1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * HID Sensors Driver
  4 * Copyright (c) 2012, Intel Corporation.
  5 */
  6
  7#include <linux/device.h>
  8#include <linux/hid.h>
  9#include <linux/module.h>
 10#include <linux/slab.h>
 11#include <linux/mfd/core.h>
 12#include <linux/list.h>
 13#include <linux/hid-sensor-ids.h>
 14#include <linux/hid-sensor-hub.h>
 15#include "hid-ids.h"
 16
 17#define HID_SENSOR_HUB_ENUM_QUIRK	0x01
 18
 19/**
 20 * struct sensor_hub_data - Hold a instance data for a HID hub device
 21 * @hsdev:		Stored hid instance for current hub device.
 22 * @mutex:		Mutex to serialize synchronous request.
 23 * @lock:		Spin lock to protect pending request structure.
 24 * @dyn_callback_list:	Holds callback function
 25 * @dyn_callback_lock:	spin lock to protect callback list
 26 * @hid_sensor_hub_client_devs:	Stores all MFD cells for a hub instance.
 27 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
 28 * @ref_cnt:		Number of MFD clients have opened this device
 29 */
 30struct sensor_hub_data {
 31	struct mutex mutex;
 32	spinlock_t lock;
 33	struct list_head dyn_callback_list;
 34	spinlock_t dyn_callback_lock;
 35	struct mfd_cell *hid_sensor_hub_client_devs;
 36	int hid_sensor_client_cnt;
 37	unsigned long quirks;
 38	int ref_cnt;
 39};
 40
 41/**
 42 * struct hid_sensor_hub_callbacks_list - Stores callback list
 43 * @list:		list head.
 44 * @usage_id:		usage id for a physical device.
 45 * @usage_callback:	Stores registered callback functions.
 46 * @priv:		Private data for a physical device.
 47 */
 48struct hid_sensor_hub_callbacks_list {
 49	struct list_head list;
 50	u32 usage_id;
 51	struct hid_sensor_hub_device *hsdev;
 52	struct hid_sensor_hub_callbacks *usage_callback;
 53	void *priv;
 54};
 55
 56static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
 57						int dir)
 58{
 59	struct hid_report *report;
 60
 61	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
 62		if (report->id == id)
 63			return report;
 64	}
 65	hid_warn(hdev, "No report with id 0x%x found\n", id);
 66
 67	return NULL;
 68}
 69
 70static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
 71{
 72	int i;
 73	int count = 0;
 74
 75	for (i = 0; i < hdev->maxcollection; ++i) {
 76		struct hid_collection *collection = &hdev->collection[i];
 77		if (collection->type == HID_COLLECTION_PHYSICAL ||
 78		    collection->type == HID_COLLECTION_APPLICATION)
 79			++count;
 80	}
 81
 82	return count;
 83}
 84
 85static void sensor_hub_fill_attr_info(
 86		struct hid_sensor_hub_attribute_info *info,
 87		s32 index, s32 report_id, struct hid_field *field)
 88{
 89	info->index = index;
 90	info->report_id = report_id;
 91	info->units = field->unit;
 92	info->unit_expo = field->unit_exponent;
 93	info->size = (field->report_size * field->report_count)/8;
 94	info->logical_minimum = field->logical_minimum;
 95	info->logical_maximum = field->logical_maximum;
 96}
 97
 98static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
 99					struct hid_device *hdev,
100					u32 usage_id,
101					int collection_index,
102					struct hid_sensor_hub_device **hsdev,
103					void **priv)
104{
105	struct hid_sensor_hub_callbacks_list *callback;
106	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
107	unsigned long flags;
108
109	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
110	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
111		if ((callback->usage_id == usage_id ||
112		     callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
113			(collection_index >=
114				callback->hsdev->start_collection_index) &&
115			(collection_index <
116				callback->hsdev->end_collection_index)) {
117			*priv = callback->priv;
118			*hsdev = callback->hsdev;
119			spin_unlock_irqrestore(&pdata->dyn_callback_lock,
120					       flags);
121			return callback->usage_callback;
122		}
123	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
124
125	return NULL;
126}
127
128int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
129			u32 usage_id,
130			struct hid_sensor_hub_callbacks *usage_callback)
131{
132	struct hid_sensor_hub_callbacks_list *callback;
133	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
134	unsigned long flags;
135
136	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
137	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
138		if (callback->usage_id == usage_id &&
139						callback->hsdev == hsdev) {
140			spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
141			return -EINVAL;
142		}
143	callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
144	if (!callback) {
145		spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
146		return -ENOMEM;
147	}
148	callback->hsdev = hsdev;
149	callback->usage_callback = usage_callback;
150	callback->usage_id = usage_id;
151	callback->priv = NULL;
152	/*
153	 * If there is a handler registered for the collection type, then
154	 * it will handle all reports for sensors in this collection. If
155	 * there is also an individual sensor handler registration, then
156	 * we want to make sure that the reports are directed to collection
157	 * handler, as this may be a fusion sensor. So add collection handlers
158	 * to the beginning of the list, so that they are matched first.
