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         u8 *data;               /* address of data in the iso message */
 130         int i, len, st;
 131         cam_pkt_op pkt_scan;
 132
 133         if (urb->status != 0) {
 134                 if (urb->status == -ESHUTDOWN)
 135                         return;         /* disconnection */
 136 #ifdef CONFIG_PM
 137                 if (gspca_dev->frozen)
 138                         return;
 139 #endif
 140                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 141                 urb->status = 0;
 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 packet status and length */
 148                 len = urb->iso_frame_desc[i].actual_length;
 149                 if (len == 0) {
 150                         if (gspca_dev->empty_packet == 0)
 151                                 gspca_dev->empty_packet = 1;
 152                         continue;
 153                 }
 154                 st = urb->iso_frame_desc[i].status;
 155                 if (st) {
 156                         PDEBUG(D_ERR,
 157                                 "ISOC data error: [%d] len=%d, status=%d",
 158                                 i, len, st);
 159                         gspca_dev->last_packet_type = DISCARD_PACKET;
 160                         continue;
 161                 }
 162
 163                 /* let the packet be analyzed by the subdriver */
 164                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 165                         i, urb->iso_frame_desc[i].offset, len);
 166                 data = (u8 *) urb->transfer_buffer
 167                                         + urb->iso_frame_desc[i].offset;
 168                 pkt_scan(gspca_dev, data, len);
 169         }
 170
 171 resubmit:
 172         /* resubmit the URB */
 173         st = usb_submit_urb(urb, GFP_ATOMIC);
 174         if (st < 0)
 175                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 176 }
 177
 178 /*
 179  * ISOC message interrupt from the USB device
 180  *
 181  * Analyse each packet and call the subdriver for copy to the frame buffer.
 182  */
 183 static void isoc_irq(struct urb *urb)
 184 {
 185         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 186
 187         PDEBUG(D_PACK, "isoc irq");
 188         if (!gspca_dev->streaming)
 189                 return;
 190         fill_frame(gspca_dev, urb);
 191 }
 192
 193 /*
 194  * bulk message interrupt from the USB device
 195  */
 196 static void bulk_irq(struct urb *urb)
 197 {
 198         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 199         int st;
 200
 201         PDEBUG(D_PACK, "bulk irq");
 202         if (!gspca_dev->streaming)
 203                 return;
 204         switch (urb->status) {
 205         case 0:
 206                 break;
 207         case -ESHUTDOWN:
 208                 return;         /* disconnection */
 209         default:
 210 #ifdef CONFIG_PM
 211                 if (gspca_dev->frozen)
 212                         return;
 213 #endif
 214                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 215                 urb->status = 0;
 216                 goto resubmit;
 217         }
 218
 219         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 220         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 221                                 urb->transfer_buffer,
 222                                 urb->actual_length);
 223
 224 resubmit:
 225         /* resubmit the URB */
 226         if (gspca_dev->cam.bulk_nurbs != 0) {
 227                 st = usb_submit_urb(urb, GFP_ATOMIC);
 228                 if (st < 0)
 229                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 230         }
 231 }
 232
 233 /*
 234  * add data to the current frame
 235  *
 236  * This function is called by the subdrivers at interrupt level.
 237  *
 238  * To build a frame, these ones must add
 239  *      - one FIRST_PACKET
 240  *      - 0 or many INTER_PACKETs
 241  *      - one LAST_PACKET
 242  * DISCARD_PACKET invalidates the whole frame.
 243  * On LAST_PACKET, a new frame is returned.
 244  */
 245 void gspca_frame_add(struct gspca_dev *gspca_dev,
 246                         enum gspca_packet_type packet_type,
 247                         const u8 *data,
 248                         int len)
 249 {
 250         struct gspca_frame *frame;
 251         int i, j;
 252
 253         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 254
 255         /* check the availability of the frame buffer */
 256         frame = gspca_dev->cur_frame;
 257         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 258                                         != V4L2_BUF_FLAG_QUEUED) {
 259                 gspca_dev->last_packet_type = DISCARD_PACKET;
 260                 return;
 261         }
 262
 263         /* when start of a new frame, if the current frame buffer
 264          * is not queued, discard the whole frame */
 265         if (packet_type == FIRST_PACKET) {
 266                 frame->data_end = frame->data;
 267                 jiffies_to_timeval(get_jiffies_64(),
 268                                    &frame->v4l2_buf.timestamp);
 269                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 270         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 271                 if (packet_type == LAST_PACKET)
 272                         gspca_dev->last_packet_type = packet_type;
 273                 return;
 274         }
 275
 276         /* append the packet to the frame buffer */
 277         if (len > 0) {
 278                 if (frame->data_end - frame->data + len
 279                                                  > frame->v4l2_buf.length) {
 280                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 281                                 frame->data_end - frame->data + len,
 282                                 frame->v4l2_buf.length);
 283                         packet_type = DISCARD_PACKET;
 284                 } else {
 285                         memcpy(frame->data_end, data, len);
 286                         frame->data_end += len;
 287                 }
 288         }
 289         gspca_dev->last_packet_type = packet_type;
 290
 291         /* if last packet, wake up the application and advance in the queue */
 292         if (packet_type == LAST_PACKET) {
 293                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 294                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 295                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 296                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 297                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 298                 gspca_dev->fr_i = i;
 299                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 300                         frame->v4l2_buf.bytesused,
 301                         gspca_dev->fr_q,
 302                         i,
 303                         gspca_dev->fr_o);
 304                 j = gspca_dev->fr_queue[i];
 305                 gspca_dev->cur_frame = &gspca_dev->frame[j];
 306         }
 307 }
 308 EXPORT_SYMBOL(gspca_frame_add);
 309
 310 static int gspca_is_compressed(__u32 format)
 311 {
 312         switch (format) {
 313         case V4L2_PIX_FMT_MJPEG:
 314         case V4L2_PIX_FMT_JPEG:
 315         case V4L2_PIX_FMT_SPCA561:
 316         case V4L2_PIX_FMT_PAC207:
 317         case V4L2_PIX_FMT_MR97310A:
 318                 return 1;
 319         }
 320         return 0;
 321 }
 322
 323 static void *rvmalloc(long size)
 324 {
 325         void *mem;
 326         unsigned long adr;
 327
 328         mem = vmalloc_32(size);
 329         if (mem != NULL) {
 330                 adr = (unsigned long) mem;
 331                 while (size > 0) {
 332                         SetPageReserved(vmalloc_to_page((void *) adr));
 333                         adr += PAGE_SIZE;
 334                         size -= PAGE_SIZE;
 335                 }
 336         }
 337         return mem;
 338 }
 339
 340 static void rvfree(void *mem, long size)
 341 {
 342         unsigned long adr;
 343
 344         adr = (unsigned long) mem;
 345         while (size > 0) {
 346                 ClearPageReserved(vmalloc_to_page((void *) adr));
 347                 adr += PAGE_SIZE;
 348                 size -= PAGE_SIZE;
 349         }
 350         vfree(mem);
 351 }
 352
 353 static int frame_alloc(struct gspca_dev *gspca_dev,
 354                         unsigned int count)
 355 {
 356         struct gspca_frame *frame;
 357         unsigned int frsz;
 358         int i;
 359
 360         i = gspca_dev->curr_mode;
 361         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 362         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 363         frsz = PAGE_ALIGN(frsz);
 364         gspca_dev->frsz = frsz;
 365         if (count > GSPCA_MAX_FRAMES)
 366                 count = GSPCA_MAX_FRAMES;
 367         gspca_dev->frbuf = rvmalloc(frsz * count);
 368         if (!gspca_dev->frbuf) {
 369                 err("frame alloc failed");
 370                 return -ENOMEM;
 371         }
 372         gspca_dev->nframes = count;
 373         for (i = 0; i < count; i++) {
 374                 frame = &gspca_dev->frame[i];
 375                 frame->v4l2_buf.index = i;
 376                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 377                 frame->v4l2_buf.flags = 0;
 378                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 379                 frame->v4l2_buf.length = frsz;
 380                 frame->v4l2_buf.memory = gspca_dev->memory;
 381                 frame->v4l2_buf.sequence = 0;
 382                 frame->data = frame->data_end =
 383                                         gspca_dev->frbuf + i * frsz;
 384                 frame->v4l2_buf.m.offset = i * frsz;
 385         }
 386         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 387         gspca_dev->cur_frame = &gspca_dev->frame[0];
 388         gspca_dev->last_packet_type = DISCARD_PACKET;
 389         gspca_dev->sequence = 0;
 390         return 0;
 391 }
 392
 393 static void frame_free(struct gspca_dev *gspca_dev)
 394 {
 395         int i;
 396
 397         PDEBUG(D_STREAM, "frame free");
 398         if (gspca_dev->frbuf != NULL) {
 399                 rvfree(gspca_dev->frbuf,
 400                         gspca_dev->nframes * gspca_dev->frsz);
 401                 gspca_dev->frbuf = NULL;
 402                 for (i = 0; i < gspca_dev->nframes; i++)
 403                         gspca_dev->frame[i].data = NULL;
 404         }
 405         gspca_dev->nframes = 0;
 406 }
 407
 408 static void destroy_urbs(struct gspca_dev *gspca_dev)
 409 {
 410         struct urb *urb;
 411         unsigned int i;
 412
 413         PDEBUG(D_STREAM, "kill transfer");
 414         for (i = 0; i < MAX_NURBS; i++) {
 415                 urb = gspca_dev->urb[i];
 416                 if (urb == NULL)
 417                         break;
 418
 419                 gspca_dev->urb[i] = NULL;
 420                 usb_kill_urb(urb);
 421                 if (urb->transfer_buffer != NULL)
 422                         usb_buffer_free(gspca_dev->dev,
 423                                         urb->transfer_buffer_length,
 424                                         urb->transfer_buffer,
 425                                         urb->transfer_dma);
 426                 usb_free_urb(urb);
 427         }
 428 }
 429
 430 /*
 431  * look for an input transfer endpoint in an alternate setting
 432  */
 433 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 434                                           int xfer)
 435 {
 436         struct usb_host_endpoint *ep;
 437         int i, attr;
 438
 439         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 440                 ep = &alt->endpoint[i];
 441                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 442                 if (attr == xfer
 443                     && ep->desc.wMaxPacketSize != 0)
 444                         return ep;
 445         }
 446         return NULL;
 447 }
 448
 449 /*
 450  * look for an input (isoc or bulk) endpoint
 451  *
 452  * The endpoint is defined by the subdriver.
