cregit-Linux how code gets into the kernel

Release 4.7 drivers/iio/common/st_sensors/st_sensors_i2c.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/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; }

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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; }

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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(to_i2c_client(dev), reg_addr, len, data); }

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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); }

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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; }

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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'; }

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EXPORT_SYMBOL(st_sensors_of_i2c_probe); #endif MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); MODULE_LICENSE("GPL v2");

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