SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/version.h>
  25 #include <linux/fs.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/string.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/io.h>
  33 #include <asm/page.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/jiffies.h>
  36 #include <media/v4l2-ioctl.h>
  37
  38 #include "gspca.h"
  39
  40 /* global values */
  41 #define DEF_NURBS 3             /* default number of URBs */
  42 #if DEF_NURBS > MAX_NURBS
  43 #error "DEF_NURBS too big"
  44 #endif
  45
  46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 8, 0)
  51
  52 #ifdef GSPCA_DEBUG
  53 int gspca_debug = D_ERR | D_PROBE;
  54 EXPORT_SYMBOL(gspca_debug);
  55
  56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  57 {
  58         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  59                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  60                         txt,
  61                         pixfmt & 0xff,
  62                         (pixfmt >> 8) & 0xff,
  63                         (pixfmt >> 16) & 0xff,
  64                         pixfmt >> 24,
  65                         w, h);
  66         } else {
  67                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  68                         txt,
  69                         pixfmt,
  70                         w, h);
  71         }
  72 }
  73 #else
  74 #define PDEBUG_MODE(txt, pixfmt, w, h)
  75 #endif
  76
  77 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  78 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  79 #define GSPCA_MEMORY_READ 7
  80
  81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  82
  83 /*
  84  * VMA operations.
  85  */
  86 static void gspca_vm_open(struct vm_area_struct *vma)
  87 {
  88         struct gspca_frame *frame = vma->vm_private_data;
  89
  90         frame->vma_use_count++;
  91         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  92 }
  93
  94 static void gspca_vm_close(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         if (--frame->vma_use_count <= 0)
  99                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static const struct vm_operations_struct gspca_vm_ops = {
 103         .open           = gspca_vm_open,
 104         .close          = gspca_vm_close,
 105 };
 106
 107 /* get the current input frame buffer */
 108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 109 {
 110         struct gspca_frame *frame;
 111
 112         frame = gspca_dev->cur_frame;
 113         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 114                                 != V4L2_BUF_FLAG_QUEUED)
 115                 return NULL;
 116         return frame;
 117 }
 118 EXPORT_SYMBOL(gspca_get_i_frame);
 119
 120 /*
 121  * fill a video frame from an URB and resubmit
 122  */
 123 static void fill_frame(struct gspca_dev *gspca_dev,
 124                         struct urb *urb)
 125 {
 126         u8 *data;               /* address of data in the iso message */
 127         int i, len, st;
 128         cam_pkt_op pkt_scan;
 129
 130         if (urb->status != 0) {
 131                 if (urb->status == -ESHUTDOWN)
 132                         return;         /* disconnection */
 133 #ifdef CONFIG_PM
 134                 if (gspca_dev->frozen)
 135                         return;
 136 #endif
 137                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 138                 urb->status = 0;
 139                 goto resubmit;
 140         }
 141         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 142         for (i = 0; i < urb->number_of_packets; i++) {
 143
 144                 /* check the packet status and length */
 145                 len = urb->iso_frame_desc[i].actual_length;
 146                 if (len == 0) {
 147                         if (gspca_dev->empty_packet == 0)
 148                                 gspca_dev->empty_packet = 1;
 149                         continue;
 150                 }
 151                 st = urb->iso_frame_desc[i].status;
 152                 if (st) {
 153                         PDEBUG(D_ERR,
 154                                 "ISOC data error: [%d] len=%d, status=%d",
 155                                 i, len, st);
 156                         gspca_dev->last_packet_type = DISCARD_PACKET;
 157                         continue;
 158                 }
 159
 160                 /* let the packet be analyzed by the subdriver */
 161                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 162                         i, urb->iso_frame_desc[i].offset, len);
 163                 data = (u8 *) urb->transfer_buffer
 164                                         + urb->iso_frame_desc[i].offset;
 165                 pkt_scan(gspca_dev, data, len);
 166         }
 167
 168 resubmit:
 169         /* resubmit the URB */
 170         st = usb_submit_urb(urb, GFP_ATOMIC);
 171         if (st < 0)
 172                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 173 }
 174
 175 /*
 176  * ISOC message interrupt from the USB device
 177  *
 178  * Analyse each packet and call the subdriver for copy to the frame buffer.
 179  */
 180 static void isoc_irq(struct urb *urb)
 181 {
 182         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 183
 184         PDEBUG(D_PACK, "isoc irq");
 185         if (!gspca_dev->streaming)
 186                 return;
 187         fill_frame(gspca_dev, urb);
 188 }
 189
 190 /*
 191  * bulk message interrupt from the USB device
 192  */
 193 static void bulk_irq(struct urb *urb)
 194 {
 195         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 196         int st;
 197
 198         PDEBUG(D_PACK, "bulk irq");
 199         if (!gspca_dev->streaming)
 200                 return;
 201         switch (urb->status) {
 202         case 0:
 203                 break;
 204         case -ESHUTDOWN:
 205                 return;         /* disconnection */
 206         default:
 207 #ifdef CONFIG_PM
 208                 if (gspca_dev->frozen)
 209                         return;
 210 #endif
 211                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 212                 urb->status = 0;
 213                 goto resubmit;
 214         }
 215
 216         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 217         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 218                                 urb->transfer_buffer,
 219                                 urb->actual_length);
 220
 221 resubmit:
 222         /* resubmit the URB */
 223         if (gspca_dev->cam.bulk_nurbs != 0) {
 224                 st = usb_submit_urb(urb, GFP_ATOMIC);
 225                 if (st < 0)
 226                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 227         }
 228 }
 229
 230 /*
 231  * add data to the current frame
 232  *
 233  * This function is called by the subdrivers at interrupt level.
 234  *
 235  * To build a frame, these ones must add
 236  *      - one FIRST_PACKET
 237  *      - 0 or many INTER_PACKETs
 238  *      - one LAST_PACKET
 239  * DISCARD_PACKET invalidates the whole frame.
 240  * On LAST_PACKET, a new frame is returned.
 241  */
 242 void gspca_frame_add(struct gspca_dev *gspca_dev,
 243                         enum gspca_packet_type packet_type,
 244                         const u8 *data,
 245                         int len)
 246 {
 247         struct gspca_frame *frame;
 248         int i, j;
 249
 250         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 251
 252         /* check the availability of the frame buffer */
 253         frame = gspca_dev->cur_frame;
 254         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 255                                         != V4L2_BUF_FLAG_QUEUED) {
 256                 gspca_dev->last_packet_type = DISCARD_PACKET;
 257                 return;
 258         }
 259
 260         /* when start of a new frame, if the current frame buffer
 261          * is not queued, discard the whole frame */
 262         if (packet_type == FIRST_PACKET) {
 263                 frame->data_end = frame->data;
 264                 jiffies_to_timeval(get_jiffies_64(),
 265                                    &frame->v4l2_buf.timestamp);
 266                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 267         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 268                 if (packet_type == LAST_PACKET)
 269                         gspca_dev->last_packet_type = packet_type;
 270                 return;
 271         }
 272
 273         /* append the packet to the frame buffer */
 274         if (len > 0) {
 275                 if (frame->data_end - frame->data + len
 276                                                  > frame->v4l2_buf.length) {
 277                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 278                                 frame->data_end - frame->data + len,
 279                                 frame->v4l2_buf.length);
 280                         packet_type = DISCARD_PACKET;
 281                 } else {
 282                         memcpy(frame->data_end, data, len);
 283                         frame->data_end += len;
 284                 }
 285         }
 286         gspca_dev->last_packet_type = packet_type;
 287
 288         /* if last packet, wake up the application and advance in the queue */
 289         if (packet_type == LAST_PACKET) {
 290                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 291                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 292                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 293                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 294                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 295                 gspca_dev->fr_i = i;
 296                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 297                         frame->v4l2_buf.bytesused,
 298                         gspca_dev->fr_q,
 299                         i,
 300                         gspca_dev->fr_o);
 301                 j = gspca_dev->fr_queue[i];
 302                 gspca_dev->cur_frame = &gspca_dev->frame[j];
 303         }
 304 }
 305 EXPORT_SYMBOL(gspca_frame_add);
 306
 307 static int gspca_is_compressed(__u32 format)
 308 {
 309         switch (format) {
 310         case V4L2_PIX_FMT_MJPEG:
 311         case V4L2_PIX_FMT_JPEG:
 312         case V4L2_PIX_FMT_SPCA561:
 313         case V4L2_PIX_FMT_PAC207:
 314         case V4L2_PIX_FMT_MR97310A:
 315                 return 1;
 316         }
 317         return 0;
 318 }
 319
 320 static void *rvmalloc(long size)
 321 {
 322         void *mem;
 323         unsigned long adr;
 324
 325         mem = vmalloc_32(size);
 326         if (mem != NULL) {
 327                 adr = (unsigned long) mem;
