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 3             /* default number of URBs */
  42 #if DEF_NURBS > MAX_NURBS
  43 #error "DEF_NURBS too big"
  44 #endif
  45
  46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 5, 0)
  51
  52 #ifdef GSPCA_DEBUG
  53 int gspca_debug = D_ERR | D_PROBE;
  54 EXPORT_SYMBOL(gspca_debug);
  55
  56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  57 {
  58         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  59                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  60                         txt,
  61                         pixfmt & 0xff,
  62                         (pixfmt >> 8) & 0xff,
  63                         (pixfmt >> 16) & 0xff,
  64                         pixfmt >> 24,
  65                         w, h);
  66         } else {
  67                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  68                         txt,
  69                         pixfmt,
  70                         w, h);
  71         }
  72 }
  73 #else
  74 #define PDEBUG_MODE(txt, pixfmt, w, h)
  75 #endif
  76
  77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  78 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  79 #define GSPCA_MEMORY_READ 7
  80
  81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  82
  83 /*
  84  * VMA operations.
  85  */
  86 static void gspca_vm_open(struct vm_area_struct *vma)
  87 {
  88         struct gspca_frame *frame = vma->vm_private_data;
  89
  90         frame->vma_use_count++;
  91         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  92 }
  93
  94 static void gspca_vm_close(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         if (--frame->vma_use_count <= 0)
  99                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static struct vm_operations_struct gspca_vm_ops = {
 103         .open           = gspca_vm_open,
 104         .close          = gspca_vm_close,
 105 };
 106
 107 /* get the current input frame buffer */
 108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 109 {
 110         struct gspca_frame *frame;
 111         int i;
 112
 113         i = gspca_dev->fr_i;
 114         i = gspca_dev->fr_queue[i];
 115         frame = &gspca_dev->frame[i];
 116         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 117                                 != V4L2_BUF_FLAG_QUEUED)
 118                 return NULL;
 119         return frame;
 120 }
 121 EXPORT_SYMBOL(gspca_get_i_frame);
 122
 123 /*
 124  * fill a video frame from an URB and resubmit
 125  */
 126 static void fill_frame(struct gspca_dev *gspca_dev,
 127                         struct urb *urb)
 128 {
 129         struct gspca_frame *frame;
 130         u8 *data;               /* address of data in the iso message */
 131         int i, len, st;
 132         cam_pkt_op pkt_scan;
 133
 134         if (urb->status != 0) {
 135                 if (urb->status == -ESHUTDOWN)
 136                         return;         /* disconnection */
 137 #ifdef CONFIG_PM
 138                 if (!gspca_dev->frozen)
 139 #endif
 140                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 141                 return;
 142         }
 143         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 144         for (i = 0; i < urb->number_of_packets; i++) {
 145
 146                 /* check the availability of the frame buffer */
 147                 frame = gspca_get_i_frame(gspca_dev);
 148                 if (!frame) {
 149                         gspca_dev->last_packet_type = DISCARD_PACKET;
 150                         break;
 151                 }
 152
 153                 /* check the packet status and length */
 154                 len = urb->iso_frame_desc[i].actual_length;
 155                 if (len == 0) {
 156                         if (gspca_dev->empty_packet == 0)
 157                                 gspca_dev->empty_packet = 1;
 158                         continue;
 159                 }
 160                 st = urb->iso_frame_desc[i].status;
 161                 if (st) {
 162                         PDEBUG(D_ERR,
 163                                 "ISOC data error: [%d] len=%d, status=%d",
 164                                 i, len, st);
 165                         gspca_dev->last_packet_type = DISCARD_PACKET;
 166                         continue;
 167                 }
 168
 169                 /* let the packet be analyzed by the subdriver */
 170                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 171                         i, urb->iso_frame_desc[i].offset, len);
 172                 data = (u8 *) urb->transfer_buffer
 173                                         + urb->iso_frame_desc[i].offset;
 174                 pkt_scan(gspca_dev, frame, data, len);
 175         }
 176
 177         /* resubmit the URB */
 178         st = usb_submit_urb(urb, GFP_ATOMIC);
 179         if (st < 0)
 180                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 181 }
 182
 183 /*
 184  * ISOC message interrupt from the USB device
 185  *
 186  * Analyse each packet and call the subdriver for copy to the frame buffer.
 187  */
 188 static void isoc_irq(struct urb *urb)
 189 {
 190         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 191
 192         PDEBUG(D_PACK, "isoc irq");
 193         if (!gspca_dev->streaming)
 194                 return;
 195         fill_frame(gspca_dev, urb);
 196 }
 197
 198 /*
 199  * bulk message interrupt from the USB device
 200  */
 201 static void bulk_irq(struct urb *urb)
 202 {
 203         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 204         struct gspca_frame *frame;
 205         int st;
 206
 207         PDEBUG(D_PACK, "bulk irq");
 208         if (!gspca_dev->streaming)
 209                 return;
 210         switch (urb->status) {
 211         case 0:
 212                 break;
 213         case -ESHUTDOWN:
 214                 return;         /* disconnection */
 215         case -ECONNRESET:
 216                 urb->status = 0;
 217                 break;
 218         default:
 219 #ifdef CONFIG_PM
 220                 if (!gspca_dev->frozen)
 221 #endif
 222                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 223                 return;
 224         }
 225
 226         /* check the availability of the frame buffer */
 227         frame = gspca_get_i_frame(gspca_dev);
 228         if (!frame) {
 229                 gspca_dev->last_packet_type = DISCARD_PACKET;
 230         } else {
 231                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 232                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 233                                         frame,
 234                                         urb->transfer_buffer,
 235                                         urb->actual_length);
 236         }
 237
 238         /* resubmit the URB */
 239         if (gspca_dev->cam.bulk_nurbs != 0) {
 240                 st = usb_submit_urb(urb, GFP_ATOMIC);
 241                 if (st < 0)
 242                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 243         }
 244 }
 245
 246 /*
 247  * add data to the current frame
 248  *
 249  * This function is called by the subdrivers at interrupt level.
 250  *
 251  * To build a frame, these ones must add
 252  *      - one FIRST_PACKET
 253  *      - 0 or many INTER_PACKETs
 254  *      - one LAST_PACKET
 255  * DISCARD_PACKET invalidates the whole frame.
 256  * On LAST_PACKET, a new frame is returned.
