Message-ID: <5586C6EE.1090500@kernel.org>
Date:	Sun, 21 Jun 2015 15:15:10 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Daniel Baluta <daniel.baluta@...el.com>
CC:	pmeerw@...erw.net, knaack.h@....de, lars@...afoo.de,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v4] iio: light: Add support for ROHM RPR0521 sensor

On 17/06/15 10:42, Daniel Baluta wrote:
> This patch adds support for ROHM RPR0521 ambient light and proximity
> sensor. It offers raw readings for intensity and proximity.
> 
> Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
Looks good to me.

Applied to the togreg branch of iio.git - initially pushed out as
testing for the autobuilders to play with it.


> ---
> Changes since v3:
> 	* use GENMASK instead BIT(x) | BIT(y)
> 	* remove (now) unused RPR0521_PXS_MAX_VAL because of PXS ABI
> 	  clarification
> 	* remove get_gain_index function and directly code finding the index.
> 
> Other stuff:
> 	* I preffered to keep the remgap implementation because it does look
> 	  more clean to me. Also, it does have a nice feature of exporting
> 	  registers for debug.
If this reply is in response to my comments, I was always in favour of regmap!
Just suggested (IIRC) that you might want to take it futher and use the
support that regmap has for bit fields (hardly used anywhere currently) as it
makes some of the shift and mask stuff a litle tiddier.
> 	* didn't roll reg_desc and gain_info structure because the separation
> 	  looked easier to understand.
Fair enough!
> 
>  drivers/iio/light/Kconfig   |  11 +
>  drivers/iio/light/Makefile  |   1 +
>  drivers/iio/light/rpr0521.c | 615 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 627 insertions(+)
>  create mode 100644 drivers/iio/light/rpr0521.c
> 
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index e6198b7..cbc4677 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -168,6 +168,17 @@ config JSA1212
>  	 To compile this driver as a module, choose M here:
>  	 the module will be called jsa1212.
>  
> +config RPR0521
> +	tristate "ROHM RPR0521 ALS and proximity sensor driver"
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	 Say Y here if you want to build support for ROHM's RPR0521
> +	 ambient light and proximity sensor device.
> +
> +	 To compile this driver as a module, choose M here:
> +	 the module will be called rpr0521.
> +
>  config SENSORS_LM3533
>  	tristate "LM3533 ambient light sensor"
>  	depends on MFD_LM3533
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index e2d50fd..adf9723 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_ISL29125)		+= isl29125.o
>  obj-$(CONFIG_JSA1212)		+= jsa1212.o
>  obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>  obj-$(CONFIG_LTR501)		+= ltr501.o
> +obj-$(CONFIG_RPR0521)		+= rpr0521.o
>  obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
>  obj-$(CONFIG_STK3310)          += stk3310.o
>  obj-$(CONFIG_TCS3414)		+= tcs3414.o
> diff --git a/drivers/iio/light/rpr0521.c b/drivers/iio/light/rpr0521.c
> new file mode 100644
> index 0000000..4b75bb0
> --- /dev/null
> +++ b/drivers/iio/light/rpr0521.c
> @@ -0,0 +1,615 @@
> +/*
> + * RPR-0521 ROHM Ambient Light and Proximity Sensor
> + *
> + * Copyright (c) 2015, Intel Corporation.
