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
adau1781_spi_switch_mode(struct device * dev)17 static 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
adau1781_spi_probe(struct spi_device * spi)30 static 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
adau1781_spi_remove(struct spi_device * spi)48 static void adau1781_spi_remove(struct spi_device *spi)
49 {
50 adau17x1_remove(&spi->dev);
51 }
52
53 static const struct spi_device_id adau1781_spi_id[] = {
54 { "adau1381", ADAU1381 },
55 { "adau1781", ADAU1781 },
56 { }
57 };
58 MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
59
60 #if defined(CONFIG_OF)
61 static const struct of_device_id adau1781_spi_dt_ids[] = {
62 { .compatible = "adi,adau1381", },
63 { .compatible = "adi,adau1781", },
64 { },
65 };
66 MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
67 #endif
68
69 static 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 };
78 module_spi_driver(adau1781_spi_driver);
79
80 MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
81 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
82 MODULE_LICENSE("GPL");
83