enumeration.c

   1 /*
   2  * Copyright (C) 2014 Intel Corporation.
   3  */
   4
   5 #include <ctype.h>
   6 #include <dirent.h>
   7 #include <stdlib.h>
   8 #include <utils/Log.h>
   9 #include <hardware/sensors.h>
  10 #include "enumeration.h"
  11 #include "description.h"
  12 #include "utils.h"
  13 #include "transform.h"
  14 #include "description.h"
  15 #include "control.h"
  16 #include "calibration.h"
  17
  18 /*
  19  * This table maps syfs entries in scan_elements directories to sensor types,
  20  * and will also be used to determine other sysfs names as well as the iio
  21  * device number associated to a specific sensor.
  22  */
  23
  24  /*
  25   * We duplicate entries for the uncalibrated types after their respective base
  26   * sensor. This is because all sensor entries must have an associated catalog entry
  27   * and also because when only the uncal sensor is active it needs to take it's data
  28   * from the same iio device as the base one.
  29   */
  30
  31 struct sensor_catalog_entry_t sensor_catalog[] = {
  32         DECLARE_SENSOR3("accel",      SENSOR_TYPE_ACCELEROMETER,  "x", "y", "z")
  33         DECLARE_SENSOR3("anglvel",    SENSOR_TYPE_GYROSCOPE,      "x", "y", "z")
  34         DECLARE_SENSOR3("magn",       SENSOR_TYPE_MAGNETIC_FIELD, "x", "y", "z")
  35         DECLARE_SENSOR1("intensity",  SENSOR_TYPE_LIGHT,          "both"       )
  36         DECLARE_SENSOR0("illuminance",SENSOR_TYPE_LIGHT                        )
  37         DECLARE_SENSOR3("incli",      SENSOR_TYPE_ORIENTATION,    "x", "y", "z")
  38         DECLARE_SENSOR4("rot",        SENSOR_TYPE_ROTATION_VECTOR,
  39                                          "quat_x", "quat_y", "quat_z", "quat_w")
  40         DECLARE_SENSOR0("temp",       SENSOR_TYPE_AMBIENT_TEMPERATURE          )
  41         DECLARE_SENSOR0("proximity",  SENSOR_TYPE_PROXIMITY                    )
  42         DECLARE_SENSOR3("anglvel",      SENSOR_TYPE_GYROSCOPE_UNCALIBRATED, "x", "y", "z")
  43 };
  44
  45 #define CATALOG_SIZE    ARRAY_SIZE(sensor_catalog)
  46
  47 /* ACPI PLD (physical location of device) definitions, as used with sensors */
  48
  49 #define PANEL_FRONT     4
  50 #define PANEL_BACK      5
  51
  52 /* We equate sensor handles to indices in these tables */
  53
  54 struct sensor_t      sensor_desc[MAX_SENSORS];  /* Android-level descriptors */
  55 struct sensor_info_t sensor_info[MAX_SENSORS];  /* Internal descriptors      */
  56 int sensor_count;                               /* Detected sensors          */
  57
  58
  59 static void setup_properties_from_pld(int s, int panel, int rotation,
  60                                       int num_channels)
  61 {
  62         /*
  63          * Generate suitable order and opt_scale directives from the PLD panel
  64          * and rotation codes we got. This can later be superseded by the usual
  65          * properties if necessary. Eventually we'll need to replace these
  66          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
  67          */
  68
  69         int x = 1;
  70         int y = 1;
  71         int z = 1;
  72         int xy_swap = 0;
  73         int angle = rotation * 45;
  74
  75         /* Only deal with 3 axis chips for now */
  76         if (num_channels < 3)
  77                 return;
  78
  79         if (panel == PANEL_BACK) {
  80                 /* Chip placed on the back panel ; negate x and z */
  81                 x = -x;
  82                 z = -z;
  83         }
  84
  85         switch (angle) {
  86                 case 90: /* 90° clockwise: negate y then swap x,y */
  87                         xy_swap = 1;
  88                         y = -y;
  89                         break;
  90
  91                 case 180: /* Upside down: negate x and y */
  92                         x = -x;
  93                         y = -y;
  94                         break;
  95
  96                 case 270: /* 90° counter clockwise: negate x then swap x,y */
  97                         x = -x;
