SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * 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                 if (gspca_dev->pkt_size == 0)
 516                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 517                 else
 518                         psize = gspca_dev->pkt_size;
 519                 npkt = gspca_dev->cam.npkt;
 520                 if (npkt == 0)
 521                         npkt = 32;              /* default value */
 522                 bsize = psize * npkt;
 523                 PDEBUG(D_STREAM,
 524                         "isoc %d pkts size %d = bsize:%d",
 525                         npkt, psize, bsize);
 526                 nurbs = DEF_NURBS;
 527         } else {                                /* bulk */
 528                 npkt = 0;
 529                 bsize = gspca_dev->cam.bulk_size;
 530                 if (bsize == 0)
 531                         bsize = psize;
 532                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 533                 if (gspca_dev->cam.bulk_nurbs != 0)
 534                         nurbs = gspca_dev->cam.bulk_nurbs;
 535                 else
 536                         nurbs = 1;
 537         }
 538
 539         gspca_dev->nurbs = nurbs;
 540         for (n = 0; n < nurbs; n++) {
 541                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 542                 if (!urb) {
 543                         err("usb_alloc_urb failed");
 544                         destroy_urbs(gspca_dev);
 545                         return -ENOMEM;
 546                 }
 547                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 548                                                 bsize,
 549                                                 GFP_KERNEL,
 550                                                 &urb->transfer_dma);
 551
 552                 if (urb->transfer_buffer == NULL) {
 553                         usb_free_urb(urb);
 554                         err("usb_buffer_urb failed");
 555                         destroy_urbs(gspca_dev);
 556                         return -ENOMEM;
 557                 }
 558                 gspca_dev->urb[n] = urb;
 559                 urb->dev = gspca_dev->dev;
 560                 urb->context = gspca_dev;
 561                 urb->transfer_buffer_length = bsize;
 562                 if (npkt != 0) {                /* ISOC */
 563                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 564                                                     ep->desc.bEndpointAddress);
 565                         urb->transfer_flags = URB_ISO_ASAP
 566                                         | URB_NO_TRANSFER_DMA_MAP;
 567                         urb->interval = ep->desc.bInterval;
 568                         urb->complete = isoc_irq;
 569                         urb->number_of_packets = npkt;
 570                         for (i = 0; i < npkt; i++) {
 571                                 urb->iso_frame_desc[i].length = psize;
 572                                 urb->iso_frame_desc[i].offset = psize * i;
 573                         }
 574                 } else {                /* bulk */
 575                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 576                                                 ep->desc.bEndpointAddress),
 577                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 578                         urb->complete = bulk_irq;
 579                 }
 580         }
 581         return 0;
 582 }
 583
 584 /*
 585  * start the USB transfer
 586  */
 587 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 588 {
 589         struct usb_host_endpoint *ep;
 590         int n, ret;
 591
 592         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 593                 return -ERESTARTSYS;
 594
 595         if (!gspca_dev->present) {
 596                 ret = -ENODEV;
 597                 goto out;
 598         }
 599
 600         /* set the higher alternate setting and
 601          * loop until urb submit succeeds */
 602         gspca_dev->alt = gspca_dev->nbalt;
 603         if (gspca_dev->sd_desc->isoc_init) {
 604                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 605                 if (ret < 0)
 606                         goto out;
 607         }
 608         ep = get_ep(gspca_dev);
 609         if (ep == NULL) {
 610                 ret = -EIO;
 611                 goto out;
 612         }
 613         for (;;) {
 614                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 615                 ret = create_urbs(gspca_dev, ep);
 616                 if (ret < 0)
 617                         goto out;
 618
 619                 /* clear the bulk endpoint */
 620                 if (gspca_dev->cam.bulk)
 621                         usb_clear_halt(gspca_dev->dev,
 622                                         gspca_dev->urb[0]->pipe);
 623
 624                 /* start the cam */
 625                 ret = gspca_dev->sd_desc->start(gspca_dev);
 626                 if (ret < 0) {
 627                         destroy_urbs(gspca_dev);
 628                         goto out;
 629                 }
 630                 gspca_dev->streaming = 1;
 631
 632                 /* some bulk transfers are started by the subdriver */
 633                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 634                         break;
 635
 636                 /* submit the URBs */
 637                 for (n = 0; n < gspca_dev->nurbs; n++) {
 638                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 639                         if (ret < 0)
 640                                 break;
 641                 }
 642                 if (ret >= 0)
 643                         break;
 644                 PDEBUG(D_ERR|D_STREAM,
 645                         "usb_submit_urb alt %d err %d", gspca_dev->alt, ret);
 646                 gspca_dev->streaming = 0;
 647                 destroy_urbs(gspca_dev);
 648                 if (ret != -ENOSPC)
 649                         goto out;
 650
 651                 /* the bandwidth is not wide enough
 652                  * negociate or try a lower alternate setting */
 653                 msleep(20);     /* wait for kill complete */
 654                 if (gspca_dev->sd_desc->isoc_nego) {
 655                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 656                         if (ret < 0)
 657                                 goto out;
 658                 } else {
 659                         ep = get_ep(gspca_dev);
 660                         if (ep == NULL) {
 661                                 ret = -EIO;
 662                                 goto out;
 663                         }
 664                 }
 665         }
 666 out:
 667         mutex_unlock(&gspca_dev->usb_lock);
 668         return ret;
 669 }
 670
 671 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 672 {
 673         int ret;
 674
 675         if (gspca_dev->alt == 0)
 676                 return 0;
 677         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 678         if (ret < 0)
 679                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 680         return ret;
 681 }
 682
 683 /* Note: both the queue and the usb locks should be held when calling this */
 684 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 685 {
 686         gspca_dev->streaming = 0;
 687         if (gspca_dev->present) {
 688                 if (gspca_dev->sd_desc->stopN)
 689                         gspca_dev->sd_desc->stopN(gspca_dev);
 690                 destroy_urbs(gspca_dev);
 691                 gspca_set_alt0(gspca_dev);
 692         }
 693
 694         /* always call stop0 to free the subdriver's resources */
 695         if (gspca_dev->sd_desc->stop0)
 696                 gspca_dev->sd_desc->stop0(gspca_dev);
 697         PDEBUG(D_STREAM, "stream off OK");
 698 }
 699
 700 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 701 {
 702         int i;
 703
 704         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 705         gspca_dev->curr_mode = i;
 706         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 707         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 708         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 709 }
