1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R, 4 * AD5694, AD5694R, AD5695R, AD5696, AD5696R 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/i2c.h> 14 15 static int ad5686_i2c_read(struct ad5686_state *st, u8 addr) 16 { 17 struct i2c_client *i2c = to_i2c_client(st->dev); 18 struct i2c_msg msg[2] = { 19 { 20 .addr = i2c->addr, 21 .flags = i2c->flags, 22 .len = 3, 23 .buf = &st->data[0].d8[1], 24 }, 25 { 26 .addr = i2c->addr, 27 .flags = i2c->flags | I2C_M_RD, 28 .len = 2, 29 .buf = (char *)&st->data[0].d16, 30 }, 31 }; 32 int ret; 33 34 st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) | 35 AD5686_ADDR(addr) | 36 0x00); 37 38 ret = i2c_transfer(i2c->adapter, msg, 2); 39 if (ret < 0) 40 return ret; 41 42 return be16_to_cpu(st->data[0].d16); 43 } 44 45 static int ad5686_i2c_write(struct ad5686_state *st, 46 u8 cmd, u8 addr, u16 val) 47 { 48 struct i2c_client *i2c = to_i2c_client(st->dev); 49 int ret; 50 51 st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr) 52 | val); 53 54 ret = i2c_master_send(i2c, &st->data[0].d8[1], 3); 55 if (ret < 0) 56 return ret; 57 58 return (ret != 3) ? -EIO : 0; 59 } 60 61 static int ad5686_i2c_probe(struct i2c_client *i2c, 62 const struct i2c_device_id *id) 63 { 64 return ad5686_probe(&i2c->dev, id->driver_data, id->name, 65 ad5686_i2c_write, ad5686_i2c_read); 66 } 67 68 static int ad5686_i2c_remove(struct i2c_client *i2c) 69 { 70 return ad5686_remove(&i2c->dev); 71 } 72 73 static const struct i2c_device_id ad5686_i2c_id[] = { 74 {"ad5311r", ID_AD5311R}, 75 {"ad5671r", ID_AD5671R}, 76 {"ad5675r", ID_AD5675R}, 77 {"ad5691r", ID_AD5691R}, 78 {"ad5692r", ID_AD5692R}, 79 {"ad5693", ID_AD5693}, 80 {"ad5693r", ID_AD5693R}, 81 {"ad5694", ID_AD5694}, 82 {"ad5694r", ID_AD5694R}, 83 {"ad5695r", ID_AD5695R}, 84 {"ad5696", ID_AD5696}, 85 {"ad5696r", ID_AD5696R}, 86 {} 87 }; 88 MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id); 89 90 static struct i2c_driver ad5686_i2c_driver = { 91 .driver = { 92 .name = "ad5696", 93 }, 94 .probe = ad5686_i2c_probe, 95 .remove = ad5686_i2c_remove, 96 .id_table = ad5686_i2c_id, 97 }; 98 99 module_i2c_driver(ad5686_i2c_driver); 100 101 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); 102 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs"); 103 MODULE_LICENSE("GPL v2"); 104