 453  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 454  * This routine may be called many times when the bandwidth is too small
 455  * (the bandwidth is checked on urb submit).
 456  */
 457 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 458 {
 459         struct usb_interface *intf;
 460         struct usb_host_endpoint *ep;
 461         int xfer, i, ret;
 462
 463         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 464         ep = NULL;
 465         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 466                                    : USB_ENDPOINT_XFER_ISOC;
 467         i = gspca_dev->alt;                     /* previous alt setting */
 468         if (gspca_dev->cam.reverse_alts) {
 469                 while (++i < gspca_dev->nbalt) {
 470                         ep = alt_xfer(&intf->altsetting[i], xfer);
 471                         if (ep)
 472                                 break;
 473                 }
 474         } else {
 475                 while (--i >= 0) {
 476                         ep = alt_xfer(&intf->altsetting[i], xfer);
 477                         if (ep)
 478                                 break;
 479                 }
 480         }
 481         if (ep == NULL) {
 482                 err("no transfer endpoint found");
 483                 return NULL;
 484         }
 485         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 486                         i, ep->desc.bEndpointAddress);
 487         gspca_dev->alt = i;             /* memorize the current alt setting */
 488         if (gspca_dev->nbalt > 1) {
 489                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 490                 if (ret < 0) {
 491                         err("set alt %d err %d", i, ret);
 492                         return NULL;
 493                 }
 494         }
 495         return ep;
 496 }
 497
 498 /*
 499  * create the URBs for image transfer
 500  */
 501 static int create_urbs(struct gspca_dev *gspca_dev,
 502                         struct usb_host_endpoint *ep)
 503 {
 504         struct urb *urb;
 505         int n, nurbs, i, psize, npkt, bsize;
 506
 507         /* calculate the packet size and the number of packets */
 508         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 509
 510         if (!gspca_dev->cam.bulk) {             /* isoc */
 511
 512                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 513                 if (gspca_dev->pkt_size == 0)
 514                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 515                 else
 516                         psize = gspca_dev->pkt_size;
 517                 npkt = gspca_dev->cam.npkt;
 518                 if (npkt == 0)
 519                         npkt = 32;              /* default value */
 520                 bsize = psize * npkt;
 521                 PDEBUG(D_STREAM,
 522                         "isoc %d pkts size %d = bsize:%d",
 523                         npkt, psize, bsize);
 524                 nurbs = DEF_NURBS;
 525         } else {                                /* bulk */
 526                 npkt = 0;
 527                 bsize = gspca_dev->cam.bulk_size;
 528                 if (bsize == 0)
 529                         bsize = psize;
 530                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 531                 if (gspca_dev->cam.bulk_nurbs != 0)
 532                         nurbs = gspca_dev->cam.bulk_nurbs;
 533                 else
 534                         nurbs = 1;
 535         }
 536
 537         gspca_dev->nurbs = nurbs;
 538         for (n = 0; n < nurbs; n++) {
 539                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 540                 if (!urb) {
 541                         err("usb_alloc_urb failed");
 542                         destroy_urbs(gspca_dev);
 543                         return -ENOMEM;
 544                 }
 545                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 546                                                 bsize,
 547                                                 GFP_KERNEL,
 548                                                 &urb->transfer_dma);
 549
 550                 if (urb->transfer_buffer == NULL) {
 551                         usb_free_urb(urb);
 552                         err("usb_buffer_urb failed");
 553                         destroy_urbs(gspca_dev);
 554                         return -ENOMEM;
 555                 }
 556                 gspca_dev->urb[n] = urb;
 557                 urb->dev = gspca_dev->dev;
 558                 urb->context = gspca_dev;
 559                 urb->transfer_buffer_length = bsize;
 560                 if (npkt != 0) {                /* ISOC */
 561                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 562                                                     ep->desc.bEndpointAddress);
 563                         urb->transfer_flags = URB_ISO_ASAP
 564                                         | URB_NO_TRANSFER_DMA_MAP;
 565                         urb->interval = ep->desc.bInterval;
 566                         urb->complete = isoc_irq;
 567                         urb->number_of_packets = npkt;
 568                         for (i = 0; i < npkt; i++) {
 569                                 urb->iso_frame_desc[i].length = psize;
 570                                 urb->iso_frame_desc[i].offset = psize * i;
 571                         }
 572                 } else {                /* bulk */
 573                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 574                                                 ep->desc.bEndpointAddress),
 575                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 576                         urb->complete = bulk_irq;
 577                 }
 578         }
 579         return 0;
 580 }
 581
 582 /*
 583  * start the USB transfer
 584  */
 585 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 586 {
 587         struct usb_host_endpoint *ep;
 588         int n, ret;
 589
 590         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 591                 return -ERESTARTSYS;
 592
 593         if (!gspca_dev->present) {
 594                 ret = -ENODEV;
 595                 goto out;
 596         }
 597
 598         /* set the higher alternate setting and
 599          * loop until urb submit succeeds */
 600         if (gspca_dev->cam.reverse_alts)
 601                 gspca_dev->alt = 0;
 602         else
 603                 gspca_dev->alt = gspca_dev->nbalt;
 604
 605         if (gspca_dev->sd_desc->isoc_init) {
 606                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 607                 if (ret < 0)
 608                         goto out;
 609         }
 610         ep = get_ep(gspca_dev);
 611         if (ep == NULL) {
 612                 ret = -EIO;
 613                 goto out;
 614         }
 615         for (;;) {
 616                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 617                 ret = create_urbs(gspca_dev, ep);
 618                 if (ret < 0)
 619                         goto out;
 620
 621                 /* clear the bulk endpoint */
 622                 if (gspca_dev->cam.bulk)
 623                         usb_clear_halt(gspca_dev->dev,
 624                                         gspca_dev->urb[0]->pipe);
 625
 626                 /* start the cam */
 627                 ret = gspca_dev->sd_desc->start(gspca_dev);
 628                 if (ret < 0) {
 629                         destroy_urbs(gspca_dev);
 630                         goto out;
 631                 }
 632                 gspca_dev->streaming = 1;
 633
 634                 /* some bulk transfers are started by the subdriver */
 635                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 636                         break;
 637
 638                 /* submit the URBs */
 639                 for (n = 0; n < gspca_dev->nurbs; n++) {
 640                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 641                         if (ret < 0)
 642                                 break;
 643                 }
 644                 if (ret >= 0)
 645                         break;
 646                 gspca_dev->streaming = 0;
 647                 destroy_urbs(gspca_dev);
 648                 if (ret != -ENOSPC) {
 649                         PDEBUG(D_ERR|D_STREAM,
 650                                 "usb_submit_urb alt %d err %d",
 651                                 gspca_dev->alt, ret);
 652                         goto out;
 653                 }
 654
 655                 /* the bandwidth is not wide enough
 656                  * negociate or try a lower alternate setting */
 657                 PDEBUG(D_ERR|D_STREAM,
 658                         "bandwidth not wide enough - trying again");
 659                 msleep(20);     /* wait for kill complete */
 660                 if (gspca_dev->sd_desc->isoc_nego) {
 661                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 662                         if (ret < 0)
 663                                 goto out;
 664                 } else {
 665                         ep = get_ep(gspca_dev);
 666                         if (ep == NULL) {
 667                                 ret = -EIO;
 668                                 goto out;
 669                         }
 670                 }
 671         }
 672 out:
 673         mutex_unlock(&gspca_dev->usb_lock);
 674         return ret;
 675 }
 676
 677 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 678 {
