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V4L/DVB (9078): gspca: New exported function to retrieve the current frame buffer.
[deliverable/linux.git] / drivers / media / video / gspca / gspca.c
CommitLineData
63eb9546
JFM		 1/*
2 * Main USB camera driver
3 *
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#define MODULE_NAME "gspca"
22
23#include <linux/init.h>
24#include <linux/fs.h>
25#include <linux/vmalloc.h>
26#include <linux/sched.h>
27#include <linux/slab.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/pagemap.h>
956e42d2 31#include <linux/io.h>
63eb9546 32#include <asm/page.h>
956e42d2 33#include <linux/uaccess.h>
63eb9546 34#include <linux/jiffies.h>
35ea11ff 35#include <media/v4l2-ioctl.h>
63eb9546
JFM		 36
37#include "gspca.h"
38
d43fa32f 39/* global values */
ac0d6df6 40#define DEF_NURBS 2 /* default number of URBs */
d43fa32f 41
63eb9546
JFM		 42MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
43MODULE_DESCRIPTION("GSPCA USB Camera Driver");
44MODULE_LICENSE("GPL");
45
3371bcc3 46#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 3, 0)
63eb9546
JFM		 47
48static int video_nr = -1;
49
335b3f88 50#ifdef GSPCA_DEBUG
63eb9546
JFM		 51int gspca_debug = D_ERR | D_PROBE;
52EXPORT_SYMBOL(gspca_debug);
53
54static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
55{
56 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
57 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
58 txt,
59 pixfmt & 0xff,
60 (pixfmt >> 8) & 0xff,
61 (pixfmt >> 16) & 0xff,
62 pixfmt >> 24,
63 w, h);
64 } else {
65 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
66 txt,
67 pixfmt,
68 w, h);
69 }
70}
71#else
72#define PDEBUG_MODE(txt, pixfmt, w, h)
73#endif
74
d43fa32f
JFM		 75/* specific memory types - !! should different from V4L2_MEMORY_xxx */
76#define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
77#define GSPCA_MEMORY_READ 7
78
d43fa32f 79#define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
d43fa32f 80
63eb9546
JFM		 81/*
82 * VMA operations.
83 */
84static void gspca_vm_open(struct vm_area_struct *vma)
85{
86 struct gspca_frame *frame = vma->vm_private_data;
87
88 frame->vma_use_count++;
89 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
90}
91
92static void gspca_vm_close(struct vm_area_struct *vma)
93{
94 struct gspca_frame *frame = vma->vm_private_data;
95
96 if (--frame->vma_use_count <= 0)
97 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
98}
99
100static struct vm_operations_struct gspca_vm_ops = {
101 .open = gspca_vm_open,
102 .close = gspca_vm_close,
103};
104
1b60e1ad
JFM		 105/* get the current input frame buffer */
106struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
107{
108 struct gspca_frame *frame;
109 int i;
110
111 i = gspca_dev->fr_i;
112 i = gspca_dev->fr_queue[i];
113 frame = &gspca_dev->frame[i];
114 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
115 != V4L2_BUF_FLAG_QUEUED)
116 return NULL;
117 return frame;
118}
119EXPORT_SYMBOL(gspca_get_i_frame);
120
63eb9546 121/*
d43fa32f 122 * fill a video frame from an URB and resubmit
63eb9546 123 */
d43fa32f
JFM		 124static void fill_frame(struct gspca_dev *gspca_dev,
125 struct urb *urb)
63eb9546 126{
63eb9546 127 struct gspca_frame *frame;
6a7eba24 128 __u8 *data; /* address of data in the iso message */
1b60e1ad 129 int i, len, st;
63eb9546
JFM		 130 cam_pkt_op pkt_scan;
131
6a7eba24 132 if (urb->status != 0) {
62ee8eee 133#ifdef CONFIG_PM
6a709749 134 if (!gspca_dev->frozen)
62ee8eee 135#endif
6a709749 136 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
6a7eba24
JFM		 137 return; /* disconnection ? */
138 }
63eb9546
JFM		 139 pkt_scan = gspca_dev->sd_desc->pkt_scan;
140 for (i = 0; i < urb->number_of_packets; i++) {
141
142 /* check the availability of the frame buffer */
1b60e1ad
JFM		 143 frame = gspca_get_i_frame(gspca_dev);
144 if (!frame) {
63eb9546
JFM		 145 gspca_dev->last_packet_type = DISCARD_PACKET;
146 break;
147 }
148
149 /* check the packet status and length */
150 len = urb->iso_frame_desc[i].actual_length;
6a7eba24
JFM		 151 if (len == 0)
152 continue;
63eb9546
JFM		 153 st = urb->iso_frame_desc[i].status;
154 if (st) {
6a7eba24
JFM		 155 PDEBUG(D_ERR,
156 "ISOC data error: [%d] len=%d, status=%d",
63eb9546
JFM		 157 i, len, st);
158 gspca_dev->last_packet_type = DISCARD_PACKET;
159 continue;
160 }
63eb9546
JFM		 161
162 /* let the packet be analyzed by the subdriver */
163 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
164 i, urb->iso_frame_desc[i].offset, len);
6a7eba24 165 data = (__u8 *) urb->transfer_buffer
63eb9546
JFM		 166 + urb->iso_frame_desc[i].offset;
167 pkt_scan(gspca_dev, frame, data, len);
168 }
169
170 /* resubmit the URB */
171 urb->status = 0;
172 st = usb_submit_urb(urb, GFP_ATOMIC);
173 if (st < 0)
174 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
175}
176
d43fa32f
JFM		 177/*
178 * ISOC message interrupt from the USB device
179 *
ac0d6df6 180 * Analyse each packet and call the subdriver for copy to the frame buffer.
d43fa32f 181 */
ac0d6df6 182static void isoc_irq(struct urb *urb
6a7eba24 183)
d43fa32f
JFM		 184{
185 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
186
3647fea8 187 PDEBUG(D_PACK, "isoc irq");
d43fa32f
JFM		 188 if (!gspca_dev->streaming)
189 return;
190 fill_frame(gspca_dev, urb);
191}
192
0be01004
JFM		 193/*
194 * bulk message interrupt from the USB device
195 */
196static void bulk_irq(struct urb *urb
197)
198{
199 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
200 struct gspca_frame *frame;
0be01004
JFM		 201
202 PDEBUG(D_PACK, "bulk irq");
203 if (!gspca_dev->streaming)
204 return;
205 if (urb->status != 0 && urb->status != -ECONNRESET) {
206#ifdef CONFIG_PM
207 if (!gspca_dev->frozen)
208#endif
209 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
210 return; /* disconnection ? */
211 }
212
213 /* check the availability of the frame buffer */
1b60e1ad
JFM		 214 frame = gspca_get_i_frame(gspca_dev);
215 if (!frame) {
0be01004
JFM		 216 gspca_dev->last_packet_type = DISCARD_PACKET;
217 } else {
218 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
219 gspca_dev->sd_desc->pkt_scan(gspca_dev,
220 frame,
221 urb->transfer_buffer,
222 urb->actual_length);
223 }
0be01004
JFM		 224}
225
63eb9546
JFM		 226/*
227 * add data to the current frame
228 *
ac0d6df6
JFM		 229 * This function is called by the subdrivers at interrupt level.
230 *
63eb9546
JFM		 231 * To build a frame, these ones must add
232 * - one FIRST_PACKET
233 * - 0 or many INTER_PACKETs
234 * - one LAST_PACKET
235 * DISCARD_PACKET invalidates the whole frame.
236 * On LAST_PACKET, a new frame is returned.
