1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HID Sensors Driver
4 * Copyright (c) 2012, Intel Corporation.
5 */
6
7 #include <linux/device.h>
8 #include <linux/hid.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/mfd/core.h>
12 #include <linux/list.h>
13 #include <linux/hid-sensor-ids.h>
14 #include <linux/hid-sensor-hub.h>
15 #include "hid-ids.h"
16
17 #define HID_SENSOR_HUB_ENUM_QUIRK 0x01
18
19 /**
20 * struct sensor_hub_data - Hold a instance data for a HID hub device
21 * @mutex: Mutex to serialize synchronous request.
22 * @lock: Spin lock to protect pending request structure.
23 * @dyn_callback_list: Holds callback function
24 * @dyn_callback_lock: spin lock to protect callback list
25 * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
26 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
27 * @ref_cnt: Number of MFD clients have opened this device
28 */
29 struct sensor_hub_data {
30 struct mutex mutex;
31 spinlock_t lock;
32 struct list_head dyn_callback_list;
33 spinlock_t dyn_callback_lock;
34 struct mfd_cell *hid_sensor_hub_client_devs;
35 int hid_sensor_client_cnt;
36 int ref_cnt;
37 };
38
39 /**
40 * struct hid_sensor_hub_callbacks_list - Stores callback list
41 * @list: list head.
42 * @usage_id: usage id for a physical device.
43 * @hsdev: Stored hid instance for current hub device.
44 * @usage_callback: Stores registered callback functions.
45 * @priv: Private data for a physical device.
46 */
47 struct hid_sensor_hub_callbacks_list {
48 struct list_head list;
49 u32 usage_id;
50 struct hid_sensor_hub_device *hsdev;
51 struct hid_sensor_hub_callbacks *usage_callback;
52 void *priv;
53 };
54
sensor_hub_report(int id,struct hid_device * hdev,int dir)55 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
56 int dir)
57 {
58 struct hid_report *report;
59
60 list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
61 if (report->id == id)
62 return report;
63 }
64 hid_warn(hdev, "No report with id 0x%x found\n", id);
65
66 return NULL;
67 }
68
sensor_hub_get_physical_device_count(struct hid_device * hdev)69 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
70 {
71 int i;
72 int count = 0;
73
74 for (i = 0; i < hdev->maxcollection; ++i) {
75 struct hid_collection *collection = &hdev->collection[i];
76 if (collection->type == HID_COLLECTION_PHYSICAL ||
77 collection->type == HID_COLLECTION_APPLICATION)
78 ++count;
79 }
80
81 return count;
82 }
83
sensor_hub_fill_attr_info(struct hid_sensor_hub_attribute_info * info,s32 index,s32 report_id,struct hid_field * field)84 static void sensor_hub_fill_attr_info(
85 struct hid_sensor_hub_attribute_info *info,
86 s32 index, s32 report_id, struct hid_field *field)
87 {
88 info->index = index;
89 info->report_id = report_id;
90 info->units = field->unit;
91 info->unit_expo = field->unit_exponent;
92 info->size = (field->report_size * field->report_count)/8;
93 info->logical_minimum = field->logical_minimum;
94 info->logical_maximum = field->logical_maximum;
95 }
96
sensor_hub_get_callback(struct hid_device * hdev,u32 usage_id,int collection_index,struct hid_sensor_hub_device ** hsdev,void ** priv)97 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
98 struct hid_device *hdev,
99 u32 usage_id,
100 int collection_index,
101 struct hid_sensor_hub_device **hsdev,
102 void **priv)
103 {
104 struct hid_sensor_hub_callbacks_list *callback;
105 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
106 unsigned long flags;
107
108 spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
109 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
110 if ((callback->usage_id == usage_id ||
111 callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
112 (collection_index >=
113 callback->hsdev->start_collection_index) &&
114 (collection_index <
115 callback->hsdev->end_collection_index)) {
116 *priv = callback->priv;
117 *hsdev = callback->hsdev;
118 spin_unlock_irqrestore(&pdata->dyn_callback_lock,
119 flags);
120 return callback->usage_callback;
121 }
122 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
123
124 return NULL;
125 }
126
