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, 8, 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 be 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 const 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                         return;
 140 #endif
 141                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 142                 goto resubmit;
 143         }
 144         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 145         for (i = 0; i < urb->number_of_packets; i++) {
 146
 147                 /* check the availability of the frame buffer */
 148                 frame = gspca_get_i_frame(gspca_dev);
 149                 if (!frame) {
 150                         gspca_dev->last_packet_type = DISCARD_PACKET;
 151                         break;
 152                 }
 153
 154                 /* check the packet status and length */
 155                 len = urb->iso_frame_desc[i].actual_length;
 156                 if (len == 0) {
 157                         if (gspca_dev->empty_packet == 0)
 158                                 gspca_dev->empty_packet = 1;
 159                         continue;
 160                 }
 161                 st = urb->iso_frame_desc[i].status;
 162                 if (st) {
 163                         PDEBUG(D_ERR,
 164                                 "ISOC data error: [%d] len=%d, status=%d",
 165                                 i, len, st);
 166                         gspca_dev->last_packet_type = DISCARD_PACKET;
 167                         continue;
 168                 }
 169
 170                 /* let the packet be analyzed by the subdriver */
 171                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 172                         i, urb->iso_frame_desc[i].offset, len);
 173                 data = (u8 *) urb->transfer_buffer
 174                                         + urb->iso_frame_desc[i].offset;
 175                 pkt_scan(gspca_dev, frame, data, len);
 176         }
 177
 178 resubmit:
 179         /* resubmit the URB */
 180         st = usb_submit_urb(urb, GFP_ATOMIC);
 181         if (st < 0)
 182                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 183 }
 184
 185 /*
 186  * ISOC message interrupt from the USB device
 187  *
 188  * Analyse each packet and call the subdriver for copy to the frame buffer.
 189  */
 190 static void isoc_irq(struct urb *urb)
 191 {
 192         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 193
 194         PDEBUG(D_PACK, "isoc irq");
 195         if (!gspca_dev->streaming)
 196                 return;
 197         fill_frame(gspca_dev, urb);
 198 }
 199
 200 /*
 201  * bulk message interrupt from the USB device
 202  */
 203 static void bulk_irq(struct urb *urb)
 204 {
 205         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 206         struct gspca_frame *frame;
 207         int st;
 208
 209         PDEBUG(D_PACK, "bulk irq");
 210         if (!gspca_dev->streaming)
 211                 return;
 212         switch (urb->status) {
 213         case 0:
 214                 break;
 215         case -ESHUTDOWN:
 216                 return;         /* disconnection */
 217         case -ECONNRESET:
 218                 urb->status = 0;
 219                 break;
 220         default:
 221 #ifdef CONFIG_PM
 222                 if (gspca_dev->frozen)
 223                         return;
 224 #endif
 225                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 226                 goto resubmit;
 227         }
 228
 229         /* check the availability of the frame buffer */
 230         frame = gspca_get_i_frame(gspca_dev);
 231         if (!frame) {
 232                 gspca_dev->last_packet_type = DISCARD_PACKET;
 233         } else {
 234                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 235                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 236                                         frame,
 237                                         urb->transfer_buffer,
 238                                         urb->actual_length);
 239         }
 240
 241 resubmit:
 242         /* resubmit the URB */
 243         if (gspca_dev->cam.bulk_nurbs != 0) {
 244                 st = usb_submit_urb(urb, GFP_ATOMIC);
 245                 if (st < 0)
 246                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 247         }
 248 }
 249
 250 /*
 251  * add data to the current frame
 252  *
 253  * This function is called by the subdrivers at interrupt level.
 254  *
 255  * To build a frame, these ones must add
 256  *      - one FIRST_PACKET
 257  *      - 0 or many INTER_PACKETs
 258  *      - one LAST_PACKET
 259  * DISCARD_PACKET invalidates the whole frame.
 260  * On LAST_PACKET, a new frame is returned.
 261  */
 262 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 263                                     enum gspca_packet_type packet_type,
 264                                     struct gspca_frame *frame,
 265                                     const __u8 *data,
 266                                     int len)
 267 {
 268         int i, j;
 269
 270         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 271
 272         /* when start of a new frame, if the current frame buffer
 273          * is not queued, discard the whole frame */
 274         if (packet_type == FIRST_PACKET) {
 275                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 276                                                 != V4L2_BUF_FLAG_QUEUED) {
 277                         gspca_dev->last_packet_type = DISCARD_PACKET;
 278                         return frame;
 279                 }
 280                 frame->data_end = frame->data;
 281                 jiffies_to_timeval(get_jiffies_64(),
 282                                    &frame->v4l2_buf.timestamp);
 283                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 284         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 285                 if (packet_type == LAST_PACKET)
 286                         gspca_dev->last_packet_type = packet_type;
 287                 return frame;
 288         }
 289
 290         /* append the packet to the frame buffer */
 291         if (len > 0) {
 292                 if (frame->data_end - frame->data + len
 293                                                  > frame->v4l2_buf.length) {
 294                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 295                                 frame->data_end - frame->data + len,
 296                                 frame->v4l2_buf.length);
 297                         packet_type = DISCARD_PACKET;
 298                 } else {
 299                         memcpy(frame->data_end, data, len);
 300                         frame->data_end += len;
 301                 }
 302         }
 303         gspca_dev->last_packet_type = packet_type;
 304
 305         /* if last packet, wake up the application and advance in the queue */
 306         if (packet_type == LAST_PACKET) {
 307                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 308                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 309                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 310                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 311                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 312                 gspca_dev->fr_i = i;
 313                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 314                         frame->v4l2_buf.bytesused,
 315                         gspca_dev->fr_q,
 316                         i,
 317                         gspca_dev->fr_o);
 318                 j = gspca_dev->fr_queue[i];
 319                 frame = &gspca_dev->frame[j];
 320         }
 321         return frame;
 322 }
 323 EXPORT_SYMBOL(gspca_frame_add);
 324
 325 static int gspca_is_compressed(__u32 format)
 326 {
 327         switch (format) {
 328         case V4L2_PIX_FMT_MJPEG:
 329         case V4L2_PIX_FMT_JPEG:
 330         case V4L2_PIX_FMT_SPCA561:
 331         case V4L2_PIX_FMT_PAC207:
 332         case V4L2_PIX_FMT_MR97310A:
 333                 return 1;
 334         }
 335         return 0;
 336 }
 337
 338 static void *rvmalloc(unsigned long size)
 339 {
 340         void *mem;
 341         unsigned long adr;
 342
 343         mem = vmalloc_32(size);
 344         if (mem != NULL) {
 345                 adr = (unsigned long) mem;
 346                 while ((long) size > 0) {
 347                         SetPageReserved(vmalloc_to_page((void *) adr));
 348                         adr += PAGE_SIZE;
 349                         size -= PAGE_SIZE;
 350                 }
 351         }
 352         return mem;
 353 }
 354
 355 static void rvfree(void *mem, long size)
 356 {
 357         unsigned long adr;
 358
 359         adr = (unsigned long) mem;
 360         while (size > 0) {
 361                 ClearPageReserved(vmalloc_to_page((void *) adr));
 362                 adr += PAGE_SIZE;
 363                 size -= PAGE_SIZE;
 364         }
 365         vfree(mem);
 366 }
 367
 368 static int frame_alloc(struct gspca_dev *gspca_dev,
 369                         unsigned int count)
 370 {
 371         struct gspca_frame *frame;
 372         unsigned int frsz;
 373         int i;
 374
 375         i = gspca_dev->curr_mode;
 376         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 377         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 378         frsz = PAGE_ALIGN(frsz);
 379         gspca_dev->frsz = frsz;
 380         if (count > GSPCA_MAX_FRAMES)
 381                 count = GSPCA_MAX_FRAMES;
 382         gspca_dev->frbuf = rvmalloc(frsz * count);
 383         if (!gspca_dev->frbuf) {
 384                 err("frame alloc failed");
 385                 return -ENOMEM;
 386         }
 387         gspca_dev->nframes = count;
 388         for (i = 0; i < count; i++) {
 389                 frame = &gspca_dev->frame[i];
 390                 frame->v4l2_buf.index = i;
 391                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 392                 frame->v4l2_buf.flags = 0;
 393                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 394                 frame->v4l2_buf.length = frsz;
 395                 frame->v4l2_buf.memory = gspca_dev->memory;
 396                 frame->v4l2_buf.sequence = 0;
 397                 frame->data = frame->data_end =
 398                                         gspca_dev->frbuf + i * frsz;
 399                 frame->v4l2_buf.m.offset = i * frsz;
 400         }
 401         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 402         gspca_dev->last_packet_type = DISCARD_PACKET;
 403         gspca_dev->sequence = 0;
 404         return 0;
 405 }
 406
 407 static void frame_free(struct gspca_dev *gspca_dev)
 408 {
 409         int i;
 410
 411         PDEBUG(D_STREAM, "frame free");
 412         if (gspca_dev->frbuf != NULL) {
 413                 rvfree(gspca_dev->frbuf,
 414                         gspca_dev->nframes * gspca_dev->frsz);
 415                 gspca_dev->frbuf = NULL;
 416                 for (i = 0; i < gspca_dev->nframes; i++)
 417                         gspca_dev->frame[i].data = NULL;
 418         }
 419         gspca_dev->nframes = 0;
 420 }
 421
 422 static void destroy_urbs(struct gspca_dev *gspca_dev)
 423 {
 424         struct urb *urb;
 425         unsigned int i;
 426
 427         PDEBUG(D_STREAM, "kill transfer");
 428         for (i = 0; i < MAX_NURBS; i++) {
 429                 urb = gspca_dev->urb[i];
 430                 if (urb == NULL)
 431                         break;
 432
 433                 gspca_dev->urb[i] = NULL;
 434                 usb_kill_urb(urb);
 435                 if (urb->transfer_buffer != NULL)
 436                         usb_buffer_free(gspca_dev->dev,
 437                                         urb->transfer_buffer_length,
 438                                         urb->transfer_buffer,
 439                                         urb->transfer_dma);
 440                 usb_free_urb(urb);
 441         }
 442 }
 443
 444 /*
 445  * look for an input transfer endpoint in an alternate setting
 446  */
 447 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 448                                           int xfer)
 449 {
 450         struct usb_host_endpoint *ep;
 451         int i, attr;
 452
 453         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 454                 ep = &alt->endpoint[i];
 455                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 456                 if (attr == xfer
 457                     && ep->desc.wMaxPacketSize != 0)
 458                         return ep;
 459         }
 460         return NULL;
 461 }
 462
 463 /*
 464  * look for an input (isoc or bulk) endpoint
 465  *
 466  * The endpoint is defined by the subdriver.
