drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2009 Jean-Francois Moine (http://moinejf.free.fr)
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/jiffies.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #ifdef CONFIG_INPUT
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 9, 0)
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #ifdef CONFIG_INPUT
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         PDEBUG(D_ERR, "Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         PDEBUG(D_ERR, "Input device registration failed "
 181                                 "with error %i", err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = ep->wMaxPacketSize;
 203         interval = ep->bInterval;
 204         PDEBUG(D_PROBE, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, ep->wMaxPacketSize,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         gspca_dev->int_urb = urb;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PDEBUG(D_ERR, "submit URB failed with error %i", ret);
 230                 goto error_submit;
 231         }
 232         return ret;
 233
 234 error_submit:
 235         usb_free_coherent(dev,
 236                           urb->transfer_buffer_length,
 237                           urb->transfer_buffer,
 238                           urb->transfer_dma);
 239 error_buffer:
 240         usb_free_urb(urb);
 241 error:
 242         return ret;
 243 }
 244
 245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 246 {
 247         struct usb_interface *intf;
 248         struct usb_host_interface *intf_desc;
 249         struct usb_endpoint_descriptor *ep;
 250         int i;
 251
 252         if (gspca_dev->sd_desc->int_pkt_scan)  {
 253                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 254                 intf_desc = intf->cur_altsetting;
 255                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 256                         ep = &intf_desc->endpoint[i].desc;
 257                         if (usb_endpoint_dir_in(ep) &&
 258                             usb_endpoint_xfer_int(ep)) {
 259
 260                                 alloc_and_submit_int_urb(gspca_dev, ep);
 261                                 break;
 262                         }
 263                 }
 264         }
 265 }
 266
 267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 268 {
 269         struct urb *urb;
 270
 271         urb = gspca_dev->int_urb;
 272         if (urb) {
 273                 gspca_dev->int_urb = NULL;
 274                 usb_kill_urb(urb);
 275                 usb_free_coherent(gspca_dev->dev,
 276                                   urb->transfer_buffer_length,
 277                                   urb->transfer_buffer,
 278                                   urb->transfer_dma);
 279                 usb_free_urb(urb);
 280         }
 281 }
 282 #else
 283 #define gspca_input_connect(gspca_dev)          0
 284 #define gspca_input_create_urb(gspca_dev)
 285 #define gspca_input_destroy_urb(gspca_dev)
 286 #endif
 287
 288 /* get the current input frame buffer */
 289 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 290 {
 291         struct gspca_frame *frame;
 292
 293         frame = gspca_dev->cur_frame;
 294         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 295                                 != V4L2_BUF_FLAG_QUEUED)
 296                 return NULL;
 297         return frame;
 298 }
 299 EXPORT_SYMBOL(gspca_get_i_frame);
 300
 301 /*
 302  * fill a video frame from an URB and resubmit
 303  */
 304 static void fill_frame(struct gspca_dev *gspca_dev,
 305                         struct urb *urb)
 306 {
 307         u8 *data;               /* address of data in the iso message */
 308         int i, len, st;
 309         cam_pkt_op pkt_scan;
 310
 311         if (urb->status != 0) {
 312                 if (urb->status == -ESHUTDOWN)
 313                         return;         /* disconnection */
 314 #ifdef CONFIG_PM
 315                 if (gspca_dev->frozen)
 316                         return;
 317 #endif
 318                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 319                 urb->status = 0;
 320                 goto resubmit;
 321         }
 322         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 323         for (i = 0; i < urb->number_of_packets; i++) {
 324
 325                 /* check the packet status and length */
 326                 len = urb->iso_frame_desc[i].actual_length;
 327                 if (len == 0) {
 328                         if (gspca_dev->empty_packet == 0)
 329                                 gspca_dev->empty_packet = 1;
 330                         continue;
 331                 }
 332                 st = urb->iso_frame_desc[i].status;
 333                 if (st) {
 334                         PDEBUG(D_ERR,
 335                                 "ISOC data error: [%d] len=%d, status=%d",
 336                                 i, len, st);
 337                         gspca_dev->last_packet_type = DISCARD_PACKET;
 338                         continue;
 339                 }
 340
 341                 /* let the packet be analyzed by the subdriver */
 342                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 343                         i, urb->iso_frame_desc[i].offset, len);
 344                 data = (u8 *) urb->transfer_buffer
 345                                         + urb->iso_frame_desc[i].offset;
 346                 pkt_scan(gspca_dev, data, len);
 347         }
 348
 349 resubmit:
 350         /* resubmit the URB */
 351         st = usb_submit_urb(urb, GFP_ATOMIC);
 352         if (st < 0)
 353                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 354 }
 355
 356 /*
 357  * ISOC message interrupt from the USB device
 358  *
 359  * Analyse each packet and call the subdriver for copy to the frame buffer.
 360  */
 361 static void isoc_irq(struct urb *urb)
 362 {
 363         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 364
 365         PDEBUG(D_PACK, "isoc irq");
 366         if (!gspca_dev->streaming)
 367                 return;
 368         fill_frame(gspca_dev, urb);
 369 }
 370
 371 /*
 372  * bulk message interrupt from the USB device
 373  */
 374 static void bulk_irq(struct urb *urb)
 375 {
 376         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 377         int st;
 378
 379         PDEBUG(D_PACK, "bulk irq");
 380         if (!gspca_dev->streaming)
 381                 return;
 382         switch (urb->status) {
 383         case 0:
 384                 break;
 385         case -ESHUTDOWN:
 386                 return;         /* disconnection */
 387         default:
 388 #ifdef CONFIG_PM
 389                 if (gspca_dev->frozen)
 390                         return;
 391 #endif
 392                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 393                 urb->status = 0;
 394                 goto resubmit;
 395         }
 396
 397         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 398         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 399                                 urb->transfer_buffer,
 400                                 urb->actual_length);
 401
 402 resubmit:
 403         /* resubmit the URB */
 404         if (gspca_dev->cam.bulk_nurbs != 0) {
 405                 st = usb_submit_urb(urb, GFP_ATOMIC);
 406                 if (st < 0)
 407                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 408         }
 409 }
 410
 411 /*
 412  * add data to the current frame
 413  *
 414  * This function is called by the subdrivers at interrupt level.
 415  *
 416  * To build a frame, these ones must add
 417  *      - one FIRST_PACKET
 418  *      - 0 or many INTER_PACKETs
 419  *      - one LAST_PACKET
 420  * DISCARD_PACKET invalidates the whole frame.
 421  * On LAST_PACKET, a new frame is returned.