 679         int ret;
 680
 681         if (gspca_dev->alt == 0)
 682                 return 0;
 683         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 684         if (ret < 0)
 685                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 686         return ret;
 687 }
 688
 689 /* Note: both the queue and the usb locks should be held when calling this */
 690 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 691 {
 692         gspca_dev->streaming = 0;
 693         if (gspca_dev->present) {
 694                 if (gspca_dev->sd_desc->stopN)
 695                         gspca_dev->sd_desc->stopN(gspca_dev);
 696                 destroy_urbs(gspca_dev);
 697                 gspca_set_alt0(gspca_dev);
 698         }
 699
 700         /* always call stop0 to free the subdriver's resources */
 701         if (gspca_dev->sd_desc->stop0)
 702                 gspca_dev->sd_desc->stop0(gspca_dev);
 703         PDEBUG(D_STREAM, "stream off OK");
 704 }
 705
 706 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 707 {
 708         int i;
 709
 710         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 711         gspca_dev->curr_mode = i;
 712         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 713         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 714         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 715 }
 716
 717 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 718                         int width, int height)
 719 {
 720         int i;
 721
 722         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 723                 if (width >= gspca_dev->cam.cam_mode[i].width
 724                     && height >= gspca_dev->cam.cam_mode[i].height)
 725                         break;
 726         }
 727         return i;
 728 }
 729
 730 /*
 731  * search a mode with the right pixel format
 732  */
 733 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 734                         int mode,
 735                         int pixfmt)
 736 {
 737         int modeU, modeD;
 738
 739         modeU = modeD = mode;
 740         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 741                 if (--modeD >= 0) {
 742                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 743                                                                 == pixfmt)
 744                                 return modeD;
 745                 }
 746                 if (++modeU < gspca_dev->cam.nmodes) {
 747                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 748                                                                 == pixfmt)
 749                                 return modeU;
 750                 }
 751         }
 752         return -EINVAL;
 753 }
 754
 755 #ifdef CONFIG_VIDEO_ADV_DEBUG
 756 static int vidioc_g_register(struct file *file, void *priv,
 757                         struct v4l2_dbg_register *reg)
 758 {
 759         int ret;
 760         struct gspca_dev *gspca_dev = priv;
 761
 762         if (!gspca_dev->sd_desc->get_chip_ident)
 763                 return -EINVAL;
 764
 765         if (!gspca_dev->sd_desc->get_register)
 766                 return -EINVAL;
 767
 768         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 769                 return -ERESTARTSYS;
 770         if (gspca_dev->present)
 771                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 772         else
 773                 ret = -ENODEV;
 774         mutex_unlock(&gspca_dev->usb_lock);
 775
 776         return ret;
 777 }
 778
 779 static int vidioc_s_register(struct file *file, void *priv,
 780                         struct v4l2_dbg_register *reg)
 781 {
 782         int ret;
 783         struct gspca_dev *gspca_dev = priv;
 784
 785         if (!gspca_dev->sd_desc->get_chip_ident)
 786                 return -EINVAL;
 787
 788         if (!gspca_dev->sd_desc->set_register)
 789                 return -EINVAL;
 790
 791         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 792                 return -ERESTARTSYS;
 793         if (gspca_dev->present)
 794                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 795         else
 796                 ret = -ENODEV;
 797         mutex_unlock(&gspca_dev->usb_lock);
 798
 799         return ret;
 800 }
 801 #endif
 802
 803 static int vidioc_g_chip_ident(struct file *file, void *priv,
 804                         struct v4l2_dbg_chip_ident *chip)
 805 {
 806         int ret;
 807         struct gspca_dev *gspca_dev = priv;
 808
 809         if (!gspca_dev->sd_desc->get_chip_ident)
 810                 return -EINVAL;
 811
 812         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 813                 return -ERESTARTSYS;
 814         if (gspca_dev->present)
 815                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 816         else
 817                 ret = -ENODEV;
 818         mutex_unlock(&gspca_dev->usb_lock);
 819
 820         return ret;
 821 }
 822
 823 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 824                                 struct v4l2_fmtdesc *fmtdesc)
 825 {
 826         struct gspca_dev *gspca_dev = priv;
 827         int i, j, index;
 828         __u32 fmt_tb[8];
 829
 830         /* give an index to each format */
 831         index = 0;
 832         j = 0;
 833         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 834                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 835                 j = 0;
 836                 for (;;) {
 837                         if (fmt_tb[j] == fmt_tb[index])
 838                                 break;
 839                         j++;
 840                 }
 841                 if (j == index) {
 842                         if (fmtdesc->index == index)
 843                                 break;          /* new format */
 844                         index++;
 845                         if (index >= ARRAY_SIZE(fmt_tb))
 846                                 return -EINVAL;
 847                 }
 848         }
 849         if (i < 0)
 850                 return -EINVAL;         /* no more format */
 851
 852         fmtdesc->pixelformat = fmt_tb[index];
 853         if (gspca_is_compressed(fmt_tb[index]))
 854                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 855         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 856         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 857         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 858         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 859         fmtdesc->description[4] = '\0';
 860         return 0;
 861 }
 862
 863 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 864                             struct v4l2_format *fmt)
 865 {
 866         struct gspca_dev *gspca_dev = priv;
 867         int mode;
 868
 869         mode = gspca_dev->curr_mode;
 870         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 871                 sizeof fmt->fmt.pix);
 872         return 0;
 873 }
 874
 875 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 876                         struct v4l2_format *fmt)
 877 {
 878         int w, h, mode, mode2;
 879
 880         w = fmt->fmt.pix.width;
 881         h = fmt->fmt.pix.height;
 882
 883 #ifdef GSPCA_DEBUG
 884         if (gspca_debug & D_CONF)
 885                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 886 #endif
 887         /* search the closest mode for width and height */
 888         mode = wxh_to_mode(gspca_dev, w, h);
 889
 890         /* OK if right palette */
 891         if (gspca_dev->cam.cam_mode[mode].pixelformat
 892                                                 != fmt->fmt.pix.pixelformat) {
 893
 894                 /* else, search the closest mode with the same pixel format */
 895                 mode2 = gspca_get_mode(gspca_dev, mode,
 896                                         fmt->fmt.pix.pixelformat);
 897                 if (mode2 >= 0)
 898                         mode = mode2;
 899 /*              else
 900                         ;                * no chance, return this mode */
 901         }
 902         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 903                 sizeof fmt->fmt.pix);
 904         return mode;                    /* used when s_fmt */
 905 }
 906
 907 static int vidioc_try_fmt_vid_cap(struct file *file,
 908                               void *priv,
 909                               struct v4l2_format *fmt)
 910 {
 911         struct gspca_dev *gspca_dev = priv;
 912         int ret;
 913
 914         ret = try_fmt_vid_cap(gspca_dev, fmt);
 915         if (ret < 0)
 916                 return ret;
 917         return 0;
 918 }
 919
 920 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 921                             struct v4l2_format *fmt)
 922 {
 923         struct gspca_dev *gspca_dev = priv;
 924         int ret;
 925
 926         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 927                 return -ERESTARTSYS;
 928
 929         ret = try_fmt_vid_cap(gspca_dev, fmt);
 930         if (ret < 0)
 931                 goto out;
 932
 933         if (gspca_dev->nframes != 0
 934             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 935                 ret = -EINVAL;
 936                 goto out;
 937         }
 938
 939         if (ret == gspca_dev->curr_mode) {
 940                 ret = 0;
 941                 goto out;                       /* same mode */
 942         }
 943
 944         if (gspca_dev->streaming) {
