drivers/hid/hid-sensor-custom.c

   1 /*
   2  * hid-sensor-custom.c
   3  * Copyright (c) 2015, 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
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/miscdevice.h>
  19 #include <linux/kfifo.h>
  20 #include <linux/sched.h>
  21 #include <linux/wait.h>
  22 #include <linux/poll.h>
  23 #include <linux/bsearch.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/hid-sensor-hub.h>
  26
  27 #define HID_CUSTOM_NAME_LENGTH          64
  28 #define HID_CUSTOM_MAX_CORE_ATTRS       10
  29 #define HID_CUSTOM_TOTAL_ATTRS          (HID_CUSTOM_MAX_CORE_ATTRS + 1)
  30 #define HID_CUSTOM_FIFO_SIZE            4096
  31 #define HID_CUSTOM_MAX_FEATURE_BYTES    64
  32
  33 struct hid_sensor_custom_field {
  34         int report_id;
  35         char group_name[HID_CUSTOM_NAME_LENGTH];
  36         struct hid_sensor_hub_attribute_info attribute;
  37         struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS];
  38         char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH];
  39         struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS];
  40         struct attribute_group hid_custom_attribute_group;
  41 };
  42
  43 struct hid_sensor_custom {
  44         struct mutex mutex;
  45         struct platform_device *pdev;
  46         struct hid_sensor_hub_device *hsdev;
  47         struct hid_sensor_hub_callbacks callbacks;
  48         int sensor_field_count;
  49         struct hid_sensor_custom_field *fields;
  50         int input_field_count;
  51         int input_report_size;
  52         int input_report_recd_size;
  53         bool input_skip_sample;
  54         bool enable;
  55         struct hid_sensor_custom_field *power_state;
  56         struct hid_sensor_custom_field *report_state;
  57         struct miscdevice custom_dev;
  58         struct kfifo data_fifo;
  59         unsigned long misc_opened;
  60         wait_queue_head_t wait;
  61 };
  62
  63 /* Header for each sample to user space via dev interface */
  64 struct hid_sensor_sample {
  65         u32 usage_id;
  66         u64 timestamp;
  67         u32 raw_len;
  68 } __packed;
  69
  70 static struct attribute hid_custom_attrs[] = {
  71         {.name = "name", .mode = S_IRUGO},
  72         {.name = "units", .mode = S_IRUGO},
  73         {.name = "unit-expo", .mode = S_IRUGO},
  74         {.name = "minimum", .mode = S_IRUGO},
  75         {.name = "maximum", .mode = S_IRUGO},
  76         {.name = "size", .mode = S_IRUGO},
  77         {.name = "value", .mode = S_IWUSR | S_IRUGO},
  78         {.name = NULL}
  79 };
  80
  81 static const struct hid_custom_usage_desc {
  82         int usage_id;
  83         char *desc;
  84 } hid_custom_usage_desc_table[] = {
  85         {0x200201,      "event-sensor-state"},
  86         {0x200202,      "event-sensor-event"},
  87         {0x200301,      "property-friendly-name"},
  88         {0x200302,      "property-persistent-unique-id"},
  89         {0x200303,      "property-sensor-status"},
  90         {0x200304,      "property-min-report-interval"},
  91         {0x200305,      "property-sensor-manufacturer"},
  92         {0x200306,      "property-sensor-model"},
  93         {0x200307,      "property-sensor-serial-number"},
  94         {0x200308,      "property-sensor-description"},
  95         {0x200309,      "property-sensor-connection-type"},
  96         {0x20030A,      "property-sensor-device-path"},
  97         {0x20030B,      "property-hardware-revision"},
  98         {0x20030C,      "property-firmware-version"},
  99         {0x20030D,      "property-release-date"},
 100         {0x20030E,      "property-report-interval"},
 101         {0x20030F,      "property-change-sensitivity-absolute"},
 102         {0x200310,      "property-change-sensitivity-percent-range"},
 103         {0x200311,      "property-change-sensitivity-percent-relative"},
 104         {0x200312,      "property-accuracy"},
 105         {0x200313,      "property-resolution"},
 106         {0x200314,      "property-maximum"},
 107         {0x200315,      "property-minimum"},
 108         {0x200316,      "property-reporting-state"},
 109         {0x200317,      "property-sampling-rate"},
 110         {0x200318,      "property-response-curve"},
 111         {0x200319,      "property-power-state"},
 112         {0x200540,      "data-field-custom"},
 113         {0x200541,      "data-field-custom-usage"},
 114         {0x200542,      "data-field-custom-boolean-array"},
 115         {0x200543,      "data-field-custom-value"},
 116         {0x200544,      "data-field-custom-value_1"},
 117         {0x200545,      "data-field-custom-value_2"},
 118         {0x200546,      "data-field-custom-value_3"},
 119         {0x200547,      "data-field-custom-value_4"},
 120         {0x200548,      "data-field-custom-value_5"},
 121         {0x200549,      "data-field-custom-value_6"},
 122         {0x20054A,      "data-field-custom-value_7"},
 123         {0x20054B,      "data-field-custom-value_8"},
 124         {0x20054C,      "data-field-custom-value_9"},
 125         {0x20054D,      "data-field-custom-value_10"},
 126         {0x20054E,      "data-field-custom-value_11"},
 127         {0x20054F,      "data-field-custom-value_12"},
 128         {0x200550,      "data-field-custom-value_13"},
 129         {0x200551,      "data-field-custom-value_14"},
 130         {0x200552,      "data-field-custom-value_15"},
