359 if (!gspca_dev->streaming)
360 return;
361 fill_frame(gspca_dev, urb);
362 }
363
364 /*
365 * bulk message interrupt from the USB device
366 */
367 static void bulk_irq(struct urb *urb)
368 {
369 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
370 int st;
371
372 gspca_dbg(gspca_dev, D_PACK, "bulk irq\n");
373 if (!gspca_dev->streaming)
374 return;
375 switch (urb->status) {
376 case 0:
377 break;
378 case -ESHUTDOWN:
379 return; /* disconnection */
380 default:
381 #ifdef CONFIG_PM
382 if (gspca_dev->frozen)
383 return;
384 #endif
385 gspca_err(gspca_dev, "urb status: %d\n", urb->status);
386 urb->status = 0;
387 goto resubmit;
388 }
389
390 gspca_dbg(gspca_dev, D_PACK, "packet l:%d\n", urb->actual_length);
391 gspca_dev->sd_desc->pkt_scan(gspca_dev,
392 urb->transfer_buffer,
393 urb->actual_length);
394
395 resubmit:
396 /* resubmit the URB */
397 if (gspca_dev->cam.bulk_nurbs != 0) {
398 st = usb_submit_urb(urb, GFP_ATOMIC);
399 if (st < 0)
400 pr_err("usb_submit_urb() ret %d\n", st);
401 }
402 }
403
404 /*
405 * add data to the current frame
406 *
407 * This function is called by the subdrivers at interrupt level.
408 *
409 * To build a frame, these ones must add
410 * - one FIRST_PACKET
411 * - 0 or many INTER_PACKETs
412 * - one LAST_PACKET
413 * DISCARD_PACKET invalidates the whole frame.
414 */
415 void gspca_frame_add(struct gspca_dev *gspca_dev,
416 enum gspca_packet_type packet_type,
417 const u8 *data,
418 int len)
419 {
420 struct gspca_frame *frame;
421 int i, j;
422
423 gspca_dbg(gspca_dev, D_PACK, "add t:%d l:%d\n", packet_type, len);
424
425 if (packet_type == FIRST_PACKET) {
426 i = atomic_read(&gspca_dev->fr_i);
427
428 /* if there are no queued buffer, discard the whole frame */
429 if (i == atomic_read(&gspca_dev->fr_q)) {
430 gspca_dev->last_packet_type = DISCARD_PACKET;
431 gspca_dev->sequence++;
432 return;
433 }
434 j = gspca_dev->fr_queue[i];
435 frame = &gspca_dev->frame[j];
436 v4l2_get_timestamp(&frame->v4l2_buf.timestamp);
437 frame->v4l2_buf.sequence = gspca_dev->sequence++;
438 gspca_dev->image = frame->data;
439 gspca_dev->image_len = 0;
440 } else {
441 switch (gspca_dev->last_packet_type) {
442 case DISCARD_PACKET:
443 if (packet_type == LAST_PACKET) {
444 gspca_dev->last_packet_type = packet_type;
445 gspca_dev->image = NULL;
446 gspca_dev->image_len = 0;
447 }
448 return;
449 case LAST_PACKET:
450 return;
451 }
452 }
453
454 /* append the packet to the frame buffer */
455 if (len > 0) {
456 if (gspca_dev->image_len + len > gspca_dev->frsz) {
457 gspca_err(gspca_dev, "frame overflow %d > %d\n",
458 gspca_dev->image_len + len,
459 gspca_dev->frsz);
460 packet_type = DISCARD_PACKET;
461 } else {
462 /* !! image is NULL only when last pkt is LAST or DISCARD
463 if (gspca_dev->image == NULL) {
464 pr_err("gspca_frame_add() image == NULL\n");
465 return;
466 }
467 */
468 memcpy(gspca_dev->image + gspca_dev->image_len,
469 data, len);
470 gspca_dev->image_len += len;
471 }
472 }
473 gspca_dev->last_packet_type = packet_type;
474
475 /* if last packet, invalidate packet concatenation until
476 * next first packet, wake up the application and advance
477 * in the queue */
478 if (packet_type == LAST_PACKET) {
479 i = atomic_read(&gspca_dev->fr_i);
480 j = gspca_dev->fr_queue[i];
481 frame = &gspca_dev->frame[j];
482 frame->v4l2_buf.bytesused = gspca_dev->image_len;
483 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
484 | V4L2_BUF_FLAG_DONE)
485 & ~V4L2_BUF_FLAG_QUEUED;
486 i = (i + 1) % GSPCA_MAX_FRAMES;
487 atomic_set(&gspca_dev->fr_i, i);
488 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
489 gspca_dbg(gspca_dev, D_FRAM, "frame complete len:%d\n",
490 frame->v4l2_buf.bytesused);
491 gspca_dev->image = NULL;
492 gspca_dev->image_len = 0;
493 }
494 }
495 EXPORT_SYMBOL(gspca_frame_add);
496
497 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
498 enum v4l2_memory memory, unsigned int count)
499 {
500 struct gspca_frame *frame;
501 unsigned int frsz;
502 int i;
503
504 frsz = gspca_dev->pixfmt.sizeimage;
505 gspca_dbg(gspca_dev, D_STREAM, "frame alloc frsz: %d\n", frsz);
506 frsz = PAGE_ALIGN(frsz);
507 if (count >= GSPCA_MAX_FRAMES)
508 count = GSPCA_MAX_FRAMES - 1;
509 gspca_dev->frbuf = vmalloc_32(frsz * count);
510 if (!gspca_dev->frbuf) {
511 pr_err("frame alloc failed\n");
512 return -ENOMEM;
513 }
514 gspca_dev->capt_file = file;
515 gspca_dev->memory = memory;
516 gspca_dev->frsz = frsz;
517 gspca_dev->nframes = count;
518 for (i = 0; i < count; i++) {
519 frame = &gspca_dev->frame[i];
520 frame->v4l2_buf.index = i;
521 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
522 frame->v4l2_buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
523 frame->v4l2_buf.field = V4L2_FIELD_NONE;
524 frame->v4l2_buf.length = frsz;
525 frame->v4l2_buf.memory = memory;
526 frame->v4l2_buf.sequence = 0;
527 frame->data = gspca_dev->frbuf + i * frsz;
528 frame->v4l2_buf.m.offset = i * frsz;
529 }
530 atomic_set(&gspca_dev->fr_q, 0);
531 atomic_set(&gspca_dev->fr_i, 0);
532 gspca_dev->fr_o = 0;
533 return 0;
534 }
535
536 static void frame_free(struct gspca_dev *gspca_dev)
537 {
538 int i;
539
540 gspca_dbg(gspca_dev, D_STREAM, "frame free\n");
541 if (gspca_dev->frbuf != NULL) {
542 vfree(gspca_dev->frbuf);
543 gspca_dev->frbuf = NULL;
544 for (i = 0; i < gspca_dev->nframes; i++)
545 gspca_dev->frame[i].data = NULL;
546 }
547 gspca_dev->nframes = 0;
548 gspca_dev->frsz = 0;
549 gspca_dev->capt_file = NULL;
550 gspca_dev->memory = GSPCA_MEMORY_NO;
551 }
552
553 static void destroy_urbs(struct gspca_dev *gspca_dev)
554 {
555 struct urb *urb;
556 unsigned int i;
557
558 gspca_dbg(gspca_dev, D_STREAM, "kill transfer\n");
559 for (i = 0; i < MAX_NURBS; i++) {
560 urb = gspca_dev->urb[i];
561 if (urb == NULL)
562 break;
563
564 gspca_dev->urb[i] = NULL;
565 usb_kill_urb(urb);
566 usb_free_coherent(gspca_dev->dev,
567 urb->transfer_buffer_length,
568 urb->transfer_buffer,
