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 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, 4, 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                 gspca_dev->urb[i] = NULL;
 426                 usb_kill_urb(urb);
 427                 if (urb->transfer_buffer != NULL)
 428                         usb_buffer_free(gspca_dev->dev,
 429                                         urb->transfer_buffer_length,
 430                                         urb->transfer_buffer,
 431                                         urb->transfer_dma);
 432                 usb_free_urb(urb);
 433         }
 434 }
 435
 436 /*
 437  * look for an input transfer endpoint in an alternate setting
 438  */
 439 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 440                                           __u8 epaddr,
 441                                           __u8 xfer)
 442 {
 443         struct usb_host_endpoint *ep;
 444         int i, attr;
 445
 446         epaddr |= USB_DIR_IN;
 447         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 448                 ep = &alt->endpoint[i];
 449                 if (ep->desc.bEndpointAddress == epaddr) {
 450                         attr = ep->desc.bmAttributes
 451                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 452                         if (attr == xfer)
 453                                 return ep;
 454                         break;
 455                 }
 456         }
 457         return NULL;
 458 }
 459
 460 /*
 461  * look for an input (isoc or bulk) endpoint
 462  *
 463  * The endpoint is defined by the subdriver.
 464  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 465  * This routine may be called many times when the bandwidth is too small
 466  * (the bandwidth is checked on urb submit).
 467  */
 468 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 469 {
 470         struct usb_interface *intf;
 471         struct usb_host_endpoint *ep;
 472         int i, ret;
 473
 474         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 475         ep = NULL;
 476         i = gspca_dev->alt;                     /* previous alt setting */
 477
 478         /* try isoc */
 479         while (--i > 0) {                       /* alt 0 is unusable */
 480                 ep = alt_xfer(&intf->altsetting[i],
 481                                 gspca_dev->cam.epaddr,
 482                                 USB_ENDPOINT_XFER_ISOC);
 483                 if (ep)
 484                         break;
 485         }
 486
 487         /* if no isoc, try bulk */
 488         if (ep == NULL) {
 489                 ep = alt_xfer(&intf->altsetting[0],
 490                                 gspca_dev->cam.epaddr,
 491                                 USB_ENDPOINT_XFER_BULK);
 492                 if (ep == NULL) {
 493                         err("no transfer endpoint found");
 494                         return NULL;
 495                 }
 496         }
 497         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 498                         i, ep->desc.bEndpointAddress);
 499         if (i > 0) {
 500                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 501                 if (ret < 0) {
 502                         err("set interface err %d", ret);
 503                         return NULL;
 504                 }
 505         }
 506         gspca_dev->alt = i;             /* memorize the current alt setting */
 507         return ep;
 508 }
 509
 510 /*
 511  * create the URBs for image transfer
 512  */
 513 static int create_urbs(struct gspca_dev *gspca_dev,
 514                         struct usb_host_endpoint *ep)
 515 {
 516         struct urb *urb;
 517         int n, nurbs, i, psize, npkt, bsize;
 518
 519         /* calculate the packet size and the number of packets */
 520         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 521
 522         if (gspca_dev->alt != 0) {              /* isoc */
 523
 524                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 525                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 526                 npkt = ISO_MAX_SIZE / psize;
 527                 if (npkt > ISO_MAX_PKT)
 528                         npkt = ISO_MAX_PKT;
 529                 bsize = psize * npkt;
 530                 PDEBUG(D_STREAM,
 531                         "isoc %d pkts size %d = bsize:%d",
 532                         npkt, psize, bsize);
 533                 nurbs = DEF_NURBS;
 534         } else {                                /* bulk */
 535                 npkt = 0;
 536                 bsize = gspca_dev->cam.bulk_size;
 537                 if (bsize == 0)
 538                         bsize = psize;
 539                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 540                 if (gspca_dev->cam.bulk_nurbs != 0)
 541                         nurbs = gspca_dev->cam.bulk_nurbs;
 542                 else
 543                         nurbs = 1;
 544         }
 545
 546         gspca_dev->nurbs = nurbs;
 547         for (n = 0; n < nurbs; n++) {
 548                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 549                 if (!urb) {
 550                         err("usb_alloc_urb failed");
 551                         destroy_urbs(gspca_dev);
 552                         return -ENOMEM;
 553                 }
 554                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 555                                                 bsize,
 556                                                 GFP_KERNEL,
 557                                                 &urb->transfer_dma);
 558
 559                 if (urb->transfer_buffer == NULL) {
 560                         usb_free_urb(urb);
 561                         err("usb_buffer_urb failed");
 562                         destroy_urbs(gspca_dev);
 563                         return -ENOMEM;
 564                 }
 565                 gspca_dev->urb[n] = urb;
 566                 urb->dev = gspca_dev->dev;
 567                 urb->context = gspca_dev;
 568                 urb->transfer_buffer_length = bsize;
 569                 if (npkt != 0) {                /* ISOC */
 570                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 571                                                     ep->desc.bEndpointAddress);
 572                         urb->transfer_flags = URB_ISO_ASAP
 573                                         | URB_NO_TRANSFER_DMA_MAP;
 574                         urb->interval = ep->desc.bInterval;
 575                         urb->complete = isoc_irq;
 576                         urb->number_of_packets = npkt;
 577                         for (i = 0; i < npkt; i++) {
 578                                 urb->iso_frame_desc[i].length = psize;
 579                                 urb->iso_frame_desc[i].offset = psize * i;
 580                         }
 581                 } else {                /* bulk */
 582                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 583                                                 ep->desc.bEndpointAddress),
 584                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 585                         urb->complete = bulk_irq;
 586                 }
 587         }
 588         return 0;
 589 }
 590
 591 /*
 592  * start the USB transfer
 593  */
 594 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 595 {
 596         struct usb_host_endpoint *ep;
 597         int n, ret;
 598
 599         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 600                 return -ERESTARTSYS;
 601
 602         /* set the higher alternate setting and
 603          * loop until urb submit succeeds */
 604         gspca_dev->alt = gspca_dev->nbalt;
 605         for (;;) {
 606                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 607                 ep = get_ep(gspca_dev);
