LXR linux/drivers/misc/ad525x

   1/*
   2 * Driver for the Analog Devices digital potentiometers (I2C bus)
   3 *
   4 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later.
   7 */
   8
   9#include <linux/i2c.h>
  10#include <linux/module.h>
  11
  12#include "ad525x_dpot.h"
  13
  14/* I2C bus functions */
  15static int write_d8(void *client, u8 val)
  16{
  17        return i2c_smbus_write_byte(client, val);
  18}
  19
  20static int write_r8d8(void *client, u8 reg, u8 val)
  21{
  22        return i2c_smbus_write_byte_data(client, reg, val);
  23}
  24
  25static int write_r8d16(void *client, u8 reg, u16 val)
  26{
  27        return i2c_smbus_write_word_data(client, reg, val);
  28}
  29
  30static int read_d8(void *client)
  31{
  32        return i2c_smbus_read_byte(client);
  33}
  34
  35static int read_r8d8(void *client, u8 reg)
  36{
  37        return i2c_smbus_read_byte_data(client, reg);
  38}
  39
  40static int read_r8d16(void *client, u8 reg)
  41{
  42        return i2c_smbus_read_word_data(client, reg);
  43}
  44
  45static const struct ad_dpot_bus_ops bops = {
  46        .read_d8        = read_d8,
  47        .read_r8d8      = read_r8d8,
  48        .read_r8d16     = read_r8d16,
  49        .write_d8       = write_d8,
  50        .write_r8d8     = write_r8d8,
  51        .write_r8d16    = write_r8d16,
  52};
  53
  54static int ad_dpot_i2c_probe(struct i2c_client *client,
  55                                      const struct i2c_device_id *id)
  56{
  57        struct ad_dpot_bus_data bdata = {
  58                .client = client,
  59                .bops = &bops,
  60        };
  61
  62        if (!i2c_check_functionality(client->adapter,
  63                                     I2C_FUNC_SMBUS_WORD_DATA)) {
  64                dev_err(&client->dev, "SMBUS Word Data not Supported\n");
  65                return -EIO;
  66        }
  67
  68        return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name);
  69}
  70
  71static int ad_dpot_i2c_remove(struct i2c_client *client)
  72{
  73        return ad_dpot_remove(&client->dev);
  74}
  75
  76static const struct i2c_device_id ad_dpot_id[] = {
  77        {"ad5258", AD5258_ID},
  78        {"ad5259", AD5259_ID},
  79        {"ad5251", AD5251_ID},
  80        {"ad5252", AD5252_ID},
  81        {"ad5253", AD5253_ID},
  82        {"ad5254", AD5254_ID},
  83        {"ad5255", AD5255_ID},
  84        {"ad5241", AD5241_ID},
  85        {"ad5242", AD5242_ID},
  86        {"ad5243", AD5243_ID},
  87        {"ad5245", AD5245_ID},
  88        {"ad5246", AD5246_ID},
  89        {"ad5247", AD5247_ID},
  90        {"ad5248", AD5248_ID},
  91        {"ad5280", AD5280_ID},
  92        {"ad5282", AD5282_ID},
  93        {"adn2860", ADN2860_ID},
  94        {"ad5273", AD5273_ID},
  95        {"ad5161", AD5161_ID},
  96        {"ad5171", AD5171_ID},
  97        {"ad5170", AD5170_ID},
  98        {"ad5172", AD5172_ID},
  99        {"ad5173", AD5173_ID},
 100        {"ad5272", AD5272_ID},
 101        {"ad5274", AD5274_ID},
 102        {}
 103};
 104MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
 105
 106static struct i2c_driver ad_dpot_i2c_driver = {
 107        .driver = {
 108                .name   = "ad_dpot",
 109                .owner  = THIS_MODULE,
 110        },
 111        .probe          = ad_dpot_i2c_probe,
 112        .remove         = ad_dpot_i2c_remove,
 113        .id_table       = ad_dpot_id,
 114};
 115
 116module_i2c_driver(ad_dpot_i2c_driver);
 117
 118MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 119MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
 120MODULE_LICENSE("GPL");
 121MODULE_ALIAS("i2c:ad_dpot");
 122