1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * AD5672R, AD5676, AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R 4 * Digital to analog converters driver 5 * 6 * Copyright 2018 Analog Devices Inc. 7 */ 8 9 #include "ad5686.h" 10 11 #include <linux/module.h> 12 #include <linux/spi/spi.h> 13 14 static int ad5686_spi_write(struct ad5686_state *st, 15 u8 cmd, u8 addr, u16 val) 16 { 17 struct spi_device *spi = to_spi_device(st->dev); 18 19 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | 20 AD5686_ADDR(addr) | 21 val); 22 23 return spi_write(spi, &st->data[0].d8[1], 3); 24 } 25 26 static int ad5686_spi_read(struct ad5686_state *st, u8 addr) 27 { 28 struct spi_transfer t[] = { 29 { 30 .tx_buf = &st->data[0].d8[1], 31 .len = 3, 32 .cs_change = 1, 33 }, { 34 .tx_buf = &st->data[1].d8[1], 35 .rx_buf = &st->data[2].d8[1], 36 .len = 3, 37 }, 38 }; 39 struct spi_device *spi = to_spi_device(st->dev); 40 int ret; 41 42 st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) | 43 AD5686_ADDR(addr)); 44 st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP)); 45 46 ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t)); 47 if (ret < 0) 48 return ret; 49 50 return be32_to_cpu(st->data[2].d32); 51 } 52 53 static int ad5686_spi_probe(struct spi_device *spi) 54 { 55 const struct spi_device_id *id = spi_get_device_id(spi); 56 57 return ad5686_probe(&spi->dev, id->driver_data, id->name, 58 ad5686_spi_write, ad5686_spi_read); 59 } 60 61 static int ad5686_spi_remove(struct spi_device *spi) 62 { 63 return ad5686_remove(&spi->dev); 64 } 65 66 static const struct spi_device_id ad5686_spi_id[] = { 67 {"ad5672r", ID_AD5672R}, 68 {"ad5676", ID_AD5676}, 69 {"ad5676r", ID_AD5676R}, 70 {"ad5684", ID_AD5684}, 71 {"ad5684r", ID_AD5684R}, 72 {"ad5685", ID_AD5685R}, /* Does not exist */ 73 {"ad5685r", ID_AD5685R}, 74 {"ad5686", ID_AD5686}, 75 {"ad5686r", ID_AD5686R}, 76 {} 77 }; 78 MODULE_DEVICE_TABLE(spi, ad5686_spi_id); 79 80 static struct spi_driver ad5686_spi_driver = { 81 .driver = { 82 .name = "ad5686", 83 }, 84 .probe = ad5686_spi_probe, 85 .remove = ad5686_spi_remove, 86 .id_table = ad5686_spi_id, 87 }; 88 89 module_spi_driver(ad5686_spi_driver); 90 91 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); 92 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs"); 93 MODULE_LICENSE("GPL v2"); 94