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                 if (!gspca_dev->present)
 427                         usb_kill_urb(urb);
 428                 if (urb->transfer_buffer != NULL)
 429                         usb_buffer_free(gspca_dev->dev,
 430                                         urb->transfer_buffer_length,
 431                                         urb->transfer_buffer,
 432                                         urb->transfer_dma);
 433                 usb_free_urb(urb);
 434         }
 435 }
 436
 437 /*
 438  * look for an input transfer endpoint in an alternate setting
 439  */
 440 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 441                                           __u8 epaddr,
 442                                           __u8 xfer)
 443 {
 444         struct usb_host_endpoint *ep;
 445         int i, attr;
 446
 447         epaddr |= USB_DIR_IN;
 448         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 449                 ep = &alt->endpoint[i];
 450                 if (ep->desc.bEndpointAddress == epaddr) {
 451                         attr = ep->desc.bmAttributes
 452                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 453                         if (attr == xfer)
 454                                 return ep;
 455                         break;
 456                 }
 457         }
 458         return NULL;
 459 }
 460
 461 /*
 462  * look for an input (isoc or bulk) endpoint
 463  *
 464  * The endpoint is defined by the subdriver.
 465  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 466  * This routine may be called many times when the bandwidth is too small
 467  * (the bandwidth is checked on urb submit).
 468  */
 469 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 470 {
 471         struct usb_interface *intf;
 472         struct usb_host_endpoint *ep;
 473         int i, ret;
 474
 475         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 476         ep = NULL;
 477         i = gspca_dev->alt;                     /* previous alt setting */
 478
 479         /* try isoc */
 480         while (--i > 0) {                       /* alt 0 is unusable */
 481                 ep = alt_xfer(&intf->altsetting[i],
 482                                 gspca_dev->cam.epaddr,
 483                                 USB_ENDPOINT_XFER_ISOC);
 484                 if (ep)
 485                         break;
 486         }
 487
 488         /* if no isoc, try bulk */
 489         if (ep == NULL) {
 490                 ep = alt_xfer(&intf->altsetting[0],
 491                                 gspca_dev->cam.epaddr,
 492                                 USB_ENDPOINT_XFER_BULK);
 493                 if (ep == NULL) {
 494                         err("no transfer endpoint found");
 495                         return NULL;
 496                 }
 497         }
 498         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 499                         i, ep->desc.bEndpointAddress);
 500         if (i > 0) {
 501                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 502                 if (ret < 0) {
 503                         err("set interface err %d", ret);
 504                         return NULL;
 505                 }
 506         }
 507         gspca_dev->alt = i;             /* memorize the current alt setting */
 508         return ep;
 509 }
 510
 511 /*
 512  * create the URBs for image transfer
 513  */
 514 static int create_urbs(struct gspca_dev *gspca_dev,
 515                         struct usb_host_endpoint *ep)
 516 {
 517         struct urb *urb;
 518         int n, nurbs, i, psize, npkt, bsize;
 519
 520         /* calculate the packet size and the number of packets */
 521         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 522
 523         if (gspca_dev->alt != 0) {              /* isoc */
 524
 525                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 526                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 527                 npkt = ISO_MAX_SIZE / psize;
 528                 if (npkt > ISO_MAX_PKT)
 529                         npkt = ISO_MAX_PKT;
 530                 bsize = psize * npkt;
 531                 PDEBUG(D_STREAM,
 532                         "isoc %d pkts size %d = bsize:%d",
 533                         npkt, psize, bsize);
 534                 nurbs = DEF_NURBS;
 535         } else {                                /* bulk */
 536                 npkt = 0;
 537                 bsize = gspca_dev->cam.bulk_size;
 538                 if (bsize == 0)
 539                         bsize = psize;
 540                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 541                 if (gspca_dev->cam.bulk_nurbs != 0)
 542                         nurbs = gspca_dev->cam.bulk_nurbs;
 543                 else
 544                         nurbs = 1;
 545         }
 546
 547         gspca_dev->nurbs = nurbs;
 548         for (n = 0; n < nurbs; n++) {
 549                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 550                 if (!urb) {
 551                         err("usb_alloc_urb failed");
 552                         destroy_urbs(gspca_dev);
 553                         return -ENOMEM;
 554                 }
 555                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 556                                                 bsize,
 557                                                 GFP_KERNEL,
 558                                                 &urb->transfer_dma);
 559
 560                 if (urb->transfer_buffer == NULL) {
 561                         usb_free_urb(urb);
 562                         err("usb_buffer_urb failed");
 563                         destroy_urbs(gspca_dev);
 564                         return -ENOMEM;
 565                 }
 566                 gspca_dev->urb[n] = urb;
 567                 urb->dev = gspca_dev->dev;
 568                 urb->context = gspca_dev;
 569                 urb->transfer_buffer_length = bsize;
 570                 if (npkt != 0) {                /* ISOC */
 571                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 572                                                     ep->desc.bEndpointAddress);
 573                         urb->transfer_flags = URB_ISO_ASAP
 574                                         | URB_NO_TRANSFER_DMA_MAP;
 575                         urb->interval = ep->desc.bInterval;
 576                         urb->complete = isoc_irq;
 577                         urb->number_of_packets = npkt;
 578                         for (i = 0; i < npkt; i++) {
 579                                 urb->iso_frame_desc[i].length = psize;
 580                                 urb->iso_frame_desc[i].offset = psize * i;
 581                         }
 582                 } else {                /* bulk */
 583                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 584                                                 ep->desc.bEndpointAddress),
 585                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 586                         urb->complete = bulk_irq;
 587                 }
 588         }
 589         return 0;
 590 }
 591
 592 /*
 593  * start the USB transfer
 594  */
 595 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 596 {
 597         struct usb_host_endpoint *ep;
 598         int n, ret;
 599
 600         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 601                 return -ERESTARTSYS;
 602
 603         /* set the higher alternate setting and
 604          * loop until urb submit succeeds */
 605         gspca_dev->alt = gspca_dev->nbalt;
 606         for (;;) {
 607                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 608                 ep = get_ep(gspca_dev);
 609                 if (ep == NULL) {
 610                         ret = -EIO;
 611                         goto out;
 612                 }
 613                 ret = create_urbs(gspca_dev, ep);
 614                 if (ret < 0)
 615                         goto out;
 616
 617                 /* clear the bulk endpoint */
