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  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/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, 5, 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 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 #ifdef CONFIG_PM
 136                 if (!gspca_dev->frozen)
 137 #endif
 138                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 139                 return;         /* disconnection ? */
 140         }
 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 */
 145                 frame = gspca_get_i_frame(gspca_dev);
 146                 if (!frame) {
 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;
 153                 if (len == 0) {
 154                         if (gspca_dev->empty_packet == 0)
 155                                 gspca_dev->empty_packet = 1;
 156                         continue;
 157                 }
 158                 st = urb->iso_frame_desc[i].status;
 159                 if (st) {
 160                         PDEBUG(D_ERR,
 161                                 "ISOC data error: [%d] len=%d, status=%d",
 162                                 i, len, st);
 163                         gspca_dev->last_packet_type = DISCARD_PACKET;
 164                         continue;
 165                 }
 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);
 170                 data = (u8 *) urb->transfer_buffer
 171                                         + urb->iso_frame_desc[i].offset;
 172                 pkt_scan(gspca_dev, frame, data, len);
 173         }
 174
 175         /* resubmit the URB */
 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
 181 /*
 182  * ISOC message interrupt from the USB device
 183  *
 184  * Analyse each packet and call the subdriver for copy to the frame buffer.
 185  */
 186 static void isoc_irq(struct urb *urb)
 187 {
 188         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 189
 190         PDEBUG(D_PACK, "isoc irq");
 191         if (!gspca_dev->streaming)
 192                 return;
 193         fill_frame(gspca_dev, urb);
 194 }
 195
 196 /*
 197  * bulk message interrupt from the USB device
 198  */
 199 static void bulk_irq(struct urb *urb)
 200 {
 201         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 202         struct gspca_frame *frame;
 203         int st;
 204
 205         PDEBUG(D_PACK, "bulk irq");
 206         if (!gspca_dev->streaming)
 207                 return;
 208         switch (urb->status) {
 209         case 0:
 210                 break;
 211         case -ECONNRESET:
 212                 urb->status = 0;
 213                 break;
 214         default:
 215 #ifdef CONFIG_PM
 216                 if (!gspca_dev->frozen)
 217 #endif
 218                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 219                 return;         /* disconnection ? */
 220         }
 221
 222         /* check the availability of the frame buffer */
 223         frame = gspca_get_i_frame(gspca_dev);
 224         if (!frame) {
 225                 gspca_dev->last_packet_type = DISCARD_PACKET;
 226         } else {
 227                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 228                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 229                                         frame,
 230                                         urb->transfer_buffer,
 231                                         urb->actual_length);
 232         }
 233
 234         /* resubmit the URB */
 235         if (gspca_dev->cam.bulk_nurbs != 0) {
 236                 st = usb_submit_urb(urb, GFP_ATOMIC);
 237                 if (st < 0)
 238                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 239         }
 240 }
 241
 242 /*
 243  * add data to the current frame
 244  *
 245  * This function is called by the subdrivers at interrupt level.
 246  *
 247  * To build a frame, these ones must add
 248  *      - one FIRST_PACKET
 249  *      - 0 or many INTER_PACKETs
 250  *      - one LAST_PACKET
 251  * DISCARD_PACKET invalidates the whole frame.
 252  * On LAST_PACKET, a new frame is returned.
 253  */
 254 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 255                                     enum gspca_packet_type packet_type,
 256                                     struct gspca_frame *frame,
 257                                     const __u8 *data,
 258                                     int len)
 259 {
 260         int i, j;
 261
 262         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 263
 264         /* when start of a new frame, if the current frame buffer
 265          * is not queued, discard the whole frame */
 266         if (packet_type == FIRST_PACKET) {
 267                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 268                                                 != V4L2_BUF_FLAG_QUEUED) {
 269                         gspca_dev->last_packet_type = DISCARD_PACKET;
 270                         return frame;
 271                 }
 272                 frame->data_end = frame->data;
 273                 jiffies_to_timeval(get_jiffies_64(),
 274                                    &frame->v4l2_buf.timestamp);
 275                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 276         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 277                 if (packet_type == LAST_PACKET)
 278                         gspca_dev->last_packet_type = packet_type;
 279                 return frame;
 280         }
 281
 282         /* append the packet to the frame buffer */
 283         if (len > 0) {
 284                 if (frame->data_end - frame->data + len
 285                                                  > frame->v4l2_buf.length) {
 286                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 287                                 frame->data_end - frame->data + len,
 288                                 frame->v4l2_buf.length);
 289                         packet_type = DISCARD_PACKET;
 290                 } else {
 291                         memcpy(frame->data_end, data, len);
 292                         frame->data_end += len;
 293                 }
 294         }
 295         gspca_dev->last_packet_type = packet_type;
 296
 297         /* if last packet, wake up the application and advance in the queue */
 298         if (packet_type == LAST_PACKET) {
 299                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 300                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 301                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 302                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 303                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 304                 gspca_dev->fr_i = i;
 305                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 306                         frame->v4l2_buf.bytesused,
 307                         gspca_dev->fr_q,
 308                         i,
 309                         gspca_dev->fr_o);
 310                 j = gspca_dev->fr_queue[i];
 311                 frame = &gspca_dev->frame[j];
 312         }
 313         return frame;
 314 }
 315 EXPORT_SYMBOL(gspca_frame_add);
 316
 317 static int gspca_is_compressed(__u32 format)
 318 {
 319         switch (format) {
 320         case V4L2_PIX_FMT_MJPEG:
 321         case V4L2_PIX_FMT_JPEG:
 322         case V4L2_PIX_FMT_SPCA561:
 323         case V4L2_PIX_FMT_PAC207:
 324         case V4L2_PIX_FMT_MR97310A:
 325                 return 1;
 326         }
 327         return 0;
 328 }
 329
 330 static void *rvmalloc(unsigned long size)
 331 {
 332         void *mem;
 333         unsigned long adr;
 334
 335         mem = vmalloc_32(size);
 336         if (mem != NULL) {
 337                 adr = (unsigned long) mem;
 338                 while ((long) size > 0) {
 339                         SetPageReserved(vmalloc_to_page((void *) adr));
 340                         adr += PAGE_SIZE;
 341                         size -= PAGE_SIZE;
 342                 }
 343         }
 344         return mem;
 345 }
 346
 347 static void rvfree(void *mem, long size)
 348 {
 349         unsigned long adr;
 350
 351         adr = (unsigned long) mem;
 352         while (size > 0) {
 353                 ClearPageReserved(vmalloc_to_page((void *) adr));
 354                 adr += PAGE_SIZE;
 355                 size -= PAGE_SIZE;
 356         }
 357         vfree(mem);
 358 }
 359
 360 static int frame_alloc(struct gspca_dev *gspca_dev,
 361                         unsigned int count)
 362 {
 363         struct gspca_frame *frame;
 364         unsigned int frsz;
 365         int i;
 366
 367         i = gspca_dev->curr_mode;
 368         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 369         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 370         frsz = PAGE_ALIGN(frsz);
 371         gspca_dev->frsz = frsz;
 372         if (count > GSPCA_MAX_FRAMES)
 373                 count = GSPCA_MAX_FRAMES;
 374         gspca_dev->frbuf = rvmalloc(frsz * count);
 375         if (!gspca_dev->frbuf) {
 376                 err("frame alloc failed");