 131         {0x200553,      "data-field-custom-value_16"},
 132         {0x200554,      "data-field-custom-value_17"},
 133         {0x200555,      "data-field-custom-value_18"},
 134         {0x200556,      "data-field-custom-value_19"},
 135         {0x200557,      "data-field-custom-value_20"},
 136         {0x200558,      "data-field-custom-value_21"},
 137         {0x200559,      "data-field-custom-value_22"},
 138         {0x20055A,      "data-field-custom-value_23"},
 139         {0x20055B,      "data-field-custom-value_24"},
 140         {0x20055C,      "data-field-custom-value_25"},
 141         {0x20055D,      "data-field-custom-value_26"},
 142         {0x20055E,      "data-field-custom-value_27"},
 143         {0x20055F,      "data-field-custom-value_28"},
 144 };
 145
 146 static int usage_id_cmp(const void *p1, const void *p2)
 147 {
 148         if (*(int *)p1 < *(int *)p2)
 149                 return -1;
 150
 151         if (*(int *)p1 > *(int *)p2)
 152                 return 1;
 153
 154         return 0;
 155 }
 156
 157 static ssize_t enable_sensor_show(struct device *dev,
 158                                   struct device_attribute *attr, char *buf)
 159 {
 160         struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 161
 162         return sprintf(buf, "%d\n", sensor_inst->enable);
 163 }
 164
 165 static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
 166                                   bool state)
 167 {
 168         int power_val = -1;
 169         int report_val = -1;
 170         u32 power_state_usage_id;
 171         u32 report_state_usage_id;
 172         int ret;
 173
 174         /*
 175          * It is possible that the power/report state ids are not present.
 176          * In this case this function will return success. But if the
 177          * ids are present, then it will return error if set fails.
 178          */
 179         if (state) {
 180                 power_state_usage_id =
 181                         HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
 182                 report_state_usage_id =
 183                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
 184         } else {
 185                 power_state_usage_id =
 186                         HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
 187                 report_state_usage_id =
 188                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
 189         }
 190
 191         if (sensor_inst->power_state)
 192                 power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
 193                                 sensor_inst->power_state->attribute.report_id,
 194                                 sensor_inst->power_state->attribute.index,
 195                                 power_state_usage_id);
 196         if (sensor_inst->report_state)
 197                 report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
 198                                 sensor_inst->report_state->attribute.report_id,
 199                                 sensor_inst->report_state->attribute.index,
 200                                 report_state_usage_id);
 201
 202         if (power_val >= 0) {
 203                 power_val +=
 204                         sensor_inst->power_state->attribute.logical_minimum;
 205                 ret = sensor_hub_set_feature(sensor_inst->hsdev,
 206                                 sensor_inst->power_state->attribute.report_id,
 207                                 sensor_inst->power_state->attribute.index,
 208                                 sizeof(power_val),
 209                                 &power_val);
 210                 if (ret) {
 211                         hid_err(sensor_inst->hsdev->hdev,
 212                                 "Set power state failed\n");
 213                         return ret;
 214                 }
 215         }
 216
 217         if (report_val >= 0) {
 218                 report_val +=
 219                         sensor_inst->report_state->attribute.logical_minimum;
 220                 ret = sensor_hub_set_feature(sensor_inst->hsdev,
 221                                 sensor_inst->report_state->attribute.report_id,
 222                                 sensor_inst->report_state->attribute.index,
 223                                 sizeof(report_val),
 224                                 &report_val);
 225                 if (ret) {
 226                         hid_err(sensor_inst->hsdev->hdev,
 227                                 "Set report state failed\n");
 228                         return ret;
 229                 }
 230         }
 231
 232         return 0;
 233 }
 234
 235 static ssize_t enable_sensor_store(struct device *dev,
 236                                    struct device_attribute *attr,
 237                                    const char *buf, size_t count)
 238 {
 239         struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 240         int value;
 241         int ret = -EINVAL;
 242
 243         if (kstrtoint(buf, 0, &value) != 0)
 244                 return -EINVAL;
 245
 246         mutex_lock(&sensor_inst->mutex);
 247         if (value && !sensor_inst->enable) {
 248                 ret = sensor_hub_device_open(sensor_inst->hsdev);
 249                 if (ret)
 250                         goto unlock_state;
 251
 252                 ret = set_power_report_state(sensor_inst, true);
 253                 if (ret) {
 254                         sensor_hub_device_close(sensor_inst->hsdev);
