drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * V4L2 by 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 <linux/kref.h>
  34 #include <asm/page.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/jiffies.h>
  37 #include <media/v4l2-ioctl.h>
  38
  39 #include "gspca.h"
  40
  41 /* global values */
  42 #define DEF_NURBS 2             /* default number of URBs */
  43
  44 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  45 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  46 MODULE_LICENSE("GPL");
  47
  48 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 3, 0)
  49
  50 static int video_nr = -1;
  51
  52 #ifdef GSPCA_DEBUG
  53 int gspca_debug = D_ERR | D_PROBE;
  54 EXPORT_SYMBOL(gspca_debug);
  55
  56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  57 {
  58         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  59                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  60                         txt,
  61                         pixfmt & 0xff,
  62                         (pixfmt >> 8) & 0xff,
  63                         (pixfmt >> 16) & 0xff,
  64                         pixfmt >> 24,
  65                         w, h);
  66         } else {
  67                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  68                         txt,
  69                         pixfmt,
  70                         w, h);
  71         }
  72 }
  73 #else
  74 #define PDEBUG_MODE(txt, pixfmt, w, h)
  75 #endif
  76
  77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  78 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  79 #define GSPCA_MEMORY_READ 7
  80
  81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  82
  83 /*
  84  * VMA operations.
  85  */
  86 static void gspca_vm_open(struct vm_area_struct *vma)
  87 {
  88         struct gspca_frame *frame = vma->vm_private_data;
  89
  90         frame->vma_use_count++;
  91         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  92 }
  93
  94 static void gspca_vm_close(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         if (--frame->vma_use_count <= 0)
  99                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static struct vm_operations_struct gspca_vm_ops = {
 103         .open           = gspca_vm_open,
 104         .close          = gspca_vm_close,
 105 };
 106
 107 /* get the current input frame buffer */
 108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 109 {
 110         struct gspca_frame *frame;
 111         int i;
 112
 113         i = gspca_dev->fr_i;
 114         i = gspca_dev->fr_queue[i];
 115         frame = &gspca_dev->frame[i];
 116         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 117                                 != V4L2_BUF_FLAG_QUEUED)
 118                 return NULL;
 119         return frame;
 120 }
 121 EXPORT_SYMBOL(gspca_get_i_frame);
 122
 123 /*
 124  * fill a video frame from an URB and resubmit
 125  */
 126 static void fill_frame(struct gspca_dev *gspca_dev,
 127                         struct urb *urb)
 128 {
 129         struct gspca_frame *frame;
 130         __u8 *data;             /* address of data in the iso message */
 131         int i, len, st;
 132         cam_pkt_op pkt_scan;
 133
 134         if (urb->status != 0) {
 135 #ifdef CONFIG_PM
 136                 if (!gspca_dev->frozen)
 137 #endif
 138                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 139                 return;         /* disconnection ? */
 140         }
 141         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 142         for (i = 0; i < urb->number_of_packets; i++) {
 143
 144                 /* check the availability of the frame buffer */
 145                 frame = gspca_get_i_frame(gspca_dev);
 146                 if (!frame) {
 147                         gspca_dev->last_packet_type = DISCARD_PACKET;
 148                         break;
 149                 }
 150
 151                 /* check the packet status and length */
 152                 len = urb->iso_frame_desc[i].actual_length;
 153                 if (len == 0)
 154                         continue;
 155                 st = urb->iso_frame_desc[i].status;
 156                 if (st) {
 157                         PDEBUG(D_ERR,
 158                                 "ISOC data error: [%d] len=%d, status=%d",
 159                                 i, len, st);
 160                         gspca_dev->last_packet_type = DISCARD_PACKET;
 161                         continue;
 162                 }
 163
 164                 /* let the packet be analyzed by the subdriver */
 165                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 166                         i, urb->iso_frame_desc[i].offset, len);
 167                 data = (__u8 *) urb->transfer_buffer
 168                                         + urb->iso_frame_desc[i].offset;
 169                 pkt_scan(gspca_dev, frame, data, len);
 170         }
 171
 172         /* resubmit the URB */
 173         urb->status = 0;
 174         st = usb_submit_urb(urb, GFP_ATOMIC);
 175         if (st < 0)
 176                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 177 }
 178
 179 /*
 180  * ISOC message interrupt from the USB device
 181  *
 182  * Analyse each packet and call the subdriver for copy to the frame buffer.
 183  */
 184 static void isoc_irq(struct urb *urb
 185 )
 186 {
 187         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 188
 189         PDEBUG(D_PACK, "isoc irq");
 190         if (!gspca_dev->streaming)
 191                 return;
 192         fill_frame(gspca_dev, urb);
 193 }
 194
 195 /*
 196  * bulk message interrupt from the USB device
 197  */
 198 static void bulk_irq(struct urb *urb
 199 )
 200 {
 201         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 202         struct gspca_frame *frame;
 203
 204         PDEBUG(D_PACK, "bulk irq");
 205         if (!gspca_dev->streaming)
 206                 return;
 207         if (urb->status != 0 && urb->status != -ECONNRESET) {
 208 #ifdef CONFIG_PM
 209                 if (!gspca_dev->frozen)
 210 #endif
 211                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 212                 return;         /* disconnection ? */
 213         }
 214
 215         /* check the availability of the frame buffer */
 216         frame = gspca_get_i_frame(gspca_dev);
 217         if (!frame) {
 218                 gspca_dev->last_packet_type = DISCARD_PACKET;
 219         } else {
 220                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 221                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 222                                         frame,
 223                                         urb->transfer_buffer,
 224                                         urb->actual_length);
 225         }
 226 }
 227
 228 /*
 229  * add data to the current frame
 230  *
 231  * This function is called by the subdrivers at interrupt level.
 232  *
 233  * To build a frame, these ones must add
 234  *      - one FIRST_PACKET
 235  *      - 0 or many INTER_PACKETs
 236  *      - one LAST_PACKET
 237  * DISCARD_PACKET invalidates the whole frame.
 238  * On LAST_PACKET, a new frame is returned.
