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  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28  *
  29  */
  30
  31 #include <linux/export.h>
  32
  33 #include "fmdrv.h"
  34 #include "fmdrv_v4l2.h"
  35 #include "fmdrv_common.h"
  36 #include "fmdrv_rx.h"
  37 #include "fmdrv_tx.h"
  38
  39 static struct video_device gradio_dev;
  40 static u8 radio_disconnected;
  41
  42 /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
  43
  44 /* Read RX RDS data */
  45 static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
  46                                         size_t count, loff_t *ppos)
  47 {
  48         u8 rds_mode;
  49         int ret;
  50         struct fmdev *fmdev;
  51
  52         fmdev = video_drvdata(file);
  53
  54         if (!radio_disconnected) {
  55                 fmerr("FM device is already disconnected\n");
  56                 return -EIO;
  57         }
  58
  59         if (mutex_lock_interruptible(&fmdev->mutex))
  60                 return -ERESTARTSYS;
  61
  62         /* Turn on RDS mode if it is disabled */
  63         ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
  64         if (ret < 0) {
  65                 fmerr("Unable to read current rds mode\n");
  66                 goto read_unlock;
  67         }
  68
  69         if (rds_mode == FM_RDS_DISABLE) {
  70                 ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
  71                 if (ret < 0) {
  72                         fmerr("Failed to enable rds mode\n");
  73                         goto read_unlock;
  74                 }
  75         }
  76
  77         /* Copy RDS data from internal buffer to user buffer */
  78         ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
  79 read_unlock:
  80         mutex_unlock(&fmdev->mutex);
  81         return ret;
  82 }
  83
  84 /* Write TX RDS data */
  85 static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
  86                 size_t count, loff_t *ppos)
  87 {
  88         struct tx_rds rds;
  89         int ret;
  90         struct fmdev *fmdev;
  91
  92         ret = copy_from_user(&rds, buf, sizeof(rds));
  93         rds.text[sizeof(rds.text) - 1] = '\0';
  94         fmdbg("(%d)type: %d, text %s, af %d\n",
  95                    ret, rds.text_type, rds.text, rds.af_freq);
  96         if (ret)
  97                 return -EFAULT;
  98
  99         fmdev = video_drvdata(file);
 100         if (mutex_lock_interruptible(&fmdev->mutex))
 101                 return -ERESTARTSYS;
 102         fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
 103         fm_tx_set_af(fmdev, rds.af_freq);
 104         mutex_unlock(&fmdev->mutex);
 105
 106         return sizeof(rds);
 107 }
 108
 109 static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
 110 {
 111         int ret;
 112         struct fmdev *fmdev;
 113
 114         fmdev = video_drvdata(file);
 115         mutex_lock(&fmdev->mutex);
 116         ret = fmc_is_rds_data_available(fmdev, file, pts);
 117         mutex_unlock(&fmdev->mutex);
 118         if (ret < 0)
 119                 return POLLIN | POLLRDNORM;
 120
 121         return 0;
 122 }
 123
 124 /*
 125  * Handle open request for "/dev/radioX" device.
 126  * Start with FM RX mode as default.
