xref: /linux/drivers/hid/hid-sensor-hub.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
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 			ret = hid_set_field(report->field[field_index], i,
213 					    (__force __s32)cpu_to_le32(*buf32));
214 			if (ret)
215 				goto done_proc;
216 
217 			++buf32;
218 		}
219 	}
220 	if (remaining_bytes) {
221 		value = 0;
222 		memcpy(&value, (u8 *)buf32, remaining_bytes);
223 		ret = hid_set_field(report->field[field_index], i,
224 				    (__force __s32)cpu_to_le32(value));
225 		if (ret)
226 			goto done_proc;
227 	}
228 	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
229 	hid_hw_wait(hsdev->hdev);
230 
231 done_proc:
232 	mutex_unlock(&data->mutex);
233 
234 	return ret;
235 }
236 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
237 
sensor_hub_get_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)238 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
239 			   u32 field_index, int buffer_size, void *buffer)
240 {
241 	struct hid_report *report;
242 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
243 	int report_size;
244 	int ret = 0;
245 	u8 *val_ptr;
246 	int buffer_index = 0;
247 	int i;
248 
249 	memset(buffer, 0, buffer_size);
250 
251 	mutex_lock(&data->mutex);
252 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
253 	if (!report || (field_index >= report->maxfield) ||
254 	    report->field[field_index]->report_count < 1) {
255 		ret = -EINVAL;
256 		goto done_proc;
257 	}
258 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
259 	hid_hw_wait(hsdev->hdev);
260 
261 	/* calculate number of bytes required to read this field */
262 	report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
263 				   8) *
264 				   report->field[field_index]->report_count;
265 	if (!report_size) {
266 		ret = -EINVAL;
267 		goto done_proc;
268 	}
269 	ret = min(report_size, buffer_size);
270 
271 	val_ptr = (u8 *)report->field[field_index]->value;
272 	for (i = 0; i < report->field[field_index]->report_count; ++i) {
273 		if (buffer_index >= ret)
274 			break;
275 
276 		memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
277 		       report->field[field_index]->report_size / 8);
278 		val_ptr += sizeof(__s32);
279 		buffer_index += (report->field[field_index]->report_size / 8);
280 	}
281 
282 done_proc:
283 	mutex_unlock(&data->mutex);
284 
285 	return ret;
286 }
287 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
288 
289 
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)290 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
291 					u32 usage_id,
292 					u32 attr_usage_id, u32 report_id,
293 					enum sensor_hub_read_flags flag,
294 					bool is_signed)
295 {
296 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
297 	unsigned long flags;
298 	struct hid_report *report;
299 	int ret_val = 0;
300 
301 	report = sensor_hub_report(report_id, hsdev->hdev,
302 				   HID_INPUT_REPORT);
303 	if (!report)
304 		return -EINVAL;
305 
306 	mutex_lock(hsdev->mutex_ptr);
307 	if (flag == SENSOR_HUB_SYNC) {
308 		memset(&hsdev->pending, 0, sizeof(hsdev->pending));
309 		init_completion(&hsdev->pending.ready);
310 		hsdev->pending.usage_id = usage_id;
311 		hsdev->pending.attr_usage_id = attr_usage_id;
312 		hsdev->pending.raw_size = 0;
313 
314 		spin_lock_irqsave(&data->lock, flags);
315 		hsdev->pending.status = true;
316 		spin_unlock_irqrestore(&data->lock, flags);
317 	}
318 	mutex_lock(&data->mutex);
319 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
320 	mutex_unlock(&data->mutex);
321 	if (flag == SENSOR_HUB_SYNC) {
322 		wait_for_completion_interruptible_timeout(
323 						&hsdev->pending.ready, HZ*5);
324 		switch (hsdev->pending.raw_size) {
325 		case 1:
326 			if (is_signed)
327 				ret_val = *(s8 *)hsdev->pending.raw_data;
328 			else
329 				ret_val = *(u8 *)hsdev->pending.raw_data;
330 			break;
331 		case 2:
332 			if (is_signed)
333 				ret_val = *(s16 *)hsdev->pending.raw_data;
334 			else
335 				ret_val = *(u16 *)hsdev->pending.raw_data;
336 			break;
337 		case 4:
338 			ret_val = *(u32 *)hsdev->pending.raw_data;
339 			break;
340 		default:
341 			ret_val = 0;
342 		}
343 		kfree(hsdev->pending.raw_data);
344 		hsdev->pending.status = false;
345 	}
346 	mutex_unlock(hsdev->mutex_ptr);
347 
348 	return ret_val;
349 }
350 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
351 
hid_sensor_get_usage_index(struct hid_sensor_hub_device * hsdev,u32 report_id,int field_index,u32 usage_id)352 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
353 				u32 report_id, int field_index, u32 usage_id)
354 {
355 	struct hid_report *report;
356 	struct hid_field *field;
357 	int i;
358 
359 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
360 	if (!report || (field_index >= report->maxfield))
361 		goto done_proc;
362 
363 	field = report->field[field_index];
364 	for (i = 0; i < field->maxusage; ++i) {
365 		if (field->usage[i].hid == usage_id)
366 			return field->usage[i].usage_index;
367 	}
368 
369 done_proc:
370 	return -EINVAL;
371 }
372 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
373 
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)374 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
375 				u8 type,
376 				u32 usage_id,
377 				u32 attr_usage_id,
378 				struct hid_sensor_hub_attribute_info *info)
379 {
380 	int ret = -1;
381 	int i;
382 	struct hid_report *report;
383 	struct hid_field *field;
384 	struct hid_report_enum *report_enum;
385 	struct hid_device *hdev = hsdev->hdev;
386 
387 	/* Initialize with defaults */
388 	info->usage_id = usage_id;
389 	info->attrib_id = attr_usage_id;
390 	info->report_id = -1;
391 	info->index = -1;
392 	info->units = -1;
393 	info->unit_expo = -1;
394 
395 	report_enum = &hdev->report_enum[type];
396 	list_for_each_entry(report, &report_enum->report_list, list) {
397 		for (i = 0; i < report->maxfield; ++i) {
398 			field = report->field[i];
399 			if (field->maxusage) {
400 				if ((field->physical == usage_id ||
401 				     field->application == usage_id) &&
402 					(field->logical == attr_usage_id ||
403 					field->usage[0].hid ==
404 							attr_usage_id) &&
405 					(field->usage[0].collection_index >=
406 					hsdev->start_collection_index) &&
407 					(field->usage[0].collection_index <
408 					hsdev->end_collection_index)) {
409 
410 					sensor_hub_fill_attr_info(info, i,
411 								report->id,
412 								field);
413 					ret = 0;
414 					break;
415 				}
416 			}
417 		}
418 
419 	}
420 
421 	return ret;
422 }
423 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
424 
425 #ifdef CONFIG_PM
sensor_hub_suspend(struct hid_device * hdev,pm_message_t message)426 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
427 {
428 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
429 	struct hid_sensor_hub_callbacks_list *callback;
430 	unsigned long flags;
431 
432 	hid_dbg(hdev, " sensor_hub_suspend\n");
433 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
434 	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
435 		if (callback->usage_callback->suspend)
436 			callback->usage_callback->suspend(
437 					callback->hsdev, callback->priv);
438 	}
439 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
440 
441 	return 0;
442 }
443 
sensor_hub_resume(struct hid_device * hdev)444 static int sensor_hub_resume(struct hid_device *hdev)
445 {
446 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
447 	struct hid_sensor_hub_callbacks_list *callback;
448 	unsigned long flags;
449 
450 	hid_dbg(hdev, " sensor_hub_resume\n");
451 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
452 	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
453 		if (callback->usage_callback->resume)
454 			callback->usage_callback->resume(
455 					callback->hsdev, callback->priv);
456 	}
457 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
458 
459 	return 0;
460 }
461 
sensor_hub_reset_resume(struct hid_device * hdev)462 static int sensor_hub_reset_resume(struct hid_device *hdev)
463 {
464 	return 0;
465 }
466 #endif
467 
468 /*
469  * Handle raw report as sent by device
470  */
