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 platform_device *pdev = to_platform_device(dev);
161 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
162 
163 	return sprintf(buf, "%d\n", sensor_inst->enable);
164 }
165 
166 static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
167 				  bool state)
168 {
169 	int power_val = -1;
170 	int report_val = -1;
171 	u32 power_state_usage_id;
172 	u32 report_state_usage_id;
173 	int ret;
174 
175 	/*
176 	 * It is possible that the power/report state ids are not present.
177 	 * In this case this function will return success. But if the
178 	 * ids are present, then it will return error if set fails.
179 	 */
180 	if (state) {
181 		power_state_usage_id =
182 			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
183 		report_state_usage_id =
184 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
185 	} else {
186 		power_state_usage_id =
187 			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
188 		report_state_usage_id =
189 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
190 	}
191 
192 	if (sensor_inst->power_state)
193 		power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
194 				sensor_inst->power_state->attribute.report_id,
195 				sensor_inst->power_state->attribute.index,
196 				power_state_usage_id);
197 	if (sensor_inst->report_state)
198 		report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
199 				sensor_inst->report_state->attribute.report_id,
200 				sensor_inst->report_state->attribute.index,
201 				report_state_usage_id);
202 
203 	if (power_val >= 0) {
204 		power_val +=
205 			sensor_inst->power_state->attribute.logical_minimum;
206 		ret = sensor_hub_set_feature(sensor_inst->hsdev,
207 				sensor_inst->power_state->attribute.report_id,
208 				sensor_inst->power_state->attribute.index,
209 				sizeof(power_val),
210 				&power_val);
211 		if (ret) {
212 			hid_err(sensor_inst->hsdev->hdev,
213 				"Set power state failed\n");
214 			return ret;
215 		}
216 	}
217 
218 	if (report_val >= 0) {
219 		report_val +=
220 			sensor_inst->report_state->attribute.logical_minimum;
221 		ret = sensor_hub_set_feature(sensor_inst->hsdev,
222 				sensor_inst->report_state->attribute.report_id,
223 				sensor_inst->report_state->attribute.index,
224 				sizeof(report_val),
225 				&report_val);
226 		if (ret) {
227 			hid_err(sensor_inst->hsdev->hdev,
228 				"Set report state failed\n");
229 			return ret;
230 		}
231 	}
232 
233 	return 0;
234 }
235 
236 static ssize_t enable_sensor_store(struct device *dev,
237 				   struct device_attribute *attr,
238 				   const char *buf, size_t count)
239 {
240 	struct platform_device *pdev = to_platform_device(dev);
241 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
242 	int value;
243 	int ret = -EINVAL;
244 
245 	if (kstrtoint(buf, 0, &value) != 0)
246 		return -EINVAL;
247 
248 	mutex_lock(&sensor_inst->mutex);
249 	if (value && !sensor_inst->enable) {
250 		ret = sensor_hub_device_open(sensor_inst->hsdev);
251 		if (ret)
252 			goto unlock_state;
253 
254 		ret = set_power_report_state(sensor_inst, true);
255 		if (ret) {
256 			sensor_hub_device_close(sensor_inst->hsdev);
257 			goto unlock_state;
258 		}
259 		sensor_inst->enable = true;
260 	} else if (!value && sensor_inst->enable) {
261 		ret = set_power_report_state(sensor_inst, false);
262 		sensor_hub_device_close(sensor_inst->hsdev);
263 		sensor_inst->enable = false;
264 	}
265 unlock_state:
266 	mutex_unlock(&sensor_inst->mutex);
267 	if (ret < 0)
268 		return ret;
269 
270 	return count;
271 }
272 static DEVICE_ATTR_RW(enable_sensor);
273 
274 static struct attribute *enable_sensor_attrs[] = {
275 	&dev_attr_enable_sensor.attr,
276 	NULL,
277 };
278 
279 static struct attribute_group enable_sensor_attr_group = {
280 	.attrs = enable_sensor_attrs,
281 };
282 
283 static ssize_t show_value(struct device *dev, struct device_attribute *attr,
284 			  char *buf)
285 {
286 	struct platform_device *pdev = to_platform_device(dev);
287 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
