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                 BUG_ON(!gspca_dev->dev);
 426                 gspca_dev->urb[i] = NULL;
 427                 if (!gspca_dev->present)
 428                         usb_kill_urb(urb);
 429                 if (urb->transfer_buffer != NULL)
 430                         usb_buffer_free(gspca_dev->dev,
 431                                         urb->transfer_buffer_length,
 432                                         urb->transfer_buffer,
 433                                         urb->transfer_dma);
 434                 usb_free_urb(urb);
 435         }
 436 }
 437
 438 /*
 439  * look for an input transfer endpoint in an alternate setting
 440  */
 441 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 442                                           __u8 epaddr,
 443                                           __u8 xfer)
 444 {
 445         struct usb_host_endpoint *ep;
 446         int i, attr;
 447
 448         epaddr |= USB_DIR_IN;
 449         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 450                 ep = &alt->endpoint[i];
 451                 if (ep->desc.bEndpointAddress == epaddr) {
 452                         attr = ep->desc.bmAttributes
 453                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 454                         if (attr == xfer)
 455                                 return ep;
 456                         break;
 457                 }
 458         }
 459         return NULL;
 460 }
 461
 462 /*
 463  * look for an input (isoc or bulk) endpoint
 464  *
 465  * The endpoint is defined by the subdriver.
 466  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 467  * This routine may be called many times when the bandwidth is too small
 468  * (the bandwidth is checked on urb submit).
 469  */
 470 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 471 {
 472         struct usb_interface *intf;
 473         struct usb_host_endpoint *ep;
 474         int i, ret;
 475
 476         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 477         ep = NULL;
 478         i = gspca_dev->alt;                     /* previous alt setting */
 479
 480         /* try isoc */
 481         while (--i > 0) {                       /* alt 0 is unusable */
 482                 ep = alt_xfer(&intf->altsetting[i],
 483                                 gspca_dev->cam.epaddr,
 484                                 USB_ENDPOINT_XFER_ISOC);
 485                 if (ep)
 486                         break;
 487         }
 488
 489         /* if no isoc, try bulk */
 490         if (ep == NULL) {
 491                 ep = alt_xfer(&intf->altsetting[0],
 492                                 gspca_dev->cam.epaddr,
 493                                 USB_ENDPOINT_XFER_BULK);
 494                 if (ep == NULL) {
 495                         err("no transfer endpoint found");
 496                         return NULL;
 497                 }
 498         }
 499         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 500                         i, ep->desc.bEndpointAddress);
 501         if (i > 0) {
 502                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 503                 if (ret < 0) {
 504                         err("set interface err %d", ret);
 505                         return NULL;
 506                 }
 507         }
 508         gspca_dev->alt = i;             /* memorize the current alt setting */
 509         return ep;
 510 }
 511
 512 /*
 513  * create the URBs for image transfer
 514  */
 515 static int create_urbs(struct gspca_dev *gspca_dev,
 516                         struct usb_host_endpoint *ep)
 517 {
 518         struct urb *urb;
 519         int n, nurbs, i, psize, npkt, bsize;
 520
 521         /* calculate the packet size and the number of packets */
 522         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 523
 524         if (gspca_dev->alt != 0) {              /* isoc */
 525
 526                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 527                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 528                 npkt = ISO_MAX_SIZE / psize;
 529                 if (npkt > ISO_MAX_PKT)
 530                         npkt = ISO_MAX_PKT;
 531                 bsize = psize * npkt;
 532                 PDEBUG(D_STREAM,
 533                         "isoc %d pkts size %d = bsize:%d",
 534                         npkt, psize, bsize);
 535                 nurbs = DEF_NURBS;
 536         } else {                                /* bulk */
 537                 npkt = 0;
 538                 bsize = gspca_dev->cam.bulk_size;
 539                 if (bsize == 0)
 540                         bsize = psize;
 541                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 542                 if (gspca_dev->cam.bulk_nurbs != 0)
 543                         nurbs = gspca_dev->cam.bulk_nurbs;
 544                 else
 545                         nurbs = 1;
 546         }
 547
 548         gspca_dev->nurbs = nurbs;
 549         for (n = 0; n < nurbs; n++) {
 550                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 551                 if (!urb) {
 552                         err("usb_alloc_urb failed");
 553                         destroy_urbs(gspca_dev);
 554                         return -ENOMEM;
 555                 }
 556                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 557                                                 bsize,
 558                                                 GFP_KERNEL,
 559                                                 &urb->transfer_dma);
 560
 561                 if (urb->transfer_buffer == NULL) {
 562                         usb_free_urb(urb);
 563                         err("usb_buffer_urb failed");
 564                         destroy_urbs(gspca_dev);
 565                         return -ENOMEM;
 566                 }
 567                 gspca_dev->urb[n] = urb;
 568                 urb->dev = gspca_dev->dev;
 569                 urb->context = gspca_dev;
 570                 urb->transfer_buffer_length = bsize;
 571                 if (npkt != 0) {                /* ISOC */
 572                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 573                                                     ep->desc.bEndpointAddress);
 574                         urb->transfer_flags = URB_ISO_ASAP
 575                                         | URB_NO_TRANSFER_DMA_MAP;
 576                         urb->interval = ep->desc.bInterval;
 577                         urb->complete = isoc_irq;
 578                         urb->number_of_packets = npkt;
 579                         for (i = 0; i < npkt; i++) {
 580                                 urb->iso_frame_desc[i].length = psize;
 581                                 urb->iso_frame_desc[i].offset = psize * i;
 582                         }
 583                 } else {                /* bulk */
 584                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 585                                                 ep->desc.bEndpointAddress),
 586                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 587                         urb->complete = bulk_irq;
 588                 }
 589         }
 590         return 0;
 591 }
 592
 593 /*
 594  * start the USB transfer
 595  */
 596 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 597 {
 598         struct usb_host_endpoint *ep;
 599         int n, ret;
 600
 601         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 602                 return -ERESTARTSYS;
 603
 604         /* set the higher alternate setting and
 605          * loop until urb submit succeeds */
 606         gspca_dev->alt = gspca_dev->nbalt;
 607         for (;;) {
 608                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 609                 ep = get_ep(gspca_dev);
 610                 if (ep == NULL) {
 611                         ret = -EIO;
 612                         goto out;
 613                 }
 614                 ret = create_urbs(gspca_dev, ep);
 615                 if (ret < 0)
