f840cbed7a
Up to now ms5611_remove() returns zero unconditionally. Make it return void instead which makes it easier to see in the callers that there is no error to handle. Also the return value of i2c and spi remove callbacks is ignored anyway. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com> Link: https://lore.kernel.org/r/20211013203223.2694577-16-u.kleine-koenig@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MS5611 pressure and temperature sensor driver (I2C bus)
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*
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* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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*
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* 7-bit I2C slave addresses:
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*
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* 0x77 (CSB pin low)
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* 0x76 (CSB pin high)
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*
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <asm/unaligned.h>
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#include "ms5611.h"
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static int ms5611_i2c_reset(struct device *dev)
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{
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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return i2c_smbus_write_byte(st->client, MS5611_RESET);
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}
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static int ms5611_i2c_read_prom_word(struct device *dev, int index, u16 *word)
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{
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int ret;
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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ret = i2c_smbus_read_word_swapped(st->client,
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MS5611_READ_PROM_WORD + (index << 1));
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if (ret < 0)
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return ret;
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*word = ret;
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return 0;
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}
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static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
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{
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int ret;
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u8 buf[3];
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ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
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3, buf);
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if (ret < 0)
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return ret;
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*val = get_unaligned_be24(&buf[0]);
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return 0;
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}
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static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,
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s32 *temp, s32 *pressure)
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{
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int ret;
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struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
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const struct ms5611_osr *osr = st->temp_osr;
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ret = i2c_smbus_write_byte(st->client, osr->cmd);
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if (ret < 0)
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return ret;
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usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
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ret = ms5611_i2c_read_adc(st, temp);
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if (ret < 0)
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return ret;
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osr = st->pressure_osr;
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ret = i2c_smbus_write_byte(st->client, osr->cmd);
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if (ret < 0)
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return ret;
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usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
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return ms5611_i2c_read_adc(st, pressure);
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}
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static int ms5611_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ms5611_state *st;
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struct iio_dev *indio_dev;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WRITE_BYTE |
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I2C_FUNC_SMBUS_READ_WORD_DATA |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK))
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return -EOPNOTSUPP;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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st->reset = ms5611_i2c_reset;
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st->read_prom_word = ms5611_i2c_read_prom_word;
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st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
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st->client = client;
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return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
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}
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static int ms5611_i2c_remove(struct i2c_client *client)
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{
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ms5611_remove(i2c_get_clientdata(client));
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return 0;
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}
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static const struct of_device_id ms5611_i2c_matches[] = {
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{ .compatible = "meas,ms5611" },
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{ .compatible = "meas,ms5607" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
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static const struct i2c_device_id ms5611_id[] = {
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{ "ms5611", MS5611 },
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{ "ms5607", MS5607 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ms5611_id);
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static struct i2c_driver ms5611_driver = {
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.driver = {
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.name = "ms5611",
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.of_match_table = ms5611_i2c_matches,
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},
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.id_table = ms5611_id,
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.probe = ms5611_i2c_probe,
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.remove = ms5611_i2c_remove,
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};
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module_i2c_driver(ms5611_driver);
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MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
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MODULE_DESCRIPTION("MS5611 i2c driver");
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MODULE_LICENSE("GPL v2");
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