Version:  2.0.40 2.2.26 2.4.37 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 4.9

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 
 20 #include <linux/device.h>
 21 #include <linux/hid.h>
 22 #include <linux/module.h>
 23 #include <linux/slab.h>
 24 #include <linux/mfd/core.h>
 25 #include <linux/list.h>
 26 #include <linux/hid-sensor-ids.h>
 27 #include <linux/hid-sensor-hub.h>
 28 #include "hid-ids.h"
 29 
 30 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
 31 
 32 /**
 33  * struct sensor_hub_data - Hold a instance data for a HID hub device
 34  * @hsdev:              Stored hid instance for current hub device.
 35  * @mutex:              Mutex to serialize synchronous request.
 36  * @lock:               Spin lock to protect pending request structure.
 37  * @dyn_callback_list:  Holds callback function
 38  * @dyn_callback_lock:  spin lock to protect callback list
 39  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
 40  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
 41  * @ref_cnt:            Number of MFD clients have opened this device
 42  */
 43 struct sensor_hub_data {
 44         struct mutex mutex;
 45         spinlock_t lock;
 46         struct list_head dyn_callback_list;
 47         spinlock_t dyn_callback_lock;
 48         struct mfd_cell *hid_sensor_hub_client_devs;
 49         int hid_sensor_client_cnt;
 50         unsigned long quirks;
 51         int ref_cnt;
 52 };
 53 
 54 /**
 55  * struct hid_sensor_hub_callbacks_list - Stores callback list
 56  * @list:               list head.
 57  * @usage_id:           usage id for a physical device.
 58  * @usage_callback:     Stores registered callback functions.
 59  * @priv:               Private data for a physical device.
 60  */
 61 struct hid_sensor_hub_callbacks_list {
 62         struct list_head list;
 63         u32 usage_id;
 64         struct hid_sensor_hub_device *hsdev;
 65         struct hid_sensor_hub_callbacks *usage_callback;
 66         void *priv;
 67 };
 68 
 69 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
 70                                                 int dir)
 71 {
 72         struct hid_report *report;
 73 
 74         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
 75                 if (report->id == id)
 76                         return report;
 77         }
 78         hid_warn(hdev, "No report with id 0x%x found\n", id);
 79 
 80         return NULL;
 81 }
 82 
 83 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
 84 {
 85         int i;
 86         int count = 0;
 87 
 88         for (i = 0; i < hdev->maxcollection; ++i) {
 89                 struct hid_collection *collection = &hdev->collection[i];
 90                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 91                     collection->type == HID_COLLECTION_APPLICATION)
 92                         ++count;
 93         }
 94 
 95         return count;
 96 }
 97 
 98 static void sensor_hub_fill_attr_info(
 99                 struct hid_sensor_hub_attribute_info *info,
100                 s32 index, s32 report_id, struct hid_field *field)
101 {
102         info->index = index;
103         info->report_id = report_id;
104         info->units = field->unit;
105         info->unit_expo = field->unit_exponent;
106         info->size = (field->report_size * field->report_count)/8;
107         info->logical_minimum = field->logical_minimum;
108         info->logical_maximum = field->logical_maximum;
109 }
110 
111 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
112                                         struct hid_device *hdev,
113                                         u32 usage_id,
114                                         int collection_index,
115                                         struct hid_sensor_hub_device **hsdev,
116                                         void **priv)
117 {
118         struct hid_sensor_hub_callbacks_list *callback;
119         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
120         unsigned long flags;
121 
122         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
123         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
124                 if ((callback->usage_id == usage_id ||
125                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
126                         (collection_index >=
127                                 callback->hsdev->start_collection_index) &&
128                         (collection_index <
129                                 callback->hsdev->end_collection_index)) {
130                         *priv = callback->priv;
131                         *hsdev = callback->hsdev;
132                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
133                                                flags);
134                         return callback->usage_callback;
135                 }
136         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
137 
138         return NULL;
139 }
140 
141 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
142                         u32 usage_id,
143                         struct hid_sensor_hub_callbacks *usage_callback)
144 {
145         struct hid_sensor_hub_callbacks_list *callback;
146         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
147         unsigned long flags;
148 
149         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
150         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
151                 if (callback->usage_id == usage_id &&
152                                                 callback->hsdev == hsdev) {
153                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
154                         return -EINVAL;
155                 }
156         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
157         if (!callback) {
158                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
159                 return -ENOMEM;
160         }
161         callback->hsdev = hsdev;
162         callback->usage_callback = usage_callback;
163         callback->usage_id = usage_id;
164         callback->priv = NULL;
165         /*
166          * If there is a handler registered for the collection type, then
167          * it will handle all reports for sensors in this collection. If
168          * there is also an individual sensor handler registration, then
169          * we want to make sure that the reports are directed to collection
170          * handler, as this may be a fusion sensor. So add collection handlers
171          * to the beginning of the list, so that they are matched first.
