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 /*
  21  * This table maps syfs entries in scan_elements directories to sensor types,
  22  * and will also be used to determine other sysfs names as well as the iio
  23  * device number associated to a specific sensor.
  24  */
  25
  26  /*
  27   * We duplicate entries for the uncalibrated types after their respective base
  28   * sensor. This is because all sensor entries must have an associated catalog entry
  29   * and also because when only the uncal sensor is active it needs to take it's data
  30   * from the same iio device as the base one.
  31   */
  32
  33 sensor_catalog_entry_t sensor_catalog[] = {
  34         {
  35                 .tag            = "accel",
  36                 .shorthand      = "",
  37                 .type           = SENSOR_TYPE_ACCELEROMETER,
  38                 .num_channels   = 3,
  39                 .is_virtual     = 0,
  40                 .channel = {
  41                         { DECLARE_NAMED_CHANNEL("accel", "x") },
  42                         { DECLARE_NAMED_CHANNEL("accel", "y") },
  43                         { DECLARE_NAMED_CHANNEL("accel", "z") },
  44                 },
  45         },
  46         {
  47                 .tag            = "anglvel",
  48                 .shorthand      = "",
  49                 .type           = SENSOR_TYPE_GYROSCOPE,
  50                 .num_channels   = 3,
  51                 .is_virtual     = 0,
  52                 .channel = {
  53                         { DECLARE_NAMED_CHANNEL("anglvel", "x") },
  54                         { DECLARE_NAMED_CHANNEL("anglvel", "y") },
  55                         { DECLARE_NAMED_CHANNEL("anglvel", "z") },
  56                 },
  57         },
  58         {
  59                 .tag            = "magn",
  60                 .shorthand      = "",
  61                 .type           = SENSOR_TYPE_MAGNETIC_FIELD,
  62                 .num_channels   = 3,
  63                 .is_virtual     = 0,
  64                 .channel = {
  65                         { DECLARE_NAMED_CHANNEL("magn", "x") },
  66                         { DECLARE_NAMED_CHANNEL("magn", "y") },
  67                         { DECLARE_NAMED_CHANNEL("magn", "z") },
  68                 },
  69         },
  70         {
  71                 .tag            = "intensity",
  72                 .shorthand      = "",
  73                 .type           = SENSOR_TYPE_INTERNAL_INTENSITY,
  74                 .num_channels   = 1,
  75                 .is_virtual     = 0,
  76                 .channel = {
  77                         { DECLARE_NAMED_CHANNEL("intensity", "both") },
  78                 },
  79         },
  80         {
  81                 .tag            = "illuminance",
  82                 .shorthand      = "",
  83                 .type           = SENSOR_TYPE_INTERNAL_ILLUMINANCE,
  84                 .num_channels   = 1,
  85                 .is_virtual     = 0,
  86                 .channel = {
  87                         { DECLARE_GENERIC_CHANNEL("illuminance") },
  88                 },
  89         },
  90         {
  91                 .tag            = "incli",
  92                 .shorthand      = "",
  93                 .type           = SENSOR_TYPE_ORIENTATION,
  94                 .num_channels   = 3,
  95                 .is_virtual     = 0,
  96                 .channel = {
  97                         { DECLARE_NAMED_CHANNEL("incli", "x") },
  98                         { DECLARE_NAMED_CHANNEL("incli", "y") },
  99                         { DECLARE_NAMED_CHANNEL("incli", "z") },
 100                 },
 101         },
 102         {
 103                 .tag            = "rot",
 104                 .shorthand      = "",
 105                 .type           = SENSOR_TYPE_ROTATION_VECTOR,
 106                 .num_channels   = 4,
 107                 .is_virtual     = 0,
 108                 .channel = {
 109                         { DECLARE_NAMED_CHANNEL("rot", "quat_x") },
 110                         { DECLARE_NAMED_CHANNEL("rot", "quat_y") },
 111                         { DECLARE_NAMED_CHANNEL("rot", "quat_z") },
 112                         { DECLARE_NAMED_CHANNEL("rot", "quat_w") },
 113                 },
 114         },
 115         {
 116                 .tag            = "temp",
 117                 .shorthand      = "",
 118                 .type           = SENSOR_TYPE_AMBIENT_TEMPERATURE,
 119                 .num_channels   = 1,
 120                 .is_virtual     = 0,
 121                 .channel = {
 122                         { DECLARE_GENERIC_CHANNEL("temp") },
