drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/ktime.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 9, 0)
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         PDEBUG(D_ERR, "Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         PDEBUG(D_ERR, "Input device registration failed "
 181                                 "with error %i", err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_PROBE, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, buffer_len,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         gspca_dev->int_urb = urb;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PDEBUG(D_ERR, "submit URB failed with error %i", ret);
 230                 goto error_submit;
 231         }
 232         return ret;
 233
 234 error_submit:
 235         usb_free_coherent(dev,
 236                           urb->transfer_buffer_length,
 237                           urb->transfer_buffer,
 238                           urb->transfer_dma);
 239 error_buffer:
 240         usb_free_urb(urb);
 241 error:
 242         return ret;
 243 }
 244
 245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 246 {
 247         struct usb_interface *intf;
 248         struct usb_host_interface *intf_desc;
 249         struct usb_endpoint_descriptor *ep;
 250         int i;
 251
 252         if (gspca_dev->sd_desc->int_pkt_scan)  {
 253                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 254                 intf_desc = intf->cur_altsetting;
 255                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 256                         ep = &intf_desc->endpoint[i].desc;
 257                         if (usb_endpoint_dir_in(ep) &&
 258                             usb_endpoint_xfer_int(ep)) {
 259
 260                                 alloc_and_submit_int_urb(gspca_dev, ep);
 261                                 break;
 262                         }
 263                 }
 264         }
 265 }
 266
 267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 268 {
 269         struct urb *urb;
 270
 271         urb = gspca_dev->int_urb;
 272         if (urb) {
 273                 gspca_dev->int_urb = NULL;
 274                 usb_kill_urb(urb);
 275                 usb_free_coherent(gspca_dev->dev,
 276                                   urb->transfer_buffer_length,
 277                                   urb->transfer_buffer,
 278                                   urb->transfer_dma);
 279                 usb_free_urb(urb);
 280         }
 281 }
 282 #else
 283 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 284 {
 285 }
 286
 287 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 288 {
 289 }
 290
 291 static inline int gspca_input_connect(struct gspca_dev *dev)
 292 {
 293         return 0;
 294 }
 295 #endif
 296
 297 /* get the current input frame buffer */
 298 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
 299 {
 300         struct gspca_frame *frame;
 301
 302         frame = gspca_dev->cur_frame;
 303         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 304                                 != V4L2_BUF_FLAG_QUEUED)
 305                 return NULL;
 306         return frame;
 307 }
 308 EXPORT_SYMBOL(gspca_get_i_frame);
 309
 310 /*
 311  * fill a video frame from an URB and resubmit
 312  */
 313 static void fill_frame(struct gspca_dev *gspca_dev,
 314                         struct urb *urb)
 315 {
 316         u8 *data;               /* address of data in the iso message */
 317         int i, len, st;
 318         cam_pkt_op pkt_scan;
 319
 320         if (urb->status != 0) {
 321                 if (urb->status == -ESHUTDOWN)
 322                         return;         /* disconnection */
 323 #ifdef CONFIG_PM
 324                 if (gspca_dev->frozen)
 325                         return;
 326 #endif
 327                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 328                 urb->status = 0;
 329                 goto resubmit;
 330         }
 331         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 332         for (i = 0; i < urb->number_of_packets; i++) {
 333
 334                 /* check the packet status and length */
 335                 len = urb->iso_frame_desc[i].actual_length;
 336                 if (len == 0) {
 337                         if (gspca_dev->empty_packet == 0)
 338                                 gspca_dev->empty_packet = 1;
 339                         continue;
 340                 }
 341                 st = urb->iso_frame_desc[i].status;
 342                 if (st) {
 343                         PDEBUG(D_ERR,
 344                                 "ISOC data error: [%d] len=%d, status=%d",
 345                                 i, len, st);
 346                         gspca_dev->last_packet_type = DISCARD_PACKET;
 347                         continue;
 348                 }
 349
 350                 /* let the packet be analyzed by the subdriver */
 351                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 352                         i, urb->iso_frame_desc[i].offset, len);
 353                 data = (u8 *) urb->transfer_buffer
 354                                         + urb->iso_frame_desc[i].offset;
 355                 pkt_scan(gspca_dev, data, len);
 356         }
 357
 358 resubmit:
 359         /* resubmit the URB */
 360         st = usb_submit_urb(urb, GFP_ATOMIC);
 361         if (st < 0)
 362                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 363 }
 364
 365 /*
 366  * ISOC message interrupt from the USB device
 367  *
 368  * Analyse each packet and call the subdriver for copy to the frame buffer.
 369  */
 370 static void isoc_irq(struct urb *urb)
 371 {
 372         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 373
 374         PDEBUG(D_PACK, "isoc irq");
 375         if (!gspca_dev->streaming)
 376                 return;
 377         fill_frame(gspca_dev, urb);
 378 }
 379
 380 /*
 381  * bulk message interrupt from the USB device
 382  */
 383 static void bulk_irq(struct urb *urb)
 384 {
 385         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 386         int st;
 387
 388         PDEBUG(D_PACK, "bulk irq");
 389         if (!gspca_dev->streaming)
 390                 return;
 391         switch (urb->status) {
 392         case 0:
 393                 break;
 394         case -ESHUTDOWN:
 395                 return;         /* disconnection */
 396         default:
 397 #ifdef CONFIG_PM
 398                 if (gspca_dev->frozen)
 399                         return;
 400 #endif
 401                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 402                 urb->status = 0;
 403                 goto resubmit;
 404         }
 405
 406         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 407         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 408                                 urb->transfer_buffer,
 409                                 urb->actual_length);
 410
 411 resubmit:
 412         /* resubmit the URB */
 413         if (gspca_dev->cam.bulk_nurbs != 0) {
 414                 st = usb_submit_urb(urb, GFP_ATOMIC);
 415                 if (st < 0)
 416                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 417         }
 418 }
 419
 420 /*
 421  * add data to the current frame
 422  *
 423  * This function is called by the subdrivers at interrupt level.
 424  *
 425  * To build a frame, these ones must add
 426  *      - one FIRST_PACKET
 427  *      - 0 or many INTER_PACKETs
 428  *      - one LAST_PACKET
 429  * DISCARD_PACKET invalidates the whole frame.
 430  * On LAST_PACKET, a new frame is returned.
 431  */
 432 void gspca_frame_add(struct gspca_dev *gspca_dev,
 433                         enum gspca_packet_type packet_type,
 434                         const u8 *data,
 435                         int len)
 436 {
 437         struct gspca_frame *frame;
 438         int i, j;
 439
 440         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 441
 442         /* check the availability of the frame buffer */
 443         frame = gspca_dev->cur_frame;
 444         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 445                                         != V4L2_BUF_FLAG_QUEUED) {
 446                 gspca_dev->last_packet_type = DISCARD_PACKET;
 447                 return;
 448         }
 449
 450         /* when start of a new frame, if the current frame buffer
 451          * is not queued, discard the whole frame */
 452         if (packet_type == FIRST_PACKET) {
 453                 frame->data_end = frame->data;
 454                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 455                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 456         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 457                 if (packet_type == LAST_PACKET)
 458                         gspca_dev->last_packet_type = packet_type;
 459                 return;
 460         }
 461
 462         /* append the packet to the frame buffer */
 463         if (len > 0) {
 464                 if (frame->data_end - frame->data + len
 465                                                  > frame->v4l2_buf.length) {
 466                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
 467                                 frame->data_end - frame->data + len,
 468                                 frame->v4l2_buf.length);
 469                         packet_type = DISCARD_PACKET;
 470                 } else {
 471                         memcpy(frame->data_end, data, len);
 472                         frame->data_end += len;
 473                 }
 474         }
 475         gspca_dev->last_packet_type = packet_type;
 476
 477         /* if last packet, wake up the application and advance in the queue */
 478         if (packet_type == LAST_PACKET) {
 479                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 480                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 481                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 482                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 483                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 484                 gspca_dev->fr_i = i;
 485                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 486                         frame->v4l2_buf.bytesused,
 487                         gspca_dev->fr_q,
 488                         i,
 489                         gspca_dev->fr_o);
 490                 j = gspca_dev->fr_queue[i];
 491                 gspca_dev->cur_frame = &gspca_dev->frame[j];
 492         }
 493 }
 494 EXPORT_SYMBOL(gspca_frame_add);
 495
 496 static int gspca_is_compressed(__u32 format)
 497 {
 498         switch (format) {
 499         case V4L2_PIX_FMT_MJPEG:
 500         case V4L2_PIX_FMT_JPEG:
 501         case V4L2_PIX_FMT_SPCA561:
 502         case V4L2_PIX_FMT_PAC207:
 503         case V4L2_PIX_FMT_MR97310A:
 504                 return 1;
 505         }
 506         return 0;
 507 }
 508