 467  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 468  * This routine may be called many times when the bandwidth is too small
 469  * (the bandwidth is checked on urb submit).
 470  */
 471 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 472 {
 473         struct usb_interface *intf;
 474         struct usb_host_endpoint *ep;
 475         int xfer, i, ret;
 476
 477         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 478         ep = NULL;
 479         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 480                                    : USB_ENDPOINT_XFER_ISOC;
 481         i = gspca_dev->alt;                     /* previous alt setting */
 482         if (gspca_dev->cam.reverse_alts) {
 483                 while (++i < gspca_dev->nbalt) {
 484                         ep = alt_xfer(&intf->altsetting[i], xfer);
 485                         if (ep)
 486                                 break;
 487                 }
 488         } else {
 489                 while (--i >= 0) {
 490                         ep = alt_xfer(&intf->altsetting[i], xfer);
 491                         if (ep)
 492                                 break;
 493                 }
 494         }
 495         if (ep == NULL) {
 496                 err("no transfer endpoint found");
 497                 return NULL;
 498         }
 499         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 500                         i, ep->desc.bEndpointAddress);
 501         gspca_dev->alt = i;             /* memorize the current alt setting */
 502         if (gspca_dev->nbalt > 1) {
 503                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 504                 if (ret < 0) {
 505                         err("set alt %d err %d", i, ret);
 506                         return NULL;
 507                 }
 508         }
 509         return ep;
 510 }
 511
 512 /*
 513  * create the URBs for image transfer
 514  */
 515 static int create_urbs(struct gspca_dev *gspca_dev,
 516                         struct usb_host_endpoint *ep)
 517 {
 518         struct urb *urb;
 519         int n, nurbs, i, psize, npkt, bsize;
 520
 521         /* calculate the packet size and the number of packets */
 522         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 523
 524         if (!gspca_dev->cam.bulk) {             /* isoc */
 525
 526                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 527                 if (gspca_dev->pkt_size == 0)
 528                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 529                 else
 530                         psize = gspca_dev->pkt_size;
 531                 npkt = gspca_dev->cam.npkt;
 532                 if (npkt == 0)
 533                         npkt = 32;              /* default value */
 534                 bsize = psize * npkt;
 535                 PDEBUG(D_STREAM,
 536                         "isoc %d pkts size %d = bsize:%d",
 537                         npkt, psize, bsize);
 538                 nurbs = DEF_NURBS;
 539         } else {                                /* bulk */
 540                 npkt = 0;
 541                 bsize = gspca_dev->cam.bulk_size;
 542                 if (bsize == 0)
 543                         bsize = psize;
 544                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 545                 if (gspca_dev->cam.bulk_nurbs != 0)
 546                         nurbs = gspca_dev->cam.bulk_nurbs;
 547                 else
 548                         nurbs = 1;
 549         }
 550
 551         gspca_dev->nurbs = nurbs;
 552         for (n = 0; n < nurbs; n++) {
 553                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 554                 if (!urb) {
 555                         err("usb_alloc_urb failed");
 556                         destroy_urbs(gspca_dev);
 557                         return -ENOMEM;
 558                 }
 559                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 560                                                 bsize,
 561                                                 GFP_KERNEL,
 562                                                 &urb->transfer_dma);
 563
 564                 if (urb->transfer_buffer == NULL) {
 565                         usb_free_urb(urb);
 566                         err("usb_buffer_urb failed");
 567                         destroy_urbs(gspca_dev);
 568                         return -ENOMEM;
 569                 }
 570                 gspca_dev->urb[n] = urb;
 571                 urb->dev = gspca_dev->dev;
 572                 urb->context = gspca_dev;
 573                 urb->transfer_buffer_length = bsize;
 574                 if (npkt != 0) {                /* ISOC */
 575                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 576                                                     ep->desc.bEndpointAddress);
 577                         urb->transfer_flags = URB_ISO_ASAP
 578                                         | URB_NO_TRANSFER_DMA_MAP;
 579                         urb->interval = ep->desc.bInterval;
 580                         urb->complete = isoc_irq;
 581                         urb->number_of_packets = npkt;
 582                         for (i = 0; i < npkt; i++) {
 583                                 urb->iso_frame_desc[i].length = psize;
 584                                 urb->iso_frame_desc[i].offset = psize * i;
 585                         }
 586                 } else {                /* bulk */
 587                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 588                                                 ep->desc.bEndpointAddress),
 589                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 590                         urb->complete = bulk_irq;
 591                 }
 592         }
 593         return 0;
 594 }
 595
 596 /*
 597  * start the USB transfer
 598  */
 599 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 600 {
 601         struct usb_host_endpoint *ep;
 602         int n, ret;
 603
 604         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 605                 return -ERESTARTSYS;
 606
 607         if (!gspca_dev->present) {
 608                 ret = -ENODEV;
 609                 goto out;
 610         }
 611
 612         /* set the higher alternate setting and
 613          * loop until urb submit succeeds */
 614         if (gspca_dev->cam.reverse_alts)
 615                 gspca_dev->alt = 0;
 616         else
 617                 gspca_dev->alt = gspca_dev->nbalt;
 618
 619         if (gspca_dev->sd_desc->isoc_init) {
 620                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 621                 if (ret < 0)
 622                         goto out;
 623         }
 624         ep = get_ep(gspca_dev);
 625         if (ep == NULL) {
 626                 ret = -EIO;
 627                 goto out;
 628         }
 629         for (;;) {
 630                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 631                 ret = create_urbs(gspca_dev, ep);
 632                 if (ret < 0)
 633                         goto out;
 634
 635                 /* clear the bulk endpoint */
 636                 if (gspca_dev->cam.bulk)
 637                         usb_clear_halt(gspca_dev->dev,
 638                                         gspca_dev->urb[0]->pipe);
 639
 640                 /* start the cam */
 641                 ret = gspca_dev->sd_desc->start(gspca_dev);
 642                 if (ret < 0) {
 643                         destroy_urbs(gspca_dev);
 644                         goto out;
 645                 }
 646                 gspca_dev->streaming = 1;
 647
 648                 /* some bulk transfers are started by the subdriver */
 649                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 650                         break;
 651
 652                 /* submit the URBs */
 653                 for (n = 0; n < gspca_dev->nurbs; n++) {
 654                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 655                         if (ret < 0)
 656                                 break;
 657                 }
 658                 if (ret >= 0)
 659                         break;
 660                 gspca_dev->streaming = 0;
 661                 destroy_urbs(gspca_dev);
 662                 if (ret != -ENOSPC) {
 663                         PDEBUG(D_ERR|D_STREAM,
 664                                 "usb_submit_urb alt %d err %d",
 665                                 gspca_dev->alt, ret);
 666                         goto out;
 667                 }
 668
 669                 /* the bandwidth is not wide enough
 670                  * negociate or try a lower alternate setting */
 671                 PDEBUG(D_ERR|D_STREAM,
 672                         "bandwidth not wide enough - trying again");
 673                 msleep(20);     /* wait for kill complete */
 674                 if (gspca_dev->sd_desc->isoc_nego) {
 675                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 676                         if (ret < 0)
 677                                 goto out;
 678                 } else {
 679                         ep = get_ep(gspca_dev);
 680                         if (ep == NULL) {
 681                                 ret = -EIO;
 682                                 goto out;
 683                         }
 684                 }
 685         }
 686 out:
 687         mutex_unlock(&gspca_dev->usb_lock);
 688         return ret;
 689 }
 690
 691 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 692 {