 127  */
 128 static int fm_v4l2_fops_open(struct file *file)
 129 {
 130         int ret;
 131         struct fmdev *fmdev = NULL;
 132
 133         /* Don't allow multiple open */
 134         if (radio_disconnected) {
 135                 fmerr("FM device is already opened\n");
 136                 return -EBUSY;
 137         }
 138
 139         fmdev = video_drvdata(file);
 140
 141         if (mutex_lock_interruptible(&fmdev->mutex))
 142                 return -ERESTARTSYS;
 143         ret = fmc_prepare(fmdev);
 144         if (ret < 0) {
 145                 fmerr("Unable to prepare FM CORE\n");
 146                 goto open_unlock;
 147         }
 148
 149         fmdbg("Load FM RX firmware..\n");
 150
 151         ret = fmc_set_mode(fmdev, FM_MODE_RX);
 152         if (ret < 0) {
 153                 fmerr("Unable to load FM RX firmware\n");
 154                 goto open_unlock;
 155         }
 156         radio_disconnected = 1;
 157
 158 open_unlock:
 159         mutex_unlock(&fmdev->mutex);
 160         return ret;
 161 }
 162
 163 static int fm_v4l2_fops_release(struct file *file)
 164 {
 165         int ret;
 166         struct fmdev *fmdev;
 167
 168         fmdev = video_drvdata(file);
 169         if (!radio_disconnected) {
 170                 fmdbg("FM device is already closed\n");
 171                 return 0;
 172         }
 173
 174         mutex_lock(&fmdev->mutex);
 175         ret = fmc_set_mode(fmdev, FM_MODE_OFF);
 176         if (ret < 0) {
 177                 fmerr("Unable to turn off the chip\n");
 178                 goto release_unlock;
 179         }
 180
 181         ret = fmc_release(fmdev);
 182         if (ret < 0) {
 183                 fmerr("FM CORE release failed\n");
 184                 goto release_unlock;
 185         }
 186         radio_disconnected = 0;
 187
 188 release_unlock:
 189         mutex_unlock(&fmdev->mutex);
 190         return ret;
 191 }
 192
 193 /* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
 194 static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
 195                 struct v4l2_capability *capability)
 196 {
 197         strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
 198         strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME,
 199                         sizeof(capability->card));
 200         sprintf(capability->bus_info, "UART");
 201         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
 202                 V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
 203                 V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
 204                 V4L2_CAP_RDS_CAPTURE;
 205         capability->capabilities = capability->device_caps |
 206                 V4L2_CAP_DEVICE_CAPS;
 207
 208         return 0;
 209 }
 210
 211 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 212 {
 213         struct fmdev *fmdev = container_of(ctrl->handler,
 214                         struct fmdev, ctrl_handler);
 215
 216         switch (ctrl->id) {
 217         case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 218                 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
 219                 break;
 220         default:
 221                 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
 222                 break;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
 229 {
 230         struct fmdev *fmdev = container_of(ctrl->handler,
 231                         struct fmdev, ctrl_handler);
 232
 233         switch (ctrl->id) {
 234         case V4L2_CID_AUDIO_VOLUME:     /* set volume */
 235                 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
 236
 237         case V4L2_CID_AUDIO_MUTE:       /* set mute */
 238                 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
 239
 240         case V4L2_CID_TUNE_POWER_LEVEL:
 241                 /* set TX power level - ext control */
 242                 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
 243
 244         case V4L2_CID_TUNE_PREEMPHASIS:
 245                 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
 246
 247         default:
 248                 return -EINVAL;
 249         }
 250 }
 251
 252 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
 253                 struct v4l2_audio *audio)
 254 {
 255         memset(audio, 0, sizeof(*audio));
 256         strcpy(audio->name, "Radio");
 257         audio->capability = V4L2_AUDCAP_STEREO;
 258
 259         return 0;
 260 }
 261
 262 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
 263                 const struct v4l2_audio *audio)
 264 {
 265         if (audio->index != 0)
 266                 return -EINVAL;
 267
 268         return 0;
 269 }
 270
 271 /* Get tuner attributes. If current mode is NOT RX, return error */
 272 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
 273                 struct v4l2_tuner *tuner)
 274 {
 275         struct fmdev *fmdev = video_drvdata(file);
 276         u32 bottom_freq;
 277         u32 top_freq;
 278         u16 stereo_mono_mode;
 279         u16 rssilvl;
 280         int ret;
 281
 282         if (tuner->index != 0)
 283                 return -EINVAL;
 284
 285         if (fmdev->curr_fmmode != FM_MODE_RX)
 286                 return -EPERM;
 287
 288         ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
 289         if (ret != 0)
 290                 return ret;
 291
 292         ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
 293         if (ret != 0)
 294                 return ret;
 295
 296         ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
 297         if (ret != 0)
 298                 return ret;
 299
 300         strcpy(tuner->name, "FM");
 301         tuner->type = V4L2_TUNER_RADIO;
 302         /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
 303         tuner->rangelow = bottom_freq * 16;
 304         tuner->rangehigh = top_freq * 16;
 305         tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
 306         ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
 307         tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 308                             V4L2_TUNER_CAP_LOW |
 309                             V4L2_TUNER_CAP_HWSEEK_BOUNDED |
 310                             V4L2_TUNER_CAP_HWSEEK_WRAP;
 311         tuner->audmode = (stereo_mono_mode ?
 312                           V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
 313
 314         /*
 315          * Actual rssi value lies in between -128 to +127.
 316          * Convert this range from 0 to 255 by adding +128
 317          */
 318         rssilvl += 128;
 319
 320         /*
 321          * Return signal strength value should be within 0 to 65535.
