// SPDX-License-Identifier: GPL-2.0-only/* * isl29020.c - Intersil  ALS Driver * * Copyright (C) 2008 Intel Corp * *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf */ #include <linux/module.h>#include <linux/slab.h>#include <linux/i2c.h>#include <linux/err.h>#include <linux/delay.h>#include <linux/sysfs.h>#include <linux/pm_runtime.h> static DEFINE_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, 0x00); 	if (val < 0)		return val;	return sprintf(buf, "%d000\n", 1 << (2 * (val & 3))); } static ssize_t als_lux_input_data_show(struct device *dev,			struct device_attribute *attr, char *buf){	struct i2c_client *client = to_i2c_client(dev);	int ret_val, val;	unsigned long int lux;	int temp; 	pm_runtime_get_sync(dev);	msleep(100); 	mutex_lock(&mutex);	temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */	if (temp < 0) {		pm_runtime_put_sync(dev);		mutex_unlock(&mutex);		return temp;	} 	ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */	mutex_unlock(&mutex); 	if (ret_val < 0) {		pm_runtime_put_sync(dev);		return ret_val;	} 	ret_val |= temp << 8;	val = i2c_smbus_read_byte_data(client, 0x00);	pm_runtime_put_sync(dev);	if (val < 0)		return val;	lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;	return sprintf(buf, "%lu\n", lux);} 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);	int ret_val;	unsigned long val; 	ret_val = kstrtoul(buf, 10, &val);	if (ret_val)		return ret_val; 	if (val < 1 || val > 64000)		return -EINVAL; 	/* Pick the smallest sensor range that will meet our requirements */	if (val <= 1000)		val = 1;	else if (val <= 4000)		val = 2;	else if (val <= 16000)		val = 3;	else		val = 4; 	ret_val = i2c_smbus_read_byte_data(client, 0x00);	if (ret_val < 0)		return ret_val; 	ret_val &= 0xFC; /*reset the bit before setting them */	ret_val |= val - 1;	ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val); 	if (ret_val < 0)		return ret_val;	return count;} static void als_set_power_state(struct i2c_client *client, int enable){	int ret_val; 	ret_val = i2c_smbus_read_byte_data(client, 0x00);	if (ret_val < 0)		return; 	if (enable)		ret_val |= 0x80;	else		ret_val &= 0x7F; 	i2c_smbus_write_byte_data(client, 0x00, 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_lux_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 = "isl29020",	.attrs = mid_att_als}; static int als_set_default_config(struct i2c_client *client){	int retval; 	retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);	if (retval < 0) {		dev_err(&client->dev, "default write failed.");		return retval;	}	return 0;} static int  isl29020_probe(struct i2c_client *client){	int res; 	res = als_set_default_config(client);	if (res <  0)		return res; 	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);	if (res) {		dev_err(&client->dev, "isl29020: device create file failed\n");		return res;	}	dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);	als_set_power_state(client, 0);	pm_runtime_enable(&client->dev);	return res;} static void isl29020_remove(struct i2c_client *client){	pm_runtime_disable(&client->dev);	sysfs_remove_group(&client->dev.kobj, &m_als_gr);} static const struct i2c_device_id isl29020_id[] = {	{ .name = "isl29020" },	{ }}; MODULE_DEVICE_TABLE(i2c, isl29020_id); #ifdef CONFIG_PM static int isl29020_runtime_suspend(struct device *dev){	struct i2c_client *client = to_i2c_client(dev);	als_set_power_state(client, 0);	return 0;} static int isl29020_runtime_resume(struct device *dev){	struct i2c_client *client = to_i2c_client(dev);	als_set_power_state(client, 1);	return 0;} static const struct dev_pm_ops isl29020_pm_ops = {	.runtime_suspend = isl29020_runtime_suspend,	.runtime_resume = isl29020_runtime_resume,}; #define ISL29020_PM_OPS (&isl29020_pm_ops)#else	/* CONFIG_PM */#define ISL29020_PM_OPS NULL#endif	/* CONFIG_PM */ static struct i2c_driver isl29020_driver = {	.driver = {		.name = "isl29020",		.pm = ISL29020_PM_OPS,	},	.probe = isl29020_probe,	.remove = isl29020_remove,	.id_table = isl29020_id,}; module_i2c_driver(isl29020_driver); MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");MODULE_LICENSE("GPL v2");