 693         int ret;
 694
 695         if (gspca_dev->alt == 0)
 696                 return 0;
 697         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 698         if (ret < 0)
 699                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 700         return ret;
 701 }
 702
 703 /* Note: both the queue and the usb locks should be held when calling this */
 704 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 705 {
 706         gspca_dev->streaming = 0;
 707         if (gspca_dev->present) {
 708                 if (gspca_dev->sd_desc->stopN)
 709                         gspca_dev->sd_desc->stopN(gspca_dev);
 710                 destroy_urbs(gspca_dev);
 711                 gspca_set_alt0(gspca_dev);
 712         }
 713
 714         /* always call stop0 to free the subdriver's resources */
 715         if (gspca_dev->sd_desc->stop0)
 716                 gspca_dev->sd_desc->stop0(gspca_dev);
 717         PDEBUG(D_STREAM, "stream off OK");
 718 }
 719
 720 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 721 {
 722         int i;
 723
 724         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 725         gspca_dev->curr_mode = i;
 726         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 727         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 728         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 729 }
 730
 731 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 732                         int width, int height)
 733 {
 734         int i;
 735
 736         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 737                 if (width >= gspca_dev->cam.cam_mode[i].width
 738                     && height >= gspca_dev->cam.cam_mode[i].height)
 739                         break;
 740         }
 741         return i;
 742 }
 743
 744 /*
 745  * search a mode with the right pixel format
 746  */
 747 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 748                         int mode,
 749                         int pixfmt)
 750 {
 751         int modeU, modeD;
 752
 753         modeU = modeD = mode;
 754         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 755                 if (--modeD >= 0) {
 756                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 757                                                                 == pixfmt)
 758                                 return modeD;
 759                 }
 760                 if (++modeU < gspca_dev->cam.nmodes) {
 761                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 762                                                                 == pixfmt)
 763                                 return modeU;
 764                 }
 765         }
 766         return -EINVAL;
 767 }
 768
 769 #ifdef CONFIG_VIDEO_ADV_DEBUG
 770 static int vidioc_g_register(struct file *file, void *priv,
 771                         struct v4l2_dbg_register *reg)
 772 {
 773         int ret;
 774         struct gspca_dev *gspca_dev = priv;
 775
 776         if (!gspca_dev->sd_desc->get_chip_ident)
 777                 return -EINVAL;
 778
 779         if (!gspca_dev->sd_desc->get_register)
 780                 return -EINVAL;
 781
 782         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 783                 return -ERESTARTSYS;
 784         if (gspca_dev->present)
 785                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 786         else
 787                 ret = -ENODEV;
 788         mutex_unlock(&gspca_dev->usb_lock);
 789
 790         return ret;
 791 }
 792
 793 static int vidioc_s_register(struct file *file, void *priv,
 794                         struct v4l2_dbg_register *reg)
 795 {
 796         int ret;
 797         struct gspca_dev *gspca_dev = priv;
 798
 799         if (!gspca_dev->sd_desc->get_chip_ident)
 800                 return -EINVAL;
 801
 802         if (!gspca_dev->sd_desc->set_register)
 803                 return -EINVAL;
 804
 805         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 806                 return -ERESTARTSYS;
 807         if (gspca_dev->present)
 808                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 809         else
 810                 ret = -ENODEV;
 811         mutex_unlock(&gspca_dev->usb_lock);
 812
 813         return ret;
 814 }
 815 #endif
 816
 817 static int vidioc_g_chip_ident(struct file *file, void *priv,
 818                         struct v4l2_dbg_chip_ident *chip)
 819 {
 820         int ret;
 821         struct gspca_dev *gspca_dev = priv;
 822
 823         if (!gspca_dev->sd_desc->get_chip_ident)
 824                 return -EINVAL;
 825
 826         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 827                 return -ERESTARTSYS;
 828         if (gspca_dev->present)
 829                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 830         else
 831                 ret = -ENODEV;
 832         mutex_unlock(&gspca_dev->usb_lock);
 833
 834         return ret;
 835 }
 836
 837 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 838                                 struct v4l2_fmtdesc *fmtdesc)
 839 {
 840         struct gspca_dev *gspca_dev = priv;
 841         int i, j, index;
 842         __u32 fmt_tb[8];
 843
 844         /* give an index to each format */
 845         index = 0;
 846         j = 0;
 847         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 848                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 849                 j = 0;
 850                 for (;;) {
 851                         if (fmt_tb[j] == fmt_tb[index])
 852                                 break;
 853                         j++;
 854                 }
 855                 if (j == index) {
 856                         if (fmtdesc->index == index)
 857                                 break;          /* new format */
 858                         index++;
 859                         if (index >= ARRAY_SIZE(fmt_tb))
 860                                 return -EINVAL;
 861                 }
 862         }
 863         if (i < 0)
 864                 return -EINVAL;         /* no more format */
 865
 866         fmtdesc->pixelformat = fmt_tb[index];
 867         if (gspca_is_compressed(fmt_tb[index]))
 868                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 869         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 870         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 871         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 872         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 873         fmtdesc->description[4] = '\0';
 874         return 0;
 875 }
 876
 877 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 878                             struct v4l2_format *fmt)
 879 {
 880         struct gspca_dev *gspca_dev = priv;
 881         int mode;
 882
 883         mode = gspca_dev->curr_mode;
 884         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 885                 sizeof fmt->fmt.pix);
 886         return 0;
 887 }
 888
 889 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 890                         struct v4l2_format *fmt)
 891 {
 892         int w, h, mode, mode2;
 893
 894         w = fmt->fmt.pix.width;
 895         h = fmt->fmt.pix.height;
 896
 897 #ifdef GSPCA_DEBUG
 898         if (gspca_debug & D_CONF)
 899                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 900 #endif
 901         /* search the closest mode for width and height */
 902         mode = wxh_to_mode(gspca_dev, w, h);
 903
 904         /* OK if right palette */
 905         if (gspca_dev->cam.cam_mode[mode].pixelformat
 906                                                 != fmt->fmt.pix.pixelformat) {
 907
 908                 /* else, search the closest mode with the same pixel format */
 909                 mode2 = gspca_get_mode(gspca_dev, mode,
 910                                         fmt->fmt.pix.pixelformat);
 911                 if (mode2 >= 0)
 912                         mode = mode2;
 913 /*              else
 914                         ;                * no chance, return this mode */
 915         }
 916         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 917                 sizeof fmt->fmt.pix);
 918         return mode;                    /* used when s_fmt */
 919 }
 920
 921 static int vidioc_try_fmt_vid_cap(struct file *file,
 922                               void *priv,
 923                               struct v4l2_format *fmt)
 924 {
 925         struct gspca_dev *gspca_dev = priv;
 926         int ret;
 927
 928         ret = try_fmt_vid_cap(gspca_dev, fmt);
 929         if (ret < 0)
 930                 return ret;
 931         return 0;
 932 }
 933
 934 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 935                             struct v4l2_format *fmt)
 936 {
 937         struct gspca_dev *gspca_dev = priv;
 938         int ret;
 939
 940         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 941                 return -ERESTARTSYS;
 942
 943         ret = try_fmt_vid_cap(gspca_dev, fmt);
 944         if (ret < 0)
 945                 goto out;
 946
 947         if (gspca_dev->nframes != 0
 948             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 949                 ret = -EINVAL;
 950                 goto out;
 951         }
 952
 953         if (ret == gspca_dev->curr_mode) {
 954                 ret = 0;
 955                 goto out;                       /* same mode */
 956         }
 957
 958         if (gspca_dev->streaming) {