 616                         goto out;
 617
 618                 /* clear the bulk endpoint */
 619                 if (gspca_dev->alt == 0)        /* if bulk transfer */
 620                         usb_clear_halt(gspca_dev->dev,
 621                                         usb_rcvintpipe(gspca_dev->dev,
 622                                                  gspca_dev->cam.epaddr));
 623
 624                 /* start the cam */
 625                 ret = gspca_dev->sd_desc->start(gspca_dev);
 626                 if (ret < 0) {
 627                         destroy_urbs(gspca_dev);
 628                         goto out;
 629                 }
 630                 gspca_dev->streaming = 1;
 631
 632                 /* some bulk transfers are started by the subdriver */
 633                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
 634                         break;
 635
 636                 /* submit the URBs */
 637                 for (n = 0; n < gspca_dev->nurbs; n++) {
 638                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 639                         if (ret < 0) {
 640                                 PDEBUG(D_ERR|D_STREAM,
 641                                         "usb_submit_urb [%d] err %d", n, ret);
 642                                 gspca_dev->streaming = 0;
 643                                 destroy_urbs(gspca_dev);
 644                                 if (ret == -ENOSPC) {
 645                                         msleep(20);     /* wait for kill
 646                                                          * complete */
 647                                         break;  /* try the previous alt */
 648                                 }
 649                                 goto out;
 650                         }
 651                 }
 652                 if (ret >= 0)
 653                         break;
 654         }
 655 out:
 656         mutex_unlock(&gspca_dev->usb_lock);
 657         return ret;
 658 }
 659
 660 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 661 {
 662         int ret;
 663
 664         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 665         if (ret < 0)
 666                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 667         return ret;
 668 }
 669
 670 /* Note: both the queue and the usb locks should be held when calling this */
 671 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 672 {
 673         gspca_dev->streaming = 0;
 674         if (gspca_dev->present
 675             && gspca_dev->sd_desc->stopN)
 676                 gspca_dev->sd_desc->stopN(gspca_dev);
 677         destroy_urbs(gspca_dev);
 678         gspca_set_alt0(gspca_dev);
 679         if (gspca_dev->sd_desc->stop0)
 680                 gspca_dev->sd_desc->stop0(gspca_dev);
 681         PDEBUG(D_STREAM, "stream off OK");
 682 }
 683
 684 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 685 {
 686         int i;
 687
 688         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 689         gspca_dev->curr_mode = i;
 690         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 691         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 692         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 693 }
 694
 695 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 696                         int width, int height)
 697 {
 698         int i;
 699
 700         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 701                 if (width >= gspca_dev->cam.cam_mode[i].width
 702                     && height >= gspca_dev->cam.cam_mode[i].height)
 703                         break;
 704         }
 705         return i;
 706 }
 707
 708 /*
 709  * search a mode with the right pixel format
 710  */
 711 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 712                         int mode,
 713                         int pixfmt)
 714 {
 715         int modeU, modeD;
 716
 717         modeU = modeD = mode;
 718         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 719                 if (--modeD >= 0) {
 720                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 721                                                                 == pixfmt)
 722                                 return modeD;
 723                 }
 724                 if (++modeU < gspca_dev->cam.nmodes) {
 725                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 726                                                                 == pixfmt)
 727                                 return modeU;
 728                 }
 729         }
 730         return -EINVAL;
 731 }
 732
 733 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 734                                 struct v4l2_fmtdesc *fmtdesc)
 735 {
 736         struct gspca_dev *gspca_dev = priv;
 737         int i, j, index;
 738         __u32 fmt_tb[8];
 739
 740         /* give an index to each format */
 741         index = 0;
 742         j = 0;
 743         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 744                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 745                 j = 0;
 746                 for (;;) {
 747                         if (fmt_tb[j] == fmt_tb[index])
 748                                 break;
 749                         j++;
 750                 }
 751                 if (j == index) {
 752                         if (fmtdesc->index == index)
 753                                 break;          /* new format */
 754                         index++;
 755                         if (index >= ARRAY_SIZE(fmt_tb))
 756                                 return -EINVAL;
 757                 }
 758         }
 759         if (i < 0)
 760                 return -EINVAL;         /* no more format */
 761
 762         fmtdesc->pixelformat = fmt_tb[index];
 763         if (gspca_is_compressed(fmt_tb[index]))
 764                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 765         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 766         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 767         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 768         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 769         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 770         fmtdesc->description[4] = '\0';
 771         return 0;
 772 }
 773
 774 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 775                             struct v4l2_format *fmt)
 776 {
 777         struct gspca_dev *gspca_dev = priv;
 778         int mode;
 779
 780         mode = gspca_dev->curr_mode;
 781         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 782                 sizeof fmt->fmt.pix);
 783         return 0;
 784 }
 785
 786 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 787                         struct v4l2_format *fmt)
 788 {
 789         int w, h, mode, mode2;
 790
 791         w = fmt->fmt.pix.width;
 792         h = fmt->fmt.pix.height;
 793
 794 #ifdef GSPCA_DEBUG
 795         if (gspca_debug & D_CONF)
 796                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 797 #endif
 798         /* search the closest mode for width and height */
 799         mode = wxh_to_mode(gspca_dev, w, h);
 800
 801         /* OK if right palette */
 802         if (gspca_dev->cam.cam_mode[mode].pixelformat
 803                                                 != fmt->fmt.pix.pixelformat) {
 804
 805                 /* else, search the closest mode with the same pixel format */
 806                 mode2 = gspca_get_mode(gspca_dev, mode,
 807                                         fmt->fmt.pix.pixelformat);
 808                 if (mode2 >= 0)
 809                         mode = mode2;
 810 /*              else
 811                         ;                * no chance, return this mode */
 812         }
 813         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 814                 sizeof fmt->fmt.pix);
 815         return mode;                    /* used when s_fmt */
 816 }
 817
 818 static int vidioc_try_fmt_vid_cap(struct file *file,
 819                               void *priv,
