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 <sys/stat.h>
  11 #include <hardware/sensors.h>
  12 #include "enumeration.h"
  13 #include "description.h"
  14 #include "utils.h"
  15 #include "transform.h"
  16 #include "description.h"
  17 #include "control.h"
  18 #include "calibration.h"
  19
  20 #include <errno.h>
  21
  22 /*
  23  * This table maps syfs entries in scan_elements directories to sensor types,
  24  * and will also be used to determine other sysfs names as well as the iio
  25  * device number associated to a specific sensor.
  26  */
  27
  28  /*
  29   * We duplicate entries for the uncalibrated types after their respective base
  30   * sensor. This is because all sensor entries must have an associated catalog entry
  31   * and also because when only the uncal sensor is active it needs to take it's data
  32   * from the same iio device as the base one.
  33   */
  34
  35 sensor_catalog_entry_t sensor_catalog[] = {
  36         {
  37                 .tag            = "accel",
  38                 .shorthand      = "",
  39                 .type           = SENSOR_TYPE_ACCELEROMETER,
  40                 .num_channels   = 3,
  41                 .is_virtual     = 0,
  42                 .channel = {
  43                         { DECLARE_NAMED_CHANNEL("accel", "x") },
  44                         { DECLARE_NAMED_CHANNEL("accel", "y") },
  45                         { DECLARE_NAMED_CHANNEL("accel", "z") },
  46                 },
  47         },
  48         {
  49                 .tag            = "anglvel",
  50                 .shorthand      = "",
  51                 .type           = SENSOR_TYPE_GYROSCOPE,
  52                 .num_channels   = 3,
  53                 .is_virtual     = 0,
  54                 .channel = {
  55                         { DECLARE_NAMED_CHANNEL("anglvel", "x") },
  56                         { DECLARE_NAMED_CHANNEL("anglvel", "y") },
  57                         { DECLARE_NAMED_CHANNEL("anglvel", "z") },
  58                 },
  59         },
  60         {
  61                 .tag            = "magn",
  62                 .shorthand      = "",
  63                 .type           = SENSOR_TYPE_MAGNETIC_FIELD,
  64                 .num_channels   = 3,
  65                 .is_virtual     = 0,
  66                 .channel = {
  67                         { DECLARE_NAMED_CHANNEL("magn", "x") },
  68                         { DECLARE_NAMED_CHANNEL("magn", "y") },
  69                         { DECLARE_NAMED_CHANNEL("magn", "z") },
  70                 },
  71         },
  72         {
  73                 .tag            = "intensity",
  74                 .shorthand      = "",
  75                 .type           = SENSOR_TYPE_INTERNAL_INTENSITY,
  76                 .num_channels   = 1,
  77                 .is_virtual     = 0,
  78                 .channel = {
  79                         { DECLARE_NAMED_CHANNEL("intensity", "both") },
  80                 },
  81         },
  82         {
  83                 .tag            = "illuminance",
  84                 .shorthand      = "",
  85                 .type           = SENSOR_TYPE_INTERNAL_ILLUMINANCE,
  86                 .num_channels   = 1,
  87                 .is_virtual     = 0,
  88                 .channel = {
  89                         { DECLARE_GENERIC_CHANNEL("illuminance") },
  90                 },
  91         },
  92         {
  93                 .tag            = "incli",
  94                 .shorthand      = "",
  95                 .type           = SENSOR_TYPE_ORIENTATION,
  96                 .num_channels   = 3,
  97                 .is_virtual     = 0,
  98                 .channel = {
  99                         { DECLARE_NAMED_CHANNEL("incli", "x") },
 100                         { DECLARE_NAMED_CHANNEL("incli", "y") },
 101                         { DECLARE_NAMED_CHANNEL("incli", "z") },
 102                 },
 103         },
 104         {
 105                 .tag            = "rot",
 106                 .shorthand      = "",
 107                 .type           = SENSOR_TYPE_ROTATION_VECTOR,
 108                 .num_channels   = 4,
 109                 .is_virtual     = 0,
 110                 .channel = {
 111                         { DECLARE_NAMED_CHANNEL("rot", "quat_x") },
 112                         { DECLARE_NAMED_CHANNEL("rot", "quat_y") },
 113                         { DECLARE_NAMED_CHANNEL("rot", "quat_z") },
 114                         { DECLARE_NAMED_CHANNEL("rot", "quat_w") },
 115                 },
 116         },
 117         {
 118                 .tag            = "temp",
 119                 .shorthand      = "",
 120                 .type           = SENSOR_TYPE_AMBIENT_TEMPERATURE,
 121                 .num_channels   = 1,
 122                 .is_virtual     = 0,
 123                 .channel = {
 124                         { DECLARE_GENERIC_CHANNEL("temp") },
 125                 },
 126         },
 127         {
 128                 .tag            = "proximity",
 129                 .shorthand      = "prox",
 130                 .type           = SENSOR_TYPE_PROXIMITY,
 131                 .num_channels   = 1,
 132                 .is_virtual     = 0,
 133                 .channel = {
 134                         { DECLARE_GENERIC_CHANNEL("proximity") },
 135                 },
 136         },
 137         {
 138                 .tag            = "",
 139                 .shorthand      = "",
 140                 .type           = SENSOR_TYPE_GYROSCOPE_UNCALIBRATED,