 257  */
 258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 259                                     enum gspca_packet_type packet_type,
 260                                     struct gspca_frame *frame,
 261                                     const __u8 *data,
 262                                     int len)
 263 {
 264         int i, j;
 265
 266         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 267
 268         /* when start of a new frame, if the current frame buffer
 269          * is not queued, discard the whole frame */
 270         if (packet_type == FIRST_PACKET) {
 271                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 272                                                 != V4L2_BUF_FLAG_QUEUED) {
 273                         gspca_dev->last_packet_type = DISCARD_PACKET;
 274                         return frame;
 275                 }
 276                 frame->data_end = frame->data;
 277                 jiffies_to_timeval(get_jiffies_64(),
 278                                    &frame->v4l2_buf.timestamp);
 279                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 280         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 281                 if (packet_type == LAST_PACKET)
 282                         gspca_dev->last_packet_type = packet_type;
 283                 return frame;
 284         }
 285
 286         /* append the packet to the frame buffer */
 287         if (len > 0) {
 288                 if (frame->data_end - frame->data + len
 289                                                  > frame->v4l2_buf.length) {
 290                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 291                                 frame->data_end - frame->data + len,
 292                                 frame->v4l2_buf.length);
 293                         packet_type = DISCARD_PACKET;
 294                 } else {
 295                         memcpy(frame->data_end, data, len);
 296                         frame->data_end += len;
 297                 }
 298         }
 299         gspca_dev->last_packet_type = packet_type;
 300
 301         /* if last packet, wake up the application and advance in the queue */
 302         if (packet_type == LAST_PACKET) {
 303                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 304                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 305                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 306                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 307                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 308                 gspca_dev->fr_i = i;
 309                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 310                         frame->v4l2_buf.bytesused,
 311                         gspca_dev->fr_q,
 312                         i,
 313                         gspca_dev->fr_o);
 314                 j = gspca_dev->fr_queue[i];
 315                 frame = &gspca_dev->frame[j];
 316         }
 317         return frame;
 318 }
 319 EXPORT_SYMBOL(gspca_frame_add);
 320
 321 static int gspca_is_compressed(__u32 format)
 322 {
 323         switch (format) {
 324         case V4L2_PIX_FMT_MJPEG:
 325         case V4L2_PIX_FMT_JPEG:
 326         case V4L2_PIX_FMT_SPCA561:
 327         case V4L2_PIX_FMT_PAC207:
 328         case V4L2_PIX_FMT_MR97310A:
 329                 return 1;
 330         }
 331         return 0;
 332 }
 333
 334 static void *rvmalloc(unsigned long size)
 335 {
 336         void *mem;
 337         unsigned long adr;
 338
 339         mem = vmalloc_32(size);
 340         if (mem != NULL) {
 341                 adr = (unsigned long) mem;
 342                 while ((long) size > 0) {
 343                         SetPageReserved(vmalloc_to_page((void *) adr));
 344                         adr += PAGE_SIZE;
 345                         size -= PAGE_SIZE;
 346                 }
 347         }
 348         return mem;
 349 }
 350
 351 static void rvfree(void *mem, long size)
 352 {
 353         unsigned long adr;
 354
 355         adr = (unsigned long) mem;
 356         while (size > 0) {
 357                 ClearPageReserved(vmalloc_to_page((void *) adr));
 358                 adr += PAGE_SIZE;
 359                 size -= PAGE_SIZE;
 360         }
 361         vfree(mem);
 362 }
 363
 364 static int frame_alloc(struct gspca_dev *gspca_dev,
 365                         unsigned int count)
 366 {
 367         struct gspca_frame *frame;
 368         unsigned int frsz;
 369         int i;
 370
 371         i = gspca_dev->curr_mode;
 372         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 373         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 374         frsz = PAGE_ALIGN(frsz);
 375         gspca_dev->frsz = frsz;
 376         if (count > GSPCA_MAX_FRAMES)
 377                 count = GSPCA_MAX_FRAMES;
 378         gspca_dev->frbuf = rvmalloc(frsz * count);
 379         if (!gspca_dev->frbuf) {
 380                 err("frame alloc failed");
 381                 return -ENOMEM;
 382         }
 383         gspca_dev->nframes = count;
 384         for (i = 0; i < count; i++) {
 385                 frame = &gspca_dev->frame[i];
 386                 frame->v4l2_buf.index = i;
 387                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 388                 frame->v4l2_buf.flags = 0;
 389                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 390                 frame->v4l2_buf.length = frsz;
 391                 frame->v4l2_buf.memory = gspca_dev->memory;
 392                 frame->v4l2_buf.sequence = 0;
 393                 frame->data = frame->data_end =
 394                                         gspca_dev->frbuf + i * frsz;
 395                 frame->v4l2_buf.m.offset = i * frsz;
 396         }
 397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 398         gspca_dev->last_packet_type = DISCARD_PACKET;
 399         gspca_dev->sequence = 0;
 400         return 0;
 401 }
 402
 403 static void frame_free(struct gspca_dev *gspca_dev)
 404 {
 405         int i;
 406
 407         PDEBUG(D_STREAM, "frame free");
 408         if (gspca_dev->frbuf != NULL) {
 409                 rvfree(gspca_dev->frbuf,
 410                         gspca_dev->nframes * gspca_dev->frsz);
 411                 gspca_dev->frbuf = NULL;
 412                 for (i = 0; i < gspca_dev->nframes; i++)
 413                         gspca_dev->frame[i].data = NULL;
 414         }
 415         gspca_dev->nframes = 0;
 416 }
 417
 418 static void destroy_urbs(struct gspca_dev *gspca_dev)
 419 {
 420         struct urb *urb;
 421         unsigned int i;
 422
 423         PDEBUG(D_STREAM, "kill transfer");
 424         for (i = 0; i < MAX_NURBS; i++) {
 425                 urb = gspca_dev->urb[i];
 426                 if (urb == NULL)
 427                         break;
 428
 429                 gspca_dev->urb[i] = NULL;
 430                 usb_kill_urb(urb);
 431                 if (urb->transfer_buffer != NULL)
 432                         usb_buffer_free(gspca_dev->dev,
 433                                         urb->transfer_buffer_length,
 434                                         urb->transfer_buffer,
 435                                         urb->transfer_dma);
 436                 usb_free_urb(urb);
 437         }
 438 }
 439
 440 /*
 441  * look for an input transfer endpoint in an alternate setting
 442  */
 443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 444                                           __u8 xfer)
 445 {
 446         struct usb_host_endpoint *ep;
 447         int i, attr;
 448
 449         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 450                 ep = &alt->endpoint[i];
 451                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 452                 if (attr == xfer)
 453                         return ep;
 454         }
 455         return NULL;
 456 }
 457
 458 /*
 459  * look for an input (isoc or bulk) endpoint
 460  *
 461  * The endpoint is defined by the subdriver.
 462  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 463  * This routine may be called many times when the bandwidth is too small
 464  * (the bandwidth is checked on urb submit).
 465  */
 466 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 467 {
 468         struct usb_interface *intf;
 469         struct usb_host_endpoint *ep;
 470         int i, ret;
 471
 472         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 473         ep = NULL;
 474         i = gspca_dev->alt;                     /* previous alt setting */
 475
 476         /* try isoc */
 477         while (--i >= 0) {
 478                 ep = alt_xfer(&intf->altsetting[i],
 479                                 USB_ENDPOINT_XFER_ISOC);
 480                 if (ep)
 481                         break;
 482         }
 483
 484         /* if no isoc, try bulk (alt 0 only) */
 485         if (ep == NULL) {
 486                 ep = alt_xfer(&intf->altsetting[0],
 487                                 USB_ENDPOINT_XFER_BULK);
 488                 if (ep == NULL) {
 489                         err("no transfer endpoint found");
 490                         return NULL;
 491                 }
 492                 i = 0;
 493                 gspca_dev->bulk = 1;
 494         }
 495         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 496                         i, ep->desc.bEndpointAddress);
 497         if (i > 0) {
 498                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 499                 if (ret < 0) {
 500                         err("set interface err %d", ret);
 501                         return NULL;
 502                 }
 503         }
 504         gspca_dev->alt = i;             /* memorize the current alt setting */
 505         return ep;
 506 }
 507
 508 /*
 509  * create the URBs for image transfer
 510  */
