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1 /*
2  * HID Sensors Driver
3  * Copyright (c) 2012, Intel Corporation.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17  *
18  */
19 
20 #include <linux/device.h>
21 #include <linux/hid.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/mfd/core.h>
25 #include <linux/list.h>
26 #include <linux/hid-sensor-ids.h>
27 #include <linux/hid-sensor-hub.h>
28 #include "hid-ids.h"
29 
30 #define HID_SENSOR_HUB_ENUM_QUIRK	0x01
31 
32 /**
33  * struct sensor_hub_data - Hold a instance data for a HID hub device
34  * @hsdev:		Stored hid instance for current hub device.
35  * @mutex:		Mutex to serialize synchronous request.
36  * @lock:		Spin lock to protect pending request structure.
37  * @dyn_callback_list:	Holds callback function
38  * @dyn_callback_lock:	spin lock to protect callback list
39  * @hid_sensor_hub_client_devs:	Stores all MFD cells for a hub instance.
40  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
41  * @ref_cnt:		Number of MFD clients have opened this device
42  */
43 struct sensor_hub_data {
44 	struct mutex mutex;
45 	spinlock_t lock;
46 	struct list_head dyn_callback_list;
47 	spinlock_t dyn_callback_lock;
48 	struct mfd_cell *hid_sensor_hub_client_devs;
49 	int hid_sensor_client_cnt;
50 	unsigned long quirks;
51 	int ref_cnt;
52 };
53 
54 /**
55  * struct hid_sensor_hub_callbacks_list - Stores callback list
56  * @list:		list head.
57  * @usage_id:		usage id for a physical device.
58  * @usage_callback:	Stores registered callback functions.
59  * @priv:		Private data for a physical device.
60  */
61 struct hid_sensor_hub_callbacks_list {
62 	struct list_head list;
63 	u32 usage_id;
64 	struct hid_sensor_hub_device *hsdev;
65 	struct hid_sensor_hub_callbacks *usage_callback;
66 	void *priv;
67 };
68 
sensor_hub_report(int id,struct hid_device * hdev,int dir)69 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
70 						int dir)
71 {
72 	struct hid_report *report;
73 
74 	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
75 		if (report->id == id)
76 			return report;
77 	}
78 	hid_warn(hdev, "No report with id 0x%x found\n", id);
79 
80 	return NULL;
81 }
82 
sensor_hub_get_physical_device_count(struct hid_device * hdev)83 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
84 {
85 	int i;
86 	int count = 0;
87 
88 	for (i = 0; i < hdev->maxcollection; ++i) {
89 		struct hid_collection *collection = &hdev->collection[i];
90 		if (collection->type == HID_COLLECTION_PHYSICAL ||
91 		    collection->type == HID_COLLECTION_APPLICATION)
92 			++count;
93 	}
94 
95 	return count;
96 }
97 
sensor_hub_fill_attr_info(struct hid_sensor_hub_attribute_info * info,s32 index,s32 report_id,struct hid_field * field)98 static void sensor_hub_fill_attr_info(
99 		struct hid_sensor_hub_attribute_info *info,
100 		s32 index, s32 report_id, struct hid_field *field)
101 {
102 	info->index = index;
103 	info->report_id = report_id;
104 	info->units = field->unit;
105 	info->unit_expo = field->unit_exponent;
106 	info->size = (field->report_size * field->report_count)/8;
107 	info->logical_minimum = field->logical_minimum;
108 	info->logical_maximum = field->logical_maximum;
109 }
110 
sensor_hub_get_callback(struct hid_device * hdev,u32 usage_id,int collection_index,struct hid_sensor_hub_device ** hsdev,void ** priv)111 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
112 					struct hid_device *hdev,
113 					u32 usage_id,
114 					int collection_index,
115 					struct hid_sensor_hub_device **hsdev,
116 					void **priv)
117 {
118 	struct hid_sensor_hub_callbacks_list *callback;
119 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
120 	unsigned long flags;
121 
122 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
123 	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
124 		if ((callback->usage_id == usage_id ||
125 		     callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
126 			(collection_index >=
127 				callback->hsdev->start_collection_index) &&
