mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 13:44:15 +08:00
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: Anantha Narayanan <anantha.narayanan@intel.com> [The 4K and 64K in the hw spec actually means 4095 (12bit) and 65535 (16bit).] Signed-off-by: Hong Liu <hong.liu@intel.com> [Updated to match the ALS light API interface convention from Samu] Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
anantha
Linus Torvalds
parent
8a233f01b7
commit
22d96aa59c
@ -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
|
||||
|
||||
308
drivers/misc/apds9802als.c
Normal file
308
drivers/misc/apds9802als.c
Normal file
@ -0,0 +1,308 @@
|
||||
/*
|
||||
* 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");
|
||||
Loading…
Reference in New Issue
Block a user