kbdsensor.cpp

   1 /**
   2  *
   3  * Atkbd style sensor
   4  *
   5  * Copyright (C) 2011 The Android-x86 Open Source Project
   6  *
   7  * by Chih-Wei Huang <cwhuang@linux.org.tw>
   8  *
   9  * Licensed under GPLv2 or later
  10  *
  11  **/
  12
  13 #define LOG_TAG "KbdSensor"
  14
  15 #include <cmath>
  16 #include <cerrno>
  17 #include <cstring>
  18 #include <sys/stat.h>
  19 #include <poll.h>
  20 #include <fcntl.h>
  21 #include <dirent.h>
  22 #include <cutils/log.h>
  23 #include <linux/input.h>
  24 #include <linux/uinput.h>
  25 #include <hardware/sensors.h>
  26
  27 const int ID_ACCELERATION = (SENSORS_HANDLE_BASE + 0);
  28
  29 template <typename T> struct SensorFd : T {
  30         int ufd;
  31
  32         SensorFd(const struct hw_module_t *module, struct hw_device_t **device);
  33         ~SensorFd();
  34 };
  35
  36 template <typename T> SensorFd<T>::SensorFd(const struct hw_module_t *module, struct hw_device_t **device) : ufd(-1)
  37 {
  38         this->common.tag     = HARDWARE_DEVICE_TAG;
  39         this->common.version = 0;
  40         this->common.module  = const_cast<struct hw_module_t *>(module);
  41         *device              = &this->common;
  42         LOGD("%s: module=%p dev=%p", __FUNCTION__, module, *device);
  43 }
  44
  45 template <typename T> SensorFd<T>::~SensorFd()
  46 {
  47         close(ufd);
  48 }
  49
  50 struct SensorPollContext : SensorFd<sensors_poll_device_t> {
  51   public:
  52         SensorPollContext(const struct hw_module_t *module, struct hw_device_t **device);
  53         ~SensorPollContext();
  54
  55   private:
  56         static int poll_close(struct hw_device_t *dev);
  57         static int poll_activate(struct sensors_poll_device_t *dev, int handle, int enabled);
  58         static int poll_setDelay(struct sensors_poll_device_t *dev, int handle, int64_t ns);
  59         static int poll_poll(struct sensors_poll_device_t *dev, sensors_event_t *data, int count);
  60
  61         enum {
  62                 ROT_0,
  63                 ROT_90,
  64                 ROT_180,
  65                 ROT_270
  66         };
  67
  68         bool enabled;
  69         int rotation;
  70         struct timespec delay;
  71         struct pollfd pfd;
  72         sensors_event_t orients[4];
  73 };
  74
  75 SensorPollContext::SensorPollContext(const struct hw_module_t *module, struct hw_device_t **device)
  76       : SensorFd<sensors_poll_device_t>(module, device), enabled(false), rotation(ROT_0)
  77 {
  78         common.close = poll_close;
  79         activate     = poll_activate;
  80         setDelay     = poll_setDelay;
  81         poll         = poll_poll;
  82
  83         int &fd = pfd.fd;
  84         const char *dirname = "/dev/input";
  85         if (DIR *dir = opendir(dirname)) {
  86                 while (struct dirent *de = readdir(dir)) {
  87                         if (de->d_name[0] != 'e') // eventX
  88                                 continue;
  89                         char name[PATH_MAX];
  90                         snprintf(name, PATH_MAX, "%s/%s", dirname, de->d_name);
  91                         fd = open(name, O_RDWR);
  92                         if (fd < 0) {
  93                                 LOGE("could not open %s, %s", name, strerror(errno));
  94                                 continue;
  95                         }
  96                         name[sizeof(name) - 1] = '\0';
  97                         if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
  98                                 LOGE("could not get device name for %s, %s\n", name, strerror(errno));
  99                                 name[0] = '\0';
 100                         }
 101
 102                         // TODO: parse /etc/excluded-input-devices.xml
 103                         if (!strcmp(name, "AT Translated Set 2 keyboard")) {
 104                                 LOGI("open %s ok", name);
 105                                 break;
 106                         }
 107                         close(fd);
 108                 }
 109                 closedir(dir);
 110         }
 111