 710
 711 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 712                         int width, int height)
 713 {
 714         int i;
 715
 716         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 717                 if (width >= gspca_dev->cam.cam_mode[i].width
 718                     && height >= gspca_dev->cam.cam_mode[i].height)
 719                         break;
 720         }
 721         return i;
 722 }
 723
 724 /*
 725  * search a mode with the right pixel format
 726  */
 727 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 728                         int mode,
 729                         int pixfmt)
 730 {
 731         int modeU, modeD;
 732
 733         modeU = modeD = mode;
 734         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 735                 if (--modeD >= 0) {
 736                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 737                                                                 == pixfmt)
 738                                 return modeD;
 739                 }
 740                 if (++modeU < gspca_dev->cam.nmodes) {
 741                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 742                                                                 == pixfmt)
 743                                 return modeU;
 744                 }
 745         }
 746         return -EINVAL;
 747 }
 748
 749 #ifdef CONFIG_VIDEO_ADV_DEBUG
 750 static int vidioc_g_register(struct file *file, void *priv,
 751                         struct v4l2_dbg_register *reg)
 752 {
 753         int ret;
 754         struct gspca_dev *gspca_dev = priv;
 755
 756         if (!gspca_dev->sd_desc->get_chip_ident)
 757                 return -EINVAL;
 758
 759         if (!gspca_dev->sd_desc->get_register)
 760                 return -EINVAL;
 761
 762         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 763                 return -ERESTARTSYS;
 764         if (gspca_dev->present)
 765                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 766         else
 767                 ret = -ENODEV;
 768         mutex_unlock(&gspca_dev->usb_lock);
 769
 770         return ret;
 771 }
 772
 773 static int vidioc_s_register(struct file *file, void *priv,
 774                         struct v4l2_dbg_register *reg)
 775 {
 776         int ret;
 777         struct gspca_dev *gspca_dev = priv;
 778
 779         if (!gspca_dev->sd_desc->get_chip_ident)
 780                 return -EINVAL;
 781
 782         if (!gspca_dev->sd_desc->set_register)
 783                 return -EINVAL;
 784
 785         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 786                 return -ERESTARTSYS;
 787         if (gspca_dev->present)
 788                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 789         else
 790                 ret = -ENODEV;
 791         mutex_unlock(&gspca_dev->usb_lock);
 792
 793         return ret;
 794 }
 795 #endif
 796
 797 static int vidioc_g_chip_ident(struct file *file, void *priv,
 798                         struct v4l2_dbg_chip_ident *chip)
 799 {
 800         int ret;
 801         struct gspca_dev *gspca_dev = priv;
 802
 803         if (!gspca_dev->sd_desc->get_chip_ident)
 804                 return -EINVAL;
 805
 806         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 807                 return -ERESTARTSYS;
 808         if (gspca_dev->present)
 809                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 810         else
 811                 ret = -ENODEV;
 812         mutex_unlock(&gspca_dev->usb_lock);
 813
 814         return ret;
 815 }
 816
 817 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 818                                 struct v4l2_fmtdesc *fmtdesc)
 819 {
 820         struct gspca_dev *gspca_dev = priv;
 821         int i, j, index;
 822         __u32 fmt_tb[8];
 823
 824         /* give an index to each format */
 825         index = 0;
 826         j = 0;
 827         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 828                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 829                 j = 0;
 830                 for (;;) {
 831                         if (fmt_tb[j] == fmt_tb[index])
 832                                 break;
 833                         j++;
 834                 }
 835                 if (j == index) {
 836                         if (fmtdesc->index == index)
 837                                 break;          /* new format */
 838                         index++;
 839                         if (index >= ARRAY_SIZE(fmt_tb))
 840                                 return -EINVAL;
 841                 }
 842         }
 843         if (i < 0)
 844                 return -EINVAL;         /* no more format */
 845
 846         fmtdesc->pixelformat = fmt_tb[index];
 847         if (gspca_is_compressed(fmt_tb[index]))
 848                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 849         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 850         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 851         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 852         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 853         fmtdesc->description[4] = '\0';
 854         return 0;
 855 }
 856
 857 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 858                             struct v4l2_format *fmt)
 859 {
 860         struct gspca_dev *gspca_dev = priv;
 861         int mode;
 862
 863         mode = gspca_dev->curr_mode;
 864         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 865                 sizeof fmt->fmt.pix);
 866         return 0;
 867 }
 868
 869 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 870                         struct v4l2_format *fmt)
 871 {
 872         int w, h, mode, mode2;
 873
 874         w = fmt->fmt.pix.width;
 875         h = fmt->fmt.pix.height;
 876
 877 #ifdef GSPCA_DEBUG
 878         if (gspca_debug & D_CONF)
 879                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 880 #endif
 881         /* search the closest mode for width and height */
 882         mode = wxh_to_mode(gspca_dev, w, h);
 883
 884         /* OK if right palette */
 885         if (gspca_dev->cam.cam_mode[mode].pixelformat
 886                                                 != fmt->fmt.pix.pixelformat) {
 887
 888                 /* else, search the closest mode with the same pixel format */
 889                 mode2 = gspca_get_mode(gspca_dev, mode,
 890                                         fmt->fmt.pix.pixelformat);
 891                 if (mode2 >= 0)
 892                         mode = mode2;
 893 /*              else
 894                         ;                * no chance, return this mode */
 895         }
 896         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 897                 sizeof fmt->fmt.pix);
 898         return mode;                    /* used when s_fmt */
 899 }
 900
 901 static int vidioc_try_fmt_vid_cap(struct file *file,
 902                               void *priv,
 903                               struct v4l2_format *fmt)
 904 {
 905         struct gspca_dev *gspca_dev = priv;
 906         int ret;
 907
 908         ret = try_fmt_vid_cap(gspca_dev, fmt);
 909         if (ret < 0)
 910                 return ret;
 911         return 0;
 912 }
 913
 914 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 915                             struct v4l2_format *fmt)
 916 {
 917         struct gspca_dev *gspca_dev = priv;
 918         int ret;
 919
 920         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 921                 return -ERESTARTSYS;
 922
 923         ret = try_fmt_vid_cap(gspca_dev, fmt);
 924         if (ret < 0)
 925                 goto out;
 926
 927         if (gspca_dev->nframes != 0
 928             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 929                 ret = -EINVAL;
 930                 goto out;
 931         }
 932
 933         if (ret == gspca_dev->curr_mode) {
 934                 ret = 0;
 935                 goto out;                       /* same mode */
 936         }
