Pileus Git - ~andy/linux/blob - 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                 /* clear the bulk endpoint */
 601                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 602                         usb_clear_halt(gspca_dev->dev,
 603                                         usb_rcvintpipe(gspca_dev->dev,
 604                                                  gspca_dev->cam.epaddr));
 605
 606                 /* start the cam */
 607                 ret = gspca_dev->sd_desc->start(gspca_dev);
 608                 if (ret < 0) {
 609                         destroy_urbs(gspca_dev);
 610                         goto out;
 611                 }
 612                 gspca_dev->streaming = 1;
 613                 atomic_set(&gspca_dev->nevent, 0);
 614
 615                 /* bulk transfers are started by the subdriver */
 616                 if (gspca_dev->alt == 0)
 617                         break;
 618
 619                 /* submit the URBs */
 620                 for (n = 0; n < gspca_dev->nurbs; n++) {
 621                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 622                         if (ret < 0) {
 623                                 PDEBUG(D_ERR|D_STREAM,
 624                                         "usb_submit_urb [%d] err %d", n, ret);
 625                                 gspca_dev->streaming = 0;
 626                                 destroy_urbs(gspca_dev);
 627                                 if (ret == -ENOSPC)
 628                                         break;  /* try the previous alt */
 629                                 goto out;
 630                         }
 631                 }
 632                 if (ret >= 0)
 633                         break;
 634         }
 635 out:
 636         mutex_unlock(&gspca_dev->usb_lock);
 637         return ret;
 638 }
 639
 640 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 641 {
 642         int ret;
 643
 644         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 645         if (ret < 0)
 646                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 647         return ret;
 648 }
 649
 650 /* Note: both the queue and the usb locks should be held when calling this */
 651 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 652 {
 653         gspca_dev->streaming = 0;
 654         atomic_set(&gspca_dev->nevent, 0);
 655         if (gspca_dev->present
 656             && gspca_dev->sd_desc->stopN)
 657                 gspca_dev->sd_desc->stopN(gspca_dev);
 658         destroy_urbs(gspca_dev);
 659         gspca_set_alt0(gspca_dev);
 660         if (gspca_dev->sd_desc->stop0)
 661                 gspca_dev->sd_desc->stop0(gspca_dev);
 662         PDEBUG(D_STREAM, "stream off OK");
 663 }
 664
 665 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 666 {
 667         int i;
 668
 669         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 670         gspca_dev->curr_mode = i;
 671         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 672         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 673         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 674 }
 675
 676 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 677                         int width, int height)
 678 {
 679         int i;
 680
 681         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 682                 if (width >= gspca_dev->cam.cam_mode[i].width
 683                     && height >= gspca_dev->cam.cam_mode[i].height)
 684                         break;
 685         }
 686         return i;
 687 }
 688
 689 /*
 690  * search a mode with the right pixel format
 691  */
 692 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 693                         int mode,
 694                         int pixfmt)
 695 {
 696         int modeU, modeD;
 697
 698         modeU = modeD = mode;
 699         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 700                 if (--modeD >= 0) {
 701                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 702                                                                 == pixfmt)
 703                                 return modeD;
 704                 }
 705                 if (++modeU < gspca_dev->cam.nmodes) {
 706                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 707                                                                 == pixfmt)
 708                                 return modeU;
 709                 }
 710         }
 711         return -EINVAL;
 712 }
 713
 714 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 715                                 struct v4l2_fmtdesc *fmtdesc)
 716 {
 717         struct gspca_dev *gspca_dev = priv;
 718         int i, j, index;
 719         __u32 fmt_tb[8];
 720
 721         /* give an index to each format */
 722         index = 0;
 723         j = 0;
 724         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 725                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 726                 j = 0;
 727                 for (;;) {
 728                         if (fmt_tb[j] == fmt_tb[index])
 729                                 break;
 730                         j++;
 731                 }
 732                 if (j == index) {
 733                         if (fmtdesc->index == index)
 734                                 break;          /* new format */
 735                         index++;
 736                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 737                                 return -EINVAL;
 738                 }
 739         }
 740         if (i < 0)
 741                 return -EINVAL;         /* no more format */
 742
 743         fmtdesc->pixelformat = fmt_tb[index];
 744         if (gspca_is_compressed(fmt_tb[index]))
 745                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 746         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 747         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 748         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 749         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 750         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 751         fmtdesc->description[4] = '\0';
 752         return 0;
 753 }
 754
 755 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 756                             struct v4l2_format *fmt)
 757 {
 758         struct gspca_dev *gspca_dev = priv;
 759         int mode;
 760
 761         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 762                 return -EINVAL;
 763         mode = gspca_dev->curr_mode;
 764         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 765                 sizeof fmt->fmt.pix);
 766         return 0;
 767 }
 768
 769 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 770                         struct v4l2_format *fmt)
 771 {
 772         int w, h, mode, mode2;
 773
 774         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 775                 return -EINVAL;
 776         w = fmt->fmt.pix.width;
 777         h = fmt->fmt.pix.height;
 778
 779 #ifdef GSPCA_DEBUG
 780         if (gspca_debug & D_CONF)