 511 static int create_urbs(struct gspca_dev *gspca_dev,
 512                         struct usb_host_endpoint *ep)
 513 {
 514         struct urb *urb;
 515         int n, nurbs, i, psize, npkt, bsize;
 516
 517         /* calculate the packet size and the number of packets */
 518         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 519
 520         if (!gspca_dev->bulk) {                 /* isoc */
 521
 522                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 523                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 524                 npkt = ISO_MAX_SIZE / psize;
 525                 if (npkt > ISO_MAX_PKT)
 526                         npkt = ISO_MAX_PKT;
 527                 bsize = psize * npkt;
 528                 PDEBUG(D_STREAM,
 529                         "isoc %d pkts size %d = bsize:%d",
 530                         npkt, psize, bsize);
 531                 nurbs = DEF_NURBS;
 532         } else {                                /* bulk */
 533                 npkt = 0;
 534                 bsize = gspca_dev->cam.bulk_size;
 535                 if (bsize == 0)
 536                         bsize = psize;
 537                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 538                 if (gspca_dev->cam.bulk_nurbs != 0)
 539                         nurbs = gspca_dev->cam.bulk_nurbs;
 540                 else
 541                         nurbs = 1;
 542         }
 543
 544         gspca_dev->nurbs = nurbs;
 545         for (n = 0; n < nurbs; n++) {
 546                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 547                 if (!urb) {
 548                         err("usb_alloc_urb failed");
 549                         destroy_urbs(gspca_dev);
 550                         return -ENOMEM;
 551                 }
 552                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 553                                                 bsize,
 554                                                 GFP_KERNEL,
 555                                                 &urb->transfer_dma);
 556
 557                 if (urb->transfer_buffer == NULL) {
 558                         usb_free_urb(urb);
 559                         err("usb_buffer_urb failed");
 560                         destroy_urbs(gspca_dev);
 561                         return -ENOMEM;
 562                 }
 563                 gspca_dev->urb[n] = urb;
 564                 urb->dev = gspca_dev->dev;
 565                 urb->context = gspca_dev;
 566                 urb->transfer_buffer_length = bsize;
 567                 if (npkt != 0) {                /* ISOC */
 568                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 569                                                     ep->desc.bEndpointAddress);
 570                         urb->transfer_flags = URB_ISO_ASAP
 571                                         | URB_NO_TRANSFER_DMA_MAP;
 572                         urb->interval = ep->desc.bInterval;
 573                         urb->complete = isoc_irq;
 574                         urb->number_of_packets = npkt;
 575                         for (i = 0; i < npkt; i++) {
 576                                 urb->iso_frame_desc[i].length = psize;
 577                                 urb->iso_frame_desc[i].offset = psize * i;
 578                         }
 579                 } else {                /* bulk */
 580                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 581                                                 ep->desc.bEndpointAddress),
 582                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 583                         urb->complete = bulk_irq;
 584                 }
 585         }
 586         return 0;
 587 }
 588
 589 /*
 590  * start the USB transfer
 591  */
 592 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 593 {
 594         struct usb_host_endpoint *ep;
 595         int n, ret;
 596
 597         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 598                 return -ERESTARTSYS;
 599
 600         if (!gspca_dev->present) {
 601                 ret = -ENODEV;
 602                 goto out;
 603         }
 604
 605         /* set the higher alternate setting and
 606          * loop until urb submit succeeds */
 607         gspca_dev->alt = gspca_dev->nbalt;
 608         for (;;) {
 609                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 610                 ep = get_ep(gspca_dev);
 611                 if (ep == NULL) {
 612                         ret = -EIO;
 613                         goto out;
 614                 }
 615                 ret = create_urbs(gspca_dev, ep);
 616                 if (ret < 0)
 617                         goto out;
 618
 619                 /* clear the bulk endpoint */
 620                 if (gspca_dev->bulk)
 621                         usb_clear_halt(gspca_dev->dev,
 622                                         gspca_dev->urb[0]->pipe);
 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->bulk && 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                 if (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         }
 680
 681         /* always call stop0 to free the subdriver's resources */
 682         if (gspca_dev->sd_desc->stop0)
 683                 gspca_dev->sd_desc->stop0(gspca_dev);
 684         PDEBUG(D_STREAM, "stream off OK");
 685 }
 686
 687 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 688 {
 689         int i;
 690
 691         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 692         gspca_dev->curr_mode = i;
 693         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 694         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 695         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 696 }
 697
 698 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 699                         int width, int height)
 700 {
 701         int i;
 702
 703         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 704                 if (width >= gspca_dev->cam.cam_mode[i].width
 705                     && height >= gspca_dev->cam.cam_mode[i].height)
 706                         break;
 707         }
 708         return i;
 709 }
 710
 711 /*
 712  * search a mode with the right pixel format
 713  */
 714 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 715                         int mode,
 716                         int pixfmt)
 717 {
 718         int modeU, modeD;
 719
 720         modeU = modeD = mode;
 721         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 722                 if (--modeD >= 0) {
 723                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 724                                                                 == pixfmt)
 725                                 return modeD;
 726                 }
 727                 if (++modeU < gspca_dev->cam.nmodes) {
 728                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 729                                                                 == pixfmt)
 730                                 return modeU;
 731                 }
 732         }
 733         return -EINVAL;
 734 }
 735
 736 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 737                                 struct v4l2_fmtdesc *fmtdesc)
 738 {
 739         struct gspca_dev *gspca_dev = priv;
 740         int i, j, index;
 741         __u32 fmt_tb[8];
 742
 743         /* give an index to each format */
 744         index = 0;
 745         j = 0;
 746         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 747                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 748                 j = 0;
 749                 for (;;) {
 750                         if (fmt_tb[j] == fmt_tb[index])
 751                                 break;
 752                         j++;
 753                 }
 754                 if (j == index) {
 755                         if (fmtdesc->index == index)
 756                                 break;          /* new format */
 757                         index++;
 758                         if (index >= ARRAY_SIZE(fmt_tb))
 759                                 return -EINVAL;
 760                 }
 761         }
 762         if (i < 0)
 763                 return -EINVAL;         /* no more format */
 764
 765         fmtdesc->pixelformat = fmt_tb[index];
 766         if (gspca_is_compressed(fmt_tb[index]))
 767                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 768         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 769         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 770         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 771         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 772         fmtdesc->description[4] = '\0';
 773         return 0;
 774 }
 775
 776 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 777                             struct v4l2_format *fmt)
 778 {
 779         struct gspca_dev *gspca_dev = priv;
 780         int mode;
 781
 782         mode = gspca_dev->curr_mode;
 783         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 784                 sizeof fmt->fmt.pix);
 785         return 0;
 786 }
 787
 788 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 789                         struct v4l2_format *fmt)
 790 {
 791         int w, h, mode, mode2;
 792
 793         w = fmt->fmt.pix.width;
 794         h = fmt->fmt.pix.height;
 795
 796 #ifdef GSPCA_DEBUG
 797         if (gspca_debug & D_CONF)
 798                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 799 #endif
 800         /* search the closest mode for width and height */
 801         mode = wxh_to_mode(gspca_dev, w, h);
 802
 803         /* OK if right palette */
 804         if (gspca_dev->cam.cam_mode[mode].pixelformat
 805                                                 != fmt->fmt.pix.pixelformat) {
