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->capabilities = 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
 206         return 0;
 207 }
 208
 209 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 210 {
 211         struct fmdev *fmdev = container_of(ctrl->handler,
 212                         struct fmdev, ctrl_handler);
 213
 214         switch (ctrl->id) {
 215         case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 216                 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
 217                 break;
 218         default:
 219                 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
 220                 break;
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
 227 {
 228         struct fmdev *fmdev = container_of(ctrl->handler,
 229                         struct fmdev, ctrl_handler);
 230
 231         switch (ctrl->id) {
 232         case V4L2_CID_AUDIO_VOLUME:     /* set volume */
 233                 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
 234
 235         case V4L2_CID_AUDIO_MUTE:       /* set mute */
 236                 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
 237
 238         case V4L2_CID_TUNE_POWER_LEVEL:
 239                 /* set TX power level - ext control */
 240                 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
 241
 242         case V4L2_CID_TUNE_PREEMPHASIS:
 243                 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
 244
 245         default:
 246                 return -EINVAL;
 247         }
 248 }
 249
 250 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
 251                 struct v4l2_audio *audio)
 252 {
 253         memset(audio, 0, sizeof(*audio));
 254         strcpy(audio->name, "Radio");
 255         audio->capability = V4L2_AUDCAP_STEREO;
 256
 257         return 0;
 258 }
 259
 260 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
 261                 const struct v4l2_audio *audio)
 262 {
 263         if (audio->index != 0)
 264                 return -EINVAL;
 265
 266         return 0;
 267 }
 268
 269 /* Get tuner attributes. If current mode is NOT RX, return error */
 270 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
 271                 struct v4l2_tuner *tuner)
 272 {
 273         struct fmdev *fmdev = video_drvdata(file);
 274         u32 bottom_freq;
 275         u32 top_freq;
 276         u16 stereo_mono_mode;
 277         u16 rssilvl;
 278         int ret;
 279
 280         if (tuner->index != 0)
 281                 return -EINVAL;
 282
 283         if (fmdev->curr_fmmode != FM_MODE_RX)
 284                 return -EPERM;
 285
 286         ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
 287         if (ret != 0)
 288                 return ret;
 289
 290         ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
 291         if (ret != 0)
 292                 return ret;
 293
 294         ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
 295         if (ret != 0)
 296                 return ret;
 297
 298         strcpy(tuner->name, "FM");
 299         tuner->type = V4L2_TUNER_RADIO;
 300         /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
 301         tuner->rangelow = bottom_freq * 16;
 302         tuner->rangehigh = top_freq * 16;
 303         tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
 304         ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
 305         tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 306                             V4L2_TUNER_CAP_LOW |
 307                             V4L2_TUNER_CAP_HWSEEK_BOUNDED |
 308                             V4L2_TUNER_CAP_HWSEEK_WRAP;
 309         tuner->audmode = (stereo_mono_mode ?
 310                           V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
 311
 312         /*
 313          * Actual rssi value lies in between -128 to +127.
 314          * Convert this range from 0 to 255 by adding +128
 315          */
 316         rssilvl += 128;
 317
 318         /*
 319          * Return signal strength value should be within 0 to 65535.
 320          * Find out correct signal radio by multiplying (65535/255) = 257
 321          */
 322         tuner->signal = rssilvl * 257;
 323         tuner->afc = 0;
 324
 325         return ret;
 326 }
 327
 328 /*
 329  * Set tuner attributes. If current mode is NOT RX, set to RX.
 330  * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 331  * Should we set other tuner attributes, too?