 781                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 782 #endif
 783         /* search the closest mode for width and height */
 784         mode = wxh_to_mode(gspca_dev, w, h);
 785
 786         /* OK if right palette */
 787         if (gspca_dev->cam.cam_mode[mode].pixelformat
 788                                                 != fmt->fmt.pix.pixelformat) {
 789
 790                 /* else, search the closest mode with the same pixel format */
 791                 mode2 = gspca_get_mode(gspca_dev, mode,
 792                                         fmt->fmt.pix.pixelformat);
 793                 if (mode2 >= 0)
 794                         mode = mode2;
 795 /*              else
 796                         ;                * no chance, return this mode */
 797         }
 798         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 799                 sizeof fmt->fmt.pix);
 800         return mode;                    /* used when s_fmt */
 801 }
 802
 803 static int vidioc_try_fmt_vid_cap(struct file *file,
 804                               void *priv,
 805                               struct v4l2_format *fmt)
 806 {
 807         struct gspca_dev *gspca_dev = priv;
 808         int ret;
 809
 810         ret = try_fmt_vid_cap(gspca_dev, fmt);
 811         if (ret < 0)
 812                 return ret;
 813         return 0;
 814 }
 815
 816 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 817                             struct v4l2_format *fmt)
 818 {
 819         struct gspca_dev *gspca_dev = priv;
 820         int ret;
 821
 822         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 823                 return -ERESTARTSYS;
 824
 825         ret = try_fmt_vid_cap(gspca_dev, fmt);
 826         if (ret < 0)
 827                 goto out;
 828
 829         if (gspca_dev->nframes != 0
 830             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 831                 ret = -EINVAL;
 832                 goto out;
 833         }
 834
 835         if (ret == gspca_dev->curr_mode) {
 836                 ret = 0;
 837                 goto out;                       /* same mode */
 838         }
 839
 840         if (gspca_dev->streaming) {
 841                 ret = -EBUSY;
 842                 goto out;
 843         }
 844         gspca_dev->width = fmt->fmt.pix.width;
 845         gspca_dev->height = fmt->fmt.pix.height;
 846         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 847         gspca_dev->curr_mode = ret;
 848
 849         ret = 0;
 850 out:
 851         mutex_unlock(&gspca_dev->queue_lock);
 852         return ret;
 853 }
 854
 855 static void gspca_delete(struct kref *kref)
 856 {
 857         struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
 858
 859         PDEBUG(D_STREAM, "device deleted");
 860
 861         kfree(gspca_dev->usb_buf);
 862         kfree(gspca_dev);
 863 }
 864
 865 static int dev_open(struct inode *inode, struct file *file)
 866 {
 867         struct gspca_dev *gspca_dev;
 868         int ret;
 869
 870         PDEBUG(D_STREAM, "%s open", current->comm);
 871         gspca_dev = (struct gspca_dev *) video_devdata(file);
 872         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 873                 return -ERESTARTSYS;
 874         if (!gspca_dev->present) {
 875                 ret = -ENODEV;
 876                 goto out;
 877         }
 878
 879         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 880                 ret = -EBUSY;
 881                 goto out;
 882         }
 883
 884         /* protect the subdriver against rmmod */
 885         if (!try_module_get(gspca_dev->module)) {
 886                 ret = -ENODEV;
 887                 goto out;
 888         }
 889
 890         gspca_dev->users++;
 891
 892         /* one more user */
 893         kref_get(&gspca_dev->kref);
 894
 895         file->private_data = gspca_dev;
 896 #ifdef GSPCA_DEBUG
 897         /* activate the v4l2 debug */
 898         if (gspca_debug & D_V4L2)
 899                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 900                                         | V4L2_DEBUG_IOCTL_ARG;
 901         else
 902                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 903                                         | V4L2_DEBUG_IOCTL_ARG);
 904 #endif
 905         ret = 0;
 906 out:
 907         mutex_unlock(&gspca_dev->queue_lock);
 908         if (ret != 0)
 909                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 910         else
 911                 PDEBUG(D_STREAM, "open done");
 912         return ret;
 913 }
 914
 915 static int dev_close(struct inode *inode, struct file *file)
 916 {
 917         struct gspca_dev *gspca_dev = file->private_data;
 918
 919         PDEBUG(D_STREAM, "%s close", current->comm);
 920         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 921                 return -ERESTARTSYS;
 922         gspca_dev->users--;
 923
 924         /* if the file did the capture, free the streaming resources */
 925         if (gspca_dev->capt_file == file) {
 926                 if (gspca_dev->streaming) {
 927                         mutex_lock(&gspca_dev->usb_lock);
 928                         gspca_stream_off(gspca_dev);
 929                         mutex_unlock(&gspca_dev->usb_lock);
 930                 }
 931                 frame_free(gspca_dev);
 932                 gspca_dev->capt_file = NULL;
 933                 gspca_dev->memory = GSPCA_MEMORY_NO;
 934         }
 935         file->private_data = NULL;
 936         module_put(gspca_dev->module);
 937         mutex_unlock(&gspca_dev->queue_lock);
 938
 939         PDEBUG(D_STREAM, "close done");
 940
 941         kref_put(&gspca_dev->kref, gspca_delete);
 942
 943         return 0;
 944 }
 945
 946 static int vidioc_querycap(struct file *file, void  *priv,
 947                            struct v4l2_capability *cap)
 948 {
 949         struct gspca_dev *gspca_dev = priv;
 950
 951         memset(cap, 0, sizeof *cap);
 952         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 953         if (gspca_dev->dev->product != NULL) {
 954                 strncpy(cap->card, gspca_dev->dev->product,
 955                         sizeof cap->card);
 956         } else {
 957                 snprintf(cap->card, sizeof cap->card,
 958                         "USB Camera (%04x:%04x)",
 959                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 960                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 961         }
 962         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 963                 sizeof cap->bus_info);
 964         cap->version = DRIVER_VERSION_NUMBER;
 965         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 966                           | V4L2_CAP_STREAMING
 967                           | V4L2_CAP_READWRITE;
 968         return 0;
 969 }
 970
 971 static int vidioc_queryctrl(struct file *file, void *priv,
 972                            struct v4l2_queryctrl *q_ctrl)
 973 {
 974         struct gspca_dev *gspca_dev = priv;
 975         int i, ix;
 976         u32 id;
 977
 978         ix = -1;