 377                 return -ENOMEM;
 378         }
 379         gspca_dev->nframes = count;
 380         for (i = 0; i < count; i++) {
 381                 frame = &gspca_dev->frame[i];
 382                 frame->v4l2_buf.index = i;
 383                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 384                 frame->v4l2_buf.flags = 0;
 385                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 386                 frame->v4l2_buf.length = frsz;
 387                 frame->v4l2_buf.memory = gspca_dev->memory;
 388                 frame->v4l2_buf.sequence = 0;
 389                 frame->data = frame->data_end =
 390                                         gspca_dev->frbuf + i * frsz;
 391                 frame->v4l2_buf.m.offset = i * frsz;
 392         }
 393         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 394         gspca_dev->last_packet_type = DISCARD_PACKET;
 395         gspca_dev->sequence = 0;
 396         return 0;
 397 }
 398
 399 static void frame_free(struct gspca_dev *gspca_dev)
 400 {
 401         int i;
 402
 403         PDEBUG(D_STREAM, "frame free");
 404         if (gspca_dev->frbuf != NULL) {
 405                 rvfree(gspca_dev->frbuf,
 406                         gspca_dev->nframes * gspca_dev->frsz);
 407                 gspca_dev->frbuf = NULL;
 408                 for (i = 0; i < gspca_dev->nframes; i++)
 409                         gspca_dev->frame[i].data = NULL;
 410         }
 411         gspca_dev->nframes = 0;
 412 }
 413
 414 static void destroy_urbs(struct gspca_dev *gspca_dev)
 415 {
 416         struct urb *urb;
 417         unsigned int i;
 418
 419         PDEBUG(D_STREAM, "kill transfer");
 420         for (i = 0; i < MAX_NURBS; i++) {
 421                 urb = gspca_dev->urb[i];
 422                 if (urb == NULL)
 423                         break;
 424
 425                 BUG_ON(!gspca_dev->dev);
 426                 gspca_dev->urb[i] = NULL;
 427                 if (!gspca_dev->present)
 428                         usb_kill_urb(urb);
 429                 if (urb->transfer_buffer != NULL)
 430                         usb_buffer_free(gspca_dev->dev,
 431                                         urb->transfer_buffer_length,
 432                                         urb->transfer_buffer,
 433                                         urb->transfer_dma);
 434                 usb_free_urb(urb);
 435         }
 436 }
 437
 438 /*
 439  * look for an input transfer endpoint in an alternate setting
 440  */
 441 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 442                                           __u8 xfer)
 443 {
 444         struct usb_host_endpoint *ep;
 445         int i, attr;
 446
 447         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 448                 ep = &alt->endpoint[i];
 449                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 450                 if (attr == xfer)
 451                         return ep;
 452         }
 453         return NULL;
 454 }
 455
 456 /*
 457  * look for an input (isoc or bulk) endpoint
 458  *
 459  * The endpoint is defined by the subdriver.
 460  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 461  * This routine may be called many times when the bandwidth is too small
 462  * (the bandwidth is checked on urb submit).
 463  */
 464 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 465 {
 466         struct usb_interface *intf;
 467         struct usb_host_endpoint *ep;
 468         int i, ret;
 469
 470         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 471         ep = NULL;
 472         i = gspca_dev->alt;                     /* previous alt setting */
 473
 474         /* try isoc */
 475         while (--i > 0) {                       /* alt 0 is unusable */
 476                 ep = alt_xfer(&intf->altsetting[i],
 477                                 USB_ENDPOINT_XFER_ISOC);
 478                 if (ep)
 479                         break;
 480         }
 481
 482         /* if no isoc, try bulk */
 483         if (ep == NULL) {
 484                 ep = alt_xfer(&intf->altsetting[0],
 485                                 USB_ENDPOINT_XFER_BULK);
 486                 if (ep == NULL) {
 487                         err("no transfer endpoint found");
 488                         return NULL;
 489                 }
 490         }
 491         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 492                         i, ep->desc.bEndpointAddress);
 493         if (i > 0) {
 494                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 495                 if (ret < 0) {
 496                         err("set interface err %d", ret);
 497                         return NULL;
 498                 }
 499         }
 500         gspca_dev->alt = i;             /* memorize the current alt setting */
 501         return ep;
 502 }
 503
 504 /*
 505  * create the URBs for image transfer
 506  */
 507 static int create_urbs(struct gspca_dev *gspca_dev,
 508                         struct usb_host_endpoint *ep)
 509 {
 510         struct urb *urb;
 511         int n, nurbs, i, psize, npkt, bsize;
 512
 513         /* calculate the packet size and the number of packets */
 514         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 515
 516         if (gspca_dev->alt != 0) {              /* isoc */
 517
 518                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 519                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 520                 npkt = ISO_MAX_SIZE / psize;
 521                 if (npkt > ISO_MAX_PKT)
 522                         npkt = ISO_MAX_PKT;
 523                 bsize = psize * npkt;
 524                 PDEBUG(D_STREAM,
 525                         "isoc %d pkts size %d = bsize:%d",
 526                         npkt, psize, bsize);
 527                 nurbs = DEF_NURBS;
 528         } else {                                /* bulk */
 529                 npkt = 0;
 530                 bsize = gspca_dev->cam.bulk_size;
 531                 if (bsize == 0)
 532                         bsize = psize;
 533                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 534                 if (gspca_dev->cam.bulk_nurbs != 0)
 535                         nurbs = gspca_dev->cam.bulk_nurbs;
 536                 else
 537                         nurbs = 1;
 538         }
 539
 540         gspca_dev->nurbs = nurbs;
 541         for (n = 0; n < nurbs; n++) {
 542                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 543                 if (!urb) {
 544                         err("usb_alloc_urb failed");
 545                         destroy_urbs(gspca_dev);
 546                         return -ENOMEM;
 547                 }
 548                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 549                                                 bsize,
 550                                                 GFP_KERNEL,
 551                                                 &urb->transfer_dma);
 552
 553                 if (urb->transfer_buffer == NULL) {
 554                         usb_free_urb(urb);
 555                         err("usb_buffer_urb failed");
 556                         destroy_urbs(gspca_dev);
 557                         return -ENOMEM;
 558                 }
 559                 gspca_dev->urb[n] = urb;
 560                 urb->dev = gspca_dev->dev;
 561                 urb->context = gspca_dev;
 562                 urb->transfer_buffer_length = bsize;
 563                 if (npkt != 0) {                /* ISOC */
 564                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 565                                                     ep->desc.bEndpointAddress);
 566                         urb->transfer_flags = URB_ISO_ASAP
 567                                         | URB_NO_TRANSFER_DMA_MAP;
 568                         urb->interval = ep->desc.bInterval;
 569                         urb->complete = isoc_irq;
 570                         urb->number_of_packets = npkt;
 571                         for (i = 0; i < npkt; i++) {
 572                                 urb->iso_frame_desc[i].length = psize;
 573                                 urb->iso_frame_desc[i].offset = psize * i;
 574                         }
 575                 } else {                /* bulk */
 576                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 577                                                 ep->desc.bEndpointAddress),
 578                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 579                         urb->complete = bulk_irq;
 580                 }
 581         }
 582         return 0;
 583 }
 584
 585 /*
 586  * start the USB transfer
 587  */
 588 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 589 {
 590         struct usb_host_endpoint *ep;
 591         int n, ret;
 592
 593         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 594                 return -ERESTARTSYS;
 595
 596         /* set the higher alternate setting and
 597          * loop until urb submit succeeds */
 598         gspca_dev->alt = gspca_dev->nbalt;