128 			(collection_index <
129 				callback->hsdev->end_collection_index)) {
130 			*priv = callback->priv;
131 			*hsdev = callback->hsdev;
132 			spin_unlock_irqrestore(&pdata->dyn_callback_lock,
133 					       flags);
134 			return callback->usage_callback;
135 		}
136 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
137 
138 	return NULL;
139 }
140 
sensor_hub_register_callback(struct hid_sensor_hub_device * hsdev,u32 usage_id,struct hid_sensor_hub_callbacks * usage_callback)141 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
142 			u32 usage_id,
143 			struct hid_sensor_hub_callbacks *usage_callback)
144 {
145 	struct hid_sensor_hub_callbacks_list *callback;
146 	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
147 	unsigned long flags;
148 
149 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
150 	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
151 		if (callback->usage_id == usage_id &&
152 						callback->hsdev == hsdev) {
153 			spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
154 			return -EINVAL;
155 		}
156 	callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
157 	if (!callback) {
158 		spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
159 		return -ENOMEM;
160 	}
161 	callback->hsdev = hsdev;
162 	callback->usage_callback = usage_callback;
163 	callback->usage_id = usage_id;
164 	callback->priv = NULL;
165 	/*
166 	 * If there is a handler registered for the collection type, then
167 	 * it will handle all reports for sensors in this collection. If
168 	 * there is also an individual sensor handler registration, then
169 	 * we want to make sure that the reports are directed to collection
170 	 * handler, as this may be a fusion sensor. So add collection handlers
171 	 * to the beginning of the list, so that they are matched first.
172 	 */
173 	if (usage_id == HID_USAGE_SENSOR_COLLECTION)
174 		list_add(&callback->list, &pdata->dyn_callback_list);
175 	else
176 		list_add_tail(&callback->list, &pdata->dyn_callback_list);
177 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
178 
179 	return 0;
180 }
181 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
182 
sensor_hub_remove_callback(struct hid_sensor_hub_device * hsdev,u32 usage_id)183 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
184 				u32 usage_id)
185 {
186 	struct hid_sensor_hub_callbacks_list *callback;
187 	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
188 	unsigned long flags;
189 
190 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
191 	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
192 		if (callback->usage_id == usage_id &&
193 						callback->hsdev == hsdev) {
194 			list_del(&callback->list);
195 			kfree(callback);
196 			break;
197 		}
198 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
199 
200 	return 0;
201 }
202 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
203 
sensor_hub_set_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)204 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
205 			   u32 field_index, int buffer_size, void *buffer)
206 {
207 	struct hid_report *report;
208 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
209 	__s32 *buf32 = buffer;
210 	int i = 0;
211 	int remaining_bytes;
212 	__s32 value;
213 	int ret = 0;
214 
215 	mutex_lock(&data->mutex);
216 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
217 	if (!report || (field_index >= report->maxfield)) {
218 		ret = -EINVAL;
219 		goto done_proc;
220 	}
221 
222 	remaining_bytes = buffer_size % sizeof(__s32);
223 	buffer_size = buffer_size / sizeof(__s32);
224 	if (buffer_size) {
225 		for (i = 0; i < buffer_size; ++i) {
226 			hid_set_field(report->field[field_index], i,
227 				      (__force __s32)cpu_to_le32(*buf32));
228 			++buf32;
229 		}
230 	}
231 	if (remaining_bytes) {
232 		value = 0;
233 		memcpy(&value, (u8 *)buf32, remaining_bytes);
234 		hid_set_field(report->field[field_index], i,
235 			      (__force __s32)cpu_to_le32(value));
236 	}
237 	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
