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serial: xilinx_uartps: fix bad register write in console_write
[linux-2.6-xlnx.git] / drivers / media / video / gspca / gspca.c
blob31721eadc597de48e749f6202a98ddb819910cbf
1 /*
2 * Main USB camera driver
3 *
4 * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
5 *
6 * Camera button input handling by Márton Németh
7 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26 #define GSPCA_VERSION "2.14.0"
27
28 #include <linux/init.h>
29 #include <linux/fs.h>
30 #include <linux/vmalloc.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/string.h>
35 #include <linux/pagemap.h>
36 #include <linux/io.h>
37 #include <asm/page.h>
38 #include <linux/uaccess.h>
39 #include <linux/ktime.h>
40 #include <media/v4l2-ioctl.h>
41 #include <media/v4l2-ctrls.h>
42 #include <media/v4l2-fh.h>
43 #include <media/v4l2-event.h>
44
45 #include "gspca.h"
46
47 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
48 #include <linux/input.h>
49 #include <linux/usb/input.h>
50 #endif
51
52 /* global values */
53 #define DEF_NURBS 3 /* default number of URBs */
54 #if DEF_NURBS > MAX_NURBS
55 #error "DEF_NURBS too big"
56 #endif
57
58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
59 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
60 MODULE_LICENSE("GPL");
61 MODULE_VERSION(GSPCA_VERSION);
62
63 #ifdef GSPCA_DEBUG
64 int gspca_debug = D_ERR | D_PROBE;
65 EXPORT_SYMBOL(gspca_debug);
66
67 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
68 {
69 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
70 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
71 txt,
72 pixfmt & 0xff,
73 (pixfmt >> 8) & 0xff,
74 (pixfmt >> 16) & 0xff,
75 pixfmt >> 24,
76 w, h);
77 } else {
78 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
79 txt,
80 pixfmt,
81 w, h);
82 }
83 }
84 #else
85 #define PDEBUG_MODE(txt, pixfmt, w, h)
86 #endif
87
88 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
89 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
90 #define GSPCA_MEMORY_READ 7
91
92 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
93
94 /*
95 * VMA operations.
96 */
97 static void gspca_vm_open(struct vm_area_struct *vma)
98 {
99 struct gspca_frame *frame = vma->vm_private_data;
100
101 frame->vma_use_count++;
102 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
103 }
104
105 static void gspca_vm_close(struct vm_area_struct *vma)
106 {
107 struct gspca_frame *frame = vma->vm_private_data;
108
109 if (--frame->vma_use_count <= 0)
110 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
111 }
112
113 static const struct vm_operations_struct gspca_vm_ops = {
114 .open = gspca_vm_open,
115 .close = gspca_vm_close,
116 };
117
118 /*
119 * Input and interrupt endpoint handling functions
120 */
121 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
122 static void int_irq(struct urb *urb)
123 {
124 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
125 int ret;
126
127 ret = urb->status;
128 switch (ret) {
129 case 0:
130 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
131 urb->transfer_buffer, urb->actual_length) < 0) {
132 PDEBUG(D_ERR, "Unknown packet received");
133 }
134 break;
135
136 case -ENOENT:
137 case -ECONNRESET:
138 case -ENODEV:
139 case -ESHUTDOWN:
140 /* Stop is requested either by software or hardware is gone,
141 * keep the ret value non-zero and don't resubmit later.
142 */
143 break;
144
145 default:
146 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
147 urb->status = 0;
148 ret = 0;
149 }
150
151 if (ret == 0) {
152 ret = usb_submit_urb(urb, GFP_ATOMIC);
153 if (ret < 0)
154 pr_err("Resubmit URB failed with error %i\n", ret);
155 }
156 }
157
158 static int gspca_input_connect(struct gspca_dev *dev)
159 {
160 struct input_dev *input_dev;
161 int err = 0;
162
163 dev->input_dev = NULL;
164 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
165 input_dev = input_allocate_device();
166 if (!input_dev)
167 return -ENOMEM;
168
169 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
170 strlcat(dev->phys, "/input0", sizeof(dev->phys));
171
172 input_dev->name = dev->sd_desc->name;
173 input_dev->phys = dev->phys;
174
175 usb_to_input_id(dev->dev, &input_dev->id);
176
177 input_dev->evbit[0] = BIT_MASK(EV_KEY);
178 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
179 input_dev->dev.parent = &dev->dev->dev;
180
181 err = input_register_device(input_dev);
182 if (err) {
183 pr_err("Input device registration failed with error %i\n",
184 err);
185 input_dev->dev.parent = NULL;
186 input_free_device(input_dev);
187 } else {
188 dev->input_dev = input_dev;
189 }
190 }
191
192 return err;
193 }
194
195 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
196 struct usb_endpoint_descriptor *ep)
197 {
198 unsigned int buffer_len;
199 int interval;
200 struct urb *urb;
201 struct usb_device *dev;
202 void *buffer = NULL;
203 int ret = -EINVAL;
204
205 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
206 interval = ep->bInterval;
207 PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
208 "buffer_len=%u, interval=%u",
209 ep->bEndpointAddress, buffer_len, interval);
210
211 dev = gspca_dev->dev;
212
213 urb = usb_alloc_urb(0, GFP_KERNEL);
214 if (!urb) {
215 ret = -ENOMEM;
216 goto error;
217 }
218
219 buffer = usb_alloc_coherent(dev, buffer_len,
220 GFP_KERNEL, &urb->transfer_dma);
221 if (!buffer) {
222 ret = -ENOMEM;
223 goto error_buffer;
224 }
225 usb_fill_int_urb(urb, dev,
226 usb_rcvintpipe(dev, ep->bEndpointAddress),
227 buffer, buffer_len,
228 int_irq, (void *)gspca_dev, interval);
229 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
230 ret = usb_submit_urb(urb, GFP_KERNEL);
231 if (ret < 0) {
232 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
233 goto error_submit;
234 }
235 gspca_dev->int_urb = urb;
236 return ret;
237
238 error_submit:
239 usb_free_coherent(dev,
240 urb->transfer_buffer_length,
241 urb->transfer_buffer,
242 urb->transfer_dma);
243 error_buffer:
244 usb_free_urb(urb);
245 error:
246 return ret;
247 }
248
249 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
250 {
251 struct usb_interface *intf;
252 struct usb_host_interface *intf_desc;
253 struct usb_endpoint_descriptor *ep;
254 int i;
255
256 if (gspca_dev->sd_desc->int_pkt_scan) {
257 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
258 intf_desc = intf->cur_altsetting;
259 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
260 ep = &intf_desc->endpoint[i].desc;
261 if (usb_endpoint_dir_in(ep) &&
262 usb_endpoint_xfer_int(ep)) {
263
264 alloc_and_submit_int_urb(gspca_dev, ep);
265 break;
266 }
267 }
268 }
269 }
270
271 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
272 {
273 struct urb *urb;
274
275 urb = gspca_dev->int_urb;
276 if (urb) {
277 gspca_dev->int_urb = NULL;
278 usb_kill_urb(urb);
279 usb_free_coherent(gspca_dev->dev,
280 urb->transfer_buffer_length,
281 urb->transfer_buffer,
282 urb->transfer_dma);
283 usb_free_urb(urb);
284 }
285 }
286 #else
287 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
288 {
289 }
290
291 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
292 {
293 }
294
295 static inline int gspca_input_connect(struct gspca_dev *dev)
296 {
297 return 0;
298 }
299 #endif
300
301 /*
302 * fill a video frame from an URB and resubmit
303 */
304 static void fill_frame(struct gspca_dev *gspca_dev,
305 struct urb *urb)
306 {
307 u8 *data; /* address of data in the iso message */
308 int i, len, st;
309 cam_pkt_op pkt_scan;
310
311 if (urb->status != 0) {
312 if (urb->status == -ESHUTDOWN)
313 return; /* disconnection */
314 #ifdef CONFIG_PM
315 if (gspca_dev->frozen)
316 return;
317 #endif
318 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
319 urb->status = 0;
320 goto resubmit;
321 }
322 pkt_scan = gspca_dev->sd_desc->pkt_scan;
323 for (i = 0; i < urb->number_of_packets; i++) {
324 len = urb->iso_frame_desc[i].actual_length;
325
326 /* check the packet status and length */
327 st = urb->iso_frame_desc[i].status;
328 if (st) {
329 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
330 i, len, st);
331 gspca_dev->last_packet_type = DISCARD_PACKET;
332 continue;
333 }
334 if (len == 0) {
335 if (gspca_dev->empty_packet == 0)
336 gspca_dev->empty_packet = 1;
337 continue;
338 }
339
340 /* let the packet be analyzed by the subdriver */
341 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
342 i, urb->iso_frame_desc[i].offset, len);
343 data = (u8 *) urb->transfer_buffer
344 + urb->iso_frame_desc[i].offset;
345 pkt_scan(gspca_dev, data, len);
346 }
347
348 resubmit:
349 /* resubmit the URB */
350 st = usb_submit_urb(urb, GFP_ATOMIC);
351 if (st < 0)
352 pr_err("usb_submit_urb() ret %d\n", st);
353 }
354
355 /*
356 * ISOC message interrupt from the USB device
357 *
358 * Analyse each packet and call the subdriver for copy to the frame buffer.
