enumeration.c

   1 /*
   2  * Copyright (C) 2014-2015 Intel Corporation.
   3  */
   4
   5 #include <ctype.h>
   6 #include <dirent.h>
   7 #include <stdlib.h>
   8 #include <fcntl.h>
   9 #include <utils/Log.h>
  10 #include <hardware/sensors.h>
  11 #include "enumeration.h"
  12 #include "description.h"
  13 #include "utils.h"
  14 #include "transform.h"
  15 #include "description.h"
  16 #include "control.h"
  17 #include "calibration.h"
  18
  19 /*
  20  * This table maps syfs entries in scan_elements directories to sensor types,
  21  * and will also be used to determine other sysfs names as well as the iio
  22  * device number associated to a specific sensor.
  23  */
  24
  25  /*
  26   * We duplicate entries for the uncalibrated types after their respective base
  27   * sensor. This is because all sensor entries must have an associated catalog entry
  28   * and also because when only the uncal sensor is active it needs to take it's data
  29   * from the same iio device as the base one.
  30   */
  31
  32 sensor_catalog_entry_t sensor_catalog[] = {
  33         {
  34                 .tag            = "accel",
  35                 .type           = SENSOR_TYPE_ACCELEROMETER,
  36                 .num_channels   = 3,
  37                 .is_virtual     = 0,
  38                 .channel = {
  39                         { DECLARE_NAMED_CHANNEL("accel", "x") },
  40                         { DECLARE_NAMED_CHANNEL("accel", "y") },
  41                         { DECLARE_NAMED_CHANNEL("accel", "z") },
  42                 },
  43         },
  44         {
  45                 .tag            = "anglvel",
  46                 .type           = SENSOR_TYPE_GYROSCOPE,
  47                 .num_channels   = 3,
  48                 .is_virtual     = 0,
  49                 .channel = {
  50                         { DECLARE_NAMED_CHANNEL("anglvel", "x") },
  51                         { DECLARE_NAMED_CHANNEL("anglvel", "y") },
  52                         { DECLARE_NAMED_CHANNEL("anglvel", "z") },
  53                 },
  54         },
  55         {
  56                 .tag            = "magn",
  57                 .type           = SENSOR_TYPE_MAGNETIC_FIELD,
  58                 .num_channels   = 3,
  59                 .is_virtual     = 0,
  60                 .channel = {
  61                         { DECLARE_NAMED_CHANNEL("magn", "x") },
  62                         { DECLARE_NAMED_CHANNEL("magn", "y") },
  63                         { DECLARE_NAMED_CHANNEL("magn", "z") },
  64                 },
  65         },
  66         {
  67                 .tag            = "intensity",
  68                 .type           = SENSOR_TYPE_LIGHT,
  69                 .num_channels   = 1,
  70                 .is_virtual     = 0,
  71                 .channel = {
  72                         { DECLARE_NAMED_CHANNEL("intensity", "both") },
  73                 },
  74         },
  75         {
  76                 .tag            = "illuminance",
  77                 .type           = SENSOR_TYPE_LIGHT,
  78                 .num_channels   = 1,
  79                 .is_virtual     = 0,
  80                 .channel = {
  81                         { DECLARE_GENERIC_CHANNEL("illuminance") },
  82                 },
  83         },
  84         {
  85                 .tag            = "incli",
  86                 .type           = SENSOR_TYPE_ORIENTATION,
  87                 .num_channels   = 3,
  88                 .is_virtual     = 0,
  89                 .channel = {
  90                         { DECLARE_NAMED_CHANNEL("incli", "x") },
  91                         { DECLARE_NAMED_CHANNEL("incli", "y") },
  92                         { DECLARE_NAMED_CHANNEL("incli", "z") },
  93                 },
  94         },
  95         {
  96                 .tag            = "rot",
  97                 .type           = SENSOR_TYPE_ROTATION_VECTOR,
  98                 .num_channels   = 4,
  99                 .is_virtual     = 0,
 100                 .channel = {
 101                         { DECLARE_NAMED_CHANNEL("rot", "quat_x") },
 102                         { DECLARE_NAMED_CHANNEL("rot", "quat_y") },