sensor_hub_register_callback(struct hid_sensor_hub_device * hsdev,u32 usage_id,struct hid_sensor_hub_callbacks * usage_callback)127 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
128 u32 usage_id,
129 struct hid_sensor_hub_callbacks *usage_callback)
130 {
131 struct hid_sensor_hub_callbacks_list *callback;
132 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
133 unsigned long flags;
134
135 spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
136 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
137 if (callback->usage_id == usage_id &&
138 callback->hsdev == hsdev) {
139 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
140 return -EINVAL;
141 }
142 callback = kzalloc_obj(*callback, GFP_ATOMIC);
143 if (!callback) {
144 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
145 return -ENOMEM;
146 }
147 callback->hsdev = hsdev;
148 callback->usage_callback = usage_callback;
149 callback->usage_id = usage_id;
150 callback->priv = NULL;
151 /*
152 * If there is a handler registered for the collection type, then
153 * it will handle all reports for sensors in this collection. If
154 * there is also an individual sensor handler registration, then
155 * we want to make sure that the reports are directed to collection
156 * handler, as this may be a fusion sensor. So add collection handlers
157 * to the beginning of the list, so that they are matched first.
158 */
159 if (usage_id == HID_USAGE_SENSOR_COLLECTION)
160 list_add(&callback->list, &pdata->dyn_callback_list);
161 else
162 list_add_tail(&callback->list, &pdata->dyn_callback_list);
163 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
164
165 return 0;
166 }
167 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
168
sensor_hub_remove_callback(struct hid_sensor_hub_device * hsdev,u32 usage_id)169 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
170 u32 usage_id)
171 {
172 struct hid_sensor_hub_callbacks_list *callback;
173 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
174 unsigned long flags;
175
176 spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
177 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
178 if (callback->usage_id == usage_id &&
179 callback->hsdev == hsdev) {
180 list_del(&callback->list);
181 kfree(callback);
182 break;
183 }
184 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
185
186 return 0;
187 }
188 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
189
sensor_hub_set_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)190 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
191 u32 field_index, int buffer_size, void *buffer)
192 {
193 struct hid_report *report;
194 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
195 __s32 *buf32 = buffer;
196 int i = 0;
197 int remaining_bytes;
198 __s32 value;
199 int ret = 0;
200
201 mutex_lock(&data->mutex);
202 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
203 if (!report || (field_index >= report->maxfield)) {
204 ret = -EINVAL;
205 goto done_proc;
206 }
207
208 remaining_bytes = buffer_size % sizeof(__s32);
209 buffer_size = buffer_size / sizeof(__s32);
210 if (buffer_size) {
211 for (i = 0; i < buffer_size; ++i) {
212 ret = hid_set_field(report->field[field_index], i,
213 (__force __s32)cpu_to_le32(*buf32));
214 if (ret)
215 goto done_proc;
216
217 ++buf32;
218 }
219 }
220 if (remaining_bytes) {
221 value = 0;
222 memcpy(&value, (u8 *)buf32, remaining_bytes);
223 ret = hid_set_field(report->field[field_index], i,
224 (__force __s32)cpu_to_le32(value));
225 if (ret)
226 goto done_proc;
227 }
228 hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
229 hid_hw_wait(hsdev->hdev);
230
231 done_proc:
232 mutex_unlock(&data->mutex);
233
234 return ret;
235 }
236 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
237
sensor_hub_get_feature(struct hid_sensor_hub_device * hsdev,u32 report_id,u32 field_index,int buffer_size,void * buffer)238 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
239 u32 field_index, int buffer_size, void *buffer)
240 {
241 struct hid_report *report;
242 struct hid_field *field;
243 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
244 size_t field_size;
245 size_t report_size;
246 size_t copied = 0;
247 size_t to_copy;
