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