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  * 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 <linux/kref.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 2             /* default number of URBs */
  42
  43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  45 MODULE_LICENSE("GPL");
  46
  47 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 3, 0)
  48
  49 static int video_nr = -1;
  50
  51 #ifdef GSPCA_DEBUG
  52 int gspca_debug = D_ERR | D_PROBE;
  53 EXPORT_SYMBOL(gspca_debug);
  54
  55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  56 {
  57         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  58                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  59                         txt,
  60                         pixfmt & 0xff,
  61                         (pixfmt >> 8) & 0xff,
  62                         (pixfmt >> 16) & 0xff,
  63                         pixfmt >> 24,
  64                         w, h);
  65         } else {
  66                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  67                         txt,
  68                         pixfmt,
  69                         w, h);
  70         }
  71 }
  72 #else
  73 #define PDEBUG_MODE(txt, pixfmt, w, h)
  74 #endif
  75
  76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  77 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  78 #define GSPCA_MEMORY_READ 7
  79
  80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  81
  82 /*
  83  * VMA operations.
  84  */
  85 static void gspca_vm_open(struct vm_area_struct *vma)
  86 {
  87         struct gspca_frame *frame = vma->vm_private_data;
  88
  89         frame->vma_use_count++;
  90         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  91 }
  92
  93 static void gspca_vm_close(struct vm_area_struct *vma)
  94 {
  95         struct gspca_frame *frame = vma->vm_private_data;
  96
  97         if (--frame->vma_use_count <= 0)
  98                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  99 }
 100
 101 static struct vm_operations_struct gspca_vm_ops = {
 102         .open           = gspca_vm_open,
 103         .close          = gspca_vm_close,
 104 };
 105
 106 /* get the current input frame buffer */
 107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 108 {
 109         struct gspca_frame *frame;
 110         int i;
 111
 112         i = gspca_dev->fr_i;
 113         i = gspca_dev->fr_queue[i];
 114         frame = &gspca_dev->frame[i];
 115         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 116                                 != V4L2_BUF_FLAG_QUEUED)
 117                 return NULL;
 118         return frame;
 119 }
 120 EXPORT_SYMBOL(gspca_get_i_frame);
 121
 122 /*
 123  * fill a video frame from an URB and resubmit
 124  */
 125 static void fill_frame(struct gspca_dev *gspca_dev,
 126                         struct urb *urb)
 127 {
 128         struct gspca_frame *frame;
 129         __u8 *data;             /* address of data in the iso message */
 130         int i, len, st;
 131         cam_pkt_op pkt_scan;
 132
 133         if (urb->status != 0) {
 134 #ifdef CONFIG_PM
 135                 if (!gspca_dev->frozen)
 136 #endif
 137                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 138                 return;         /* disconnection ? */
 139         }
 140         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 141         for (i = 0; i < urb->number_of_packets; i++) {
 142
 143                 /* check the availability of the frame buffer */
 144                 frame = gspca_get_i_frame(gspca_dev);
 145                 if (!frame) {
 146                         gspca_dev->last_packet_type = DISCARD_PACKET;
 147                         break;
 148                 }
 149
 150                 /* check the packet status and length */
 151                 len = urb->iso_frame_desc[i].actual_length;
 152                 if (len == 0)
 153                         continue;
 154                 st = urb->iso_frame_desc[i].status;
 155                 if (st) {
 156                         PDEBUG(D_ERR,
 157                                 "ISOC data error: [%d] len=%d, status=%d",
 158                                 i, len, st);
 159                         gspca_dev->last_packet_type = DISCARD_PACKET;
 160                         continue;
 161                 }
 162
 163                 /* let the packet be analyzed by the subdriver */
 164                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 165                         i, urb->iso_frame_desc[i].offset, len);
 166                 data = (__u8 *) urb->transfer_buffer
 167                                         + urb->iso_frame_desc[i].offset;
 168                 pkt_scan(gspca_dev, frame, data, len);
 169         }
 170
 171         /* resubmit the URB */
 172         urb->status = 0;
 173         st = usb_submit_urb(urb, GFP_ATOMIC);
 174         if (st < 0)
 175                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 176 }
 177
 178 /*
 179  * ISOC message interrupt from the USB device
 180  *
 181  * Analyse each packet and call the subdriver for copy to the frame buffer.
 182  */
 183 static void isoc_irq(struct urb *urb
 184 )
 185 {
 186         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 187
 188         PDEBUG(D_PACK, "isoc irq");
 189         if (!gspca_dev->streaming)
 190                 return;
 191         fill_frame(gspca_dev, urb);
 192 }
 193
 194 /*
 195  * bulk message interrupt from the USB device
 196  */
 197 static void bulk_irq(struct urb *urb
 198 )
 199 {
 200         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 201         struct gspca_frame *frame;
 202
 203         PDEBUG(D_PACK, "bulk irq");
 204         if (!gspca_dev->streaming)
 205                 return;
 206         if (urb->status != 0 && urb->status != -ECONNRESET) {
 207 #ifdef CONFIG_PM
 208                 if (!gspca_dev->frozen)
 209 #endif
 210                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 211                 return;         /* disconnection ? */
 212         }
 213
 214         /* check the availability of the frame buffer */
 215         frame = gspca_get_i_frame(gspca_dev);
 216         if (!frame) {
 217                 gspca_dev->last_packet_type = DISCARD_PACKET;
 218         } else {
 219                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 220                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 221                                         frame,
 222                                         urb->transfer_buffer,
 223                                         urb->actual_length);
 224         }
 225 }
 226
 227 /*
 228  * add data to the current frame
 229  *
 230  * This function is called by the subdrivers at interrupt level.
 231  *
 232  * To build a frame, these ones must add
 233  *      - one FIRST_PACKET
 234  *      - 0 or many INTER_PACKETs
 235  *      - one LAST_PACKET
 236  * DISCARD_PACKET invalidates the whole frame.
 237  * On LAST_PACKET, a new frame is returned.
