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
  15 static 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
  42 static 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
  75 static 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
  83 static int ad5686_spi_remove(struct spi_device *spi)
  84 {
  85         return ad5686_remove(&spi->dev);
  86 }
  87
  88 static 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 };
 104 MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
 105
 106 static 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
 115 module_spi_driver(ad5686_spi_driver);
 116
 117 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
 118 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
 119 MODULE_LICENSE("GPL v2");