 103                         { DECLARE_NAMED_CHANNEL("rot", "quat_z") },
 104                         { DECLARE_NAMED_CHANNEL("rot", "quat_w") },
 105                 },
 106         },
 107         {
 108                 .tag            = "temp",
 109                 .type           = SENSOR_TYPE_AMBIENT_TEMPERATURE,
 110                 .num_channels   = 1,
 111                 .is_virtual     = 0,
 112                 .channel = {
 113                         { DECLARE_GENERIC_CHANNEL("temp") },
 114                 },
 115         },
 116         {
 117                 .tag            = "proximity",
 118                 .type           = SENSOR_TYPE_PROXIMITY,
 119                 .num_channels   = 1,
 120                 .is_virtual     = 0,
 121                 .channel = {
 122                         { DECLARE_GENERIC_CHANNEL("proximity") },
 123                 },
 124         },
 125         {
 126                 .tag            = "",
 127                 .type           = SENSOR_TYPE_GYROSCOPE_UNCALIBRATED,
 128                 .num_channels   = 0,
 129                 .is_virtual     = 1,
 130                 .channel = {
 131                         { DECLARE_GENERIC_CHANNEL("") },
 132                 },
 133
 134         },
 135         {
 136                 .tag            = "",
 137                 .type           = SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
 138                 .num_channels   = 0,
 139                 .is_virtual     = 1,
 140                 .channel = {
 141                         { DECLARE_GENERIC_CHANNEL("") },
 142                 },
 143         },
 144         {
 145                 .tag            = "steps",
 146                 .type           = SENSOR_TYPE_STEP_COUNTER,
 147                 .num_channels   = 1,
 148                 .is_virtual     = 0,
 149                 .channel = {
 150                         { DECLARE_GENERIC_CHANNEL("steps") },
 151                 },
 152         },
 153         {
 154                 .tag            = "steps",
 155                 .type           = SENSOR_TYPE_STEP_DETECTOR,
 156                 .num_channels   = 1,
 157                 .is_virtual     = 0,
 158                 .channel = {
 159                         {
 160                                 DECLARE_VOID_CHANNEL("steps")
 161                                 .num_events = 1,
 162                                 .event = {
 163                                         { DECLARE_NAMED_EVENT("steps", "change") },
 164                                 },
 165                         },
 166                 },
 167         },
 168 };
 169
 170 #define CATALOG_SIZE    ARRAY_SIZE(sensor_catalog)
 171
 172 /* ACPI PLD (physical location of device) definitions, as used with sensors */
 173
 174 #define PANEL_FRONT     4
 175 #define PANEL_BACK      5
 176
 177 /* We equate sensor handles to indices in these tables */
 178
 179 struct sensor_t sensor_desc[MAX_SENSORS];       /* Android-level descriptors */
 180 sensor_info_t   sensor[MAX_SENSORS];            /* Internal descriptors      */
 181 int             sensor_count;                   /* Detected sensors          */
 182
 183
 184 /* if the sensor has an _en attribute, we need to enable it */
 185 int get_needs_enable(int dev_num, const char *tag)
 186 {
 187         char sysfs_path[PATH_MAX];
 188         int fd;
 189
 190         sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
 191
 192         fd = open(sysfs_path, O_RDWR);
 193         if (fd == -1)
 194                 return 0;
 195
 196         close(fd);
 197         return 1;
 198 }
 199
 200 static void setup_properties_from_pld (int s, int panel, int rotation,
 201                                        int num_channels)
 202 {
 203         /*
 204          * Generate suitable order and opt_scale directives from the PLD panel
 205          * and rotation codes we got. This can later be superseded by the usual
 206          * properties if necessary. Eventually we'll need to replace these
 207          * mechanisms by a less convoluted one, such as a 3x3 placement matrix.
