[2/2] media: radio: RDA5807: Added driver

Commit Message

Paul Cercueil March 2, 2021, 2:42 p.m. UTC

From: Maarten ter Huurne <[e-mail]>

Add a driver to support the RDA5807 FM radio I2C chip from Unisoc
Communications.

Tested and working with fmtools 2.x.

Signed-off-by: Maarten ter Huurne <[e-mail]>
Signed-off-by: Paul Cercueil <[e-mail]>
---
 drivers/media/radio/Kconfig         |  12 +
 drivers/media/radio/Makefile        |   1 +
 drivers/media/radio/radio-rda5807.c | 920 ++++++++++++++++++++++++++++
 3 files changed, 933 insertions(+)
 create mode 100644 drivers/media/radio/radio-rda5807.c

Comments

Hans Verkuil March 21, 2021, 8:34 a.m. UTC | #1

Hi Maarten,

Thank you for this patch.

Before I can accept this driver I have to see the output of v4l2-compliance -r /dev/radioX.

That utility is part of the v4l-utils git repo:

git://linuxtv.org/v4l-utils.git

Compile it from the master branch of that repo, don't rely on the version
distributed by distros since that's typically too old.

The compliance test must pass without failures and preferably without warnings.

Some more comments below:

On 02/03/2021 15:42, Paul Cercueil wrote:
> From: Maarten ter Huurne <[e-mail]>
> 
> Add a driver to support the RDA5807 FM radio I2C chip from Unisoc
> Communications.
> 
> Tested and working with fmtools 2.x.
> 
> Signed-off-by: Maarten ter Huurne <[e-mail]>
> Signed-off-by: Paul Cercueil <[e-mail]>
> ---
>  drivers/media/radio/Kconfig         |  12 +
>  drivers/media/radio/Makefile        |   1 +
>  drivers/media/radio/radio-rda5807.c | 920 ++++++++++++++++++++++++++++
>  3 files changed, 933 insertions(+)
>  create mode 100644 drivers/media/radio/radio-rda5807.c
> 
> diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
> index d29e29645e04..323faa7d3d52 100644
> --- a/drivers/media/radio/Kconfig
> +++ b/drivers/media/radio/Kconfig
> @@ -81,6 +81,18 @@ config RADIO_MAXIRADIO
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called radio-maxiradio.
>  
> +config RADIO_RDA5807
> +	tristate "RDA5807 I2C FM radio support"
> +	depends on I2C && VIDEO_V4L2
> +	select REGMAP_I2C
> +	select PM
> +	help
> +	  Say Y here if you want to use the RDA5807 FM receiver connected to
> +	  an I2C bus.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called radio-rda5807.
> +
>  config RADIO_SHARK
>  	tristate "Griffin radioSHARK USB radio receiver"
>  	depends on USB
> diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
> index 53c7ae135460..a85ccab640b0 100644
> --- a/drivers/media/radio/Makefile
> +++ b/drivers/media/radio/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_RADIO_SI4713) += si4713/
>  obj-$(CONFIG_USB_MR800) += radio-mr800.o
>  obj-$(CONFIG_USB_KEENE) += radio-keene.o
>  obj-$(CONFIG_USB_MA901) += radio-ma901.o
> +obj-$(CONFIG_RADIO_RDA5807) += radio-rda5807.o
>  obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o
>  obj-$(CONFIG_RADIO_SAA7706H) += saa7706h.o
>  obj-$(CONFIG_RADIO_TEF6862) += tef6862.o
> diff --git a/drivers/media/radio/radio-rda5807.c b/drivers/media/radio/radio-rda5807.c
> new file mode 100644
> index 000000000000..0f7796ca2575
> --- /dev/null
> +++ b/drivers/media/radio/radio-rda5807.c
> @@ -0,0 +1,920 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * radio-rda5807.c - Driver for using the RDA5807 FM tuner chip via I2C
> + *
> + * Copyright (c) 2011 Maarten ter Huurne <[e-mail]>
> + * Copyright (c) 2021 Paul Cercueil <[e-mail]>
> + *
> + * Many thanks to Jérôme Veres for his command line radio application that
> + * demonstrates how the chip can be controlled via I2C.
> + *
> + * Also thanks to Marcos Paulo de Souza for several patches to this driver.
> + *
> + * The RDA5807 has three ways of accessing registers:
> + * - I2C address 0x10: sequential access, RDA5800 style
> + * - I2C address 0x11: random access
> + * - I2C address 0x60: sequential access, TEA5767 compatible
> + *
> + * This driver only supports random access to the registers.
> + */
> +
> +
> +#include <linux/bitops.h>
> +#include <linux/bitfield.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +
> +
> +enum rda5807_reg {
> +	RDA5807_REG_CHIPID		= 0x00,
> +	RDA5807_REG_CTRL		= 0x02,
> +	RDA5807_REG_CHAN		= 0x03,
> +	RDA5807_REG_IOCFG		= 0x04,
> +	RDA5807_REG_INPUT		= 0x05,
> +	RDA5807_REG_BAND		= 0x07,
> +	RDA5807_REG_SEEKRES		= 0x0A,
> +	RDA5807_REG_SIGNAL		= 0x0B,
> +};
> +
> +#define RDA5807_CTRL_DHIZ		BIT(15)
> +#define RDA5807_CTRL_DMUTE		BIT(14)
> +#define RDA5807_CTRL_MONO		BIT(13)
> +#define RDA5807_CTRL_BASS		BIT(12)
> +#define RDA5807_CTRL_SEEKUP		BIT(9)
> +#define RDA5807_CTRL_SEEK		BIT(8)
> +#define RDA5807_CTRL_SKMODE		BIT(7)
> +#define RDA5807_CTRL_CLKMODE		GENMASK(6, 4)
> +#define RDA5807_CTRL_SOFTRESET		BIT(1)
> +#define RDA5807_CTRL_ENABLE		BIT(0)
> +
> +#define RDA5807_CHAN_WRCHAN		GENMASK(15, 6)
> +#define RDA5807_CHAN_TUNE		BIT(4)
> +#define RDA5807_CHAN_BAND		GENMASK(3, 2)
> +#define RDA5807_CHAN_SPACE		GENMASK(1, 0)
> +
> +#define RDA5807_IOCFG_DEEMPHASIS	BIT(11)
> +#define RDA5807_IOCFG_I2S_EN		BIT(6)
> +
> +#define RDA5807_INPUT_LNA_PORT		GENMASK(7, 6)
> +#define RDA5807_INPUT_LNA_ICSEL		GENMASK(5, 4)
> +#define RDA5807_INPUT_VOLUME		GENMASK(3, 0)
> +
> +#define RDA5807_BAND_65M_BAND		BIT(9)
> +
> +#define RDA5807_SEEKRES_COMPLETE	BIT(14)
> +#define RDA5807_SEEKRES_FAIL		BIT(13)
> +#define RDA5807_SEEKRES_STEREO		BIT(10)
> +#define RDA5807_SEEKRES_READCHAN	GENMASK(9, 0)
> +
> +#define RDA5807_SIGNAL_RSSI		GENMASK(15, 9)
> +
> +
> +#define RDA5807_AUTOSUSPEND_DELAY_MS	5000
> +
> +
> +struct rda5807_driver {
> +	struct v4l2_ctrl_handler ctrl_handler;
> +	struct video_device video_dev;
> +	struct v4l2_device v4l2_dev;
> +
> +	struct device *dev;
> +	struct regmap *map;
> +	struct regulator *supply;
> +
> +	const struct v4l2_frequency_band *band;
> +
> +	bool unmuted;
> +};
> +
> +enum rda5807_bands {
> +	RDA5807_BAND_WORLDWIDE,
> +	RDA5807_BAND_EAST_EUROPE,
> +	RDA5807_BAND_UNKNOWN,
> +};
> +
> +static const struct v4l2_frequency_band rda5807_bands[] = {
> +	[RDA5807_BAND_WORLDWIDE] = {
> +		.index = RDA5807_BAND_WORLDWIDE,
> +		.type = V4L2_TUNER_RADIO,
> +		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
> +			V4L2_TUNER_CAP_FREQ_BANDS,
> +		.rangelow = 1216000,   /* 76.0 MHz */
> +		.rangehigh = 1728000,  /* 108.0 MHz */
> +		.modulation = V4L2_BAND_MODULATION_FM,
> +	},
> +	[RDA5807_BAND_EAST_EUROPE] = {
> +		.index = RDA5807_BAND_EAST_EUROPE,
> +		.type = V4L2_TUNER_RADIO,
> +		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
> +			V4L2_TUNER_CAP_FREQ_BANDS,
> +		.rangelow = 1040000,   /* 65.0 MHz */
> +		.rangehigh = 1216000,  /* 76.0 MHz */
> +		.modulation = V4L2_BAND_MODULATION_FM,
> +	},
> +	[RDA5807_BAND_UNKNOWN] = {
> +		.index = RDA5807_BAND_UNKNOWN,
> +		.type = V4L2_TUNER_RADIO,
> +		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
> +			V4L2_TUNER_CAP_FREQ_BANDS,
> +		.rangelow = 800000,   /* 50.0 MHz */
> +		.rangehigh = 1040000,  /* 65.0 MHz */
> +		.modulation = V4L2_BAND_MODULATION_FM,
> +	},
> +};
> +
> +static const struct v4l2_frequency_band *rda5807_get_band(unsigned long min,
> +							  unsigned long max)
> +{
> +	const struct v4l2_frequency_band *band;
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(rda5807_bands); i++) {
> +		band = &rda5807_bands[i];
> +
> +		if (band->rangelow <= min && band->rangehigh >= max)
> +			return band;
> +	}
> +
> +	return NULL;
> +}
> +
> +static int rda5807_set_band(struct rda5807_driver *radio,
> +			    const struct v4l2_frequency_band *band)
> +{
> +	u16 val;
> +	int err;
> +
> +	if (band->index == RDA5807_BAND_EAST_EUROPE)
> +		err = regmap_set_bits(radio->map, RDA5807_REG_BAND,
> +				      RDA5807_BAND_65M_BAND);
> +	else
> +		err = regmap_clear_bits(radio->map, RDA5807_REG_BAND,
> +					RDA5807_BAND_65M_BAND);
> +	if (err)
> +		return err;
> +
> +	if (band->index == RDA5807_BAND_WORLDWIDE)
> +		val = FIELD_PREP(RDA5807_CHAN_BAND, 2);
> +	else
> +		val = FIELD_PREP(RDA5807_CHAN_BAND, 3);
> +
> +	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN,
> +				 RDA5807_CHAN_BAND, val);
> +	if (err)
> +		return err;
> +
> +	radio->band = band;
> +	return 0;
> +}
> +
> +static int rda5807_set_mute(struct rda5807_driver *radio, int muted)
> +{
> +	u16 val = muted ? 0 : RDA5807_CTRL_DMUTE /* disable mute */;
> +
> +	dev_dbg(radio->dev, "set mute to %d\n", muted);
> +
> +	return regmap_update_bits(radio->map, RDA5807_REG_CTRL,
> +				  RDA5807_CTRL_DMUTE, val);
> +}
> +
> +static int rda5807_set_volume(struct rda5807_driver *radio, int volume)
> +{
> +	dev_dbg(radio->dev, "set volume to %d\n", volume);
> +
> +	return regmap_update_bits(radio->map, RDA5807_REG_INPUT,
> +				  RDA5807_INPUT_VOLUME,
> +				  FIELD_PREP(RDA5807_INPUT_VOLUME, volume));
> +}
> +
> +static int rda5807_set_deemphasis(struct rda5807_driver *radio,
> +				  enum v4l2_deemphasis deemp)
> +{
> +	int err;
> +
> +	if (deemp == V4L2_DEEMPHASIS_50_uS)
> +		err = regmap_set_bits(radio->map, RDA5807_REG_IOCFG,
> +				      RDA5807_IOCFG_DEEMPHASIS);
> +	else
> +		err = regmap_clear_bits(radio->map, RDA5807_REG_IOCFG,
> +					RDA5807_IOCFG_DEEMPHASIS);
> +
> +	dev_dbg(radio->dev, "set deemphasis to %d\n", deemp);
> +	return err;
> +}
> +
> +static inline struct rda5807_driver *ctrl_to_radio(struct v4l2_ctrl *ctrl)
> +{
> +	return container_of(ctrl->handler, struct rda5807_driver, ctrl_handler);
> +}
> +
> +static int rda5807_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct rda5807_driver *radio = ctrl_to_radio(ctrl);
> +	int err;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_AUDIO_MUTE:
> +		if (radio->unmuted == !ctrl->val)
> +			break;
> +
> +		if (ctrl->val) {
> +			pm_runtime_mark_last_busy(radio->dev);
> +			err = pm_runtime_put_autosuspend(radio->dev);
> +			if (err < 0)
> +				return err;
> +		} else {
> +			err = pm_runtime_get_sync(radio->dev);
> +			if (err < 0) {
> +				pm_runtime_put_noidle(radio->dev);
> +				return err;
> +			}
> +		}
> +
> +		err = rda5807_set_mute(radio, ctrl->val);
> +		if (err)
> +			return err;
> +
> +		radio->unmuted = !ctrl->val;
> +		break;
> +	case V4L2_CID_AUDIO_VOLUME:
> +		return rda5807_set_volume(radio, ctrl->val);
> +	case V4L2_CID_TUNE_DEEMPHASIS:
> +		return rda5807_set_deemphasis(radio, ctrl->val);
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops rda5807_ctrl_ops = {
> +	.s_ctrl = rda5807_s_ctrl,
> +};
> +
> +static int rda5807_vidioc_querycap(struct file *file, void *fh,
> +				   struct v4l2_capability *cap)
> +{
> +	*cap = (struct v4l2_capability) {
> +		.driver		= "rda5807",
> +		.card		= "RDA5807 FM receiver",
> +		.bus_info	= "I2C",
> +		.device_caps	= V4L2_CAP_RADIO | V4L2_CAP_TUNER
> +						 | V4L2_CAP_HW_FREQ_SEEK,
> +	};
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