 599         for (;;) {
 600                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 601                 ep = get_ep(gspca_dev);
 602                 if (ep == NULL) {
 603                         ret = -EIO;
 604                         goto out;
 605                 }
 606                 ret = create_urbs(gspca_dev, ep);
 607                 if (ret < 0)
 608                         goto out;
 609
 610                 /* clear the bulk endpoint */
 611                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 612                         usb_clear_halt(gspca_dev->dev,
 613                                         gspca_dev->urb[0]->pipe);
 614
 615                 /* start the cam */
 616                 ret = gspca_dev->sd_desc->start(gspca_dev);
 617                 if (ret < 0) {
 618                         destroy_urbs(gspca_dev);
 619                         goto out;
 620                 }
 621                 gspca_dev->streaming = 1;
 622
 623                 /* some bulk transfers are started by the subdriver */
 624                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
 625                         break;
 626
 627                 /* submit the URBs */
 628                 for (n = 0; n < gspca_dev->nurbs; n++) {
 629                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 630                         if (ret < 0) {
 631                                 PDEBUG(D_ERR|D_STREAM,
 632                                         "usb_submit_urb [%d] err %d", n, ret);
 633                                 gspca_dev->streaming = 0;
 634                                 destroy_urbs(gspca_dev);
 635                                 if (ret == -ENOSPC) {
 636                                         msleep(20);     /* wait for kill
 637                                                          * complete */
 638                                         break;  /* try the previous alt */
 639                                 }
 640                                 goto out;
 641                         }
 642                 }
 643                 if (ret >= 0)
 644                         break;
 645         }
 646 out:
 647         mutex_unlock(&gspca_dev->usb_lock);
 648         return ret;
 649 }
 650
 651 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 652 {
 653         int ret;
 654
 655         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 656         if (ret < 0)
 657                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 658         return ret;
 659 }
 660
 661 /* Note: both the queue and the usb locks should be held when calling this */
 662 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 663 {
 664         gspca_dev->streaming = 0;
 665         if (gspca_dev->present
 666             && gspca_dev->sd_desc->stopN)
 667                 gspca_dev->sd_desc->stopN(gspca_dev);
 668         destroy_urbs(gspca_dev);
 669         if (gspca_dev->present)
 670                 gspca_set_alt0(gspca_dev);
 671         if (gspca_dev->sd_desc->stop0)
 672                 gspca_dev->sd_desc->stop0(gspca_dev);
 673         PDEBUG(D_STREAM, "stream off OK");
 674 }
 675
 676 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 677 {
 678         int i;
 679
 680         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 681         gspca_dev->curr_mode = i;
 682         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 683         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 684         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 685 }
 686
 687 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 688                         int width, int height)
 689 {
 690         int i;
 691
 692         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 693                 if (width >= gspca_dev->cam.cam_mode[i].width
 694                     && height >= gspca_dev->cam.cam_mode[i].height)
 695                         break;
 696         }
 697         return i;
 698 }
 699
 700 /*
 701  * search a mode with the right pixel format
 702  */
 703 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 704                         int mode,
 705                         int pixfmt)
 706 {
 707         int modeU, modeD;
 708
 709         modeU = modeD = mode;
 710         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 711                 if (--modeD >= 0) {
 712                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 713                                                                 == pixfmt)
 714                                 return modeD;
 715                 }
 716                 if (++modeU < gspca_dev->cam.nmodes) {
 717                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 718                                                                 == pixfmt)
 719                                 return modeU;
 720                 }
 721         }
 722         return -EINVAL;
 723 }
 724
 725 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 726                                 struct v4l2_fmtdesc *fmtdesc)
 727 {
 728         struct gspca_dev *gspca_dev = priv;
 729         int i, j, index;
 730         __u32 fmt_tb[8];
 731
 732         /* give an index to each format */
 733         index = 0;
 734         j = 0;
 735         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 736                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 737                 j = 0;
 738                 for (;;) {
 739                         if (fmt_tb[j] == fmt_tb[index])
 740                                 break;
 741                         j++;
 742                 }
 743                 if (j == index) {
 744                         if (fmtdesc->index == index)
 745                                 break;          /* new format */
 746                         index++;
 747                         if (index >= ARRAY_SIZE(fmt_tb))
 748                                 return -EINVAL;
 749                 }
 750         }
 751         if (i < 0)
 752                 return -EINVAL;         /* no more format */
 753
 754         fmtdesc->pixelformat = fmt_tb[index];
 755         if (gspca_is_compressed(fmt_tb[index]))
 756                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 757         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 758         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 759         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 760         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 761         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 762         fmtdesc->description[4] = '\0';
 763         return 0;
 764 }
 765
 766 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 767                             struct v4l2_format *fmt)
 768 {
 769         struct gspca_dev *gspca_dev = priv;
 770         int mode;
 771
 772         mode = gspca_dev->curr_mode;
 773         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 774                 sizeof fmt->fmt.pix);
 775         return 0;
 776 }
 777
 778 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 779                         struct v4l2_format *fmt)
 780 {
 781         int w, h, mode, mode2;
 782
 783         w = fmt->fmt.pix.width;
 784         h = fmt->fmt.pix.height;
 785
 786 #ifdef GSPCA_DEBUG
 787         if (gspca_debug & D_CONF)
 788                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 789 #endif
 790         /* search the closest mode for width and height */
 791         mode = wxh_to_mode(gspca_dev, w, h);
 792
 793         /* OK if right palette */
 794         if (gspca_dev->cam.cam_mode[mode].pixelformat
 795                                                 != fmt->fmt.pix.pixelformat) {
 796
 797                 /* else, search the closest mode with the same pixel format */
 798                 mode2 = gspca_get_mode(gspca_dev, mode,
 799                                         fmt->fmt.pix.pixelformat);
 800                 if (mode2 >= 0)
 801                         mode = mode2;
 802 /*              else
 803                         ;                * no chance, return this mode */
 804         }
 805         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 806                 sizeof fmt->fmt.pix);
 807         return mode;                    /* used when s_fmt */
 808 }
 809
 810 static int vidioc_try_fmt_vid_cap(struct file *file,
 811                               void *priv,
 812                               struct v4l2_format *fmt)
 813 {
 814         struct gspca_dev *gspca_dev = priv;
 815         int ret;
 816
 817         ret = try_fmt_vid_cap(gspca_dev, fmt);
 818         if (ret < 0)
 819                 return ret;
 820         return 0;
 821 }
 822
 823 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 824                             struct v4l2_format *fmt)
 825 {
 826         struct gspca_dev *gspca_dev = priv;
 827         int ret;
 828
 829         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 830                 return -ERESTARTSYS;
 831
 832         ret = try_fmt_vid_cap(gspca_dev, fmt);
 833         if (ret < 0)
 834                 goto out;
