1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * hid-sensor-custom.c 4 * Copyright (c) 2015, Intel Corporation. 5 */ 6 7 #include <linux/ctype.h> 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/miscdevice.h> 12 #include <linux/kfifo.h> 13 #include <linux/sched.h> 14 #include <linux/wait.h> 15 #include <linux/poll.h> 16 #include <linux/bsearch.h> 17 #include <linux/platform_device.h> 18 #include <linux/hid-sensor-hub.h> 19 20 #define HID_CUSTOM_NAME_LENGTH 64 21 #define HID_CUSTOM_MAX_CORE_ATTRS 10 22 #define HID_CUSTOM_TOTAL_ATTRS (HID_CUSTOM_MAX_CORE_ATTRS + 1) 23 #define HID_CUSTOM_FIFO_SIZE 4096 24 #define HID_CUSTOM_MAX_FEATURE_BYTES 64 25 #define HID_SENSOR_USAGE_LENGTH (4 + 1) 26 27 struct hid_sensor_custom_field { 28 int report_id; 29 char group_name[HID_CUSTOM_NAME_LENGTH]; 30 struct hid_sensor_hub_attribute_info attribute; 31 struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS]; 32 char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH]; 33 struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS]; 34 struct attribute_group hid_custom_attribute_group; 35 }; 36 37 struct hid_sensor_custom { 38 struct mutex mutex; 39 struct platform_device *pdev; 40 struct hid_sensor_hub_device *hsdev; 41 struct hid_sensor_hub_callbacks callbacks; 42 int sensor_field_count; 43 struct hid_sensor_custom_field *fields; 44 int input_field_count; 45 int input_report_size; 46 int input_report_recd_size; 47 bool input_skip_sample; 48 bool enable; 49 struct hid_sensor_custom_field *power_state; 50 struct hid_sensor_custom_field *report_state; 51 struct miscdevice custom_dev; 52 struct kfifo data_fifo; 53 unsigned long misc_opened; 54 wait_queue_head_t wait; 55 struct platform_device *custom_pdev; 56 }; 57 58 /* Header for each sample to user space via dev interface */ 59 struct hid_sensor_sample { 60 u32 usage_id; 61 u64 timestamp; 62 u32 raw_len; 63 } __packed; 64 65 static struct attribute hid_custom_attrs[] = { 66 {.name = "name", .mode = S_IRUGO}, 67 {.name = "units", .mode = S_IRUGO}, 68 {.name = "unit-expo", .mode = S_IRUGO}, 69 {.name = "minimum", .mode = S_IRUGO}, 70 {.name = "maximum", .mode = S_IRUGO}, 71 {.name = "size", .mode = S_IRUGO}, 72 {.name = "value", .mode = S_IWUSR | S_IRUGO}, 73 {.name = NULL} 74 }; 75 76 static const struct hid_custom_usage_desc { 77 int usage_id; 78 char *desc; 79 } hid_custom_usage_desc_table[] = { 80 {0x200201, "event-sensor-state"}, 81 {0x200202, "event-sensor-event"}, 82 {0x200301, "property-friendly-name"}, 83 {0x200302, "property-persistent-unique-id"}, 84 {0x200303, "property-sensor-status"}, 85 {0x200304, "property-min-report-interval"}, 86 {0x200305, "property-sensor-manufacturer"}, 87 {0x200306, "property-sensor-model"}, 88 {0x200307, "property-sensor-serial-number"}, 89 {0x200308, "property-sensor-description"}, 90 {0x200309, "property-sensor-connection-type"}, 91 {0x20030A, "property-sensor-device-path"}, 92 {0x20030B, "property-hardware-revision"}, 93 {0x20030C, "property-firmware-version"}, 94 {0x20030D, "property-release-date"}, 95 {0x20030E, "property-report-interval"}, 96 {0x20030F, "property-change-sensitivity-absolute"}, 97 {0x200310, "property-change-sensitivity-percent-range"}, 98 {0x200311, "property-change-sensitivity-percent-relative"}, 99 {0x200312, "property-accuracy"}, 100 {0x200313, "property-resolution"}, 101 {0x200314, "property-maximum"}, 102 {0x200315, "property-minimum"}, 103 {0x200316, "property-reporting-state"}, 104 {0x200317, "property-sampling-rate"}, 105 {0x200318, "property-response-curve"}, 106 {0x200319, "property-power-state"}, 107 {0x200540, "data-field-custom"}, 108 {0x200541, "data-field-custom-usage"}, 109 {0x200542, "data-field-custom-boolean-array"}, 110 {0x200543, "data-field-custom-value"}, 111 {0x200544, "data-field-custom-value_1"}, 112 {0x200545, "data-field-custom-value_2"}, 113 {0x200546, "data-field-custom-value_3"}, 114 {0x200547, "data-field-custom-value_4"}, 115 {0x200548, "data-field-custom-value_5"}, 116 {0x200549, "data-field-custom-value_6"}, 117 {0x20054A, "data-field-custom-value_7"}, 118 {0x20054B, "data-field-custom-value_8"}, 119 {0x20054C, "data-field-custom-value_9"}, 120 {0x20054D, "data-field-custom-value_10"}, 121 {0x20054E, "data-field-custom-value_11"}, 122 {0x20054F, "data-field-custom-value_12"}, 123 {0x200550, "data-field-custom-value_13"}, 124 {0x200551, "data-field-custom-value_14"}, 125 {0x200552, "data-field-custom-value_15"}, 126 {0x200553, "data-field-custom-value_16"}, 127 {0x200554, "data-field-custom-value_17"}, 128 {0x200555, "data-field-custom-value_18"}, 129 {0x200556, "data-field-custom-value_19"}, 130 {0x200557, "data-field-custom-value_20"}, 131 {0x200558, "data-field-custom-value_21"}, 132 {0x200559, "data-field-custom-value_22"}, 133 {0x20055A, "data-field-custom-value_23"}, 134 {0x20055B, "data-field-custom-value_24"}, 135 {0x20055C, "data-field-custom-value_25"}, 136 {0x20055D, "data-field-custom-value_26"}, 137 {0x20055E, "data-field-custom-value_27"}, 138 {0x20055F, "data-field-custom-value_28"}, 139 }; 140 141 static int usage_id_cmp(const void *p1, const void *p2) 142 { 143 if (*(int *)p1 < *(int *)p2) 144 return -1; 145 146 if (*(int *)p1 > *(int *)p2) 147 return 1; 148 149 return 0; 150 } 151 152 static ssize_t enable_sensor_show(struct device *dev, 153 struct device_attribute *attr, char *buf) 154 { 155 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev); 156 157 return sprintf(buf, "%d\n", sensor_inst->enable); 158 } 159 160 static int set_power_report_state(struct hid_sensor_custom *sensor_inst, 161 bool state) 162 { 163 int power_val = -1; 164 int report_val = -1; 165 u32 power_state_usage_id; 166 u32 report_state_usage_id; 167 int ret; 168 169 /* 170 * It is possible that the power/report state ids are not present. 171 * In this case this function will return success. But if the 172 * ids are present, then it will return error if set fails. 173 */ 174 if (state) { 175 power_state_usage_id = 176 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM; 177 report_state_usage_id = 178 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM; 179 } else { 180 power_state_usage_id = 181 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM; 182 report_state_usage_id = 183 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM; 184 } 185 186 if (sensor_inst->power_state) 187 power_val = hid_sensor_get_usage_index(sensor_inst->hsdev, 188 sensor_inst->power_state->attribute.report_id, 189 sensor_inst->power_state->attribute.index, 190 power_state_usage_id); 191 if (sensor_inst->report_state) 192 report_val = hid_sensor_get_usage_index(sensor_inst->hsdev, 193 sensor_inst->report_state->attribute.report_id, 194 sensor_inst->report_state->attribute.index, 195 report_state_usage_id); 196 197 if (power_val >= 0) { 198 power_val += 199 sensor_inst->power_state->attribute.logical_minimum; 200 ret = sensor_hub_set_feature(sensor_inst->hsdev, 201 sensor_inst->power_state->attribute.report_id, 202 sensor_inst->power_state->attribute.index, 203 sizeof(power_val), 204 &power_val); 205 if (ret) { 206 hid_err(sensor_inst->hsdev->hdev, 207 "Set power state failed\n"); 208 return ret; 209 } 210 } 211 212 if (report_val >= 0) { 213 report_val += 214 sensor_inst->report_state->attribute.logical_minimum; 215 ret = sensor_hub_set_feature(sensor_inst->hsdev, 216 