86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2009 Wolfram Sang, Pengutronix
|
||
|
|
*
|
||
|
|
* Check max730x.c for further details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/i2c.h>
|
||
|
|
#include <linux/spi/max7301.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
static int max7300_i2c_write(struct device *dev, unsigned int reg,
|
||
|
|
unsigned int val)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(dev);
|
||
|
|
|
||
|
|
return i2c_smbus_write_byte_data(client, reg, val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int max7300_i2c_read(struct device *dev, unsigned int reg)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(dev);
|
||
|
|
|
||
|
|
return i2c_smbus_read_byte_data(client, reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int max7300_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *id)
|
||
|
|
{
|
||
|
|
struct max7301 *ts;
|
||
|
|
|
||
|
|
if (!i2c_check_functionality(client->adapter,
|
||
|
|
I2C_FUNC_SMBUS_BYTE_DATA))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
|
||
|
|
if (!ts)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ts->read = max7300_i2c_read;
|
||
|
|
ts->write = max7300_i2c_write;
|
||
|
|
ts->dev = &client->dev;
|
||
|
|
|
||
|
|
return __max730x_probe(ts);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int max7300_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
return __max730x_remove(&client->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id max7300_id[] = {
|
||
|
|
{ "max7300", 0 },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, max7300_id);
|
||
|
|
|
||
|
|
static struct i2c_driver max7300_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "max7300",
|
||
|
|
},
|
||
|
|
.probe = max7300_probe,
|
||
|
|
.remove = max7300_remove,
|
||
|
|
.id_table = max7300_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init max7300_init(void)
|
||
|
|
{
|
||
|
|
return i2c_add_driver(&max7300_driver);
|
||
|
|
}
|
||
|
|
subsys_initcall(max7300_init);
|
||
|
|
|
||
|
|
static void __exit max7300_exit(void)
|
||
|
|
{
|
||
|
|
i2c_del_driver(&max7300_driver);
|
||
|
|
}
|
||
|
|
module_exit(max7300_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Wolfram Sang");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
|