1 // SPDX-License-Identifier: GPL-2.0
3 * MS5611 pressure and temperature sensor driver (I2C bus)
5 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
7 * 7-bit I2C slave addresses:
14 #include <linux/delay.h>
15 #include <linux/i2c.h>
16 #include <linux/module.h>
17 #include <linux/mod_devicetable.h>
19 #include <asm/unaligned.h>
23 static int ms5611_i2c_reset(struct ms5611_state *st)
25 return i2c_smbus_write_byte(st->client, MS5611_RESET);
28 static int ms5611_i2c_read_prom_word(struct ms5611_state *st, int index,
33 ret = i2c_smbus_read_word_swapped(st->client,
34 MS5611_READ_PROM_WORD + (index << 1));
43 static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
48 ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
53 *val = get_unaligned_be24(&buf[0]);
58 static int ms5611_i2c_read_adc_temp_and_pressure(struct ms5611_state *st,
59 s32 *temp, s32 *pressure)
62 const struct ms5611_osr *osr = st->temp_osr;
64 ret = i2c_smbus_write_byte(st->client, osr->cmd);
68 usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
69 ret = ms5611_i2c_read_adc(st, temp);
73 osr = st->pressure_osr;
74 ret = i2c_smbus_write_byte(st->client, osr->cmd);
78 usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
79 return ms5611_i2c_read_adc(st, pressure);
82 static int ms5611_i2c_probe(struct i2c_client *client)
84 const struct i2c_device_id *id = i2c_client_get_device_id(client);
85 struct ms5611_state *st;
86 struct iio_dev *indio_dev;
88 if (!i2c_check_functionality(client->adapter,
89 I2C_FUNC_SMBUS_WRITE_BYTE |
90 I2C_FUNC_SMBUS_READ_WORD_DATA |
91 I2C_FUNC_SMBUS_READ_I2C_BLOCK))
94 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
98 st = iio_priv(indio_dev);
99 i2c_set_clientdata(client, indio_dev);
100 st->reset = ms5611_i2c_reset;
101 st->read_prom_word = ms5611_i2c_read_prom_word;
102 st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
105 return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
108 static const struct of_device_id ms5611_i2c_matches[] = {
109 { .compatible = "meas,ms5611" },
110 { .compatible = "meas,ms5607" },
113 MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
115 static const struct i2c_device_id ms5611_id[] = {
116 { "ms5611", MS5611 },
117 { "ms5607", MS5607 },
120 MODULE_DEVICE_TABLE(i2c, ms5611_id);
122 static struct i2c_driver ms5611_driver = {
125 .of_match_table = ms5611_i2c_matches,
127 .id_table = ms5611_id,
128 .probe = ms5611_i2c_probe,
130 module_i2c_driver(ms5611_driver);
132 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
133 MODULE_DESCRIPTION("MS5611 i2c driver");
134 MODULE_LICENSE("GPL v2");
135 MODULE_IMPORT_NS(IIO_MS5611);