sensor_inst->report_state->attribute.report_id, 217 sensor_inst->report_state->attribute.index, 218 sizeof(report_val), 219 &report_val); 220 if (ret) { 221 hid_err(sensor_inst->hsdev->hdev, 222 "Set report state failed\n"); 223 return ret; 224 } 225 } 226 227 return 0; 228 } 229 230 static ssize_t enable_sensor_store(struct device *dev, 231 struct device_attribute *attr, 232 const char *buf, size_t count) 233 { 234 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev); 235 int value; 236 int ret = -EINVAL; 237 238 if (kstrtoint(buf, 0, &value) != 0) 239 return -EINVAL; 240 241 mutex_lock(&sensor_inst->mutex); 242 if (value && !sensor_inst->enable) { 243 ret = sensor_hub_device_open(sensor_inst->hsdev); 244 if (ret) 245 goto unlock_state; 246 247 ret = set_power_report_state(sensor_inst, true); 248 if (ret) { 249 sensor_hub_device_close(sensor_inst->hsdev); 250 goto unlock_state; 251 } 252 sensor_inst->enable = true; 253 } else if (!value && sensor_inst->enable) { 254 ret = set_power_report_state(sensor_inst, false); 255 sensor_hub_device_close(sensor_inst->hsdev); 256 sensor_inst->enable = false; 257 } 258 unlock_state: 259 mutex_unlock(&sensor_inst->mutex); 260 if (ret < 0) 261 return ret; 262 263 return count; 264 } 265 static DEVICE_ATTR_RW(enable_sensor); 266 267 static struct attribute *enable_sensor_attrs[] = { 268 &dev_attr_enable_sensor.attr, 269 NULL, 270 }; 271 272 static const struct attribute_group enable_sensor_attr_group = { 273 .attrs = enable_sensor_attrs, 274 }; 275 276 static ssize_t show_value(struct device *dev, struct device_attribute *attr, 277 char *buf) 278 { 279 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev); 280 struct hid_sensor_hub_attribute_info *attribute; 281 int index, usage, field_index; 282 char name[HID_CUSTOM_NAME_LENGTH]; 283 bool feature = false; 284 bool input = false; 285 int value = 0; 286 287 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage, 288 name) == 3) { 289 feature = true; 290 field_index = index + sensor_inst->input_field_count; 291 } else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage, 292 name) == 3) { 293 input = true; 294 field_index = index; 295 } else 296 return -EINVAL; 297 298 if (!strncmp(name, "value", strlen("value"))) { 299 u32 report_id; 300 int ret; 301 302 attribute = &sensor_inst->fields[field_index].attribute; 303 report_id = attribute->report_id; 304 if (feature) { 305 u8 values[HID_CUSTOM_MAX_FEATURE_BYTES]; 306 int len = 0; 307 u64 value = 0; 308 int i = 0; 309 310 ret = sensor_hub_get_feature(sensor_inst->hsdev, 311 report_id, 312 index, 313 sizeof(values), values); 314 if (ret < 0) 315 return ret; 316 317 while (i < ret) { 318 if (i + attribute->size > ret) { 319 len += scnprintf(&buf[len], 320 PAGE_SIZE - len, 321 "%d ", values[i]); 322 break; 323 } 324 switch (attribute->size) { 325 case 2: 326 value = (u64) *(u16 *)&values[i]; 327 i += attribute->size; 328 break; 329 case 4: 330 value = (u64) *(u32 *)&values[i]; 331 i += attribute->size; 332 break; 333 case 8: 334 value = *(u64 *)&values[i]; 335 i += attribute->size; 336 break; 337 default: 338 value = (u64) values[i]; 339 ++i; 340 break; 341 } 342 len += scnprintf(&buf[len], PAGE_SIZE - len, 343 "%lld ", value); 344 } 345 len += scnprintf(&buf[len], PAGE_SIZE - len, "\n"); 346 347 return len; 348 } else if (input) 349 value = sensor_hub_input_attr_get_raw_value( 350 sensor_inst->hsdev, 351 sensor_inst->hsdev->usage, 352 usage, report_id, 353 SENSOR_HUB_SYNC, false); 354 } else if (!strncmp(name, "units", strlen("units"))) 355 value = sensor_inst->fields[field_index].attribute.units; 356 else if (!strncmp(name, "unit-expo", strlen("unit-expo"))) 357 value = sensor_inst->fields[field_index].attribute.unit_expo; 358 else if (!strncmp(name, "size", strlen("size"))) 359 value = sensor_inst->fields[field_index].attribute.size; 360 else if (!strncmp(name, "minimum", strlen("minimum"))) 361 value = sensor_inst->fields[field_index].attribute. 