159	 */
160	if (usage_id == HID_USAGE_SENSOR_COLLECTION)
161		list_add(&callback->list, &pdata->dyn_callback_list);
162	else
163		list_add_tail(&callback->list, &pdata->dyn_callback_list);
164	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
165
166	return 0;
167}
168EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
169
170int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
171				u32 usage_id)
172{
173	struct hid_sensor_hub_callbacks_list *callback;
174	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
175	unsigned long flags;
176
177	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
178	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
179		if (callback->usage_id == usage_id &&
180						callback->hsdev == hsdev) {
181			list_del(&callback->list);
182			kfree(callback);
183			break;
184		}
185	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
186
187	return 0;
188}
189EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
190
191int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
192			   u32 field_index, int buffer_size, void *buffer)
193{
194	struct hid_report *report;
195	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
196	__s32 *buf32 = buffer;
197	int i = 0;
198	int remaining_bytes;
199	__s32 value;
200	int ret = 0;
201
202	mutex_lock(&data->mutex);
203	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
204	if (!report || (field_index >= report->maxfield)) {
205		ret = -EINVAL;
206		goto done_proc;
207	}
208
209	remaining_bytes = buffer_size % sizeof(__s32);
210	buffer_size = buffer_size / sizeof(__s32);
211	if (buffer_size) {
212		for (i = 0; i < buffer_size; ++i) {
213			hid_set_field(report->field[field_index], i,
214				      (__force __s32)cpu_to_le32(*buf32));
215			++buf32;
216		}
217	}
218	if (remaining_bytes) {
219		value = 0;
220		memcpy(&value, (u8 *)buf32, remaining_bytes);
221		hid_set_field(report->field[field_index], i,
222			      (__force __s32)cpu_to_le32(value));
223	}
224	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
225	hid_hw_wait(hsdev->hdev);
226
227done_proc:
228	mutex_unlock(&data->mutex);
229
230	return ret;
231}
232EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
233
234int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
235			   u32 field_index, int buffer_size, void *buffer)
236{
237	struct hid_report *report;
238	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
239	int report_size;
240	int ret = 0;
241	u8 *val_ptr;
242	int buffer_index = 0;
243	int i;
244
245	memset(buffer, 0, buffer_size);
246
247	mutex_lock(&data->mutex);
248	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
249	if (!report || (field_index >= report->maxfield) ||
250	    report->field[field_index]->report_count < 1) {
251		ret = -EINVAL;
252		goto done_proc;
253	}
254	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
255	hid_hw_wait(hsdev->hdev);
256
257	/* calculate number of bytes required to read this field */
258	report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
259				   8) *
260				   report->field[field_index]->report_count;
261	if (!report_size) {
262		ret = -EINVAL;
263		goto done_proc;
264	}
265	ret = min(report_size, buffer_size);
266
267	val_ptr = (u8 *)report->field[field_index]->value;
268	for (i = 0; i < report->field[field_index]->report_count; ++i) {
269		if (buffer_index >= ret)
270			break;
271
272		memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
273		       report->field[field_index]->report_size / 8);
274		val_ptr += sizeof(__s32);
275		buffer_index += (report->field[field_index]->report_size / 8);
276	}
277
278done_proc:
279	mutex_unlock(&data->mutex);
280
281	return ret;