 328                 while (size > 0) {
 329                         SetPageReserved(vmalloc_to_page((void *) adr));
 330                         adr += PAGE_SIZE;
 331                         size -= PAGE_SIZE;
 332                 }
 333         }
 334         return mem;
 335 }
 336
 337 static void rvfree(void *mem, long size)
 338 {
 339         unsigned long adr;
 340
 341         adr = (unsigned long) mem;
 342         while (size > 0) {
 343                 ClearPageReserved(vmalloc_to_page((void *) adr));
 344                 adr += PAGE_SIZE;
 345                 size -= PAGE_SIZE;
 346         }
 347         vfree(mem);
 348 }
 349
 350 static int frame_alloc(struct gspca_dev *gspca_dev,
 351                         unsigned int count)
 352 {
 353         struct gspca_frame *frame;
 354         unsigned int frsz;
 355         int i;
 356
 357         i = gspca_dev->curr_mode;
 358         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 359         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 360         frsz = PAGE_ALIGN(frsz);
 361         gspca_dev->frsz = frsz;
 362         if (count > GSPCA_MAX_FRAMES)
 363                 count = GSPCA_MAX_FRAMES;
 364         gspca_dev->frbuf = rvmalloc(frsz * count);
 365         if (!gspca_dev->frbuf) {
 366                 err("frame alloc failed");
 367                 return -ENOMEM;
 368         }
 369         gspca_dev->nframes = count;
 370         for (i = 0; i < count; i++) {
 371                 frame = &gspca_dev->frame[i];
 372                 frame->v4l2_buf.index = i;
 373                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 374                 frame->v4l2_buf.flags = 0;
 375                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 376                 frame->v4l2_buf.length = frsz;
 377                 frame->v4l2_buf.memory = gspca_dev->memory;
 378                 frame->v4l2_buf.sequence = 0;
 379                 frame->data = frame->data_end =
 380                                         gspca_dev->frbuf + i * frsz;
 381                 frame->v4l2_buf.m.offset = i * frsz;
 382         }
 383         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 384         gspca_dev->cur_frame = &gspca_dev->frame[0];
 385         gspca_dev->last_packet_type = DISCARD_PACKET;
 386         gspca_dev->sequence = 0;
 387         return 0;
 388 }
 389
 390 static void frame_free(struct gspca_dev *gspca_dev)
 391 {
 392         int i;
 393
 394         PDEBUG(D_STREAM, "frame free");
 395         if (gspca_dev->frbuf != NULL) {
 396                 rvfree(gspca_dev->frbuf,
 397                         gspca_dev->nframes * gspca_dev->frsz);
 398                 gspca_dev->frbuf = NULL;
 399                 for (i = 0; i < gspca_dev->nframes; i++)
 400                         gspca_dev->frame[i].data = NULL;
 401         }
 402         gspca_dev->nframes = 0;
 403 }
 404
 405 static void destroy_urbs(struct gspca_dev *gspca_dev)
 406 {
 407         struct urb *urb;
 408         unsigned int i;
 409
 410         PDEBUG(D_STREAM, "kill transfer");
 411         for (i = 0; i < MAX_NURBS; i++) {
 412                 urb = gspca_dev->urb[i];
 413                 if (urb == NULL)
 414                         break;
 415
 416                 gspca_dev->urb[i] = NULL;
 417                 usb_kill_urb(urb);
 418                 if (urb->transfer_buffer != NULL)
 419                         usb_buffer_free(gspca_dev->dev,
 420                                         urb->transfer_buffer_length,
 421                                         urb->transfer_buffer,
 422                                         urb->transfer_dma);
 423                 usb_free_urb(urb);
 424         }
 425 }
 426
 427 /*
 428  * look for an input transfer endpoint in an alternate setting
 429  */
 430 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 431                                           int xfer)
 432 {
 433         struct usb_host_endpoint *ep;
 434         int i, attr;
 435
 436         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 437                 ep = &alt->endpoint[i];
 438                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 439                 if (attr == xfer
 440                     && ep->desc.wMaxPacketSize != 0)
 441                         return ep;
 442         }
 443         return NULL;
 444 }
 445
 446 /*
 447  * look for an input (isoc or bulk) endpoint
 448  *
 449  * The endpoint is defined by the subdriver.
 450  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 451  * This routine may be called many times when the bandwidth is too small
 452  * (the bandwidth is checked on urb submit).
 453  */
 454 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 455 {
 456         struct usb_interface *intf;
 457         struct usb_host_endpoint *ep;
 458         int xfer, i, ret;
 459
 460         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 461         ep = NULL;
 462         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 463                                    : USB_ENDPOINT_XFER_ISOC;
 464         i = gspca_dev->alt;                     /* previous alt setting */
 465         if (gspca_dev->cam.reverse_alts) {
 466                 while (++i < gspca_dev->nbalt) {
 467                         ep = alt_xfer(&intf->altsetting[i], xfer);
 468                         if (ep)
 469                                 break;
 470                 }
 471         } else {
 472                 while (--i >= 0) {
 473                         ep = alt_xfer(&intf->altsetting[i], xfer);
 474                         if (ep)
 475                                 break;
 476                 }
 477         }
 478         if (ep == NULL) {
 479                 err("no transfer endpoint found");
 480                 return NULL;
 481         }
 482         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 483                         i, ep->desc.bEndpointAddress);
 484         gspca_dev->alt = i;             /* memorize the current alt setting */
 485         if (gspca_dev->nbalt > 1) {
 486                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 487                 if (ret < 0) {
 488                         err("set alt %d err %d", i, ret);
 489                         return NULL;
 490                 }
 491         }
 492         return ep;
 493 }
 494
 495 /*
 496  * create the URBs for image transfer
 497  */
 498 static int create_urbs(struct gspca_dev *gspca_dev,
 499                         struct usb_host_endpoint *ep)
 500 {
 501         struct urb *urb;
 502         int n, nurbs, i, psize, npkt, bsize;
 503
 504         /* calculate the packet size and the number of packets */
 505         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 506
 507         if (!gspca_dev->cam.bulk) {             /* isoc */
 508
 509                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 510                 if (gspca_dev->pkt_size == 0)
 511                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 512                 else
 513                         psize = gspca_dev->pkt_size;
 514                 npkt = gspca_dev->cam.npkt;
 515                 if (npkt == 0)
 516                         npkt = 32;              /* default value */
 517                 bsize = psize * npkt;
 518                 PDEBUG(D_STREAM,
 519                         "isoc %d pkts size %d = bsize:%d",
 520                         npkt, psize, bsize);
 521                 nurbs = DEF_NURBS;
 522         } else {                                /* bulk */
 523                 npkt = 0;
 524                 bsize = gspca_dev->cam.bulk_size;
 525                 if (bsize == 0)
 526                         bsize = psize;
 527                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 528                 if (gspca_dev->cam.bulk_nurbs != 0)
 529                         nurbs = gspca_dev->cam.bulk_nurbs;
 530                 else
 531                         nurbs = 1;
 532         }
 533
 534         for (n = 0; n < nurbs; n++) {
 535                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 536                 if (!urb) {
 537                         err("usb_alloc_urb failed");
 538                         return -ENOMEM;
 539                 }
 540                 gspca_dev->urb[n] = urb;
 541                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 542                                                 bsize,
 543                                                 GFP_KERNEL,
 544                                                 &urb->transfer_dma);
 545
 546                 if (urb->transfer_buffer == NULL) {
 547                         err("usb_buffer_alloc failed");
 548                         return -ENOMEM;
 549                 }
 550                 urb->dev = gspca_dev->dev;
 551                 urb->context = gspca_dev;
 552                 urb->transfer_buffer_length = bsize;
 553                 if (npkt != 0) {                /* ISOC */
 554                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 555                                                     ep->desc.bEndpointAddress);
 556                         urb->transfer_flags = URB_ISO_ASAP
 557                                         | URB_NO_TRANSFER_DMA_MAP;
 558                         urb->interval = ep->desc.bInterval;
 559                         urb->complete = isoc_irq;
 560                         urb->number_of_packets = npkt;
 561                         for (i = 0; i < npkt; i++) {
 562                                 urb->iso_frame_desc[i].length = psize;
 563                                 urb->iso_frame_desc[i].offset = psize * i;
 564                         }
 565                 } else {                /* bulk */
 566                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 567                                                 ep->desc.bEndpointAddress),
 568                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 569                         urb->complete = bulk_irq;
 570                 }
 571         }
 572         return 0;
 573 }
 574
 575 /*
 576  * start the USB transfer
 577  */
 578 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 579 {
 580         struct usb_host_endpoint *ep;
 581         struct urb *urb;
 582         int n, ret;
 583
 584         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 585                 return -ERESTARTSYS;
 586
 587         if (!gspca_dev->present) {
 588                 ret = -ENODEV;
 589                 goto out;
 590         }
 591
 592         /* set the higher alternate setting and
 593          * loop until urb submit succeeds */
 594         if (gspca_dev->cam.reverse_alts)
 595                 gspca_dev->alt = 0;
 596         else
