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 #ifdef CONFIG_VIDEO_ADV_DEBUG
 731 static int vidioc_g_register(struct file *file, void *priv,
 732                         struct v4l2_dbg_register *reg)
 733 {
 734         int ret;
 735         struct gspca_dev *gspca_dev = priv;
 736
 737         if (!gspca_dev->sd_desc->get_chip_ident)
 738                 return -EINVAL;
 739
 740         if (!gspca_dev->sd_desc->get_register)
 741                 return -EINVAL;
 742
 743         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 744                 return -ERESTARTSYS;
 745         if (gspca_dev->present)
 746                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 747         else
 748                 ret = -ENODEV;
 749         mutex_unlock(&gspca_dev->usb_lock);
 750
 751         return ret;
 752 }
 753
 754 static int vidioc_s_register(struct file *file, void *priv,
 755                         struct v4l2_dbg_register *reg)
 756 {
 757         int ret;
 758         struct gspca_dev *gspca_dev = priv;
 759
 760         if (!gspca_dev->sd_desc->get_chip_ident)
 761                 return -EINVAL;
 762
 763         if (!gspca_dev->sd_desc->set_register)
 764                 return -EINVAL;
 765
 766         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 767                 return -ERESTARTSYS;
 768         if (gspca_dev->present)
 769                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 770         else
 771                 ret = -ENODEV;
 772         mutex_unlock(&gspca_dev->usb_lock);
 773
 774         return ret;
 775 }
 776 #endif
 777
 778 static int vidioc_g_chip_ident(struct file *file, void *priv,
 779                         struct v4l2_dbg_chip_ident *chip)
 780 {
 781         int ret;
 782         struct gspca_dev *gspca_dev = priv;
 783
 784         if (!gspca_dev->sd_desc->get_chip_ident)
 785                 return -EINVAL;
 786
 787         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 788                 return -ERESTARTSYS;
 789         if (gspca_dev->present)
 790                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 791         else
 792                 ret = -ENODEV;
 793         mutex_unlock(&gspca_dev->usb_lock);
 794
 795         return ret;
 796 }
 797
 798 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 799                                 struct v4l2_fmtdesc *fmtdesc)
 800 {
 801         struct gspca_dev *gspca_dev = priv;
 802         int i, j, index;
 803         __u32 fmt_tb[8];
 804
 805         /* give an index to each format */
 806         index = 0;
 807         j = 0;
 808         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 809                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 810                 j = 0;
 811                 for (;;) {
 812                         if (fmt_tb[j] == fmt_tb[index])
 813                                 break;
 814                         j++;
 815                 }
 816                 if (j == index) {
 817                         if (fmtdesc->index == index)
 818                                 break;          /* new format */
 819                         index++;
 820                         if (index >= ARRAY_SIZE(fmt_tb))
 821                                 return -EINVAL;
 822                 }
 823         }
 824         if (i < 0)
 825                 return -EINVAL;         /* no more format */
 826
 827         fmtdesc->pixelformat = fmt_tb[index];
 828         if (gspca_is_compressed(fmt_tb[index]))
 829                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 830         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 831         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 832         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 833         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 834         fmtdesc->description[4] = '\0';
 835         return 0;
 836 }
 837
 838 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 839                             struct v4l2_format *fmt)
 840 {
 841         struct gspca_dev *gspca_dev = priv;
 842         int mode;
 843
 844         mode = gspca_dev->curr_mode;
 845         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 846                 sizeof fmt->fmt.pix);
 847         return 0;
 848 }
 849
 850 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 851                         struct v4l2_format *fmt)
 852 {
 853         int w, h, mode, mode2;
 854
 855         w = fmt->fmt.pix.width;
 856         h = fmt->fmt.pix.height;
 857
 858 #ifdef GSPCA_DEBUG
 859         if (gspca_debug & D_CONF)
 860                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 861 #endif
 862         /* search the closest mode for width and height */
 863         mode = wxh_to_mode(gspca_dev, w, h);
 864
 865         /* OK if right palette */
 866         if (gspca_dev->cam.cam_mode[mode].pixelformat
 867                                                 != fmt->fmt.pix.pixelformat) {
 868
 869                 /* else, search the closest mode with the same pixel format */
 870                 mode2 = gspca_get_mode(gspca_dev, mode,
 871                                         fmt->fmt.pix.pixelformat);
 872                 if (mode2 >= 0)
 873                         mode = mode2;
 874 /*              else
 875                         ;                * no chance, return this mode */
 876         }
 877         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 878                 sizeof fmt->fmt.pix);
 879         return mode;                    /* used when s_fmt */
 880 }
 881
 882 static int vidioc_try_fmt_vid_cap(struct file *file,
 883                               void *priv,
 884                               struct v4l2_format *fmt)
 885 {
 886         struct gspca_dev *gspca_dev = priv;
 887         int ret;
 888
 889         ret = try_fmt_vid_cap(gspca_dev, fmt);
 890         if (ret < 0)
 891                 return ret;
 892         return 0;
 893 }
 894
 895 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 896                             struct v4l2_format *fmt)
 897 {
 898         struct gspca_dev *gspca_dev = priv;
 899         int ret;
 900
 901         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 902                 return -ERESTARTSYS;
 903
 904         ret = try_fmt_vid_cap(gspca_dev, fmt);
 905         if (ret < 0)
 906                 goto out;
 907
 908         if (gspca_dev->nframes != 0
 909             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 910                 ret = -EINVAL;
 911                 goto out;
 912         }
 913
 914         if (ret == gspca_dev->curr_mode) {
 915                 ret = 0;
 916                 goto out;                       /* same mode */
 917         }
 918
 919         if (gspca_dev->streaming) {
 920                 ret = -EBUSY;
 921                 goto out;
 922         }
 923         gspca_dev->width = fmt->fmt.pix.width;
 924         gspca_dev->height = fmt->fmt.pix.height;
 925         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 926         gspca_dev->curr_mode = ret;
