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