 597                 gspca_dev->alt = gspca_dev->nbalt;
 598
 599         if (gspca_dev->sd_desc->isoc_init) {
 600                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 601                 if (ret < 0)
 602                         goto out;
 603         }
 604         ep = get_ep(gspca_dev);
 605         if (ep == NULL) {
 606                 ret = -EIO;
 607                 goto out;
 608         }
 609         for (;;) {
 610                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 611                 ret = create_urbs(gspca_dev, ep);
 612                 if (ret < 0) {
 613                         destroy_urbs(gspca_dev);
 614                         goto out;
 615                 }
 616
 617                 /* clear the bulk endpoint */
 618                 if (gspca_dev->cam.bulk)
 619                         usb_clear_halt(gspca_dev->dev,
 620                                         gspca_dev->urb[0]->pipe);
 621
 622                 /* start the cam */
 623                 ret = gspca_dev->sd_desc->start(gspca_dev);
 624                 if (ret < 0) {
 625                         destroy_urbs(gspca_dev);
 626                         goto out;
 627                 }
 628                 gspca_dev->streaming = 1;
 629
 630                 /* some bulk transfers are started by the subdriver */
 631                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 632                         break;
 633
 634                 /* submit the URBs */
 635                 for (n = 0; n < MAX_NURBS; n++) {
 636                         urb = gspca_dev->urb[n];
 637                         if (urb == NULL)
 638                                 break;
 639                         ret = usb_submit_urb(urb, GFP_KERNEL);
 640                         if (ret < 0)
 641                                 break;
 642                 }
 643                 if (ret >= 0)
 644                         break;
 645                 gspca_dev->streaming = 0;
 646                 destroy_urbs(gspca_dev);
 647                 if (ret != -ENOSPC) {
 648                         PDEBUG(D_ERR|D_STREAM,
 649                                 "usb_submit_urb alt %d err %d",
 650                                 gspca_dev->alt, ret);
 651                         goto out;
 652                 }
 653
 654                 /* the bandwidth is not wide enough
 655                  * negociate or try a lower alternate setting */
 656                 PDEBUG(D_ERR|D_STREAM,
 657                         "bandwidth not wide enough - trying again");
 658                 msleep(20);     /* wait for kill complete */
 659                 if (gspca_dev->sd_desc->isoc_nego) {
 660                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 661                         if (ret < 0)
 662                                 goto out;
 663                 } else {
 664                         ep = get_ep(gspca_dev);
 665                         if (ep == NULL) {
 666                                 ret = -EIO;
 667                                 goto out;
 668                         }
 669                 }
 670         }
 671 out:
 672         mutex_unlock(&gspca_dev->usb_lock);
 673         return ret;
 674 }
 675
 676 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 677 {
 678         int ret;
 679
 680         if (gspca_dev->alt == 0)
 681                 return 0;
 682         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 683         if (ret < 0)
 684                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 685         return ret;
 686 }
 687
 688 /* Note: both the queue and the usb locks should be held when calling this */
 689 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 690 {
 691         gspca_dev->streaming = 0;
 692         if (gspca_dev->present) {
 693                 if (gspca_dev->sd_desc->stopN)
 694                         gspca_dev->sd_desc->stopN(gspca_dev);
 695                 destroy_urbs(gspca_dev);
 696                 gspca_set_alt0(gspca_dev);
 697         }
 698
 699         /* always call stop0 to free the subdriver's resources */
 700         if (gspca_dev->sd_desc->stop0)
 701                 gspca_dev->sd_desc->stop0(gspca_dev);
 702         PDEBUG(D_STREAM, "stream off OK");
 703 }
 704
 705 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 706 {
 707         int i;
 708
 709         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 710         gspca_dev->curr_mode = i;
 711         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 712         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 713         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 714 }
 715
 716 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 717                         int width, int height)
 718 {
 719         int i;
 720
 721         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 722                 if (width >= gspca_dev->cam.cam_mode[i].width
 723                     && height >= gspca_dev->cam.cam_mode[i].height)
 724                         break;
 725         }
 726         return i;
 727 }
 728
 729 /*
 730  * search a mode with the right pixel format
 731  */
 732 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 733                         int mode,
 734                         int pixfmt)
 735 {
 736         int modeU, modeD;
 737
 738         modeU = modeD = mode;
 739         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 740                 if (--modeD >= 0) {
 741                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 742                                                                 == pixfmt)
 743                                 return modeD;
 744                 }
 745                 if (++modeU < gspca_dev->cam.nmodes) {
 746                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 747                                                                 == pixfmt)
 748                                 return modeU;
 749                 }
 750         }
 751         return -EINVAL;
 752 }
 753
 754 #ifdef CONFIG_VIDEO_ADV_DEBUG
 755 static int vidioc_g_register(struct file *file, void *priv,
 756                         struct v4l2_dbg_register *reg)
 757 {
 758         int ret;
 759         struct gspca_dev *gspca_dev = priv;
 760
 761         if (!gspca_dev->sd_desc->get_chip_ident)
 762                 return -EINVAL;
 763
 764         if (!gspca_dev->sd_desc->get_register)
 765                 return -EINVAL;
 766
 767         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 768                 return -ERESTARTSYS;
 769         gspca_dev->usb_err = 0;
 770         if (gspca_dev->present)
 771                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 772         else
 773                 ret = -ENODEV;
 774         mutex_unlock(&gspca_dev->usb_lock);
 775
 776         return ret;
 777 }
 778
 779 static int vidioc_s_register(struct file *file, void *priv,
 780                         struct v4l2_dbg_register *reg)
 781 {
 782         int ret;
 783         struct gspca_dev *gspca_dev = priv;
 784
 785         if (!gspca_dev->sd_desc->get_chip_ident)
 786                 return -EINVAL;
 787
 788         if (!gspca_dev->sd_desc->set_register)
 789                 return -EINVAL;
 790
 791         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 792                 return -ERESTARTSYS;
 793         gspca_dev->usb_err = 0;
 794         if (gspca_dev->present)
 795                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 796         else
 797                 ret = -ENODEV;
 798         mutex_unlock(&gspca_dev->usb_lock);
 799
 800         return ret;
 801 }
 802 #endif
 803
 804 static int vidioc_g_chip_ident(struct file *file, void *priv,
 805                         struct v4l2_dbg_chip_ident *chip)
 806 {
 807         int ret;
 808         struct gspca_dev *gspca_dev = priv;
 809
 810         if (!gspca_dev->sd_desc->get_chip_ident)
 811                 return -EINVAL;
 812
 813         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 814                 return -ERESTARTSYS;
 815         gspca_dev->usb_err = 0;
 816         if (gspca_dev->present)
 817                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 818         else
 819                 ret = -ENODEV;
 820         mutex_unlock(&gspca_dev->usb_lock);
 821
 822         return ret;
 823 }
 824
 825 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 826                                 struct v4l2_fmtdesc *fmtdesc)
 827 {
 828         struct gspca_dev *gspca_dev = priv;
 829         int i, j, index;
 830         __u32 fmt_tb[8];
 831
 832         /* give an index to each format */
 833         index = 0;
 834         j = 0;
 835         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 836                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 837                 j = 0;
 838                 for (;;) {
 839                         if (fmt_tb[j] == fmt_tb[index])
 840                                 break;
 841                         j++;
 842                 }
 843                 if (j == index) {
 844                         if (fmtdesc->index == index)
 845                                 break;          /* new format */
 846                         index++;
 847                         if (index >= ARRAY_SIZE(fmt_tb))
 848                                 return -EINVAL;
 849                 }
 850         }
 851         if (i < 0)
 852                 return -EINVAL;         /* no more format */
 853
 854         fmtdesc->pixelformat = fmt_tb[index];
 855         if (gspca_is_compressed(fmt_tb[index]))
 856                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 857         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 858         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 859         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 860         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 861         fmtdesc->description[4] = '\0';
 862         return 0;
 863 }
 864
 865 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 866                             struct v4l2_format *fmt)
 867 {
 868         struct gspca_dev *gspca_dev = priv;
 869         int mode;
 870
 871         mode = gspca_dev->curr_mode;
 872         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 873                 sizeof fmt->fmt.pix);
 874         return 0;
 875 }
 876
 877 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 878                         struct v4l2_format *fmt)
 879 {
 880         int w, h, mode, mode2;
 881
 882         w = fmt->fmt.pix.width;
 883         h = fmt->fmt.pix.height;
 884
 885 #ifdef GSPCA_DEBUG
 886         if (gspca_debug & D_CONF)
 887                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 888 #endif
