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_LIGHT,
  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_LIGHT,
  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 void populate_descriptors (int s, int sensor_type)
 380 {
 381         int32_t         min_delay_us;
 382         max_delay_t     max_delay_us;
 383
 384         /* Initialize Android-visible descriptor */
 385         sensor_desc[s].name             = sensor_get_name(s);
 386         sensor_desc[s].vendor           = sensor_get_vendor(s);
 387         sensor_desc[s].version          = sensor_get_version(s);
 388         sensor_desc[s].handle           = s;
 389         sensor_desc[s].type             = sensor_type;
 390
 391         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 392         sensor_desc[s].resolution       = sensor_get_resolution(s);
 393         sensor_desc[s].power            = sensor_get_power(s);
 394         sensor_desc[s].stringType       = sensor_get_string_type(s);
 395
 396         /* None of our supported sensors requires a special permission */
 397         sensor_desc[s].requiredPermission = "";
 398
 399         sensor_desc[s].flags = sensor_get_flags(s);
 400         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 401         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 402
 403         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 404                 s, sensor[s].friendly_name, sensor_desc[s].type,
 405                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 406                 sensor_desc[s].flags);
 407
 408         /* We currently do not implement batching */
 409         sensor_desc[s].fifoReservedEventCount = 0;
 410         sensor_desc[s].fifoMaxEventCount = 0;
 411
 412         min_delay_us = sensor_desc[s].minDelay;
 413         max_delay_us = sensor_desc[s].maxDelay;
 414
 415         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 416         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 417 }
 418
 419
 420 static void add_virtual_sensor (int catalog_index)
 421 {
 422         int s;
 423         int sensor_type;
 424
 425         if (sensor_count == MAX_SENSORS) {
 426                 ALOGE("Too many sensors!\n");
 427                 return;
 428         }
 429
 430         sensor_type = sensor_catalog[catalog_index].type;
 431
 432         s = sensor_count;
 433
 434         sensor[s].is_virtual = 1;
 435         sensor[s].catalog_index = catalog_index;
 436         sensor[s].type          = sensor_type;
 437
 438         populate_descriptors(s, sensor_type);
 439
 440         /* Initialize fields related to sysfs reads offloading */
 441         sensor[s].thread_data_fd[0]  = -1;
 442         sensor[s].thread_data_fd[1]  = -1;
 443         sensor[s].acquisition_thread = -1;
 444
 445         sensor_count++;
 446 }
 447
 448
 449 static void add_sensor (int dev_num, int catalog_index, int mode)
 450 {
 451         int s;
 452         int sensor_type;
 453         int retval;
 454         char sysfs_path[PATH_MAX];
 455         const char* prefix;
 456         float scale;
 457         int c;
 458         float opt_scale;
 459         const char* ch_name;
 460         int num_channels;
 461         char suffix[MAX_NAME_SIZE + 8];
 462         int calib_bias;
 463
 464         if (sensor_count == MAX_SENSORS) {
 465                 ALOGE("Too many sensors!\n");
 466                 return;
 467         }
 468
 469         sensor_type = sensor_catalog[catalog_index].type;
 470
 471         /*
 472          * At this point we could check that the expected sysfs attributes are
 473          * present ; that would enable having multiple catalog entries with the
 474          * same sensor type, accomodating different sets of sysfs attributes.