Don't set device_caps and capabilities here. Instead fill in device_caps
of struct video_device when you initialize that.

And bus_info isn't set correctly either. See vidioc_querycap in
drivers/media/radio/radio-tea5764.c on how to do this.

> +
> +	return 0;
> +}
> +
> +static int rda5807_vidioc_g_audio(struct file *file, void *fh,
> +				  struct v4l2_audio *a)
> +{
> +	if (a->index != 0)
> +		return -EINVAL;
> +
> +	*a = (struct v4l2_audio) {
> +		.name = "Radio",
> +		.capability = V4L2_AUDCAP_STEREO,
> +		.mode = 0,
> +	};
> +
> +	return 0;
> +}

Radio devices do not support g_audio. You can drop this.

> +
> +static int rda5807_vidioc_g_tuner(struct file *file, void *fh,
> +				  struct v4l2_tuner *a)
> +{
> +	struct rda5807_driver *radio = video_drvdata(file);
> +	unsigned int seekres, signal;
> +	u32 rxsubchans;
> +	int err, active;
> +
> +	if (a->index != 0)
> +		return -EINVAL;
> +
> +	active = pm_runtime_get_if_in_use(radio->dev);
> +	if (active < 0)
> +		return active;
> +
> +	if (active == 0) {
> +		signal = 0;
> +		rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
> +	} else {
> +		err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &seekres);
> +		if (err < 0)
> +			goto out_runtime_pm_put;
> +
> +		if (seekres & RDA5807_SEEKRES_COMPLETE &&
> +		    !(seekres & RDA5807_SEEKRES_FAIL))
> +			/* mono/stereo known */
> +			rxsubchans = seekres & RDA5807_SEEKRES_STEREO
> +				? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
> +		else
> +			/* mono/stereo unknown */
> +			rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
> +
> +		err = regmap_read(radio->map, RDA5807_REG_SIGNAL, &signal);
> +		if (err < 0)
> +			goto out_runtime_pm_put;
> +	}
> +
> +	*a = (struct v4l2_tuner) {
> +		.name = "FM",
> +		.type = V4L2_TUNER_RADIO,
> +		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO,
> +		/* unit is 1/16 kHz */
> +		.rangelow   = 50000 * 16,
> +		.rangehigh  = 108000 * 16,
> +		.rxsubchans = rxsubchans,
> +		/* TODO: Implement forced mono (RDA5807_CTRL_MONO). */
> +		.audmode = V4L2_TUNER_MODE_STEREO,
> +		.signal = signal & RDA5807_SIGNAL_RSSI,
> +		.afc = 0, /* automatic frequency control */
> +	};

Just do:

	strscpy(a->name, "FM", sizeof(a->name));
	a->type = V4L2_TUNER_RADIO;

etc.