 835
 836         if (gspca_dev->nframes != 0
 837             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 838                 ret = -EINVAL;
 839                 goto out;
 840         }
 841
 842         if (ret == gspca_dev->curr_mode) {
 843                 ret = 0;
 844                 goto out;                       /* same mode */
 845         }
 846
 847         if (gspca_dev->streaming) {
 848                 ret = -EBUSY;
 849                 goto out;
 850         }
 851         gspca_dev->width = fmt->fmt.pix.width;
 852         gspca_dev->height = fmt->fmt.pix.height;
 853         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 854         gspca_dev->curr_mode = ret;
 855
 856         ret = 0;
 857 out:
 858         mutex_unlock(&gspca_dev->queue_lock);
 859         return ret;
 860 }
 861
 862 static void gspca_release(struct video_device *vfd)
 863 {
 864         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 865
 866         PDEBUG(D_STREAM, "device released");
 867
 868         kfree(gspca_dev->usb_buf);
 869         kfree(gspca_dev);
 870 }
 871
 872 static int dev_open(struct file *file)
 873 {
 874         struct gspca_dev *gspca_dev;
 875         int ret;
 876
 877         PDEBUG(D_STREAM, "%s open", current->comm);
 878         gspca_dev = (struct gspca_dev *) video_devdata(file);
 879         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 880                 return -ERESTARTSYS;
 881         if (!gspca_dev->present) {
 882                 ret = -ENODEV;
 883                 goto out;
 884         }
 885
 886         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 887                 ret = -EBUSY;
 888                 goto out;
 889         }
 890
 891         /* protect the subdriver against rmmod */
 892         if (!try_module_get(gspca_dev->module)) {
 893                 ret = -ENODEV;
 894                 goto out;
 895         }
 896
 897         gspca_dev->users++;
 898
 899         file->private_data = gspca_dev;
 900 #ifdef GSPCA_DEBUG
 901         /* activate the v4l2 debug */
 902         if (gspca_debug & D_V4L2)
 903                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 904                                         | V4L2_DEBUG_IOCTL_ARG;
 905         else
 906                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 907                                         | V4L2_DEBUG_IOCTL_ARG);
 908 #endif
 909         ret = 0;
 910 out:
 911         mutex_unlock(&gspca_dev->queue_lock);
 912         if (ret != 0)
 913                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 914         else
 915                 PDEBUG(D_STREAM, "open done");
 916         return ret;
 917 }
 918
 919 static int dev_close(struct file *file)
 920 {
 921         struct gspca_dev *gspca_dev = file->private_data;
 922
 923         PDEBUG(D_STREAM, "%s close", current->comm);
 924         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 925                 return -ERESTARTSYS;
 926         gspca_dev->users--;
 927
 928         /* if the file did the capture, free the streaming resources */
 929         if (gspca_dev->capt_file == file) {
 930                 if (gspca_dev->streaming) {
 931                         mutex_lock(&gspca_dev->usb_lock);
 932                         gspca_stream_off(gspca_dev);
 933                         mutex_unlock(&gspca_dev->usb_lock);
 934                 }
 935                 frame_free(gspca_dev);
 936                 gspca_dev->capt_file = NULL;
 937                 gspca_dev->memory = GSPCA_MEMORY_NO;
 938         }
 939         file->private_data = NULL;
 940         module_put(gspca_dev->module);
 941         mutex_unlock(&gspca_dev->queue_lock);
 942
 943         PDEBUG(D_STREAM, "close done");
 944
 945         return 0;
 946 }
 947
 948 static int vidioc_querycap(struct file *file, void  *priv,
 949                            struct v4l2_capability *cap)
 950 {
 951         struct gspca_dev *gspca_dev = priv;
 952
 953         memset(cap, 0, sizeof *cap);
 954         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 955         if (gspca_dev->dev->product != NULL) {
 956                 strncpy(cap->card, gspca_dev->dev->product,
 957                         sizeof cap->card);
 958         } else {
 959                 snprintf(cap->card, sizeof cap->card,
 960                         "USB Camera (%04x:%04x)",
 961                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 962                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 963         }
 964         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 965                 sizeof cap->bus_info);
 966         cap->version = DRIVER_VERSION_NUMBER;
 967         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 968                           | V4L2_CAP_STREAMING
 969                           | V4L2_CAP_READWRITE;
 970         return 0;
 971 }
 972
 973 static int vidioc_queryctrl(struct file *file, void *priv,
 974                            struct v4l2_queryctrl *q_ctrl)
 975 {
 976         struct gspca_dev *gspca_dev = priv;
 977         int i, ix;
 978         u32 id;
 979
 980         ix = -1;
 981         id = q_ctrl->id;
 982         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 983                 id &= V4L2_CTRL_ID_MASK;
 984                 id++;
 985                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 986                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 987                                 continue;
 988                         if (ix < 0) {
 989                                 ix = i;
 990                                 continue;
 991                         }
 992                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 993                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 994                                 continue;
 995                         ix = i;
 996                 }
 997         }
 998         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 999                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1000                         ix = i;
1001                         break;
1002                 }
1003         }
1004         if (ix < 0)
1005                 return -EINVAL;
1006         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1007                 sizeof *q_ctrl);
1008         if (gspca_dev->ctrl_dis & (1 << ix))
1009                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1010         return 0;
1011 }
1012
1013 static int vidioc_s_ctrl(struct file *file, void *priv,
1014                          struct v4l2_control *ctrl)
1015 {
1016         struct gspca_dev *gspca_dev = priv;
1017         const struct ctrl *ctrls;
1018         int i, ret;
1019
1020         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1021              i < gspca_dev->sd_desc->nctrls;
1022              i++, ctrls++) {
1023                 if (ctrl->id != ctrls->qctrl.id)
1024                         continue;
1025                 if (gspca_dev->ctrl_dis & (1 << i))
1026                         return -EINVAL;
1027                 if (ctrl->value < ctrls->qctrl.minimum
1028                     || ctrl->value > ctrls->qctrl.maximum)
1029                         return -ERANGE;
1030                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1031                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1032                         return -ERESTARTSYS;
1033                 ret = ctrls->set(gspca_dev, ctrl->value);
1034                 mutex_unlock(&gspca_dev->usb_lock);
1035                 return ret;
1036         }
1037         return -EINVAL;
1038 }
1039
1040 static int vidioc_g_ctrl(struct file *file, void *priv,
1041                          struct v4l2_control *ctrl)
1042 {
1043         struct gspca_dev *gspca_dev = priv;
1044
1045         const struct ctrl *ctrls;
1046         int i, ret;
1047
1048         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1049              i < gspca_dev->sd_desc->nctrls;
1050              i++, ctrls++) {
1051                 if (ctrl->id != ctrls->qctrl.id)
1052                         continue;
1053                 if (gspca_dev->ctrl_dis & (1 << i))
1054                         return -EINVAL;
1055                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1056                         return -ERESTARTSYS;
1057                 ret = ctrls->get(gspca_dev, &ctrl->value);
1058                 mutex_unlock(&gspca_dev->usb_lock);
1059                 return ret;
1060         }
1061         return -EINVAL;
1062 }
1063
1064 /*fixme: have an audio flag in gspca_dev?*/
1065 static int vidioc_s_audio(struct file *file, void *priv,
1066                          struct v4l2_audio *audio)
1067 {
1068         if (audio->index != 0)
1069                 return -EINVAL;
1070         return 0;
1071 }
1072
1073 static int vidioc_g_audio(struct file *file, void *priv,
1074                          struct v4l2_audio *audio)
1075 {
1076         memset(audio, 0, sizeof *audio);
1077         strcpy(audio->name, "Microphone");
1078         return 0;
1079 }
1080
