SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2009 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/version.h>
  25 #include <linux/fs.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/string.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/io.h>
  33 #include <asm/page.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/jiffies.h>
  36 #include <media/v4l2-ioctl.h>
  37
  38 #include "gspca.h"
  39
  40 /* global values */
  41 #define DEF_NURBS 3             /* default number of URBs */
  42 #if DEF_NURBS > MAX_NURBS
  43 #error "DEF_NURBS too big"
  44 #endif
  45
  46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 7, 0)
  51
  52 #ifdef GSPCA_DEBUG
  53 int gspca_debug = D_ERR | D_PROBE;
  54 EXPORT_SYMBOL(gspca_debug);
  55
  56 static 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
  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
  81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  82
  83 /*
  84  * VMA operations.
  85  */
  86 static 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
  94 static 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
 102 static const struct vm_operations_struct gspca_vm_ops = {
 103         .open           = gspca_vm_open,
 104         .close          = gspca_vm_close,
 105 };
 106
 107 /* get the current input frame buffer */
 108 struct 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 }
 121 EXPORT_SYMBOL(gspca_get_i_frame);
 122
 123 /*
 124  * fill a video frame from an URB and resubmit
 125  */
 126 static void fill_frame(struct gspca_dev *gspca_dev,
 127                         struct urb *urb)
 128 {
 129         struct gspca_frame *frame;
 130         u8 *data;               /* address of data in the iso message */
 131         int i, len, st;
 132         cam_pkt_op pkt_scan;
 133
 134         if (urb->status != 0) {
 135                 if (urb->status == -ESHUTDOWN)
 136                         return;         /* disconnection */
 137 #ifdef CONFIG_PM
 138                 if (gspca_dev->frozen)
 139                         return;
 140 #endif
 141                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 142                 goto resubmit;
 143         }
 144         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 145         for (i = 0; i < urb->number_of_packets; i++) {
 146
 147                 /* check the availability of the frame buffer */
 148                 frame = gspca_get_i_frame(gspca_dev);
 149                 if (!frame) {
 150                         gspca_dev->last_packet_type = DISCARD_PACKET;
 151                         break;
 152                 }
 153
 154                 /* check the packet status and length */
 155                 len = urb->iso_frame_desc[i].actual_length;
 156                 if (len == 0) {
 157                         if (gspca_dev->empty_packet == 0)
 158                                 gspca_dev->empty_packet = 1;
 159                         continue;
 160                 }
 161                 st = urb->iso_frame_desc[i].status;
 162                 if (st) {
 163                         PDEBUG(D_ERR,
 164                                 "ISOC data error: [%d] len=%d, status=%d",
 165                                 i, len, st);
 166                         gspca_dev->last_packet_type = DISCARD_PACKET;
 167                         continue;
 168                 }
 169
 170                 /* let the packet be analyzed by the subdriver */
 171                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 172                         i, urb->iso_frame_desc[i].offset, len);
 173                 data = (u8 *) urb->transfer_buffer
 174                                         + urb->iso_frame_desc[i].offset;
 175                 pkt_scan(gspca_dev, frame, data, len);
 176         }
 177
 178 resubmit:
 179         /* resubmit the URB */
 180         st = usb_submit_urb(urb, GFP_ATOMIC);
 181         if (st < 0)
 182                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 183 }
 184
 185 /*
 186  * ISOC message interrupt from the USB device
 187  *
 188  * Analyse each packet and call the subdriver for copy to the frame buffer.
 189  */
 190 static void isoc_irq(struct urb *urb)
 191 {
 192         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 193
 194         PDEBUG(D_PACK, "isoc irq");
 195         if (!gspca_dev->streaming)
 196                 return;
 197         fill_frame(gspca_dev, urb);
 198 }
 199
 200 /*
 201  * bulk message interrupt from the USB device
 202  */
 203 static void bulk_irq(struct urb *urb)
 204 {
 205         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 206         struct gspca_frame *frame;
 207         int st;
 208
 209         PDEBUG(D_PACK, "bulk irq");
 210         if (!gspca_dev->streaming)
 211                 return;
 212         switch (urb->status) {
 213         case 0:
 214                 break;
 215         case -ESHUTDOWN:
 216                 return;         /* disconnection */
 217         case -ECONNRESET:
 218                 urb->status = 0;
 219                 break;
 220         default:
 221 #ifdef CONFIG_PM
 222                 if (gspca_dev->frozen)
 223                         return;
 224 #endif
 225                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 226                 goto resubmit;
 227         }
 228
 229         /* check the availability of the frame buffer */
 230         frame = gspca_get_i_frame(gspca_dev);
 231         if (!frame) {
 232                 gspca_dev->last_packet_type = DISCARD_PACKET;
 233         } else {
 234                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 235                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 236                                         frame,
 237                                         urb->transfer_buffer,
 238                                         urb->actual_length);
 239         }
 240
 241 resubmit:
 242         /* resubmit the URB */
 243         if (gspca_dev->cam.bulk_nurbs != 0) {
 244                 st = usb_submit_urb(urb, GFP_ATOMIC);
 245                 if (st < 0)
 246                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 247         }
 248 }
 249
 250 /*
 251  * add data to the current frame
 252  *
 253  * This function is called by the subdrivers at interrupt level.
 254  *
 255  * To build a frame, these ones must add
 256  *      - one FIRST_PACKET
 257  *      - 0 or many INTER_PACKETs
 258  *      - one LAST_PACKET
 259  * DISCARD_PACKET invalidates the whole frame.
 260  * On LAST_PACKET, a new frame is returned.
 261  */
 262 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 263                                     enum gspca_packet_type packet_type,
 264                                     struct gspca_frame *frame,
 265                                     const __u8 *data,
 266                                     int len)
 267 {
 268         int i, j;
 269
 270         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 271
 272         /* when start of a new frame, if the current frame buffer
 273          * is not queued, discard the whole frame */
 274         if (packet_type == FIRST_PACKET) {
 275                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 276                                                 != V4L2_BUF_FLAG_QUEUED) {
 277                         gspca_dev->last_packet_type = DISCARD_PACKET;
 278                         return frame;
 279                 }
 280                 frame->data_end = frame->data;
 281                 jiffies_to_timeval(get_jiffies_64(),
 282                                    &frame->v4l2_buf.timestamp);
 283                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 284         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 285                 if (packet_type == LAST_PACKET)
 286                         gspca_dev->last_packet_type = packet_type;
 287                 return frame;
 288         }
 289
 290         /* append the packet to the frame buffer */
 291         if (len > 0) {
 292                 if (frame->data_end - frame->data + len
 293                                                  > frame->v4l2_buf.length) {
 294                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 295                                 frame->data_end - frame->data + len,
 296                                 frame->v4l2_buf.length);
 297                         packet_type = DISCARD_PACKET;
 298                 } else {
 299                         memcpy(frame->data_end, data, len);
 300                         frame->data_end += len;
 301                 }
 302         }
 303         gspca_dev->last_packet_type = packet_type;
 304
 305         /* if last packet, wake up the application and advance in the queue */
 306         if (packet_type == LAST_PACKET) {
 307                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 308                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 309                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 310                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 311                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 312                 gspca_dev->fr_i = i;
 313                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 314                         frame->v4l2_buf.bytesused,
 315                         gspca_dev->fr_q,
 316                         i,
 317                         gspca_dev->fr_o);
 318                 j = gspca_dev->fr_queue[i];
 319                 frame = &gspca_dev->frame[j];
 320         }
 321         return frame;
 322 }
 323 EXPORT_SYMBOL(gspca_frame_add);
 324
 325 static int gspca_is_compressed(__u32 format)
 326 {
 327         switch (format) {
 328         case V4L2_PIX_FMT_MJPEG:
 329         case V4L2_PIX_FMT_JPEG:
 330         case V4L2_PIX_FMT_SPCA561:
 331         case V4L2_PIX_FMT_PAC207:
 332         case V4L2_PIX_FMT_MR97310A:
 333                 return 1;
 334         }
 335         return 0;
 336 }
 337
 338 static void *rvmalloc(unsigned long size)
 339 {
 340         void *mem;
 341         unsigned long adr;
 342
 343         mem = vmalloc_32(size);
 344         if (mem != NULL) {
 345                 adr = (unsigned long) mem;
 346                 while ((long) size > 0) {
