[linux-block.git] / drivers / media / radio / wl128x / fmdrv_v4l2.c

/*
 *  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.
 *
 */

#include <linux/export.h>

#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;
	}

	if (mutex_lock_interruptible(&fmdev->mutex))
		return -ERESTARTSYS;

	/* 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");
		goto read_unlock;
	}

	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");
			goto read_unlock;
		}
	}

	/* Copy RDS data from internal buffer to user buffer */
	ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
read_unlock:
	mutex_unlock(&fmdev->mutex);
	return ret;
}

/* 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));
	rds.text[sizeof(rds.text) - 1] = '\0';
	fmdbg("(%d)type: %d, text %s, af %d\n",
		   ret, rds.text_type, rds.text, rds.af_freq);
	if (ret)
		return -EFAULT;

	fmdev = video_drvdata(file);
	if (mutex_lock_interruptible(&fmdev->mutex))
		return -ERESTARTSYS;
	fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
	fm_tx_set_af(fmdev, rds.af_freq);
	mutex_unlock(&fmdev->mutex);

	return sizeof(rds);
}

static __poll_t fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
{
	int ret;
	struct fmdev *fmdev;

	fmdev = video_drvdata(file);
	mutex_lock(&fmdev->mutex);
	ret = fmc_is_rds_data_available(fmdev, file, pts);
	mutex_unlock(&fmdev->mutex);
	if (ret < 0)
		return EPOLLIN | EPOLLRDNORM;

	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);

	if (mutex_lock_interruptible(&fmdev->mutex))
		return -ERESTARTSYS;
	ret = fmc_prepare(fmdev);
	if (ret < 0) {
		fmerr("Unable to prepare FM CORE\n");
		goto open_unlock;
	}

	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");
		goto open_unlock;
	}
	radio_disconnected = 1;

open_unlock:
	mutex_unlock(&fmdev->mutex);
	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;
	}

	mutex_lock(&fmdev->mutex);
	ret = fmc_set_mode(fmdev, FM_MODE_OFF);
	if (ret < 0) {
		fmerr("Unable to turn off the chip\n");
		goto release_unlock;
	}

	ret = fmc_release(fmdev);
	if (ret < 0) {
		fmerr("FM CORE release failed\n");
		goto release_unlock;
	}
	radio_disconnected = 0;

release_unlock:
	mutex_unlock(&fmdev->mutex);
	return ret;
}

/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
		struct v4l2_capability *capability)
{
	strscpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
	strscpy(capability->card, FM_DRV_CARD_SHORT_NAME,
		sizeof(capability->card));
	sprintf(capability->bus_info, "UART");
	capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
		V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
		V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
		V4L2_CAP_RDS_CAPTURE;
	capability->capabilities = capability->device_caps |
		V4L2_CAP_DEVICE_CAPS;

	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));
	strscpy(audio->name, "Radio", sizeof(audio->name));
	audio->capability = V4L2_AUDCAP_STEREO;

	return 0;
}

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

	strscpy(tuner->name, "FM", sizeof(tuner->name));
	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 |
			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
			    V4L2_TUNER_CAP_HWSEEK_WRAP;
	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,
		const 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,
		const 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.
	 */
	return fmc_set_freq(fmdev, freq->frequency / 16);
}

/* 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,
		const struct v4l2_hw_freq_seek *seek)
{
	struct fmdev *fmdev = video_drvdata(file);
	int ret;

	if (file->f_flags & O_NONBLOCK)
		return -EWOULDBLOCK;