 820                               struct v4l2_format *fmt)
 821 {
 822         struct gspca_dev *gspca_dev = priv;
 823         int ret;
 824
 825         ret = try_fmt_vid_cap(gspca_dev, fmt);
 826         if (ret < 0)
 827                 return ret;
 828         return 0;
 829 }
 830
 831 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 832                             struct v4l2_format *fmt)
 833 {
 834         struct gspca_dev *gspca_dev = priv;
 835         int ret;
 836
 837         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 838                 return -ERESTARTSYS;
 839
 840         ret = try_fmt_vid_cap(gspca_dev, fmt);
 841         if (ret < 0)
 842                 goto out;
 843
 844         if (gspca_dev->nframes != 0
 845             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 846                 ret = -EINVAL;
 847                 goto out;
 848         }
 849
 850         if (ret == gspca_dev->curr_mode) {
 851                 ret = 0;
 852                 goto out;                       /* same mode */
 853         }
 854
 855         if (gspca_dev->streaming) {
 856                 ret = -EBUSY;
 857                 goto out;
 858         }
 859         gspca_dev->width = fmt->fmt.pix.width;
 860         gspca_dev->height = fmt->fmt.pix.height;
 861         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 862         gspca_dev->curr_mode = ret;
 863
 864         ret = 0;
 865 out:
 866         mutex_unlock(&gspca_dev->queue_lock);
 867         return ret;
 868 }
 869
 870 static void gspca_release(struct video_device *vfd)
 871 {
 872         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 873
 874         PDEBUG(D_STREAM, "device released");
 875
 876         kfree(gspca_dev->usb_buf);
 877         kfree(gspca_dev);
 878 }
 879
 880 static int dev_open(struct file *file)
 881 {
 882         struct gspca_dev *gspca_dev;
 883         int ret;
 884
 885         PDEBUG(D_STREAM, "%s open", current->comm);
 886         gspca_dev = (struct gspca_dev *) video_devdata(file);
 887         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 888                 return -ERESTARTSYS;
 889         if (!gspca_dev->present) {
 890                 ret = -ENODEV;
 891                 goto out;
 892         }
 893
 894         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 895                 ret = -EBUSY;
 896                 goto out;
 897         }
 898
 899         /* protect the subdriver against rmmod */
 900         if (!try_module_get(gspca_dev->module)) {
 901                 ret = -ENODEV;
 902                 goto out;
 903         }
 904
 905         gspca_dev->users++;
 906
 907         file->private_data = gspca_dev;
 908 #ifdef GSPCA_DEBUG
 909         /* activate the v4l2 debug */
 910         if (gspca_debug & D_V4L2)
 911                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 912                                         | V4L2_DEBUG_IOCTL_ARG;
 913         else
 914                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 915                                         | V4L2_DEBUG_IOCTL_ARG);
 916 #endif
 917         ret = 0;
 918 out:
 919         mutex_unlock(&gspca_dev->queue_lock);
 920         if (ret != 0)
 921                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 922         else
 923                 PDEBUG(D_STREAM, "open done");
 924         return ret;
 925 }
 926
 927 static int dev_close(struct file *file)
 928 {
 929         struct gspca_dev *gspca_dev = file->private_data;
 930
 931         PDEBUG(D_STREAM, "%s close", current->comm);
 932         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 933                 return -ERESTARTSYS;
 934         gspca_dev->users--;
 935
 936         /* if the file did the capture, free the streaming resources */
 937         if (gspca_dev->capt_file == file) {
 938                 if (gspca_dev->streaming) {
 939                         mutex_lock(&gspca_dev->usb_lock);
 940                         gspca_stream_off(gspca_dev);
 941                         mutex_unlock(&gspca_dev->usb_lock);
 942                 }
 943                 frame_free(gspca_dev);
 944                 gspca_dev->capt_file = NULL;
 945                 gspca_dev->memory = GSPCA_MEMORY_NO;
 946         }
 947         file->private_data = NULL;
 948         module_put(gspca_dev->module);
 949         mutex_unlock(&gspca_dev->queue_lock);
 950
 951         PDEBUG(D_STREAM, "close done");
 952
 953         return 0;
 954 }
 955
 956 static int vidioc_querycap(struct file *file, void  *priv,
 957                            struct v4l2_capability *cap)
 958 {
 959         struct gspca_dev *gspca_dev = priv;
 960
 961         memset(cap, 0, sizeof *cap);
 962         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 963         if (gspca_dev->dev->product != NULL) {
 964                 strncpy(cap->card, gspca_dev->dev->product,
 965                         sizeof cap->card);
 966         } else {
 967                 snprintf(cap->card, sizeof cap->card,
 968                         "USB Camera (%04x:%04x)",
 969                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 970                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 971         }
 972         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 973                 sizeof cap->bus_info);
 974         cap->version = DRIVER_VERSION_NUMBER;
 975         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 976                           | V4L2_CAP_STREAMING
 977                           | V4L2_CAP_READWRITE;
 978         return 0;
 979 }
 980
 981 static int vidioc_queryctrl(struct file *file, void *priv,
 982                            struct v4l2_queryctrl *q_ctrl)
 983 {
 984         struct gspca_dev *gspca_dev = priv;
 985         int i, ix;
 986         u32 id;
 987
 988         ix = -1;
 989         id = q_ctrl->id;
 990         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 991                 id &= V4L2_CTRL_ID_MASK;
 992                 id++;
 993                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 994                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 995                                 continue;
 996                         if (ix < 0) {
 997                                 ix = i;
 998                                 continue;
 999                         }
1000                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1001                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1002                                 continue;
1003                         ix = i;
1004                 }
1005         }
1006         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1007                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1008                         ix = i;
1009                         break;
1010                 }
1011         }
1012         if (ix < 0)
1013                 return -EINVAL;
1014         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1015                 sizeof *q_ctrl);
1016         if (gspca_dev->ctrl_dis & (1 << ix))
1017                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1018         return 0;
1019 }
1020
1021 static int vidioc_s_ctrl(struct file *file, void *priv,
1022                          struct v4l2_control *ctrl)
1023 {
1024         struct gspca_dev *gspca_dev = priv;
1025         const struct ctrl *ctrls;
1026         int i, ret;
1027
1028         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1029              i < gspca_dev->sd_desc->nctrls;
1030              i++, ctrls++) {
1031                 if (ctrl->id != ctrls->qctrl.id)
1032                         continue;
1033                 if (gspca_dev->ctrl_dis & (1 << i))
1034                         return -EINVAL;
1035                 if (ctrl->value < ctrls->qctrl.minimum
1036                     || ctrl->value > ctrls->qctrl.maximum)
1037                         return -ERANGE;
1038                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1039                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1040                         return -ERESTARTSYS;
