drivers/iio/light/noa1305.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Support for ON Semiconductor NOA1305 ambient light sensor
  *
  * Copyright (C) 2016 Emcraft Systems
  * Copyright (C) 2019 Collabora Ltd.
  */

 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>

 #define NOA1305_REG_POWER_CONTROL	0x0
 #define   NOA1305_POWER_CONTROL_DOWN	0x00
 #define   NOA1305_POWER_CONTROL_ON	0x08
 #define NOA1305_REG_RESET		0x1
 #define   NOA1305_RESET_RESET		0x10
 #define NOA1305_REG_INTEGRATION_TIME	0x2
 #define   NOA1305_INTEGR_TIME_800MS	0x00
 #define   NOA1305_INTEGR_TIME_400MS	0x01
 #define   NOA1305_INTEGR_TIME_200MS	0x02
 #define   NOA1305_INTEGR_TIME_100MS	0x03
 #define   NOA1305_INTEGR_TIME_50MS	0x04
 #define   NOA1305_INTEGR_TIME_25MS	0x05
 #define   NOA1305_INTEGR_TIME_12_5MS	0x06
 #define   NOA1305_INTEGR_TIME_6_25MS	0x07
 #define NOA1305_REG_INT_SELECT		0x3
 #define   NOA1305_INT_SEL_ACTIVE_HIGH	0x01
 #define   NOA1305_INT_SEL_ACTIVE_LOW	0x02
 #define   NOA1305_INT_SEL_INACTIVE	0x03
 #define NOA1305_REG_INT_THRESH_LSB	0x4
 #define NOA1305_REG_INT_THRESH_MSB	0x5
 #define NOA1305_REG_ALS_DATA_LSB	0x6
 #define NOA1305_REG_ALS_DATA_MSB	0x7
 #define NOA1305_REG_DEVICE_ID_LSB	0x8
 #define NOA1305_REG_DEVICE_ID_MSB	0x9

 #define NOA1305_DEVICE_ID	0x0519
 #define NOA1305_DRIVER_NAME	"noa1305"

 struct noa1305_priv {
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct regulator *vin_reg;
 };

 static int noa1305_measure(struct noa1305_priv *priv)
 {
 	__le16 data;
 	int ret;

 	ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
 			       2);
 	if (ret < 0)
 		return ret;

 	return le16_to_cpu(data);
 }

 static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
 {
 	int data;
 	int ret;

 	ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
 	if (ret < 0)
 		return ret;

 	/*
 	 * Lux = count / (<Integration Constant> * <Integration Time>)
 	 *
 	 * Integration Constant = 7.7
 	 * Integration Time in Seconds
 	 */
 	switch (data) {
 	case NOA1305_INTEGR_TIME_800MS:
 		*val = 100;
 		*val2 = 77 * 8;
 		break;
 	case NOA1305_INTEGR_TIME_400MS:
 		*val = 100;
 		*val2 = 77 * 4;
 		break;
 	case NOA1305_INTEGR_TIME_200MS:
 		*val = 100;
 		*val2 = 77 * 2;
 		break;
 	case NOA1305_INTEGR_TIME_100MS:
 		*val = 100;
 		*val2 = 77;
 		break;
 	case NOA1305_INTEGR_TIME_50MS:
 		*val = 1000;
 		*val2 = 77 * 5;
 		break;
 	case NOA1305_INTEGR_TIME_25MS:
 		*val = 10000;
 		*val2 = 77 * 25;
 		break;
 	case NOA1305_INTEGR_TIME_12_5MS:
 		*val = 100000;
 		*val2 = 77 * 125;
 		break;
 	case NOA1305_INTEGR_TIME_6_25MS:
 		*val = 1000000;
 		*val2 = 77 * 625;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return IIO_VAL_FRACTIONAL;
 }

 static const struct iio_chan_spec noa1305_channels[] = {
 	{
 		.type = IIO_LIGHT,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
 	}
 };

 static int noa1305_read_raw(struct iio_dev *indio_dev,
 				struct iio_chan_spec const *chan,
 				int *val, int *val2, long mask)
 {
 	int ret = -EINVAL;
 	struct noa1305_priv *priv = iio_priv(indio_dev);