 422  */
 423 void gspca_frame_add(struct gspca_dev *gspca_dev,
 424                         enum gspca_packet_type packet_type,
 425                         const u8 *data,
 426                         int len)
 427 {
 428         struct gspca_frame *frame;
 429         int i, j;
 430
 431         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 432
 433         /* check the availability of the frame buffer */
 434         frame = gspca_dev->cur_frame;
 435         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 436                                         != V4L2_BUF_FLAG_QUEUED) {
 437                 gspca_dev->last_packet_type = DISCARD_PACKET;
 438                 return;
 439         }
 440
 441         /* when start of a new frame, if the current frame buffer
 442          * is not queued, discard the whole frame */
 443         if (packet_type == FIRST_PACKET) {
 444                 frame->data_end = frame->data;
 445                 jiffies_to_timeval(get_jiffies_64(),
 446                                    &frame->v4l2_buf.timestamp);
 447                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 448         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 449                 if (packet_type == LAST_PACKET)
 450                         gspca_dev->last_packet_type = packet_type;
 451                 return;
 452         }
 453
 454         /* append the packet to the frame buffer */
 455         if (len > 0) {
 456                 if (frame->data_end - frame->data + len
 457                                                  > frame->v4l2_buf.length) {
 458                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 459                                 frame->data_end - frame->data + len,
 460                                 frame->v4l2_buf.length);
 461                         packet_type = DISCARD_PACKET;
 462                 } else {
 463                         memcpy(frame->data_end, data, len);
 464                         frame->data_end += len;
 465                 }
 466         }
 467         gspca_dev->last_packet_type = packet_type;
 468
 469         /* if last packet, wake up the application and advance in the queue */
 470         if (packet_type == LAST_PACKET) {
 471                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 472                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 473                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 474                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 475                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 476                 gspca_dev->fr_i = i;
 477                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 478                         frame->v4l2_buf.bytesused,
 479                         gspca_dev->fr_q,
 480                         i,
 481                         gspca_dev->fr_o);
 482                 j = gspca_dev->fr_queue[i];
 483                 gspca_dev->cur_frame = &gspca_dev->frame[j];
 484         }
 485 }
 486 EXPORT_SYMBOL(gspca_frame_add);
 487
 488 static int gspca_is_compressed(__u32 format)
 489 {
 490         switch (format) {
 491         case V4L2_PIX_FMT_MJPEG:
 492         case V4L2_PIX_FMT_JPEG:
 493         case V4L2_PIX_FMT_SPCA561:
 494         case V4L2_PIX_FMT_PAC207:
 495         case V4L2_PIX_FMT_MR97310A:
 496                 return 1;
 497         }
 498         return 0;
 499 }
 500
 501 static void *rvmalloc(long size)
 502 {
 503         void *mem;
 504         unsigned long adr;
 505
 506         mem = vmalloc_32(size);
 507         if (mem != NULL) {
 508                 adr = (unsigned long) mem;
 509                 while (size > 0) {
 510                         SetPageReserved(vmalloc_to_page((void *) adr));
 511                         adr += PAGE_SIZE;
 512                         size -= PAGE_SIZE;
 513                 }
 514         }
 515         return mem;
 516 }
 517
 518 static void rvfree(void *mem, long size)
 519 {
 520         unsigned long adr;
 521
 522         adr = (unsigned long) mem;
 523         while (size > 0) {
 524                 ClearPageReserved(vmalloc_to_page((void *) adr));
 525                 adr += PAGE_SIZE;
 526                 size -= PAGE_SIZE;
 527         }
 528         vfree(mem);
 529 }
 530
 531 static int frame_alloc(struct gspca_dev *gspca_dev,
 532                         unsigned int count)
 533 {
 534         struct gspca_frame *frame;
 535         unsigned int frsz;
 536         int i;
 537
 538         i = gspca_dev->curr_mode;
 539         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 540         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 541         frsz = PAGE_ALIGN(frsz);
 542         gspca_dev->frsz = frsz;
 543         if (count > GSPCA_MAX_FRAMES)
 544                 count = GSPCA_MAX_FRAMES;
 545         gspca_dev->frbuf = rvmalloc(frsz * count);
 546         if (!gspca_dev->frbuf) {
 547                 err("frame alloc failed");
 548                 return -ENOMEM;
 549         }
 550         gspca_dev->nframes = count;
 551         for (i = 0; i < count; i++) {
 552                 frame = &gspca_dev->frame[i];
 553                 frame->v4l2_buf.index = i;
 554                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 555                 frame->v4l2_buf.flags = 0;
 556                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 557                 frame->v4l2_buf.length = frsz;
 558                 frame->v4l2_buf.memory = gspca_dev->memory;
 559                 frame->v4l2_buf.sequence = 0;
 560                 frame->data = frame->data_end =
 561                                         gspca_dev->frbuf + i * frsz;
 562                 frame->v4l2_buf.m.offset = i * frsz;
 563         }
 564         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 565         gspca_dev->cur_frame = &gspca_dev->frame[0];
 566         gspca_dev->last_packet_type = DISCARD_PACKET;
 567         gspca_dev->sequence = 0;
 568         return 0;
 569 }
 570
 571 static void frame_free(struct gspca_dev *gspca_dev)
 572 {
 573         int i;
 574
 575         PDEBUG(D_STREAM, "frame free");
 576         if (gspca_dev->frbuf != NULL) {
 577                 rvfree(gspca_dev->frbuf,
 578                         gspca_dev->nframes * gspca_dev->frsz);
 579                 gspca_dev->frbuf = NULL;
 580                 for (i = 0; i < gspca_dev->nframes; i++)
 581                         gspca_dev->frame[i].data = NULL;
 582         }
 583         gspca_dev->nframes = 0;
 584 }
 585
 586 static void destroy_urbs(struct gspca_dev *gspca_dev)
 587 {
 588         struct urb *urb;
 589         unsigned int i;
 590
 591         PDEBUG(D_STREAM, "kill transfer");
 592         for (i = 0; i < MAX_NURBS; i++) {
 593                 urb = gspca_dev->urb[i];
 594                 if (urb == NULL)
 595                         break;
 596
 597                 gspca_dev->urb[i] = NULL;
 598                 usb_kill_urb(urb);
 599                 if (urb->transfer_buffer != NULL)
 600                         usb_free_coherent(gspca_dev->dev,
 601                                           urb->transfer_buffer_length,
 602                                           urb->transfer_buffer,
 603                                           urb->transfer_dma);
 604                 usb_free_urb(urb);
 605         }
 606 }
 607
 608 /*
 609  * look for an input transfer endpoint in an alternate setting
 610  */
 611 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 612                                           int xfer)
 613 {
 614         struct usb_host_endpoint *ep;
 615         int i, attr;
 616
 617         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 618                 ep = &alt->endpoint[i];
 619                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 620                 if (attr == xfer
 621                     && ep->desc.wMaxPacketSize != 0)
 622                         return ep;
 623         }
 624         return NULL;
 625 }
 626
 627 /*
 628  * look for an input (isoc or bulk) endpoint
 629  *
 630  * The endpoint is defined by the subdriver.
 631  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 632  * This routine may be called many times when the bandwidth is too small
 633  * (the bandwidth is checked on urb submit).
 634  */
 635 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 636 {
 637         struct usb_interface *intf;
 638         struct usb_host_endpoint *ep;
 639         int xfer, i, ret;
 640
 641         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 642         ep = NULL;
 643         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 644                                    : USB_ENDPOINT_XFER_ISOC;
 645         i = gspca_dev->alt;                     /* previous alt setting */
 646         if (gspca_dev->cam.reverse_alts) {
 647                 while (++i < gspca_dev->nbalt) {
 648                         ep = alt_xfer(&intf->altsetting[i], xfer);
 649                         if (ep)
 650                                 break;
 651                 }
 652         } else {
 653                 while (--i >= 0) {
 654                         ep = alt_xfer(&intf->altsetting[i], xfer);
 655                         if (ep)
 656                                 break;
 657                 }
 658         }
 659         if (ep == NULL) {
 660                 err("no transfer endpoint found");
 661                 return NULL;
 662         }
 663         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 664                         i, ep->desc.bEndpointAddress);
 665         gspca_dev->alt = i;             /* memorize the current alt setting */
 666         if (gspca_dev->nbalt > 1) {
 667                 gspca_input_destroy_urb(gspca_dev);
 668                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 669                 if (ret < 0) {
 670                         err("set alt %d err %d", i, ret);
 671                         ep = NULL;
 672                 }
 673                 gspca_input_create_urb(gspca_dev);
 674         }
 675         return ep;
 676 }
 677
 678 /*
 679  * create the URBs for image transfer
 680  */
 681 static int create_urbs(struct gspca_dev *gspca_dev,
 682                         struct usb_host_endpoint *ep)
 683 {
 684         struct urb *urb;
 685         int n, nurbs, i, psize, npkt, bsize;
 686
 687         /* calculate the packet size and the number of packets */
 688         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 689
 690         if (!gspca_dev->cam.bulk) {             /* isoc */
 691
 692                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 693                 if (gspca_dev->pkt_size == 0)
 694                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 695                 else
 696                         psize = gspca_dev->pkt_size;
 697                 npkt = gspca_dev->cam.npkt;
 698                 if (npkt == 0)
 699                         npkt = 32;              /* default value */
 700                 bsize = psize * npkt;
 701                 PDEBUG(D_STREAM,
 702                         "isoc %d pkts size %d = bsize:%d",
 703                         npkt, psize, bsize);
 704                 nurbs = DEF_NURBS;
 705         } else {                                /* bulk */
 706                 npkt = 0;
 707                 bsize = gspca_dev->cam.bulk_size;
 708                 if (bsize == 0)
 709                         bsize = psize;
 710                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 711                 if (gspca_dev->cam.bulk_nurbs != 0)
