[deliverable/linux.git] / drivers / iio / pressure / ms5611_i2c.c

/*
 * MS5611 pressure and temperature sensor driver (I2C bus)
 *
 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 7-bit I2C slave addresses:
 *
 * 0x77 (CSB pin low)
 * 0x76 (CSB pin high)
 *
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>

#include "ms5611.h"

static int ms5611_i2c_reset(struct device *dev)
{
	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

	return i2c_smbus_write_byte(st->client, MS5611_RESET);
}

static int ms5611_i2c_read_prom_word(struct device *dev, int index, u16 *word)
{
	int ret;
	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

	ret = i2c_smbus_read_word_swapped(st->client,
			MS5611_READ_PROM_WORD + (index << 1));
	if (ret < 0)
		return ret;

	*word = ret;

	return 0;
}

static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
{
	int ret;
	u8 buf[3];

	ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
					    3, buf);
	if (ret < 0)
		return ret;

	*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];

	return 0;
}

static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,
						 s32 *temp, s32 *pressure)
{
	int ret;
	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
	const struct ms5611_osr *osr = st->temp_osr;

	ret = i2c_smbus_write_byte(st->client, osr->cmd);
	if (ret < 0)
		return ret;

	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
	ret = ms5611_i2c_read_adc(st, temp);
	if (ret < 0)
		return ret;

	osr = st->pressure_osr;
	ret = i2c_smbus_write_byte(st->client, osr->cmd);
	if (ret < 0)
		return ret;

	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
	return ms5611_i2c_read_adc(st, pressure);
}

static int ms5611_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct ms5611_state *st;
	struct iio_dev *indio_dev;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_WRITE_BYTE |
				     I2C_FUNC_SMBUS_READ_WORD_DATA |
				     I2C_FUNC_SMBUS_READ_I2C_BLOCK))
		return -EOPNOTSUPP;

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

	st = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	st->reset = ms5611_i2c_reset;
	st->read_prom_word = ms5611_i2c_read_prom_word;
	st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
	st->client = client;

	return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
}

static int ms5611_i2c_remove(struct i2c_client *client)
{
	return ms5611_remove(i2c_get_clientdata(client));
}

#if defined(CONFIG_OF)
static const struct of_device_id ms5611_i2c_matches[] = {
	{ .compatible = "meas,ms5611" },
	{ .compatible = "ms5611" },
	{ .compatible = "meas,ms5607" },
	{ .compatible = "ms5607" },
	{ }
};
MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
#endif

static const struct i2c_device_id ms5611_id[] = {
	{ "ms5611", MS5611 },
	{ "ms5607", MS5607 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ms5611_id);

static struct i2c_driver ms5611_driver = {
	.driver = {
		.name = "ms5611",
		.of_match_table = of_match_ptr(ms5611_i2c_matches)
	},
	.id_table = ms5611_id,
	.probe = ms5611_i2c_probe,
	.remove = ms5611_i2c_remove,
};
module_i2c_driver(ms5611_driver);

MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
MODULE_DESCRIPTION("MS5611 i2c driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
c0644160 TD	1	/*
	2	* MS5611 pressure and temperature sensor driver (I2C bus)
	3	*
	4	* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* 7-bit I2C slave addresses:
	11	*
	12	* 0x77 (CSB pin low)
	13	* 0x76 (CSB pin high)
	14	*
	15	*/
	16
	17	#include <linux/delay.h>
	18	#include <linux/i2c.h>
	19	#include <linux/module.h>
7a948c5e	20	#include <linux/of_device.h>
c0644160 TD	21
	22	#include "ms5611.h"
	23
	24	static int ms5611_i2c_reset(struct device *dev)
	25	{
	26	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
	27
	28	return i2c_smbus_write_byte(st->client, MS5611_RESET);
	29	}
	30
	31	static int ms5611_i2c_read_prom_word(struct device dev, int index, u16 word)
	32	{
	33	int ret;
	34	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
	35
	36	ret = i2c_smbus_read_word_swapped(st->client,
	37	MS5611_READ_PROM_WORD + (index << 1));
	38	if (ret < 0)
	39	return ret;
	40
	41	*word = ret;
	42
	43	return 0;
	44	}
	45
	46	static int ms5611_i2c_read_adc(struct ms5611_state st, s32 val)
	47	{
	48	int ret;
	49	u8 buf[3];
	50
	51	ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
	52	3, buf);
	53	if (ret < 0)
	54	return ret;
	55
	56	*val = (buf[0] << 16) \| (buf[1] << 8) \| buf[2];
	57
	58	return 0;
	59	}
	60
	61	static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,
	62	s32 temp, s32 pressure)
	63	{
	64	int ret;
	65	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
033691a9	66	const struct ms5611_osr *osr = st->temp_osr;
c0644160	67
033691a9	68	ret = i2c_smbus_write_byte(st->client, osr->cmd);
c0644160 TD	69	if (ret < 0)
	70	return ret;
	71
033691a9	72	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
c0644160 TD	73	ret = ms5611_i2c_read_adc(st, temp);
	74	if (ret < 0)
	75	return ret;
	76
033691a9 GB	77	osr = st->pressure_osr;
033691a9 GB	78	ret = i2c_smbus_write_byte(st->client, osr->cmd);
c0644160 TD	79	if (ret < 0)
	80	return ret;
	81
033691a9	82	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
c0644160 TD	83	return ms5611_i2c_read_adc(st, pressure);
	84	}
	85
	86	static int ms5611_i2c_probe(struct i2c_client *client,
	87	const struct i2c_device_id *id)
	88	{
	89	struct ms5611_state *st;
	90	struct iio_dev *indio_dev;
	91
	92	if (!i2c_check_functionality(client->adapter,
	93	I2C_FUNC_SMBUS_WRITE_BYTE \|
	94	I2C_FUNC_SMBUS_READ_WORD_DATA \|
	95	I2C_FUNC_SMBUS_READ_I2C_BLOCK))
f8d9d3b4	96	return -EOPNOTSUPP;
c0644160 TD	97
	98	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
	99	if (!indio_dev)
	100	return -ENOMEM;
	101
	102	st = iio_priv(indio_dev);
713bbb4e	103	i2c_set_clientdata(client, indio_dev);
c0644160 TD	104	st->reset = ms5611_i2c_reset;
	105	st->read_prom_word = ms5611_i2c_read_prom_word;
	106	st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
	107	st->client = client;
	108
eac635eb	109	return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
c0644160 TD	110	}
c0644160 TD	111
713bbb4e DB	112	static int ms5611_i2c_remove(struct i2c_client *client)
	113	{
	114	return ms5611_remove(i2c_get_clientdata(client));
	115	}
	116
7a948c5e GB	117	#if defined(CONFIG_OF)
	118	static const struct of_device_id ms5611_i2c_matches[] = {
	119	{ .compatible = "meas,ms5611" },
	120	{ .compatible = "ms5611" },
	121	{ .compatible = "meas,ms5607" },
	122	{ .compatible = "ms5607" },
	123	{ }
	124	};
	125	MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
	126	#endif
	127
c0644160	128	static const struct i2c_device_id ms5611_id[] = {
9690d81a TD	129	{ "ms5611", MS5611 },
9690d81a TD	130	{ "ms5607", MS5607 },
c0644160 TD	131	{ }
	132	};
	133	MODULE_DEVICE_TABLE(i2c, ms5611_id);
	134
	135	static struct i2c_driver ms5611_driver = {
	136	.driver = {
	137	.name = "ms5611",
7a948c5e	138	.of_match_table = of_match_ptr(ms5611_i2c_matches)
c0644160 TD	139	},
	140	.id_table = ms5611_id,
	141	.probe = ms5611_i2c_probe,
713bbb4e	142	.remove = ms5611_i2c_remove,
c0644160 TD	143	};
	144	module_i2c_driver(ms5611_driver);
	145
	146	MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
	147	MODULE_DESCRIPTION("MS5611 i2c driver");
	148	MODULE_LICENSE("GPL v2");