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 2             /* default number of URBs */
  42
  43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  45 MODULE_LICENSE("GPL");
  46
  47 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 5, 0)
  48
  49 static int video_nr = -1;
  50
  51 #ifdef GSPCA_DEBUG
  52 int gspca_debug = D_ERR | D_PROBE;
  53 EXPORT_SYMBOL(gspca_debug);
  54
  55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  56 {
  57         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  58                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  59                         txt,
  60                         pixfmt & 0xff,
  61                         (pixfmt >> 8) & 0xff,
  62                         (pixfmt >> 16) & 0xff,
  63                         pixfmt >> 24,
  64                         w, h);
  65         } else {
  66                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  67                         txt,
  68                         pixfmt,
  69                         w, h);
  70         }
  71 }
  72 #else
  73 #define PDEBUG_MODE(txt, pixfmt, w, h)
  74 #endif
  75
  76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  77 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  78 #define GSPCA_MEMORY_READ 7
  79
  80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  81
  82 /*
  83  * VMA operations.
  84  */
  85 static void gspca_vm_open(struct vm_area_struct *vma)
  86 {
  87         struct gspca_frame *frame = vma->vm_private_data;
  88
  89         frame->vma_use_count++;
  90         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  91 }
  92
  93 static void gspca_vm_close(struct vm_area_struct *vma)
  94 {
  95         struct gspca_frame *frame = vma->vm_private_data;
  96
  97         if (--frame->vma_use_count <= 0)
  98                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  99 }
 100
 101 static struct vm_operations_struct gspca_vm_ops = {
 102         .open           = gspca_vm_open,
 103         .close          = gspca_vm_close,
 104 };
 105
 106 /* get the current input frame buffer */
 107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 108 {
 109         struct gspca_frame *frame;
 110         int i;
 111
 112         i = gspca_dev->fr_i;
 113         i = gspca_dev->fr_queue[i];
 114         frame = &gspca_dev->frame[i];
 115         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 116                                 != V4L2_BUF_FLAG_QUEUED)
 117                 return NULL;
 118         return frame;
 119 }
 120 EXPORT_SYMBOL(gspca_get_i_frame);
 121
 122 /*
 123  * fill a video frame from an URB and resubmit
 124  */
 125 static void fill_frame(struct gspca_dev *gspca_dev,
 126                         struct urb *urb)
 127 {
 128         struct gspca_frame *frame;
 129         __u8 *data;             /* address of data in the iso message */
 130         int i, len, st;
 131         cam_pkt_op pkt_scan;
 132
 133         if (urb->status != 0) {
 134 #ifdef CONFIG_PM
 135                 if (!gspca_dev->frozen)
 136 #endif
 137                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 138                 return;         /* disconnection ? */
 139         }
 140         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 141         for (i = 0; i < urb->number_of_packets; i++) {
 142
 143                 /* check the availability of the frame buffer */
 144                 frame = gspca_get_i_frame(gspca_dev);
 145                 if (!frame) {
 146                         gspca_dev->last_packet_type = DISCARD_PACKET;
 147                         break;
 148                 }
 149
 150                 /* check the packet status and length */
 151                 len = urb->iso_frame_desc[i].actual_length;
 152                 if (len == 0) {
 153                         if (gspca_dev->empty_packet == 0)
 154                                 gspca_dev->empty_packet = 1;
 155                         continue;
 156                 }
 157                 st = urb->iso_frame_desc[i].status;
 158                 if (st) {
 159                         PDEBUG(D_ERR,
 160                                 "ISOC data error: [%d] len=%d, status=%d",
 161                                 i, len, st);
 162                         gspca_dev->last_packet_type = DISCARD_PACKET;
 163                         continue;
 164                 }
 165
 166                 /* let the packet be analyzed by the subdriver */
 167                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 168                         i, urb->iso_frame_desc[i].offset, len);
 169                 data = (__u8 *) urb->transfer_buffer
 170                                         + urb->iso_frame_desc[i].offset;
 171                 pkt_scan(gspca_dev, frame, data, len);
 172         }
 173
 174         /* resubmit the URB */
 175         st = usb_submit_urb(urb, GFP_ATOMIC);
 176         if (st < 0)
 177                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 178 }
 179
 180 /*
 181  * ISOC message interrupt from the USB device
 182  *
 183  * Analyse each packet and call the subdriver for copy to the frame buffer.
 184  */
 185 static void isoc_irq(struct urb *urb
 186 )
 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 {
 202         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 203         struct gspca_frame *frame;
 204         int st;
 205
 206         PDEBUG(D_PACK, "bulk irq");
 207         if (!gspca_dev->streaming)
 208                 return;
 209         switch (urb->status) {
 210         case 0:
 211                 break;
 212         case -ECONNRESET:
 213                 urb->status = 0;
 214                 break;
 215         default:
 216 #ifdef CONFIG_PM
 217                 if (!gspca_dev->frozen)
 218 #endif
 219                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 220                 return;         /* disconnection ? */
 221         }
 222
 223         /* check the availability of the frame buffer */
 224         frame = gspca_get_i_frame(gspca_dev);
 225         if (!frame) {
 226                 gspca_dev->last_packet_type = DISCARD_PACKET;
 227         } else {
 228                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 229                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 230                                         frame,
 231                                         urb->transfer_buffer,
 232                                         urb->actual_length);
 233         }
 234
 235         /* resubmit the URB */
 236         if (gspca_dev->cam.bulk_nurbs != 0) {
 237                 st = usb_submit_urb(urb, GFP_ATOMIC);
 238                 if (st < 0)
 239                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 240         }
 241 }
 242
 243 /*
 244  * add data to the current frame
 245  *
 246  * This function is called by the subdrivers at interrupt level.
 247  *
 248  * To build a frame, these ones must add
 249  *      - one FIRST_PACKET
 250  *      - 0 or many INTER_PACKETs
 251  *      - one LAST_PACKET
 252  * DISCARD_PACKET invalidates the whole frame.
 253  * On LAST_PACKET, a new frame is returned.