 618                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 619                         usb_clear_halt(gspca_dev->dev,
 620                                         usb_rcvintpipe(gspca_dev->dev,
 621                                                  gspca_dev->cam.epaddr));
 622
 623                 /* start the cam */
 624                 ret = gspca_dev->sd_desc->start(gspca_dev);
 625                 if (ret < 0) {
 626                         destroy_urbs(gspca_dev);
 627                         goto out;
 628                 }
 629                 gspca_dev->streaming = 1;
 630
 631                 /* some bulk transfers are started by the subdriver */
 632                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
 633                         break;
 634
 635                 /* submit the URBs */
 636                 for (n = 0; n < gspca_dev->nurbs; n++) {
 637                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 638                         if (ret < 0) {
 639                                 PDEBUG(D_ERR|D_STREAM,
 640                                         "usb_submit_urb [%d] err %d", n, ret);
 641                                 gspca_dev->streaming = 0;
 642                                 destroy_urbs(gspca_dev);
 643                                 if (ret == -ENOSPC) {
 644                                         msleep(20);     /* wait for kill
 645                                                          * complete */
 646                                         break;  /* try the previous alt */
 647                                 }
 648                                 goto out;
 649                         }
 650                 }
 651                 if (ret >= 0)
 652                         break;
 653         }
 654 out:
 655         mutex_unlock(&gspca_dev->usb_lock);
 656         return ret;
 657 }
 658
 659 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 660 {
 661         int ret;
 662
 663         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 664         if (ret < 0)
 665                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 666         return ret;
 667 }
 668
 669 /* Note: both the queue and the usb locks should be held when calling this */
 670 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 671 {
 672         gspca_dev->streaming = 0;
 673         if (gspca_dev->present
 674             && gspca_dev->sd_desc->stopN)
 675                 gspca_dev->sd_desc->stopN(gspca_dev);
 676         destroy_urbs(gspca_dev);
 677         gspca_set_alt0(gspca_dev);
 678         if (gspca_dev->sd_desc->stop0)
 679                 gspca_dev->sd_desc->stop0(gspca_dev);
 680         PDEBUG(D_STREAM, "stream off OK");
 681 }
 682
 683 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 684 {
 685         int i;
 686
 687         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 688         gspca_dev->curr_mode = i;
 689         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 690         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 691         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 692 }
 693
 694 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 695                         int width, int height)
 696 {
 697         int i;
 698
 699         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 700                 if (width >= gspca_dev->cam.cam_mode[i].width
 701                     && height >= gspca_dev->cam.cam_mode[i].height)
 702                         break;
 703         }
 704         return i;
 705 }
 706
 707 /*
 708  * search a mode with the right pixel format
 709  */
 710 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 711                         int mode,
 712                         int pixfmt)
 713 {
 714         int modeU, modeD;
 715
 716         modeU = modeD = mode;
 717         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 718                 if (--modeD >= 0) {
 719                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 720                                                                 == pixfmt)
 721                                 return modeD;
 722                 }
 723                 if (++modeU < gspca_dev->cam.nmodes) {
 724                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 725                                                                 == pixfmt)
 726                                 return modeU;
 727                 }
 728         }
 729         return -EINVAL;
 730 }
 731
 732 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 733                                 struct v4l2_fmtdesc *fmtdesc)
 734 {
 735         struct gspca_dev *gspca_dev = priv;
 736         int i, j, index;
 737         __u32 fmt_tb[8];
 738
 739         /* give an index to each format */
 740         index = 0;
 741         j = 0;
 742         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 743                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 744                 j = 0;
 745                 for (;;) {
 746                         if (fmt_tb[j] == fmt_tb[index])
 747                                 break;
 748                         j++;
 749                 }
 750                 if (j == index) {
 751                         if (fmtdesc->index == index)
 752                                 break;          /* new format */
 753                         index++;
 754                         if (index >= ARRAY_SIZE(fmt_tb))
 755                                 return -EINVAL;
 756                 }
 757         }
 758         if (i < 0)
 759                 return -EINVAL;         /* no more format */
 760
 761         fmtdesc->pixelformat = fmt_tb[index];
 762         if (gspca_is_compressed(fmt_tb[index]))
 763                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 764         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 765         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 766         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 767         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 768         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 769         fmtdesc->description[4] = '\0';
 770         return 0;
 771 }
 772
 773 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 774                             struct v4l2_format *fmt)
 775 {
 776         struct gspca_dev *gspca_dev = priv;
 777         int mode;
 778
 779         mode = gspca_dev->curr_mode;
 780         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 781                 sizeof fmt->fmt.pix);
 782         return 0;
 783 }
 784
 785 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 786                         struct v4l2_format *fmt)
 787 {
 788         int w, h, mode, mode2;
 789
 790         w = fmt->fmt.pix.width;
 791         h = fmt->fmt.pix.height;
 792
 793 #ifdef GSPCA_DEBUG
 794         if (gspca_debug & D_CONF)
 795                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 796 #endif
 797         /* search the closest mode for width and height */
 798         mode = wxh_to_mode(gspca_dev, w, h);
 799
 800         /* OK if right palette */
 801         if (gspca_dev->cam.cam_mode[mode].pixelformat
 802                                                 != fmt->fmt.pix.pixelformat) {
 803
 804                 /* else, search the closest mode with the same pixel format */
 805                 mode2 = gspca_get_mode(gspca_dev, mode,
 806                                         fmt->fmt.pix.pixelformat);
 807                 if (mode2 >= 0)
 808                         mode = mode2;
 809 /*              else
 810                         ;                * no chance, return this mode */
 811         }
 812         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 813                 sizeof fmt->fmt.pix);
 814         return mode;                    /* used when s_fmt */
 815 }
 816
 817 static int vidioc_try_fmt_vid_cap(struct file *file,
 818                               void *priv,
 819                               struct v4l2_format *fmt)
 820 {
