linux i2c设备驱动

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/init.h>

static struct i2c_client *client;

static int i2c_read_data(struct i2c_client *client, char *buf, int len) {
    struct i2c_msg msgs[] = {
        {
            .addr = client->addr,
            .flags = 0,
            .len = len,
            .buf = buf,
        },
    };
    if (i2c_transfer(client->adapter, msgs, 1) != 1) {
        return -EIO;
    }
    return 0;
}

static int __init i2c_driver_init(void) {
    struct i2c_adapter *adapter;
    adapter = i2c_get_adapter(1); // 假设使用I2C总线1
    if (!adapter) {
        return -ENODEV;
    }

    client = i2c_new_client_device(adapter, &i2c_device_id);
    if (!client) {
        i2c_put_adapter(adapter);
        return -ENODEV;
    }

    // 读取数据示例
    char data[10];
    if (i2c_read_data(client, data, sizeof(data)) == 0) {
        printk(KERN_INFO "Read data: %s\n", data);
    } else {
        printk(KERN_ERR "Failed to read data\n");
    }

    return 0;
}

static void __exit i2c_driver_exit(void) {
    i2c_unregister_device(client);
}

MODULE_LICENSE("GPL");
module_init(i2c_driver_init);
module_exit(i2c_driver_exit);