enumeration.c

   1 /*
   2  * Copyright (C) 2014-2015 Intel Corporation.
   3  */
   4
   5 #include <ctype.h>
   6 #include <dirent.h>
   7 #include <stdlib.h>
   8 #include <fcntl.h>
   9 #include <utils/Log.h>
  10 #include <hardware/sensors.h>
  11 #include "enumeration.h"
  12 #include "description.h"
  13 #include "utils.h"
  14 #include "transform.h"
  15 #include "description.h"
  16 #include "control.h"
  17 #include "calibration.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 sensor_catalog_entry_t sensor_catalog[] = {
  33         {
  34                 .tag            = "accel",
  35                 .type           = SENSOR_TYPE_ACCELEROMETER,
  36                 .num_channels   = 3,
  37                 .is_virtual     = 0,
  38                 .channel = {
  39                         { DECLARE_NAMED_CHANNEL("accel", "x") },
  40                         { DECLARE_NAMED_CHANNEL("accel", "y") },
  41                         { DECLARE_NAMED_CHANNEL("accel", "z") },
  42                 },
  43         },
  44         {
  45                 .tag            = "anglvel",
  46                 .type           = SENSOR_TYPE_GYROSCOPE,
  47                 .num_channels   = 3,
  48                 .is_virtual     = 0,
  49                 .channel = {
  50                         { DECLARE_NAMED_CHANNEL("anglvel", "x") },
  51                         { DECLARE_NAMED_CHANNEL("anglvel", "y") },
  52                         { DECLARE_NAMED_CHANNEL("anglvel", "z") },
  53                 },
  54         },
  55         {
  56                 .tag            = "magn",
  57                 .type           = SENSOR_TYPE_MAGNETIC_FIELD,
  58                 .num_channels   = 3,
  59                 .is_virtual     = 0,
  60                 .channel = {
  61                         { DECLARE_NAMED_CHANNEL("magn", "x") },
  62                         { DECLARE_NAMED_CHANNEL("magn", "y") },
  63                         { DECLARE_NAMED_CHANNEL("magn", "z") },
  64                 },
  65         },
  66         {
  67                 .tag            = "intensity",
  68                 .type           = SENSOR_TYPE_INTERNAL_INTENSITY,
  69                 .num_channels   = 1,
  70                 .is_virtual     = 0,
  71                 .channel = {
  72                         { DECLARE_NAMED_CHANNEL("intensity", "both") },
  73                 },
  74         },
  75         {
  76                 .tag            = "illuminance",
  77                 .type           = SENSOR_TYPE_INTERNAL_ILLUMINANCE,
  78                 .num_channels   = 1,
  79                 .is_virtual     = 0,
  80                 .channel = {
  81                         { DECLARE_GENERIC_CHANNEL("illuminance") },
  82                 },
  83         },
  84         {
  85                 .tag            = "incli",
  86                 .type           = SENSOR_TYPE_ORIENTATION,
  87                 .num_channels   = 3,
  88                 .is_virtual     = 0,
  89                 .channel = {
  90                         { DECLARE_NAMED_CHANNEL("incli", "x") },
  91                         { DECLARE_NAMED_CHANNEL("incli", "y") },
  92                         { DECLARE_NAMED_CHANNEL("incli", "z") },
  93                 },
  94         },
  95         {
  96                 .tag            = "rot",
  97                 .type           = SENSOR_TYPE_ROTATION_VECTOR,
  98                 .num_channels   = 4,
  99                 .is_virtual     = 0,
 100                 .channel = {
 101                         { DECLARE_NAMED_CHANNEL("rot", "quat_x") },
 102                         { DECLARE_NAMED_CHANNEL("rot", "quat_y") },
 103                         { DECLARE_NAMED_CHANNEL("rot", "quat_z") },
 104                         { DECLARE_NAMED_CHANNEL("rot", "quat_w") },
 105                 },
 106         },
 107         {
 108                 .tag            = "temp",
 109                 .type           = SENSOR_TYPE_AMBIENT_TEMPERATURE,
 110                 .num_channels   = 1,
 111                 .is_virtual     = 0,
 112                 .channel = {
 113                         { DECLARE_GENERIC_CHANNEL("temp") },
 114                 },
 115         },
 116         {
 117                 .tag            = "proximity",
 118                 .type           = SENSOR_TYPE_PROXIMITY,
 119                 .num_channels   = 1,
 120                 .is_virtual     = 0,