 254  */
 255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 256                                     enum gspca_packet_type packet_type,
 257                                     struct gspca_frame *frame,
 258                                     const __u8 *data,
 259                                     int len)
 260 {
 261         int i, j;
 262
 263         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 264
 265         /* when start of a new frame, if the current frame buffer
 266          * is not queued, discard the whole frame */
 267         if (packet_type == FIRST_PACKET) {
 268                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 269                                                 != V4L2_BUF_FLAG_QUEUED) {
 270                         gspca_dev->last_packet_type = DISCARD_PACKET;
 271                         return frame;
 272                 }
 273                 frame->data_end = frame->data;
 274                 jiffies_to_timeval(get_jiffies_64(),
 275                                    &frame->v4l2_buf.timestamp);
 276                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 277         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 278                 if (packet_type == LAST_PACKET)
 279                         gspca_dev->last_packet_type = packet_type;
 280                 return frame;
 281         }
 282
 283         /* append the packet to the frame buffer */
 284         if (len > 0) {
 285                 if (frame->data_end - frame->data + len
 286                                                  > frame->v4l2_buf.length) {
 287                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 288                                 frame->data_end - frame->data + len,
 289                                 frame->v4l2_buf.length);
 290                         packet_type = DISCARD_PACKET;
 291                 } else {
 292                         memcpy(frame->data_end, data, len);
 293                         frame->data_end += len;
 294                 }
 295         }
 296         gspca_dev->last_packet_type = packet_type;
 297
 298         /* if last packet, wake up the application and advance in the queue */
 299         if (packet_type == LAST_PACKET) {
 300                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 301                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 302                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 303                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 304                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 305                 gspca_dev->fr_i = i;
 306                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 307                         frame->v4l2_buf.bytesused,
 308                         gspca_dev->fr_q,
 309                         i,
 310                         gspca_dev->fr_o);
 311                 j = gspca_dev->fr_queue[i];
 312                 frame = &gspca_dev->frame[j];
 313         }
 314         return frame;
 315 }
 316 EXPORT_SYMBOL(gspca_frame_add);
 317
 318 static int gspca_is_compressed(__u32 format)
 319 {
 320         switch (format) {
 321         case V4L2_PIX_FMT_MJPEG:
 322         case V4L2_PIX_FMT_JPEG:
 323         case V4L2_PIX_FMT_SPCA561:
 324         case V4L2_PIX_FMT_PAC207:
 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         gspca_set_alt0(gspca_dev);
 670         if (gspca_dev->sd_desc->stop0)
 671                 gspca_dev->sd_desc->stop0(gspca_dev);
 672         PDEBUG(D_STREAM, "stream off OK");
 673 }
 674
 675 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 676 {
 677         int i;
 678
 679         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 680         gspca_dev->curr_mode = i;
 681         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 682         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 683         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 684 }
 685
 686 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 687                         int width, int height)
 688 {
 689         int i;
 690
 691         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 692                 if (width >= gspca_dev->cam.cam_mode[i].width
 693                     && height >= gspca_dev->cam.cam_mode[i].height)
 694                         break;
 695         }
 696         return i;
 697 }
 698
 699 /*
 700  * search a mode with the right pixel format
 701  */
 702 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 703                         int mode,
 704                         int pixfmt)
 705 {
 706         int modeU, modeD;
 707
 708         modeU = modeD = mode;
 709         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 710                 if (--modeD >= 0) {
 711                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 712                                                                 == pixfmt)
 713                                 return modeD;
 714                 }
 715                 if (++modeU < gspca_dev->cam.nmodes) {
 716                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 717                                                                 == pixfmt)
 718                                 return modeU;
 719                 }
 720         }
 721         return -EINVAL;
 722 }
 723
 724 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 725                                 struct v4l2_fmtdesc *fmtdesc)
 726 {
 727         struct gspca_dev *gspca_dev = priv;
 728         int i, j, index;
 729         __u32 fmt_tb[8];
 730
 731         /* give an index to each format */
 732         index = 0;
 733         j = 0;
 734         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 735                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 736                 j = 0;
 737                 for (;;) {
 738                         if (fmt_tb[j] == fmt_tb[index])
 739                                 break;
 740                         j++;
 741                 }
 742                 if (j == index) {
 743                         if (fmtdesc->index == index)
 744                                 break;          /* new format */
 745                         index++;
 746                         if (index >= ARRAY_SIZE(fmt_tb))
 747                                 return -EINVAL;
 748                 }
 749         }
 750         if (i < 0)
 751                 return -EINVAL;         /* no more format */
 752
 753         fmtdesc->pixelformat = fmt_tb[index];
 754         if (gspca_is_compressed(fmt_tb[index]))
 755                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 756         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 757         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 758         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 759         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 760         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 761         fmtdesc->description[4] = '\0';
 762         return 0;
 763 }
 764
 765 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 766                             struct v4l2_format *fmt)
 767 {
 768         struct gspca_dev *gspca_dev = priv;
 769         int mode;
 770
 771         mode = gspca_dev->curr_mode;
 772         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 773                 sizeof fmt->fmt.pix);
 774         return 0;
 775 }
 776
 777 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 778                         struct v4l2_format *fmt)
 779 {
 780         int w, h, mode, mode2;
 781
 782         w = fmt->fmt.pix.width;
 783         h = fmt->fmt.pix.height;
 784
 785 #ifdef GSPCA_DEBUG
 786         if (gspca_debug & D_CONF)
 787                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 788 #endif
 789         /* search the closest mode for width and height */
 790         mode = wxh_to_mode(gspca_dev, w, h);
 791
 792         /* OK if right palette */
 793         if (gspca_dev->cam.cam_mode[mode].pixelformat
 794                                                 != fmt->fmt.pix.pixelformat) {
 795
 796                 /* else, search the closest mode with the same pixel format */
 797                 mode2 = gspca_get_mode(gspca_dev, mode,
