git.oblomov.eu Git - linux-2.6/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 <asm/page.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/jiffies.h>
  36 #include <media/v4l2-ioctl.h>
  37
  38 #include "gspca.h"
  39
  40 /* global values */
  41 #define DEF_NURBS 2             /* default number of URBs */
  42
  43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  45 MODULE_LICENSE("GPL");
  46
  47 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 4, 0)
  48
  49 static int video_nr = -1;
  50
  51 #ifdef GSPCA_DEBUG
  52 int gspca_debug = D_ERR | D_PROBE;
  53 EXPORT_SYMBOL(gspca_debug);
  54
  55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  56 {
  57         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  58                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  59                         txt,
  60                         pixfmt & 0xff,
  61                         (pixfmt >> 8) & 0xff,
  62                         (pixfmt >> 16) & 0xff,
  63                         pixfmt >> 24,
  64                         w, h);
  65         } else {
  66                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  67                         txt,
  68                         pixfmt,
  69                         w, h);
  70         }
  71 }
  72 #else
  73 #define PDEBUG_MODE(txt, pixfmt, w, h)
  74 #endif
  75
  76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  77 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  78 #define GSPCA_MEMORY_READ 7
  79
  80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  81
  82 /*
  83  * VMA operations.
  84  */
  85 static void gspca_vm_open(struct vm_area_struct *vma)
  86 {
  87         struct gspca_frame *frame = vma->vm_private_data;
  88
  89         frame->vma_use_count++;
  90         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  91 }
  92
  93 static void gspca_vm_close(struct vm_area_struct *vma)
  94 {
  95         struct gspca_frame *frame = vma->vm_private_data;
  96
  97         if (--frame->vma_use_count <= 0)
  98                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  99 }
 100
 101 static struct vm_operations_struct gspca_vm_ops = {
 102         .open           = gspca_vm_open,
 103         .close          = gspca_vm_close,
 104 };
 105
 106 /* get the current input frame buffer */
 107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 108 {
 109         struct gspca_frame *frame;
 110         int i;
 111
 112         i = gspca_dev->fr_i;
 113         i = gspca_dev->fr_queue[i];
 114         frame = &gspca_dev->frame[i];
 115         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 116                                 != V4L2_BUF_FLAG_QUEUED)
 117                 return NULL;
 118         return frame;
 119 }
 120 EXPORT_SYMBOL(gspca_get_i_frame);
 121
 122 /*
 123  * fill a video frame from an URB and resubmit
 124  */
 125 static void fill_frame(struct gspca_dev *gspca_dev,
 126                         struct urb *urb)
 127 {
 128         struct gspca_frame *frame;
 129         __u8 *data;             /* address of data in the iso message */
 130         int i, len, st;
 131         cam_pkt_op pkt_scan;
 132
 133         if (urb->status != 0) {
 134 #ifdef CONFIG_PM
 135                 if (!gspca_dev->frozen)
 136 #endif
 137                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 138                 return;         /* disconnection ? */
 139         }
 140         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 141         for (i = 0; i < urb->number_of_packets; i++) {
 142
 143                 /* check the availability of the frame buffer */
 144                 frame = gspca_get_i_frame(gspca_dev);
 145                 if (!frame) {
 146                         gspca_dev->last_packet_type = DISCARD_PACKET;
 147                         break;
 148                 }
 149
 150                 /* check the packet status and length */
 151                 len = urb->iso_frame_desc[i].actual_length;
 152                 if (len == 0) {
 153                         if (gspca_dev->empty_packet == 0)
 154                                 gspca_dev->empty_packet = 1;
 155                         continue;
 156                 }
 157                 st = urb->iso_frame_desc[i].status;
 158                 if (st) {
 159                         PDEBUG(D_ERR,
 160                                 "ISOC data error: [%d] len=%d, status=%d",
 161                                 i, len, st);
 162                         gspca_dev->last_packet_type = DISCARD_PACKET;
 163                         continue;
 164                 }
 165
 166                 /* let the packet be analyzed by the subdriver */
 167                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 168                         i, urb->iso_frame_desc[i].offset, len);
 169                 data = (__u8 *) urb->transfer_buffer
 170                                         + urb->iso_frame_desc[i].offset;
 171                 pkt_scan(gspca_dev, frame, data, len);
 172         }
 173
 174         /* resubmit the URB */
 175         st = usb_submit_urb(urb, GFP_ATOMIC);
 176         if (st < 0)
 177                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 178 }
 179
 180 /*
 181  * ISOC message interrupt from the USB device
 182  *
 183  * Analyse each packet and call the subdriver for copy to the frame buffer.
 184  */
 185 static void isoc_irq(struct urb *urb
 186 )
 187 {
 188         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 189
 190         PDEBUG(D_PACK, "isoc irq");
 191         if (!gspca_dev->streaming)
 192                 return;
 193         fill_frame(gspca_dev, urb);
 194 }
 195
 196 /*
 197  * bulk message interrupt from the USB device
 198  */
 199 static void bulk_irq(struct urb *urb
 200 )
 201 {
 202         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 203         struct gspca_frame *frame;
 204         int st;
 205
 206         PDEBUG(D_PACK, "bulk irq");
 207         if (!gspca_dev->streaming)
 208                 return;
 209         switch (urb->status) {
 210         case 0:
 211                 break;
 212         case -ECONNRESET:
 213                 urb->status = 0;
 214                 break;
 215         default:
 216 #ifdef CONFIG_PM
 217                 if (!gspca_dev->frozen)
 218 #endif
 219                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 220                 return;         /* disconnection ? */
 221         }
 222
 223         /* check the availability of the frame buffer */
 224         frame = gspca_get_i_frame(gspca_dev);
 225         if (!frame) {
 226                 gspca_dev->last_packet_type = DISCARD_PACKET;
 227         } else {
 228                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 229                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 230                                         frame,
 231                                         urb->transfer_buffer,
 232                                         urb->actual_length);
 233         }
 234
 235         /* resubmit the URB */
 236         if (gspca_dev->cam.bulk_nurbs != 0) {
 237                 st = usb_submit_urb(urb, GFP_ATOMIC);
 238                 if (st < 0)
 239                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 240         }
 241 }
 242
 243 /*
 244  * add data to the current frame
 245  *
 246  * This function is called by the subdrivers at interrupt level.
 247  *
 248  * To build a frame, these ones must add
 249  *      - one FIRST_PACKET
 250  *      - 0 or many INTER_PACKETs
 251  *      - one LAST_PACKET
 252  * DISCARD_PACKET invalidates the whole frame.
 253  * On LAST_PACKET, a new frame is returned.
