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