 937
 938         if (gspca_dev->streaming) {
 939                 ret = -EBUSY;
 940                 goto out;
 941         }
 942         gspca_dev->width = fmt->fmt.pix.width;
 943         gspca_dev->height = fmt->fmt.pix.height;
 944         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 945         gspca_dev->curr_mode = ret;
 946
 947         ret = 0;
 948 out:
 949         mutex_unlock(&gspca_dev->queue_lock);
 950         return ret;
 951 }
 952
 953 static int vidioc_enum_framesizes(struct file *file, void *priv,
 954                                   struct v4l2_frmsizeenum *fsize)
 955 {
 956         struct gspca_dev *gspca_dev = priv;
 957         int i;
 958         __u32 index = 0;
 959
 960         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 961                 if (fsize->pixel_format !=
 962                                 gspca_dev->cam.cam_mode[i].pixelformat)
 963                         continue;
 964
 965                 if (fsize->index == index) {
 966                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 967                         fsize->discrete.width =
 968                                 gspca_dev->cam.cam_mode[i].width;
 969                         fsize->discrete.height =
 970                                 gspca_dev->cam.cam_mode[i].height;
 971                         return 0;
 972                 }
 973                 index++;
 974         }
 975
 976         return -EINVAL;
 977 }
 978
 979 static void gspca_release(struct video_device *vfd)
 980 {
 981         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 982
 983         PDEBUG(D_STREAM, "device released");
 984
 985         kfree(gspca_dev->usb_buf);
 986         kfree(gspca_dev);
 987 }
 988
 989 static int dev_open(struct file *file)
 990 {
 991         struct gspca_dev *gspca_dev;
 992         int ret;
 993
 994         PDEBUG(D_STREAM, "%s open", current->comm);
 995         gspca_dev = (struct gspca_dev *) video_devdata(file);
 996         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 997                 return -ERESTARTSYS;
 998         if (!gspca_dev->present) {
 999                 ret = -ENODEV;
1000                 goto out;
1001         }
1002
1003         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1004                 ret = -EBUSY;
1005                 goto out;
1006         }
1007
1008         /* protect the subdriver against rmmod */
1009         if (!try_module_get(gspca_dev->module)) {
1010                 ret = -ENODEV;
1011                 goto out;
1012         }
1013
1014         gspca_dev->users++;
1015
1016         file->private_data = gspca_dev;
1017 #ifdef GSPCA_DEBUG
1018         /* activate the v4l2 debug */
1019         if (gspca_debug & D_V4L2)
1020                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1021                                         | V4L2_DEBUG_IOCTL_ARG;
1022         else
1023                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1024                                         | V4L2_DEBUG_IOCTL_ARG);
1025 #endif
1026         ret = 0;
1027 out:
1028         mutex_unlock(&gspca_dev->queue_lock);
1029         if (ret != 0)
1030                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1031         else
1032                 PDEBUG(D_STREAM, "open done");
1033         return ret;
1034 }
1035
1036 static int dev_close(struct file *file)
1037 {
1038         struct gspca_dev *gspca_dev = file->private_data;
1039
1040         PDEBUG(D_STREAM, "%s close", current->comm);
1041         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1042                 return -ERESTARTSYS;
1043         gspca_dev->users--;
1044
1045         /* if the file did the capture, free the streaming resources */
1046         if (gspca_dev->capt_file == file) {
1047                 if (gspca_dev->streaming) {
1048                         mutex_lock(&gspca_dev->usb_lock);
1049                         gspca_stream_off(gspca_dev);
1050                         mutex_unlock(&gspca_dev->usb_lock);
1051                 }
1052                 frame_free(gspca_dev);
1053                 gspca_dev->capt_file = NULL;
1054                 gspca_dev->memory = GSPCA_MEMORY_NO;
1055         }
1056         file->private_data = NULL;
1057         module_put(gspca_dev->module);
1058         mutex_unlock(&gspca_dev->queue_lock);
1059
1060         PDEBUG(D_STREAM, "close done");
1061
1062         return 0;
1063 }
1064
1065 static int vidioc_querycap(struct file *file, void  *priv,
1066                            struct v4l2_capability *cap)
1067 {
1068         struct gspca_dev *gspca_dev = priv;
1069         int ret;
1070
1071         /* protect the access to the usb device */
1072         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1073                 return -ERESTARTSYS;
1074         if (!gspca_dev->present) {
1075                 ret = -ENODEV;
1076                 goto out;
1077         }
1078         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1079         if (gspca_dev->dev->product != NULL) {
1080                 strncpy(cap->card, gspca_dev->dev->product,
1081                         sizeof cap->card);
1082         } else {
1083                 snprintf(cap->card, sizeof cap->card,
1084                         "USB Camera (%04x:%04x)",
1085                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1086                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1087         }
1088         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1089         cap->version = DRIVER_VERSION_NUMBER;
1090         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1091                           | V4L2_CAP_STREAMING
1092                           | V4L2_CAP_READWRITE;
1093         ret = 0;
1094 out:
1095         mutex_unlock(&gspca_dev->usb_lock);
1096         return ret;
1097 }
1098
1099 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1100                                    int id)
1101 {
1102         const struct ctrl *ctrls;
1103         int i;
1104
1105         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1106              i < gspca_dev->sd_desc->nctrls;
1107              i++, ctrls++) {
1108                 if (gspca_dev->ctrl_dis & (1 << i))
1109                         continue;
1110                 if (id == ctrls->qctrl.id)
1111                         return ctrls;
1112         }
1113         return NULL;
1114 }
1115
1116 static int vidioc_queryctrl(struct file *file, void *priv,
1117                            struct v4l2_queryctrl *q_ctrl)
1118 {
1119         struct gspca_dev *gspca_dev = priv;
1120         const struct ctrl *ctrls;
1121         int i;
1122         u32 id;
1123
1124         ctrls = NULL;
1125         id = q_ctrl->id;
1126         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1127                 id &= V4L2_CTRL_ID_MASK;
1128                 id++;
1129                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1130                         if (gspca_dev->ctrl_dis & (1 << i))
1131                                 continue;
1132                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1133                                 continue;
1134                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1135                                             > ctrls->qctrl.id)
1136                                 continue;
1137                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1138                 }
1139         } else {
1140                 ctrls = get_ctrl(gspca_dev, id);
1141         }
1142         if (ctrls == NULL)
1143                 return -EINVAL;
1144         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1145         return 0;
1146 }
1147
1148 static int vidioc_s_ctrl(struct file *file, void *priv,
1149                          struct v4l2_control *ctrl)
1150 {
1151         struct gspca_dev *gspca_dev = priv;
1152         const struct ctrl *ctrls;
1153         int ret;
1154
1155         ctrls = get_ctrl(gspca_dev, ctrl->id);
1156         if (ctrls == NULL)
1157                 return -EINVAL;
1158
1159         if (ctrl->value < ctrls->qctrl.minimum
1160             || ctrl->value > ctrls->qctrl.maximum)