 806
 807                 /* else, search the closest mode with the same pixel format */
 808                 mode2 = gspca_get_mode(gspca_dev, mode,
 809                                         fmt->fmt.pix.pixelformat);
 810                 if (mode2 >= 0)
 811                         mode = mode2;
 812 /*              else
 813                         ;                * no chance, return this mode */
 814         }
 815         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 816                 sizeof fmt->fmt.pix);
 817         return mode;                    /* used when s_fmt */
 818 }
 819
 820 static int vidioc_try_fmt_vid_cap(struct file *file,
 821                               void *priv,
 822                               struct v4l2_format *fmt)
 823 {
 824         struct gspca_dev *gspca_dev = priv;
 825         int ret;
 826
 827         ret = try_fmt_vid_cap(gspca_dev, fmt);
 828         if (ret < 0)
 829                 return ret;
 830         return 0;
 831 }
 832
 833 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 834                             struct v4l2_format *fmt)
 835 {
 836         struct gspca_dev *gspca_dev = priv;
 837         int ret;
 838
 839         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 840                 return -ERESTARTSYS;
 841
 842         ret = try_fmt_vid_cap(gspca_dev, fmt);
 843         if (ret < 0)
 844                 goto out;
 845
 846         if (gspca_dev->nframes != 0
 847             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 848                 ret = -EINVAL;
 849                 goto out;
 850         }
 851
 852         if (ret == gspca_dev->curr_mode) {
 853                 ret = 0;
 854                 goto out;                       /* same mode */
 855         }
 856
 857         if (gspca_dev->streaming) {
 858                 ret = -EBUSY;
 859                 goto out;
 860         }
 861         gspca_dev->width = fmt->fmt.pix.width;
 862         gspca_dev->height = fmt->fmt.pix.height;
 863         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 864         gspca_dev->curr_mode = ret;
 865
 866         ret = 0;
 867 out:
 868         mutex_unlock(&gspca_dev->queue_lock);
 869         return ret;
 870 }
 871
 872 static void gspca_release(struct video_device *vfd)
 873 {
 874         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 875
 876         PDEBUG(D_STREAM, "device released");
 877
 878         kfree(gspca_dev->usb_buf);
 879         kfree(gspca_dev);
 880 }
 881
 882 static int dev_open(struct file *file)
 883 {
 884         struct gspca_dev *gspca_dev;
 885         int ret;
 886
 887         PDEBUG(D_STREAM, "%s open", current->comm);
 888         gspca_dev = (struct gspca_dev *) video_devdata(file);
 889         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 890                 return -ERESTARTSYS;
 891         if (!gspca_dev->present) {
 892                 ret = -ENODEV;
 893                 goto out;
 894         }
 895
 896         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 897                 ret = -EBUSY;
 898                 goto out;
 899         }
 900
 901         /* protect the subdriver against rmmod */
 902         if (!try_module_get(gspca_dev->module)) {
 903                 ret = -ENODEV;
 904                 goto out;
 905         }
 906
 907         gspca_dev->users++;
 908
 909         file->private_data = gspca_dev;
 910 #ifdef GSPCA_DEBUG
 911         /* activate the v4l2 debug */
 912         if (gspca_debug & D_V4L2)
 913                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 914                                         | V4L2_DEBUG_IOCTL_ARG;
 915         else
 916                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 917                                         | V4L2_DEBUG_IOCTL_ARG);
 918 #endif
 919         ret = 0;
 920 out:
 921         mutex_unlock(&gspca_dev->queue_lock);
 922         if (ret != 0)
 923                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 924         else
 925                 PDEBUG(D_STREAM, "open done");
 926         return ret;
 927 }
 928
 929 static int dev_close(struct file *file)
 930 {
 931         struct gspca_dev *gspca_dev = file->private_data;
 932
 933         PDEBUG(D_STREAM, "%s close", current->comm);
 934         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 935                 return -ERESTARTSYS;
 936         gspca_dev->users--;
 937
 938         /* if the file did the capture, free the streaming resources */
 939         if (gspca_dev->capt_file == file) {
 940                 if (gspca_dev->streaming) {
 941                         mutex_lock(&gspca_dev->usb_lock);
 942                         gspca_stream_off(gspca_dev);
 943                         mutex_unlock(&gspca_dev->usb_lock);
 944                 }
 945                 frame_free(gspca_dev);
 946                 gspca_dev->capt_file = NULL;
 947                 gspca_dev->memory = GSPCA_MEMORY_NO;
 948         }
 949         file->private_data = NULL;
 950         module_put(gspca_dev->module);
 951         mutex_unlock(&gspca_dev->queue_lock);
 952
 953         PDEBUG(D_STREAM, "close done");
 954
 955         return 0;
 956 }
 957
 958 static int vidioc_querycap(struct file *file, void  *priv,
 959                            struct v4l2_capability *cap)
 960 {
 961         struct gspca_dev *gspca_dev = priv;
 962         int ret;
 963
 964         /* protect the access to the usb device */
 965         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 966                 return -ERESTARTSYS;
 967         if (!gspca_dev->present) {
 968                 ret = -ENODEV;
 969                 goto out;
 970         }
 971         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 972         if (gspca_dev->dev->product != NULL) {
 973                 strncpy(cap->card, gspca_dev->dev->product,
 974                         sizeof cap->card);
 975         } else {
 976                 snprintf(cap->card, sizeof cap->card,
 977                         "USB Camera (%04x:%04x)",
 978                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 979                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 980         }
 981         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
 982         cap->version = DRIVER_VERSION_NUMBER;
 983         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 984                           | V4L2_CAP_STREAMING
 985                           | V4L2_CAP_READWRITE;
 986         ret = 0;
 987 out:
 988         mutex_unlock(&gspca_dev->usb_lock);
 989         return ret;
 990 }
 991
 992 static int vidioc_queryctrl(struct file *file, void *priv,
 993                            struct v4l2_queryctrl *q_ctrl)
 994 {
 995         struct gspca_dev *gspca_dev = priv;
 996         int i, ix;
 997         u32 id;
 998
 999         ix = -1;
1000         id = q_ctrl->id;
1001         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1002                 id &= V4L2_CTRL_ID_MASK;
1003                 id++;
1004                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1005                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1006                                 continue;
1007                         if (ix < 0) {
1008                                 ix = i;
1009                                 continue;
1010                         }
1011                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1012                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1013                                 continue;
1014                         ix = i;
1015                 }
1016         }
1017         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1018                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1019                         ix = i;
1020                         break;
1021                 }
1022         }
1023         if (ix < 0)
1024                 return -EINVAL;
1025         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1026                 sizeof *q_ctrl);
1027         if (gspca_dev->ctrl_dis & (1 << ix))
1028                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1029         return 0;
1030 }
1031
1032 static int vidioc_s_ctrl(struct file *file, void *priv,
1033                          struct v4l2_control *ctrl)
1034 {
1035         struct gspca_dev *gspca_dev = priv;
1036         const struct ctrl *ctrls;
1037         int i, ret;
1038
1039         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1040              i < gspca_dev->sd_desc->nctrls;
1041              i++, ctrls++) {
1042                 if (ctrl->id != ctrls->qctrl.id)
1043                         continue;
1044                 if (gspca_dev->ctrl_dis & (1 << i))
1045                         return -EINVAL;
1046                 if (ctrl->value < ctrls->qctrl.minimum
1047                     || ctrl->value > ctrls->qctrl.maximum)
1048                         return -ERANGE;
1049                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1050                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1051                         return -ERESTARTSYS;
1052                 if (gspca_dev->present)
1053                         ret = ctrls->set(gspca_dev, ctrl->value);
1054                 else
1055                         ret = -ENODEV;
1056                 mutex_unlock(&gspca_dev->usb_lock);
1057                 return ret;
1058         }
1059         return -EINVAL;
1060 }
1061
1062 static int vidioc_g_ctrl(struct file *file, void *priv,
1063                          struct v4l2_control *ctrl)
1064 {
1065         struct gspca_dev *gspca_dev = priv;
1066
1067         const struct ctrl *ctrls;
1068         int i, ret;
1069
1070         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1071              i < gspca_dev->sd_desc->nctrls;