362 logical_minimum; 363 else if (!strncmp(name, "maximum", strlen("maximum"))) 364 value = sensor_inst->fields[field_index].attribute. 365 logical_maximum; 366 else if (!strncmp(name, "name", strlen("name"))) { 367 struct hid_custom_usage_desc *usage_desc; 368 369 usage_desc = bsearch(&usage, hid_custom_usage_desc_table, 370 ARRAY_SIZE(hid_custom_usage_desc_table), 371 sizeof(struct hid_custom_usage_desc), 372 usage_id_cmp); 373 if (usage_desc) 374 return snprintf(buf, PAGE_SIZE, "%s\n", 375 usage_desc->desc); 376 else 377 return sprintf(buf, "not-specified\n"); 378 } else 379 return -EINVAL; 380 381 return sprintf(buf, "%d\n", value); 382 } 383 384 static ssize_t store_value(struct device *dev, struct device_attribute *attr, 385 const char *buf, size_t count) 386 { 387 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev); 388 int index, field_index, usage; 389 char name[HID_CUSTOM_NAME_LENGTH]; 390 int value, ret; 391 392 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage, 393 name) == 3) { 394 field_index = index + sensor_inst->input_field_count; 395 } else 396 return -EINVAL; 397 398 if (!strncmp(name, "value", strlen("value"))) { 399 u32 report_id; 400 401 if (kstrtoint(buf, 0, &value) != 0) 402 return -EINVAL; 403 404 report_id = sensor_inst->fields[field_index].attribute. 405 report_id; 406 ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id, 407 index, sizeof(value), &value); 408 if (ret) 409 return ret; 410 } else 411 return -EINVAL; 412 413 return count; 414 } 415 416 static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev, 417 unsigned usage_id, size_t raw_len, 418 char *raw_data, void *priv) 419 { 420 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv); 421 struct hid_sensor_sample header; 422 423 /* If any error occurs in a sample, rest of the fields are ignored */ 424 if (sensor_inst->input_skip_sample) { 425 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n"); 426 return 0; 427 } 428 429 hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__, 430 (int) (sensor_inst->input_report_recd_size + raw_len), 431 sensor_inst->input_report_size); 432 433 if (!test_bit(0, &sensor_inst->misc_opened)) 434 return 0; 435 436 if (!sensor_inst->input_report_recd_size) { 437 int required_size = sizeof(struct hid_sensor_sample) + 438 sensor_inst->input_report_size; 439 header.usage_id = hsdev->usage; 440 header.raw_len = sensor_inst->input_report_size; 441 header.timestamp = ktime_get_real_ns(); 442 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) { 443 kfifo_in(&sensor_inst->data_fifo, 444 (unsigned char *)&header, 445 sizeof(header)); 446 } else 447 sensor_inst->input_skip_sample = true; 448 } 449 if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len) 450 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data, 451 raw_len); 452 453 sensor_inst->input_report_recd_size += raw_len; 454 455 return 0; 456 } 457 458 static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev, 459 unsigned usage_id, void *priv) 460 { 461 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv); 462 463 if (!test_bit(0, &sensor_inst->misc_opened)) 464 return 0; 465 466 sensor_inst->input_report_recd_size = 0; 467 sensor_inst->input_skip_sample = false; 468 469 wake_up(&sensor_inst->wait); 470 471 return 0; 472 } 473 474 static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst, 475 int index, int report_type, 476 struct