git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2009 Jean-Francois Moine (http://moinejf.free.fr)
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/version.h>
  25 #include <linux/fs.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/string.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/io.h>
  33 #include <asm/page.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/jiffies.h>
  36 #include <media/v4l2-ioctl.h>
  37
  38 #include "gspca.h"
  39
  40 /* global values */
  41 #define DEF_NURBS 3             /* default number of URBs */
  42 #if DEF_NURBS > MAX_NURBS
  43 #error "DEF_NURBS too big"
  44 #endif
  45
  46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 6, 0)
  51
  52 #ifdef GSPCA_DEBUG
  53 int gspca_debug = D_ERR | D_PROBE;
  54 EXPORT_SYMBOL(gspca_debug);
  55
  56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  57 {
  58         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  59                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  60                         txt,
  61                         pixfmt & 0xff,
  62                         (pixfmt >> 8) & 0xff,
  63                         (pixfmt >> 16) & 0xff,
  64                         pixfmt >> 24,
  65                         w, h);
  66         } else {
  67                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  68                         txt,
  69                         pixfmt,
  70                         w, h);
  71         }
  72 }
  73 #else
  74 #define PDEBUG_MODE(txt, pixfmt, w, h)
  75 #endif
  76
  77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  78 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  79 #define GSPCA_MEMORY_READ 7
  80
  81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  82
  83 /*
  84  * VMA operations.
  85  */
  86 static void gspca_vm_open(struct vm_area_struct *vma)
  87 {
  88         struct gspca_frame *frame = vma->vm_private_data;
  89
  90         frame->vma_use_count++;
  91         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  92 }
  93
  94 static void gspca_vm_close(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         if (--frame->vma_use_count <= 0)
  99                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static struct vm_operations_struct gspca_vm_ops = {
 103         .open           = gspca_vm_open,
 104         .close          = gspca_vm_close,
 105 };
 106
 107 /* get the current input frame buffer */
 108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 109 {
 110         struct gspca_frame *frame;
 111         int i;
 112
 113         i = gspca_dev->fr_i;
 114         i = gspca_dev->fr_queue[i];
 115         frame = &gspca_dev->frame[i];
 116         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 117                                 != V4L2_BUF_FLAG_QUEUED)
 118                 return NULL;
 119         return frame;
 120 }
 121 EXPORT_SYMBOL(gspca_get_i_frame);
 122
 123 /*
 124  * fill a video frame from an URB and resubmit
 125  */
 126 static void fill_frame(struct gspca_dev *gspca_dev,
 127                         struct urb *urb)
 128 {
 129         struct gspca_frame *frame;
 130         u8 *data;               /* address of data in the iso message */
 131         int i, len, st;
 132         cam_pkt_op pkt_scan;
 133
 134         if (urb->status != 0) {
 135                 if (urb->status == -ESHUTDOWN)
 136                         return;         /* disconnection */
 137 #ifdef CONFIG_PM
 138                 if (!gspca_dev->frozen)
 139 #endif
 140                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 141                 return;
 142         }
 143         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 144         for (i = 0; i < urb->number_of_packets; i++) {
 145
 146                 /* check the availability of the frame buffer */
 147                 frame = gspca_get_i_frame(gspca_dev);
 148                 if (!frame) {
 149                         gspca_dev->last_packet_type = DISCARD_PACKET;
 150                         break;
 151                 }
 152
 153                 /* check the packet status and length */
 154                 len = urb->iso_frame_desc[i].actual_length;
 155                 if (len == 0) {
 156                         if (gspca_dev->empty_packet == 0)
 157                                 gspca_dev->empty_packet = 1;
 158                         continue;
 159                 }
 160                 st = urb->iso_frame_desc[i].status;
 161                 if (st) {
 162                         PDEBUG(D_ERR,
 163                                 "ISOC data error: [%d] len=%d, status=%d",
 164                                 i, len, st);
 165                         gspca_dev->last_packet_type = DISCARD_PACKET;
 166                         continue;
 167                 }
 168
 169                 /* let the packet be analyzed by the subdriver */
 170                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 171                         i, urb->iso_frame_desc[i].offset, len);
 172                 data = (u8 *) urb->transfer_buffer
 173                                         + urb->iso_frame_desc[i].offset;
 174                 pkt_scan(gspca_dev, frame, data, len);
 175         }
 176
 177         /* resubmit the URB */
 178         st = usb_submit_urb(urb, GFP_ATOMIC);
 179         if (st < 0)
 180                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 181 }
 182
 183 /*
 184  * ISOC message interrupt from the USB device
 185  *
 186  * Analyse each packet and call the subdriver for copy to the frame buffer.
 187  */
 188 static void isoc_irq(struct urb *urb)
 189 {
 190         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 191
 192         PDEBUG(D_PACK, "isoc irq");
 193         if (!gspca_dev->streaming)
 194                 return;
 195         fill_frame(gspca_dev, urb);
 196 }
 197
 198 /*
 199  * bulk message interrupt from the USB device
 200  */
 201 static void bulk_irq(struct urb *urb)
 202 {
 203         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 204         struct gspca_frame *frame;
 205         int st;
 206
 207         PDEBUG(D_PACK, "bulk irq");
 208         if (!gspca_dev->streaming)
 209                 return;
 210         switch (urb->status) {
 211         case 0:
 212                 break;
 213         case -ESHUTDOWN:
 214                 return;         /* disconnection */
 215         case -ECONNRESET:
 216                 urb->status = 0;
 217                 break;
 218         default:
 219 #ifdef CONFIG_PM
 220                 if (!gspca_dev->frozen)
 221 #endif
 222                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 223                 return;
 224         }
 225
 226         /* check the availability of the frame buffer */
 227         frame = gspca_get_i_frame(gspca_dev);
 228         if (!frame) {
 229                 gspca_dev->last_packet_type = DISCARD_PACKET;
 230         } else {
 231                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 232                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 233                                         frame,
 234                                         urb->transfer_buffer,
 235                                         urb->actual_length);
 236         }
 237
 238         /* resubmit the URB */
 239         if (gspca_dev->cam.bulk_nurbs != 0) {
 240                 st = usb_submit_urb(urb, GFP_ATOMIC);
 241                 if (st < 0)
 242                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 243         }
 244 }
 245
 246 /*
 247  * add data to the current frame
 248  *
 249  * This function is called by the subdrivers at interrupt level.
 250  *
 251  * To build a frame, these ones must add
 252  *      - one FIRST_PACKET
 253  *      - 0 or many INTER_PACKETs
 254  *      - one LAST_PACKET
 255  * DISCARD_PACKET invalidates the whole frame.
 256  * On LAST_PACKET, a new frame is returned.
