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drivers/misc/isl29020.c: ambient light sensor 

The LS driver will read the latest Lux measurement based upon the light
brightness and will report the LUX output through sysfs interface.

This hardware isn't quite the same as the ISL29003 so has a different
driver.

[akpm@linux-foundation.org: put PM code under #ifdef CONFIG_PM]
Signed-off-by: Kalhan Trisal <kalhan.trisal@intel.com>
[Runtime power management support added]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
[Fixes to runtime PM]
Signed-off-by: Liu Hong <hong.liu@intel.com>
[Cleanups and added checks for I2C errors, reworked the API to match the
 saner one agreed for other sensors]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Kalhan Trisal 2010-10-26 14:22:40 -07:00 committed by Linus Torvalds
parent 93e2f585c1
commit 2e85c4ddd3
3 changed files with 259 additions and 0 deletions
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10
drivers/misc/Kconfig
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@ -295,6 +295,16 @@ config ISL29003
This driver can also be built as a module. If so, the module
will be called isl29003.
config ISL29020
tristate "Intersil ISL29020 ambient light sensor"
depends on I2C
help
If you say yes here you get support for the Intersil ISL29020
ambient light sensor.
This driver can also be built as a module. If so, the module
will be called isl29020.
config SENSORS_TSL2550
tristate "Taos TSL2550 ambient light sensor"
depends on I2C && SYSFS

1
drivers/misc/Makefile
View File

@ -26,6 +26,7 @@ obj-$(CONFIG_SGI_GRU) += sgi-gru/
obj-$(CONFIG_CS5535_MFGPT) += cs5535-mfgpt.o
obj-$(CONFIG_HP_ILO) += hpilo.o
obj-$(CONFIG_ISL29003) += isl29003.o
obj-$(CONFIG_ISL29020) += isl29020.o
obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
obj-$(CONFIG_DS1682) += ds1682.o

248
drivers/misc/isl29020.c 100644
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@ -0,0 +1,248 @@
/*
* 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/init.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);
unsigned int ret_val;
unsigned long val;
if (strict_strtoul(buf, 10, &val))
return -EINVAL;
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);
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 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)
{
struct als_data *data = i2c_get_clientdata(client);
sysfs_remove_group(&client->dev.kobj, &m_als_gr);
kfree(data);
return 0;
}
static 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,
};
static int __init sensor_isl29020_init(void)
{
return i2c_add_driver(&isl29020_driver);
}
static void __exit sensor_isl29020_exit(void)
{
i2c_del_driver(&isl29020_driver);
}
module_init(sensor_isl29020_init);
module_exit(sensor_isl29020_exit);
MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
MODULE_LICENSE("GPL v2");