237 */
238struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
239 int packet_type,
240 struct gspca_frame *frame,
a5ae2062 241 const __u8 *data,
63eb9546
JFM		 242 int len)
243{
244 int i, j;
245
e2997a72 246 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
63eb9546
JFM		 247
248 /* when start of a new frame, if the current frame buffer
249 * is not queued, discard the whole frame */
250 if (packet_type == FIRST_PACKET) {
d43fa32f
JFM		 251 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
252 != V4L2_BUF_FLAG_QUEUED) {
63eb9546
JFM		 253 gspca_dev->last_packet_type = DISCARD_PACKET;
254 return frame;
255 }
256 frame->data_end = frame->data;
257 jiffies_to_timeval(get_jiffies_64(),
258 &frame->v4l2_buf.timestamp);
259 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
d43fa32f 260 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
06ca78fa
JFM		 261 if (packet_type == LAST_PACKET)
262 gspca_dev->last_packet_type = packet_type;
63eb9546 263 return frame;
d43fa32f 264 }
63eb9546 265
d43fa32f 266 /* append the packet to the frame buffer */
63eb9546
JFM		 267 if (len > 0) {
268 if (frame->data_end - frame->data + len
269 > frame->v4l2_buf.length) {
a9e11134 270 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
63eb9546
JFM		 271 frame->data_end - frame->data + len,
272 frame->v4l2_buf.length);
273 packet_type = DISCARD_PACKET;
274 } else {
ac0d6df6 275 memcpy(frame->data_end, data, len);
63eb9546
JFM		 276 frame->data_end += len;
277 }
278 }
279 gspca_dev->last_packet_type = packet_type;
280
281 /* if last packet, wake the application and advance in the queue */
282 if (packet_type == LAST_PACKET) {
283 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
284 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
285 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
286 atomic_inc(&gspca_dev->nevent);
287 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
d43fa32f
JFM		 288 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
289 gspca_dev->fr_i = i;
63eb9546
JFM		 290 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
291 frame->v4l2_buf.bytesused,
292 gspca_dev->fr_q,
293 i,
294 gspca_dev->fr_o);
295 j = gspca_dev->fr_queue[i];
296 frame = &gspca_dev->frame[j];
63eb9546
JFM		 297 }
298 return frame;
299}
300EXPORT_SYMBOL(gspca_frame_add);
301
302static int gspca_is_compressed(__u32 format)
303{
304 switch (format) {
305 case V4L2_PIX_FMT_MJPEG:
306 case V4L2_PIX_FMT_JPEG:
50a871fe 307 case V4L2_PIX_FMT_SPCA561:
ab8f12cf 308 case V4L2_PIX_FMT_PAC207:
63eb9546
JFM		 309 return 1;
310 }
311 return 0;
312}
313
314static void *rvmalloc(unsigned long size)
315{
316 void *mem;
317 unsigned long adr;
318
d43fa32f 319/* size = PAGE_ALIGN(size); (already done) */
63eb9546 320 mem = vmalloc_32(size);
efab8211 321 if (mem != NULL) {
63eb9546
JFM		 322 adr = (unsigned long) mem;
323 while ((long) size > 0) {
324 SetPageReserved(vmalloc_to_page((void *) adr));
325 adr += PAGE_SIZE;
326 size -= PAGE_SIZE;
327 }
328 }
329 return mem;
330}
331
ac0d6df6 332static void rvfree(void *mem, long size)
63eb9546
JFM		 333{
334 unsigned long adr;
335
63eb9546 336 adr = (unsigned long) mem;
ac0d6df6 337 while (size > 0) {
63eb9546
JFM		 338 ClearPageReserved(vmalloc_to_page((void *) adr));
339 adr += PAGE_SIZE;
340 size -= PAGE_SIZE;
341 }
342 vfree(mem);
343}
344
345static int frame_alloc(struct gspca_dev *gspca_dev,
d43fa32f 346 unsigned int count)
63eb9546 347{
d43fa32f
JFM		 348 struct gspca_frame *frame;
349 unsigned int frsz;
350 int i;
63eb9546 351
c2446b3e
JFM		 352 i = gspca_dev->curr_mode;
353 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
63eb9546 354 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
63eb9546 355 frsz = PAGE_ALIGN(frsz);
63eb9546 356 gspca_dev->frsz = frsz;
c2446b3e
JFM		 357 if (count > GSPCA_MAX_FRAMES)
358 count = GSPCA_MAX_FRAMES;
ac0d6df6
JFM		 359 gspca_dev->frbuf = rvmalloc(frsz * count);
360 if (!gspca_dev->frbuf) {
361 err("frame alloc failed");
362 return -ENOMEM;
63eb9546
JFM		 363 }
364 gspca_dev->nframes = count;
365 for (i = 0; i < count; i++) {
d43fa32f
JFM		 366 frame = &gspca_dev->frame[i];
367 frame->v4l2_buf.index = i;
368 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
369 frame->v4l2_buf.flags = 0;
370 frame->v4l2_buf.field = V4L2_FIELD_NONE;
371 frame->v4l2_buf.length = frsz;
372 frame->v4l2_buf.memory = gspca_dev->memory;
373 frame->v4l2_buf.sequence = 0;
ac0d6df6 374 frame->data = frame->data_end =
d43fa32f 375 gspca_dev->frbuf + i * frsz;
ac0d6df6 376 frame->v4l2_buf.m.offset = i * frsz;
63eb9546
JFM		 377 }
378 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
379 gspca_dev->last_packet_type = DISCARD_PACKET;
380 gspca_dev->sequence = 0;
381 atomic_set(&gspca_dev->nevent, 0);
d43fa32f 382 return 0;
63eb9546
JFM		 383}
384
385static void frame_free(struct gspca_dev *gspca_dev)
386{
387 int i;
388
389 PDEBUG(D_STREAM, "frame free");
efab8211 390 if (gspca_dev->frbuf != NULL) {
63eb9546
JFM		 391 rvfree(gspca_dev->frbuf,
392 gspca_dev->nframes * gspca_dev->frsz);
393 gspca_dev->frbuf = NULL;
394 for (i = 0; i < gspca_dev->nframes; i++)
395 gspca_dev->frame[i].data = NULL;
396 }
397 gspca_dev->nframes = 0;
398}
399
d43fa32f 400static void destroy_urbs(struct gspca_dev *gspca_dev)
63eb9546
JFM		 401{
402 struct urb *urb;
403 unsigned int i;
404
405 PDEBUG(D_STREAM, "kill transfer");
d43fa32f 406 for (i = 0; i < MAX_NURBS; ++i) {
4aa0d037 407 urb = gspca_dev->urb[i];
63eb9546 408 if (urb == NULL)
d43fa32f 409 break;
63eb9546 410
4aa0d037 411 gspca_dev->urb[i] = NULL;
63eb9546 412 usb_kill_urb(urb);
efab8211 413 if (urb->transfer_buffer != NULL)
63eb9546
JFM		 414 usb_buffer_free(gspca_dev->dev,
415 urb->transfer_buffer_length,
4aa0d037 416 urb->transfer_buffer,
63eb9546 417 urb->transfer_dma);
63eb9546
JFM		 418 usb_free_urb(urb);
419 }
63eb9546
JFM		 420}
421
422/*
0be01004 423 * search an input transfer endpoint in an alternate setting
63eb9546 424 */
0be01004
JFM		 425static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
426 __u8 epaddr,
427 __u8 xfer)
63eb9546
JFM		 428{
429 struct usb_host_endpoint *ep;
430 int i, attr;
431
432 epaddr |= USB_DIR_IN;
433 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
434 ep = &alt->endpoint[i];
435 if (ep->desc.bEndpointAddress == epaddr) {
436 attr = ep->desc.bmAttributes
437 & USB_ENDPOINT_XFERTYPE_MASK;
0be01004 438 if (attr == xfer)
63eb9546
JFM		 439 return ep;
440 break;
441 }
442 }
443 return NULL;
444}
445
446/*
0be01004 447 * search an input (isoc or bulk) endpoint
63eb9546
JFM		 448 *
449 * The endpoint is defined by the subdriver.
450 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
451 * This routine may be called many times when the bandwidth is too small
452 * (the bandwidth is checked on urb submit).