 239  */
 240 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 241                                     enum gspca_packet_type packet_type,
 242                                     struct gspca_frame *frame,
 243                                     const __u8 *data,
 244                                     int len)
 245 {
 246         int i, j;
 247
 248         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 249
 250         /* when start of a new frame, if the current frame buffer
 251          * is not queued, discard the whole frame */
 252         if (packet_type == FIRST_PACKET) {
 253                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 254                                                 != V4L2_BUF_FLAG_QUEUED) {
 255                         gspca_dev->last_packet_type = DISCARD_PACKET;
 256                         return frame;
 257                 }
 258                 frame->data_end = frame->data;
 259                 jiffies_to_timeval(get_jiffies_64(),
 260                                    &frame->v4l2_buf.timestamp);
 261                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 262         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 263                 if (packet_type == LAST_PACKET)
 264                         gspca_dev->last_packet_type = packet_type;
 265                 return frame;
 266         }
 267
 268         /* append the packet to the frame buffer */
 269         if (len > 0) {
 270                 if (frame->data_end - frame->data + len
 271                                                  > frame->v4l2_buf.length) {
 272                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 273                                 frame->data_end - frame->data + len,
 274                                 frame->v4l2_buf.length);
 275                         packet_type = DISCARD_PACKET;
 276                 } else {
 277                         memcpy(frame->data_end, data, len);
 278                         frame->data_end += len;
 279                 }
 280         }
 281         gspca_dev->last_packet_type = packet_type;
 282
 283         /* if last packet, wake up the application and advance in the queue */
 284         if (packet_type == LAST_PACKET) {
 285                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 286                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 287                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 288                 atomic_inc(&gspca_dev->nevent);
 289                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 290                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 291                 gspca_dev->fr_i = i;
 292                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 293                         frame->v4l2_buf.bytesused,
 294                         gspca_dev->fr_q,
 295                         i,
 296                         gspca_dev->fr_o);
 297                 j = gspca_dev->fr_queue[i];
 298                 frame = &gspca_dev->frame[j];
 299         }
 300         return frame;
 301 }
 302 EXPORT_SYMBOL(gspca_frame_add);
 303
 304 static int gspca_is_compressed(__u32 format)
 305 {
 306         switch (format) {
 307         case V4L2_PIX_FMT_MJPEG:
 308         case V4L2_PIX_FMT_JPEG:
 309         case V4L2_PIX_FMT_SPCA561:
 310         case V4L2_PIX_FMT_PAC207:
 311                 return 1;
 312         }
 313         return 0;
 314 }
 315
 316 static void *rvmalloc(unsigned long size)
 317 {
 318         void *mem;
 319         unsigned long adr;
 320
 321         mem = vmalloc_32(size);
 322         if (mem != NULL) {
 323                 adr = (unsigned long) mem;
 324                 while ((long) size > 0) {
 325                         SetPageReserved(vmalloc_to_page((void *) adr));
 326                         adr += PAGE_SIZE;
 327                         size -= PAGE_SIZE;
 328                 }
 329         }
 330         return mem;
 331 }
 332
 333 static void rvfree(void *mem, long size)
 334 {
 335         unsigned long adr;
 336
 337         adr = (unsigned long) mem;
 338         while (size > 0) {
 339                 ClearPageReserved(vmalloc_to_page((void *) adr));
 340                 adr += PAGE_SIZE;
 341                 size -= PAGE_SIZE;
 342         }
 343         vfree(mem);
 344 }
 345
 346 static int frame_alloc(struct gspca_dev *gspca_dev,
 347                         unsigned int count)
 348 {
 349         struct gspca_frame *frame;
 350         unsigned int frsz;
 351         int i;
 352
 353         i = gspca_dev->curr_mode;
 354         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 355         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 356         frsz = PAGE_ALIGN(frsz);
 357         gspca_dev->frsz = frsz;
 358         if (count > GSPCA_MAX_FRAMES)
 359                 count = GSPCA_MAX_FRAMES;
 360         gspca_dev->frbuf = rvmalloc(frsz * count);
 361         if (!gspca_dev->frbuf) {
 362                 err("frame alloc failed");
 363                 return -ENOMEM;
 364         }
 365         gspca_dev->nframes = count;
 366         for (i = 0; i < count; i++) {
 367                 frame = &gspca_dev->frame[i];
 368                 frame->v4l2_buf.index = i;
 369                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 370                 frame->v4l2_buf.flags = 0;
 371                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 372                 frame->v4l2_buf.length = frsz;
 373                 frame->v4l2_buf.memory = gspca_dev->memory;
 374                 frame->v4l2_buf.sequence = 0;
 375                 frame->data = frame->data_end =
 376                                         gspca_dev->frbuf + i * frsz;
 377                 frame->v4l2_buf.m.offset = i * frsz;
 378         }
 379         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 380         gspca_dev->last_packet_type = DISCARD_PACKET;
 381         gspca_dev->sequence = 0;
 382         atomic_set(&gspca_dev->nevent, 0);
 383         return 0;
 384 }
 385
 386 static void frame_free(struct gspca_dev *gspca_dev)
 387 {
 388         int i;
 389
 390         PDEBUG(D_STREAM, "frame free");
 391         if (gspca_dev->frbuf != NULL) {
 392                 rvfree(gspca_dev->frbuf,
 393                         gspca_dev->nframes * gspca_dev->frsz);
 394                 gspca_dev->frbuf = NULL;
 395                 for (i = 0; i < gspca_dev->nframes; i++)
 396                         gspca_dev->frame[i].data = NULL;
 397         }
 398         gspca_dev->nframes = 0;
 399 }
 400
 401 static void destroy_urbs(struct gspca_dev *gspca_dev)
 402 {
 403         struct urb *urb;
 404         unsigned int i;
 405
 406         PDEBUG(D_STREAM, "kill transfer");
 407         for (i = 0; i < MAX_NURBS; i++) {
 408                 urb = gspca_dev->urb[i];
 409                 if (urb == NULL)
 410                         break;
 411
 412                 gspca_dev->urb[i] = NULL;
 413                 usb_kill_urb(urb);
 414                 if (urb->transfer_buffer != NULL)
 415                         usb_buffer_free(gspca_dev->dev,
 416                                         urb->transfer_buffer_length,
 417                                         urb->transfer_buffer,
 418                                         urb->transfer_dma);
 419                 usb_free_urb(urb);
 420         }
 421 }
 422
 423 /*
 424  * look for an input transfer endpoint in an alternate setting
 425  */
 426 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 427                                           __u8 epaddr,
 428                                           __u8 xfer)
 429 {
 430         struct usb_host_endpoint *ep;
 431         int i, attr;
 432
 433         epaddr |= USB_DIR_IN;
 434         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 435                 ep = &alt->endpoint[i];
 436                 if (ep->desc.bEndpointAddress == epaddr) {
 437                         attr = ep->desc.bmAttributes
 438                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 439                         if (attr == xfer)
 440                                 return ep;
 441                         break;
 442                 }
 443         }
 444         return NULL;
 445 }
 446
 447 /*
 448  * look for an input (isoc or bulk) endpoint
 449  *
 450  * The endpoint is defined by the subdriver.
 451  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 452  * This routine may be called many times when the bandwidth is too small
 453  * (the bandwidth is checked on urb submit).
 454  */
 455 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 456 {
 457         struct usb_interface *intf;
 458         struct usb_host_endpoint *ep;
 459         int i, ret;
 460
 461         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 462         ep = NULL;
 463         i = gspca_dev->alt;                     /* previous alt setting */
 464
 465         /* try isoc */
 466         while (--i > 0) {                       /* alt 0 is unusable */
 467                 ep = alt_xfer(&intf->altsetting[i],
 468                                 gspca_dev->cam.epaddr,
 469                                 USB_ENDPOINT_XFER_ISOC);
 470                 if (ep)
 471                         break;
 472         }
 473
 474         /* if no isoc, try bulk */
 475         if (ep == NULL) {
 476                 ep = alt_xfer(&intf->altsetting[0],
 477                                 gspca_dev->cam.epaddr,
 478                                 USB_ENDPOINT_XFER_BULK);
 479                 if (ep == NULL) {
 480                         err("no transfer endpoint found");
 481                         return NULL;
 482                 }
 483         }
 484         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 485                         i, ep->desc.bEndpointAddress);
 486         if (i > 0) {
 487                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 488                 if (ret < 0) {