	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,
		const 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 const struct video_device fm_viddev_template = {
	.fops = &fm_drv_fops,
	.ioctl_ops = &fm_drv_ioctl_ops,
	.name = FM_DRV_NAME,
	.release = video_device_release_empty,
	/*
	 * To ensure both the tuner and modulator ioctls are accessible we
	 * set the vfl_dir to M2M to indicate this.
	 *
	 * It is not really a mem2mem device of course, but it can both receive
	 * and transmit using the same radio device. It's the only radio driver
	 * that does this and it should really be split in two radio devices,
	 * but that would affect applications using this driver.
	 */
	.vfl_dir = VFL_DIR_M2M,
};

int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
{
	struct v4l2_ctrl *ctrl;
	int ret;

	strscpy(fmdev->v4l2_dev.name, FM_DRV_NAME,
		sizeof(fmdev->v4l2_dev.name));
	ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
	if (ret < 0)
		return ret;

	/* Init mutex for core locking */
	mutex_init(&fmdev->mutex);

	/* Setup FM driver's V4L2 properties */
	gradio_dev = fm_viddev_template;

	video_set_drvdata(&gradio_dev, fmdev);

	gradio_dev.lock = &fmdev->mutex;
	gradio_dev.v4l2_dev = &fmdev->v4l2_dev;

	/* Register with V4L2 subsystem as RADIO device */
	if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
		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->flags |= V4L2_CTRL_FLAG_VOLATILE;

	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);

	v4l2_device_unregister(&fmdev->v4l2_dev);

