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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adau1977-spi.c (1930B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * ADAU1977/ADAU1978/ADAU1979 driver
      4 *
      5 * Copyright 2014 Analog Devices Inc.
      6 *  Author: Lars-Peter Clausen <lars@metafoo.de>
      7 */
      8
      9#include <linux/mod_devicetable.h>
     10#include <linux/module.h>
     11#include <linux/regmap.h>
     12#include <linux/of.h>
     13#include <linux/of_device.h>
     14#include <linux/spi/spi.h>
     15#include <sound/soc.h>
     16
     17#include "adau1977.h"
     18
     19static void adau1977_spi_switch_mode(struct device *dev)
     20{
     21	struct spi_device *spi = to_spi_device(dev);
     22
     23	/*
     24	 * To get the device into SPI mode CLATCH has to be pulled low three
     25	 * times.  Do this by issuing three dummy reads.
     26	 */
     27	spi_w8r8(spi, 0x00);
     28	spi_w8r8(spi, 0x00);
     29	spi_w8r8(spi, 0x00);
     30}
     31
     32static int adau1977_spi_probe(struct spi_device *spi)
     33{
     34	const struct spi_device_id *id = spi_get_device_id(spi);
     35	struct regmap_config config;
     36
     37	if (!id)
     38		return -EINVAL;
     39
     40	config = adau1977_regmap_config;
     41	config.val_bits = 8;
     42	config.reg_bits = 16;
     43	config.read_flag_mask = 0x1;
     44
     45	return adau1977_probe(&spi->dev,
     46		devm_regmap_init_spi(spi, &config),
     47		id->driver_data, adau1977_spi_switch_mode);
     48}
     49
     50static const struct spi_device_id adau1977_spi_ids[] = {
     51	{ "adau1977", ADAU1977 },
     52	{ "adau1978", ADAU1978 },
     53	{ "adau1979", ADAU1978 },
     54	{ }
     55};
     56MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
     57
     58static const struct of_device_id adau1977_spi_of_match[] = {
     59        { .compatible = "adi,adau1977" },
     60        { .compatible = "adi,adau1978" },
     61        { .compatible = "adi,adau1979" },
     62        { },
     63};
     64MODULE_DEVICE_TABLE(of, adau1977_spi_of_match);
     65
     66static struct spi_driver adau1977_spi_driver = {
     67	.driver = {
     68		.name = "adau1977",
     69		.of_match_table = of_match_ptr(adau1977_spi_of_match),
     70	},
     71	.probe = adau1977_spi_probe,
     72	.id_table = adau1977_spi_ids,
     73};
     74module_spi_driver(adau1977_spi_driver);
     75
     76MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
     77MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
     78MODULE_LICENSE("GPL");