1081 static int vidioc_enumaudio(struct file *file, void *priv,
1082                          struct v4l2_audio *audio)
1083 {
1084         if (audio->index != 0)
1085                 return -EINVAL;
1086
1087         strcpy(audio->name, "Microphone");
1088         audio->capability = 0;
1089         audio->mode = 0;
1090         return 0;
1091 }
1092
1093 static int vidioc_querymenu(struct file *file, void *priv,
1094                             struct v4l2_querymenu *qmenu)
1095 {
1096         struct gspca_dev *gspca_dev = priv;
1097
1098         if (!gspca_dev->sd_desc->querymenu)
1099                 return -EINVAL;
1100         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1101 }
1102
1103 static int vidioc_enum_input(struct file *file, void *priv,
1104                                 struct v4l2_input *input)
1105 {
1106         struct gspca_dev *gspca_dev = priv;
1107
1108         if (input->index != 0)
1109                 return -EINVAL;
1110         memset(input, 0, sizeof *input);
1111         input->type = V4L2_INPUT_TYPE_CAMERA;
1112         strncpy(input->name, gspca_dev->sd_desc->name,
1113                 sizeof input->name);
1114         return 0;
1115 }
1116
1117 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1118 {
1119         *i = 0;
1120         return 0;
1121 }
1122
1123 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1124 {
1125         if (i > 0)
1126                 return -EINVAL;
1127         return (0);
1128 }
1129
1130 static int vidioc_reqbufs(struct file *file, void *priv,
1131                           struct v4l2_requestbuffers *rb)
1132 {
1133         struct gspca_dev *gspca_dev = priv;
1134         int i, ret = 0;
1135
1136         switch (rb->memory) {
1137         case GSPCA_MEMORY_READ:                 /* (internal call) */
1138         case V4L2_MEMORY_MMAP:
1139         case V4L2_MEMORY_USERPTR:
1140                 break;
1141         default:
1142                 return -EINVAL;
1143         }
1144         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1145                 return -ERESTARTSYS;
1146
1147         if (gspca_dev->memory != GSPCA_MEMORY_NO
1148             && gspca_dev->memory != rb->memory) {
1149                 ret = -EBUSY;
1150                 goto out;
1151         }
1152
1153         /* only one file may do the capture */
1154         if (gspca_dev->capt_file != NULL
1155             && gspca_dev->capt_file != file) {
1156                 ret = -EBUSY;
1157                 goto out;
1158         }
1159
1160         /* if allocated, the buffers must not be mapped */
1161         for (i = 0; i < gspca_dev->nframes; i++) {
1162                 if (gspca_dev->frame[i].vma_use_count) {
1163                         ret = -EBUSY;
1164                         goto out;
1165                 }
1166         }
1167
1168         /* stop streaming */
1169         if (gspca_dev->streaming) {
1170                 mutex_lock(&gspca_dev->usb_lock);
1171                 gspca_stream_off(gspca_dev);
1172                 mutex_unlock(&gspca_dev->usb_lock);
1173         }
1174
1175         /* free the previous allocated buffers, if any */
1176         if (gspca_dev->nframes != 0) {
1177                 frame_free(gspca_dev);
1178                 gspca_dev->capt_file = NULL;
1179         }
1180         if (rb->count == 0)                     /* unrequest */
1181                 goto out;
1182         gspca_dev->memory = rb->memory;
1183         ret = frame_alloc(gspca_dev, rb->count);
1184         if (ret == 0) {
1185                 rb->count = gspca_dev->nframes;
1186                 gspca_dev->capt_file = file;
1187         }
1188 out:
1189         mutex_unlock(&gspca_dev->queue_lock);
1190         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1191         return ret;
1192 }
1193
1194 static int vidioc_querybuf(struct file *file, void *priv,
1195                            struct v4l2_buffer *v4l2_buf)
1196 {
1197         struct gspca_dev *gspca_dev = priv;
1198         struct gspca_frame *frame;
1199
1200         if (v4l2_buf->index < 0
1201             || v4l2_buf->index >= gspca_dev->nframes)
1202                 return -EINVAL;
1203
1204         frame = &gspca_dev->frame[v4l2_buf->index];
1205         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1206         return 0;
1207 }
1208
1209 static int vidioc_streamon(struct file *file, void *priv,
1210                            enum v4l2_buf_type buf_type)
1211 {
1212         struct gspca_dev *gspca_dev = priv;
1213         int ret;
1214
1215         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1216                 return -EINVAL;
1217         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1218                 return -ERESTARTSYS;
1219         if (!gspca_dev->present) {
1220                 ret = -ENODEV;
1221                 goto out;
1222         }
1223         if (gspca_dev->nframes == 0
1224             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1225                 ret = -EINVAL;
1226                 goto out;
1227         }
1228         if (!gspca_dev->streaming) {
1229                 ret = gspca_init_transfer(gspca_dev);
1230                 if (ret < 0)
1231                         goto out;
1232         }
1233 #ifdef GSPCA_DEBUG
1234         if (gspca_debug & D_STREAM) {
1235                 PDEBUG_MODE("stream on OK",
1236                         gspca_dev->pixfmt,
1237                         gspca_dev->width,
1238                         gspca_dev->height);
1239         }
1240 #endif
1241         ret = 0;
1242 out:
1243         mutex_unlock(&gspca_dev->queue_lock);
1244         return ret;
1245 }
1246
1247 static int vidioc_streamoff(struct file *file, void *priv,
1248                                 enum v4l2_buf_type buf_type)
1249 {
1250         struct gspca_dev *gspca_dev = priv;
1251         int i, ret;
1252
1253         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1254                 return -EINVAL;
1255         if (!gspca_dev->streaming)
1256                 return 0;
1257         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1258                 return -ERESTARTSYS;
1259
1260         /* stop streaming */
1261         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1262                 ret = -ERESTARTSYS;
1263                 goto out;
1264         }
1265         gspca_stream_off(gspca_dev);
1266         mutex_unlock(&gspca_dev->usb_lock);
1267
1268         /* empty the application queues */
1269         for (i = 0; i < gspca_dev->nframes; i++)
1270                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1271         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1272         gspca_dev->last_packet_type = DISCARD_PACKET;
1273         gspca_dev->sequence = 0;
1274         ret = 0;
1275 out:
1276         mutex_unlock(&gspca_dev->queue_lock);
1277         return ret;
1278 }
1279
1280 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1281                         struct v4l2_jpegcompression *jpegcomp)
1282 {
1283         struct gspca_dev *gspca_dev = priv;
1284         int ret;
1285
1286         if (!gspca_dev->sd_desc->get_jcomp)
1287                 return -EINVAL;
1288         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1289                 return -ERESTARTSYS;
1290         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1291         mutex_unlock(&gspca_dev->usb_lock);
1292         return ret;
1293 }
1294
1295 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1296                         struct v4l2_jpegcompression *jpegcomp)
1297 {
1298         struct gspca_dev *gspca_dev = priv;
1299         int ret;
1300
1301         if (!gspca_dev->sd_desc->set_jcomp)
1302                 return -EINVAL;
1303         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1304                 return -ERESTARTSYS;
1305         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1306         mutex_unlock(&gspca_dev->usb_lock);
1307         return ret;
1308 }
1309
1310 static int vidioc_g_parm(struct file *filp, void *priv,
1311                         struct v4l2_streamparm *parm)
1312 {
1313         struct gspca_dev *gspca_dev = priv;
1314
1315         memset(parm, 0, sizeof *parm);
1316         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1317         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1318
1319         if (gspca_dev->sd_desc->get_streamparm) {
1320                 int ret;
1321
1322                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1323                         return -ERESTARTSYS;
1324                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1325                 mutex_unlock(&gspca_dev->usb_lock);
1326                 return ret;
1327         }
1328
1329         return 0;
1330 }
1331
1332 static int vidioc_s_parm(struct file *filp, void *priv,
1333                         struct v4l2_streamparm *parm)
1334 {
1335         struct gspca_dev *gspca_dev = priv;
1336         int n;
1337
1338         n = parm->parm.capture.readbuffers;
1339         if (n == 0 || n > GSPCA_MAX_FRAMES)
1340                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1341         else
1342                 gspca_dev->nbufread = n;