 332  */
 333 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
 334                 const struct v4l2_tuner *tuner)
 335 {
 336         struct fmdev *fmdev = video_drvdata(file);
 337         u16 aud_mode;
 338         u8 rds_mode;
 339         int ret;
 340
 341         if (tuner->index != 0)
 342                 return -EINVAL;
 343
 344         aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
 345                         FM_STEREO_MODE : FM_MONO_MODE;
 346         rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
 347                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 348
 349         if (fmdev->curr_fmmode != FM_MODE_RX) {
 350                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 351                 if (ret < 0) {
 352                         fmerr("Failed to set RX mode\n");
 353                         return ret;
 354                 }
 355         }
 356
 357         ret = fmc_set_stereo_mono(fmdev, aud_mode);
 358         if (ret < 0) {
 359                 fmerr("Failed to set RX stereo/mono mode\n");
 360                 return ret;
 361         }
 362
 363         ret = fmc_set_rds_mode(fmdev, rds_mode);
 364         if (ret < 0)
 365                 fmerr("Failed to set RX RDS mode\n");
 366
 367         return ret;
 368 }
 369
 370 /* Get tuner or modulator radio frequency */
 371 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
 372                 struct v4l2_frequency *freq)
 373 {
 374         struct fmdev *fmdev = video_drvdata(file);
 375         int ret;
 376
 377         ret = fmc_get_freq(fmdev, &freq->frequency);
 378         if (ret < 0) {
 379                 fmerr("Failed to get frequency\n");
 380                 return ret;
 381         }
 382
 383         /* Frequency unit of 62.5 Hz*/
 384         freq->frequency = (u32) freq->frequency * 16;
 385
 386         return 0;
 387 }
 388
 389 /* Set tuner or modulator radio frequency */
 390 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
 391                 const struct v4l2_frequency *freq)
 392 {
 393         struct fmdev *fmdev = video_drvdata(file);
 394
 395         /*
 396          * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
 397          * in units of 62.5 Hz.
 398          */
 399         return fmc_set_freq(fmdev, freq->frequency / 16);
 400 }
 401
 402 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
 403 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 404                 const struct v4l2_hw_freq_seek *seek)
 405 {
 406         struct fmdev *fmdev = video_drvdata(file);
 407         int ret;
 408
 409         if (file->f_flags & O_NONBLOCK)
 410                 return -EWOULDBLOCK;
 411
 412         if (fmdev->curr_fmmode != FM_MODE_RX) {
 413                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 414                 if (ret != 0) {
 415                         fmerr("Failed to set RX mode\n");
 416                         return ret;
 417                 }
 418         }
 419
 420         ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
 421                         seek->spacing);
 422         if (ret < 0)
 423                 fmerr("RX seek failed - %d\n", ret);
 424
 425         return ret;
 426 }
 427 /* Get modulator attributes. If mode is not TX, return no attributes. */
 428 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
 429                 struct v4l2_modulator *mod)
 430 {
 431         struct fmdev *fmdev = video_drvdata(file);
 432
 433         if (mod->index != 0)
 434                 return -EINVAL;
 435
 436         if (fmdev->curr_fmmode != FM_MODE_TX)
 437                 return -EPERM;
 438
 439         mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
 440                                 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
 441                                 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
 442                                 V4L2_TUNER_SUB_RDS : 0);
 443
 444         mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 445                                 V4L2_TUNER_CAP_LOW;
 446
 447         return 0;
 448 }
 449
 450 /* Set modulator attributes. If mode is not TX, set to TX. */
 451 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
 452                 const struct v4l2_modulator *mod)
 453 {
 454         struct fmdev *fmdev = video_drvdata(file);
 455         u8 rds_mode;
 456         u16 aud_mode;
 457         int ret;
 458
 459         if (mod->index != 0)
 460                 return -EINVAL;
 461
 462         if (fmdev->curr_fmmode != FM_MODE_TX) {
 463                 ret = fmc_set_mode(fmdev, FM_MODE_TX);
 464                 if (ret != 0) {
 465                         fmerr("Failed to set TX mode\n");
 466                         return ret;
 467                 }
 468         }
 469
 470         aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
 471                         FM_STEREO_MODE : FM_MONO_MODE;
 472         rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
 473                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 474         ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
 475         if (ret < 0) {
 476                 fmerr("Failed to set mono/stereo mode for TX\n");
 477                 return ret;
 478         }
 479         ret = fm_tx_set_rds_mode(fmdev, rds_mode);
 480         if (ret < 0)
 481                 fmerr("Failed to set rds mode for TX\n");
 482
 483         return ret;
 484 }
 485
 486 static const struct v4l2_file_operations fm_drv_fops = {
