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/* 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.
*/
/* Functions needed by keyboard scanner module for Chrome EC */
#include "common.h"
#include "keyboard_raw.h"
#include "keyboard_scan.h"
#include "registers.h"
#include "task.h"
void keyboard_raw_init(void)
{
/* Ensure top-level interrupt is disabled */
keyboard_raw_enable_interrupt(0);
/*
* Set column outputs as open-drain; we either pull them low or let
* them float high.
*/
LM4_GPIO_AFSEL(LM4_GPIO_P) = 0; /* KSO[7:0] */
LM4_GPIO_AFSEL(LM4_GPIO_Q) &= ~0x1f; /* KSO[12:8] */
LM4_GPIO_DEN(LM4_GPIO_P) = 0xff;
LM4_GPIO_DEN(LM4_GPIO_Q) |= 0x1f;
LM4_GPIO_DIR(LM4_GPIO_P) = 0xff;
LM4_GPIO_DIR(LM4_GPIO_Q) |= 0x1f;
LM4_GPIO_ODR(LM4_GPIO_P) = 0xff;
LM4_GPIO_ODR(LM4_GPIO_Q) |= 0x1f;
/* Set row inputs with pull-up */
LM4_GPIO_AFSEL(KB_SCAN_ROW_GPIO) &= 0xff;
LM4_GPIO_DEN(KB_SCAN_ROW_GPIO) |= 0xff;
LM4_GPIO_DIR(KB_SCAN_ROW_GPIO) = 0;
LM4_GPIO_PUR(KB_SCAN_ROW_GPIO) = 0xff;
/* Edge-sensitive on both edges. */
LM4_GPIO_IS(KB_SCAN_ROW_GPIO) = 0;
LM4_GPIO_IBE(KB_SCAN_ROW_GPIO) = 0xff;
/*
* Enable interrupts for the inputs. The top-level interrupt is still
* masked off, so this won't trigger interrupts yet.
*/
LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0xff;
}
void keyboard_raw_task_start(void)
{
task_enable_irq(KB_SCAN_ROW_IRQ);
}
test_mockable void keyboard_raw_drive_column(int col)
{
if (col == KEYBOARD_COLUMN_NONE) {
/* Tri-state all outputs */
LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0xff;
LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0x1f;
} else if (col == KEYBOARD_COLUMN_ALL) {
/* Assert all outputs */
LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0;
LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0;
} else {
/* Assert a single output */
LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0xff;
LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0x1f;
if (col < 8)
LM4_GPIO_DATA(LM4_GPIO_P, 1 << col) = 0;
else
LM4_GPIO_DATA(LM4_GPIO_Q, 1 << (col - 8)) = 0;
}
}
test_mockable int keyboard_raw_read_rows(void)
{
/* Bits are active-low, so invert returned levels */
return LM4_GPIO_DATA(KB_SCAN_ROW_GPIO, 0xff) ^ 0xff;
}
void keyboard_raw_enable_interrupt(int enable)
{
if (enable) {
/*
* Clear pending interrupts before enabling them, because the
* raw interrupt status may have been tripped by keyboard
* scanning or, if a key is already pressed, by driving all the
* outputs.
*
* We won't lose keyboard events because the scanning task will
* explicitly check the raw row state before waiting for an
* interrupt. If a key is pressed, the task won't wait.
*/
LM4_GPIO_ICR(KB_SCAN_ROW_GPIO) = 0xff;
LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0xff;
} else {
LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0;
}
}
/**
* Interrupt handler for the entire GPIO bank of keyboard rows.
*/
static void keyboard_raw_interrupt(void)
{
/* Clear all pending keyboard interrupts */
LM4_GPIO_ICR(KB_SCAN_ROW_GPIO) = 0xff;
/* Wake the scan task */
task_wake(TASK_ID_KEYSCAN);
}
DECLARE_IRQ(KB_SCAN_ROW_IRQ, keyboard_raw_interrupt, 3);
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