1041                 ret = ctrls->set(gspca_dev, ctrl->value);
1042                 mutex_unlock(&gspca_dev->usb_lock);
1043                 return ret;
1044         }
1045         return -EINVAL;
1046 }
1047
1048 static int vidioc_g_ctrl(struct file *file, void *priv,
1049                          struct v4l2_control *ctrl)
1050 {
1051         struct gspca_dev *gspca_dev = priv;
1052
1053         const struct ctrl *ctrls;
1054         int i, ret;
1055
1056         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1057              i < gspca_dev->sd_desc->nctrls;
1058              i++, ctrls++) {
1059                 if (ctrl->id != ctrls->qctrl.id)
1060                         continue;
1061                 if (gspca_dev->ctrl_dis & (1 << i))
1062                         return -EINVAL;
1063                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1064                         return -ERESTARTSYS;
1065                 ret = ctrls->get(gspca_dev, &ctrl->value);
1066                 mutex_unlock(&gspca_dev->usb_lock);
1067                 return ret;
1068         }
1069         return -EINVAL;
1070 }
1071
1072 /*fixme: have an audio flag in gspca_dev?*/
1073 static int vidioc_s_audio(struct file *file, void *priv,
1074                          struct v4l2_audio *audio)
1075 {
1076         if (audio->index != 0)
1077                 return -EINVAL;
1078         return 0;
1079 }
1080
1081 static int vidioc_g_audio(struct file *file, void *priv,
1082                          struct v4l2_audio *audio)
1083 {
1084         memset(audio, 0, sizeof *audio);
1085         strcpy(audio->name, "Microphone");
1086         return 0;
1087 }
1088
1089 static int vidioc_enumaudio(struct file *file, void *priv,
1090                          struct v4l2_audio *audio)
1091 {
1092         if (audio->index != 0)
1093                 return -EINVAL;
1094
1095         strcpy(audio->name, "Microphone");
1096         audio->capability = 0;
1097         audio->mode = 0;
1098         return 0;
1099 }
1100
1101 static int vidioc_querymenu(struct file *file, void *priv,
1102                             struct v4l2_querymenu *qmenu)
1103 {
1104         struct gspca_dev *gspca_dev = priv;
1105
1106         if (!gspca_dev->sd_desc->querymenu)
1107                 return -EINVAL;
1108         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1109 }
1110
1111 static int vidioc_enum_input(struct file *file, void *priv,
1112                                 struct v4l2_input *input)
1113 {
1114         struct gspca_dev *gspca_dev = priv;
1115
1116         if (input->index != 0)
1117                 return -EINVAL;
1118         memset(input, 0, sizeof *input);
1119         input->type = V4L2_INPUT_TYPE_CAMERA;
1120         strncpy(input->name, gspca_dev->sd_desc->name,
1121                 sizeof input->name);
1122         return 0;
1123 }
1124
1125 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1126 {
1127         *i = 0;
1128         return 0;
1129 }
1130
1131 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1132 {
1133         if (i > 0)
1134                 return -EINVAL;
1135         return (0);
1136 }
1137
1138 static int vidioc_reqbufs(struct file *file, void *priv,
1139                           struct v4l2_requestbuffers *rb)
1140 {
1141         struct gspca_dev *gspca_dev = priv;
1142         int i, ret = 0;
1143
1144         switch (rb->memory) {
1145         case GSPCA_MEMORY_READ:                 /* (internal call) */
1146         case V4L2_MEMORY_MMAP:
1147         case V4L2_MEMORY_USERPTR:
1148                 break;
1149         default:
1150                 return -EINVAL;
1151         }
1152         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1153                 return -ERESTARTSYS;
1154
1155         if (gspca_dev->memory != GSPCA_MEMORY_NO
1156             && gspca_dev->memory != rb->memory) {
1157                 ret = -EBUSY;
1158                 goto out;
1159         }
1160
1161         /* only one file may do the capture */
1162         if (gspca_dev->capt_file != NULL
1163             && gspca_dev->capt_file != file) {
1164                 ret = -EBUSY;
1165                 goto out;
1166         }
1167
1168         /* if allocated, the buffers must not be mapped */
1169         for (i = 0; i < gspca_dev->nframes; i++) {
1170                 if (gspca_dev->frame[i].vma_use_count) {
1171                         ret = -EBUSY;
1172                         goto out;
1173                 }
1174         }
1175
1176         /* stop streaming */
1177         if (gspca_dev->streaming) {
1178                 mutex_lock(&gspca_dev->usb_lock);
1179                 gspca_stream_off(gspca_dev);
1180                 mutex_unlock(&gspca_dev->usb_lock);
1181         }
1182
1183         /* free the previous allocated buffers, if any */
1184         if (gspca_dev->nframes != 0) {
1185                 frame_free(gspca_dev);
1186                 gspca_dev->capt_file = NULL;
1187         }
1188         if (rb->count == 0)                     /* unrequest */
1189                 goto out;
1190         gspca_dev->memory = rb->memory;
1191         ret = frame_alloc(gspca_dev, rb->count);
1192         if (ret == 0) {
1193                 rb->count = gspca_dev->nframes;
1194                 gspca_dev->capt_file = file;
1195         }
1196 out:
1197         mutex_unlock(&gspca_dev->queue_lock);
1198         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1199         return ret;
1200 }
1201
1202 static int vidioc_querybuf(struct file *file, void *priv,
1203                            struct v4l2_buffer *v4l2_buf)
1204 {
1205         struct gspca_dev *gspca_dev = priv;
1206         struct gspca_frame *frame;
1207
1208         if (v4l2_buf->index < 0
1209             || v4l2_buf->index >= gspca_dev->nframes)
1210                 return -EINVAL;
1211
1212         frame = &gspca_dev->frame[v4l2_buf->index];
1213         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1214         return 0;
1215 }
1216
1217 static int vidioc_streamon(struct file *file, void *priv,
1218                            enum v4l2_buf_type buf_type)
1219 {
1220         struct gspca_dev *gspca_dev = priv;
1221         int ret;
1222
1223         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1224                 return -EINVAL;
1225         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1226                 return -ERESTARTSYS;
1227         if (!gspca_dev->present) {
1228                 ret = -ENODEV;
1229                 goto out;
1230         }
1231         if (gspca_dev->nframes == 0
1232             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1233                 ret = -EINVAL;
1234                 goto out;
1235         }
1236         if (!gspca_dev->streaming) {
1237                 ret = gspca_init_transfer(gspca_dev);
1238                 if (ret < 0)
1239                         goto out;
1240         }
1241 #ifdef GSPCA_DEBUG
1242         if (gspca_debug & D_STREAM) {
1243                 PDEBUG_MODE("stream on OK",
1244                         gspca_dev->pixfmt,
1245                         gspca_dev->width,
1246                         gspca_dev->height);
1247         }
1248 #endif
1249         ret = 0;
1250 out:
1251         mutex_unlock(&gspca_dev->queue_lock);
1252         return ret;
1253 }
1254
1255 static int vidioc_streamoff(struct file *file, void *priv,
1256                                 enum v4l2_buf_type buf_type)
1257 {
1258         struct gspca_dev *gspca_dev = priv;
1259         int i, ret;
1260
1261         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1262                 return -EINVAL;
1263         if (!gspca_dev->streaming)
1264                 return 0;
1265         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1266                 return -ERESTARTSYS;
1267
1268         /* stop streaming */
1269         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1270                 ret = -ERESTARTSYS;
1271                 goto out;
1272         }
1273         gspca_stream_off(gspca_dev);
1274         mutex_unlock(&gspca_dev->usb_lock);
1275
