Version:  2.0.40 2.2.26 2.4.37 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 4.10

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         mutex_lock(&data->mutex);
216         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
217         if (!report || (field_index >= report->maxfield)) {
218                 ret = -EINVAL;
219                 goto done_proc;
220         }
221 
222         remaining_bytes = buffer_size % sizeof(__s32);
223         buffer_size = buffer_size / sizeof(__s32);
224         if (buffer_size) {
225                 for (i = 0; i < buffer_size; ++i) {
226                         hid_set_field(report->field[field_index], i,
227                                       (__force __s32)cpu_to_le32(*buf32));
228                         ++buf32;
229                 }
230         }
231         if (remaining_bytes) {
232                 value = 0;
233                 memcpy(&value, (u8 *)buf32, remaining_bytes);
234                 hid_set_field(report->field[field_index], i,
235                               (__force __s32)cpu_to_le32(value));
236         }
237         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
238         hid_hw_wait(hsdev->hdev);
239 
240 done_proc:
241         mutex_unlock(&data->mutex);
242 
243         return ret;
244 }
245 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
246 
247 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
248                            u32 field_index, int buffer_size, void *buffer)
249 {
250         struct hid_report *report;
251         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
252         int report_size;
253         int ret = 0;
254         u8 *val_ptr;
255         int buffer_index = 0;
256         int i;
257 
258         memset(buffer, 0, buffer_size);
259 
260         mutex_lock(&data->mutex);
261         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
262         if (!report || (field_index >= report->maxfield) ||
263             report->field[field_index]->report_count < 1) {
264                 ret = -EINVAL;
265                 goto done_proc;
266         }
267         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
268         hid_hw_wait(hsdev->hdev);
269 
270         /* calculate number of bytes required to read this field */
271         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
272                                    8) *
273                                    report->field[field_index]->report_count;
274         if (!report_size) {
275                 ret = -EINVAL;
276                 goto done_proc;
277         }
278         ret = min(report_size, buffer_size);
279 
280         val_ptr = (u8 *)report->field[field_index]->value;
281         for (i = 0; i < report->field[field_index]->report_count; ++i) {
282                 if (buffer_index >= ret)
283                         break;
284 
285                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
286                        report->field[field_index]->report_size / 8);
287                 val_ptr += sizeof(__s32);
288                 buffer_index += (report->field[field_index]->report_size / 8);
289         }
290 
291 done_proc:
292         mutex_unlock(&data->mutex);
293 
294         return ret;
295 }
296 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
297 
298 
299 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
300                                         u32 usage_id,
301                                         u32 attr_usage_id, u32 report_id,
302                                         enum sensor_hub_read_flags flag)
303 {
304         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
305         unsigned long flags;
306         struct hid_report *report;
307         int ret_val = 0;
308 
309         report = sensor_hub_report(report_id, hsdev->hdev,
310                                    HID_INPUT_REPORT);
311         if (!report)
312                 return -EINVAL;
313 
314         mutex_lock(hsdev->mutex_ptr);
315         if (flag == SENSOR_HUB_SYNC) {
316                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
317                 init_completion(&hsdev->pending.ready);
318                 hsdev->pending.usage_id = usage_id;
319                 hsdev->pending.attr_usage_id = attr_usage_id;
320                 hsdev->pending.raw_size = 0;
321 
322                 spin_lock_irqsave(&data->lock, flags);
323                 hsdev->pending.status = true;
324                 spin_unlock_irqrestore(&data->lock, flags);
325         }
326         mutex_lock(&data->mutex);
327         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
328         mutex_unlock(&data->mutex);
329         if (flag == SENSOR_HUB_SYNC) {
330                 wait_for_completion_interruptible_timeout(
331                                                 &hsdev->pending.ready, HZ*5);
332                 switch (hsdev->pending.raw_size) {
333                 case 1:
334                         ret_val = *(u8 *)hsdev->pending.raw_data;
335                         break;
336                 case 2:
337                         ret_val = *(u16 *)hsdev->pending.raw_data;
338                         break;
339                 case 4:
340                         ret_val = *(u32 *)hsdev->pending.raw_data;
341                         break;
342                 default:
343                         ret_val = 0;
344                 }
345                 kfree(hsdev->pending.raw_data);
346                 hsdev->pending.status = false;
347         }
348         mutex_unlock(hsdev->mutex_ptr);
349 
350         return ret_val;
351 }
352 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