  98                         xy_swap = 1;
  99                         break;
 100         }
 101
 102         if (xy_swap) {
 103                 sensor_info[s].order[0] = 1;
 104                 sensor_info[s].order[1] = 0;
 105                 sensor_info[s].order[2] = 2;
 106                 sensor_info[s].quirks |= QUIRK_FIELD_ORDERING;
 107         }
 108
 109         sensor_info[s].channel[0].opt_scale = x;
 110         sensor_info[s].channel[1].opt_scale = y;
 111         sensor_info[s].channel[2].opt_scale = z;
 112 }
 113
 114
 115 static int is_valid_pld (int panel, int rotation)
 116 {
 117         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 118                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 119                 return 0;
 120         }
 121
 122         /* Only deal with 90° rotations for now */
 123         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 124                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 125                 return 0;
 126         }
 127
 128         return 1;
 129 }
 130
 131
 132 static int read_pld_from_properties (int s, int* panel, int* rotation)
 133 {
 134         int p, r;
 135
 136         if (sensor_get_prop(s, "panel", &p))
 137                 return -1;
 138
 139         if (sensor_get_prop(s, "rotation", &r))
 140                 return -1;
 141
 142         if (!is_valid_pld(p, r))
 143                 return -1;
 144
 145         *panel = p;
 146         *rotation = r;
 147
 148         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 149
 150         return 0;
 151 }
 152
 153
 154 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 155 {
 156         char sysfs_path[PATH_MAX];
 157         int p,r;
 158
 159         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 160
 161         if (sysfs_read_int(sysfs_path, &p))
 162                 return -1;
 163
 164         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 165
 166         if (sysfs_read_int(sysfs_path, &r))
 167                 return -1;
 168
 169         if (!is_valid_pld(p, r))
 170                 return -1;
 171
 172         *panel = p;
 173         *rotation = r;
 174
 175         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 176
 177         return 0;
 178 }
 179
 180
 181 static void decode_placement_information (int dev_num, int num_channels, int s)
 182 {
 183         /*
 184          * See if we have optional "physical location of device" ACPI tags.
 185          * We're only interested in panel and rotation specifiers. Use the
 186          * .panel and .rotation properties in priority, and the actual ACPI
 187          * values as a second source.
 188          */
 189
 190         int panel;
 191         int rotation;
 192
 193         if (read_pld_from_properties(s, &panel, &rotation) &&
 194                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 195                         return; /* No PLD data available */
 196
 197         /* Map that to field ordering and scaling mechanisms */
 198         setup_properties_from_pld(s, panel, rotation, num_channels);
 199 }
 200
 201
 202 static void add_sensor (int dev_num, int catalog_index, int use_polling)
 203 {
 204         int s;
 205         int sensor_type;
 206         int retval;
 207         char sysfs_path[PATH_MAX];
 208         const char* prefix;
 209         float scale;
 210         int c;
 211         float opt_scale;
 212         const char* ch_name;
 213         int num_channels;
 214         char suffix[MAX_NAME_SIZE + 8];
 215
 216         if (sensor_count == MAX_SENSORS) {
 217                 ALOGE("Too many sensors!\n");
 218                 return;
 219         }
 220
 221         sensor_type = sensor_catalog[catalog_index].type;
 222
 223         /*
 224          * At this point we could check that the expected sysfs attributes are
 225          * present ; that would enable having multiple catalog entries with the
 226          * same sensor type, accomodating different sets of sysfs attributes.