238 	hid_hw_wait(hsdev->hdev);
239 
240 done_proc:
241 	mutex_unlock(&data->mutex);
242 
243 	return ret;
244 }
245 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
246 
sensor_hub_get_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)247 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
248 			   u32 field_index, int buffer_size, void *buffer)
249 {
250 	struct hid_report *report;
251 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
252 	int report_size;
253 	int ret = 0;
254 	u8 *val_ptr;
255 	int buffer_index = 0;
256 	int i;
257 
258 	memset(buffer, 0, buffer_size);
259 
260 	mutex_lock(&data->mutex);
261 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
262 	if (!report || (field_index >= report->maxfield) ||
263 	    report->field[field_index]->report_count < 1) {
264 		ret = -EINVAL;
265 		goto done_proc;
266 	}
267 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
268 	hid_hw_wait(hsdev->hdev);
269 
270 	/* calculate number of bytes required to read this field */
271 	report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
272 				   8) *
273 				   report->field[field_index]->report_count;
274 	if (!report_size) {
275 		ret = -EINVAL;
276 		goto done_proc;
277 	}
278 	ret = min(report_size, buffer_size);
279 
280 	val_ptr = (u8 *)report->field[field_index]->value;
281 	for (i = 0; i < report->field[field_index]->report_count; ++i) {
282 		if (buffer_index >= ret)
283 			break;
284 
285 		memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
286 		       report->field[field_index]->report_size / 8);
287 		val_ptr += sizeof(__s32);
288 		buffer_index += (report->field[field_index]->report_size / 8);
289 	}
290 
291 done_proc:
292 	mutex_unlock(&data->mutex);
293 
294 	return ret;
295 }
296 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
297 
298 
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)299 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
300 					u32 usage_id,
301 					u32 attr_usage_id, u32 report_id,
302 					enum sensor_hub_read_flags flag)
303 {
304 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
305 	unsigned long flags;
306 	struct hid_report *report;
307 	int ret_val = 0;
308 
309 	report = sensor_hub_report(report_id, hsdev->hdev,
310 				   HID_INPUT_REPORT);
311 	if (!report)
312 		return -EINVAL;
313 
314 	mutex_lock(hsdev->mutex_ptr);
315 	if (flag == SENSOR_HUB_SYNC) {
316 		memset(&hsdev->pending, 0, sizeof(hsdev->pending));
317 		init_completion(&hsdev->pending.ready);
318 		hsdev->pending.usage_id = usage_id;
319 		hsdev->pending.attr_usage_id = attr_usage_id;
320 		hsdev->pending.raw_size = 0;
321 
322 		spin_lock_irqsave(&data->lock, flags);
323 		hsdev->pending.status = true;
324 		spin_unlock_irqrestore(&data->lock, flags);
325 	}
326 	mutex_lock(&data->mutex);
327 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
328 	mutex_unlock(&data->mutex);
329 	if (flag == SENSOR_HUB_SYNC) {
330 		wait_for_completion_interruptible_timeout(
331 						&hsdev->pending.ready, HZ*5);
332 		switch (hsdev->pending.raw_size) {
333 		case 1:
334 			ret_val = *(u8 *)hsdev->pending.raw_data;
335 			break;
336 		case 2:
337 			ret_val = *(u16 *)hsdev->pending.raw_data;
338 			break;
339 		case 4:
340 			ret_val = *(u32 *)hsdev->pending.raw_data;
341 			break;
342 		default:
343 			ret_val = 0;
344 		}
345 		kfree(hsdev->pending.raw_data);
346 		hsdev->pending.status = false;
347 	}
348 	mutex_unlock(hsdev->mutex_ptr);
349 
350 	return ret_val;
351 }
352 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
353 
hid_sensor_get_usage_index(struct hid_sensor_hub_device * hsdev,u32 report_id,int field_index,u32 usage_id)354 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
355 				u32 report_id, int field_index, u32 usage_id)
356 {
357 	struct hid_report *report;
358 	struct hid_field *field;
359 	int i;
360 
361 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
362 	if (!report || (field_index >= report->maxfield))
363 		goto done_proc;
364 
