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

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  */
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/irq.h>
  24 #include <linux/slab.h>
  25 #include <linux/hid-sensor-hub.h>
  26 #include <linux/iio/iio.h>
  27 #include <linux/iio/sysfs.h>
  28
  29 static struct {
  30         u32 usage_id;
  31         int unit; /* 0 for default others from HID sensor spec */
  32         int scale_val0; /* scale, whole number */
  33         int scale_val1; /* scale, fraction in nanos */
  34 } unit_conversion[] = {
  35         {HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650000},
  36         {HID_USAGE_SENSOR_ACCEL_3D,
  37                 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
  38         {HID_USAGE_SENSOR_ACCEL_3D,
  39                 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
  40
  41         {HID_USAGE_SENSOR_GRAVITY_VECTOR, 0, 9, 806650000},
  42         {HID_USAGE_SENSOR_GRAVITY_VECTOR,
  43                 HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
  44         {HID_USAGE_SENSOR_GRAVITY_VECTOR,
  45                 HID_USAGE_SENSOR_UNITS_G, 9, 806650000},
  46
  47         {HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453293},
  48         {HID_USAGE_SENSOR_GYRO_3D,
  49                 HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
  50         {HID_USAGE_SENSOR_GYRO_3D,
  51                 HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453293},
  52
  53         {HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000000},
  54         {HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
  55
  56         {HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453293},
  57         {HID_USAGE_SENSOR_INCLINOMETER_3D,
  58                 HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453293},
  59         {HID_USAGE_SENSOR_INCLINOMETER_3D,
  60                 HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
  61
  62         {HID_USAGE_SENSOR_ALS, 0, 1, 0},
  63         {HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
  64
  65         {HID_USAGE_SENSOR_PRESSURE, 0, 100, 0},
  66         {HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 0, 1000000},
  67
  68         {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
  69         {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
  70                 1000000, 0},
  71
  72         {HID_USAGE_SENSOR_DEVICE_ORIENTATION, 0, 1, 0},
  73
  74         {HID_USAGE_SENSOR_RELATIVE_ORIENTATION, 0, 1, 0},
  75
  76         {HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION, 0, 1, 0},
  77
  78         {HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
  79         {HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
  80
  81         {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
  82 };
  83
  84 static int pow_10(unsigned power)
  85 {
  86         int i;
  87         int ret = 1;
  88         for (i = 0; i < power; ++i)
  89                 ret = ret * 10;
  90
  91         return ret;
  92 }
  93
  94 static void simple_div(int dividend, int divisor, int *whole,
  95                                 int *micro_frac)
  96 {
  97         int rem;
  98         int exp = 0;
  99
 100         *micro_frac = 0;
 101         if (divisor == 0) {
 102                 *whole = 0;
 103                 return;
 104         }
 105         *whole = dividend/divisor;
 106         rem = dividend % divisor;
 107         if (rem) {
 108                 while (rem <= divisor) {
 109                         rem *= 10;
 110                         exp++;
 111                 }
 112                 *micro_frac = (rem / divisor) * pow_10(6-exp);
 113         }
 114 }
 115
 116 static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
 117 {
 118         *val1 = no/pow_10(exp);
 119         *val2 = no%pow_10(exp) * pow_10(6-exp);
 120 }
 121
 122 /*
 123 VTF format uses exponent and variable size format.
 124 For example if the size is 2 bytes
 125 0x0067 with VTF16E14 format -> +1.03
 126 To convert just change to 0x67 to decimal and use two decimal as E14 stands
 127 for 10^-2.