569 urb->transfer_dma);
570 usb_free_urb(urb);
571 }
572 }
573
574 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
575 {
576 int ret;
577
578 if (gspca_dev->alt == 0)
579 return 0;
580 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
581 if (ret < 0)
582 pr_err("set alt 0 err %d\n", ret);
583 return ret;
584 }
585
586 /* Note: both the queue and the usb locks should be held when calling this */
587 static void gspca_stream_off(struct gspca_dev *gspca_dev)
588 {
589 gspca_dev->streaming = 0;
590 gspca_dev->usb_err = 0;
591 if (gspca_dev->sd_desc->stopN)
592 gspca_dev->sd_desc->stopN(gspca_dev);
593 destroy_urbs(gspca_dev);
594 gspca_input_destroy_urb(gspca_dev);
595 gspca_set_alt0(gspca_dev);
596 gspca_input_create_urb(gspca_dev);
597 if (gspca_dev->sd_desc->stop0)
598 gspca_dev->sd_desc->stop0(gspca_dev);
599 gspca_dbg(gspca_dev, D_STREAM, "stream off OK\n");
600 }
601
602 /*
603 * look for an input transfer endpoint in an alternate setting.
604 *
605 * If xfer_ep is invalid, return the first valid ep found, otherwise
606 * look for exactly the ep with address equal to xfer_ep.
607 */
608 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
609 int xfer, int xfer_ep)
610 {
611 struct usb_host_endpoint *ep;
612 int i, attr;
613
614 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
615 ep = &alt->endpoint[i];
616 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
617 if (attr == xfer
618 && ep->desc.wMaxPacketSize != 0
619 && usb_endpoint_dir_in(&ep->desc)
620 && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
621 return ep;
622 }
623 return NULL;
624 }
625
626 /* compute the minimum bandwidth for the current transfer */
627 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
628 {
629 u32 bandwidth;
630
631 /* get the (max) image size */
632 bandwidth = gspca_dev->pixfmt.sizeimage;
633
634 /* if the image is compressed, estimate its mean size */
635 if (!gspca_dev->cam.needs_full_bandwidth &&
636 bandwidth < gspca_dev->pixfmt.width *
637 gspca_dev->pixfmt.height)
638 bandwidth = bandwidth * 3 / 8; /* 0.375 */
639
640 /* estimate the frame rate */
641 if (gspca_dev->sd_desc->get_streamparm) {
642 struct v4l2_streamparm parm;
643
644 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
645 bandwidth *= parm.parm.capture.timeperframe.denominator;
646 bandwidth /= parm.parm.capture.timeperframe.numerator;
647 } else {
648
649 /* don't hope more than 15 fps with USB 1.1 and
650 * image resolution >= 640x480 */
651 if (gspca_dev->pixfmt.width >= 640
652 && gspca_dev->dev->speed == USB_SPEED_FULL)
653 bandwidth *= 15; /* 15 fps */
654 else
655 bandwidth *= 30; /* 30 fps */
656 }
657
658 gspca_dbg(gspca_dev, D_STREAM, "min bandwidth: %d\n", bandwidth);
659 return bandwidth;
660 }
661
662 /* endpoint table */
663 #define MAX_ALT 16
664 struct ep_tb_s {
665 u32 alt;
666 u32 bandwidth;
667 };
668
669 /*
670 * build the table of the endpoints
671 * and compute the minimum bandwidth for the image transfer
672 */
673 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
674 struct usb_interface *intf,
675 struct ep_tb_s *ep_tb)
676 {
677 struct usb_host_endpoint *ep;
678 int i, j, nbalt, psize, found;
679 u32 bandwidth, last_bw;
680
681 nbalt = intf->num_altsetting;
682 if (nbalt > MAX_ALT)
683 nbalt = MAX_ALT; /* fixme: should warn */
684
685 /* build the endpoint table */
686 i = 0;
687 last_bw = 0;
688 for (;;) {
689 ep_tb->bandwidth = 2000 * 2000 * 120;
690 found = 0;
691 for (j = 0; j < nbalt; j++) {
692 ep = alt_xfer(&intf->altsetting[j],
693 USB_ENDPOINT_XFER_ISOC,
694 gspca_dev->xfer_ep);
695 if (ep == NULL)
696 continue;
697 if (ep->desc.bInterval == 0) {
698 pr_err("alt %d iso endp with 0 interval\n", j);
699 continue;
700 }
701 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
702 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
703 bandwidth = psize * 1000;
704 if (gspca_dev->dev->speed == USB_SPEED_HIGH
705 || gspca_dev->dev->speed >= USB_SPEED_SUPER)
706 bandwidth *= 8;
707 bandwidth /= 1 << (ep->desc.bInterval - 1);
708 if (bandwidth <= last_bw)
709 continue;
710 if (bandwidth < ep_tb->bandwidth) {
711 ep_tb->bandwidth = bandwidth;
712 ep_tb->alt = j;
713 found = 1;
714 }
715 }
716 if (!found)
717 break;
718 gspca_dbg(gspca_dev, D_STREAM, "alt %d bandwidth %d\n",
719 ep_tb->alt, ep_tb->bandwidth);
720 last_bw = ep_tb->bandwidth;
721 i++;
722 ep_tb++;
723 }
724
725 /*
726 * If the camera:
727 * has a usb audio class interface (a built in usb mic); and
728 * is a usb 1 full speed device; and
729 * uses the max full speed iso bandwidth; and
730 * and has more than 1 alt setting
731 * then skip the highest alt setting to spare bandwidth for the mic
732 */
733 if (gspca_dev->audio &&
734 gspca_dev->dev->speed == USB_SPEED_FULL &&
735 last_bw >= 1000000 &&
736 i > 1) {
737 gspca_dbg(gspca_dev, D_STREAM, "dev has usb audio, skipping highest alt\n");
738 i--;
739 ep_tb--;
740 }
741
742 /* get the requested bandwidth and start at the highest atlsetting */
743 bandwidth = which_bandwidth(gspca_dev);
744 ep_tb--;
745 while (i > 1) {
746 ep_tb--;
747 if (ep_tb->bandwidth < bandwidth)
748 break;
749 i--;
750 }
751 return i;
752 }
753
754 /*
755 * create the URBs for image transfer
756 */
757 static int create_urbs(struct gspca_dev *gspca_dev,
758 struct usb_host_endpoint *ep)
759 {
760 struct urb *urb;
761 int n, nurbs, i, psize, npkt, bsize;
762
763 /* calculate the packet size and the number of packets */
764 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
765
766 if (!gspca_dev->cam.bulk) { /* isoc */
767
768 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
769 if (gspca_dev->pkt_size == 0)
770 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
771 else
772 psize = gspca_dev->pkt_size;
773 npkt = gspca_dev->cam.npkt;
774 if (npkt == 0)
775 npkt = 32; /* default value */
776 bsize = psize * npkt;
777 gspca_dbg(gspca_dev, D_STREAM,
778 "isoc %d pkts size %d = bsize:%d\n",
