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