 945                 ret = -EBUSY;
 946                 goto out;
 947         }
 948         gspca_dev->width = fmt->fmt.pix.width;
 949         gspca_dev->height = fmt->fmt.pix.height;
 950         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 951         gspca_dev->curr_mode = ret;
 952
 953         ret = 0;
 954 out:
 955         mutex_unlock(&gspca_dev->queue_lock);
 956         return ret;
 957 }
 958
 959 static int vidioc_enum_framesizes(struct file *file, void *priv,
 960                                   struct v4l2_frmsizeenum *fsize)
 961 {
 962         struct gspca_dev *gspca_dev = priv;
 963         int i;
 964         __u32 index = 0;
 965
 966         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 967                 if (fsize->pixel_format !=
 968                                 gspca_dev->cam.cam_mode[i].pixelformat)
 969                         continue;
 970
 971                 if (fsize->index == index) {
 972                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 973                         fsize->discrete.width =
 974                                 gspca_dev->cam.cam_mode[i].width;
 975                         fsize->discrete.height =
 976                                 gspca_dev->cam.cam_mode[i].height;
 977                         return 0;
 978                 }
 979                 index++;
 980         }
 981
 982         return -EINVAL;
 983 }
 984
 985 static void gspca_release(struct video_device *vfd)
 986 {
 987         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 988
 989         PDEBUG(D_PROBE, "%s released",
 990                 video_device_node_name(&gspca_dev->vdev));
 991
 992         kfree(gspca_dev->usb_buf);
 993         kfree(gspca_dev);
 994 }
 995
 996 static int dev_open(struct file *file)
 997 {
 998         struct gspca_dev *gspca_dev;
 999         int ret;
1000
1001         PDEBUG(D_STREAM, "[%s] open", current->comm);
1002         gspca_dev = (struct gspca_dev *) video_devdata(file);
1003         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1004                 return -ERESTARTSYS;
1005         if (!gspca_dev->present) {
1006                 ret = -ENODEV;
1007                 goto out;
1008         }
1009
1010         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1011                 ret = -EBUSY;
1012                 goto out;
1013         }
1014
1015         /* protect the subdriver against rmmod */
1016         if (!try_module_get(gspca_dev->module)) {
1017                 ret = -ENODEV;
1018                 goto out;
1019         }
1020
1021         gspca_dev->users++;
1022
1023         file->private_data = gspca_dev;
1024 #ifdef GSPCA_DEBUG
1025         /* activate the v4l2 debug */
1026         if (gspca_debug & D_V4L2)
1027                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1028                                         | V4L2_DEBUG_IOCTL_ARG;
1029         else
1030                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1031                                         | V4L2_DEBUG_IOCTL_ARG);
1032 #endif
1033         ret = 0;
1034 out:
1035         mutex_unlock(&gspca_dev->queue_lock);
1036         if (ret != 0)
1037                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1038         else
1039                 PDEBUG(D_STREAM, "open done");
1040         return ret;
1041 }
1042
1043 static int dev_close(struct file *file)
1044 {
1045         struct gspca_dev *gspca_dev = file->private_data;
1046
1047         PDEBUG(D_STREAM, "[%s] close", current->comm);
1048         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1049                 return -ERESTARTSYS;
1050         gspca_dev->users--;
1051
1052         /* if the file did the capture, free the streaming resources */
1053         if (gspca_dev->capt_file == file) {
1054                 if (gspca_dev->streaming) {
1055                         mutex_lock(&gspca_dev->usb_lock);
1056                         gspca_stream_off(gspca_dev);
1057                         mutex_unlock(&gspca_dev->usb_lock);
1058                 }
1059                 frame_free(gspca_dev);
1060                 gspca_dev->capt_file = NULL;
1061                 gspca_dev->memory = GSPCA_MEMORY_NO;
1062         }
1063         file->private_data = NULL;
1064         module_put(gspca_dev->module);
1065         mutex_unlock(&gspca_dev->queue_lock);
1066
1067         PDEBUG(D_STREAM, "close done");
1068
1069         return 0;
1070 }
1071
1072 static int vidioc_querycap(struct file *file, void  *priv,
1073                            struct v4l2_capability *cap)
1074 {
1075         struct gspca_dev *gspca_dev = priv;
1076         int ret;
1077
1078         /* protect the access to the usb device */
1079         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1080                 return -ERESTARTSYS;
1081         if (!gspca_dev->present) {
1082                 ret = -ENODEV;
1083                 goto out;
1084         }
1085         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1086         if (gspca_dev->dev->product != NULL) {
1087                 strncpy(cap->card, gspca_dev->dev->product,
1088                         sizeof cap->card);
1089         } else {
1090                 snprintf(cap->card, sizeof cap->card,
1091                         "USB Camera (%04x:%04x)",
1092                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1093                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1094         }
1095         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1096         cap->version = DRIVER_VERSION_NUMBER;
1097         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1098                           | V4L2_CAP_STREAMING
1099                           | V4L2_CAP_READWRITE;
1100         ret = 0;
1101 out:
1102         mutex_unlock(&gspca_dev->usb_lock);
1103         return ret;
1104 }
1105
1106 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1107                                    int id)
1108 {
1109         const struct ctrl *ctrls;
1110         int i;
1111
1112         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1113              i < gspca_dev->sd_desc->nctrls;
1114              i++, ctrls++) {
1115                 if (gspca_dev->ctrl_dis & (1 << i))
1116                         continue;
1117                 if (id == ctrls->qctrl.id)
1118                         return ctrls;
1119         }
1120         return NULL;
1121 }
1122
1123 static int vidioc_queryctrl(struct file *file, void *priv,
1124                            struct v4l2_queryctrl *q_ctrl)
1125 {
1126         struct gspca_dev *gspca_dev = priv;
1127         const struct ctrl *ctrls;
1128         int i;
1129         u32 id;
1130
1131         ctrls = NULL;
1132         id = q_ctrl->id;
1133         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1134                 id &= V4L2_CTRL_ID_MASK;
1135                 id++;
1136                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1137                         if (gspca_dev->ctrl_dis & (1 << i))
1138                                 continue;
1139                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1140                                 continue;
1141                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1142                                             > ctrls->qctrl.id)
1143                                 continue;
1144                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1145                 }
1146         } else {
1147                 ctrls = get_ctrl(gspca_dev, id);
1148                 i = ctrls - gspca_dev->sd_desc->ctrls;
1149         }
1150         if (ctrls == NULL)
1151                 return -EINVAL;
1152         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1153         if (gspca_dev->ctrl_inac & (1 << i))
1154                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1155         return 0;
1156 }
1157
1158 static int vidioc_s_ctrl(struct file *file, void *priv,
1159                          struct v4l2_control *ctrl)
1160 {
1161         struct gspca_dev *gspca_dev = priv;
1162         const struct ctrl *ctrls;
1163         int ret;
1164
1165         ctrls = get_ctrl(gspca_dev, ctrl->id);
1166         if (ctrls == NULL)
1167                 return -EINVAL;
1168
1169         if (ctrl->value < ctrls->qctrl.minimum
1170             || ctrl->value > ctrls->qctrl.maximum)
1171                 return -ERANGE;
1172         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1173         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1174                 return -ERESTARTSYS;
1175         if (gspca_dev->present)
1176                 ret = ctrls->set(gspca_dev, ctrl->value);
1177         else
1178                 ret = -ENODEV;
1179         mutex_unlock(&gspca_dev->usb_lock);
1180         return ret;
1181 }
1182
1183 static int vidioc_g_ctrl(struct file *file, void *priv,
1184                          struct v4l2_control *ctrl)
1185 {
1186         struct gspca_dev *gspca_dev = priv;
1187         const struct ctrl *ctrls;
1188         int ret;
1189
1190         ctrls = get_ctrl(gspca_dev, ctrl->id);
1191         if (ctrls == NULL)
1192                 return -EINVAL;
1193
1194         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1195                 return -ERESTARTSYS;
1196         if (gspca_dev->present)
1197                 ret = ctrls->get(gspca_dev, &ctrl->value);
1198         else
1199                 ret = -ENODEV;
1200         mutex_unlock(&gspca_dev->usb_lock);
1201         return ret;
1202 }
1203