 712                         nurbs = gspca_dev->cam.bulk_nurbs;
 713                 else
 714                         nurbs = 1;
 715         }
 716
 717         for (n = 0; n < nurbs; n++) {
 718                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 719                 if (!urb) {
 720                         err("usb_alloc_urb failed");
 721                         return -ENOMEM;
 722                 }
 723                 gspca_dev->urb[n] = urb;
 724                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 725                                                 bsize,
 726                                                 GFP_KERNEL,
 727                                                 &urb->transfer_dma);
 728
 729                 if (urb->transfer_buffer == NULL) {
 730                         err("usb_alloc_coherent failed");
 731                         return -ENOMEM;
 732                 }
 733                 urb->dev = gspca_dev->dev;
 734                 urb->context = gspca_dev;
 735                 urb->transfer_buffer_length = bsize;
 736                 if (npkt != 0) {                /* ISOC */
 737                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 738                                                     ep->desc.bEndpointAddress);
 739                         urb->transfer_flags = URB_ISO_ASAP
 740                                         | URB_NO_TRANSFER_DMA_MAP;
 741                         urb->interval = ep->desc.bInterval;
 742                         urb->complete = isoc_irq;
 743                         urb->number_of_packets = npkt;
 744                         for (i = 0; i < npkt; i++) {
 745                                 urb->iso_frame_desc[i].length = psize;
 746                                 urb->iso_frame_desc[i].offset = psize * i;
 747                         }
 748                 } else {                /* bulk */
 749                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 750                                                 ep->desc.bEndpointAddress),
 751                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 752                         urb->complete = bulk_irq;
 753                 }
 754         }
 755         return 0;
 756 }
 757
 758 /*
 759  * start the USB transfer
 760  */
 761 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 762 {
 763         struct usb_host_endpoint *ep;
 764         struct urb *urb;
 765         int n, ret;
 766
 767         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 768                 return -ERESTARTSYS;
 769
 770         if (!gspca_dev->present) {
 771                 ret = -ENODEV;
 772                 goto out;
 773         }
 774
 775         gspca_dev->usb_err = 0;
 776
 777         /* set the higher alternate setting and
 778          * loop until urb submit succeeds */
 779         if (gspca_dev->cam.reverse_alts)
 780                 gspca_dev->alt = 0;
 781         else
 782                 gspca_dev->alt = gspca_dev->nbalt;
 783
 784         if (gspca_dev->sd_desc->isoc_init) {
 785                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 786                 if (ret < 0)
 787                         goto out;
 788         }
 789         ep = get_ep(gspca_dev);
 790         if (ep == NULL) {
 791                 ret = -EIO;
 792                 goto out;
 793         }
 794         for (;;) {
 795                 if (!gspca_dev->cam.no_urb_create) {
 796                         PDEBUG(D_STREAM, "init transfer alt %d",
 797                                 gspca_dev->alt);
 798                         ret = create_urbs(gspca_dev, ep);
 799                         if (ret < 0) {
 800                                 destroy_urbs(gspca_dev);
 801                                 goto out;
 802                         }
 803                 }
 804
 805                 /* clear the bulk endpoint */
 806                 if (gspca_dev->cam.bulk)
 807                         usb_clear_halt(gspca_dev->dev,
 808                                         gspca_dev->urb[0]->pipe);
 809
 810                 /* start the cam */
 811                 ret = gspca_dev->sd_desc->start(gspca_dev);
 812                 if (ret < 0) {
 813                         destroy_urbs(gspca_dev);
 814                         goto out;
 815                 }
 816                 gspca_dev->streaming = 1;
 817
 818                 /* some bulk transfers are started by the subdriver */
 819                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 820                         break;
 821
 822                 /* submit the URBs */
 823                 for (n = 0; n < MAX_NURBS; n++) {
 824                         urb = gspca_dev->urb[n];
 825                         if (urb == NULL)
 826                                 break;
 827                         ret = usb_submit_urb(urb, GFP_KERNEL);
 828                         if (ret < 0)
 829                                 break;
 830                 }
 831                 if (ret >= 0)
 832                         break;
 833                 gspca_dev->streaming = 0;
 834                 destroy_urbs(gspca_dev);
 835                 if (ret != -ENOSPC) {
 836                         PDEBUG(D_ERR|D_STREAM,
 837                                 "usb_submit_urb alt %d err %d",
 838                                 gspca_dev->alt, ret);
 839                         goto out;
 840                 }
 841
 842                 /* the bandwidth is not wide enough
 843                  * negociate or try a lower alternate setting */
 844                 PDEBUG(D_ERR|D_STREAM,
 845                         "bandwidth not wide enough - trying again");
 846                 msleep(20);     /* wait for kill complete */
 847                 if (gspca_dev->sd_desc->isoc_nego) {
 848                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 849                         if (ret < 0)
 850                                 goto out;
 851                 } else {
 852                         ep = get_ep(gspca_dev);
 853                         if (ep == NULL) {
 854                                 ret = -EIO;
 855                                 goto out;
 856                         }
 857                 }
 858         }
 859 out:
 860         mutex_unlock(&gspca_dev->usb_lock);
 861         return ret;
 862 }
 863
 864 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 865 {
 866         int ret;
 867
 868         if (gspca_dev->alt == 0)
 869                 return 0;
 870         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 871         if (ret < 0)
 872                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 873         return ret;
 874 }
 875
 876 /* Note: both the queue and the usb locks should be held when calling this */
 877 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 878 {
 879         gspca_dev->streaming = 0;
 880         if (gspca_dev->present) {
 881                 if (gspca_dev->sd_desc->stopN)
 882                         gspca_dev->sd_desc->stopN(gspca_dev);
 883                 destroy_urbs(gspca_dev);
 884                 gspca_input_destroy_urb(gspca_dev);
 885                 gspca_set_alt0(gspca_dev);
 886                 gspca_input_create_urb(gspca_dev);
 887         }
 888
 889         /* always call stop0 to free the subdriver's resources */
 890         if (gspca_dev->sd_desc->stop0)
 891                 gspca_dev->sd_desc->stop0(gspca_dev);
 892         PDEBUG(D_STREAM, "stream off OK");
 893 }
 894
 895 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 896 {
 897         int i;
 898
 899         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 900         gspca_dev->curr_mode = i;
 901         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 902         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 903         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 904 }
 905
 906 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 907                         int width, int height)
 908 {
 909         int i;
 910
 911         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 912                 if (width >= gspca_dev->cam.cam_mode[i].width
 913                     && height >= gspca_dev->cam.cam_mode[i].height)
 914                         break;
 915         }
 916         return i;
 917 }
 918
 919 /*
 920  * search a mode with the right pixel format
 921  */
 922 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 923                         int mode,
 924                         int pixfmt)
 925 {
 926         int modeU, modeD;
 927
 928         modeU = modeD = mode;
 929         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 930                 if (--modeD >= 0) {
 931                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 932                                                                 == pixfmt)
 933                                 return modeD;
 934                 }
 935                 if (++modeU < gspca_dev->cam.nmodes) {
 936                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 937                                                                 == pixfmt)
 938                                 return modeU;
 939                 }
 940         }
 941         return -EINVAL;
 942 }
 943
 944 #ifdef CONFIG_VIDEO_ADV_DEBUG
 945 static int vidioc_g_register(struct file *file, void *priv,
 946                         struct v4l2_dbg_register *reg)
 947 {
 948         int ret;
 949         struct gspca_dev *gspca_dev = priv;
 950
 951         if (!gspca_dev->sd_desc->get_chip_ident)
 952                 return -EINVAL;
 953
 954         if (!gspca_dev->sd_desc->get_register)
 955                 return -EINVAL;
 956
 957         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 958                 return -ERESTARTSYS;
 959         gspca_dev->usb_err = 0;
 960         if (gspca_dev->present)
 961                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 962         else
 963                 ret = -ENODEV;
 964         mutex_unlock(&gspca_dev->usb_lock);
 965
 966         return ret;
 967 }
 968
 969 static int vidioc_s_register(struct file *file, void *priv,
 970                         struct v4l2_dbg_register *reg)
 971 {
 972         int ret;
 973         struct gspca_dev *gspca_dev = priv;
 974
 975         if (!gspca_dev->sd_desc->get_chip_ident)
 976                 return -EINVAL;
 977
 978         if (!gspca_dev->sd_desc->set_register)
 979                 return -EINVAL;
 980
 981         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 982                 return -ERESTARTSYS;
 983         gspca_dev->usb_err = 0;
 984         if (gspca_dev->present)
 985                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 986         else
 987                 ret = -ENODEV;
 988         mutex_unlock(&gspca_dev->usb_lock);
 989
 990         return ret;
 991 }
 992 #endif
 993
 994 static int vidioc_g_chip_ident(struct file *file, void *priv,
 995                         struct v4l2_dbg_chip_ident *chip)
 996 {
 997         int ret;
 998         struct gspca_dev *gspca_dev = priv;
 999
1000         if (!gspca_dev->sd_desc->get_chip_ident)
1001                 return -EINVAL;
1002
1003         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1004                 return -ERESTARTSYS;
1005         gspca_dev->usb_err = 0;
1006         if (gspca_dev->present)
1007                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1008         else
1009                 ret = -ENODEV;
1010         mutex_unlock(&gspca_dev->usb_lock);
