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");
83