282}
283EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
284
285
286int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
287					u32 usage_id,
288					u32 attr_usage_id, u32 report_id,
289					enum sensor_hub_read_flags flag,
290					bool is_signed)
291{
292	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
293	unsigned long flags;
294	struct hid_report *report;
295	int ret_val = 0;
296
297	report = sensor_hub_report(report_id, hsdev->hdev,
298				   HID_INPUT_REPORT);
299	if (!report)
300		return -EINVAL;
301
302	mutex_lock(hsdev->mutex_ptr);
303	if (flag == SENSOR_HUB_SYNC) {
304		memset(&hsdev->pending, 0, sizeof(hsdev->pending));
305		init_completion(&hsdev->pending.ready);
306		hsdev->pending.usage_id = usage_id;
307		hsdev->pending.attr_usage_id = attr_usage_id;
308		hsdev->pending.raw_size = 0;
309
310		spin_lock_irqsave(&data->lock, flags);
311		hsdev->pending.status = true;
312		spin_unlock_irqrestore(&data->lock, flags);
313	}
314	mutex_lock(&data->mutex);
315	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
316	mutex_unlock(&data->mutex);
317	if (flag == SENSOR_HUB_SYNC) {
318		wait_for_completion_interruptible_timeout(
319						&hsdev->pending.ready, HZ*5);
320		switch (hsdev->pending.raw_size) {
321		case 1:
322			if (is_signed)
323				ret_val = *(s8 *)hsdev->pending.raw_data;
324			else
325				ret_val = *(u8 *)hsdev->pending.raw_data;
326			break;
327		case 2:
328			if (is_signed)
329				ret_val = *(s16 *)hsdev->pending.raw_data;
330			else
331				ret_val = *(u16 *)hsdev->pending.raw_data;
332			break;
333		case 4:
334			ret_val = *(u32 *)hsdev->pending.raw_data;
335			break;
336		default:
337			ret_val = 0;
338		}
339		kfree(hsdev->pending.raw_data);
340		hsdev->pending.status = false;
341	}
342	mutex_unlock(hsdev->mutex_ptr);
343
344	return ret_val;
345}
346EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
347
348int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
349				u32 report_id, int field_index, u32 usage_id)
350{
351	struct hid_report *report;
352	struct hid_field *field;
353	int i;
354
355	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
356	if (!report || (field_index >= report->maxfield))
357		goto done_proc;
358
359	field = report->field[field_index];
360	for (i = 0; i < field->maxusage; ++i) {
361		if (field->usage[i].hid == usage_id)
362			return field->usage[i].usage_index;
363	}
364
365done_proc:
366	return -EINVAL;
367}
368EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
369
370int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
371				u8 type,
372				u32 usage_id,
373				u32 attr_usage_id,
374				struct hid_sensor_hub_attribute_info *info)
375{
376	int ret = -1;
377	int i;
378	struct hid_report *report;
379	struct hid_field *field;
380	struct hid_report_enum *report_enum;
381	struct hid_device *hdev = hsdev->hdev;
382
383	/* Initialize with defaults */
384	info->usage_id = usage_id;
385	info->attrib_id = attr_usage_id;
386	info->report_id = -1;
387	info->index = -1;
388	info->units = -1;
389	info->unit_expo = -1;
390
391	report_enum = &hdev->report_enum[type];
392	list_for_each_entry(report, &report_enum->report_list, list) {
393		for (i = 0; i < report->maxfield; ++i) {
394			field = report->field[i];
395			if (field->maxusage) {
396				if (field->physical == usage_id &&
397					(field->logical == attr_usage_id ||
398					field->usage[0].hid ==
399							attr_usage_id) &&
400					(field->usage[0].collection_index >=
401					hsdev->start_collection_index) &&
402					(field->usage[0].collection_index <
403					hsdev->end_collection_index)) {
404
405					sensor_hub_fill_attr_info(info, i,
406								report->id,