 227          */
 228
 229         s = sensor_count;
 230
 231         sensor_info[s].dev_num          = dev_num;
 232         sensor_info[s].catalog_index    = catalog_index;
 233         sensor_info[s].type             = sensor_type;
 234
 235         num_channels = sensor_catalog[catalog_index].num_channels;
 236
 237         if (use_polling)
 238                 sensor_info[s].num_channels = 0;
 239         else
 240                 sensor_info[s].num_channels = num_channels;
 241
 242         prefix = sensor_catalog[catalog_index].tag;
 243
 244         /*
 245          * receiving the illumination sensor calibration inputs from
 246          * the Android properties and setting it within sysfs
 247          */
 248         if (sensor_type == SENSOR_TYPE_LIGHT) {
 249                 retval = sensor_get_illumincalib(s);
 250                 if (retval > 0) {
 251                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 252                         sysfs_write_int(sysfs_path, retval);
 253                 }
 254         }
 255
 256         /* Read name attribute, if available */
 257         sprintf(sysfs_path, NAME_PATH, dev_num);
 258         sysfs_read_str(sysfs_path, sensor_info[s].internal_name, MAX_NAME_SIZE);
 259
 260         /* See if we have general offsets and scale values for this sensor */
 261
 262         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 263         sysfs_read_float(sysfs_path, &sensor_info[s].offset);
 264
 265         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 266         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 267                 /*
 268                  * There is a chip preferred scale specified,
 269                  * so try to store it in sensor's scale file
 270                  */
 271                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 272                         ALOGE("Failed to store scale[%f] into %s - file is missing", scale, sysfs_path);
 273                         /* Store failed, try to store the scale into channel specific file */
 274                         for (c = 0; c < num_channels; c++)
 275                         {
 276                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 277                                         sensor_catalog[catalog_index].channel[c].scale_path);
 278                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 279                                         ALOGE("Failed to store scale[%f] into %s", scale, sysfs_path);
 280                         }
 281                 }
 282         }
 283
 284         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 285         if (!sysfs_read_float(sysfs_path, &scale)) {
 286                 sensor_info[s].scale = scale;
 287                 ALOGI("Scale path:%s scale:%f dev_num:%d\n",
 288                                         sysfs_path, scale, dev_num);
 289         } else {
 290                 sensor_info[s].scale = 1;
 291
 292                 /* Read channel specific scale if any*/
 293                 for (c = 0; c < num_channels; c++)
 294                 {
 295                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 296                            sensor_catalog[catalog_index].channel[c].scale_path);
 297
 298                         if (!sysfs_read_float(sysfs_path, &scale)) {
 299                                 sensor_info[s].channel[c].scale = scale;
 300                                 sensor_info[s].scale = 0;
 301
 302                                 ALOGI(  "Scale path:%s "
 303                                         "channel scale:%f dev_num:%d\n",
 304                                         sysfs_path, scale, dev_num);
 305                         }
 306                 }
 307         }
 308
 309         /* Set default scaling - if num_channels is zero, we have one channel */
 310
 311         sensor_info[s].channel[0].opt_scale = 1;
 312
 313         for (c = 1; c < num_channels; c++)
 314                 sensor_info[s].channel[c].opt_scale = 1;
 315
 316         /* Read ACPI _PLD attributes for this sensor, if there are any */
 317         decode_placement_information(dev_num, num_channels, s);
 318
 319         /*
 320          * See if we have optional correction scaling factors for each of the
 321          * channels of this sensor. These would be expressed using properties
 322          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 323          * support things such as iio.temp.opt_scale = -1. Note that this works
 324          * for all types of sensors, and whatever transform is selected, on top
 325          * of any previous conversions.
 326          */
 327
 328         if (num_channels) {
 329                 for (c = 0; c < num_channels; c++) {
 330                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 331                         sprintf(suffix, "%s.opt_scale", ch_name);
 332                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 333                                 sensor_info[s].channel[c].opt_scale = opt_scale;
 334                 }
 335         } else
 336                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 337                         sensor_info[s].channel[0].opt_scale = opt_scale;
 338
 339         /* Initialize Android-visible descriptor */
 340         sensor_desc[s].name             = sensor_get_name(s);
 341         sensor_desc[s].vendor           = sensor_get_vendor(s);
 342         sensor_desc[s].version          = sensor_get_version(s);
 343         sensor_desc[s].handle           = s;
 344         sensor_desc[s].type             = sensor_type;
 345         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 346         sensor_desc[s].resolution       = sensor_get_resolution(s);
 347         sensor_desc[s].power            = sensor_get_power(s);
 348         sensor_desc[s].stringType = sensor_get_string_type(s);
 349
 350         /* None of our supported sensors requires a special permission.
 351         *  If this will be the case we should implement a sensor_get_perm
 352         */
 353         sensor_desc[s].requiredPermission = "";
 354         sensor_desc[s].flags = sensor_get_flags(s);
 355         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 356         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 357         ALOGI("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 358                 s, sensor_info[s].friendly_name, sensor_desc[s].type,
 359                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay, sensor_desc[s].flags);
 360
 361         /* We currently do not implement batching when we'll so
 362          * these should be overriden appropriately
 363          */
 364         sensor_desc[s].fifoReservedEventCount = 0;
 365         sensor_desc[s].fifoMaxEventCount = 0;
 366
 367         if (sensor_info[s].internal_name[0] == '\0') {
 368                 /*
 369                  * In case the kernel-mode driver doesn't expose a name for
 370                  * the iio device, use (null)-dev%d as the trigger name...