 798                                         fmt->fmt.pix.pixelformat);
 799                 if (mode2 >= 0)
 800                         mode = mode2;
 801 /*              else
 802                         ;                * no chance, return this mode */
 803         }
 804         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 805                 sizeof fmt->fmt.pix);
 806         return mode;                    /* used when s_fmt */
 807 }
 808
 809 static int vidioc_try_fmt_vid_cap(struct file *file,
 810                               void *priv,
 811                               struct v4l2_format *fmt)
 812 {
 813         struct gspca_dev *gspca_dev = priv;
 814         int ret;
 815
 816         ret = try_fmt_vid_cap(gspca_dev, fmt);
 817         if (ret < 0)
 818                 return ret;
 819         return 0;
 820 }
 821
 822 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 823                             struct v4l2_format *fmt)
 824 {
 825         struct gspca_dev *gspca_dev = priv;
 826         int ret;
 827
 828         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 829                 return -ERESTARTSYS;
 830
 831         ret = try_fmt_vid_cap(gspca_dev, fmt);
 832         if (ret < 0)
 833                 goto out;
 834
 835         if (gspca_dev->nframes != 0
 836             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 837                 ret = -EINVAL;
 838                 goto out;
 839         }
 840
 841         if (ret == gspca_dev->curr_mode) {
 842                 ret = 0;
 843                 goto out;                       /* same mode */
 844         }
 845
 846         if (gspca_dev->streaming) {
 847                 ret = -EBUSY;
 848                 goto out;
 849         }
 850         gspca_dev->width = fmt->fmt.pix.width;
 851         gspca_dev->height = fmt->fmt.pix.height;
 852         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 853         gspca_dev->curr_mode = ret;
 854
 855         ret = 0;
 856 out:
 857         mutex_unlock(&gspca_dev->queue_lock);
 858         return ret;
 859 }
 860
 861 static void gspca_release(struct video_device *vfd)
 862 {
 863         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 864
 865         PDEBUG(D_STREAM, "device released");
 866
 867         kfree(gspca_dev->usb_buf);
 868         kfree(gspca_dev);
 869 }
 870
 871 static int dev_open(struct file *file)
 872 {
 873         struct gspca_dev *gspca_dev;
 874         int ret;
 875
 876         PDEBUG(D_STREAM, "%s open", current->comm);
 877         gspca_dev = (struct gspca_dev *) video_devdata(file);
 878         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 879                 return -ERESTARTSYS;
 880         if (!gspca_dev->present) {
 881                 ret = -ENODEV;
 882                 goto out;
 883         }
 884
 885         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 886                 ret = -EBUSY;
 887                 goto out;
 888         }
 889
 890         /* protect the subdriver against rmmod */
 891         if (!try_module_get(gspca_dev->module)) {
 892                 ret = -ENODEV;
 893                 goto out;
 894         }
 895
 896         gspca_dev->users++;
 897
 898         file->private_data = gspca_dev;
 899 #ifdef GSPCA_DEBUG
 900         /* activate the v4l2 debug */
 901         if (gspca_debug & D_V4L2)
 902                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 903                                         | V4L2_DEBUG_IOCTL_ARG;
 904         else
 905                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 906                                         | V4L2_DEBUG_IOCTL_ARG);
 907 #endif
 908         ret = 0;
 909 out:
 910         mutex_unlock(&gspca_dev->queue_lock);
 911         if (ret != 0)
 912                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 913         else
 914                 PDEBUG(D_STREAM, "open done");
 915         return ret;
 916 }
 917
 918 static int dev_close(struct file *file)
 919 {
 920         struct gspca_dev *gspca_dev = file->private_data;
 921
 922         PDEBUG(D_STREAM, "%s close", current->comm);
 923         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 924                 return -ERESTARTSYS;
 925         gspca_dev->users--;
 926
 927         /* if the file did the capture, free the streaming resources */
 928         if (gspca_dev->capt_file == file) {
 929                 if (gspca_dev->streaming) {
 930                         mutex_lock(&gspca_dev->usb_lock);
 931                         gspca_stream_off(gspca_dev);
 932                         mutex_unlock(&gspca_dev->usb_lock);
 933                 }
 934                 frame_free(gspca_dev);
 935                 gspca_dev->capt_file = NULL;
 936                 gspca_dev->memory = GSPCA_MEMORY_NO;
 937         }
 938         file->private_data = NULL;
 939         module_put(gspca_dev->module);
 940         mutex_unlock(&gspca_dev->queue_lock);
 941
 942         PDEBUG(D_STREAM, "close done");
 943
 944         return 0;
 945 }
 946
 947 static int vidioc_querycap(struct file *file, void  *priv,
 948                            struct v4l2_capability *cap)
 949 {
 950         struct gspca_dev *gspca_dev = priv;
 951
 952         memset(cap, 0, sizeof *cap);
 953         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 954         if (gspca_dev->dev->product != NULL) {
 955                 strncpy(cap->card, gspca_dev->dev->product,
 956                         sizeof cap->card);
 957         } else {
 958                 snprintf(cap->card, sizeof cap->card,
 959                         "USB Camera (%04x:%04x)",
 960                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 961                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 962         }
 963         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 964                 sizeof cap->bus_info);
 965         cap->version = DRIVER_VERSION_NUMBER;
 966         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 967                           | V4L2_CAP_STREAMING
 968                           | V4L2_CAP_READWRITE;
 969         return 0;
 970 }
 971
 972 static int vidioc_queryctrl(struct file *file, void *priv,
 973                            struct v4l2_queryctrl *q_ctrl)
 974 {
 975         struct gspca_dev *gspca_dev = priv;
 976         int i, ix;
 977         u32 id;
 978
 979         ix = -1;
 980         id = q_ctrl->id;
 981         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 982                 id &= V4L2_CTRL_ID_MASK;
 983                 id++;
 984                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 985                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 986                                 continue;
 987                         if (ix < 0) {
 988                                 ix = i;
 989                                 continue;
 990                         }
 991                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 992                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 993                                 continue;
 994                         ix = i;
 995                 }
 996         }
 997         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 998                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 999                         ix = i;
1000                         break;
1001                 }
1002         }
1003         if (ix < 0)
1004                 return -EINVAL;
1005         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1006                 sizeof *q_ctrl);
1007         if (gspca_dev->ctrl_dis & (1 << ix))
1008                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1009         return 0;
1010 }
1011
1012 static int vidioc_s_ctrl(struct file *file, void *priv,
1013                          struct v4l2_control *ctrl)
1014 {
1015         struct gspca_dev *gspca_dev = priv;
1016         const struct ctrl *ctrls;
1017         int i, ret;
1018
1019         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1020              i < gspca_dev->sd_desc->nctrls;
1021              i++, ctrls++) {
1022                 if (ctrl->id != ctrls->qctrl.id)
1023                         continue;
1024                 if (gspca_dev->ctrl_dis & (1 << i))