 238  */
 239 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 240                                     int packet_type,
 241                                     struct gspca_frame *frame,
 242                                     const __u8 *data,
 243                                     int len)
 244 {
 245         int i, j;
 246
 247         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 248
 249         /* when start of a new frame, if the current frame buffer
 250          * is not queued, discard the whole frame */
 251         if (packet_type == FIRST_PACKET) {
 252                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 253                                                 != V4L2_BUF_FLAG_QUEUED) {
 254                         gspca_dev->last_packet_type = DISCARD_PACKET;
 255                         return frame;
 256                 }
 257                 frame->data_end = frame->data;
 258                 jiffies_to_timeval(get_jiffies_64(),
 259                                    &frame->v4l2_buf.timestamp);
 260                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 261         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 262                 if (packet_type == LAST_PACKET)
 263                         gspca_dev->last_packet_type = packet_type;
 264                 return frame;
 265         }
 266
 267         /* append the packet to the frame buffer */
 268         if (len > 0) {
 269                 if (frame->data_end - frame->data + len
 270                                                  > frame->v4l2_buf.length) {
 271                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 272                                 frame->data_end - frame->data + len,
 273                                 frame->v4l2_buf.length);
 274                         packet_type = DISCARD_PACKET;
 275                 } else {
 276                         memcpy(frame->data_end, data, len);
 277                         frame->data_end += len;
 278                 }
 279         }
 280         gspca_dev->last_packet_type = packet_type;
 281
 282         /* if last packet, wake up the application and advance in the queue */
 283         if (packet_type == LAST_PACKET) {
 284                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 285                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 286                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 287                 atomic_inc(&gspca_dev->nevent);
 288                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 289                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 290                 gspca_dev->fr_i = i;
 291                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 292                         frame->v4l2_buf.bytesused,
 293                         gspca_dev->fr_q,
 294                         i,
 295                         gspca_dev->fr_o);
 296                 j = gspca_dev->fr_queue[i];
 297                 frame = &gspca_dev->frame[j];
 298         }
 299         return frame;
 300 }
 301 EXPORT_SYMBOL(gspca_frame_add);
 302
 303 static int gspca_is_compressed(__u32 format)
 304 {
 305         switch (format) {
 306         case V4L2_PIX_FMT_MJPEG:
 307         case V4L2_PIX_FMT_JPEG:
 308         case V4L2_PIX_FMT_SPCA561:
 309         case V4L2_PIX_FMT_PAC207:
 310                 return 1;
 311         }
 312         return 0;
 313 }
 314
 315 static void *rvmalloc(unsigned long size)
 316 {
 317         void *mem;
 318         unsigned long adr;
 319
 320 /*      size = PAGE_ALIGN(size);        (already done) */
 321         mem = vmalloc_32(size);
 322         if (mem != NULL) {
 323                 adr = (unsigned long) mem;
 324                 while ((long) size > 0) {
 325                         SetPageReserved(vmalloc_to_page((void *) adr));
 326                         adr += PAGE_SIZE;
 327                         size -= PAGE_SIZE;
 328                 }
 329         }
 330         return mem;
 331 }
 332
 333 static void rvfree(void *mem, long size)
 334 {
 335         unsigned long adr;
 336
 337         adr = (unsigned long) mem;
 338         while (size > 0) {
 339                 ClearPageReserved(vmalloc_to_page((void *) adr));
 340                 adr += PAGE_SIZE;
 341                 size -= PAGE_SIZE;
 342         }
 343         vfree(mem);
 344 }
 345
 346 static int frame_alloc(struct gspca_dev *gspca_dev,
 347                         unsigned int count)
 348 {
 349         struct gspca_frame *frame;
 350         unsigned int frsz;
 351         int i;
 352
 353         i = gspca_dev->curr_mode;
 354         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 355         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 356         frsz = PAGE_ALIGN(frsz);
 357         gspca_dev->frsz = frsz;
 358         if (count > GSPCA_MAX_FRAMES)
 359                 count = GSPCA_MAX_FRAMES;
 360         gspca_dev->frbuf = rvmalloc(frsz * count);
 361         if (!gspca_dev->frbuf) {
 362                 err("frame alloc failed");
 363                 return -ENOMEM;
 364         }
 365         gspca_dev->nframes = count;
 366         for (i = 0; i < count; i++) {
 367                 frame = &gspca_dev->frame[i];
 368                 frame->v4l2_buf.index = i;
 369                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 370                 frame->v4l2_buf.flags = 0;
 371                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 372                 frame->v4l2_buf.length = frsz;
 373                 frame->v4l2_buf.memory = gspca_dev->memory;
 374                 frame->v4l2_buf.sequence = 0;
 375                 frame->data = frame->data_end =
 376                                         gspca_dev->frbuf + i * frsz;
 377                 frame->v4l2_buf.m.offset = i * frsz;
 378         }
 379         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 380         gspca_dev->last_packet_type = DISCARD_PACKET;
 381         gspca_dev->sequence = 0;
 382         atomic_set(&gspca_dev->nevent, 0);
 383         return 0;
 384 }
 385
 386 static void frame_free(struct gspca_dev *gspca_dev)
 387 {
 388         int i;
 389
 390         PDEBUG(D_STREAM, "frame free");
 391         if (gspca_dev->frbuf != NULL) {
 392                 rvfree(gspca_dev->frbuf,
 393                         gspca_dev->nframes * gspca_dev->frsz);
 394                 gspca_dev->frbuf = NULL;
 395                 for (i = 0; i < gspca_dev->nframes; i++)
 396                         gspca_dev->frame[i].data = NULL;
 397         }
 398         gspca_dev->nframes = 0;
 399 }
 400
 401 static void destroy_urbs(struct gspca_dev *gspca_dev)
 402 {
 403         struct urb *urb;
 404         unsigned int i;
 405
 406         PDEBUG(D_STREAM, "kill transfer");
 407         for (i = 0; i < MAX_NURBS; ++i) {
 408                 urb = gspca_dev->urb[i];
 409                 if (urb == NULL)
 410                         break;
 411
 412                 gspca_dev->urb[i] = NULL;
 413                 usb_kill_urb(urb);
 414                 if (urb->transfer_buffer != NULL)
 415                         usb_buffer_free(gspca_dev->dev,
 416                                         urb->transfer_buffer_length,
 417                                         urb->transfer_buffer,
 418                                         urb->transfer_dma);
 419                 usb_free_urb(urb);
 420         }
 421 }
 422
 423 /*
 424  * look for an input transfer endpoint in an alternate setting
 425  */
 426 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 427                                           __u8 epaddr,
 428                                           __u8 xfer)
 429 {
 430         struct usb_host_endpoint *ep;
 431         int i, attr;
 432
 433         epaddr |= USB_DIR_IN;
 434         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 435                 ep = &alt->endpoint[i];
 436                 if (ep->desc.bEndpointAddress == epaddr) {
 437                         attr = ep->desc.bmAttributes
 438                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 439                         if (attr == xfer)
 440                                 return ep;
 441                         break;
 442                 }
 443         }
 444         return NULL;
 445 }
 446
 447 /*
 448  * look for an input (isoc or bulk) endpoint
 449  *
 450  * The endpoint is defined by the subdriver.
 451  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 452  * This routine may be called many times when the bandwidth is too small
 453  * (the bandwidth is checked on urb submit).
 454  */
 455 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 456 {
 457         struct usb_interface *intf;
 458         struct usb_host_endpoint *ep;
 459         int i, ret;
 460
 461         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 462         ep = NULL;
 463         i = gspca_dev->alt;                     /* previous alt setting */
 464
 465         /* try isoc */
 466         while (--i > 0) {                       /* alt 0 is unusable */
 467                 ep = alt_xfer(&intf->altsetting[i],
 468                                 gspca_dev->cam.epaddr,
 469                                 USB_ENDPOINT_XFER_ISOC);
 470                 if (ep)
 471                         break;
 472         }
 473
 474         /* if no isoc, try bulk */
 475         if (ep == NULL) {
 476                 ep = alt_xfer(&intf->altsetting[0],
 477                                 gspca_dev->cam.epaddr,
 478                                 USB_ENDPOINT_XFER_BULK);
 479                 if (ep == NULL) {
 480                         err("no transfer endpoint found");
 481                         return NULL;
 482                 }
 483         }
 484         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 485                         i, ep->desc.bEndpointAddress);
 486         if (i > 0) {
 487                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 488                 if (ret < 0) {
 489                         err("set interface err %d", ret);
 490                         return NULL;
 491                 }
 492         }
 493         gspca_dev->alt = i;             /* memorize the current alt setting */
 494         return ep;
 495 }
 496
 497 /*
 498  * create the URBs for image transfer
 499  */
 500 static int create_urbs(struct gspca_dev *gspca_dev,
 501                         struct usb_host_endpoint *ep)
 502 {
 503         struct urb *urb;
 504         int n, nurbs, i, psize, npkt, bsize;
 505
 506         /* calculate the packet size and the number of packets */
 507         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 508
 509         if (gspca_dev->alt != 0) {              /* isoc */
 510
