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		.of_match_table = adau1372_of_match,
51	},
52	.probe = adau1372_spi_probe,
53	.id_table = adau1372_spi_id,
54};
55module_spi_driver(adau1372_spi_driver);
56
57MODULE_DESCRIPTION("ASoC ADAU1372 CODEC SPI driver");
58MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
59MODULE_LICENSE("GPL v2");