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 V4L2_TUNER_CAP_HWSEEK_BOUNDED | 290 V4L2_TUNER_CAP_HWSEEK_WRAP; 291 tuner->audmode = (stereo_mono_mode ? 292 V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO); 293 294 /* 295 * Actual rssi value lies in between -128 to +127. 296 * Convert this range from 0 to 255 by adding +128 297 */ 298 rssilvl += 128; 299 300 /* 301 * Return signal strength value should be within 0 to 65535. 302 * Find out correct signal radio by multiplying (65535/255) = 257 303 */ 304 tuner->signal = rssilvl * 257; 305 tuner->afc = 0; 306 307 return ret; 308 } 309 310 /* 311 * Set tuner attributes. If current mode is NOT RX, set to RX. 312 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off). 313 * Should we set other tuner attributes, too? 314 */ 315 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv, 316 struct v4l2_tuner *tuner) 317 { 318 struct fmdev *fmdev = video_drvdata(file); 319 u16 aud_mode; 320 u8 rds_mode; 321 int ret; 322 323 if (tuner->index != 0) 324 return -EINVAL; 325 326 aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ? 327 FM_STEREO_MODE : FM_MONO_MODE; 328 rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ? 329 FM_RDS_ENABLE : FM_RDS_DISABLE; 330 331 if (fmdev->curr_fmmode != FM_MODE_RX) { 332 ret = fmc_set_mode(fmdev, FM_MODE_RX); 333 if (ret < 0) { 334 fmerr("Failed to set RX mode\n"); 335 return ret; 336 } 337 } 338 339 ret = fmc_set_stereo_mono(fmdev, aud_mode); 340 if (ret < 0) { 341 fmerr("Failed to set RX stereo/mono mode\n"); 342 return ret; 343 } 344 345 ret = fmc_set_rds_mode(fmdev, rds_mode); 346 if (ret < 0) 347 fmerr("Failed to set RX RDS mode\n"); 348 349 return ret; 350 } 351 352 /* Get tuner or modulator radio frequency */ 353 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv, 354 struct v4l2_frequency *freq) 355 { 356 struct fmdev *fmdev = video_drvdata(file); 357 int ret; 358 359 ret = fmc_get_freq(fmdev, &freq->frequency); 360 if (ret < 0) { 361 fmerr("Failed to get frequency\n"); 362 return ret; 363 } 364 365 /* Frequency unit of 62.5 Hz*/ 366 freq->frequency = (u32) freq->frequency * 16; 367 368 return 0; 369 } 370 371 /* Set tuner or modulator radio frequency */ 372 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv, 373 struct v4l2_frequency *freq) 374 { 375 struct fmdev *fmdev = video_drvdata(file); 376 377 /* 378 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency 379 * in units of 62.5 Hz. 380 */ 381 freq->frequency = (u32)(freq->frequency / 16); 382 383 return fmc_set_freq(fmdev, freq->frequency); 384 } 385 386 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */ 387 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv, 388 struct v4l2_hw_freq_seek *seek) 389 { 390 struct fmdev *fmdev = video_drvdata(file); 391 int ret; 392 393 if (fmdev->curr_fmmode != FM_MODE_RX) { 394 ret = fmc_set_mode(fmdev, FM_MODE_RX); 395 if (ret != 0) { 396 fmerr("Failed to set RX mode\n"); 397 return ret; 398 } 399 } 400 401 ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around, 402 seek->spacing); 403 if (ret < 0) 404 fmerr("RX seek failed - %d\n", ret); 405 406 return ret; 407 } 408 /* Get modulator attributes. If mode is not TX, return no attributes. */ 409 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv, 410 struct v4l2_modulator *mod) 411 { 412 struct fmdev *fmdev = video_drvdata(file); 413 414 if (mod->index != 0) 415 return -EINVAL; 416 417 if (fmdev->curr_fmmode != FM_MODE_TX) 418 return -EPERM; 419 420 mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ? 421 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) | 422 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ? 423 V4L2_TUNER_SUB_RDS : 0); 424 425 mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS | 426 V4L2_TUNER_CAP_LOW; 427 428 return 0; 429 } 430 431 /* Set modulator attributes. If mode is not TX, set to TX. */ 432 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv, 433 struct v4l2_modulator *mod) 434 { 435 struct fmdev *fmdev = video_drvdata(file); 436 u8 rds_mode; 437 u16 aud_mode; 438 int ret; 439 440 if (mod->index != 0) 441 return -EINVAL; 442 443 if (fmdev->curr_fmmode != FM_MODE_TX) { 444 ret = fmc_set_mode(fmdev, FM_MODE_TX); 445 if (ret != 0) { 446 fmerr("Failed to set TX mode\n"); 447 return ret; 448 } 449 } 450 451 aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ? 452 FM_STEREO_MODE : FM_MONO_MODE; 453 rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ? 