 347                         SetPageReserved(vmalloc_to_page((void *) adr));
 348                         adr += PAGE_SIZE;
 349                         size -= PAGE_SIZE;
 350                 }
 351         }
 352         return mem;
 353 }
 354
 355 static void rvfree(void *mem, long size)
 356 {
 357         unsigned long adr;
 358
 359         adr = (unsigned long) mem;
 360         while (size > 0) {
 361                 ClearPageReserved(vmalloc_to_page((void *) adr));
 362                 adr += PAGE_SIZE;
 363                 size -= PAGE_SIZE;
 364         }
 365         vfree(mem);
 366 }
 367
 368 static int frame_alloc(struct gspca_dev *gspca_dev,
 369                         unsigned int count)
 370 {
 371         struct gspca_frame *frame;
 372         unsigned int frsz;
 373         int i;
 374
 375         i = gspca_dev->curr_mode;
 376         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 377         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 378         frsz = PAGE_ALIGN(frsz);
 379         gspca_dev->frsz = frsz;
 380         if (count > GSPCA_MAX_FRAMES)
 381                 count = GSPCA_MAX_FRAMES;
 382         gspca_dev->frbuf = rvmalloc(frsz * count);
 383         if (!gspca_dev->frbuf) {
 384                 err("frame alloc failed");
 385                 return -ENOMEM;
 386         }
 387         gspca_dev->nframes = count;
 388         for (i = 0; i < count; i++) {
 389                 frame = &gspca_dev->frame[i];
 390                 frame->v4l2_buf.index = i;
 391                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 392                 frame->v4l2_buf.flags = 0;
 393                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 394                 frame->v4l2_buf.length = frsz;
 395                 frame->v4l2_buf.memory = gspca_dev->memory;
 396                 frame->v4l2_buf.sequence = 0;
 397                 frame->data = frame->data_end =
 398                                         gspca_dev->frbuf + i * frsz;
 399                 frame->v4l2_buf.m.offset = i * frsz;
 400         }
 401         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 402         gspca_dev->last_packet_type = DISCARD_PACKET;
 403         gspca_dev->sequence = 0;
 404         return 0;
 405 }
 406
 407 static void frame_free(struct gspca_dev *gspca_dev)
 408 {
 409         int i;
 410
 411         PDEBUG(D_STREAM, "frame free");
 412         if (gspca_dev->frbuf != NULL) {
 413                 rvfree(gspca_dev->frbuf,
 414                         gspca_dev->nframes * gspca_dev->frsz);
 415                 gspca_dev->frbuf = NULL;
 416                 for (i = 0; i < gspca_dev->nframes; i++)
 417                         gspca_dev->frame[i].data = NULL;
 418         }
 419         gspca_dev->nframes = 0;
 420 }
 421
 422 static void destroy_urbs(struct gspca_dev *gspca_dev)
 423 {
 424         struct urb *urb;
 425         unsigned int i;
 426
 427         PDEBUG(D_STREAM, "kill transfer");
 428         for (i = 0; i < MAX_NURBS; i++) {
 429                 urb = gspca_dev->urb[i];
 430                 if (urb == NULL)
 431                         break;
 432
 433                 gspca_dev->urb[i] = NULL;
 434                 usb_kill_urb(urb);
 435                 if (urb->transfer_buffer != NULL)
 436                         usb_buffer_free(gspca_dev->dev,
 437                                         urb->transfer_buffer_length,
 438                                         urb->transfer_buffer,
 439                                         urb->transfer_dma);
 440                 usb_free_urb(urb);
 441         }
 442 }
 443
 444 /*
 445  * look for an input transfer endpoint in an alternate setting
 446  */
 447 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 448                                           int xfer)
 449 {
 450         struct usb_host_endpoint *ep;
 451         int i, attr;
 452
 453         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 454                 ep = &alt->endpoint[i];
 455                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 456                 if (attr == xfer
 457                     && ep->desc.wMaxPacketSize != 0)
 458                         return ep;
 459         }
 460         return NULL;
 461 }
 462
 463 /*
 464  * look for an input (isoc or bulk) endpoint
 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  */
 471 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 472 {
 473         struct usb_interface *intf;
 474         struct usb_host_endpoint *ep;
 475         int xfer, i, ret;
 476
 477         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 478         ep = NULL;
 479         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 480                                    : USB_ENDPOINT_XFER_ISOC;
 481         i = gspca_dev->alt;                     /* previous alt setting */
 482         if (gspca_dev->cam.reverse_alts) {
 483                 while (++i < gspca_dev->nbalt) {
 484                         ep = alt_xfer(&intf->altsetting[i], xfer);
 485                         if (ep)
 486                                 break;
 487                 }
 488         } else {
 489                 while (--i >= 0) {
 490                         ep = alt_xfer(&intf->altsetting[i], xfer);
 491                         if (ep)
 492                                 break;
 493                 }
 494         }
 495         if (ep == NULL) {
 496                 err("no transfer endpoint found");
 497                 return NULL;
 498         }
 499         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 500                         i, ep->desc.bEndpointAddress);
 501         gspca_dev->alt = i;             /* memorize the current alt setting */
 502         if (gspca_dev->nbalt > 1) {
 503                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 504                 if (ret < 0) {
 505                         err("set alt %d err %d", i, ret);
 506                         return NULL;
 507                 }
 508         }
 509         return ep;
 510 }
 511
 512 /*
 513  * create the URBs for image transfer
 514  */
 515 static int create_urbs(struct gspca_dev *gspca_dev,
 516                         struct usb_host_endpoint *ep)
 517 {
 518         struct urb *urb;
 519         int n, nurbs, i, psize, npkt, bsize;
 520
 521         /* calculate the packet size and the number of packets */
 522         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 523
 524         if (!gspca_dev->cam.bulk) {             /* isoc */
 525
 526                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 527                 if (gspca_dev->pkt_size == 0)
 528                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 529                 else
 530                         psize = gspca_dev->pkt_size;
 531                 npkt = gspca_dev->cam.npkt;
 532                 if (npkt == 0)
 533                         npkt = 32;              /* default value */
 534                 bsize = psize * npkt;
 535                 PDEBUG(D_STREAM,
 536                         "isoc %d pkts size %d = bsize:%d",
 537                         npkt, psize, bsize);
 538                 nurbs = DEF_NURBS;
 539         } else {                                /* bulk */
 540                 npkt = 0;
 541                 bsize = gspca_dev->cam.bulk_size;
 542                 if (bsize == 0)
 543                         bsize = psize;
 544                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 545                 if (gspca_dev->cam.bulk_nurbs != 0)
 546                         nurbs = gspca_dev->cam.bulk_nurbs;
 547                 else
 548                         nurbs = 1;
 549         }
 550
 551         gspca_dev->nurbs = nurbs;
 552         for (n = 0; n < nurbs; n++) {
 553                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 554                 if (!urb) {
 555                         err("usb_alloc_urb failed");
 556                         destroy_urbs(gspca_dev);
 557                         return -ENOMEM;
 558                 }
 559                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 560                                                 bsize,
 561                                                 GFP_KERNEL,
 562                                                 &urb->transfer_dma);
 563
 564                 if (urb->transfer_buffer == NULL) {
 565                         usb_free_urb(urb);
 566                         err("usb_buffer_urb failed");
 567                         destroy_urbs(gspca_dev);
 568                         return -ENOMEM;
 569                 }
 570                 gspca_dev->urb[n] = urb;
 571                 urb->dev = gspca_dev->dev;
 572                 urb->context = gspca_dev;
 573                 urb->transfer_buffer_length = bsize;
 574                 if (npkt != 0) {                /* ISOC */
 575                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 576                                                     ep->desc.bEndpointAddress);
 577                         urb->transfer_flags = URB_ISO_ASAP
 578                                         | URB_NO_TRANSFER_DMA_MAP;
 579                         urb->interval = ep->desc.bInterval;
 580                         urb->complete = isoc_irq;
 581                         urb->number_of_packets = npkt;
 582                         for (i = 0; i < npkt; i++) {
 583                                 urb->iso_frame_desc[i].length = psize;
 584                                 urb->iso_frame_desc[i].offset = psize * i;
 585                         }
 586                 } else {                /* bulk */
 587                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 588                                                 ep->desc.bEndpointAddress),
 589                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 590                         urb->complete = bulk_irq;
 591                 }
 592         }
 593         return 0;
 594 }
 595
 596 /*
 597  * start the USB transfer
 598  */
 599 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 600 {
 601         struct usb_host_endpoint *ep;
 602         int n, ret;
 603
 604         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 605                 return -ERESTARTSYS;
