/*
 * Copyright (c) 2007-2017 Allwinnertech Co., Ltd.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

/*
*********************************************************************************************************
*                                                    LINUX-KERNEL
*                                        AllWinner Linux Platform Develop Kits
*                                                   Kernel Module
*
*                                    (c) Copyright 2006-2011, kevin.z China
*                                             All Rights Reserved
*
* File    : mem_key.c
* By      : kevin.z
* Version : v1.0
* Date    : 2011-5-31 15:16
* Descript:
* Update  : date                auther      ver     notes
*********************************************************************************************************
*/
#include "pm_i.h"

static __mem_key_reg_t *KeyReg;
static __u32 KeyCtrl, KeyIntc;
/* static __u32 KeyInts, KeyData0, KeyData1; */

/* ============================================================================== */
/*  QUERRY KEY FOR WAKE UP SYSTEM FROM MEM */
/* ============================================================================== */

/*
*********************************************************************************************************
*                                     INIT KEY FOR MEM
*
* Description: init key for mem.
*
* Arguments  : none
*
* Returns    : EPDK_OK;
*********************************************************************************************************
*/
__s32 mem_key_init(void)
{
	/* set key register base */
	KeyReg = (__mem_key_reg_t *) (IO_ADDRESS(AW_LRADC01_BASE));

	/* backup LRADC registers */
	KeyCtrl = KeyReg->Lradc_Ctrl;
	KeyIntc = KeyReg->Lradc_Intc;
	KeyReg->Lradc_Ctrl = 0;
	/* note: mem_mdelay(10); */
	KeyReg->Lradc_Ctrl = (0x1 << 6) | (0x1 << 0);
	KeyReg->Lradc_Intc = (0x1 << 1);
	KeyReg->Lradc_Ints = (0x1 << 1);

	return 0;
}

/*
*********************************************************************************************************
*                                     EXIT KEY FOR MEM
*
* Description: exit key for mem.
*
* Arguments  : none
*
* Returns    : EPDK_OK;
*********************************************************************************************************
*/
__s32 mem_key_exit(void)
{
	KeyReg->Lradc_Ctrl = KeyCtrl;
	KeyReg->Lradc_Intc = KeyIntc;
	return 0;
}

/*
*********************************************************************************************************
*                                     QUERY KEY FOR WAKEUP MEM
*
* Description: query key for wakeup mem.
*
* Arguments  : none
*
* Returns    : result;
*               EPDK_TRUE,      get a key;
*               EPDK_FALSE,     no key;
*********************************************************************************************************
*/
__s32 mem_query_key(void)
{
	if (KeyReg->Lradc_Ints & 0x2) {
		KeyReg->Lradc_Ints = 0x2;
		return 0;
	}
	return -1;
}