 889         /* search the closest mode for width and height */
 890         mode = wxh_to_mode(gspca_dev, w, h);
 891
 892         /* OK if right palette */
 893         if (gspca_dev->cam.cam_mode[mode].pixelformat
 894                                                 != fmt->fmt.pix.pixelformat) {
 895
 896                 /* else, search the closest mode with the same pixel format */
 897                 mode2 = gspca_get_mode(gspca_dev, mode,
 898                                         fmt->fmt.pix.pixelformat);
 899                 if (mode2 >= 0)
 900                         mode = mode2;
 901 /*              else
 902                         ;                * no chance, return this mode */
 903         }
 904         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 905                 sizeof fmt->fmt.pix);
 906         return mode;                    /* used when s_fmt */
 907 }
 908
 909 static int vidioc_try_fmt_vid_cap(struct file *file,
 910                               void *priv,
 911                               struct v4l2_format *fmt)
 912 {
 913         struct gspca_dev *gspca_dev = priv;
 914         int ret;
 915
 916         ret = try_fmt_vid_cap(gspca_dev, fmt);
 917         if (ret < 0)
 918                 return ret;
 919         return 0;
 920 }
 921
 922 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 923                             struct v4l2_format *fmt)
 924 {
 925         struct gspca_dev *gspca_dev = priv;
 926         int ret;
 927
 928         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 929                 return -ERESTARTSYS;
 930
 931         ret = try_fmt_vid_cap(gspca_dev, fmt);
 932         if (ret < 0)
 933                 goto out;
 934
 935         if (gspca_dev->nframes != 0
 936             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 937                 ret = -EINVAL;
 938                 goto out;
 939         }
 940
 941         if (ret == gspca_dev->curr_mode) {
 942                 ret = 0;
 943                 goto out;                       /* same mode */
 944         }
 945
 946         if (gspca_dev->streaming) {
 947                 ret = -EBUSY;
 948                 goto out;
 949         }
 950         gspca_dev->width = fmt->fmt.pix.width;
 951         gspca_dev->height = fmt->fmt.pix.height;
 952         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 953         gspca_dev->curr_mode = ret;
 954
 955         ret = 0;
 956 out:
 957         mutex_unlock(&gspca_dev->queue_lock);
 958         return ret;
 959 }
 960
 961 static int vidioc_enum_framesizes(struct file *file, void *priv,
 962                                   struct v4l2_frmsizeenum *fsize)
 963 {
 964         struct gspca_dev *gspca_dev = priv;
 965         int i;
 966         __u32 index = 0;
 967
 968         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 969                 if (fsize->pixel_format !=
 970                                 gspca_dev->cam.cam_mode[i].pixelformat)
 971                         continue;
 972
 973                 if (fsize->index == index) {
 974                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 975                         fsize->discrete.width =
 976                                 gspca_dev->cam.cam_mode[i].width;
 977                         fsize->discrete.height =
 978                                 gspca_dev->cam.cam_mode[i].height;
 979                         return 0;
 980                 }
 981                 index++;
 982         }
 983
 984         return -EINVAL;
 985 }
 986
 987 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
 988                                       struct v4l2_frmivalenum *fival)
 989 {
 990         struct gspca_dev *gspca_dev = priv;
 991         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
 992         __u32 i;
 993
 994         if (gspca_dev->cam.mode_framerates == NULL ||
 995                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
 996                 return -EINVAL;
 997
 998         if (fival->pixel_format !=
 999                         gspca_dev->cam.cam_mode[mode].pixelformat)
1000                 return -EINVAL;
1001
1002         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1003                 if (fival->index == i) {
1004                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1005                         fival->discrete.numerator = 1;
1006                         fival->discrete.denominator =
1007                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1008                         return 0;
1009                 }
1010         }
1011
1012         return -EINVAL;
1013 }
1014
1015 static void gspca_release(struct video_device *vfd)
1016 {
1017         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1018
1019         PDEBUG(D_PROBE, "%s released",
1020                 video_device_node_name(&gspca_dev->vdev));
1021
1022         kfree(gspca_dev->usb_buf);
1023         kfree(gspca_dev);
1024 }
1025
1026 static int dev_open(struct file *file)
1027 {
1028         struct gspca_dev *gspca_dev;
1029         int ret;
1030
1031         PDEBUG(D_STREAM, "[%s] open", current->comm);
1032         gspca_dev = (struct gspca_dev *) video_devdata(file);
1033         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1034                 return -ERESTARTSYS;
1035         if (!gspca_dev->present) {
1036                 ret = -ENODEV;
1037                 goto out;
1038         }
1039
1040         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1041                 ret = -EBUSY;
1042                 goto out;
1043         }
1044
1045         /* protect the subdriver against rmmod */
1046         if (!try_module_get(gspca_dev->module)) {
1047                 ret = -ENODEV;
1048                 goto out;
1049         }
1050
1051         gspca_dev->users++;
1052
1053         file->private_data = gspca_dev;
1054 #ifdef GSPCA_DEBUG
1055         /* activate the v4l2 debug */
1056         if (gspca_debug & D_V4L2)
1057                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1058                                         | V4L2_DEBUG_IOCTL_ARG;
1059         else
1060                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1061                                         | V4L2_DEBUG_IOCTL_ARG);
1062 #endif
1063         ret = 0;
1064 out:
1065         mutex_unlock(&gspca_dev->queue_lock);
1066         if (ret != 0)
1067                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1068         else
1069                 PDEBUG(D_STREAM, "open done");
1070         return ret;
1071 }
1072
1073 static int dev_close(struct file *file)
1074 {
1075         struct gspca_dev *gspca_dev = file->private_data;
1076
1077         PDEBUG(D_STREAM, "[%s] close", current->comm);
1078         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1079                 return -ERESTARTSYS;
1080         gspca_dev->users--;
1081
1082         /* if the file did the capture, free the streaming resources */
1083         if (gspca_dev->capt_file == file) {
1084                 if (gspca_dev->streaming) {
1085                         mutex_lock(&gspca_dev->usb_lock);
1086                         gspca_dev->usb_err = 0;
1087                         gspca_stream_off(gspca_dev);
1088                         mutex_unlock(&gspca_dev->usb_lock);
1089                 }
1090                 frame_free(gspca_dev);
1091                 gspca_dev->capt_file = NULL;
1092                 gspca_dev->memory = GSPCA_MEMORY_NO;
1093         }
1094         file->private_data = NULL;
1095         module_put(gspca_dev->module);
1096         mutex_unlock(&gspca_dev->queue_lock);
1097
1098         PDEBUG(D_STREAM, "close done");
1099
1100         return 0;
1101 }
1102
1103 static int vidioc_querycap(struct file *file, void  *priv,
1104                            struct v4l2_capability *cap)
1105 {
1106         struct gspca_dev *gspca_dev = priv;
1107         int ret;
1108
1109         /* protect the access to the usb device */
1110         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1111                 return -ERESTARTSYS;
1112         if (!gspca_dev->present) {
1113                 ret = -ENODEV;
1114                 goto out;
1115         }
1116         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1117         if (gspca_dev->dev->product != NULL) {
1118                 strncpy(cap->card, gspca_dev->dev->product,
1119                         sizeof cap->card);
1120         } else {
1121                 snprintf(cap->card, sizeof cap->card,
1122                         "USB Camera (%04x:%04x)",
1123                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1124                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1125         }
1126         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1127         cap->version = DRIVER_VERSION_NUMBER;
1128         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1129                           | V4L2_CAP_STREAMING
1130                           | V4L2_CAP_READWRITE;
1131         ret = 0;
1132 out:
1133         mutex_unlock(&gspca_dev->usb_lock);
1134         return ret;
1135 }
1136
1137 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1138                                    int id)
1139 {
1140         const struct ctrl *ctrls;
1141         int i;
1142
1143         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1144              i < gspca_dev->sd_desc->nctrls;
1145              i++, ctrls++) {
1146                 if (gspca_dev->ctrl_dis & (1 << i))
1147                         continue;
1148                 if (id == ctrls->qctrl.id)
1149                         return ctrls;
1150         }
1151         return NULL;
1152 }
1153
1154 static int vidioc_queryctrl(struct file *file, void *priv,
1155                            struct v4l2_queryctrl *q_ctrl)
1156 {
1157         struct gspca_dev *gspca_dev = priv;
1158         const struct ctrl *ctrls;
1159         int i;
1160         u32 id;
1161
1162         ctrls = NULL;
1163         id = q_ctrl->id;
1164         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1165                 id &= V4L2_CTRL_ID_MASK;
1166                 id++;
1167                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1168                         if (gspca_dev->ctrl_dis & (1 << i))
1169                                 continue;
1170                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1171                                 continue;
1172                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1173                                             > ctrls->qctrl.id)
1174                                 continue;
1175                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1176                 }
1177                 if (ctrls == NULL)
