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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 */
29struct 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 */
47struct 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
55static 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
69static 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
84static 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
97static 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
127int 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(sizeof(*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}
167EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
168
169int 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}
188EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
189
190int 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
231done_proc:
232 mutex_unlock(&data->mutex);
233
234 return ret;
235}
236EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
237
238int 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 sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
243 int report_size;
244 int ret = 0;
245 u8 *val_ptr;
246 int buffer_index = 0;
247 int i;
248
249 memset(buffer, 0, buffer_size);
250
251 mutex_lock(&data->mutex);
252 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
253 if (!report || (field_index >= report->maxfield) ||
254 report->field[field_index]->report_count < 1) {
255 ret = -EINVAL;
256 goto done_proc;
257 }
258 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
259 hid_hw_wait(hsdev->hdev);
260
261 /* calculate number of bytes required to read this field */
262 report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
263 8) *
264 report->field[field_index]->report_count;
265 if (!report_size) {
266 ret = -EINVAL;
267 goto done_proc;
268 }
269 ret = min(report_size, buffer_size);
270
271 val_ptr = (u8 *)report->field[field_index]->value;
272 for (i = 0; i < report->field[field_index]->report_count; ++i) {
273 if (buffer_index >= ret)
274 break;
275
276 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
277 report->field[field_index]->report_size / 8);
278 val_ptr += sizeof(__s32);
279 buffer_index += (report->field[field_index]->report_size / 8);
280 }
281
282done_proc:
283 mutex_unlock(&data->mutex);
284
285 return ret;
286}
287EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
288
289
290int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
291 u32 usage_id,
292 u32 attr_usage_id, u32 report_id,
293 enum sensor_hub_read_flags flag,
294 bool is_signed)
295{
296 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
297 unsigned long flags;
298 struct hid_report *report;
299 int ret_val = 0;
300
301 report = sensor_hub_report(report_id, hsdev->hdev,
302 HID_INPUT_REPORT);
303 if (!report)
304 return -EINVAL;
305
306 mutex_lock(hsdev->mutex_ptr);
307 if (flag == SENSOR_HUB_SYNC) {
308 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
309 init_completion(&hsdev->pending.ready);
310 hsdev->pending.usage_id = usage_id;
311 hsdev->pending.attr_usage_id = attr_usage_id;
312 hsdev->pending.raw_size = 0;
313
314 spin_lock_irqsave(&data->lock, flags);
315 hsdev->pending.status = true;
316 spin_unlock_irqrestore(&data->lock, flags);
317 }
318 mutex_lock(&data->mutex);
319 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
320 mutex_unlock(&data->mutex);
321 if (flag == SENSOR_HUB_SYNC) {
322 wait_for_completion_interruptible_timeout(
323 &hsdev->pending.ready, HZ*5);
324 switch (hsdev->pending.raw_size) {
325 case 1:
326 if (is_signed)
327 ret_val = *(s8 *)hsdev->pending.raw_data;
328 else
329 ret_val = *(u8 *)hsdev->pending.raw_data;
330 break;
331 case 2:
332 if (is_signed)
333 ret_val = *(s16 *)hsdev->pending.raw_data;
334 else
335 ret_val = *(u16 *)hsdev->pending.raw_data;
336 break;
337 case 4:
338 ret_val = *(u32 *)hsdev->pending.raw_data;
339 break;
340 default:
341 ret_val = 0;
342 }
343 kfree(hsdev->pending.raw_data);
344 hsdev->pending.status = false;
345 }
346 mutex_unlock(hsdev->mutex_ptr);
347
348 return ret_val;
349}
350EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
