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V4L/DVB (9703): Move the s5k4aa vflip quirk table to the main sensor file in order...
[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>
cf0fe08d 24#include <linux/version.h>
63eb9546
JFM		 25#include <linux/fs.h>
26#include <linux/vmalloc.h>
27#include <linux/sched.h>
28#include <linux/slab.h>
29#include <linux/mm.h>
30#include <linux/string.h>
31#include <linux/pagemap.h>
956e42d2 32#include <linux/io.h>
6b060ffe 33#include <linux/kref.h>
63eb9546 34#include <asm/page.h>
956e42d2 35#include <linux/uaccess.h>
63eb9546 36#include <linux/jiffies.h>
35ea11ff 37#include <media/v4l2-ioctl.h>
63eb9546
JFM		 38
39#include "gspca.h"
40
d43fa32f 41/* global values */
ac0d6df6 42#define DEF_NURBS 2 /* default number of URBs */
d43fa32f 43
63eb9546
JFM		 44MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
45MODULE_DESCRIPTION("GSPCA USB Camera Driver");
46MODULE_LICENSE("GPL");
47
240d3ad8 48#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 4, 0)
63eb9546
JFM		 49
50static int video_nr = -1;
51
335b3f88 52#ifdef GSPCA_DEBUG
63eb9546
JFM		 53int gspca_debug = D_ERR | D_PROBE;
54EXPORT_SYMBOL(gspca_debug);
55
56static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57{
58 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60 txt,
61 pixfmt & 0xff,
62 (pixfmt >> 8) & 0xff,
63 (pixfmt >> 16) & 0xff,
64 pixfmt >> 24,
65 w, h);
66 } else {
67 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68 txt,
69 pixfmt,
70 w, h);
71 }
72}
73#else
74#define PDEBUG_MODE(txt, pixfmt, w, h)
75#endif
76
d43fa32f
JFM		 77/* specific memory types - !! should different from V4L2_MEMORY_xxx */
78#define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
79#define GSPCA_MEMORY_READ 7
80
d43fa32f 81#define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
d43fa32f 82
63eb9546
JFM		 83/*
84 * VMA operations.
85 */
86static void gspca_vm_open(struct vm_area_struct *vma)
87{
88 struct gspca_frame *frame = vma->vm_private_data;
89
90 frame->vma_use_count++;
91 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92}
93
94static void gspca_vm_close(struct vm_area_struct *vma)
95{
96 struct gspca_frame *frame = vma->vm_private_data;
97
98 if (--frame->vma_use_count <= 0)
99 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100}
101
102static struct vm_operations_struct gspca_vm_ops = {
103 .open = gspca_vm_open,
104 .close = gspca_vm_close,
105};
106
1b60e1ad
JFM		 107/* get the current input frame buffer */
108struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109{
110 struct gspca_frame *frame;
111 int i;
112
113 i = gspca_dev->fr_i;
114 i = gspca_dev->fr_queue[i];
115 frame = &gspca_dev->frame[i];
116 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117 != V4L2_BUF_FLAG_QUEUED)
118 return NULL;
119 return frame;
120}
121EXPORT_SYMBOL(gspca_get_i_frame);
122
63eb9546 123/*
d43fa32f 124 * fill a video frame from an URB and resubmit
63eb9546 125 */
d43fa32f
JFM		 126static void fill_frame(struct gspca_dev *gspca_dev,
127 struct urb *urb)
63eb9546 128{
63eb9546 129 struct gspca_frame *frame;
6a7eba24 130 __u8 *data; /* address of data in the iso message */
1b60e1ad 131 int i, len, st;
63eb9546
JFM		 132 cam_pkt_op pkt_scan;
133
6a7eba24 134 if (urb->status != 0) {
62ee8eee 135#ifdef CONFIG_PM
6a709749 136 if (!gspca_dev->frozen)
62ee8eee 137#endif
6a709749 138 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
6a7eba24
JFM		 139 return; /* disconnection ? */
140 }
63eb9546
JFM		 141 pkt_scan = gspca_dev->sd_desc->pkt_scan;
142 for (i = 0; i < urb->number_of_packets; i++) {
143
144 /* check the availability of the frame buffer */
1b60e1ad
JFM		 145 frame = gspca_get_i_frame(gspca_dev);
146 if (!frame) {
63eb9546
JFM		 147 gspca_dev->last_packet_type = DISCARD_PACKET;
148 break;
149 }
150
151 /* check the packet status and length */
152 len = urb->iso_frame_desc[i].actual_length;
ff374747
JFM		 153 if (len == 0) {
154 if (gspca_dev->empty_packet == 0)
155 gspca_dev->empty_packet = 1;
6a7eba24 156 continue;
ff374747 157 }
63eb9546
JFM		 158 st = urb->iso_frame_desc[i].status;
159 if (st) {
6a7eba24
JFM		 160 PDEBUG(D_ERR,
161 "ISOC data error: [%d] len=%d, status=%d",
63eb9546
JFM		 162 i, len, st);
163 gspca_dev->last_packet_type = DISCARD_PACKET;
164 continue;
165 }
63eb9546
JFM		 166
167 /* let the packet be analyzed by the subdriver */
168 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
169 i, urb->iso_frame_desc[i].offset, len);
6a7eba24 170 data = (__u8 *) urb->transfer_buffer
63eb9546
JFM		 171 + urb->iso_frame_desc[i].offset;
172 pkt_scan(gspca_dev, frame, data, len);
173 }
174
175 /* resubmit the URB */
63eb9546
JFM		 176 st = usb_submit_urb(urb, GFP_ATOMIC);
177 if (st < 0)
178 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
179}
180
d43fa32f
JFM		 181/*
182 * ISOC message interrupt from the USB device
183 *
ac0d6df6 184 * Analyse each packet and call the subdriver for copy to the frame buffer.
d43fa32f 185 */
ac0d6df6 186static void isoc_irq(struct urb *urb
6a7eba24 187)
d43fa32f
JFM		 188{
189 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
190
3647fea8 191 PDEBUG(D_PACK, "isoc irq");
d43fa32f
JFM		 192 if (!gspca_dev->streaming)
193 return;
194 fill_frame(gspca_dev, urb);
195}
196
0be01004
JFM		 197/*
198 * bulk message interrupt from the USB device
199 */
200static void bulk_irq(struct urb *urb
201)
202{
203 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
204 struct gspca_frame *frame;
dff369aa 205 int st;
0be01004
JFM		 206
207 PDEBUG(D_PACK, "bulk irq");
208 if (!gspca_dev->streaming)
209 return;
880ae24d
JFM		 210 switch (urb->status) {
211 case 0:
212 break;
213 case -ECONNRESET:
214 urb->status = 0;
215 break;
216 default:
0be01004
JFM		 217#ifdef CONFIG_PM
218 if (!gspca_dev->frozen)
219#endif
220 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
221 return; /* disconnection ? */
222 }
223
224 /* check the availability of the frame buffer */
1b60e1ad
JFM		 225 frame = gspca_get_i_frame(gspca_dev);
226 if (!frame) {
0be01004
JFM		 227 gspca_dev->last_packet_type = DISCARD_PACKET;
228 } else {
229 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
230 gspca_dev->sd_desc->pkt_scan(gspca_dev,
231 frame,
232 urb->transfer_buffer,
233 urb->actual_length);
234 }
dff369aa
AO		 235
236 /* resubmit the URB */
237 if (gspca_dev->cam.bulk_nurbs != 0) {
238 st = usb_submit_urb(urb, GFP_ATOMIC);
239 if (st < 0)
240 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
241 }
0be01004
JFM		 242}
243
63eb9546
JFM		 244/*
245 * add data to the current frame
246 *
ac0d6df6
JFM		 247 * This function is called by the subdrivers at interrupt level.
248 *
63eb9546
JFM		 249 * To build a frame, these ones must add
250 * - one FIRST_PACKET
251 * - 0 or many INTER_PACKETs
252 * - one LAST_PACKET
253 * DISCARD_PACKET invalidates the whole frame.
254 * On LAST_PACKET, a new frame is returned.