1161                 return -ERANGE;
1162         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1163         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1164                 return -ERESTARTSYS;
1165         if (gspca_dev->present)
1166                 ret = ctrls->set(gspca_dev, ctrl->value);
1167         else
1168                 ret = -ENODEV;
1169         mutex_unlock(&gspca_dev->usb_lock);
1170         return ret;
1171 }
1172
1173 static int vidioc_g_ctrl(struct file *file, void *priv,
1174                          struct v4l2_control *ctrl)
1175 {
1176         struct gspca_dev *gspca_dev = priv;
1177         const struct ctrl *ctrls;
1178         int ret;
1179
1180         ctrls = get_ctrl(gspca_dev, ctrl->id);
1181         if (ctrls == NULL)
1182                 return -EINVAL;
1183
1184         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1185                 return -ERESTARTSYS;
1186         if (gspca_dev->present)
1187                 ret = ctrls->get(gspca_dev, &ctrl->value);
1188         else
1189                 ret = -ENODEV;
1190         mutex_unlock(&gspca_dev->usb_lock);
1191         return ret;
1192 }
1193
1194 /*fixme: have an audio flag in gspca_dev?*/
1195 static int vidioc_s_audio(struct file *file, void *priv,
1196                          struct v4l2_audio *audio)
1197 {
1198         if (audio->index != 0)
1199                 return -EINVAL;
1200         return 0;
1201 }
1202
1203 static int vidioc_g_audio(struct file *file, void *priv,
1204                          struct v4l2_audio *audio)
1205 {
1206         strcpy(audio->name, "Microphone");
1207         return 0;
1208 }
1209
1210 static int vidioc_enumaudio(struct file *file, void *priv,
1211                          struct v4l2_audio *audio)
1212 {
1213         if (audio->index != 0)
1214                 return -EINVAL;
1215
1216         strcpy(audio->name, "Microphone");
1217         audio->capability = 0;
1218         audio->mode = 0;
1219         return 0;
1220 }
1221
1222 static int vidioc_querymenu(struct file *file, void *priv,
1223                             struct v4l2_querymenu *qmenu)
1224 {
1225         struct gspca_dev *gspca_dev = priv;
1226
1227         if (!gspca_dev->sd_desc->querymenu)
1228                 return -EINVAL;
1229         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1230 }
1231
1232 static int vidioc_enum_input(struct file *file, void *priv,
1233                                 struct v4l2_input *input)
1234 {
1235         struct gspca_dev *gspca_dev = priv;
1236
1237         if (input->index != 0)
1238                 return -EINVAL;
1239         input->type = V4L2_INPUT_TYPE_CAMERA;
1240         input->status = gspca_dev->cam.input_flags;
1241         strncpy(input->name, gspca_dev->sd_desc->name,
1242                 sizeof input->name);
1243         return 0;
1244 }
1245
1246 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1247 {
1248         *i = 0;
1249         return 0;
1250 }
1251
1252 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1253 {
1254         if (i > 0)
1255                 return -EINVAL;
1256         return (0);
1257 }
1258
1259 static int vidioc_reqbufs(struct file *file, void *priv,
1260                           struct v4l2_requestbuffers *rb)
1261 {
1262         struct gspca_dev *gspca_dev = priv;
1263         int i, ret = 0;
1264
1265         switch (rb->memory) {
1266         case GSPCA_MEMORY_READ:                 /* (internal call) */
1267         case V4L2_MEMORY_MMAP:
1268         case V4L2_MEMORY_USERPTR:
1269                 break;
1270         default:
1271                 return -EINVAL;
1272         }
1273         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1274                 return -ERESTARTSYS;
1275
1276         if (gspca_dev->memory != GSPCA_MEMORY_NO
1277             && gspca_dev->memory != rb->memory) {
1278                 ret = -EBUSY;
1279                 goto out;
1280         }
1281
1282         /* only one file may do the capture */
1283         if (gspca_dev->capt_file != NULL
1284             && gspca_dev->capt_file != file) {
1285                 ret = -EBUSY;
1286                 goto out;
1287         }
1288
1289         /* if allocated, the buffers must not be mapped */
1290         for (i = 0; i < gspca_dev->nframes; i++) {
1291                 if (gspca_dev->frame[i].vma_use_count) {
1292                         ret = -EBUSY;
1293                         goto out;
1294                 }
1295         }
1296
1297         /* stop streaming */
1298         if (gspca_dev->streaming) {
1299                 mutex_lock(&gspca_dev->usb_lock);
1300                 gspca_stream_off(gspca_dev);
1301                 mutex_unlock(&gspca_dev->usb_lock);
1302         }
1303
1304         /* free the previous allocated buffers, if any */
1305         if (gspca_dev->nframes != 0) {
1306                 frame_free(gspca_dev);
1307                 gspca_dev->capt_file = NULL;
1308         }
1309         if (rb->count == 0)                     /* unrequest */
1310                 goto out;
1311         gspca_dev->memory = rb->memory;
1312         ret = frame_alloc(gspca_dev, rb->count);
1313         if (ret == 0) {
1314                 rb->count = gspca_dev->nframes;
1315                 gspca_dev->capt_file = file;
1316         }
1317 out:
1318         mutex_unlock(&gspca_dev->queue_lock);
1319         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1320         return ret;
1321 }
1322
1323 static int vidioc_querybuf(struct file *file, void *priv,
1324                            struct v4l2_buffer *v4l2_buf)
1325 {
1326         struct gspca_dev *gspca_dev = priv;
1327         struct gspca_frame *frame;
1328
1329         if (v4l2_buf->index < 0
1330             || v4l2_buf->index >= gspca_dev->nframes)
1331                 return -EINVAL;
1332
1333         frame = &gspca_dev->frame[v4l2_buf->index];
1334         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1335         return 0;
1336 }
1337
1338 static int vidioc_streamon(struct file *file, void *priv,
1339                            enum v4l2_buf_type buf_type)
1340 {
1341         struct gspca_dev *gspca_dev = priv;
1342         int ret;
1343
1344         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1345                 return -EINVAL;
1346         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1347                 return -ERESTARTSYS;
1348
1349         if (gspca_dev->nframes == 0
1350             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1351                 ret = -EINVAL;
1352                 goto out;
1353         }
1354         if (!gspca_dev->streaming) {
1355                 ret = gspca_init_transfer(gspca_dev);
1356                 if (ret < 0)
1357                         goto out;
1358         }
1359 #ifdef GSPCA_DEBUG
1360         if (gspca_debug & D_STREAM) {
1361                 PDEBUG_MODE("stream on OK",
1362                         gspca_dev->pixfmt,
1363                         gspca_dev->width,
1364                         gspca_dev->height);
1365         }
1366 #endif
1367         ret = 0;
1368 out:
1369         mutex_unlock(&gspca_dev->queue_lock);
1370         return ret;
1371 }
1372
1373 static int vidioc_streamoff(struct file *file, void *priv,
1374                                 enum v4l2_buf_type buf_type)
1375 {
1376         struct gspca_dev *gspca_dev = priv;
1377         int i, ret;
1378
1379         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1380                 return -EINVAL;
1381         if (!gspca_dev->streaming)
1382                 return 0;
1383         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1384                 return -ERESTARTSYS;
1385
1386         /* stop streaming */
1387         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1388                 ret = -ERESTARTSYS;
1389                 goto out;
1390         }
1391         gspca_stream_off(gspca_dev);
1392         mutex_unlock(&gspca_dev->usb_lock);
1393
1394         /* empty the application queues */
1395         for (i = 0; i < gspca_dev->nframes; i++)
1396                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1398         gspca_dev->last_packet_type = DISCARD_PACKET;
1399         gspca_dev->sequence = 0;