 255                         goto unlock_state;
 256                 }
 257                 sensor_inst->enable = true;
 258         } else if (!value && sensor_inst->enable) {
 259                 ret = set_power_report_state(sensor_inst, false);
 260                 sensor_hub_device_close(sensor_inst->hsdev);
 261                 sensor_inst->enable = false;
 262         }
 263 unlock_state:
 264         mutex_unlock(&sensor_inst->mutex);
 265         if (ret < 0)
 266                 return ret;
 267
 268         return count;
 269 }
 270 static DEVICE_ATTR_RW(enable_sensor);
 271
 272 static struct attribute *enable_sensor_attrs[] = {
 273         &dev_attr_enable_sensor.attr,
 274         NULL,
 275 };
 276
 277 static const struct attribute_group enable_sensor_attr_group = {
 278         .attrs = enable_sensor_attrs,
 279 };
 280
 281 static ssize_t show_value(struct device *dev, struct device_attribute *attr,
 282                           char *buf)
 283 {
 284         struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 285         struct hid_sensor_hub_attribute_info *attribute;
 286         int index, usage, field_index;
 287         char name[HID_CUSTOM_NAME_LENGTH];
 288         bool feature = false;
 289         bool input = false;
 290         int value = 0;
 291
 292         if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
 293                    name) == 3) {
 294                 feature = true;
 295                 field_index = index + sensor_inst->input_field_count;
 296         } else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
 297                    name) == 3) {
 298                 input = true;
 299                 field_index = index;
 300         } else
 301                 return -EINVAL;
 302
 303         if (!strncmp(name, "value", strlen("value"))) {
 304                 u32 report_id;
 305                 int ret;
 306
 307                 attribute = &sensor_inst->fields[field_index].attribute;
 308                 report_id = attribute->report_id;
 309                 if (feature) {
 310                         u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
 311                         int len = 0;
 312                         u64 value = 0;
 313                         int i = 0;
 314
 315                         ret = sensor_hub_get_feature(sensor_inst->hsdev,
 316                                                      report_id,
 317                                                      index,
 318                                                      sizeof(values), values);
 319                         if (ret < 0)
 320                                 return ret;
 321
 322                         while (i < ret) {
 323                                 if (i + attribute->size > ret) {
 324                                         len += snprintf(&buf[len],
 325                                                         PAGE_SIZE - len,
 326                                                         "%d ", values[i]);
 327                                         break;
 328                                 }
 329                                 switch (attribute->size) {
 330                                 case 2:
 331                                         value = (u64) *(u16 *)&values[i];
 332                                         i += attribute->size;
 333                                         break;
 334                                 case 4:
 335                                         value = (u64) *(u32 *)&values[i];
 336                                         i += attribute->size;
 337                                         break;
 338                                 case 8:
 339                                         value = *(u64 *)&values[i];
 340                                         i += attribute->size;
 341                                         break;
 342                                 default:
 343                                         value = (u64) values[i];
 344                                         ++i;
 345                                         break;
 346                                 }
 347                                 len += snprintf(&buf[len], PAGE_SIZE - len,
 348                                                 "%lld ", value);
 349                         }
 350                         len += snprintf(&buf[len], PAGE_SIZE - len, "\n");
 351
 352                         return len;
 353                 } else if (input)
 354                         value = sensor_hub_input_attr_get_raw_value(
 355                                                 sensor_inst->hsdev,
 356                                                 sensor_inst->hsdev->usage,
 357                                                 usage, report_id,
 358                                                 SENSOR_HUB_SYNC, false);
 359         } else if (!strncmp(name, "units", strlen("units")))
 360                 value = sensor_inst->fields[field_index].attribute.units;
 361         else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
 362                 value = sensor_inst->fields[field_index].attribute.unit_expo;
 363         else if (!strncmp(name, "size", strlen("size")))
 364                 value = sensor_inst->fields[field_index].attribute.size;
 365         else if (!strncmp(name, "minimum", strlen("minimum")))
 366                 value = sensor_inst->fields[field_index].attribute.