1178                         return -EINVAL;
1179         } else {
1180                 ctrls = get_ctrl(gspca_dev, id);
1181                 if (ctrls == NULL)
1182                         return -EINVAL;
1183                 i = ctrls - gspca_dev->sd_desc->ctrls;
1184         }
1185         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1186         if (gspca_dev->ctrl_inac & (1 << i))
1187                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1188         return 0;
1189 }
1190
1191 static int vidioc_s_ctrl(struct file *file, void *priv,
1192                          struct v4l2_control *ctrl)
1193 {
1194         struct gspca_dev *gspca_dev = priv;
1195         const struct ctrl *ctrls;
1196         int ret;
1197
1198         ctrls = get_ctrl(gspca_dev, ctrl->id);
1199         if (ctrls == NULL)
1200                 return -EINVAL;
1201
1202         if (ctrl->value < ctrls->qctrl.minimum
1203             || ctrl->value > ctrls->qctrl.maximum)
1204                 return -ERANGE;
1205         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1206         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1207                 return -ERESTARTSYS;
1208         gspca_dev->usb_err = 0;
1209         if (gspca_dev->present)
1210                 ret = ctrls->set(gspca_dev, ctrl->value);
1211         else
1212                 ret = -ENODEV;
1213         mutex_unlock(&gspca_dev->usb_lock);
1214         return ret;
1215 }
1216
1217 static int vidioc_g_ctrl(struct file *file, void *priv,
1218                          struct v4l2_control *ctrl)
1219 {
1220         struct gspca_dev *gspca_dev = priv;
1221         const struct ctrl *ctrls;
1222         int ret;
1223
1224         ctrls = get_ctrl(gspca_dev, ctrl->id);
1225         if (ctrls == NULL)
1226                 return -EINVAL;
1227
1228         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1229                 return -ERESTARTSYS;
1230         gspca_dev->usb_err = 0;
1231         if (gspca_dev->present)
1232                 ret = ctrls->get(gspca_dev, &ctrl->value);
1233         else
1234                 ret = -ENODEV;
1235         mutex_unlock(&gspca_dev->usb_lock);
1236         return ret;
1237 }
1238
1239 /*fixme: have an audio flag in gspca_dev?*/
1240 static int vidioc_s_audio(struct file *file, void *priv,
1241                          struct v4l2_audio *audio)
1242 {
1243         if (audio->index != 0)
1244                 return -EINVAL;
1245         return 0;
1246 }
1247
1248 static int vidioc_g_audio(struct file *file, void *priv,
1249                          struct v4l2_audio *audio)
1250 {
1251         strcpy(audio->name, "Microphone");
1252         return 0;
1253 }
1254
1255 static int vidioc_enumaudio(struct file *file, void *priv,
1256                          struct v4l2_audio *audio)
1257 {
1258         if (audio->index != 0)
1259                 return -EINVAL;
1260
1261         strcpy(audio->name, "Microphone");
1262         audio->capability = 0;
1263         audio->mode = 0;
1264         return 0;
1265 }
1266
1267 static int vidioc_querymenu(struct file *file, void *priv,
1268                             struct v4l2_querymenu *qmenu)
1269 {
1270         struct gspca_dev *gspca_dev = priv;
1271
1272         if (!gspca_dev->sd_desc->querymenu)
1273                 return -EINVAL;
1274         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1275 }
1276
1277 static int vidioc_enum_input(struct file *file, void *priv,
1278                                 struct v4l2_input *input)
1279 {
1280         struct gspca_dev *gspca_dev = priv;
1281
1282         if (input->index != 0)
1283                 return -EINVAL;
1284         input->type = V4L2_INPUT_TYPE_CAMERA;
1285         input->status = gspca_dev->cam.input_flags;
1286         strncpy(input->name, gspca_dev->sd_desc->name,
1287                 sizeof input->name);
1288         return 0;
1289 }
1290
1291 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1292 {
1293         *i = 0;
1294         return 0;
1295 }
1296
1297 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1298 {
1299         if (i > 0)
1300                 return -EINVAL;
1301         return (0);
1302 }
1303
1304 static int vidioc_reqbufs(struct file *file, void *priv,
1305                           struct v4l2_requestbuffers *rb)
1306 {
1307         struct gspca_dev *gspca_dev = priv;
1308         int i, ret = 0;
1309
1310         switch (rb->memory) {
1311         case GSPCA_MEMORY_READ:                 /* (internal call) */
1312         case V4L2_MEMORY_MMAP:
1313         case V4L2_MEMORY_USERPTR:
1314                 break;
1315         default:
1316                 return -EINVAL;
1317         }
1318         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1319                 return -ERESTARTSYS;
1320
1321         if (gspca_dev->memory != GSPCA_MEMORY_NO
1322             && gspca_dev->memory != rb->memory) {
1323                 ret = -EBUSY;
1324                 goto out;
1325         }
1326
1327         /* only one file may do the capture */
1328         if (gspca_dev->capt_file != NULL
1329             && gspca_dev->capt_file != file) {
1330                 ret = -EBUSY;
1331                 goto out;
1332         }
1333
1334         /* if allocated, the buffers must not be mapped */
1335         for (i = 0; i < gspca_dev->nframes; i++) {
1336                 if (gspca_dev->frame[i].vma_use_count) {
1337                         ret = -EBUSY;
1338                         goto out;
1339                 }
1340         }
1341
1342         /* stop streaming */
1343         if (gspca_dev->streaming) {
1344                 mutex_lock(&gspca_dev->usb_lock);
1345                 gspca_dev->usb_err = 0;
1346                 gspca_stream_off(gspca_dev);
1347                 mutex_unlock(&gspca_dev->usb_lock);
1348         }
1349
1350         /* free the previous allocated buffers, if any */
1351         if (gspca_dev->nframes != 0) {
1352                 frame_free(gspca_dev);
1353                 gspca_dev->capt_file = NULL;
1354         }
1355         if (rb->count == 0)                     /* unrequest */
1356                 goto out;
1357         gspca_dev->memory = rb->memory;
1358         ret = frame_alloc(gspca_dev, rb->count);
1359         if (ret == 0) {
1360                 rb->count = gspca_dev->nframes;
1361                 gspca_dev->capt_file = file;
1362         }
1363 out:
1364         mutex_unlock(&gspca_dev->queue_lock);
1365         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1366         return ret;
1367 }
1368
1369 static int vidioc_querybuf(struct file *file, void *priv,
1370                            struct v4l2_buffer *v4l2_buf)
1371 {
1372         struct gspca_dev *gspca_dev = priv;
1373         struct gspca_frame *frame;
1374
1375         if (v4l2_buf->index < 0
1376             || v4l2_buf->index >= gspca_dev->nframes)
1377                 return -EINVAL;
1378
1379         frame = &gspca_dev->frame[v4l2_buf->index];
1380         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1381         return 0;
1382 }
1383
1384 static int vidioc_streamon(struct file *file, void *priv,
1385                            enum v4l2_buf_type buf_type)
1386 {
1387         struct gspca_dev *gspca_dev = priv;
1388         int ret;
1389
1390         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1391                 return -EINVAL;
1392         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1393                 return -ERESTARTSYS;
1394
1395         if (gspca_dev->nframes == 0
1396             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1397                 ret = -EINVAL;
1398                 goto out;
1399         }
1400         if (!gspca_dev->streaming) {
1401                 ret = gspca_init_transfer(gspca_dev);
1402                 if (ret < 0)
1403                         goto out;
1404         }
1405 #ifdef GSPCA_DEBUG
1406         if (gspca_debug & D_STREAM) {
1407                 PDEBUG_MODE("stream on OK",
1408                         gspca_dev->pixfmt,
1409                         gspca_dev->width,
1410                         gspca_dev->height);
1411         }
1412 #endif
1413         ret = 0;
1414 out:
1415         mutex_unlock(&gspca_dev->queue_lock);
1416         return ret;
1417 }
1418
1419 static int vidioc_streamoff(struct file *file, void *priv,
1420                                 enum v4l2_buf_type buf_type)
1421 {
1422         struct gspca_dev *gspca_dev = priv;
1423         int i, ret;
1424
1425         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1426                 return -EINVAL;
1427         if (!gspca_dev->streaming)
1428                 return 0;
1429         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1430                 return -ERESTARTSYS;
1431
1432         /* stop streaming */
1433         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1434                 ret = -ERESTARTSYS;
1435                 goto out;
1436         }
1437         gspca_dev->usb_err = 0;
1438         gspca_stream_off(gspca_dev);
1439         mutex_unlock(&gspca_dev->usb_lock);
1440
1441         /* empty the application queues */
1442         for (i = 0; i < gspca_dev->nframes; i++)
1443                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1444         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1445         gspca_dev->last_packet_type = DISCARD_PACKET;
1446         gspca_dev->sequence = 0;
1447         ret = 0;
1448 out:
1449         mutex_unlock(&gspca_dev->queue_lock);
1450         return ret;
1451 }
1452
1453 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1454                         struct v4l2_jpegcompression *jpegcomp)
1455 {
1456         struct gspca_dev *gspca_dev = priv;
1457         int ret;
1458
1459         if (!gspca_dev->sd_desc->get_jcomp)
1460                 return -EINVAL;
1461         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1462                 return -ERESTARTSYS;
1463         gspca_dev->usb_err = 0;
1464         if (gspca_dev->present)
1465                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1466         else
1467                 ret = -ENODEV;
1468         mutex_unlock(&gspca_dev->usb_lock);
1469         return ret;
1470 }
1471
1472 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1473                         struct v4l2_jpegcompression *jpegcomp)
1474 {
1475         struct gspca_dev *gspca_dev = priv;
1476         int ret;
1477
1478         if (!gspca_dev->sd_desc->set_jcomp)
1479                 return -EINVAL;
1480         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1481                 return -ERESTARTSYS;
1482         gspca_dev->usb_err = 0;
1483         if (gspca_dev->present)
1484                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1485         else
