2 * MS5611 pressure and temperature sensor driver (I2C bus)
4 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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.
10 * 7-bit I2C slave addresses:
17 #include <linux/delay.h>
18 #include <linux/i2c.h>
19 #include <linux/module.h>
20 #include <linux/of_device.h>
24 static int ms5611_i2c_reset(struct ms5611_state *st)
26 return i2c_smbus_write_byte(st->client, MS5611_RESET);
29 static int ms5611_i2c_read_prom_word(struct ms5611_state *st, int index,
34 ret = i2c_smbus_read_word_swapped(st->client,
35 MS5611_READ_PROM_WORD + (index << 1));
44 static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
49 ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
54 *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
59 static int ms5611_i2c_read_adc_temp_and_pressure(struct ms5611_state *st,
60 s32 *temp, s32 *pressure)
63 const struct ms5611_osr *osr = st->temp_osr;
65 ret = i2c_smbus_write_byte(st->client, osr->cmd);
69 usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
70 ret = ms5611_i2c_read_adc(st, temp);
74 osr = st->pressure_osr;
75 ret = i2c_smbus_write_byte(st->client, osr->cmd);
79 usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
80 return ms5611_i2c_read_adc(st, pressure);
83 static int ms5611_i2c_probe(struct i2c_client *client,
84 const struct i2c_device_id *id)
86 struct ms5611_state *st;
87 struct iio_dev *indio_dev;
89 if (!i2c_check_functionality(client->adapter,
90 I2C_FUNC_SMBUS_WRITE_BYTE |
91 I2C_FUNC_SMBUS_READ_WORD_DATA |
92 I2C_FUNC_SMBUS_READ_I2C_BLOCK))
95 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
99 st = iio_priv(indio_dev);
100 i2c_set_clientdata(client, indio_dev);
101 st->reset = ms5611_i2c_reset;
102 st->read_prom_word = ms5611_i2c_read_prom_word;
103 st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
106 return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
109 static int ms5611_i2c_remove(struct i2c_client *client)
111 return ms5611_remove(i2c_get_clientdata(client));
114 #if defined(CONFIG_OF)
115 static const struct of_device_id ms5611_i2c_matches[] = {
116 { .compatible = "meas,ms5611" },
117 { .compatible = "ms5611" },
118 { .compatible = "meas,ms5607" },
119 { .compatible = "ms5607" },
122 MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
125 static const struct i2c_device_id ms5611_id[] = {
126 { "ms5611", MS5611 },
127 { "ms5607", MS5607 },
130 MODULE_DEVICE_TABLE(i2c, ms5611_id);
132 static struct i2c_driver ms5611_driver = {
135 .of_match_table = of_match_ptr(ms5611_i2c_matches)
137 .id_table = ms5611_id,
138 .probe = ms5611_i2c_probe,
139 .remove = ms5611_i2c_remove,
141 module_i2c_driver(ms5611_driver);
143 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
144 MODULE_DESCRIPTION("MS5611 i2c driver");
145 MODULE_LICENSE("GPL v2");