1025                         return -EINVAL;
1026                 if (ctrl->value < ctrls->qctrl.minimum
1027                     || ctrl->value > ctrls->qctrl.maximum)
1028                         return -ERANGE;
1029                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1030                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1031                         return -ERESTARTSYS;
1032                 ret = ctrls->set(gspca_dev, ctrl->value);
1033                 mutex_unlock(&gspca_dev->usb_lock);
1034                 return ret;
1035         }
1036         return -EINVAL;
1037 }
1038
1039 static int vidioc_g_ctrl(struct file *file, void *priv,
1040                          struct v4l2_control *ctrl)
1041 {
1042         struct gspca_dev *gspca_dev = priv;
1043
1044         const struct ctrl *ctrls;
1045         int i, ret;
1046
1047         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1048              i < gspca_dev->sd_desc->nctrls;
1049              i++, ctrls++) {
1050                 if (ctrl->id != ctrls->qctrl.id)
1051                         continue;
1052                 if (gspca_dev->ctrl_dis & (1 << i))
1053                         return -EINVAL;
1054                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1055                         return -ERESTARTSYS;
1056                 ret = ctrls->get(gspca_dev, &ctrl->value);
1057                 mutex_unlock(&gspca_dev->usb_lock);
1058                 return ret;
1059         }
1060         return -EINVAL;
1061 }
1062
1063 /*fixme: have an audio flag in gspca_dev?*/
1064 static int vidioc_s_audio(struct file *file, void *priv,
1065                          struct v4l2_audio *audio)
1066 {
1067         if (audio->index != 0)
1068                 return -EINVAL;
1069         return 0;
1070 }
1071
1072 static int vidioc_g_audio(struct file *file, void *priv,
1073                          struct v4l2_audio *audio)
1074 {
1075         memset(audio, 0, sizeof *audio);
1076         strcpy(audio->name, "Microphone");
1077         return 0;
1078 }
1079
1080 static int vidioc_enumaudio(struct file *file, void *priv,
1081                          struct v4l2_audio *audio)
1082 {
1083         if (audio->index != 0)
1084                 return -EINVAL;
1085
1086         strcpy(audio->name, "Microphone");
1087         audio->capability = 0;
1088         audio->mode = 0;
1089         return 0;
1090 }
1091
1092 static int vidioc_querymenu(struct file *file, void *priv,
1093                             struct v4l2_querymenu *qmenu)
1094 {
1095         struct gspca_dev *gspca_dev = priv;
1096
1097         if (!gspca_dev->sd_desc->querymenu)
1098                 return -EINVAL;
1099         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1100 }
1101
1102 static int vidioc_enum_input(struct file *file, void *priv,
1103                                 struct v4l2_input *input)
1104 {
1105         struct gspca_dev *gspca_dev = priv;
1106
1107         if (input->index != 0)
1108                 return -EINVAL;
1109         memset(input, 0, sizeof *input);
1110         input->type = V4L2_INPUT_TYPE_CAMERA;
1111         strncpy(input->name, gspca_dev->sd_desc->name,
1112                 sizeof input->name);
1113         return 0;
1114 }
1115
1116 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1117 {
1118         *i = 0;
1119         return 0;
1120 }
1121
1122 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1123 {
1124         if (i > 0)
1125                 return -EINVAL;
1126         return (0);
1127 }
1128
1129 static int vidioc_reqbufs(struct file *file, void *priv,
1130                           struct v4l2_requestbuffers *rb)
1131 {
1132         struct gspca_dev *gspca_dev = priv;
1133         int i, ret = 0;
1134
1135         switch (rb->memory) {
1136         case GSPCA_MEMORY_READ:                 /* (internal call) */
1137         case V4L2_MEMORY_MMAP:
1138         case V4L2_MEMORY_USERPTR:
1139                 break;
1140         default:
1141                 return -EINVAL;
1142         }
1143         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1144                 return -ERESTARTSYS;
1145
1146         if (gspca_dev->memory != GSPCA_MEMORY_NO
1147             && gspca_dev->memory != rb->memory) {
1148                 ret = -EBUSY;
1149                 goto out;
1150         }
1151
1152         /* only one file may do the capture */
1153         if (gspca_dev->capt_file != NULL
1154             && gspca_dev->capt_file != file) {
1155                 ret = -EBUSY;
1156                 goto out;
1157         }
1158
1159         /* if allocated, the buffers must not be mapped */
1160         for (i = 0; i < gspca_dev->nframes; i++) {
1161                 if (gspca_dev->frame[i].vma_use_count) {
1162                         ret = -EBUSY;
1163                         goto out;
1164                 }
1165         }
1166
1167         /* stop streaming */
1168         if (gspca_dev->streaming) {
1169                 mutex_lock(&gspca_dev->usb_lock);
1170                 gspca_stream_off(gspca_dev);
1171                 mutex_unlock(&gspca_dev->usb_lock);
1172         }
1173
1174         /* free the previous allocated buffers, if any */
1175         if (gspca_dev->nframes != 0) {
1176                 frame_free(gspca_dev);
1177                 gspca_dev->capt_file = NULL;
1178         }
1179         if (rb->count == 0)                     /* unrequest */
1180                 goto out;
1181         gspca_dev->memory = rb->memory;
1182         ret = frame_alloc(gspca_dev, rb->count);
1183         if (ret == 0) {
1184                 rb->count = gspca_dev->nframes;
1185                 gspca_dev->capt_file = file;
1186         }
1187 out:
1188         mutex_unlock(&gspca_dev->queue_lock);
1189         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1190         return ret;
1191 }
1192
1193 static int vidioc_querybuf(struct file *file, void *priv,
1194                            struct v4l2_buffer *v4l2_buf)
1195 {
1196         struct gspca_dev *gspca_dev = priv;
1197         struct gspca_frame *frame;
1198
1199         if (v4l2_buf->index < 0
1200             || v4l2_buf->index >= gspca_dev->nframes)
1201                 return -EINVAL;
1202
1203         frame = &gspca_dev->frame[v4l2_buf->index];
1204         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1205         return 0;
1206 }
1207
1208 static int vidioc_streamon(struct file *file, void *priv,
1209                            enum v4l2_buf_type buf_type)
1210 {
1211         struct gspca_dev *gspca_dev = priv;
1212         int ret;
1213
1214         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1215                 return -EINVAL;
1216         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1217                 return -ERESTARTSYS;
1218         if (!gspca_dev->present) {
1219                 ret = -ENODEV;
1220                 goto out;
1221         }
1222         if (gspca_dev->nframes == 0
1223             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1224                 ret = -EINVAL;
1225                 goto out;
1226         }
1227         if (!gspca_dev->streaming) {
1228                 ret = gspca_init_transfer(gspca_dev);
1229                 if (ret < 0)
1230                         goto out;
1231         }
1232 #ifdef GSPCA_DEBUG
1233         if (gspca_debug & D_STREAM) {
1234                 PDEBUG_MODE("stream on OK",
1235                         gspca_dev->pixfmt,
1236                         gspca_dev->width,
1237                         gspca_dev->height);
1238         }
1239 #endif
1240         ret = 0;
1241 out:
1242         mutex_unlock(&gspca_dev->queue_lock);
1243         return ret;
1244 }
1245
1246 static int vidioc_streamoff(struct file *file, void *priv,
1247                                 enum v4l2_buf_type buf_type)
1248 {
1249         struct gspca_dev *gspca_dev = priv;
1250         int i, ret;
1251
1252         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1253                 return -EINVAL;
1254         if (!gspca_dev->streaming)
1255                 return 0;
1256         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1257                 return -ERESTARTSYS;
1258
1259         /* stop streaming */
1260         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1261                 ret = -ERESTARTSYS;
