6db4831e98
Android 14
239 lines
5.5 KiB
C
239 lines
5.5 KiB
C
/*
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* isl29020.c - Intersil ALS Driver
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*
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* Copyright (C) 2008 Intel Corp
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/sysfs.h>
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#include <linux/pm_runtime.h>
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static DEFINE_MUTEX(mutex);
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static ssize_t als_sensing_range_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int val;
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val = i2c_smbus_read_byte_data(client, 0x00);
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if (val < 0)
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return val;
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return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
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}
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static ssize_t als_lux_input_data_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret_val, val;
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unsigned long int lux;
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int temp;
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pm_runtime_get_sync(dev);
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msleep(100);
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mutex_lock(&mutex);
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temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
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if (temp < 0) {
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pm_runtime_put_sync(dev);
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mutex_unlock(&mutex);
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return temp;
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}
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ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
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mutex_unlock(&mutex);
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if (ret_val < 0) {
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pm_runtime_put_sync(dev);
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return ret_val;
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}
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ret_val |= temp << 8;
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val = i2c_smbus_read_byte_data(client, 0x00);
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pm_runtime_put_sync(dev);
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if (val < 0)
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return val;
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lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
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return sprintf(buf, "%ld\n", lux);
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}
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static ssize_t als_sensing_range_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret_val;
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unsigned long val;
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ret_val = kstrtoul(buf, 10, &val);
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if (ret_val)
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return ret_val;
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if (val < 1 || val > 64000)
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return -EINVAL;
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/* Pick the smallest sensor range that will meet our requirements */
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if (val <= 1000)
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val = 1;
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else if (val <= 4000)
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val = 2;
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else if (val <= 16000)
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val = 3;
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else
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val = 4;
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ret_val = i2c_smbus_read_byte_data(client, 0x00);
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if (ret_val < 0)
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return ret_val;
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ret_val &= 0xFC; /*reset the bit before setting them */
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ret_val |= val - 1;
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ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
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if (ret_val < 0)
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return ret_val;
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return count;
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}
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static void als_set_power_state(struct i2c_client *client, int enable)
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{
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int ret_val;
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ret_val = i2c_smbus_read_byte_data(client, 0x00);
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if (ret_val < 0)
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return;
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if (enable)
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ret_val |= 0x80;
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else
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ret_val &= 0x7F;
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i2c_smbus_write_byte_data(client, 0x00, ret_val);
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}
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static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
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als_sensing_range_show, als_sensing_range_store);
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static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
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static struct attribute *mid_att_als[] = {
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&dev_attr_lux0_sensor_range.attr,
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&dev_attr_lux0_input.attr,
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NULL
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};
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static const struct attribute_group m_als_gr = {
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.name = "isl29020",
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.attrs = mid_att_als
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};
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static int als_set_default_config(struct i2c_client *client)
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{
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int retval;
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retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
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if (retval < 0) {
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dev_err(&client->dev, "default write failed.");
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return retval;
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}
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return 0;
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}
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static int isl29020_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int res;
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res = als_set_default_config(client);
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if (res < 0)
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return res;
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res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
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if (res) {
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dev_err(&client->dev, "isl29020: device create file failed\n");
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return res;
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}
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dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
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als_set_power_state(client, 0);
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pm_runtime_enable(&client->dev);
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return res;
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}
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static int isl29020_remove(struct i2c_client *client)
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{
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sysfs_remove_group(&client->dev.kobj, &m_als_gr);
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return 0;
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}
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static const struct i2c_device_id isl29020_id[] = {
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{ "isl29020", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, isl29020_id);
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#ifdef CONFIG_PM
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static int isl29020_runtime_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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als_set_power_state(client, 0);
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return 0;
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}
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static int isl29020_runtime_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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als_set_power_state(client, 1);
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return 0;
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}
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static const struct dev_pm_ops isl29020_pm_ops = {
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.runtime_suspend = isl29020_runtime_suspend,
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.runtime_resume = isl29020_runtime_resume,
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};
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#define ISL29020_PM_OPS (&isl29020_pm_ops)
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#else /* CONFIG_PM */
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#define ISL29020_PM_OPS NULL
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#endif /* CONFIG_PM */
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static struct i2c_driver isl29020_driver = {
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.driver = {
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.name = "isl29020",
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.pm = ISL29020_PM_OPS,
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},
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.probe = isl29020_probe,
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.remove = isl29020_remove,
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.id_table = isl29020_id,
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};
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module_i2c_driver(isl29020_driver);
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MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
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MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
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MODULE_LICENSE("GPL v2");
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