 254  */
 255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 256                                     enum gspca_packet_type packet_type,
 257                                     struct gspca_frame *frame,
 258                                     const __u8 *data,
 259                                     int len)
 260 {
 261         int i, j;
 262
 263         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 264
 265         /* when start of a new frame, if the current frame buffer
 266          * is not queued, discard the whole frame */
 267         if (packet_type == FIRST_PACKET) {
 268                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 269                                                 != V4L2_BUF_FLAG_QUEUED) {
 270                         gspca_dev->last_packet_type = DISCARD_PACKET;
 271                         return frame;
 272                 }
 273                 frame->data_end = frame->data;
 274                 jiffies_to_timeval(get_jiffies_64(),
 275                                    &frame->v4l2_buf.timestamp);
 276                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 277         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 278                 if (packet_type == LAST_PACKET)
 279                         gspca_dev->last_packet_type = packet_type;
 280                 return frame;
 281         }
 282
 283         /* append the packet to the frame buffer */
 284         if (len > 0) {
 285                 if (frame->data_end - frame->data + len
 286                                                  > frame->v4l2_buf.length) {
 287                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 288                                 frame->data_end - frame->data + len,
 289                                 frame->v4l2_buf.length);
 290                         packet_type = DISCARD_PACKET;
 291                 } else {
 292                         memcpy(frame->data_end, data, len);
 293                         frame->data_end += len;
 294                 }
 295         }
 296         gspca_dev->last_packet_type = packet_type;
 297
 298         /* if last packet, wake up the application and advance in the queue */
 299         if (packet_type == LAST_PACKET) {
 300                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 301                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 302                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 303                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 304                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 305                 gspca_dev->fr_i = i;
 306                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 307                         frame->v4l2_buf.bytesused,
 308                         gspca_dev->fr_q,
 309                         i,
 310                         gspca_dev->fr_o);
 311                 j = gspca_dev->fr_queue[i];
 312                 frame = &gspca_dev->frame[j];
 313         }
 314         return frame;
 315 }
 316 EXPORT_SYMBOL(gspca_frame_add);
 317
 318 static int gspca_is_compressed(__u32 format)
 319 {
 320         switch (format) {
 321         case V4L2_PIX_FMT_MJPEG:
 322         case V4L2_PIX_FMT_JPEG:
 323         case V4L2_PIX_FMT_SPCA561:
 324         case V4L2_PIX_FMT_PAC207:
 325                 return 1;
 326         }
 327         return 0;
 328 }
 329
 330 static void *rvmalloc(unsigned long size)
 331 {
 332         void *mem;
 333         unsigned long adr;
 334
 335         mem = vmalloc_32(size);
 336         if (mem != NULL) {
 337                 adr = (unsigned long) mem;
 338                 while ((long) size > 0) {
 339                         SetPageReserved(vmalloc_to_page((void *) adr));
 340                         adr += PAGE_SIZE;
 341                         size -= PAGE_SIZE;
 342                 }
 343         }
 344         return mem;
 345 }
 346
 347 static void rvfree(void *mem, long size)
 348 {
 349         unsigned long adr;
 350
 351         adr = (unsigned long) mem;
 352         while (size > 0) {
 353                 ClearPageReserved(vmalloc_to_page((void *) adr));
 354                 adr += PAGE_SIZE;
 355                 size -= PAGE_SIZE;
 356         }
 357         vfree(mem);
 358 }
 359
 360 static int frame_alloc(struct gspca_dev *gspca_dev,
 361                         unsigned int count)
 362 {
 363         struct gspca_frame *frame;
 364         unsigned int frsz;
 365         int i;
 366
 367         i = gspca_dev->curr_mode;
 368         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 369         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 370         frsz = PAGE_ALIGN(frsz);
 371         gspca_dev->frsz = frsz;
 372         if (count > GSPCA_MAX_FRAMES)
 373                 count = GSPCA_MAX_FRAMES;
 374         gspca_dev->frbuf = rvmalloc(frsz * count);
 375         if (!gspca_dev->frbuf) {
 376                 err("frame alloc failed");
 377                 return -ENOMEM;
 378         }
 379         gspca_dev->nframes = count;
 380         for (i = 0; i < count; i++) {
 381                 frame = &gspca_dev->frame[i];
 382                 frame->v4l2_buf.index = i;
 383                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 384                 frame->v4l2_buf.flags = 0;
 385                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 386                 frame->v4l2_buf.length = frsz;
 387                 frame->v4l2_buf.memory = gspca_dev->memory;
 388                 frame->v4l2_buf.sequence = 0;
 389                 frame->data = frame->data_end =
 390                                         gspca_dev->frbuf + i * frsz;
 391                 frame->v4l2_buf.m.offset = i * frsz;
 392         }
 393         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 394         gspca_dev->last_packet_type = DISCARD_PACKET;
 395         gspca_dev->sequence = 0;
 396         return 0;
 397 }
 398
 399 static void frame_free(struct gspca_dev *gspca_dev)
 400 {
 401         int i;
 402
 403         PDEBUG(D_STREAM, "frame free");
 404         if (gspca_dev->frbuf != NULL) {
 405                 rvfree(gspca_dev->frbuf,
 406                         gspca_dev->nframes * gspca_dev->frsz);
 407                 gspca_dev->frbuf = NULL;
 408                 for (i = 0; i < gspca_dev->nframes; i++)
 409                         gspca_dev->frame[i].data = NULL;
 410         }
 411         gspca_dev->nframes = 0;
 412 }
 413
 414 static void destroy_urbs(struct gspca_dev *gspca_dev)
 415 {
 416         struct urb *urb;
 417         unsigned int i;
 418
 419         PDEBUG(D_STREAM, "kill transfer");
 420         for (i = 0; i < MAX_NURBS; i++) {
 421                 urb = gspca_dev->urb[i];
 422                 if (urb == NULL)
 423                         break;
 424
 425                 gspca_dev->urb[i] = NULL;
 426                 usb_kill_urb(urb);
 427                 if (urb->transfer_buffer != NULL)
 428                         usb_buffer_free(gspca_dev->dev,
 429                                         urb->transfer_buffer_length,
 430                                         urb->transfer_buffer,
 431                                         urb->transfer_dma);
 432                 usb_free_urb(urb);
 433         }
 434 }
 435
 436 /*
 437  * look for an input transfer endpoint in an alternate setting
 438  */
 439 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 440                                           __u8 epaddr,
 441                                           __u8 xfer)
 442 {
 443         struct usb_host_endpoint *ep;
 444         int i, attr;
 445
 446         epaddr |= USB_DIR_IN;
 447         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 448                 ep = &alt->endpoint[i];
 449                 if (ep->desc.bEndpointAddress == epaddr) {
 450                         attr = ep->desc.bmAttributes
 451                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 452                         if (attr == xfer)
 453                                 return ep;
 454                         break;
 455                 }
 456         }
 457         return NULL;
 458 }
 459
 460 /*
 461  * look for an input (isoc or bulk) endpoint
 462  *
 463  * The endpoint is defined by the subdriver.
 464  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 465  * This routine may be called many times when the bandwidth is too small
 466  * (the bandwidth is checked on urb submit).
 467  */
 468 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 469 {
 470         struct usb_interface *intf;
 471         struct usb_host_endpoint *ep;
 472         int i, ret;
 473
 474         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 475         ep = NULL;
 476         i = gspca_dev->alt;                     /* previous alt setting */
 477
 478         /* try isoc */
 479         while (--i > 0) {                       /* alt 0 is unusable */
 480                 ep = alt_xfer(&intf->altsetting[i],
 481                                 gspca_dev->cam.epaddr,
 482                                 USB_ENDPOINT_XFER_ISOC);
 483                 if (ep)
 484                         break;
 485         }
 486
 487         /* if no isoc, try bulk */
 488         if (ep == NULL) {
 489                 ep = alt_xfer(&intf->altsetting[0],
 490                                 gspca_dev->cam.epaddr,
 491                                 USB_ENDPOINT_XFER_BULK);
 492                 if (ep == NULL) {
 493                         err("no transfer endpoint found");
 494                         return NULL;
 495                 }
 496         }
 497         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 498                         i, ep->desc.bEndpointAddress);
 499         if (i > 0) {
 500                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 501                 if (ret < 0) {
 502                         err("set interface err %d", ret);
 503                         return NULL;
 504                 }
 505         }
 506         gspca_dev->alt = i;             /* memorize the current alt setting */
 507         return ep;
 508 }
 509
 510 /*
 511  * create the URBs for image transfer
