Merge remote-tracking branches 'asoc/topic/rockchip', 'asoc/topic/rt5514', 'asoc...
[sfrench/cifs-2.6.git] / sound / soc / codecs / adau1781-spi.c
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
18 static 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
31 static 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
49 static int adau1781_spi_remove(struct spi_device *spi)
50 {
51         adau17x1_remove(&spi->dev);
52         return 0;
53 }
54
55 static const struct spi_device_id adau1781_spi_id[] = {
56         { "adau1381", ADAU1381 },
57         { "adau1781", ADAU1781 },
58         { }
59 };
60 MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
61
62 #if defined(CONFIG_OF)
63 static const struct of_device_id adau1781_spi_dt_ids[] = {
64         { .compatible = "adi,adau1381", },
65         { .compatible = "adi,adau1781", },
66         { },
67 };
68 MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
69 #endif
70
71 static 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 };
80 module_spi_driver(adau1781_spi_driver);
81
82 MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
83 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
84 MODULE_LICENSE("GPL");