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License.  See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
> + *
> + * TODO: illuminance channel, PM support, buffer
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/delay.h>
> +#include <linux/acpi.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/pm_runtime.h>
> +
> +#define RPR0521_REG_SYSTEM_CTRL		0x40
> +#define RPR0521_REG_MODE_CTRL		0x41
> +#define RPR0521_REG_ALS_CTRL		0x42
> +#define RPR0521_REG_PXS_CTRL		0x43
> +#define RPR0521_REG_PXS_DATA		0x44 /* 16-bit, little endian */
> +#define RPR0521_REG_ALS_DATA0		0x46 /* 16-bit, little endian */
> +#define RPR0521_REG_ALS_DATA1		0x48 /* 16-bit, little endian */
> +#define RPR0521_REG_ID			0x92
> +
> +#define RPR0521_MODE_ALS_MASK		BIT(7)
> +#define RPR0521_MODE_PXS_MASK		BIT(6)
> +#define RPR0521_MODE_MEAS_TIME_MASK	GENMASK(3, 0)
> +#define RPR0521_ALS_DATA0_GAIN_MASK	GENMASK(5, 4)
> +#define RPR0521_ALS_DATA0_GAIN_SHIFT	4
> +#define RPR0521_ALS_DATA1_GAIN_MASK	GENMASK(3, 2)
> +#define RPR0521_ALS_DATA1_GAIN_SHIFT	2
> +#define RPR0521_PXS_GAIN_MASK		GENMASK(5, 4)
> +#define RPR0521_PXS_GAIN_SHIFT		4
> +
> +#define RPR0521_MODE_ALS_ENABLE		BIT(7)
> +#define RPR0521_MODE_ALS_DISABLE	0x00
> +#define RPR0521_MODE_PXS_ENABLE		BIT(6)
> +#define RPR0521_MODE_PXS_DISABLE	0x00
> +
> +#define RPR0521_MANUFACT_ID		0xE0
> +#define RPR0521_DEFAULT_MEAS_TIME	0x06 /* ALS - 100ms, PXS - 100ms */
> +
> +#define RPR0521_DRV_NAME		"RPR0521"
> +#define RPR0521_REGMAP_NAME		"rpr0521_regmap"
> +
> +#define RPR0521_SLEEP_DELAY_MS	2000
> +
> +#define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
> +#define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
> +
> +struct rpr0521_gain {
> +	int scale;
> +	int uscale;
> +};
> +
> +static const struct rpr0521_gain rpr0521_als_gain[4] = {
> +	{1, 0},		/* x1 */
> +	{0, 500000},	/* x2 */
> +	{0, 15625},	/* x64 */
> +	{0, 7812},	/* x128 */
> +};
> +
> +static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
> +	{1, 0},		/* x1 */
> +	{0, 500000},	/* x2 */
> +	{0, 125000},	/* x4 */
> +};
> +
> +enum rpr0521_channel {
> +	RPR0521_CHAN_ALS_DATA0,
> +	RPR0521_CHAN_ALS_DATA1,
> +	RPR0521_CHAN_PXS,
> +};
> +
> +struct rpr0521_reg_desc {
> +	u8 address;
> +	u8 device_mask;
> +};
> +
> +static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
> +	[RPR0521_CHAN_ALS_DATA0] = {
> +		.address	= RPR0521_REG_ALS_DATA0,
> +		.device_mask	= RPR0521_MODE_ALS_MASK,
> +	},
> +	[RPR0521_CHAN_ALS_DATA1] = {
> +		.address	= RPR0521_REG_ALS_DATA1,
> +		.device_mask	= RPR0521_MODE_ALS_MASK,
> +	},
> +	[RPR0521_CHAN_PXS]	= {
> +		.address	= RPR0521_REG_PXS_DATA,
> +		.device_mask	= RPR0521_MODE_PXS_MASK,
> +	},
> +};
> +
> +static const struct rpr0521_gain_info {
> +	u8 reg;
> +	u8 mask;
> +	u8 shift;
> +	const struct rpr0521_gain *gain;
> +	int size;
> +} rpr0521_gain[] = {
> +	[RPR0521_CHAN_ALS_DATA0] = {
> +		.reg	= RPR0521_REG_ALS_CTRL,