 257  */
 258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 259                                     enum gspca_packet_type packet_type,
 260                                     struct gspca_frame *frame,
 261                                     const __u8 *data,
 262                                     int len)
 263 {
 264         int i, j;
 265
 266         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 267
 268         /* when start of a new frame, if the current frame buffer
 269          * is not queued, discard the whole frame */
 270         if (packet_type == FIRST_PACKET) {
 271                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 272                                                 != V4L2_BUF_FLAG_QUEUED) {
 273                         gspca_dev->last_packet_type = DISCARD_PACKET;
 274                         return frame;
 275                 }
 276                 frame->data_end = frame->data;
 277                 jiffies_to_timeval(get_jiffies_64(),
 278                                    &frame->v4l2_buf.timestamp);
 279                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 280         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 281                 if (packet_type == LAST_PACKET)
 282                         gspca_dev->last_packet_type = packet_type;
 283                 return frame;
 284         }
 285
 286         /* append the packet to the frame buffer */
 287         if (len > 0) {
 288                 if (frame->data_end - frame->data + len
 289                                                  > frame->v4l2_buf.length) {
 290                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 291                                 frame->data_end - frame->data + len,
 292                                 frame->v4l2_buf.length);
 293                         packet_type = DISCARD_PACKET;
 294                 } else {
 295                         memcpy(frame->data_end, data, len);
 296                         frame->data_end += len;
 297                 }
 298         }
 299         gspca_dev->last_packet_type = packet_type;
 300
 301         /* if last packet, wake up the application and advance in the queue */
 302         if (packet_type == LAST_PACKET) {
 303                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 304                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 305                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 306                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 307                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 308                 gspca_dev->fr_i = i;
 309                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 310                         frame->v4l2_buf.bytesused,
 311                         gspca_dev->fr_q,
 312                         i,
 313                         gspca_dev->fr_o);
 314                 j = gspca_dev->fr_queue[i];
 315                 frame = &gspca_dev->frame[j];
 316         }
 317         return frame;
 318 }
 319 EXPORT_SYMBOL(gspca_frame_add);
 320
 321 static int gspca_is_compressed(__u32 format)
 322 {
 323         switch (format) {
 324         case V4L2_PIX_FMT_MJPEG:
 325         case V4L2_PIX_FMT_JPEG:
 326         case V4L2_PIX_FMT_SPCA561:
 327         case V4L2_PIX_FMT_PAC207:
 328         case V4L2_PIX_FMT_MR97310A:
 329                 return 1;
 330         }
 331         return 0;
 332 }
 333
 334 static void *rvmalloc(unsigned long size)
 335 {
 336         void *mem;
 337         unsigned long adr;
 338
 339         mem = vmalloc_32(size);
 340         if (mem != NULL) {
 341                 adr = (unsigned long) mem;
 342                 while ((long) size > 0) {
 343                         SetPageReserved(vmalloc_to_page((void *) adr));
 344                         adr += PAGE_SIZE;
 345                         size -= PAGE_SIZE;
 346                 }
 347         }
 348         return mem;
 349 }
 350
 351 static void rvfree(void *mem, long size)
 352 {
 353         unsigned long adr;
 354
 355         adr = (unsigned long) mem;
 356         while (size > 0) {
 357                 ClearPageReserved(vmalloc_to_page((void *) adr));
 358                 adr += PAGE_SIZE;
 359                 size -= PAGE_SIZE;
 360         }
 361         vfree(mem);
 362 }
 363
 364 static int frame_alloc(struct gspca_dev *gspca_dev,
 365                         unsigned int count)
 366 {
 367         struct gspca_frame *frame;
 368         unsigned int frsz;
 369         int i;
 370
 371         i = gspca_dev->curr_mode;
 372         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 373         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 374         frsz = PAGE_ALIGN(frsz);
 375         gspca_dev->frsz = frsz;
 376         if (count > GSPCA_MAX_FRAMES)
 377                 count = GSPCA_MAX_FRAMES;
 378         gspca_dev->frbuf = rvmalloc(frsz * count);
 379         if (!gspca_dev->frbuf) {
 380                 err("frame alloc failed");
 381                 return -ENOMEM;
 382         }
 383         gspca_dev->nframes = count;
 384         for (i = 0; i < count; i++) {
 385                 frame = &gspca_dev->frame[i];
 386                 frame->v4l2_buf.index = i;
 387                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 388                 frame->v4l2_buf.flags = 0;
 389                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 390                 frame->v4l2_buf.length = frsz;
 391                 frame->v4l2_buf.memory = gspca_dev->memory;
 392                 frame->v4l2_buf.sequence = 0;
 393                 frame->data = frame->data_end =
 394                                         gspca_dev->frbuf + i * frsz;
 395                 frame->v4l2_buf.m.offset = i * frsz;
 396         }
 397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 398         gspca_dev->last_packet_type = DISCARD_PACKET;
 399         gspca_dev->sequence = 0;
 400         return 0;
 401 }
 402
 403 static void frame_free(struct gspca_dev *gspca_dev)
 404 {
 405         int i;
 406
 407         PDEBUG(D_STREAM, "frame free");
 408         if (gspca_dev->frbuf != NULL) {
 409                 rvfree(gspca_dev->frbuf,
 410                         gspca_dev->nframes * gspca_dev->frsz);
 411                 gspca_dev->frbuf = NULL;
 412                 for (i = 0; i < gspca_dev->nframes; i++)
 413                         gspca_dev->frame[i].data = NULL;
 414         }
 415         gspca_dev->nframes = 0;
 416 }
 417
 418 static void destroy_urbs(struct gspca_dev *gspca_dev)
 419 {
 420         struct urb *urb;
 421         unsigned int i;
 422
 423         PDEBUG(D_STREAM, "kill transfer");
 424         for (i = 0; i < MAX_NURBS; i++) {
 425                 urb = gspca_dev->urb[i];
 426                 if (urb == NULL)
 427                         break;
 428
 429                 gspca_dev->urb[i] = NULL;
 430                 usb_kill_urb(urb);
 431                 if (urb->transfer_buffer != NULL)
 432                         usb_buffer_free(gspca_dev->dev,
 433                                         urb->transfer_buffer_length,
 434                                         urb->transfer_buffer,
 435                                         urb->transfer_dma);
 436                 usb_free_urb(urb);
 437         }
 438 }
 439
 440 /*
 441  * look for an input transfer endpoint in an alternate setting
 442  */
 443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 444                                           int xfer)
 445 {
 446         struct usb_host_endpoint *ep;
 447         int i, attr;
 448
 449         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 450                 ep = &alt->endpoint[i];
 451                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 452                 if (attr == xfer
 453                     && ep->desc.wMaxPacketSize != 0)
 454                         return ep;
 455         }
 456         return NULL;
 457 }
 458
 459 /*
 460  * look for an input (isoc or bulk) endpoint
 461  *
 462  * The endpoint is defined by the subdriver.
 463  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 464  * This routine may be called many times when the bandwidth is too small
 465  * (the bandwidth is checked on urb submit).
 466  */
 467 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 468 {
 469         struct usb_interface *intf;
 470         struct usb_host_endpoint *ep;
 471         int xfer, i, ret;
 472
 473         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 474         ep = NULL;
 475         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 476                                    : USB_ENDPOINT_XFER_ISOC;
 477         i = gspca_dev->alt;                     /* previous alt setting */
 478         while (--i >= 0) {
 479                 ep = alt_xfer(&intf->altsetting[i], xfer);
 480                 if (ep)
 481                         break;
 482         }
 483         if (ep == NULL) {
 484                 err("no transfer endpoint found");
 485                 return NULL;
 486         }
 487         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 488                         i, ep->desc.bEndpointAddress);
 489         if (gspca_dev->nbalt > 1) {
 490                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 491                 if (ret < 0) {
 492                         err("set alt %d err %d", i, ret);
 493                         return NULL;
 494                 }
 495         }
 496         gspca_dev->alt = i;             /* memorize the current alt setting */
 497         return ep;
 498 }
 499
 500 /*
 501  * create the URBs for image transfer
 502  */
 503 static int create_urbs(struct gspca_dev *gspca_dev,
 504                         struct usb_host_endpoint *ep)
 505 {
 506         struct urb *urb;
 507         int n, nurbs, i, psize, npkt, bsize;
 508
 509         /* calculate the packet size and the number of packets */
 510         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 511
 512         if (!gspca_dev->cam.bulk) {             /* isoc */
 513
 514                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 515                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 516                 npkt = gspca_dev->cam.npkt;
 517                 if (npkt == 0)
 518                         npkt = 32;              /* default value */
 519                 bsize = psize * npkt;
