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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | /* * 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 "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)); ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV); if (ret < 0) return ret; usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); ret = ms5611_i2c_read_adc(st, temp); if (ret < 0) return ret; ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV); if (ret < 0) return ret; usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); 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 -ENODEV; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); if (!indio_dev) return -ENOMEM; st = iio_priv(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); } static const struct i2c_device_id ms5611_id[] = { { "ms5611", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, ms5611_id); static struct i2c_driver ms5611_driver = { .driver = { .name = "ms5611", .owner = THIS_MODULE, }, .id_table = ms5611_id, .probe = ms5611_i2c_probe, }; module_i2c_driver(ms5611_driver); MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); MODULE_DESCRIPTION("MS5611 i2c driver"); MODULE_LICENSE("GPL v2"); |