drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/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, 5, 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 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 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 #endif
 140                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 141                 return;
 142         }
 143         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 144         for (i = 0; i < urb->number_of_packets; i++) {
 145
 146                 /* check the availability of the frame buffer */
 147                 frame = gspca_get_i_frame(gspca_dev);
 148                 if (!frame) {
 149                         gspca_dev->last_packet_type = DISCARD_PACKET;
 150                         break;
 151                 }
 152
 153                 /* check the packet status and length */
 154                 len = urb->iso_frame_desc[i].actual_length;
 155                 if (len == 0) {
 156                         if (gspca_dev->empty_packet == 0)
 157                                 gspca_dev->empty_packet = 1;
 158                         continue;
 159                 }
 160                 st = urb->iso_frame_desc[i].status;
 161                 if (st) {
 162                         PDEBUG(D_ERR,
 163                                 "ISOC data error: [%d] len=%d, status=%d",
 164                                 i, len, st);
 165                         gspca_dev->last_packet_type = DISCARD_PACKET;
 166                         continue;
 167                 }
 168
 169                 /* let the packet be analyzed by the subdriver */
 170                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 171                         i, urb->iso_frame_desc[i].offset, len);
 172                 data = (u8 *) urb->transfer_buffer
 173                                         + urb->iso_frame_desc[i].offset;
 174                 pkt_scan(gspca_dev, frame, data, len);
 175         }
 176
 177         /* resubmit the URB */
 178         st = usb_submit_urb(urb, GFP_ATOMIC);
 179         if (st < 0)
 180                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 181 }
 182
 183 /*
 184  * ISOC message interrupt from the USB device
 185  *
 186  * Analyse each packet and call the subdriver for copy to the frame buffer.
 187  */
 188 static void isoc_irq(struct urb *urb)
 189 {
 190         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 191
 192         PDEBUG(D_PACK, "isoc irq");
 193         if (!gspca_dev->streaming)
 194                 return;
 195         fill_frame(gspca_dev, urb);
 196 }
 197
 198 /*
 199  * bulk message interrupt from the USB device
 200  */
 201 static void bulk_irq(struct urb *urb)
 202 {
 203         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 204         struct gspca_frame *frame;
 205         int st;
 206
 207         PDEBUG(D_PACK, "bulk irq");
 208         if (!gspca_dev->streaming)
 209                 return;
 210         switch (urb->status) {
 211         case 0:
 212                 break;
 213         case -ESHUTDOWN:
 214                 return;         /* disconnection */
 215         case -ECONNRESET:
 216                 urb->status = 0;
 217                 break;
 218         default:
 219 #ifdef CONFIG_PM
 220                 if (!gspca_dev->frozen)
 221 #endif
 222                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 223                 return;
 224         }
 225
 226         /* check the availability of the frame buffer */
 227         frame = gspca_get_i_frame(gspca_dev);
 228         if (!frame) {
 229                 gspca_dev->last_packet_type = DISCARD_PACKET;
 230         } else {
 231                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 232                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 233                                         frame,
 234                                         urb->transfer_buffer,
 235                                         urb->actual_length);
 236         }
 237
 238         /* resubmit the URB */
 239         if (gspca_dev->cam.bulk_nurbs != 0) {
 240                 st = usb_submit_urb(urb, GFP_ATOMIC);
 241                 if (st < 0)
 242                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 243         }
 244 }
 245
 246 /*
 247  * add data to the current frame
 248  *
 249  * This function is called by the subdrivers at interrupt level.
 250  *
 251  * To build a frame, these ones must add
 252  *      - one FIRST_PACKET
 253  *      - 0 or many INTER_PACKETs
 254  *      - one LAST_PACKET
 255  * DISCARD_PACKET invalidates the whole frame.
 256  * On LAST_PACKET, a new frame is returned.
 257  */
 258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 259                                     enum gspca_packet_type packet_type,
 260                                     struct gspca_frame *frame,
 261                                     const __u8 *data,
 262                                     int len)
 263 {
 264         int i, j;
 265
 266         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 267
 268         /* when start of a new frame, if the current frame buffer
 269          * is not queued, discard the whole frame */
 270         if (packet_type == FIRST_PACKET) {
 271                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 272                                                 != V4L2_BUF_FLAG_QUEUED) {
 273                         gspca_dev->last_packet_type = DISCARD_PACKET;
 274                         return frame;
 275                 }
 276                 frame->data_end = frame->data;
 277                 jiffies_to_timeval(get_jiffies_64(),
 278                                    &frame->v4l2_buf.timestamp);
 279                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 280         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 281                 if (packet_type == LAST_PACKET)
 282                         gspca_dev->last_packet_type = packet_type;
 283                 return frame;
 284         }
 285
 286         /* append the packet to the frame buffer */
 287         if (len > 0) {
 288                 if (frame->data_end - frame->data + len
 289                                                  > frame->v4l2_buf.length) {
 290                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 291                                 frame->data_end - frame->data + len,
 292                                 frame->v4l2_buf.length);
 293                         packet_type = DISCARD_PACKET;
 294                 } else {
 295                         memcpy(frame->data_end, data, len);
 296                         frame->data_end += len;
 297                 }
 298         }
 299         gspca_dev->last_packet_type = packet_type;
 300
 301         /* if last packet, wake up the application and advance in the queue */
 302         if (packet_type == LAST_PACKET) {
 303                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 304                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 305                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 306                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 307                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 308                 gspca_dev->fr_i = i;
 309                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 310                         frame->v4l2_buf.bytesused,
 311                         gspca_dev->fr_q,
 312                         i,
 313                         gspca_dev->fr_o);
 314                 j = gspca_dev->fr_queue[i];
 315                 frame = &gspca_dev->frame[j];
 316         }
 317         return frame;
 318 }
 319 EXPORT_SYMBOL(gspca_frame_add);
 320
 321 static int gspca_is_compressed(__u32 format)
 322 {
 323         switch (format) {
 324         case V4L2_PIX_FMT_MJPEG:
 325         case V4L2_PIX_FMT_JPEG:
 326         case V4L2_PIX_FMT_SPCA561:
 327         case V4L2_PIX_FMT_PAC207:
 328         case V4L2_PIX_FMT_MR97310A:
 329                 return 1;
 330         }
 331         return 0;
 332 }
 333
 334 static void *rvmalloc(unsigned long size)
 335 {
 336         void *mem;
 337         unsigned long adr;
 338
 339         mem = vmalloc_32(size);
 340         if (mem != NULL) {
 341                 adr = (unsigned long) mem;
 342                 while ((long) size > 0) {
 343                         SetPageReserved(vmalloc_to_page((void *) adr));
 344                         adr += PAGE_SIZE;
 345                         size -= PAGE_SIZE;
 346                 }
 347         }
 348         return mem;
 349 }
 350
 351 static void rvfree(void *mem, long size)
 352 {
 353         unsigned long adr;
 354
 355         adr = (unsigned long) mem;
 356         while (size > 0) {
 357                 ClearPageReserved(vmalloc_to_page((void *) adr));
 358                 adr += PAGE_SIZE;
 359                 size -= PAGE_SIZE;
 360         }
 361         vfree(mem);
 362 }
 363
 364 static int frame_alloc(struct gspca_dev *gspca_dev,
 365                         unsigned int count)
 366 {
 367         struct gspca_frame *frame;
 368         unsigned int frsz;
 369         int i;
 370
 371         i = gspca_dev->curr_mode;
 372         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 373         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 374         frsz = PAGE_ALIGN(frsz);