 520                 PDEBUG(D_STREAM,
 521                         "isoc %d pkts size %d = bsize:%d",
 522                         npkt, psize, bsize);
 523                 nurbs = DEF_NURBS;
 524         } else {                                /* bulk */
 525                 npkt = 0;
 526                 bsize = gspca_dev->cam.bulk_size;
 527                 if (bsize == 0)
 528                         bsize = psize;
 529                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 530                 if (gspca_dev->cam.bulk_nurbs != 0)
 531                         nurbs = gspca_dev->cam.bulk_nurbs;
 532                 else
 533                         nurbs = 1;
 534         }
 535
 536         gspca_dev->nurbs = nurbs;
 537         for (n = 0; n < nurbs; n++) {
 538                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 539                 if (!urb) {
 540                         err("usb_alloc_urb failed");
 541                         destroy_urbs(gspca_dev);
 542                         return -ENOMEM;
 543                 }
 544                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 545                                                 bsize,
 546                                                 GFP_KERNEL,
 547                                                 &urb->transfer_dma);
 548
 549                 if (urb->transfer_buffer == NULL) {
 550                         usb_free_urb(urb);
 551                         err("usb_buffer_urb failed");
 552                         destroy_urbs(gspca_dev);
 553                         return -ENOMEM;
 554                 }
 555                 gspca_dev->urb[n] = urb;
 556                 urb->dev = gspca_dev->dev;
 557                 urb->context = gspca_dev;
 558                 urb->transfer_buffer_length = bsize;
 559                 if (npkt != 0) {                /* ISOC */
 560                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 561                                                     ep->desc.bEndpointAddress);
 562                         urb->transfer_flags = URB_ISO_ASAP
 563                                         | URB_NO_TRANSFER_DMA_MAP;
 564                         urb->interval = ep->desc.bInterval;
 565                         urb->complete = isoc_irq;
 566                         urb->number_of_packets = npkt;
 567                         for (i = 0; i < npkt; i++) {
 568                                 urb->iso_frame_desc[i].length = psize;
 569                                 urb->iso_frame_desc[i].offset = psize * i;
 570                         }
 571                 } else {                /* bulk */
 572                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 573                                                 ep->desc.bEndpointAddress),
 574                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 575                         urb->complete = bulk_irq;
 576                 }
 577         }
 578         return 0;
 579 }
 580
 581 /*
 582  * start the USB transfer
 583  */
 584 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 585 {
 586         struct usb_host_endpoint *ep;
 587         int n, ret;
 588
 589         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 590                 return -ERESTARTSYS;
 591
 592         if (!gspca_dev->present) {
 593                 ret = -ENODEV;
 594                 goto out;
 595         }
 596
 597         /* set the higher alternate setting and
 598          * loop until urb submit succeeds */
 599         gspca_dev->alt = gspca_dev->nbalt;
 600         for (;;) {
 601                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 602                 ep = get_ep(gspca_dev);
 603                 if (ep == NULL) {
 604                         ret = -EIO;
 605                         goto out;
 606                 }
 607                 ret = create_urbs(gspca_dev, ep);
 608                 if (ret < 0)
 609                         goto out;
 610
 611                 /* clear the bulk endpoint */
 612                 if (gspca_dev->cam.bulk)
 613                         usb_clear_halt(gspca_dev->dev,
 614                                         gspca_dev->urb[0]->pipe);
 615
 616                 /* start the cam */
 617                 ret = gspca_dev->sd_desc->start(gspca_dev);
 618                 if (ret < 0) {
 619                         destroy_urbs(gspca_dev);
 620                         goto out;
 621                 }
 622                 gspca_dev->streaming = 1;
 623
 624                 /* some bulk transfers are started by the subdriver */
 625                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 626                         break;
 627
 628                 /* submit the URBs */
 629                 for (n = 0; n < gspca_dev->nurbs; n++) {
 630                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 631                         if (ret < 0) {
 632                                 PDEBUG(D_ERR|D_STREAM,
 633                                         "usb_submit_urb [%d] err %d", n, ret);
 634                                 gspca_dev->streaming = 0;
 635                                 destroy_urbs(gspca_dev);
 636                                 if (ret == -ENOSPC) {
 637                                         msleep(20);     /* wait for kill
 638                                                          * complete */
 639                                         break;  /* try the previous alt */
 640                                 }
 641                                 goto out;
 642                         }
 643                 }
 644                 if (ret >= 0)
 645                         break;
 646         }
 647 out:
 648         mutex_unlock(&gspca_dev->usb_lock);
 649         return ret;
 650 }
 651
 652 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 653 {
 654         int ret;
 655
 656         if (gspca_dev->alt == 0)
 657                 return 0;
 658         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 659         if (ret < 0)
 660                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 661         return ret;
 662 }
 663
 664 /* Note: both the queue and the usb locks should be held when calling this */
 665 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 666 {
 667         gspca_dev->streaming = 0;
 668         if (gspca_dev->present) {
 669                 if (gspca_dev->sd_desc->stopN)
 670                         gspca_dev->sd_desc->stopN(gspca_dev);
 671                 destroy_urbs(gspca_dev);
 672                 gspca_set_alt0(gspca_dev);
 673         }
 674
 675         /* always call stop0 to free the subdriver's resources */
 676         if (gspca_dev->sd_desc->stop0)
 677                 gspca_dev->sd_desc->stop0(gspca_dev);
 678         PDEBUG(D_STREAM, "stream off OK");
 679 }
 680
 681 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 682 {
 683         int i;
 684
 685         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 686         gspca_dev->curr_mode = i;
 687         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 688         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 689         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 690 }
 691
 692 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 693                         int width, int height)
 694 {
 695         int i;
 696
 697         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 698                 if (width >= gspca_dev->cam.cam_mode[i].width
 699                     && height >= gspca_dev->cam.cam_mode[i].height)
 700                         break;
 701         }
 702         return i;
 703 }
 704
 705 /*
 706  * search a mode with the right pixel format
 707  */
 708 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 709                         int mode,
 710                         int pixfmt)
 711 {
 712         int modeU, modeD;
 713
 714         modeU = modeD = mode;
 715         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 716                 if (--modeD >= 0) {
 717                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 718                                                                 == pixfmt)
 719                                 return modeD;
 720                 }
 721                 if (++modeU < gspca_dev->cam.nmodes) {
 722                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 723                                                                 == pixfmt)
 724                                 return modeU;
 725                 }
 726         }
 727         return -EINVAL;
 728 }
 729
 730 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 731                                 struct v4l2_fmtdesc *fmtdesc)
 732 {
 733         struct gspca_dev *gspca_dev = priv;
 734         int i, j, index;
 735         __u32 fmt_tb[8];
 736
 737         /* give an index to each format */
 738         index = 0;
 739         j = 0;
 740         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 741                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 742                 j = 0;
 743                 for (;;) {
 744                         if (fmt_tb[j] == fmt_tb[index])
 745                                 break;
 746                         j++;
 747                 }
 748                 if (j == index) {
 749                         if (fmtdesc->index == index)
 750                                 break;          /* new format */
 751                         index++;
 752                         if (index >= ARRAY_SIZE(fmt_tb))
 753                                 return -EINVAL;
 754                 }
 755         }
 756         if (i < 0)
 757                 return -EINVAL;         /* no more format */
 758
 759         fmtdesc->pixelformat = fmt_tb[index];
 760         if (gspca_is_compressed(fmt_tb[index]))
 761                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 762         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 763         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 764         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 765         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 766         fmtdesc->description[4] = '\0';
 767         return 0;
 768 }
 769
 770 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 771                             struct v4l2_format *fmt)
 772 {