hid_report *report, 477 struct hid_field *field) 478 { 479 struct hid_sensor_custom_field *sensor_field; 480 void *fields; 481 482 fields = krealloc(sensor_inst->fields, 483 (sensor_inst->sensor_field_count + 1) * 484 sizeof(struct hid_sensor_custom_field), GFP_KERNEL); 485 if (!fields) { 486 kfree(sensor_inst->fields); 487 return -ENOMEM; 488 } 489 sensor_inst->fields = fields; 490 sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count]; 491 sensor_field->attribute.usage_id = sensor_inst->hsdev->usage; 492 if (field->logical) 493 sensor_field->attribute.attrib_id = field->logical; 494 else 495 sensor_field->attribute.attrib_id = field->usage[0].hid; 496 497 sensor_field->attribute.index = index; 498 sensor_field->attribute.report_id = report->id; 499 sensor_field->attribute.units = field->unit; 500 sensor_field->attribute.unit_expo = field->unit_exponent; 501 sensor_field->attribute.size = (field->report_size / 8); 502 sensor_field->attribute.logical_minimum = field->logical_minimum; 503 sensor_field->attribute.logical_maximum = field->logical_maximum; 504 505 if (report_type == HID_FEATURE_REPORT) 506 snprintf(sensor_field->group_name, 507 sizeof(sensor_field->group_name), "feature-%x-%x", 508 sensor_field->attribute.index, 509 sensor_field->attribute.attrib_id); 510 else if (report_type == HID_INPUT_REPORT) { 511 snprintf(sensor_field->group_name, 512 sizeof(sensor_field->group_name), 513 "input-%x-%x", sensor_field->attribute.index, 514 sensor_field->attribute.attrib_id); 515 sensor_inst->input_field_count++; 516 sensor_inst->input_report_size += (field->report_size * 517 field->report_count) / 8; 518 } 519 520 memset(&sensor_field->hid_custom_attribute_group, 0, 521 sizeof(struct attribute_group)); 522 sensor_inst->sensor_field_count++; 523 524 return 0; 525 } 526 527 static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst, 528 struct hid_report_enum *report_enum, 529 int report_type) 530 { 531 int i; 532 int ret; 533 struct hid_report *report; 534 struct hid_field *field; 535 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev; 536 537 list_for_each_entry(report, &report_enum->report_list, list) { 538 for (i = 0; i < report->maxfield; ++i) { 539 field = report->field[i]; 540 if (field->maxusage && 541 ((field->usage[0].collection_index >= 542 hsdev->start_collection_index) && 543 (field->usage[0].collection_index < 544 hsdev->end_collection_index))) { 545 546 ret = hid_sensor_custom_add_field(sensor_inst, 547 i, 548 report_type, 549 report, 550 field); 551 if (ret) 552 return ret; 553 554 } 555 } 556 } 557 558 return 0; 559 } 560 561 static int hid_sensor_custom_add_attributes(struct hid_sensor_custom 562 *sensor_inst) 563 { 564 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev; 565 struct hid_device *hdev = hsdev->hdev; 566 int ret = -1; 567 int i, j; 568 569 for (j = 0; j < HID_REPORT_TYPES; ++j) { 570 if (j == HID_OUTPUT_REPORT) 571 continue; 572 573 ret = hid_sensor_custom_add_fields(sensor_inst, 574 &hdev->report_enum[j], j); 575 if (ret) 576 return ret; 577 578 } 579 580 /* Create sysfs attributes */ 581 for (i = 0; i < sensor_inst->sensor_field_count; ++i) { 582 j = 0; 583 while (j < HID_CUSTOM_TOTAL_ATTRS && 584 hid_custom_attrs[j].name) { 585 struct device_attribute *device_attr; 586 587 device_attr = &sensor_inst->fields[i].sd_attrs[j]; 588 589 snprintf((char *)&sensor_inst->fields[i].attr_name[j], 590 HID_CUSTOM_NAME_LENGTH, "%s-%s", 591 sensor_inst->fields[i].group_name, 592 hid_custom_attrs[j].name); 593 sysfs_attr_init(&device_attr->attr); 594 device_attr->attr.name = 595 (char *)&sensor_inst->fields[i].attr_name[j]; 596 device_attr->attr.mode = hid_custom_attrs[j].mode; 597 device_attr->show = show_value; 598 if (hid_custom_attrs[j].mode & S_IWUSR) 599 device_attr->store = store_value; 600 sensor_inst->fields[i].attrs[j] = &device_attr->attr; 601 ++j; 602 } 603 sensor_inst->fields[i].attrs[j] = NULL; 604 sensor_inst->fields[i].hid_custom_attribute_group.attrs = 605 sensor_inst->fields[i].attrs; 606 sensor_inst->fields[i].hid_custom_attribute_group.name = 607 sensor_inst->fields[i].group_name; 608 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj, 609 &sensor_inst->fields[i]. 