255 */
256struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
e293e599 257 enum gspca_packet_type packet_type,
63eb9546 258 struct gspca_frame *frame,
a5ae2062 259 const __u8 *data,
63eb9546
JFM		 260 int len)
261{
262 int i, j;
263
e2997a72 264 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
63eb9546
JFM		 265
266 /* when start of a new frame, if the current frame buffer
267 * is not queued, discard the whole frame */
268 if (packet_type == FIRST_PACKET) {
d43fa32f
JFM		 269 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
270 != V4L2_BUF_FLAG_QUEUED) {
63eb9546
JFM		 271 gspca_dev->last_packet_type = DISCARD_PACKET;
272 return frame;
273 }
274 frame->data_end = frame->data;
275 jiffies_to_timeval(get_jiffies_64(),
276 &frame->v4l2_buf.timestamp);
277 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
d43fa32f 278 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
06ca78fa
JFM		 279 if (packet_type == LAST_PACKET)
280 gspca_dev->last_packet_type = packet_type;
63eb9546 281 return frame;
d43fa32f 282 }
63eb9546 283
d43fa32f 284 /* append the packet to the frame buffer */
63eb9546
JFM		 285 if (len > 0) {
286 if (frame->data_end - frame->data + len
287 > frame->v4l2_buf.length) {
a9e11134 288 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
63eb9546
JFM		 289 frame->data_end - frame->data + len,
290 frame->v4l2_buf.length);
291 packet_type = DISCARD_PACKET;
292 } else {
ac0d6df6 293 memcpy(frame->data_end, data, len);
63eb9546
JFM		 294 frame->data_end += len;
295 }
296 }
297 gspca_dev->last_packet_type = packet_type;
298
219423c1 299 /* if last packet, wake up the application and advance in the queue */
63eb9546
JFM		 300 if (packet_type == LAST_PACKET) {
301 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
302 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
303 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
304 atomic_inc(&gspca_dev->nevent);
305 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
d43fa32f
JFM		 306 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
307 gspca_dev->fr_i = i;
63eb9546
JFM		 308 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
309 frame->v4l2_buf.bytesused,
310 gspca_dev->fr_q,
311 i,
312 gspca_dev->fr_o);
313 j = gspca_dev->fr_queue[i];
314 frame = &gspca_dev->frame[j];
63eb9546
JFM		 315 }
316 return frame;
317}
318EXPORT_SYMBOL(gspca_frame_add);
319
320static int gspca_is_compressed(__u32 format)
321{
322 switch (format) {
323 case V4L2_PIX_FMT_MJPEG:
324 case V4L2_PIX_FMT_JPEG:
50a871fe 325 case V4L2_PIX_FMT_SPCA561:
ab8f12cf 326 case V4L2_PIX_FMT_PAC207:
63eb9546
JFM		 327 return 1;
328 }
329 return 0;
330}
331
332static void *rvmalloc(unsigned long size)
333{
334 void *mem;
335 unsigned long adr;
336
63eb9546 337 mem = vmalloc_32(size);
efab8211 338 if (mem != NULL) {
63eb9546
JFM		 339 adr = (unsigned long) mem;
340 while ((long) size > 0) {
341 SetPageReserved(vmalloc_to_page((void *) adr));
342 adr += PAGE_SIZE;
343 size -= PAGE_SIZE;
344 }
345 }
346 return mem;
347}
348
ac0d6df6 349static void rvfree(void *mem, long size)
63eb9546
JFM		 350{
351 unsigned long adr;
352
63eb9546 353 adr = (unsigned long) mem;
ac0d6df6 354 while (size > 0) {
63eb9546
JFM		 355 ClearPageReserved(vmalloc_to_page((void *) adr));
356 adr += PAGE_SIZE;
357 size -= PAGE_SIZE;
358 }
359 vfree(mem);
360}
361
362static int frame_alloc(struct gspca_dev *gspca_dev,
d43fa32f 363 unsigned int count)
63eb9546 364{
d43fa32f
JFM		 365 struct gspca_frame *frame;
366 unsigned int frsz;
367 int i;
63eb9546 368
c2446b3e
JFM		 369 i = gspca_dev->curr_mode;
370 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
63eb9546 371 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
63eb9546 372 frsz = PAGE_ALIGN(frsz);
63eb9546 373 gspca_dev->frsz = frsz;
c2446b3e
JFM		 374 if (count > GSPCA_MAX_FRAMES)
375 count = GSPCA_MAX_FRAMES;
ac0d6df6
JFM		 376 gspca_dev->frbuf = rvmalloc(frsz * count);
377 if (!gspca_dev->frbuf) {
378 err("frame alloc failed");
379 return -ENOMEM;
63eb9546
JFM		 380 }
381 gspca_dev->nframes = count;
382 for (i = 0; i < count; i++) {
d43fa32f
JFM		 383 frame = &gspca_dev->frame[i];
384 frame->v4l2_buf.index = i;
385 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
386 frame->v4l2_buf.flags = 0;
387 frame->v4l2_buf.field = V4L2_FIELD_NONE;
388 frame->v4l2_buf.length = frsz;
389 frame->v4l2_buf.memory = gspca_dev->memory;
390 frame->v4l2_buf.sequence = 0;
ac0d6df6 391 frame->data = frame->data_end =
d43fa32f 392 gspca_dev->frbuf + i * frsz;
ac0d6df6 393 frame->v4l2_buf.m.offset = i * frsz;
63eb9546
JFM		 394 }
395 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
396 gspca_dev->last_packet_type = DISCARD_PACKET;
397 gspca_dev->sequence = 0;
398 atomic_set(&gspca_dev->nevent, 0);
d43fa32f 399 return 0;
63eb9546
JFM		 400}
401
402static void frame_free(struct gspca_dev *gspca_dev)
403{
404 int i;
405
406 PDEBUG(D_STREAM, "frame free");
efab8211 407 if (gspca_dev->frbuf != NULL) {
63eb9546
JFM		 408 rvfree(gspca_dev->frbuf,
409 gspca_dev->nframes * gspca_dev->frsz);
410 gspca_dev->frbuf = NULL;
411 for (i = 0; i < gspca_dev->nframes; i++)
412 gspca_dev->frame[i].data = NULL;
413 }
414 gspca_dev->nframes = 0;
415}
416
d43fa32f 417static void destroy_urbs(struct gspca_dev *gspca_dev)
63eb9546
JFM		 418{
419 struct urb *urb;
420 unsigned int i;
421
422 PDEBUG(D_STREAM, "kill transfer");
44732819 423 for (i = 0; i < MAX_NURBS; i++) {
4aa0d037 424 urb = gspca_dev->urb[i];
63eb9546 425 if (urb == NULL)
d43fa32f 426 break;
63eb9546 427
4aa0d037 428 gspca_dev->urb[i] = NULL;
63eb9546 429 usb_kill_urb(urb);
efab8211 430 if (urb->transfer_buffer != NULL)
63eb9546
JFM		 431 usb_buffer_free(gspca_dev->dev,
432 urb->transfer_buffer_length,
4aa0d037 433 urb->transfer_buffer,
63eb9546 434 urb->transfer_dma);
63eb9546
JFM		 435 usb_free_urb(urb);
436 }
63eb9546
JFM		 437}
438
439/*
219423c1 440 * look for an input transfer endpoint in an alternate setting
63eb9546 441 */
0be01004
JFM		 442static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
443 __u8 epaddr,
444 __u8 xfer)
63eb9546
JFM		 445{
446 struct usb_host_endpoint *ep;
447 int i, attr;
448
449 epaddr |= USB_DIR_IN;
450 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
451 ep = &alt->endpoint[i];
452 if (ep->desc.bEndpointAddress == epaddr) {
453 attr = ep->desc.bmAttributes
454 & USB_ENDPOINT_XFERTYPE_MASK;
0be01004 455 if (attr == xfer)
63eb9546
JFM		 456 return ep;
457 break;
458 }
459 }
460 return NULL;
461}
462
463/*
219423c1 464 * look for an input (isoc or bulk) endpoint
63eb9546
JFM		 465 *
466 * The endpoint is defined by the subdriver.
467 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
468 * This routine may be called many times when the bandwidth is too small
469 * (the bandwidth is checked on urb submit).
