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                         destroy_urbs(gspca_dev);
 463                         return -ENOMEM;
 464                 }
 465                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 466                                                 bsize,
 467                                                 GFP_KERNEL,
 468                                                 &urb->transfer_dma);
 469
 470                 if (urb->transfer_buffer == NULL) {
 471                         usb_free_urb(urb);
 472                         err("usb_buffer_urb failed");
 473                         destroy_urbs(gspca_dev);
 474                         return -ENOMEM;
 475                 }
 476                 gspca_dev->urb[n] = urb;
 477                 urb->dev = gspca_dev->dev;
 478                 urb->context = gspca_dev;
 479                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 480                                             ep->desc.bEndpointAddress);
 481                 urb->transfer_flags = URB_ISO_ASAP
 482                                         | URB_NO_TRANSFER_DMA_MAP;
 483                 urb->interval = ep->desc.bInterval;
 484                 urb->complete = isoc_irq;
 485                 urb->number_of_packets = npkt;
 486                 urb->transfer_buffer_length = bsize;
 487                 for (i = 0; i < npkt; i++) {
 488                         urb->iso_frame_desc[i].length = psize;
 489                         urb->iso_frame_desc[i].offset = psize * i;
 490                 }
 491         }
 492         return 0;
 493 }
 494
 495 /*
 496  * start the USB transfer
 497  */
 498 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 499 {
 500         struct usb_host_endpoint *ep;
 501         int n, ret;
 502
 503         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 504                 return -ERESTARTSYS;
 505
 506         /* set the higher alternate setting and
 507          * loop until urb submit succeeds */
 508         gspca_dev->alt = gspca_dev->nbalt;
 509         for (;;) {
 510                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 511                 ep = get_isoc_ep(gspca_dev);
 512                 if (ep == NULL) {
 513                         ret = -EIO;
 514                         goto out;
 515                 }
 516                 ret = create_urbs(gspca_dev, ep);
 517                 if (ret < 0)
 518                         goto out;
 519
 520                 /* start the cam */
 521                 gspca_dev->sd_desc->start(gspca_dev);
 522                 gspca_dev->streaming = 1;
 523                 atomic_set(&gspca_dev->nevent, 0);
 524
 525                 /* submit the URBs */
 526                 for (n = 0; n < gspca_dev->nurbs; n++) {
 527                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 528                         if (ret < 0) {
 529                                 PDEBUG(D_ERR|D_STREAM,
 530                                         "usb_submit_urb [%d] err %d", n, ret);
 531                                 gspca_dev->streaming = 0;
 532                                 destroy_urbs(gspca_dev);
 533                                 if (ret == -ENOSPC)
 534                                         break;  /* try the previous alt */
 535                                 goto out;
 536                         }
 537                 }
 538                 if (ret >= 0)
 539                         break;
 540         }
 541 out:
 542         mutex_unlock(&gspca_dev->usb_lock);
 543         return ret;
 544 }
 545
 546 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 547 {
 548         int ret;
 549
 550         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 551         if (ret < 0)
 552                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 553         return ret;
 554 }
 555
 556 /* Note both the queue and the usb lock should be hold when calling this */
 557 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 558 {
 559         gspca_dev->streaming = 0;
 560         atomic_set(&gspca_dev->nevent, 0);
 561         if (gspca_dev->present) {
 562                 if (gspca_dev->sd_desc->stopN)
 563                         gspca_dev->sd_desc->stopN(gspca_dev);
 564                 destroy_urbs(gspca_dev);
 565                 gspca_set_alt0(gspca_dev);
 566                 if (gspca_dev->sd_desc->stop0)
 567                         gspca_dev->sd_desc->stop0(gspca_dev);
 568                 PDEBUG(D_STREAM, "stream off OK");
 569         }
 570 }
 571
 572 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 573 {
 574         int i;
 575
 576         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 577         gspca_dev->curr_mode = i;
 578         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 579         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 580         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 581 }
 582
 583 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 584                         int width, int height)
 585 {
 586         int i;
 587
 588         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 589                 if (width >= gspca_dev->cam.cam_mode[i].width
 590                     && height >= gspca_dev->cam.cam_mode[i].height)
 591                         break;
 592         }
 593         return i;
 594 }
 595
 596 /*
 597  * search a mode with the right pixel format
 598  */
 599 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 600                         int mode,
 601                         int pixfmt)
 602 {
 603         int modeU, modeD;
 604
 605         modeU = modeD = mode;
 606         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 607                 if (--modeD >= 0) {
 608                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 609                                                                 == pixfmt)
 610                                 return modeD;
 611                 }
 612                 if (++modeU < gspca_dev->cam.nmodes) {
 613                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 614                                                                 == pixfmt)
 615                                 return modeU;
 616                 }
 617         }
 618         return -EINVAL;
 619 }
 620
 621 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 622                                 struct v4l2_fmtdesc *fmtdesc)
 623 {
 624         struct gspca_dev *gspca_dev = priv;
 625         int i, j, index;
 626         __u32 fmt_tb[8];
 627
 628         /* give an index to each format */
 629         index = 0;
 630         j = 0;
 631         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 632                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 633                 j = 0;
 634                 for (;;) {
 635                         if (fmt_tb[j] == fmt_tb[index])
 636                                 break;
 637                         j++;
 638                 }
 639                 if (j == index) {
 640                         if (fmtdesc->index == index)
 641                                 break;          /* new format */
 642                         index++;
 643                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 644                                 return -EINVAL;
 645                 }
 646         }
 647         if (i < 0)
 648                 return -EINVAL;         /* no more format */
 649
 650         fmtdesc->pixelformat = fmt_tb[index];
 651         if (gspca_is_compressed(fmt_tb[index]))
 652                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 653         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 654         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 655         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 656         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 657         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 658         fmtdesc->description[4] = '\0';