 821         struct gspca_dev *gspca_dev = priv;
 822         int ret;
 823
 824         ret = try_fmt_vid_cap(gspca_dev, fmt);
 825         if (ret < 0)
 826                 return ret;
 827         return 0;
 828 }
 829
 830 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 831                             struct v4l2_format *fmt)
 832 {
 833         struct gspca_dev *gspca_dev = priv;
 834         int ret;
 835
 836         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 837                 return -ERESTARTSYS;
 838
 839         ret = try_fmt_vid_cap(gspca_dev, fmt);
 840         if (ret < 0)
 841                 goto out;
 842
 843         if (gspca_dev->nframes != 0
 844             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 845                 ret = -EINVAL;
 846                 goto out;
 847         }
 848
 849         if (ret == gspca_dev->curr_mode) {
 850                 ret = 0;
 851                 goto out;                       /* same mode */
 852         }
 853
 854         if (gspca_dev->streaming) {
 855                 ret = -EBUSY;
 856                 goto out;
 857         }
 858         gspca_dev->width = fmt->fmt.pix.width;
 859         gspca_dev->height = fmt->fmt.pix.height;
 860         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 861         gspca_dev->curr_mode = ret;
 862
 863         ret = 0;
 864 out:
 865         mutex_unlock(&gspca_dev->queue_lock);
 866         return ret;
 867 }
 868
 869 static void gspca_release(struct video_device *vfd)
 870 {
 871         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 872
 873         PDEBUG(D_STREAM, "device released");
 874
 875         kfree(gspca_dev->usb_buf);
 876         kfree(gspca_dev);
 877 }
 878
 879 static int dev_open(struct file *file)
 880 {
 881         struct gspca_dev *gspca_dev;
 882         int ret;
 883
 884         PDEBUG(D_STREAM, "%s open", current->comm);
 885         gspca_dev = (struct gspca_dev *) video_devdata(file);
 886         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 887                 return -ERESTARTSYS;
 888         if (!gspca_dev->present) {
 889                 ret = -ENODEV;
 890                 goto out;
 891         }
 892
 893         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 894                 ret = -EBUSY;
 895                 goto out;
 896         }
 897
 898         /* protect the subdriver against rmmod */
 899         if (!try_module_get(gspca_dev->module)) {
 900                 ret = -ENODEV;
 901                 goto out;
 902         }
 903
 904         gspca_dev->users++;
 905
 906         file->private_data = gspca_dev;
 907 #ifdef GSPCA_DEBUG
 908         /* activate the v4l2 debug */
 909         if (gspca_debug & D_V4L2)
 910                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 911                                         | V4L2_DEBUG_IOCTL_ARG;
 912         else
 913                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 914                                         | V4L2_DEBUG_IOCTL_ARG);
 915 #endif
 916         ret = 0;
 917 out:
 918         mutex_unlock(&gspca_dev->queue_lock);
 919         if (ret != 0)
 920                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 921         else
 922                 PDEBUG(D_STREAM, "open done");
 923         return ret;
 924 }
 925
 926 static int dev_close(struct file *file)
 927 {
 928         struct gspca_dev *gspca_dev = file->private_data;
 929
 930         PDEBUG(D_STREAM, "%s close", current->comm);
 931         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 932                 return -ERESTARTSYS;
 933         gspca_dev->users--;
 934
 935         /* if the file did the capture, free the streaming resources */
 936         if (gspca_dev->capt_file == file) {
 937                 if (gspca_dev->streaming) {
 938                         mutex_lock(&gspca_dev->usb_lock);
 939                         gspca_stream_off(gspca_dev);
 940                         mutex_unlock(&gspca_dev->usb_lock);
 941                 }
 942                 frame_free(gspca_dev);
 943                 gspca_dev->capt_file = NULL;
 944                 gspca_dev->memory = GSPCA_MEMORY_NO;
 945         }
 946         file->private_data = NULL;
 947         module_put(gspca_dev->module);
 948         mutex_unlock(&gspca_dev->queue_lock);
 949
 950         PDEBUG(D_STREAM, "close done");
 951
 952         return 0;
 953 }
 954
 955 static int vidioc_querycap(struct file *file, void  *priv,
 956                            struct v4l2_capability *cap)
 957 {
 958         struct gspca_dev *gspca_dev = priv;
 959
 960         memset(cap, 0, sizeof *cap);
 961         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 962         if (gspca_dev->dev->product != NULL) {
 963                 strncpy(cap->card, gspca_dev->dev->product,
 964                         sizeof cap->card);
 965         } else {
 966                 snprintf(cap->card, sizeof cap->card,
 967                         "USB Camera (%04x:%04x)",
 968                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 969                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 970         }
 971         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 972                 sizeof cap->bus_info);
 973         cap->version = DRIVER_VERSION_NUMBER;
 974         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 975                           | V4L2_CAP_STREAMING
 976                           | V4L2_CAP_READWRITE;
 977         return 0;
 978 }
 979
 980 static int vidioc_queryctrl(struct file *file, void *priv,
 981                            struct v4l2_queryctrl *q_ctrl)
 982 {
 983         struct gspca_dev *gspca_dev = priv;
 984         int i, ix;
 985         u32 id;
 986
 987         ix = -1;
 988         id = q_ctrl->id;
 989         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 990                 id &= V4L2_CTRL_ID_MASK;
 991                 id++;
 992                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 993                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 994                                 continue;
 995                         if (ix < 0) {
 996                                 ix = i;
 997                                 continue;
 998                         }
 999                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1000                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1001                                 continue;
1002                         ix = i;
1003                 }
1004         }
1005         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1006                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1007                         ix = i;
1008                         break;
1009                 }
1010         }
1011         if (ix < 0)
1012                 return -EINVAL;
1013         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1014                 sizeof *q_ctrl);
1015         if (gspca_dev->ctrl_dis & (1 << ix))
1016                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1017         return 0;
1018 }
1019
1020 static int vidioc_s_ctrl(struct file *file, void *priv,
1021                          struct v4l2_control *ctrl)
1022 {
1023         struct gspca_dev *gspca_dev = priv;
1024         const struct ctrl *ctrls;
1025         int i, ret;
1026
1027         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1028              i < gspca_dev->sd_desc->nctrls;
1029              i++, ctrls++) {
1030                 if (ctrl->id != ctrls->qctrl.id)
1031                         continue;
1032                 if (gspca_dev->ctrl_dis & (1 << i))
1033                         return -EINVAL;
1034                 if (ctrl->value < ctrls->qctrl.minimum
1035                     || ctrl->value > ctrls->qctrl.maximum)
1036                         return -ERANGE;
1037                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1038                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1039                         return -ERESTARTSYS;