1262                 goto out;
1263         }
1264         gspca_stream_off(gspca_dev);
1265         mutex_unlock(&gspca_dev->usb_lock);
1266
1267         /* empty the application queues */
1268         for (i = 0; i < gspca_dev->nframes; i++)
1269                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1270         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1271         gspca_dev->last_packet_type = DISCARD_PACKET;
1272         gspca_dev->sequence = 0;
1273         ret = 0;
1274 out:
1275         mutex_unlock(&gspca_dev->queue_lock);
1276         return ret;
1277 }
1278
1279 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1280                         struct v4l2_jpegcompression *jpegcomp)
1281 {
1282         struct gspca_dev *gspca_dev = priv;
1283         int ret;
1284
1285         if (!gspca_dev->sd_desc->get_jcomp)
1286                 return -EINVAL;
1287         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1288                 return -ERESTARTSYS;
1289         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1290         mutex_unlock(&gspca_dev->usb_lock);
1291         return ret;
1292 }
1293
1294 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1295                         struct v4l2_jpegcompression *jpegcomp)
1296 {
1297         struct gspca_dev *gspca_dev = priv;
1298         int ret;
1299
1300         if (!gspca_dev->sd_desc->set_jcomp)
1301                 return -EINVAL;
1302         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1303                 return -ERESTARTSYS;
1304         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1305         mutex_unlock(&gspca_dev->usb_lock);
1306         return ret;
1307 }
1308
1309 static int vidioc_g_parm(struct file *filp, void *priv,
1310                         struct v4l2_streamparm *parm)
1311 {
1312         struct gspca_dev *gspca_dev = priv;
1313
1314         memset(parm, 0, sizeof *parm);
1315         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1316         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1317
1318         if (gspca_dev->sd_desc->get_streamparm) {
1319                 int ret;
1320
1321                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1322                         return -ERESTARTSYS;
1323                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1324                 mutex_unlock(&gspca_dev->usb_lock);
1325                 return ret;
1326         }
1327
1328         return 0;
1329 }
1330
1331 static int vidioc_s_parm(struct file *filp, void *priv,
1332                         struct v4l2_streamparm *parm)
1333 {
1334         struct gspca_dev *gspca_dev = priv;
1335         int n;
1336
1337         n = parm->parm.capture.readbuffers;
1338         if (n == 0 || n > GSPCA_MAX_FRAMES)
1339                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1340         else
1341                 gspca_dev->nbufread = n;
1342
1343         if (gspca_dev->sd_desc->set_streamparm) {
1344                 int ret;
1345
1346                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1347                         return -ERESTARTSYS;
1348                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1349                 mutex_unlock(&gspca_dev->usb_lock);
1350                 return ret;
1351         }
1352
1353         return 0;
1354 }
1355
1356 static int vidioc_s_std(struct file *filp, void *priv,
1357                         v4l2_std_id *parm)
1358 {
1359         return 0;
1360 }
1361
1362 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1363 static int vidiocgmbuf(struct file *file, void *priv,
1364                         struct video_mbuf *mbuf)
1365 {
1366         struct gspca_dev *gspca_dev = file->private_data;
1367         int i;
1368
1369         PDEBUG(D_STREAM, "cgmbuf");
1370         if (gspca_dev->nframes == 0) {
1371                 int ret;
1372
1373                 {
1374                         struct v4l2_format fmt;
1375
1376                         memset(&fmt, 0, sizeof fmt);
1377                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1378                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1379                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1380                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1381                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1382                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1383                         if (ret != 0)
1384                                 return ret;
1385                 }
1386                 {
1387                         struct v4l2_requestbuffers rb;
1388
1389                         memset(&rb, 0, sizeof rb);
1390                         rb.count = 4;
1391                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1392                         rb.memory = V4L2_MEMORY_MMAP;
1393                         ret = vidioc_reqbufs(file, priv, &rb);
1394                         if (ret != 0)
1395                                 return ret;
1396                 }
1397         }
1398         mbuf->frames = gspca_dev->nframes;
1399         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1400         for (i = 0; i < mbuf->frames; i++)
1401                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1402         return 0;
1403 }
1404 #endif
1405
1406 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1407 {
1408         struct gspca_dev *gspca_dev = file->private_data;
1409         struct gspca_frame *frame;
1410         struct page *page;
1411         unsigned long addr, start, size;
1412         int i, ret;
1413
1414         start = vma->vm_start;
1415         size = vma->vm_end - vma->vm_start;
1416         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1417
1418         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1419                 return -ERESTARTSYS;
1420         if (!gspca_dev->present) {
1421                 ret = -ENODEV;
1422                 goto out;
1423         }
1424         if (gspca_dev->capt_file != file) {
1425                 ret = -EINVAL;
1426                 goto out;
1427         }
1428
1429         frame = NULL;
1430         for (i = 0; i < gspca_dev->nframes; ++i) {
1431                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1432                         PDEBUG(D_STREAM, "mmap bad memory type");
1433                         break;
1434                 }
1435                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1436                                                 == vma->vm_pgoff) {
1437                         frame = &gspca_dev->frame[i];
1438                         break;
1439                 }
1440         }
1441         if (frame == NULL) {
1442                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1443                 ret = -EINVAL;
1444                 goto out;
1445         }
1446 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1447         /* v4l1 maps all the buffers */
1448         if (i != 0
1449             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1450 #endif
1451             if (size != frame->v4l2_buf.length) {
1452                 PDEBUG(D_STREAM, "mmap bad size");
1453                 ret = -EINVAL;
1454                 goto out;
1455         }
1456
1457         /*
1458          * - VM_IO marks the area as being a mmaped region for I/O to a
1459          *   device. It also prevents the region from being core dumped.
1460          */
1461         vma->vm_flags |= VM_IO;
1462
1463         addr = (unsigned long) frame->data;
1464         while (size > 0) {
1465                 page = vmalloc_to_page((void *) addr);
1466                 ret = vm_insert_page(vma, start, page);
1467                 if (ret < 0)
1468                         goto out;
1469                 start += PAGE_SIZE;
1470                 addr += PAGE_SIZE;
1471                 size -= PAGE_SIZE;
1472         }
1473
1474         vma->vm_ops = &gspca_vm_ops;
1475         vma->vm_private_data = frame;
1476         gspca_vm_open(vma);
1477         ret = 0;
1478 out:
1479         mutex_unlock(&gspca_dev->queue_lock);
1480         return ret;
1481 }
1482
1483 /*
1484  * wait for a video frame
1485  *
1486  * If a frame is ready, its index is returned.