 659         return 0;
 660 }
 661
 662 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 663                             struct v4l2_format *fmt)
 664 {
 665         struct gspca_dev *gspca_dev = priv;
 666         int mode;
 667
 668         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 669                 return -EINVAL;
 670         mode = gspca_dev->curr_mode;
 671         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 672                 sizeof fmt->fmt.pix);
 673         return 0;
 674 }
 675
 676 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 677                         struct v4l2_format *fmt)
 678 {
 679         int w, h, mode, mode2;
 680
 681         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 682                 return -EINVAL;
 683         w = fmt->fmt.pix.width;
 684         h = fmt->fmt.pix.height;
 685
 686 #ifdef GSPCA_DEBUG
 687         if (gspca_debug & D_CONF)
 688                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 689 #endif
 690         /* search the closest mode for width and height */
 691         mode = wxh_to_mode(gspca_dev, w, h);
 692
 693         /* OK if right palette */
 694         if (gspca_dev->cam.cam_mode[mode].pixelformat
 695                                                 != fmt->fmt.pix.pixelformat) {
 696
 697                 /* else, search the closest mode with the same pixel format */
 698                 mode2 = gspca_get_mode(gspca_dev, mode,
 699                                         fmt->fmt.pix.pixelformat);
 700                 if (mode2 >= 0)
 701                         mode = mode2;
 702 /*              else
 703                         ;                * no chance, return this mode */
 704         }
 705         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 706                 sizeof fmt->fmt.pix);
 707         return mode;                    /* used when s_fmt */
 708 }
 709
 710 static int vidioc_try_fmt_vid_cap(struct file *file,
 711                               void *priv,
 712                               struct v4l2_format *fmt)
 713 {
 714         struct gspca_dev *gspca_dev = priv;
 715         int ret;
 716
 717         ret = try_fmt_vid_cap(gspca_dev, fmt);
 718         if (ret < 0)
 719                 return ret;
 720         return 0;
 721 }
 722
 723 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 724                             struct v4l2_format *fmt)
 725 {
 726         struct gspca_dev *gspca_dev = priv;
 727         int ret;
 728
 729         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 730                 return -ERESTARTSYS;
 731
 732         ret = try_fmt_vid_cap(gspca_dev, fmt);
 733         if (ret < 0)
 734                 goto out;
 735
 736         if (gspca_dev->nframes != 0
 737             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 738                 ret = -EINVAL;
 739                 goto out;
 740         }
 741
 742         if (ret == gspca_dev->curr_mode) {
 743                 ret = 0;
 744                 goto out;                       /* same mode */
 745         }
 746
 747         if (gspca_dev->streaming) {
 748                 ret = -EBUSY;
 749                 goto out;
 750         }
 751         gspca_dev->width = fmt->fmt.pix.width;
 752         gspca_dev->height = fmt->fmt.pix.height;
 753         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 754         gspca_dev->curr_mode = ret;
 755
 756         ret = 0;
 757 out:
 758         mutex_unlock(&gspca_dev->queue_lock);
 759         return ret;
 760 }
 761
 762 static int dev_open(struct inode *inode, struct file *file)
 763 {
 764         struct gspca_dev *gspca_dev;
 765         int ret;
 766
 767         PDEBUG(D_STREAM, "%s open", current->comm);
 768         gspca_dev = (struct gspca_dev *) video_devdata(file);
 769         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 770                 return -ERESTARTSYS;
 771         if (!gspca_dev->present) {
 772                 ret = -ENODEV;
 773                 goto out;
 774         }
 775
 776         if (gspca_dev->users > 4) {     /* (arbitrary value) */
 777                 ret = -EBUSY;
 778                 goto out;
 779         }
 780         gspca_dev->users++;
 781         file->private_data = gspca_dev;
 782 #ifdef GSPCA_DEBUG
 783         /* activate the v4l2 debug */
 784         if (gspca_debug & D_V4L2)
 785                 gspca_dev->vdev.debug |= 3;
 786         else
 787                 gspca_dev->vdev.debug &= ~3;
 788 #endif
 789         ret = 0;
 790 out:
 791         mutex_unlock(&gspca_dev->queue_lock);
 792         if (ret != 0)
 793                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 794         else
 795                 PDEBUG(D_STREAM, "open done");
 796         return ret;
 797 }
 798
 799 static int dev_close(struct inode *inode, struct file *file)
 800 {
 801         struct gspca_dev *gspca_dev = file->private_data;
 802
 803         PDEBUG(D_STREAM, "%s close", current->comm);
 804         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 805                 return -ERESTARTSYS;
 806         gspca_dev->users--;
 807
 808         /* if the file did the capture, free the streaming resources */
 809         if (gspca_dev->capt_file == file) {
 810                 if (gspca_dev->streaming) {
 811                         mutex_lock(&gspca_dev->usb_lock);
 812                         gspca_stream_off(gspca_dev);
 813                         mutex_unlock(&gspca_dev->usb_lock);
 814                 }
 815                 frame_free(gspca_dev);
 816                 gspca_dev->capt_file = NULL;
 817                 gspca_dev->memory = GSPCA_MEMORY_NO;
 818         }
 819         file->private_data = NULL;
 820         mutex_unlock(&gspca_dev->queue_lock);
 821         PDEBUG(D_STREAM, "close done");
 822         return 0;
 823 }
 824
 825 static int vidioc_querycap(struct file *file, void  *priv,
 826                            struct v4l2_capability *cap)
 827 {
 828         struct gspca_dev *gspca_dev = priv;
 829
 830         memset(cap, 0, sizeof *cap);
 831         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 832 /*      strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
 833         if (gspca_dev->dev->product != NULL) {
 834                 strncpy(cap->card, gspca_dev->dev->product,
 835                         sizeof cap->card);
 836         } else {
 837                 snprintf(cap->card, sizeof cap->card,
 838                         "USB Camera (%04x:%04x)",
 839                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
 840                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
 841         }
 842         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 843                 sizeof cap->bus_info);
 844         cap->version = DRIVER_VERSION_NUMBER;
 845         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 846                           | V4L2_CAP_STREAMING
 847                           | V4L2_CAP_READWRITE;
 848         return 0;
 849 }
 850
 851 static int vidioc_queryctrl(struct file *file, void *priv,
 852                            struct v4l2_queryctrl *q_ctrl)
 853 {
 854         struct gspca_dev *gspca_dev = priv;
 855         int i, ix;
 856         u32 id;
 857
 858         ix = -1;
 859         id = q_ctrl->id;
 860         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 861                 id &= V4L2_CTRL_ID_MASK;
 862                 id++;
 863                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 864                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
 865                                 continue;
 866                         if (ix < 0) {