 927
 928         ret = 0;
 929 out:
 930         mutex_unlock(&gspca_dev->queue_lock);
 931         return ret;
 932 }
 933
 934 static int vidioc_enum_framesizes(struct file *file, void *priv,
 935                                   struct v4l2_frmsizeenum *fsize)
 936 {
 937         struct gspca_dev *gspca_dev = priv;
 938         int i;
 939         __u32 index = 0;
 940
 941         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 942                 if (fsize->pixel_format !=
 943                                 gspca_dev->cam.cam_mode[i].pixelformat)
 944                         continue;
 945
 946                 if (fsize->index == index) {
 947                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 948                         fsize->discrete.width =
 949                                 gspca_dev->cam.cam_mode[i].width;
 950                         fsize->discrete.height =
 951                                 gspca_dev->cam.cam_mode[i].height;
 952                         return 0;
 953                 }
 954                 index++;
 955         }
 956
 957         return -EINVAL;
 958 }
 959
 960 static void gspca_release(struct video_device *vfd)
 961 {
 962         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 963
 964         PDEBUG(D_STREAM, "device released");
 965
 966         kfree(gspca_dev->usb_buf);
 967         kfree(gspca_dev);
 968 }
 969
 970 static int dev_open(struct file *file)
 971 {
 972         struct gspca_dev *gspca_dev;
 973         int ret;
 974
 975         PDEBUG(D_STREAM, "%s open", current->comm);
 976         gspca_dev = (struct gspca_dev *) video_devdata(file);
 977         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 978                 return -ERESTARTSYS;
 979         if (!gspca_dev->present) {
 980                 ret = -ENODEV;
 981                 goto out;
 982         }
 983
 984         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 985                 ret = -EBUSY;
 986                 goto out;
 987         }
 988
 989         /* protect the subdriver against rmmod */
 990         if (!try_module_get(gspca_dev->module)) {
 991                 ret = -ENODEV;
 992                 goto out;
 993         }
 994
 995         gspca_dev->users++;
 996
 997         file->private_data = gspca_dev;
 998 #ifdef GSPCA_DEBUG
 999         /* activate the v4l2 debug */
1000         if (gspca_debug & D_V4L2)
1001                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1002                                         | V4L2_DEBUG_IOCTL_ARG;
1003         else
1004                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1005                                         | V4L2_DEBUG_IOCTL_ARG);
1006 #endif
1007         ret = 0;
1008 out:
1009         mutex_unlock(&gspca_dev->queue_lock);
1010         if (ret != 0)
1011                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1012         else
1013                 PDEBUG(D_STREAM, "open done");
1014         return ret;
1015 }
1016
1017 static int dev_close(struct file *file)
1018 {
1019         struct gspca_dev *gspca_dev = file->private_data;
1020
1021         PDEBUG(D_STREAM, "%s close", current->comm);
1022         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1023                 return -ERESTARTSYS;
1024         gspca_dev->users--;
1025
1026         /* if the file did the capture, free the streaming resources */
1027         if (gspca_dev->capt_file == file) {
1028                 if (gspca_dev->streaming) {
1029                         mutex_lock(&gspca_dev->usb_lock);
1030                         gspca_stream_off(gspca_dev);
1031                         mutex_unlock(&gspca_dev->usb_lock);
1032                 }
1033                 frame_free(gspca_dev);
1034                 gspca_dev->capt_file = NULL;
1035                 gspca_dev->memory = GSPCA_MEMORY_NO;
1036         }
1037         file->private_data = NULL;
1038         module_put(gspca_dev->module);
1039         mutex_unlock(&gspca_dev->queue_lock);
1040
1041         PDEBUG(D_STREAM, "close done");
1042
1043         return 0;
1044 }
1045
1046 static int vidioc_querycap(struct file *file, void  *priv,
1047                            struct v4l2_capability *cap)
1048 {
1049         struct gspca_dev *gspca_dev = priv;
1050         int ret;
1051
1052         /* protect the access to the usb device */
1053         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1054                 return -ERESTARTSYS;
1055         if (!gspca_dev->present) {
1056                 ret = -ENODEV;
1057                 goto out;
1058         }
1059         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1060         if (gspca_dev->dev->product != NULL) {
1061                 strncpy(cap->card, gspca_dev->dev->product,
1062                         sizeof cap->card);
1063         } else {
1064                 snprintf(cap->card, sizeof cap->card,
1065                         "USB Camera (%04x:%04x)",
1066                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1067                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1068         }
1069         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1070         cap->version = DRIVER_VERSION_NUMBER;
1071         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1072                           | V4L2_CAP_STREAMING
1073                           | V4L2_CAP_READWRITE;
1074         ret = 0;
1075 out:
1076         mutex_unlock(&gspca_dev->usb_lock);
1077         return ret;
1078 }
1079
1080 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1081                                    int id)
1082 {
1083         const struct ctrl *ctrls;
1084         int i;
1085
1086         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1087              i < gspca_dev->sd_desc->nctrls;
1088              i++, ctrls++) {
1089                 if (gspca_dev->ctrl_dis & (1 << i))
1090                         continue;
1091                 if (id == ctrls->qctrl.id)
1092                         return ctrls;
1093         }
1094         return NULL;
1095 }
1096
1097 static int vidioc_queryctrl(struct file *file, void *priv,
1098                            struct v4l2_queryctrl *q_ctrl)
1099 {
1100         struct gspca_dev *gspca_dev = priv;
1101         const struct ctrl *ctrls;
1102         int i;
1103         u32 id;
1104
1105         ctrls = NULL;
1106         id = q_ctrl->id;
1107         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1108                 id &= V4L2_CTRL_ID_MASK;
1109                 id++;
1110                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1111                         if (gspca_dev->ctrl_dis & (1 << i))
1112                                 continue;
1113                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1114                                 continue;
1115                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1116                                             > ctrls->qctrl.id)
1117                                 continue;
