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             && 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 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 660 {
 661         int i;
 662
 663         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 664         gspca_dev->curr_mode = i;
 665         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 666         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 667         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 668 }
 669
 670 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 671                         int width, int height)
 672 {
 673         int i;
 674
 675         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 676                 if (width >= gspca_dev->cam.cam_mode[i].width
 677                     && height >= gspca_dev->cam.cam_mode[i].height)
 678                         break;
 679         }
 680         return i;
 681 }
 682
 683 /*
 684  * search a mode with the right pixel format
 685  */
 686 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 687                         int mode,
 688                         int pixfmt)
 689 {
 690         int modeU, modeD;
 691
 692         modeU = modeD = mode;
 693         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 694                 if (--modeD >= 0) {
 695                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 696                                                                 == pixfmt)
 697                                 return modeD;
 698                 }
 699                 if (++modeU < gspca_dev->cam.nmodes) {
 700                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 701                                                                 == pixfmt)
 702                                 return modeU;
 703                 }
 704         }
 705         return -EINVAL;
 706 }
 707
 708 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 709                                 struct v4l2_fmtdesc *fmtdesc)
 710 {
 711         struct gspca_dev *gspca_dev = priv;
 712         int i, j, index;
 713         __u32 fmt_tb[8];
 714
 715         /* give an index to each format */
 716         index = 0;
 717         j = 0;
 718         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 719                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 720                 j = 0;
 721                 for (;;) {
 722                         if (fmt_tb[j] == fmt_tb[index])
 723                                 break;
 724                         j++;
 725                 }
 726                 if (j == index) {
 727                         if (fmtdesc->index == index)
 728                                 break;          /* new format */
 729                         index++;
 730                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 731                                 return -EINVAL;
 732                 }
 733         }
 734         if (i < 0)
 735                 return -EINVAL;         /* no more format */
 736
 737         fmtdesc->pixelformat = fmt_tb[index];
 738         if (gspca_is_compressed(fmt_tb[index]))
 739                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 740         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 741         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 742         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 743         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 744         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 745         fmtdesc->description[4] = '\0';
 746         return 0;
 747 }
 748
 749 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 750                             struct v4l2_format *fmt)
 751 {
 752         struct gspca_dev *gspca_dev = priv;
 753         int mode;
 754
 755         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 756                 return -EINVAL;
 757         mode = gspca_dev->curr_mode;
 758         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 759                 sizeof fmt->fmt.pix);
 760         return 0;
 761 }
 762
 763 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 764                         struct v4l2_format *fmt)
 765 {
 766         int w, h, mode, mode2;
 767
 768         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 769                 return -EINVAL;
 770         w = fmt->fmt.pix.width;
 771         h = fmt->fmt.pix.height;
 772
 773 #ifdef GSPCA_DEBUG
 774         if (gspca_debug & D_CONF)
 775                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 776 #endif
 777         /* search the closest mode for width and height */
 778         mode = wxh_to_mode(gspca_dev, w, h);
 779
 780         /* OK if right palette */
 781         if (gspca_dev->cam.cam_mode[mode].pixelformat
 782                                                 != fmt->fmt.pix.pixelformat) {
 783
 784                 /* else, search the closest mode with the same pixel format */
 785                 mode2 = gspca_get_mode(gspca_dev, mode,
 786                                         fmt->fmt.pix.pixelformat);
 787                 if (mode2 >= 0)
 788                         mode = mode2;
 789 /*              else
 790                         ;                * no chance, return this mode */
 791         }
 792         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 793                 sizeof fmt->fmt.pix);
 794         return mode;                    /* used when s_fmt */
 795 }
 796
 797 static int vidioc_try_fmt_vid_cap(struct file *file,
 798                               void *priv,
 799                               struct v4l2_format *fmt)
 800 {
 801         struct gspca_dev *gspca_dev = priv;
 802         int ret;
 803
 804         ret = try_fmt_vid_cap(gspca_dev, fmt);
 805         if (ret < 0)
 806                 return ret;
 807         return 0;
 808 }
 809
 810 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 811                             struct v4l2_format *fmt)
 812 {
 813         struct gspca_dev *gspca_dev = priv;
 814         int ret;
 815
 816         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 817                 return -ERESTARTSYS;
 818
 819         ret = try_fmt_vid_cap(gspca_dev, fmt);
 820         if (ret < 0)
 821                 goto out;
 822
 823         if (gspca_dev->nframes != 0
 824             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 825                 ret = -EINVAL;
 826                 goto out;
 827         }
 828
 829         if (ret == gspca_dev->curr_mode) {
 830                 ret = 0;
 831                 goto out;                       /* same mode */
 832         }
 833
 834         if (gspca_dev->streaming) {
 835                 ret = -EBUSY;
 836                 goto out;
 837         }
 838         gspca_dev->width = fmt->fmt.pix.width;
 839         gspca_dev->height = fmt->fmt.pix.height;
