tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
18static 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
31static 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
49static const struct spi_device_id adau1977_spi_ids[] = {
50 { "adau1977", ADAU1977 },
51 { "adau1978", ADAU1978 },
52 { "adau1979", ADAU1978 },
53 { }
54};
55MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
56
57static struct spi_driver adau1977_spi_driver = {
58 .driver = {
59 .name = "adau1977",
60 },
61 .probe = adau1977_spi_probe,
62 .id_table = adau1977_spi_ids,
63};
64module_spi_driver(adau1977_spi_driver);
65
66MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
67MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
68MODULE_LICENSE("GPL");