1011
1012         return ret;
1013 }
1014
1015 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1016                                 struct v4l2_fmtdesc *fmtdesc)
1017 {
1018         struct gspca_dev *gspca_dev = priv;
1019         int i, j, index;
1020         __u32 fmt_tb[8];
1021
1022         /* give an index to each format */
1023         index = 0;
1024         j = 0;
1025         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1026                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1027                 j = 0;
1028                 for (;;) {
1029                         if (fmt_tb[j] == fmt_tb[index])
1030                                 break;
1031                         j++;
1032                 }
1033                 if (j == index) {
1034                         if (fmtdesc->index == index)
1035                                 break;          /* new format */
1036                         index++;
1037                         if (index >= ARRAY_SIZE(fmt_tb))
1038                                 return -EINVAL;
1039                 }
1040         }
1041         if (i < 0)
1042                 return -EINVAL;         /* no more format */
1043
1044         fmtdesc->pixelformat = fmt_tb[index];
1045         if (gspca_is_compressed(fmt_tb[index]))
1046                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1047         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1048         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1049         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1050         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1051         fmtdesc->description[4] = '\0';
1052         return 0;
1053 }
1054
1055 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1056                             struct v4l2_format *fmt)
1057 {
1058         struct gspca_dev *gspca_dev = priv;
1059         int mode;
1060
1061         mode = gspca_dev->curr_mode;
1062         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1063                 sizeof fmt->fmt.pix);
1064         return 0;
1065 }
1066
1067 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1068                         struct v4l2_format *fmt)
1069 {
1070         int w, h, mode, mode2;
1071
1072         w = fmt->fmt.pix.width;
1073         h = fmt->fmt.pix.height;
1074
1075 #ifdef GSPCA_DEBUG
1076         if (gspca_debug & D_CONF)
1077                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1078 #endif
1079         /* search the closest mode for width and height */
1080         mode = wxh_to_mode(gspca_dev, w, h);
1081
1082         /* OK if right palette */
1083         if (gspca_dev->cam.cam_mode[mode].pixelformat
1084                                                 != fmt->fmt.pix.pixelformat) {
1085
1086                 /* else, search the closest mode with the same pixel format */
1087                 mode2 = gspca_get_mode(gspca_dev, mode,
1088                                         fmt->fmt.pix.pixelformat);
1089                 if (mode2 >= 0)
1090                         mode = mode2;
1091 /*              else
1092                         ;                * no chance, return this mode */
1093         }
1094         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1095                 sizeof fmt->fmt.pix);
1096         return mode;                    /* used when s_fmt */
1097 }
1098
1099 static int vidioc_try_fmt_vid_cap(struct file *file,
1100                               void *priv,
1101                               struct v4l2_format *fmt)
1102 {
1103         struct gspca_dev *gspca_dev = priv;
1104         int ret;
1105
1106         ret = try_fmt_vid_cap(gspca_dev, fmt);
1107         if (ret < 0)
1108                 return ret;
1109         return 0;
1110 }
1111
1112 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1113                             struct v4l2_format *fmt)
1114 {
1115         struct gspca_dev *gspca_dev = priv;
1116         int ret;
1117
1118         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1119                 return -ERESTARTSYS;
1120
1121         ret = try_fmt_vid_cap(gspca_dev, fmt);
1122         if (ret < 0)
1123                 goto out;
1124
1125         if (gspca_dev->nframes != 0
1126             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1127                 ret = -EINVAL;
1128                 goto out;
1129         }
1130
1131         if (ret == gspca_dev->curr_mode) {
1132                 ret = 0;
1133                 goto out;                       /* same mode */
1134         }
1135
1136         if (gspca_dev->streaming) {
1137                 ret = -EBUSY;
1138                 goto out;
1139         }
1140         gspca_dev->width = fmt->fmt.pix.width;
1141         gspca_dev->height = fmt->fmt.pix.height;
1142         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1143         gspca_dev->curr_mode = ret;
1144
1145         ret = 0;
1146 out:
1147         mutex_unlock(&gspca_dev->queue_lock);
1148         return ret;
1149 }
1150
1151 static int vidioc_enum_framesizes(struct file *file, void *priv,
1152                                   struct v4l2_frmsizeenum *fsize)
1153 {
1154         struct gspca_dev *gspca_dev = priv;
1155         int i;
1156         __u32 index = 0;
1157
1158         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1159                 if (fsize->pixel_format !=
1160                                 gspca_dev->cam.cam_mode[i].pixelformat)
1161                         continue;
1162
1163                 if (fsize->index == index) {
1164                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1165                         fsize->discrete.width =
1166                                 gspca_dev->cam.cam_mode[i].width;
1167                         fsize->discrete.height =
1168                                 gspca_dev->cam.cam_mode[i].height;
1169                         return 0;
1170                 }
1171                 index++;
1172         }
1173
1174         return -EINVAL;
1175 }
1176
1177 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1178                                       struct v4l2_frmivalenum *fival)
1179 {
1180         struct gspca_dev *gspca_dev = priv;
1181         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1182         __u32 i;
1183
1184         if (gspca_dev->cam.mode_framerates == NULL ||
1185                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1186                 return -EINVAL;
1187
1188         if (fival->pixel_format !=
1189                         gspca_dev->cam.cam_mode[mode].pixelformat)
1190                 return -EINVAL;
1191
1192         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1193                 if (fival->index == i) {
1194                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1195                         fival->discrete.numerator = 1;
1196                         fival->discrete.denominator =
1197                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1198                         return 0;
1199                 }
1200         }
1201
1202         return -EINVAL;
1203 }
1204
1205 static void gspca_release(struct video_device *vfd)
1206 {
1207         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1208
1209         PDEBUG(D_PROBE, "%s released",
1210                 video_device_node_name(&gspca_dev->vdev));
1211
1212         kfree(gspca_dev->usb_buf);
1213         kfree(gspca_dev);
1214 }
1215
1216 static int dev_open(struct file *file)
1217 {
1218         struct gspca_dev *gspca_dev;
1219         int ret;
1220
1221         PDEBUG(D_STREAM, "[%s] open", current->comm);
1222         gspca_dev = (struct gspca_dev *) video_devdata(file);
1223         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1224                 return -ERESTARTSYS;
1225         if (!gspca_dev->present) {
1226                 ret = -ENODEV;
1227                 goto out;
1228         }
1229
1230         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1231                 ret = -EBUSY;
1232                 goto out;
1233         }
1234
1235         /* protect the subdriver against rmmod */
1236         if (!try_module_get(gspca_dev->module)) {
1237                 ret = -ENODEV;
1238                 goto out;
1239         }
1240
1241         gspca_dev->users++;
1242
1243         file->private_data = gspca_dev;
1244 #ifdef GSPCA_DEBUG
1245         /* activate the v4l2 debug */
1246         if (gspca_debug & D_V4L2)
1247                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1248                                         | V4L2_DEBUG_IOCTL_ARG;
1249         else
1250                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1251                                         | V4L2_DEBUG_IOCTL_ARG);
1252 #endif
1253         ret = 0;
1254 out:
1255         mutex_unlock(&gspca_dev->queue_lock);
1256         if (ret != 0)
1257                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1258         else
1259                 PDEBUG(D_STREAM, "open done");
1260         return ret;
1261 }
1262
1263 static int dev_close(struct file *file)
1264 {
1265         struct gspca_dev *gspca_dev = file->private_data;
1266
1267         PDEBUG(D_STREAM, "[%s] close", current->comm);
1268         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1269                 return -ERESTARTSYS;
1270         gspca_dev->users--;
1271
1272         /* if the file did the capture, free the streaming resources */
1273         if (gspca_dev->capt_file == file) {
1274                 if (gspca_dev->streaming) {
1275                         mutex_lock(&gspca_dev->usb_lock);
1276                         gspca_dev->usb_err = 0;
1277                         gspca_stream_off(gspca_dev);
1278                         mutex_unlock(&gspca_dev->usb_lock);
1279                 }
1280                 frame_free(gspca_dev);
1281                 gspca_dev->capt_file = NULL;
1282                 gspca_dev->memory = GSPCA_MEMORY_NO;
1283         }
1284         file->private_data = NULL;
1285         module_put(gspca_dev->module);
1286         mutex_unlock(&gspca_dev->queue_lock);
1287
1288         PDEBUG(D_STREAM, "close done");
1289
1290         return 0;
1291 }
1292
1293 static int vidioc_querycap(struct file *file, void  *priv,
1294                            struct v4l2_capability *cap)
1295 {
1296         struct gspca_dev *gspca_dev = priv;
1297         int ret;
1298
1299         /* protect the access to the usb device */
1300         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1301                 return -ERESTARTSYS;
1302         if (!gspca_dev->present) {
1303                 ret = -ENODEV;
1304                 goto out;
1305         }
1306         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1307         if (gspca_dev->dev->product != NULL) {
1308                 strncpy(cap->card, gspca_dev->dev->product,
1309                         sizeof cap->card);
1310         } else {
1311                 snprintf(cap->card, sizeof cap->card,
1312                         "USB Camera (%04x:%04x)",
1313                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1314                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1315         }
1316         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1317         cap->version = DRIVER_VERSION_NUMBER;
1318         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1319                           | V4L2_CAP_STREAMING
1320                           | V4L2_CAP_READWRITE;
1321         ret = 0;
1322 out:
1323         mutex_unlock(&gspca_dev->usb_lock);
1324         return ret;
1325 }
1326