 840         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 841         gspca_dev->curr_mode = ret;
 842
 843         ret = 0;
 844 out:
 845         mutex_unlock(&gspca_dev->queue_lock);
 846         return ret;
 847 }
 848
 849 static void gspca_delete(struct kref *kref)
 850 {
 851         struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
 852
 853         PDEBUG(D_STREAM, "device deleted");
 854
 855         kfree(gspca_dev->usb_buf);
 856         kfree(gspca_dev);
 857 }
 858
 859 static int dev_open(struct inode *inode, struct file *file)
 860 {
 861         struct gspca_dev *gspca_dev;
 862         int ret;
 863
 864         PDEBUG(D_STREAM, "%s open", current->comm);
 865         gspca_dev = video_drvdata(file);
 866         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 867                 return -ERESTARTSYS;
 868         if (!gspca_dev->present) {
 869                 ret = -ENODEV;
 870                 goto out;
 871         }
 872
 873         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 874                 ret = -EBUSY;
 875                 goto out;
 876         }
 877
 878         /* protect the subdriver against rmmod */
 879         if (!try_module_get(gspca_dev->module)) {
 880                 ret = -ENODEV;
 881                 goto out;
 882         }
 883
 884         gspca_dev->users++;
 885
 886         /* one more user */
 887         kref_get(&gspca_dev->kref);
 888
 889         file->private_data = gspca_dev;
 890 #ifdef GSPCA_DEBUG
 891         /* activate the v4l2 debug */
 892         if (gspca_debug & D_V4L2)
 893                 gspca_dev->vdev->debug |= V4L2_DEBUG_IOCTL
 894                                         | V4L2_DEBUG_IOCTL_ARG;
 895         else
 896                 gspca_dev->vdev->debug &= ~(V4L2_DEBUG_IOCTL
 897                                         | V4L2_DEBUG_IOCTL_ARG);
 898 #endif
 899         ret = 0;
 900 out:
 901         mutex_unlock(&gspca_dev->queue_lock);
 902         if (ret != 0)
 903                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 904         else
 905                 PDEBUG(D_STREAM, "open done");
 906         return ret;
 907 }
 908
 909 static int dev_close(struct inode *inode, struct file *file)
 910 {
 911         struct gspca_dev *gspca_dev = file->private_data;
 912
 913         PDEBUG(D_STREAM, "%s close", current->comm);
 914         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 915                 return -ERESTARTSYS;
 916         gspca_dev->users--;
 917
 918         /* if the file did the capture, free the streaming resources */
 919         if (gspca_dev->capt_file == file) {
 920                 if (gspca_dev->streaming) {
 921                         mutex_lock(&gspca_dev->usb_lock);
 922                         gspca_stream_off(gspca_dev);
 923                         mutex_unlock(&gspca_dev->usb_lock);
 924                 }
 925                 frame_free(gspca_dev);
 926                 gspca_dev->capt_file = NULL;
 927                 gspca_dev->memory = GSPCA_MEMORY_NO;
 928         }
 929         file->private_data = NULL;
 930         module_put(gspca_dev->module);
 931         mutex_unlock(&gspca_dev->queue_lock);
 932
 933         PDEBUG(D_STREAM, "close done");
 934
 935         kref_put(&gspca_dev->kref, gspca_delete);
 936
 937         return 0;
 938 }
 939
 940 static int vidioc_querycap(struct file *file, void  *priv,
 941                            struct v4l2_capability *cap)
 942 {
 943         struct gspca_dev *gspca_dev = priv;
 944
 945         memset(cap, 0, sizeof *cap);
 946         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 947         if (gspca_dev->dev->product != NULL) {
 948                 strncpy(cap->card, gspca_dev->dev->product,
 949                         sizeof cap->card);
 950         } else {
 951                 snprintf(cap->card, sizeof cap->card,
 952                         "USB Camera (%04x:%04x)",
 953                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 954                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 955         }
 956         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 957                 sizeof cap->bus_info);
 958         cap->version = DRIVER_VERSION_NUMBER;
 959         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 960                           | V4L2_CAP_STREAMING
 961                           | V4L2_CAP_READWRITE;
 962         return 0;
 963 }
 964
 965 static int vidioc_queryctrl(struct file *file, void *priv,
 966                            struct v4l2_queryctrl *q_ctrl)
 967 {
 968         struct gspca_dev *gspca_dev = priv;
 969         int i, ix;
 970         u32 id;
 971
 972         ix = -1;
 973         id = q_ctrl->id;
 974         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 975                 id &= V4L2_CTRL_ID_MASK;
 976                 id++;
 977                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 978                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 979                                 continue;
 980                         if (ix < 0) {
 981                                 ix = i;
 982                                 continue;
 983                         }
 984                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 985                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 986                                 continue;
 987                         ix = i;
 988                 }
 989         }
 990         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 991                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 992                         ix = i;
 993                         break;
 994                 }
 995         }
 996         if (ix < 0)
 997                 return -EINVAL;
 998         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 999                 sizeof *q_ctrl);
1000         if (gspca_dev->ctrl_dis & (1 << ix))
1001                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1002         return 0;
1003 }
1004
1005 static int vidioc_s_ctrl(struct file *file, void *priv,
1006                          struct v4l2_control *ctrl)
1007 {
1008         struct gspca_dev *gspca_dev = priv;
1009         const struct ctrl *ctrls;
1010         int i, ret;
1011
1012         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1013              i < gspca_dev->sd_desc->nctrls;
1014              i++, ctrls++) {
1015                 if (ctrl->id != ctrls->qctrl.id)
1016                         continue;
1017                 if (gspca_dev->ctrl_dis & (1 << i))
1018                         return -EINVAL;
1019                 if (ctrl->value < ctrls->qctrl.minimum
1020                     || ctrl->value > ctrls->qctrl.maximum)
1021                         return -ERANGE;
1022                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1023                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1024                         return -ERESTARTSYS;