 608                 if (ep == NULL) {
 609                         ret = -EIO;
 610                         goto out;
 611                 }
 612                 ret = create_urbs(gspca_dev, ep);
 613                 if (ret < 0)
 614                         goto out;
 615
 616                 /* clear the bulk endpoint */
 617                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 618                         usb_clear_halt(gspca_dev->dev,
 619                                         usb_rcvintpipe(gspca_dev->dev,
 620                                                  gspca_dev->cam.epaddr));
 621
 622                 /* start the cam */
 623                 ret = gspca_dev->sd_desc->start(gspca_dev);
 624                 if (ret < 0) {
 625                         destroy_urbs(gspca_dev);
 626                         goto out;
 627                 }
 628                 gspca_dev->streaming = 1;
 629
 630                 /* some bulk transfers are started by the subdriver */
 631                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
 632                         break;
 633
 634                 /* submit the URBs */
 635                 for (n = 0; n < gspca_dev->nurbs; n++) {
 636                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 637                         if (ret < 0) {
 638                                 PDEBUG(D_ERR|D_STREAM,
 639                                         "usb_submit_urb [%d] err %d", n, ret);
 640                                 gspca_dev->streaming = 0;
 641                                 destroy_urbs(gspca_dev);
 642                                 if (ret == -ENOSPC) {
 643                                         msleep(20);     /* wait for kill
 644                                                          * complete */
 645                                         break;  /* try the previous alt */
 646                                 }
 647                                 goto out;
 648                         }
 649                 }
 650                 if (ret >= 0)
 651                         break;
 652         }
 653 out:
 654         mutex_unlock(&gspca_dev->usb_lock);
 655         return ret;
 656 }
 657
 658 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 659 {
 660         int ret;
 661
 662         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 663         if (ret < 0)
 664                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 665         return ret;
 666 }
 667
 668 /* Note: both the queue and the usb locks should be held when calling this */
 669 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 670 {
 671         gspca_dev->streaming = 0;
 672         if (gspca_dev->present
 673             && gspca_dev->sd_desc->stopN)
 674                 gspca_dev->sd_desc->stopN(gspca_dev);
 675         destroy_urbs(gspca_dev);
 676         gspca_set_alt0(gspca_dev);
 677         if (gspca_dev->sd_desc->stop0)
 678                 gspca_dev->sd_desc->stop0(gspca_dev);
 679         PDEBUG(D_STREAM, "stream off OK");
 680 }
 681
 682 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 683 {
 684         int i;
 685
 686         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 687         gspca_dev->curr_mode = i;
 688         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 689         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 690         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 691 }
 692
 693 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 694                         int width, int height)
 695 {
 696         int i;
 697
 698         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 699                 if (width >= gspca_dev->cam.cam_mode[i].width
 700                     && height >= gspca_dev->cam.cam_mode[i].height)
 701                         break;
 702         }
 703         return i;
 704 }
 705
 706 /*
 707  * search a mode with the right pixel format
 708  */
 709 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 710                         int mode,
 711                         int pixfmt)
 712 {
 713         int modeU, modeD;
 714
 715         modeU = modeD = mode;
 716         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 717                 if (--modeD >= 0) {
 718                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 719                                                                 == pixfmt)
 720                                 return modeD;
 721                 }
 722                 if (++modeU < gspca_dev->cam.nmodes) {
 723                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 724                                                                 == pixfmt)
 725                                 return modeU;
 726                 }
 727         }
 728         return -EINVAL;
 729 }
 730
 731 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 732                                 struct v4l2_fmtdesc *fmtdesc)
 733 {
 734         struct gspca_dev *gspca_dev = priv;
 735         int i, j, index;
 736         __u32 fmt_tb[8];
 737
 738         /* give an index to each format */
 739         index = 0;
 740         j = 0;
 741         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 742                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 743                 j = 0;
 744                 for (;;) {
 745                         if (fmt_tb[j] == fmt_tb[index])
 746                                 break;
 747                         j++;
 748                 }
 749                 if (j == index) {
 750                         if (fmtdesc->index == index)
 751                                 break;          /* new format */
 752                         index++;
 753                         if (index >= ARRAY_SIZE(fmt_tb))
 754                                 return -EINVAL;
 755                 }
 756         }
 757         if (i < 0)
 758                 return -EINVAL;         /* no more format */
 759
 760         fmtdesc->pixelformat = fmt_tb[index];
 761         if (gspca_is_compressed(fmt_tb[index]))
 762                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 763         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 764         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 765         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 766         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 767         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 768         fmtdesc->description[4] = '\0';
 769         return 0;
 770 }
 771
 772 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 773                             struct v4l2_format *fmt)
 774 {
 775         struct gspca_dev *gspca_dev = priv;
 776         int mode;
 777
 778         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 779                 return -EINVAL;
 780         mode = gspca_dev->curr_mode;
 781         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 782                 sizeof fmt->fmt.pix);
 783         return 0;
 784 }
 785
 786 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 787                         struct v4l2_format *fmt)
 788 {
 789         int w, h, mode, mode2;
 790
 791         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 792                 return -EINVAL;
 793         w = fmt->fmt.pix.width;
 794         h = fmt->fmt.pix.height;
 795
 796 #ifdef GSPCA_DEBUG
 797         if (gspca_debug & D_CONF)
 798                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 799 #endif
 800         /* search the closest mode for width and height */
 801         mode = wxh_to_mode(gspca_dev, w, h);
 802
 803         /* OK if right palette */
 804         if (gspca_dev->cam.cam_mode[mode].pixelformat
 805                                                 != fmt->fmt.pix.pixelformat) {