	return fmdev;
}
Commit	Line	Data
7e388496 MH	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	*
7e388496 MH	25	*/
7e388496 MH	26
35a24636 PG	27	#include <linux/export.h>
35a24636 PG	28
7e388496 MH	29	#include "fmdrv.h"
	30	#include "fmdrv_v4l2.h"
	31	#include "fmdrv_common.h"
	32	#include "fmdrv_rx.h"
	33	#include "fmdrv_tx.h"
	34
cab9bf11	35	static struct video_device gradio_dev;
7e388496 MH	36	static u8 radio_disconnected;
	37
	38	/* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
	39
	40	/* Read RX RDS data */
	41	static ssize_t fm_v4l2_fops_read(struct file file, char __user buf,
	42	size_t count, loff_t *ppos)
	43	{
	44	u8 rds_mode;
	45	int ret;
	46	struct fmdev *fmdev;
	47
	48	fmdev = video_drvdata(file);
	49
	50	if (!radio_disconnected) {
	51	fmerr("FM device is already disconnected\n");
	52	return -EIO;
	53	}
	54
a2e10b5a HV	55	if (mutex_lock_interruptible(&fmdev->mutex))
	56	return -ERESTARTSYS;
	57
	58	/* Turn on RDS mode if it is disabled */
7e388496 MH	59	ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
	60	if (ret < 0) {
	61	fmerr("Unable to read current rds mode\n");
a2e10b5a	62	goto read_unlock;
7e388496 MH	63	}
	64
	65	if (rds_mode == FM_RDS_DISABLE) {
	66	ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
	67	if (ret < 0) {
	68	fmerr("Failed to enable rds mode\n");
a2e10b5a	69	goto read_unlock;
7e388496 MH	70	}
	71	}
	72
	73	/* Copy RDS data from internal buffer to user buffer */
a2e10b5a HV	74	ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
	75	read_unlock:
	76	mutex_unlock(&fmdev->mutex);
	77	return ret;
7e388496 MH	78	}
	79
	80	/* Write TX RDS data */
	81	static ssize_t fm_v4l2_fops_write(struct file file, const char __user buf,
	82	size_t count, loff_t *ppos)
	83	{
	84	struct tx_rds rds;
	85	int ret;
	86	struct fmdev *fmdev;
	87
	88	ret = copy_from_user(&rds, buf, sizeof(rds));
75c1ca36	89	rds.text[sizeof(rds.text) - 1] = '\0';
7e388496 MH	90	fmdbg("(%d)type: %d, text %s, af %d\n",
7e388496 MH	91	ret, rds.text_type, rds.text, rds.af_freq);
eb70ac1b HV	92	if (ret)
eb70ac1b HV	93	return -EFAULT;
7e388496 MH	94
7e388496 MH	95	fmdev = video_drvdata(file);
a2e10b5a HV	96	if (mutex_lock_interruptible(&fmdev->mutex))
a2e10b5a HV	97	return -ERESTARTSYS;
7e388496 MH	98	fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
7e388496 MH	99	fm_tx_set_af(fmdev, rds.af_freq);
a2e10b5a	100	mutex_unlock(&fmdev->mutex);
7e388496	101
eb70ac1b	102	return sizeof(rds);
7e388496 MH	103	}
7e388496 MH	104
c23e0cb8	105	static __poll_t fm_v4l2_fops_poll(struct file file, struct poll_table_struct pts)
7e388496 MH	106	{
	107	int ret;
	108	struct fmdev *fmdev;
	109
	110	fmdev = video_drvdata(file);
a2e10b5a	111	mutex_lock(&fmdev->mutex);
7e388496	112	ret = fmc_is_rds_data_available(fmdev, file, pts);
a2e10b5a	113	mutex_unlock(&fmdev->mutex);
7e388496	114	if (ret < 0)
a9a08845	115	return EPOLLIN \| EPOLLRDNORM;
7e388496 MH	116
	117	return 0;
	118	}
	119
	120	/*
	121	* Handle open request for "/dev/radioX" device.
	122	* Start with FM RX mode as default.
	123	*/
	124	static int fm_v4l2_fops_open(struct file *file)
	125	{
	126	int ret;
	127	struct fmdev *fmdev = NULL;
	128
	129	/* Don't allow multiple open */
	130	if (radio_disconnected) {
	131	fmerr("FM device is already opened\n");
	132	return -EBUSY;
	133	}
	134
	135	fmdev = video_drvdata(file);
	136
a2e10b5a HV	137	if (mutex_lock_interruptible(&fmdev->mutex))
a2e10b5a HV	138	return -ERESTARTSYS;
7e388496 MH	139	ret = fmc_prepare(fmdev);
	140	if (ret < 0) {
	141	fmerr("Unable to prepare FM CORE\n");
a2e10b5a	142	goto open_unlock;
7e388496 MH	143	}
	144
	145	fmdbg("Load FM RX firmware..\n");
	146
	147	ret = fmc_set_mode(fmdev, FM_MODE_RX);