 121                 .channel = {
 122                         { DECLARE_GENERIC_CHANNEL("proximity") },
 123                 },
 124         },
 125         {
 126                 .tag            = "",
 127                 .type           = SENSOR_TYPE_GYROSCOPE_UNCALIBRATED,
 128                 .num_channels   = 0,
 129                 .is_virtual     = 1,
 130                 .channel = {
 131                         { DECLARE_GENERIC_CHANNEL("") },
 132                 },
 133
 134         },
 135         {
 136                 .tag            = "",
 137                 .type           = SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
 138                 .num_channels   = 0,
 139                 .is_virtual     = 1,
 140                 .channel = {
 141                         { DECLARE_GENERIC_CHANNEL("") },
 142                 },
 143         },
 144         {
 145                 .tag            = "steps",
 146                 .type           = SENSOR_TYPE_STEP_COUNTER,
 147                 .num_channels   = 1,
 148                 .is_virtual     = 0,
 149                 .channel = {
 150                         { DECLARE_GENERIC_CHANNEL("steps") },
 151                 },
 152         },
 153         {
 154                 .tag            = "steps",
 155                 .type           = SENSOR_TYPE_STEP_DETECTOR,
 156                 .num_channels   = 1,
 157                 .is_virtual     = 0,
 158                 .channel = {
 159                         {
 160                                 DECLARE_VOID_CHANNEL("steps")
 161                                 .num_events = 1,
 162                                 .event = {
 163                                         { DECLARE_NAMED_EVENT("steps", "change") },
 164                                 },
 165                         },
 166                 },
 167         },
 168         {
 169                 .tag            = "proximity",
 170                 .type           = SENSOR_TYPE_PROXIMITY,
 171                 .num_channels   = 4,
 172                 .is_virtual     = 0,
 173                 .channel = {
 174                         {
 175                                 DECLARE_VOID_CHANNEL("proximity0")
 176                                 .num_events = 1,
 177                                 .event = {
 178                                         { DECLARE_EVENT("proximity0", "_", "", "", "thresh", "_", "either") },
 179                                 },
 180                         },
 181                         {
 182                                 DECLARE_VOID_CHANNEL("proximity1")
 183                                 .num_events = 1,
 184                                 .event = {
 185                                         { DECLARE_EVENT("proximity1", "_", "", "", "thresh", "_", "either") },
 186                                 },
 187                         },
 188                         {
 189                                 DECLARE_VOID_CHANNEL("proximity2")
 190                                 .num_events = 1,
 191                                 .event = {
 192                                         { DECLARE_EVENT("proximity2", "_", "", "", "thresh", "_", "either") },
 193                                 },
 194                         },
 195                         {
 196                                 DECLARE_VOID_CHANNEL("proximity3")
 197                                 .num_events = 1,
 198                                 .event = {
 199                                         { DECLARE_EVENT("proximity3", "_", "", "", "thresh", "_", "either") },
 200                                 },
 201                         },
 202                 },
 203         },
 204 };
 205
 206 unsigned int catalog_size = ARRAY_SIZE(sensor_catalog);
 207
 208 /* ACPI PLD (physical location of device) definitions, as used with sensors */
 209
 210 #define PANEL_FRONT     4
 211 #define PANEL_BACK      5
 212
 213 /* We equate sensor handles to indices in these tables */
 214
 215 struct sensor_t sensor_desc[MAX_SENSORS];       /* Android-level descriptors */
 216 sensor_info_t   sensor[MAX_SENSORS];            /* Internal descriptors      */
 217 int             sensor_count;                   /* Detected sensors          */
 218
 219
 220 /* if the sensor has an _en attribute, we need to enable it */
 221 int get_needs_enable(int dev_num, const char *tag)
 222 {
 223         char sysfs_path[PATH_MAX];