sensor_hub_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * raw_data,int size)471 static int sensor_hub_raw_event(struct hid_device *hdev,
472 		struct hid_report *report, u8 *raw_data, int size)
473 {
474 	int i;
475 	u8 *ptr;
476 	int sz;
477 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
478 	unsigned long flags;
479 	struct hid_sensor_hub_callbacks *callback = NULL;
480 	struct hid_collection *collection = NULL;
481 	void *priv = NULL;
482 	struct hid_sensor_hub_device *hsdev = NULL;
483 
484 	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
485 			 report->id, size, report->type);
486 	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
487 	if (report->type != HID_INPUT_REPORT)
488 		return 1;
489 
490 	ptr = raw_data;
491 	if (report->id)
492 		ptr++; /* Skip report id */
493 
494 	spin_lock_irqsave(&pdata->lock, flags);
495 
496 	for (i = 0; i < report->maxfield; ++i) {
497 		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
498 				i, report->field[i]->usage->collection_index,
499 				report->field[i]->usage->hid,
500 				(report->field[i]->report_size *
501 					report->field[i]->report_count)/8);
502 		sz = (report->field[i]->report_size *
503 					report->field[i]->report_count)/8;
504 		collection = &hdev->collection[
505 				report->field[i]->usage->collection_index];
506 		hid_dbg(hdev, "collection->usage %x\n",
507 					collection->usage);
508 
509 		callback = sensor_hub_get_callback(hdev,
510 				report->field[i]->physical ? report->field[i]->physical :
511 							     report->field[i]->application,
512 				report->field[i]->usage[0].collection_index,
513 				&hsdev, &priv);
514 		if (!callback) {
515 			ptr += sz;
516 			continue;
517 		}
518 		if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
519 					      report->field[i]->usage->hid ||
520 					      hsdev->pending.attr_usage_id ==
521 					      report->field[i]->logical)) {
522 			hid_dbg(hdev, "data was pending ...\n");
523 			hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
524 			if (hsdev->pending.raw_data)
525 				hsdev->pending.raw_size = sz;
526 			else
527 				hsdev->pending.raw_size = 0;
528 			complete(&hsdev->pending.ready);
529 		}
530 		if (callback->capture_sample) {
531 			if (report->field[i]->logical)
532 				callback->capture_sample(hsdev,
533 					report->field[i]->logical, sz, ptr,
534 					callback->pdev);
535 			else
536 				callback->capture_sample(hsdev,
537 					report->field[i]->usage->hid, sz, ptr,
538 					callback->pdev);
539 		}
540 		ptr += sz;
541 	}
542 	if (callback && collection && callback->send_event)
543 		callback->send_event(hsdev, collection->usage,
544 				callback->pdev);
545 	spin_unlock_irqrestore(&pdata->lock, flags);
546 
547 	return 1;
548 }
549 
sensor_hub_device_open(struct hid_sensor_hub_device * hsdev)550 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
551 {
552 	int ret = 0;
553 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
554 
555 	mutex_lock(&data->mutex);
556 	if (!data->ref_cnt) {
557 		ret = hid_hw_open(hsdev->hdev);
558 		if (ret) {
559 			hid_err(hsdev->hdev, "failed to open hid device\n");
560 			mutex_unlock(&data->mutex);
561 			return ret;
562 		}
563 	}
564 	data->ref_cnt++;
565 	mutex_unlock(&data->mutex);
566 
567 	return ret;
568 }
569 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
570 
sensor_hub_device_close(struct hid_sensor_hub_device * hsdev)571 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
572 {
573 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
574 
575 	mutex_lock(&data->mutex);
576 	data->ref_cnt--;
577 	if (!data->ref_cnt)
578 		hid_hw_close(hsdev->hdev);
579 	mutex_unlock(&data->mutex);
580 }
581 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
582 
sensor_hub_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)583 static const __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
584 		unsigned int *rsize)
585 {
586 	/*
587 	 * Checks if the report descriptor of Thinkpad Helix 2 has a logical
588 	 * minimum for magnetic flux axis greater than the maximum.