 979         id = q_ctrl->id;
 980         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 981                 id &= V4L2_CTRL_ID_MASK;
 982                 id++;
 983                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 984                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 985                                 continue;
 986                         if (ix < 0) {
 987                                 ix = i;
 988                                 continue;
 989                         }
 990                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 991                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 992                                 continue;
 993                         ix = i;
 994                 }
 995         }
 996         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 997                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 998                         ix = i;
 999                         break;
1000                 }
1001         }
1002         if (ix < 0)
1003                 return -EINVAL;
1004         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1005                 sizeof *q_ctrl);
1006         if (gspca_dev->ctrl_dis & (1 << ix))
1007                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1008         return 0;
1009 }
1010
1011 static int vidioc_s_ctrl(struct file *file, void *priv,
1012                          struct v4l2_control *ctrl)
1013 {
1014         struct gspca_dev *gspca_dev = priv;
1015         const struct ctrl *ctrls;
1016         int i, ret;
1017
1018         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1019              i < gspca_dev->sd_desc->nctrls;
1020              i++, ctrls++) {
1021                 if (ctrl->id != ctrls->qctrl.id)
1022                         continue;
1023                 if (gspca_dev->ctrl_dis & (1 << i))
1024                         return -EINVAL;
1025                 if (ctrl->value < ctrls->qctrl.minimum
1026                     || ctrl->value > ctrls->qctrl.maximum)
1027                         return -ERANGE;
1028                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1029                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1030                         return -ERESTARTSYS;
1031                 ret = ctrls->set(gspca_dev, ctrl->value);
1032                 mutex_unlock(&gspca_dev->usb_lock);
1033                 return ret;
1034         }
1035         return -EINVAL;
1036 }
1037
1038 static int vidioc_g_ctrl(struct file *file, void *priv,
1039                          struct v4l2_control *ctrl)
1040 {
1041         struct gspca_dev *gspca_dev = priv;
1042
1043         const struct ctrl *ctrls;
1044         int i, ret;
1045
1046         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1047              i < gspca_dev->sd_desc->nctrls;
1048              i++, ctrls++) {
1049                 if (ctrl->id != ctrls->qctrl.id)
1050                         continue;
1051                 if (gspca_dev->ctrl_dis & (1 << i))
1052                         return -EINVAL;
1053                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1054                         return -ERESTARTSYS;
1055                 ret = ctrls->get(gspca_dev, &ctrl->value);
1056                 mutex_unlock(&gspca_dev->usb_lock);
1057                 return ret;
1058         }
1059         return -EINVAL;
1060 }
1061
1062 static int vidioc_querymenu(struct file *file, void *priv,
1063                             struct v4l2_querymenu *qmenu)
1064 {
1065         struct gspca_dev *gspca_dev = priv;
1066
1067         if (!gspca_dev->sd_desc->querymenu)
1068                 return -EINVAL;
1069         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1070 }
1071
1072 static int vidioc_enum_input(struct file *file, void *priv,
1073                                 struct v4l2_input *input)
1074 {
1075         struct gspca_dev *gspca_dev = priv;
1076
1077         if (input->index != 0)
1078                 return -EINVAL;
1079         memset(input, 0, sizeof *input);
1080         input->type = V4L2_INPUT_TYPE_CAMERA;
1081         strncpy(input->name, gspca_dev->sd_desc->name,
1082                 sizeof input->name);
1083         return 0;
1084 }
1085
1086 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1087 {
1088         *i = 0;
1089         return 0;
1090 }
1091
1092 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1093 {
1094         if (i > 0)
1095                 return -EINVAL;
1096         return (0);
1097 }
1098
1099 static int vidioc_reqbufs(struct file *file, void *priv,
1100                           struct v4l2_requestbuffers *rb)
1101 {
1102         struct gspca_dev *gspca_dev = priv;
1103         int i, ret = 0;
1104
1105         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1106                 return -EINVAL;
1107         switch (rb->memory) {
1108         case GSPCA_MEMORY_READ:                 /* (internal call) */
1109         case V4L2_MEMORY_MMAP:
1110         case V4L2_MEMORY_USERPTR:
1111                 break;
1112         default:
1113                 return -EINVAL;
1114         }
1115         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1116                 return -ERESTARTSYS;
1117
1118         if (gspca_dev->memory != GSPCA_MEMORY_NO
1119             && gspca_dev->memory != rb->memory) {
1120                 ret = -EBUSY;
1121                 goto out;
1122         }
1123
1124         /* only one file may do the capture */
1125         if (gspca_dev->capt_file != NULL
1126             && gspca_dev->capt_file != file) {
1127                 ret = -EBUSY;
1128                 goto out;
1129         }
1130
1131         /* if allocated, the buffers must not be mapped */
1132         for (i = 0; i < gspca_dev->nframes; i++) {
1133                 if (gspca_dev->frame[i].vma_use_count) {
1134                         ret = -EBUSY;
1135                         goto out;
1136                 }
1137         }
1138
1139         /* stop streaming */
1140         if (gspca_dev->streaming) {
1141                 mutex_lock(&gspca_dev->usb_lock);
1142                 gspca_stream_off(gspca_dev);
1143                 mutex_unlock(&gspca_dev->usb_lock);
1144         }
1145
1146         /* free the previous allocated buffers, if any */
1147         if (gspca_dev->nframes != 0) {
1148                 frame_free(gspca_dev);
1149                 gspca_dev->capt_file = NULL;
1150         }
1151         if (rb->count == 0)                     /* unrequest */
1152                 goto out;
1153         gspca_dev->memory = rb->memory;
1154         ret = frame_alloc(gspca_dev, rb->count);
1155         if (ret == 0) {
1156                 rb->count = gspca_dev->nframes;
1157                 gspca_dev->capt_file = file;
1158         }
1159 out:
1160         mutex_unlock(&gspca_dev->queue_lock);
1161         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1162         return ret;
1163 }
1164
1165 static int vidioc_querybuf(struct file *file, void *priv,
1166                            struct v4l2_buffer *v4l2_buf)
1167 {
1168         struct gspca_dev *gspca_dev = priv;