 806
 807                 /* else, search the closest mode with the same pixel format */
 808                 mode2 = gspca_get_mode(gspca_dev, mode,
 809                                         fmt->fmt.pix.pixelformat);
 810                 if (mode2 >= 0)
 811                         mode = mode2;
 812 /*              else
 813                         ;                * no chance, return this mode */
 814         }
 815         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 816                 sizeof fmt->fmt.pix);
 817         return mode;                    /* used when s_fmt */
 818 }
 819
 820 static int vidioc_try_fmt_vid_cap(struct file *file,
 821                               void *priv,
 822                               struct v4l2_format *fmt)
 823 {
 824         struct gspca_dev *gspca_dev = priv;
 825         int ret;
 826
 827         ret = try_fmt_vid_cap(gspca_dev, fmt);
 828         if (ret < 0)
 829                 return ret;
 830         return 0;
 831 }
 832
 833 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 834                             struct v4l2_format *fmt)
 835 {
 836         struct gspca_dev *gspca_dev = priv;
 837         int ret;
 838
 839         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 840                 return -ERESTARTSYS;
 841
 842         ret = try_fmt_vid_cap(gspca_dev, fmt);
 843         if (ret < 0)
 844                 goto out;
 845
 846         if (gspca_dev->nframes != 0
 847             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 848                 ret = -EINVAL;
 849                 goto out;
 850         }
 851
 852         if (ret == gspca_dev->curr_mode) {
 853                 ret = 0;
 854                 goto out;                       /* same mode */
 855         }
 856
 857         if (gspca_dev->streaming) {
 858                 ret = -EBUSY;
 859                 goto out;
 860         }
 861         gspca_dev->width = fmt->fmt.pix.width;
 862         gspca_dev->height = fmt->fmt.pix.height;
 863         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 864         gspca_dev->curr_mode = ret;
 865
 866         ret = 0;
 867 out:
 868         mutex_unlock(&gspca_dev->queue_lock);
 869         return ret;
 870 }
 871
 872 static void gspca_release(struct video_device *vfd)
 873 {
 874         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 875
 876         PDEBUG(D_STREAM, "device released");
 877
 878         kfree(gspca_dev->usb_buf);
 879         kfree(gspca_dev);
 880 }
 881
 882 static int dev_open(struct inode *inode, struct file *file)
 883 {
 884         struct gspca_dev *gspca_dev;
 885         int ret;
 886
 887         PDEBUG(D_STREAM, "%s open", current->comm);
 888         gspca_dev = (struct gspca_dev *) video_devdata(file);
 889         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 890                 return -ERESTARTSYS;
 891         if (!gspca_dev->present) {
 892                 ret = -ENODEV;
 893                 goto out;
 894         }
 895
 896         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 897                 ret = -EBUSY;
 898                 goto out;
 899         }
 900
 901         /* protect the subdriver against rmmod */
 902         if (!try_module_get(gspca_dev->module)) {
 903                 ret = -ENODEV;
 904                 goto out;
 905         }
 906
 907         gspca_dev->users++;
 908
 909         file->private_data = gspca_dev;
 910 #ifdef GSPCA_DEBUG
 911         /* activate the v4l2 debug */
 912         if (gspca_debug & D_V4L2)
 913                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 914                                         | V4L2_DEBUG_IOCTL_ARG;
 915         else
 916                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 917                                         | V4L2_DEBUG_IOCTL_ARG);
 918 #endif
 919         ret = 0;
 920 out:
 921         mutex_unlock(&gspca_dev->queue_lock);
 922         if (ret != 0)
 923                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 924         else
 925                 PDEBUG(D_STREAM, "open done");
 926         return ret;
 927 }
 928
 929 static int dev_close(struct inode *inode, struct file *file)
 930 {
 931         struct gspca_dev *gspca_dev = file->private_data;
 932
 933         PDEBUG(D_STREAM, "%s close", current->comm);
 934         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 935                 return -ERESTARTSYS;
 936         gspca_dev->users--;
 937
 938         /* if the file did the capture, free the streaming resources */
 939         if (gspca_dev->capt_file == file) {
 940                 if (gspca_dev->streaming) {
 941                         mutex_lock(&gspca_dev->usb_lock);
 942                         gspca_stream_off(gspca_dev);
 943                         mutex_unlock(&gspca_dev->usb_lock);
 944                 }
 945                 frame_free(gspca_dev);
 946                 gspca_dev->capt_file = NULL;
 947                 gspca_dev->memory = GSPCA_MEMORY_NO;
 948         }
 949         file->private_data = NULL;
 950         module_put(gspca_dev->module);
 951         mutex_unlock(&gspca_dev->queue_lock);
 952
 953         PDEBUG(D_STREAM, "close done");
 954
 955         return 0;
 956 }
 957
 958 static int vidioc_querycap(struct file *file, void  *priv,
 959                            struct v4l2_capability *cap)
 960 {
 961         struct gspca_dev *gspca_dev = priv;
 962
 963         memset(cap, 0, sizeof *cap);
 964         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 965         if (gspca_dev->dev->product != NULL) {
 966                 strncpy(cap->card, gspca_dev->dev->product,
 967                         sizeof cap->card);
 968         } else {
 969                 snprintf(cap->card, sizeof cap->card,
 970                         "USB Camera (%04x:%04x)",
 971                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 972                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 973         }
 974         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 975                 sizeof cap->bus_info);
 976         cap->version = DRIVER_VERSION_NUMBER;
 977         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 978                           | V4L2_CAP_STREAMING
 979                           | V4L2_CAP_READWRITE;
 980         return 0;
 981 }
 982
 983 static int vidioc_queryctrl(struct file *file, void *priv,
 984                            struct v4l2_queryctrl *q_ctrl)
 985 {
 986         struct gspca_dev *gspca_dev = priv;
 987         int i, ix;
 988         u32 id;
 989
 990         ix = -1;
 991         id = q_ctrl->id;
 992         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 993                 id &= V4L2_CTRL_ID_MASK;
 994                 id++;
 995                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 996                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 997                                 continue;
 998                         if (ix < 0) {
 999                                 ix = i;
1000                                 continue;
1001                         }
1002                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1003                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1004                                 continue;
1005                         ix = i;
1006                 }
1007         }
1008         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1009                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1010                         ix = i;
1011                         break;
1012                 }
1013         }
1014         if (ix < 0)
1015                 return -EINVAL;
1016         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1017                 sizeof *q_ctrl);
