drivers/misc/ad525x_dpot-i2c.c

   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 */
  15 static int write_d8(void *client, u8 val)
  16 {
  17         return i2c_smbus_write_byte(client, val);
  18 }
  19
  20 static int write_r8d8(void *client, u8 reg, u8 val)
  21 {
  22         return i2c_smbus_write_byte_data(client, reg, val);
  23 }
  24
  25 static int write_r8d16(void *client, u8 reg, u16 val)
  26 {
  27         return i2c_smbus_write_word_data(client, reg, val);
  28 }
  29
  30 static int read_d8(void *client)
  31 {
  32         return i2c_smbus_read_byte(client);
  33 }
  34
  35 static int read_r8d8(void *client, u8 reg)
  36 {
  37         return i2c_smbus_read_byte_data(client, reg);
  38 }
  39
  40 static int read_r8d16(void *client, u8 reg)
  41 {
  42         return i2c_smbus_read_word_data(client, reg);
  43 }
  44
  45 static 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
  54 static int __devinit 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
  71 static int __devexit ad_dpot_i2c_remove(struct i2c_client *client)
  72 {
  73         return ad_dpot_remove(&client->dev);
  74 }
  75
  76 static 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 };
 104 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
 105
 106 static 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         = __devexit_p(ad_dpot_i2c_remove),
 113         .id_table       = ad_dpot_id,
 114 };
 115
 116 static int __init ad_dpot_i2c_init(void)
 117 {
 118         return i2c_add_driver(&ad_dpot_i2c_driver);
 119 }
 120 module_init(ad_dpot_i2c_init);
 121
 122 static void __exit ad_dpot_i2c_exit(void)
 123 {
 124         i2c_del_driver(&ad_dpot_i2c_driver);
 125 }
 126 module_exit(ad_dpot_i2c_exit);
 127
 128 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 129 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
 130 MODULE_LICENSE("GPL");
 131 MODULE_ALIAS("i2c:ad_dpot");