如何编写Linux驱动模块调用/使用其他驱动模块？

obj-m += my_driver.o
KVERSION := $(shell uname -r)
KDIR := /lib/modules/$(KVERSION)/build
PWD := $(shell pwd)

all:
	$(MAKE) -C $(KDIR) M=$(PWD) modules

clean:
	$(MAKE) -C $(KDIR) M=$(PWD) clean

sudo insmod my_driver.ko

sudo rmmod my_driver

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

static int __init my_driver_init(void) {
    printk(KERN_INFO "Loading my_driver module\n");
    request_module("other_driver");
    return 0;
}

static void __exit my_driver_exit(void) {
    printk(KERN_INFO "Unloading my_driver module\n");
}

module_init(my_driver_init);
module_exit(my_driver_exit);

#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/platform_device.h>
#include<linux/platform_driver.h>

static int my_driver_probe(struct platform_device *pdev) {
    printk(KERN_INFO "Loading my_driver module\n");
    return 0;
}

static int my_driver_remove(struct platform_device *pdev) {
    printk(KERN_INFO "Unloading my_driver module\n");
    return 0;
}

static struct platform_driver my_driver = {
    .probe = my_driver_probe,
    .remove = my_driver_remove,
    .driver = {
        .name = "my_driver",
    },
};

static struct platform_device my_device = {
    .name = "other_driver",
};

static int __init my_driver_init(void) {
    int ret;

    ret = platform_device_register(&my_device);
    if (ret) {
        printk(KERN_ERR "Failed to register platform device\n");
        return ret;
    }

    ret = platform_driver_register(&my_driver);
    if (ret) {
        printk(KERN_ERR "Failed to register platform driver\n");
        platform_device_unregister(&my_device);
        return ret;
    }

    return 0;
}

static void __exit my_driver_exit(void) {
    platform_driver_unregister(&my_driver);
    platform_device_unregister(&my_device);
}

module_init(my_driver_init);
module_exit(my_driver_exit);