1169         struct gspca_frame *frame;
1170
1171         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1172             || v4l2_buf->index < 0
1173             || v4l2_buf->index >= gspca_dev->nframes)
1174                 return -EINVAL;
1175
1176         frame = &gspca_dev->frame[v4l2_buf->index];
1177         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1178         return 0;
1179 }
1180
1181 static int vidioc_streamon(struct file *file, void *priv,
1182                            enum v4l2_buf_type buf_type)
1183 {
1184         struct gspca_dev *gspca_dev = priv;
1185         int ret;
1186
1187         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1188                 return -EINVAL;
1189         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1190                 return -ERESTARTSYS;
1191         if (!gspca_dev->present) {
1192                 ret = -ENODEV;
1193                 goto out;
1194         }
1195         if (gspca_dev->nframes == 0) {
1196                 ret = -EINVAL;
1197                 goto out;
1198         }
1199         if (!gspca_dev->streaming) {
1200                 ret = gspca_init_transfer(gspca_dev);
1201                 if (ret < 0)
1202                         goto out;
1203         }
1204 #ifdef GSPCA_DEBUG
1205         if (gspca_debug & D_STREAM) {
1206                 PDEBUG_MODE("stream on OK",
1207                         gspca_dev->pixfmt,
1208                         gspca_dev->width,
1209                         gspca_dev->height);
1210         }
1211 #endif
1212         ret = 0;
1213 out:
1214         mutex_unlock(&gspca_dev->queue_lock);
1215         return ret;
1216 }
1217
1218 static int vidioc_streamoff(struct file *file, void *priv,
1219                                 enum v4l2_buf_type buf_type)
1220 {
1221         struct gspca_dev *gspca_dev = priv;
1222         int i, ret;
1223
1224         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1225                 return -EINVAL;
1226         if (!gspca_dev->streaming)
1227                 return 0;
1228         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1229                 return -ERESTARTSYS;
1230
1231         /* stop streaming */
1232         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1233                 ret = -ERESTARTSYS;
1234                 goto out;
1235         }
1236         gspca_stream_off(gspca_dev);
1237         mutex_unlock(&gspca_dev->usb_lock);
1238
1239         /* empty the application queues */
1240         for (i = 0; i < gspca_dev->nframes; i++)
1241                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1242         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1243         gspca_dev->last_packet_type = DISCARD_PACKET;
1244         gspca_dev->sequence = 0;
1245         atomic_set(&gspca_dev->nevent, 0);
1246         ret = 0;
1247 out:
1248         mutex_unlock(&gspca_dev->queue_lock);
1249         return ret;
1250 }
1251
1252 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1253                         struct v4l2_jpegcompression *jpegcomp)
1254 {
1255         struct gspca_dev *gspca_dev = priv;
1256         int ret;
1257
1258         if (!gspca_dev->sd_desc->get_jcomp)
1259                 return -EINVAL;
1260         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1261                 return -ERESTARTSYS;
1262         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1263         mutex_unlock(&gspca_dev->usb_lock);
1264         return ret;
1265 }
1266
1267 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1268                         struct v4l2_jpegcompression *jpegcomp)
1269 {
1270         struct gspca_dev *gspca_dev = priv;
1271         int ret;
1272
1273         if (!gspca_dev->sd_desc->set_jcomp)
1274                 return -EINVAL;
1275         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1276                 return -ERESTARTSYS;
1277         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1278         mutex_unlock(&gspca_dev->usb_lock);
1279         return ret;
1280 }
1281
1282 static int vidioc_g_parm(struct file *filp, void *priv,
1283                         struct v4l2_streamparm *parm)
1284 {
1285         struct gspca_dev *gspca_dev = priv;
1286
1287         memset(parm, 0, sizeof *parm);
1288         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1289         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1290         return 0;
1291 }
1292
1293 static int vidioc_s_parm(struct file *filp, void *priv,
1294                         struct v4l2_streamparm *parm)
1295 {
1296         struct gspca_dev *gspca_dev = priv;
1297         int n;
1298
1299         n = parm->parm.capture.readbuffers;
1300         if (n == 0 || n > GSPCA_MAX_FRAMES)
1301                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1302         else
1303                 gspca_dev->nbufread = n;
1304         return 0;
1305 }
1306
1307 static int vidioc_s_std(struct file *filp, void *priv,
1308                         v4l2_std_id *parm)
1309 {
1310         return 0;
1311 }
1312
1313 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1314 static int vidiocgmbuf(struct file *file, void *priv,
1315                         struct video_mbuf *mbuf)
1316 {
1317         struct gspca_dev *gspca_dev = file->private_data;
1318         int i;
1319
1320         PDEBUG(D_STREAM, "cgmbuf");
1321         if (gspca_dev->nframes == 0) {
1322                 int ret;
1323
1324                 {
1325                         struct v4l2_format fmt;
1326
1327                         memset(&fmt, 0, sizeof fmt);
1328                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1329                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1330                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1331                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1332                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1333                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1334                         if (ret != 0)
1335                                 return ret;
1336                 }
1337                 {
1338                         struct v4l2_requestbuffers rb;
1339
1340                         memset(&rb, 0, sizeof rb);
1341                         rb.count = 4;
1342                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1343                         rb.memory = V4L2_MEMORY_MMAP;
1344                         ret = vidioc_reqbufs(file, priv, &rb);
1345                         if (ret != 0)
1346                                 return ret;
1347                 }
1348         }
1349         mbuf->frames = gspca_dev->nframes;
1350         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1351         for (i = 0; i < mbuf->frames; i++)
1352                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1353         return 0;
1354 }
1355 #endif
1356
1357 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1358 {
1359         struct gspca_dev *gspca_dev = file->private_data;
1360         struct gspca_frame *frame;
1361         struct page *page;