453 */
0be01004 454static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
63eb9546
JFM		 455{
456 struct usb_interface *intf;
457 struct usb_host_endpoint *ep;
458 int i, ret;
459
460 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
6a7eba24 461 ep = NULL;
63eb9546
JFM		 462 i = gspca_dev->alt; /* previous alt setting */
463 while (--i > 0) { /* alt 0 is unusable */
0be01004
JFM		 464 ep = alt_xfer(&intf->altsetting[i],
465 gspca_dev->cam.epaddr,
466 gspca_dev->bulk
467 ? USB_ENDPOINT_XFER_BULK
468 : USB_ENDPOINT_XFER_ISOC);
63eb9546
JFM		 469 if (ep)
470 break;
471 }
6a7eba24 472 if (ep == NULL) {
0be01004 473 err("no transfer endpoint found");
63eb9546
JFM		 474 return NULL;
475 }
0be01004 476 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
63eb9546
JFM		 477 i, ep->desc.bEndpointAddress);
478 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
479 if (ret < 0) {
480 err("set interface err %d", ret);
481 return NULL;
482 }
d43fa32f 483 gspca_dev->alt = i; /* memorize the current alt setting */
63eb9546
JFM		 484 return ep;
485}
486
487/*
0be01004 488 * create the URBs for image transfer
63eb9546
JFM		 489 */
490static int create_urbs(struct gspca_dev *gspca_dev,
491 struct usb_host_endpoint *ep)
492{
493 struct urb *urb;
d43fa32f 494 int n, nurbs, i, psize, npkt, bsize;
63eb9546
JFM		 495
496 /* calculate the packet size and the number of packets */
63eb9546 497 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
d43fa32f 498
63eb9546
JFM		 499 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
500 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
0be01004
JFM		 501 if (!gspca_dev->bulk) {
502 npkt = ISO_MAX_SIZE / psize;
503 if (npkt > ISO_MAX_PKT)
504 npkt = ISO_MAX_PKT;
505 bsize = psize * npkt;
506 PDEBUG(D_STREAM,
507 "isoc %d pkts size %d = bsize:%d",
508 npkt, psize, bsize);
51977a8d 509 nurbs = DEF_NURBS;
0be01004
JFM		 510 } else {
511 npkt = 0;
512 bsize = psize;
513 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
51977a8d 514 nurbs = 1;
0be01004
JFM		 515 }
516
6a7eba24 517 gspca_dev->nurbs = nurbs;
d43fa32f 518 for (n = 0; n < nurbs; n++) {
63eb9546
JFM		 519 urb = usb_alloc_urb(npkt, GFP_KERNEL);
520 if (!urb) {
521 err("usb_alloc_urb failed");
0d0548e6 522 destroy_urbs(gspca_dev);
63eb9546
JFM		 523 return -ENOMEM;
524 }
4aa0d037 525 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
63eb9546
JFM		 526 bsize,
527 GFP_KERNEL,
528 &urb->transfer_dma);
529
4aa0d037 530 if (urb->transfer_buffer == NULL) {
63eb9546 531 usb_free_urb(urb);
63eb9546 532 err("usb_buffer_urb failed");
0d0548e6 533 destroy_urbs(gspca_dev);
63eb9546
JFM		 534 return -ENOMEM;
535 }
4aa0d037 536 gspca_dev->urb[n] = urb;
63eb9546
JFM		 537 urb->dev = gspca_dev->dev;
538 urb->context = gspca_dev;
63eb9546 539 urb->transfer_buffer_length = bsize;
0be01004
JFM		 540 if (npkt != 0) { /* ISOC */
541 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
542 ep->desc.bEndpointAddress);
543 urb->transfer_flags = URB_ISO_ASAP
544 | URB_NO_TRANSFER_DMA_MAP;
545 urb->interval = ep->desc.bInterval;
546 urb->complete = isoc_irq;
547 urb->number_of_packets = npkt;
548 for (i = 0; i < npkt; i++) {
549 urb->iso_frame_desc[i].length = psize;
550 urb->iso_frame_desc[i].offset = psize * i;
551 }
552 } else { /* bulk */
553 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
554 ep->desc.bEndpointAddress),
555 urb->complete = bulk_irq;
63eb9546
JFM		 556 }
557 }
558 return 0;
559}
560
561/*
562 * start the USB transfer
563 */
564static int gspca_init_transfer(struct gspca_dev *gspca_dev)
565{
63eb9546
JFM		 566 struct usb_host_endpoint *ep;
567 int n, ret;
568
e2997a72
HG		 569 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
570 return -ERESTARTSYS;
63eb9546 571
d43fa32f
JFM		 572 /* set the higher alternate setting and
573 * loop until urb submit succeeds */
574 gspca_dev->alt = gspca_dev->nbalt;
63eb9546 575 for (;;) {
d43fa32f 576 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
0be01004 577 ep = get_ep(gspca_dev);
63eb9546
JFM		 578 if (ep == NULL) {
579 ret = -EIO;
580 goto out;
581 }
582 ret = create_urbs(gspca_dev, ep);
583 if (ret < 0)
584 goto out;
585
586 /* start the cam */
587 gspca_dev->sd_desc->start(gspca_dev);
588 gspca_dev->streaming = 1;
589 atomic_set(&gspca_dev->nevent, 0);
590
51977a8d
JFM		 591 /* start the bulk transfer is done by the subdriver */
592 if (gspca_dev->bulk)
593 break;
594
63eb9546 595 /* submit the URBs */
d43fa32f 596 for (n = 0; n < gspca_dev->nurbs; n++) {
4aa0d037 597 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
63eb9546
JFM		 598 if (ret < 0) {
599 PDEBUG(D_ERR|D_STREAM,
600 "usb_submit_urb [%d] err %d", n, ret);
e2997a72 601 gspca_dev->streaming = 0;
d43fa32f 602 destroy_urbs(gspca_dev);
63eb9546
JFM		 603 if (ret == -ENOSPC)
604 break; /* try the previous alt */
605 goto out;
606 }
607 }
608 if (ret >= 0)
609 break;
610 }
611out:
612 mutex_unlock(&gspca_dev->usb_lock);
613 return ret;
614}
615
616static int gspca_set_alt0(struct gspca_dev *gspca_dev)
617{
618 int ret;
619
620 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
621 if (ret < 0)
622 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
623 return ret;
624}
625
e2997a72 626/* Note both the queue and the usb lock should be hold when calling this */
63eb9546
JFM		 627static void gspca_stream_off(struct gspca_dev *gspca_dev)
628{
63eb9546 629 gspca_dev->streaming = 0;
d43fa32f 630 atomic_set(&gspca_dev->nevent, 0);
63eb9546 631 if (gspca_dev->present) {
012d6b02
JFM		 632 if (gspca_dev->sd_desc->stopN)
633 gspca_dev->sd_desc->stopN(gspca_dev);
d43fa32f 634 destroy_urbs(gspca_dev);
63eb9546 635 gspca_set_alt0(gspca_dev);
012d6b02
JFM		 636 if (gspca_dev->sd_desc->stop0)
637 gspca_dev->sd_desc->stop0(gspca_dev);
63eb9546 638 PDEBUG(D_STREAM, "stream off OK");
63eb9546 639 }
63eb9546
JFM		 640}
641
d43fa32f 642static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
63eb9546
JFM		 643{
644 int i;
645
646 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
647 gspca_dev->curr_mode = i;
648 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
649 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
c2446b3e 650 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
63eb9546
JFM		 651}
652
653static int wxh_to_mode(struct gspca_dev *gspca_dev,
654 int width, int height)
655{
656 int i;
657
d43fa32f
JFM		 658 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
659 if (width >= gspca_dev->cam.cam_mode[i].width
660 && height >= gspca_dev->cam.cam_mode[i].height)
63eb9546
JFM		 661 break;
662 }
63eb9546
JFM		 663 return i;
664}
665
63eb9546
JFM		 666/*
667 * search a mode with the right pixel format
668 */
669static int gspca_get_mode(struct gspca_dev *gspca_dev,
670 int mode,
671 int pixfmt)
672{
673 int modeU, modeD;
674
675 modeU = modeD = mode;
676 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
677 if (--modeD >= 0) {
c2446b3e
JFM		 678 if (gspca_dev->cam.cam_mode[modeD].pixelformat
679 == pixfmt)
63eb9546
JFM		 680 return modeD;
681 }
682 if (++modeU < gspca_dev->cam.nmodes) {
c2446b3e
JFM		 683 if (gspca_dev->cam.cam_mode[modeU].pixelformat
684 == pixfmt)
63eb9546
JFM		 685 return modeU;
686 }
687 }
688 return -EINVAL;
689}
690
e078770a 691static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 692 struct v4l2_fmtdesc *fmtdesc)
693{
694 struct gspca_dev *gspca_dev = priv;
6a7eba24 695 int i, j, index;
63eb9546
JFM		 696 __u32 fmt_tb[8];
697
63eb9546
JFM		 698 /* give an index to each format */
699 index = 0;
700 j = 0;
701 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
c2446b3e 702 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
63eb9546
JFM		 703 j = 0;
704 for (;;) {
705 if (fmt_tb[j] == fmt_tb[index])
706 break;
707 j++;
708 }
709 if (j == index) {
710 if (fmtdesc->index == index)
711 break; /* new format */
712 index++;
713 if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
714 return -EINVAL;
715 }
716 }
717 if (i < 0)
718 return -EINVAL; /* no more format */
719
63eb9546
JFM		 720 fmtdesc->pixelformat = fmt_tb[index];
721 if (gspca_is_compressed(fmt_tb[index]))
722 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
d43fa32f 723 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
63eb9546
JFM		 724 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
725 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
726 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
727 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
728 fmtdesc->description[4] = '\0';
729 return 0;
730}
731
e078770a 732static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 733 struct v4l2_format *fmt)
734{
735 struct gspca_dev *gspca_dev = priv;
c2446b3e 736 int mode;
63eb9546 737
6a7eba24
JFM		 738 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
739 return -EINVAL;
c2446b3e
JFM		 740 mode = gspca_dev->curr_mode;
741 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
742 sizeof fmt->fmt.pix);
63eb9546
JFM		 743 return 0;
744}
745
e078770a 746static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
63eb9546
JFM		 747 struct v4l2_format *fmt)
748{
24c530b4 749 int w, h, mode, mode2;
63eb9546 750
6a7eba24
JFM		 751 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
752 return -EINVAL;
4aa0d037
JFM		 753 w = fmt->fmt.pix.width;
754 h = fmt->fmt.pix.height;
d43fa32f 755