1118                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1119                 }
1120         } else {
1121                 ctrls = get_ctrl(gspca_dev, id);
1122         }
1123         if (ctrls == NULL)
1124                 return -EINVAL;
1125         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1126         return 0;
1127 }
1128
1129 static int vidioc_s_ctrl(struct file *file, void *priv,
1130                          struct v4l2_control *ctrl)
1131 {
1132         struct gspca_dev *gspca_dev = priv;
1133         const struct ctrl *ctrls;
1134         int ret;
1135
1136         ctrls = get_ctrl(gspca_dev, ctrl->id);
1137         if (ctrls == NULL)
1138                 return -EINVAL;
1139
1140         if (ctrl->value < ctrls->qctrl.minimum
1141             || ctrl->value > ctrls->qctrl.maximum)
1142                 return -ERANGE;
1143         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1144         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1145                 return -ERESTARTSYS;
1146         if (gspca_dev->present)
1147                 ret = ctrls->set(gspca_dev, ctrl->value);
1148         else
1149                 ret = -ENODEV;
1150         mutex_unlock(&gspca_dev->usb_lock);
1151         return ret;
1152 }
1153
1154 static int vidioc_g_ctrl(struct file *file, void *priv,
1155                          struct v4l2_control *ctrl)
1156 {
1157         struct gspca_dev *gspca_dev = priv;
1158         const struct ctrl *ctrls;
1159         int ret;
1160
1161         ctrls = get_ctrl(gspca_dev, ctrl->id);
1162         if (ctrls == NULL)
1163                 return -EINVAL;
1164
1165         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1166                 return -ERESTARTSYS;
1167         if (gspca_dev->present)
1168                 ret = ctrls->get(gspca_dev, &ctrl->value);
1169         else
1170                 ret = -ENODEV;
1171         mutex_unlock(&gspca_dev->usb_lock);
1172         return ret;
1173 }
1174
1175 /*fixme: have an audio flag in gspca_dev?*/
1176 static int vidioc_s_audio(struct file *file, void *priv,
1177                          struct v4l2_audio *audio)
1178 {
1179         if (audio->index != 0)
1180                 return -EINVAL;
1181         return 0;
1182 }
1183
1184 static int vidioc_g_audio(struct file *file, void *priv,
1185                          struct v4l2_audio *audio)
1186 {
1187         strcpy(audio->name, "Microphone");
1188         return 0;
1189 }
1190
1191 static int vidioc_enumaudio(struct file *file, void *priv,
1192                          struct v4l2_audio *audio)
1193 {
1194         if (audio->index != 0)
1195                 return -EINVAL;
1196
1197         strcpy(audio->name, "Microphone");
1198         audio->capability = 0;
1199         audio->mode = 0;
1200         return 0;
1201 }
1202
1203 static int vidioc_querymenu(struct file *file, void *priv,
1204                             struct v4l2_querymenu *qmenu)
1205 {
1206         struct gspca_dev *gspca_dev = priv;
1207
1208         if (!gspca_dev->sd_desc->querymenu)
1209                 return -EINVAL;
1210         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1211 }
1212
1213 static int vidioc_enum_input(struct file *file, void *priv,
1214                                 struct v4l2_input *input)
1215 {
1216         struct gspca_dev *gspca_dev = priv;
1217
1218         if (input->index != 0)
1219                 return -EINVAL;
1220         input->type = V4L2_INPUT_TYPE_CAMERA;
1221         input->status = gspca_dev->cam.input_flags;
1222         strncpy(input->name, gspca_dev->sd_desc->name,
1223                 sizeof input->name);
1224         return 0;
1225 }
1226
1227 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1228 {
1229         *i = 0;
1230         return 0;
1231 }
1232
1233 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1234 {
1235         if (i > 0)
1236                 return -EINVAL;
1237         return (0);
1238 }
1239
1240 static int vidioc_reqbufs(struct file *file, void *priv,
1241                           struct v4l2_requestbuffers *rb)
1242 {
1243         struct gspca_dev *gspca_dev = priv;
1244         int i, ret = 0;
1245
1246         switch (rb->memory) {
1247         case GSPCA_MEMORY_READ:                 /* (internal call) */
1248         case V4L2_MEMORY_MMAP:
1249         case V4L2_MEMORY_USERPTR:
1250                 break;
1251         default:
1252                 return -EINVAL;
1253         }
1254         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1255                 return -ERESTARTSYS;
1256
1257         if (gspca_dev->memory != GSPCA_MEMORY_NO
1258             && gspca_dev->memory != rb->memory) {
1259                 ret = -EBUSY;
1260                 goto out;
1261         }
1262
1263         /* only one file may do the capture */
1264         if (gspca_dev->capt_file != NULL
1265             && gspca_dev->capt_file != file) {
1266                 ret = -EBUSY;
1267                 goto out;
1268         }
1269
1270         /* if allocated, the buffers must not be mapped */
1271         for (i = 0; i < gspca_dev->nframes; i++) {
1272                 if (gspca_dev->frame[i].vma_use_count) {
1273                         ret = -EBUSY;
1274                         goto out;
1275                 }
1276         }
1277
1278         /* stop streaming */
1279         if (gspca_dev->streaming) {
1280                 mutex_lock(&gspca_dev->usb_lock);
1281                 gspca_stream_off(gspca_dev);
1282                 mutex_unlock(&gspca_dev->usb_lock);
1283         }
1284
1285         /* free the previous allocated buffers, if any */
1286         if (gspca_dev->nframes != 0) {
1287                 frame_free(gspca_dev);
1288                 gspca_dev->capt_file = NULL;
1289         }
1290         if (rb->count == 0)                     /* unrequest */
1291                 goto out;
1292         gspca_dev->memory = rb->memory;
1293         ret = frame_alloc(gspca_dev, rb->count);
1294         if (ret == 0) {
1295                 rb->count = gspca_dev->nframes;
1296                 gspca_dev->capt_file = file;
1297         }
1298 out:
1299         mutex_unlock(&gspca_dev->queue_lock);
1300         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1301         return ret;
1302 }
1303
1304 static int vidioc_querybuf(struct file *file, void *priv,
1305                            struct v4l2_buffer *v4l2_buf)
1306 {
1307         struct gspca_dev *gspca_dev = priv;
1308         struct gspca_frame *frame;
1309
1310         if (v4l2_buf->index < 0
1311             || v4l2_buf->index >= gspca_dev->nframes)
1312                 return -EINVAL;
1313
1314         frame = &gspca_dev->frame[v4l2_buf->index];
1315         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1316         return 0;
1317 }
1318
1319 static int vidioc_streamon(struct file *file, void *priv,
1320                            enum v4l2_buf_type buf_type)
1321 {
1322         struct gspca_dev *gspca_dev = priv;
1323         int ret;
1324
1325         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1326                 return -EINVAL;