 322          * Find out correct signal radio by multiplying (65535/255) = 257
 323          */
 324         tuner->signal = rssilvl * 257;
 325         tuner->afc = 0;
 326
 327         return ret;
 328 }
 329
 330 /*
 331  * Set tuner attributes. If current mode is NOT RX, set to RX.
 332  * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 333  * Should we set other tuner attributes, too?
 334  */
 335 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
 336                 const struct v4l2_tuner *tuner)
 337 {
 338         struct fmdev *fmdev = video_drvdata(file);
 339         u16 aud_mode;
 340         u8 rds_mode;
 341         int ret;
 342
 343         if (tuner->index != 0)
 344                 return -EINVAL;
 345
 346         aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
 347                         FM_STEREO_MODE : FM_MONO_MODE;
 348         rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
 349                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 350
 351         if (fmdev->curr_fmmode != FM_MODE_RX) {
 352                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 353                 if (ret < 0) {
 354                         fmerr("Failed to set RX mode\n");
 355                         return ret;
 356                 }
 357         }
 358
 359         ret = fmc_set_stereo_mono(fmdev, aud_mode);
 360         if (ret < 0) {
 361                 fmerr("Failed to set RX stereo/mono mode\n");
 362                 return ret;
 363         }
 364
 365         ret = fmc_set_rds_mode(fmdev, rds_mode);
 366         if (ret < 0)
 367                 fmerr("Failed to set RX RDS mode\n");
 368
 369         return ret;
 370 }
 371
 372 /* Get tuner or modulator radio frequency */
 373 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
 374                 struct v4l2_frequency *freq)
 375 {
 376         struct fmdev *fmdev = video_drvdata(file);
 377         int ret;
 378
 379         ret = fmc_get_freq(fmdev, &freq->frequency);
 380         if (ret < 0) {
 381                 fmerr("Failed to get frequency\n");
 382                 return ret;
 383         }
 384
 385         /* Frequency unit of 62.5 Hz*/
 386         freq->frequency = (u32) freq->frequency * 16;
 387
 388         return 0;
 389 }
 390
 391 /* Set tuner or modulator radio frequency */
 392 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
 393                 const struct v4l2_frequency *freq)
 394 {
 395         struct fmdev *fmdev = video_drvdata(file);
 396
 397         /*
 398          * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
 399          * in units of 62.5 Hz.
 400          */
 401         return fmc_set_freq(fmdev, freq->frequency / 16);
 402 }
 403
 404 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
 405 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 406                 const struct v4l2_hw_freq_seek *seek)
 407 {
 408         struct fmdev *fmdev = video_drvdata(file);
 409         int ret;
 410
 411         if (file->f_flags & O_NONBLOCK)
 412                 return -EWOULDBLOCK;
 413
 414         if (fmdev->curr_fmmode != FM_MODE_RX) {
 415                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 416                 if (ret != 0) {
 417                         fmerr("Failed to set RX mode\n");
 418                         return ret;
 419                 }
 420         }
 421
 422         ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
 423                         seek->spacing);
 424         if (ret < 0)
 425                 fmerr("RX seek failed - %d\n", ret);
 426
 427         return ret;
 428 }
 429 /* Get modulator attributes. If mode is not TX, return no attributes. */
 430 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
 431                 struct v4l2_modulator *mod)
 432 {
 433         struct fmdev *fmdev = video_drvdata(file);
 434
 435         if (mod->index != 0)
 436                 return -EINVAL;
 437
 438         if (fmdev->curr_fmmode != FM_MODE_TX)
 439                 return -EPERM;
 440
 441         mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
 442                                 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
 443                                 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
 444                                 V4L2_TUNER_SUB_RDS : 0);
 445
 446         mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 447                                 V4L2_TUNER_CAP_LOW;
 448
 449         return 0;
 450 }
 451
 452 /* Set modulator attributes. If mode is not TX, set to TX. */
 453 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
 454                 const struct v4l2_modulator *mod)
 455 {
 456         struct fmdev *fmdev = video_drvdata(file);
 457         u8 rds_mode;
 458         u16 aud_mode;
 459         int ret;
 460
 461         if (mod->index != 0)
 462                 return -EINVAL;
 463
 464         if (fmdev->curr_fmmode != FM_MODE_TX) {
 465                 ret = fmc_set_mode(fmdev, FM_MODE_TX);
 466                 if (ret != 0) {
 467                         fmerr("Failed to set TX mode\n");
 468                         return ret;
 469                 }
 470         }
 471
 472         aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
 473                         FM_STEREO_MODE : FM_MONO_MODE;
 474         rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
 475                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 476         ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
 477         if (ret < 0) {