248 int ret = 0;
249 unsigned int i;
250
251 if (!buffer || buffer_size <= 0)
252 return -EINVAL;
253
254 memset(buffer, 0, buffer_size);
255
256 mutex_lock(&data->mutex);
257 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
258 if (!report || (field_index >= report->maxfield) ||
259 report->field[field_index]->report_count < 1) {
260 ret = -EINVAL;
261 goto done_proc;
262 }
263 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
264 hid_hw_wait(hsdev->hdev);
265
266 field = report->field[field_index];
267
268 /* calculate number of bytes required to read this field */
269 field_size = DIV_ROUND_UP(field->report_size, 8);
270 /* HID core stores each parsed report value in a __s32 slot. */
271 if (!field_size || field_size > sizeof(field->value[0])) {
272 ret = -EINVAL;
273 goto done_proc;
274 }
275 if (field->report_count > SIZE_MAX / field_size) {
276 ret = -EINVAL;
277 goto done_proc;
278 }
279
280 report_size = field_size * field->report_count;
281 report_size = min_t(size_t, report_size, buffer_size);
282
283 for (i = 0; i < field->report_count && copied < report_size; ++i) {
284 to_copy = min(field_size, report_size - copied);
285 memcpy(&((u8 *)buffer)[copied], &field->value[i], to_copy);
286 copied += to_copy;
287 }
288 ret = copied;
289
290 done_proc:
291 mutex_unlock(&data->mutex);
292
293 return ret;
294 }
295 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
296
sensor_hub_input_attr_read_values(struct hid_sensor_hub_device * hsdev,u32 usage_id,u32 attr_usage_id,u32 report_id,enum sensor_hub_read_flags flag,u32 buffer_size,u8 * buffer)297 int sensor_hub_input_attr_read_values(struct hid_sensor_hub_device *hsdev,
298 u32 usage_id, u32 attr_usage_id,
299 u32 report_id,
300 enum sensor_hub_read_flags flag,
301 u32 buffer_size, u8 *buffer)
302 {
303 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
304 struct hid_report *report;
305 unsigned long flags;
306 long cycles;
307 int ret;
308
309 report = sensor_hub_report(report_id, hsdev->hdev, 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.max_raw_size = buffer_size;
320 hsdev->pending.raw_data = buffer;
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 ret = 0;
330 if (flag == SENSOR_HUB_SYNC) {
331 cycles = wait_for_completion_interruptible_timeout(&hsdev->pending.ready,
332 HZ * 5);
333 if (cycles == 0)
334 ret = -ETIMEDOUT;
335 else if (cycles < 0)
336 ret = cycles;
337
338 hsdev->pending.status = false;
339 }
340 mutex_unlock(hsdev->mutex_ptr);
341
342 return ret;
343 }
344 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_read_values);
345
sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device * hsdev,u32 usage_id,u32 attr_usage_id,u32 report_id,enum sensor_hub_read_flags flag,bool is_signed)346 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
347 u32 usage_id,
348 u32 attr_usage_id, u32 report_id,
349 enum sensor_hub_read_flags flag,
350 bool is_signed)
351 {
352 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
353 unsigned long flags;
354 struct hid_report *report;
355 int ret_val = 0;
356
357 report = sensor_hub_report(report_id, hsdev->hdev,
358 HID_INPUT_REPORT);
359 if (!report)
360 return -EINVAL;
361
362 mutex_lock(hsdev->mutex_ptr);
363 if (flag == SENSOR_HUB_SYNC) {
364 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
365 init_completion(&hsdev->pending.ready);
366 hsdev->pending.usage_id = usage_id;
367 hsdev->pending.attr_usage_id = attr_usage_id;
368 hsdev->pending.raw_size = 0;
369
370 spin_lock_irqsave(&data->lock, flags);
371 hsdev->pending.status = true;
372 spin_unlock_irqrestore(&data->lock, flags);
373 }
374 mutex_lock(&data->mutex);
375 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
376 mutex_unlock(&data->mutex);
377 if (flag == SENSOR_HUB_SYNC) {
378 wait_for_completion_interruptible_timeout(
379 &hsdev->pending.ready, HZ*5);
380 switch (hsdev->pending.raw_size) {
381 case 1:
382 if (is_signed)
383 ret_val = *(s8 *)hsdev->pending.raw_data;
384 else
385 ret_val = *(u8 *)hsdev->pending.raw_data;
386 break;
387 case 2:
388 if (is_signed)
389 ret_val = *(s16 *)hsdev->pending.raw_data;
390 else
391 ret_val = *(u16 *)hsdev->pending.raw_data;