335b3f88 756#ifdef GSPCA_DEBUG
63eb9546
JFM		 757 if (gspca_debug & D_CONF)
758 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
759#endif
760 /* search the closest mode for width and height */
761 mode = wxh_to_mode(gspca_dev, w, h);
762
763 /* OK if right palette */
c2446b3e
JFM		 764 if (gspca_dev->cam.cam_mode[mode].pixelformat
765 != fmt->fmt.pix.pixelformat) {
63eb9546
JFM		 766
767 /* else, search the closest mode with the same pixel format */
768 mode2 = gspca_get_mode(gspca_dev, mode,
769 fmt->fmt.pix.pixelformat);
c2446b3e 770 if (mode2 >= 0)
63eb9546 771 mode = mode2;
c2446b3e
JFM		 772/* else
773 ; * no chance, return this mode */
63eb9546 774 }
c2446b3e
JFM		 775 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
776 sizeof fmt->fmt.pix);
63eb9546
JFM		 777 return mode; /* used when s_fmt */
778}
779
e078770a 780static int vidioc_try_fmt_vid_cap(struct file *file,
63eb9546
JFM		 781 void *priv,
782 struct v4l2_format *fmt)
783{
4aa0d037 784 struct gspca_dev *gspca_dev = priv;
63eb9546
JFM		 785 int ret;
786
e078770a 787 ret = try_fmt_vid_cap(gspca_dev, fmt);
63eb9546
JFM		 788 if (ret < 0)
789 return ret;
790 return 0;
791}
792
e078770a 793static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 794 struct v4l2_format *fmt)
795{
796 struct gspca_dev *gspca_dev = priv;
d43fa32f 797 int ret;
63eb9546 798
e2997a72
HG		 799 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
800 return -ERESTARTSYS;
d43fa32f 801
e078770a 802 ret = try_fmt_vid_cap(gspca_dev, fmt);
63eb9546
JFM		 803 if (ret < 0)
804 goto out;
805
d43fa32f
JFM		 806 if (gspca_dev->nframes != 0
807 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
808 ret = -EINVAL;
809 goto out;
810 }
811
50a871fe
JFM		 812 if (ret == gspca_dev->curr_mode) {
813 ret = 0;
63eb9546 814 goto out; /* same mode */
50a871fe 815 }
d43fa32f
JFM		 816
817 if (gspca_dev->streaming) {
818 ret = -EBUSY;
819 goto out;
e2997a72 820 }
4aa0d037
JFM		 821 gspca_dev->width = fmt->fmt.pix.width;
822 gspca_dev->height = fmt->fmt.pix.height;
63eb9546
JFM		 823 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
824 gspca_dev->curr_mode = ret;
d43fa32f 825
d43fa32f 826 ret = 0;
63eb9546
JFM		 827out:
828 mutex_unlock(&gspca_dev->queue_lock);
829 return ret;
830}
831
832static int dev_open(struct inode *inode, struct file *file)
833{
834 struct gspca_dev *gspca_dev;
835 int ret;
836
d43fa32f 837 PDEBUG(D_STREAM, "%s open", current->comm);
63eb9546 838 gspca_dev = (struct gspca_dev *) video_devdata(file);
e2997a72
HG		 839 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
840 return -ERESTARTSYS;
63eb9546
JFM		 841 if (!gspca_dev->present) {
842 ret = -ENODEV;
843 goto out;
844 }
845
012d6b02 846 if (gspca_dev->users > 4) { /* (arbitrary value) */
63eb9546
JFM		 847 ret = -EBUSY;
848 goto out;
849 }
850 gspca_dev->users++;
851 file->private_data = gspca_dev;
335b3f88 852#ifdef GSPCA_DEBUG
63eb9546 853 /* activate the v4l2 debug */
d43fa32f 854 if (gspca_debug & D_V4L2)
9de436cf
FZ		 855 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
856 | V4L2_DEBUG_IOCTL_ARG;
63eb9546 857 else
9de436cf
FZ		 858 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
859 | V4L2_DEBUG_IOCTL_ARG);
63eb9546 860#endif
012d6b02 861 ret = 0;
63eb9546
JFM		 862out:
863 mutex_unlock(&gspca_dev->queue_lock);
864 if (ret != 0)
865 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
866 else
d43fa32f 867 PDEBUG(D_STREAM, "open done");
63eb9546
JFM		 868 return ret;
869}
870
871static int dev_close(struct inode *inode, struct file *file)
872{
873 struct gspca_dev *gspca_dev = file->private_data;
874
d43fa32f 875 PDEBUG(D_STREAM, "%s close", current->comm);
e2997a72
HG		 876 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
877 return -ERESTARTSYS;
878 gspca_dev->users--;
e2997a72 879
5b77ae77 880 /* if the file did the capture, free the streaming resources */
4aa0d037 881 if (gspca_dev->capt_file == file) {
a1e8288b
JFM		 882 if (gspca_dev->streaming) {
883 mutex_lock(&gspca_dev->usb_lock);
884 gspca_stream_off(gspca_dev);
885 mutex_unlock(&gspca_dev->usb_lock);
886 }
4aa0d037 887 frame_free(gspca_dev);
efab8211 888 gspca_dev->capt_file = NULL;
d43fa32f 889 gspca_dev->memory = GSPCA_MEMORY_NO;
4aa0d037 890 }
d43fa32f 891 file->private_data = NULL;
63eb9546 892 mutex_unlock(&gspca_dev->queue_lock);
d43fa32f 893 PDEBUG(D_STREAM, "close done");
63eb9546
JFM		 894 return 0;
895}
896
897static int vidioc_querycap(struct file *file, void *priv,
898 struct v4l2_capability *cap)
899{
900 struct gspca_dev *gspca_dev = priv;
901
63eb9546
JFM		 902 memset(cap, 0, sizeof *cap);
903 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
c6edaf16
JFM		 904/* strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
905 if (gspca_dev->dev->product != NULL) {
906 strncpy(cap->card, gspca_dev->dev->product,
907 sizeof cap->card);
908 } else {
909 snprintf(cap->card, sizeof cap->card,
910 "USB Camera (%04x:%04x)",
911 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
912 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
913 }
63eb9546
JFM		 914 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
915 sizeof cap->bus_info);
916 cap->version = DRIVER_VERSION_NUMBER;
917 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
918 | V4L2_CAP_STREAMING
919 | V4L2_CAP_READWRITE;
920 return 0;
921}
922
923static int vidioc_queryctrl(struct file *file, void *priv,
924 struct v4l2_queryctrl *q_ctrl)
925{
926 struct gspca_dev *gspca_dev = priv;
f50ba1be 927 int i, ix;
6a7eba24
JFM		 928 u32 id;
929
f50ba1be 930 ix = -1;
6a7eba24
JFM		 931 id = q_ctrl->id;
932 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
933 id &= V4L2_CTRL_ID_MASK;
934 id++;
935 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
0f523c2f 936 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
f50ba1be
JFM		 937 continue;
938 if (ix < 0) {
939 ix = i;
940 continue;
6a7eba24 941 }
f50ba1be
JFM		 942 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
943 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
944 continue;
945 ix = i;
6a7eba24 946 }
6a7eba24 947 }
63eb9546 948 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
6a7eba24 949 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
f50ba1be
JFM		 950 ix = i;
951 break;
63eb9546
JFM		 952 }
953 }
f50ba1be
JFM		 954 if (ix < 0)
955 return -EINVAL;
956 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
957 sizeof *q_ctrl);
958 if (gspca_dev->ctrl_dis & (1 << ix))
959 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
960 return 0;
63eb9546
JFM		 961}
962
963static int vidioc_s_ctrl(struct file *file, void *priv,
964 struct v4l2_control *ctrl)
965{
966 struct gspca_dev *gspca_dev = priv;
a5ae2062 967 const struct ctrl *ctrls;
63eb9546
JFM		 968 int i, ret;
969
63eb9546
JFM		 970 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
971 i < gspca_dev->sd_desc->nctrls;
972 i++, ctrls++) {
973 if (ctrl->id != ctrls->qctrl.id)
974 continue;
0f523c2f
HG		 975 if (gspca_dev->ctrl_dis & (1 << i))
976 return -EINVAL;
63eb9546 977 if (ctrl->value < ctrls->qctrl.minimum
fcf5cb24 978 || ctrl->value > ctrls->qctrl.maximum)
63eb9546
JFM		 979 return -ERANGE;
980 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
e2997a72
HG		 981 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
982 return -ERESTARTSYS;
63eb9546
JFM		 983 ret = ctrls->set(gspca_dev, ctrl->value);
984 mutex_unlock(&gspca_dev->usb_lock);
985 return ret;
986 }
987 return -EINVAL;
988}
989
990static int vidioc_g_ctrl(struct file *file, void *priv,
991 struct v4l2_control *ctrl)
992{
993 struct gspca_dev *gspca_dev = priv;
994
a5ae2062 995 const struct ctrl *ctrls;
63eb9546
JFM		 996 int i, ret;
997
998 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
999 i < gspca_dev->sd_desc->nctrls;
1000 i++, ctrls++) {
1001 if (ctrl->id != ctrls->qctrl.id)
1002 continue;
0f523c2f
HG		 1003 if (gspca_dev->ctrl_dis & (1 << i))
1004 return -EINVAL;
e2997a72
HG		 1005 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1006 return -ERESTARTSYS;
63eb9546
JFM		 1007 ret = ctrls->get(gspca_dev, &ctrl->value);
1008 mutex_unlock(&gspca_dev->usb_lock);
1009 return ret;
1010 }
1011 return -EINVAL;
1012}
1013
1014static int vidioc_querymenu(struct file *file, void *priv,
1015 struct v4l2_querymenu *qmenu)
1016{
1017 struct gspca_dev *gspca_dev = priv;
1018
1019 if (!gspca_dev->sd_desc->querymenu)
1020 return -EINVAL;
1021 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1022}
1023
1024static int vidioc_enum_input(struct file *file, void *priv,
1025 struct v4l2_input *input)
1026{
1027 struct gspca_dev *gspca_dev = priv;
1028
1029 if (input->index != 0)
1030 return -EINVAL;
1031 memset(input, 0, sizeof *input);
1032 input->type = V4L2_INPUT_TYPE_CAMERA;
1033 strncpy(input->name, gspca_dev->sd_desc->name,
1034 sizeof input->name);
1035 return 0;
1036}
1037
1038static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1039{
1040 *i = 0;
1041 return 0;
1042}
1043
1044static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1045{
1046 if (i > 0)
1047 return -EINVAL;
1048 return (0);
1049}
1050
1051static int vidioc_reqbufs(struct file *file, void *priv,
1052 struct v4l2_requestbuffers *rb)
1053{
1054 struct gspca_dev *gspca_dev = priv;
d43fa32f 1055 int i, ret = 0;
63eb9546 1056
63eb9546