> +		.mask	= RPR0521_ALS_DATA0_GAIN_MASK,
> +		.shift	= RPR0521_ALS_DATA0_GAIN_SHIFT,
> +		.gain	= rpr0521_als_gain,
> +		.size	= ARRAY_SIZE(rpr0521_als_gain),
> +	},
> +	[RPR0521_CHAN_ALS_DATA1] = {
> +		.reg	= RPR0521_REG_ALS_CTRL,
> +		.mask	= RPR0521_ALS_DATA1_GAIN_MASK,
> +		.shift	= RPR0521_ALS_DATA1_GAIN_SHIFT,
> +		.gain	= rpr0521_als_gain,
> +		.size	= ARRAY_SIZE(rpr0521_als_gain),
> +	},
> +	[RPR0521_CHAN_PXS] = {
> +		.reg	= RPR0521_REG_PXS_CTRL,
> +		.mask	= RPR0521_PXS_GAIN_MASK,
> +		.shift	= RPR0521_PXS_GAIN_SHIFT,
> +		.gain	= rpr0521_pxs_gain,
> +		.size	= ARRAY_SIZE(rpr0521_pxs_gain),
> +	},
> +};
> +
> +struct rpr0521_data {
> +	struct i2c_client *client;
> +
> +	/* protect device params updates (e.g state, gain) */
> +	struct mutex lock;
> +
> +	/* device active status */
> +	bool als_dev_en;
> +	bool pxs_dev_en;
> +
> +	/* optimize runtime pm ops - enable device only if needed */
> +	bool als_ps_need_en;
> +	bool pxs_ps_need_en;
> +
> +	struct regmap *regmap;
> +};
> +
> +static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
> +static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
> +
> +static struct attribute *rpr0521_attributes[] = {
> +	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
> +	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group rpr0521_attribute_group = {
> +	.attrs = rpr0521_attributes,
> +};
> +
> +static const struct iio_chan_spec rpr0521_channels[] = {
> +	{
> +		.type = IIO_INTENSITY,
> +		.modified = 1,
> +		.address = RPR0521_CHAN_ALS_DATA0,
> +		.channel2 = IIO_MOD_LIGHT_BOTH,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	},
> +	{
> +		.type = IIO_INTENSITY,
> +		.modified = 1,
> +		.address = RPR0521_CHAN_ALS_DATA1,
> +		.channel2 = IIO_MOD_LIGHT_IR,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	},
> +	{
> +		.type = IIO_PROXIMITY,
> +		.address = RPR0521_CHAN_PXS,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	}
> +};
> +
> +static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
> +				 RPR0521_MODE_ALS_MASK,
> +				 status);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->als_dev_en = true;
> +
> +	return 0;
> +}
> +
> +static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
> +				 RPR0521_MODE_PXS_MASK,
> +				 status);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->pxs_dev_en = true;
> +
> +	return 0;
> +}
> +
> +/**
> + * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
> + *
> + * @data: rpr0521 device private data
> + * @on: state to be set for devices in @device_mask
> + * @device_mask: bitmask specifying for which device we need to update @on state
> + *
> + * We rely on rpr0521_runtime_resume to enable our @device_mask devices, but
> + * if (for example) PXS was enabled (pxs_dev_en = true) by a previous call to
> + * rpr0521_runtime_resume and we want to enable ALS we MUST set ALS enable
> + * bit of RPR0521_REG_MODE_CTRL here because rpr0521_runtime_resume will not
> + * be called twice.