 511                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 512                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 513                 npkt = ISO_MAX_SIZE / psize;
 514                 if (npkt > ISO_MAX_PKT)
 515                         npkt = ISO_MAX_PKT;
 516                 bsize = psize * npkt;
 517                 PDEBUG(D_STREAM,
 518                         "isoc %d pkts size %d = bsize:%d",
 519                         npkt, psize, bsize);
 520                 nurbs = DEF_NURBS;
 521         } else {                                /* bulk */
 522                 npkt = 0;
 523                 bsize = gspca_dev->cam. bulk_size;
 524                 if (bsize == 0)
 525                         bsize = psize;
 526                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 527                 nurbs = 1;
 528         }
 529
 530         gspca_dev->nurbs = nurbs;
 531         for (n = 0; n < nurbs; n++) {
 532                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 533                 if (!urb) {
 534                         err("usb_alloc_urb failed");
 535                         destroy_urbs(gspca_dev);
 536                         return -ENOMEM;
 537                 }
 538                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 539                                                 bsize,
 540                                                 GFP_KERNEL,
 541                                                 &urb->transfer_dma);
 542
 543                 if (urb->transfer_buffer == NULL) {
 544                         usb_free_urb(urb);
 545                         err("usb_buffer_urb failed");
 546                         destroy_urbs(gspca_dev);
 547                         return -ENOMEM;
 548                 }
 549                 gspca_dev->urb[n] = urb;
 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         int n, ret;
 582
 583         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 584                 return -ERESTARTSYS;
 585
 586         /* set the higher alternate setting and
 587          * loop until urb submit succeeds */
 588         gspca_dev->alt = gspca_dev->nbalt;
 589         for (;;) {
 590                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 591                 ep = get_ep(gspca_dev);
 592                 if (ep == NULL) {
 593                         ret = -EIO;
 594                         goto out;
 595                 }
 596                 ret = create_urbs(gspca_dev, ep);
 597                 if (ret < 0)
 598                         goto out;
 599
 600                 /* start the cam */
 601                 ret = gspca_dev->sd_desc->start(gspca_dev);
 602                 if (ret < 0) {
 603                         destroy_urbs(gspca_dev);
 604                         goto out;
 605                 }
 606                 gspca_dev->streaming = 1;
 607                 atomic_set(&gspca_dev->nevent, 0);
 608
 609                 /* bulk transfers are started by the subdriver */
 610                 if (gspca_dev->alt == 0)
 611                         break;
 612
 613                 /* submit the URBs */
 614                 for (n = 0; n < gspca_dev->nurbs; n++) {
 615                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 616                         if (ret < 0) {
 617                                 PDEBUG(D_ERR|D_STREAM,
 618                                         "usb_submit_urb [%d] err %d", n, ret);
 619                                 gspca_dev->streaming = 0;
 620                                 destroy_urbs(gspca_dev);
 621                                 if (ret == -ENOSPC)
 622                                         break;  /* try the previous alt */
 623                                 goto out;
 624                         }
 625                 }
 626                 if (ret >= 0)
 627                         break;
 628         }
 629 out:
 630         mutex_unlock(&gspca_dev->usb_lock);
 631         return ret;
 632 }
 633
 634 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 635 {
 636         int ret;
 637
 638         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 639         if (ret < 0)
 640                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 641         return ret;
 642 }
 643
 644 /* Note: both the queue and the usb locks should be held when calling this */
 645 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 646 {
 647         gspca_dev->streaming = 0;
 648         atomic_set(&gspca_dev->nevent, 0);
 649         if (gspca_dev->present) {
 650                 if (gspca_dev->sd_desc->stopN)
 651                         gspca_dev->sd_desc->stopN(gspca_dev);
 652                 destroy_urbs(gspca_dev);
 653                 gspca_set_alt0(gspca_dev);
 654                 if (gspca_dev->sd_desc->stop0)
 655                         gspca_dev->sd_desc->stop0(gspca_dev);
 656                 PDEBUG(D_STREAM, "stream off OK");
 657         }
 658 }
 659
 660 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 661 {
 662         int i;
 663
 664         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 665         gspca_dev->curr_mode = i;
 666         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 667         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 668         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 669 }
 670
 671 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 672                         int width, int height)
 673 {
 674         int i;
 675
 676         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 677                 if (width >= gspca_dev->cam.cam_mode[i].width
 678                     && height >= gspca_dev->cam.cam_mode[i].height)
 679                         break;
 680         }
 681         return i;
 682 }
 683
 684 /*
 685  * search a mode with the right pixel format
 686  */
 687 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 688                         int mode,
 689                         int pixfmt)
 690 {
 691         int modeU, modeD;
 692
 693         modeU = modeD = mode;
 694         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 695                 if (--modeD >= 0) {
 696                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 697                                                                 == pixfmt)
 698                                 return modeD;
 699                 }
 700                 if (++modeU < gspca_dev->cam.nmodes) {
 701                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 702                                                                 == pixfmt)
 703                                 return modeU;
 704                 }
 705         }
 706         return -EINVAL;
 707 }
 708
 709 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 710                                 struct v4l2_fmtdesc *fmtdesc)
 711 {
 712         struct gspca_dev *gspca_dev = priv;
 713         int i, j, index;
 714         __u32 fmt_tb[8];
 715
 716         /* give an index to each format */
 717         index = 0;
 718         j = 0;
 719         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 720                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 721                 j = 0;
 722                 for (;;) {
 723                         if (fmt_tb[j] == fmt_tb[index])
 724                                 break;
 725                         j++;
 726                 }
 727                 if (j == index) {
 728                         if (fmtdesc->index == index)
 729                                 break;          /* new format */
 730                         index++;
 731                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 732                                 return -EINVAL;
 733                 }
 734         }
 735         if (i < 0)
 736                 return -EINVAL;         /* no more format */
 737
 738         fmtdesc->pixelformat = fmt_tb[index];
 739         if (gspca_is_compressed(fmt_tb[index]))
 740                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 741         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 742         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 743         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 744         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 745         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 746         fmtdesc->description[4] = '\0';
 747         return 0;
 748 }
 749
 750 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 751                             struct v4l2_format *fmt)
 752 {
 753         struct gspca_dev *gspca_dev = priv;
 754         int mode;
 755
 756         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 757                 return -EINVAL;
 758         mode = gspca_dev->curr_mode;
 759         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 760                 sizeof fmt->fmt.pix);
 761         return 0;
 762 }
 763
 764 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 765                         struct v4l2_format *fmt)
 766 {
 767         int w, h, mode, mode2;
 768
 769         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 770                 return -EINVAL;
 771         w = fmt->fmt.pix.width;
 772         h = fmt->fmt.pix.height;
 773
 774 #ifdef GSPCA_DEBUG
 775         if (gspca_debug & D_CONF)
 776                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 777 #endif
 778         /* search the closest mode for width and height */
 779         mode = wxh_to_mode(gspca_dev, w, h);
 780
 781         /* OK if right palette */
 782         if (gspca_dev->cam.cam_mode[mode].pixelformat
 783                                                 != fmt->fmt.pix.pixelformat) {
 784
 785                 /* else, search the closest mode with the same pixel format */
 786                 mode2 = gspca_get_mode(gspca_dev, mode,
 787                                         fmt->fmt.pix.pixelformat);
 788                 if (mode2 >= 0)
 789                         mode = mode2;
 790 /*              else
 791                         ;                * no chance, return this mode */
 792         }
 793         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 794                 sizeof fmt->fmt.pix);
 795         return mode;                    /* used when s_fmt */
 796 }
 797
 798 static int vidioc_try_fmt_vid_cap(struct file *file,
 799                               void *priv,
 800                               struct v4l2_format *fmt)
 801 {
 802         struct gspca_dev *gspca_dev = priv;
 803         int ret;
 804
 805         ret = try_fmt_vid_cap(gspca_dev, fmt);
 806         if (ret < 0)
 807                 return ret;
 808         return 0;
 809 }
 810
 811 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 812                             struct v4l2_format *fmt)