1072              i++, ctrls++) {
1073                 if (ctrl->id != ctrls->qctrl.id)
1074                         continue;
1075                 if (gspca_dev->ctrl_dis & (1 << i))
1076                         return -EINVAL;
1077                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1078                         return -ERESTARTSYS;
1079                 if (gspca_dev->present)
1080                         ret = ctrls->get(gspca_dev, &ctrl->value);
1081                 else
1082                         ret = -ENODEV;
1083                 mutex_unlock(&gspca_dev->usb_lock);
1084                 return ret;
1085         }
1086         return -EINVAL;
1087 }
1088
1089 /*fixme: have an audio flag in gspca_dev?*/
1090 static int vidioc_s_audio(struct file *file, void *priv,
1091                          struct v4l2_audio *audio)
1092 {
1093         if (audio->index != 0)
1094                 return -EINVAL;
1095         return 0;
1096 }
1097
1098 static int vidioc_g_audio(struct file *file, void *priv,
1099                          struct v4l2_audio *audio)
1100 {
1101         strcpy(audio->name, "Microphone");
1102         return 0;
1103 }
1104
1105 static int vidioc_enumaudio(struct file *file, void *priv,
1106                          struct v4l2_audio *audio)
1107 {
1108         if (audio->index != 0)
1109                 return -EINVAL;
1110
1111         strcpy(audio->name, "Microphone");
1112         audio->capability = 0;
1113         audio->mode = 0;
1114         return 0;
1115 }
1116
1117 static int vidioc_querymenu(struct file *file, void *priv,
1118                             struct v4l2_querymenu *qmenu)
1119 {
1120         struct gspca_dev *gspca_dev = priv;
1121
1122         if (!gspca_dev->sd_desc->querymenu)
1123                 return -EINVAL;
1124         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1125 }
1126
1127 static int vidioc_enum_input(struct file *file, void *priv,
1128                                 struct v4l2_input *input)
1129 {
1130         struct gspca_dev *gspca_dev = priv;
1131
1132         if (input->index != 0)
1133                 return -EINVAL;
1134         input->type = V4L2_INPUT_TYPE_CAMERA;
1135         input->status = gspca_dev->cam.input_flags;
1136         strncpy(input->name, gspca_dev->sd_desc->name,
1137                 sizeof input->name);
1138         return 0;
1139 }
1140
1141 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1142 {
1143         *i = 0;
1144         return 0;
1145 }
1146
1147 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1148 {
1149         if (i > 0)
1150                 return -EINVAL;
1151         return (0);
1152 }
1153
1154 static int vidioc_reqbufs(struct file *file, void *priv,
1155                           struct v4l2_requestbuffers *rb)
1156 {
1157         struct gspca_dev *gspca_dev = priv;
1158         int i, ret = 0;
1159
1160         switch (rb->memory) {
1161         case GSPCA_MEMORY_READ:                 /* (internal call) */
1162         case V4L2_MEMORY_MMAP:
1163         case V4L2_MEMORY_USERPTR:
1164                 break;
1165         default:
1166                 return -EINVAL;
1167         }
1168         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1169                 return -ERESTARTSYS;
1170
1171         if (gspca_dev->memory != GSPCA_MEMORY_NO
1172             && gspca_dev->memory != rb->memory) {
1173                 ret = -EBUSY;
1174                 goto out;
1175         }
1176
1177         /* only one file may do the capture */
1178         if (gspca_dev->capt_file != NULL
1179             && gspca_dev->capt_file != file) {
1180                 ret = -EBUSY;
1181                 goto out;
1182         }
1183
1184         /* if allocated, the buffers must not be mapped */
1185         for (i = 0; i < gspca_dev->nframes; i++) {
1186                 if (gspca_dev->frame[i].vma_use_count) {
1187                         ret = -EBUSY;
1188                         goto out;
1189                 }
1190         }
1191
1192         /* stop streaming */
1193         if (gspca_dev->streaming) {
1194                 mutex_lock(&gspca_dev->usb_lock);
1195                 gspca_stream_off(gspca_dev);
1196                 mutex_unlock(&gspca_dev->usb_lock);
1197         }
1198
1199         /* free the previous allocated buffers, if any */
1200         if (gspca_dev->nframes != 0) {
1201                 frame_free(gspca_dev);
1202                 gspca_dev->capt_file = NULL;
1203         }
1204         if (rb->count == 0)                     /* unrequest */
1205                 goto out;
1206         gspca_dev->memory = rb->memory;
1207         ret = frame_alloc(gspca_dev, rb->count);
1208         if (ret == 0) {
1209                 rb->count = gspca_dev->nframes;
1210                 gspca_dev->capt_file = file;
1211         }
1212 out:
1213         mutex_unlock(&gspca_dev->queue_lock);
1214         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1215         return ret;
1216 }
1217
1218 static int vidioc_querybuf(struct file *file, void *priv,
1219                            struct v4l2_buffer *v4l2_buf)
1220 {
1221         struct gspca_dev *gspca_dev = priv;
1222         struct gspca_frame *frame;
1223
1224         if (v4l2_buf->index < 0
1225             || v4l2_buf->index >= gspca_dev->nframes)
1226                 return -EINVAL;
1227
1228         frame = &gspca_dev->frame[v4l2_buf->index];
1229         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1230         return 0;
1231 }
1232
1233 static int vidioc_streamon(struct file *file, void *priv,
1234                            enum v4l2_buf_type buf_type)
1235 {
1236         struct gspca_dev *gspca_dev = priv;
1237         int ret;
1238
1239         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1240                 return -EINVAL;
1241         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1242                 return -ERESTARTSYS;
1243
1244         if (gspca_dev->nframes == 0
1245             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1246                 ret = -EINVAL;
1247                 goto out;
1248         }
1249         if (!gspca_dev->streaming) {
1250                 ret = gspca_init_transfer(gspca_dev);
1251                 if (ret < 0)
1252                         goto out;
1253         }
1254 #ifdef GSPCA_DEBUG
1255         if (gspca_debug & D_STREAM) {
1256                 PDEBUG_MODE("stream on OK",
1257                         gspca_dev->pixfmt,
1258                         gspca_dev->width,
1259                         gspca_dev->height);
1260         }
1261 #endif
1262         ret = 0;
1263 out:
1264         mutex_unlock(&gspca_dev->queue_lock);
1265         return ret;
1266 }
1267
1268 static int vidioc_streamoff(struct file *file, void *priv,
1269                                 enum v4l2_buf_type buf_type)
1270 {
1271         struct gspca_dev *gspca_dev = priv;
1272         int i, ret;
1273
1274         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1275                 return -EINVAL;
1276         if (!gspca_dev->streaming)
1277                 return 0;
1278         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1279                 return -ERESTARTSYS;
1280
1281         /* stop streaming */
1282         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1283                 ret = -ERESTARTSYS;
1284                 goto out;
1285         }
1286         gspca_stream_off(gspca_dev);
1287         mutex_unlock(&gspca_dev->usb_lock);
1288
1289         /* empty the application queues */
1290         for (i = 0; i < gspca_dev->nframes; i++)
1291                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1292         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1293         gspca_dev->last_packet_type = DISCARD_PACKET;
1294         gspca_dev->sequence = 0;
1295         ret = 0;
1296 out:
1297         mutex_unlock(&gspca_dev->queue_lock);
1298         return ret;
1299 }
1300
1301 static int vidioc_g_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->get_jcomp)
1308                 return -EINVAL;
1309         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1310                 return -ERESTARTSYS;
1311         if (gspca_dev->present)
1312                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1313         else
1314                 ret = -ENODEV;
1315         mutex_unlock(&gspca_dev->usb_lock);
1316         return ret;
1317 }
1318
1319 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1320                         struct v4l2_jpegcompression *jpegcomp)
1321 {
1322         struct gspca_dev *gspca_dev = priv;
1323         int ret;
1324
1325         if (!gspca_dev->sd_desc->set_jcomp)
1326                 return -EINVAL;
1327         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1328                 return -ERESTARTSYS;
1329         if (gspca_dev->present)
1330                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1331         else
1332                 ret = -ENODEV;
1333         mutex_unlock(&gspca_dev->usb_lock);
1334         return ret;
1335 }
1336
1337 static int vidioc_g_parm(struct file *filp, void *priv,
1338                         struct v4l2_streamparm *parm)
1339 {
1340         struct gspca_dev *gspca_dev = priv;
1341
1342         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1343
1344         if (gspca_dev->sd_desc->get_streamparm) {
1345                 int ret;
1346
1347                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1348                         return -ERESTARTSYS;
1349                 if (gspca_dev->present)
1350                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1351                                                                  parm);
1352                 else
1353                         ret = -ENODEV;
1354                 mutex_unlock(&gspca_dev->usb_lock);
1355                 return ret;