351
352int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
353 u32 report_id, int field_index, u32 usage_id)
354{
355 struct hid_report *report;
356 struct hid_field *field;
357 int i;
358
359 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
360 if (!report || (field_index >= report->maxfield))
361 goto done_proc;
362
363 field = report->field[field_index];
364 for (i = 0; i < field->maxusage; ++i) {
365 if (field->usage[i].hid == usage_id)
366 return field->usage[i].usage_index;
367 }
368
369done_proc:
370 return -EINVAL;
371}
372EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
373
374int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
375 u8 type,
376 u32 usage_id,
377 u32 attr_usage_id,
378 struct hid_sensor_hub_attribute_info *info)
379{
380 int ret = -1;
381 int i;
382 struct hid_report *report;
383 struct hid_field *field;
384 struct hid_report_enum *report_enum;
385 struct hid_device *hdev = hsdev->hdev;
386
387 /* Initialize with defaults */
388 info->usage_id = usage_id;
389 info->attrib_id = attr_usage_id;
390 info->report_id = -1;
391 info->index = -1;
392 info->units = -1;
393 info->unit_expo = -1;
394
395 report_enum = &hdev->report_enum[type];
396 list_for_each_entry(report, &report_enum->report_list, list) {
397 for (i = 0; i < report->maxfield; ++i) {
398 field = report->field[i];
399 if (field->maxusage) {
400 if ((field->physical == usage_id ||
401 field->application == 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}
423EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
424
425#ifdef CONFIG_PM
426static 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
444static 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
462static 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 */
471static 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 if (report->id)
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 ? report->field[i]->physical :
511 report->field[i]->application,
512 report->field[i]->usage[0].collection_index,
513 &hsdev, &priv);
514 if (!callback) {
515 ptr += sz;
516 continue;
517 }
518 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
519 report->field[i]->usage->hid ||
520 hsdev->pending.attr_usage_id ==
521 report->field[i]->logical)) {
522 hid_dbg(hdev, "data was pending ...\n");
523 hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
524 if (hsdev->pending.raw_data)
525 hsdev->pending.raw_size = sz;
526 else
527 hsdev->pending.raw_size = 0;
528 complete(&hsdev->pending.ready);
529 }
530 if (callback->capture_sample) {
531 if (report->field[i]->logical)
532 callback->capture_sample(hsdev,
533 report->field[i]->logical, sz, ptr,
534 callback->pdev);
535 else
536 callback->capture_sample(hsdev,
537 report->field[i]->usage->hid, sz, ptr,
538 callback->pdev);
539 }
540 ptr += sz;
541 }
542 if (callback && collection && callback->send_event)
543 callback->send_event(hsdev, collection->usage,
544 callback->pdev);
545 spin_unlock_irqrestore(&pdata->lock, flags);
546
547 return 1;
548}
549
550int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
551{
552 int ret = 0;
553 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
554
555 mutex_lock(&data->mutex);
556 if (!data->ref_cnt) {
557 ret = hid_hw_open(hsdev->hdev);
558 if (ret) {
559 hid_err(hsdev->hdev, "failed to open hid device\n");
560 mutex_unlock(&data->mutex);
561 return ret;
562 }
563 }
564 data->ref_cnt++;
565 mutex_unlock(&data->mutex);
566
567 return ret;
568}
569EXPORT_SYMBOL_GPL(sensor_hub_device_open);
570
571void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
572{
573 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
574
575 mutex_lock(&data->mutex);
576 data->ref_cnt--;
577 if (!data->ref_cnt)
578 hid_hw_close(hsdev->hdev);
579 mutex_unlock(&data->mutex);
580}
581EXPORT_SYMBOL_GPL(sensor_hub_device_close);
582
583static const __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
584 unsigned int *rsize)
585{
586 /*
587 * Checks if the report descriptor of Thinkpad Helix 2 has a logical
588 * minimum for magnetic flux axis greater than the maximum.
