1/*
2 * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 *    conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 *    of conditions and the following disclaimer in the documentation and/or other materials
13 *    provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 *    to endorse or promote products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "linux/wakelock.h"
33#include "los_spinlock.h"
34
35
36#define SET_BIT(bitmap, pos) ((bitmap) |= (1u << (pos)))
37#define CLEAR_BIT(bitmap, pos) ((bitmap) &= ~(1u << (pos)))
38#define CHECK_BIT(bitmap, pos) (((bitmap) & (1u << (pos))) ? 1 : 0)
39
40#define WAKELOCK_BITMAP_CNT 32
41
42/* spinlock for wake lock module only available on SMP mode */
43LITE_OS_SEC_BSS SPIN_LOCK_INIT(g_wakeLockSpin);
44
45typedef struct {
46    UINT32 lock; /* Indicate which bit is locked */
47    UINT32 used; /* Indicate used bit */
48} WakeLockBitmap;
49
50STATIC WakeLockBitmap g_wlBitmap;
51
52STATIC INT32 FindEmptyBit(UINT32 bitmap)
53{
54    UINT32 t = 1;
55    INT32 i;
56    for (i = 0; i < WAKELOCK_BITMAP_CNT; i++) {
57        if (!(t & bitmap)) {
58            break;
59        } else {
60            t <<= 1;
61        }
62    }
63
64    if (i == WAKELOCK_BITMAP_CNT) {
65        return -1;
66    }
67    return i;
68}
69
70/*
71 * Initial a wakelock
72 * Attention: DO NOT init more than 32 wakelock!
73 */
74void linux_wake_lock_init(struct wake_lock *lock, int type, const char *name)
75{
76    UINT32 intSave;
77    INT32 pos;
78    (VOID)type;
79
80    if (lock == NULL) {
81        PRINT_ERR("%s : invalid parameter!\n", __FUNCTION__);
82        return;
83    }
84
85    lock->ws.name = name;
86
87    LOS_SpinLockSave(&g_wakeLockSpin, &intSave);
88    pos = FindEmptyBit(g_wlBitmap.used);
89    if (pos != -1) {
90        lock->bitmap_pos = (UINT32)pos;
91        SET_BIT(g_wlBitmap.used, lock->bitmap_pos);
92        CLEAR_BIT(g_wlBitmap.lock, lock->bitmap_pos);
93    } else {
94        LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
95        PRINT_ERR("%s : wakelock count exceeds 32!\n", __FUNCTION__);
96        return;
97    }
98
99    LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
100}
101
102void linux_wake_lock(struct wake_lock *lock)
103{
104    UINT32 intSave;
105    if (lock == NULL) {
106        return;
107    }
108
109    LOS_SpinLockSave(&g_wakeLockSpin, &intSave);
110    SET_BIT(g_wlBitmap.lock, lock->bitmap_pos);
111    LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
112}
113
114void linux_wake_unlock(struct wake_lock *lock)
115{
116    UINT32 intSave;
117    if (lock == NULL) {
118        return;
119    }
120
121    LOS_SpinLockSave(&g_wakeLockSpin, &intSave);
122    CLEAR_BIT(g_wlBitmap.lock, lock->bitmap_pos);
123    LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
124}
125
126/* Judge whether the wake lock is active or not */
127int linux_wake_lock_active(struct wake_lock *lock)
128{
129    INT32 ret;
130    UINT32 intSave;
131    if (lock == NULL) {
132        return -1;
133    }
134    LOS_SpinLockSave(&g_wakeLockSpin, &intSave);
135    ret = CHECK_BIT(g_wlBitmap.lock, lock->bitmap_pos);
136    LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
137    return ret;
138}
139
140void linux_wake_lock_destroy(struct wake_lock *lock)
141{
142    UINT32 intSave;
143    if (lock == NULL) {
144        return;
145    }
146    LOS_SpinLockSave(&g_wakeLockSpin, &intSave);
147    CLEAR_BIT(g_wlBitmap.used, lock->bitmap_pos);
148    CLEAR_BIT(g_wlBitmap.lock, lock->bitmap_pos);
149    LOS_SpinUnlockRestore(&g_wakeLockSpin, intSave);
150}
151
152