 773         struct gspca_dev *gspca_dev = priv;
 774         int mode;
 775
 776         mode = gspca_dev->curr_mode;
 777         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 778                 sizeof fmt->fmt.pix);
 779         return 0;
 780 }
 781
 782 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 783                         struct v4l2_format *fmt)
 784 {
 785         int w, h, mode, mode2;
 786
 787         w = fmt->fmt.pix.width;
 788         h = fmt->fmt.pix.height;
 789
 790 #ifdef GSPCA_DEBUG
 791         if (gspca_debug & D_CONF)
 792                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 793 #endif
 794         /* search the closest mode for width and height */
 795         mode = wxh_to_mode(gspca_dev, w, h);
 796
 797         /* OK if right palette */
 798         if (gspca_dev->cam.cam_mode[mode].pixelformat
 799                                                 != fmt->fmt.pix.pixelformat) {
 800
 801                 /* else, search the closest mode with the same pixel format */
 802                 mode2 = gspca_get_mode(gspca_dev, mode,
 803                                         fmt->fmt.pix.pixelformat);
 804                 if (mode2 >= 0)
 805                         mode = mode2;
 806 /*              else
 807                         ;                * no chance, return this mode */
 808         }
 809         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 810                 sizeof fmt->fmt.pix);
 811         return mode;                    /* used when s_fmt */
 812 }
 813
 814 static int vidioc_try_fmt_vid_cap(struct file *file,
 815                               void *priv,
 816                               struct v4l2_format *fmt)
 817 {
 818         struct gspca_dev *gspca_dev = priv;
 819         int ret;
 820
 821         ret = try_fmt_vid_cap(gspca_dev, fmt);
 822         if (ret < 0)
 823                 return ret;
 824         return 0;
 825 }
 826
 827 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 828                             struct v4l2_format *fmt)
 829 {
 830         struct gspca_dev *gspca_dev = priv;
 831         int ret;
 832
 833         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 834                 return -ERESTARTSYS;
 835
 836         ret = try_fmt_vid_cap(gspca_dev, fmt);
 837         if (ret < 0)
 838                 goto out;
 839
 840         if (gspca_dev->nframes != 0
 841             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 842                 ret = -EINVAL;
 843                 goto out;
 844         }
 845
 846         if (ret == gspca_dev->curr_mode) {
 847                 ret = 0;
 848                 goto out;                       /* same mode */
 849         }
 850
 851         if (gspca_dev->streaming) {
 852                 ret = -EBUSY;
 853                 goto out;
 854         }
 855         gspca_dev->width = fmt->fmt.pix.width;
 856         gspca_dev->height = fmt->fmt.pix.height;
 857         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 858         gspca_dev->curr_mode = ret;
 859
 860         ret = 0;
 861 out:
 862         mutex_unlock(&gspca_dev->queue_lock);
 863         return ret;
 864 }
 865
 866 static int vidioc_enum_framesizes(struct file *file, void *priv,
 867                                   struct v4l2_frmsizeenum *fsize)
 868 {
 869         struct gspca_dev *gspca_dev = priv;
 870         int i;
 871         __u32 index = 0;
 872
 873         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 874                 if (fsize->pixel_format !=
 875                                 gspca_dev->cam.cam_mode[i].pixelformat)
 876                         continue;
 877
 878                 if (fsize->index == index) {
 879                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 880                         fsize->discrete.width =
 881                                 gspca_dev->cam.cam_mode[i].width;
 882                         fsize->discrete.height =
 883                                 gspca_dev->cam.cam_mode[i].height;
 884                         return 0;
 885                 }
 886                 index++;
 887         }
 888
 889         return -EINVAL;
 890 }
 891
 892 static void gspca_release(struct video_device *vfd)
 893 {
 894         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 895
 896         PDEBUG(D_STREAM, "device released");
 897
 898         kfree(gspca_dev->usb_buf);
 899         kfree(gspca_dev);
 900 }
 901
 902 static int dev_open(struct file *file)
 903 {
 904         struct gspca_dev *gspca_dev;
 905         int ret;
 906
 907         PDEBUG(D_STREAM, "%s open", current->comm);
 908         gspca_dev = (struct gspca_dev *) video_devdata(file);
 909         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 910                 return -ERESTARTSYS;
 911         if (!gspca_dev->present) {
 912                 ret = -ENODEV;
 913                 goto out;
 914         }
 915
 916         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 917                 ret = -EBUSY;
 918                 goto out;
 919         }
 920
 921         /* protect the subdriver against rmmod */
 922         if (!try_module_get(gspca_dev->module)) {
 923                 ret = -ENODEV;
 924                 goto out;
 925         }
 926
 927         gspca_dev->users++;
 928
 929         file->private_data = gspca_dev;
 930 #ifdef GSPCA_DEBUG
 931         /* activate the v4l2 debug */
 932         if (gspca_debug & D_V4L2)
 933                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 934                                         | V4L2_DEBUG_IOCTL_ARG;
 935         else
 936                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 937                                         | V4L2_DEBUG_IOCTL_ARG);
 938 #endif
 939         ret = 0;
 940 out:
 941         mutex_unlock(&gspca_dev->queue_lock);
 942         if (ret != 0)
 943                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 944         else
 945                 PDEBUG(D_STREAM, "open done");
 946         return ret;
 947 }
 948
 949 static int dev_close(struct file *file)
 950 {
 951         struct gspca_dev *gspca_dev = file->private_data;
 952
 953         PDEBUG(D_STREAM, "%s close", current->comm);
 954         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 955                 return -ERESTARTSYS;
 956         gspca_dev->users--;
 957
 958         /* if the file did the capture, free the streaming resources */
 959         if (gspca_dev->capt_file == file) {
 960                 if (gspca_dev->streaming) {
 961                         mutex_lock(&gspca_dev->usb_lock);
 962                         gspca_stream_off(gspca_dev);
 963                         mutex_unlock(&gspca_dev->usb_lock);
 964                 }
 965                 frame_free(gspca_dev);
 966                 gspca_dev->capt_file = NULL;
 967                 gspca_dev->memory = GSPCA_MEMORY_NO;
 968         }
 969         file->private_data = NULL;
 970         module_put(gspca_dev->module);
 971         mutex_unlock(&gspca_dev->queue_lock);
 972
 973         PDEBUG(D_STREAM, "close done");
 974
 975         return 0;
 976 }
 977
 978 static int vidioc_querycap(struct file *file, void  *priv,
 979                            struct v4l2_capability *cap)
 980 {
 981         struct gspca_dev *gspca_dev = priv;
 982         int ret;
 983
 984         /* protect the access to the usb device */
 985         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 986                 return -ERESTARTSYS;
 987         if (!gspca_dev->present) {
 988                 ret = -ENODEV;
 989                 goto out;
 990         }
 991         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 992         if (gspca_dev->dev->product != NULL) {
 993                 strncpy(cap->card, gspca_dev->dev->product,
 994                         sizeof cap->card);
 995         } else {
 996                 snprintf(cap->card, sizeof cap->card,
 997                         "USB Camera (%04x:%04x)",
 998                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 999                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1000         }
1001         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1002         cap->version = DRIVER_VERSION_NUMBER;
1003         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1004                           | V4L2_CAP_STREAMING
1005                           | V4L2_CAP_READWRITE;
1006         ret = 0;
1007 out:
1008         mutex_unlock(&gspca_dev->usb_lock);
1009         return ret;
1010 }
1011
1012 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1013                                    int id)
1014 {
1015         const struct ctrl *ctrls;
1016         int i;
1017
1018         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1019              i < gspca_dev->sd_desc->nctrls;
1020              i++, ctrls++) {
1021                 if (gspca_dev->ctrl_dis & (1 << i))
1022                         continue;
1023                 if (id == ctrls->qctrl.id)
1024                         return ctrls;
1025         }
1026         return NULL;
1027 }
1028
1029 static int vidioc_queryctrl(struct file *file, void *priv,
1030                            struct v4l2_queryctrl *q_ctrl)
1031 {
1032         struct gspca_dev *gspca_dev = priv;
1033         const struct ctrl *ctrls;
1034         int i;
1035         u32 id;
1036
1037         ctrls = NULL;
1038         id = q_ctrl->id;
1039         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1040                 id &= V4L2_CTRL_ID_MASK;
1041                 id++;
1042                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1043                         if (gspca_dev->ctrl_dis & (1 << i))
1044                                 continue;
1045                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1046                                 continue;
1047                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1048                                             > ctrls->qctrl.id)
1049                                 continue;
1050                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1051                 }
1052         } else {
1053                 ctrls = get_ctrl(gspca_dev, id);
1054         }
1055         if (ctrls == NULL)
1056                 return -EINVAL;
1057         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1058         return 0;
1059 }
