1 /*
2 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
3
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above
10 * copyright notice, this list of conditions and the following
11 * disclaimer in the documentation and/or other materials provided
12 * with the distribution.
13 * * Neither the name of The Linux Foundation nor the names of its
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "idle_invalidator.h"
31 #include <unistd.h>
32 #include <poll.h>
33 #include <string.h>
34 #include <fcntl.h>
35
36 #define II_DEBUG 0
37 #define IDLE_NOTIFY_PATH "/sys/devices/virtual/graphics/fb0/idle_notify"
38 #define IDLE_TIME_PATH "/sys/devices/virtual/graphics/fb0/idle_time"
39
40
41 static const char *threadName = "IdleInvalidator";
42 InvalidatorHandler IdleInvalidator::mHandler = NULL;
43 android::sp<IdleInvalidator> IdleInvalidator::sInstance(0);
44
IdleInvalidator()45 IdleInvalidator::IdleInvalidator(): Thread(false), mHwcContext(0),
46 mTimeoutEventFd(-1) {
47 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s", __FUNCTION__);
48 }
49
init(InvalidatorHandler reg_handler,void * user_data,unsigned int idleSleepTime)50 int IdleInvalidator::init(InvalidatorHandler reg_handler, void* user_data,
51 unsigned int idleSleepTime) {
52 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s idleSleepTime %d",
53 __FUNCTION__, idleSleepTime);
54 mHandler = reg_handler;
55 mHwcContext = user_data;
56
57 // Open a sysfs node to receive the timeout notification from driver.
58 mTimeoutEventFd = open(IDLE_NOTIFY_PATH, O_RDONLY);
59 if (mTimeoutEventFd < 0) {
60 ALOGE ("%s:not able to open %s node %s",
61 __FUNCTION__, IDLE_NOTIFY_PATH, strerror(errno));
62 return -1;
63 }
64
65 // Open a sysfs node to send the timeout value to driver.
66 int fd = open(IDLE_TIME_PATH, O_WRONLY);
67 if (fd < 0) {
68 ALOGE ("%s:not able to open %s node %s",
69 __FUNCTION__, IDLE_TIME_PATH, strerror(errno));
70 close(mTimeoutEventFd);
71 mTimeoutEventFd = -1;
72 return -1;
73 }
74 char strSleepTime[64];
75 snprintf(strSleepTime, sizeof(strSleepTime), "%d", idleSleepTime);
76 // Notify driver about the timeout value
77 ssize_t len = pwrite(fd, strSleepTime, strlen(strSleepTime), 0);
78 if(len < -1) {
79 ALOGE ("%s:not able to write into %s node %s",
80 __FUNCTION__, IDLE_TIME_PATH, strerror(errno));
81 close(mTimeoutEventFd);
82 mTimeoutEventFd = -1;
83 close(fd);
84 return -1;
85 }
86 close(fd);
87
88 //Triggers the threadLoop to run, if not already running.
89 run(threadName, android::PRIORITY_LOWEST);
90 return 0;
91 }
92
threadLoop()93 bool IdleInvalidator::threadLoop() {
94 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s", __FUNCTION__);
95 struct pollfd pFd;
96 pFd.fd = mTimeoutEventFd;
97 if (pFd.fd >= 0)
98 pFd.events = POLLPRI | POLLERR;
99 // Poll for an timeout event from driver
100 int err = poll(&pFd, 1, -1);
101 if(err > 0) {
102 if (pFd.revents & POLLPRI) {
103 char data[64];
104 // Consume the node by reading it
105 ssize_t len = pread(pFd.fd, data, 64, 0);
106 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s Idle Timeout fired len %zd",
107 __FUNCTION__, len);
108 mHandler((void*)mHwcContext);
109 }
110 }
111 return true;
112 }
113
readyToRun()114 int IdleInvalidator::readyToRun() {
115 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s", __FUNCTION__);
116 return 0; /*NO_ERROR*/
117 }
118
onFirstRef()119 void IdleInvalidator::onFirstRef() {
120 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s", __FUNCTION__);
121 }
122
getInstance()123 IdleInvalidator *IdleInvalidator::getInstance() {
124 ALOGD_IF(II_DEBUG, "IdleInvalidator::%s", __FUNCTION__);
125 if(sInstance.get() == NULL)
126 sInstance = new IdleInvalidator();
127 return sInstance.get();
128 }
129