/*
* isl29020.c - Intersil ALS Driver
*
* Copyright (C) 2008 Intel Corp
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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)
{
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");