 959                 ret = -EBUSY;
 960                 goto out;
 961         }
 962         gspca_dev->width = fmt->fmt.pix.width;
 963         gspca_dev->height = fmt->fmt.pix.height;
 964         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 965         gspca_dev->curr_mode = ret;
 966
 967         ret = 0;
 968 out:
 969         mutex_unlock(&gspca_dev->queue_lock);
 970         return ret;
 971 }
 972
 973 static int vidioc_enum_framesizes(struct file *file, void *priv,
 974                                   struct v4l2_frmsizeenum *fsize)
 975 {
 976         struct gspca_dev *gspca_dev = priv;
 977         int i;
 978         __u32 index = 0;
 979
 980         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 981                 if (fsize->pixel_format !=
 982                                 gspca_dev->cam.cam_mode[i].pixelformat)
 983                         continue;
 984
 985                 if (fsize->index == index) {
 986                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 987                         fsize->discrete.width =
 988                                 gspca_dev->cam.cam_mode[i].width;
 989                         fsize->discrete.height =
 990                                 gspca_dev->cam.cam_mode[i].height;
 991                         return 0;
 992                 }
 993                 index++;
 994         }
 995
 996         return -EINVAL;
 997 }
 998
 999 static void gspca_release(struct video_device *vfd)
1000 {
1001         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1002
1003         PDEBUG(D_PROBE, "/dev/video%d released", gspca_dev->vdev.num);
1004
1005         kfree(gspca_dev->usb_buf);
1006         kfree(gspca_dev);
1007 }
1008
1009 static int dev_open(struct file *file)
1010 {
1011         struct gspca_dev *gspca_dev;
1012         int ret;
1013
1014         PDEBUG(D_STREAM, "[%s] open", current->comm);
1015         gspca_dev = (struct gspca_dev *) video_devdata(file);
1016         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1017                 return -ERESTARTSYS;
1018         if (!gspca_dev->present) {
1019                 ret = -ENODEV;
1020                 goto out;
1021         }
1022
1023         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1024                 ret = -EBUSY;
1025                 goto out;
1026         }
1027
1028         /* protect the subdriver against rmmod */
1029         if (!try_module_get(gspca_dev->module)) {
1030                 ret = -ENODEV;
1031                 goto out;
1032         }
1033
1034         gspca_dev->users++;
1035
1036         file->private_data = gspca_dev;
1037 #ifdef GSPCA_DEBUG
1038         /* activate the v4l2 debug */
1039         if (gspca_debug & D_V4L2)
1040                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1041                                         | V4L2_DEBUG_IOCTL_ARG;
1042         else
1043                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1044                                         | V4L2_DEBUG_IOCTL_ARG);
1045 #endif
1046         ret = 0;
1047 out:
1048         mutex_unlock(&gspca_dev->queue_lock);
1049         if (ret != 0)
1050                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1051         else
1052                 PDEBUG(D_STREAM, "open done");
1053         return ret;
1054 }
1055
1056 static int dev_close(struct file *file)
1057 {
1058         struct gspca_dev *gspca_dev = file->private_data;
1059
1060         PDEBUG(D_STREAM, "[%s] close", current->comm);
1061         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1062                 return -ERESTARTSYS;
1063         gspca_dev->users--;
1064
1065         /* if the file did the capture, free the streaming resources */
1066         if (gspca_dev->capt_file == file) {
1067                 if (gspca_dev->streaming) {
1068                         mutex_lock(&gspca_dev->usb_lock);
1069                         gspca_stream_off(gspca_dev);
1070                         mutex_unlock(&gspca_dev->usb_lock);
1071                 }
1072                 frame_free(gspca_dev);
1073                 gspca_dev->capt_file = NULL;
1074                 gspca_dev->memory = GSPCA_MEMORY_NO;
1075         }
1076         file->private_data = NULL;
1077         module_put(gspca_dev->module);
1078         mutex_unlock(&gspca_dev->queue_lock);
1079
1080         PDEBUG(D_STREAM, "close done");
1081
1082         return 0;
1083 }
1084
1085 static int vidioc_querycap(struct file *file, void  *priv,
1086                            struct v4l2_capability *cap)
1087 {
1088         struct gspca_dev *gspca_dev = priv;
1089         int ret;
1090
1091         /* protect the access to the usb device */
1092         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1093                 return -ERESTARTSYS;
1094         if (!gspca_dev->present) {
1095                 ret = -ENODEV;
1096                 goto out;
1097         }
1098         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1099         if (gspca_dev->dev->product != NULL) {
1100                 strncpy(cap->card, gspca_dev->dev->product,
1101                         sizeof cap->card);
1102         } else {
1103                 snprintf(cap->card, sizeof cap->card,
1104                         "USB Camera (%04x:%04x)",
1105                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1106                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1107         }
1108         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1109         cap->version = DRIVER_VERSION_NUMBER;
1110         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1111                           | V4L2_CAP_STREAMING
1112                           | V4L2_CAP_READWRITE;
1113         ret = 0;
1114 out:
1115         mutex_unlock(&gspca_dev->usb_lock);
1116         return ret;
1117 }
1118
1119 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1120                                    int id)
1121 {
1122         const struct ctrl *ctrls;
1123         int i;
1124
1125         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1126              i < gspca_dev->sd_desc->nctrls;
1127              i++, ctrls++) {
1128                 if (gspca_dev->ctrl_dis & (1 << i))
1129                         continue;
1130                 if (id == ctrls->qctrl.id)
1131                         return ctrls;
1132         }
1133         return NULL;
1134 }
1135
1136 static int vidioc_queryctrl(struct file *file, void *priv,
1137                            struct v4l2_queryctrl *q_ctrl)
1138 {
1139         struct gspca_dev *gspca_dev = priv;
1140         const struct ctrl *ctrls;
1141         int i;
1142         u32 id;
1143
1144         ctrls = NULL;
1145         id = q_ctrl->id;
1146         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1147                 id &= V4L2_CTRL_ID_MASK;
1148                 id++;
1149                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1150                         if (gspca_dev->ctrl_dis & (1 << i))
1151                                 continue;
1152                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1153                                 continue;
1154                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1155                                             > ctrls->qctrl.id)
1156                                 continue;
1157                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1158                 }
1159         } else {
1160                 ctrls = get_ctrl(gspca_dev, id);
1161                 i = ctrls - gspca_dev->sd_desc->ctrls;
1162         }
1163         if (ctrls == NULL)
1164                 return -EINVAL;
1165         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1166         if (gspca_dev->ctrl_inac & (1 << i))
1167                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1168         return 0;
1169 }
1170
1171 static int vidioc_s_ctrl(struct file *file, void *priv,
1172                          struct v4l2_control *ctrl)
1173 {
1174         struct gspca_dev *gspca_dev = priv;
1175         const struct ctrl *ctrls;
1176         int ret;
1177
1178         ctrls = get_ctrl(gspca_dev, ctrl->id);
1179         if (ctrls == NULL)
1180                 return -EINVAL;
1181
1182         if (ctrl->value < ctrls->qctrl.minimum
1183             || ctrl->value > ctrls->qctrl.maximum)
1184                 return -ERANGE;
1185         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1186         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1187                 return -ERESTARTSYS;
1188         if (gspca_dev->present)
1189                 ret = ctrls->set(gspca_dev, ctrl->value);
1190         else
1191                 ret = -ENODEV;
1192         mutex_unlock(&gspca_dev->usb_lock);
1193         return ret;
1194 }
1195
1196 static int vidioc_g_ctrl(struct file *file, void *priv,
1197                          struct v4l2_control *ctrl)
1198 {
1199         struct gspca_dev *gspca_dev = priv;
1200         const struct ctrl *ctrls;
1201         int ret;
1202
1203         ctrls = get_ctrl(gspca_dev, ctrl->id);
1204         if (ctrls == NULL)
1205                 return -EINVAL;
1206
1207         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1208                 return -ERESTARTSYS;
1209         if (gspca_dev->present)
1210                 ret = ctrls->get(gspca_dev, &ctrl->value);
1211         else
1212                 ret = -ENODEV;
1213         mutex_unlock(&gspca_dev->usb_lock);
1214         return ret;
1215 }
1216
1217 /*fixme: have an audio flag in gspca_dev?*/
