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/* Copyright 2023 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "adc.h"
#include "ap_power/ap_power.h"
#include "base_state.h"
#include "chipset.h"
#include "console.h"
#include "hooks.h"
#include "tablet_mode.h"
#include <zephyr/drivers/gpio.h>
#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ##args)
#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ##args)
#define BASE_DETECT_INTERVAL (200 * MSEC)
#define ATTACH_MAX_THRESHOLD_MV 300
#define DETACH_MIN_THRESHOLD_MV 3000
static void base_update(bool attached)
{
const struct gpio_dt_spec *en_cc_lid_base_pu =
GPIO_DT_FROM_NODELABEL(en_cc_lid_base_pu);
base_set_state(attached);
tablet_set_mode(!attached, TABLET_TRIGGER_BASE);
gpio_pin_set_dt(GPIO_DT_FROM_NODELABEL(en_ppvar_base_x), attached);
gpio_pin_configure(en_cc_lid_base_pu->port, en_cc_lid_base_pu->pin,
attached ? GPIO_OUTPUT_HIGH : GPIO_INPUT);
}
static void base_detect_tick(void);
DECLARE_DEFERRED(base_detect_tick);
static void base_detect_tick(void)
{
static bool debouncing;
int mv = adc_read_channel(ADC_BASE_DET);
if (mv >= DETACH_MIN_THRESHOLD_MV && base_get_state()) {
if (!debouncing) {
debouncing = true;
} else {
debouncing = false;
base_update(false);
}
} else if (mv <= ATTACH_MAX_THRESHOLD_MV && !base_get_state()) {
if (!debouncing) {
debouncing = true;
} else {
debouncing = false;
base_update(true);
}
} else {
debouncing = false;
}
hook_call_deferred(&base_detect_tick_data, BASE_DETECT_INTERVAL);
}
static void base_detect_enable(bool enable)
{
if (enable) {
hook_call_deferred(&base_detect_tick_data,
BASE_DETECT_INTERVAL);
} else {
hook_call_deferred(&base_detect_tick_data, -1);
base_update(false);
}
}
static void base_startup_hook(struct ap_power_ev_callback *cb,
struct ap_power_ev_data data)
{
switch (data.event) {
case AP_POWER_STARTUP:
base_detect_enable(true);
break;
case AP_POWER_SHUTDOWN:
base_detect_enable(false);
break;
default:
return;
}
}
static int base_init(const struct device *unused)
{
static struct ap_power_ev_callback cb;
base_update(false);
ap_power_ev_init_callback(&cb, base_startup_hook,
AP_POWER_STARTUP | AP_POWER_SHUTDOWN);
ap_power_ev_add_callback(&cb);
if (!chipset_in_state(CHIPSET_STATE_ANY_OFF)) {
base_detect_enable(true);
}
return 0;
}
SYS_INIT(base_init, APPLICATION, 1);
void base_force_state(enum ec_set_base_state_cmd state)
{
switch (state) {
case EC_SET_BASE_STATE_ATTACH:
base_update(true);
base_detect_enable(false);
break;
case EC_SET_BASE_STATE_DETACH:
base_update(false);
base_detect_enable(false);
break;
case EC_SET_BASE_STATE_RESET:
base_detect_enable(true);
break;
}
}
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