 475          */
 476
 477         s = sensor_count;
 478
 479         sensor[s].dev_num       = dev_num;
 480         sensor[s].catalog_index = catalog_index;
 481         sensor[s].type          = sensor_type;
 482         sensor[s].mode          = mode;
 483
 484         num_channels = sensor_catalog[catalog_index].num_channels;
 485
 486         if (mode == MODE_POLL)
 487                 sensor[s].num_channels = 0;
 488         else
 489                 sensor[s].num_channels = num_channels;
 490
 491         prefix = sensor_catalog[catalog_index].tag;
 492
 493         /*
 494          * receiving the illumination sensor calibration inputs from
 495          * the Android properties and setting it within sysfs
 496          */
 497         if (sensor_type == SENSOR_TYPE_LIGHT) {
 498                 retval = sensor_get_illumincalib(s);
 499                 if (retval > 0) {
 500                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 501                         sysfs_write_int(sysfs_path, retval);
 502                 }
 503         }
 504
 505         /*
 506          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 507          * 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
 508          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 509          */
 510
 511         if (num_channels) {
 512                 for (c = 0; c < num_channels; c++) {
 513                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 514                         sprintf(suffix, "%s.calib_bias", ch_name);
 515                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 516                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 517                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 518                                 sysfs_write_int(sysfs_path, calib_bias);
 519                         }
 520                 }
 521         } else
 522                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 523                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 524                                 sysfs_write_int(sysfs_path, calib_bias);
 525                         }
 526
 527         /* Read name attribute, if available */
 528         sprintf(sysfs_path, NAME_PATH, dev_num);
 529         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 530
 531         /* See if we have general offsets and scale values for this sensor */
 532
 533         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 534         sysfs_read_float(sysfs_path, &sensor[s].offset);
 535
 536         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 537         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 538                 /*
 539                  * There is a chip preferred scale specified,
 540                  * so try to store it in sensor's scale file
 541                  */
 542                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 543                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 544                         /* Store failed, try to store the scale into channel specific file */
 545                         for (c = 0; c < num_channels; c++)
 546                         {
 547                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 548                                         sensor_catalog[catalog_index].channel[c].scale_path);
 549                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 550                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 551                         }
 552                 }
 553         }
 554
 555         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 556         if (!sysfs_read_float(sysfs_path, &scale)) {
 557                 sensor[s].scale = scale;
 558                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 559                                         sysfs_path, scale, dev_num);
 560         } else {
 561                 sensor[s].scale = 1;
 562
 563                 /* Read channel specific scale if any*/
 564                 for (c = 0; c < num_channels; c++)
 565                 {
 566                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 567                            sensor_catalog[catalog_index].channel[c].scale_path);
 568
 569                         if (!sysfs_read_float(sysfs_path, &scale)) {
 570                                 sensor[s].channel[c].scale = scale;
 571                                 sensor[s].scale = 0;
 572
 573                                 ALOGV(  "Scale path:%s "
 574                                         "channel scale:%g dev_num:%d\n",
 575                                         sysfs_path, scale, dev_num);
 576                         }
 577                 }
 578         }
 579
 580         /* Set default scaling - if num_channels is zero, we have one channel */
 581
 582         sensor[s].channel[0].opt_scale = 1;
 583
 584         for (c = 1; c < num_channels; c++)
 585                 sensor[s].channel[c].opt_scale = 1;
 586
 587         for (c = 0; c < num_channels; c++) {
 588                 /* Check the presence of the channel's input_path */
 589                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 590                         sensor_catalog[catalog_index].channel[c].input_path);
 591                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 592                 /* Check the presence of the channel's raw_path */
 593                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 594                         sensor_catalog[catalog_index].channel[c].raw_path);
 595                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 596         }
 597
 598         /* Read ACPI _PLD attributes for this sensor, if there are any */
 599         decode_placement_information(dev_num, num_channels, s);
 600
 601         /*
 602          * See if we have optional correction scaling factors for each of the
 603          * channels of this sensor. These would be expressed using properties
 604          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 605          * support things such as iio.temp.opt_scale = -1. Note that this works
 606          * for all types of sensors, and whatever transform is selected, on top
 607          * of any previous conversions.
 608          */
 609
 610         if (num_channels) {
 611                 for (c = 0; c < num_channels; c++) {
 612                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 613                         sprintf(suffix, "%s.opt_scale", ch_name);
 614                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 615                                 sensor[s].channel[c].opt_scale = opt_scale;
 616                 }
 617         } else
 618                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 619                         sensor[s].channel[0].opt_scale = opt_scale;
 620
 621         populate_descriptors(s, sensor_type);
 622
 623         /* Populate the quirks array */
 624         sensor_get_quirks(s);
 625
 626         if (sensor[s].internal_name[0] == '\0') {
 627                 /*
 628                  * In case the kernel-mode driver doesn't expose a name for
 629                  * the iio device, use (null)-dev%d as the trigger name...
 630                  * This can be considered a kernel-mode iio driver bug.