1060
1061 static int vidioc_s_ctrl(struct file *file, void *priv,
1062                          struct v4l2_control *ctrl)
1063 {
1064         struct gspca_dev *gspca_dev = priv;
1065         const struct ctrl *ctrls;
1066         int ret;
1067
1068         ctrls = get_ctrl(gspca_dev, ctrl->id);
1069         if (ctrls == NULL)
1070                 return -EINVAL;
1071
1072         if (ctrl->value < ctrls->qctrl.minimum
1073             || ctrl->value > ctrls->qctrl.maximum)
1074                 return -ERANGE;
1075         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1076         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1077                 return -ERESTARTSYS;
1078         if (gspca_dev->present)
1079                 ret = ctrls->set(gspca_dev, ctrl->value);
1080         else
1081                 ret = -ENODEV;
1082         mutex_unlock(&gspca_dev->usb_lock);
1083         return ret;
1084 }
1085
1086 static int vidioc_g_ctrl(struct file *file, void *priv,
1087                          struct v4l2_control *ctrl)
1088 {
1089         struct gspca_dev *gspca_dev = priv;
1090         const struct ctrl *ctrls;
1091         int ret;
1092
1093         ctrls = get_ctrl(gspca_dev, ctrl->id);
1094         if (ctrls == NULL)
1095                 return -EINVAL;
1096
1097         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1098                 return -ERESTARTSYS;
1099         if (gspca_dev->present)
1100                 ret = ctrls->get(gspca_dev, &ctrl->value);
1101         else
1102                 ret = -ENODEV;
1103         mutex_unlock(&gspca_dev->usb_lock);
1104         return ret;
1105 }
1106
1107 /*fixme: have an audio flag in gspca_dev?*/
1108 static int vidioc_s_audio(struct file *file, void *priv,
1109                          struct v4l2_audio *audio)
1110 {
1111         if (audio->index != 0)
1112                 return -EINVAL;
1113         return 0;
1114 }
1115
1116 static int vidioc_g_audio(struct file *file, void *priv,
1117                          struct v4l2_audio *audio)
1118 {
1119         strcpy(audio->name, "Microphone");
1120         return 0;
1121 }
1122
1123 static int vidioc_enumaudio(struct file *file, void *priv,
1124                          struct v4l2_audio *audio)
1125 {
1126         if (audio->index != 0)
1127                 return -EINVAL;
1128
1129         strcpy(audio->name, "Microphone");
1130         audio->capability = 0;
1131         audio->mode = 0;
1132         return 0;
1133 }
1134
1135 static int vidioc_querymenu(struct file *file, void *priv,
1136                             struct v4l2_querymenu *qmenu)
1137 {
1138         struct gspca_dev *gspca_dev = priv;
1139
1140         if (!gspca_dev->sd_desc->querymenu)
1141                 return -EINVAL;
1142         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1143 }
1144
1145 static int vidioc_enum_input(struct file *file, void *priv,
1146                                 struct v4l2_input *input)
1147 {
1148         struct gspca_dev *gspca_dev = priv;
1149
1150         if (input->index != 0)
1151                 return -EINVAL;
1152         input->type = V4L2_INPUT_TYPE_CAMERA;
1153         input->status = gspca_dev->cam.input_flags;
1154         strncpy(input->name, gspca_dev->sd_desc->name,
1155                 sizeof input->name);
1156         return 0;
1157 }
1158
1159 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1160 {
1161         *i = 0;
1162         return 0;
1163 }
1164
1165 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1166 {
1167         if (i > 0)
1168                 return -EINVAL;
1169         return (0);
1170 }
1171
1172 static int vidioc_reqbufs(struct file *file, void *priv,
1173                           struct v4l2_requestbuffers *rb)
1174 {
1175         struct gspca_dev *gspca_dev = priv;
1176         int i, ret = 0;
1177
1178         switch (rb->memory) {
1179         case GSPCA_MEMORY_READ:                 /* (internal call) */
1180         case V4L2_MEMORY_MMAP:
1181         case V4L2_MEMORY_USERPTR:
1182                 break;
1183         default:
1184                 return -EINVAL;
1185         }
1186         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1187                 return -ERESTARTSYS;
1188
1189         if (gspca_dev->memory != GSPCA_MEMORY_NO
1190             && gspca_dev->memory != rb->memory) {
1191                 ret = -EBUSY;
1192                 goto out;
1193         }
1194
1195         /* only one file may do the capture */
1196         if (gspca_dev->capt_file != NULL
1197             && gspca_dev->capt_file != file) {
1198                 ret = -EBUSY;
1199                 goto out;
1200         }
1201
1202         /* if allocated, the buffers must not be mapped */
1203         for (i = 0; i < gspca_dev->nframes; i++) {
1204                 if (gspca_dev->frame[i].vma_use_count) {
1205                         ret = -EBUSY;
1206                         goto out;
1207                 }
1208         }
1209
1210         /* stop streaming */
1211         if (gspca_dev->streaming) {
1212                 mutex_lock(&gspca_dev->usb_lock);
1213                 gspca_stream_off(gspca_dev);
1214                 mutex_unlock(&gspca_dev->usb_lock);
1215         }
1216
1217         /* free the previous allocated buffers, if any */
1218         if (gspca_dev->nframes != 0) {
1219                 frame_free(gspca_dev);
1220                 gspca_dev->capt_file = NULL;
1221         }
1222         if (rb->count == 0)                     /* unrequest */
1223                 goto out;
1224         gspca_dev->memory = rb->memory;
1225         ret = frame_alloc(gspca_dev, rb->count);
1226         if (ret == 0) {
1227                 rb->count = gspca_dev->nframes;
1228                 gspca_dev->capt_file = file;
1229         }
1230 out:
1231         mutex_unlock(&gspca_dev->queue_lock);
1232         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1233         return ret;
1234 }
1235
1236 static int vidioc_querybuf(struct file *file, void *priv,
1237                            struct v4l2_buffer *v4l2_buf)
1238 {
1239         struct gspca_dev *gspca_dev = priv;
1240         struct gspca_frame *frame;
1241
1242         if (v4l2_buf->index < 0
1243             || v4l2_buf->index >= gspca_dev->nframes)
1244                 return -EINVAL;
1245
1246         frame = &gspca_dev->frame[v4l2_buf->index];
1247         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1248         return 0;
1249 }
1250
1251 static int vidioc_streamon(struct file *file, void *priv,
1252                            enum v4l2_buf_type buf_type)
1253 {
1254         struct gspca_dev *gspca_dev = priv;
1255         int ret;
1256
1257         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1258                 return -EINVAL;
1259         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1260                 return -ERESTARTSYS;
1261
1262         if (gspca_dev->nframes == 0
1263             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1264                 ret = -EINVAL;
1265                 goto out;
1266         }
1267         if (!gspca_dev->streaming) {
1268                 ret = gspca_init_transfer(gspca_dev);
1269                 if (ret < 0)
1270                         goto out;
1271         }
1272 #ifdef GSPCA_DEBUG
1273         if (gspca_debug & D_STREAM) {
1274                 PDEBUG_MODE("stream on OK",
1275                         gspca_dev->pixfmt,
1276                         gspca_dev->width,
1277                         gspca_dev->height);
1278         }
1279 #endif
1280         ret = 0;
1281 out:
1282         mutex_unlock(&gspca_dev->queue_lock);
1283         return ret;
1284 }
1285
1286 static int vidioc_streamoff(struct file *file, void *priv,
1287                                 enum v4l2_buf_type buf_type)
1288 {
1289         struct gspca_dev *gspca_dev = priv;
1290         int i, ret;
1291
1292         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1293                 return -EINVAL;
1294         if (!gspca_dev->streaming)
1295                 return 0;
1296         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1297                 return -ERESTARTSYS;
1298
1299         /* stop streaming */
1300         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1301                 ret = -ERESTARTSYS;
1302                 goto out;
1303         }
1304         gspca_stream_off(gspca_dev);
1305         mutex_unlock(&gspca_dev->usb_lock);
1306
1307         /* empty the application queues */
1308         for (i = 0; i < gspca_dev->nframes; i++)
1309                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1310         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1311         gspca_dev->last_packet_type = DISCARD_PACKET;
1312         gspca_dev->sequence = 0;
1313         ret = 0;
1314 out:
1315         mutex_unlock(&gspca_dev->queue_lock);
1316         return ret;
1317 }
1318
1319 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1320                         struct v4l2_jpegcompression *jpegcomp)
1321 {
1322         struct gspca_dev *gspca_dev = priv;
1323         int ret;
1324
1325         if (!gspca_dev->sd_desc->get_jcomp)
1326                 return -EINVAL;
1327         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1328                 return -ERESTARTSYS;
1329         if (gspca_dev->present)
1330                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1331         else
1332                 ret = -ENODEV;
1333         mutex_unlock(&gspca_dev->usb_lock);
1334         return ret;
1335 }
1336
1337 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1338                         struct v4l2_jpegcompression *jpegcomp)
1339 {
1340         struct gspca_dev *gspca_dev = priv;
1341         int ret;
1342
1343         if (!gspca_dev->sd_desc->set_jcomp)
1344                 return -EINVAL;
1345         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1346                 return -ERESTARTSYS;
1347         if (gspca_dev->present)
1348                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1349         else
1350                 ret = -ENODEV;
1351         mutex_unlock(&gspca_dev->usb_lock);
1352         return ret;
1353 }
1354
1355 static int vidioc_g_parm(struct file *filp, void *priv,
1356                         struct v4l2_streamparm *parm)
1357 {
1358         struct gspca_dev *gspca_dev = priv;
1359
1360         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1361