 375         gspca_dev->frsz = frsz;
 376         if (count > GSPCA_MAX_FRAMES)
 377                 count = GSPCA_MAX_FRAMES;
 378         gspca_dev->frbuf = rvmalloc(frsz * count);
 379         if (!gspca_dev->frbuf) {
 380                 err("frame alloc failed");
 381                 return -ENOMEM;
 382         }
 383         gspca_dev->nframes = count;
 384         for (i = 0; i < count; i++) {
 385                 frame = &gspca_dev->frame[i];
 386                 frame->v4l2_buf.index = i;
 387                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 388                 frame->v4l2_buf.flags = 0;
 389                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 390                 frame->v4l2_buf.length = frsz;
 391                 frame->v4l2_buf.memory = gspca_dev->memory;
 392                 frame->v4l2_buf.sequence = 0;
 393                 frame->data = frame->data_end =
 394                                         gspca_dev->frbuf + i * frsz;
 395                 frame->v4l2_buf.m.offset = i * frsz;
 396         }
 397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 398         gspca_dev->last_packet_type = DISCARD_PACKET;
 399         gspca_dev->sequence = 0;
 400         return 0;
 401 }
 402
 403 static void frame_free(struct gspca_dev *gspca_dev)
 404 {
 405         int i;
 406
 407         PDEBUG(D_STREAM, "frame free");
 408         if (gspca_dev->frbuf != NULL) {
 409                 rvfree(gspca_dev->frbuf,
 410                         gspca_dev->nframes * gspca_dev->frsz);
 411                 gspca_dev->frbuf = NULL;
 412                 for (i = 0; i < gspca_dev->nframes; i++)
 413                         gspca_dev->frame[i].data = NULL;
 414         }
 415         gspca_dev->nframes = 0;
 416 }
 417
 418 static void destroy_urbs(struct gspca_dev *gspca_dev)
 419 {
 420         struct urb *urb;
 421         unsigned int i;
 422
 423         PDEBUG(D_STREAM, "kill transfer");
 424         for (i = 0; i < MAX_NURBS; i++) {
 425                 urb = gspca_dev->urb[i];
 426                 if (urb == NULL)
 427                         break;
 428
 429                 gspca_dev->urb[i] = NULL;
 430                 usb_kill_urb(urb);
 431                 if (urb->transfer_buffer != NULL)
 432                         usb_buffer_free(gspca_dev->dev,
 433                                         urb->transfer_buffer_length,
 434                                         urb->transfer_buffer,
 435                                         urb->transfer_dma);
 436                 usb_free_urb(urb);
 437         }
 438 }
 439
 440 /*
 441  * look for an input transfer endpoint in an alternate setting
 442  */
 443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 444                                           __u8 xfer)
 445 {
 446         struct usb_host_endpoint *ep;
 447         int i, attr;
 448
 449         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 450                 ep = &alt->endpoint[i];
 451                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 452                 if (attr == xfer)
 453                         return ep;
 454         }
 455         return NULL;
 456 }
 457
 458 /*
 459  * look for an input (isoc or bulk) endpoint
 460  *
 461  * The endpoint is defined by the subdriver.
 462  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 463  * This routine may be called many times when the bandwidth is too small
 464  * (the bandwidth is checked on urb submit).
 465  */
 466 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 467 {
 468         struct usb_interface *intf;
 469         struct usb_host_endpoint *ep;
 470         int i, ret;
 471
 472         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 473         ep = NULL;
 474         i = gspca_dev->alt;                     /* previous alt setting */
 475
 476         /* try isoc */
 477         while (--i >= 0) {
 478                 ep = alt_xfer(&intf->altsetting[i],
 479                                 USB_ENDPOINT_XFER_ISOC);
 480                 if (ep)
 481                         break;
 482         }
 483
 484         /* if no isoc, try bulk (alt 0 only) */
 485         if (ep == NULL) {
 486                 ep = alt_xfer(&intf->altsetting[0],
 487                                 USB_ENDPOINT_XFER_BULK);
 488                 if (ep == NULL) {
 489                         err("no transfer endpoint found");
 490                         return NULL;
 491                 }
 492                 i = 0;
 493                 gspca_dev->bulk = 1;
 494         }
 495         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 496                         i, ep->desc.bEndpointAddress);
 497         if (i > 0) {
 498                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 499                 if (ret < 0) {
 500                         err("set interface err %d", ret);
 501                         return NULL;
 502                 }
 503         }
 504         gspca_dev->alt = i;             /* memorize the current alt setting */
 505         return ep;
 506 }
 507
 508 /*
 509  * create the URBs for image transfer
 510  */
 511 static int create_urbs(struct gspca_dev *gspca_dev,
 512                         struct usb_host_endpoint *ep)
 513 {
 514         struct urb *urb;
 515         int n, nurbs, i, psize, npkt, bsize;
 516
 517         /* calculate the packet size and the number of packets */
 518         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 519
 520         if (!gspca_dev->bulk) {                 /* isoc */
 521
 522                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 523                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 524                 npkt = ISO_MAX_SIZE / psize;
 525                 if (npkt > ISO_MAX_PKT)
 526                         npkt = ISO_MAX_PKT;
 527                 bsize = psize * npkt;
 528                 PDEBUG(D_STREAM,
 529                         "isoc %d pkts size %d = bsize:%d",
 530                         npkt, psize, bsize);
 531                 nurbs = DEF_NURBS;
 532         } else {                                /* bulk */
 533                 npkt = 0;
 534                 bsize = gspca_dev->cam.bulk_size;
 535                 if (bsize == 0)
 536                         bsize = psize;
 537                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 538                 if (gspca_dev->cam.bulk_nurbs != 0)
 539                         nurbs = gspca_dev->cam.bulk_nurbs;
 540                 else
 541                         nurbs = 1;
 542         }
 543
 544         gspca_dev->nurbs = nurbs;
 545         for (n = 0; n < nurbs; n++) {
 546                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 547                 if (!urb) {
 548                         err("usb_alloc_urb failed");
 549                         destroy_urbs(gspca_dev);
 550                         return -ENOMEM;
 551                 }
 552                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 553                                                 bsize,
 554                                                 GFP_KERNEL,
 555                                                 &urb->transfer_dma);
 556
 557                 if (urb->transfer_buffer == NULL) {
 558                         usb_free_urb(urb);
 559                         err("usb_buffer_urb failed");
 560                         destroy_urbs(gspca_dev);
 561                         return -ENOMEM;
 562                 }
 563                 gspca_dev->urb[n] = urb;
 564                 urb->dev = gspca_dev->dev;
 565                 urb->context = gspca_dev;
 566                 urb->transfer_buffer_length = bsize;
 567                 if (npkt != 0) {                /* ISOC */
 568                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 569                                                     ep->desc.bEndpointAddress);
 570                         urb->transfer_flags = URB_ISO_ASAP
 571                                         | URB_NO_TRANSFER_DMA_MAP;
 572                         urb->interval = ep->desc.bInterval;
 573                         urb->complete = isoc_irq;
 574                         urb->number_of_packets = npkt;
 575                         for (i = 0; i < npkt; i++) {
 576                                 urb->iso_frame_desc[i].length = psize;
 577                                 urb->iso_frame_desc[i].offset = psize * i;
 578                         }
 579                 } else {                /* bulk */
 580                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 581                                                 ep->desc.bEndpointAddress),
 582                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 583                         urb->complete = bulk_irq;
 584                 }
 585         }
 586         return 0;
 587 }
 588
 589 /*
 590  * start the USB transfer
 591  */
 592 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 593 {
 594         struct usb_host_endpoint *ep;
 595         int n, ret;
 596
 597         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 598                 return -ERESTARTSYS;
 599
 600         if (!gspca_dev->present) {
 601                 ret = -ENODEV;
 602                 goto out;
 603         }
 604
 605         /* set the higher alternate setting and
 606          * loop until urb submit succeeds */
