drivers/media/radio/wl128x/fmdrv_v4l2.c

   1 /*
   2  *  FM Driver for Connectivity chip of Texas Instruments.
   3  *  This file provides interfaces to V4L2 subsystem.
   4  *
   5  *  This module registers with V4L2 subsystem as Radio
   6  *  data system interface (/dev/radio). During the registration,
   7  *  it will expose two set of function pointers.
   8  *
   9  *    1) File operation related API (open, close, read, write, poll...etc).
  10  *    2) Set of V4L2 IOCTL complaint API.
  11  *
  12  *  Copyright (C) 2011 Texas Instruments
  13  *  Author: Raja Mani <raja_mani@ti.com>
  14  *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2 as
  18  *  published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  */
  26
  27 #include <linux/export.h>
  28
  29 #include "fmdrv.h"
  30 #include "fmdrv_v4l2.h"
  31 #include "fmdrv_common.h"
  32 #include "fmdrv_rx.h"
  33 #include "fmdrv_tx.h"
  34
  35 static struct video_device gradio_dev;
  36 static u8 radio_disconnected;
  37
  38 /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
  39
  40 /* Read RX RDS data */
  41 static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
  42                                         size_t count, loff_t *ppos)
  43 {
  44         u8 rds_mode;
  45         int ret;
  46         struct fmdev *fmdev;
  47
  48         fmdev = video_drvdata(file);
  49
  50         if (!radio_disconnected) {
  51                 fmerr("FM device is already disconnected\n");
  52                 return -EIO;
  53         }
  54
  55         if (mutex_lock_interruptible(&fmdev->mutex))
  56                 return -ERESTARTSYS;
  57
  58         /* Turn on RDS mode if it is disabled */
  59         ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
  60         if (ret < 0) {
  61                 fmerr("Unable to read current rds mode\n");
  62                 goto read_unlock;
  63         }
  64
  65         if (rds_mode == FM_RDS_DISABLE) {
  66                 ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
  67                 if (ret < 0) {
  68                         fmerr("Failed to enable rds mode\n");
  69                         goto read_unlock;
  70                 }
  71         }
  72
  73         /* Copy RDS data from internal buffer to user buffer */
  74         ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
  75 read_unlock:
  76         mutex_unlock(&fmdev->mutex);
  77         return ret;
  78 }
  79
  80 /* Write TX RDS data */
  81 static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
  82                 size_t count, loff_t *ppos)
  83 {
  84         struct tx_rds rds;
  85         int ret;
  86         struct fmdev *fmdev;
  87
  88         ret = copy_from_user(&rds, buf, sizeof(rds));
  89         rds.text[sizeof(rds.text) - 1] = '\0';
  90         fmdbg("(%d)type: %d, text %s, af %d\n",
  91                    ret, rds.text_type, rds.text, rds.af_freq);
  92         if (ret)
  93                 return -EFAULT;
  94
  95         fmdev = video_drvdata(file);
  96         if (mutex_lock_interruptible(&fmdev->mutex))
  97                 return -ERESTARTSYS;
  98         fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
  99         fm_tx_set_af(fmdev, rds.af_freq);
 100         mutex_unlock(&fmdev->mutex);
 101
 102         return sizeof(rds);
 103 }
 104
 105 static __poll_t fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
 106 {
 107         int ret;
 108         struct fmdev *fmdev;
 109
 110         fmdev = video_drvdata(file);
 111         mutex_lock(&fmdev->mutex);
 112         ret = fmc_is_rds_data_available(fmdev, file, pts);
 113         mutex_unlock(&fmdev->mutex);
 114         if (ret < 0)
 115                 return EPOLLIN | EPOLLRDNORM;
 116
 117         return 0;
 118 }
 119
 120 /*
 121  * Handle open request for "/dev/radioX" device.
 122  * Start with FM RX mode as default.