 813 {
 814         struct gspca_dev *gspca_dev = priv;
 815         int ret;
 816
 817         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 818                 return -ERESTARTSYS;
 819
 820         ret = try_fmt_vid_cap(gspca_dev, fmt);
 821         if (ret < 0)
 822                 goto out;
 823
 824         if (gspca_dev->nframes != 0
 825             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 826                 ret = -EINVAL;
 827                 goto out;
 828         }
 829
 830         if (ret == gspca_dev->curr_mode) {
 831                 ret = 0;
 832                 goto out;                       /* same mode */
 833         }
 834
 835         if (gspca_dev->streaming) {
 836                 ret = -EBUSY;
 837                 goto out;
 838         }
 839         gspca_dev->width = fmt->fmt.pix.width;
 840         gspca_dev->height = fmt->fmt.pix.height;
 841         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 842         gspca_dev->curr_mode = ret;
 843
 844         ret = 0;
 845 out:
 846         mutex_unlock(&gspca_dev->queue_lock);
 847         return ret;
 848 }
 849
 850 static void gspca_delete(struct kref *kref)
 851 {
 852         struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
 853
 854         PDEBUG(D_STREAM, "device deleted");
 855
 856         kfree(gspca_dev->usb_buf);
 857         kfree(gspca_dev);
 858 }
 859
 860 static int dev_open(struct inode *inode, struct file *file)
 861 {
 862         struct gspca_dev *gspca_dev;
 863         int ret;
 864
 865         PDEBUG(D_STREAM, "%s open", current->comm);
 866         gspca_dev = (struct gspca_dev *) video_devdata(file);
 867         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 868                 return -ERESTARTSYS;
 869         if (!gspca_dev->present) {
 870                 ret = -ENODEV;
 871                 goto out;
 872         }
 873
 874         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 875                 ret = -EBUSY;
 876                 goto out;
 877         }
 878         gspca_dev->users++;
 879
 880         /* one more user */
 881         kref_get(&gspca_dev->kref);
 882
 883         file->private_data = gspca_dev;
 884 #ifdef GSPCA_DEBUG
 885         /* activate the v4l2 debug */
 886         if (gspca_debug & D_V4L2)
 887                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 888                                         | V4L2_DEBUG_IOCTL_ARG;
 889         else
 890                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 891                                         | V4L2_DEBUG_IOCTL_ARG);
 892 #endif
 893         ret = 0;
 894 out:
 895         mutex_unlock(&gspca_dev->queue_lock);
 896         if (ret != 0)
 897                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 898         else
 899                 PDEBUG(D_STREAM, "open done");
 900         return ret;
 901 }
 902
 903 static int dev_close(struct inode *inode, struct file *file)
 904 {
 905         struct gspca_dev *gspca_dev = file->private_data;
 906
 907         PDEBUG(D_STREAM, "%s close", current->comm);
 908         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 909                 return -ERESTARTSYS;
 910         gspca_dev->users--;
 911
 912         /* if the file did the capture, free the streaming resources */
 913         if (gspca_dev->capt_file == file) {
 914                 if (gspca_dev->streaming) {
 915                         mutex_lock(&gspca_dev->usb_lock);
 916                         gspca_stream_off(gspca_dev);
 917                         mutex_unlock(&gspca_dev->usb_lock);
 918                 }
 919                 frame_free(gspca_dev);
 920                 gspca_dev->capt_file = NULL;
 921                 gspca_dev->memory = GSPCA_MEMORY_NO;
 922         }
 923         file->private_data = NULL;
 924         mutex_unlock(&gspca_dev->queue_lock);
 925
 926         PDEBUG(D_STREAM, "close done");
 927
 928         kref_put(&gspca_dev->kref, gspca_delete);
 929
 930         return 0;
 931 }
 932
 933 static int vidioc_querycap(struct file *file, void  *priv,
 934                            struct v4l2_capability *cap)
 935 {
 936         struct gspca_dev *gspca_dev = priv;
 937
 938         memset(cap, 0, sizeof *cap);
 939         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 940 /*      strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
 941         if (gspca_dev->dev->product != NULL) {
 942                 strncpy(cap->card, gspca_dev->dev->product,
 943                         sizeof cap->card);
 944         } else {
 945                 snprintf(cap->card, sizeof cap->card,
 946                         "USB Camera (%04x:%04x)",
 947                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 948                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 949         }
 950         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 951                 sizeof cap->bus_info);
 952         cap->version = DRIVER_VERSION_NUMBER;
 953         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 954                           | V4L2_CAP_STREAMING
 955                           | V4L2_CAP_READWRITE;
 956         return 0;
 957 }
 958
 959 static int vidioc_queryctrl(struct file *file, void *priv,
 960                            struct v4l2_queryctrl *q_ctrl)
 961 {
 962         struct gspca_dev *gspca_dev = priv;
 963         int i, ix;
 964         u32 id;
 965
 966         ix = -1;
 967         id = q_ctrl->id;
 968         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 969                 id &= V4L2_CTRL_ID_MASK;
 970                 id++;
 971                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 972                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 973                                 continue;
 974                         if (ix < 0) {
 975                                 ix = i;
 976                                 continue;
 977                         }
 978                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 979                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 980                                 continue;
 981                         ix = i;
 982                 }
 983         }
 984         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 985                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 986                         ix = i;
 987                         break;
 988                 }
 989         }
 990         if (ix < 0)
 991                 return -EINVAL;
 992         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 993                 sizeof *q_ctrl);
 994         if (gspca_dev->ctrl_dis & (1 << ix))
 995                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 996         return 0;
 997 }
 998
 999 static int vidioc_s_ctrl(struct file *file, void *priv,
1000                          struct v4l2_control *ctrl)
1001 {
1002         struct gspca_dev *gspca_dev = priv;
1003         const struct ctrl *ctrls;
1004         int i, ret;
1005
1006         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1007              i < gspca_dev->sd_desc->nctrls;
1008              i++, ctrls++) {
1009                 if (ctrl->id != ctrls->qctrl.id)
1010                         continue;
1011                 if (gspca_dev->ctrl_dis & (1 << i))
1012                         return -EINVAL;
1013                 if (ctrl->value < ctrls->qctrl.minimum
1014                     || ctrl->value > ctrls->qctrl.maximum)
1015                         return -ERANGE;
1016                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1017                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1018                         return -ERESTARTSYS;
1019                 ret = ctrls->set(gspca_dev, ctrl->value);
1020                 mutex_unlock(&gspca_dev->usb_lock);
1021                 return ret;
1022         }
1023         return -EINVAL;
1024 }
1025
1026 static int vidioc_g_ctrl(struct file *file, void *priv,
1027                          struct v4l2_control *ctrl)
1028 {
1029         struct gspca_dev *gspca_dev = priv;
1030
1031         const struct ctrl *ctrls;
1032         int i, ret;
1033
1034         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1035              i < gspca_dev->sd_desc->nctrls;
1036              i++, ctrls++) {
1037                 if (ctrl->id != ctrls->qctrl.id)
1038                         continue;
1039                 if (gspca_dev->ctrl_dis & (1 << i))
1040                         return -EINVAL;
1041                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1042                         return -ERESTARTSYS;
1043                 ret = ctrls->get(gspca_dev, &ctrl->value);
1044                 mutex_unlock(&gspca_dev->usb_lock);
1045                 return ret;
1046         }
1047         return -EINVAL;
1048 }
1049
1050 static int vidioc_querymenu(struct file *file, void *priv,
1051                             struct v4l2_querymenu *qmenu)
1052 {
1053         struct gspca_dev *gspca_dev = priv;
1054
1055         if (!gspca_dev->sd_desc->querymenu)
1056                 return -EINVAL;
1057         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1058 }
1059
1060 static int vidioc_enum_input(struct file *file, void *priv,
1061                                 struct v4l2_input *input)
1062 {
1063         struct gspca_dev *gspca_dev = priv;
1064
1065         if (input->index != 0)
1066                 return -EINVAL;
1067         memset(input, 0, sizeof *input);
1068         input->type = V4L2_INPUT_TYPE_CAMERA;
1069         strncpy(input->name, gspca_dev->sd_desc->name,
1070                 sizeof input->name);
1071         return 0;
1072 }
1073
1074 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1075 {
1076         *i = 0;
1077         return 0;
1078 }
1079
1080 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1081 {
1082         if (i > 0)
1083                 return -EINVAL;
1084         return (0);
1085 }
1086
1087 static int vidioc_reqbufs(struct file *file, void *priv,
1088                           struct v4l2_requestbuffers *rb)
1089 {
1090         struct gspca_dev *gspca_dev = priv;
1091         int i, ret = 0;
1092
1093         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1094                 return -EINVAL;
1095         switch (rb->memory) {
1096         case GSPCA_MEMORY_READ:                 /* (internal call) */
1097         case V4L2_MEMORY_MMAP:
1098         case V4L2_MEMORY_USERPTR:
1099                 break;
1100         default:
1101                 return -EINVAL;
1102         }
1103         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1104                 return -ERESTARTSYS;
1105
1106         if (gspca_dev->memory != GSPCA_MEMORY_NO