	148	if (ret < 0) {
	149	fmerr("Unable to load FM RX firmware\n");
a2e10b5a	150	goto open_unlock;
7e388496 MH	151	}
	152	radio_disconnected = 1;
	153
a2e10b5a HV	154	open_unlock:
a2e10b5a HV	155	mutex_unlock(&fmdev->mutex);
7e388496 MH	156	return ret;
	157	}
	158
	159	static int fm_v4l2_fops_release(struct file *file)
	160	{
	161	int ret;
	162	struct fmdev *fmdev;
	163
	164	fmdev = video_drvdata(file);
	165	if (!radio_disconnected) {
	166	fmdbg("FM device is already closed\n");
	167	return 0;
	168	}
	169
a2e10b5a	170	mutex_lock(&fmdev->mutex);
7e388496 MH	171	ret = fmc_set_mode(fmdev, FM_MODE_OFF);
	172	if (ret < 0) {
	173	fmerr("Unable to turn off the chip\n");
a2e10b5a	174	goto release_unlock;
7e388496 MH	175	}
	176
	177	ret = fmc_release(fmdev);
	178	if (ret < 0) {
	179	fmerr("FM CORE release failed\n");
a2e10b5a	180	goto release_unlock;
7e388496 MH	181	}
	182	radio_disconnected = 0;
	183
a2e10b5a HV	184	release_unlock:
a2e10b5a HV	185	mutex_unlock(&fmdev->mutex);
7e388496 MH	186	return ret;
	187	}
	188
	189	/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
	190	static int fm_v4l2_vidioc_querycap(struct file file, void priv,
	191	struct v4l2_capability *capability)
	192	{
c0decac1 MCC	193	strscpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
	194	strscpy(capability->card, FM_DRV_CARD_SHORT_NAME,
	195	sizeof(capability->card));
7e388496	196	sprintf(capability->bus_info, "UART");
7027c448	197	capability->device_caps = V4L2_CAP_HW_FREQ_SEEK \| V4L2_CAP_TUNER \|
7e388496 MH	198	V4L2_CAP_RADIO \| V4L2_CAP_MODULATOR \|
	199	V4L2_CAP_AUDIO \| V4L2_CAP_READWRITE \|
	200	V4L2_CAP_RDS_CAPTURE;
7027c448 HV	201	capability->capabilities = capability->device_caps \|
7027c448 HV	202	V4L2_CAP_DEVICE_CAPS;
7e388496 MH	203
	204	return 0;
	205	}
	206
	207	static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
	208	{
	209	struct fmdev *fmdev = container_of(ctrl->handler,
	210	struct fmdev, ctrl_handler);
	211
	212	switch (ctrl->id) {
	213	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
ddac5c10	214	ctrl->val = fm_tx_get_tune_cap_val(fmdev);
7e388496 MH	215	break;
	216	default:
	217	fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
	218	break;
	219	}
	220
	221	return 0;
	222	}
	223
	224	static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
	225	{
	226	struct fmdev *fmdev = container_of(ctrl->handler,
	227	struct fmdev, ctrl_handler);
	228
	229	switch (ctrl->id) {
	230	case V4L2_CID_AUDIO_VOLUME: /* set volume */
	231	return fm_rx_set_volume(fmdev, (u16)ctrl->val);
	232
	233	case V4L2_CID_AUDIO_MUTE: /* set mute */
	234	return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
	235
	236	case V4L2_CID_TUNE_POWER_LEVEL:
	237	/* set TX power level - ext control */
	238	return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
	239
	240	case V4L2_CID_TUNE_PREEMPHASIS:
	241	return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
	242
	243	default:
	244	return -EINVAL;
	245	}
	246	}
	247
	248	static int fm_v4l2_vidioc_g_audio(struct file file, void priv,
	249	struct v4l2_audio *audio)
	250	{
	251	memset(audio, 0, sizeof(*audio));
cc1e6315	252	strscpy(audio->name, "Radio", sizeof(audio->name));
7e388496 MH	253	audio->capability = V4L2_AUDCAP_STEREO;
	254
	255	return 0;
	256	}
	257
	258	static int fm_v4l2_vidioc_s_audio(struct file file, void priv,
0e8025b9	259	const struct v4l2_audio *audio)
7e388496 MH	260	{
	261	if (audio->index != 0)
	262	return -EINVAL;
	263
	264	return 0;
	265	}
	266
	267	/* Get tuner attributes. If current mode is NOT RX, return error */
	268	static int fm_v4l2_vidioc_g_tuner(struct file file, void priv,
	269	struct v4l2_tuner *tuner)
