drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/fs.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/io.h>
  32 #include <asm/page.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/jiffies.h>
  35 #include <media/v4l2-ioctl.h>
  36
  37 #include "gspca.h"
  38
  39 /* global values */
  40 #define DEF_NURBS 2             /* default number of URBs */
  41
  42 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  43 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  44 MODULE_LICENSE("GPL");
  45
  46 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 3, 0)
  47
  48 static int video_nr = -1;
  49
  50 #ifdef GSPCA_DEBUG
  51 int gspca_debug = D_ERR | D_PROBE;
  52 EXPORT_SYMBOL(gspca_debug);
  53
  54 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  55 {
  56         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  57                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  58                         txt,
  59                         pixfmt & 0xff,
  60                         (pixfmt >> 8) & 0xff,
  61                         (pixfmt >> 16) & 0xff,
  62                         pixfmt >> 24,
  63                         w, h);
  64         } else {
  65                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  66                         txt,
  67                         pixfmt,
  68                         w, h);
  69         }
  70 }
  71 #else
  72 #define PDEBUG_MODE(txt, pixfmt, w, h)
  73 #endif
  74
  75 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  76 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  77 #define GSPCA_MEMORY_READ 7
  78
  79 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  80
  81 /*
  82  * VMA operations.
  83  */
  84 static void gspca_vm_open(struct vm_area_struct *vma)
  85 {
  86         struct gspca_frame *frame = vma->vm_private_data;
  87
  88         frame->vma_use_count++;
  89         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  90 }
  91
  92 static void gspca_vm_close(struct vm_area_struct *vma)
  93 {
  94         struct gspca_frame *frame = vma->vm_private_data;
  95
  96         if (--frame->vma_use_count <= 0)
  97                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  98 }
  99
 100 static struct vm_operations_struct gspca_vm_ops = {
 101         .open           = gspca_vm_open,
 102         .close          = gspca_vm_close,
 103 };
 104
 105 /* get the current input frame buffer */
 106 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 107 {
 108         struct gspca_frame *frame;
 109         int i;
 110
 111         i = gspca_dev->fr_i;
 112         i = gspca_dev->fr_queue[i];
 113         frame = &gspca_dev->frame[i];
 114         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 115                                 != V4L2_BUF_FLAG_QUEUED)
 116                 return NULL;
 117         return frame;
 118 }
 119 EXPORT_SYMBOL(gspca_get_i_frame);
 120
 121 /*
 122  * fill a video frame from an URB and resubmit
 123  */
 124 static void fill_frame(struct gspca_dev *gspca_dev,
 125                         struct urb *urb)
 126 {
 127         struct gspca_frame *frame;
 128         __u8 *data;             /* address of data in the iso message */
 129         int i, len, st;
 130         cam_pkt_op pkt_scan;
 131
 132         if (urb->status != 0) {
 133 #ifdef CONFIG_PM
 134                 if (!gspca_dev->frozen)
 135 #endif
 136                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 137                 return;         /* disconnection ? */
 138         }
 139         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 140         for (i = 0; i < urb->number_of_packets; i++) {
 141
 142                 /* check the availability of the frame buffer */
 143                 frame = gspca_get_i_frame(gspca_dev);
 144                 if (!frame) {
 145                         gspca_dev->last_packet_type = DISCARD_PACKET;
 146                         break;
 147                 }
 148
 149                 /* check the packet status and length */
 150                 len = urb->iso_frame_desc[i].actual_length;
 151                 if (len == 0)
 152                         continue;
 153                 st = urb->iso_frame_desc[i].status;
 154                 if (st) {
 155                         PDEBUG(D_ERR,
 156                                 "ISOC data error: [%d] len=%d, status=%d",
 157                                 i, len, st);
 158                         gspca_dev->last_packet_type = DISCARD_PACKET;
 159                         continue;
 160                 }
 161
 162                 /* let the packet be analyzed by the subdriver */
 163                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 164                         i, urb->iso_frame_desc[i].offset, len);
 165                 data = (__u8 *) urb->transfer_buffer
 166                                         + urb->iso_frame_desc[i].offset;
 167                 pkt_scan(gspca_dev, frame, data, len);
 168         }
 169
 170         /* resubmit the URB */
 171         urb->status = 0;
 172         st = usb_submit_urb(urb, GFP_ATOMIC);
 173         if (st < 0)
 174                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 175 }
 176
 177 /*
 178  * ISOC message interrupt from the USB device
 179  *
 180  * Analyse each packet and call the subdriver for copy to the frame buffer.
 181  */
 182 static void isoc_irq(struct urb *urb
 183 )
 184 {
 185         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 186
 187         PDEBUG(D_PACK, "isoc irq");
 188         if (!gspca_dev->streaming)
 189                 return;
 190         fill_frame(gspca_dev, urb);
 191 }
 192
 193 /*
 194  * bulk message interrupt from the USB device
 195  */
 196 static void bulk_irq(struct urb *urb
 197 )
 198 {
 199         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 200         struct gspca_frame *frame;
 201
 202         PDEBUG(D_PACK, "bulk irq");
 203         if (!gspca_dev->streaming)
 204                 return;
 205         if (urb->status != 0 && urb->status != -ECONNRESET) {
 206 #ifdef CONFIG_PM
 207                 if (!gspca_dev->frozen)
 208 #endif
 209                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 210                 return;         /* disconnection ? */
 211         }
 212
 213         /* check the availability of the frame buffer */
 214         frame = gspca_get_i_frame(gspca_dev);
 215         if (!frame) {
 216                 gspca_dev->last_packet_type = DISCARD_PACKET;
 217         } else {
 218                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 219                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 220                                         frame,
 221                                         urb->transfer_buffer,
 222                                         urb->actual_length);
 223         }
 224 }
 225
 226 /*
 227  * add data to the current frame
 228  *
 229  * This function is called by the subdrivers at interrupt level.
 230  *
 231  * To build a frame, these ones must add
 232  *      - one FIRST_PACKET
 233  *      - 0 or many INTER_PACKETs
 234  *      - one LAST_PACKET
 235  * DISCARD_PACKET invalidates the whole frame.
 236  * On LAST_PACKET, a new frame is returned.
