JP Abgrall | 5dcc6c9 | 2012-05-31 20:39:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | #define LOG_TAG "Sensors" |
| 18 | |
| 19 | #include <fcntl.h> |
| 20 | #include <errno.h> |
| 21 | #include <cutils/log.h> |
| 22 | #include <pthread.h> |
| 23 | |
| 24 | #include "IioSensorBase.h" |
| 25 | |
| 26 | char *IioSensorBase::makeSysfsName(const char *input_name, |
| 27 | const char *file_name) { |
| 28 | char *name; |
| 29 | int ret; |
| 30 | |
| 31 | ret = asprintf(&name, "/sys/bus/iio/devices/%s/%s", input_name, file_name); |
| 32 | if (ret < 0) |
| 33 | return NULL; |
| 34 | |
| 35 | return name; |
| 36 | } |
| 37 | |
| 38 | void IioSensorBase::handleData(int value) { |
| 39 | } |
| 40 | |
| 41 | IioSensorBase::IioSensorBase(const char *dev_name, |
| 42 | const char *data_name, |
| 43 | const char *enable_name, |
| 44 | const char *chan_name, |
| 45 | int iio_chan_type) |
| 46 | : SensorBase(dev_name, data_name), |
| 47 | mEnabled(true), |
| 48 | mHasPendingEvent(false), |
| 49 | mInputReader(MAX_BUFFER_FOR_EVENT), |
| 50 | mIioChanType(iio_chan_type), |
JP Abgrall | 3d96702 | 2012-10-22 12:42:18 -0700 | [diff] [blame] | 51 | mIioSysfsChanFp(NULL) |
JP Abgrall | 5dcc6c9 | 2012-05-31 20:39:43 -0700 | [diff] [blame] | 52 | { |
JP Abgrall | 3d96702 | 2012-10-22 12:42:18 -0700 | [diff] [blame] | 53 | pthread_mutex_init(&mLock, NULL); |
JP Abgrall | db7bdef | 2012-06-21 15:04:34 -0700 | [diff] [blame] | 54 | ALOGV("%s(): dev_name=%s", __func__, dev_name); |
JP Abgrall | 5dcc6c9 | 2012-05-31 20:39:43 -0700 | [diff] [blame] | 55 | mPendingEvent.version = sizeof(sensors_event_t); |
| 56 | memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data)); |
| 57 | if (!mDataFd) |
| 58 | return; |
| 59 | |
| 60 | mInputSysfsEnable = makeSysfsName(mInputName, enable_name); |
| 61 | if (!mInputSysfsEnable) { |
| 62 | ALOGE("%s: unable to allocate mem for %s:%s", __func__, |
| 63 | data_name, enable_name); |
| 64 | return; |
| 65 | } |
| 66 | mInputSysfsSamplingFrequency = makeSysfsName(mInputName, "sampling_frequency"); |
| 67 | if (!mInputSysfsSamplingFrequency) { |
| 68 | ALOGE("%s: unable to allocate mem for %s:poll_delay", __func__, |
| 69 | data_name); |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | mIioSysfsChan = makeSysfsName(mInputName, chan_name); |
| 74 | if (!mIioSysfsChan) { |
| 75 | ALOGE("%s: unable to allocate mem for %s:%s", __func__, data_name, |
| 76 | chan_name); |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | mIioSysfsChanFp = fopen(mIioSysfsChan, "r"); |
| 81 | if (mIioSysfsChanFp == NULL) { |
| 82 | ALOGE("%s: unable to open %s", __func__, mIioSysfsChan); |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | int flags = fcntl(mDataFd, F_GETFL, 0); |
| 87 | fcntl(mDataFd, F_SETFL, flags | O_NONBLOCK); |
| 88 | |
| 89 | enable(0, 0); |
| 90 | } |
| 91 | |
| 92 | IioSensorBase::~IioSensorBase() { |
| 93 | if (mEnabled) { |
| 94 | enable(0, 0); |
| 95 | } |
| 96 | if (mIioSysfsChanFp != NULL) { |
| 97 | fclose(mIioSysfsChanFp); |
| 98 | } |