 224         int fd;
 225
 226         sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
 227
 228         fd = open(sysfs_path, O_RDWR);
 229         if (fd == -1)
 230                 return 0;
 231
 232         close(fd);
 233         return 1;
 234 }
 235
 236 static void setup_properties_from_pld (int s, int panel, int rotation,
 237                                        int num_channels)
 238 {
 239         /*
 240          * Generate suitable order and opt_scale directives from the PLD panel
 241          * and rotation codes we got. This can later be superseded by the usual
 242          * properties if necessary. Eventually we'll need to replace these
 243          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
 244          */
 245
 246         int x = 1;
 247         int y = 1;
 248         int z = 1;
 249         int xy_swap = 0;
 250         int angle = rotation * 45;
 251
 252         /* Only deal with 3 axis chips for now */
 253         if (num_channels < 3)
 254                 return;
 255
 256         if (panel == PANEL_BACK) {
 257                 /* Chip placed on the back panel ; negate x and z */
 258                 x = -x;
 259                 z = -z;
 260         }
 261
 262         switch (angle) {
 263                 case 90: /* 90° clockwise: negate y then swap x,y */
 264                         xy_swap = 1;
 265                         y = -y;
 266                         break;
 267
 268                 case 180: /* Upside down: negate x and y */
 269                         x = -x;
 270                         y = -y;
 271                         break;
 272
 273                 case 270: /* 90° counter clockwise: negate x then swap x,y */
 274                         x = -x;
 275                         xy_swap = 1;
 276                         break;
 277         }
 278
 279         if (xy_swap) {
 280                 sensor[s].order[0] = 1;
 281                 sensor[s].order[1] = 0;
 282                 sensor[s].order[2] = 2;
 283                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 284         }
 285
 286         sensor[s].channel[0].opt_scale = x;
 287         sensor[s].channel[1].opt_scale = y;
 288         sensor[s].channel[2].opt_scale = z;
 289 }
 290
 291
 292 static int is_valid_pld (int panel, int rotation)
 293 {
 294         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 295                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 296                 return 0;
 297         }
 298
 299         /* Only deal with 90° rotations for now */
 300         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 301                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 302                 return 0;
 303         }
 304
 305         return 1;
 306 }
 307
 308
 309 static int read_pld_from_properties (int s, int* panel, int* rotation)
 310 {
 311         int p, r;
 312
 313         if (sensor_get_prop(s, "panel", &p))
 314                 return -1;
 315
 316         if (sensor_get_prop(s, "rotation", &r))
 317                 return -1;
 318
 319         if (!is_valid_pld(p, r))
 320                 return -1;
 321
 322         *panel = p;
 323         *rotation = r;
 324
 325         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 326
 327         return 0;
 328 }
 329
 330
 331 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 332 {
 333         char sysfs_path[PATH_MAX];
 334         int p,r;
 335
 336         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 337
 338         if (sysfs_read_int(sysfs_path, &p))
 339                 return -1;
 340
 341         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 342
 343         if (sysfs_read_int(sysfs_path, &r))
 344                 return -1;
 345
 346         if (!is_valid_pld(p, r))
 347                 return -1;
 348
 349         *panel = p;
 350         *rotation = r;
 351
 352         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 353
 354         return 0;
 355 }
 356
 357
 358 static void decode_placement_information (int dev_num, int num_channels, int s)
 359 {
 360         /*
 361          * See if we have optional "physical location of device" ACPI tags.
 362          * We're only interested in panel and rotation specifiers. Use the
 363          * .panel and .rotation properties in priority, and the actual ACPI
 364          * values as a second source.
