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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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7be178bb48
Signed-off-by: Denis Ciocca <denis.ciocca@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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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/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(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_OF
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/**
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* st_sensors_of_i2c_probe() - device tree probe for ST I2C sensors
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* @client: the I2C client device for the sensor
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* @match: the OF match table for the device, containing compatible strings
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* but also a .data field with the corresponding internal kernel name
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* used by this sensor.
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*
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* In effect this function matches a compatible string to an internal kernel
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* name for a certain sensor device, so that the rest of the autodetection can
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* rely on that name from this point on. I2C client devices will be renamed
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* to match the internal kernel convention.
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*/
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void st_sensors_of_i2c_probe(struct i2c_client *client,
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const struct of_device_id *match)
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{
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const struct of_device_id *of_id;
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of_id = of_match_device(match, &client->dev);
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if (!of_id)
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return;
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/* The name from the OF match takes precedence if present */
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strncpy(client->name, of_id->data, sizeof(client->name));
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client->name[sizeof(client->name) - 1] = '\0';
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}
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EXPORT_SYMBOL(st_sensors_of_i2c_probe);
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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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