2 * FM Driver for Connectivity chip of Texas Instruments.
3 * This file provides interfaces to V4L2 subsystem.
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.
9 * 1) File operation related API (open, close, read, write, poll...etc).
10 * 2) Set of V4L2 IOCTL complaint API.
12 * Copyright (C) 2011 Texas Instruments
13 * Author: Raja Mani <raja_mani@ti.com>
14 * Author: Manjunatha Halli <manjunatha_halli@ti.com>
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.
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.
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
32 #include "fmdrv_v4l2.h"
33 #include "fmdrv_common.h"
37 static struct video_device *gradio_dev;
38 static u8 radio_disconnected;
40 /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
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)
50 fmdev = video_drvdata(file);
52 if (!radio_disconnected) {
53 fmerr("FM device is already disconnected\n");
57 /* Turn on RDS mode , if it is disabled */
58 ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
60 fmerr("Unable to read current rds mode\n");
64 if (rds_mode == FM_RDS_DISABLE) {
65 ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
67 fmerr("Failed to enable rds mode\n");
72 /* Copy RDS data from internal buffer to user buffer */
73 return fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
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)
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);
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);
95 static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
100 fmdev = video_drvdata(file);
101 ret = fmc_is_rds_data_available(fmdev, file, pts);
103 return POLLIN | POLLRDNORM;
109 * Handle open request for "/dev/radioX" device.
110 * Start with FM RX mode as default.
112 static int fm_v4l2_fops_open(struct file *file)
115 struct fmdev *fmdev = NULL;
117 /* Don't allow multiple open */
118 if (radio_disconnected) {
119 fmerr("FM device is already opened\n");
123 fmdev = video_drvdata(file);
125 ret = fmc_prepare(fmdev);
127 fmerr("Unable to prepare FM CORE\n");
131 fmdbg("Load FM RX firmware..\n");
133 ret = fmc_set_mode(fmdev, FM_MODE_RX);
135 fmerr("Unable to load FM RX firmware\n");
138 radio_disconnected = 1;
143 static int fm_v4l2_fops_release(struct file *file)
148 fmdev = video_drvdata(file);
149 if (!radio_disconnected) {
150 fmdbg("FM device is already closed\n");
154 ret = fmc_set_mode(fmdev, FM_MODE_OFF);
156 fmerr("Unable to turn off the chip\n");
160 ret = fmc_release(fmdev);
162 fmerr("FM CORE release failed\n");
165 radio_disconnected = 0;
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)
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;
186 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
188 struct fmdev *fmdev = container_of(ctrl->handler,
189 struct fmdev, ctrl_handler);
192 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
193 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
196 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
203 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
205 struct fmdev *fmdev = container_of(ctrl->handler,
206 struct fmdev, ctrl_handler);
209 case V4L2_CID_AUDIO_VOLUME: /* set volume */
210 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
212 case V4L2_CID_AUDIO_MUTE: /* set mute */
213 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
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);
219 case V4L2_CID_TUNE_PREEMPHASIS:
220 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
227 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
228 struct v4l2_audio *audio)
230 memset(audio, 0, sizeof(*audio));
231 strcpy(audio->name, "Radio");
232 audio->capability = V4L2_AUDCAP_STEREO;
237 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
238 struct v4l2_audio *audio)
240 if (audio->index != 0)
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)
250 struct fmdev *fmdev = video_drvdata(file);
253 u16 stereo_mono_mode;
257 if (tuner->index != 0)
260 if (fmdev->curr_fmmode != FM_MODE_RX)
263 ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
267 ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
271 ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
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 |
284 tuner->audmode = (stereo_mono_mode ?
285 V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
288 * Actual rssi value lies in between -128 to +127.
289 * Convert this range from 0 to 255 by adding +128
294 * Return signal strength value should be within 0 to 65535.
295 * Find out correct signal radio by multiplying (65535/255) = 257
297 tuner->signal = rssilvl * 257;
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?
308 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
309 struct v4l2_tuner *tuner)
311 struct fmdev *fmdev = video_drvdata(file);
316 if (tuner->index != 0)
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;
324 if (fmdev->curr_fmmode != FM_MODE_RX) {
325 ret = fmc_set_mode(fmdev, FM_MODE_RX);
327 fmerr("Failed to set RX mode\n");
332 ret = fmc_set_stereo_mono(fmdev, aud_mode);
334 fmerr("Failed to set RX stereo/mono mode\n");
338 ret = fmc_set_rds_mode(fmdev, rds_mode);
340 fmerr("Failed to set RX RDS mode\n");
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)
349 struct fmdev *fmdev = video_drvdata(file);
352 ret = fmc_get_freq(fmdev, &freq->frequency);
354 fmerr("Failed to get frequency\n");
358 /* Frequency unit of 62.5 Hz*/
359 freq->frequency = (u32) freq->frequency * 16;
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)
368 struct fmdev *fmdev = video_drvdata(file);
371 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
372 * in units of 62.5 Hz.
374 freq->frequency = (u32)(freq->frequency / 16);
376 return fmc_set_freq(fmdev, freq->frequency);
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)
383 struct fmdev *fmdev = video_drvdata(file);
386 if (fmdev->curr_fmmode != FM_MODE_RX) {
387 ret = fmc_set_mode(fmdev, FM_MODE_RX);
389 fmerr("Failed to set RX mode\n");
394 ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
397 fmerr("RX seek failed - %d\n", ret);
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)
405 struct fmdev *fmdev = video_drvdata(file);;
410 if (fmdev->curr_fmmode != FM_MODE_TX)
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);
418 mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
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)
428 struct fmdev *fmdev = video_drvdata(file);
436 if (fmdev->curr_fmmode != FM_MODE_TX) {
437 ret = fmc_set_mode(fmdev, FM_MODE_TX);
439 fmerr("Failed to set TX mode\n");
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);
450 fmerr("Failed to set mono/stereo mode for TX\n");
453 ret = fm_tx_set_rds_mode(fmdev, rds_mode);
455 fmerr("Failed to set rds mode for TX\n");
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,
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,
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
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,
492 .release = video_device_release,
495 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
497 struct v4l2_ctrl *ctrl;
500 /* Init mutex for core locking */
501 mutex_init(&fmdev->mutex);
503 /* Allocate new video device */
504 gradio_dev = video_device_alloc();
505 if (NULL == gradio_dev) {
506 fmerr("Can't allocate video device\n");
510 /* Setup FM driver's V4L2 properties */
511 memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template));
513 video_set_drvdata(gradio_dev, fmdev);
515 gradio_dev->lock = &fmdev->mutex;
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");
524 fmdev->radio_dev = gradio_dev;
526 /* Register to v4l2 ctrl handler framework */
527 fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
529 ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
531 fmerr("(fmdev): Can't init ctrl handler\n");
532 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
537 * Following controls are handled by V4L2 control framework.
538 * Added in ascending ID order.
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);
544 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
545 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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);
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);
555 ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
556 V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
560 ctrl->is_volatile = 1;
565 void *fm_v4l2_deinit_video_device(void)
570 fmdev = video_get_drvdata(gradio_dev);
572 /* Unregister to v4l2 ctrl handler framework*/
573 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
575 /* Unregister RADIO device from V4L2 subsystem */
576 video_unregister_device(gradio_dev);