 365          */
 366
 367         int panel;
 368         int rotation;
 369
 370         if (read_pld_from_properties(s, &panel, &rotation) &&
 371                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 372                         return; /* No PLD data available */
 373
 374         /* Map that to field ordering and scaling mechanisms */
 375         setup_properties_from_pld(s, panel, rotation, num_channels);
 376 }
 377
 378
 379 static int map_internal_to_external_type (int sensor_type)
 380 {
 381         /* Most sensors are internally identified using the Android type, but for some we use a different type specification internally */
 382
 383         switch (sensor_type) {
 384                 case SENSOR_TYPE_INTERNAL_ILLUMINANCE:
 385                 case SENSOR_TYPE_INTERNAL_INTENSITY:
 386                         return SENSOR_TYPE_LIGHT;
 387
 388                 default:
 389                         return sensor_type;
 390         }
 391 }
 392
 393 static void populate_descriptors (int s, int sensor_type)
 394 {
 395         int32_t         min_delay_us;
 396         max_delay_t     max_delay_us;
 397
 398         /* Initialize Android-visible descriptor */
 399         sensor_desc[s].name             = sensor_get_name(s);
 400         sensor_desc[s].vendor           = sensor_get_vendor(s);
 401         sensor_desc[s].version          = sensor_get_version(s);
 402         sensor_desc[s].handle           = s;
 403         sensor_desc[s].type             = map_internal_to_external_type(sensor_type);
 404
 405         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 406         sensor_desc[s].resolution       = sensor_get_resolution(s);
 407         sensor_desc[s].power            = sensor_get_power(s);
 408         sensor_desc[s].stringType       = sensor_get_string_type(s);
 409
 410         /* None of our supported sensors requires a special permission */
 411         sensor_desc[s].requiredPermission = "";
 412
 413         sensor_desc[s].flags = sensor_get_flags(s);
 414         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 415         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 416
 417         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 418                 s, sensor[s].friendly_name, sensor_desc[s].type,
 419                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 420                 sensor_desc[s].flags);
 421
 422         /* We currently do not implement batching */
 423         sensor_desc[s].fifoReservedEventCount = 0;
 424         sensor_desc[s].fifoMaxEventCount = 0;
 425
 426         min_delay_us = sensor_desc[s].minDelay;
 427         max_delay_us = sensor_desc[s].maxDelay;
 428
 429         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 430         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 431 }
 432
 433
 434 static void add_virtual_sensor (int catalog_index)
 435 {
 436         int s;
 437         int sensor_type;
 438
 439         if (sensor_count == MAX_SENSORS) {
 440                 ALOGE("Too many sensors!\n");
 441                 return;
 442         }
 443
 444         sensor_type = sensor_catalog[catalog_index].type;
 445
 446         s = sensor_count;
 447
 448         sensor[s].is_virtual = 1;
 449         sensor[s].catalog_index = catalog_index;
 450         sensor[s].type          = sensor_type;
 451
 452         populate_descriptors(s, sensor_type);
 453
 454         /* Initialize fields related to sysfs reads offloading */
 455         sensor[s].thread_data_fd[0]  = -1;
 456         sensor[s].thread_data_fd[1]  = -1;
 457         sensor[s].acquisition_thread = -1;
 458
 459         sensor_count++;
 460 }
 461
 462
 463 static int add_sensor (int dev_num, int catalog_index, int mode)
 464 {
 465         int s;
 466         int sensor_type;
 467         int retval;
 468         char sysfs_path[PATH_MAX];
 469         const char* prefix;
 470         float scale;
 471         int c;
 472         float opt_scale;
 473         const char* ch_name;
 474         int num_channels;
 475         char suffix[MAX_NAME_SIZE + 8];
 476         int calib_bias;
 477
 478         if (sensor_count == MAX_SENSORS) {
 479                 ALOGE("Too many sensors!\n");
 480                 return -1;
 481         }
 482
 483         sensor_type = sensor_catalog[catalog_index].type;
 484
 485         /*
 486          * At this point we could check that the expected sysfs attributes are
 487          * present ; that would enable having multiple catalog entries with the
 488          * same sensor type, accomodating different sets of sysfs attributes.
