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 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 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 }, 110 .probe = ad_dpot_i2c_probe, 111 .remove = ad_dpot_i2c_remove, 112 .id_table = ad_dpot_id, 113 }; 114 115 module_i2c_driver(ad_dpot_i2c_driver); 116 117 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 118 MODULE_DESCRIPTION("digital potentiometer I2C bus driver"); 119 MODULE_LICENSE("GPL"); 120