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		switch (chan->type) {
 		case IIO_LIGHT:
 			ret = noa1305_measure(priv);
 			if (ret < 0)
 				return ret;
 			*val = ret;
 			return IIO_VAL_INT;
 		default:
 			break;
 		}
 		break;
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->type) {
 		case IIO_LIGHT:
 			return noa1305_scale(priv, val, val2);
 		default:
 			break;
 		}
 		break;
 	default:
 		break;
 	}

 	return ret;
 }

 static const struct iio_info noa1305_info = {
 	.read_raw = noa1305_read_raw,
 };

 static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case NOA1305_REG_POWER_CONTROL:
 	case NOA1305_REG_RESET:
 	case NOA1305_REG_INTEGRATION_TIME:
 	case NOA1305_REG_INT_SELECT:
 	case NOA1305_REG_INT_THRESH_LSB:
 	case NOA1305_REG_INT_THRESH_MSB:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct regmap_config noa1305_regmap_config = {
 	.name = NOA1305_DRIVER_NAME,
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = NOA1305_REG_DEVICE_ID_MSB,
 	.writeable_reg = noa1305_writable_reg,
 };

 static void noa1305_reg_remove(void *data)
 {
 	struct noa1305_priv *priv = data;

 	regulator_disable(priv->vin_reg);
 }

 static int noa1305_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct noa1305_priv *priv;
 	struct iio_dev *indio_dev;
 	struct regmap *regmap;
 	__le16 data;
 	unsigned int dev_id;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
 	if (!indio_dev)
 		return -ENOMEM;

 	regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
 	if (IS_ERR(regmap)) {
 		dev_err(&client->dev, "Regmap initialization failed.\n");
 		return PTR_ERR(regmap);
 	}

 	priv = iio_priv(indio_dev);

 	priv->vin_reg = devm_regulator_get(&client->dev, "vin");
 	if (IS_ERR(priv->vin_reg)) {
 		dev_err(&client->dev, "get regulator vin failed\n");
 		return PTR_ERR(priv->vin_reg);
 	}

 	ret = regulator_enable(priv->vin_reg);
 	if (ret) {
 		dev_err(&client->dev, "enable regulator vin failed\n");
 		return ret;
 	}

 	ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv);
 	if (ret) {
 		dev_err(&client->dev, "addition of devm action failed\n");
 		return ret;
 	}

 	i2c_set_clientdata(client, indio_dev);
 	priv->client = client;
 	priv->regmap = regmap;

 	ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
 	if (ret < 0) {
 		dev_err(&client->dev, "ID reading failed: %d\n", ret);
 		return ret;
 	}

 	dev_id = le16_to_cpu(data);
 	if (dev_id != NOA1305_DEVICE_ID) {
 		dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
 		return -ENODEV;
 	}

 	ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
 			   NOA1305_POWER_CONTROL_ON);
 	if (ret < 0) {
 		dev_err(&client->dev, "Enabling power control failed\n");
 		return ret;
 	}

 	ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
 	if (ret < 0) {
 		dev_err(&client->dev, "Device reset failed\n");
 		return ret;
 	}

 	ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
 			   NOA1305_INTEGR_TIME_800MS);
 	if (ret < 0) {
 		dev_err(&client->dev, "Setting integration time failed\n");
 		return ret;
 	}

 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &noa1305_info;
 	indio_dev->channels = noa1305_channels;
 	indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
 	indio_dev->name = NOA1305_DRIVER_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = devm_iio_device_register(&client->dev, indio_dev);
 	if (ret)
 		dev_err(&client->dev, "registering device failed\n");

 	return ret;
 }

 static const struct of_device_id noa1305_of_match[] = {
 	{ .compatible = "onnn,noa1305" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, noa1305_of_match);

 static const struct i2c_device_id noa1305_ids[] = {
 	{ "noa1305", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, noa1305_ids);

 static struct i2c_driver noa1305_driver = {
 	.driver = {
 		.name		= NOA1305_DRIVER_NAME,
 		.of_match_table	= noa1305_of_match,
 	},
 	.probe		= noa1305_probe,
 	.id_table	= noa1305_ids,
 };

 module_i2c_driver(noa1305_driver);

 MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
 MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
 MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Support for ON Semiconductor NOA1305 ambient light sensor
	*
	* Copyright (C) 2016 Emcraft Systems
	* Copyright (C) 2019 Collabora Ltd.
	*/

	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/regulator/consumer.h>

	#define NOA1305_REG_POWER_CONTROL 0x0
	#define NOA1305_POWER_CONTROL_DOWN 0x00
	#define NOA1305_POWER_CONTROL_ON 0x08
	#define NOA1305_REG_RESET 0x1
	#define NOA1305_RESET_RESET 0x10
	#define NOA1305_REG_INTEGRATION_TIME 0x2
	#define NOA1305_INTEGR_TIME_800MS 0x00
	#define NOA1305_INTEGR_TIME_400MS 0x01
	#define NOA1305_INTEGR_TIME_200MS 0x02
	#define NOA1305_INTEGR_TIME_100MS 0x03
	#define NOA1305_INTEGR_TIME_50MS 0x04
	#define NOA1305_INTEGR_TIME_25MS 0x05
	#define NOA1305_INTEGR_TIME_12_5MS 0x06
	#define NOA1305_INTEGR_TIME_6_25MS 0x07
	#define NOA1305_REG_INT_SELECT 0x3
	#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
	#define NOA1305_INT_SEL_ACTIVE_LOW 0x02
	#define NOA1305_INT_SEL_INACTIVE 0x03
	#define NOA1305_REG_INT_THRESH_LSB 0x4
	#define NOA1305_REG_INT_THRESH_MSB 0x5
	#define NOA1305_REG_ALS_DATA_LSB 0x6
	#define NOA1305_REG_ALS_DATA_MSB 0x7
	#define NOA1305_REG_DEVICE_ID_LSB 0x8
	#define NOA1305_REG_DEVICE_ID_MSB 0x9

	#define NOA1305_DEVICE_ID 0x0519
	#define NOA1305_DRIVER_NAME "noa1305"

	struct noa1305_priv {
	struct i2c_client *client;
	struct regmap *regmap;
	struct regulator *vin_reg;
	};

	static int noa1305_measure(struct noa1305_priv *priv)
	{
	__le16 data;
	int ret;

	ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
	2);
	if (ret < 0)
	return ret;

	return le16_to_cpu(data);
	}

	static int noa1305_scale(struct noa1305_priv priv, int val, int *val2)
	{
	int data;
	int ret;

	ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
	if (ret < 0)
	return ret;

	/*
	* Lux = count / (<Integration Constant> * <Integration Time>)
	*
	* Integration Constant = 7.7
	* Integration Time in Seconds
	*/
	switch (data) {
	case NOA1305_INTEGR_TIME_800MS:
	*val = 100;
	val2 = 77 8;
	break;
	case NOA1305_INTEGR_TIME_400MS:
	*val = 100;
	val2 = 77 4;
	break;
	case NOA1305_INTEGR_TIME_200MS:
	*val = 100;
	val2 = 77 2;
	break;
	case NOA1305_INTEGR_TIME_100MS:
	*val = 100;
	*val2 = 77;
	break;
	case NOA1305_INTEGR_TIME_50MS:
	*val = 1000;
	val2 = 77 5;
	break;
	case NOA1305_INTEGR_TIME_25MS:
	*val = 10000;
	val2 = 77 25;
	break;
	case NOA1305_INTEGR_TIME_12_5MS:
	*val = 100000;
	val2 = 77 125;
	break;
	case NOA1305_INTEGR_TIME_6_25MS:
	*val = 1000000;
	val2 = 77 625;
	break;
	default:
	return -EINVAL;
	}

	return IIO_VAL_FRACTIONAL;
	}

	static const struct iio_chan_spec noa1305_channels[] = {
	{
	.type = IIO_LIGHT,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	}
	};