1327 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1328                                    int id)
1329 {
1330         const struct ctrl *ctrls;
1331         int i;
1332
1333         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1334              i < gspca_dev->sd_desc->nctrls;
1335              i++, ctrls++) {
1336                 if (gspca_dev->ctrl_dis & (1 << i))
1337                         continue;
1338                 if (id == ctrls->qctrl.id)
1339                         return ctrls;
1340         }
1341         return NULL;
1342 }
1343
1344 static int vidioc_queryctrl(struct file *file, void *priv,
1345                            struct v4l2_queryctrl *q_ctrl)
1346 {
1347         struct gspca_dev *gspca_dev = priv;
1348         const struct ctrl *ctrls;
1349         int i;
1350         u32 id;
1351
1352         ctrls = NULL;
1353         id = q_ctrl->id;
1354         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1355                 id &= V4L2_CTRL_ID_MASK;
1356                 id++;
1357                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1358                         if (gspca_dev->ctrl_dis & (1 << i))
1359                                 continue;
1360                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1361                                 continue;
1362                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1363                                             > ctrls->qctrl.id)
1364                                 continue;
1365                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1366                 }
1367                 if (ctrls == NULL)
1368                         return -EINVAL;
1369         } else {
1370                 ctrls = get_ctrl(gspca_dev, id);
1371                 if (ctrls == NULL)
1372                         return -EINVAL;
1373                 i = ctrls - gspca_dev->sd_desc->ctrls;
1374         }
1375         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1376         if (gspca_dev->ctrl_inac & (1 << i))
1377                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1378         return 0;
1379 }
1380
1381 static int vidioc_s_ctrl(struct file *file, void *priv,
1382                          struct v4l2_control *ctrl)
1383 {
1384         struct gspca_dev *gspca_dev = priv;
1385         const struct ctrl *ctrls;
1386         int ret;
1387
1388         ctrls = get_ctrl(gspca_dev, ctrl->id);
1389         if (ctrls == NULL)
1390                 return -EINVAL;
1391
1392         if (ctrl->value < ctrls->qctrl.minimum
1393             || ctrl->value > ctrls->qctrl.maximum)
1394                 return -ERANGE;
1395         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1396         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1397                 return -ERESTARTSYS;
1398         gspca_dev->usb_err = 0;
1399         if (gspca_dev->present)
1400                 ret = ctrls->set(gspca_dev, ctrl->value);
1401         else
1402                 ret = -ENODEV;
1403         mutex_unlock(&gspca_dev->usb_lock);
1404         return ret;
1405 }
1406
1407 static int vidioc_g_ctrl(struct file *file, void *priv,
1408                          struct v4l2_control *ctrl)
1409 {
1410         struct gspca_dev *gspca_dev = priv;
1411         const struct ctrl *ctrls;
1412         int ret;
1413
1414         ctrls = get_ctrl(gspca_dev, ctrl->id);
1415         if (ctrls == NULL)
1416                 return -EINVAL;
1417
1418         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1419                 return -ERESTARTSYS;
1420         gspca_dev->usb_err = 0;
1421         if (gspca_dev->present)
1422                 ret = ctrls->get(gspca_dev, &ctrl->value);
1423         else
1424                 ret = -ENODEV;
1425         mutex_unlock(&gspca_dev->usb_lock);
1426         return ret;
1427 }
1428
1429 /*fixme: have an audio flag in gspca_dev?*/
1430 static int vidioc_s_audio(struct file *file, void *priv,
1431                          struct v4l2_audio *audio)
1432 {
1433         if (audio->index != 0)
1434                 return -EINVAL;
1435         return 0;
1436 }
1437
1438 static int vidioc_g_audio(struct file *file, void *priv,
1439                          struct v4l2_audio *audio)
1440 {
1441         strcpy(audio->name, "Microphone");
1442         return 0;
1443 }
1444
1445 static int vidioc_enumaudio(struct file *file, void *priv,
1446                          struct v4l2_audio *audio)
1447 {
1448         if (audio->index != 0)
1449                 return -EINVAL;
1450
1451         strcpy(audio->name, "Microphone");
1452         audio->capability = 0;
1453         audio->mode = 0;
1454         return 0;
1455 }
1456
1457 static int vidioc_querymenu(struct file *file, void *priv,
1458                             struct v4l2_querymenu *qmenu)
1459 {
1460         struct gspca_dev *gspca_dev = priv;
1461
1462         if (!gspca_dev->sd_desc->querymenu)
1463                 return -EINVAL;
1464         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1465 }
1466
1467 static int vidioc_enum_input(struct file *file, void *priv,
1468                                 struct v4l2_input *input)
1469 {
1470         struct gspca_dev *gspca_dev = priv;
1471
1472         if (input->index != 0)
1473                 return -EINVAL;
1474         input->type = V4L2_INPUT_TYPE_CAMERA;
1475         input->status = gspca_dev->cam.input_flags;
1476         strncpy(input->name, gspca_dev->sd_desc->name,
1477                 sizeof input->name);
1478         return 0;
1479 }
1480
1481 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1482 {
1483         *i = 0;
1484         return 0;
1485 }
1486
1487 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1488 {
1489         if (i > 0)
1490                 return -EINVAL;
1491         return (0);
1492 }
1493
1494 static int vidioc_reqbufs(struct file *file, void *priv,
1495                           struct v4l2_requestbuffers *rb)
1496 {
1497         struct gspca_dev *gspca_dev = priv;
1498         int i, ret = 0;
1499
1500         switch (rb->memory) {
1501         case GSPCA_MEMORY_READ:                 /* (internal call) */
1502         case V4L2_MEMORY_MMAP:
1503         case V4L2_MEMORY_USERPTR:
1504                 break;
1505         default:
1506                 return -EINVAL;
1507         }
1508         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1509                 return -ERESTARTSYS;
1510
1511         if (gspca_dev->memory != GSPCA_MEMORY_NO
1512             && gspca_dev->memory != rb->memory) {
1513                 ret = -EBUSY;
1514                 goto out;
1515         }
1516
1517         /* only one file may do the capture */
1518         if (gspca_dev->capt_file != NULL
1519             && gspca_dev->capt_file != file) {
1520                 ret = -EBUSY;
1521                 goto out;
1522         }
1523
1524         /* if allocated, the buffers must not be mapped */
1525         for (i = 0; i < gspca_dev->nframes; i++) {
1526                 if (gspca_dev->frame[i].vma_use_count) {
1527                         ret = -EBUSY;
1528                         goto out;
1529                 }
1530         }
1531
1532         /* stop streaming */
1533         if (gspca_dev->streaming) {
1534                 mutex_lock(&gspca_dev->usb_lock);
1535                 gspca_dev->usb_err = 0;
1536                 gspca_stream_off(gspca_dev);
1537                 mutex_unlock(&gspca_dev->usb_lock);
1538         }
1539
1540         /* free the previous allocated buffers, if any */
1541         if (gspca_dev->nframes != 0) {
1542                 frame_free(gspca_dev);
1543                 gspca_dev->capt_file = NULL;
1544         }
1545         if (rb->count == 0)                     /* unrequest */
1546                 goto out;
1547         gspca_dev->memory = rb->memory;
1548         ret = frame_alloc(gspca_dev, rb->count);
1549         if (ret == 0) {
1550                 rb->count = gspca_dev->nframes;
1551                 gspca_dev->capt_file = file;
1552         }
1553 out:
1554         mutex_unlock(&gspca_dev->queue_lock);
1555         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1556         return ret;
1557 }
1558
1559 static int vidioc_querybuf(struct file *file, void *priv,
1560                            struct v4l2_buffer *v4l2_buf)
1561 {
1562         struct gspca_dev *gspca_dev = priv;
1563         struct gspca_frame *frame;
1564
1565         if (v4l2_buf->index < 0
1566             || v4l2_buf->index >= gspca_dev->nframes)
1567                 return -EINVAL;
1568
1569         frame = &gspca_dev->frame[v4l2_buf->index];
1570         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1571         return 0;
1572 }
1573
1574 static int vidioc_streamon(struct file *file, void *priv,
1575                            enum v4l2_buf_type buf_type)
1576 {
1577         struct gspca_dev *gspca_dev = priv;
1578         int ret;
1579
1580         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1581                 return -EINVAL;
1582         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1583                 return -ERESTARTSYS;
1584
1585         if (gspca_dev->nframes == 0
1586             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1587                 ret = -EINVAL;
1588                 goto out;
1589         }
1590         if (!gspca_dev->streaming) {
1591                 ret = gspca_init_transfer(gspca_dev);
1592                 if (ret < 0)
1593                         goto out;
1594         }
1595 #ifdef GSPCA_DEBUG
1596         if (gspca_debug & D_STREAM) {
1597                 PDEBUG_MODE("stream on OK",
1598                         gspca_dev->pixfmt,
1599                         gspca_dev->width,
1600                         gspca_dev->height);
1601         }
1602 #endif
1603         ret = 0;
1604 out:
1605         mutex_unlock(&gspca_dev->queue_lock);
1606         return ret;
1607 }
1608
1609 static int vidioc_streamoff(struct file *file, void *priv,
1610                                 enum v4l2_buf_type buf_type)
1611 {
1612         struct gspca_dev *gspca_dev = priv;
1613         int i, ret;
1614
1615         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1616                 return -EINVAL;
1617         if (!gspca_dev->streaming)
1618                 return 0;
1619         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1620                 return -ERESTARTSYS;
1621
1622         /* stop streaming */
1623         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1624                 ret = -ERESTARTSYS;
1625                 goto out;
1626         }
1627         gspca_dev->usb_err = 0;
1628         gspca_stream_off(gspca_dev);
1629         mutex_unlock(&gspca_dev->usb_lock);
1630
1631         /* empty the application queues */
1632         for (i = 0; i < gspca_dev->nframes; i++)
1633                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1634         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1635         gspca_dev->last_packet_type = DISCARD_PACKET;
1636         gspca_dev->sequence = 0;
1637         ret = 0;
1638 out:
1639         mutex_unlock(&gspca_dev->queue_lock);
1640         return ret;
1641 }
1642
1643 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1644                         struct v4l2_jpegcompression *jpegcomp)
1645 {
1646         struct gspca_dev *gspca_dev = priv;
1647         int ret;
1648
1649         if (!gspca_dev->sd_desc->get_jcomp)
1650                 return -EINVAL;
1651         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1652                 return -ERESTARTSYS;
1653         gspca_dev->usb_err = 0;