1362         if (gspca_dev->sd_desc->get_streamparm) {
1363                 int ret;
1364
1365                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1366                         return -ERESTARTSYS;
1367                 if (gspca_dev->present)
1368                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1369                                                                  parm);
1370                 else
1371                         ret = -ENODEV;
1372                 mutex_unlock(&gspca_dev->usb_lock);
1373                 return ret;
1374         }
1375
1376         return 0;
1377 }
1378
1379 static int vidioc_s_parm(struct file *filp, void *priv,
1380                         struct v4l2_streamparm *parm)
1381 {
1382         struct gspca_dev *gspca_dev = priv;
1383         int n;
1384
1385         n = parm->parm.capture.readbuffers;
1386         if (n == 0 || n > GSPCA_MAX_FRAMES)
1387                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1388         else
1389                 gspca_dev->nbufread = n;
1390
1391         if (gspca_dev->sd_desc->set_streamparm) {
1392                 int ret;
1393
1394                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1395                         return -ERESTARTSYS;
1396                 if (gspca_dev->present)
1397                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1398                                                                  parm);
1399                 else
1400                         ret = -ENODEV;
1401                 mutex_unlock(&gspca_dev->usb_lock);
1402                 return ret;
1403         }
1404
1405         return 0;
1406 }
1407
1408 static int vidioc_s_std(struct file *filp, void *priv,
1409                         v4l2_std_id *parm)
1410 {
1411         return 0;
1412 }
1413
1414 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1415 static int vidiocgmbuf(struct file *file, void *priv,
1416                         struct video_mbuf *mbuf)
1417 {
1418         struct gspca_dev *gspca_dev = file->private_data;
1419         int i;
1420
1421         PDEBUG(D_STREAM, "cgmbuf");
1422         if (gspca_dev->nframes == 0) {
1423                 int ret;
1424
1425                 {
1426                         struct v4l2_format fmt;
1427
1428                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1429                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1430                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1431                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1432                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1433                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1434                         if (ret != 0)
1435                                 return ret;
1436                 }
1437                 {
1438                         struct v4l2_requestbuffers rb;
1439
1440                         memset(&rb, 0, sizeof rb);
1441                         rb.count = 4;
1442                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1443                         rb.memory = V4L2_MEMORY_MMAP;
1444                         ret = vidioc_reqbufs(file, priv, &rb);
1445                         if (ret != 0)
1446                                 return ret;
1447                 }
1448         }
1449         mbuf->frames = gspca_dev->nframes;
1450         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1451         for (i = 0; i < mbuf->frames; i++)
1452                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1453         return 0;
1454 }
1455 #endif
1456
1457 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1458 {
1459         struct gspca_dev *gspca_dev = file->private_data;
1460         struct gspca_frame *frame;
1461         struct page *page;
1462         unsigned long addr, start, size;
1463         int i, ret;
1464
1465         start = vma->vm_start;
1466         size = vma->vm_end - vma->vm_start;
1467         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1468
1469         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1470                 return -ERESTARTSYS;
1471         if (!gspca_dev->present) {
1472                 ret = -ENODEV;
1473                 goto out;
1474         }
1475         if (gspca_dev->capt_file != file) {
1476                 ret = -EINVAL;
1477                 goto out;
1478         }
1479
1480         frame = NULL;
1481         for (i = 0; i < gspca_dev->nframes; ++i) {
1482                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1483                         PDEBUG(D_STREAM, "mmap bad memory type");
1484                         break;
1485                 }
1486                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1487                                                 == vma->vm_pgoff) {
1488                         frame = &gspca_dev->frame[i];
1489                         break;
1490                 }
1491         }
1492         if (frame == NULL) {
1493                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1494                 ret = -EINVAL;
1495                 goto out;
1496         }
1497 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1498         /* v4l1 maps all the buffers */
1499         if (i != 0
1500             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1501 #endif
1502             if (size != frame->v4l2_buf.length) {
1503                 PDEBUG(D_STREAM, "mmap bad size");
1504                 ret = -EINVAL;
1505                 goto out;
1506         }
1507
1508         /*
1509          * - VM_IO marks the area as being a mmaped region for I/O to a
1510          *   device. It also prevents the region from being core dumped.
1511          */
1512         vma->vm_flags |= VM_IO;
1513
1514         addr = (unsigned long) frame->data;
1515         while (size > 0) {
1516                 page = vmalloc_to_page((void *) addr);
1517                 ret = vm_insert_page(vma, start, page);
1518                 if (ret < 0)
1519                         goto out;
1520                 start += PAGE_SIZE;
1521                 addr += PAGE_SIZE;
1522                 size -= PAGE_SIZE;
1523         }
1524
1525         vma->vm_ops = &gspca_vm_ops;
1526         vma->vm_private_data = frame;
1527         gspca_vm_open(vma);
1528         ret = 0;
1529 out:
1530         mutex_unlock(&gspca_dev->queue_lock);
1531         return ret;
1532 }
1533
1534 /*
1535  * wait for a video frame
1536  *
1537  * If a frame is ready, its index is returned.
1538  */
1539 static int frame_wait(struct gspca_dev *gspca_dev,
1540                         int nonblock_ing)
1541 {
1542         struct gspca_frame *frame;
1543         int i, j, ret;
1544
1545         /* check if a frame is ready */
1546         i = gspca_dev->fr_o;
1547         j = gspca_dev->fr_queue[i];
1548         frame = &gspca_dev->frame[j];
1549
1550         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1551                 if (nonblock_ing)
1552                         return -EAGAIN;
1553
1554                 /* wait till a frame is ready */
1555                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1556                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1557                         !gspca_dev->streaming || !gspca_dev->present,
1558                         msecs_to_jiffies(3000));
1559                 if (ret < 0)
1560                         return ret;
1561                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1562                         return -EIO;
1563         }
1564
1565         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1566         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1567                 gspca_dev->fr_q,
1568                 gspca_dev->fr_i,
1569                 gspca_dev->fr_o);
1570
1571         if (gspca_dev->sd_desc->dq_callback) {
1572                 mutex_lock(&gspca_dev->usb_lock);
1573                 if (gspca_dev->present)
1574                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1575                 mutex_unlock(&gspca_dev->usb_lock);
1576         }
1577         return j;
1578 }
1579
1580 /*
1581  * dequeue a video buffer
1582  *
1583  * If nonblock_ing is false, block until a buffer is available.
1584  */
1585 static int vidioc_dqbuf(struct file *file, void *priv,
1586                         struct v4l2_buffer *v4l2_buf)
1587 {
1588         struct gspca_dev *gspca_dev = priv;
1589         struct gspca_frame *frame;
1590         int i, ret;
1591
1592         PDEBUG(D_FRAM, "dqbuf");
1593         if (v4l2_buf->memory != gspca_dev->memory)
1594                 return -EINVAL;
1595
1596         if (!gspca_dev->present)
1597                 return -ENODEV;
1598
1599         /* if not streaming, be sure the application will not loop forever */
1600         if (!(file->f_flags & O_NONBLOCK)
1601             && !gspca_dev->streaming && gspca_dev->users == 1)
1602                 return -EINVAL;
1603
1604         /* only the capturing file may dequeue */
1605         if (gspca_dev->capt_file != file)
1606                 return -EINVAL;
1607
1608         /* only one dequeue / read at a time */
1609         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1610                 return -ERESTARTSYS;
1611
1612         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1613         if (ret < 0)
1614                 goto out;
1615         i = ret;                                /* frame index */
1616         frame = &gspca_dev->frame[i];
1617         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1618                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1619                                  frame->data,
1620                                  frame->v4l2_buf.bytesused)) {
1621                         PDEBUG(D_ERR|D_STREAM,
1622                                 "dqbuf cp to user failed");
1623                         ret = -EFAULT;
1624                         goto out;
1625                 }
1626         }
1627         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1628         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1629         PDEBUG(D_FRAM, "dqbuf %d", i);
1630         ret = 0;
1631 out:
1632         mutex_unlock(&gspca_dev->read_lock);
1633         return ret;
1634 }
1635
1636 /*
1637  * queue a video buffer
1638  *
1639  * Attempting to queue a buffer that has already been
1640  * queued will return -EINVAL.