359 */
360 static void isoc_irq(struct urb *urb)
361 {
362 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
363
364 PDEBUG(D_PACK, "isoc irq");
365 if (!gspca_dev->streaming)
366 return;
367 fill_frame(gspca_dev, urb);
368 }
369
370 /*
371 * bulk message interrupt from the USB device
372 */
373 static void bulk_irq(struct urb *urb)
374 {
375 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
376 int st;
377
378 PDEBUG(D_PACK, "bulk irq");
379 if (!gspca_dev->streaming)
380 return;
381 switch (urb->status) {
382 case 0:
383 break;
384 case -ESHUTDOWN:
385 return; /* disconnection */
386 default:
387 #ifdef CONFIG_PM
388 if (gspca_dev->frozen)
389 return;
390 #endif
391 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
392 urb->status = 0;
393 goto resubmit;
394 }
395
396 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
397 gspca_dev->sd_desc->pkt_scan(gspca_dev,
398 urb->transfer_buffer,
399 urb->actual_length);
400
401 resubmit:
402 /* resubmit the URB */
403 if (gspca_dev->cam.bulk_nurbs != 0) {
404 st = usb_submit_urb(urb, GFP_ATOMIC);
405 if (st < 0)
406 pr_err("usb_submit_urb() ret %d\n", st);
407 }
408 }
409
410 /*
411 * add data to the current frame
412 *
413 * This function is called by the subdrivers at interrupt level.
414 *
415 * To build a frame, these ones must add
416 * - one FIRST_PACKET
417 * - 0 or many INTER_PACKETs
418 * - one LAST_PACKET
419 * DISCARD_PACKET invalidates the whole frame.
420 */
421 void gspca_frame_add(struct gspca_dev *gspca_dev,
422 enum gspca_packet_type packet_type,
423 const u8 *data,
424 int len)
425 {
426 struct gspca_frame *frame;
427 int i, j;
428
429 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
430
431 if (packet_type == FIRST_PACKET) {
432 i = atomic_read(&gspca_dev->fr_i);
433
434 /* if there are no queued buffer, discard the whole frame */
435 if (i == atomic_read(&gspca_dev->fr_q)) {
436 gspca_dev->last_packet_type = DISCARD_PACKET;
437 gspca_dev->sequence++;
438 return;
439 }
440 j = gspca_dev->fr_queue[i];
441 frame = &gspca_dev->frame[j];
442 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
443 frame->v4l2_buf.sequence = gspca_dev->sequence++;
444 gspca_dev->image = frame->data;
445 gspca_dev->image_len = 0;
446 } else {
447 switch (gspca_dev->last_packet_type) {
448 case DISCARD_PACKET:
449 if (packet_type == LAST_PACKET) {
450 gspca_dev->last_packet_type = packet_type;
451 gspca_dev->image = NULL;
452 gspca_dev->image_len = 0;
453 }
454 return;
455 case LAST_PACKET:
456 return;
457 }
458 }
459
460 /* append the packet to the frame buffer */
461 if (len > 0) {
462 if (gspca_dev->image_len + len > gspca_dev->frsz) {
463 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
464 gspca_dev->image_len + len,
465 gspca_dev->frsz);
466 packet_type = DISCARD_PACKET;
467 } else {
468 /* !! image is NULL only when last pkt is LAST or DISCARD
469 if (gspca_dev->image == NULL) {
470 pr_err("gspca_frame_add() image == NULL\n");
471 return;
472 }
473 */
474 memcpy(gspca_dev->image + gspca_dev->image_len,
475 data, len);
476 gspca_dev->image_len += len;
477 }
478 }
479 gspca_dev->last_packet_type = packet_type;
480
481 /* if last packet, invalidate packet concatenation until
482 * next first packet, wake up the application and advance
483 * in the queue */
484 if (packet_type == LAST_PACKET) {
485 i = atomic_read(&gspca_dev->fr_i);
486 j = gspca_dev->fr_queue[i];
487 frame = &gspca_dev->frame[j];
488 frame->v4l2_buf.bytesused = gspca_dev->image_len;
489 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
490 | V4L2_BUF_FLAG_DONE)
491 & ~V4L2_BUF_FLAG_QUEUED;
492 i = (i + 1) % GSPCA_MAX_FRAMES;
493 atomic_set(&gspca_dev->fr_i, i);
494 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
495 PDEBUG(D_FRAM, "frame complete len:%d",
496 frame->v4l2_buf.bytesused);
497 gspca_dev->image = NULL;
498 gspca_dev->image_len = 0;
499 }
500 }
501 EXPORT_SYMBOL(gspca_frame_add);
502
503 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
504 enum v4l2_memory memory, unsigned int count)
505 {
506 struct gspca_frame *frame;
507 unsigned int frsz;
508 int i;
509
510 i = gspca_dev->curr_mode;
511 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
512 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
513 frsz = PAGE_ALIGN(frsz);
514 if (count >= GSPCA_MAX_FRAMES)
515 count = GSPCA_MAX_FRAMES - 1;
516 gspca_dev->frbuf = vmalloc_32(frsz * count);
517 if (!gspca_dev->frbuf) {
518 pr_err("frame alloc failed\n");
519 return -ENOMEM;
520 }
521 gspca_dev->capt_file = file;
522 gspca_dev->memory = memory;
523 gspca_dev->frsz = frsz;
524 gspca_dev->nframes = count;
525 for (i = 0; i < count; i++) {
526 frame = &gspca_dev->frame[i];
527 frame->v4l2_buf.index = i;
528 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
529 frame->v4l2_buf.flags = 0;
530 frame->v4l2_buf.field = V4L2_FIELD_NONE;
531 frame->v4l2_buf.length = frsz;
532 frame->v4l2_buf.memory = memory;
533 frame->v4l2_buf.sequence = 0;
534 frame->data = gspca_dev->frbuf + i * frsz;
535 frame->v4l2_buf.m.offset = i * frsz;
536 }
537 atomic_set(&gspca_dev->fr_q, 0);
538 atomic_set(&gspca_dev->fr_i, 0);
539 gspca_dev->fr_o = 0;
540 return 0;
541 }
542
543 static void frame_free(struct gspca_dev *gspca_dev)
544 {
545 int i;
546
547 PDEBUG(D_STREAM, "frame free");
548 if (gspca_dev->frbuf != NULL) {
549 vfree(gspca_dev->frbuf);
550 gspca_dev->frbuf = NULL;
551 for (i = 0; i < gspca_dev->nframes; i++)
552 gspca_dev->frame[i].data = NULL;
553 }
554 gspca_dev->nframes = 0;
555 gspca_dev->frsz = 0;
556 gspca_dev->capt_file = NULL;
557 gspca_dev->memory = GSPCA_MEMORY_NO;
558 }
559
560 static void destroy_urbs(struct gspca_dev *gspca_dev)
561 {
562 struct urb *urb;
563 unsigned int i;
564
565 PDEBUG(D_STREAM, "kill transfer");
566 for (i = 0; i < MAX_NURBS; i++) {
567 urb = gspca_dev->urb[i];
568 if (urb == NULL)
569 break;
570
571 gspca_dev->urb[i] = NULL;
572 usb_kill_urb(urb);
573 if (urb->transfer_buffer != NULL)
574 usb_free_coherent(gspca_dev->dev,
575 urb->transfer_buffer_length,
576 urb->transfer_buffer,
577 urb->transfer_dma);
578 usb_free_urb(urb);
579 }
580 }
581
582 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
583 {
584 int ret;
585
586 if (gspca_dev->alt == 0)
587 return 0;
588 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
589 if (ret < 0)
590 pr_err("set alt 0 err %d\n", ret);
591 return ret;
592 }
593
594 /* Note: both the queue and the usb locks should be held when calling this */
595 static void gspca_stream_off(struct gspca_dev *gspca_dev)
596 {
597 gspca_dev->streaming = 0;
598 gspca_dev->usb_err = 0;
599 if (gspca_dev->sd_desc->stopN)
600 gspca_dev->sd_desc->stopN(gspca_dev);
601 destroy_urbs(gspca_dev);
602 gspca_input_destroy_urb(gspca_dev);
603 gspca_set_alt0(gspca_dev);
604 gspca_input_create_urb(gspca_dev);
605 if (gspca_dev->sd_desc->stop0)
606 gspca_dev->sd_desc->stop0(gspca_dev);
607 PDEBUG(D_STREAM, "stream off OK");
608 }
609
610 /*
611 * look for an input transfer endpoint in an alternate setting
612 */
613 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
614 int xfer)
615 {
616 struct usb_host_endpoint *ep;
617 int i, attr;
618
619 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
620 ep = &alt->endpoint[i];
621 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
622 if (attr == xfer
623 && ep->desc.wMaxPacketSize != 0
624 && usb_endpoint_dir_in(&ep->desc))
625 return ep;
626 }
627 return NULL;
628 }
629
630 /* compute the minimum bandwidth for the current transfer */
631 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
632 {
633 u32 bandwidth;
634 int i;
635
636 /* get the (max) image size */
637 i = gspca_dev->curr_mode;
638 bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
639
640 /* if the image is compressed, estimate its mean size */
641 if (!gspca_dev->cam.needs_full_bandwidth &&
642 bandwidth < gspca_dev->cam.cam_mode[i].width *
643 gspca_dev->cam.cam_mode[i].height)
644 bandwidth = bandwidth * 3 / 8; /* 0.375 */
645
646 /* estimate the frame rate */
647 if (gspca_dev->sd_desc->get_streamparm) {
648 struct v4l2_streamparm parm;
649
650 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
651 bandwidth *= parm.parm.capture.timeperframe.denominator;