172          */
173         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
174                 list_add(&callback->list, &pdata->dyn_callback_list);
175         else
176                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
177         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
178 
179         return 0;
180 }
181 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
182 
183 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
184                                 u32 usage_id)
185 {
186         struct hid_sensor_hub_callbacks_list *callback;
187         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
188         unsigned long flags;
189 
190         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
191         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
192                 if (callback->usage_id == usage_id &&
193                                                 callback->hsdev == hsdev) {
194                         list_del(&callback->list);
195                         kfree(callback);
196                         break;
197                 }
198         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
199 
200         return 0;
201 }
202 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
203 
204 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
205                            u32 field_index, int buffer_size, void *buffer)
206 {
207         struct hid_report *report;
208         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
209         __s32 *buf32 = buffer;
210         int i = 0;
211         int remaining_bytes;
212         __s32 value;
213         int ret = 0;
214 
215         memset(buffer, 0, buffer_size);
216         mutex_lock(&data->mutex);
217         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
218         if (!report || (field_index >= report->maxfield)) {
219                 ret = -EINVAL;
220                 goto done_proc;
221         }
222 
223         remaining_bytes = buffer_size % sizeof(__s32);
224         buffer_size = buffer_size / sizeof(__s32);
225         if (buffer_size) {
226                 for (i = 0; i < buffer_size; ++i) {
227                         hid_set_field(report->field[field_index], i,
228                                       (__force __s32)cpu_to_le32(*buf32));
229                         ++buf32;
230                 }
231         }
232         if (remaining_bytes) {
233                 value = 0;
234                 memcpy(&value, (u8 *)buf32, remaining_bytes);
235                 hid_set_field(report->field[field_index], i,
236                               (__force __s32)cpu_to_le32(value));
237         }
238         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
239         hid_hw_wait(hsdev->hdev);
240 
241 done_proc:
242         mutex_unlock(&data->mutex);
243 
244         return ret;
245 }
246 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
247 
248 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
249                            u32 field_index, int buffer_size, void *buffer)
250 {
251         struct hid_report *report;
252         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
253         int report_size;
254         int ret = 0;
255         u8 *val_ptr;
256         int buffer_index = 0;
257         int i;
258 
259         mutex_lock(&data->mutex);
260         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
261         if (!report || (field_index >= report->maxfield) ||
262             report->field[field_index]->report_count < 1) {
263                 ret = -EINVAL;
264                 goto done_proc;
265         }
266         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
267         hid_hw_wait(hsdev->hdev);
268 
269         /* calculate number of bytes required to read this field */
270         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
271                                    8) *
272                                    report->field[field_index]->report_count;
273         if (!report_size) {
274                 ret = -EINVAL;
275                 goto done_proc;
276         }
277         ret = min(report_size, buffer_size);
278 
279         val_ptr = (u8 *)report->field[field_index]->value;
280         for (i = 0; i < report->field[field_index]->report_count; ++i) {
281                 if (buffer_index >= ret)
282                         break;
283 
284                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
285                        report->field[field_index]->report_size / 8);
286                 val_ptr += sizeof(__s32);
287                 buffer_index += (report->field[field_index]->report_size / 8);
288         }
289 
290 done_proc:
291         mutex_unlock(&data->mutex);
292 
293         return ret;
294 }
295 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
296 
297 
298 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
299                                         u32 usage_id,
300                                         u32 attr_usage_id, u32 report_id,
301                                         enum sensor_hub_read_flags flag)
302 {
303         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
304         unsigned long flags;
305         struct hid_report *report;
306         int ret_val = 0;
307 
308         report = sensor_hub_report(report_id, hsdev->hdev,
309                                    HID_INPUT_REPORT);
310         if (!report)
311                 return -EINVAL;
312 
313         mutex_lock(hsdev->mutex_ptr);
314         if (flag == SENSOR_HUB_SYNC) {
315                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
316                 init_completion(&hsdev->pending.ready);
317                 hsdev->pending.usage_id = usage_id;
318                 hsdev->pending.attr_usage_id = attr_usage_id;
319                 hsdev->pending.raw_size = 0;
320 
321                 spin_lock_irqsave(&data->lock, flags);
322                 hsdev->pending.status = true;
323                 spin_unlock_irqrestore(&data->lock, flags);
324         }
325         mutex_lock(&data->mutex);
326         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
327         mutex_unlock(&data->mutex);
328         if (flag == SENSOR_HUB_SYNC) {
329                 wait_for_completion_interruptible_timeout(
330                                                 &hsdev->pending.ready, HZ*5);
331                 switch (hsdev->pending.raw_size) {
332                 case 1:
333                         ret_val = *(u8 *)hsdev->pending.raw_data;
334                         break;
335                 case 2:
336                         ret_val = *(u16 *)hsdev->pending.raw_data;
337                         break;
338                 case 4:
339                         ret_val = *(u32 *)hsdev->pending.raw_data;
340                         break;
341                 default:
342                         ret_val = 0;
343                 }
344                 kfree(hsdev->pending.raw_data);
345                 hsdev->pending.status = false;
346         }
347         mutex_unlock(hsdev->mutex_ptr);
348 
349         return ret_val;
350 }
351 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
352 
353 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
354                                 u32 report_id, int field_index, u32 usage_id)
355 {
356         struct hid_report *report;
357         struct hid_field *field;
358         int i;
359 
360         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
361         if (!report || (field_index >= report->maxfield))
362                 goto done_proc;
363 
364         field = report->field[field_index];
365         for (i = 0; i < field->maxusage; ++i) {
366                 if (field->usage[i].hid == usage_id)
367                         return field->usage[i].usage_index;
368         }
369 
370 done_proc:
371         return -EINVAL;
372 }
373 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
374 
375 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
376                                 u8 type,
377                                 u32 usage_id,
378                                 u32 attr_usage_id,
379                                 struct hid_sensor_hub_attribute_info *info)
380 {
381         int ret = -1;
382         int i;
383         struct hid_report *report;
384         struct hid_field *field;
385         struct hid_report_enum *report_enum;
386         struct hid_device *hdev = hsdev->hdev;
387 
388         /* Initialize with defaults */
389         info->usage_id = usage_id;
390         info->attrib_id = attr_usage_id;
391         info->report_id = -1;
392         info->index = -1;
393         info->units = -1;
394         info->unit_expo = -1;
395 
396         report_enum = &hdev->report_enum[type];
397         list_for_each_entry(report, &report_enum->report_list, list) {
398                 for (i = 0; i < report->maxfield; ++i) {
399                         field = report->field[i];
400                         if (field->maxusage) {
401                                 if (field->physical == 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         ptr++; /* Skip report id */
492 
493         spin_lock_irqsave(&pdata->lock, flags);
494 
495         for (i = 0; i < report->maxfield; ++i) {
496                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
497                                 i, report->field[i]->usage->collection_index,
498                                 report->field[i]->usage->hid,
499                                 (report->field[i]->report_size *
500                                         report->field[i]->report_count)/8);
501                 sz = (report->field[i]->report_size *
502                                         report->field[i]->report_count)/8;
503                 collection = &hdev->collection[
504                                 report->field[i]->usage->collection_index];
505                 hid_dbg(hdev, "collection->usage %x\n",
506                                         collection->usage);
507 
508                 callback = sensor_hub_get_callback(hdev,
509                                 report->field[i]->physical,
510                                 report->field[i]->usage[0].collection_index,
511                                 &hsdev, &priv);
512                 if (!callback) {
513                         ptr += sz;
514                         continue;
515                 }
516                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
517                                               report->field[i]->usage->hid ||
518                                               hsdev->pending.attr_usage_id ==
519                                               report->field[i]->logical)) {
520                         hid_dbg(hdev, "data was pending ...\n");
521                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
522                         if (hsdev->pending.raw_data)
523                                 hsdev->pending.raw_size = sz;
524                         else
525                                 hsdev->pending.raw_size = 0;
526                         complete(&hsdev->pending.ready);
527                 }
528                 if (callback->capture_sample) {
529                         if (report->field[i]->logical)
530                                 callback->capture_sample(hsdev,
531                                         report->field[i]->logical, sz, ptr,
532                                         callback->pdev);
533                         else
534                                 callback->capture_sample(hsdev,
535                                         report->field[i]->usage->hid, sz, ptr,
536                                         callback->pdev);
537                 }
538                 ptr += sz;
539         }
540         if (callback && collection && callback->send_event)
541                 callback->send_event(hsdev, collection->usage,
542                                 callback->pdev);
543         spin_unlock_irqrestore(&pdata->lock, flags);
544 
545         return 1;
546 }
547 
548 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
549 {
550         int ret = 0;
551         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
552 
553         mutex_lock(&data->mutex);
554         if (!data->ref_cnt) {
555                 ret = hid_hw_open(hsdev->hdev);
556                 if (ret) {
557                         hid_err(hsdev->hdev, "failed to open hid device\n");
558                         mutex_unlock(&data->mutex);
559                         return ret;
560                 }
561         }
562         data->ref_cnt++;
563         mutex_unlock(&data->mutex);
564 
565         return ret;
566 }
567 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
568 
569 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
570 {
571         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
