drivers/media/usb/cpia2/cpia2_v4l.c

   1 /****************************************************************************
   2  *
   3  *  Filename: cpia2_v4l.c
   4  *
   5  *  Copyright 2001, STMicrolectronics, Inc.
   6  *      Contact:  steve.miller@st.com
   7  *  Copyright 2001,2005, Scott J. Bertin <scottbertin@yahoo.com>
   8  *
   9  *  Description:
  10  *     This is a USB driver for CPia2 based video cameras.
  11  *     The infrastructure of this driver is based on the cpia usb driver by
  12  *     Jochen Scharrlach and Johannes Erdfeldt.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License as published by
  16  *  the Free Software Foundation; either version 2 of the License, or
  17  *  (at your option) any later version.
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  Stripped of 2.4 stuff ready for main kernel submit by
  25  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  26  ****************************************************************************/
  27
  28 #define CPIA_VERSION "3.0.1"
  29
  30 #include <linux/module.h>
  31 #include <linux/time.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/init.h>
  35 #include <linux/videodev2.h>
  36 #include <linux/stringify.h>
  37 #include <media/v4l2-ioctl.h>
  38 #include <media/v4l2-event.h>
  39
  40 #include "cpia2.h"
  41
  42 static int video_nr = -1;
  43 module_param(video_nr, int, 0);
  44 MODULE_PARM_DESC(video_nr, "video device to register (0=/dev/video0, etc)");
  45
  46 static int buffer_size = 68 * 1024;
  47 module_param(buffer_size, int, 0);
  48 MODULE_PARM_DESC(buffer_size, "Size for each frame buffer in bytes (default 68k)");
  49
  50 static int num_buffers = 3;
  51 module_param(num_buffers, int, 0);
  52 MODULE_PARM_DESC(num_buffers, "Number of frame buffers (1-"
  53                  __stringify(VIDEO_MAX_FRAME) ", default 3)");
  54
  55 static int alternate = DEFAULT_ALT;
  56 module_param(alternate, int, 0);
  57 MODULE_PARM_DESC(alternate, "USB Alternate (" __stringify(USBIF_ISO_1) "-"
  58                  __stringify(USBIF_ISO_6) ", default "
  59                  __stringify(DEFAULT_ALT) ")");
  60
  61 static int flicker_mode;
  62 module_param(flicker_mode, int, 0);
  63 MODULE_PARM_DESC(flicker_mode, "Flicker frequency (0 (disabled), " __stringify(50) " or "
  64                  __stringify(60) ", default 0)");
  65
  66 MODULE_AUTHOR("Steve Miller (STMicroelectronics) <steve.miller@st.com>");
  67 MODULE_DESCRIPTION("V4L-driver for STMicroelectronics CPiA2 based cameras");
  68 MODULE_SUPPORTED_DEVICE("video");
  69 MODULE_LICENSE("GPL");
  70 MODULE_VERSION(CPIA_VERSION);
  71
  72 #define ABOUT "V4L-Driver for Vision CPiA2 based cameras"
  73 #define CPIA2_CID_USB_ALT (V4L2_CID_USER_BASE | 0xf000)
  74
  75 /******************************************************************************
  76  *
  77  *  cpia2_open
  78  *
  79  *****************************************************************************/
  80 static int cpia2_open(struct file *file)
  81 {
  82         struct camera_data *cam = video_drvdata(file);
  83         int retval;
  84
  85         if (mutex_lock_interruptible(&cam->v4l2_lock))
  86                 return -ERESTARTSYS;
  87         retval = v4l2_fh_open(file);
  88         if (retval)
  89                 goto open_unlock;
  90
  91         if (v4l2_fh_is_singular_file(file)) {
  92                 if (cpia2_allocate_buffers(cam)) {
  93                         v4l2_fh_release(file);
  94                         retval = -ENOMEM;
  95                         goto open_unlock;
  96                 }
  97
  98                 /* reset the camera */
  99                 if (cpia2_reset_camera(cam) < 0) {
 100                         v4l2_fh_release(file);
 101                         retval = -EIO;
 102                         goto open_unlock;
 103                 }
 104
 105                 cam->APP_len = 0;
 106                 cam->COM_len = 0;
 107         }
 108
 109         cpia2_dbg_dump_registers(cam);
 110 open_unlock:
 111         mutex_unlock(&cam->v4l2_lock);
 112         return retval;
 113 }
 114
 115 /******************************************************************************
 116  *
 117  *  cpia2_close
 118  *
 119  *****************************************************************************/
 120 static int cpia2_close(struct file *file)
 121 {
 122         struct video_device *dev = video_devdata(file);
 123         struct camera_data *cam = video_get_drvdata(dev);
 124
 125         mutex_lock(&cam->v4l2_lock);
 126         if (video_is_registered(&cam->vdev) && v4l2_fh_is_singular_file(file)) {
 127                 cpia2_usb_stream_stop(cam);
 128
 129                 /* save camera state for later open */
 130                 cpia2_save_camera_state(cam);
 131
 132                 cpia2_set_low_power(cam);
 133                 cpia2_free_buffers(cam);
 134         }
 135
 136         if (cam->stream_fh == file->private_data) {
 137                 cam->stream_fh = NULL;
 138                 cam->mmapped = 0;
 139         }
 140         mutex_unlock(&cam->v4l2_lock);
 141         return v4l2_fh_release(file);
 142 }
 143
 144 /******************************************************************************
 145  *
 146  *  cpia2_v4l_read
 147  *
 148  *****************************************************************************/
 149 static ssize_t cpia2_v4l_read(struct file *file, char __user *buf, size_t count,
 150                               loff_t *off)
 151 {
 152         struct camera_data *cam = video_drvdata(file);
 153         int noblock = file->f_flags&O_NONBLOCK;
 154         ssize_t ret;
 155
 156         if(!cam)
 157                 return -EINVAL;
 158
 159         if (mutex_lock_interruptible(&cam->v4l2_lock))
 160                 return -ERESTARTSYS;
 161         ret = cpia2_read(cam, buf, count, noblock);
 162         mutex_unlock(&cam->v4l2_lock);