 208          */
 209
 210         int x = 1;
 211         int y = 1;
 212         int z = 1;
 213         int xy_swap = 0;
 214         int angle = rotation * 45;
 215
 216         /* Only deal with 3 axis chips for now */
 217         if (num_channels < 3)
 218                 return;
 219
 220         if (panel == PANEL_BACK) {
 221                 /* Chip placed on the back panel ; negate x and z */
 222                 x = -x;
 223                 z = -z;
 224         }
 225
 226         switch (angle) {
 227                 case 90: /* 90° clockwise: negate y then swap x,y */
 228                         xy_swap = 1;
 229                         y = -y;
 230                         break;
 231
 232                 case 180: /* Upside down: negate x and y */
 233                         x = -x;
 234                         y = -y;
 235                         break;
 236
 237                 case 270: /* 90° counter clockwise: negate x then swap x,y */
 238                         x = -x;
 239                         xy_swap = 1;
 240                         break;
 241         }
 242
 243         if (xy_swap) {
 244                 sensor[s].order[0] = 1;
 245                 sensor[s].order[1] = 0;
 246                 sensor[s].order[2] = 2;
 247                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 248         }
 249
 250         sensor[s].channel[0].opt_scale = x;
 251         sensor[s].channel[1].opt_scale = y;
 252         sensor[s].channel[2].opt_scale = z;
 253 }
 254
 255
 256 static int is_valid_pld (int panel, int rotation)
 257 {
 258         if (panel != PANEL_FRONT && panel != PANEL_BACK) {
 259                 ALOGW("Unhandled PLD panel spec: %d\n", panel);
 260                 return 0;
 261         }
 262
 263         /* Only deal with 90° rotations for now */
 264         if (rotation < 0 || rotation > 7 || (rotation & 1)) {
 265                 ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
 266                 return 0;
 267         }
 268
 269         return 1;
 270 }
 271
 272
 273 static int read_pld_from_properties (int s, int* panel, int* rotation)
 274 {
 275         int p, r;
 276
 277         if (sensor_get_prop(s, "panel", &p))
 278                 return -1;
 279
 280         if (sensor_get_prop(s, "rotation", &r))
 281                 return -1;
 282
 283         if (!is_valid_pld(p, r))
 284                 return -1;
 285
 286         *panel = p;
 287         *rotation = r;
 288
 289         ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
 290
 291         return 0;
 292 }
 293
 294
 295 static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
 296 {
 297         char sysfs_path[PATH_MAX];
 298         int p,r;
 299
 300         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
 301
 302         if (sysfs_read_int(sysfs_path, &p))
 303                 return -1;
 304
 305         sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
 306
 307         if (sysfs_read_int(sysfs_path, &r))
 308                 return -1;
 309
 310         if (!is_valid_pld(p, r))
 311                 return -1;
 312
 313         *panel = p;
 314         *rotation = r;
 315
 316         ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
 317
 318         return 0;
 319 }
 320
 321
 322 static void decode_placement_information (int dev_num, int num_channels, int s)
 323 {
 324         /*
 325          * See if we have optional "physical location of device" ACPI tags.
 326          * We're only interested in panel and rotation specifiers. Use the
 327          * .panel and .rotation properties in priority, and the actual ACPI
 328          * values as a second source.
 329          */
 330
 331         int panel;
 332         int rotation;
 333
 334         if (read_pld_from_properties(s, &panel, &rotation) &&
 335                 read_pld_from_sysfs(s, dev_num, &panel, &rotation))
 336                         return; /* No PLD data available */
 337
 338         /* Map that to field ordering and scaling mechanisms */
 339         setup_properties_from_pld(s, panel, rotation, num_channels);
 340 }
 341
 342
 343 static void populate_descriptors (int s, int sensor_type)
 344 {
 345         int32_t         min_delay_us;
 346         max_delay_t     max_delay_us;
 347
 348         /* Initialize Android-visible descriptor */
 349         sensor_desc[s].name             = sensor_get_name(s);
 350         sensor_desc[s].vendor           = sensor_get_vendor(s);
 351         sensor_desc[s].version          = sensor_get_version(s);
 352         sensor_desc[s].handle           = s;
 353         sensor_desc[s].type             = sensor_type;
 354
 355         sensor_desc[s].maxRange         = sensor_get_max_range(s);
 356         sensor_desc[s].resolution       = sensor_get_resolution(s);
 357         sensor_desc[s].power            = sensor_get_power(s);
 358         sensor_desc[s].stringType       = sensor_get_string_type(s);
 359
 360         /* None of our supported sensors requires a special permission */
 361         sensor_desc[s].requiredPermission = "";
 362