779 npkt, psize, bsize);
780 nurbs = DEF_NURBS;
781 } else { /* bulk */
782 npkt = 0;
783 bsize = gspca_dev->cam.bulk_size;
784 if (bsize == 0)
785 bsize = psize;
786 gspca_dbg(gspca_dev, D_STREAM, "bulk bsize:%d\n", bsize);
787 if (gspca_dev->cam.bulk_nurbs != 0)
788 nurbs = gspca_dev->cam.bulk_nurbs;
789 else
790 nurbs = 1;
791 }
792
793 for (n = 0; n < nurbs; n++) {
794 urb = usb_alloc_urb(npkt, GFP_KERNEL);
795 if (!urb)
796 return -ENOMEM;
797 gspca_dev->urb[n] = urb;
798 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
799 bsize,
800 GFP_KERNEL,
801 &urb->transfer_dma);
802
803 if (urb->transfer_buffer == NULL) {
804 pr_err("usb_alloc_coherent failed\n");
805 return -ENOMEM;
806 }
807 urb->dev = gspca_dev->dev;
808 urb->context = gspca_dev;
809 urb->transfer_buffer_length = bsize;
810 if (npkt != 0) { /* ISOC */
811 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
812 ep->desc.bEndpointAddress);
813 urb->transfer_flags = URB_ISO_ASAP
814 | URB_NO_TRANSFER_DMA_MAP;
815 urb->interval = 1 << (ep->desc.bInterval - 1);
816 urb->complete = isoc_irq;
817 urb->number_of_packets = npkt;
818 for (i = 0; i < npkt; i++) {
819 urb->iso_frame_desc[i].length = psize;
820 urb->iso_frame_desc[i].offset = psize * i;
821 }
822 } else { /* bulk */
823 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
824 ep->desc.bEndpointAddress);
825 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
826 urb->complete = bulk_irq;
827 }
828 }
829 return 0;
830 }
831
832 /*
833 * start the USB transfer
834 */
835 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
836 {
837 struct usb_interface *intf;
838 struct usb_host_endpoint *ep;
839 struct urb *urb;
840 struct ep_tb_s ep_tb[MAX_ALT];
841 int n, ret, xfer, alt, alt_idx;
842
843 /* reset the streaming variables */
844 gspca_dev->image = NULL;
845 gspca_dev->image_len = 0;
846 gspca_dev->last_packet_type = DISCARD_PACKET;
847 gspca_dev->sequence = 0;
848
849 gspca_dev->usb_err = 0;
850
851 /* do the specific subdriver stuff before endpoint selection */
852 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
853 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
854 if (gspca_dev->sd_desc->isoc_init) {
855 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
856 if (ret < 0)
857 return ret;
858 }
859 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
860 : USB_ENDPOINT_XFER_ISOC;
861
862 /* if bulk or the subdriver forced an altsetting, get the endpoint */
863 if (gspca_dev->alt != 0) {
864 gspca_dev->alt--; /* (previous version compatibility) */
865 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
866 gspca_dev->xfer_ep);
867 if (ep == NULL) {
868 pr_err("bad altsetting %d\n", gspca_dev->alt);
869 return -EIO;
870 }
871 ep_tb[0].alt = gspca_dev->alt;
872 alt_idx = 1;
873 } else {
874 /* else, compute the minimum bandwidth
875 * and build the endpoint table */
876 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
877 if (alt_idx <= 0) {
878 pr_err("no transfer endpoint found\n");
879 return -EIO;
880 }
881 }
882
883 /* set the highest alternate setting and
884 * loop until urb submit succeeds */
885 gspca_input_destroy_urb(gspca_dev);
886
887 gspca_dev->alt = ep_tb[--alt_idx].alt;
888 alt = -1;
889 for (;;) {
890 if (alt != gspca_dev->alt) {
891 alt = gspca_dev->alt;
892 if (intf->num_altsetting > 1) {
893 ret = usb_set_interface(gspca_dev->dev,
894 gspca_dev->iface,
895 alt);
896 if (ret < 0) {
897 if (ret == -ENOSPC)
898 goto retry; /*fixme: ugly*/
899 pr_err("set alt %d err %d\n", alt, ret);
900 goto out;
901 }
902 }
903 }
904 if (!gspca_dev->cam.no_urb_create) {
905 gspca_dbg(gspca_dev, D_STREAM, "init transfer alt %d\n",
906 alt);
907 ret = create_urbs(gspca_dev,
908 alt_xfer(&intf->altsetting[alt], xfer,
909 gspca_dev->xfer_ep));
910 if (ret < 0) {
911 destroy_urbs(gspca_dev);
912 goto out;
913 }
914 }
915
916 /* clear the bulk endpoint */
917 if (gspca_dev->cam.bulk)
918 usb_clear_halt(gspca_dev->dev,
919 gspca_dev->urb[0]->pipe);
920
921 /* start the cam */
922 ret = gspca_dev->sd_desc->start(gspca_dev);
923 if (ret < 0) {
924 destroy_urbs(gspca_dev);
925 goto out;
926 }
927 gspca_dev->streaming = 1;
928 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
929
930 /* some bulk transfers are started by the subdriver */
931 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
932 break;
933
934 /* submit the URBs */
935 for (n = 0; n < MAX_NURBS; n++) {
936 urb = gspca_dev->urb[n];
937 if (urb == NULL)
938 break;
939 ret = usb_submit_urb(urb, GFP_KERNEL);
940 if (ret < 0)
941 break;
942 }
943 if (ret >= 0)
944 break; /* transfer is started */
945
946 /* something when wrong
947 * stop the webcam and free the transfer resources */
948 gspca_stream_off(gspca_dev);
949 if (ret != -ENOSPC) {
950 pr_err("usb_submit_urb alt %d err %d\n",
951 gspca_dev->alt, ret);
952 goto out;
953 }
954
955 /* the bandwidth is not wide enough
956 * negotiate or try a lower alternate setting */
957 retry:
958 gspca_err(gspca_dev, "alt %d - bandwidth not wide enough, trying again\n",
959 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 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1083 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1084 j = 0;
1085 for (;;) {
1086 if (fmt_tb[j] == fmt_tb[index])
1087 break;
1088 j++;
1089 }
1090 if (j == index) {
1091 if (fmtdesc->index == index)
1092 break; /* new format */
1093 index++;
1094 if (index >= ARRAY_SIZE(fmt_tb))
1095 return -EINVAL;
1096 }
1097 }
1098 if (i < 0)
1099 return -EINVAL; /* no more format */
1100
1101 fmtdesc->pixelformat = fmt_tb[index];
1102 if (gspca_dev->cam.cam_mode[i].sizeimage <
1103 gspca_dev->cam.cam_mode[i].width *
1104 gspca_dev->cam.cam_mode[i].height)
1105 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1106 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1107 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1108 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1109 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1110 fmtdesc->description[4] = '\0';