1204 /*fixme: have an audio flag in gspca_dev?*/
1205 static int vidioc_s_audio(struct file *file, void *priv,
1206                          struct v4l2_audio *audio)
1207 {
1208         if (audio->index != 0)
1209                 return -EINVAL;
1210         return 0;
1211 }
1212
1213 static int vidioc_g_audio(struct file *file, void *priv,
1214                          struct v4l2_audio *audio)
1215 {
1216         strcpy(audio->name, "Microphone");
1217         return 0;
1218 }
1219
1220 static int vidioc_enumaudio(struct file *file, void *priv,
1221                          struct v4l2_audio *audio)
1222 {
1223         if (audio->index != 0)
1224                 return -EINVAL;
1225
1226         strcpy(audio->name, "Microphone");
1227         audio->capability = 0;
1228         audio->mode = 0;
1229         return 0;
1230 }
1231
1232 static int vidioc_querymenu(struct file *file, void *priv,
1233                             struct v4l2_querymenu *qmenu)
1234 {
1235         struct gspca_dev *gspca_dev = priv;
1236
1237         if (!gspca_dev->sd_desc->querymenu)
1238                 return -EINVAL;
1239         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1240 }
1241
1242 static int vidioc_enum_input(struct file *file, void *priv,
1243                                 struct v4l2_input *input)
1244 {
1245         struct gspca_dev *gspca_dev = priv;
1246
1247         if (input->index != 0)
1248                 return -EINVAL;
1249         input->type = V4L2_INPUT_TYPE_CAMERA;
1250         input->status = gspca_dev->cam.input_flags;
1251         strncpy(input->name, gspca_dev->sd_desc->name,
1252                 sizeof input->name);
1253         return 0;
1254 }
1255
1256 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1257 {
1258         *i = 0;
1259         return 0;
1260 }
1261
1262 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1263 {
1264         if (i > 0)
1265                 return -EINVAL;
1266         return (0);
1267 }
1268
1269 static int vidioc_reqbufs(struct file *file, void *priv,
1270                           struct v4l2_requestbuffers *rb)
1271 {
1272         struct gspca_dev *gspca_dev = priv;
1273         int i, ret = 0;
1274
1275         switch (rb->memory) {
1276         case GSPCA_MEMORY_READ:                 /* (internal call) */
1277         case V4L2_MEMORY_MMAP:
1278         case V4L2_MEMORY_USERPTR:
1279                 break;
1280         default:
1281                 return -EINVAL;
1282         }
1283         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1284                 return -ERESTARTSYS;
1285
1286         if (gspca_dev->memory != GSPCA_MEMORY_NO
1287             && gspca_dev->memory != rb->memory) {
1288                 ret = -EBUSY;
1289                 goto out;
1290         }
1291
1292         /* only one file may do the capture */
1293         if (gspca_dev->capt_file != NULL
1294             && gspca_dev->capt_file != file) {
1295                 ret = -EBUSY;
1296                 goto out;
1297         }
1298
1299         /* if allocated, the buffers must not be mapped */
1300         for (i = 0; i < gspca_dev->nframes; i++) {
1301                 if (gspca_dev->frame[i].vma_use_count) {
1302                         ret = -EBUSY;
1303                         goto out;
1304                 }
1305         }
1306
1307         /* stop streaming */
1308         if (gspca_dev->streaming) {
1309                 mutex_lock(&gspca_dev->usb_lock);
1310                 gspca_stream_off(gspca_dev);
1311                 mutex_unlock(&gspca_dev->usb_lock);
1312         }
1313
1314         /* free the previous allocated buffers, if any */
1315         if (gspca_dev->nframes != 0) {
1316                 frame_free(gspca_dev);
1317                 gspca_dev->capt_file = NULL;
1318         }
1319         if (rb->count == 0)                     /* unrequest */
1320                 goto out;
1321         gspca_dev->memory = rb->memory;
1322         ret = frame_alloc(gspca_dev, rb->count);
1323         if (ret == 0) {
1324                 rb->count = gspca_dev->nframes;
1325                 gspca_dev->capt_file = file;
1326         }
1327 out:
1328         mutex_unlock(&gspca_dev->queue_lock);
1329         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1330         return ret;
1331 }
1332
1333 static int vidioc_querybuf(struct file *file, void *priv,
1334                            struct v4l2_buffer *v4l2_buf)
1335 {
1336         struct gspca_dev *gspca_dev = priv;
1337         struct gspca_frame *frame;
1338
1339         if (v4l2_buf->index < 0
1340             || v4l2_buf->index >= gspca_dev->nframes)
1341                 return -EINVAL;
1342
1343         frame = &gspca_dev->frame[v4l2_buf->index];
1344         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1345         return 0;
1346 }
1347
1348 static int vidioc_streamon(struct file *file, void *priv,
1349                            enum v4l2_buf_type buf_type)
1350 {
1351         struct gspca_dev *gspca_dev = priv;
1352         int ret;
1353
1354         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1355                 return -EINVAL;
1356         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1357                 return -ERESTARTSYS;
1358
1359         if (gspca_dev->nframes == 0
1360             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1361                 ret = -EINVAL;
1362                 goto out;
1363         }
1364         if (!gspca_dev->streaming) {
1365                 ret = gspca_init_transfer(gspca_dev);
1366                 if (ret < 0)
1367                         goto out;
1368         }
1369 #ifdef GSPCA_DEBUG
1370         if (gspca_debug & D_STREAM) {
1371                 PDEBUG_MODE("stream on OK",
1372                         gspca_dev->pixfmt,
1373                         gspca_dev->width,
1374                         gspca_dev->height);
1375         }
1376 #endif
1377         ret = 0;
1378 out:
1379         mutex_unlock(&gspca_dev->queue_lock);
1380         return ret;
1381 }
1382
1383 static int vidioc_streamoff(struct file *file, void *priv,
1384                                 enum v4l2_buf_type buf_type)
1385 {
1386         struct gspca_dev *gspca_dev = priv;
1387         int i, ret;
1388
1389         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1390                 return -EINVAL;
1391         if (!gspca_dev->streaming)
1392                 return 0;
1393         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1394                 return -ERESTARTSYS;
1395
1396         /* stop streaming */
1397         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1398                 ret = -ERESTARTSYS;
1399                 goto out;
1400         }
1401         gspca_stream_off(gspca_dev);
1402         mutex_unlock(&gspca_dev->usb_lock);
1403
1404         /* empty the application queues */
1405         for (i = 0; i < gspca_dev->nframes; i++)
1406                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1407         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1408         gspca_dev->last_packet_type = DISCARD_PACKET;
1409         gspca_dev->sequence = 0;
1410         ret = 0;
1411 out:
1412         mutex_unlock(&gspca_dev->queue_lock);
1413         return ret;
1414 }
1415
1416 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1417                         struct v4l2_jpegcompression *jpegcomp)
1418 {
1419         struct gspca_dev *gspca_dev = priv;
1420         int ret;
1421
1422         if (!gspca_dev->sd_desc->get_jcomp)
1423                 return -EINVAL;
1424         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1425                 return -ERESTARTSYS;
1426         if (gspca_dev->present)
1427                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1428         else
1429                 ret = -ENODEV;
1430         mutex_unlock(&gspca_dev->usb_lock);
1431         return ret;
1432 }
1433
1434 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1435                         struct v4l2_jpegcompression *jpegcomp)
1436 {
1437         struct gspca_dev *gspca_dev = priv;
1438         int ret;
1439
1440         if (!gspca_dev->sd_desc->set_jcomp)
1441                 return -EINVAL;
1442         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1443                 return -ERESTARTSYS;
1444         if (gspca_dev->present)
1445                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1446         else
1447                 ret = -ENODEV;
1448         mutex_unlock(&gspca_dev->usb_lock);
1449         return ret;
1450 }
1451
1452 static int vidioc_g_parm(struct file *filp, void *priv,
1453                         struct v4l2_streamparm *parm)
1454 {
1455         struct gspca_dev *gspca_dev = priv;
1456
1457         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1458
1459         if (gspca_dev->sd_desc->get_streamparm) {
1460                 int ret;
1461
1462                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1463                         return -ERESTARTSYS;
1464                 if (gspca_dev->present)
1465                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1466                                                                  parm);
1467                 else
1468                         ret = -ENODEV;
1469                 mutex_unlock(&gspca_dev->usb_lock);
1470                 return ret;
1471         }
1472
1473         return 0;
1474 }
1475
1476 static int vidioc_s_parm(struct file *filp, void *priv,
1477                         struct v4l2_streamparm *parm)
1478 {
