forked from Minki/linux
e4a70e3e7d
Add support to STM HTS221 humidity + temperature sensor http://www.st.com/resource/en/datasheet/hts221.pdf - continuous mode support - i2c support - spi support - trigger mode support Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
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* STMicroelectronics hts221 i2c driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@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/i2c.h>
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#include <linux/slab.h>
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#include "hts221.h"
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#define I2C_AUTO_INCREMENT 0x80
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static int hts221_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
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{
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struct i2c_msg msg[2];
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struct i2c_client *client = to_i2c_client(dev);
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if (len > 1)
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addr |= I2C_AUTO_INCREMENT;
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msg[0].addr = client->addr;
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msg[0].flags = client->flags;
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msg[0].len = 1;
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msg[0].buf = &addr;
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msg[1].addr = client->addr;
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msg[1].flags = client->flags | I2C_M_RD;
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msg[1].len = len;
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msg[1].buf = data;
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return i2c_transfer(client->adapter, msg, 2);
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}
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static int hts221_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
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{
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u8 send[len + 1];
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struct i2c_msg msg;
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struct i2c_client *client = to_i2c_client(dev);
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if (len > 1)
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addr |= I2C_AUTO_INCREMENT;
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send[0] = addr;
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memcpy(&send[1], data, len * sizeof(u8));
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msg.addr = client->addr;
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msg.flags = client->flags;
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msg.len = len + 1;
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msg.buf = send;
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return i2c_transfer(client->adapter, &msg, 1);
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}
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static const struct hts221_transfer_function hts221_transfer_fn = {
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.read = hts221_i2c_read,
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.write = hts221_i2c_write,
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};
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static int hts221_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct hts221_hw *hw;
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struct iio_dev *iio_dev;
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iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*hw));
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if (!iio_dev)
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return -ENOMEM;
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i2c_set_clientdata(client, iio_dev);
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hw = iio_priv(iio_dev);
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hw->name = client->name;
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hw->dev = &client->dev;
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hw->irq = client->irq;
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hw->tf = &hts221_transfer_fn;
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return hts221_probe(iio_dev);
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}
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static const struct of_device_id hts221_i2c_of_match[] = {
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{ .compatible = "st,hts221", },
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{},
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};
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MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);
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static const struct i2c_device_id hts221_i2c_id_table[] = {
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{ HTS221_DEV_NAME },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
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static struct i2c_driver hts221_driver = {
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.driver = {
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.name = "hts221_i2c",
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.of_match_table = of_match_ptr(hts221_i2c_of_match),
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},
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.probe = hts221_i2c_probe,
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.id_table = hts221_i2c_id_table,
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};
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module_i2c_driver(hts221_driver);
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MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
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MODULE_LICENSE("GPL v2");
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