 363         sensor_desc[s].flags = sensor_get_flags(s);
 364         sensor_desc[s].minDelay = sensor_get_min_delay(s);
 365         sensor_desc[s].maxDelay = sensor_get_max_delay(s);
 366
 367         ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%d) flags(%2.2x)\n",
 368                 s, sensor[s].friendly_name, sensor_desc[s].type,
 369                 sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
 370                 sensor_desc[s].flags);
 371
 372         /* We currently do not implement batching */
 373         sensor_desc[s].fifoReservedEventCount = 0;
 374         sensor_desc[s].fifoMaxEventCount = 0;
 375
 376         min_delay_us = sensor_desc[s].minDelay;
 377         max_delay_us = sensor_desc[s].maxDelay;
 378
 379         sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
 380         sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
 381 }
 382
 383
 384 static void add_virtual_sensor (int catalog_index)
 385 {
 386         int s;
 387         int sensor_type;
 388
 389         if (sensor_count == MAX_SENSORS) {
 390                 ALOGE("Too many sensors!\n");
 391                 return;
 392         }
 393
 394         sensor_type = sensor_catalog[catalog_index].type;
 395
 396         s = sensor_count;
 397
 398         sensor[s].is_virtual = 1;
 399         sensor[s].catalog_index = catalog_index;
 400         sensor[s].type          = sensor_type;
 401
 402         populate_descriptors(s, sensor_type);
 403
 404         /* Initialize fields related to sysfs reads offloading */
 405         sensor[s].thread_data_fd[0]  = -1;
 406         sensor[s].thread_data_fd[1]  = -1;
 407         sensor[s].acquisition_thread = -1;
 408
 409         sensor_count++;
 410 }
 411
 412
 413 static void add_sensor (int dev_num, int catalog_index, int mode)
 414 {
 415         int s;
 416         int sensor_type;
 417         int retval;
 418         char sysfs_path[PATH_MAX];
 419         const char* prefix;
 420         float scale;
 421         int c;
 422         float opt_scale;
 423         const char* ch_name;
 424         int num_channels;
 425         char suffix[MAX_NAME_SIZE + 8];
 426         int calib_bias;
 427
 428         if (sensor_count == MAX_SENSORS) {
 429                 ALOGE("Too many sensors!\n");
 430                 return;
 431         }
 432
 433         sensor_type = sensor_catalog[catalog_index].type;
 434
 435         /*
 436          * At this point we could check that the expected sysfs attributes are
 437          * present ; that would enable having multiple catalog entries with the
 438          * same sensor type, accomodating different sets of sysfs attributes.
 439          */
 440
 441         s = sensor_count;
 442
 443         sensor[s].dev_num       = dev_num;
 444         sensor[s].catalog_index = catalog_index;
 445         sensor[s].type          = sensor_type;
 446         sensor[s].mode          = mode;
 447
 448         num_channels = sensor_catalog[catalog_index].num_channels;
 449
 450         if (mode == MODE_POLL)
 451                 sensor[s].num_channels = 0;
 452         else
 453                 sensor[s].num_channels = num_channels;
 454
 455         prefix = sensor_catalog[catalog_index].tag;
 456
 457         /*
 458          * receiving the illumination sensor calibration inputs from
 459          * the Android properties and setting it within sysfs
 460          */
 461         if (sensor_type == SENSOR_TYPE_LIGHT) {
 462                 retval = sensor_get_illumincalib(s);
 463                 if (retval > 0) {
 464                         sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
 465                         sysfs_write_int(sysfs_path, retval);
 466                 }
 467         }
 468
 469         /*
 470          * See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
 471          * 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
 472          * relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
 473          */
 474
 475         if (num_channels) {
 476                 for (c = 0; c < num_channels; c++) {
 477                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 478                         sprintf(suffix, "%s.calib_bias", ch_name);
 479                         if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
 480                                 sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
 481                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
 482                                 sysfs_write_int(sysfs_path, calib_bias);
 483                         }
 484                 }
 485         } else
 486                 if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
 487                                 sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
 488                                 sysfs_write_int(sysfs_path, calib_bias);
 489                         }
 490
 491         /* Read name attribute, if available */
 492         sprintf(sysfs_path, NAME_PATH, dev_num);
 493         sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
 494
