git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/fs.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/io.h>
  32 #include <asm/page.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/jiffies.h>
  35 #include <media/v4l2-ioctl.h>
  36
  37 #include "gspca.h"
  38
  39 /* global values */
  40 #define DEF_NURBS 2             /* default number of URBs */
  41
  42 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  43 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  44 MODULE_LICENSE("GPL");
  45
  46 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 3, 0)
  47
  48 static int video_nr = -1;
  49
  50 #ifdef GSPCA_DEBUG
  51 int gspca_debug = D_ERR | D_PROBE;
  52 EXPORT_SYMBOL(gspca_debug);
  53
  54 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  55 {
  56         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  57                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  58                         txt,
  59                         pixfmt & 0xff,
  60                         (pixfmt >> 8) & 0xff,
  61                         (pixfmt >> 16) & 0xff,
  62                         pixfmt >> 24,
  63                         w, h);
  64         } else {
  65                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  66                         txt,
  67                         pixfmt,
  68                         w, h);
  69         }
  70 }
  71 #else
  72 #define PDEBUG_MODE(txt, pixfmt, w, h)
  73 #endif
  74
  75 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  76 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  77 #define GSPCA_MEMORY_READ 7
  78
  79 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  80
  81 /*
  82  * VMA operations.
  83  */
  84 static void gspca_vm_open(struct vm_area_struct *vma)
  85 {
  86         struct gspca_frame *frame = vma->vm_private_data;
  87
  88         frame->vma_use_count++;
  89         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  90 }
  91
  92 static void gspca_vm_close(struct vm_area_struct *vma)
  93 {
  94         struct gspca_frame *frame = vma->vm_private_data;
  95
  96         if (--frame->vma_use_count <= 0)
  97                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  98 }
  99
 100 static struct vm_operations_struct gspca_vm_ops = {
 101         .open           = gspca_vm_open,
 102         .close          = gspca_vm_close,
 103 };
 104
 105 /*
 106  * fill a video frame from an URB and resubmit
 107  */
 108 static void fill_frame(struct gspca_dev *gspca_dev,
 109                         struct urb *urb)
 110 {
 111         struct gspca_frame *frame;
 112         __u8 *data;             /* address of data in the iso message */
 113         int i, j, len, st;
 114         cam_pkt_op pkt_scan;
 115
 116         if (urb->status != 0) {
 117 #ifdef CONFIG_PM
 118                 if (!gspca_dev->frozen)
 119 #endif
 120                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 121                 return;         /* disconnection ? */
 122         }
 123         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 124         for (i = 0; i < urb->number_of_packets; i++) {
 125
 126                 /* check the availability of the frame buffer */
 127                 j = gspca_dev->fr_i;
 128                 j = gspca_dev->fr_queue[j];
 129                 frame = &gspca_dev->frame[j];
 130                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 131                                         != V4L2_BUF_FLAG_QUEUED) {
 132                         gspca_dev->last_packet_type = DISCARD_PACKET;
 133                         break;
 134                 }
 135
 136                 /* check the packet status and length */
 137                 len = urb->iso_frame_desc[i].actual_length;
 138                 if (len == 0)
 139                         continue;
 140                 st = urb->iso_frame_desc[i].status;
 141                 if (st) {
 142                         PDEBUG(D_ERR,
 143                                 "ISOC data error: [%d] len=%d, status=%d",
 144                                 i, len, st);
 145                         gspca_dev->last_packet_type = DISCARD_PACKET;
 146                         continue;
 147                 }
 148
 149                 /* let the packet be analyzed by the subdriver */
 150                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 151                         i, urb->iso_frame_desc[i].offset, len);
 152                 data = (__u8 *) urb->transfer_buffer
 153                                         + urb->iso_frame_desc[i].offset;
 154                 pkt_scan(gspca_dev, frame, data, len);
 155         }
 156
 157         /* resubmit the URB */
 158         urb->status = 0;
 159         st = usb_submit_urb(urb, GFP_ATOMIC);
 160         if (st < 0)
 161                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 162 }
 163
 164 /*
 165  * ISOC message interrupt from the USB device
 166  *
 167  * Analyse each packet and call the subdriver for copy to the frame buffer.
 168  */
 169 static void isoc_irq(struct urb *urb
 170 )
 171 {
 172         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 173
 174         PDEBUG(D_PACK, "isoc irq");
 175         if (!gspca_dev->streaming)
 176                 return;
 177         fill_frame(gspca_dev, urb);
 178 }
 179
 180 /*
 181  * bulk message interrupt from the USB device
 182  */
 183 static void bulk_irq(struct urb *urb
 184 )
 185 {
 186         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 187         struct gspca_frame *frame;
 188         int j;
 189
 190         PDEBUG(D_PACK, "bulk irq");
 191         if (!gspca_dev->streaming)
 192                 return;
 193         if (urb->status != 0 && urb->status != -ECONNRESET) {
 194 #ifdef CONFIG_PM
 195                 if (!gspca_dev->frozen)
 196 #endif
 197                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 198                 return;         /* disconnection ? */
 199         }
 200
 201         /* check the availability of the frame buffer */
 202         j = gspca_dev->fr_i;
 203         j = gspca_dev->fr_queue[j];
 204         frame = &gspca_dev->frame[j];
 205         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 206                                 != V4L2_BUF_FLAG_QUEUED) {
 207                 gspca_dev->last_packet_type = DISCARD_PACKET;
 208         } else {
 209                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 210                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
 211                                         frame,
 212                                         urb->transfer_buffer,
 213                                         urb->actual_length);
 214         }
 215 }
 216
 217 /*
 218  * add data to the current frame
 219  *
 220  * This function is called by the subdrivers at interrupt level.
 221  *
 222  * To build a frame, these ones must add
 223  *      - one FIRST_PACKET
 224  *      - 0 or many INTER_PACKETs
 225  *      - one LAST_PACKET
 226  * DISCARD_PACKET invalidates the whole frame.
 227  * On LAST_PACKET, a new frame is returned.