1018         if (gspca_dev->ctrl_dis & (1 << ix))
1019                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1020         return 0;
1021 }
1022
1023 static int vidioc_s_ctrl(struct file *file, void *priv,
1024                          struct v4l2_control *ctrl)
1025 {
1026         struct gspca_dev *gspca_dev = priv;
1027         const struct ctrl *ctrls;
1028         int i, ret;
1029
1030         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1031              i < gspca_dev->sd_desc->nctrls;
1032              i++, ctrls++) {
1033                 if (ctrl->id != ctrls->qctrl.id)
1034                         continue;
1035                 if (gspca_dev->ctrl_dis & (1 << i))
1036                         return -EINVAL;
1037                 if (ctrl->value < ctrls->qctrl.minimum
1038                     || ctrl->value > ctrls->qctrl.maximum)
1039                         return -ERANGE;
1040                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1041                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1042                         return -ERESTARTSYS;
1043                 ret = ctrls->set(gspca_dev, ctrl->value);
1044                 mutex_unlock(&gspca_dev->usb_lock);
1045                 return ret;
1046         }
1047         return -EINVAL;
1048 }
1049
1050 static int vidioc_g_ctrl(struct file *file, void *priv,
1051                          struct v4l2_control *ctrl)
1052 {
1053         struct gspca_dev *gspca_dev = priv;
1054
1055         const struct ctrl *ctrls;
1056         int i, ret;
1057
1058         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1059              i < gspca_dev->sd_desc->nctrls;
1060              i++, ctrls++) {
1061                 if (ctrl->id != ctrls->qctrl.id)
1062                         continue;
1063                 if (gspca_dev->ctrl_dis & (1 << i))
1064                         return -EINVAL;
1065                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1066                         return -ERESTARTSYS;
1067                 ret = ctrls->get(gspca_dev, &ctrl->value);
1068                 mutex_unlock(&gspca_dev->usb_lock);
1069                 return ret;
1070         }
1071         return -EINVAL;
1072 }
1073
1074 static int vidioc_querymenu(struct file *file, void *priv,
1075                             struct v4l2_querymenu *qmenu)
1076 {
1077         struct gspca_dev *gspca_dev = priv;
1078
1079         if (!gspca_dev->sd_desc->querymenu)
1080                 return -EINVAL;
1081         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1082 }
1083
1084 static int vidioc_enum_input(struct file *file, void *priv,
1085                                 struct v4l2_input *input)
1086 {
1087         struct gspca_dev *gspca_dev = priv;
1088
1089         if (input->index != 0)
1090                 return -EINVAL;
1091         memset(input, 0, sizeof *input);
1092         input->type = V4L2_INPUT_TYPE_CAMERA;
1093         strncpy(input->name, gspca_dev->sd_desc->name,
1094                 sizeof input->name);
1095         return 0;
1096 }
1097
1098 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1099 {
1100         *i = 0;
1101         return 0;
1102 }
1103
1104 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1105 {
1106         if (i > 0)
1107                 return -EINVAL;
1108         return (0);
1109 }
1110
1111 static int vidioc_reqbufs(struct file *file, void *priv,
1112                           struct v4l2_requestbuffers *rb)
1113 {
1114         struct gspca_dev *gspca_dev = priv;
1115         int i, ret = 0;
1116
1117         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1118                 return -EINVAL;
1119         switch (rb->memory) {
1120         case GSPCA_MEMORY_READ:                 /* (internal call) */
1121         case V4L2_MEMORY_MMAP:
1122         case V4L2_MEMORY_USERPTR:
1123                 break;
1124         default:
1125                 return -EINVAL;
1126         }
1127         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1128                 return -ERESTARTSYS;
1129
1130         if (gspca_dev->memory != GSPCA_MEMORY_NO
1131             && gspca_dev->memory != rb->memory) {
1132                 ret = -EBUSY;
1133                 goto out;
1134         }
1135
1136         /* only one file may do the capture */
1137         if (gspca_dev->capt_file != NULL
1138             && gspca_dev->capt_file != file) {
1139                 ret = -EBUSY;
1140                 goto out;
1141         }
1142
1143         /* if allocated, the buffers must not be mapped */
1144         for (i = 0; i < gspca_dev->nframes; i++) {
1145                 if (gspca_dev->frame[i].vma_use_count) {
1146                         ret = -EBUSY;
1147                         goto out;
1148                 }
1149         }
1150
1151         /* stop streaming */
1152         if (gspca_dev->streaming) {
1153                 mutex_lock(&gspca_dev->usb_lock);
1154                 gspca_stream_off(gspca_dev);
1155                 mutex_unlock(&gspca_dev->usb_lock);
1156         }
1157
1158         /* free the previous allocated buffers, if any */
1159         if (gspca_dev->nframes != 0) {
1160                 frame_free(gspca_dev);
1161                 gspca_dev->capt_file = NULL;
1162         }
1163         if (rb->count == 0)                     /* unrequest */
1164                 goto out;
1165         gspca_dev->memory = rb->memory;
1166         ret = frame_alloc(gspca_dev, rb->count);
1167         if (ret == 0) {
1168                 rb->count = gspca_dev->nframes;
1169                 gspca_dev->capt_file = file;
1170         }
1171 out:
1172         mutex_unlock(&gspca_dev->queue_lock);
1173         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1174         return ret;
1175 }
1176
1177 static int vidioc_querybuf(struct file *file, void *priv,
1178                            struct v4l2_buffer *v4l2_buf)
1179 {
1180         struct gspca_dev *gspca_dev = priv;
1181         struct gspca_frame *frame;
1182
1183         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1184             || v4l2_buf->index < 0
1185             || v4l2_buf->index >= gspca_dev->nframes)
1186                 return -EINVAL;
1187
1188         frame = &gspca_dev->frame[v4l2_buf->index];
1189         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1190         return 0;
1191 }
1192
1193 static int vidioc_streamon(struct file *file, void *priv,
1194                            enum v4l2_buf_type buf_type)
1195 {
1196         struct gspca_dev *gspca_dev = priv;
1197         int ret;
1198
1199         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1200                 return -EINVAL;
1201         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1202                 return -ERESTARTSYS;
1203         if (!gspca_dev->present) {
1204                 ret = -ENODEV;
1205                 goto out;
1206         }
1207         if (gspca_dev->nframes == 0) {
1208                 ret = -EINVAL;
1209                 goto out;
1210         }
1211         if (!gspca_dev->streaming) {
1212                 ret = gspca_init_transfer(gspca_dev);
1213                 if (ret < 0)
1214                         goto out;
1215         }
1216 #ifdef GSPCA_DEBUG
1217         if (gspca_debug & D_STREAM) {
1218                 PDEBUG_MODE("stream on OK",
1219                         gspca_dev->pixfmt,
1220                         gspca_dev->width,
1221                         gspca_dev->height);
1222         }
1223 #endif
1224         ret = 0;
1225 out:
1226         mutex_unlock(&gspca_dev->queue_lock);
1227         return ret;
1228 }
1229
1230 static int vidioc_streamoff(struct file *file, void *priv,
1231                                 enum v4l2_buf_type buf_type)
1232 {
1233         struct gspca_dev *gspca_dev = priv;
1234         int i, ret;
1235