 141                 .num_channels   = 0,
 142                 .is_virtual     = 1,
 143                 .channel = {
 144                         { DECLARE_GENERIC_CHANNEL("") },
 145                 },
 146
 147         },
 148         {
 149                 .tag            = "",
 150                 .shorthand      = "",
 151                 .type           = SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
 152                 .num_channels   = 0,
 153                 .is_virtual     = 1,
 154                 .channel = {
 155                         { DECLARE_GENERIC_CHANNEL("") },
 156                 },
 157         },
 158         {
 159                 .tag            = "steps",
 160                 .shorthand      = "",
 161                 .type           = SENSOR_TYPE_STEP_COUNTER,
 162                 .num_channels   = 1,
 163                 .is_virtual     = 0,
 164                 .channel = {
 165                         { DECLARE_GENERIC_CHANNEL("steps") },
 166                 },
 167         },
 168         {
 169                 .tag            = "steps",
 170                 .shorthand      = "",
 171                 .type           = SENSOR_TYPE_STEP_DETECTOR,
 172                 .num_channels   = 1,
 173                 .is_virtual     = 0,
 174                 .channel = {
 175                         {
 176                                 DECLARE_VOID_CHANNEL("steps")
 177                                 .num_events = 1,
 178                                 .event = {
 179                                         { DECLARE_NAMED_EVENT("steps", "change") },
 180                                 },
 181                         },
 182                 },
 183         },
 184         {
 185                 .tag            = "proximity",
 186                 .shorthand      = "prox",
 187                 .type           = SENSOR_TYPE_PROXIMITY,
 188                 .num_channels   = 4,
 189                 .is_virtual     = 0,
 190                 .channel = {
 191                         {
 192                                 DECLARE_VOID_CHANNEL("proximity0")
 193                                 .num_events = 1,
 194                                 .event = {
 195                                         { DECLARE_EVENT("proximity0", "_", "", "", "thresh", "_", "either") },
 196                                 },
 197                         },
 198                         {
 199                                 DECLARE_VOID_CHANNEL("proximity1")
 200                                 .num_events = 1,
 201                                 .event = {
 202                                         { DECLARE_EVENT("proximity1", "_", "", "", "thresh", "_", "either") },
 203                                 },
 204                         },
 205                         {
 206                                 DECLARE_VOID_CHANNEL("proximity2")
 207                                 .num_events = 1,
 208                                 .event = {
 209                                         { DECLARE_EVENT("proximity2", "_", "", "", "thresh", "_", "either") },
 210                                 },
 211                         },
 212                         {
 213                                 DECLARE_VOID_CHANNEL("proximity3")
 214                                 .num_events = 1,
 215                                 .event = {
 216                                         { DECLARE_EVENT("proximity3", "_", "", "", "thresh", "_", "either") },
 217                                 },
 218                         },
 219                 },
 220         },
 221 };
 222
 223 unsigned int catalog_size = ARRAY_SIZE(sensor_catalog);
 224
 225 /* ACPI PLD (physical location of device) definitions, as used with sensors */
 226
 227 #define PANEL_FRONT     4
 228 #define PANEL_BACK      5
 229
 230 /* Buffer default length */
 231 #define BUFFER_LENGTH   16
 232
 233 /* We equate sensor handles to indices in these tables */
 234
 235 struct sensor_t sensor_desc[MAX_SENSORS];       /* Android-level descriptors */
 236 sensor_info_t   sensor[MAX_SENSORS];            /* Internal descriptors      */
 237 int             sensor_count;                   /* Detected sensors          */
 238
 239
 240 /* if the sensor has an _en attribute, we need to enable it */
 241 int get_needs_enable(int dev_num, const char *tag)
 242 {
 243         char sysfs_path[PATH_MAX];
 244         int fd;
 245
 246         sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
 247
 248         fd = open(sysfs_path, O_RDWR);
 249         if (fd == -1)
 250                 return 0;
 251
 252         close(fd);
 253         return 1;
 254 }
 255
 256 static void setup_properties_from_pld (int s, int panel, int rotation,
 257                                        int num_channels)
 258 {
 259         /*
 260          * Generate suitable order and opt_scale directives from the PLD panel
 261          * and rotation codes we got. This can later be superseded by the usual
 262          * properties if necessary. Eventually we'll need to replace these
 263          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
 264          */
 265
 266         int x = 1;
 267         int y = 1;
 268         int z = 1;
 269         int xy_swap = 0;
 270         int angle = rotation * 45;
 271
 272         /* Only deal with 3 axis chips for now */
 273         if (num_channels < 3)
 274                 return;
 275
 276         if (panel == PANEL_BACK) {
 277                 /* Chip placed on the back panel ; negate x and z */