 495         /* See if we have general offsets and scale values for this sensor */
 496
 497         sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
 498         sysfs_read_float(sysfs_path, &sensor[s].offset);
 499
 500         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 501         if (!sensor_get_fl_prop(s, "scale", &scale)) {
 502                 /*
 503                  * There is a chip preferred scale specified,
 504                  * so try to store it in sensor's scale file
 505                  */
 506                 if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
 507                         ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
 508                         /* Store failed, try to store the scale into channel specific file */
 509                         for (c = 0; c < num_channels; c++)
 510                         {
 511                                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 512                                         sensor_catalog[catalog_index].channel[c].scale_path);
 513                                 if (sysfs_write_float(sysfs_path, scale) == -1)
 514                                         ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
 515                         }
 516                 }
 517         }
 518
 519         sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
 520         if (!sysfs_read_float(sysfs_path, &scale)) {
 521                 sensor[s].scale = scale;
 522                 ALOGV("Scale path:%s scale:%g dev_num:%d\n",
 523                                         sysfs_path, scale, dev_num);
 524         } else {
 525                 sensor[s].scale = 1;
 526
 527                 /* Read channel specific scale if any*/
 528                 for (c = 0; c < num_channels; c++)
 529                 {
 530                         sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 531                            sensor_catalog[catalog_index].channel[c].scale_path);
 532
 533                         if (!sysfs_read_float(sysfs_path, &scale)) {
 534                                 sensor[s].channel[c].scale = scale;
 535                                 sensor[s].scale = 0;
 536
 537                                 ALOGV(  "Scale path:%s "
 538                                         "channel scale:%g dev_num:%d\n",
 539                                         sysfs_path, scale, dev_num);
 540                         }
 541                 }
 542         }
 543
 544         /* Set default scaling - if num_channels is zero, we have one channel */
 545
 546         sensor[s].channel[0].opt_scale = 1;
 547
 548         for (c = 1; c < num_channels; c++)
 549                 sensor[s].channel[c].opt_scale = 1;
 550
 551         for (c = 0; c < num_channels; c++) {
 552                 /* Check the presence of the channel's input_path */
 553                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 554                         sensor_catalog[catalog_index].channel[c].input_path);
 555                 sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
 556                 /* Check the presence of the channel's raw_path */
 557                 sprintf(sysfs_path, BASE_PATH "%s", dev_num,
 558                         sensor_catalog[catalog_index].channel[c].raw_path);
 559                 sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
 560         }
 561
 562         /* Read ACPI _PLD attributes for this sensor, if there are any */
 563         decode_placement_information(dev_num, num_channels, s);
 564
 565         /*
 566          * See if we have optional correction scaling factors for each of the
 567          * channels of this sensor. These would be expressed using properties
 568          * like iio.accel.y.opt_scale = -1. In case of a single channel we also
 569          * support things such as iio.temp.opt_scale = -1. Note that this works
 570          * for all types of sensors, and whatever transform is selected, on top
 571          * of any previous conversions.
 572          */
 573
 574         if (num_channels) {
 575                 for (c = 0; c < num_channels; c++) {
 576                         ch_name = sensor_catalog[catalog_index].channel[c].name;
 577                         sprintf(suffix, "%s.opt_scale", ch_name);
 578                         if (!sensor_get_fl_prop(s, suffix, &opt_scale))
 579                                 sensor[s].channel[c].opt_scale = opt_scale;
 580                 }
 581         } else
 582                 if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
 583                         sensor[s].channel[0].opt_scale = opt_scale;
 584
 585         populate_descriptors(s, sensor_type);
 586
 587         /* Populate the quirks array */
 588         sensor_get_quirks(s);
 589
 590         if (sensor[s].internal_name[0] == '\0') {
 591                 /*
 592                  * In case the kernel-mode driver doesn't expose a name for
 593                  * the iio device, use (null)-dev%d as the trigger name...
 594                  * This can be considered a kernel-mode iio driver bug.
