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->version = FM_DRV_RADIO_VERSION;
 179         capability->capabilities = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
 180                 V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
 181                 V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
 182                 V4L2_CAP_RDS_CAPTURE;
 183
 184         return 0;
 185 }
 186
 187 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 188 {
 189         struct fmdev *fmdev = container_of(ctrl->handler,
 190                         struct fmdev, ctrl_handler);
 191
 192         switch (ctrl->id) {
 193         case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 194                 ctrl->cur.val = fm_tx_get_tune_cap_val(fmdev);
 195                 break;
 196         default:
 197                 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
 198                 break;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
 205 {
 206         struct fmdev *fmdev = container_of(ctrl->handler,
 207                         struct fmdev, ctrl_handler);
 208
 209         switch (ctrl->id) {
 210         case V4L2_CID_AUDIO_VOLUME:     /* set volume */
 211                 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
 212
 213         case V4L2_CID_AUDIO_MUTE:       /* set mute */
 214                 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
 215
 216         case V4L2_CID_TUNE_POWER_LEVEL:
 217                 /* set TX power level - ext control */
 218                 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
 219
 220         case V4L2_CID_TUNE_PREEMPHASIS:
 221                 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
 222
 223         default:
 224                 return -EINVAL;
 225         }
 226 }
 227
 228 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
 229                 struct v4l2_audio *audio)
 230 {
 231         memset(audio, 0, sizeof(*audio));
 232         strcpy(audio->name, "Radio");
 233         audio->capability = V4L2_AUDCAP_STEREO;
 234
 235         return 0;
 236 }
 237
 238 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
 239                 struct v4l2_audio *audio)
 240 {
 241         if (audio->index != 0)
 242                 return -EINVAL;
 243
 244         return 0;
 245 }
 246
 247 /* Get tuner attributes. If current mode is NOT RX, return error */
 248 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
 249                 struct v4l2_tuner *tuner)
 250 {
 251         struct fmdev *fmdev = video_drvdata(file);
 252         u32 bottom_freq;
 253         u32 top_freq;
 254         u16 stereo_mono_mode;
 255         u16 rssilvl;
 256         int ret;
 257
 258         if (tuner->index != 0)
 259                 return -EINVAL;
 260
 261         if (fmdev->curr_fmmode != FM_MODE_RX)
 262                 return -EPERM;
 263
 264         ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
 265         if (ret != 0)
 266                 return ret;
 267
 268         ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
 269         if (ret != 0)
 270                 return ret;
 271
 272         ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
 273         if (ret != 0)
 274                 return ret;
 275
 276         strcpy(tuner->name, "FM");
 277         tuner->type = V4L2_TUNER_RADIO;
 278         /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
 279         tuner->rangelow = bottom_freq * 16;
 280         tuner->rangehigh = top_freq * 16;
 281         tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
 282         ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
 283         tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 284                             V4L2_TUNER_CAP_LOW;
 285         tuner->audmode = (stereo_mono_mode ?
 286                           V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
 287
 288         /*
 289          * Actual rssi value lies in between -128 to +127.
 290          * Convert this range from 0 to 255 by adding +128
 291          */
 292         rssilvl += 128;
 293
 294         /*
 295          * Return signal strength value should be within 0 to 65535.
 296          * Find out correct signal radio by multiplying (65535/255) = 257
 297          */
 298         tuner->signal = rssilvl * 257;
 299         tuner->afc = 0;
 300
 301         return ret;
 302 }
 303
 304 /*
 305  * Set tuner attributes. If current mode is NOT RX, set to RX.
 306  * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 307  * Should we set other tuner attributes, too?
