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PNI RM3100 is a high resolution, large signal immunity magnetometer,
composed of 3 single sensors and a processing chip with a MagI2C
interface.
Following functions are available:
- Single-shot measurement from
/sys/bus/iio/devices/iio:deviceX/in_magn_{axis}_raw
- Triggerd buffer measurement.
- DRDY pin for data ready trigger.
- Both i2c and spi interface are supported.
- Both interrupt and polling measurement is supported, depends on if
the 'interrupts' in DT is declared.
Signed-off-by: Song Qiang <songqiang1304521@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
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*
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* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include "rm3100.h"
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static const struct regmap_config rm3100_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.rd_table = &rm3100_readable_table,
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.wr_table = &rm3100_writable_table,
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.volatile_table = &rm3100_volatile_table,
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.read_flag_mask = 0x80,
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.cache_type = REGCACHE_RBTREE,
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};
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static int rm3100_probe(struct spi_device *spi)
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{
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struct regmap *regmap;
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int ret;
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/* Actually this device supports both mode 0 and mode 3. */
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spi->mode = SPI_MODE_0;
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/* Data rates cannot exceed 1Mbits. */
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spi->max_speed_hz = 1000000;
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spi->bits_per_word = 8;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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return rm3100_common_probe(&spi->dev, regmap, spi->irq);
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}
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static const struct of_device_id rm3100_dt_match[] = {
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{ .compatible = "pni,rm3100", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rm3100_dt_match);
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static struct spi_driver rm3100_driver = {
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.driver = {
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.name = "rm3100-spi",
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.of_match_table = rm3100_dt_match,
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},
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.probe = rm3100_probe,
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};
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module_spi_driver(rm3100_driver);
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MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
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MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
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MODULE_LICENSE("GPL v2");
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