Commit 22d96aa5 authored by anantha's avatar anantha Committed by Linus Torvalds

drivers/misc/apds9802als.c: ALS drivers for the apds9802als

This adds support for the ADPS9802ALS sensor.

Cleanup by Alan Cox
	- move mutexes to cover more things
	- report I/O errors back to user space
	- report range and values in LUX
Signed-off-by: default avatarAnantha Narayanan <anantha.narayanan@intel.com>
[The 4K and 64K in the hw spec actually means 4095 (12bit) and 65535 (16bit).]
Signed-off-by: default avatarHong Liu <hong.liu@intel.com>
[Updated to match the ALS light API interface convention from Samu]
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8a233f01
......@@ -285,6 +285,16 @@ config SGI_GRU_DEBUG
This option enables addition debugging code for the SGI GRU driver. If
you are unsure, say N.
config APDS9802ALS
tristate "Medfield Avago APDS9802 ALS Sensor module"
depends on I2C
help
If you say yes here you get support for the ALS APDS9802 ambient
light sensor.
This driver can also be built as a module. If so, the module
will be called apds9802als.
config ISL29003
tristate "Intersil ISL29003 ambient light sensor"
depends on I2C && SYSFS
......
......@@ -25,6 +25,7 @@ obj-$(CONFIG_SGI_XP) += sgi-xp/
obj-$(CONFIG_SGI_GRU) += sgi-gru/
obj-$(CONFIG_CS5535_MFGPT) += cs5535-mfgpt.o
obj-$(CONFIG_HP_ILO) += hpilo.o
obj-$(CONFIG_APDS9802ALS) += apds9802als.o
obj-$(CONFIG_ISL29003) += isl29003.o
obj-$(CONFIG_ISL29020) += isl29020.o
obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
......
/*
* apds9802als.c - apds9802 ALS Driver
*
* Copyright (C) 2009 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.
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#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/mutex.h>
#include <linux/sysfs.h>
#include <linux/hwmon-sysfs.h>
#define ALS_MIN_RANGE_VAL 1
#define ALS_MAX_RANGE_VAL 2
#define POWER_STA_ENABLE 1
#define POWER_STA_DISABLE 0
#define APDS9802ALS_I2C_ADDR 0x29
#define DRIVER_NAME "apds9802als"
struct als_data {
struct device *hwmon_dev;
bool needresume;
struct 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, 0x81);
if (val < 0)
return val;
if (val & 1)
return sprintf(buf, "4095\n");
else
return sprintf(buf, "65535\n");
}
static ssize_t als_lux0_input_data_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct als_data *data = i2c_get_clientdata(client);
unsigned int ret_val;
int temp;
/* Protect against parallel reads */
mutex_lock(&data->mutex);
temp = i2c_smbus_read_byte_data(client, 0x8C);/*LSB data*/
if (temp < 0) {
ret_val = temp;
goto failed;
}
ret_val = i2c_smbus_read_byte_data(client, 0x8D);/*MSB data*/
if (ret_val < 0)
goto failed;
mutex_unlock(&data->mutex);
ret_val = (ret_val << 8) | temp;
return sprintf(buf, "%d\n", ret_val);
failed:
mutex_unlock(&data->mutex);
return ret_val;
}
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);
struct als_data *data = i2c_get_clientdata(client);
unsigned int ret_val;
unsigned long val;
if (strict_strtoul(buf, 10, &val))
return -EINVAL;
if (val < 4096)
val = 1;
else if (val < 65536)
val = 2;
else
return -ERANGE;
/* Make sure nobody else reads/modifies/writes 0x81 while we
are active */
mutex_lock(&data->mutex);
ret_val = i2c_smbus_read_byte_data(client, 0x81);
if (ret_val < 0)
goto fail;
/* Reset the bits before setting them */
ret_val = ret_val & 0xFA;
if (val == 1) /* Setting the continous measurement up to 4k LUX */
ret_val = (ret_val | 0x05);
else /* Setting the continous measurement up to 64k LUX*/
ret_val = (ret_val | 0x04);
ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
if (ret_val >= 0) {
/* All OK */
mutex_unlock(&data->mutex);
return count;
}
fail:
mutex_unlock(&data->mutex);
return ret_val;
}
static ssize_t als_power_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