> +
> +	err = 0;
> +out_runtime_pm_put:
> +	if (active > 0) {
> +		pm_runtime_mark_last_busy(radio->dev);
> +		pm_runtime_put_autosuspend(radio->dev);
> +	}
> +	return err;
> +}
> +
> +static int rda5807_vidioc_g_frequency(struct file *file, void *fh,
> +				      struct v4l2_frequency *a)
> +{
> +	struct rda5807_driver *radio = video_drvdata(file);
> +	unsigned int val;
> +	int err;
> +
> +	if (a->tuner != 0)
> +		return -EINVAL;
> +	if (!radio->band)
> +		return -EINVAL;
> +
> +	err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &val);
> +	if (err < 0)
> +		return err;
> +
> +	a->frequency = 400 * (val & RDA5807_SEEKRES_READCHAN) + radio->band->rangelow;
> +	return 0;
> +}
> +
> +static int rda5807_vidioc_s_frequency(struct file *file, void *fh,
> +				      const struct v4l2_frequency *a)
> +{
> +	struct rda5807_driver *radio = video_drvdata(file);
> +	const struct v4l2_frequency_band *band;
> +	u16 mask = 0;
> +	u16 val = 0;
> +	int err, active;
> +
> +	if (a->tuner != 0)
> +		return -EINVAL;
> +	if (a->type != V4L2_TUNER_RADIO)
> +		return -EINVAL;
> +
> +	band = rda5807_get_band(a->frequency, a->frequency);
> +	if (!band)
> +		return -ERANGE;
> +
> +	dev_dbg(radio->dev, "set freq to %u kHz\n", a->frequency / 16);
> +
> +	err = rda5807_set_band(radio, band);
> +	if (err)
> +		return err;
> +
> +	/* select 25 kHz channel spacing */
> +	mask |= RDA5807_CHAN_SPACE;
> +	val  |= FIELD_PREP(RDA5807_CHAN_SPACE, 0x3);
> +
> +	/* select frequency */
> +	mask |= RDA5807_CHAN_WRCHAN;
> +	val  |= FIELD_PREP(RDA5807_CHAN_WRCHAN, (a->frequency + 200) / 400);
> +
> +	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN, mask, val);
> +	if (err)
> +		return err;
> +
> +	active = pm_runtime_get_if_in_use(radio->dev);
> +	if (active <= 0)
> +		return active;
> +
> +	/* start tune operation */
> +	err = regmap_write_bits(radio->map, RDA5807_REG_CHAN,
> +				RDA5807_CHAN_TUNE, RDA5807_CHAN_TUNE);
> +
> +	pm_runtime_mark_last_busy(radio->dev);
> +	pm_runtime_put_autosuspend(radio->dev);
> +
> +	return err;
> +}
> +
> +static int rda5807_vidioc_s_hw_freq_seek(struct file *file, void *fh,
> +					 const struct v4l2_hw_freq_seek *a)
> +{
> +	struct rda5807_driver *radio = video_drvdata(file);
> +	const struct v4l2_frequency_band *band;
> +	unsigned int val = RDA5807_CTRL_SEEK;
> +	unsigned int freq, spacing, increment;
> +	int err;
> +
> +	if (a->tuner != 0)
> +		return -EINVAL;
> +	if (a->type != V4L2_TUNER_RADIO)
> +		return -EINVAL;
> +
> +	switch (a->spacing) {
> +	case 25000:
> +		spacing = 0x3;
> +		break;
> +	case 50000:
> +		spacing = 0x2;
> +		break;
> +	case 100000:
> +		spacing = 0x0;
> +		break;
> +	case 200000:
> +		spacing = 0x1;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	band = rda5807_get_band(a->rangelow, a->rangehigh);
> +	if (!band)
> +		return -ERANGE;
> +
> +	err = pm_runtime_get_sync(radio->dev);
> +	if (err < 0) {
> +		dev_err(radio->dev, "Unable to runtime get: %d\n", err);
> +		pm_runtime_put_noidle(radio->dev);
> +		return err;
> +	}
> +
> +	/* Configure channel spacing */
> +	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN,
> +				 RDA5807_CHAN_SPACE,
> +				 FIELD_PREP(RDA5807_CHAN_SPACE, spacing));
> +	if (err < 0)
> +		goto out_runtime_pm_put;
> +
> +	err = rda5807_set_band(radio, band);
> +	if (err < 0)
> +		goto out_runtime_pm_put;
> +
> +	/* seek up or down? */
> +	if (a->seek_upward)
> +		val |= RDA5807_CTRL_SEEKUP;
> +
> +	/* wrap around at band limit? */
> +	if (!a->wrap_around)
> +		val |= RDA5807_CTRL_SKMODE;
> +
> +	/* Send seek command */
> +	err = regmap_update_bits(radio->map, RDA5807_REG_CTRL,
> +				 RDA5807_CTRL_SEEKUP |
> +				 RDA5807_CTRL_SKMODE |
> +				 RDA5807_CTRL_SEEK, val);
> +	if (err < 0)
> +		goto out_runtime_pm_put;
> +
> +	increment = a->spacing * 16 / 1000;
> +
> +	for (freq = a->rangelow; freq <= a->rangehigh; freq += increment) {
> +		/*
> +		 * The programming guide says we should wait for 35 ms for each
> +		 * frequency tested.
> +		 */
> +		msleep(35);
> +
> +		err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &val);
> +		if (err < 0)
> +			goto out_runtime_pm_put;
> +
> +		/* Seek done? */
> +		if (val & RDA5807_SEEKRES_COMPLETE)
> +			break;
> +	}
> +
> +	err = regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
> +				RDA5807_CTRL_SEEK);
> +	if (err)
> +		goto out_runtime_pm_put;
> +
> +	if (freq > a->rangehigh)
> +		err = -ETIMEDOUT;
> +
> +out_runtime_pm_put:
> +	pm_runtime_mark_last_busy(radio->dev);
> +	pm_runtime_put_autosuspend(radio->dev);
> +	return err;
> +}
> +
> +static int rda5807_vidioc_enum_freq_bands(struct file *file, void *priv,
> +					  struct v4l2_frequency_band *band)
> +{
> +	if (band->index >= ARRAY_SIZE(rda5807_bands))
> +		return -EINVAL;
> +
> +	*band = rda5807_bands[band->index];
> +	return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops rda5807_ioctl_ops = {
> +	.vidioc_querycap	= rda5807_vidioc_querycap,
> +	.vidioc_g_audio		= rda5807_vidioc_g_audio,
> +	.vidioc_g_tuner		= rda5807_vidioc_g_tuner,
> +	.vidioc_g_frequency	= rda5807_vidioc_g_frequency,
> +	.vidioc_s_frequency	= rda5807_vidioc_s_frequency,
> +	.vidioc_s_hw_freq_seek  = rda5807_vidioc_s_hw_freq_seek,
> +	.vidioc_enum_freq_bands	= rda5807_vidioc_enum_freq_bands,

You're missing these three:

        .vidioc_log_status  = v4l2_ctrl_log_status,
        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,

> +};
> +
> +static const u16 rda5807_lna_current[] = { 1800, 2100, 2500, 3000 };
> +
> +static int rda5807_setup(struct rda5807_driver *radio)
> +{
> +	struct device *dev = radio->dev;
> +	u16 lna = 0, iocfg = 0, ctrl = 0;
> +	u32 lna_current = 2500;
> +	size_t i;
> +	int err;
> +
> +	/* Configure chip inputs. */
> +
> +	if (device_property_read_bool(dev, "rda,lnan"))
> +		lna |= 0x1;
> +	if (device_property_read_bool(dev, "rda,lnap"))
> +		lna |= 0x2;
> +	if (!lna)
> +		dev_warn(dev, "Both LNA inputs disabled\n");
> +
> +	device_property_read_u32(dev, "rda,lna-microamp", &lna_current);
> +	for (i = 0; i < ARRAY_SIZE(rda5807_lna_current); i++)
> +		if (rda5807_lna_current[i] == lna_current)
> +			break;
> +	if (i == ARRAY_SIZE(rda5807_lna_current)) {
> +		dev_err(dev, "Invalid LNA current value\n");
> +		return -EINVAL;
> +	}
> +
> +	err = regmap_update_bits(radio->map, RDA5807_REG_INPUT,
> +				 RDA5807_INPUT_LNA_ICSEL | RDA5807_INPUT_LNA_PORT,
> +				 FIELD_PREP(RDA5807_INPUT_LNA_ICSEL, i) |
> +				 FIELD_PREP(RDA5807_INPUT_LNA_PORT, lna));
> +	if (err)
> +		return err;
> +
> +	/* Configure chip outputs. */
> +
> +	if (device_property_read_bool(dev, "rda,i2s-out"))
> +		iocfg |= RDA5807_IOCFG_I2S_EN;
> +
> +	if (device_property_read_bool(dev, "rda,analog-out"))
> +		ctrl |= RDA5807_CTRL_DHIZ;
> +
> +	err = regmap_write(radio->map, RDA5807_REG_IOCFG, iocfg);
> +	if (err)
> +		return err;
> +
> +	err = regmap_write(radio->map, RDA5807_REG_CTRL, ctrl);
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}
> +
> +static int rda5807_enable_regulator(struct rda5807_driver *radio)
> +{
> +	int err;
> +
> +	err = regulator_enable(radio->supply);
> +	if (err)
> +		return err;
> +
> +	/* A little sleep is needed before the registers can be accessed */
> +	msleep(20);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_file_operations rda5807_fops = {
> +	.owner		= THIS_MODULE,

You're missing these three:

