SensorDevice.cpp revision ba02cd2f6cc3f59adf66cb2b9176bfe6c9e382d1 
1/*
2 * Copyright (C) 2010 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 <stdint.h>
18#include <math.h>
19#include <sys/types.h>
20
21#include <utils/Atomic.h>
22#include <utils/Errors.h>
23#include <utils/Singleton.h>
24
25#include <binder/BinderService.h>
26#include <binder/Parcel.h>
27#include <binder/IServiceManager.h>
28
29#include <hardware/sensors.h>
30
31#include "SensorDevice.h"
32#include "SensorService.h"
33
34namespace android {
35// ---------------------------------------------------------------------------
36
37ANDROID_SINGLETON_STATIC_INSTANCE(SensorDevice)
38
39SensorDevice::SensorDevice()
40    :  mSensorDevice(0),
41       mSensorModule(0)
42{
43    status_t err = hw_get_module(SENSORS_HARDWARE_MODULE_ID,
44            (hw_module_t const**)&mSensorModule);
45
46    ALOGE_IF(err, "couldn't load %s module (%s)",
47            SENSORS_HARDWARE_MODULE_ID, strerror(-err));
48
49    if (mSensorModule) {
50        err = sensors_open(&mSensorModule->common, &mSensorDevice);
51
52        ALOGE_IF(err, "couldn't open device for module %s (%s)",
53                SENSORS_HARDWARE_MODULE_ID, strerror(-err));
54
55        if (mSensorDevice) {
56            sensor_t const* list;
57            ssize_t count = mSensorModule->get_sensors_list(mSensorModule, &list);
58            mActivationCount.setCapacity(count);
59            Info model;
60            for (size_t i=0 ; i<size_t(count) ; i++) {
61                mActivationCount.add(list[i].handle, model);
62                mSensorDevice->activate(mSensorDevice, list[i].handle, 0);
63            }
64        }
65    }
66}
67
68void SensorDevice::dump(String8& result)
69{
70    if (!mSensorModule) return;
71    sensor_t const* list;
72    ssize_t count = mSensorModule->get_sensors_list(mSensorModule, &list);
73
74    result.appendFormat("%d h/w sensors:\n", int(count));
75
76    Mutex::Autolock _l(mLock);
77    for (size_t i=0 ; i<size_t(count) ; i++) {
78        const Info& info = mActivationCount.valueFor(list[i].handle);
79        result.appendFormat("handle=0x%08x, active-count=%d, rates(ms)={ ",
80                list[i].handle,
81                info.rates.size());
82        for (size_t j=0 ; j<info.rates.size() ; j++) {
83            result.appendFormat("%4.1f%s",
84                    info.rates.valueAt(j) / 1e6f,
85                    j<info.rates.size()-1 ? ", " : "");
86        }
87        result.appendFormat(" }, selected=%4.1f ms\n",  info.delay / 1e6f);
88    }
89}
90
91ssize_t SensorDevice::getSensorList(sensor_t const** list) {
92    if (!mSensorModule) return NO_INIT;
93    ssize_t count = mSensorModule->get_sensors_list(mSensorModule, list);
94    return count;
95}
96
97status_t SensorDevice::initCheck() const {
98    return mSensorDevice && mSensorModule ? NO_ERROR : NO_INIT;
99}
100
101ssize_t SensorDevice::poll(sensors_event_t* buffer, size_t count) {
102    if (!mSensorDevice) return NO_INIT;
103    ssize_t c;
104    do {
105        c = mSensorDevice->poll(mSensorDevice, buffer, count);
106    } while (c == -EINTR);
107    return c;
108}
109
110status_t SensorDevice::resetStateWithoutActuatingHardware(void *ident, int handle)
111{
112    if (!mSensorDevice) return NO_INIT;
113    Info& info( mActivationCount.editValueFor(handle));
114    Mutex::Autolock _l(mLock);
115    info.rates.removeItem(ident);
116    return NO_ERROR;
117}
118
119status_t SensorDevice::activate(void* ident, int handle, int enabled)
120{
121    if (!mSensorDevice) return NO_INIT;
122    status_t err(NO_ERROR);
123    bool actuateHardware = false;
124
125    Info& info( mActivationCount.editValueFor(handle) );
126
127
128    ALOGD_IF(DEBUG_CONNECTIONS,
129            "SensorDevice::activate: ident=%p, handle=0x%08x, enabled=%d, count=%d",
130            ident, handle, enabled, info.rates.size());
131
132    if (enabled) {
133        Mutex::Autolock _l(mLock);
134        ALOGD_IF(DEBUG_CONNECTIONS, "... index=%ld",
135                info.rates.indexOfKey(ident));
136
137        if (info.rates.indexOfKey(ident) < 0) {
138            info.rates.add(ident, DEFAULT_EVENTS_PERIOD);
139            if (info.rates.size() == 1) {
140                actuateHardware = true;
141            }
142        } else {
143            // sensor was already activated for this ident
144        }
145    } else {
146        Mutex::Autolock _l(mLock);
147        ALOGD_IF(DEBUG_CONNECTIONS, "... index=%ld",
148                info.rates.indexOfKey(ident));
149
150        ssize_t idx = info.rates.removeItem(ident);
151        if (idx >= 0) {
152            if (info.rates.size() == 0) {
153                actuateHardware = true;
154            }
155        } else {
156            // sensor wasn't enabled for this ident
157        }
158    }
159
160    if (actuateHardware) {
161        ALOGD_IF(DEBUG_CONNECTIONS, "\t>>> actuating h/w");
162
163        err = mSensorDevice->activate(mSensorDevice, handle, enabled);
164        ALOGE_IF(err, "Error %s sensor %d (%s)",
165                enabled ? "activating" : "disabling",
166                handle, strerror(-err));
167    }
168
169    { // scope for the lock
170        Mutex::Autolock _l(mLock);
171        nsecs_t ns = info.selectDelay();
172        mSensorDevice->setDelay(mSensorDevice, handle, ns);
173    }
174
175    return err;
176}
177
178status_t SensorDevice::setDelay(void* ident, int handle, int64_t ns)
179{
180    if (!mSensorDevice) return NO_INIT;
181    Mutex::Autolock _l(mLock);
182    Info& info( mActivationCount.editValueFor(handle) );
183    status_t err = info.setDelayForIdent(ident, ns);
184    if (err < 0) return err;
185    ns = info.selectDelay();
186    return mSensorDevice->setDelay(mSensorDevice, handle, ns);
187}
188
189int SensorDevice::getHalDeviceVersion() const {
190    if (!mSensorDevice) return -1;
191
192    return mSensorDevice->common.version;
193}
194
195// ---------------------------------------------------------------------------
196
197status_t SensorDevice::Info::setDelayForIdent(void* ident, int64_t ns)
198{
199    ssize_t index = rates.indexOfKey(ident);
200    if (index < 0) {
201        ALOGE("Info::setDelayForIdent(ident=%p, ns=%lld) failed (%s)",
202                ident, ns, strerror(-index));
203        return BAD_INDEX;
204    }
205    rates.editValueAt(index) = ns;
206    return NO_ERROR;
207}
208
209nsecs_t SensorDevice::Info::selectDelay()
210{
211    nsecs_t ns = rates.valueAt(0);
212    for (size_t i=1 ; i<rates.size() ; i++) {
213        nsecs_t cur = rates.valueAt(i);
214        if (cur < ns) {
215            ns = cur;
216        }
217    }
218    delay = ns;
219    return ns;
220}
221
222// ---------------------------------------------------------------------------
223}; // namespace android
224
225