1641  */
1642 static int vidioc_qbuf(struct file *file, void *priv,
1643                         struct v4l2_buffer *v4l2_buf)
1644 {
1645         struct gspca_dev *gspca_dev = priv;
1646         struct gspca_frame *frame;
1647         int i, index, ret;
1648
1649         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1650
1651         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1652                 return -ERESTARTSYS;
1653
1654         index = v4l2_buf->index;
1655         if ((unsigned) index >= gspca_dev->nframes) {
1656                 PDEBUG(D_FRAM,
1657                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1658                 ret = -EINVAL;
1659                 goto out;
1660         }
1661         if (v4l2_buf->memory != gspca_dev->memory) {
1662                 PDEBUG(D_FRAM, "qbuf bad memory type");
1663                 ret = -EINVAL;
1664                 goto out;
1665         }
1666
1667         frame = &gspca_dev->frame[index];
1668         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1669                 PDEBUG(D_FRAM, "qbuf bad state");
1670                 ret = -EINVAL;
1671                 goto out;
1672         }
1673
1674         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1675
1676         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1677                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1678                 frame->v4l2_buf.length = v4l2_buf->length;
1679         }
1680
1681         /* put the buffer in the 'queued' queue */
1682         i = gspca_dev->fr_q;
1683         gspca_dev->fr_queue[i] = index;
1684         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1685         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1686                 gspca_dev->fr_q,
1687                 gspca_dev->fr_i,
1688                 gspca_dev->fr_o);
1689
1690         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1691         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1692         ret = 0;
1693 out:
1694         mutex_unlock(&gspca_dev->queue_lock);
1695         return ret;
1696 }
1697
1698 /*
1699  * allocate the resources for read()
1700  */
1701 static int read_alloc(struct gspca_dev *gspca_dev,
1702                         struct file *file)
1703 {
1704         struct v4l2_buffer v4l2_buf;
1705         int i, ret;
1706
1707         PDEBUG(D_STREAM, "read alloc");
1708         if (gspca_dev->nframes == 0) {
1709                 struct v4l2_requestbuffers rb;
1710
1711                 memset(&rb, 0, sizeof rb);
1712                 rb.count = gspca_dev->nbufread;
1713                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1714                 rb.memory = GSPCA_MEMORY_READ;
1715                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1716                 if (ret != 0) {
1717                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1718                         return ret;
1719                 }
1720                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1721                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1722                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1723                 for (i = 0; i < gspca_dev->nbufread; i++) {
1724                         v4l2_buf.index = i;
1725                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1726                         if (ret != 0) {
1727                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1728                                 return ret;
1729                         }
1730                 }
1731                 gspca_dev->memory = GSPCA_MEMORY_READ;
1732         }
1733
1734         /* start streaming */
1735         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1736         if (ret != 0)
1737                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1738         return ret;
1739 }
1740
1741 static unsigned int dev_poll(struct file *file, poll_table *wait)
1742 {
1743         struct gspca_dev *gspca_dev = file->private_data;
1744         int i, ret;
1745
1746         PDEBUG(D_FRAM, "poll");
1747
1748         poll_wait(file, &gspca_dev->wq, wait);
1749
1750         /* if reqbufs is not done, the user would use read() */
1751         if (gspca_dev->nframes == 0) {
1752                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1753                         return POLLERR;         /* not the 1st time */
1754                 ret = read_alloc(gspca_dev, file);
1755                 if (ret != 0)
1756                         return POLLERR;
1757         }
1758
1759         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1760                 return POLLERR;
1761
1762         /* check the next incoming buffer */
1763         i = gspca_dev->fr_o;
1764         i = gspca_dev->fr_queue[i];
1765         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1766                 ret = POLLIN | POLLRDNORM;      /* something to read */
1767         else
1768                 ret = 0;
1769         mutex_unlock(&gspca_dev->queue_lock);
1770         if (!gspca_dev->present)
1771                 return POLLHUP;
1772         return ret;
1773 }
1774
1775 static ssize_t dev_read(struct file *file, char __user *data,
1776                     size_t count, loff_t *ppos)
1777 {
1778         struct gspca_dev *gspca_dev = file->private_data;
1779         struct gspca_frame *frame;
1780         struct v4l2_buffer v4l2_buf;
1781         struct timeval timestamp;
1782         int n, ret, ret2;
1783
1784         PDEBUG(D_FRAM, "read (%zd)", count);
1785         if (!gspca_dev->present)
1786                 return -ENODEV;
1787         switch (gspca_dev->memory) {
1788         case GSPCA_MEMORY_NO:                   /* first time */
1789                 ret = read_alloc(gspca_dev, file);
1790                 if (ret != 0)
1791                         return ret;
1792                 break;
1793         case GSPCA_MEMORY_READ:
1794                 if (gspca_dev->capt_file == file)
1795                         break;
1796                 /* fall thru */
1797         default:
1798                 return -EINVAL;
1799         }
1800
1801         /* get a frame */
1802         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1803         timestamp.tv_sec--;
1804         n = 2;
1805         for (;;) {
1806                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1807                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1808                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1809                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1810                 if (ret != 0) {
1811                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1812                         return ret;
1813                 }
1814
1815                 /* if the process slept for more than 1 second,
1816                  * get a newer frame */
1817                 frame = &gspca_dev->frame[v4l2_buf.index];
1818                 if (--n < 0)
1819                         break;                  /* avoid infinite loop */
1820                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1821                         break;
1822                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1823                 if (ret != 0) {
1824                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1825                         return ret;
1826                 }
1827         }
1828
1829         /* copy the frame */
1830         if (count > frame->v4l2_buf.bytesused)
1831                 count = frame->v4l2_buf.bytesused;
1832         ret = copy_to_user(data, frame->data, count);
1833         if (ret != 0) {
1834                 PDEBUG(D_ERR|D_STREAM,
1835                         "read cp to user lack %d / %zd", ret, count);
1836                 ret = -EFAULT;
1837                 goto out;
1838         }
1839         ret = count;
1840 out:
1841         /* in each case, requeue the buffer */
1842         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1843         if (ret2 != 0)
1844                 return ret2;
1845         return ret;
1846 }
1847
1848 static struct v4l2_file_operations dev_fops = {
1849         .owner = THIS_MODULE,
1850         .open = dev_open,
1851         .release = dev_close,
1852         .read = dev_read,
1853         .mmap = dev_mmap,
1854         .unlocked_ioctl = video_ioctl2,
1855         .poll   = dev_poll,
1856 };
1857
1858 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1859         .vidioc_querycap        = vidioc_querycap,
1860         .vidioc_dqbuf           = vidioc_dqbuf,
1861         .vidioc_qbuf            = vidioc_qbuf,
1862         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1863         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1864         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1865         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1866         .vidioc_streamon        = vidioc_streamon,
1867         .vidioc_queryctrl       = vidioc_queryctrl,
1868         .vidioc_g_ctrl          = vidioc_g_ctrl,
1869         .vidioc_s_ctrl          = vidioc_s_ctrl,
1870         .vidioc_g_audio         = vidioc_g_audio,
1871         .vidioc_s_audio         = vidioc_s_audio,
1872         .vidioc_enumaudio       = vidioc_enumaudio,
1873         .vidioc_querymenu       = vidioc_querymenu,
1874         .vidioc_enum_input      = vidioc_enum_input,
1875         .vidioc_g_input         = vidioc_g_input,
1876         .vidioc_s_input         = vidioc_s_input,
1877         .vidioc_reqbufs         = vidioc_reqbufs,
1878         .vidioc_querybuf        = vidioc_querybuf,
1879         .vidioc_streamoff       = vidioc_streamoff,
1880         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1881         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1882         .vidioc_g_parm          = vidioc_g_parm,
1883         .vidioc_s_parm          = vidioc_s_parm,
1884         .vidioc_s_std           = vidioc_s_std,
1885         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1886 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1887         .vidiocgmbuf          = vidiocgmbuf,
1888 #endif
1889 };
1890
1891 static struct video_device gspca_template = {
1892         .name = "gspca main driver",
1893         .fops = &dev_fops,
1894         .ioctl_ops = &dev_ioctl_ops,
1895         .release = gspca_release,
1896         .minor = -1,
1897 };
1898
1899 /*
1900  * probe and create a new gspca device
1901  *
1902  * This function must be called by the sub-driver when it is
1903  * called for probing a new device.