392 break;
393 case 4:
394 ret_val = *(u32 *)hsdev->pending.raw_data;
395 break;
396 default:
397 ret_val = 0;
398 }
399 kfree(hsdev->pending.raw_data);
400 hsdev->pending.status = false;
401 }
402 mutex_unlock(hsdev->mutex_ptr);
403
404 return ret_val;
405 }
406 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
407
hid_sensor_get_usage_index(struct hid_sensor_hub_device * hsdev,u32 report_id,int field_index,u32 usage_id)408 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
409 u32 report_id, int field_index, u32 usage_id)
410 {
411 struct hid_report *report;
412 struct hid_field *field;
413 int i;
414
415 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
416 if (!report || (field_index >= report->maxfield))
417 goto done_proc;
418
419 field = report->field[field_index];
420 for (i = 0; i < field->maxusage; ++i) {
421 if (field->usage[i].hid == usage_id)
422 return field->usage[i].usage_index;
423 }
424
425 done_proc:
426 return -EINVAL;
427 }
428 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
429
sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device * hsdev,u8 type,u32 usage_id,u32 attr_usage_id,struct hid_sensor_hub_attribute_info * info)430 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
431 u8 type,
432 u32 usage_id,
433 u32 attr_usage_id,
434 struct hid_sensor_hub_attribute_info *info)
435 {
436 int ret = -1;
437 int i;
438 struct hid_report *report;
439 struct hid_field *field;
440 struct hid_report_enum *report_enum;
441 struct hid_device *hdev = hsdev->hdev;
442
443 /* Initialize with defaults */
444 info->usage_id = usage_id;
445 info->attrib_id = attr_usage_id;
446 info->report_id = -1;
447 info->index = -1;
448 info->units = -1;
449 info->unit_expo = -1;
450
451 report_enum = &hdev->report_enum[type];
452 list_for_each_entry(report, &report_enum->report_list, list) {
453 for (i = 0; i < report->maxfield; ++i) {
454 field = report->field[i];
455 if (field->maxusage) {
456 if ((field->physical == usage_id ||
457 field->application == usage_id) &&
458 (field->logical == attr_usage_id ||
459 field->usage[0].hid ==
460 attr_usage_id) &&
461 (field->usage[0].collection_index >=
462 hsdev->start_collection_index) &&
463 (field->usage[0].collection_index <
464 hsdev->end_collection_index)) {
465
466 sensor_hub_fill_attr_info(info, i,
467 report->id,
468 field);
469 ret = 0;
470 break;
471 }
472 }
473 }
474
475 }
476
477 return ret;
478 }
479 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
480
sensor_hub_suspend(struct hid_device * hdev,pm_message_t message)481 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
482 {
483 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
484 struct hid_sensor_hub_callbacks_list *callback;
485 unsigned long flags;
486
487 hid_dbg(hdev, " sensor_hub_suspend\n");
488 spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
489 list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
490 if (callback->usage_callback->suspend)
491 callback->usage_callback->suspend(
492 callback->hsdev, callback->priv);
493 }
494 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
495
496 return 0;
497 }
498
sensor_hub_resume(struct hid_device * hdev)499 static int sensor_hub_resume(struct hid_device *hdev)
500 {
501 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
502 struct hid_sensor_hub_callbacks_list *callback;
503 unsigned long flags;
504
505 hid_dbg(hdev, " sensor_hub_resume\n");
506 spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
507 list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
508 if (callback->usage_callback->resume)
509 callback->usage_callback->resume(
510 callback->hsdev, callback->priv);
511 }
512 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
513
514 return 0;
515 }
516
sensor_hub_reset_resume(struct hid_device * hdev)517 static int sensor_hub_reset_resume(struct hid_device *hdev)
518 {
519 return 0;
520 }
521
522 /*
523 * Handle raw report as sent by device
524 */
sensor_hub_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * raw_data,int size)525 static int sensor_hub_raw_event(struct hid_device *hdev,
526 struct hid_report *report, u8 *raw_data, int size)