 278                 x = -x;
 279                 z = -z;
 280         }
 281
 282         switch (angle) {
 283                 case 90: /* 90° clockwise: negate y then swap x,y */
 284                         xy_swap = 1;
 285                         y = -y;
 286                         break;
 287
 288                 case 180: /* Upside down: negate x and y */
 289                         x = -x;
 290                         y = -y;
 291                         break;
 292
 293                 case 270: /* 90° counter clockwise: negate x then swap x,y */
 294                         x = -x;
 295                         xy_swap = 1;
 296                         break;
 297         }
 298
 299         if (xy_swap) {
 300                 sensor[s].order[0] = 1;
 301                 sensor[s].order[1] = 0;
 302                 sensor[s].order[2] = 2;
 303                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 304         }
 305
 306         sensor[s].channel[0].opt_scale = x;
 307         sensor[s].channel[1].opt_scale = y;
 308         sensor[s].channel[2].opt_scale = z;
 309 }
 310
 311
 312 static int is_valid_pld (int panel, int rotation)
 313 {
 314         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 315                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 316                 return 0;
 317         }
 318
 319         /* Only deal with 90° rotations for now */
 320         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 321                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 322                 return 0;
 323         }
 324
 325         return 1;
 326 }
 327
 328
 329 static int read_pld_from_properties (int s, int* panel, int* rotation)
 330 {
 331         int p, r;
 332
 333         if (sensor_get_prop(s, "panel", &p))
 334                 return -1;
 335
 336         if (sensor_get_prop(s, "rotation", &r))
 337                 return -1;
 338
 339         if (!is_valid_pld(p, r))
 340                 return -1;
 341
 342         *panel = p;
 343         *rotation = r;
 344
 345         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 346
 347         return 0;
 348 }
 349
 350
 351 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 352 {
 353         char sysfs_path[PATH_MAX];
 354         int p,r;
 355
 356         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 357
 358         if (sysfs_read_int(sysfs_path, &p))
 359                 return -1;
 360
 361         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 362
 363         if (sysfs_read_int(sysfs_path, &r))
 364                 return -1;
 365
 366         if (!is_valid_pld(p, r))
 367                 return -1;
 368
 369         *panel = p;
 370         *rotation = r;
 371
 372         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 373
 374         return 0;
 375 }
 376
 377
 378 static void decode_placement_information (int dev_num, int num_channels, int s)
 379 {
 380         /*
 381          * See if we have optional "physical location of device" ACPI tags.
 382          * We're only interested in panel and rotation specifiers. Use the
 383          * .panel and .rotation properties in priority, and the actual ACPI
 384          * values as a second source.
 385          */
 386
 387         int panel;
 388         int rotation;
 389
 390         if (read_pld_from_properties(s, &panel, &rotation) &&
 391                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 392                         return; /* No PLD data available */
 393
 394         /* Map that to field ordering and scaling mechanisms */
 395         setup_properties_from_pld(s, panel, rotation, num_channels);
 396 }
 397
 398
 399 static int map_internal_to_external_type (int sensor_type)
 400 {
 401         /* Most sensors are internally identified using the Android type, but for some we use a different type specification internally */
 402
 403         switch (sensor_type) {
 404                 case SENSOR_TYPE_INTERNAL_ILLUMINANCE:
 405                 case SENSOR_TYPE_INTERNAL_INTENSITY:
 406                         return SENSOR_TYPE_LIGHT;
 407
 408                 default:
 409                         return sensor_type;
 410         }
 411 }
 412
 413 static void populate_descriptors (int s, int sensor_type)
 414 {
 415         int32_t         min_delay_us;
 416         max_delay_t     max_delay_us;
 417
 418         /* Initialize Android-visible descriptor */
 419         sensor_desc[s].name             = sensor_get_name(s);
 420         sensor_desc[s].vendor           = sensor_get_vendor(s);
 421         sensor_desc[s].version          = sensor_get_version(s);
 422         sensor_desc[s].handle           = s;
 423         sensor_desc[s].type             = map_internal_to_external_type(sensor_type);
 424
 425         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 426         sensor_desc[s].resolution       = sensor_get_resolution(s);
 427         sensor_desc[s].power            = sensor_get_power(s);
 428         sensor_desc[s].stringType       = sensor_get_string_type(s);
 429
 430         /* None of our supported sensors requires a special permission */
 431         sensor_desc[s].requiredPermission = "";
 432
 433         sensor_desc[s].flags = sensor_get_flags(s);
 434         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 435         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 436
 437         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 438                 s, sensor[s].friendly_name, sensor_desc[s].type,