1111 return 0;
1112 }
1113
1114 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1115 struct v4l2_format *fmt)
1116 {
1117 struct gspca_dev *gspca_dev = video_drvdata(file);
1118
1119 fmt->fmt.pix = gspca_dev->pixfmt;
1120 /* some drivers use priv internally, zero it before giving it back to
1121 the core */
1122 fmt->fmt.pix.priv = 0;
1123 return 0;
1124 }
1125
1126 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1127 struct v4l2_format *fmt)
1128 {
1129 int w, h, mode, mode2;
1130
1131 w = fmt->fmt.pix.width;
1132 h = fmt->fmt.pix.height;
1133
1134 PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1135 fmt->fmt.pix.pixelformat, w, h);
1136
1137 /* search the nearest mode for width and height */
1138 mode = wxh_to_nearest_mode(gspca_dev, w, h);
1139
1140 /* OK if right palette */
1141 if (gspca_dev->cam.cam_mode[mode].pixelformat
1142 != fmt->fmt.pix.pixelformat) {
1143
1144 /* else, search the closest mode with the same pixel format */
1145 mode2 = gspca_get_mode(gspca_dev, mode,
1146 fmt->fmt.pix.pixelformat);
1147 if (mode2 >= 0)
1148 mode = mode2;
1149 }
1150 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1151 if (gspca_dev->sd_desc->try_fmt) {
1152 /* pass original resolution to subdriver try_fmt */
1153 fmt->fmt.pix.width = w;
1154 fmt->fmt.pix.height = h;
1155 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1156 }
1157 /* some drivers use priv internally, zero it before giving it back to
1158 the core */
1159 fmt->fmt.pix.priv = 0;
1160 return mode; /* used when s_fmt */
1161 }
1162
1163 static int vidioc_try_fmt_vid_cap(struct file *file,
1164 void *priv,
1165 struct v4l2_format *fmt)
1166 {
1167 struct gspca_dev *gspca_dev = video_drvdata(file);
1168 int ret;
1169
1170 ret = try_fmt_vid_cap(gspca_dev, fmt);
1171 if (ret < 0)
1172 return ret;
1173 return 0;
1174 }
1175
1176 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1177 struct v4l2_format *fmt)
1178 {
1179 struct gspca_dev *gspca_dev = video_drvdata(file);
1180 int ret;
1181
1182 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1183 return -ERESTARTSYS;
1184
1185 ret = try_fmt_vid_cap(gspca_dev, fmt);
1186 if (ret < 0)
1187 goto out;
1188
1189 if (gspca_dev->nframes != 0
1190 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1191 ret = -EINVAL;
1192 goto out;
1193 }
1194
1195 if (gspca_dev->streaming) {
1196 ret = -EBUSY;
1197 goto out;
1198 }
1199 gspca_dev->curr_mode = ret;
1200 if (gspca_dev->sd_desc->try_fmt)
1201 /* subdriver try_fmt can modify format parameters */
1202 gspca_dev->pixfmt = fmt->fmt.pix;
1203 else
1204 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1205
1206 ret = 0;
1207 out:
1208 mutex_unlock(&gspca_dev->queue_lock);
1209 return ret;
1210 }
1211
1212 static int vidioc_enum_framesizes(struct file *file, void *priv,
1213 struct v4l2_frmsizeenum *fsize)
1214 {
1215 struct gspca_dev *gspca_dev = video_drvdata(file);
1216 int i;
1217 __u32 index = 0;
1218
1219 if (gspca_dev->sd_desc->enum_framesizes)
1220 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1221
1222 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1223 if (fsize->pixel_format !=
1224 gspca_dev->cam.cam_mode[i].pixelformat)
1225 continue;
1226
1227 if (fsize->index == index) {
1228 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1229 fsize->discrete.width =
1230 gspca_dev->cam.cam_mode[i].width;
1231 fsize->discrete.height =
1232 gspca_dev->cam.cam_mode[i].height;
1233 return 0;
1234 }
1235 index++;
1236 }
1237
1238 return -EINVAL;
1239 }
1240
1241 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1242 struct v4l2_frmivalenum *fival)
1243 {
1244 struct gspca_dev *gspca_dev = video_drvdata(filp);
1245 int mode;
1246 __u32 i;
1247
1248 mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1249 if (mode < 0)
1250 return -EINVAL;
1251
1252 if (gspca_dev->cam.mode_framerates == NULL ||
1253 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1254 return -EINVAL;
1255
1256 if (fival->pixel_format !=
1257 gspca_dev->cam.cam_mode[mode].pixelformat)
1258 return -EINVAL;
1259
1260 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1261 if (fival->index == i) {
1262 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1263 fival->discrete.numerator = 1;
1264 fival->discrete.denominator =
1265 gspca_dev->cam.mode_framerates[mode].rates[i];
1266 return 0;
1267 }
1268 }
1269
1270 return -EINVAL;
1271 }
1272
1273 static void gspca_release(struct v4l2_device *v4l2_device)
1274 {
1275 struct gspca_dev *gspca_dev =
1276 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1277
1278 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1279 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1280 kfree(gspca_dev->usb_buf);
1281 kfree(gspca_dev);
1282 }
1283
1284 static int dev_open(struct file *file)
1285 {
1286 struct gspca_dev *gspca_dev = video_drvdata(file);
1287 int ret;
1288
1289 gspca_dbg(gspca_dev, D_STREAM, "[%s] open\n", current->comm);
1290
1291 /* protect the subdriver against rmmod */
1292 if (!try_module_get(gspca_dev->module))
1293 return -ENODEV;
1294
1295 ret = v4l2_fh_open(file);
1296 if (ret)
1297 module_put(gspca_dev->module);
1298 return ret;
1299 }
1300
1301 static int dev_close(struct file *file)
1302 {
1303 struct gspca_dev *gspca_dev = video_drvdata(file);
1304
1305 gspca_dbg(gspca_dev, D_STREAM, "[%s] close\n", current->comm);
1306
1307 /* Needed for gspca_stream_off, always lock before queue_lock! */
1308 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1309 return -ERESTARTSYS;
1310
1311 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1312 mutex_unlock(&gspca_dev->usb_lock);
1313 return -ERESTARTSYS;
1314 }
1315
1316 /* if the file did the capture, free the streaming resources */
1317 if (gspca_dev->capt_file == file) {
1318 if (gspca_dev->streaming)
1319 gspca_stream_off(gspca_dev);
1320 frame_free(gspca_dev);
1321 }