470 */
0be01004 471static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
63eb9546
JFM		 472{
473 struct usb_interface *intf;
474 struct usb_host_endpoint *ep;
475 int i, ret;
476
477 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
6a7eba24 478 ep = NULL;
63eb9546 479 i = gspca_dev->alt; /* previous alt setting */
95d9142c
JFM		 480
481 /* try isoc */
63eb9546 482 while (--i > 0) { /* alt 0 is unusable */
0be01004
JFM		 483 ep = alt_xfer(&intf->altsetting[i],
484 gspca_dev->cam.epaddr,
95d9142c 485 USB_ENDPOINT_XFER_ISOC);
63eb9546
JFM		 486 if (ep)
487 break;
488 }
95d9142c
JFM		 489
490 /* if no isoc, try bulk */
6a7eba24 491 if (ep == NULL) {
95d9142c
JFM		 492 ep = alt_xfer(&intf->altsetting[0],
493 gspca_dev->cam.epaddr,
494 USB_ENDPOINT_XFER_BULK);
495 if (ep == NULL) {
496 err("no transfer endpoint found");
497 return NULL;
498 }
63eb9546 499 }
0be01004 500 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
63eb9546 501 i, ep->desc.bEndpointAddress);
95d9142c
JFM		 502 if (i > 0) {
503 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
504 if (ret < 0) {
505 err("set interface err %d", ret);
506 return NULL;
507 }
63eb9546 508 }
d43fa32f 509 gspca_dev->alt = i; /* memorize the current alt setting */
63eb9546
JFM		 510 return ep;
511}
512
513/*
0be01004 514 * create the URBs for image transfer
63eb9546
JFM		 515 */
516static int create_urbs(struct gspca_dev *gspca_dev,
517 struct usb_host_endpoint *ep)
518{
519 struct urb *urb;
d43fa32f 520 int n, nurbs, i, psize, npkt, bsize;
63eb9546
JFM		 521
522 /* calculate the packet size and the number of packets */
63eb9546 523 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
d43fa32f 524
95d9142c
JFM		 525 if (gspca_dev->alt != 0) { /* isoc */
526
527 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
528 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
0be01004
JFM		 529 npkt = ISO_MAX_SIZE / psize;
530 if (npkt > ISO_MAX_PKT)
531 npkt = ISO_MAX_PKT;
532 bsize = psize * npkt;
533 PDEBUG(D_STREAM,
534 "isoc %d pkts size %d = bsize:%d",
535 npkt, psize, bsize);
51977a8d 536 nurbs = DEF_NURBS;
95d9142c 537 } else { /* bulk */
0be01004 538 npkt = 0;
dff369aa 539 bsize = gspca_dev->cam.bulk_size;
95d9142c
JFM		 540 if (bsize == 0)
541 bsize = psize;
0be01004 542 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
dff369aa
AO		 543 if (gspca_dev->cam.bulk_nurbs != 0)
544 nurbs = gspca_dev->cam.bulk_nurbs;
545 else
546 nurbs = 1;
0be01004
JFM		 547 }
548
6a7eba24 549 gspca_dev->nurbs = nurbs;
d43fa32f 550 for (n = 0; n < nurbs; n++) {
63eb9546
JFM		 551 urb = usb_alloc_urb(npkt, GFP_KERNEL);
552 if (!urb) {
553 err("usb_alloc_urb failed");
0d0548e6 554 destroy_urbs(gspca_dev);
63eb9546
JFM		 555 return -ENOMEM;
556 }
4aa0d037 557 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
63eb9546
JFM		 558 bsize,
559 GFP_KERNEL,
560 &urb->transfer_dma);
561
4aa0d037 562 if (urb->transfer_buffer == NULL) {
63eb9546 563 usb_free_urb(urb);
63eb9546 564 err("usb_buffer_urb failed");
0d0548e6 565 destroy_urbs(gspca_dev);
63eb9546
JFM		 566 return -ENOMEM;
567 }
4aa0d037 568 gspca_dev->urb[n] = urb;
63eb9546
JFM		 569 urb->dev = gspca_dev->dev;
570 urb->context = gspca_dev;
63eb9546 571 urb->transfer_buffer_length = bsize;
0be01004
JFM		 572 if (npkt != 0) { /* ISOC */
573 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
574 ep->desc.bEndpointAddress);
6c49da7f
FZ		 575 urb->transfer_flags = URB_ISO_ASAP
576 | URB_NO_TRANSFER_DMA_MAP;
0be01004
JFM		 577 urb->interval = ep->desc.bInterval;
578 urb->complete = isoc_irq;
579 urb->number_of_packets = npkt;
580 for (i = 0; i < npkt; i++) {
581 urb->iso_frame_desc[i].length = psize;
582 urb->iso_frame_desc[i].offset = psize * i;
583 }
584 } else { /* bulk */
585 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
586 ep->desc.bEndpointAddress),
6c49da7f 587 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
0be01004 588 urb->complete = bulk_irq;
63eb9546
JFM		 589 }
590 }
591 return 0;
592}
593
594/*
595 * start the USB transfer
596 */
597static int gspca_init_transfer(struct gspca_dev *gspca_dev)
598{
63eb9546
JFM		 599 struct usb_host_endpoint *ep;
600 int n, ret;
601
e2997a72
HG		 602 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
603 return -ERESTARTSYS;
63eb9546 604
d43fa32f
JFM		 605 /* set the higher alternate setting and
606 * loop until urb submit succeeds */
607 gspca_dev->alt = gspca_dev->nbalt;
63eb9546 608 for (;;) {
d43fa32f 609 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
0be01004 610 ep = get_ep(gspca_dev);
63eb9546
JFM		 611 if (ep == NULL) {
612 ret = -EIO;
613 goto out;
614 }
615 ret = create_urbs(gspca_dev, ep);
616 if (ret < 0)
617 goto out;
618
8fe2f1d5
JFM		 619 /* clear the bulk endpoint */
620 if (gspca_dev->alt == 0) /* if bulk transfer */
621 usb_clear_halt(gspca_dev->dev,
622 usb_rcvintpipe(gspca_dev->dev,
623 gspca_dev->cam.epaddr));
624
63eb9546 625 /* start the cam */
72ab97ce
JFM		 626 ret = gspca_dev->sd_desc->start(gspca_dev);
627 if (ret < 0) {
628 destroy_urbs(gspca_dev);
629 goto out;
630 }
63eb9546
JFM		 631 gspca_dev->streaming = 1;
632 atomic_set(&gspca_dev->nevent, 0);
633
dff369aa
AO		 634 /* some bulk transfers are started by the subdriver */
635 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
51977a8d
JFM		 636 break;
637
63eb9546 638 /* submit the URBs */
d43fa32f 639 for (n = 0; n < gspca_dev->nurbs; n++) {
4aa0d037 640 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
63eb9546
JFM		 641 if (ret < 0) {
642 PDEBUG(D_ERR|D_STREAM,
643 "usb_submit_urb [%d] err %d", n, ret);
e2997a72 644 gspca_dev->streaming = 0;
d43fa32f 645 destroy_urbs(gspca_dev);
63eb9546
JFM		 646 if (ret == -ENOSPC)
647 break; /* try the previous alt */
648 goto out;
649 }
650 }
651 if (ret >= 0)
652 break;
653 }
654out:
655 mutex_unlock(&gspca_dev->usb_lock);
656 return ret;
657}
658
659static int gspca_set_alt0(struct gspca_dev *gspca_dev)
660{
661 int ret;
662
663 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
664 if (ret < 0)
665 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
666 return ret;
667}
668
219423c1 669/* Note: both the queue and the usb locks should be held when calling this */
63eb9546
JFM		 670static void gspca_stream_off(struct gspca_dev *gspca_dev)
671{
63eb9546 672 gspca_dev->streaming = 0;
d43fa32f 673 atomic_set(&gspca_dev->nevent, 0);
98522a7b
JFM		 674 if (gspca_dev->present
675 && gspca_dev->sd_desc->stopN)
676 gspca_dev->sd_desc->stopN(gspca_dev);
677 destroy_urbs(gspca_dev);
678 gspca_set_alt0(gspca_dev);
679 if (gspca_dev->sd_desc->stop0)
680 gspca_dev->sd_desc->stop0(gspca_dev);
681 PDEBUG(D_STREAM, "stream off OK");
63eb9546
JFM		 682}
683
d43fa32f 684static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
63eb9546
JFM		 685{
686 int i;
687
688 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
689 gspca_dev->curr_mode = i;
690 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
691 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
c2446b3e 692 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
63eb9546
JFM		 693}
694
695static int wxh_to_mode(struct gspca_dev *gspca_dev,
696 int width, int height)
697{
698 int i;
699
d43fa32f
JFM		 700 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
701 if (width >= gspca_dev->cam.cam_mode[i].width
702 && height >= gspca_dev->cam.cam_mode[i].height)
63eb9546
JFM		 703 break;
704 }
63eb9546
JFM		 705 return i;
706}
707
63eb9546
JFM		 708/*
709 * search a mode with the right pixel format
710 */
711static int gspca_get_mode(struct gspca_dev *gspca_dev,
712 int mode,
713 int pixfmt)
714{
715 int modeU, modeD;
716
717 modeU = modeD = mode;
718 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
719 if (--modeD >= 0) {
c2446b3e
JFM		 720 if (gspca_dev->cam.cam_mode[modeD].pixelformat
721 == pixfmt)
63eb9546
JFM		 722 return modeD;
723 }
724 if (++modeU < gspca_dev->cam.nmodes) {
c2446b3e
JFM		 725 if (gspca_dev->cam.cam_mode[modeU].pixelformat
726 == pixfmt)
63eb9546
JFM		 727 return modeU;
728 }
729 }
730 return -EINVAL;
731}
732
e078770a 733static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 734 struct v4l2_fmtdesc *fmtdesc)
735{
736 struct gspca_dev *gspca_dev = priv;
6a7eba24 737 int i, j, index;
63eb9546
JFM		 738 __u32 fmt_tb[8];
739
63eb9546
JFM		 740 /* give an index to each format */
741 index = 0;
742 j = 0;
743 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
c2446b3e 744 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
