156 строки
3.4 KiB
C
156 строки
3.4 KiB
C
/*
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* ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/input.h> /* BUS_I2C */
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/pm.h>
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#include "adxl34x.h"
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static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int adxl34x_smbus_write(struct device *dev,
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unsigned char reg, unsigned char val)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_write_byte_data(client, reg, val);
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}
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static int adxl34x_smbus_read_block(struct device *dev,
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unsigned char reg, int count,
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void *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
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}
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static int adxl34x_i2c_read_block(struct device *dev,
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unsigned char reg, int count,
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void *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret;
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ret = i2c_master_send(client, ®, 1);
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if (ret < 0)
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return ret;
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ret = i2c_master_recv(client, buf, count);
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if (ret < 0)
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return ret;
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if (ret != count)
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return -EIO;
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return 0;
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}
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static const struct adxl34x_bus_ops adxl34x_smbus_bops = {
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.bustype = BUS_I2C,
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.write = adxl34x_smbus_write,
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.read = adxl34x_smbus_read,
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.read_block = adxl34x_smbus_read_block,
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};
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static const struct adxl34x_bus_ops adxl34x_i2c_bops = {
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.bustype = BUS_I2C,
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.write = adxl34x_smbus_write,
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.read = adxl34x_smbus_read,
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.read_block = adxl34x_i2c_read_block,
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};
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static int adxl34x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adxl34x *ac;
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int error;
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error = i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA);
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if (!error) {
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dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
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return -EIO;
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}
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ac = adxl34x_probe(&client->dev, client->irq, false,
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i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
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&adxl34x_smbus_bops : &adxl34x_i2c_bops);
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if (IS_ERR(ac))
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return PTR_ERR(ac);
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i2c_set_clientdata(client, ac);
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return 0;
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}
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static int adxl34x_i2c_remove(struct i2c_client *client)
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{
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struct adxl34x *ac = i2c_get_clientdata(client);
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return adxl34x_remove(ac);
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}
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#ifdef CONFIG_PM
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static int adxl34x_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct adxl34x *ac = i2c_get_clientdata(client);
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adxl34x_suspend(ac);
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return 0;
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}
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static int adxl34x_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct adxl34x *ac = i2c_get_clientdata(client);
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adxl34x_resume(ac);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
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adxl34x_i2c_resume);
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static const struct i2c_device_id adxl34x_id[] = {
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{ "adxl34x", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adxl34x_id);
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static struct i2c_driver adxl34x_driver = {
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.driver = {
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.name = "adxl34x",
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.owner = THIS_MODULE,
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.pm = &adxl34x_i2c_pm,
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},
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.probe = adxl34x_i2c_probe,
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.remove = adxl34x_i2c_remove,
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.id_table = adxl34x_id,
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};
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module_i2c_driver(adxl34x_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
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MODULE_LICENSE("GPL");
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