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/* Copyright 2019 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.
*/
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "it8801.h"
#include "keyboard_raw.h"
#include "keyboard_scan.h"
#include "registers.h"
#include "task.h"
#define CPRINTS(format, args...) cprints(CC_KEYSCAN, format, ## args)
static int it8801_read(int reg, int *data)
{
return i2c_read8(I2C_PORT_IO_EXPANDER_IT8801, IT8801_I2C_ADDR,
reg, data);
}
static int it8801_write(int reg, int data)
{
return i2c_write8(I2C_PORT_IO_EXPANDER_IT8801, IT8801_I2C_ADDR,
reg, data);
}
struct it8801_vendor_id_t {
uint8_t chip_id;
uint8_t reg;
};
static const struct it8801_vendor_id_t it8801_vendor_id_verify[] = {
{ 0x12, IT8801_REG_HBVIDR},
{ 0x83, IT8801_REG_LBVIDR},
};
static int it8801_check_vendor_id(void)
{
int i, ret, val;
/* Verify vendor ID registers(16-bits). */
for (i = 0; i < ARRAY_SIZE(it8801_vendor_id_verify); i++) {
ret = it8801_read(it8801_vendor_id_verify[i].reg, &val);
if (ret != EC_SUCCESS)
return ret;
if (val != it8801_vendor_id_verify[i].chip_id)
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
void keyboard_raw_init(void)
{
int ret, val;
/* Verify Vendor ID registers. */
ret = it8801_check_vendor_id();
if (ret) {
CPRINTS("Failed to read IT8801 vendor id %x", ret);
return;
}
/* KSO alternate function switching(KSO[21:20, 18]). */
it8801_write(IT8801_REG_GPIO01_KSO18, IT8801_REG_MASK_GPIOAFS_FUNC2);
it8801_write(IT8801_REG_GPIO22_KSO21, IT8801_REG_MASK_GPIOAFS_FUNC2);
it8801_write(IT8801_REG_GPIO23_KSO20, IT8801_REG_MASK_GPIOAFS_FUNC2);
/* Start with KEYBOARD_COLUMN_ALL, KSO[22:11, 6:0] output low. */
it8801_write(IT8801_REG_KSOMCR, IT8801_REG_MASK_AKSOSC);
if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) {
/*
* Since most of the KSO pins can't drive up, we'll must use
* a pin capable of being a GPIO instead and use the GPIO
* feature to do the required inverted push pull.
*/
it8801_write(IT8801_REG_GPIO23_KSO20, IT8801_REG_MASK_GPIODIR);
/* Start with KEYBOARD_COLUMN_ALL, output high(so selected). */
it8801_read(IT8801_REG_GPIOG2SOVR, &val);
it8801_write(IT8801_REG_GPIOG2SOVR, val | IT8801_REG_GPIO23SOV);
}
/* Keyboard scan in interrupt enable register */
it8801_write(IT8801_REG_KSIIER, 0xff);
/* Gather KSI interrupt enable */
it8801_write(IT8801_REG_GIECR, IT8801_REG_MASK_GKSIIE);
/* Alert response enable */
it8801_write(IT8801_REG_SMBCR, IT8801_REG_MASK_ARE);
keyboard_raw_enable_interrupt(0);
}
void keyboard_raw_task_start(void)
{
keyboard_raw_enable_interrupt(1);
}
static const uint8_t kso_mapping[] = {
0, 1, 20, 3, 4, 5, 6, 17, 18, 16, 15, 11, 12,
#ifdef CONFIG_KEYBOARD_KEYPAD
13, 14
#endif
};
BUILD_ASSERT(ARRAY_SIZE(kso_mapping) == KEYBOARD_COLS_MAX);
test_mockable void keyboard_raw_drive_column(int col)
{
int kso_val, val;
/* Tri-state all outputs */
if (col == KEYBOARD_COLUMN_NONE) {
/* KSO[22:11, 6:0] output high */
kso_val = IT8801_REG_MASK_KSOSDIC | IT8801_REG_MASK_AKSOSC;
if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) {
/* Output low(so not selected). */
it8801_read(IT8801_REG_GPIOG2SOVR, &val);
it8801_write(IT8801_REG_GPIOG2SOVR, val &
~IT8801_REG_GPIO23SOV);
}
}
/* Assert all outputs */
else if (col == KEYBOARD_COLUMN_ALL) {
/* KSO[22:11, 6:0] output low */
kso_val = IT8801_REG_MASK_AKSOSC;
if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) {
/* Output high(so selected). */
it8801_read(IT8801_REG_GPIOG2SOVR, &val);
it8801_write(IT8801_REG_GPIOG2SOVR, val |
IT8801_REG_GPIO23SOV);
}
} else {
/* To check if column is valid or not. */
if (col >= KEYBOARD_COLS_MAX)
return;
/*
* Selected KSO[20, 18:11, 6:3, 1:0] output low,
* all others KSO output high.
*/
kso_val = kso_mapping[col];
if (IS_ENABLED(CONFIG_KEYBOARD_COL2_INVERTED)) {
/* GPIO23 is inverted. */
if (col == IT8801_REG_MASK_SELKSO2) {
/* Output high(so selected). */
it8801_read(IT8801_REG_GPIOG2SOVR, &val);
it8801_write(IT8801_REG_GPIOG2SOVR, val |
IT8801_REG_GPIO23SOV);
} else {
/* Output low(so not selected). */
it8801_read(IT8801_REG_GPIOG2SOVR, &val);
it8801_write(IT8801_REG_GPIOG2SOVR, val &
~IT8801_REG_GPIO23SOV);
}
}
}
it8801_write(IT8801_REG_KSOMCR, kso_val);
}
test_mockable int keyboard_raw_read_rows(void)
{
int data = 0;
int ksieer = 0;
it8801_read(IT8801_REG_KSIDR, &data);
/* This register needs to write clear after reading data */
it8801_read(IT8801_REG_KSIEER, &ksieer);
it8801_write(IT8801_REG_KSIEER, ksieer);
/* Bits are active-low, so invert returned levels */
return (~data) & 0xff;
}
void keyboard_raw_enable_interrupt(int enable)
{
if (enable) {
it8801_write(IT8801_REG_KSIEER, 0xff);
gpio_clear_pending_interrupt(GPIO_IT8801_SMB_INT);
gpio_enable_interrupt(GPIO_IT8801_SMB_INT);
} else {
gpio_disable_interrupt(GPIO_IT8801_SMB_INT);
}
}
void io_expander_it8801_interrupt(enum gpio_signal signal)
{
/* Wake the scan task */
task_wake(TASK_ID_KEYSCAN);
}
static void dump_register(int reg)
{
int rv;
int data;
ccprintf("[%Xh] = ", reg);
rv = it8801_read(reg, &data);
if (!rv)
ccprintf("0x%02x\n", data);
else
ccprintf("ERR (%d)\n", rv);
}
static int it8801_dump(int argc, char **argv)
{
dump_register(IT8801_REG_KSIIER);
dump_register(IT8801_REG_KSIEER);
dump_register(IT8801_REG_KSIDR);
dump_register(IT8801_REG_KSOMCR);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(it8801_dump, it8801_dump, "NULL",
"Dumps IT8801 registers");
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