1218 static int vidioc_s_audio(struct file *file, void *priv,
1219                          struct v4l2_audio *audio)
1220 {
1221         if (audio->index != 0)
1222                 return -EINVAL;
1223         return 0;
1224 }
1225
1226 static int vidioc_g_audio(struct file *file, void *priv,
1227                          struct v4l2_audio *audio)
1228 {
1229         strcpy(audio->name, "Microphone");
1230         return 0;
1231 }
1232
1233 static int vidioc_enumaudio(struct file *file, void *priv,
1234                          struct v4l2_audio *audio)
1235 {
1236         if (audio->index != 0)
1237                 return -EINVAL;
1238
1239         strcpy(audio->name, "Microphone");
1240         audio->capability = 0;
1241         audio->mode = 0;
1242         return 0;
1243 }
1244
1245 static int vidioc_querymenu(struct file *file, void *priv,
1246                             struct v4l2_querymenu *qmenu)
1247 {
1248         struct gspca_dev *gspca_dev = priv;
1249
1250         if (!gspca_dev->sd_desc->querymenu)
1251                 return -EINVAL;
1252         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1253 }
1254
1255 static int vidioc_enum_input(struct file *file, void *priv,
1256                                 struct v4l2_input *input)
1257 {
1258         struct gspca_dev *gspca_dev = priv;
1259
1260         if (input->index != 0)
1261                 return -EINVAL;
1262         input->type = V4L2_INPUT_TYPE_CAMERA;
1263         input->status = gspca_dev->cam.input_flags;
1264         strncpy(input->name, gspca_dev->sd_desc->name,
1265                 sizeof input->name);
1266         return 0;
1267 }
1268
1269 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1270 {
1271         *i = 0;
1272         return 0;
1273 }
1274
1275 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1276 {
1277         if (i > 0)
1278                 return -EINVAL;
1279         return (0);
1280 }
1281
1282 static int vidioc_reqbufs(struct file *file, void *priv,
1283                           struct v4l2_requestbuffers *rb)
1284 {
1285         struct gspca_dev *gspca_dev = priv;
1286         int i, ret = 0;
1287
1288         switch (rb->memory) {
1289         case GSPCA_MEMORY_READ:                 /* (internal call) */
1290         case V4L2_MEMORY_MMAP:
1291         case V4L2_MEMORY_USERPTR:
1292                 break;
1293         default:
1294                 return -EINVAL;
1295         }
1296         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1297                 return -ERESTARTSYS;
1298
1299         if (gspca_dev->memory != GSPCA_MEMORY_NO
1300             && gspca_dev->memory != rb->memory) {
1301                 ret = -EBUSY;
1302                 goto out;
1303         }
1304
1305         /* only one file may do the capture */
1306         if (gspca_dev->capt_file != NULL
1307             && gspca_dev->capt_file != file) {
1308                 ret = -EBUSY;
1309                 goto out;
1310         }
1311
1312         /* if allocated, the buffers must not be mapped */
1313         for (i = 0; i < gspca_dev->nframes; i++) {
1314                 if (gspca_dev->frame[i].vma_use_count) {
1315                         ret = -EBUSY;
1316                         goto out;
1317                 }
1318         }
1319
1320         /* stop streaming */
1321         if (gspca_dev->streaming) {
1322                 mutex_lock(&gspca_dev->usb_lock);
1323                 gspca_stream_off(gspca_dev);
1324                 mutex_unlock(&gspca_dev->usb_lock);
1325         }
1326
1327         /* free the previous allocated buffers, if any */
1328         if (gspca_dev->nframes != 0) {
1329                 frame_free(gspca_dev);
1330                 gspca_dev->capt_file = NULL;
1331         }
1332         if (rb->count == 0)                     /* unrequest */
1333                 goto out;
1334         gspca_dev->memory = rb->memory;
1335         ret = frame_alloc(gspca_dev, rb->count);
1336         if (ret == 0) {
1337                 rb->count = gspca_dev->nframes;
1338                 gspca_dev->capt_file = file;
1339         }
1340 out:
1341         mutex_unlock(&gspca_dev->queue_lock);
1342         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1343         return ret;
1344 }
1345
1346 static int vidioc_querybuf(struct file *file, void *priv,
1347                            struct v4l2_buffer *v4l2_buf)
1348 {
1349         struct gspca_dev *gspca_dev = priv;
1350         struct gspca_frame *frame;
1351
1352         if (v4l2_buf->index < 0
1353             || v4l2_buf->index >= gspca_dev->nframes)
1354                 return -EINVAL;
1355
1356         frame = &gspca_dev->frame[v4l2_buf->index];
1357         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1358         return 0;
1359 }
1360
1361 static int vidioc_streamon(struct file *file, void *priv,
1362                            enum v4l2_buf_type buf_type)
1363 {
1364         struct gspca_dev *gspca_dev = priv;
1365         int ret;
1366
1367         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1368                 return -EINVAL;
1369         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1370                 return -ERESTARTSYS;
1371
1372         if (gspca_dev->nframes == 0
1373             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1374                 ret = -EINVAL;
1375                 goto out;
1376         }
1377         if (!gspca_dev->streaming) {
1378                 ret = gspca_init_transfer(gspca_dev);
1379                 if (ret < 0)
1380                         goto out;
1381         }
1382 #ifdef GSPCA_DEBUG
1383         if (gspca_debug & D_STREAM) {
1384                 PDEBUG_MODE("stream on OK",
1385                         gspca_dev->pixfmt,
1386                         gspca_dev->width,
1387                         gspca_dev->height);
1388         }
1389 #endif
1390         ret = 0;
1391 out:
1392         mutex_unlock(&gspca_dev->queue_lock);
1393         return ret;
1394 }
1395
1396 static int vidioc_streamoff(struct file *file, void *priv,
1397                                 enum v4l2_buf_type buf_type)
1398 {
1399         struct gspca_dev *gspca_dev = priv;
1400         int i, ret;
1401
1402         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1403                 return -EINVAL;
1404         if (!gspca_dev->streaming)
1405                 return 0;
1406         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1407                 return -ERESTARTSYS;
1408
1409         /* stop streaming */
1410         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1411                 ret = -ERESTARTSYS;
1412                 goto out;
1413         }
1414         gspca_stream_off(gspca_dev);
1415         mutex_unlock(&gspca_dev->usb_lock);
1416
1417         /* empty the application queues */
1418         for (i = 0; i < gspca_dev->nframes; i++)
1419                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1420         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1421         gspca_dev->last_packet_type = DISCARD_PACKET;
1422         gspca_dev->sequence = 0;
1423         ret = 0;
1424 out:
1425         mutex_unlock(&gspca_dev->queue_lock);
1426         return ret;
1427 }
1428
1429 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1430                         struct v4l2_jpegcompression *jpegcomp)
1431 {
1432         struct gspca_dev *gspca_dev = priv;
1433         int ret;
1434
1435         if (!gspca_dev->sd_desc->get_jcomp)
1436                 return -EINVAL;
1437         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1438                 return -ERESTARTSYS;
1439         if (gspca_dev->present)
1440                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1441         else
1442                 ret = -ENODEV;
1443         mutex_unlock(&gspca_dev->usb_lock);
1444         return ret;
1445 }
1446
1447 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1448                         struct v4l2_jpegcompression *jpegcomp)
1449 {
1450         struct gspca_dev *gspca_dev = priv;
1451         int ret;
1452
1453         if (!gspca_dev->sd_desc->set_jcomp)
1454                 return -EINVAL;
1455         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1456                 return -ERESTARTSYS;
1457         if (gspca_dev->present)
1458                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1459         else
1460                 ret = -ENODEV;
1461         mutex_unlock(&gspca_dev->usb_lock);
1462         return ret;
1463 }
1464
1465 static int vidioc_g_parm(struct file *filp, void *priv,
1466                         struct v4l2_streamparm *parm)
1467 {
1468         struct gspca_dev *gspca_dev = priv;
1469
1470         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1471
1472         if (gspca_dev->sd_desc->get_streamparm) {
1473                 int ret;
1474
1475                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1476                         return -ERESTARTSYS;
1477                 if (gspca_dev->present)
1478                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1479                                                                  parm);
1480                 else
1481                         ret = -ENODEV;
1482                 mutex_unlock(&gspca_dev->usb_lock);
1483                 return ret;
1484         }
1485
1486         return 0;
1487 }
1488
1489 static int vidioc_s_parm(struct file *filp, void *priv,
1490                         struct v4l2_streamparm *parm)
1491 {
1492         struct gspca_dev *gspca_dev = priv;