527 {
528 int i;
529 u8 *ptr;
530 int sz;
531 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
532 unsigned long flags;
533 struct hid_sensor_hub_callbacks *callback = NULL;
534 struct hid_collection *collection = NULL;
535 void *priv = NULL;
536 struct hid_sensor_hub_device *hsdev = NULL;
537 u32 copy_size;
538 u32 avail;
539
540 hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
541 report->id, size, report->type);
542 hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
543 if (report->type != HID_INPUT_REPORT)
544 return 1;
545
546 ptr = raw_data;
547 if (report->id)
548 ptr++; /* Skip report id */
549
550 spin_lock_irqsave(&pdata->lock, flags);
551
552 for (i = 0; i < report->maxfield; ++i) {
553 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
554 i, report->field[i]->usage->collection_index,
555 report->field[i]->usage->hid,
556 (report->field[i]->report_size *
557 report->field[i]->report_count)/8);
558 sz = (report->field[i]->report_size *
559 report->field[i]->report_count)/8;
560 collection = &hdev->collection[
561 report->field[i]->usage->collection_index];
562 hid_dbg(hdev, "collection->usage %x\n",
563 collection->usage);
564
565 callback = sensor_hub_get_callback(hdev,
566 report->field[i]->physical ? report->field[i]->physical :
567 report->field[i]->application,
568 report->field[i]->usage[0].collection_index,
569 &hsdev, &priv);
570 if (!callback) {
571 ptr += sz;
572 continue;
573 }
574 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
575 report->field[i]->usage->hid ||
576 hsdev->pending.attr_usage_id ==
577 report->field[i]->logical)) {
578 hid_dbg(hdev, "data was pending ...\n");
579 if (hsdev->pending.max_raw_size) {
580 if (hsdev->pending.index < hsdev->pending.max_raw_size) {
581 avail = hsdev->pending.max_raw_size - hsdev->pending.index;
582 copy_size = clamp(sz, 0U, avail);
583
584 memcpy(hsdev->pending.raw_data + hsdev->pending.index,
585 ptr, copy_size);
586 hsdev->pending.index += copy_size;
587 if (hsdev->pending.index >= hsdev->pending.max_raw_size) {
588 hsdev->pending.raw_size = hsdev->pending.index;
589 complete(&hsdev->pending.ready);
590 }
591 }
592 } else {
593 hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
594 if (hsdev->pending.raw_data)
595 hsdev->pending.raw_size = sz;
596 else
597 hsdev->pending.raw_size = 0;
598 complete(&hsdev->pending.ready);
599 }
600 }
601 if (callback->capture_sample) {
602 if (report->field[i]->logical)
603 callback->capture_sample(hsdev,
604 report->field[i]->logical, sz, ptr,
605 callback->pdev);
606 else
607 callback->capture_sample(hsdev,
608 report->field[i]->usage->hid, sz, ptr,
609 callback->pdev);
610 }
611 ptr += sz;
612 }
613 if (callback && collection && callback->send_event)
614 callback->send_event(hsdev, collection->usage,
615 callback->pdev);
616 spin_unlock_irqrestore(&pdata->lock, flags);
617
618 return 1;
619 }
620
sensor_hub_device_open(struct hid_sensor_hub_device * hsdev)621 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
622 {
623 int ret = 0;
624 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
625
626 mutex_lock(&data->mutex);
627 if (!data->ref_cnt) {
628 ret = hid_hw_open(hsdev->hdev);
629 if (ret) {
630 hid_err(hsdev->hdev, "failed to open hid device\n");
631 mutex_unlock(&data->mutex);
632 return ret;
633 }
634 }
635 data->ref_cnt++;
636 mutex_unlock(&data->mutex);
637
638 return ret;
639 }
640 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
641
sensor_hub_device_close(struct hid_sensor_hub_device * hsdev)642 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
643 {
644 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
645
646 mutex_lock(&data->mutex);
647 data->ref_cnt--;
648 if (!data->ref_cnt)
649 hid_hw_close(hsdev->hdev);
650 mutex_unlock(&data->mutex);
651 }
652 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
653
sensor_hub_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)654 static const __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
655 unsigned int *rsize)
656 {
657 /*
658 * Checks if the report descriptor of Thinkpad Helix 2 has a logical
659 * minimum for magnetic flux axis greater than the maximum.