589 	 */
590 	if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
591 		*rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
592 		rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
593 		rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
594 		rdesc[921] == 0x07 && rdesc[922] == 0x00) {
595 		/* Sets negative logical minimum for mag x, y and z */
596 		rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
597 		rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
598 		rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
599 		rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
600 	}
601 
602 	return rdesc;
603 }
604 
sensor_hub_probe(struct hid_device * hdev,const struct hid_device_id * id)605 static int sensor_hub_probe(struct hid_device *hdev,
606 				const struct hid_device_id *id)
607 {
608 	int ret;
609 	struct sensor_hub_data *sd;
610 	int i;
611 	char *name;
612 	int dev_cnt;
613 	struct hid_sensor_hub_device *hsdev;
614 	struct hid_sensor_hub_device *last_hsdev = NULL;
615 	struct hid_sensor_hub_device *collection_hsdev = NULL;
616 
617 	sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
618 	if (!sd) {
619 		hid_err(hdev, "cannot allocate Sensor data\n");
620 		return -ENOMEM;
621 	}
622 
623 	hid_set_drvdata(hdev, sd);
624 
625 	spin_lock_init(&sd->lock);
626 	spin_lock_init(&sd->dyn_callback_lock);
627 	mutex_init(&sd->mutex);
628 	ret = hid_parse(hdev);
629 	if (ret) {
630 		hid_err(hdev, "parse failed\n");
631 		return ret;
632 	}
633 	INIT_LIST_HEAD(&hdev->inputs);
634 
635 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT | HID_CONNECT_DRIVER);
636 	if (ret) {
637 		hid_err(hdev, "hw start failed\n");
638 		return ret;
639 	}
640 	INIT_LIST_HEAD(&sd->dyn_callback_list);
641 	sd->hid_sensor_client_cnt = 0;
642 
643 	dev_cnt = sensor_hub_get_physical_device_count(hdev);
644 	if (dev_cnt > HID_MAX_PHY_DEVICES) {
645 		hid_err(hdev, "Invalid Physical device count\n");
646 		ret = -EINVAL;
647 		goto err_stop_hw;
648 	}
649 	sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
650 						      dev_cnt,
651 						      sizeof(struct mfd_cell),
652 						      GFP_KERNEL);
653 	if (sd->hid_sensor_hub_client_devs == NULL) {
654 		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
655 		ret = -ENOMEM;
656 		goto err_stop_hw;
657 	}
658 
659 	for (i = 0; i < hdev->maxcollection; ++i) {
660 		struct hid_collection *collection = &hdev->collection[i];
661 
662 		if (collection->type == HID_COLLECTION_PHYSICAL ||
663 		    collection->type == HID_COLLECTION_APPLICATION) {
664 
665 			hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
666 					     GFP_KERNEL);
667 			if (!hsdev) {
668 				hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
669 				ret = -ENOMEM;
670 				goto err_stop_hw;
671 			}
672 			hsdev->hdev = hdev;
673 			hsdev->vendor_id = hdev->vendor;
674 			hsdev->product_id = hdev->product;
675 			hsdev->usage = collection->usage;
676 			hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
677 							sizeof(struct mutex),
678 							GFP_KERNEL);
679 			if (!hsdev->mutex_ptr) {
680 				ret = -ENOMEM;
