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 /* We equate sensor handles to indices in these tables */
 229
 230 struct sensor_t sensor_desc[MAX_SENSORS];       /* Android-level descriptors */
 231 sensor_info_t   sensor[MAX_SENSORS];            /* Internal descriptors      */
 232 int             sensor_count;                   /* Detected sensors          */
 233
 234
 235 /* if the sensor has an _en attribute, we need to enable it */
 236 int get_needs_enable(int dev_num, const char *tag)
 237 {
 238         char sysfs_path[PATH_MAX];
 239         int fd;
 240
 241         sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
 242
 243         fd = open(sysfs_path, O_RDWR);
 244         if (fd == -1)
 245                 return 0;
 246
 247         close(fd);
 248         return 1;
 249 }
 250
 251 static void setup_properties_from_pld (int s, int panel, int rotation,
 252                                        int num_channels)
 253 {
 254         /*
 255          * Generate suitable order and opt_scale directives from the PLD panel
 256          * and rotation codes we got. This can later be superseded by the usual
 257          * properties if necessary. Eventually we'll need to replace these
 258          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
 259          */
 260
 261         int x = 1;
 262         int y = 1;
 263         int z = 1;
 264         int xy_swap = 0;
 265         int angle = rotation * 45;
 266
 267         /* Only deal with 3 axis chips for now */
 268         if (num_channels < 3)
 269                 return;
 270
 271         if (panel == PANEL_BACK) {
 272                 /* Chip placed on the back panel ; negate x and z */
 273                 x = -x;
 274                 z = -z;
 275         }
 276
 277         switch (angle) {
 278                 case 90: /* 90° clockwise: negate y then swap x,y */
 279                         xy_swap = 1;
 280                         y = -y;
 281                         break;
 282
 283                 case 180: /* Upside down: negate x and y */
 284                         x = -x;
 285                         y = -y;
 286                         break;
 287
 288                 case 270: /* 90° counter clockwise: negate x then swap x,y */
 289                         x = -x;
 290                         xy_swap = 1;
 291                         break;
 292         }
 293
 294         if (xy_swap) {
 295                 sensor[s].order[0] = 1;
 296                 sensor[s].order[1] = 0;
 297                 sensor[s].order[2] = 2;
 298                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 299         }
 300
 301         sensor[s].channel[0].opt_scale = x;
 302         sensor[s].channel[1].opt_scale = y;
 303         sensor[s].channel[2].opt_scale = z;
 304 }
 305
 306
 307 static int is_valid_pld (int panel, int rotation)
 308 {
 309         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 310                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 311                 return 0;
 312         }
 313
 314         /* Only deal with 90° rotations for now */
 315         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 316                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 317                 return 0;
 318         }
 319
 320         return 1;
 321 }
 322
 323
 324 static int read_pld_from_properties (int s, int* panel, int* rotation)
 325 {
 326         int p, r;
 327
 328         if (sensor_get_prop(s, "panel", &p))
 329                 return -1;
 330
 331         if (sensor_get_prop(s, "rotation", &r))
 332                 return -1;
 333
 334         if (!is_valid_pld(p, r))
 335                 return -1;
 336
 337         *panel = p;
 338         *rotation = r;
 339
 340         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 341
 342         return 0;
 343 }
 344
 345
 346 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 347 {
 348         char sysfs_path[PATH_MAX];
 349         int p,r;
 350
 351         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 352
 353         if (sysfs_read_int(sysfs_path, &p))
 354                 return -1;
 355
 356         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 357
 358         if (sysfs_read_int(sysfs_path, &r))
 359                 return -1;
 360
 361         if (!is_valid_pld(p, r))
 362                 return -1;
 363
 364         *panel = p;
 365         *rotation = r;
 366
 367         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 368
 369         return 0;
 370 }
 371
 372
 373 static void decode_placement_information (int dev_num, int num_channels, int s)
 374 {
 375         /*
 376          * See if we have optional "physical location of device" ACPI tags.
 377          * We're only interested in panel and rotation specifiers. Use the
 378          * .panel and .rotation properties in priority, and the actual ACPI
 379          * values as a second source.
