/*
 * (C) Copyright 2007-2013
 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
 * Jerry Wang <wangflord@allwinnertech.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/key.h>
#include <asm/arch/sys_proto.h>
#include <sys_config.h>
#include <power/sunxi/pmu.h>
#include <fdt_support.h>
#include <asm/arch/ccmu.h>
#include <asm/arch/timer.h>
#include <sys_config_old.h>


__attribute__((section(".data")))
static int keyen_flag = 1;


int sunxi_key_init(void)
{
	uint reg_val = 0;

	sunxi_key_clock_open();

	/*choose channel 0*/
	reg_val = readl(GP_CS_EN);
	reg_val |= 1;
	writel(reg_val, GP_CS_EN);

	/*choose continue work mode and enable ADC*/
	reg_val = readl(GP_CTRL);
	reg_val &= ~(1<<18);
	reg_val |= ((1<<19) | (1<<16));
	writel(reg_val, GP_CTRL);

	/* disable all key irq */
	writel(0, GP_DATA_INTC);
	writel(1, GP_DATA_INTS);

	script_parser_fetch("key_detect_en", "keyen_flag", &keyen_flag, 1);

	return 0;
}

int sunxi_key_exit(void)
{
	writel(0, GP_CTRL);
	/* disable all key irq */
	writel(0, GP_DATA_INTC);
	writel(0, GP_DATA_INTS);

	sunxi_key_clock_close();

	return 0;
}

int sunxi_key_read(void)
{
	u32 ints;
	int key = -1;
	int vin;

	if (!keyen_flag)
		return -1;

	ints = readl(GP_DATA_INTS);
	/* clear the pending data */
	writel(readl(GP_DATA_INTS)|(ints & 0x1), GP_DATA_INTS);
	/* if there is already data pending, read it */
	if (ints & GPADC0_DATA_PENDING) {
		vin = readl(GP_CH0_DATA)*18/4095;
		if (vin > 16)
			key = -1;
		else {
			key = readl(GP_CH0_DATA)*63/4095;
			printf("key pressed value=0x%x\n", key);
		}
	}
	return key;
}


int do_key_test(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	u32 power_key = 0;

	writel(1, GP_DATA_INTS);

	printf(" press a key:\n");
	while(!ctrlc())
	{
		sunxi_key_read();
		power_key = axp_probe_key();
		if(power_key > 0) {
			break;
		}
	}

	return 0;

}

U_BOOT_CMD(
	key_test, 1, 0,	do_key_test,
	"Test the key value\n",
	""
);