 509 static void *rvmalloc(long size)
 510 {
 511         void *mem;
 512         unsigned long adr;
 513
 514         mem = vmalloc_32(size);
 515         if (mem != NULL) {
 516                 adr = (unsigned long) mem;
 517                 while (size > 0) {
 518                         SetPageReserved(vmalloc_to_page((void *) adr));
 519                         adr += PAGE_SIZE;
 520                         size -= PAGE_SIZE;
 521                 }
 522         }
 523         return mem;
 524 }
 525
 526 static void rvfree(void *mem, long size)
 527 {
 528         unsigned long adr;
 529
 530         adr = (unsigned long) mem;
 531         while (size > 0) {
 532                 ClearPageReserved(vmalloc_to_page((void *) adr));
 533                 adr += PAGE_SIZE;
 534                 size -= PAGE_SIZE;
 535         }
 536         vfree(mem);
 537 }
 538
 539 static int frame_alloc(struct gspca_dev *gspca_dev,
 540                         unsigned int count)
 541 {
 542         struct gspca_frame *frame;
 543         unsigned int frsz;
 544         int i;
 545
 546         i = gspca_dev->curr_mode;
 547         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 548         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 549         frsz = PAGE_ALIGN(frsz);
 550         gspca_dev->frsz = frsz;
 551         if (count > GSPCA_MAX_FRAMES)
 552                 count = GSPCA_MAX_FRAMES;
 553         gspca_dev->frbuf = rvmalloc(frsz * count);
 554         if (!gspca_dev->frbuf) {
 555                 err("frame alloc failed");
 556                 return -ENOMEM;
 557         }
 558         gspca_dev->nframes = count;
 559         for (i = 0; i < count; i++) {
 560                 frame = &gspca_dev->frame[i];
 561                 frame->v4l2_buf.index = i;
 562                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 563                 frame->v4l2_buf.flags = 0;
 564                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 565                 frame->v4l2_buf.length = frsz;
 566                 frame->v4l2_buf.memory = gspca_dev->memory;
 567                 frame->v4l2_buf.sequence = 0;
 568                 frame->data = frame->data_end =
 569                                         gspca_dev->frbuf + i * frsz;
 570                 frame->v4l2_buf.m.offset = i * frsz;
 571         }
 572         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 573         gspca_dev->cur_frame = &gspca_dev->frame[0];
 574         gspca_dev->last_packet_type = DISCARD_PACKET;
 575         gspca_dev->sequence = 0;
 576         return 0;
 577 }
 578
 579 static void frame_free(struct gspca_dev *gspca_dev)
 580 {
 581         int i;
 582
 583         PDEBUG(D_STREAM, "frame free");
 584         if (gspca_dev->frbuf != NULL) {
 585                 rvfree(gspca_dev->frbuf,
 586                         gspca_dev->nframes * gspca_dev->frsz);
 587                 gspca_dev->frbuf = NULL;
 588                 for (i = 0; i < gspca_dev->nframes; i++)
 589                         gspca_dev->frame[i].data = NULL;
 590         }
 591         gspca_dev->nframes = 0;
 592 }
 593
 594 static void destroy_urbs(struct gspca_dev *gspca_dev)
 595 {
 596         struct urb *urb;
 597         unsigned int i;
 598
 599         PDEBUG(D_STREAM, "kill transfer");
 600         for (i = 0; i < MAX_NURBS; i++) {
 601                 urb = gspca_dev->urb[i];
 602                 if (urb == NULL)
 603                         break;
 604
 605                 gspca_dev->urb[i] = NULL;
 606                 usb_kill_urb(urb);
 607                 if (urb->transfer_buffer != NULL)
 608                         usb_free_coherent(gspca_dev->dev,
 609                                           urb->transfer_buffer_length,
 610                                           urb->transfer_buffer,
 611                                           urb->transfer_dma);
 612                 usb_free_urb(urb);
 613         }
 614 }
 615
 616 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 617 {
 618         int ret;
 619
 620         if (gspca_dev->alt == 0)
 621                 return 0;
 622         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 623         if (ret < 0)
 624                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 625         return ret;
 626 }
 627
 628 /* Note: both the queue and the usb locks should be held when calling this */
 629 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 630 {
 631         gspca_dev->streaming = 0;
 632         if (gspca_dev->present) {
 633                 if (gspca_dev->sd_desc->stopN)
 634                         gspca_dev->sd_desc->stopN(gspca_dev);
 635                 destroy_urbs(gspca_dev);
 636                 gspca_input_destroy_urb(gspca_dev);
 637                 gspca_set_alt0(gspca_dev);
 638                 gspca_input_create_urb(gspca_dev);
 639         }
 640
 641         /* always call stop0 to free the subdriver's resources */
 642         if (gspca_dev->sd_desc->stop0)
 643                 gspca_dev->sd_desc->stop0(gspca_dev);
 644         PDEBUG(D_STREAM, "stream off OK");
 645 }
 646
 647 /*
 648  * look for an input transfer endpoint in an alternate setting
 649  */
 650 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 651                                           int xfer)
 652 {
 653         struct usb_host_endpoint *ep;
 654         int i, attr;
 655
 656         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 657                 ep = &alt->endpoint[i];
 658                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 659                 if (attr == xfer
 660                     && ep->desc.wMaxPacketSize != 0)
 661                         return ep;
 662         }
 663         return NULL;
 664 }
 665
 666 /*
 667  * look for an input (isoc or bulk) endpoint
 668  *
 669  * The endpoint is defined by the subdriver.
 670  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 671  * This routine may be called many times when the bandwidth is too small
 672  * (the bandwidth is checked on urb submit).
 673  */
 674 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 675 {
 676         struct usb_interface *intf;
 677         struct usb_host_endpoint *ep;
 678         int xfer, i, ret;
 679
 680         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 681         ep = NULL;
 682         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 683                                    : USB_ENDPOINT_XFER_ISOC;
 684         i = gspca_dev->alt;                     /* previous alt setting */
 685         if (gspca_dev->cam.reverse_alts) {
 686                 while (++i < gspca_dev->nbalt) {
 687                         ep = alt_xfer(&intf->altsetting[i], xfer);
 688                         if (ep)
 689                                 break;
 690                 }
 691         } else {
 692                 while (--i >= 0) {
 693                         ep = alt_xfer(&intf->altsetting[i], xfer);
 694                         if (ep)
 695                                 break;
 696                 }
 697         }
 698         if (ep == NULL) {
 699                 err("no transfer endpoint found");
 700                 return NULL;
 701         }
 702         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 703                         i, ep->desc.bEndpointAddress);
 704         gspca_dev->alt = i;             /* memorize the current alt setting */
 705         if (gspca_dev->nbalt > 1) {
 706                 gspca_input_destroy_urb(gspca_dev);
 707                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 708                 if (ret < 0) {
 709                         err("set alt %d err %d", i, ret);
 710                         ep = NULL;
 711                 }
 712                 gspca_input_create_urb(gspca_dev);
 713         }
 714         return ep;
 715 }
 716
 717 /*
 718  * create the URBs for image transfer
 719  */
 720 static int create_urbs(struct gspca_dev *gspca_dev,
 721                         struct usb_host_endpoint *ep)
 722 {
 723         struct urb *urb;
 724         int n, nurbs, i, psize, npkt, bsize;
 725
 726         /* calculate the packet size and the number of packets */
 727         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 728
 729         if (!gspca_dev->cam.bulk) {             /* isoc */
 730
 731                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 732                 if (gspca_dev->pkt_size == 0)
 733                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 734                 else
 735                         psize = gspca_dev->pkt_size;
 736                 npkt = gspca_dev->cam.npkt;
 737                 if (npkt == 0)
 738                         npkt = 32;              /* default value */
 739                 bsize = psize * npkt;
 740                 PDEBUG(D_STREAM,
 741                         "isoc %d pkts size %d = bsize:%d",
 742                         npkt, psize, bsize);
 743                 nurbs = DEF_NURBS;
 744         } else {                                /* bulk */
 745                 npkt = 0;
 746                 bsize = gspca_dev->cam.bulk_size;
 747                 if (bsize == 0)
 748                         bsize = psize;
 749                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 750                 if (gspca_dev->cam.bulk_nurbs != 0)
 751                         nurbs = gspca_dev->cam.bulk_nurbs;
 752                 else
 753                         nurbs = 1;
 754         }
 755
 756         for (n = 0; n < nurbs; n++) {
 757                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 758                 if (!urb) {
 759                         err("usb_alloc_urb failed");
 760                         return -ENOMEM;
 761                 }
 762                 gspca_dev->urb[n] = urb;
 763                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 764                                                 bsize,
 765                                                 GFP_KERNEL,
 766                                                 &urb->transfer_dma);
 767
 768                 if (urb->transfer_buffer == NULL) {
 769                         err("usb_alloc_coherent failed");
 770                         return -ENOMEM;
 771                 }
 772                 urb->dev = gspca_dev->dev;
 773                 urb->context = gspca_dev;
 774                 urb->transfer_buffer_length = bsize;
 775                 if (npkt != 0) {                /* ISOC */
 776                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 777                                                     ep->desc.bEndpointAddress);
 778                         urb->transfer_flags = URB_ISO_ASAP
 779                                         | URB_NO_TRANSFER_DMA_MAP;
 780                         urb->interval = ep->desc.bInterval;
 781                         urb->complete = isoc_irq;
 782                         urb->number_of_packets = npkt;
 783                         for (i = 0; i < npkt; i++) {