 380          */
 381
 382         int panel;
 383         int rotation;
 384
 385         if (read_pld_from_properties(s, &panel, &rotation) &&
 386                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 387                         return; /* No PLD data available */
 388
 389         /* Map that to field ordering and scaling mechanisms */
 390         setup_properties_from_pld(s, panel, rotation, num_channels);
 391 }
 392
 393
 394 static int map_internal_to_external_type (int sensor_type)
 395 {
 396         /* Most sensors are internally identified using the Android type, but for some we use a different type specification internally */
 397
 398         switch (sensor_type) {
 399                 case SENSOR_TYPE_INTERNAL_ILLUMINANCE:
 400                 case SENSOR_TYPE_INTERNAL_INTENSITY:
 401                         return SENSOR_TYPE_LIGHT;
 402
 403                 default:
 404                         return sensor_type;
 405         }
 406 }
 407
 408 static void populate_descriptors (int s, int sensor_type)
 409 {
 410         int32_t         min_delay_us;
 411         max_delay_t     max_delay_us;
 412
 413         /* Initialize Android-visible descriptor */
 414         sensor_desc[s].name             = sensor_get_name(s);
 415         sensor_desc[s].vendor           = sensor_get_vendor(s);
 416         sensor_desc[s].version          = sensor_get_version(s);
 417         sensor_desc[s].handle           = s;
 418         sensor_desc[s].type             = map_internal_to_external_type(sensor_type);
 419
 420         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 421         sensor_desc[s].resolution       = sensor_get_resolution(s);
 422         sensor_desc[s].power            = sensor_get_power(s);
 423         sensor_desc[s].stringType       = sensor_get_string_type(s);
 424
 425         /* None of our supported sensors requires a special permission */
 426         sensor_desc[s].requiredPermission = "";
 427
 428         sensor_desc[s].flags = sensor_get_flags(s);
 429         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 430         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 431
 432         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 433                 s, sensor[s].friendly_name, sensor_desc[s].type,
 434                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 435                 sensor_desc[s].flags);
 436
 437         /* We currently do not implement batching */
 438         sensor_desc[s].fifoReservedEventCount = 0;
 439         sensor_desc[s].fifoMaxEventCount = 0;
 440
 441         min_delay_us = sensor_desc[s].minDelay;
 442         max_delay_us = sensor_desc[s].maxDelay;
 443
 444         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 445         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 446 }
 447
 448
 449 static void add_virtual_sensor (int catalog_index)
 450 {
 451         int s;
 452         int sensor_type;
 453
 454         if (sensor_count == MAX_SENSORS) {
 455                 ALOGE("Too many sensors!\n");
 456                 return;
 457         }
 458
 459         sensor_type = sensor_catalog[catalog_index].type;
 460
 461         s = sensor_count;
 462
 463         sensor[s].is_virtual = 1;
 464         sensor[s].catalog_index = catalog_index;
 465         sensor[s].type          = sensor_type;
 466
 467         populate_descriptors(s, sensor_type);
 468
 469         /* Initialize fields related to sysfs reads offloading */
 470         sensor[s].thread_data_fd[0]  = -1;
 471         sensor[s].thread_data_fd[1]  = -1;
 472         sensor[s].acquisition_thread = -1;
 473
 474         sensor_count++;
 475 }
 476
 477
 478 static int add_sensor (int dev_num, int catalog_index, int mode)
 479 {
 480         int s;
 481         int sensor_type;
 482         int retval;
 483         char sysfs_path[PATH_MAX];
 484         const char* prefix;
 485         float scale;
 486         int c;
 487         float opt_scale;
 488         const char* ch_name;
 489         int num_channels;
 490         char suffix[MAX_NAME_SIZE + 8];
 491         int calib_bias;
 492
 493         if (sensor_count == MAX_SENSORS) {
 494                 ALOGE("Too many sensors!\n");
 495                 return -1;
 496         }
 497
 498         sensor_type = sensor_catalog[catalog_index].type;
 499
 500         /*
 501          * At this point we could check that the expected sysfs attributes are
 502          * present ; that would enable having multiple catalog entries with the
 503          * same sensor type, accomodating different sets of sysfs attributes.