        .open           = v4l2_fh_open,
        .release        = v4l2_fh_release,
        .poll           = v4l2_ctrl_poll,

> +	.unlocked_ioctl	= video_ioctl2,
> +};
> +
> +static const struct regmap_range rda5807_no_write_ranges[] = {
> +	{ RDA5807_REG_CHIPID, RDA5807_REG_CHIPID },
> +	{ RDA5807_REG_SEEKRES, RDA5807_REG_SIGNAL },
> +};
> +
> +static const struct regmap_access_table rda5807_write_table = {
> +	.no_ranges = rda5807_no_write_ranges,
> +	.n_no_ranges = ARRAY_SIZE(rda5807_no_write_ranges),
> +};
> +
> +static const struct regmap_range rda5807_volatile_ranges[] = {
> +	{ RDA5807_REG_SEEKRES, RDA5807_REG_SIGNAL },
> +};
> +
> +
> +static const struct regmap_access_table rda5807_volatile_table = {
> +	.yes_ranges = rda5807_volatile_ranges,
> +	.n_yes_ranges = ARRAY_SIZE(rda5807_volatile_ranges),
> +};
> +
> +static const struct reg_default rda5807_reg_defaults[] = {
> +	{ RDA5807_REG_CHIPID, 0x5804 },
> +	{ RDA5807_REG_CTRL, 0x0 },
> +	{ RDA5807_REG_CHAN, 0x4fc0 },
> +	{ RDA5807_REG_IOCFG, 0x0400 },
> +	{ RDA5807_REG_INPUT, 0x888b },
> +	{ RDA5807_REG_BAND, 0x5ec6 },
> +};
> +
> +static const struct regmap_config rda5807_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 16,
> +	.max_register = RDA5807_REG_SIGNAL,
> +
> +	.wr_table = &rda5807_write_table,
> +	.volatile_table = &rda5807_volatile_table,
> +
> +	.reg_defaults = rda5807_reg_defaults,
> +	.num_reg_defaults = ARRAY_SIZE(rda5807_reg_defaults),
> +
> +	.cache_type = REGCACHE_FLAT,
> +};
> +
> +static int rda5807_i2c_probe(struct i2c_client *client,
> +			     const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct rda5807_driver *radio;
> +	unsigned int chipid;
> +	int err;
> +
> +	radio = devm_kzalloc(dev, sizeof(*radio), GFP_KERNEL);
> +	if (!radio)
> +		return -ENOMEM;
> +
> +	radio->dev = dev;
> +
> +	radio->map = devm_regmap_init_i2c(client, &rda5807_regmap_config);
> +	if (IS_ERR(radio->map)) {
> +		dev_err(dev, "Failed to create regmap\n");
> +		return PTR_ERR(radio->map);
> +	}
> +
> +	radio->supply = devm_regulator_get(dev, "power");
> +	if (IS_ERR(radio->supply)) {
> +		dev_err(dev, "Failed to get power supply\n");
> +		return PTR_ERR(radio->supply);
> +	}
> +
> +	err = rda5807_enable_regulator(radio);
> +	if (err) {
> +		dev_err(dev, "Failed to enable regulator\n");
> +		return err;
> +	}
> +
> +	/* Disable the regmap cache temporarily to force reading the chip ID */
> +	regcache_cache_bypass(radio->map, true);
> +	err = regmap_read(radio->map, RDA5807_REG_CHIPID, &chipid);
> +	regcache_cache_bypass(radio->map, false);
> +
> +	regulator_disable(radio->supply);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to read chip ID\n");
> +		return err;
> +	}
> +
> +	if ((chipid & 0xFF00) != 0x5800) {
> +		dev_err(dev, "Chip ID mismatch: expected 58xx, got %04X\n",
> +			chipid);
> +		return -ENODEV;
> +	}
> +
> +	dev_info(dev, "Found FM radio receiver\n");
> +
> +	pm_runtime_set_autosuspend_delay(dev, RDA5807_AUTOSUSPEND_DELAY_MS);
> +	pm_runtime_use_autosuspend(dev);
> +	pm_runtime_set_suspended(dev);
> +	pm_runtime_enable(dev);
> +
> +	/* Only use regmap cache until the chip is brought up */
> +	regcache_cache_only(radio->map, true);
> +	regcache_mark_dirty(radio->map);
> +
> +	err = rda5807_setup(radio);
> +	if (err) {
> +		dev_err(dev, "Failed to setup registers\n");
> +		return err;
> +	}
> +
> +	/* Initialize controls. */
> +	v4l2_ctrl_handler_init(&radio->ctrl_handler, 3);
> +	v4l2_ctrl_new_std(&radio->ctrl_handler, &rda5807_ctrl_ops,
> +			  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
> +	v4l2_ctrl_new_std(&radio->ctrl_handler, &rda5807_ctrl_ops,
> +			  V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 8);
> +
> +	v4l2_ctrl_new_std_menu(&radio->ctrl_handler, &rda5807_ctrl_ops,
> +			       V4L2_CID_TUNE_DEEMPHASIS,
> +			       V4L2_DEEMPHASIS_75_uS,
> +			       BIT(V4L2_DEEMPHASIS_DISABLED),
> +			       V4L2_DEEMPHASIS_50_uS);
> +	err = radio->ctrl_handler.error;
> +	if (err) {
> +		dev_err(dev, "Failed to init controls handler\n");
> +		goto err_ctrl_free;
> +	}
> +
> +	err = v4l2_device_register(dev, &radio->v4l2_dev);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to register v4l2 device\n");
> +		goto err_ctrl_free;
> +	}
> +
> +	radio->video_dev = (struct video_device) {
> +		.name = "RDA5807 FM receiver",
> +		.v4l2_dev = &radio->v4l2_dev,
> +		.ctrl_handler = &radio->ctrl_handler,
> +		.fops = &rda5807_fops,
> +		.ioctl_ops = &rda5807_ioctl_ops,
> +		.release = video_device_release_empty,
> +		.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER
> +					      | V4L2_CAP_HW_FREQ_SEEK,
> +	};

I prefer initializing this per field. Again, drivers/media/radio/radio-tea5764.c
is a good reference driver.

> +
> +	i2c_set_clientdata(client, radio);
> +	video_set_drvdata(&radio->video_dev, radio);
> +
> +	err = v4l2_ctrl_handler_setup(&radio->ctrl_handler);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to set default control values\n");
> +		goto err_video_unreg;
> +	}
> +
> +	err = video_register_device(&radio->video_dev, VFL_TYPE_RADIO, -1);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to register video device\n");
> +		goto err_ctrl_free;
> +	}
> +
> +	return 0;
> +
> +err_video_unreg:
> +	video_unregister_device(&radio->video_dev);
> +err_ctrl_free:
> +	v4l2_ctrl_handler_free(&radio->ctrl_handler);
> +	video_device_release_empty(&radio->video_dev);

video_device_release_empty() doesn't do anything. Instead do this:

                v4l2_device_unregister(&radio->v4l2_dev);
                kfree(radio);

> +
> +	return err;
> +}
> +
> +static int rda5807_i2c_remove(struct i2c_client *client)
> +{
> +	struct rda5807_driver *radio = i2c_get_clientdata(client);
> +	struct device *dev = &client->dev;
> +
> +	pm_runtime_disable(dev);
> +	pm_runtime_force_suspend(dev);
> +	pm_runtime_dont_use_autosuspend(dev);
> +
> +	video_unregister_device(&radio->video_dev);
> +	v4l2_ctrl_handler_free(&radio->ctrl_handler);
> +	video_device_release_empty(&radio->video_dev);

video_device_release_empty() doesn't do anything. Instead do this:

                v4l2_device_unregister(&radio->v4l2_dev);
                kfree(radio);