| 99 | free(mInputSysfsEnable); |
| 100 | free(mInputSysfsSamplingFrequency); |
| 101 | free(mIioSysfsChan); |
| 102 | } |
| 103 | |
| 104 | bool IioSensorBase::readValue(int *value) { |
| 105 | |
| 106 | bool ret = true; |
| 107 | |
| 108 | if (mIioSysfsChanFp == NULL) |
| 109 | return false; |
| 110 | |
| 111 | if (fscanf(mIioSysfsChanFp, "%d\n", value) != 1) |
| 112 | ret = false; |
| 113 | |
| 114 | fseek(mIioSysfsChanFp, 0, SEEK_SET); |
| 115 | |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | int IioSensorBase::enable(int32_t handle, int en) |
| 120 | { |
| 121 | int err = 0; |
| 122 | |
| 123 | ALOGI("%s: %s %d", __func__, mDevName, en); |
| 124 | |
| 125 | pthread_mutex_lock(&mLock); |
| 126 | if (en != mEnabled) { |
| 127 | int fd; |
| 128 | fd = open(mInputSysfsEnable, O_RDWR); |
| 129 | if (fd >= 0) { |
| 130 | err = write(fd, en ? "1" : "0", 2); |
| 131 | close(fd); |
| 132 | if (err < 0) { |
| 133 | goto cleanup; |
| 134 | } |
| 135 | mEnabled = en; |
| 136 | err = 0; |
| 137 | } else { |
| 138 | err = -1; |
| 139 | } |
| 140 | } |
| 141 | cleanup: |
| 142 | pthread_mutex_unlock(&mLock); |
| 143 | return err; |
| 144 | } |
| 145 | |
| 146 | int IioSensorBase::setDelay(int32_t handle, int64_t ns) |
| 147 | { |
| 148 | int fd; |
| 149 | int result = 0; |
| 150 | char buf[21]; /* 21 = log10(max long long int) + 1 for sign + '\0' */ |
| 151 | pthread_mutex_lock(&mLock); |
| 152 | if (!ns) { |
| 153 | result = -1; |
| 154 | goto done; |
| 155 | } |
| 156 | fd = open(mInputSysfsSamplingFrequency, O_RDWR); |
| 157 | if (fd < 0) { |
| 158 | result = -1; |
| 159 | goto done; |
| 160 | } |
| 161 | /* round up ((NSEC_PER_SEC - 1) + ns) / ns */ |
| 162 | sprintf(buf, "%lld", ((1000000000 - 1) + ns) / ns); |
| 163 | write(fd, buf, strlen(buf)+1); |
| 164 | close(fd); |
| 165 | done: |
| 166 | pthread_mutex_unlock(&mLock); |
| 167 | return result; |
| 168 | } |
| 169 | |
| 170 | int IioSensorBase::readEvents(sensors_event_t* data, int count) |
| 171 | { |
| 172 | if (count < 1) |
| 173 | return -EINVAL; |
| 174 | |
| 175 | pthread_mutex_lock(&mLock); |
| 176 | int numEventReceived = 0; |
| 177 | |
| 178 | if (mHasPendingEvent) { |
| 179 | mHasPendingEvent = false; |
| 180 | if (mEnabled) { |
| 181 | mPendingEvent.timestamp = getTimestamp(); |
| 182 | *data = mPendingEvent; |
| 183 | numEventReceived++; |
| 184 | } |
| 185 | goto done; |
| 186 | } |
| 187 | |
| 188 | iio_event_data const* event; |
| 189 | |
| 190 | while (count && mInputReader.readEvent(mDataFd, &event)) { |
| 191 | int value; |
| 192 | if (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id) == mIioChanType) { |
| 193 | if (mEnabled && readValue(&value)) { |
| 194 | handleData(value); |
| 195 | mPendingEvent.timestamp = event->timestamp; |
| 196 | *data++ = mPendingEvent; |
| 197 | count--; |
| 198 | numEventReceived++; |
| 199 | } |
| 200 | } |
| 201 | mInputReader.next(); |
| 202 | } |
| 203 | |
| 204 | done: |
| 205 | pthread_mutex_unlock(&mLock); |
| 206 | return numEventReceived; |
| 207 | } |