 504          */
 505
 506         s = sensor_count;
 507
 508         sensor[s].dev_num       = dev_num;
 509         sensor[s].catalog_index = catalog_index;
 510         sensor[s].type          = sensor_type;
 511         sensor[s].mode          = mode;
 512         sensor[s].trigger_nr = -1;      /* -1 means no trigger - we'll populate these at a later time */
 513
 514         num_channels = sensor_catalog[catalog_index].num_channels;
 515
 516         if (mode == MODE_POLL)
 517                 sensor[s].num_channels = 0;
 518         else
 519                 sensor[s].num_channels = num_channels;
 520
 521         /* Populate the quirks array */
 522         sensor_get_quirks(s);
 523
 524         /* Reject interfaces that may have been disabled through a quirk for this driver */
 525         if ((mode == MODE_EVENT   && (sensor[s].quirks & QUIRK_NO_EVENT_MODE)) ||
 526             (mode == MODE_TRIGGER && (sensor[s].quirks & QUIRK_NO_TRIG_MODE )) ||
 527             (mode == MODE_POLL    && (sensor[s].quirks & QUIRK_NO_POLL_MODE ))) {
 528                 memset(&sensor[s], 0, sizeof(sensor[0]));
 529                 return -1;
 530         }
 531
 532         prefix = sensor_catalog[catalog_index].tag;
 533
 534         /*
 535          * receiving the illumination sensor calibration inputs from
 536          * the Android properties and setting it within sysfs
 537          */
 538         if (sensor_type == SENSOR_TYPE_INTERNAL_ILLUMINANCE) {
 539                 retval = sensor_get_illumincalib(s);
 540                 if (retval > 0) {
 541                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 542                         sysfs_write_int(sysfs_path, retval);
 543                 }
 544         }
 545
 546         /*
 547          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 548          * 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
 549          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 550          */
 551
 552         if (num_channels) {
 553                 for (c = 0; c < num_channels; c++) {
 554                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 555                         sprintf(suffix, "%s.calib_bias", ch_name);
 556                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 557                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 558                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 559                                 sysfs_write_int(sysfs_path, calib_bias);
 560                         }
 561                 }
 562         } else
 563                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 564                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 565                                 sysfs_write_int(sysfs_path, calib_bias);
 566                         }
 567
 568         /* Read name attribute, if available */
 569         sprintf(sysfs_path, NAME_PATH, dev_num);
 570         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 571
 572         /* See if we have general offsets and scale values for this sensor */
 573
 574         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 575         sysfs_read_float(sysfs_path, &sensor[s].offset);
 576
 577         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 578         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 579                 /*
 580                  * There is a chip preferred scale specified,
 581                  * so try to store it in sensor's scale file
 582                  */
 583                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 584                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 585                         /* Store failed, try to store the scale into channel specific file */
 586                         for (c = 0; c < num_channels; c++)
 587                         {
 588                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 589                                         sensor_catalog[catalog_index].channel[c].scale_path);
 590                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 591                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 592                         }
 593                 }
 594         }
 595
 596         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 597         if (!sysfs_read_float(sysfs_path, &scale)) {
 598                 sensor[s].scale = scale;
 599                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 600                                         sysfs_path, scale, dev_num);
 601         } else {
 602                 sensor[s].scale = 1;
 603
 604                 /* Read channel specific scale if any*/
 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
 610                         if (!sysfs_read_float(sysfs_path, &scale)) {
 611                                 sensor[s].channel[c].scale = scale;
 612                                 sensor[s].scale = 0;
 613
 614                                 ALOGV(  "Scale path:%s "
 615                                         "channel scale:%g dev_num:%d\n",
 616                                         sysfs_path, scale, dev_num);
 617                         }
 618                 }
 619         }
 620
 621         /* Set default scaling - if num_channels is zero, we have one channel */
 622
 623         sensor[s].channel[0].opt_scale = 1;
 624
 625         for (c = 1; c < num_channels; c++)
 626                 sensor[s].channel[c].opt_scale = 1;
 627
 628         for (c = 0; c < num_channels; c++) {
 629                 /* Check the presence of the channel's input_path */
 630                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 631                         sensor_catalog[catalog_index].channel[c].input_path);
 632                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 633                 /* Check the presence of the channel's raw_path */
 634                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 635                         sensor_catalog[catalog_index].channel[c].raw_path);
 636                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 637         }
 638
 639         if (sensor_get_mounting_matrix(s, sensor[s].mounting_matrix))
 640                 sensor[s].quirks |= QUIRK_MOUNTING_MATRIX;
 641         else
 642                 /* Read ACPI _PLD attributes for this sensor, if there are any */
 643                 decode_placement_information(dev_num, num_channels, s);
 644
 645         /*
 646          * See if we have optional correction scaling factors for each of the
 647          * channels of this sensor. These would be expressed using properties
 648          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 649          * support things such as iio.temp.opt_scale = -1. Note that this works
 650          * for all types of sensors, and whatever transform is selected, on top
 651          * of any previous conversions.