1276         /* empty the application queues */
1277         for (i = 0; i < gspca_dev->nframes; i++)
1278                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1279         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1280         gspca_dev->last_packet_type = DISCARD_PACKET;
1281         gspca_dev->sequence = 0;
1282         ret = 0;
1283 out:
1284         mutex_unlock(&gspca_dev->queue_lock);
1285         return ret;
1286 }
1287
1288 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1289                         struct v4l2_jpegcompression *jpegcomp)
1290 {
1291         struct gspca_dev *gspca_dev = priv;
1292         int ret;
1293
1294         if (!gspca_dev->sd_desc->get_jcomp)
1295                 return -EINVAL;
1296         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1297                 return -ERESTARTSYS;
1298         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1299         mutex_unlock(&gspca_dev->usb_lock);
1300         return ret;
1301 }
1302
1303 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1304                         struct v4l2_jpegcompression *jpegcomp)
1305 {
1306         struct gspca_dev *gspca_dev = priv;
1307         int ret;
1308
1309         if (!gspca_dev->sd_desc->set_jcomp)
1310                 return -EINVAL;
1311         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1312                 return -ERESTARTSYS;
1313         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1314         mutex_unlock(&gspca_dev->usb_lock);
1315         return ret;
1316 }
1317
1318 static int vidioc_g_parm(struct file *filp, void *priv,
1319                         struct v4l2_streamparm *parm)
1320 {
1321         struct gspca_dev *gspca_dev = priv;
1322
1323         memset(parm, 0, sizeof *parm);
1324         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1325         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1326
1327         if (gspca_dev->sd_desc->get_streamparm) {
1328                 int ret;
1329
1330                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1331                         return -ERESTARTSYS;
1332                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1333                 mutex_unlock(&gspca_dev->usb_lock);
1334                 return ret;
1335         }
1336
1337         return 0;
1338 }
1339
1340 static int vidioc_s_parm(struct file *filp, void *priv,
1341                         struct v4l2_streamparm *parm)
1342 {
1343         struct gspca_dev *gspca_dev = priv;
1344         int n;
1345
1346         n = parm->parm.capture.readbuffers;
1347         if (n == 0 || n > GSPCA_MAX_FRAMES)
1348                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1349         else
1350                 gspca_dev->nbufread = n;
1351
1352         if (gspca_dev->sd_desc->set_streamparm) {
1353                 int ret;
1354
1355                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1356                         return -ERESTARTSYS;
1357                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1358                 mutex_unlock(&gspca_dev->usb_lock);
1359                 return ret;
1360         }
1361
1362         return 0;
1363 }
1364
1365 static int vidioc_s_std(struct file *filp, void *priv,
1366                         v4l2_std_id *parm)
1367 {
1368         return 0;
1369 }
1370
1371 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1372 static int vidiocgmbuf(struct file *file, void *priv,
1373                         struct video_mbuf *mbuf)
1374 {
1375         struct gspca_dev *gspca_dev = file->private_data;
1376         int i;
1377
1378         PDEBUG(D_STREAM, "cgmbuf");
1379         if (gspca_dev->nframes == 0) {
1380                 int ret;
1381
1382                 {
1383                         struct v4l2_format fmt;
1384
1385                         memset(&fmt, 0, sizeof fmt);
1386                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1387                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1388                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1389                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1390                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1391                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1392                         if (ret != 0)
1393                                 return ret;
1394                 }
1395                 {
1396                         struct v4l2_requestbuffers rb;
1397
1398                         memset(&rb, 0, sizeof rb);
1399                         rb.count = 4;
1400                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1401                         rb.memory = V4L2_MEMORY_MMAP;
1402                         ret = vidioc_reqbufs(file, priv, &rb);
1403                         if (ret != 0)
1404                                 return ret;
1405                 }
1406         }
1407         mbuf->frames = gspca_dev->nframes;
1408         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1409         for (i = 0; i < mbuf->frames; i++)
1410                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1411         return 0;
1412 }
1413 #endif
1414
1415 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1416 {
1417         struct gspca_dev *gspca_dev = file->private_data;
1418         struct gspca_frame *frame;
1419         struct page *page;
1420         unsigned long addr, start, size;
1421         int i, ret;
1422
1423         start = vma->vm_start;
1424         size = vma->vm_end - vma->vm_start;
1425         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1426
1427         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1428                 return -ERESTARTSYS;
1429         if (!gspca_dev->present) {
1430                 ret = -ENODEV;
1431                 goto out;
1432         }
1433         if (gspca_dev->capt_file != file) {
1434                 ret = -EINVAL;
1435                 goto out;
1436         }
1437
1438         frame = NULL;
1439         for (i = 0; i < gspca_dev->nframes; ++i) {
1440                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1441                         PDEBUG(D_STREAM, "mmap bad memory type");
1442                         break;
1443                 }
1444                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1445                                                 == vma->vm_pgoff) {
1446                         frame = &gspca_dev->frame[i];
1447                         break;
1448                 }
1449         }
1450         if (frame == NULL) {
1451                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1452                 ret = -EINVAL;
1453                 goto out;
1454         }
1455 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1456         /* v4l1 maps all the buffers */
1457         if (i != 0
1458             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1459 #endif
1460             if (size != frame->v4l2_buf.length) {
1461                 PDEBUG(D_STREAM, "mmap bad size");
1462                 ret = -EINVAL;
1463                 goto out;
1464         }
1465
1466         /*
1467          * - VM_IO marks the area as being a mmaped region for I/O to a
1468          *   device. It also prevents the region from being core dumped.
1469          */
1470         vma->vm_flags |= VM_IO;
1471
1472         addr = (unsigned long) frame->data;
1473         while (size > 0) {
1474                 page = vmalloc_to_page((void *) addr);
1475                 ret = vm_insert_page(vma, start, page);
1476                 if (ret < 0)
1477                         goto out;
1478                 start += PAGE_SIZE;
1479                 addr += PAGE_SIZE;
1480                 size -= PAGE_SIZE;
1481         }
1482
1483         vma->vm_ops = &gspca_vm_ops;
1484         vma->vm_private_data = frame;
1485         gspca_vm_open(vma);
1486         ret = 0;
1487 out:
1488         mutex_unlock(&gspca_dev->queue_lock);
1489         return ret;
1490 }
1491
1492 /*
1493  * wait for a video frame
1494  *
1495  * If a frame is ready, its index is returned.