 784                                 urb->iso_frame_desc[i].length = psize;
 785                                 urb->iso_frame_desc[i].offset = psize * i;
 786                         }
 787                 } else {                /* bulk */
 788                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 789                                                 ep->desc.bEndpointAddress),
 790                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 791                         urb->complete = bulk_irq;
 792                 }
 793         }
 794         return 0;
 795 }
 796
 797 /*
 798  * start the USB transfer
 799  */
 800 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 801 {
 802         struct usb_host_endpoint *ep;
 803         struct urb *urb;
 804         int n, ret;
 805
 806         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 807                 return -ERESTARTSYS;
 808
 809         if (!gspca_dev->present) {
 810                 ret = -ENODEV;
 811                 goto out;
 812         }
 813
 814         gspca_dev->usb_err = 0;
 815
 816         /* set the higher alternate setting and
 817          * loop until urb submit succeeds */
 818         if (gspca_dev->cam.reverse_alts)
 819                 gspca_dev->alt = 0;
 820         else
 821                 gspca_dev->alt = gspca_dev->nbalt;
 822
 823         if (gspca_dev->sd_desc->isoc_init) {
 824                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 825                 if (ret < 0)
 826                         goto out;
 827         }
 828         ep = get_ep(gspca_dev);
 829         if (ep == NULL) {
 830                 ret = -EIO;
 831                 goto out;
 832         }
 833         for (;;) {
 834                 if (!gspca_dev->cam.no_urb_create) {
 835                         PDEBUG(D_STREAM, "init transfer alt %d",
 836                                 gspca_dev->alt);
 837                         ret = create_urbs(gspca_dev, ep);
 838                         if (ret < 0) {
 839                                 destroy_urbs(gspca_dev);
 840                                 goto out;
 841                         }
 842                 }
 843
 844                 /* clear the bulk endpoint */
 845                 if (gspca_dev->cam.bulk)
 846                         usb_clear_halt(gspca_dev->dev,
 847                                         gspca_dev->urb[0]->pipe);
 848
 849                 /* start the cam */
 850                 ret = gspca_dev->sd_desc->start(gspca_dev);
 851                 if (ret < 0) {
 852                         destroy_urbs(gspca_dev);
 853                         goto out;
 854                 }
 855                 gspca_dev->streaming = 1;
 856
 857                 /* some bulk transfers are started by the subdriver */
 858                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 859                         break;
 860
 861                 /* submit the URBs */
 862                 for (n = 0; n < MAX_NURBS; n++) {
 863                         urb = gspca_dev->urb[n];
 864                         if (urb == NULL)
 865                                 break;
 866                         ret = usb_submit_urb(urb, GFP_KERNEL);
 867                         if (ret < 0)
 868                                 break;
 869                 }
 870                 if (ret >= 0)
 871                         break;
 872                 gspca_stream_off(gspca_dev);
 873                 if (ret != -ENOSPC) {
 874                         PDEBUG(D_ERR|D_STREAM,
 875                                 "usb_submit_urb alt %d err %d",
 876                                 gspca_dev->alt, ret);
 877                         goto out;
 878                 }
 879
 880                 /* the bandwidth is not wide enough
 881                  * negociate or try a lower alternate setting */
 882                 PDEBUG(D_ERR|D_STREAM,
 883                         "bandwidth not wide enough - trying again");
 884                 msleep(20);     /* wait for kill complete */
 885                 if (gspca_dev->sd_desc->isoc_nego) {
 886                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 887                         if (ret < 0)
 888                                 goto out;
 889                 } else {
 890                         ep = get_ep(gspca_dev);
 891                         if (ep == NULL) {
 892                                 ret = -EIO;
 893                                 goto out;
 894                         }
 895                 }
 896         }
 897 out:
 898         mutex_unlock(&gspca_dev->usb_lock);
 899         return ret;
 900 }
 901
 902 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 903 {
 904         int i;
 905
 906         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 907         gspca_dev->curr_mode = i;
 908         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 909         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 910         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 911 }
 912
 913 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 914                         int width, int height)
 915 {
 916         int i;
 917
 918         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 919                 if (width >= gspca_dev->cam.cam_mode[i].width
 920                     && height >= gspca_dev->cam.cam_mode[i].height)
 921                         break;
 922         }
 923         return i;
 924 }
 925
 926 /*
 927  * search a mode with the right pixel format
 928  */
 929 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 930                         int mode,
 931                         int pixfmt)
 932 {
 933         int modeU, modeD;
 934
 935         modeU = modeD = mode;
 936         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 937                 if (--modeD >= 0) {
 938                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 939                                                                 == pixfmt)
 940                                 return modeD;
 941                 }
 942                 if (++modeU < gspca_dev->cam.nmodes) {
 943                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 944                                                                 == pixfmt)
 945                                 return modeU;
 946                 }
 947         }
 948         return -EINVAL;
 949 }
 950
 951 #ifdef CONFIG_VIDEO_ADV_DEBUG
 952 static int vidioc_g_register(struct file *file, void *priv,
 953                         struct v4l2_dbg_register *reg)
 954 {
 955         int ret;
 956         struct gspca_dev *gspca_dev = priv;
 957
 958         if (!gspca_dev->sd_desc->get_chip_ident)
 959                 return -EINVAL;
 960
 961         if (!gspca_dev->sd_desc->get_register)
 962                 return -EINVAL;
 963
 964         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 965                 return -ERESTARTSYS;
 966         gspca_dev->usb_err = 0;
 967         if (gspca_dev->present)
 968                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 969         else
 970                 ret = -ENODEV;
 971         mutex_unlock(&gspca_dev->usb_lock);
 972
 973         return ret;
 974 }
 975
 976 static int vidioc_s_register(struct file *file, void *priv,
 977                         struct v4l2_dbg_register *reg)
 978 {
 979         int ret;
 980         struct gspca_dev *gspca_dev = priv;
 981
 982         if (!gspca_dev->sd_desc->get_chip_ident)
 983                 return -EINVAL;
 984
 985         if (!gspca_dev->sd_desc->set_register)
 986                 return -EINVAL;
 987
 988         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 989                 return -ERESTARTSYS;
 990         gspca_dev->usb_err = 0;
 991         if (gspca_dev->present)
 992                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 993         else
 994                 ret = -ENODEV;
 995         mutex_unlock(&gspca_dev->usb_lock);
 996
 997         return ret;
 998 }
 999 #endif
1000
1001 static int vidioc_g_chip_ident(struct file *file, void *priv,
1002                         struct v4l2_dbg_chip_ident *chip)
1003 {
1004         int ret;
1005         struct gspca_dev *gspca_dev = priv;
1006
1007         if (!gspca_dev->sd_desc->get_chip_ident)
1008                 return -EINVAL;
1009
1010         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1011                 return -ERESTARTSYS;
1012         gspca_dev->usb_err = 0;
1013         if (gspca_dev->present)
1014                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1015         else
1016                 ret = -ENODEV;
1017         mutex_unlock(&gspca_dev->usb_lock);
1018
1019         return ret;
1020 }
1021
1022 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1023                                 struct v4l2_fmtdesc *fmtdesc)
1024 {
1025         struct gspca_dev *gspca_dev = priv;
1026         int i, j, index;
1027         __u32 fmt_tb[8];
1028
1029         /* give an index to each format */
1030         index = 0;
1031         j = 0;
1032         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1033                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1034                 j = 0;
1035                 for (;;) {
1036                         if (fmt_tb[j] == fmt_tb[index])
1037                                 break;
1038                         j++;
1039                 }
1040                 if (j == index) {
1041                         if (fmtdesc->index == index)
1042                                 break;          /* new format */
1043                         index++;
1044                         if (index >= ARRAY_SIZE(fmt_tb))
1045                                 return -EINVAL;
1046                 }
1047         }
1048         if (i < 0)
1049                 return -EINVAL;         /* no more format */
1050
1051         fmtdesc->pixelformat = fmt_tb[index];
1052         if (gspca_is_compressed(fmt_tb[index]))
1053                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1054         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1055         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1056         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1057         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1058         fmtdesc->description[4] = '\0';
1059         return 0;
1060 }
1061
1062 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1063                             struct v4l2_format *fmt)
1064 {
1065         struct gspca_dev *gspca_dev = priv;
1066         int mode;
1067
1068         mode = gspca_dev->curr_mode;
1069         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1070                 sizeof fmt->fmt.pix);
1071         return 0;
1072 }
1073
1074 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1075                         struct v4l2_format *fmt)
1076 {
1077         int w, h, mode, mode2;
1078
1079         w = fmt->fmt.pix.width;