 237  */
 238 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 239                                     int packet_type,
 240                                     struct gspca_frame *frame,
 241                                     const __u8 *data,
 242                                     int len)
 243 {
 244         int i, j;
 245
 246         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 247
 248         /* when start of a new frame, if the current frame buffer
 249          * is not queued, discard the whole frame */
 250         if (packet_type == FIRST_PACKET) {
 251                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 252                                                 != V4L2_BUF_FLAG_QUEUED) {
 253                         gspca_dev->last_packet_type = DISCARD_PACKET;
 254                         return frame;
 255                 }
 256                 frame->data_end = frame->data;
 257                 jiffies_to_timeval(get_jiffies_64(),
 258                                    &frame->v4l2_buf.timestamp);
 259                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 260         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 261                 if (packet_type == LAST_PACKET)
 262                         gspca_dev->last_packet_type = packet_type;
 263                 return frame;
 264         }
 265
 266         /* append the packet to the frame buffer */
 267         if (len > 0) {
 268                 if (frame->data_end - frame->data + len
 269                                                  > frame->v4l2_buf.length) {
 270                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 271                                 frame->data_end - frame->data + len,
 272                                 frame->v4l2_buf.length);
 273                         packet_type = DISCARD_PACKET;
 274                 } else {
 275                         memcpy(frame->data_end, data, len);
 276                         frame->data_end += len;
 277                 }
 278         }
 279         gspca_dev->last_packet_type = packet_type;
 280
 281         /* if last packet, wake up the application and advance in the queue */
 282         if (packet_type == LAST_PACKET) {
 283                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 284                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 285                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 286                 atomic_inc(&gspca_dev->nevent);
 287                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 288                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 289                 gspca_dev->fr_i = i;
 290                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 291                         frame->v4l2_buf.bytesused,
 292                         gspca_dev->fr_q,
 293                         i,
 294                         gspca_dev->fr_o);
 295                 j = gspca_dev->fr_queue[i];
 296                 frame = &gspca_dev->frame[j];
 297         }
 298         return frame;
 299 }
 300 EXPORT_SYMBOL(gspca_frame_add);
 301
 302 static int gspca_is_compressed(__u32 format)
 303 {
 304         switch (format) {
 305         case V4L2_PIX_FMT_MJPEG:
 306         case V4L2_PIX_FMT_JPEG:
 307         case V4L2_PIX_FMT_SPCA561:
 308         case V4L2_PIX_FMT_PAC207:
 309                 return 1;
 310         }
 311         return 0;
 312 }
 313
 314 static void *rvmalloc(unsigned long size)
 315 {
 316         void *mem;
 317         unsigned long adr;
 318
 319 /*      size = PAGE_ALIGN(size);        (already done) */
 320         mem = vmalloc_32(size);
 321         if (mem != NULL) {
 322                 adr = (unsigned long) mem;
 323                 while ((long) size > 0) {
 324                         SetPageReserved(vmalloc_to_page((void *) adr));
 325                         adr += PAGE_SIZE;
 326                         size -= PAGE_SIZE;
 327                 }
 328         }
 329         return mem;
 330 }
 331
 332 static void rvfree(void *mem, long size)
 333 {
 334         unsigned long adr;
 335
 336         adr = (unsigned long) mem;
 337         while (size > 0) {
 338                 ClearPageReserved(vmalloc_to_page((void *) adr));
 339                 adr += PAGE_SIZE;
 340                 size -= PAGE_SIZE;
 341         }
 342         vfree(mem);
 343 }
 344
 345 static int frame_alloc(struct gspca_dev *gspca_dev,
 346                         unsigned int count)
 347 {
 348         struct gspca_frame *frame;
 349         unsigned int frsz;
 350         int i;
 351
 352         i = gspca_dev->curr_mode;
 353         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 354         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 355         frsz = PAGE_ALIGN(frsz);
 356         gspca_dev->frsz = frsz;
 357         if (count > GSPCA_MAX_FRAMES)
 358                 count = GSPCA_MAX_FRAMES;
 359         gspca_dev->frbuf = rvmalloc(frsz * count);
 360         if (!gspca_dev->frbuf) {
 361                 err("frame alloc failed");
 362                 return -ENOMEM;
 363         }
 364         gspca_dev->nframes = count;
 365         for (i = 0; i < count; i++) {
 366                 frame = &gspca_dev->frame[i];
 367                 frame->v4l2_buf.index = i;
 368                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 369                 frame->v4l2_buf.flags = 0;
 370                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 371                 frame->v4l2_buf.length = frsz;
 372                 frame->v4l2_buf.memory = gspca_dev->memory;
 373                 frame->v4l2_buf.sequence = 0;
 374                 frame->data = frame->data_end =
 375                                         gspca_dev->frbuf + i * frsz;
 376                 frame->v4l2_buf.m.offset = i * frsz;
 377         }
 378         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 379         gspca_dev->last_packet_type = DISCARD_PACKET;
 380         gspca_dev->sequence = 0;
 381         atomic_set(&gspca_dev->nevent, 0);
 382         return 0;
 383 }
 384
 385 static void frame_free(struct gspca_dev *gspca_dev)
 386 {
 387         int i;
 388
 389         PDEBUG(D_STREAM, "frame free");
 390         if (gspca_dev->frbuf != NULL) {
 391                 rvfree(gspca_dev->frbuf,
 392                         gspca_dev->nframes * gspca_dev->frsz);
 393                 gspca_dev->frbuf = NULL;
 394                 for (i = 0; i < gspca_dev->nframes; i++)
 395                         gspca_dev->frame[i].data = NULL;
 396         }
 397         gspca_dev->nframes = 0;
 398 }
 399
 400 static void destroy_urbs(struct gspca_dev *gspca_dev)
 401 {
 402         struct urb *urb;
 403         unsigned int i;
 404
 405         PDEBUG(D_STREAM, "kill transfer");
 406         for (i = 0; i < MAX_NURBS; ++i) {
 407                 urb = gspca_dev->urb[i];
 408                 if (urb == NULL)
 409                         break;
 410
 411                 gspca_dev->urb[i] = NULL;
 412                 usb_kill_urb(urb);
 413                 if (urb->transfer_buffer != NULL)
 414                         usb_buffer_free(gspca_dev->dev,
 415                                         urb->transfer_buffer_length,
 416                                         urb->transfer_buffer,
 417                                         urb->transfer_dma);
 418                 usb_free_urb(urb);
 419         }
 420 }
 421
 422 /*
 423  * look for an input transfer endpoint in an alternate setting
 424  */
 425 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 426                                           __u8 epaddr,
 427                                           __u8 xfer)
 428 {
 429         struct usb_host_endpoint *ep;
 430         int i, attr;
 431
 432         epaddr |= USB_DIR_IN;
 433         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 434                 ep = &alt->endpoint[i];
 435                 if (ep->desc.bEndpointAddress == epaddr) {
 436                         attr = ep->desc.bmAttributes
 437                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 438                         if (attr == xfer)
 439                                 return ep;
 440                         break;
 441                 }
 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 i, ret;
 459
 460         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 461         ep = NULL;
 462         i = gspca_dev->alt;                     /* previous alt setting */
 463         while (--i > 0) {                       /* alt 0 is unusable */
 464                 ep = alt_xfer(&intf->altsetting[i],
 465                                 gspca_dev->cam.epaddr,
 466                                 gspca_dev->bulk
 467                                         ? USB_ENDPOINT_XFER_BULK
 468                                         : USB_ENDPOINT_XFER_ISOC);
 469                 if (ep)
 470                         break;
 471         }
 472         if (ep == NULL) {
 473                 err("no transfer endpoint found");
 474                 return NULL;
 475         }
 476         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 477                         i, ep->desc.bEndpointAddress);
 478         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 479         if (ret < 0) {
 480                 err("set interface err %d", ret);
 481                 return NULL;
 482         }
 483         gspca_dev->alt = i;             /* memorize the current alt setting */
 484         return ep;
 485 }
 486
 487 /*
 488  * create the URBs for image transfer
 489  */
 490 static int create_urbs(struct gspca_dev *gspca_dev,
 491                         struct usb_host_endpoint *ep)
 492 {
 493         struct urb *urb;
 494         int n, nurbs, i, psize, npkt, bsize;
 495
 496         /* calculate the packet size and the number of packets */
 497         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 498
 499         /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 500         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 501         if (!gspca_dev->bulk) {
 502                 npkt = ISO_MAX_SIZE / psize;
 503                 if (npkt > ISO_MAX_PKT)
 504                         npkt = ISO_MAX_PKT;
 505                 bsize = psize * npkt;
 506                 PDEBUG(D_STREAM,
 507                         "isoc %d pkts size %d = bsize:%d",
 508                         npkt, psize, bsize);
 509                 nurbs = DEF_NURBS;
 510         } else {
 511                 npkt = 0;
 512                 bsize = psize;
 513                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 514                 nurbs = 1;
 515         }
 516
 517         gspca_dev->nurbs = nurbs;
 518         for (n = 0; n < nurbs; n++) {
