SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/media/video/gspca/gspca.c

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