 163         return ret;
 164 }
 165
 166
 167 /******************************************************************************
 168  *
 169  *  cpia2_v4l_poll
 170  *
 171  *****************************************************************************/
 172 static __poll_t cpia2_v4l_poll(struct file *filp, struct poll_table_struct *wait)
 173 {
 174         struct camera_data *cam = video_drvdata(filp);
 175         __poll_t res;
 176
 177         mutex_lock(&cam->v4l2_lock);
 178         res = cpia2_poll(cam, filp, wait);
 179         mutex_unlock(&cam->v4l2_lock);
 180         return res;
 181 }
 182
 183
 184 static int sync(struct camera_data *cam, int frame_nr)
 185 {
 186         struct framebuf *frame = &cam->buffers[frame_nr];
 187
 188         while (1) {
 189                 if (frame->status == FRAME_READY)
 190                         return 0;
 191
 192                 if (!cam->streaming) {
 193                         frame->status = FRAME_READY;
 194                         frame->length = 0;
 195                         return 0;
 196                 }
 197
 198                 mutex_unlock(&cam->v4l2_lock);
 199                 wait_event_interruptible(cam->wq_stream,
 200                                          !cam->streaming ||
 201                                          frame->status == FRAME_READY);
 202                 mutex_lock(&cam->v4l2_lock);
 203                 if (signal_pending(current))
 204                         return -ERESTARTSYS;
 205                 if (!video_is_registered(&cam->vdev))
 206                         return -ENOTTY;
 207         }
 208 }
 209
 210 /******************************************************************************
 211  *
 212  *  ioctl_querycap
 213  *
 214  *  V4L2 device capabilities
 215  *
 216  *****************************************************************************/
 217
 218 static int cpia2_querycap(struct file *file, void *fh, struct v4l2_capability *vc)
 219 {
 220         struct camera_data *cam = video_drvdata(file);
 221
 222         strscpy(vc->driver, "cpia2", sizeof(vc->driver));
 223
 224         if (cam->params.pnp_id.product == 0x151)
 225                 strscpy(vc->card, "QX5 Microscope", sizeof(vc->card));
 226         else
 227                 strscpy(vc->card, "CPiA2 Camera", sizeof(vc->card));
 228         switch (cam->params.pnp_id.device_type) {
 229         case DEVICE_STV_672:
 230                 strcat(vc->card, " (672/");
 231                 break;
 232         case DEVICE_STV_676:
 233                 strcat(vc->card, " (676/");
 234                 break;
 235         default:
 236                 strcat(vc->card, " (XXX/");
 237                 break;
 238         }
 239         switch (cam->params.version.sensor_flags) {
 240         case CPIA2_VP_SENSOR_FLAGS_404:
 241                 strcat(vc->card, "404)");
 242                 break;
 243         case CPIA2_VP_SENSOR_FLAGS_407:
 244                 strcat(vc->card, "407)");
 245                 break;
 246         case CPIA2_VP_SENSOR_FLAGS_409:
 247                 strcat(vc->card, "409)");
 248                 break;
 249         case CPIA2_VP_SENSOR_FLAGS_410:
 250                 strcat(vc->card, "410)");
 251                 break;
 252         case CPIA2_VP_SENSOR_FLAGS_500:
 253                 strcat(vc->card, "500)");
 254                 break;
 255         default:
 256                 strcat(vc->card, "XXX)");
 257                 break;
 258         }
 259
 260         if (usb_make_path(cam->dev, vc->bus_info, sizeof(vc->bus_info)) <0)
 261                 memset(vc->bus_info,0, sizeof(vc->bus_info));
 262
 263         vc->device_caps = V4L2_CAP_VIDEO_CAPTURE |
 264                            V4L2_CAP_READWRITE |
 265                            V4L2_CAP_STREAMING;
 266         vc->capabilities = vc->device_caps |
 267                            V4L2_CAP_DEVICE_CAPS;
 268
 269         return 0;
 270 }
 271
 272 /******************************************************************************
 273  *
 274  *  ioctl_input
 275  *
 276  *  V4L2 input get/set/enumerate
 277  *
 278  *****************************************************************************/
 279
 280 static int cpia2_enum_input(struct file *file, void *fh, struct v4l2_input *i)
 281 {
 282         if (i->index)
 283                 return -EINVAL;
 284         strscpy(i->name, "Camera", sizeof(i->name));
 285         i->type = V4L2_INPUT_TYPE_CAMERA;
 286         return 0;
 287 }
 288
 289 static int cpia2_g_input(struct file *file, void *fh, unsigned int *i)
 290 {
 291         *i = 0;
 292         return 0;
 293 }
 294
 295 static int cpia2_s_input(struct file *file, void *fh, unsigned int i)
 296 {
 297         return i ? -EINVAL : 0;
 298 }
 299
 300 /******************************************************************************
 301  *
 302  *  ioctl_enum_fmt
 303  *
 304  *  V4L2 format enumerate
 305  *
 306  *****************************************************************************/
 307
 308 static int cpia2_enum_fmt_vid_cap(struct file *file, void *fh,
 309                                             struct v4l2_fmtdesc *f)
 310 {
 311         int index = f->index;
 312
 313         if (index < 0 || index > 1)
 314                return -EINVAL;
 315
 316         memset(f, 0, sizeof(*f));
 317         f->index = index;
 318         f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 319         f->flags = V4L2_FMT_FLAG_COMPRESSED;
 320         switch(index) {
 321         case 0:
 322                 strscpy(f->description, "MJPEG", sizeof(f->description));
 323                 f->pixelformat = V4L2_PIX_FMT_MJPEG;
 324                 break;
 325         case 1:
 326                 strscpy(f->description, "JPEG", sizeof(f->description));
 327                 f->pixelformat = V4L2_PIX_FMT_JPEG;
 328                 break;
 329         default:
 330                 return -EINVAL;
 331         }
 332