 512  */
 513 static int create_urbs(struct gspca_dev *gspca_dev,
 514                         struct usb_host_endpoint *ep)
 515 {
 516         struct urb *urb;
 517         int n, nurbs, i, psize, npkt, bsize;
 518
 519         /* calculate the packet size and the number of packets */
 520         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 521
 522         if (gspca_dev->alt != 0) {              /* isoc */
 523
 524                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 525                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 526                 npkt = ISO_MAX_SIZE / psize;
 527                 if (npkt > ISO_MAX_PKT)
 528                         npkt = ISO_MAX_PKT;
 529                 bsize = psize * npkt;
 530                 PDEBUG(D_STREAM,
 531                         "isoc %d pkts size %d = bsize:%d",
 532                         npkt, psize, bsize);
 533                 nurbs = DEF_NURBS;
 534         } else {                                /* bulk */
 535                 npkt = 0;
 536                 bsize = gspca_dev->cam.bulk_size;
 537                 if (bsize == 0)
 538                         bsize = psize;
 539                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 540                 if (gspca_dev->cam.bulk_nurbs != 0)
 541                         nurbs = gspca_dev->cam.bulk_nurbs;
 542                 else
 543                         nurbs = 1;
 544         }
 545
 546         gspca_dev->nurbs = nurbs;
 547         for (n = 0; n < nurbs; n++) {
 548                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 549                 if (!urb) {
 550                         err("usb_alloc_urb failed");
 551                         destroy_urbs(gspca_dev);
 552                         return -ENOMEM;
 553                 }
 554                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 555                                                 bsize,
 556                                                 GFP_KERNEL,
 557                                                 &urb->transfer_dma);
 558
 559                 if (urb->transfer_buffer == NULL) {
 560                         usb_free_urb(urb);
 561                         err("usb_buffer_urb failed");
 562                         destroy_urbs(gspca_dev);
 563                         return -ENOMEM;
 564                 }
 565                 gspca_dev->urb[n] = urb;
 566                 urb->dev = gspca_dev->dev;
 567                 urb->context = gspca_dev;
 568                 urb->transfer_buffer_length = bsize;
 569                 if (npkt != 0) {                /* ISOC */
 570                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 571                                                     ep->desc.bEndpointAddress);
 572                         urb->transfer_flags = URB_ISO_ASAP
 573                                         | URB_NO_TRANSFER_DMA_MAP;
 574                         urb->interval = ep->desc.bInterval;
 575                         urb->complete = isoc_irq;
 576                         urb->number_of_packets = npkt;
 577                         for (i = 0; i < npkt; i++) {
 578                                 urb->iso_frame_desc[i].length = psize;
 579                                 urb->iso_frame_desc[i].offset = psize * i;
 580                         }
 581                 } else {                /* bulk */
 582                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 583                                                 ep->desc.bEndpointAddress),
 584                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 585                         urb->complete = bulk_irq;
 586                 }
 587         }
 588         return 0;
 589 }
 590
 591 /*
 592  * start the USB transfer
 593  */
 594 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 595 {
 596         struct usb_host_endpoint *ep;
 597         int n, ret;
 598
 599         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 600                 return -ERESTARTSYS;
 601
 602         /* set the higher alternate setting and
 603          * loop until urb submit succeeds */
 604         gspca_dev->alt = gspca_dev->nbalt;
 605         for (;;) {
 606                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 607                 ep = get_ep(gspca_dev);
 608                 if (ep == NULL) {
 609                         ret = -EIO;
 610                         goto out;
 611                 }
 612                 ret = create_urbs(gspca_dev, ep);
 613                 if (ret < 0)
 614                         goto out;
 615
 616                 /* clear the bulk endpoint */
 617                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 618                         usb_clear_halt(gspca_dev->dev,
 619                                         usb_rcvintpipe(gspca_dev->dev,
 620                                                  gspca_dev->cam.epaddr));
 621
 622                 /* start the cam */
 623                 ret = gspca_dev->sd_desc->start(gspca_dev);
 624                 if (ret < 0) {
 625                         destroy_urbs(gspca_dev);
 626                         goto out;
 627                 }
 628                 gspca_dev->streaming = 1;
 629
 630                 /* some bulk transfers are started by the subdriver */
 631                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
 632                         break;
 633
 634                 /* submit the URBs */
 635                 for (n = 0; n < gspca_dev->nurbs; n++) {
 636                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 637                         if (ret < 0) {
 638                                 PDEBUG(D_ERR|D_STREAM,
 639                                         "usb_submit_urb [%d] err %d", n, ret);
 640                                 gspca_dev->streaming = 0;
 641                                 destroy_urbs(gspca_dev);
 642                                 if (ret == -ENOSPC) {
 643                                         msleep(20);     /* wait for kill
 644                                                          * complete */
 645                                         break;  /* try the previous alt */
 646                                 }
 647                                 goto out;
 648                         }
 649                 }
 650                 if (ret >= 0)
 651                         break;
 652         }
 653 out:
 654         mutex_unlock(&gspca_dev->usb_lock);
 655         return ret;
 656 }
 657
 658 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 659 {
 660         int ret;
 661
 662         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 663         if (ret < 0)
 664                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 665         return ret;
 666 }
 667
 668 /* Note: both the queue and the usb locks should be held when calling this */
 669 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 670 {
 671         gspca_dev->streaming = 0;
 672         if (gspca_dev->present
 673             && gspca_dev->sd_desc->stopN)
 674                 gspca_dev->sd_desc->stopN(gspca_dev);
 675         destroy_urbs(gspca_dev);
 676         gspca_set_alt0(gspca_dev);
 677         if (gspca_dev->sd_desc->stop0)
 678                 gspca_dev->sd_desc->stop0(gspca_dev);
 679         PDEBUG(D_STREAM, "stream off OK");
 680 }
 681
 682 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 683 {
 684         int i;
 685
 686         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 687         gspca_dev->curr_mode = i;
 688         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 689         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 690         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 691 }
 692
 693 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 694                         int width, int height)
 695 {
 696         int i;
 697
 698         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 699                 if (width >= gspca_dev->cam.cam_mode[i].width
 700                     && height >= gspca_dev->cam.cam_mode[i].height)
 701                         break;
 702         }
 703         return i;
 704 }
 705
 706 /*
 707  * search a mode with the right pixel format
 708  */
 709 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 710                         int mode,
 711                         int pixfmt)
 712 {
 713         int modeU, modeD;
 714
 715         modeU = modeD = mode;
 716         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 717                 if (--modeD >= 0) {
 718                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 719                                                                 == pixfmt)
 720                                 return modeD;
 721                 }
 722                 if (++modeU < gspca_dev->cam.nmodes) {
 723                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 724                                                                 == pixfmt)
 725                                 return modeU;
 726                 }
 727         }
 728         return -EINVAL;
 729 }
 730
 731 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 732                                 struct v4l2_fmtdesc *fmtdesc)
 733 {
 734         struct gspca_dev *gspca_dev = priv;
 735         int i, j, index;
 736         __u32 fmt_tb[8];
 737
 738         /* give an index to each format */
 739         index = 0;
 740         j = 0;
 741         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 742                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 743                 j = 0;
 744                 for (;;) {
 745                         if (fmt_tb[j] == fmt_tb[index])
 746                                 break;
 747                         j++;
 748                 }
 749                 if (j == index) {
 750                         if (fmtdesc->index == index)
 751                                 break;          /* new format */
 752                         index++;
 753                         if (index >= ARRAY_SIZE(fmt_tb))
 754                                 return -EINVAL;