 867                                 ix = i;
 868                                 continue;
 869                         }
 870                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
 871                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
 872                                 continue;
 873                         ix = i;
 874                 }
 875         }
 876         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 877                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 878                         ix = i;
 879                         break;
 880                 }
 881         }
 882         if (ix < 0)
 883                 return -EINVAL;
 884         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
 885                 sizeof *q_ctrl);
 886         if (gspca_dev->ctrl_dis & (1 << ix))
 887                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 888         return 0;
 889 }
 890
 891 static int vidioc_s_ctrl(struct file *file, void *priv,
 892                          struct v4l2_control *ctrl)
 893 {
 894         struct gspca_dev *gspca_dev = priv;
 895         const struct ctrl *ctrls;
 896         int i, ret;
 897
 898         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 899              i < gspca_dev->sd_desc->nctrls;
 900              i++, ctrls++) {
 901                 if (ctrl->id != ctrls->qctrl.id)
 902                         continue;
 903                 if (gspca_dev->ctrl_dis & (1 << i))
 904                         return -EINVAL;
 905                 if (ctrl->value < ctrls->qctrl.minimum
 906                     || ctrl->value > ctrls->qctrl.maximum)
 907                         return -ERANGE;
 908                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
 909                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 910                         return -ERESTARTSYS;
 911                 ret = ctrls->set(gspca_dev, ctrl->value);
 912                 mutex_unlock(&gspca_dev->usb_lock);
 913                 return ret;
 914         }
 915         return -EINVAL;
 916 }
 917
 918 static int vidioc_g_ctrl(struct file *file, void *priv,
 919                          struct v4l2_control *ctrl)
 920 {
 921         struct gspca_dev *gspca_dev = priv;
 922
 923         const struct ctrl *ctrls;
 924         int i, ret;
 925
 926         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 927              i < gspca_dev->sd_desc->nctrls;
 928              i++, ctrls++) {
 929                 if (ctrl->id != ctrls->qctrl.id)
 930                         continue;
 931                 if (gspca_dev->ctrl_dis & (1 << i))
 932                         return -EINVAL;
 933                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 934                         return -ERESTARTSYS;
 935                 ret = ctrls->get(gspca_dev, &ctrl->value);
 936                 mutex_unlock(&gspca_dev->usb_lock);
 937                 return ret;
 938         }
 939         return -EINVAL;
 940 }
 941
 942 static int vidioc_querymenu(struct file *file, void *priv,
 943                             struct v4l2_querymenu *qmenu)
 944 {
 945         struct gspca_dev *gspca_dev = priv;
 946
 947         if (!gspca_dev->sd_desc->querymenu)
 948                 return -EINVAL;
 949         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
 950 }
 951
 952 static int vidioc_enum_input(struct file *file, void *priv,
 953                                 struct v4l2_input *input)
 954 {
 955         struct gspca_dev *gspca_dev = priv;
 956
 957         if (input->index != 0)
 958                 return -EINVAL;
 959         memset(input, 0, sizeof *input);
 960         input->type = V4L2_INPUT_TYPE_CAMERA;
 961         strncpy(input->name, gspca_dev->sd_desc->name,
 962                 sizeof input->name);
 963         return 0;
 964 }
 965
 966 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 967 {
 968         *i = 0;
 969         return 0;
 970 }
 971
 972 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 973 {
 974         if (i > 0)
 975                 return -EINVAL;
 976         return (0);
 977 }
 978
 979 static int vidioc_reqbufs(struct file *file, void *priv,
 980                           struct v4l2_requestbuffers *rb)
 981 {
 982         struct gspca_dev *gspca_dev = priv;
 983         int i, ret = 0;
 984
 985         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 986                 return -EINVAL;
 987         switch (rb->memory) {
 988         case GSPCA_MEMORY_READ:                 /* (internal call) */
 989         case V4L2_MEMORY_MMAP:
 990         case V4L2_MEMORY_USERPTR:
 991                 break;
 992         default:
 993                 return -EINVAL;
 994         }
 995         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 996                 return -ERESTARTSYS;
 997
 998         if (gspca_dev->memory != GSPCA_MEMORY_NO
 999             && gspca_dev->memory != rb->memory) {
1000                 ret = -EBUSY;
1001                 goto out;
1002         }
1003
1004         /* only one file may do the capture */
1005         if (gspca_dev->capt_file != NULL
1006             && gspca_dev->capt_file != file) {
1007                 ret = -EBUSY;
1008                 goto out;
1009         }
1010
1011         /* if allocated, the buffers must not be mapped */
1012         for (i = 0; i < gspca_dev->nframes; i++) {
1013                 if (gspca_dev->frame[i].vma_use_count) {
1014                         ret = -EBUSY;
1015                         goto out;
1016                 }
1017         }
1018
1019         /* stop streaming */
1020         if (gspca_dev->streaming) {
1021                 mutex_lock(&gspca_dev->usb_lock);
1022                 gspca_stream_off(gspca_dev);
1023                 mutex_unlock(&gspca_dev->usb_lock);
1024         }
1025
1026         /* free the previous allocated buffers, if any */
1027         if (gspca_dev->nframes != 0) {
1028                 frame_free(gspca_dev);
1029                 gspca_dev->capt_file = NULL;
1030         }
1031         if (rb->count == 0)                     /* unrequest */
1032                 goto out;
1033         gspca_dev->memory = rb->memory;
1034         ret = frame_alloc(gspca_dev, rb->count);
1035         if (ret == 0) {
1036                 rb->count = gspca_dev->nframes;
1037                 gspca_dev->capt_file = file;
1038         }
1039 out:
1040         mutex_unlock(&gspca_dev->queue_lock);
1041         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1042         return ret;
1043 }
1044
1045 static int vidioc_querybuf(struct file *file, void *priv,
1046                            struct v4l2_buffer *v4l2_buf)
1047 {
1048         struct gspca_dev *gspca_dev = priv;
1049         struct gspca_frame *frame;
1050
1051         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1052             || v4l2_buf->index < 0
1053             || v4l2_buf->index >= gspca_dev->nframes)
1054                 return -EINVAL;
1055
1056         frame = &gspca_dev->frame[v4l2_buf->index];
1057         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1058         return 0;
1059 }
1060
1061 static int vidioc_streamon(struct file *file, void *priv,
1062                            enum v4l2_buf_type buf_type)
1063 {
1064         struct gspca_dev *gspca_dev = priv;
1065         int ret;
1066
1067         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1068                 return -EINVAL;
1069         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1070                 return -ERESTARTSYS;
1071         if (!gspca_dev->present) {
1072                 ret = -ENODEV;
1073                 goto out;
1074         }
1075         if (gspca_dev->nframes == 0) {
1076                 ret = -EINVAL;
1077                 goto out;
1078         }
1079         if (!gspca_dev->streaming) {
1080                 ret = gspca_init_transfer(gspca_dev);
