/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Raw keyboard I/O layer for MEC1322
 */

#include "gpio.h"
#include "keyboard_config.h"
#include "keyboard_raw.h"
#include "keyboard_scan.h"
#include "registers.h"
#include "task.h"
#include "util.h"

void keyboard_raw_init(void)
{
	keyboard_raw_enable_interrupt(0);
	gpio_config_module(MODULE_KEYBOARD_SCAN, 1);

	/* Enable keyboard scan interrupt */
	MEC1322_INT_ENABLE(17) |= 1 << 21;
	MEC1322_INT_BLK_EN |= 1 << 17;
	MEC1322_KS_KSI_INT_EN = 0xff;
}

void keyboard_raw_task_start(void)
{
	task_enable_irq(MEC1322_IRQ_KSC_INT);
}

test_mockable void keyboard_raw_drive_column(int out)
{
	if (out == KEYBOARD_COLUMN_ALL)
		MEC1322_KS_KSO_SEL = 1 << 5; /* KSEN=0, KSALL=1 */
	else if (out == KEYBOARD_COLUMN_NONE)
		MEC1322_KS_KSO_SEL = 1 << 6; /* KSEN=1 */
	else
		MEC1322_KS_KSO_SEL = out + 4; /* KSO starts from KSO04 */
}

test_mockable int keyboard_raw_read_rows(void)
{
	/* Invert it so 0=not pressed, 1=pressed */
	return (MEC1322_KS_KSI_INPUT & 0xff) ^ 0xff;
}

void keyboard_raw_enable_interrupt(int enable)
{
	if (enable) {
		task_clear_pending_irq(MEC1322_IRQ_KSC_INT);
		task_enable_irq(MEC1322_IRQ_KSC_INT);
	} else {
		task_disable_irq(MEC1322_IRQ_KSC_INT);
	}
}

static void keyboard_raw_interrupt(void)
{
	/* Clear interrupt status bits */
	MEC1322_KS_KSI_STATUS = 0xff;

	/* Wake keyboard scan task to handle interrupt */
	task_wake(TASK_ID_KEYSCAN);
}
DECLARE_IRQ(MEC1322_IRQ_KSC_INT, keyboard_raw_interrupt, 1);