drivers/iio/common/hid-sensors/hid-sensor-attributes.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2012, Intel Corporation.
   5  */
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/time.h>
   9 #include <linux/units.h>
  10
  11 #include <linux/hid-sensor-hub.h>
  12 #include <linux/iio/iio.h>
  13
  14 static struct {
  15         u32 usage_id;
  16         int unit; /* 0 for default others from HID sensor spec */
  17         int scale_val0; /* scale, whole number */
  18         int scale_val1; /* scale, fraction in nanos */
  19 } unit_conversion[] = {
  20         {HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000},
  21         {HID_USAGE_SENSOR_ACCEL_3D,
  22                 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
  23         {HID_USAGE_SENSOR_ACCEL_3D,
  24                 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
  25
  26         {HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000},
  27         {HID_USAGE_SENSOR_GRAVITY_VECTOR,
  28                 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
  29         {HID_USAGE_SENSOR_GRAVITY_VECTOR,
  30                 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
  31
  32         {HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293},
  33         {HID_USAGE_SENSOR_GYRO_3D,
  34                 HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
  35         {HID_USAGE_SENSOR_GYRO_3D,
  36                 HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453293},
  37
  38         {HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000},
  39         {HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
  40
  41         {HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293},
  42         {HID_USAGE_SENSOR_INCLINOMETER_3D,
  43                 HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
  44         {HID_USAGE_SENSOR_INCLINOMETER_3D,
  45                 HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
  46
  47         {HID_USAGE_SENSOR_ALS, 0, 1, 0},
  48         {HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
  49
  50         {HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
  51         {HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000000},
  52
  53         {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
  54         {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
  55                 1000000, 0},
  56
  57         {HID_USAGE_SENSOR_DEVICE_ORIENTATION, 0, 1, 0},
  58
  59         {HID_USAGE_SENSOR_RELATIVE_ORIENTATION, 0, 1, 0},
  60
  61         {HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION, 0, 1, 0},
  62
  63         {HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
  64         {HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
  65
  66         {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
  67         {HID_USAGE_SENSOR_HINGE, 0, 0, 17453293},
  68         {HID_USAGE_SENSOR_HINGE, HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
  69 };
  70
  71 static void simple_div(int dividend, int divisor, int *whole,
  72                                 int *micro_frac)
  73 {
  74         int rem;
  75         int exp = 0;
  76
  77         *micro_frac = 0;
  78         if (divisor == 0) {
  79                 *whole = 0;
  80                 return;
  81         }
  82         *whole = dividend/divisor;
  83         rem = dividend % divisor;
  84         if (rem) {
  85                 while (rem <= divisor) {
  86                         rem *= 10;
  87                         exp++;
  88                 }
  89                 *micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
  90         }
  91 }
  92
  93 static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
  94 {
  95         int divisor = int_pow(10, exp);
  96
  97         *val1 = no / divisor;
  98         *val2 = no % divisor * int_pow(10, 6 - exp);
  99 }
 100
 101 /*
 102 VTF format uses exponent and variable size format.
 103 For example if the size is 2 bytes
 104 0x0067 with VTF16E14 format -> +1.03
 105 To convert just change to 0x67 to decimal and use two decimal as E14 stands
 106 for 10^-2.