1025                 ret = ctrls->set(gspca_dev, ctrl->value);
1026                 mutex_unlock(&gspca_dev->usb_lock);
1027                 return ret;
1028         }
1029         return -EINVAL;
1030 }
1031
1032 static int vidioc_g_ctrl(struct file *file, void *priv,
1033                          struct v4l2_control *ctrl)
1034 {
1035         struct gspca_dev *gspca_dev = priv;
1036
1037         const struct ctrl *ctrls;
1038         int i, ret;
1039
1040         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1041              i < gspca_dev->sd_desc->nctrls;
1042              i++, ctrls++) {
1043                 if (ctrl->id != ctrls->qctrl.id)
1044                         continue;
1045                 if (gspca_dev->ctrl_dis & (1 << i))
1046                         return -EINVAL;
1047                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1048                         return -ERESTARTSYS;
1049                 ret = ctrls->get(gspca_dev, &ctrl->value);
1050                 mutex_unlock(&gspca_dev->usb_lock);
1051                 return ret;
1052         }
1053         return -EINVAL;
1054 }
1055
1056 static int vidioc_querymenu(struct file *file, void *priv,
1057                             struct v4l2_querymenu *qmenu)
1058 {
1059         struct gspca_dev *gspca_dev = priv;
1060
1061         if (!gspca_dev->sd_desc->querymenu)
1062                 return -EINVAL;
1063         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1064 }
1065
1066 static int vidioc_enum_input(struct file *file, void *priv,
1067                                 struct v4l2_input *input)
1068 {
1069         struct gspca_dev *gspca_dev = priv;
1070
1071         if (input->index != 0)
1072                 return -EINVAL;
1073         memset(input, 0, sizeof *input);
1074         input->type = V4L2_INPUT_TYPE_CAMERA;
1075         strncpy(input->name, gspca_dev->sd_desc->name,
1076                 sizeof input->name);
1077         return 0;
1078 }
1079
1080 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1081 {
1082         *i = 0;
1083         return 0;
1084 }
1085
1086 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1087 {
1088         if (i > 0)
1089                 return -EINVAL;
1090         return (0);
1091 }
1092
1093 static int vidioc_reqbufs(struct file *file, void *priv,
1094                           struct v4l2_requestbuffers *rb)
1095 {
1096         struct gspca_dev *gspca_dev = priv;
1097         int i, ret = 0;
1098
1099         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1100                 return -EINVAL;
1101         switch (rb->memory) {
1102         case GSPCA_MEMORY_READ:                 /* (internal call) */
1103         case V4L2_MEMORY_MMAP:
1104         case V4L2_MEMORY_USERPTR:
1105                 break;
1106         default:
1107                 return -EINVAL;
1108         }
1109         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1110                 return -ERESTARTSYS;
1111
1112         if (gspca_dev->memory != GSPCA_MEMORY_NO
1113             && gspca_dev->memory != rb->memory) {
1114                 ret = -EBUSY;
1115                 goto out;
1116         }
1117
1118         /* only one file may do the capture */
1119         if (gspca_dev->capt_file != NULL
1120             && gspca_dev->capt_file != file) {
1121                 ret = -EBUSY;
1122                 goto out;
1123         }
1124
1125         /* if allocated, the buffers must not be mapped */
1126         for (i = 0; i < gspca_dev->nframes; i++) {
1127                 if (gspca_dev->frame[i].vma_use_count) {
1128                         ret = -EBUSY;
1129                         goto out;
1130                 }
1131         }
1132
1133         /* stop streaming */
1134         if (gspca_dev->streaming) {
1135                 mutex_lock(&gspca_dev->usb_lock);
1136                 gspca_stream_off(gspca_dev);
1137                 mutex_unlock(&gspca_dev->usb_lock);
1138         }
1139
1140         /* free the previous allocated buffers, if any */
1141         if (gspca_dev->nframes != 0) {
1142                 frame_free(gspca_dev);
1143                 gspca_dev->capt_file = NULL;
1144         }
1145         if (rb->count == 0)                     /* unrequest */
1146                 goto out;
1147         gspca_dev->memory = rb->memory;
1148         ret = frame_alloc(gspca_dev, rb->count);
1149         if (ret == 0) {
1150                 rb->count = gspca_dev->nframes;
1151                 gspca_dev->capt_file = file;
1152         }
1153 out:
1154         mutex_unlock(&gspca_dev->queue_lock);
1155         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1156         return ret;
1157 }
1158
1159 static int vidioc_querybuf(struct file *file, void *priv,
1160                            struct v4l2_buffer *v4l2_buf)
1161 {
1162         struct gspca_dev *gspca_dev = priv;
1163         struct gspca_frame *frame;
1164
1165         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1166             || v4l2_buf->index < 0
1167             || v4l2_buf->index >= gspca_dev->nframes)
1168                 return -EINVAL;
1169
1170         frame = &gspca_dev->frame[v4l2_buf->index];
1171         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1172         return 0;
1173 }
1174
1175 static int vidioc_streamon(struct file *file, void *priv,
1176                            enum v4l2_buf_type buf_type)
1177 {
1178         struct gspca_dev *gspca_dev = priv;
1179         int ret;
1180
1181         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1182                 return -EINVAL;
1183         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1184                 return -ERESTARTSYS;
1185         if (!gspca_dev->present) {
1186                 ret = -ENODEV;
1187                 goto out;
1188         }
1189         if (gspca_dev->nframes == 0) {
1190                 ret = -EINVAL;
1191                 goto out;
1192         }
1193         if (!gspca_dev->streaming) {
1194                 ret = gspca_init_transfer(gspca_dev);
1195                 if (ret < 0)
1196                         goto out;
1197         }
1198 #ifdef GSPCA_DEBUG
1199         if (gspca_debug & D_STREAM) {
1200                 PDEBUG_MODE("stream on OK",
1201                         gspca_dev->pixfmt,
1202                         gspca_dev->width,
1203                         gspca_dev->height);
1204         }
1205 #endif
1206         ret = 0;
1207 out:
1208         mutex_unlock(&gspca_dev->queue_lock);
1209         return ret;
1210 }
1211
1212 static int vidioc_streamoff(struct file *file, void *priv,
1213                                 enum v4l2_buf_type buf_type)
1214 {
1215         struct gspca_dev *gspca_dev = priv;
1216         int i, ret;
1217
1218         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1219                 return -EINVAL;
1220         if (!gspca_dev->streaming)
1221                 return 0;
