linux-imx

/*

 * linux/drivers/parisc/power.c

 * HP PARISC soft power switch support driver

 *

 * Copyright (c) 2001-2007 Helge Deller <deller@gmx.de>

 * All rights reserved.

 *

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL").

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR

 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 *

 *

 *  HINT:

 *  Support of the soft power switch button may be enabled or disabled at

 *  runtime through the "/proc/sys/kernel/power" procfs entry.

 */ 

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/notifier.h>

#include <linux/reboot.h>

#include <linux/sched/signal.h>

#include <linux/kthread.h>

#include <linux/pm.h>

​

#include <asm/pdc.h>

#include <asm/io.h>

#include <asm/led.h>

​

#define DRIVER_NAME  "powersw"

#define KTHREAD_NAME "kpowerswd"

​

/* how often should the power button be polled ? */

#define POWERSWITCH_POLL_PER_SEC 2

​

/* how long does the power button needs to be down until we react ? */

#define POWERSWITCH_DOWN_SEC 2

​

/* assembly code to access special registers */

/* taken from PCXL ERS page 82 */

#define DIAG_CODE(code)     (0x14000000 + ((code)<<5))

​

#define MFCPU_X(rDiagReg, t_ch, t_th, code) \