IOCTL parameter cmd=2 error

The IOCTL is used when writing kernel drivers. Define the cmd itself as the parameters of the IOCTL. As follows:

enum CMD {    level_down,    level_up,    gpio_input,    gpio_output,    Gpio_get,};

IOCTL underlying calling code:

Static long led_ioctl (structintlong  arg) {   }

When the application layer invokes the IOCTL, an error occurs when the incoming cmd=2.
The IOCTL return value is-1. Error number errno:14, bad address.

Internet access only know the need to use macros such as _IOWR to generate CMD commands, but not to write their own.
Although it is possible to write on your own, it is likely to conflict with other CMD commands in the system. Just when the cmd=2 of the IOCTL made a mistake.
The new definition of CMD is as follows:

#define     Type            #define     level_down      _iowr (type, 0, int)#define     level_up        _iowr (type, 1, int)#define     gpio_input      _iowr (type, 2, int)#define     gpio_output     _iowr (type , 3, int)#define     gpio_get        _iowr (TYPE, 4, int)

IOCTL parameter cmd=2 error