 107 Negative numbers are 2's complement
 108 */
 109 static void convert_from_vtf_format(u32 value, int size, int exp,
 110                                         int *val1, int *val2)
 111 {
 112         int sign = 1;
 113
 114         if (value & BIT(size*8 - 1)) {
 115                 value =  ((1LL << (size * 8)) - value);
 116                 sign = -1;
 117         }
 118         exp = hid_sensor_convert_exponent(exp);
 119         if (exp >= 0) {
 120                 *val1 = sign * value * int_pow(10, exp);
 121                 *val2 = 0;
 122         } else {
 123                 split_micro_fraction(value, -exp, val1, val2);
 124                 if (*val1)
 125                         *val1 = sign * (*val1);
 126                 else
 127                         *val2 = sign * (*val2);
 128         }
 129 }
 130
 131 static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
 132 {
 133         int divisor;
 134         u32 value;
 135         int sign = 1;
 136
 137         if (val1 < 0 || val2 < 0)
 138                 sign = -1;
 139         exp = hid_sensor_convert_exponent(exp);
 140         if (exp < 0) {
 141                 divisor = int_pow(10, 6 + exp);
 142                 value = abs(val1) * int_pow(10, -exp);
 143                 value += abs(val2) / divisor;
 144         } else {
 145                 divisor = int_pow(10, exp);
 146                 value = abs(val1) / divisor;
 147         }
 148         if (sign < 0)
 149                 value =  ((1LL << (size * 8)) - value);
 150
 151         return value;
 152 }
 153
 154 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
 155 {
 156         s32 value = 0;
 157         int ret;
 158
 159         ret = sensor_hub_get_feature(st->hsdev,
 160                                      st->poll.report_id,
 161                                      st->poll.index, sizeof(value), &value);
 162
 163         if (ret < 0 || value < 0) {
 164                 return -EINVAL;
 165         } else {
 166                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 167                         value = value * 1000;
 168         }
 169
 170         return value;
 171 }
 172 EXPORT_SYMBOL_NS(hid_sensor_read_poll_value, "IIO_HID_ATTRIBUTES");
 173
 174 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
 175                                 int *val1, int *val2)
 176 {
 177         s32 value;
 178         int ret;
 179
 180         ret = sensor_hub_get_feature(st->hsdev,
 181                                      st->poll.report_id,
 182                                      st->poll.index, sizeof(value), &value);
 183         if (ret < 0 || value < 0) {
 184                 *val1 = *val2 = 0;
 185                 return -EINVAL;
 186         } else {
 187                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
 188                         simple_div(1000, value, val1, val2);
 189                 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 190                         simple_div(1, value, val1, val2);
 191                 else {
 192                         *val1 = *val2 = 0;
 193                         return -EINVAL;
 194                 }
 195         }
 196
 197         return IIO_VAL_INT_PLUS_MICRO;
 198 }
 199 EXPORT_SYMBOL_NS(hid_sensor_read_samp_freq_value, "IIO_HID");
 200
 201 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 202                                 int val1, int val2)
 203 {
 204         s32 value;
 205         int ret;
 206
 207         if (val1 < 0 || val2 < 0)
 208                 return -EINVAL;
 209
 210         value = val1 * HZ_PER_MHZ + val2;
 211         if (value) {
 212                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
 213                         value = NSEC_PER_SEC / value;
 214                 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 215                         value = USEC_PER_SEC / value;
 216                 else
 217                         value = 0;
 218         }
 219         ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
 220                                      st->poll.index, sizeof(value), &value);
 221         if (ret < 0 || value < 0)
 222                 return -EINVAL;
 223
 224         ret = sensor_hub_get_feature(st->hsdev,
 225                                      st->poll.report_id,
 226                                      st->poll.index, sizeof(value), &value);
 227         if (ret < 0 || value < 0)
 228                 return -EINVAL;