 755                 }
 756         }
 757         if (i < 0)
 758                 return -EINVAL;         /* no more format */
 759
 760         fmtdesc->pixelformat = fmt_tb[index];
 761         if (gspca_is_compressed(fmt_tb[index]))
 762                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 763         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 764         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 765         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 766         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 767         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 768         fmtdesc->description[4] = '\0';
 769         return 0;
 770 }
 771
 772 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 773                             struct v4l2_format *fmt)
 774 {
 775         struct gspca_dev *gspca_dev = priv;
 776         int mode;
 777
 778         mode = gspca_dev->curr_mode;
 779         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 780                 sizeof fmt->fmt.pix);
 781         return 0;
 782 }
 783
 784 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 785                         struct v4l2_format *fmt)
 786 {
 787         int w, h, mode, mode2;
 788
 789         w = fmt->fmt.pix.width;
 790         h = fmt->fmt.pix.height;
 791
 792 #ifdef GSPCA_DEBUG
 793         if (gspca_debug & D_CONF)
 794                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 795 #endif
 796         /* search the closest mode for width and height */
 797         mode = wxh_to_mode(gspca_dev, w, h);
 798
 799         /* OK if right palette */
 800         if (gspca_dev->cam.cam_mode[mode].pixelformat
 801                                                 != fmt->fmt.pix.pixelformat) {
 802
 803                 /* else, search the closest mode with the same pixel format */
 804                 mode2 = gspca_get_mode(gspca_dev, mode,
 805                                         fmt->fmt.pix.pixelformat);
 806                 if (mode2 >= 0)
 807                         mode = mode2;
 808 /*              else
 809                         ;                * no chance, return this mode */
 810         }
 811         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 812                 sizeof fmt->fmt.pix);
 813         return mode;                    /* used when s_fmt */
 814 }
 815
 816 static int vidioc_try_fmt_vid_cap(struct file *file,
 817                               void *priv,
 818                               struct v4l2_format *fmt)
 819 {
 820         struct gspca_dev *gspca_dev = priv;
 821         int ret;
 822
 823         ret = try_fmt_vid_cap(gspca_dev, fmt);
 824         if (ret < 0)
 825                 return ret;
 826         return 0;
 827 }
 828
 829 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 830                             struct v4l2_format *fmt)
 831 {
 832         struct gspca_dev *gspca_dev = priv;
 833         int ret;
 834
 835         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 836                 return -ERESTARTSYS;
 837
 838         ret = try_fmt_vid_cap(gspca_dev, fmt);
 839         if (ret < 0)
 840                 goto out;
 841
 842         if (gspca_dev->nframes != 0
 843             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 844                 ret = -EINVAL;
 845                 goto out;
 846         }
 847
 848         if (ret == gspca_dev->curr_mode) {
 849                 ret = 0;
 850                 goto out;                       /* same mode */
 851         }
 852
 853         if (gspca_dev->streaming) {
 854                 ret = -EBUSY;
 855                 goto out;
 856         }
 857         gspca_dev->width = fmt->fmt.pix.width;
 858         gspca_dev->height = fmt->fmt.pix.height;
 859         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 860         gspca_dev->curr_mode = ret;
 861
 862         ret = 0;
 863 out:
 864         mutex_unlock(&gspca_dev->queue_lock);
 865         return ret;
 866 }
 867
 868 static void gspca_release(struct video_device *vfd)
 869 {
 870         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 871
 872         PDEBUG(D_STREAM, "device released");
 873
 874         kfree(gspca_dev->usb_buf);
 875         kfree(gspca_dev);
 876 }
 877
 878 static int dev_open(struct file *file)
 879 {
 880         struct gspca_dev *gspca_dev;
 881         int ret;
 882
 883         PDEBUG(D_STREAM, "%s open", current->comm);
 884         gspca_dev = (struct gspca_dev *) video_devdata(file);
 885         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 886                 return -ERESTARTSYS;
 887         if (!gspca_dev->present) {
 888                 ret = -ENODEV;
 889                 goto out;
 890         }
 891
 892         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 893                 ret = -EBUSY;
 894                 goto out;
 895         }
 896
 897         /* protect the subdriver against rmmod */
 898         if (!try_module_get(gspca_dev->module)) {
 899                 ret = -ENODEV;
 900                 goto out;
 901         }
 902
 903         gspca_dev->users++;
 904
 905         file->private_data = gspca_dev;
 906 #ifdef GSPCA_DEBUG
 907         /* activate the v4l2 debug */
 908         if (gspca_debug & D_V4L2)
 909                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 910                                         | V4L2_DEBUG_IOCTL_ARG;
 911         else
 912                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 913                                         | V4L2_DEBUG_IOCTL_ARG);
 914 #endif
 915         ret = 0;
 916 out:
 917         mutex_unlock(&gspca_dev->queue_lock);
 918         if (ret != 0)
 919                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 920         else
 921                 PDEBUG(D_STREAM, "open done");
 922         return ret;
 923 }
 924
 925 static int dev_close(struct file *file)
 926 {
 927         struct gspca_dev *gspca_dev = file->private_data;
 928
 929         PDEBUG(D_STREAM, "%s close", current->comm);
 930         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 931                 return -ERESTARTSYS;
 932         gspca_dev->users--;
 933
 934         /* if the file did the capture, free the streaming resources */
 935         if (gspca_dev->capt_file == file) {
 936                 if (gspca_dev->streaming) {
 937                         mutex_lock(&gspca_dev->usb_lock);
 938                         gspca_stream_off(gspca_dev);
 939                         mutex_unlock(&gspca_dev->usb_lock);
 940                 }
 941                 frame_free(gspca_dev);
 942                 gspca_dev->capt_file = NULL;
 943                 gspca_dev->memory = GSPCA_MEMORY_NO;
 944         }
 945         file->private_data = NULL;
 946         module_put(gspca_dev->module);
 947         mutex_unlock(&gspca_dev->queue_lock);
 948
 949         PDEBUG(D_STREAM, "close done");
 950
 951         return 0;
 952 }
 953
 954 static int vidioc_querycap(struct file *file, void  *priv,
 955                            struct v4l2_capability *cap)
 956 {
 957         struct gspca_dev *gspca_dev = priv;
 958
 959         memset(cap, 0, sizeof *cap);
 960         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 961         if (gspca_dev->dev->product != NULL) {
 962                 strncpy(cap->card, gspca_dev->dev->product,
 963                         sizeof cap->card);
 964         } else {
 965                 snprintf(cap->card, sizeof cap->card,
 966                         "USB Camera (%04x:%04x)",
 967                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 968                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 969         }
 970         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 971                 sizeof cap->bus_info);
 972         cap->version = DRIVER_VERSION_NUMBER;
 973         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 974                           | V4L2_CAP_STREAMING
 975                           | V4L2_CAP_READWRITE;
 976         return 0;
 977 }
 978
 979 static int vidioc_queryctrl(struct file *file, void *priv,
 980                            struct v4l2_queryctrl *q_ctrl)
 981 {
 982         struct gspca_dev *gspca_dev = priv;
 983         int i, ix;
 984         u32 id;
 985
 986         ix = -1;
 987         id = q_ctrl->id;
 988         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 989                 id &= V4L2_CTRL_ID_MASK;
 990                 id++;
 991                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 992                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 993                                 continue;
 994                         if (ix < 0) {
 995                                 ix = i;
 996                                 continue;
 997                         }
 998                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 999                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1000                                 continue;
1001                         ix = i;
1002                 }
1003         }
1004         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1005                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1006                         ix = i;
1007                         break;
1008                 }
1009         }
1010         if (ix < 0)
1011                 return -EINVAL;
1012         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1013                 sizeof *q_ctrl);
1014         if (gspca_dev->ctrl_dis & (1 << ix))
1015                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1016         return 0;
1017 }
1018
1019 static int vidioc_s_ctrl(struct file *file, void *priv,
1020                          struct v4l2_control *ctrl)
1021 {
1022         struct gspca_dev *gspca_dev = priv;
1023         const struct ctrl *ctrls;
1024         int i, ret;
1025
1026         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1027              i < gspca_dev->sd_desc->nctrls;
1028              i++, ctrls++) {
1029                 if (ctrl->id != ctrls->qctrl.id)
1030                         continue;
