125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "common.h"
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#include "keyboard_raw.h"
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#include "keyboard_scan.h"
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#include "registers.h"
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#include "task.h"
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#include "irq_chip.h"
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/*
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* Initialize the raw keyboard interface.
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*/
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void keyboard_raw_init(void)
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{
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/* Ensure top-level interrupt is disabled */
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keyboard_raw_enable_interrupt(0);
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/*
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* bit2, Setting 1 enables the internal pull-up of the KSO[15:0] pins.
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* To pull up KSO[17:16], set the GPCR registers of their
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* corresponding GPIO ports.
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* bit0, Setting 1 enables the open-drain mode of the KSO[17:0] pins.
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*/
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IT83XX_KBS_KSOCTRL = 0x05;
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/* bit2, 1 enables the internal pull-up of the KSI[7:0] pins. */
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IT83XX_KBS_KSICTRL = 0x04;
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#ifdef CONFIG_KEYBOARD_COL2_INVERTED
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/* KSO[2] is high, others are low. */
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IT83XX_KBS_KSOL = BIT(2);
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#else
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/* KSO[7:0] pins low. */
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IT83XX_KBS_KSOL = 0x00;
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#endif
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/* KSO[15:8] pins low. */
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IT83XX_KBS_KSOH1 = 0x00;
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/* KSI[0-7] falling-edge triggered is selected */
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IT83XX_WUC_WUEMR3 = 0xFF;
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/* W/C */
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IT83XX_WUC_WUESR3 = 0xFF;
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task_clear_pending_irq(IT83XX_IRQ_WKINTC);
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/* Enable WUC for KSI[0-7] */
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IT83XX_WUC_WUENR3 = 0xFF;
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}
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/*
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* Finish initialization after task scheduling has started.
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*/
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void keyboard_raw_task_start(void)
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{
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IT83XX_WUC_WUESR3 = 0xFF;
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task_clear_pending_irq(IT83XX_IRQ_WKINTC);
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task_enable_irq(IT83XX_IRQ_WKINTC);
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}
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/*
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* Drive the specified column low.
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*/
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test_mockable void keyboard_raw_drive_column(int col)
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{
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int mask;
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/* Tri-state all outputs */
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if (col == KEYBOARD_COLUMN_NONE)
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mask = 0xffff;
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/* Assert all outputs */
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else if (col == KEYBOARD_COLUMN_ALL)
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mask = 0;
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/* Assert a single output */
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else
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mask = 0xffff ^ BIT(col);
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#ifdef CONFIG_KEYBOARD_COL2_INVERTED
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/* KSO[2] is inverted. */
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mask ^= BIT(2);
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#endif
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IT83XX_KBS_KSOL = mask & 0xff;
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IT83XX_KBS_KSOH1 = (mask >> 8) & 0xff;
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}
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/*
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* Read raw row state.
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* Bits are 1 if signal is present, 0 if not present.
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*/
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test_mockable int keyboard_raw_read_rows(void)
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{
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/* Bits are active-low, so invert returned levels */
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return IT83XX_KBS_KSI ^ 0xff;
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}
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/*
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* Enable or disable keyboard matrix scan interrupts.
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*/
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void keyboard_raw_enable_interrupt(int enable)
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{
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if (enable) {
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IT83XX_WUC_WUESR3 = 0xFF;
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task_clear_pending_irq(IT83XX_IRQ_WKINTC);
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task_enable_irq(IT83XX_IRQ_WKINTC);
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} else {
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task_disable_irq(IT83XX_IRQ_WKINTC);
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}
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}
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/*
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* Interrupt handler for keyboard matrix scan interrupt.
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*/
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void keyboard_raw_interrupt(void)
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{
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IT83XX_WUC_WUESR3 = 0xFF;
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task_clear_pending_irq(IT83XX_IRQ_WKINTC);
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/* Wake the scan task */
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task_wake(TASK_ID_KEYSCAN);
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}
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