1487  */
1488 static int frame_wait(struct gspca_dev *gspca_dev,
1489                         int nonblock_ing)
1490 {
1491         struct gspca_frame *frame;
1492         int i, j, ret;
1493
1494         /* check if a frame is ready */
1495         i = gspca_dev->fr_o;
1496         j = gspca_dev->fr_queue[i];
1497         frame = &gspca_dev->frame[j];
1498
1499         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1500                 if (nonblock_ing)
1501                         return -EAGAIN;
1502
1503                 /* wait till a frame is ready */
1504                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1505                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1506                         !gspca_dev->streaming || !gspca_dev->present,
1507                         msecs_to_jiffies(3000));
1508                 if (ret < 0)
1509                         return ret;
1510                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1511                         return -EIO;
1512         }
1513
1514         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1515         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1516                 gspca_dev->fr_q,
1517                 gspca_dev->fr_i,
1518                 gspca_dev->fr_o);
1519
1520         if (gspca_dev->sd_desc->dq_callback) {
1521                 mutex_lock(&gspca_dev->usb_lock);
1522                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1523                 mutex_unlock(&gspca_dev->usb_lock);
1524         }
1525         return j;
1526 }
1527
1528 /*
1529  * dequeue a video buffer
1530  *
1531  * If nonblock_ing is false, block until a buffer is available.
1532  */
1533 static int vidioc_dqbuf(struct file *file, void *priv,
1534                         struct v4l2_buffer *v4l2_buf)
1535 {
1536         struct gspca_dev *gspca_dev = priv;
1537         struct gspca_frame *frame;
1538         int i, ret;
1539
1540         PDEBUG(D_FRAM, "dqbuf");
1541         if (v4l2_buf->memory != gspca_dev->memory)
1542                 return -EINVAL;
1543
1544         /* if not streaming, be sure the application will not loop forever */
1545         if (!(file->f_flags & O_NONBLOCK)
1546             && !gspca_dev->streaming && gspca_dev->users == 1)
1547                 return -EINVAL;
1548
1549         /* only the capturing file may dequeue */
1550         if (gspca_dev->capt_file != file)
1551                 return -EINVAL;
1552
1553         /* only one dequeue / read at a time */
1554         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1555                 return -ERESTARTSYS;
1556
1557         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1558         if (ret < 0)
1559                 goto out;
1560         i = ret;                                /* frame index */
1561         frame = &gspca_dev->frame[i];
1562         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1563                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1564                                  frame->data,
1565                                  frame->v4l2_buf.bytesused)) {
1566                         PDEBUG(D_ERR|D_STREAM,
1567                                 "dqbuf cp to user failed");
1568                         ret = -EFAULT;
1569                         goto out;
1570                 }
1571         }
1572         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1573         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1574         PDEBUG(D_FRAM, "dqbuf %d", i);
1575         ret = 0;
1576 out:
1577         mutex_unlock(&gspca_dev->read_lock);
1578         return ret;
1579 }
1580
1581 /*
1582  * queue a video buffer
1583  *
1584  * Attempting to queue a buffer that has already been
1585  * queued will return -EINVAL.
1586  */
1587 static int vidioc_qbuf(struct file *file, void *priv,
1588                         struct v4l2_buffer *v4l2_buf)
1589 {
1590         struct gspca_dev *gspca_dev = priv;
1591         struct gspca_frame *frame;
1592         int i, index, ret;
1593
1594         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1595
1596         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1597                 return -ERESTARTSYS;
1598
1599         index = v4l2_buf->index;
1600         if ((unsigned) index >= gspca_dev->nframes) {
1601                 PDEBUG(D_FRAM,
1602                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1603                 ret = -EINVAL;
1604                 goto out;
1605         }
1606         if (v4l2_buf->memory != gspca_dev->memory) {
1607                 PDEBUG(D_FRAM, "qbuf bad memory type");
1608                 ret = -EINVAL;
1609                 goto out;
1610         }
1611
1612         frame = &gspca_dev->frame[index];
1613         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1614                 PDEBUG(D_FRAM, "qbuf bad state");
1615                 ret = -EINVAL;
1616                 goto out;
1617         }
1618
1619         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1620
1621         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1622                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1623                 frame->v4l2_buf.length = v4l2_buf->length;
1624         }
1625
1626         /* put the buffer in the 'queued' queue */
1627         i = gspca_dev->fr_q;
1628         gspca_dev->fr_queue[i] = index;
1629         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1630         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1631                 gspca_dev->fr_q,
1632                 gspca_dev->fr_i,
1633                 gspca_dev->fr_o);
1634
1635         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1636         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1637         ret = 0;
1638 out:
1639         mutex_unlock(&gspca_dev->queue_lock);
1640         return ret;
1641 }
1642
1643 /*
1644  * allocate the resources for read()
1645  */
1646 static int read_alloc(struct gspca_dev *gspca_dev,
1647                         struct file *file)
1648 {
1649         struct v4l2_buffer v4l2_buf;
1650         int i, ret;
1651
1652         PDEBUG(D_STREAM, "read alloc");
1653         if (gspca_dev->nframes == 0) {
1654                 struct v4l2_requestbuffers rb;
1655
1656                 memset(&rb, 0, sizeof rb);
1657                 rb.count = gspca_dev->nbufread;
1658                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1659                 rb.memory = GSPCA_MEMORY_READ;
1660                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1661                 if (ret != 0) {
1662                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1663                         return ret;
1664                 }
1665                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1666                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1667                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1668                 for (i = 0; i < gspca_dev->nbufread; i++) {
1669                         v4l2_buf.index = i;
1670                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1671                         if (ret != 0) {
1672                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1673                                 return ret;
1674                         }
1675                 }
1676                 gspca_dev->memory = GSPCA_MEMORY_READ;
1677         }
1678
1679         /* start streaming */
1680         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1681         if (ret != 0)
1682                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1683         return ret;
1684 }
1685
1686 static unsigned int dev_poll(struct file *file, poll_table *wait)
1687 {
1688         struct gspca_dev *gspca_dev = file->private_data;
1689         int i, ret;
1690
1691         PDEBUG(D_FRAM, "poll");
1692
1693         poll_wait(file, &gspca_dev->wq, wait);
1694         if (!gspca_dev->present)
1695                 return POLLERR;
1696
1697         /* if reqbufs is not done, the user would use read() */
1698         if (gspca_dev->nframes == 0) {
1699                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1700                         return POLLERR;         /* not the 1st time */
1701                 ret = read_alloc(gspca_dev, file);
1702                 if (ret != 0)
1703                         return POLLERR;
1704         }
1705
1706         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1707                 return POLLERR;
1708         if (!gspca_dev->present) {
1709                 ret = POLLERR;
1710                 goto out;
1711         }
1712
1713         /* check the next incoming buffer */
1714         i = gspca_dev->fr_o;
1715         i = gspca_dev->fr_queue[i];