652 bandwidth /= parm.parm.capture.timeperframe.numerator;
653 } else {
654
655 /* don't hope more than 15 fps with USB 1.1 and
656 * image resolution >= 640x480 */
657 if (gspca_dev->width >= 640
658 && gspca_dev->dev->speed == USB_SPEED_FULL)
659 bandwidth *= 15; /* 15 fps */
660 else
661 bandwidth *= 30; /* 30 fps */
662 }
663
664 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
665 return bandwidth;
666 }
667
668 /* endpoint table */
669 #define MAX_ALT 16
670 struct ep_tb_s {
671 u32 alt;
672 u32 bandwidth;
673 };
674
675 /*
676 * build the table of the endpoints
677 * and compute the minimum bandwidth for the image transfer
678 */
679 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
680 struct usb_interface *intf,
681 struct ep_tb_s *ep_tb)
682 {
683 struct usb_host_endpoint *ep;
684 int i, j, nbalt, psize, found;
685 u32 bandwidth, last_bw;
686
687 nbalt = intf->num_altsetting;
688 if (nbalt > MAX_ALT)
689 nbalt = MAX_ALT; /* fixme: should warn */
690
691 /* build the endpoint table */
692 i = 0;
693 last_bw = 0;
694 for (;;) {
695 ep_tb->bandwidth = 2000 * 2000 * 120;
696 found = 0;
697 for (j = 0; j < nbalt; j++) {
698 ep = alt_xfer(&intf->altsetting[j],
699 USB_ENDPOINT_XFER_ISOC);
700 if (ep == NULL)
701 continue;
702 if (ep->desc.bInterval == 0) {
703 pr_err("alt %d iso endp with 0 interval\n", j);
704 continue;
705 }
706 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
707 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
708 bandwidth = psize * 1000;
709 if (gspca_dev->dev->speed == USB_SPEED_HIGH
710 || gspca_dev->dev->speed == USB_SPEED_SUPER)
711 bandwidth *= 8;
712 bandwidth /= 1 << (ep->desc.bInterval - 1);
713 if (bandwidth <= last_bw)
714 continue;
715 if (bandwidth < ep_tb->bandwidth) {
716 ep_tb->bandwidth = bandwidth;
717 ep_tb->alt = j;
718 found = 1;
719 }
720 }
721 if (!found)
722 break;
723 PDEBUG(D_STREAM, "alt %d bandwidth %d",
724 ep_tb->alt, ep_tb->bandwidth);
725 last_bw = ep_tb->bandwidth;
726 i++;
727 ep_tb++;
728 }
729
730 /*
731 * If the camera:
732 * has a usb audio class interface (a built in usb mic); and
733 * is a usb 1 full speed device; and
734 * uses the max full speed iso bandwidth; and
735 * and has more than 1 alt setting
736 * then skip the highest alt setting to spare bandwidth for the mic
737 */
738 if (gspca_dev->audio &&
739 gspca_dev->dev->speed == USB_SPEED_FULL &&
740 last_bw >= 1000000 &&
741 i > 1) {
742 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
743 i--;
744 ep_tb--;
745 }
746
747 /* get the requested bandwidth and start at the highest atlsetting */
748 bandwidth = which_bandwidth(gspca_dev);
749 ep_tb--;
750 while (i > 1) {
751 ep_tb--;
752 if (ep_tb->bandwidth < bandwidth)
753 break;
754 i--;
755 }
756 return i;
757 }
758
759 /*
760 * create the URBs for image transfer
761 */
762 static int create_urbs(struct gspca_dev *gspca_dev,
763 struct usb_host_endpoint *ep)
764 {
765 struct urb *urb;
766 int n, nurbs, i, psize, npkt, bsize;
767
768 /* calculate the packet size and the number of packets */
769 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
770
771 if (!gspca_dev->cam.bulk) { /* isoc */
772
773 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
774 if (gspca_dev->pkt_size == 0)
775 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
776 else
777 psize = gspca_dev->pkt_size;
778 npkt = gspca_dev->cam.npkt;
779 if (npkt == 0)
780 npkt = 32; /* default value */
781 bsize = psize * npkt;
782 PDEBUG(D_STREAM,
783 "isoc %d pkts size %d = bsize:%d",
784 npkt, psize, bsize);
785 nurbs = DEF_NURBS;
786 } else { /* bulk */
787 npkt = 0;
788 bsize = gspca_dev->cam.bulk_size;
789 if (bsize == 0)
790 bsize = psize;
791 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
792 if (gspca_dev->cam.bulk_nurbs != 0)
793 nurbs = gspca_dev->cam.bulk_nurbs;
794 else
795 nurbs = 1;
796 }
797
798 for (n = 0; n < nurbs; n++) {
799 urb = usb_alloc_urb(npkt, GFP_KERNEL);
800 if (!urb) {
801 pr_err("usb_alloc_urb failed\n");
802 return -ENOMEM;
803 }
804 gspca_dev->urb[n] = urb;
805 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
806 bsize,
807 GFP_KERNEL,
808 &urb->transfer_dma);
809
810 if (urb->transfer_buffer == NULL) {
811 pr_err("usb_alloc_coherent failed\n");
812 return -ENOMEM;
813 }
814 urb->dev = gspca_dev->dev;
815 urb->context = gspca_dev;
816 urb->transfer_buffer_length = bsize;
817 if (npkt != 0) { /* ISOC */
818 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
819 ep->desc.bEndpointAddress);
820 urb->transfer_flags = URB_ISO_ASAP
821 | URB_NO_TRANSFER_DMA_MAP;
822 urb->interval = 1 << (ep->desc.bInterval - 1);
823 urb->complete = isoc_irq;
824 urb->number_of_packets = npkt;
825 for (i = 0; i < npkt; i++) {
826 urb->iso_frame_desc[i].length = psize;
827 urb->iso_frame_desc[i].offset = psize * i;
828 }
829 } else { /* bulk */
830 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
831 ep->desc.bEndpointAddress);
832 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
833 urb->complete = bulk_irq;
834 }
835 }
836 return 0;
837 }
838
839 /*
840 * start the USB transfer
841 */
842 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
843 {
844 struct usb_interface *intf;
845 struct usb_host_endpoint *ep;
846 struct urb *urb;
847 struct ep_tb_s ep_tb[MAX_ALT];
848 int n, ret, xfer, alt, alt_idx;
849
850 /* reset the streaming variables */
851 gspca_dev->image = NULL;
852 gspca_dev->image_len = 0;
853 gspca_dev->last_packet_type = DISCARD_PACKET;
854 gspca_dev->sequence = 0;
855
856 gspca_dev->usb_err = 0;
857
858 /* do the specific subdriver stuff before endpoint selection */
859 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
860 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
861 if (gspca_dev->sd_desc->isoc_init) {
862 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
863 if (ret < 0)
864 return ret;
865 }
866 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
867 : USB_ENDPOINT_XFER_ISOC;
868
869 /* if bulk or the subdriver forced an altsetting, get the endpoint */
870 if (gspca_dev->alt != 0) {
871 gspca_dev->alt--; /* (previous version compatibility) */
872 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
873 if (ep == NULL) {
874 pr_err("bad altsetting %d\n", gspca_dev->alt);
875 return -EIO;
876 }
877 ep_tb[0].alt = gspca_dev->alt;
878 alt_idx = 1;
879 } else {
880
881 /* else, compute the minimum bandwidth
882 * and build the endpoint table */
883 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
884 if (alt_idx <= 0) {
885 pr_err("no transfer endpoint found\n");
886 return -EIO;
887 }
888 }
889
890 /* set the highest alternate setting and
891 * loop until urb submit succeeds */
892 gspca_input_destroy_urb(gspca_dev);
893
894 gspca_dev->alt = ep_tb[--alt_idx].alt;
895 alt = -1;
896 for (;;) {
897 if (alt != gspca_dev->alt) {
898 alt = gspca_dev->alt;
899 if (intf->num_altsetting > 1) {
900 ret = usb_set_interface(gspca_dev->dev,
901 gspca_dev->iface,
902 alt);
903 if (ret < 0) {
904 if (ret == -ENOSPC)
905 goto retry; /*fixme: ugly*/
906 pr_err("set alt %d err %d\n", alt, ret);
907 goto out;
908 }
909 }
910 }
911 if (!gspca_dev->cam.no_urb_create) {
912 PDEBUG(D_STREAM, "init transfer alt %d", alt);
913 ret = create_urbs(gspca_dev,
914 alt_xfer(&intf->altsetting[alt], xfer));
915 if (ret < 0) {
916 destroy_urbs(gspca_dev);
917 goto out;
918 }
919 }
920
921 /* clear the bulk endpoint */
922 if (gspca_dev->cam.bulk)
923 usb_clear_halt(gspca_dev->dev,
924 gspca_dev->urb[0]->pipe);
925
926 /* start the cam */
927 ret = gspca_dev->sd_desc->start(gspca_dev);
928 if (ret < 0) {
929 destroy_urbs(gspca_dev);
930 goto out;
931 }
932 gspca_dev->streaming = 1;
933
934 /* some bulk transfers are started by the subdriver */
935 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
936 break;
937
938 /* submit the URBs */
939 for (n = 0; n < MAX_NURBS; n++) {
940 urb = gspca_dev->urb[n];
941 if (urb == NULL)
942 break;
943 ret = usb_submit_urb(urb, GFP_KERNEL);
944 if (ret < 0)
945 break;
946 }
947 if (ret >= 0)
948 break; /* transfer is started */
949
950 /* something when wrong
951 * stop the webcam and free the transfer resources */
952 gspca_stream_off(gspca_dev);
953 if (ret != -ENOSPC) {
954 pr_err("usb_submit_urb alt %d err %d\n",