 489          */
 490
 491         s = sensor_count;
 492
 493         sensor[s].dev_num       = dev_num;
 494         sensor[s].catalog_index = catalog_index;
 495         sensor[s].type          = sensor_type;
 496         sensor[s].mode          = mode;
 497
 498         num_channels = sensor_catalog[catalog_index].num_channels;
 499
 500         if (mode == MODE_POLL)
 501                 sensor[s].num_channels = 0;
 502         else
 503                 sensor[s].num_channels = num_channels;
 504
 505         /* Populate the quirks array */
 506         sensor_get_quirks(s);
 507
 508         /* Reject interfaces that may have been disabled through a quirk for this driver */
 509         if ((mode == MODE_EVENT   && (sensor[s].quirks & QUIRK_NO_EVENT_MODE)) ||
 510             (mode == MODE_TRIGGER && (sensor[s].quirks & QUIRK_NO_TRIG_MODE )) ||
 511             (mode == MODE_POLL    && (sensor[s].quirks & QUIRK_NO_POLL_MODE ))) {
 512                 memset(&sensor[s], 0, sizeof(sensor[0]));
 513                 return -1;
 514         }
 515
 516         prefix = sensor_catalog[catalog_index].tag;
 517
 518         /*
 519          * receiving the illumination sensor calibration inputs from
 520          * the Android properties and setting it within sysfs
 521          */
 522         if (sensor_type == SENSOR_TYPE_INTERNAL_ILLUMINANCE) {
 523                 retval = sensor_get_illumincalib(s);
 524                 if (retval > 0) {
 525                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 526                         sysfs_write_int(sysfs_path, retval);
 527                 }
 528         }
 529
 530         /*
 531          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 532          * iio.accel.y.calib_bias = -1, or possibly something like iio.temp.calib_bias if the sensor has a single channel. This value gets stored in the
 533          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 534          */
 535
 536         if (num_channels) {
 537                 for (c = 0; c < num_channels; c++) {
 538                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 539                         sprintf(suffix, "%s.calib_bias", ch_name);
 540                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 541                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 542                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 543                                 sysfs_write_int(sysfs_path, calib_bias);
 544                         }
 545                 }
 546         } else
 547                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 548                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 549                                 sysfs_write_int(sysfs_path, calib_bias);
 550                         }
 551
 552         /* Read name attribute, if available */
 553         sprintf(sysfs_path, NAME_PATH, dev_num);
 554         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 555
 556         /* See if we have general offsets and scale values for this sensor */
 557
 558         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 559         sysfs_read_float(sysfs_path, &sensor[s].offset);
 560
 561         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 562         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 563                 /*
 564                  * There is a chip preferred scale specified,
 565                  * so try to store it in sensor's scale file
 566                  */
 567                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 568                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 569                         /* Store failed, try to store the scale into channel specific file */
 570                         for (c = 0; c < num_channels; c++)
 571                         {
 572                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 573                                         sensor_catalog[catalog_index].channel[c].scale_path);
 574                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 575                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 576                         }
 577                 }
 578         }
 579
 580         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 581         if (!sysfs_read_float(sysfs_path, &scale)) {
 582                 sensor[s].scale = scale;
 583                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 584                                         sysfs_path, scale, dev_num);
 585         } else {
 586                 sensor[s].scale = 1;
 587
 588                 /* Read channel specific scale if any*/
 589                 for (c = 0; c < num_channels; c++)
 590                 {
 591                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 592                            sensor_catalog[catalog_index].channel[c].scale_path);
 593
 594                         if (!sysfs_read_float(sysfs_path, &scale)) {
 595                                 sensor[s].channel[c].scale = scale;
 596                                 sensor[s].scale = 0;
 597
 598                                 ALOGV(  "Scale path:%s "
 599                                         "channel scale:%g dev_num:%d\n",
 600                                         sysfs_path, scale, dev_num);
 601                         }
 602                 }
 603         }
 604
 605         /* Set default scaling - if num_channels is zero, we have one channel */
 606
 607         sensor[s].channel[0].opt_scale = 1;
 608
 609         for (c = 1; c < num_channels; c++)
 610                 sensor[s].channel[c].opt_scale = 1;
 611
 612         for (c = 0; c < num_channels; c++) {
 613                 /* Check the presence of the channel's input_path */
 614                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 615                         sensor_catalog[catalog_index].channel[c].input_path);
 616                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 617                 /* Check the presence of the channel's raw_path */
 618                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 619                         sensor_catalog[catalog_index].channel[c].raw_path);
 620                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 621         }
 622
 623         /* Read ACPI _PLD attributes for this sensor, if there are any */
 624         decode_placement_information(dev_num, num_channels, s);
 625
 626         /*
 627          * See if we have optional correction scaling factors for each of the
 628          * channels of this sensor. These would be expressed using properties
 629          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 630          * support things such as iio.temp.opt_scale = -1. Note that this works
 631          * for all types of sensors, and whatever transform is selected, on top
 632          * of any previous conversions.