 595                  */
 596                 ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
 597                 strcpy(sensor[s].internal_name, "(null)");
 598         }
 599
 600         switch (sensor_type) {
 601                 case SENSOR_TYPE_GYROSCOPE:
 602                         sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
 603                         break;
 604
 605                 case SENSOR_TYPE_MAGNETIC_FIELD:
 606                         sensor[s].cal_data = malloc(sizeof(compass_cal_t));
 607                         break;
 608         }
 609
 610         sensor[s].max_cal_level = sensor_get_cal_steps(s);
 611
 612         /* Select one of the available sensor sample processing styles */
 613         select_transform(s);
 614
 615         /* Initialize fields related to sysfs reads offloading */
 616         sensor[s].thread_data_fd[0]  = -1;
 617         sensor[s].thread_data_fd[1]  = -1;
 618         sensor[s].acquisition_thread = -1;
 619
 620         /* Check if we have a special ordering property on this sensor */
 621         if (sensor_get_order(s, sensor[s].order))
 622                 sensor[s].quirks |= QUIRK_FIELD_ORDERING;
 623
 624         sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
 625
 626         sensor_count++;
 627 }
 628
 629
 630 static void discover_sensors (int dev_num, char *sysfs_base_path, char map[CATALOG_SIZE],
 631                               void (*discover_sensor)(int, char*, char*))
 632 {
 633         char sysfs_dir[PATH_MAX];
 634         DIR *dir;
 635         struct dirent *d;
 636         unsigned int i;
 637
 638         memset(map, 0, CATALOG_SIZE);
 639
 640         snprintf(sysfs_dir, sizeof(sysfs_dir), sysfs_base_path, dev_num);
 641
 642         dir = opendir(sysfs_dir);
 643         if (!dir) {
 644                 return;
 645         }
 646
 647         /* Enumerate entries in this iio device's base folder */
 648
 649         while ((d = readdir(dir))) {
 650                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 651                         continue;
 652
 653                 /* If the name matches a catalog entry, flag it */
 654                 for (i = 0; i < CATALOG_SIZE; i++) {
 655
 656                         /* No discovery for virtual sensors */
 657                         if (sensor_catalog[i].is_virtual)
 658                                 continue;
 659                         discover_sensor(i, d->d_name, map);
 660                 }
 661         }
 662
 663         closedir(dir);
 664 }
 665
 666 static void check_poll_sensors (int i, char *sysfs_file, char map[CATALOG_SIZE])
 667 {
 668         int c;
 669
 670         for (c = 0; c < sensor_catalog[i].num_channels; c++)
 671                 if (!strcmp(sysfs_file, sensor_catalog[i].channel[c].raw_path) ||
 672                     !strcmp(sysfs_file, sensor_catalog[i].channel[c].input_path)) {
 673                         map[i] = 1;
 674                         break;
 675                 }
 676 }
 677 static void check_trig_sensors (int i, char *sysfs_file, char map[CATALOG_SIZE])
 678 {
 679
 680         if (!strcmp(sysfs_file, sensor_catalog[i].channel[0].en_path)) {
 681                 map[i] = 1;
 682                 return;
 683         }
 684 }
 685
 686 static void check_event_sensors(int i, char *sysfs_file, char map[CATALOG_SIZE])
 687 {
 688         int j, k;
 689
 690         for (j = 0; j < sensor_catalog[i].num_channels; j++)
 691                 for (k = 0; k < sensor_catalog[i].channel[j].num_events; k++)
 692                         if (!strcmp(sysfs_file, sensor_catalog[i].channel[j].event[k].ev_en_path)) {
 693                                 map[i] = 1;
 694                                 return ;
 695                         }
 696 }
 697
 698 static void virtual_sensors_check (void)
 699 {
 700         int i;
 701         int has_acc = 0;
 702         int has_gyr = 0;
 703         int has_mag = 0;
 704         int has_rot = 0;
 705         int has_ori = 0;
 706         int catalog_size = CATALOG_SIZE;
 707         int gyro_cal_idx = 0;
 708         int magn_cal_idx = 0;
 709
 710         for (i=0; i<sensor_count; i++)
 711                 switch (sensor[i].type) {
 712                         case SENSOR_TYPE_ACCELEROMETER:
 713                                 has_acc = 1;
 714                                 break;
 715                         case SENSOR_TYPE_GYROSCOPE:
 716                                 has_gyr = 1;
 717                                 gyro_cal_idx = i;
 718                                 break;
 719                         case SENSOR_TYPE_MAGNETIC_FIELD:
 720                                 has_mag = 1;
 721                                 magn_cal_idx = i;
 722                                 break;
 723                         case SENSOR_TYPE_ORIENTATION:
 724                                 has_ori = 1;
 725                                 break;
 726                         case SENSOR_TYPE_ROTATION_VECTOR:
 727                                 has_rot = 1;
 728                                 break;
 729                 }
 730
 731         for (i=0; i<catalog_size; i++)
 732                 switch (sensor_catalog[i].type) {
 733                         /*
 734                         * If we have accel + gyro + magn but no rotation vector sensor,
 735                         * SensorService replaces the HAL provided orientation sensor by the
 736                         * AOSP version... provided we report one. So initialize a virtual
 737                         * orientation sensor with zero values, which will get replaced. See:
 738                         * frameworks/native/services/sensorservice/SensorService.cpp, looking
 739                         * for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
 740                         * back to mUserSensorList.add instead of replaceAt, but accommodate it.