1222         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1223                 return -ERESTARTSYS;
1224
1225         /* stop streaming */
1226         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1227                 ret = -ERESTARTSYS;
1228                 goto out;
1229         }
1230         gspca_stream_off(gspca_dev);
1231         mutex_unlock(&gspca_dev->usb_lock);
1232
1233         /* empty the application queues */
1234         for (i = 0; i < gspca_dev->nframes; i++)
1235                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1236         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1237         gspca_dev->last_packet_type = DISCARD_PACKET;
1238         gspca_dev->sequence = 0;
1239         atomic_set(&gspca_dev->nevent, 0);
1240         ret = 0;
1241 out:
1242         mutex_unlock(&gspca_dev->queue_lock);
1243         return ret;
1244 }
1245
1246 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1247                         struct v4l2_jpegcompression *jpegcomp)
1248 {
1249         struct gspca_dev *gspca_dev = priv;
1250         int ret;
1251
1252         if (!gspca_dev->sd_desc->get_jcomp)
1253                 return -EINVAL;
1254         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1255                 return -ERESTARTSYS;
1256         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1257         mutex_unlock(&gspca_dev->usb_lock);
1258         return ret;
1259 }
1260
1261 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1262                         struct v4l2_jpegcompression *jpegcomp)
1263 {
1264         struct gspca_dev *gspca_dev = priv;
1265         int ret;
1266
1267         if (!gspca_dev->sd_desc->set_jcomp)
1268                 return -EINVAL;
1269         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1270                 return -ERESTARTSYS;
1271         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1272         mutex_unlock(&gspca_dev->usb_lock);
1273         return ret;
1274 }
1275
1276 static int vidioc_g_parm(struct file *filp, void *priv,
1277                         struct v4l2_streamparm *parm)
1278 {
1279         struct gspca_dev *gspca_dev = priv;
1280
1281         memset(parm, 0, sizeof *parm);
1282         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1283         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1284         return 0;
1285 }
1286
1287 static int vidioc_s_parm(struct file *filp, void *priv,
1288                         struct v4l2_streamparm *parm)
1289 {
1290         struct gspca_dev *gspca_dev = priv;
1291         int n;
1292
1293         n = parm->parm.capture.readbuffers;
1294         if (n == 0 || n > GSPCA_MAX_FRAMES)
1295                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1296         else
1297                 gspca_dev->nbufread = n;
1298         return 0;
1299 }
1300
1301 static int vidioc_s_std(struct file *filp, void *priv,
1302                         v4l2_std_id *parm)
1303 {
1304         return 0;
1305 }
1306
1307 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1308 static int vidiocgmbuf(struct file *file, void *priv,
1309                         struct video_mbuf *mbuf)
1310 {
1311         struct gspca_dev *gspca_dev = file->private_data;
1312         int i;
1313
1314         PDEBUG(D_STREAM, "cgmbuf");
1315         if (gspca_dev->nframes == 0) {
1316                 int ret;
1317
1318                 {
1319                         struct v4l2_format fmt;
1320
1321                         memset(&fmt, 0, sizeof fmt);
1322                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1323                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1324                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1325                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1326                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1327                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1328                         if (ret != 0)
1329                                 return ret;
1330                 }
1331                 {
1332                         struct v4l2_requestbuffers rb;
1333
1334                         memset(&rb, 0, sizeof rb);
1335                         rb.count = 4;
1336                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1337                         rb.memory = V4L2_MEMORY_MMAP;
1338                         ret = vidioc_reqbufs(file, priv, &rb);
1339                         if (ret != 0)
1340                                 return ret;
1341                 }
1342         }
1343         mbuf->frames = gspca_dev->nframes;
1344         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1345         for (i = 0; i < mbuf->frames; i++)
1346                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1347         return 0;
1348 }
1349 #endif
1350
1351 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1352 {
1353         struct gspca_dev *gspca_dev = file->private_data;
1354         struct gspca_frame *frame;
1355         struct page *page;
1356         unsigned long addr, start, size;
1357         int i, ret;
1358
1359         start = vma->vm_start;
1360         size = vma->vm_end - vma->vm_start;
1361         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1362
1363         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1364                 return -ERESTARTSYS;
1365         if (!gspca_dev->present) {
1366                 ret = -ENODEV;
1367                 goto out;
1368         }
1369         if (gspca_dev->capt_file != file) {
1370                 ret = -EINVAL;
1371                 goto out;
1372         }
1373
1374         frame = NULL;
1375         for (i = 0; i < gspca_dev->nframes; ++i) {
1376                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1377                         PDEBUG(D_STREAM, "mmap bad memory type");
1378                         break;
1379                 }
1380                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1381                                                 == vma->vm_pgoff) {
1382                         frame = &gspca_dev->frame[i];
1383                         break;
1384                 }
1385         }
1386         if (frame == NULL) {
1387                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1388                 ret = -EINVAL;
1389                 goto out;
1390         }
1391 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1392         /* v4l1 maps all the buffers */
1393         if (i != 0
1394             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1395 #endif
1396             if (size != frame->v4l2_buf.length) {
1397                 PDEBUG(D_STREAM, "mmap bad size");
1398                 ret = -EINVAL;
1399                 goto out;
1400         }
1401
1402         /*
1403          * - VM_IO marks the area as being a mmaped region for I/O to a
1404          *   device. It also prevents the region from being core dumped.
