linux iic 分析

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

static int i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
    u8 reg_value;
    int ret;

    // 读取从设备寄存器的值
    ret = i2c_smbus_read_byte_data(client, 0x00); // 假设要读取的寄存器地址是0x00
    if (ret < 0) {
        printk(KERN_ERR "Failed to read from the i2c device
");
        return ret;
    }

    reg_value = (u8)ret;
    printk(KERN_INFO "Read value: 0x%02X
", reg_value);

    return 0;
}

static int i2c_remove(struct i2c_client *client) {
    // 设备移除时的清理工作
    return 0;
}

static const struct i2c_device_id my_i2c_device_id[] = {
    { "my_i2c_device", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, my_i2c_device_id);

static struct i2c_driver my_i2c_driver = {
    .driver = {
        .name = "my_i2c_driver",
        .owner = THIS_MODULE,
    },
    .probe = i2c_probe,
    .remove = i2c_remove,
    .id_table = my_i2c_device_id,
};

module_i2c_driver(my_i2c_driver);

MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple I2C driver example");
MODULE_LICENSE("GPL");