1654         if (gspca_dev->present)
1655                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1656         else
1657                 ret = -ENODEV;
1658         mutex_unlock(&gspca_dev->usb_lock);
1659         return ret;
1660 }
1661
1662 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1663                         struct v4l2_jpegcompression *jpegcomp)
1664 {
1665         struct gspca_dev *gspca_dev = priv;
1666         int ret;
1667
1668         if (!gspca_dev->sd_desc->set_jcomp)
1669                 return -EINVAL;
1670         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1671                 return -ERESTARTSYS;
1672         gspca_dev->usb_err = 0;
1673         if (gspca_dev->present)
1674                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1675         else
1676                 ret = -ENODEV;
1677         mutex_unlock(&gspca_dev->usb_lock);
1678         return ret;
1679 }
1680
1681 static int vidioc_g_parm(struct file *filp, void *priv,
1682                         struct v4l2_streamparm *parm)
1683 {
1684         struct gspca_dev *gspca_dev = priv;
1685
1686         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1687
1688         if (gspca_dev->sd_desc->get_streamparm) {
1689                 int ret;
1690
1691                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1692                         return -ERESTARTSYS;
1693                 gspca_dev->usb_err = 0;
1694                 if (gspca_dev->present)
1695                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1696                                                                  parm);
1697                 else
1698                         ret = -ENODEV;
1699                 mutex_unlock(&gspca_dev->usb_lock);
1700                 return ret;
1701         }
1702
1703         return 0;
1704 }
1705
1706 static int vidioc_s_parm(struct file *filp, void *priv,
1707                         struct v4l2_streamparm *parm)
1708 {
1709         struct gspca_dev *gspca_dev = priv;
1710         int n;
1711
1712         n = parm->parm.capture.readbuffers;
1713         if (n == 0 || n > GSPCA_MAX_FRAMES)
1714                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1715         else
1716                 gspca_dev->nbufread = n;
1717
1718         if (gspca_dev->sd_desc->set_streamparm) {
1719                 int ret;
1720
1721                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1722                         return -ERESTARTSYS;
1723                 gspca_dev->usb_err = 0;
1724                 if (gspca_dev->present)
1725                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1726                                                                  parm);
1727                 else
1728                         ret = -ENODEV;
1729                 mutex_unlock(&gspca_dev->usb_lock);
1730                 return ret;
1731         }
1732
1733         return 0;
1734 }
1735
1736 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1737 static int vidiocgmbuf(struct file *file, void *priv,
1738                         struct video_mbuf *mbuf)
1739 {
1740         struct gspca_dev *gspca_dev = file->private_data;
1741         int i;
1742
1743         PDEBUG(D_STREAM, "cgmbuf");
1744         if (gspca_dev->nframes == 0) {
1745                 int ret;
1746
1747                 {
1748                         struct v4l2_format fmt;
1749
1750                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1751                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1752                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1753                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1754                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1755                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1756                         if (ret != 0)
1757                                 return ret;
1758                 }
1759                 {
1760                         struct v4l2_requestbuffers rb;
1761
1762                         memset(&rb, 0, sizeof rb);
1763                         rb.count = 4;
1764                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1765                         rb.memory = V4L2_MEMORY_MMAP;
1766                         ret = vidioc_reqbufs(file, priv, &rb);
1767                         if (ret != 0)
1768                                 return ret;
1769                 }
1770         }
1771         mbuf->frames = gspca_dev->nframes;
1772         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1773         for (i = 0; i < mbuf->frames; i++)
1774                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1775         return 0;
1776 }
1777 #endif
1778
1779 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1780 {
1781         struct gspca_dev *gspca_dev = file->private_data;
1782         struct gspca_frame *frame;
1783         struct page *page;
1784         unsigned long addr, start, size;
1785         int i, ret;
1786
1787         start = vma->vm_start;
1788         size = vma->vm_end - vma->vm_start;
1789         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1790
1791         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1792                 return -ERESTARTSYS;
1793         if (!gspca_dev->present) {
1794                 ret = -ENODEV;
1795                 goto out;
1796         }
1797         if (gspca_dev->capt_file != file) {
1798                 ret = -EINVAL;
1799                 goto out;
1800         }
1801
1802         frame = NULL;
1803         for (i = 0; i < gspca_dev->nframes; ++i) {
1804                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1805                         PDEBUG(D_STREAM, "mmap bad memory type");
1806                         break;
1807                 }
1808                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1809                                                 == vma->vm_pgoff) {
1810                         frame = &gspca_dev->frame[i];
1811                         break;
1812                 }
1813         }
1814         if (frame == NULL) {
1815                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1816                 ret = -EINVAL;
1817                 goto out;
1818         }
1819 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1820         /* v4l1 maps all the buffers */
1821         if (i != 0
1822             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1823 #endif
1824             if (size != frame->v4l2_buf.length) {
1825                 PDEBUG(D_STREAM, "mmap bad size");
1826                 ret = -EINVAL;
1827                 goto out;
1828         }
1829
1830         /*
1831          * - VM_IO marks the area as being a mmaped region for I/O to a
1832          *   device. It also prevents the region from being core dumped.
1833          */
1834         vma->vm_flags |= VM_IO;
1835
1836         addr = (unsigned long) frame->data;
1837         while (size > 0) {
1838                 page = vmalloc_to_page((void *) addr);
1839                 ret = vm_insert_page(vma, start, page);
1840                 if (ret < 0)
1841                         goto out;
1842                 start += PAGE_SIZE;
1843                 addr += PAGE_SIZE;
1844                 size -= PAGE_SIZE;
1845         }
1846
1847         vma->vm_ops = &gspca_vm_ops;
1848         vma->vm_private_data = frame;
1849         gspca_vm_open(vma);
1850         ret = 0;
1851 out:
1852         mutex_unlock(&gspca_dev->queue_lock);
1853         return ret;
1854 }
1855
1856 /*
1857  * wait for a video frame
1858  *
1859  * If a frame is ready, its index is returned.
1860  */
1861 static int frame_wait(struct gspca_dev *gspca_dev,
1862                         int nonblock_ing)
1863 {
1864         struct gspca_frame *frame;
1865         int i, j, ret;
1866
1867         /* check if a frame is ready */
1868         i = gspca_dev->fr_o;
1869         j = gspca_dev->fr_queue[i];
1870         frame = &gspca_dev->frame[j];
1871
1872         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1873                 if (nonblock_ing)
1874                         return -EAGAIN;
1875
1876                 /* wait till a frame is ready */
1877                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1878                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1879                         !gspca_dev->streaming || !gspca_dev->present,
1880                         msecs_to_jiffies(3000));
1881                 if (ret < 0)
1882                         return ret;
1883                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1884                         return -EIO;
1885         }
1886
1887         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1888         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1889                 gspca_dev->fr_q,
1890                 gspca_dev->fr_i,
1891                 gspca_dev->fr_o);
1892
1893         if (gspca_dev->sd_desc->dq_callback) {
1894                 mutex_lock(&gspca_dev->usb_lock);
1895                 gspca_dev->usb_err = 0;
1896                 if (gspca_dev->present)
1897                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1898                 mutex_unlock(&gspca_dev->usb_lock);
1899         }
1900         return j;
1901 }
1902
1903 /*
1904  * dequeue a video buffer
1905  *
1906  * If nonblock_ing is false, block until a buffer is available.
1907  */
1908 static int vidioc_dqbuf(struct file *file, void *priv,
1909                         struct v4l2_buffer *v4l2_buf)
1910 {
1911         struct gspca_dev *gspca_dev = priv;
1912         struct gspca_frame *frame;
1913         int i, ret;
1914
1915         PDEBUG(D_FRAM, "dqbuf");
1916         if (v4l2_buf->memory != gspca_dev->memory)
1917                 return -EINVAL;
1918
1919         if (!gspca_dev->present)
1920                 return -ENODEV;
1921
1922         /* if not streaming, be sure the application will not loop forever */
1923         if (!(file->f_flags & O_NONBLOCK)
1924             && !gspca_dev->streaming && gspca_dev->users == 1)
1925                 return -EINVAL;
1926
1927         /* only the capturing file may dequeue */
1928         if (gspca_dev->capt_file != file)
1929                 return -EINVAL;
1930
1931         /* only one dequeue / read at a time */
1932         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1933                 return -ERESTARTSYS;
1934
1935         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1936         if (ret < 0)
1937                 goto out;
1938         i = ret;                                /* frame index */
1939         frame = &gspca_dev->frame[i];
1940         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1941                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1942                                  frame->data,
1943                                  frame->v4l2_buf.bytesused)) {
1944                         PDEBUG(D_ERR|D_STREAM,
1945                                 "dqbuf cp to user failed");
1946                         ret = -EFAULT;
1947                         goto out;
1948                 }
1949         }
1950         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1951         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1952         PDEBUG(D_FRAM, "dqbuf %d", i);
1953         ret = 0;
1954 out:
1955         mutex_unlock(&gspca_dev->read_lock);
1956         return ret;
1957 }
1958
1959 /*
1960  * queue a video buffer
1961  *
1962  * Attempting to queue a buffer that has already been
1963  * queued will return -EINVAL.