1107             && gspca_dev->memory != rb->memory) {
1108                 ret = -EBUSY;
1109                 goto out;
1110         }
1111
1112         /* only one file may do the capture */
1113         if (gspca_dev->capt_file != NULL
1114             && gspca_dev->capt_file != file) {
1115                 ret = -EBUSY;
1116                 goto out;
1117         }
1118
1119         /* if allocated, the buffers must not be mapped */
1120         for (i = 0; i < gspca_dev->nframes; i++) {
1121                 if (gspca_dev->frame[i].vma_use_count) {
1122                         ret = -EBUSY;
1123                         goto out;
1124                 }
1125         }
1126
1127         /* stop streaming */
1128         if (gspca_dev->streaming) {
1129                 mutex_lock(&gspca_dev->usb_lock);
1130                 gspca_stream_off(gspca_dev);
1131                 mutex_unlock(&gspca_dev->usb_lock);
1132         }
1133
1134         /* free the previous allocated buffers, if any */
1135         if (gspca_dev->nframes != 0) {
1136                 frame_free(gspca_dev);
1137                 gspca_dev->capt_file = NULL;
1138         }
1139         if (rb->count == 0)                     /* unrequest */
1140                 goto out;
1141         gspca_dev->memory = rb->memory;
1142         ret = frame_alloc(gspca_dev, rb->count);
1143         if (ret == 0) {
1144                 rb->count = gspca_dev->nframes;
1145                 gspca_dev->capt_file = file;
1146         }
1147 out:
1148         mutex_unlock(&gspca_dev->queue_lock);
1149         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1150         return ret;
1151 }
1152
1153 static int vidioc_querybuf(struct file *file, void *priv,
1154                            struct v4l2_buffer *v4l2_buf)
1155 {
1156         struct gspca_dev *gspca_dev = priv;
1157         struct gspca_frame *frame;
1158
1159         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1160             || v4l2_buf->index < 0
1161             || v4l2_buf->index >= gspca_dev->nframes)
1162                 return -EINVAL;
1163
1164         frame = &gspca_dev->frame[v4l2_buf->index];
1165         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1166         return 0;
1167 }
1168
1169 static int vidioc_streamon(struct file *file, void *priv,
1170                            enum v4l2_buf_type buf_type)
1171 {
1172         struct gspca_dev *gspca_dev = priv;
1173         int ret;
1174
1175         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1176                 return -EINVAL;
1177         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1178                 return -ERESTARTSYS;
1179         if (!gspca_dev->present) {
1180                 ret = -ENODEV;
1181                 goto out;
1182         }
1183         if (gspca_dev->nframes == 0) {
1184                 ret = -EINVAL;
1185                 goto out;
1186         }
1187         if (!gspca_dev->streaming) {
1188                 ret = gspca_init_transfer(gspca_dev);
1189                 if (ret < 0)
1190                         goto out;
1191         }
1192 #ifdef GSPCA_DEBUG
1193         if (gspca_debug & D_STREAM) {
1194                 PDEBUG_MODE("stream on OK",
1195                         gspca_dev->pixfmt,
1196                         gspca_dev->width,
1197                         gspca_dev->height);
1198         }
1199 #endif
1200         ret = 0;
1201 out:
1202         mutex_unlock(&gspca_dev->queue_lock);
1203         return ret;
1204 }
1205
1206 static int vidioc_streamoff(struct file *file, void *priv,
1207                                 enum v4l2_buf_type buf_type)
1208 {
1209         struct gspca_dev *gspca_dev = priv;
1210         int i, ret;
1211
1212         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1213                 return -EINVAL;
1214         if (!gspca_dev->streaming)
1215                 return 0;
1216         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1217                 return -ERESTARTSYS;
1218
1219         /* stop streaming */
1220         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1221                 ret = -ERESTARTSYS;
1222                 goto out;
1223         }
1224         gspca_stream_off(gspca_dev);
1225         mutex_unlock(&gspca_dev->usb_lock);
1226
1227         /* empty the application queues */
1228         for (i = 0; i < gspca_dev->nframes; i++)
1229                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1230         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1231         gspca_dev->last_packet_type = DISCARD_PACKET;
1232         gspca_dev->sequence = 0;
1233         atomic_set(&gspca_dev->nevent, 0);
1234         ret = 0;
1235 out:
1236         mutex_unlock(&gspca_dev->queue_lock);
1237         return ret;
1238 }
1239
1240 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1241                         struct v4l2_jpegcompression *jpegcomp)
1242 {
1243         struct gspca_dev *gspca_dev = priv;
1244         int ret;
1245
1246         if (!gspca_dev->sd_desc->get_jcomp)
1247                 return -EINVAL;
1248         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1249                 return -ERESTARTSYS;
1250         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1251         mutex_unlock(&gspca_dev->usb_lock);
1252         return ret;
1253 }
1254
1255 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1256                         struct v4l2_jpegcompression *jpegcomp)
1257 {
1258         struct gspca_dev *gspca_dev = priv;
1259         int ret;
1260
1261         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1262                 return -ERESTARTSYS;
1263         if (!gspca_dev->sd_desc->set_jcomp)
1264                 return -EINVAL;
1265         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1266         mutex_unlock(&gspca_dev->usb_lock);
1267         return ret;
1268 }
1269
1270 static int vidioc_g_parm(struct file *filp, void *priv,
1271                         struct v4l2_streamparm *parm)
1272 {
1273         struct gspca_dev *gspca_dev = priv;
1274
1275         memset(parm, 0, sizeof *parm);
1276         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1277         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1278         return 0;
1279 }
1280
1281 static int vidioc_s_parm(struct file *filp, void *priv,
1282                         struct v4l2_streamparm *parm)
1283 {
1284         struct gspca_dev *gspca_dev = priv;
1285         int n;
1286
1287         n = parm->parm.capture.readbuffers;
1288         if (n == 0 || n > GSPCA_MAX_FRAMES)
1289                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1290         else
1291                 gspca_dev->nbufread = n;
1292         return 0;
1293 }
1294
1295 static int vidioc_s_std(struct file *filp, void *priv,
1296                         v4l2_std_id *parm)
1297 {
1298         return 0;
1299 }
1300
1301 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1302 static int vidiocgmbuf(struct file *file, void *priv,
1303                         struct video_mbuf *mbuf)
1304 {
1305         struct gspca_dev *gspca_dev = file->private_data;
1306         int i;
1307
1308         PDEBUG(D_STREAM, "cgmbuf");
1309         if (gspca_dev->nframes == 0) {
1310                 int ret;
1311
1312                 {
1313                         struct v4l2_format fmt;
1314
1315                         memset(&fmt, 0, sizeof fmt);
1316                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1317                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1318                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1319                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1320                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1321                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1322                         if (ret != 0)
1323                                 return ret;
1324                 }
1325                 {
1326                         struct v4l2_requestbuffers rb;
1327
1328                         memset(&rb, 0, sizeof rb);
1329                         rb.count = 4;
1330                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1331                         rb.memory = V4L2_MEMORY_MMAP;
1332                         ret = vidioc_reqbufs(file, priv, &rb);
1333                         if (ret != 0)
1334                                 return ret;
1335                 }
1336         }
1337         mbuf->frames = gspca_dev->nframes;
1338         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1339         for (i = 0; i < mbuf->frames; i++)
1340                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1341         return 0;
1342 }
1343 #endif
1344
1345 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1346 {
1347         struct gspca_dev *gspca_dev = file->private_data;
1348         struct gspca_frame *frame;
1349         struct page *page;
1350         unsigned long addr, start, size;
1351         int i, ret;
1352
1353         start = vma->vm_start;
1354         size = vma->vm_end - vma->vm_start;
1355         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1356
1357         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1358                 return -ERESTARTSYS;
1359         if (!gspca_dev->present) {
1360                 ret = -ENODEV;
1361                 goto out;
1362         }
1363         if (gspca_dev->capt_file != file) {
1364                 ret = -EINVAL;
1365                 goto out;
1366         }
1367
1368         frame = NULL;
1369         for (i = 0; i < gspca_dev->nframes; ++i) {
1370                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1371                         PDEBUG(D_STREAM, "mmap bad memory type");
1372                         break;
1373                 }
1374                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1375                                                 == vma->vm_pgoff) {
1376                         frame = &gspca_dev->frame[i];
1377                         break;
1378                 }
1379         }
1380         if (frame == NULL) {
1381                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1382                 ret = -EINVAL;
1383                 goto out;
1384         }
1385 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1386         /* v4l1 maps all the buffers */
1387         if (i != 0
1388             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1389 #endif
1390             if (size != frame->v4l2_buf.length) {
1391                 PDEBUG(D_STREAM, "mmap bad size");
1392                 ret = -EINVAL;
1393                 goto out;
1394         }
1395
1396         /*
1397          * - VM_IO marks the area as being a mmaped region for I/O to a
1398          *   device. It also prevents the region from being core dumped.