 519                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 520                 if (!urb) {
 521                         err("usb_alloc_urb failed");
 522                         destroy_urbs(gspca_dev);
 523                         return -ENOMEM;
 524                 }
 525                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 526                                                 bsize,
 527                                                 GFP_KERNEL,
 528                                                 &urb->transfer_dma);
 529
 530                 if (urb->transfer_buffer == NULL) {
 531                         usb_free_urb(urb);
 532                         err("usb_buffer_urb failed");
 533                         destroy_urbs(gspca_dev);
 534                         return -ENOMEM;
 535                 }
 536                 gspca_dev->urb[n] = urb;
 537                 urb->dev = gspca_dev->dev;
 538                 urb->context = gspca_dev;
 539                 urb->transfer_buffer_length = bsize;
 540                 if (npkt != 0) {                /* ISOC */
 541                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 542                                                     ep->desc.bEndpointAddress);
 543                         urb->transfer_flags = URB_ISO_ASAP;
 544                         urb->interval = ep->desc.bInterval;
 545                         urb->complete = isoc_irq;
 546                         urb->number_of_packets = npkt;
 547                         for (i = 0; i < npkt; i++) {
 548                                 urb->iso_frame_desc[i].length = psize;
 549                                 urb->iso_frame_desc[i].offset = psize * i;
 550                         }
 551                 } else {                /* bulk */
 552                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 553                                                 ep->desc.bEndpointAddress),
 554                         urb->complete = bulk_irq;
 555                 }
 556         }
 557         return 0;
 558 }
 559
 560 /*
 561  * start the USB transfer
 562  */
 563 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 564 {
 565         struct usb_host_endpoint *ep;
 566         int n, ret;
 567
 568         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 569                 return -ERESTARTSYS;
 570
 571         /* set the higher alternate setting and
 572          * loop until urb submit succeeds */
 573         gspca_dev->alt = gspca_dev->nbalt;
 574         for (;;) {
 575                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 576                 ep = get_ep(gspca_dev);
 577                 if (ep == NULL) {
 578                         ret = -EIO;
 579                         goto out;
 580                 }
 581                 ret = create_urbs(gspca_dev, ep);
 582                 if (ret < 0)
 583                         goto out;
 584
 585                 /* start the cam */
 586                 ret = gspca_dev->sd_desc->start(gspca_dev);
 587                 if (ret < 0) {
 588                         destroy_urbs(gspca_dev);
 589                         goto out;
 590                 }
 591                 gspca_dev->streaming = 1;
 592                 atomic_set(&gspca_dev->nevent, 0);
 593
 594                 /* bulk transfers are started by the subdriver */
 595                 if (gspca_dev->bulk)
 596                         break;
 597
 598                 /* submit the URBs */
 599                 for (n = 0; n < gspca_dev->nurbs; n++) {
 600                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 601                         if (ret < 0) {
 602                                 PDEBUG(D_ERR|D_STREAM,
 603                                         "usb_submit_urb [%d] err %d", n, ret);
 604                                 gspca_dev->streaming = 0;
 605                                 destroy_urbs(gspca_dev);
 606                                 if (ret == -ENOSPC)
 607                                         break;  /* try the previous alt */
 608                                 goto out;
 609                         }
 610                 }
 611                 if (ret >= 0)
 612                         break;
 613         }
 614 out:
 615         mutex_unlock(&gspca_dev->usb_lock);
 616         return ret;
 617 }
 618
 619 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 620 {
 621         int ret;
 622
 623         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 624         if (ret < 0)
 625                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 626         return ret;
 627 }
 628
 629 /* Note: both the queue and the usb locks should be held when calling this */
 630 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 631 {
 632         gspca_dev->streaming = 0;
 633         atomic_set(&gspca_dev->nevent, 0);
 634         if (gspca_dev->present) {
 635                 if (gspca_dev->sd_desc->stopN)
 636                         gspca_dev->sd_desc->stopN(gspca_dev);
 637                 destroy_urbs(gspca_dev);
 638                 gspca_set_alt0(gspca_dev);
 639                 if (gspca_dev->sd_desc->stop0)
 640                         gspca_dev->sd_desc->stop0(gspca_dev);
 641                 PDEBUG(D_STREAM, "stream off OK");
 642         }
 643 }
 644
 645 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 646 {
 647         int i;
 648
 649         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 650         gspca_dev->curr_mode = i;
 651         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 652         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 653         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 654 }
 655
 656 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 657                         int width, int height)
 658 {
 659         int i;
 660
 661         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 662                 if (width >= gspca_dev->cam.cam_mode[i].width
 663                     && height >= gspca_dev->cam.cam_mode[i].height)
 664                         break;
 665         }
 666         return i;
 667 }
 668
 669 /*
 670  * search a mode with the right pixel format
 671  */
 672 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 673                         int mode,
 674                         int pixfmt)
 675 {
 676         int modeU, modeD;
 677
 678         modeU = modeD = mode;
 679         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 680                 if (--modeD >= 0) {
 681                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 682                                                                 == pixfmt)
 683                                 return modeD;
 684                 }
 685                 if (++modeU < gspca_dev->cam.nmodes) {
 686                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 687                                                                 == pixfmt)
 688                                 return modeU;
 689                 }
 690         }
 691         return -EINVAL;
 692 }
 693
 694 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 695                                 struct v4l2_fmtdesc *fmtdesc)
 696 {
 697         struct gspca_dev *gspca_dev = priv;
 698         int i, j, index;
 699         __u32 fmt_tb[8];
 700
 701         /* give an index to each format */
 702         index = 0;
 703         j = 0;
 704         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 705                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 706                 j = 0;
 707                 for (;;) {
 708                         if (fmt_tb[j] == fmt_tb[index])
 709                                 break;
 710                         j++;
 711                 }
 712                 if (j == index) {
 713                         if (fmtdesc->index == index)
 714                                 break;          /* new format */
 715                         index++;
 716                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 717                                 return -EINVAL;
 718                 }
 719         }
 720         if (i < 0)
 721                 return -EINVAL;         /* no more format */
 722
 723         fmtdesc->pixelformat = fmt_tb[index];
 724         if (gspca_is_compressed(fmt_tb[index]))
 725                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 726         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 727         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 728         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 729         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 730         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 731         fmtdesc->description[4] = '\0';
 732         return 0;
 733 }
 734
 735 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 736                             struct v4l2_format *fmt)
 737 {
 738         struct gspca_dev *gspca_dev = priv;
 739         int mode;
 740
 741         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 742                 return -EINVAL;
 743         mode = gspca_dev->curr_mode;
 744         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 745                 sizeof fmt->fmt.pix);
 746         return 0;
 747 }
 748
 749 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 750                         struct v4l2_format *fmt)
 751 {
 752         int w, h, mode, mode2;
 753
 754         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 755                 return -EINVAL;
 756         w = fmt->fmt.pix.width;
 757         h = fmt->fmt.pix.height;
 758
 759 #ifdef GSPCA_DEBUG
 760         if (gspca_debug & D_CONF)
 761                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 762 #endif
 763         /* search the closest mode for width and height */
 764         mode = wxh_to_mode(gspca_dev, w, h);
 765
 766         /* OK if right palette */
 767         if (gspca_dev->cam.cam_mode[mode].pixelformat
 768                                                 != fmt->fmt.pix.pixelformat) {
 769
 770                 /* else, search the closest mode with the same pixel format */
 771                 mode2 = gspca_get_mode(gspca_dev, mode,
 772                                         fmt->fmt.pix.pixelformat);
 773                 if (mode2 >= 0)
 774                         mode = mode2;
 775 /*              else
 776                         ;                * no chance, return this mode */
 777         }
 778         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 779                 sizeof fmt->fmt.pix);
 780         return mode;                    /* used when s_fmt */
 781 }
 782
 783 static int vidioc_try_fmt_vid_cap(struct file *file,
 784                               void *priv,