1493         int n;
1494
1495         n = parm->parm.capture.readbuffers;
1496         if (n == 0 || n > GSPCA_MAX_FRAMES)
1497                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1498         else
1499                 gspca_dev->nbufread = n;
1500
1501         if (gspca_dev->sd_desc->set_streamparm) {
1502                 int ret;
1503
1504                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1505                         return -ERESTARTSYS;
1506                 if (gspca_dev->present)
1507                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1508                                                                  parm);
1509                 else
1510                         ret = -ENODEV;
1511                 mutex_unlock(&gspca_dev->usb_lock);
1512                 return ret;
1513         }
1514
1515         return 0;
1516 }
1517
1518 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1519 static int vidiocgmbuf(struct file *file, void *priv,
1520                         struct video_mbuf *mbuf)
1521 {
1522         struct gspca_dev *gspca_dev = file->private_data;
1523         int i;
1524
1525         PDEBUG(D_STREAM, "cgmbuf");
1526         if (gspca_dev->nframes == 0) {
1527                 int ret;
1528
1529                 {
1530                         struct v4l2_format fmt;
1531
1532                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1533                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1534                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1535                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1536                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1537                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1538                         if (ret != 0)
1539                                 return ret;
1540                 }
1541                 {
1542                         struct v4l2_requestbuffers rb;
1543
1544                         memset(&rb, 0, sizeof rb);
1545                         rb.count = 4;
1546                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1547                         rb.memory = V4L2_MEMORY_MMAP;
1548                         ret = vidioc_reqbufs(file, priv, &rb);
1549                         if (ret != 0)
1550                                 return ret;
1551                 }
1552         }
1553         mbuf->frames = gspca_dev->nframes;
1554         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1555         for (i = 0; i < mbuf->frames; i++)
1556                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1557         return 0;
1558 }
1559 #endif
1560
1561 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1562 {
1563         struct gspca_dev *gspca_dev = file->private_data;
1564         struct gspca_frame *frame;
1565         struct page *page;
1566         unsigned long addr, start, size;
1567         int i, ret;
1568
1569         start = vma->vm_start;
1570         size = vma->vm_end - vma->vm_start;
1571         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1572
1573         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1574                 return -ERESTARTSYS;
1575         if (!gspca_dev->present) {
1576                 ret = -ENODEV;
1577                 goto out;
1578         }
1579         if (gspca_dev->capt_file != file) {
1580                 ret = -EINVAL;
1581                 goto out;
1582         }
1583
1584         frame = NULL;
1585         for (i = 0; i < gspca_dev->nframes; ++i) {
1586                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1587                         PDEBUG(D_STREAM, "mmap bad memory type");
1588                         break;
1589                 }
1590                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1591                                                 == vma->vm_pgoff) {
1592                         frame = &gspca_dev->frame[i];
1593                         break;
1594                 }
1595         }
1596         if (frame == NULL) {
1597                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1598                 ret = -EINVAL;
1599                 goto out;
1600         }
1601 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1602         /* v4l1 maps all the buffers */
1603         if (i != 0
1604             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1605 #endif
1606             if (size != frame->v4l2_buf.length) {
1607                 PDEBUG(D_STREAM, "mmap bad size");
1608                 ret = -EINVAL;
1609                 goto out;
1610         }
1611
1612         /*
1613          * - VM_IO marks the area as being a mmaped region for I/O to a
1614          *   device. It also prevents the region from being core dumped.
1615          */
1616         vma->vm_flags |= VM_IO;
1617
1618         addr = (unsigned long) frame->data;
1619         while (size > 0) {
1620                 page = vmalloc_to_page((void *) addr);
1621                 ret = vm_insert_page(vma, start, page);
1622                 if (ret < 0)
1623                         goto out;
1624                 start += PAGE_SIZE;
1625                 addr += PAGE_SIZE;
1626                 size -= PAGE_SIZE;
1627         }
1628
1629         vma->vm_ops = (struct vm_operations_struct *) &gspca_vm_ops;
1630         vma->vm_private_data = frame;
1631         gspca_vm_open(vma);
1632         ret = 0;
1633 out:
1634         mutex_unlock(&gspca_dev->queue_lock);
1635         return ret;
1636 }
1637
1638 /*
1639  * wait for a video frame
1640  *
1641  * If a frame is ready, its index is returned.
1642  */
1643 static int frame_wait(struct gspca_dev *gspca_dev,
1644                         int nonblock_ing)
1645 {
1646         struct gspca_frame *frame;
1647         int i, j, ret;
1648
1649         /* check if a frame is ready */
1650         i = gspca_dev->fr_o;
1651         j = gspca_dev->fr_queue[i];
1652         frame = &gspca_dev->frame[j];
1653
1654         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1655                 if (nonblock_ing)
1656                         return -EAGAIN;
1657
1658                 /* wait till a frame is ready */
1659                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1660                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1661                         !gspca_dev->streaming || !gspca_dev->present,
1662                         msecs_to_jiffies(3000));
1663                 if (ret < 0)
1664                         return ret;
1665                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1666                         return -EIO;
1667         }
1668
1669         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1670         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1671                 gspca_dev->fr_q,
1672                 gspca_dev->fr_i,
1673                 gspca_dev->fr_o);
1674
1675         if (gspca_dev->sd_desc->dq_callback) {
1676                 mutex_lock(&gspca_dev->usb_lock);
1677                 if (gspca_dev->present)
1678                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1679                 mutex_unlock(&gspca_dev->usb_lock);
1680         }
1681         return j;
1682 }
1683
1684 /*
1685  * dequeue a video buffer
1686  *
1687  * If nonblock_ing is false, block until a buffer is available.
1688  */
1689 static int vidioc_dqbuf(struct file *file, void *priv,
1690                         struct v4l2_buffer *v4l2_buf)
1691 {
1692         struct gspca_dev *gspca_dev = priv;
1693         struct gspca_frame *frame;
1694         int i, ret;
1695
1696         PDEBUG(D_FRAM, "dqbuf");
1697         if (v4l2_buf->memory != gspca_dev->memory)
1698                 return -EINVAL;
1699
1700         if (!gspca_dev->present)
1701                 return -ENODEV;
1702
1703         /* if not streaming, be sure the application will not loop forever */
1704         if (!(file->f_flags & O_NONBLOCK)
1705             && !gspca_dev->streaming && gspca_dev->users == 1)
1706                 return -EINVAL;
1707
1708         /* only the capturing file may dequeue */
1709         if (gspca_dev->capt_file != file)
1710                 return -EINVAL;
1711
1712         /* only one dequeue / read at a time */
1713         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1714                 return -ERESTARTSYS;
1715
1716         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1717         if (ret < 0)
1718                 goto out;
1719         i = ret;                                /* frame index */
1720         frame = &gspca_dev->frame[i];
1721         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1722                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1723                                  frame->data,
1724                                  frame->v4l2_buf.bytesused)) {
1725                         PDEBUG(D_ERR|D_STREAM,
1726                                 "dqbuf cp to user failed");
1727                         ret = -EFAULT;
1728                         goto out;
1729                 }
1730         }
1731         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1732         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1733         PDEBUG(D_FRAM, "dqbuf %d", i);
1734         ret = 0;
1735 out:
1736         mutex_unlock(&gspca_dev->read_lock);
1737         return ret;
1738 }
1739
1740 /*
1741  * queue a video buffer
1742  *
1743  * Attempting to queue a buffer that has already been
1744  * queued will return -EINVAL.