955 gspca_dev->alt, ret);
956 goto out;
957 }
958
959 /* the bandwidth is not wide enough
960 * negotiate or try a lower alternate setting */
961 retry:
962 PDEBUG(D_ERR|D_STREAM,
963 "alt %d - bandwidth not wide enough - trying again",
964 alt);
965 msleep(20); /* wait for kill complete */
966 if (gspca_dev->sd_desc->isoc_nego) {
967 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
968 if (ret < 0)
969 goto out;
970 } else {
971 if (alt_idx <= 0) {
972 pr_err("no transfer endpoint found\n");
973 ret = -EIO;
974 goto out;
975 }
976 gspca_dev->alt = ep_tb[--alt_idx].alt;
977 }
978 }
979 out:
980 gspca_input_create_urb(gspca_dev);
981 return ret;
982 }
983
984 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
985 {
986 struct gspca_ctrl *ctrl;
987 int i;
988
989 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
990 gspca_dev->curr_mode = i;
991 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
992 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
993 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
994
995 /* set the current control values to their default values
996 * which may have changed in sd_init() */
997 /* does nothing if ctrl_handler == NULL */
998 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
999 ctrl = gspca_dev->cam.ctrls;
1000 if (ctrl != NULL) {
1001 for (i = 0;
1002 i < gspca_dev->sd_desc->nctrls;
1003 i++, ctrl++)
1004 ctrl->val = ctrl->def;
1005 }
1006 }
1007
1008 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1009 int width, int height)
1010 {
1011 int i;
1012
1013 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1014 if (width >= gspca_dev->cam.cam_mode[i].width
1015 && height >= gspca_dev->cam.cam_mode[i].height)
1016 break;
1017 }
1018 return i;
1019 }
1020
1021 /*
1022 * search a mode with the right pixel format
1023 */
1024 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1025 int mode,
1026 int pixfmt)
1027 {
1028 int modeU, modeD;
1029
1030 modeU = modeD = mode;
1031 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1032 if (--modeD >= 0) {
1033 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1034 == pixfmt)
1035 return modeD;
1036 }
1037 if (++modeU < gspca_dev->cam.nmodes) {
1038 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1039 == pixfmt)
1040 return modeU;
1041 }
1042 }
1043 return -EINVAL;
1044 }
1045
1046 #ifdef CONFIG_VIDEO_ADV_DEBUG
1047 static int vidioc_g_register(struct file *file, void *priv,
1048 struct v4l2_dbg_register *reg)
1049 {
1050 struct gspca_dev *gspca_dev = video_drvdata(file);
1051
1052 if (!gspca_dev->sd_desc->get_chip_ident)
1053 return -ENOTTY;
1054
1055 if (!gspca_dev->sd_desc->get_register)
1056 return -ENOTTY;
1057
1058 gspca_dev->usb_err = 0;
1059 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1060 }
1061
1062 static int vidioc_s_register(struct file *file, void *priv,
1063 struct v4l2_dbg_register *reg)
1064 {
1065 struct gspca_dev *gspca_dev = video_drvdata(file);
1066
1067 if (!gspca_dev->sd_desc->get_chip_ident)
1068 return -ENOTTY;
1069
1070 if (!gspca_dev->sd_desc->set_register)
1071 return -ENOTTY;
1072
1073 gspca_dev->usb_err = 0;
1074 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1075 }
1076 #endif
1077
1078 static int vidioc_g_chip_ident(struct file *file, void *priv,
1079 struct v4l2_dbg_chip_ident *chip)
1080 {
1081 struct gspca_dev *gspca_dev = video_drvdata(file);
1082
1083 if (!gspca_dev->sd_desc->get_chip_ident)
1084 return -ENOTTY;
1085
1086 gspca_dev->usb_err = 0;
1087 return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1088 }
1089
1090 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1091 struct v4l2_fmtdesc *fmtdesc)
1092 {
1093 struct gspca_dev *gspca_dev = video_drvdata(file);
1094 int i, j, index;
1095 __u32 fmt_tb[8];
1096
1097 /* give an index to each format */
1098 index = 0;
1099 j = 0;
1100 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1101 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1102 j = 0;
1103 for (;;) {
1104 if (fmt_tb[j] == fmt_tb[index])
1105 break;
1106 j++;
1107 }
1108 if (j == index) {
1109 if (fmtdesc->index == index)
1110 break; /* new format */
1111 index++;
1112 if (index >= ARRAY_SIZE(fmt_tb))
1113 return -EINVAL;
1114 }
1115 }
1116 if (i < 0)
1117 return -EINVAL; /* no more format */
1118
1119 fmtdesc->pixelformat = fmt_tb[index];
1120 if (gspca_dev->cam.cam_mode[i].sizeimage <
1121 gspca_dev->cam.cam_mode[i].width *
1122 gspca_dev->cam.cam_mode[i].height)
1123 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1124 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1125 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1126 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1127 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1128 fmtdesc->description[4] = '\0';
1129 return 0;
1130 }
1131
1132 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1133 struct v4l2_format *fmt)
1134 {
1135 struct gspca_dev *gspca_dev = video_drvdata(file);
1136 int mode;
1137
1138 mode = gspca_dev->curr_mode;
1139 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1140 sizeof fmt->fmt.pix);
1141 return 0;
1142 }
1143
1144 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1145 struct v4l2_format *fmt)
1146 {
1147 int w, h, mode, mode2;
1148
1149 w = fmt->fmt.pix.width;
1150 h = fmt->fmt.pix.height;
1151
1152 #ifdef GSPCA_DEBUG
1153 if (gspca_debug & D_CONF)
1154 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1155 #endif
1156 /* search the closest mode for width and height */
1157 mode = wxh_to_mode(gspca_dev, w, h);
1158
1159 /* OK if right palette */
1160 if (gspca_dev->cam.cam_mode[mode].pixelformat
1161 != fmt->fmt.pix.pixelformat) {
1162
1163 /* else, search the closest mode with the same pixel format */
1164 mode2 = gspca_get_mode(gspca_dev, mode,
1165 fmt->fmt.pix.pixelformat);
1166 if (mode2 >= 0)
1167 mode = mode2;
1168 /* else
1169 ; * no chance, return this mode */
1170 }
1171 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1172 sizeof fmt->fmt.pix);
1173 return mode; /* used when s_fmt */
1174 }
1175
1176 static int vidioc_try_fmt_vid_cap(struct file *file,
1177 void *priv,
1178 struct v4l2_format *fmt)
1179 {
1180 struct gspca_dev *gspca_dev = video_drvdata(file);
1181 int ret;
1182
1183 ret = try_fmt_vid_cap(gspca_dev, fmt);
1184 if (ret < 0)
1185 return ret;
1186 return 0;
1187 }
1188
1189 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1190 struct v4l2_format *fmt)
1191 {
1192 struct gspca_dev *gspca_dev = video_drvdata(file);
1193 int ret;
1194
1195 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1196 return -ERESTARTSYS;
1197
1198 ret = try_fmt_vid_cap(gspca_dev, fmt);
1199 if (ret < 0)
1200 goto out;
1201
1202 if (gspca_dev->nframes != 0
1203 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1204 ret = -EINVAL;
1205 goto out;
1206 }
1207
1208 if (ret == gspca_dev->curr_mode) {
1209 ret = 0;
1210 goto out; /* same mode */
1211 }
1212
1213 if (gspca_dev->streaming) {
1214 ret = -EBUSY;
1215 goto out;
1216 }
1217 gspca_dev->width = fmt->fmt.pix.width;
1218 gspca_dev->height = fmt->fmt.pix.height;
1219 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1220 gspca_dev->curr_mode = ret;
1221
1222 ret = 0;
1223 out:
1224 mutex_unlock(&gspca_dev->queue_lock);
1225 return ret;
1226 }
1227
1228 static int vidioc_enum_framesizes(struct file *file, void *priv,
1229 struct v4l2_frmsizeenum *fsize)
1230 {
1231 struct gspca_dev *gspca_dev = video_drvdata(file);
1232 int i;
1233 __u32 index = 0;
1234
1235 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1236 if (fsize->pixel_format !=
1237 gspca_dev->cam.cam_mode[i].pixelformat)
1238 continue;
1239
1240 if (fsize->index == index) {
1241 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1242 fsize->discrete.width =
1243 gspca_dev->cam.cam_mode[i].width;
1244 fsize->discrete.height =
1245 gspca_dev->cam.cam_mode[i].height;
1246 return 0;
1247 }
1248 index++;
1249 }
1250
1251 return -EINVAL;
1252 }
1253
1254 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1255 struct v4l2_frmivalenum *fival)
1256 {
1257 struct gspca_dev *gspca_dev = video_drvdata(filp);
1258 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1259 __u32 i;
1260
1261 if (gspca_dev->cam.mode_framerates == NULL ||