 333         return 0;
 334 }
 335
 336 /******************************************************************************
 337  *
 338  *  ioctl_try_fmt
 339  *
 340  *  V4L2 format try
 341  *
 342  *****************************************************************************/
 343
 344 static int cpia2_try_fmt_vid_cap(struct file *file, void *fh,
 345                                           struct v4l2_format *f)
 346 {
 347         struct camera_data *cam = video_drvdata(file);
 348
 349         if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_MJPEG &&
 350             f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
 351                return -EINVAL;
 352
 353         f->fmt.pix.field = V4L2_FIELD_NONE;
 354         f->fmt.pix.bytesperline = 0;
 355         f->fmt.pix.sizeimage = cam->frame_size;
 356         f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
 357         f->fmt.pix.priv = 0;
 358
 359         switch (cpia2_match_video_size(f->fmt.pix.width, f->fmt.pix.height)) {
 360         case VIDEOSIZE_VGA:
 361                 f->fmt.pix.width = 640;
 362                 f->fmt.pix.height = 480;
 363                 break;
 364         case VIDEOSIZE_CIF:
 365                 f->fmt.pix.width = 352;
 366                 f->fmt.pix.height = 288;
 367                 break;
 368         case VIDEOSIZE_QVGA:
 369                 f->fmt.pix.width = 320;
 370                 f->fmt.pix.height = 240;
 371                 break;
 372         case VIDEOSIZE_288_216:
 373                 f->fmt.pix.width = 288;
 374                 f->fmt.pix.height = 216;
 375                 break;
 376         case VIDEOSIZE_256_192:
 377                 f->fmt.pix.width = 256;
 378                 f->fmt.pix.height = 192;
 379                 break;
 380         case VIDEOSIZE_224_168:
 381                 f->fmt.pix.width = 224;
 382                 f->fmt.pix.height = 168;
 383                 break;
 384         case VIDEOSIZE_192_144:
 385                 f->fmt.pix.width = 192;
 386                 f->fmt.pix.height = 144;
 387                 break;
 388         case VIDEOSIZE_QCIF:
 389         default:
 390                 f->fmt.pix.width = 176;
 391                 f->fmt.pix.height = 144;
 392                 break;
 393         }
 394
 395         return 0;
 396 }
 397
 398 /******************************************************************************
 399  *
 400  *  ioctl_set_fmt
 401  *
 402  *  V4L2 format set
 403  *
 404  *****************************************************************************/
 405
 406 static int cpia2_s_fmt_vid_cap(struct file *file, void *_fh,
 407                                         struct v4l2_format *f)
 408 {
 409         struct camera_data *cam = video_drvdata(file);
 410         int err, frame;
 411
 412         err = cpia2_try_fmt_vid_cap(file, _fh, f);
 413         if(err != 0)
 414                 return err;
 415
 416         cam->pixelformat = f->fmt.pix.pixelformat;
 417
 418         /* NOTE: This should be set to 1 for MJPEG, but some apps don't handle
 419          * the missing Huffman table properly. */
 420         cam->params.compression.inhibit_htables = 0;
 421                 /*f->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG;*/
 422
 423         /* we set the video window to something smaller or equal to what
 424          * is requested by the user???
 425          */
 426         DBG("Requested width = %d, height = %d\n",
 427             f->fmt.pix.width, f->fmt.pix.height);
 428         if (f->fmt.pix.width != cam->width ||
 429             f->fmt.pix.height != cam->height) {
 430                 cam->width = f->fmt.pix.width;
 431                 cam->height = f->fmt.pix.height;
 432                 cam->params.roi.width = f->fmt.pix.width;
 433                 cam->params.roi.height = f->fmt.pix.height;
 434                 cpia2_set_format(cam);
 435         }
 436
 437         for (frame = 0; frame < cam->num_frames; ++frame) {
 438                 if (cam->buffers[frame].status == FRAME_READING)
 439                         if ((err = sync(cam, frame)) < 0)
 440                                 return err;
 441
 442                 cam->buffers[frame].status = FRAME_EMPTY;
 443         }
 444
 445         return 0;
 446 }
 447
 448 /******************************************************************************
 449  *
 450  *  ioctl_get_fmt
 451  *
 452  *  V4L2 format get
 453  *
 454  *****************************************************************************/
 455
 456 static int cpia2_g_fmt_vid_cap(struct file *file, void *fh,
 457                                         struct v4l2_format *f)
 458 {
 459         struct camera_data *cam = video_drvdata(file);
 460
 461         f->fmt.pix.width = cam->width;
 462         f->fmt.pix.height = cam->height;
 463         f->fmt.pix.pixelformat = cam->pixelformat;
 464         f->fmt.pix.field = V4L2_FIELD_NONE;
 465         f->fmt.pix.bytesperline = 0;
 466         f->fmt.pix.sizeimage = cam->frame_size;
 467         f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
 468         f->fmt.pix.priv = 0;
 469
 470         return 0;
 471 }
 472
 473 /******************************************************************************
 474  *
 475  *  ioctl_cropcap
 476  *
 477  *  V4L2 query cropping capabilities
 478  *  NOTE: cropping is currently disabled
 479  *
 480  *****************************************************************************/
 481
 482 static int cpia2_cropcap(struct file *file, void *fh, struct v4l2_cropcap *c)
 483 {
 484         struct camera_data *cam = video_drvdata(file);
 485
 486         if (c->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 487                return -EINVAL;
 488
 489         c->bounds.left = 0;
 490         c->bounds.top = 0;
 491         c->bounds.width = cam->width;
 492         c->bounds.height = cam->height;
 493         c->defrect.left = 0;
 494         c->defrect.top = 0;