 229
 230         st->poll_interval = value;
 231
 232         return 0;
 233 }
 234 EXPORT_SYMBOL_NS(hid_sensor_write_samp_freq_value, "IIO_HID");
 235
 236 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
 237                                 int *val1, int *val2)
 238 {
 239         s32 value;
 240         int ret;
 241
 242         ret = sensor_hub_get_feature(st->hsdev,
 243                                      st->sensitivity.report_id,
 244                                      st->sensitivity.index, sizeof(value),
 245                                      &value);
 246         if (ret < 0 || value < 0) {
 247                 *val1 = *val2 = 0;
 248                 return -EINVAL;
 249         } else {
 250                 convert_from_vtf_format(value, st->sensitivity.size,
 251                                         st->sensitivity.unit_expo,
 252                                         val1, val2);
 253         }
 254
 255         return IIO_VAL_INT_PLUS_MICRO;
 256 }
 257 EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_value, "IIO_HID");
 258
 259 int hid_sensor_read_raw_hyst_rel_value(struct hid_sensor_common *st, int *val1,
 260                                        int *val2)
 261 {
 262         s32 value;
 263         int ret;
 264
 265         ret = sensor_hub_get_feature(st->hsdev,
 266                                      st->sensitivity_rel.report_id,
 267                                      st->sensitivity_rel.index, sizeof(value),
 268                                      &value);
 269         if (ret < 0 || value < 0) {
 270                 *val1 = *val2 = 0;
 271                 return -EINVAL;
 272         }
 273
 274         convert_from_vtf_format(value, st->sensitivity_rel.size,
 275                                 st->sensitivity_rel.unit_expo, val1, val2);
 276
 277         return IIO_VAL_INT_PLUS_MICRO;
 278 }
 279 EXPORT_SYMBOL_NS(hid_sensor_read_raw_hyst_rel_value, "IIO_HID");
 280
 281
 282 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 283                                         int val1, int val2)
 284 {
 285         s32 value;
 286         int ret;
 287
 288         if (val1 < 0 || val2 < 0)
 289                 return -EINVAL;
 290
 291         value = convert_to_vtf_format(st->sensitivity.size,
 292                                 st->sensitivity.unit_expo,
 293                                 val1, val2);
 294         ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
 295                                      st->sensitivity.index, sizeof(value),
 296                                      &value);
 297         if (ret < 0 || value < 0)
 298                 return -EINVAL;
 299
 300         ret = sensor_hub_get_feature(st->hsdev,
 301                                      st->sensitivity.report_id,
 302                                      st->sensitivity.index, sizeof(value),
 303                                      &value);
 304         if (ret < 0 || value < 0)
 305                 return -EINVAL;
 306
 307         st->raw_hystersis = value;
 308
 309         return 0;
 310 }
 311 EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_value, "IIO_HID");
 312
 313 int hid_sensor_write_raw_hyst_rel_value(struct hid_sensor_common *st,
 314                                         int val1, int val2)
 315 {
 316         s32 value;
 317         int ret;
 318
 319         if (val1 < 0 || val2 < 0)
 320                 return -EINVAL;
 321
 322         value = convert_to_vtf_format(st->sensitivity_rel.size,
 323                                 st->sensitivity_rel.unit_expo,
 324                                 val1, val2);
 325         ret = sensor_hub_set_feature(st->hsdev, st->sensitivity_rel.report_id,
 326                                      st->sensitivity_rel.index, sizeof(value),
 327                                      &value);
 328         if (ret < 0 || value < 0)
 329                 return -EINVAL;
 330
 331         ret = sensor_hub_get_feature(st->hsdev,
 332                                      st->sensitivity_rel.report_id,
 333                                      st->sensitivity_rel.index, sizeof(value),
 334                                      &value);
 335         if (ret < 0 || value < 0)
 336                 return -EINVAL;
 337
 338         st->raw_hystersis = value;
 339
 340         return 0;
 341 }
 342 EXPORT_SYMBOL_NS(hid_sensor_write_raw_hyst_rel_value, "IIO_HID");
 343
 344 /*
 345  * This fuction applies the unit exponent to the scale.