1400         ret = 0;
1401 out:
1402         mutex_unlock(&gspca_dev->queue_lock);
1403         return ret;
1404 }
1405
1406 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1407                         struct v4l2_jpegcompression *jpegcomp)
1408 {
1409         struct gspca_dev *gspca_dev = priv;
1410         int ret;
1411
1412         if (!gspca_dev->sd_desc->get_jcomp)
1413                 return -EINVAL;
1414         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1415                 return -ERESTARTSYS;
1416         if (gspca_dev->present)
1417                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1418         else
1419                 ret = -ENODEV;
1420         mutex_unlock(&gspca_dev->usb_lock);
1421         return ret;
1422 }
1423
1424 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1425                         struct v4l2_jpegcompression *jpegcomp)
1426 {
1427         struct gspca_dev *gspca_dev = priv;
1428         int ret;
1429
1430         if (!gspca_dev->sd_desc->set_jcomp)
1431                 return -EINVAL;
1432         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1433                 return -ERESTARTSYS;
1434         if (gspca_dev->present)
1435                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1436         else
1437                 ret = -ENODEV;
1438         mutex_unlock(&gspca_dev->usb_lock);
1439         return ret;
1440 }
1441
1442 static int vidioc_g_parm(struct file *filp, void *priv,
1443                         struct v4l2_streamparm *parm)
1444 {
1445         struct gspca_dev *gspca_dev = priv;
1446
1447         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1448
1449         if (gspca_dev->sd_desc->get_streamparm) {
1450                 int ret;
1451
1452                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1453                         return -ERESTARTSYS;
1454                 if (gspca_dev->present)
1455                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1456                                                                  parm);
1457                 else
1458                         ret = -ENODEV;
1459                 mutex_unlock(&gspca_dev->usb_lock);
1460                 return ret;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int vidioc_s_parm(struct file *filp, void *priv,
1467                         struct v4l2_streamparm *parm)
1468 {
1469         struct gspca_dev *gspca_dev = priv;
1470         int n;
1471
1472         n = parm->parm.capture.readbuffers;
1473         if (n == 0 || n > GSPCA_MAX_FRAMES)
1474                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1475         else
1476                 gspca_dev->nbufread = n;
1477
1478         if (gspca_dev->sd_desc->set_streamparm) {
1479                 int ret;
1480
1481                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1482                         return -ERESTARTSYS;
1483                 if (gspca_dev->present)
1484                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1485                                                                  parm);
1486                 else
1487                         ret = -ENODEV;
1488                 mutex_unlock(&gspca_dev->usb_lock);
1489                 return ret;
1490         }
1491
1492         return 0;
1493 }
1494
1495 static int vidioc_s_std(struct file *filp, void *priv,
1496                         v4l2_std_id *parm)
1497 {
1498         return 0;
1499 }
1500
1501 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1502 static int vidiocgmbuf(struct file *file, void *priv,
1503                         struct video_mbuf *mbuf)
1504 {
1505         struct gspca_dev *gspca_dev = file->private_data;
1506         int i;
1507
1508         PDEBUG(D_STREAM, "cgmbuf");
1509         if (gspca_dev->nframes == 0) {
1510                 int ret;
1511
1512                 {
1513                         struct v4l2_format fmt;
1514
1515                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1516                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1517                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1518                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1519                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1520                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1521                         if (ret != 0)
1522                                 return ret;
1523                 }
1524                 {
1525                         struct v4l2_requestbuffers rb;
1526
1527                         memset(&rb, 0, sizeof rb);
1528                         rb.count = 4;
1529                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1530                         rb.memory = V4L2_MEMORY_MMAP;
1531                         ret = vidioc_reqbufs(file, priv, &rb);
1532                         if (ret != 0)
1533                                 return ret;
1534                 }
1535         }
1536         mbuf->frames = gspca_dev->nframes;
1537         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1538         for (i = 0; i < mbuf->frames; i++)
1539                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1540         return 0;
1541 }
1542 #endif
1543
1544 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1545 {
1546         struct gspca_dev *gspca_dev = file->private_data;
1547         struct gspca_frame *frame;
1548         struct page *page;
1549         unsigned long addr, start, size;
1550         int i, ret;
1551
1552         start = vma->vm_start;
1553         size = vma->vm_end - vma->vm_start;
1554         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1555
1556         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1557                 return -ERESTARTSYS;
1558         if (!gspca_dev->present) {
1559                 ret = -ENODEV;
1560                 goto out;
1561         }
1562         if (gspca_dev->capt_file != file) {
1563                 ret = -EINVAL;
1564                 goto out;
1565         }
1566
1567         frame = NULL;
1568         for (i = 0; i < gspca_dev->nframes; ++i) {
1569                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1570                         PDEBUG(D_STREAM, "mmap bad memory type");
1571                         break;
1572                 }
1573                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1574                                                 == vma->vm_pgoff) {
1575                         frame = &gspca_dev->frame[i];
1576                         break;
1577                 }
1578         }
1579         if (frame == NULL) {
1580                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1581                 ret = -EINVAL;
1582                 goto out;
1583         }
1584 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1585         /* v4l1 maps all the buffers */
1586         if (i != 0
1587             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1588 #endif
1589             if (size != frame->v4l2_buf.length) {
1590                 PDEBUG(D_STREAM, "mmap bad size");
1591                 ret = -EINVAL;
1592                 goto out;
1593         }
1594
1595         /*
1596          * - VM_IO marks the area as being a mmaped region for I/O to a
1597          *   device. It also prevents the region from being core dumped.
1598          */
1599         vma->vm_flags |= VM_IO;
1600
1601         addr = (unsigned long) frame->data;
1602         while (size > 0) {
1603                 page = vmalloc_to_page((void *) addr);
1604                 ret = vm_insert_page(vma, start, page);
1605                 if (ret < 0)
1606                         goto out;
1607                 start += PAGE_SIZE;
1608                 addr += PAGE_SIZE;
1609                 size -= PAGE_SIZE;
1610         }
1611
1612         vma->vm_ops = &gspca_vm_ops;
1613         vma->vm_private_data = frame;
1614         gspca_vm_open(vma);
1615         ret = 0;
1616 out:
1617         mutex_unlock(&gspca_dev->queue_lock);
1618         return ret;
1619 }
1620
1621 /*
1622  * wait for a video frame
1623  *
1624  * If a frame is ready, its index is returned.