 128 Negative numbers are 2's complement
 129 */
 130 static void convert_from_vtf_format(u32 value, int size, int exp,
 131                                         int *val1, int *val2)
 132 {
 133         int sign = 1;
 134
 135         if (value & BIT(size*8 - 1)) {
 136                 value =  ((1LL << (size * 8)) - value);
 137                 sign = -1;
 138         }
 139         exp = hid_sensor_convert_exponent(exp);
 140         if (exp >= 0) {
 141                 *val1 = sign * value * pow_10(exp);
 142                 *val2 = 0;
 143         } else {
 144                 split_micro_fraction(value, -exp, val1, val2);
 145                 if (*val1)
 146                         *val1 = sign * (*val1);
 147                 else
 148                         *val2 = sign * (*val2);
 149         }
 150 }
 151
 152 static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
 153 {
 154         u32 value;
 155         int sign = 1;
 156
 157         if (val1 < 0 || val2 < 0)
 158                 sign = -1;
 159         exp = hid_sensor_convert_exponent(exp);
 160         if (exp < 0) {
 161                 value = abs(val1) * pow_10(-exp);
 162                 value += abs(val2) / pow_10(6+exp);
 163         } else
 164                 value = abs(val1) / pow_10(exp);
 165         if (sign < 0)
 166                 value =  ((1LL << (size * 8)) - value);
 167
 168         return value;
 169 }
 170
 171 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
 172 {
 173         s32 value = 0;
 174         int ret;
 175
 176         ret = sensor_hub_get_feature(st->hsdev,
 177                                      st->poll.report_id,
 178                                      st->poll.index, sizeof(value), &value);
 179
 180         if (ret < 0 || value < 0) {
 181                 return -EINVAL;
 182         } else {
 183                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 184                         value = value * 1000;
 185         }
 186
 187         return value;
 188 }
 189 EXPORT_SYMBOL(hid_sensor_read_poll_value);
 190
 191 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
 192                                 int *val1, int *val2)
 193 {
 194         s32 value;
 195         int ret;
 196
 197         ret = sensor_hub_get_feature(st->hsdev,
 198                                      st->poll.report_id,
 199                                      st->poll.index, sizeof(value), &value);
 200         if (ret < 0 || value < 0) {
 201                 *val1 = *val2 = 0;
 202                 return -EINVAL;
 203         } else {
 204                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
 205                         simple_div(1000, value, val1, val2);
 206                 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 207                         simple_div(1, value, val1, val2);
 208                 else {
 209                         *val1 = *val2 = 0;
 210                         return -EINVAL;
 211                 }
 212         }
 213
 214         return IIO_VAL_INT_PLUS_MICRO;
 215 }
 216 EXPORT_SYMBOL(hid_sensor_read_samp_freq_value);
 217
 218 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 219                                 int val1, int val2)
 220 {
 221         s32 value;
 222         int ret;
 223
 224         if (val1 < 0 || val2 < 0)
 225                 return -EINVAL;
 226
 227         value = val1 * pow_10(6) + val2;
 228         if (value) {
 229                 if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
 230                         value = pow_10(9)/value;
 231                 else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
 232                         value = pow_10(6)/value;
 233                 else
 234                         value = 0;
 235         }
 236         ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
 237                                      st->poll.index, sizeof(value), &value);
 238         if (ret < 0 || value < 0)
 239                 return -EINVAL;
 240
 241         ret = sensor_hub_get_feature(st->hsdev,
 242                                      st->poll.report_id,
 243                                      st->poll.index, sizeof(value), &value);
 244         if (ret < 0 || value < 0)
 245                 return -EINVAL;
 246
 247         st->poll_interval = value;
 248
 249         return 0;
 250 }
 251 EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
 252
 253 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
 254                                 int *val1, int *val2)
 255 {
 256         s32 value;
 257         int ret;
 258
 259         ret = sensor_hub_get_feature(st->hsdev,
 260                                      st->sensitivity.report_id,
 261                                      st->sensitivity.index, sizeof(value),
 262                                      &value);
 263         if (ret < 0 || value < 0) {
 264                 *val1 = *val2 = 0;
 265                 return -EINVAL;
 266         } else {
 267                 convert_from_vtf_format(value, st->sensitivity.size,
 268                                         st->sensitivity.unit_expo,
 269                                         val1, val2);
 270         }
 271
 272         return IIO_VAL_INT_PLUS_MICRO;
 273 }
 274 EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);
 275
 276 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 277                                         int val1, int val2)
 278 {
 279         s32 value;
 280         int ret;
 281
 282         if (val1 < 0 || val2 < 0)
 283                 return -EINVAL;
 284
 285         value = convert_to_vtf_format(st->sensitivity.size,
 286                                 st->sensitivity.unit_expo,
 287                                 val1, val2);
 288         ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
 289                                      st->sensitivity.index, sizeof(value),
 290                                      &value);
 291         if (ret < 0 || value < 0)
 292                 return -EINVAL;
 293
 294         ret = sensor_hub_get_feature(st->hsdev,
 295                                      st->sensitivity.report_id,
 296                                      st->sensitivity.index, sizeof(value),
 297                                      &value);
 298         if (ret < 0 || value < 0)
 299                 return -EINVAL;
 300
 301         st->raw_hystersis = value;
 302
 303         return 0;
 304 }
 305 EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
 306
 307 /*
 308  * This fuction applies the unit exponent to the scale.
