| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * ADAU1977/ADAU1978/ADAU1979 driver |
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| 4 | * |
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| 5 | * Copyright 2014 Analog Devices Inc. |
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| 6 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
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| 7 | */ |
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| 8 | |
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| 9 | #include <linux/mod_devicetable.h> |
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| 10 | #include <linux/module.h> |
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| 11 | #include <linux/regmap.h> |
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| 12 | #include <linux/of.h> |
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| 13 | #include <linux/spi/spi.h> |
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| 14 | #include <sound/soc.h> |
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| 15 | |
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| 16 | #include "adau1977.h" |
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| 17 | |
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| 18 | static void adau1977_spi_switch_mode(struct device *dev) |
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| 19 | { |
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| 20 | struct spi_device *spi = to_spi_device(dev); |
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| 21 | |
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| 22 | /* |
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| 23 | * To get the device into SPI mode CLATCH has to be pulled low three |
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| 24 | * times. Do this by issuing three dummy reads. |
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| 25 | */ |
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| 26 | spi_w8r8(spi, cmd: 0x00); |
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| 27 | spi_w8r8(spi, cmd: 0x00); |
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| 28 | spi_w8r8(spi, cmd: 0x00); |
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| 29 | } |
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| 30 | |
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| 31 | static int adau1977_spi_probe(struct spi_device *spi) |
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| 32 | { |
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| 33 | const struct spi_device_id *id = spi_get_device_id(sdev: spi); |
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| 34 | struct regmap_config config; |
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| 35 | |
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| 36 | if (!id) |
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| 37 | return -EINVAL; |
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| 38 | |
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| 39 | config = adau1977_regmap_config; |
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| 40 | config.val_bits = 8; |
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| 41 | config.reg_bits = 16; |
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| 42 | config.read_flag_mask = 0x1; |
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| 43 | |
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| 44 | return adau1977_probe(dev: &spi->dev, |
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| 45 | devm_regmap_init_spi(spi, &config), |
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| 46 | type: id->driver_data, switch_mode: adau1977_spi_switch_mode); |
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| 47 | } |
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| 48 | |
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| 49 | static const struct spi_device_id adau1977_spi_ids[] = { |
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| 50 | { "adau1977" , ADAU1977 }, |
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| 51 | { "adau1978" , ADAU1978 }, |
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| 52 | { "adau1979" , ADAU1978 }, |
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| 53 | { } |
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| 54 | }; |
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| 55 | MODULE_DEVICE_TABLE(spi, adau1977_spi_ids); |
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| 56 | |
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| 57 | static const struct of_device_id adau1977_spi_of_match[] __maybe_unused = { |
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| 58 | { .compatible = "adi,adau1977" }, |
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| 59 | { .compatible = "adi,adau1978" }, |
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| 60 | { .compatible = "adi,adau1979" }, |
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| 61 | { }, |
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| 62 | }; |
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| 63 | MODULE_DEVICE_TABLE(of, adau1977_spi_of_match); |
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| 64 | |
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| 65 | static struct spi_driver adau1977_spi_driver = { |
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| 66 | .driver = { |
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| 67 | .name = "adau1977" , |
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| 68 | .of_match_table = of_match_ptr(adau1977_spi_of_match), |
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| 69 | }, |
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| 70 | .probe = adau1977_spi_probe, |
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| 71 | .id_table = adau1977_spi_ids, |
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| 72 | }; |
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| 73 | module_spi_driver(adau1977_spi_driver); |
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| 74 | |
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| 75 | MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver" ); |
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| 76 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>" ); |
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| 77 | MODULE_LICENSE("GPL" ); |
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| 78 | |
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