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