1362         unsigned long addr, start, size;
1363         int i, ret;
1364
1365         start = vma->vm_start;
1366         size = vma->vm_end - vma->vm_start;
1367         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1368
1369         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1370                 return -ERESTARTSYS;
1371         if (!gspca_dev->present) {
1372                 ret = -ENODEV;
1373                 goto out;
1374         }
1375         if (gspca_dev->capt_file != file) {
1376                 ret = -EINVAL;
1377                 goto out;
1378         }
1379
1380         frame = NULL;
1381         for (i = 0; i < gspca_dev->nframes; ++i) {
1382                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1383                         PDEBUG(D_STREAM, "mmap bad memory type");
1384                         break;
1385                 }
1386                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1387                                                 == vma->vm_pgoff) {
1388                         frame = &gspca_dev->frame[i];
1389                         break;
1390                 }
1391         }
1392         if (frame == NULL) {
1393                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1394                 ret = -EINVAL;
1395                 goto out;
1396         }
1397 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1398         /* v4l1 maps all the buffers */
1399         if (i != 0
1400             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1401 #endif
1402             if (size != frame->v4l2_buf.length) {
1403                 PDEBUG(D_STREAM, "mmap bad size");
1404                 ret = -EINVAL;
1405                 goto out;
1406         }
1407
1408         /*
1409          * - VM_IO marks the area as being a mmaped region for I/O to a
1410          *   device. It also prevents the region from being core dumped.
1411          */
1412         vma->vm_flags |= VM_IO;
1413
1414         addr = (unsigned long) frame->data;
1415         while (size > 0) {
1416                 page = vmalloc_to_page((void *) addr);
1417                 ret = vm_insert_page(vma, start, page);
1418                 if (ret < 0)
1419                         goto out;
1420                 start += PAGE_SIZE;
1421                 addr += PAGE_SIZE;
1422                 size -= PAGE_SIZE;
1423         }
1424
1425         vma->vm_ops = &gspca_vm_ops;
1426         vma->vm_private_data = frame;
1427         gspca_vm_open(vma);
1428         ret = 0;
1429 out:
1430         mutex_unlock(&gspca_dev->queue_lock);
1431         return ret;
1432 }
1433
1434 /*
1435  * wait for a video frame
1436  *
1437  * If a frame is ready, its index is returned.
1438  */
1439 static int frame_wait(struct gspca_dev *gspca_dev,
1440                         int nonblock_ing)
1441 {
1442         struct gspca_frame *frame;
1443         int i, j, ret;
1444
1445         /* check if a frame is ready */
1446         i = gspca_dev->fr_o;
1447         j = gspca_dev->fr_queue[i];
1448         frame = &gspca_dev->frame[j];
1449         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1450                 atomic_dec(&gspca_dev->nevent);
1451                 goto ok;
1452         }
1453         if (nonblock_ing)                       /* no frame yet */
1454                 return -EAGAIN;
1455
1456         /* wait till a frame is ready */
1457         for (;;) {
1458                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1459                                         atomic_read(&gspca_dev->nevent) > 0,
1460                                         msecs_to_jiffies(3000));
1461                 if (ret <= 0) {
1462                         if (ret < 0)
1463                                 return ret;     /* interrupt */
1464                         return -EIO;            /* timeout */
1465                 }
1466                 atomic_dec(&gspca_dev->nevent);
1467                 if (!gspca_dev->streaming || !gspca_dev->present)
1468                         return -EIO;
1469                 i = gspca_dev->fr_o;
1470                 j = gspca_dev->fr_queue[i];
1471                 frame = &gspca_dev->frame[j];
1472                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1473                         break;
1474         }
1475 ok:
1476         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1477         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1478                 gspca_dev->fr_q,
1479                 gspca_dev->fr_i,
1480                 gspca_dev->fr_o);
1481
1482         if (gspca_dev->sd_desc->dq_callback) {
1483                 mutex_lock(&gspca_dev->usb_lock);
1484                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1485                 mutex_unlock(&gspca_dev->usb_lock);
1486         }
1487         return j;
1488 }
1489
1490 /*
1491  * dequeue a video buffer
1492  *
1493  * If nonblock_ing is false, block until a buffer is available.
1494  */
1495 static int vidioc_dqbuf(struct file *file, void *priv,
1496                         struct v4l2_buffer *v4l2_buf)
1497 {
1498         struct gspca_dev *gspca_dev = priv;
1499         struct gspca_frame *frame;
1500         int i, ret;
1501
1502         PDEBUG(D_FRAM, "dqbuf");
1503         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1504                 return -EINVAL;
1505         if (v4l2_buf->memory != gspca_dev->memory)
1506                 return -EINVAL;
1507
1508         /* if not streaming, be sure the application will not loop forever */
1509         if (!(file->f_flags & O_NONBLOCK)
1510             && !gspca_dev->streaming && gspca_dev->users == 1)
1511                 return -EINVAL;
1512
1513         /* only the capturing file may dequeue */
1514         if (gspca_dev->capt_file != file)
1515                 return -EINVAL;
1516
1517         /* only one dequeue / read at a time */
1518         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1519                 return -ERESTARTSYS;
1520
1521         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1522         if (ret < 0)
1523                 goto out;
1524         i = ret;                                /* frame index */
1525         frame = &gspca_dev->frame[i];
1526         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1527                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1528                                  frame->data,
1529                                  frame->v4l2_buf.bytesused)) {
1530                         PDEBUG(D_ERR|D_STREAM,
1531                                 "dqbuf cp to user failed");
1532                         ret = -EFAULT;
1533                         goto out;
1534                 }
1535         }
1536         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1537         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1538         PDEBUG(D_FRAM, "dqbuf %d", i);
1539         ret = 0;
1540 out:
1541         mutex_unlock(&gspca_dev->read_lock);
1542         return ret;
1543 }
1544
1545 /*
1546  * queue a video buffer
1547  *
1548  * Attempting to queue a buffer that has already been
1549  * queued will return -EINVAL.