454 FM_RDS_ENABLE : FM_RDS_DISABLE; 455 ret = fm_tx_set_stereo_mono(fmdev, aud_mode); 456 if (ret < 0) { 457 fmerr("Failed to set mono/stereo mode for TX\n"); 458 return ret; 459 } 460 ret = fm_tx_set_rds_mode(fmdev, rds_mode); 461 if (ret < 0) 462 fmerr("Failed to set rds mode for TX\n"); 463 464 return ret; 465 } 466 467 static const struct v4l2_file_operations fm_drv_fops = { 468 .owner = THIS_MODULE, 469 .read = fm_v4l2_fops_read, 470 .write = fm_v4l2_fops_write, 471 .poll = fm_v4l2_fops_poll, 472 .unlocked_ioctl = video_ioctl2, 473 .open = fm_v4l2_fops_open, 474 .release = fm_v4l2_fops_release, 475 }; 476 477 static const struct v4l2_ctrl_ops fm_ctrl_ops = { 478 .s_ctrl = fm_v4l2_s_ctrl, 479 .g_volatile_ctrl = fm_g_volatile_ctrl, 480 }; 481 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = { 482 .vidioc_querycap = fm_v4l2_vidioc_querycap, 483 .vidioc_g_audio = fm_v4l2_vidioc_g_audio, 484 .vidioc_s_audio = fm_v4l2_vidioc_s_audio, 485 .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner, 486 .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner, 487 .vidioc_g_frequency = fm_v4l2_vidioc_g_freq, 488 .vidioc_s_frequency = fm_v4l2_vidioc_s_freq, 489 .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek, 490 .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator, 491 .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator 492 }; 493 494 /* V4L2 RADIO device parent structure */ 495 static struct video_device fm_viddev_template = { 496 .fops = &fm_drv_fops, 497 .ioctl_ops = &fm_drv_ioctl_ops, 498 .name = FM_DRV_NAME, 499 .release = video_device_release, 500 }; 501 502 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr) 503 { 504 struct v4l2_ctrl *ctrl; 505 int ret; 506 507 /* Init mutex for core locking */ 508 mutex_init(&fmdev->mutex); 509 510 /* Allocate new video device */ 511 gradio_dev = video_device_alloc(); 512 if (NULL == gradio_dev) { 513 fmerr("Can't allocate video device\n"); 514 return -ENOMEM; 515 } 516 517 /* Setup FM driver's V4L2 properties */ 518 memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template)); 519 520 video_set_drvdata(gradio_dev, fmdev); 521 522 gradio_dev->lock = &fmdev->mutex; 523 /* Locking in file operations other than ioctl should be done 524 by the driver, not the V4L2 core. 525 This driver needs auditing so that this flag can be removed. */ 526 set_bit(V4L2_FL_LOCK_ALL_FOPS, &gradio_dev->flags); 527 528 /* Register with V4L2 subsystem as RADIO device */ 529 if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) { 530 video_device_release(gradio_dev); 531 fmerr("Could not register video device\n"); 532 return -ENOMEM; 533 } 534 535 fmdev->radio_dev = gradio_dev; 536 537 /* Register to v4l2 ctrl handler framework */ 538 fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler; 539 540 ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5); 541 if (ret < 0) { 542 fmerr("(fmdev): Can't init ctrl handler\n"); 543 v4l2_ctrl_handler_free(&fmdev->ctrl_handler); 544 return -EBUSY; 545 } 546 547 /* 548 * Following controls are handled by V4L2 control framework. 549 * Added in ascending ID order. 550 */ 551 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, 552 V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN, 553 FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX); 554 555 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, 556 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); 557 558 v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops, 559 V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS, 560 0, V4L2_PREEMPHASIS_75_uS); 561 562 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, 563 V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW, 564 FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH); 565 566 ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, 567 V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0, 568 255, 1, 255); 569 570 if (ctrl) 571 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 572 573 return 0; 574 } 575 576 void *fm_v4l2_deinit_video_device(void) 577 { 578 struct fmdev *fmdev; 579 580 581 fmdev = video_get_drvdata(gradio_dev); 582 583 /* Unregister to v4l2 ctrl handler framework*/ 584 v4l2_ctrl_handler_free(&fmdev->ctrl_handler); 585 586 /* Unregister RADIO device from V4L2 subsystem */ 587 video_unregister_device(gradio_dev); 588 589 return fmdev; 590 } 591