altera ps2功能linux驱动代码

/*

• Altera University Program PS2 controller driver
• Based on sa1111ps2.c, which is:
• Copyright © 2002 Russell King
• This program is free software; you can redistribute it and/or modify
• it under the terms of the GNU General Public License version 2 as
• published by the Free Software Foundation.
  */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>

#define DRV_NAME “altera_ps2”

struct ps2if {
struct serio *io;
void __iomem *base;
};

/*

• Read all bytes waiting in the PS2 port. There should be

• at the most one, but we loop for safety.
  */
  static irqreturn_t a