63eb9546
JFM		 745 j = 0;
746 for (;;) {
747 if (fmt_tb[j] == fmt_tb[index])
748 break;
749 j++;
750 }
751 if (j == index) {
752 if (fmtdesc->index == index)
753 break; /* new format */
754 index++;
80297125 755 if (index >= ARRAY_SIZE(fmt_tb))
63eb9546
JFM		 756 return -EINVAL;
757 }
758 }
759 if (i < 0)
760 return -EINVAL; /* no more format */
761
63eb9546
JFM		 762 fmtdesc->pixelformat = fmt_tb[index];
763 if (gspca_is_compressed(fmt_tb[index]))
764 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
d43fa32f 765 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
63eb9546
JFM		 766 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
767 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
768 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
769 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
770 fmtdesc->description[4] = '\0';
771 return 0;
772}
773
e078770a 774static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 775 struct v4l2_format *fmt)
776{
777 struct gspca_dev *gspca_dev = priv;
c2446b3e 778 int mode;
63eb9546 779
6a7eba24
JFM		 780 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
781 return -EINVAL;
c2446b3e
JFM		 782 mode = gspca_dev->curr_mode;
783 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
784 sizeof fmt->fmt.pix);
63eb9546
JFM		 785 return 0;
786}
787
e078770a 788static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
63eb9546
JFM		 789 struct v4l2_format *fmt)
790{
24c530b4 791 int w, h, mode, mode2;
63eb9546 792
6a7eba24
JFM		 793 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
794 return -EINVAL;
4aa0d037
JFM		 795 w = fmt->fmt.pix.width;
796 h = fmt->fmt.pix.height;
d43fa32f 797
335b3f88 798#ifdef GSPCA_DEBUG
63eb9546
JFM		 799 if (gspca_debug & D_CONF)
800 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
801#endif
802 /* search the closest mode for width and height */
803 mode = wxh_to_mode(gspca_dev, w, h);
804
805 /* OK if right palette */
c2446b3e
JFM		 806 if (gspca_dev->cam.cam_mode[mode].pixelformat
807 != fmt->fmt.pix.pixelformat) {
63eb9546
JFM		 808
809 /* else, search the closest mode with the same pixel format */
810 mode2 = gspca_get_mode(gspca_dev, mode,
811 fmt->fmt.pix.pixelformat);
c2446b3e 812 if (mode2 >= 0)
63eb9546 813 mode = mode2;
c2446b3e
JFM		 814/* else
815 ; * no chance, return this mode */
63eb9546 816 }
c2446b3e
JFM		 817 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
818 sizeof fmt->fmt.pix);
63eb9546
JFM		 819 return mode; /* used when s_fmt */
820}
821
e078770a 822static int vidioc_try_fmt_vid_cap(struct file *file,
63eb9546
JFM		 823 void *priv,
824 struct v4l2_format *fmt)
825{
4aa0d037 826 struct gspca_dev *gspca_dev = priv;
63eb9546
JFM		 827 int ret;
828
e078770a 829 ret = try_fmt_vid_cap(gspca_dev, fmt);
63eb9546
JFM		 830 if (ret < 0)
831 return ret;
832 return 0;
833}
834
e078770a 835static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
63eb9546
JFM		 836 struct v4l2_format *fmt)
837{
838 struct gspca_dev *gspca_dev = priv;
d43fa32f 839 int ret;
63eb9546 840
e2997a72
HG		 841 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
842 return -ERESTARTSYS;
d43fa32f 843
e078770a 844 ret = try_fmt_vid_cap(gspca_dev, fmt);
63eb9546
JFM		 845 if (ret < 0)
846 goto out;
847
d43fa32f
JFM		 848 if (gspca_dev->nframes != 0
849 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
850 ret = -EINVAL;
851 goto out;
852 }
853
50a871fe
JFM		 854 if (ret == gspca_dev->curr_mode) {
855 ret = 0;
63eb9546 856 goto out; /* same mode */
50a871fe 857 }
d43fa32f
JFM		 858
859 if (gspca_dev->streaming) {
860 ret = -EBUSY;
861 goto out;
e2997a72 862 }
4aa0d037
JFM		 863 gspca_dev->width = fmt->fmt.pix.width;
864 gspca_dev->height = fmt->fmt.pix.height;
63eb9546
JFM		 865 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
866 gspca_dev->curr_mode = ret;
d43fa32f 867
d43fa32f 868 ret = 0;
63eb9546
JFM		 869out:
870 mutex_unlock(&gspca_dev->queue_lock);
871 return ret;
872}
873
6b060ffe
FZ		 874static void gspca_delete(struct kref *kref)
875{
876 struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
877
878 PDEBUG(D_STREAM, "device deleted");
879
880 kfree(gspca_dev->usb_buf);
881 kfree(gspca_dev);
882}
883
63eb9546
JFM		 884static int dev_open(struct inode *inode, struct file *file)
885{
886 struct gspca_dev *gspca_dev;
887 int ret;
888
d43fa32f 889 PDEBUG(D_STREAM, "%s open", current->comm);
a12ca6a6 890 gspca_dev = (struct gspca_dev *) video_devdata(file);
e2997a72
HG		 891 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
892 return -ERESTARTSYS;
63eb9546
JFM		 893 if (!gspca_dev->present) {
894 ret = -ENODEV;
895 goto out;
896 }
897
012d6b02 898 if (gspca_dev->users > 4) { /* (arbitrary value) */
63eb9546
JFM		 899 ret = -EBUSY;
900 goto out;
901 }
5c4fa002
JFM		 902
903 /* protect the subdriver against rmmod */
904 if (!try_module_get(gspca_dev->module)) {
905 ret = -ENODEV;
906 goto out;
907 }
908
63eb9546 909 gspca_dev->users++;
6b060ffe
FZ		 910
911 /* one more user */
912 kref_get(&gspca_dev->kref);
913
63eb9546 914 file->private_data = gspca_dev;
335b3f88 915#ifdef GSPCA_DEBUG
63eb9546 916 /* activate the v4l2 debug */
d43fa32f 917 if (gspca_debug & D_V4L2)
a12ca6a6 918 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
9de436cf 919 | V4L2_DEBUG_IOCTL_ARG;
63eb9546 920 else
a12ca6a6 921 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
9de436cf 922 | V4L2_DEBUG_IOCTL_ARG);
63eb9546 923#endif
012d6b02 924 ret = 0;
63eb9546
JFM		 925out:
926 mutex_unlock(&gspca_dev->queue_lock);
927 if (ret != 0)
928 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
929 else
d43fa32f 930 PDEBUG(D_STREAM, "open done");
63eb9546
JFM		 931 return ret;
932}
933
934static int dev_close(struct inode *inode, struct file *file)
935{
936 struct gspca_dev *gspca_dev = file->private_data;
937
d43fa32f 938 PDEBUG(D_STREAM, "%s close", current->comm);
e2997a72
HG		 939 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
940 return -ERESTARTSYS;
941 gspca_dev->users--;
e2997a72 942
5b77ae77 943 /* if the file did the capture, free the streaming resources */
4aa0d037 944 if (gspca_dev->capt_file == file) {
a1e8288b
JFM		 945 if (gspca_dev->streaming) {
946 mutex_lock(&gspca_dev->usb_lock);
947 gspca_stream_off(gspca_dev);
948 mutex_unlock(&gspca_dev->usb_lock);
949 }
4aa0d037 950 frame_free(gspca_dev);
efab8211 951 gspca_dev->capt_file = NULL;
d43fa32f 952 gspca_dev->memory = GSPCA_MEMORY_NO;
4aa0d037 953 }
d43fa32f 954 file->private_data = NULL;
5c4fa002 955 module_put(gspca_dev->module);
63eb9546 956 mutex_unlock(&gspca_dev->queue_lock);
6b060ffe 957
d43fa32f 958 PDEBUG(D_STREAM, "close done");
6b060ffe
FZ		 959
960 kref_put(&gspca_dev->kref, gspca_delete);
961
63eb9546
JFM		 962 return 0;
963}
964
965static int vidioc_querycap(struct file *file, void *priv,
966 struct v4l2_capability *cap)
967{
968 struct gspca_dev *gspca_dev = priv;
969
63eb9546
JFM		 970 memset(cap, 0, sizeof *cap);
971 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
c6edaf16
JFM		 972 if (gspca_dev->dev->product != NULL) {
973 strncpy(cap->card, gspca_dev->dev->product,
974 sizeof cap->card);
975 } else {
976 snprintf(cap->card, sizeof cap->card,
977 "USB Camera (%04x:%04x)",
978 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
979 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
980 }
63eb9546
JFM		 981 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
982 sizeof cap->bus_info);
983 cap->version = DRIVER_VERSION_NUMBER;
984 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
985 | V4L2_CAP_STREAMING
986 | V4L2_CAP_READWRITE;
987 return 0;
988}
989
990static int vidioc_queryctrl(struct file *file, void *priv,
991 struct v4l2_queryctrl *q_ctrl)
992{
993 struct gspca_dev *gspca_dev = priv;
f50ba1be 994 int i, ix;
6a7eba24
JFM		 995 u32 id;
996
f50ba1be 997 ix = -1;
6a7eba24
JFM		 998 id = q_ctrl->id;
999 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1000 id &= V4L2_CTRL_ID_MASK;
1001 id++;
1002 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
0f523c2f 1003 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
f50ba1be
JFM		 1004 continue;
1005 if (ix < 0) {
1006 ix = i;
1007 continue;
6a7eba24 1008 }
f50ba1be
JFM		 1009 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1010 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1011 continue;
1012 ix = i;
6a7eba24 1013 }
6a7eba24 1014 }
63eb9546 1015 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