 112         ufd = open("/dev/uinput", O_WRONLY | O_NDELAY);
 113         if (ufd >= 0) {
 114                 struct uinput_user_dev ud;
 115                 memset(&ud, 0, sizeof(ud));
 116                 strcpy(ud.name, "Tega V2 Buttons");
 117                 write(ufd, &ud, sizeof(ud));
 118                 ioctl(ufd, UI_SET_EVBIT, EV_KEY);
 119                 ioctl(ufd, UI_SET_EVBIT, EV_REP);
 120                 ioctl(ufd, UI_SET_KEYBIT, KEY_ESC);
 121                 ioctl(ufd, UI_SET_KEYBIT, KEY_COMPOSE);
 122                 ioctl(ufd, UI_SET_KEYBIT, KEY_LEFTMETA);
 123                 ioctl(ufd, UI_DEV_CREATE, 0);
 124         } else {
 125                 LOGE("could not open uinput device: %s", strerror(errno));
 126         }
 127
 128         pfd.events = POLLIN;
 129         orients[ROT_0].version = sizeof(sensors_event_t);
 130         orients[ROT_0].sensor = ID_ACCELERATION;
 131         orients[ROT_0].type = SENSOR_TYPE_ACCELEROMETER;
 132         orients[ROT_0].acceleration.status = SENSOR_STATUS_ACCURACY_HIGH;
 133         orients[ROT_270] = orients[ROT_180] = orients[ROT_90] = orients[ROT_0];
 134         const double angle = 20.0;
 135         const double cos_angle = GRAVITY_EARTH * cos(angle / M_PI);
 136         const double sin_angle = GRAVITY_EARTH * sin(angle / M_PI);
 137         orients[ROT_0].acceleration.x   = 0.0;
 138         orients[ROT_0].acceleration.y   = cos_angle;
 139         orients[ROT_0].acceleration.z   = sin_angle;
 140         orients[ROT_90].acceleration.x  = cos_angle;
 141         orients[ROT_90].acceleration.y  = 0.0;
 142         orients[ROT_90].acceleration.z  = sin_angle;
 143         orients[ROT_180].acceleration.x = 0.0;
 144         orients[ROT_180].acceleration.y = -cos_angle;
 145         orients[ROT_180].acceleration.z = -sin_angle;
 146         orients[ROT_270].acceleration.x = -cos_angle;
 147         orients[ROT_270].acceleration.y = 0.0;
 148         orients[ROT_270].acceleration.z = -sin_angle;
 149
 150         delay.tv_sec = 0;
 151         delay.tv_nsec = 300000000L;
 152
 153         LOGD("%s: dev=%p ufd=%d fd=%d", __FUNCTION__, this, ufd, fd);
 154 }
 155
 156 SensorPollContext::~SensorPollContext()
 157 {
 158         close(pfd.fd);
 159 }
 160
 161 int SensorPollContext::poll_close(struct hw_device_t *dev)
 162 {
 163         LOGD("%s: dev=%p", __FUNCTION__, dev);
 164         delete reinterpret_cast<SensorPollContext *>(dev);
 165         return 0;
 166 }
 167 int SensorPollContext::poll_activate(struct sensors_poll_device_t *dev, int handle, int enabled)
 168 {
 169         LOGD("%s: dev=%p handle=%d enabled=%d", __FUNCTION__, dev, handle, enabled);
 170         SensorPollContext *ctx = reinterpret_cast<SensorPollContext *>(dev);
 171         ctx->enabled = enabled;
 172         return 0;
 173 }
 174 int SensorPollContext::poll_setDelay(struct sensors_poll_device_t *dev, int handle, int64_t ns)
 175 {
 176         LOGD("%s: dev=%p delay-ns=%lld", __FUNCTION__, dev, ns);
 177         return 0;
 178 }
 179 int SensorPollContext::poll_poll(struct sensors_poll_device_t *dev, sensors_event_t *data, int count)
 180 {
 181         LOGD("%s: dev=%p data=%p count=%d", __FUNCTION__, dev, data, count);
 182         SensorPollContext *ctx = reinterpret_cast<SensorPollContext *>(dev);
 183
 184         struct pollfd &pfd = ctx->pfd;
 185         while (int pollres = ::poll(&pfd, 1, -1)) {
 186                 if (pollres < 0) {
 187                         LOGE("%s: poll %d error: %s", __FUNCTION__, pfd.fd, strerror(errno));
 188                         break;
 189                 }
 190                 if (!(pfd.revents & POLLIN)) {
 191                         LOGW("%s: ignore revents %d", __FUNCTION__, pfd.revents);
 192                         continue;
 193                 }
 194
 195                 struct input_event iev;
 196                 size_t res = ::read(pfd.fd, &iev, sizeof(iev));
 197                 if (res < sizeof(iev)) {
 198                         LOGW("insufficient input data(%d)? fd=%d", res, pfd.fd);
 199                         continue;
 200                 }
 201                 LOGD("type=%d scancode=%d value=%d from fd=%d", iev.type, iev.code, iev.value, pfd.fd);