365 	field = report->field[field_index];
366 	for (i = 0; i < field->maxusage; ++i) {
367 		if (field->usage[i].hid == usage_id)
368 			return field->usage[i].usage_index;
369 	}
370 
371 done_proc:
372 	return -EINVAL;
373 }
374 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
375 
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)376 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
377 				u8 type,
378 				u32 usage_id,
379 				u32 attr_usage_id,
380 				struct hid_sensor_hub_attribute_info *info)
381 {
382 	int ret = -1;
383 	int i;
384 	struct hid_report *report;
385 	struct hid_field *field;
386 	struct hid_report_enum *report_enum;
387 	struct hid_device *hdev = hsdev->hdev;
388 
389 	/* Initialize with defaults */
390 	info->usage_id = usage_id;
391 	info->attrib_id = attr_usage_id;
392 	info->report_id = -1;
393 	info->index = -1;
394 	info->units = -1;
395 	info->unit_expo = -1;
396 
397 	report_enum = &hdev->report_enum[type];
398 	list_for_each_entry(report, &report_enum->report_list, list) {
399 		for (i = 0; i < report->maxfield; ++i) {
400 			field = report->field[i];
401 			if (field->maxusage) {
402 				if (field->physical == usage_id &&
403 					(field->logical == attr_usage_id ||
404 					field->usage[0].hid ==
405 							attr_usage_id) &&
406 					(field->usage[0].collection_index >=
407 					hsdev->start_collection_index) &&
408 					(field->usage[0].collection_index <
409 					hsdev->end_collection_index)) {
410 
411 					sensor_hub_fill_attr_info(info, i,
412 								report->id,
413 								field);
414 					ret = 0;
415 					break;
416 				}
417 			}
418 		}
419 
420 	}
421 
422 	return ret;
423 }
424 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
425 
426 #ifdef CONFIG_PM
sensor_hub_suspend(struct hid_device * hdev,pm_message_t message)427 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
428 {
429 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
430 	struct hid_sensor_hub_callbacks_list *callback;
431 	unsigned long flags;
432 
433 	hid_dbg(hdev, " sensor_hub_suspend\n");
434 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
435 	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
436 		if (callback->usage_callback->suspend)
437 			callback->usage_callback->suspend(
438 					callback->hsdev, callback->priv);
439 	}
440 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
441 
442 	return 0;
443 }
444 
sensor_hub_resume(struct hid_device * hdev)445 static int sensor_hub_resume(struct hid_device *hdev)
446 {
447 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
448 	struct hid_sensor_hub_callbacks_list *callback;
449 	unsigned long flags;
450 
451 	hid_dbg(hdev, " sensor_hub_resume\n");
452 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
453 	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
454 		if (callback->usage_callback->resume)
455 			callback->usage_callback->resume(
456 					callback->hsdev, callback->priv);
457 	}
458 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
459 
460 	return 0;
461 }
462 
sensor_hub_reset_resume(struct hid_device * hdev)463 static int sensor_hub_reset_resume(struct hid_device *hdev)
464 {
465 	return 0;
466 }
467 #endif
468 
469 /*
470  * Handle raw report as sent by device
471  */
sensor_hub_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * raw_data,int size)472 static int sensor_hub_raw_event(struct hid_device *hdev,
473 		struct hid_report *report, u8 *raw_data, int size)
474 {
475 	int i;
476 	u8 *ptr;
477 	int sz;
478 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
479 	unsigned long flags;
480 	struct hid_sensor_hub_callbacks *callback = NULL;
481 	struct hid_collection *collection = NULL;
482 	void *priv = NULL;
483 	struct hid_sensor_hub_device *hsdev = NULL;
484 
485 	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
486 			 report->id, size, report->type);
487 	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
488 	if (report->type != HID_INPUT_REPORT)
489 		return 1;
490 
491 	ptr = raw_data;
