Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/hid/hid-sensor-hub.c

  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 #include <linux/device.h>
 20 #include <linux/hid.h>
 21 #include <linux/module.h>
 22 #include <linux/slab.h>
 23 #include <linux/mfd/core.h>
 24 #include <linux/list.h>
 25 #include <linux/hid-sensor-ids.h>
 26 #include <linux/hid-sensor-hub.h>
 27 #include "hid-ids.h"
 28 
 29 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
 30 
 31 /**
 32  * struct sensor_hub_data - Hold a instance data for a HID hub device
 33  * @hsdev:              Stored hid instance for current hub device.
 34  * @mutex:              Mutex to serialize synchronous request.
 35  * @lock:               Spin lock to protect pending request structure.
 36  * @dyn_callback_list:  Holds callback function
 37  * @dyn_callback_lock:  spin lock to protect callback list
 38  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
 39  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
 40  * @ref_cnt:            Number of MFD clients have opened this device
 41  */
 42 struct sensor_hub_data {
 43         struct mutex mutex;
 44         spinlock_t lock;
 45         struct list_head dyn_callback_list;
 46         spinlock_t dyn_callback_lock;
 47         struct mfd_cell *hid_sensor_hub_client_devs;
 48         int hid_sensor_client_cnt;
 49         unsigned long quirks;
 50         int ref_cnt;
 51 };
 52 
 53 /**
 54  * struct hid_sensor_hub_callbacks_list - Stores callback list
 55  * @list:               list head.
 56  * @usage_id:           usage id for a physical device.
 57  * @usage_callback:     Stores registered callback functions.
 58  * @priv:               Private data for a physical device.
 59  */
 60 struct hid_sensor_hub_callbacks_list {
 61         struct list_head list;
 62         u32 usage_id;
 63         struct hid_sensor_hub_device *hsdev;
 64         struct hid_sensor_hub_callbacks *usage_callback;
 65         void *priv;
 66 };
 67 
 68 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
 69                                                 int dir)
 70 {
 71         struct hid_report *report;
 72 
 73         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
 74                 if (report->id == id)
 75                         return report;
 76         }
 77         hid_warn(hdev, "No report with id 0x%x found\n", id);
 78 
 79         return NULL;
 80 }
 81 
 82 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
 83 {
 84         int i;
 85         int count = 0;
 86 
 87         for (i = 0; i < hdev->maxcollection; ++i) {
 88                 struct hid_collection *collection = &hdev->collection[i];
 89                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 90                     collection->type == HID_COLLECTION_APPLICATION)
 91                         ++count;
 92         }
 93 
 94         return count;
 95 }
 96 
 97 static void sensor_hub_fill_attr_info(
 98                 struct hid_sensor_hub_attribute_info *info,
 99                 s32 index, s32 report_id, struct hid_field *field)
100 {
101         info->index = index;
102         info->report_id = report_id;
103         info->units = field->unit;
104         info->unit_expo = field->unit_exponent;
105         info->size = (field->report_size * field->report_count)/8;
106         info->logical_minimum = field->logical_minimum;
107         info->logical_maximum = field->logical_maximum;
108 }
109 
110 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
111                                         struct hid_device *hdev,
112                                         u32 usage_id,
113                                         int collection_index,
114                                         struct hid_sensor_hub_device **hsdev,
115                                         void **priv)
116 {
117         struct hid_sensor_hub_callbacks_list *callback;
118         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
119         unsigned long flags;
120 
121         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
122         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
123                 if ((callback->usage_id == usage_id ||
124                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
125                         (collection_index >=
126                                 callback->hsdev->start_collection_index) &&
127                         (collection_index <
128                                 callback->hsdev->end_collection_index)) {
129                         *priv = callback->priv;
130                         *hsdev = callback->hsdev;
131                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
132                                                flags);
133                         return callback->usage_callback;
134                 }
135         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
136 
137         return NULL;
138 }
139 
140 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
141                         u32 usage_id,
142                         struct hid_sensor_hub_callbacks *usage_callback)
143 {
144         struct hid_sensor_hub_callbacks_list *callback;
145         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
146         unsigned long flags;
147 
148         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
149         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
150                 if (callback->usage_id == usage_id &&
151                                                 callback->hsdev == hsdev) {
152                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
153                         return -EINVAL;
154                 }
155         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
156         if (!callback) {
157                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
158                 return -ENOMEM;
159         }
160         callback->hsdev = hsdev;
161         callback->usage_callback = usage_callback;
162         callback->usage_id = usage_id;
163         callback->priv = NULL;
164         /*
165          * If there is a handler registered for the collection type, then
166          * it will handle all reports for sensors in this collection. If
167          * there is also an individual sensor handler registration, then
168          * we want to make sure that the reports are directed to collection
169          * handler, as this may be a fusion sensor. So add collection handlers
170          * to the beginning of the list, so that they are matched first.