353 
354 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
355                                 u32 report_id, int field_index, u32 usage_id)
356 {
357         struct hid_report *report;
358         struct hid_field *field;
359         int i;
360 
361         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
362         if (!report || (field_index >= report->maxfield))
363                 goto done_proc;
364 
365         field = report->field[field_index];
366         for (i = 0; i < field->maxusage; ++i) {
367                 if (field->usage[i].hid == usage_id)
368                         return field->usage[i].usage_index;
369         }
370 
371 done_proc:
372         return -EINVAL;
373 }
374 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
375 
376 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
377                                 u8 type,
378                                 u32 usage_id,
379                                 u32 attr_usage_id,
380                                 struct hid_sensor_hub_attribute_info *info)
381 {
382         int ret = -1;
383         int i;
384         struct hid_report *report;
385         struct hid_field *field;
386         struct hid_report_enum *report_enum;
387         struct hid_device *hdev = hsdev->hdev;
388 
389         /* Initialize with defaults */
390         info->usage_id = usage_id;
391         info->attrib_id = attr_usage_id;
392         info->report_id = -1;
393         info->index = -1;
394         info->units = -1;
395         info->unit_expo = -1;
396 
397         report_enum = &hdev->report_enum[type];
398         list_for_each_entry(report, &report_enum->report_list, list) {
399                 for (i = 0; i < report->maxfield; ++i) {
400                         field = report->field[i];
401                         if (field->maxusage) {
402                                 if (field->physical == usage_id &&
403                                         (field->logical == attr_usage_id ||
404                                         field->usage[0].hid ==
405                                                         attr_usage_id) &&
406                                         (field->usage[0].collection_index >=
407                                         hsdev->start_collection_index) &&
408                                         (field->usage[0].collection_index <
409                                         hsdev->end_collection_index)) {
410 
411                                         sensor_hub_fill_attr_info(info, i,
412                                                                 report->id,
413                                                                 field);
414                                         ret = 0;
415                                         break;
416                                 }
417                         }
418                 }
419 
420         }
421 
422         return ret;
423 }
424 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
425 
426 #ifdef CONFIG_PM
427 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
428 {
429         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
430         struct hid_sensor_hub_callbacks_list *callback;
431         unsigned long flags;
432 
433         hid_dbg(hdev, " sensor_hub_suspend\n");
434         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
435         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
436                 if (callback->usage_callback->suspend)
437                         callback->usage_callback->suspend(
438                                         callback->hsdev, callback->priv);
439         }
440         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
441 
442         return 0;
443 }
444 
445 static int sensor_hub_resume(struct hid_device *hdev)
446 {
447         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
448         struct hid_sensor_hub_callbacks_list *callback;
449         unsigned long flags;
450 
451         hid_dbg(hdev, " sensor_hub_resume\n");
452         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
453         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
454                 if (callback->usage_callback->resume)
455                         callback->usage_callback->resume(
456                                         callback->hsdev, callback->priv);
457         }
458         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
459 
460         return 0;
461 }
462 
463 static int sensor_hub_reset_resume(struct hid_device *hdev)
464 {
465         return 0;
466 }
467 #endif
468 
469 /*
470  * Handle raw report as sent by device
471  */
472 static int sensor_hub_raw_event(struct hid_device *hdev,
473                 struct hid_report *report, u8 *raw_data, int size)
474 {
475         int i;
476         u8 *ptr;
477         int sz;
478         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
479         unsigned long flags;
480         struct hid_sensor_hub_callbacks *callback = NULL;
481         struct hid_collection *collection = NULL;
482         void *priv = NULL;
483         struct hid_sensor_hub_device *hsdev = NULL;
484 
485         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
486                          report->id, size, report->type);
487         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
488         if (report->type != HID_INPUT_REPORT)
489                 return 1;
490 
491         ptr = raw_data;
492         ptr++; /* Skip report id */
493 
494         spin_lock_irqsave(&pdata->lock, flags);
495 
496         for (i = 0; i < report->maxfield; ++i) {
