Merge tag 'for-6.6-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[platform/kernel/linux-rpi.git] / drivers / hid / hid-sensor-hub.c
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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  */
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
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
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
583 static __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
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);
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
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");