1496  */
1497 static int frame_wait(struct gspca_dev *gspca_dev,
1498                         int nonblock_ing)
1499 {
1500         struct gspca_frame *frame;
1501         int i, j, ret;
1502
1503         /* check if a frame is ready */
1504         i = gspca_dev->fr_o;
1505         j = gspca_dev->fr_queue[i];
1506         frame = &gspca_dev->frame[j];
1507
1508         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1509                 if (nonblock_ing)
1510                         return -EAGAIN;
1511
1512                 /* wait till a frame is ready */
1513                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1514                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1515                         !gspca_dev->streaming || !gspca_dev->present,
1516                         msecs_to_jiffies(3000));
1517                 if (ret < 0)
1518                         return ret;
1519                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1520                         return -EIO;
1521         }
1522
1523         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1524         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1525                 gspca_dev->fr_q,
1526                 gspca_dev->fr_i,
1527                 gspca_dev->fr_o);
1528
1529         if (gspca_dev->sd_desc->dq_callback) {
1530                 mutex_lock(&gspca_dev->usb_lock);
1531                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1532                 mutex_unlock(&gspca_dev->usb_lock);
1533         }
1534         return j;
1535 }
1536
1537 /*
1538  * dequeue a video buffer
1539  *
1540  * If nonblock_ing is false, block until a buffer is available.
1541  */
1542 static int vidioc_dqbuf(struct file *file, void *priv,
1543                         struct v4l2_buffer *v4l2_buf)
1544 {
1545         struct gspca_dev *gspca_dev = priv;
1546         struct gspca_frame *frame;
1547         int i, ret;
1548
1549         PDEBUG(D_FRAM, "dqbuf");
1550         if (v4l2_buf->memory != gspca_dev->memory)
1551                 return -EINVAL;
1552
1553         /* if not streaming, be sure the application will not loop forever */
1554         if (!(file->f_flags & O_NONBLOCK)
1555             && !gspca_dev->streaming && gspca_dev->users == 1)
1556                 return -EINVAL;
1557
1558         /* only the capturing file may dequeue */
1559         if (gspca_dev->capt_file != file)
1560                 return -EINVAL;
1561
1562         /* only one dequeue / read at a time */
1563         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1564                 return -ERESTARTSYS;
1565
1566         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1567         if (ret < 0)
1568                 goto out;
1569         i = ret;                                /* frame index */
1570         frame = &gspca_dev->frame[i];
1571         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1572                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1573                                  frame->data,
1574                                  frame->v4l2_buf.bytesused)) {
1575                         PDEBUG(D_ERR|D_STREAM,
1576                                 "dqbuf cp to user failed");
1577                         ret = -EFAULT;
1578                         goto out;
1579                 }
1580         }
1581         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1582         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1583         PDEBUG(D_FRAM, "dqbuf %d", i);
1584         ret = 0;
1585 out:
1586         mutex_unlock(&gspca_dev->read_lock);
1587         return ret;
1588 }
1589
1590 /*
1591  * queue a video buffer
1592  *
1593  * Attempting to queue a buffer that has already been
1594  * queued will return -EINVAL.
1595  */
1596 static int vidioc_qbuf(struct file *file, void *priv,
1597                         struct v4l2_buffer *v4l2_buf)
1598 {
1599         struct gspca_dev *gspca_dev = priv;
1600         struct gspca_frame *frame;
1601         int i, index, ret;
1602
1603         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1604
1605         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1606                 return -ERESTARTSYS;
1607
1608         index = v4l2_buf->index;
1609         if ((unsigned) index >= gspca_dev->nframes) {
1610                 PDEBUG(D_FRAM,
1611                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1612                 ret = -EINVAL;
1613                 goto out;
1614         }
1615         if (v4l2_buf->memory != gspca_dev->memory) {
1616                 PDEBUG(D_FRAM, "qbuf bad memory type");
1617                 ret = -EINVAL;
1618                 goto out;
1619         }
1620
1621         frame = &gspca_dev->frame[index];
1622         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1623                 PDEBUG(D_FRAM, "qbuf bad state");
1624                 ret = -EINVAL;
1625                 goto out;
1626         }
1627
1628         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1629
1630         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1631                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1632                 frame->v4l2_buf.length = v4l2_buf->length;
1633         }
1634
1635         /* put the buffer in the 'queued' queue */
1636         i = gspca_dev->fr_q;
1637         gspca_dev->fr_queue[i] = index;
1638         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1639         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1640                 gspca_dev->fr_q,
1641                 gspca_dev->fr_i,
1642                 gspca_dev->fr_o);
1643
1644         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1645         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1646         ret = 0;
1647 out:
1648         mutex_unlock(&gspca_dev->queue_lock);
1649         return ret;
1650 }
1651
1652 /*
1653  * allocate the resources for read()
1654  */
1655 static int read_alloc(struct gspca_dev *gspca_dev,
1656                         struct file *file)
1657 {
1658         struct v4l2_buffer v4l2_buf;
1659         int i, ret;
1660
1661         PDEBUG(D_STREAM, "read alloc");
1662         if (gspca_dev->nframes == 0) {
1663                 struct v4l2_requestbuffers rb;
1664
1665                 memset(&rb, 0, sizeof rb);
1666                 rb.count = gspca_dev->nbufread;
1667                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1668                 rb.memory = GSPCA_MEMORY_READ;
1669                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1670                 if (ret != 0) {
1671                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1672                         return ret;
1673                 }
1674                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1675                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1676                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1677                 for (i = 0; i < gspca_dev->nbufread; i++) {
1678                         v4l2_buf.index = i;
1679                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1680                         if (ret != 0) {
1681                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1682                                 return ret;
1683                         }
1684                 }
1685                 gspca_dev->memory = GSPCA_MEMORY_READ;
1686         }
1687
1688         /* start streaming */
1689         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1690         if (ret != 0)
1691                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1692         return ret;
1693 }
1694
1695 static unsigned int dev_poll(struct file *file, poll_table *wait)
1696 {
1697         struct gspca_dev *gspca_dev = file->private_data;
1698         int i, ret;
1699
1700         PDEBUG(D_FRAM, "poll");
1701
1702         poll_wait(file, &gspca_dev->wq, wait);
1703         if (!gspca_dev->present)
1704                 return POLLERR;
1705
1706         /* if reqbufs is not done, the user would use read() */
1707         if (gspca_dev->nframes == 0) {
1708                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1709                         return POLLERR;         /* not the 1st time */
1710                 ret = read_alloc(gspca_dev, file);
1711                 if (ret != 0)
1712                         return POLLERR;
1713         }
1714
1715         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1716                 return POLLERR;
1717         if (!gspca_dev->present) {
1718                 ret = POLLERR;
1719                 goto out;
1720         }
1721
1722         /* check the next incoming buffer */
1723         i = gspca_dev->fr_o;
1724         i = gspca_dev->fr_queue[i];