407								field);
408					ret = 0;
409					break;
410				}
411			}
412		}
413
414	}
415
416	return ret;
417}
418EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
419
420#ifdef CONFIG_PM
421static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
422{
423	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
424	struct hid_sensor_hub_callbacks_list *callback;
425	unsigned long flags;
426
427	hid_dbg(hdev, " sensor_hub_suspend\n");
428	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
429	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
430		if (callback->usage_callback->suspend)
431			callback->usage_callback->suspend(
432					callback->hsdev, callback->priv);
433	}
434	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
435
436	return 0;
437}
438
439static int sensor_hub_resume(struct hid_device *hdev)
440{
441	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
442	struct hid_sensor_hub_callbacks_list *callback;
443	unsigned long flags;
444
445	hid_dbg(hdev, " sensor_hub_resume\n");
446	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
447	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
448		if (callback->usage_callback->resume)
449			callback->usage_callback->resume(
450					callback->hsdev, callback->priv);
451	}
452	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
453
454	return 0;
455}
456
457static int sensor_hub_reset_resume(struct hid_device *hdev)
458{
459	return 0;
460}
461#endif
462
463/*
464 * Handle raw report as sent by device
465 */
466static int sensor_hub_raw_event(struct hid_device *hdev,
467		struct hid_report *report, u8 *raw_data, int size)
468{
469	int i;
470	u8 *ptr;
471	int sz;
472	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
473	unsigned long flags;
474	struct hid_sensor_hub_callbacks *callback = NULL;
475	struct hid_collection *collection = NULL;
476	void *priv = NULL;
477	struct hid_sensor_hub_device *hsdev = NULL;
478
479	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
480			 report->id, size, report->type);
481	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
482	if (report->type != HID_INPUT_REPORT)
483		return 1;
484
485	ptr = raw_data;
486	ptr++; /* Skip report id */
487
488	spin_lock_irqsave(&pdata->lock, flags);
489
490	for (i = 0; i < report->maxfield; ++i) {
491		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
492				i, report->field[i]->usage->collection_index,
493				report->field[i]->usage->hid,
494				(report->field[i]->report_size *
495					report->field[i]->report_count)/8);
496		sz = (report->field[i]->report_size *
497					report->field[i]->report_count)/8;
498		collection = &hdev->collection[
499				report->field[i]->usage->collection_index];
500		hid_dbg(hdev, "collection->usage %x\n",
501					collection->usage);
502
503		callback = sensor_hub_get_callback(hdev,
504				report->field[i]->physical,
505				report->field[i]->usage[0].collection_index,
506				&hsdev, &priv);
507		if (!callback) {
508			ptr += sz;
509			continue;
510		}
511		if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
512					      report->field[i]->usage->hid ||
513					      hsdev->pending.attr_usage_id ==
514					      report->field[i]->logical)) {
515			hid_dbg(hdev, "data was pending ...\n");
516			hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
517			if (hsdev->pending.raw_data)
518				hsdev->pending.raw_size = sz;
519			else
520				hsdev->pending.raw_size = 0;
521			complete(&hsdev->pending.ready);
522		}
523		if (callback->capture_sample) {
524			if (report->field[i]->logical)
525				callback->capture_sample(hsdev,
526					report->field[i]->logical, sz, ptr,
527					callback->pdev);
528			else