JFM		 1057 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1058 return -EINVAL;
d43fa32f 1059 switch (rb->memory) {
5b77ae77 1060 case GSPCA_MEMORY_READ: /* (internal call) */
d43fa32f 1061 case V4L2_MEMORY_MMAP:
d43fa32f 1062 case V4L2_MEMORY_USERPTR:
6a7eba24 1063 break;
d43fa32f 1064 default:
63eb9546 1065 return -EINVAL;
d43fa32f 1066 }
e2997a72
HG		 1067 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1068 return -ERESTARTSYS;
d43fa32f 1069
5b77ae77
JFM		 1070 if (gspca_dev->memory != GSPCA_MEMORY_NO
1071 && gspca_dev->memory != rb->memory) {
4aa0d037
JFM		 1072 ret = -EBUSY;
1073 goto out;
1074 }
d43fa32f 1075
5b77ae77
JFM		 1076 /* only one file may do the capture */
1077 if (gspca_dev->capt_file != NULL
1078 && gspca_dev->capt_file != file) {
1079 ret = -EBUSY;
1080 goto out;
1081 }
1082
1083 /* if allocated, the buffers must not be mapped */
1084 for (i = 0; i < gspca_dev->nframes; i++) {
1085 if (gspca_dev->frame[i].vma_use_count) {
ac0d6df6
JFM		 1086 ret = -EBUSY;
1087 goto out;
1088 }
5b77ae77
JFM		 1089 }
1090
1091 /* stop streaming */
1092 if (gspca_dev->streaming) {
1093 mutex_lock(&gspca_dev->usb_lock);
1094 gspca_stream_off(gspca_dev);
1095 mutex_unlock(&gspca_dev->usb_lock);
1096 }
1097
1098 /* free the previous allocated buffers, if any */
1099 if (gspca_dev->nframes != 0) {
1100 frame_free(gspca_dev);
1101 gspca_dev->capt_file = NULL;
1102 }
1103 if (rb->count == 0) /* unrequest */
1104 goto out;
1105 gspca_dev->memory = rb->memory;
1106 ret = frame_alloc(gspca_dev, rb->count);
1107 if (ret == 0) {
1108 rb->count = gspca_dev->nframes;
1109 gspca_dev->capt_file = file;
4aa0d037
JFM		 1110 }
1111out:
63eb9546
JFM		 1112 mutex_unlock(&gspca_dev->queue_lock);
1113 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1114 return ret;
1115}
1116
1117static int vidioc_querybuf(struct file *file, void *priv,
1118 struct v4l2_buffer *v4l2_buf)
1119{
1120 struct gspca_dev *gspca_dev = priv;
1121 struct gspca_frame *frame;
1122
63eb9546
JFM		 1123 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1124 || v4l2_buf->index < 0
1125 || v4l2_buf->index >= gspca_dev->nframes)
1126 return -EINVAL;
1127
1128 frame = &gspca_dev->frame[v4l2_buf->index];
1129 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1130 return 0;
1131}
1132
1133static int vidioc_streamon(struct file *file, void *priv,
1134 enum v4l2_buf_type buf_type)
1135{
1136 struct gspca_dev *gspca_dev = priv;
1137 int ret;
1138
63eb9546
JFM		 1139 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1140 return -EINVAL;
e2997a72
HG		 1141 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1142 return -ERESTARTSYS;
63eb9546
JFM		 1143 if (!gspca_dev->present) {
1144 ret = -ENODEV;
1145 goto out;
1146 }
1147 if (gspca_dev->nframes == 0) {
1148 ret = -EINVAL;
1149 goto out;
1150 }
1151 if (!gspca_dev->streaming) {
1152 ret = gspca_init_transfer(gspca_dev);
1153 if (ret < 0)
1154 goto out;
1155 }
335b3f88 1156#ifdef GSPCA_DEBUG
63eb9546
JFM		 1157 if (gspca_debug & D_STREAM) {
1158 PDEBUG_MODE("stream on OK",
1159 gspca_dev->pixfmt,
1160 gspca_dev->width,
1161 gspca_dev->height);
1162 }
1163#endif
e2997a72 1164 ret = 0;
63eb9546
JFM		 1165out:
1166 mutex_unlock(&gspca_dev->queue_lock);
1167 return ret;
1168}
1169
1170static int vidioc_streamoff(struct file *file, void *priv,
1171 enum v4l2_buf_type buf_type)
1172{
1173 struct gspca_dev *gspca_dev = priv;
5b77ae77 1174 int i, ret;
63eb9546 1175
63eb9546
JFM		 1176 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1177 return -EINVAL;
4aa0d037
JFM		 1178 if (!gspca_dev->streaming)
1179 return 0;
1180 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1181 return -ERESTARTSYS;
5b77ae77
JFM		 1182
1183 /* stop streaming */
4aa0d037
JFM		 1184 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1185 ret = -ERESTARTSYS;
1186 goto out;
63eb9546 1187 }
4aa0d037 1188 gspca_stream_off(gspca_dev);
4aa0d037 1189 mutex_unlock(&gspca_dev->usb_lock);
5b77ae77
JFM		 1190
1191 /* empty the application queues */
1192 for (i = 0; i < gspca_dev->nframes; i++)
1193 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1194 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1195 gspca_dev->last_packet_type = DISCARD_PACKET;
1196 gspca_dev->sequence = 0;
1197 atomic_set(&gspca_dev->nevent, 0);
1198 ret = 0;
4aa0d037
JFM		 1199out:
1200 mutex_unlock(&gspca_dev->queue_lock);
1201 return ret;
63eb9546
JFM		 1202}
1203
1204static int vidioc_g_jpegcomp(struct file *file, void *priv,
1205 struct v4l2_jpegcompression *jpegcomp)
1206{
1207 struct gspca_dev *gspca_dev = priv;
1208 int ret;
1209
1210 if (!gspca_dev->sd_desc->get_jcomp)
1211 return -EINVAL;
e2997a72
HG		 1212 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1213 return -ERESTARTSYS;
63eb9546
JFM		 1214 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1215 mutex_unlock(&gspca_dev->usb_lock);
1216 return ret;
1217}
1218
1219static int vidioc_s_jpegcomp(struct file *file, void *priv,
1220 struct v4l2_jpegcompression *jpegcomp)
1221{
1222 struct gspca_dev *gspca_dev = priv;
1223 int ret;
1224
e2997a72
HG		 1225 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1226 return -ERESTARTSYS;
63eb9546
JFM		 1227 if (!gspca_dev->sd_desc->set_jcomp)
1228 return -EINVAL;
1229 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1230 mutex_unlock(&gspca_dev->usb_lock);
1231 return ret;
1232}
1233
1234static int vidioc_g_parm(struct file *filp, void *priv,
1235 struct v4l2_streamparm *parm)
1236{
1237 struct gspca_dev *gspca_dev = priv;
1238
6a7eba24 1239 memset(parm, 0, sizeof *parm);
63eb9546
JFM		 1240 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1241 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1242 return 0;
1243}
1244
1245static int vidioc_s_parm(struct file *filp, void *priv,
1246 struct v4l2_streamparm *parm)
1247{
1248 struct gspca_dev *gspca_dev = priv;
1249 int n;
1250
63eb9546
JFM		 1251 n = parm->parm.capture.readbuffers;
1252 if (n == 0 || n > GSPCA_MAX_FRAMES)
1253 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1254 else
1255 gspca_dev->nbufread = n;
63eb9546
JFM		 1256 return 0;
1257}
1258
6a7eba24
JFM		 1259static int vidioc_s_std(struct file *filp, void *priv,
1260 v4l2_std_id *parm)
1261{
1262 return 0;
1263}
1264
63eb9546
JFM		 1265#ifdef CONFIG_VIDEO_V4L1_COMPAT
1266static int vidiocgmbuf(struct file *file, void *priv,
1267 struct video_mbuf *mbuf)
1268{
1269 struct gspca_dev *gspca_dev = file->private_data;
1270 int i;
1271
1272 PDEBUG(D_STREAM, "cgmbuf");
1273 if (gspca_dev->nframes == 0) {
63eb9546 1274 int ret;
6a7eba24
JFM		 1275
1276 {
1277 struct v4l2_format fmt;
1278
1279 memset(&fmt, 0, sizeof fmt);
1280 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1281 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1282 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1283 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1284 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
e078770a 1285 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
6a7eba24
JFM		 1286 if (ret != 0)
1287 return ret;
1288 }
1289 {
1290 struct v4l2_requestbuffers rb;
1291
1292 memset(&rb, 0, sizeof rb);
1293 rb.count = 4;
1294 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1295 rb.memory = V4L2_MEMORY_MMAP;
1296 ret = vidioc_reqbufs(file, priv, &rb);
1297 if (ret != 0)
1298 return ret;
1299 }
63eb9546
JFM		 1300 }
1301 mbuf->frames = gspca_dev->nframes;
1302 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1303 for (i = 0; i < mbuf->frames; i++)
1304 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1305 return 0;
1306}
1307#endif
1308
1309static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1310{
1311 struct gspca_dev *gspca_dev = file->private_data;
efab8211 1312 struct gspca_frame *frame;
63eb9546
JFM		 1313 struct page *page;
1314 unsigned long addr, start, size;
1315 int i, ret;
63eb9546
JFM		 1316
1317 start = vma->vm_start;
1318 size = vma->vm_end - vma->vm_start;
1319 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1320
e2997a72
HG		 1321 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1322 return -ERESTARTSYS;
63eb9546
JFM		 1323 if (!gspca_dev->present) {
1324 ret = -ENODEV;
4aa0d037
JFM		 1325 goto out;
1326 }
1327 if (gspca_dev->capt_file != file) {
1328 ret = -EINVAL;
1329 goto out;
63eb9546
JFM		 1330 }
1331
efab8211 1332 frame = NULL;
63eb9546
JFM		 1333 for (i = 0; i < gspca_dev->nframes; ++i) {
1334 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1335 PDEBUG(D_STREAM, "mmap bad memory type");
1336 break;
1337 }
1338 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1339 == vma->vm_pgoff) {
1340 frame = &gspca_dev->frame[i];
1341 break;
1342 }
1343 }
efab8211 1344 if (frame == NULL) {
63eb9546
JFM		 1345 PDEBUG(D_STREAM, "mmap no frame buffer found");
1346 ret = -EINVAL;
4aa0d037 1347 goto out;
63eb9546
JFM		 1348 }
1349#ifdef CONFIG_VIDEO_V4L1_COMPAT
ac0d6df6
JFM		 1350 /* v4l1 maps all the buffers */
1351 if (i != 0
1352 || size != frame->v4l2_buf.length * gspca_dev->nframes)
63eb9546 1353#endif
ac0d6df6 1354 if (size != frame->v4l2_buf.length) {
63eb9546
JFM		 1355 PDEBUG(D_STREAM, "mmap bad size");
1356 ret = -EINVAL;
4aa0d037 1357 goto out;
63eb9546
JFM		 1358 }
1359
1360 /*
1361 * - VM_IO marks the area as being a mmaped region for I/O to a
1362 * device. It also prevents the region from being core dumped.