288 	struct hid_sensor_hub_attribute_info *attribute;
289 	int index, usage, field_index;
290 	char name[HID_CUSTOM_NAME_LENGTH];
291 	bool feature = false;
292 	bool input = false;
293 	int value = 0;
294 
295 	if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
296 		   name) == 3) {
297 		feature = true;
298 		field_index = index + sensor_inst->input_field_count;
299 	} else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
300 		   name) == 3) {
301 		input = true;
302 		field_index = index;
303 	} else
304 		return -EINVAL;
305 
306 	if (!strncmp(name, "value", strlen("value"))) {
307 		u32 report_id;
308 		int ret;
309 
310 		attribute = &sensor_inst->fields[field_index].attribute;
311 		report_id = attribute->report_id;
312 		if (feature) {
313 			u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
314 			int len = 0;
315 			u64 value = 0;
316 			int i = 0;
317 
318 			ret = sensor_hub_get_feature(sensor_inst->hsdev,
319 						     report_id,
320 						     index,
321 						     sizeof(values), values);
322 			if (ret < 0)
323 				return ret;
324 
325 			while (i < ret) {
326 				if (i + attribute->size > ret) {
327 					len += snprintf(&buf[len],
328 							PAGE_SIZE - len,
329 							"%d ", values[i]);
330 					break;
331 				}
332 				switch (attribute->size) {
333 				case 2:
334 					value = (u64) *(u16 *)&values[i];
335 					i += attribute->size;
336 					break;
337 				case 4:
338 					value = (u64) *(u32 *)&values[i];
339 					i += attribute->size;
340 					break;
341 				case 8:
342 					value = *(u64 *)&values[i];
343 					i += attribute->size;
344 					break;
345 				default:
346 					value = (u64) values[i];
347 					++i;
348 					break;
349 				}
350 				len += snprintf(&buf[len], PAGE_SIZE - len,
351 						"%lld ", value);
352 			}
353 			len += snprintf(&buf[len], PAGE_SIZE - len, "\n");
354 
355 			return len;
356 		} else if (input)
357 			value = sensor_hub_input_attr_get_raw_value(
358 						sensor_inst->hsdev,
359 						sensor_inst->hsdev->usage,
360 						usage, report_id,
361 						SENSOR_HUB_SYNC);
362 	} else if (!strncmp(name, "units", strlen("units")))
363 		value = sensor_inst->fields[field_index].attribute.units;
364 	else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
365 		value = sensor_inst->fields[field_index].attribute.unit_expo;
366 	else if (!strncmp(name, "size", strlen("size")))
367 		value = sensor_inst->fields[field_index].attribute.size;
368 	else if (!strncmp(name, "minimum", strlen("minimum")))
369 		value = sensor_inst->fields[field_index].attribute.
370 							logical_minimum;
371 	else if (!strncmp(name, "maximum", strlen("maximum")))
372 		value = sensor_inst->fields[field_index].attribute.
373 							logical_maximum;
374 	else if (!strncmp(name, "name", strlen("name"))) {
375 		struct hid_custom_usage_desc *usage_desc;
376 
377 		usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
378 				     ARRAY_SIZE(hid_custom_usage_desc_table),
379 				     sizeof(struct hid_custom_usage_desc),
380 				     usage_id_cmp);
381 		if (usage_desc)
382 			return snprintf(buf, PAGE_SIZE, "%s\n",
383 					usage_desc->desc);
384 		else
385 			return sprintf(buf, "not-specified\n");
386 	 } else
387 		return -EINVAL;
388 
389 	return sprintf(buf, "%d\n", value);
390 }
391 
392 static ssize_t store_value(struct device *dev, struct device_attribute *attr,
393 			   const char *buf, size_t count)
394 {
395 	struct platform_device *pdev = to_platform_device(dev);
396 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
397 	int index, field_index, usage;
398 	char name[HID_CUSTOM_NAME_LENGTH];
399 	int value;
400 
401 	if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
402 		   name) == 3) {
403 		field_index = index + sensor_inst->input_field_count;
404 	} else
405 		return -EINVAL;
406 
407 	if (!strncmp(name, "value", strlen("value"))) {
408 		u32 report_id;
409 		int ret;
410 
411 		if (kstrtoint(buf, 0, &value) != 0)
412 			return -EINVAL;
413 
414 		report_id = sensor_inst->fields[field_index].attribute.
