1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for ADAU1381/ADAU1781 CODEC 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/spi/spi.h> 13 #include <sound/soc.h> 14 15 #include "adau1781.h" 16 17 static void adau1781_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, 0x00); 26 spi_w8r8(spi, 0x00); 27 spi_w8r8(spi, 0x00); 28 } 29 30 static int adau1781_spi_probe(struct spi_device *spi) 31 { 32 const struct spi_device_id *id = spi_get_device_id(spi); 33 struct regmap_config config; 34 35 if (!id) 36 return -EINVAL; 37 38 config = adau1781_regmap_config; 39 config.val_bits = 8; 40 config.reg_bits = 24; 41 config.read_flag_mask = 0x1; 42 43 return adau1781_probe(&spi->dev, 44 devm_regmap_init_spi(spi, &config), 45 id->driver_data, adau1781_spi_switch_mode); 46 } 47 48 static int adau1781_spi_remove(struct spi_device *spi) 49 { 50 adau17x1_remove(&spi->dev); 51 return 0; 52 } 53 54 static const struct spi_device_id adau1781_spi_id[] = { 55 { "adau1381", ADAU1381 }, 56 { "adau1781", ADAU1781 }, 57 { } 58 }; 59 MODULE_DEVICE_TABLE(spi, adau1781_spi_id); 60 61 #if defined(CONFIG_OF) 62 static const struct of_device_id adau1781_spi_dt_ids[] = { 63 { .compatible = "adi,adau1381", }, 64 { .compatible = "adi,adau1781", }, 65 { }, 66 }; 67 MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids); 68 #endif 69 70 static struct spi_driver adau1781_spi_driver = { 71 .driver = { 72 .name = "adau1781", 73 .of_match_table = of_match_ptr(adau1781_spi_dt_ids), 74 }, 75 .probe = adau1781_spi_probe, 76 .remove = adau1781_spi_remove, 77 .id_table = adau1781_spi_id, 78 }; 79 module_spi_driver(adau1781_spi_driver); 80 81 MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver"); 82 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 83 MODULE_LICENSE("GPL"); 84