 607         gspca_dev->alt = gspca_dev->nbalt;
 608         for (;;) {
 609                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 610                 ep = get_ep(gspca_dev);
 611                 if (ep == NULL) {
 612                         ret = -EIO;
 613                         goto out;
 614                 }
 615                 ret = create_urbs(gspca_dev, ep);
 616                 if (ret < 0)
 617                         goto out;
 618
 619                 /* clear the bulk endpoint */
 620                 if (gspca_dev->bulk)
 621                         usb_clear_halt(gspca_dev->dev,
 622                                         gspca_dev->urb[0]->pipe);
 623
 624                 /* start the cam */
 625                 ret = gspca_dev->sd_desc->start(gspca_dev);
 626                 if (ret < 0) {
 627                         destroy_urbs(gspca_dev);
 628                         goto out;
 629                 }
 630                 gspca_dev->streaming = 1;
 631
 632                 /* some bulk transfers are started by the subdriver */
 633                 if (gspca_dev->bulk && gspca_dev->cam.bulk_nurbs == 0)
 634                         break;
 635
 636                 /* submit the URBs */
 637                 for (n = 0; n < gspca_dev->nurbs; n++) {
 638                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 639                         if (ret < 0) {
 640                                 PDEBUG(D_ERR|D_STREAM,
 641                                         "usb_submit_urb [%d] err %d", n, ret);
 642                                 gspca_dev->streaming = 0;
 643                                 destroy_urbs(gspca_dev);
 644                                 if (ret == -ENOSPC) {
 645                                         msleep(20);     /* wait for kill
 646                                                          * complete */
 647                                         break;  /* try the previous alt */
 648                                 }
 649                                 goto out;
 650                         }
 651                 }
 652                 if (ret >= 0)
 653                         break;
 654         }
 655 out:
 656         mutex_unlock(&gspca_dev->usb_lock);
 657         return ret;
 658 }
 659
 660 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 661 {
 662         int ret;
 663
 664         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 665         if (ret < 0)
 666                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 667         return ret;
 668 }
 669
 670 /* Note: both the queue and the usb locks should be held when calling this */
 671 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 672 {
 673         gspca_dev->streaming = 0;
 674         if (gspca_dev->present) {
 675                 if (gspca_dev->sd_desc->stopN)
 676                         gspca_dev->sd_desc->stopN(gspca_dev);
 677                 destroy_urbs(gspca_dev);
 678                 gspca_set_alt0(gspca_dev);
 679         }
 680
 681         /* always call stop0 to free the subdriver's resources */
 682         if (gspca_dev->sd_desc->stop0)
 683                 gspca_dev->sd_desc->stop0(gspca_dev);
 684         PDEBUG(D_STREAM, "stream off OK");
 685 }
 686
 687 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 688 {
 689         int i;
 690
 691         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 692         gspca_dev->curr_mode = i;
 693         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 694         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 695         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 696 }
 697
 698 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 699                         int width, int height)
 700 {
 701         int i;
 702
 703         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 704                 if (width >= gspca_dev->cam.cam_mode[i].width
 705                     && height >= gspca_dev->cam.cam_mode[i].height)
 706                         break;
 707         }
 708         return i;
 709 }
 710
 711 /*
 712  * search a mode with the right pixel format
 713  */
 714 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 715                         int mode,
 716                         int pixfmt)
 717 {
 718         int modeU, modeD;
 719
 720         modeU = modeD = mode;
 721         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 722                 if (--modeD >= 0) {
 723                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 724                                                                 == pixfmt)
 725                                 return modeD;
 726                 }
 727                 if (++modeU < gspca_dev->cam.nmodes) {
 728                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 729                                                                 == pixfmt)
 730                                 return modeU;
 731                 }
 732         }
 733         return -EINVAL;
 734 }
 735
 736 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 737                                 struct v4l2_fmtdesc *fmtdesc)
 738 {
 739         struct gspca_dev *gspca_dev = priv;
 740         int i, j, index;
 741         __u32 fmt_tb[8];
 742
 743         /* give an index to each format */
 744         index = 0;
 745         j = 0;
 746         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 747                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 748                 j = 0;
 749                 for (;;) {
 750                         if (fmt_tb[j] == fmt_tb[index])
 751                                 break;
 752                         j++;
 753                 }
 754                 if (j == index) {
 755                         if (fmtdesc->index == index)
 756                                 break;          /* new format */
 757                         index++;
 758                         if (index >= ARRAY_SIZE(fmt_tb))
 759                                 return -EINVAL;
 760                 }
 761         }
 762         if (i < 0)
 763                 return -EINVAL;         /* no more format */
 764
 765         fmtdesc->pixelformat = fmt_tb[index];
 766         if (gspca_is_compressed(fmt_tb[index]))
 767                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 768         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 769         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 770         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 771         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 772         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 773         fmtdesc->description[4] = '\0';
 774         return 0;
 775 }
 776
 777 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 778                             struct v4l2_format *fmt)
 779 {
 780         struct gspca_dev *gspca_dev = priv;
 781         int mode;
 782
 783         mode = gspca_dev->curr_mode;
 784         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 785                 sizeof fmt->fmt.pix);
 786         return 0;
 787 }
 788
 789 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 790                         struct v4l2_format *fmt)
 791 {
 792         int w, h, mode, mode2;
 793
 794         w = fmt->fmt.pix.width;
 795         h = fmt->fmt.pix.height;
 796
 797 #ifdef GSPCA_DEBUG
 798         if (gspca_debug & D_CONF)
 799                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 800 #endif
 801         /* search the closest mode for width and height */
 802         mode = wxh_to_mode(gspca_dev, w, h);
 803
 804         /* OK if right palette */
 805         if (gspca_dev->cam.cam_mode[mode].pixelformat
 806                                                 != fmt->fmt.pix.pixelformat) {
 807
 808                 /* else, search the closest mode with the same pixel format */
 809                 mode2 = gspca_get_mode(gspca_dev, mode,
 810                                         fmt->fmt.pix.pixelformat);
 811                 if (mode2 >= 0)
 812                         mode = mode2;
 813 /*              else
 814                         ;                * no chance, return this mode */
 815         }
 816         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 817                 sizeof fmt->fmt.pix);
 818         return mode;                    /* used when s_fmt */
 819 }
 820
 821 static int vidioc_try_fmt_vid_cap(struct file *file,
 822                               void *priv,
 823                               struct v4l2_format *fmt)
 824 {
 825         struct gspca_dev *gspca_dev = priv;
 826         int ret;
 827
 828         ret = try_fmt_vid_cap(gspca_dev, fmt);
 829         if (ret < 0)
 830                 return ret;
 831         return 0;
 832 }
 833
 834 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 835                             struct v4l2_format *fmt)
 836 {
 837         struct gspca_dev *gspca_dev = priv;
 838         int ret;
 839
 840         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 841                 return -ERESTARTSYS;
 842
 843         ret = try_fmt_vid_cap(gspca_dev, fmt);
 844         if (ret < 0)
 845                 goto out;
 846
 847         if (gspca_dev->nframes != 0
 848             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 849                 ret = -EINVAL;
