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

   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
  15static 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 AD5683_REGMAP:
  23                st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  24                                              AD5683_DATA(val));
  25                buf = &st->data[0].d8[1];
  26                tx_len = 3;
  27                break;
  28        case AD5686_REGMAP:
  29                st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  30                                              AD5686_ADDR(addr) |
  31                                              val);
  32                buf = &st->data[0].d8[1];
  33                tx_len = 3;
  34                break;
  35        default:
  36                return -EINVAL;
  37        }
  38
  39        return spi_write(spi, buf, tx_len);
  40}
  41
  42static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
  43{
  44        struct spi_transfer t[] = {
  45                {
  46                        .tx_buf = &st->data[0].d8[1],
  47                        .len = 3,
  48                        .cs_change = 1,
  49                }, {
  50                        .tx_buf = &st->data[1].d8[1],
  51                        .rx_buf = &st->data[2].d8[1],
  52                        .len = 3,
  53                },
  54        };
  55        struct spi_device *spi = to_spi_device(st->dev);
  56        u8 cmd = 0;
  57        int ret;
  58
  59        if (st->chip_info->regmap_type == AD5686_REGMAP)
  60                cmd = AD5686_CMD_READBACK_ENABLE;
  61        else if (st->chip_info->regmap_type == AD5683_REGMAP)
  62                cmd = AD5686_CMD_READBACK_ENABLE_V2;
  63
  64        st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
  65                                      AD5686_ADDR(addr));
  66        st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
  67
  68        ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
  69        if (ret < 0)
  70                return ret;
  71
  72        return be32_to_cpu(st->data[2].d32);
  73}
  74
  75static int ad5686_spi_probe(struct spi_device *spi)
  76{
  77        const struct spi_device_id *id = spi_get_device_id(spi);
  78
  79        return ad5686_probe(&spi->dev, id->driver_data, id->name,
  80                            ad5686_spi_write, ad5686_spi_read);
  81}
  82
  83static int ad5686_spi_remove(struct spi_device *spi)
  84{
  85        return ad5686_remove(&spi->dev);
  86}
  87
  88static const struct spi_device_id ad5686_spi_id[] = {
  89        {"ad5672r", ID_AD5672R},
  90        {"ad5676", ID_AD5676},
  91        {"ad5676r", ID_AD5676R},
  92        {"ad5681r", ID_AD5681R},
  93        {"ad5682r", ID_AD5682R},
  94        {"ad5683", ID_AD5683},
  95        {"ad5683r", ID_AD5683R},
  96        {"ad5684", ID_AD5684},
  97        {"ad5684r", ID_AD5684R},
  98        {"ad5685", ID_AD5685R}, /* Does not exist */
  99        {"ad5685r", ID_AD5685R},
 100        {"ad5686", ID_AD5686},
 101        {"ad5686r", ID_AD5686R},
 102        {}
 103};
 104MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
 105
 106static struct spi_driver ad5686_spi_driver = {
 107        .driver = {
 108                .name = "ad5686",
 109        },
 110        .probe = ad5686_spi_probe,
 111        .remove = ad5686_spi_remove,
 112        .id_table = ad5686_spi_id,
 113};
 114
 115module_spi_driver(ad5686_spi_driver);
 116
 117MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
 118MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
 119MODULE_LICENSE("GPL v2");
 120