/*
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* STMicroelectronics sensors i2c library driver
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*
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* Copyright 2012-2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/of_device.h>
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#include <linux/acpi.h>
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#include <linux/iio/common/st_sensors_i2c.h>
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#define ST_SENSORS_I2C_MULTIREAD 0x80
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static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
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{
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struct st_sensor_data *sdata = iio_priv(indio_dev);
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return to_i2c_client(sdata->dev)->irq;
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}
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static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
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struct device *dev, u8 reg_addr, u8 *res_byte)
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{
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int err;
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err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr);
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if (err < 0)
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goto st_accel_i2c_read_byte_error;
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*res_byte = err & 0xff;
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st_accel_i2c_read_byte_error:
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return err < 0 ? err : 0;
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}
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static int st_sensors_i2c_read_multiple_byte(
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struct st_sensor_transfer_buffer *tb, struct device *dev,
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u8 reg_addr, int len, u8 *data, bool multiread_bit)
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{
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if (multiread_bit)
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reg_addr |= ST_SENSORS_I2C_MULTIREAD;
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return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev),
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reg_addr, len, data);
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}
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static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
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struct device *dev, u8 reg_addr, u8 data)
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{
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return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
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}
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static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
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.read_byte = st_sensors_i2c_read_byte,
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.write_byte = st_sensors_i2c_write_byte,
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.read_multiple_byte = st_sensors_i2c_read_multiple_byte,
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};
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void st_sensors_i2c_configure(struct iio_dev *indio_dev,
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struct i2c_client *client, struct st_sensor_data *sdata)
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{
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i2c_set_clientdata(client, indio_dev);
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = client->name;
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sdata->dev = &client->dev;
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sdata->tf = &st_sensors_tf_i2c;
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sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
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}
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EXPORT_SYMBOL(st_sensors_i2c_configure);
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#ifdef CONFIG_ACPI
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int st_sensors_match_acpi_device(struct device *dev)
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{
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const struct acpi_device_id *acpi_id;
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kernel_ulong_t driver_data = 0;
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if (ACPI_HANDLE(dev)) {
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acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!acpi_id) {
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dev_err(dev, "No driver data\n");
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return -EINVAL;
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}
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driver_data = acpi_id->driver_data;
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}
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return driver_data;
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}
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EXPORT_SYMBOL(st_sensors_match_acpi_device);
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#endif
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MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
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MODULE_LICENSE("GPL v2");
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