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 			ret = hid_set_field(report->field[field_index], i,
227 					    (__force __s32)cpu_to_le32(*buf32));
228 			if (ret)
229 				goto done_proc;
230 
231 			++buf32;
232 		}
233 	}
234 	if (remaining_bytes) {
235 		value = 0;
236 		memcpy(&value, (u8 *)buf32, remaining_bytes);
237 		ret = hid_set_field(report->field[field_index], i,
238 				    (__force __s32)cpu_to_le32(value));
239 		if (ret)
240 			goto done_proc;
241 	}
242 	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
243 	hid_hw_wait(hsdev->hdev);
244 
245 done_proc:
246 	mutex_unlock(&data->mutex);
247 
248 	return ret;
249 }
250 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
251 
sensor_hub_get_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)252 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
253 			   u32 field_index, int buffer_size, void *buffer)
254 {
255 	struct hid_report *report;
256 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
257 	int report_size;
258 	int ret = 0;
259 	u8 *val_ptr;
260 	int buffer_index = 0;
261 	int i;
262 
263 	memset(buffer, 0, buffer_size);
264 
265 	mutex_lock(&data->mutex);
266 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
267 	if (!report || (field_index >= report->maxfield) ||
268 	    report->field[field_index]->report_count < 1) {
269 		ret = -EINVAL;
270 		goto done_proc;
271 	}
272 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
273 	hid_hw_wait(hsdev->hdev);
274 
275 	/* calculate number of bytes required to read this field */
276 	report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
277 				   8) *
278 				   report->field[field_index]->report_count;
279 	if (!report_size) {
280 		ret = -EINVAL;
281 		goto done_proc;
282 	}
283 	ret = min(report_size, buffer_size);
284 
285 	val_ptr = (u8 *)report->field[field_index]->value;
286 	for (i = 0; i < report->field[field_index]->report_count; ++i) {
287 		if (buffer_index >= ret)
288 			break;
289 
290 		memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
291 		       report->field[field_index]->report_size / 8);
292 		val_ptr += sizeof(__s32);
293 		buffer_index += (report->field[field_index]->report_size / 8);
294 	}
295 
296 done_proc:
297 	mutex_unlock(&data->mutex);
298 
299 	return ret;
300 }
301 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
302 
303 
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)304 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
305 					u32 usage_id,
306 					u32 attr_usage_id, u32 report_id,
307 					enum sensor_hub_read_flags flag,
308 					bool is_signed)
309 {
310 	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
311 	unsigned long flags;
312 	struct hid_report *report;
313 	int ret_val = 0;
314 
315 	report = sensor_hub_report(report_id, hsdev->hdev,
316 				   HID_INPUT_REPORT);
317 	if (!report)
318 		return -EINVAL;
319 
320 	mutex_lock(hsdev->mutex_ptr);
321 	if (flag == SENSOR_HUB_SYNC) {
322 		memset(&hsdev->pending, 0, sizeof(hsdev->pending));
323 		init_completion(&hsdev->pending.ready);
324 		hsdev->pending.usage_id = usage_id;
325 		hsdev->pending.attr_usage_id = attr_usage_id;
326 		hsdev->pending.raw_size = 0;
327 
328 		spin_lock_irqsave(&data->lock, flags);
329 		hsdev->pending.status = true;
330 		spin_unlock_irqrestore(&data->lock, flags);
331 	}
332 	mutex_lock(&data->mutex);
333 	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
334 	mutex_unlock(&data->mutex);
335 	if (flag == SENSOR_HUB_SYNC) {
336 		wait_for_completion_interruptible_timeout(
337 						&hsdev->pending.ready, HZ*5);
338 		switch (hsdev->pending.raw_size) {
339 		case 1:
340 			if (is_signed)
341 				ret_val = *(s8 *)hsdev->pending.raw_data;
342 			else
343 				ret_val = *(u8 *)hsdev->pending.raw_data;
344 			break;
345 		case 2:
346 			if (is_signed)
347 				ret_val = *(s16 *)hsdev->pending.raw_data;
348 			else
349 				ret_val = *(u16 *)hsdev->pending.raw_data;
350 			break;
351 		case 4:
352 			ret_val = *(u32 *)hsdev->pending.raw_data;
353 			break;
354 		default:
355 			ret_val = 0;
356 		}
357 		kfree(hsdev->pending.raw_data);
358 		hsdev->pending.status = false;
359 	}
360 	mutex_unlock(hsdev->mutex_ptr);
361 
362 	return ret_val;
363 }
364 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
365 
hid_sensor_get_usage_index(struct hid_sensor_hub_device * hsdev,u32 report_id,int field_index,u32 usage_id)366 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
367 				u32 report_id, int field_index, u32 usage_id)
