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linux kernel driver自动创建设备

static int watchdog_init(void)
wdt_major = register_chrdev(0, "lte8718wdt", <e8718wdt_fopts);
wdt_class = class_create(THIS_MODULE, wdt_name);
device_create(wdt_class, NULL, MKDEV(wdt_major, 0), NULL, wdt_name);

static int watchdog_exit(void)
device_destroy(wdt_class, MKDEV(wdt_major, 0));
unregister_chrdev(lte8718wdt_major, "lte8718wdt");

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