1550  */
1551 static int vidioc_qbuf(struct file *file, void *priv,
1552                         struct v4l2_buffer *v4l2_buf)
1553 {
1554         struct gspca_dev *gspca_dev = priv;
1555         struct gspca_frame *frame;
1556         int i, index, ret;
1557
1558         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1559         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1560                 return -EINVAL;
1561
1562         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1563                 return -ERESTARTSYS;
1564
1565         index = v4l2_buf->index;
1566         if ((unsigned) index >= gspca_dev->nframes) {
1567                 PDEBUG(D_FRAM,
1568                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1569                 ret = -EINVAL;
1570                 goto out;
1571         }
1572         if (v4l2_buf->memory != gspca_dev->memory) {
1573                 PDEBUG(D_FRAM, "qbuf bad memory type");
1574                 ret = -EINVAL;
1575                 goto out;
1576         }
1577
1578         frame = &gspca_dev->frame[index];
1579         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1580                 PDEBUG(D_FRAM, "qbuf bad state");
1581                 ret = -EINVAL;
1582                 goto out;
1583         }
1584
1585         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1586
1587         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1588                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1589                 frame->v4l2_buf.length = v4l2_buf->length;
1590         }
1591
1592         /* put the buffer in the 'queued' queue */
1593         i = gspca_dev->fr_q;
1594         gspca_dev->fr_queue[i] = index;
1595         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1596         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1597                 gspca_dev->fr_q,
1598                 gspca_dev->fr_i,
1599                 gspca_dev->fr_o);
1600
1601         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1602         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1603         ret = 0;
1604 out:
1605         mutex_unlock(&gspca_dev->queue_lock);
1606         return ret;
1607 }
1608
1609 /*
1610  * allocate the resources for read()
1611  */
1612 static int read_alloc(struct gspca_dev *gspca_dev,
1613                         struct file *file)
1614 {
1615         struct v4l2_buffer v4l2_buf;
1616         int i, ret;
1617
1618         PDEBUG(D_STREAM, "read alloc");
1619         if (gspca_dev->nframes == 0) {
1620                 struct v4l2_requestbuffers rb;
1621
1622                 memset(&rb, 0, sizeof rb);
1623                 rb.count = gspca_dev->nbufread;
1624                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1625                 rb.memory = GSPCA_MEMORY_READ;
1626                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1627                 if (ret != 0) {
1628                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1629                         return ret;
1630                 }
1631                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1632                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1633                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1634                 for (i = 0; i < gspca_dev->nbufread; i++) {
1635                         v4l2_buf.index = i;
1636                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1637                         if (ret != 0) {
1638                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1639                                 return ret;
1640                         }
1641                 }
1642                 gspca_dev->memory = GSPCA_MEMORY_READ;
1643         }
1644
1645         /* start streaming */
1646         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1647         if (ret != 0)
1648                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1649         return ret;
1650 }
1651
1652 static unsigned int dev_poll(struct file *file, poll_table *wait)
1653 {
1654         struct gspca_dev *gspca_dev = file->private_data;
1655         int i, ret;
1656
1657         PDEBUG(D_FRAM, "poll");
1658
1659         poll_wait(file, &gspca_dev->wq, wait);
1660         if (!gspca_dev->present)
1661                 return POLLERR;
1662
1663         /* if reqbufs is not done, the user would use read() */
1664         if (gspca_dev->nframes == 0) {
1665                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1666                         return POLLERR;         /* not the 1st time */
1667                 ret = read_alloc(gspca_dev, file);
1668                 if (ret != 0)
1669                         return POLLERR;
1670         }
1671
1672         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1673                 return POLLERR;
1674         if (!gspca_dev->present) {
1675                 ret = POLLERR;
1676                 goto out;
1677         }
1678
1679         /* check the next incoming buffer */
1680         i = gspca_dev->fr_o;
1681         i = gspca_dev->fr_queue[i];
1682         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1683                 ret = POLLIN | POLLRDNORM;      /* something to read */
1684         else
1685                 ret = 0;
1686 out:
1687         mutex_unlock(&gspca_dev->queue_lock);
1688         return ret;
1689 }
1690
1691 static ssize_t dev_read(struct file *file, char __user *data,
1692                     size_t count, loff_t *ppos)
1693 {
1694         struct gspca_dev *gspca_dev = file->private_data;
1695         struct gspca_frame *frame;
1696         struct v4l2_buffer v4l2_buf;
1697         struct timeval timestamp;
1698         int n, ret, ret2;
1699
1700         PDEBUG(D_FRAM, "read (%zd)", count);
1701         if (!gspca_dev->present)
1702                 return -ENODEV;
1703         switch (gspca_dev->memory) {
1704         case GSPCA_MEMORY_NO:                   /* first time */
1705                 ret = read_alloc(gspca_dev, file);
1706                 if (ret != 0)
1707                         return ret;
1708                 break;
1709         case GSPCA_MEMORY_READ:
1710                 if (gspca_dev->capt_file == file)
1711                         break;
1712                 /* fall thru */
1713         default:
1714                 return -EINVAL;
1715         }
1716
1717         /* get a frame */
1718         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1719         timestamp.tv_sec--;
1720         n = 2;
1721         for (;;) {
1722                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1723                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1724                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1725                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1726                 if (ret != 0) {
1727                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1728                         return ret;
1729                 }
1730