> + */
> +static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
> +				   u8 device_mask)
> +{
> +#ifdef CONFIG_PM
> +	int ret;
> +	u8 update_mask = 0;
> +
> +	if (device_mask & RPR0521_MODE_ALS_MASK) {
> +		if (on && !data->als_ps_need_en && data->pxs_dev_en)
> +			update_mask |= RPR0521_MODE_ALS_MASK;
> +		else
> +			data->als_ps_need_en = on;
> +	}
> +
> +	if (device_mask & RPR0521_MODE_PXS_MASK) {
> +		if (on && !data->pxs_ps_need_en && data->als_dev_en)
> +			update_mask |= RPR0521_MODE_PXS_MASK;
> +		else
> +			data->pxs_ps_need_en = on;
> +	}
> +
> +	if (update_mask) {
> +		ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
> +					 update_mask, update_mask);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	if (on) {
> +		ret = pm_runtime_get_sync(&data->client->dev);
> +	} else {
> +		pm_runtime_mark_last_busy(&data->client->dev);
> +		ret = pm_runtime_put_autosuspend(&data->client->dev);
> +	}
> +	if (ret < 0) {
> +		dev_err(&data->client->dev,
> +			"Failed: rpr0521_set_power_state for %d, ret %d\n",
> +			on, ret);
> +		if (on)
> +			pm_runtime_put_noidle(&data->client->dev);
> +
> +		return ret;
> +	}
> +#endif
> +	return 0;
> +}
> +
> +static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
> +			    int *val, int *val2)
> +{
> +	int ret, reg, idx;
> +
> +	ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, &reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
> +	*val = rpr0521_gain[chan].gain[idx].scale;
> +	*val2 = rpr0521_gain[chan].gain[idx].uscale;
> +
> +	return 0;
> +}
> +
> +static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
> +			    int val, int val2)
> +{
> +	int i, idx = -EINVAL;
> +
> +	/* get gain index */
> +	for (i = 0; i < rpr0521_gain[chan].size; i++)
> +		if (val == rpr0521_gain[chan].gain[i].scale &&
> +		    val2 == rpr0521_gain[chan].gain[i].uscale) {
> +			idx = i;
> +			break;
> +		}
> +
> +	if (idx < 0)
> +		return idx;
> +
> +	return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
> +				  rpr0521_gain[chan].mask,
> +				  idx << rpr0521_gain[chan].shift);
> +}
> +
> +static int rpr0521_read_raw(struct iio_dev *indio_dev,
> +			    struct iio_chan_spec const *chan, int *val,
> +			    int *val2, long mask)
> +{
> +	struct rpr0521_data *data = iio_priv(indio_dev);
> +	int ret;
> +	u8 device_mask;
> +	__le16 raw_data;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
> +			return -EINVAL;
> +
> +		device_mask = rpr0521_data_reg[chan->address].device_mask;
> +
> +		mutex_lock(&data->lock);
> +		ret = rpr0521_set_power_state(data, true, device_mask);
> +		if (ret < 0) {
> +			mutex_unlock(&data->lock);
> +			return ret;
> +		}
> +
> +		ret = regmap_bulk_read(data->regmap,
> +				       rpr0521_data_reg[chan->address].address,
> +				       &raw_data, 2);
> +		if (ret < 0) {
> +			rpr0521_set_power_state(data, false, device_mask);
> +			mutex_unlock(&data->lock);
> +			return ret;
> +		}
> +
> +		ret = rpr0521_set_power_state(data, false, device_mask);
> +		mutex_unlock(&data->lock);
> +		if (ret < 0)
> +			return ret;
> +
> +		*val = le16_to_cpu(raw_data);
> +
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_SCALE:
> +		mutex_lock(&data->lock);
> +		ret = rpr0521_get_gain(data, chan->address, val, val2);
> +		mutex_unlock(&data->lock);
> +		if (ret < 0)
> +			return ret;
> +
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int rpr0521_write_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan, int val,
> +			     int val2, long mask)
> +{
> +	struct rpr0521_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		mutex_lock(&data->lock);
> +		ret = rpr0521_set_gain(data, chan->address, val, val2);
> +		mutex_unlock(&data->lock);
> +
> +		return ret;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct iio_info rpr0521_info = {
> +	.driver_module	= THIS_MODULE,
> +	.read_raw	= rpr0521_read_raw,
> +	.write_raw	= rpr0521_write_raw,
> +	.attrs		= &rpr0521_attribute_group,
> +};
> +
> +static int rpr0521_init(struct rpr0521_data *data)
> +{
> +	int ret;
> +	int id;
> +
> +	ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "Failed to read REG_ID register\n");
> +		return ret;
> +	}
> +
> +	if (id != RPR0521_MANUFACT_ID) {
> +		dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
> +			id, RPR0521_MANUFACT_ID);
> +		return -ENODEV;
> +	}
> +
> +	/* set default measurement time - 100 ms for both ALS and PS */
> +	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
> +				 RPR0521_MODE_MEAS_TIME_MASK,