 489                         err("set interface err %d", ret);
 490                         return NULL;
 491                 }
 492         }
 493         gspca_dev->alt = i;             /* memorize the current alt setting */
 494         return ep;
 495 }
 496
 497 /*
 498  * create the URBs for image transfer
 499  */
 500 static int create_urbs(struct gspca_dev *gspca_dev,
 501                         struct usb_host_endpoint *ep)
 502 {
 503         struct urb *urb;
 504         int n, nurbs, i, psize, npkt, bsize;
 505
 506         /* calculate the packet size and the number of packets */
 507         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 508
 509         if (gspca_dev->alt != 0) {              /* isoc */
 510
 511                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 512                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 513                 npkt = ISO_MAX_SIZE / psize;
 514                 if (npkt > ISO_MAX_PKT)
 515                         npkt = ISO_MAX_PKT;
 516                 bsize = psize * npkt;
 517                 PDEBUG(D_STREAM,
 518                         "isoc %d pkts size %d = bsize:%d",
 519                         npkt, psize, bsize);
 520                 nurbs = DEF_NURBS;
 521         } else {                                /* bulk */
 522                 npkt = 0;
 523                 bsize = gspca_dev->cam. bulk_size;
 524                 if (bsize == 0)
 525                         bsize = psize;
 526                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 527                 nurbs = 1;
 528         }
 529
 530         gspca_dev->nurbs = nurbs;
 531         for (n = 0; n < nurbs; n++) {
 532                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 533                 if (!urb) {
 534                         err("usb_alloc_urb failed");
 535                         destroy_urbs(gspca_dev);
 536                         return -ENOMEM;
 537                 }
 538                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 539                                                 bsize,
 540                                                 GFP_KERNEL,
 541                                                 &urb->transfer_dma);
 542
 543                 if (urb->transfer_buffer == NULL) {
 544                         usb_free_urb(urb);
 545                         err("usb_buffer_urb failed");
 546                         destroy_urbs(gspca_dev);
 547                         return -ENOMEM;
 548                 }
 549                 gspca_dev->urb[n] = urb;
 550                 urb->dev = gspca_dev->dev;
 551                 urb->context = gspca_dev;
 552                 urb->transfer_buffer_length = bsize;
 553                 if (npkt != 0) {                /* ISOC */
 554                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 555                                                     ep->desc.bEndpointAddress);
 556                         urb->transfer_flags = URB_ISO_ASAP
 557                                         | URB_NO_TRANSFER_DMA_MAP;
 558                         urb->interval = ep->desc.bInterval;
 559                         urb->complete = isoc_irq;
 560                         urb->number_of_packets = npkt;
 561                         for (i = 0; i < npkt; i++) {
 562                                 urb->iso_frame_desc[i].length = psize;
 563                                 urb->iso_frame_desc[i].offset = psize * i;
 564                         }
 565                 } else {                /* bulk */
 566                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 567                                                 ep->desc.bEndpointAddress),
 568                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 569                         urb->complete = bulk_irq;
 570                 }
 571         }
 572         return 0;
 573 }
 574
 575 /*
 576  * start the USB transfer
 577  */
 578 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 579 {
 580         struct usb_host_endpoint *ep;
 581         int n, ret;
 582
 583         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 584                 return -ERESTARTSYS;
 585
 586         /* set the higher alternate setting and
 587          * loop until urb submit succeeds */
 588         gspca_dev->alt = gspca_dev->nbalt;
 589         for (;;) {
 590                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 591                 ep = get_ep(gspca_dev);
 592                 if (ep == NULL) {
 593                         ret = -EIO;
 594                         goto out;
 595                 }
 596                 ret = create_urbs(gspca_dev, ep);
 597                 if (ret < 0)
 598                         goto out;
 599
 600                 /* start the cam */
 601                 ret = gspca_dev->sd_desc->start(gspca_dev);
 602                 if (ret < 0) {
 603                         destroy_urbs(gspca_dev);
 604                         goto out;
 605                 }
 606                 gspca_dev->streaming = 1;
 607                 atomic_set(&gspca_dev->nevent, 0);
 608
 609                 /* bulk transfers are started by the subdriver */
 610                 if (gspca_dev->alt == 0)
 611                         break;
 612
 613                 /* submit the URBs */
 614                 for (n = 0; n < gspca_dev->nurbs; n++) {
 615                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 616                         if (ret < 0) {
 617                                 PDEBUG(D_ERR|D_STREAM,
 618                                         "usb_submit_urb [%d] err %d", n, ret);
 619                                 gspca_dev->streaming = 0;
 620                                 destroy_urbs(gspca_dev);
 621                                 if (ret == -ENOSPC)
 622                                         break;  /* try the previous alt */
 623                                 goto out;
 624                         }
 625                 }
 626                 if (ret >= 0)
 627                         break;
 628         }
 629 out:
 630         mutex_unlock(&gspca_dev->usb_lock);
 631         return ret;
 632 }
 633
 634 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 635 {
 636         int ret;
 637
 638         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 639         if (ret < 0)
 640                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 641         return ret;
 642 }
 643
 644 /* Note: both the queue and the usb locks should be held when calling this */
 645 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 646 {
 647         gspca_dev->streaming = 0;
 648         atomic_set(&gspca_dev->nevent, 0);
 649         if (gspca_dev->present) {
 650                 if (gspca_dev->sd_desc->stopN)
 651                         gspca_dev->sd_desc->stopN(gspca_dev);
 652                 destroy_urbs(gspca_dev);
 653                 gspca_set_alt0(gspca_dev);
 654                 if (gspca_dev->sd_desc->stop0)
 655                         gspca_dev->sd_desc->stop0(gspca_dev);
 656                 PDEBUG(D_STREAM, "stream off OK");
 657         }
 658 }
 659
 660 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 661 {
 662         int i;
 663
 664         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 665         gspca_dev->curr_mode = i;
 666         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 667         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 668         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 669 }
 670
 671 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 672                         int width, int height)
 673 {
 674         int i;
 675
 676         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 677                 if (width >= gspca_dev->cam.cam_mode[i].width
 678                     && height >= gspca_dev->cam.cam_mode[i].height)
 679                         break;
 680         }
 681         return i;
 682 }
 683
 684 /*
 685  * search a mode with the right pixel format
 686  */
 687 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 688                         int mode,
 689                         int pixfmt)
 690 {
 691         int modeU, modeD;
 692
 693         modeU = modeD = mode;
 694         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 695                 if (--modeD >= 0) {
 696                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 697                                                                 == pixfmt)
 698                                 return modeD;
 699                 }
 700                 if (++modeU < gspca_dev->cam.nmodes) {
 701                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 702                                                                 == pixfmt)
 703                                 return modeU;
 704                 }
 705         }
 706         return -EINVAL;
 707 }
 708
 709 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 710                                 struct v4l2_fmtdesc *fmtdesc)
 711 {
 712         struct gspca_dev *gspca_dev = priv;
 713         int i, j, index;
 714         __u32 fmt_tb[8];
 715
 716         /* give an index to each format */
 717         index = 0;
 718         j = 0;
 719         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 720                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 721                 j = 0;
 722                 for (;;) {
 723                         if (fmt_tb[j] == fmt_tb[index])
 724                                 break;
 725                         j++;
 726                 }
 727                 if (j == index) {
 728                         if (fmtdesc->index == index)
 729                                 break;          /* new format */
 730                         index++;
 731                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 732                                 return -EINVAL;
