1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ADAU1977/ADAU1978/ADAU1979 driver
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/of.h>
13 #include <linux/spi/spi.h>
14 #include <sound/soc.h>
15
16 #include "adau1977.h"
17
adau1977_spi_switch_mode(struct device * dev)18 static void adau1977_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
adau1977_spi_probe(struct spi_device * spi)31 static int adau1977_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 = adau1977_regmap_config;
40 config.val_bits = 8;
41 config.reg_bits = 16;
42 config.read_flag_mask = 0x1;
43
44 return adau1977_probe(&spi->dev,
45 devm_regmap_init_spi(spi, &config),
46 id->driver_data, adau1977_spi_switch_mode);
47 }
48
49 static const struct spi_device_id adau1977_spi_ids[] = {
50 { "adau1977", ADAU1977 },
51 { "adau1978", ADAU1978 },
52 { "adau1979", ADAU1978 },
53 { }
54 };
55 MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
56
57 static const struct of_device_id adau1977_spi_of_match[] __maybe_unused = {
58 { .compatible = "adi,adau1977" },
59 { .compatible = "adi,adau1978" },
60 { .compatible = "adi,adau1979" },
61 { },
62 };
63 MODULE_DEVICE_TABLE(of, adau1977_spi_of_match);
64
65 static struct spi_driver adau1977_spi_driver = {
66 .driver = {
67 .name = "adau1977",
68 .of_match_table = of_match_ptr(adau1977_spi_of_match),
69 },
70 .probe = adau1977_spi_probe,
71 .id_table = adau1977_spi_ids,
72 };
73 module_spi_driver(adau1977_spi_driver);
74
75 MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
76 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
77 MODULE_LICENSE("GPL");
78