1363 */
1364 vma->vm_flags |= VM_IO;
1365
1366 addr = (unsigned long) frame->data;
1367 while (size > 0) {
1368 page = vmalloc_to_page((void *) addr);
1369 ret = vm_insert_page(vma, start, page);
1370 if (ret < 0)
4aa0d037 1371 goto out;
63eb9546
JFM		 1372 start += PAGE_SIZE;
1373 addr += PAGE_SIZE;
1374 size -= PAGE_SIZE;
1375 }
1376
1377 vma->vm_ops = &gspca_vm_ops;
1378 vma->vm_private_data = frame;
1379 gspca_vm_open(vma);
e2997a72 1380 ret = 0;
4aa0d037 1381out:
63eb9546
JFM		 1382 mutex_unlock(&gspca_dev->queue_lock);
1383 return ret;
1384}
1385
63eb9546
JFM		 1386/*
1387 * wait for a video frame
1388 *
1389 * If a frame is ready, its index is returned.
1390 */
d43fa32f 1391static int frame_wait(struct gspca_dev *gspca_dev,
63eb9546
JFM		 1392 int nonblock_ing)
1393{
1394 struct gspca_frame *frame;
1395 int i, j, ret;
1396
d43fa32f 1397 /* check if a frame is ready */
63eb9546
JFM		 1398 i = gspca_dev->fr_o;
1399 j = gspca_dev->fr_queue[i];
1400 frame = &gspca_dev->frame[j];
82643d0e
JFM		 1401 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1402 atomic_dec(&gspca_dev->nevent);
63eb9546 1403 goto ok;
82643d0e 1404 }
63eb9546
JFM		 1405 if (nonblock_ing) /* no frame yet */
1406 return -EAGAIN;
1407
1408 /* wait till a frame is ready */
1409 for (;;) {
4aa0d037
JFM		 1410 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1411 atomic_read(&gspca_dev->nevent) > 0,
1412 msecs_to_jiffies(3000));
1413 if (ret <= 0) {
1414 if (ret < 0)
82643d0e
JFM		 1415 return ret; /* interrupt */
1416 return -EIO; /* timeout */
4aa0d037 1417 }
82643d0e 1418 atomic_dec(&gspca_dev->nevent);
e2997a72
HG		 1419 if (!gspca_dev->streaming || !gspca_dev->present)
1420 return -EIO;
63eb9546
JFM		 1421 i = gspca_dev->fr_o;
1422 j = gspca_dev->fr_queue[i];
1423 frame = &gspca_dev->frame[j];
1424 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1425 break;
1426 }
63eb9546 1427ok:
63eb9546
JFM		 1428 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1429 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1430 gspca_dev->fr_q,
1431 gspca_dev->fr_i,
1432 gspca_dev->fr_o);
e2997a72 1433
739570bb
JFM		 1434 if (gspca_dev->sd_desc->dq_callback) {
1435 mutex_lock(&gspca_dev->usb_lock);
e2997a72 1436 gspca_dev->sd_desc->dq_callback(gspca_dev);
739570bb
JFM		 1437 mutex_unlock(&gspca_dev->usb_lock);
1438 }
63eb9546
JFM		 1439 return j;
1440}
1441
1442/*
1443 * dequeue a video buffer
1444 *
1445 * If nonblock_ing is false, block until a buffer is available.
1446 */
1447static int vidioc_dqbuf(struct file *file, void *priv,
1448 struct v4l2_buffer *v4l2_buf)
1449{
1450 struct gspca_dev *gspca_dev = priv;
1451 struct gspca_frame *frame;
1452 int i, ret;
1453
1454 PDEBUG(D_FRAM, "dqbuf");
ac0d6df6
JFM		 1455 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1456 return -EINVAL;
1457 if (v4l2_buf->memory != gspca_dev->memory)
63eb9546 1458 return -EINVAL;
5b77ae77
JFM		 1459
1460 /* if not streaming, be sure the application will not loop forever */
1461 if (!(file->f_flags & O_NONBLOCK)
1462 && !gspca_dev->streaming && gspca_dev->users == 1)
63eb9546
JFM		 1463 return -EINVAL;
1464
5b77ae77
JFM		 1465 /* only the capturing file may dequeue */
1466 if (gspca_dev->capt_file != file)
1467 return -EINVAL;
1468
1469 /* only one dequeue / read at a time */
63eb9546
JFM		 1470 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1471 return -ERESTARTSYS;
1472
d43fa32f 1473 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
63eb9546 1474 if (ret < 0)
4aa0d037 1475 goto out;
63eb9546
JFM		 1476 i = ret; /* frame index */
1477 frame = &gspca_dev->frame[i];
ac0d6df6 1478 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
c6eb8eaf 1479 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
ac0d6df6
JFM		 1480 frame->data,
1481 frame->v4l2_buf.bytesused)) {
1482 PDEBUG(D_ERR|D_STREAM,
1483 "dqbuf cp to user failed");
1484 ret = -EFAULT;
1485 goto out;
1486 }
1487 }
63eb9546
JFM		 1488 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1489 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1490 PDEBUG(D_FRAM, "dqbuf %d", i);
1491 ret = 0;
4aa0d037 1492out:
63eb9546
JFM		 1493 mutex_unlock(&gspca_dev->read_lock);
1494 return ret;
1495}
1496
1497/*
1498 * queue a video buffer
1499 *
1500 * Attempting to queue a buffer that has already been
1501 * queued will return -EINVAL.