1262 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1263 return -EINVAL;
1264
1265 if (fival->pixel_format !=
1266 gspca_dev->cam.cam_mode[mode].pixelformat)
1267 return -EINVAL;
1268
1269 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1270 if (fival->index == i) {
1271 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1272 fival->discrete.numerator = 1;
1273 fival->discrete.denominator =
1274 gspca_dev->cam.mode_framerates[mode].rates[i];
1275 return 0;
1276 }
1277 }
1278
1279 return -EINVAL;
1280 }
1281
1282 static void gspca_release(struct v4l2_device *v4l2_device)
1283 {
1284 struct gspca_dev *gspca_dev =
1285 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1286
1287 PDEBUG(D_PROBE, "%s released",
1288 video_device_node_name(&gspca_dev->vdev));
1289
1290 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1291 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1292 kfree(gspca_dev->usb_buf);
1293 kfree(gspca_dev);
1294 }
1295
1296 static int dev_open(struct file *file)
1297 {
1298 struct gspca_dev *gspca_dev = video_drvdata(file);
1299
1300 PDEBUG(D_STREAM, "[%s] open", current->comm);
1301
1302 /* protect the subdriver against rmmod */
1303 if (!try_module_get(gspca_dev->module))
1304 return -ENODEV;
1305
1306 #ifdef GSPCA_DEBUG
1307 /* activate the v4l2 debug */
1308 if (gspca_debug & D_V4L2)
1309 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1310 | V4L2_DEBUG_IOCTL_ARG;
1311 else
1312 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1313 | V4L2_DEBUG_IOCTL_ARG);
1314 #endif
1315 return v4l2_fh_open(file);
1316 }
1317
1318 static int dev_close(struct file *file)
1319 {
1320 struct gspca_dev *gspca_dev = video_drvdata(file);
1321
1322 PDEBUG(D_STREAM, "[%s] close", current->comm);
1323
1324 /* Needed for gspca_stream_off, always lock before queue_lock! */
1325 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1326 return -ERESTARTSYS;
1327
1328 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1329 mutex_unlock(&gspca_dev->usb_lock);
1330 return -ERESTARTSYS;
1331 }
1332
1333 /* if the file did the capture, free the streaming resources */
1334 if (gspca_dev->capt_file == file) {
1335 if (gspca_dev->streaming)
1336 gspca_stream_off(gspca_dev);
1337 frame_free(gspca_dev);
1338 }
1339 module_put(gspca_dev->module);
1340 mutex_unlock(&gspca_dev->queue_lock);
1341 mutex_unlock(&gspca_dev->usb_lock);
1342
1343 PDEBUG(D_STREAM, "close done");
1344
1345 return v4l2_fh_release(file);
1346 }
1347
1348 static int vidioc_querycap(struct file *file, void *priv,
1349 struct v4l2_capability *cap)
1350 {
1351 struct gspca_dev *gspca_dev = video_drvdata(file);
1352
1353 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1354 sizeof cap->driver);
1355 if (gspca_dev->dev->product != NULL) {
1356 strlcpy((char *) cap->card, gspca_dev->dev->product,
1357 sizeof cap->card);
1358 } else {
1359 snprintf((char *) cap->card, sizeof cap->card,
1360 "USB Camera (%04x:%04x)",
1361 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1362 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1363 }
1364 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1365 sizeof(cap->bus_info));
1366 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1367 | V4L2_CAP_STREAMING
1368 | V4L2_CAP_READWRITE;
1369 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1370 return 0;
1371 }
1372
1373 static int get_ctrl(struct gspca_dev *gspca_dev,
1374 int id)
1375 {
1376 const struct ctrl *ctrls;
1377 int i;
1378
1379 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1380 i < gspca_dev->sd_desc->nctrls;
1381 i++, ctrls++) {
1382 if (gspca_dev->ctrl_dis & (1 << i))
1383 continue;
1384 if (id == ctrls->qctrl.id)
1385 return i;
1386 }
1387 return -1;
1388 }
1389
1390 static int vidioc_queryctrl(struct file *file, void *priv,
1391 struct v4l2_queryctrl *q_ctrl)
1392 {
1393 struct gspca_dev *gspca_dev = video_drvdata(file);
1394 const struct ctrl *ctrls;
1395 struct gspca_ctrl *gspca_ctrl;
1396 int i, idx;
1397 u32 id;
1398
1399 id = q_ctrl->id;
1400 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1401 id &= V4L2_CTRL_ID_MASK;
1402 id++;
1403 idx = -1;
1404 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1405 if (gspca_dev->ctrl_dis & (1 << i))
1406 continue;
1407 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1408 continue;
1409 if (idx >= 0
1410 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1411 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1412 continue;
1413 idx = i;
1414 }
1415 } else {
1416 idx = get_ctrl(gspca_dev, id);
1417 }
1418 if (idx < 0)
1419 return -EINVAL;
1420 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1421 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1422 if (gspca_dev->cam.ctrls != NULL) {
1423 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1424 q_ctrl->default_value = gspca_ctrl->def;
1425 q_ctrl->minimum = gspca_ctrl->min;
1426 q_ctrl->maximum = gspca_ctrl->max;
1427 }
1428 if (gspca_dev->ctrl_inac & (1 << idx))
1429 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1430 return 0;
1431 }
1432
1433 static int vidioc_s_ctrl(struct file *file, void *priv,
1434 struct v4l2_control *ctrl)
1435 {
1436 struct gspca_dev *gspca_dev = video_drvdata(file);
1437 const struct ctrl *ctrls;
1438 struct gspca_ctrl *gspca_ctrl;
1439 int idx;
1440
1441 idx = get_ctrl(gspca_dev, ctrl->id);
1442 if (idx < 0)
1443 return -EINVAL;
1444 if (gspca_dev->ctrl_inac & (1 << idx))
1445 return -EINVAL;
1446 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1447 if (gspca_dev->cam.ctrls != NULL) {
1448 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1449 if (ctrl->value < gspca_ctrl->min
1450 || ctrl->value > gspca_ctrl->max)
1451 return -ERANGE;
1452 } else {
1453 gspca_ctrl = NULL;
1454 if (ctrl->value < ctrls->qctrl.minimum
1455 || ctrl->value > ctrls->qctrl.maximum)
1456 return -ERANGE;
1457 }
1458 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1459 gspca_dev->usb_err = 0;
1460 if (ctrls->set != NULL)
1461 return ctrls->set(gspca_dev, ctrl->value);
1462 if (gspca_ctrl != NULL) {
1463 gspca_ctrl->val = ctrl->value;
1464 if (ctrls->set_control != NULL
1465 && gspca_dev->streaming)
1466 ctrls->set_control(gspca_dev);
1467 }
1468 return gspca_dev->usb_err;
1469 }
1470
1471 static int vidioc_g_ctrl(struct file *file, void *priv,
1472 struct v4l2_control *ctrl)
1473 {
1474 struct gspca_dev *gspca_dev = video_drvdata(file);
1475 const struct ctrl *ctrls;
1476 int idx;
1477
1478 idx = get_ctrl(gspca_dev, ctrl->id);
1479 if (idx < 0)
1480 return -EINVAL;
1481 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1482
1483 gspca_dev->usb_err = 0;
1484 if (ctrls->get != NULL)
1485 return ctrls->get(gspca_dev, &ctrl->value);
1486 if (gspca_dev->cam.ctrls != NULL)
1487 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1488 return 0;
1489 }
1490
1491 static int vidioc_querymenu(struct file *file, void *priv,
1492 struct v4l2_querymenu *qmenu)
1493 {
1494 struct gspca_dev *gspca_dev = video_drvdata(file);
1495
1496 if (!gspca_dev->sd_desc->querymenu)
1497 return -ENOTTY;
1498 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1499 }
1500
1501 static int vidioc_enum_input(struct file *file, void *priv,
1502 struct v4l2_input *input)
1503 {
1504 struct gspca_dev *gspca_dev = video_drvdata(file);
1505
1506 if (input->index != 0)
1507 return -EINVAL;
1508 input->type = V4L2_INPUT_TYPE_CAMERA;
1509 input->status = gspca_dev->cam.input_flags;
1510 strlcpy(input->name, gspca_dev->sd_desc->name,
1511 sizeof input->name);
1512 return 0;
1513 }
1514
1515 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1516 {
1517 *i = 0;
1518 return 0;
1519 }
1520
1521 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1522 {
1523 if (i > 0)
1524 return -EINVAL;
1525 return (0);
1526 }
1527
1528 static int vidioc_reqbufs(struct file *file, void *priv,
1529 struct v4l2_requestbuffers *rb)
1530 {
1531 struct gspca_dev *gspca_dev = video_drvdata(file);
1532 int i, ret = 0, streaming;
1533
1534 i = rb->memory; /* (avoid compilation warning) */
1535 switch (i) {
1536 case GSPCA_MEMORY_READ: /* (internal call) */
1537 case V4L2_MEMORY_MMAP:
1538 case V4L2_MEMORY_USERPTR:
1539 break;
1540 default:
