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