 785                               struct v4l2_format *fmt)
 786 {
 787         struct gspca_dev *gspca_dev = priv;
 788         int ret;
 789
 790         ret = try_fmt_vid_cap(gspca_dev, fmt);
 791         if (ret < 0)
 792                 return ret;
 793         return 0;
 794 }
 795
 796 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 797                             struct v4l2_format *fmt)
 798 {
 799         struct gspca_dev *gspca_dev = priv;
 800         int ret;
 801
 802         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 803                 return -ERESTARTSYS;
 804
 805         ret = try_fmt_vid_cap(gspca_dev, fmt);
 806         if (ret < 0)
 807                 goto out;
 808
 809         if (gspca_dev->nframes != 0
 810             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 811                 ret = -EINVAL;
 812                 goto out;
 813         }
 814
 815         if (ret == gspca_dev->curr_mode) {
 816                 ret = 0;
 817                 goto out;                       /* same mode */
 818         }
 819
 820         if (gspca_dev->streaming) {
 821                 ret = -EBUSY;
 822                 goto out;
 823         }
 824         gspca_dev->width = fmt->fmt.pix.width;
 825         gspca_dev->height = fmt->fmt.pix.height;
 826         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 827         gspca_dev->curr_mode = ret;
 828
 829         ret = 0;
 830 out:
 831         mutex_unlock(&gspca_dev->queue_lock);
 832         return ret;
 833 }
 834
 835 static int dev_open(struct inode *inode, struct file *file)
 836 {
 837         struct gspca_dev *gspca_dev;
 838         int ret;
 839
 840         PDEBUG(D_STREAM, "%s open", current->comm);
 841         gspca_dev = (struct gspca_dev *) video_devdata(file);
 842         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 843                 return -ERESTARTSYS;
 844         if (!gspca_dev->present) {
 845                 ret = -ENODEV;
 846                 goto out;
 847         }
 848
 849         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 850                 ret = -EBUSY;
 851                 goto out;
 852         }
 853         gspca_dev->users++;
 854         file->private_data = gspca_dev;
 855 #ifdef GSPCA_DEBUG
 856         /* activate the v4l2 debug */
 857         if (gspca_debug & D_V4L2)
 858                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 859                                         | V4L2_DEBUG_IOCTL_ARG;
 860         else
 861                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 862                                         | V4L2_DEBUG_IOCTL_ARG);
 863 #endif
 864         ret = 0;
 865 out:
 866         mutex_unlock(&gspca_dev->queue_lock);
 867         if (ret != 0)
 868                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 869         else
 870                 PDEBUG(D_STREAM, "open done");
 871         return ret;
 872 }
 873
 874 static int dev_close(struct inode *inode, struct file *file)
 875 {
 876         struct gspca_dev *gspca_dev = file->private_data;
 877
 878         PDEBUG(D_STREAM, "%s close", current->comm);
 879         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 880                 return -ERESTARTSYS;
 881         gspca_dev->users--;
 882
 883         /* if the file did the capture, free the streaming resources */
 884         if (gspca_dev->capt_file == file) {
 885                 if (gspca_dev->streaming) {
 886                         mutex_lock(&gspca_dev->usb_lock);
 887                         gspca_stream_off(gspca_dev);
 888                         mutex_unlock(&gspca_dev->usb_lock);
 889                 }
 890                 frame_free(gspca_dev);
 891                 gspca_dev->capt_file = NULL;
 892                 gspca_dev->memory = GSPCA_MEMORY_NO;
 893         }
 894         file->private_data = NULL;
 895         mutex_unlock(&gspca_dev->queue_lock);
 896         PDEBUG(D_STREAM, "close done");
 897         return 0;
 898 }
 899
 900 static int vidioc_querycap(struct file *file, void  *priv,
 901                            struct v4l2_capability *cap)
 902 {
 903         struct gspca_dev *gspca_dev = priv;
 904
 905         memset(cap, 0, sizeof *cap);
 906         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 907 /*      strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
 908         if (gspca_dev->dev->product != NULL) {
 909                 strncpy(cap->card, gspca_dev->dev->product,
 910                         sizeof cap->card);
 911         } else {
 912                 snprintf(cap->card, sizeof cap->card,
 913                         "USB Camera (%04x:%04x)",
 914                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 915                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 916         }
 917         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 918                 sizeof cap->bus_info);
 919         cap->version = DRIVER_VERSION_NUMBER;
 920         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 921                           | V4L2_CAP_STREAMING
 922                           | V4L2_CAP_READWRITE;
 923         return 0;
 924 }
 925
 926 static int vidioc_queryctrl(struct file *file, void *priv,
 927                            struct v4l2_queryctrl *q_ctrl)
 928 {
 929         struct gspca_dev *gspca_dev = priv;
 930         int i, ix;
 931         u32 id;
 932
 933         ix = -1;
 934         id = q_ctrl->id;
 935         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 936                 id &= V4L2_CTRL_ID_MASK;
 937                 id++;
 938                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 939                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 940                                 continue;
 941                         if (ix < 0) {
 942                                 ix = i;
 943                                 continue;
 944                         }
 945                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 946                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 947                                 continue;
 948                         ix = i;
 949                 }
 950         }
 951         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 952                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 953                         ix = i;
 954                         break;
 955                 }
 956         }
 957         if (ix < 0)
 958                 return -EINVAL;
 959         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 960                 sizeof *q_ctrl);
 961         if (gspca_dev->ctrl_dis & (1 << ix))
 962                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 963         return 0;
 964 }
 965
 966 static int vidioc_s_ctrl(struct file *file, void *priv,
 967                          struct v4l2_control *ctrl)
 968 {
 969         struct gspca_dev *gspca_dev = priv;
 970         const struct ctrl *ctrls;
 971         int i, ret;
 972
 973         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 974              i < gspca_dev->sd_desc->nctrls;
 975              i++, ctrls++) {
 976                 if (ctrl->id != ctrls->qctrl.id)
 977                         continue;
 978                 if (gspca_dev->ctrl_dis & (1 << i))
 979                         return -EINVAL;
 980                 if (ctrl->value < ctrls->qctrl.minimum
 981                     || ctrl->value > ctrls->qctrl.maximum)
 982                         return -ERANGE;
 983                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
 984                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 985                         return -ERESTARTSYS;
 986                 ret = ctrls->set(gspca_dev, ctrl->value);
 987                 mutex_unlock(&gspca_dev->usb_lock);
 988                 return ret;
 989         }
 990         return -EINVAL;
 991 }
 992
 993 static int vidioc_g_ctrl(struct file *file, void *priv,
 994                          struct v4l2_control *ctrl)
 995 {
 996         struct gspca_dev *gspca_dev = priv;
 997
 998         const struct ctrl *ctrls;
 999         int i, ret;
1000
1001         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1002              i < gspca_dev->sd_desc->nctrls;
1003              i++, ctrls++) {
1004                 if (ctrl->id != ctrls->qctrl.id)
1005                         continue;
1006                 if (gspca_dev->ctrl_dis & (1 << i))
1007                         return -EINVAL;
1008                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1009                         return -ERESTARTSYS;
1010                 ret = ctrls->get(gspca_dev, &ctrl->value);
1011                 mutex_unlock(&gspca_dev->usb_lock);
1012                 return ret;
1013         }
1014         return -EINVAL;
1015 }
1016
1017 static int vidioc_querymenu(struct file *file, void *priv,
1018                             struct v4l2_querymenu *qmenu)
1019 {
1020         struct gspca_dev *gspca_dev = priv;
1021
1022         if (!gspca_dev->sd_desc->querymenu)
1023                 return -EINVAL;
1024         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1025 }
1026
1027 static int vidioc_enum_input(struct file *file, void *priv,
1028                                 struct v4l2_input *input)
1029 {
1030         struct gspca_dev *gspca_dev = priv;
1031
1032         if (input->index != 0)
1033                 return -EINVAL;
1034         memset(input, 0, sizeof *input);
1035         input->type = V4L2_INPUT_TYPE_CAMERA;
1036         strncpy(input->name, gspca_dev->sd_desc->name,
1037                 sizeof input->name);
1038         return 0;
1039 }
1040
1041 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1042 {
1043         *i = 0;
1044         return 0;
1045 }
1046
1047 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1048 {
1049         if (i > 0)
1050                 return -EINVAL;
1051         return (0);
1052 }
1053
1054 static int vidioc_reqbufs(struct file *file, void *priv,
1055                           struct v4l2_requestbuffers *rb)
1056 {
1057         struct gspca_dev *gspca_dev = priv;
1058         int i, ret = 0;
1059
1060         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1061                 return -EINVAL;
1062         switch (rb->memory) {
1063         case GSPCA_MEMORY_READ:                 /* (internal call) */
1064         case V4L2_MEMORY_MMAP:
1065         case V4L2_MEMORY_USERPTR:
1066                 break;
1067         default:
1068                 return -EINVAL;
1069         }
1070         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1071                 return -ERESTARTSYS;
1072
1073         if (gspca_dev->memory != GSPCA_MEMORY_NO
1074             && gspca_dev->memory != rb->memory) {