1031                 if (gspca_dev->ctrl_dis & (1 << i))
1032                         return -EINVAL;
1033                 if (ctrl->value < ctrls->qctrl.minimum
1034                     || ctrl->value > ctrls->qctrl.maximum)
1035                         return -ERANGE;
1036                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1037                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1038                         return -ERESTARTSYS;
1039                 ret = ctrls->set(gspca_dev, ctrl->value);
1040                 mutex_unlock(&gspca_dev->usb_lock);
1041                 return ret;
1042         }
1043         return -EINVAL;
1044 }
1045
1046 static int vidioc_g_ctrl(struct file *file, void *priv,
1047                          struct v4l2_control *ctrl)
1048 {
1049         struct gspca_dev *gspca_dev = priv;
1050
1051         const struct ctrl *ctrls;
1052         int i, ret;
1053
1054         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1055              i < gspca_dev->sd_desc->nctrls;
1056              i++, ctrls++) {
1057                 if (ctrl->id != ctrls->qctrl.id)
1058                         continue;
1059                 if (gspca_dev->ctrl_dis & (1 << i))
1060                         return -EINVAL;
1061                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1062                         return -ERESTARTSYS;
1063                 ret = ctrls->get(gspca_dev, &ctrl->value);
1064                 mutex_unlock(&gspca_dev->usb_lock);
1065                 return ret;
1066         }
1067         return -EINVAL;
1068 }
1069
1070 /*fixme: have an audio flag in gspca_dev?*/
1071 static int vidioc_s_audio(struct file *file, void *priv,
1072                          struct v4l2_audio *audio)
1073 {
1074         if (audio->index != 0)
1075                 return -EINVAL;
1076         return 0;
1077 }
1078
1079 static int vidioc_g_audio(struct file *file, void *priv,
1080                          struct v4l2_audio *audio)
1081 {
1082         memset(audio, 0, sizeof *audio);
1083         strcpy(audio->name, "Microphone");
1084         return 0;
1085 }
1086
1087 static int vidioc_enumaudio(struct file *file, void *priv,
1088                          struct v4l2_audio *audio)
1089 {
1090         if (audio->index != 0)
1091                 return -EINVAL;
1092
1093         strcpy(audio->name, "Microphone");
1094         audio->capability = 0;
1095         audio->mode = 0;
1096         return 0;
1097 }
1098
1099 static int vidioc_querymenu(struct file *file, void *priv,
1100                             struct v4l2_querymenu *qmenu)
1101 {
1102         struct gspca_dev *gspca_dev = priv;
1103
1104         if (!gspca_dev->sd_desc->querymenu)
1105                 return -EINVAL;
1106         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1107 }
1108
1109 static int vidioc_enum_input(struct file *file, void *priv,
1110                                 struct v4l2_input *input)
1111 {
1112         struct gspca_dev *gspca_dev = priv;
1113
1114         if (input->index != 0)
1115                 return -EINVAL;
1116         memset(input, 0, sizeof *input);
1117         input->type = V4L2_INPUT_TYPE_CAMERA;
1118         strncpy(input->name, gspca_dev->sd_desc->name,
1119                 sizeof input->name);
1120         return 0;
1121 }
1122
1123 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1124 {
1125         *i = 0;
1126         return 0;
1127 }
1128
1129 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1130 {
1131         if (i > 0)
1132                 return -EINVAL;
1133         return (0);
1134 }
1135
1136 static int vidioc_reqbufs(struct file *file, void *priv,
1137                           struct v4l2_requestbuffers *rb)
1138 {
1139         struct gspca_dev *gspca_dev = priv;
1140         int i, ret = 0;
1141
1142         switch (rb->memory) {
1143         case GSPCA_MEMORY_READ:                 /* (internal call) */
1144         case V4L2_MEMORY_MMAP:
1145         case V4L2_MEMORY_USERPTR:
1146                 break;
1147         default:
1148                 return -EINVAL;
1149         }
1150         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1151                 return -ERESTARTSYS;
1152
1153         if (gspca_dev->memory != GSPCA_MEMORY_NO
1154             && gspca_dev->memory != rb->memory) {
1155                 ret = -EBUSY;
1156                 goto out;
1157         }
1158
1159         /* only one file may do the capture */
1160         if (gspca_dev->capt_file != NULL
1161             && gspca_dev->capt_file != file) {
1162                 ret = -EBUSY;
1163                 goto out;
1164         }
1165
1166         /* if allocated, the buffers must not be mapped */
1167         for (i = 0; i < gspca_dev->nframes; i++) {
1168                 if (gspca_dev->frame[i].vma_use_count) {
1169                         ret = -EBUSY;
1170                         goto out;
1171                 }
1172         }
1173
1174         /* stop streaming */
1175         if (gspca_dev->streaming) {
1176                 mutex_lock(&gspca_dev->usb_lock);
1177                 gspca_stream_off(gspca_dev);
1178                 mutex_unlock(&gspca_dev->usb_lock);
1179         }
1180
1181         /* free the previous allocated buffers, if any */
1182         if (gspca_dev->nframes != 0) {
1183                 frame_free(gspca_dev);
1184                 gspca_dev->capt_file = NULL;
1185         }
1186         if (rb->count == 0)                     /* unrequest */
1187                 goto out;
1188         gspca_dev->memory = rb->memory;
1189         ret = frame_alloc(gspca_dev, rb->count);
1190         if (ret == 0) {
1191                 rb->count = gspca_dev->nframes;
1192                 gspca_dev->capt_file = file;
1193         }
1194 out:
1195         mutex_unlock(&gspca_dev->queue_lock);
1196         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1197         return ret;
1198 }
1199
1200 static int vidioc_querybuf(struct file *file, void *priv,
1201                            struct v4l2_buffer *v4l2_buf)
1202 {
1203         struct gspca_dev *gspca_dev = priv;
1204         struct gspca_frame *frame;
1205
1206         if (v4l2_buf->index < 0
1207             || v4l2_buf->index >= gspca_dev->nframes)
1208                 return -EINVAL;
1209
1210         frame = &gspca_dev->frame[v4l2_buf->index];
1211         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1212         return 0;
1213 }
1214
1215 static int vidioc_streamon(struct file *file, void *priv,
1216                            enum v4l2_buf_type buf_type)
1217 {
1218         struct gspca_dev *gspca_dev = priv;
1219         int ret;
1220
1221         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1222                 return -EINVAL;
1223         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1224                 return -ERESTARTSYS;
1225         if (!gspca_dev->present) {
1226                 ret = -ENODEV;
1227                 goto out;
1228         }
1229         if (gspca_dev->nframes == 0
1230             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1231                 ret = -EINVAL;
1232                 goto out;
1233         }
1234         if (!gspca_dev->streaming) {
1235                 ret = gspca_init_transfer(gspca_dev);
1236                 if (ret < 0)
1237                         goto out;
1238         }
1239 #ifdef GSPCA_DEBUG
1240         if (gspca_debug & D_STREAM) {
1241                 PDEBUG_MODE("stream on OK",
1242                         gspca_dev->pixfmt,
1243                         gspca_dev->width,
1244                         gspca_dev->height);
1245         }
1246 #endif
1247         ret = 0;
1248 out:
1249         mutex_unlock(&gspca_dev->queue_lock);
1250         return ret;
1251 }
1252
1253 static int vidioc_streamoff(struct file *file, void *priv,
1254                                 enum v4l2_buf_type buf_type)
1255 {
1256         struct gspca_dev *gspca_dev = priv;
1257         int i, ret;
1258
1259         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1260                 return -EINVAL;
1261         if (!gspca_dev->streaming)
1262                 return 0;
1263         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1264                 return -ERESTARTSYS;
1265
1266         /* stop streaming */
1267         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1268                 ret = -ERESTARTSYS;
1269                 goto out;
1270         }
1271         gspca_stream_off(gspca_dev);
1272         mutex_unlock(&gspca_dev->usb_lock);
1273
1274         /* empty the application queues */
1275         for (i = 0; i < gspca_dev->nframes; i++)
1276                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1277         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1278         gspca_dev->last_packet_type = DISCARD_PACKET;
1279         gspca_dev->sequence = 0;
1280         ret = 0;
1281 out:
1282         mutex_unlock(&gspca_dev->queue_lock);
1283         return ret;
1284 }
1285
1286 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1287                         struct v4l2_jpegcompression *jpegcomp)
1288 {
1289         struct gspca_dev *gspca_dev = priv;
1290         int ret;
1291
1292         if (!gspca_dev->sd_desc->get_jcomp)
1293                 return -EINVAL;
1294         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1295                 return -ERESTARTSYS;
1296         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1297         mutex_unlock(&gspca_dev->usb_lock);
1298         return ret;
1299 }
1300
1301 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1302                         struct v4l2_jpegcompression *jpegcomp)
1303 {
1304         struct gspca_dev *gspca_dev = priv;
1305         int ret;
1306
1307         if (!gspca_dev->sd_desc->set_jcomp)
1308                 return -EINVAL;
1309         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1310                 return -ERESTARTSYS;
1311         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1312         mutex_unlock(&gspca_dev->usb_lock);
1313         return ret;
1314 }
1315
1316 static int vidioc_g_parm(struct file *filp, void *priv,
1317                         struct v4l2_streamparm *parm)
1318 {
1319         struct gspca_dev *gspca_dev = priv;