 308  */
 309 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
 310                 struct v4l2_tuner *tuner)
 311 {
 312         struct fmdev *fmdev = video_drvdata(file);
 313         u16 aud_mode;
 314         u8 rds_mode;
 315         int ret;
 316
 317         if (tuner->index != 0)
 318                 return -EINVAL;
 319
 320         aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
 321                         FM_STEREO_MODE : FM_MONO_MODE;
 322         rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
 323                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 324
 325         if (fmdev->curr_fmmode != FM_MODE_RX) {
 326                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 327                 if (ret < 0) {
 328                         fmerr("Failed to set RX mode\n");
 329                         return ret;
 330                 }
 331         }
 332
 333         ret = fmc_set_stereo_mono(fmdev, aud_mode);
 334         if (ret < 0) {
 335                 fmerr("Failed to set RX stereo/mono mode\n");
 336                 return ret;
 337         }
 338
 339         ret = fmc_set_rds_mode(fmdev, rds_mode);
 340         if (ret < 0)
 341                 fmerr("Failed to set RX RDS mode\n");
 342
 343         return ret;
 344 }
 345
 346 /* Get tuner or modulator radio frequency */
 347 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
 348                 struct v4l2_frequency *freq)
 349 {
 350         struct fmdev *fmdev = video_drvdata(file);
 351         int ret;
 352
 353         ret = fmc_get_freq(fmdev, &freq->frequency);
 354         if (ret < 0) {
 355                 fmerr("Failed to get frequency\n");
 356                 return ret;
 357         }
 358
 359         /* Frequency unit of 62.5 Hz*/
 360         freq->frequency = (u32) freq->frequency * 16;
 361
 362         return 0;
 363 }
 364
 365 /* Set tuner or modulator radio frequency */
 366 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
 367                 struct v4l2_frequency *freq)
 368 {
 369         struct fmdev *fmdev = video_drvdata(file);
 370
 371         /*
 372          * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
 373          * in units of 62.5 Hz.
 374          */
 375         freq->frequency = (u32)(freq->frequency / 16);
 376
 377         return fmc_set_freq(fmdev, freq->frequency);
 378 }
 379
 380 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
 381 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 382                 struct v4l2_hw_freq_seek *seek)
 383 {
 384         struct fmdev *fmdev = video_drvdata(file);
 385         int ret;
 386
 387         if (fmdev->curr_fmmode != FM_MODE_RX) {
 388                 ret = fmc_set_mode(fmdev, FM_MODE_RX);
 389                 if (ret != 0) {
 390                         fmerr("Failed to set RX mode\n");
 391                         return ret;
 392                 }
 393         }
 394
 395         ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
 396                         seek->spacing);
 397         if (ret < 0)
 398                 fmerr("RX seek failed - %d\n", ret);
 399
 400         return ret;
 401 }
 402 /* Get modulator attributes. If mode is not TX, return no attributes. */
 403 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
 404                 struct v4l2_modulator *mod)
 405 {
 406         struct fmdev *fmdev = video_drvdata(file);;
 407
 408         if (mod->index != 0)
 409                 return -EINVAL;
 410
 411         if (fmdev->curr_fmmode != FM_MODE_TX)
 412                 return -EPERM;
 413
 414         mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
 415                                 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
 416                                 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
 417                                 V4L2_TUNER_SUB_RDS : 0);
 418
 419         mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 420                                 V4L2_TUNER_CAP_LOW;
 421
 422         return 0;
 423 }
 424
 425 /* Set modulator attributes. If mode is not TX, set to TX. */
 426 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
 427                 struct v4l2_modulator *mod)
 428 {
 429         struct fmdev *fmdev = video_drvdata(file);
 430         u8 rds_mode;
 431         u16 aud_mode;
 432         int ret;
 433
 434         if (mod->index != 0)
 435                 return -EINVAL;
 436
 437         if (fmdev->curr_fmmode != FM_MODE_TX) {
 438                 ret = fmc_set_mode(fmdev, FM_MODE_TX);
 439                 if (ret != 0) {
 440                         fmerr("Failed to set TX mode\n");
 441                         return ret;
 442                 }
 443         }
 444
 445         aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
 446                         FM_STEREO_MODE : FM_MONO_MODE;
 447         rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
 448                         FM_RDS_ENABLE : FM_RDS_DISABLE;
 449         ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
