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/* Copyright (c) 2014 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.
*/
/* Functions needed by keyboard scanner module for Chrome EC */
#include "common.h"
#include "keyboard_raw.h"
#include "keyboard_scan.h"
#include "clock.h"
#include "gpio.h"
#include "registers.h"
#include "task.h"
/**
* Initialize the raw keyboard interface.
*/
void keyboard_raw_init(void)
{
/* Enable clock for KBS peripheral */
clock_enable_peripheral(CGC_OFFSET_KBS, CGC_KBS_MASK,
CGC_MODE_RUN | CGC_MODE_SLEEP);
/* Ensure top-level interrupt is disabled */
keyboard_raw_enable_interrupt(0);
/*
* Select quasi-bidirectional buffers for KSO pins. It reduces the
* low-to-high transition time. This feature only supports in npcx7.
*/
#ifdef CONFIG_KEYBOARD_KSO_HIGH_DRIVE
SET_FIELD(NPCX_KBSCTL, NPCX_KBHDRV_FIELD, 0x01);
#endif
/* pull-up KBSIN 0-7 internally */
NPCX_KBSINPU = 0xFF;
/* Disable automatic scan mode */
CLEAR_BIT(NPCX_KBSCTL, NPCX_KBSMODE);
/* Disable automatic interrupt enable */
CLEAR_BIT(NPCX_KBSCTL, NPCX_KBSIEN);
/* Disable increment enable */
CLEAR_BIT(NPCX_KBSCTL, NPCX_KBSINC);
/* Set KBSOUT to zero to detect key-press */
NPCX_KBSOUT0 = 0x00;
NPCX_KBSOUT1 = 0x00;
gpio_config_module(MODULE_KEYBOARD_SCAN, 1);
/*
* Enable interrupts for the inputs. The top-level interrupt is still
* masked off, so this won't trigger interrupts yet.
*/
/* Clear pending input sources used by scanner */
NPCX_WKPCL(MIWU_TABLE_WKKEY, MIWU_GROUP_WKKEY) = 0xFF;
/* Enable Wake-up Button */
NPCX_WKEN(MIWU_TABLE_WKKEY, MIWU_GROUP_WKKEY) = 0xFF;
/* Select high to low transition (falling edge) */
NPCX_WKEDG(MIWU_TABLE_WKKEY, MIWU_GROUP_WKKEY) = 0xFF;
/* Enable interrupt of WK KBS */
keyboard_raw_enable_interrupt(1);
}
/**
* Finish initialization after task scheduling has started.
*/
void keyboard_raw_task_start(void)
{
/* Enable MIWU to trigger KBS interrupt */
task_enable_irq(NPCX_IRQ_KSI_WKINTC_1);
}
/**
* Drive the specified column low.
*/
test_mockable void keyboard_raw_drive_column(int col)
{
/*
* Nuvoton Keyboard Scan IP supports 18x8 Matrix
* It also support automatic scan functionality
*/
uint32_t mask, col_out;
/* Add support for CONFIG_KEYBOARD_KSO_BASE shifting */
col_out = col + CONFIG_KEYBOARD_KSO_BASE;
/* Drive all lines to high */
if (col == KEYBOARD_COLUMN_NONE) {
mask = ~0;
#ifdef CONFIG_KEYBOARD_COL2_INVERTED
gpio_set_level(GPIO_KBD_KSO2, 0);
#endif
}
/* Set KBSOUT to zero to detect key-press */
else if (col == KEYBOARD_COLUMN_ALL) {
mask = ~((1 << keyboard_cols) - 1);
#ifdef CONFIG_KEYBOARD_COL2_INVERTED
gpio_set_level(GPIO_KBD_KSO2, 1);
#endif
}
/* Drive one line for detection */
else {
#ifdef CONFIG_KEYBOARD_COL2_INVERTED
if (col == 2)
gpio_set_level(GPIO_KBD_KSO2, 1);
else
gpio_set_level(GPIO_KBD_KSO2, 0);
#endif
mask = ~(1 << col_out);
}
/* Set KBSOUT */
NPCX_KBSOUT0 = (mask & 0xFFFF);
NPCX_KBSOUT1 = ((mask >> 16) & 0x03);
}
/**
* Read raw row state.
* Bits are 1 if signal is present, 0 if not present.
*/
test_mockable int keyboard_raw_read_rows(void)
{
/* Bits are active-low, so invert returned levels */
return (~NPCX_KBSIN) & KB_ROW_MASK;
}
/**
* Enable or disable keyboard interrupts.
*/
void keyboard_raw_enable_interrupt(int enable)
{
if (enable)
task_enable_irq(NPCX_IRQ_KSI_WKINTC_1);
else
task_disable_irq(NPCX_IRQ_KSI_WKINTC_1);
}
/*
* Interrupt handler for the entire GPIO bank of keyboard rows.
*/
void keyboard_raw_interrupt(void)
{
/* Clear pending input sources used by scanner */
NPCX_WKPCL(MIWU_TABLE_WKKEY, MIWU_GROUP_WKKEY) = 0xFF;
/* Wake the scan task */
task_wake(TASK_ID_KEYSCAN);
}
DECLARE_IRQ(NPCX_IRQ_KSI_WKINTC_1, keyboard_raw_interrupt, 5);
int keyboard_raw_is_input_low(int port, int id)
{
return (NPCX_PDIN(port) & (1 << id)) == 0;
}
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