 367                                                         logical_minimum;
 368         else if (!strncmp(name, "maximum", strlen("maximum")))
 369                 value = sensor_inst->fields[field_index].attribute.
 370                                                         logical_maximum;
 371         else if (!strncmp(name, "name", strlen("name"))) {
 372                 struct hid_custom_usage_desc *usage_desc;
 373
 374                 usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
 375                                      ARRAY_SIZE(hid_custom_usage_desc_table),
 376                                      sizeof(struct hid_custom_usage_desc),
 377                                      usage_id_cmp);
 378                 if (usage_desc)
 379                         return snprintf(buf, PAGE_SIZE, "%s\n",
 380                                         usage_desc->desc);
 381                 else
 382                         return sprintf(buf, "not-specified\n");
 383          } else
 384                 return -EINVAL;
 385
 386         return sprintf(buf, "%d\n", value);
 387 }
 388
 389 static ssize_t store_value(struct device *dev, struct device_attribute *attr,
 390                            const char *buf, size_t count)
 391 {
 392         struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 393         int index, field_index, usage;
 394         char name[HID_CUSTOM_NAME_LENGTH];
 395         int value;
 396
 397         if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
 398                    name) == 3) {
 399                 field_index = index + sensor_inst->input_field_count;
 400         } else
 401                 return -EINVAL;
 402
 403         if (!strncmp(name, "value", strlen("value"))) {
 404                 u32 report_id;
 405                 int ret;
 406
 407                 if (kstrtoint(buf, 0, &value) != 0)
 408                         return -EINVAL;
 409
 410                 report_id = sensor_inst->fields[field_index].attribute.
 411                                                                 report_id;
 412                 ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
 413                                              index, sizeof(value), &value);
 414         } else
 415                 return -EINVAL;
 416
 417         return count;
 418 }
 419
 420 static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
 421                                   unsigned usage_id, size_t raw_len,
 422                                   char *raw_data, void *priv)
 423 {
 424         struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
 425         struct hid_sensor_sample header;
 426
 427         /* If any error occurs in a sample, rest of the fields are ignored */
 428         if (sensor_inst->input_skip_sample) {
 429                 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
 430                 return 0;
 431         }
 432
 433         hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
 434                 (int) (sensor_inst->input_report_recd_size + raw_len),
 435                 sensor_inst->input_report_size);
 436
 437         if (!test_bit(0, &sensor_inst->misc_opened))
 438                 return 0;
 439
 440         if (!sensor_inst->input_report_recd_size) {
 441                 int required_size = sizeof(struct hid_sensor_sample) +
 442                                                 sensor_inst->input_report_size;
 443                 header.usage_id = hsdev->usage;
 444                 header.raw_len = sensor_inst->input_report_size;
 445                 header.timestamp = ktime_get_real_ns();
 446                 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
 447                         kfifo_in(&sensor_inst->data_fifo,
 448                                  (unsigned char *)&header,
 449                                  sizeof(header));
 450                 } else
 451                         sensor_inst->input_skip_sample = true;
 452         }
 453         if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
 454                 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
 455                          raw_len);
 456
 457         sensor_inst->input_report_recd_size += raw_len;
 458
 459         return 0;
 460 }
 461
 462 static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
 463                                  unsigned usage_id, void *priv)
 464 {
 465         struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
 466
 467         if (!test_bit(0, &sensor_inst->misc_opened))
 468                 return 0;
 469
 470         sensor_inst->input_report_recd_size = 0;
 471         sensor_inst->input_skip_sample = false;
 472
 473         wake_up(&sensor_inst->wait);
 474
 475         return 0;
 476 }
 477
 478 static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
 479                                        int index, int report_type,
 480                                        struct hid_report *report,
 481                                        struct hid_field *field)
 482 {
 483         struct hid_sensor_custom_field *sensor_field;
 484         void *fields;
 485
 486         fields = krealloc(sensor_inst->fields,
 487                           (sensor_inst->sensor_field_count + 1) *
 488                            sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
 489         if (!fields) {
 490                 kfree(sensor_inst->fields);
 491                 return -ENOMEM;
 492         }
 493         sensor_inst->fields = fields;
 494         sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
 495         sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
 496         if (field->logical)
 497                 sensor_field->attribute.attrib_id = field->logical;