 733                 }
 734         }
 735         if (i < 0)
 736                 return -EINVAL;         /* no more format */
 737
 738         fmtdesc->pixelformat = fmt_tb[index];
 739         if (gspca_is_compressed(fmt_tb[index]))
 740                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 741         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 742         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 743         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 744         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 745         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 746         fmtdesc->description[4] = '\0';
 747         return 0;
 748 }
 749
 750 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 751                             struct v4l2_format *fmt)
 752 {
 753         struct gspca_dev *gspca_dev = priv;
 754         int mode;
 755
 756         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 757                 return -EINVAL;
 758         mode = gspca_dev->curr_mode;
 759         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 760                 sizeof fmt->fmt.pix);
 761         return 0;
 762 }
 763
 764 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 765                         struct v4l2_format *fmt)
 766 {
 767         int w, h, mode, mode2;
 768
 769         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 770                 return -EINVAL;
 771         w = fmt->fmt.pix.width;
 772         h = fmt->fmt.pix.height;
 773
 774 #ifdef GSPCA_DEBUG
 775         if (gspca_debug & D_CONF)
 776                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 777 #endif
 778         /* search the closest mode for width and height */
 779         mode = wxh_to_mode(gspca_dev, w, h);
 780
 781         /* OK if right palette */
 782         if (gspca_dev->cam.cam_mode[mode].pixelformat
 783                                                 != fmt->fmt.pix.pixelformat) {
 784
 785                 /* else, search the closest mode with the same pixel format */
 786                 mode2 = gspca_get_mode(gspca_dev, mode,
 787                                         fmt->fmt.pix.pixelformat);
 788                 if (mode2 >= 0)
 789                         mode = mode2;
 790 /*              else
 791                         ;                * no chance, return this mode */
 792         }
 793         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 794                 sizeof fmt->fmt.pix);
 795         return mode;                    /* used when s_fmt */
 796 }
 797
 798 static int vidioc_try_fmt_vid_cap(struct file *file,
 799                               void *priv,
 800                               struct v4l2_format *fmt)
 801 {
 802         struct gspca_dev *gspca_dev = priv;
 803         int ret;
 804
 805         ret = try_fmt_vid_cap(gspca_dev, fmt);
 806         if (ret < 0)
 807                 return ret;
 808         return 0;
 809 }
 810
 811 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 812                             struct v4l2_format *fmt)
 813 {
 814         struct gspca_dev *gspca_dev = priv;
 815         int ret;
 816
 817         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 818                 return -ERESTARTSYS;
 819
 820         ret = try_fmt_vid_cap(gspca_dev, fmt);
 821         if (ret < 0)
 822                 goto out;
 823
 824         if (gspca_dev->nframes != 0
 825             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 826                 ret = -EINVAL;
 827                 goto out;
 828         }
 829
 830         if (ret == gspca_dev->curr_mode) {
 831                 ret = 0;
 832                 goto out;                       /* same mode */
 833         }
 834
 835         if (gspca_dev->streaming) {
 836                 ret = -EBUSY;
 837                 goto out;
 838         }
 839         gspca_dev->width = fmt->fmt.pix.width;
 840         gspca_dev->height = fmt->fmt.pix.height;
 841         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 842         gspca_dev->curr_mode = ret;
 843
 844         ret = 0;
 845 out:
 846         mutex_unlock(&gspca_dev->queue_lock);
 847         return ret;
 848 }
 849
 850 static void gspca_delete(struct kref *kref)
 851 {
 852         struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
 853
 854         PDEBUG(D_STREAM, "device deleted");
 855
 856         kfree(gspca_dev->usb_buf);
 857         kfree(gspca_dev);
 858 }
 859
 860 static int dev_open(struct inode *inode, struct file *file)
 861 {
 862         struct gspca_dev *gspca_dev;
 863         int ret;
 864
 865         PDEBUG(D_STREAM, "%s open", current->comm);
 866         gspca_dev = (struct gspca_dev *) video_devdata(file);
 867         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 868                 return -ERESTARTSYS;
 869         if (!gspca_dev->present) {
 870                 ret = -ENODEV;
 871                 goto out;
 872         }
 873
 874         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 875                 ret = -EBUSY;
 876                 goto out;
 877         }
 878         gspca_dev->users++;
 879
 880         /* one more user */
 881         kref_get(&gspca_dev->kref);
 882
 883         file->private_data = gspca_dev;
 884 #ifdef GSPCA_DEBUG
 885         /* activate the v4l2 debug */
 886         if (gspca_debug & D_V4L2)
 887                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 888                                         | V4L2_DEBUG_IOCTL_ARG;
 889         else
 890                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 891                                         | V4L2_DEBUG_IOCTL_ARG);
 892 #endif
 893         ret = 0;
 894 out:
 895         mutex_unlock(&gspca_dev->queue_lock);
 896         if (ret != 0)
 897                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 898         else
 899                 PDEBUG(D_STREAM, "open done");
 900         return ret;
 901 }
 902
 903 static int dev_close(struct inode *inode, struct file *file)
 904 {
 905         struct gspca_dev *gspca_dev = file->private_data;
 906
 907         PDEBUG(D_STREAM, "%s close", current->comm);
 908         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 909                 return -ERESTARTSYS;
 910         gspca_dev->users--;
 911
 912         /* if the file did the capture, free the streaming resources */
 913         if (gspca_dev->capt_file == file) {
 914                 if (gspca_dev->streaming) {
 915                         mutex_lock(&gspca_dev->usb_lock);
 916                         gspca_stream_off(gspca_dev);
 917                         mutex_unlock(&gspca_dev->usb_lock);
 918                 }
 919                 frame_free(gspca_dev);
 920                 gspca_dev->capt_file = NULL;
 921                 gspca_dev->memory = GSPCA_MEMORY_NO;
 922         }
 923         file->private_data = NULL;
 924         mutex_unlock(&gspca_dev->queue_lock);
 925
 926         PDEBUG(D_STREAM, "close done");
 927
 928         kref_put(&gspca_dev->kref, gspca_delete);
 929
 930         return 0;
 931 }
 932
 933 static int vidioc_querycap(struct file *file, void  *priv,
 934                            struct v4l2_capability *cap)
 935 {
 936         struct gspca_dev *gspca_dev = priv;
 937
 938         memset(cap, 0, sizeof *cap);
 939         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 940         if (gspca_dev->dev->product != NULL) {
 941                 strncpy(cap->card, gspca_dev->dev->product,
 942                         sizeof cap->card);
 943         } else {
 944                 snprintf(cap->card, sizeof cap->card,
 945                         "USB Camera (%04x:%04x)",
 946                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 947                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 948         }
 949         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 950                 sizeof cap->bus_info);
 951         cap->version = DRIVER_VERSION_NUMBER;
 952         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 953                           | V4L2_CAP_STREAMING
 954                           | V4L2_CAP_READWRITE;
 955         return 0;
 956 }
 957
 958 static int vidioc_queryctrl(struct file *file, void *priv,
 959                            struct v4l2_queryctrl *q_ctrl)
 960 {
 961         struct gspca_dev *gspca_dev = priv;
 962         int i, ix;
 963         u32 id;
 964
 965         ix = -1;
 966         id = q_ctrl->id;
 967         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 968                 id &= V4L2_CTRL_ID_MASK;
 969                 id++;
 970                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 971                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 972                                 continue;
 973                         if (ix < 0) {
 974                                 ix = i;
 975                                 continue;
 976                         }
 977                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 978                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 979                                 continue;
 980                         ix = i;
 981                 }
 982         }
 983         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 984                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 985                         ix = i;
 986                         break;
 987                 }
 988         }
 989         if (ix < 0)
 990                 return -EINVAL;
 991         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 992                 sizeof *q_ctrl);
 993         if (gspca_dev->ctrl_dis & (1 << ix))
 994                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 995         return 0;
 996 }
 997
 998 static int vidioc_s_ctrl(struct file *file, void *priv,
 999                          struct v4l2_control *ctrl)