 123  */
 124 static int fm_v4l2_fops_open(struct file *file)
 125 {
 126         int ret;
 127         struct fmdev *fmdev = NULL;
 128
 129         /* Don't allow multiple open */
 130         if (radio_disconnected) {
 131                 fmerr("FM device is already opened\n");
 132                 return -EBUSY;
 133         }
 134
 135         fmdev = video_drvdata(file);
 136
 137         if (mutex_lock_interruptible(&fmdev->mutex))
 138                 return -ERESTARTSYS;
 139         ret = fmc_prepare(fmdev);
 140         if (ret < 0) {
 141                 fmerr("Unable to prepare FM CORE\n");
 142                 goto open_unlock;
 143         }
 144
 145         fmdbg("Load FM RX firmware..\n");
 146
 147         ret = fmc_set_mode(fmdev, FM_MODE_RX);
 148         if (ret < 0) {
 149                 fmerr("Unable to load FM RX firmware\n");
 150                 goto open_unlock;
 151         }
 152         radio_disconnected = 1;
 153
 154 open_unlock:
 155         mutex_unlock(&fmdev->mutex);
 156         return ret;
 157 }
 158
 159 static int fm_v4l2_fops_release(struct file *file)
 160 {
 161         int ret;
 162         struct fmdev *fmdev;
 163
 164         fmdev = video_drvdata(file);
 165         if (!radio_disconnected) {
 166                 fmdbg("FM device is already closed\n");
 167                 return 0;
 168         }
 169
 170         mutex_lock(&fmdev->mutex);
 171         ret = fmc_set_mode(fmdev, FM_MODE_OFF);
 172         if (ret < 0) {
 173                 fmerr("Unable to turn off the chip\n");
 174                 goto release_unlock;
 175         }
 176
 177         ret = fmc_release(fmdev);
 178         if (ret < 0) {
 179                 fmerr("FM CORE release failed\n");
 180                 goto release_unlock;
 181         }
 182         radio_disconnected = 0;
 183
 184 release_unlock:
 185         mutex_unlock(&fmdev->mutex);
 186         return ret;
 187 }
 188
 189 /* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
 190 static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
 191                 struct v4l2_capability *capability)
 192 {
 193         strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
 194         strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME,
 195                         sizeof(capability->card));
 196         sprintf(capability->bus_info, "UART");
 197         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
 198                 V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
 199                 V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
 200                 V4L2_CAP_RDS_CAPTURE;
 201         capability->capabilities = capability->device_caps |
 202                 V4L2_CAP_DEVICE_CAPS;
 203
 204         return 0;
 205 }
 206
 207 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 208 {
 209         struct fmdev *fmdev = container_of(ctrl->handler,
 210                         struct fmdev, ctrl_handler);
 211
 212         switch (ctrl->id) {
 213         case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 214                 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
 215                 break;
 216         default:
 217                 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
 218                 break;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
 225 {
 226         struct fmdev *fmdev = container_of(ctrl->handler,
 227                         struct fmdev, ctrl_handler);
 228
 229         switch (ctrl->id) {
 230         case V4L2_CID_AUDIO_VOLUME:     /* set volume */
 231                 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
 232
 233         case V4L2_CID_AUDIO_MUTE:       /* set mute */
 234                 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
 235
 236         case V4L2_CID_TUNE_POWER_LEVEL:
 237                 /* set TX power level - ext control */
 238                 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
 239
 240         case V4L2_CID_TUNE_PREEMPHASIS:
 241                 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
 242
 243         default:
 244                 return -EINVAL;
 245         }
 246 }
 247
 248 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
 249                 struct v4l2_audio *audio)
 250 {
 251         memset(audio, 0, sizeof(*audio));
 252         strcpy(audio->name, "Radio");
 253         audio->capability = V4L2_AUDCAP_STEREO;
 254
 255         return 0;
 256 }
 257
 258 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
 259                 const struct v4l2_audio *audio)
 260 {
 261         if (audio->index != 0)
 262                 return -EINVAL;
 263
 264         return 0;
 265 }
 266
 267 /* Get tuner attributes. If current mode is NOT RX, return error */
 268 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
 269                 struct v4l2_tuner *tuner)
 270 {
 271         struct fmdev *fmdev = video_drvdata(file);
 272         u32 bottom_freq;
 273         u32 top_freq;
 274         u16 stereo_mono_mode;
 275         u16 rssilvl;
 276         int ret;
 277
 278         if (tuner->index != 0)
 279                 return -EINVAL;
 280
 281         if (fmdev->curr_fmmode != FM_MODE_RX)
 282                 return -EPERM;
 283
 284         ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
 285         if (ret != 0)
 286                 return ret;
 287
 288         ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
 289         if (ret != 0)
 290                 return ret;
 291
 292         ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
 293         if (ret != 0)
 294                 return ret;
 295
 296         strcpy(tuner->name, "FM");
 297         tuner->type = V4L2_TUNER_RADIO;
 298         /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
 299         tuner->rangelow = bottom_freq * 16;
 300         tuner->rangehigh = top_freq * 16;
 301         tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
 302         ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
 303         tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 304                             V4L2_TUNER_CAP_LOW |
 305                             V4L2_TUNER_CAP_HWSEEK_BOUNDED |
 306                             V4L2_TUNER_CAP_HWSEEK_WRAP;
 307         tuner->audmode = (stereo_mono_mode ?
