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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adau1372-spi.c (1342B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Driver for ADAU1372 codec
      4 *
      5 * Copyright 2016 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/spi/spi.h>
     13#include <sound/soc.h>
     14
     15#include "adau1372.h"
     16
     17static void adau1372_spi_switch_mode(struct device *dev)
     18{
     19	struct spi_device *spi = to_spi_device(dev);
     20
     21	/*
     22	 * To get the device into SPI mode CLATCH has to be pulled low three
     23	 * times.  Do this by issuing three dummy reads.
     24	 */
     25	spi_w8r8(spi, 0x00);
     26	spi_w8r8(spi, 0x00);
     27	spi_w8r8(spi, 0x00);
     28}
     29
     30static int adau1372_spi_probe(struct spi_device *spi)
     31{
     32	struct regmap_config config;
     33
     34	config = adau1372_regmap_config;
     35	config.read_flag_mask = 0x1;
     36
     37	return adau1372_probe(&spi->dev,
     38		devm_regmap_init_spi(spi, &config), adau1372_spi_switch_mode);
     39}
     40
     41static const struct spi_device_id adau1372_spi_id[] = {
     42	{ "adau1372", 0 },
     43	{ }
     44};
     45MODULE_DEVICE_TABLE(spi, adau1372_spi_id);
     46
     47static struct spi_driver adau1372_spi_driver = {
     48	.driver = {
     49		.name = "adau1372",
     50	},
     51	.probe = adau1372_spi_probe,
     52	.id_table = adau1372_spi_id,
     53};
     54module_spi_driver(adau1372_spi_driver);
     55
     56MODULE_DESCRIPTION("ASoC ADAU1372 CODEC SPI driver");
     57MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
     58MODULE_LICENSE("GPL v2");