> +
> +	return 0;
> +}
> +
> +static int rda5807_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct rda5807_driver *radio = i2c_get_clientdata(client);
> +	int err;
> +
> +	err = regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
> +				RDA5807_CTRL_ENABLE);
> +	if (err)
> +		return err;
> +
> +	regcache_cache_only(radio->map, true);
> +	regcache_mark_dirty(radio->map);
> +
> +	err = regulator_disable(radio->supply);
> +	if (err)
> +		return err;
> +
> +	dev_dbg(radio->dev, "Disabled\n");
> +
> +	return 0;
> +}
> +
> +static int rda5807_reset_chip(struct rda5807_driver *radio)
> +{
> +	int err;
> +
> +	err = regmap_write_bits(radio->map, RDA5807_REG_CTRL,
> +				RDA5807_CTRL_SOFTRESET, RDA5807_CTRL_SOFTRESET);
> +	if (err)
> +		return err;
> +
> +	usleep_range(1000, 10000);
> +
> +	return regmap_write_bits(radio->map, RDA5807_REG_CTRL,
> +				 RDA5807_CTRL_SOFTRESET, 0);
> +}
> +
> +static int rda5807_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct rda5807_driver *radio = i2c_get_clientdata(client);
> +	int err;
> +
> +	err = rda5807_enable_regulator(radio);
> +	if (err)
> +		return err;
> +
> +	regcache_cache_only(radio->map, false);
> +
> +	err = rda5807_reset_chip(radio);
> +	if (err)
> +		return err;
> +
> +	/* Restore cached registers to hardware */
> +	err = regcache_sync(radio->map);
> +	if (err) {
> +		dev_err(dev, "Failed to restore regs: %d\n", err);
> +		goto err_regulator_disable;
> +	}
> +
> +	err = regmap_set_bits(radio->map, RDA5807_REG_CTRL,
> +			      RDA5807_CTRL_ENABLE);
> +	if (err) {
> +		dev_err(dev, "Failed to enable radio: %d\n", err);
> +		goto err_regulator_disable;
> +	}
> +
> +	err = regmap_write_bits(radio->map, RDA5807_REG_CHAN,
> +				RDA5807_CHAN_TUNE, RDA5807_CHAN_TUNE);
> +	if (err) {
> +		dev_err(dev, "Failed to tune radio: %d\n", err);
> +		goto err_radio_disable;
> +	}
> +
> +	dev_dbg(radio->dev, "Enabled\n");
> +
> +	return 0;
> +
> +err_radio_disable:
> +	regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
> +			  RDA5807_CTRL_ENABLE);
> +err_regulator_disable:
> +	regulator_disable(radio->supply);
> +	return err;
> +}
> +
> +static UNIVERSAL_DEV_PM_OPS(rda5807_pm_ops, rda5807_suspend, rda5807_resume, NULL);
> +
> +static const struct of_device_id rda5807_dt_ids[] = {
> +	{ .compatible = "rda,rda5807" },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, rda5807_dt_ids);
> +
> +static const struct i2c_device_id rda5807_id[] = {
> +	{ "rda5807", 0 },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i2c, rda5807_id);
> +
> +static struct i2c_driver rda5807_i2c_driver = {
> +	.driver = {
> +		.name = "radio-rda5807",
> +		.of_match_table = of_match_ptr(rda5807_dt_ids),
> +		.pm = &rda5807_pm_ops,
> +	},
> +	.probe = rda5807_i2c_probe,
> +	.remove = rda5807_i2c_remove,
> +	.id_table = rda5807_id,
> +};
> +module_i2c_driver(rda5807_i2c_driver);
> +
> +MODULE_AUTHOR("Maarten ter Huurne <[e-mail]>");
> +MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
> +MODULE_DESCRIPTION("RDA5807 FM tuner driver");
> +MODULE_LICENSE("GPL");
> 

Regards,

	Hans

Patch

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index d29e29645e04..323faa7d3d52 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -81,6 +81,18 @@  config RADIO_MAXIRADIO
 	  To compile this driver as a module, choose M here: the
 	  module will be called radio-maxiradio.
 