1405          */
1406         vma->vm_flags |= VM_IO;
1407
1408         addr = (unsigned long) frame->data;
1409         while (size > 0) {
1410                 page = vmalloc_to_page((void *) addr);
1411                 ret = vm_insert_page(vma, start, page);
1412                 if (ret < 0)
1413                         goto out;
1414                 start += PAGE_SIZE;
1415                 addr += PAGE_SIZE;
1416                 size -= PAGE_SIZE;
1417         }
1418
1419         vma->vm_ops = &gspca_vm_ops;
1420         vma->vm_private_data = frame;
1421         gspca_vm_open(vma);
1422         ret = 0;
1423 out:
1424         mutex_unlock(&gspca_dev->queue_lock);
1425         return ret;
1426 }
1427
1428 /*
1429  * wait for a video frame
1430  *
1431  * If a frame is ready, its index is returned.
1432  */
1433 static int frame_wait(struct gspca_dev *gspca_dev,
1434                         int nonblock_ing)
1435 {
1436         struct gspca_frame *frame;
1437         int i, j, ret;
1438
1439         /* check if a frame is ready */
1440         i = gspca_dev->fr_o;
1441         j = gspca_dev->fr_queue[i];
1442         frame = &gspca_dev->frame[j];
1443         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1444                 atomic_dec(&gspca_dev->nevent);
1445                 goto ok;
1446         }
1447         if (nonblock_ing)                       /* no frame yet */
1448                 return -EAGAIN;
1449
1450         /* wait till a frame is ready */
1451         for (;;) {
1452                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1453                                         atomic_read(&gspca_dev->nevent) > 0,
1454                                         msecs_to_jiffies(3000));
1455                 if (ret <= 0) {
1456                         if (ret < 0)
1457                                 return ret;     /* interrupt */
1458                         return -EIO;            /* timeout */
1459                 }
1460                 atomic_dec(&gspca_dev->nevent);
1461                 if (!gspca_dev->streaming || !gspca_dev->present)
1462                         return -EIO;
1463                 i = gspca_dev->fr_o;
1464                 j = gspca_dev->fr_queue[i];
1465                 frame = &gspca_dev->frame[j];
1466                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1467                         break;
1468         }
1469 ok:
1470         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1471         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1472                 gspca_dev->fr_q,
1473                 gspca_dev->fr_i,
1474                 gspca_dev->fr_o);
1475
1476         if (gspca_dev->sd_desc->dq_callback) {
1477                 mutex_lock(&gspca_dev->usb_lock);
1478                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1479                 mutex_unlock(&gspca_dev->usb_lock);
1480         }
1481         return j;
1482 }
1483
1484 /*
1485  * dequeue a video buffer
1486  *
1487  * If nonblock_ing is false, block until a buffer is available.
1488  */
1489 static int vidioc_dqbuf(struct file *file, void *priv,
1490                         struct v4l2_buffer *v4l2_buf)
1491 {
1492         struct gspca_dev *gspca_dev = priv;
1493         struct gspca_frame *frame;
1494         int i, ret;
1495
1496         PDEBUG(D_FRAM, "dqbuf");
1497         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1498                 return -EINVAL;
1499         if (v4l2_buf->memory != gspca_dev->memory)
1500                 return -EINVAL;
1501
1502         /* if not streaming, be sure the application will not loop forever */
1503         if (!(file->f_flags & O_NONBLOCK)
1504             && !gspca_dev->streaming && gspca_dev->users == 1)
1505                 return -EINVAL;
1506
1507         /* only the capturing file may dequeue */
1508         if (gspca_dev->capt_file != file)
1509                 return -EINVAL;
1510
1511         /* only one dequeue / read at a time */
1512         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1513                 return -ERESTARTSYS;
1514
1515         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1516         if (ret < 0)
1517                 goto out;
1518         i = ret;                                /* frame index */
1519         frame = &gspca_dev->frame[i];
1520         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1521                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1522                                  frame->data,
1523                                  frame->v4l2_buf.bytesused)) {
1524                         PDEBUG(D_ERR|D_STREAM,
1525                                 "dqbuf cp to user failed");
1526                         ret = -EFAULT;
1527                         goto out;
1528                 }
1529         }
1530         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1531         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1532         PDEBUG(D_FRAM, "dqbuf %d", i);
1533         ret = 0;
1534 out:
1535         mutex_unlock(&gspca_dev->read_lock);
1536         return ret;
1537 }
1538
1539 /*
1540  * queue a video buffer
1541  *
1542  * Attempting to queue a buffer that has already been
1543  * queued will return -EINVAL.