 123                 },
 124         },
 125         {
 126                 .tag            = "proximity",
 127                 .shorthand      = "prox",
 128                 .type           = SENSOR_TYPE_PROXIMITY,
 129                 .num_channels   = 1,
 130                 .is_virtual     = 0,
 131                 .channel = {
 132                         { DECLARE_GENERIC_CHANNEL("proximity") },
 133                 },
 134         },
 135         {
 136                 .tag            = "",
 137                 .shorthand      = "",
 138                 .type           = SENSOR_TYPE_GYROSCOPE_UNCALIBRATED,
 139                 .num_channels   = 0,
 140                 .is_virtual     = 1,
 141                 .channel = {
 142                         { DECLARE_GENERIC_CHANNEL("") },
 143                 },
 144
 145         },
 146         {
 147                 .tag            = "",
 148                 .shorthand      = "",
 149                 .type           = SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
 150                 .num_channels   = 0,
 151                 .is_virtual     = 1,
 152                 .channel = {
 153                         { DECLARE_GENERIC_CHANNEL("") },
 154                 },
 155         },
 156         {
 157                 .tag            = "steps",
 158                 .shorthand      = "",
 159                 .type           = SENSOR_TYPE_STEP_COUNTER,
 160                 .num_channels   = 1,
 161                 .is_virtual     = 0,
 162                 .channel = {
 163                         { DECLARE_GENERIC_CHANNEL("steps") },
 164                 },
 165         },
 166         {
 167                 .tag            = "steps",
 168                 .shorthand      = "",
 169                 .type           = SENSOR_TYPE_STEP_DETECTOR,
 170                 .num_channels   = 1,
 171                 .is_virtual     = 0,
 172                 .channel = {
 173                         {
 174                                 DECLARE_VOID_CHANNEL("steps")
 175                                 .num_events = 1,
 176                                 .event = {
 177                                         { DECLARE_NAMED_EVENT("steps", "change") },
 178                                 },
 179                         },
 180                 },
 181         },
 182         {
 183                 .tag            = "proximity",
 184                 .shorthand      = "prox",
 185                 .type           = SENSOR_TYPE_PROXIMITY,
 186                 .num_channels   = 4,
 187                 .is_virtual     = 0,
 188                 .channel = {
 189                         {
 190                                 DECLARE_VOID_CHANNEL("proximity0")
 191                                 .num_events = 1,
 192                                 .event = {
 193                                         { DECLARE_EVENT("proximity0", "_", "", "", "thresh", "_", "either") },
 194                                 },
 195                         },
 196                         {
 197                                 DECLARE_VOID_CHANNEL("proximity1")
 198                                 .num_events = 1,
 199                                 .event = {
 200                                         { DECLARE_EVENT("proximity1", "_", "", "", "thresh", "_", "either") },
 201                                 },
 202                         },
 203                         {
 204                                 DECLARE_VOID_CHANNEL("proximity2")
 205                                 .num_events = 1,
 206                                 .event = {
 207                                         { DECLARE_EVENT("proximity2", "_", "", "", "thresh", "_", "either") },
 208                                 },
 209                         },
 210                         {
 211                                 DECLARE_VOID_CHANNEL("proximity3")
 212                                 .num_events = 1,
 213                                 .event = {
 214                                         { DECLARE_EVENT("proximity3", "_", "", "", "thresh", "_", "either") },
 215                                 },
 216                         },
 217                 },
 218         },
 219 };
 220
 221 unsigned int catalog_size = ARRAY_SIZE(sensor_catalog);
 222
 223 /* ACPI PLD (physical location of device) definitions, as used with sensors */
 224
 225 #define PANEL_FRONT     4
 226 #define PANEL_BACK      5
 227
 228 /* Buffer default length */
 229 #define BUFFER_LENGTH   16
 230
 231 /* We equate sensor handles to indices in these tables */
 232