 495         c->defrect.width = cam->width;
 496         c->defrect.height = cam->height;
 497         c->pixelaspect.numerator = 1;
 498         c->pixelaspect.denominator = 1;
 499
 500         return 0;
 501 }
 502
 503 struct framerate_info {
 504         int value;
 505         struct v4l2_fract period;
 506 };
 507
 508 static const struct framerate_info framerate_controls[] = {
 509         { CPIA2_VP_FRAMERATE_6_25, { 4, 25 } },
 510         { CPIA2_VP_FRAMERATE_7_5,  { 2, 15 } },
 511         { CPIA2_VP_FRAMERATE_12_5, { 2, 25 } },
 512         { CPIA2_VP_FRAMERATE_15,   { 1, 15 } },
 513         { CPIA2_VP_FRAMERATE_25,   { 1, 25 } },
 514         { CPIA2_VP_FRAMERATE_30,   { 1, 30 } },
 515 };
 516
 517 static int cpia2_g_parm(struct file *file, void *fh, struct v4l2_streamparm *p)
 518 {
 519         struct camera_data *cam = video_drvdata(file);
 520         struct v4l2_captureparm *cap = &p->parm.capture;
 521         int i;
 522
 523         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 524                 return -EINVAL;
 525
 526         cap->capability = V4L2_CAP_TIMEPERFRAME;
 527         cap->readbuffers = cam->num_frames;
 528         for (i = 0; i < ARRAY_SIZE(framerate_controls); i++)
 529                 if (cam->params.vp_params.frame_rate == framerate_controls[i].value) {
 530                         cap->timeperframe = framerate_controls[i].period;
 531                         break;
 532                 }
 533         return 0;
 534 }
 535
 536 static int cpia2_s_parm(struct file *file, void *fh, struct v4l2_streamparm *p)
 537 {
 538         struct camera_data *cam = video_drvdata(file);
 539         struct v4l2_captureparm *cap = &p->parm.capture;
 540         struct v4l2_fract tpf = cap->timeperframe;
 541         int max = ARRAY_SIZE(framerate_controls) - 1;
 542         int ret;
 543         int i;
 544
 545         ret = cpia2_g_parm(file, fh, p);
 546         if (ret || !tpf.denominator || !tpf.numerator)
 547                 return ret;
 548
 549         /* Maximum 15 fps for this model */
 550         if (cam->params.pnp_id.device_type == DEVICE_STV_672 &&
 551             cam->params.version.sensor_flags == CPIA2_VP_SENSOR_FLAGS_500)
 552                 max -= 2;
 553         for (i = 0; i <= max; i++) {
 554                 struct v4l2_fract f1 = tpf;
 555                 struct v4l2_fract f2 = framerate_controls[i].period;
 556
 557                 f1.numerator *= f2.denominator;
 558                 f2.numerator *= f1.denominator;
 559                 if (f1.numerator >= f2.numerator)
 560                         break;
 561         }
 562         if (i > max)
 563                 i = max;
 564         cap->timeperframe = framerate_controls[i].period;
 565         return cpia2_set_fps(cam, framerate_controls[i].value);
 566 }
 567
 568 static const struct {
 569         u32 width;
 570         u32 height;
 571 } cpia2_framesizes[] = {
 572         { 640, 480 },
 573         { 352, 288 },
 574         { 320, 240 },
 575         { 288, 216 },
 576         { 256, 192 },
 577         { 224, 168 },
 578         { 192, 144 },
 579         { 176, 144 },
 580 };
 581
 582 static int cpia2_enum_framesizes(struct file *file, void *fh,
 583                                          struct v4l2_frmsizeenum *fsize)
 584 {
 585
 586         if (fsize->pixel_format != V4L2_PIX_FMT_MJPEG &&
 587             fsize->pixel_format != V4L2_PIX_FMT_JPEG)
 588                 return -EINVAL;
 589         if (fsize->index >= ARRAY_SIZE(cpia2_framesizes))
 590                 return -EINVAL;
 591         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 592         fsize->discrete.width = cpia2_framesizes[fsize->index].width;
 593         fsize->discrete.height = cpia2_framesizes[fsize->index].height;
 594
 595         return 0;
 596 }
 597
 598 static int cpia2_enum_frameintervals(struct file *file, void *fh,
 599                                            struct v4l2_frmivalenum *fival)
 600 {
 601         struct camera_data *cam = video_drvdata(file);
 602         int max = ARRAY_SIZE(framerate_controls) - 1;
 603         int i;
 604
 605         if (fival->pixel_format != V4L2_PIX_FMT_MJPEG &&
 606             fival->pixel_format != V4L2_PIX_FMT_JPEG)
 607                 return -EINVAL;
 608
 609         /* Maximum 15 fps for this model */
 610         if (cam->params.pnp_id.device_type == DEVICE_STV_672 &&
 611             cam->params.version.sensor_flags == CPIA2_VP_SENSOR_FLAGS_500)
 612                 max -= 2;
 613         if (fival->index > max)
 614                 return -EINVAL;
 615         for (i = 0; i < ARRAY_SIZE(cpia2_framesizes); i++)
 616                 if (fival->width == cpia2_framesizes[i].width &&
 617                     fival->height == cpia2_framesizes[i].height)
 618                         break;
 619         if (i == ARRAY_SIZE(cpia2_framesizes))
 620                 return -EINVAL;
 621         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 622         fival->discrete = framerate_controls[fival->index].period;
 623         return 0;
 624 }
 625
 626 /******************************************************************************
 627  *
 628  *  ioctl_s_ctrl
 629  *
 630  *  V4L2 set the value of a control variable
 631  *
 632  *****************************************************************************/
 633
 634 static int cpia2_s_ctrl(struct v4l2_ctrl *ctrl)
 635 {
 636         struct camera_data *cam =
 637                 container_of(ctrl->handler, struct camera_data, hdl);
 638         static const int flicker_table[] = {
 639                 NEVER_FLICKER,
 640                 FLICKER_50,
 641                 FLICKER_60,
 642         };
 643
 644         DBG("Set control id:%d, value:%d\n", ctrl->id, ctrl->val);
 645
 646         switch (ctrl->id) {
 647         case V4L2_CID_BRIGHTNESS:
 648                 cpia2_set_brightness(cam, ctrl->val);
 649                 break;