1541 return -EINVAL;
1542 }
1543 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1544 return -ERESTARTSYS;
1545
1546 if (gspca_dev->memory != GSPCA_MEMORY_NO
1547 && gspca_dev->memory != GSPCA_MEMORY_READ
1548 && gspca_dev->memory != rb->memory) {
1549 ret = -EBUSY;
1550 goto out;
1551 }
1552
1553 /* only one file may do the capture */
1554 if (gspca_dev->capt_file != NULL
1555 && gspca_dev->capt_file != file) {
1556 ret = -EBUSY;
1557 goto out;
1558 }
1559
1560 /* if allocated, the buffers must not be mapped */
1561 for (i = 0; i < gspca_dev->nframes; i++) {
1562 if (gspca_dev->frame[i].vma_use_count) {
1563 ret = -EBUSY;
1564 goto out;
1565 }
1566 }
1567
1568 /* stop streaming */
1569 streaming = gspca_dev->streaming;
1570 if (streaming) {
1571 gspca_stream_off(gspca_dev);
1572
1573 /* Don't restart the stream when switching from read
1574 * to mmap mode */
1575 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1576 streaming = 0;
1577 }
1578
1579 /* free the previous allocated buffers, if any */
1580 if (gspca_dev->nframes != 0)
1581 frame_free(gspca_dev);
1582 if (rb->count == 0) /* unrequest */
1583 goto out;
1584 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1585 if (ret == 0) {
1586 rb->count = gspca_dev->nframes;
1587 if (streaming)
1588 ret = gspca_init_transfer(gspca_dev);
1589 }
1590 out:
1591 mutex_unlock(&gspca_dev->queue_lock);
1592 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1593 return ret;
1594 }
1595
1596 static int vidioc_querybuf(struct file *file, void *priv,
1597 struct v4l2_buffer *v4l2_buf)
1598 {
1599 struct gspca_dev *gspca_dev = video_drvdata(file);
1600 struct gspca_frame *frame;
1601
1602 if (v4l2_buf->index < 0
1603 || v4l2_buf->index >= gspca_dev->nframes)
1604 return -EINVAL;
1605
1606 frame = &gspca_dev->frame[v4l2_buf->index];
1607 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1608 return 0;
1609 }
1610
1611 static int vidioc_streamon(struct file *file, void *priv,
1612 enum v4l2_buf_type buf_type)
1613 {
1614 struct gspca_dev *gspca_dev = video_drvdata(file);
1615 int ret;
1616
1617 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1618 return -EINVAL;
1619 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1620 return -ERESTARTSYS;
1621
1622 /* check the capture file */
1623 if (gspca_dev->capt_file != file) {
1624 ret = -EBUSY;
1625 goto out;
1626 }
1627
1628 if (gspca_dev->nframes == 0
1629 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1630 ret = -EINVAL;
1631 goto out;
1632 }
1633 if (!gspca_dev->streaming) {
1634 ret = gspca_init_transfer(gspca_dev);
1635 if (ret < 0)
1636 goto out;
1637 }
1638 #ifdef GSPCA_DEBUG
1639 if (gspca_debug & D_STREAM) {
1640 PDEBUG_MODE("stream on OK",
1641 gspca_dev->pixfmt,
1642 gspca_dev->width,
1643 gspca_dev->height);
1644 }
1645 #endif
1646 ret = 0;
1647 out:
1648 mutex_unlock(&gspca_dev->queue_lock);
1649 return ret;
1650 }
1651
1652 static int vidioc_streamoff(struct file *file, void *priv,
1653 enum v4l2_buf_type buf_type)
1654 {
1655 struct gspca_dev *gspca_dev = video_drvdata(file);
1656 int i, ret;
1657
1658 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1659 return -EINVAL;
1660
1661 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1662 return -ERESTARTSYS;
1663
1664 if (!gspca_dev->streaming) {
1665 ret = 0;
1666 goto out;
1667 }
1668
1669 /* check the capture file */
1670 if (gspca_dev->capt_file != file) {
1671 ret = -EBUSY;
1672 goto out;
1673 }
1674
1675 /* stop streaming */
1676 gspca_stream_off(gspca_dev);
1677 /* In case another thread is waiting in dqbuf */
1678 wake_up_interruptible(&gspca_dev->wq);
1679
1680 /* empty the transfer queues */
1681 for (i = 0; i < gspca_dev->nframes; i++)
1682 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1683 atomic_set(&gspca_dev->fr_q, 0);
1684 atomic_set(&gspca_dev->fr_i, 0);
1685 gspca_dev->fr_o = 0;
1686 ret = 0;
1687 out:
1688 mutex_unlock(&gspca_dev->queue_lock);
1689 return ret;
1690 }
1691
1692 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1693 struct v4l2_jpegcompression *jpegcomp)
1694 {
1695 struct gspca_dev *gspca_dev = video_drvdata(file);
1696
1697 if (!gspca_dev->sd_desc->get_jcomp)
1698 return -ENOTTY;
1699 gspca_dev->usb_err = 0;
1700 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1701 }
1702
1703 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1704 struct v4l2_jpegcompression *jpegcomp)
1705 {
1706 struct gspca_dev *gspca_dev = video_drvdata(file);
1707
1708 if (!gspca_dev->sd_desc->set_jcomp)
1709 return -ENOTTY;
1710 gspca_dev->usb_err = 0;
1711 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1712 }
1713
1714 static int vidioc_g_parm(struct file *filp, void *priv,
1715 struct v4l2_streamparm *parm)
1716 {
1717 struct gspca_dev *gspca_dev = video_drvdata(filp);
1718
1719 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1720
1721 if (gspca_dev->sd_desc->get_streamparm) {
1722 gspca_dev->usb_err = 0;
1723 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1724 return gspca_dev->usb_err;
1725 }
1726 return 0;
1727 }
1728
1729 static int vidioc_s_parm(struct file *filp, void *priv,
1730 struct v4l2_streamparm *parm)
1731 {
1732 struct gspca_dev *gspca_dev = video_drvdata(filp);
1733 int n;
1734
1735 n = parm->parm.capture.readbuffers;
1736 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1737 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1738 else
1739 gspca_dev->nbufread = n;
1740
1741 if (gspca_dev->sd_desc->set_streamparm) {
1742 gspca_dev->usb_err = 0;
1743 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1744 return gspca_dev->usb_err;
1745 }
1746
1747 return 0;
1748 }
1749
1750 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1751 {
1752 struct gspca_dev *gspca_dev = video_drvdata(file);
1753 struct gspca_frame *frame;
1754 struct page *page;
1755 unsigned long addr, start, size;
1756 int i, ret;
1757
1758 start = vma->vm_start;
1759 size = vma->vm_end - vma->vm_start;
1760 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1761
1762 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1763 return -ERESTARTSYS;
1764 if (gspca_dev->capt_file != file) {
1765 ret = -EINVAL;
1766 goto out;
1767 }
1768
1769 frame = NULL;
1770 for (i = 0; i < gspca_dev->nframes; ++i) {
1771 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1772 PDEBUG(D_STREAM, "mmap bad memory type");
1773 break;
1774 }
1775 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1776 == vma->vm_pgoff) {
1777 frame = &gspca_dev->frame[i];
1778 break;
1779 }
1780 }
1781 if (frame == NULL) {
1782 PDEBUG(D_STREAM, "mmap no frame buffer found");
1783 ret = -EINVAL;
1784 goto out;
1785 }
1786 if (size != frame->v4l2_buf.length) {
1787 PDEBUG(D_STREAM, "mmap bad size");
1788 ret = -EINVAL;
1789 goto out;
1790 }
1791
1792 /*
1793 * - VM_IO marks the area as being a mmaped region for I/O to a
1794 * device. It also prevents the region from being core dumped.
1795 */
1796 vma->vm_flags |= VM_IO;
1797
1798 addr = (unsigned long) frame->data;
1799 while (size > 0) {
1800 page = vmalloc_to_page((void *) addr);
1801 ret = vm_insert_page(vma, start, page);
1802 if (ret < 0)
1803 goto out;
1804 start += PAGE_SIZE;
1805 addr += PAGE_SIZE;
1806 size -= PAGE_SIZE;
1807 }
1808
1809 vma->vm_ops = &gspca_vm_ops;
1810 vma->vm_private_data = frame;
1811 gspca_vm_open(vma);
1812 ret = 0;
1813 out:
1814 mutex_unlock(&gspca_dev->queue_lock);
1815 return ret;
1816 }
1817
1818 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1819 enum v4l2_memory memory)
1820 {
1821 if (!gspca_dev->present)
1822 return -ENODEV;
1823 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1824 !gspca_dev->streaming)
1825 return -EINVAL;
1826
1827 /* check if a frame is ready */
1828 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1829 }
1830
1831 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1832 enum v4l2_memory memory)
1833 {
1834 int ret;
1835
1836 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1837 return -ERESTARTSYS;
1838 ret = frame_ready_nolock(gspca_dev, file, memory);
1839 mutex_unlock(&gspca_dev->queue_lock);
1840 return ret;
1841 }
1842
1843 /*
1844 * dequeue a video buffer
1845 *
1846 * If nonblock_ing is false, block until a buffer is available.