1081                 if (ret < 0)
1082                         goto out;
1083         }
1084 #ifdef GSPCA_DEBUG
1085         if (gspca_debug & D_STREAM) {
1086                 PDEBUG_MODE("stream on OK",
1087                         gspca_dev->pixfmt,
1088                         gspca_dev->width,
1089                         gspca_dev->height);
1090         }
1091 #endif
1092         ret = 0;
1093 out:
1094         mutex_unlock(&gspca_dev->queue_lock);
1095         return ret;
1096 }
1097
1098 static int vidioc_streamoff(struct file *file, void *priv,
1099                                 enum v4l2_buf_type buf_type)
1100 {
1101         struct gspca_dev *gspca_dev = priv;
1102         int i, ret;
1103
1104         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1105                 return -EINVAL;
1106         if (!gspca_dev->streaming)
1107                 return 0;
1108         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1109                 return -ERESTARTSYS;
1110
1111         /* stop streaming */
1112         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1113                 ret = -ERESTARTSYS;
1114                 goto out;
1115         }
1116         gspca_stream_off(gspca_dev);
1117         mutex_unlock(&gspca_dev->usb_lock);
1118
1119         /* empty the application queues */
1120         for (i = 0; i < gspca_dev->nframes; i++)
1121                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1122         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1123         gspca_dev->last_packet_type = DISCARD_PACKET;
1124         gspca_dev->sequence = 0;
1125         atomic_set(&gspca_dev->nevent, 0);
1126         ret = 0;
1127 out:
1128         mutex_unlock(&gspca_dev->queue_lock);
1129         return ret;
1130 }
1131
1132 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1133                         struct v4l2_jpegcompression *jpegcomp)
1134 {
1135         struct gspca_dev *gspca_dev = priv;
1136         int ret;
1137
1138         if (!gspca_dev->sd_desc->get_jcomp)
1139                 return -EINVAL;
1140         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1141                 return -ERESTARTSYS;
1142         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1143         mutex_unlock(&gspca_dev->usb_lock);
1144         return ret;
1145 }
1146
1147 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1148                         struct v4l2_jpegcompression *jpegcomp)
1149 {
1150         struct gspca_dev *gspca_dev = priv;
1151         int ret;
1152
1153         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1154                 return -ERESTARTSYS;
1155         if (!gspca_dev->sd_desc->set_jcomp)
1156                 return -EINVAL;
1157         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1158         mutex_unlock(&gspca_dev->usb_lock);
1159         return ret;
1160 }
1161
1162 static int vidioc_g_parm(struct file *filp, void *priv,
1163                         struct v4l2_streamparm *parm)
1164 {
1165         struct gspca_dev *gspca_dev = priv;
1166
1167         memset(parm, 0, sizeof *parm);
1168         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1169         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1170         return 0;
1171 }
1172
1173 static int vidioc_s_parm(struct file *filp, void *priv,
1174                         struct v4l2_streamparm *parm)
1175 {
1176         struct gspca_dev *gspca_dev = priv;
1177         int n;
1178
1179         n = parm->parm.capture.readbuffers;
1180         if (n == 0 || n > GSPCA_MAX_FRAMES)
1181                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1182         else
1183                 gspca_dev->nbufread = n;
1184         return 0;
1185 }
1186
1187 static int vidioc_s_std(struct file *filp, void *priv,
1188                         v4l2_std_id *parm)
1189 {
1190         return 0;
1191 }
1192
1193 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1194 static int vidiocgmbuf(struct file *file, void *priv,
1195                         struct video_mbuf *mbuf)
1196 {
1197         struct gspca_dev *gspca_dev = file->private_data;
1198         int i;
1199
1200         PDEBUG(D_STREAM, "cgmbuf");
1201         if (gspca_dev->nframes == 0) {
1202                 int ret;
1203
1204                 {
1205                         struct v4l2_format fmt;
1206
1207                         memset(&fmt, 0, sizeof fmt);
1208                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1209                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1210                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1211                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1212                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1213                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1214                         if (ret != 0)
1215                                 return ret;
1216                 }
1217                 {
1218                         struct v4l2_requestbuffers rb;
1219
1220                         memset(&rb, 0, sizeof rb);
1221                         rb.count = 4;
1222                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1223                         rb.memory = V4L2_MEMORY_MMAP;
1224                         ret = vidioc_reqbufs(file, priv, &rb);
1225                         if (ret != 0)
1226                                 return ret;
1227                 }
1228         }
1229         mbuf->frames = gspca_dev->nframes;
1230         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1231         for (i = 0; i < mbuf->frames; i++)
1232                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1233         return 0;
1234 }
1235 #endif
1236
1237 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1238 {
1239         struct gspca_dev *gspca_dev = file->private_data;
1240         struct gspca_frame *frame;
1241         struct page *page;
1242         unsigned long addr, start, size;
1243         int i, ret;
1244
1245         start = vma->vm_start;
1246         size = vma->vm_end - vma->vm_start;
1247         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1248
1249         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1250                 return -ERESTARTSYS;
1251         if (!gspca_dev->present) {
1252                 ret = -ENODEV;
1253                 goto out;
1254         }
1255         if (gspca_dev->capt_file != file) {
1256                 ret = -EINVAL;
1257                 goto out;
1258         }
1259
1260         frame = NULL;
1261         for (i = 0; i < gspca_dev->nframes; ++i) {
1262                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1263                         PDEBUG(D_STREAM, "mmap bad memory type");
1264                         break;
1265                 }
1266                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1267                                                 == vma->vm_pgoff) {
1268                         frame = &gspca_dev->frame[i];
1269                         break;
1270                 }
1271         }
1272         if (frame == NULL) {
1273                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1274                 ret = -EINVAL;
1275                 goto out;
1276         }
1277 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1278         /* v4l1 maps all the buffers */
1279         if (i != 0
1280             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1281 #endif
1282             if (size != frame->v4l2_buf.length) {
1283                 PDEBUG(D_STREAM, "mmap bad size");
1284                 ret = -EINVAL;
1285                 goto out;
1286         }
1287
1288         /*
1289          * - VM_IO marks the area as being a mmaped region for I/O to a
1290          *   device. It also prevents the region from being core dumped.