610 hid_custom_attribute_group); 611 if (ret) 612 break; 613 614 /* For power or report field store indexes */ 615 if (sensor_inst->fields[i].attribute.attrib_id == 616 HID_USAGE_SENSOR_PROY_POWER_STATE) 617 sensor_inst->power_state = &sensor_inst->fields[i]; 618 else if (sensor_inst->fields[i].attribute.attrib_id == 619 HID_USAGE_SENSOR_PROP_REPORT_STATE) 620 sensor_inst->report_state = &sensor_inst->fields[i]; 621 } 622 623 return ret; 624 } 625 626 static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom * 627 sensor_inst) 628 { 629 int i; 630 631 for (i = 0; i < sensor_inst->sensor_field_count; ++i) 632 sysfs_remove_group(&sensor_inst->pdev->dev.kobj, 633 &sensor_inst->fields[i]. 634 hid_custom_attribute_group); 635 636 kfree(sensor_inst->fields); 637 } 638 639 static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf, 640 size_t count, loff_t *f_ps) 641 { 642 struct hid_sensor_custom *sensor_inst; 643 unsigned int copied; 644 int ret; 645 646 sensor_inst = container_of(file->private_data, 647 struct hid_sensor_custom, custom_dev); 648 649 if (count < sizeof(struct hid_sensor_sample)) 650 return -EINVAL; 651 652 do { 653 if (kfifo_is_empty(&sensor_inst->data_fifo)) { 654 if (file->f_flags & O_NONBLOCK) 655 return -EAGAIN; 656 657 ret = wait_event_interruptible(sensor_inst->wait, 658 !kfifo_is_empty(&sensor_inst->data_fifo)); 659 if (ret) 660 return ret; 661 } 662 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count, 663 &copied); 664 if (ret) 665 return ret; 666 667 } while (copied == 0); 668 669 return copied; 670 } 671 672 static int hid_sensor_custom_release(struct inode *inode, struct file *file) 673 { 674 struct hid_sensor_custom *sensor_inst; 675 676 sensor_inst = container_of(file->private_data, 677 struct hid_sensor_custom, custom_dev); 678 679 clear_bit(0, &sensor_inst->misc_opened); 680 681 return 0; 682 } 683 684 static int hid_sensor_custom_open(struct inode *inode, struct file *file) 685 { 686 struct hid_sensor_custom *sensor_inst; 687 688 sensor_inst = container_of(file->private_data, 689 struct hid_sensor_custom, custom_dev); 690 /* We essentially have single reader and writer */ 691 if (test_and_set_bit(0, &sensor_inst->misc_opened)) 692 return -EBUSY; 693 694 return stream_open(inode, file); 695 } 696 697 static __poll_t hid_sensor_custom_poll(struct file *file, 698 struct poll_table_struct *wait) 699 { 700 struct hid_sensor_custom *sensor_inst; 701 __poll_t mask = 0; 702 703 sensor_inst = container_of(file->private_data, 704 struct hid_sensor_custom, custom_dev); 705 706 poll_wait(file, &sensor_inst->wait, wait); 707 708 if (!kfifo_is_empty(&sensor_inst->data_fifo)) 709 mask = EPOLLIN | EPOLLRDNORM; 710 711 return mask; 712 } 713 714 static const struct file_operations hid_sensor_custom_fops = { 715 .open = hid_sensor_custom_open, 716 .read = hid_sensor_custom_read, 717 .release = hid_sensor_custom_release, 718 .poll = hid_sensor_custom_poll, 719 .llseek = noop_llseek, 720 }; 721 722 static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst) 723 { 724 int ret; 725 726 ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE, 727 GFP_KERNEL); 728 if (ret) 