 202                 if (iev.type == EV_KEY) {
 203                         int rot = -1;
 204                         switch (iev.code)
 205                         {
 206                                 case KEY_LEFTCTRL:
 207                                 case KEY_LEFTALT:
 208                                         if (iev.value)
 209                                                 continue;
 210                                         rot = ctx->rotation;
 211                                         break;
 212                                 case FN_ROT_0:
 213                                         rot = ROT_0;
 214                                         break;
 215                                 case FN_ROT_90:
 216                                         rot = ROT_90;
 217                                         break;
 218                                 case FN_ROT_180:
 219                                         rot = ROT_180;
 220                                         break;
 221                                 case FN_ROT_270:
 222                                         rot = ROT_270;
 223                                         break;
 224 #if 0
 225                                 case KEY_ESC:
 226                                         iev.code = KEY_LEFTMETA;
 227                                         break;
 228                                 case KEY_COMPOSE:
 229                                         iev.code = KEY_ESC;
 230                                         break;
 231 #endif
 232                         }
 233                         if (rot >= 0) {
 234                                 if (rot != ctx->rotation) {
 235                                         LOGI("orientation changed from %d to %d", ctx->rotation * 90, rot * 90);
 236                                         ctx->rotation = rot;
 237                                 }
 238                                 if (ctx->enabled && count > 0)
 239                                         break;
 240                         }
 241                 }
 242
 243                 if (ctx->ufd >= 0)
 244                         write(ctx->ufd, &iev, sizeof(iev));
 245         }
 246
 247         LOGD("%s: dev=%p ufd=%d fd=%d rotation=%d", __FUNCTION__, dev, ctx->ufd, pfd.fd, ctx->rotation * 90);
 248         nanosleep(&ctx->delay, 0);
 249         data[0] = ctx->orients[ctx->rotation];
 250         data[0].timestamp = time(0) * 1000000000L;
 251         return 1;
 252 }
 253
 254 static int open_kbd_sensor(const struct hw_module_t *module, const char *id, struct hw_device_t **device)
 255 {
 256         LOGD("%s: id=%s", __FUNCTION__, id);
 257         return new SensorPollContext(module, device) ? 0 : -EINVAL;
 258 }
 259
 260 static struct sensor_t sSensorListInit[] = {
 261         {
 262                 name: "Kbd Orientation Sensor",
 263                 vendor: "Android-x86 Open Source Project",
 264                 version: 1,
 265                 handle: ID_ACCELERATION,
 266                 type: SENSOR_TYPE_ACCELEROMETER,
 267                 maxRange: 2.8f,
 268                 resolution: 1.0f/4032.0f,
 269                 power: 3.0f,
 270                 minDelay: 0,
 271                 reserved: { }
 272         }
 273 };
 274
 275 static int sensors_get_sensors_list(struct sensors_module_t *module, struct sensor_t const **list)
 276 {
 277         *list = sSensorListInit;
 278         return sizeof(sSensorListInit) / sizeof(struct sensor_t);
 279 }
 280
 281 static struct hw_module_methods_t sensors_methods = {
 282         open: open_kbd_sensor
 283 };
 284
 285 struct sensors_module_t HAL_MODULE_INFO_SYM = {
 286         common: {
 287                 tag: HARDWARE_MODULE_TAG,
 288                 version_major: 2,
 289                 version_minor: 3,
 290                 id: SENSORS_HARDWARE_MODULE_ID,
 291                 name: "Kbd Orientation Sensor",
 292                 author: "Chih-Wei Huang",
 293                 methods: &sensors_methods,
 294                 dso: 0,
 295                 reserved: { }
 296         },
 297         get_sensors_list: sensors_get_sensors_list
 298 };