LXR linux/drivers/iio/magnetometer/hmc5843

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * SPI driver for hmc5983
   4 *
   5 * Copyright (C) Josef Gajdusek <atx@atx.name>
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/spi/spi.h>
  10#include <linux/iio/iio.h>
  11
  12#include "hmc5843.h"
  13
  14static const struct regmap_range hmc5843_readable_ranges[] = {
  15                regmap_reg_range(0, HMC5843_ID_END),
  16};
  17
  18static const struct regmap_access_table hmc5843_readable_table = {
  19                .yes_ranges = hmc5843_readable_ranges,
  20                .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
  21};
  22
  23static const struct regmap_range hmc5843_writable_ranges[] = {
  24                regmap_reg_range(0, HMC5843_MODE_REG),
  25};
  26
  27static const struct regmap_access_table hmc5843_writable_table = {
  28                .yes_ranges = hmc5843_writable_ranges,
  29                .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
  30};
  31
  32static const struct regmap_range hmc5843_volatile_ranges[] = {
  33                regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
  34};
  35
  36static const struct regmap_access_table hmc5843_volatile_table = {
  37                .yes_ranges = hmc5843_volatile_ranges,
  38                .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
  39};
  40
  41static const struct regmap_config hmc5843_spi_regmap_config = {
  42                .reg_bits = 8,
  43                .val_bits = 8,
  44
  45                .rd_table = &hmc5843_readable_table,
  46                .wr_table = &hmc5843_writable_table,
  47                .volatile_table = &hmc5843_volatile_table,
  48
  49                /* Autoincrement address pointer */
  50                .read_flag_mask = 0xc0,
  51
  52                .cache_type = REGCACHE_RBTREE,
  53};
  54
  55static int hmc5843_spi_probe(struct spi_device *spi)
  56{
  57        int ret;
  58        struct regmap *regmap;
  59        const struct spi_device_id *id = spi_get_device_id(spi);
  60
  61        spi->mode = SPI_MODE_3;
  62        spi->max_speed_hz = 8000000;
  63        spi->bits_per_word = 8;
  64        ret = spi_setup(spi);
  65        if (ret)
  66                return ret;
  67
  68        regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
  69        if (IS_ERR(regmap))
  70                return PTR_ERR(regmap);
  71
  72        return hmc5843_common_probe(&spi->dev,
  73                        regmap,
  74                        id->driver_data, id->name);
  75}
  76
  77static int hmc5843_spi_remove(struct spi_device *spi)
  78{
  79        return hmc5843_common_remove(&spi->dev);
  80}
  81
  82static const struct spi_device_id hmc5843_id[] = {
  83        { "hmc5983", HMC5983_ID },
  84        { }
  85};
  86MODULE_DEVICE_TABLE(spi, hmc5843_id);
  87
  88static struct spi_driver hmc5843_driver = {
  89                .driver = {
  90                                .name = "hmc5843",
  91                                .pm = HMC5843_PM_OPS,
  92                },
  93                .id_table = hmc5843_id,
  94                .probe = hmc5843_spi_probe,
  95                .remove = hmc5843_spi_remove,
  96};
  97
  98module_spi_driver(hmc5843_driver);
  99
 100MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
 101MODULE_DESCRIPTION("HMC5983 SPI driver");
 102MODULE_LICENSE("GPL");
 103