1320
1321         memset(parm, 0, sizeof *parm);
1322         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1323         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1324
1325         if (gspca_dev->sd_desc->get_streamparm) {
1326                 int ret;
1327
1328                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1329                         return -ERESTARTSYS;
1330                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1331                 mutex_unlock(&gspca_dev->usb_lock);
1332                 return ret;
1333         }
1334
1335         return 0;
1336 }
1337
1338 static int vidioc_s_parm(struct file *filp, void *priv,
1339                         struct v4l2_streamparm *parm)
1340 {
1341         struct gspca_dev *gspca_dev = priv;
1342         int n;
1343
1344         n = parm->parm.capture.readbuffers;
1345         if (n == 0 || n > GSPCA_MAX_FRAMES)
1346                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1347         else
1348                 gspca_dev->nbufread = n;
1349
1350         if (gspca_dev->sd_desc->set_streamparm) {
1351                 int ret;
1352
1353                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1354                         return -ERESTARTSYS;
1355                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1356                 mutex_unlock(&gspca_dev->usb_lock);
1357                 return ret;
1358         }
1359
1360         return 0;
1361 }
1362
1363 static int vidioc_s_std(struct file *filp, void *priv,
1364                         v4l2_std_id *parm)
1365 {
1366         return 0;
1367 }
1368
1369 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1370 static int vidiocgmbuf(struct file *file, void *priv,
1371                         struct video_mbuf *mbuf)
1372 {
1373         struct gspca_dev *gspca_dev = file->private_data;
1374         int i;
1375
1376         PDEBUG(D_STREAM, "cgmbuf");
1377         if (gspca_dev->nframes == 0) {
1378                 int ret;
1379
1380                 {
1381                         struct v4l2_format fmt;
1382
1383                         memset(&fmt, 0, sizeof fmt);
1384                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1385                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1386                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1387                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1388                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1389                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1390                         if (ret != 0)
1391                                 return ret;
1392                 }
1393                 {
1394                         struct v4l2_requestbuffers rb;
1395
1396                         memset(&rb, 0, sizeof rb);
1397                         rb.count = 4;
1398                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1399                         rb.memory = V4L2_MEMORY_MMAP;
1400                         ret = vidioc_reqbufs(file, priv, &rb);
1401                         if (ret != 0)
1402                                 return ret;
1403                 }
1404         }
1405         mbuf->frames = gspca_dev->nframes;
1406         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1407         for (i = 0; i < mbuf->frames; i++)
1408                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1409         return 0;
1410 }
1411 #endif
1412
1413 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1414 {
1415         struct gspca_dev *gspca_dev = file->private_data;
1416         struct gspca_frame *frame;
1417         struct page *page;
1418         unsigned long addr, start, size;
1419         int i, ret;
1420
1421         start = vma->vm_start;
1422         size = vma->vm_end - vma->vm_start;
1423         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1424
1425         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1426                 return -ERESTARTSYS;
1427         if (!gspca_dev->present) {
1428                 ret = -ENODEV;
1429                 goto out;
1430         }
1431         if (gspca_dev->capt_file != file) {
1432                 ret = -EINVAL;
1433                 goto out;
1434         }
1435
1436         frame = NULL;
1437         for (i = 0; i < gspca_dev->nframes; ++i) {
1438                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1439                         PDEBUG(D_STREAM, "mmap bad memory type");
1440                         break;
1441                 }
1442                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1443                                                 == vma->vm_pgoff) {
1444                         frame = &gspca_dev->frame[i];
1445                         break;
1446                 }
1447         }
1448         if (frame == NULL) {
1449                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1450                 ret = -EINVAL;
1451                 goto out;
1452         }
1453 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1454         /* v4l1 maps all the buffers */
1455         if (i != 0
1456             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1457 #endif
1458             if (size != frame->v4l2_buf.length) {
1459                 PDEBUG(D_STREAM, "mmap bad size");
1460                 ret = -EINVAL;
1461                 goto out;
1462         }
1463
1464         /*
1465          * - VM_IO marks the area as being a mmaped region for I/O to a
1466          *   device. It also prevents the region from being core dumped.
1467          */
1468         vma->vm_flags |= VM_IO;
1469
1470         addr = (unsigned long) frame->data;
1471         while (size > 0) {
1472                 page = vmalloc_to_page((void *) addr);
1473                 ret = vm_insert_page(vma, start, page);
1474                 if (ret < 0)
1475                         goto out;
1476                 start += PAGE_SIZE;
1477                 addr += PAGE_SIZE;
1478                 size -= PAGE_SIZE;
1479         }
1480
1481         vma->vm_ops = &gspca_vm_ops;
1482         vma->vm_private_data = frame;
1483         gspca_vm_open(vma);
1484         ret = 0;
1485 out:
1486         mutex_unlock(&gspca_dev->queue_lock);
1487         return ret;
1488 }
1489
1490 /*
1491  * wait for a video frame
1492  *
1493  * If a frame is ready, its index is returned.
1494  */
1495 static int frame_wait(struct gspca_dev *gspca_dev,
1496                         int nonblock_ing)
1497 {
1498         struct gspca_frame *frame;
1499         int i, j, ret;
1500
1501         /* check if a frame is ready */
1502         i = gspca_dev->fr_o;
1503         j = gspca_dev->fr_queue[i];
1504         frame = &gspca_dev->frame[j];
1505
1506         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1507                 if (nonblock_ing)
1508                         return -EAGAIN;
1509
1510                 /* wait till a frame is ready */
1511                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1512                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1513                         !gspca_dev->streaming || !gspca_dev->present,
1514                         msecs_to_jiffies(3000));
1515                 if (ret < 0)
1516                         return ret;
1517                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1518                         return -EIO;
1519         }
1520
1521         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1522         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1523                 gspca_dev->fr_q,
1524                 gspca_dev->fr_i,
1525                 gspca_dev->fr_o);
1526
1527         if (gspca_dev->sd_desc->dq_callback) {
1528                 mutex_lock(&gspca_dev->usb_lock);
1529                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1530                 mutex_unlock(&gspca_dev->usb_lock);
1531         }
1532         return j;
1533 }
1534
1535 /*
1536  * dequeue a video buffer
1537  *
1538  * If nonblock_ing is false, block until a buffer is available.
1539  */
1540 static int vidioc_dqbuf(struct file *file, void *priv,
1541                         struct v4l2_buffer *v4l2_buf)
1542 {
1543         struct gspca_dev *gspca_dev = priv;
1544         struct gspca_frame *frame;
1545         int i, ret;
1546
1547         PDEBUG(D_FRAM, "dqbuf");
1548         if (v4l2_buf->memory != gspca_dev->memory)
1549                 return -EINVAL;
1550
1551         /* if not streaming, be sure the application will not loop forever */
1552         if (!(file->f_flags & O_NONBLOCK)
1553             && !gspca_dev->streaming && gspca_dev->users == 1)
1554                 return -EINVAL;
1555
1556         /* only the capturing file may dequeue */
1557         if (gspca_dev->capt_file != file)
1558                 return -EINVAL;
1559
1560         /* only one dequeue / read at a time */
1561         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1562                 return -ERESTARTSYS;
1563
1564         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1565         if (ret < 0)
1566                 goto out;
1567         i = ret;                                /* frame index */
1568         frame = &gspca_dev->frame[i];
1569         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1570                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1571                                  frame->data,
1572                                  frame->v4l2_buf.bytesused)) {
1573                         PDEBUG(D_ERR|D_STREAM,
1574                                 "dqbuf cp to user failed");
1575                         ret = -EFAULT;
1576                         goto out;
1577                 }
1578         }
1579         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1580         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1581         PDEBUG(D_FRAM, "dqbuf %d", i);
1582         ret = 0;
1583 out:
1584         mutex_unlock(&gspca_dev->read_lock);
1585         return ret;
1586 }
1587
1588 /*
1589  * queue a video buffer
1590  *
1591  * Attempting to queue a buffer that has already been
1592  * queued will return -EINVAL.