497                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
498                                 i, report->field[i]->usage->collection_index,
499                                 report->field[i]->usage->hid,
500                                 (report->field[i]->report_size *
501                                         report->field[i]->report_count)/8);
502                 sz = (report->field[i]->report_size *
503                                         report->field[i]->report_count)/8;
504                 collection = &hdev->collection[
505                                 report->field[i]->usage->collection_index];
506                 hid_dbg(hdev, "collection->usage %x\n",
507                                         collection->usage);
508 
509                 callback = sensor_hub_get_callback(hdev,
510                                 report->field[i]->physical,
511                                 report->field[i]->usage[0].collection_index,
512                                 &hsdev, &priv);
513                 if (!callback) {
514                         ptr += sz;
515                         continue;
516                 }
517                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
518                                               report->field[i]->usage->hid ||
519                                               hsdev->pending.attr_usage_id ==
520                                               report->field[i]->logical)) {
521                         hid_dbg(hdev, "data was pending ...\n");
522                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
523                         if (hsdev->pending.raw_data)
524                                 hsdev->pending.raw_size = sz;
525                         else
526                                 hsdev->pending.raw_size = 0;
527                         complete(&hsdev->pending.ready);
528                 }
529                 if (callback->capture_sample) {
530                         if (report->field[i]->logical)
531                                 callback->capture_sample(hsdev,
532                                         report->field[i]->logical, sz, ptr,
533                                         callback->pdev);
534                         else
535                                 callback->capture_sample(hsdev,
536                                         report->field[i]->usage->hid, sz, ptr,
537                                         callback->pdev);
538                 }
539                 ptr += sz;
540         }
541         if (callback && collection && callback->send_event)
542                 callback->send_event(hsdev, collection->usage,
543                                 callback->pdev);
544         spin_unlock_irqrestore(&pdata->lock, flags);
545 
546         return 1;
547 }
548 
549 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
550 {
551         int ret = 0;
552         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
553 
554         mutex_lock(&data->mutex);
555         if (!data->ref_cnt) {
556                 ret = hid_hw_open(hsdev->hdev);
557                 if (ret) {
558                         hid_err(hsdev->hdev, "failed to open hid device\n");
559                         mutex_unlock(&data->mutex);
560                         return ret;
561                 }
562         }
563         data->ref_cnt++;
564         mutex_unlock(&data->mutex);
565 
566         return ret;
567 }
568 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
569 
570 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
571 {
572         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
573 
574         mutex_lock(&data->mutex);
575         data->ref_cnt--;
576         if (!data->ref_cnt)
577                 hid_hw_close(hsdev->hdev);
578         mutex_unlock(&data->mutex);
579 }
580 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
581 
582 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
583                 unsigned int *rsize)
584 {
585         int index;
586         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
587         unsigned char report_block[] = {
588                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
589         unsigned char power_block[] = {
590                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
591 
592         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
593                 hid_dbg(hdev, "No Enum quirks\n");
594                 return rdesc;
595         }
596 
597         /* Looks for power and report state usage id and force to 1 */
598         for (index = 0; index < *rsize; ++index) {
599                 if (((*rsize - index) > sizeof(report_block)) &&
600                         !memcmp(&rdesc[index], report_block,
601                                                 sizeof(report_block))) {
602                         rdesc[index + 4] = 0x01;
603                         index += sizeof(report_block);
604                 }
605                 if (((*rsize - index) > sizeof(power_block)) &&
606                         !memcmp(&rdesc[index], power_block,
607                                                 sizeof(power_block))) {
608                         rdesc[index + 4] = 0x01;
609                         index += sizeof(power_block);
610                 }
611         }
612 
613         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
614          * minimum for magnetic flux axis greater than the maximum */
615         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
616                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
617                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
