133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
|
/*
|
||
|
* STMicroelectronics sensors i2c library driver
|
||
|
*
|
||
|
* Copyright 2012-2013 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/iio/iio.h>
|
||
|
#include <linux/of_device.h>
|
||
|
#include <linux/acpi.h>
|
||
|
|
||
|
#include <linux/iio/common/st_sensors_i2c.h>
|
||
|
|
||
|
|
||
|
#define ST_SENSORS_I2C_MULTIREAD 0x80
|
||
|
|
||
|
static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
|
||
|
{
|
||
|
struct st_sensor_data *sdata = iio_priv(indio_dev);
|
||
|
|
||
|
return to_i2c_client(sdata->dev)->irq;
|
||
|
}
|
||
|
|
||
|
static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
|
||
|
struct device *dev, u8 reg_addr, u8 *res_byte)
|
||
|
{
|
||
|
int err;
|
||
|
|
||
|
err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr);
|
||
|
if (err < 0)
|
||
|
goto st_accel_i2c_read_byte_error;
|
||
|
|
||
|
*res_byte = err & 0xff;
|
||
|
|
||
|
st_accel_i2c_read_byte_error:
|
||
|
return err < 0 ? err : 0;
|
||
|
}
|
||
|
|
||
|
static int st_sensors_i2c_read_multiple_byte(
|
||
|
struct st_sensor_transfer_buffer *tb, struct device *dev,
|
||
|
u8 reg_addr, int len, u8 *data, bool multiread_bit)
|
||
|
{
|
||
|
if (multiread_bit)
|
||
|
reg_addr |= ST_SENSORS_I2C_MULTIREAD;
|
||
|
|
||
|
return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev),
|
||
|
reg_addr, len, data);
|
||
|
}
|
||
|
|
||
|
static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
|
||
|
struct device *dev, u8 reg_addr, u8 data)
|
||
|
{
|
||
|
return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
|
||
|
}
|
||
|
|
||
|
static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
|
||
|
.read_byte = st_sensors_i2c_read_byte,
|
||
|
.write_byte = st_sensors_i2c_write_byte,
|
||
|
.read_multiple_byte = st_sensors_i2c_read_multiple_byte,
|
||
|
};
|
||
|
|
||
|
void st_sensors_i2c_configure(struct iio_dev *indio_dev,
|
||
|
struct i2c_client *client, struct st_sensor_data *sdata)
|
||
|
{
|
||
|
i2c_set_clientdata(client, indio_dev);
|
||
|
|
||
|
indio_dev->dev.parent = &client->dev;
|
||
|
indio_dev->name = client->name;
|
||
|
|
||
|
sdata->dev = &client->dev;
|
||
|
sdata->tf = &st_sensors_tf_i2c;
|
||
|
sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
|
||
|
}
|
||
|
EXPORT_SYMBOL(st_sensors_i2c_configure);
|
||
|
|
||
|
#ifdef CONFIG_OF
|
||
|
/**
|
||
|
* st_sensors_of_i2c_probe() - device tree probe for ST I2C sensors
|
||
|
* @client: the I2C client device for the sensor
|
||
|
* @match: the OF match table for the device, containing compatible strings
|
||
|
* but also a .data field with the corresponding internal kernel name
|
||
|
* used by this sensor.
|
||
|
*
|
||
|
* In effect this function matches a compatible string to an internal kernel
|
||
|
* name for a certain sensor device, so that the rest of the autodetection can
|
||
|
* rely on that name from this point on. I2C client devices will be renamed
|
||
|
* to match the internal kernel convention.
|
||
|
*/
|
||
|
void st_sensors_of_i2c_probe(struct i2c_client *client,
|
||
|
const struct of_device_id *match)
|
||
|
{
|
||
|
const struct of_device_id *of_id;
|
||
|
|
||
|
of_id = of_match_device(match, &client->dev);
|
||
|
if (!of_id)
|
||
|
return;
|
||
|
|
||
|
/* The name from the OF match takes precedence if present */
|
||
|
strncpy(client->name, of_id->data, sizeof(client->name));
|
||
|
client->name[sizeof(client->name) - 1] = '\0';
|
||
|
}
|
||
|
EXPORT_SYMBOL(st_sensors_of_i2c_probe);
|
||
|
#endif
|
||
|
|
||
|
#ifdef CONFIG_ACPI
|
||
|
int st_sensors_match_acpi_device(struct device *dev)
|
||
|
{
|
||
|
const struct acpi_device_id *acpi_id;
|
||
|
kernel_ulong_t driver_data = 0;
|
||
|
|
||
|
if (ACPI_HANDLE(dev)) {
|
||
|
acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
|
||
|
if (!acpi_id) {
|
||
|
dev_err(dev, "No driver data\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
driver_data = acpi_id->driver_data;
|
||
|
}
|
||
|
return driver_data;
|
||
|
}
|
||
|
EXPORT_SYMBOL(st_sensors_match_acpi_device);
|
||
|
#endif
|
||
|
|
||
|
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
|
||
|
MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
|
||
|
MODULE_LICENSE("GPL v2");
|