6a7eba24 1016 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
f50ba1be
JFM		 1017 ix = i;
1018 break;
63eb9546
JFM		 1019 }
1020 }
f50ba1be
JFM		 1021 if (ix < 0)
1022 return -EINVAL;
1023 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1024 sizeof *q_ctrl);
1025 if (gspca_dev->ctrl_dis & (1 << ix))
1026 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1027 return 0;
63eb9546
JFM		 1028}
1029
1030static int vidioc_s_ctrl(struct file *file, void *priv,
1031 struct v4l2_control *ctrl)
1032{
1033 struct gspca_dev *gspca_dev = priv;
a5ae2062 1034 const struct ctrl *ctrls;
63eb9546
JFM		 1035 int i, ret;
1036
63eb9546
JFM		 1037 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1038 i < gspca_dev->sd_desc->nctrls;
1039 i++, ctrls++) {
1040 if (ctrl->id != ctrls->qctrl.id)
1041 continue;
0f523c2f
HG		 1042 if (gspca_dev->ctrl_dis & (1 << i))
1043 return -EINVAL;
63eb9546 1044 if (ctrl->value < ctrls->qctrl.minimum
fcf5cb24 1045 || ctrl->value > ctrls->qctrl.maximum)
63eb9546
JFM		 1046 return -ERANGE;
1047 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
e2997a72
HG		 1048 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1049 return -ERESTARTSYS;
63eb9546
JFM		 1050 ret = ctrls->set(gspca_dev, ctrl->value);
1051 mutex_unlock(&gspca_dev->usb_lock);
1052 return ret;
1053 }
1054 return -EINVAL;
1055}
1056
1057static int vidioc_g_ctrl(struct file *file, void *priv,
1058 struct v4l2_control *ctrl)
1059{
1060 struct gspca_dev *gspca_dev = priv;
1061
a5ae2062 1062 const struct ctrl *ctrls;
63eb9546
JFM		 1063 int i, ret;
1064
1065 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1066 i < gspca_dev->sd_desc->nctrls;
1067 i++, ctrls++) {
1068 if (ctrl->id != ctrls->qctrl.id)
1069 continue;
0f523c2f
HG		 1070 if (gspca_dev->ctrl_dis & (1 << i))
1071 return -EINVAL;
e2997a72
HG		 1072 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1073 return -ERESTARTSYS;
63eb9546
JFM		 1074 ret = ctrls->get(gspca_dev, &ctrl->value);
1075 mutex_unlock(&gspca_dev->usb_lock);
1076 return ret;
1077 }
1078 return -EINVAL;
1079}
1080
1081static int vidioc_querymenu(struct file *file, void *priv,
1082 struct v4l2_querymenu *qmenu)
1083{
1084 struct gspca_dev *gspca_dev = priv;
1085
1086 if (!gspca_dev->sd_desc->querymenu)
1087 return -EINVAL;
1088 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1089}
1090
1091static int vidioc_enum_input(struct file *file, void *priv,
1092 struct v4l2_input *input)
1093{
1094 struct gspca_dev *gspca_dev = priv;
1095
1096 if (input->index != 0)
1097 return -EINVAL;
1098 memset(input, 0, sizeof *input);
1099 input->type = V4L2_INPUT_TYPE_CAMERA;
1100 strncpy(input->name, gspca_dev->sd_desc->name,
1101 sizeof input->name);
1102 return 0;
1103}
1104
1105static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1106{
1107 *i = 0;
1108 return 0;
1109}
1110
1111static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1112{
1113 if (i > 0)
1114 return -EINVAL;
1115 return (0);
1116}
1117
1118static int vidioc_reqbufs(struct file *file, void *priv,
1119 struct v4l2_requestbuffers *rb)
1120{
1121 struct gspca_dev *gspca_dev = priv;
d43fa32f 1122 int i, ret = 0;
63eb9546 1123
63eb9546
JFM		 1124 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1125 return -EINVAL;
d43fa32f 1126 switch (rb->memory) {
5b77ae77 1127 case GSPCA_MEMORY_READ: /* (internal call) */
d43fa32f 1128 case V4L2_MEMORY_MMAP:
d43fa32f 1129 case V4L2_MEMORY_USERPTR:
6a7eba24 1130 break;
d43fa32f 1131 default:
63eb9546 1132 return -EINVAL;
d43fa32f 1133 }
e2997a72
HG		 1134 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1135 return -ERESTARTSYS;
d43fa32f 1136
5b77ae77
JFM		 1137 if (gspca_dev->memory != GSPCA_MEMORY_NO
1138 && gspca_dev->memory != rb->memory) {
4aa0d037
JFM		 1139 ret = -EBUSY;
1140 goto out;
1141 }
d43fa32f 1142
5b77ae77
JFM		 1143 /* only one file may do the capture */
1144 if (gspca_dev->capt_file != NULL
1145 && gspca_dev->capt_file != file) {
1146 ret = -EBUSY;
1147 goto out;
1148 }
1149
1150 /* if allocated, the buffers must not be mapped */
1151 for (i = 0; i < gspca_dev->nframes; i++) {
1152 if (gspca_dev->frame[i].vma_use_count) {
ac0d6df6
JFM		 1153 ret = -EBUSY;
1154 goto out;
1155 }
5b77ae77
JFM		 1156 }
1157
1158 /* stop streaming */
1159 if (gspca_dev->streaming) {
1160 mutex_lock(&gspca_dev->usb_lock);
1161 gspca_stream_off(gspca_dev);
1162 mutex_unlock(&gspca_dev->usb_lock);
1163 }
1164
1165 /* free the previous allocated buffers, if any */
1166 if (gspca_dev->nframes != 0) {
1167 frame_free(gspca_dev);
1168 gspca_dev->capt_file = NULL;
1169 }
1170 if (rb->count == 0) /* unrequest */
1171 goto out;
1172 gspca_dev->memory = rb->memory;
1173 ret = frame_alloc(gspca_dev, rb->count);
1174 if (ret == 0) {
1175 rb->count = gspca_dev->nframes;
1176 gspca_dev->capt_file = file;
4aa0d037
JFM		 1177 }
1178out:
63eb9546
JFM		 1179 mutex_unlock(&gspca_dev->queue_lock);
1180 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1181 return ret;
1182}
1183
1184static int vidioc_querybuf(struct file *file, void *priv,
1185 struct v4l2_buffer *v4l2_buf)
1186{
1187 struct gspca_dev *gspca_dev = priv;
1188 struct gspca_frame *frame;
1189
63eb9546
JFM		 1190 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1191 || v4l2_buf->index < 0
1192 || v4l2_buf->index >= gspca_dev->nframes)
1193 return -EINVAL;
1194
1195 frame = &gspca_dev->frame[v4l2_buf->index];
1196 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1197 return 0;
1198}
1199
1200static int vidioc_streamon(struct file *file, void *priv,
1201 enum v4l2_buf_type buf_type)
1202{
1203 struct gspca_dev *gspca_dev = priv;
1204 int ret;
1205
63eb9546
JFM		 1206 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1207 return -EINVAL;
e2997a72
HG		 1208 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1209 return -ERESTARTSYS;
63eb9546
JFM		 1210 if (!gspca_dev->present) {
1211 ret = -ENODEV;
1212 goto out;
1213 }
1214 if (gspca_dev->nframes == 0) {
1215 ret = -EINVAL;
1216 goto out;
1217 }
1218 if (!gspca_dev->streaming) {
1219 ret = gspca_init_transfer(gspca_dev);
1220 if (ret < 0)
1221 goto out;
1222 }
335b3f88 1223#ifdef GSPCA_DEBUG
63eb9546
JFM		 1224 if (gspca_debug & D_STREAM) {
1225 PDEBUG_MODE("stream on OK",
1226 gspca_dev->pixfmt,
1227 gspca_dev->width,
1228 gspca_dev->height);
1229 }
1230#endif
e2997a72 1231 ret = 0;
63eb9546
JFM		 1232out:
1233 mutex_unlock(&gspca_dev->queue_lock);
1234 return ret;
1235}
1236
1237static int vidioc_streamoff(struct file *file, void *priv,
1238 enum v4l2_buf_type buf_type)
1239{
1240 struct gspca_dev *gspca_dev = priv;
5b77ae77 1241 int i, ret;
63eb9546 1242
63eb9546
JFM		 1243 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1244 return -EINVAL;
4aa0d037
JFM		 1245 if (!gspca_dev->streaming)
1246 return 0;
1247 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1248 return -ERESTARTSYS;
5b77ae77
JFM		 1249
1250 /* stop streaming */
4aa0d037
JFM		 1251 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1252 ret = -ERESTARTSYS;
1253 goto out;
63eb9546 1254 }
4aa0d037 1255 gspca_stream_off(gspca_dev);
4aa0d037 1256 mutex_unlock(&gspca_dev->usb_lock);
5b77ae77
JFM		 1257
1258 /* empty the application queues */
1259 for (i = 0; i < gspca_dev->nframes; i++)
1260 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1261 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1262 gspca_dev->last_packet_type = DISCARD_PACKET;
1263 gspca_dev->sequence = 0;
1264 atomic_set(&gspca_dev->nevent, 0);
1265 ret = 0;
4aa0d037
JFM		 1266out:
1267 mutex_unlock(&gspca_dev->queue_lock);
1268 return ret;
63eb9546
JFM		 1269}
1270
1271static int vidioc_g_jpegcomp(struct file *file, void *priv,
1272 struct v4l2_jpegcompression *jpegcomp)
1273{
1274 struct gspca_dev *gspca_dev = priv;
1275 int ret;
1276
1277 if (!gspca_dev->sd_desc->get_jcomp)
1278 return -EINVAL;
e2997a72
HG		 1279 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1280 return -ERESTARTSYS;
63eb9546
JFM		 1281 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1282 mutex_unlock(&gspca_dev->usb_lock);
1283 return ret;
1284}
1285
1286static int vidioc_s_jpegcomp(struct file *file, void *priv,
1287 struct v4l2_jpegcompression *jpegcomp)
1288{
1289 struct gspca_dev *gspca_dev = priv;
1290 int ret;
1291
63eb9546
JFM		 1292 if (!gspca_dev->sd_desc->set_jcomp)
1293 return -EINVAL;
f86d4a91
JP		 1294 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1295 return -ERESTARTSYS;
63eb9546