618                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
619                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
620                 /* Sets negative logical minimum for mag x, y and z */
621                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
622                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
623                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
624                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
625         }
626 
627         return rdesc;
628 }
629 
630 static int sensor_hub_probe(struct hid_device *hdev,
631                                 const struct hid_device_id *id)
632 {
633         int ret;
634         struct sensor_hub_data *sd;
635         int i;
636         char *name;
637         int dev_cnt;
638         struct hid_sensor_hub_device *hsdev;
639         struct hid_sensor_hub_device *last_hsdev = NULL;
640         struct hid_sensor_hub_device *collection_hsdev = NULL;
641 
642         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
643         if (!sd) {
644                 hid_err(hdev, "cannot allocate Sensor data\n");
645                 return -ENOMEM;
646         }
647 
648         hid_set_drvdata(hdev, sd);
649         sd->quirks = id->driver_data;
650 
651         spin_lock_init(&sd->lock);
652         spin_lock_init(&sd->dyn_callback_lock);
653         mutex_init(&sd->mutex);
654         ret = hid_parse(hdev);
655         if (ret) {
656                 hid_err(hdev, "parse failed\n");
657                 return ret;
658         }
659         INIT_LIST_HEAD(&hdev->inputs);
660 
661         ret = hid_hw_start(hdev, 0);
662         if (ret) {
663                 hid_err(hdev, "hw start failed\n");
664                 return ret;
665         }
666         INIT_LIST_HEAD(&sd->dyn_callback_list);
667         sd->hid_sensor_client_cnt = 0;
668 
669         dev_cnt = sensor_hub_get_physical_device_count(hdev);
670         if (dev_cnt > HID_MAX_PHY_DEVICES) {
671                 hid_err(hdev, "Invalid Physical device count\n");
672                 ret = -EINVAL;
673                 goto err_stop_hw;
674         }
675         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
676                                                       sizeof(struct mfd_cell),
677                                                       GFP_KERNEL);
678         if (sd->hid_sensor_hub_client_devs == NULL) {
679                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
680                 ret = -ENOMEM;
681                 goto err_stop_hw;
682         }
683 
684         for (i = 0; i < hdev->maxcollection; ++i) {
685                 struct hid_collection *collection = &hdev->collection[i];
686 
687                 if (collection->type == HID_COLLECTION_PHYSICAL ||
688                     collection->type == HID_COLLECTION_APPLICATION) {
689 
690                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
691                                              GFP_KERNEL);
692                         if (!hsdev) {
693                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
694                                 ret = -ENOMEM;
695                                 goto err_stop_hw;
696                         }
697                         hsdev->hdev = hdev;
698                         hsdev->vendor_id = hdev->vendor;
699                         hsdev->product_id = hdev->product;
700                         hsdev->usage = collection->usage;
701                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
702                                                         sizeof(struct mutex),
703                                                         GFP_KERNEL);
704                         if (!hsdev->mutex_ptr) {
705                                 ret = -ENOMEM;
706                                 goto err_stop_hw;
707                         }
708                         mutex_init(hsdev->mutex_ptr);
709                         hsdev->start_collection_index = i;
710                         if (last_hsdev)
711                                 last_hsdev->end_collection_index = i;
712                         last_hsdev = hsdev;
713                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
714                                               "HID-SENSOR-%x",
715                                               collection->usage);
716                         if (name == NULL) {
717                                 hid_err(hdev, "Failed MFD device name\n");
718                                 ret = -ENOMEM;
719                                 goto err_stop_hw;
720                         }
721                         sd->hid_sensor_hub_client_devs[
722                                 sd->hid_sensor_client_cnt].name = name;
723                         sd->hid_sensor_hub_client_devs[
724                                 sd->hid_sensor_client_cnt].platform_data =
725                                                         hsdev;
726                         sd->hid_sensor_hub_client_devs[
727                                 sd->hid_sensor_client_cnt].pdata_size =
728                                                         sizeof(*hsdev);
729                         hid_dbg(hdev, "Adding %s:%d\n", name,
730                                         hsdev->start_collection_index);
731                         sd->hid_sensor_client_cnt++;
732                         if (collection_hsdev)
733                                 collection_hsdev->end_collection_index = i;
734                         if (collection->type == HID_COLLECTION_APPLICATION &&
