drivers/misc/apds9802als.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * apds9802als.c - apds9802  ALS Driver
  *
  * Copyright (C) 2009 Intel Corp
  *
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/sysfs.h>
 #include <linux/pm_runtime.h>

 #define ALS_MIN_RANGE_VAL 1
 #define ALS_MAX_RANGE_VAL 2
 #define POWER_STA_ENABLE 1
 #define POWER_STA_DISABLE 0

 #define DRIVER_NAME "apds9802als"

 struct als_data {
 	struct mutex mutex;
 };

 static ssize_t als_sensing_range_show(struct device *dev,
 			struct device_attribute *attr,  char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	int  val;

 	val = i2c_smbus_read_byte_data(client, 0x81);
 	if (val < 0)
 		return val;
 	if (val & 1)
 		return sprintf(buf, "4095\n");
 	else
 		return sprintf(buf, "65535\n");
 }

 static int als_wait_for_data_ready(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	int ret;
 	int retry = 10;

 	do {
 		msleep(30);
 		ret = i2c_smbus_read_byte_data(client, 0x86);
 	} while (!(ret & 0x80) && retry--);

 	if (retry < 0) {
 		dev_warn(dev, "timeout waiting for data ready\n");
 		return -ETIMEDOUT;
 	}

 	return 0;
 }

 static ssize_t als_lux0_input_data_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct als_data *data = i2c_get_clientdata(client);
 	int ret_val;
 	int temp;

 	/* Protect against parallel reads */
 	pm_runtime_get_sync(dev);
 	mutex_lock(&data->mutex);

 	/* clear EOC interrupt status */
 	i2c_smbus_write_byte(client, 0x40);
 	/* start measurement */
 	temp = i2c_smbus_read_byte_data(client, 0x81);
 	i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);

 	ret_val = als_wait_for_data_ready(dev);
 	if (ret_val < 0)
 		goto failed;

 	temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
 	if (temp < 0) {
 		ret_val = temp;
 		goto failed;
 	}
 	ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
 	if (ret_val < 0)
 		goto failed;

 	mutex_unlock(&data->mutex);
 	pm_runtime_put_sync(dev);

 	temp = (ret_val << 8) | temp;
 	return sprintf(buf, "%d\n", temp);
 failed:
 	mutex_unlock(&data->mutex);
 	pm_runtime_put_sync(dev);
 	return ret_val;
 }

 static ssize_t als_sensing_range_store(struct device *dev,
 		struct device_attribute *attr, const  char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct als_data *data = i2c_get_clientdata(client);
 	int ret_val;
 	unsigned long val;

 	ret_val = kstrtoul(buf, 10, &val);
 	if (ret_val)
 		return ret_val;

 	if (val < 4096)
 		val = 1;
 	else if (val < 65536)
 		val = 2;
 	else
 		return -ERANGE;

 	pm_runtime_get_sync(dev);

 	/* Make sure nobody else reads/modifies/writes 0x81 while we
 	   are active */
 	mutex_lock(&data->mutex);

 	ret_val = i2c_smbus_read_byte_data(client, 0x81);
 	if (ret_val < 0)
 		goto fail;

 	/* Reset the bits before setting them */
 	ret_val = ret_val & 0xFA;

 	if (val == 1) /* Setting detection range up to 4k LUX */
 		ret_val = (ret_val | 0x01);
 	else /* Setting detection range up to 64k LUX*/
 		ret_val = (ret_val | 0x00);

 	ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);

 	if (ret_val >= 0) {
 		/* All OK */
 		mutex_unlock(&data->mutex);
 		pm_runtime_put_sync(dev);
 		return count;
 	}
 fail:
 	mutex_unlock(&data->mutex);
 	pm_runtime_put_sync(dev);
 	return ret_val;
 }

 static int als_set_power_state(struct i2c_client *client, bool on_off)
 {
 	int ret_val;
 	struct als_data *data = i2c_get_clientdata(client);

 	mutex_lock(&data->mutex);
 	ret_val = i2c_smbus_read_byte_data(client, 0x80);
 	if (ret_val < 0)
 		goto fail;
 	if (on_off)
 		ret_val = ret_val | 0x01;
 	else
 		ret_val = ret_val & 0xFE;
 	ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
 fail:
 	mutex_unlock(&data->mutex);
 	return ret_val;
 }

 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
 	als_sensing_range_show, als_sensing_range_store);
 static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);

 static struct attribute *mid_att_als[] = {
 	&dev_attr_lux0_sensor_range.attr,
 	&dev_attr_lux0_input.attr,
 	NULL
 };

 static const struct attribute_group m_als_gr = {
 	.name = "apds9802als",
 	.attrs = mid_att_als
 };

 static int als_set_default_config(struct i2c_client *client)
 {
 	int ret_val;
 	/* Write the command and then switch on */
 	ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
 	if (ret_val < 0) {
 		dev_err(&client->dev, "failed default switch on write\n");
 		return ret_val;
 	}
 	/* detection range: 1~64K Lux, maunal measurement */
 	ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
 	if (ret_val < 0)
 		dev_err(&client->dev, "failed default LUX on write\n");