 487         .owner = THIS_MODULE,
 488         .read = fm_v4l2_fops_read,
 489         .write = fm_v4l2_fops_write,
 490         .poll = fm_v4l2_fops_poll,
 491         .unlocked_ioctl = video_ioctl2,
 492         .open = fm_v4l2_fops_open,
 493         .release = fm_v4l2_fops_release,
 494 };
 495
 496 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
 497         .s_ctrl = fm_v4l2_s_ctrl,
 498         .g_volatile_ctrl = fm_g_volatile_ctrl,
 499 };
 500 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
 501         .vidioc_querycap = fm_v4l2_vidioc_querycap,
 502         .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
 503         .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
 504         .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
 505         .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
 506         .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
 507         .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
 508         .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
 509         .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
 510         .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
 511 };
 512
 513 /* V4L2 RADIO device parent structure */
 514 static struct video_device fm_viddev_template = {
 515         .fops = &fm_drv_fops,
 516         .ioctl_ops = &fm_drv_ioctl_ops,
 517         .name = FM_DRV_NAME,
 518         .release = video_device_release,
 519         /*
 520          * To ensure both the tuner and modulator ioctls are accessible we
 521          * set the vfl_dir to M2M to indicate this.
 522          *
 523          * It is not really a mem2mem device of course, but it can both receive
 524          * and transmit using the same radio device. It's the only radio driver
 525          * that does this and it should really be split in two radio devices,
 526          * but that would affect applications using this driver.
 527          */
 528         .vfl_dir = VFL_DIR_M2M,
 529 };
 530
 531 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
 532 {
 533         struct v4l2_ctrl *ctrl;
 534         int ret;
 535
 536         strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name));
 537         ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
 538         if (ret < 0)
 539                 return ret;
 540
 541         /* Init mutex for core locking */
 542         mutex_init(&fmdev->mutex);
 543
 544         /* Allocate new video device */
 545         gradio_dev = video_device_alloc();
 546         if (NULL == gradio_dev) {
 547                 fmerr("Can't allocate video device\n");
 548                 return -ENOMEM;
 549         }
 550
 551         /* Setup FM driver's V4L2 properties */
 552         memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template));
 553
 554         video_set_drvdata(gradio_dev, fmdev);
 555
 556         gradio_dev->lock = &fmdev->mutex;
 557         gradio_dev->v4l2_dev = &fmdev->v4l2_dev;
 558
 559         /* Register with V4L2 subsystem as RADIO device */
 560         if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
 561                 video_device_release(gradio_dev);
 562                 fmerr("Could not register video device\n");
 563                 return -ENOMEM;
 564         }
 565
 566         fmdev->radio_dev = gradio_dev;
 567
 568         /* Register to v4l2 ctrl handler framework */
 569         fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
 570
 571         ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
 572         if (ret < 0) {
 573                 fmerr("(fmdev): Can't init ctrl handler\n");
 574                 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 575                 return -EBUSY;
 576         }
 577
 578         /*
 579          * Following controls are handled by V4L2 control framework.
 580          * Added in ascending ID order.
 581          */
 582         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 583                         V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
 584                         FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
 585
 586         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 587                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 588
 589         v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
 590                         V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
 591                         0, V4L2_PREEMPHASIS_75_uS);
 592
 593         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 594                         V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
 595                         FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
 596
 597         ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 598                         V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
 599                         255, 1, 255);
 600
 601         if (ctrl)
 602                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 603
 604         return 0;
 605 }
 606
 607 void *fm_v4l2_deinit_video_device(void)
 608 {
 609         struct fmdev *fmdev;
 610
 611
 612         fmdev = video_get_drvdata(gradio_dev);
 613
 614         /* Unregister to v4l2 ctrl handler framework*/
 615         v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 616
 617         /* Unregister RADIO device from V4L2 subsystem */
 618         video_unregister_device(gradio_dev);
 619
 620         v4l2_device_unregister(&fmdev->v4l2_dev);
 621
 622         return fmdev;
 623 }