 631                  */
 632                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 633                 strcpy(sensor[s].internal_name, "(null)");
 634         }
 635
 636         switch (sensor_type) {
 637                 case SENSOR_TYPE_ACCELEROMETER:
 638                         /* Only engage accelerometer bias compensation if really needed */
 639                         if (sensor_get_quirks(s) & QUIRK_BIASED)
 640                                 sensor[s].cal_data = calloc(1, sizeof(accel_cal_t));
 641                         break;
 642
 643                         case SENSOR_TYPE_GYROSCOPE:
 644                         sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
 645                         break;
 646
 647                 case SENSOR_TYPE_MAGNETIC_FIELD:
 648                         sensor[s].cal_data = malloc(sizeof(compass_cal_t));
 649                         break;
 650         }
 651
 652         sensor[s].max_cal_level = sensor_get_cal_steps(s);
 653
 654         /* Select one of the available sensor sample processing styles */
 655         select_transform(s);
 656
 657         /* Initialize fields related to sysfs reads offloading */
 658         sensor[s].thread_data_fd[0]  = -1;
 659         sensor[s].thread_data_fd[1]  = -1;
 660         sensor[s].acquisition_thread = -1;
 661
 662         /* Check if we have a special ordering property on this sensor */
 663         if (sensor_get_order(s, sensor[s].order))
 664                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 665
 666         sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
 667
 668         sensor_count++;
 669 }
 670
 671 static void virtual_sensors_check (void)
 672 {
 673         int i;
 674         int has_acc = 0;
 675         int has_gyr = 0;
 676         int has_mag = 0;
 677         int has_rot = 0;
 678         int has_ori = 0;
 679         int gyro_cal_idx = 0;
 680         int magn_cal_idx = 0;
 681         unsigned int j;
 682
 683         for (i=0; i<sensor_count; i++)
 684                 switch (sensor[i].type) {
 685                         case SENSOR_TYPE_ACCELEROMETER:
 686                                 has_acc = 1;
 687                                 break;
 688                         case SENSOR_TYPE_GYROSCOPE:
 689                                 has_gyr = 1;
 690                                 gyro_cal_idx = i;
 691                                 break;
 692                         case SENSOR_TYPE_MAGNETIC_FIELD:
 693                                 has_mag = 1;
 694                                 magn_cal_idx = i;
 695                                 break;
 696                         case SENSOR_TYPE_ORIENTATION:
 697                                 has_ori = 1;
 698                                 break;
 699                         case SENSOR_TYPE_ROTATION_VECTOR:
 700                                 has_rot = 1;
 701                                 break;
 702                 }
 703
 704         for (j=0; j<catalog_size; j++)
 705                 switch (sensor_catalog[j].type) {
 706                         /*
 707                          * If we have accel + gyro + magn but no rotation vector sensor,
 708                          * SensorService replaces the HAL provided orientation sensor by the
 709                          * AOSP version... provided we report one. So initialize a virtual
 710                          * orientation sensor with zero values, which will get replaced. See:
 711                          * frameworks/native/services/sensorservice/SensorService.cpp, looking
 712                          * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 713                          * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 714                          */
 715
 716                         case SENSOR_TYPE_ORIENTATION:
 717                                 if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 718                                         add_sensor(0, j, MODE_POLL);
 719                                 break;
 720                         case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 721                                 if (has_gyr) {
 722                                         sensor[sensor_count].base_count = 1;
 723                                         sensor[sensor_count].base[0] = gyro_cal_idx;
 724                                         add_virtual_sensor(j);
 725                                 }
 726                                 break;
 727                         case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
 728                                 if (has_mag) {
 729                                         sensor[sensor_count].base_count = 1;
 730                                         sensor[sensor_count].base[0] = magn_cal_idx;
 731                                         add_virtual_sensor(j);
 732                                 }
 733                                 break;
 734                         default:
 735                                 break;
 736                 }
 737 }
 738
 739
 740 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 741                                  int sensor_name_len)
 742 {
 743         /*
 744          * A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
 745          *  and select it if it is so. The format is something like sensor_name-dev0.
 746          */
 747
 748         const char *suffix = trigger_name + sensor_name_len + 1;
 749
 750         /* dev is the default, and lowest priority; no need to update */
 751         if (!memcmp(suffix, "dev", 3))
 752                 return;
 753
 754         /* If we found any-motion trigger, record it */
 755
 756         if (!memcmp(suffix, "any-motion-", 11)) {
 757                 strcpy(sensor[s].motion_trigger_name, trigger_name);
 758                 return;
 759         }
 760
 761         /*
 762          * 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
 763          * of the trigger to use with this sensor.
