[linux-2.6-block.git] / drivers / iio / humidity / hts221_i2c.c

/*
 * STMicroelectronics hts221 i2c driver
 *
 * Copyright 2016 STMicroelectronics Inc.
 *
 * Lorenzo Bianconi <lorenzo.bianconi@st.com>
 *
 * Licensed under the GPL-2.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include "hts221.h"

#define I2C_AUTO_INCREMENT	0x80

static int hts221_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
{
	struct i2c_msg msg[2];
	struct i2c_client *client = to_i2c_client(dev);

	if (len > 1)
		addr |= I2C_AUTO_INCREMENT;

	msg[0].addr = client->addr;
	msg[0].flags = client->flags;
	msg[0].len = 1;
	msg[0].buf = &addr;

	msg[1].addr = client->addr;
	msg[1].flags = client->flags | I2C_M_RD;
	msg[1].len = len;
	msg[1].buf = data;

	return i2c_transfer(client->adapter, msg, 2);
}

static int hts221_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
{
	u8 send[len + 1];
	struct i2c_msg msg;
	struct i2c_client *client = to_i2c_client(dev);

	if (len > 1)
		addr |= I2C_AUTO_INCREMENT;

	send[0] = addr;
	memcpy(&send[1], data, len * sizeof(u8));

	msg.addr = client->addr;
	msg.flags = client->flags;
	msg.len = len + 1;
	msg.buf = send;

	return i2c_transfer(client->adapter, &msg, 1);
}

static const struct hts221_transfer_function hts221_transfer_fn = {
	.read = hts221_i2c_read,
	.write = hts221_i2c_write,
};

static int hts221_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct hts221_hw *hw;
	struct iio_dev *iio_dev;

	iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*hw));
	if (!iio_dev)
		return -ENOMEM;

	i2c_set_clientdata(client, iio_dev);

	hw = iio_priv(iio_dev);
	hw->name = client->name;
	hw->dev = &client->dev;
	hw->irq = client->irq;
	hw->tf = &hts221_transfer_fn;

	return hts221_probe(iio_dev);
}

static const struct acpi_device_id hts221_acpi_match[] = {
	{"SMO9100", 0},
	{ },
};
MODULE_DEVICE_TABLE(acpi, hts221_acpi_match);

static const struct of_device_id hts221_i2c_of_match[] = {
	{ .compatible = "st,hts221", },
	{},
};
MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);

static const struct i2c_device_id hts221_i2c_id_table[] = {
	{ HTS221_DEV_NAME },
	{},
};
MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);

static struct i2c_driver hts221_driver = {
	.driver = {
		.name = "hts221_i2c",
		.pm = &hts221_pm_ops,
		.of_match_table = of_match_ptr(hts221_i2c_of_match),
		.acpi_match_table = ACPI_PTR(hts221_acpi_match),
	},
	.probe = hts221_i2c_probe,
	.id_table = hts221_i2c_id_table,
};
module_i2c_driver(hts221_driver);

MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e4a70e3e LB	1	/*
	2	* STMicroelectronics hts221 i2c driver
	3	*
	4	* Copyright 2016 STMicroelectronics Inc.
	5	*
	6	* Lorenzo Bianconi <lorenzo.bianconi@st.com>
	7	*
	8	* Licensed under the GPL-2.
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
25fc503e	13	#include <linux/acpi.h>
e4a70e3e LB	14	#include <linux/i2c.h>
	15	#include <linux/slab.h>
	16	#include "hts221.h"
	17
	18	#define I2C_AUTO_INCREMENT 0x80
	19
	20	static int hts221_i2c_read(struct device dev, u8 addr, int len, u8 data)
	21	{
	22	struct i2c_msg msg[2];
	23	struct i2c_client *client = to_i2c_client(dev);
	24
	25	if (len > 1)
	26	addr \|= I2C_AUTO_INCREMENT;
	27
	28	msg[0].addr = client->addr;
	29	msg[0].flags = client->flags;
	30	msg[0].len = 1;
	31	msg[0].buf = &addr;
	32
	33	msg[1].addr = client->addr;
	34	msg[1].flags = client->flags \| I2C_M_RD;
	35	msg[1].len = len;
	36	msg[1].buf = data;
	37
	38	return i2c_transfer(client->adapter, msg, 2);
	39	}
	40
	41	static int hts221_i2c_write(struct device dev, u8 addr, int len, u8 data)
	42	{
	43	u8 send[len + 1];
	44	struct i2c_msg msg;
	45	struct i2c_client *client = to_i2c_client(dev);
	46
	47	if (len > 1)
	48	addr \|= I2C_AUTO_INCREMENT;
	49
	50	send[0] = addr;
	51	memcpy(&send[1], data, len * sizeof(u8));
	52
	53	msg.addr = client->addr;
	54	msg.flags = client->flags;
	55	msg.len = len + 1;
	56	msg.buf = send;
	57
	58	return i2c_transfer(client->adapter, &msg, 1);
	59	}
	60
	61	static const struct hts221_transfer_function hts221_transfer_fn = {
	62	.read = hts221_i2c_read,
	63	.write = hts221_i2c_write,
	64	};
	65
	66	static int hts221_i2c_probe(struct i2c_client *client,
	67	const struct i2c_device_id *id)
	68	{
	69	struct hts221_hw *hw;
	70	struct iio_dev *iio_dev;
	71
	72	iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*hw));
	73	if (!iio_dev)
	74	return -ENOMEM;
	75
	76	i2c_set_clientdata(client, iio_dev);
	77
78	hw = iio_priv(iio_dev);
79	hw->name = client->name;
80	hw->dev = &client->dev;
81	hw->irq = client->irq;
82	hw->tf = &hts221_transfer_fn;
83
84	return hts221_probe(iio_dev);
85	}
86
25fc503e SB	87	static const struct acpi_device_id hts221_acpi_match[] = {
	88	{"SMO9100", 0},
	89	{ },
	90	};
	91	MODULE_DEVICE_TABLE(acpi, hts221_acpi_match);
	92
e4a70e3e LB	93	static const struct of_device_id hts221_i2c_of_match[] = {
	94	{ .compatible = "st,hts221", },
	95	{},
	96	};
	97	MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);
	98
	99	static const struct i2c_device_id hts221_i2c_id_table[] = {
	100	{ HTS221_DEV_NAME },
	101	{},
	102	};
	103	MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
	104
	105	static struct i2c_driver hts221_driver = {
	106	.driver = {
	107	.name = "hts221_i2c",
b7079eea	108	.pm = &hts221_pm_ops,
e4a70e3e	109	.of_match_table = of_match_ptr(hts221_i2c_of_match),
25fc503e	110	.acpi_match_table = ACPI_PTR(hts221_acpi_match),
e4a70e3e LB	111	},
	112	.probe = hts221_i2c_probe,
	113	.id_table = hts221_i2c_id_table,
	114	};
	115	module_i2c_driver(hts221_driver);
	116
	117	MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
	118	MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
	119	MODULE_LICENSE("GPL v2");