1291          */
1292         vma->vm_flags |= VM_IO;
1293
1294         addr = (unsigned long) frame->data;
1295         while (size > 0) {
1296                 page = vmalloc_to_page((void *) addr);
1297                 ret = vm_insert_page(vma, start, page);
1298                 if (ret < 0)
1299                         goto out;
1300                 start += PAGE_SIZE;
1301                 addr += PAGE_SIZE;
1302                 size -= PAGE_SIZE;
1303         }
1304
1305         vma->vm_ops = &gspca_vm_ops;
1306         vma->vm_private_data = frame;
1307         gspca_vm_open(vma);
1308         ret = 0;
1309 out:
1310         mutex_unlock(&gspca_dev->queue_lock);
1311         return ret;
1312 }
1313
1314 /*
1315  * wait for a video frame
1316  *
1317  * If a frame is ready, its index is returned.
1318  */
1319 static int frame_wait(struct gspca_dev *gspca_dev,
1320                         int nonblock_ing)
1321 {
1322         struct gspca_frame *frame;
1323         int i, j, ret;
1324
1325         /* check if a frame is ready */
1326         i = gspca_dev->fr_o;
1327         j = gspca_dev->fr_queue[i];
1328         frame = &gspca_dev->frame[j];
1329         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1330                 atomic_dec(&gspca_dev->nevent);
1331                 goto ok;
1332         }
1333         if (nonblock_ing)                       /* no frame yet */
1334                 return -EAGAIN;
1335
1336         /* wait till a frame is ready */
1337         for (;;) {
1338                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1339                                         atomic_read(&gspca_dev->nevent) > 0,
1340                                         msecs_to_jiffies(3000));
1341                 if (ret <= 0) {
1342                         if (ret < 0)
1343                                 return ret;     /* interrupt */
1344                         return -EIO;            /* timeout */
1345                 }
1346                 atomic_dec(&gspca_dev->nevent);
1347                 if (!gspca_dev->streaming || !gspca_dev->present)
1348                         return -EIO;
1349                 i = gspca_dev->fr_o;
1350                 j = gspca_dev->fr_queue[i];
1351                 frame = &gspca_dev->frame[j];
1352                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1353                         break;
1354         }
1355 ok:
1356         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1357         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1358                 gspca_dev->fr_q,
1359                 gspca_dev->fr_i,
1360                 gspca_dev->fr_o);
1361
1362         if (gspca_dev->sd_desc->dq_callback) {
1363                 mutex_lock(&gspca_dev->usb_lock);
1364                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1365                 mutex_unlock(&gspca_dev->usb_lock);
1366         }
1367         return j;
1368 }
1369
1370 /*
1371  * dequeue a video buffer
1372  *
1373  * If nonblock_ing is false, block until a buffer is available.
1374  */
1375 static int vidioc_dqbuf(struct file *file, void *priv,
1376                         struct v4l2_buffer *v4l2_buf)
1377 {
1378         struct gspca_dev *gspca_dev = priv;
1379         struct gspca_frame *frame;
1380         int i, ret;
1381
1382         PDEBUG(D_FRAM, "dqbuf");
1383         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1384                 return -EINVAL;
1385         if (v4l2_buf->memory != gspca_dev->memory)
1386                 return -EINVAL;
1387
1388         /* if not streaming, be sure the application will not loop forever */
1389         if (!(file->f_flags & O_NONBLOCK)
1390             && !gspca_dev->streaming && gspca_dev->users == 1)
1391                 return -EINVAL;
1392
1393         /* only the capturing file may dequeue */
1394         if (gspca_dev->capt_file != file)
1395                 return -EINVAL;
1396
1397         /* only one dequeue / read at a time */
1398         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1399                 return -ERESTARTSYS;
1400
1401         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1402         if (ret < 0)
1403                 goto out;
1404         i = ret;                                /* frame index */
1405         frame = &gspca_dev->frame[i];
1406         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1407                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1408                                  frame->data,
1409                                  frame->v4l2_buf.bytesused)) {
1410                         PDEBUG(D_ERR|D_STREAM,
1411                                 "dqbuf cp to user failed");
1412                         ret = -EFAULT;
1413                         goto out;
1414                 }
1415         }
1416         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1417         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1418         PDEBUG(D_FRAM, "dqbuf %d", i);
1419         ret = 0;
1420 out:
1421         mutex_unlock(&gspca_dev->read_lock);
1422         return ret;
1423 }
1424
1425 /*
1426  * queue a video buffer
1427  *
1428  * Attempting to queue a buffer that has already been
1429  * queued will return -EINVAL.
