1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R, 4 * AD5684, AD5684R, AD5685R, AD5686, AD5686R 5 * Digital to analog converters driver 6 * 7 * Copyright 2018 Analog Devices Inc. 8 */ 9 10 #include "ad5686.h" 11 12 #include <linux/module.h> 13 #include <linux/spi/spi.h> 14 15 static int ad5686_spi_write(struct ad5686_state *st, 16 u8 cmd, u8 addr, u16 val) 17 { 18 struct spi_device *spi = to_spi_device(st->dev); 19 u8 tx_len, *buf; 20 21 switch (st->chip_info->regmap_type) { 22 case AD5310_REGMAP: 23 st->data[0].d16 = cpu_to_be16(AD5310_CMD(cmd) | 24 val); 25 buf = &st->data[0].d8[0]; 26 tx_len = 2; 27 break; 28 case AD5683_REGMAP: 29 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | 30 AD5683_DATA(val)); 31 buf = &st->data[0].d8[1]; 32 tx_len = 3; 33 break; 34 case AD5686_REGMAP: 35 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | 36 AD5686_ADDR(addr) | 37 val); 38 buf = &st->data[0].d8[1]; 39 tx_len = 3; 40 break; 41 default: 42 return -EINVAL; 43 } 44 45 return spi_write(spi, buf, tx_len); 46 } 47 48 static int ad5686_spi_read(struct ad5686_state *st, u8 addr) 49 { 50 struct spi_transfer t[] = { 51 { 52 .tx_buf = &st->data[0].d8[1], 53 .len = 3, 54 .cs_change = 1, 55 }, { 56 .tx_buf = &st->data[1].d8[1], 57 .rx_buf = &st->data[2].d8[1], 58 .len = 3, 59 }, 60 }; 61 struct spi_device *spi = to_spi_device(st->dev); 62 u8 cmd = 0; 63 int ret; 64 65 switch (st->chip_info->regmap_type) { 66 case AD5310_REGMAP: 67 return -ENOTSUPP; 68 case AD5683_REGMAP: 69 cmd = AD5686_CMD_READBACK_ENABLE_V2; 70 break; 71 case AD5686_REGMAP: 72 cmd = AD5686_CMD_READBACK_ENABLE; 73 break; 74 default: 75 return -EINVAL; 76 } 77 78 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | 79 AD5686_ADDR(addr)); 80 st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP)); 81 82 ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t)); 83 if (ret < 0) 84 return ret; 85 86 return be32_to_cpu(st->data[2].d32); 87 } 88 89 static int ad5686_spi_probe(struct spi_device *spi) 90 { 91 const struct spi_device_id *id = spi_get_device_id(spi); 92 93 return ad5686_probe(&spi->dev, id->driver_data, id->name, 94 ad5686_spi_write, ad5686_spi_read); 95 } 96 97 static int ad5686_spi_remove(struct spi_device *spi) 98 { 99 return ad5686_remove(&spi->dev); 100 } 101 102 static const struct spi_device_id ad5686_spi_id[] = { 103 {"ad5310r", ID_AD5310R}, 104 {"ad5672r", ID_AD5672R}, 105 {"ad5676", ID_AD5676}, 106 {"ad5676r", ID_AD5676R}, 107 {"ad5681r", ID_AD5681R}, 108 {"ad5682r", ID_AD5682R}, 109 {"ad5683", ID_AD5683}, 110 {"ad5683r", ID_AD5683R}, 111 {"ad5684", ID_AD5684}, 112 {"ad5684r", ID_AD5684R}, 113 {"ad5685", ID_AD5685R}, /* Does not exist */ 114 {"ad5685r", ID_AD5685R}, 115 {"ad5686", ID_AD5686}, 116 {"ad5686r", ID_AD5686R}, 117 {} 118 }; 119 MODULE_DEVICE_TABLE(spi, ad5686_spi_id); 120 121 static struct spi_driver ad5686_spi_driver = { 122 .driver = { 123 .name = "ad5686", 124 }, 125 .probe = ad5686_spi_probe, 126 .remove = ad5686_spi_remove, 127 .id_table = ad5686_spi_id, 128 }; 129 130 module_spi_driver(ad5686_spi_driver); 131 132 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); 133 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs"); 134 MODULE_LICENSE("GPL v2"); 135