+config RADIO_RDA5807
+	tristate "RDA5807 I2C FM radio support"
+	depends on I2C && VIDEO_V4L2
+	select REGMAP_I2C
+	select PM
+	help
+	  Say Y here if you want to use the RDA5807 FM receiver connected to
+	  an I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-rda5807.
+
 config RADIO_SHARK
 	tristate "Griffin radioSHARK USB radio receiver"
 	depends on USB
diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
index 53c7ae135460..a85ccab640b0 100644
--- a/drivers/media/radio/Makefile
+++ b/drivers/media/radio/Makefile
@@ -26,6 +26,7 @@  obj-$(CONFIG_RADIO_SI4713) += si4713/
 obj-$(CONFIG_USB_MR800) += radio-mr800.o
 obj-$(CONFIG_USB_KEENE) += radio-keene.o
 obj-$(CONFIG_USB_MA901) += radio-ma901.o
+obj-$(CONFIG_RADIO_RDA5807) += radio-rda5807.o
 obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o
 obj-$(CONFIG_RADIO_SAA7706H) += saa7706h.o
 obj-$(CONFIG_RADIO_TEF6862) += tef6862.o
diff --git a/drivers/media/radio/radio-rda5807.c b/drivers/media/radio/radio-rda5807.c
new file mode 100644
index 000000000000..0f7796ca2575
--- /dev/null
+++ b/drivers/media/radio/radio-rda5807.c
@@ -0,0 +1,920 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * radio-rda5807.c - Driver for using the RDA5807 FM tuner chip via I2C
+ *
+ * Copyright (c) 2011 Maarten ter Huurne <[e-mail]>
+ * Copyright (c) 2021 Paul Cercueil <[e-mail]>
+ *
+ * Many thanks to Jérôme Veres for his command line radio application that
+ * demonstrates how the chip can be controlled via I2C.
+ *
+ * Also thanks to Marcos Paulo de Souza for several patches to this driver.
+ *
+ * The RDA5807 has three ways of accessing registers:
+ * - I2C address 0x10: sequential access, RDA5800 style
+ * - I2C address 0x11: random access
+ * - I2C address 0x60: sequential access, TEA5767 compatible
+ *
+ * This driver only supports random access to the registers.
+ */
+
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+
+
+enum rda5807_reg {
+	RDA5807_REG_CHIPID		= 0x00,
+	RDA5807_REG_CTRL		= 0x02,
+	RDA5807_REG_CHAN		= 0x03,
+	RDA5807_REG_IOCFG		= 0x04,
+	RDA5807_REG_INPUT		= 0x05,
+	RDA5807_REG_BAND		= 0x07,
+	RDA5807_REG_SEEKRES		= 0x0A,
+	RDA5807_REG_SIGNAL		= 0x0B,
+};
+
+#define RDA5807_CTRL_DHIZ		BIT(15)
+#define RDA5807_CTRL_DMUTE		BIT(14)
+#define RDA5807_CTRL_MONO		BIT(13)
+#define RDA5807_CTRL_BASS		BIT(12)
+#define RDA5807_CTRL_SEEKUP		BIT(9)
+#define RDA5807_CTRL_SEEK		BIT(8)
+#define RDA5807_CTRL_SKMODE		BIT(7)
+#define RDA5807_CTRL_CLKMODE		GENMASK(6, 4)
+#define RDA5807_CTRL_SOFTRESET		BIT(1)
+#define RDA5807_CTRL_ENABLE		BIT(0)
+
+#define RDA5807_CHAN_WRCHAN		GENMASK(15, 6)
+#define RDA5807_CHAN_TUNE		BIT(4)
+#define RDA5807_CHAN_BAND		GENMASK(3, 2)
+#define RDA5807_CHAN_SPACE		GENMASK(1, 0)
+
+#define RDA5807_IOCFG_DEEMPHASIS	BIT(11)
+#define RDA5807_IOCFG_I2S_EN		BIT(6)
+
+#define RDA5807_INPUT_LNA_PORT		GENMASK(7, 6)
+#define RDA5807_INPUT_LNA_ICSEL		GENMASK(5, 4)
+#define RDA5807_INPUT_VOLUME		GENMASK(3, 0)
+
+#define RDA5807_BAND_65M_BAND		BIT(9)
+
+#define RDA5807_SEEKRES_COMPLETE	BIT(14)
+#define RDA5807_SEEKRES_FAIL		BIT(13)
+#define RDA5807_SEEKRES_STEREO		BIT(10)
+#define RDA5807_SEEKRES_READCHAN	GENMASK(9, 0)
+
+#define RDA5807_SIGNAL_RSSI		GENMASK(15, 9)
+
+
+#define RDA5807_AUTOSUSPEND_DELAY_MS	5000
+
+
+struct rda5807_driver {
+	struct v4l2_ctrl_handler ctrl_handler;
+	struct video_device video_dev;
+	struct v4l2_device v4l2_dev;
+
+	struct device *dev;
+	struct regmap *map;
+	struct regulator *supply;
+
+	const struct v4l2_frequency_band *band;
+
+	bool unmuted;
+};
+
+enum rda5807_bands {
+	RDA5807_BAND_WORLDWIDE,
+	RDA5807_BAND_EAST_EUROPE,
+	RDA5807_BAND_UNKNOWN,
+};
+
+static const struct v4l2_frequency_band rda5807_bands[] = {
+	[RDA5807_BAND_WORLDWIDE] = {
+		.index = RDA5807_BAND_WORLDWIDE,
+		.type = V4L2_TUNER_RADIO,
+		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
+			V4L2_TUNER_CAP_FREQ_BANDS,
+		.rangelow = 1216000,   /* 76.0 MHz */
+		.rangehigh = 1728000,  /* 108.0 MHz */
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+	[RDA5807_BAND_EAST_EUROPE] = {
+		.index = RDA5807_BAND_EAST_EUROPE,
+		.type = V4L2_TUNER_RADIO,
+		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
+			V4L2_TUNER_CAP_FREQ_BANDS,
+		.rangelow = 1040000,   /* 65.0 MHz */
+		.rangehigh = 1216000,  /* 76.0 MHz */
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+	[RDA5807_BAND_UNKNOWN] = {
+		.index = RDA5807_BAND_UNKNOWN,
+		.type = V4L2_TUNER_RADIO,
+		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
+			V4L2_TUNER_CAP_FREQ_BANDS,
+		.rangelow = 800000,   /* 50.0 MHz */
+		.rangehigh = 1040000,  /* 65.0 MHz */
+		.modulation = V4L2_BAND_MODULATION_FM,
+	},
+};
+
+static const struct v4l2_frequency_band *rda5807_get_band(unsigned long min,
+							  unsigned long max)
+{
+	const struct v4l2_frequency_band *band;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(rda5807_bands); i++) {
+		band = &rda5807_bands[i];
+
+		if (band->rangelow <= min && band->rangehigh >= max)
+			return band;
+	}
+
+	return NULL;
+}
+
+static int rda5807_set_band(struct rda5807_driver *radio,
+			    const struct v4l2_frequency_band *band)
+{
+	u16 val;
+	int err;
+
+	if (band->index == RDA5807_BAND_EAST_EUROPE)
+		err = regmap_set_bits(radio->map, RDA5807_REG_BAND,
+				      RDA5807_BAND_65M_BAND);
+	else
+		err = regmap_clear_bits(radio->map, RDA5807_REG_BAND,
+					RDA5807_BAND_65M_BAND);
+	if (err)
+		return err;
+
+	if (band->index == RDA5807_BAND_WORLDWIDE)
+		val = FIELD_PREP(RDA5807_CHAN_BAND, 2);
+	else
+		val = FIELD_PREP(RDA5807_CHAN_BAND, 3);
+
+	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN,
+				 RDA5807_CHAN_BAND, val);
+	if (err)
+		return err;
+
+	radio->band = band;
+	return 0;
+}
+
+static int rda5807_set_mute(struct rda5807_driver *radio, int muted)
+{
+	u16 val = muted ? 0 : RDA5807_CTRL_DMUTE /* disable mute */;
+
+	dev_dbg(radio->dev, "set mute to %d\n", muted);
+
+	return regmap_update_bits(radio->map, RDA5807_REG_CTRL,
+				  RDA5807_CTRL_DMUTE, val);
+}
+
+static int rda5807_set_volume(struct rda5807_driver *radio, int volume)
+{
+	dev_dbg(radio->dev, "set volume to %d\n", volume);
+
+	return regmap_update_bits(radio->map, RDA5807_REG_INPUT,
+				  RDA5807_INPUT_VOLUME,
+				  FIELD_PREP(RDA5807_INPUT_VOLUME, volume));
+}
+
+static int rda5807_set_deemphasis(struct rda5807_driver *radio,
+				  enum v4l2_deemphasis deemp)
+{
+	int err;
+
+	if (deemp == V4L2_DEEMPHASIS_50_uS)
+		err = regmap_set_bits(radio->map, RDA5807_REG_IOCFG,
+				      RDA5807_IOCFG_DEEMPHASIS);
+	else
+		err = regmap_clear_bits(radio->map, RDA5807_REG_IOCFG,
+					RDA5807_IOCFG_DEEMPHASIS);
+
+	dev_dbg(radio->dev, "set deemphasis to %d\n", deemp);
+	return err;
+}
+
+static inline struct rda5807_driver *ctrl_to_radio(struct v4l2_ctrl *ctrl)
+{
+	return container_of(ctrl->handler, struct rda5807_driver, ctrl_handler);
+}
+
+static int rda5807_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct rda5807_driver *radio = ctrl_to_radio(ctrl);
+	int err;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		if (radio->unmuted == !ctrl->val)
+			break;
+
+		if (ctrl->val) {
+			pm_runtime_mark_last_busy(radio->dev);
+			err = pm_runtime_put_autosuspend(radio->dev);
+			if (err < 0)
+				return err;
+		} else {
+			err = pm_runtime_get_sync(radio->dev);
+			if (err < 0) {
+				pm_runtime_put_noidle(radio->dev);
+				return err;
+			}
+		}
+
+		err = rda5807_set_mute(radio, ctrl->val);
+		if (err)
+			return err;
+
+		radio->unmuted = !ctrl->val;
+		break;
+	case V4L2_CID_AUDIO_VOLUME:
+		return rda5807_set_volume(radio, ctrl->val);
+	case V4L2_CID_TUNE_DEEMPHASIS:
+		return rda5807_set_deemphasis(radio, ctrl->val);
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops rda5807_ctrl_ops = {
+	.s_ctrl = rda5807_s_ctrl,
+};
+
+static int rda5807_vidioc_querycap(struct file *file, void *fh,
+				   struct v4l2_capability *cap)
+{
+	*cap = (struct v4l2_capability) {
+		.driver		= "rda5807",
+		.card		= "RDA5807 FM receiver",
+		.bus_info	= "I2C",
+		.device_caps	= V4L2_CAP_RADIO | V4L2_CAP_TUNER
+						 | V4L2_CAP_HW_FREQ_SEEK,
+	};
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+
+	return 0;
+}