1075                 ret = -EBUSY;
1076                 goto out;
1077         }
1078
1079         /* only one file may do the capture */
1080         if (gspca_dev->capt_file != NULL
1081             && gspca_dev->capt_file != file) {
1082                 ret = -EBUSY;
1083                 goto out;
1084         }
1085
1086         /* if allocated, the buffers must not be mapped */
1087         for (i = 0; i < gspca_dev->nframes; i++) {
1088                 if (gspca_dev->frame[i].vma_use_count) {
1089                         ret = -EBUSY;
1090                         goto out;
1091                 }
1092         }
1093
1094         /* stop streaming */
1095         if (gspca_dev->streaming) {
1096                 mutex_lock(&gspca_dev->usb_lock);
1097                 gspca_stream_off(gspca_dev);
1098                 mutex_unlock(&gspca_dev->usb_lock);
1099         }
1100
1101         /* free the previous allocated buffers, if any */
1102         if (gspca_dev->nframes != 0) {
1103                 frame_free(gspca_dev);
1104                 gspca_dev->capt_file = NULL;
1105         }
1106         if (rb->count == 0)                     /* unrequest */
1107                 goto out;
1108         gspca_dev->memory = rb->memory;
1109         ret = frame_alloc(gspca_dev, rb->count);
1110         if (ret == 0) {
1111                 rb->count = gspca_dev->nframes;
1112                 gspca_dev->capt_file = file;
1113         }
1114 out:
1115         mutex_unlock(&gspca_dev->queue_lock);
1116         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1117         return ret;
1118 }
1119
1120 static int vidioc_querybuf(struct file *file, void *priv,
1121                            struct v4l2_buffer *v4l2_buf)
1122 {
1123         struct gspca_dev *gspca_dev = priv;
1124         struct gspca_frame *frame;
1125
1126         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1127             || v4l2_buf->index < 0
1128             || v4l2_buf->index >= gspca_dev->nframes)
1129                 return -EINVAL;
1130
1131         frame = &gspca_dev->frame[v4l2_buf->index];
1132         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1133         return 0;
1134 }
1135
1136 static int vidioc_streamon(struct file *file, void *priv,
1137                            enum v4l2_buf_type buf_type)
1138 {
1139         struct gspca_dev *gspca_dev = priv;
1140         int ret;
1141
1142         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1143                 return -EINVAL;
1144         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1145                 return -ERESTARTSYS;
1146         if (!gspca_dev->present) {
1147                 ret = -ENODEV;
1148                 goto out;
1149         }
1150         if (gspca_dev->nframes == 0) {
1151                 ret = -EINVAL;
1152                 goto out;
1153         }
1154         if (!gspca_dev->streaming) {
1155                 ret = gspca_init_transfer(gspca_dev);
1156                 if (ret < 0)
1157                         goto out;
1158         }
1159 #ifdef GSPCA_DEBUG
1160         if (gspca_debug & D_STREAM) {
1161                 PDEBUG_MODE("stream on OK",
1162                         gspca_dev->pixfmt,
1163                         gspca_dev->width,
1164                         gspca_dev->height);
1165         }
1166 #endif
1167         ret = 0;
1168 out:
1169         mutex_unlock(&gspca_dev->queue_lock);
1170         return ret;
1171 }
1172
1173 static int vidioc_streamoff(struct file *file, void *priv,
1174                                 enum v4l2_buf_type buf_type)
1175 {
1176         struct gspca_dev *gspca_dev = priv;
1177         int i, ret;
1178
1179         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1180                 return -EINVAL;
1181         if (!gspca_dev->streaming)
1182                 return 0;
1183         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1184                 return -ERESTARTSYS;
1185
1186         /* stop streaming */
1187         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1188                 ret = -ERESTARTSYS;
1189                 goto out;
1190         }
1191         gspca_stream_off(gspca_dev);
1192         mutex_unlock(&gspca_dev->usb_lock);
1193
1194         /* empty the application queues */
1195         for (i = 0; i < gspca_dev->nframes; i++)
1196                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1197         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1198         gspca_dev->last_packet_type = DISCARD_PACKET;
1199         gspca_dev->sequence = 0;
1200         atomic_set(&gspca_dev->nevent, 0);
1201         ret = 0;
1202 out:
1203         mutex_unlock(&gspca_dev->queue_lock);
1204         return ret;
1205 }
1206
1207 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1208                         struct v4l2_jpegcompression *jpegcomp)
1209 {
1210         struct gspca_dev *gspca_dev = priv;
1211         int ret;
1212
1213         if (!gspca_dev->sd_desc->get_jcomp)
1214                 return -EINVAL;
1215         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1216                 return -ERESTARTSYS;
1217         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1218         mutex_unlock(&gspca_dev->usb_lock);
1219         return ret;
1220 }
1221
1222 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1223                         struct v4l2_jpegcompression *jpegcomp)
1224 {
1225         struct gspca_dev *gspca_dev = priv;
1226         int ret;
1227
1228         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1229                 return -ERESTARTSYS;
1230         if (!gspca_dev->sd_desc->set_jcomp)
1231                 return -EINVAL;
1232         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1233         mutex_unlock(&gspca_dev->usb_lock);
1234         return ret;
1235 }
1236
1237 static int vidioc_g_parm(struct file *filp, void *priv,
1238                         struct v4l2_streamparm *parm)
1239 {
1240         struct gspca_dev *gspca_dev = priv;
1241
1242         memset(parm, 0, sizeof *parm);
1243         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1244         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1245         return 0;
1246 }
1247
1248 static int vidioc_s_parm(struct file *filp, void *priv,
1249                         struct v4l2_streamparm *parm)
1250 {
1251         struct gspca_dev *gspca_dev = priv;
1252         int n;
1253
1254         n = parm->parm.capture.readbuffers;
1255         if (n == 0 || n > GSPCA_MAX_FRAMES)
1256                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1257         else
1258                 gspca_dev->nbufread = n;
1259         return 0;
1260 }
1261
1262 static int vidioc_s_std(struct file *filp, void *priv,
1263                         v4l2_std_id *parm)
1264 {
1265         return 0;
1266 }
1267
1268 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1269 static int vidiocgmbuf(struct file *file, void *priv,
1270                         struct video_mbuf *mbuf)
1271 {
1272         struct gspca_dev *gspca_dev = file->private_data;
1273         int i;
1274
1275         PDEBUG(D_STREAM, "cgmbuf");
1276         if (gspca_dev->nframes == 0) {
1277                 int ret;
1278
1279                 {
1280                         struct v4l2_format fmt;
1281
1282                         memset(&fmt, 0, sizeof fmt);
1283                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1284                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1285                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1286                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1287                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1288                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1289                         if (ret != 0)
1290                                 return ret;
1291                 }
1292                 {
1293                         struct v4l2_requestbuffers rb;
1294
1295                         memset(&rb, 0, sizeof rb);
1296                         rb.count = 4;
1297                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1298                         rb.memory = V4L2_MEMORY_MMAP;
1299                         ret = vidioc_reqbufs(file, priv, &rb);
1300                         if (ret != 0)
1301                                 return ret;
1302                 }
1303         }
1304         mbuf->frames = gspca_dev->nframes;
1305         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1306         for (i = 0; i < mbuf->frames; i++)
1307                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1308         return 0;
1309 }
1310 #endif
1311
1312 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1313 {
1314         struct gspca_dev *gspca_dev = file->private_data;
1315         struct gspca_frame *frame;
1316         struct page *page;
1317         unsigned long addr, start, size;
1318         int i, ret;
1319
1320         start = vma->vm_start;
1321         size = vma->vm_end - vma->vm_start;
1322         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1323
1324         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1325                 return -ERESTARTSYS;
1326         if (!gspca_dev->present) {
1327                 ret = -ENODEV;
1328                 goto out;
1329         }
1330         if (gspca_dev->capt_file != file) {
1331                 ret = -EINVAL;
1332                 goto out;
1333         }
1334
1335         frame = NULL;
1336         for (i = 0; i < gspca_dev->nframes; ++i) {
1337                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1338                         PDEBUG(D_STREAM, "mmap bad memory type");
1339                         break;
1340                 }
1341                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1342                                                 == vma->vm_pgoff) {
1343                         frame = &gspca_dev->frame[i];
1344                         break;
1345                 }
1346         }
1347         if (frame == NULL) {
1348                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1349                 ret = -EINVAL;
1350                 goto out;
1351         }
1352 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1353         /* v4l1 maps all the buffers */
1354         if (i != 0
1355             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1356 #endif
1357             if (size != frame->v4l2_buf.length) {
1358                 PDEBUG(D_STREAM, "mmap bad size");
1359                 ret = -EINVAL;
1360                 goto out;
1361         }
1362
1363         /*
1364          * - VM_IO marks the area as being a mmaped region for I/O to a
1365          *   device. It also prevents the region from being core dumped.