 850                 goto out;
 851         }
 852
 853         if (ret == gspca_dev->curr_mode) {
 854                 ret = 0;
 855                 goto out;                       /* same mode */
 856         }
 857
 858         if (gspca_dev->streaming) {
 859                 ret = -EBUSY;
 860                 goto out;
 861         }
 862         gspca_dev->width = fmt->fmt.pix.width;
 863         gspca_dev->height = fmt->fmt.pix.height;
 864         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 865         gspca_dev->curr_mode = ret;
 866
 867         ret = 0;
 868 out:
 869         mutex_unlock(&gspca_dev->queue_lock);
 870         return ret;
 871 }
 872
 873 static void gspca_release(struct video_device *vfd)
 874 {
 875         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
 876
 877         PDEBUG(D_STREAM, "device released");
 878
 879         kfree(gspca_dev->usb_buf);
 880         kfree(gspca_dev);
 881 }
 882
 883 static int dev_open(struct file *file)
 884 {
 885         struct gspca_dev *gspca_dev;
 886         int ret;
 887
 888         PDEBUG(D_STREAM, "%s open", current->comm);
 889         gspca_dev = (struct gspca_dev *) video_devdata(file);
 890         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 891                 return -ERESTARTSYS;
 892         if (!gspca_dev->present) {
 893                 ret = -ENODEV;
 894                 goto out;
 895         }
 896
 897         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 898                 ret = -EBUSY;
 899                 goto out;
 900         }
 901
 902         /* protect the subdriver against rmmod */
 903         if (!try_module_get(gspca_dev->module)) {
 904                 ret = -ENODEV;
 905                 goto out;
 906         }
 907
 908         gspca_dev->users++;
 909
 910         file->private_data = gspca_dev;
 911 #ifdef GSPCA_DEBUG
 912         /* activate the v4l2 debug */
 913         if (gspca_debug & D_V4L2)
 914                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
 915                                         | V4L2_DEBUG_IOCTL_ARG;
 916         else
 917                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
 918                                         | V4L2_DEBUG_IOCTL_ARG);
 919 #endif
 920         ret = 0;
 921 out:
 922         mutex_unlock(&gspca_dev->queue_lock);
 923         if (ret != 0)
 924                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 925         else
 926                 PDEBUG(D_STREAM, "open done");
 927         return ret;
 928 }
 929
 930 static int dev_close(struct file *file)
 931 {
 932         struct gspca_dev *gspca_dev = file->private_data;
 933
 934         PDEBUG(D_STREAM, "%s close", current->comm);
 935         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 936                 return -ERESTARTSYS;
 937         gspca_dev->users--;
 938
 939         /* if the file did the capture, free the streaming resources */
 940         if (gspca_dev->capt_file == file) {
 941                 if (gspca_dev->streaming) {
 942                         mutex_lock(&gspca_dev->usb_lock);
 943                         gspca_stream_off(gspca_dev);
 944                         mutex_unlock(&gspca_dev->usb_lock);
 945                 }
 946                 frame_free(gspca_dev);
 947                 gspca_dev->capt_file = NULL;
 948                 gspca_dev->memory = GSPCA_MEMORY_NO;
 949         }
 950         file->private_data = NULL;
 951         module_put(gspca_dev->module);
 952         mutex_unlock(&gspca_dev->queue_lock);
 953
 954         PDEBUG(D_STREAM, "close done");
 955
 956         return 0;
 957 }
 958
 959 static int vidioc_querycap(struct file *file, void  *priv,
 960                            struct v4l2_capability *cap)
 961 {
 962         struct gspca_dev *gspca_dev = priv;
 963         int ret;
 964
 965         memset(cap, 0, sizeof *cap);
 966
 967         /* protect the access to the usb device */
 968         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 969                 return -ERESTARTSYS;
 970         if (!gspca_dev->present) {
 971                 ret = -ENODEV;
 972                 goto out;
 973         }
 974         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 975         if (gspca_dev->dev->product != NULL) {
 976                 strncpy(cap->card, gspca_dev->dev->product,
 977                         sizeof cap->card);
 978         } else {
 979                 snprintf(cap->card, sizeof cap->card,
 980                         "USB Camera (%04x:%04x)",
 981                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 982                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 983         }
 984         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
 985         cap->version = DRIVER_VERSION_NUMBER;
 986         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 987                           | V4L2_CAP_STREAMING
 988                           | V4L2_CAP_READWRITE;
 989         ret = 0;
 990 out:
 991         mutex_unlock(&gspca_dev->usb_lock);
 992         return ret;
 993 }
 994
 995 static int vidioc_queryctrl(struct file *file, void *priv,
 996                            struct v4l2_queryctrl *q_ctrl)
 997 {
 998         struct gspca_dev *gspca_dev = priv;
 999         int i, ix;
1000         u32 id;
1001
1002         ix = -1;
1003         id = q_ctrl->id;
1004         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1005                 id &= V4L2_CTRL_ID_MASK;
1006                 id++;
1007                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1008                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1009                                 continue;
1010                         if (ix < 0) {
1011                                 ix = i;
1012                                 continue;
1013                         }
1014                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1015                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1016                                 continue;
1017                         ix = i;
1018                 }
1019         }
1020         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1021                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1022                         ix = i;
1023                         break;
1024                 }
1025         }
1026         if (ix < 0)
1027                 return -EINVAL;
1028         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1029                 sizeof *q_ctrl);
1030         if (gspca_dev->ctrl_dis & (1 << ix))
1031                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1032         return 0;
1033 }
1034
1035 static int vidioc_s_ctrl(struct file *file, void *priv,
1036                          struct v4l2_control *ctrl)
1037 {
1038         struct gspca_dev *gspca_dev = priv;
1039         const struct ctrl *ctrls;
1040         int i, ret;
1041
1042         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1043              i < gspca_dev->sd_desc->nctrls;
1044              i++, ctrls++) {
1045                 if (ctrl->id != ctrls->qctrl.id)
1046                         continue;
1047                 if (gspca_dev->ctrl_dis & (1 << i))
1048                         return -EINVAL;
1049                 if (ctrl->value < ctrls->qctrl.minimum
1050                     || ctrl->value > ctrls->qctrl.maximum)
1051                         return -ERANGE;
1052                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1053                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1054                         return -ERESTARTSYS;
1055                 if (gspca_dev->present)
1056                         ret = ctrls->set(gspca_dev, ctrl->value);
1057                 else
1058                         ret = -ENODEV;
1059                 mutex_unlock(&gspca_dev->usb_lock);
1060                 return ret;
1061         }
1062         return -EINVAL;
1063 }
1064
1065 static int vidioc_g_ctrl(struct file *file, void *priv,
1066                          struct v4l2_control *ctrl)
1067 {
1068         struct gspca_dev *gspca_dev = priv;
1069
1070         const struct ctrl *ctrls;
1071         int i, ret;
1072
1073         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1074              i < gspca_dev->sd_desc->nctrls;
1075              i++, ctrls++) {
1076                 if (ctrl->id != ctrls->qctrl.id)
1077                         continue;
1078                 if (gspca_dev->ctrl_dis & (1 << i))
1079                         return -EINVAL;
1080                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1081                         return -ERESTARTSYS;
1082                 if (gspca_dev->present)
1083                         ret = ctrls->get(gspca_dev, &ctrl->value);
1084                 else
1085                         ret = -ENODEV;
1086                 mutex_unlock(&gspca_dev->usb_lock);
1087                 return ret;
1088         }
1089         return -EINVAL;
1090 }
1091
1092 /*fixme: have an audio flag in gspca_dev?*/
1093 static int vidioc_s_audio(struct file *file, void *priv,
1094                          struct v4l2_audio *audio)
1095 {
1096         if (audio->index != 0)
1097                 return -EINVAL;
1098         return 0;
1099 }
1100
1101 static int vidioc_g_audio(struct file *file, void *priv,
1102                          struct v4l2_audio *audio)