1356         }
1357
1358         return 0;
1359 }
1360
1361 static int vidioc_s_parm(struct file *filp, void *priv,
1362                         struct v4l2_streamparm *parm)
1363 {
1364         struct gspca_dev *gspca_dev = priv;
1365         int n;
1366
1367         n = parm->parm.capture.readbuffers;
1368         if (n == 0 || n > GSPCA_MAX_FRAMES)
1369                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1370         else
1371                 gspca_dev->nbufread = n;
1372
1373         if (gspca_dev->sd_desc->set_streamparm) {
1374                 int ret;
1375
1376                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1377                         return -ERESTARTSYS;
1378                 if (gspca_dev->present)
1379                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1380                                                                  parm);
1381                 else
1382                         ret = -ENODEV;
1383                 mutex_unlock(&gspca_dev->usb_lock);
1384                 return ret;
1385         }
1386
1387         return 0;
1388 }
1389
1390 static int vidioc_s_std(struct file *filp, void *priv,
1391                         v4l2_std_id *parm)
1392 {
1393         return 0;
1394 }
1395
1396 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1397 static int vidiocgmbuf(struct file *file, void *priv,
1398                         struct video_mbuf *mbuf)
1399 {
1400         struct gspca_dev *gspca_dev = file->private_data;
1401         int i;
1402
1403         PDEBUG(D_STREAM, "cgmbuf");
1404         if (gspca_dev->nframes == 0) {
1405                 int ret;
1406
1407                 {
1408                         struct v4l2_format fmt;
1409
1410                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1411                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1412                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1413                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1414                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1415                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1416                         if (ret != 0)
1417                                 return ret;
1418                 }
1419                 {
1420                         struct v4l2_requestbuffers rb;
1421
1422                         memset(&rb, 0, sizeof rb);
1423                         rb.count = 4;
1424                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1425                         rb.memory = V4L2_MEMORY_MMAP;
1426                         ret = vidioc_reqbufs(file, priv, &rb);
1427                         if (ret != 0)
1428                                 return ret;
1429                 }
1430         }
1431         mbuf->frames = gspca_dev->nframes;
1432         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1433         for (i = 0; i < mbuf->frames; i++)
1434                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1435         return 0;
1436 }
1437 #endif
1438
1439 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1440 {
1441         struct gspca_dev *gspca_dev = file->private_data;
1442         struct gspca_frame *frame;
1443         struct page *page;
1444         unsigned long addr, start, size;
1445         int i, ret;
1446
1447         start = vma->vm_start;
1448         size = vma->vm_end - vma->vm_start;
1449         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1450
1451         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1452                 return -ERESTARTSYS;
1453         if (!gspca_dev->present) {
1454                 ret = -ENODEV;
1455                 goto out;
1456         }
1457         if (gspca_dev->capt_file != file) {
1458                 ret = -EINVAL;
1459                 goto out;
1460         }
1461
1462         frame = NULL;
1463         for (i = 0; i < gspca_dev->nframes; ++i) {
1464                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1465                         PDEBUG(D_STREAM, "mmap bad memory type");
1466                         break;
1467                 }
1468                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1469                                                 == vma->vm_pgoff) {
1470                         frame = &gspca_dev->frame[i];
1471                         break;
1472                 }
1473         }
1474         if (frame == NULL) {
1475                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1476                 ret = -EINVAL;
1477                 goto out;
1478         }
1479 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1480         /* v4l1 maps all the buffers */
1481         if (i != 0
1482             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1483 #endif
1484             if (size != frame->v4l2_buf.length) {
1485                 PDEBUG(D_STREAM, "mmap bad size");
1486                 ret = -EINVAL;
1487                 goto out;
1488         }
1489
1490         /*
1491          * - VM_IO marks the area as being a mmaped region for I/O to a
1492          *   device. It also prevents the region from being core dumped.
1493          */
1494         vma->vm_flags |= VM_IO;
1495
1496         addr = (unsigned long) frame->data;
1497         while (size > 0) {
1498                 page = vmalloc_to_page((void *) addr);
1499                 ret = vm_insert_page(vma, start, page);
1500                 if (ret < 0)
1501                         goto out;
1502                 start += PAGE_SIZE;
1503                 addr += PAGE_SIZE;
1504                 size -= PAGE_SIZE;
1505         }
1506
1507         vma->vm_ops = &gspca_vm_ops;
1508         vma->vm_private_data = frame;
1509         gspca_vm_open(vma);
1510         ret = 0;
1511 out:
1512         mutex_unlock(&gspca_dev->queue_lock);
1513         return ret;
1514 }
1515
1516 /*
1517  * wait for a video frame
1518  *
1519  * If a frame is ready, its index is returned.
1520  */
1521 static int frame_wait(struct gspca_dev *gspca_dev,
1522                         int nonblock_ing)
1523 {
1524         struct gspca_frame *frame;
1525         int i, j, ret;
1526
1527         /* check if a frame is ready */
1528         i = gspca_dev->fr_o;
1529         j = gspca_dev->fr_queue[i];
1530         frame = &gspca_dev->frame[j];
1531
1532         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1533                 if (nonblock_ing)
1534                         return -EAGAIN;
1535
1536                 /* wait till a frame is ready */
1537                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1538                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1539                         !gspca_dev->streaming || !gspca_dev->present,
1540                         msecs_to_jiffies(3000));
1541                 if (ret < 0)
1542                         return ret;
1543                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1544                         return -EIO;
1545         }
1546
1547         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1548         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1549                 gspca_dev->fr_q,
1550                 gspca_dev->fr_i,
1551                 gspca_dev->fr_o);
1552
1553         if (gspca_dev->sd_desc->dq_callback) {
1554                 mutex_lock(&gspca_dev->usb_lock);
1555                 if (gspca_dev->present)
1556                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1557                 mutex_unlock(&gspca_dev->usb_lock);
1558         }
1559         return j;
1560 }
1561
1562 /*
1563  * dequeue a video buffer
1564  *
1565  * If nonblock_ing is false, block until a buffer is available.
1566  */
1567 static int vidioc_dqbuf(struct file *file, void *priv,
1568                         struct v4l2_buffer *v4l2_buf)
1569 {
1570         struct gspca_dev *gspca_dev = priv;
1571         struct gspca_frame *frame;
1572         int i, ret;
1573
1574         PDEBUG(D_FRAM, "dqbuf");
1575         if (v4l2_buf->memory != gspca_dev->memory)
1576                 return -EINVAL;
1577
1578         if (!gspca_dev->present)
1579                 return -ENODEV;
1580
1581         /* if not streaming, be sure the application will not loop forever */
1582         if (!(file->f_flags & O_NONBLOCK)
1583             && !gspca_dev->streaming && gspca_dev->users == 1)
1584                 return -EINVAL;
1585
1586         /* only the capturing file may dequeue */
1587         if (gspca_dev->capt_file != file)
1588                 return -EINVAL;
1589
1590         /* only one dequeue / read at a time */
1591         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1592                 return -ERESTARTSYS;
1593
1594         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1595         if (ret < 0)
1596                 goto out;
1597         i = ret;                                /* frame index */
1598         frame = &gspca_dev->frame[i];
1599         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1600                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1601                                  frame->data,
1602                                  frame->v4l2_buf.bytesused)) {
1603                         PDEBUG(D_ERR|D_STREAM,
1604                                 "dqbuf cp to user failed");
1605                         ret = -EFAULT;
1606                         goto out;
1607                 }
1608         }
1609         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1610         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1611         PDEBUG(D_FRAM, "dqbuf %d", i);
1612         ret = 0;
1613 out:
1614         mutex_unlock(&gspca_dev->read_lock);
1615         return ret;
1616 }
1617
1618 /*
1619  * queue a video buffer
1620  *
1621  * Attempting to queue a buffer that has already been
1622  * queued will return -EINVAL.