> +				 RPR0521_DEFAULT_MEAS_TIME);
> +	if (ret) {
> +		pr_err("regmap_update_bits returned %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +	ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int rpr0521_poweroff(struct rpr0521_data *data)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
> +				 RPR0521_MODE_ALS_MASK |
> +				 RPR0521_MODE_PXS_MASK,
> +				 RPR0521_MODE_ALS_DISABLE |
> +				 RPR0521_MODE_PXS_DISABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->als_dev_en = false;
> +	data->pxs_dev_en = false;
> +
> +	return 0;
> +}
> +
> +static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case RPR0521_REG_MODE_CTRL:
> +	case RPR0521_REG_ALS_CTRL:
> +	case RPR0521_REG_PXS_CTRL:
> +		return false;
> +	default:
> +		return true;
> +	}
> +}
> +
> +static const struct regmap_config rpr0521_regmap_config = {
> +	.name		= RPR0521_REGMAP_NAME,
> +
> +	.reg_bits	= 8,
> +	.val_bits	= 8,
> +
> +	.max_register	= RPR0521_REG_ID,
> +	.cache_type	= REGCACHE_RBTREE,
> +	.volatile_reg	= rpr0521_is_volatile_reg,
> +};
> +
> +static int rpr0521_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct rpr0521_data *data;
> +	struct iio_dev *indio_dev;
> +	struct regmap *regmap;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&client->dev, "regmap_init failed!\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	data = iio_priv(indio_dev);
> +	i2c_set_clientdata(client, indio_dev);
> +	data->client = client;
> +	data->regmap = regmap;
> +
> +	mutex_init(&data->lock);
> +
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->info = &rpr0521_info;
> +	indio_dev->name = RPR0521_DRV_NAME;
> +	indio_dev->channels = rpr0521_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	ret = rpr0521_init(data);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "rpr0521 chip init failed\n");
> +		return ret;
> +	}
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = pm_runtime_set_active(&client->dev);
> +	if (ret < 0)
> +		goto err_iio_unregister;
> +
> +	pm_runtime_enable(&client->dev);
> +	pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
> +	pm_runtime_use_autosuspend(&client->dev);
> +
> +	return 0;
> +
> +err_iio_unregister:
> +	iio_device_unregister(indio_dev);
> +	return ret;
> +}
> +
> +static int rpr0521_remove(struct i2c_client *client)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +
> +	pm_runtime_disable(&client->dev);
> +	pm_runtime_set_suspended(&client->dev);
> +	pm_runtime_put_noidle(&client->dev);
> +
> +	iio_device_unregister(indio_dev);
> +	rpr0521_poweroff(iio_priv(indio_dev));
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int rpr0521_runtime_suspend(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> +	struct rpr0521_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	/* disable channels and sets {als,pxs}_dev_en to false */
> +	mutex_lock(&data->lock);
> +	ret = rpr0521_poweroff(data);
> +	mutex_unlock(&data->lock);
> +
> +	return ret;
> +}
> +
> +static int rpr0521_runtime_resume(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> +	struct rpr0521_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	if (data->als_ps_need_en) {
> +		ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
> +		if (ret < 0)
> +			return ret;
> +		data->als_ps_need_en = false;
> +	}
> +
> +	if (data->pxs_ps_need_en) {
> +		ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
> +		if (ret < 0)
> +			return ret;
> +		data->pxs_ps_need_en = false;
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops rpr0521_pm_ops = {
> +	SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend,
> +			   rpr0521_runtime_resume, NULL)
> +};
> +
> +static const struct acpi_device_id rpr0521_acpi_match[] = {
> +	{"RPR0521", 0},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
> +
> +static const struct i2c_device_id rpr0521_id[] = {
> +	{"rpr0521", 0},
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, rpr0521_id);
> +
> +static struct i2c_driver rpr0521_driver = {
> +	.driver = {
> +		.name	= RPR0521_DRV_NAME,
> +		.pm	= &rpr0521_pm_ops,
> +		.acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
> +	},
> +	.probe		= rpr0521_probe,
> +	.remove		= rpr0521_remove,
> +	.id_table	= rpr0521_id,
> +};
> +
> +module_i2c_driver(rpr0521_driver);
> +
> +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@...el.com>");
> +MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
> +MODULE_LICENSE("GPL v2");
> 

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