529				callback->capture_sample(hsdev,
530					report->field[i]->usage->hid, sz, ptr,
531					callback->pdev);
532		}
533		ptr += sz;
534	}
535	if (callback && collection && callback->send_event)
536		callback->send_event(hsdev, collection->usage,
537				callback->pdev);
538	spin_unlock_irqrestore(&pdata->lock, flags);
539
540	return 1;
541}
542
543int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
544{
545	int ret = 0;
546	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
547
548	mutex_lock(&data->mutex);
549	if (!data->ref_cnt) {
550		ret = hid_hw_open(hsdev->hdev);
551		if (ret) {
552			hid_err(hsdev->hdev, "failed to open hid device\n");
553			mutex_unlock(&data->mutex);
554			return ret;
555		}
556	}
557	data->ref_cnt++;
558	mutex_unlock(&data->mutex);
559
560	return ret;
561}
562EXPORT_SYMBOL_GPL(sensor_hub_device_open);
563
564void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
565{
566	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
567
568	mutex_lock(&data->mutex);
569	data->ref_cnt--;
570	if (!data->ref_cnt)
571		hid_hw_close(hsdev->hdev);
572	mutex_unlock(&data->mutex);
573}
574EXPORT_SYMBOL_GPL(sensor_hub_device_close);
575
576static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
577		unsigned int *rsize)
578{
579	/*
580	 * Checks if the report descriptor of Thinkpad Helix 2 has a logical
581	 * minimum for magnetic flux axis greater than the maximum.
582	 */
583	if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
584		*rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
585		rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
586		rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
587		rdesc[921] == 0x07 && rdesc[922] == 0x00) {
588		/* Sets negative logical minimum for mag x, y and z */
589		rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
590		rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
591		rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
592		rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
593	}
594
595	return rdesc;
596}
597
598static int sensor_hub_probe(struct hid_device *hdev,
599				const struct hid_device_id *id)
600{
601	int ret;
602	struct sensor_hub_data *sd;
603	int i;
604	char *name;
605	int dev_cnt;
606	struct hid_sensor_hub_device *hsdev;
607	struct hid_sensor_hub_device *last_hsdev = NULL;
608	struct hid_sensor_hub_device *collection_hsdev = NULL;
609
610	sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
611	if (!sd) {
612		hid_err(hdev, "cannot allocate Sensor data\n");
613		return -ENOMEM;
614	}
615
616	hid_set_drvdata(hdev, sd);
617	sd->quirks = id->driver_data;
618
619	spin_lock_init(&sd->lock);
620	spin_lock_init(&sd->dyn_callback_lock);
621	mutex_init(&sd->mutex);
622	ret = hid_parse(hdev);
623	if (ret) {
624		hid_err(hdev, "parse failed\n");
625		return ret;
626	}
627	INIT_LIST_HEAD(&hdev->inputs);
628
629	ret = hid_hw_start(hdev, 0);
630	if (ret) {
631		hid_err(hdev, "hw start failed\n");
632		return ret;
633	}
634	INIT_LIST_HEAD(&sd->dyn_callback_list);
635	sd->hid_sensor_client_cnt = 0;
636
637	dev_cnt = sensor_hub_get_physical_device_count(hdev);
638	if (dev_cnt > HID_MAX_PHY_DEVICES) {
639		hid_err(hdev, "Invalid Physical device count\n");
640		ret = -EINVAL;
641		goto err_stop_hw;
642	}
643	sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
644						      dev_cnt,
645						      sizeof(struct mfd_cell),
646						      GFP_KERNEL);
647	if (sd->hid_sensor_hub_client_devs == NULL) {
648		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
649		ret = -ENOMEM;
650		goto err_stop_hw;
651	}
652
653	for (i = 0; i < hdev->maxcollection; ++i) {
654		struct hid_collection *collection = &hdev->collection[i];