171          */
172         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
173                 list_add(&callback->list, &pdata->dyn_callback_list);
174         else
175                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
176         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
177 
178         return 0;
179 }
180 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
181 
182 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
183                                 u32 usage_id)
184 {
185         struct hid_sensor_hub_callbacks_list *callback;
186         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
187         unsigned long flags;
188 
189         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
190         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
191                 if (callback->usage_id == usage_id &&
192                                                 callback->hsdev == hsdev) {
193                         list_del(&callback->list);
194                         kfree(callback);
195                         break;
196                 }
197         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
198 
199         return 0;
200 }
201 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
202 
203 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
204                            u32 field_index, int buffer_size, void *buffer)
205 {
206         struct hid_report *report;
207         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
208         __s32 *buf32 = buffer;
209         int i = 0;
210         int remaining_bytes;
211         __s32 value;
212         int ret = 0;
213 
214         mutex_lock(&data->mutex);
215         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
216         if (!report || (field_index >= report->maxfield)) {
217                 ret = -EINVAL;
218                 goto done_proc;
219         }
220 
221         remaining_bytes = do_div(buffer_size, sizeof(__s32));
222         if (buffer_size) {
223                 for (i = 0; i < buffer_size; ++i) {
224                         hid_set_field(report->field[field_index], i,
225                                       (__force __s32)cpu_to_le32(*buf32));
226                         ++buf32;
227                 }
228         }
229         if (remaining_bytes) {
230                 value = 0;
231                 memcpy(&value, (u8 *)buf32, remaining_bytes);
232                 hid_set_field(report->field[field_index], i,
233                               (__force __s32)cpu_to_le32(value));
234         }
235         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
236         hid_hw_wait(hsdev->hdev);
237 
238 done_proc:
239         mutex_unlock(&data->mutex);
240 
241         return ret;
242 }
243 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
244 
245 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
246                            u32 field_index, int buffer_size, void *buffer)
247 {
248         struct hid_report *report;
249         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
250         int report_size;
251         int ret = 0;
252 
253         mutex_lock(&data->mutex);
254         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
255         if (!report || (field_index >= report->maxfield) ||
256             report->field[field_index]->report_count < 1) {
257                 ret = -EINVAL;
258                 goto done_proc;
259         }
260         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
261         hid_hw_wait(hsdev->hdev);
262 
263         /* calculate number of bytes required to read this field */
264         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
265                                    8) *
266                                    report->field[field_index]->report_count;
267         if (!report_size) {
268                 ret = -EINVAL;
269                 goto done_proc;
270         }
271         ret = min(report_size, buffer_size);
272         memcpy(buffer, report->field[field_index]->value, ret);
273 
274 done_proc:
275         mutex_unlock(&data->mutex);
276 
277         return ret;
278 }
279 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
280 
281 
282 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
283                                         u32 usage_id,
284                                         u32 attr_usage_id, u32 report_id,
285                                         enum sensor_hub_read_flags flag)
286 {
287         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
288         unsigned long flags;
289         struct hid_report *report;
290         int ret_val = 0;
291 
292         report = sensor_hub_report(report_id, hsdev->hdev,
293                                    HID_INPUT_REPORT);
294         if (!report)
295                 return -EINVAL;
296 
297         mutex_lock(hsdev->mutex_ptr);
298         if (flag == SENSOR_HUB_SYNC) {
299                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
300                 init_completion(&hsdev->pending.ready);
301                 hsdev->pending.usage_id = usage_id;
302                 hsdev->pending.attr_usage_id = attr_usage_id;
303                 hsdev->pending.raw_size = 0;
304 
305                 spin_lock_irqsave(&data->lock, flags);
306                 hsdev->pending.status = true;
307                 spin_unlock_irqrestore(&data->lock, flags);