572 
573         mutex_lock(&data->mutex);
574         data->ref_cnt--;
575         if (!data->ref_cnt)
576                 hid_hw_close(hsdev->hdev);
577         mutex_unlock(&data->mutex);
578 }
579 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
580 
581 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
582                 unsigned int *rsize)
583 {
584         int index;
585         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
586         unsigned char report_block[] = {
587                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
588         unsigned char power_block[] = {
589                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
590 
591         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
592                 hid_dbg(hdev, "No Enum quirks\n");
593                 return rdesc;
594         }
595 
596         /* Looks for power and report state usage id and force to 1 */
597         for (index = 0; index < *rsize; ++index) {
598                 if (((*rsize - index) > sizeof(report_block)) &&
599                         !memcmp(&rdesc[index], report_block,
600                                                 sizeof(report_block))) {
601                         rdesc[index + 4] = 0x01;
602                         index += sizeof(report_block);
603                 }
604                 if (((*rsize - index) > sizeof(power_block)) &&
605                         !memcmp(&rdesc[index], power_block,
606                                                 sizeof(power_block))) {
607                         rdesc[index + 4] = 0x01;
608                         index += sizeof(power_block);
609                 }
610         }
611 
612         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
613          * minimum for magnetic flux axis greater than the maximum */
614         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
615                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
616                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
617                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
618                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
619                 /* Sets negative logical minimum for mag x, y and z */
620                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
621                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
622                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
623                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
624         }
625 
626         return rdesc;
627 }
628 
629 static int sensor_hub_probe(struct hid_device *hdev,
630                                 const struct hid_device_id *id)
631 {
632         int ret;
633         struct sensor_hub_data *sd;
634         int i;
635         char *name;
636         int dev_cnt;
637         struct hid_sensor_hub_device *hsdev;
638         struct hid_sensor_hub_device *last_hsdev = NULL;
639         struct hid_sensor_hub_device *collection_hsdev = NULL;
640 
641         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
642         if (!sd) {
643                 hid_err(hdev, "cannot allocate Sensor data\n");
644                 return -ENOMEM;
645         }
646 
647         hid_set_drvdata(hdev, sd);
648         sd->quirks = id->driver_data;
649 
650         spin_lock_init(&sd->lock);
651         spin_lock_init(&sd->dyn_callback_lock);
652         mutex_init(&sd->mutex);
653         ret = hid_parse(hdev);
654         if (ret) {
655                 hid_err(hdev, "parse failed\n");
656                 return ret;
657         }
658         INIT_LIST_HEAD(&hdev->inputs);
659 
660         ret = hid_hw_start(hdev, 0);
661         if (ret) {
662                 hid_err(hdev, "hw start failed\n");
663                 return ret;
664         }
665         INIT_LIST_HEAD(&sd->dyn_callback_list);
666         sd->hid_sensor_client_cnt = 0;
667 
668         dev_cnt = sensor_hub_get_physical_device_count(hdev);
669         if (dev_cnt > HID_MAX_PHY_DEVICES) {
670                 hid_err(hdev, "Invalid Physical device count\n");
671                 ret = -EINVAL;
672                 goto err_stop_hw;
673         }
674         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
675                                                       sizeof(struct mfd_cell),
676                                                       GFP_KERNEL);
677         if (sd->hid_sensor_hub_client_devs == NULL) {
678                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
679                 ret = -ENOMEM;
680                 goto err_stop_hw;
681         }
682 
683         for (i = 0; i < hdev->maxcollection; ++i) {
684                 struct hid_collection *collection = &hdev->collection[i];
685 
686                 if (collection->type == HID_COLLECTION_PHYSICAL ||
687                     collection->type == HID_COLLECTION_APPLICATION) {
688 
689                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
690                                              GFP_KERNEL);
691                         if (!hsdev) {
692                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
693                                 ret = -ENOMEM;
694                                 goto err_stop_hw;
695                         }
696                         hsdev->hdev = hdev;
697                         hsdev->vendor_id = hdev->vendor;
698                         hsdev->product_id = hdev->product;
699                         hsdev->usage = collection->usage;
700                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
701                                                         sizeof(struct mutex),
702                                                         GFP_KERNEL);
703                         if (!hsdev->mutex_ptr) {
704                                 ret = -ENOMEM;
705                                 goto err_stop_hw;
706                         }
707                         mutex_init(hsdev->mutex_ptr);
708                         hsdev->start_collection_index = i;
709                         if (last_hsdev)
710                                 last_hsdev->end_collection_index = i;
711                         last_hsdev = hsdev;
712                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
713                                               "HID-SENSOR-%x",
714                                               collection->usage);