1725         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1726                 ret = POLLIN | POLLRDNORM;      /* something to read */
1727         else
1728                 ret = 0;
1729 out:
1730         mutex_unlock(&gspca_dev->queue_lock);
1731         return ret;
1732 }
1733
1734 static ssize_t dev_read(struct file *file, char __user *data,
1735                     size_t count, loff_t *ppos)
1736 {
1737         struct gspca_dev *gspca_dev = file->private_data;
1738         struct gspca_frame *frame;
1739         struct v4l2_buffer v4l2_buf;
1740         struct timeval timestamp;
1741         int n, ret, ret2;
1742
1743         PDEBUG(D_FRAM, "read (%zd)", count);
1744         if (!gspca_dev->present)
1745                 return -ENODEV;
1746         switch (gspca_dev->memory) {
1747         case GSPCA_MEMORY_NO:                   /* first time */
1748                 ret = read_alloc(gspca_dev, file);
1749                 if (ret != 0)
1750                         return ret;
1751                 break;
1752         case GSPCA_MEMORY_READ:
1753                 if (gspca_dev->capt_file == file)
1754                         break;
1755                 /* fall thru */
1756         default:
1757                 return -EINVAL;
1758         }
1759
1760         /* get a frame */
1761         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1762         timestamp.tv_sec--;
1763         n = 2;
1764         for (;;) {
1765                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1766                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1767                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1768                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1769                 if (ret != 0) {
1770                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1771                         return ret;
1772                 }
1773
1774                 /* if the process slept for more than 1 second,
1775                  * get a newer frame */
1776                 frame = &gspca_dev->frame[v4l2_buf.index];
1777                 if (--n < 0)
1778                         break;                  /* avoid infinite loop */
1779                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1780                         break;
1781                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1782                 if (ret != 0) {
1783                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1784                         return ret;
1785                 }
1786         }
1787
1788         /* copy the frame */
1789         if (count > frame->v4l2_buf.bytesused)
1790                 count = frame->v4l2_buf.bytesused;
1791         ret = copy_to_user(data, frame->data, count);
1792         if (ret != 0) {
1793                 PDEBUG(D_ERR|D_STREAM,
1794                         "read cp to user lack %d / %zd", ret, count);
1795                 ret = -EFAULT;
1796                 goto out;
1797         }
1798         ret = count;
1799 out:
1800         /* in each case, requeue the buffer */
1801         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1802         if (ret2 != 0)
1803                 return ret2;
1804         return ret;
1805 }
1806
1807 static struct v4l2_file_operations dev_fops = {
1808         .owner = THIS_MODULE,
1809         .open = dev_open,
1810         .release = dev_close,
1811         .read = dev_read,
1812         .mmap = dev_mmap,
1813         .unlocked_ioctl = video_ioctl2,
1814         .poll   = dev_poll,
1815 };
1816
1817 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1818         .vidioc_querycap        = vidioc_querycap,
1819         .vidioc_dqbuf           = vidioc_dqbuf,
1820         .vidioc_qbuf            = vidioc_qbuf,
1821         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1822         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1823         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1824         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1825         .vidioc_streamon        = vidioc_streamon,
1826         .vidioc_queryctrl       = vidioc_queryctrl,
1827         .vidioc_g_ctrl          = vidioc_g_ctrl,
1828         .vidioc_s_ctrl          = vidioc_s_ctrl,
1829         .vidioc_g_audio         = vidioc_g_audio,
1830         .vidioc_s_audio         = vidioc_s_audio,
1831         .vidioc_enumaudio       = vidioc_enumaudio,
1832         .vidioc_querymenu       = vidioc_querymenu,
1833         .vidioc_enum_input      = vidioc_enum_input,
1834         .vidioc_g_input         = vidioc_g_input,
1835         .vidioc_s_input         = vidioc_s_input,
1836         .vidioc_reqbufs         = vidioc_reqbufs,
1837         .vidioc_querybuf        = vidioc_querybuf,
1838         .vidioc_streamoff       = vidioc_streamoff,
1839         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1840         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1841         .vidioc_g_parm          = vidioc_g_parm,
1842         .vidioc_s_parm          = vidioc_s_parm,
1843         .vidioc_s_std           = vidioc_s_std,
1844 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1845         .vidiocgmbuf          = vidiocgmbuf,
1846 #endif
1847 };
1848
1849 static struct video_device gspca_template = {
1850         .name = "gspca main driver",
1851         .fops = &dev_fops,
1852         .ioctl_ops = &dev_ioctl_ops,
1853         .release = gspca_release,
1854         .minor = -1,
1855 };
1856
1857 /*
1858  * probe and create a new gspca device
1859  *
1860  * This function must be called by the sub-driver when it is
1861  * called for probing a new device.
1862  */
1863 int gspca_dev_probe(struct usb_interface *intf,
1864                 const struct usb_device_id *id,
1865                 const struct sd_desc *sd_desc,
1866                 int dev_size,
1867                 struct module *module)
1868 {
1869         struct usb_interface_descriptor *interface;
1870         struct gspca_dev *gspca_dev;
1871         struct usb_device *dev = interface_to_usbdev(intf);
1872         int ret;
1873
1874         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1875
1876         /* we don't handle multi-config cameras */
1877         if (dev->descriptor.bNumConfigurations != 1)
1878                 return -ENODEV;
1879         interface = &intf->cur_altsetting->desc;
1880         if (interface->bInterfaceNumber > 0)
1881                 return -ENODEV;
1882
1883         /* create the device */
1884         if (dev_size < sizeof *gspca_dev)
1885                 dev_size = sizeof *gspca_dev;
1886         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1887         if (!gspca_dev) {
1888                 err("couldn't kzalloc gspca struct");
1889                 return -ENOMEM;
1890         }
1891         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1892         if (!gspca_dev->usb_buf) {
1893                 err("out of memory");
1894                 ret = -ENOMEM;
1895                 goto out;
1896         }
1897         gspca_dev->dev = dev;
1898         gspca_dev->iface = interface->bInterfaceNumber;
1899         gspca_dev->nbalt = intf->num_altsetting;
1900         gspca_dev->sd_desc = sd_desc;
1901         gspca_dev->nbufread = 2;
1902         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1903
1904         /* configure the subdriver and initialize the USB device */
1905         ret = sd_desc->config(gspca_dev, id);
1906         if (ret < 0)
1907                 goto out;
1908         ret = sd_desc->init(gspca_dev);
1909         if (ret < 0)
1910                 goto out;
1911         ret = gspca_set_alt0(gspca_dev);
1912         if (ret < 0)
1913                 goto out;
1914         gspca_set_default_mode(gspca_dev);
1915
1916         mutex_init(&gspca_dev->usb_lock);
1917         mutex_init(&gspca_dev->read_lock);
1918         mutex_init(&gspca_dev->queue_lock);
1919         init_waitqueue_head(&gspca_dev->wq);
1920
1921         /* init video stuff */
1922         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1923         gspca_dev->vdev.parent = &dev->dev;
1924         gspca_dev->module = module;
1925         gspca_dev->present = 1;
1926         ret = video_register_device(&gspca_dev->vdev,
1927                                   VFL_TYPE_GRABBER,
1928                                   video_nr);
1929         if (ret < 0) {
1930                 err("video_register_device err %d", ret);
1931                 goto out;
1932         }
1933
1934         usb_set_intfdata(intf, gspca_dev);
1935         PDEBUG(D_PROBE, "probe ok");
1936         return 0;
1937 out:
1938         kfree(gspca_dev->usb_buf);
1939         kfree(gspca_dev);
1940         return ret;
1941 }
1942 EXPORT_SYMBOL(gspca_dev_probe);
1943
1944 /*
1945  * USB disconnection
1946  *
1947  * This function must be called by the sub-driver
1948  * when the device disconnects, after the specific resources are freed.