1103 {
1104         strcpy(audio->name, "Microphone");
1105         return 0;
1106 }
1107
1108 static int vidioc_enumaudio(struct file *file, void *priv,
1109                          struct v4l2_audio *audio)
1110 {
1111         if (audio->index != 0)
1112                 return -EINVAL;
1113
1114         strcpy(audio->name, "Microphone");
1115         audio->capability = 0;
1116         audio->mode = 0;
1117         return 0;
1118 }
1119
1120 static int vidioc_querymenu(struct file *file, void *priv,
1121                             struct v4l2_querymenu *qmenu)
1122 {
1123         struct gspca_dev *gspca_dev = priv;
1124
1125         if (!gspca_dev->sd_desc->querymenu)
1126                 return -EINVAL;
1127         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1128 }
1129
1130 static int vidioc_enum_input(struct file *file, void *priv,
1131                                 struct v4l2_input *input)
1132 {
1133         struct gspca_dev *gspca_dev = priv;
1134
1135         if (input->index != 0)
1136                 return -EINVAL;
1137         input->type = V4L2_INPUT_TYPE_CAMERA;
1138         strncpy(input->name, gspca_dev->sd_desc->name,
1139                 sizeof input->name);
1140         return 0;
1141 }
1142
1143 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1144 {
1145         *i = 0;
1146         return 0;
1147 }
1148
1149 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1150 {
1151         if (i > 0)
1152                 return -EINVAL;
1153         return (0);
1154 }
1155
1156 static int vidioc_reqbufs(struct file *file, void *priv,
1157                           struct v4l2_requestbuffers *rb)
1158 {
1159         struct gspca_dev *gspca_dev = priv;
1160         int i, ret = 0;
1161
1162         switch (rb->memory) {
1163         case GSPCA_MEMORY_READ:                 /* (internal call) */
1164         case V4L2_MEMORY_MMAP:
1165         case V4L2_MEMORY_USERPTR:
1166                 break;
1167         default:
1168                 return -EINVAL;
1169         }
1170         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1171                 return -ERESTARTSYS;
1172
1173         if (gspca_dev->memory != GSPCA_MEMORY_NO
1174             && gspca_dev->memory != rb->memory) {
1175                 ret = -EBUSY;
1176                 goto out;
1177         }
1178
1179         /* only one file may do the capture */
1180         if (gspca_dev->capt_file != NULL
1181             && gspca_dev->capt_file != file) {
1182                 ret = -EBUSY;
1183                 goto out;
1184         }
1185
1186         /* if allocated, the buffers must not be mapped */
1187         for (i = 0; i < gspca_dev->nframes; i++) {
1188                 if (gspca_dev->frame[i].vma_use_count) {
1189                         ret = -EBUSY;
1190                         goto out;
1191                 }
1192         }
1193
1194         /* stop streaming */
1195         if (gspca_dev->streaming) {
1196                 mutex_lock(&gspca_dev->usb_lock);
1197                 gspca_stream_off(gspca_dev);
1198                 mutex_unlock(&gspca_dev->usb_lock);
1199         }
1200
1201         /* free the previous allocated buffers, if any */
1202         if (gspca_dev->nframes != 0) {
1203                 frame_free(gspca_dev);
1204                 gspca_dev->capt_file = NULL;
1205         }
1206         if (rb->count == 0)                     /* unrequest */
1207                 goto out;
1208         gspca_dev->memory = rb->memory;
1209         ret = frame_alloc(gspca_dev, rb->count);
1210         if (ret == 0) {
1211                 rb->count = gspca_dev->nframes;
1212                 gspca_dev->capt_file = file;
1213         }
1214 out:
1215         mutex_unlock(&gspca_dev->queue_lock);
1216         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1217         return ret;
1218 }
1219
1220 static int vidioc_querybuf(struct file *file, void *priv,
1221                            struct v4l2_buffer *v4l2_buf)
1222 {
1223         struct gspca_dev *gspca_dev = priv;
1224         struct gspca_frame *frame;
1225
1226         if (v4l2_buf->index < 0
1227             || v4l2_buf->index >= gspca_dev->nframes)
1228                 return -EINVAL;
1229
1230         frame = &gspca_dev->frame[v4l2_buf->index];
1231         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1232         return 0;
1233 }
1234
1235 static int vidioc_streamon(struct file *file, void *priv,
1236                            enum v4l2_buf_type buf_type)
1237 {
1238         struct gspca_dev *gspca_dev = priv;
1239         int ret;
1240
1241         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1242                 return -EINVAL;
1243         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1244                 return -ERESTARTSYS;
1245
1246         if (gspca_dev->nframes == 0
1247             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1248                 ret = -EINVAL;
1249                 goto out;
1250         }
1251         if (!gspca_dev->streaming) {
1252                 ret = gspca_init_transfer(gspca_dev);
1253                 if (ret < 0)
1254                         goto out;
1255         }
1256 #ifdef GSPCA_DEBUG
1257         if (gspca_debug & D_STREAM) {
1258                 PDEBUG_MODE("stream on OK",
1259                         gspca_dev->pixfmt,
1260                         gspca_dev->width,
1261                         gspca_dev->height);
1262         }
1263 #endif
1264         ret = 0;
1265 out:
1266         mutex_unlock(&gspca_dev->queue_lock);
1267         return ret;
1268 }
1269
1270 static int vidioc_streamoff(struct file *file, void *priv,
1271                                 enum v4l2_buf_type buf_type)
1272 {
1273         struct gspca_dev *gspca_dev = priv;
1274         int i, ret;
1275
1276         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1277                 return -EINVAL;
1278         if (!gspca_dev->streaming)
1279                 return 0;
1280         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1281                 return -ERESTARTSYS;
1282
1283         /* stop streaming */
1284         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1285                 ret = -ERESTARTSYS;
1286                 goto out;
1287         }
1288         gspca_stream_off(gspca_dev);
1289         mutex_unlock(&gspca_dev->usb_lock);
1290
1291         /* empty the application queues */
1292         for (i = 0; i < gspca_dev->nframes; i++)
1293                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1294         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1295         gspca_dev->last_packet_type = DISCARD_PACKET;
1296         gspca_dev->sequence = 0;
1297         ret = 0;
1298 out:
1299         mutex_unlock(&gspca_dev->queue_lock);
1300         return ret;
1301 }
1302
1303 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1304                         struct v4l2_jpegcompression *jpegcomp)
1305 {
1306         struct gspca_dev *gspca_dev = priv;
1307         int ret;
1308
1309         if (!gspca_dev->sd_desc->get_jcomp)
1310                 return -EINVAL;
1311         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1312                 return -ERESTARTSYS;
1313         if (gspca_dev->present)
1314                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1315         else
1316                 ret = -ENODEV;
1317         mutex_unlock(&gspca_dev->usb_lock);
1318         return ret;
1319 }
1320
1321 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1322                         struct v4l2_jpegcompression *jpegcomp)
1323 {
1324         struct gspca_dev *gspca_dev = priv;
1325         int ret;
1326
1327         if (!gspca_dev->sd_desc->set_jcomp)
1328                 return -EINVAL;
1329         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1330                 return -ERESTARTSYS;
1331         if (gspca_dev->present)
1332                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1333         else
1334                 ret = -ENODEV;
1335         mutex_unlock(&gspca_dev->usb_lock);
1336         return ret;
1337 }
1338
1339 static int vidioc_g_parm(struct file *filp, void *priv,
1340                         struct v4l2_streamparm *parm)
1341 {
1342         struct gspca_dev *gspca_dev = priv;
1343
1344         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1345         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1346
1347         if (gspca_dev->sd_desc->get_streamparm) {
1348                 int ret;
1349
1350                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1351                         return -ERESTARTSYS;
1352                 if (gspca_dev->present)
1353                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1354                                                                  parm);
1355                 else
1356                         ret = -ENODEV;
1357                 mutex_unlock(&gspca_dev->usb_lock);
1358                 return ret;
1359         }
1360
1361         return 0;
1362 }
1363
1364 static int vidioc_s_parm(struct file *filp, void *priv,
1365                         struct v4l2_streamparm *parm)
1366 {
1367         struct gspca_dev *gspca_dev = priv;
1368         int n;
1369
1370         n = parm->parm.capture.readbuffers;
1371         if (n == 0 || n > GSPCA_MAX_FRAMES)
1372                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1373         else