JFM		 1296 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1297 mutex_unlock(&gspca_dev->usb_lock);
1298 return ret;
1299}
1300
1301static int vidioc_g_parm(struct file *filp, void *priv,
1302 struct v4l2_streamparm *parm)
1303{
1304 struct gspca_dev *gspca_dev = priv;
1305
6a7eba24 1306 memset(parm, 0, sizeof *parm);
63eb9546
JFM		 1307 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1308 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1309 return 0;
1310}
1311
1312static int vidioc_s_parm(struct file *filp, void *priv,
1313 struct v4l2_streamparm *parm)
1314{
1315 struct gspca_dev *gspca_dev = priv;
1316 int n;
1317
63eb9546
JFM		 1318 n = parm->parm.capture.readbuffers;
1319 if (n == 0 || n > GSPCA_MAX_FRAMES)
1320 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1321 else
1322 gspca_dev->nbufread = n;
63eb9546
JFM		 1323 return 0;
1324}
1325
6a7eba24
JFM		 1326static int vidioc_s_std(struct file *filp, void *priv,
1327 v4l2_std_id *parm)
1328{
1329 return 0;
1330}
1331
63eb9546
JFM		 1332#ifdef CONFIG_VIDEO_V4L1_COMPAT
1333static int vidiocgmbuf(struct file *file, void *priv,
1334 struct video_mbuf *mbuf)
1335{
1336 struct gspca_dev *gspca_dev = file->private_data;
1337 int i;
1338
1339 PDEBUG(D_STREAM, "cgmbuf");
1340 if (gspca_dev->nframes == 0) {
63eb9546 1341 int ret;
6a7eba24
JFM		 1342
1343 {
1344 struct v4l2_format fmt;
1345
1346 memset(&fmt, 0, sizeof fmt);
1347 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1348 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1349 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1350 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1351 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
e078770a 1352 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
6a7eba24
JFM		 1353 if (ret != 0)
1354 return ret;
1355 }
1356 {
1357 struct v4l2_requestbuffers rb;
1358
1359 memset(&rb, 0, sizeof rb);
1360 rb.count = 4;
1361 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1362 rb.memory = V4L2_MEMORY_MMAP;
1363 ret = vidioc_reqbufs(file, priv, &rb);
1364 if (ret != 0)
1365 return ret;
1366 }
63eb9546
JFM		 1367 }
1368 mbuf->frames = gspca_dev->nframes;
1369 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1370 for (i = 0; i < mbuf->frames; i++)
1371 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1372 return 0;
1373}
1374#endif
1375
1376static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1377{
1378 struct gspca_dev *gspca_dev = file->private_data;
efab8211 1379 struct gspca_frame *frame;
63eb9546
JFM		 1380 struct page *page;
1381 unsigned long addr, start, size;
1382 int i, ret;
63eb9546
JFM		 1383
1384 start = vma->vm_start;
1385 size = vma->vm_end - vma->vm_start;
1386 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1387
e2997a72
HG		 1388 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1389 return -ERESTARTSYS;
63eb9546
JFM		 1390 if (!gspca_dev->present) {
1391 ret = -ENODEV;
4aa0d037
JFM		 1392 goto out;
1393 }
1394 if (gspca_dev->capt_file != file) {
1395 ret = -EINVAL;
1396 goto out;
63eb9546
JFM		 1397 }
1398
efab8211 1399 frame = NULL;
63eb9546
JFM		 1400 for (i = 0; i < gspca_dev->nframes; ++i) {
1401 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1402 PDEBUG(D_STREAM, "mmap bad memory type");
1403 break;
1404 }
1405 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1406 == vma->vm_pgoff) {
1407 frame = &gspca_dev->frame[i];
1408 break;
1409 }
1410 }
efab8211 1411 if (frame == NULL) {
63eb9546
JFM		 1412 PDEBUG(D_STREAM, "mmap no frame buffer found");
1413 ret = -EINVAL;
4aa0d037 1414 goto out;
63eb9546
JFM		 1415 }
1416#ifdef CONFIG_VIDEO_V4L1_COMPAT
ac0d6df6
JFM		 1417 /* v4l1 maps all the buffers */
1418 if (i != 0
1419 || size != frame->v4l2_buf.length * gspca_dev->nframes)
63eb9546 1420#endif
ac0d6df6 1421 if (size != frame->v4l2_buf.length) {
63eb9546
JFM		 1422 PDEBUG(D_STREAM, "mmap bad size");
1423 ret = -EINVAL;
4aa0d037 1424 goto out;
63eb9546
JFM		 1425 }
1426
1427 /*
1428 * - VM_IO marks the area as being a mmaped region for I/O to a
1429 * device. It also prevents the region from being core dumped.
1430 */
1431 vma->vm_flags |= VM_IO;
1432
1433 addr = (unsigned long) frame->data;
1434 while (size > 0) {
1435 page = vmalloc_to_page((void *) addr);
1436 ret = vm_insert_page(vma, start, page);
1437 if (ret < 0)
4aa0d037 1438 goto out;
63eb9546
JFM		 1439 start += PAGE_SIZE;
1440 addr += PAGE_SIZE;
1441 size -= PAGE_SIZE;
1442 }
1443
1444 vma->vm_ops = &gspca_vm_ops;
1445 vma->vm_private_data = frame;
1446 gspca_vm_open(vma);
e2997a72 1447 ret = 0;
4aa0d037 1448out:
63eb9546
JFM		 1449 mutex_unlock(&gspca_dev->queue_lock);
1450 return ret;
1451}
1452
63eb9546
JFM		 1453/*
1454 * wait for a video frame
1455 *
1456 * If a frame is ready, its index is returned.
1457 */
d43fa32f 1458static int frame_wait(struct gspca_dev *gspca_dev,
63eb9546
JFM		 1459 int nonblock_ing)
1460{
1461 struct gspca_frame *frame;
1462 int i, j, ret;
1463
d43fa32f 1464 /* check if a frame is ready */
63eb9546
JFM		 1465 i = gspca_dev->fr_o;
1466 j = gspca_dev->fr_queue[i];
1467 frame = &gspca_dev->frame[j];
82643d0e
JFM		 1468 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1469 atomic_dec(&gspca_dev->nevent);
63eb9546 1470 goto ok;
82643d0e 1471 }
63eb9546
JFM		 1472 if (nonblock_ing) /* no frame yet */
1473 return -EAGAIN;
1474
1475 /* wait till a frame is ready */
1476 for (;;) {
4aa0d037
JFM		 1477 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1478 atomic_read(&gspca_dev->nevent) > 0,
1479 msecs_to_jiffies(3000));
1480 if (ret <= 0) {
1481 if (ret < 0)
82643d0e
JFM		 1482 return ret; /* interrupt */
1483 return -EIO; /* timeout */
4aa0d037 1484 }
82643d0e 1485 atomic_dec(&gspca_dev->nevent);
e2997a72
HG		 1486 if (!gspca_dev->streaming || !gspca_dev->present)
1487 return -EIO;
63eb9546
JFM		 1488 i = gspca_dev->fr_o;
1489 j = gspca_dev->fr_queue[i];
1490 frame = &gspca_dev->frame[j];
1491 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1492 break;
1493 }
63eb9546 1494ok:
63eb9546
JFM		 1495 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1496 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1497 gspca_dev->fr_q,
1498 gspca_dev->fr_i,
1499 gspca_dev->fr_o);
e2997a72 1500
739570bb
JFM		 1501 if (gspca_dev->sd_desc->dq_callback) {
1502 mutex_lock(&gspca_dev->usb_lock);
e2997a72 1503 gspca_dev->sd_desc->dq_callback(gspca_dev);
739570bb
JFM		 1504 mutex_unlock(&gspca_dev->usb_lock);
1505 }
63eb9546
JFM		 1506 return j;
1507}
1508
1509/*
1510 * dequeue a video buffer
1511 *
1512 * If nonblock_ing is false, block until a buffer is available.
1513 */
1514static int vidioc_dqbuf(struct file *file, void *priv,
1515 struct v4l2_buffer *v4l2_buf)
1516{
1517 struct gspca_dev *gspca_dev = priv;
1518 struct gspca_frame *frame;
1519 int i, ret;
1520
1521 PDEBUG(D_FRAM, "dqbuf");
ac0d6df6
JFM		 1522 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1523 return -EINVAL;
1524 if (v4l2_buf->memory != gspca_dev->memory)
63eb9546 1525 return -EINVAL;
5b77ae77
JFM		 1526
1527 /* if not streaming, be sure the application will not loop forever */
1528 if (!(file->f_flags & O_NONBLOCK)
1529 && !gspca_dev->streaming && gspca_dev->users == 1)
63eb9546
JFM		 1530 return -EINVAL;
1531
5b77ae77
JFM		 1532 /* only the capturing file may dequeue */
1533 if (gspca_dev->capt_file != file)
1534 return -EINVAL;
1535
1536 /* only one dequeue / read at a time */
63eb9546
JFM		 1537 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1538 return -ERESTARTSYS;
1539
d43fa32f 1540 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
63eb9546 1541 if (ret < 0)
4aa0d037 1542 goto out;
63eb9546
JFM		 1543 i = ret; /* frame index */
1544 frame = &gspca_dev->frame[i];
ac0d6df6 1545 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
c6eb8eaf 1546 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
ac0d6df6
JFM		 1547 frame->data,
1548 frame->v4l2_buf.bytesused)) {
1549 PDEBUG(D_ERR|D_STREAM,
1550 "dqbuf cp to user failed");
1551 ret = -EFAULT;
1552 goto out;
1553 }
1554 }
63eb9546
JFM		 1555 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1556 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1557 PDEBUG(D_FRAM, "dqbuf %d", i);
1558 ret = 0;
4aa0d037 1559out:
63eb9546
JFM		 1560 mutex_unlock(&gspca_dev->read_lock);
1561 return ret;
1562}
1563
1564/*
1565 * queue a video buffer
1566 *
1567 * Attempting to queue a buffer that has already been
1568 * queued will return -EINVAL.