1000 {
1001         struct gspca_dev *gspca_dev = priv;
1002         const struct ctrl *ctrls;
1003         int i, ret;
1004
1005         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1006              i < gspca_dev->sd_desc->nctrls;
1007              i++, ctrls++) {
1008                 if (ctrl->id != ctrls->qctrl.id)
1009                         continue;
1010                 if (gspca_dev->ctrl_dis & (1 << i))
1011                         return -EINVAL;
1012                 if (ctrl->value < ctrls->qctrl.minimum
1013                     || ctrl->value > ctrls->qctrl.maximum)
1014                         return -ERANGE;
1015                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1016                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1017                         return -ERESTARTSYS;
1018                 ret = ctrls->set(gspca_dev, ctrl->value);
1019                 mutex_unlock(&gspca_dev->usb_lock);
1020                 return ret;
1021         }
1022         return -EINVAL;
1023 }
1024
1025 static int vidioc_g_ctrl(struct file *file, void *priv,
1026                          struct v4l2_control *ctrl)
1027 {
1028         struct gspca_dev *gspca_dev = priv;
1029
1030         const struct ctrl *ctrls;
1031         int i, ret;
1032
1033         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1034              i < gspca_dev->sd_desc->nctrls;
1035              i++, ctrls++) {
1036                 if (ctrl->id != ctrls->qctrl.id)
1037                         continue;
1038                 if (gspca_dev->ctrl_dis & (1 << i))
1039                         return -EINVAL;
1040                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1041                         return -ERESTARTSYS;
1042                 ret = ctrls->get(gspca_dev, &ctrl->value);
1043                 mutex_unlock(&gspca_dev->usb_lock);
1044                 return ret;
1045         }
1046         return -EINVAL;
1047 }
1048
1049 static int vidioc_querymenu(struct file *file, void *priv,
1050                             struct v4l2_querymenu *qmenu)
1051 {
1052         struct gspca_dev *gspca_dev = priv;
1053
1054         if (!gspca_dev->sd_desc->querymenu)
1055                 return -EINVAL;
1056         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1057 }
1058
1059 static int vidioc_enum_input(struct file *file, void *priv,
1060                                 struct v4l2_input *input)
1061 {
1062         struct gspca_dev *gspca_dev = priv;
1063
1064         if (input->index != 0)
1065                 return -EINVAL;
1066         memset(input, 0, sizeof *input);
1067         input->type = V4L2_INPUT_TYPE_CAMERA;
1068         strncpy(input->name, gspca_dev->sd_desc->name,
1069                 sizeof input->name);
1070         return 0;
1071 }
1072
1073 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1074 {
1075         *i = 0;
1076         return 0;
1077 }
1078
1079 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1080 {
1081         if (i > 0)
1082                 return -EINVAL;
1083         return (0);
1084 }
1085
1086 static int vidioc_reqbufs(struct file *file, void *priv,
1087                           struct v4l2_requestbuffers *rb)
1088 {
1089         struct gspca_dev *gspca_dev = priv;
1090         int i, ret = 0;
1091
1092         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1093                 return -EINVAL;
1094         switch (rb->memory) {
1095         case GSPCA_MEMORY_READ:                 /* (internal call) */
1096         case V4L2_MEMORY_MMAP:
1097         case V4L2_MEMORY_USERPTR:
1098                 break;
1099         default:
1100                 return -EINVAL;
1101         }
1102         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1103                 return -ERESTARTSYS;
1104
1105         if (gspca_dev->memory != GSPCA_MEMORY_NO
1106             && gspca_dev->memory != rb->memory) {
1107                 ret = -EBUSY;
1108                 goto out;
1109         }
1110
1111         /* only one file may do the capture */
1112         if (gspca_dev->capt_file != NULL
1113             && gspca_dev->capt_file != file) {
1114                 ret = -EBUSY;
1115                 goto out;
1116         }
1117
1118         /* if allocated, the buffers must not be mapped */
1119         for (i = 0; i < gspca_dev->nframes; i++) {
1120                 if (gspca_dev->frame[i].vma_use_count) {
1121                         ret = -EBUSY;
1122                         goto out;
1123                 }
1124         }
1125
1126         /* stop streaming */
1127         if (gspca_dev->streaming) {
1128                 mutex_lock(&gspca_dev->usb_lock);
1129                 gspca_stream_off(gspca_dev);
1130                 mutex_unlock(&gspca_dev->usb_lock);
1131         }
1132
1133         /* free the previous allocated buffers, if any */
1134         if (gspca_dev->nframes != 0) {
1135                 frame_free(gspca_dev);
1136                 gspca_dev->capt_file = NULL;
1137         }
1138         if (rb->count == 0)                     /* unrequest */
1139                 goto out;
1140         gspca_dev->memory = rb->memory;
1141         ret = frame_alloc(gspca_dev, rb->count);
1142         if (ret == 0) {
1143                 rb->count = gspca_dev->nframes;
1144                 gspca_dev->capt_file = file;
1145         }
1146 out:
1147         mutex_unlock(&gspca_dev->queue_lock);
1148         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1149         return ret;
1150 }
1151
1152 static int vidioc_querybuf(struct file *file, void *priv,
1153                            struct v4l2_buffer *v4l2_buf)
1154 {
1155         struct gspca_dev *gspca_dev = priv;
1156         struct gspca_frame *frame;
1157
1158         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1159             || v4l2_buf->index < 0
1160             || v4l2_buf->index >= gspca_dev->nframes)
1161                 return -EINVAL;
1162
1163         frame = &gspca_dev->frame[v4l2_buf->index];
1164         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1165         return 0;
1166 }
1167
1168 static int vidioc_streamon(struct file *file, void *priv,
1169                            enum v4l2_buf_type buf_type)
1170 {
1171         struct gspca_dev *gspca_dev = priv;
1172         int ret;
1173
1174         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1175                 return -EINVAL;
1176         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1177                 return -ERESTARTSYS;
1178         if (!gspca_dev->present) {
1179                 ret = -ENODEV;
1180                 goto out;
1181         }
1182         if (gspca_dev->nframes == 0) {
1183                 ret = -EINVAL;
1184                 goto out;
1185         }
1186         if (!gspca_dev->streaming) {
1187                 ret = gspca_init_transfer(gspca_dev);
1188                 if (ret < 0)
1189                         goto out;
1190         }
1191 #ifdef GSPCA_DEBUG
1192         if (gspca_debug & D_STREAM) {
1193                 PDEBUG_MODE("stream on OK",
1194                         gspca_dev->pixfmt,
1195                         gspca_dev->width,
1196                         gspca_dev->height);
1197         }
1198 #endif
1199         ret = 0;
1200 out:
1201         mutex_unlock(&gspca_dev->queue_lock);
1202         return ret;
1203 }
1204
1205 static int vidioc_streamoff(struct file *file, void *priv,
1206                                 enum v4l2_buf_type buf_type)
1207 {
1208         struct gspca_dev *gspca_dev = priv;
1209         int i, ret;
1210
1211         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1212                 return -EINVAL;
1213         if (!gspca_dev->streaming)
1214                 return 0;
1215         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1216                 return -ERESTARTSYS;
1217
1218         /* stop streaming */
1219         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1220                 ret = -ERESTARTSYS;
1221                 goto out;
1222         }
1223         gspca_stream_off(gspca_dev);
1224         mutex_unlock(&gspca_dev->usb_lock);
1225
1226         /* empty the application queues */
1227         for (i = 0; i < gspca_dev->nframes; i++)
1228                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1229         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1230         gspca_dev->last_packet_type = DISCARD_PACKET;
1231         gspca_dev->sequence = 0;
1232         atomic_set(&gspca_dev->nevent, 0);
1233         ret = 0;
1234 out:
1235         mutex_unlock(&gspca_dev->queue_lock);
1236         return ret;
1237 }
1238
1239 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1240                         struct v4l2_jpegcompression *jpegcomp)
1241 {
1242         struct gspca_dev *gspca_dev = priv;
1243         int ret;
1244
1245         if (!gspca_dev->sd_desc->get_jcomp)
1246                 return -EINVAL;
1247         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1248                 return -ERESTARTSYS;
1249         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1250         mutex_unlock(&gspca_dev->usb_lock);
1251         return ret;
1252 }
1253
1254 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1255                         struct v4l2_jpegcompression *jpegcomp)
1256 {
1257         struct gspca_dev *gspca_dev = priv;
1258         int ret;
1259
1260         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1261                 return -ERESTARTSYS;
1262         if (!gspca_dev->sd_desc->set_jcomp)
1263                 return -EINVAL;
1264         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1265         mutex_unlock(&gspca_dev->usb_lock);
1266         return ret;
1267 }
1268
1269 static int vidioc_g_parm(struct file *filp, void *priv,
1270                         struct v4l2_streamparm *parm)
1271 {
1272         struct gspca_dev *gspca_dev = priv;
1273
1274         memset(parm, 0, sizeof *parm);
