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
  16 static 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
  49 static 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
  90 static 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
  98 static int ad5686_spi_remove(struct spi_device *spi)
  99 {
 100         return ad5686_remove(&spi->dev);
 101 }
 102
 103 static 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 };
 122 MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
 123
 124 static 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
 133 module_spi_driver(ad5686_spi_driver);
 134
 135 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
 136 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
 137 MODULE_LICENSE("GPL v2");