 371                  * This can be considered a kernel-mode iio driver bug.
 372                  */
 373                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 374                 strcpy(sensor_info[s].internal_name, "(null)");
 375         }
 376
 377         if (sensor_type == SENSOR_TYPE_GYROSCOPE ||
 378                 sensor_type == SENSOR_TYPE_GYROSCOPE_UNCALIBRATED) {
 379                 struct gyro_cal* calibration_data = calloc(1, sizeof(struct gyro_cal));
 380                 sensor_info[s].cal_data = calibration_data;
 381         }
 382
 383         if (sensor_type == SENSOR_TYPE_MAGNETIC_FIELD) {
 384                 struct compass_cal* calibration_data = calloc(1, sizeof(struct compass_cal));
 385                 sensor_info[s].cal_data = calibration_data;
 386         }
 387         sensor_info[s].max_cal_level = sensor_get_cal_steps(s);
 388         /* Select one of the available sensor sample processing styles */
 389         select_transform(s);
 390
 391         /* Initialize fields related to sysfs reads offloading */
 392         sensor_info[s].thread_data_fd[0]  = -1;
 393         sensor_info[s].thread_data_fd[1]  = -1;
 394         sensor_info[s].acquisition_thread = -1;
 395
 396         /* Check if we have a special ordering property on this sensor */
 397         if (sensor_get_order(s, sensor_info[s].order))
 398                 sensor_info[s].quirks |= QUIRK_FIELD_ORDERING;
 399
 400         sensor_count++;
 401 }
 402
 403
 404 static void discover_poll_sensors (int dev_num, char map[CATALOG_SIZE])
 405 {
 406         char base_dir[PATH_MAX];
 407         DIR *dir;
 408         struct dirent *d;
 409         unsigned int i;
 410         int c;
 411
 412         memset(map, 0, CATALOG_SIZE);
 413
 414         snprintf(base_dir, sizeof(base_dir), BASE_PATH, dev_num);
 415
 416         dir = opendir(base_dir);
 417         if (!dir) {
 418                 return;
 419         }
 420
 421         /* Enumerate entries in this iio device's base folder */
 422
 423         while ((d = readdir(dir))) {
 424                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 425                         continue;
 426
 427                 /* If the name matches a catalog entry, flag it */
 428                 for (i = 0; i<CATALOG_SIZE; i++) {
 429                 /* This will be added separately later */
 430                 if (sensor_catalog[i].type == SENSOR_TYPE_GYROSCOPE_UNCALIBRATED)
 431                         continue;
 432                 for (c=0; c<sensor_catalog[i].num_channels; c++)
 433                         if (!strcmp(d->d_name,sensor_catalog[i].channel[c].raw_path) ||
 434                                 !strcmp(d->d_name, sensor_catalog[i].channel[c].input_path)) {
 435                                         map[i] = 1;
 436                                         break;
 437                         }
 438                 }
 439         }
 440
 441         closedir(dir);
 442 }
 443
 444
 445 static void discover_trig_sensors (int dev_num, char map[CATALOG_SIZE])
 446 {
 447         char scan_elem_dir[PATH_MAX];
 448         DIR *dir;
 449         struct dirent *d;
 450         unsigned int i;
 451
 452         memset(map, 0, CATALOG_SIZE);
 453
 454         /* Enumerate entries in this iio device's scan_elements folder */
 455
 456         snprintf(scan_elem_dir, sizeof(scan_elem_dir), CHANNEL_PATH, dev_num);
 457
 458         dir = opendir(scan_elem_dir);
 459         if (!dir) {
 460                 return;
 461         }
 462
 463         while ((d = readdir(dir))) {
 464                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 465                         continue;
 466
 467                 /* Compare en entry to known ones and create matching sensors */
 468
 469                 for (i = 0; i<CATALOG_SIZE; i++) {
 470                         if (sensor_catalog[i].type == SENSOR_TYPE_GYROSCOPE_UNCALIBRATED)
 471                                 continue;
 472                         if (!strcmp(d->d_name,
 473                                         sensor_catalog[i].channel[0].en_path)) {
 474                                         map[i] = 1;
 475                                         break;
 476                         }
 477                 }
 478         }
