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/* Copyright (c) 2012 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 "board.h"
#include "keyboard_scan.h"
#include "keyboard_scan_stub.h"
#include "registers.h"
/* Notes:
*
* Link proto0 board:
*
* Columns (outputs):
* KSO0 - KSO7 = PP0:7
* KSO8 - KSO12 = PQ0:4
*
* Rows (inputs):
* KSI0 - KSI7 = PN0:7
*
* Other:
* PWR_BTN# = PK7 (handled by gpio module)
*/
static int enable_scanning = 1; /* Must init to 1 for scanning at boot */
void lm4_set_scanning_enabled(int enabled)
{
enable_scanning = enabled;
}
int lm4_get_scanning_enabled(void)
{
return enable_scanning;
}
void lm4_select_column(int col)
{
if (col == COLUMN_TRI_STATE_ALL || !enable_scanning) {
/* Tri-state all outputs */
LM4_GPIO_DATA(LM4_GPIO_P, 0xff) = 0xff;
LM4_GPIO_DATA(LM4_GPIO_Q, 0x1f) = 0x1f;
} else if (col == COLUMN_ASSERT_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;
}
}
uint32_t lm4_clear_matrix_interrupt_status(void)
{
uint32_t ris = LM4_GPIO_RIS(KB_SCAN_ROW_GPIO);
LM4_GPIO_ICR(KB_SCAN_ROW_GPIO) = ris;
return ris;
}
void lm4_enable_matrix_interrupt(void)
{
LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0xff; /* 1: enable interrupt */
}
void lm4_disable_matrix_interrupt(void)
{
LM4_GPIO_IM(KB_SCAN_ROW_GPIO) = 0; /* 0: disable interrupt */
}
int lm4_read_raw_row_state(void)
{
return LM4_GPIO_DATA(KB_SCAN_ROW_GPIO, 0xff);
}
void lm4_configure_keyboard_gpio(void)
{
/* 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. Don't enable interrupts yet. */
LM4_GPIO_IS(KB_SCAN_ROW_GPIO) = 0;
LM4_GPIO_IBE(KB_SCAN_ROW_GPIO) = 0xff;
}
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