1366          */
1367         vma->vm_flags |= VM_IO;
1368
1369         addr = (unsigned long) frame->data;
1370         while (size > 0) {
1371                 page = vmalloc_to_page((void *) addr);
1372                 ret = vm_insert_page(vma, start, page);
1373                 if (ret < 0)
1374                         goto out;
1375                 start += PAGE_SIZE;
1376                 addr += PAGE_SIZE;
1377                 size -= PAGE_SIZE;
1378         }
1379
1380         vma->vm_ops = &gspca_vm_ops;
1381         vma->vm_private_data = frame;
1382         gspca_vm_open(vma);
1383         ret = 0;
1384 out:
1385         mutex_unlock(&gspca_dev->queue_lock);
1386         return ret;
1387 }
1388
1389 /*
1390  * wait for a video frame
1391  *
1392  * If a frame is ready, its index is returned.
1393  */
1394 static int frame_wait(struct gspca_dev *gspca_dev,
1395                         int nonblock_ing)
1396 {
1397         struct gspca_frame *frame;
1398         int i, j, ret;
1399
1400         /* check if a frame is ready */
1401         i = gspca_dev->fr_o;
1402         j = gspca_dev->fr_queue[i];
1403         frame = &gspca_dev->frame[j];
1404         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1405                 atomic_dec(&gspca_dev->nevent);
1406                 goto ok;
1407         }
1408         if (nonblock_ing)                       /* no frame yet */
1409                 return -EAGAIN;
1410
1411         /* wait till a frame is ready */
1412         for (;;) {
1413                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1414                                         atomic_read(&gspca_dev->nevent) > 0,
1415                                         msecs_to_jiffies(3000));
1416                 if (ret <= 0) {
1417                         if (ret < 0)
1418                                 return ret;     /* interrupt */
1419                         return -EIO;            /* timeout */
1420                 }
1421                 atomic_dec(&gspca_dev->nevent);
1422                 if (!gspca_dev->streaming || !gspca_dev->present)
1423                         return -EIO;
1424                 i = gspca_dev->fr_o;
1425                 j = gspca_dev->fr_queue[i];
1426                 frame = &gspca_dev->frame[j];
1427                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1428                         break;
1429         }
1430 ok:
1431         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1432         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1433                 gspca_dev->fr_q,
1434                 gspca_dev->fr_i,
1435                 gspca_dev->fr_o);
1436
1437         if (gspca_dev->sd_desc->dq_callback) {
1438                 mutex_lock(&gspca_dev->usb_lock);
1439                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1440                 mutex_unlock(&gspca_dev->usb_lock);
1441         }
1442         return j;
1443 }
1444
1445 /*
1446  * dequeue a video buffer
1447  *
1448  * If nonblock_ing is false, block until a buffer is available.
1449  */
1450 static int vidioc_dqbuf(struct file *file, void *priv,
1451                         struct v4l2_buffer *v4l2_buf)
1452 {
1453         struct gspca_dev *gspca_dev = priv;
1454         struct gspca_frame *frame;
1455         int i, ret;
1456
1457         PDEBUG(D_FRAM, "dqbuf");
1458         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1459                 return -EINVAL;
1460         if (v4l2_buf->memory != gspca_dev->memory)
1461                 return -EINVAL;
1462
1463         /* if not streaming, be sure the application will not loop forever */
1464         if (!(file->f_flags & O_NONBLOCK)
1465             && !gspca_dev->streaming && gspca_dev->users == 1)
1466                 return -EINVAL;
1467
1468         /* only the capturing file may dequeue */
1469         if (gspca_dev->capt_file != file)
1470                 return -EINVAL;
1471
1472         /* only one dequeue / read at a time */
1473         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1474                 return -ERESTARTSYS;
1475
1476         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1477         if (ret < 0)
1478                 goto out;
1479         i = ret;                                /* frame index */
1480         frame = &gspca_dev->frame[i];
1481         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1482                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1483                                  frame->data,
1484                                  frame->v4l2_buf.bytesused)) {
1485                         PDEBUG(D_ERR|D_STREAM,
1486                                 "dqbuf cp to user failed");
1487                         ret = -EFAULT;
1488                         goto out;
1489                 }
1490         }
1491         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1492         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1493         PDEBUG(D_FRAM, "dqbuf %d", i);
1494         ret = 0;
1495 out:
1496         mutex_unlock(&gspca_dev->read_lock);
1497         return ret;
1498 }
1499
1500 /*
1501  * queue a video buffer
1502  *
1503  * Attempting to queue a buffer that has already been
1504  * queued will return -EINVAL.