 650         case V4L2_CID_CONTRAST:
 651                 cpia2_set_contrast(cam, ctrl->val);
 652                 break;
 653         case V4L2_CID_SATURATION:
 654                 cpia2_set_saturation(cam, ctrl->val);
 655                 break;
 656         case V4L2_CID_HFLIP:
 657                 cpia2_set_property_mirror(cam, ctrl->val);
 658                 break;
 659         case V4L2_CID_VFLIP:
 660                 cpia2_set_property_flip(cam, ctrl->val);
 661                 break;
 662         case V4L2_CID_POWER_LINE_FREQUENCY:
 663                 return cpia2_set_flicker_mode(cam, flicker_table[ctrl->val]);
 664         case V4L2_CID_ILLUMINATORS_1:
 665                 return cpia2_set_gpio(cam, (cam->top_light->val << 6) |
 666                                            (cam->bottom_light->val << 7));
 667         case V4L2_CID_JPEG_ACTIVE_MARKER:
 668                 cam->params.compression.inhibit_htables =
 669                         !(ctrl->val & V4L2_JPEG_ACTIVE_MARKER_DHT);
 670                 break;
 671         case V4L2_CID_JPEG_COMPRESSION_QUALITY:
 672                 cam->params.vc_params.quality = ctrl->val;
 673                 break;
 674         case CPIA2_CID_USB_ALT:
 675                 cam->params.camera_state.stream_mode = ctrl->val;
 676                 break;
 677         default:
 678                 return -EINVAL;
 679         }
 680
 681         return 0;
 682 }
 683
 684 /******************************************************************************
 685  *
 686  *  ioctl_g_jpegcomp
 687  *
 688  *  V4L2 get the JPEG compression parameters
 689  *
 690  *****************************************************************************/
 691
 692 static int cpia2_g_jpegcomp(struct file *file, void *fh, struct v4l2_jpegcompression *parms)
 693 {
 694         struct camera_data *cam = video_drvdata(file);
 695
 696         memset(parms, 0, sizeof(*parms));
 697
 698         parms->quality = 80; // TODO: Can this be made meaningful?
 699
 700         parms->jpeg_markers = V4L2_JPEG_MARKER_DQT | V4L2_JPEG_MARKER_DRI;
 701         if(!cam->params.compression.inhibit_htables) {
 702                 parms->jpeg_markers |= V4L2_JPEG_MARKER_DHT;
 703         }
 704
 705         parms->APPn = cam->APPn;
 706         parms->APP_len = cam->APP_len;
 707         if(cam->APP_len > 0) {
 708                 memcpy(parms->APP_data, cam->APP_data, cam->APP_len);
 709                 parms->jpeg_markers |= V4L2_JPEG_MARKER_APP;
 710         }
 711
 712         parms->COM_len = cam->COM_len;
 713         if(cam->COM_len > 0) {
 714                 memcpy(parms->COM_data, cam->COM_data, cam->COM_len);
 715                 parms->jpeg_markers |= JPEG_MARKER_COM;
 716         }
 717
 718         DBG("G_JPEGCOMP APP_len:%d COM_len:%d\n",
 719             parms->APP_len, parms->COM_len);
 720
 721         return 0;
 722 }
 723
 724 /******************************************************************************
 725  *
 726  *  ioctl_s_jpegcomp
 727  *
 728  *  V4L2 set the JPEG compression parameters
 729  *  NOTE: quality and some jpeg_markers are ignored.
 730  *
 731  *****************************************************************************/
 732
 733 static int cpia2_s_jpegcomp(struct file *file, void *fh,
 734                 const struct v4l2_jpegcompression *parms)
 735 {
 736         struct camera_data *cam = video_drvdata(file);
 737
 738         DBG("S_JPEGCOMP APP_len:%d COM_len:%d\n",
 739             parms->APP_len, parms->COM_len);
 740
 741         cam->params.compression.inhibit_htables =
 742                 !(parms->jpeg_markers & V4L2_JPEG_MARKER_DHT);
 743
 744         if(parms->APP_len != 0) {
 745                 if(parms->APP_len > 0 &&
 746                    parms->APP_len <= sizeof(cam->APP_data) &&
 747                    parms->APPn >= 0 && parms->APPn <= 15) {
 748                         cam->APPn = parms->APPn;
 749                         cam->APP_len = parms->APP_len;
 750                         memcpy(cam->APP_data, parms->APP_data, parms->APP_len);
 751                 } else {
 752                         LOG("Bad APPn Params n=%d len=%d\n",
 753                             parms->APPn, parms->APP_len);
 754                         return -EINVAL;
 755                 }
 756         } else {
 757                 cam->APP_len = 0;
 758         }
 759
 760         if(parms->COM_len != 0) {
 761                 if(parms->COM_len > 0 &&
 762                    parms->COM_len <= sizeof(cam->COM_data)) {
 763                         cam->COM_len = parms->COM_len;
 764                         memcpy(cam->COM_data, parms->COM_data, parms->COM_len);
 765                 } else {
 766                         LOG("Bad COM_len=%d\n", parms->COM_len);
 767                         return -EINVAL;
 768                 }
 769         }
 770
 771         return 0;
 772 }
 773
 774 /******************************************************************************
 775  *
 776  *  ioctl_reqbufs
 777  *
 778  *  V4L2 Initiate memory mapping.
 779  *  NOTE: The user's request is ignored. For now the buffers are fixed.
 780  *
 781  *****************************************************************************/
 782
 783 static int cpia2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *req)
 784 {
 785         struct camera_data *cam = video_drvdata(file);
 786
 787         if(req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 788            req->memory != V4L2_MEMORY_MMAP)
 789                 return -EINVAL;
 790
 791         DBG("REQBUFS requested:%d returning:%d\n", req->count, cam->num_frames);
 792         req->count = cam->num_frames;
 793         memset(&req->reserved, 0, sizeof(req->reserved));
 794
 795         return 0;
 796 }
 797
 798 /******************************************************************************
 799  *
 800  *  ioctl_querybuf
 801  *
 802  *  V4L2 Query memory buffer status.