1430  */
1431 static int vidioc_qbuf(struct file *file, void *priv,
1432                         struct v4l2_buffer *v4l2_buf)
1433 {
1434         struct gspca_dev *gspca_dev = priv;
1435         struct gspca_frame *frame;
1436         int i, index, ret;
1437
1438         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1439         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1440                 return -EINVAL;
1441
1442         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1443                 return -ERESTARTSYS;
1444
1445         index = v4l2_buf->index;
1446         if ((unsigned) index >= gspca_dev->nframes) {
1447                 PDEBUG(D_FRAM,
1448                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1449                 ret = -EINVAL;
1450                 goto out;
1451         }
1452         if (v4l2_buf->memory != gspca_dev->memory) {
1453                 PDEBUG(D_FRAM, "qbuf bad memory type");
1454                 ret = -EINVAL;
1455                 goto out;
1456         }
1457
1458         frame = &gspca_dev->frame[index];
1459         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1460                 PDEBUG(D_FRAM, "qbuf bad state");
1461                 ret = -EINVAL;
1462                 goto out;
1463         }
1464
1465         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1466 /*      frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1467
1468         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1469                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1470                 frame->v4l2_buf.length = v4l2_buf->length;
1471         }
1472
1473         /* put the buffer in the 'queued' queue */
1474         i = gspca_dev->fr_q;
1475         gspca_dev->fr_queue[i] = index;
1476         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1477         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1478                 gspca_dev->fr_q,
1479                 gspca_dev->fr_i,
1480                 gspca_dev->fr_o);
1481
1482         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1483         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1484         ret = 0;
1485 out:
1486         mutex_unlock(&gspca_dev->queue_lock);
1487         return ret;
1488 }
1489
1490 /*
1491  * allocate the resources for read()
1492  */
1493 static int read_alloc(struct gspca_dev *gspca_dev,
1494                         struct file *file)
1495 {
1496         struct v4l2_buffer v4l2_buf;
1497         int i, ret;
1498
1499         PDEBUG(D_STREAM, "read alloc");
1500         if (gspca_dev->nframes == 0) {
1501                 struct v4l2_requestbuffers rb;
1502
1503                 memset(&rb, 0, sizeof rb);
1504                 rb.count = gspca_dev->nbufread;
1505                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1506                 rb.memory = GSPCA_MEMORY_READ;
1507                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1508                 if (ret != 0) {
1509                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1510                         return ret;
1511                 }
1512                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1513                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1514                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1515                 for (i = 0; i < gspca_dev->nbufread; i++) {
1516                         v4l2_buf.index = i;
1517                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1518                         if (ret != 0) {
1519                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1520                                 return ret;
1521                         }
1522                 }
1523                 gspca_dev->memory = GSPCA_MEMORY_READ;
1524         }
1525
1526         /* start streaming */
1527         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1528         if (ret != 0)
1529                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1530         return ret;
1531 }
1532
1533 static unsigned int dev_poll(struct file *file, poll_table *wait)
1534 {
1535         struct gspca_dev *gspca_dev = file->private_data;
1536         int i, ret;
1537
1538         PDEBUG(D_FRAM, "poll");
1539
1540         poll_wait(file, &gspca_dev->wq, wait);
1541         if (!gspca_dev->present)
1542                 return POLLERR;
1543
1544         /* if reqbufs is not done, the user would use read() */
1545         if (gspca_dev->nframes == 0) {
1546                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1547                         return POLLERR;         /* not the 1st time */
1548                 ret = read_alloc(gspca_dev, file);
1549                 if (ret != 0)
1550                         return POLLERR;
1551         }
1552
1553         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1554                 return POLLERR;
1555         if (!gspca_dev->present) {
1556                 ret = POLLERR;
1557                 goto out;
1558         }
1559
1560         /* check the next incoming buffer */
1561         i = gspca_dev->fr_o;
1562         i = gspca_dev->fr_queue[i];
1563         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1564                 ret = POLLIN | POLLRDNORM;      /* something to read */
1565         else
1566                 ret = 0;
1567 out:
1568         mutex_unlock(&gspca_dev->queue_lock);
1569         return ret;
1570 }
1571
1572 static ssize_t dev_read(struct file *file, char __user *data,
1573                     size_t count, loff_t *ppos)
1574 {
1575         struct gspca_dev *gspca_dev = file->private_data;
1576         struct gspca_frame *frame;
1577         struct v4l2_buffer v4l2_buf;
1578         struct timeval timestamp;
1579         int n, ret, ret2;
1580
1581         PDEBUG(D_FRAM, "read (%zd)", count);
1582         if (!gspca_dev->present)
1583                 return -ENODEV;
1584         switch (gspca_dev->memory) {
1585         case GSPCA_MEMORY_NO:                   /* first time */
1586                 ret = read_alloc(gspca_dev, file);
1587                 if (ret != 0)
1588                         return ret;
1589                 break;
1590         case GSPCA_MEMORY_READ:
1591                 if (gspca_dev->capt_file == file)
1592                         break;
1593                 /* fall thru */
1594         default:
1595                 return -EINVAL;
1596         }
1597
1598         /* get a frame */
1599         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1600         timestamp.tv_sec--;
1601         n = 2;
1602         for (;;) {
1603                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1604                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1605                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1606                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1607                 if (ret != 0) {
1608                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1609                         return ret;
1610                 }
1611
1612                 /* if the process slept for more than 1 second,
