[media] drivers:media:radio: wl128x: FM Driver V4L2 sources

/*

 *  FM Driver for Connectivity chip of Texas Instruments.

 *  This file provides interfaces to V4L2 subsystem.

 *

 *  This module registers with V4L2 subsystem as Radio

 *  data system interface (/dev/radio). During the registration,

 *  it will expose two set of function pointers.

 *

 *    1) File operation related API (open, close, read, write, poll...etc).

 *    2) Set of V4L2 IOCTL complaint API.

 *

 *  Copyright (C) 2011 Texas Instruments

 *  Author: Raja Mani <raja_mani@ti.com>

 *  Author: Manjunatha Halli <manjunatha_halli@ti.com>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include "fmdrv.h"

#include "fmdrv_v4l2.h"

#include "fmdrv_common.h"

#include "fmdrv_rx.h"

#include "fmdrv_tx.h"

static struct video_device *gradio_dev;

static u8 radio_disconnected;

/* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */

/* Read RX RDS data */

static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,

					size_t count, loff_t *ppos)

{

	u8 rds_mode;

	int ret;

	struct fmdev *fmdev;

	fmdev = video_drvdata(file);

	if (!radio_disconnected) {

		fmerr("FM device is already disconnected\n");

		return -EIO;

	}

	/* Turn on RDS mode , if it is disabled */

	ret = fm_rx_get_rds_mode(fmdev, &rds_mode);

	if (ret < 0) {

		fmerr("Unable to read current rds mode\n");

		return ret;

	}

	if (rds_mode == FM_RDS_DISABLE) {

		ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);

		if (ret < 0) {

			fmerr("Failed to enable rds mode\n");

			return ret;

		}

	}

	/* Copy RDS data from internal buffer to user buffer */

	return fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);

}

/* Write TX RDS data */

static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,

		size_t count, loff_t *ppos)

{

	struct tx_rds rds;

	int ret;

	struct fmdev *fmdev;

	ret = copy_from_user(&rds, buf, sizeof(rds));

	fmdbg("(%d)type: %d, text %s, af %d\n",

		   ret, rds.text_type, rds.text, rds.af_freq);

	fmdev = video_drvdata(file);

	fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);

	fm_tx_set_af(fmdev, rds.af_freq);

	return 0;

}

static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)

{

	int ret;

	struct fmdev *fmdev;

	fmdev = video_drvdata(file);

	ret = fmc_is_rds_data_available(fmdev, file, pts);

	if (ret < 0)

		return POLLIN | POLLRDNORM;

	return 0;

}

/*

 * Handle open request for "/dev/radioX" device.

 * Start with FM RX mode as default.

 */

static int fm_v4l2_fops_open(struct file *file)

{

	int ret;

	struct fmdev *fmdev = NULL;

	/* Don't allow multiple open */

	if (radio_disconnected) {

		fmerr("FM device is already opened\n");

		return -EBUSY;

	}

	fmdev = video_drvdata(file);

	ret = fmc_prepare(fmdev);

	if (ret < 0) {

		fmerr("Unable to prepare FM CORE\n");

		return ret;

	}

	fmdbg("Load FM RX firmware..\n");

	ret = fmc_set_mode(fmdev, FM_MODE_RX);

	if (ret < 0) {

		fmerr("Unable to load FM RX firmware\n");

		return ret;

	}

	radio_disconnected = 1;

	return ret;

}

static int fm_v4l2_fops_release(struct file *file)

{

	int ret;

	struct fmdev *fmdev;

	fmdev = video_drvdata(file);

	if (!radio_disconnected) {

		fmdbg("FM device is already closed\n");

		return 0;

	}

	ret = fmc_set_mode(fmdev, FM_MODE_OFF);

	if (ret < 0) {

		fmerr("Unable to turn off the chip\n");

		return ret;

	}

	ret = fmc_release(fmdev);

	if (ret < 0) {

		fmerr("FM CORE release failed\n");

		return ret;

	}

	radio_disconnected = 0;

	return ret;

}

/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */

static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,

		struct v4l2_capability *capability)

{

	strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));

	strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME,

			sizeof(capability->card));

	sprintf(capability->bus_info, "UART");

	capability->version = FM_DRV_RADIO_VERSION;

	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |

		V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |

		V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |

		V4L2_CAP_RDS_CAPTURE;

	return 0;

}

static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)

{

	struct fmdev *fmdev = container_of(ctrl->handler,

			struct fmdev, ctrl_handler);

	switch (ctrl->id) {

	case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:

		ctrl->val = fm_tx_get_tune_cap_val(fmdev);

		break;

	default:

		fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);

		break;

	}

	return 0;

}

static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)

{

	struct fmdev *fmdev = container_of(ctrl->handler,

			struct fmdev, ctrl_handler);

	switch (ctrl->id) {

	case V4L2_CID_AUDIO_VOLUME:	/* set volume */

		return fm_rx_set_volume(fmdev, (u16)ctrl->val);

	case V4L2_CID_AUDIO_MUTE:	/* set mute */

		return fmc_set_mute_mode(fmdev, (u8)ctrl->val);

	case V4L2_CID_TUNE_POWER_LEVEL:

		/* set TX power level - ext control */

		return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);

	case V4L2_CID_TUNE_PREEMPHASIS:

		return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);

	default:

		return -EINVAL;

	}

}

static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,

		struct v4l2_audio *audio)

{

	memset(audio, 0, sizeof(*audio));

	strcpy(audio->name, "Radio");

	audio->capability = V4L2_AUDCAP_STEREO;

	return 0;

}

static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,

		struct v4l2_audio *audio)

{

	if (audio->index != 0)

		return -EINVAL;

	return 0;

}

/* Get tuner attributes. If current mode is NOT RX, return error */

static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,

		struct v4l2_tuner *tuner)

{

	struct fmdev *fmdev = video_drvdata(file);

	u32 bottom_freq;

	u32 top_freq;

	u16 stereo_mono_mode;

	u16 rssilvl;

	int ret;

	if (tuner->index != 0)

		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_RX)

		return -EPERM;

	ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);

	if (ret != 0)

		return ret;

	ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);

	if (ret != 0)

		return ret;

	ret = fm_rx_get_rssi_level(fmdev, &rssilvl);

	if (ret != 0)

		return ret;

	strcpy(tuner->name, "FM");

	tuner->type = V4L2_TUNER_RADIO;

	/* Store rangelow and rangehigh freq in unit of 62.5 Hz */

	tuner->rangelow = bottom_freq * 16;

	tuner->rangehigh = top_freq * 16;

	tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |

	((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);

	tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |

			    V4L2_TUNER_CAP_LOW;

	tuner->audmode = (stereo_mono_mode ?

			  V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);

	/*

	 * Actual rssi value lies in between -128 to +127.

	 * Convert this range from 0 to 255 by adding +128

	 */

	rssilvl += 128;

	/*

	 * Return signal strength value should be within 0 to 65535.

	 * Find out correct signal radio by multiplying (65535/255) = 257

	 */

	tuner->signal = rssilvl * 257;

	tuner->afc = 0;

	return ret;

}

/*

 * Set tuner attributes. If current mode is NOT RX, set to RX.

 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).

 * Should we set other tuner attributes, too?

 */

static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,

		struct v4l2_tuner *tuner)

{

	struct fmdev *fmdev = video_drvdata(file);

	u16 aud_mode;

	u8 rds_mode;

	int ret;

	if (tuner->index != 0)

		return -EINVAL;

	aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?

			FM_STEREO_MODE : FM_MONO_MODE;

	rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?

			FM_RDS_ENABLE : FM_RDS_DISABLE;

	if (fmdev->curr_fmmode != FM_MODE_RX) {

		ret = fmc_set_mode(fmdev, FM_MODE_RX);

		if (ret < 0) {

			fmerr("Failed to set RX mode\n");

			return ret;

		}

	}

	ret = fmc_set_stereo_mono(fmdev, aud_mode);

	if (ret < 0) {

		fmerr("Failed to set RX stereo/mono mode\n");

		return ret;

	}

	ret = fmc_set_rds_mode(fmdev, rds_mode);

	if (ret < 0)

		fmerr("Failed to set RX RDS mode\n");

	return ret;

}

/* Get tuner or modulator radio frequency */

static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,

		struct v4l2_frequency *freq)

{

	struct fmdev *fmdev = video_drvdata(file);

	int ret;

	ret = fmc_get_freq(fmdev, &freq->frequency);

	if (ret < 0) {

		fmerr("Failed to get frequency\n");

		return ret;

	}

	/* Frequency unit of 62.5 Hz*/

	freq->frequency = (u32) freq->frequency * 16;

	return 0;

}

/* Set tuner or modulator radio frequency */

static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,

		struct v4l2_frequency *freq)

{

	struct fmdev *fmdev = video_drvdata(file);

	/*

	 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency

	 * in units of 62.5 Hz.

	 */

	freq->frequency = (u32)(freq->frequency / 16);

	return fmc_set_freq(fmdev, freq->frequency);

}

/* Set hardware frequency seek. If current mode is NOT RX, set it RX. */

static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,

		struct v4l2_hw_freq_seek *seek)

{

	struct fmdev *fmdev = video_drvdata(file);

	int ret;

	if (fmdev->curr_fmmode != FM_MODE_RX) {

		ret = fmc_set_mode(fmdev, FM_MODE_RX);

		if (ret != 0) {

			fmerr("Failed to set RX mode\n");

			return ret;

		}

	}

	ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,

			seek->spacing);

	if (ret < 0)

		fmerr("RX seek failed - %d\n", ret);

	return ret;

}

/* Get modulator attributes. If mode is not TX, return no attributes. */

static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,

		struct v4l2_modulator *mod)

{

	struct fmdev *fmdev = video_drvdata(file);;

	if (mod->index != 0)

		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_TX)

		return -EPERM;

	mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?