1343
1344         if (gspca_dev->sd_desc->set_streamparm) {
1345                 int ret;
1346
1347                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1348                         return -ERESTARTSYS;
1349                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1350                 mutex_unlock(&gspca_dev->usb_lock);
1351                 return ret;
1352         }
1353
1354         return 0;
1355 }
1356
1357 static int vidioc_s_std(struct file *filp, void *priv,
1358                         v4l2_std_id *parm)
1359 {
1360         return 0;
1361 }
1362
1363 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1364 static int vidiocgmbuf(struct file *file, void *priv,
1365                         struct video_mbuf *mbuf)
1366 {
1367         struct gspca_dev *gspca_dev = file->private_data;
1368         int i;
1369
1370         PDEBUG(D_STREAM, "cgmbuf");
1371         if (gspca_dev->nframes == 0) {
1372                 int ret;
1373
1374                 {
1375                         struct v4l2_format fmt;
1376
1377                         memset(&fmt, 0, sizeof fmt);
1378                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1379                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1380                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1381                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1382                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1383                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1384                         if (ret != 0)
1385                                 return ret;
1386                 }
1387                 {
1388                         struct v4l2_requestbuffers rb;
1389
1390                         memset(&rb, 0, sizeof rb);
1391                         rb.count = 4;
1392                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1393                         rb.memory = V4L2_MEMORY_MMAP;
1394                         ret = vidioc_reqbufs(file, priv, &rb);
1395                         if (ret != 0)
1396                                 return ret;
1397                 }
1398         }
1399         mbuf->frames = gspca_dev->nframes;
1400         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1401         for (i = 0; i < mbuf->frames; i++)
1402                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1403         return 0;
1404 }
1405 #endif
1406
1407 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1408 {
1409         struct gspca_dev *gspca_dev = file->private_data;
1410         struct gspca_frame *frame;
1411         struct page *page;
1412         unsigned long addr, start, size;
1413         int i, ret;
1414
1415         start = vma->vm_start;
1416         size = vma->vm_end - vma->vm_start;
1417         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1418
1419         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1420                 return -ERESTARTSYS;
1421         if (!gspca_dev->present) {
1422                 ret = -ENODEV;
1423                 goto out;
1424         }
1425         if (gspca_dev->capt_file != file) {
1426                 ret = -EINVAL;
1427                 goto out;
1428         }
1429
1430         frame = NULL;
1431         for (i = 0; i < gspca_dev->nframes; ++i) {
1432                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1433                         PDEBUG(D_STREAM, "mmap bad memory type");
1434                         break;
1435                 }
1436                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1437                                                 == vma->vm_pgoff) {
1438                         frame = &gspca_dev->frame[i];
1439                         break;
1440                 }
1441         }
1442         if (frame == NULL) {
1443                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1444                 ret = -EINVAL;
1445                 goto out;
1446         }
1447 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1448         /* v4l1 maps all the buffers */
1449         if (i != 0
1450             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1451 #endif
1452             if (size != frame->v4l2_buf.length) {
1453                 PDEBUG(D_STREAM, "mmap bad size");
1454                 ret = -EINVAL;
1455                 goto out;
1456         }
1457
1458         /*
1459          * - VM_IO marks the area as being a mmaped region for I/O to a
1460          *   device. It also prevents the region from being core dumped.
1461          */
1462         vma->vm_flags |= VM_IO;
1463
1464         addr = (unsigned long) frame->data;
1465         while (size > 0) {
1466                 page = vmalloc_to_page((void *) addr);
1467                 ret = vm_insert_page(vma, start, page);
1468                 if (ret < 0)
1469                         goto out;
1470                 start += PAGE_SIZE;
1471                 addr += PAGE_SIZE;
1472                 size -= PAGE_SIZE;
1473         }
1474
1475         vma->vm_ops = &gspca_vm_ops;
1476         vma->vm_private_data = frame;
1477         gspca_vm_open(vma);
1478         ret = 0;
1479 out:
1480         mutex_unlock(&gspca_dev->queue_lock);
1481         return ret;
1482 }
1483
1484 /*
1485  * wait for a video frame
1486  *
1487  * If a frame is ready, its index is returned.
1488  */
1489 static int frame_wait(struct gspca_dev *gspca_dev,
1490                         int nonblock_ing)
1491 {
1492         struct gspca_frame *frame;
1493         int i, j, ret;
1494
1495         /* check if a frame is ready */
1496         i = gspca_dev->fr_o;
1497         j = gspca_dev->fr_queue[i];
1498         frame = &gspca_dev->frame[j];
1499
1500         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1501                 if (nonblock_ing)
1502                         return -EAGAIN;
1503
1504                 /* wait till a frame is ready */
1505                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1506                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1507                         !gspca_dev->streaming || !gspca_dev->present,
1508                         msecs_to_jiffies(3000));
1509                 if (ret < 0)
1510                         return ret;
1511                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1512                         return -EIO;
1513         }
1514
1515         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1516         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1517                 gspca_dev->fr_q,
1518                 gspca_dev->fr_i,
1519                 gspca_dev->fr_o);
1520
1521         if (gspca_dev->sd_desc->dq_callback) {
1522                 mutex_lock(&gspca_dev->usb_lock);
1523                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1524                 mutex_unlock(&gspca_dev->usb_lock);
1525         }
1526         return j;
1527 }
1528
1529 /*
1530  * dequeue a video buffer
1531  *
1532  * If nonblock_ing is false, block until a buffer is available.
1533  */
1534 static int vidioc_dqbuf(struct file *file, void *priv,
1535                         struct v4l2_buffer *v4l2_buf)
1536 {
1537         struct gspca_dev *gspca_dev = priv;
1538         struct gspca_frame *frame;
1539         int i, ret;
1540
1541         PDEBUG(D_FRAM, "dqbuf");
1542         if (v4l2_buf->memory != gspca_dev->memory)
1543                 return -EINVAL;
1544
1545         /* if not streaming, be sure the application will not loop forever */
1546         if (!(file->f_flags & O_NONBLOCK)
1547             && !gspca_dev->streaming && gspca_dev->users == 1)
1548                 return -EINVAL;
1549
1550         /* only the capturing file may dequeue */
1551         if (gspca_dev->capt_file != file)
1552                 return -EINVAL;
1553
1554         /* only one dequeue / read at a time */
1555         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1556                 return -ERESTARTSYS;
1557
1558         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1559         if (ret < 0)
1560                 goto out;
1561         i = ret;                                /* frame index */
1562         frame = &gspca_dev->frame[i];
1563         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1564                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1565                                  frame->data,
1566                                  frame->v4l2_buf.bytesused)) {
1567                         PDEBUG(D_ERR|D_STREAM,
1568                                 "dqbuf cp to user failed");
1569                         ret = -EFAULT;
1570                         goto out;
1571                 }
1572         }
1573         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1574         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1575         PDEBUG(D_FRAM, "dqbuf %d", i);
1576         ret = 0;
1577 out:
1578         mutex_unlock(&gspca_dev->read_lock);
1579         return ret;
1580 }
1581
1582 /*
1583  * queue a video buffer
1584  *
1585  * Attempting to queue a buffer that has already been
1586  * queued will return -EINVAL.