1399          */
1400         vma->vm_flags |= VM_IO;
1401
1402         addr = (unsigned long) frame->data;
1403         while (size > 0) {
1404                 page = vmalloc_to_page((void *) addr);
1405                 ret = vm_insert_page(vma, start, page);
1406                 if (ret < 0)
1407                         goto out;
1408                 start += PAGE_SIZE;
1409                 addr += PAGE_SIZE;
1410                 size -= PAGE_SIZE;
1411         }
1412
1413         vma->vm_ops = &gspca_vm_ops;
1414         vma->vm_private_data = frame;
1415         gspca_vm_open(vma);
1416         ret = 0;
1417 out:
1418         mutex_unlock(&gspca_dev->queue_lock);
1419         return ret;
1420 }
1421
1422 /*
1423  * wait for a video frame
1424  *
1425  * If a frame is ready, its index is returned.
1426  */
1427 static int frame_wait(struct gspca_dev *gspca_dev,
1428                         int nonblock_ing)
1429 {
1430         struct gspca_frame *frame;
1431         int i, j, ret;
1432
1433         /* check if a frame is ready */
1434         i = gspca_dev->fr_o;
1435         j = gspca_dev->fr_queue[i];
1436         frame = &gspca_dev->frame[j];
1437         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1438                 atomic_dec(&gspca_dev->nevent);
1439                 goto ok;
1440         }
1441         if (nonblock_ing)                       /* no frame yet */
1442                 return -EAGAIN;
1443
1444         /* wait till a frame is ready */
1445         for (;;) {
1446                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1447                                         atomic_read(&gspca_dev->nevent) > 0,
1448                                         msecs_to_jiffies(3000));
1449                 if (ret <= 0) {
1450                         if (ret < 0)
1451                                 return ret;     /* interrupt */
1452                         return -EIO;            /* timeout */
1453                 }
1454                 atomic_dec(&gspca_dev->nevent);
1455                 if (!gspca_dev->streaming || !gspca_dev->present)
1456                         return -EIO;
1457                 i = gspca_dev->fr_o;
1458                 j = gspca_dev->fr_queue[i];
1459                 frame = &gspca_dev->frame[j];
1460                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1461                         break;
1462         }
1463 ok:
1464         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1465         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1466                 gspca_dev->fr_q,
1467                 gspca_dev->fr_i,
1468                 gspca_dev->fr_o);
1469
1470         if (gspca_dev->sd_desc->dq_callback) {
1471                 mutex_lock(&gspca_dev->usb_lock);
1472                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1473                 mutex_unlock(&gspca_dev->usb_lock);
1474         }
1475         return j;
1476 }
1477
1478 /*
1479  * dequeue a video buffer
1480  *
1481  * If nonblock_ing is false, block until a buffer is available.
1482  */
1483 static int vidioc_dqbuf(struct file *file, void *priv,
1484                         struct v4l2_buffer *v4l2_buf)
1485 {
1486         struct gspca_dev *gspca_dev = priv;
1487         struct gspca_frame *frame;
1488         int i, ret;
1489
1490         PDEBUG(D_FRAM, "dqbuf");
1491         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1492                 return -EINVAL;
1493         if (v4l2_buf->memory != gspca_dev->memory)
1494                 return -EINVAL;
1495
1496         /* if not streaming, be sure the application will not loop forever */
1497         if (!(file->f_flags & O_NONBLOCK)
1498             && !gspca_dev->streaming && gspca_dev->users == 1)
1499                 return -EINVAL;
1500
1501         /* only the capturing file may dequeue */
1502         if (gspca_dev->capt_file != file)
1503                 return -EINVAL;
1504
1505         /* only one dequeue / read at a time */
1506         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1507                 return -ERESTARTSYS;
1508
1509         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1510         if (ret < 0)
1511                 goto out;
1512         i = ret;                                /* frame index */
1513         frame = &gspca_dev->frame[i];
1514         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1515                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1516                                  frame->data,
1517                                  frame->v4l2_buf.bytesused)) {
1518                         PDEBUG(D_ERR|D_STREAM,
1519                                 "dqbuf cp to user failed");
1520                         ret = -EFAULT;
1521                         goto out;
1522                 }
1523         }
1524         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1525         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1526         PDEBUG(D_FRAM, "dqbuf %d", i);
1527         ret = 0;
1528 out:
1529         mutex_unlock(&gspca_dev->read_lock);
1530         return ret;
1531 }
1532
1533 /*
1534  * queue a video buffer
1535  *
1536  * Attempting to queue a buffer that has already been
1537  * queued will return -EINVAL.