1486                 ret = -ENODEV;
1487         mutex_unlock(&gspca_dev->usb_lock);
1488         return ret;
1489 }
1490
1491 static int vidioc_g_parm(struct file *filp, void *priv,
1492                         struct v4l2_streamparm *parm)
1493 {
1494         struct gspca_dev *gspca_dev = priv;
1495
1496         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1497
1498         if (gspca_dev->sd_desc->get_streamparm) {
1499                 int ret;
1500
1501                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1502                         return -ERESTARTSYS;
1503                 gspca_dev->usb_err = 0;
1504                 if (gspca_dev->present)
1505                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1506                                                                  parm);
1507                 else
1508                         ret = -ENODEV;
1509                 mutex_unlock(&gspca_dev->usb_lock);
1510                 return ret;
1511         }
1512
1513         return 0;
1514 }
1515
1516 static int vidioc_s_parm(struct file *filp, void *priv,
1517                         struct v4l2_streamparm *parm)
1518 {
1519         struct gspca_dev *gspca_dev = priv;
1520         int n;
1521
1522         n = parm->parm.capture.readbuffers;
1523         if (n == 0 || n > GSPCA_MAX_FRAMES)
1524                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1525         else
1526                 gspca_dev->nbufread = n;
1527
1528         if (gspca_dev->sd_desc->set_streamparm) {
1529                 int ret;
1530
1531                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1532                         return -ERESTARTSYS;
1533                 gspca_dev->usb_err = 0;
1534                 if (gspca_dev->present)
1535                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1536                                                                  parm);
1537                 else
1538                         ret = -ENODEV;
1539                 mutex_unlock(&gspca_dev->usb_lock);
1540                 return ret;
1541         }
1542
1543         return 0;
1544 }
1545
1546 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1547 static int vidiocgmbuf(struct file *file, void *priv,
1548                         struct video_mbuf *mbuf)
1549 {
1550         struct gspca_dev *gspca_dev = file->private_data;
1551         int i;
1552
1553         PDEBUG(D_STREAM, "cgmbuf");
1554         if (gspca_dev->nframes == 0) {
1555                 int ret;
1556
1557                 {
1558                         struct v4l2_format fmt;
1559
1560                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1561                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1562                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1563                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1564                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1565                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1566                         if (ret != 0)
1567                                 return ret;
1568                 }
1569                 {
1570                         struct v4l2_requestbuffers rb;
1571
1572                         memset(&rb, 0, sizeof rb);
1573                         rb.count = 4;
1574                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1575                         rb.memory = V4L2_MEMORY_MMAP;
1576                         ret = vidioc_reqbufs(file, priv, &rb);
1577                         if (ret != 0)
1578                                 return ret;
1579                 }
1580         }
1581         mbuf->frames = gspca_dev->nframes;
1582         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1583         for (i = 0; i < mbuf->frames; i++)
1584                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1585         return 0;
1586 }
1587 #endif
1588
1589 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1590 {
1591         struct gspca_dev *gspca_dev = file->private_data;
1592         struct gspca_frame *frame;
1593         struct page *page;
1594         unsigned long addr, start, size;
1595         int i, ret;
1596
1597         start = vma->vm_start;
1598         size = vma->vm_end - vma->vm_start;
1599         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1600
1601         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1602                 return -ERESTARTSYS;
1603         if (!gspca_dev->present) {
1604                 ret = -ENODEV;
1605                 goto out;
1606         }
1607         if (gspca_dev->capt_file != file) {
1608                 ret = -EINVAL;
1609                 goto out;
1610         }
1611
1612         frame = NULL;
1613         for (i = 0; i < gspca_dev->nframes; ++i) {
1614                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1615                         PDEBUG(D_STREAM, "mmap bad memory type");
1616                         break;
1617                 }
1618                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1619                                                 == vma->vm_pgoff) {
1620                         frame = &gspca_dev->frame[i];
1621                         break;
1622                 }
1623         }
1624         if (frame == NULL) {
1625                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1626                 ret = -EINVAL;
1627                 goto out;
1628         }
1629 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1630         /* v4l1 maps all the buffers */
1631         if (i != 0
1632             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1633 #endif
1634             if (size != frame->v4l2_buf.length) {
1635                 PDEBUG(D_STREAM, "mmap bad size");
1636                 ret = -EINVAL;
1637                 goto out;
1638         }
1639
1640         /*
1641          * - VM_IO marks the area as being a mmaped region for I/O to a
1642          *   device. It also prevents the region from being core dumped.
1643          */
1644         vma->vm_flags |= VM_IO;
1645
1646         addr = (unsigned long) frame->data;
1647         while (size > 0) {
1648                 page = vmalloc_to_page((void *) addr);
1649                 ret = vm_insert_page(vma, start, page);
1650                 if (ret < 0)
1651                         goto out;
1652                 start += PAGE_SIZE;
1653                 addr += PAGE_SIZE;
1654                 size -= PAGE_SIZE;
1655         }
1656
1657         vma->vm_ops = &gspca_vm_ops;
1658         vma->vm_private_data = frame;
1659         gspca_vm_open(vma);
1660         ret = 0;
1661 out:
1662         mutex_unlock(&gspca_dev->queue_lock);
1663         return ret;
1664 }
1665
1666 /*
1667  * wait for a video frame
1668  *
1669  * If a frame is ready, its index is returned.
1670  */
1671 static int frame_wait(struct gspca_dev *gspca_dev,
1672                         int nonblock_ing)
1673 {
1674         struct gspca_frame *frame;
1675         int i, j, ret;
1676
1677         /* check if a frame is ready */
1678         i = gspca_dev->fr_o;
1679         j = gspca_dev->fr_queue[i];
1680         frame = &gspca_dev->frame[j];
1681
1682         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1683                 if (nonblock_ing)
1684                         return -EAGAIN;
1685
1686                 /* wait till a frame is ready */
1687                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1688                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1689                         !gspca_dev->streaming || !gspca_dev->present,
1690                         msecs_to_jiffies(3000));
1691                 if (ret < 0)
1692                         return ret;
1693                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1694                         return -EIO;
1695         }
1696
1697         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1698         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1699                 gspca_dev->fr_q,
1700                 gspca_dev->fr_i,
1701                 gspca_dev->fr_o);
1702
1703         if (gspca_dev->sd_desc->dq_callback) {
1704                 mutex_lock(&gspca_dev->usb_lock);
1705                 gspca_dev->usb_err = 0;
1706                 if (gspca_dev->present)
1707                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1708                 mutex_unlock(&gspca_dev->usb_lock);
1709         }
1710         return j;
1711 }
1712
1713 /*
1714  * dequeue a video buffer
1715  *
1716  * If nonblock_ing is false, block until a buffer is available.
1717  */
1718 static int vidioc_dqbuf(struct file *file, void *priv,
1719                         struct v4l2_buffer *v4l2_buf)
1720 {
1721         struct gspca_dev *gspca_dev = priv;
1722         struct gspca_frame *frame;
1723         int i, ret;
1724
1725         PDEBUG(D_FRAM, "dqbuf");
1726         if (v4l2_buf->memory != gspca_dev->memory)
1727                 return -EINVAL;
1728
1729         if (!gspca_dev->present)
1730                 return -ENODEV;
1731
1732         /* if not streaming, be sure the application will not loop forever */
1733         if (!(file->f_flags & O_NONBLOCK)
1734             && !gspca_dev->streaming && gspca_dev->users == 1)
1735                 return -EINVAL;
1736
1737         /* only the capturing file may dequeue */
1738         if (gspca_dev->capt_file != file)
1739                 return -EINVAL;
1740
1741         /* only one dequeue / read at a time */
1742         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1743                 return -ERESTARTSYS;
1744
1745         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1746         if (ret < 0)
1747                 goto out;
1748         i = ret;                                /* frame index */
1749         frame = &gspca_dev->frame[i];
1750         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1751                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1752                                  frame->data,
1753                                  frame->v4l2_buf.bytesused)) {
1754                         PDEBUG(D_ERR|D_STREAM,
1755                                 "dqbuf cp to user failed");
1756                         ret = -EFAULT;
1757                         goto out;
1758                 }
1759         }
1760         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1761         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1762         PDEBUG(D_FRAM, "dqbuf %d", i);
1763         ret = 0;
1764 out:
1765         mutex_unlock(&gspca_dev->read_lock);
1766         return ret;
1767 }
1768
1769 /*
1770  * queue a video buffer
1771  *
1772  * Attempting to queue a buffer that has already been
1773  * queued will return -EINVAL.
