linux I2C总线编写三色灯驱动

好的，我可以为您提供一份简单的Linux I2C总线编写三色灯驱动的代码，代码如下：

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

#define DRIVER_NAME "my_i2c_led"

#define REG_RED_LED_ON 0x01
#define REG_RED_LED_OFF 0x02
#define REG_GREEN_LED_ON 0x03
#define REG_GREEN_LED_OFF 0x04
#define REG_BLUE_LED_ON 0x05
#define REG_BLUE_LED_OFF 0x06

static const struct i2c_device_id my_i2c_led_id[] = {
    { DRIVER_NAME, 0 },
    { }
};

static int my_i2c_led_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
    printk(KERN_INFO "my_i2c_led_probe!\n");

    return 0;
}

static int my_i2c_led_remove(struct i2c_client *client)
{
    printk(KERN_INFO "my_i2c_led_remove!\n");

    return 0;
}

static ssize_t my_i2c_led_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
    struct i2c_client *client = file->private_data;
    int ret = 0;
    char data_buf[2];

    if (count < 2)
        return -EINVAL;

    ret = copy_from_user(data_buf, buf, 2);
    if (ret)
        return -EFAULT;

    switch (data_buf[0]) {
    case REG_RED_LED_ON:
        // Turn on Red LED
        i2c_smbus_write_byte_data(client, 0x00, 0x01);
        break;
    case REG_RED_LED_OFF:
        // Turn off Red LED
        i2c_smbus_write_byte_data(client, 0x00, 0x00);
        break;
    case REG_GREEN_LED_ON:
        // Turn on Green LED
        i2c_smbus_write_byte_data(client, 0x01, 0x01);
        break;
    case REG_GREEN_LED_OFF:
        // Turn off Green LED
        i2c_smbus_write_byte_data(client, 0x01, 0x00);
        break;
    case REG_BLUE_LED_ON:
        // Turn on Blue LED
        i2c_smbus_write_byte_data(client, 0x02, 0x01);
        break;
    case REG_BLUE_LED_OFF:
        // Turn off Blue LED
        i2c_smbus_write_byte_data(client, 0x02, 0x00);
        break;
    default:
        break;
    }

    return count;
}

static const struct file_operations my_i2c_led_fops = {
    .owner = THIS_MODULE,
    .write = my_i2c_led_write,
};

static struct i2c_driver my_i2c_led_driver = {
    .driver = {
        .name = DRIVER_NAME,
    },
    .probe = my_i2c_led_probe,
    .remove = my_i2c_led_remove,
    .id_table = my_i2c_led_id,
};

static int __init my_i2c_led_init(void)
{
    int ret = 0;

    ret = i2c_add_driver(&my_i2c_led_driver);
    if (ret)
        printk(KERN_ERR "Failed to register i2c driver!\n");

    return ret;
}

static void __exit my_i2c_led_exit(void)
{
    i2c_del_driver(&my_i2c_led_driver);
}

module_init(my_i2c_led_init);
module_exit(my_i2c_led_exit);

MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("I2C LED Driver");
MODULE_LICENSE("GPL");

此代码是一个基于Linux I2C总线的三色灯驱动，使用了i2c_smbus_write_byte_data函数来控制三色灯的开关。您需要在设备树中添加i2c设备节点，然后将其与此驱动程序匹配，并在用户空间中使用write函数来控制三色灯的颜色。