debugf
#define debugf(client, fmt, args...) kprintf("evdev cdev: "fmt"\n", ##args)
#define debugf(client, fmt, args...)
#define debugf(evdev, fmt, args...) kprintf("evdev: " fmt "\n", ##args)
#define debugf(evdev, fmt, args...)
#define debugf(fmt, args...) kprintf("evdev: " fmt "\n", ##args)
#define debugf(fmt, args...)