cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hmc5843_spi.c (2481B)

      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 void hmc5843_spi_remove(struct spi_device *spi)
     78{
     79	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");
    103MODULE_IMPORT_NS(IIO_HMC5843);