 741                         */
 742
 743                         case SENSOR_TYPE_ORIENTATION:
 744                                 if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
 745                                         add_sensor(0, i, MODE_POLL);
 746                                 break;
 747                         case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
 748                                 if (has_gyr) {
 749                                         sensor[sensor_count].base_count = 1;
 750                                         sensor[sensor_count].base[0] = gyro_cal_idx;
 751                                         add_virtual_sensor(i);
 752                                 }
 753                                 break;
 754                         case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
 755                                 if (has_mag) {
 756                                         sensor[sensor_count].base_count = 1;
 757                                         sensor[sensor_count].base[0] = magn_cal_idx;
 758                                         add_virtual_sensor(i);
 759                                 }
 760                                 break;
 761                         default:
 762                         break;
 763                 }
 764 }
 765
 766
 767 static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
 768                                  int sensor_name_len)
 769 {
 770         /*
 771          * A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
 772          *  and select it if it is so. The format is something like sensor_name-dev0.
 773          */
 774
 775         const char *suffix = trigger_name + sensor_name_len + 1;
 776
 777         /* dev is the default, and lowest priority; no need to update */
 778         if (!memcmp(suffix, "dev", 3))
 779                 return;
 780
 781         /* If we found any-motion trigger, record it */
 782
 783         if (!memcmp(suffix, "any-motion-", 11)) {
 784                 strcpy(sensor[s].motion_trigger_name, trigger_name);
 785                 return;
 786         }
 787
 788         /*
 789          * 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
 790          * of the trigger to use with this sensor.
 791          */
 792         strcpy(sensor[s].init_trigger_name, trigger_name);
 793 }
 794
 795
 796 static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE])
 797 {
 798         /*
 799          * Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
 800          * 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
 801          * when enabling this sensor.
 802          */
 803
 804         int s;
 805         int dev_num;
 806         int len;
 807         char* cursor;
 808         int sensor_name_len;
 809
 810         /*
 811          * First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
 812          * to be this number, so perform a few checks.
 813          */
 814         len = strnlen(name, MAX_NAME_SIZE);
 815
 816         if (len < 2)
 817                 return;
 818
 819         cursor = name + len - 1;
 820
 821         if (!isdigit(*cursor))
 822                 return;
 823
 824         while (len && isdigit(*cursor)) {
 825                 len--;
 826                 cursor--;
 827         }
 828
 829         dev_num = atoi(cursor+1);
 830
 831         /* See if that matches a sensor */
 832         for (s=0; s<sensor_count; s++)
 833                 if (sensor[s].dev_num == dev_num) {
 834
 835                         sensor_name_len = strlen(sensor[s].internal_name);
 836
 837                         if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
 838                                 /* Switch to new trigger if appropriate */
 839                                 propose_new_trigger(s, name, sensor_name_len);
 840                 }
 841 }
 842
 843
 844 static void setup_trigger_names (void)
 845 {
 846         char filename[PATH_MAX];
 847         char buf[MAX_NAME_SIZE];
 848         int s;
 849         int trigger;
 850         int ret;
 851
 852         /* By default, use the name-dev convention that most drivers use */
 853         for (s=0; s<sensor_count; s++)
 854                 snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
 855
 856         /* Now have a look to /sys/bus/iio/devices/triggerX entries */
 857
 858         for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
 859
 860                 snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH,trigger);
 861
 862                 ret = sysfs_read_str(filename, buf, sizeof(buf));
 863
 864                 if (ret < 0)
 865                         break;
 866
 867                 /* Record initial and any-motion triggers names */
 868                 update_sensor_matching_trigger_name(buf);
 869         }
 870
 871         /*
 872          * Certain drivers expose only motion triggers even though they should be continous. For these, use the default trigger name as the motion
 873          * trigger. The code generating intermediate events is dependent on motion_trigger_name being set to a non empty string.