1505  */
1506 static int vidioc_qbuf(struct file *file, void *priv,
1507                         struct v4l2_buffer *v4l2_buf)
1508 {
1509         struct gspca_dev *gspca_dev = priv;
1510         struct gspca_frame *frame;
1511         int i, index, ret;
1512
1513         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1514         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1515                 return -EINVAL;
1516
1517         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1518                 return -ERESTARTSYS;
1519
1520         index = v4l2_buf->index;
1521         if ((unsigned) index >= gspca_dev->nframes) {
1522                 PDEBUG(D_FRAM,
1523                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1524                 ret = -EINVAL;
1525                 goto out;
1526         }
1527         if (v4l2_buf->memory != gspca_dev->memory) {
1528                 PDEBUG(D_FRAM, "qbuf bad memory type");
1529                 ret = -EINVAL;
1530                 goto out;
1531         }
1532
1533         frame = &gspca_dev->frame[index];
1534         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1535                 PDEBUG(D_FRAM, "qbuf bad state");
1536                 ret = -EINVAL;
1537                 goto out;
1538         }
1539
1540         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1541 /*      frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1542
1543         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1544                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1545                 frame->v4l2_buf.length = v4l2_buf->length;
1546         }
1547
1548         /* put the buffer in the 'queued' queue */
1549         i = gspca_dev->fr_q;
1550         gspca_dev->fr_queue[i] = index;
1551         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1552         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1553                 gspca_dev->fr_q,
1554                 gspca_dev->fr_i,
1555                 gspca_dev->fr_o);
1556
1557         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1558         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1559         ret = 0;
1560 out:
1561         mutex_unlock(&gspca_dev->queue_lock);
1562         return ret;
1563 }
1564
1565 /*
1566  * allocate the resources for read()
1567  */
1568 static int read_alloc(struct gspca_dev *gspca_dev,
1569                         struct file *file)
1570 {
1571         struct v4l2_buffer v4l2_buf;
1572         int i, ret;
1573
1574         PDEBUG(D_STREAM, "read alloc");
1575         if (gspca_dev->nframes == 0) {
1576                 struct v4l2_requestbuffers rb;
1577
1578                 memset(&rb, 0, sizeof rb);
1579                 rb.count = gspca_dev->nbufread;
1580                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1581                 rb.memory = GSPCA_MEMORY_READ;
1582                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1583                 if (ret != 0) {
1584                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1585                         return ret;
1586                 }
1587                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1588                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1589                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1590                 for (i = 0; i < gspca_dev->nbufread; i++) {
1591                         v4l2_buf.index = i;
1592                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1593                         if (ret != 0) {
1594                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1595                                 return ret;
1596                         }
1597                 }
1598                 gspca_dev->memory = GSPCA_MEMORY_READ;
1599         }
1600
1601         /* start streaming */
1602         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1603         if (ret != 0)
1604                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1605         return ret;
1606 }
1607
1608 static unsigned int dev_poll(struct file *file, poll_table *wait)
1609 {
1610         struct gspca_dev *gspca_dev = file->private_data;
1611         int i, ret;
1612
1613         PDEBUG(D_FRAM, "poll");
1614
1615         poll_wait(file, &gspca_dev->wq, wait);
1616         if (!gspca_dev->present)
1617                 return POLLERR;
1618
1619         /* if reqbufs is not done, the user would use read() */
1620         if (gspca_dev->nframes == 0) {
1621                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1622                         return POLLERR;         /* not the 1st time */
1623                 ret = read_alloc(gspca_dev, file);
1624                 if (ret != 0)
1625                         return POLLERR;
1626         }
1627
1628         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1629                 return POLLERR;
1630         if (!gspca_dev->present) {
1631                 ret = POLLERR;
1632                 goto out;
1633         }
1634
1635         /* check the next incoming buffer */
1636         i = gspca_dev->fr_o;
1637         i = gspca_dev->fr_queue[i];
1638         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1639                 ret = POLLIN | POLLRDNORM;      /* something to read */
1640         else
1641                 ret = 0;
1642 out:
1643         mutex_unlock(&gspca_dev->queue_lock);
1644         return ret;
1645 }
1646
1647 static ssize_t dev_read(struct file *file, char __user *data,
1648                     size_t count, loff_t *ppos)
1649 {
1650         struct gspca_dev *gspca_dev = file->private_data;
1651         struct gspca_frame *frame;
1652         struct v4l2_buffer v4l2_buf;
1653         struct timeval timestamp;
1654         int n, ret, ret2;
1655
1656         PDEBUG(D_FRAM, "read (%zd)", count);
1657         if (!gspca_dev->present)
1658                 return -ENODEV;
1659         switch (gspca_dev->memory) {
1660         case GSPCA_MEMORY_NO:                   /* first time */
1661                 ret = read_alloc(gspca_dev, file);
1662                 if (ret != 0)
1663                         return ret;
1664                 break;
1665         case GSPCA_MEMORY_READ:
1666                 if (gspca_dev->capt_file == file)
1667                         break;
1668                 /* fall thru */
1669         default:
1670                 return -EINVAL;
1671         }
1672
1673         /* get a frame */
1674         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1675         timestamp.tv_sec--;
1676         n = 2;
1677         for (;;) {
1678                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1679                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1680                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1681                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1682                 if (ret != 0) {
1683                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1684                         return ret;
1685                 }
1686
1687                 /* if the process slept for more than 1 second,
1688                  * get a newer frame */
1689                 frame = &gspca_dev->frame[v4l2_buf.index];
1690                 if (--n < 0)
1691                         break;                  /* avoid infinite loop */
1692                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1693                         break;
1694                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1695                 if (ret != 0) {
1696                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1697                         return ret;
1698                 }
1699         }
1700
1701         /* copy the frame */
1702         if (count > frame->v4l2_buf.bytesused)
1703                 count = frame->v4l2_buf.bytesused;
1704         ret = copy_to_user(data, frame->data, count);
1705         if (ret != 0) {
1706                 PDEBUG(D_ERR|D_STREAM,
1707                         "read cp to user lack %d / %zd", ret, count);
1708                 ret = -EFAULT;
1709                 goto out;
1710         }
1711         ret = count;
1712 out:
1713         /* in each case, requeue the buffer */
1714         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1715         if (ret2 != 0)
1716                 return ret2;
1717         return ret;
1718 }
1719
1720 static void dev_release(struct video_device *vfd)
1721 {
1722         /* nothing */
1723 }
1724
1725 static struct file_operations dev_fops = {
1726         .owner = THIS_MODULE,
1727         .open = dev_open,
1728         .release = dev_close,
1729         .read = dev_read,
1730         .mmap = dev_mmap,
1731         .ioctl = video_ioctl2,
1732 #ifdef CONFIG_COMPAT
1733         .compat_ioctl = v4l_compat_ioctl32,
1734 #endif
1735         .llseek = no_llseek,
1736         .poll   = dev_poll,
1737 };
1738
1739 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1740         .vidioc_querycap        = vidioc_querycap,
1741         .vidioc_dqbuf           = vidioc_dqbuf,
1742         .vidioc_qbuf            = vidioc_qbuf,
1743         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1744         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1745         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1746         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1747         .vidioc_streamon        = vidioc_streamon,
1748         .vidioc_queryctrl       = vidioc_queryctrl,
1749         .vidioc_g_ctrl          = vidioc_g_ctrl,
1750         .vidioc_s_ctrl          = vidioc_s_ctrl,
1751         .vidioc_querymenu       = vidioc_querymenu,
1752         .vidioc_enum_input      = vidioc_enum_input,
1753         .vidioc_g_input         = vidioc_g_input,
1754         .vidioc_s_input         = vidioc_s_input,
1755         .vidioc_reqbufs         = vidioc_reqbufs,
1756         .vidioc_querybuf        = vidioc_querybuf,
1757         .vidioc_streamoff       = vidioc_streamoff,
1758         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1759         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1760         .vidioc_g_parm          = vidioc_g_parm,
1761         .vidioc_s_parm          = vidioc_s_parm,
1762         .vidioc_s_std           = vidioc_s_std,
1763 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1764         .vidiocgmbuf          = vidiocgmbuf,
1765 #endif
1766 };
1767
1768 static struct video_device gspca_template = {
1769         .name = "gspca main driver",
1770         .fops = &dev_fops,
1771         .ioctl_ops = &dev_ioctl_ops,
1772         .release = dev_release,         /* mandatory */
1773         .minor = -1,
1774 };
1775
1776 /*
1777  * probe and create a new gspca device
1778  *
1779  * This function must be called by the sub-driver when it is
1780  * called for probing a new device.