415 								report_id;
416 		ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
417 					     index, sizeof(value), &value);
418 	} else
419 		return -EINVAL;
420 
421 	return count;
422 }
423 
424 static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
425 				  unsigned usage_id, size_t raw_len,
426 				  char *raw_data, void *priv)
427 {
428 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
429 	struct hid_sensor_sample header;
430 
431 	/* If any error occurs in a sample, rest of the fields are ignored */
432 	if (sensor_inst->input_skip_sample) {
433 		hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
434 		return 0;
435 	}
436 
437 	hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
438 		(int) (sensor_inst->input_report_recd_size + raw_len),
439 		sensor_inst->input_report_size);
440 
441 	if (!test_bit(0, &sensor_inst->misc_opened))
442 		return 0;
443 
444 	if (!sensor_inst->input_report_recd_size) {
445 		int required_size = sizeof(struct hid_sensor_sample) +
446 						sensor_inst->input_report_size;
447 		header.usage_id = hsdev->usage;
448 		header.raw_len = sensor_inst->input_report_size;
449 		header.timestamp = ktime_get_real_ns();
450 		if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
451 			kfifo_in(&sensor_inst->data_fifo,
452 				 (unsigned char *)&header,
453 				 sizeof(header));
454 		} else
455 			sensor_inst->input_skip_sample = true;
456 	}
457 	if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
458 		kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
459 			 raw_len);
460 
461 	sensor_inst->input_report_recd_size += raw_len;
462 
463 	return 0;
464 }
465 
466 static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
467 				 unsigned usage_id, void *priv)
468 {
469 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
470 
471 	if (!test_bit(0, &sensor_inst->misc_opened))
472 		return 0;
473 
474 	sensor_inst->input_report_recd_size = 0;
475 	sensor_inst->input_skip_sample = false;
476 
477 	wake_up(&sensor_inst->wait);
478 
479 	return 0;
480 }
481 
482 static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
483 				       int index, int report_type,
484 				       struct hid_report *report,
485 				       struct hid_field *field)
486 {
487 	struct hid_sensor_custom_field *sensor_field;
488 	void *fields;
489 
490 	fields = krealloc(sensor_inst->fields,
491 			  (sensor_inst->sensor_field_count + 1) *
492 			   sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
493 	if (!fields) {
494 		kfree(sensor_inst->fields);
495 		return -ENOMEM;
496 	}
497 	sensor_inst->fields = fields;
498 	sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
499 	sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
500 	if (field->logical)
501 		sensor_field->attribute.attrib_id = field->logical;
502 	else
503 		sensor_field->attribute.attrib_id = field->usage[0].hid;
504 
505 	sensor_field->attribute.index = index;
506 	sensor_field->attribute.report_id = report->id;
507 	sensor_field->attribute.units = field->unit;
508 	sensor_field->attribute.unit_expo = field->unit_exponent;
509 	sensor_field->attribute.size = (field->report_size / 8);
510 	sensor_field->attribute.logical_minimum = field->logical_minimum;
511 	sensor_field->attribute.logical_maximum = field->logical_maximum;
512 
513 	if (report_type == HID_FEATURE_REPORT)
514 		snprintf(sensor_field->group_name,
515 			 sizeof(sensor_field->group_name), "feature-%x-%x",
516 			 sensor_field->attribute.index,
517 			 sensor_field->attribute.attrib_id);
518 	else if (report_type == HID_INPUT_REPORT) {
519 		snprintf(sensor_field->group_name,
520 			 sizeof(sensor_field->group_name),
521 			 "input-%x-%x", sensor_field->attribute.index,
522 			 sensor_field->attribute.attrib_id);
523 		sensor_inst->input_field_count++;
524 		sensor_inst->input_report_size += (field->report_size *
525 						   field->report_count) / 8;
526 	}
527 
528 	memset(&sensor_field->hid_custom_attribute_group, 0,
529 	       sizeof(struct attribute_group));
530 	sensor_inst->sensor_field_count++;
531 
532 	return 0;
533 }
534 
535 static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
536 					struct hid_report_enum *report_enum,
537 					int report_type)
538 {
539 	int i;
540 	int ret;
541 	struct hid_report *report;
542 	struct hid_field *field;
543 	struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
544 
545 	list_for_each_entry(report, &report_enum->report_list, list) {
546 		for (i = 0; i < report->maxfield; ++i) {