 228  */
 229 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 230                                     int packet_type,
 231                                     struct gspca_frame *frame,
 232                                     const __u8 *data,
 233                                     int len)
 234 {
 235         int i, j;
 236
 237         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 238
 239         /* when start of a new frame, if the current frame buffer
 240          * is not queued, discard the whole frame */
 241         if (packet_type == FIRST_PACKET) {
 242                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 243                                                 != V4L2_BUF_FLAG_QUEUED) {
 244                         gspca_dev->last_packet_type = DISCARD_PACKET;
 245                         return frame;
 246                 }
 247                 frame->data_end = frame->data;
 248                 jiffies_to_timeval(get_jiffies_64(),
 249                                    &frame->v4l2_buf.timestamp);
 250                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 251         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 252                 if (packet_type == LAST_PACKET)
 253                         gspca_dev->last_packet_type = packet_type;
 254                 return frame;
 255         }
 256
 257         /* append the packet to the frame buffer */
 258         if (len > 0) {
 259                 if (frame->data_end - frame->data + len
 260                                                  > frame->v4l2_buf.length) {
 261                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 262                                 frame->data_end - frame->data + len,
 263                                 frame->v4l2_buf.length);
 264                         packet_type = DISCARD_PACKET;
 265                 } else {
 266                         memcpy(frame->data_end, data, len);
 267                         frame->data_end += len;
 268                 }
 269         }
 270         gspca_dev->last_packet_type = packet_type;
 271
 272         /* if last packet, wake the application and advance in the queue */
 273         if (packet_type == LAST_PACKET) {
 274                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 275                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 276                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 277                 atomic_inc(&gspca_dev->nevent);
 278                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 279                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 280                 gspca_dev->fr_i = i;
 281                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 282                         frame->v4l2_buf.bytesused,
 283                         gspca_dev->fr_q,
 284                         i,
 285                         gspca_dev->fr_o);
 286                 j = gspca_dev->fr_queue[i];
 287                 frame = &gspca_dev->frame[j];
 288         }
 289         return frame;
 290 }
 291 EXPORT_SYMBOL(gspca_frame_add);
 292
 293 static int gspca_is_compressed(__u32 format)
 294 {
 295         switch (format) {
 296         case V4L2_PIX_FMT_MJPEG:
 297         case V4L2_PIX_FMT_JPEG:
 298         case V4L2_PIX_FMT_SPCA561:
 299         case V4L2_PIX_FMT_PAC207:
 300                 return 1;
 301         }
 302         return 0;
 303 }
 304
 305 static void *rvmalloc(unsigned long size)
 306 {
 307         void *mem;
 308         unsigned long adr;
 309
 310 /*      size = PAGE_ALIGN(size);        (already done) */
 311         mem = vmalloc_32(size);
 312         if (mem != NULL) {
 313                 adr = (unsigned long) mem;
 314                 while ((long) size > 0) {
 315                         SetPageReserved(vmalloc_to_page((void *) adr));
 316                         adr += PAGE_SIZE;
 317                         size -= PAGE_SIZE;
 318                 }
 319         }
 320         return mem;
 321 }
 322
 323 static void rvfree(void *mem, long size)
 324 {
 325         unsigned long adr;
 326
 327         adr = (unsigned long) mem;
 328         while (size > 0) {
 329                 ClearPageReserved(vmalloc_to_page((void *) adr));
 330                 adr += PAGE_SIZE;
 331                 size -= PAGE_SIZE;
 332         }
 333         vfree(mem);
 334 }
 335
 336 static int frame_alloc(struct gspca_dev *gspca_dev,
 337                         unsigned int count)
 338 {
 339         struct gspca_frame *frame;
 340         unsigned int frsz;
 341         int i;
 342
 343         i = gspca_dev->curr_mode;
 344         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 345         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 346         frsz = PAGE_ALIGN(frsz);
 347         gspca_dev->frsz = frsz;
 348         if (count > GSPCA_MAX_FRAMES)
 349                 count = GSPCA_MAX_FRAMES;
 350         gspca_dev->frbuf = rvmalloc(frsz * count);
 351         if (!gspca_dev->frbuf) {
 352                 err("frame alloc failed");
 353                 return -ENOMEM;
 354         }
 355         gspca_dev->nframes = count;
 356         for (i = 0; i < count; i++) {
 357                 frame = &gspca_dev->frame[i];
 358                 frame->v4l2_buf.index = i;
 359                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 360                 frame->v4l2_buf.flags = 0;
 361                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 362                 frame->v4l2_buf.length = frsz;
 363                 frame->v4l2_buf.memory = gspca_dev->memory;
 364                 frame->v4l2_buf.sequence = 0;
 365                 frame->data = frame->data_end =
 366                                         gspca_dev->frbuf + i * frsz;
 367                 frame->v4l2_buf.m.offset = i * frsz;
 368         }
 369         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 370         gspca_dev->last_packet_type = DISCARD_PACKET;
 371         gspca_dev->sequence = 0;
 372         atomic_set(&gspca_dev->nevent, 0);
 373         return 0;
 374 }
 375
 376 static void frame_free(struct gspca_dev *gspca_dev)
 377 {
 378         int i;
 379
 380         PDEBUG(D_STREAM, "frame free");
 381         if (gspca_dev->frbuf != NULL) {
 382                 rvfree(gspca_dev->frbuf,
 383                         gspca_dev->nframes * gspca_dev->frsz);
 384                 gspca_dev->frbuf = NULL;
 385                 for (i = 0; i < gspca_dev->nframes; i++)
 386                         gspca_dev->frame[i].data = NULL;
 387         }
 388         gspca_dev->nframes = 0;
 389 }
 390
 391 static void destroy_urbs(struct gspca_dev *gspca_dev)
 392 {
 393         struct urb *urb;
 394         unsigned int i;
 395
 396         PDEBUG(D_STREAM, "kill transfer");
 397         for (i = 0; i < MAX_NURBS; ++i) {
 398                 urb = gspca_dev->urb[i];
 399                 if (urb == NULL)
 400                         break;
 401
 402                 gspca_dev->urb[i] = NULL;
 403                 usb_kill_urb(urb);
 404                 if (urb->transfer_buffer != NULL)
 405                         usb_buffer_free(gspca_dev->dev,
 406                                         urb->transfer_buffer_length,
 407                                         urb->transfer_buffer,
 408                                         urb->transfer_dma);
 409                 usb_free_urb(urb);
 410         }
 411 }
 412
 413 /*
 414  * search an input transfer endpoint in an alternate setting
 415  */
 416 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 417                                           __u8 epaddr,
 418                                           __u8 xfer)
 419 {
 420         struct usb_host_endpoint *ep;
 421         int i, attr;
 422
 423         epaddr |= USB_DIR_IN;
 424         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 425                 ep = &alt->endpoint[i];
 426                 if (ep->desc.bEndpointAddress == epaddr) {
 427                         attr = ep->desc.bmAttributes
 428                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 429                         if (attr == xfer)
 430                                 return ep;
 431                         break;
 432                 }
 433         }
 434         return NULL;
 435 }
 436
 437 /*
 438  * search an input (isoc or bulk) endpoint
 439  *
 440  * The endpoint is defined by the subdriver.
 441  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 442  * This routine may be called many times when the bandwidth is too small
 443  * (the bandwidth is checked on urb submit).
 444  */
 445 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 446 {
 447         struct usb_interface *intf;
 448         struct usb_host_endpoint *ep;
 449         int i, ret;
 450
 451         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 452         ep = NULL;
 453         i = gspca_dev->alt;                     /* previous alt setting */
 454         while (--i > 0) {                       /* alt 0 is unusable */
 455                 ep = alt_xfer(&intf->altsetting[i],
 456                                 gspca_dev->cam.epaddr,
 457                                 gspca_dev->bulk
 458                                         ? USB_ENDPOINT_XFER_BULK
 459                                         : USB_ENDPOINT_XFER_ISOC);
 460                 if (ep)
 461                         break;
 462         }
 463         if (ep == NULL) {
 464                 err("no transfer endpoint found");
 465                 return NULL;
 466         }
 467         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 468                         i, ep->desc.bEndpointAddress);
 469         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 470         if (ret < 0) {
 471                 err("set interface err %d", ret);
 472                 return NULL;
 473         }
 474         gspca_dev->alt = i;             /* memorize the current alt setting */
 475         return ep;
 476 }
 477
 478 /*
 479  * create the URBs for image transfer
 480  */
 481 static int create_urbs(struct gspca_dev *gspca_dev,
 482                         struct usb_host_endpoint *ep)
 483 {
 484         struct urb *urb;
 485         int n, nurbs, i, psize, npkt, bsize;
 486
 487         /* calculate the packet size and the number of packets */
 488         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 489
 490         /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 491         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 492         if (!gspca_dev->bulk) {
 493                 npkt = ISO_MAX_SIZE / psize;
 494                 if (npkt > ISO_MAX_PKT)
 495                         npkt = ISO_MAX_PKT;
 496                 bsize = psize * npkt;
 497                 PDEBUG(D_STREAM,
 498                         "isoc %d pkts size %d = bsize:%d",