1538  */
1539 static int vidioc_qbuf(struct file *file, void *priv,
1540                         struct v4l2_buffer *v4l2_buf)
1541 {
1542         struct gspca_dev *gspca_dev = priv;
1543         struct gspca_frame *frame;
1544         int i, index, ret;
1545
1546         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1547         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1548                 return -EINVAL;
1549
1550         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1551                 return -ERESTARTSYS;
1552
1553         index = v4l2_buf->index;
1554         if ((unsigned) index >= gspca_dev->nframes) {
1555                 PDEBUG(D_FRAM,
1556                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1557                 ret = -EINVAL;
1558                 goto out;
1559         }
1560         if (v4l2_buf->memory != gspca_dev->memory) {
1561                 PDEBUG(D_FRAM, "qbuf bad memory type");
1562                 ret = -EINVAL;
1563                 goto out;
1564         }
1565
1566         frame = &gspca_dev->frame[index];
1567         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1568                 PDEBUG(D_FRAM, "qbuf bad state");
1569                 ret = -EINVAL;
1570                 goto out;
1571         }
1572
1573         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1574 /*      frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1575
1576         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1577                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1578                 frame->v4l2_buf.length = v4l2_buf->length;
1579         }
1580
1581         /* put the buffer in the 'queued' queue */
1582         i = gspca_dev->fr_q;
1583         gspca_dev->fr_queue[i] = index;
1584         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1585         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1586                 gspca_dev->fr_q,
1587                 gspca_dev->fr_i,
1588                 gspca_dev->fr_o);
1589
1590         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1591         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1592         ret = 0;
1593 out:
1594         mutex_unlock(&gspca_dev->queue_lock);
1595         return ret;
1596 }
1597
1598 /*
1599  * allocate the resources for read()
1600  */
1601 static int read_alloc(struct gspca_dev *gspca_dev,
1602                         struct file *file)
1603 {
1604         struct v4l2_buffer v4l2_buf;
1605         int i, ret;
1606
1607         PDEBUG(D_STREAM, "read alloc");
1608         if (gspca_dev->nframes == 0) {
1609                 struct v4l2_requestbuffers rb;
1610
1611                 memset(&rb, 0, sizeof rb);
1612                 rb.count = gspca_dev->nbufread;
1613                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1614                 rb.memory = GSPCA_MEMORY_READ;
1615                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1616                 if (ret != 0) {
1617                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1618                         return ret;
1619                 }
1620                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1621                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1622                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1623                 for (i = 0; i < gspca_dev->nbufread; i++) {
1624                         v4l2_buf.index = i;
1625                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1626                         if (ret != 0) {
1627                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1628                                 return ret;
1629                         }
1630                 }
1631                 gspca_dev->memory = GSPCA_MEMORY_READ;
1632         }
1633
1634         /* start streaming */
1635         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1636         if (ret != 0)
1637                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1638         return ret;
1639 }
1640
1641 static unsigned int dev_poll(struct file *file, poll_table *wait)
1642 {
1643         struct gspca_dev *gspca_dev = file->private_data;
1644         int i, ret;
1645
1646         PDEBUG(D_FRAM, "poll");
1647
1648         poll_wait(file, &gspca_dev->wq, wait);
1649         if (!gspca_dev->present)
1650                 return POLLERR;
1651
1652         /* if reqbufs is not done, the user would use read() */
1653         if (gspca_dev->nframes == 0) {
1654                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1655                         return POLLERR;         /* not the 1st time */
1656                 ret = read_alloc(gspca_dev, file);
1657                 if (ret != 0)
1658                         return POLLERR;
1659         }
1660
1661         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1662                 return POLLERR;
1663         if (!gspca_dev->present) {
1664                 ret = POLLERR;
1665                 goto out;
1666         }
1667
1668         /* check the next incoming buffer */
1669         i = gspca_dev->fr_o;
1670         i = gspca_dev->fr_queue[i];
1671         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1672                 ret = POLLIN | POLLRDNORM;      /* something to read */
1673         else
1674                 ret = 0;
1675 out:
1676         mutex_unlock(&gspca_dev->queue_lock);
1677         return ret;
1678 }
1679
1680 static ssize_t dev_read(struct file *file, char __user *data,
1681                     size_t count, loff_t *ppos)
1682 {
1683         struct gspca_dev *gspca_dev = file->private_data;
1684         struct gspca_frame *frame;
1685         struct v4l2_buffer v4l2_buf;
1686         struct timeval timestamp;
1687         int n, ret, ret2;
1688
1689         PDEBUG(D_FRAM, "read (%zd)", count);
1690         if (!gspca_dev->present)
1691                 return -ENODEV;
1692         switch (gspca_dev->memory) {
1693         case GSPCA_MEMORY_NO:                   /* first time */
1694                 ret = read_alloc(gspca_dev, file);
1695                 if (ret != 0)
1696                         return ret;
1697                 break;
1698         case GSPCA_MEMORY_READ:
1699                 if (gspca_dev->capt_file == file)
1700                         break;
1701                 /* fall thru */
1702         default:
1703                 return -EINVAL;
1704         }
1705
1706         /* get a frame */
1707         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1708         timestamp.tv_sec--;
1709         n = 2;
1710         for (;;) {
1711                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1712                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1713                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1714                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1715                 if (ret != 0) {
1716                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1717                         return ret;
1718                 }
1719
1720                 /* if the process slept for more than 1 second,
1721                  * get a newer frame */
1722                 frame = &gspca_dev->frame[v4l2_buf.index];
1723                 if (--n < 0)
1724                         break;                  /* avoid infinite loop */
1725                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1726                         break;
1727                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1728                 if (ret != 0) {
1729                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1730                         return ret;
1731                 }
1732         }
1733
1734         /* copy the frame */
1735         if (count > frame->v4l2_buf.bytesused)
1736                 count = frame->v4l2_buf.bytesused;
1737         ret = copy_to_user(data, frame->data, count);
1738         if (ret != 0) {
1739                 PDEBUG(D_ERR|D_STREAM,
1740                         "read cp to user lack %d / %zd", ret, count);
1741                 ret = -EFAULT;
1742                 goto out;
1743         }
1744         ret = count;
1745 out:
1746         /* in each case, requeue the buffer */
1747         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1748         if (ret2 != 0)
1749                 return ret2;
1750         return ret;
1751 }
1752
1753 static void dev_release(struct video_device *vfd)
1754 {
1755         /* nothing */
1756 }
1757
1758 static struct file_operations dev_fops = {
1759         .owner = THIS_MODULE,
1760         .open = dev_open,
1761         .release = dev_close,
1762         .read = dev_read,
1763         .mmap = dev_mmap,
1764         .ioctl = video_ioctl2,
1765 #ifdef CONFIG_COMPAT
1766         .compat_ioctl = v4l_compat_ioctl32,
1767 #endif
1768         .llseek = no_llseek,
1769         .poll   = dev_poll,
1770 };
1771
1772 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1773         .vidioc_querycap        = vidioc_querycap,
1774         .vidioc_dqbuf           = vidioc_dqbuf,
1775         .vidioc_qbuf            = vidioc_qbuf,
1776         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1777         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1778         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1779         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1780         .vidioc_streamon        = vidioc_streamon,
1781         .vidioc_queryctrl       = vidioc_queryctrl,
1782         .vidioc_g_ctrl          = vidioc_g_ctrl,
1783         .vidioc_s_ctrl          = vidioc_s_ctrl,
1784         .vidioc_querymenu       = vidioc_querymenu,
1785         .vidioc_enum_input      = vidioc_enum_input,
1786         .vidioc_g_input         = vidioc_g_input,
1787         .vidioc_s_input         = vidioc_s_input,
1788         .vidioc_reqbufs         = vidioc_reqbufs,
1789         .vidioc_querybuf        = vidioc_querybuf,
1790         .vidioc_streamoff       = vidioc_streamoff,
1791         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1792         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1793         .vidioc_g_parm          = vidioc_g_parm,
1794         .vidioc_s_parm          = vidioc_s_parm,
1795         .vidioc_s_std           = vidioc_s_std,
1796 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1797         .vidiocgmbuf          = vidiocgmbuf,
1798 #endif
1799 };
1800
1801 static struct video_device gspca_template = {
1802         .name = "gspca main driver",
1803         .fops = &dev_fops,
1804         .ioctl_ops = &dev_ioctl_ops,
1805         .release = dev_release,         /* mandatory */
1806         .minor = -1,
1807 };
1808
1809 /*
1810  * probe and create a new gspca device
1811  *
1812  * This function must be called by the sub-driver when it is
1813  * called for probing a new device.