368 {
369 	struct hid_report *report;
370 	struct hid_field *field;
371 	int i;
372 
373 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
374 	if (!report || (field_index >= report->maxfield))
375 		goto done_proc;
376 
377 	field = report->field[field_index];
378 	for (i = 0; i < field->maxusage; ++i) {
379 		if (field->usage[i].hid == usage_id)
380 			return field->usage[i].usage_index;
381 	}
382 
383 done_proc:
384 	return -EINVAL;
385 }
386 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
387 
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)388 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
389 				u8 type,
390 				u32 usage_id,
391 				u32 attr_usage_id,
392 				struct hid_sensor_hub_attribute_info *info)
393 {
394 	int ret = -1;
395 	int i;
396 	struct hid_report *report;
397 	struct hid_field *field;
398 	struct hid_report_enum *report_enum;
399 	struct hid_device *hdev = hsdev->hdev;
400 
401 	/* Initialize with defaults */
402 	info->usage_id = usage_id;
403 	info->attrib_id = attr_usage_id;
404 	info->report_id = -1;
405 	info->index = -1;
406 	info->units = -1;
407 	info->unit_expo = -1;
408 
409 	report_enum = &hdev->report_enum[type];
410 	list_for_each_entry(report, &report_enum->report_list, list) {
411 		for (i = 0; i < report->maxfield; ++i) {
412 			field = report->field[i];
413 			if (field->maxusage) {
414 				if (field->physical == usage_id &&
415 					(field->logical == attr_usage_id ||
416 					field->usage[0].hid ==
417 							attr_usage_id) &&
418 					(field->usage[0].collection_index >=
419 					hsdev->start_collection_index) &&
420 					(field->usage[0].collection_index <
421 					hsdev->end_collection_index)) {
422 
423 					sensor_hub_fill_attr_info(info, i,
424 								report->id,
425 								field);
426 					ret = 0;
427 					break;
428 				}
429 			}
430 		}
431 
432 	}
433 
434 	return ret;
435 }
436 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
437 
438 #ifdef CONFIG_PM
sensor_hub_suspend(struct hid_device * hdev,pm_message_t message)439 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
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_suspend\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->suspend)
449 			callback->usage_callback->suspend(
450 					callback->hsdev, callback->priv);
451 	}
452 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
453 
454 	return 0;
455 }
456 
sensor_hub_resume(struct hid_device * hdev)457 static int sensor_hub_resume(struct hid_device *hdev)
458 {
459 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
460 	struct hid_sensor_hub_callbacks_list *callback;
461 	unsigned long flags;
462 
463 	hid_dbg(hdev, " sensor_hub_resume\n");
464 	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
465 	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
466 		if (callback->usage_callback->resume)
467 			callback->usage_callback->resume(
468 					callback->hsdev, callback->priv);
469 	}
470 	spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
471 
472 	return 0;
473 }
474 
sensor_hub_reset_resume(struct hid_device * hdev)475 static int sensor_hub_reset_resume(struct hid_device *hdev)
476 {
477 	return 0;
478 }
479 #endif
480 
481 /*
482  * Handle raw report as sent by device
483  */
sensor_hub_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * raw_data,int size)484 static int sensor_hub_raw_event(struct hid_device *hdev,
485 		struct hid_report *report, u8 *raw_data, int size)
486 {
487 	int i;
488 	u8 *ptr;
489 	int sz;
490 	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
491 	unsigned long flags;
492 	struct hid_sensor_hub_callbacks *callback = NULL;
493 	struct hid_collection *collection = NULL;
494 	void *priv = NULL;
495 	struct hid_sensor_hub_device *hsdev = NULL;
496 
497 	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
498 			 report->id, size, report->type);
499 	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
500 	if (report->type != HID_INPUT_REPORT)
501 		return 1;
502 
503 	ptr = raw_data;
504 	if (report->id)
505 		ptr++; /* Skip report id */
506 
507 	spin_lock_irqsave(&pdata->lock, flags);
508 
509 	for (i = 0; i < report->maxfield; ++i) {
510 		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
511 				i, report->field[i]->usage->collection_index,
512 				report->field[i]->usage->hid,
513 				(report->field[i]->report_size *
514 					report->field[i]->report_count)/8);
515 		sz = (report->field[i]->report_size *
516 					report->field[i]->report_count)/8;