1625  */
1626 static int frame_wait(struct gspca_dev *gspca_dev,
1627                         int nonblock_ing)
1628 {
1629         struct gspca_frame *frame;
1630         int i, j, ret;
1631
1632         /* check if a frame is ready */
1633         i = gspca_dev->fr_o;
1634         j = gspca_dev->fr_queue[i];
1635         frame = &gspca_dev->frame[j];
1636
1637         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1638                 if (nonblock_ing)
1639                         return -EAGAIN;
1640
1641                 /* wait till a frame is ready */
1642                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1643                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1644                         !gspca_dev->streaming || !gspca_dev->present,
1645                         msecs_to_jiffies(3000));
1646                 if (ret < 0)
1647                         return ret;
1648                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1649                         return -EIO;
1650         }
1651
1652         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1653         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1654                 gspca_dev->fr_q,
1655                 gspca_dev->fr_i,
1656                 gspca_dev->fr_o);
1657
1658         if (gspca_dev->sd_desc->dq_callback) {
1659                 mutex_lock(&gspca_dev->usb_lock);
1660                 if (gspca_dev->present)
1661                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1662                 mutex_unlock(&gspca_dev->usb_lock);
1663         }
1664         return j;
1665 }
1666
1667 /*
1668  * dequeue a video buffer
1669  *
1670  * If nonblock_ing is false, block until a buffer is available.
1671  */
1672 static int vidioc_dqbuf(struct file *file, void *priv,
1673                         struct v4l2_buffer *v4l2_buf)
1674 {
1675         struct gspca_dev *gspca_dev = priv;
1676         struct gspca_frame *frame;
1677         int i, ret;
1678
1679         PDEBUG(D_FRAM, "dqbuf");
1680         if (v4l2_buf->memory != gspca_dev->memory)
1681                 return -EINVAL;
1682
1683         if (!gspca_dev->present)
1684                 return -ENODEV;
1685
1686         /* if not streaming, be sure the application will not loop forever */
1687         if (!(file->f_flags & O_NONBLOCK)
1688             && !gspca_dev->streaming && gspca_dev->users == 1)
1689                 return -EINVAL;
1690
1691         /* only the capturing file may dequeue */
1692         if (gspca_dev->capt_file != file)
1693                 return -EINVAL;
1694
1695         /* only one dequeue / read at a time */
1696         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1697                 return -ERESTARTSYS;
1698
1699         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1700         if (ret < 0)
1701                 goto out;
1702         i = ret;                                /* frame index */
1703         frame = &gspca_dev->frame[i];
1704         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1705                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1706                                  frame->data,
1707                                  frame->v4l2_buf.bytesused)) {
1708                         PDEBUG(D_ERR|D_STREAM,
1709                                 "dqbuf cp to user failed");
1710                         ret = -EFAULT;
1711                         goto out;
1712                 }
1713         }
1714         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1715         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1716         PDEBUG(D_FRAM, "dqbuf %d", i);
1717         ret = 0;
1718 out:
1719         mutex_unlock(&gspca_dev->read_lock);
1720         return ret;
1721 }
1722
1723 /*
1724  * queue a video buffer
1725  *
1726  * Attempting to queue a buffer that has already been
1727  * queued will return -EINVAL.
1728  */
1729 static int vidioc_qbuf(struct file *file, void *priv,
1730                         struct v4l2_buffer *v4l2_buf)
1731 {
1732         struct gspca_dev *gspca_dev = priv;
1733         struct gspca_frame *frame;
1734         int i, index, ret;
1735
1736         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1737
1738         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1739                 return -ERESTARTSYS;
1740
1741         index = v4l2_buf->index;
1742         if ((unsigned) index >= gspca_dev->nframes) {
1743                 PDEBUG(D_FRAM,
1744                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1745                 ret = -EINVAL;
1746                 goto out;
1747         }
1748         if (v4l2_buf->memory != gspca_dev->memory) {
1749                 PDEBUG(D_FRAM, "qbuf bad memory type");
1750                 ret = -EINVAL;
1751                 goto out;
1752         }
1753
1754         frame = &gspca_dev->frame[index];
1755         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1756                 PDEBUG(D_FRAM, "qbuf bad state");
1757                 ret = -EINVAL;
1758                 goto out;
1759         }
1760
1761         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1762
1763         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1764                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1765                 frame->v4l2_buf.length = v4l2_buf->length;
1766         }
1767
1768         /* put the buffer in the 'queued' queue */
1769         i = gspca_dev->fr_q;
1770         gspca_dev->fr_queue[i] = index;
1771         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1772         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1773                 gspca_dev->fr_q,
1774                 gspca_dev->fr_i,
1775                 gspca_dev->fr_o);
1776
1777         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1778         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1779         ret = 0;
1780 out:
1781         mutex_unlock(&gspca_dev->queue_lock);
1782         return ret;
1783 }
1784
1785 /*
1786  * allocate the resources for read()
1787  */
1788 static int read_alloc(struct gspca_dev *gspca_dev,
1789                         struct file *file)
1790 {
1791         struct v4l2_buffer v4l2_buf;
1792         int i, ret;
1793
1794         PDEBUG(D_STREAM, "read alloc");
1795         if (gspca_dev->nframes == 0) {
1796                 struct v4l2_requestbuffers rb;
1797
1798                 memset(&rb, 0, sizeof rb);
1799                 rb.count = gspca_dev->nbufread;
1800                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1801                 rb.memory = GSPCA_MEMORY_READ;
1802                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1803                 if (ret != 0) {
1804                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1805                         return ret;
1806                 }
1807                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1808                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1809                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1810                 for (i = 0; i < gspca_dev->nbufread; i++) {
1811                         v4l2_buf.index = i;
1812                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1813                         if (ret != 0) {
1814                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1815                                 return ret;
1816                         }
1817                 }
1818                 gspca_dev->memory = GSPCA_MEMORY_READ;
1819         }
1820
1821         /* start streaming */
1822         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1823         if (ret != 0)
1824                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1825         return ret;
1826 }
1827
1828 static unsigned int dev_poll(struct file *file, poll_table *wait)
1829 {
1830         struct gspca_dev *gspca_dev = file->private_data;
1831         int i, ret;
1832
1833         PDEBUG(D_FRAM, "poll");
1834
1835         poll_wait(file, &gspca_dev->wq, wait);
1836
1837         /* if reqbufs is not done, the user would use read() */
1838         if (gspca_dev->nframes == 0) {
1839                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1840                         return POLLERR;         /* not the 1st time */
1841                 ret = read_alloc(gspca_dev, file);
1842                 if (ret != 0)
1843                         return POLLERR;
1844         }
1845
1846         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1847                 return POLLERR;
1848
1849         /* check the next incoming buffer */
1850         i = gspca_dev->fr_o;
1851         i = gspca_dev->fr_queue[i];
1852         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1853                 ret = POLLIN | POLLRDNORM;      /* something to read */
1854         else
1855                 ret = 0;
1856         mutex_unlock(&gspca_dev->queue_lock);
1857         if (!gspca_dev->present)