1479         struct gspca_dev *gspca_dev = priv;
1480         int n;
1481
1482         n = parm->parm.capture.readbuffers;
1483         if (n == 0 || n > GSPCA_MAX_FRAMES)
1484                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1485         else
1486                 gspca_dev->nbufread = n;
1487
1488         if (gspca_dev->sd_desc->set_streamparm) {
1489                 int ret;
1490
1491                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1492                         return -ERESTARTSYS;
1493                 if (gspca_dev->present)
1494                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1495                                                                  parm);
1496                 else
1497                         ret = -ENODEV;
1498                 mutex_unlock(&gspca_dev->usb_lock);
1499                 return ret;
1500         }
1501
1502         return 0;
1503 }
1504
1505 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1506 static int vidiocgmbuf(struct file *file, void *priv,
1507                         struct video_mbuf *mbuf)
1508 {
1509         struct gspca_dev *gspca_dev = file->private_data;
1510         int i;
1511
1512         PDEBUG(D_STREAM, "cgmbuf");
1513         if (gspca_dev->nframes == 0) {
1514                 int ret;
1515
1516                 {
1517                         struct v4l2_format fmt;
1518
1519                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1520                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1521                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1522                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1523                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1524                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1525                         if (ret != 0)
1526                                 return ret;
1527                 }
1528                 {
1529                         struct v4l2_requestbuffers rb;
1530
1531                         memset(&rb, 0, sizeof rb);
1532                         rb.count = 4;
1533                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1534                         rb.memory = V4L2_MEMORY_MMAP;
1535                         ret = vidioc_reqbufs(file, priv, &rb);
1536                         if (ret != 0)
1537                                 return ret;
1538                 }
1539         }
1540         mbuf->frames = gspca_dev->nframes;
1541         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1542         for (i = 0; i < mbuf->frames; i++)
1543                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1544         return 0;
1545 }
1546 #endif
1547
1548 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1549 {
1550         struct gspca_dev *gspca_dev = file->private_data;
1551         struct gspca_frame *frame;
1552         struct page *page;
1553         unsigned long addr, start, size;
1554         int i, ret;
1555
1556         start = vma->vm_start;
1557         size = vma->vm_end - vma->vm_start;
1558         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1559
1560         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1561                 return -ERESTARTSYS;
1562         if (!gspca_dev->present) {
1563                 ret = -ENODEV;
1564                 goto out;
1565         }
1566         if (gspca_dev->capt_file != file) {
1567                 ret = -EINVAL;
1568                 goto out;
1569         }
1570
1571         frame = NULL;
1572         for (i = 0; i < gspca_dev->nframes; ++i) {
1573                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1574                         PDEBUG(D_STREAM, "mmap bad memory type");
1575                         break;
1576                 }
1577                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1578                                                 == vma->vm_pgoff) {
1579                         frame = &gspca_dev->frame[i];
1580                         break;
1581                 }
1582         }
1583         if (frame == NULL) {
1584                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1585                 ret = -EINVAL;
1586                 goto out;
1587         }
1588 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1589         /* v4l1 maps all the buffers */
1590         if (i != 0
1591             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1592 #endif
1593             if (size != frame->v4l2_buf.length) {
1594                 PDEBUG(D_STREAM, "mmap bad size");
1595                 ret = -EINVAL;
1596                 goto out;
1597         }
1598
1599         /*
1600          * - VM_IO marks the area as being a mmaped region for I/O to a
1601          *   device. It also prevents the region from being core dumped.
1602          */
1603         vma->vm_flags |= VM_IO;
1604
1605         addr = (unsigned long) frame->data;
1606         while (size > 0) {
1607                 page = vmalloc_to_page((void *) addr);
1608                 ret = vm_insert_page(vma, start, page);
1609                 if (ret < 0)
1610                         goto out;
1611                 start += PAGE_SIZE;
1612                 addr += PAGE_SIZE;
1613                 size -= PAGE_SIZE;
1614         }
1615
1616         vma->vm_ops = &gspca_vm_ops;
1617         vma->vm_private_data = frame;
1618         gspca_vm_open(vma);
1619         ret = 0;
1620 out:
1621         mutex_unlock(&gspca_dev->queue_lock);
1622         return ret;
1623 }
1624
1625 /*
1626  * wait for a video frame
1627  *
1628  * If a frame is ready, its index is returned.
1629  */
1630 static int frame_wait(struct gspca_dev *gspca_dev,
1631                         int nonblock_ing)
1632 {
1633         struct gspca_frame *frame;
1634         int i, j, ret;
1635
1636         /* check if a frame is ready */
1637         i = gspca_dev->fr_o;
1638         j = gspca_dev->fr_queue[i];
1639         frame = &gspca_dev->frame[j];
1640
1641         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1642                 if (nonblock_ing)
1643                         return -EAGAIN;
1644
1645                 /* wait till a frame is ready */
1646                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1647                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1648                         !gspca_dev->streaming || !gspca_dev->present,
1649                         msecs_to_jiffies(3000));
1650                 if (ret < 0)
1651                         return ret;
1652                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1653                         return -EIO;
1654         }
1655
1656         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1657         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1658                 gspca_dev->fr_q,
1659                 gspca_dev->fr_i,
1660                 gspca_dev->fr_o);
1661
1662         if (gspca_dev->sd_desc->dq_callback) {
1663                 mutex_lock(&gspca_dev->usb_lock);
1664                 if (gspca_dev->present)
1665                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1666                 mutex_unlock(&gspca_dev->usb_lock);
1667         }
1668         return j;
1669 }
1670
1671 /*
1672  * dequeue a video buffer
1673  *
1674  * If nonblock_ing is false, block until a buffer is available.
1675  */
1676 static int vidioc_dqbuf(struct file *file, void *priv,
1677                         struct v4l2_buffer *v4l2_buf)
1678 {
1679         struct gspca_dev *gspca_dev = priv;
1680         struct gspca_frame *frame;
1681         int i, ret;
1682
1683         PDEBUG(D_FRAM, "dqbuf");
1684         if (v4l2_buf->memory != gspca_dev->memory)
1685                 return -EINVAL;
1686
1687         if (!gspca_dev->present)
1688                 return -ENODEV;
1689
1690         /* if not streaming, be sure the application will not loop forever */
1691         if (!(file->f_flags & O_NONBLOCK)
1692             && !gspca_dev->streaming && gspca_dev->users == 1)
1693                 return -EINVAL;
1694
1695         /* only the capturing file may dequeue */
1696         if (gspca_dev->capt_file != file)
1697                 return -EINVAL;
1698
1699         /* only one dequeue / read at a time */
1700         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1701                 return -ERESTARTSYS;
1702
1703         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1704         if (ret < 0)
1705                 goto out;
1706         i = ret;                                /* frame index */
1707         frame = &gspca_dev->frame[i];
1708         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1709                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1710                                  frame->data,
1711                                  frame->v4l2_buf.bytesused)) {
1712                         PDEBUG(D_ERR|D_STREAM,
1713                                 "dqbuf cp to user failed");
1714                         ret = -EFAULT;
1715                         goto out;
1716                 }
1717         }
1718         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1719         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1720         PDEBUG(D_FRAM, "dqbuf %d", i);
1721         ret = 0;
1722 out:
1723         mutex_unlock(&gspca_dev->read_lock);
1724         return ret;
1725 }
1726
1727 /*
1728  * queue a video buffer
1729  *
1730  * Attempting to queue a buffer that has already been
1731  * queued will return -EINVAL.