1964  */
1965 static int vidioc_qbuf(struct file *file, void *priv,
1966                         struct v4l2_buffer *v4l2_buf)
1967 {
1968         struct gspca_dev *gspca_dev = priv;
1969         struct gspca_frame *frame;
1970         int i, index, ret;
1971
1972         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1973
1974         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1975                 return -ERESTARTSYS;
1976
1977         index = v4l2_buf->index;
1978         if ((unsigned) index >= gspca_dev->nframes) {
1979                 PDEBUG(D_FRAM,
1980                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1981                 ret = -EINVAL;
1982                 goto out;
1983         }
1984         if (v4l2_buf->memory != gspca_dev->memory) {
1985                 PDEBUG(D_FRAM, "qbuf bad memory type");
1986                 ret = -EINVAL;
1987                 goto out;
1988         }
1989
1990         frame = &gspca_dev->frame[index];
1991         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1992                 PDEBUG(D_FRAM, "qbuf bad state");
1993                 ret = -EINVAL;
1994                 goto out;
1995         }
1996
1997         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1998
1999         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2000                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2001                 frame->v4l2_buf.length = v4l2_buf->length;
2002         }
2003
2004         /* put the buffer in the 'queued' queue */
2005         i = gspca_dev->fr_q;
2006         gspca_dev->fr_queue[i] = index;
2007         if (gspca_dev->fr_i == i)
2008                 gspca_dev->cur_frame = frame;
2009         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
2010         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
2011                 gspca_dev->fr_q,
2012                 gspca_dev->fr_i,
2013                 gspca_dev->fr_o);
2014
2015         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2016         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2017         ret = 0;
2018 out:
2019         mutex_unlock(&gspca_dev->queue_lock);
2020         return ret;
2021 }
2022
2023 /*
2024  * allocate the resources for read()
2025  */
2026 static int read_alloc(struct gspca_dev *gspca_dev,
2027                         struct file *file)
2028 {
2029         struct v4l2_buffer v4l2_buf;
2030         int i, ret;
2031
2032         PDEBUG(D_STREAM, "read alloc");
2033         if (gspca_dev->nframes == 0) {
2034                 struct v4l2_requestbuffers rb;
2035
2036                 memset(&rb, 0, sizeof rb);
2037                 rb.count = gspca_dev->nbufread;
2038                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2039                 rb.memory = GSPCA_MEMORY_READ;
2040                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2041                 if (ret != 0) {
2042                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2043                         return ret;
2044                 }
2045                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2046                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2047                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2048                 for (i = 0; i < gspca_dev->nbufread; i++) {
2049                         v4l2_buf.index = i;
2050                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2051                         if (ret != 0) {
2052                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2053                                 return ret;
2054                         }
2055                 }
2056                 gspca_dev->memory = GSPCA_MEMORY_READ;
2057         }
2058
2059         /* start streaming */
2060         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2061         if (ret != 0)
2062                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2063         return ret;
2064 }
2065
2066 static unsigned int dev_poll(struct file *file, poll_table *wait)
2067 {
2068         struct gspca_dev *gspca_dev = file->private_data;
2069         int i, ret;
2070
2071         PDEBUG(D_FRAM, "poll");
2072
2073         poll_wait(file, &gspca_dev->wq, wait);
2074
2075         /* if reqbufs is not done, the user would use read() */
2076         if (gspca_dev->nframes == 0) {
2077                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2078                         return POLLERR;         /* not the 1st time */
2079                 ret = read_alloc(gspca_dev, file);
2080                 if (ret != 0)
2081                         return POLLERR;
2082         }
2083
2084         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2085                 return POLLERR;
2086
2087         /* check the next incoming buffer */
2088         i = gspca_dev->fr_o;
2089         i = gspca_dev->fr_queue[i];
2090         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
2091                 ret = POLLIN | POLLRDNORM;      /* something to read */
2092         else
2093                 ret = 0;
2094         mutex_unlock(&gspca_dev->queue_lock);
2095         if (!gspca_dev->present)
2096                 return POLLHUP;
2097         return ret;
2098 }
2099
2100 static ssize_t dev_read(struct file *file, char __user *data,
2101                     size_t count, loff_t *ppos)
2102 {
2103         struct gspca_dev *gspca_dev = file->private_data;
2104         struct gspca_frame *frame;
2105         struct v4l2_buffer v4l2_buf;
2106         struct timeval timestamp;
2107         int n, ret, ret2;
2108
2109         PDEBUG(D_FRAM, "read (%zd)", count);
2110         if (!gspca_dev->present)
2111                 return -ENODEV;
2112         switch (gspca_dev->memory) {
2113         case GSPCA_MEMORY_NO:                   /* first time */
2114                 ret = read_alloc(gspca_dev, file);
2115                 if (ret != 0)
2116                         return ret;
2117                 break;
2118         case GSPCA_MEMORY_READ:
2119                 if (gspca_dev->capt_file == file)
2120                         break;
2121                 /* fall thru */
2122         default:
2123                 return -EINVAL;
2124         }
2125
2126         /* get a frame */
2127         jiffies_to_timeval(get_jiffies_64(), &timestamp);
2128         timestamp.tv_sec--;
2129         n = 2;
2130         for (;;) {
2131                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2132                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2133                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2134                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2135                 if (ret != 0) {
2136                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2137                         return ret;
2138                 }
2139
2140                 /* if the process slept for more than 1 second,
2141                  * get a newer frame */
2142                 frame = &gspca_dev->frame[v4l2_buf.index];
2143                 if (--n < 0)
2144                         break;                  /* avoid infinite loop */
2145                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2146                         break;
2147                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2148                 if (ret != 0) {
2149                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2150                         return ret;
2151                 }
2152         }
2153
2154         /* copy the frame */
2155         if (count > frame->v4l2_buf.bytesused)
2156                 count = frame->v4l2_buf.bytesused;
2157         ret = copy_to_user(data, frame->data, count);
2158         if (ret != 0) {
2159                 PDEBUG(D_ERR|D_STREAM,
2160                         "read cp to user lack %d / %zd", ret, count);
2161                 ret = -EFAULT;
2162                 goto out;
2163         }
2164         ret = count;
2165 out:
2166         /* in each case, requeue the buffer */
2167         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2168         if (ret2 != 0)
2169                 return ret2;
2170         return ret;
2171 }
2172
2173 static struct v4l2_file_operations dev_fops = {
2174         .owner = THIS_MODULE,
2175         .open = dev_open,
2176         .release = dev_close,
2177         .read = dev_read,
2178         .mmap = dev_mmap,
2179         .unlocked_ioctl = video_ioctl2,
2180         .poll   = dev_poll,
2181 };
2182
2183 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2184         .vidioc_querycap        = vidioc_querycap,
2185         .vidioc_dqbuf           = vidioc_dqbuf,
2186         .vidioc_qbuf            = vidioc_qbuf,
2187         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2188         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2189         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2190         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2191         .vidioc_streamon        = vidioc_streamon,
2192         .vidioc_queryctrl       = vidioc_queryctrl,
2193         .vidioc_g_ctrl          = vidioc_g_ctrl,
2194         .vidioc_s_ctrl          = vidioc_s_ctrl,
2195         .vidioc_g_audio         = vidioc_g_audio,
2196         .vidioc_s_audio         = vidioc_s_audio,
2197         .vidioc_enumaudio       = vidioc_enumaudio,
2198         .vidioc_querymenu       = vidioc_querymenu,
2199         .vidioc_enum_input      = vidioc_enum_input,
2200         .vidioc_g_input         = vidioc_g_input,
2201         .vidioc_s_input         = vidioc_s_input,
2202         .vidioc_reqbufs         = vidioc_reqbufs,
2203         .vidioc_querybuf        = vidioc_querybuf,
2204         .vidioc_streamoff       = vidioc_streamoff,
2205         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2206         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2207         .vidioc_g_parm          = vidioc_g_parm,
2208         .vidioc_s_parm          = vidioc_s_parm,
2209         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2210         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2211 #ifdef CONFIG_VIDEO_ADV_DEBUG
2212         .vidioc_g_register      = vidioc_g_register,
2213         .vidioc_s_register      = vidioc_s_register,
2214 #endif
2215         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2216 #ifdef CONFIG_VIDEO_V4L1_COMPAT
2217         .vidiocgmbuf          = vidiocgmbuf,
2218 #endif
2219 };
2220
2221 static struct video_device gspca_template = {
2222         .name = "gspca main driver",
2223         .fops = &dev_fops,
2224         .ioctl_ops = &dev_ioctl_ops,
2225         .release = gspca_release,
2226 };
2227
2228 /*
2229  * probe and create a new gspca device
2230  *
2231  * This function must be called by the sub-driver when it is
2232  * called for probing a new device.