1569 */
1570static int vidioc_qbuf(struct file *file, void *priv,
1571 struct v4l2_buffer *v4l2_buf)
1572{
1573 struct gspca_dev *gspca_dev = priv;
1574 struct gspca_frame *frame;
1575 int i, index, ret;
1576
1577 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1578 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1579 return -EINVAL;
1580
5b77ae77
JFM		 1581 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1582 return -ERESTARTSYS;
1583
63eb9546
JFM		 1584 index = v4l2_buf->index;
1585 if ((unsigned) index >= gspca_dev->nframes) {
d43fa32f 1586 PDEBUG(D_FRAM,
63eb9546 1587 "qbuf idx %d >= %d", index, gspca_dev->nframes);
5b77ae77
JFM		 1588 ret = -EINVAL;
1589 goto out;
63eb9546 1590 }
5b77ae77 1591 if (v4l2_buf->memory != gspca_dev->memory) {
d43fa32f 1592 PDEBUG(D_FRAM, "qbuf bad memory type");
5b77ae77
JFM		 1593 ret = -EINVAL;
1594 goto out;
63eb9546 1595 }
e2997a72 1596
5b77ae77 1597 frame = &gspca_dev->frame[index];
d43fa32f
JFM		 1598 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1599 PDEBUG(D_FRAM, "qbuf bad state");
63eb9546
JFM		 1600 ret = -EINVAL;
1601 goto out;
1602 }
1603
1604 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
63eb9546 1605
d43fa32f 1606 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
63eb9546
JFM		 1607 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1608 frame->v4l2_buf.length = v4l2_buf->length;
1609 }
1610
1611 /* put the buffer in the 'queued' queue */
1612 i = gspca_dev->fr_q;
1613 gspca_dev->fr_queue[i] = index;
1614 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1615 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1616 gspca_dev->fr_q,
1617 gspca_dev->fr_i,
1618 gspca_dev->fr_o);
1619
1620 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1621 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1622 ret = 0;
1623out:
1624 mutex_unlock(&gspca_dev->queue_lock);
1625 return ret;
1626}
1627
d43fa32f
JFM		 1628/*
1629 * allocate the resources for read()
1630 */
1631static int read_alloc(struct gspca_dev *gspca_dev,
1632 struct file *file)
63eb9546 1633{
63eb9546 1634 struct v4l2_buffer v4l2_buf;
d43fa32f 1635 int i, ret;
63eb9546 1636
d43fa32f 1637 PDEBUG(D_STREAM, "read alloc");
63eb9546
JFM		 1638 if (gspca_dev->nframes == 0) {
1639 struct v4l2_requestbuffers rb;
1640
1641 memset(&rb, 0, sizeof rb);
1642 rb.count = gspca_dev->nbufread;
1643 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1644 rb.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1645 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1646 if (ret != 0) {
d43fa32f 1647 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
63eb9546
JFM		 1648 return ret;
1649 }
1650 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1651 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1652 v4l2_buf.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1653 for (i = 0; i < gspca_dev->nbufread; i++) {
1654 v4l2_buf.index = i;
63eb9546
JFM		 1655 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1656 if (ret != 0) {
1657 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1658 return ret;
1659 }
1660 }
d43fa32f
JFM		 1661 gspca_dev->memory = GSPCA_MEMORY_READ;
1662 }
4aa0d037 1663
d43fa32f
JFM		 1664 /* start streaming */
1665 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1666 if (ret != 0)
1667 PDEBUG(D_STREAM, "read streamon err %d", ret);
1668 return ret;
1669}
1670
1671static unsigned int dev_poll(struct file *file, poll_table *wait)
1672{
1673 struct gspca_dev *gspca_dev = file->private_data;
1674 int i, ret;
1675
1676 PDEBUG(D_FRAM, "poll");
1677
1678 poll_wait(file, &gspca_dev->wq, wait);
1679 if (!gspca_dev->present)
1680 return POLLERR;
1681
5b77ae77
JFM		 1682 /* if reqbufs is not done, the user would use read() */
1683 if (gspca_dev->nframes == 0) {
1684 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1685 return POLLERR; /* not the 1st time */
d43fa32f 1686 ret = read_alloc(gspca_dev, file);
5b77ae77
JFM		 1687 if (ret != 0)
1688 return POLLERR;
63eb9546
JFM		 1689 }
1690
d43fa32f
JFM		 1691 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1692 return POLLERR;
1693 if (!gspca_dev->present) {
1694 ret = POLLERR;
1695 goto out;
1696 }
1697
5b77ae77 1698 /* check the next incoming buffer */
d43fa32f
JFM		 1699 i = gspca_dev->fr_o;
1700 i = gspca_dev->fr_queue[i];
1701 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1702 ret = POLLIN | POLLRDNORM; /* something to read */
1703 else
1704 ret = 0;
1705out:
1706 mutex_unlock(&gspca_dev->queue_lock);
1707 return ret;
1708}
1709
1710static ssize_t dev_read(struct file *file, char __user *data,
1711 size_t count, loff_t *ppos)
1712{
1713 struct gspca_dev *gspca_dev = file->private_data;
1714 struct gspca_frame *frame;
1715 struct v4l2_buffer v4l2_buf;
1716 struct timeval timestamp;
82643d0e 1717 int n, ret, ret2;
d43fa32f 1718
a9e11134 1719 PDEBUG(D_FRAM, "read (%zd)", count);
d43fa32f
JFM		 1720 if (!gspca_dev->present)
1721 return -ENODEV;
1722 switch (gspca_dev->memory) {
1723 case GSPCA_MEMORY_NO: /* first time */
1724 ret = read_alloc(gspca_dev, file);
1725 if (ret != 0)
1726 return ret;
1727 break;
1728 case GSPCA_MEMORY_READ:
82643d0e
JFM		 1729 if (gspca_dev->capt_file == file)
1730 break;
1731 /* fall thru */
d43fa32f
JFM		 1732 default:
1733 return -EINVAL;
1734 }
1735
63eb9546
JFM		 1736 /* get a frame */
1737 jiffies_to_timeval(get_jiffies_64(), &timestamp);
1738 timestamp.tv_sec--;
82643d0e
JFM		 1739 n = 2;
1740 for (;;) {
63eb9546
JFM		 1741 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1742 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ac0d6df6 1743 v4l2_buf.memory = GSPCA_MEMORY_READ;
63eb9546
JFM		 1744 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1745 if (ret != 0) {
1746 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1747 return ret;
1748 }
1749
1750 /* if the process slept for more than 1 second,
219423c1 1751 * get a newer frame */
63eb9546 1752 frame = &gspca_dev->frame[v4l2_buf.index];
82643d0e
JFM		 1753 if (--n < 0)
1754 break; /* avoid infinite loop */
63eb9546
JFM		 1755 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1756 break;
1757 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1758 if (ret != 0) {
1759 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1760 return ret;
1761 }
1762 }
1763
1764 /* copy the frame */
ac0d6df6
JFM		 1765 if (count > frame->v4l2_buf.bytesused)
1766 count = frame->v4l2_buf.bytesused;
63eb9546
JFM		 1767 ret = copy_to_user(data, frame->data, count);
1768 if (ret != 0) {
1769 PDEBUG(D_ERR|D_STREAM,
a9e11134 1770 "read cp to user lack %d / %zd", ret, count);
63eb9546
JFM		 1771 ret = -EFAULT;
1772 goto out;
1773 }
1774 ret = count;
1775out:
1776 /* in each case, requeue the buffer */
1777 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1778 if (ret2 != 0)
1779 return ret2;
1780 return ret;
1781}
1782
63eb9546
JFM		 1783static struct file_operations dev_fops = {
1784 .owner = THIS_MODULE,
1785 .open = dev_open,
1786 .release = dev_close,
1787 .read = dev_read,
1788 .mmap = dev_mmap,
1789 .ioctl = video_ioctl2,
6a7eba24
JFM		 1790#ifdef CONFIG_COMPAT
1791 .compat_ioctl = v4l_compat_ioctl32,
1792#endif
63eb9546
JFM		 1793 .llseek = no_llseek,
1794 .poll = dev_poll,
1795};
1796
a399810c 1797static const struct v4l2_ioctl_ops dev_ioctl_ops = {
63eb9546
JFM		 1798 .vidioc_querycap = vidioc_querycap,
1799 .vidioc_dqbuf = vidioc_dqbuf,
1800 .vidioc_qbuf = vidioc_qbuf,
e078770a
MCC		 1801 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1802 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1803 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1804 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
63eb9546
JFM		 1805 .vidioc_streamon = vidioc_streamon,
1806 .vidioc_queryctrl = vidioc_queryctrl,
1807 .vidioc_g_ctrl = vidioc_g_ctrl,
1808 .vidioc_s_ctrl = vidioc_s_ctrl,
1809 .vidioc_querymenu = vidioc_querymenu,
1810 .vidioc_enum_input = vidioc_enum_input,
1811 .vidioc_g_input = vidioc_g_input,
1812 .vidioc_s_input = vidioc_s_input,
1813 .vidioc_reqbufs = vidioc_reqbufs,
1814 .vidioc_querybuf = vidioc_querybuf,
1815 .vidioc_streamoff = vidioc_streamoff,
1816 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1817 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1818 .vidioc_g_parm = vidioc_g_parm,
1819 .vidioc_s_parm = vidioc_s_parm,
6a7eba24 1820 .vidioc_s_std = vidioc_s_std,
63eb9546
JFM		 1821#ifdef CONFIG_VIDEO_V4L1_COMPAT
1822 .vidiocgmbuf = vidiocgmbuf,
1823#endif
1824};
1825
a399810c
HV		 1826static struct video_device gspca_template = {
1827 .name = "gspca main driver",
a399810c
HV		 1828 .fops = &dev_fops,
1829 .ioctl_ops = &dev_ioctl_ops,
e07a1d8a 1830 .release = video_device_release,
a399810c
HV		 1831 .minor = -1,
1832};
1833
63eb9546
JFM		 1834/*
1835 * probe and create a new gspca device
1836 *
1837 * This function must be called by the sub-driver when it is
1838 * called for probing a new device.