1502 */
1503static int vidioc_qbuf(struct file *file, void *priv,
1504 struct v4l2_buffer *v4l2_buf)
1505{
1506 struct gspca_dev *gspca_dev = priv;
1507 struct gspca_frame *frame;
1508 int i, index, ret;
1509
1510 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1511 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1512 return -EINVAL;
1513
5b77ae77
JFM		 1514 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1515 return -ERESTARTSYS;
1516
63eb9546
JFM		 1517 index = v4l2_buf->index;
1518 if ((unsigned) index >= gspca_dev->nframes) {
d43fa32f 1519 PDEBUG(D_FRAM,
63eb9546 1520 "qbuf idx %d >= %d", index, gspca_dev->nframes);
5b77ae77
JFM		 1521 ret = -EINVAL;
1522 goto out;
63eb9546 1523 }
5b77ae77 1524 if (v4l2_buf->memory != gspca_dev->memory) {
d43fa32f 1525 PDEBUG(D_FRAM, "qbuf bad memory type");
5b77ae77
JFM		 1526 ret = -EINVAL;
1527 goto out;
63eb9546 1528 }
e2997a72 1529
5b77ae77 1530 frame = &gspca_dev->frame[index];
d43fa32f
JFM		 1531 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1532 PDEBUG(D_FRAM, "qbuf bad state");
63eb9546
JFM		 1533 ret = -EINVAL;
1534 goto out;
1535 }
1536
1537 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
d43fa32f 1538/* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
63eb9546 1539
d43fa32f 1540 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
63eb9546
JFM		 1541 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1542 frame->v4l2_buf.length = v4l2_buf->length;
1543 }
1544
1545 /* put the buffer in the 'queued' queue */
1546 i = gspca_dev->fr_q;
1547 gspca_dev->fr_queue[i] = index;
1548 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1549 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1550 gspca_dev->fr_q,
1551 gspca_dev->fr_i,
1552 gspca_dev->fr_o);
1553
1554 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1555 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1556 ret = 0;
1557out:
1558 mutex_unlock(&gspca_dev->queue_lock);
1559 return ret;
1560}
1561
d43fa32f
JFM		 1562/*
1563 * allocate the resources for read()
1564 */
1565static int read_alloc(struct gspca_dev *gspca_dev,
1566 struct file *file)
63eb9546 1567{
63eb9546 1568 struct v4l2_buffer v4l2_buf;
d43fa32f 1569 int i, ret;
63eb9546 1570
d43fa32f 1571 PDEBUG(D_STREAM, "read alloc");
63eb9546
JFM		 1572 if (gspca_dev->nframes == 0) {
1573 struct v4l2_requestbuffers rb;
1574
1575 memset(&rb, 0, sizeof rb);
1576 rb.count = gspca_dev->nbufread;
1577 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1578 rb.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1579 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1580 if (ret != 0) {
d43fa32f 1581 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
63eb9546
JFM		 1582 return ret;
1583 }
1584 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1585 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1586 v4l2_buf.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1587 for (i = 0; i < gspca_dev->nbufread; i++) {
1588 v4l2_buf.index = i;
63eb9546
JFM		 1589 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1590 if (ret != 0) {
1591 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1592 return ret;
1593 }
1594 }
d43fa32f
JFM		 1595 gspca_dev->memory = GSPCA_MEMORY_READ;
1596 }
4aa0d037 1597
d43fa32f
JFM		 1598 /* start streaming */
1599 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1600 if (ret != 0)
1601 PDEBUG(D_STREAM, "read streamon err %d", ret);
1602 return ret;
1603}
1604
1605static unsigned int dev_poll(struct file *file, poll_table *wait)
1606{
1607 struct gspca_dev *gspca_dev = file->private_data;
1608 int i, ret;
1609
1610 PDEBUG(D_FRAM, "poll");
1611
1612 poll_wait(file, &gspca_dev->wq, wait);
1613 if (!gspca_dev->present)
1614 return POLLERR;
1615
5b77ae77
JFM		 1616 /* if reqbufs is not done, the user would use read() */
1617 if (gspca_dev->nframes == 0) {
1618 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1619 return POLLERR; /* not the 1st time */
d43fa32f 1620 ret = read_alloc(gspca_dev, file);
5b77ae77
JFM		 1621 if (ret != 0)
1622 return POLLERR;
63eb9546
JFM		 1623 }
1624
d43fa32f
JFM		 1625 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1626 return POLLERR;
1627 if (!gspca_dev->present) {
1628 ret = POLLERR;
1629 goto out;
1630 }
1631
5b77ae77 1632 /* check the next incoming buffer */
d43fa32f
JFM		 1633 i = gspca_dev->fr_o;
1634 i = gspca_dev->fr_queue[i];
1635 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1636 ret = POLLIN | POLLRDNORM; /* something to read */
1637 else
1638 ret = 0;
1639out:
1640 mutex_unlock(&gspca_dev->queue_lock);
1641 return ret;
1642}
1643
1644static ssize_t dev_read(struct file *file, char __user *data,
1645 size_t count, loff_t *ppos)
1646{
1647 struct gspca_dev *gspca_dev = file->private_data;
1648 struct gspca_frame *frame;
1649 struct v4l2_buffer v4l2_buf;
1650 struct timeval timestamp;
82643d0e 1651 int n, ret, ret2;
d43fa32f 1652
a9e11134 1653 PDEBUG(D_FRAM, "read (%zd)", count);
d43fa32f
JFM		 1654 if (!gspca_dev->present)
1655 return -ENODEV;
1656 switch (gspca_dev->memory) {
1657 case GSPCA_MEMORY_NO: /* first time */
1658 ret = read_alloc(gspca_dev, file);
1659 if (ret != 0)
1660 return ret;
1661 break;
1662 case GSPCA_MEMORY_READ:
82643d0e
JFM		 1663 if (gspca_dev->capt_file == file)
1664 break;
1665 /* fall thru */
d43fa32f
JFM		 1666 default:
1667 return -EINVAL;
1668 }
1669
63eb9546
JFM		 1670 /* get a frame */
1671 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1672 timestamp.tv_sec--;
82643d0e
JFM		 1673 n = 2;
1674 for (;;) {
63eb9546
JFM		 1675 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1676 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1677 v4l2_buf.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1678 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1679 if (ret != 0) {
1680 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1681 return ret;
1682 }
1683
1684 /* if the process slept for more than 1 second,
82643d0e 1685 * get anewer frame */
63eb9546 1686 frame = &gspca_dev->frame[v4l2_buf.index];
82643d0e
JFM		 1687 if (--n < 0)
1688 break; /* avoid infinite loop */
63eb9546
JFM		 1689 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1690 break;
1691 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1692 if (ret != 0) {
1693 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1694 return ret;
1695 }
1696 }
1697
1698 /* copy the frame */
ac0d6df6
JFM		 1699 if (count > frame->v4l2_buf.bytesused)
1700 count = frame->v4l2_buf.bytesused;
63eb9546
JFM		 1701 ret = copy_to_user(data, frame->data, count);
1702 if (ret != 0) {
1703 PDEBUG(D_ERR|D_STREAM,
a9e11134 1704 "read cp to user lack %d / %zd", ret, count);
63eb9546
JFM		 1705 ret = -EFAULT;
1706 goto out;
1707 }
1708 ret = count;
1709out:
1710 /* in each case, requeue the buffer */
1711 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1712 if (ret2 != 0)
1713 return ret2;
1714 return ret;
1715}
1716
d43fa32f 1717static void dev_release(struct video_device *vfd)
63eb9546
JFM		 1718{
1719 /* nothing */
1720}
1721
1722static struct file_operations dev_fops = {
1723 .owner = THIS_MODULE,
1724 .open = dev_open,
1725 .release = dev_close,
1726 .read = dev_read,
1727 .mmap = dev_mmap,
1728 .ioctl = video_ioctl2,
6a7eba24
JFM		 1729#ifdef CONFIG_COMPAT
1730 .compat_ioctl = v4l_compat_ioctl32,
1731#endif
63eb9546
JFM		 1732 .llseek = no_llseek,
1733 .poll = dev_poll,
1734};
1735
a399810c 1736static const struct v4l2_ioctl_ops dev_ioctl_ops = {
63eb9546
JFM		 1737 .vidioc_querycap = vidioc_querycap,
1738 .vidioc_dqbuf = vidioc_dqbuf,
1739 .vidioc_qbuf = vidioc_qbuf,
e078770a
MCC		 1740 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1741 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1742 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1743 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
63eb9546
JFM		 1744 .vidioc_streamon = vidioc_streamon,
1745 .vidioc_queryctrl = vidioc_queryctrl,
1746 .vidioc_g_ctrl = vidioc_g_ctrl,
1747 .vidioc_s_ctrl = vidioc_s_ctrl,
1748 .vidioc_querymenu = vidioc_querymenu,
1749 .vidioc_enum_input = vidioc_enum_input,
1750 .vidioc_g_input = vidioc_g_input,
1751 .vidioc_s_input = vidioc_s_input,
1752 .vidioc_reqbufs = vidioc_reqbufs,
1753 .vidioc_querybuf = vidioc_querybuf,
1754 .vidioc_streamoff = vidioc_streamoff,
1755 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1756 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1757 .vidioc_g_parm = vidioc_g_parm,
1758 .vidioc_s_parm = vidioc_s_parm,
6a7eba24 1759 .vidioc_s_std = vidioc_s_std,
63eb9546
JFM		 1760#ifdef CONFIG_VIDEO_V4L1_COMPAT
1761 .vidiocgmbuf = vidiocgmbuf,
1762#endif
1763};
1764
a399810c
HV		 1765static struct video_device gspca_template = {
1766 .name = "gspca main driver",
a399810c
HV		 1767 .fops = &dev_fops,
1768 .ioctl_ops = &dev_ioctl_ops,
1769 .release = dev_release, /* mandatory */
1770 .minor = -1,
1771};
1772
63eb9546
JFM		 1773/*
1774 * probe and create a new gspca device
1775 *
1776 * This function must be called by the sub-driver when it is
1777 * called for probing a new device.
