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