1587  */
1588 static int vidioc_qbuf(struct file *file, void *priv,
1589                         struct v4l2_buffer *v4l2_buf)
1590 {
1591         struct gspca_dev *gspca_dev = priv;
1592         struct gspca_frame *frame;
1593         int i, index, ret;
1594
1595         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1596
1597         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1598                 return -ERESTARTSYS;
1599
1600         index = v4l2_buf->index;
1601         if ((unsigned) index >= gspca_dev->nframes) {
1602                 PDEBUG(D_FRAM,
1603                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1604                 ret = -EINVAL;
1605                 goto out;
1606         }
1607         if (v4l2_buf->memory != gspca_dev->memory) {
1608                 PDEBUG(D_FRAM, "qbuf bad memory type");
1609                 ret = -EINVAL;
1610                 goto out;
1611         }
1612
1613         frame = &gspca_dev->frame[index];
1614         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1615                 PDEBUG(D_FRAM, "qbuf bad state");
1616                 ret = -EINVAL;
1617                 goto out;
1618         }
1619
1620         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1621
1622         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1623                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1624                 frame->v4l2_buf.length = v4l2_buf->length;
1625         }
1626
1627         /* put the buffer in the 'queued' queue */
1628         i = gspca_dev->fr_q;
1629         gspca_dev->fr_queue[i] = index;
1630         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1631         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1632                 gspca_dev->fr_q,
1633                 gspca_dev->fr_i,
1634                 gspca_dev->fr_o);
1635
1636         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1637         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1638         ret = 0;
1639 out:
1640         mutex_unlock(&gspca_dev->queue_lock);
1641         return ret;
1642 }
1643
1644 /*
1645  * allocate the resources for read()
1646  */
1647 static int read_alloc(struct gspca_dev *gspca_dev,
1648                         struct file *file)
1649 {
1650         struct v4l2_buffer v4l2_buf;
1651         int i, ret;
1652
1653         PDEBUG(D_STREAM, "read alloc");
1654         if (gspca_dev->nframes == 0) {
1655                 struct v4l2_requestbuffers rb;
1656
1657                 memset(&rb, 0, sizeof rb);
1658                 rb.count = gspca_dev->nbufread;
1659                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1660                 rb.memory = GSPCA_MEMORY_READ;
1661                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1662                 if (ret != 0) {
1663                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1664                         return ret;
1665                 }
1666                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1667                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1668                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1669                 for (i = 0; i < gspca_dev->nbufread; i++) {
1670                         v4l2_buf.index = i;
1671                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1672                         if (ret != 0) {
1673                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1674                                 return ret;
1675                         }
1676                 }
1677                 gspca_dev->memory = GSPCA_MEMORY_READ;
1678         }
1679
1680         /* start streaming */
1681         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1682         if (ret != 0)
1683                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1684         return ret;
1685 }
1686
1687 static unsigned int dev_poll(struct file *file, poll_table *wait)
1688 {
1689         struct gspca_dev *gspca_dev = file->private_data;
1690         int i, ret;
1691
1692         PDEBUG(D_FRAM, "poll");
1693
1694         poll_wait(file, &gspca_dev->wq, wait);
1695         if (!gspca_dev->present)
1696                 return POLLERR;
1697
1698         /* if reqbufs is not done, the user would use read() */
1699         if (gspca_dev->nframes == 0) {
1700                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1701                         return POLLERR;         /* not the 1st time */
1702                 ret = read_alloc(gspca_dev, file);
1703                 if (ret != 0)
1704                         return POLLERR;
1705         }
1706
1707         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1708                 return POLLERR;
1709         if (!gspca_dev->present) {
1710                 ret = POLLERR;
1711                 goto out;
1712         }
1713
1714         /* check the next incoming buffer */
1715         i = gspca_dev->fr_o;
1716         i = gspca_dev->fr_queue[i];
1717         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1718                 ret = POLLIN | POLLRDNORM;      /* something to read */
1719         else
1720                 ret = 0;
1721 out:
1722         mutex_unlock(&gspca_dev->queue_lock);
1723         return ret;
1724 }
1725
1726 static ssize_t dev_read(struct file *file, char __user *data,
1727                     size_t count, loff_t *ppos)
1728 {
1729         struct gspca_dev *gspca_dev = file->private_data;
1730         struct gspca_frame *frame;
1731         struct v4l2_buffer v4l2_buf;
1732         struct timeval timestamp;
1733         int n, ret, ret2;
1734
1735         PDEBUG(D_FRAM, "read (%zd)", count);
1736         if (!gspca_dev->present)
1737                 return -ENODEV;
1738         switch (gspca_dev->memory) {
1739         case GSPCA_MEMORY_NO:                   /* first time */
1740                 ret = read_alloc(gspca_dev, file);
1741                 if (ret != 0)
1742                         return ret;
1743                 break;
1744         case GSPCA_MEMORY_READ:
1745                 if (gspca_dev->capt_file == file)
1746                         break;
1747                 /* fall thru */
1748         default:
1749                 return -EINVAL;
1750         }
1751
1752         /* get a frame */
1753         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1754         timestamp.tv_sec--;
1755         n = 2;
1756         for (;;) {
1757                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1758                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1759                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1760                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1761                 if (ret != 0) {
1762                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1763                         return ret;
1764                 }
1765
1766                 /* if the process slept for more than 1 second,
1767                  * get a newer frame */
1768                 frame = &gspca_dev->frame[v4l2_buf.index];
1769                 if (--n < 0)
1770                         break;                  /* avoid infinite loop */
1771                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1772                         break;
1773                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1774                 if (ret != 0) {
1775                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1776                         return ret;
1777                 }
1778         }
1779
1780         /* copy the frame */
1781         if (count > frame->v4l2_buf.bytesused)
1782                 count = frame->v4l2_buf.bytesused;
1783         ret = copy_to_user(data, frame->data, count);
1784         if (ret != 0) {
1785                 PDEBUG(D_ERR|D_STREAM,
1786                         "read cp to user lack %d / %zd", ret, count);
1787                 ret = -EFAULT;
1788                 goto out;
1789         }
1790         ret = count;
1791 out:
1792         /* in each case, requeue the buffer */
1793         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1794         if (ret2 != 0)
1795                 return ret2;
1796         return ret;
1797 }
1798
1799 static struct v4l2_file_operations dev_fops = {
1800         .owner = THIS_MODULE,
1801         .open = dev_open,
1802         .release = dev_close,
1803         .read = dev_read,
1804         .mmap = dev_mmap,
1805         .unlocked_ioctl = video_ioctl2,
1806         .poll   = dev_poll,
1807 };
1808
1809 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1810         .vidioc_querycap        = vidioc_querycap,
1811         .vidioc_dqbuf           = vidioc_dqbuf,
1812         .vidioc_qbuf            = vidioc_qbuf,
1813         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1814         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1815         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1816         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1817         .vidioc_streamon        = vidioc_streamon,
1818         .vidioc_queryctrl       = vidioc_queryctrl,
1819         .vidioc_g_ctrl          = vidioc_g_ctrl,
1820         .vidioc_s_ctrl          = vidioc_s_ctrl,
1821         .vidioc_g_audio         = vidioc_g_audio,
1822         .vidioc_s_audio         = vidioc_s_audio,
1823         .vidioc_enumaudio       = vidioc_enumaudio,
1824         .vidioc_querymenu       = vidioc_querymenu,
1825         .vidioc_enum_input      = vidioc_enum_input,
1826         .vidioc_g_input         = vidioc_g_input,
1827         .vidioc_s_input         = vidioc_s_input,
1828         .vidioc_reqbufs         = vidioc_reqbufs,
1829         .vidioc_querybuf        = vidioc_querybuf,
1830         .vidioc_streamoff       = vidioc_streamoff,
1831         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1832         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1833         .vidioc_g_parm          = vidioc_g_parm,
1834         .vidioc_s_parm          = vidioc_s_parm,
1835         .vidioc_s_std           = vidioc_s_std,
1836 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1837         .vidiocgmbuf          = vidiocgmbuf,
1838 #endif
1839 };
1840
1841 static struct video_device gspca_template = {
1842         .name = "gspca main driver",
1843         .fops = &dev_fops,
1844         .ioctl_ops = &dev_ioctl_ops,
1845         .release = gspca_release,
1846         .minor = -1,
1847 };
1848
1849 /*
1850  * probe and create a new gspca device
1851  *
1852  * This function must be called by the sub-driver when it is
1853  * called for probing a new device.