 308                           V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
 309
 310         /*
 311          * Actual rssi value lies in between -128 to +127.
 312          * Convert this range from 0 to 255 by adding +128
 313          */
 314         rssilvl += 128;
 315
 316         /*
 317          * Return signal strength value should be within 0 to 65535.
 318          * Find out correct signal radio by multiplying (65535/255) = 257
 319          */
 320         tuner->signal = rssilvl * 257;
 321         tuner->afc = 0;
 322
 323         return ret;
 324 }
 325
 326 /*
 327  * Set tuner attributes. If current mode is NOT RX, set to RX.
 328  * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 329  * Should we set other tuner attributes, too?
 330  */
 331 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
 332                 const struct v4l2_tuner *tuner)
 333 {
 334         struct fmdev *fmdev = video_drvdata(file);
 335         u16 aud_mode;
 336         u8 rds_mode;
 337         int ret;
 338
 339         if (tuner->index != 0)
 340                 return -EINVAL;
 341
 342         aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
 343                         FM_STEREO_MODE : FM_MONO_MODE;
 344         rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
 345                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 346
 347         if (fmdev->curr_fmmode != FM_MODE_RX) {
 348                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 349                 if (ret < 0) {
 350                         fmerr("Failed to set RX mode\n");
 351                         return ret;
 352                 }
 353         }
 354
 355         ret = fmc_set_stereo_mono(fmdev, aud_mode);
 356         if (ret < 0) {
 357                 fmerr("Failed to set RX stereo/mono mode\n");
 358                 return ret;
 359         }
 360
 361         ret = fmc_set_rds_mode(fmdev, rds_mode);
 362         if (ret < 0)
 363                 fmerr("Failed to set RX RDS mode\n");
 364
 365         return ret;
 366 }
 367
 368 /* Get tuner or modulator radio frequency */
 369 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
 370                 struct v4l2_frequency *freq)
 371 {
 372         struct fmdev *fmdev = video_drvdata(file);
 373         int ret;
 374
 375         ret = fmc_get_freq(fmdev, &freq->frequency);
 376         if (ret < 0) {
 377                 fmerr("Failed to get frequency\n");
 378                 return ret;
 379         }
 380
 381         /* Frequency unit of 62.5 Hz*/
 382         freq->frequency = (u32) freq->frequency * 16;
 383
 384         return 0;
 385 }
 386
 387 /* Set tuner or modulator radio frequency */
 388 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
 389                 const struct v4l2_frequency *freq)
 390 {
 391         struct fmdev *fmdev = video_drvdata(file);
 392
 393         /*
 394          * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
 395          * in units of 62.5 Hz.
 396          */
 397         return fmc_set_freq(fmdev, freq->frequency / 16);
 398 }
 399
 400 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
 401 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 402                 const struct v4l2_hw_freq_seek *seek)
 403 {
 404         struct fmdev *fmdev = video_drvdata(file);
 405         int ret;
 406
 407         if (file->f_flags & O_NONBLOCK)
 408                 return -EWOULDBLOCK;
 409
 410         if (fmdev->curr_fmmode != FM_MODE_RX) {
 411                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 412                 if (ret != 0) {
 413                         fmerr("Failed to set RX mode\n");
 414                         return ret;
 415                 }
 416         }
 417
 418         ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
 419                         seek->spacing);
 420         if (ret < 0)
 421                 fmerr("RX seek failed - %d\n", ret);
 422
 423         return ret;
 424 }
 425 /* Get modulator attributes. If mode is not TX, return no attributes. */
 426 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
 427                 struct v4l2_modulator *mod)
 428 {
 429         struct fmdev *fmdev = video_drvdata(file);
 430
 431         if (mod->index != 0)
 432                 return -EINVAL;
 433
 434         if (fmdev->curr_fmmode != FM_MODE_TX)
 435                 return -EPERM;
 436
 437         mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
 438                                 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
 439                                 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
 440                                 V4L2_TUNER_SUB_RDS : 0);
 441
 442         mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 443                                 V4L2_TUNER_CAP_LOW;
 444
 445         return 0;
 446 }
 447
 448 /* Set modulator attributes. If mode is not TX, set to TX. */
 449 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
 450                 const struct v4l2_modulator *mod)
 451 {
 452         struct fmdev *fmdev = video_drvdata(file);
 453         u8 rds_mode;
 454         u16 aud_mode;
 455         int ret;
 456
 457         if (mod->index != 0)
 458                 return -EINVAL;
 459
 460         if (fmdev->curr_fmmode != FM_MODE_TX) {
 461                 ret = fmc_set_mode(fmdev, FM_MODE_TX);
 462                 if (ret != 0) {
 463                         fmerr("Failed to set TX mode\n");
 464                         return ret;
 465                 }
 466         }
 467
 468         aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
 469                         FM_STEREO_MODE : FM_MONO_MODE;
 470         rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
 471                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 472         ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