1236         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1237                 return -EINVAL;
1238         if (!gspca_dev->streaming)
1239                 return 0;
1240         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1241                 return -ERESTARTSYS;
1242
1243         /* stop streaming */
1244         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1245                 ret = -ERESTARTSYS;
1246                 goto out;
1247         }
1248         gspca_stream_off(gspca_dev);
1249         mutex_unlock(&gspca_dev->usb_lock);
1250
1251         /* empty the application queues */
1252         for (i = 0; i < gspca_dev->nframes; i++)
1253                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1254         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1255         gspca_dev->last_packet_type = DISCARD_PACKET;
1256         gspca_dev->sequence = 0;
1257         ret = 0;
1258 out:
1259         mutex_unlock(&gspca_dev->queue_lock);
1260         return ret;
1261 }
1262
1263 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1264                         struct v4l2_jpegcompression *jpegcomp)
1265 {
1266         struct gspca_dev *gspca_dev = priv;
1267         int ret;
1268
1269         if (!gspca_dev->sd_desc->get_jcomp)
1270                 return -EINVAL;
1271         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1272                 return -ERESTARTSYS;
1273         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1274         mutex_unlock(&gspca_dev->usb_lock);
1275         return ret;
1276 }
1277
1278 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1279                         struct v4l2_jpegcompression *jpegcomp)
1280 {
1281         struct gspca_dev *gspca_dev = priv;
1282         int ret;
1283
1284         if (!gspca_dev->sd_desc->set_jcomp)
1285                 return -EINVAL;
1286         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1287                 return -ERESTARTSYS;
1288         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1289         mutex_unlock(&gspca_dev->usb_lock);
1290         return ret;
1291 }
1292
1293 static int vidioc_g_parm(struct file *filp, void *priv,
1294                         struct v4l2_streamparm *parm)
1295 {
1296         struct gspca_dev *gspca_dev = priv;
1297
1298         memset(parm, 0, sizeof *parm);
1299         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1300         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1301         return 0;
1302 }
1303
1304 static int vidioc_s_parm(struct file *filp, void *priv,
1305                         struct v4l2_streamparm *parm)
1306 {
1307         struct gspca_dev *gspca_dev = priv;
1308         int n;
1309
1310         n = parm->parm.capture.readbuffers;
1311         if (n == 0 || n > GSPCA_MAX_FRAMES)
1312                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1313         else
1314                 gspca_dev->nbufread = n;
1315         return 0;
1316 }
1317
1318 static int vidioc_s_std(struct file *filp, void *priv,
1319                         v4l2_std_id *parm)
1320 {
1321         return 0;
1322 }
1323
1324 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1325 static int vidiocgmbuf(struct file *file, void *priv,
1326                         struct video_mbuf *mbuf)
1327 {
1328         struct gspca_dev *gspca_dev = file->private_data;
1329         int i;
1330
1331         PDEBUG(D_STREAM, "cgmbuf");
1332         if (gspca_dev->nframes == 0) {
1333                 int ret;
1334
1335                 {
1336                         struct v4l2_format fmt;
1337
1338                         memset(&fmt, 0, sizeof fmt);
1339                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1340                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1341                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1342                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1343                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1344                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1345                         if (ret != 0)
1346                                 return ret;
1347                 }
1348                 {
1349                         struct v4l2_requestbuffers rb;
1350
1351                         memset(&rb, 0, sizeof rb);
1352                         rb.count = 4;
1353                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1354                         rb.memory = V4L2_MEMORY_MMAP;
1355                         ret = vidioc_reqbufs(file, priv, &rb);
1356                         if (ret != 0)
1357                                 return ret;
1358                 }
1359         }
1360         mbuf->frames = gspca_dev->nframes;
1361         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1362         for (i = 0; i < mbuf->frames; i++)
1363                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1364         return 0;
1365 }
1366 #endif
1367
1368 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1369 {
1370         struct gspca_dev *gspca_dev = file->private_data;
1371         struct gspca_frame *frame;
1372         struct page *page;
1373         unsigned long addr, start, size;
1374         int i, ret;
1375
1376         start = vma->vm_start;
1377         size = vma->vm_end - vma->vm_start;
1378         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1379
1380         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1381                 return -ERESTARTSYS;
1382         if (!gspca_dev->present) {
1383                 ret = -ENODEV;
1384                 goto out;
1385         }
1386         if (gspca_dev->capt_file != file) {
1387                 ret = -EINVAL;
1388                 goto out;
1389         }
1390
1391         frame = NULL;
1392         for (i = 0; i < gspca_dev->nframes; ++i) {
1393                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1394                         PDEBUG(D_STREAM, "mmap bad memory type");
1395                         break;
1396                 }
1397                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1398                                                 == vma->vm_pgoff) {
1399                         frame = &gspca_dev->frame[i];
1400                         break;
1401                 }
1402         }
1403         if (frame == NULL) {
1404                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1405                 ret = -EINVAL;
1406                 goto out;
1407         }
1408 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1409         /* v4l1 maps all the buffers */
1410         if (i != 0
1411             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1412 #endif
1413             if (size != frame->v4l2_buf.length) {
1414                 PDEBUG(D_STREAM, "mmap bad size");
1415                 ret = -EINVAL;
1416                 goto out;
1417         }
1418
1419         /*
1420          * - VM_IO marks the area as being a mmaped region for I/O to a
1421          *   device. It also prevents the region from being core dumped.
1422          */
1423         vma->vm_flags |= VM_IO;
1424
1425         addr = (unsigned long) frame->data;
1426         while (size > 0) {
1427                 page = vmalloc_to_page((void *) addr);
1428                 ret = vm_insert_page(vma, start, page);
1429                 if (ret < 0)
1430                         goto out;
1431                 start += PAGE_SIZE;
1432                 addr += PAGE_SIZE;
1433                 size -= PAGE_SIZE;
1434         }
1435
1436         vma->vm_ops = &gspca_vm_ops;
1437         vma->vm_private_data = frame;
1438         gspca_vm_open(vma);
1439         ret = 0;
1440 out:
1441         mutex_unlock(&gspca_dev->queue_lock);
1442         return ret;
1443 }
1444
1445 /*
1446  * wait for a video frame
1447  *
1448  * If a frame is ready, its index is returned.