 606
 607         if (!gspca_dev->present) {
 608                 ret = -ENODEV;
 609                 goto out;
 610         }
 611
 612         /* set the higher alternate setting and
 613          * loop until urb submit succeeds */
 614         if (gspca_dev->cam.reverse_alts)
 615                 gspca_dev->alt = 0;
 616         else
 617                 gspca_dev->alt = gspca_dev->nbalt;
 618
 619         if (gspca_dev->sd_desc->isoc_init) {
 620                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 621                 if (ret < 0)
 622                         goto out;
 623         }
 624         ep = get_ep(gspca_dev);
 625         if (ep == NULL) {
 626                 ret = -EIO;
 627                 goto out;
 628         }
 629         for (;;) {
 630                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 631                 ret = create_urbs(gspca_dev, ep);
 632                 if (ret < 0)
 633                         goto out;
 634
 635                 /* clear the bulk endpoint */
 636                 if (gspca_dev->cam.bulk)
 637                         usb_clear_halt(gspca_dev->dev,
 638                                         gspca_dev->urb[0]->pipe);
 639
 640                 /* start the cam */
 641                 ret = gspca_dev->sd_desc->start(gspca_dev);
 642                 if (ret < 0) {
 643                         destroy_urbs(gspca_dev);
 644                         goto out;
 645                 }
 646                 gspca_dev->streaming = 1;
 647
 648                 /* some bulk transfers are started by the subdriver */
 649                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 650                         break;
 651
 652                 /* submit the URBs */
 653                 for (n = 0; n < gspca_dev->nurbs; n++) {
 654                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 655                         if (ret < 0)
 656                                 break;
 657                 }
 658                 if (ret >= 0)
 659                         break;
 660                 PDEBUG(D_ERR|D_STREAM,
 661                         "usb_submit_urb alt %d err %d", gspca_dev->alt, ret);
 662                 gspca_dev->streaming = 0;
 663                 destroy_urbs(gspca_dev);
 664                 if (ret != -ENOSPC)
 665                         goto out;
 666
 667                 /* the bandwidth is not wide enough
 668                  * negociate or try a lower alternate setting */
 669                 msleep(20);     /* wait for kill complete */
 670                 if (gspca_dev->sd_desc->isoc_nego) {
 671                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 672                         if (ret < 0)
 673                                 goto out;
 674                 } else {
 675                         ep = get_ep(gspca_dev);
 676                         if (ep == NULL) {
 677                                 ret = -EIO;
 678                                 goto out;
 679                         }
 680                 }
 681         }
 682 out:
 683         mutex_unlock(&gspca_dev->usb_lock);
 684         return ret;
 685 }
 686
 687 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 688 {
 689         int ret;
 690
 691         if (gspca_dev->alt == 0)
 692                 return 0;
 693         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 694         if (ret < 0)
 695                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 696         return ret;
 697 }
 698
 699 /* Note: both the queue and the usb locks should be held when calling this */
 700 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 701 {
 702         gspca_dev->streaming = 0;
 703         if (gspca_dev->present) {
 704                 if (gspca_dev->sd_desc->stopN)
 705                         gspca_dev->sd_desc->stopN(gspca_dev);
 706                 destroy_urbs(gspca_dev);
 707                 gspca_set_alt0(gspca_dev);
 708         }
 709
 710         /* always call stop0 to free the subdriver's resources */
 711         if (gspca_dev->sd_desc->stop0)
 712                 gspca_dev->sd_desc->stop0(gspca_dev);
 713         PDEBUG(D_STREAM, "stream off OK");
 714 }
 715
 716 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 717 {
 718         int i;
 719
 720         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 721         gspca_dev->curr_mode = i;
 722         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 723         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 724         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 725 }
 726
 727 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 728                         int width, int height)
 729 {
 730         int i;
 731
 732         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 733                 if (width >= gspca_dev->cam.cam_mode[i].width
 734                     && height >= gspca_dev->cam.cam_mode[i].height)
 735                         break;
 736         }
 737         return i;
 738 }
 739
 740 /*
 741  * search a mode with the right pixel format
 742  */
 743 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 744                         int mode,
 745                         int pixfmt)
 746 {
 747         int modeU, modeD;
 748
 749         modeU = modeD = mode;
 750         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 751                 if (--modeD >= 0) {
 752                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 753                                                                 == pixfmt)
 754                                 return modeD;
 755                 }
 756                 if (++modeU < gspca_dev->cam.nmodes) {
 757                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 758                                                                 == pixfmt)
 759                                 return modeU;
 760                 }
 761         }
 762         return -EINVAL;
 763 }
 764
 765 #ifdef CONFIG_VIDEO_ADV_DEBUG
 766 static int vidioc_g_register(struct file *file, void *priv,
 767                         struct v4l2_dbg_register *reg)
 768 {
 769         int ret;
 770         struct gspca_dev *gspca_dev = priv;
 771
 772         if (!gspca_dev->sd_desc->get_chip_ident)
 773                 return -EINVAL;
 774
 775         if (!gspca_dev->sd_desc->get_register)
 776                 return -EINVAL;
 777
 778         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 779                 return -ERESTARTSYS;
 780         if (gspca_dev->present)
 781                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 782         else
 783                 ret = -ENODEV;
 784         mutex_unlock(&gspca_dev->usb_lock);
 785
 786         return ret;
 787 }
 788
 789 static int vidioc_s_register(struct file *file, void *priv,
 790                         struct v4l2_dbg_register *reg)
 791 {
 792         int ret;
 793         struct gspca_dev *gspca_dev = priv;
 794
 795         if (!gspca_dev->sd_desc->get_chip_ident)
 796                 return -EINVAL;
 797
 798         if (!gspca_dev->sd_desc->set_register)
 799                 return -EINVAL;
 800
 801         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 802                 return -ERESTARTSYS;
 803         if (gspca_dev->present)
 804                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 805         else
 806                 ret = -ENODEV;
 807         mutex_unlock(&gspca_dev->usb_lock);
 808
 809         return ret;
 810 }
 811 #endif
 812
 813 static int vidioc_g_chip_ident(struct file *file, void *priv,
 814                         struct v4l2_dbg_chip_ident *chip)
 815 {
 816         int ret;
 817         struct gspca_dev *gspca_dev = priv;
 818
 819         if (!gspca_dev->sd_desc->get_chip_ident)
 820                 return -EINVAL;
 821
 822         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 823                 return -ERESTARTSYS;
 824         if (gspca_dev->present)
 825                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 826         else
 827                 ret = -ENODEV;
 828         mutex_unlock(&gspca_dev->usb_lock);
 829
 830         return ret;
 831 }
 832
 833 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 834                                 struct v4l2_fmtdesc *fmtdesc)
 835 {
 836         struct gspca_dev *gspca_dev = priv;
 837         int i, j, index;
 838         __u32 fmt_tb[8];
 839
 840         /* give an index to each format */
 841         index = 0;
 842         j = 0;
 843         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 844                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 845                 j = 0;
 846                 for (;;) {
 847                         if (fmt_tb[j] == fmt_tb[index])
 848                                 break;
 849                         j++;
 850                 }
 851                 if (j == index) {
 852                         if (fmtdesc->index == index)
 853                                 break;          /* new format */
 854                         index++;
 855                         if (index >= ARRAY_SIZE(fmt_tb))
 856                                 return -EINVAL;
 857                 }
 858         }
 859         if (i < 0)
 860                 return -EINVAL;         /* no more format */
 861
 862         fmtdesc->pixelformat = fmt_tb[index];
 863         if (gspca_is_compressed(fmt_tb[index]))
 864                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 865         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 866         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 867         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 868         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 869         fmtdesc->description[4] = '\0';
 870         return 0;
 871 }
 872
 873 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 874                             struct v4l2_format *fmt)
 875 {
 876         struct gspca_dev *gspca_dev = priv;
 877         int mode;
 878
 879         mode = gspca_dev->curr_mode;
 880         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 881                 sizeof fmt->fmt.pix);
 882         return 0;
 883 }
 884
