tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for ADAU1381/ADAU1781 CODEC
3 *
4 * Copyright 2014 Analog Devices Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Licensed under the GPL-2.
8 */
9
10#include <linux/mod_devicetable.h>
11#include <linux/module.h>
12#include <linux/regmap.h>
13#include <linux/spi/spi.h>
14#include <sound/soc.h>
15
16#include "adau1781.h"
17
18static void adau1781_spi_switch_mode(struct device *dev)
19{
20 struct spi_device *spi = to_spi_device(dev);
21
22 /*
23 * To get the device into SPI mode CLATCH has to be pulled low three
24 * times. Do this by issuing three dummy reads.
25 */
26 spi_w8r8(spi, 0x00);
27 spi_w8r8(spi, 0x00);
28 spi_w8r8(spi, 0x00);
29}
30
31static int adau1781_spi_probe(struct spi_device *spi)
32{
33 const struct spi_device_id *id = spi_get_device_id(spi);
34 struct regmap_config config;
35
36 if (!id)
37 return -EINVAL;
38
39 config = adau1781_regmap_config;
40 config.val_bits = 8;
41 config.reg_bits = 24;
42 config.read_flag_mask = 0x1;
43
44 return adau1781_probe(&spi->dev,
45 devm_regmap_init_spi(spi, &config),
46 id->driver_data, adau1781_spi_switch_mode);
47}
48
49static int adau1781_spi_remove(struct spi_device *spi)
50{
51 adau17x1_remove(&spi->dev);
52 return 0;
53}
54
55static const struct spi_device_id adau1781_spi_id[] = {
56 { "adau1381", ADAU1381 },
57 { "adau1781", ADAU1781 },
58 { }
59};
60MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
61
62#if defined(CONFIG_OF)
63static const struct of_device_id adau1781_spi_dt_ids[] = {
64 { .compatible = "adi,adau1381", },
65 { .compatible = "adi,adau1781", },
66 { },
67};
68MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
69#endif
70
71static struct spi_driver adau1781_spi_driver = {
72 .driver = {
73 .name = "adau1781",
74 .of_match_table = of_match_ptr(adau1781_spi_dt_ids),
75 },
76 .probe = adau1781_spi_probe,
77 .remove = adau1781_spi_remove,
78 .id_table = adau1781_spi_id,
79};
80module_spi_driver(adau1781_spi_driver);
81
82MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
83MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
84MODULE_LICENSE("GPL");