1275         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1276         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1277         return 0;
1278 }
1279
1280 static int vidioc_s_parm(struct file *filp, void *priv,
1281                         struct v4l2_streamparm *parm)
1282 {
1283         struct gspca_dev *gspca_dev = priv;
1284         int n;
1285
1286         n = parm->parm.capture.readbuffers;
1287         if (n == 0 || n > GSPCA_MAX_FRAMES)
1288                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1289         else
1290                 gspca_dev->nbufread = n;
1291         return 0;
1292 }
1293
1294 static int vidioc_s_std(struct file *filp, void *priv,
1295                         v4l2_std_id *parm)
1296 {
1297         return 0;
1298 }
1299
1300 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1301 static int vidiocgmbuf(struct file *file, void *priv,
1302                         struct video_mbuf *mbuf)
1303 {
1304         struct gspca_dev *gspca_dev = file->private_data;
1305         int i;
1306
1307         PDEBUG(D_STREAM, "cgmbuf");
1308         if (gspca_dev->nframes == 0) {
1309                 int ret;
1310
1311                 {
1312                         struct v4l2_format fmt;
1313
1314                         memset(&fmt, 0, sizeof fmt);
1315                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1316                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1317                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1318                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1319                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1320                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1321                         if (ret != 0)
1322                                 return ret;
1323                 }
1324                 {
1325                         struct v4l2_requestbuffers rb;
1326
1327                         memset(&rb, 0, sizeof rb);
1328                         rb.count = 4;
1329                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1330                         rb.memory = V4L2_MEMORY_MMAP;
1331                         ret = vidioc_reqbufs(file, priv, &rb);
1332                         if (ret != 0)
1333                                 return ret;
1334                 }
1335         }
1336         mbuf->frames = gspca_dev->nframes;
1337         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1338         for (i = 0; i < mbuf->frames; i++)
1339                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1340         return 0;
1341 }
1342 #endif
1343
1344 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1345 {
1346         struct gspca_dev *gspca_dev = file->private_data;
1347         struct gspca_frame *frame;
1348         struct page *page;
1349         unsigned long addr, start, size;
1350         int i, ret;
1351
1352         start = vma->vm_start;
1353         size = vma->vm_end - vma->vm_start;
1354         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1355
1356         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1357                 return -ERESTARTSYS;
1358         if (!gspca_dev->present) {
1359                 ret = -ENODEV;
1360                 goto out;
1361         }
1362         if (gspca_dev->capt_file != file) {
1363                 ret = -EINVAL;
1364                 goto out;
1365         }
1366
1367         frame = NULL;
1368         for (i = 0; i < gspca_dev->nframes; ++i) {
1369                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1370                         PDEBUG(D_STREAM, "mmap bad memory type");
1371                         break;
1372                 }
1373                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1374                                                 == vma->vm_pgoff) {
1375                         frame = &gspca_dev->frame[i];
1376                         break;
1377                 }
1378         }
1379         if (frame == NULL) {
1380                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1381                 ret = -EINVAL;
1382                 goto out;
1383         }
1384 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1385         /* v4l1 maps all the buffers */
1386         if (i != 0
1387             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1388 #endif
1389             if (size != frame->v4l2_buf.length) {
1390                 PDEBUG(D_STREAM, "mmap bad size");
1391                 ret = -EINVAL;
1392                 goto out;
1393         }
1394
1395         /*
1396          * - VM_IO marks the area as being a mmaped region for I/O to a
1397          *   device. It also prevents the region from being core dumped.
1398          */
1399         vma->vm_flags |= VM_IO;
1400
1401         addr = (unsigned long) frame->data;
1402         while (size > 0) {
1403                 page = vmalloc_to_page((void *) addr);
1404                 ret = vm_insert_page(vma, start, page);
1405                 if (ret < 0)
1406                         goto out;
1407                 start += PAGE_SIZE;
1408                 addr += PAGE_SIZE;
1409                 size -= PAGE_SIZE;
1410         }
1411
1412         vma->vm_ops = &gspca_vm_ops;
1413         vma->vm_private_data = frame;
1414         gspca_vm_open(vma);
1415         ret = 0;
1416 out:
1417         mutex_unlock(&gspca_dev->queue_lock);
1418         return ret;
1419 }
1420
1421 /*
1422  * wait for a video frame
1423  *
1424  * If a frame is ready, its index is returned.
1425  */
1426 static int frame_wait(struct gspca_dev *gspca_dev,
1427                         int nonblock_ing)
1428 {
1429         struct gspca_frame *frame;
1430         int i, j, ret;
1431
1432         /* check if a frame is ready */
1433         i = gspca_dev->fr_o;
1434         j = gspca_dev->fr_queue[i];
1435         frame = &gspca_dev->frame[j];
1436         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1437                 atomic_dec(&gspca_dev->nevent);
1438                 goto ok;
1439         }
1440         if (nonblock_ing)                       /* no frame yet */
1441                 return -EAGAIN;
1442
1443         /* wait till a frame is ready */
1444         for (;;) {
1445                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1446                                         atomic_read(&gspca_dev->nevent) > 0,
1447                                         msecs_to_jiffies(3000));
1448                 if (ret <= 0) {
1449                         if (ret < 0)
1450                                 return ret;     /* interrupt */
1451                         return -EIO;            /* timeout */
1452                 }
1453                 atomic_dec(&gspca_dev->nevent);
1454                 if (!gspca_dev->streaming || !gspca_dev->present)
1455                         return -EIO;
1456                 i = gspca_dev->fr_o;
1457                 j = gspca_dev->fr_queue[i];
1458                 frame = &gspca_dev->frame[j];
1459                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1460                         break;
1461         }
1462 ok:
1463         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1464         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1465                 gspca_dev->fr_q,
1466                 gspca_dev->fr_i,
1467                 gspca_dev->fr_o);
1468
1469         if (gspca_dev->sd_desc->dq_callback) {
1470                 mutex_lock(&gspca_dev->usb_lock);
1471                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1472                 mutex_unlock(&gspca_dev->usb_lock);
1473         }
1474         return j;
1475 }
1476
1477 /*
1478  * dequeue a video buffer
1479  *
1480  * If nonblock_ing is false, block until a buffer is available.
1481  */
1482 static int vidioc_dqbuf(struct file *file, void *priv,
1483                         struct v4l2_buffer *v4l2_buf)
1484 {
1485         struct gspca_dev *gspca_dev = priv;
1486         struct gspca_frame *frame;
1487         int i, ret;
1488
1489         PDEBUG(D_FRAM, "dqbuf");
1490         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1491                 return -EINVAL;
1492         if (v4l2_buf->memory != gspca_dev->memory)
1493                 return -EINVAL;
1494
1495         /* if not streaming, be sure the application will not loop forever */
1496         if (!(file->f_flags & O_NONBLOCK)
1497             && !gspca_dev->streaming && gspca_dev->users == 1)
1498                 return -EINVAL;
1499
1500         /* only the capturing file may dequeue */
1501         if (gspca_dev->capt_file != file)
1502                 return -EINVAL;
1503
1504         /* only one dequeue / read at a time */
1505         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1506                 return -ERESTARTSYS;
1507
1508         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1509         if (ret < 0)
1510                 goto out;
1511         i = ret;                                /* frame index */
1512         frame = &gspca_dev->frame[i];
1513         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1514                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1515                                  frame->data,
1516                                  frame->v4l2_buf.bytesused)) {
1517                         PDEBUG(D_ERR|D_STREAM,
1518                                 "dqbuf cp to user failed");
1519                         ret = -EFAULT;
1520                         goto out;
1521                 }
1522         }
1523         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1524         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1525         PDEBUG(D_FRAM, "dqbuf %d", i);
1526         ret = 0;
1527 out:
1528         mutex_unlock(&gspca_dev->read_lock);
1529         return ret;
1530 }
1531
1532 /*
1533  * queue a video buffer
1534  *
1535  * Attempting to queue a buffer that has already been
1536  * queued will return -EINVAL.
