linux/drivers/iio/pressure/st_pressure_i2c.c
Shrirang Bagul 9d317724cf iio: st_pressure: Support i2c probe using acpi
Compatible strings are not available on ACPI based systems. This patch adds
support to use DSDT information read from platform BIOS instead for probing
st pressure sensors.

Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-12-03 08:56:27 +00:00

123 lines
2.8 KiB
C

/*
* STMicroelectronics pressures driver
*
* Copyright 2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/common/st_sensors.h>
#include <linux/iio/common/st_sensors_i2c.h>
#include "st_pressure.h"
#ifdef CONFIG_OF
static const struct of_device_id st_press_of_match[] = {
{
.compatible = "st,lps001wp-press",
.data = LPS001WP_PRESS_DEV_NAME,
},
{
.compatible = "st,lps25h-press",
.data = LPS25H_PRESS_DEV_NAME,
},
{
.compatible = "st,lps331ap-press",
.data = LPS331AP_PRESS_DEV_NAME,
},
{
.compatible = "st,lps22hb-press",
.data = LPS22HB_PRESS_DEV_NAME,
},
{},
};
MODULE_DEVICE_TABLE(of, st_press_of_match);
#else
#define st_press_of_match NULL
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id st_press_acpi_match[] = {
{"SNO9210", LPS22HB},
{ },
};
MODULE_DEVICE_TABLE(acpi, st_press_acpi_match);
#else
#define st_press_acpi_match NULL
#endif
static const struct i2c_device_id st_press_id_table[] = {
{ LPS001WP_PRESS_DEV_NAME, LPS001WP },
{ LPS25H_PRESS_DEV_NAME, LPS25H },
{ LPS331AP_PRESS_DEV_NAME, LPS331AP },
{ LPS22HB_PRESS_DEV_NAME, LPS22HB },
{},
};
MODULE_DEVICE_TABLE(i2c, st_press_id_table);
static int st_press_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct st_sensor_data *press_data;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*press_data));
if (!indio_dev)
return -ENOMEM;
press_data = iio_priv(indio_dev);
if (client->dev.of_node) {
st_sensors_of_i2c_probe(client, st_press_of_match);
} else if (ACPI_HANDLE(&client->dev)) {
ret = st_sensors_match_acpi_device(&client->dev);
if ((ret < 0) || (ret >= ST_PRESS_MAX))
return -ENODEV;
strncpy(client->name, st_press_id_table[ret].name,
sizeof(client->name));
client->name[sizeof(client->name) - 1] = '\0';
} else if (!id)
return -ENODEV;
st_sensors_i2c_configure(indio_dev, client, press_data);
ret = st_press_common_probe(indio_dev);
if (ret < 0)
return ret;
return 0;
}
static int st_press_i2c_remove(struct i2c_client *client)
{
st_press_common_remove(i2c_get_clientdata(client));
return 0;
}
static struct i2c_driver st_press_driver = {
.driver = {
.name = "st-press-i2c",
.of_match_table = of_match_ptr(st_press_of_match),
.acpi_match_table = ACPI_PTR(st_press_acpi_match),
},
.probe = st_press_i2c_probe,
.remove = st_press_i2c_remove,
.id_table = st_press_id_table,
};
module_i2c_driver(st_press_driver);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics pressures i2c driver");
MODULE_LICENSE("GPL v2");