/* * 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");