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