 309  * For example:
 310  * 9.806650000 ->exp:2-> val0[980]val1[665000000]
 311  * 9.000806000 ->exp:2-> val0[900]val1[80600000]
 312  * 0.174535293 ->exp:2-> val0[17]val1[453529300]
 313  * 1.001745329 ->exp:0-> val0[1]val1[1745329]
 314  * 1.001745329 ->exp:2-> val0[100]val1[174532900]
 315  * 1.001745329 ->exp:4-> val0[10017]val1[453290000]
 316  * 9.806650000 ->exp:-2-> val0[0]val1[98066500]
 317  */
 318 static void adjust_exponent_nano(int *val0, int *val1, int scale0,
 319                                   int scale1, int exp)
 320 {
 321         int i;
 322         int x;
 323         int res;
 324         int rem;
 325
 326         if (exp > 0) {
 327                 *val0 = scale0 * pow_10(exp);
 328                 res = 0;
 329                 if (exp > 9) {
 330                         *val1 = 0;
 331                         return;
 332                 }
 333                 for (i = 0; i < exp; ++i) {
 334                         x = scale1 / pow_10(8 - i);
 335                         res += (pow_10(exp - 1 - i) * x);
 336                         scale1 = scale1 % pow_10(8 - i);
 337                 }
 338                 *val0 += res;
 339                         *val1 = scale1 * pow_10(exp);
 340         } else if (exp < 0) {
 341                 exp = abs(exp);
 342                 if (exp > 9) {
 343                         *val0 = *val1 = 0;
 344                         return;
 345                 }
 346                 *val0 = scale0 / pow_10(exp);
 347                 rem = scale0 % pow_10(exp);
 348                 res = 0;
 349                 for (i = 0; i < (9 - exp); ++i) {
 350                         x = scale1 / pow_10(8 - i);
 351                         res += (pow_10(8 - exp - i) * x);
 352                         scale1 = scale1 % pow_10(8 - i);
 353                 }
 354                 *val1 = rem * pow_10(9 - exp) + res;
 355         } else {
 356                 *val0 = scale0;
 357                 *val1 = scale1;
 358         }
 359 }
 360
 361 int hid_sensor_format_scale(u32 usage_id,
 362                         struct hid_sensor_hub_attribute_info *attr_info,
 363                         int *val0, int *val1)
 364 {
 365         int i;
 366         int exp;
 367
 368         *val0 = 1;
 369         *val1 = 0;
 370
 371         for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
 372                 if (unit_conversion[i].usage_id == usage_id &&
 373                         unit_conversion[i].unit == attr_info->units) {
 374                         exp  = hid_sensor_convert_exponent(
 375                                                 attr_info->unit_expo);
 376                         adjust_exponent_nano(val0, val1,
 377                                         unit_conversion[i].scale_val0,
 378                                         unit_conversion[i].scale_val1, exp);
 379                         break;
 380                 }
 381         }
 382
 383         return IIO_VAL_INT_PLUS_NANO;
 384 }
 385 EXPORT_SYMBOL(hid_sensor_format_scale);
 386
 387 int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
 388                                      int64_t raw_value)
 389 {
 390         return st->timestamp_ns_scale * raw_value;
 391 }
 392 EXPORT_SYMBOL(hid_sensor_convert_timestamp);
 393
 394 static
 395 int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
 396                                         u32 usage_id,
 397                                         struct hid_sensor_common *st)
 398 {
 399         sensor_hub_input_get_attribute_info(hsdev,
 400                                         HID_FEATURE_REPORT, usage_id,
 401                                         HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
 402                                         &st->poll);
 403         /* Default unit of measure is milliseconds */
 404         if (st->poll.units == 0)
 405                 st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
 406
 407         st->poll_interval = -1;
 408
 409         return 0;
 410
 411 }
 412
 413 static void hid_sensor_get_report_latency_info(struct hid_sensor_hub_device *hsdev,
 414                                                u32 usage_id,
 415                                                struct hid_sensor_common *st)
 416 {
 417         sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT,
 418                                             usage_id,