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,
511 				report->field[i]->usage[0].collection_index,
512 				&hsdev, &priv);
513 		if (!callback) {
514 			ptr += sz;
515 			continue;
516 		}
517 		if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
518 					      report->field[i]->usage->hid ||
519 					      hsdev->pending.attr_usage_id ==
520 					      report->field[i]->logical)) {
521 			hid_dbg(hdev, "data was pending ...\n");
522 			hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
523 			if (hsdev->pending.raw_data)
524 				hsdev->pending.raw_size = sz;
525 			else
526 				hsdev->pending.raw_size = 0;
527 			complete(&hsdev->pending.ready);
528 		}
529 		if (callback->capture_sample) {
530 			if (report->field[i]->logical)
531 				callback->capture_sample(hsdev,
532 					report->field[i]->logical, sz, ptr,
533 					callback->pdev);
534 			else
535 				callback->capture_sample(hsdev,
536 					report->field[i]->usage->hid, sz, ptr,
537 					callback->pdev);
538 		}
539 		ptr += sz;
540 	}
541 	if (callback && collection && callback->send_event)
542 		callback->send_event(hsdev, collection->usage,
543 				callback->pdev);
544 	spin_unlock_irqrestore(&pdata->lock, flags);
545 
546 	return 1;
547 }
548 
sensor_hub_device_open(struct hid_sensor_hub_device * hsdev)549 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
550 {
551 	int ret = 0;
552 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
553 
554 	mutex_lock(&data->mutex);
555 	if (!data->ref_cnt) {
556 		ret = hid_hw_open(hsdev->hdev);
557 		if (ret) {
558 			hid_err(hsdev->hdev, "failed to open hid device\n");
559 			mutex_unlock(&data->mutex);
560 			return ret;
561 		}
562 	}
563 	data->ref_cnt++;
564 	mutex_unlock(&data->mutex);
565 
566 	return ret;
567 }
568 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
569 
sensor_hub_device_close(struct hid_sensor_hub_device * hsdev)570 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
571 {
572 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
573 
574 	mutex_lock(&data->mutex);
575 	data->ref_cnt--;
576 	if (!data->ref_cnt)
577 		hid_hw_close(hsdev->hdev);
578 	mutex_unlock(&data->mutex);
579 }
580 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
581 
sensor_hub_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)582 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
583 		unsigned int *rsize)
584 {
585 	int index;
586 	struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
587 	unsigned char report_block[] = {
588 				0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
589 	unsigned char power_block[] = {
590 				0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
591 
592 	if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
593 		hid_dbg(hdev, "No Enum quirks\n");
594 		return rdesc;
595 	}
596 
597 	/* Looks for power and report state usage id and force to 1 */
598 	for (index = 0; index < *rsize; ++index) {
599 		if (((*rsize - index) > sizeof(report_block)) &&
600 			!memcmp(&rdesc[index], report_block,
601 						sizeof(report_block))) {
602 			rdesc[index + 4] = 0x01;
603 			index += sizeof(report_block);
604 		}
605 		if (((*rsize - index) > sizeof(power_block)) &&
606 			!memcmp(&rdesc[index], power_block,
607 						sizeof(power_block))) {
608 			rdesc[index + 4] = 0x01;
609 			index += sizeof(power_block);
610 		}
611 	}
612 
613 	/* Checks if the report descriptor of Thinkpad Helix 2 has a logical
614 	 * minimum for magnetic flux axis greater than the maximum */
615 	if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
616 		*rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
617 		rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
618 		rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
619 		rdesc[921] == 0x07 && rdesc[922] == 0x00) {
620 		/* Sets negative logical minimum for mag x, y and z */
621 		rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
622 		rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
623 		rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