1322 module_put(gspca_dev->module);
1323 mutex_unlock(&gspca_dev->queue_lock);
1324 mutex_unlock(&gspca_dev->usb_lock);
1325
1326 gspca_dbg(gspca_dev, D_STREAM, "close done\n");
1327
1328 return v4l2_fh_release(file);
1329 }
1330
1331 static int vidioc_querycap(struct file *file, void *priv,
1332 struct v4l2_capability *cap)
1333 {
1334 struct gspca_dev *gspca_dev = video_drvdata(file);
1335
1336 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1337 sizeof cap->driver);
1338 if (gspca_dev->dev->product != NULL) {
1339 strlcpy((char *) cap->card, gspca_dev->dev->product,
1340 sizeof cap->card);
1341 } else {
1342 snprintf((char *) cap->card, sizeof cap->card,
1343 "USB Camera (%04x:%04x)",
1344 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1345 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1346 }
1347 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1348 sizeof(cap->bus_info));
1349 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1350 | V4L2_CAP_STREAMING
1351 | V4L2_CAP_READWRITE;
1352 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1353 return 0;
1354 }
1355
1356 static int vidioc_enum_input(struct file *file, void *priv,
1357 struct v4l2_input *input)
1358 {
1359 struct gspca_dev *gspca_dev = video_drvdata(file);
1360
1361 if (input->index != 0)
1362 return -EINVAL;
1363 input->type = V4L2_INPUT_TYPE_CAMERA;
1364 input->status = gspca_dev->cam.input_flags;
1365 strlcpy(input->name, gspca_dev->sd_desc->name,
1366 sizeof input->name);
1367 return 0;
1368 }
1369
1370 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1371 {
1372 *i = 0;
1373 return 0;
1374 }
1375
1376 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1377 {
1378 if (i > 0)
1379 return -EINVAL;
1380 return (0);
1381 }
1382
1383 static int vidioc_reqbufs(struct file *file, void *priv,
1384 struct v4l2_requestbuffers *rb)
1385 {
1386 struct gspca_dev *gspca_dev = video_drvdata(file);
1387 int i, ret = 0, streaming;
1388
1389 i = rb->memory; /* (avoid compilation warning) */
1390 switch (i) {
1391 case GSPCA_MEMORY_READ: /* (internal call) */
1392 case V4L2_MEMORY_MMAP:
1393 case V4L2_MEMORY_USERPTR:
1394 break;
1395 default:
1396 return -EINVAL;
1397 }
1398 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1399 return -ERESTARTSYS;
1400
1401 if (gspca_dev->memory != GSPCA_MEMORY_NO
1402 && gspca_dev->memory != GSPCA_MEMORY_READ
1403 && gspca_dev->memory != rb->memory) {
1404 ret = -EBUSY;
1405 goto out;
1406 }
1407
1408 /* only one file may do the capture */
1409 if (gspca_dev->capt_file != NULL
1410 && gspca_dev->capt_file != file) {
1411 ret = -EBUSY;
1412 goto out;
1413 }
1414
1415 /* if allocated, the buffers must not be mapped */
1416 for (i = 0; i < gspca_dev->nframes; i++) {
1417 if (gspca_dev->frame[i].vma_use_count) {
1418 ret = -EBUSY;
1419 goto out;
1420 }
1421 }
1422
1423 /* stop streaming */
1424 streaming = gspca_dev->streaming;
1425 if (streaming) {
1426 gspca_stream_off(gspca_dev);
1427
1428 /* Don't restart the stream when switching from read
1429 * to mmap mode */
1430 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1431 streaming = 0;
1432 }
1433
1434 /* free the previous allocated buffers, if any */
1435 if (gspca_dev->nframes != 0)
1436 frame_free(gspca_dev);
1437 if (rb->count == 0) /* unrequest */
1438 goto out;
1439 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1440 if (ret == 0) {
1441 rb->count = gspca_dev->nframes;
1442 if (streaming)
1443 ret = gspca_init_transfer(gspca_dev);
1444 }
1445 out:
1446 mutex_unlock(&gspca_dev->queue_lock);
1447 gspca_dbg(gspca_dev, D_STREAM, "reqbufs st:%d c:%d\n", ret, rb->count);
1448 return ret;
1449 }
1450
1451 static int vidioc_querybuf(struct file *file, void *priv,
1452 struct v4l2_buffer *v4l2_buf)
1453 {
1454 struct gspca_dev *gspca_dev = video_drvdata(file);
1455 struct gspca_frame *frame;
1456
1457 if (v4l2_buf->index >= gspca_dev->nframes)
1458 return -EINVAL;
1459
1460 frame = &gspca_dev->frame[v4l2_buf->index];
1461 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1462 return 0;
1463 }
1464
1465 static int vidioc_streamon(struct file *file, void *priv,
1466 enum v4l2_buf_type buf_type)
1467 {
1468 struct gspca_dev *gspca_dev = video_drvdata(file);
1469 int ret;
1470
1471 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1472 return -EINVAL;
1473 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1474 return -ERESTARTSYS;
1475
1476 /* check the capture file */
1477 if (gspca_dev->capt_file != file) {
1478 ret = -EBUSY;
1479 goto out;
1480 }
1481
1482 if (gspca_dev->nframes == 0
1483 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1484 ret = -EINVAL;
1485 goto out;
1486 }
1487 if (!gspca_dev->streaming) {
1488 ret = gspca_init_transfer(gspca_dev);
1489 if (ret < 0)
1490 goto out;
1491 }
1492 PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1493 gspca_dev->pixfmt.pixelformat,
1494 gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1495 ret = 0;
1496 out:
1497 mutex_unlock(&gspca_dev->queue_lock);
1498 return ret;
1499 }
1500
1501 static int vidioc_streamoff(struct file *file, void *priv,
1502 enum v4l2_buf_type buf_type)
1503 {
1504 struct gspca_dev *gspca_dev = video_drvdata(file);
1505 int i, ret;
1506
1507 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1508 return -EINVAL;
1509
1510 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1511 return -ERESTARTSYS;
1512
1513 if (!gspca_dev->streaming) {
1514 ret = 0;
1515 goto out;
1516 }
1517
1518 /* check the capture file */
1519 if (gspca_dev->capt_file != file) {
1520 ret = -EBUSY;
1521 goto out;
1522 }
1523
1524 /* stop streaming */
1525 gspca_stream_off(gspca_dev);
1526 /* In case another thread is waiting in dqbuf */
1527 wake_up_interruptible(&gspca_dev->wq);
1528
1529 /* empty the transfer queues */
1530 for (i = 0; i < gspca_dev->nframes; i++)
1531 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1532 atomic_set(&gspca_dev->fr_q, 0);