 346  * For example:
 347  * 9.806650000 ->exp:2-> val0[980]val1[665000000]
 348  * 9.000806000 ->exp:2-> val0[900]val1[80600000]
 349  * 0.174535293 ->exp:2-> val0[17]val1[453529300]
 350  * 1.001745329 ->exp:0-> val0[1]val1[1745329]
 351  * 1.001745329 ->exp:2-> val0[100]val1[174532900]
 352  * 1.001745329 ->exp:4-> val0[10017]val1[453290000]
 353  * 9.806650000 ->exp:-2-> val0[0]val1[98066500]
 354  */
 355 static void adjust_exponent_nano(int *val0, int *val1, int scale0,
 356                                   int scale1, int exp)
 357 {
 358         int divisor;
 359         int i;
 360         int x;
 361         int res;
 362         int rem;
 363
 364         if (exp > 0) {
 365                 *val0 = scale0 * int_pow(10, exp);
 366                 res = 0;
 367                 if (exp > 9) {
 368                         *val1 = 0;
 369                         return;
 370                 }
 371                 for (i = 0; i < exp; ++i) {
 372                         divisor = int_pow(10, 8 - i);
 373                         x = scale1 / divisor;
 374                         res += int_pow(10, exp - 1 - i) * x;
 375                         scale1 = scale1 % divisor;
 376                 }
 377                 *val0 += res;
 378                 *val1 = scale1 * int_pow(10, exp);
 379         } else if (exp < 0) {
 380                 exp = abs(exp);
 381                 if (exp > 9) {
 382                         *val0 = *val1 = 0;
 383                         return;
 384                 }
 385                 divisor = int_pow(10, exp);
 386                 *val0 = scale0 / divisor;
 387                 rem = scale0 % divisor;
 388                 res = 0;
 389                 for (i = 0; i < (9 - exp); ++i) {
 390                         divisor = int_pow(10, 8 - i);
 391                         x = scale1 / divisor;
 392                         res += int_pow(10, 8 - exp - i) * x;
 393                         scale1 = scale1 % divisor;
 394                 }
 395                 *val1 = rem * int_pow(10, 9 - exp) + res;
 396         } else {
 397                 *val0 = scale0;
 398                 *val1 = scale1;
 399         }
 400 }
 401
 402 int hid_sensor_format_scale(u32 usage_id,
 403                         struct hid_sensor_hub_attribute_info *attr_info,
 404                         int *val0, int *val1)
 405 {
 406         int i;
 407         int exp;
 408
 409         *val0 = 1;
 410         *val1 = 0;
 411
 412         for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
 413                 if (unit_conversion[i].usage_id == usage_id &&
 414                         unit_conversion[i].unit == attr_info->units) {
 415                         exp  = hid_sensor_convert_exponent(
 416                                                 attr_info->unit_expo);
 417                         adjust_exponent_nano(val0, val1,
 418                                         unit_conversion[i].scale_val0,
 419                                         unit_conversion[i].scale_val1, exp);
 420                         break;
 421                 }
 422         }
 423
 424         return IIO_VAL_INT_PLUS_NANO;
 425 }
 426 EXPORT_SYMBOL_NS(hid_sensor_format_scale, "IIO_HID");
 427
 428 int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
 429                                      int64_t raw_value)
 430 {
 431         return st->timestamp_ns_scale * raw_value;
 432 }
 433 EXPORT_SYMBOL_NS(hid_sensor_convert_timestamp, "IIO_HID");
 434
 435 static
 436 int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
 437                                         u32 usage_id,
 438                                         struct hid_sensor_common *st)
 439 {
 440         sensor_hub_input_get_attribute_info(hsdev,
 441                                         HID_FEATURE_REPORT, usage_id,
 442                                         HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
 443                                         &st->poll);
 444         /* Default unit of measure is milliseconds */
 445         if (st->poll.units == 0)
 446                 st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
 447
 448         st->poll_interval = -1;
 449
 450         return 0;
 451
 452 }
 453
 454 static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
 455                                                u32 usage_id,
 456                                                struct hid_sensor_common *st)
 457 {
 458         sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
 459                                             usage_id,
 460                                             HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
 461                                             &st->report_latency);
 462
 463         hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
 464                 st->report_latency.index, st->report_latency.report_id);
 465 }
 466
 467 int hid_sensor_get_report_latency(struct hid_sensor_common *st)
 468 {
 469         int ret;
 470         int value;
 471
 472         ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
 473                                      st->report_latency.index, sizeof(value),
 474                                      &value);
 475         if (ret < 0)
 476                 return ret;
 477