 478                 fmerr("Failed to set mono/stereo mode for TX\n");
 479                 return ret;
 480         }
 481         ret = fm_tx_set_rds_mode(fmdev, rds_mode);
 482         if (ret < 0)
 483                 fmerr("Failed to set rds mode for TX\n");
 484
 485         return ret;
 486 }
 487
 488 static const struct v4l2_file_operations fm_drv_fops = {
 489         .owner = THIS_MODULE,
 490         .read = fm_v4l2_fops_read,
 491         .write = fm_v4l2_fops_write,
 492         .poll = fm_v4l2_fops_poll,
 493         .unlocked_ioctl = video_ioctl2,
 494         .open = fm_v4l2_fops_open,
 495         .release = fm_v4l2_fops_release,
 496 };
 497
 498 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
 499         .s_ctrl = fm_v4l2_s_ctrl,
 500         .g_volatile_ctrl = fm_g_volatile_ctrl,
 501 };
 502 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
 503         .vidioc_querycap = fm_v4l2_vidioc_querycap,
 504         .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
 505         .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
 506         .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
 507         .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
 508         .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
 509         .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
 510         .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
 511         .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
 512         .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
 513 };
 514
 515 /* V4L2 RADIO device parent structure */
 516 static struct video_device fm_viddev_template = {
 517         .fops = &fm_drv_fops,
 518         .ioctl_ops = &fm_drv_ioctl_ops,
 519         .name = FM_DRV_NAME,
 520         .release = video_device_release_empty,
 521         /*
 522          * To ensure both the tuner and modulator ioctls are accessible we
 523          * set the vfl_dir to M2M to indicate this.
 524          *
 525          * It is not really a mem2mem device of course, but it can both receive
 526          * and transmit using the same radio device. It's the only radio driver
 527          * that does this and it should really be split in two radio devices,
 528          * but that would affect applications using this driver.
 529          */
 530         .vfl_dir = VFL_DIR_M2M,
 531 };
 532
 533 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
 534 {
 535         struct v4l2_ctrl *ctrl;
 536         int ret;
 537
 538         strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name));
 539         ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
 540         if (ret < 0)
 541                 return ret;
 542
 543         /* Init mutex for core locking */
 544         mutex_init(&fmdev->mutex);
 545
 546         /* Setup FM driver's V4L2 properties */
 547         gradio_dev = fm_viddev_template;
 548
 549         video_set_drvdata(&gradio_dev, fmdev);
 550
 551         gradio_dev.lock = &fmdev->mutex;
 552         gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
 553
 554         /* Register with V4L2 subsystem as RADIO device */
 555         if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
 556                 fmerr("Could not register video device\n");
 557                 return -ENOMEM;
 558         }
 559
 560         fmdev->radio_dev = &gradio_dev;
 561
 562         /* Register to v4l2 ctrl handler framework */
 563         fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
 564
 565         ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
 566         if (ret < 0) {
 567                 fmerr("(fmdev): Can't init ctrl handler\n");
 568                 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 569                 return -EBUSY;
 570         }
 571
 572         /*
 573          * Following controls are handled by V4L2 control framework.
 574          * Added in ascending ID order.
 575          */
 576         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 577                         V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
 578                         FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
 579
 580         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 581                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 582
 583         v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
 584                         V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
 585                         0, V4L2_PREEMPHASIS_75_uS);
 586
 587         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 588                         V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
 589                         FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
 590
 591         ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 592                         V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
 593                         255, 1, 255);
 594
 595         if (ctrl)
 596                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 597
 598         return 0;
 599 }
 600
 601 void *fm_v4l2_deinit_video_device(void)
 602 {
 603         struct fmdev *fmdev;
 604
 605
 606         fmdev = video_get_drvdata(&gradio_dev);
 607
 608         /* Unregister to v4l2 ctrl handler framework*/
 609         v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 610
 611         /* Unregister RADIO device from V4L2 subsystem */
 612         video_unregister_device(&gradio_dev);
 613
 614         v4l2_device_unregister(&fmdev->v4l2_dev);
 615
 616         return fmdev;
 617 }