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603597c9 LPC |
1 | /* |
2 | * ADAU1977/ADAU1978/ADAU1979 driver | |
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 "adau1977.h" | |
17 | ||
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 | ||
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 int adau1977_spi_remove(struct spi_device *spi) | |
50 | { | |
51 | snd_soc_unregister_codec(&spi->dev); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static const struct spi_device_id adau1977_spi_ids[] = { | |
56 | { "adau1977", ADAU1977 }, | |
57 | { "adau1978", ADAU1978 }, | |
58 | { "adau1979", ADAU1978 }, | |
59 | { } | |
60 | }; | |
61 | MODULE_DEVICE_TABLE(spi, adau1977_spi_ids); | |
62 | ||
63 | static struct spi_driver adau1977_spi_driver = { | |
64 | .driver = { | |
65 | .name = "adau1977", | |
66 | .owner = THIS_MODULE, | |
67 | }, | |
68 | .probe = adau1977_spi_probe, | |
69 | .remove = adau1977_spi_remove, | |
70 | .id_table = adau1977_spi_ids, | |
71 | }; | |
72 | module_spi_driver(adau1977_spi_driver); | |
73 | ||
74 | MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver"); | |
75 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
76 | MODULE_LICENSE("GPL"); |