1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * ADAU1977/ADAU1978/ADAU1979 driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2014 Analog Devices Inc.
6*4882a593Smuzhiyun * Author: Lars-Peter Clausen <lars@metafoo.de>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/regmap.h>
12*4882a593Smuzhiyun #include <linux/of.h>
13*4882a593Smuzhiyun #include <linux/of_device.h>
14*4882a593Smuzhiyun #include <linux/spi/spi.h>
15*4882a593Smuzhiyun #include <sound/soc.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include "adau1977.h"
18*4882a593Smuzhiyun
adau1977_spi_switch_mode(struct device * dev)19*4882a593Smuzhiyun static void adau1977_spi_switch_mode(struct device *dev)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct spi_device *spi = to_spi_device(dev);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun /*
24*4882a593Smuzhiyun * To get the device into SPI mode CLATCH has to be pulled low three
25*4882a593Smuzhiyun * times. Do this by issuing three dummy reads.
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun spi_w8r8(spi, 0x00);
28*4882a593Smuzhiyun spi_w8r8(spi, 0x00);
29*4882a593Smuzhiyun spi_w8r8(spi, 0x00);
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
adau1977_spi_probe(struct spi_device * spi)32*4882a593Smuzhiyun static int adau1977_spi_probe(struct spi_device *spi)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun const struct spi_device_id *id = spi_get_device_id(spi);
35*4882a593Smuzhiyun struct regmap_config config;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (!id)
38*4882a593Smuzhiyun return -EINVAL;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun config = adau1977_regmap_config;
41*4882a593Smuzhiyun config.val_bits = 8;
42*4882a593Smuzhiyun config.reg_bits = 16;
43*4882a593Smuzhiyun config.read_flag_mask = 0x1;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun return adau1977_probe(&spi->dev,
46*4882a593Smuzhiyun devm_regmap_init_spi(spi, &config),
47*4882a593Smuzhiyun id->driver_data, adau1977_spi_switch_mode);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun static const struct spi_device_id adau1977_spi_ids[] = {
51*4882a593Smuzhiyun { "adau1977", ADAU1977 },
52*4882a593Smuzhiyun { "adau1978", ADAU1978 },
53*4882a593Smuzhiyun { "adau1979", ADAU1978 },
54*4882a593Smuzhiyun { }
55*4882a593Smuzhiyun };
56*4882a593Smuzhiyun MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun static const struct of_device_id adau1977_spi_of_match[] = {
59*4882a593Smuzhiyun { .compatible = "adi,adau1977" },
60*4882a593Smuzhiyun { .compatible = "adi,adau1978" },
61*4882a593Smuzhiyun { .compatible = "adi,adau1979" },
62*4882a593Smuzhiyun { },
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, adau1977_spi_of_match);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static struct spi_driver adau1977_spi_driver = {
67*4882a593Smuzhiyun .driver = {
68*4882a593Smuzhiyun .name = "adau1977",
69*4882a593Smuzhiyun .of_match_table = of_match_ptr(adau1977_spi_of_match),
70*4882a593Smuzhiyun },
71*4882a593Smuzhiyun .probe = adau1977_spi_probe,
72*4882a593Smuzhiyun .id_table = adau1977_spi_ids,
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun module_spi_driver(adau1977_spi_driver);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
77*4882a593Smuzhiyun MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
78*4882a593Smuzhiyun MODULE_LICENSE("GPL");
79