 885 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 886                         struct v4l2_format *fmt)
 887 {
 888         int w, h, mode, mode2;
 889
 890         w = fmt->fmt.pix.width;
 891         h = fmt->fmt.pix.height;
 892
 893 #ifdef GSPCA_DEBUG
 894         if (gspca_debug & D_CONF)
 895                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 896 #endif
 897         /* search the closest mode for width and height */
 898         mode = wxh_to_mode(gspca_dev, w, h);
 899
 900         /* OK if right palette */
 901         if (gspca_dev->cam.cam_mode[mode].pixelformat
 902                                                 != fmt->fmt.pix.pixelformat) {
 903
 904                 /* else, search the closest mode with the same pixel format */
 905                 mode2 = gspca_get_mode(gspca_dev, mode,
 906                                         fmt->fmt.pix.pixelformat);
 907                 if (mode2 >= 0)
 908                         mode = mode2;
 909 /*              else
 910                         ;                * no chance, return this mode */
 911         }
 912         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 913                 sizeof fmt->fmt.pix);
 914         return mode;                    /* used when s_fmt */
 915 }
 916
 917 static int vidioc_try_fmt_vid_cap(struct file *file,
 918                               void *priv,
 919                               struct v4l2_format *fmt)
 920 {
 921         struct gspca_dev *gspca_dev = priv;
 922         int ret;
 923
 924         ret = try_fmt_vid_cap(gspca_dev, fmt);
 925         if (ret < 0)
 926                 return ret;
 927         return 0;
 928 }
 929
 930 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 931                             struct v4l2_format *fmt)
 932 {
 933         struct gspca_dev *gspca_dev = priv;
 934         int ret;
 935
 936         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 937                 return -ERESTARTSYS;
 938
 939         ret = try_fmt_vid_cap(gspca_dev, fmt);
 940         if (ret < 0)
 941                 goto out;
 942
 943         if (gspca_dev->nframes != 0
 944             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 945                 ret = -EINVAL;
 946                 goto out;
 947         }
 948
 949         if (ret == gspca_dev->curr_mode) {
 950                 ret = 0;
 951                 goto out;                       /* same mode */
 952         }
 953
 954         if (gspca_dev->streaming) {
 955                 ret = -EBUSY;
 956                 goto out;
 957         }
 958         gspca_dev->width = fmt->fmt.pix.width;
 959         gspca_dev->height = fmt->fmt.pix.height;
 960         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 961         gspca_dev->curr_mode = ret;
 962
 963         ret = 0;
 964 out:
 965         mutex_unlock(&gspca_dev->queue_lock);
 966         return ret;
 967 }
 968
 969 static int vidioc_enum_framesizes(struct file *file, void *priv,
 970                                   struct v4l2_frmsizeenum *fsize)
 971 {
 972         struct gspca_dev *gspca_dev = priv;
 973         int i;
 974         __u32 index = 0;
 975
 976         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 977                 if (fsize->pixel_format !=
 978                                 gspca_dev->cam.cam_mode[i].pixelformat)
 979                         continue;
 980
 981                 if (fsize->index == index) {
 982                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 983                         fsize->discrete.width =
 984                                 gspca_dev->cam.cam_mode[i].width;
 985                         fsize->discrete.height =
 986                                 gspca_dev->cam.cam_mode[i].height;
 987                         return 0;
 988                 }
 989                 index++;
 990         }
 991
 992         return -EINVAL;
 993 }
 994
 995 static void gspca_release(struct video_device *vfd)
 996 {
 997         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 998
 999         PDEBUG(D_PROBE, "/dev/video%d released", gspca_dev->vdev.num);
1000
1001         kfree(gspca_dev->usb_buf);
1002         kfree(gspca_dev);
1003 }
1004
1005 static int dev_open(struct file *file)
1006 {
1007         struct gspca_dev *gspca_dev;
1008         int ret;
1009
1010         PDEBUG(D_STREAM, "[%s] open", current->comm);
1011         gspca_dev = (struct gspca_dev *) video_devdata(file);
1012         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1013                 return -ERESTARTSYS;
1014         if (!gspca_dev->present) {
1015                 ret = -ENODEV;
1016                 goto out;
1017         }
1018
1019         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1020                 ret = -EBUSY;
1021                 goto out;
1022         }
1023
1024         /* protect the subdriver against rmmod */
1025         if (!try_module_get(gspca_dev->module)) {
1026                 ret = -ENODEV;
1027                 goto out;
1028         }
1029
1030         gspca_dev->users++;
1031
1032         file->private_data = gspca_dev;
1033 #ifdef GSPCA_DEBUG
1034         /* activate the v4l2 debug */
1035         if (gspca_debug & D_V4L2)
1036                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1037                                         | V4L2_DEBUG_IOCTL_ARG;
1038         else
1039                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1040                                         | V4L2_DEBUG_IOCTL_ARG);
1041 #endif
1042         ret = 0;
1043 out:
1044         mutex_unlock(&gspca_dev->queue_lock);
1045         if (ret != 0)
1046                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1047         else
1048                 PDEBUG(D_STREAM, "open done");
1049         return ret;
1050 }
1051
1052 static int dev_close(struct file *file)
1053 {
1054         struct gspca_dev *gspca_dev = file->private_data;
1055
1056         PDEBUG(D_STREAM, "[%s] close", current->comm);
1057         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1058                 return -ERESTARTSYS;
1059         gspca_dev->users--;
1060
1061         /* if the file did the capture, free the streaming resources */
1062         if (gspca_dev->capt_file == file) {
1063                 if (gspca_dev->streaming) {
1064                         mutex_lock(&gspca_dev->usb_lock);
1065                         gspca_stream_off(gspca_dev);
1066                         mutex_unlock(&gspca_dev->usb_lock);
1067                 }
1068                 frame_free(gspca_dev);
1069                 gspca_dev->capt_file = NULL;
1070                 gspca_dev->memory = GSPCA_MEMORY_NO;
1071         }
1072         file->private_data = NULL;
1073         module_put(gspca_dev->module);
1074         mutex_unlock(&gspca_dev->queue_lock);
1075
1076         PDEBUG(D_STREAM, "close done");
1077
1078         return 0;
1079 }
1080
1081 static int vidioc_querycap(struct file *file, void  *priv,
1082                            struct v4l2_capability *cap)
1083 {
1084         struct gspca_dev *gspca_dev = priv;
1085         int ret;
1086
1087         /* protect the access to the usb device */
1088         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1089                 return -ERESTARTSYS;
1090         if (!gspca_dev->present) {
1091                 ret = -ENODEV;
1092                 goto out;
1093         }
1094         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1095         if (gspca_dev->dev->product != NULL) {
1096                 strncpy(cap->card, gspca_dev->dev->product,
1097                         sizeof cap->card);
1098         } else {
1099                 snprintf(cap->card, sizeof cap->card,
1100                         "USB Camera (%04x:%04x)",
1101                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1102                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1103         }
1104         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1105         cap->version = DRIVER_VERSION_NUMBER;
1106         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1107                           | V4L2_CAP_STREAMING
1108                           | V4L2_CAP_READWRITE;
1109         ret = 0;
1110 out:
1111         mutex_unlock(&gspca_dev->usb_lock);
1112         return ret;
1113 }
1114
1115 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1116                                    int id)
1117 {
1118         const struct ctrl *ctrls;
1119         int i;
1120
1121         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1122              i < gspca_dev->sd_desc->nctrls;
1123              i++, ctrls++) {
1124                 if (gspca_dev->ctrl_dis & (1 << i))
1125                         continue;
1126                 if (id == ctrls->qctrl.id)
1127                         return ctrls;
1128         }
1129         return NULL;
1130 }
1131
1132 static int vidioc_queryctrl(struct file *file, void *priv,
1133                            struct v4l2_queryctrl *q_ctrl)
1134 {
1135         struct gspca_dev *gspca_dev = priv;
1136         const struct ctrl *ctrls;
1137         int i;
1138         u32 id;
1139
1140         ctrls = NULL;
1141         id = q_ctrl->id;
1142         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1143                 id &= V4L2_CTRL_ID_MASK;
1144                 id++;
1145                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1146                         if (gspca_dev->ctrl_dis & (1 << i))
1147                                 continue;
1148                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1149                                 continue;
1150                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1151                                             > ctrls->qctrl.id)
1152                                 continue;
1153                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1154                 }
1155         } else {
1156                 ctrls = get_ctrl(gspca_dev, id);
1157         }
1158         if (ctrls == NULL)
1159                 return -EINVAL;
1160         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1161         return 0;
1162 }
1163
1164 static int vidioc_s_ctrl(struct file *file, void *priv,
1165                          struct v4l2_control *ctrl)