1533 atomic_set(&gspca_dev->fr_i, 0);
1534 gspca_dev->fr_o = 0;
1535 ret = 0;
1536 out:
1537 mutex_unlock(&gspca_dev->queue_lock);
1538 return ret;
1539 }
1540
1541 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1542 struct v4l2_jpegcompression *jpegcomp)
1543 {
1544 struct gspca_dev *gspca_dev = video_drvdata(file);
1545
1546 gspca_dev->usb_err = 0;
1547 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1548 }
1549
1550 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1551 const struct v4l2_jpegcompression *jpegcomp)
1552 {
1553 struct gspca_dev *gspca_dev = video_drvdata(file);
1554
1555 gspca_dev->usb_err = 0;
1556 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1557 }
1558
1559 static int vidioc_g_parm(struct file *filp, void *priv,
1560 struct v4l2_streamparm *parm)
1561 {
1562 struct gspca_dev *gspca_dev = video_drvdata(filp);
1563
1564 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1565
1566 if (gspca_dev->sd_desc->get_streamparm) {
1567 gspca_dev->usb_err = 0;
1568 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1569 return gspca_dev->usb_err;
1570 }
1571 return 0;
1572 }
1573
1574 static int vidioc_s_parm(struct file *filp, void *priv,
1575 struct v4l2_streamparm *parm)
1576 {
1577 struct gspca_dev *gspca_dev = video_drvdata(filp);
1578 unsigned int n;
1579
1580 n = parm->parm.capture.readbuffers;
1581 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1582 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1583 else
1584 gspca_dev->nbufread = n;
1585
1586 if (gspca_dev->sd_desc->set_streamparm) {
1587 gspca_dev->usb_err = 0;
1588 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1589 return gspca_dev->usb_err;
1590 }
1591
1592 return 0;
1593 }
1594
1595 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1596 {
1597 struct gspca_dev *gspca_dev = video_drvdata(file);
1598 struct gspca_frame *frame;
1599 struct page *page;
1600 unsigned long addr, start, size;
1601 int i, ret;
1602
1603 start = vma->vm_start;
1604 size = vma->vm_end - vma->vm_start;
1605 gspca_dbg(gspca_dev, D_STREAM, "mmap start:%08x size:%d\n",
1606 (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 gspca_dbg(gspca_dev, D_STREAM, "mmap bad memory type\n");
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 gspca_dbg(gspca_dev, D_STREAM, "mmap no frame buffer found\n");
1629 ret = -EINVAL;
1630 goto out;
1631 }
1632 if (size != frame->v4l2_buf.length) {
1633 gspca_dbg(gspca_dev, D_STREAM, "mmap bad size\n");
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 gspca_dbg(gspca_dev, D_FRAM, "dqbuf\n");
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 gspca_dbg(gspca_dev, D_FRAM, "dqbuf %d\n", 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 gspca_err(gspca_dev, "dqbuf cp to user failed\n");
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 gspca_dbg(gspca_dev, D_FRAM, "qbuf %d\n", 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 gspca_dbg(gspca_dev, D_FRAM,
1785 "qbuf idx %d >= %d\n", index, gspca_dev->nframes);
1786 ret = -EINVAL;
1787 goto out;
1788 }
1789 if (v4l2_buf->memory != gspca_dev->memory) {
1790 gspca_dbg(gspca_dev, D_FRAM, "qbuf bad memory type\n");
1791 ret = -EINVAL;
1792 goto out;
1793 }
1794
1795 frame = &gspca_dev->frame[index];
1796 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1797 gspca_dbg(gspca_dev, D_FRAM, "qbuf bad state\n");
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 gspca_dbg(gspca_dev, D_STREAM, "read alloc\n");
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 gspca_dbg(gspca_dev, D_STREAM, "read reqbuf err %d\n",
1846 ret);
1847 goto out;
1848 }
1849 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1850 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1851 v4l2_buf.memory = GSPCA_MEMORY_READ;
1852 for (i = 0; i < gspca_dev->nbufread; i++) {
1853 v4l2_buf.index = i;
1854 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1855 if (ret != 0) {
1856 gspca_dbg(gspca_dev, D_STREAM, "read qbuf err: %d\n",
1857 ret);
1858 goto out;
1859 }
1860 }
1861 }
1862
1863 /* start streaming */
1864 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1865 if (ret != 0)
1866 gspca_dbg(gspca_dev, D_STREAM, "read streamon err %d\n", ret);
1867 out:
1868 mutex_unlock(&gspca_dev->usb_lock);
1869 return ret;
1870 }
1871
1872 static __poll_t dev_poll(struct file *file, poll_table *wait)
1873 {
1874 struct gspca_dev *gspca_dev = video_drvdata(file);
1875 __poll_t req_events = poll_requested_events(wait);
1876 __poll_t ret = 0;
1877
1878 gspca_dbg(gspca_dev, D_FRAM, "poll\n");
1879
1880 if (req_events & EPOLLPRI)
1881 ret |= v4l2_ctrl_poll(file, wait);
1882
1883 if (req_events & (EPOLLIN | EPOLLRDNORM)) {
1884 /* if reqbufs is not done, the user would use read() */
1885 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1886 if (read_alloc(gspca_dev, file) != 0) {
1887 ret |= EPOLLERR;
1888 goto out;
1889 }
1890 }
1891
1892 poll_wait(file, &gspca_dev->wq, wait);
1893
1894 /* check if an image has been received */
1895 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1896 ret |= EPOLLERR;
1897 goto out;
1898 }
1899 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1900 ret |= EPOLLIN | EPOLLRDNORM;
1901 mutex_unlock(&gspca_dev->queue_lock);
1902 }
1903
1904 out:
1905 if (!gspca_dev->present)
1906 ret |= EPOLLHUP;
1907
1908 return ret;
1909 }
1910
1911 static ssize_t dev_read(struct file *file, char __user *data,
1912 size_t count, loff_t *ppos)
1913 {
1914 struct gspca_dev *gspca_dev = video_drvdata(file);
1915 struct gspca_frame *frame;
1916 struct v4l2_buffer v4l2_buf;
1917 struct timeval timestamp;
1918 int n, ret, ret2;
1919
1920 gspca_dbg(gspca_dev, D_FRAM, "read (%zd)\n", count);
1921 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1922 ret = read_alloc(gspca_dev, file);
1923 if (ret != 0)
1924 return ret;
1925 }
1926
1927 /* get a frame */
1928 v4l2_get_timestamp(&timestamp);
1929 timestamp.tv_sec--;
1930 n = 2;
1931 for (;;) {