589 */
590 if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
591 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
592 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
593 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
594 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
595 /* Sets negative logical minimum for mag x, y and z */
596 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
597 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
598 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
599 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
600 }
601
602 return rdesc;
603}
604
605static int sensor_hub_probe(struct hid_device *hdev,
606 const struct hid_device_id *id)
607{
608 int ret;
609 struct sensor_hub_data *sd;
610 int i;
611 char *name;
612 int dev_cnt;
613 struct hid_sensor_hub_device *hsdev;
614 struct hid_sensor_hub_device *last_hsdev = NULL;
615 struct hid_sensor_hub_device *collection_hsdev = NULL;
616
617 sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
618 if (!sd) {
619 hid_err(hdev, "cannot allocate Sensor data\n");
620 return -ENOMEM;
621 }
622
623 hid_set_drvdata(hdev, sd);
624
625 spin_lock_init(&sd->lock);
626 spin_lock_init(&sd->dyn_callback_lock);
627 mutex_init(&sd->mutex);
628 ret = hid_parse(hdev);
629 if (ret) {
630 hid_err(hdev, "parse failed\n");
631 return ret;
632 }
633 INIT_LIST_HEAD(&hdev->inputs);
634
635 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT | HID_CONNECT_DRIVER);
636 if (ret) {
637 hid_err(hdev, "hw start failed\n");
638 return ret;
639 }
640 INIT_LIST_HEAD(&sd->dyn_callback_list);
641 sd->hid_sensor_client_cnt = 0;
642
643 dev_cnt = sensor_hub_get_physical_device_count(hdev);
644 if (dev_cnt > HID_MAX_PHY_DEVICES) {
645 hid_err(hdev, "Invalid Physical device count\n");
646 ret = -EINVAL;
647 goto err_stop_hw;
648 }
649 sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
650 dev_cnt,
651 sizeof(struct mfd_cell),
652 GFP_KERNEL);
653 if (sd->hid_sensor_hub_client_devs == NULL) {
654 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
655 ret = -ENOMEM;
656 goto err_stop_hw;
657 }
658
659 for (i = 0; i < hdev->maxcollection; ++i) {
660 struct hid_collection *collection = &hdev->collection[i];
661
662 if (collection->type == HID_COLLECTION_PHYSICAL ||
663 collection->type == HID_COLLECTION_APPLICATION) {
664
665 hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
666 GFP_KERNEL);
667 if (!hsdev) {
668 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
669 ret = -ENOMEM;
670 goto err_stop_hw;
671 }
672 hsdev->hdev = hdev;
673 hsdev->vendor_id = hdev->vendor;
674 hsdev->product_id = hdev->product;
675 hsdev->usage = collection->usage;
676 hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
677 sizeof(struct mutex),
678 GFP_KERNEL);
679 if (!hsdev->mutex_ptr) {
680 ret = -ENOMEM;
681 goto err_stop_hw;
682 }
683 mutex_init(hsdev->mutex_ptr);
684 hsdev->start_collection_index = i;
685 if (last_hsdev)
686 last_hsdev->end_collection_index = i;
687 last_hsdev = hsdev;
688 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
689 "HID-SENSOR-%x",
690 collection->usage);
691 if (name == NULL) {
692 hid_err(hdev, "Failed MFD device name\n");
693 ret = -ENOMEM;
694 goto err_stop_hw;
695 }
696 sd->hid_sensor_hub_client_devs[
697 sd->hid_sensor_client_cnt].name = name;
698 sd->hid_sensor_hub_client_devs[
699 sd->hid_sensor_client_cnt].platform_data =
700 hsdev;
701 sd->hid_sensor_hub_client_devs[
702 sd->hid_sensor_client_cnt].pdata_size =
703 sizeof(*hsdev);
704 hid_dbg(hdev, "Adding %s:%d\n", name,
705 hsdev->start_collection_index);
706 sd->hid_sensor_client_cnt++;
707 if (collection_hsdev)
708 collection_hsdev->end_collection_index = i;
709 if (collection->type == HID_COLLECTION_APPLICATION &&
710 collection->usage == HID_USAGE_SENSOR_COLLECTION)
711 collection_hsdev = hsdev;
712 }
713 }
714 if (last_hsdev)
715 last_hsdev->end_collection_index = i;
716 if (collection_hsdev)
717 collection_hsdev->end_collection_index = i;
718
719 ret = mfd_add_hotplug_devices(&hdev->dev,
720 sd->hid_sensor_hub_client_devs,
721 sd->hid_sensor_client_cnt);
722 if (ret < 0)
723 goto err_stop_hw;
724
725 return ret;
726
727err_stop_hw:
728 hid_hw_stop(hdev);
729
730 return ret;
731}
732