1040                 ret = ctrls->set(gspca_dev, ctrl->value);
1041                 mutex_unlock(&gspca_dev->usb_lock);
1042                 return ret;
1043         }
1044         return -EINVAL;
1045 }
1046
1047 static int vidioc_g_ctrl(struct file *file, void *priv,
1048                          struct v4l2_control *ctrl)
1049 {
1050         struct gspca_dev *gspca_dev = priv;
1051
1052         const struct ctrl *ctrls;
1053         int i, ret;
1054
1055         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1056              i < gspca_dev->sd_desc->nctrls;
1057              i++, ctrls++) {
1058                 if (ctrl->id != ctrls->qctrl.id)
1059                         continue;
1060                 if (gspca_dev->ctrl_dis & (1 << i))
1061                         return -EINVAL;
1062                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1063                         return -ERESTARTSYS;
1064                 ret = ctrls->get(gspca_dev, &ctrl->value);
1065                 mutex_unlock(&gspca_dev->usb_lock);
1066                 return ret;
1067         }
1068         return -EINVAL;
1069 }
1070
1071 /*fixme: have an audio flag in gspca_dev?*/
1072 static int vidioc_s_audio(struct file *file, void *priv,
1073                          struct v4l2_audio *audio)
1074 {
1075         if (audio->index != 0)
1076                 return -EINVAL;
1077         return 0;
1078 }
1079
1080 static int vidioc_g_audio(struct file *file, void *priv,
1081                          struct v4l2_audio *audio)
1082 {
1083         memset(audio, 0, sizeof *audio);
1084         strcpy(audio->name, "Microphone");
1085         return 0;
1086 }
1087
1088 static int vidioc_enumaudio(struct file *file, void *priv,
1089                          struct v4l2_audio *audio)
1090 {
1091         if (audio->index != 0)
1092                 return -EINVAL;
1093
1094         strcpy(audio->name, "Microphone");
1095         audio->capability = 0;
1096         audio->mode = 0;
1097         return 0;
1098 }
1099
1100 static int vidioc_querymenu(struct file *file, void *priv,
1101                             struct v4l2_querymenu *qmenu)
1102 {
1103         struct gspca_dev *gspca_dev = priv;
1104
1105         if (!gspca_dev->sd_desc->querymenu)
1106                 return -EINVAL;
1107         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1108 }
1109
1110 static int vidioc_enum_input(struct file *file, void *priv,
1111                                 struct v4l2_input *input)
1112 {
1113         struct gspca_dev *gspca_dev = priv;
1114
1115         if (input->index != 0)
1116                 return -EINVAL;
1117         memset(input, 0, sizeof *input);
1118         input->type = V4L2_INPUT_TYPE_CAMERA;
1119         strncpy(input->name, gspca_dev->sd_desc->name,
1120                 sizeof input->name);
1121         return 0;
1122 }
1123
1124 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1125 {
1126         *i = 0;
1127         return 0;
1128 }
1129
1130 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1131 {
1132         if (i > 0)
1133                 return -EINVAL;
1134         return (0);
1135 }
1136
1137 static int vidioc_reqbufs(struct file *file, void *priv,
1138                           struct v4l2_requestbuffers *rb)
1139 {
1140         struct gspca_dev *gspca_dev = priv;
1141         int i, ret = 0;
1142
1143         switch (rb->memory) {
1144         case GSPCA_MEMORY_READ:                 /* (internal call) */
1145         case V4L2_MEMORY_MMAP:
1146         case V4L2_MEMORY_USERPTR:
1147                 break;
1148         default:
1149                 return -EINVAL;
1150         }
1151         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1152                 return -ERESTARTSYS;
1153
1154         if (gspca_dev->memory != GSPCA_MEMORY_NO
1155             && gspca_dev->memory != rb->memory) {
1156                 ret = -EBUSY;
1157                 goto out;
1158         }
1159
1160         /* only one file may do the capture */
1161         if (gspca_dev->capt_file != NULL
1162             && gspca_dev->capt_file != file) {
1163                 ret = -EBUSY;
1164                 goto out;
1165         }
1166
1167         /* if allocated, the buffers must not be mapped */
1168         for (i = 0; i < gspca_dev->nframes; i++) {
1169                 if (gspca_dev->frame[i].vma_use_count) {
1170                         ret = -EBUSY;
1171                         goto out;
1172                 }
1173         }
1174
1175         /* stop streaming */
1176         if (gspca_dev->streaming) {
1177                 mutex_lock(&gspca_dev->usb_lock);
1178                 gspca_stream_off(gspca_dev);
1179                 mutex_unlock(&gspca_dev->usb_lock);
1180         }
1181
1182         /* free the previous allocated buffers, if any */
1183         if (gspca_dev->nframes != 0) {
1184                 frame_free(gspca_dev);
1185                 gspca_dev->capt_file = NULL;
1186         }
1187         if (rb->count == 0)                     /* unrequest */
1188                 goto out;
1189         gspca_dev->memory = rb->memory;
1190         ret = frame_alloc(gspca_dev, rb->count);
1191         if (ret == 0) {
1192                 rb->count = gspca_dev->nframes;
1193                 gspca_dev->capt_file = file;
1194         }
1195 out:
1196         mutex_unlock(&gspca_dev->queue_lock);
1197         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1198         return ret;
1199 }
1200
1201 static int vidioc_querybuf(struct file *file, void *priv,
1202                            struct v4l2_buffer *v4l2_buf)
1203 {
1204         struct gspca_dev *gspca_dev = priv;
1205         struct gspca_frame *frame;
1206
1207         if (v4l2_buf->index < 0
1208             || v4l2_buf->index >= gspca_dev->nframes)
1209                 return -EINVAL;
1210
1211         frame = &gspca_dev->frame[v4l2_buf->index];
1212         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1213         return 0;
1214 }
1215
1216 static int vidioc_streamon(struct file *file, void *priv,
1217                            enum v4l2_buf_type buf_type)
1218 {
1219         struct gspca_dev *gspca_dev = priv;
1220         int ret;
1221
1222         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1223                 return -EINVAL;
1224         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1225                 return -ERESTARTSYS;
1226         if (!gspca_dev->present) {
1227                 ret = -ENODEV;
1228                 goto out;
1229         }
1230         if (gspca_dev->nframes == 0
1231             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1232                 ret = -EINVAL;
1233                 goto out;
1234         }
1235         if (!gspca_dev->streaming) {
1236                 ret = gspca_init_transfer(gspca_dev);
1237                 if (ret < 0)
1238                         goto out;
1239         }
1240 #ifdef GSPCA_DEBUG
1241         if (gspca_debug & D_STREAM) {
1242                 PDEBUG_MODE("stream on OK",
1243                         gspca_dev->pixfmt,
1244                         gspca_dev->width,
1245                         gspca_dev->height);
1246         }
1247 #endif
1248         ret = 0;
1249 out:
1250         mutex_unlock(&gspca_dev->queue_lock);
1251         return ret;
1252 }
1253
1254 static int vidioc_streamoff(struct file *file, void *priv,
1255                                 enum v4l2_buf_type buf_type)
1256 {
1257         struct gspca_dev *gspca_dev = priv;
1258         int i, ret;
1259
1260         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1261                 return -EINVAL;
1262         if (!gspca_dev->streaming)
1263                 return 0;
1264         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1265                 return -ERESTARTSYS;
1266
1267         /* stop streaming */
1268         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1269                 ret = -ERESTARTSYS;
1270                 goto out;
1271         }
1272         gspca_stream_off(gspca_dev);
1273         mutex_unlock(&gspca_dev->usb_lock);
1274
1275         /* empty the application queues */