1166 {
1167         struct gspca_dev *gspca_dev = priv;
1168         const struct ctrl *ctrls;
1169         int ret;
1170
1171         ctrls = get_ctrl(gspca_dev, ctrl->id);
1172         if (ctrls == NULL)
1173                 return -EINVAL;
1174
1175         if (ctrl->value < ctrls->qctrl.minimum
1176             || ctrl->value > ctrls->qctrl.maximum)
1177                 return -ERANGE;
1178         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1179         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1180                 return -ERESTARTSYS;
1181         if (gspca_dev->present)
1182                 ret = ctrls->set(gspca_dev, ctrl->value);
1183         else
1184                 ret = -ENODEV;
1185         mutex_unlock(&gspca_dev->usb_lock);
1186         return ret;
1187 }
1188
1189 static int vidioc_g_ctrl(struct file *file, void *priv,
1190                          struct v4l2_control *ctrl)
1191 {
1192         struct gspca_dev *gspca_dev = priv;
1193         const struct ctrl *ctrls;
1194         int ret;
1195
1196         ctrls = get_ctrl(gspca_dev, ctrl->id);
1197         if (ctrls == NULL)
1198                 return -EINVAL;
1199
1200         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1201                 return -ERESTARTSYS;
1202         if (gspca_dev->present)
1203                 ret = ctrls->get(gspca_dev, &ctrl->value);
1204         else
1205                 ret = -ENODEV;
1206         mutex_unlock(&gspca_dev->usb_lock);
1207         return ret;
1208 }
1209
1210 /*fixme: have an audio flag in gspca_dev?*/
1211 static int vidioc_s_audio(struct file *file, void *priv,
1212                          struct v4l2_audio *audio)
1213 {
1214         if (audio->index != 0)
1215                 return -EINVAL;
1216         return 0;
1217 }
1218
1219 static int vidioc_g_audio(struct file *file, void *priv,
1220                          struct v4l2_audio *audio)
1221 {
1222         strcpy(audio->name, "Microphone");
1223         return 0;
1224 }
1225
1226 static int vidioc_enumaudio(struct file *file, void *priv,
1227                          struct v4l2_audio *audio)
1228 {
1229         if (audio->index != 0)
1230                 return -EINVAL;
1231
1232         strcpy(audio->name, "Microphone");
1233         audio->capability = 0;
1234         audio->mode = 0;
1235         return 0;
1236 }
1237
1238 static int vidioc_querymenu(struct file *file, void *priv,
1239                             struct v4l2_querymenu *qmenu)
1240 {
1241         struct gspca_dev *gspca_dev = priv;
1242
1243         if (!gspca_dev->sd_desc->querymenu)
1244                 return -EINVAL;
1245         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1246 }
1247
1248 static int vidioc_enum_input(struct file *file, void *priv,
1249                                 struct v4l2_input *input)
1250 {
1251         struct gspca_dev *gspca_dev = priv;
1252
1253         if (input->index != 0)
1254                 return -EINVAL;
1255         input->type = V4L2_INPUT_TYPE_CAMERA;
1256         input->status = gspca_dev->cam.input_flags;
1257         strncpy(input->name, gspca_dev->sd_desc->name,
1258                 sizeof input->name);
1259         return 0;
1260 }
1261
1262 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1263 {
1264         *i = 0;
1265         return 0;
1266 }
1267
1268 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1269 {
1270         if (i > 0)
1271                 return -EINVAL;
1272         return (0);
1273 }
1274
1275 static int vidioc_reqbufs(struct file *file, void *priv,
1276                           struct v4l2_requestbuffers *rb)
1277 {
1278         struct gspca_dev *gspca_dev = priv;
1279         int i, ret = 0;
1280
1281         switch (rb->memory) {
1282         case GSPCA_MEMORY_READ:                 /* (internal call) */
1283         case V4L2_MEMORY_MMAP:
1284         case V4L2_MEMORY_USERPTR:
1285                 break;
1286         default:
1287                 return -EINVAL;
1288         }
1289         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1290                 return -ERESTARTSYS;
1291
1292         if (gspca_dev->memory != GSPCA_MEMORY_NO
1293             && gspca_dev->memory != rb->memory) {
1294                 ret = -EBUSY;
1295                 goto out;
1296         }
1297
1298         /* only one file may do the capture */
1299         if (gspca_dev->capt_file != NULL
1300             && gspca_dev->capt_file != file) {
1301                 ret = -EBUSY;
1302                 goto out;
1303         }
1304
1305         /* if allocated, the buffers must not be mapped */
1306         for (i = 0; i < gspca_dev->nframes; i++) {
1307                 if (gspca_dev->frame[i].vma_use_count) {
1308                         ret = -EBUSY;
1309                         goto out;
1310                 }
1311         }
1312
1313         /* stop streaming */
1314         if (gspca_dev->streaming) {
1315                 mutex_lock(&gspca_dev->usb_lock);
1316                 gspca_stream_off(gspca_dev);
1317                 mutex_unlock(&gspca_dev->usb_lock);
1318         }
1319
1320         /* free the previous allocated buffers, if any */
1321         if (gspca_dev->nframes != 0) {
1322                 frame_free(gspca_dev);
1323                 gspca_dev->capt_file = NULL;
1324         }
1325         if (rb->count == 0)                     /* unrequest */
1326                 goto out;
1327         gspca_dev->memory = rb->memory;
1328         ret = frame_alloc(gspca_dev, rb->count);
1329         if (ret == 0) {
1330                 rb->count = gspca_dev->nframes;
1331                 gspca_dev->capt_file = file;
1332         }
1333 out:
1334         mutex_unlock(&gspca_dev->queue_lock);
1335         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1336         return ret;
1337 }
1338
1339 static int vidioc_querybuf(struct file *file, void *priv,
1340                            struct v4l2_buffer *v4l2_buf)
1341 {
1342         struct gspca_dev *gspca_dev = priv;
1343         struct gspca_frame *frame;
1344
1345         if (v4l2_buf->index < 0
1346             || v4l2_buf->index >= gspca_dev->nframes)
1347                 return -EINVAL;
1348
1349         frame = &gspca_dev->frame[v4l2_buf->index];
1350         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1351         return 0;
1352 }
1353
1354 static int vidioc_streamon(struct file *file, void *priv,
1355                            enum v4l2_buf_type buf_type)
1356 {
1357         struct gspca_dev *gspca_dev = priv;
1358         int ret;
1359
1360         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1361                 return -EINVAL;
1362         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1363                 return -ERESTARTSYS;
1364
1365         if (gspca_dev->nframes == 0
1366             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1367                 ret = -EINVAL;
1368                 goto out;
1369         }
1370         if (!gspca_dev->streaming) {
1371                 ret = gspca_init_transfer(gspca_dev);
1372                 if (ret < 0)
1373                         goto out;
1374         }
1375 #ifdef GSPCA_DEBUG
1376         if (gspca_debug & D_STREAM) {
1377                 PDEBUG_MODE("stream on OK",
1378                         gspca_dev->pixfmt,
1379                         gspca_dev->width,
1380                         gspca_dev->height);
1381         }
1382 #endif
1383         ret = 0;
1384 out:
1385         mutex_unlock(&gspca_dev->queue_lock);
1386         return ret;
1387 }
1388
1389 static int vidioc_streamoff(struct file *file, void *priv,
1390                                 enum v4l2_buf_type buf_type)
1391 {
1392         struct gspca_dev *gspca_dev = priv;
1393         int i, ret;
1394
1395         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1396                 return -EINVAL;
1397         if (!gspca_dev->streaming)
1398                 return 0;
1399         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1400                 return -ERESTARTSYS;
1401
1402         /* stop streaming */
1403         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1404                 ret = -ERESTARTSYS;
1405                 goto out;
1406         }
1407         gspca_stream_off(gspca_dev);
1408         mutex_unlock(&gspca_dev->usb_lock);
1409
1410         /* empty the application queues */
1411         for (i = 0; i < gspca_dev->nframes; i++)
1412                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1413         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1414         gspca_dev->last_packet_type = DISCARD_PACKET;
1415         gspca_dev->sequence = 0;
1416         ret = 0;
1417 out:
1418         mutex_unlock(&gspca_dev->queue_lock);
1419         return ret;
1420 }
1421
1422 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1423                         struct v4l2_jpegcompression *jpegcomp)
1424 {
1425         struct gspca_dev *gspca_dev = priv;
1426         int ret;
1427
1428         if (!gspca_dev->sd_desc->get_jcomp)
1429                 return -EINVAL;
1430         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1431                 return -ERESTARTSYS;
1432         if (gspca_dev->present)
1433                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1434         else
1435                 ret = -ENODEV;
1436         mutex_unlock(&gspca_dev->usb_lock);
1437         return ret;
1438 }
1439
1440 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1441                         struct v4l2_jpegcompression *jpegcomp)
1442 {
1443         struct gspca_dev *gspca_dev = priv;
1444         int ret;
1445
1446         if (!gspca_dev->sd_desc->set_jcomp)
1447                 return -EINVAL;
1448         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1449                 return -ERESTARTSYS;
1450         if (gspca_dev->present)
1451                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1452         else
1453                 ret = -ENODEV;
1454         mutex_unlock(&gspca_dev->usb_lock);
1455         return ret;
1456 }
1457
1458 static int vidioc_g_parm(struct file *filp, void *priv,
1459                         struct v4l2_streamparm *parm)
1460 {
1461         struct gspca_dev *gspca_dev = priv;
1462
1463         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1464