 498         else
 499                 sensor_field->attribute.attrib_id = field->usage[0].hid;
 500
 501         sensor_field->attribute.index = index;
 502         sensor_field->attribute.report_id = report->id;
 503         sensor_field->attribute.units = field->unit;
 504         sensor_field->attribute.unit_expo = field->unit_exponent;
 505         sensor_field->attribute.size = (field->report_size / 8);
 506         sensor_field->attribute.logical_minimum = field->logical_minimum;
 507         sensor_field->attribute.logical_maximum = field->logical_maximum;
 508
 509         if (report_type == HID_FEATURE_REPORT)
 510                 snprintf(sensor_field->group_name,
 511                          sizeof(sensor_field->group_name), "feature-%x-%x",
 512                          sensor_field->attribute.index,
 513                          sensor_field->attribute.attrib_id);
 514         else if (report_type == HID_INPUT_REPORT) {
 515                 snprintf(sensor_field->group_name,
 516                          sizeof(sensor_field->group_name),
 517                          "input-%x-%x", sensor_field->attribute.index,
 518                          sensor_field->attribute.attrib_id);
 519                 sensor_inst->input_field_count++;
 520                 sensor_inst->input_report_size += (field->report_size *
 521                                                    field->report_count) / 8;
 522         }
 523
 524         memset(&sensor_field->hid_custom_attribute_group, 0,
 525                sizeof(struct attribute_group));
 526         sensor_inst->sensor_field_count++;
 527
 528         return 0;
 529 }
 530
 531 static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
 532                                         struct hid_report_enum *report_enum,
 533                                         int report_type)
 534 {
 535         int i;
 536         int ret;
 537         struct hid_report *report;
 538         struct hid_field *field;
 539         struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
 540
 541         list_for_each_entry(report, &report_enum->report_list, list) {
 542                 for (i = 0; i < report->maxfield; ++i) {
 543                         field = report->field[i];
 544                         if (field->maxusage &&
 545                             ((field->usage[0].collection_index >=
 546                               hsdev->start_collection_index) &&
 547                               (field->usage[0].collection_index <
 548                                hsdev->end_collection_index))) {
 549
 550                                 ret = hid_sensor_custom_add_field(sensor_inst,
 551                                                                   i,
 552                                                                   report_type,
 553                                                                   report,
 554                                                                   field);
 555                                 if (ret)
 556                                         return ret;
 557
 558                         }
 559                 }
 560         }
 561
 562         return 0;
 563 }
 564
 565 static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
 566                                                                 *sensor_inst)
 567 {
 568         struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
 569         struct hid_device *hdev = hsdev->hdev;
 570         int ret = -1;
 571         int i, j;
 572
 573         for (j = 0; j < HID_REPORT_TYPES; ++j) {
 574                 if (j == HID_OUTPUT_REPORT)
 575                         continue;
 576
 577                 ret = hid_sensor_custom_add_fields(sensor_inst,
 578                                                    &hdev->report_enum[j], j);
 579                 if (ret)
 580                         return ret;
 581
 582         }
 583
 584         /* Create sysfs attributes */
 585         for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
 586                 j = 0;
 587                 while (j < HID_CUSTOM_TOTAL_ATTRS &&
 588                        hid_custom_attrs[j].name) {
 589                         struct device_attribute *device_attr;
 590
 591                         device_attr = &sensor_inst->fields[i].sd_attrs[j];
 592
 593                         snprintf((char *)&sensor_inst->fields[i].attr_name[j],
 594                                  HID_CUSTOM_NAME_LENGTH, "%s-%s",
 595                                  sensor_inst->fields[i].group_name,
 596                                  hid_custom_attrs[j].name);
 597                         sysfs_attr_init(&device_attr->attr);
 598                         device_attr->attr.name =
 599                                 (char *)&sensor_inst->fields[i].attr_name[j];
 600                         device_attr->attr.mode = hid_custom_attrs[j].mode;
 601                         device_attr->show = show_value;
 602                         if (hid_custom_attrs[j].mode & S_IWUSR)
 603                                 device_attr->store = store_value;
 604                         sensor_inst->fields[i].attrs[j] = &device_attr->attr;
 605                         ++j;
 606                 }
 607                 sensor_inst->fields[i].attrs[j] = NULL;
 608                 sensor_inst->fields[i].hid_custom_attribute_group.attrs =
 609                                                 sensor_inst->fields[i].attrs;
 610                 sensor_inst->fields[i].hid_custom_attribute_group.name =
 611                                         sensor_inst->fields[i].group_name;
 612                 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
 613                                          &sensor_inst->fields[i].