1327         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1328                 return -ERESTARTSYS;
1329
1330         if (gspca_dev->nframes == 0
1331             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1332                 ret = -EINVAL;
1333                 goto out;
1334         }
1335         if (!gspca_dev->streaming) {
1336                 ret = gspca_init_transfer(gspca_dev);
1337                 if (ret < 0)
1338                         goto out;
1339         }
1340 #ifdef GSPCA_DEBUG
1341         if (gspca_debug & D_STREAM) {
1342                 PDEBUG_MODE("stream on OK",
1343                         gspca_dev->pixfmt,
1344                         gspca_dev->width,
1345                         gspca_dev->height);
1346         }
1347 #endif
1348         ret = 0;
1349 out:
1350         mutex_unlock(&gspca_dev->queue_lock);
1351         return ret;
1352 }
1353
1354 static int vidioc_streamoff(struct file *file, void *priv,
1355                                 enum v4l2_buf_type buf_type)
1356 {
1357         struct gspca_dev *gspca_dev = priv;
1358         int i, ret;
1359
1360         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1361                 return -EINVAL;
1362         if (!gspca_dev->streaming)
1363                 return 0;
1364         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1365                 return -ERESTARTSYS;
1366
1367         /* stop streaming */
1368         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1369                 ret = -ERESTARTSYS;
1370                 goto out;
1371         }
1372         gspca_stream_off(gspca_dev);
1373         mutex_unlock(&gspca_dev->usb_lock);
1374
1375         /* empty the application queues */
1376         for (i = 0; i < gspca_dev->nframes; i++)
1377                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1378         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1379         gspca_dev->last_packet_type = DISCARD_PACKET;
1380         gspca_dev->sequence = 0;
1381         ret = 0;
1382 out:
1383         mutex_unlock(&gspca_dev->queue_lock);
1384         return ret;
1385 }
1386
1387 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1388                         struct v4l2_jpegcompression *jpegcomp)
1389 {
1390         struct gspca_dev *gspca_dev = priv;
1391         int ret;
1392
1393         if (!gspca_dev->sd_desc->get_jcomp)
1394                 return -EINVAL;
1395         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1396                 return -ERESTARTSYS;
1397         if (gspca_dev->present)
1398                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1399         else
1400                 ret = -ENODEV;
1401         mutex_unlock(&gspca_dev->usb_lock);
1402         return ret;
1403 }
1404
1405 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1406                         struct v4l2_jpegcompression *jpegcomp)
1407 {
1408         struct gspca_dev *gspca_dev = priv;
1409         int ret;
1410
1411         if (!gspca_dev->sd_desc->set_jcomp)
1412                 return -EINVAL;
1413         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1414                 return -ERESTARTSYS;
1415         if (gspca_dev->present)
1416                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1417         else
1418                 ret = -ENODEV;
1419         mutex_unlock(&gspca_dev->usb_lock);
1420         return ret;
1421 }
1422
1423 static int vidioc_g_parm(struct file *filp, void *priv,
1424                         struct v4l2_streamparm *parm)
1425 {
1426         struct gspca_dev *gspca_dev = priv;
1427
1428         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1429
1430         if (gspca_dev->sd_desc->get_streamparm) {
1431                 int ret;
1432
1433                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1434                         return -ERESTARTSYS;
1435                 if (gspca_dev->present)
1436                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1437                                                                  parm);
1438                 else
1439                         ret = -ENODEV;
1440                 mutex_unlock(&gspca_dev->usb_lock);
1441                 return ret;
1442         }
1443
1444         return 0;
1445 }
1446
1447 static int vidioc_s_parm(struct file *filp, void *priv,
1448                         struct v4l2_streamparm *parm)
1449 {
1450         struct gspca_dev *gspca_dev = priv;
1451         int n;
1452
1453         n = parm->parm.capture.readbuffers;
1454         if (n == 0 || n > GSPCA_MAX_FRAMES)
1455                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1456         else
1457                 gspca_dev->nbufread = n;
1458
1459         if (gspca_dev->sd_desc->set_streamparm) {
1460                 int ret;
1461
1462                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1463                         return -ERESTARTSYS;
1464                 if (gspca_dev->present)
1465                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1466                                                                  parm);
1467                 else
1468                         ret = -ENODEV;
1469                 mutex_unlock(&gspca_dev->usb_lock);
1470                 return ret;
1471         }
1472
1473         return 0;
1474 }
1475
1476 static int vidioc_s_std(struct file *filp, void *priv,
1477                         v4l2_std_id *parm)
1478 {
1479         return 0;
1480 }
1481
1482 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1483 static int vidiocgmbuf(struct file *file, void *priv,
1484                         struct video_mbuf *mbuf)
1485 {
1486         struct gspca_dev *gspca_dev = file->private_data;
1487         int i;
1488
1489         PDEBUG(D_STREAM, "cgmbuf");
1490         if (gspca_dev->nframes == 0) {
1491                 int ret;
1492
1493                 {
1494                         struct v4l2_format fmt;
1495
1496                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1497                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1498                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1499                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1500                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1501                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1502                         if (ret != 0)
1503                                 return ret;
1504                 }
1505                 {
1506                         struct v4l2_requestbuffers rb;
1507
1508                         memset(&rb, 0, sizeof rb);
1509                         rb.count = 4;
1510                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1511                         rb.memory = V4L2_MEMORY_MMAP;
1512                         ret = vidioc_reqbufs(file, priv, &rb);
1513                         if (ret != 0)
1514                                 return ret;
1515                 }
1516         }
1517         mbuf->frames = gspca_dev->nframes;