733static int sensor_hub_finalize_pending_fn(struct device *dev, void *data)
734{
735 struct hid_sensor_hub_device *hsdev = dev->platform_data;
736
737 if (hsdev->pending.status)
738 complete(&hsdev->pending.ready);
739
740 return 0;
741}
742
743static void sensor_hub_remove(struct hid_device *hdev)
744{
745 struct sensor_hub_data *data = hid_get_drvdata(hdev);
746 unsigned long flags;
747
748 hid_dbg(hdev, " hardware removed\n");
749 hid_hw_close(hdev);
750 hid_hw_stop(hdev);
751
752 spin_lock_irqsave(&data->lock, flags);
753 device_for_each_child(&hdev->dev, NULL,
754 sensor_hub_finalize_pending_fn);
755 spin_unlock_irqrestore(&data->lock, flags);
756
757 mfd_remove_devices(&hdev->dev);
758 mutex_destroy(&data->mutex);
759}
760
761static const struct hid_device_id sensor_hub_devices[] = {
762 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
763 HID_ANY_ID) },
764 { }
765};
766MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
767
768static struct hid_driver sensor_hub_driver = {
769 .name = "hid-sensor-hub",
770 .id_table = sensor_hub_devices,
771 .probe = sensor_hub_probe,
772 .remove = sensor_hub_remove,
773 .raw_event = sensor_hub_raw_event,
774 .report_fixup = sensor_hub_report_fixup,
775#ifdef CONFIG_PM
776 .suspend = sensor_hub_suspend,
777 .resume = sensor_hub_resume,
778 .reset_resume = sensor_hub_reset_resume,
779#endif
780};
781module_hid_driver(sensor_hub_driver);
782
783MODULE_DESCRIPTION("HID Sensor Hub driver");
784MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
785MODULE_LICENSE("GPL");
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 */
43struct 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 */
61struct 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
69static 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
83static 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
98static 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
111static 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
141int 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}
181EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
182
183int 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}
202EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
203
204int 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
240done_proc:
241 mutex_unlock(&data->mutex);
242
243 return ret;
244}
245EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
246
247int 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
291done_proc:
292 mutex_unlock(&data->mutex);
293
294 return ret;
295}
296EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
297
298
299int 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}
352EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
353
354int 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
371done_proc:
372 return -EINVAL;
373}
374EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
375
376int 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}
424EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
425
426#ifdef CONFIG_PM
427static 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
445static 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
463static 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 */
472static 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
549int 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}
568EXPORT_SYMBOL_GPL(sensor_hub_device_open);
569
570void 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}
580EXPORT_SYMBOL_GPL(sensor_hub_device_close);
581
582static int sensor_hub_probe(struct hid_device *hdev,
583 const struct hid_device_id *id)
584{
585 int ret;
586 struct sensor_hub_data *sd;
587 int i;
588 char *name;
589 int dev_cnt;
590 struct hid_sensor_hub_device *hsdev;
591 struct hid_sensor_hub_device *last_hsdev = NULL;
592 struct hid_sensor_hub_device *collection_hsdev = NULL;
593
594 sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
595 if (!sd) {
596 hid_err(hdev, "cannot allocate Sensor data\n");
597 return -ENOMEM;
598 }
599
600 hid_set_drvdata(hdev, sd);
601 sd->quirks = id->driver_data;
602
603 spin_lock_init(&sd->lock);
604 spin_lock_init(&sd->dyn_callback_lock);
605 mutex_init(&sd->mutex);
606 ret = hid_parse(hdev);
607 if (ret) {
608 hid_err(hdev, "parse failed\n");
609 return ret;