1465         if (gspca_dev->sd_desc->get_streamparm) {
1466                 int ret;
1467
1468                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1469                         return -ERESTARTSYS;
1470                 if (gspca_dev->present)
1471                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1472                                                                  parm);
1473                 else
1474                         ret = -ENODEV;
1475                 mutex_unlock(&gspca_dev->usb_lock);
1476                 return ret;
1477         }
1478
1479         return 0;
1480 }
1481
1482 static int vidioc_s_parm(struct file *filp, void *priv,
1483                         struct v4l2_streamparm *parm)
1484 {
1485         struct gspca_dev *gspca_dev = priv;
1486         int n;
1487
1488         n = parm->parm.capture.readbuffers;
1489         if (n == 0 || n > GSPCA_MAX_FRAMES)
1490                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1491         else
1492                 gspca_dev->nbufread = n;
1493
1494         if (gspca_dev->sd_desc->set_streamparm) {
1495                 int ret;
1496
1497                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1498                         return -ERESTARTSYS;
1499                 if (gspca_dev->present)
1500                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1501                                                                  parm);
1502                 else
1503                         ret = -ENODEV;
1504                 mutex_unlock(&gspca_dev->usb_lock);
1505                 return ret;
1506         }
1507
1508         return 0;
1509 }
1510
1511 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1512 static int vidiocgmbuf(struct file *file, void *priv,
1513                         struct video_mbuf *mbuf)
1514 {
1515         struct gspca_dev *gspca_dev = file->private_data;
1516         int i;
1517
1518         PDEBUG(D_STREAM, "cgmbuf");
1519         if (gspca_dev->nframes == 0) {
1520                 int ret;
1521
1522                 {
1523                         struct v4l2_format fmt;
1524
1525                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1526                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1527                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1528                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1529                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1530                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1531                         if (ret != 0)
1532                                 return ret;
1533                 }
1534                 {
1535                         struct v4l2_requestbuffers rb;
1536
1537                         memset(&rb, 0, sizeof rb);
1538                         rb.count = 4;
1539                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1540                         rb.memory = V4L2_MEMORY_MMAP;
1541                         ret = vidioc_reqbufs(file, priv, &rb);
1542                         if (ret != 0)
1543                                 return ret;
1544                 }
1545         }
1546         mbuf->frames = gspca_dev->nframes;
1547         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1548         for (i = 0; i < mbuf->frames; i++)
1549                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1550         return 0;
1551 }
1552 #endif
1553
1554 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1555 {
1556         struct gspca_dev *gspca_dev = file->private_data;
1557         struct gspca_frame *frame;
1558         struct page *page;
1559         unsigned long addr, start, size;
1560         int i, ret;
1561
1562         start = vma->vm_start;
1563         size = vma->vm_end - vma->vm_start;
1564         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1565
1566         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1567                 return -ERESTARTSYS;
1568         if (!gspca_dev->present) {
1569                 ret = -ENODEV;
1570                 goto out;
1571         }
1572         if (gspca_dev->capt_file != file) {
1573                 ret = -EINVAL;
1574                 goto out;
1575         }
1576
1577         frame = NULL;
1578         for (i = 0; i < gspca_dev->nframes; ++i) {
1579                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1580                         PDEBUG(D_STREAM, "mmap bad memory type");
1581                         break;
1582                 }
1583                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1584                                                 == vma->vm_pgoff) {
1585                         frame = &gspca_dev->frame[i];
1586                         break;
1587                 }
1588         }
1589         if (frame == NULL) {
1590                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1591                 ret = -EINVAL;
1592                 goto out;
1593         }
1594 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1595         /* v4l1 maps all the buffers */
1596         if (i != 0
1597             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1598 #endif
1599             if (size != frame->v4l2_buf.length) {
1600                 PDEBUG(D_STREAM, "mmap bad size");
1601                 ret = -EINVAL;
1602                 goto out;
1603         }
1604
1605         /*
1606          * - VM_IO marks the area as being a mmaped region for I/O to a
1607          *   device. It also prevents the region from being core dumped.
1608          */
1609         vma->vm_flags |= VM_IO;
1610
1611         addr = (unsigned long) frame->data;
1612         while (size > 0) {
1613                 page = vmalloc_to_page((void *) addr);
1614                 ret = vm_insert_page(vma, start, page);
1615                 if (ret < 0)
1616                         goto out;
1617                 start += PAGE_SIZE;
1618                 addr += PAGE_SIZE;
1619                 size -= PAGE_SIZE;
1620         }
1621
1622         vma->vm_ops = &gspca_vm_ops;
1623         vma->vm_private_data = frame;
1624         gspca_vm_open(vma);
1625         ret = 0;
1626 out:
1627         mutex_unlock(&gspca_dev->queue_lock);
1628         return ret;
1629 }
1630
1631 /*
1632  * wait for a video frame
1633  *
1634  * If a frame is ready, its index is returned.
1635  */
1636 static int frame_wait(struct gspca_dev *gspca_dev,
1637                         int nonblock_ing)
1638 {
1639         struct gspca_frame *frame;
1640         int i, j, ret;
1641
1642         /* check if a frame is ready */
1643         i = gspca_dev->fr_o;
1644         j = gspca_dev->fr_queue[i];
1645         frame = &gspca_dev->frame[j];
1646
1647         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1648                 if (nonblock_ing)
1649                         return -EAGAIN;
1650
1651                 /* wait till a frame is ready */
1652                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1653                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1654                         !gspca_dev->streaming || !gspca_dev->present,
1655                         msecs_to_jiffies(3000));
1656                 if (ret < 0)
1657                         return ret;
1658                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1659                         return -EIO;
1660         }
1661
1662         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1663         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1664                 gspca_dev->fr_q,
1665                 gspca_dev->fr_i,
1666                 gspca_dev->fr_o);
1667
1668         if (gspca_dev->sd_desc->dq_callback) {
1669                 mutex_lock(&gspca_dev->usb_lock);
1670                 if (gspca_dev->present)
1671                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1672                 mutex_unlock(&gspca_dev->usb_lock);
1673         }
1674         return j;
1675 }
1676
1677 /*
1678  * dequeue a video buffer
1679  *
1680  * If nonblock_ing is false, block until a buffer is available.
1681  */
1682 static int vidioc_dqbuf(struct file *file, void *priv,
1683                         struct v4l2_buffer *v4l2_buf)
1684 {
1685         struct gspca_dev *gspca_dev = priv;
1686         struct gspca_frame *frame;
1687         int i, ret;
1688
1689         PDEBUG(D_FRAM, "dqbuf");
1690         if (v4l2_buf->memory != gspca_dev->memory)
1691                 return -EINVAL;
1692
1693         if (!gspca_dev->present)
1694                 return -ENODEV;
1695
1696         /* if not streaming, be sure the application will not loop forever */
1697         if (!(file->f_flags & O_NONBLOCK)
1698             && !gspca_dev->streaming && gspca_dev->users == 1)
1699                 return -EINVAL;
1700
1701         /* only the capturing file may dequeue */
1702         if (gspca_dev->capt_file != file)
1703                 return -EINVAL;
1704
1705         /* only one dequeue / read at a time */
1706         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1707                 return -ERESTARTSYS;
1708
1709         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1710         if (ret < 0)
1711                 goto out;
1712         i = ret;                                /* frame index */
1713         frame = &gspca_dev->frame[i];
1714         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1715                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1716                                  frame->data,
1717                                  frame->v4l2_buf.bytesused)) {
1718                         PDEBUG(D_ERR|D_STREAM,
1719                                 "dqbuf cp to user failed");
1720                         ret = -EFAULT;
1721                         goto out;
1722                 }
1723         }
1724         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1725         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1726         PDEBUG(D_FRAM, "dqbuf %d", i);
1727         ret = 0;
1728 out:
1729         mutex_unlock(&gspca_dev->read_lock);
1730         return ret;
1731 }
1732
1733 /*
1734  * queue a video buffer
1735  *
1736  * Attempting to queue a buffer that has already been
1737  * queued will return -EINVAL.