 479
 480         closedir(dir);
 481 }
 482
 483
 484 static void orientation_sensor_check(void)
 485 {
 486         /*
 487          * If we have accel + gyro + magn but no rotation vector sensor,
 488          * SensorService replaces the HAL provided orientation sensor by the
 489          * AOSP version... provided we report one. So initialize a virtual
 490          * orientation sensor with zero values, which will get replaced. See:
 491          * frameworks/native/services/sensorservice/SensorService.cpp, looking
 492          * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 493          * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 494          */
 495
 496         int i;
 497         int has_acc = 0;
 498         int has_gyr = 0;
 499         int has_mag = 0;
 500         int has_rot = 0;
 501         int has_ori = 0;
 502         int catalog_size = CATALOG_SIZE;
 503
 504         for (i=0; i<sensor_count; i++)
 505                 switch (sensor_info[i].type) {
 506                         case SENSOR_TYPE_ACCELEROMETER:
 507                                 has_acc = 1;
 508                                 break;
 509                         case SENSOR_TYPE_GYROSCOPE:
 510                                 has_gyr = 1;
 511                                 break;
 512                         case SENSOR_TYPE_MAGNETIC_FIELD:
 513                                 has_mag = 1;
 514                                 break;
 515                         case SENSOR_TYPE_ORIENTATION:
 516                                 has_ori = 1;
 517                                 break;
 518                         case SENSOR_TYPE_ROTATION_VECTOR:
 519                                 has_rot = 1;
 520                                 break;
 521                 }
 522
 523         if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 524                 for (i=0; i<catalog_size; i++)
 525                         if (sensor_catalog[i].type == SENSOR_TYPE_ORIENTATION) {
 526                                 ALOGI("Adding placeholder orientation sensor");
 527                                 add_sensor(0, i, 1);
 528                                 break;
 529                         }
 530 }
 531
 532 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 533                                  int sensor_name_len)
 534 {
 535         /*
 536          * A new trigger has been enumerated for this sensor. Check if it makes
 537          * sense to use it over the currently selected one, and select it if it
 538          * is so. The format is something like sensor_name-dev0.
 539          */
 540
 541         const char *suffix = trigger_name + sensor_name_len + 1;
 542
 543         /* dev is the default, and lowest priority; no need to update */
 544         if (!memcmp(suffix, "dev", 3))
 545                 return;
 546
 547         /* If we found any-motion trigger, record it */
 548
 549         if (!memcmp(suffix, "any-motion-", 11)) {
 550                 strcpy(sensor_info[s].motion_trigger_name, trigger_name);
 551                 return;
 552         }
 553
 554         /*
 555          * It's neither the default "dev" nor an "any-motion" one. Make sure we
 556          * use this though, as we may not have any other indication of the name
 557          * of the trigger to use with this sensor.
 558          */
 559         strcpy(sensor_info[s].init_trigger_name, trigger_name);
 560 }
 561
 562
 563 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE])
 564 {
 565         /*
 566          * Check if we have a sensor matching the specified trigger name,
 567          * which should then begin with the sensor name, and end with a number
 568          * equal to the iio device number the sensor is associated to. If so,
 569          * update the string we're going to write to trigger/current_trigger
 570          * when enabling this sensor.
 571          */
 572
 573         int s;
 574         int dev_num;
 575         int len;
 576         char* cursor;
 577         int sensor_name_len;
 578
 579         /*
 580          * First determine the iio device number this trigger refers to. We
 581          * expect the last few characters (typically one) of the trigger name
 582          * to be this number, so perform a few checks.