 803  *
 804  *****************************************************************************/
 805
 806 static int cpia2_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 807 {
 808         struct camera_data *cam = video_drvdata(file);
 809
 810         if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 811            buf->index >= cam->num_frames)
 812                 return -EINVAL;
 813
 814         buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
 815         buf->length = cam->frame_size;
 816
 817         buf->memory = V4L2_MEMORY_MMAP;
 818
 819         if(cam->mmapped)
 820                 buf->flags = V4L2_BUF_FLAG_MAPPED;
 821         else
 822                 buf->flags = 0;
 823
 824         buf->flags |= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 825
 826         switch (cam->buffers[buf->index].status) {
 827         case FRAME_EMPTY:
 828         case FRAME_ERROR:
 829         case FRAME_READING:
 830                 buf->bytesused = 0;
 831                 buf->flags = V4L2_BUF_FLAG_QUEUED;
 832                 break;
 833         case FRAME_READY:
 834                 buf->bytesused = cam->buffers[buf->index].length;
 835                 buf->timestamp = cam->buffers[buf->index].timestamp;
 836                 buf->sequence = cam->buffers[buf->index].seq;
 837                 buf->flags = V4L2_BUF_FLAG_DONE;
 838                 break;
 839         }
 840
 841         DBG("QUERYBUF index:%d offset:%d flags:%d seq:%d bytesused:%d\n",
 842              buf->index, buf->m.offset, buf->flags, buf->sequence,
 843              buf->bytesused);
 844
 845         return 0;
 846 }
 847
 848 /******************************************************************************
 849  *
 850  *  ioctl_qbuf
 851  *
 852  *  V4L2 User is freeing buffer
 853  *
 854  *****************************************************************************/
 855
 856 static int cpia2_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 857 {
 858         struct camera_data *cam = video_drvdata(file);
 859
 860         if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 861            buf->memory != V4L2_MEMORY_MMAP ||
 862            buf->index >= cam->num_frames)
 863                 return -EINVAL;
 864
 865         DBG("QBUF #%d\n", buf->index);
 866
 867         if(cam->buffers[buf->index].status == FRAME_READY)
 868                 cam->buffers[buf->index].status = FRAME_EMPTY;
 869
 870         return 0;
 871 }
 872
 873 /******************************************************************************
 874  *
 875  *  find_earliest_filled_buffer
 876  *
 877  *  Helper for ioctl_dqbuf. Find the next ready buffer.
 878  *
 879  *****************************************************************************/
 880
 881 static int find_earliest_filled_buffer(struct camera_data *cam)
 882 {
 883         int i;
 884         int found = -1;
 885         for (i=0; i<cam->num_frames; i++) {
 886                 if(cam->buffers[i].status == FRAME_READY) {
 887                         if(found < 0) {
 888                                 found = i;
 889                         } else {
 890                                 /* find which buffer is earlier */
 891                                 struct timeval *tv1, *tv2;
 892                                 tv1 = &cam->buffers[i].timestamp;
 893                                 tv2 = &cam->buffers[found].timestamp;
 894                                 if(tv1->tv_sec < tv2->tv_sec ||
 895                                    (tv1->tv_sec == tv2->tv_sec &&
 896                                     tv1->tv_usec < tv2->tv_usec))
 897                                         found = i;
 898                         }
 899                 }
 900         }
 901         return found;
 902 }
 903
 904 /******************************************************************************
 905  *
 906  *  ioctl_dqbuf
 907  *
 908  *  V4L2 User is asking for a filled buffer.
 909  *
 910  *****************************************************************************/
 911
 912 static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 913 {
 914         struct camera_data *cam = video_drvdata(file);
 915         int frame;
 916
 917         if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 918            buf->memory != V4L2_MEMORY_MMAP)
 919                 return -EINVAL;
 920
 921         frame = find_earliest_filled_buffer(cam);
 922
 923         if(frame < 0 && file->f_flags&O_NONBLOCK)
 924                 return -EAGAIN;
 925
 926         if(frame < 0) {
 927                 /* Wait for a frame to become available */
 928                 struct framebuf *cb=cam->curbuff;
 929                 mutex_unlock(&cam->v4l2_lock);
 930                 wait_event_interruptible(cam->wq_stream,
 931                                          !video_is_registered(&cam->vdev) ||
 932                                          (cb=cam->curbuff)->status == FRAME_READY);
 933                 mutex_lock(&cam->v4l2_lock);
 934                 if (signal_pending(current))
 935                         return -ERESTARTSYS;
 936                 if (!video_is_registered(&cam->vdev))
 937                         return -ENOTTY;
 938                 frame = cb->num;
 939         }
 940
 941
 942         buf->index = frame;
 943         buf->bytesused = cam->buffers[buf->index].length;
 944         buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE
 945                 | V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 946         buf->field = V4L2_FIELD_NONE;
 947         buf->timestamp = cam->buffers[buf->index].timestamp;
 948         buf->sequence = cam->buffers[buf->index].seq;
 949         buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
 950         buf->length = cam->frame_size;
 951         buf->reserved2 = 0;
 952         buf->request_fd = 0;
 953         memset(&buf->timecode, 0, sizeof(buf->timecode));
 954
 955         DBG("DQBUF #%d status:%d seq:%d length:%d\n", buf->index,
 956             cam->buffers[buf->index].status, buf->sequence, buf->bytesused);
 957
 958         return 0;
 959 }
 960
 961 static int cpia2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 962 {
 963         struct camera_data *cam = video_drvdata(file);