+
+static int rda5807_vidioc_g_audio(struct file *file, void *fh,
+				  struct v4l2_audio *a)
+{
+	if (a->index != 0)
+		return -EINVAL;
+
+	*a = (struct v4l2_audio) {
+		.name = "Radio",
+		.capability = V4L2_AUDCAP_STEREO,
+		.mode = 0,
+	};
+
+	return 0;
+}
+
+static int rda5807_vidioc_g_tuner(struct file *file, void *fh,
+				  struct v4l2_tuner *a)
+{
+	struct rda5807_driver *radio = video_drvdata(file);
+	unsigned int seekres, signal;
+	u32 rxsubchans;
+	int err, active;
+
+	if (a->index != 0)
+		return -EINVAL;
+
+	active = pm_runtime_get_if_in_use(radio->dev);
+	if (active < 0)
+		return active;
+
+	if (active == 0) {
+		signal = 0;
+		rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+	} else {
+		err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &seekres);
+		if (err < 0)
+			goto out_runtime_pm_put;
+
+		if (seekres & RDA5807_SEEKRES_COMPLETE &&
+		    !(seekres & RDA5807_SEEKRES_FAIL))
+			/* mono/stereo known */
+			rxsubchans = seekres & RDA5807_SEEKRES_STEREO
+				? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
+		else
+			/* mono/stereo unknown */
+			rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+
+		err = regmap_read(radio->map, RDA5807_REG_SIGNAL, &signal);
+		if (err < 0)
+			goto out_runtime_pm_put;
+	}
+
+	*a = (struct v4l2_tuner) {
+		.name = "FM",
+		.type = V4L2_TUNER_RADIO,
+		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO,
+		/* unit is 1/16 kHz */
+		.rangelow   = 50000 * 16,
+		.rangehigh  = 108000 * 16,
+		.rxsubchans = rxsubchans,
+		/* TODO: Implement forced mono (RDA5807_CTRL_MONO). */
+		.audmode = V4L2_TUNER_MODE_STEREO,
+		.signal = signal & RDA5807_SIGNAL_RSSI,
+		.afc = 0, /* automatic frequency control */
+	};
+
+	err = 0;
+out_runtime_pm_put:
+	if (active > 0) {
+		pm_runtime_mark_last_busy(radio->dev);
+		pm_runtime_put_autosuspend(radio->dev);
+	}
+	return err;
+}
+
+static int rda5807_vidioc_g_frequency(struct file *file, void *fh,
+				      struct v4l2_frequency *a)
+{
+	struct rda5807_driver *radio = video_drvdata(file);
+	unsigned int val;
+	int err;
+
+	if (a->tuner != 0)
+		return -EINVAL;
+	if (!radio->band)
+		return -EINVAL;
+
+	err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &val);
+	if (err < 0)
+		return err;
+
+	a->frequency = 400 * (val & RDA5807_SEEKRES_READCHAN) + radio->band->rangelow;
+	return 0;
+}
+
+static int rda5807_vidioc_s_frequency(struct file *file, void *fh,
+				      const struct v4l2_frequency *a)
+{
+	struct rda5807_driver *radio = video_drvdata(file);
+	const struct v4l2_frequency_band *band;
+	u16 mask = 0;
+	u16 val = 0;
+	int err, active;
+
+	if (a->tuner != 0)
+		return -EINVAL;
+	if (a->type != V4L2_TUNER_RADIO)
+		return -EINVAL;
+
+	band = rda5807_get_band(a->frequency, a->frequency);
+	if (!band)
+		return -ERANGE;
+
+	dev_dbg(radio->dev, "set freq to %u kHz\n", a->frequency / 16);
+
+	err = rda5807_set_band(radio, band);
+	if (err)
+		return err;
+
+	/* select 25 kHz channel spacing */
+	mask |= RDA5807_CHAN_SPACE;
+	val  |= FIELD_PREP(RDA5807_CHAN_SPACE, 0x3);
+
+	/* select frequency */
+	mask |= RDA5807_CHAN_WRCHAN;
+	val  |= FIELD_PREP(RDA5807_CHAN_WRCHAN, (a->frequency + 200) / 400);
+
+	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN, mask, val);
+	if (err)
+		return err;
+
+	active = pm_runtime_get_if_in_use(radio->dev);
+	if (active <= 0)
+		return active;
+
+	/* start tune operation */
+	err = regmap_write_bits(radio->map, RDA5807_REG_CHAN,
+				RDA5807_CHAN_TUNE, RDA5807_CHAN_TUNE);
+
+	pm_runtime_mark_last_busy(radio->dev);
+	pm_runtime_put_autosuspend(radio->dev);
+
+	return err;
+}
+
+static int rda5807_vidioc_s_hw_freq_seek(struct file *file, void *fh,
+					 const struct v4l2_hw_freq_seek *a)
+{
+	struct rda5807_driver *radio = video_drvdata(file);
+	const struct v4l2_frequency_band *band;
+	unsigned int val = RDA5807_CTRL_SEEK;
+	unsigned int freq, spacing, increment;
+	int err;
+
+	if (a->tuner != 0)
+		return -EINVAL;
+	if (a->type != V4L2_TUNER_RADIO)
+		return -EINVAL;
+
+	switch (a->spacing) {
+	case 25000:
+		spacing = 0x3;
+		break;
+	case 50000:
+		spacing = 0x2;
+		break;
+	case 100000:
+		spacing = 0x0;
+		break;
+	case 200000:
+		spacing = 0x1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	band = rda5807_get_band(a->rangelow, a->rangehigh);
+	if (!band)
+		return -ERANGE;
+
+	err = pm_runtime_get_sync(radio->dev);
+	if (err < 0) {
+		dev_err(radio->dev, "Unable to runtime get: %d\n", err);
+		pm_runtime_put_noidle(radio->dev);
+		return err;
+	}
+
+	/* Configure channel spacing */
+	err = regmap_update_bits(radio->map, RDA5807_REG_CHAN,
+				 RDA5807_CHAN_SPACE,
+				 FIELD_PREP(RDA5807_CHAN_SPACE, spacing));
+	if (err < 0)
+		goto out_runtime_pm_put;
+
+	err = rda5807_set_band(radio, band);
+	if (err < 0)
+		goto out_runtime_pm_put;
+
+	/* seek up or down? */
+	if (a->seek_upward)
+		val |= RDA5807_CTRL_SEEKUP;
+
+	/* wrap around at band limit? */
+	if (!a->wrap_around)
+		val |= RDA5807_CTRL_SKMODE;
+
+	/* Send seek command */
+	err = regmap_update_bits(radio->map, RDA5807_REG_CTRL,
+				 RDA5807_CTRL_SEEKUP |
+				 RDA5807_CTRL_SKMODE |
+				 RDA5807_CTRL_SEEK, val);
+	if (err < 0)
+		goto out_runtime_pm_put;
+
+	increment = a->spacing * 16 / 1000;
+
+	for (freq = a->rangelow; freq <= a->rangehigh; freq += increment) {
+		/*
+		 * The programming guide says we should wait for 35 ms for each
+		 * frequency tested.
+		 */
+		msleep(35);
+
+		err = regmap_read(radio->map, RDA5807_REG_SEEKRES, &val);
+		if (err < 0)
+			goto out_runtime_pm_put;
+
+		/* Seek done? */
+		if (val & RDA5807_SEEKRES_COMPLETE)
+			break;
+	}
+
+	err = regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
+				RDA5807_CTRL_SEEK);
+	if (err)
+		goto out_runtime_pm_put;
+
+	if (freq > a->rangehigh)
+		err = -ETIMEDOUT;
+
+out_runtime_pm_put:
+	pm_runtime_mark_last_busy(radio->dev);
+	pm_runtime_put_autosuspend(radio->dev);
+	return err;
+}
+
+static int rda5807_vidioc_enum_freq_bands(struct file *file, void *priv,
+					  struct v4l2_frequency_band *band)
+{
+	if (band->index >= ARRAY_SIZE(rda5807_bands))
+		return -EINVAL;
+
+	*band = rda5807_bands[band->index];
+	return 0;
+}
+
+static const struct v4l2_ioctl_ops rda5807_ioctl_ops = {
+	.vidioc_querycap	= rda5807_vidioc_querycap,
+	.vidioc_g_audio		= rda5807_vidioc_g_audio,
+	.vidioc_g_tuner		= rda5807_vidioc_g_tuner,
+	.vidioc_g_frequency	= rda5807_vidioc_g_frequency,
+	.vidioc_s_frequency	= rda5807_vidioc_s_frequency,
+	.vidioc_s_hw_freq_seek  = rda5807_vidioc_s_hw_freq_seek,
+	.vidioc_enum_freq_bands	= rda5807_vidioc_enum_freq_bands,
+};
+
+static const u16 rda5807_lna_current[] = { 1800, 2100, 2500, 3000 };
+
+static int rda5807_setup(struct rda5807_driver *radio)
+{
+	struct device *dev = radio->dev;
+	u16 lna = 0, iocfg = 0, ctrl = 0;
+	u32 lna_current = 2500;
+	size_t i;
+	int err;
+
+	/* Configure chip inputs. */
+
+	if (device_property_read_bool(dev, "rda,lnan"))
+		lna |= 0x1;
+	if (device_property_read_bool(dev, "rda,lnap"))
+		lna |= 0x2;
+	if (!lna)
+		dev_warn(dev, "Both LNA inputs disabled\n");
+
+	device_property_read_u32(dev, "rda,lna-microamp", &lna_current);
+	for (i = 0; i < ARRAY_SIZE(rda5807_lna_current); i++)
+		if (rda5807_lna_current[i] == lna_current)
+			break;
+	if (i == ARRAY_SIZE(rda5807_lna_current)) {
+		dev_err(dev, "Invalid LNA current value\n");
+		return -EINVAL;
+	}
+
+	err = regmap_update_bits(radio->map, RDA5807_REG_INPUT,
+				 RDA5807_INPUT_LNA_ICSEL | RDA5807_INPUT_LNA_PORT,
+				 FIELD_PREP(RDA5807_INPUT_LNA_ICSEL, i) |
+				 FIELD_PREP(RDA5807_INPUT_LNA_PORT, lna));
+	if (err)
+		return err;
+
+	/* Configure chip outputs. */
+
+	if (device_property_read_bool(dev, "rda,i2s-out"))
+		iocfg |= RDA5807_IOCFG_I2S_EN;
+
+	if (device_property_read_bool(dev, "rda,analog-out"))
+		ctrl |= RDA5807_CTRL_DHIZ;
+
+	err = regmap_write(radio->map, RDA5807_REG_IOCFG, iocfg);
+	if (err)
+		return err;
+
+	err = regmap_write(radio->map, RDA5807_REG_CTRL, ctrl);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int rda5807_enable_regulator(struct rda5807_driver *radio)
+{
+	int err;
+
+	err = regulator_enable(radio->supply);
+	if (err)
+		return err;
+