1774  */
1775 static int vidioc_qbuf(struct file *file, void *priv,
1776                         struct v4l2_buffer *v4l2_buf)
1777 {
1778         struct gspca_dev *gspca_dev = priv;
1779         struct gspca_frame *frame;
1780         int i, index, ret;
1781
1782         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1783
1784         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1785                 return -ERESTARTSYS;
1786
1787         index = v4l2_buf->index;
1788         if ((unsigned) index >= gspca_dev->nframes) {
1789                 PDEBUG(D_FRAM,
1790                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1791                 ret = -EINVAL;
1792                 goto out;
1793         }
1794         if (v4l2_buf->memory != gspca_dev->memory) {
1795                 PDEBUG(D_FRAM, "qbuf bad memory type");
1796                 ret = -EINVAL;
1797                 goto out;
1798         }
1799
1800         frame = &gspca_dev->frame[index];
1801         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1802                 PDEBUG(D_FRAM, "qbuf bad state");
1803                 ret = -EINVAL;
1804                 goto out;
1805         }
1806
1807         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1808
1809         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1810                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1811                 frame->v4l2_buf.length = v4l2_buf->length;
1812         }
1813
1814         /* put the buffer in the 'queued' queue */
1815         i = gspca_dev->fr_q;
1816         gspca_dev->fr_queue[i] = index;
1817         if (gspca_dev->fr_i == i)
1818                 gspca_dev->cur_frame = frame;
1819         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1820         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1821                 gspca_dev->fr_q,
1822                 gspca_dev->fr_i,
1823                 gspca_dev->fr_o);
1824
1825         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1826         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1827         ret = 0;
1828 out:
1829         mutex_unlock(&gspca_dev->queue_lock);
1830         return ret;
1831 }
1832
1833 /*
1834  * allocate the resources for read()
1835  */
1836 static int read_alloc(struct gspca_dev *gspca_dev,
1837                         struct file *file)
1838 {
1839         struct v4l2_buffer v4l2_buf;
1840         int i, ret;
1841
1842         PDEBUG(D_STREAM, "read alloc");
1843         if (gspca_dev->nframes == 0) {
1844                 struct v4l2_requestbuffers rb;
1845
1846                 memset(&rb, 0, sizeof rb);
1847                 rb.count = gspca_dev->nbufread;
1848                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1849                 rb.memory = GSPCA_MEMORY_READ;
1850                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1851                 if (ret != 0) {
1852                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1853                         return ret;
1854                 }
1855                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1856                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1857                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1858                 for (i = 0; i < gspca_dev->nbufread; i++) {
1859                         v4l2_buf.index = i;
1860                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1861                         if (ret != 0) {
1862                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1863                                 return ret;
1864                         }
1865                 }
1866                 gspca_dev->memory = GSPCA_MEMORY_READ;
1867         }
1868
1869         /* start streaming */
1870         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1871         if (ret != 0)
1872                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1873         return ret;
1874 }
1875
1876 static unsigned int dev_poll(struct file *file, poll_table *wait)
1877 {
1878         struct gspca_dev *gspca_dev = file->private_data;
1879         int i, ret;
1880
1881         PDEBUG(D_FRAM, "poll");
1882
1883         poll_wait(file, &gspca_dev->wq, wait);
1884
1885         /* if reqbufs is not done, the user would use read() */
1886         if (gspca_dev->nframes == 0) {
1887                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1888                         return POLLERR;         /* not the 1st time */
1889                 ret = read_alloc(gspca_dev, file);
1890                 if (ret != 0)
1891                         return POLLERR;
1892         }
1893
1894         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1895                 return POLLERR;
1896
1897         /* check the next incoming buffer */
1898         i = gspca_dev->fr_o;
1899         i = gspca_dev->fr_queue[i];
1900         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1901                 ret = POLLIN | POLLRDNORM;      /* something to read */
1902         else
1903                 ret = 0;
1904         mutex_unlock(&gspca_dev->queue_lock);
1905         if (!gspca_dev->present)
1906                 return POLLHUP;
1907         return ret;
1908 }
1909
1910 static ssize_t dev_read(struct file *file, char __user *data,
1911                     size_t count, loff_t *ppos)
1912 {
1913         struct gspca_dev *gspca_dev = file->private_data;
1914         struct gspca_frame *frame;
1915         struct v4l2_buffer v4l2_buf;
1916         struct timeval timestamp;
1917         int n, ret, ret2;
1918
1919         PDEBUG(D_FRAM, "read (%zd)", count);
1920         if (!gspca_dev->present)
1921                 return -ENODEV;
1922         switch (gspca_dev->memory) {
1923         case GSPCA_MEMORY_NO:                   /* first time */
1924                 ret = read_alloc(gspca_dev, file);
1925                 if (ret != 0)
1926                         return ret;
1927                 break;
1928         case GSPCA_MEMORY_READ:
1929                 if (gspca_dev->capt_file == file)
1930                         break;
1931                 /* fall thru */
1932         default:
1933                 return -EINVAL;
1934         }
1935
1936         /* get a frame */
1937         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1938         timestamp.tv_sec--;
1939         n = 2;
1940         for (;;) {
1941                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1942                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1943                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1944                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1945                 if (ret != 0) {
1946                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1947                         return ret;
1948                 }
1949
1950                 /* if the process slept for more than 1 second,
1951                  * get a newer frame */
1952                 frame = &gspca_dev->frame[v4l2_buf.index];
1953                 if (--n < 0)
1954                         break;                  /* avoid infinite loop */
1955                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1956                         break;
1957                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1958                 if (ret != 0) {
1959                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1960                         return ret;
1961                 }
1962         }
1963
1964         /* copy the frame */
1965         if (count > frame->v4l2_buf.bytesused)
1966                 count = frame->v4l2_buf.bytesused;
1967         ret = copy_to_user(data, frame->data, count);
1968         if (ret != 0) {
1969                 PDEBUG(D_ERR|D_STREAM,
1970                         "read cp to user lack %d / %zd", ret, count);
1971                 ret = -EFAULT;
1972                 goto out;
1973         }
1974         ret = count;
1975 out:
1976         /* in each case, requeue the buffer */
1977         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1978         if (ret2 != 0)
1979                 return ret2;
1980         return ret;
1981 }
1982
1983 static struct v4l2_file_operations dev_fops = {
1984         .owner = THIS_MODULE,
1985         .open = dev_open,
1986         .release = dev_close,
1987         .read = dev_read,
1988         .mmap = dev_mmap,
1989         .unlocked_ioctl = video_ioctl2,
1990         .poll   = dev_poll,
1991 };
1992
1993 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1994         .vidioc_querycap        = vidioc_querycap,
1995         .vidioc_dqbuf           = vidioc_dqbuf,
1996         .vidioc_qbuf            = vidioc_qbuf,
1997         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1998         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1999         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2000         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2001         .vidioc_streamon        = vidioc_streamon,
2002         .vidioc_queryctrl       = vidioc_queryctrl,
2003         .vidioc_g_ctrl          = vidioc_g_ctrl,
2004         .vidioc_s_ctrl          = vidioc_s_ctrl,
2005         .vidioc_g_audio         = vidioc_g_audio,
2006         .vidioc_s_audio         = vidioc_s_audio,
2007         .vidioc_enumaudio       = vidioc_enumaudio,
2008         .vidioc_querymenu       = vidioc_querymenu,
2009         .vidioc_enum_input      = vidioc_enum_input,
2010         .vidioc_g_input         = vidioc_g_input,
2011         .vidioc_s_input         = vidioc_s_input,
2012         .vidioc_reqbufs         = vidioc_reqbufs,
2013         .vidioc_querybuf        = vidioc_querybuf,
2014         .vidioc_streamoff       = vidioc_streamoff,
2015         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2016         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2017         .vidioc_g_parm          = vidioc_g_parm,
2018         .vidioc_s_parm          = vidioc_s_parm,
2019         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2020         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2021 #ifdef CONFIG_VIDEO_ADV_DEBUG
2022         .vidioc_g_register      = vidioc_g_register,
2023         .vidioc_s_register      = vidioc_s_register,
2024 #endif
2025         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2026 #ifdef CONFIG_VIDEO_V4L1_COMPAT
2027         .vidiocgmbuf          = vidiocgmbuf,
2028 #endif
2029 };
2030
2031 static struct video_device gspca_template = {
2032         .name = "gspca main driver",
2033         .fops = &dev_fops,
2034         .ioctl_ops = &dev_ioctl_ops,
2035         .release = gspca_release,
2036 };
2037
2038 /*
2039  * probe and create a new gspca device
2040  *
2041  * This function must be called by the sub-driver when it is
2042  * called for probing a new device.
