Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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 = buffer_size % sizeof(__s32);
222         buffer_size = buffer_size / sizeof(__s32);
223         if (buffer_size) {
224                 for (i = 0; i < buffer_size; ++i) {
225                         hid_set_field(report->field[field_index], i,
226                                       (__force __s32)cpu_to_le32(*buf32));
227                         ++buf32;
228                 }
229         }
230         if (remaining_bytes) {
231                 value = 0;
232                 memcpy(&value, (u8 *)buf32, remaining_bytes);
233                 hid_set_field(report->field[field_index], i,
234                               (__force __s32)cpu_to_le32(value));
235         }
236         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
237         hid_hw_wait(hsdev->hdev);
238 
239 done_proc:
240         mutex_unlock(&data->mutex);
241 
242         return ret;
243 }
244 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
245 
246 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
247                            u32 field_index, int buffer_size, void *buffer)
248 {
249         struct hid_report *report;
250         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
251         int report_size;
252         int ret = 0;
253 
254         mutex_lock(&data->mutex);
255         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
256         if (!report || (field_index >= report->maxfield) ||
257             report->field[field_index]->report_count < 1) {
258                 ret = -EINVAL;
259                 goto done_proc;
260         }
261         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
262         hid_hw_wait(hsdev->hdev);
263 
264         /* calculate number of bytes required to read this field */
265         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
266                                    8) *
267                                    report->field[field_index]->report_count;
268         if (!report_size) {
269                 ret = -EINVAL;
270                 goto done_proc;
271         }
272         ret = min(report_size, buffer_size);
273         memcpy(buffer, report->field[field_index]->value, ret);
274 
275 done_proc:
276         mutex_unlock(&data->mutex);
277 
278         return ret;
279 }
280 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
281 
282 
283 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
284                                         u32 usage_id,
285                                         u32 attr_usage_id, u32 report_id,
286                                         enum sensor_hub_read_flags flag)
287 {
288         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
289         unsigned long flags;
290         struct hid_report *report;
291         int ret_val = 0;
292 
293         report = sensor_hub_report(report_id, hsdev->hdev,
294                                    HID_INPUT_REPORT);
295         if (!report)
296                 return -EINVAL;
297 
298         mutex_lock(hsdev->mutex_ptr);
299         if (flag == SENSOR_HUB_SYNC) {
300                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
301                 init_completion(&hsdev->pending.ready);
302                 hsdev->pending.usage_id = usage_id;
303                 hsdev->pending.attr_usage_id = attr_usage_id;
304                 hsdev->pending.raw_size = 0;
305 
306                 spin_lock_irqsave(&data->lock, flags);
307                 hsdev->pending.status = true;
308                 spin_unlock_irqrestore(&data->lock, flags);
309         }
310         mutex_lock(&data->mutex);
311         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
312         mutex_unlock(&data->mutex);
313         if (flag == SENSOR_HUB_SYNC) {
314                 wait_for_completion_interruptible_timeout(
315                                                 &hsdev->pending.ready, HZ*5);
316                 switch (hsdev->pending.raw_size) {
317                 case 1:
318                         ret_val = *(u8 *)hsdev->pending.raw_data;
319                         break;
320                 case 2:
321                         ret_val = *(u16 *)hsdev->pending.raw_data;
322                         break;
323                 case 4:
324                         ret_val = *(u32 *)hsdev->pending.raw_data;
325                         break;
326                 default:
327                         ret_val = 0;
328                 }
329                 kfree(hsdev->pending.raw_data);
330                 hsdev->pending.status = false;
331         }
332         mutex_unlock(hsdev->mutex_ptr);
333 
334         return ret_val;
335 }
336 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
337 
338 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
339                                 u32 report_id, int field_index, u32 usage_id)
340 {
341         struct hid_report *report;
342         struct hid_field *field;
343         int i;
344 
345         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
346         if (!report || (field_index >= report->maxfield))
347                 goto done_proc;
348 
349         field = report->field[field_index];
350         for (i = 0; i < field->maxusage; ++i) {
351                 if (field->usage[i].hid == usage_id)
352                         return field->usage[i].usage_index;
353         }
354 
355 done_proc:
356         return -EINVAL;
357 }
358 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
359 
360 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
361                                 u8 type,
362                                 u32 usage_id,
363                                 u32 attr_usage_id,
364                                 struct hid_sensor_hub_attribute_info *info)
365 {
366         int ret = -1;
367         int i;
368         struct hid_report *report;
369         struct hid_field *field;
370         struct hid_report_enum *report_enum;
371         struct hid_device *hdev = hsdev->hdev;
372 
373         /* Initialize with defaults */
374         info->usage_id = usage_id;
375         info->attrib_id = attr_usage_id;
376         info->report_id = -1;
377         info->index = -1;
378         info->units = -1;
379         info->unit_expo = -1;
380 
381         report_enum = &hdev->report_enum[type];
382         list_for_each_entry(report, &report_enum->report_list, list) {
383                 for (i = 0; i < report->maxfield; ++i) {
384                         field = report->field[i];
385                         if (field->maxusage) {
386                                 if (field->physical == usage_id &&