1732  */
1733 static int vidioc_qbuf(struct file *file, void *priv,
1734                         struct v4l2_buffer *v4l2_buf)
1735 {
1736         struct gspca_dev *gspca_dev = priv;
1737         struct gspca_frame *frame;
1738         int i, index, ret;
1739
1740         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1741
1742         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1743                 return -ERESTARTSYS;
1744
1745         index = v4l2_buf->index;
1746         if ((unsigned) index >= gspca_dev->nframes) {
1747                 PDEBUG(D_FRAM,
1748                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1749                 ret = -EINVAL;
1750                 goto out;
1751         }
1752         if (v4l2_buf->memory != gspca_dev->memory) {
1753                 PDEBUG(D_FRAM, "qbuf bad memory type");
1754                 ret = -EINVAL;
1755                 goto out;
1756         }
1757
1758         frame = &gspca_dev->frame[index];
1759         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1760                 PDEBUG(D_FRAM, "qbuf bad state");
1761                 ret = -EINVAL;
1762                 goto out;
1763         }
1764
1765         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1766
1767         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1768                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1769                 frame->v4l2_buf.length = v4l2_buf->length;
1770         }
1771
1772         /* put the buffer in the 'queued' queue */
1773         i = gspca_dev->fr_q;
1774         gspca_dev->fr_queue[i] = index;
1775         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1776         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1777                 gspca_dev->fr_q,
1778                 gspca_dev->fr_i,
1779                 gspca_dev->fr_o);
1780
1781         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1782         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1783         ret = 0;
1784 out:
1785         mutex_unlock(&gspca_dev->queue_lock);
1786         return ret;
1787 }
1788
1789 /*
1790  * allocate the resources for read()
1791  */
1792 static int read_alloc(struct gspca_dev *gspca_dev,
1793                         struct file *file)
1794 {
1795         struct v4l2_buffer v4l2_buf;
1796         int i, ret;
1797
1798         PDEBUG(D_STREAM, "read alloc");
1799         if (gspca_dev->nframes == 0) {
1800                 struct v4l2_requestbuffers rb;
1801
1802                 memset(&rb, 0, sizeof rb);
1803                 rb.count = gspca_dev->nbufread;
1804                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1805                 rb.memory = GSPCA_MEMORY_READ;
1806                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1807                 if (ret != 0) {
1808                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1809                         return ret;
1810                 }
1811                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1812                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1813                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1814                 for (i = 0; i < gspca_dev->nbufread; i++) {
1815                         v4l2_buf.index = i;
1816                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1817                         if (ret != 0) {
1818                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1819                                 return ret;
1820                         }
1821                 }
1822                 gspca_dev->memory = GSPCA_MEMORY_READ;
1823         }
1824
1825         /* start streaming */
1826         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1827         if (ret != 0)
1828                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1829         return ret;
1830 }
1831
1832 static unsigned int dev_poll(struct file *file, poll_table *wait)
1833 {
1834         struct gspca_dev *gspca_dev = file->private_data;
1835         int i, ret;
1836
1837         PDEBUG(D_FRAM, "poll");
1838
1839         poll_wait(file, &gspca_dev->wq, wait);
1840
1841         /* if reqbufs is not done, the user would use read() */
1842         if (gspca_dev->nframes == 0) {
1843                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1844                         return POLLERR;         /* not the 1st time */
1845                 ret = read_alloc(gspca_dev, file);
1846                 if (ret != 0)
1847                         return POLLERR;
1848         }
1849
1850         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1851                 return POLLERR;
1852
1853         /* check the next incoming buffer */
1854         i = gspca_dev->fr_o;
1855         i = gspca_dev->fr_queue[i];
1856         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1857                 ret = POLLIN | POLLRDNORM;      /* something to read */
1858         else
1859                 ret = 0;
1860         mutex_unlock(&gspca_dev->queue_lock);
1861         if (!gspca_dev->present)
1862                 return POLLHUP;
1863         return ret;
1864 }
1865
1866 static ssize_t dev_read(struct file *file, char __user *data,
1867                     size_t count, loff_t *ppos)
1868 {
1869         struct gspca_dev *gspca_dev = file->private_data;
1870         struct gspca_frame *frame;
1871         struct v4l2_buffer v4l2_buf;
1872         struct timeval timestamp;
1873         int n, ret, ret2;
1874
1875         PDEBUG(D_FRAM, "read (%zd)", count);
1876         if (!gspca_dev->present)
1877                 return -ENODEV;
1878         switch (gspca_dev->memory) {
1879         case GSPCA_MEMORY_NO:                   /* first time */
1880                 ret = read_alloc(gspca_dev, file);
1881                 if (ret != 0)
1882                         return ret;
1883                 break;
1884         case GSPCA_MEMORY_READ:
1885                 if (gspca_dev->capt_file == file)
1886                         break;
1887                 /* fall thru */
1888         default:
1889                 return -EINVAL;
1890         }
1891
1892         /* get a frame */
1893         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1894         timestamp.tv_sec--;
1895         n = 2;
1896         for (;;) {
1897                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1898                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1899                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1900                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1901                 if (ret != 0) {
1902                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1903                         return ret;
1904                 }
1905
1906                 /* if the process slept for more than 1 second,
1907                  * get a newer frame */
1908                 frame = &gspca_dev->frame[v4l2_buf.index];
1909                 if (--n < 0)
1910                         break;                  /* avoid infinite loop */
1911                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1912                         break;
1913                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1914                 if (ret != 0) {
1915                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1916                         return ret;
1917                 }
1918         }
1919
1920         /* copy the frame */
1921         if (count > frame->v4l2_buf.bytesused)
1922                 count = frame->v4l2_buf.bytesused;
1923         ret = copy_to_user(data, frame->data, count);
1924         if (ret != 0) {
1925                 PDEBUG(D_ERR|D_STREAM,
1926                         "read cp to user lack %d / %zd", ret, count);
1927                 ret = -EFAULT;
1928                 goto out;
1929         }
1930         ret = count;
1931 out:
1932         /* in each case, requeue the buffer */
1933         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1934         if (ret2 != 0)
1935                 return ret2;
1936         return ret;
1937 }
1938
1939 static struct v4l2_file_operations dev_fops = {
1940         .owner = THIS_MODULE,
1941         .open = dev_open,
1942         .release = dev_close,
1943         .read = dev_read,
1944         .mmap = dev_mmap,
1945         .unlocked_ioctl = video_ioctl2,
1946         .poll   = dev_poll,
1947 };
1948
1949 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1950         .vidioc_querycap        = vidioc_querycap,
1951         .vidioc_dqbuf           = vidioc_dqbuf,
1952         .vidioc_qbuf            = vidioc_qbuf,
1953         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1954         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1955         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1956         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1957         .vidioc_streamon        = vidioc_streamon,
1958         .vidioc_queryctrl       = vidioc_queryctrl,
1959         .vidioc_g_ctrl          = vidioc_g_ctrl,
1960         .vidioc_s_ctrl          = vidioc_s_ctrl,
1961         .vidioc_g_audio         = vidioc_g_audio,
1962         .vidioc_s_audio         = vidioc_s_audio,
1963         .vidioc_enumaudio       = vidioc_enumaudio,
1964         .vidioc_querymenu       = vidioc_querymenu,
1965         .vidioc_enum_input      = vidioc_enum_input,
1966         .vidioc_g_input         = vidioc_g_input,
1967         .vidioc_s_input         = vidioc_s_input,
1968         .vidioc_reqbufs         = vidioc_reqbufs,
1969         .vidioc_querybuf        = vidioc_querybuf,
1970         .vidioc_streamoff       = vidioc_streamoff,
1971         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1972         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1973         .vidioc_g_parm          = vidioc_g_parm,
1974         .vidioc_s_parm          = vidioc_s_parm,
1975         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1976 #ifdef CONFIG_VIDEO_ADV_DEBUG
1977         .vidioc_g_register      = vidioc_g_register,
1978         .vidioc_s_register      = vidioc_s_register,
1979 #endif
1980         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1981 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1982         .vidiocgmbuf          = vidiocgmbuf,
1983 #endif
1984 };
1985
1986 static struct video_device gspca_template = {
1987         .name = "gspca main driver",
1988         .fops = &dev_fops,
1989         .ioctl_ops = &dev_ioctl_ops,
1990         .release = gspca_release,
1991 };
1992
1993 /*
1994  * probe and create a new gspca device
1995  *
1996  * This function must be called by the sub-driver when it is
1997  * called for probing a new device.