547 			field = report->field[i];
548 			if (field->maxusage &&
549 			    ((field->usage[0].collection_index >=
550 			      hsdev->start_collection_index) &&
551 			      (field->usage[0].collection_index <
552 			       hsdev->end_collection_index))) {
553 
554 				ret = hid_sensor_custom_add_field(sensor_inst,
555 								  i,
556 								  report_type,
557 								  report,
558 								  field);
559 				if (ret)
560 					return ret;
561 
562 			}
563 		}
564 	}
565 
566 	return 0;
567 }
568 
569 static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
570 								*sensor_inst)
571 {
572 	struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
573 	struct hid_device *hdev = hsdev->hdev;
574 	int ret = -1;
575 	int i, j;
576 
577 	for (j = 0; j < HID_REPORT_TYPES; ++j) {
578 		if (j == HID_OUTPUT_REPORT)
579 			continue;
580 
581 		ret = hid_sensor_custom_add_fields(sensor_inst,
582 						   &hdev->report_enum[j], j);
583 		if (ret)
584 			return ret;
585 
586 	}
587 
588 	/* Create sysfs attributes */
589 	for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
590 		j = 0;
591 		while (j < HID_CUSTOM_TOTAL_ATTRS &&
592 		       hid_custom_attrs[j].name) {
593 			struct device_attribute *device_attr;
594 
595 			device_attr = &sensor_inst->fields[i].sd_attrs[j];
596 
597 			snprintf((char *)&sensor_inst->fields[i].attr_name[j],
598 				 HID_CUSTOM_NAME_LENGTH, "%s-%s",
599 				 sensor_inst->fields[i].group_name,
600 				 hid_custom_attrs[j].name);
601 			sysfs_attr_init(&device_attr->attr);
602 			device_attr->attr.name =
603 				(char *)&sensor_inst->fields[i].attr_name[j];
604 			device_attr->attr.mode = hid_custom_attrs[j].mode;
605 			device_attr->show = show_value;
606 			if (hid_custom_attrs[j].mode & S_IWUSR)
607 				device_attr->store = store_value;
608 			sensor_inst->fields[i].attrs[j] = &device_attr->attr;
609 			++j;
610 		}
611 		sensor_inst->fields[i].attrs[j] = NULL;
612 		sensor_inst->fields[i].hid_custom_attribute_group.attrs =
613 						sensor_inst->fields[i].attrs;
614 		sensor_inst->fields[i].hid_custom_attribute_group.name =
615 					sensor_inst->fields[i].group_name;
616 		ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
617 					 &sensor_inst->fields[i].
618 					 hid_custom_attribute_group);
619 		if (ret)
620 			break;
621 
622 		/* For power or report field store indexes */
623 		if (sensor_inst->fields[i].attribute.attrib_id ==
624 					HID_USAGE_SENSOR_PROY_POWER_STATE)
625 			sensor_inst->power_state = &sensor_inst->fields[i];
626 		else if (sensor_inst->fields[i].attribute.attrib_id ==
627 					HID_USAGE_SENSOR_PROP_REPORT_STATE)
628 			sensor_inst->report_state = &sensor_inst->fields[i];
629 	}
630 
631 	return ret;
632 }
633 
634 static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
635 								sensor_inst)
636 {
637 	int i;
638 
639 	for (i = 0; i < sensor_inst->sensor_field_count; ++i)
640 		sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
641 				   &sensor_inst->fields[i].
642 				   hid_custom_attribute_group);
643 
644 	kfree(sensor_inst->fields);
645 }
646 
647 static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
648 				      size_t count, loff_t *f_ps)
649 {
650 	struct hid_sensor_custom *sensor_inst;
651 	unsigned int copied;
652 	int ret;
653 
654 	sensor_inst = container_of(file->private_data,
655 				   struct hid_sensor_custom, custom_dev);
656 
657 	if (count < sizeof(struct hid_sensor_sample))
658 		return -EINVAL;
659 
660 	do {
661 		if (kfifo_is_empty(&sensor_inst->data_fifo)) {
662 			if (file->f_flags & O_NONBLOCK)
663 				return -EAGAIN;
664 
665 			ret = wait_event_interruptible(sensor_inst->wait,
666 				!kfifo_is_empty(&sensor_inst->data_fifo));
667 			if (ret)
668 				return ret;
669 		}
670 		ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
671 				    &copied);
672 		if (ret)
673 			return ret;
674 
675 	} while (copied == 0);
676 
677 	return copied;
678 }
679 
680 static int hid_sensor_custom_release(struct inode *inode, struct file *file)
681 {
682 	struct hid_sensor_custom *sensor_inst;
683 
684 	sensor_inst = container_of(file->private_data,
685 				   struct hid_sensor_custom, custom_dev);
686 
687 	clear_bit(0, &sensor_inst->misc_opened);
688 
689 	return 0;
690 }
691 
692 static int hid_sensor_custom_open(struct inode *inode, struct file *file)
693 {
694 	struct hid_sensor_custom *sensor_inst;
695 
696 	sensor_inst = container_of(file->private_data,
697 				   struct hid_sensor_custom, custom_dev);