 499                         npkt, psize, bsize);
 500                 nurbs = DEF_NURBS;
 501         } else {
 502                 npkt = 0;
 503                 bsize = psize;
 504                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 505                 nurbs = 1;
 506         }
 507
 508         gspca_dev->nurbs = nurbs;
 509         for (n = 0; n < nurbs; n++) {
 510                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 511                 if (!urb) {
 512                         err("usb_alloc_urb failed");
 513                         destroy_urbs(gspca_dev);
 514                         return -ENOMEM;
 515                 }
 516                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 517                                                 bsize,
 518                                                 GFP_KERNEL,
 519                                                 &urb->transfer_dma);
 520
 521                 if (urb->transfer_buffer == NULL) {
 522                         usb_free_urb(urb);
 523                         err("usb_buffer_urb failed");
 524                         destroy_urbs(gspca_dev);
 525                         return -ENOMEM;
 526                 }
 527                 gspca_dev->urb[n] = urb;
 528                 urb->dev = gspca_dev->dev;
 529                 urb->context = gspca_dev;
 530                 urb->transfer_buffer_length = bsize;
 531                 if (npkt != 0) {                /* ISOC */
 532                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 533                                                     ep->desc.bEndpointAddress);
 534                         urb->transfer_flags = URB_ISO_ASAP
 535                                                 | URB_NO_TRANSFER_DMA_MAP;
 536                         urb->interval = ep->desc.bInterval;
 537                         urb->complete = isoc_irq;
 538                         urb->number_of_packets = npkt;
 539                         for (i = 0; i < npkt; i++) {
 540                                 urb->iso_frame_desc[i].length = psize;
 541                                 urb->iso_frame_desc[i].offset = psize * i;
 542                         }
 543                 } else {                /* bulk */
 544                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 545                                                 ep->desc.bEndpointAddress),
 546                         urb->complete = bulk_irq;
 547                 }
 548         }
 549         return 0;
 550 }
 551
 552 /*
 553  * start the USB transfer
 554  */
 555 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 556 {
 557         struct usb_host_endpoint *ep;
 558         int n, ret;
 559
 560         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 561                 return -ERESTARTSYS;
 562
 563         /* set the higher alternate setting and
 564          * loop until urb submit succeeds */
 565         gspca_dev->alt = gspca_dev->nbalt;
 566         for (;;) {
 567                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 568                 ep = get_ep(gspca_dev);
 569                 if (ep == NULL) {
 570                         ret = -EIO;
 571                         goto out;
 572                 }
 573                 ret = create_urbs(gspca_dev, ep);
 574                 if (ret < 0)
 575                         goto out;
 576
 577                 /* start the cam */
 578                 gspca_dev->sd_desc->start(gspca_dev);
 579                 gspca_dev->streaming = 1;
 580                 atomic_set(&gspca_dev->nevent, 0);
 581
 582                 /* start the bulk transfer is done by the subdriver */
 583                 if (gspca_dev->bulk)
 584                         break;
 585
 586                 /* submit the URBs */
 587                 for (n = 0; n < gspca_dev->nurbs; n++) {
 588                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 589                         if (ret < 0) {
 590                                 PDEBUG(D_ERR|D_STREAM,
 591                                         "usb_submit_urb [%d] err %d", n, ret);
 592                                 gspca_dev->streaming = 0;
 593                                 destroy_urbs(gspca_dev);
 594                                 if (ret == -ENOSPC)
 595                                         break;  /* try the previous alt */
 596                                 goto out;
 597                         }
 598                 }
 599                 if (ret >= 0)
 600                         break;
 601         }
 602 out:
 603         mutex_unlock(&gspca_dev->usb_lock);
 604         return ret;
 605 }
 606
 607 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 608 {
 609         int ret;
 610
 611         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 612         if (ret < 0)
 613                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 614         return ret;
 615 }
 616
 617 /* Note both the queue and the usb lock should be hold when calling this */
 618 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 619 {
 620         gspca_dev->streaming = 0;
 621         atomic_set(&gspca_dev->nevent, 0);
 622         if (gspca_dev->present) {
 623                 if (gspca_dev->sd_desc->stopN)
 624                         gspca_dev->sd_desc->stopN(gspca_dev);
 625                 destroy_urbs(gspca_dev);
 626                 gspca_set_alt0(gspca_dev);
 627                 if (gspca_dev->sd_desc->stop0)
 628                         gspca_dev->sd_desc->stop0(gspca_dev);
 629                 PDEBUG(D_STREAM, "stream off OK");
 630         }
 631 }
 632
 633 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 634 {
 635         int i;
 636
 637         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 638         gspca_dev->curr_mode = i;
 639         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 640         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 641         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 642 }
 643
 644 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 645                         int width, int height)
 646 {
 647         int i;
 648
 649         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 650                 if (width >= gspca_dev->cam.cam_mode[i].width
 651                     && height >= gspca_dev->cam.cam_mode[i].height)
 652                         break;
 653         }
 654         return i;
 655 }
 656
 657 /*
 658  * search a mode with the right pixel format
 659  */
 660 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 661                         int mode,
 662                         int pixfmt)
 663 {
 664         int modeU, modeD;
 665
 666         modeU = modeD = mode;
 667         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 668                 if (--modeD >= 0) {
 669                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 670                                                                 == pixfmt)
 671                                 return modeD;
 672                 }
 673                 if (++modeU < gspca_dev->cam.nmodes) {
 674                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 675                                                                 == pixfmt)
 676                                 return modeU;
 677                 }
 678         }
 679         return -EINVAL;
 680 }
 681
 682 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 683                                 struct v4l2_fmtdesc *fmtdesc)
 684 {
 685         struct gspca_dev *gspca_dev = priv;
 686         int i, j, index;
 687         __u32 fmt_tb[8];
 688
 689         /* give an index to each format */
 690         index = 0;
 691         j = 0;
 692         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 693                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 694                 j = 0;
 695                 for (;;) {
 696                         if (fmt_tb[j] == fmt_tb[index])
 697                                 break;
 698                         j++;
 699                 }
 700                 if (j == index) {
 701                         if (fmtdesc->index == index)
 702                                 break;          /* new format */
 703                         index++;
 704                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 705                                 return -EINVAL;
 706                 }
 707         }
 708         if (i < 0)
 709                 return -EINVAL;         /* no more format */
 710
 711         fmtdesc->pixelformat = fmt_tb[index];
 712         if (gspca_is_compressed(fmt_tb[index]))
 713                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 714         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 715         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 716         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 717         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 718         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 719         fmtdesc->description[4] = '\0';
 720         return 0;
 721 }
 722
 723 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 724                             struct v4l2_format *fmt)
 725 {
 726         struct gspca_dev *gspca_dev = priv;
 727         int mode;
 728
 729         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 730                 return -EINVAL;
 731         mode = gspca_dev->curr_mode;
 732         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 733                 sizeof fmt->fmt.pix);
 734         return 0;
 735 }
 736
 737 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 738                         struct v4l2_format *fmt)
 739 {
 740         int w, h, mode, mode2;
 741
 742         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 743                 return -EINVAL;
 744         w = fmt->fmt.pix.width;
 745         h = fmt->fmt.pix.height;
 746
 747 #ifdef GSPCA_DEBUG
 748         if (gspca_debug & D_CONF)
 749                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 750 #endif
 751         /* search the closest mode for width and height */
 752         mode = wxh_to_mode(gspca_dev, w, h);
 753
 754         /* OK if right palette */
 755         if (gspca_dev->cam.cam_mode[mode].pixelformat
 756                                                 != fmt->fmt.pix.pixelformat) {
 757
 758                 /* else, search the closest mode with the same pixel format */
 759                 mode2 = gspca_get_mode(gspca_dev, mode,
 760                                         fmt->fmt.pix.pixelformat);
 761                 if (mode2 >= 0)
 762                         mode = mode2;
 763 /*              else
 764                         ;                * no chance, return this mode */