1080         h = fmt->fmt.pix.height;
1081
1082 #ifdef GSPCA_DEBUG
1083         if (gspca_debug & D_CONF)
1084                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1085 #endif
1086         /* search the closest mode for width and height */
1087         mode = wxh_to_mode(gspca_dev, w, h);
1088
1089         /* OK if right palette */
1090         if (gspca_dev->cam.cam_mode[mode].pixelformat
1091                                                 != fmt->fmt.pix.pixelformat) {
1092
1093                 /* else, search the closest mode with the same pixel format */
1094                 mode2 = gspca_get_mode(gspca_dev, mode,
1095                                         fmt->fmt.pix.pixelformat);
1096                 if (mode2 >= 0)
1097                         mode = mode2;
1098 /*              else
1099                         ;                * no chance, return this mode */
1100         }
1101         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1102                 sizeof fmt->fmt.pix);
1103         return mode;                    /* used when s_fmt */
1104 }
1105
1106 static int vidioc_try_fmt_vid_cap(struct file *file,
1107                               void *priv,
1108                               struct v4l2_format *fmt)
1109 {
1110         struct gspca_dev *gspca_dev = priv;
1111         int ret;
1112
1113         ret = try_fmt_vid_cap(gspca_dev, fmt);
1114         if (ret < 0)
1115                 return ret;
1116         return 0;
1117 }
1118
1119 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1120                             struct v4l2_format *fmt)
1121 {
1122         struct gspca_dev *gspca_dev = priv;
1123         int ret;
1124
1125         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1126                 return -ERESTARTSYS;
1127
1128         ret = try_fmt_vid_cap(gspca_dev, fmt);
1129         if (ret < 0)
1130                 goto out;
1131
1132         if (gspca_dev->nframes != 0
1133             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1134                 ret = -EINVAL;
1135                 goto out;
1136         }
1137
1138         if (ret == gspca_dev->curr_mode) {
1139                 ret = 0;
1140                 goto out;                       /* same mode */
1141         }
1142
1143         if (gspca_dev->streaming) {
1144                 ret = -EBUSY;
1145                 goto out;
1146         }
1147         gspca_dev->width = fmt->fmt.pix.width;
1148         gspca_dev->height = fmt->fmt.pix.height;
1149         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1150         gspca_dev->curr_mode = ret;
1151
1152         ret = 0;
1153 out:
1154         mutex_unlock(&gspca_dev->queue_lock);
1155         return ret;
1156 }
1157
1158 static int vidioc_enum_framesizes(struct file *file, void *priv,
1159                                   struct v4l2_frmsizeenum *fsize)
1160 {
1161         struct gspca_dev *gspca_dev = priv;
1162         int i;
1163         __u32 index = 0;
1164
1165         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1166                 if (fsize->pixel_format !=
1167                                 gspca_dev->cam.cam_mode[i].pixelformat)
1168                         continue;
1169
1170                 if (fsize->index == index) {
1171                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1172                         fsize->discrete.width =
1173                                 gspca_dev->cam.cam_mode[i].width;
1174                         fsize->discrete.height =
1175                                 gspca_dev->cam.cam_mode[i].height;
1176                         return 0;
1177                 }
1178                 index++;
1179         }
1180
1181         return -EINVAL;
1182 }
1183
1184 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1185                                       struct v4l2_frmivalenum *fival)
1186 {
1187         struct gspca_dev *gspca_dev = priv;
1188         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1189         __u32 i;
1190
1191         if (gspca_dev->cam.mode_framerates == NULL ||
1192                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1193                 return -EINVAL;
1194
1195         if (fival->pixel_format !=
1196                         gspca_dev->cam.cam_mode[mode].pixelformat)
1197                 return -EINVAL;
1198
1199         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1200                 if (fival->index == i) {
1201                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1202                         fival->discrete.numerator = 1;
1203                         fival->discrete.denominator =
1204                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1205                         return 0;
1206                 }
1207         }
1208
1209         return -EINVAL;
1210 }
1211
1212 static void gspca_release(struct video_device *vfd)
1213 {
1214         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1215
1216         PDEBUG(D_PROBE, "%s released",
1217                 video_device_node_name(&gspca_dev->vdev));
1218
1219         kfree(gspca_dev->usb_buf);
1220         kfree(gspca_dev);
1221 }
1222
1223 static int dev_open(struct file *file)
1224 {
1225         struct gspca_dev *gspca_dev;
1226         int ret;
1227
1228         PDEBUG(D_STREAM, "[%s] open", current->comm);
1229         gspca_dev = (struct gspca_dev *) video_devdata(file);
1230         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1231                 return -ERESTARTSYS;
1232         if (!gspca_dev->present) {
1233                 ret = -ENODEV;
1234                 goto out;
1235         }
1236
1237         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1238                 ret = -EBUSY;
1239                 goto out;
1240         }
1241
1242         /* protect the subdriver against rmmod */
1243         if (!try_module_get(gspca_dev->module)) {
1244                 ret = -ENODEV;
1245                 goto out;
1246         }
1247
1248         gspca_dev->users++;
1249
1250         file->private_data = gspca_dev;
1251 #ifdef GSPCA_DEBUG
1252         /* activate the v4l2 debug */
1253         if (gspca_debug & D_V4L2)
1254                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1255                                         | V4L2_DEBUG_IOCTL_ARG;
1256         else
1257                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1258                                         | V4L2_DEBUG_IOCTL_ARG);
1259 #endif
1260         ret = 0;
1261 out:
1262         mutex_unlock(&gspca_dev->queue_lock);
1263         if (ret != 0)
1264                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1265         else
1266                 PDEBUG(D_STREAM, "open done");
1267         return ret;
1268 }
1269
1270 static int dev_close(struct file *file)
1271 {
1272         struct gspca_dev *gspca_dev = file->private_data;
1273
1274         PDEBUG(D_STREAM, "[%s] close", current->comm);
1275         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1276                 return -ERESTARTSYS;
1277         gspca_dev->users--;
1278
1279         /* if the file did the capture, free the streaming resources */
1280         if (gspca_dev->capt_file == file) {
1281                 if (gspca_dev->streaming) {
1282                         mutex_lock(&gspca_dev->usb_lock);
1283                         gspca_dev->usb_err = 0;
1284                         gspca_stream_off(gspca_dev);
1285                         mutex_unlock(&gspca_dev->usb_lock);
1286                 }
1287                 frame_free(gspca_dev);
1288                 gspca_dev->capt_file = NULL;
1289                 gspca_dev->memory = GSPCA_MEMORY_NO;
1290         }
1291         file->private_data = NULL;
1292         module_put(gspca_dev->module);
1293         mutex_unlock(&gspca_dev->queue_lock);
1294
1295         PDEBUG(D_STREAM, "close done");
1296
1297         return 0;
1298 }
1299
1300 static int vidioc_querycap(struct file *file, void  *priv,
1301                            struct v4l2_capability *cap)
1302 {
1303         struct gspca_dev *gspca_dev = priv;
1304         int ret;
1305
1306         /* protect the access to the usb device */
1307         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1308                 return -ERESTARTSYS;
1309         if (!gspca_dev->present) {
1310                 ret = -ENODEV;
1311                 goto out;
1312         }
1313         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1314         if (gspca_dev->dev->product != NULL) {
1315                 strncpy(cap->card, gspca_dev->dev->product,
1316                         sizeof cap->card);
1317         } else {
1318                 snprintf(cap->card, sizeof cap->card,
1319                         "USB Camera (%04x:%04x)",
1320                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1321                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1322         }
1323         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1324         cap->version = DRIVER_VERSION_NUMBER;
1325         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1326                           | V4L2_CAP_STREAMING
1327                           | V4L2_CAP_READWRITE;
1328         ret = 0;
1329 out:
1330         mutex_unlock(&gspca_dev->usb_lock);
1331         return ret;
1332 }
1333
1334 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1335                                    int id)
1336 {
1337         const struct ctrl *ctrls;
1338         int i;
1339
1340         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1341              i < gspca_dev->sd_desc->nctrls;
1342              i++, ctrls++) {
1343                 if (gspca_dev->ctrl_dis & (1 << i))
1344                         continue;
1345                 if (id == ctrls->qctrl.id)
1346                         return ctrls;
1347         }
1348         return NULL;
1349 }
1350
1351 static int vidioc_queryctrl(struct file *file, void *priv,
1352                            struct v4l2_queryctrl *q_ctrl)
1353 {
1354         struct gspca_dev *gspca_dev = priv;
1355         const struct ctrl *ctrls;
1356         int i;
1357         u32 id;
1358
1359         ctrls = NULL;
1360         id = q_ctrl->id;
1361         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1362                 id &= V4L2_CTRL_ID_MASK;
1363                 id++;
1364                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1365                         if (gspca_dev->ctrl_dis & (1 << i))
1366                                 continue;
1367                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1368                                 continue;
1369                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1370                                             > ctrls->qctrl.id)
1371                                 continue;
1372                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1373                 }
1374                 if (ctrls == NULL)
1375                         return -EINVAL;