1613                  * get anewer frame */
1614                 frame = &gspca_dev->frame[v4l2_buf.index];
1615                 if (--n < 0)
1616                         break;                  /* avoid infinite loop */
1617                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1618                         break;
1619                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1620                 if (ret != 0) {
1621                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1622                         return ret;
1623                 }
1624         }
1625
1626         /* copy the frame */
1627         if (count > frame->v4l2_buf.bytesused)
1628                 count = frame->v4l2_buf.bytesused;
1629         ret = copy_to_user(data, frame->data, count);
1630         if (ret != 0) {
1631                 PDEBUG(D_ERR|D_STREAM,
1632                         "read cp to user lack %d / %zd", ret, count);
1633                 ret = -EFAULT;
1634                 goto out;
1635         }
1636         ret = count;
1637 out:
1638         /* in each case, requeue the buffer */
1639         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1640         if (ret2 != 0)
1641                 return ret2;
1642         return ret;
1643 }
1644
1645 static void dev_release(struct video_device *vfd)
1646 {
1647         /* nothing */
1648 }
1649
1650 static struct file_operations dev_fops = {
1651         .owner = THIS_MODULE,
1652         .open = dev_open,
1653         .release = dev_close,
1654         .read = dev_read,
1655         .mmap = dev_mmap,
1656         .ioctl = video_ioctl2,
1657 #ifdef CONFIG_COMPAT
1658         .compat_ioctl = v4l_compat_ioctl32,
1659 #endif
1660         .llseek = no_llseek,
1661         .poll   = dev_poll,
1662 };
1663
1664 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1665         .vidioc_querycap        = vidioc_querycap,
1666         .vidioc_dqbuf           = vidioc_dqbuf,
1667         .vidioc_qbuf            = vidioc_qbuf,
1668         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1669         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1670         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1671         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1672         .vidioc_streamon        = vidioc_streamon,
1673         .vidioc_queryctrl       = vidioc_queryctrl,
1674         .vidioc_g_ctrl          = vidioc_g_ctrl,
1675         .vidioc_s_ctrl          = vidioc_s_ctrl,
1676         .vidioc_querymenu       = vidioc_querymenu,
1677         .vidioc_enum_input      = vidioc_enum_input,
1678         .vidioc_g_input         = vidioc_g_input,
1679         .vidioc_s_input         = vidioc_s_input,
1680         .vidioc_reqbufs         = vidioc_reqbufs,
1681         .vidioc_querybuf        = vidioc_querybuf,
1682         .vidioc_streamoff       = vidioc_streamoff,
1683         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1684         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1685         .vidioc_g_parm          = vidioc_g_parm,
1686         .vidioc_s_parm          = vidioc_s_parm,
1687         .vidioc_s_std           = vidioc_s_std,
1688 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1689         .vidiocgmbuf          = vidiocgmbuf,
1690 #endif
1691 };
1692
1693 static struct video_device gspca_template = {
1694         .name = "gspca main driver",
1695         .fops = &dev_fops,
1696         .ioctl_ops = &dev_ioctl_ops,
1697         .release = dev_release,         /* mandatory */
1698         .minor = -1,
1699 };
1700
1701 /*
1702  * probe and create a new gspca device
1703  *
1704  * This function must be called by the sub-driver when it is
1705  * called for probing a new device.
1706  */
1707 int gspca_dev_probe(struct usb_interface *intf,
1708                 const struct usb_device_id *id,
1709                 const struct sd_desc *sd_desc,
1710                 int dev_size,
1711                 struct module *module)
1712 {
1713         struct usb_interface_descriptor *interface;
1714         struct gspca_dev *gspca_dev;
1715         struct usb_device *dev = interface_to_usbdev(intf);
1716         int ret;
1717
1718         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1719
1720         /* we don't handle multi-config cameras */
1721         if (dev->descriptor.bNumConfigurations != 1)
1722                 return -ENODEV;
1723         interface = &intf->cur_altsetting->desc;
1724         if (interface->bInterfaceNumber > 0)
1725                 return -ENODEV;
1726
1727         /* create the device */
1728         if (dev_size < sizeof *gspca_dev)
1729                 dev_size = sizeof *gspca_dev;
1730         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1731         if (gspca_dev == NULL) {
1732                 err("couldn't kzalloc gspca struct");
1733                 return -EIO;
1734         }
1735         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1736         if (!gspca_dev->usb_buf) {
1737                 err("out of memory");
1738                 ret = -EIO;
1739                 goto out;
1740         }
1741         gspca_dev->dev = dev;
1742         gspca_dev->iface = interface->bInterfaceNumber;
1743         gspca_dev->nbalt = intf->num_altsetting;
1744         gspca_dev->sd_desc = sd_desc;
1745 /*      gspca_dev->users = 0;                   (done by kzalloc) */
1746         gspca_dev->nbufread = 2;
1747
1748         /* configure the subdriver and initialize the USB device */
1749         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1750         if (ret < 0)
1751                 goto out;
1752         ret = gspca_dev->sd_desc->init(gspca_dev);
1753         if (ret < 0)
1754                 goto out;
1755         ret = gspca_set_alt0(gspca_dev);
1756         if (ret < 0)
1757                 goto out;
1758         gspca_set_default_mode(gspca_dev);
1759
1760         mutex_init(&gspca_dev->usb_lock);
1761         mutex_init(&gspca_dev->read_lock);
1762         mutex_init(&gspca_dev->queue_lock);
1763         init_waitqueue_head(&gspca_dev->wq);
1764
1765         /* init video stuff */
1766         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1767         gspca_dev->vdev.parent = &dev->dev;
1768         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1769         gspca_dev->vdev.fops = &gspca_dev->fops;
1770         gspca_dev->fops.owner = module;         /* module protection */
1771         gspca_dev->present = 1;
1772         ret = video_register_device(&gspca_dev->vdev,
1773                                   VFL_TYPE_GRABBER,
1774                                   video_nr);
1775         if (ret < 0) {
1776                 err("video_register_device err %d", ret);
1777                 goto out;
1778         }
1779
1780         usb_set_intfdata(intf, gspca_dev);
1781         PDEBUG(D_PROBE, "probe ok");
1782         return 0;
1783 out:
1784         kfree(gspca_dev->usb_buf);
1785         kfree(gspca_dev);
1786         return ret;
1787 }
1788 EXPORT_SYMBOL(gspca_dev_probe);
1789
1790 /*
1791  * USB disconnection
1792  *
1793  * This function must be called by the sub-driver
1794  * when the device disconnects, after the specific resources are freed.