 473         if (ret < 0) {
 474                 fmerr("Failed to set mono/stereo mode for TX\n");
 475                 return ret;
 476         }
 477         ret = fm_tx_set_rds_mode(fmdev, rds_mode);
 478         if (ret < 0)
 479                 fmerr("Failed to set rds mode for TX\n");
 480
 481         return ret;
 482 }
 483
 484 static const struct v4l2_file_operations fm_drv_fops = {
 485         .owner = THIS_MODULE,
 486         .read = fm_v4l2_fops_read,
 487         .write = fm_v4l2_fops_write,
 488         .poll = fm_v4l2_fops_poll,
 489         .unlocked_ioctl = video_ioctl2,
 490         .open = fm_v4l2_fops_open,
 491         .release = fm_v4l2_fops_release,
 492 };
 493
 494 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
 495         .s_ctrl = fm_v4l2_s_ctrl,
 496         .g_volatile_ctrl = fm_g_volatile_ctrl,
 497 };
 498 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
 499         .vidioc_querycap = fm_v4l2_vidioc_querycap,
 500         .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
 501         .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
 502         .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
 503         .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
 504         .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
 505         .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
 506         .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
 507         .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
 508         .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
 509 };
 510
 511 /* V4L2 RADIO device parent structure */
 512 static const struct video_device fm_viddev_template = {
 513         .fops = &fm_drv_fops,
 514         .ioctl_ops = &fm_drv_ioctl_ops,
 515         .name = FM_DRV_NAME,
 516         .release = video_device_release_empty,
 517         /*
 518          * To ensure both the tuner and modulator ioctls are accessible we
 519          * set the vfl_dir to M2M to indicate this.
 520          *
 521          * It is not really a mem2mem device of course, but it can both receive
 522          * and transmit using the same radio device. It's the only radio driver
 523          * that does this and it should really be split in two radio devices,
 524          * but that would affect applications using this driver.
 525          */
 526         .vfl_dir = VFL_DIR_M2M,
 527 };
 528
 529 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
 530 {
 531         struct v4l2_ctrl *ctrl;
 532         int ret;
 533
 534         strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name));
 535         ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
 536         if (ret < 0)
 537                 return ret;
 538
 539         /* Init mutex for core locking */
 540         mutex_init(&fmdev->mutex);
 541
 542         /* Setup FM driver's V4L2 properties */
 543         gradio_dev = fm_viddev_template;
 544
 545         video_set_drvdata(&gradio_dev, fmdev);
 546
 547         gradio_dev.lock = &fmdev->mutex;
 548         gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
 549
 550         /* Register with V4L2 subsystem as RADIO device */
 551         if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
 552                 v4l2_device_unregister(&fmdev->v4l2_dev);
 553                 fmerr("Could not register video device\n");
 554                 return -ENOMEM;
 555         }
 556
 557         fmdev->radio_dev = &gradio_dev;
 558
 559         /* Register to v4l2 ctrl handler framework */
 560         fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
 561
 562         ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
 563         if (ret < 0) {
 564                 fmerr("(fmdev): Can't init ctrl handler\n");
 565                 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 566                 video_unregister_device(fmdev->radio_dev);
 567                 v4l2_device_unregister(&fmdev->v4l2_dev);
 568                 return -EBUSY;
 569         }
 570
 571         /*
 572          * Following controls are handled by V4L2 control framework.
 573          * Added in ascending ID order.
 574          */
 575         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 576                         V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
 577                         FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
 578
 579         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 580                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 581
 582         v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
 583                         V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
 584                         0, V4L2_PREEMPHASIS_75_uS);
 585
 586         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 587                         V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
 588                         FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
 589
 590         ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 591                         V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
 592                         255, 1, 255);
 593
 594         if (ctrl)
 595                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 596
 597         return 0;
 598 }
 599
 600 void *fm_v4l2_deinit_video_device(void)
 601 {
 602         struct fmdev *fmdev;
 603
 604
 605         fmdev = video_get_drvdata(&gradio_dev);
 606
 607         /* Unregister to v4l2 ctrl handler framework*/
 608         v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 609
 610         /* Unregister RADIO device from V4L2 subsystem */
 611         video_unregister_device(&gradio_dev);
 612
 613         v4l2_device_unregister(&fmdev->v4l2_dev);
 614
 615         return fmdev;
 616 }