LXR linux/drivers/misc/ad525x

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Driver for the Analog Devices digital potentiometers (SPI bus)
   4 *
   5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   6 */
   7
   8#include <linux/spi/spi.h>
   9#include <linux/module.h>
  10
  11#include "ad525x_dpot.h"
  12
  13/* SPI bus functions */
  14static int write8(void *client, u8 val)
  15{
  16        u8 data = val;
  17
  18        return spi_write(client, &data, 1);
  19}
  20
  21static int write16(void *client, u8 reg, u8 val)
  22{
  23        u8 data[2] = {reg, val};
  24
  25        return spi_write(client, data, 2);
  26}
  27
  28static int write24(void *client, u8 reg, u16 val)
  29{
  30        u8 data[3] = {reg, val >> 8, val};
  31
  32        return spi_write(client, data, 3);
  33}
  34
  35static int read8(void *client)
  36{
  37        int ret;
  38        u8 data;
  39
  40        ret = spi_read(client, &data, 1);
  41        if (ret < 0)
  42                return ret;
  43
  44        return data;
  45}
  46
  47static int read16(void *client, u8 reg)
  48{
  49        int ret;
  50        u8 buf_rx[2];
  51
  52        write16(client, reg, 0);
  53        ret = spi_read(client, buf_rx, 2);
  54        if (ret < 0)
  55                return ret;
  56
  57        return (buf_rx[0] << 8) |  buf_rx[1];
  58}
  59
  60static int read24(void *client, u8 reg)
  61{
  62        int ret;
  63        u8 buf_rx[3];
  64
  65        write24(client, reg, 0);
  66        ret = spi_read(client, buf_rx, 3);
  67        if (ret < 0)
  68                return ret;
  69
  70        return (buf_rx[1] << 8) |  buf_rx[2];
  71}
  72
  73static const struct ad_dpot_bus_ops bops = {
  74        .read_d8        = read8,
  75        .read_r8d8      = read16,
  76        .read_r8d16     = read24,
  77        .write_d8       = write8,
  78        .write_r8d8     = write16,
  79        .write_r8d16    = write24,
  80};
  81static int ad_dpot_spi_probe(struct spi_device *spi)
  82{
  83        struct ad_dpot_bus_data bdata = {
  84                .client = spi,
  85                .bops = &bops,
  86        };
  87
  88        return ad_dpot_probe(&spi->dev, &bdata,
  89                             spi_get_device_id(spi)->driver_data,
  90                             spi_get_device_id(spi)->name);
  91}
  92
  93static int ad_dpot_spi_remove(struct spi_device *spi)
  94{
  95        return ad_dpot_remove(&spi->dev);
  96}
  97
  98static const struct spi_device_id ad_dpot_spi_id[] = {
  99        {"ad5160", AD5160_ID},
 100        {"ad5161", AD5161_ID},
 101        {"ad5162", AD5162_ID},
 102        {"ad5165", AD5165_ID},
 103        {"ad5200", AD5200_ID},
 104        {"ad5201", AD5201_ID},
 105        {"ad5203", AD5203_ID},
 106        {"ad5204", AD5204_ID},
 107        {"ad5206", AD5206_ID},
 108        {"ad5207", AD5207_ID},
 109        {"ad5231", AD5231_ID},
 110        {"ad5232", AD5232_ID},
 111        {"ad5233", AD5233_ID},
 112        {"ad5235", AD5235_ID},
 113        {"ad5260", AD5260_ID},
 114        {"ad5262", AD5262_ID},
 115        {"ad5263", AD5263_ID},
 116        {"ad5290", AD5290_ID},
 117        {"ad5291", AD5291_ID},
 118        {"ad5292", AD5292_ID},
 119        {"ad5293", AD5293_ID},
 120        {"ad7376", AD7376_ID},
 121        {"ad8400", AD8400_ID},
 122        {"ad8402", AD8402_ID},
 123        {"ad8403", AD8403_ID},
 124        {"adn2850", ADN2850_ID},
 125        {"ad5270", AD5270_ID},
 126        {"ad5271", AD5271_ID},
 127        {}
 128};
 129MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
 130
 131static struct spi_driver ad_dpot_spi_driver = {
 132        .driver = {
 133                .name   = "ad_dpot",
 134        },
 135        .probe          = ad_dpot_spi_probe,
 136        .remove         = ad_dpot_spi_remove,
 137        .id_table       = ad_dpot_spi_id,
 138};
 139
 140module_spi_driver(ad_dpot_spi_driver);
 141
 142MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 143MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
 144MODULE_LICENSE("GPL");
 145MODULE_ALIAS("spi:ad_dpot");
 146