1544  */
1545 static int vidioc_qbuf(struct file *file, void *priv,
1546                         struct v4l2_buffer *v4l2_buf)
1547 {
1548         struct gspca_dev *gspca_dev = priv;
1549         struct gspca_frame *frame;
1550         int i, index, ret;
1551
1552         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1553         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1554                 return -EINVAL;
1555
1556         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1557                 return -ERESTARTSYS;
1558
1559         index = v4l2_buf->index;
1560         if ((unsigned) index >= gspca_dev->nframes) {
1561                 PDEBUG(D_FRAM,
1562                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1563                 ret = -EINVAL;
1564                 goto out;
1565         }
1566         if (v4l2_buf->memory != gspca_dev->memory) {
1567                 PDEBUG(D_FRAM, "qbuf bad memory type");
1568                 ret = -EINVAL;
1569                 goto out;
1570         }
1571
1572         frame = &gspca_dev->frame[index];
1573         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1574                 PDEBUG(D_FRAM, "qbuf bad state");
1575                 ret = -EINVAL;
1576                 goto out;
1577         }
1578
1579         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1580
1581         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1582                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1583                 frame->v4l2_buf.length = v4l2_buf->length;
1584         }
1585
1586         /* put the buffer in the 'queued' queue */
1587         i = gspca_dev->fr_q;
1588         gspca_dev->fr_queue[i] = index;
1589         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1590         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1591                 gspca_dev->fr_q,
1592                 gspca_dev->fr_i,
1593                 gspca_dev->fr_o);
1594
1595         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1596         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1597         ret = 0;
1598 out:
1599         mutex_unlock(&gspca_dev->queue_lock);
1600         return ret;
1601 }
1602
1603 /*
1604  * allocate the resources for read()
1605  */
1606 static int read_alloc(struct gspca_dev *gspca_dev,
1607                         struct file *file)
1608 {
1609         struct v4l2_buffer v4l2_buf;
1610         int i, ret;
1611
1612         PDEBUG(D_STREAM, "read alloc");
1613         if (gspca_dev->nframes == 0) {
1614                 struct v4l2_requestbuffers rb;
1615
1616                 memset(&rb, 0, sizeof rb);
1617                 rb.count = gspca_dev->nbufread;
1618                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1619                 rb.memory = GSPCA_MEMORY_READ;
1620                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1621                 if (ret != 0) {
1622                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1623                         return ret;
1624                 }
1625                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1626                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1627                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1628                 for (i = 0; i < gspca_dev->nbufread; i++) {
1629                         v4l2_buf.index = i;
1630                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1631                         if (ret != 0) {
1632                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1633                                 return ret;
1634                         }
1635                 }
1636                 gspca_dev->memory = GSPCA_MEMORY_READ;
1637         }
1638
1639         /* start streaming */
1640         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1641         if (ret != 0)
1642                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1643         return ret;
1644 }
1645
1646 static unsigned int dev_poll(struct file *file, poll_table *wait)
1647 {
1648         struct gspca_dev *gspca_dev = file->private_data;
1649         int i, ret;
1650
1651         PDEBUG(D_FRAM, "poll");
1652
1653         poll_wait(file, &gspca_dev->wq, wait);
1654         if (!gspca_dev->present)
1655                 return POLLERR;
1656
1657         /* if reqbufs is not done, the user would use read() */
1658         if (gspca_dev->nframes == 0) {
1659                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1660                         return POLLERR;         /* not the 1st time */
1661                 ret = read_alloc(gspca_dev, file);
1662                 if (ret != 0)
1663                         return POLLERR;
1664         }
1665
1666         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1667                 return POLLERR;
1668         if (!gspca_dev->present) {
1669                 ret = POLLERR;
1670                 goto out;
1671         }
1672
1673         /* check the next incoming buffer */
1674         i = gspca_dev->fr_o;
1675         i = gspca_dev->fr_queue[i];
1676         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1677                 ret = POLLIN | POLLRDNORM;      /* something to read */
1678         else
1679                 ret = 0;
1680 out:
1681         mutex_unlock(&gspca_dev->queue_lock);
1682         return ret;
1683 }
1684
1685 static ssize_t dev_read(struct file *file, char __user *data,
1686                     size_t count, loff_t *ppos)
1687 {
1688         struct gspca_dev *gspca_dev = file->private_data;
1689         struct gspca_frame *frame;
1690         struct v4l2_buffer v4l2_buf;
1691         struct timeval timestamp;
1692         int n, ret, ret2;
1693
1694         PDEBUG(D_FRAM, "read (%zd)", count);
1695         if (!gspca_dev->present)
1696                 return -ENODEV;
1697         switch (gspca_dev->memory) {
1698         case GSPCA_MEMORY_NO:                   /* first time */
1699                 ret = read_alloc(gspca_dev, file);
1700                 if (ret != 0)
1701                         return ret;
1702                 break;
1703         case GSPCA_MEMORY_READ:
1704                 if (gspca_dev->capt_file == file)
1705                         break;
1706                 /* fall thru */
1707         default:
1708                 return -EINVAL;
1709         }
1710
1711         /* get a frame */
1712         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1713         timestamp.tv_sec--;
1714         n = 2;
1715         for (;;) {
1716                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1717                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1718                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1719                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1720                 if (ret != 0) {
1721                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1722                         return ret;
1723                 }
1724
1725                 /* if the process slept for more than 1 second,