1537  */
1538 static int vidioc_qbuf(struct file *file, void *priv,
1539                         struct v4l2_buffer *v4l2_buf)
1540 {
1541         struct gspca_dev *gspca_dev = priv;
1542         struct gspca_frame *frame;
1543         int i, index, ret;
1544
1545         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1546         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1547                 return -EINVAL;
1548
1549         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1550                 return -ERESTARTSYS;
1551
1552         index = v4l2_buf->index;
1553         if ((unsigned) index >= gspca_dev->nframes) {
1554                 PDEBUG(D_FRAM,
1555                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1556                 ret = -EINVAL;
1557                 goto out;
1558         }
1559         if (v4l2_buf->memory != gspca_dev->memory) {
1560                 PDEBUG(D_FRAM, "qbuf bad memory type");
1561                 ret = -EINVAL;
1562                 goto out;
1563         }
1564
1565         frame = &gspca_dev->frame[index];
1566         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1567                 PDEBUG(D_FRAM, "qbuf bad state");
1568                 ret = -EINVAL;
1569                 goto out;
1570         }
1571
1572         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1573
1574         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1575                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1576                 frame->v4l2_buf.length = v4l2_buf->length;
1577         }
1578
1579         /* put the buffer in the 'queued' queue */
1580         i = gspca_dev->fr_q;
1581         gspca_dev->fr_queue[i] = index;
1582         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1583         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1584                 gspca_dev->fr_q,
1585                 gspca_dev->fr_i,
1586                 gspca_dev->fr_o);
1587
1588         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1589         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1590         ret = 0;
1591 out:
1592         mutex_unlock(&gspca_dev->queue_lock);
1593         return ret;
1594 }
1595
1596 /*
1597  * allocate the resources for read()
1598  */
1599 static int read_alloc(struct gspca_dev *gspca_dev,
1600                         struct file *file)
1601 {
1602         struct v4l2_buffer v4l2_buf;
1603         int i, ret;
1604
1605         PDEBUG(D_STREAM, "read alloc");
1606         if (gspca_dev->nframes == 0) {
1607                 struct v4l2_requestbuffers rb;
1608
1609                 memset(&rb, 0, sizeof rb);
1610                 rb.count = gspca_dev->nbufread;
1611                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1612                 rb.memory = GSPCA_MEMORY_READ;
1613                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1614                 if (ret != 0) {
1615                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1616                         return ret;
1617                 }
1618                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1619                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1620                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1621                 for (i = 0; i < gspca_dev->nbufread; i++) {
1622                         v4l2_buf.index = i;
1623                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1624                         if (ret != 0) {
1625                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1626                                 return ret;
1627                         }
1628                 }
1629                 gspca_dev->memory = GSPCA_MEMORY_READ;
1630         }
1631
1632         /* start streaming */
1633         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1634         if (ret != 0)
1635                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1636         return ret;
1637 }
1638
1639 static unsigned int dev_poll(struct file *file, poll_table *wait)
1640 {
1641         struct gspca_dev *gspca_dev = file->private_data;
1642         int i, ret;
1643
1644         PDEBUG(D_FRAM, "poll");
1645
1646         poll_wait(file, &gspca_dev->wq, wait);
1647         if (!gspca_dev->present)
1648                 return POLLERR;
1649
1650         /* if reqbufs is not done, the user would use read() */
1651         if (gspca_dev->nframes == 0) {
1652                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1653                         return POLLERR;         /* not the 1st time */
1654                 ret = read_alloc(gspca_dev, file);
1655                 if (ret != 0)
1656                         return POLLERR;
1657         }
1658
1659         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1660                 return POLLERR;
1661         if (!gspca_dev->present) {
1662                 ret = POLLERR;
1663                 goto out;
1664         }
1665
1666         /* check the next incoming buffer */
1667         i = gspca_dev->fr_o;
1668         i = gspca_dev->fr_queue[i];
1669         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1670                 ret = POLLIN | POLLRDNORM;      /* something to read */
1671         else
1672                 ret = 0;
1673 out:
1674         mutex_unlock(&gspca_dev->queue_lock);
1675         return ret;
1676 }
1677
1678 static ssize_t dev_read(struct file *file, char __user *data,
1679                     size_t count, loff_t *ppos)
1680 {
1681         struct gspca_dev *gspca_dev = file->private_data;
1682         struct gspca_frame *frame;
1683         struct v4l2_buffer v4l2_buf;
1684         struct timeval timestamp;
1685         int n, ret, ret2;
1686
1687         PDEBUG(D_FRAM, "read (%zd)", count);
1688         if (!gspca_dev->present)
1689                 return -ENODEV;
1690         switch (gspca_dev->memory) {
1691         case GSPCA_MEMORY_NO:                   /* first time */
1692                 ret = read_alloc(gspca_dev, file);
1693                 if (ret != 0)
1694                         return ret;
1695                 break;
1696         case GSPCA_MEMORY_READ:
1697                 if (gspca_dev->capt_file == file)
1698                         break;
1699                 /* fall thru */
1700         default:
1701                 return -EINVAL;
1702         }
1703
1704         /* get a frame */
1705         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1706         timestamp.tv_sec--;
1707         n = 2;
1708         for (;;) {
1709                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1710                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1711                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1712                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1713                 if (ret != 0) {
1714                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1715                         return ret;
1716                 }
1717
1718                 /* if the process slept for more than 1 second,
1719                  * get a newer frame */
1720                 frame = &gspca_dev->frame[v4l2_buf.index];
1721                 if (--n < 0)
1722                         break;                  /* avoid infinite loop */
1723                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1724                         break;
1725                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1726                 if (ret != 0) {
1727                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1728                         return ret;
1729                 }
1730         }
1731
1732         /* copy the frame */
1733         if (count > frame->v4l2_buf.bytesused)
1734                 count = frame->v4l2_buf.bytesused;
1735         ret = copy_to_user(data, frame->data, count);
1736         if (ret != 0) {
1737                 PDEBUG(D_ERR|D_STREAM,
1738                         "read cp to user lack %d / %zd", ret, count);
1739                 ret = -EFAULT;
1740                 goto out;
1741         }
1742         ret = count;
1743 out:
1744         /* in each case, requeue the buffer */
1745         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1746         if (ret2 != 0)
1747                 return ret2;
1748         return ret;
1749 }
1750
1751 static void dev_release(struct video_device *vfd)
1752 {
1753         /* nothing */
1754 }
1755
1756 static struct file_operations dev_fops = {
1757         .owner = THIS_MODULE,
1758         .open = dev_open,
1759         .release = dev_close,
1760         .read = dev_read,
1761         .mmap = dev_mmap,
1762         .ioctl = video_ioctl2,
1763 #ifdef CONFIG_COMPAT
1764         .compat_ioctl = v4l_compat_ioctl32,
1765 #endif
1766         .llseek = no_llseek,
1767         .poll   = dev_poll,
1768 };
1769
1770 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1771         .vidioc_querycap        = vidioc_querycap,
1772         .vidioc_dqbuf           = vidioc_dqbuf,
1773         .vidioc_qbuf            = vidioc_qbuf,
1774         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1775         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1776         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1777         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1778         .vidioc_streamon        = vidioc_streamon,
1779         .vidioc_queryctrl       = vidioc_queryctrl,
1780         .vidioc_g_ctrl          = vidioc_g_ctrl,
1781         .vidioc_s_ctrl          = vidioc_s_ctrl,
1782         .vidioc_querymenu       = vidioc_querymenu,
1783         .vidioc_enum_input      = vidioc_enum_input,
1784         .vidioc_g_input         = vidioc_g_input,
1785         .vidioc_s_input         = vidioc_s_input,
1786         .vidioc_reqbufs         = vidioc_reqbufs,
1787         .vidioc_querybuf        = vidioc_querybuf,
1788         .vidioc_streamoff       = vidioc_streamoff,
1789         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1790         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1791         .vidioc_g_parm          = vidioc_g_parm,
1792         .vidioc_s_parm          = vidioc_s_parm,
1793         .vidioc_s_std           = vidioc_s_std,
1794 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1795         .vidiocgmbuf          = vidiocgmbuf,
1796 #endif
1797 };
1798
1799 static struct video_device gspca_template = {
1800         .name = "gspca main driver",
1801         .fops = &dev_fops,
1802         .ioctl_ops = &dev_ioctl_ops,
1803         .release = dev_release,         /* mandatory */
1804         .minor = -1,
1805 };
1806
1807 /*
1808  * probe and create a new gspca device
1809  *
1810  * This function must be called by the sub-driver when it is
1811  * called for probing a new device.
