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 } 580