projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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", | |
| 603597c9 LPC |
66 | }, |
| 67 | .probe = adau1977_spi_probe, | |
| 68 | .remove = adau1977_spi_remove, | |
| 69 | .id_table = adau1977_spi_ids, | |
| 70 | }; | |
| 71 | module_spi_driver(adau1977_spi_driver); | |
| 72 | ||
| 73 | MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver"); | |
| 74 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
| 75 | MODULE_LICENSE("GPL"); |