 419                                             HID_USAGE_SENSOR_PROP_REPORT_LATENCY,
 420                                             &st->report_latency);
 421
 422         hid_dbg(hsdev->hdev, "Report latency attributes: %x:%x\n",
 423                 st->report_latency.index, st->report_latency.report_id);
 424 }
 425
 426 int hid_sensor_get_report_latency(struct hid_sensor_common *st)
 427 {
 428         int ret;
 429         int value;
 430
 431         ret = sensor_hub_get_feature(st->hsdev, st->report_latency.report_id,
 432                                      st->report_latency.index, sizeof(value),
 433                                      &value);
 434         if (ret < 0)
 435                 return ret;
 436
 437         return value;
 438 }
 439 EXPORT_SYMBOL(hid_sensor_get_report_latency);
 440
 441 int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency_ms)
 442 {
 443         return sensor_hub_set_feature(st->hsdev, st->report_latency.report_id,
 444                                       st->report_latency.index,
 445                                       sizeof(latency_ms), &latency_ms);
 446 }
 447 EXPORT_SYMBOL(hid_sensor_set_report_latency);
 448
 449 bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st)
 450 {
 451         return st->report_latency.index > 0 && st->report_latency.report_id > 0;
 452 }
 453 EXPORT_SYMBOL(hid_sensor_batch_mode_supported);
 454
 455 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 456                                         u32 usage_id,
 457                                         struct hid_sensor_common *st)
 458 {
 459
 460         struct hid_sensor_hub_attribute_info timestamp;
 461         s32 value;
 462         int ret;
 463
 464         hid_sensor_get_reporting_interval(hsdev, usage_id, st);
 465
 466         sensor_hub_input_get_attribute_info(hsdev,
 467                                         HID_FEATURE_REPORT, usage_id,
 468                                         HID_USAGE_SENSOR_PROP_REPORT_STATE,
 469                                         &st->report_state);
 470
 471         sensor_hub_input_get_attribute_info(hsdev,
 472                                         HID_FEATURE_REPORT, usage_id,
 473                                         HID_USAGE_SENSOR_PROY_POWER_STATE,
 474                                         &st->power_state);
 475
 476         sensor_hub_input_get_attribute_info(hsdev,
 477                         HID_FEATURE_REPORT, usage_id,
 478                         HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
 479                          &st->sensitivity);
 480
 481         st->raw_hystersis = -1;
 482
 483         sensor_hub_input_get_attribute_info(hsdev,
 484                                             HID_INPUT_REPORT, usage_id,
 485                                             HID_USAGE_SENSOR_TIME_TIMESTAMP,
 486                                             &timestamp);
 487         if (timestamp.index >= 0 && timestamp.report_id) {
 488                 int val0, val1;
 489
 490                 hid_sensor_format_scale(HID_USAGE_SENSOR_TIME_TIMESTAMP,
 491                                         &timestamp, &val0, &val1);
 492                 st->timestamp_ns_scale = val0;
 493         } else
 494                 st->timestamp_ns_scale = 1000000000;
 495
 496         hid_sensor_get_report_latency_info(hsdev, usage_id, st);
 497
 498         hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x %x:%x\n",
 499                 st->poll.index, st->poll.report_id,
 500                 st->report_state.index, st->report_state.report_id,
 501                 st->power_state.index, st->power_state.report_id,
 502                 st->sensitivity.index, st->sensitivity.report_id,
 503                 timestamp.index, timestamp.report_id);
 504
 505         ret = sensor_hub_get_feature(hsdev,
 506                                 st->power_state.report_id,
 507                                 st->power_state.index, sizeof(value), &value);
 508         if (ret < 0)
 509                 return ret;
 510         if (value < 0)
 511                 return -EINVAL;
 512
 513         return 0;
 514 }
 515 EXPORT_SYMBOL(hid_sensor_parse_common_attributes);
 516
 517 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 518 MODULE_DESCRIPTION("HID Sensor common attribute processing");
 519 MODULE_LICENSE("GPL");