1731                 /* if the process slept for more than 1 second,
1732                  * get a newer frame */
1733                 frame = &gspca_dev->frame[v4l2_buf.index];
1734                 if (--n < 0)
1735                         break;                  /* avoid infinite loop */
1736                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1737                         break;
1738                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1739                 if (ret != 0) {
1740                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1741                         return ret;
1742                 }
1743         }
1744
1745         /* copy the frame */
1746         if (count > frame->v4l2_buf.bytesused)
1747                 count = frame->v4l2_buf.bytesused;
1748         ret = copy_to_user(data, frame->data, count);
1749         if (ret != 0) {
1750                 PDEBUG(D_ERR|D_STREAM,
1751                         "read cp to user lack %d / %zd", ret, count);
1752                 ret = -EFAULT;
1753                 goto out;
1754         }
1755         ret = count;
1756 out:
1757         /* in each case, requeue the buffer */
1758         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1759         if (ret2 != 0)
1760                 return ret2;
1761         return ret;
1762 }
1763
1764 static struct file_operations dev_fops = {
1765         .owner = THIS_MODULE,
1766         .open = dev_open,
1767         .release = dev_close,
1768         .read = dev_read,
1769         .mmap = dev_mmap,
1770         .ioctl = video_ioctl2,
1771 #ifdef CONFIG_COMPAT
1772         .compat_ioctl = v4l_compat_ioctl32,
1773 #endif
1774         .llseek = no_llseek,
1775         .poll   = dev_poll,
1776 };
1777
1778 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1779         .vidioc_querycap        = vidioc_querycap,
1780         .vidioc_dqbuf           = vidioc_dqbuf,
1781         .vidioc_qbuf            = vidioc_qbuf,
1782         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1783         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1784         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1785         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1786         .vidioc_streamon        = vidioc_streamon,
1787         .vidioc_queryctrl       = vidioc_queryctrl,
1788         .vidioc_g_ctrl          = vidioc_g_ctrl,
1789         .vidioc_s_ctrl          = vidioc_s_ctrl,
1790         .vidioc_querymenu       = vidioc_querymenu,
1791         .vidioc_enum_input      = vidioc_enum_input,
1792         .vidioc_g_input         = vidioc_g_input,
1793         .vidioc_s_input         = vidioc_s_input,
1794         .vidioc_reqbufs         = vidioc_reqbufs,
1795         .vidioc_querybuf        = vidioc_querybuf,
1796         .vidioc_streamoff       = vidioc_streamoff,
1797         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1798         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1799         .vidioc_g_parm          = vidioc_g_parm,
1800         .vidioc_s_parm          = vidioc_s_parm,
1801         .vidioc_s_std           = vidioc_s_std,
1802 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1803         .vidiocgmbuf          = vidiocgmbuf,
1804 #endif
1805 };
1806
1807 static struct video_device gspca_template = {
1808         .name = "gspca main driver",
1809         .fops = &dev_fops,
1810         .ioctl_ops = &dev_ioctl_ops,
1811         .release = video_device_release,
1812         .minor = -1,
1813 };
1814
1815 /*
1816  * probe and create a new gspca device
1817  *
1818  * This function must be called by the sub-driver when it is
1819  * called for probing a new device.
1820  */
1821 int gspca_dev_probe(struct usb_interface *intf,
1822                 const struct usb_device_id *id,
1823                 const struct sd_desc *sd_desc,
1824                 int dev_size,
1825                 struct module *module)
1826 {
1827         struct usb_interface_descriptor *interface;
1828         struct gspca_dev *gspca_dev;
1829         struct usb_device *dev = interface_to_usbdev(intf);
1830         int ret;
1831
1832         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1833
1834         /* we don't handle multi-config cameras */
1835         if (dev->descriptor.bNumConfigurations != 1)
1836                 return -ENODEV;
1837         interface = &intf->cur_altsetting->desc;
1838         if (interface->bInterfaceNumber > 0)
1839                 return -ENODEV;
1840
1841         /* create the device */
1842         if (dev_size < sizeof *gspca_dev)
1843                 dev_size = sizeof *gspca_dev;
1844         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1845         if (!gspca_dev) {
1846                 err("couldn't kzalloc gspca struct");
1847                 return -ENOMEM;
1848         }
1849         kref_init(&gspca_dev->kref);
1850         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1851         if (!gspca_dev->usb_buf) {
1852                 err("out of memory");
1853                 ret = -ENOMEM;
1854                 goto out;
1855         }
1856         gspca_dev->dev = dev;
1857         gspca_dev->iface = interface->bInterfaceNumber;
1858         gspca_dev->nbalt = intf->num_altsetting;
1859         gspca_dev->sd_desc = sd_desc;
1860         gspca_dev->nbufread = 2;
1861
1862         /* configure the subdriver and initialize the USB device */
1863         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1864         if (ret < 0)
1865                 goto out;
1866         ret = gspca_dev->sd_desc->init(gspca_dev);
1867         if (ret < 0)
1868                 goto out;
1869         ret = gspca_set_alt0(gspca_dev);
1870         if (ret < 0)
1871                 goto out;
1872         gspca_set_default_mode(gspca_dev);
1873
1874         mutex_init(&gspca_dev->usb_lock);
1875         mutex_init(&gspca_dev->read_lock);
1876         mutex_init(&gspca_dev->queue_lock);
1877         init_waitqueue_head(&gspca_dev->wq);
1878
1879         /* init video stuff */
1880         gspca_dev->vdev = video_device_alloc();
1881         memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1882         gspca_dev->vdev->parent = &dev->dev;
1883         gspca_dev->module = module;
1884         gspca_dev->present = 1;
1885         ret = video_register_device(&gspca_dev->vdev,
1886                                   VFL_TYPE_GRABBER,
1887                                   video_nr);
1888         if (ret < 0) {
1889                 err("video_register_device err %d", ret);
1890                 goto out;
1891         }
1892
1893         usb_set_intfdata(intf, gspca_dev);
1894         PDEBUG(D_PROBE, "probe ok");
1895         return 0;
1896 out:
1897         kfree(gspca_dev->usb_buf);
1898         kfree(gspca_dev);
1899         return ret;
1900 }
1901 EXPORT_SYMBOL(gspca_dev_probe);
1902
1903 /*
1904  * USB disconnection
1905  *
1906  * This function must be called by the sub-driver
1907  * when the device disconnects, after the specific resources are freed.