698 	/* We essentially have single reader and writer */
699 	if (test_and_set_bit(0, &sensor_inst->misc_opened))
700 		return -EBUSY;
701 
702 	return nonseekable_open(inode, file);
703 }
704 
705 static unsigned int hid_sensor_custom_poll(struct file *file,
706 					   struct poll_table_struct *wait)
707 {
708 	struct hid_sensor_custom *sensor_inst;
709 	unsigned int mask = 0;
710 
711 	sensor_inst = container_of(file->private_data,
712 				   struct hid_sensor_custom, custom_dev);
713 
714 	poll_wait(file, &sensor_inst->wait, wait);
715 
716 	if (!kfifo_is_empty(&sensor_inst->data_fifo))
717 		mask = POLLIN | POLLRDNORM;
718 
719 	return mask;
720 }
721 
722 static const struct file_operations hid_sensor_custom_fops = {
723 	.open =  hid_sensor_custom_open,
724 	.read =  hid_sensor_custom_read,
725 	.release = hid_sensor_custom_release,
726 	.poll = hid_sensor_custom_poll,
727 	.llseek = noop_llseek,
728 };
729 
730 static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
731 {
732 	int ret;
733 
734 	ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
735 			  GFP_KERNEL);
736 	if (ret)
737 		return ret;
738 
739 	init_waitqueue_head(&sensor_inst->wait);
740 
741 	sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
742 	sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
743 	sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
744 	ret = misc_register(&sensor_inst->custom_dev);
745 	if (ret) {
746 		kfifo_free(&sensor_inst->data_fifo);
747 		return ret;
748 	}
749 	return 0;
750 }
751 
752 static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
753 								*sensor_inst)
754 {
755 	wake_up(&sensor_inst->wait);
756 	misc_deregister(&sensor_inst->custom_dev);
757 	kfifo_free(&sensor_inst->data_fifo);
758 
759 }
760 
761 static int hid_sensor_custom_probe(struct platform_device *pdev)
762 {
763 	struct hid_sensor_custom *sensor_inst;
764 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
765 	int ret;
766 
767 	sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
768 				   GFP_KERNEL);
769 	if (!sensor_inst)
770 		return -ENOMEM;
771 
772 	sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
773 	sensor_inst->callbacks.send_event = hid_sensor_send_event;
774 	sensor_inst->callbacks.pdev = pdev;
775 	sensor_inst->hsdev = hsdev;
776 	sensor_inst->pdev = pdev;
777 	mutex_init(&sensor_inst->mutex);
778 	platform_set_drvdata(pdev, sensor_inst);
779 	ret = sensor_hub_register_callback(hsdev, hsdev->usage,
780 					   &sensor_inst->callbacks);
781 	if (ret < 0) {
782 		dev_err(&pdev->dev, "callback reg failed\n");
783 		return ret;
784 	}
785 
786 	ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
787 				 &enable_sensor_attr_group);
788 	if (ret)
789 		goto err_remove_callback;
790 
791 	ret = hid_sensor_custom_add_attributes(sensor_inst);
792 	if (ret)
793 		goto err_remove_group;
794 
795 	ret = hid_sensor_custom_dev_if_add(sensor_inst);
796 	if (ret)
797 		goto err_remove_attributes;
798 
799 	return 0;
800 
801 err_remove_attributes:
802 	hid_sensor_custom_remove_attributes(sensor_inst);
803 err_remove_group:
804 	sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
805 			   &enable_sensor_attr_group);
806 err_remove_callback:
807 	sensor_hub_remove_callback(hsdev, hsdev->usage);
808 
809 	return ret;
810 }
811 
812 static int hid_sensor_custom_remove(struct platform_device *pdev)
813 {
814 	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
815 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
816 
817 	hid_sensor_custom_dev_if_remove(sensor_inst);
818 	hid_sensor_custom_remove_attributes(sensor_inst);
819 	sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
820 			   &enable_sensor_attr_group);
821 	sensor_hub_remove_callback(hsdev, hsdev->usage);
822 
823 	return 0;
824 }
825 
826 static struct platform_device_id hid_sensor_custom_ids[] = {
827 	{
828 		.name = "HID-SENSOR-2000e1",
829 	},
830 	{
831 		.name = "HID-SENSOR-2000e2",
832 	},
833 	{ /* sentinel */ }
834 };
835 MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
836 
837 static struct platform_driver hid_sensor_custom_platform_driver = {
838 	.id_table = hid_sensor_custom_ids,
839 	.driver = {
840 		.name	= KBUILD_MODNAME,
841 	},
842 	.probe		= hid_sensor_custom_probe,
843 	.remove		= hid_sensor_custom_remove,
844 };
845 module_platform_driver(hid_sensor_custom_platform_driver);
846 
847 MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
848 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
849 MODULE_LICENSE("GPL");
850