1593  */
1594 static int vidioc_qbuf(struct file *file, void *priv,
1595                         struct v4l2_buffer *v4l2_buf)
1596 {
1597         struct gspca_dev *gspca_dev = priv;
1598         struct gspca_frame *frame;
1599         int i, index, ret;
1600
1601         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1602
1603         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1604                 return -ERESTARTSYS;
1605
1606         index = v4l2_buf->index;
1607         if ((unsigned) index >= gspca_dev->nframes) {
1608                 PDEBUG(D_FRAM,
1609                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1610                 ret = -EINVAL;
1611                 goto out;
1612         }
1613         if (v4l2_buf->memory != gspca_dev->memory) {
1614                 PDEBUG(D_FRAM, "qbuf bad memory type");
1615                 ret = -EINVAL;
1616                 goto out;
1617         }
1618
1619         frame = &gspca_dev->frame[index];
1620         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1621                 PDEBUG(D_FRAM, "qbuf bad state");
1622                 ret = -EINVAL;
1623                 goto out;
1624         }
1625
1626         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1627
1628         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1629                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1630                 frame->v4l2_buf.length = v4l2_buf->length;
1631         }
1632
1633         /* put the buffer in the 'queued' queue */
1634         i = gspca_dev->fr_q;
1635         gspca_dev->fr_queue[i] = index;
1636         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1637         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1638                 gspca_dev->fr_q,
1639                 gspca_dev->fr_i,
1640                 gspca_dev->fr_o);
1641
1642         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1643         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1644         ret = 0;
1645 out:
1646         mutex_unlock(&gspca_dev->queue_lock);
1647         return ret;
1648 }
1649
1650 /*
1651  * allocate the resources for read()
1652  */
1653 static int read_alloc(struct gspca_dev *gspca_dev,
1654                         struct file *file)
1655 {
1656         struct v4l2_buffer v4l2_buf;
1657         int i, ret;
1658
1659         PDEBUG(D_STREAM, "read alloc");
1660         if (gspca_dev->nframes == 0) {
1661                 struct v4l2_requestbuffers rb;
1662
1663                 memset(&rb, 0, sizeof rb);
1664                 rb.count = gspca_dev->nbufread;
1665                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1666                 rb.memory = GSPCA_MEMORY_READ;
1667                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1668                 if (ret != 0) {
1669                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1670                         return ret;
1671                 }
1672                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1673                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1674                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1675                 for (i = 0; i < gspca_dev->nbufread; i++) {
1676                         v4l2_buf.index = i;
1677                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1678                         if (ret != 0) {
1679                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1680                                 return ret;
1681                         }
1682                 }
1683                 gspca_dev->memory = GSPCA_MEMORY_READ;
1684         }
1685
1686         /* start streaming */
1687         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1688         if (ret != 0)
1689                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1690         return ret;
1691 }
1692
1693 static unsigned int dev_poll(struct file *file, poll_table *wait)
1694 {
1695         struct gspca_dev *gspca_dev = file->private_data;
1696         int i, ret;
1697
1698         PDEBUG(D_FRAM, "poll");
1699
1700         poll_wait(file, &gspca_dev->wq, wait);
1701         if (!gspca_dev->present)
1702                 return POLLERR;
1703
1704         /* if reqbufs is not done, the user would use read() */
1705         if (gspca_dev->nframes == 0) {
1706                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1707                         return POLLERR;         /* not the 1st time */
1708                 ret = read_alloc(gspca_dev, file);
1709                 if (ret != 0)
1710                         return POLLERR;
1711         }
1712
1713         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1714                 return POLLERR;
1715         if (!gspca_dev->present) {
1716                 ret = POLLERR;
1717                 goto out;
1718         }
1719
1720         /* check the next incoming buffer */
1721         i = gspca_dev->fr_o;
1722         i = gspca_dev->fr_queue[i];
1723         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1724                 ret = POLLIN | POLLRDNORM;      /* something to read */
1725         else
1726                 ret = 0;
1727 out:
1728         mutex_unlock(&gspca_dev->queue_lock);
1729         return ret;
1730 }
1731
1732 static ssize_t dev_read(struct file *file, char __user *data,
1733                     size_t count, loff_t *ppos)
1734 {
1735         struct gspca_dev *gspca_dev = file->private_data;
1736         struct gspca_frame *frame;
1737         struct v4l2_buffer v4l2_buf;
1738         struct timeval timestamp;
1739         int n, ret, ret2;
1740
1741         PDEBUG(D_FRAM, "read (%zd)", count);
1742         if (!gspca_dev->present)
1743                 return -ENODEV;
1744         switch (gspca_dev->memory) {
1745         case GSPCA_MEMORY_NO:                   /* first time */
1746                 ret = read_alloc(gspca_dev, file);
1747                 if (ret != 0)
1748                         return ret;
1749                 break;
1750         case GSPCA_MEMORY_READ:
1751                 if (gspca_dev->capt_file == file)
1752                         break;
1753                 /* fall thru */
1754         default:
1755                 return -EINVAL;
1756         }
1757
1758         /* get a frame */
1759         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1760         timestamp.tv_sec--;
1761         n = 2;
1762         for (;;) {
1763                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1764                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1765                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1766                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1767                 if (ret != 0) {
1768                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1769                         return ret;
1770                 }
1771
1772                 /* if the process slept for more than 1 second,
1773                  * get a newer frame */
1774                 frame = &gspca_dev->frame[v4l2_buf.index];
1775                 if (--n < 0)
1776                         break;                  /* avoid infinite loop */
1777                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1778                         break;
1779                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1780                 if (ret != 0) {
1781                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1782                         return ret;
1783                 }
1784         }
1785
1786         /* copy the frame */
1787         if (count > frame->v4l2_buf.bytesused)
1788                 count = frame->v4l2_buf.bytesused;
1789         ret = copy_to_user(data, frame->data, count);
1790         if (ret != 0) {
1791                 PDEBUG(D_ERR|D_STREAM,
1792                         "read cp to user lack %d / %zd", ret, count);
1793                 ret = -EFAULT;
1794                 goto out;
1795         }
1796         ret = count;
1797 out:
1798         /* in each case, requeue the buffer */
1799         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1800         if (ret2 != 0)
1801                 return ret2;
1802         return ret;
1803 }
1804
1805 static struct v4l2_file_operations dev_fops = {
1806         .owner = THIS_MODULE,
1807         .open = dev_open,
1808         .release = dev_close,
1809         .read = dev_read,
1810         .mmap = dev_mmap,
1811         .unlocked_ioctl = video_ioctl2,
1812         .poll   = dev_poll,
1813 };
1814
1815 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1816         .vidioc_querycap        = vidioc_querycap,
1817         .vidioc_dqbuf           = vidioc_dqbuf,
1818         .vidioc_qbuf            = vidioc_qbuf,
1819         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1820         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1821         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1822         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1823         .vidioc_streamon        = vidioc_streamon,
1824         .vidioc_queryctrl       = vidioc_queryctrl,
1825         .vidioc_g_ctrl          = vidioc_g_ctrl,
1826         .vidioc_s_ctrl          = vidioc_s_ctrl,
1827         .vidioc_g_audio         = vidioc_g_audio,
1828         .vidioc_s_audio         = vidioc_s_audio,
1829         .vidioc_enumaudio       = vidioc_enumaudio,
1830         .vidioc_querymenu       = vidioc_querymenu,
1831         .vidioc_enum_input      = vidioc_enum_input,
1832         .vidioc_g_input         = vidioc_g_input,
1833         .vidioc_s_input         = vidioc_s_input,
1834         .vidioc_reqbufs         = vidioc_reqbufs,
1835         .vidioc_querybuf        = vidioc_querybuf,
1836         .vidioc_streamoff       = vidioc_streamoff,
1837         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1838         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1839         .vidioc_g_parm          = vidioc_g_parm,
1840         .vidioc_s_parm          = vidioc_s_parm,
1841         .vidioc_s_std           = vidioc_s_std,
1842 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1843         .vidiocgmbuf          = vidiocgmbuf,
1844 #endif
1845 };
1846
1847 static struct video_device gspca_template = {
1848         .name = "gspca main driver",
1849         .fops = &dev_fops,
1850         .ioctl_ops = &dev_ioctl_ops,
1851         .release = gspca_release,
1852         .minor = -1,
1853 };
1854
1855 /*
1856  * probe and create a new gspca device
1857  *
1858  * This function must be called by the sub-driver when it is
1859  * called for probing a new device.