 439                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 440                 sensor_desc[s].flags);
 441
 442         /* We currently do not implement batching */
 443         sensor_desc[s].fifoReservedEventCount = 0;
 444         sensor_desc[s].fifoMaxEventCount = 0;
 445
 446         min_delay_us = sensor_desc[s].minDelay;
 447         max_delay_us = sensor_desc[s].maxDelay;
 448
 449         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 450         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 451 }
 452
 453
 454 static void add_virtual_sensor (int catalog_index)
 455 {
 456         int s;
 457         int sensor_type;
 458
 459         if (sensor_count == MAX_SENSORS) {
 460                 ALOGE("Too many sensors!\n");
 461                 return;
 462         }
 463
 464         sensor_type = sensor_catalog[catalog_index].type;
 465
 466         s = sensor_count;
 467
 468         sensor[s].is_virtual = 1;
 469         sensor[s].catalog_index = catalog_index;
 470         sensor[s].type          = sensor_type;
 471
 472         populate_descriptors(s, sensor_type);
 473
 474         /* Initialize fields related to sysfs reads offloading */
 475         sensor[s].thread_data_fd[0]  = -1;
 476         sensor[s].thread_data_fd[1]  = -1;
 477         sensor[s].acquisition_thread = -1;
 478
 479         sensor_count++;
 480 }
 481
 482
 483 static int add_sensor (int dev_num, int catalog_index, int mode)
 484 {
 485         int s;
 486         int sensor_type;
 487         int retval;
 488         char sysfs_path[PATH_MAX];
 489         const char* prefix;
 490         float scale;
 491         int c;
 492         float opt_scale;
 493         const char* ch_name;
 494         int num_channels;
 495         char suffix[MAX_NAME_SIZE + 8];
 496         int calib_bias;
 497         int buffer_length;
 498
 499         if (sensor_count == MAX_SENSORS) {
 500                 ALOGE("Too many sensors!\n");
 501                 return -1;
 502         }
 503
 504         sensor_type = sensor_catalog[catalog_index].type;
 505
 506         /*
 507          * At this point we could check that the expected sysfs attributes are
 508          * present ; that would enable having multiple catalog entries with the
 509          * same sensor type, accomodating different sets of sysfs attributes.
 510          */
 511
 512         s = sensor_count;
 513
 514         sensor[s].dev_num       = dev_num;
 515         sensor[s].catalog_index = catalog_index;
 516         sensor[s].type          = sensor_type;
 517         sensor[s].mode          = mode;
 518         sensor[s].trigger_nr = -1;      /* -1 means no trigger - we'll populate these at a later time */
 519
 520         num_channels = sensor_catalog[catalog_index].num_channels;
 521
 522         if (mode == MODE_POLL)
 523                 sensor[s].num_channels = 0;
 524         else
 525                 sensor[s].num_channels = num_channels;
 526
 527         /* Populate the quirks array */
 528         sensor_get_quirks(s);
 529
 530         /* Reject interfaces that may have been disabled through a quirk for this driver */
 531         if ((mode == MODE_EVENT   && (sensor[s].quirks & QUIRK_NO_EVENT_MODE)) ||
 532             (mode == MODE_TRIGGER && (sensor[s].quirks & QUIRK_NO_TRIG_MODE )) ||
 533             (mode == MODE_POLL    && (sensor[s].quirks & QUIRK_NO_POLL_MODE ))) {
 534                 memset(&sensor[s], 0, sizeof(sensor[0]));
 535                 return -1;
 536         }
 537
 538         prefix = sensor_catalog[catalog_index].tag;
 539
 540         /*
 541          * receiving the illumination sensor calibration inputs from
 542          * the Android properties and setting it within sysfs
 543          */
 544         if (sensor_type == SENSOR_TYPE_INTERNAL_ILLUMINANCE) {
 545                 retval = sensor_get_illumincalib(s);
 546                 if (retval > 0) {
 547                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 548                         sysfs_write_int(sysfs_path, retval);
 549                 }
 550         }
 551
 552         /*
 553          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 554          * 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
 555          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 556          */
 557
 558         if (num_channels) {
 559                 for (c = 0; c < num_channels; c++) {
 560                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 561                         sprintf(suffix, "%s.calib_bias", ch_name);
 562                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 563                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 564                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 565                                 sysfs_write_int(sysfs_path, calib_bias);
 566                         }
 567                 }
 568         } else
 569                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 570                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 571                                 sysfs_write_int(sysfs_path, calib_bias);
 572                         }
 573
 574         /* Change buffer length according to the property or use default value */
 575         if (mode == MODE_TRIGGER) {
 576                 if (sensor_get_prop(s, "buffer_length", &buffer_length)) {
 577                         buffer_length = BUFFER_LENGTH;
 578                 }
 579
 580                 sprintf(sysfs_path, BUFFER_LENGTH_PATH, dev_num);