1449  */
1450 static int frame_wait(struct gspca_dev *gspca_dev,
1451                         int nonblock_ing)
1452 {
1453         struct gspca_frame *frame;
1454         int i, j, ret;
1455
1456         /* check if a frame is ready */
1457         i = gspca_dev->fr_o;
1458         j = gspca_dev->fr_queue[i];
1459         frame = &gspca_dev->frame[j];
1460
1461         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1462                 if (nonblock_ing)
1463                         return -EAGAIN;
1464
1465                 /* wait till a frame is ready */
1466                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1467                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1468                         !gspca_dev->streaming || !gspca_dev->present,
1469                         msecs_to_jiffies(3000));
1470                 if (ret < 0)
1471                         return ret;
1472                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1473                         return -EIO;
1474         }
1475
1476         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1477         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1478                 gspca_dev->fr_q,
1479                 gspca_dev->fr_i,
1480                 gspca_dev->fr_o);
1481
1482         if (gspca_dev->sd_desc->dq_callback) {
1483                 mutex_lock(&gspca_dev->usb_lock);
1484                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1485                 mutex_unlock(&gspca_dev->usb_lock);
1486         }
1487         return j;
1488 }
1489
1490 /*
1491  * dequeue a video buffer
1492  *
1493  * If nonblock_ing is false, block until a buffer is available.
1494  */
1495 static int vidioc_dqbuf(struct file *file, void *priv,
1496                         struct v4l2_buffer *v4l2_buf)
1497 {
1498         struct gspca_dev *gspca_dev = priv;
1499         struct gspca_frame *frame;
1500         int i, ret;
1501
1502         PDEBUG(D_FRAM, "dqbuf");
1503         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1504                 return -EINVAL;
1505         if (v4l2_buf->memory != gspca_dev->memory)
1506                 return -EINVAL;
1507
1508         /* if not streaming, be sure the application will not loop forever */
1509         if (!(file->f_flags & O_NONBLOCK)
1510             && !gspca_dev->streaming && gspca_dev->users == 1)
1511                 return -EINVAL;
1512
1513         /* only the capturing file may dequeue */
1514         if (gspca_dev->capt_file != file)
1515                 return -EINVAL;
1516
1517         /* only one dequeue / read at a time */
1518         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1519                 return -ERESTARTSYS;
1520
1521         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1522         if (ret < 0)
1523                 goto out;
1524         i = ret;                                /* frame index */
1525         frame = &gspca_dev->frame[i];
1526         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1527                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1528                                  frame->data,
1529                                  frame->v4l2_buf.bytesused)) {
1530                         PDEBUG(D_ERR|D_STREAM,
1531                                 "dqbuf cp to user failed");
1532                         ret = -EFAULT;
1533                         goto out;
1534                 }
1535         }
1536         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1537         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1538         PDEBUG(D_FRAM, "dqbuf %d", i);
1539         ret = 0;
1540 out:
1541         mutex_unlock(&gspca_dev->read_lock);
1542         return ret;
1543 }
1544
1545 /*
1546  * queue a video buffer
1547  *
1548  * Attempting to queue a buffer that has already been
1549  * queued will return -EINVAL.
1550  */
1551 static int vidioc_qbuf(struct file *file, void *priv,
1552                         struct v4l2_buffer *v4l2_buf)
1553 {
1554         struct gspca_dev *gspca_dev = priv;
1555         struct gspca_frame *frame;
1556         int i, index, ret;
1557
1558         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1559         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1560                 return -EINVAL;
1561
1562         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1563                 return -ERESTARTSYS;
1564
1565         index = v4l2_buf->index;
1566         if ((unsigned) index >= gspca_dev->nframes) {
1567                 PDEBUG(D_FRAM,
1568                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1569                 ret = -EINVAL;
1570                 goto out;
1571         }
1572         if (v4l2_buf->memory != gspca_dev->memory) {
1573                 PDEBUG(D_FRAM, "qbuf bad memory type");
1574                 ret = -EINVAL;
1575                 goto out;
1576         }
1577
1578         frame = &gspca_dev->frame[index];
1579         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1580                 PDEBUG(D_FRAM, "qbuf bad state");
1581                 ret = -EINVAL;
1582                 goto out;
1583         }
1584
1585         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1586
1587         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1588                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1589                 frame->v4l2_buf.length = v4l2_buf->length;
1590         }
1591
1592         /* put the buffer in the 'queued' queue */
1593         i = gspca_dev->fr_q;
1594         gspca_dev->fr_queue[i] = index;
1595         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1596         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1597                 gspca_dev->fr_q,
1598                 gspca_dev->fr_i,
1599                 gspca_dev->fr_o);
1600
1601         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1602         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1603         ret = 0;
1604 out:
1605         mutex_unlock(&gspca_dev->queue_lock);
1606         return ret;
1607 }
1608
1609 /*
1610  * allocate the resources for read()
1611  */
1612 static int read_alloc(struct gspca_dev *gspca_dev,
1613                         struct file *file)
1614 {
1615         struct v4l2_buffer v4l2_buf;
1616         int i, ret;
1617
1618         PDEBUG(D_STREAM, "read alloc");
1619         if (gspca_dev->nframes == 0) {
1620                 struct v4l2_requestbuffers rb;
1621
1622                 memset(&rb, 0, sizeof rb);
1623                 rb.count = gspca_dev->nbufread;
1624                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1625                 rb.memory = GSPCA_MEMORY_READ;
1626                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1627                 if (ret != 0) {
1628                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1629                         return ret;
1630                 }
1631                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1632                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1633                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1634                 for (i = 0; i < gspca_dev->nbufread; i++) {
1635                         v4l2_buf.index = i;
1636                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1637                         if (ret != 0) {
1638                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1639                                 return ret;
1640                         }
1641                 }
1642                 gspca_dev->memory = GSPCA_MEMORY_READ;
1643         }
1644
1645         /* start streaming */
1646         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1647         if (ret != 0)
1648                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1649         return ret;
1650 }
1651
1652 static unsigned int dev_poll(struct file *file, poll_table *wait)
1653 {
1654         struct gspca_dev *gspca_dev = file->private_data;
1655         int i, ret;
1656
1657         PDEBUG(D_FRAM, "poll");
1658
1659         poll_wait(file, &gspca_dev->wq, wait);
1660         if (!gspca_dev->present)
1661                 return POLLERR;
1662
1663         /* if reqbufs is not done, the user would use read() */
1664         if (gspca_dev->nframes == 0) {
1665                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1666                         return POLLERR;         /* not the 1st time */
1667                 ret = read_alloc(gspca_dev, file);
1668                 if (ret != 0)
1669                         return POLLERR;
1670         }
1671
1672         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1673                 return POLLERR;
1674         if (!gspca_dev->present) {
1675                 ret = POLLERR;
1676                 goto out;
1677         }
1678
1679         /* check the next incoming buffer */