1376         } else {
1377                 ctrls = get_ctrl(gspca_dev, id);
1378                 if (ctrls == NULL)
1379                         return -EINVAL;
1380                 i = ctrls - gspca_dev->sd_desc->ctrls;
1381         }
1382         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1383         if (gspca_dev->ctrl_inac & (1 << i))
1384                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1385         return 0;
1386 }
1387
1388 static int vidioc_s_ctrl(struct file *file, void *priv,
1389                          struct v4l2_control *ctrl)
1390 {
1391         struct gspca_dev *gspca_dev = priv;
1392         const struct ctrl *ctrls;
1393         int ret;
1394
1395         ctrls = get_ctrl(gspca_dev, ctrl->id);
1396         if (ctrls == NULL)
1397                 return -EINVAL;
1398
1399         if (ctrl->value < ctrls->qctrl.minimum
1400             || ctrl->value > ctrls->qctrl.maximum)
1401                 return -ERANGE;
1402         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1403         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1404                 return -ERESTARTSYS;
1405         gspca_dev->usb_err = 0;
1406         if (gspca_dev->present)
1407                 ret = ctrls->set(gspca_dev, ctrl->value);
1408         else
1409                 ret = -ENODEV;
1410         mutex_unlock(&gspca_dev->usb_lock);
1411         return ret;
1412 }
1413
1414 static int vidioc_g_ctrl(struct file *file, void *priv,
1415                          struct v4l2_control *ctrl)
1416 {
1417         struct gspca_dev *gspca_dev = priv;
1418         const struct ctrl *ctrls;
1419         int ret;
1420
1421         ctrls = get_ctrl(gspca_dev, ctrl->id);
1422         if (ctrls == NULL)
1423                 return -EINVAL;
1424
1425         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1426                 return -ERESTARTSYS;
1427         gspca_dev->usb_err = 0;
1428         if (gspca_dev->present)
1429                 ret = ctrls->get(gspca_dev, &ctrl->value);
1430         else
1431                 ret = -ENODEV;
1432         mutex_unlock(&gspca_dev->usb_lock);
1433         return ret;
1434 }
1435
1436 /*fixme: have an audio flag in gspca_dev?*/
1437 static int vidioc_s_audio(struct file *file, void *priv,
1438                          struct v4l2_audio *audio)
1439 {
1440         if (audio->index != 0)
1441                 return -EINVAL;
1442         return 0;
1443 }
1444
1445 static int vidioc_g_audio(struct file *file, void *priv,
1446                          struct v4l2_audio *audio)
1447 {
1448         strcpy(audio->name, "Microphone");
1449         return 0;
1450 }
1451
1452 static int vidioc_enumaudio(struct file *file, void *priv,
1453                          struct v4l2_audio *audio)
1454 {
1455         if (audio->index != 0)
1456                 return -EINVAL;
1457
1458         strcpy(audio->name, "Microphone");
1459         audio->capability = 0;
1460         audio->mode = 0;
1461         return 0;
1462 }
1463
1464 static int vidioc_querymenu(struct file *file, void *priv,
1465                             struct v4l2_querymenu *qmenu)
1466 {
1467         struct gspca_dev *gspca_dev = priv;
1468
1469         if (!gspca_dev->sd_desc->querymenu)
1470                 return -EINVAL;
1471         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1472 }
1473
1474 static int vidioc_enum_input(struct file *file, void *priv,
1475                                 struct v4l2_input *input)
1476 {
1477         struct gspca_dev *gspca_dev = priv;
1478
1479         if (input->index != 0)
1480                 return -EINVAL;
1481         input->type = V4L2_INPUT_TYPE_CAMERA;
1482         input->status = gspca_dev->cam.input_flags;
1483         strncpy(input->name, gspca_dev->sd_desc->name,
1484                 sizeof input->name);
1485         return 0;
1486 }
1487
1488 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1489 {
1490         *i = 0;
1491         return 0;
1492 }
1493
1494 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1495 {
1496         if (i > 0)
1497                 return -EINVAL;
1498         return (0);
1499 }
1500
1501 static int vidioc_reqbufs(struct file *file, void *priv,
1502                           struct v4l2_requestbuffers *rb)
1503 {
1504         struct gspca_dev *gspca_dev = priv;
1505         int i, ret = 0, streaming;
1506
1507         switch (rb->memory) {
1508         case GSPCA_MEMORY_READ:                 /* (internal call) */
1509         case V4L2_MEMORY_MMAP:
1510         case V4L2_MEMORY_USERPTR:
1511                 break;
1512         default:
1513                 return -EINVAL;
1514         }
1515         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1516                 return -ERESTARTSYS;
1517
1518         if (gspca_dev->memory != GSPCA_MEMORY_NO
1519             && gspca_dev->memory != rb->memory) {
1520                 ret = -EBUSY;
1521                 goto out;
1522         }
1523
1524         /* only one file may do the capture */
1525         if (gspca_dev->capt_file != NULL
1526             && gspca_dev->capt_file != file) {
1527                 ret = -EBUSY;
1528                 goto out;
1529         }
1530
1531         /* if allocated, the buffers must not be mapped */
1532         for (i = 0; i < gspca_dev->nframes; i++) {
1533                 if (gspca_dev->frame[i].vma_use_count) {
1534                         ret = -EBUSY;
1535                         goto out;
1536                 }
1537         }
1538
1539         /* stop streaming */
1540         streaming = gspca_dev->streaming;
1541         if (streaming) {
1542                 mutex_lock(&gspca_dev->usb_lock);
1543                 gspca_dev->usb_err = 0;
1544                 gspca_stream_off(gspca_dev);
1545                 mutex_unlock(&gspca_dev->usb_lock);
1546         }
1547
1548         /* free the previous allocated buffers, if any */
1549         if (gspca_dev->nframes != 0) {
1550                 frame_free(gspca_dev);
1551                 gspca_dev->capt_file = NULL;
1552         }
1553         if (rb->count == 0)                     /* unrequest */
1554                 goto out;
1555         gspca_dev->memory = rb->memory;
1556         ret = frame_alloc(gspca_dev, rb->count);
1557         if (ret == 0) {
1558                 rb->count = gspca_dev->nframes;
1559                 gspca_dev->capt_file = file;
1560                 if (streaming)
1561                         ret = gspca_init_transfer(gspca_dev);
1562         }
1563 out:
1564         mutex_unlock(&gspca_dev->queue_lock);
1565         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1566         return ret;
1567 }
1568
1569 static int vidioc_querybuf(struct file *file, void *priv,
1570                            struct v4l2_buffer *v4l2_buf)
1571 {
1572         struct gspca_dev *gspca_dev = priv;
1573         struct gspca_frame *frame;
1574
1575         if (v4l2_buf->index < 0
1576             || v4l2_buf->index >= gspca_dev->nframes)
1577                 return -EINVAL;
1578
1579         frame = &gspca_dev->frame[v4l2_buf->index];
1580         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1581         return 0;
1582 }
1583
1584 static int vidioc_streamon(struct file *file, void *priv,
1585                            enum v4l2_buf_type buf_type)
1586 {
1587         struct gspca_dev *gspca_dev = priv;
1588         int ret;
1589
1590         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1591                 return -EINVAL;
1592         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1593                 return -ERESTARTSYS;
1594
1595         /* check the capture file */
1596         if (gspca_dev->capt_file != file) {
1597                 ret = -EBUSY;
1598                 goto out;
1599         }
1600
1601         if (gspca_dev->nframes == 0
1602             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1603                 ret = -EINVAL;
1604                 goto out;
1605         }
1606         if (!gspca_dev->streaming) {
1607                 ret = gspca_init_transfer(gspca_dev);
1608                 if (ret < 0)
1609                         goto out;
1610         }
1611 #ifdef GSPCA_DEBUG
1612         if (gspca_debug & D_STREAM) {
1613                 PDEBUG_MODE("stream on OK",
1614                         gspca_dev->pixfmt,
1615                         gspca_dev->width,
1616                         gspca_dev->height);
1617         }
1618 #endif
1619         ret = 0;
1620 out:
1621         mutex_unlock(&gspca_dev->queue_lock);
1622         return ret;
1623 }
1624
1625 static int vidioc_streamoff(struct file *file, void *priv,
1626                                 enum v4l2_buf_type buf_type)
1627 {
1628         struct gspca_dev *gspca_dev = priv;
1629         int i, ret;
1630
1631         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1632                 return -EINVAL;
1633         if (!gspca_dev->streaming)
1634                 return 0;
1635         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1636                 return -ERESTARTSYS;
1637
1638         /* check the capture file */
1639         if (gspca_dev->capt_file != file) {
1640                 ret = -EBUSY;
1641                 goto out;
1642         }
1643
1644         /* stop streaming */
1645         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1646                 ret = -ERESTARTSYS;
1647                 goto out;
1648         }
1649         gspca_dev->usb_err = 0;
1650         gspca_stream_off(gspca_dev);
1651         mutex_unlock(&gspca_dev->usb_lock);
1652
1653         /* empty the application queues */
1654         for (i = 0; i < gspca_dev->nframes; i++)
1655                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1656         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1657         gspca_dev->last_packet_type = DISCARD_PACKET;
1658         gspca_dev->sequence = 0;
1659         ret = 0;
1660 out:
1661         mutex_unlock(&gspca_dev->queue_lock);
1662         return ret;
1663 }
1664
1665 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1666                         struct v4l2_jpegcompression *jpegcomp)
1667 {
1668         struct gspca_dev *gspca_dev = priv;
1669         int ret;
1670
1671         if (!gspca_dev->sd_desc->get_jcomp)
1672                 return -EINVAL;
1673         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1674                 return -ERESTARTSYS;
1675         gspca_dev->usb_err = 0;
1676         if (gspca_dev->present)
1677                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1678         else
1679                 ret = -ENODEV;
1680         mutex_unlock(&gspca_dev->usb_lock);
1681         return ret;
1682 }
1683
1684 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1685                         struct v4l2_jpegcompression *jpegcomp)
1686 {
1687         struct gspca_dev *gspca_dev = priv;
1688         int ret;
1689
1690         if (!gspca_dev->sd_desc->set_jcomp)
1691                 return -EINVAL;
1692         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1693                 return -ERESTARTSYS;