				V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |

				((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?

				V4L2_TUNER_SUB_RDS : 0);

	mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |

				V4L2_TUNER_CAP_LOW;

	return 0;

}

/* Set modulator attributes. If mode is not TX, set to TX. */

static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,

		struct v4l2_modulator *mod)

{

	struct fmdev *fmdev = video_drvdata(file);

	u8 rds_mode;

	u16 aud_mode;

	int ret;

	if (mod->index != 0)

		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_TX) {

		ret = fmc_set_mode(fmdev, FM_MODE_TX);

		if (ret != 0) {

			fmerr("Failed to set TX mode\n");

			return ret;

		}

	}

	aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?

			FM_STEREO_MODE : FM_MONO_MODE;

	rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?

			FM_RDS_ENABLE : FM_RDS_DISABLE;

	ret = fm_tx_set_stereo_mono(fmdev, aud_mode);

	if (ret < 0) {

		fmerr("Failed to set mono/stereo mode for TX\n");

		return ret;

	}

	ret = fm_tx_set_rds_mode(fmdev, rds_mode);

	if (ret < 0)

		fmerr("Failed to set rds mode for TX\n");

	return ret;

}

static const struct v4l2_file_operations fm_drv_fops = {

	.owner = THIS_MODULE,

	.read = fm_v4l2_fops_read,

	.write = fm_v4l2_fops_write,

	.poll = fm_v4l2_fops_poll,

	.unlocked_ioctl = video_ioctl2,

	.open = fm_v4l2_fops_open,

	.release = fm_v4l2_fops_release,

};

static const struct v4l2_ctrl_ops fm_ctrl_ops = {

	.s_ctrl = fm_v4l2_s_ctrl,

	.g_volatile_ctrl = fm_g_volatile_ctrl,

};

static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {

	.vidioc_querycap = fm_v4l2_vidioc_querycap,

	.vidioc_g_audio = fm_v4l2_vidioc_g_audio,

	.vidioc_s_audio = fm_v4l2_vidioc_s_audio,

	.vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,

	.vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,

	.vidioc_g_frequency = fm_v4l2_vidioc_g_freq,

	.vidioc_s_frequency = fm_v4l2_vidioc_s_freq,

	.vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,

	.vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,

	.vidioc_s_modulator = fm_v4l2_vidioc_s_modulator

};

/* V4L2 RADIO device parent structure */

static struct video_device fm_viddev_template = {

	.fops = &fm_drv_fops,

	.ioctl_ops = &fm_drv_ioctl_ops,

	.name = FM_DRV_NAME,

	.release = video_device_release,

};

int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)

{

	struct v4l2_ctrl *ctrl;

	int ret;

	/* Init mutex for core locking */

	mutex_init(&fmdev->mutex);

	/* Allocate new video device */

	gradio_dev = video_device_alloc();

	if (NULL == gradio_dev) {

		fmerr("Can't allocate video device\n");

		return -ENOMEM;

	}

	/* Setup FM driver's V4L2 properties */

	memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template));

	video_set_drvdata(gradio_dev, fmdev);

	gradio_dev->lock = &fmdev->mutex;

	/* Register with V4L2 subsystem as RADIO device */

	if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {

		video_device_release(gradio_dev);

		fmerr("Could not register video device\n");

		return -ENOMEM;

	}

	fmdev->radio_dev = gradio_dev;

	/* Register to v4l2 ctrl handler framework */

	fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;

	ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);

	if (ret < 0) {

		fmerr("(fmdev): Can't init ctrl handler\n");

		v4l2_ctrl_handler_free(&fmdev->ctrl_handler);

		return -EBUSY;

	}

	/*

	 * Following controls are handled by V4L2 control framework.

	 * Added in ascending ID order.

	 */

	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,

			V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,

			FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);

	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,

			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);

	v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,

			V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,

			0, V4L2_PREEMPHASIS_75_uS);

	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,

			V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,

			FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);

	ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,

			V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,

			255, 1, 255);

	if (ctrl)

		ctrl->is_volatile = 1;

	return 0;

}

void *fm_v4l2_deinit_video_device(void)

{

	struct fmdev *fmdev;

	fmdev = video_get_drvdata(gradio_dev);

	/* Unregister to v4l2 ctrl handler framework*/

	v4l2_ctrl_handler_free(&fmdev->ctrl_handler);

	/* Unregister RADIO device from V4L2 subsystem */

	video_unregister_device(gradio_dev);

	return fmdev;

}

/*

 *  FM Driver for Connectivity chip of Texas Instruments.

 *

 *  FM V4L2 module header.

 *

 *  Copyright (C) 2011 Texas Instruments

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#ifndef _FMDRV_V4L2_H

#define _FMDRV_V4L2_H

#include <media/v4l2-ioctl.h>

#include <media/v4l2-common.h>

#include <media/v4l2-ctrls.h>

int fm_v4l2_init_video_device(struct fmdev *, int);

void *fm_v4l2_deinit_video_device(void);

#endif