1847 */
1848 static int vidioc_dqbuf(struct file *file, void *priv,
1849 struct v4l2_buffer *v4l2_buf)
1850 {
1851 struct gspca_dev *gspca_dev = video_drvdata(file);
1852 struct gspca_frame *frame;
1853 int i, j, ret;
1854
1855 PDEBUG(D_FRAM, "dqbuf");
1856
1857 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1858 return -ERESTARTSYS;
1859
1860 for (;;) {
1861 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1862 if (ret < 0)
1863 goto out;
1864 if (ret > 0)
1865 break;
1866
1867 mutex_unlock(&gspca_dev->queue_lock);
1868
1869 if (file->f_flags & O_NONBLOCK)
1870 return -EAGAIN;
1871
1872 /* wait till a frame is ready */
1873 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1874 frame_ready(gspca_dev, file, v4l2_buf->memory),
1875 msecs_to_jiffies(3000));
1876 if (ret < 0)
1877 return ret;
1878 if (ret == 0)
1879 return -EIO;
1880
1881 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1882 return -ERESTARTSYS;
1883 }
1884
1885 i = gspca_dev->fr_o;
1886 j = gspca_dev->fr_queue[i];
1887 frame = &gspca_dev->frame[j];
1888
1889 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1890
1891 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1892 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1893 PDEBUG(D_FRAM, "dqbuf %d", j);
1894 ret = 0;
1895
1896 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1897 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1898 frame->data,
1899 frame->v4l2_buf.bytesused)) {
1900 PDEBUG(D_ERR|D_STREAM,
1901 "dqbuf cp to user failed");
1902 ret = -EFAULT;
1903 }
1904 }
1905 out:
1906 mutex_unlock(&gspca_dev->queue_lock);
1907
1908 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1909 mutex_lock(&gspca_dev->usb_lock);
1910 gspca_dev->usb_err = 0;
1911 if (gspca_dev->present)
1912 gspca_dev->sd_desc->dq_callback(gspca_dev);
1913 mutex_unlock(&gspca_dev->usb_lock);
1914 }
1915
1916 return ret;
1917 }
1918
1919 /*
1920 * queue a video buffer
1921 *
1922 * Attempting to queue a buffer that has already been
1923 * queued will return -EINVAL.
1924 */
1925 static int vidioc_qbuf(struct file *file, void *priv,
1926 struct v4l2_buffer *v4l2_buf)
1927 {
1928 struct gspca_dev *gspca_dev = video_drvdata(file);
1929 struct gspca_frame *frame;
1930 int i, index, ret;
1931
1932 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1933
1934 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1935 return -ERESTARTSYS;
1936
1937 index = v4l2_buf->index;
1938 if ((unsigned) index >= gspca_dev->nframes) {
1939 PDEBUG(D_FRAM,
1940 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1941 ret = -EINVAL;
1942 goto out;
1943 }
1944 if (v4l2_buf->memory != gspca_dev->memory) {
1945 PDEBUG(D_FRAM, "qbuf bad memory type");
1946 ret = -EINVAL;
1947 goto out;
1948 }
1949
1950 frame = &gspca_dev->frame[index];
1951 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1952 PDEBUG(D_FRAM, "qbuf bad state");
1953 ret = -EINVAL;
1954 goto out;
1955 }
1956
1957 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1958
1959 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1960 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1961 frame->v4l2_buf.length = v4l2_buf->length;
1962 }
1963
1964 /* put the buffer in the 'queued' queue */
1965 i = atomic_read(&gspca_dev->fr_q);
1966 gspca_dev->fr_queue[i] = index;
1967 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1968
1969 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1970 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1971 ret = 0;
1972 out:
1973 mutex_unlock(&gspca_dev->queue_lock);
1974 return ret;
1975 }
1976
1977 /*
1978 * allocate the resources for read()
1979 */
1980 static int read_alloc(struct gspca_dev *gspca_dev,
1981 struct file *file)
1982 {
1983 struct v4l2_buffer v4l2_buf;
1984 int i, ret;
1985
1986 PDEBUG(D_STREAM, "read alloc");
1987
1988 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1989 return -ERESTARTSYS;
1990
1991 if (gspca_dev->nframes == 0) {
1992 struct v4l2_requestbuffers rb;
1993
1994 memset(&rb, 0, sizeof rb);
1995 rb.count = gspca_dev->nbufread;
1996 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1997 rb.memory = GSPCA_MEMORY_READ;
1998 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1999 if (ret != 0) {
2000 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2001 goto out;
2002 }
2003 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2004 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2005 v4l2_buf.memory = GSPCA_MEMORY_READ;
2006 for (i = 0; i < gspca_dev->nbufread; i++) {
2007 v4l2_buf.index = i;
2008 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2009 if (ret != 0) {
2010 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2011 goto out;
2012 }
2013 }
2014 }
2015
2016 /* start streaming */
2017 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2018 if (ret != 0)
2019 PDEBUG(D_STREAM, "read streamon err %d", ret);
2020 out:
2021 mutex_unlock(&gspca_dev->usb_lock);
2022 return ret;
2023 }
2024
2025 static unsigned int dev_poll(struct file *file, poll_table *wait)
2026 {
2027 struct gspca_dev *gspca_dev = video_drvdata(file);
2028 unsigned long req_events = poll_requested_events(wait);
2029 int ret = 0;
2030
2031 PDEBUG(D_FRAM, "poll");
2032
2033 if (req_events & POLLPRI)
2034 ret |= v4l2_ctrl_poll(file, wait);
2035
2036 if (req_events & (POLLIN | POLLRDNORM)) {
2037 /* if reqbufs is not done, the user would use read() */
2038 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2039 if (read_alloc(gspca_dev, file) != 0) {
2040 ret |= POLLERR;
2041 goto out;
2042 }
2043 }
2044
2045 poll_wait(file, &gspca_dev->wq, wait);
2046
2047 /* check if an image has been received */
2048 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
2049 ret |= POLLERR;
2050 goto out;
2051 }
2052 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2053 ret |= POLLIN | POLLRDNORM;
2054 mutex_unlock(&gspca_dev->queue_lock);
2055 }
2056
2057 out:
2058 if (!gspca_dev->present)
2059 ret |= POLLHUP;
2060
2061 return ret;
2062 }
2063
2064 static ssize_t dev_read(struct file *file, char __user *data,
2065 size_t count, loff_t *ppos)
2066 {
2067 struct gspca_dev *gspca_dev = video_drvdata(file);
2068 struct gspca_frame *frame;
2069 struct v4l2_buffer v4l2_buf;
2070 struct timeval timestamp;
2071 int n, ret, ret2;
2072
2073 PDEBUG(D_FRAM, "read (%zd)", count);
2074 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2075 ret = read_alloc(gspca_dev, file);
2076 if (ret != 0)
2077 return ret;
2078 }
2079
2080 /* get a frame */
2081 timestamp = ktime_to_timeval(ktime_get());
2082 timestamp.tv_sec--;
2083 n = 2;
2084 for (;;) {
2085 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2086 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2087 v4l2_buf.memory = GSPCA_MEMORY_READ;
2088 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2089 if (ret != 0) {
2090 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2091 return ret;
2092 }
2093
2094 /* if the process slept for more than 1 second,
2095 * get a newer frame */
2096 frame = &gspca_dev->frame[v4l2_buf.index];
2097 if (--n < 0)
2098 break; /* avoid infinite loop */
2099 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2100 break;
2101 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2102 if (ret != 0) {
2103 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2104 return ret;
2105 }
2106 }
2107
2108 /* copy the frame */
2109 if (count > frame->v4l2_buf.bytesused)
2110 count = frame->v4l2_buf.bytesused;
2111 ret = copy_to_user(data, frame->data, count);
2112 if (ret != 0) {
2113 PDEBUG(D_ERR|D_STREAM,
2114 "read cp to user lack %d / %zd", ret, count);
2115 ret = -EFAULT;
2116 goto out;
2117 }
2118 ret = count;
2119 out:
2120 /* in each case, requeue the buffer */
2121 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2122 if (ret2 != 0)
2123 return ret2;
2124 return ret;
2125 }
2126
2127 static struct v4l2_file_operations dev_fops = {
2128 .owner = THIS_MODULE,
2129 .open = dev_open,
2130 .release = dev_close,
2131 .read = dev_read,
2132 .mmap = dev_mmap,
2133 .unlocked_ioctl = video_ioctl2,
2134 .poll = dev_poll,
2135 };
2136
2137 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2138 .vidioc_querycap = vidioc_querycap,
2139 .vidioc_dqbuf = vidioc_dqbuf,
2140 .vidioc_qbuf = vidioc_qbuf,
2141 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2142 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2143 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2144 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2145 .vidioc_streamon = vidioc_streamon,
2146 .vidioc_queryctrl = vidioc_queryctrl,
2147 .vidioc_g_ctrl = vidioc_g_ctrl,
2148 .vidioc_s_ctrl = vidioc_s_ctrl,
2149 .vidioc_querymenu = vidioc_querymenu,
2150 .vidioc_enum_input = vidioc_enum_input,
2151 .vidioc_g_input = vidioc_g_input,
2152 .vidioc_s_input = vidioc_s_input,
2153 .vidioc_reqbufs = vidioc_reqbufs,
2154 .vidioc_querybuf = vidioc_querybuf,
2155 .vidioc_streamoff = vidioc_streamoff,
2156 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2157 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2158 .vidioc_g_parm = vidioc_g_parm,
2159 .vidioc_s_parm = vidioc_s_parm,
2160 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2161 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2162 #ifdef CONFIG_VIDEO_ADV_DEBUG
2163 .vidioc_g_register = vidioc_g_register,
2164 .vidioc_s_register = vidioc_s_register,
2165 #endif
2166 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2167 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2168 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2169 };
2170
2171 static const struct video_device gspca_template = {
2172 .name = "gspca main driver",
2173 .fops = &dev_fops,
2174 .ioctl_ops = &dev_ioctl_ops,
2175 .release = video_device_release_empty, /* We use v4l2_dev.release */
2176 };
2177
2178 /* initialize the controls */
2179 static void ctrls_init(struct gspca_dev *gspca_dev)
2180 {
2181 struct gspca_ctrl *ctrl;
2182 int i;
2183
2184 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2185 i < gspca_dev->sd_desc->nctrls;
2186 i++, ctrl++) {
2187 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2188 ctrl->val = ctrl->def;
2189 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2190 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2191 }
2192 }
2193
2194 /*
2195 * probe and create a new gspca device
2196 *
2197 * This function must be called by the sub-driver when it is
2198 * called for probing a new device.
