drivers/media/video/gspca/gspca.c

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