2233  */
2234 int gspca_dev_probe(struct usb_interface *intf,
2235                 const struct usb_device_id *id,
2236                 const struct sd_desc *sd_desc,
2237                 int dev_size,
2238                 struct module *module)
2239 {
2240         struct usb_interface_descriptor *interface;
2241         struct gspca_dev *gspca_dev;
2242         struct usb_device *dev = interface_to_usbdev(intf);
2243         int ret;
2244
2245         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2246
2247         /* we don't handle multi-config cameras */
2248         if (dev->descriptor.bNumConfigurations != 1) {
2249                 PDEBUG(D_ERR, "Too many config");
2250                 return -ENODEV;
2251         }
2252
2253         /* the USB video interface must be the first one */
2254         interface = &intf->cur_altsetting->desc;
2255         if (dev->config->desc.bNumInterfaces != 1 &&
2256             interface->bInterfaceNumber != 0)
2257                 return -ENODEV;
2258
2259         /* create the device */
2260         if (dev_size < sizeof *gspca_dev)
2261                 dev_size = sizeof *gspca_dev;
2262         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2263         if (!gspca_dev) {
2264                 err("couldn't kzalloc gspca struct");
2265                 return -ENOMEM;
2266         }
2267         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2268         if (!gspca_dev->usb_buf) {
2269                 err("out of memory");
2270                 ret = -ENOMEM;
2271                 goto out;
2272         }
2273         gspca_dev->dev = dev;
2274         gspca_dev->iface = interface->bInterfaceNumber;
2275         gspca_dev->nbalt = intf->num_altsetting;
2276         gspca_dev->sd_desc = sd_desc;
2277         gspca_dev->nbufread = 2;
2278         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2279
2280         /* configure the subdriver and initialize the USB device */
2281         ret = sd_desc->config(gspca_dev, id);
2282         if (ret < 0)
2283                 goto out;
2284         ret = sd_desc->init(gspca_dev);
2285         if (ret < 0)
2286                 goto out;
2287         gspca_set_default_mode(gspca_dev);
2288
2289         ret = gspca_input_connect(gspca_dev);
2290         if (ret)
2291                 goto out;
2292
2293         mutex_init(&gspca_dev->usb_lock);
2294         mutex_init(&gspca_dev->read_lock);
2295         mutex_init(&gspca_dev->queue_lock);
2296         init_waitqueue_head(&gspca_dev->wq);
2297
2298         /* init video stuff */
2299         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2300         gspca_dev->vdev.parent = &intf->dev;
2301         gspca_dev->module = module;
2302         gspca_dev->present = 1;
2303         ret = video_register_device(&gspca_dev->vdev,
2304                                   VFL_TYPE_GRABBER,
2305                                   -1);
2306         if (ret < 0) {
2307                 err("video_register_device err %d", ret);
2308                 goto out;
2309         }
2310
2311         usb_set_intfdata(intf, gspca_dev);
2312         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2313
2314         gspca_input_create_urb(gspca_dev);
2315
2316         return 0;
2317 out:
2318 #ifdef CONFIG_INPUT
2319         if (gspca_dev->input_dev)
2320                 input_unregister_device(gspca_dev->input_dev);
2321 #endif
2322         kfree(gspca_dev->usb_buf);
2323         kfree(gspca_dev);
2324         return ret;
2325 }
2326 EXPORT_SYMBOL(gspca_dev_probe);
2327
2328 /*
2329  * USB disconnection
2330  *
2331  * This function must be called by the sub-driver
2332  * when the device disconnects, after the specific resources are freed.
2333  */
2334 void gspca_disconnect(struct usb_interface *intf)
2335 {
2336         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2337 #ifdef CONFIG_INPUT
2338         struct input_dev *input_dev;
2339 #endif
2340
2341         PDEBUG(D_PROBE, "%s disconnect",
2342                 video_device_node_name(&gspca_dev->vdev));
2343         mutex_lock(&gspca_dev->usb_lock);
2344         gspca_dev->present = 0;
2345
2346         if (gspca_dev->streaming) {
2347                 destroy_urbs(gspca_dev);
2348                 wake_up_interruptible(&gspca_dev->wq);
2349         }
2350
2351 #ifdef CONFIG_INPUT
2352         gspca_input_destroy_urb(gspca_dev);
2353         input_dev = gspca_dev->input_dev;
2354         if (input_dev) {
2355                 gspca_dev->input_dev = NULL;
2356                 input_unregister_device(input_dev);
2357         }
2358 #endif
2359
2360         /* the device is freed at exit of this function */
2361         gspca_dev->dev = NULL;
2362         mutex_unlock(&gspca_dev->usb_lock);
2363
2364         usb_set_intfdata(intf, NULL);
2365
2366         /* release the device */
2367         /* (this will call gspca_release() immediatly or on last close) */
2368         video_unregister_device(&gspca_dev->vdev);
2369
2370 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2371 }
2372 EXPORT_SYMBOL(gspca_disconnect);
2373
2374 #ifdef CONFIG_PM
2375 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2376 {
2377         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2378
2379         if (!gspca_dev->streaming)
2380                 return 0;
2381         gspca_dev->frozen = 1;          /* avoid urb error messages */
2382         if (gspca_dev->sd_desc->stopN)
2383                 gspca_dev->sd_desc->stopN(gspca_dev);
2384         destroy_urbs(gspca_dev);
2385         gspca_input_destroy_urb(gspca_dev);
2386         gspca_set_alt0(gspca_dev);
2387         if (gspca_dev->sd_desc->stop0)
2388                 gspca_dev->sd_desc->stop0(gspca_dev);
2389         return 0;
2390 }
2391 EXPORT_SYMBOL(gspca_suspend);
2392
2393 int gspca_resume(struct usb_interface *intf)
2394 {
2395         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2396
2397         gspca_dev->frozen = 0;
2398         gspca_dev->sd_desc->init(gspca_dev);
2399         gspca_input_create_urb(gspca_dev);
2400         if (gspca_dev->streaming)
2401                 return gspca_init_transfer(gspca_dev);
2402         return 0;
2403 }
2404 EXPORT_SYMBOL(gspca_resume);
2405 #endif
2406 /* -- cam driver utility functions -- */
2407
2408 /* auto gain and exposure algorithm based on the knee algorithm described here:
2409    http://ytse.tricolour.net/docs/LowLightOptimization.html
2410
2411    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2412    where changed. */
2413 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2414         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2415 {
2416         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2417         const struct ctrl *gain_ctrl = NULL;
2418         const struct ctrl *exposure_ctrl = NULL;
2419         const struct ctrl *autogain_ctrl = NULL;
2420         int retval = 0;
2421
2422         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2423                 if (gspca_dev->ctrl_dis & (1 << i))
2424                         continue;
2425                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2426                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2427                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2428                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2429                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2430                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2431         }
2432         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2433                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2434                         "on cam without (auto)gain/exposure");
2435                 return 0;
2436         }
2437
2438         if (gain_ctrl->get(gspca_dev, &gain) ||
2439                         exposure_ctrl->get(gspca_dev, &exposure) ||
2440                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2441                 return 0;
2442
2443         orig_gain = gain;
2444         orig_exposure = exposure;
2445
2446         /* If we are of a multiple of deadzone, do multiple steps to reach the
2447            desired lumination fast (with the risc of a slight overshoot) */
2448         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2449
2450         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2451                 avg_lum, desired_avg_lum, steps);
2452
2453         for (i = 0; i < steps; i++) {
2454                 if (avg_lum > desired_avg_lum) {
2455                         if (gain > gain_knee)
2456                                 gain--;
2457                         else if (exposure > exposure_knee)
2458                                 exposure--;
2459                         else if (gain > gain_ctrl->qctrl.default_value)
2460                                 gain--;
2461                         else if (exposure > exposure_ctrl->qctrl.minimum)
2462                                 exposure--;
2463                         else if (gain > gain_ctrl->qctrl.minimum)
2464                                 gain--;
2465                         else
2466                                 break;
2467                 } else {
2468                         if (gain < gain_ctrl->qctrl.default_value)
2469                                 gain++;
2470                         else if (exposure < exposure_knee)
2471                                 exposure++;
2472                         else if (gain < gain_knee)
2473                                 gain++;
2474                         else if (exposure < exposure_ctrl->qctrl.maximum)
2475                                 exposure++;
2476                         else if (gain < gain_ctrl->qctrl.maximum)
2477                                 gain++;
2478                         else
2479                                 break;
2480                 }
2481         }
2482
2483         if (gain != orig_gain) {
2484                 gain_ctrl->set(gspca_dev, gain);
2485                 retval = 1;
2486         }
2487         if (exposure != orig_exposure) {
2488                 exposure_ctrl->set(gspca_dev, exposure);
2489                 retval = 1;
2490         }
2491
2492         return retval;
2493 }
2494 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2495
2496 /* -- module insert / remove -- */
2497 static int __init gspca_init(void)
2498 {
2499         info("main v%d.%d.%d registered",
2500                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2501                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2502                 DRIVER_VERSION_NUMBER & 0xff);
2503         return 0;
2504 }
2505 static void __exit gspca_exit(void)
2506 {
2507         info("main deregistered");
2508 }
2509
2510 module_init(gspca_init);
2511 module_exit(gspca_exit);
2512
2513 #ifdef GSPCA_DEBUG
2514 module_param_named(debug, gspca_debug, int, 0644);
2515 MODULE_PARM_DESC(debug,
2516                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2517                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2518                 " 0x0100: v4l2");
2519 #endif