 478         return value;
 479 }
 480 EXPORT_SYMBOL_NS(hid_sensor_get_report_latency, "IIO_HID_ATTRIBUTES");
 481
 482 int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
 483 {
 484         return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
 485                                       st->report_latency.index,
 486                                       sizeof(latency_ms), &latency_ms);
 487 }
 488 EXPORT_SYMBOL_NS(hid_sensor_set_report_latency, "IIO_HID_ATTRIBUTES");
 489
 490 bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
 491 {
 492         return st->report_latency.index > 0 && st->report_latency.report_id > 0;
 493 }
 494 EXPORT_SYMBOL_NS(hid_sensor_batch_mode_supported, "IIO_HID_ATTRIBUTES");
 495
 496 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 497                                         u32 usage_id,
 498                                         struct hid_sensor_common *st,
 499                                         const u32 *sensitivity_addresses,
 500                                         u32 sensitivity_addresses_len)
 501 {
 502
 503         struct hid_sensor_hub_attribute_info timestamp;
 504         s32 value;
 505         int ret;
 506         int i;
 507
 508         hid_sensor_get_reporting_interval(hsdev, usage_id, st);
 509
 510         sensor_hub_input_get_attribute_info(hsdev,
 511                                         HID_FEATURE_REPORT, usage_id,
 512                                         HID_USAGE_SENSOR_PROP_REPORT_STATE,
 513                                         &st->report_state);
 514
 515         sensor_hub_input_get_attribute_info(hsdev,
 516                                         HID_FEATURE_REPORT, usage_id,
 517                                         HID_USAGE_SENSOR_PROY_POWER_STATE,
 518                                         &st->power_state);
 519
 520         st->power_state.logical_minimum = 1;
 521         st->report_state.logical_minimum = 1;
 522
 523         sensor_hub_input_get_attribute_info(hsdev,
 524                         HID_FEATURE_REPORT, usage_id,
 525                         HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
 526                          &st->sensitivity);
 527
 528         sensor_hub_input_get_attribute_info(hsdev,
 529                         HID_FEATURE_REPORT, usage_id,
 530                         HID_USAGE_SENSOR_PROP_SENSITIVITY_REL_PCT,
 531                         &st->sensitivity_rel);
 532         /*
 533          * Set Sensitivity field ids, when there is no individual modifier, will
 534          * check absolute sensitivity and relative sensitivity of data field
 535          */
 536         for (i = 0; i < sensitivity_addresses_len; i++) {
 537                 if (st->sensitivity.index < 0)
 538                         sensor_hub_input_get_attribute_info(
 539                                 hsdev, HID_FEATURE_REPORT, usage_id,
 540                                 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 541                                         sensitivity_addresses[i],
 542                                 &st->sensitivity);
 543
 544                 if (st->sensitivity_rel.index < 0)
 545                         sensor_hub_input_get_attribute_info(
 546                                 hsdev, HID_FEATURE_REPORT, usage_id,
 547                                 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_REL_PCT |
 548                                         sensitivity_addresses[i],
 549                                 &st->sensitivity_rel);
 550         }
 551
 552         st->raw_hystersis = -1;
 553
 554         sensor_hub_input_get_attribute_info(hsdev,
 555                                             HID_INPUT_REPORT, usage_id,
 556                                             HID_USAGE_SENSOR_TIME_TIMESTAMP,
 557                                             &timestamp);
 558         if (timestamp.index >= 0 && timestamp.report_id) {
 559                 int val0, val1;
 560
 561                 hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
 562                                         &timestamp, &val0, &val1);
 563                 st->timestamp_ns_scale = val0;
 564         } else
 565                 st->timestamp_ns_scale = 1000000000;
 566
 567         hid_sensor_get_report_latency_info(hsdev, usage_id, st);
 568
 569         hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x %x:%x\n",
 570                 st->poll.index, st->poll.report_id,
 571                 st->report_state.index, st->report_state.report_id,
 572                 st->power_state.index, st->power_state.report_id,
 573                 st->sensitivity.index, st->sensitivity.report_id,
 574                 timestamp.index, timestamp.report_id);
 575
 576         ret = sensor_hub_get_feature(hsdev,
 577                                 st->power_state.report_id,
 578                                 st->power_state.index, sizeof(value), &value);
 579         if (ret < 0)
 580                 return ret;
 581         if (value < 0)
 582                 return -EINVAL;
 583
 584         return 0;
 585 }
 586 EXPORT_SYMBOL_NS(hid_sensor_parse_common_attributes, "IIO_HID");
 587
 588 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 589 MODULE_DESCRIPTION("HID Sensor common attribute processing");
 590 MODULE_LICENSE("GPL");