1623  */
1624 static int vidioc_qbuf(struct file *file, void *priv,
1625                         struct v4l2_buffer *v4l2_buf)
1626 {
1627         struct gspca_dev *gspca_dev = priv;
1628         struct gspca_frame *frame;
1629         int i, index, ret;
1630
1631         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1632
1633         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1634                 return -ERESTARTSYS;
1635
1636         index = v4l2_buf->index;
1637         if ((unsigned) index >= gspca_dev->nframes) {
1638                 PDEBUG(D_FRAM,
1639                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1640                 ret = -EINVAL;
1641                 goto out;
1642         }
1643         if (v4l2_buf->memory != gspca_dev->memory) {
1644                 PDEBUG(D_FRAM, "qbuf bad memory type");
1645                 ret = -EINVAL;
1646                 goto out;
1647         }
1648
1649         frame = &gspca_dev->frame[index];
1650         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1651                 PDEBUG(D_FRAM, "qbuf bad state");
1652                 ret = -EINVAL;
1653                 goto out;
1654         }
1655
1656         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1657
1658         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1659                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1660                 frame->v4l2_buf.length = v4l2_buf->length;
1661         }
1662
1663         /* put the buffer in the 'queued' queue */
1664         i = gspca_dev->fr_q;
1665         gspca_dev->fr_queue[i] = index;
1666         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1667         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1668                 gspca_dev->fr_q,
1669                 gspca_dev->fr_i,
1670                 gspca_dev->fr_o);
1671
1672         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1673         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1674         ret = 0;
1675 out:
1676         mutex_unlock(&gspca_dev->queue_lock);
1677         return ret;
1678 }
1679
1680 /*
1681  * allocate the resources for read()
1682  */
1683 static int read_alloc(struct gspca_dev *gspca_dev,
1684                         struct file *file)
1685 {
1686         struct v4l2_buffer v4l2_buf;
1687         int i, ret;
1688
1689         PDEBUG(D_STREAM, "read alloc");
1690         if (gspca_dev->nframes == 0) {
1691                 struct v4l2_requestbuffers rb;
1692
1693                 memset(&rb, 0, sizeof rb);
1694                 rb.count = gspca_dev->nbufread;
1695                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1696                 rb.memory = GSPCA_MEMORY_READ;
1697                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1698                 if (ret != 0) {
1699                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1700                         return ret;
1701                 }
1702                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1703                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1704                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1705                 for (i = 0; i < gspca_dev->nbufread; i++) {
1706                         v4l2_buf.index = i;
1707                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1708                         if (ret != 0) {
1709                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1710                                 return ret;
1711                         }
1712                 }
1713                 gspca_dev->memory = GSPCA_MEMORY_READ;
1714         }
1715
1716         /* start streaming */
1717         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1718         if (ret != 0)
1719                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1720         return ret;
1721 }
1722
1723 static unsigned int dev_poll(struct file *file, poll_table *wait)
1724 {
1725         struct gspca_dev *gspca_dev = file->private_data;
1726         int i, ret;
1727
1728         PDEBUG(D_FRAM, "poll");
1729
1730         poll_wait(file, &gspca_dev->wq, wait);
1731
1732         /* if reqbufs is not done, the user would use read() */
1733         if (gspca_dev->nframes == 0) {
1734                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1735                         return POLLERR;         /* not the 1st time */
1736                 ret = read_alloc(gspca_dev, file);
1737                 if (ret != 0)
1738                         return POLLERR;
1739         }
1740
1741         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1742                 return POLLERR;
1743
1744         /* check the next incoming buffer */
1745         i = gspca_dev->fr_o;
1746         i = gspca_dev->fr_queue[i];
1747         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1748                 ret = POLLIN | POLLRDNORM;      /* something to read */
1749         else
1750                 ret = 0;
1751         mutex_unlock(&gspca_dev->queue_lock);
1752         if (!gspca_dev->present)
1753                 return POLLHUP;
1754         return ret;
1755 }
1756
1757 static ssize_t dev_read(struct file *file, char __user *data,
1758                     size_t count, loff_t *ppos)
1759 {
1760         struct gspca_dev *gspca_dev = file->private_data;
1761         struct gspca_frame *frame;
1762         struct v4l2_buffer v4l2_buf;
1763         struct timeval timestamp;
1764         int n, ret, ret2;
1765
1766         PDEBUG(D_FRAM, "read (%zd)", count);
1767         if (!gspca_dev->present)
1768                 return -ENODEV;
1769         switch (gspca_dev->memory) {
1770         case GSPCA_MEMORY_NO:                   /* first time */
1771                 ret = read_alloc(gspca_dev, file);
1772                 if (ret != 0)
1773                         return ret;
1774                 break;
1775         case GSPCA_MEMORY_READ:
1776                 if (gspca_dev->capt_file == file)
1777                         break;
1778                 /* fall thru */
1779         default:
1780                 return -EINVAL;
1781         }
1782
1783         /* get a frame */
1784         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1785         timestamp.tv_sec--;
1786         n = 2;
1787         for (;;) {
1788                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1789                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1790                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1791                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1792                 if (ret != 0) {
1793                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1794                         return ret;
1795                 }
1796
1797                 /* if the process slept for more than 1 second,
1798                  * get a newer frame */
1799                 frame = &gspca_dev->frame[v4l2_buf.index];
1800                 if (--n < 0)
1801                         break;                  /* avoid infinite loop */
1802                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1803                         break;
1804                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1805                 if (ret != 0) {
1806                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1807                         return ret;
1808                 }
1809         }
1810
1811         /* copy the frame */
1812         if (count > frame->v4l2_buf.bytesused)
1813                 count = frame->v4l2_buf.bytesused;
1814         ret = copy_to_user(data, frame->data, count);
1815         if (ret != 0) {
1816                 PDEBUG(D_ERR|D_STREAM,
1817                         "read cp to user lack %d / %zd", ret, count);
1818                 ret = -EFAULT;
1819                 goto out;
1820         }
1821         ret = count;
1822 out:
1823         /* in each case, requeue the buffer */
1824         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1825         if (ret2 != 0)
1826                 return ret2;
1827         return ret;
1828 }
1829
1830 static struct v4l2_file_operations dev_fops = {
1831         .owner = THIS_MODULE,
1832         .open = dev_open,
1833         .release = dev_close,
1834         .read = dev_read,
1835         .mmap = dev_mmap,
1836         .unlocked_ioctl = video_ioctl2,
1837         .poll   = dev_poll,
1838 };
1839
1840 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1841         .vidioc_querycap        = vidioc_querycap,
1842         .vidioc_dqbuf           = vidioc_dqbuf,
1843         .vidioc_qbuf            = vidioc_qbuf,
1844         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1845         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1846         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1847         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1848         .vidioc_streamon        = vidioc_streamon,
1849         .vidioc_queryctrl       = vidioc_queryctrl,
1850         .vidioc_g_ctrl          = vidioc_g_ctrl,
1851         .vidioc_s_ctrl          = vidioc_s_ctrl,
1852         .vidioc_g_audio         = vidioc_g_audio,
1853         .vidioc_s_audio         = vidioc_s_audio,
1854         .vidioc_enumaudio       = vidioc_enumaudio,
1855         .vidioc_querymenu       = vidioc_querymenu,
1856         .vidioc_enum_input      = vidioc_enum_input,
1857         .vidioc_g_input         = vidioc_g_input,
1858         .vidioc_s_input         = vidioc_s_input,
1859         .vidioc_reqbufs         = vidioc_reqbufs,
1860         .vidioc_querybuf        = vidioc_querybuf,
1861         .vidioc_streamoff       = vidioc_streamoff,
1862         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1863         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1864         .vidioc_g_parm          = vidioc_g_parm,
1865         .vidioc_s_parm          = vidioc_s_parm,
1866         .vidioc_s_std           = vidioc_s_std,
1867 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1868         .vidiocgmbuf          = vidiocgmbuf,
1869 #endif
1870 };
1871
1872 static struct video_device gspca_template = {
1873         .name = "gspca main driver",
1874         .fops = &dev_fops,
1875         .ioctl_ops = &dev_ioctl_ops,
1876         .release = gspca_release,
1877         .minor = -1,
1878 };
1879
1880 /*
1881  * probe and create a new gspca device
1882  *
1883  * This function must be called by the sub-driver when it is
1884  * called for probing a new device.