681 				goto err_stop_hw;
682 			}
683 			mutex_init(hsdev->mutex_ptr);
684 			hsdev->start_collection_index = i;
685 			if (last_hsdev)
686 				last_hsdev->end_collection_index = i;
687 			last_hsdev = hsdev;
688 			name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
689 					      "HID-SENSOR-%x",
690 					      collection->usage);
691 			if (name == NULL) {
692 				hid_err(hdev, "Failed MFD device name\n");
693 				ret = -ENOMEM;
694 				goto err_stop_hw;
695 			}
696 			sd->hid_sensor_hub_client_devs[
697 				sd->hid_sensor_client_cnt].name = name;
698 			sd->hid_sensor_hub_client_devs[
699 				sd->hid_sensor_client_cnt].platform_data =
700 							hsdev;
701 			sd->hid_sensor_hub_client_devs[
702 				sd->hid_sensor_client_cnt].pdata_size =
703 							sizeof(*hsdev);
704 			hid_dbg(hdev, "Adding %s:%d\n", name,
705 					hsdev->start_collection_index);
706 			sd->hid_sensor_client_cnt++;
707 			if (collection_hsdev)
708 				collection_hsdev->end_collection_index = i;
709 			if (collection->type == HID_COLLECTION_APPLICATION &&
710 			    collection->usage == HID_USAGE_SENSOR_COLLECTION)
711 				collection_hsdev = hsdev;
712 		}
713 	}
714 	if (last_hsdev)
715 		last_hsdev->end_collection_index = i;
716 	if (collection_hsdev)
717 		collection_hsdev->end_collection_index = i;
718 
719 	ret = mfd_add_hotplug_devices(&hdev->dev,
720 			sd->hid_sensor_hub_client_devs,
721 			sd->hid_sensor_client_cnt);
722 	if (ret < 0)
723 		goto err_stop_hw;
724 
725 	return ret;
726 
727 err_stop_hw:
728 	hid_hw_stop(hdev);
729 
730 	return ret;
731 }
732 
sensor_hub_remove(struct hid_device * hdev)733 static void sensor_hub_remove(struct hid_device *hdev)
734 {
735 	struct sensor_hub_data *data = hid_get_drvdata(hdev);
736 	unsigned long flags;
737 	int i;
738 
739 	hid_dbg(hdev, " hardware removed\n");
740 	hid_hw_close(hdev);
741 	hid_hw_stop(hdev);
742 	spin_lock_irqsave(&data->lock, flags);
743 	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
744 		struct hid_sensor_hub_device *hsdev =
745 			data->hid_sensor_hub_client_devs[i].platform_data;
746 		if (hsdev->pending.status)
747 			complete(&hsdev->pending.ready);
748 	}
749 	spin_unlock_irqrestore(&data->lock, flags);
750 	mfd_remove_devices(&hdev->dev);
751 	mutex_destroy(&data->mutex);
752 }
753 
754 static const struct hid_device_id sensor_hub_devices[] = {
755 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
756 		     HID_ANY_ID) },
757 	{ }
758 };
759 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
760 
761 static struct hid_driver sensor_hub_driver = {
762 	.name = "hid-sensor-hub",
763 	.id_table = sensor_hub_devices,
764 	.probe = sensor_hub_probe,
765 	.remove = sensor_hub_remove,
766 	.raw_event = sensor_hub_raw_event,
767 	.report_fixup = sensor_hub_report_fixup,
768 #ifdef CONFIG_PM
769 	.suspend = sensor_hub_suspend,
770 	.resume = sensor_hub_resume,
771 	.reset_resume = sensor_hub_reset_resume,
772 #endif
773 };
774 module_hid_driver(sensor_hub_driver);
775 
776 MODULE_DESCRIPTION("HID Sensor Hub driver");
777 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
778 MODULE_LICENSE("GPL");
779