1738  */
1739 static int vidioc_qbuf(struct file *file, void *priv,
1740                         struct v4l2_buffer *v4l2_buf)
1741 {
1742         struct gspca_dev *gspca_dev = priv;
1743         struct gspca_frame *frame;
1744         int i, index, ret;
1745
1746         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1747
1748         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1749                 return -ERESTARTSYS;
1750
1751         index = v4l2_buf->index;
1752         if ((unsigned) index >= gspca_dev->nframes) {
1753                 PDEBUG(D_FRAM,
1754                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1755                 ret = -EINVAL;
1756                 goto out;
1757         }
1758         if (v4l2_buf->memory != gspca_dev->memory) {
1759                 PDEBUG(D_FRAM, "qbuf bad memory type");
1760                 ret = -EINVAL;
1761                 goto out;
1762         }
1763
1764         frame = &gspca_dev->frame[index];
1765         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1766                 PDEBUG(D_FRAM, "qbuf bad state");
1767                 ret = -EINVAL;
1768                 goto out;
1769         }
1770
1771         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1772
1773         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1774                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1775                 frame->v4l2_buf.length = v4l2_buf->length;
1776         }
1777
1778         /* put the buffer in the 'queued' queue */
1779         i = gspca_dev->fr_q;
1780         gspca_dev->fr_queue[i] = index;
1781         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1782         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1783                 gspca_dev->fr_q,
1784                 gspca_dev->fr_i,
1785                 gspca_dev->fr_o);
1786
1787         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1788         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1789         ret = 0;
1790 out:
1791         mutex_unlock(&gspca_dev->queue_lock);
1792         return ret;
1793 }
1794
1795 /*
1796  * allocate the resources for read()
1797  */
1798 static int read_alloc(struct gspca_dev *gspca_dev,
1799                         struct file *file)
1800 {
1801         struct v4l2_buffer v4l2_buf;
1802         int i, ret;
1803
1804         PDEBUG(D_STREAM, "read alloc");
1805         if (gspca_dev->nframes == 0) {
1806                 struct v4l2_requestbuffers rb;
1807
1808                 memset(&rb, 0, sizeof rb);
1809                 rb.count = gspca_dev->nbufread;
1810                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1811                 rb.memory = GSPCA_MEMORY_READ;
1812                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1813                 if (ret != 0) {
1814                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1815                         return ret;
1816                 }
1817                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1818                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1819                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1820                 for (i = 0; i < gspca_dev->nbufread; i++) {
1821                         v4l2_buf.index = i;
1822                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1823                         if (ret != 0) {
1824                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1825                                 return ret;
1826                         }
1827                 }
1828                 gspca_dev->memory = GSPCA_MEMORY_READ;
1829         }
1830
1831         /* start streaming */
1832         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1833         if (ret != 0)
1834                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1835         return ret;
1836 }
1837
1838 static unsigned int dev_poll(struct file *file, poll_table *wait)
1839 {
1840         struct gspca_dev *gspca_dev = file->private_data;
1841         int i, ret;
1842
1843         PDEBUG(D_FRAM, "poll");
1844
1845         poll_wait(file, &gspca_dev->wq, wait);
1846
1847         /* if reqbufs is not done, the user would use read() */
1848         if (gspca_dev->nframes == 0) {
1849                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1850                         return POLLERR;         /* not the 1st time */
1851                 ret = read_alloc(gspca_dev, file);
1852                 if (ret != 0)
1853                         return POLLERR;
1854         }
1855
1856         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1857                 return POLLERR;
1858
1859         /* check the next incoming buffer */
1860         i = gspca_dev->fr_o;
1861         i = gspca_dev->fr_queue[i];
1862         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1863                 ret = POLLIN | POLLRDNORM;      /* something to read */
1864         else
1865                 ret = 0;
1866         mutex_unlock(&gspca_dev->queue_lock);
1867         if (!gspca_dev->present)
1868                 return POLLHUP;
1869         return ret;
1870 }
1871
1872 static ssize_t dev_read(struct file *file, char __user *data,
1873                     size_t count, loff_t *ppos)
1874 {
1875         struct gspca_dev *gspca_dev = file->private_data;
1876         struct gspca_frame *frame;
1877         struct v4l2_buffer v4l2_buf;
1878         struct timeval timestamp;
1879         int n, ret, ret2;
1880
1881         PDEBUG(D_FRAM, "read (%zd)", count);
1882         if (!gspca_dev->present)
1883                 return -ENODEV;
1884         switch (gspca_dev->memory) {
1885         case GSPCA_MEMORY_NO:                   /* first time */
1886                 ret = read_alloc(gspca_dev, file);
1887                 if (ret != 0)
1888                         return ret;
1889                 break;
1890         case GSPCA_MEMORY_READ:
1891                 if (gspca_dev->capt_file == file)
1892                         break;
1893                 /* fall thru */
1894         default:
1895                 return -EINVAL;
1896         }
1897
1898         /* get a frame */
1899         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1900         timestamp.tv_sec--;
1901         n = 2;
1902         for (;;) {
1903                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1904                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1905                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1906                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1907                 if (ret != 0) {
1908                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1909                         return ret;
1910                 }
1911
1912                 /* if the process slept for more than 1 second,
1913                  * get a newer frame */
1914                 frame = &gspca_dev->frame[v4l2_buf.index];
1915                 if (--n < 0)
1916                         break;                  /* avoid infinite loop */
1917                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1918                         break;
1919                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1920                 if (ret != 0) {
1921                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1922                         return ret;
1923                 }
1924         }
1925
1926         /* copy the frame */
1927         if (count > frame->v4l2_buf.bytesused)
1928                 count = frame->v4l2_buf.bytesused;
1929         ret = copy_to_user(data, frame->data, count);
1930         if (ret != 0) {
1931                 PDEBUG(D_ERR|D_STREAM,
1932                         "read cp to user lack %d / %zd", ret, count);
1933                 ret = -EFAULT;
1934                 goto out;
1935         }
1936         ret = count;
1937 out:
1938         /* in each case, requeue the buffer */
1939         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1940         if (ret2 != 0)
1941                 return ret2;
1942         return ret;
1943 }
1944
1945 static struct v4l2_file_operations dev_fops = {
1946         .owner = THIS_MODULE,
1947         .open = dev_open,
1948         .release = dev_close,
1949         .read = dev_read,
1950         .mmap = dev_mmap,
1951         .unlocked_ioctl = video_ioctl2,
1952         .poll   = dev_poll,
1953 };
1954
1955 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1956         .vidioc_querycap        = vidioc_querycap,
1957         .vidioc_dqbuf           = vidioc_dqbuf,
1958         .vidioc_qbuf            = vidioc_qbuf,
1959         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1960         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1961         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1962         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1963         .vidioc_streamon        = vidioc_streamon,
1964         .vidioc_queryctrl       = vidioc_queryctrl,
1965         .vidioc_g_ctrl          = vidioc_g_ctrl,
1966         .vidioc_s_ctrl          = vidioc_s_ctrl,
1967         .vidioc_g_audio         = vidioc_g_audio,
1968         .vidioc_s_audio         = vidioc_s_audio,
1969         .vidioc_enumaudio       = vidioc_enumaudio,
1970         .vidioc_querymenu       = vidioc_querymenu,
1971         .vidioc_enum_input      = vidioc_enum_input,
1972         .vidioc_g_input         = vidioc_g_input,
1973         .vidioc_s_input         = vidioc_s_input,
1974         .vidioc_reqbufs         = vidioc_reqbufs,
1975         .vidioc_querybuf        = vidioc_querybuf,
1976         .vidioc_streamoff       = vidioc_streamoff,
1977         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1978         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1979         .vidioc_g_parm          = vidioc_g_parm,
1980         .vidioc_s_parm          = vidioc_s_parm,
1981         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1982 #ifdef CONFIG_VIDEO_ADV_DEBUG
1983         .vidioc_g_register      = vidioc_g_register,
1984         .vidioc_s_register      = vidioc_s_register,
1985 #endif
1986         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1987 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1988         .vidiocgmbuf          = vidiocgmbuf,
1989 #endif
1990 };
1991
1992 static struct video_device gspca_template = {
1993         .name = "gspca main driver",
1994         .fops = &dev_fops,
1995         .ioctl_ops = &dev_ioctl_ops,
1996         .release = gspca_release,
1997         .minor = -1,
1998 };
1999
2000 /*
2001  * probe and create a new gspca device
2002  *
2003  * This function must be called by the sub-driver when it is
2004  * called for probing a new device.