2199 */
2200 int gspca_dev_probe2(struct usb_interface *intf,
2201 const struct usb_device_id *id,
2202 const struct sd_desc *sd_desc,
2203 int dev_size,
2204 struct module *module)
2205 {
2206 struct gspca_dev *gspca_dev;
2207 struct usb_device *dev = interface_to_usbdev(intf);
2208 int ret;
2209
2210 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2211 sd_desc->name, id->idVendor, id->idProduct);
2212
2213 /* create the device */
2214 if (dev_size < sizeof *gspca_dev)
2215 dev_size = sizeof *gspca_dev;
2216 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2217 if (!gspca_dev) {
2218 pr_err("couldn't kzalloc gspca struct\n");
2219 return -ENOMEM;
2220 }
2221 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2222 if (!gspca_dev->usb_buf) {
2223 pr_err("out of memory\n");
2224 ret = -ENOMEM;
2225 goto out;
2226 }
2227 gspca_dev->dev = dev;
2228 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2229
2230 /* check if any audio device */
2231 if (dev->actconfig->desc.bNumInterfaces != 1) {
2232 int i;
2233 struct usb_interface *intf2;
2234
2235 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2236 intf2 = dev->actconfig->interface[i];
2237 if (intf2 != NULL
2238 && intf2->altsetting != NULL
2239 && intf2->altsetting->desc.bInterfaceClass ==
2240 USB_CLASS_AUDIO) {
2241 gspca_dev->audio = 1;
2242 break;
2243 }
2244 }
2245 }
2246
2247 gspca_dev->v4l2_dev.release = gspca_release;
2248 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2249 if (ret)
2250 goto out;
2251 gspca_dev->sd_desc = sd_desc;
2252 gspca_dev->nbufread = 2;
2253 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2254 gspca_dev->vdev = gspca_template;
2255 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2256 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2257 set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2258 gspca_dev->module = module;
2259 gspca_dev->present = 1;
2260
2261 mutex_init(&gspca_dev->usb_lock);
2262 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2263 mutex_init(&gspca_dev->queue_lock);
2264 init_waitqueue_head(&gspca_dev->wq);
2265
2266 /* configure the subdriver and initialize the USB device */
2267 ret = sd_desc->config(gspca_dev, id);
2268 if (ret < 0)
2269 goto out;
2270 if (gspca_dev->cam.ctrls != NULL)
2271 ctrls_init(gspca_dev);
2272 ret = sd_desc->init(gspca_dev);
2273 if (ret < 0)
2274 goto out;
2275 if (sd_desc->init_controls)
2276 ret = sd_desc->init_controls(gspca_dev);
2277 if (ret < 0)
2278 goto out;
2279 gspca_set_default_mode(gspca_dev);
2280
2281 ret = gspca_input_connect(gspca_dev);
2282 if (ret)
2283 goto out;
2284
2285 /*
2286 * Don't take usb_lock for these ioctls. This improves latency if
2287 * usb_lock is taken for a long time, e.g. when changing a control
2288 * value, and a new frame is ready to be dequeued.
2289 */
2290 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2291 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2292 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2293
2294 /* init video stuff */
2295 ret = video_register_device(&gspca_dev->vdev,
2296 VFL_TYPE_GRABBER,
2297 -1);
2298 if (ret < 0) {
2299 pr_err("video_register_device err %d\n", ret);
2300 goto out;
2301 }
2302
2303 usb_set_intfdata(intf, gspca_dev);
2304 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2305
2306 gspca_input_create_urb(gspca_dev);
2307
2308 return 0;
2309 out:
2310 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2311 if (gspca_dev->input_dev)
2312 input_unregister_device(gspca_dev->input_dev);
2313 #endif
2314 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2315 kfree(gspca_dev->usb_buf);
2316 kfree(gspca_dev);
2317 return ret;
2318 }
2319 EXPORT_SYMBOL(gspca_dev_probe2);
2320
2321 /* same function as the previous one, but check the interface */
2322 int gspca_dev_probe(struct usb_interface *intf,
2323 const struct usb_device_id *id,
2324 const struct sd_desc *sd_desc,
2325 int dev_size,
2326 struct module *module)
2327 {
2328 struct usb_device *dev = interface_to_usbdev(intf);
2329
2330 /* we don't handle multi-config cameras */
2331 if (dev->descriptor.bNumConfigurations != 1) {
2332 pr_err("%04x:%04x too many config\n",
2333 id->idVendor, id->idProduct);
2334 return -ENODEV;
2335 }
2336
2337 /* the USB video interface must be the first one */
2338 if (dev->actconfig->desc.bNumInterfaces != 1
2339 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2340 return -ENODEV;
2341
2342 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2343 }
2344 EXPORT_SYMBOL(gspca_dev_probe);
2345
2346 /*
2347 * USB disconnection
2348 *
2349 * This function must be called by the sub-driver
2350 * when the device disconnects, after the specific resources are freed.
2351 */
2352 void gspca_disconnect(struct usb_interface *intf)
2353 {
2354 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2355 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2356 struct input_dev *input_dev;
2357 #endif
2358
2359 PDEBUG(D_PROBE, "%s disconnect",
2360 video_device_node_name(&gspca_dev->vdev));
2361
2362 mutex_lock(&gspca_dev->usb_lock);
2363
2364 usb_set_intfdata(intf, NULL);
2365 gspca_dev->dev = NULL;
2366 gspca_dev->present = 0;
2367 destroy_urbs(gspca_dev);
2368
2369 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2370 gspca_input_destroy_urb(gspca_dev);
2371 input_dev = gspca_dev->input_dev;
2372 if (input_dev) {
2373 gspca_dev->input_dev = NULL;
2374 input_unregister_device(input_dev);
2375 }
2376 #endif
2377 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2378 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2379 gspca_dev->sd_desc->stop0(gspca_dev);
2380 gspca_dev->streaming = 0;
2381 wake_up_interruptible(&gspca_dev->wq);
2382
2383 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2384 video_unregister_device(&gspca_dev->vdev);
2385
2386 mutex_unlock(&gspca_dev->usb_lock);
2387
2388 /* (this will call gspca_release() immediately or on last close) */
2389 v4l2_device_put(&gspca_dev->v4l2_dev);
2390 }
2391 EXPORT_SYMBOL(gspca_disconnect);
2392
2393 #ifdef CONFIG_PM
2394 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2395 {
2396 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2397
2398 if (!gspca_dev->streaming)
2399 return 0;
2400 mutex_lock(&gspca_dev->usb_lock);
2401 gspca_dev->frozen = 1; /* avoid urb error messages */
2402 gspca_dev->usb_err = 0;
2403 if (gspca_dev->sd_desc->stopN)
2404 gspca_dev->sd_desc->stopN(gspca_dev);
2405 destroy_urbs(gspca_dev);
2406 gspca_input_destroy_urb(gspca_dev);
2407 gspca_set_alt0(gspca_dev);
2408 if (gspca_dev->sd_desc->stop0)
2409 gspca_dev->sd_desc->stop0(gspca_dev);
2410 mutex_unlock(&gspca_dev->usb_lock);
2411 return 0;
2412 }
2413 EXPORT_SYMBOL(gspca_suspend);
2414
2415 int gspca_resume(struct usb_interface *intf)
2416 {
2417 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2418 int streaming, ret = 0;
2419
2420 mutex_lock(&gspca_dev->usb_lock);
2421 gspca_dev->frozen = 0;
2422 gspca_dev->usb_err = 0;
2423 gspca_dev->sd_desc->init(gspca_dev);
2424 gspca_input_create_urb(gspca_dev);
2425 /*
2426 * Most subdrivers send all ctrl values on sd_start and thus
2427 * only write to the device registers on s_ctrl when streaming ->
2428 * Clear streaming to avoid setting all ctrls twice.
2429 */
2430 streaming = gspca_dev->streaming;
2431 gspca_dev->streaming = 0;
2432 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
2433 if (streaming)
2434 ret = gspca_init_transfer(gspca_dev);
2435 mutex_unlock(&gspca_dev->usb_lock);
2436 return ret;
2437 }
2438 EXPORT_SYMBOL(gspca_resume);
2439 #endif
2440
2441 /* -- module insert / remove -- */
2442 static int __init gspca_init(void)
2443 {
2444 pr_info("v" GSPCA_VERSION " registered\n");
2445 return 0;
2446 }
2447 static void __exit gspca_exit(void)
2448 {
2449 }
2450
2451 module_init(gspca_init);
2452 module_exit(gspca_exit);
2453
2454 #ifdef GSPCA_DEBUG
2455 module_param_named(debug, gspca_debug, int, 0644);
2456 MODULE_PARM_DESC(debug,
2457 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2458 " 0x08:stream 0x10:frame 0x20:packet"
2459 " 0x0100: v4l2");
2460 #endif