1276         for (i = 0; i < gspca_dev->nframes; i++)
1277                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1278         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1279         gspca_dev->last_packet_type = DISCARD_PACKET;
1280         gspca_dev->sequence = 0;
1281         ret = 0;
1282 out:
1283         mutex_unlock(&gspca_dev->queue_lock);
1284         return ret;
1285 }
1286
1287 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1288                         struct v4l2_jpegcompression *jpegcomp)
1289 {
1290         struct gspca_dev *gspca_dev = priv;
1291         int ret;
1292
1293         if (!gspca_dev->sd_desc->get_jcomp)
1294                 return -EINVAL;
1295         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1296                 return -ERESTARTSYS;
1297         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1298         mutex_unlock(&gspca_dev->usb_lock);
1299         return ret;
1300 }
1301
1302 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1303                         struct v4l2_jpegcompression *jpegcomp)
1304 {
1305         struct gspca_dev *gspca_dev = priv;
1306         int ret;
1307
1308         if (!gspca_dev->sd_desc->set_jcomp)
1309                 return -EINVAL;
1310         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1311                 return -ERESTARTSYS;
1312         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1313         mutex_unlock(&gspca_dev->usb_lock);
1314         return ret;
1315 }
1316
1317 static int vidioc_g_parm(struct file *filp, void *priv,
1318                         struct v4l2_streamparm *parm)
1319 {
1320         struct gspca_dev *gspca_dev = priv;
1321
1322         memset(parm, 0, sizeof *parm);
1323         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1324         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1325
1326         if (gspca_dev->sd_desc->get_streamparm) {
1327                 int ret;
1328
1329                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1330                         return -ERESTARTSYS;
1331                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1332                 mutex_unlock(&gspca_dev->usb_lock);
1333                 return ret;
1334         }
1335
1336         return 0;
1337 }
1338
1339 static int vidioc_s_parm(struct file *filp, void *priv,
1340                         struct v4l2_streamparm *parm)
1341 {
1342         struct gspca_dev *gspca_dev = priv;
1343         int n;
1344
1345         n = parm->parm.capture.readbuffers;
1346         if (n == 0 || n > GSPCA_MAX_FRAMES)
1347                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1348         else
1349                 gspca_dev->nbufread = n;
1350
1351         if (gspca_dev->sd_desc->set_streamparm) {
1352                 int ret;
1353
1354                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1355                         return -ERESTARTSYS;
1356                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1357                 mutex_unlock(&gspca_dev->usb_lock);
1358                 return ret;
1359         }
1360
1361         return 0;
1362 }
1363
1364 static int vidioc_s_std(struct file *filp, void *priv,
1365                         v4l2_std_id *parm)
1366 {
1367         return 0;
1368 }
1369
1370 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1371 static int vidiocgmbuf(struct file *file, void *priv,
1372                         struct video_mbuf *mbuf)
1373 {
1374         struct gspca_dev *gspca_dev = file->private_data;
1375         int i;
1376
1377         PDEBUG(D_STREAM, "cgmbuf");
1378         if (gspca_dev->nframes == 0) {
1379                 int ret;
1380
1381                 {
1382                         struct v4l2_format fmt;
1383
1384                         memset(&fmt, 0, sizeof fmt);
1385                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1386                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1387                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1388                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1389                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1390                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1391                         if (ret != 0)
1392                                 return ret;
1393                 }
1394                 {
1395                         struct v4l2_requestbuffers rb;
1396
1397                         memset(&rb, 0, sizeof rb);
1398                         rb.count = 4;
1399                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1400                         rb.memory = V4L2_MEMORY_MMAP;
1401                         ret = vidioc_reqbufs(file, priv, &rb);
1402                         if (ret != 0)
1403                                 return ret;
1404                 }
1405         }
1406         mbuf->frames = gspca_dev->nframes;
1407         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1408         for (i = 0; i < mbuf->frames; i++)
1409                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1410         return 0;
1411 }
1412 #endif
1413
1414 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1415 {
1416         struct gspca_dev *gspca_dev = file->private_data;
1417         struct gspca_frame *frame;
1418         struct page *page;
1419         unsigned long addr, start, size;
1420         int i, ret;
1421
1422         start = vma->vm_start;
1423         size = vma->vm_end - vma->vm_start;
1424         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1425
1426         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1427                 return -ERESTARTSYS;
1428         if (!gspca_dev->present) {
1429                 ret = -ENODEV;
1430                 goto out;
1431         }
1432         if (gspca_dev->capt_file != file) {
1433                 ret = -EINVAL;
1434                 goto out;
1435         }
1436
1437         frame = NULL;
1438         for (i = 0; i < gspca_dev->nframes; ++i) {
1439                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1440                         PDEBUG(D_STREAM, "mmap bad memory type");
1441                         break;
1442                 }
1443                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1444                                                 == vma->vm_pgoff) {
1445                         frame = &gspca_dev->frame[i];
1446                         break;
1447                 }
1448         }
1449         if (frame == NULL) {
1450                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1451                 ret = -EINVAL;
1452                 goto out;
1453         }
1454 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1455         /* v4l1 maps all the buffers */
1456         if (i != 0
1457             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1458 #endif
1459             if (size != frame->v4l2_buf.length) {
1460                 PDEBUG(D_STREAM, "mmap bad size");
1461                 ret = -EINVAL;
1462                 goto out;
1463         }
1464
1465         /*
1466          * - VM_IO marks the area as being a mmaped region for I/O to a
1467          *   device. It also prevents the region from being core dumped.
1468          */
1469         vma->vm_flags |= VM_IO;
1470
1471         addr = (unsigned long) frame->data;
1472         while (size > 0) {
1473                 page = vmalloc_to_page((void *) addr);
1474                 ret = vm_insert_page(vma, start, page);
1475                 if (ret < 0)
1476                         goto out;
1477                 start += PAGE_SIZE;
1478                 addr += PAGE_SIZE;
1479                 size -= PAGE_SIZE;
1480         }
1481
1482         vma->vm_ops = &gspca_vm_ops;
1483         vma->vm_private_data = frame;
1484         gspca_vm_open(vma);
1485         ret = 0;
1486 out:
1487         mutex_unlock(&gspca_dev->queue_lock);
1488         return ret;
1489 }
1490
1491 /*
1492  * wait for a video frame
1493  *
1494  * If a frame is ready, its index is returned.