 765         }
 766         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 767                 sizeof fmt->fmt.pix);
 768         return mode;                    /* used when s_fmt */
 769 }
 770
 771 static int vidioc_try_fmt_vid_cap(struct file *file,
 772                               void *priv,
 773                               struct v4l2_format *fmt)
 774 {
 775         struct gspca_dev *gspca_dev = priv;
 776         int ret;
 777
 778         ret = try_fmt_vid_cap(gspca_dev, fmt);
 779         if (ret < 0)
 780                 return ret;
 781         return 0;
 782 }
 783
 784 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 785                             struct v4l2_format *fmt)
 786 {
 787         struct gspca_dev *gspca_dev = priv;
 788         int ret;
 789
 790         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 791                 return -ERESTARTSYS;
 792
 793         ret = try_fmt_vid_cap(gspca_dev, fmt);
 794         if (ret < 0)
 795                 goto out;
 796
 797         if (gspca_dev->nframes != 0
 798             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 799                 ret = -EINVAL;
 800                 goto out;
 801         }
 802
 803         if (ret == gspca_dev->curr_mode) {
 804                 ret = 0;
 805                 goto out;                       /* same mode */
 806         }
 807
 808         if (gspca_dev->streaming) {
 809                 ret = -EBUSY;
 810                 goto out;
 811         }
 812         gspca_dev->width = fmt->fmt.pix.width;
 813         gspca_dev->height = fmt->fmt.pix.height;
 814         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 815         gspca_dev->curr_mode = ret;
 816
 817         ret = 0;
 818 out:
 819         mutex_unlock(&gspca_dev->queue_lock);
 820         return ret;
 821 }
 822
 823 static int dev_open(struct inode *inode, struct file *file)
 824 {
 825         struct gspca_dev *gspca_dev;
 826         int ret;
 827
 828         PDEBUG(D_STREAM, "%s open", current->comm);
 829         gspca_dev = (struct gspca_dev *) video_devdata(file);
 830         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 831                 return -ERESTARTSYS;
 832         if (!gspca_dev->present) {
 833                 ret = -ENODEV;
 834                 goto out;
 835         }
 836
 837         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 838                 ret = -EBUSY;
 839                 goto out;
 840         }
 841         gspca_dev->users++;
 842         file->private_data = gspca_dev;
 843 #ifdef GSPCA_DEBUG
 844         /* activate the v4l2 debug */
 845         if (gspca_debug & D_V4L2)
 846                 gspca_dev->vdev.debug |= 3;
 847         else
 848                 gspca_dev->vdev.debug &= ~3;
 849 #endif
 850         ret = 0;
 851 out:
 852         mutex_unlock(&gspca_dev->queue_lock);
 853         if (ret != 0)
 854                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 855         else
 856                 PDEBUG(D_STREAM, "open done");
 857         return ret;
 858 }
 859
 860 static int dev_close(struct inode *inode, struct file *file)
 861 {
 862         struct gspca_dev *gspca_dev = file->private_data;
 863
 864         PDEBUG(D_STREAM, "%s close", current->comm);
 865         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 866                 return -ERESTARTSYS;
 867         gspca_dev->users--;
 868
 869         /* if the file did the capture, free the streaming resources */
 870         if (gspca_dev->capt_file == file) {
 871                 if (gspca_dev->streaming) {
 872                         mutex_lock(&gspca_dev->usb_lock);
 873                         gspca_stream_off(gspca_dev);
 874                         mutex_unlock(&gspca_dev->usb_lock);
 875                 }
 876                 frame_free(gspca_dev);
 877                 gspca_dev->capt_file = NULL;
 878                 gspca_dev->memory = GSPCA_MEMORY_NO;
 879         }
 880         file->private_data = NULL;
 881         mutex_unlock(&gspca_dev->queue_lock);
 882         PDEBUG(D_STREAM, "close done");
 883         return 0;
 884 }
 885
 886 static int vidioc_querycap(struct file *file, void  *priv,
 887                            struct v4l2_capability *cap)
 888 {
 889         struct gspca_dev *gspca_dev = priv;
 890
 891         memset(cap, 0, sizeof *cap);
 892         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 893 /*      strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
 894         if (gspca_dev->dev->product != NULL) {
 895                 strncpy(cap->card, gspca_dev->dev->product,
 896                         sizeof cap->card);
 897         } else {
 898                 snprintf(cap->card, sizeof cap->card,
 899                         "USB Camera (%04x:%04x)",
 900                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 901                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 902         }
 903         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 904                 sizeof cap->bus_info);
 905         cap->version = DRIVER_VERSION_NUMBER;
 906         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 907                           | V4L2_CAP_STREAMING
 908                           | V4L2_CAP_READWRITE;
 909         return 0;
 910 }
 911
 912 static int vidioc_queryctrl(struct file *file, void *priv,
 913                            struct v4l2_queryctrl *q_ctrl)
 914 {
 915         struct gspca_dev *gspca_dev = priv;
 916         int i, ix;
 917         u32 id;
 918
 919         ix = -1;
 920         id = q_ctrl->id;
 921         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 922                 id &= V4L2_CTRL_ID_MASK;
 923                 id++;
 924                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 925                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 926                                 continue;
 927                         if (ix < 0) {
 928                                 ix = i;
 929                                 continue;
 930                         }
 931                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 932                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 933                                 continue;
 934                         ix = i;
 935                 }
 936         }
 937         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 938                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 939                         ix = i;
 940                         break;
 941                 }
 942         }
 943         if (ix < 0)
 944                 return -EINVAL;
 945         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 946                 sizeof *q_ctrl);
 947         if (gspca_dev->ctrl_dis & (1 << ix))
 948                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 949         return 0;
 950 }
 951
 952 static int vidioc_s_ctrl(struct file *file, void *priv,
 953                          struct v4l2_control *ctrl)
 954 {
 955         struct gspca_dev *gspca_dev = priv;
 956         const struct ctrl *ctrls;
 957         int i, ret;
 958
 959         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 960              i < gspca_dev->sd_desc->nctrls;
 961              i++, ctrls++) {
 962                 if (ctrl->id != ctrls->qctrl.id)
 963                         continue;
 964                 if (gspca_dev->ctrl_dis & (1 << i))
 965                         return -EINVAL;
 966                 if (ctrl->value < ctrls->qctrl.minimum
 967                     || ctrl->value > ctrls->qctrl.maximum)
 968                         return -ERANGE;
 969                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
 970                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 971                         return -ERESTARTSYS;
 972                 ret = ctrls->set(gspca_dev, ctrl->value);
 973                 mutex_unlock(&gspca_dev->usb_lock);
 974                 return ret;
 975         }
 976         return -EINVAL;
 977 }
 978
 979 static int vidioc_g_ctrl(struct file *file, void *priv,
 980                          struct v4l2_control *ctrl)
 981 {
 982         struct gspca_dev *gspca_dev = priv;
 983
 984         const struct ctrl *ctrls;
 985         int i, ret;
 986
 987         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 988              i < gspca_dev->sd_desc->nctrls;
 989              i++, ctrls++) {
 990                 if (ctrl->id != ctrls->qctrl.id)
 991                         continue;
 992                 if (gspca_dev->ctrl_dis & (1 << i))
 993                         return -EINVAL;
 994                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 995                         return -ERESTARTSYS;
 996                 ret = ctrls->get(gspca_dev, &ctrl->value);
 997                 mutex_unlock(&gspca_dev->usb_lock);
 998                 return ret;
 999         }
1000         return -EINVAL;
1001 }
1002
1003 static int vidioc_querymenu(struct file *file, void *priv,
1004                             struct v4l2_querymenu *qmenu)
1005 {
1006         struct gspca_dev *gspca_dev = priv;
1007
1008         if (!gspca_dev->sd_desc->querymenu)
1009                 return -EINVAL;
1010         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1011 }
1012
1013 static int vidioc_enum_input(struct file *file, void *priv,
1014                                 struct v4l2_input *input)
1015 {
1016         struct gspca_dev *gspca_dev = priv;
1017
1018         if (input->index != 0)
1019                 return -EINVAL;
1020         memset(input, 0, sizeof *input);
1021         input->type = V4L2_INPUT_TYPE_CAMERA;
1022         strncpy(input->name, gspca_dev->sd_desc->name,
1023                 sizeof input->name);
1024         return 0;
1025 }
1026
1027 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1028 {
1029         *i = 0;
1030         return 0;
1031 }
1032
1033 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1034 {
1035         if (i > 0)
1036                 return -EINVAL;
1037         return (0);
1038 }
1039
1040 static int vidioc_reqbufs(struct file *file, void *priv,
1041                           struct v4l2_requestbuffers *rb)
1042 {
1043         struct gspca_dev *gspca_dev = priv;
1044         int i, ret = 0;
1045
1046         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1047                 return -EINVAL;
1048         switch (rb->memory) {
1049         case GSPCA_MEMORY_READ:                 /* (internal call) */
1050         case V4L2_MEMORY_MMAP:
1051         case V4L2_MEMORY_USERPTR:
1052                 break;
1053         default:
1054                 return -EINVAL;
1055         }
1056         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1057                 return -ERESTARTSYS;
1058
1059         if (gspca_dev->memory != GSPCA_MEMORY_NO