	270	{
	271	struct fmdev *fmdev = video_drvdata(file);
	272	u32 bottom_freq;
	273	u32 top_freq;
	274	u16 stereo_mono_mode;
	275	u16 rssilvl;
	276	int ret;
	277
	278	if (tuner->index != 0)
	279	return -EINVAL;
	280
	281	if (fmdev->curr_fmmode != FM_MODE_RX)
	282	return -EPERM;
	283
	284	ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
	285	if (ret != 0)
	286	return ret;
	287
	288	ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
	289	if (ret != 0)
	290	return ret;
	291
	292	ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
	293	if (ret != 0)
	294	return ret;
	295
cc1e6315	296	strscpy(tuner->name, "FM", sizeof(tuner->name));
7e388496 MH	297	tuner->type = V4L2_TUNER_RADIO;
	298	/* Store rangelow and rangehigh freq in unit of 62.5 Hz */
	299	tuner->rangelow = bottom_freq * 16;
	300	tuner->rangehigh = top_freq * 16;
	301	tuner->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO \|
	302	((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
	303	tuner->capability = V4L2_TUNER_CAP_STEREO \| V4L2_TUNER_CAP_RDS \|
54f6019b HV	304	V4L2_TUNER_CAP_LOW \|
	305	V4L2_TUNER_CAP_HWSEEK_BOUNDED \|
	306	V4L2_TUNER_CAP_HWSEEK_WRAP;
7e388496 MH	307	tuner->audmode = (stereo_mono_mode ?
	308	V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
	309
	310	/*
	311	* Actual rssi value lies in between -128 to +127.
	312	* Convert this range from 0 to 255 by adding +128
	313	*/
	314	rssilvl += 128;
	315
	316	/*
	317	* Return signal strength value should be within 0 to 65535.
	318	* Find out correct signal radio by multiplying (65535/255) = 257
	319	*/
	320	tuner->signal = rssilvl * 257;
	321	tuner->afc = 0;
	322
	323	return ret;
	324	}
	325
	326	/*
	327	* Set tuner attributes. If current mode is NOT RX, set to RX.
	328	* Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
	329	* Should we set other tuner attributes, too?
	330	*/
	331	static int fm_v4l2_vidioc_s_tuner(struct file file, void priv,
2f73c7c5	332	const struct v4l2_tuner *tuner)
7e388496 MH	333	{
	334	struct fmdev *fmdev = video_drvdata(file);
	335	u16 aud_mode;
	336	u8 rds_mode;
	337	int ret;
	338
	339	if (tuner->index != 0)
	340	return -EINVAL;
	341
	342	aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
	343	FM_STEREO_MODE : FM_MONO_MODE;
	344	rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
	345	FM_RDS_ENABLE : FM_RDS_DISABLE;
	346
	347	if (fmdev->curr_fmmode != FM_MODE_RX) {
	348	ret = fmc_set_mode(fmdev, FM_MODE_RX);
	349	if (ret < 0) {
	350	fmerr("Failed to set RX mode\n");
	351	return ret;
	352	}
	353	}
	354
	355	ret = fmc_set_stereo_mono(fmdev, aud_mode);
	356	if (ret < 0) {
	357	fmerr("Failed to set RX stereo/mono mode\n");
	358	return ret;
	359	}
	360
	361	ret = fmc_set_rds_mode(fmdev, rds_mode);
	362	if (ret < 0)
	363	fmerr("Failed to set RX RDS mode\n");
	364
	365	return ret;
	366	}
	367
	368	/* Get tuner or modulator radio frequency */
	369	static int fm_v4l2_vidioc_g_freq(struct file file, void priv,
	370	struct v4l2_frequency *freq)
	371	{
	372	struct fmdev *fmdev = video_drvdata(file);
	373	int ret;
	374
	375	ret = fmc_get_freq(fmdev, &freq->frequency);
	376	if (ret < 0) {
	377	fmerr("Failed to get frequency\n");
	378	return ret;
	379	}
	380
	381	/* Frequency unit of 62.5 Hz*/
	382	freq->frequency = (u32) freq->frequency * 16;
	383
	384	return 0;
	385	}
	386
	387	/* Set tuner or modulator radio frequency */
	388	static int fm_v4l2_vidioc_s_freq(struct file file, void priv,
b530a447	389	const struct v4l2_frequency *freq)
7e388496 MH	390	{
	391	struct fmdev *fmdev = video_drvdata(file);
	392
	393	/*
	394	* As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
	395	* in units of 62.5 Hz.
	396	*/