387                                         (field->logical == attr_usage_id ||
388                                         field->usage[0].hid ==
389                                                         attr_usage_id) &&
390                                         (field->usage[0].collection_index >=
391                                         hsdev->start_collection_index) &&
392                                         (field->usage[0].collection_index <
393                                         hsdev->end_collection_index)) {
394 
395                                         sensor_hub_fill_attr_info(info, i,
396                                                                 report->id,
397                                                                 field);
398                                         ret = 0;
399                                         break;
400                                 }
401                         }
402                 }
403 
404         }
405 
406         return ret;
407 }
408 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
409 
410 #ifdef CONFIG_PM
411 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
412 {
413         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
414         struct hid_sensor_hub_callbacks_list *callback;
415         unsigned long flags;
416 
417         hid_dbg(hdev, " sensor_hub_suspend\n");
418         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
419         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
420                 if (callback->usage_callback->suspend)
421                         callback->usage_callback->suspend(
422                                         callback->hsdev, callback->priv);
423         }
424         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
425 
426         return 0;
427 }
428 
429 static int sensor_hub_resume(struct hid_device *hdev)
430 {
431         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
432         struct hid_sensor_hub_callbacks_list *callback;
433         unsigned long flags;
434 
435         hid_dbg(hdev, " sensor_hub_resume\n");
436         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
437         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
438                 if (callback->usage_callback->resume)
439                         callback->usage_callback->resume(
440                                         callback->hsdev, callback->priv);
441         }
442         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
443 
444         return 0;
445 }
446 
447 static int sensor_hub_reset_resume(struct hid_device *hdev)
448 {
449         return 0;
450 }
451 #endif
452 
453 /*
454  * Handle raw report as sent by device
455  */
456 static int sensor_hub_raw_event(struct hid_device *hdev,
457                 struct hid_report *report, u8 *raw_data, int size)
458 {
459         int i;
460         u8 *ptr;
461         int sz;
462         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
463         unsigned long flags;
464         struct hid_sensor_hub_callbacks *callback = NULL;
465         struct hid_collection *collection = NULL;
466         void *priv = NULL;
467         struct hid_sensor_hub_device *hsdev = NULL;
468 
469         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
470                          report->id, size, report->type);
471         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
472         if (report->type != HID_INPUT_REPORT)
473                 return 1;
474 
475         ptr = raw_data;
476         ptr++; /* Skip report id */
477 
478         spin_lock_irqsave(&pdata->lock, flags);
479 
480         for (i = 0; i < report->maxfield; ++i) {
481                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
482                                 i, report->field[i]->usage->collection_index,
483                                 report->field[i]->usage->hid,
484                                 (report->field[i]->report_size *
485                                         report->field[i]->report_count)/8);
486                 sz = (report->field[i]->report_size *
487                                         report->field[i]->report_count)/8;
488                 collection = &hdev->collection[
489                                 report->field[i]->usage->collection_index];
490                 hid_dbg(hdev, "collection->usage %x\n",
491                                         collection->usage);
492 
493                 callback = sensor_hub_get_callback(hdev,
494                                 report->field[i]->physical,
495                                 report->field[i]->usage[0].collection_index,
496                                 &hsdev, &priv);
497                 if (!callback) {
498                         ptr += sz;
499                         continue;
500                 }
501                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
502                                               report->field[i]->usage->hid ||
503                                               hsdev->pending.attr_usage_id ==
504                                               report->field[i]->logical)) {
505                         hid_dbg(hdev, "data was pending ...\n");
506                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
507                         if (hsdev->pending.raw_data)
508                                 hsdev->pending.raw_size = sz;
509                         else
510                                 hsdev->pending.raw_size = 0;
511                         complete(&hsdev->pending.ready);
512                 }
513                 if (callback->capture_sample) {
514                         if (report->field[i]->logical)
515                                 callback->capture_sample(hsdev,
516                                         report->field[i]->logical, sz, ptr,
517                                         callback->pdev);
518                         else
519                                 callback->capture_sample(hsdev,
520                                         report->field[i]->usage->hid, sz, ptr,
521                                         callback->pdev);
522                 }
523                 ptr += sz;
524         }
525         if (callback && collection && callback->send_event)
526                 callback->send_event(hsdev, collection->usage,
527                                 callback->pdev);
528         spin_unlock_irqrestore(&pdata->lock, flags);
529 
530         return 1;
531 }
532 
533 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
534 {
535         int ret = 0;
536         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
537 
538         mutex_lock(&data->mutex);