 764          */
 765         strcpy(sensor[s].init_trigger_name, trigger_name);
 766 }
 767
 768
 769 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE])
 770 {
 771         /*
 772          * Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
 773          * 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
 774          * when enabling this sensor.
 775          */
 776
 777         int s;
 778         int dev_num;
 779         int len;
 780         char* cursor;
 781         int sensor_name_len;
 782
 783         /*
 784          * First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
 785          * to be this number, so perform a few checks.
 786          */
 787         len = strnlen(name, MAX_NAME_SIZE);
 788
 789         if (len < 2)
 790                 return;
 791
 792         cursor = name + len - 1;
 793
 794         if (!isdigit(*cursor))
 795                 return;
 796
 797         while (len && isdigit(*cursor)) {
 798                 len--;
 799                 cursor--;
 800         }
 801
 802         dev_num = atoi(cursor+1);
 803
 804         /* See if that matches a sensor */
 805         for (s=0; s<sensor_count; s++)
 806                 if (sensor[s].dev_num == dev_num) {
 807
 808                         sensor_name_len = strlen(sensor[s].internal_name);
 809
 810                         if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
 811                                 /* Switch to new trigger if appropriate */
 812                                 propose_new_trigger(s, name, sensor_name_len);
 813                 }
 814 }
 815
 816
 817 static void setup_trigger_names (void)
 818 {
 819         char filename[PATH_MAX];
 820         char buf[MAX_NAME_SIZE];
 821         int s;
 822         int trigger;
 823         int ret;
 824
 825         /* By default, use the name-dev convention that most drivers use */
 826         for (s=0; s<sensor_count; s++)
 827                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 828
 829         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 830
 831         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 832
 833                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH,trigger);
 834
 835                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 836
 837                 if (ret < 0)
 838                         break;
 839
 840                 /* Record initial and any-motion triggers names */
 841                 update_sensor_matching_trigger_name(buf);
 842         }
 843
 844         /*
 845          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 846          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 847          */
 848
 849         for (s=0; s<sensor_count; s++)
 850                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 851                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 852
 853         for (s=0; s<sensor_count; s++)
 854                 if (sensor[s].mode == MODE_TRIGGER) {
 855                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 856                         if (sensor[s].motion_trigger_name[0])
 857                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 858                 }
 859 }
 860
 861 void enumerate_sensors (void)
 862 {
 863         /*
 864          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
 865          * 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
 866          * and trigger-based sensor, use the trigger usage mode.
 867          */
 868         char poll_sensors[catalog_size];
 869         char trig_sensors[catalog_size];
 870         char event_sensors[catalog_size];
 871         int dev_num;
 872         unsigned int i;
 873         int trig_found;
 874
 875         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
 876                 trig_found = 0;
 877
 878                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
 879                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
 880                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
 881
 882                 for (i=0; i<catalog_size; i++) {
 883                         if (event_sensors[i]) {
 884                                 add_sensor(dev_num, i, MODE_EVENT);
 885                                 continue;
 886                         }
 887                         if (trig_sensors[i]) {
 888                                 add_sensor(dev_num, i, MODE_TRIGGER);
 889                                 trig_found = 1;
 890                                 continue;
 891                         }
 892                         if (poll_sensors[i]) {
 893                                 add_sensor(dev_num, i, MODE_POLL);
 894                                 continue;
 895                         }
 896                 }
 897
 898                 if (trig_found)
 899                         build_sensor_report_maps(dev_num);
 900         }
 901
 902         ALOGI("Discovered %d sensors\n", sensor_count);
 903
 904         /* Set up default - as well as custom - trigger names */
 905         setup_trigger_names();
 906
 907         virtual_sensors_check();
 908 }
 909
 910
 911 void delete_enumeration_data (void)
 912 {
 913         int i;
 914         for (i = 0; i < sensor_count; i++)
 915                 if (sensor[i].cal_data) {
 916                         free(sensor[i].cal_data);
 917                         sensor[i].cal_data = NULL;
 918                         sensor[i].cal_level = 0;
 919                 }
 920
 921         /* Reset sensor count */
 922         sensor_count = 0;
 923 }
 924
 925
 926 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
 927                       struct sensor_t const** list)
 928 {
 929         *list = sensor_desc;
 930         return sensor_count;
 931 }
 932