b530a447	397	return fmc_set_freq(fmdev, freq->frequency / 16);
7e388496 MH	398	}
	399
	400	/* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
	401	static int fm_v4l2_vidioc_s_hw_freq_seek(struct file file, void priv,
ec6f4328	402	const struct v4l2_hw_freq_seek *seek)
7e388496 MH	403	{
	404	struct fmdev *fmdev = video_drvdata(file);
	405	int ret;
	406
617ade61 HV	407	if (file->f_flags & O_NONBLOCK)
	408	return -EWOULDBLOCK;
	409
7e388496 MH	410	if (fmdev->curr_fmmode != FM_MODE_RX) {
	411	ret = fmc_set_mode(fmdev, FM_MODE_RX);
	412	if (ret != 0) {
	413	fmerr("Failed to set RX mode\n");
	414	return ret;
	415	}
	416	}
	417
	418	ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
	419	seek->spacing);
	420	if (ret < 0)
	421	fmerr("RX seek failed - %d\n", ret);
	422
	423	return ret;
	424	}
	425	/* Get modulator attributes. If mode is not TX, return no attributes. */
	426	static int fm_v4l2_vidioc_g_modulator(struct file file, void priv,
	427	struct v4l2_modulator *mod)
	428	{
69932487	429	struct fmdev *fmdev = video_drvdata(file);
7e388496 MH	430
	431	if (mod->index != 0)
	432	return -EINVAL;
	433
	434	if (fmdev->curr_fmmode != FM_MODE_TX)
	435	return -EPERM;
	436
	437	mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
	438	V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) \|
	439	((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
	440	V4L2_TUNER_SUB_RDS : 0);
	441
	442	mod->capability = V4L2_TUNER_CAP_STEREO \| V4L2_TUNER_CAP_RDS \|
	443	V4L2_TUNER_CAP_LOW;
	444
	445	return 0;
	446	}
	447
	448	/* Set modulator attributes. If mode is not TX, set to TX. */
	449	static int fm_v4l2_vidioc_s_modulator(struct file file, void priv,
3f70e1f5	450	const struct v4l2_modulator *mod)
7e388496 MH	451	{
	452	struct fmdev *fmdev = video_drvdata(file);
	453	u8 rds_mode;
	454	u16 aud_mode;
	455	int ret;
	456
	457	if (mod->index != 0)
	458	return -EINVAL;
	459
	460	if (fmdev->curr_fmmode != FM_MODE_TX) {
	461	ret = fmc_set_mode(fmdev, FM_MODE_TX);
	462	if (ret != 0) {
	463	fmerr("Failed to set TX mode\n");
	464	return ret;
	465	}
	466	}
	467
	468	aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
	469	FM_STEREO_MODE : FM_MONO_MODE;
	470	rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
	471	FM_RDS_ENABLE : FM_RDS_DISABLE;
	472	ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
	473	if (ret < 0) {
	474	fmerr("Failed to set mono/stereo mode for TX\n");
	475	return ret;
	476	}
	477	ret = fm_tx_set_rds_mode(fmdev, rds_mode);
	478	if (ret < 0)
	479	fmerr("Failed to set rds mode for TX\n");
	480
	481	return ret;
	482	}
	483
	484	static const struct v4l2_file_operations fm_drv_fops = {
	485	.owner = THIS_MODULE,
	486	.read = fm_v4l2_fops_read,
	487	.write = fm_v4l2_fops_write,
	488	.poll = fm_v4l2_fops_poll,
	489	.unlocked_ioctl = video_ioctl2,
	490	.open = fm_v4l2_fops_open,
	491	.release = fm_v4l2_fops_release,
	492	};
	493
	494	static const struct v4l2_ctrl_ops fm_ctrl_ops = {
	495	.s_ctrl = fm_v4l2_s_ctrl,
	496	.g_volatile_ctrl = fm_g_volatile_ctrl,
	497	};
	498	static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
	499	.vidioc_querycap = fm_v4l2_vidioc_querycap,
	500	.vidioc_g_audio = fm_v4l2_vidioc_g_audio,
	501	.vidioc_s_audio = fm_v4l2_vidioc_s_audio,
	502	.vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
	503	.vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
	504	.vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
	505	.vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
	506	.vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
	507	.vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
	508	.vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
	509	};
	510