715                         if (name == NULL) {
716                                 hid_err(hdev, "Failed MFD device name\n");
717                                 ret = -ENOMEM;
718                                 goto err_stop_hw;
719                         }
720                         sd->hid_sensor_hub_client_devs[
721                                 sd->hid_sensor_client_cnt].name = name;
722                         sd->hid_sensor_hub_client_devs[
723                                 sd->hid_sensor_client_cnt].platform_data =
724                                                         hsdev;
725                         sd->hid_sensor_hub_client_devs[
726                                 sd->hid_sensor_client_cnt].pdata_size =
727                                                         sizeof(*hsdev);
728                         hid_dbg(hdev, "Adding %s:%d\n", name,
729                                         hsdev->start_collection_index);
730                         sd->hid_sensor_client_cnt++;
731                         if (collection_hsdev)
732                                 collection_hsdev->end_collection_index = i;
733                         if (collection->type == HID_COLLECTION_APPLICATION &&
734                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
735                                 collection_hsdev = hsdev;
736                 }
737         }
738         if (last_hsdev)
739                 last_hsdev->end_collection_index = i;
740         if (collection_hsdev)
741                 collection_hsdev->end_collection_index = i;
742 
743         ret = mfd_add_hotplug_devices(&hdev->dev,
744                         sd->hid_sensor_hub_client_devs,
745                         sd->hid_sensor_client_cnt);
746         if (ret < 0)
747                 goto err_stop_hw;
748 
749         return ret;
750 
751 err_stop_hw:
752         hid_hw_stop(hdev);
753 
754         return ret;
755 }
756 
757 static void sensor_hub_remove(struct hid_device *hdev)
758 {
759         struct sensor_hub_data *data = hid_get_drvdata(hdev);
760         unsigned long flags;
761         int i;
762 
763         hid_dbg(hdev, " hardware removed\n");
764         hid_hw_close(hdev);
765         hid_hw_stop(hdev);
766         spin_lock_irqsave(&data->lock, flags);
767         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
768                 struct hid_sensor_hub_device *hsdev =
769                         data->hid_sensor_hub_client_devs[i].platform_data;
770                 if (hsdev->pending.status)
771                         complete(&hsdev->pending.ready);
772         }
773         spin_unlock_irqrestore(&data->lock, flags);
774         mfd_remove_devices(&hdev->dev);
775         hid_set_drvdata(hdev, NULL);
776         mutex_destroy(&data->mutex);
777 }
778 
779 static const struct hid_device_id sensor_hub_devices[] = {
780         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
781                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
782                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
783         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
784                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
785                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
786         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
787                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
788                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
789         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
790                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
791                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
792         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
793                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
794                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
795         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
796                         USB_DEVICE_ID_MS_TYPE_COVER_2),
797                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
798         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
799                         USB_DEVICE_ID_STM_HID_SENSOR),
800                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
801         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
802                         USB_DEVICE_ID_STM_HID_SENSOR_1),
803                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
804         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
805                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
806                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
807         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
808                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
809                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
810         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
811                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
812                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
813         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
814                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
815                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
816         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
817                         0x22D8),
818                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
819         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
820                      HID_ANY_ID) },
821         { }
822 };
823 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
824 
825 static struct hid_driver sensor_hub_driver = {
826         .name = "hid-sensor-hub",
827         .id_table = sensor_hub_devices,
828         .probe = sensor_hub_probe,
829         .remove = sensor_hub_remove,
830         .raw_event = sensor_hub_raw_event,
831         .report_fixup = sensor_hub_report_fixup,
832 #ifdef CONFIG_PM
833         .suspend = sensor_hub_suspend,
834         .resume = sensor_hub_resume,
835         .reset_resume = sensor_hub_reset_resume,
836 #endif
837 };
838 module_hid_driver(sensor_hub_driver);
839 
840 MODULE_DESCRIPTION("HID Sensor Hub driver");
841 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
842 MODULE_LICENSE("GPL");
843 

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