Tomasz Duszynski | c064416 | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 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> |
| 20 | |
| 21 | #include "ms5611.h" |
| 22 | |
| 23 | static int ms5611_i2c_reset(struct device *dev) |
| 24 | { |
| 25 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); |
| 26 | |
| 27 | return i2c_smbus_write_byte(st->client, MS5611_RESET); |
| 28 | } |
| 29 | |
| 30 | static int ms5611_i2c_read_prom_word(struct device *dev, int index, u16 *word) |
| 31 | { |
| 32 | int ret; |
| 33 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); |
| 34 | |
| 35 | ret = i2c_smbus_read_word_swapped(st->client, |
| 36 | MS5611_READ_PROM_WORD + (index << 1)); |
| 37 | if (ret < 0) |
| 38 | return ret; |
| 39 | |
| 40 | *word = ret; |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val) |
| 46 | { |
| 47 | int ret; |
| 48 | u8 buf[3]; |
| 49 | |
| 50 | ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC, |
| 51 | 3, buf); |
| 52 | if (ret < 0) |
| 53 | return ret; |
| 54 | |
| 55 | *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev, |
| 61 | s32 *temp, s32 *pressure) |
| 62 | { |
| 63 | int ret; |
| 64 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); |
| 65 | |
| 66 | ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV); |
| 67 | if (ret < 0) |
| 68 | return ret; |
| 69 | |
| 70 | usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); |
| 71 | |
| 72 | ret = ms5611_i2c_read_adc(st, temp); |
| 73 | if (ret < 0) |
| 74 | return ret; |
| 75 | |
| 76 | ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV); |
| 77 | if (ret < 0) |
| 78 | return ret; |
| 79 | |
| 80 | usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); |
| 81 | |
| 82 | return ms5611_i2c_read_adc(st, pressure); |
| 83 | } |
| 84 | |
| 85 | static int ms5611_i2c_probe(struct i2c_client *client, |
| 86 | const struct i2c_device_id *id) |
| 87 | { |
| 88 | struct ms5611_state *st; |
| 89 | struct iio_dev *indio_dev; |
| 90 | |
| 91 | if (!i2c_check_functionality(client->adapter, |
| 92 | I2C_FUNC_SMBUS_WRITE_BYTE | |
| 93 | I2C_FUNC_SMBUS_READ_WORD_DATA | |
| 94 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) |
| 95 | return -ENODEV; |
| 96 | |
| 97 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); |
| 98 | if (!indio_dev) |
| 99 | return -ENOMEM; |
| 100 | |
| 101 | st = iio_priv(indio_dev); |
| 102 | st->reset = ms5611_i2c_reset; |
| 103 | st->read_prom_word = ms5611_i2c_read_prom_word; |
| 104 | st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure; |
| 105 | st->client = client; |
| 106 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 107 | return ms5611_probe(indio_dev, &client->dev, id->driver_data); |
Tomasz Duszynski | c064416 | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | static const struct i2c_device_id ms5611_id[] = { |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 111 | { "ms5611", MS5611 }, |
| 112 | { "ms5607", MS5607 }, |
Tomasz Duszynski | c064416 | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 113 | { } |
| 114 | }; |
| 115 | MODULE_DEVICE_TABLE(i2c, ms5611_id); |
| 116 | |
| 117 | static struct i2c_driver ms5611_driver = { |
| 118 | .driver = { |
| 119 | .name = "ms5611", |
Tomasz Duszynski | c064416 | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 120 | }, |
| 121 | .id_table = ms5611_id, |
| 122 | .probe = ms5611_i2c_probe, |
| 123 | }; |
| 124 | module_i2c_driver(ms5611_driver); |
| 125 | |
| 126 | MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); |
| 127 | MODULE_DESCRIPTION("MS5611 i2c driver"); |
| 128 | MODULE_LICENSE("GPL v2"); |