1694         gspca_dev->usb_err = 0;
1695         if (gspca_dev->present)
1696                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1697         else
1698                 ret = -ENODEV;
1699         mutex_unlock(&gspca_dev->usb_lock);
1700         return ret;
1701 }
1702
1703 static int vidioc_g_parm(struct file *filp, void *priv,
1704                         struct v4l2_streamparm *parm)
1705 {
1706         struct gspca_dev *gspca_dev = priv;
1707
1708         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1709
1710         if (gspca_dev->sd_desc->get_streamparm) {
1711                 int ret;
1712
1713                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1714                         return -ERESTARTSYS;
1715                 gspca_dev->usb_err = 0;
1716                 if (gspca_dev->present)
1717                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1718                                                                  parm);
1719                 else
1720                         ret = -ENODEV;
1721                 mutex_unlock(&gspca_dev->usb_lock);
1722                 return ret;
1723         }
1724
1725         return 0;
1726 }
1727
1728 static int vidioc_s_parm(struct file *filp, void *priv,
1729                         struct v4l2_streamparm *parm)
1730 {
1731         struct gspca_dev *gspca_dev = priv;
1732         int n;
1733
1734         n = parm->parm.capture.readbuffers;
1735         if (n == 0 || n > GSPCA_MAX_FRAMES)
1736                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1737         else
1738                 gspca_dev->nbufread = n;
1739
1740         if (gspca_dev->sd_desc->set_streamparm) {
1741                 int ret;
1742
1743                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1744                         return -ERESTARTSYS;
1745                 gspca_dev->usb_err = 0;
1746                 if (gspca_dev->present)
1747                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1748                                                                  parm);
1749                 else
1750                         ret = -ENODEV;
1751                 mutex_unlock(&gspca_dev->usb_lock);
1752                 return ret;
1753         }
1754
1755         return 0;
1756 }
1757
1758 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1759 static int vidiocgmbuf(struct file *file, void *priv,
1760                         struct video_mbuf *mbuf)
1761 {
1762         struct gspca_dev *gspca_dev = file->private_data;
1763         int i;
1764
1765         PDEBUG(D_STREAM, "cgmbuf");
1766         if (gspca_dev->nframes == 0) {
1767                 int ret;
1768
1769                 {
1770                         struct v4l2_format fmt;
1771
1772                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1773                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1774                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1775                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1776                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1777                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1778                         if (ret != 0)
1779                                 return ret;
1780                 }
1781                 {
1782                         struct v4l2_requestbuffers rb;
1783
1784                         memset(&rb, 0, sizeof rb);
1785                         rb.count = 4;
1786                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1787                         rb.memory = V4L2_MEMORY_MMAP;
1788                         ret = vidioc_reqbufs(file, priv, &rb);
1789                         if (ret != 0)
1790                                 return ret;
1791                 }
1792         }
1793         mbuf->frames = gspca_dev->nframes;
1794         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1795         for (i = 0; i < mbuf->frames; i++)
1796                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1797         return 0;
1798 }
1799 #endif
1800
1801 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1802 {
1803         struct gspca_dev *gspca_dev = file->private_data;
1804         struct gspca_frame *frame;
1805         struct page *page;
1806         unsigned long addr, start, size;
1807         int i, ret;
1808
1809         start = vma->vm_start;
1810         size = vma->vm_end - vma->vm_start;
1811         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1812
1813         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1814                 return -ERESTARTSYS;
1815         if (!gspca_dev->present) {
1816                 ret = -ENODEV;
1817                 goto out;
1818         }
1819         if (gspca_dev->capt_file != file) {
1820                 ret = -EINVAL;
1821                 goto out;
1822         }
1823
1824         frame = NULL;
1825         for (i = 0; i < gspca_dev->nframes; ++i) {
1826                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1827                         PDEBUG(D_STREAM, "mmap bad memory type");
1828                         break;
1829                 }
1830                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1831                                                 == vma->vm_pgoff) {
1832                         frame = &gspca_dev->frame[i];
1833                         break;
1834                 }
1835         }
1836         if (frame == NULL) {
1837                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1838                 ret = -EINVAL;
1839                 goto out;
1840         }
1841 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1842         /* v4l1 maps all the buffers */
1843         if (i != 0
1844             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1845 #endif
1846             if (size != frame->v4l2_buf.length) {
1847                 PDEBUG(D_STREAM, "mmap bad size");
1848                 ret = -EINVAL;
1849                 goto out;
1850         }
1851
1852         /*
1853          * - VM_IO marks the area as being a mmaped region for I/O to a
1854          *   device. It also prevents the region from being core dumped.
1855          */
1856         vma->vm_flags |= VM_IO;
1857
1858         addr = (unsigned long) frame->data;
1859         while (size > 0) {
1860                 page = vmalloc_to_page((void *) addr);
1861                 ret = vm_insert_page(vma, start, page);
1862                 if (ret < 0)
1863                         goto out;
1864                 start += PAGE_SIZE;
1865                 addr += PAGE_SIZE;
1866                 size -= PAGE_SIZE;
1867         }
1868
1869         vma->vm_ops = &gspca_vm_ops;
1870         vma->vm_private_data = frame;
1871         gspca_vm_open(vma);
1872         ret = 0;
1873 out:
1874         mutex_unlock(&gspca_dev->queue_lock);
1875         return ret;
1876 }
1877
1878 /*
1879  * wait for a video frame
1880  *
1881  * If a frame is ready, its index is returned.
1882  */
1883 static int frame_wait(struct gspca_dev *gspca_dev,
1884                         int nonblock_ing)
1885 {
1886         struct gspca_frame *frame;
1887         int i, j, ret;
1888
1889         /* check if a frame is ready */
1890         i = gspca_dev->fr_o;
1891         j = gspca_dev->fr_queue[i];
1892         frame = &gspca_dev->frame[j];
1893
1894         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1895                 if (nonblock_ing)
1896                         return -EAGAIN;
1897
1898                 /* wait till a frame is ready */
1899                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1900                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1901                         !gspca_dev->streaming || !gspca_dev->present,
1902                         msecs_to_jiffies(3000));
1903                 if (ret < 0)
1904                         return ret;
1905                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1906                         return -EIO;
1907         }
1908
1909         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1910         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1911                 gspca_dev->fr_q,
1912                 gspca_dev->fr_i,
1913                 gspca_dev->fr_o);
1914
1915         if (gspca_dev->sd_desc->dq_callback) {
1916                 mutex_lock(&gspca_dev->usb_lock);
1917                 gspca_dev->usb_err = 0;
1918                 if (gspca_dev->present)
1919                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1920                 mutex_unlock(&gspca_dev->usb_lock);
1921         }
1922         return j;
1923 }
1924
1925 /*
1926  * dequeue a video buffer
1927  *
1928  * If nonblock_ing is false, block until a buffer is available.
1929  */
1930 static int vidioc_dqbuf(struct file *file, void *priv,
1931                         struct v4l2_buffer *v4l2_buf)
1932 {
1933         struct gspca_dev *gspca_dev = priv;
1934         struct gspca_frame *frame;
1935         int i, ret;
1936
1937         PDEBUG(D_FRAM, "dqbuf");
1938         if (v4l2_buf->memory != gspca_dev->memory)
1939                 return -EINVAL;
1940
1941         if (!gspca_dev->present)
1942                 return -ENODEV;
1943
1944         /* if not streaming, be sure the application will not loop forever */
1945         if (!(file->f_flags & O_NONBLOCK)
1946             && !gspca_dev->streaming && gspca_dev->users == 1)
1947                 return -EINVAL;
1948
1949         /* only the capturing file may dequeue */
1950         if (gspca_dev->capt_file != file)
1951                 return -EINVAL;
1952
1953         /* only one dequeue / read at a time */
1954         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1955                 return -ERESTARTSYS;
1956
1957         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1958         if (ret < 0)
1959                 goto out;
1960         i = ret;                                /* frame index */
1961         frame = &gspca_dev->frame[i];
1962         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1963                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1964                                  frame->data,
1965                                  frame->v4l2_buf.bytesused)) {
1966                         PDEBUG(D_ERR|D_STREAM,
1967                                 "dqbuf cp to user failed");
1968                         ret = -EFAULT;
1969                         goto out;
1970                 }
1971         }
1972         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1973         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1974         PDEBUG(D_FRAM, "dqbuf %d", i);
1975         ret = 0;
1976 out:
1977         mutex_unlock(&gspca_dev->read_lock);
1978         return ret;
1979 }
1980
1981 /*
1982  * queue a video buffer
1983  *
1984  * Attempting to queue a buffer that has already been
1985  * queued will return -EINVAL.