624 		rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
625 	}
626 
627 	return rdesc;
628 }
629 
sensor_hub_probe(struct hid_device * hdev,const struct hid_device_id * id)630 static int sensor_hub_probe(struct hid_device *hdev,
631 				const struct hid_device_id *id)
632 {
633 	int ret;
634 	struct sensor_hub_data *sd;
635 	int i;
636 	char *name;
637 	int dev_cnt;
638 	struct hid_sensor_hub_device *hsdev;
639 	struct hid_sensor_hub_device *last_hsdev = NULL;
640 	struct hid_sensor_hub_device *collection_hsdev = NULL;
641 
642 	sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
643 	if (!sd) {
644 		hid_err(hdev, "cannot allocate Sensor data\n");
645 		return -ENOMEM;
646 	}
647 
648 	hid_set_drvdata(hdev, sd);
649 	sd->quirks = id->driver_data;
650 
651 	spin_lock_init(&sd->lock);
652 	spin_lock_init(&sd->dyn_callback_lock);
653 	mutex_init(&sd->mutex);
654 	ret = hid_parse(hdev);
655 	if (ret) {
656 		hid_err(hdev, "parse failed\n");
657 		return ret;
658 	}
659 	INIT_LIST_HEAD(&hdev->inputs);
660 
661 	ret = hid_hw_start(hdev, 0);
662 	if (ret) {
663 		hid_err(hdev, "hw start failed\n");
664 		return ret;
665 	}
666 	INIT_LIST_HEAD(&sd->dyn_callback_list);
667 	sd->hid_sensor_client_cnt = 0;
668 
669 	dev_cnt = sensor_hub_get_physical_device_count(hdev);
670 	if (dev_cnt > HID_MAX_PHY_DEVICES) {
671 		hid_err(hdev, "Invalid Physical device count\n");
672 		ret = -EINVAL;
673 		goto err_stop_hw;
674 	}
675 	sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
676 						      sizeof(struct mfd_cell),
677 						      GFP_KERNEL);
678 	if (sd->hid_sensor_hub_client_devs == NULL) {
679 		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
680 		ret = -ENOMEM;
681 		goto err_stop_hw;
682 	}
683 
684 	for (i = 0; i < hdev->maxcollection; ++i) {
685 		struct hid_collection *collection = &hdev->collection[i];
686 
687 		if (collection->type == HID_COLLECTION_PHYSICAL ||
688 		    collection->type == HID_COLLECTION_APPLICATION) {
689 
690 			hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
691 					     GFP_KERNEL);
692 			if (!hsdev) {
693 				hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
694 				ret = -ENOMEM;
695 				goto err_stop_hw;
696 			}
697 			hsdev->hdev = hdev;
698 			hsdev->vendor_id = hdev->vendor;
699 			hsdev->product_id = hdev->product;
700 			hsdev->usage = collection->usage;
701 			hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
702 							sizeof(struct mutex),
703 							GFP_KERNEL);
704 			if (!hsdev->mutex_ptr) {
705 				ret = -ENOMEM;
706 				goto err_stop_hw;
707 			}
708 			mutex_init(hsdev->mutex_ptr);
709 			hsdev->start_collection_index = i;
710 			if (last_hsdev)
711 				last_hsdev->end_collection_index = i;
712 			last_hsdev = hsdev;
713 			name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
714 					      "HID-SENSOR-%x",
715 					      collection->usage);
716 			if (name == NULL) {
717 				hid_err(hdev, "Failed MFD device name\n");
718 				ret = -ENOMEM;
719 				goto err_stop_hw;
720 			}
721 			sd->hid_sensor_hub_client_devs[
722 				sd->hid_sensor_client_cnt].name = name;
723 			sd->hid_sensor_hub_client_devs[
724 				sd->hid_sensor_client_cnt].platform_data =
725 							hsdev;
726 			sd->hid_sensor_hub_client_devs[
727 				sd->hid_sensor_client_cnt].pdata_size =
728 							sizeof(*hsdev);
729 			hid_dbg(hdev, "Adding %s:%d\n", name,
730 					hsdev->start_collection_index);
731 			sd->hid_sensor_client_cnt++;
732 			if (collection_hsdev)
733 				collection_hsdev->end_collection_index = i;
734 			if (collection->type == HID_COLLECTION_APPLICATION &&
735 			    collection->usage == HID_USAGE_SENSOR_COLLECTION)
736 				collection_hsdev = hsdev;
737 		}
738 	}
739 	if (last_hsdev)
740 		last_hsdev->end_collection_index = i;
741 	if (collection_hsdev)
742 		collection_hsdev->end_collection_index = i;
743 
744 	ret = mfd_add_hotplug_devices(&hdev->dev,
745 			sd->hid_sensor_hub_client_devs,
746 			sd->hid_sensor_client_cnt);
747 	if (ret < 0)
748 		goto err_stop_hw;
749 