1858                 return POLLHUP;
1859         return ret;
1860 }
1861
1862 static ssize_t dev_read(struct file *file, char __user *data,
1863                     size_t count, loff_t *ppos)
1864 {
1865         struct gspca_dev *gspca_dev = file->private_data;
1866         struct gspca_frame *frame;
1867         struct v4l2_buffer v4l2_buf;
1868         struct timeval timestamp;
1869         int n, ret, ret2;
1870
1871         PDEBUG(D_FRAM, "read (%zd)", count);
1872         if (!gspca_dev->present)
1873                 return -ENODEV;
1874         switch (gspca_dev->memory) {
1875         case GSPCA_MEMORY_NO:                   /* first time */
1876                 ret = read_alloc(gspca_dev, file);
1877                 if (ret != 0)
1878                         return ret;
1879                 break;
1880         case GSPCA_MEMORY_READ:
1881                 if (gspca_dev->capt_file == file)
1882                         break;
1883                 /* fall thru */
1884         default:
1885                 return -EINVAL;
1886         }
1887
1888         /* get a frame */
1889         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1890         timestamp.tv_sec--;
1891         n = 2;
1892         for (;;) {
1893                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1894                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1895                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1896                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1897                 if (ret != 0) {
1898                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1899                         return ret;
1900                 }
1901
1902                 /* if the process slept for more than 1 second,
1903                  * get a newer frame */
1904                 frame = &gspca_dev->frame[v4l2_buf.index];
1905                 if (--n < 0)
1906                         break;                  /* avoid infinite loop */
1907                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1908                         break;
1909                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1910                 if (ret != 0) {
1911                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1912                         return ret;
1913                 }
1914         }
1915
1916         /* copy the frame */
1917         if (count > frame->v4l2_buf.bytesused)
1918                 count = frame->v4l2_buf.bytesused;
1919         ret = copy_to_user(data, frame->data, count);
1920         if (ret != 0) {
1921                 PDEBUG(D_ERR|D_STREAM,
1922                         "read cp to user lack %d / %zd", ret, count);
1923                 ret = -EFAULT;
1924                 goto out;
1925         }
1926         ret = count;
1927 out:
1928         /* in each case, requeue the buffer */
1929         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1930         if (ret2 != 0)
1931                 return ret2;
1932         return ret;
1933 }
1934
1935 static struct v4l2_file_operations dev_fops = {
1936         .owner = THIS_MODULE,
1937         .open = dev_open,
1938         .release = dev_close,
1939         .read = dev_read,
1940         .mmap = dev_mmap,
1941         .unlocked_ioctl = video_ioctl2,
1942         .poll   = dev_poll,
1943 };
1944
1945 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1946         .vidioc_querycap        = vidioc_querycap,
1947         .vidioc_dqbuf           = vidioc_dqbuf,
1948         .vidioc_qbuf            = vidioc_qbuf,
1949         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1950         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1951         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1952         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1953         .vidioc_streamon        = vidioc_streamon,
1954         .vidioc_queryctrl       = vidioc_queryctrl,
1955         .vidioc_g_ctrl          = vidioc_g_ctrl,
1956         .vidioc_s_ctrl          = vidioc_s_ctrl,
1957         .vidioc_g_audio         = vidioc_g_audio,
1958         .vidioc_s_audio         = vidioc_s_audio,
1959         .vidioc_enumaudio       = vidioc_enumaudio,
1960         .vidioc_querymenu       = vidioc_querymenu,
1961         .vidioc_enum_input      = vidioc_enum_input,
1962         .vidioc_g_input         = vidioc_g_input,
1963         .vidioc_s_input         = vidioc_s_input,
1964         .vidioc_reqbufs         = vidioc_reqbufs,
1965         .vidioc_querybuf        = vidioc_querybuf,
1966         .vidioc_streamoff       = vidioc_streamoff,
1967         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1968         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1969         .vidioc_g_parm          = vidioc_g_parm,
1970         .vidioc_s_parm          = vidioc_s_parm,
1971         .vidioc_s_std           = vidioc_s_std,
1972         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1973 #ifdef CONFIG_VIDEO_ADV_DEBUG
1974         .vidioc_g_register      = vidioc_g_register,
1975         .vidioc_s_register      = vidioc_s_register,
1976 #endif
1977         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1978 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1979         .vidiocgmbuf          = vidiocgmbuf,
1980 #endif
1981 };
1982
1983 static struct video_device gspca_template = {
1984         .name = "gspca main driver",
1985         .fops = &dev_fops,
1986         .ioctl_ops = &dev_ioctl_ops,
1987         .release = gspca_release,
1988         .minor = -1,
1989 };
1990
1991 /*
1992  * probe and create a new gspca device
1993  *
1994  * This function must be called by the sub-driver when it is
1995  * called for probing a new device.
1996  */
1997 int gspca_dev_probe(struct usb_interface *intf,
1998                 const struct usb_device_id *id,
1999                 const struct sd_desc *sd_desc,
2000                 int dev_size,
2001                 struct module *module)
2002 {
2003         struct usb_interface_descriptor *interface;
2004         struct gspca_dev *gspca_dev;
2005         struct usb_device *dev = interface_to_usbdev(intf);
2006         int ret;
2007
2008         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2009
2010         /* we don't handle multi-config cameras */
2011         if (dev->descriptor.bNumConfigurations != 1)
2012                 return -ENODEV;
2013         interface = &intf->cur_altsetting->desc;
2014         if (interface->bInterfaceNumber > 0)
2015                 return -ENODEV;
2016
2017         /* create the device */
2018         if (dev_size < sizeof *gspca_dev)
2019                 dev_size = sizeof *gspca_dev;
2020         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2021         if (!gspca_dev) {
2022                 err("couldn't kzalloc gspca struct");
2023                 return -ENOMEM;
2024         }
2025         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2026         if (!gspca_dev->usb_buf) {
2027                 err("out of memory");
2028                 ret = -ENOMEM;
2029                 goto out;
2030         }
2031         gspca_dev->dev = dev;
2032         gspca_dev->iface = interface->bInterfaceNumber;
2033         gspca_dev->nbalt = intf->num_altsetting;
2034         gspca_dev->sd_desc = sd_desc;
2035         gspca_dev->nbufread = 2;
2036         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2037
2038         /* configure the subdriver and initialize the USB device */
2039         ret = sd_desc->config(gspca_dev, id);
2040         if (ret < 0)
2041                 goto out;
2042         ret = sd_desc->init(gspca_dev);
2043         if (ret < 0)
2044                 goto out;
2045         ret = gspca_set_alt0(gspca_dev);
2046         if (ret < 0)
2047                 goto out;
2048         gspca_set_default_mode(gspca_dev);
2049
2050         mutex_init(&gspca_dev->usb_lock);
2051         mutex_init(&gspca_dev->read_lock);
2052         mutex_init(&gspca_dev->queue_lock);
2053         init_waitqueue_head(&gspca_dev->wq);
2054
2055         /* init video stuff */
2056         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2057         gspca_dev->vdev.parent = &intf->dev;
2058         gspca_dev->module = module;
2059         gspca_dev->present = 1;
2060         ret = video_register_device(&gspca_dev->vdev,
2061                                   VFL_TYPE_GRABBER,
2062                                   -1);
2063         if (ret < 0) {
2064                 err("video_register_device err %d", ret);
2065                 goto out;
2066         }
2067
2068         usb_set_intfdata(intf, gspca_dev);
2069         PDEBUG(D_PROBE, "probe ok");
2070         return 0;
2071 out:
2072         kfree(gspca_dev->usb_buf);
2073         kfree(gspca_dev);
2074         return ret;
2075 }
2076 EXPORT_SYMBOL(gspca_dev_probe);
2077
2078 /*
2079  * USB disconnection
2080  *
2081  * This function must be called by the sub-driver
2082  * when the device disconnects, after the specific resources are freed.