1885  */
1886 int gspca_dev_probe(struct usb_interface *intf,
1887                 const struct usb_device_id *id,
1888                 const struct sd_desc *sd_desc,
1889                 int dev_size,
1890                 struct module *module)
1891 {
1892         struct usb_interface_descriptor *interface;
1893         struct gspca_dev *gspca_dev;
1894         struct usb_device *dev = interface_to_usbdev(intf);
1895         int ret;
1896
1897         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1898
1899         /* we don't handle multi-config cameras */
1900         if (dev->descriptor.bNumConfigurations != 1)
1901                 return -ENODEV;
1902         interface = &intf->cur_altsetting->desc;
1903         if (interface->bInterfaceNumber > 0)
1904                 return -ENODEV;
1905
1906         /* create the device */
1907         if (dev_size < sizeof *gspca_dev)
1908                 dev_size = sizeof *gspca_dev;
1909         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1910         if (!gspca_dev) {
1911                 err("couldn't kzalloc gspca struct");
1912                 return -ENOMEM;
1913         }
1914         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1915         if (!gspca_dev->usb_buf) {
1916                 err("out of memory");
1917                 ret = -ENOMEM;
1918                 goto out;
1919         }
1920         gspca_dev->dev = dev;
1921         gspca_dev->iface = interface->bInterfaceNumber;
1922         gspca_dev->nbalt = intf->num_altsetting;
1923         gspca_dev->sd_desc = sd_desc;
1924         gspca_dev->nbufread = 2;
1925         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1926
1927         /* configure the subdriver and initialize the USB device */
1928         ret = sd_desc->config(gspca_dev, id);
1929         if (ret < 0)
1930                 goto out;
1931         ret = sd_desc->init(gspca_dev);
1932         if (ret < 0)
1933                 goto out;
1934         ret = gspca_set_alt0(gspca_dev);
1935         if (ret < 0)
1936                 goto out;
1937         gspca_set_default_mode(gspca_dev);
1938
1939         mutex_init(&gspca_dev->usb_lock);
1940         mutex_init(&gspca_dev->read_lock);
1941         mutex_init(&gspca_dev->queue_lock);
1942         init_waitqueue_head(&gspca_dev->wq);
1943
1944         /* init video stuff */
1945         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1946         gspca_dev->vdev.parent = &dev->dev;
1947         gspca_dev->module = module;
1948         gspca_dev->present = 1;
1949         ret = video_register_device(&gspca_dev->vdev,
1950                                   VFL_TYPE_GRABBER,
1951                                   -1);
1952         if (ret < 0) {
1953                 err("video_register_device err %d", ret);
1954                 goto out;
1955         }
1956
1957         usb_set_intfdata(intf, gspca_dev);
1958         PDEBUG(D_PROBE, "probe ok");
1959         return 0;
1960 out:
1961         kfree(gspca_dev->usb_buf);
1962         kfree(gspca_dev);
1963         return ret;
1964 }
1965 EXPORT_SYMBOL(gspca_dev_probe);
1966
1967 /*
1968  * USB disconnection
1969  *
1970  * This function must be called by the sub-driver
1971  * when the device disconnects, after the specific resources are freed.
1972  */
1973 void gspca_disconnect(struct usb_interface *intf)
1974 {
1975         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1976
1977         mutex_lock(&gspca_dev->usb_lock);
1978         gspca_dev->present = 0;
1979
1980         if (gspca_dev->streaming) {
1981                 destroy_urbs(gspca_dev);
1982                 wake_up_interruptible(&gspca_dev->wq);
1983         }
1984
1985         /* the device is freed at exit of this function */
1986         gspca_dev->dev = NULL;
1987         mutex_unlock(&gspca_dev->usb_lock);
1988
1989         usb_set_intfdata(intf, NULL);
1990
1991         /* release the device */
1992         /* (this will call gspca_release() immediatly or on last close) */
1993         video_unregister_device(&gspca_dev->vdev);
1994
1995         PDEBUG(D_PROBE, "disconnect complete");
1996 }
1997 EXPORT_SYMBOL(gspca_disconnect);
1998
1999 #ifdef CONFIG_PM
2000 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2001 {
2002         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2003
2004         if (!gspca_dev->streaming)
2005                 return 0;
2006         gspca_dev->frozen = 1;          /* avoid urb error messages */
2007         if (gspca_dev->sd_desc->stopN)
2008                 gspca_dev->sd_desc->stopN(gspca_dev);
2009         destroy_urbs(gspca_dev);
2010         gspca_set_alt0(gspca_dev);
2011         if (gspca_dev->sd_desc->stop0)
2012                 gspca_dev->sd_desc->stop0(gspca_dev);
2013         return 0;
2014 }
2015 EXPORT_SYMBOL(gspca_suspend);
2016
2017 int gspca_resume(struct usb_interface *intf)
2018 {
2019         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2020
2021         gspca_dev->frozen = 0;
2022         gspca_dev->sd_desc->init(gspca_dev);
2023         if (gspca_dev->streaming)
2024                 return gspca_init_transfer(gspca_dev);
2025         return 0;
2026 }
2027 EXPORT_SYMBOL(gspca_resume);
2028 #endif
2029 /* -- cam driver utility functions -- */
2030
2031 /* auto gain and exposure algorithm based on the knee algorithm described here:
2032    http://ytse.tricolour.net/docs/LowLightOptimization.html
2033
2034    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2035    where changed. */
2036 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2037         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2038 {
2039         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2040         const struct ctrl *gain_ctrl = NULL;
2041         const struct ctrl *exposure_ctrl = NULL;
2042         const struct ctrl *autogain_ctrl = NULL;
2043         int retval = 0;
2044
2045         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2046                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2047                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2048                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2049                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2050                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2051                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2052         }
2053         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2054                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2055                         "on cam without (auto)gain/exposure");
2056                 return 0;
2057         }
2058
2059         if (gain_ctrl->get(gspca_dev, &gain) ||
2060                         exposure_ctrl->get(gspca_dev, &exposure) ||
2061                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2062                 return 0;
2063
2064         orig_gain = gain;
2065         orig_exposure = exposure;
2066
2067         /* If we are of a multiple of deadzone, do multiple steps to reach the
2068            desired lumination fast (with the risc of a slight overshoot) */
2069         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2070
2071         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2072                 avg_lum, desired_avg_lum, steps);
2073
2074         for (i = 0; i < steps; i++) {
2075                 if (avg_lum > desired_avg_lum) {
2076                         if (gain > gain_knee)
2077                                 gain--;
2078                         else if (exposure > exposure_knee)
2079                                 exposure--;
2080                         else if (gain > gain_ctrl->qctrl.default_value)
2081                                 gain--;
2082                         else if (exposure > exposure_ctrl->qctrl.minimum)
2083                                 exposure--;
2084                         else if (gain > gain_ctrl->qctrl.minimum)
2085                                 gain--;
2086                         else
2087                                 break;
2088                 } else {
2089                         if (gain < gain_ctrl->qctrl.default_value)
2090                                 gain++;
2091                         else if (exposure < exposure_knee)
2092                                 exposure++;
2093                         else if (gain < gain_knee)
2094                                 gain++;
2095                         else if (exposure < exposure_ctrl->qctrl.maximum)
2096                                 exposure++;
2097                         else if (gain < gain_ctrl->qctrl.maximum)
2098                                 gain++;
2099                         else
2100                                 break;
2101                 }
2102         }
2103
2104         if (gain != orig_gain) {
2105                 gain_ctrl->set(gspca_dev, gain);
2106                 retval = 1;
2107         }
2108         if (exposure != orig_exposure) {
2109                 exposure_ctrl->set(gspca_dev, exposure);
2110                 retval = 1;
2111         }
2112
2113         return retval;
2114 }
2115 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2116
2117 /* -- module insert / remove -- */
2118 static int __init gspca_init(void)
2119 {
2120         info("main v%d.%d.%d registered",
2121                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2122                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2123                 DRIVER_VERSION_NUMBER & 0xff);
2124         return 0;
2125 }
2126 static void __exit gspca_exit(void)
2127 {
2128         info("main deregistered");
2129 }
2130
2131 module_init(gspca_init);
2132 module_exit(gspca_exit);
2133
2134 #ifdef GSPCA_DEBUG
2135 module_param_named(debug, gspca_debug, int, 0644);
2136 MODULE_PARM_DESC(debug,
2137                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2138                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2139                 " 0x0100: v4l2");
2140 #endif