1781  */
1782 int gspca_dev_probe(struct usb_interface *intf,
1783                 const struct usb_device_id *id,
1784                 const struct sd_desc *sd_desc,
1785                 int dev_size,
1786                 struct module *module)
1787 {
1788         struct usb_interface_descriptor *interface;
1789         struct gspca_dev *gspca_dev;
1790         struct usb_device *dev = interface_to_usbdev(intf);
1791         int ret;
1792
1793         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1794
1795         /* we don't handle multi-config cameras */
1796         if (dev->descriptor.bNumConfigurations != 1)
1797                 return -ENODEV;
1798         interface = &intf->cur_altsetting->desc;
1799         if (interface->bInterfaceNumber > 0)
1800                 return -ENODEV;
1801
1802         /* create the device */
1803         if (dev_size < sizeof *gspca_dev)
1804                 dev_size = sizeof *gspca_dev;
1805         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1806         if (gspca_dev == NULL) {
1807                 err("couldn't kzalloc gspca struct");
1808                 return -EIO;
1809         }
1810         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1811         if (!gspca_dev->usb_buf) {
1812                 err("out of memory");
1813                 ret = -EIO;
1814                 goto out;
1815         }
1816         gspca_dev->dev = dev;
1817         gspca_dev->iface = interface->bInterfaceNumber;
1818         gspca_dev->nbalt = intf->num_altsetting;
1819         gspca_dev->sd_desc = sd_desc;
1820 /*      gspca_dev->users = 0;                   (done by kzalloc) */
1821         gspca_dev->nbufread = 2;
1822
1823         /* configure the subdriver and initialize the USB device */
1824         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1825         if (ret < 0)
1826                 goto out;
1827         ret = gspca_dev->sd_desc->init(gspca_dev);
1828         if (ret < 0)
1829                 goto out;
1830         ret = gspca_set_alt0(gspca_dev);
1831         if (ret < 0)
1832                 goto out;
1833         gspca_set_default_mode(gspca_dev);
1834
1835         mutex_init(&gspca_dev->usb_lock);
1836         mutex_init(&gspca_dev->read_lock);
1837         mutex_init(&gspca_dev->queue_lock);
1838         init_waitqueue_head(&gspca_dev->wq);
1839
1840         /* init video stuff */
1841         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1842         gspca_dev->vdev.parent = &dev->dev;
1843         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1844         gspca_dev->vdev.fops = &gspca_dev->fops;
1845         gspca_dev->fops.owner = module;         /* module protection */
1846         gspca_dev->present = 1;
1847         ret = video_register_device(&gspca_dev->vdev,
1848                                   VFL_TYPE_GRABBER,
1849                                   video_nr);
1850         if (ret < 0) {
1851                 err("video_register_device err %d", ret);
1852                 goto out;
1853         }
1854
1855         usb_set_intfdata(intf, gspca_dev);
1856         PDEBUG(D_PROBE, "probe ok");
1857         return 0;
1858 out:
1859         kfree(gspca_dev->usb_buf);
1860         kfree(gspca_dev);
1861         return ret;
1862 }
1863 EXPORT_SYMBOL(gspca_dev_probe);
1864
1865 /*
1866  * USB disconnection
1867  *
1868  * This function must be called by the sub-driver
1869  * when the device disconnects, after the specific resources are freed.
1870  */
1871 void gspca_disconnect(struct usb_interface *intf)
1872 {
1873         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1874
1875         if (!gspca_dev)
1876                 return;
1877         gspca_dev->present = 0;
1878         mutex_lock(&gspca_dev->queue_lock);
1879         mutex_lock(&gspca_dev->usb_lock);
1880         gspca_dev->streaming = 0;
1881         destroy_urbs(gspca_dev);
1882         mutex_unlock(&gspca_dev->usb_lock);
1883         mutex_unlock(&gspca_dev->queue_lock);
1884         while (gspca_dev->users != 0) {         /* wait until fully closed */
1885                 atomic_inc(&gspca_dev->nevent);
1886                 wake_up_interruptible(&gspca_dev->wq);  /* wake processes */
1887                 schedule();
1888         }
1889 /* We don't want people trying to open up the device */
1890         video_unregister_device(&gspca_dev->vdev);
1891 /* Free the memory */
1892         kfree(gspca_dev->usb_buf);
1893         kfree(gspca_dev);
1894         PDEBUG(D_PROBE, "disconnect complete");
1895 }
1896 EXPORT_SYMBOL(gspca_disconnect);
1897
1898 #ifdef CONFIG_PM
1899 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1900 {
1901         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1902
1903         if (!gspca_dev->streaming)
1904                 return 0;
1905         gspca_dev->frozen = 1;          /* avoid urb error messages */
1906         if (gspca_dev->sd_desc->stopN)
1907                 gspca_dev->sd_desc->stopN(gspca_dev);
1908         destroy_urbs(gspca_dev);
1909         gspca_set_alt0(gspca_dev);
1910         if (gspca_dev->sd_desc->stop0)
1911                 gspca_dev->sd_desc->stop0(gspca_dev);
1912         return 0;
1913 }
1914 EXPORT_SYMBOL(gspca_suspend);
1915
1916 int gspca_resume(struct usb_interface *intf)
1917 {
1918         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1919
1920         gspca_dev->frozen = 0;
1921         gspca_dev->sd_desc->init(gspca_dev);
1922         if (gspca_dev->streaming)
1923                 return gspca_init_transfer(gspca_dev);
1924         return 0;
1925 }
1926 EXPORT_SYMBOL(gspca_resume);
1927 #endif
1928 /* -- cam driver utility functions -- */
1929
1930 /* auto gain and exposure algorithm based on the knee algorithm described here:
1931    http://ytse.tricolour.net/docs/LowLightOptimization.html
1932
1933    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1934    where changed. */
1935 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1936         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1937 {
1938         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1939         const struct ctrl *gain_ctrl = NULL;
1940         const struct ctrl *exposure_ctrl = NULL;
1941         const struct ctrl *autogain_ctrl = NULL;
1942         int retval = 0;
1943
1944         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1945                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1946                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1947                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1948                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1949                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1950                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1951         }
1952         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1953                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1954                         "on cam without (auto)gain/exposure");
1955                 return 0;
1956         }
1957
1958         if (gain_ctrl->get(gspca_dev, &gain) ||
1959                         exposure_ctrl->get(gspca_dev, &exposure) ||
1960                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1961                 return 0;
1962
1963         orig_gain = gain;
1964         orig_exposure = exposure;
1965
1966         /* If we are of a multiple of deadzone, do multiple steps to reach the
1967            desired lumination fast (with the risc of a slight overshoot) */
1968         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1969
1970         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1971                 avg_lum, desired_avg_lum, steps);
1972
1973         for (i = 0; i < steps; i++) {
1974                 if (avg_lum > desired_avg_lum) {
1975                         if (gain > gain_knee)
1976                                 gain--;
1977                         else if (exposure > exposure_knee)
1978                                 exposure--;
1979                         else if (gain > gain_ctrl->qctrl.default_value)
1980                                 gain--;
1981                         else if (exposure > exposure_ctrl->qctrl.minimum)
1982                                 exposure--;
1983                         else if (gain > gain_ctrl->qctrl.minimum)
1984                                 gain--;
1985                         else
1986                                 break;
1987                 } else {
1988                         if (gain < gain_ctrl->qctrl.default_value)
1989                                 gain++;
1990                         else if (exposure < exposure_knee)
1991                                 exposure++;
1992                         else if (gain < gain_knee)
1993                                 gain++;
1994                         else if (exposure < exposure_ctrl->qctrl.maximum)
1995                                 exposure++;
1996                         else if (gain < gain_ctrl->qctrl.maximum)
1997                                 gain++;
1998                         else
1999                                 break;
2000                 }
2001         }
2002
2003         if (gain != orig_gain) {
2004                 gain_ctrl->set(gspca_dev, gain);
2005                 retval = 1;
2006         }
2007         if (exposure != orig_exposure) {
2008                 exposure_ctrl->set(gspca_dev, exposure);
2009                 retval = 1;
2010         }
2011
2012         return retval;
2013 }
2014 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2015
2016 /* -- module insert / remove -- */
2017 static int __init gspca_init(void)
2018 {
2019         info("main v%d.%d.%d registered",
2020                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2021                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2022                 DRIVER_VERSION_NUMBER & 0xff);
2023         return 0;
2024 }
2025 static void __exit gspca_exit(void)
2026 {
2027         info("main deregistered");
2028 }
2029
2030 module_init(gspca_init);
2031 module_exit(gspca_exit);
2032
2033 #ifdef GSPCA_DEBUG
2034 module_param_named(debug, gspca_debug, int, 0644);
2035 MODULE_PARM_DESC(debug,
2036                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2037                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2038                 " 0x0100: v4l2");
2039 #endif