1949  */
1950 void gspca_disconnect(struct usb_interface *intf)
1951 {
1952         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1953
1954         mutex_lock(&gspca_dev->usb_lock);
1955         gspca_dev->present = 0;
1956         mutex_unlock(&gspca_dev->usb_lock);
1957
1958         destroy_urbs(gspca_dev);
1959         gspca_dev->dev = NULL;
1960         usb_set_intfdata(intf, NULL);
1961
1962         /* release the device */
1963         /* (this will call gspca_release() immediatly or on last close) */
1964         video_unregister_device(&gspca_dev->vdev);
1965
1966         PDEBUG(D_PROBE, "disconnect complete");
1967 }
1968 EXPORT_SYMBOL(gspca_disconnect);
1969
1970 #ifdef CONFIG_PM
1971 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1972 {
1973         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1974
1975         if (!gspca_dev->streaming)
1976                 return 0;
1977         gspca_dev->frozen = 1;          /* avoid urb error messages */
1978         if (gspca_dev->sd_desc->stopN)
1979                 gspca_dev->sd_desc->stopN(gspca_dev);
1980         destroy_urbs(gspca_dev);
1981         gspca_set_alt0(gspca_dev);
1982         if (gspca_dev->sd_desc->stop0)
1983                 gspca_dev->sd_desc->stop0(gspca_dev);
1984         return 0;
1985 }
1986 EXPORT_SYMBOL(gspca_suspend);
1987
1988 int gspca_resume(struct usb_interface *intf)
1989 {
1990         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1991
1992         gspca_dev->frozen = 0;
1993         gspca_dev->sd_desc->init(gspca_dev);
1994         if (gspca_dev->streaming)
1995                 return gspca_init_transfer(gspca_dev);
1996         return 0;
1997 }
1998 EXPORT_SYMBOL(gspca_resume);
1999 #endif
2000 /* -- cam driver utility functions -- */
2001
2002 /* auto gain and exposure algorithm based on the knee algorithm described here:
2003    http://ytse.tricolour.net/docs/LowLightOptimization.html
2004
2005    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2006    where changed. */
2007 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2008         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2009 {
2010         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2011         const struct ctrl *gain_ctrl = NULL;
2012         const struct ctrl *exposure_ctrl = NULL;
2013         const struct ctrl *autogain_ctrl = NULL;
2014         int retval = 0;
2015
2016         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2017                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2018                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2019                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2020                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2021                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2022                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2023         }
2024         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2025                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2026                         "on cam without (auto)gain/exposure");
2027                 return 0;
2028         }
2029
2030         if (gain_ctrl->get(gspca_dev, &gain) ||
2031                         exposure_ctrl->get(gspca_dev, &exposure) ||
2032                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2033                 return 0;
2034
2035         orig_gain = gain;
2036         orig_exposure = exposure;
2037
2038         /* If we are of a multiple of deadzone, do multiple steps to reach the
2039            desired lumination fast (with the risc of a slight overshoot) */
2040         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2041
2042         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2043                 avg_lum, desired_avg_lum, steps);
2044
2045         for (i = 0; i < steps; i++) {
2046                 if (avg_lum > desired_avg_lum) {
2047                         if (gain > gain_knee)
2048                                 gain--;
2049                         else if (exposure > exposure_knee)
2050                                 exposure--;
2051                         else if (gain > gain_ctrl->qctrl.default_value)
2052                                 gain--;
2053                         else if (exposure > exposure_ctrl->qctrl.minimum)
2054                                 exposure--;
2055                         else if (gain > gain_ctrl->qctrl.minimum)
2056                                 gain--;
2057                         else
2058                                 break;
2059                 } else {
2060                         if (gain < gain_ctrl->qctrl.default_value)
2061                                 gain++;
2062                         else if (exposure < exposure_knee)
2063                                 exposure++;
2064                         else if (gain < gain_knee)
2065                                 gain++;
2066                         else if (exposure < exposure_ctrl->qctrl.maximum)
2067                                 exposure++;
2068                         else if (gain < gain_ctrl->qctrl.maximum)
2069                                 gain++;
2070                         else
2071                                 break;
2072                 }
2073         }
2074
2075         if (gain != orig_gain) {
2076                 gain_ctrl->set(gspca_dev, gain);
2077                 retval = 1;
2078         }
2079         if (exposure != orig_exposure) {
2080                 exposure_ctrl->set(gspca_dev, exposure);
2081                 retval = 1;
2082         }
2083
2084         return retval;
2085 }
2086 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2087
2088 /* -- module insert / remove -- */
2089 static int __init gspca_init(void)
2090 {
2091         info("main v%d.%d.%d registered",
2092                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2093                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2094                 DRIVER_VERSION_NUMBER & 0xff);
2095         return 0;
2096 }
2097 static void __exit gspca_exit(void)
2098 {
2099         info("main deregistered");
2100 }
2101
2102 module_init(gspca_init);
2103 module_exit(gspca_exit);
2104
2105 #ifdef GSPCA_DEBUG
2106 module_param_named(debug, gspca_debug, int, 0644);
2107 MODULE_PARM_DESC(debug,
2108                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2109                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2110                 " 0x0100: v4l2");
2111 #endif