517 		collection = &hdev->collection[
518 				report->field[i]->usage->collection_index];
519 		hid_dbg(hdev, "collection->usage %x\n",
520 					collection->usage);
521 
522 		callback = sensor_hub_get_callback(hdev,
523 				report->field[i]->physical,
524 				report->field[i]->usage[0].collection_index,
525 				&hsdev, &priv);
526 		if (!callback) {
527 			ptr += sz;
528 			continue;
529 		}
530 		if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
531 					      report->field[i]->usage->hid ||
532 					      hsdev->pending.attr_usage_id ==
533 					      report->field[i]->logical)) {
534 			hid_dbg(hdev, "data was pending ...\n");
535 			hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
536 			if (hsdev->pending.raw_data)
537 				hsdev->pending.raw_size = sz;
538 			else
539 				hsdev->pending.raw_size = 0;
540 			complete(&hsdev->pending.ready);
541 		}
542 		if (callback->capture_sample) {
543 			if (report->field[i]->logical)
544 				callback->capture_sample(hsdev,
545 					report->field[i]->logical, sz, ptr,
546 					callback->pdev);
547 			else
548 				callback->capture_sample(hsdev,
549 					report->field[i]->usage->hid, sz, ptr,
550 					callback->pdev);
551 		}
552 		ptr += sz;
553 	}
554 	if (callback && collection && callback->send_event)
555 		callback->send_event(hsdev, collection->usage,
556 				callback->pdev);
557 	spin_unlock_irqrestore(&pdata->lock, flags);
558 
559 	return 1;
560 }
561 
sensor_hub_device_open(struct hid_sensor_hub_device * hsdev)562 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
563 {
564 	int ret = 0;
565 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
566 
567 	mutex_lock(&data->mutex);
568 	if (!data->ref_cnt) {
569 		ret = hid_hw_open(hsdev->hdev);
570 		if (ret) {
571 			hid_err(hsdev->hdev, "failed to open hid device\n");
572 			mutex_unlock(&data->mutex);
573 			return ret;
574 		}
575 	}
576 	data->ref_cnt++;
577 	mutex_unlock(&data->mutex);
578 
579 	return ret;
580 }
581 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
582 
sensor_hub_device_close(struct hid_sensor_hub_device * hsdev)583 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
584 {
585 	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
586 
587 	mutex_lock(&data->mutex);
588 	data->ref_cnt--;
589 	if (!data->ref_cnt)
590 		hid_hw_close(hsdev->hdev);
591 	mutex_unlock(&data->mutex);
592 }
593 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
594 
sensor_hub_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)595 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
596 		unsigned int *rsize)
597 {
598 	/*
599 	 * Checks if the report descriptor of Thinkpad Helix 2 has a logical
600 	 * minimum for magnetic flux axis greater than the maximum.
601 	 */
602 	if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
603 		*rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
604 		rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
605 		rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
606 		rdesc[921] == 0x07 && rdesc[922] == 0x00) {
607 		/* Sets negative logical minimum for mag x, y and z */
608 		rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
609 		rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
610 		rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
611 		rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
612 	}
613 
614 	return rdesc;
615 }
616 
sensor_hub_probe(struct hid_device * hdev,const struct hid_device_id * id)617 static int sensor_hub_probe(struct hid_device *hdev,
618 				const struct hid_device_id *id)
619 {
620 	int ret;
621 	struct sensor_hub_data *sd;
622 	int i;
623 	char *name;
624 	int dev_cnt;
625 	struct hid_sensor_hub_device *hsdev;
626 	struct hid_sensor_hub_device *last_hsdev = NULL;
627 	struct hid_sensor_hub_device *collection_hsdev = NULL;
628 
629 	sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
630 	if (!sd) {
631 		hid_err(hdev, "cannot allocate Sensor data\n");
632 		return -ENOMEM;
633 	}
634 
635 	hid_set_drvdata(hdev, sd);
636 	sd->quirks = id->driver_data;
637 
638 	spin_lock_init(&sd->lock);
639 	spin_lock_init(&sd->dyn_callback_lock);
640 	mutex_init(&sd->mutex);
641 	ret = hid_parse(hdev);
642 	if (ret) {
643 		hid_err(hdev, "parse failed\n");
644 		return ret;
645 	}
646 	INIT_LIST_HEAD(&hdev->inputs);
647 
648 	ret = hid_hw_start(hdev, 0);
649 	if (ret) {
650 		hid_err(hdev, "hw start failed\n");
651 		return ret;
652 	}
653 	INIT_LIST_HEAD(&sd->dyn_callback_list);
654 	sd->hid_sensor_client_cnt = 0;