1060             && gspca_dev->memory != rb->memory) {
1061                 ret = -EBUSY;
1062                 goto out;
1063         }
1064
1065         /* only one file may do the capture */
1066         if (gspca_dev->capt_file != NULL
1067             && gspca_dev->capt_file != file) {
1068                 ret = -EBUSY;
1069                 goto out;
1070         }
1071
1072         /* if allocated, the buffers must not be mapped */
1073         for (i = 0; i < gspca_dev->nframes; i++) {
1074                 if (gspca_dev->frame[i].vma_use_count) {
1075                         ret = -EBUSY;
1076                         goto out;
1077                 }
1078         }
1079
1080         /* stop streaming */
1081         if (gspca_dev->streaming) {
1082                 mutex_lock(&gspca_dev->usb_lock);
1083                 gspca_stream_off(gspca_dev);
1084                 mutex_unlock(&gspca_dev->usb_lock);
1085         }
1086
1087         /* free the previous allocated buffers, if any */
1088         if (gspca_dev->nframes != 0) {
1089                 frame_free(gspca_dev);
1090                 gspca_dev->capt_file = NULL;
1091         }
1092         if (rb->count == 0)                     /* unrequest */
1093                 goto out;
1094         gspca_dev->memory = rb->memory;
1095         ret = frame_alloc(gspca_dev, rb->count);
1096         if (ret == 0) {
1097                 rb->count = gspca_dev->nframes;
1098                 gspca_dev->capt_file = file;
1099         }
1100 out:
1101         mutex_unlock(&gspca_dev->queue_lock);
1102         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1103         return ret;
1104 }
1105
1106 static int vidioc_querybuf(struct file *file, void *priv,
1107                            struct v4l2_buffer *v4l2_buf)
1108 {
1109         struct gspca_dev *gspca_dev = priv;
1110         struct gspca_frame *frame;
1111
1112         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1113             || v4l2_buf->index < 0
1114             || v4l2_buf->index >= gspca_dev->nframes)
1115                 return -EINVAL;
1116
1117         frame = &gspca_dev->frame[v4l2_buf->index];
1118         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1119         return 0;
1120 }
1121
1122 static int vidioc_streamon(struct file *file, void *priv,
1123                            enum v4l2_buf_type buf_type)
1124 {
1125         struct gspca_dev *gspca_dev = priv;
1126         int ret;
1127
1128         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1129                 return -EINVAL;
1130         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1131                 return -ERESTARTSYS;
1132         if (!gspca_dev->present) {
1133                 ret = -ENODEV;
1134                 goto out;
1135         }
1136         if (gspca_dev->nframes == 0) {
1137                 ret = -EINVAL;
1138                 goto out;
1139         }
1140         if (!gspca_dev->streaming) {
1141                 ret = gspca_init_transfer(gspca_dev);
1142                 if (ret < 0)
1143                         goto out;
1144         }
1145 #ifdef GSPCA_DEBUG
1146         if (gspca_debug & D_STREAM) {
1147                 PDEBUG_MODE("stream on OK",
1148                         gspca_dev->pixfmt,
1149                         gspca_dev->width,
1150                         gspca_dev->height);
1151         }
1152 #endif
1153         ret = 0;
1154 out:
1155         mutex_unlock(&gspca_dev->queue_lock);
1156         return ret;
1157 }
1158
1159 static int vidioc_streamoff(struct file *file, void *priv,
1160                                 enum v4l2_buf_type buf_type)
1161 {
1162         struct gspca_dev *gspca_dev = priv;
1163         int i, ret;
1164
1165         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1166                 return -EINVAL;
1167         if (!gspca_dev->streaming)
1168                 return 0;
1169         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1170                 return -ERESTARTSYS;
1171
1172         /* stop streaming */
1173         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1174                 ret = -ERESTARTSYS;
1175                 goto out;
1176         }
1177         gspca_stream_off(gspca_dev);
1178         mutex_unlock(&gspca_dev->usb_lock);
1179
1180         /* empty the application queues */
1181         for (i = 0; i < gspca_dev->nframes; i++)
1182                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1183         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1184         gspca_dev->last_packet_type = DISCARD_PACKET;
1185         gspca_dev->sequence = 0;
1186         atomic_set(&gspca_dev->nevent, 0);
1187         ret = 0;
1188 out:
1189         mutex_unlock(&gspca_dev->queue_lock);
1190         return ret;
1191 }
1192
1193 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1194                         struct v4l2_jpegcompression *jpegcomp)
1195 {
1196         struct gspca_dev *gspca_dev = priv;
1197         int ret;
1198
1199         if (!gspca_dev->sd_desc->get_jcomp)
1200                 return -EINVAL;
1201         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1202                 return -ERESTARTSYS;
1203         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1204         mutex_unlock(&gspca_dev->usb_lock);
1205         return ret;
1206 }
1207
1208 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1209                         struct v4l2_jpegcompression *jpegcomp)
1210 {
1211         struct gspca_dev *gspca_dev = priv;
1212         int ret;
1213
1214         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1215                 return -ERESTARTSYS;
1216         if (!gspca_dev->sd_desc->set_jcomp)
1217                 return -EINVAL;
1218         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1219         mutex_unlock(&gspca_dev->usb_lock);
1220         return ret;
1221 }
1222
1223 static int vidioc_g_parm(struct file *filp, void *priv,
1224                         struct v4l2_streamparm *parm)
1225 {
1226         struct gspca_dev *gspca_dev = priv;
1227
1228         memset(parm, 0, sizeof *parm);
1229         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1230         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1231         return 0;
1232 }
1233
1234 static int vidioc_s_parm(struct file *filp, void *priv,
1235                         struct v4l2_streamparm *parm)
1236 {
1237         struct gspca_dev *gspca_dev = priv;
1238         int n;
1239
1240         n = parm->parm.capture.readbuffers;
1241         if (n == 0 || n > GSPCA_MAX_FRAMES)
1242                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1243         else
1244                 gspca_dev->nbufread = n;
1245         return 0;
1246 }
1247
1248 static int vidioc_s_std(struct file *filp, void *priv,
1249                         v4l2_std_id *parm)
1250 {
1251         return 0;
1252 }
1253
1254 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1255 static int vidiocgmbuf(struct file *file, void *priv,
1256                         struct video_mbuf *mbuf)
1257 {
1258         struct gspca_dev *gspca_dev = file->private_data;
1259         int i;
1260
1261         PDEBUG(D_STREAM, "cgmbuf");
1262         if (gspca_dev->nframes == 0) {
1263                 int ret;
1264
1265                 {
1266                         struct v4l2_format fmt;
1267
1268                         memset(&fmt, 0, sizeof fmt);
1269                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1270                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1271                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1272                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1273                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1274                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1275                         if (ret != 0)
1276                                 return ret;
1277                 }
1278                 {
1279                         struct v4l2_requestbuffers rb;
1280
1281                         memset(&rb, 0, sizeof rb);
1282                         rb.count = 4;
1283                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1284                         rb.memory = V4L2_MEMORY_MMAP;
1285                         ret = vidioc_reqbufs(file, priv, &rb);
1286                         if (ret != 0)
1287                                 return ret;
1288                 }
1289         }
1290         mbuf->frames = gspca_dev->nframes;
1291         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1292         for (i = 0; i < mbuf->frames; i++)
1293                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1294         return 0;
1295 }
1296 #endif
1297
1298 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1299 {
1300         struct gspca_dev *gspca_dev = file->private_data;
1301         struct gspca_frame *frame;
1302         struct page *page;
1303         unsigned long addr, start, size;
1304         int i, ret;
1305
1306         start = vma->vm_start;
1307         size = vma->vm_end - vma->vm_start;
1308         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1309
1310         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1311                 return -ERESTARTSYS;
1312         if (!gspca_dev->present) {
1313                 ret = -ENODEV;
1314                 goto out;
1315         }
1316         if (gspca_dev->capt_file != file) {
1317                 ret = -EINVAL;
1318                 goto out;
1319         }
1320
1321         frame = NULL;
1322         for (i = 0; i < gspca_dev->nframes; ++i) {
1323                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1324                         PDEBUG(D_STREAM, "mmap bad memory type");
1325                         break;
1326                 }
1327                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1328                                                 == vma->vm_pgoff) {
1329                         frame = &gspca_dev->frame[i];
1330                         break;
1331                 }
1332         }
1333         if (frame == NULL) {
1334                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1335                 ret = -EINVAL;
1336                 goto out;
1337         }
1338 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1339         /* v4l1 maps all the buffers */
1340         if (i != 0
1341             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1342 #endif
1343             if (size != frame->v4l2_buf.length) {
1344                 PDEBUG(D_STREAM, "mmap bad size");
1345                 ret = -EINVAL;
1346                 goto out;
1347         }
1348
1349         /*
1350          * - VM_IO marks the area as being a mmaped region for I/O to a
1351          *   device. It also prevents the region from being core dumped.