1716         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1717                 ret = POLLIN | POLLRDNORM;      /* something to read */
1718         else
1719                 ret = 0;
1720 out:
1721         mutex_unlock(&gspca_dev->queue_lock);
1722         return ret;
1723 }
1724
1725 static ssize_t dev_read(struct file *file, char __user *data,
1726                     size_t count, loff_t *ppos)
1727 {
1728         struct gspca_dev *gspca_dev = file->private_data;
1729         struct gspca_frame *frame;
1730         struct v4l2_buffer v4l2_buf;
1731         struct timeval timestamp;
1732         int n, ret, ret2;
1733
1734         PDEBUG(D_FRAM, "read (%zd)", count);
1735         if (!gspca_dev->present)
1736                 return -ENODEV;
1737         switch (gspca_dev->memory) {
1738         case GSPCA_MEMORY_NO:                   /* first time */
1739                 ret = read_alloc(gspca_dev, file);
1740                 if (ret != 0)
1741                         return ret;
1742                 break;
1743         case GSPCA_MEMORY_READ:
1744                 if (gspca_dev->capt_file == file)
1745                         break;
1746                 /* fall thru */
1747         default:
1748                 return -EINVAL;
1749         }
1750
1751         /* get a frame */
1752         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1753         timestamp.tv_sec--;
1754         n = 2;
1755         for (;;) {
1756                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1757                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1758                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1759                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1760                 if (ret != 0) {
1761                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1762                         return ret;
1763                 }
1764
1765                 /* if the process slept for more than 1 second,
1766                  * get a newer frame */
1767                 frame = &gspca_dev->frame[v4l2_buf.index];
1768                 if (--n < 0)
1769                         break;                  /* avoid infinite loop */
1770                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1771                         break;
1772                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1773                 if (ret != 0) {
1774                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1775                         return ret;
1776                 }
1777         }
1778
1779         /* copy the frame */
1780         if (count > frame->v4l2_buf.bytesused)
1781                 count = frame->v4l2_buf.bytesused;
1782         ret = copy_to_user(data, frame->data, count);
1783         if (ret != 0) {
1784                 PDEBUG(D_ERR|D_STREAM,
1785                         "read cp to user lack %d / %zd", ret, count);
1786                 ret = -EFAULT;
1787                 goto out;
1788         }
1789         ret = count;
1790 out:
1791         /* in each case, requeue the buffer */
1792         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1793         if (ret2 != 0)
1794                 return ret2;
1795         return ret;
1796 }
1797
1798 static struct v4l2_file_operations dev_fops = {
1799         .owner = THIS_MODULE,
1800         .open = dev_open,
1801         .release = dev_close,
1802         .read = dev_read,
1803         .mmap = dev_mmap,
1804         .unlocked_ioctl = video_ioctl2,
1805         .poll   = dev_poll,
1806 };
1807
1808 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1809         .vidioc_querycap        = vidioc_querycap,
1810         .vidioc_dqbuf           = vidioc_dqbuf,
1811         .vidioc_qbuf            = vidioc_qbuf,
1812         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1813         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1814         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1815         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1816         .vidioc_streamon        = vidioc_streamon,
1817         .vidioc_queryctrl       = vidioc_queryctrl,
1818         .vidioc_g_ctrl          = vidioc_g_ctrl,
1819         .vidioc_s_ctrl          = vidioc_s_ctrl,
1820         .vidioc_g_audio         = vidioc_g_audio,
1821         .vidioc_s_audio         = vidioc_s_audio,
1822         .vidioc_enumaudio       = vidioc_enumaudio,
1823         .vidioc_querymenu       = vidioc_querymenu,
1824         .vidioc_enum_input      = vidioc_enum_input,
1825         .vidioc_g_input         = vidioc_g_input,
1826         .vidioc_s_input         = vidioc_s_input,
1827         .vidioc_reqbufs         = vidioc_reqbufs,
1828         .vidioc_querybuf        = vidioc_querybuf,
1829         .vidioc_streamoff       = vidioc_streamoff,
1830         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1831         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1832         .vidioc_g_parm          = vidioc_g_parm,
1833         .vidioc_s_parm          = vidioc_s_parm,
1834         .vidioc_s_std           = vidioc_s_std,
1835 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1836         .vidiocgmbuf          = vidiocgmbuf,
1837 #endif
1838 };
1839
1840 static struct video_device gspca_template = {
1841         .name = "gspca main driver",
1842         .fops = &dev_fops,
1843         .ioctl_ops = &dev_ioctl_ops,
1844         .release = gspca_release,
1845         .minor = -1,
1846 };
1847
1848 /*
1849  * probe and create a new gspca device
1850  *
1851  * This function must be called by the sub-driver when it is
1852  * called for probing a new device.
1853  */
1854 int gspca_dev_probe(struct usb_interface *intf,
1855                 const struct usb_device_id *id,
1856                 const struct sd_desc *sd_desc,
1857                 int dev_size,
1858                 struct module *module)
1859 {
1860         struct usb_interface_descriptor *interface;
1861         struct gspca_dev *gspca_dev;
1862         struct usb_device *dev = interface_to_usbdev(intf);
1863         int ret;
1864
1865         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1866
1867         /* we don't handle multi-config cameras */
1868         if (dev->descriptor.bNumConfigurations != 1)
1869                 return -ENODEV;
1870         interface = &intf->cur_altsetting->desc;
1871         if (interface->bInterfaceNumber > 0)
1872                 return -ENODEV;
1873
1874         /* create the device */
1875         if (dev_size < sizeof *gspca_dev)
1876                 dev_size = sizeof *gspca_dev;
1877         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1878         if (!gspca_dev) {
1879                 err("couldn't kzalloc gspca struct");
1880                 return -ENOMEM;
1881         }
1882         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1883         if (!gspca_dev->usb_buf) {
1884                 err("out of memory");
1885                 ret = -ENOMEM;
1886                 goto out;
1887         }
1888         gspca_dev->dev = dev;
1889         gspca_dev->iface = interface->bInterfaceNumber;
1890         gspca_dev->nbalt = intf->num_altsetting;
1891         gspca_dev->sd_desc = sd_desc;
1892         gspca_dev->nbufread = 2;
1893         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1894
1895         /* configure the subdriver and initialize the USB device */
1896         ret = sd_desc->config(gspca_dev, id);
1897         if (ret < 0)
1898                 goto out;
1899         ret = sd_desc->init(gspca_dev);
1900         if (ret < 0)
1901                 goto out;
1902         ret = gspca_set_alt0(gspca_dev);
1903         if (ret < 0)
1904                 goto out;
1905         gspca_set_default_mode(gspca_dev);
1906
1907         mutex_init(&gspca_dev->usb_lock);
1908         mutex_init(&gspca_dev->read_lock);
1909         mutex_init(&gspca_dev->queue_lock);
1910         init_waitqueue_head(&gspca_dev->wq);
1911
1912         /* init video stuff */
1913         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1914         gspca_dev->vdev.parent = &dev->dev;
1915         gspca_dev->module = module;
1916         gspca_dev->present = 1;
1917         ret = video_register_device(&gspca_dev->vdev,
1918                                   VFL_TYPE_GRABBER,
1919                                   video_nr);
1920         if (ret < 0) {
1921                 err("video_register_device err %d", ret);
1922                 goto out;
1923         }
1924
1925         usb_set_intfdata(intf, gspca_dev);
1926         PDEBUG(D_PROBE, "probe ok");
1927         return 0;
1928 out:
1929         kfree(gspca_dev->usb_buf);
1930         kfree(gspca_dev);
1931         return ret;
1932 }
1933 EXPORT_SYMBOL(gspca_dev_probe);
1934
1935 /*
1936  * USB disconnection
1937  *
1938  * This function must be called by the sub-driver
1939  * when the device disconnects, after the specific resources are freed.
