iio/dac/ad5696-i2c.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * AD5338R, AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693,
0004  * AD5693R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
0005  * Digital to analog converters driver
0006  *
0007  * Copyright 2018 Analog Devices Inc.
0008  */
0009
0010 #include "ad5686.h"
0011
0012 #include <linux/module.h>
0013 #include <linux/i2c.h>
0014
0015 static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
0016 {
0017     struct i2c_client *i2c = to_i2c_client(st->dev);
0018     struct i2c_msg msg[2] = {
0019         {
0020             .addr = i2c->addr,
0021             .flags = i2c->flags,
0022             .len = 3,
0023             .buf = &st->data[0].d8[1],
0024         },
0025         {
0026             .addr = i2c->addr,
0027             .flags = i2c->flags | I2C_M_RD,
0028             .len = 2,
0029             .buf = (char *)&st->data[0].d16,
0030         },
0031     };
0032     int ret;
0033
0034     st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
0035                       AD5686_ADDR(addr) |
0036                       0x00);
0037
0038     ret = i2c_transfer(i2c->adapter, msg, 2);
0039     if (ret < 0)
0040         return ret;
0041
0042     return be16_to_cpu(st->data[0].d16);
0043 }
0044
0045 static int ad5686_i2c_write(struct ad5686_state *st,
0046                 u8 cmd, u8 addr, u16 val)
0047 {
0048     struct i2c_client *i2c = to_i2c_client(st->dev);
0049     int ret;
0050
0051     st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
0052                       | val);
0053
0054     ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
0055     if (ret < 0)
0056         return ret;
0057
0058     return (ret != 3) ? -EIO : 0;
0059 }
0060
0061 static int ad5686_i2c_probe(struct i2c_client *i2c,
0062                 const struct i2c_device_id *id)
0063 {
0064     return ad5686_probe(&i2c->dev, id->driver_data, id->name,
0065                 ad5686_i2c_write, ad5686_i2c_read);
0066 }
0067
0068 static int ad5686_i2c_remove(struct i2c_client *i2c)
0069 {
0070     ad5686_remove(&i2c->dev);
0071
0072     return 0;
0073 }
0074
0075 static const struct i2c_device_id ad5686_i2c_id[] = {
0076     {"ad5311r", ID_AD5311R},
0077     {"ad5338r", ID_AD5338R},
0078     {"ad5671r", ID_AD5671R},
0079     {"ad5673r", ID_AD5673R},
0080     {"ad5675r", ID_AD5675R},
0081     {"ad5677r", ID_AD5677R},
0082     {"ad5691r", ID_AD5691R},
0083     {"ad5692r", ID_AD5692R},
0084     {"ad5693", ID_AD5693},
0085     {"ad5693r", ID_AD5693R},
0086     {"ad5694", ID_AD5694},
0087     {"ad5694r", ID_AD5694R},
0088     {"ad5695r", ID_AD5695R},
0089     {"ad5696", ID_AD5696},
0090     {"ad5696r", ID_AD5696R},
0091     {}
0092 };
0093 MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
0094
0095 static const struct of_device_id ad5686_of_match[] = {
0096     { .compatible = "adi,ad5311r" },
0097     { .compatible = "adi,ad5338r" },
0098     { .compatible = "adi,ad5671r" },
0099     { .compatible = "adi,ad5675r" },
0100     { .compatible = "adi,ad5691r" },
0101     { .compatible = "adi,ad5692r" },
0102     { .compatible = "adi,ad5693" },
0103     { .compatible = "adi,ad5693r" },
0104     { .compatible = "adi,ad5694" },
0105     { .compatible = "adi,ad5694r" },
0106     { .compatible = "adi,ad5695r" },
0107     { .compatible = "adi,ad5696" },
0108     { .compatible = "adi,ad5696r" },
0109     {}
0110 };
0111 MODULE_DEVICE_TABLE(of, ad5686_of_match);
0112
0113 static struct i2c_driver ad5686_i2c_driver = {
0114     .driver = {
0115         .name = "ad5696",
0116         .of_match_table = ad5686_of_match,
0117     },
0118     .probe = ad5686_i2c_probe,
0119     .remove = ad5686_i2c_remove,
0120     .id_table = ad5686_i2c_id,
0121 };
0122
0123 module_i2c_driver(ad5686_i2c_driver);
0124
0125 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
0126 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
0127 MODULE_LICENSE("GPL v2");
0128 MODULE_IMPORT_NS(IIO_AD5686);