750 	return ret;
751 
752 err_stop_hw:
753 	hid_hw_stop(hdev);
754 
755 	return ret;
756 }
757 
sensor_hub_remove(struct hid_device * hdev)758 static void sensor_hub_remove(struct hid_device *hdev)
759 {
760 	struct sensor_hub_data *data = hid_get_drvdata(hdev);
761 	unsigned long flags;
762 	int i;
763 
764 	hid_dbg(hdev, " hardware removed\n");
765 	hid_hw_close(hdev);
766 	hid_hw_stop(hdev);
767 	spin_lock_irqsave(&data->lock, flags);
768 	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
769 		struct hid_sensor_hub_device *hsdev =
770 			data->hid_sensor_hub_client_devs[i].platform_data;
771 		if (hsdev->pending.status)
772 			complete(&hsdev->pending.ready);
773 	}
774 	spin_unlock_irqrestore(&data->lock, flags);
775 	mfd_remove_devices(&hdev->dev);
776 	hid_set_drvdata(hdev, NULL);
777 	mutex_destroy(&data->mutex);
778 }
779 
780 static const struct hid_device_id sensor_hub_devices[] = {
781 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
782 			USB_DEVICE_ID_INTEL_HID_SENSOR_0),
783 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
784 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
785 			USB_DEVICE_ID_INTEL_HID_SENSOR_0),
786 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
787 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
788 			USB_DEVICE_ID_INTEL_HID_SENSOR_1),
789 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
790 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
791 			USB_DEVICE_ID_MS_SURFACE_PRO_2),
792 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
793 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
794 			USB_DEVICE_ID_MS_TOUCH_COVER_2),
795 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
796 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
797 			USB_DEVICE_ID_MS_TYPE_COVER_2),
798 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
799 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
800 			0x07bd), /* Microsoft Surface 3 */
801 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
802 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROCHIP,
803 			0x0f01), /* MM7150 */
804 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
805 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
806 			USB_DEVICE_ID_STM_HID_SENSOR),
807 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
808 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
809 			USB_DEVICE_ID_STM_HID_SENSOR_1),
810 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
811 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
812 			USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
813 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
814 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
815 			USB_DEVICE_ID_ITE_LENOVO_YOGA),
816 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
817 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
818 			USB_DEVICE_ID_ITE_LENOVO_YOGA2),
819 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
820 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
821 			USB_DEVICE_ID_ITE_LENOVO_YOGA900),
822 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
823 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
824 			0x22D8),
825 			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
826 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
827 		     HID_ANY_ID) },
828 	{ }
829 };
830 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
831 
832 static struct hid_driver sensor_hub_driver = {
833 	.name = "hid-sensor-hub",
834 	.id_table = sensor_hub_devices,
835 	.probe = sensor_hub_probe,
836 	.remove = sensor_hub_remove,
837 	.raw_event = sensor_hub_raw_event,
838 	.report_fixup = sensor_hub_report_fixup,
839 #ifdef CONFIG_PM
840 	.suspend = sensor_hub_suspend,
841 	.resume = sensor_hub_resume,
842 	.reset_resume = sensor_hub_reset_resume,
843 #endif
844 };
845 module_hid_driver(sensor_hub_driver);
846 
847 MODULE_DESCRIPTION("HID Sensor Hub driver");
848 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
849 MODULE_LICENSE("GPL");
850