 233 struct sensor_t sensor_desc[MAX_SENSORS];       /* Android-level descriptors */
 234 sensor_info_t   sensor[MAX_SENSORS];            /* Internal descriptors      */
 235 int             sensor_count;                   /* Detected sensors          */
 236
 237
 238 /* if the sensor has an _en attribute, we need to enable it */
 239 int get_needs_enable(int dev_num, const char *tag)
 240 {
 241         char sysfs_path[PATH_MAX];
 242         int fd;
 243
 244         sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
 245
 246         fd = open(sysfs_path, O_RDWR);
 247         if (fd == -1)
 248                 return 0;
 249
 250         close(fd);
 251         return 1;
 252 }
 253
 254 static void setup_properties_from_pld (int s, int panel, int rotation,
 255                                        int num_channels)
 256 {
 257         /*
 258          * Generate suitable order and opt_scale directives from the PLD panel
 259          * and rotation codes we got. This can later be superseded by the usual
 260          * properties if necessary. Eventually we'll need to replace these
 261          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
 262          */
 263
 264         int x = 1;
 265         int y = 1;
 266         int z = 1;
 267         int xy_swap = 0;
 268         int angle = rotation * 45;
 269
 270         /* Only deal with 3 axis chips for now */
 271         if (num_channels < 3)
 272                 return;
 273
 274         if (panel == PANEL_BACK) {
 275                 /* Chip placed on the back panel ; negate x and z */
 276                 x = -x;
 277                 z = -z;
 278         }
 279
 280         switch (angle) {
 281                 case 90: /* 90° clockwise: negate y then swap x,y */
 282                         xy_swap = 1;
 283                         y = -y;
 284                         break;
 285
 286                 case 180: /* Upside down: negate x and y */
 287                         x = -x;
 288                         y = -y;
 289                         break;
 290
 291                 case 270: /* 90° counter clockwise: negate x then swap x,y */
 292                         x = -x;
 293                         xy_swap = 1;
 294                         break;
 295         }
 296
 297         if (xy_swap) {
 298                 sensor[s].order[0] = 1;
 299                 sensor[s].order[1] = 0;
 300                 sensor[s].order[2] = 2;
 301                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 302         }
 303
 304         sensor[s].channel[0].opt_scale = x;
 305         sensor[s].channel[1].opt_scale = y;
 306         sensor[s].channel[2].opt_scale = z;
 307 }
 308
 309
 310 static int is_valid_pld (int panel, int rotation)
 311 {
 312         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 313                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 314                 return 0;
 315         }
 316
 317         /* Only deal with 90° rotations for now */
 318         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 319                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 320                 return 0;
 321         }
 322
 323         return 1;
 324 }
 325
 326
 327 static int read_pld_from_properties (int s, int* panel, int* rotation)
 328 {
 329         int p, r;
 330
 331         if (sensor_get_prop(s, "panel", &p))
 332                 return -1;
 333
 334         if (sensor_get_prop(s, "rotation", &r))
 335                 return -1;
 336
 337         if (!is_valid_pld(p, r))
 338                 return -1;
 339
 340         *panel = p;
 341         *rotation = r;
 342
 343         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 344
 345         return 0;
 346 }
 347
 348
 349 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 350 {
 351         char sysfs_path[PATH_MAX];
 352         int p,r;
 353
 354         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 355
 356         if (sysfs_read_int(sysfs_path, &p))
 357                 return -1;
 358
 359         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 360
 361         if (sysfs_read_int(sysfs_path, &r))
 362                 return -1;
 363
 364         if (!is_valid_pld(p, r))
 365                 return -1;
 366
 367         *panel = p;
 368         *rotation = r;
 369
 370         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 371
 372         return 0;
 373 }
 374
 375
 376 static void decode_placement_information (int dev_num, int num_channels, int s)
 377 {
 378         /*
 379          * See if we have optional "physical location of device" ACPI tags.