1839 */
1840int gspca_dev_probe(struct usb_interface *intf,
1841 const struct usb_device_id *id,
1842 const struct sd_desc *sd_desc,
d43fa32f
JFM		 1843 int dev_size,
1844 struct module *module)
63eb9546
JFM		 1845{
1846 struct usb_interface_descriptor *interface;
1847 struct gspca_dev *gspca_dev;
1848 struct usb_device *dev = interface_to_usbdev(intf);
1849 int ret;
63eb9546 1850
6a7eba24 1851 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
63eb9546
JFM		 1852
1853 /* we don't handle multi-config cameras */
1854 if (dev->descriptor.bNumConfigurations != 1)
1855 return -ENODEV;
1856 interface = &intf->cur_altsetting->desc;
1857 if (interface->bInterfaceNumber > 0)
1858 return -ENODEV;
1859
1860 /* create the device */
1861 if (dev_size < sizeof *gspca_dev)
1862 dev_size = sizeof *gspca_dev;
1863 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
e293e599 1864 if (!gspca_dev) {
63eb9546 1865 err("couldn't kzalloc gspca struct");
e293e599 1866 return -ENOMEM;
63eb9546 1867 }
6b060ffe 1868 kref_init(&gspca_dev->kref);
8295d99e
JFM		 1869 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1870 if (!gspca_dev->usb_buf) {
1871 err("out of memory");
e293e599 1872 ret = -ENOMEM;
8295d99e
JFM		 1873 goto out;
1874 }
63eb9546
JFM		 1875 gspca_dev->dev = dev;
1876 gspca_dev->iface = interface->bInterfaceNumber;
d43fa32f 1877 gspca_dev->nbalt = intf->num_altsetting;
63eb9546 1878 gspca_dev->sd_desc = sd_desc;
63eb9546 1879 gspca_dev->nbufread = 2;
ff374747 1880 gspca_dev->empty_packet = -1; /* don't check the empty packets */
63eb9546 1881
012d6b02 1882 /* configure the subdriver and initialize the USB device */
63eb9546 1883 ret = gspca_dev->sd_desc->config(gspca_dev, id);
012d6b02
JFM		 1884 if (ret < 0)
1885 goto out;
1886 ret = gspca_dev->sd_desc->init(gspca_dev);
63eb9546
JFM		 1887 if (ret < 0)
1888 goto out;
1889 ret = gspca_set_alt0(gspca_dev);
1890 if (ret < 0)
1891 goto out;
1892 gspca_set_default_mode(gspca_dev);
1893
1894 mutex_init(&gspca_dev->usb_lock);
1895 mutex_init(&gspca_dev->read_lock);
1896 mutex_init(&gspca_dev->queue_lock);
1897 init_waitqueue_head(&gspca_dev->wq);
1898
1899 /* init video stuff */
e07a1d8a
JFM		 1900 gspca_dev->vdev = video_device_alloc();
1901 memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1902 gspca_dev->vdev->parent = &dev->dev;
5c4fa002 1903 gspca_dev->module = module;
ee56a4d3 1904 gspca_dev->present = 1;
a12ca6a6 1905 ret = video_register_device(&gspca_dev->vdev,
63eb9546
JFM		 1906 VFL_TYPE_GRABBER,
1907 video_nr);
1908 if (ret < 0) {
1909 err("video_register_device err %d", ret);
1910 goto out;
1911 }
1912
63eb9546
JFM		 1913 usb_set_intfdata(intf, gspca_dev);
1914 PDEBUG(D_PROBE, "probe ok");
1915 return 0;
1916out:
e07a1d8a
JFM		 1917 kfree(gspca_dev->usb_buf);
1918 kfree(gspca_dev);
63eb9546
JFM		 1919 return ret;
1920}
1921EXPORT_SYMBOL(gspca_dev_probe);
1922
1923/*
1924 * USB disconnection
1925 *
1926 * This function must be called by the sub-driver
1927 * when the device disconnects, after the specific resources are freed.
1928 */
1929void gspca_disconnect(struct usb_interface *intf)
1930{
4aa0d037 1931 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
63eb9546 1932
6b060ffe
FZ		 1933 usb_set_intfdata(intf, NULL);
1934
a12ca6a6
JFM		 1935 /* release the device */
1936 /* (this will call gspca_release() immediatly or on last close) */
1937 video_unregister_device(&gspca_dev->vdev);
3145b8c1 1938
6b060ffe
FZ		 1939 kref_put(&gspca_dev->kref, gspca_delete);
1940
63eb9546
JFM		 1941 PDEBUG(D_PROBE, "disconnect complete");
1942}
1943EXPORT_SYMBOL(gspca_disconnect);
1944
6a709749
JFM		 1945#ifdef CONFIG_PM
1946int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1947{
1948 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1949
1950 if (!gspca_dev->streaming)
1951 return 0;
1952 gspca_dev->frozen = 1; /* avoid urb error messages */
012d6b02
JFM		 1953 if (gspca_dev->sd_desc->stopN)
1954 gspca_dev->sd_desc->stopN(gspca_dev);
6a709749
JFM		 1955 destroy_urbs(gspca_dev);
1956 gspca_set_alt0(gspca_dev);
012d6b02
JFM		 1957 if (gspca_dev->sd_desc->stop0)
1958 gspca_dev->sd_desc->stop0(gspca_dev);
6a709749
JFM		 1959 return 0;
1960}
1961EXPORT_SYMBOL(gspca_suspend);
1962
1963int gspca_resume(struct usb_interface *intf)
1964{
1965 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1966
1967 gspca_dev->frozen = 0;
012d6b02
JFM		 1968 gspca_dev->sd_desc->init(gspca_dev);
1969 if (gspca_dev->streaming)
1970 return gspca_init_transfer(gspca_dev);
1e89e2da 1971 return 0;
6a709749
JFM		 1972}
1973EXPORT_SYMBOL(gspca_resume);
1974#endif
dcef3237
HG		 1975/* -- cam driver utility functions -- */
1976
1977/* auto gain and exposure algorithm based on the knee algorithm described here:
1978 http://ytse.tricolour.net/docs/LowLightOptimization.html
1979
1980 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1981 where changed. */
1982int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1983 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1984{
1985 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1986 const struct ctrl *gain_ctrl = NULL;
1987 const struct ctrl *exposure_ctrl = NULL;
1988 const struct ctrl *autogain_ctrl = NULL;
1989 int retval = 0;
1990
1991 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1992 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1993 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1994 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1995 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1996 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1997 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1998 }
1999 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2000 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2001 "on cam without (auto)gain/exposure");
2002 return 0;
2003 }
2004
2005 if (gain_ctrl->get(gspca_dev, &gain) ||
2006 exposure_ctrl->get(gspca_dev, &exposure) ||
2007 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2008 return 0;
2009
2010 orig_gain = gain;
2011 orig_exposure = exposure;
2012
2013 /* If we are of a multiple of deadzone, do multiple steps to reach the
2014 desired lumination fast (with the risc of a slight overshoot) */
2015 steps = abs(desired_avg_lum - avg_lum) / deadzone;
2016
1c44d81d 2017 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
dcef3237
HG		 2018 avg_lum, desired_avg_lum, steps);
2019
2020 for (i = 0; i < steps; i++) {
2021 if (avg_lum > desired_avg_lum) {
2022 if (gain > gain_knee)
2023 gain--;
2024 else if (exposure > exposure_knee)
2025 exposure--;
2026 else if (gain > gain_ctrl->qctrl.default_value)
2027 gain--;
2028 else if (exposure > exposure_ctrl->qctrl.minimum)
2029 exposure--;
2030 else if (gain > gain_ctrl->qctrl.minimum)
2031 gain--;
2032 else
2033 break;
2034 } else {
2035 if (gain < gain_ctrl->qctrl.default_value)
2036 gain++;
2037 else if (exposure < exposure_knee)
2038 exposure++;
2039 else if (gain < gain_knee)
2040 gain++;
2041 else if (exposure < exposure_ctrl->qctrl.maximum)
2042 exposure++;
2043 else if (gain < gain_ctrl->qctrl.maximum)
2044 gain++;
2045 else
2046 break;
2047 }
2048 }
2049
2050 if (gain != orig_gain) {
2051 gain_ctrl->set(gspca_dev, gain);
2052 retval = 1;
2053 }
2054 if (exposure != orig_exposure) {
2055 exposure_ctrl->set(gspca_dev, exposure);
2056 retval = 1;
2057 }
2058
2059 return retval;
2060}
2061EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2062
63eb9546
JFM		 2063/* -- module insert / remove -- */
2064static int __init gspca_init(void)
2065{
bb64e86c
JFM		 2066 info("main v%d.%d.%d registered",
2067 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2068 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2069 DRIVER_VERSION_NUMBER & 0xff);
63eb9546
JFM		 2070 return 0;
2071}
2072static void __exit gspca_exit(void)
2073{
2074 info("main deregistered");
2075}
2076
2077module_init(gspca_init);
2078module_exit(gspca_exit);
2079
335b3f88 2080#ifdef GSPCA_DEBUG
63eb9546
JFM		 2081module_param_named(debug, gspca_debug, int, 0644);
2082MODULE_PARM_DESC(debug,
2083 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
d43fa32f
JFM		 2084 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2085 " 0x0100: v4l2");
6a7eba24 2086#endif
Linux kernel - Deliverables
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