1352          */
1353         vma->vm_flags |= VM_IO;
1354
1355         addr = (unsigned long) frame->data;
1356         while (size > 0) {
1357                 page = vmalloc_to_page((void *) addr);
1358                 ret = vm_insert_page(vma, start, page);
1359                 if (ret < 0)
1360                         goto out;
1361                 start += PAGE_SIZE;
1362                 addr += PAGE_SIZE;
1363                 size -= PAGE_SIZE;
1364         }
1365
1366         vma->vm_ops = &gspca_vm_ops;
1367         vma->vm_private_data = frame;
1368         gspca_vm_open(vma);
1369         ret = 0;
1370 out:
1371         mutex_unlock(&gspca_dev->queue_lock);
1372         return ret;
1373 }
1374
1375 /*
1376  * wait for a video frame
1377  *
1378  * If a frame is ready, its index is returned.
1379  */
1380 static int frame_wait(struct gspca_dev *gspca_dev,
1381                         int nonblock_ing)
1382 {
1383         struct gspca_frame *frame;
1384         int i, j, ret;
1385
1386         /* check if a frame is ready */
1387         i = gspca_dev->fr_o;
1388         j = gspca_dev->fr_queue[i];
1389         frame = &gspca_dev->frame[j];
1390         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1391                 atomic_dec(&gspca_dev->nevent);
1392                 goto ok;
1393         }
1394         if (nonblock_ing)                       /* no frame yet */
1395                 return -EAGAIN;
1396
1397         /* wait till a frame is ready */
1398         for (;;) {
1399                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1400                                         atomic_read(&gspca_dev->nevent) > 0,
1401                                         msecs_to_jiffies(3000));
1402                 if (ret <= 0) {
1403                         if (ret < 0)
1404                                 return ret;     /* interrupt */
1405                         return -EIO;            /* timeout */
1406                 }
1407                 atomic_dec(&gspca_dev->nevent);
1408                 if (!gspca_dev->streaming || !gspca_dev->present)
1409                         return -EIO;
1410                 i = gspca_dev->fr_o;
1411                 j = gspca_dev->fr_queue[i];
1412                 frame = &gspca_dev->frame[j];
1413                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1414                         break;
1415         }
1416 ok:
1417         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1418         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1419                 gspca_dev->fr_q,
1420                 gspca_dev->fr_i,
1421                 gspca_dev->fr_o);
1422
1423         if (gspca_dev->sd_desc->dq_callback) {
1424                 mutex_lock(&gspca_dev->usb_lock);
1425                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1426                 mutex_unlock(&gspca_dev->usb_lock);
1427         }
1428         return j;
1429 }
1430
1431 /*
1432  * dequeue a video buffer
1433  *
1434  * If nonblock_ing is false, block until a buffer is available.
1435  */
1436 static int vidioc_dqbuf(struct file *file, void *priv,
1437                         struct v4l2_buffer *v4l2_buf)
1438 {
1439         struct gspca_dev *gspca_dev = priv;
1440         struct gspca_frame *frame;
1441         int i, ret;
1442
1443         PDEBUG(D_FRAM, "dqbuf");
1444         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1445                 return -EINVAL;
1446         if (v4l2_buf->memory != gspca_dev->memory)
1447                 return -EINVAL;
1448
1449         /* if not streaming, be sure the application will not loop forever */
1450         if (!(file->f_flags & O_NONBLOCK)
1451             && !gspca_dev->streaming && gspca_dev->users == 1)
1452                 return -EINVAL;
1453
1454         /* only the capturing file may dequeue */
1455         if (gspca_dev->capt_file != file)
1456                 return -EINVAL;
1457
1458         /* only one dequeue / read at a time */
1459         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1460                 return -ERESTARTSYS;
1461
1462         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1463         if (ret < 0)
1464                 goto out;
1465         i = ret;                                /* frame index */
1466         frame = &gspca_dev->frame[i];
1467         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1468                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1469                                  frame->data,
1470                                  frame->v4l2_buf.bytesused)) {
1471                         PDEBUG(D_ERR|D_STREAM,
1472                                 "dqbuf cp to user failed");
1473                         ret = -EFAULT;
1474                         goto out;
1475                 }
1476         }
1477         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1478         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1479         PDEBUG(D_FRAM, "dqbuf %d", i);
1480         ret = 0;
1481 out:
1482         mutex_unlock(&gspca_dev->read_lock);
1483         return ret;
1484 }
1485
1486 /*
1487  * queue a video buffer
1488  *
1489  * Attempting to queue a buffer that has already been
1490  * queued will return -EINVAL.