 633          */
 634
 635         if (num_channels) {
 636                 for (c = 0; c < num_channels; c++) {
 637                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 638                         sprintf(suffix, "%s.opt_scale", ch_name);
 639                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 640                                 sensor[s].channel[c].opt_scale = opt_scale;
 641                 }
 642         } else {
 643                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 644                         sensor[s].channel[0].opt_scale = opt_scale;
 645         }
 646
 647         populate_descriptors(s, sensor_type);
 648
 649         if (sensor[s].internal_name[0] == '\0') {
 650                 /*
 651                  * In case the kernel-mode driver doesn't expose a name for
 652                  * the iio device, use (null)-dev%d as the trigger name...
 653                  * This can be considered a kernel-mode iio driver bug.
 654                  */
 655                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 656                 strcpy(sensor[s].internal_name, "(null)");
 657         }
 658
 659         switch (sensor_type) {
 660                 case SENSOR_TYPE_ACCELEROMETER:
 661                         /* Only engage accelerometer bias compensation if really needed */
 662                         if (sensor_get_quirks(s) & QUIRK_BIASED)
 663                                 sensor[s].cal_data = calloc(1, sizeof(accel_cal_t));
 664                         break;
 665
 666                         case SENSOR_TYPE_GYROSCOPE:
 667                         sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
 668                         break;
 669
 670                 case SENSOR_TYPE_MAGNETIC_FIELD:
 671                         sensor[s].cal_data = malloc(sizeof(compass_cal_t));
 672                         break;
 673         }
 674
 675         sensor[s].max_cal_level = sensor_get_cal_steps(s);
 676
 677         /* Select one of the available sensor sample processing styles */
 678         select_transform(s);
 679
 680         /* Initialize fields related to sysfs reads offloading */
 681         sensor[s].thread_data_fd[0]  = -1;
 682         sensor[s].thread_data_fd[1]  = -1;
 683         sensor[s].acquisition_thread = -1;
 684
 685         /* Check if we have a special ordering property on this sensor */
 686         if (sensor_get_order(s, sensor[s].order))
 687                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 688
 689         sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
 690
 691         sensor_count++;
 692         return 0;
 693 }
 694
 695 static void virtual_sensors_check (void)
 696 {
 697         int i;
 698         int has_acc = 0;
 699         int has_gyr = 0;
 700         int has_mag = 0;
 701         int has_rot = 0;
 702         int has_ori = 0;
 703         int gyro_cal_idx = 0;
 704         int magn_cal_idx = 0;
 705         unsigned int j;
 706
 707         for (i=0; i<sensor_count; i++)
 708                 switch (sensor[i].type) {
 709                         case SENSOR_TYPE_ACCELEROMETER:
 710                                 has_acc = 1;
 711                                 break;
 712                         case SENSOR_TYPE_GYROSCOPE:
 713                                 has_gyr = 1;
 714                                 gyro_cal_idx = i;
 715                                 break;
 716                         case SENSOR_TYPE_MAGNETIC_FIELD:
 717                                 has_mag = 1;
 718                                 magn_cal_idx = i;
 719                                 break;
 720                         case SENSOR_TYPE_ORIENTATION:
 721                                 has_ori = 1;
 722                                 break;
 723                         case SENSOR_TYPE_ROTATION_VECTOR:
 724                                 has_rot = 1;
 725                                 break;
 726                 }
 727
 728         for (j=0; j<catalog_size; j++)
 729                 switch (sensor_catalog[j].type) {
 730                         /*
 731                          * If we have accel + gyro + magn but no rotation vector sensor,
 732                          * SensorService replaces the HAL provided orientation sensor by the
 733                          * AOSP version... provided we report one. So initialize a virtual
 734                          * orientation sensor with zero values, which will get replaced. See:
 735                          * frameworks/native/services/sensorservice/SensorService.cpp, looking
 736                          * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 737                          * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 738                          */
 739
 740                         case SENSOR_TYPE_ORIENTATION:
 741                                 if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 742                                         add_sensor(0, j, MODE_POLL);
 743                                 break;
 744                         case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 745                                 if (has_gyr) {
 746                                         sensor[sensor_count].base_count = 1;
 747                                         sensor[sensor_count].base[0] = gyro_cal_idx;
 748                                         add_virtual_sensor(j);
 749                                 }
 750                                 break;
 751                         case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
 752                                 if (has_mag) {
 753                                         sensor[sensor_count].base_count = 1;
 754                                         sensor[sensor_count].base[0] = magn_cal_idx;
 755                                         add_virtual_sensor(j);
 756                                 }
 757                                 break;
 758                         default:
 759                                 break;
 760                 }
 761 }
 762
 763
 764 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 765                                  int sensor_name_len)
 766 {
 767         /*
 768          * A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
 769          *  and select it if it is so. The format is something like sensor_name-dev0.
 770          */
 771
 772         const char *suffix = trigger_name + sensor_name_len + 1;
 773
 774         /* dev is the default, and lowest priority; no need to update */
 775         if (!memcmp(suffix, "dev", 3))
 776                 return;
 777
 778         /* If we found any-motion trigger, record it */
 779
 780         if (!memcmp(suffix, "any-motion-", 11)) {
 781                 strcpy(sensor[s].motion_trigger_name, trigger_name);
 782                 return;
 783         }
 784
 785         /*
 786          * It's neither the default "dev" nor an "any-motion" one. Make sure we use this though, as we may not have any other indication of the name
 787          * of the trigger to use with this sensor.
 788          */
 789         strcpy(sensor[s].init_trigger_name, trigger_name);
 790 }
 791
 792
 793 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE])
 794 {
 795         /*
 796          * Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
 797          * equal to the iio device number the sensor is associated to. If so, update the string we're going to write to trigger/current_trigger
 798          * when enabling this sensor.
 799          */
 800
 801         int s;
 802         int dev_num;
 803         int len;
 804         char* cursor;
 805         int sensor_name_len;
 806
 807         /*
 808          * First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
 809          * to be this number, so perform a few checks.
 810          */
 811         len = strnlen(name, MAX_NAME_SIZE);
 812
 813         if (len < 2)
 814                 return;
 815
 816         cursor = name + len - 1;
 817
 818         if (!isdigit(*cursor))
 819                 return;
 820
 821         while (len && isdigit(*cursor)) {
 822                 len--;
 823                 cursor--;
 824         }
 825
 826         dev_num = atoi(cursor+1);
 827
 828         /* See if that matches a sensor */
 829         for (s=0; s<sensor_count; s++)
 830                 if (sensor[s].dev_num == dev_num) {
 831
 832                         sensor_name_len = strlen(sensor[s].internal_name);
 833
 834                         if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
 835                                 /* Switch to new trigger if appropriate */
 836                                 propose_new_trigger(s, name, sensor_name_len);
 837                 }
 838 }
 839
 840
 841 static void setup_trigger_names (void)
 842 {
 843         char filename[PATH_MAX];
 844         char buf[MAX_NAME_SIZE];
 845         int s;
 846         int trigger;
 847         int ret;
 848
 849         /* By default, use the name-dev convention that most drivers use */
 850         for (s=0; s<sensor_count; s++)
 851                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 852
 853         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 854
 855         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 856
 857                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH,trigger);
 858
 859                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 860
 861                 if (ret < 0)
 862                         break;
 863
 864                 /* Record initial and any-motion triggers names */
 865                 update_sensor_matching_trigger_name(buf);