1374                 gspca_dev->nbufread = n;
1375
1376         if (gspca_dev->sd_desc->set_streamparm) {
1377                 int ret;
1378
1379                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1380                         return -ERESTARTSYS;
1381                 if (gspca_dev->present)
1382                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1383                                                                  parm);
1384                 else
1385                         ret = -ENODEV;
1386                 mutex_unlock(&gspca_dev->usb_lock);
1387                 return ret;
1388         }
1389
1390         return 0;
1391 }
1392
1393 static int vidioc_s_std(struct file *filp, void *priv,
1394                         v4l2_std_id *parm)
1395 {
1396         return 0;
1397 }
1398
1399 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1400 static int vidiocgmbuf(struct file *file, void *priv,
1401                         struct video_mbuf *mbuf)
1402 {
1403         struct gspca_dev *gspca_dev = file->private_data;
1404         int i;
1405
1406         PDEBUG(D_STREAM, "cgmbuf");
1407         if (gspca_dev->nframes == 0) {
1408                 int ret;
1409
1410                 {
1411                         struct v4l2_format fmt;
1412
1413                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1414                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1415                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1416                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1417                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1418                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1419                         if (ret != 0)
1420                                 return ret;
1421                 }
1422                 {
1423                         struct v4l2_requestbuffers rb;
1424
1425                         memset(&rb, 0, sizeof rb);
1426                         rb.count = 4;
1427                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1428                         rb.memory = V4L2_MEMORY_MMAP;
1429                         ret = vidioc_reqbufs(file, priv, &rb);
1430                         if (ret != 0)
1431                                 return ret;
1432                 }
1433         }
1434         mbuf->frames = gspca_dev->nframes;
1435         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1436         for (i = 0; i < mbuf->frames; i++)
1437                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1438         return 0;
1439 }
1440 #endif
1441
1442 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1443 {
1444         struct gspca_dev *gspca_dev = file->private_data;
1445         struct gspca_frame *frame;
1446         struct page *page;
1447         unsigned long addr, start, size;
1448         int i, ret;
1449
1450         start = vma->vm_start;
1451         size = vma->vm_end - vma->vm_start;
1452         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1453
1454         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1455                 return -ERESTARTSYS;
1456         if (!gspca_dev->present) {
1457                 ret = -ENODEV;
1458                 goto out;
1459         }
1460         if (gspca_dev->capt_file != file) {
1461                 ret = -EINVAL;
1462                 goto out;
1463         }
1464
1465         frame = NULL;
1466         for (i = 0; i < gspca_dev->nframes; ++i) {
1467                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1468                         PDEBUG(D_STREAM, "mmap bad memory type");
1469                         break;
1470                 }
1471                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1472                                                 == vma->vm_pgoff) {
1473                         frame = &gspca_dev->frame[i];
1474                         break;
1475                 }
1476         }
1477         if (frame == NULL) {
1478                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1479                 ret = -EINVAL;
1480                 goto out;
1481         }
1482 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1483         /* v4l1 maps all the buffers */
1484         if (i != 0
1485             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1486 #endif
1487             if (size != frame->v4l2_buf.length) {
1488                 PDEBUG(D_STREAM, "mmap bad size");
1489                 ret = -EINVAL;
1490                 goto out;
1491         }
1492
1493         /*
1494          * - VM_IO marks the area as being a mmaped region for I/O to a
1495          *   device. It also prevents the region from being core dumped.
1496          */
1497         vma->vm_flags |= VM_IO;
1498
1499         addr = (unsigned long) frame->data;
1500         while (size > 0) {
1501                 page = vmalloc_to_page((void *) addr);
1502                 ret = vm_insert_page(vma, start, page);
1503                 if (ret < 0)
1504                         goto out;
1505                 start += PAGE_SIZE;
1506                 addr += PAGE_SIZE;
1507                 size -= PAGE_SIZE;
1508         }
1509
1510         vma->vm_ops = &gspca_vm_ops;
1511         vma->vm_private_data = frame;
1512         gspca_vm_open(vma);
1513         ret = 0;
1514 out:
1515         mutex_unlock(&gspca_dev->queue_lock);
1516         return ret;
1517 }
1518
1519 /*
1520  * wait for a video frame
1521  *
1522  * If a frame is ready, its index is returned.
1523  */
1524 static int frame_wait(struct gspca_dev *gspca_dev,
1525                         int nonblock_ing)
1526 {
1527         struct gspca_frame *frame;
1528         int i, j, ret;
1529
1530         /* check if a frame is ready */
1531         i = gspca_dev->fr_o;
1532         j = gspca_dev->fr_queue[i];
1533         frame = &gspca_dev->frame[j];
1534
1535         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1536                 if (nonblock_ing)
1537                         return -EAGAIN;
1538
1539                 /* wait till a frame is ready */
1540                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1541                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1542                         !gspca_dev->streaming || !gspca_dev->present,
1543                         msecs_to_jiffies(3000));
1544                 if (ret < 0)
1545                         return ret;
1546                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1547                         return -EIO;
1548         }
1549
1550         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1551         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1552                 gspca_dev->fr_q,
1553                 gspca_dev->fr_i,
1554                 gspca_dev->fr_o);
1555
1556         if (gspca_dev->sd_desc->dq_callback) {
1557                 mutex_lock(&gspca_dev->usb_lock);
1558                 if (gspca_dev->present)
1559                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1560                 mutex_unlock(&gspca_dev->usb_lock);
1561         }
1562         return j;
1563 }
1564
1565 /*
1566  * dequeue a video buffer
1567  *
1568  * If nonblock_ing is false, block until a buffer is available.
1569  */
1570 static int vidioc_dqbuf(struct file *file, void *priv,
1571                         struct v4l2_buffer *v4l2_buf)
1572 {
1573         struct gspca_dev *gspca_dev = priv;
1574         struct gspca_frame *frame;
1575         int i, ret;
1576
1577         PDEBUG(D_FRAM, "dqbuf");
1578         if (v4l2_buf->memory != gspca_dev->memory)
1579                 return -EINVAL;
1580
1581         if (!gspca_dev->present)
1582                 return -ENODEV;
1583
1584         /* if not streaming, be sure the application will not loop forever */
1585         if (!(file->f_flags & O_NONBLOCK)
1586             && !gspca_dev->streaming && gspca_dev->users == 1)
1587                 return -EINVAL;
1588
1589         /* only the capturing file may dequeue */
1590         if (gspca_dev->capt_file != file)
1591                 return -EINVAL;
1592
1593         /* only one dequeue / read at a time */
1594         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1595                 return -ERESTARTSYS;
1596
1597         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1598         if (ret < 0)
1599                 goto out;
1600         i = ret;                                /* frame index */
1601         frame = &gspca_dev->frame[i];
1602         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1603                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1604                                  frame->data,
1605                                  frame->v4l2_buf.bytesused)) {
1606                         PDEBUG(D_ERR|D_STREAM,
1607                                 "dqbuf cp to user failed");
1608                         ret = -EFAULT;
1609                         goto out;
1610                 }
1611         }
1612         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1613         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1614         PDEBUG(D_FRAM, "dqbuf %d", i);
1615         ret = 0;
1616 out:
1617         mutex_unlock(&gspca_dev->read_lock);
1618         return ret;
1619 }
1620
1621 /*
1622  * queue a video buffer
1623  *
1624  * Attempting to queue a buffer that has already been
1625  * queued will return -EINVAL.