int ret_val;
ret_val = i2c_smbus_read_byte_data(client, 0x80);
if (ret_val < 0)
return ret_val;
ret_val = ret_val & 0x01;
return sprintf(buf, "%d\n", ret_val);
}
static int als_set_power_state(struct i2c_client *client, bool on_off)
{
int ret_val;
struct als_data *data = i2c_get_clientdata(client);
mutex_lock(&data->mutex);
ret_val = i2c_smbus_read_byte_data(client, 0x80);
if (ret_val < 0)
goto fail;
if (on_off)
ret_val = ret_val | 0x01;
else
ret_val = ret_val & 0xFE;
ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
fail:
mutex_unlock(&data->mutex);
return ret_val;
}
static ssize_t als_power_status_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct als_data *data = i2c_get_clientdata(client);
unsigned long val;
int ret_val;
if (strict_strtoul(buf, 10, &val))
return -EINVAL;
if (val == POWER_STA_ENABLE) {
ret_val = als_set_power_state(client, true);
data->needresume = true;
} else if (val == POWER_STA_DISABLE) {
ret_val = als_set_power_state(client, false);
data->needresume = false;
} else
return -EINVAL;
if (ret_val < 0)
return ret_val;
return count;
}
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_lux0_input_data_show, NULL);
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
als_power_status_show, als_power_status_store);
static struct attribute *mid_att_als[] = {
&dev_attr_lux0_sensor_range.attr,
&dev_attr_lux0_input.attr,
&dev_attr_power_state.attr,
NULL
};
static struct attribute_group m_als_gr = {
.name = "apds9802als",
.attrs = mid_att_als
};
static int als_set_default_config(struct i2c_client *client)
{
int ret_val;
/* Write the command and then switch on */
ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
if (ret_val < 0) {
dev_err(&client->dev, "failed default switch on write\n");
return ret_val;
}
/* Continous from 1Lux to 64k Lux */
ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x04);
if (ret_val < 0)
dev_err(&client->dev, "failed default LUX on write\n");
return ret_val;
}
static int apds9802als_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int res;
struct als_data *data;
data = kzalloc(sizeof(struct als_data), GFP_KERNEL);
if (data == NULL) {
dev_err(&client->dev, "Memory allocation failed\n");
return -ENOMEM;
}
i2c_set_clientdata(client, data);
res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
if (res) {
dev_err(&client->dev, "device create file failed\n");
goto als_error1;
}
dev_info(&client->dev,
"%s apds9802als: ALS chip found\n", client->name);
als_set_default_config(client);
data->needresume = true;
mutex_init(&data->mutex);
return res;
als_error1:
i2c_set_clientdata(client, NULL);
kfree(data);
return res;
}
static int apds9802als_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 int apds9802als_suspend(struct i2c_client *client, pm_message_t mesg)
{
als_set_power_state(client, false);
return 0;
}
static int apds9802als_resume(struct i2c_client *client)
{
struct als_data *data = i2c_get_clientdata(client);
if (data->needresume == true)
als_set_power_state(client, true);
return 0;
}
static struct i2c_device_id apds9802als_id[] = {
{ DRIVER_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, apds9802als_id);
static struct i2c_driver apds9802als_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.probe = apds9802als_probe,
.remove = apds9802als_remove,
.suspend = apds9802als_suspend,
.resume = apds9802als_resume,
.id_table = apds9802als_id,
};
static int __init sensor_apds9802als_init(void)
{
return i2c_add_driver(&apds9802als_driver);
}
static void __exit sensor_apds9802als_exit(void)
{
i2c_del_driver(&apds9802als_driver);
}
module_init(sensor_apds9802als_init);
module_exit(sensor_apds9802als_exit);
MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
MODULE_LICENSE("GPL v2");
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