539         if (!data->ref_cnt) {
540                 ret = hid_hw_open(hsdev->hdev);
541                 if (ret) {
542                         hid_err(hsdev->hdev, "failed to open hid device\n");
543                         mutex_unlock(&data->mutex);
544                         return ret;
545                 }
546         }
547         data->ref_cnt++;
548         mutex_unlock(&data->mutex);
549 
550         return ret;
551 }
552 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
553 
554 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
555 {
556         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
557 
558         mutex_lock(&data->mutex);
559         data->ref_cnt--;
560         if (!data->ref_cnt)
561                 hid_hw_close(hsdev->hdev);
562         mutex_unlock(&data->mutex);
563 }
564 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
565 
566 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
567                 unsigned int *rsize)
568 {
569         int index;
570         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
571         unsigned char report_block[] = {
572                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
573         unsigned char power_block[] = {
574                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
575 
576         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
577                 hid_dbg(hdev, "No Enum quirks\n");
578                 return rdesc;
579         }
580 
581         /* Looks for power and report state usage id and force to 1 */
582         for (index = 0; index < *rsize; ++index) {
583                 if (((*rsize - index) > sizeof(report_block)) &&
584                         !memcmp(&rdesc[index], report_block,
585                                                 sizeof(report_block))) {
586                         rdesc[index + 4] = 0x01;
587                         index += sizeof(report_block);
588                 }
589                 if (((*rsize - index) > sizeof(power_block)) &&
590                         !memcmp(&rdesc[index], power_block,
591                                                 sizeof(power_block))) {
592                         rdesc[index + 4] = 0x01;
593                         index += sizeof(power_block);
594                 }
595         }
596 
597         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
598          * minimum for magnetic flux axis greater than the maximum */
599         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
600                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
601                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
602                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
603                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
604                 /* Sets negative logical minimum for mag x, y and z */
605                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
606                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
607                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
608                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
609         }
610 
611         return rdesc;
612 }
613 
614 static int sensor_hub_probe(struct hid_device *hdev,
615                                 const struct hid_device_id *id)
616 {
617         int ret;
618         struct sensor_hub_data *sd;
619         int i;
620         char *name;
621         int dev_cnt;
622         struct hid_sensor_hub_device *hsdev;
623         struct hid_sensor_hub_device *last_hsdev = NULL;
624         struct hid_sensor_hub_device *collection_hsdev = NULL;
625 
626         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
627         if (!sd) {
628                 hid_err(hdev, "cannot allocate Sensor data\n");
629                 return -ENOMEM;
630         }
631 
632         hid_set_drvdata(hdev, sd);
633         sd->quirks = id->driver_data;
634 
635         spin_lock_init(&sd->lock);
636         spin_lock_init(&sd->dyn_callback_lock);
637         mutex_init(&sd->mutex);
638         ret = hid_parse(hdev);
639         if (ret) {
640                 hid_err(hdev, "parse failed\n");
641                 return ret;
642         }
643         INIT_LIST_HEAD(&hdev->inputs);
644 
645         ret = hid_hw_start(hdev, 0);
646         if (ret) {
647                 hid_err(hdev, "hw start failed\n");
648                 return ret;
649         }
650         INIT_LIST_HEAD(&sd->dyn_callback_list);
651         sd->hid_sensor_client_cnt = 0;
652 
653         dev_cnt = sensor_hub_get_physical_device_count(hdev);
654         if (dev_cnt > HID_MAX_PHY_DEVICES) {
655                 hid_err(hdev, "Invalid Physical device count\n");
656                 ret = -EINVAL;
657                 goto err_stop_hw;
658         }
659         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
660                                                       sizeof(struct mfd_cell),
661                                                       GFP_KERNEL);
662         if (sd->hid_sensor_hub_client_devs == NULL) {
663                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
664                 ret = -ENOMEM;
665                 goto err_stop_hw;
666         }
667 
668         for (i = 0; i < hdev->maxcollection; ++i) {
669                 struct hid_collection *collection = &hdev->collection[i];
670 
671                 if (collection->type == HID_COLLECTION_PHYSICAL ||
672                     collection->type == HID_COLLECTION_APPLICATION) {
673 
674                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
675                                              GFP_KERNEL);
676                         if (!hsdev) {
677                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
678                                 ret = -ENOMEM;
679                                 goto err_stop_hw;
680                         }
681                         hsdev->hdev = hdev;
682                         hsdev->vendor_id = hdev->vendor;
683                         hsdev->product_id = hdev->product;
684                         hsdev->usage = collection->usage;
685                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
686                                                         sizeof(struct mutex),
687                                                         GFP_KERNEL);
688                         if (!hsdev->mutex_ptr) {
689                                 ret = -ENOMEM;
690                                 goto err_stop_hw;
691                         }
692                         mutex_init(hsdev->mutex_ptr);