660 */
661 if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
662 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
663 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
664 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
665 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
666 /* Sets negative logical minimum for mag x, y and z */
667 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
668 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
669 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
670 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
671 }
672
673 return rdesc;
674 }
675
sensor_hub_probe(struct hid_device * hdev,const struct hid_device_id * id)676 static int sensor_hub_probe(struct hid_device *hdev,
677 const struct hid_device_id *id)
678 {
679 int ret;
680 struct sensor_hub_data *sd;
681 int i;
682 char *name;
683 int dev_cnt;
684 struct hid_sensor_hub_device *hsdev;
685 struct hid_sensor_hub_device *last_hsdev = NULL;
686 struct hid_sensor_hub_device *collection_hsdev = NULL;
687
688 sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
689 if (!sd) {
690 hid_err(hdev, "cannot allocate Sensor data\n");
691 return -ENOMEM;
692 }
693
694 hid_set_drvdata(hdev, sd);
695
696 spin_lock_init(&sd->lock);
697 spin_lock_init(&sd->dyn_callback_lock);
698 mutex_init(&sd->mutex);
699 ret = hid_parse(hdev);
700 if (ret) {
701 hid_err(hdev, "parse failed\n");
702 return ret;
703 }
704 INIT_LIST_HEAD(&hdev->inputs);
705
706 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT | HID_CONNECT_DRIVER);
707 if (ret) {
708 hid_err(hdev, "hw start failed\n");
709 return ret;
710 }
711 INIT_LIST_HEAD(&sd->dyn_callback_list);
712 sd->hid_sensor_client_cnt = 0;
713
714 dev_cnt = sensor_hub_get_physical_device_count(hdev);
715 if (dev_cnt > HID_MAX_PHY_DEVICES) {
716 hid_err(hdev, "Invalid Physical device count\n");
717 ret = -EINVAL;
718 goto err_stop_hw;
719 }
720 sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
721 dev_cnt,
722 sizeof(struct mfd_cell),
723 GFP_KERNEL);
724 if (sd->hid_sensor_hub_client_devs == NULL) {
725 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
726 ret = -ENOMEM;
727 goto err_stop_hw;
728 }
729
730 for (i = 0; i < hdev->maxcollection; ++i) {
731 struct hid_collection *collection = &hdev->collection[i];
732
733 if (collection->type == HID_COLLECTION_PHYSICAL ||
734 collection->type == HID_COLLECTION_APPLICATION) {
735
736 hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
737 GFP_KERNEL);
738 if (!hsdev) {
739 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
740 ret = -ENOMEM;
741 goto err_stop_hw;
742 }
743 hsdev->hdev = hdev;
744 hsdev->vendor_id = hdev->vendor;
745 hsdev->product_id = hdev->product;
746 hsdev->usage = collection->usage;
747 hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
748 sizeof(struct mutex),
749 GFP_KERNEL);
750 if (!hsdev->mutex_ptr) {
751 ret = -ENOMEM;
752 goto err_stop_hw;
753 }
754 mutex_init(hsdev->mutex_ptr);
