static void register_buttons(struct button_t *b);
static void unregister_buttons(struct button_t *b);
-#ifndef LINUX_2_4
static void hotplug_button(struct work_struct *work);
static irqreturn_t button_handler(int irq, void *dev_id);
-#else
-static void hotplug_button(struct event_t *event);
-static irqreturn_t button_handler(int irq, void *dev_id, struct pt_regs *regs);
-#endif
/* leds */