 652          */
 653
 654         if (num_channels) {
 655                 for (c = 0; c < num_channels; c++) {
 656                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 657                         sprintf(suffix, "%s.opt_scale", ch_name);
 658                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 659                                 sensor[s].channel[c].opt_scale = opt_scale;
 660                 }
 661         } else {
 662                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 663                         sensor[s].channel[0].opt_scale = opt_scale;
 664         }
 665
 666         populate_descriptors(s, sensor_type);
 667
 668         if (sensor[s].internal_name[0] == '\0') {
 669                 /*
 670                  * In case the kernel-mode driver doesn't expose a name for
 671                  * the iio device, use (null)-dev%d as the trigger name...
 672                  * This can be considered a kernel-mode iio driver bug.
 673                  */
 674                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 675                 strcpy(sensor[s].internal_name, "(null)");
 676         }
 677
 678         switch (sensor_type) {
 679                 case SENSOR_TYPE_ACCELEROMETER:
 680                         /* Only engage accelerometer bias compensation if really needed */
 681                         if (sensor_get_quirks(s) & QUIRK_BIASED)
 682                                 sensor[s].cal_data = calloc(1, sizeof(accel_cal_t));
 683                         break;
 684
 685                         case SENSOR_TYPE_GYROSCOPE:
 686                         sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
 687                         break;
 688
 689                 case SENSOR_TYPE_MAGNETIC_FIELD:
 690                         sensor[s].cal_data = malloc(sizeof(compass_cal_t));
 691                         break;
 692         }
 693
 694         sensor[s].max_cal_level = sensor_get_cal_steps(s);
 695
 696         /* Select one of the available sensor sample processing styles */
 697         select_transform(s);
 698
 699         /* Initialize fields related to sysfs reads offloading */
 700         sensor[s].thread_data_fd[0]  = -1;
 701         sensor[s].thread_data_fd[1]  = -1;
 702         sensor[s].acquisition_thread = -1;
 703
 704         /* Check if we have a special ordering property on this sensor */
 705         if (sensor_get_order(s, sensor[s].order))
 706                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 707
 708         sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
 709
 710         sensor_count++;
 711         return 0;
 712 }
 713
 714 static void virtual_sensors_check (void)
 715 {
 716         int i;
 717         int has_acc = 0;
 718         int has_gyr = 0;
 719         int has_mag = 0;
 720         int has_rot = 0;
 721         int has_ori = 0;
 722         int gyro_cal_idx = 0;
 723         int magn_cal_idx = 0;
 724         unsigned int j;
 725
 726         for (i=0; i<sensor_count; i++)
 727                 switch (sensor[i].type) {
 728                         case SENSOR_TYPE_ACCELEROMETER:
 729                                 has_acc = 1;
 730                                 break;
 731                         case SENSOR_TYPE_GYROSCOPE:
 732                                 has_gyr = 1;
 733                                 gyro_cal_idx = i;
 734                                 break;
 735                         case SENSOR_TYPE_MAGNETIC_FIELD:
 736                                 has_mag = 1;
 737                                 magn_cal_idx = i;
 738                                 break;
 739                         case SENSOR_TYPE_ORIENTATION:
 740                                 has_ori = 1;
 741                                 break;
 742                         case SENSOR_TYPE_ROTATION_VECTOR:
 743                                 has_rot = 1;
 744                                 break;
 745                 }
 746
 747         for (j=0; j<catalog_size; j++)
 748                 switch (sensor_catalog[j].type) {
 749                         /*
 750                          * If we have accel + gyro + magn but no rotation vector sensor,
 751                          * SensorService replaces the HAL provided orientation sensor by the
 752                          * AOSP version... provided we report one. So initialize a virtual
 753                          * orientation sensor with zero values, which will get replaced. See:
 754                          * frameworks/native/services/sensorservice/SensorService.cpp, looking
 755                          * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 756                          * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 757                          */
 758
 759                         case SENSOR_TYPE_ORIENTATION:
 760                                 if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 761                                         add_sensor(0, j, MODE_POLL);
 762                                 break;
 763                         case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 764                                 if (has_gyr) {
 765                                         sensor[sensor_count].base_count = 1;
 766                                         sensor[sensor_count].base[0] = gyro_cal_idx;
 767                                         add_virtual_sensor(j);
 768                                 }
 769                                 break;
 770                         case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
 771                                 if (has_mag) {
 772                                         sensor[sensor_count].base_count = 1;
 773                                         sensor[sensor_count].base[0] = magn_cal_idx;
 774                                         add_virtual_sensor(j);
 775                                 }
 776                                 break;
 777                         default:
 778                                 break;
 779                 }
 780 }
 781
 782
 783 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 784                                  int sensor_name_len)
 785 {
 786         /*
 787          * A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
 788          *  and select it if it is so. The format is something like sensor_name-dev0.