 866         }
 867
 868         /*
 869          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 870          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 871          */
 872
 873         for (s=0; s<sensor_count; s++)
 874                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 875                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 876
 877         for (s=0; s<sensor_count; s++)
 878                 if (sensor[s].mode == MODE_TRIGGER) {
 879                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 880                         if (sensor[s].motion_trigger_name[0])
 881                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 882                 }
 883 }
 884
 885
 886 static int catalog_index_from_sensor_type (int type)
 887 {
 888         /* Return first matching catalog entry index for selected type */
 889         unsigned int i;
 890
 891         for (i=0; i<catalog_size; i++)
 892                 if (sensor_catalog[i].type == type)
 893                         return i;
 894
 895         return -1;
 896 }
 897
 898
 899 static void post_process_sensor_list (char poll_map[catalog_size], char trig_map[catalog_size], char event_map[catalog_size])
 900 {
 901         int illuminance_cat_index = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_ILLUMINANCE);
 902         int intensity_cat_index   = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_INTENSITY);
 903         int illuminance_found     = poll_map[illuminance_cat_index] || trig_map[illuminance_cat_index] || event_map[illuminance_cat_index];
 904
 905         /* If an illumimance sensor has been reported */
 906         if (illuminance_found) {
 907                 /* Hide any intensity sensors we can have for the same iio device */
 908                 poll_map [intensity_cat_index     ] = 0;
 909                 trig_map [intensity_cat_index     ] = 0;
 910                 event_map[intensity_cat_index     ] = 0;
 911                 return;
 912         }
 913 }
 914
 915
 916 void enumerate_sensors (void)
 917 {
 918         /*
 919          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
 920          * using their own channels). We can't have multiple sensors of the same type on the same device. In case of detection as both a poll-mode
 921          * and trigger-based sensor, use the trigger usage mode.
 922          */
 923         char poll_sensors[catalog_size];
 924         char trig_sensors[catalog_size];
 925         char event_sensors[catalog_size];
 926         int dev_num;
 927         unsigned int i;
 928         int trig_found;
 929
 930         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
 931                 trig_found = 0;
 932
 933                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
 934                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
 935                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
 936
 937                 /* Hide specific sensor types if appropriate */
 938                 post_process_sensor_list(poll_sensors, trig_sensors, event_sensors);
 939
 940                 for (i=0; i<catalog_size; i++) {
 941                         /* Try using events interface */
 942                         if (event_sensors[i] && !add_sensor(dev_num, i, MODE_EVENT))
 943                                 continue;
 944
 945                         /* Then trigger */
 946                         if (trig_sensors[i] && !add_sensor(dev_num, i, MODE_TRIGGER)) {
 947                                 trig_found = 1;
 948                                 continue;
 949                         }
 950
 951                         /* Try polling otherwise */
 952                         if (poll_sensors[i])
 953                                 add_sensor(dev_num, i, MODE_POLL);
 954                 }
 955
 956                 if (trig_found)
 957                         build_sensor_report_maps(dev_num);
 958         }
 959
 960         ALOGI("Discovered %d sensors\n", sensor_count);
 961
 962         /* Set up default - as well as custom - trigger names */
 963         setup_trigger_names();
 964
 965         virtual_sensors_check();
 966 }
 967
 968
 969 void delete_enumeration_data (void)
 970 {
 971         int i;
 972         for (i = 0; i < sensor_count; i++)
 973                 if (sensor[i].cal_data) {
 974                         free(sensor[i].cal_data);
 975                         sensor[i].cal_data = NULL;
 976                         sensor[i].cal_level = 0;
 977                 }
 978
 979         /* Reset sensor count */
 980         sensor_count = 0;
 981 }
 982
 983
 984 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
 985                       struct sensor_t const** list)
 986 {
 987         *list = sensor_desc;
 988         return sensor_count;
 989 }
 990