2043  */
2044 int gspca_dev_probe(struct usb_interface *intf,
2045                 const struct usb_device_id *id,
2046                 const struct sd_desc *sd_desc,
2047                 int dev_size,
2048                 struct module *module)
2049 {
2050         struct usb_interface_descriptor *interface;
2051         struct gspca_dev *gspca_dev;
2052         struct usb_device *dev = interface_to_usbdev(intf);
2053         int ret;
2054
2055         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2056
2057         /* we don't handle multi-config cameras */
2058         if (dev->descriptor.bNumConfigurations != 1) {
2059                 PDEBUG(D_ERR, "Too many config");
2060                 return -ENODEV;
2061         }
2062         interface = &intf->cur_altsetting->desc;
2063         if (interface->bInterfaceNumber > 0) {
2064                 PDEBUG(D_ERR, "intf != 0");
2065                 return -ENODEV;
2066         }
2067
2068         /* create the device */
2069         if (dev_size < sizeof *gspca_dev)
2070                 dev_size = sizeof *gspca_dev;
2071         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2072         if (!gspca_dev) {
2073                 err("couldn't kzalloc gspca struct");
2074                 return -ENOMEM;
2075         }
2076         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2077         if (!gspca_dev->usb_buf) {
2078                 err("out of memory");
2079                 ret = -ENOMEM;
2080                 goto out;
2081         }
2082         gspca_dev->dev = dev;
2083         gspca_dev->iface = interface->bInterfaceNumber;
2084         gspca_dev->nbalt = intf->num_altsetting;
2085         gspca_dev->sd_desc = sd_desc;
2086         gspca_dev->nbufread = 2;
2087         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2088
2089         /* configure the subdriver and initialize the USB device */
2090         ret = sd_desc->config(gspca_dev, id);
2091         if (ret < 0)
2092                 goto out;
2093         ret = sd_desc->init(gspca_dev);
2094         if (ret < 0)
2095                 goto out;
2096         gspca_set_default_mode(gspca_dev);
2097
2098         mutex_init(&gspca_dev->usb_lock);
2099         mutex_init(&gspca_dev->read_lock);
2100         mutex_init(&gspca_dev->queue_lock);
2101         init_waitqueue_head(&gspca_dev->wq);
2102
2103         /* init video stuff */
2104         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2105         gspca_dev->vdev.parent = &intf->dev;
2106         gspca_dev->module = module;
2107         gspca_dev->present = 1;
2108         ret = video_register_device(&gspca_dev->vdev,
2109                                   VFL_TYPE_GRABBER,
2110                                   -1);
2111         if (ret < 0) {
2112                 err("video_register_device err %d", ret);
2113                 goto out;
2114         }
2115
2116         usb_set_intfdata(intf, gspca_dev);
2117         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2118         return 0;
2119 out:
2120         kfree(gspca_dev->usb_buf);
2121         kfree(gspca_dev);
2122         return ret;
2123 }
2124 EXPORT_SYMBOL(gspca_dev_probe);
2125
2126 /*
2127  * USB disconnection
2128  *
2129  * This function must be called by the sub-driver
2130  * when the device disconnects, after the specific resources are freed.
2131  */
2132 void gspca_disconnect(struct usb_interface *intf)
2133 {
2134         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2135
2136         PDEBUG(D_PROBE, "%s disconnect",
2137                 video_device_node_name(&gspca_dev->vdev));
2138         mutex_lock(&gspca_dev->usb_lock);
2139         gspca_dev->present = 0;
2140
2141         if (gspca_dev->streaming) {
2142                 destroy_urbs(gspca_dev);
2143                 wake_up_interruptible(&gspca_dev->wq);
2144         }
2145
2146         /* the device is freed at exit of this function */
2147         gspca_dev->dev = NULL;
2148         mutex_unlock(&gspca_dev->usb_lock);
2149
2150         usb_set_intfdata(intf, NULL);
2151
2152         /* release the device */
2153         /* (this will call gspca_release() immediatly or on last close) */
2154         video_unregister_device(&gspca_dev->vdev);
2155
2156 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2157 }
2158 EXPORT_SYMBOL(gspca_disconnect);
2159
2160 #ifdef CONFIG_PM
2161 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2162 {
2163         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2164
2165         if (!gspca_dev->streaming)
2166                 return 0;
2167         gspca_dev->frozen = 1;          /* avoid urb error messages */
2168         if (gspca_dev->sd_desc->stopN)
2169                 gspca_dev->sd_desc->stopN(gspca_dev);
2170         destroy_urbs(gspca_dev);
2171         gspca_set_alt0(gspca_dev);
2172         if (gspca_dev->sd_desc->stop0)
2173                 gspca_dev->sd_desc->stop0(gspca_dev);
2174         return 0;
2175 }
2176 EXPORT_SYMBOL(gspca_suspend);
2177
2178 int gspca_resume(struct usb_interface *intf)
2179 {
2180         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2181
2182         gspca_dev->frozen = 0;
2183         gspca_dev->sd_desc->init(gspca_dev);
2184         if (gspca_dev->streaming)
2185                 return gspca_init_transfer(gspca_dev);
2186         return 0;
2187 }
2188 EXPORT_SYMBOL(gspca_resume);
2189 #endif
2190 /* -- cam driver utility functions -- */
2191
2192 /* auto gain and exposure algorithm based on the knee algorithm described here:
2193    http://ytse.tricolour.net/docs/LowLightOptimization.html
2194
2195    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2196    where changed. */
2197 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2198         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2199 {
2200         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2201         const struct ctrl *gain_ctrl = NULL;
2202         const struct ctrl *exposure_ctrl = NULL;
2203         const struct ctrl *autogain_ctrl = NULL;
2204         int retval = 0;
2205
2206         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2207                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2208                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2209                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2210                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2211                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2212                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2213         }
2214         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2215                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2216                         "on cam without (auto)gain/exposure");
2217                 return 0;
2218         }
2219
2220         if (gain_ctrl->get(gspca_dev, &gain) ||
2221                         exposure_ctrl->get(gspca_dev, &exposure) ||
2222                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2223                 return 0;
2224
2225         orig_gain = gain;
2226         orig_exposure = exposure;
2227
2228         /* If we are of a multiple of deadzone, do multiple steps to reach the
2229            desired lumination fast (with the risc of a slight overshoot) */
2230         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2231
2232         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2233                 avg_lum, desired_avg_lum, steps);
2234
2235         for (i = 0; i < steps; i++) {
2236                 if (avg_lum > desired_avg_lum) {
2237                         if (gain > gain_knee)
2238                                 gain--;
2239                         else if (exposure > exposure_knee)
2240                                 exposure--;
2241                         else if (gain > gain_ctrl->qctrl.default_value)
2242                                 gain--;
2243                         else if (exposure > exposure_ctrl->qctrl.minimum)
2244                                 exposure--;
2245                         else if (gain > gain_ctrl->qctrl.minimum)
2246                                 gain--;
2247                         else
2248                                 break;
2249                 } else {
2250                         if (gain < gain_ctrl->qctrl.default_value)
2251                                 gain++;
2252                         else if (exposure < exposure_knee)
2253                                 exposure++;
2254                         else if (gain < gain_knee)
2255                                 gain++;
2256                         else if (exposure < exposure_ctrl->qctrl.maximum)
2257                                 exposure++;
2258                         else if (gain < gain_ctrl->qctrl.maximum)
2259                                 gain++;
2260                         else
2261                                 break;
2262                 }
2263         }
2264
2265         if (gain != orig_gain) {
2266                 gain_ctrl->set(gspca_dev, gain);
2267                 retval = 1;
2268         }
2269         if (exposure != orig_exposure) {
2270                 exposure_ctrl->set(gspca_dev, exposure);
2271                 retval = 1;
2272         }
2273
2274         return retval;
2275 }
2276 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2277
2278 /* -- module insert / remove -- */
2279 static int __init gspca_init(void)
2280 {
2281         info("main v%d.%d.%d registered",
2282                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2283                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2284                 DRIVER_VERSION_NUMBER & 0xff);
2285         return 0;
2286 }
2287 static void __exit gspca_exit(void)
2288 {
2289         info("main deregistered");
2290 }
2291
2292 module_init(gspca_init);
2293 module_exit(gspca_exit);
2294
2295 #ifdef GSPCA_DEBUG
2296 module_param_named(debug, gspca_debug, int, 0644);
2297 MODULE_PARM_DESC(debug,
2298                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2299                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2300                 " 0x0100: v4l2");
2301 #endif