755 hsdev->start_collection_index = i;
756 if (last_hsdev)
757 last_hsdev->end_collection_index = i;
758 last_hsdev = hsdev;
759 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
760 "HID-SENSOR-%x",
761 collection->usage);
762 if (name == NULL) {
763 hid_err(hdev, "Failed MFD device name\n");
764 ret = -ENOMEM;
765 goto err_stop_hw;
766 }
767 sd->hid_sensor_hub_client_devs[
768 sd->hid_sensor_client_cnt].name = name;
769 sd->hid_sensor_hub_client_devs[
770 sd->hid_sensor_client_cnt].platform_data =
771 hsdev;
772 sd->hid_sensor_hub_client_devs[
773 sd->hid_sensor_client_cnt].pdata_size =
774 sizeof(*hsdev);
775 hid_dbg(hdev, "Adding %s:%d\n", name,
776 hsdev->start_collection_index);
777 sd->hid_sensor_client_cnt++;
778 if (collection_hsdev)
779 collection_hsdev->end_collection_index = i;
780 if (collection->type == HID_COLLECTION_APPLICATION &&
781 collection->usage == HID_USAGE_SENSOR_COLLECTION)
782 collection_hsdev = hsdev;
783 }
784 }
785 if (last_hsdev)
786 last_hsdev->end_collection_index = i;
787 if (collection_hsdev)
788 collection_hsdev->end_collection_index = i;
789
790 ret = mfd_add_hotplug_devices(&hdev->dev,
791 sd->hid_sensor_hub_client_devs,
792 sd->hid_sensor_client_cnt);
793 if (ret < 0)
794 goto err_stop_hw;
795
796 return ret;
797
798 err_stop_hw:
799 hid_hw_stop(hdev);
800
801 return ret;
802 }
803
sensor_hub_finalize_pending_fn(struct device * dev,void * data)804 static int sensor_hub_finalize_pending_fn(struct device *dev, void *data)
805 {
806 struct hid_sensor_hub_device *hsdev = dev->platform_data;
807
808 if (hsdev->pending.status)
809 complete(&hsdev->pending.ready);
810
811 return 0;
812 }
813
sensor_hub_remove(struct hid_device * hdev)814 static void sensor_hub_remove(struct hid_device *hdev)
815 {
816 struct sensor_hub_data *data = hid_get_drvdata(hdev);
817 unsigned long flags;
818
819 hid_dbg(hdev, " hardware removed\n");
820 hid_hw_close(hdev);
821 hid_hw_stop(hdev);
822
823 spin_lock_irqsave(&data->lock, flags);
824 device_for_each_child(&hdev->dev, NULL,
825 sensor_hub_finalize_pending_fn);
826 spin_unlock_irqrestore(&data->lock, flags);
827
828 mfd_remove_devices(&hdev->dev);
829 mutex_destroy(&data->mutex);
830 }
831
832 static const struct hid_device_id sensor_hub_devices[] = {
833 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
834 HID_ANY_ID) },
835 { }
836 };
837 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
838
839 static struct hid_driver sensor_hub_driver = {
840 .name = "hid-sensor-hub",
841 .id_table = sensor_hub_devices,
842 .probe = sensor_hub_probe,
843 .remove = sensor_hub_remove,
844 .raw_event = sensor_hub_raw_event,
845 .report_fixup = sensor_hub_report_fixup,
846 .suspend = pm_ptr(sensor_hub_suspend),
847 .resume = pm_ptr(sensor_hub_resume),
848 .reset_resume = pm_ptr(sensor_hub_reset_resume),
849 };
850 module_hid_driver(sensor_hub_driver);
851
852 MODULE_DESCRIPTION("HID Sensor Hub driver");
853 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
854 MODULE_LICENSE("GPL");
855