 380          * We're only interested in panel and rotation specifiers. Use the
 381          * .panel and .rotation properties in priority, and the actual ACPI
 382          * values as a second source.
 383          */
 384
 385         int panel;
 386         int rotation;
 387
 388         if (read_pld_from_properties(s, &panel, &rotation) &&
 389                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 390                         return; /* No PLD data available */
 391
 392         /* Map that to field ordering and scaling mechanisms */
 393         setup_properties_from_pld(s, panel, rotation, num_channels);
 394 }
 395
 396
 397 static int map_internal_to_external_type (int sensor_type)
 398 {
 399         /* Most sensors are internally identified using the Android type, but for some we use a different type specification internally */
 400
 401         switch (sensor_type) {
 402                 case SENSOR_TYPE_INTERNAL_ILLUMINANCE:
 403                 case SENSOR_TYPE_INTERNAL_INTENSITY:
 404                         return SENSOR_TYPE_LIGHT;
 405
 406                 default:
 407                         return sensor_type;
 408         }
 409 }
 410
 411 static void populate_descriptors (int s, int sensor_type)
 412 {
 413         int32_t         min_delay_us;
 414         max_delay_t     max_delay_us;
 415
 416         /* Initialize Android-visible descriptor */
 417         sensor_desc[s].name             = sensor_get_name(s);
 418         sensor_desc[s].vendor           = sensor_get_vendor(s);
 419         sensor_desc[s].version          = sensor_get_version(s);
 420         sensor_desc[s].handle           = s;
 421         sensor_desc[s].type             = map_internal_to_external_type(sensor_type);
 422
 423         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 424         sensor_desc[s].resolution       = sensor_get_resolution(s);
 425         sensor_desc[s].power            = sensor_get_power(s);
 426         sensor_desc[s].stringType       = sensor_get_string_type(s);
 427
 428         /* None of our supported sensors requires a special permission */
 429         sensor_desc[s].requiredPermission = "";
 430
 431         sensor_desc[s].flags = sensor_get_flags(s);
 432         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 433         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 434
 435         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 436                 s, sensor[s].friendly_name, sensor_desc[s].type,
 437                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 438                 sensor_desc[s].flags);
 439
 440         /* We currently do not implement batching */
 441         sensor_desc[s].fifoReservedEventCount = 0;
 442         sensor_desc[s].fifoMaxEventCount = 0;
 443
 444         min_delay_us = sensor_desc[s].minDelay;
 445         max_delay_us = sensor_desc[s].maxDelay;
 446
 447         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 448         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 449 }
 450
 451
 452 static void add_virtual_sensor (int catalog_index)
 453 {
 454         int s;
 455         int sensor_type;
 456
 457         if (sensor_count == MAX_SENSORS) {
 458                 ALOGE("Too many sensors!\n");
 459                 return;
 460         }
 461
 462         sensor_type = sensor_catalog[catalog_index].type;
 463
 464         s = sensor_count;
 465
 466         sensor[s].is_virtual = 1;
 467         sensor[s].catalog_index = catalog_index;
 468         sensor[s].type          = sensor_type;
 469
 470         populate_descriptors(s, sensor_type);
 471
 472         /* Initialize fields related to sysfs reads offloading */
 473         sensor[s].thread_data_fd[0]  = -1;
 474         sensor[s].thread_data_fd[1]  = -1;
 475         sensor[s].acquisition_thread = -1;
 476
 477         sensor_count++;
 478 }
 479
 480
 481 static int add_sensor (int dev_num, int catalog_index, int mode)
 482 {
 483         int s;
 484         int sensor_type;
 485         int retval;
 486         char sysfs_path[PATH_MAX];
 487         const char* prefix;
 488         float scale;
 489         int c;
 490         float opt_scale;
 491         const char* ch_name;
 492         int num_channels;
 493         char suffix[MAX_NAME_SIZE + 8];
 494         int calib_bias;
 495         int buffer_length;
 496
 497         if (sensor_count == MAX_SENSORS) {
 498                 ALOGE("Too many sensors!\n");
 499                 return -1;
 500         }
 501
 502         sensor_type = sensor_catalog[catalog_index].type;
 503
 504         /*
 505          * At this point we could check that the expected sysfs attributes are
 506          * present ; that would enable having multiple catalog entries with the
 507          * same sensor type, accomodating different sets of sysfs attributes.