 614                                          hid_custom_attribute_group);
 615                 if (ret)
 616                         break;
 617
 618                 /* For power or report field store indexes */
 619                 if (sensor_inst->fields[i].attribute.attrib_id ==
 620                                         HID_USAGE_SENSOR_PROY_POWER_STATE)
 621                         sensor_inst->power_state = &sensor_inst->fields[i];
 622                 else if (sensor_inst->fields[i].attribute.attrib_id ==
 623                                         HID_USAGE_SENSOR_PROP_REPORT_STATE)
 624                         sensor_inst->report_state = &sensor_inst->fields[i];
 625         }
 626
 627         return ret;
 628 }
 629
 630 static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
 631                                                                 sensor_inst)
 632 {
 633         int i;
 634
 635         for (i = 0; i < sensor_inst->sensor_field_count; ++i)
 636                 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
 637                                    &sensor_inst->fields[i].
 638                                    hid_custom_attribute_group);
 639
 640         kfree(sensor_inst->fields);
 641 }
 642
 643 static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
 644                                       size_t count, loff_t *f_ps)
 645 {
 646         struct hid_sensor_custom *sensor_inst;
 647         unsigned int copied;
 648         int ret;
 649
 650         sensor_inst = container_of(file->private_data,
 651                                    struct hid_sensor_custom, custom_dev);
 652
 653         if (count < sizeof(struct hid_sensor_sample))
 654                 return -EINVAL;
 655
 656         do {
 657                 if (kfifo_is_empty(&sensor_inst->data_fifo)) {
 658                         if (file->f_flags & O_NONBLOCK)
 659                                 return -EAGAIN;
 660
 661                         ret = wait_event_interruptible(sensor_inst->wait,
 662                                 !kfifo_is_empty(&sensor_inst->data_fifo));
 663                         if (ret)
 664                                 return ret;
 665                 }
 666                 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
 667                                     &copied);
 668                 if (ret)
 669                         return ret;
 670
 671         } while (copied == 0);
 672
 673         return copied;
 674 }
 675
 676 static int hid_sensor_custom_release(struct inode *inode, struct file *file)
 677 {
 678         struct hid_sensor_custom *sensor_inst;
 679
 680         sensor_inst = container_of(file->private_data,
 681                                    struct hid_sensor_custom, custom_dev);
 682
 683         clear_bit(0, &sensor_inst->misc_opened);
 684
 685         return 0;
 686 }
 687
 688 static int hid_sensor_custom_open(struct inode *inode, struct file *file)
 689 {
 690         struct hid_sensor_custom *sensor_inst;
 691
 692         sensor_inst = container_of(file->private_data,
 693                                    struct hid_sensor_custom, custom_dev);
 694         /* We essentially have single reader and writer */
 695         if (test_and_set_bit(0, &sensor_inst->misc_opened))
 696                 return -EBUSY;
 697
 698         return nonseekable_open(inode, file);
 699 }
 700
 701 static __poll_t hid_sensor_custom_poll(struct file *file,
 702                                            struct poll_table_struct *wait)
 703 {
 704         struct hid_sensor_custom *sensor_inst;
 705         __poll_t mask = 0;
 706
 707         sensor_inst = container_of(file->private_data,
 708                                    struct hid_sensor_custom, custom_dev);
 709
 710         poll_wait(file, &sensor_inst->wait, wait);
 711
 712         if (!kfifo_is_empty(&sensor_inst->data_fifo))
 713                 mask = EPOLLIN | EPOLLRDNORM;
 714
 715         return mask;
 716 }
 717
 718 static const struct file_operations hid_sensor_custom_fops = {
 719         .open =  hid_sensor_custom_open,
 720         .read =  hid_sensor_custom_read,
 721         .release = hid_sensor_custom_release,
 722         .poll = hid_sensor_custom_poll,
 723         .llseek = noop_llseek,
 724 };
 725
 726 static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
 727 {
 728         int ret;