1986  */
1987 static int vidioc_qbuf(struct file *file, void *priv,
1988                         struct v4l2_buffer *v4l2_buf)
1989 {
1990         struct gspca_dev *gspca_dev = priv;
1991         struct gspca_frame *frame;
1992         int i, index, ret;
1993
1994         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1995
1996         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1997                 return -ERESTARTSYS;
1998
1999         index = v4l2_buf->index;
2000         if ((unsigned) index >= gspca_dev->nframes) {
2001                 PDEBUG(D_FRAM,
2002                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
2003                 ret = -EINVAL;
2004                 goto out;
2005         }
2006         if (v4l2_buf->memory != gspca_dev->memory) {
2007                 PDEBUG(D_FRAM, "qbuf bad memory type");
2008                 ret = -EINVAL;
2009                 goto out;
2010         }
2011
2012         frame = &gspca_dev->frame[index];
2013         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
2014                 PDEBUG(D_FRAM, "qbuf bad state");
2015                 ret = -EINVAL;
2016                 goto out;
2017         }
2018
2019         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
2020
2021         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2022                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2023                 frame->v4l2_buf.length = v4l2_buf->length;
2024         }
2025
2026         /* put the buffer in the 'queued' queue */
2027         i = gspca_dev->fr_q;
2028         gspca_dev->fr_queue[i] = index;
2029         if (gspca_dev->fr_i == i)
2030                 gspca_dev->cur_frame = frame;
2031         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
2032         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
2033                 gspca_dev->fr_q,
2034                 gspca_dev->fr_i,
2035                 gspca_dev->fr_o);
2036
2037         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2038         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2039         ret = 0;
2040 out:
2041         mutex_unlock(&gspca_dev->queue_lock);
2042         return ret;
2043 }
2044
2045 /*
2046  * allocate the resources for read()
2047  */
2048 static int read_alloc(struct gspca_dev *gspca_dev,
2049                         struct file *file)
2050 {
2051         struct v4l2_buffer v4l2_buf;
2052         int i, ret;
2053
2054         PDEBUG(D_STREAM, "read alloc");
2055         if (gspca_dev->nframes == 0) {
2056                 struct v4l2_requestbuffers rb;
2057
2058                 memset(&rb, 0, sizeof rb);
2059                 rb.count = gspca_dev->nbufread;
2060                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2061                 rb.memory = GSPCA_MEMORY_READ;
2062                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2063                 if (ret != 0) {
2064                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2065                         return ret;
2066                 }
2067                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2068                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2069                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2070                 for (i = 0; i < gspca_dev->nbufread; i++) {
2071                         v4l2_buf.index = i;
2072                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2073                         if (ret != 0) {
2074                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2075                                 return ret;
2076                         }
2077                 }
2078                 gspca_dev->memory = GSPCA_MEMORY_READ;
2079         }
2080
2081         /* start streaming */
2082         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2083         if (ret != 0)
2084                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2085         return ret;
2086 }
2087
2088 static unsigned int dev_poll(struct file *file, poll_table *wait)
2089 {
2090         struct gspca_dev *gspca_dev = file->private_data;
2091         int i, ret;
2092
2093         PDEBUG(D_FRAM, "poll");
2094
2095         poll_wait(file, &gspca_dev->wq, wait);
2096
2097         /* if reqbufs is not done, the user would use read() */
2098         if (gspca_dev->nframes == 0) {
2099                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2100                         return POLLERR;         /* not the 1st time */
2101                 ret = read_alloc(gspca_dev, file);
2102                 if (ret != 0)
2103                         return POLLERR;
2104         }
2105
2106         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2107                 return POLLERR;
2108
2109         /* check the next incoming buffer */
2110         i = gspca_dev->fr_o;
2111         i = gspca_dev->fr_queue[i];
2112         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
2113                 ret = POLLIN | POLLRDNORM;      /* something to read */
2114         else
2115                 ret = 0;
2116         mutex_unlock(&gspca_dev->queue_lock);
2117         if (!gspca_dev->present)
2118                 return POLLHUP;
2119         return ret;
2120 }
2121
2122 static ssize_t dev_read(struct file *file, char __user *data,
2123                     size_t count, loff_t *ppos)
2124 {
2125         struct gspca_dev *gspca_dev = file->private_data;
2126         struct gspca_frame *frame;
2127         struct v4l2_buffer v4l2_buf;
2128         struct timeval timestamp;
2129         int n, ret, ret2;
2130
2131         PDEBUG(D_FRAM, "read (%zd)", count);
2132         if (!gspca_dev->present)
2133                 return -ENODEV;
2134         switch (gspca_dev->memory) {
2135         case GSPCA_MEMORY_NO:                   /* first time */
2136                 ret = read_alloc(gspca_dev, file);
2137                 if (ret != 0)
2138                         return ret;
2139                 break;
2140         case GSPCA_MEMORY_READ:
2141                 if (gspca_dev->capt_file == file)
2142                         break;
2143                 /* fall thru */
2144         default:
2145                 return -EINVAL;
2146         }
2147
2148         /* get a frame */
2149         timestamp = ktime_to_timeval(ktime_get());
2150         timestamp.tv_sec--;
2151         n = 2;
2152         for (;;) {
2153                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2154                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2155                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2156                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2157                 if (ret != 0) {
2158                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2159                         return ret;
2160                 }
2161
2162                 /* if the process slept for more than 1 second,
2163                  * get a newer frame */
2164                 frame = &gspca_dev->frame[v4l2_buf.index];
2165                 if (--n < 0)
2166                         break;                  /* avoid infinite loop */
2167                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2168                         break;
2169                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2170                 if (ret != 0) {
2171                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2172                         return ret;
2173                 }
2174         }
2175
2176         /* copy the frame */
2177         if (count > frame->v4l2_buf.bytesused)
2178                 count = frame->v4l2_buf.bytesused;
2179         ret = copy_to_user(data, frame->data, count);
2180         if (ret != 0) {
2181                 PDEBUG(D_ERR|D_STREAM,
2182                         "read cp to user lack %d / %zd", ret, count);
2183                 ret = -EFAULT;
2184                 goto out;
2185         }
2186         ret = count;
2187 out:
2188         /* in each case, requeue the buffer */
2189         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2190         if (ret2 != 0)
2191                 return ret2;
2192         return ret;
2193 }
2194
2195 static struct v4l2_file_operations dev_fops = {
2196         .owner = THIS_MODULE,
2197         .open = dev_open,
2198         .release = dev_close,
2199         .read = dev_read,
2200         .mmap = dev_mmap,
2201         .unlocked_ioctl = video_ioctl2,
2202         .poll   = dev_poll,
2203 };
2204
2205 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2206         .vidioc_querycap        = vidioc_querycap,
2207         .vidioc_dqbuf           = vidioc_dqbuf,
2208         .vidioc_qbuf            = vidioc_qbuf,
2209         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2210         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2211         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2212         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2213         .vidioc_streamon        = vidioc_streamon,
2214         .vidioc_queryctrl       = vidioc_queryctrl,
2215         .vidioc_g_ctrl          = vidioc_g_ctrl,
2216         .vidioc_s_ctrl          = vidioc_s_ctrl,
2217         .vidioc_g_audio         = vidioc_g_audio,
2218         .vidioc_s_audio         = vidioc_s_audio,
2219         .vidioc_enumaudio       = vidioc_enumaudio,
2220         .vidioc_querymenu       = vidioc_querymenu,
2221         .vidioc_enum_input      = vidioc_enum_input,
2222         .vidioc_g_input         = vidioc_g_input,
2223         .vidioc_s_input         = vidioc_s_input,
2224         .vidioc_reqbufs         = vidioc_reqbufs,
2225         .vidioc_querybuf        = vidioc_querybuf,
2226         .vidioc_streamoff       = vidioc_streamoff,
2227         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2228         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2229         .vidioc_g_parm          = vidioc_g_parm,
2230         .vidioc_s_parm          = vidioc_s_parm,
2231         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2232         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2233 #ifdef CONFIG_VIDEO_ADV_DEBUG
2234         .vidioc_g_register      = vidioc_g_register,
2235         .vidioc_s_register      = vidioc_s_register,
2236 #endif
2237         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2238 #ifdef CONFIG_VIDEO_V4L1_COMPAT
2239         .vidiocgmbuf          = vidiocgmbuf,
2240 #endif
2241 };
2242
2243 static struct video_device gspca_template = {
2244         .name = "gspca main driver",
2245         .fops = &dev_fops,
2246         .ioctl_ops = &dev_ioctl_ops,
2247         .release = gspca_release,
2248 };
2249
2250 /*
2251  * probe and create a new gspca device
2252  *
2253  * This function must be called by the sub-driver when it is
2254  * called for probing a new device.
