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 const struct spi_device_id adau1977_spi_ids[] = { 50 { "adau1977", ADAU1977 }, 51 { "adau1978", ADAU1978 }, 52 { "adau1979", ADAU1978 }, 53 { } 54 }; 55 MODULE_DEVICE_TABLE(spi, adau1977_spi_ids); 56 57 static struct spi_driver adau1977_spi_driver = { 58 .driver = { 59 .name = "adau1977", 60 }, 61 .probe = adau1977_spi_probe, 62 .id_table = adau1977_spi_ids, 63 }; 64 module_spi_driver(adau1977_spi_driver); 65 66 MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver"); 67 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 68 MODULE_LICENSE("GPL"); 69