1854  */
1855 int gspca_dev_probe(struct usb_interface *intf,
1856                 const struct usb_device_id *id,
1857                 const struct sd_desc *sd_desc,
1858                 int dev_size,
1859                 struct module *module)
1860 {
1861         struct usb_interface_descriptor *interface;
1862         struct gspca_dev *gspca_dev;
1863         struct usb_device *dev = interface_to_usbdev(intf);
1864         int ret;
1865
1866         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1867
1868         /* we don't handle multi-config cameras */
1869         if (dev->descriptor.bNumConfigurations != 1)
1870                 return -ENODEV;
1871         interface = &intf->cur_altsetting->desc;
1872         if (interface->bInterfaceNumber > 0)
1873                 return -ENODEV;
1874
1875         /* create the device */
1876         if (dev_size < sizeof *gspca_dev)
1877                 dev_size = sizeof *gspca_dev;
1878         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1879         if (!gspca_dev) {
1880                 err("couldn't kzalloc gspca struct");
1881                 return -ENOMEM;
1882         }
1883         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1884         if (!gspca_dev->usb_buf) {
1885                 err("out of memory");
1886                 ret = -ENOMEM;
1887                 goto out;
1888         }
1889         gspca_dev->dev = dev;
1890         gspca_dev->iface = interface->bInterfaceNumber;
1891         gspca_dev->nbalt = intf->num_altsetting;
1892         gspca_dev->sd_desc = sd_desc;
1893         gspca_dev->nbufread = 2;
1894         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1895
1896         /* configure the subdriver and initialize the USB device */
1897         ret = sd_desc->config(gspca_dev, id);
1898         if (ret < 0)
1899                 goto out;
1900         ret = sd_desc->init(gspca_dev);
1901         if (ret < 0)
1902                 goto out;
1903         ret = gspca_set_alt0(gspca_dev);
1904         if (ret < 0)
1905                 goto out;
1906         gspca_set_default_mode(gspca_dev);
1907
1908         mutex_init(&gspca_dev->usb_lock);
1909         mutex_init(&gspca_dev->read_lock);
1910         mutex_init(&gspca_dev->queue_lock);
1911         init_waitqueue_head(&gspca_dev->wq);
1912
1913         /* init video stuff */
1914         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1915         gspca_dev->vdev.parent = &dev->dev;
1916         gspca_dev->module = module;
1917         gspca_dev->present = 1;
1918         ret = video_register_device(&gspca_dev->vdev,
1919                                   VFL_TYPE_GRABBER,
1920                                   -1);
1921         if (ret < 0) {
1922                 err("video_register_device err %d", ret);
1923                 goto out;
1924         }
1925
1926         usb_set_intfdata(intf, gspca_dev);
1927         PDEBUG(D_PROBE, "probe ok");
1928         return 0;
1929 out:
1930         kfree(gspca_dev->usb_buf);
1931         kfree(gspca_dev);
1932         return ret;
1933 }
1934 EXPORT_SYMBOL(gspca_dev_probe);
1935
1936 /*
1937  * USB disconnection
1938  *
1939  * This function must be called by the sub-driver
1940  * when the device disconnects, after the specific resources are freed.
1941  */
1942 void gspca_disconnect(struct usb_interface *intf)
1943 {
1944         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1945
1946         mutex_lock(&gspca_dev->usb_lock);
1947         gspca_dev->present = 0;
1948         mutex_unlock(&gspca_dev->usb_lock);
1949
1950         destroy_urbs(gspca_dev);
1951         gspca_dev->dev = NULL;
1952         usb_set_intfdata(intf, NULL);
1953
1954         /* release the device */
1955         /* (this will call gspca_release() immediatly or on last close) */
1956         video_unregister_device(&gspca_dev->vdev);
1957
1958         PDEBUG(D_PROBE, "disconnect complete");
1959 }
1960 EXPORT_SYMBOL(gspca_disconnect);
1961
1962 #ifdef CONFIG_PM
1963 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1964 {
1965         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1966
1967         if (!gspca_dev->streaming)
1968                 return 0;
1969         gspca_dev->frozen = 1;          /* avoid urb error messages */
1970         if (gspca_dev->sd_desc->stopN)
1971                 gspca_dev->sd_desc->stopN(gspca_dev);
1972         destroy_urbs(gspca_dev);
1973         gspca_set_alt0(gspca_dev);
1974         if (gspca_dev->sd_desc->stop0)
1975                 gspca_dev->sd_desc->stop0(gspca_dev);
1976         return 0;
1977 }
1978 EXPORT_SYMBOL(gspca_suspend);
1979
1980 int gspca_resume(struct usb_interface *intf)
1981 {
1982         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1983
1984         gspca_dev->frozen = 0;
1985         gspca_dev->sd_desc->init(gspca_dev);
1986         if (gspca_dev->streaming)
1987                 return gspca_init_transfer(gspca_dev);
1988         return 0;
1989 }
1990 EXPORT_SYMBOL(gspca_resume);
1991 #endif
1992 /* -- cam driver utility functions -- */
1993
1994 /* auto gain and exposure algorithm based on the knee algorithm described here:
1995    http://ytse.tricolour.net/docs/LowLightOptimization.html
1996
1997    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1998    where changed. */
1999 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2000         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2001 {
2002         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2003         const struct ctrl *gain_ctrl = NULL;
2004         const struct ctrl *exposure_ctrl = NULL;
2005         const struct ctrl *autogain_ctrl = NULL;
2006         int retval = 0;
2007
2008         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2009                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2010                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2011                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2012                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2013                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2014                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2015         }
2016         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2017                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2018                         "on cam without (auto)gain/exposure");
2019                 return 0;
2020         }
2021
2022         if (gain_ctrl->get(gspca_dev, &gain) ||
2023                         exposure_ctrl->get(gspca_dev, &exposure) ||
2024                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2025                 return 0;
2026
2027         orig_gain = gain;
2028         orig_exposure = exposure;
2029
2030         /* If we are of a multiple of deadzone, do multiple steps to reach the
2031            desired lumination fast (with the risc of a slight overshoot) */
2032         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2033
2034         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2035                 avg_lum, desired_avg_lum, steps);
2036
2037         for (i = 0; i < steps; i++) {
2038                 if (avg_lum > desired_avg_lum) {
2039                         if (gain > gain_knee)
2040                                 gain--;
2041                         else if (exposure > exposure_knee)
2042                                 exposure--;
2043                         else if (gain > gain_ctrl->qctrl.default_value)
2044                                 gain--;
2045                         else if (exposure > exposure_ctrl->qctrl.minimum)
2046                                 exposure--;
2047                         else if (gain > gain_ctrl->qctrl.minimum)
2048                                 gain--;
2049                         else
2050                                 break;
2051                 } else {
2052                         if (gain < gain_ctrl->qctrl.default_value)
2053                                 gain++;
2054                         else if (exposure < exposure_knee)
2055                                 exposure++;
2056                         else if (gain < gain_knee)
2057                                 gain++;
2058                         else if (exposure < exposure_ctrl->qctrl.maximum)
2059                                 exposure++;
2060                         else if (gain < gain_ctrl->qctrl.maximum)
2061                                 gain++;
2062                         else
2063                                 break;
2064                 }
2065         }
2066
2067         if (gain != orig_gain) {
2068                 gain_ctrl->set(gspca_dev, gain);
2069                 retval = 1;
2070         }
2071         if (exposure != orig_exposure) {
2072                 exposure_ctrl->set(gspca_dev, exposure);
2073                 retval = 1;
2074         }
2075
2076         return retval;
2077 }
2078 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2079
2080 /* -- module insert / remove -- */
2081 static int __init gspca_init(void)
2082 {
2083         info("main v%d.%d.%d registered",
2084                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2085                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2086                 DRIVER_VERSION_NUMBER & 0xff);
2087         return 0;
2088 }
2089 static void __exit gspca_exit(void)
2090 {
2091         info("main deregistered");
2092 }
2093
2094 module_init(gspca_init);
2095 module_exit(gspca_exit);
2096
2097 #ifdef GSPCA_DEBUG
2098 module_param_named(debug, gspca_debug, int, 0644);
2099 MODULE_PARM_DESC(debug,
2100                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2101                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2102                 " 0x0100: v4l2");
2103 #endif