 789          */
 790
 791         const char *suffix = trigger_name + sensor_name_len + 1;
 792
 793         /* dev is the default, and lowest priority; no need to update */
 794         if (!memcmp(suffix, "dev", 3))
 795                 return;
 796
 797         /* If we found any-motion trigger, record it */
 798
 799         if (!memcmp(suffix, "any-motion-", 11)) {
 800                 strcpy(sensor[s].motion_trigger_name, trigger_name);
 801                 return;
 802         }
 803
 804         /* If we found a hrtimer trigger, record it */
 805         if (!memcmp(suffix, "hr-dev", 6)) {
 806                 strcpy(sensor[s].hrtimer_trigger_name, trigger_name);
 807                 return;
 808         }
 809         /*
 810          * 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
 811          * of the trigger to use with this sensor.
 812          */
 813         strcpy(sensor[s].init_trigger_name, trigger_name);
 814 }
 815
 816
 817 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE], int* updated, int trigger)
 818 {
 819         /*
 820          * Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
 821          * 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
 822          * when enabling this sensor.
 823          */
 824
 825         int s;
 826         int dev_num;
 827         int len;
 828         char* cursor;
 829         int sensor_name_len;
 830
 831         /*
 832          * First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
 833          * to be this number, so perform a few checks.
 834          */
 835         len = strnlen(name, MAX_NAME_SIZE);
 836
 837         if (len < 2)
 838                 return;
 839
 840         cursor = name + len - 1;
 841
 842         if (!isdigit(*cursor))
 843                 return;
 844
 845         while (len && isdigit(*cursor)) {
 846                 len--;
 847                 cursor--;
 848         }
 849
 850         dev_num = atoi(cursor+1);
 851
 852         /* See if that matches a sensor */
 853         for (s=0; s<sensor_count; s++)
 854                 if (sensor[s].dev_num == dev_num) {
 855
 856                         sensor_name_len = strlen(sensor[s].internal_name);
 857
 858                         if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
 859                                 /* Switch to new trigger if appropriate */
 860                                 propose_new_trigger(s, name, sensor_name_len);
 861                                 updated[s] = 1;
 862                                 sensor[s].trigger_nr = trigger;
 863                 }
 864 }
 865
 866 static int create_hrtimer_trigger(int s, int trigger)
 867 {
 868         struct stat dir_status;
 869         char buf[MAX_NAME_SIZE];
 870         char hrtimer_path[PATH_MAX];
 871         char hrtimer_name[MAX_NAME_SIZE];
 872
 873         snprintf(buf, MAX_NAME_SIZE, "hrtimer-%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 874         snprintf(hrtimer_name, MAX_NAME_SIZE, "%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 875         snprintf(hrtimer_path, PATH_MAX, "%s%s", CONFIGFS_TRIGGER_PATH, buf);
 876
 877         /* Get parent dir status */
 878         if (stat(CONFIGFS_TRIGGER_PATH, &dir_status))
 879                 return -1;
 880
 881         /* Create hrtimer with the same access rights as it's parent */
 882         if (mkdir(hrtimer_path, dir_status.st_mode))
 883                 if (errno != EEXIST)
 884                         return -1;
 885
 886         strncpy (sensor[s].hrtimer_trigger_name, hrtimer_name, MAX_NAME_SIZE);
 887         sensor[s].trigger_nr = trigger;
 888         return 0;
 889 }
 890
 891 static void setup_trigger_names (void)
 892 {
 893         char filename[PATH_MAX];
 894         char buf[MAX_NAME_SIZE];
 895         int s;
 896         int trigger;
 897         int ret;
 898         int updated[MAX_SENSORS] = {0};
 899
 900         /* By default, use the name-dev convention that most drivers use */
 901         for (s=0; s<sensor_count; s++)
 902                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 903
 904         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 905
 906         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 907
 908                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH, trigger);
 909
 910                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 911
 912                 if (ret < 0)
 913                         break;
 914
 915                 /* Record initial and any-motion triggers names */
 916                 update_sensor_matching_trigger_name(buf, updated, trigger);
 917         }
 918
 919
 920         /* If we don't have any other trigger exposed and quirk hrtimer is set setup the hrtimer name here  - and create it also */
 921         for (s=0; s<sensor_count && trigger<MAX_TRIGGERS; s++) {
 922                 if ((sensor[s].quirks & QUIRK_HRTIMER) && !updated[s]) {
 923                         create_hrtimer_trigger(s, trigger);