1726                  * get a newer frame */
1727                 frame = &gspca_dev->frame[v4l2_buf.index];
1728                 if (--n < 0)
1729                         break;                  /* avoid infinite loop */
1730                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1731                         break;
1732                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1733                 if (ret != 0) {
1734                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1735                         return ret;
1736                 }
1737         }
1738
1739         /* copy the frame */
1740         if (count > frame->v4l2_buf.bytesused)
1741                 count = frame->v4l2_buf.bytesused;
1742         ret = copy_to_user(data, frame->data, count);
1743         if (ret != 0) {
1744                 PDEBUG(D_ERR|D_STREAM,
1745                         "read cp to user lack %d / %zd", ret, count);
1746                 ret = -EFAULT;
1747                 goto out;
1748         }
1749         ret = count;
1750 out:
1751         /* in each case, requeue the buffer */
1752         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1753         if (ret2 != 0)
1754                 return ret2;
1755         return ret;
1756 }
1757
1758 static struct file_operations dev_fops = {
1759         .owner = THIS_MODULE,
1760         .open = dev_open,
1761         .release = dev_close,
1762         .read = dev_read,
1763         .mmap = dev_mmap,
1764         .ioctl = video_ioctl2,
1765 #ifdef CONFIG_COMPAT
1766         .compat_ioctl = v4l_compat_ioctl32,
1767 #endif
1768         .llseek = no_llseek,
1769         .poll   = dev_poll,
1770 };
1771
1772 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1773         .vidioc_querycap        = vidioc_querycap,
1774         .vidioc_dqbuf           = vidioc_dqbuf,
1775         .vidioc_qbuf            = vidioc_qbuf,
1776         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1777         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1778         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1779         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1780         .vidioc_streamon        = vidioc_streamon,
1781         .vidioc_queryctrl       = vidioc_queryctrl,
1782         .vidioc_g_ctrl          = vidioc_g_ctrl,
1783         .vidioc_s_ctrl          = vidioc_s_ctrl,
1784         .vidioc_querymenu       = vidioc_querymenu,
1785         .vidioc_enum_input      = vidioc_enum_input,
1786         .vidioc_g_input         = vidioc_g_input,
1787         .vidioc_s_input         = vidioc_s_input,
1788         .vidioc_reqbufs         = vidioc_reqbufs,
1789         .vidioc_querybuf        = vidioc_querybuf,
1790         .vidioc_streamoff       = vidioc_streamoff,
1791         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1792         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1793         .vidioc_g_parm          = vidioc_g_parm,
1794         .vidioc_s_parm          = vidioc_s_parm,
1795         .vidioc_s_std           = vidioc_s_std,
1796 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1797         .vidiocgmbuf          = vidiocgmbuf,
1798 #endif
1799 };
1800
1801 static struct video_device gspca_template = {
1802         .name = "gspca main driver",
1803         .fops = &dev_fops,
1804         .ioctl_ops = &dev_ioctl_ops,
1805         .release = video_device_release,
1806         .minor = -1,
1807 };
1808
1809 /*
1810  * probe and create a new gspca device
1811  *
1812  * This function must be called by the sub-driver when it is
1813  * called for probing a new device.
1814  */
1815 int gspca_dev_probe(struct usb_interface *intf,
1816                 const struct usb_device_id *id,
1817                 const struct sd_desc *sd_desc,
1818                 int dev_size,
1819                 struct module *module)
1820 {
1821         struct usb_interface_descriptor *interface;
1822         struct gspca_dev *gspca_dev;
1823         struct usb_device *dev = interface_to_usbdev(intf);
1824         int ret;
1825
1826         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1827
1828         /* we don't handle multi-config cameras */
1829         if (dev->descriptor.bNumConfigurations != 1)
1830                 return -ENODEV;
1831         interface = &intf->cur_altsetting->desc;
1832         if (interface->bInterfaceNumber > 0)
1833                 return -ENODEV;
1834
1835         /* create the device */
1836         if (dev_size < sizeof *gspca_dev)
1837                 dev_size = sizeof *gspca_dev;
1838         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1839         if (!gspca_dev) {
1840                 err("couldn't kzalloc gspca struct");
1841                 return -ENOMEM;
1842         }
1843         kref_init(&gspca_dev->kref);
1844         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1845         if (!gspca_dev->usb_buf) {
1846                 err("out of memory");
1847                 ret = -ENOMEM;
1848                 goto out;
1849         }
1850         gspca_dev->dev = dev;
1851         gspca_dev->iface = interface->bInterfaceNumber;
1852         gspca_dev->nbalt = intf->num_altsetting;
1853         gspca_dev->sd_desc = sd_desc;
1854         gspca_dev->nbufread = 2;
1855
1856         /* configure the subdriver and initialize the USB device */
1857         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1858         if (ret < 0)
1859                 goto out;
1860         ret = gspca_dev->sd_desc->init(gspca_dev);
1861         if (ret < 0)
1862                 goto out;
1863         ret = gspca_set_alt0(gspca_dev);
1864         if (ret < 0)
1865                 goto out;
1866         gspca_set_default_mode(gspca_dev);
1867
1868         mutex_init(&gspca_dev->usb_lock);
1869         mutex_init(&gspca_dev->read_lock);
1870         mutex_init(&gspca_dev->queue_lock);
1871         init_waitqueue_head(&gspca_dev->wq);
1872
1873         /* init video stuff */
1874         gspca_dev->vdev = video_device_alloc();
1875         memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1876         gspca_dev->vdev->parent = &dev->dev;
1877         gspca_dev->module = module;
1878         gspca_dev->present = 1;
1879         video_set_drvdata(gspca_dev->vdev, gspca_dev);
1880         ret = video_register_device(gspca_dev->vdev,
1881                                   VFL_TYPE_GRABBER,
1882                                   video_nr);
1883         if (ret < 0) {
1884                 err("video_register_device err %d", ret);
1885                 video_device_release(gspca_dev->vdev);
1886                 goto out;
1887         }
1888
1889         usb_set_intfdata(intf, gspca_dev);
1890         PDEBUG(D_PROBE, "probe ok");
1891         return 0;
1892 out:
1893         kfree(gspca_dev->usb_buf);
1894         kfree(gspca_dev);
1895         return ret;
1896 }
1897 EXPORT_SYMBOL(gspca_dev_probe);
1898
1899 /*
1900  * USB disconnection
1901  *
1902  * This function must be called by the sub-driver
1903  * when the device disconnects, after the specific resources are freed.
