1/*
2 * Copyright (C) 2011 Samsung
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 <fcntl.h>
18#include <errno.h>
19#include <math.h>
20#include <poll.h>
21#include <fcntl.h>
22#include <unistd.h>
23#include <dirent.h>
24#include <sys/select.h>
25#include <cutils/log.h>
26#include <pthread.h>
27
28#include "SamsungSensorBase.h"
29
30char *SamsungSensorBase::makeSysfsName(const char *input_name,
31                                       const char *file_name) {
32    char *name;
33    int length = strlen("/sys/class/input/") +
34        strlen(input_name) +
35        strlen("/device/") +
36        strlen(file_name);
37
38    name = new char[length + 1];
39    if (name) {
40        strcpy(name, "/sys/class/input/");
41        strcat(name, input_name);
42        strcat(name, "/device/");
43        strcat(name, file_name);
44    }
45
46    return name;
47}
48
49bool SamsungSensorBase::handleEvent(input_event const * event) {
50    return true;
51}
52
53int SamsungSensorBase::handleEnable(int en) {
54    return 0;
55}
56
57SamsungSensorBase::SamsungSensorBase(const char *dev_name,
58                                     const char *data_name,
59                                     int sensor_code)
60    : SensorBase(dev_name, data_name),
61      mEnabled(true),
62      mHasPendingEvent(false),
63      mInputReader(4),
64      mSensorCode(sensor_code),
65      mLock(PTHREAD_MUTEX_INITIALIZER)
66{
67    mPendingEvent.version = sizeof(sensors_event_t);
68    memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
69    if (!data_fd)
70        return;
71    mInputSysfsEnable = makeSysfsName(input_name, "enable");
72    if (!mInputSysfsEnable) {
73        ALOGE("%s: unable to allocate mem for %s:enable", __func__,
74             data_name);
75        return;
76    }
77    mInputSysfsPollDelay = makeSysfsName(input_name, "poll_delay");
78    if (!mInputSysfsPollDelay) {
79        ALOGE("%s: unable to allocate mem for %s:poll_delay", __func__,
80             data_name);
81        return;
82    }
83
84    int flags = fcntl(data_fd, F_GETFL, 0);
85    fcntl(data_fd, F_SETFL, flags | O_NONBLOCK);
86
87    enable(0, 0);
88}
89
90SamsungSensorBase::~SamsungSensorBase() {
91    if (mEnabled) {
92        enable(0, 0);
93    }
94    delete[] mInputSysfsEnable;
95    delete[] mInputSysfsPollDelay;
96}
97
98int SamsungSensorBase::enable(int32_t handle, int en)
99{
100    int err = 0;
101    pthread_mutex_lock(&mLock);
102    if (en != mEnabled) {
103        int fd;
104        fd = open(mInputSysfsEnable, O_RDWR);
105        if (fd >= 0) {
106            err = write(fd, en ? "1" : "0", 2);
107            close(fd);
108            if (err < 0) {
109                goto cleanup;
110            }
111            mEnabled = en;
112            err = handleEnable(en);
113        } else {
114            err = -1;
115        }
116    }
117cleanup:
118    pthread_mutex_unlock(&mLock);
119    return err;
120}
121
122int SamsungSensorBase::setDelay(int32_t handle, int64_t ns)
123{
124    int fd;
125    int result = 0;
126    char buf[21];
127    pthread_mutex_lock(&mLock);
128    fd = open(mInputSysfsPollDelay, O_RDWR);
129    if (fd < 0) {
130        result = -1;
131        goto done;
132    }
133    sprintf(buf, "%lld", ns);
134    write(fd, buf, strlen(buf)+1);
135    close(fd);
136done:
137    pthread_mutex_unlock(&mLock);
138    return result;
139}
140
141int SamsungSensorBase::readEvents(sensors_event_t* data, int count)
142{
143    if (count < 1)
144        return -EINVAL;
145
146    pthread_mutex_lock(&mLock);
147    int numEventReceived = 0;
148
149    if (mHasPendingEvent) {
150        mHasPendingEvent = false;
151        if (mEnabled) {
152            mPendingEvent.timestamp = getTimestamp();
153            *data = mPendingEvent;
154            numEventReceived++;
155        }
156        goto done;
157    }
158
159    input_event const* event;
160    while (count && mInputReader.readEvent(data_fd, &event)) {
161        if (event->type == EV_ABS) {
162            if (event->code == mSensorCode) {
163                if (mEnabled && handleEvent(event)) {
164                    mPendingEvent.timestamp = timevalToNano(event->time);
165                    *data++ = mPendingEvent;
166                    count--;
167                    numEventReceived++;
168                }
169            }
170        }
171        mInputReader.next();
172    }
173
174done:
175    pthread_mutex_unlock(&mLock);
176    return numEventReceived;
177
178}
179