iio: light: Add support for ROHM RPR0521 sensor (efa86e9f) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/iio/light/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/iio/light/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/iio/light/rpr0521.c

0 → 100644

+615 −0

Original line number	Diff line number	Diff line
		/*
		* 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@intel.com>");
		MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
		MODULE_LICENSE("GPL v2");