1814  */
1815 int gspca_dev_probe(struct usb_interface *intf,
1816                 const struct usb_device_id *id,
1817                 const struct sd_desc *sd_desc,
1818                 int dev_size,
1819                 struct module *module)
1820 {
1821         struct usb_interface_descriptor *interface;
1822         struct gspca_dev *gspca_dev;
1823         struct usb_device *dev = interface_to_usbdev(intf);
1824         int ret;
1825
1826         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1827
1828         /* we don't handle multi-config cameras */
1829         if (dev->descriptor.bNumConfigurations != 1)
1830                 return -ENODEV;
1831         interface = &intf->cur_altsetting->desc;
1832         if (interface->bInterfaceNumber > 0)
1833                 return -ENODEV;
1834
1835         /* create the device */
1836         if (dev_size < sizeof *gspca_dev)
1837                 dev_size = sizeof *gspca_dev;
1838         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1839         if (gspca_dev == NULL) {
1840                 err("couldn't kzalloc gspca struct");
1841                 return -EIO;
1842         }
1843         kref_init(&gspca_dev->kref);
1844         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1845         if (!gspca_dev->usb_buf) {
1846                 err("out of memory");
1847                 ret = -EIO;
1848                 goto out;
1849         }
1850         gspca_dev->dev = dev;
1851         gspca_dev->iface = interface->bInterfaceNumber;
1852         gspca_dev->nbalt = intf->num_altsetting;
1853         gspca_dev->sd_desc = sd_desc;
1854 /*      gspca_dev->users = 0;                   (done by kzalloc) */
1855         gspca_dev->nbufread = 2;
1856
1857         /* configure the subdriver and initialize the USB device */
1858         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1859         if (ret < 0)
1860                 goto out;
1861         ret = gspca_dev->sd_desc->init(gspca_dev);
1862         if (ret < 0)
1863                 goto out;
1864         ret = gspca_set_alt0(gspca_dev);
1865         if (ret < 0)
1866                 goto out;
1867         gspca_set_default_mode(gspca_dev);
1868
1869         mutex_init(&gspca_dev->usb_lock);
1870         mutex_init(&gspca_dev->read_lock);
1871         mutex_init(&gspca_dev->queue_lock);
1872         init_waitqueue_head(&gspca_dev->wq);
1873
1874         /* init video stuff */
1875         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1876         gspca_dev->vdev.parent = &dev->dev;
1877         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1878         gspca_dev->vdev.fops = &gspca_dev->fops;
1879         gspca_dev->fops.owner = module;         /* module protection */
1880         gspca_dev->present = 1;
1881         ret = video_register_device(&gspca_dev->vdev,
1882                                   VFL_TYPE_GRABBER,
1883                                   video_nr);
1884         if (ret < 0) {
1885                 err("video_register_device err %d", ret);
1886                 goto out;
1887         }
1888
1889         usb_set_intfdata(intf, gspca_dev);
1890         PDEBUG(D_PROBE, "probe ok");
1891         return 0;
1892 out:
1893         kref_put(&gspca_dev->kref, gspca_delete);
1894         return ret;
1895 }
1896 EXPORT_SYMBOL(gspca_dev_probe);
1897
1898 /*
1899  * USB disconnection
1900  *
1901  * This function must be called by the sub-driver
1902  * when the device disconnects, after the specific resources are freed.
1903  */
1904 void gspca_disconnect(struct usb_interface *intf)
1905 {
1906         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1907
1908         usb_set_intfdata(intf, NULL);
1909
1910         gspca_dev->present = 0;
1911         mutex_lock(&gspca_dev->queue_lock);
1912         mutex_lock(&gspca_dev->usb_lock);
1913         gspca_dev->streaming = 0;
1914         destroy_urbs(gspca_dev);
1915         mutex_unlock(&gspca_dev->usb_lock);
1916         mutex_unlock(&gspca_dev->queue_lock);
1917
1918 /* We don't want people trying to open up the device */
1919         video_unregister_device(&gspca_dev->vdev);
1920
1921         kref_put(&gspca_dev->kref, gspca_delete);
1922
1923         PDEBUG(D_PROBE, "disconnect complete");
1924 }
1925 EXPORT_SYMBOL(gspca_disconnect);
1926
1927 #ifdef CONFIG_PM
1928 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1929 {
1930         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1931
1932         if (!gspca_dev->streaming)
1933                 return 0;
1934         gspca_dev->frozen = 1;          /* avoid urb error messages */
1935         if (gspca_dev->sd_desc->stopN)
1936                 gspca_dev->sd_desc->stopN(gspca_dev);
1937         destroy_urbs(gspca_dev);
1938         gspca_set_alt0(gspca_dev);
1939         if (gspca_dev->sd_desc->stop0)
1940                 gspca_dev->sd_desc->stop0(gspca_dev);
1941         return 0;
1942 }
1943 EXPORT_SYMBOL(gspca_suspend);
1944
1945 int gspca_resume(struct usb_interface *intf)
1946 {
1947         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1948
1949         gspca_dev->frozen = 0;
1950         gspca_dev->sd_desc->init(gspca_dev);
1951         if (gspca_dev->streaming)
1952                 return gspca_init_transfer(gspca_dev);
1953         return 0;
1954 }
1955 EXPORT_SYMBOL(gspca_resume);
1956 #endif
1957 /* -- cam driver utility functions -- */
1958
1959 /* auto gain and exposure algorithm based on the knee algorithm described here:
1960    http://ytse.tricolour.net/docs/LowLightOptimization.html
1961
1962    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1963    where changed. */
1964 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1965         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1966 {
1967         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1968         const struct ctrl *gain_ctrl = NULL;
1969         const struct ctrl *exposure_ctrl = NULL;
1970         const struct ctrl *autogain_ctrl = NULL;
1971         int retval = 0;
1972
1973         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1974                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1975                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1977                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1978                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1979                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1980         }
1981         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1982                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1983                         "on cam without (auto)gain/exposure");
1984                 return 0;
1985         }
1986
1987         if (gain_ctrl->get(gspca_dev, &gain) ||
1988                         exposure_ctrl->get(gspca_dev, &exposure) ||
1989                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1990                 return 0;
1991
1992         orig_gain = gain;
1993         orig_exposure = exposure;
1994
1995         /* If we are of a multiple of deadzone, do multiple steps to reach the
1996            desired lumination fast (with the risc of a slight overshoot) */
1997         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1998
1999         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
2000                 avg_lum, desired_avg_lum, steps);
2001
2002         for (i = 0; i < steps; i++) {
2003                 if (avg_lum > desired_avg_lum) {
2004                         if (gain > gain_knee)
2005                                 gain--;
2006                         else if (exposure > exposure_knee)
2007                                 exposure--;
2008                         else if (gain > gain_ctrl->qctrl.default_value)
2009                                 gain--;
2010                         else if (exposure > exposure_ctrl->qctrl.minimum)
2011                                 exposure--;
2012                         else if (gain > gain_ctrl->qctrl.minimum)
2013                                 gain--;
2014                         else
2015                                 break;
2016                 } else {
2017                         if (gain < gain_ctrl->qctrl.default_value)
2018                                 gain++;
2019                         else if (exposure < exposure_knee)
2020                                 exposure++;
2021                         else if (gain < gain_knee)
2022                                 gain++;
2023                         else if (exposure < exposure_ctrl->qctrl.maximum)
2024                                 exposure++;
2025                         else if (gain < gain_ctrl->qctrl.maximum)
2026                                 gain++;
2027                         else
2028                                 break;
2029                 }
2030         }
2031
2032         if (gain != orig_gain) {
2033                 gain_ctrl->set(gspca_dev, gain);
2034                 retval = 1;
2035         }
2036         if (exposure != orig_exposure) {
2037                 exposure_ctrl->set(gspca_dev, exposure);
2038                 retval = 1;
2039         }
2040
2041         return retval;
2042 }
2043 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2044
2045 /* -- module insert / remove -- */
2046 static int __init gspca_init(void)
2047 {
2048         info("main v%d.%d.%d registered",
2049                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2050                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2051                 DRIVER_VERSION_NUMBER & 0xff);
2052         return 0;
2053 }
2054 static void __exit gspca_exit(void)
2055 {
2056         info("main deregistered");
2057 }
2058
2059 module_init(gspca_init);
2060 module_exit(gspca_exit);
2061
2062 #ifdef GSPCA_DEBUG
2063 module_param_named(debug, gspca_debug, int, 0644);
2064 MODULE_PARM_DESC(debug,
2065                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2066                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2067                 " 0x0100: v4l2");
2068 #endif