1940  */
1941 void gspca_disconnect(struct usb_interface *intf)
1942 {
1943         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1944
1945         mutex_lock(&gspca_dev->usb_lock);
1946         gspca_dev->present = 0;
1947         mutex_unlock(&gspca_dev->usb_lock);
1948
1949         destroy_urbs(gspca_dev);
1950         gspca_dev->dev = NULL;
1951         usb_set_intfdata(intf, NULL);
1952
1953         /* release the device */
1954         /* (this will call gspca_release() immediatly or on last close) */
1955         video_unregister_device(&gspca_dev->vdev);
1956
1957         PDEBUG(D_PROBE, "disconnect complete");
1958 }
1959 EXPORT_SYMBOL(gspca_disconnect);
1960
1961 #ifdef CONFIG_PM
1962 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1963 {
1964         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1965
1966         if (!gspca_dev->streaming)
1967                 return 0;
1968         gspca_dev->frozen = 1;          /* avoid urb error messages */
1969         if (gspca_dev->sd_desc->stopN)
1970                 gspca_dev->sd_desc->stopN(gspca_dev);
1971         destroy_urbs(gspca_dev);
1972         gspca_set_alt0(gspca_dev);
1973         if (gspca_dev->sd_desc->stop0)
1974                 gspca_dev->sd_desc->stop0(gspca_dev);
1975         return 0;
1976 }
1977 EXPORT_SYMBOL(gspca_suspend);
1978
1979 int gspca_resume(struct usb_interface *intf)
1980 {
1981         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1982
1983         gspca_dev->frozen = 0;
1984         gspca_dev->sd_desc->init(gspca_dev);
1985         if (gspca_dev->streaming)
1986                 return gspca_init_transfer(gspca_dev);
1987         return 0;
1988 }
1989 EXPORT_SYMBOL(gspca_resume);
1990 #endif
1991 /* -- cam driver utility functions -- */
1992
1993 /* auto gain and exposure algorithm based on the knee algorithm described here:
1994    http://ytse.tricolour.net/docs/LowLightOptimization.html
1995
1996    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1997    where changed. */
1998 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1999         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2000 {
2001         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2002         const struct ctrl *gain_ctrl = NULL;
2003         const struct ctrl *exposure_ctrl = NULL;
2004         const struct ctrl *autogain_ctrl = NULL;
2005         int retval = 0;
2006
2007         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2008                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2009                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2010                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2011                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2012                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2013                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014         }
2015         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2016                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2017                         "on cam without (auto)gain/exposure");
2018                 return 0;
2019         }
2020
2021         if (gain_ctrl->get(gspca_dev, &gain) ||
2022                         exposure_ctrl->get(gspca_dev, &exposure) ||
2023                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2024                 return 0;
2025
2026         orig_gain = gain;
2027         orig_exposure = exposure;
2028
2029         /* If we are of a multiple of deadzone, do multiple steps to reach the
2030            desired lumination fast (with the risc of a slight overshoot) */
2031         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2032
2033         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2034                 avg_lum, desired_avg_lum, steps);
2035
2036         for (i = 0; i < steps; i++) {
2037                 if (avg_lum > desired_avg_lum) {
2038                         if (gain > gain_knee)
2039                                 gain--;
2040                         else if (exposure > exposure_knee)
2041                                 exposure--;
2042                         else if (gain > gain_ctrl->qctrl.default_value)
2043                                 gain--;
2044                         else if (exposure > exposure_ctrl->qctrl.minimum)
2045                                 exposure--;
2046                         else if (gain > gain_ctrl->qctrl.minimum)
2047                                 gain--;
2048                         else
2049                                 break;
2050                 } else {
2051                         if (gain < gain_ctrl->qctrl.default_value)
2052                                 gain++;
2053                         else if (exposure < exposure_knee)
2054                                 exposure++;
2055                         else if (gain < gain_knee)
2056                                 gain++;
2057                         else if (exposure < exposure_ctrl->qctrl.maximum)
2058                                 exposure++;
2059                         else if (gain < gain_ctrl->qctrl.maximum)
2060                                 gain++;
2061                         else
2062                                 break;
2063                 }
2064         }
2065
2066         if (gain != orig_gain) {
2067                 gain_ctrl->set(gspca_dev, gain);
2068                 retval = 1;
2069         }
2070         if (exposure != orig_exposure) {
2071                 exposure_ctrl->set(gspca_dev, exposure);
2072                 retval = 1;
2073         }
2074
2075         return retval;
2076 }
2077 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2078
2079 /* -- module insert / remove -- */
2080 static int __init gspca_init(void)
2081 {
2082         info("main v%d.%d.%d registered",
2083                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2084                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2085                 DRIVER_VERSION_NUMBER & 0xff);
2086         return 0;
2087 }
2088 static void __exit gspca_exit(void)
2089 {
2090         info("main deregistered");
2091 }
2092
2093 module_init(gspca_init);
2094 module_exit(gspca_exit);
2095
2096 #ifdef GSPCA_DEBUG
2097 module_param_named(debug, gspca_debug, int, 0644);
2098 MODULE_PARM_DESC(debug,
2099                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2100                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2101                 " 0x0100: v4l2");
2102 #endif