 581
 582                 if (sysfs_write_int(sysfs_path, buffer_length) <= 0) {
 583                         ALOGE("Failed to set buffer length on dev%d", dev_num);
 584                 }
 585         }
 586
 587         /* Read name attribute, if available */
 588         sprintf(sysfs_path, NAME_PATH, dev_num);
 589         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 590
 591         /* See if we have general offsets and scale values for this sensor */
 592
 593         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 594         sysfs_read_float(sysfs_path, &sensor[s].offset);
 595
 596         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 597         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 598                 /*
 599                  * There is a chip preferred scale specified,
 600                  * so try to store it in sensor's scale file
 601                  */
 602                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 603                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 604                         /* Store failed, try to store the scale into channel specific file */
 605                         for (c = 0; c < num_channels; c++)
 606                         {
 607                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 608                                         sensor_catalog[catalog_index].channel[c].scale_path);
 609                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 610                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 611                         }
 612                 }
 613         }
 614
 615         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 616         if (!sysfs_read_float(sysfs_path, &scale)) {
 617                 sensor[s].scale = scale;
 618                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 619                                         sysfs_path, scale, dev_num);
 620         } else {
 621                 sensor[s].scale = 1;
 622
 623                 /* Read channel specific scale if any*/
 624                 for (c = 0; c < num_channels; c++)
 625                 {
 626                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 627                            sensor_catalog[catalog_index].channel[c].scale_path);
 628
 629                         if (!sysfs_read_float(sysfs_path, &scale)) {
 630                                 sensor[s].channel[c].scale = scale;
 631                                 sensor[s].scale = 0;
 632
 633                                 ALOGV(  "Scale path:%s "
 634                                         "channel scale:%g dev_num:%d\n",
 635                                         sysfs_path, scale, dev_num);
 636                         }
 637                 }
 638         }
 639
 640         /* Set default scaling - if num_channels is zero, we have one channel */
 641
 642         sensor[s].channel[0].opt_scale = 1;
 643
 644         for (c = 1; c < num_channels; c++)
 645                 sensor[s].channel[c].opt_scale = 1;
 646
 647         for (c = 0; c < num_channels; c++) {
 648                 /* Check the presence of the channel's input_path */
 649                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 650                         sensor_catalog[catalog_index].channel[c].input_path);
 651                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 652                 /* Check the presence of the channel's raw_path */
 653                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 654                         sensor_catalog[catalog_index].channel[c].raw_path);
 655                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 656         }
 657
 658         if (sensor_get_mounting_matrix(s, sensor[s].mounting_matrix))
 659                 sensor[s].quirks |= QUIRK_MOUNTING_MATRIX;
 660         else
 661                 /* Read ACPI _PLD attributes for this sensor, if there are any */
 662                 decode_placement_information(dev_num, num_channels, s);
 663
 664         /*
 665          * See if we have optional correction scaling factors for each of the
 666          * channels of this sensor. These would be expressed using properties
 667          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 668          * support things such as iio.temp.opt_scale = -1. Note that this works
 669          * for all types of sensors, and whatever transform is selected, on top
 670          * of any previous conversions.
 671          */
 672
 673         if (num_channels) {
 674                 for (c = 0; c < num_channels; c++) {
 675                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 676                         sprintf(suffix, "%s.opt_scale", ch_name);
 677                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 678                                 sensor[s].channel[c].opt_scale = opt_scale;
 679                 }
 680         } else {
 681                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 682                         sensor[s].channel[0].opt_scale = opt_scale;
 683         }
 684
 685         populate_descriptors(s, sensor_type);
 686
 687         if (sensor[s].internal_name[0] == '\0') {
 688                 /*
 689                  * In case the kernel-mode driver doesn't expose a name for
 690                  * the iio device, use (null)-dev%d as the trigger name...
 691                  * This can be considered a kernel-mode iio driver bug.
