LXR linux/drivers/iio/magnetometer/rm3100-spi.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
   4 *
   5 * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/spi/spi.h>
  10
  11#include "rm3100.h"
  12
  13static const struct regmap_config rm3100_regmap_config = {
  14        .reg_bits = 8,
  15        .val_bits = 8,
  16
  17        .rd_table = &rm3100_readable_table,
  18        .wr_table = &rm3100_writable_table,
  19        .volatile_table = &rm3100_volatile_table,
  20
  21        .read_flag_mask = 0x80,
  22
  23        .cache_type = REGCACHE_RBTREE,
  24};
  25
  26static int rm3100_probe(struct spi_device *spi)
  27{
  28        struct regmap *regmap;
  29        int ret;
  30
  31        /* Actually this device supports both mode 0 and mode 3. */
  32        spi->mode = SPI_MODE_0;
  33        /* Data rates cannot exceed 1Mbits. */
  34        spi->max_speed_hz = 1000000;
  35        spi->bits_per_word = 8;
  36        ret = spi_setup(spi);
  37        if (ret)
  38                return ret;
  39
  40        regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
  41        if (IS_ERR(regmap))
  42                return PTR_ERR(regmap);
  43
  44        return rm3100_common_probe(&spi->dev, regmap, spi->irq);
  45}
  46
  47static const struct of_device_id rm3100_dt_match[] = {
  48        { .compatible = "pni,rm3100", },
  49        { }
  50};
  51MODULE_DEVICE_TABLE(of, rm3100_dt_match);
  52
  53static struct spi_driver rm3100_driver = {
  54        .driver = {
  55                .name = "rm3100-spi",
  56                .of_match_table = rm3100_dt_match,
  57        },
  58        .probe = rm3100_probe,
  59};
  60module_spi_driver(rm3100_driver);
  61
  62MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
  63MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
  64MODULE_LICENSE("GPL v2");
  65