1/*
2 * Copyright 2013 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 <fcntl.h>
18#include <errno.h>
19#include <math.h>
20#include <poll.h>
21#include <unistd.h>
22#include <dirent.h>
23#include <sys/select.h>
24
25#include <cutils/log.h>
26
27#include "sensors.h"
28#include "ProximitySensor.h"
29
30/*****************************************************************************/
31
32ProximitySensor::ProximitySensor()
33    : SensorBase(NULL, PROXIMITY_DATA),
34      mEnabled(0),
35      mInputReader(4),
36      mHasPendingEvent(false)
37{
38    mPendingEvent.sensor = ID_PX;
39    mPendingEvent.type = SENSOR_TYPE_PROXIMITY;
40    memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
41}
42
43ProximitySensor::~ProximitySensor()
44{
45}
46
47int ProximitySensor::setInitialState()
48{
49    return 0;
50}
51
52int ProximitySensor::enable(int32_t, int en)
53{
54    int newState = en ? 1 : 0;
55    int err = 0;
56
57    if (newState != mEnabled) {
58        if (!mEnabled && dev_name != NULL) {
59            open_device();
60        }
61
62        char sysfs[PATH_MAX];
63
64        strcpy(sysfs, I2C);
65        strcat(sysfs, "enable_ps_sensor");
66
67        ALOGI_IF(DEBUG, "enable.open(%s), en(%d)", sysfs, en);
68
69        int fd = open(sysfs, O_RDWR);
70        if (fd < 0) {
71            ALOGE("couldn't open '%s' input device", sysfs);
72            err = -1;
73        } else {
74            char buf[2];
75
76            buf[0] = newState ? '1' : '0';
77            buf[1] = '\0';
78
79            write(fd, buf, sizeof(buf));
80            close(fd);
81            setInitialState();
82        }
83
84        mEnabled = newState;
85
86        if (!mEnabled && dev_name != NULL) {
87            close_device();
88        }
89    }
90    return err;
91}
92
93bool ProximitySensor::hasPendingEvents() const
94{
95    return mHasPendingEvent;
96}
97
98int ProximitySensor::readEvents(sensors_event_t* data, int count)
99{
100    if (count < 1)
101        return -EINVAL;
102
103    if (mHasPendingEvent) {
104        mHasPendingEvent = false;
105        mPendingEvent.timestamp = getTimestamp();
106        *data = mPendingEvent;
107        return mEnabled ? 1 : 0;
108    }
109
110    ssize_t n = mInputReader.fill(data_fd);
111    if (n < 0)
112        return n;
113
114    int numEventReceived = 0;
115    input_event const* event;
116
117    while (count && mInputReader.readEvent(&event)) {
118        int type = event->type;
119        if (type == EV_ABS) {
120            if (event->code == ABS_DISTANCE) {
121                mPendingEvent.sensor = ID_PX;
122                mPendingEvent.type = SENSOR_TYPE_PROXIMITY;
123                mPendingEvent.distance = (float) event->value;
124            }
125        } else if (type == EV_SYN) {
126            mPendingEvent.timestamp = timevalToNano(event->time);
127
128            if (mEnabled) {
129                *data++ = mPendingEvent;
130                count--;
131                numEventReceived++;
132            }
133        } else {
134            ALOGE("ProximitySensor: unknown event (type=%d, code=%d)",
135                    type, event->code);
136        }
137        mInputReader.next();
138    }
139
140    return numEventReceived;
141}
142
143float ProximitySensor::indexToValue(size_t index) const
144{
145    //return index * PROXIMITY_THRESHOLD_CM;
146    return index;
147}
148