 964         int ret = -EINVAL;
 965
 966         DBG("VIDIOC_STREAMON, streaming=%d\n", cam->streaming);
 967         if (!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 968                 return -EINVAL;
 969
 970         if (!cam->streaming) {
 971                 ret = cpia2_usb_stream_start(cam,
 972                                 cam->params.camera_state.stream_mode);
 973                 if (!ret)
 974                         v4l2_ctrl_grab(cam->usb_alt, true);
 975         }
 976         return ret;
 977 }
 978
 979 static int cpia2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 980 {
 981         struct camera_data *cam = video_drvdata(file);
 982         int ret = -EINVAL;
 983
 984         DBG("VIDIOC_STREAMOFF, streaming=%d\n", cam->streaming);
 985         if (!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 986                 return -EINVAL;
 987
 988         if (cam->streaming) {
 989                 ret = cpia2_usb_stream_stop(cam);
 990                 if (!ret)
 991                         v4l2_ctrl_grab(cam->usb_alt, false);
 992         }
 993         return ret;
 994 }
 995
 996 /******************************************************************************
 997  *
 998  *  cpia2_mmap
 999  *
1000  *****************************************************************************/
1001 static int cpia2_mmap(struct file *file, struct vm_area_struct *area)
1002 {
1003         struct camera_data *cam = video_drvdata(file);
1004         int retval;
1005
1006         if (mutex_lock_interruptible(&cam->v4l2_lock))
1007                 return -ERESTARTSYS;
1008         retval = cpia2_remap_buffer(cam, area);
1009
1010         if(!retval)
1011                 cam->stream_fh = file->private_data;
1012         mutex_unlock(&cam->v4l2_lock);
1013         return retval;
1014 }
1015
1016 /******************************************************************************
1017  *
1018  *  reset_camera_struct_v4l
1019  *
1020  *  Sets all values to the defaults
1021  *****************************************************************************/
1022 static void reset_camera_struct_v4l(struct camera_data *cam)
1023 {
1024         cam->width = cam->params.roi.width;
1025         cam->height = cam->params.roi.height;
1026
1027         cam->frame_size = buffer_size;
1028         cam->num_frames = num_buffers;
1029
1030         /* Flicker modes */
1031         cam->params.flicker_control.flicker_mode_req = flicker_mode;
1032
1033         /* stream modes */
1034         cam->params.camera_state.stream_mode = alternate;
1035
1036         cam->pixelformat = V4L2_PIX_FMT_JPEG;
1037 }
1038
1039 static const struct v4l2_ioctl_ops cpia2_ioctl_ops = {
1040         .vidioc_querycap                    = cpia2_querycap,
1041         .vidioc_enum_input                  = cpia2_enum_input,
1042         .vidioc_g_input                     = cpia2_g_input,
1043         .vidioc_s_input                     = cpia2_s_input,
1044         .vidioc_enum_fmt_vid_cap            = cpia2_enum_fmt_vid_cap,
1045         .vidioc_g_fmt_vid_cap               = cpia2_g_fmt_vid_cap,
1046         .vidioc_s_fmt_vid_cap               = cpia2_s_fmt_vid_cap,
1047         .vidioc_try_fmt_vid_cap             = cpia2_try_fmt_vid_cap,
1048         .vidioc_g_jpegcomp                  = cpia2_g_jpegcomp,
1049         .vidioc_s_jpegcomp                  = cpia2_s_jpegcomp,
1050         .vidioc_cropcap                     = cpia2_cropcap,
1051         .vidioc_reqbufs                     = cpia2_reqbufs,
1052         .vidioc_querybuf                    = cpia2_querybuf,
1053         .vidioc_qbuf                        = cpia2_qbuf,
1054         .vidioc_dqbuf                       = cpia2_dqbuf,
1055         .vidioc_streamon                    = cpia2_streamon,
1056         .vidioc_streamoff                   = cpia2_streamoff,
1057         .vidioc_s_parm                      = cpia2_s_parm,
1058         .vidioc_g_parm                      = cpia2_g_parm,
1059         .vidioc_enum_framesizes             = cpia2_enum_framesizes,
1060         .vidioc_enum_frameintervals         = cpia2_enum_frameintervals,
1061         .vidioc_subscribe_event             = v4l2_ctrl_subscribe_event,
1062         .vidioc_unsubscribe_event           = v4l2_event_unsubscribe,
1063 };
1064
1065 /***
1066  * The v4l video device structure initialized for this device
1067  ***/
1068 static const struct v4l2_file_operations cpia2_fops = {
1069         .owner          = THIS_MODULE,
1070         .open           = cpia2_open,
1071         .release        = cpia2_close,
1072         .read           = cpia2_v4l_read,
1073         .poll           = cpia2_v4l_poll,
1074         .unlocked_ioctl = video_ioctl2,
1075         .mmap           = cpia2_mmap,
1076 };
1077
1078 static const struct video_device cpia2_template = {
1079         /* I could not find any place for the old .initialize initializer?? */
1080         .name =         "CPiA2 Camera",
1081         .fops =         &cpia2_fops,
1082         .ioctl_ops =    &cpia2_ioctl_ops,
1083         .release =      video_device_release_empty,
1084 };
1085
1086 void cpia2_camera_release(struct v4l2_device *v4l2_dev)
1087 {
1088         struct camera_data *cam =
1089                 container_of(v4l2_dev, struct camera_data, v4l2_dev);
1090
1091         v4l2_ctrl_handler_free(&cam->hdl);
1092         v4l2_device_unregister(&cam->v4l2_dev);
1093         kfree(cam);
1094 }
1095
1096 static const struct v4l2_ctrl_ops cpia2_ctrl_ops = {
1097         .s_ctrl = cpia2_s_ctrl,
1098 };
1099
1100 /******************************************************************************
1101  *
1102  *  cpia2_register_camera
1103  *
1104  *****************************************************************************/
1105 int cpia2_register_camera(struct camera_data *cam)
1106 {
1107         struct v4l2_ctrl_handler *hdl = &cam->hdl;
1108         struct v4l2_ctrl_config cpia2_usb_alt = {
1109                 .ops = &cpia2_ctrl_ops,
1110                 .id = CPIA2_CID_USB_ALT,
1111                 .name = "USB Alternate",
1112                 .type = V4L2_CTRL_TYPE_INTEGER,
1113                 .min = USBIF_ISO_1,
1114                 .max = USBIF_ISO_6,
1115                 .step = 1,