1812  */
1813 int gspca_dev_probe(struct usb_interface *intf,
1814                 const struct usb_device_id *id,
1815                 const struct sd_desc *sd_desc,
1816                 int dev_size,
1817                 struct module *module)
1818 {
1819         struct usb_interface_descriptor *interface;
1820         struct gspca_dev *gspca_dev;
1821         struct usb_device *dev = interface_to_usbdev(intf);
1822         int ret;
1823
1824         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1825
1826         /* we don't handle multi-config cameras */
1827         if (dev->descriptor.bNumConfigurations != 1)
1828                 return -ENODEV;
1829         interface = &intf->cur_altsetting->desc;
1830         if (interface->bInterfaceNumber > 0)
1831                 return -ENODEV;
1832
1833         /* create the device */
1834         if (dev_size < sizeof *gspca_dev)
1835                 dev_size = sizeof *gspca_dev;
1836         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1837         if (!gspca_dev) {
1838                 err("couldn't kzalloc gspca struct");
1839                 return -ENOMEM;
1840         }
1841         kref_init(&gspca_dev->kref);
1842         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1843         if (!gspca_dev->usb_buf) {
1844                 err("out of memory");
1845                 ret = -ENOMEM;
1846                 goto out;
1847         }
1848         gspca_dev->dev = dev;
1849         gspca_dev->iface = interface->bInterfaceNumber;
1850         gspca_dev->nbalt = intf->num_altsetting;
1851         gspca_dev->sd_desc = sd_desc;
1852         gspca_dev->nbufread = 2;
1853
1854         /* configure the subdriver and initialize the USB device */
1855         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1856         if (ret < 0)
1857                 goto out;
1858         ret = gspca_dev->sd_desc->init(gspca_dev);
1859         if (ret < 0)
1860                 goto out;
1861         ret = gspca_set_alt0(gspca_dev);
1862         if (ret < 0)
1863                 goto out;
1864         gspca_set_default_mode(gspca_dev);
1865
1866         mutex_init(&gspca_dev->usb_lock);
1867         mutex_init(&gspca_dev->read_lock);
1868         mutex_init(&gspca_dev->queue_lock);
1869         init_waitqueue_head(&gspca_dev->wq);
1870
1871         /* init video stuff */
1872         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1873         gspca_dev->vdev.parent = &dev->dev;
1874         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1875         gspca_dev->vdev.fops = &gspca_dev->fops;
1876         gspca_dev->fops.owner = module;         /* module protection */
1877         gspca_dev->present = 1;
1878         ret = video_register_device(&gspca_dev->vdev,
1879                                   VFL_TYPE_GRABBER,
1880                                   video_nr);
1881         if (ret < 0) {
1882                 err("video_register_device err %d", ret);
1883                 goto out;
1884         }
1885
1886         usb_set_intfdata(intf, gspca_dev);
1887         PDEBUG(D_PROBE, "probe ok");
1888         return 0;
1889 out:
1890         kref_put(&gspca_dev->kref, gspca_delete);
1891         return ret;
1892 }
1893 EXPORT_SYMBOL(gspca_dev_probe);
1894
1895 /*
1896  * USB disconnection
1897  *
1898  * This function must be called by the sub-driver
1899  * when the device disconnects, after the specific resources are freed.
1900  */
1901 void gspca_disconnect(struct usb_interface *intf)
1902 {
1903         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1904
1905         usb_set_intfdata(intf, NULL);
1906
1907 /* We don't want people trying to open up the device */
1908         video_unregister_device(&gspca_dev->vdev);
1909
1910         gspca_dev->present = 0;
1911         gspca_dev->streaming = 0;
1912
1913         kref_put(&gspca_dev->kref, gspca_delete);
1914
1915         PDEBUG(D_PROBE, "disconnect complete");
1916 }
1917 EXPORT_SYMBOL(gspca_disconnect);
1918
1919 #ifdef CONFIG_PM
1920 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1921 {
1922         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1923
1924         if (!gspca_dev->streaming)
1925                 return 0;
1926         gspca_dev->frozen = 1;          /* avoid urb error messages */
1927         if (gspca_dev->sd_desc->stopN)
1928                 gspca_dev->sd_desc->stopN(gspca_dev);
1929         destroy_urbs(gspca_dev);
1930         gspca_set_alt0(gspca_dev);
1931         if (gspca_dev->sd_desc->stop0)
1932                 gspca_dev->sd_desc->stop0(gspca_dev);
1933         return 0;
1934 }
1935 EXPORT_SYMBOL(gspca_suspend);
1936
1937 int gspca_resume(struct usb_interface *intf)
1938 {
1939         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1940
1941         gspca_dev->frozen = 0;
1942         gspca_dev->sd_desc->init(gspca_dev);
1943         if (gspca_dev->streaming)
1944                 return gspca_init_transfer(gspca_dev);
1945         return 0;
1946 }
1947 EXPORT_SYMBOL(gspca_resume);
1948 #endif
1949 /* -- cam driver utility functions -- */
1950
1951 /* auto gain and exposure algorithm based on the knee algorithm described here:
1952    http://ytse.tricolour.net/docs/LowLightOptimization.html
1953
1954    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1955    where changed. */
1956 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1957         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1958 {
1959         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1960         const struct ctrl *gain_ctrl = NULL;
1961         const struct ctrl *exposure_ctrl = NULL;
1962         const struct ctrl *autogain_ctrl = NULL;
1963         int retval = 0;
1964
1965         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1966                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1967                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1968                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1969                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1970                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1971                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1972         }
1973         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1974                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1975                         "on cam without (auto)gain/exposure");
1976                 return 0;
1977         }
1978
1979         if (gain_ctrl->get(gspca_dev, &gain) ||
1980                         exposure_ctrl->get(gspca_dev, &exposure) ||
1981                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1982                 return 0;
1983
1984         orig_gain = gain;
1985         orig_exposure = exposure;
1986
1987         /* If we are of a multiple of deadzone, do multiple steps to reach the
1988            desired lumination fast (with the risc of a slight overshoot) */
1989         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1990
1991         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1992                 avg_lum, desired_avg_lum, steps);
1993
1994         for (i = 0; i < steps; i++) {
1995                 if (avg_lum > desired_avg_lum) {
1996                         if (gain > gain_knee)
1997                                 gain--;
1998                         else if (exposure > exposure_knee)
1999                                 exposure--;
2000                         else if (gain > gain_ctrl->qctrl.default_value)
2001                                 gain--;
2002                         else if (exposure > exposure_ctrl->qctrl.minimum)
2003                                 exposure--;
2004                         else if (gain > gain_ctrl->qctrl.minimum)
2005                                 gain--;
2006                         else
2007                                 break;
2008                 } else {
2009                         if (gain < gain_ctrl->qctrl.default_value)
2010                                 gain++;
2011                         else if (exposure < exposure_knee)
2012                                 exposure++;
2013                         else if (gain < gain_knee)
2014                                 gain++;
2015                         else if (exposure < exposure_ctrl->qctrl.maximum)
2016                                 exposure++;
2017                         else if (gain < gain_ctrl->qctrl.maximum)
2018                                 gain++;
2019                         else
2020                                 break;
2021                 }
2022         }
2023
2024         if (gain != orig_gain) {
2025                 gain_ctrl->set(gspca_dev, gain);
2026                 retval = 1;
2027         }
2028         if (exposure != orig_exposure) {
2029                 exposure_ctrl->set(gspca_dev, exposure);
2030                 retval = 1;
2031         }
2032
2033         return retval;
2034 }
2035 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2036
2037 /* -- module insert / remove -- */
2038 static int __init gspca_init(void)
2039 {
2040         info("main v%d.%d.%d registered",
2041                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2042                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2043                 DRIVER_VERSION_NUMBER & 0xff);
2044         return 0;
2045 }
2046 static void __exit gspca_exit(void)
2047 {
2048         info("main deregistered");
2049 }
2050
2051 module_init(gspca_init);
2052 module_exit(gspca_exit);
2053
2054 #ifdef GSPCA_DEBUG
2055 module_param_named(debug, gspca_debug, int, 0644);
2056 MODULE_PARM_DESC(debug,
2057                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2058                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2059                 " 0x0100: v4l2");
2060 #endif