 583          */
 584         len = strnlen(name, MAX_NAME_SIZE);
 585
 586         if (len < 2)
 587                 return;
 588
 589         cursor = name + len - 1;
 590
 591         if (!isdigit(*cursor))
 592                 return;
 593
 594         while (len && isdigit(*cursor)) {
 595                 len--;
 596                 cursor--;
 597         }
 598
 599         dev_num = atoi(cursor+1);
 600
 601         /* See if that matches a sensor */
 602         for (s=0; s<sensor_count; s++)
 603                 if (sensor_info[s].dev_num == dev_num) {
 604
 605                         sensor_name_len = strlen(sensor_info[s].internal_name);
 606
 607                         if (!strncmp(name,
 608                                      sensor_info[s].internal_name,
 609                                      sensor_name_len))
 610                                 /* Switch to new trigger if appropriate */
 611                                 propose_new_trigger(s, name, sensor_name_len);
 612                 }
 613 }
 614
 615
 616 static void setup_trigger_names (void)
 617 {
 618         char filename[PATH_MAX];
 619         char buf[MAX_NAME_SIZE];
 620         int len;
 621         int s;
 622         int trigger;
 623         int ret;
 624
 625         /* By default, use the name-dev convention that most drivers use */
 626         for (s=0; s<sensor_count; s++)
 627                 snprintf(sensor_info[s].init_trigger_name,
 628                          MAX_NAME_SIZE, "%s-dev%d",
 629                          sensor_info[s].internal_name, sensor_info[s].dev_num);
 630
 631         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 632
 633         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 634
 635                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH,trigger);
 636
 637                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 638
 639                 if (ret < 0)
 640                         break;
 641
 642                 /* Record initial and any-motion triggers names */
 643                 update_sensor_matching_trigger_name(buf);
 644         }
 645
 646         /*
 647          * Certain drivers expose only motion triggers even though they should
 648          * be continous. For these, use the default trigger name as the motion
 649          * trigger. The code generating intermediate events is dependent on
 650          * motion_trigger_name being set to a non empty string.
 651          */
 652
 653         for (s=0; s<sensor_count; s++)
 654                 if ((sensor_info[s].quirks & QUIRK_TERSE_DRIVER) &&
 655                     sensor_info[s].motion_trigger_name[0] == '\0')
 656                         strcpy( sensor_info[s].motion_trigger_name,
 657                                 sensor_info[s].init_trigger_name);
 658
 659         for (s=0; s<sensor_count; s++)
 660                 if (sensor_info[s].num_channels) {
 661                         ALOGI("Sensor %d (%s) default trigger: %s\n", s,
 662                                 sensor_info[s].friendly_name,
 663                                 sensor_info[s].init_trigger_name);
 664                         if (sensor_info[s].motion_trigger_name[0])
 665                                 ALOGI("Sensor %d (%s) motion trigger: %s\n",
 666                                 s, sensor_info[s].friendly_name,
 667                                 sensor_info[s].motion_trigger_name);
 668                 }
 669 }
 670
 671 static void uncalibrated_gyro_check (void)
 672 {
 673         unsigned int has_gyr = 0;
 674         unsigned int dev_num;
 675         int i, c;
 676         unsigned int is_poll_sensor;
 677         char buf[MAX_NAME_SIZE];
 678
 679         int cal_idx = 0;
 680         int uncal_idx = 0;
 681         int catalog_size = CATALOG_SIZE; /* Avoid GCC sign comparison warning */
 682
 683         /* Checking to see if we have a gyroscope - we can only have uncal if we have the base sensor */
 684         for (i=0; i < sensor_count; i++)
 685                 if (sensor_info[i].type == SENSOR_TYPE_GYROSCOPE) {
 686                         has_gyr=1;
 687                         dev_num = sensor_info[i].dev_num;
 688                         is_poll_sensor = !sensor_info[i].num_channels;
 689                         cal_idx = i;
 690                         break;
 691                 }
 692
 693         /*
 694          * If we have a gyro we can add the uncalibrated sensor of the same type and
 695          * on the same dev_num. We will save indexes for easy finding and also save the
 696          * channel specific information.