1932 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1933 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1934 v4l2_buf.memory = GSPCA_MEMORY_READ;
1935 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1936 if (ret != 0) {
1937 gspca_dbg(gspca_dev, D_STREAM, "read dqbuf err %d\n",
1938 ret);
1939 return ret;
1940 }
1941
1942 /* if the process slept for more than 1 second,
1943 * get a newer frame */
1944 frame = &gspca_dev->frame[v4l2_buf.index];
1945 if (--n < 0)
1946 break; /* avoid infinite loop */
1947 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1948 break;
1949 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1950 if (ret != 0) {
1951 gspca_dbg(gspca_dev, D_STREAM, "read qbuf err %d\n",
1952 ret);
1953 return ret;
1954 }
1955 }
1956
1957 /* copy the frame */
1958 if (count > frame->v4l2_buf.bytesused)
1959 count = frame->v4l2_buf.bytesused;
1960 ret = copy_to_user(data, frame->data, count);
1961 if (ret != 0) {
1962 gspca_err(gspca_dev, "read cp to user lack %d / %zd\n",
1963 ret, count);
1964 ret = -EFAULT;
1965 goto out;
1966 }
1967 ret = count;
1968 out:
1969 /* in each case, requeue the buffer */
1970 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1971 if (ret2 != 0)
1972 return ret2;
1973 return ret;
1974 }
1975
1976 static const struct v4l2_file_operations dev_fops = {
1977 .owner = THIS_MODULE,
1978 .open = dev_open,
1979 .release = dev_close,
1980 .read = dev_read,
1981 .mmap = dev_mmap,
1982 .unlocked_ioctl = video_ioctl2,
1983 .poll = dev_poll,
1984 };
1985
1986 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1987 .vidioc_querycap = vidioc_querycap,
1988 .vidioc_dqbuf = vidioc_dqbuf,
1989 .vidioc_qbuf = vidioc_qbuf,
1990 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1991 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1992 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1993 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1994 .vidioc_streamon = vidioc_streamon,
1995 .vidioc_enum_input = vidioc_enum_input,
1996 .vidioc_g_input = vidioc_g_input,
1997 .vidioc_s_input = vidioc_s_input,
1998 .vidioc_reqbufs = vidioc_reqbufs,
1999 .vidioc_querybuf = vidioc_querybuf,
2000 .vidioc_streamoff = vidioc_streamoff,
2001 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2002 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2003 .vidioc_g_parm = vidioc_g_parm,
2004 .vidioc_s_parm = vidioc_s_parm,
2005 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2006 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2007 #ifdef CONFIG_VIDEO_ADV_DEBUG
2008 .vidioc_g_chip_info = vidioc_g_chip_info,
2009 .vidioc_g_register = vidioc_g_register,
2010 .vidioc_s_register = vidioc_s_register,
2011 #endif
2012 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2013 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2014 };
2015
2016 static const struct video_device gspca_template = {
2017 .name = "gspca main driver",
2018 .fops = &dev_fops,
2019 .ioctl_ops = &dev_ioctl_ops,
2020 .release = video_device_release_empty, /* We use v4l2_dev.release */
2021 };
2022
2023 /*
2024 * probe and create a new gspca device
2025 *
2026 * This function must be called by the sub-driver when it is
2027 * called for probing a new device.
2028 */
2029 int gspca_dev_probe2(struct usb_interface *intf,
2030 const struct usb_device_id *id,
2031 const struct sd_desc *sd_desc,
2032 int dev_size,
2033 struct module *module)
2034 {
2035 struct gspca_dev *gspca_dev;
2036 struct usb_device *dev = interface_to_usbdev(intf);
2037 int ret;
2038
2039 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2040 sd_desc->name, id->idVendor, id->idProduct);
2041
2042 /* create the device */
2043 if (dev_size < sizeof *gspca_dev)
2044 dev_size = sizeof *gspca_dev;
2045 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2046 if (!gspca_dev) {
2047 pr_err("couldn't kzalloc gspca struct\n");
2048 return -ENOMEM;
2049 }
2050 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2051 if (!gspca_dev->usb_buf) {
2052 pr_err("out of memory\n");
2053 ret = -ENOMEM;
2054 goto out;
2055 }
2056 gspca_dev->dev = dev;
2057 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2058 gspca_dev->xfer_ep = -1;
2059
2060 /* check if any audio device */
2061 if (dev->actconfig->desc.bNumInterfaces != 1) {
2062 int i;
2063 struct usb_interface *intf2;
2064
2065 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2066 intf2 = dev->actconfig->interface[i];
2067 if (intf2 != NULL
2068 && intf2->altsetting != NULL
2069 && intf2->altsetting->desc.bInterfaceClass ==
2070 USB_CLASS_AUDIO) {
2071 gspca_dev->audio = 1;
2072 break;
2073 }
2074 }
2075 }
2076
2077 gspca_dev->v4l2_dev.release = gspca_release;
2078 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2079 if (ret)
2080 goto out;
2081 gspca_dev->sd_desc = sd_desc;
2082 gspca_dev->nbufread = 2;
2083 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2084 gspca_dev->vdev = gspca_template;
2085 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2086 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2087 gspca_dev->module = module;
2088 gspca_dev->present = 1;
2089
2090 mutex_init(&gspca_dev->usb_lock);
2091 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2092 mutex_init(&gspca_dev->queue_lock);
2093 init_waitqueue_head(&gspca_dev->wq);
2094
2095 /* configure the subdriver and initialize the USB device */
2096 ret = sd_desc->config(gspca_dev, id);
2097 if (ret < 0)
2098 goto out;
2099 ret = sd_desc->init(gspca_dev);
2100 if (ret < 0)
2101 goto out;
2102 if (sd_desc->init_controls)
2103 ret = sd_desc->init_controls(gspca_dev);
2104 if (ret < 0)
2105 goto out;
2106 gspca_set_default_mode(gspca_dev);
2107
2108 ret = gspca_input_connect(gspca_dev);
2109 if (ret)
2110 goto out;
2111
2112 /*
2113 * Don't take usb_lock for these ioctls. This improves latency if
2114 * usb_lock is taken for a long time, e.g. when changing a control
2115 * value, and a new frame is ready to be dequeued.