1904  */
1905 int gspca_dev_probe(struct usb_interface *intf,
1906                 const struct usb_device_id *id,
1907                 const struct sd_desc *sd_desc,
1908                 int dev_size,
1909                 struct module *module)
1910 {
1911         struct usb_interface_descriptor *interface;
1912         struct gspca_dev *gspca_dev;
1913         struct usb_device *dev = interface_to_usbdev(intf);
1914         int ret;
1915
1916         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1917
1918         /* we don't handle multi-config cameras */
1919         if (dev->descriptor.bNumConfigurations != 1)
1920                 return -ENODEV;
1921         interface = &intf->cur_altsetting->desc;
1922         if (interface->bInterfaceNumber > 0)
1923                 return -ENODEV;
1924
1925         /* create the device */
1926         if (dev_size < sizeof *gspca_dev)
1927                 dev_size = sizeof *gspca_dev;
1928         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1929         if (!gspca_dev) {
1930                 err("couldn't kzalloc gspca struct");
1931                 return -ENOMEM;
1932         }
1933         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1934         if (!gspca_dev->usb_buf) {
1935                 err("out of memory");
1936                 ret = -ENOMEM;
1937                 goto out;
1938         }
1939         gspca_dev->dev = dev;
1940         gspca_dev->iface = interface->bInterfaceNumber;
1941         gspca_dev->nbalt = intf->num_altsetting;
1942         gspca_dev->sd_desc = sd_desc;
1943         gspca_dev->nbufread = 2;
1944         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1945
1946         /* configure the subdriver and initialize the USB device */
1947         ret = sd_desc->config(gspca_dev, id);
1948         if (ret < 0)
1949                 goto out;
1950         ret = sd_desc->init(gspca_dev);
1951         if (ret < 0)
1952                 goto out;
1953         ret = gspca_set_alt0(gspca_dev);
1954         if (ret < 0)
1955                 goto out;
1956         gspca_set_default_mode(gspca_dev);
1957
1958         mutex_init(&gspca_dev->usb_lock);
1959         mutex_init(&gspca_dev->read_lock);
1960         mutex_init(&gspca_dev->queue_lock);
1961         init_waitqueue_head(&gspca_dev->wq);
1962
1963         /* init video stuff */
1964         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1965         gspca_dev->vdev.parent = &intf->dev;
1966         gspca_dev->module = module;
1967         gspca_dev->present = 1;
1968         ret = video_register_device(&gspca_dev->vdev,
1969                                   VFL_TYPE_GRABBER,
1970                                   -1);
1971         if (ret < 0) {
1972                 err("video_register_device err %d", ret);
1973                 goto out;
1974         }
1975
1976         usb_set_intfdata(intf, gspca_dev);
1977         PDEBUG(D_PROBE, "probe ok");
1978         return 0;
1979 out:
1980         kfree(gspca_dev->usb_buf);
1981         kfree(gspca_dev);
1982         return ret;
1983 }
1984 EXPORT_SYMBOL(gspca_dev_probe);
1985
1986 /*
1987  * USB disconnection
1988  *
1989  * This function must be called by the sub-driver
1990  * when the device disconnects, after the specific resources are freed.
1991  */
1992 void gspca_disconnect(struct usb_interface *intf)
1993 {
1994         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1995
1996         mutex_lock(&gspca_dev->usb_lock);
1997         gspca_dev->present = 0;
1998
1999         if (gspca_dev->streaming) {
2000                 destroy_urbs(gspca_dev);
2001                 wake_up_interruptible(&gspca_dev->wq);
2002         }
2003
2004         /* the device is freed at exit of this function */
2005         gspca_dev->dev = NULL;
2006         mutex_unlock(&gspca_dev->usb_lock);
2007
2008         usb_set_intfdata(intf, NULL);
2009
2010         /* release the device */
2011         /* (this will call gspca_release() immediatly or on last close) */
2012         video_unregister_device(&gspca_dev->vdev);
2013
2014         PDEBUG(D_PROBE, "disconnect complete");
2015 }
2016 EXPORT_SYMBOL(gspca_disconnect);
2017
2018 #ifdef CONFIG_PM
2019 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2020 {
2021         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2022
2023         if (!gspca_dev->streaming)
2024                 return 0;
2025         gspca_dev->frozen = 1;          /* avoid urb error messages */
2026         if (gspca_dev->sd_desc->stopN)
2027                 gspca_dev->sd_desc->stopN(gspca_dev);
2028         destroy_urbs(gspca_dev);
2029         gspca_set_alt0(gspca_dev);
2030         if (gspca_dev->sd_desc->stop0)
2031                 gspca_dev->sd_desc->stop0(gspca_dev);
2032         return 0;
2033 }
2034 EXPORT_SYMBOL(gspca_suspend);
2035
2036 int gspca_resume(struct usb_interface *intf)
2037 {
2038         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2039
2040         gspca_dev->frozen = 0;
2041         gspca_dev->sd_desc->init(gspca_dev);
2042         if (gspca_dev->streaming)
2043                 return gspca_init_transfer(gspca_dev);
2044         return 0;
2045 }
2046 EXPORT_SYMBOL(gspca_resume);
2047 #endif
2048 /* -- cam driver utility functions -- */
2049
2050 /* auto gain and exposure algorithm based on the knee algorithm described here:
2051    http://ytse.tricolour.net/docs/LowLightOptimization.html
2052
2053    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2054    where changed. */
2055 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2056         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2057 {
2058         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2059         const struct ctrl *gain_ctrl = NULL;
2060         const struct ctrl *exposure_ctrl = NULL;
2061         const struct ctrl *autogain_ctrl = NULL;
2062         int retval = 0;
2063
2064         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2065                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2066                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2067                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2068                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2069                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2070                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2071         }
2072         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2073                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2074                         "on cam without (auto)gain/exposure");
2075                 return 0;
2076         }
2077
2078         if (gain_ctrl->get(gspca_dev, &gain) ||
2079                         exposure_ctrl->get(gspca_dev, &exposure) ||
2080                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2081                 return 0;
2082
2083         orig_gain = gain;
2084         orig_exposure = exposure;
2085
2086         /* If we are of a multiple of deadzone, do multiple steps to reach the
2087            desired lumination fast (with the risc of a slight overshoot) */
2088         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2089
2090         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2091                 avg_lum, desired_avg_lum, steps);
2092
2093         for (i = 0; i < steps; i++) {
2094                 if (avg_lum > desired_avg_lum) {
2095                         if (gain > gain_knee)
2096                                 gain--;
2097                         else if (exposure > exposure_knee)
2098                                 exposure--;
2099                         else if (gain > gain_ctrl->qctrl.default_value)
2100                                 gain--;
2101                         else if (exposure > exposure_ctrl->qctrl.minimum)
2102                                 exposure--;
2103                         else if (gain > gain_ctrl->qctrl.minimum)
2104                                 gain--;
2105                         else
2106                                 break;
2107                 } else {
2108                         if (gain < gain_ctrl->qctrl.default_value)
2109                                 gain++;
2110                         else if (exposure < exposure_knee)
2111                                 exposure++;
2112                         else if (gain < gain_knee)
2113                                 gain++;
2114                         else if (exposure < exposure_ctrl->qctrl.maximum)
2115                                 exposure++;
2116                         else if (gain < gain_ctrl->qctrl.maximum)
2117                                 gain++;
2118                         else
2119                                 break;
2120                 }
2121         }
2122
2123         if (gain != orig_gain) {
2124                 gain_ctrl->set(gspca_dev, gain);
2125                 retval = 1;
2126         }
2127         if (exposure != orig_exposure) {
2128                 exposure_ctrl->set(gspca_dev, exposure);
2129                 retval = 1;
2130         }
2131
2132         return retval;
2133 }
2134 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2135
2136 /* -- module insert / remove -- */
2137 static int __init gspca_init(void)
2138 {
2139         info("main v%d.%d.%d registered",
2140                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2141                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2142                 DRIVER_VERSION_NUMBER & 0xff);
2143         return 0;
2144 }
2145 static void __exit gspca_exit(void)
2146 {
2147         info("main deregistered");
2148 }
2149
2150 module_init(gspca_init);
2151 module_exit(gspca_exit);
2152
2153 #ifdef GSPCA_DEBUG
2154 module_param_named(debug, gspca_debug, int, 0644);
2155 MODULE_PARM_DESC(debug,
2156                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2157                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2158                 " 0x0100: v4l2");
2159 #endif