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->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 } 581