1745  */
1746 static int vidioc_qbuf(struct file *file, void *priv,
1747                         struct v4l2_buffer *v4l2_buf)
1748 {
1749         struct gspca_dev *gspca_dev = priv;
1750         struct gspca_frame *frame;
1751         int i, index, ret;
1752
1753         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1754
1755         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1756                 return -ERESTARTSYS;
1757
1758         index = v4l2_buf->index;
1759         if ((unsigned) index >= gspca_dev->nframes) {
1760                 PDEBUG(D_FRAM,
1761                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1762                 ret = -EINVAL;
1763                 goto out;
1764         }
1765         if (v4l2_buf->memory != gspca_dev->memory) {
1766                 PDEBUG(D_FRAM, "qbuf bad memory type");
1767                 ret = -EINVAL;
1768                 goto out;
1769         }
1770
1771         frame = &gspca_dev->frame[index];
1772         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1773                 PDEBUG(D_FRAM, "qbuf bad state");
1774                 ret = -EINVAL;
1775                 goto out;
1776         }
1777
1778         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1779
1780         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1781                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1782                 frame->v4l2_buf.length = v4l2_buf->length;
1783         }
1784
1785         /* put the buffer in the 'queued' queue */
1786         i = gspca_dev->fr_q;
1787         gspca_dev->fr_queue[i] = index;
1788         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1789         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1790                 gspca_dev->fr_q,
1791                 gspca_dev->fr_i,
1792                 gspca_dev->fr_o);
1793
1794         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1795         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1796         ret = 0;
1797 out:
1798         mutex_unlock(&gspca_dev->queue_lock);
1799         return ret;
1800 }
1801
1802 /*
1803  * allocate the resources for read()
1804  */
1805 static int read_alloc(struct gspca_dev *gspca_dev,
1806                         struct file *file)
1807 {
1808         struct v4l2_buffer v4l2_buf;
1809         int i, ret;
1810
1811         PDEBUG(D_STREAM, "read alloc");
1812         if (gspca_dev->nframes == 0) {
1813                 struct v4l2_requestbuffers rb;
1814
1815                 memset(&rb, 0, sizeof rb);
1816                 rb.count = gspca_dev->nbufread;
1817                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1818                 rb.memory = GSPCA_MEMORY_READ;
1819                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1820                 if (ret != 0) {
1821                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1822                         return ret;
1823                 }
1824                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1825                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1826                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1827                 for (i = 0; i < gspca_dev->nbufread; i++) {
1828                         v4l2_buf.index = i;
1829                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1830                         if (ret != 0) {
1831                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1832                                 return ret;
1833                         }
1834                 }
1835                 gspca_dev->memory = GSPCA_MEMORY_READ;
1836         }
1837
1838         /* start streaming */
1839         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1840         if (ret != 0)
1841                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1842         return ret;
1843 }
1844
1845 static unsigned int dev_poll(struct file *file, poll_table *wait)
1846 {
1847         struct gspca_dev *gspca_dev = file->private_data;
1848         int i, ret;
1849
1850         PDEBUG(D_FRAM, "poll");
1851
1852         poll_wait(file, &gspca_dev->wq, wait);
1853
1854         /* if reqbufs is not done, the user would use read() */
1855         if (gspca_dev->nframes == 0) {
1856                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1857                         return POLLERR;         /* not the 1st time */
1858                 ret = read_alloc(gspca_dev, file);
1859                 if (ret != 0)
1860                         return POLLERR;
1861         }
1862
1863         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1864                 return POLLERR;
1865
1866         /* check the next incoming buffer */
1867         i = gspca_dev->fr_o;
1868         i = gspca_dev->fr_queue[i];
1869         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1870                 ret = POLLIN | POLLRDNORM;      /* something to read */
1871         else
1872                 ret = 0;
1873         mutex_unlock(&gspca_dev->queue_lock);
1874         if (!gspca_dev->present)
1875                 return POLLHUP;
1876         return ret;
1877 }
1878
1879 static ssize_t dev_read(struct file *file, char __user *data,
1880                     size_t count, loff_t *ppos)
1881 {
1882         struct gspca_dev *gspca_dev = file->private_data;
1883         struct gspca_frame *frame;
1884         struct v4l2_buffer v4l2_buf;
1885         struct timeval timestamp;
1886         int n, ret, ret2;
1887
1888         PDEBUG(D_FRAM, "read (%zd)", count);
1889         if (!gspca_dev->present)
1890                 return -ENODEV;
1891         switch (gspca_dev->memory) {
1892         case GSPCA_MEMORY_NO:                   /* first time */
1893                 ret = read_alloc(gspca_dev, file);
1894                 if (ret != 0)
1895                         return ret;
1896                 break;
1897         case GSPCA_MEMORY_READ:
1898                 if (gspca_dev->capt_file == file)
1899                         break;
1900                 /* fall thru */
1901         default:
1902                 return -EINVAL;
1903         }
1904
1905         /* get a frame */
1906         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1907         timestamp.tv_sec--;
1908         n = 2;
1909         for (;;) {
1910                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1911                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1912                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1913                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1914                 if (ret != 0) {
1915                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1916                         return ret;
1917                 }
1918
1919                 /* if the process slept for more than 1 second,
1920                  * get a newer frame */
1921                 frame = &gspca_dev->frame[v4l2_buf.index];
1922                 if (--n < 0)
1923                         break;                  /* avoid infinite loop */
1924                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1925                         break;
1926                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1927                 if (ret != 0) {
1928                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1929                         return ret;
1930                 }
1931         }
1932
1933         /* copy the frame */
1934         if (count > frame->v4l2_buf.bytesused)
1935                 count = frame->v4l2_buf.bytesused;
1936         ret = copy_to_user(data, frame->data, count);
1937         if (ret != 0) {
1938                 PDEBUG(D_ERR|D_STREAM,
1939                         "read cp to user lack %d / %zd", ret, count);
1940                 ret = -EFAULT;
1941                 goto out;
1942         }
1943         ret = count;
1944 out:
1945         /* in each case, requeue the buffer */
1946         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1947         if (ret2 != 0)
1948                 return ret2;
1949         return ret;
1950 }
1951
1952 static struct v4l2_file_operations dev_fops = {
1953         .owner = THIS_MODULE,
1954         .open = dev_open,
1955         .release = dev_close,
1956         .read = dev_read,
1957         .mmap = dev_mmap,
1958         .unlocked_ioctl = video_ioctl2,
1959         .poll   = dev_poll,
1960 };
1961
1962 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1963         .vidioc_querycap        = vidioc_querycap,
1964         .vidioc_dqbuf           = vidioc_dqbuf,
1965         .vidioc_qbuf            = vidioc_qbuf,
1966         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1967         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1968         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1969         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1970         .vidioc_streamon        = vidioc_streamon,
1971         .vidioc_queryctrl       = vidioc_queryctrl,
1972         .vidioc_g_ctrl          = vidioc_g_ctrl,
1973         .vidioc_s_ctrl          = vidioc_s_ctrl,
1974         .vidioc_g_audio         = vidioc_g_audio,
1975         .vidioc_s_audio         = vidioc_s_audio,
1976         .vidioc_enumaudio       = vidioc_enumaudio,
1977         .vidioc_querymenu       = vidioc_querymenu,
1978         .vidioc_enum_input      = vidioc_enum_input,
1979         .vidioc_g_input         = vidioc_g_input,
1980         .vidioc_s_input         = vidioc_s_input,
1981         .vidioc_reqbufs         = vidioc_reqbufs,
1982         .vidioc_querybuf        = vidioc_querybuf,
1983         .vidioc_streamoff       = vidioc_streamoff,
1984         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1985         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1986         .vidioc_g_parm          = vidioc_g_parm,
1987         .vidioc_s_parm          = vidioc_s_parm,
1988         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1989 #ifdef CONFIG_VIDEO_ADV_DEBUG
1990         .vidioc_g_register      = vidioc_g_register,
1991         .vidioc_s_register      = vidioc_s_register,
1992 #endif
1993         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1994 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1995         .vidiocgmbuf          = vidiocgmbuf,
1996 #endif
1997 };
1998
1999 static struct video_device gspca_template = {
2000         .name = "gspca main driver",
2001         .fops = &dev_fops,
2002         .ioctl_ops = &dev_ioctl_ops,
2003         .release = gspca_release,
2004         .minor = -1,
2005 };
2006
2007 /*
2008  * probe and create a new gspca device
2009  *
2010  * This function must be called by the sub-driver when it is
2011  * called for probing a new device.