 508          */
 509
 510         s = sensor_count;
 511
 512         sensor[s].dev_num       = dev_num;
 513         sensor[s].catalog_index = catalog_index;
 514         sensor[s].type          = sensor_type;
 515         sensor[s].mode          = mode;
 516         sensor[s].trigger_nr = -1;      /* -1 means no trigger - we'll populate these at a later time */
 517
 518         num_channels = sensor_catalog[catalog_index].num_channels;
 519
 520         if (mode == MODE_POLL)
 521                 sensor[s].num_channels = 0;
 522         else
 523                 sensor[s].num_channels = num_channels;
 524
 525         /* Populate the quirks array */
 526         sensor_get_quirks(s);
 527
 528         /* Reject interfaces that may have been disabled through a quirk for this driver */
 529         if ((mode == MODE_EVENT   && (sensor[s].quirks & QUIRK_NO_EVENT_MODE)) ||
 530             (mode == MODE_TRIGGER && (sensor[s].quirks & QUIRK_NO_TRIG_MODE )) ||
 531             (mode == MODE_POLL    && (sensor[s].quirks & QUIRK_NO_POLL_MODE ))) {
 532                 memset(&sensor[s], 0, sizeof(sensor[0]));
 533                 return -1;
 534         }
 535
 536         prefix = sensor_catalog[catalog_index].tag;
 537
 538         /*
 539          * receiving the illumination sensor calibration inputs from
 540          * the Android properties and setting it within sysfs
 541          */
 542         if (sensor_type == SENSOR_TYPE_INTERNAL_ILLUMINANCE) {
 543                 retval = sensor_get_illumincalib(s);
 544                 if (retval > 0) {
 545                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 546                         sysfs_write_int(sysfs_path, retval);
 547                 }
 548         }
 549
 550         /*
 551          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 552          * 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
 553          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 554          */
 555
 556         if (num_channels) {
 557                 for (c = 0; c < num_channels; c++) {
 558                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 559                         sprintf(suffix, "%s.calib_bias", ch_name);
 560                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 561                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 562                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 563                                 sysfs_write_int(sysfs_path, calib_bias);
 564                         }
 565                 }
 566         } else
 567                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 568                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 569                                 sysfs_write_int(sysfs_path, calib_bias);
 570                         }
 571
 572         /* Change buffer length according to the property or use default value */
 573         if (mode == MODE_TRIGGER) {
 574                 if (sensor_get_prop(s, "buffer_length", &buffer_length)) {
 575                         buffer_length = BUFFER_LENGTH;
 576                 }
 577
 578                 sprintf(sysfs_path, BUFFER_LENGTH_PATH, dev_num);
 579
 580                 if (sysfs_write_int(sysfs_path, buffer_length) <= 0) {
 581                         ALOGE("Failed to set buffer length on dev%d", dev_num);
 582                 }
 583         }
 584
 585         /* Read name attribute, if available */
 586         sprintf(sysfs_path, NAME_PATH, dev_num);
 587         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 588
 589         /* See if we have general offsets and scale values for this sensor */
 590
 591         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 592         sysfs_read_float(sysfs_path, &sensor[s].offset);
 593
 594         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 595         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 596                 /*
 597                  * There is a chip preferred scale specified,
 598                  * so try to store it in sensor's scale file
 599                  */
 600                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 601                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 602                         /* Store failed, try to store the scale into channel specific file */
 603                         for (c = 0; c < num_channels; c++)
 604                         {
