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/*
* 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");
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