1908  */
1909 void gspca_disconnect(struct usb_interface *intf)
1910 {
1911         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1912
1913         usb_set_intfdata(intf, NULL);
1914
1915         /* release the device */
1916         /* (this will call gspca_release() immediatly or on last close) */
1917         video_unregister_device(&gspca_dev->vdev);
1918
1919         kref_put(&gspca_dev->kref, gspca_delete);
1920
1921         PDEBUG(D_PROBE, "disconnect complete");
1922 }
1923 EXPORT_SYMBOL(gspca_disconnect);
1924
1925 #ifdef CONFIG_PM
1926 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1927 {
1928         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1929
1930         if (!gspca_dev->streaming)
1931                 return 0;
1932         gspca_dev->frozen = 1;          /* avoid urb error messages */
1933         if (gspca_dev->sd_desc->stopN)
1934                 gspca_dev->sd_desc->stopN(gspca_dev);
1935         destroy_urbs(gspca_dev);
1936         gspca_set_alt0(gspca_dev);
1937         if (gspca_dev->sd_desc->stop0)
1938                 gspca_dev->sd_desc->stop0(gspca_dev);
1939         return 0;
1940 }
1941 EXPORT_SYMBOL(gspca_suspend);
1942
1943 int gspca_resume(struct usb_interface *intf)
1944 {
1945         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1946
1947         gspca_dev->frozen = 0;
1948         gspca_dev->sd_desc->init(gspca_dev);
1949         if (gspca_dev->streaming)
1950                 return gspca_init_transfer(gspca_dev);
1951         return 0;
1952 }
1953 EXPORT_SYMBOL(gspca_resume);
1954 #endif
1955 /* -- cam driver utility functions -- */
1956
1957 /* auto gain and exposure algorithm based on the knee algorithm described here:
1958    http://ytse.tricolour.net/docs/LowLightOptimization.html
1959
1960    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1961    where changed. */
1962 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1963         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1964 {
1965         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1966         const struct ctrl *gain_ctrl = NULL;
1967         const struct ctrl *exposure_ctrl = NULL;
1968         const struct ctrl *autogain_ctrl = NULL;
1969         int retval = 0;
1970
1971         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1972                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1973                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1974                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1975                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1977                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1978         }
1979         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1980                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1981                         "on cam without (auto)gain/exposure");
1982                 return 0;
1983         }
1984
1985         if (gain_ctrl->get(gspca_dev, &gain) ||
1986                         exposure_ctrl->get(gspca_dev, &exposure) ||
1987                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1988                 return 0;
1989
1990         orig_gain = gain;
1991         orig_exposure = exposure;
1992
1993         /* If we are of a multiple of deadzone, do multiple steps to reach the
1994            desired lumination fast (with the risc of a slight overshoot) */
1995         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1996
1997         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1998                 avg_lum, desired_avg_lum, steps);
1999
2000         for (i = 0; i < steps; i++) {
2001                 if (avg_lum > desired_avg_lum) {
2002                         if (gain > gain_knee)
2003                                 gain--;
2004                         else if (exposure > exposure_knee)
2005                                 exposure--;
2006                         else if (gain > gain_ctrl->qctrl.default_value)
2007                                 gain--;
2008                         else if (exposure > exposure_ctrl->qctrl.minimum)
2009                                 exposure--;
2010                         else if (gain > gain_ctrl->qctrl.minimum)
2011                                 gain--;
2012                         else
2013                                 break;
2014                 } else {
2015                         if (gain < gain_ctrl->qctrl.default_value)
2016                                 gain++;
2017                         else if (exposure < exposure_knee)
2018                                 exposure++;
2019                         else if (gain < gain_knee)
2020                                 gain++;
2021                         else if (exposure < exposure_ctrl->qctrl.maximum)
2022                                 exposure++;
2023                         else if (gain < gain_ctrl->qctrl.maximum)
2024                                 gain++;
2025                         else
2026                                 break;
2027                 }
2028         }
2029
2030         if (gain != orig_gain) {
2031                 gain_ctrl->set(gspca_dev, gain);
2032                 retval = 1;
2033         }
2034         if (exposure != orig_exposure) {
2035                 exposure_ctrl->set(gspca_dev, exposure);
2036                 retval = 1;
2037         }
2038
2039         return retval;
2040 }
2041 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2042
2043 /* -- module insert / remove -- */
2044 static int __init gspca_init(void)
2045 {
2046         info("main v%d.%d.%d registered",
2047                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2048                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2049                 DRIVER_VERSION_NUMBER & 0xff);
2050         return 0;
2051 }
2052 static void __exit gspca_exit(void)
2053 {
2054         info("main deregistered");
2055 }
2056
2057 module_init(gspca_init);
2058 module_exit(gspca_exit);
2059
2060 #ifdef GSPCA_DEBUG
2061 module_param_named(debug, gspca_debug, int, 0644);
2062 MODULE_PARM_DESC(debug,
2063                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2064                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2065                 " 0x0100: v4l2");
2066 #endif