1680         i = gspca_dev->fr_o;
1681         i = gspca_dev->fr_queue[i];
1682         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1683                 ret = POLLIN | POLLRDNORM;      /* something to read */
1684         else
1685                 ret = 0;
1686 out:
1687         mutex_unlock(&gspca_dev->queue_lock);
1688         return ret;
1689 }
1690
1691 static ssize_t dev_read(struct file *file, char __user *data,
1692                     size_t count, loff_t *ppos)
1693 {
1694         struct gspca_dev *gspca_dev = file->private_data;
1695         struct gspca_frame *frame;
1696         struct v4l2_buffer v4l2_buf;
1697         struct timeval timestamp;
1698         int n, ret, ret2;
1699
1700         PDEBUG(D_FRAM, "read (%zd)", count);
1701         if (!gspca_dev->present)
1702                 return -ENODEV;
1703         switch (gspca_dev->memory) {
1704         case GSPCA_MEMORY_NO:                   /* first time */
1705                 ret = read_alloc(gspca_dev, file);
1706                 if (ret != 0)
1707                         return ret;
1708                 break;
1709         case GSPCA_MEMORY_READ:
1710                 if (gspca_dev->capt_file == file)
1711                         break;
1712                 /* fall thru */
1713         default:
1714                 return -EINVAL;
1715         }
1716
1717         /* get a frame */
1718         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1719         timestamp.tv_sec--;
1720         n = 2;
1721         for (;;) {
1722                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1723                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1724                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1725                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1726                 if (ret != 0) {
1727                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1728                         return ret;
1729                 }
1730
1731                 /* if the process slept for more than 1 second,
1732                  * get a newer frame */
1733                 frame = &gspca_dev->frame[v4l2_buf.index];
1734                 if (--n < 0)
1735                         break;                  /* avoid infinite loop */
1736                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1737                         break;
1738                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1739                 if (ret != 0) {
1740                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1741                         return ret;
1742                 }
1743         }
1744
1745         /* copy the frame */
1746         if (count > frame->v4l2_buf.bytesused)
1747                 count = frame->v4l2_buf.bytesused;
1748         ret = copy_to_user(data, frame->data, count);
1749         if (ret != 0) {
1750                 PDEBUG(D_ERR|D_STREAM,
1751                         "read cp to user lack %d / %zd", ret, count);
1752                 ret = -EFAULT;
1753                 goto out;
1754         }
1755         ret = count;
1756 out:
1757         /* in each case, requeue the buffer */
1758         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1759         if (ret2 != 0)
1760                 return ret2;
1761         return ret;
1762 }
1763
1764 static struct file_operations dev_fops = {
1765         .owner = THIS_MODULE,
1766         .open = dev_open,
1767         .release = dev_close,
1768         .read = dev_read,
1769         .mmap = dev_mmap,
1770         .ioctl = video_ioctl2,
1771 #ifdef CONFIG_COMPAT
1772         .compat_ioctl = v4l_compat_ioctl32,
1773 #endif
1774         .llseek = no_llseek,
1775         .poll   = dev_poll,
1776 };
1777
1778 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1779         .vidioc_querycap        = vidioc_querycap,
1780         .vidioc_dqbuf           = vidioc_dqbuf,
1781         .vidioc_qbuf            = vidioc_qbuf,
1782         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1783         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1784         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1785         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1786         .vidioc_streamon        = vidioc_streamon,
1787         .vidioc_queryctrl       = vidioc_queryctrl,
1788         .vidioc_g_ctrl          = vidioc_g_ctrl,
1789         .vidioc_s_ctrl          = vidioc_s_ctrl,
1790         .vidioc_querymenu       = vidioc_querymenu,
1791         .vidioc_enum_input      = vidioc_enum_input,
1792         .vidioc_g_input         = vidioc_g_input,
1793         .vidioc_s_input         = vidioc_s_input,
1794         .vidioc_reqbufs         = vidioc_reqbufs,
1795         .vidioc_querybuf        = vidioc_querybuf,
1796         .vidioc_streamoff       = vidioc_streamoff,
1797         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1798         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1799         .vidioc_g_parm          = vidioc_g_parm,
1800         .vidioc_s_parm          = vidioc_s_parm,
1801         .vidioc_s_std           = vidioc_s_std,
1802 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1803         .vidiocgmbuf          = vidiocgmbuf,
1804 #endif
1805 };
1806
1807 static struct video_device gspca_template = {
1808         .name = "gspca main driver",
1809         .fops = &dev_fops,
1810         .ioctl_ops = &dev_ioctl_ops,
1811         .release = gspca_release,
1812         .minor = -1,
1813 };
1814
1815 /*
1816  * probe and create a new gspca device
1817  *
1818  * This function must be called by the sub-driver when it is
1819  * called for probing a new device.
1820  */
1821 int gspca_dev_probe(struct usb_interface *intf,
1822                 const struct usb_device_id *id,
1823                 const struct sd_desc *sd_desc,
1824                 int dev_size,
1825                 struct module *module)
1826 {
1827         struct usb_interface_descriptor *interface;
1828         struct gspca_dev *gspca_dev;
1829         struct usb_device *dev = interface_to_usbdev(intf);
1830         int ret;
1831
1832         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1833
1834         /* we don't handle multi-config cameras */
1835         if (dev->descriptor.bNumConfigurations != 1)
1836                 return -ENODEV;
1837         interface = &intf->cur_altsetting->desc;
1838         if (interface->bInterfaceNumber > 0)
1839                 return -ENODEV;
1840
1841         /* create the device */
1842         if (dev_size < sizeof *gspca_dev)
1843                 dev_size = sizeof *gspca_dev;
1844         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1845         if (!gspca_dev) {
1846                 err("couldn't kzalloc gspca struct");
1847                 return -ENOMEM;
1848         }
1849         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1850         if (!gspca_dev->usb_buf) {
1851                 err("out of memory");
1852                 ret = -ENOMEM;
1853                 goto out;
1854         }
1855         gspca_dev->dev = dev;
1856         gspca_dev->iface = interface->bInterfaceNumber;
1857         gspca_dev->nbalt = intf->num_altsetting;
1858         gspca_dev->sd_desc = sd_desc;
1859         gspca_dev->nbufread = 2;
1860         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1861
1862         /* configure the subdriver and initialize the USB device */
1863         ret = sd_desc->config(gspca_dev, id);
1864         if (ret < 0)
1865                 goto out;
1866         ret = sd_desc->init(gspca_dev);
1867         if (ret < 0)
1868                 goto out;
1869         ret = gspca_set_alt0(gspca_dev);
1870         if (ret < 0)
1871                 goto out;
1872         gspca_set_default_mode(gspca_dev);
1873
1874         mutex_init(&gspca_dev->usb_lock);
1875         mutex_init(&gspca_dev->read_lock);
1876         mutex_init(&gspca_dev->queue_lock);
1877         init_waitqueue_head(&gspca_dev->wq);
1878
1879         /* init video stuff */
1880         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1881         gspca_dev->vdev.parent = &dev->dev;
1882         gspca_dev->module = module;
1883         gspca_dev->present = 1;
1884         ret = video_register_device(&gspca_dev->vdev,
1885                                   VFL_TYPE_GRABBER,
1886                                   video_nr);
1887         if (ret < 0) {
1888                 err("video_register_device err %d", ret);
1889                 goto out;
1890         }
1891
1892         usb_set_intfdata(intf, gspca_dev);
1893         PDEBUG(D_PROBE, "probe ok");
1894         return 0;
1895 out:
1896         kfree(gspca_dev->usb_buf);
1897         kfree(gspca_dev);
1898         return ret;
1899 }
1900 EXPORT_SYMBOL(gspca_dev_probe);
1901
1902 /*
1903  * USB disconnection
1904  *
1905  * This function must be called by the sub-driver
1906  * when the device disconnects, after the specific resources are freed.