1904  */
1905 void gspca_disconnect(struct usb_interface *intf)
1906 {
1907         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1908
1909         usb_set_intfdata(intf, NULL);
1910
1911 /* We don't want people trying to open up the device */
1912         video_unregister_device(gspca_dev->vdev);
1913
1914         gspca_dev->present = 0;
1915         gspca_dev->streaming = 0;
1916
1917         kref_put(&gspca_dev->kref, gspca_delete);
1918
1919         PDEBUG(D_PROBE, "disconnect complete");
1920 }
1921 EXPORT_SYMBOL(gspca_disconnect);
1922
1923 #ifdef CONFIG_PM
1924 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1925 {
1926         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1927
1928         if (!gspca_dev->streaming)
1929                 return 0;
1930         gspca_dev->frozen = 1;          /* avoid urb error messages */
1931         if (gspca_dev->sd_desc->stopN)
1932                 gspca_dev->sd_desc->stopN(gspca_dev);
1933         destroy_urbs(gspca_dev);
1934         gspca_set_alt0(gspca_dev);
1935         if (gspca_dev->sd_desc->stop0)
1936                 gspca_dev->sd_desc->stop0(gspca_dev);
1937         return 0;
1938 }
1939 EXPORT_SYMBOL(gspca_suspend);
1940
1941 int gspca_resume(struct usb_interface *intf)
1942 {
1943         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1944
1945         gspca_dev->frozen = 0;
1946         gspca_dev->sd_desc->init(gspca_dev);
1947         if (gspca_dev->streaming)
1948                 return gspca_init_transfer(gspca_dev);
1949         return 0;
1950 }
1951 EXPORT_SYMBOL(gspca_resume);
1952 #endif
1953 /* -- cam driver utility functions -- */
1954
1955 /* auto gain and exposure algorithm based on the knee algorithm described here:
1956    http://ytse.tricolour.net/docs/LowLightOptimization.html
1957
1958    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1959    where changed. */
1960 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1961         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1962 {
1963         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1964         const struct ctrl *gain_ctrl = NULL;
1965         const struct ctrl *exposure_ctrl = NULL;
1966         const struct ctrl *autogain_ctrl = NULL;
1967         int retval = 0;
1968
1969         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1970                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1971                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1972                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1973                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1974                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1975                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976         }
1977         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1978                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1979                         "on cam without (auto)gain/exposure");
1980                 return 0;
1981         }
1982
1983         if (gain_ctrl->get(gspca_dev, &gain) ||
1984                         exposure_ctrl->get(gspca_dev, &exposure) ||
1985                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1986                 return 0;
1987
1988         orig_gain = gain;
1989         orig_exposure = exposure;
1990
1991         /* If we are of a multiple of deadzone, do multiple steps to reach the
1992            desired lumination fast (with the risc of a slight overshoot) */
1993         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1994
1995         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1996                 avg_lum, desired_avg_lum, steps);
1997
1998         for (i = 0; i < steps; i++) {
1999                 if (avg_lum > desired_avg_lum) {
2000                         if (gain > gain_knee)
2001                                 gain--;
2002                         else if (exposure > exposure_knee)
2003                                 exposure--;
2004                         else if (gain > gain_ctrl->qctrl.default_value)
2005                                 gain--;
2006                         else if (exposure > exposure_ctrl->qctrl.minimum)
2007                                 exposure--;
2008                         else if (gain > gain_ctrl->qctrl.minimum)
2009                                 gain--;
2010                         else
2011                                 break;
2012                 } else {
2013                         if (gain < gain_ctrl->qctrl.default_value)
2014                                 gain++;
2015                         else if (exposure < exposure_knee)
2016                                 exposure++;
2017                         else if (gain < gain_knee)
2018                                 gain++;
2019                         else if (exposure < exposure_ctrl->qctrl.maximum)
2020                                 exposure++;
2021                         else if (gain < gain_ctrl->qctrl.maximum)
2022                                 gain++;
2023                         else
2024                                 break;
2025                 }
2026         }
2027
2028         if (gain != orig_gain) {
2029                 gain_ctrl->set(gspca_dev, gain);
2030                 retval = 1;
2031         }
2032         if (exposure != orig_exposure) {
2033                 exposure_ctrl->set(gspca_dev, exposure);
2034                 retval = 1;
2035         }
2036
2037         return retval;
2038 }
2039 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2040
2041 /* -- module insert / remove -- */
2042 static int __init gspca_init(void)
2043 {
2044         info("main v%d.%d.%d registered",
2045                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2046                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2047                 DRIVER_VERSION_NUMBER & 0xff);
2048         return 0;
2049 }
2050 static void __exit gspca_exit(void)
2051 {
2052         info("main deregistered");
2053 }
2054
2055 module_init(gspca_init);
2056 module_exit(gspca_exit);
2057
2058 #ifdef GSPCA_DEBUG
2059 module_param_named(debug, gspca_debug, int, 0644);
2060 MODULE_PARM_DESC(debug,
2061                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2062                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2063                 " 0x0100: v4l2");
2064 #endif