1495  */
1496 static int frame_wait(struct gspca_dev *gspca_dev,
1497                         int nonblock_ing)
1498 {
1499         struct gspca_frame *frame;
1500         int i, j, ret;
1501
1502         /* check if a frame is ready */
1503         i = gspca_dev->fr_o;
1504         j = gspca_dev->fr_queue[i];
1505         frame = &gspca_dev->frame[j];
1506
1507         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1508                 if (nonblock_ing)
1509                         return -EAGAIN;
1510
1511                 /* wait till a frame is ready */
1512                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1513                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1514                         !gspca_dev->streaming || !gspca_dev->present,
1515                         msecs_to_jiffies(3000));
1516                 if (ret < 0)
1517                         return ret;
1518                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1519                         return -EIO;
1520         }
1521
1522         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1523         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1524                 gspca_dev->fr_q,
1525                 gspca_dev->fr_i,
1526                 gspca_dev->fr_o);
1527
1528         if (gspca_dev->sd_desc->dq_callback) {
1529                 mutex_lock(&gspca_dev->usb_lock);
1530                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1531                 mutex_unlock(&gspca_dev->usb_lock);
1532         }
1533         return j;
1534 }
1535
1536 /*
1537  * dequeue a video buffer
1538  *
1539  * If nonblock_ing is false, block until a buffer is available.
1540  */
1541 static int vidioc_dqbuf(struct file *file, void *priv,
1542                         struct v4l2_buffer *v4l2_buf)
1543 {
1544         struct gspca_dev *gspca_dev = priv;
1545         struct gspca_frame *frame;
1546         int i, ret;
1547
1548         PDEBUG(D_FRAM, "dqbuf");
1549         if (v4l2_buf->memory != gspca_dev->memory)
1550                 return -EINVAL;
1551
1552         /* if not streaming, be sure the application will not loop forever */
1553         if (!(file->f_flags & O_NONBLOCK)
1554             && !gspca_dev->streaming && gspca_dev->users == 1)
1555                 return -EINVAL;
1556
1557         /* only the capturing file may dequeue */
1558         if (gspca_dev->capt_file != file)
1559                 return -EINVAL;
1560
1561         /* only one dequeue / read at a time */
1562         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1563                 return -ERESTARTSYS;
1564
1565         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1566         if (ret < 0)
1567                 goto out;
1568         i = ret;                                /* frame index */
1569         frame = &gspca_dev->frame[i];
1570         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1571                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1572                                  frame->data,
1573                                  frame->v4l2_buf.bytesused)) {
1574                         PDEBUG(D_ERR|D_STREAM,
1575                                 "dqbuf cp to user failed");
1576                         ret = -EFAULT;
1577                         goto out;
1578                 }
1579         }
1580         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1581         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1582         PDEBUG(D_FRAM, "dqbuf %d", i);
1583         ret = 0;
1584 out:
1585         mutex_unlock(&gspca_dev->read_lock);
1586         return ret;
1587 }
1588
1589 /*
1590  * queue a video buffer
1591  *
1592  * Attempting to queue a buffer that has already been
1593  * queued will return -EINVAL.
1594  */
1595 static int vidioc_qbuf(struct file *file, void *priv,
1596                         struct v4l2_buffer *v4l2_buf)
1597 {
1598         struct gspca_dev *gspca_dev = priv;
1599         struct gspca_frame *frame;
1600         int i, index, ret;
1601
1602         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1603
1604         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1605                 return -ERESTARTSYS;
1606
1607         index = v4l2_buf->index;
1608         if ((unsigned) index >= gspca_dev->nframes) {
1609                 PDEBUG(D_FRAM,
1610                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1611                 ret = -EINVAL;
1612                 goto out;
1613         }
1614         if (v4l2_buf->memory != gspca_dev->memory) {
1615                 PDEBUG(D_FRAM, "qbuf bad memory type");
1616                 ret = -EINVAL;
1617                 goto out;
1618         }
1619
1620         frame = &gspca_dev->frame[index];
1621         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1622                 PDEBUG(D_FRAM, "qbuf bad state");
1623                 ret = -EINVAL;
1624                 goto out;
1625         }
1626
1627         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1628
1629         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1630                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1631                 frame->v4l2_buf.length = v4l2_buf->length;
1632         }
1633
1634         /* put the buffer in the 'queued' queue */
1635         i = gspca_dev->fr_q;
1636         gspca_dev->fr_queue[i] = index;
1637         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1638         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1639                 gspca_dev->fr_q,
1640                 gspca_dev->fr_i,
1641                 gspca_dev->fr_o);
1642
1643         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1644         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1645         ret = 0;
1646 out:
1647         mutex_unlock(&gspca_dev->queue_lock);
1648         return ret;
1649 }
1650
1651 /*
1652  * allocate the resources for read()
1653  */
1654 static int read_alloc(struct gspca_dev *gspca_dev,
1655                         struct file *file)
1656 {
1657         struct v4l2_buffer v4l2_buf;
1658         int i, ret;
1659
1660         PDEBUG(D_STREAM, "read alloc");
1661         if (gspca_dev->nframes == 0) {
1662                 struct v4l2_requestbuffers rb;
1663
1664                 memset(&rb, 0, sizeof rb);
1665                 rb.count = gspca_dev->nbufread;
1666                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1667                 rb.memory = GSPCA_MEMORY_READ;
1668                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1669                 if (ret != 0) {
1670                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1671                         return ret;
1672                 }
1673                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1674                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1675                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1676                 for (i = 0; i < gspca_dev->nbufread; i++) {
1677                         v4l2_buf.index = i;
1678                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1679                         if (ret != 0) {
