blob: d027b3d2216002d0a3da71fc9669f259d9a03465 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* Copyright (c) 2013 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.
*/
/* Pure GPIO-based external power detection */
#include "common.h"
#include "extpower.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "timer.h"
#define EXTPOWER_DEBOUNCE_US (30 * MSEC)
static int debounced_extpower_presence;
int extpower_is_present(void)
{
return debounced_extpower_presence;
}
/**
* Deferred function to handle external power change
*/
static void extpower_deferred(void)
{
int extpower_presence = gpio_get_level(GPIO_AC_PRESENT);
if (extpower_presence == debounced_extpower_presence)
return;
debounced_extpower_presence = extpower_presence;
hook_notify(HOOK_AC_CHANGE);
/* Forward notification to host */
if (extpower_presence)
host_set_single_event(EC_HOST_EVENT_AC_CONNECTED);
else
host_set_single_event(EC_HOST_EVENT_AC_DISCONNECTED);
}
DECLARE_DEFERRED(extpower_deferred);
void extpower_interrupt(enum gpio_signal signal)
{
/* Trigger deferred notification of external power change */
hook_call_deferred(extpower_deferred, EXTPOWER_DEBOUNCE_US);
}
static void extpower_init(void)
{
debounced_extpower_presence = gpio_get_level(GPIO_AC_PRESENT);
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_AC_PRESENT);
}
DECLARE_HOOK(HOOK_INIT, extpower_init, HOOK_PRIO_INIT_EXTPOWER);
|