308         }
309         mutex_lock(&data->mutex);
310         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
311         mutex_unlock(&data->mutex);
312         if (flag == SENSOR_HUB_SYNC) {
313                 wait_for_completion_interruptible_timeout(
314                                                 &hsdev->pending.ready, HZ*5);
315                 switch (hsdev->pending.raw_size) {
316                 case 1:
317                         ret_val = *(u8 *)hsdev->pending.raw_data;
318                         break;
319                 case 2:
320                         ret_val = *(u16 *)hsdev->pending.raw_data;
321                         break;
322                 case 4:
323                         ret_val = *(u32 *)hsdev->pending.raw_data;
324                         break;
325                 default:
326                         ret_val = 0;
327                 }
328                 kfree(hsdev->pending.raw_data);
329                 hsdev->pending.status = false;
330         }
331         mutex_unlock(hsdev->mutex_ptr);
332 
333         return ret_val;
334 }
335 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
336 
337 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
338                                 u32 report_id, int field_index, u32 usage_id)
339 {
340         struct hid_report *report;
341         struct hid_field *field;
342         int i;
343 
344         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
345         if (!report || (field_index >= report->maxfield))
346                 goto done_proc;
347 
348         field = report->field[field_index];
349         for (i = 0; i < field->maxusage; ++i) {
350                 if (field->usage[i].hid == usage_id)
351                         return field->usage[i].usage_index;
352         }
353 
354 done_proc:
355         return -EINVAL;
356 }
357 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
358 
359 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
360                                 u8 type,
361                                 u32 usage_id,
362                                 u32 attr_usage_id,
363                                 struct hid_sensor_hub_attribute_info *info)
364 {
365         int ret = -1;
366         int i;
367         struct hid_report *report;
368         struct hid_field *field;
369         struct hid_report_enum *report_enum;
370         struct hid_device *hdev = hsdev->hdev;
371 
372         /* Initialize with defaults */
373         info->usage_id = usage_id;
374         info->attrib_id = attr_usage_id;
375         info->report_id = -1;
376         info->index = -1;
377         info->units = -1;
378         info->unit_expo = -1;
379 
380         report_enum = &hdev->report_enum[type];
381         list_for_each_entry(report, &report_enum->report_list, list) {
382                 for (i = 0; i < report->maxfield; ++i) {
383                         field = report->field[i];
384                         if (field->maxusage) {
385                                 if (field->physical == usage_id &&
386                                         (field->logical == attr_usage_id ||
387                                         field->usage[0].hid ==
388                                                         attr_usage_id) &&
389                                         (field->usage[0].collection_index >=
390                                         hsdev->start_collection_index) &&
391                                         (field->usage[0].collection_index <
392                                         hsdev->end_collection_index)) {
393 
394                                         sensor_hub_fill_attr_info(info, i,
395                                                                 report->id,
396                                                                 field);
397                                         ret = 0;
398                                         break;
399                                 }
400                         }
401                 }
402 
403         }
404 
405         return ret;
406 }
407 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
408 
409 #ifdef CONFIG_PM
410 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
411 {
412         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
413         struct hid_sensor_hub_callbacks_list *callback;
414         unsigned long flags;
415 
416         hid_dbg(hdev, " sensor_hub_suspend\n");
417         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
418         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
419                 if (callback->usage_callback->suspend)
420                         callback->usage_callback->suspend(
421                                         callback->hsdev, callback->priv);
422         }
423         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
424 
425         return 0;
426 }
427 
428 static int sensor_hub_resume(struct hid_device *hdev)
429 {
430         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
431         struct hid_sensor_hub_callbacks_list *callback;
432         unsigned long flags;
433 
434         hid_dbg(hdev, " sensor_hub_resume\n");
435         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
436         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
437                 if (callback->usage_callback->resume)
438                         callback->usage_callback->resume(