1680                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1681                                 return ret;
1682                         }
1683                 }
1684                 gspca_dev->memory = GSPCA_MEMORY_READ;
1685         }
1686
1687         /* start streaming */
1688         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1689         if (ret != 0)
1690                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1691         return ret;
1692 }
1693
1694 static unsigned int dev_poll(struct file *file, poll_table *wait)
1695 {
1696         struct gspca_dev *gspca_dev = file->private_data;
1697         int i, ret;
1698
1699         PDEBUG(D_FRAM, "poll");
1700
1701         poll_wait(file, &gspca_dev->wq, wait);
1702         if (!gspca_dev->present)
1703                 return POLLERR;
1704
1705         /* if reqbufs is not done, the user would use read() */
1706         if (gspca_dev->nframes == 0) {
1707                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1708                         return POLLERR;         /* not the 1st time */
1709                 ret = read_alloc(gspca_dev, file);
1710                 if (ret != 0)
1711                         return POLLERR;
1712         }
1713
1714         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1715                 return POLLERR;
1716         if (!gspca_dev->present) {
1717                 ret = POLLERR;
1718                 goto out;
1719         }
1720
1721         /* check the next incoming buffer */
1722         i = gspca_dev->fr_o;
1723         i = gspca_dev->fr_queue[i];
1724         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1725                 ret = POLLIN | POLLRDNORM;      /* something to read */
1726         else
1727                 ret = 0;
1728 out:
1729         mutex_unlock(&gspca_dev->queue_lock);
1730         return ret;
1731 }
1732
1733 static ssize_t dev_read(struct file *file, char __user *data,
1734                     size_t count, loff_t *ppos)
1735 {
1736         struct gspca_dev *gspca_dev = file->private_data;
1737         struct gspca_frame *frame;
1738         struct v4l2_buffer v4l2_buf;
1739         struct timeval timestamp;
1740         int n, ret, ret2;
1741
1742         PDEBUG(D_FRAM, "read (%zd)", count);
1743         if (!gspca_dev->present)
1744                 return -ENODEV;
1745         switch (gspca_dev->memory) {
1746         case GSPCA_MEMORY_NO:                   /* first time */
1747                 ret = read_alloc(gspca_dev, file);
1748                 if (ret != 0)
1749                         return ret;
1750                 break;
1751         case GSPCA_MEMORY_READ:
1752                 if (gspca_dev->capt_file == file)
1753                         break;
1754                 /* fall thru */
1755         default:
1756                 return -EINVAL;
1757         }
1758
1759         /* get a frame */
1760         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1761         timestamp.tv_sec--;
1762         n = 2;
1763         for (;;) {
1764                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1765                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1766                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1767                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1768                 if (ret != 0) {
1769                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1770                         return ret;
1771                 }
1772
1773                 /* if the process slept for more than 1 second,
1774                  * get a newer frame */
1775                 frame = &gspca_dev->frame[v4l2_buf.index];
1776                 if (--n < 0)
1777                         break;                  /* avoid infinite loop */
1778                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1779                         break;
1780                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1781                 if (ret != 0) {
1782                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1783                         return ret;
1784                 }
1785         }
1786
1787         /* copy the frame */
1788         if (count > frame->v4l2_buf.bytesused)
1789                 count = frame->v4l2_buf.bytesused;
1790         ret = copy_to_user(data, frame->data, count);
1791         if (ret != 0) {
1792                 PDEBUG(D_ERR|D_STREAM,
1793                         "read cp to user lack %d / %zd", ret, count);
1794                 ret = -EFAULT;
1795                 goto out;
1796         }
1797         ret = count;
1798 out:
1799         /* in each case, requeue the buffer */
1800         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1801         if (ret2 != 0)
1802                 return ret2;
1803         return ret;
1804 }
1805
1806 static struct v4l2_file_operations dev_fops = {
1807         .owner = THIS_MODULE,
1808         .open = dev_open,
1809         .release = dev_close,
1810         .read = dev_read,
1811         .mmap = dev_mmap,
1812         .unlocked_ioctl = video_ioctl2,
1813         .poll   = dev_poll,
1814 };
1815
1816 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1817         .vidioc_querycap        = vidioc_querycap,
1818         .vidioc_dqbuf           = vidioc_dqbuf,
1819         .vidioc_qbuf            = vidioc_qbuf,
1820         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1821         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1822         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1823         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1824         .vidioc_streamon        = vidioc_streamon,
1825         .vidioc_queryctrl       = vidioc_queryctrl,
1826         .vidioc_g_ctrl          = vidioc_g_ctrl,
1827         .vidioc_s_ctrl          = vidioc_s_ctrl,
1828         .vidioc_g_audio         = vidioc_g_audio,
1829         .vidioc_s_audio         = vidioc_s_audio,
1830         .vidioc_enumaudio       = vidioc_enumaudio,
1831         .vidioc_querymenu       = vidioc_querymenu,
1832         .vidioc_enum_input      = vidioc_enum_input,
1833         .vidioc_g_input         = vidioc_g_input,
1834         .vidioc_s_input         = vidioc_s_input,
1835         .vidioc_reqbufs         = vidioc_reqbufs,
1836         .vidioc_querybuf        = vidioc_querybuf,
1837         .vidioc_streamoff       = vidioc_streamoff,
1838         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1839         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1840         .vidioc_g_parm          = vidioc_g_parm,
1841         .vidioc_s_parm          = vidioc_s_parm,
1842         .vidioc_s_std           = vidioc_s_std,
1843 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1844         .vidiocgmbuf          = vidiocgmbuf,
1845 #endif
1846 };
1847
1848 static struct video_device gspca_template = {
1849         .name = "gspca main driver",
1850         .fops = &dev_fops,
1851         .ioctl_ops = &dev_ioctl_ops,
1852         .release = gspca_release,
1853         .minor = -1,
1854 };
1855
1856 /*
1857  * probe and create a new gspca device
1858  *
1859  * This function must be called by the sub-driver when it is
1860  * called for probing a new device.