 450         if (ret < 0) {
 451                 fmerr("Failed to set mono/stereo mode for TX\n");
 452                 return ret;
 453         }
 454         ret = fm_tx_set_rds_mode(fmdev, rds_mode);
 455         if (ret < 0)
 456                 fmerr("Failed to set rds mode for TX\n");
 457
 458         return ret;
 459 }
 460
 461 static const struct v4l2_file_operations fm_drv_fops = {
 462         .owner = THIS_MODULE,
 463         .read = fm_v4l2_fops_read,
 464         .write = fm_v4l2_fops_write,
 465         .poll = fm_v4l2_fops_poll,
 466         .unlocked_ioctl = video_ioctl2,
 467         .open = fm_v4l2_fops_open,
 468         .release = fm_v4l2_fops_release,
 469 };
 470
 471 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
 472         .s_ctrl = fm_v4l2_s_ctrl,
 473         .g_volatile_ctrl = fm_g_volatile_ctrl,
 474 };
 475 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
 476         .vidioc_querycap = fm_v4l2_vidioc_querycap,
 477         .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
 478         .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
 479         .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
 480         .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
 481         .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
 482         .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
 483         .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
 484         .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
 485         .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
 486 };
 487
 488 /* V4L2 RADIO device parent structure */
 489 static struct video_device fm_viddev_template = {
 490         .fops = &fm_drv_fops,
 491         .ioctl_ops = &fm_drv_ioctl_ops,
 492         .name = FM_DRV_NAME,
 493         .release = video_device_release,
 494 };
 495
 496 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
 497 {
 498         struct v4l2_ctrl *ctrl;
 499         int ret;
 500
 501         /* Init mutex for core locking */
 502         mutex_init(&fmdev->mutex);
 503
 504         /* Allocate new video device */
 505         gradio_dev = video_device_alloc();
 506         if (NULL == gradio_dev) {
 507                 fmerr("Can't allocate video device\n");
 508                 return -ENOMEM;
 509         }
 510
 511         /* Setup FM driver's V4L2 properties */
 512         memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template));
 513
 514         video_set_drvdata(gradio_dev, fmdev);
 515
 516         gradio_dev->lock = &fmdev->mutex;
 517
 518         /* Register with V4L2 subsystem as RADIO device */
 519         if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
 520                 video_device_release(gradio_dev);
 521                 fmerr("Could not register video device\n");
 522                 return -ENOMEM;
 523         }
 524
 525         fmdev->radio_dev = gradio_dev;
 526
 527         /* Register to v4l2 ctrl handler framework */
 528         fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
 529
 530         ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
 531         if (ret < 0) {
 532                 fmerr("(fmdev): Can't init ctrl handler\n");
 533                 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 534                 return -EBUSY;
 535         }
 536
 537         /*
 538          * Following controls are handled by V4L2 control framework.
 539          * Added in ascending ID order.
 540          */
 541         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 542                         V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
 543                         FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
 544
 545         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 546                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 547
 548         v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
 549                         V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
 550                         0, V4L2_PREEMPHASIS_75_uS);
 551
 552         v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 553                         V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
 554                         FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
 555
 556         ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
 557                         V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
 558                         255, 1, 255);
 559
 560         if (ctrl)
 561                 ctrl->is_volatile = 1;
 562
 563         return 0;
 564 }
 565
 566 void *fm_v4l2_deinit_video_device(void)
 567 {
 568         struct fmdev *fmdev;
 569
 570
 571         fmdev = video_get_drvdata(gradio_dev);
 572
 573         /* Unregister to v4l2 ctrl handler framework*/
 574         v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
 575
 576         /* Unregister RADIO device from V4L2 subsystem */
 577         video_unregister_device(gradio_dev);
 578
 579         return fmdev;
 580 }