1860  */
1861 int gspca_dev_probe(struct usb_interface *intf,
1862                 const struct usb_device_id *id,
1863                 const struct sd_desc *sd_desc,
1864                 int dev_size,
1865                 struct module *module)
1866 {
1867         struct usb_interface_descriptor *interface;
1868         struct gspca_dev *gspca_dev;
1869         struct usb_device *dev = interface_to_usbdev(intf);
1870         int ret;
1871
1872         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1873
1874         /* we don't handle multi-config cameras */
1875         if (dev->descriptor.bNumConfigurations != 1)
1876                 return -ENODEV;
1877         interface = &intf->cur_altsetting->desc;
1878         if (interface->bInterfaceNumber > 0)
1879                 return -ENODEV;
1880
1881         /* create the device */
1882         if (dev_size < sizeof *gspca_dev)
1883                 dev_size = sizeof *gspca_dev;
1884         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1885         if (!gspca_dev) {
1886                 err("couldn't kzalloc gspca struct");
1887                 return -ENOMEM;
1888         }
1889         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1890         if (!gspca_dev->usb_buf) {
1891                 err("out of memory");
1892                 ret = -ENOMEM;
1893                 goto out;
1894         }
1895         gspca_dev->dev = dev;
1896         gspca_dev->iface = interface->bInterfaceNumber;
1897         gspca_dev->nbalt = intf->num_altsetting;
1898         gspca_dev->sd_desc = sd_desc;
1899         gspca_dev->nbufread = 2;
1900         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1901
1902         /* configure the subdriver and initialize the USB device */
1903         ret = sd_desc->config(gspca_dev, id);
1904         if (ret < 0)
1905                 goto out;
1906         ret = sd_desc->init(gspca_dev);
1907         if (ret < 0)
1908                 goto out;
1909         ret = gspca_set_alt0(gspca_dev);
1910         if (ret < 0)
1911                 goto out;
1912         gspca_set_default_mode(gspca_dev);
1913
1914         mutex_init(&gspca_dev->usb_lock);
1915         mutex_init(&gspca_dev->read_lock);
1916         mutex_init(&gspca_dev->queue_lock);
1917         init_waitqueue_head(&gspca_dev->wq);
1918
1919         /* init video stuff */
1920         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1921         gspca_dev->vdev.parent = &dev->dev;
1922         gspca_dev->module = module;
1923         gspca_dev->present = 1;
1924         ret = video_register_device(&gspca_dev->vdev,
1925                                   VFL_TYPE_GRABBER,
1926                                   video_nr);
1927         if (ret < 0) {
1928                 err("video_register_device err %d", ret);
1929                 goto out;
1930         }
1931
1932         usb_set_intfdata(intf, gspca_dev);
1933         PDEBUG(D_PROBE, "probe ok");
1934         return 0;
1935 out:
1936         kfree(gspca_dev->usb_buf);
1937         kfree(gspca_dev);
1938         return ret;
1939 }
1940 EXPORT_SYMBOL(gspca_dev_probe);
1941
1942 /*
1943  * USB disconnection
1944  *
1945  * This function must be called by the sub-driver
1946  * when the device disconnects, after the specific resources are freed.
1947  */
1948 void gspca_disconnect(struct usb_interface *intf)
1949 {
1950         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1951
1952         gspca_dev->present = 0;
1953         gspca_dev->streaming = 0;
1954
1955         usb_set_intfdata(intf, NULL);
1956
1957         /* release the device */
1958         /* (this will call gspca_release() immediatly or on last close) */
1959         video_unregister_device(&gspca_dev->vdev);
1960
1961         PDEBUG(D_PROBE, "disconnect complete");
1962 }
1963 EXPORT_SYMBOL(gspca_disconnect);
1964
1965 #ifdef CONFIG_PM
1966 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1967 {
1968         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1969
1970         if (!gspca_dev->streaming)
1971                 return 0;
1972         gspca_dev->frozen = 1;          /* avoid urb error messages */
1973         if (gspca_dev->sd_desc->stopN)
1974                 gspca_dev->sd_desc->stopN(gspca_dev);
1975         destroy_urbs(gspca_dev);
1976         gspca_set_alt0(gspca_dev);
1977         if (gspca_dev->sd_desc->stop0)
1978                 gspca_dev->sd_desc->stop0(gspca_dev);
1979         return 0;
1980 }
1981 EXPORT_SYMBOL(gspca_suspend);
1982
1983 int gspca_resume(struct usb_interface *intf)
1984 {
1985         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1986
1987         gspca_dev->frozen = 0;
1988         gspca_dev->sd_desc->init(gspca_dev);
1989         if (gspca_dev->streaming)
1990                 return gspca_init_transfer(gspca_dev);
1991         return 0;
1992 }
1993 EXPORT_SYMBOL(gspca_resume);
1994 #endif
1995 /* -- cam driver utility functions -- */
1996
1997 /* auto gain and exposure algorithm based on the knee algorithm described here:
1998    http://ytse.tricolour.net/docs/LowLightOptimization.html
1999
2000    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2001    where changed. */
2002 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2003         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2004 {
2005         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2006         const struct ctrl *gain_ctrl = NULL;
2007         const struct ctrl *exposure_ctrl = NULL;
2008         const struct ctrl *autogain_ctrl = NULL;
2009         int retval = 0;
2010
2011         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2012                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2013                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2015                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2016                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2017                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2018         }
2019         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2020                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2021                         "on cam without (auto)gain/exposure");
2022                 return 0;
2023         }
2024
2025         if (gain_ctrl->get(gspca_dev, &gain) ||
2026                         exposure_ctrl->get(gspca_dev, &exposure) ||
2027                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2028                 return 0;
2029
2030         orig_gain = gain;
2031         orig_exposure = exposure;
2032
2033         /* If we are of a multiple of deadzone, do multiple steps to reach the
2034            desired lumination fast (with the risc of a slight overshoot) */
2035         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2036
2037         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2038                 avg_lum, desired_avg_lum, steps);
2039
2040         for (i = 0; i < steps; i++) {
2041                 if (avg_lum > desired_avg_lum) {
2042                         if (gain > gain_knee)
2043                                 gain--;
2044                         else if (exposure > exposure_knee)
2045                                 exposure--;
2046                         else if (gain > gain_ctrl->qctrl.default_value)
2047                                 gain--;
2048                         else if (exposure > exposure_ctrl->qctrl.minimum)
2049                                 exposure--;
2050                         else if (gain > gain_ctrl->qctrl.minimum)
2051                                 gain--;
2052                         else
2053                                 break;
2054                 } else {
2055                         if (gain < gain_ctrl->qctrl.default_value)
2056                                 gain++;
2057                         else if (exposure < exposure_knee)
2058                                 exposure++;
2059                         else if (gain < gain_knee)
2060                                 gain++;
2061                         else if (exposure < exposure_ctrl->qctrl.maximum)
2062                                 exposure++;
2063                         else if (gain < gain_ctrl->qctrl.maximum)
2064                                 gain++;
2065                         else
2066                                 break;
2067                 }
2068         }
2069
2070         if (gain != orig_gain) {
2071                 gain_ctrl->set(gspca_dev, gain);
2072                 retval = 1;
2073         }
2074         if (exposure != orig_exposure) {
2075                 exposure_ctrl->set(gspca_dev, exposure);
2076                 retval = 1;
2077         }
2078
2079         return retval;
2080 }
2081 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2082
2083 /* -- module insert / remove -- */
2084 static int __init gspca_init(void)
2085 {
2086         info("main v%d.%d.%d registered",
2087                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2088                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2089                 DRIVER_VERSION_NUMBER & 0xff);
2090         return 0;
2091 }
2092 static void __exit gspca_exit(void)
2093 {
2094         info("main deregistered");
2095 }
2096
2097 module_init(gspca_init);
2098 module_exit(gspca_exit);
2099
2100 #ifdef GSPCA_DEBUG
2101 module_param_named(debug, gspca_debug, int, 0644);
2102 MODULE_PARM_DESC(debug,
2103                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2104                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2105                 " 0x0100: v4l2");
2106 #endif