Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <stddef.h> |
| 20 | #include <string.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #define LOG_TAG "libsuspend" |
| 26 | #include <cutils/log.h> |
| 27 | |
| 28 | #include "autosuspend_ops.h" |
| 29 | |
| 30 | #define EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state" |
| 31 | #define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep" |
| 32 | #define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake" |
| 33 | |
| 34 | |
| 35 | static int sPowerStatefd; |
| 36 | static const char *pwr_state_mem = "mem"; |
| 37 | static const char *pwr_state_on = "on"; |
| 38 | |
| 39 | static int autosuspend_earlysuspend_enable(void) |
| 40 | { |
| 41 | char buf[80]; |
| 42 | int ret; |
| 43 | |
| 44 | ALOGV("autosuspend_earlysuspend_enable\n"); |
| 45 | |
| 46 | ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem)); |
| 47 | if (ret < 0) { |
| 48 | strerror_r(errno, buf, sizeof(buf)); |
| 49 | ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 50 | goto err; |
| 51 | } |
| 52 | |
| 53 | ALOGV("autosuspend_earlysuspend_enable done\n"); |
| 54 | |
| 55 | return 0; |
| 56 | |
| 57 | err: |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | static int autosuspend_earlysuspend_disable(void) |
| 62 | { |
| 63 | char buf[80]; |
| 64 | int ret; |
| 65 | |
| 66 | ALOGV("autosuspend_earlysuspend_disable\n"); |
| 67 | |
| 68 | ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on)); |
| 69 | if (ret < 0) { |
| 70 | strerror_r(errno, buf, sizeof(buf)); |
| 71 | ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 72 | goto err; |
| 73 | } |
| 74 | |
| 75 | ALOGV("autosuspend_earlysuspend_disable done\n"); |
| 76 | |
| 77 | return 0; |
| 78 | |
| 79 | err: |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | struct autosuspend_ops autosuspend_earlysuspend_ops = { |
| 84 | .enable = autosuspend_earlysuspend_enable, |
| 85 | .disable = autosuspend_earlysuspend_disable, |
| 86 | }; |
| 87 | |
| 88 | struct autosuspend_ops *autosuspend_earlysuspend_init(void) |
| 89 | { |
| 90 | char buf[80]; |
| 91 | int ret; |
| 92 | |
| 93 | ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK); |
| 94 | if (ret < 0) { |
| 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK); |
| 99 | if (ret < 0) { |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR); |
| 104 | |
| 105 | if (sPowerStatefd < 0) { |
| 106 | strerror_r(errno, buf, sizeof(buf)); |
| 107 | ALOGE("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 108 | return NULL; |
| 109 | } |
| 110 | |
| 111 | ALOGI("Selected early suspend\n"); |
| 112 | return &autosuspend_earlysuspend_ops; |
| 113 | } |