 605                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 606                                         sensor_catalog[catalog_index].channel[c].scale_path);
 607                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 608                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 609                         }
 610                 }
 611         }
 612
 613         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 614         if (!sysfs_read_float(sysfs_path, &scale)) {
 615                 sensor[s].scale = scale;
 616                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 617                                         sysfs_path, scale, dev_num);
 618         } else {
 619                 sensor[s].scale = 1;
 620
 621                 /* Read channel specific scale if any*/
 622                 for (c = 0; c < num_channels; c++)
 623                 {
 624                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 625                            sensor_catalog[catalog_index].channel[c].scale_path);
 626
 627                         if (!sysfs_read_float(sysfs_path, &scale)) {
 628                                 sensor[s].channel[c].scale = scale;
 629                                 sensor[s].scale = 0;
 630
 631                                 ALOGV(  "Scale path:%s "
 632                                         "channel scale:%g dev_num:%d\n",
 633                                         sysfs_path, scale, dev_num);
 634                         }
 635                 }
 636         }
 637
 638         /* Set default scaling - if num_channels is zero, we have one channel */
 639
 640         sensor[s].channel[0].opt_scale = 1;
 641
 642         for (c = 1; c < num_channels; c++)
 643                 sensor[s].channel[c].opt_scale = 1;
 644
 645         for (c = 0; c < num_channels; c++) {
 646                 /* Check the presence of the channel's input_path */
 647                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 648                         sensor_catalog[catalog_index].channel[c].input_path);
 649                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 650                 /* Check the presence of the channel's raw_path */
 651                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 652                         sensor_catalog[catalog_index].channel[c].raw_path);
 653                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 654         }
 655
 656         sensor_get_available_frequencies(s);
 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 extern float sensor_get_max_static_freq(int s);
 886 extern float sensor_get_min_freq (int s);
 887
 888 static int create_hrtimer_trigger(int s, int trigger)
 889 {
 890         struct stat dir_status;
 891         char buf[MAX_NAME_SIZE];
 892         char hrtimer_path[PATH_MAX];
 893         char hrtimer_name[MAX_NAME_SIZE];
 894         float min_supported_rate = 1, min_rate_cap, max_supported_rate;
 895
 896         snprintf(buf, MAX_NAME_SIZE, "hrtimer-%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 897         snprintf(hrtimer_name, MAX_NAME_SIZE, "%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 898         snprintf(hrtimer_path, PATH_MAX, "%s%s", CONFIGFS_TRIGGER_PATH, buf);
 899
 900         /* Get parent dir status */
 901         if (stat(CONFIGFS_TRIGGER_PATH, &dir_status))
 902                 return -1;
 903
 904         /* Create hrtimer with the same access rights as it's parent */
 905         if (mkdir(hrtimer_path, dir_status.st_mode))
 906                 if (errno != EEXIST)
 907                         return -1;
 908
 909         strncpy (sensor[s].hrtimer_trigger_name, hrtimer_name, MAX_NAME_SIZE);
 910         sensor[s].trigger_nr = trigger;
 911
 912         max_supported_rate = sensor_get_max_static_freq(s);
 913
 914         /* set 0 for wrong values */
 915         if (max_supported_rate < 0.1) {
 916                 max_supported_rate = 0;
 917         }
 918
 919         sensor[s].max_supported_rate = max_supported_rate;
 920         sensor_desc[s].minDelay = max_supported_rate ? (int32_t) (1000000.0 / max_supported_rate) : 0;
 921
 922         /* Check if a minimum rate was specified for this sensor */
 923         min_rate_cap = sensor_get_min_freq(s);
 924
 925         if (min_supported_rate < min_rate_cap) {
 926                 min_supported_rate = min_rate_cap;
 927         }
 928
 929         sensor[s].min_supported_rate = min_supported_rate;