 692                  */
 693                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 694                 strcpy(sensor[s].internal_name, "(null)");
 695         }
 696
 697         switch (sensor_type) {
 698                 case SENSOR_TYPE_ACCELEROMETER:
 699                         /* Only engage accelerometer bias compensation if really needed */
 700                         if (sensor_get_quirks(s) & QUIRK_BIASED)
 701                                 sensor[s].cal_data = calloc(1, sizeof(accel_cal_t));
 702                         break;
 703
 704                         case SENSOR_TYPE_GYROSCOPE:
 705                         sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
 706                         break;
 707
 708                 case SENSOR_TYPE_MAGNETIC_FIELD:
 709                         sensor[s].cal_data = malloc(sizeof(compass_cal_t));
 710                         break;
 711         }
 712
 713         sensor[s].max_cal_level = sensor_get_cal_steps(s);
 714
 715         /* Select one of the available sensor sample processing styles */
 716         select_transform(s);
 717
 718         /* Initialize fields related to sysfs reads offloading */
 719         sensor[s].thread_data_fd[0]  = -1;
 720         sensor[s].thread_data_fd[1]  = -1;
 721         sensor[s].acquisition_thread = -1;
 722
 723         /* Check if we have a special ordering property on this sensor */
 724         if (sensor_get_order(s, sensor[s].order))
 725                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 726
 727         sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
 728
 729         sensor_count++;
 730         return 0;
 731 }
 732
 733 static void virtual_sensors_check (void)
 734 {
 735         int i;
 736         int has_acc = 0;
 737         int has_gyr = 0;
 738         int has_mag = 0;
 739         int has_rot = 0;
 740         int has_ori = 0;
 741         int gyro_cal_idx = 0;
 742         int magn_cal_idx = 0;
 743         unsigned int j;
 744
 745         for (i=0; i<sensor_count; i++)
 746                 switch (sensor[i].type) {
 747                         case SENSOR_TYPE_ACCELEROMETER:
 748                                 has_acc = 1;
 749                                 break;
 750                         case SENSOR_TYPE_GYROSCOPE:
 751                                 has_gyr = 1;
 752                                 gyro_cal_idx = i;
 753                                 break;
 754                         case SENSOR_TYPE_MAGNETIC_FIELD:
 755                                 has_mag = 1;
 756                                 magn_cal_idx = i;
 757                                 break;
 758                         case SENSOR_TYPE_ORIENTATION:
 759                                 has_ori = 1;
 760                                 break;
 761                         case SENSOR_TYPE_ROTATION_VECTOR:
 762                                 has_rot = 1;
 763                                 break;
 764                 }
 765
 766         for (j=0; j<catalog_size; j++)
 767                 switch (sensor_catalog[j].type) {
 768                         /*
 769                          * If we have accel + gyro + magn but no rotation vector sensor,
 770                          * SensorService replaces the HAL provided orientation sensor by the
 771                          * AOSP version... provided we report one. So initialize a virtual
 772                          * orientation sensor with zero values, which will get replaced. See:
 773                          * frameworks/native/services/sensorservice/SensorService.cpp, looking
 774                          * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 775                          * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 776                          */
 777
 778                         case SENSOR_TYPE_ORIENTATION:
 779                                 if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 780                                         add_sensor(0, j, MODE_POLL);
 781                                 break;
 782                         case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 783                                 if (has_gyr) {
 784                                         sensor[sensor_count].base_count = 1;
 785                                         sensor[sensor_count].base[0] = gyro_cal_idx;
 786                                         add_virtual_sensor(j);
 787                                 }
 788                                 break;
 789                         case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
 790                                 if (has_mag) {
 791                                         sensor[sensor_count].base_count = 1;
 792                                         sensor[sensor_count].base[0] = magn_cal_idx;
 793                                         add_virtual_sensor(j);
 794                                 }
 795                                 break;
 796                         default:
 797                                 break;
 798                 }
 799 }
 800
 801
 802 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 803                                  int sensor_name_len)
 804 {
 805         /*
 806          * A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
 807          *  and select it if it is so. The format is something like sensor_name-dev0.
 808          */
 809
 810         const char *suffix = trigger_name + sensor_name_len + 1;
 811
 812         /* dev is the default, and lowest priority; no need to update */
 813         if (!memcmp(suffix, "dev", 3))
 814                 return;
 815
 816         /* If we found any-motion trigger, record it */
 817
 818         if (!memcmp(suffix, "any-motion-", 11)) {
 819                 strcpy(sensor[s].motion_trigger_name, trigger_name);
 820                 return;
 821         }
 822
 823         /* If we found a hrtimer trigger, record it */
 824         if (!memcmp(suffix, "hr-dev", 6)) {
 825                 strcpy(sensor[s].hrtimer_trigger_name, trigger_name);
 826                 return;
 827         }
 828         /*
 829          * 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
 830          * of the trigger to use with this sensor.
 831          */
 832         strcpy(sensor[s].init_trigger_name, trigger_name);
 833 }
 834
 835
 836 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE], int* updated, int trigger)
 837 {
 838         /*
 839          * Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
 840          * 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
 841          * when enabling this sensor.
 842          */
 843
 844         int s;
 845         int dev_num;
 846         int len;
 847         char* cursor;
 848         int sensor_name_len;
 849
 850         /*
 851          * First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
 852          * to be this number, so perform a few checks.
