| Michael Hennerich | 6c536e4 | 2010-05-24 14:33:14 -0700 | [diff] [blame^] | 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 */ |
| 16 | static int write_d8(void *client, u8 val) |
| 17 | { |
| 18 | return i2c_smbus_write_byte(client, val); |
| 19 | } |
| 20 | |
| 21 | static int write_r8d8(void *client, u8 reg, u8 val) |
| 22 | { |
| 23 | return i2c_smbus_write_byte_data(client, reg, val); |
| 24 | } |
| 25 | |
| 26 | static int write_r8d16(void *client, u8 reg, u16 val) |
| 27 | { |
| 28 | return i2c_smbus_write_word_data(client, reg, val); |
| 29 | } |
| 30 | |
| 31 | static int read_d8(void *client) |
| 32 | { |
| 33 | return i2c_smbus_read_byte(client); |
| 34 | } |
| 35 | |
| 36 | static int read_r8d8(void *client, u8 reg) |
| 37 | { |
| 38 | return i2c_smbus_read_byte_data(client, reg); |
| 39 | } |
| 40 | |
| 41 | static int read_r8d16(void *client, u8 reg) |
| 42 | { |
| 43 | return i2c_smbus_read_word_data(client, reg); |
| 44 | } |
| 45 | |
| 46 | static 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 | |
| 55 | static 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 | |
| 77 | static int __devexit ad_dpot_i2c_remove(struct i2c_client *client) |
| 78 | { |
| 79 | return ad_dpot_remove(&client->dev); |
| 80 | } |
| 81 | |
| 82 | static 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 | {} |
| 91 | }; |
| 92 | MODULE_DEVICE_TABLE(i2c, ad_dpot_id); |
| 93 | |
| 94 | static struct i2c_driver ad_dpot_i2c_driver = { |
| 95 | .driver = { |
| 96 | .name = "ad_dpot", |
| 97 | .owner = THIS_MODULE, |
| 98 | }, |
| 99 | .probe = ad_dpot_i2c_probe, |
| 100 | .remove = __devexit_p(ad_dpot_i2c_remove), |
| 101 | .id_table = ad_dpot_id, |
| 102 | }; |
| 103 | |
| 104 | static int __init ad_dpot_i2c_init(void) |
| 105 | { |
| 106 | return i2c_add_driver(&ad_dpot_i2c_driver); |
| 107 | } |
| 108 | module_init(ad_dpot_i2c_init); |
| 109 | |
| 110 | static void __exit ad_dpot_i2c_exit(void) |
| 111 | { |
| 112 | i2c_del_driver(&ad_dpot_i2c_driver); |
| 113 | } |
| 114 | module_exit(ad_dpot_i2c_exit); |
| 115 | |
| 116 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 117 | MODULE_DESCRIPTION("digital potentiometer I2C bus driver"); |
| 118 | MODULE_LICENSE("GPL"); |
| 119 | MODULE_ALIAS("i2c:ad_dpot"); |