729 return ret; 730 731 init_waitqueue_head(&sensor_inst->wait); 732 733 sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR; 734 sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev); 735 sensor_inst->custom_dev.fops = &hid_sensor_custom_fops, 736 ret = misc_register(&sensor_inst->custom_dev); 737 if (ret) { 738 kfifo_free(&sensor_inst->data_fifo); 739 return ret; 740 } 741 return 0; 742 } 743 744 static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom 745 *sensor_inst) 746 { 747 wake_up(&sensor_inst->wait); 748 misc_deregister(&sensor_inst->custom_dev); 749 kfifo_free(&sensor_inst->data_fifo); 750 751 } 752 753 /* luid defined in FW (e.g. ISH). Maybe used to identify sensor. */ 754 static const char *const known_sensor_luid[] = { "020B000000000000" }; 755 756 static int get_luid_table_index(unsigned char *usage_str) 757 { 758 int i; 759 760 for (i = 0; i < ARRAY_SIZE(known_sensor_luid); i++) { 761 if (!strncmp(usage_str, known_sensor_luid[i], 762 strlen(known_sensor_luid[i]))) 763 return i; 764 } 765 766 return -ENODEV; 767 } 768 769 static int get_known_custom_sensor_index(struct hid_sensor_hub_device *hsdev) 770 { 771 struct hid_sensor_hub_attribute_info sensor_manufacturer = { 0 }; 772 struct hid_sensor_hub_attribute_info sensor_luid_info = { 0 }; 773 int report_size; 774 int ret; 775 static u16 w_buf[HID_CUSTOM_MAX_FEATURE_BYTES]; 776 static char buf[HID_CUSTOM_MAX_FEATURE_BYTES]; 777 int i; 778 779 memset(w_buf, 0, sizeof(w_buf)); 780 memset(buf, 0, sizeof(buf)); 781 782 /* get manufacturer info */ 783 ret = sensor_hub_input_get_attribute_info(hsdev, 784 HID_FEATURE_REPORT, hsdev->usage, 785 HID_USAGE_SENSOR_PROP_MANUFACTURER, &sensor_manufacturer); 786 if (ret < 0) 787 return ret; 788 789 report_size = 790 sensor_hub_get_feature(hsdev, sensor_manufacturer.report_id, 791 sensor_manufacturer.index, sizeof(w_buf), 792 w_buf); 793 if (report_size <= 0) { 794 hid_err(hsdev->hdev, 795 "Failed to get sensor manufacturer info %d\n", 796 report_size); 797 return -ENODEV; 798 } 799 800 /* convert from wide char to char */ 801 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++) 802 buf[i] = (char)w_buf[i]; 803 804 /* ensure it's ISH sensor */ 805 if (strncmp(buf, "INTEL", strlen("INTEL"))) 806 return -ENODEV; 807 808 memset(w_buf, 0, sizeof(w_buf)); 809 memset(buf, 0, sizeof(buf)); 810 811 /* get real usage id */ 812 ret = sensor_hub_input_get_attribute_info(hsdev, 813 HID_FEATURE_REPORT, hsdev->usage, 814 HID_USAGE_SENSOR_PROP_SERIAL_NUM, &sensor_luid_info); 815 if (ret < 0) 816 return ret; 817 818 report_size = sensor_hub_get_feature(hsdev, sensor_luid_info.report_id, 819 sensor_luid_info.index, sizeof(w_buf), 820 w_buf); 821 if (report_size <= 0) { 822 hid_err(hsdev->hdev, "Failed to get real usage info %d\n", 823 report_size); 824 return -ENODEV; 825 } 826 827 /* convert from wide char to char */ 828 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++) 829 buf[i] = (char)w_buf[i]; 830 831 if (strlen(buf) != strlen(known_sensor_luid[0]) + 5) { 832 hid_err(hsdev->hdev, 833 "%s luid length not match %zu != (%zu + 5)\n", __func__, 834 strlen(buf), strlen(known_sensor_luid[0])); 835 return -ENODEV; 836 } 837 838 /* get table index with luid (not matching 'LUID: ' in luid) */ 839 return get_luid_table_index(&buf[5]); 840 } 841 842 static struct platform_device * 843 hid_sensor_register_platform_device(struct platform_device *pdev, 844 struct hid_sensor_hub_device *hsdev, 845 int index) 846 { 847 char real_usage[HID_SENSOR_USAGE_LENGTH] = { 0 }; 848 struct platform_device *custom_pdev; 849 const char *dev_name; 850 char *c; 851 852 /* copy real usage id */ 853 memcpy(real_usage, known_sensor_luid[index], 