2012  */
2013 int gspca_dev_probe(struct usb_interface *intf,
2014                 const struct usb_device_id *id,
2015                 const struct sd_desc *sd_desc,
2016                 int dev_size,
2017                 struct module *module)
2018 {
2019         struct usb_interface_descriptor *interface;
2020         struct gspca_dev *gspca_dev;
2021         struct usb_device *dev = interface_to_usbdev(intf);
2022         int ret;
2023
2024         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2025
2026         /* we don't handle multi-config cameras */
2027         if (dev->descriptor.bNumConfigurations != 1) {
2028                 PDEBUG(D_ERR, "Too many config");
2029                 return -ENODEV;
2030         }
2031         interface = &intf->cur_altsetting->desc;
2032         if (interface->bInterfaceNumber > 0) {
2033                 PDEBUG(D_ERR, "intf != 0");
2034                 return -ENODEV;
2035         }
2036
2037         /* create the device */
2038         if (dev_size < sizeof *gspca_dev)
2039                 dev_size = sizeof *gspca_dev;
2040         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2041         if (!gspca_dev) {
2042                 err("couldn't kzalloc gspca struct");
2043                 return -ENOMEM;
2044         }
2045         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2046         if (!gspca_dev->usb_buf) {
2047                 err("out of memory");
2048                 ret = -ENOMEM;
2049                 goto out;
2050         }
2051         gspca_dev->dev = dev;
2052         gspca_dev->iface = interface->bInterfaceNumber;
2053         gspca_dev->nbalt = intf->num_altsetting;
2054         gspca_dev->sd_desc = sd_desc;
2055         gspca_dev->nbufread = 2;
2056         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2057
2058         /* configure the subdriver and initialize the USB device */
2059         ret = sd_desc->config(gspca_dev, id);
2060         if (ret < 0)
2061                 goto out;
2062         ret = sd_desc->init(gspca_dev);
2063         if (ret < 0)
2064                 goto out;
2065         ret = gspca_set_alt0(gspca_dev);
2066         if (ret < 0)
2067                 goto out;
2068         gspca_set_default_mode(gspca_dev);
2069
2070         mutex_init(&gspca_dev->usb_lock);
2071         mutex_init(&gspca_dev->read_lock);
2072         mutex_init(&gspca_dev->queue_lock);
2073         init_waitqueue_head(&gspca_dev->wq);
2074
2075         /* init video stuff */
2076         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2077         gspca_dev->vdev.parent = &intf->dev;
2078         gspca_dev->module = module;
2079         gspca_dev->present = 1;
2080         ret = video_register_device(&gspca_dev->vdev,
2081                                   VFL_TYPE_GRABBER,
2082                                   -1);
2083         if (ret < 0) {
2084                 err("video_register_device err %d", ret);
2085                 goto out;
2086         }
2087
2088         usb_set_intfdata(intf, gspca_dev);
2089         PDEBUG(D_PROBE, "/dev/video%d created", gspca_dev->vdev.num);
2090         return 0;
2091 out:
2092         kfree(gspca_dev->usb_buf);
2093         kfree(gspca_dev);
2094         return ret;
2095 }
2096 EXPORT_SYMBOL(gspca_dev_probe);
2097
2098 /*
2099  * USB disconnection
2100  *
2101  * This function must be called by the sub-driver
2102  * when the device disconnects, after the specific resources are freed.
2103  */
2104 void gspca_disconnect(struct usb_interface *intf)
2105 {
2106         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2107
2108         PDEBUG(D_PROBE, "/dev/video%d disconnect", gspca_dev->vdev.num);
2109         mutex_lock(&gspca_dev->usb_lock);
2110         gspca_dev->present = 0;
2111
2112         if (gspca_dev->streaming) {
2113                 destroy_urbs(gspca_dev);
2114                 wake_up_interruptible(&gspca_dev->wq);
2115         }
2116
2117         /* the device is freed at exit of this function */
2118         gspca_dev->dev = NULL;
2119         mutex_unlock(&gspca_dev->usb_lock);
2120
2121         usb_set_intfdata(intf, NULL);
2122
2123         /* release the device */
2124         /* (this will call gspca_release() immediatly or on last close) */
2125         video_unregister_device(&gspca_dev->vdev);
2126
2127 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2128 }
2129 EXPORT_SYMBOL(gspca_disconnect);
2130
2131 #ifdef CONFIG_PM
2132 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2133 {
2134         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2135
2136         if (!gspca_dev->streaming)
2137                 return 0;
2138         gspca_dev->frozen = 1;          /* avoid urb error messages */
2139         if (gspca_dev->sd_desc->stopN)
2140                 gspca_dev->sd_desc->stopN(gspca_dev);
2141         destroy_urbs(gspca_dev);
2142         gspca_set_alt0(gspca_dev);
2143         if (gspca_dev->sd_desc->stop0)
2144                 gspca_dev->sd_desc->stop0(gspca_dev);
2145         return 0;
2146 }
2147 EXPORT_SYMBOL(gspca_suspend);
2148
2149 int gspca_resume(struct usb_interface *intf)
2150 {
2151         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2152
2153         gspca_dev->frozen = 0;
2154         gspca_dev->sd_desc->init(gspca_dev);
2155         if (gspca_dev->streaming)
2156                 return gspca_init_transfer(gspca_dev);
2157         return 0;
2158 }
2159 EXPORT_SYMBOL(gspca_resume);
2160 #endif
2161 /* -- cam driver utility functions -- */
2162
2163 /* auto gain and exposure algorithm based on the knee algorithm described here:
2164    http://ytse.tricolour.net/docs/LowLightOptimization.html
2165
2166    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2167    where changed. */
2168 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2169         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2170 {
2171         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2172         const struct ctrl *gain_ctrl = NULL;
2173         const struct ctrl *exposure_ctrl = NULL;
2174         const struct ctrl *autogain_ctrl = NULL;
2175         int retval = 0;
2176
2177         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2178                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2179                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2180                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2181                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2182                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2183                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2184         }
2185         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2186                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2187                         "on cam without (auto)gain/exposure");
2188                 return 0;
2189         }
2190
2191         if (gain_ctrl->get(gspca_dev, &gain) ||
2192                         exposure_ctrl->get(gspca_dev, &exposure) ||
2193                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2194                 return 0;
2195
2196         orig_gain = gain;
2197         orig_exposure = exposure;
2198
2199         /* If we are of a multiple of deadzone, do multiple steps to reach the
2200            desired lumination fast (with the risc of a slight overshoot) */
2201         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2202
2203         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2204                 avg_lum, desired_avg_lum, steps);
2205
2206         for (i = 0; i < steps; i++) {
2207                 if (avg_lum > desired_avg_lum) {
2208                         if (gain > gain_knee)
2209                                 gain--;
2210                         else if (exposure > exposure_knee)
2211                                 exposure--;
2212                         else if (gain > gain_ctrl->qctrl.default_value)
2213                                 gain--;
2214                         else if (exposure > exposure_ctrl->qctrl.minimum)
2215                                 exposure--;
2216                         else if (gain > gain_ctrl->qctrl.minimum)
2217                                 gain--;
2218                         else
2219                                 break;
2220                 } else {
2221                         if (gain < gain_ctrl->qctrl.default_value)
2222                                 gain++;
2223                         else if (exposure < exposure_knee)
2224                                 exposure++;
2225                         else if (gain < gain_knee)
2226                                 gain++;
2227                         else if (exposure < exposure_ctrl->qctrl.maximum)
2228                                 exposure++;
2229                         else if (gain < gain_ctrl->qctrl.maximum)
2230                                 gain++;
2231                         else
2232                                 break;
2233                 }
2234         }
2235
2236         if (gain != orig_gain) {
2237                 gain_ctrl->set(gspca_dev, gain);
2238                 retval = 1;
2239         }
2240         if (exposure != orig_exposure) {
2241                 exposure_ctrl->set(gspca_dev, exposure);
2242                 retval = 1;
2243         }
2244
2245         return retval;
2246 }
2247 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2248
2249 /* -- module insert / remove -- */
2250 static int __init gspca_init(void)
2251 {
2252         info("main v%d.%d.%d registered",
2253                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2254                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2255                 DRIVER_VERSION_NUMBER & 0xff);
2256         return 0;
2257 }
2258 static void __exit gspca_exit(void)
2259 {
2260         info("main deregistered");
2261 }
2262
2263 module_init(gspca_init);
2264 module_exit(gspca_exit);
2265
2266 #ifdef GSPCA_DEBUG
2267 module_param_named(debug, gspca_debug, int, 0644);
2268 MODULE_PARM_DESC(debug,
2269                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2270                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2271                 " 0x0100: v4l2");
2272 #endif