1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ADAU1977/ADAU1978/ADAU1979 driver 4 * 5 * Copyright 2014 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/of.h> 13 #include <linux/of_device.h> 14 #include <linux/spi/spi.h> 15 #include <sound/soc.h> 16 17 #include "adau1977.h" 18 19 static void adau1977_spi_switch_mode(struct device *dev) 20 { 21 struct spi_device *spi = to_spi_device(dev); 22 23 /* 24 * To get the device into SPI mode CLATCH has to be pulled low three 25 * times. Do this by issuing three dummy reads. 26 */ 27 spi_w8r8(spi, 0x00); 28 spi_w8r8(spi, 0x00); 29 spi_w8r8(spi, 0x00); 30 } 31 32 static int adau1977_spi_probe(struct spi_device *spi) 33 { 34 const struct spi_device_id *id = spi_get_device_id(spi); 35 struct regmap_config config; 36 37 if (!id) 38 return -EINVAL; 39 40 config = adau1977_regmap_config; 41 config.val_bits = 8; 42 config.reg_bits = 16; 43 config.read_flag_mask = 0x1; 44 45 return adau1977_probe(&spi->dev, 46 devm_regmap_init_spi(spi, &config), 47 id->driver_data, adau1977_spi_switch_mode); 48 } 49 50 static const struct spi_device_id adau1977_spi_ids[] = { 51 { "adau1977", ADAU1977 }, 52 { "adau1978", ADAU1978 }, 53 { "adau1979", ADAU1978 }, 54 { } 55 }; 56 MODULE_DEVICE_TABLE(spi, adau1977_spi_ids); 57 58 static const struct of_device_id adau1977_spi_of_match[] = { 59 { .compatible = "adi,adau1977" }, 60 { .compatible = "adi,adau1978" }, 61 { .compatible = "adi,adau1979" }, 62 { }, 63 }; 64 MODULE_DEVICE_TABLE(of, adau1977_spi_of_match); 65 66 static struct spi_driver adau1977_spi_driver = { 67 .driver = { 68 .name = "adau1977", 69 .of_match_table = of_match_ptr(adau1977_spi_of_match), 70 }, 71 .probe = adau1977_spi_probe, 72 .id_table = adau1977_spi_ids, 73 }; 74 module_spi_driver(adau1977_spi_driver); 75 76 MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver"); 77 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 78 MODULE_LICENSE("GPL"); 79