linux/drivers/misc/isl29020.c
Thomas Gleixner 873e65bc09 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 83 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.021731668@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:39 -07:00

228 lines
4.9 KiB
C

// 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)
{
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");