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/* Copyright (c) 2011 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.
*/
/* Keyboard scanner module for Chrome EC */
#include "console.h"
#include "keyboard.h"
#include "keyboard_scan.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "uart.h"
#include "util.h"
#define KB_COLS 13
/* Notes:
*
* Columns (outputs):
* KSO0 - KSO7 = PQ0:7
* KSO8 - KSO11 = PK0:3
* KSO12 = PN2
* Rows (inputs):
* KSI0 - KSI7 = PH0:7
* Other:
* PWR_BTN# = PC5
*/
static uint8_t raw_state[KB_COLS];
/* Mask with 1 bits only for keys that actually exist */
static const uint8_t *actual_key_mask;
/* All actual key masks (todo: move to keyboard matrix definition */
/* TODO: fill in real key mask with 0-bits for coords that aren't keys */
static const uint8_t actual_key_masks[4][KB_COLS] = {
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
{0},
{0},
{0},
};
/* Drives the specified column low; other columns are tri-stated */
static void select_column(int col)
{
#if defined(EVT)
if (col < 0) {
LM4_GPIO_DIR(P) &= ~0xff;
LM4_GPIO_DIR(Q) &= ~0x1f;
} else if (col < 8) {
LM4_GPIO_DIR(P) &= ~0xff;
LM4_GPIO_DIR(Q) &= ~0x1f;
LM4_GPIO_DATA_BITS(P, 0xff << 2) = ~(1 << col);
LM4_GPIO_DIR(P) = (1 << col) & 0xff;
} else {
LM4_GPIO_DIR(P) &= ~0xff;
LM4_GPIO_DIR(Q) &= ~0x1f;
LM4_GPIO_DATA_BITS(Q, 0xff << 2) = ~(1 << (col - 8));
LM4_GPIO_DIR(Q) |= 1 << (col - 8);
}
#else /* BDS definition */
/* Somehow the col 10 and 11 are swapped on bds. */
if (col == 10) {
col = 11;
} else if (col == 11) {
col = 10;
}
if (col < 0) {
/* All tri-stated */
LM4_GPIO_DIR(Q) = 0;
LM4_GPIO_DIR(K) &= ~0x0f;
LM4_GPIO_DIR(N) &= ~0x04;
} else if (col < 8) {
LM4_GPIO_DIR(Q) = 1 << col;
LM4_GPIO_DIR(K) &= ~0x0f;
LM4_GPIO_DIR(N) &= ~0x04;
LM4_GPIO_DATA_BITS(Q, 0xff << 2) = ~(1 << col);
} else if (col < 12) {
LM4_GPIO_DIR(Q) = 0;
LM4_GPIO_DIR(K) = (LM4_GPIO_DIR(K) & ~0x0f) | (1 << (col - 8));
LM4_GPIO_DIR(N) &= ~0x04;
LM4_GPIO_DATA_BITS(K, 0x0f << 2) = ~(1 << (col - 8));
} else { /* col == 12 */
LM4_GPIO_DIR(Q) = 0;
LM4_GPIO_DIR(K) &= ~0x0f;
LM4_GPIO_DIR(N) |= 0x04;
LM4_GPIO_DATA_BITS(N, 0x04 << 2) = ~0x04;
}
#endif
}
int keyboard_scan_init(void)
{
volatile uint32_t scratch __attribute__((unused));
int i;
/* Enable GPIOs */
#if defined(EVT)
/* Enable clock to GPIO modules C,H,K,N,P,Q */
LM4_SYSTEM_RCGCGPIO |= 0x7284;
#else
/* Enable clock to GPIO modules C,H,K,N,Q */
LM4_SYSTEM_RCGCGPIO |= 0x5284;
#endif
scratch = LM4_SYSTEM_RCGCGPIO;
/* Clear GPIOAFSEL and enable digital function for PC5, PH0:7,
* PK0:3, PN2, PQ0:7. */
LM4_GPIO_AFSEL(C) &= ~0x20;
LM4_GPIO_DEN(C) |= 0x20;
#if defined(EVT)
LM4_GPIO_AFSEL(N) &= 0xff; /* KSI[7:0] */
LM4_GPIO_DEN(N) |= 0xff;
LM4_GPIO_AFSEL(P) &= 0xff; /* KSO[7:0] */
LM4_GPIO_DEN(P) |= 0xff;
LM4_GPIO_AFSEL(Q) &= 0x1f; /* KSO[12:8] */
LM4_GPIO_DEN(Q) |= 0x1f;
#else
LM4_GPIO_AFSEL(H) = 0;
LM4_GPIO_DEN(H) = 0xff;
LM4_GPIO_AFSEL(K) &= ~0x0f;
LM4_GPIO_DEN(K) |= 0x0f;
LM4_GPIO_AFSEL(N) &= ~0x04;
LM4_GPIO_DEN(N) |= 0x04;
LM4_GPIO_AFSEL(Q) = 0;
LM4_GPIO_DEN(Q) = 0xff;
#endif
#if defined(EVT)
/* Set PN0:7 as inputs with pull-up */
LM4_GPIO_DIR(N) = 0;
LM4_GPIO_PUR(N) = 0xff;
#else
/* Set PH0:7 as inputs with pull-up */
LM4_GPIO_DIR(H) = 0;
LM4_GPIO_PUR(H) = 0xff;
#endif
/* Set PC5 as input with pull-up. */
/* TODO: no need for pull-up on real circuit, since it'll be
* externally pulled up. */
LM4_GPIO_DIR(C) &= ~0x04;
LM4_GPIO_PUR(C) |= 0x04;
/* Tri-state the columns */
select_column(-1);
/* Initialize raw state */
for (i = 0; i < KB_COLS; i++)
raw_state[i] = 0;
/* TODO: method to set which keyboard we have, so we set the actual
* key mask properly */
actual_key_mask = actual_key_masks[0];
return EC_SUCCESS;
}
void check_keys_down(void)
{
int c;
uint8_t r;
int change = 0;
for (c = 0; c < KB_COLS; c++) {
/* Select column, then wait a bit for it to settle */
select_column(c);
usleep(20);
/* Read the row state */
#if defined(EVT)
r = LM4_GPIO_DATA_BITS(N, 0xff << 2);
#else
r = LM4_GPIO_DATA_BITS(H, 0xff << 2);
#endif
/* Invert it so 0=not pressed, 1=pressed */
r ^= 0xff;
/* Mask off keys that don't exist so they never show
* as pressed */
r &= actual_key_mask[c];
#ifdef OR_WITH_CURRENT_STATE_FOR_TESTING
/* KLUDGE - or current state in, so we can make sure
* all the lines are hooked up */
r |= raw_state[c];
#endif
/* Check for changes */
if (r != raw_state[c]) {
int i;
for (i = 0; i < 8; ++i) {
uint8_t prev = (raw_state[c] >> i) & 1;
uint8_t now = (r >> i) & 1;
if (prev != now) {
keyboard_state_changed(i, c, now);
}
}
raw_state[c] = r;
change = 1;
}
}
select_column(-1);
if (change) {
uart_puts("[Keyboard state:");
for (c = 0; c < KB_COLS; c++) {
if (raw_state[c])
uart_printf(" %02x", raw_state[c]);
else
uart_puts(" --");
}
uart_puts("]\n");
}
}
void keyboard_scan_task(void)
{
keyboard_scan_init();
while (1) {
/* Sleep for a while */
usleep(25000);
/* Check for keys down */
check_keys_down();
}
}
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