1491  */
1492 static int vidioc_qbuf(struct file *file, void *priv,
1493                         struct v4l2_buffer *v4l2_buf)
1494 {
1495         struct gspca_dev *gspca_dev = priv;
1496         struct gspca_frame *frame;
1497         int i, index, ret;
1498
1499         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1500         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1501                 return -EINVAL;
1502
1503         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1504                 return -ERESTARTSYS;
1505
1506         index = v4l2_buf->index;
1507         if ((unsigned) index >= gspca_dev->nframes) {
1508                 PDEBUG(D_FRAM,
1509                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1510                 ret = -EINVAL;
1511                 goto out;
1512         }
1513         if (v4l2_buf->memory != gspca_dev->memory) {
1514                 PDEBUG(D_FRAM, "qbuf bad memory type");
1515                 ret = -EINVAL;
1516                 goto out;
1517         }
1518
1519         frame = &gspca_dev->frame[index];
1520         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1521                 PDEBUG(D_FRAM, "qbuf bad state");
1522                 ret = -EINVAL;
1523                 goto out;
1524         }
1525
1526         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1527 /*      frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1528
1529         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1530                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1531                 frame->v4l2_buf.length = v4l2_buf->length;
1532         }
1533
1534         /* put the buffer in the 'queued' queue */
1535         i = gspca_dev->fr_q;
1536         gspca_dev->fr_queue[i] = index;
1537         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1538         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1539                 gspca_dev->fr_q,
1540                 gspca_dev->fr_i,
1541                 gspca_dev->fr_o);
1542
1543         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1544         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1545         ret = 0;
1546 out:
1547         mutex_unlock(&gspca_dev->queue_lock);
1548         return ret;
1549 }
1550
1551 /*
1552  * allocate the resources for read()
1553  */
1554 static int read_alloc(struct gspca_dev *gspca_dev,
1555                         struct file *file)
1556 {
1557         struct v4l2_buffer v4l2_buf;
1558         int i, ret;
1559
1560         PDEBUG(D_STREAM, "read alloc");
1561         if (gspca_dev->nframes == 0) {
1562                 struct v4l2_requestbuffers rb;
1563
1564                 memset(&rb, 0, sizeof rb);
1565                 rb.count = gspca_dev->nbufread;
1566                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1567                 rb.memory = GSPCA_MEMORY_READ;
1568                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1569                 if (ret != 0) {
1570                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1571                         return ret;
1572                 }
1573                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1574                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1575                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1576                 for (i = 0; i < gspca_dev->nbufread; i++) {
1577                         v4l2_buf.index = i;
1578                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1579                         if (ret != 0) {
1580                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1581                                 return ret;
1582                         }
1583                 }
1584                 gspca_dev->memory = GSPCA_MEMORY_READ;
1585         }
1586
1587         /* start streaming */
1588         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1589         if (ret != 0)
1590                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1591         return ret;
1592 }
1593
1594 static unsigned int dev_poll(struct file *file, poll_table *wait)
1595 {
1596         struct gspca_dev *gspca_dev = file->private_data;
1597         int i, ret;
1598
1599         PDEBUG(D_FRAM, "poll");
1600
1601         poll_wait(file, &gspca_dev->wq, wait);
1602         if (!gspca_dev->present)
1603                 return POLLERR;
1604
1605         /* if reqbufs is not done, the user would use read() */
1606         if (gspca_dev->nframes == 0) {
1607                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1608                         return POLLERR;         /* not the 1st time */
1609                 ret = read_alloc(gspca_dev, file);
1610                 if (ret != 0)
1611                         return POLLERR;
1612         }
1613
1614         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1615                 return POLLERR;
1616         if (!gspca_dev->present) {
1617                 ret = POLLERR;
1618                 goto out;
1619         }
1620
1621         /* check the next incoming buffer */
1622         i = gspca_dev->fr_o;
1623         i = gspca_dev->fr_queue[i];
1624         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1625                 ret = POLLIN | POLLRDNORM;      /* something to read */
1626         else
1627                 ret = 0;
1628 out:
1629         mutex_unlock(&gspca_dev->queue_lock);
1630         return ret;
1631 }
1632
1633 static ssize_t dev_read(struct file *file, char __user *data,
1634                     size_t count, loff_t *ppos)
1635 {
1636         struct gspca_dev *gspca_dev = file->private_data;
1637         struct gspca_frame *frame;
1638         struct v4l2_buffer v4l2_buf;
1639         struct timeval timestamp;
1640         int n, ret, ret2;
1641
1642         PDEBUG(D_FRAM, "read (%zd)", count);
1643         if (!gspca_dev->present)
1644                 return -ENODEV;
1645         switch (gspca_dev->memory) {
1646         case GSPCA_MEMORY_NO:                   /* first time */
1647                 ret = read_alloc(gspca_dev, file);
1648                 if (ret != 0)
1649                         return ret;
1650                 break;
1651         case GSPCA_MEMORY_READ:
1652                 if (gspca_dev->capt_file == file)
1653                         break;
1654                 /* fall thru */
1655         default:
1656                 return -EINVAL;
1657         }
1658
1659         /* get a frame */
1660         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1661         timestamp.tv_sec--;
1662         n = 2;
1663         for (;;) {
1664                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1665                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1666                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1667                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1668                 if (ret != 0) {
1669                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1670                         return ret;
1671                 }
1672
1673                 /* if the process slept for more than 1 second,
1674                  * get anewer frame */
1675                 frame = &gspca_dev->frame[v4l2_buf.index];
1676                 if (--n < 0)
1677                         break;                  /* avoid infinite loop */
1678                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1679                         break;
1680                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1681                 if (ret != 0) {
1682                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1683                         return ret;
1684                 }
1685         }
1686
1687         /* copy the frame */
1688         if (count > frame->v4l2_buf.bytesused)
1689                 count = frame->v4l2_buf.bytesused;
1690         ret = copy_to_user(data, frame->data, count);
1691         if (ret != 0) {
1692                 PDEBUG(D_ERR|D_STREAM,
1693                         "read cp to user lack %d / %zd", ret, count);
1694                 ret = -EFAULT;
1695                 goto out;
1696         }
1697         ret = count;
1698 out:
1699         /* in each case, requeue the buffer */
1700         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1701         if (ret2 != 0)
1702                 return ret2;
1703         return ret;
1704 }
1705
1706 static void dev_release(struct video_device *vfd)
1707 {
1708         /* nothing */
1709 }
1710
1711 static struct file_operations dev_fops = {
1712         .owner = THIS_MODULE,
1713         .open = dev_open,
1714         .release = dev_close,
1715         .read = dev_read,
1716         .mmap = dev_mmap,
1717         .ioctl = video_ioctl2,
1718 #ifdef CONFIG_COMPAT
1719         .compat_ioctl = v4l_compat_ioctl32,
1720 #endif
1721         .llseek = no_llseek,
1722         .poll   = dev_poll,
1723 };
1724
1725 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1726         .vidioc_querycap        = vidioc_querycap,
1727         .vidioc_dqbuf           = vidioc_dqbuf,
1728         .vidioc_qbuf            = vidioc_qbuf,
1729         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1730         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1731         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1732         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1733         .vidioc_streamon        = vidioc_streamon,
1734         .vidioc_queryctrl       = vidioc_queryctrl,
1735         .vidioc_g_ctrl          = vidioc_g_ctrl,
1736         .vidioc_s_ctrl          = vidioc_s_ctrl,
1737         .vidioc_querymenu       = vidioc_querymenu,
1738         .vidioc_enum_input      = vidioc_enum_input,
1739         .vidioc_g_input         = vidioc_g_input,
1740         .vidioc_s_input         = vidioc_s_input,
1741         .vidioc_reqbufs         = vidioc_reqbufs,
1742         .vidioc_querybuf        = vidioc_querybuf,
1743         .vidioc_streamoff       = vidioc_streamoff,
1744         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1745         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1746         .vidioc_g_parm          = vidioc_g_parm,
1747         .vidioc_s_parm          = vidioc_s_parm,
1748         .vidioc_s_std           = vidioc_s_std,
1749 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1750         .vidiocgmbuf          = vidiocgmbuf,
1751 #endif
1752 };
1753
1754 static struct video_device gspca_template = {
1755         .name = "gspca main driver",
1756         .fops = &dev_fops,
1757         .ioctl_ops = &dev_ioctl_ops,
1758         .release = dev_release,         /* mandatory */
1759         .minor = -1,
1760 };
1761
1762 /*
1763  * probe and create a new gspca device
1764  *
1765  * This function must be called by the sub-driver when it is
1766  * called for probing a new device.