 930         sensor_desc[s].maxDelay = (max_delay_t) (1000000.0 / min_supported_rate);
 931
 932         return 0;
 933 }
 934
 935 static void setup_trigger_names (void)
 936 {
 937         char filename[PATH_MAX];
 938         char buf[MAX_NAME_SIZE];
 939         int s;
 940         int trigger;
 941         int ret;
 942         int updated[MAX_SENSORS] = {0};
 943
 944         /* By default, use the name-dev convention that most drivers use */
 945         for (s=0; s<sensor_count; s++)
 946                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 947
 948         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 949
 950         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 951
 952                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH, trigger);
 953
 954                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 955
 956                 if (ret < 0)
 957                         break;
 958
 959                 /* Record initial and any-motion triggers names */
 960                 update_sensor_matching_trigger_name(buf, updated, trigger);
 961         }
 962
 963
 964         /* If we don't have any other trigger exposed and quirk hrtimer is set setup the hrtimer name here  - and create it also */
 965         for (s=0; s<sensor_count && trigger<MAX_TRIGGERS; s++) {
 966                 if ((sensor[s].quirks & QUIRK_HRTIMER) && !updated[s]) {
 967                         create_hrtimer_trigger(s, trigger);
 968                         trigger++;
 969                 }
 970         }
 971
 972         /*
 973          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 974          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 975          */
 976
 977         for (s=0; s<sensor_count; s++)
 978                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 979                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 980
 981         for (s=0; s<sensor_count; s++)
 982                 if (sensor[s].mode == MODE_TRIGGER) {
 983                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 984                         if (sensor[s].motion_trigger_name[0])
 985                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 986                         if (sensor[s].hrtimer_trigger_name[0])
 987                                 ALOGI("Sensor %d (%s) hrtimer trigger: %s\n", s, sensor[s].friendly_name, sensor[s].hrtimer_trigger_name);
 988                 }
 989 }
 990
 991
 992 static int catalog_index_from_sensor_type (int type)
 993 {
 994         /* Return first matching catalog entry index for selected type */
 995         unsigned int i;
 996
 997         for (i=0; i<catalog_size; i++)
 998                 if (sensor_catalog[i].type == type)
 999                         return i;
1000
1001         return -1;
1002 }
1003
1004
1005 static void post_process_sensor_list (char poll_map[catalog_size], char trig_map[catalog_size], char event_map[catalog_size])
1006 {
1007         int illuminance_cat_index = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_ILLUMINANCE);
1008         int intensity_cat_index   = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_INTENSITY);
1009         int illuminance_found     = poll_map[illuminance_cat_index] || trig_map[illuminance_cat_index] || event_map[illuminance_cat_index];
1010
1011         /* If an illumimance sensor has been reported */
1012         if (illuminance_found) {
1013                 /* Hide any intensity sensors we can have for the same iio device */
1014                 poll_map [intensity_cat_index     ] = 0;
1015                 trig_map [intensity_cat_index     ] = 0;
1016                 event_map[intensity_cat_index     ] = 0;
1017                 return;
1018         }
1019 }
1020
1021
1022 static void swap_sensors (int s1, int s2)
1023 {
1024         struct sensor_t temp_sensor_desc;
1025         sensor_info_t   temp_sensor;
1026
1027         /* S1 -> temp */
1028         memcpy(&temp_sensor, &sensor[s1], sizeof(sensor_info_t));
1029         memcpy(&temp_sensor_desc, &sensor_desc[s1], sizeof(struct sensor_t));
1030
1031         /* S2 -> S1 */
1032         memcpy(&sensor[s1], &sensor[s2], sizeof(sensor_info_t));
1033         memcpy(&sensor_desc[s1], &sensor_desc[s2], sizeof(struct sensor_t));
1034
1035         /* temp -> S2 */
1036         memcpy(&sensor[s2], &temp_sensor, sizeof(sensor_info_t));
1037         memcpy(&sensor_desc[s2], &temp_sensor_desc,  sizeof(struct sensor_t));