2083  */
2084 void gspca_disconnect(struct usb_interface *intf)
2085 {
2086         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2087
2088         mutex_lock(&gspca_dev->usb_lock);
2089         gspca_dev->present = 0;
2090
2091         if (gspca_dev->streaming) {
2092                 destroy_urbs(gspca_dev);
2093                 wake_up_interruptible(&gspca_dev->wq);
2094         }
2095
2096         /* the device is freed at exit of this function */
2097         gspca_dev->dev = NULL;
2098         mutex_unlock(&gspca_dev->usb_lock);
2099
2100         usb_set_intfdata(intf, NULL);
2101
2102         /* release the device */
2103         /* (this will call gspca_release() immediatly or on last close) */
2104         video_unregister_device(&gspca_dev->vdev);
2105
2106         PDEBUG(D_PROBE, "disconnect complete");
2107 }
2108 EXPORT_SYMBOL(gspca_disconnect);
2109
2110 #ifdef CONFIG_PM
2111 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2112 {
2113         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2114
2115         if (!gspca_dev->streaming)
2116                 return 0;
2117         gspca_dev->frozen = 1;          /* avoid urb error messages */
2118         if (gspca_dev->sd_desc->stopN)
2119                 gspca_dev->sd_desc->stopN(gspca_dev);
2120         destroy_urbs(gspca_dev);
2121         gspca_set_alt0(gspca_dev);
2122         if (gspca_dev->sd_desc->stop0)
2123                 gspca_dev->sd_desc->stop0(gspca_dev);
2124         return 0;
2125 }
2126 EXPORT_SYMBOL(gspca_suspend);
2127
2128 int gspca_resume(struct usb_interface *intf)
2129 {
2130         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2131
2132         gspca_dev->frozen = 0;
2133         gspca_dev->sd_desc->init(gspca_dev);
2134         if (gspca_dev->streaming)
2135                 return gspca_init_transfer(gspca_dev);
2136         return 0;
2137 }
2138 EXPORT_SYMBOL(gspca_resume);
2139 #endif
2140 /* -- cam driver utility functions -- */
2141
2142 /* auto gain and exposure algorithm based on the knee algorithm described here:
2143    http://ytse.tricolour.net/docs/LowLightOptimization.html
2144
2145    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2146    where changed. */
2147 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2148         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2149 {
2150         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2151         const struct ctrl *gain_ctrl = NULL;
2152         const struct ctrl *exposure_ctrl = NULL;
2153         const struct ctrl *autogain_ctrl = NULL;
2154         int retval = 0;
2155
2156         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2157                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2158                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2159                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2160                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2161                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2162                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2163         }
2164         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2165                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2166                         "on cam without (auto)gain/exposure");
2167                 return 0;
2168         }
2169
2170         if (gain_ctrl->get(gspca_dev, &gain) ||
2171                         exposure_ctrl->get(gspca_dev, &exposure) ||
2172                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2173                 return 0;
2174
2175         orig_gain = gain;
2176         orig_exposure = exposure;
2177
2178         /* If we are of a multiple of deadzone, do multiple steps to reach the
2179            desired lumination fast (with the risc of a slight overshoot) */
2180         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2181
2182         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2183                 avg_lum, desired_avg_lum, steps);
2184
2185         for (i = 0; i < steps; i++) {
2186                 if (avg_lum > desired_avg_lum) {
2187                         if (gain > gain_knee)
2188                                 gain--;
2189                         else if (exposure > exposure_knee)
2190                                 exposure--;
2191                         else if (gain > gain_ctrl->qctrl.default_value)
2192                                 gain--;
2193                         else if (exposure > exposure_ctrl->qctrl.minimum)
2194                                 exposure--;
2195                         else if (gain > gain_ctrl->qctrl.minimum)
2196                                 gain--;
2197                         else
2198                                 break;
2199                 } else {
2200                         if (gain < gain_ctrl->qctrl.default_value)
2201                                 gain++;
2202                         else if (exposure < exposure_knee)
2203                                 exposure++;
2204                         else if (gain < gain_knee)
2205                                 gain++;
2206                         else if (exposure < exposure_ctrl->qctrl.maximum)
2207                                 exposure++;
2208                         else if (gain < gain_ctrl->qctrl.maximum)
2209                                 gain++;
2210                         else
2211                                 break;
2212                 }
2213         }
2214
2215         if (gain != orig_gain) {
2216                 gain_ctrl->set(gspca_dev, gain);
2217                 retval = 1;
2218         }
2219         if (exposure != orig_exposure) {
2220                 exposure_ctrl->set(gspca_dev, exposure);
2221                 retval = 1;
2222         }
2223
2224         return retval;
2225 }
2226 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2227
2228 /* -- module insert / remove -- */
2229 static int __init gspca_init(void)
2230 {
2231         info("main v%d.%d.%d registered",
2232                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2233                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2234                 DRIVER_VERSION_NUMBER & 0xff);
2235         return 0;
2236 }
2237 static void __exit gspca_exit(void)
2238 {
2239         info("main deregistered");
2240 }
2241
2242 module_init(gspca_init);
2243 module_exit(gspca_exit);
2244
2245 #ifdef GSPCA_DEBUG
2246 module_param_named(debug, gspca_debug, int, 0644);
2247 MODULE_PARM_DESC(debug,
2248                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2249                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2250                 " 0x0100: v4l2");
2251 #endif