 	/*  We always get 0 for the 1st measurement after system power on,
 	 *  so make sure it is finished before user asks for data.
 	 */
 	als_wait_for_data_ready(&client->dev);

 	return ret_val;
 }

 static int apds9802als_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
 	int res;
 	struct als_data *data;

 	data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
 	if (data == NULL) {
 		dev_err(&client->dev, "Memory allocation failed\n");
 		return -ENOMEM;
 	}
 	i2c_set_clientdata(client, data);
 	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
 	if (res) {
 		dev_err(&client->dev, "device create file failed\n");
 		goto als_error1;
 	}
 	dev_info(&client->dev, "ALS chip found\n");
 	als_set_default_config(client);
 	mutex_init(&data->mutex);

 	pm_runtime_set_active(&client->dev);
 	pm_runtime_enable(&client->dev);

 	return res;
 als_error1:
 	kfree(data);
 	return res;
 }

 static int apds9802als_remove(struct i2c_client *client)
 {
 	struct als_data *data = i2c_get_clientdata(client);

 	pm_runtime_get_sync(&client->dev);

 	als_set_power_state(client, false);
 	sysfs_remove_group(&client->dev.kobj, &m_als_gr);

 	pm_runtime_disable(&client->dev);
 	pm_runtime_set_suspended(&client->dev);
 	pm_runtime_put_noidle(&client->dev);

 	kfree(data);
 	return 0;
 }

 #ifdef CONFIG_PM

 static int apds9802als_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);

 	als_set_power_state(client, false);
 	return 0;
 }

 static int apds9802als_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);

 	als_set_power_state(client, true);
 	return 0;
 }

 static UNIVERSAL_DEV_PM_OPS(apds9802als_pm_ops, apds9802als_suspend,
 	apds9802als_resume, NULL);

 #define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)

 #else	/* CONFIG_PM */
 #define APDS9802ALS_PM_OPS NULL
 #endif	/* CONFIG_PM */

 static const struct i2c_device_id apds9802als_id[] = {
 	{ DRIVER_NAME, 0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, apds9802als_id);

 static struct i2c_driver apds9802als_driver = {
 	.driver = {
 		.name = DRIVER_NAME,
 		.pm = APDS9802ALS_PM_OPS,
 	},
 	.probe = apds9802als_probe,
 	.remove = apds9802als_remove,
 	.id_table = apds9802als_id,
 };

 module_i2c_driver(apds9802als_driver);

 MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
 MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* apds9802als.c - apds9802 ALS Driver
	*
	* Copyright (C) 2009 Intel Corp
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/err.h>
	#include <linux/delay.h>
	#include <linux/mutex.h>
	#include <linux/sysfs.h>
	#include <linux/pm_runtime.h>

	#define ALS_MIN_RANGE_VAL 1
	#define ALS_MAX_RANGE_VAL 2
	#define POWER_STA_ENABLE 1
	#define POWER_STA_DISABLE 0

	#define DRIVER_NAME "apds9802als"

	struct als_data {
	struct mutex mutex;
	};

	static ssize_t als_sensing_range_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	int val;

	val = i2c_smbus_read_byte_data(client, 0x81);
	if (val < 0)
	return val;
	if (val & 1)
	return sprintf(buf, "4095\n");
	else
	return sprintf(buf, "65535\n");
	}

	static int als_wait_for_data_ready(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	int ret;
	int retry = 10;

	do {
	msleep(30);
	ret = i2c_smbus_read_byte_data(client, 0x86);
	} while (!(ret & 0x80) && retry--);

	if (retry < 0) {
	dev_warn(dev, "timeout waiting for data ready\n");
	return -ETIMEDOUT;
	}

	return 0;
	}

	static ssize_t als_lux0_input_data_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct als_data *data = i2c_get_clientdata(client);
	int ret_val;
	int temp;

	/* Protect against parallel reads */
	pm_runtime_get_sync(dev);
	mutex_lock(&data->mutex);

	/* clear EOC interrupt status */
	i2c_smbus_write_byte(client, 0x40);
	/* start measurement */
	temp = i2c_smbus_read_byte_data(client, 0x81);
	i2c_smbus_write_byte_data(client, 0x81, temp \| 0x08);

	ret_val = als_wait_for_data_ready(dev);
	if (ret_val < 0)
	goto failed;

	temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
	if (temp < 0) {
	ret_val = temp;
	goto failed;
	}
	ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
	if (ret_val < 0)
	goto failed;

