Michael Hennerich | e27c729 | 2010-06-25 08:44:10 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface) |
| 3 | * |
| 4 | * Enter bugs at http://blackfin.uclinux.org/ |
| 5 | * |
| 6 | * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. |
| 7 | * Licensed under the GPL-2 or later. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/input.h> /* BUS_I2C */ |
| 11 | #include <linux/i2c.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/types.h> |
| 14 | #include "adxl34x.h" |
| 15 | |
| 16 | static int adxl34x_smbus_read(struct device *dev, unsigned char reg) |
| 17 | { |
| 18 | struct i2c_client *client = to_i2c_client(dev); |
| 19 | |
| 20 | return i2c_smbus_read_byte_data(client, reg); |
| 21 | } |
| 22 | |
| 23 | static int adxl34x_smbus_write(struct device *dev, |
| 24 | unsigned char reg, unsigned char val) |
| 25 | { |
| 26 | struct i2c_client *client = to_i2c_client(dev); |
| 27 | |
| 28 | return i2c_smbus_write_byte_data(client, reg, val); |
| 29 | } |
| 30 | |
| 31 | static int adxl34x_smbus_read_block(struct device *dev, |
| 32 | unsigned char reg, int count, |
| 33 | void *buf) |
| 34 | { |
| 35 | struct i2c_client *client = to_i2c_client(dev); |
| 36 | |
| 37 | return i2c_smbus_read_i2c_block_data(client, reg, count, buf); |
| 38 | } |
| 39 | |
| 40 | static int adxl34x_i2c_read_block(struct device *dev, |
| 41 | unsigned char reg, int count, |
| 42 | void *buf) |
| 43 | { |
| 44 | struct i2c_client *client = to_i2c_client(dev); |
| 45 | int ret; |
| 46 | |
| 47 | ret = i2c_master_send(client, ®, 1); |
| 48 | if (ret < 0) |
| 49 | return ret; |
| 50 | |
| 51 | ret = i2c_master_recv(client, buf, count); |
| 52 | if (ret < 0) |
| 53 | return ret; |
| 54 | |
| 55 | if (ret != count) |
| 56 | return -EIO; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static const struct adxl34x_bus_ops adx134x_smbus_bops = { |
| 62 | .bustype = BUS_I2C, |
| 63 | .write = adxl34x_smbus_write, |
| 64 | .read = adxl34x_smbus_read, |
| 65 | .read_block = adxl34x_smbus_read_block, |
| 66 | }; |
| 67 | |
| 68 | static const struct adxl34x_bus_ops adx134x_i2c_bops = { |
| 69 | .bustype = BUS_I2C, |
| 70 | .write = adxl34x_smbus_write, |
| 71 | .read = adxl34x_smbus_read, |
| 72 | .read_block = adxl34x_i2c_read_block, |
| 73 | }; |
| 74 | |
| 75 | static int __devinit adxl34x_i2c_probe(struct i2c_client *client, |
| 76 | const struct i2c_device_id *id) |
| 77 | { |
| 78 | struct adxl34x *ac; |
| 79 | int error; |
| 80 | |
| 81 | error = i2c_check_functionality(client->adapter, |
| 82 | I2C_FUNC_SMBUS_BYTE_DATA); |
| 83 | if (!error) { |
| 84 | dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); |
| 85 | return -EIO; |
| 86 | } |
| 87 | |
| 88 | ac = adxl34x_probe(&client->dev, client->irq, false, |
| 89 | i2c_check_functionality(client->adapter, |
| 90 | I2C_FUNC_SMBUS_READ_I2C_BLOCK) ? |
| 91 | &adx134x_smbus_bops : &adx134x_i2c_bops); |
| 92 | if (IS_ERR(ac)) |
| 93 | return PTR_ERR(ac); |
| 94 | |
| 95 | i2c_set_clientdata(client, ac); |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static int __devexit adxl34x_i2c_remove(struct i2c_client *client) |
| 101 | { |
| 102 | struct adxl34x *ac = i2c_get_clientdata(client); |
| 103 | |
| 104 | return adxl34x_remove(ac); |
| 105 | } |
| 106 | |
| 107 | #ifdef CONFIG_PM |
| 108 | static int adxl34x_suspend(struct i2c_client *client, pm_message_t message) |
| 109 | { |
| 110 | struct adxl34x *ac = i2c_get_clientdata(client); |
| 111 | |
| 112 | adxl34x_disable(ac); |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int adxl34x_resume(struct i2c_client *client) |
| 118 | { |
| 119 | struct adxl34x *ac = i2c_get_clientdata(client); |
| 120 | |
| 121 | adxl34x_enable(ac); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | #else |
| 126 | # define adxl34x_suspend NULL |
| 127 | # define adxl34x_resume NULL |
| 128 | #endif |
| 129 | |
| 130 | static const struct i2c_device_id adxl34x_id[] = { |
| 131 | { "adxl34x", 0 }, |
| 132 | { } |
| 133 | }; |
| 134 | |
| 135 | MODULE_DEVICE_TABLE(i2c, adxl34x_id); |
| 136 | |
| 137 | static struct i2c_driver adxl34x_driver = { |
| 138 | .driver = { |
| 139 | .name = "adxl34x", |
| 140 | .owner = THIS_MODULE, |
| 141 | }, |
| 142 | .probe = adxl34x_i2c_probe, |
| 143 | .remove = __devexit_p(adxl34x_i2c_remove), |
| 144 | .suspend = adxl34x_suspend, |
| 145 | .resume = adxl34x_resume, |
| 146 | .id_table = adxl34x_id, |
| 147 | }; |
| 148 | |
| 149 | static int __init adxl34x_i2c_init(void) |
| 150 | { |
| 151 | return i2c_add_driver(&adxl34x_driver); |
| 152 | } |
| 153 | module_init(adxl34x_i2c_init); |
| 154 | |
| 155 | static void __exit adxl34x_i2c_exit(void) |
| 156 | { |
| 157 | i2c_del_driver(&adxl34x_driver); |
| 158 | } |
| 159 | module_exit(adxl34x_i2c_exit); |
| 160 | |
| 161 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 162 | MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver"); |
| 163 | MODULE_LICENSE("GPL"); |