 853          */
 854         len = strnlen(name, MAX_NAME_SIZE);
 855
 856         if (len < 2)
 857                 return;
 858
 859         cursor = name + len - 1;
 860
 861         if (!isdigit(*cursor))
 862                 return;
 863
 864         while (len && isdigit(*cursor)) {
 865                 len--;
 866                 cursor--;
 867         }
 868
 869         dev_num = atoi(cursor+1);
 870
 871         /* See if that matches a sensor */
 872         for (s=0; s<sensor_count; s++)
 873                 if (sensor[s].dev_num == dev_num) {
 874
 875                         sensor_name_len = strlen(sensor[s].internal_name);
 876
 877                         if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
 878                                 /* Switch to new trigger if appropriate */
 879                                 propose_new_trigger(s, name, sensor_name_len);
 880                                 updated[s] = 1;
 881                                 sensor[s].trigger_nr = trigger;
 882                 }
 883 }
 884
 885 static int create_hrtimer_trigger(int s, int trigger)
 886 {
 887         struct stat dir_status;
 888         char buf[MAX_NAME_SIZE];
 889         char hrtimer_path[PATH_MAX];
 890         char hrtimer_name[MAX_NAME_SIZE];
 891
 892         snprintf(buf, MAX_NAME_SIZE, "hrtimer-%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 893         snprintf(hrtimer_name, MAX_NAME_SIZE, "%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 894         snprintf(hrtimer_path, PATH_MAX, "%s%s", CONFIGFS_TRIGGER_PATH, buf);
 895
 896         /* Get parent dir status */
 897         if (stat(CONFIGFS_TRIGGER_PATH, &dir_status))
 898                 return -1;
 899
 900         /* Create hrtimer with the same access rights as it's parent */
 901         if (mkdir(hrtimer_path, dir_status.st_mode))
 902                 if (errno != EEXIST)
 903                         return -1;
 904
 905         strncpy (sensor[s].hrtimer_trigger_name, hrtimer_name, MAX_NAME_SIZE);
 906         sensor[s].trigger_nr = trigger;
 907         return 0;
 908 }
 909
 910 static void setup_trigger_names (void)
 911 {
 912         char filename[PATH_MAX];
 913         char buf[MAX_NAME_SIZE];
 914         int s;
 915         int trigger;
 916         int ret;
 917         int updated[MAX_SENSORS] = {0};
 918
 919         /* By default, use the name-dev convention that most drivers use */
 920         for (s=0; s<sensor_count; s++)
 921                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 922
 923         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 924
 925         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 926
 927                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH, trigger);
 928
 929                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 930
 931                 if (ret < 0)
 932                         break;
 933
 934                 /* Record initial and any-motion triggers names */
 935                 update_sensor_matching_trigger_name(buf, updated, trigger);
 936         }
 937
 938
 939         /* If we don't have any other trigger exposed and quirk hrtimer is set setup the hrtimer name here  - and create it also */
 940         for (s=0; s<sensor_count && trigger<MAX_TRIGGERS; s++) {
 941                 if ((sensor[s].quirks & QUIRK_HRTIMER) && !updated[s]) {
 942                         create_hrtimer_trigger(s, trigger);
 943                         trigger++;
 944                 }
 945         }
 946
 947         /*
 948          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 949          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 950          */
 951
 952         for (s=0; s<sensor_count; s++)
 953                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 954                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 955
 956         for (s=0; s<sensor_count; s++)
 957                 if (sensor[s].mode == MODE_TRIGGER) {
 958                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 959                         if (sensor[s].motion_trigger_name[0])
 960                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 961                         if (sensor[s].hrtimer_trigger_name[0])
 962                                 ALOGI("Sensor %d (%s) hrtimer trigger: %s\n", s, sensor[s].friendly_name, sensor[s].hrtimer_trigger_name);
 963                 }
 964 }
 965
 966
 967 static int catalog_index_from_sensor_type (int type)
 968 {
 969         /* Return first matching catalog entry index for selected type */
 970         unsigned int i;
 971
 972         for (i=0; i<catalog_size; i++)
 973                 if (sensor_catalog[i].type == type)
 974                         return i;
 975
 976         return -1;
 977 }
 978
 979
 980 static void post_process_sensor_list (char poll_map[catalog_size], char trig_map[catalog_size], char event_map[catalog_size])
 981 {
 982         int illuminance_cat_index = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_ILLUMINANCE);
 983         int intensity_cat_index   = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_INTENSITY);
 984         int illuminance_found     = poll_map[illuminance_cat_index] || trig_map[illuminance_cat_index] || event_map[illuminance_cat_index];
 985
 986         /* If an illumimance sensor has been reported */
 987         if (illuminance_found) {
 988                 /* Hide any intensity sensors we can have for the same iio device */