693                         hsdev->start_collection_index = i;
694                         if (last_hsdev)
695                                 last_hsdev->end_collection_index = i;
696                         last_hsdev = hsdev;
697                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
698                                               "HID-SENSOR-%x",
699                                               collection->usage);
700                         if (name == NULL) {
701                                 hid_err(hdev, "Failed MFD device name\n");
702                                 ret = -ENOMEM;
703                                 goto err_stop_hw;
704                         }
705                         sd->hid_sensor_hub_client_devs[
706                                 sd->hid_sensor_client_cnt].name = name;
707                         sd->hid_sensor_hub_client_devs[
708                                 sd->hid_sensor_client_cnt].platform_data =
709                                                         hsdev;
710                         sd->hid_sensor_hub_client_devs[
711                                 sd->hid_sensor_client_cnt].pdata_size =
712                                                         sizeof(*hsdev);
713                         hid_dbg(hdev, "Adding %s:%d\n", name,
714                                         hsdev->start_collection_index);
715                         sd->hid_sensor_client_cnt++;
716                         if (collection_hsdev)
717                                 collection_hsdev->end_collection_index = i;
718                         if (collection->type == HID_COLLECTION_APPLICATION &&
719                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
720                                 collection_hsdev = hsdev;
721                 }
722         }
723         if (last_hsdev)
724                 last_hsdev->end_collection_index = i;
725         if (collection_hsdev)
726                 collection_hsdev->end_collection_index = i;
727 
728         ret = mfd_add_hotplug_devices(&hdev->dev,
729                         sd->hid_sensor_hub_client_devs,
730                         sd->hid_sensor_client_cnt);
731         if (ret < 0)
732                 goto err_stop_hw;
733 
734         return ret;
735 
736 err_stop_hw:
737         hid_hw_stop(hdev);
738 
739         return ret;
740 }
741 
742 static void sensor_hub_remove(struct hid_device *hdev)
743 {
744         struct sensor_hub_data *data = hid_get_drvdata(hdev);
745         unsigned long flags;
746         int i;
747 
748         hid_dbg(hdev, " hardware removed\n");
749         hid_hw_close(hdev);
750         hid_hw_stop(hdev);
751         spin_lock_irqsave(&data->lock, flags);
752         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
753                 struct hid_sensor_hub_device *hsdev =
754                         data->hid_sensor_hub_client_devs[i].platform_data;
755                 if (hsdev->pending.status)
756                         complete(&hsdev->pending.ready);
757         }
758         spin_unlock_irqrestore(&data->lock, flags);
759         mfd_remove_devices(&hdev->dev);
760         hid_set_drvdata(hdev, NULL);
761         mutex_destroy(&data->mutex);
762 }
763 
764 static const struct hid_device_id sensor_hub_devices[] = {
765         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
766                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
767                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
768         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
769                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
770                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
771         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
772                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
773                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
774         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
775                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
776                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
777         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
778                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
779                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
780         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
781                         USB_DEVICE_ID_MS_TYPE_COVER_2),
782                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
783         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
784                         USB_DEVICE_ID_STM_HID_SENSOR),
785                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
786         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
787                         USB_DEVICE_ID_STM_HID_SENSOR_1),
788                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
789         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
790                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
791                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
792         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
793                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
794                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
795         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
796                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
797                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
798         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
799                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
800                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
801         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
802                      HID_ANY_ID) },
803         { }
804 };
805 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
806 
807 static struct hid_driver sensor_hub_driver = {
808         .name = "hid-sensor-hub",
809         .id_table = sensor_hub_devices,
810         .probe = sensor_hub_probe,
811         .remove = sensor_hub_remove,
812         .raw_event = sensor_hub_raw_event,
813         .report_fixup = sensor_hub_report_fixup,
814 #ifdef CONFIG_PM
815         .suspend = sensor_hub_suspend,
816         .resume = sensor_hub_resume,
817         .reset_resume = sensor_hub_reset_resume,
818 #endif
819 };
820 module_hid_driver(sensor_hub_driver);
821 
822 MODULE_DESCRIPTION("HID Sensor Hub driver");
823 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
824 MODULE_LICENSE("GPL");
825 

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