1518         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1519         for (i = 0; i < mbuf->frames; i++)
1520                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1521         return 0;
1522 }
1523 #endif
1524
1525 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1526 {
1527         struct gspca_dev *gspca_dev = file->private_data;
1528         struct gspca_frame *frame;
1529         struct page *page;
1530         unsigned long addr, start, size;
1531         int i, ret;
1532
1533         start = vma->vm_start;
1534         size = vma->vm_end - vma->vm_start;
1535         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1536
1537         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1538                 return -ERESTARTSYS;
1539         if (!gspca_dev->present) {
1540                 ret = -ENODEV;
1541                 goto out;
1542         }
1543         if (gspca_dev->capt_file != file) {
1544                 ret = -EINVAL;
1545                 goto out;
1546         }
1547
1548         frame = NULL;
1549         for (i = 0; i < gspca_dev->nframes; ++i) {
1550                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1551                         PDEBUG(D_STREAM, "mmap bad memory type");
1552                         break;
1553                 }
1554                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1555                                                 == vma->vm_pgoff) {
1556                         frame = &gspca_dev->frame[i];
1557                         break;
1558                 }
1559         }
1560         if (frame == NULL) {
1561                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1562                 ret = -EINVAL;
1563                 goto out;
1564         }
1565 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1566         /* v4l1 maps all the buffers */
1567         if (i != 0
1568             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1569 #endif
1570             if (size != frame->v4l2_buf.length) {
1571                 PDEBUG(D_STREAM, "mmap bad size");
1572                 ret = -EINVAL;
1573                 goto out;
1574         }
1575
1576         /*
1577          * - VM_IO marks the area as being a mmaped region for I/O to a
1578          *   device. It also prevents the region from being core dumped.
1579          */
1580         vma->vm_flags |= VM_IO;
1581
1582         addr = (unsigned long) frame->data;
1583         while (size > 0) {
1584                 page = vmalloc_to_page((void *) addr);
1585                 ret = vm_insert_page(vma, start, page);
1586                 if (ret < 0)
1587                         goto out;
1588                 start += PAGE_SIZE;
1589                 addr += PAGE_SIZE;
1590                 size -= PAGE_SIZE;
1591         }
1592
1593         vma->vm_ops = &gspca_vm_ops;
1594         vma->vm_private_data = frame;
1595         gspca_vm_open(vma);
1596         ret = 0;
1597 out:
1598         mutex_unlock(&gspca_dev->queue_lock);
1599         return ret;
1600 }
1601
1602 /*
1603  * wait for a video frame
1604  *
1605  * If a frame is ready, its index is returned.
1606  */
1607 static int frame_wait(struct gspca_dev *gspca_dev,
1608                         int nonblock_ing)
1609 {
1610         struct gspca_frame *frame;
1611         int i, j, ret;
1612
1613         /* check if a frame is ready */
1614         i = gspca_dev->fr_o;
1615         j = gspca_dev->fr_queue[i];
1616         frame = &gspca_dev->frame[j];
1617
1618         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1619                 if (nonblock_ing)
1620                         return -EAGAIN;
1621
1622                 /* wait till a frame is ready */
1623                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1624                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1625                         !gspca_dev->streaming || !gspca_dev->present,
1626                         msecs_to_jiffies(3000));
1627                 if (ret < 0)
1628                         return ret;
1629                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1630                         return -EIO;
1631         }
1632
1633         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1634         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1635                 gspca_dev->fr_q,
1636                 gspca_dev->fr_i,
1637                 gspca_dev->fr_o);
1638
1639         if (gspca_dev->sd_desc->dq_callback) {
1640                 mutex_lock(&gspca_dev->usb_lock);
1641                 if (gspca_dev->present)
1642                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1643                 mutex_unlock(&gspca_dev->usb_lock);
1644         }
1645         return j;
1646 }
1647
1648 /*
1649  * dequeue a video buffer
1650  *
1651  * If nonblock_ing is false, block until a buffer is available.
1652  */
1653 static int vidioc_dqbuf(struct file *file, void *priv,
1654                         struct v4l2_buffer *v4l2_buf)
1655 {
1656         struct gspca_dev *gspca_dev = priv;
1657         struct gspca_frame *frame;
1658         int i, ret;
1659
1660         PDEBUG(D_FRAM, "dqbuf");
1661         if (v4l2_buf->memory != gspca_dev->memory)
1662                 return -EINVAL;
1663
1664         if (!gspca_dev->present)
1665                 return -ENODEV;
1666
1667         /* if not streaming, be sure the application will not loop forever */
1668         if (!(file->f_flags & O_NONBLOCK)
1669             && !gspca_dev->streaming && gspca_dev->users == 1)
1670                 return -EINVAL;
1671
1672         /* only the capturing file may dequeue */
1673         if (gspca_dev->capt_file != file)
1674                 return -EINVAL;
1675
1676         /* only one dequeue / read at a time */
1677         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1678                 return -ERESTARTSYS;
1679
1680         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1681         if (ret < 0)
1682                 goto out;
1683         i = ret;                                /* frame index */
1684         frame = &gspca_dev->frame[i];
1685         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1686                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1687                                  frame->data,
1688                                  frame->v4l2_buf.bytesused)) {
1689                         PDEBUG(D_ERR|D_STREAM,
1690                                 "dqbuf cp to user failed");
1691                         ret = -EFAULT;
1692                         goto out;
1693                 }
1694         }
1695         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1696         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1697         PDEBUG(D_FRAM, "dqbuf %d", i);
1698         ret = 0;
1699 out:
1700         mutex_unlock(&gspca_dev->read_lock);
1701         return ret;
1702 }
1703
1704 /*
1705  * queue a video buffer
1706  *
1707  * Attempting to queue a buffer that has already been
1708  * queued will return -EINVAL.