2116 */
2117 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2118 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2119 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2120 #ifdef CONFIG_VIDEO_ADV_DEBUG
2121 if (!gspca_dev->sd_desc->get_register)
2122 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2123 if (!gspca_dev->sd_desc->set_register)
2124 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2125 #endif
2126 if (!gspca_dev->sd_desc->get_jcomp)
2127 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2128 if (!gspca_dev->sd_desc->set_jcomp)
2129 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2130
2131 /* init video stuff */
2132 ret = video_register_device(&gspca_dev->vdev,
2133 VFL_TYPE_GRABBER,
2134 -1);
2135 if (ret < 0) {
2136 pr_err("video_register_device err %d\n", ret);
2137 goto out;
2138 }
2139
2140 usb_set_intfdata(intf, gspca_dev);
2141 gspca_dbg(gspca_dev, D_PROBE, "%s created\n",
2142 video_device_node_name(&gspca_dev->vdev));
2143
2144 gspca_input_create_urb(gspca_dev);
2145
2146 return 0;
2147 out:
2148 #if IS_ENABLED(CONFIG_INPUT)
2149 if (gspca_dev->input_dev)
2150 input_unregister_device(gspca_dev->input_dev);
2151 #endif
2152 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2153 kfree(gspca_dev->usb_buf);
2154 kfree(gspca_dev);
2155 return ret;
2156 }
2157 EXPORT_SYMBOL(gspca_dev_probe2);
2158
2159 /* same function as the previous one, but check the interface */
2160 int gspca_dev_probe(struct usb_interface *intf,
2161 const struct usb_device_id *id,
2162 const struct sd_desc *sd_desc,
2163 int dev_size,
2164 struct module *module)
2165 {
2166 struct usb_device *dev = interface_to_usbdev(intf);
2167
2168 /* we don't handle multi-config cameras */
2169 if (dev->descriptor.bNumConfigurations != 1) {
2170 pr_err("%04x:%04x too many config\n",
2171 id->idVendor, id->idProduct);
2172 return -ENODEV;
2173 }
2174
2175 /* the USB video interface must be the first one */
2176 if (dev->actconfig->desc.bNumInterfaces != 1
2177 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2178 return -ENODEV;
2179
2180 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2181 }
2182 EXPORT_SYMBOL(gspca_dev_probe);
2183
2184 /*
2185 * USB disconnection
2186 *
2187 * This function must be called by the sub-driver
2188 * when the device disconnects, after the specific resources are freed.
2189 */
2190 void gspca_disconnect(struct usb_interface *intf)
2191 {
2192 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2193 #if IS_ENABLED(CONFIG_INPUT)
2194 struct input_dev *input_dev;
2195 #endif
2196
2197 gspca_dbg(gspca_dev, D_PROBE, "%s disconnect\n",
2198 video_device_node_name(&gspca_dev->vdev));
2199
2200 mutex_lock(&gspca_dev->usb_lock);
2201
2202 gspca_dev->present = 0;
2203 destroy_urbs(gspca_dev);
2204
2205 #if IS_ENABLED(CONFIG_INPUT)
2206 gspca_input_destroy_urb(gspca_dev);
2207 input_dev = gspca_dev->input_dev;
2208 if (input_dev) {
2209 gspca_dev->input_dev = NULL;
2210 input_unregister_device(input_dev);
2211 }
2212 #endif
2213 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2214 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2215 gspca_dev->sd_desc->stop0(gspca_dev);
2216 gspca_dev->streaming = 0;
2217 gspca_dev->dev = NULL;
2218 wake_up_interruptible(&gspca_dev->wq);
2219
2220 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2221 video_unregister_device(&gspca_dev->vdev);
2222
2223 mutex_unlock(&gspca_dev->usb_lock);
2224
2225 /* (this will call gspca_release() immediately or on last close) */
2226 v4l2_device_put(&gspca_dev->v4l2_dev);
2227 }
2228 EXPORT_SYMBOL(gspca_disconnect);
2229
2230 #ifdef CONFIG_PM
2231 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2232 {
2233 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2234
2235 gspca_input_destroy_urb(gspca_dev);
2236
2237 if (!gspca_dev->streaming)
2238 return 0;
2239
2240 mutex_lock(&gspca_dev->usb_lock);
2241 gspca_dev->frozen = 1; /* avoid urb error messages */
2242 gspca_dev->usb_err = 0;
2243 if (gspca_dev->sd_desc->stopN)
2244 gspca_dev->sd_desc->stopN(gspca_dev);
2245 destroy_urbs(gspca_dev);
2246 gspca_set_alt0(gspca_dev);
2247 if (gspca_dev->sd_desc->stop0)
2248 gspca_dev->sd_desc->stop0(gspca_dev);
2249 mutex_unlock(&gspca_dev->usb_lock);
2250
2251 return 0;
2252 }
2253 EXPORT_SYMBOL(gspca_suspend);
2254
2255 int gspca_resume(struct usb_interface *intf)
2256 {
2257 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2258 int streaming, ret = 0;
2259
2260 mutex_lock(&gspca_dev->usb_lock);
2261 gspca_dev->frozen = 0;
2262 gspca_dev->usb_err = 0;
2263 gspca_dev->sd_desc->init(gspca_dev);
2264 /*
2265 * Most subdrivers send all ctrl values on sd_start and thus
2266 * only write to the device registers on s_ctrl when streaming ->
2267 * Clear streaming to avoid setting all ctrls twice.
2268 */
2269 streaming = gspca_dev->streaming;
2270 gspca_dev->streaming = 0;
2271 if (streaming)
2272 ret = gspca_init_transfer(gspca_dev);
2273 else
2274 gspca_input_create_urb(gspca_dev);
2275 mutex_unlock(&gspca_dev->usb_lock);
2276
2277 return ret;
2278 }
2279 EXPORT_SYMBOL(gspca_resume);
2280 #endif
2281
2282 /* -- module insert / remove -- */
2283 static int __init gspca_init(void)
2284 {
2285 pr_info("v" GSPCA_VERSION " registered\n");
2286 return 0;
2287 }
2288 static void __exit gspca_exit(void)
2289 {
2290 }
2291
2292 module_init(gspca_init);
2293 module_exit(gspca_exit);
2294
2295 module_param_named(debug, gspca_debug, int, 0644);
2296 MODULE_PARM_DESC(debug,
2297 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");
CRIS linux kernel tree