 874          */
 875
 876         for (s=0; s<sensor_count; s++)
 877                 if ((sensor[s].quirks & QUIRK_TERSE_DRIVER) && sensor[s].motion_trigger_name[0] == '\0')
 878                         strcpy(sensor[s].motion_trigger_name, sensor[s].init_trigger_name);
 879
 880         for (s=0; s<sensor_count; s++)
 881                 if (sensor[s].mode == MODE_TRIGGER) {
 882                         ALOGI("Sensor %d (%s) default trigger: %s\n", s, sensor[s].friendly_name, sensor[s].init_trigger_name);
 883                         if (sensor[s].motion_trigger_name[0])
 884                                 ALOGI("Sensor %d (%s) motion trigger: %s\n", s, sensor[s].friendly_name, sensor[s].motion_trigger_name);
 885                 }
 886 }
 887
 888 void enumerate_sensors (void)
 889 {
 890         /*
 891          * Discover supported sensors and allocate control structures for them. Multiple sensors can potentially rely on a single iio device (each
 892          * 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
 893          * and trigger-based sensor, use the trigger usage mode.
 894          */
 895         char poll_sensors[CATALOG_SIZE];
 896         char trig_sensors[CATALOG_SIZE];
 897         char event_sensors[CATALOG_SIZE];
 898         int dev_num;
 899         unsigned int i;
 900         int trig_found;
 901
 902         for (dev_num=0; dev_num<MAX_DEVICES; dev_num++) {
 903                 trig_found = 0;
 904
 905                 discover_sensors(dev_num, BASE_PATH, poll_sensors, check_poll_sensors);
 906                 discover_sensors(dev_num, CHANNEL_PATH, trig_sensors, check_trig_sensors);
 907                 discover_sensors(dev_num, EVENTS_PATH, event_sensors, check_event_sensors);
 908
 909                 for (i=0; i<CATALOG_SIZE; i++) {
 910                         if (event_sensors[i]) {
 911                                 add_sensor(dev_num, i, MODE_EVENT);
 912                                 continue;
 913                         }
 914                         if (trig_sensors[i]) {
 915                                 add_sensor(dev_num, i, MODE_TRIGGER);
 916                                 trig_found = 1;
 917                                 continue;
 918                         }
 919                         if (poll_sensors[i]) {
 920                                 add_sensor(dev_num, i, MODE_POLL);
 921                                 continue;
 922                         }
 923                 }
 924
 925                 if (trig_found)
 926                         build_sensor_report_maps(dev_num);
 927         }
 928
 929         ALOGI("Discovered %d sensors\n", sensor_count);
 930
 931         /* Set up default - as well as custom - trigger names */
 932         setup_trigger_names();
 933
 934         virtual_sensors_check();
 935 }
 936
 937
 938 void delete_enumeration_data (void)
 939 {
 940         int i;
 941         for (i = 0; i < sensor_count; i++)
 942                 if (sensor[i].cal_data) {
 943                         free(sensor[i].cal_data);
 944                         sensor[i].cal_data = NULL;
 945                         sensor[i].cal_level = 0;
 946                 }
 947
 948         /* Reset sensor count */
 949         sensor_count = 0;
 950 }
 951
 952
 953 int get_sensors_list (__attribute__((unused)) struct sensors_module_t* module,
 954                       struct sensor_t const** list)
 955 {
 956         *list = sensor_desc;
 957         return sensor_count;
 958 }
 959