1709  */
1710 static int vidioc_qbuf(struct file *file, void *priv,
1711                         struct v4l2_buffer *v4l2_buf)
1712 {
1713         struct gspca_dev *gspca_dev = priv;
1714         struct gspca_frame *frame;
1715         int i, index, ret;
1716
1717         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1718
1719         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1720                 return -ERESTARTSYS;
1721
1722         index = v4l2_buf->index;
1723         if ((unsigned) index >= gspca_dev->nframes) {
1724                 PDEBUG(D_FRAM,
1725                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1726                 ret = -EINVAL;
1727                 goto out;
1728         }
1729         if (v4l2_buf->memory != gspca_dev->memory) {
1730                 PDEBUG(D_FRAM, "qbuf bad memory type");
1731                 ret = -EINVAL;
1732                 goto out;
1733         }
1734
1735         frame = &gspca_dev->frame[index];
1736         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1737                 PDEBUG(D_FRAM, "qbuf bad state");
1738                 ret = -EINVAL;
1739                 goto out;
1740         }
1741
1742         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1743
1744         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1745                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1746                 frame->v4l2_buf.length = v4l2_buf->length;
1747         }
1748
1749         /* put the buffer in the 'queued' queue */
1750         i = gspca_dev->fr_q;
1751         gspca_dev->fr_queue[i] = index;
1752         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1753         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1754                 gspca_dev->fr_q,
1755                 gspca_dev->fr_i,
1756                 gspca_dev->fr_o);
1757
1758         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1759         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1760         ret = 0;
1761 out:
1762         mutex_unlock(&gspca_dev->queue_lock);
1763         return ret;
1764 }
1765
1766 /*
1767  * allocate the resources for read()
1768  */
1769 static int read_alloc(struct gspca_dev *gspca_dev,
1770                         struct file *file)
1771 {
1772         struct v4l2_buffer v4l2_buf;
1773         int i, ret;
1774
1775         PDEBUG(D_STREAM, "read alloc");
1776         if (gspca_dev->nframes == 0) {
1777                 struct v4l2_requestbuffers rb;
1778
1779                 memset(&rb, 0, sizeof rb);
1780                 rb.count = gspca_dev->nbufread;
1781                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1782                 rb.memory = GSPCA_MEMORY_READ;
1783                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1784                 if (ret != 0) {
1785                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1786                         return ret;
1787                 }
1788                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1789                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1790                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1791                 for (i = 0; i < gspca_dev->nbufread; i++) {
1792                         v4l2_buf.index = i;
1793                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1794                         if (ret != 0) {
1795                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1796                                 return ret;
1797                         }
1798                 }
1799                 gspca_dev->memory = GSPCA_MEMORY_READ;
1800         }
1801
1802         /* start streaming */
1803         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1804         if (ret != 0)
1805                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1806         return ret;
1807 }
1808
1809 static unsigned int dev_poll(struct file *file, poll_table *wait)
1810 {
1811         struct gspca_dev *gspca_dev = file->private_data;
1812         int i, ret;
1813
1814         PDEBUG(D_FRAM, "poll");
1815
1816         poll_wait(file, &gspca_dev->wq, wait);
1817
1818         /* if reqbufs is not done, the user would use read() */
1819         if (gspca_dev->nframes == 0) {
1820                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1821                         return POLLERR;         /* not the 1st time */
1822                 ret = read_alloc(gspca_dev, file);
1823                 if (ret != 0)
1824                         return POLLERR;
1825         }
1826
1827         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1828                 return POLLERR;
1829
1830         /* check the next incoming buffer */
1831         i = gspca_dev->fr_o;
1832         i = gspca_dev->fr_queue[i];
1833         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1834                 ret = POLLIN | POLLRDNORM;      /* something to read */
1835         else
1836                 ret = 0;
1837         mutex_unlock(&gspca_dev->queue_lock);
1838         if (!gspca_dev->present)
1839                 return POLLHUP;
1840         return ret;
1841 }
1842
1843 static ssize_t dev_read(struct file *file, char __user *data,
1844                     size_t count, loff_t *ppos)
1845 {
1846         struct gspca_dev *gspca_dev = file->private_data;
1847         struct gspca_frame *frame;
1848         struct v4l2_buffer v4l2_buf;
1849         struct timeval timestamp;
1850         int n, ret, ret2;
1851
1852         PDEBUG(D_FRAM, "read (%zd)", count);
1853         if (!gspca_dev->present)
1854                 return -ENODEV;
1855         switch (gspca_dev->memory) {
1856         case GSPCA_MEMORY_NO:                   /* first time */
1857                 ret = read_alloc(gspca_dev, file);
1858                 if (ret != 0)
1859                         return ret;
1860                 break;
1861         case GSPCA_MEMORY_READ:
1862                 if (gspca_dev->capt_file == file)
1863                         break;
1864                 /* fall thru */
1865         default:
1866                 return -EINVAL;
1867         }
1868
1869         /* get a frame */
1870         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1871         timestamp.tv_sec--;
1872         n = 2;
1873         for (;;) {
1874                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1875                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1876                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1877                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1878                 if (ret != 0) {
1879                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1880                         return ret;
1881                 }
1882
1883                 /* if the process slept for more than 1 second,
1884                  * get a newer frame */
1885                 frame = &gspca_dev->frame[v4l2_buf.index];
1886                 if (--n < 0)
1887                         break;                  /* avoid infinite loop */