655 
656 	dev_cnt = sensor_hub_get_physical_device_count(hdev);
657 	if (dev_cnt > HID_MAX_PHY_DEVICES) {
658 		hid_err(hdev, "Invalid Physical device count\n");
659 		ret = -EINVAL;
660 		goto err_stop_hw;
661 	}
662 	sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
663 						      dev_cnt,
664 						      sizeof(struct mfd_cell),
665 						      GFP_KERNEL);
666 	if (sd->hid_sensor_hub_client_devs == NULL) {
667 		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
668 		ret = -ENOMEM;
669 		goto err_stop_hw;
670 	}
671 
672 	for (i = 0; i < hdev->maxcollection; ++i) {
673 		struct hid_collection *collection = &hdev->collection[i];
674 
675 		if (collection->type == HID_COLLECTION_PHYSICAL ||
676 		    collection->type == HID_COLLECTION_APPLICATION) {
677 
678 			hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
679 					     GFP_KERNEL);
680 			if (!hsdev) {
681 				hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
682 				ret = -ENOMEM;
683 				goto err_stop_hw;
684 			}
685 			hsdev->hdev = hdev;
686 			hsdev->vendor_id = hdev->vendor;
687 			hsdev->product_id = hdev->product;
688 			hsdev->usage = collection->usage;
689 			hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
690 							sizeof(struct mutex),
691 							GFP_KERNEL);
692 			if (!hsdev->mutex_ptr) {
693 				ret = -ENOMEM;
694 				goto err_stop_hw;
695 			}
696 			mutex_init(hsdev->mutex_ptr);
697 			hsdev->start_collection_index = i;
698 			if (last_hsdev)
699 				last_hsdev->end_collection_index = i;
700 			last_hsdev = hsdev;
701 			name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
702 					      "HID-SENSOR-%x",
703 					      collection->usage);
704 			if (name == NULL) {
705 				hid_err(hdev, "Failed MFD device name\n");
706 				ret = -ENOMEM;
707 				goto err_stop_hw;
708 			}
709 			sd->hid_sensor_hub_client_devs[
710 				sd->hid_sensor_client_cnt].name = name;
711 			sd->hid_sensor_hub_client_devs[
712 				sd->hid_sensor_client_cnt].platform_data =
713 							hsdev;
714 			sd->hid_sensor_hub_client_devs[
715 				sd->hid_sensor_client_cnt].pdata_size =
716 							sizeof(*hsdev);
717 			hid_dbg(hdev, "Adding %s:%d\n", name,
718 					hsdev->start_collection_index);
719 			sd->hid_sensor_client_cnt++;
720 			if (collection_hsdev)
721 				collection_hsdev->end_collection_index = i;
722 			if (collection->type == HID_COLLECTION_APPLICATION &&
723 			    collection->usage == HID_USAGE_SENSOR_COLLECTION)
724 				collection_hsdev = hsdev;
725 		}
726 	}
727 	if (last_hsdev)
728 		last_hsdev->end_collection_index = i;
729 	if (collection_hsdev)
730 		collection_hsdev->end_collection_index = i;
731 
732 	ret = mfd_add_hotplug_devices(&hdev->dev,
733 			sd->hid_sensor_hub_client_devs,
734 			sd->hid_sensor_client_cnt);
735 	if (ret < 0)
736 		goto err_stop_hw;
737 
738 	return ret;
739 
740 err_stop_hw:
741 	hid_hw_stop(hdev);
742 
743 	return ret;
744 }
745 
sensor_hub_remove(struct hid_device * hdev)746 static void sensor_hub_remove(struct hid_device *hdev)
747 {
748 	struct sensor_hub_data *data = hid_get_drvdata(hdev);
749 	unsigned long flags;
750 	int i;
751 
752 	hid_dbg(hdev, " hardware removed\n");
753 	hid_hw_close(hdev);
754 	hid_hw_stop(hdev);
755 	spin_lock_irqsave(&data->lock, flags);
756 	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
757 		struct hid_sensor_hub_device *hsdev =
758 			data->hid_sensor_hub_client_devs[i].platform_data;
759 		if (hsdev->pending.status)
760 			complete(&hsdev->pending.ready);
761 	}
762 	spin_unlock_irqrestore(&data->lock, flags);
763 	mfd_remove_devices(&hdev->dev);
764 	hid_set_drvdata(hdev, NULL);
765 	mutex_destroy(&data->mutex);
766 }
767 
768 static const struct hid_device_id sensor_hub_devices[] = {
769 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
770 		     HID_ANY_ID) },
771 	{ }
772 };
773 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
774 
775 static struct hid_driver sensor_hub_driver = {
776 	.name = "hid-sensor-hub",
777 	.id_table = sensor_hub_devices,
778 	.probe = sensor_hub_probe,
779 	.remove = sensor_hub_remove,
780 	.raw_event = sensor_hub_raw_event,
781 	.report_fixup = sensor_hub_report_fixup,
782 #ifdef CONFIG_PM
783 	.suspend = sensor_hub_suspend,
784 	.resume = sensor_hub_resume,
785 	.reset_resume = sensor_hub_reset_resume,
786 #endif
787 };
788 module_hid_driver(sensor_hub_driver);
789 
790 MODULE_DESCRIPTION("HID Sensor Hub driver");
791 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
792 MODULE_LICENSE("GPL");
793