Orange Pi5 kernel

// 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, "%ld\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,
<------><------><------><------><------>const struct i2c_device_id *id)
{
<------>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 int isl29020_remove(struct i2c_client *client)
{
<------>pm_runtime_disable(&client->dev);
<------>sysfs_remove_group(&client->dev.kobj, &m_als_gr);
<------>return 0;
}
 
static const struct i2c_device_id isl29020_id[] = {
<------>{ "isl29020", 0 },
<------>{ }
};
 
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");