 697          */
 698         if (has_gyr)
 699                 for (i=0; i<catalog_size; i++)
 700                         if (sensor_catalog[i].type == SENSOR_TYPE_GYROSCOPE_UNCALIBRATED) {
 701                                 add_sensor(dev_num, i, is_poll_sensor);
 702
 703                                 uncal_idx = sensor_count - 1; /* Just added uncalibrated sensor */
 704
 705                                 /* Similar to build_sensor_report_maps */
 706                                 for (c = 0; c < sensor_info[uncal_idx].num_channels; c++)
 707                                 {
 708                                         memcpy( &(sensor_info[uncal_idx].channel[c].type_spec),
 709                                                 &(sensor_info[cal_idx].channel[c].type_spec),
 710                                                 sizeof(sensor_info[uncal_idx].channel[c].type_spec));
 711                                         sensor_info[uncal_idx].channel[c].type_info = sensor_info[cal_idx].channel[c].type_info;
 712                                         sensor_info[uncal_idx].channel[c].offset    = sensor_info[cal_idx].channel[c].offset;
 713                                         sensor_info[uncal_idx].channel[c].size      = sensor_info[cal_idx].channel[c].size;
 714                                 }
 715                                 sensor_info[uncal_idx].pair_idx = cal_idx;
 716                                 sensor_info[cal_idx].pair_idx = uncal_idx;
 717                                 strncpy(sensor_info[uncal_idx].init_trigger_name,
 718                                         sensor_info[cal_idx].init_trigger_name,
 719                                         MAX_NAME_SIZE);
 720                                 strncpy(sensor_info[uncal_idx].motion_trigger_name,
 721                                         sensor_info[cal_idx].motion_trigger_name,
 722                                         MAX_NAME_SIZE);
 723
 724                                 /* Add "Uncalibrated " prefix to sensor name */
 725                                 strcpy(buf, sensor_info[cal_idx].friendly_name);
 726                                 snprintf(sensor_info[uncal_idx].friendly_name,
 727                                          MAX_NAME_SIZE,
 728                                          "%s %s", "Uncalibrated", buf);
 729                                 break;
 730                         }
 731 }
 732
 733 void enumerate_sensors (void)
 734 {
 735         /*
 736          * Discover supported sensors and allocate control structures for them.
 737          * Multiple sensors can potentially rely on a single iio device (each
 738          * using their own channels). We can't have multiple sensors of the same
 739          * type on the same device. In case of detection as both a poll-mode
 740          * and trigger-based sensor, use the trigger usage mode.
 741          */
 742         char poll_sensors[CATALOG_SIZE];
 743         char trig_sensors[CATALOG_SIZE];
 744         int dev_num;
 745         unsigned int i;
 746         int trig_found;
 747
 748         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
 749                 trig_found = 0;
 750
 751                 discover_poll_sensors(dev_num, poll_sensors);
 752                 discover_trig_sensors(dev_num, trig_sensors);
 753
 754                 for (i=0; i<CATALOG_SIZE; i++)
 755                         if (trig_sensors[i]) {
 756                                 add_sensor(dev_num, i, 0);
 757                                 trig_found = 1;
 758                         }
 759                         else
 760                                 if (poll_sensors[i])
 761                                         add_sensor(dev_num, i, 1);
 762
 763                 if (trig_found) {
 764                         build_sensor_report_maps(dev_num);
 765                 }
 766         }
 767
 768         ALOGI("Discovered %d sensors\n", sensor_count);
 769
 770         /* Set up default - as well as custom - trigger names */
 771         setup_trigger_names();
 772
 773         /* Make sure Android fall backs to its own orientation sensor */
 774         orientation_sensor_check();
 775
 776         /*
 777          * Create the uncalibrated counterpart to the compensated gyroscope.
 778          * This is is a new sensor type in Android 4.4.
 779          */
 780
 781         /*
 782          * Patrick Porlan 11/12/2014 - Disabled for now due to a possible
 783          * relation with GMINL-3234 Panorama Drift. I take full responsability
 784          * for this.
 785          *
 786          * uncalibrated_gyro_check(); */
 787 }
 788
 789
 790 void delete_enumeration_data (void)
 791 {
 792         int i;
 793         for (i = 0; i < sensor_count; i++)
 794         switch (sensor_info[i].type) {
 795                 case SENSOR_TYPE_MAGNETIC_FIELD:
 796                         if (sensor_info[i].cal_data != NULL) {
 797                                 free(sensor_info[i].cal_data);
 798                                 sensor_info[i].cal_data = NULL;
 799                                 sensor_info[i].cal_level = 0;
 800                         }
 801                         break;
 802
 803                 case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 804                 case SENSOR_TYPE_GYROSCOPE:
 805                         if (sensor_info[i].cal_data != NULL) {
 806                                 free(sensor_info[i].cal_data);
 807                                 sensor_info[i].cal_data = NULL;
 808                                 sensor_info[i].cal_level = 0;
 809                         }
 810                         break;
 811
 812                 default:
 813                         break;
 814         }
 815         /* Reset sensor count */
 816         sensor_count = 0;
 817 }
 818
 819
 820 int get_sensors_list(   struct sensors_module_t* module,
 821                         struct sensor_t const** list)
 822 {
 823         *list = sensor_desc;
 824         return sensor_count;
 825 }
 826