1888                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1889                         break;
1890                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1891                 if (ret != 0) {
1892                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1893                         return ret;
1894                 }
1895         }
1896
1897         /* copy the frame */
1898         if (count > frame->v4l2_buf.bytesused)
1899                 count = frame->v4l2_buf.bytesused;
1900         ret = copy_to_user(data, frame->data, count);
1901         if (ret != 0) {
1902                 PDEBUG(D_ERR|D_STREAM,
1903                         "read cp to user lack %d / %zd", ret, count);
1904                 ret = -EFAULT;
1905                 goto out;
1906         }
1907         ret = count;
1908 out:
1909         /* in each case, requeue the buffer */
1910         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1911         if (ret2 != 0)
1912                 return ret2;
1913         return ret;
1914 }
1915
1916 static struct v4l2_file_operations dev_fops = {
1917         .owner = THIS_MODULE,
1918         .open = dev_open,
1919         .release = dev_close,
1920         .read = dev_read,
1921         .mmap = dev_mmap,
1922         .unlocked_ioctl = video_ioctl2,
1923         .poll   = dev_poll,
1924 };
1925
1926 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1927         .vidioc_querycap        = vidioc_querycap,
1928         .vidioc_dqbuf           = vidioc_dqbuf,
1929         .vidioc_qbuf            = vidioc_qbuf,
1930         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1931         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1932         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1933         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1934         .vidioc_streamon        = vidioc_streamon,
1935         .vidioc_queryctrl       = vidioc_queryctrl,
1936         .vidioc_g_ctrl          = vidioc_g_ctrl,
1937         .vidioc_s_ctrl          = vidioc_s_ctrl,
1938         .vidioc_g_audio         = vidioc_g_audio,
1939         .vidioc_s_audio         = vidioc_s_audio,
1940         .vidioc_enumaudio       = vidioc_enumaudio,
1941         .vidioc_querymenu       = vidioc_querymenu,
1942         .vidioc_enum_input      = vidioc_enum_input,
1943         .vidioc_g_input         = vidioc_g_input,
1944         .vidioc_s_input         = vidioc_s_input,
1945         .vidioc_reqbufs         = vidioc_reqbufs,
1946         .vidioc_querybuf        = vidioc_querybuf,
1947         .vidioc_streamoff       = vidioc_streamoff,
1948         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1949         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1950         .vidioc_g_parm          = vidioc_g_parm,
1951         .vidioc_s_parm          = vidioc_s_parm,
1952         .vidioc_s_std           = vidioc_s_std,
1953         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1954 #ifdef CONFIG_VIDEO_ADV_DEBUG
1955         .vidioc_g_register      = vidioc_g_register,
1956         .vidioc_s_register      = vidioc_s_register,
1957 #endif
1958         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1959 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1960         .vidiocgmbuf          = vidiocgmbuf,
1961 #endif
1962 };
1963
1964 static struct video_device gspca_template = {
1965         .name = "gspca main driver",
1966         .fops = &dev_fops,
1967         .ioctl_ops = &dev_ioctl_ops,
1968         .release = gspca_release,
1969         .minor = -1,
1970 };
1971
1972 /*
1973  * probe and create a new gspca device
1974  *
1975  * This function must be called by the sub-driver when it is
1976  * called for probing a new device.
1977  */
1978 int gspca_dev_probe(struct usb_interface *intf,
1979                 const struct usb_device_id *id,
1980                 const struct sd_desc *sd_desc,
1981                 int dev_size,
1982                 struct module *module)
1983 {
1984         struct usb_interface_descriptor *interface;
1985         struct gspca_dev *gspca_dev;
1986         struct usb_device *dev = interface_to_usbdev(intf);
1987         int ret;
1988
1989         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1990
1991         /* we don't handle multi-config cameras */
1992         if (dev->descriptor.bNumConfigurations != 1)
1993                 return -ENODEV;
1994         interface = &intf->cur_altsetting->desc;
1995         if (interface->bInterfaceNumber > 0)
1996                 return -ENODEV;
1997
1998         /* create the device */
1999         if (dev_size < sizeof *gspca_dev)
2000                 dev_size = sizeof *gspca_dev;
2001         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2002         if (!gspca_dev) {
2003                 err("couldn't kzalloc gspca struct");
2004                 return -ENOMEM;
2005         }
2006         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2007         if (!gspca_dev->usb_buf) {
2008                 err("out of memory");
2009                 ret = -ENOMEM;
2010                 goto out;
2011         }
2012         gspca_dev->dev = dev;
2013         gspca_dev->iface = interface->bInterfaceNumber;
2014         gspca_dev->nbalt = intf->num_altsetting;
2015         gspca_dev->sd_desc = sd_desc;
2016         gspca_dev->nbufread = 2;
2017         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2018
2019         /* configure the subdriver and initialize the USB device */
2020         ret = sd_desc->config(gspca_dev, id);
2021         if (ret < 0)
2022                 goto out;
2023         ret = sd_desc->init(gspca_dev);
2024         if (ret < 0)
2025                 goto out;
2026         ret = gspca_set_alt0(gspca_dev);
2027         if (ret < 0)
2028                 goto out;
2029         gspca_set_default_mode(gspca_dev);
2030
2031         mutex_init(&gspca_dev->usb_lock);
2032         mutex_init(&gspca_dev->read_lock);
2033         mutex_init(&gspca_dev->queue_lock);
2034         init_waitqueue_head(&gspca_dev->wq);
2035
2036         /* init video stuff */
2037         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2038         gspca_dev->vdev.parent = &intf->dev;
2039         gspca_dev->module = module;
2040         gspca_dev->present = 1;
2041         ret = video_register_device(&gspca_dev->vdev,
2042                                   VFL_TYPE_GRABBER,
2043                                   -1);
2044         if (ret < 0) {
2045                 err("video_register_device err %d", ret);
2046                 goto out;
2047         }
2048
2049         usb_set_intfdata(intf, gspca_dev);
2050         PDEBUG(D_PROBE, "probe ok");
2051         return 0;
2052 out:
2053         kfree(gspca_dev->usb_buf);
2054         kfree(gspca_dev);
2055         return ret;
2056 }
2057 EXPORT_SYMBOL(gspca_dev_probe);
2058
2059 /*
2060  * USB disconnection
2061  *
2062  * This function must be called by the sub-driver
2063  * when the device disconnects, after the specific resources are freed.