1038
1039         /* Fix-up sensor id mapping, which is stale */
1040         sensor_desc[s1].handle  = s1;
1041         sensor_desc[s2].handle  = s2;
1042
1043         /* Fix up name and vendor buffer pointers, which are potentially stale pointers */
1044         sensor_desc[s1].name            = sensor_get_name(s1);
1045         sensor_desc[s1].vendor          = sensor_get_vendor(s1);
1046         sensor_desc[s2].name            = sensor_get_name(s2);
1047         sensor_desc[s2].vendor          = sensor_get_vendor(s2);
1048 }
1049
1050
1051 static void reorder_sensors (void)
1052 {
1053         /* Some sensors may be marked as secondary - these need to be listed after other sensors of the same type */
1054         int s1, s2;
1055
1056         for (s1=0; s1<sensor_count-1; s1++)
1057                 if (sensor[s1].quirks & QUIRK_SECONDARY) {
1058                         /* Search for subsequent sensors of same type */
1059                         for (s2 = s1+1; s2<sensor_count; s2++)
1060                                 if (sensor[s2].type == sensor[s1].type && !(sensor[s2].quirks & QUIRK_SECONDARY)) {
1061                                         ALOGI("Sensor S%d has higher priority than S%d, swapping\n", s2, s1);
1062                                         swap_sensors(s1, s2);
1063                                         break;
1064                                 }
1065                 }
1066 }
1067
1068
1069 void enumerate_sensors (void)
1070 {
1071         /*
1072          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
1073          * 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
1074          * and trigger-based sensor, use the trigger usage mode.
1075          */
1076         char poll_sensors[catalog_size];
1077         char trig_sensors[catalog_size];
1078         char event_sensors[catalog_size];
1079         int dev_num;
1080         unsigned int i;
1081         int trig_found;
1082         int s;
1083
1084         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
1085                 trig_found = 0;
1086
1087                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
1088                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
1089                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
1090
1091                 /* Hide specific sensor types if appropriate */
1092                 post_process_sensor_list(poll_sensors, trig_sensors, event_sensors);
1093
1094                 for (i=0; i<catalog_size; i++) {
1095                         /* Try using events interface */
1096                         if (event_sensors[i] && !add_sensor(dev_num, i, MODE_EVENT))
1097                                 continue;
1098
1099                         /* Then trigger */
1100                         if (trig_sensors[i] && !add_sensor(dev_num, i, MODE_TRIGGER)) {
1101                                 trig_found = 1;
1102                                 continue;
1103                         }
1104
1105                         /* Try polling otherwise */
1106                         if (poll_sensors[i])
1107                                 add_sensor(dev_num, i, MODE_POLL);
1108                 }
1109
1110                 if (trig_found)
1111                         build_sensor_report_maps(dev_num);
1112         }
1113
1114         /* Make sure secondary sensors appear after primary ones */
1115         reorder_sensors();
1116
1117         ALOGI("Discovered %d sensors\n", sensor_count);
1118
1119         /* Set up default - as well as custom - trigger names */
1120         setup_trigger_names();
1121
1122         ALOGI("Discovered %d sensors\n", sensor_count);
1123
1124         virtual_sensors_check();
1125
1126         for (s=0; s<sensor_count; s++) {
1127                 ALOGI("S%d: %s\n", s, sensor[s].friendly_name);
1128         }
1129 }
1130
1131
1132 void delete_enumeration_data (void)
1133 {
1134         int i;
1135         for (i = 0; i < sensor_count; i++)
1136                 if (sensor[i].cal_data) {
1137                         free(sensor[i].cal_data);
1138                         sensor[i].cal_data = NULL;
1139                         sensor[i].cal_level = 0;
1140                 }
1141
1142         /* Reset sensor count */
1143         sensor_count = 0;
1144 }
1145
1146
1147 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
1148                       struct sensor_t const** list)
1149 {
1150         *list = sensor_desc;
1151         return sensor_count;
1152 }
1153