	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);

	temp = (ret_val << 8) \| temp;
	return sprintf(buf, "%d\n", temp);
	failed:
	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);
	return ret_val;
	}

	static ssize_t als_sensing_range_store(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct als_data *data = i2c_get_clientdata(client);
	int ret_val;
	unsigned long val;

	ret_val = kstrtoul(buf, 10, &val);
	if (ret_val)
	return ret_val;

	if (val < 4096)
	val = 1;
	else if (val < 65536)
	val = 2;
	else
	return -ERANGE;

	pm_runtime_get_sync(dev);

	/* Make sure nobody else reads/modifies/writes 0x81 while we
	are active */
	mutex_lock(&data->mutex);

	ret_val = i2c_smbus_read_byte_data(client, 0x81);
	if (ret_val < 0)
	goto fail;

	/* Reset the bits before setting them */
	ret_val = ret_val & 0xFA;

	if (val == 1) /* Setting detection range up to 4k LUX */
	ret_val = (ret_val \| 0x01);
	else /* Setting detection range up to 64k LUX*/
	ret_val = (ret_val \| 0x00);

	ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);

	if (ret_val >= 0) {
	/* All OK */
	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);
	return count;
	}
	fail:
	mutex_unlock(&data->mutex);
	pm_runtime_put_sync(dev);
	return ret_val;
	}

	static int als_set_power_state(struct i2c_client *client, bool on_off)
	{
	int ret_val;
	struct als_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->mutex);
	ret_val = i2c_smbus_read_byte_data(client, 0x80);
	if (ret_val < 0)
	goto fail;
	if (on_off)
	ret_val = ret_val \| 0x01;
	else
	ret_val = ret_val & 0xFE;
	ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
	fail:
	mutex_unlock(&data->mutex);
	return ret_val;
	}

	static DEVICE_ATTR(lux0_sensor_range, S_IRUGO \| S_IWUSR,
	als_sensing_range_show, als_sensing_range_store);
	static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);

	static struct attribute *mid_att_als[] = {
	&dev_attr_lux0_sensor_range.attr,
	&dev_attr_lux0_input.attr,
	NULL
	};

	static const struct attribute_group m_als_gr = {
	.name = "apds9802als",
	.attrs = mid_att_als
	};

	static int als_set_default_config(struct i2c_client *client)
	{
	int ret_val;
	/* Write the command and then switch on */
	ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
	if (ret_val < 0) {
	dev_err(&client->dev, "failed default switch on write\n");
	return ret_val;
	}
	/* detection range: 1~64K Lux, maunal measurement */
	ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
	if (ret_val < 0)
	dev_err(&client->dev, "failed default LUX on write\n");

	/* We always get 0 for the 1st measurement after system power on,
	* so make sure it is finished before user asks for data.
	*/
	als_wait_for_data_ready(&client->dev);

	return ret_val;
	}

	static int apds9802als_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int res;
	struct als_data *data;

	data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
	if (data == NULL) {
	dev_err(&client->dev, "Memory allocation failed\n");
	return -ENOMEM;
	}
	i2c_set_clientdata(client, data);
	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
	if (res) {
	dev_err(&client->dev, "device create file failed\n");
	goto als_error1;
	}
	dev_info(&client->dev, "ALS chip found\n");
	als_set_default_config(client);
	mutex_init(&data->mutex);

	pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);

	return res;
	als_error1:
	kfree(data);
	return res;
	}

	static int apds9802als_remove(struct i2c_client *client)
	{
	struct als_data *data = i2c_get_clientdata(client);

	pm_runtime_get_sync(&client->dev);

	als_set_power_state(client, false);
	sysfs_remove_group(&client->dev.kobj, &m_als_gr);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
	pm_runtime_put_noidle(&client->dev);

	kfree(data);
	return 0;
	}

	#ifdef CONFIG_PM

	static int apds9802als_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);

	als_set_power_state(client, false);
	return 0;
	}

	static int apds9802als_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);

	als_set_power_state(client, true);
	return 0;
	}

	static UNIVERSAL_DEV_PM_OPS(apds9802als_pm_ops, apds9802als_suspend,
	apds9802als_resume, NULL);

	#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)

	#else /* CONFIG_PM */
	#define APDS9802ALS_PM_OPS NULL
	#endif /* CONFIG_PM */

	static const struct i2c_device_id apds9802als_id[] = {
	{ DRIVER_NAME, 0 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, apds9802als_id);

	static struct i2c_driver apds9802als_driver = {
	.driver = {
	.name = DRIVER_NAME,
	.pm = APDS9802ALS_PM_OPS,
	},
	.probe = apds9802als_probe,
	.remove = apds9802als_remove,
	.id_table = apds9802als_id,
	};

	module_i2c_driver(apds9802als_driver);

	MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
	MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
	MODULE_LICENSE("GPL v2");