439                                         callback->hsdev, callback->priv);
440         }
441         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
442 
443         return 0;
444 }
445 
446 static int sensor_hub_reset_resume(struct hid_device *hdev)
447 {
448         return 0;
449 }
450 #endif
451 
452 /*
453  * Handle raw report as sent by device
454  */
455 static int sensor_hub_raw_event(struct hid_device *hdev,
456                 struct hid_report *report, u8 *raw_data, int size)
457 {
458         int i;
459         u8 *ptr;
460         int sz;
461         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
462         unsigned long flags;
463         struct hid_sensor_hub_callbacks *callback = NULL;
464         struct hid_collection *collection = NULL;
465         void *priv = NULL;
466         struct hid_sensor_hub_device *hsdev = NULL;
467 
468         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
469                          report->id, size, report->type);
470         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
471         if (report->type != HID_INPUT_REPORT)
472                 return 1;
473 
474         ptr = raw_data;
475         ptr++; /* Skip report id */
476 
477         spin_lock_irqsave(&pdata->lock, flags);
478 
479         for (i = 0; i < report->maxfield; ++i) {
480                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
481                                 i, report->field[i]->usage->collection_index,
482                                 report->field[i]->usage->hid,
483                                 (report->field[i]->report_size *
484                                         report->field[i]->report_count)/8);
485                 sz = (report->field[i]->report_size *
486                                         report->field[i]->report_count)/8;
487                 collection = &hdev->collection[
488                                 report->field[i]->usage->collection_index];
489                 hid_dbg(hdev, "collection->usage %x\n",
490                                         collection->usage);
491 
492                 callback = sensor_hub_get_callback(hdev,
493                                 report->field[i]->physical,
494                                 report->field[i]->usage[0].collection_index,
495                                 &hsdev, &priv);
496                 if (!callback) {
497                         ptr += sz;
498                         continue;
499                 }
500                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
501                                               report->field[i]->usage->hid ||
502                                               hsdev->pending.attr_usage_id ==
503                                               report->field[i]->logical)) {
504                         hid_dbg(hdev, "data was pending ...\n");
505                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
506                         if (hsdev->pending.raw_data)
507                                 hsdev->pending.raw_size = sz;
508                         else
509                                 hsdev->pending.raw_size = 0;
510                         complete(&hsdev->pending.ready);
511                 }
512                 if (callback->capture_sample) {
513                         if (report->field[i]->logical)
514                                 callback->capture_sample(hsdev,
515                                         report->field[i]->logical, sz, ptr,
516                                         callback->pdev);
517                         else
518                                 callback->capture_sample(hsdev,
519                                         report->field[i]->usage->hid, sz, ptr,
520                                         callback->pdev);
521                 }
522                 ptr += sz;
523         }
524         if (callback && collection && callback->send_event)
525                 callback->send_event(hsdev, collection->usage,
526                                 callback->pdev);
527         spin_unlock_irqrestore(&pdata->lock, flags);
528 
529         return 1;
530 }
531 
532 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
533 {
534         int ret = 0;
535         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
536 
537         mutex_lock(&data->mutex);
538         if (!data->ref_cnt) {
539                 ret = hid_hw_open(hsdev->hdev);
540                 if (ret) {
541                         hid_err(hsdev->hdev, "failed to open hid device\n");
542                         mutex_unlock(&data->mutex);
543                         return ret;
544                 }
545         }
546         data->ref_cnt++;
547         mutex_unlock(&data->mutex);
548 
549         return ret;
550 }
551 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
552 
553 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
554 {
555         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
556 
557         mutex_lock(&data->mutex);
558         data->ref_cnt--;
559         if (!data->ref_cnt)
560                 hid_hw_close(hsdev->hdev);
561         mutex_unlock(&data->mutex);
562 }
563 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
564 
565 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
566                 unsigned int *rsize)
567 {
568         int index;
569         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