735                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
736                                 collection_hsdev = hsdev;
737                 }
738         }
739         if (last_hsdev)
740                 last_hsdev->end_collection_index = i;
741         if (collection_hsdev)
742                 collection_hsdev->end_collection_index = i;
743 
744         ret = mfd_add_hotplug_devices(&hdev->dev,
745                         sd->hid_sensor_hub_client_devs,
746                         sd->hid_sensor_client_cnt);
747         if (ret < 0)
748                 goto err_stop_hw;
749 
750         return ret;
751 
752 err_stop_hw:
753         hid_hw_stop(hdev);
754 
755         return ret;
756 }
757 
758 static void sensor_hub_remove(struct hid_device *hdev)
759 {
760         struct sensor_hub_data *data = hid_get_drvdata(hdev);
761         unsigned long flags;
762         int i;
763 
764         hid_dbg(hdev, " hardware removed\n");
765         hid_hw_close(hdev);
766         hid_hw_stop(hdev);
767         spin_lock_irqsave(&data->lock, flags);
768         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
769                 struct hid_sensor_hub_device *hsdev =
770                         data->hid_sensor_hub_client_devs[i].platform_data;
771                 if (hsdev->pending.status)
772                         complete(&hsdev->pending.ready);
773         }
774         spin_unlock_irqrestore(&data->lock, flags);
775         mfd_remove_devices(&hdev->dev);
776         hid_set_drvdata(hdev, NULL);
777         mutex_destroy(&data->mutex);
778 }
779 
780 static const struct hid_device_id sensor_hub_devices[] = {
781         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
782                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
783                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
784         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
785                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
786                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
787         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
788                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
789                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
790         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
791                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
792                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
793         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
794                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
795                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
796         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
797                         USB_DEVICE_ID_MS_TYPE_COVER_2),
798                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
799         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
800                         0x07bd), /* Microsoft Surface 3 */
801                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
802         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROCHIP,
803                         0x0f01), /* MM7150 */
804                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
805         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
806                         USB_DEVICE_ID_STM_HID_SENSOR),
807                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
808         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
809                         USB_DEVICE_ID_STM_HID_SENSOR_1),
810                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
811         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
812                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
813                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
814         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
815                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
816                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
817         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
818                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
819                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
820         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
821                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
822                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
823         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
824                         0x22D8),
825                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
826         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
827                      HID_ANY_ID) },
828         { }
829 };
830 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
831 
832 static struct hid_driver sensor_hub_driver = {
833         .name = "hid-sensor-hub",
834         .id_table = sensor_hub_devices,
835         .probe = sensor_hub_probe,
836         .remove = sensor_hub_remove,
837         .raw_event = sensor_hub_raw_event,
838         .report_fixup = sensor_hub_report_fixup,
839 #ifdef CONFIG_PM
840         .suspend = sensor_hub_suspend,
841         .resume = sensor_hub_resume,
842         .reset_resume = sensor_hub_reset_resume,
843 #endif
844 };
845 module_hid_driver(sensor_hub_driver);
846 
847 MODULE_DESCRIPTION("HID Sensor Hub driver");
848 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
849 MODULE_LICENSE("GPL");
850 

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