 989                 poll_map [intensity_cat_index     ] = 0;
 990                 trig_map [intensity_cat_index     ] = 0;
 991                 event_map[intensity_cat_index     ] = 0;
 992                 return;
 993         }
 994 }
 995
 996
 997 static void swap_sensors (int s1, int s2)
 998 {
 999         struct sensor_t temp_sensor_desc;
1000         sensor_info_t   temp_sensor;
1001
1002         /* S1 -> temp */
1003         memcpy(&temp_sensor, &sensor[s1], sizeof(sensor_info_t));
1004         memcpy(&temp_sensor_desc, &sensor_desc[s1], sizeof(struct sensor_t));
1005
1006         /* S2 -> S1 */
1007         memcpy(&sensor[s1], &sensor[s2], sizeof(sensor_info_t));
1008         memcpy(&sensor_desc[s1], &sensor_desc[s2], sizeof(struct sensor_t));
1009
1010         /* temp -> S2 */
1011         memcpy(&sensor[s2], &temp_sensor, sizeof(sensor_info_t));
1012         memcpy(&sensor_desc[s2], &temp_sensor_desc,  sizeof(struct sensor_t));
1013
1014         /* Fix-up sensor id mapping, which is stale */
1015         sensor_desc[s1].handle  = s1;
1016         sensor_desc[s2].handle  = s2;
1017
1018         /* Fix up name and vendor buffer pointers, which are potentially stale pointers */
1019         sensor_desc[s1].name            = sensor_get_name(s1);
1020         sensor_desc[s1].vendor          = sensor_get_vendor(s1);
1021         sensor_desc[s2].name            = sensor_get_name(s2);
1022         sensor_desc[s2].vendor          = sensor_get_vendor(s2);
1023 }
1024
1025
1026 static void reorder_sensors (void)
1027 {
1028         /* Some sensors may be marked as secondary - these need to be listed after other sensors of the same type */
1029         int s1, s2;
1030
1031         for (s1=0; s1<sensor_count-1; s1++)
1032                 if (sensor[s1].quirks & QUIRK_SECONDARY) {
1033                         /* Search for subsequent sensors of same type */
1034                         for (s2 = s1+1; s2<sensor_count; s2++)
1035                                 if (sensor[s2].type == sensor[s1].type && !(sensor[s2].quirks & QUIRK_SECONDARY)) {
1036                                         ALOGI("Sensor S%d has higher priority than S%d, swapping\n", s2, s1);
1037                                         swap_sensors(s1, s2);
1038                                         break;
1039                                 }
1040                 }
1041 }
1042
1043
1044 void enumerate_sensors (void)
1045 {
1046         /*
1047          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
1048          * 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
1049          * and trigger-based sensor, use the trigger usage mode.
1050          */
1051         char poll_sensors[catalog_size];
1052         char trig_sensors[catalog_size];
1053         char event_sensors[catalog_size];
1054         int dev_num;
1055         unsigned int i;
1056         int trig_found;
1057         int s;
1058
1059         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
1060                 trig_found = 0;
1061
1062                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
1063                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
1064                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
1065
1066                 /* Hide specific sensor types if appropriate */
1067                 post_process_sensor_list(poll_sensors, trig_sensors, event_sensors);
1068
1069                 for (i=0; i<catalog_size; i++) {
1070                         /* Try using events interface */
1071                         if (event_sensors[i] && !add_sensor(dev_num, i, MODE_EVENT))
1072                                 continue;
1073
1074                         /* Then trigger */
1075                         if (trig_sensors[i] && !add_sensor(dev_num, i, MODE_TRIGGER)) {
1076                                 trig_found = 1;
1077                                 continue;
1078                         }
1079
1080                         /* Try polling otherwise */
1081                         if (poll_sensors[i])
1082                                 add_sensor(dev_num, i, MODE_POLL);
1083                 }
1084
1085                 if (trig_found)
1086                         build_sensor_report_maps(dev_num);
1087         }
1088
1089         /* Make sure secondary sensors appear after primary ones */
1090         reorder_sensors();
1091
1092         ALOGI("Discovered %d sensors\n", sensor_count);
1093
1094         /* Set up default - as well as custom - trigger names */
1095         setup_trigger_names();
1096
1097         ALOGI("Discovered %d sensors\n", sensor_count);
1098
1099         virtual_sensors_check();
1100
1101         for (s=0; s<sensor_count; s++) {
1102                 ALOGI("S%d: %s\n", s, sensor[s].friendly_name);
1103         }
1104 }
1105
1106
1107 void delete_enumeration_data (void)
1108 {
1109         int i;
1110         for (i = 0; i < sensor_count; i++)
1111                 if (sensor[i].cal_data) {
1112                         free(sensor[i].cal_data);
1113                         sensor[i].cal_data = NULL;
1114                         sensor[i].cal_level = 0;
1115                 }
1116
1117         /* Reset sensor count */
1118         sensor_count = 0;
1119 }
1120
1121
1122 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
1123                       struct sensor_t const** list)
1124 {
1125         *list = sensor_desc;
1126         return sensor_count;
1127 }
1128