2064  */
2065 void gspca_disconnect(struct usb_interface *intf)
2066 {
2067         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2068
2069         mutex_lock(&gspca_dev->usb_lock);
2070         gspca_dev->present = 0;
2071
2072         if (gspca_dev->streaming) {
2073                 destroy_urbs(gspca_dev);
2074                 wake_up_interruptible(&gspca_dev->wq);
2075         }
2076
2077         /* the device is freed at exit of this function */
2078         gspca_dev->dev = NULL;
2079         mutex_unlock(&gspca_dev->usb_lock);
2080
2081         usb_set_intfdata(intf, NULL);
2082
2083         /* release the device */
2084         /* (this will call gspca_release() immediatly or on last close) */
2085         video_unregister_device(&gspca_dev->vdev);
2086
2087         PDEBUG(D_PROBE, "disconnect complete");
2088 }
2089 EXPORT_SYMBOL(gspca_disconnect);
2090
2091 #ifdef CONFIG_PM
2092 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2093 {
2094         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2095
2096         if (!gspca_dev->streaming)
2097                 return 0;
2098         gspca_dev->frozen = 1;          /* avoid urb error messages */
2099         if (gspca_dev->sd_desc->stopN)
2100                 gspca_dev->sd_desc->stopN(gspca_dev);
2101         destroy_urbs(gspca_dev);
2102         gspca_set_alt0(gspca_dev);
2103         if (gspca_dev->sd_desc->stop0)
2104                 gspca_dev->sd_desc->stop0(gspca_dev);
2105         return 0;
2106 }
2107 EXPORT_SYMBOL(gspca_suspend);
2108
2109 int gspca_resume(struct usb_interface *intf)
2110 {
2111         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2112
2113         gspca_dev->frozen = 0;
2114         gspca_dev->sd_desc->init(gspca_dev);
2115         if (gspca_dev->streaming)
2116                 return gspca_init_transfer(gspca_dev);
2117         return 0;
2118 }
2119 EXPORT_SYMBOL(gspca_resume);
2120 #endif
2121 /* -- cam driver utility functions -- */
2122
2123 /* auto gain and exposure algorithm based on the knee algorithm described here:
2124    http://ytse.tricolour.net/docs/LowLightOptimization.html
2125
2126    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2127    where changed. */
2128 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2129         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2130 {
2131         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2132         const struct ctrl *gain_ctrl = NULL;
2133         const struct ctrl *exposure_ctrl = NULL;
2134         const struct ctrl *autogain_ctrl = NULL;
2135         int retval = 0;
2136
2137         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2138                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2139                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2140                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2141                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2142                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2143                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2144         }
2145         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2146                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2147                         "on cam without (auto)gain/exposure");
2148                 return 0;
2149         }
2150
2151         if (gain_ctrl->get(gspca_dev, &gain) ||
2152                         exposure_ctrl->get(gspca_dev, &exposure) ||
2153                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2154                 return 0;
2155
2156         orig_gain = gain;
2157         orig_exposure = exposure;
2158
2159         /* If we are of a multiple of deadzone, do multiple steps to reach the
2160            desired lumination fast (with the risc of a slight overshoot) */
2161         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2162
2163         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2164                 avg_lum, desired_avg_lum, steps);
2165
2166         for (i = 0; i < steps; i++) {
2167                 if (avg_lum > desired_avg_lum) {
2168                         if (gain > gain_knee)
2169                                 gain--;
2170                         else if (exposure > exposure_knee)
2171                                 exposure--;
2172                         else if (gain > gain_ctrl->qctrl.default_value)
2173                                 gain--;
2174                         else if (exposure > exposure_ctrl->qctrl.minimum)
2175                                 exposure--;
2176                         else if (gain > gain_ctrl->qctrl.minimum)
2177                                 gain--;
2178                         else
2179                                 break;
2180                 } else {
2181                         if (gain < gain_ctrl->qctrl.default_value)
2182                                 gain++;
2183                         else if (exposure < exposure_knee)
2184                                 exposure++;
2185                         else if (gain < gain_knee)
2186                                 gain++;
2187                         else if (exposure < exposure_ctrl->qctrl.maximum)
2188                                 exposure++;
2189                         else if (gain < gain_ctrl->qctrl.maximum)
2190                                 gain++;
2191                         else
2192                                 break;
2193                 }
2194         }
2195
2196         if (gain != orig_gain) {
2197                 gain_ctrl->set(gspca_dev, gain);
2198                 retval = 1;
2199         }
2200         if (exposure != orig_exposure) {
2201                 exposure_ctrl->set(gspca_dev, exposure);
2202                 retval = 1;
2203         }
2204
2205         return retval;
2206 }
2207 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2208
2209 /* -- module insert / remove -- */
2210 static int __init gspca_init(void)
2211 {
2212         info("main v%d.%d.%d registered",
2213                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2214                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2215                 DRIVER_VERSION_NUMBER & 0xff);
2216         return 0;
2217 }
2218 static void __exit gspca_exit(void)
2219 {
2220         info("main deregistered");
2221 }
2222
2223 module_init(gspca_init);
2224 module_exit(gspca_exit);
2225
2226 #ifdef GSPCA_DEBUG
2227 module_param_named(debug, gspca_debug, int, 0644);
2228 MODULE_PARM_DESC(debug,
2229                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2230                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2231                 " 0x0100: v4l2");
2232 #endif