610 }
611 INIT_LIST_HEAD(&hdev->inputs);
612
613 ret = hid_hw_start(hdev, 0);
614 if (ret) {
615 hid_err(hdev, "hw start failed\n");
616 return ret;
617 }
618 INIT_LIST_HEAD(&sd->dyn_callback_list);
619 sd->hid_sensor_client_cnt = 0;
620
621 dev_cnt = sensor_hub_get_physical_device_count(hdev);
622 if (dev_cnt > HID_MAX_PHY_DEVICES) {
623 hid_err(hdev, "Invalid Physical device count\n");
624 ret = -EINVAL;
625 goto err_stop_hw;
626 }
627 sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
628 sizeof(struct mfd_cell),
629 GFP_KERNEL);
630 if (sd->hid_sensor_hub_client_devs == NULL) {
631 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
632 ret = -ENOMEM;
633 goto err_stop_hw;
634 }
635
636 for (i = 0; i < hdev->maxcollection; ++i) {
637 struct hid_collection *collection = &hdev->collection[i];
638
639 if (collection->type == HID_COLLECTION_PHYSICAL ||
640 collection->type == HID_COLLECTION_APPLICATION) {
641
642 hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
643 GFP_KERNEL);
644 if (!hsdev) {
645 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
646 ret = -ENOMEM;
647 goto err_stop_hw;
648 }
649 hsdev->hdev = hdev;
650 hsdev->vendor_id = hdev->vendor;
651 hsdev->product_id = hdev->product;
652 hsdev->usage = collection->usage;
653 hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
654 sizeof(struct mutex),
655 GFP_KERNEL);
656 if (!hsdev->mutex_ptr) {
657 ret = -ENOMEM;
658 goto err_stop_hw;
659 }
660 mutex_init(hsdev->mutex_ptr);
661 hsdev->start_collection_index = i;
662 if (last_hsdev)
663 last_hsdev->end_collection_index = i;
664 last_hsdev = hsdev;
665 name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
666 "HID-SENSOR-%x",
667 collection->usage);
668 if (name == NULL) {
669 hid_err(hdev, "Failed MFD device name\n");
670 ret = -ENOMEM;
671 goto err_stop_hw;
672 }
673 sd->hid_sensor_hub_client_devs[
674 sd->hid_sensor_client_cnt].name = name;
675 sd->hid_sensor_hub_client_devs[
676 sd->hid_sensor_client_cnt].platform_data =
677 hsdev;
678 sd->hid_sensor_hub_client_devs[
679 sd->hid_sensor_client_cnt].pdata_size =
680 sizeof(*hsdev);
681 hid_dbg(hdev, "Adding %s:%d\n", name,
682 hsdev->start_collection_index);
683 sd->hid_sensor_client_cnt++;
684 if (collection_hsdev)
685 collection_hsdev->end_collection_index = i;
686 if (collection->type == HID_COLLECTION_APPLICATION &&
687 collection->usage == HID_USAGE_SENSOR_COLLECTION)
688 collection_hsdev = hsdev;
689 }
690 }
691 if (last_hsdev)
692 last_hsdev->end_collection_index = i;
693 if (collection_hsdev)
694 collection_hsdev->end_collection_index = i;
695
696 ret = mfd_add_hotplug_devices(&hdev->dev,
697 sd->hid_sensor_hub_client_devs,
698 sd->hid_sensor_client_cnt);
699 if (ret < 0)
700 goto err_stop_hw;
701
702 return ret;
703
704err_stop_hw:
705 hid_hw_stop(hdev);
706
707 return ret;
708}
709
710static void sensor_hub_remove(struct hid_device *hdev)
711{
712 struct sensor_hub_data *data = hid_get_drvdata(hdev);
713 unsigned long flags;
714 int i;
715
716 hid_dbg(hdev, " hardware removed\n");
717 hid_hw_close(hdev);
718 hid_hw_stop(hdev);
719 spin_lock_irqsave(&data->lock, flags);
720 for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
721 struct hid_sensor_hub_device *hsdev =
722 data->hid_sensor_hub_client_devs[i].platform_data;
723 if (hsdev->pending.status)
724 complete(&hsdev->pending.ready);
725 }
726 spin_unlock_irqrestore(&data->lock, flags);
727 mfd_remove_devices(&hdev->dev);
728 hid_set_drvdata(hdev, NULL);
729 mutex_destroy(&data->mutex);
730}
731
732static const struct hid_device_id sensor_hub_devices[] = {
733 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
734 HID_ANY_ID) },
735 { }
736};
737MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
738
739static struct hid_driver sensor_hub_driver = {
740 .name = "hid-sensor-hub",
741 .id_table = sensor_hub_devices,
742 .probe = sensor_hub_probe,
743 .remove = sensor_hub_remove,
744 .raw_event = sensor_hub_raw_event,
745#ifdef CONFIG_PM
746 .suspend = sensor_hub_suspend,
747 .resume = sensor_hub_resume,
748 .reset_resume = sensor_hub_reset_resume,
749#endif
750};
751module_hid_driver(sensor_hub_driver);
752
753MODULE_DESCRIPTION("HID Sensor Hub driver");
754MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
755MODULE_LICENSE("GPL");