JP Abgrall | 5dcc6c9 | 2012-05-31 20:39:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | #define LOG_TAG "Sensors" |
| 18 | |
| 19 | #include <fcntl.h> |
| 20 | #include <errno.h> |
| 21 | #include <math.h> |
| 22 | #include <poll.h> |
| 23 | #include <unistd.h> |
| 24 | #include <dirent.h> |
| 25 | #include <sys/select.h> |
| 26 | |
| 27 | #include <cutils/log.h> |
| 28 | |
| 29 | #include "SensorBase.h" |
| 30 | #include "iio/events.h" |
| 31 | |
| 32 | #define IIO_MAX_NAME_LENGTH 30 |
| 33 | |
| 34 | const char *iio_dir = "/sys/bus/iio/devices/"; |
| 35 | |
| 36 | /*****************************************************************************/ |
| 37 | |
| 38 | SensorBase::SensorBase( |
| 39 | const char* dev_name, |
| 40 | const char* data_name) |
| 41 | : mDevName(dev_name), mDataName(data_name), |
| 42 | mDevFd(-1), mDataFd(-1) |
| 43 | { |
JP Abgrall | db7bdef | 2012-06-21 15:04:34 -0700 | [diff] [blame] | 44 | ALOGV("%s(): dev_name=%s", __func__, dev_name); |
JP Abgrall | 5dcc6c9 | 2012-05-31 20:39:43 -0700 | [diff] [blame] | 45 | if (mDataName) { |
| 46 | mDataFd = openInput(mDataName); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | SensorBase::~SensorBase() { |
| 51 | if (mDataFd >= 0) { |
| 52 | close(mDataFd); |
| 53 | } |
| 54 | if (mDevFd >= 0) { |
| 55 | close(mDevFd); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | int SensorBase::openDevice() { |
| 60 | if ((mDevFd < 0) && mDevName) { |
| 61 | mDevFd = open(mDevName, O_RDONLY); |
| 62 | ALOGE_IF(mDevFd < 0, "Couldn't open %s (%s)", mDevName, strerror(errno)); |
| 63 | } |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | int SensorBase::closeDevice() { |
| 68 | if (mDevFd >= 0) { |
| 69 | close(mDevFd); |
| 70 | mDevFd = -1; |
| 71 | } |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | int SensorBase::getFd() const { |
| 76 | if (!mDataName) { |
| 77 | return mDevFd; |
| 78 | } |
| 79 | return mDataFd; |
| 80 | } |
| 81 | |
| 82 | int SensorBase::setDelay(int32_t handle, int64_t ns) { |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | bool SensorBase::hasPendingEvents() const { |
| 87 | return false; |
| 88 | } |
| 89 | |
| 90 | int64_t SensorBase::getTimestamp() { |
| 91 | struct timespec t; |
| 92 | t.tv_sec = t.tv_nsec = 0; |
| 93 | clock_gettime(CLOCK_MONOTONIC, &t); |
| 94 | return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * find_type_by_name() - function to match top level types by name |
| 99 | * @name: top level type instance name |
| 100 | * @type: the type of top level instance being sort |
| 101 | * |
| 102 | * Typical types this is used for are device and trigger. |
| 103 | * |
| 104 | * NOTE: This function is copied from drivers/staging/iio/Documentation/iio_utils.h |
| 105 | * and modified. |
| 106 | */ |
| 107 | int SensorBase::findTypeByName(const char *name, const char *type) |
| 108 | { |
| 109 | const struct dirent *ent; |
| 110 | int iio_id; |
| 111 | int ret = -ENODEV; |
| 112 | |
| 113 | FILE *nameFile; |
| 114 | DIR *dp; |
| 115 | char thisname[IIO_MAX_NAME_LENGTH]; |
| 116 | char filename[PATH_MAX]; |
| 117 | |
| 118 | dp = opendir(iio_dir); |
| 119 | if (dp == NULL) { |
| 120 | ALOGE("No industrialio devices available"); |
| 121 | return ret; |
| 122 | } |
| 123 | |
| 124 | while (ent = readdir(dp), ent != NULL) { |
| 125 | if (strcmp(ent->d_name, ".") != 0 && |
| 126 | strcmp(ent->d_name, "..") != 0 && |
| 127 | strlen(ent->d_name) > strlen(type) && |
| 128 | strncmp(ent->d_name, type, strlen(type)) == 0) { |
| 129 | if (sscanf(ent->d_name + strlen(type), "%d", &iio_id) != 1) |
| 130 | continue; |
| 131 | |
| 132 | sprintf(filename, "%s%s%d/name", iio_dir, type, iio_id); |
| 133 | nameFile = fopen(filename, "r"); |
| 134 | if (!nameFile) |
| 135 | continue; |
| 136 | |
| 137 | if (fscanf(nameFile, "%s", thisname) == 1) { |
| 138 | if (strcmp(name, thisname) == 0) { |
| 139 | fclose(nameFile); |
| 140 | ret = iio_id; |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | fclose(nameFile); |
| 145 | } |
| 146 | } |
| 147 | closedir(dp); |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | int SensorBase::openInput(const char* inputName) { |
| 152 | int event_fd = -1; |
| 153 | char devname[PATH_MAX]; |
| 154 | int dev_num; |
| 155 | |
| 156 | dev_num = findTypeByName(inputName, "iio:device"); |
| 157 | if (dev_num >= 0) { |
| 158 | int fd; |
| 159 | sprintf(devname, "/dev/iio:device%d", dev_num); |
| 160 | fd = open(devname, O_RDONLY); |
| 161 | if (fd >= 0) { |
| 162 | if (ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd) >= 0) |
| 163 | strcpy(mInputName, devname + 5); |
| 164 | else |
| 165 | ALOGE("couldn't get a event fd from %s", devname); |
| 166 | close(fd); /* close /dev/iio:device* */ |
| 167 | } else { |
| 168 | ALOGE("couldn't open %s (%s)", devname, strerror(errno)); |
| 169 | } |
| 170 | } else { |
| 171 | ALOGE("couldn't find the device %s", inputName); |
| 172 | } |
| 173 | |
| 174 | return event_fd; |
| 175 | } |