1861  */
1862 int gspca_dev_probe(struct usb_interface *intf,
1863                 const struct usb_device_id *id,
1864                 const struct sd_desc *sd_desc,
1865                 int dev_size,
1866                 struct module *module)
1867 {
1868         struct usb_interface_descriptor *interface;
1869         struct gspca_dev *gspca_dev;
1870         struct usb_device *dev = interface_to_usbdev(intf);
1871         int ret;
1872
1873         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1874
1875         /* we don't handle multi-config cameras */
1876         if (dev->descriptor.bNumConfigurations != 1)
1877                 return -ENODEV;
1878         interface = &intf->cur_altsetting->desc;
1879         if (interface->bInterfaceNumber > 0)
1880                 return -ENODEV;
1881
1882         /* create the device */
1883         if (dev_size < sizeof *gspca_dev)
1884                 dev_size = sizeof *gspca_dev;
1885         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1886         if (!gspca_dev) {
1887                 err("couldn't kzalloc gspca struct");
1888                 return -ENOMEM;
1889         }
1890         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1891         if (!gspca_dev->usb_buf) {
1892                 err("out of memory");
1893                 ret = -ENOMEM;
1894                 goto out;
1895         }
1896         gspca_dev->dev = dev;
1897         gspca_dev->iface = interface->bInterfaceNumber;
1898         gspca_dev->nbalt = intf->num_altsetting;
1899         gspca_dev->sd_desc = sd_desc;
1900         gspca_dev->nbufread = 2;
1901         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1902
1903         /* configure the subdriver and initialize the USB device */
1904         ret = sd_desc->config(gspca_dev, id);
1905         if (ret < 0)
1906                 goto out;
1907         ret = sd_desc->init(gspca_dev);
1908         if (ret < 0)
1909                 goto out;
1910         ret = gspca_set_alt0(gspca_dev);
1911         if (ret < 0)
1912                 goto out;
1913         gspca_set_default_mode(gspca_dev);
1914
1915         mutex_init(&gspca_dev->usb_lock);
1916         mutex_init(&gspca_dev->read_lock);
1917         mutex_init(&gspca_dev->queue_lock);
1918         init_waitqueue_head(&gspca_dev->wq);
1919
1920         /* init video stuff */
1921         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1922         gspca_dev->vdev.parent = &dev->dev;
1923         gspca_dev->module = module;
1924         gspca_dev->present = 1;
1925         ret = video_register_device(&gspca_dev->vdev,
1926                                   VFL_TYPE_GRABBER,
1927                                   video_nr);
1928         if (ret < 0) {
1929                 err("video_register_device err %d", ret);
1930                 goto out;
1931         }
1932
1933         usb_set_intfdata(intf, gspca_dev);
1934         PDEBUG(D_PROBE, "probe ok");
1935         return 0;
1936 out:
1937         kfree(gspca_dev->usb_buf);
1938         kfree(gspca_dev);
1939         return ret;
1940 }
1941 EXPORT_SYMBOL(gspca_dev_probe);
1942
1943 /*
1944  * USB disconnection
1945  *
1946  * This function must be called by the sub-driver
1947  * when the device disconnects, after the specific resources are freed.
1948  */
1949 void gspca_disconnect(struct usb_interface *intf)
1950 {
1951         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1952
1953         gspca_dev->present = 0;
1954
1955         usb_set_intfdata(intf, NULL);
1956
1957         /* release the device */
1958         /* (this will call gspca_release() immediatly or on last close) */
1959         video_unregister_device(&gspca_dev->vdev);
1960
1961         PDEBUG(D_PROBE, "disconnect complete");
1962 }
1963 EXPORT_SYMBOL(gspca_disconnect);
1964
1965 #ifdef CONFIG_PM
1966 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1967 {
1968         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1969
1970         if (!gspca_dev->streaming)
1971                 return 0;
1972         gspca_dev->frozen = 1;          /* avoid urb error messages */
1973         if (gspca_dev->sd_desc->stopN)
1974                 gspca_dev->sd_desc->stopN(gspca_dev);
1975         destroy_urbs(gspca_dev);
1976         gspca_set_alt0(gspca_dev);
1977         if (gspca_dev->sd_desc->stop0)
1978                 gspca_dev->sd_desc->stop0(gspca_dev);
1979         return 0;
1980 }
1981 EXPORT_SYMBOL(gspca_suspend);
1982
1983 int gspca_resume(struct usb_interface *intf)
1984 {
1985         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1986
1987         gspca_dev->frozen = 0;
1988         gspca_dev->sd_desc->init(gspca_dev);
1989         if (gspca_dev->streaming)
1990                 return gspca_init_transfer(gspca_dev);
1991         return 0;
1992 }
1993 EXPORT_SYMBOL(gspca_resume);
1994 #endif
1995 /* -- cam driver utility functions -- */
1996
1997 /* auto gain and exposure algorithm based on the knee algorithm described here:
1998    http://ytse.tricolour.net/docs/LowLightOptimization.html
1999
2000    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2001    where changed. */
2002 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2003         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2004 {
2005         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2006         const struct ctrl *gain_ctrl = NULL;
2007         const struct ctrl *exposure_ctrl = NULL;
2008         const struct ctrl *autogain_ctrl = NULL;
2009         int retval = 0;
2010
2011         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2012                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2013                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2015                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2016                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2017                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2018         }
2019         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2020                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2021                         "on cam without (auto)gain/exposure");
2022                 return 0;
2023         }
2024
2025         if (gain_ctrl->get(gspca_dev, &gain) ||
2026                         exposure_ctrl->get(gspca_dev, &exposure) ||
2027                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2028                 return 0;
2029
2030         orig_gain = gain;
2031         orig_exposure = exposure;
2032
2033         /* If we are of a multiple of deadzone, do multiple steps to reach the
2034            desired lumination fast (with the risc of a slight overshoot) */
2035         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2036
2037         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2038                 avg_lum, desired_avg_lum, steps);
2039
2040         for (i = 0; i < steps; i++) {
2041                 if (avg_lum > desired_avg_lum) {
2042                         if (gain > gain_knee)
2043                                 gain--;
2044                         else if (exposure > exposure_knee)
2045                                 exposure--;
2046                         else if (gain > gain_ctrl->qctrl.default_value)
2047                                 gain--;
2048                         else if (exposure > exposure_ctrl->qctrl.minimum)
2049                                 exposure--;
2050                         else if (gain > gain_ctrl->qctrl.minimum)
2051                                 gain--;
2052                         else
2053                                 break;
2054                 } else {
2055                         if (gain < gain_ctrl->qctrl.default_value)
2056                                 gain++;
2057                         else if (exposure < exposure_knee)
2058                                 exposure++;
2059                         else if (gain < gain_knee)
2060                                 gain++;
2061                         else if (exposure < exposure_ctrl->qctrl.maximum)
2062                                 exposure++;
2063                         else if (gain < gain_ctrl->qctrl.maximum)
2064                                 gain++;
2065                         else
2066                                 break;
2067                 }
2068         }
2069
2070         if (gain != orig_gain) {
2071                 gain_ctrl->set(gspca_dev, gain);
2072                 retval = 1;
2073         }
2074         if (exposure != orig_exposure) {
2075                 exposure_ctrl->set(gspca_dev, exposure);
2076                 retval = 1;
2077         }
2078
2079         return retval;
2080 }
2081 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2082
2083 /* -- module insert / remove -- */
2084 static int __init gspca_init(void)
2085 {
2086         info("main v%d.%d.%d registered",
2087                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2088                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2089                 DRIVER_VERSION_NUMBER & 0xff);
2090         return 0;
2091 }
2092 static void __exit gspca_exit(void)
2093 {
2094         info("main deregistered");
2095 }
2096
2097 module_init(gspca_init);
2098 module_exit(gspca_exit);
2099
2100 #ifdef GSPCA_DEBUG
2101 module_param_named(debug, gspca_debug, int, 0644);
2102 MODULE_PARM_DESC(debug,
2103                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2104                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2105                 " 0x0100: v4l2");
2106 #endif