570         unsigned char report_block[] = {
571                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
572         unsigned char power_block[] = {
573                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
574 
575         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
576                 hid_dbg(hdev, "No Enum quirks\n");
577                 return rdesc;
578         }
579 
580         /* Looks for power and report state usage id and force to 1 */
581         for (index = 0; index < *rsize; ++index) {
582                 if (((*rsize - index) > sizeof(report_block)) &&
583                         !memcmp(&rdesc[index], report_block,
584                                                 sizeof(report_block))) {
585                         rdesc[index + 4] = 0x01;
586                         index += sizeof(report_block);
587                 }
588                 if (((*rsize - index) > sizeof(power_block)) &&
589                         !memcmp(&rdesc[index], power_block,
590                                                 sizeof(power_block))) {
591                         rdesc[index + 4] = 0x01;
592                         index += sizeof(power_block);
593                 }
594         }
595 
596         return rdesc;
597 }
598 
599 static int sensor_hub_probe(struct hid_device *hdev,
600                                 const struct hid_device_id *id)
601 {
602         int ret;
603         struct sensor_hub_data *sd;
604         int i;
605         char *name;
606         int dev_cnt;
607         struct hid_sensor_hub_device *hsdev;
608         struct hid_sensor_hub_device *last_hsdev = NULL;
609         struct hid_sensor_hub_device *collection_hsdev = NULL;
610 
611         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
612         if (!sd) {
613                 hid_err(hdev, "cannot allocate Sensor data\n");
614                 return -ENOMEM;
615         }
616 
617         hid_set_drvdata(hdev, sd);
618         sd->quirks = id->driver_data;
619 
620         spin_lock_init(&sd->lock);
621         spin_lock_init(&sd->dyn_callback_lock);
622         mutex_init(&sd->mutex);
623         ret = hid_parse(hdev);
624         if (ret) {
625                 hid_err(hdev, "parse failed\n");
626                 return ret;
627         }
628         INIT_LIST_HEAD(&hdev->inputs);
629 
630         ret = hid_hw_start(hdev, 0);
631         if (ret) {
632                 hid_err(hdev, "hw start failed\n");
633                 return ret;
634         }
635         INIT_LIST_HEAD(&sd->dyn_callback_list);
636         sd->hid_sensor_client_cnt = 0;
637 
638         dev_cnt = sensor_hub_get_physical_device_count(hdev);
639         if (dev_cnt > HID_MAX_PHY_DEVICES) {
640                 hid_err(hdev, "Invalid Physical device count\n");
641                 ret = -EINVAL;
642                 goto err_stop_hw;
643         }
644         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
645                                                       sizeof(struct mfd_cell),
646                                                       GFP_KERNEL);
647         if (sd->hid_sensor_hub_client_devs == NULL) {
648                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
649                         ret = -ENOMEM;
650                         goto err_stop_hw;
651         }
652 
653         for (i = 0; i < hdev->maxcollection; ++i) {
654                 struct hid_collection *collection = &hdev->collection[i];
655 
656                 if (collection->type == HID_COLLECTION_PHYSICAL ||
657                     collection->type == HID_COLLECTION_APPLICATION) {
658 
659                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
660                                              GFP_KERNEL);
661                         if (!hsdev) {
662                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
663                                 ret = -ENOMEM;
664                                 goto err_stop_hw;
665                         }
666                         hsdev->hdev = hdev;
667                         hsdev->vendor_id = hdev->vendor;
668                         hsdev->product_id = hdev->product;
669                         hsdev->usage = collection->usage;
670                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
671                                                         sizeof(struct mutex),
672                                                         GFP_KERNEL);
673                         if (!hsdev->mutex_ptr) {
674                                 ret = -ENOMEM;
675                                 goto err_stop_hw;
676                         }
677                         mutex_init(hsdev->mutex_ptr);
678                         hsdev->start_collection_index = i;
679                         if (last_hsdev)
680                                 last_hsdev->end_collection_index = i;
681                         last_hsdev = hsdev;
682                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
683                                               "HID-SENSOR-%x",
684                                               collection->usage);
685                         if (name == NULL) {
686                                 hid_err(hdev, "Failed MFD device name\n");
687                                         ret = -ENOMEM;
688                                         goto err_stop_hw;
