hmc5843_spi.c

  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	ret = spi_setup(spi);
 64	if (ret)
 65		return ret;
 66
 67	regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
 68	if (IS_ERR(regmap))
 69		return PTR_ERR(regmap);
 70
 71	return hmc5843_common_probe(&spi->dev,
 72			regmap,
 73			id->driver_data, id->name);
 74}
 75
 76static void hmc5843_spi_remove(struct spi_device *spi)
 77{
 78	hmc5843_common_remove(&spi->dev);
 79}
 80
 81static const struct spi_device_id hmc5843_id[] = {
 82	{ "hmc5983", HMC5983_ID },
 83	{ }
 84};
 85MODULE_DEVICE_TABLE(spi, hmc5843_id);
 86
 87static struct spi_driver hmc5843_driver = {
 88	.driver = {
 89		.name = "hmc5843",
 90		.pm = pm_sleep_ptr(&hmc5843_pm_ops),
 91	},
 92	.id_table = hmc5843_id,
 93	.probe = hmc5843_spi_probe,
 94	.remove = hmc5843_spi_remove,
 95};
 96
 97module_spi_driver(hmc5843_driver);
 98
 99MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
100MODULE_DESCRIPTION("HMC5983 SPI driver");
101MODULE_LICENSE("GPL");
102MODULE_IMPORT_NS("IIO_HMC5843");