 924                         trigger++;
 925                 }
 926         }
 927
 928         /*
 929          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 930          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 931          */
 932
 933         for (s=0; s<sensor_count; s++)
 934                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 935                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 936
 937         for (s=0; s<sensor_count; s++)
 938                 if (sensor[s].mode == MODE_TRIGGER) {
 939                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 940                         if (sensor[s].motion_trigger_name[0])
 941                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 942                         if (sensor[s].hrtimer_trigger_name[0])
 943                                 ALOGI("Sensor %d (%s) hrtimer trigger: %s\n", s, sensor[s].friendly_name, sensor[s].hrtimer_trigger_name);
 944                 }
 945 }
 946
 947
 948 static int catalog_index_from_sensor_type (int type)
 949 {
 950         /* Return first matching catalog entry index for selected type */
 951         unsigned int i;
 952
 953         for (i=0; i<catalog_size; i++)
 954                 if (sensor_catalog[i].type == type)
 955                         return i;
 956
 957         return -1;
 958 }
 959
 960
 961 static void post_process_sensor_list (char poll_map[catalog_size], char trig_map[catalog_size], char event_map[catalog_size])
 962 {
 963         int illuminance_cat_index = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_ILLUMINANCE);
 964         int intensity_cat_index   = catalog_index_from_sensor_type(SENSOR_TYPE_INTERNAL_INTENSITY);
 965         int illuminance_found     = poll_map[illuminance_cat_index] || trig_map[illuminance_cat_index] || event_map[illuminance_cat_index];
 966
 967         /* If an illumimance sensor has been reported */
 968         if (illuminance_found) {
 969                 /* Hide any intensity sensors we can have for the same iio device */
 970                 poll_map [intensity_cat_index     ] = 0;
 971                 trig_map [intensity_cat_index     ] = 0;
 972                 event_map[intensity_cat_index     ] = 0;
 973                 return;
 974         }
 975 }
 976
 977
 978 void enumerate_sensors (void)
 979 {
 980         /*
 981          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
 982          * 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
 983          * and trigger-based sensor, use the trigger usage mode.
 984          */
 985         char poll_sensors[catalog_size];
 986         char trig_sensors[catalog_size];
 987         char event_sensors[catalog_size];
 988         int dev_num;
 989         unsigned int i;
 990         int trig_found;
 991
 992         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
 993                 trig_found = 0;
 994
 995                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
 996                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
 997                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
 998
 999                 /* Hide specific sensor types if appropriate */
1000                 post_process_sensor_list(poll_sensors, trig_sensors, event_sensors);
1001
1002                 for (i=0; i<catalog_size; i++) {
1003                         /* Try using events interface */
1004                         if (event_sensors[i] && !add_sensor(dev_num, i, MODE_EVENT))
1005                                 continue;
1006
1007                         /* Then trigger */
1008                         if (trig_sensors[i] && !add_sensor(dev_num, i, MODE_TRIGGER)) {
1009                                 trig_found = 1;
1010                                 continue;
1011                         }
1012
1013                         /* Try polling otherwise */
1014                         if (poll_sensors[i])
1015                                 add_sensor(dev_num, i, MODE_POLL);
1016                 }
1017
1018                 if (trig_found)
1019                         build_sensor_report_maps(dev_num);
1020         }
1021
1022         ALOGI("Discovered %d sensors\n", sensor_count);
1023
1024         /* Set up default - as well as custom - trigger names */
1025         setup_trigger_names();
1026
1027         virtual_sensors_check();
1028 }
1029
1030
1031 void delete_enumeration_data (void)
1032 {
1033         int i;
1034         for (i = 0; i < sensor_count; i++)
1035                 if (sensor[i].cal_data) {
1036                         free(sensor[i].cal_data);
1037                         sensor[i].cal_data = NULL;
1038                         sensor[i].cal_level = 0;
1039                 }
1040
1041         /* Reset sensor count */
1042         sensor_count = 0;
1043 }
1044
1045
1046 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
1047                       struct sensor_t const** list)
1048 {
1049         *list = sensor_desc;
1050         return sensor_count;
1051 }
1052