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

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