2255  */
2256 int gspca_dev_probe(struct usb_interface *intf,
2257                 const struct usb_device_id *id,
2258                 const struct sd_desc *sd_desc,
2259                 int dev_size,
2260                 struct module *module)
2261 {
2262         struct usb_interface_descriptor *interface;
2263         struct gspca_dev *gspca_dev;
2264         struct usb_device *dev = interface_to_usbdev(intf);
2265         int ret;
2266
2267         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2268
2269         /* we don't handle multi-config cameras */
2270         if (dev->descriptor.bNumConfigurations != 1) {
2271                 PDEBUG(D_ERR, "Too many config");
2272                 return -ENODEV;
2273         }
2274
2275         /* the USB video interface must be the first one */
2276         interface = &intf->cur_altsetting->desc;
2277         if (dev->config->desc.bNumInterfaces != 1 &&
2278             interface->bInterfaceNumber != 0)
2279                 return -ENODEV;
2280
2281         /* create the device */
2282         if (dev_size < sizeof *gspca_dev)
2283                 dev_size = sizeof *gspca_dev;
2284         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2285         if (!gspca_dev) {
2286                 err("couldn't kzalloc gspca struct");
2287                 return -ENOMEM;
2288         }
2289         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2290         if (!gspca_dev->usb_buf) {
2291                 err("out of memory");
2292                 ret = -ENOMEM;
2293                 goto out;
2294         }
2295         gspca_dev->dev = dev;
2296         gspca_dev->iface = interface->bInterfaceNumber;
2297         gspca_dev->nbalt = intf->num_altsetting;
2298         gspca_dev->sd_desc = sd_desc;
2299         gspca_dev->nbufread = 2;
2300         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2301
2302         /* configure the subdriver and initialize the USB device */
2303         ret = sd_desc->config(gspca_dev, id);
2304         if (ret < 0)
2305                 goto out;
2306         ret = sd_desc->init(gspca_dev);
2307         if (ret < 0)
2308                 goto out;
2309         gspca_set_default_mode(gspca_dev);
2310
2311         ret = gspca_input_connect(gspca_dev);
2312         if (ret)
2313                 goto out;
2314
2315         mutex_init(&gspca_dev->usb_lock);
2316         mutex_init(&gspca_dev->read_lock);
2317         mutex_init(&gspca_dev->queue_lock);
2318         init_waitqueue_head(&gspca_dev->wq);
2319
2320         /* init video stuff */
2321         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2322         gspca_dev->vdev.parent = &intf->dev;
2323         gspca_dev->module = module;
2324         gspca_dev->present = 1;
2325         ret = video_register_device(&gspca_dev->vdev,
2326                                   VFL_TYPE_GRABBER,
2327                                   -1);
2328         if (ret < 0) {
2329                 err("video_register_device err %d", ret);
2330                 goto out;
2331         }
2332
2333         usb_set_intfdata(intf, gspca_dev);
2334         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2335
2336         gspca_input_create_urb(gspca_dev);
2337
2338         return 0;
2339 out:
2340 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2341         if (gspca_dev->input_dev)
2342                 input_unregister_device(gspca_dev->input_dev);
2343 #endif
2344         kfree(gspca_dev->usb_buf);
2345         kfree(gspca_dev);
2346         return ret;
2347 }
2348 EXPORT_SYMBOL(gspca_dev_probe);
2349
2350 /*
2351  * USB disconnection
2352  *
2353  * This function must be called by the sub-driver
2354  * when the device disconnects, after the specific resources are freed.
2355  */
2356 void gspca_disconnect(struct usb_interface *intf)
2357 {
2358         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2359 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2360         struct input_dev *input_dev;
2361 #endif
2362
2363         PDEBUG(D_PROBE, "%s disconnect",
2364                 video_device_node_name(&gspca_dev->vdev));
2365         mutex_lock(&gspca_dev->usb_lock);
2366         gspca_dev->present = 0;
2367
2368         if (gspca_dev->streaming) {
2369                 destroy_urbs(gspca_dev);
2370                 wake_up_interruptible(&gspca_dev->wq);
2371         }
2372
2373 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2374         gspca_input_destroy_urb(gspca_dev);
2375         input_dev = gspca_dev->input_dev;
2376         if (input_dev) {
2377                 gspca_dev->input_dev = NULL;
2378                 input_unregister_device(input_dev);
2379         }
2380 #endif
2381
2382         /* the device is freed at exit of this function */
2383         gspca_dev->dev = NULL;
2384         mutex_unlock(&gspca_dev->usb_lock);
2385
2386         usb_set_intfdata(intf, NULL);
2387
2388         /* release the device */
2389         /* (this will call gspca_release() immediatly or on last close) */
2390         video_unregister_device(&gspca_dev->vdev);
2391
2392 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2393 }
2394 EXPORT_SYMBOL(gspca_disconnect);
2395
2396 #ifdef CONFIG_PM
2397 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2398 {
2399         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2400
2401         if (!gspca_dev->streaming)
2402                 return 0;
2403         gspca_dev->frozen = 1;          /* avoid urb error messages */
2404         if (gspca_dev->sd_desc->stopN)
2405                 gspca_dev->sd_desc->stopN(gspca_dev);
2406         destroy_urbs(gspca_dev);
2407         gspca_input_destroy_urb(gspca_dev);
2408         gspca_set_alt0(gspca_dev);
2409         if (gspca_dev->sd_desc->stop0)
2410                 gspca_dev->sd_desc->stop0(gspca_dev);
2411         return 0;
2412 }
2413 EXPORT_SYMBOL(gspca_suspend);
2414
2415 int gspca_resume(struct usb_interface *intf)
2416 {
2417         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2418
2419         gspca_dev->frozen = 0;
2420         gspca_dev->sd_desc->init(gspca_dev);
2421         gspca_input_create_urb(gspca_dev);
2422         if (gspca_dev->streaming)
2423                 return gspca_init_transfer(gspca_dev);
2424         return 0;
2425 }
2426 EXPORT_SYMBOL(gspca_resume);
2427 #endif
2428 /* -- cam driver utility functions -- */
2429
2430 /* auto gain and exposure algorithm based on the knee algorithm described here:
2431    http://ytse.tricolour.net/docs/LowLightOptimization.html
2432
2433    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2434    where changed. */
2435 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2436         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2437 {
2438         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2439         const struct ctrl *gain_ctrl = NULL;
2440         const struct ctrl *exposure_ctrl = NULL;
2441         const struct ctrl *autogain_ctrl = NULL;
2442         int retval = 0;
2443
2444         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2445                 if (gspca_dev->ctrl_dis & (1 << i))
2446                         continue;
2447                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2448                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2449                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2450                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2451                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2452                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2453         }
2454         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2455                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2456                         "on cam without (auto)gain/exposure");
2457                 return 0;
2458         }
2459
2460         if (gain_ctrl->get(gspca_dev, &gain) ||
2461                         exposure_ctrl->get(gspca_dev, &exposure) ||
2462                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2463                 return 0;
2464
2465         orig_gain = gain;
2466         orig_exposure = exposure;
2467
2468         /* If we are of a multiple of deadzone, do multiple steps to reach the
2469            desired lumination fast (with the risc of a slight overshoot) */
2470         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2471
2472         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2473                 avg_lum, desired_avg_lum, steps);
2474
2475         for (i = 0; i < steps; i++) {
2476                 if (avg_lum > desired_avg_lum) {
2477                         if (gain > gain_knee)
2478                                 gain--;
2479                         else if (exposure > exposure_knee)
2480                                 exposure--;
2481                         else if (gain > gain_ctrl->qctrl.default_value)
2482                                 gain--;
2483                         else if (exposure > exposure_ctrl->qctrl.minimum)
2484                                 exposure--;
2485                         else if (gain > gain_ctrl->qctrl.minimum)
2486                                 gain--;
2487                         else
2488                                 break;
2489                 } else {
2490                         if (gain < gain_ctrl->qctrl.default_value)
2491                                 gain++;
2492                         else if (exposure < exposure_knee)
2493                                 exposure++;
2494                         else if (gain < gain_knee)
2495                                 gain++;
2496                         else if (exposure < exposure_ctrl->qctrl.maximum)
2497                                 exposure++;
2498                         else if (gain < gain_ctrl->qctrl.maximum)
2499                                 gain++;
2500                         else
2501                                 break;
2502                 }
2503         }
2504
2505         if (gain != orig_gain) {
2506                 gain_ctrl->set(gspca_dev, gain);
2507                 retval = 1;
2508         }
2509         if (exposure != orig_exposure) {
2510                 exposure_ctrl->set(gspca_dev, exposure);
2511                 retval = 1;
2512         }
2513
2514         return retval;
2515 }
2516 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2517
2518 /* -- module insert / remove -- */
2519 static int __init gspca_init(void)
2520 {
2521         info("main v%d.%d.%d registered",
2522                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2523                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2524                 DRIVER_VERSION_NUMBER & 0xff);
2525         return 0;
2526 }
2527 static void __exit gspca_exit(void)
2528 {
2529         info("main deregistered");
2530 }
2531
2532 module_init(gspca_init);
2533 module_exit(gspca_exit);
2534
2535 #ifdef GSPCA_DEBUG
2536 module_param_named(debug, gspca_debug, int, 0644);
2537 MODULE_PARM_DESC(debug,
2538                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2539                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2540                 " 0x0100: v4l2");
2541 #endif