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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adau1781-spi.c (1936B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Driver for ADAU1381/ADAU1781 CODEC
      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/spi/spi.h>
     13#include <sound/soc.h>
     14
     15#include "adau1781.h"
     16
     17static void adau1781_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 adau1781_spi_probe(struct spi_device *spi)
     31{
     32	const struct spi_device_id *id = spi_get_device_id(spi);
     33	struct regmap_config config;
     34
     35	if (!id)
     36		return -EINVAL;
     37
     38	config = adau1781_regmap_config;
     39	config.val_bits = 8;
     40	config.reg_bits = 24;
     41	config.read_flag_mask = 0x1;
     42
     43	return adau1781_probe(&spi->dev,
     44		devm_regmap_init_spi(spi, &config),
     45		id->driver_data, adau1781_spi_switch_mode);
     46}
     47
     48static void adau1781_spi_remove(struct spi_device *spi)
     49{
     50	adau17x1_remove(&spi->dev);
     51}
     52
     53static const struct spi_device_id adau1781_spi_id[] = {
     54	{ "adau1381", ADAU1381 },
     55	{ "adau1781", ADAU1781 },
     56	{ }
     57};
     58MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
     59
     60#if defined(CONFIG_OF)
     61static const struct of_device_id adau1781_spi_dt_ids[] = {
     62	{ .compatible = "adi,adau1381", },
     63	{ .compatible = "adi,adau1781", },
     64	{ },
     65};
     66MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
     67#endif
     68
     69static struct spi_driver adau1781_spi_driver = {
     70	.driver = {
     71		.name = "adau1781",
     72		.of_match_table = of_match_ptr(adau1781_spi_dt_ids),
     73	},
     74	.probe = adau1781_spi_probe,
     75	.remove = adau1781_spi_remove,
     76	.id_table = adau1781_spi_id,
     77};
     78module_spi_driver(adau1781_spi_driver);
     79
     80MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
     81MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
     82MODULE_LICENSE("GPL");