+	/* A little sleep is needed before the registers can be accessed */
+	msleep(20);
+
+	return 0;
+}
+
+static const struct v4l2_file_operations rda5807_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl	= video_ioctl2,
+};
+
+static const struct regmap_range rda5807_no_write_ranges[] = {
+	{ RDA5807_REG_CHIPID, RDA5807_REG_CHIPID },
+	{ RDA5807_REG_SEEKRES, RDA5807_REG_SIGNAL },
+};
+
+static const struct regmap_access_table rda5807_write_table = {
+	.no_ranges = rda5807_no_write_ranges,
+	.n_no_ranges = ARRAY_SIZE(rda5807_no_write_ranges),
+};
+
+static const struct regmap_range rda5807_volatile_ranges[] = {
+	{ RDA5807_REG_SEEKRES, RDA5807_REG_SIGNAL },
+};
+
+
+static const struct regmap_access_table rda5807_volatile_table = {
+	.yes_ranges = rda5807_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(rda5807_volatile_ranges),
+};
+
+static const struct reg_default rda5807_reg_defaults[] = {
+	{ RDA5807_REG_CHIPID, 0x5804 },
+	{ RDA5807_REG_CTRL, 0x0 },
+	{ RDA5807_REG_CHAN, 0x4fc0 },
+	{ RDA5807_REG_IOCFG, 0x0400 },
+	{ RDA5807_REG_INPUT, 0x888b },
+	{ RDA5807_REG_BAND, 0x5ec6 },
+};
+
+static const struct regmap_config rda5807_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = RDA5807_REG_SIGNAL,
+
+	.wr_table = &rda5807_write_table,
+	.volatile_table = &rda5807_volatile_table,
+
+	.reg_defaults = rda5807_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(rda5807_reg_defaults),
+
+	.cache_type = REGCACHE_FLAT,
+};
+
+static int rda5807_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct rda5807_driver *radio;
+	unsigned int chipid;
+	int err;
+
+	radio = devm_kzalloc(dev, sizeof(*radio), GFP_KERNEL);
+	if (!radio)
+		return -ENOMEM;
+
+	radio->dev = dev;
+
+	radio->map = devm_regmap_init_i2c(client, &rda5807_regmap_config);
+	if (IS_ERR(radio->map)) {
+		dev_err(dev, "Failed to create regmap\n");
+		return PTR_ERR(radio->map);
+	}
+
+	radio->supply = devm_regulator_get(dev, "power");
+	if (IS_ERR(radio->supply)) {
+		dev_err(dev, "Failed to get power supply\n");
+		return PTR_ERR(radio->supply);
+	}
+
+	err = rda5807_enable_regulator(radio);
+	if (err) {
+		dev_err(dev, "Failed to enable regulator\n");
+		return err;
+	}
+
+	/* Disable the regmap cache temporarily to force reading the chip ID */
+	regcache_cache_bypass(radio->map, true);
+	err = regmap_read(radio->map, RDA5807_REG_CHIPID, &chipid);
+	regcache_cache_bypass(radio->map, false);
+
+	regulator_disable(radio->supply);
+	if (err < 0) {
+		dev_err(dev, "Failed to read chip ID\n");
+		return err;
+	}
+
+	if ((chipid & 0xFF00) != 0x5800) {
+		dev_err(dev, "Chip ID mismatch: expected 58xx, got %04X\n",
+			chipid);
+		return -ENODEV;
+	}
+
+	dev_info(dev, "Found FM radio receiver\n");
+
+	pm_runtime_set_autosuspend_delay(dev, RDA5807_AUTOSUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_suspended(dev);
+	pm_runtime_enable(dev);
+
+	/* Only use regmap cache until the chip is brought up */
+	regcache_cache_only(radio->map, true);
+	regcache_mark_dirty(radio->map);
+
+	err = rda5807_setup(radio);
+	if (err) {
+		dev_err(dev, "Failed to setup registers\n");
+		return err;
+	}
+
+	/* Initialize controls. */
+	v4l2_ctrl_handler_init(&radio->ctrl_handler, 3);
+	v4l2_ctrl_new_std(&radio->ctrl_handler, &rda5807_ctrl_ops,
+			  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+	v4l2_ctrl_new_std(&radio->ctrl_handler, &rda5807_ctrl_ops,
+			  V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 8);
+
+	v4l2_ctrl_new_std_menu(&radio->ctrl_handler, &rda5807_ctrl_ops,
+			       V4L2_CID_TUNE_DEEMPHASIS,
+			       V4L2_DEEMPHASIS_75_uS,
+			       BIT(V4L2_DEEMPHASIS_DISABLED),
+			       V4L2_DEEMPHASIS_50_uS);
+	err = radio->ctrl_handler.error;
+	if (err) {
+		dev_err(dev, "Failed to init controls handler\n");
+		goto err_ctrl_free;
+	}
+
+	err = v4l2_device_register(dev, &radio->v4l2_dev);
+	if (err < 0) {
+		dev_err(dev, "Failed to register v4l2 device\n");
+		goto err_ctrl_free;
+	}
+
+	radio->video_dev = (struct video_device) {
+		.name = "RDA5807 FM receiver",
+		.v4l2_dev = &radio->v4l2_dev,
+		.ctrl_handler = &radio->ctrl_handler,
+		.fops = &rda5807_fops,
+		.ioctl_ops = &rda5807_ioctl_ops,
+		.release = video_device_release_empty,
+		.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER
+					      | V4L2_CAP_HW_FREQ_SEEK,
+	};
+
+	i2c_set_clientdata(client, radio);
+	video_set_drvdata(&radio->video_dev, radio);
+
+	err = v4l2_ctrl_handler_setup(&radio->ctrl_handler);
+	if (err < 0) {
+		dev_err(dev, "Failed to set default control values\n");
+		goto err_video_unreg;
+	}
+
+	err = video_register_device(&radio->video_dev, VFL_TYPE_RADIO, -1);
+	if (err < 0) {
+		dev_err(dev, "Failed to register video device\n");
+		goto err_ctrl_free;
+	}
+
+	return 0;
+
+err_video_unreg:
+	video_unregister_device(&radio->video_dev);
+err_ctrl_free:
+	v4l2_ctrl_handler_free(&radio->ctrl_handler);
+	video_device_release_empty(&radio->video_dev);
+
+	return err;
+}
+
+static int rda5807_i2c_remove(struct i2c_client *client)
+{
+	struct rda5807_driver *radio = i2c_get_clientdata(client);
+	struct device *dev = &client->dev;
+
+	pm_runtime_disable(dev);
+	pm_runtime_force_suspend(dev);
+	pm_runtime_dont_use_autosuspend(dev);
+
+	video_unregister_device(&radio->video_dev);
+	v4l2_ctrl_handler_free(&radio->ctrl_handler);
+	video_device_release_empty(&radio->video_dev);
+
+	return 0;
+}
+
+static int rda5807_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rda5807_driver *radio = i2c_get_clientdata(client);
+	int err;
+
+	err = regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
+				RDA5807_CTRL_ENABLE);
+	if (err)
+		return err;
+
+	regcache_cache_only(radio->map, true);
+	regcache_mark_dirty(radio->map);
+
+	err = regulator_disable(radio->supply);
+	if (err)
+		return err;
+
+	dev_dbg(radio->dev, "Disabled\n");
+
+	return 0;
+}
+
+static int rda5807_reset_chip(struct rda5807_driver *radio)
+{
+	int err;
+
+	err = regmap_write_bits(radio->map, RDA5807_REG_CTRL,
+				RDA5807_CTRL_SOFTRESET, RDA5807_CTRL_SOFTRESET);
+	if (err)
+		return err;
+
+	usleep_range(1000, 10000);
+
+	return regmap_write_bits(radio->map, RDA5807_REG_CTRL,
+				 RDA5807_CTRL_SOFTRESET, 0);
+}
+
+static int rda5807_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rda5807_driver *radio = i2c_get_clientdata(client);
+	int err;
+
+	err = rda5807_enable_regulator(radio);
+	if (err)
+		return err;
+
+	regcache_cache_only(radio->map, false);
+
+	err = rda5807_reset_chip(radio);
+	if (err)
+		return err;
+
+	/* Restore cached registers to hardware */
+	err = regcache_sync(radio->map);
+	if (err) {
+		dev_err(dev, "Failed to restore regs: %d\n", err);
+		goto err_regulator_disable;
+	}
+
+	err = regmap_set_bits(radio->map, RDA5807_REG_CTRL,
+			      RDA5807_CTRL_ENABLE);
+	if (err) {
+		dev_err(dev, "Failed to enable radio: %d\n", err);
+		goto err_regulator_disable;
+	}
+
+	err = regmap_write_bits(radio->map, RDA5807_REG_CHAN,
+				RDA5807_CHAN_TUNE, RDA5807_CHAN_TUNE);
+	if (err) {
+		dev_err(dev, "Failed to tune radio: %d\n", err);
+		goto err_radio_disable;
+	}
+
+	dev_dbg(radio->dev, "Enabled\n");
+
+	return 0;
+
+err_radio_disable:
+	regmap_clear_bits(radio->map, RDA5807_REG_CTRL,
+			  RDA5807_CTRL_ENABLE);
+err_regulator_disable:
+	regulator_disable(radio->supply);
+	return err;
+}
+
+static UNIVERSAL_DEV_PM_OPS(rda5807_pm_ops, rda5807_suspend, rda5807_resume, NULL);
+
+static const struct of_device_id rda5807_dt_ids[] = {
+	{ .compatible = "rda,rda5807" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, rda5807_dt_ids);
+
+static const struct i2c_device_id rda5807_id[] = {
+	{ "rda5807", 0 },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i2c, rda5807_id);
+
+static struct i2c_driver rda5807_i2c_driver = {
+	.driver = {
+		.name = "radio-rda5807",
+		.of_match_table = of_match_ptr(rda5807_dt_ids),
+		.pm = &rda5807_pm_ops,
+	},
+	.probe = rda5807_i2c_probe,
+	.remove = rda5807_i2c_remove,
+	.id_table = rda5807_id,
+};
+module_i2c_driver(rda5807_i2c_driver);
+
+MODULE_AUTHOR("Maarten ter Huurne <[e-mail]>");
+MODULE_AUTHOR("Paul Cercueil <[e-mail]>");
+MODULE_DESCRIPTION("RDA5807 FM tuner driver");
+MODULE_LICENSE("GPL");