689                         }
690                         sd->hid_sensor_hub_client_devs[
691                                 sd->hid_sensor_client_cnt].name = name;
692                         sd->hid_sensor_hub_client_devs[
693                                 sd->hid_sensor_client_cnt].platform_data =
694                                                         hsdev;
695                         sd->hid_sensor_hub_client_devs[
696                                 sd->hid_sensor_client_cnt].pdata_size =
697                                                         sizeof(*hsdev);
698                         hid_dbg(hdev, "Adding %s:%d\n", name,
699                                         hsdev->start_collection_index);
700                         sd->hid_sensor_client_cnt++;
701                         if (collection_hsdev)
702                                 collection_hsdev->end_collection_index = i;
703                         if (collection->type == HID_COLLECTION_APPLICATION &&
704                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
705                                 collection_hsdev = hsdev;
706                 }
707         }
708         if (last_hsdev)
709                 last_hsdev->end_collection_index = i;
710         if (collection_hsdev)
711                 collection_hsdev->end_collection_index = i;
712 
713         ret = mfd_add_hotplug_devices(&hdev->dev,
714                         sd->hid_sensor_hub_client_devs,
715                         sd->hid_sensor_client_cnt);
716         if (ret < 0)
717                 goto err_stop_hw;
718 
719         return ret;
720 
721 err_stop_hw:
722         hid_hw_stop(hdev);
723 
724         return ret;
725 }
726 
727 static void sensor_hub_remove(struct hid_device *hdev)
728 {
729         struct sensor_hub_data *data = hid_get_drvdata(hdev);
730         unsigned long flags;
731         int i;
732 
733         hid_dbg(hdev, " hardware removed\n");
734         hid_hw_close(hdev);
735         hid_hw_stop(hdev);
736         spin_lock_irqsave(&data->lock, flags);
737         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
738                 struct hid_sensor_hub_device *hsdev =
739                         data->hid_sensor_hub_client_devs[i].platform_data;
740                 if (hsdev->pending.status)
741                         complete(&hsdev->pending.ready);
742         }
743         spin_unlock_irqrestore(&data->lock, flags);
744         mfd_remove_devices(&hdev->dev);
745         hid_set_drvdata(hdev, NULL);
746         mutex_destroy(&data->mutex);
747 }
748 
749 static const struct hid_device_id sensor_hub_devices[] = {
750         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
751                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
752                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
753         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
754                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
755                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
756         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
757                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
758                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
759         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
760                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
761                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
762         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
763                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
764                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
765         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
766                         USB_DEVICE_ID_MS_TYPE_COVER_2),
767                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
768         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
769                         USB_DEVICE_ID_STM_HID_SENSOR),
770                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
771         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
772                         USB_DEVICE_ID_STM_HID_SENSOR_1),
773                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
774         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
775                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
776                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
777         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
778                      HID_ANY_ID) },
779         { }
780 };
781 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
782 
783 static struct hid_driver sensor_hub_driver = {
784         .name = "hid-sensor-hub",
785         .id_table = sensor_hub_devices,
786         .probe = sensor_hub_probe,
787         .remove = sensor_hub_remove,
788         .raw_event = sensor_hub_raw_event,
789         .report_fixup = sensor_hub_report_fixup,
790 #ifdef CONFIG_PM
791         .suspend = sensor_hub_suspend,
792         .resume = sensor_hub_resume,
793         .reset_resume = sensor_hub_reset_resume,
794 #endif
795 };
796 module_hid_driver(sensor_hub_driver);
797 
798 MODULE_DESCRIPTION("HID Sensor Hub driver");
799 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
800 MODULE_LICENSE("GPL");
801 

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