1778 */
1779int gspca_dev_probe(struct usb_interface *intf,
1780 const struct usb_device_id *id,
1781 const struct sd_desc *sd_desc,
d43fa32f
JFM		 1782 int dev_size,
1783 struct module *module)
63eb9546
JFM		 1784{
1785 struct usb_interface_descriptor *interface;
1786 struct gspca_dev *gspca_dev;
1787 struct usb_device *dev = interface_to_usbdev(intf);
1788 int ret;
63eb9546 1789
6a7eba24 1790 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
63eb9546
JFM		 1791
1792 /* we don't handle multi-config cameras */
1793 if (dev->descriptor.bNumConfigurations != 1)
1794 return -ENODEV;
1795 interface = &intf->cur_altsetting->desc;
1796 if (interface->bInterfaceNumber > 0)
1797 return -ENODEV;
1798
1799 /* create the device */
1800 if (dev_size < sizeof *gspca_dev)
1801 dev_size = sizeof *gspca_dev;
1802 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1803 if (gspca_dev == NULL) {
1804 err("couldn't kzalloc gspca struct");
1805 return -EIO;
1806 }
8295d99e
JFM		 1807 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1808 if (!gspca_dev->usb_buf) {
1809 err("out of memory");
1810 ret = -EIO;
1811 goto out;
1812 }
63eb9546
JFM		 1813 gspca_dev->dev = dev;
1814 gspca_dev->iface = interface->bInterfaceNumber;
d43fa32f 1815 gspca_dev->nbalt = intf->num_altsetting;
63eb9546
JFM		 1816 gspca_dev->sd_desc = sd_desc;
1817/* gspca_dev->users = 0; (done by kzalloc) */
1818 gspca_dev->nbufread = 2;
1819
012d6b02 1820 /* configure the subdriver and initialize the USB device */
63eb9546 1821 ret = gspca_dev->sd_desc->config(gspca_dev, id);
012d6b02
JFM		 1822 if (ret < 0)
1823 goto out;
1824 ret = gspca_dev->sd_desc->init(gspca_dev);
63eb9546
JFM		 1825 if (ret < 0)
1826 goto out;
1827 ret = gspca_set_alt0(gspca_dev);
1828 if (ret < 0)
1829 goto out;
1830 gspca_set_default_mode(gspca_dev);
1831
1832 mutex_init(&gspca_dev->usb_lock);
1833 mutex_init(&gspca_dev->read_lock);
1834 mutex_init(&gspca_dev->queue_lock);
1835 init_waitqueue_head(&gspca_dev->wq);
1836
1837 /* init video stuff */
1838 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
5e85e732 1839 gspca_dev->vdev.parent = &dev->dev;
d43fa32f
JFM		 1840 memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1841 gspca_dev->vdev.fops = &gspca_dev->fops;
1842 gspca_dev->fops.owner = module; /* module protection */
ee56a4d3 1843 gspca_dev->present = 1;
63eb9546
JFM		 1844 ret = video_register_device(&gspca_dev->vdev,
1845 VFL_TYPE_GRABBER,
1846 video_nr);
1847 if (ret < 0) {
1848 err("video_register_device err %d", ret);
1849 goto out;
1850 }
1851
63eb9546
JFM		 1852 usb_set_intfdata(intf, gspca_dev);
1853 PDEBUG(D_PROBE, "probe ok");
1854 return 0;
1855out:
8295d99e 1856 kfree(gspca_dev->usb_buf);
63eb9546
JFM		 1857 kfree(gspca_dev);
1858 return ret;
1859}
1860EXPORT_SYMBOL(gspca_dev_probe);
1861
1862/*
1863 * USB disconnection
1864 *
1865 * This function must be called by the sub-driver
1866 * when the device disconnects, after the specific resources are freed.
1867 */
1868void gspca_disconnect(struct usb_interface *intf)
1869{
4aa0d037 1870 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
63eb9546
JFM		 1871
1872 if (!gspca_dev)
1873 return;
1874 gspca_dev->present = 0;
e2997a72
HG		 1875 mutex_lock(&gspca_dev->queue_lock);
1876 mutex_lock(&gspca_dev->usb_lock);
1877 gspca_dev->streaming = 0;
d43fa32f 1878 destroy_urbs(gspca_dev);
63eb9546 1879 mutex_unlock(&gspca_dev->usb_lock);
e2997a72 1880 mutex_unlock(&gspca_dev->queue_lock);
63eb9546
JFM		 1881 while (gspca_dev->users != 0) { /* wait until fully closed */
1882 atomic_inc(&gspca_dev->nevent);
1883 wake_up_interruptible(&gspca_dev->wq); /* wake processes */
1884 schedule();
1885 }
1886/* We don't want people trying to open up the device */
1887 video_unregister_device(&gspca_dev->vdev);
1888/* Free the memory */
8295d99e 1889 kfree(gspca_dev->usb_buf);
63eb9546
JFM		 1890 kfree(gspca_dev);
1891 PDEBUG(D_PROBE, "disconnect complete");
1892}
1893EXPORT_SYMBOL(gspca_disconnect);
1894
6a709749
JFM		 1895#ifdef CONFIG_PM
1896int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1897{
1898 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1899
1900 if (!gspca_dev->streaming)
1901 return 0;
1902 gspca_dev->frozen = 1; /* avoid urb error messages */
012d6b02
JFM		 1903 if (gspca_dev->sd_desc->stopN)
1904 gspca_dev->sd_desc->stopN(gspca_dev);
6a709749
JFM		 1905 destroy_urbs(gspca_dev);
1906 gspca_set_alt0(gspca_dev);
012d6b02
JFM		 1907 if (gspca_dev->sd_desc->stop0)
1908 gspca_dev->sd_desc->stop0(gspca_dev);
6a709749
JFM		 1909 return 0;
1910}
1911EXPORT_SYMBOL(gspca_suspend);
1912
1913int gspca_resume(struct usb_interface *intf)
1914{
1915 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1916
1917 gspca_dev->frozen = 0;
012d6b02
JFM		 1918 gspca_dev->sd_desc->init(gspca_dev);
1919 if (gspca_dev->streaming)
1920 return gspca_init_transfer(gspca_dev);
1e89e2da 1921 return 0;
6a709749
JFM		 1922}
1923EXPORT_SYMBOL(gspca_resume);
1924#endif
dcef3237
HG		 1925/* -- cam driver utility functions -- */
1926
1927/* auto gain and exposure algorithm based on the knee algorithm described here:
1928 http://ytse.tricolour.net/docs/LowLightOptimization.html
1929
1930 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1931 where changed. */
1932int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1933 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1934{
1935 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1936 const struct ctrl *gain_ctrl = NULL;
1937 const struct ctrl *exposure_ctrl = NULL;
1938 const struct ctrl *autogain_ctrl = NULL;
1939 int retval = 0;
1940
1941 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1942 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1943 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1944 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1945 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1946 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1947 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1948 }
1949 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1950 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1951 "on cam without (auto)gain/exposure");
1952 return 0;
1953 }
1954
1955 if (gain_ctrl->get(gspca_dev, &gain) ||
1956 exposure_ctrl->get(gspca_dev, &exposure) ||
1957 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1958 return 0;
1959
1960 orig_gain = gain;
1961 orig_exposure = exposure;
1962
1963 /* If we are of a multiple of deadzone, do multiple steps to reach the
1964 desired lumination fast (with the risc of a slight overshoot) */
1965 steps = abs(desired_avg_lum - avg_lum) / deadzone;
1966
1967 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1968 avg_lum, desired_avg_lum, steps);
1969
1970 for (i = 0; i < steps; i++) {
1971 if (avg_lum > desired_avg_lum) {
1972 if (gain > gain_knee)
1973 gain--;
1974 else if (exposure > exposure_knee)
1975 exposure--;
1976 else if (gain > gain_ctrl->qctrl.default_value)
1977 gain--;
1978 else if (exposure > exposure_ctrl->qctrl.minimum)
1979 exposure--;
1980 else if (gain > gain_ctrl->qctrl.minimum)
1981 gain--;
1982 else
1983 break;
1984 } else {
1985 if (gain < gain_ctrl->qctrl.default_value)
1986 gain++;
1987 else if (exposure < exposure_knee)
1988 exposure++;
1989 else if (gain < gain_knee)
1990 gain++;
1991 else if (exposure < exposure_ctrl->qctrl.maximum)
1992 exposure++;
1993 else if (gain < gain_ctrl->qctrl.maximum)
1994 gain++;
1995 else
1996 break;
1997 }
1998 }
1999
2000 if (gain != orig_gain) {
2001 gain_ctrl->set(gspca_dev, gain);
2002 retval = 1;
2003 }
2004 if (exposure != orig_exposure) {
2005 exposure_ctrl->set(gspca_dev, exposure);
2006 retval = 1;
2007 }
2008
2009 return retval;
2010}
2011EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2012
63eb9546
JFM		 2013/* -- module insert / remove -- */
2014static int __init gspca_init(void)
2015{
bb64e86c
JFM		 2016 info("main v%d.%d.%d registered",
2017 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2018 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2019 DRIVER_VERSION_NUMBER & 0xff);
63eb9546
JFM		 2020 return 0;
2021}
2022static void __exit gspca_exit(void)
2023{
2024 info("main deregistered");
2025}
2026
2027module_init(gspca_init);
2028module_exit(gspca_exit);
2029
335b3f88 2030#ifdef GSPCA_DEBUG
63eb9546
JFM		 2031module_param_named(debug, gspca_debug, int, 0644);
2032MODULE_PARM_DESC(debug,
2033 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
d43fa32f
JFM		 2034 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2035 " 0x0100: v4l2");
6a7eba24 2036#endif
Linux kernel - Deliverables
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