 729
 730         ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
 731                           GFP_KERNEL);
 732         if (ret)
 733                 return ret;
 734
 735         init_waitqueue_head(&sensor_inst->wait);
 736
 737         sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
 738         sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
 739         sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
 740         ret = misc_register(&sensor_inst->custom_dev);
 741         if (ret) {
 742                 kfifo_free(&sensor_inst->data_fifo);
 743                 return ret;
 744         }
 745         return 0;
 746 }
 747
 748 static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
 749                                                                 *sensor_inst)
 750 {
 751         wake_up(&sensor_inst->wait);
 752         misc_deregister(&sensor_inst->custom_dev);
 753         kfifo_free(&sensor_inst->data_fifo);
 754
 755 }
 756
 757 static int hid_sensor_custom_probe(struct platform_device *pdev)
 758 {
 759         struct hid_sensor_custom *sensor_inst;
 760         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 761         int ret;
 762
 763         sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
 764                                    GFP_KERNEL);
 765         if (!sensor_inst)
 766                 return -ENOMEM;
 767
 768         sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
 769         sensor_inst->callbacks.send_event = hid_sensor_send_event;
 770         sensor_inst->callbacks.pdev = pdev;
 771         sensor_inst->hsdev = hsdev;
 772         sensor_inst->pdev = pdev;
 773         mutex_init(&sensor_inst->mutex);
 774         platform_set_drvdata(pdev, sensor_inst);
 775         ret = sensor_hub_register_callback(hsdev, hsdev->usage,
 776                                            &sensor_inst->callbacks);
 777         if (ret < 0) {
 778                 dev_err(&pdev->dev, "callback reg failed\n");
 779                 return ret;
 780         }
 781
 782         ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
 783                                  &enable_sensor_attr_group);
 784         if (ret)
 785                 goto err_remove_callback;
 786
 787         ret = hid_sensor_custom_add_attributes(sensor_inst);
 788         if (ret)
 789                 goto err_remove_group;
 790
 791         ret = hid_sensor_custom_dev_if_add(sensor_inst);
 792         if (ret)
 793                 goto err_remove_attributes;
 794
 795         return 0;
 796
 797 err_remove_attributes:
 798         hid_sensor_custom_remove_attributes(sensor_inst);
 799 err_remove_group:
 800         sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
 801                            &enable_sensor_attr_group);
 802 err_remove_callback:
 803         sensor_hub_remove_callback(hsdev, hsdev->usage);
 804
 805         return ret;
 806 }
 807
 808 static int hid_sensor_custom_remove(struct platform_device *pdev)
 809 {
 810         struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
 811         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 812
 813         hid_sensor_custom_dev_if_remove(sensor_inst);
 814         hid_sensor_custom_remove_attributes(sensor_inst);
 815         sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
 816                            &enable_sensor_attr_group);
 817         sensor_hub_remove_callback(hsdev, hsdev->usage);
 818
 819         return 0;
 820 }
 821
 822 static const struct platform_device_id hid_sensor_custom_ids[] = {
 823         {
 824                 .name = "HID-SENSOR-2000e1",
 825         },
 826         {
 827                 .name = "HID-SENSOR-2000e2",
 828         },
 829         { /* sentinel */ }
 830 };
 831 MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
 832
 833 static struct platform_driver hid_sensor_custom_platform_driver = {
 834         .id_table = hid_sensor_custom_ids,
 835         .driver = {
 836                 .name   = KBUILD_MODNAME,
 837         },
 838         .probe          = hid_sensor_custom_probe,
 839         .remove         = hid_sensor_custom_remove,
 840 };
 841 module_platform_driver(hid_sensor_custom_platform_driver);
 842
 843 MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
 844 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 845 MODULE_LICENSE("GPL");