LXR linux/drivers/iio/dac/ad5686-spi.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * AD5672R, AD5674R, AD5676, AD5676R, AD5679R,
   4 * AD5681R, AD5682R, AD5683, AD5683R, AD5684,
   5 * AD5684R, AD5685R, AD5686, AD5686R
   6 * Digital to analog converters driver
   7 *
   8 * Copyright 2018 Analog Devices Inc.
   9 */
  10
  11#include "ad5686.h"
  12
  13#include <linux/module.h>
  14#include <linux/spi/spi.h>
  15
  16static int ad5686_spi_write(struct ad5686_state *st,
  17                            u8 cmd, u8 addr, u16 val)
  18{
  19        struct spi_device *spi = to_spi_device(st->dev);
  20        u8 tx_len, *buf;
  21
  22        switch (st->chip_info->regmap_type) {
  23        case AD5310_REGMAP:
  24                st->data[0].d16 = cpu_to_be16(AD5310_CMD(cmd) |
  25                                              val);
  26                buf = &st->data[0].d8[0];
  27                tx_len = 2;
  28                break;
  29        case AD5683_REGMAP:
  30                st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  31                                              AD5683_DATA(val));
  32                buf = &st->data[0].d8[1];
  33                tx_len = 3;
  34                break;
  35        case AD5686_REGMAP:
  36                st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  37                                              AD5686_ADDR(addr) |
  38                                              val);
  39                buf = &st->data[0].d8[1];
  40                tx_len = 3;
  41                break;
  42        default:
  43                return -EINVAL;
  44        }
  45
  46        return spi_write(spi, buf, tx_len);
  47}
  48
  49static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
  50{
  51        struct spi_transfer t[] = {
  52                {
  53                        .tx_buf = &st->data[0].d8[1],
  54                        .len = 3,
  55                        .cs_change = 1,
  56                }, {
  57                        .tx_buf = &st->data[1].d8[1],
  58                        .rx_buf = &st->data[2].d8[1],
  59                        .len = 3,
  60                },
  61        };
  62        struct spi_device *spi = to_spi_device(st->dev);
  63        u8 cmd = 0;
  64        int ret;
  65
  66        switch (st->chip_info->regmap_type) {
  67        case AD5310_REGMAP:
  68                return -ENOTSUPP;
  69        case AD5683_REGMAP:
  70                cmd = AD5686_CMD_READBACK_ENABLE_V2;
  71                break;
  72        case AD5686_REGMAP:
  73                cmd = AD5686_CMD_READBACK_ENABLE;
  74                break;
  75        default:
  76                return -EINVAL;
  77        }
  78
  79        st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  80                                      AD5686_ADDR(addr));
  81        st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
  82
  83        ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
  84        if (ret < 0)
  85                return ret;
  86
  87        return be32_to_cpu(st->data[2].d32);
  88}
  89
  90static int ad5686_spi_probe(struct spi_device *spi)
  91{
  92        const struct spi_device_id *id = spi_get_device_id(spi);
  93
  94        return ad5686_probe(&spi->dev, id->driver_data, id->name,
  95                            ad5686_spi_write, ad5686_spi_read);
  96}
  97
  98static int ad5686_spi_remove(struct spi_device *spi)
  99{
 100        return ad5686_remove(&spi->dev);
 101}
 102
 103static const struct spi_device_id ad5686_spi_id[] = {
 104        {"ad5310r", ID_AD5310R},
 105        {"ad5672r", ID_AD5672R},
 106        {"ad5674r", ID_AD5674R},
 107        {"ad5676", ID_AD5676},
 108        {"ad5676r", ID_AD5676R},
 109        {"ad5679r", ID_AD5679R},
 110        {"ad5681r", ID_AD5681R},
 111        {"ad5682r", ID_AD5682R},
 112        {"ad5683", ID_AD5683},
 113        {"ad5683r", ID_AD5683R},
 114        {"ad5684", ID_AD5684},
 115        {"ad5684r", ID_AD5684R},
 116        {"ad5685", ID_AD5685R}, /* Does not exist */
 117        {"ad5685r", ID_AD5685R},
 118        {"ad5686", ID_AD5686},
 119        {"ad5686r", ID_AD5686R},
 120        {}
 121};
 122MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
 123
 124static struct spi_driver ad5686_spi_driver = {
 125        .driver = {
 126                .name = "ad5686",
 127        },
 128        .probe = ad5686_spi_probe,
 129        .remove = ad5686_spi_remove,
 130        .id_table = ad5686_spi_id,
 131};
 132
 133module_spi_driver(ad5686_spi_driver);
 134
 135MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
 136MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
 137MODULE_LICENSE("GPL v2");
 138