	511	/* V4L2 RADIO device parent structure */
96cc6956	512	static const struct video_device fm_viddev_template = {
7e388496 MH	513	.fops = &fm_drv_fops,
	514	.ioctl_ops = &fm_drv_ioctl_ops,
	515	.name = FM_DRV_NAME,
cab9bf11	516	.release = video_device_release_empty,
ce4a3d52 HV	517	/*
	518	* To ensure both the tuner and modulator ioctls are accessible we
	519	* set the vfl_dir to M2M to indicate this.
	520	*
	521	* It is not really a mem2mem device of course, but it can both receive
	522	* and transmit using the same radio device. It's the only radio driver
	523	* that does this and it should really be split in two radio devices,
	524	* but that would affect applications using this driver.
	525	*/
	526	.vfl_dir = VFL_DIR_M2M,
7e388496 MH	527	};
	528
	529	int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
	530	{
	531	struct v4l2_ctrl *ctrl;
	532	int ret;
	533
c0decac1 MCC	534	strscpy(fmdev->v4l2_dev.name, FM_DRV_NAME,
c0decac1 MCC	535	sizeof(fmdev->v4l2_dev.name));
ae09e9e7 HV	536	ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
	537	if (ret < 0)
	538	return ret;
	539
7e388496 MH	540	/* Init mutex for core locking */
	541	mutex_init(&fmdev->mutex);
	542
7e388496	543	/* Setup FM driver's V4L2 properties */
cab9bf11	544	gradio_dev = fm_viddev_template;
7e388496	545
cab9bf11	546	video_set_drvdata(&gradio_dev, fmdev);
7e388496	547
cab9bf11 HV	548	gradio_dev.lock = &fmdev->mutex;
cab9bf11 HV	549	gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
7e388496 MH	550
7e388496 MH	551	/* Register with V4L2 subsystem as RADIO device */
cab9bf11	552	if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
7e388496 MH	553	fmerr("Could not register video device\n");
	554	return -ENOMEM;
	555	}
	556
cab9bf11	557	fmdev->radio_dev = &gradio_dev;
7e388496 MH	558
	559	/* Register to v4l2 ctrl handler framework */
	560	fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
	561
	562	ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
	563	if (ret < 0) {
	564	fmerr("(fmdev): Can't init ctrl handler\n");
	565	v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
	566	return -EBUSY;
	567	}
	568
	569	/*
	570	* Following controls are handled by V4L2 control framework.
	571	* Added in ascending ID order.
	572	*/
	573	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
	574	V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
	575	FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
	576
	577	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
	578	V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
	579
	580	v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
	581	V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
	582	0, V4L2_PREEMPHASIS_75_uS);
	583
	584	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
	585	V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
	586	FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
	587
	588	ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
	589	V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
	590	255, 1, 255);
	591
	592	if (ctrl)
88365105	593	ctrl->flags \|= V4L2_CTRL_FLAG_VOLATILE;
7e388496 MH	594
	595	return 0;
	596	}
	597
	598	void *fm_v4l2_deinit_video_device(void)
	599	{
	600	struct fmdev *fmdev;
	601
	602
cab9bf11	603	fmdev = video_get_drvdata(&gradio_dev);
7e388496 MH	604
	605	/* Unregister to v4l2 ctrl handler framework*/
	606	v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
	607
	608	/* Unregister RADIO device from V4L2 subsystem */
cab9bf11	609	video_unregister_device(&gradio_dev);
7e388496	610
ae09e9e7 HV	611	v4l2_device_unregister(&fmdev->v4l2_dev);
ae09e9e7 HV	612
7e388496 MH	613	return fmdev;
7e388496 MH	614	}