1626  */
1627 static int vidioc_qbuf(struct file *file, void *priv,
1628                         struct v4l2_buffer *v4l2_buf)
1629 {
1630         struct gspca_dev *gspca_dev = priv;
1631         struct gspca_frame *frame;
1632         int i, index, ret;
1633
1634         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1635
1636         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1637                 return -ERESTARTSYS;
1638
1639         index = v4l2_buf->index;
1640         if ((unsigned) index >= gspca_dev->nframes) {
1641                 PDEBUG(D_FRAM,
1642                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1643                 ret = -EINVAL;
1644                 goto out;
1645         }
1646         if (v4l2_buf->memory != gspca_dev->memory) {
1647                 PDEBUG(D_FRAM, "qbuf bad memory type");
1648                 ret = -EINVAL;
1649                 goto out;
1650         }
1651
1652         frame = &gspca_dev->frame[index];
1653         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1654                 PDEBUG(D_FRAM, "qbuf bad state");
1655                 ret = -EINVAL;
1656                 goto out;
1657         }
1658
1659         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1660
1661         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1662                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1663                 frame->v4l2_buf.length = v4l2_buf->length;
1664         }
1665
1666         /* put the buffer in the 'queued' queue */
1667         i = gspca_dev->fr_q;
1668         gspca_dev->fr_queue[i] = index;
1669         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1670         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1671                 gspca_dev->fr_q,
1672                 gspca_dev->fr_i,
1673                 gspca_dev->fr_o);
1674
1675         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1676         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1677         ret = 0;
1678 out:
1679         mutex_unlock(&gspca_dev->queue_lock);
1680         return ret;
1681 }
1682
1683 /*
1684  * allocate the resources for read()
1685  */
1686 static int read_alloc(struct gspca_dev *gspca_dev,
1687                         struct file *file)
1688 {
1689         struct v4l2_buffer v4l2_buf;
1690         int i, ret;
1691
1692         PDEBUG(D_STREAM, "read alloc");
1693         if (gspca_dev->nframes == 0) {
1694                 struct v4l2_requestbuffers rb;
1695
1696                 memset(&rb, 0, sizeof rb);
1697                 rb.count = gspca_dev->nbufread;
1698                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1699                 rb.memory = GSPCA_MEMORY_READ;
1700                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1701                 if (ret != 0) {
1702                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1703                         return ret;
1704                 }
1705                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1706                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1707                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1708                 for (i = 0; i < gspca_dev->nbufread; i++) {
1709                         v4l2_buf.index = i;
1710                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1711                         if (ret != 0) {
1712                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1713                                 return ret;
1714                         }
1715                 }
1716                 gspca_dev->memory = GSPCA_MEMORY_READ;
1717         }
1718
1719         /* start streaming */
1720         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1721         if (ret != 0)
1722                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1723         return ret;
1724 }
1725
1726 static unsigned int dev_poll(struct file *file, poll_table *wait)
1727 {
1728         struct gspca_dev *gspca_dev = file->private_data;
1729         int i, ret;
1730
1731         PDEBUG(D_FRAM, "poll");
1732
1733         poll_wait(file, &gspca_dev->wq, wait);
1734
1735         /* if reqbufs is not done, the user would use read() */
1736         if (gspca_dev->nframes == 0) {
1737                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1738                         return POLLERR;         /* not the 1st time */
1739                 ret = read_alloc(gspca_dev, file);
1740                 if (ret != 0)
1741                         return POLLERR;
1742         }
1743
1744         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1745                 return POLLERR;
1746
1747         /* check the next incoming buffer */
1748         i = gspca_dev->fr_o;
1749         i = gspca_dev->fr_queue[i];
1750         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1751                 ret = POLLIN | POLLRDNORM;      /* something to read */
1752         else
1753                 ret = 0;
1754         mutex_unlock(&gspca_dev->queue_lock);
1755         if (!gspca_dev->present)
1756                 return POLLHUP;
1757         return ret;
1758 }
1759
1760 static ssize_t dev_read(struct file *file, char __user *data,
1761                     size_t count, loff_t *ppos)
1762 {
1763         struct gspca_dev *gspca_dev = file->private_data;
1764         struct gspca_frame *frame;
1765         struct v4l2_buffer v4l2_buf;
1766         struct timeval timestamp;
1767         int n, ret, ret2;
1768
1769         PDEBUG(D_FRAM, "read (%zd)", count);
1770         if (!gspca_dev->present)
1771                 return -ENODEV;
1772         switch (gspca_dev->memory) {
1773         case GSPCA_MEMORY_NO:                   /* first time */
1774                 ret = read_alloc(gspca_dev, file);
1775                 if (ret != 0)
1776                         return ret;
1777                 break;
1778         case GSPCA_MEMORY_READ:
1779                 if (gspca_dev->capt_file == file)
1780                         break;
1781                 /* fall thru */
1782         default:
1783                 return -EINVAL;
1784         }
1785
1786         /* get a frame */
1787         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1788         timestamp.tv_sec--;
1789         n = 2;
1790         for (;;) {
1791                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1792                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1793                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1794                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1795                 if (ret != 0) {
1796                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1797                         return ret;
1798                 }
1799
1800                 /* if the process slept for more than 1 second,
1801                  * get a newer frame */
1802                 frame = &gspca_dev->frame[v4l2_buf.index];
1803                 if (--n < 0)
1804                         break;                  /* avoid infinite loop */
1805                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1806                         break;
1807                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1808                 if (ret != 0) {
1809                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1810                         return ret;
1811                 }
1812         }
1813
1814         /* copy the frame */
1815         if (count > frame->v4l2_buf.bytesused)
1816                 count = frame->v4l2_buf.bytesused;
1817         ret = copy_to_user(data, frame->data, count);
1818         if (ret != 0) {
1819                 PDEBUG(D_ERR|D_STREAM,
1820                         "read cp to user lack %d / %zd", ret, count);
1821                 ret = -EFAULT;
1822                 goto out;
1823         }
1824         ret = count;
1825 out:
1826         /* in each case, requeue the buffer */
1827         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1828         if (ret2 != 0)
1829                 return ret2;
1830         return ret;
1831 }
1832
1833 static struct v4l2_file_operations dev_fops = {
1834         .owner = THIS_MODULE,
1835         .open = dev_open,
1836         .release = dev_close,
1837         .read = dev_read,
1838         .mmap = dev_mmap,
1839         .unlocked_ioctl = video_ioctl2,
1840         .poll   = dev_poll,
1841 };
1842
1843 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1844         .vidioc_querycap        = vidioc_querycap,
1845         .vidioc_dqbuf           = vidioc_dqbuf,
1846         .vidioc_qbuf            = vidioc_qbuf,
1847         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1848         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1849         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1850         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1851         .vidioc_streamon        = vidioc_streamon,
1852         .vidioc_queryctrl       = vidioc_queryctrl,
1853         .vidioc_g_ctrl          = vidioc_g_ctrl,
1854         .vidioc_s_ctrl          = vidioc_s_ctrl,
1855         .vidioc_g_audio         = vidioc_g_audio,
1856         .vidioc_s_audio         = vidioc_s_audio,
1857         .vidioc_enumaudio       = vidioc_enumaudio,
1858         .vidioc_querymenu       = vidioc_querymenu,
1859         .vidioc_enum_input      = vidioc_enum_input,
1860         .vidioc_g_input         = vidioc_g_input,
1861         .vidioc_s_input         = vidioc_s_input,
1862         .vidioc_reqbufs         = vidioc_reqbufs,
1863         .vidioc_querybuf        = vidioc_querybuf,
1864         .vidioc_streamoff       = vidioc_streamoff,
1865         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1866         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1867         .vidioc_g_parm          = vidioc_g_parm,
1868         .vidioc_s_parm          = vidioc_s_parm,
1869         .vidioc_s_std           = vidioc_s_std,
1870 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1871         .vidiocgmbuf          = vidiocgmbuf,
1872 #endif
1873 };
1874
1875 static struct video_device gspca_template = {
1876         .name = "gspca main driver",
1877         .fops = &dev_fops,
1878         .ioctl_ops = &dev_ioctl_ops,
1879         .release = gspca_release,
1880         .minor = -1,
1881 };
1882
1883 /*
1884  * probe and create a new gspca device
1885  *
1886  * This function must be called by the sub-driver when it is
1887  * called for probing a new device.