1998  */
1999 int gspca_dev_probe(struct usb_interface *intf,
2000                 const struct usb_device_id *id,
2001                 const struct sd_desc *sd_desc,
2002                 int dev_size,
2003                 struct module *module)
2004 {
2005         struct usb_interface_descriptor *interface;
2006         struct gspca_dev *gspca_dev;
2007         struct usb_device *dev = interface_to_usbdev(intf);
2008         int ret;
2009
2010         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2011
2012         /* we don't handle multi-config cameras */
2013         if (dev->descriptor.bNumConfigurations != 1) {
2014                 PDEBUG(D_ERR, "Too many config");
2015                 return -ENODEV;
2016         }
2017         interface = &intf->cur_altsetting->desc;
2018         if (interface->bInterfaceNumber > 0) {
2019                 PDEBUG(D_ERR, "intf != 0");
2020                 return -ENODEV;
2021         }
2022
2023         /* create the device */
2024         if (dev_size < sizeof *gspca_dev)
2025                 dev_size = sizeof *gspca_dev;
2026         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2027         if (!gspca_dev) {
2028                 err("couldn't kzalloc gspca struct");
2029                 return -ENOMEM;
2030         }
2031         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2032         if (!gspca_dev->usb_buf) {
2033                 err("out of memory");
2034                 ret = -ENOMEM;
2035                 goto out;
2036         }
2037         gspca_dev->dev = dev;
2038         gspca_dev->iface = interface->bInterfaceNumber;
2039         gspca_dev->nbalt = intf->num_altsetting;
2040         gspca_dev->sd_desc = sd_desc;
2041         gspca_dev->nbufread = 2;
2042         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2043
2044         /* configure the subdriver and initialize the USB device */
2045         ret = sd_desc->config(gspca_dev, id);
2046         if (ret < 0)
2047                 goto out;
2048         ret = sd_desc->init(gspca_dev);
2049         if (ret < 0)
2050                 goto out;
2051         gspca_set_default_mode(gspca_dev);
2052
2053         mutex_init(&gspca_dev->usb_lock);
2054         mutex_init(&gspca_dev->read_lock);
2055         mutex_init(&gspca_dev->queue_lock);
2056         init_waitqueue_head(&gspca_dev->wq);
2057
2058         /* init video stuff */
2059         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2060         gspca_dev->vdev.parent = &intf->dev;
2061         gspca_dev->module = module;
2062         gspca_dev->present = 1;
2063         ret = video_register_device(&gspca_dev->vdev,
2064                                   VFL_TYPE_GRABBER,
2065                                   -1);
2066         if (ret < 0) {
2067                 err("video_register_device err %d", ret);
2068                 goto out;
2069         }
2070
2071         usb_set_intfdata(intf, gspca_dev);
2072         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2073         return 0;
2074 out:
2075         kfree(gspca_dev->usb_buf);
2076         kfree(gspca_dev);
2077         return ret;
2078 }
2079 EXPORT_SYMBOL(gspca_dev_probe);
2080
2081 /*
2082  * USB disconnection
2083  *
2084  * This function must be called by the sub-driver
2085  * when the device disconnects, after the specific resources are freed.
2086  */
2087 void gspca_disconnect(struct usb_interface *intf)
2088 {
2089         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2090
2091         PDEBUG(D_PROBE, "%s disconnect",
2092                 video_device_node_name(&gspca_dev->vdev));
2093         mutex_lock(&gspca_dev->usb_lock);
2094         gspca_dev->present = 0;
2095
2096         if (gspca_dev->streaming) {
2097                 destroy_urbs(gspca_dev);
2098                 wake_up_interruptible(&gspca_dev->wq);
2099         }
2100
2101         /* the device is freed at exit of this function */
2102         gspca_dev->dev = NULL;
2103         mutex_unlock(&gspca_dev->usb_lock);
2104
2105         usb_set_intfdata(intf, NULL);
2106
2107         /* release the device */
2108         /* (this will call gspca_release() immediatly or on last close) */
2109         video_unregister_device(&gspca_dev->vdev);
2110
2111 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2112 }
2113 EXPORT_SYMBOL(gspca_disconnect);
2114
2115 #ifdef CONFIG_PM
2116 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2117 {
2118         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2119
2120         if (!gspca_dev->streaming)
2121                 return 0;
2122         gspca_dev->frozen = 1;          /* avoid urb error messages */
2123         if (gspca_dev->sd_desc->stopN)
2124                 gspca_dev->sd_desc->stopN(gspca_dev);
2125         destroy_urbs(gspca_dev);
2126         gspca_set_alt0(gspca_dev);
2127         if (gspca_dev->sd_desc->stop0)
2128                 gspca_dev->sd_desc->stop0(gspca_dev);
2129         return 0;
2130 }
2131 EXPORT_SYMBOL(gspca_suspend);
2132
2133 int gspca_resume(struct usb_interface *intf)
2134 {
2135         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2136
2137         gspca_dev->frozen = 0;
2138         gspca_dev->sd_desc->init(gspca_dev);
2139         if (gspca_dev->streaming)
2140                 return gspca_init_transfer(gspca_dev);
2141         return 0;
2142 }
2143 EXPORT_SYMBOL(gspca_resume);
2144 #endif
2145 /* -- cam driver utility functions -- */
2146
2147 /* auto gain and exposure algorithm based on the knee algorithm described here:
2148    http://ytse.tricolour.net/docs/LowLightOptimization.html
2149
2150    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2151    where changed. */
2152 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2153         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2154 {
2155         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2156         const struct ctrl *gain_ctrl = NULL;
2157         const struct ctrl *exposure_ctrl = NULL;
2158         const struct ctrl *autogain_ctrl = NULL;
2159         int retval = 0;
2160
2161         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2162                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2163                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2164                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2165                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2166                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2167                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2168         }
2169         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2170                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2171                         "on cam without (auto)gain/exposure");
2172                 return 0;
2173         }
2174
2175         if (gain_ctrl->get(gspca_dev, &gain) ||
2176                         exposure_ctrl->get(gspca_dev, &exposure) ||
2177                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2178                 return 0;
2179
2180         orig_gain = gain;
2181         orig_exposure = exposure;
2182
2183         /* If we are of a multiple of deadzone, do multiple steps to reach the
2184            desired lumination fast (with the risc of a slight overshoot) */
2185         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2186
2187         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2188                 avg_lum, desired_avg_lum, steps);
2189
2190         for (i = 0; i < steps; i++) {
2191                 if (avg_lum > desired_avg_lum) {
2192                         if (gain > gain_knee)
2193                                 gain--;
2194                         else if (exposure > exposure_knee)
2195                                 exposure--;
2196                         else if (gain > gain_ctrl->qctrl.default_value)
2197                                 gain--;
2198                         else if (exposure > exposure_ctrl->qctrl.minimum)
2199                                 exposure--;
2200                         else if (gain > gain_ctrl->qctrl.minimum)
2201                                 gain--;
2202                         else
2203                                 break;
2204                 } else {
2205                         if (gain < gain_ctrl->qctrl.default_value)
2206                                 gain++;
2207                         else if (exposure < exposure_knee)
2208                                 exposure++;
2209                         else if (gain < gain_knee)
2210                                 gain++;
2211                         else if (exposure < exposure_ctrl->qctrl.maximum)
2212                                 exposure++;
2213                         else if (gain < gain_ctrl->qctrl.maximum)
2214                                 gain++;
2215                         else
2216                                 break;
2217                 }
2218         }
2219
2220         if (gain != orig_gain) {
2221                 gain_ctrl->set(gspca_dev, gain);
2222                 retval = 1;
2223         }
2224         if (exposure != orig_exposure) {
2225                 exposure_ctrl->set(gspca_dev, exposure);
2226                 retval = 1;
2227         }
2228
2229         return retval;
2230 }
2231 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2232
2233 /* -- module insert / remove -- */
2234 static int __init gspca_init(void)
2235 {
2236         info("main v%d.%d.%d registered",
2237                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2238                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2239                 DRIVER_VERSION_NUMBER & 0xff);
2240         return 0;
2241 }
2242 static void __exit gspca_exit(void)
2243 {
2244         info("main deregistered");
2245 }
2246
2247 module_init(gspca_init);
2248 module_exit(gspca_exit);
2249
2250 #ifdef GSPCA_DEBUG
2251 module_param_named(debug, gspca_debug, int, 0644);
2252 MODULE_PARM_DESC(debug,
2253                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2254                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2255                 " 0x0100: v4l2");
2256 #endif