1795  */
1796 void gspca_disconnect(struct usb_interface *intf)
1797 {
1798         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1799
1800         if (!gspca_dev)
1801                 return;
1802         gspca_dev->present = 0;
1803         mutex_lock(&gspca_dev->queue_lock);
1804         mutex_lock(&gspca_dev->usb_lock);
1805         gspca_dev->streaming = 0;
1806         destroy_urbs(gspca_dev);
1807         mutex_unlock(&gspca_dev->usb_lock);
1808         mutex_unlock(&gspca_dev->queue_lock);
1809         while (gspca_dev->users != 0) {         /* wait until fully closed */
1810                 atomic_inc(&gspca_dev->nevent);
1811                 wake_up_interruptible(&gspca_dev->wq);  /* wake processes */
1812                 schedule();
1813         }
1814 /* We don't want people trying to open up the device */
1815         video_unregister_device(&gspca_dev->vdev);
1816 /* Free the memory */
1817         kfree(gspca_dev->usb_buf);
1818         kfree(gspca_dev);
1819         PDEBUG(D_PROBE, "disconnect complete");
1820 }
1821 EXPORT_SYMBOL(gspca_disconnect);
1822
1823 #ifdef CONFIG_PM
1824 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1825 {
1826         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1827
1828         if (!gspca_dev->streaming)
1829                 return 0;
1830         gspca_dev->frozen = 1;          /* avoid urb error messages */
1831         if (gspca_dev->sd_desc->stopN)
1832                 gspca_dev->sd_desc->stopN(gspca_dev);
1833         destroy_urbs(gspca_dev);
1834         gspca_set_alt0(gspca_dev);
1835         if (gspca_dev->sd_desc->stop0)
1836                 gspca_dev->sd_desc->stop0(gspca_dev);
1837         return 0;
1838 }
1839 EXPORT_SYMBOL(gspca_suspend);
1840
1841 int gspca_resume(struct usb_interface *intf)
1842 {
1843         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1844
1845         gspca_dev->frozen = 0;
1846         gspca_dev->sd_desc->init(gspca_dev);
1847         if (gspca_dev->streaming)
1848                 return gspca_init_transfer(gspca_dev);
1849         return 0;
1850 }
1851 EXPORT_SYMBOL(gspca_resume);
1852 #endif
1853 /* -- cam driver utility functions -- */
1854
1855 /* auto gain and exposure algorithm based on the knee algorithm described here:
1856    http://ytse.tricolour.net/docs/LowLightOptimization.html
1857
1858    Returns 0 if no changes were made, 1 if the gain and or exposure settings
1859    where changed. */
1860 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1861         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1862 {
1863         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1864         const struct ctrl *gain_ctrl = NULL;
1865         const struct ctrl *exposure_ctrl = NULL;
1866         const struct ctrl *autogain_ctrl = NULL;
1867         int retval = 0;
1868
1869         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1870                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1871                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1872                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1873                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1874                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1875                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1876         }
1877         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1878                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1879                         "on cam without (auto)gain/exposure");
1880                 return 0;
1881         }
1882
1883         if (gain_ctrl->get(gspca_dev, &gain) ||
1884                         exposure_ctrl->get(gspca_dev, &exposure) ||
1885                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1886                 return 0;
1887
1888         orig_gain = gain;
1889         orig_exposure = exposure;
1890
1891         /* If we are of a multiple of deadzone, do multiple steps to reach the
1892            desired lumination fast (with the risc of a slight overshoot) */
1893         steps = abs(desired_avg_lum - avg_lum) / deadzone;
1894
1895         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1896                 avg_lum, desired_avg_lum, steps);
1897
1898         for (i = 0; i < steps; i++) {
1899                 if (avg_lum > desired_avg_lum) {
1900                         if (gain > gain_knee)
1901                                 gain--;
1902                         else if (exposure > exposure_knee)
1903                                 exposure--;
1904                         else if (gain > gain_ctrl->qctrl.default_value)
1905                                 gain--;
1906                         else if (exposure > exposure_ctrl->qctrl.minimum)
1907                                 exposure--;
1908                         else if (gain > gain_ctrl->qctrl.minimum)
1909                                 gain--;
1910                         else
1911                                 break;
1912                 } else {
1913                         if (gain < gain_ctrl->qctrl.default_value)
1914                                 gain++;
1915                         else if (exposure < exposure_knee)
1916                                 exposure++;
1917                         else if (gain < gain_knee)
1918                                 gain++;
1919                         else if (exposure < exposure_ctrl->qctrl.maximum)
1920                                 exposure++;
1921                         else if (gain < gain_ctrl->qctrl.maximum)
1922                                 gain++;
1923                         else
1924                                 break;
1925                 }
1926         }
1927
1928         if (gain != orig_gain) {
1929                 gain_ctrl->set(gspca_dev, gain);
1930                 retval = 1;
1931         }
1932         if (exposure != orig_exposure) {
1933                 exposure_ctrl->set(gspca_dev, exposure);
1934                 retval = 1;
1935         }
1936
1937         return retval;
1938 }
1939 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
1940
1941 /* -- module insert / remove -- */
1942 static int __init gspca_init(void)
1943 {
1944         info("main v%d.%d.%d registered",
1945                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
1946                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
1947                 DRIVER_VERSION_NUMBER & 0xff);
1948         return 0;
1949 }
1950 static void __exit gspca_exit(void)
1951 {
1952         info("main deregistered");
1953 }
1954
1955 module_init(gspca_init);
1956 module_exit(gspca_exit);
1957
1958 #ifdef GSPCA_DEBUG
1959 module_param_named(debug, gspca_debug, int, 0644);
1960 MODULE_PARM_DESC(debug,
1961                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
1962                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
1963                 " 0x0100: v4l2");
1964 #endif