1 /*
2 * Copyright (c) 2022 The Chromium OS Authors
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include "usbc_timer.h"
8
9 /** Timer flag to track if timer was started */
10 #define TIMER_STARTED 0
11 /** Timer flag to track if timer has expired */
12 #define TIMER_EXPIRED 1
13
14 /**
15 * @brief The timer function that's executed when the timer expires
16 */
usbc_timer_handler(struct k_timer * timer)17 static void usbc_timer_handler(struct k_timer *timer)
18 {
19 struct usbc_timer_t *usbc_timer = k_timer_user_data_get(timer);
20
21 atomic_set_bit(&usbc_timer->flags, TIMER_EXPIRED);
22 }
23
usbc_timer_init(struct usbc_timer_t * usbc_timer,uint32_t timeout_ms)24 void usbc_timer_init(struct usbc_timer_t *usbc_timer, uint32_t timeout_ms)
25 {
26 k_timer_init(&usbc_timer->timer, usbc_timer_handler, NULL);
27 k_timer_user_data_set(&usbc_timer->timer, usbc_timer);
28 usbc_timer->timeout_ms = timeout_ms;
29 }
30
usbc_timer_start(struct usbc_timer_t * usbc_timer)31 void usbc_timer_start(struct usbc_timer_t *usbc_timer)
32 {
33 atomic_clear_bit(&usbc_timer->flags, TIMER_EXPIRED);
34 atomic_set_bit(&usbc_timer->flags, TIMER_STARTED);
35 k_timer_start(&usbc_timer->timer, K_MSEC(usbc_timer->timeout_ms), K_NO_WAIT);
36 }
37
usbc_timer_expired(struct usbc_timer_t * usbc_timer)38 bool usbc_timer_expired(struct usbc_timer_t *usbc_timer)
39 {
40 bool started = atomic_test_bit(&usbc_timer->flags, TIMER_STARTED);
41 bool expired = atomic_test_bit(&usbc_timer->flags, TIMER_EXPIRED);
42
43 if (started & expired) {
44 atomic_clear_bit(&usbc_timer->flags, TIMER_STARTED);
45 return true;
46 }
47
48 return false;
49 }
50
usbc_timer_running(struct usbc_timer_t * usbc_timer)51 bool usbc_timer_running(struct usbc_timer_t *usbc_timer)
52 {
53 return atomic_test_bit(&usbc_timer->flags, TIMER_STARTED);
54 }
55
usbc_timer_stop(struct usbc_timer_t * usbc_timer)56 void usbc_timer_stop(struct usbc_timer_t *usbc_timer)
57 {
58 atomic_clear_bit(&usbc_timer->flags, TIMER_STARTED);
59 k_timer_stop(&usbc_timer->timer);
60 }
61