2005  */
2006 int gspca_dev_probe(struct usb_interface *intf,
2007                 const struct usb_device_id *id,
2008                 const struct sd_desc *sd_desc,
2009                 int dev_size,
2010                 struct module *module)
2011 {
2012         struct usb_interface_descriptor *interface;
2013         struct gspca_dev *gspca_dev;
2014         struct usb_device *dev = interface_to_usbdev(intf);
2015         int ret;
2016
2017         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2018
2019         /* we don't handle multi-config cameras */
2020         if (dev->descriptor.bNumConfigurations != 1) {
2021                 PDEBUG(D_ERR, "Too many config");
2022                 return -ENODEV;
2023         }
2024         interface = &intf->cur_altsetting->desc;
2025         if (interface->bInterfaceNumber > 0) {
2026                 PDEBUG(D_ERR, "intf != 0");
2027                 return -ENODEV;
2028         }
2029
2030         /* create the device */
2031         if (dev_size < sizeof *gspca_dev)
2032                 dev_size = sizeof *gspca_dev;
2033         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2034         if (!gspca_dev) {
2035                 err("couldn't kzalloc gspca struct");
2036                 return -ENOMEM;
2037         }
2038         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2039         if (!gspca_dev->usb_buf) {
2040                 err("out of memory");
2041                 ret = -ENOMEM;
2042                 goto out;
2043         }
2044         gspca_dev->dev = dev;
2045         gspca_dev->iface = interface->bInterfaceNumber;
2046         gspca_dev->nbalt = intf->num_altsetting;
2047         gspca_dev->sd_desc = sd_desc;
2048         gspca_dev->nbufread = 2;
2049         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2050
2051         /* configure the subdriver and initialize the USB device */
2052         ret = sd_desc->config(gspca_dev, id);
2053         if (ret < 0)
2054                 goto out;
2055         ret = sd_desc->init(gspca_dev);
2056         if (ret < 0)
2057                 goto out;
2058         ret = gspca_set_alt0(gspca_dev);
2059         if (ret < 0)
2060                 goto out;
2061         gspca_set_default_mode(gspca_dev);
2062
2063         mutex_init(&gspca_dev->usb_lock);
2064         mutex_init(&gspca_dev->read_lock);
2065         mutex_init(&gspca_dev->queue_lock);
2066         init_waitqueue_head(&gspca_dev->wq);
2067
2068         /* init video stuff */
2069         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2070         gspca_dev->vdev.parent = &intf->dev;
2071         gspca_dev->module = module;
2072         gspca_dev->present = 1;
2073         ret = video_register_device(&gspca_dev->vdev,
2074                                   VFL_TYPE_GRABBER,
2075                                   -1);
2076         if (ret < 0) {
2077                 err("video_register_device err %d", ret);
2078                 goto out;
2079         }
2080
2081         usb_set_intfdata(intf, gspca_dev);
2082         PDEBUG(D_PROBE, "/dev/video%d created", gspca_dev->vdev.num);
2083         return 0;
2084 out:
2085         kfree(gspca_dev->usb_buf);
2086         kfree(gspca_dev);
2087         return ret;
2088 }
2089 EXPORT_SYMBOL(gspca_dev_probe);
2090
2091 /*
2092  * USB disconnection
2093  *
2094  * This function must be called by the sub-driver
2095  * when the device disconnects, after the specific resources are freed.
2096  */
2097 void gspca_disconnect(struct usb_interface *intf)
2098 {
2099         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2100
2101         PDEBUG(D_PROBE, "/dev/video%d disconnect", gspca_dev->vdev.num);
2102         mutex_lock(&gspca_dev->usb_lock);
2103         gspca_dev->present = 0;
2104
2105         if (gspca_dev->streaming) {
2106                 destroy_urbs(gspca_dev);
2107                 wake_up_interruptible(&gspca_dev->wq);
2108         }
2109
2110         /* the device is freed at exit of this function */
2111         gspca_dev->dev = NULL;
2112         mutex_unlock(&gspca_dev->usb_lock);
2113
2114         usb_set_intfdata(intf, NULL);
2115
2116         /* release the device */
2117         /* (this will call gspca_release() immediatly or on last close) */
2118         video_unregister_device(&gspca_dev->vdev);
2119
2120 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2121 }
2122 EXPORT_SYMBOL(gspca_disconnect);
2123
2124 #ifdef CONFIG_PM
2125 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2126 {
2127         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2128
2129         if (!gspca_dev->streaming)
2130                 return 0;
2131         gspca_dev->frozen = 1;          /* avoid urb error messages */
2132         if (gspca_dev->sd_desc->stopN)
2133                 gspca_dev->sd_desc->stopN(gspca_dev);
2134         destroy_urbs(gspca_dev);
2135         gspca_set_alt0(gspca_dev);
2136         if (gspca_dev->sd_desc->stop0)
2137                 gspca_dev->sd_desc->stop0(gspca_dev);
2138         return 0;
2139 }
2140 EXPORT_SYMBOL(gspca_suspend);
2141
2142 int gspca_resume(struct usb_interface *intf)
2143 {
2144         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2145
2146         gspca_dev->frozen = 0;
2147         gspca_dev->sd_desc->init(gspca_dev);
2148         if (gspca_dev->streaming)
2149                 return gspca_init_transfer(gspca_dev);
2150         return 0;
2151 }
2152 EXPORT_SYMBOL(gspca_resume);
2153 #endif
2154 /* -- cam driver utility functions -- */
2155
2156 /* auto gain and exposure algorithm based on the knee algorithm described here:
2157    http://ytse.tricolour.net/docs/LowLightOptimization.html
2158
2159    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2160    where changed. */
2161 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2162         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2163 {
2164         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2165         const struct ctrl *gain_ctrl = NULL;
2166         const struct ctrl *exposure_ctrl = NULL;
2167         const struct ctrl *autogain_ctrl = NULL;
2168         int retval = 0;
2169
2170         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2171                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2172                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2173                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2174                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2175                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2176                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2177         }
2178         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2179                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2180                         "on cam without (auto)gain/exposure");
2181                 return 0;
2182         }
2183
2184         if (gain_ctrl->get(gspca_dev, &gain) ||
2185                         exposure_ctrl->get(gspca_dev, &exposure) ||
2186                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2187                 return 0;
2188
2189         orig_gain = gain;
2190         orig_exposure = exposure;
2191
2192         /* If we are of a multiple of deadzone, do multiple steps to reach the
2193            desired lumination fast (with the risc of a slight overshoot) */
2194         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2195
2196         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2197                 avg_lum, desired_avg_lum, steps);
2198
2199         for (i = 0; i < steps; i++) {
2200                 if (avg_lum > desired_avg_lum) {
2201                         if (gain > gain_knee)
2202                                 gain--;
2203                         else if (exposure > exposure_knee)
2204                                 exposure--;
2205                         else if (gain > gain_ctrl->qctrl.default_value)
2206                                 gain--;
2207                         else if (exposure > exposure_ctrl->qctrl.minimum)
2208                                 exposure--;
2209                         else if (gain > gain_ctrl->qctrl.minimum)
2210                                 gain--;
2211                         else
2212                                 break;
2213                 } else {
2214                         if (gain < gain_ctrl->qctrl.default_value)
2215                                 gain++;
2216                         else if (exposure < exposure_knee)
2217                                 exposure++;
2218                         else if (gain < gain_knee)
2219                                 gain++;
2220                         else if (exposure < exposure_ctrl->qctrl.maximum)
2221                                 exposure++;
2222                         else if (gain < gain_ctrl->qctrl.maximum)
2223                                 gain++;
2224                         else
2225                                 break;
2226                 }
2227         }
2228
2229         if (gain != orig_gain) {
2230                 gain_ctrl->set(gspca_dev, gain);
2231                 retval = 1;
2232         }
2233         if (exposure != orig_exposure) {
2234                 exposure_ctrl->set(gspca_dev, exposure);
2235                 retval = 1;
2236         }
2237
2238         return retval;
2239 }
2240 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2241
2242 /* -- module insert / remove -- */
2243 static int __init gspca_init(void)
2244 {
2245         info("main v%d.%d.%d registered",
2246                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2247                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2248                 DRIVER_VERSION_NUMBER & 0xff);
2249         return 0;
2250 }
2251 static void __exit gspca_exit(void)
2252 {
2253         info("main deregistered");
2254 }
2255
2256 module_init(gspca_init);
2257 module_exit(gspca_exit);
2258
2259 #ifdef GSPCA_DEBUG
2260 module_param_named(debug, gspca_debug, int, 0644);
2261 MODULE_PARM_DESC(debug,
2262                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2263                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2264                 " 0x0100: v4l2");
2265 #endif