1888  */
1889 int gspca_dev_probe(struct usb_interface *intf,
1890                 const struct usb_device_id *id,
1891                 const struct sd_desc *sd_desc,
1892                 int dev_size,
1893                 struct module *module)
1894 {
1895         struct usb_interface_descriptor *interface;
1896         struct gspca_dev *gspca_dev;
1897         struct usb_device *dev = interface_to_usbdev(intf);
1898         int ret;
1899
1900         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1901
1902         /* we don't handle multi-config cameras */
1903         if (dev->descriptor.bNumConfigurations != 1)
1904                 return -ENODEV;
1905         interface = &intf->cur_altsetting->desc;
1906         if (interface->bInterfaceNumber > 0)
1907                 return -ENODEV;
1908
1909         /* create the device */
1910         if (dev_size < sizeof *gspca_dev)
1911                 dev_size = sizeof *gspca_dev;
1912         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1913         if (!gspca_dev) {
1914                 err("couldn't kzalloc gspca struct");
1915                 return -ENOMEM;
1916         }
1917         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1918         if (!gspca_dev->usb_buf) {
1919                 err("out of memory");
1920                 ret = -ENOMEM;
1921                 goto out;
1922         }
1923         gspca_dev->dev = dev;
1924         gspca_dev->iface = interface->bInterfaceNumber;
1925         gspca_dev->nbalt = intf->num_altsetting;
1926         gspca_dev->sd_desc = sd_desc;
1927         gspca_dev->nbufread = 2;
1928         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1929
1930         /* configure the subdriver and initialize the USB device */
1931         ret = sd_desc->config(gspca_dev, id);
1932         if (ret < 0)
1933                 goto out;
1934         ret = sd_desc->init(gspca_dev);
1935         if (ret < 0)
1936                 goto out;
1937         ret = gspca_set_alt0(gspca_dev);
1938         if (ret < 0)
1939                 goto out;
1940         gspca_set_default_mode(gspca_dev);
1941
1942         mutex_init(&gspca_dev->usb_lock);
1943         mutex_init(&gspca_dev->read_lock);
1944         mutex_init(&gspca_dev->queue_lock);
1945         init_waitqueue_head(&gspca_dev->wq);
1946
1947         /* init video stuff */
1948         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1949         gspca_dev->vdev.parent = &dev->dev;
1950         gspca_dev->module = module;
1951         gspca_dev->present = 1;
1952         ret = video_register_device(&gspca_dev->vdev,
1953                                   VFL_TYPE_GRABBER,
1954                                   -1);
1955         if (ret < 0) {
1956                 err("video_register_device err %d", ret);
1957                 goto out;
1958         }
1959
1960         usb_set_intfdata(intf, gspca_dev);
1961         PDEBUG(D_PROBE, "probe ok");
1962         return 0;
1963 out:
1964         kfree(gspca_dev->usb_buf);
1965         kfree(gspca_dev);
1966         return ret;
1967 }
1968 EXPORT_SYMBOL(gspca_dev_probe);
1969
1970 /*
1971  * USB disconnection
1972  *
1973  * This function must be called by the sub-driver
1974  * when the device disconnects, after the specific resources are freed.
1975  */
1976 void gspca_disconnect(struct usb_interface *intf)
1977 {
1978         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1979
1980         mutex_lock(&gspca_dev->usb_lock);
1981         gspca_dev->present = 0;
1982
1983         if (gspca_dev->streaming) {
1984                 destroy_urbs(gspca_dev);
1985                 wake_up_interruptible(&gspca_dev->wq);
1986         }
1987
1988         /* the device is freed at exit of this function */
1989         gspca_dev->dev = NULL;
1990         mutex_unlock(&gspca_dev->usb_lock);
1991
1992         usb_set_intfdata(intf, NULL);
1993
1994         /* release the device */
1995         /* (this will call gspca_release() immediatly or on last close) */
1996         video_unregister_device(&gspca_dev->vdev);
1997
1998         PDEBUG(D_PROBE, "disconnect complete");
1999 }
2000 EXPORT_SYMBOL(gspca_disconnect);
2001
2002 #ifdef CONFIG_PM
2003 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2004 {
2005         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2006
2007         if (!gspca_dev->streaming)
2008                 return 0;
2009         gspca_dev->frozen = 1;          /* avoid urb error messages */
2010         if (gspca_dev->sd_desc->stopN)
2011                 gspca_dev->sd_desc->stopN(gspca_dev);
2012         destroy_urbs(gspca_dev);
2013         gspca_set_alt0(gspca_dev);
2014         if (gspca_dev->sd_desc->stop0)
2015                 gspca_dev->sd_desc->stop0(gspca_dev);
2016         return 0;
2017 }
2018 EXPORT_SYMBOL(gspca_suspend);
2019
2020 int gspca_resume(struct usb_interface *intf)
2021 {
2022         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2023
2024         gspca_dev->frozen = 0;
2025         gspca_dev->sd_desc->init(gspca_dev);
2026         if (gspca_dev->streaming)
2027                 return gspca_init_transfer(gspca_dev);
2028         return 0;
2029 }
2030 EXPORT_SYMBOL(gspca_resume);
2031 #endif
2032 /* -- cam driver utility functions -- */
2033
2034 /* auto gain and exposure algorithm based on the knee algorithm described here:
2035    http://ytse.tricolour.net/docs/LowLightOptimization.html
2036
2037    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2038    where changed. */
2039 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2040         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2041 {
2042         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2043         const struct ctrl *gain_ctrl = NULL;
2044         const struct ctrl *exposure_ctrl = NULL;
2045         const struct ctrl *autogain_ctrl = NULL;
2046         int retval = 0;
2047
2048         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2049                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2050                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2051                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2052                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2053                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2054                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2055         }
2056         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2057                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2058                         "on cam without (auto)gain/exposure");
2059                 return 0;
2060         }
2061
2062         if (gain_ctrl->get(gspca_dev, &gain) ||
2063                         exposure_ctrl->get(gspca_dev, &exposure) ||
2064                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2065                 return 0;
2066
2067         orig_gain = gain;
2068         orig_exposure = exposure;
2069
2070         /* If we are of a multiple of deadzone, do multiple steps to reach the
2071            desired lumination fast (with the risc of a slight overshoot) */
2072         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2073
2074         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2075                 avg_lum, desired_avg_lum, steps);
2076
2077         for (i = 0; i < steps; i++) {
2078                 if (avg_lum > desired_avg_lum) {
2079                         if (gain > gain_knee)
2080                                 gain--;
2081                         else if (exposure > exposure_knee)
2082                                 exposure--;
2083                         else if (gain > gain_ctrl->qctrl.default_value)
2084                                 gain--;
2085                         else if (exposure > exposure_ctrl->qctrl.minimum)
2086                                 exposure--;
2087                         else if (gain > gain_ctrl->qctrl.minimum)
2088                                 gain--;
2089                         else
2090                                 break;
2091                 } else {
2092                         if (gain < gain_ctrl->qctrl.default_value)
2093                                 gain++;
2094                         else if (exposure < exposure_knee)
2095                                 exposure++;
2096                         else if (gain < gain_knee)
2097                                 gain++;
2098                         else if (exposure < exposure_ctrl->qctrl.maximum)
2099                                 exposure++;
2100                         else if (gain < gain_ctrl->qctrl.maximum)
2101                                 gain++;
2102                         else
2103                                 break;
2104                 }
2105         }
2106
2107         if (gain != orig_gain) {
2108                 gain_ctrl->set(gspca_dev, gain);
2109                 retval = 1;
2110         }
2111         if (exposure != orig_exposure) {
2112                 exposure_ctrl->set(gspca_dev, exposure);
2113                 retval = 1;
2114         }
2115
2116         return retval;
2117 }
2118 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2119
2120 /* -- module insert / remove -- */
2121 static int __init gspca_init(void)
2122 {
2123         info("main v%d.%d.%d registered",
2124                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2125                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2126                 DRIVER_VERSION_NUMBER & 0xff);
2127         return 0;
2128 }
2129 static void __exit gspca_exit(void)
2130 {
2131         info("main deregistered");
2132 }
2133
2134 module_init(gspca_init);
2135 module_exit(gspca_exit);
2136
2137 #ifdef GSPCA_DEBUG
2138 module_param_named(debug, gspca_debug, int, 0644);
2139 MODULE_PARM_DESC(debug,
2140                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2141                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2142                 " 0x0100: v4l2");
2143 #endif