1116         };
1117         int ret;
1118
1119         v4l2_ctrl_handler_init(hdl, 12);
1120         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1121                         V4L2_CID_BRIGHTNESS,
1122                         cam->params.pnp_id.device_type == DEVICE_STV_672 ? 1 : 0,
1123                         255, 1, DEFAULT_BRIGHTNESS);
1124         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1125                         V4L2_CID_CONTRAST, 0, 255, 1, DEFAULT_CONTRAST);
1126         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1127                         V4L2_CID_SATURATION, 0, 255, 1, DEFAULT_SATURATION);
1128         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1129                         V4L2_CID_HFLIP, 0, 1, 1, 0);
1130         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1131                         V4L2_CID_JPEG_ACTIVE_MARKER, 0,
1132                         V4L2_JPEG_ACTIVE_MARKER_DHT, 0,
1133                         V4L2_JPEG_ACTIVE_MARKER_DHT);
1134         v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1135                         V4L2_CID_JPEG_COMPRESSION_QUALITY, 1,
1136                         100, 1, 100);
1137         cpia2_usb_alt.def = alternate;
1138         cam->usb_alt = v4l2_ctrl_new_custom(hdl, &cpia2_usb_alt, NULL);
1139         /* VP5 Only */
1140         if (cam->params.pnp_id.device_type != DEVICE_STV_672)
1141                 v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1142                         V4L2_CID_VFLIP, 0, 1, 1, 0);
1143         /* Flicker control only valid for 672 */
1144         if (cam->params.pnp_id.device_type == DEVICE_STV_672)
1145                 v4l2_ctrl_new_std_menu(hdl, &cpia2_ctrl_ops,
1146                         V4L2_CID_POWER_LINE_FREQUENCY,
1147                         V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0, 0);
1148         /* Light control only valid for the QX5 Microscope */
1149         if (cam->params.pnp_id.product == 0x151) {
1150                 cam->top_light = v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1151                                 V4L2_CID_ILLUMINATORS_1, 0, 1, 1, 0);
1152                 cam->bottom_light = v4l2_ctrl_new_std(hdl, &cpia2_ctrl_ops,
1153                                 V4L2_CID_ILLUMINATORS_2, 0, 1, 1, 0);
1154                 v4l2_ctrl_cluster(2, &cam->top_light);
1155         }
1156
1157         if (hdl->error) {
1158                 ret = hdl->error;
1159                 v4l2_ctrl_handler_free(hdl);
1160                 return ret;
1161         }
1162
1163         cam->vdev = cpia2_template;
1164         video_set_drvdata(&cam->vdev, cam);
1165         cam->vdev.lock = &cam->v4l2_lock;
1166         cam->vdev.ctrl_handler = hdl;
1167         cam->vdev.v4l2_dev = &cam->v4l2_dev;
1168
1169         reset_camera_struct_v4l(cam);
1170
1171         /* register v4l device */
1172         if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
1173                 ERR("video_register_device failed\n");
1174                 return -ENODEV;
1175         }
1176
1177         return 0;
1178 }
1179
1180 /******************************************************************************
1181  *
1182  *  cpia2_unregister_camera
1183  *
1184  *****************************************************************************/
1185 void cpia2_unregister_camera(struct camera_data *cam)
1186 {
1187         video_unregister_device(&cam->vdev);
1188 }
1189
1190 /******************************************************************************
1191  *
1192  *  check_parameters
1193  *
1194  *  Make sure that all user-supplied parameters are sensible
1195  *****************************************************************************/
1196 static void __init check_parameters(void)
1197 {
1198         if(buffer_size < PAGE_SIZE) {
1199                 buffer_size = PAGE_SIZE;
1200                 LOG("buffer_size too small, setting to %d\n", buffer_size);
1201         } else if(buffer_size > 1024*1024) {
1202                 /* arbitrary upper limiit */
1203                 buffer_size = 1024*1024;
1204                 LOG("buffer_size ridiculously large, setting to %d\n",
1205                     buffer_size);
1206         } else {
1207                 buffer_size += PAGE_SIZE-1;
1208                 buffer_size &= ~(PAGE_SIZE-1);
1209         }
1210
1211         if(num_buffers < 1) {
1212                 num_buffers = 1;
1213                 LOG("num_buffers too small, setting to %d\n", num_buffers);
1214         } else if(num_buffers > VIDEO_MAX_FRAME) {
1215                 num_buffers = VIDEO_MAX_FRAME;
1216                 LOG("num_buffers too large, setting to %d\n", num_buffers);
1217         }
1218
1219         if(alternate < USBIF_ISO_1 || alternate > USBIF_ISO_6) {
1220                 alternate = DEFAULT_ALT;
1221                 LOG("alternate specified is invalid, using %d\n", alternate);
1222         }
1223
1224         if (flicker_mode != 0 && flicker_mode != FLICKER_50 && flicker_mode != FLICKER_60) {
1225                 flicker_mode = 0;
1226                 LOG("Flicker mode specified is invalid, using %d\n",
1227                     flicker_mode);
1228         }
1229
1230         DBG("Using %d buffers, each %d bytes, alternate=%d\n",
1231             num_buffers, buffer_size, alternate);
1232 }
1233
1234 /************   Module Stuff ***************/
1235
1236
1237 /******************************************************************************
1238  *
1239  * cpia2_init/module_init
1240  *
1241  *****************************************************************************/
1242 static int __init cpia2_init(void)
1243 {
1244         LOG("%s v%s\n",
1245             ABOUT, CPIA_VERSION);
1246         check_parameters();
1247         cpia2_usb_init();
1248         return 0;
1249 }
1250
1251
1252 /******************************************************************************
1253  *
1254  * cpia2_exit/module_exit
1255  *
1256  *****************************************************************************/
1257 static void __exit cpia2_exit(void)
1258 {
1259         cpia2_usb_cleanup();
1260         schedule_timeout(2 * HZ);
1261 }
1262
1263 module_init(cpia2_init);
1264 module_exit(cpia2_exit);