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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 "adc.h"
#include "board.h"
#include "charge_manager.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "timer.h"
#include "usb_pd.h"
#include "util.h"
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
/* Krane base detection code */
/* Base detection and debouncing */
#define BASE_DETECT_DEBOUNCE_US (20 * MSEC)
/*
* If the base status is unclear (i.e. not within expected ranges, read
* the ADC value again every 500ms.
*/
#define BASE_DETECT_RETRY_US (500 * MSEC)
enum kukui_pogo_device_type {
DEVICE_TYPE_ERROR = -2,
DEVICE_TYPE_UNKNOWN = -1,
DEVICE_TYPE_DETACHED = 0,
DEVICE_TYPE_DOCK = 1,
DEVICE_TYPE_KEYBOARD = 2,
DEVICE_TYPE_COUNT,
};
struct {
int mv_low, mv_high;
} static const pogo_detect_table[] = {
[DEVICE_TYPE_DETACHED] = {2700, 3500}, /* 10K, NC, around 3.3V */
[DEVICE_TYPE_DOCK] = {141, 173}, /* 10K, 0.5K ohm */
[DEVICE_TYPE_KEYBOARD] = {270, 400}, /* 10K, 1K ohm */
};
BUILD_ASSERT(ARRAY_SIZE(pogo_detect_table) == DEVICE_TYPE_COUNT);
static uint64_t base_detect_debounce_time;
static enum kukui_pogo_device_type get_device_type(int mv)
{
int i;
if (mv == ADC_READ_ERROR)
return DEVICE_TYPE_ERROR;
for (i = 0; i < DEVICE_TYPE_COUNT; i++) {
if (pogo_detect_table[i].mv_low <= mv &&
mv <= pogo_detect_table[i].mv_high)
return i;
}
return DEVICE_TYPE_UNKNOWN;
}
static void enable_charge(int enable)
{
if (enable) {
struct charge_port_info info = {
.voltage = 5000, .current = 1500};
/*
* Set supplier type to PD to have same priority as type c
* port.
*/
charge_manager_update_charge(
CHARGE_SUPPLIER_DEDICATED, CHARGE_PORT_POGO, &info);
} else {
charge_manager_update_charge(
CHARGE_SUPPLIER_DEDICATED, CHARGE_PORT_POGO, NULL);
}
pd_send_host_event(PD_EVENT_POWER_CHANGE);
}
static void enable_power_supply(int enable)
{
gpio_set_level(GPIO_EN_PP3300_POGO, enable);
}
static void base_detect_deferred(void);
DECLARE_DEFERRED(base_detect_deferred);
static void base_detect_deferred(void)
{
uint64_t time_now = get_time().val;
int mv;
int device_type;
if (base_detect_debounce_time > time_now) {
hook_call_deferred(&base_detect_deferred_data,
base_detect_debounce_time - time_now);
return;
}
/*
* Disable interrupt first to prevent it triggered by value
* changed from 1 to disabled state(=0).
*/
gpio_disable_interrupt(GPIO_POGO_ADC_INT_L);
gpio_set_flags(GPIO_POGO_ADC_INT_L, GPIO_ANALOG);
mv = adc_read_channel(ADC_POGO_ADC_INT_L);
/* restore the pin function */
gpio_set_flags(GPIO_POGO_ADC_INT_L, GPIO_INT_BOTH);
gpio_enable_interrupt(GPIO_POGO_ADC_INT_L);
device_type = get_device_type(mv);
CPRINTS("POGO: adc=%d, device_type=%d", mv, device_type);
switch (device_type) {
case DEVICE_TYPE_ERROR:
case DEVICE_TYPE_UNKNOWN:
hook_call_deferred(&base_detect_deferred_data,
BASE_DETECT_RETRY_US);
break;
case DEVICE_TYPE_DETACHED:
enable_power_supply(0);
enable_charge(0);
break;
case DEVICE_TYPE_DOCK:
enable_power_supply(0);
enable_charge(1);
break;
case DEVICE_TYPE_KEYBOARD:
enable_charge(0);
enable_power_supply(1);
break;
case DEVICE_TYPE_COUNT:
/* should not happen */
break;
}
}
void pogo_adc_interrupt(enum gpio_signal signal)
{
uint64_t time_now = get_time().val;
if (base_detect_debounce_time <= time_now) {
hook_call_deferred(&base_detect_deferred_data,
BASE_DETECT_DEBOUNCE_US);
}
base_detect_debounce_time = time_now + BASE_DETECT_DEBOUNCE_US;
}
static void base_init(void)
{
hook_call_deferred(&base_detect_deferred_data, 0);
}
DECLARE_HOOK(HOOK_INIT, base_init, HOOK_PRIO_INIT_ADC + 1);
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