655
656		if (collection->type == HID_COLLECTION_PHYSICAL ||
657		    collection->type == HID_COLLECTION_APPLICATION) {
658
659			hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
660					     GFP_KERNEL);
661			if (!hsdev) {
662				hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
663				ret = -ENOMEM;
664				goto err_stop_hw;
665			}
666			hsdev->hdev = hdev;
667			hsdev->vendor_id = hdev->vendor;
668			hsdev->product_id = hdev->product;
669			hsdev->usage = collection->usage;
670			hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
671							sizeof(struct mutex),
672							GFP_KERNEL);
673			if (!hsdev->mutex_ptr) {
674				ret = -ENOMEM;
675				goto err_stop_hw;
676			}
677			mutex_init(hsdev->mutex_ptr);
678			hsdev->start_collection_index = i;
679			if (last_hsdev)
680				last_hsdev->end_collection_index = i;
681			last_hsdev = hsdev;
682			name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
683					      "HID-SENSOR-%x",
684					      collection->usage);
685			if (name == NULL) {
686				hid_err(hdev, "Failed MFD device name\n");
687				ret = -ENOMEM;
688				goto err_stop_hw;
689			}
690			sd->hid_sensor_hub_client_devs[
691				sd->hid_sensor_client_cnt].name = name;
692			sd->hid_sensor_hub_client_devs[
693				sd->hid_sensor_client_cnt].platform_data =
694							hsdev;
695			sd->hid_sensor_hub_client_devs[
696				sd->hid_sensor_client_cnt].pdata_size =
697							sizeof(*hsdev);
698			hid_dbg(hdev, "Adding %s:%d\n", name,
699					hsdev->start_collection_index);
700			sd->hid_sensor_client_cnt++;
701			if (collection_hsdev)
702				collection_hsdev->end_collection_index = i;
703			if (collection->type == HID_COLLECTION_APPLICATION &&
704			    collection->usage == HID_USAGE_SENSOR_COLLECTION)
705				collection_hsdev = hsdev;
706		}
707	}
708	if (last_hsdev)
709		last_hsdev->end_collection_index = i;
710	if (collection_hsdev)
711		collection_hsdev->end_collection_index = i;
712
713	ret = mfd_add_hotplug_devices(&hdev->dev,
714			sd->hid_sensor_hub_client_devs,
715			sd->hid_sensor_client_cnt);
716	if (ret < 0)
717		goto err_stop_hw;
718
719	return ret;
720
721err_stop_hw:
722	hid_hw_stop(hdev);
723
724	return ret;
725}
726
727static void sensor_hub_remove(struct hid_device *hdev)
728{
729	struct sensor_hub_data *data = hid_get_drvdata(hdev);
730	unsigned long flags;
731	int i;
732
733	hid_dbg(hdev, " hardware removed\n");
734	hid_hw_close(hdev);
735	hid_hw_stop(hdev);
736	spin_lock_irqsave(&data->lock, flags);
737	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
738		struct hid_sensor_hub_device *hsdev =
739			data->hid_sensor_hub_client_devs[i].platform_data;
740		if (hsdev->pending.status)
741			complete(&hsdev->pending.ready);
742	}
743	spin_unlock_irqrestore(&data->lock, flags);
744	mfd_remove_devices(&hdev->dev);
745	mutex_destroy(&data->mutex);
746}
747
748static const struct hid_device_id sensor_hub_devices[] = {
749	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
750		     HID_ANY_ID) },
751	{ }
752};
753MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
754
755static struct hid_driver sensor_hub_driver = {
756	.name = "hid-sensor-hub",
757	.id_table = sensor_hub_devices,
758	.probe = sensor_hub_probe,
759	.remove = sensor_hub_remove,
760	.raw_event = sensor_hub_raw_event,
761	.report_fixup = sensor_hub_report_fixup,
762#ifdef CONFIG_PM
763	.suspend = sensor_hub_suspend,
764	.resume = sensor_hub_resume,
765	.reset_resume = sensor_hub_reset_resume,
766#endif
767};
768module_hid_driver(sensor_hub_driver);
769
770MODULE_DESCRIPTION("HID Sensor Hub driver");
771MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
772MODULE_LICENSE("GPL");