1/* 2 * Driver for the Analog Devices digital potentiometers (I2C bus) 3 * 4 * Copyright (C) 2010 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/* ------------------------------------------------------------------------- */ 15/* I2C bus functions */ 16static int write_d8(void *client, u8 val) 17{ 18 return i2c_smbus_write_byte(client, val); 19} 20 21static int write_r8d8(void *client, u8 reg, u8 val) 22{ 23 return i2c_smbus_write_byte_data(client, reg, val); 24} 25 26static int write_r8d16(void *client, u8 reg, u16 val) 27{ 28 return i2c_smbus_write_word_data(client, reg, val); 29} 30 31static int read_d8(void *client) 32{ 33 return i2c_smbus_read_byte(client); 34} 35 36static int read_r8d8(void *client, u8 reg) 37{ 38 return i2c_smbus_read_byte_data(client, reg); 39} 40 41static int read_r8d16(void *client, u8 reg) 42{ 43 return i2c_smbus_read_word_data(client, reg); 44} 45 46static const struct ad_dpot_bus_ops bops = { 47 .read_d8 = read_d8, 48 .read_r8d8 = read_r8d8, 49 .read_r8d16 = read_r8d16, 50 .write_d8 = write_d8, 51 .write_r8d8 = write_r8d8, 52 .write_r8d16 = write_r8d16, 53}; 54 55static int __devinit ad_dpot_i2c_probe(struct i2c_client *client, 56 const struct i2c_device_id *id) 57{ 58 struct ad_dpot_bus_data bdata = { 59 .client = client, 60 .bops = &bops, 61 }; 62 63 struct ad_dpot_id dpot_id = { 64 .name = (char *) &id->name, 65 .devid = id->driver_data, 66 }; 67 68 if (!i2c_check_functionality(client->adapter, 69 I2C_FUNC_SMBUS_WORD_DATA)) { 70 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 71 return -EIO; 72 } 73 74 return ad_dpot_probe(&client->dev, &bdata, &dpot_id); 75} 76 77static int __devexit ad_dpot_i2c_remove(struct i2c_client *client) 78{ 79 return ad_dpot_remove(&client->dev); 80} 81 82static const struct i2c_device_id ad_dpot_id[] = { 83 {"ad5258", AD5258_ID}, 84 {"ad5259", AD5259_ID}, 85 {"ad5251", AD5251_ID}, 86 {"ad5252", AD5252_ID}, 87 {"ad5253", AD5253_ID}, 88 {"ad5254", AD5254_ID}, 89 {"ad5255", AD5255_ID}, 90 {"ad5241", AD5241_ID}, 91 {"ad5242", AD5242_ID}, 92 {"ad5243", AD5243_ID}, 93 {"ad5245", AD5245_ID}, 94 {"ad5246", AD5246_ID}, 95 {"ad5247", AD5247_ID}, 96 {"ad5248", AD5248_ID}, 97 {"ad5280", AD5280_ID}, 98 {"ad5282", AD5282_ID}, 99 {"adn2860", ADN2860_ID}, 100 {"ad5273", AD5273_ID}, 101 {"ad5171", AD5171_ID}, 102 {"ad5170", AD5170_ID}, 103 {"ad5172", AD5172_ID}, 104 {"ad5173", AD5173_ID}, 105 {} 106}; 107MODULE_DEVICE_TABLE(i2c, ad_dpot_id); 108 109static struct i2c_driver ad_dpot_i2c_driver = { 110 .driver = { 111 .name = "ad_dpot", 112 .owner = THIS_MODULE, 113 }, 114 .probe = ad_dpot_i2c_probe, 115 .remove = __devexit_p(ad_dpot_i2c_remove), 116 .id_table = ad_dpot_id, 117}; 118 119static int __init ad_dpot_i2c_init(void) 120{ 121 return i2c_add_driver(&ad_dpot_i2c_driver); 122} 123module_init(ad_dpot_i2c_init); 124 125static void __exit ad_dpot_i2c_exit(void) 126{ 127 i2c_del_driver(&ad_dpot_i2c_driver); 128} 129module_exit(ad_dpot_i2c_exit); 130 131MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 132MODULE_DESCRIPTION("digital potentiometer I2C bus driver"); 133MODULE_LICENSE("GPL"); 134MODULE_ALIAS("i2c:ad_dpot"); 135