4); 854 855 /* usage id are all lowcase */ 856 for (c = real_usage; *c != '\0'; c++) 857 *c = tolower(*c); 858 859 /* HID-SENSOR-INT-REAL_USAGE_ID */ 860 dev_name = kasprintf(GFP_KERNEL, "HID-SENSOR-INT-%s", real_usage); 861 if (!dev_name) 862 return ERR_PTR(-ENOMEM); 863 864 custom_pdev = platform_device_register_data(pdev->dev.parent, dev_name, 865 PLATFORM_DEVID_NONE, hsdev, 866 sizeof(*hsdev)); 867 kfree(dev_name); 868 return custom_pdev; 869 } 870 871 static int hid_sensor_custom_probe(struct platform_device *pdev) 872 { 873 struct hid_sensor_custom *sensor_inst; 874 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 875 int ret; 876 int index; 877 878 sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst), 879 GFP_KERNEL); 880 if (!sensor_inst) 881 return -ENOMEM; 882 883 sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample; 884 sensor_inst->callbacks.send_event = hid_sensor_send_event; 885 sensor_inst->callbacks.pdev = pdev; 886 sensor_inst->hsdev = hsdev; 887 sensor_inst->pdev = pdev; 888 mutex_init(&sensor_inst->mutex); 889 platform_set_drvdata(pdev, sensor_inst); 890 891 index = get_known_custom_sensor_index(hsdev); 892 if (index >= 0 && index < ARRAY_SIZE(known_sensor_luid)) { 893 sensor_inst->custom_pdev = 894 hid_sensor_register_platform_device(pdev, hsdev, index); 895 896 ret = PTR_ERR_OR_ZERO(sensor_inst->custom_pdev); 897 if (ret) { 898 dev_err(&pdev->dev, 899 "register_platform_device failed\n"); 900 return ret; 901 } 902 903 return 0; 904 } 905 906 ret = sensor_hub_register_callback(hsdev, hsdev->usage, 907 &sensor_inst->callbacks); 908 if (ret < 0) { 909 dev_err(&pdev->dev, "callback reg failed\n"); 910 return ret; 911 } 912 913 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj, 914 &enable_sensor_attr_group); 915 if (ret) 916 goto err_remove_callback; 917 918 ret = hid_sensor_custom_add_attributes(sensor_inst); 919 if (ret) 920 goto err_remove_group; 921 922 ret = hid_sensor_custom_dev_if_add(sensor_inst); 923 if (ret) 924 goto err_remove_attributes; 925 926 return 0; 927 928 err_remove_attributes: 929 hid_sensor_custom_remove_attributes(sensor_inst); 930 err_remove_group: 931 sysfs_remove_group(&sensor_inst->pdev->dev.kobj, 932 &enable_sensor_attr_group); 933 err_remove_callback: 934 sensor_hub_remove_callback(hsdev, hsdev->usage); 935 936 return ret; 937 } 938 939 static int hid_sensor_custom_remove(struct platform_device *pdev) 940 { 941 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev); 942 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 943 944 if (sensor_inst->custom_pdev) { 945 platform_device_unregister(sensor_inst->custom_pdev); 946 return 0; 947 } 948 949 hid_sensor_custom_dev_if_remove(sensor_inst); 950 hid_sensor_custom_remove_attributes(sensor_inst); 951 sysfs_remove_group(&sensor_inst->pdev->dev.kobj, 952 &enable_sensor_attr_group); 953 sensor_hub_remove_callback(hsdev, hsdev->usage); 954 955 return 0; 956 } 957 958 static const struct platform_device_id hid_sensor_custom_ids[] = { 959 { 960 .name = "HID-SENSOR-2000e1", 961 }, 962 { 963 .name = "HID-SENSOR-2000e2", 964 }, 965 { /* sentinel */ } 966 }; 967 MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids); 968 969 static struct platform_driver hid_sensor_custom_platform_driver = { 970 .id_table = hid_sensor_custom_ids, 971 .driver = { 972 .name = KBUILD_MODNAME, 973 }, 974 .probe = hid_sensor_custom_probe, 975 .remove = hid_sensor_custom_remove, 976 }; 977 module_platform_driver(hid_sensor_custom_platform_driver); 978 979 MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver"); 980 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 981 MODULE_LICENSE("GPL"); 982