1767  */
1768 int gspca_dev_probe(struct usb_interface *intf,
1769                 const struct usb_device_id *id,
1770                 const struct sd_desc *sd_desc,
1771                 int dev_size,
1772                 struct module *module)
1773 {
1774         struct usb_interface_descriptor *interface;
1775         struct gspca_dev *gspca_dev;
1776         struct usb_device *dev = interface_to_usbdev(intf);
1777         int ret;
1778
1779         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1780
1781         /* we don't handle multi-config cameras */
1782         if (dev->descriptor.bNumConfigurations != 1)
1783                 return -ENODEV;
1784         interface = &intf->cur_altsetting->desc;
1785         if (interface->bInterfaceNumber > 0)
1786                 return -ENODEV;
1787
1788         /* create the device */
1789         if (dev_size < sizeof *gspca_dev)
1790                 dev_size = sizeof *gspca_dev;
1791         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1792         if (gspca_dev == NULL) {
1793                 err("couldn't kzalloc gspca struct");
1794                 return -EIO;
1795         }
1796         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1797         if (!gspca_dev->usb_buf) {
1798                 err("out of memory");
1799                 ret = -EIO;
1800                 goto out;
1801         }
1802         gspca_dev->dev = dev;
1803         gspca_dev->iface = interface->bInterfaceNumber;
1804         gspca_dev->nbalt = intf->num_altsetting;
1805         gspca_dev->sd_desc = sd_desc;
1806 /*      gspca_dev->users = 0;                   (done by kzalloc) */
1807         gspca_dev->nbufread = 2;
1808
1809         /* configure the subdriver and initialize the USB device */
1810         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1811         if (ret < 0)
1812                 goto out;
1813         ret = gspca_dev->sd_desc->init(gspca_dev);
1814         if (ret < 0)
1815                 goto out;
1816         ret = gspca_set_alt0(gspca_dev);
1817         if (ret < 0)
1818                 goto out;
1819         gspca_set_default_mode(gspca_dev);
1820
1821         mutex_init(&gspca_dev->usb_lock);
1822         mutex_init(&gspca_dev->read_lock);
1823         mutex_init(&gspca_dev->queue_lock);
1824         init_waitqueue_head(&gspca_dev->wq);
1825
1826         /* init video stuff */
1827         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1828         gspca_dev->vdev.parent = &dev->dev;
1829         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1830         gspca_dev->vdev.fops = &gspca_dev->fops;
1831         gspca_dev->fops.owner = module;         /* module protection */
1832         gspca_dev->present = 1;
1833         ret = video_register_device(&gspca_dev->vdev,
1834                                   VFL_TYPE_GRABBER,
1835                                   video_nr);
1836         if (ret < 0) {
1837                 err("video_register_device err %d", ret);
1838                 goto out;
1839         }
1840
1841         usb_set_intfdata(intf, gspca_dev);
1842         PDEBUG(D_PROBE, "probe ok");
1843         return 0;
1844 out:
1845         kfree(gspca_dev->usb_buf);
1846         kfree(gspca_dev);
1847         return ret;
1848 }
1849 EXPORT_SYMBOL(gspca_dev_probe);
1850
1851 /*
1852  * USB disconnection
1853  *
1854  * This function must be called by the sub-driver
1855  * when the device disconnects, after the specific resources are freed.
1856  */
1857 void gspca_disconnect(struct usb_interface *intf)
1858 {
1859         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1860
1861         if (!gspca_dev)
1862                 return;
1863         gspca_dev->present = 0;
1864         mutex_lock(&gspca_dev->queue_lock);
1865         mutex_lock(&gspca_dev->usb_lock);
1866         gspca_dev->streaming = 0;
1867         destroy_urbs(gspca_dev);
1868         mutex_unlock(&gspca_dev->usb_lock);
1869         mutex_unlock(&gspca_dev->queue_lock);
1870         while (gspca_dev->users != 0) {         /* wait until fully closed */
1871                 atomic_inc(&gspca_dev->nevent);
1872                 wake_up_interruptible(&gspca_dev->wq);  /* wake processes */
1873                 schedule();
1874         }
1875 /* We don't want people trying to open up the device */
1876         video_unregister_device(&gspca_dev->vdev);
1877 /* Free the memory */
1878         kfree(gspca_dev->usb_buf);
1879         kfree(gspca_dev);
1880         PDEBUG(D_PROBE, "disconnect complete");
1881 }
1882 EXPORT_SYMBOL(gspca_disconnect);
1883
1884 #ifdef CONFIG_PM
1885 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1886 {
1887         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1888
1889         if (!gspca_dev->streaming)
1890                 return 0;
1891         gspca_dev->frozen = 1;          /* avoid urb error messages */
1892         if (gspca_dev->sd_desc->stopN)
1893                 gspca_dev->sd_desc->stopN(gspca_dev);
1894         destroy_urbs(gspca_dev);
1895         gspca_set_alt0(gspca_dev);
1896         if (gspca_dev->sd_desc->stop0)
1897                 gspca_dev->sd_desc->stop0(gspca_dev);
1898         return 0;
1899 }
1900 EXPORT_SYMBOL(gspca_suspend);
1901
1902 int gspca_resume(struct usb_interface *intf)
1903 {
1904         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1905
1906         gspca_dev->frozen = 0;
1907         gspca_dev->sd_desc->init(gspca_dev);
1908         if (gspca_dev->streaming)
1909                 return gspca_init_transfer(gspca_dev);
1910         return 0;
1911 }
1912 EXPORT_SYMBOL(gspca_resume);
1913 #endif
1914 /* -- cam driver utility functions -- */
1915
1916 /* auto gain and exposure algorithm based on the knee algorithm described here:
1917    http://ytse.tricolour.net/docs/LowLightOptimization.html
1918
1919    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1920    where changed. */
1921 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1922         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1923 {
1924         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1925         const struct ctrl *gain_ctrl = NULL;
1926         const struct ctrl *exposure_ctrl = NULL;
1927         const struct ctrl *autogain_ctrl = NULL;
1928         int retval = 0;
1929
1930         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1931                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1932                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1933                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1934                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1935                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1936                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1937         }
1938         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1939                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1940                         "on cam without (auto)gain/exposure");
1941                 return 0;
1942         }
1943
1944         if (gain_ctrl->get(gspca_dev, &gain) ||
1945                         exposure_ctrl->get(gspca_dev, &exposure) ||
1946                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1947                 return 0;
1948
1949         orig_gain = gain;
1950         orig_exposure = exposure;
1951
1952         /* If we are of a multiple of deadzone, do multiple steps to reach the
1953            desired lumination fast (with the risc of a slight overshoot) */
1954         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1955
1956         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1957                 avg_lum, desired_avg_lum, steps);
1958
1959         for (i = 0; i < steps; i++) {
1960                 if (avg_lum > desired_avg_lum) {
1961                         if (gain > gain_knee)
1962                                 gain--;
1963                         else if (exposure > exposure_knee)
1964                                 exposure--;
1965                         else if (gain > gain_ctrl->qctrl.default_value)
1966                                 gain--;
1967                         else if (exposure > exposure_ctrl->qctrl.minimum)
1968                                 exposure--;
1969                         else if (gain > gain_ctrl->qctrl.minimum)
1970                                 gain--;
1971                         else
1972                                 break;
1973                 } else {
1974                         if (gain < gain_ctrl->qctrl.default_value)
1975                                 gain++;
1976                         else if (exposure < exposure_knee)
1977                                 exposure++;
1978                         else if (gain < gain_knee)
1979                                 gain++;
1980                         else if (exposure < exposure_ctrl->qctrl.maximum)
1981                                 exposure++;
1982                         else if (gain < gain_ctrl->qctrl.maximum)
1983                                 gain++;
1984                         else
1985                                 break;
1986                 }
1987         }
1988
1989         if (gain != orig_gain) {
1990                 gain_ctrl->set(gspca_dev, gain);
1991                 retval = 1;
1992         }
1993         if (exposure != orig_exposure) {
1994                 exposure_ctrl->set(gspca_dev, exposure);
1995                 retval = 1;
1996         }
1997
1998         return retval;
1999 }
2000 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2001
2002 /* -- module insert / remove -- */
2003 static int __init gspca_init(void)
2004 {
2005         info("main v%d.%d.%d registered",
2006                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2007                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2008                 DRIVER_VERSION_NUMBER & 0xff);
2009         return 0;
2010 }
2011 static void __exit gspca_exit(void)
2012 {
2013         info("main deregistered");
2014 }
2015
2016 module_init(gspca_init);
2017 module_exit(gspca_exit);
2018
2019 #ifdef GSPCA_DEBUG
2020 module_param_named(debug, gspca_debug, int, 0644);
2021 MODULE_PARM_DESC(debug,
2022                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2023                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2024                 " 0x0100: v4l2");
2025 #endif