	static int noa1305_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	int ret = -EINVAL;
	struct noa1305_priv *priv = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	switch (chan->type) {
	case IIO_LIGHT:
	ret = noa1305_measure(priv);
	if (ret < 0)
	return ret;
	*val = ret;
	return IIO_VAL_INT;
	default:
	break;
	}
	break;
	case IIO_CHAN_INFO_SCALE:
	switch (chan->type) {
	case IIO_LIGHT:
	return noa1305_scale(priv, val, val2);
	default:
	break;
	}
	break;
	default:
	break;
	}

	return ret;
	}

	static const struct iio_info noa1305_info = {
	.read_raw = noa1305_read_raw,
	};

	static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case NOA1305_REG_POWER_CONTROL:
	case NOA1305_REG_RESET:
	case NOA1305_REG_INTEGRATION_TIME:
	case NOA1305_REG_INT_SELECT:
	case NOA1305_REG_INT_THRESH_LSB:
	case NOA1305_REG_INT_THRESH_MSB:
	return true;
	default:
	return false;
	}
	}

	static const struct regmap_config noa1305_regmap_config = {
	.name = NOA1305_DRIVER_NAME,
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = NOA1305_REG_DEVICE_ID_MSB,
	.writeable_reg = noa1305_writable_reg,
	};

	static void noa1305_reg_remove(void *data)
	{
	struct noa1305_priv *priv = data;

	regulator_disable(priv->vin_reg);
	}

	static int noa1305_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct noa1305_priv *priv;
	struct iio_dev *indio_dev;
	struct regmap *regmap;
	__le16 data;
	unsigned int dev_id;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
	if (!indio_dev)
	return -ENOMEM;

	regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
	if (IS_ERR(regmap)) {
	dev_err(&client->dev, "Regmap initialization failed.\n");
	return PTR_ERR(regmap);
	}

	priv = iio_priv(indio_dev);

	priv->vin_reg = devm_regulator_get(&client->dev, "vin");
	if (IS_ERR(priv->vin_reg)) {
	dev_err(&client->dev, "get regulator vin failed\n");
	return PTR_ERR(priv->vin_reg);
	}

	ret = regulator_enable(priv->vin_reg);
	if (ret) {
	dev_err(&client->dev, "enable regulator vin failed\n");
	return ret;
	}

	ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv);
	if (ret) {
	dev_err(&client->dev, "addition of devm action failed\n");
	return ret;
	}

	i2c_set_clientdata(client, indio_dev);
	priv->client = client;
	priv->regmap = regmap;

	ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
	if (ret < 0) {
	dev_err(&client->dev, "ID reading failed: %d\n", ret);
	return ret;
	}

	dev_id = le16_to_cpu(data);
	if (dev_id != NOA1305_DEVICE_ID) {
	dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
	return -ENODEV;
	}

	ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
	NOA1305_POWER_CONTROL_ON);
	if (ret < 0) {
	dev_err(&client->dev, "Enabling power control failed\n");
	return ret;
	}

	ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
	if (ret < 0) {
	dev_err(&client->dev, "Device reset failed\n");
	return ret;
	}

	ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
	NOA1305_INTEGR_TIME_800MS);
	if (ret < 0) {
	dev_err(&client->dev, "Setting integration time failed\n");
	return ret;
	}

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &noa1305_info;
	indio_dev->channels = noa1305_channels;
	indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
	indio_dev->name = NOA1305_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = devm_iio_device_register(&client->dev, indio_dev);
	if (ret)
	dev_err(&client->dev, "registering device failed\n");

	return ret;
	}

	static const struct of_device_id noa1305_of_match[] = {
	{ .compatible = "onnn,noa1305" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, noa1305_of_match);

	static const struct i2c_device_id noa1305_ids[] = {
	{ "noa1305", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, noa1305_ids);

	static struct i2c_driver noa1305_driver = {
	.driver = {
	.name = NOA1305_DRIVER_NAME,
	.of_match_table = noa1305_of_match,
	},
	.probe = noa1305_probe,
	.id_table = noa1305_ids,
	};

	module_i2c_driver(noa1305_driver);

	MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
	MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
	MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
	MODULE_LICENSE("GPL");