1907  */
1908 void gspca_disconnect(struct usb_interface *intf)
1909 {
1910         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1911
1912         gspca_dev->present = 0;
1913         gspca_dev->streaming = 0;
1914
1915         usb_set_intfdata(intf, NULL);
1916
1917         /* release the device */
1918         /* (this will call gspca_release() immediatly or on last close) */
1919         video_unregister_device(&gspca_dev->vdev);
1920
1921         PDEBUG(D_PROBE, "disconnect complete");
1922 }
1923 EXPORT_SYMBOL(gspca_disconnect);
1924
1925 #ifdef CONFIG_PM
1926 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1927 {
1928         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1929
1930         if (!gspca_dev->streaming)
1931                 return 0;
1932         gspca_dev->frozen = 1;          /* avoid urb error messages */
1933         if (gspca_dev->sd_desc->stopN)
1934                 gspca_dev->sd_desc->stopN(gspca_dev);
1935         destroy_urbs(gspca_dev);
1936         gspca_set_alt0(gspca_dev);
1937         if (gspca_dev->sd_desc->stop0)
1938                 gspca_dev->sd_desc->stop0(gspca_dev);
1939         return 0;
1940 }
1941 EXPORT_SYMBOL(gspca_suspend);
1942
1943 int gspca_resume(struct usb_interface *intf)
1944 {
1945         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1946
1947         gspca_dev->frozen = 0;
1948         gspca_dev->sd_desc->init(gspca_dev);
1949         if (gspca_dev->streaming)
1950                 return gspca_init_transfer(gspca_dev);
1951         return 0;
1952 }
1953 EXPORT_SYMBOL(gspca_resume);
1954 #endif
1955 /* -- cam driver utility functions -- */
1956
1957 /* auto gain and exposure algorithm based on the knee algorithm described here:
1958    http://ytse.tricolour.net/docs/LowLightOptimization.html
1959
1960    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1961    where changed. */
1962 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1963         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1964 {
1965         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1966         const struct ctrl *gain_ctrl = NULL;
1967         const struct ctrl *exposure_ctrl = NULL;
1968         const struct ctrl *autogain_ctrl = NULL;
1969         int retval = 0;
1970
1971         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1972                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1973                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1974                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1975                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1977                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1978         }
1979         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1980                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1981                         "on cam without (auto)gain/exposure");
1982                 return 0;
1983         }
1984
1985         if (gain_ctrl->get(gspca_dev, &gain) ||
1986                         exposure_ctrl->get(gspca_dev, &exposure) ||
1987                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1988                 return 0;
1989
1990         orig_gain = gain;
1991         orig_exposure = exposure;
1992
1993         /* If we are of a multiple of deadzone, do multiple steps to reach the
1994            desired lumination fast (with the risc of a slight overshoot) */
1995         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1996
1997         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
1998                 avg_lum, desired_avg_lum, steps);
1999
2000         for (i = 0; i < steps; i++) {
2001                 if (avg_lum > desired_avg_lum) {
2002                         if (gain > gain_knee)
2003                                 gain--;
2004                         else if (exposure > exposure_knee)
2005                                 exposure--;
2006                         else if (gain > gain_ctrl->qctrl.default_value)
2007                                 gain--;
2008                         else if (exposure > exposure_ctrl->qctrl.minimum)
2009                                 exposure--;
2010                         else if (gain > gain_ctrl->qctrl.minimum)
2011                                 gain--;
2012                         else
2013                                 break;
2014                 } else {
2015                         if (gain < gain_ctrl->qctrl.default_value)
2016                                 gain++;
2017                         else if (exposure < exposure_knee)
2018                                 exposure++;
2019                         else if (gain < gain_knee)
2020                                 gain++;
2021                         else if (exposure < exposure_ctrl->qctrl.maximum)
2022                                 exposure++;
2023                         else if (gain < gain_ctrl->qctrl.maximum)
2024                                 gain++;
2025                         else
2026                                 break;
2027                 }
2028         }
2029
2030         if (gain != orig_gain) {
2031                 gain_ctrl->set(gspca_dev, gain);
2032                 retval = 1;
2033         }
2034         if (exposure != orig_exposure) {
2035                 exposure_ctrl->set(gspca_dev, exposure);
2036                 retval = 1;
2037         }
2038
2039         return retval;
2040 }
2041 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2042
2043 /* -- module insert / remove -- */
2044 static int __init gspca_init(void)
2045 {
2046         info("main v%d.%d.%d registered",
2047                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2048                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2049                 DRIVER_VERSION_NUMBER & 0xff);
2050         return 0;
2051 }
2052 static void __exit gspca_exit(void)
2053 {
2054         info("main deregistered");
2055 }
2056
2057 module_init(gspca_init);
2058 module_exit(gspca_exit);
2059
2060 #ifdef GSPCA_DEBUG
2061 module_param_named(debug, gspca_debug, int, 0644);
2062 MODULE_PARM_DESC(debug,
2063                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2064                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2065                 " 0x0100: v4l2");
2066 #endif