1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for ADAU1372 codec |
4 | * |
5 | * Copyright 2016 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 "adau1372.h" |
16 | |
17 | static void adau1372_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, cmd: 0x00); |
26 | spi_w8r8(spi, cmd: 0x00); |
27 | spi_w8r8(spi, cmd: 0x00); |
28 | } |
29 | |
30 | static int adau1372_spi_probe(struct spi_device *spi) |
31 | { |
32 | struct regmap_config config; |
33 | |
34 | config = adau1372_regmap_config; |
35 | config.read_flag_mask = 0x1; |
36 | |
37 | return adau1372_probe(dev: &spi->dev, |
38 | devm_regmap_init_spi(spi, &config), switch_mode: adau1372_spi_switch_mode); |
39 | } |
40 | |
41 | static const struct spi_device_id adau1372_spi_id[] = { |
42 | { "adau1372" , 0 }, |
43 | { } |
44 | }; |
45 | MODULE_DEVICE_TABLE(spi, adau1372_spi_id); |
46 | |
47 | static struct spi_driver adau1372_spi_driver = { |
48 | .driver = { |
49 | .name = "adau1372" , |
50 | }, |
51 | .probe = adau1372_spi_probe, |
52 | .id_table = adau1372_spi_id, |
53 | }; |
54 | module_spi_driver(adau1372_spi_driver); |
55 | |
56 | MODULE_DESCRIPTION("ASoC ADAU1372 CODEC SPI driver" ); |
57 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>" ); |
58 | MODULE_LICENSE("GPL v2" ); |
59 | |