drivers/media/video/gspca/gspca.c

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