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19#include <linux/device.h>
20#include <linux/hid.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/mfd/core.h>
24#include <linux/list.h>
25#include <linux/hid-sensor-ids.h>
26#include <linux/hid-sensor-hub.h>
27#include "hid-ids.h"
28
29
30
31
32
33
34
35
36
37
38struct sensor_hub_pending {
39 bool status;
40 struct completion ready;
41 u32 usage_id;
42 u32 attr_usage_id;
43 int raw_size;
44 u8 *raw_data;
45};
46
47
48
49
50
51
52
53
54
55
56
57
58struct sensor_hub_data {
59 struct hid_sensor_hub_device *hsdev;
60 struct mutex mutex;
61 spinlock_t lock;
62 struct sensor_hub_pending pending;
63 struct list_head dyn_callback_list;
64 spinlock_t dyn_callback_lock;
65 struct mfd_cell *hid_sensor_hub_client_devs;
66 int hid_sensor_client_cnt;
67};
68
69
70
71
72
73
74
75
76struct hid_sensor_hub_callbacks_list {
77 struct list_head list;
78 u32 usage_id;
79 struct hid_sensor_hub_callbacks *usage_callback;
80 void *priv;
81};
82
83static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
84 int dir)
85{
86 struct hid_report *report;
87
88 list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
89 if (report->id == id)
90 return report;
91 }
92 hid_warn(hdev, "No report with id 0x%x found\n", id);
93
94 return NULL;
95}
96
97static int sensor_hub_get_physical_device_count(
98 struct hid_report_enum *report_enum)
99{
100 struct hid_report *report;
101 struct hid_field *field;
102 int cnt = 0;
103
104 list_for_each_entry(report, &report_enum->report_list, list) {
105 field = report->field[0];
106 if (report->maxfield && field &&
107 field->physical)
108 cnt++;
109 }
110
111 return cnt;
112}
113
114static void sensor_hub_fill_attr_info(
115 struct hid_sensor_hub_attribute_info *info,
116 s32 index, s32 report_id, s32 units, s32 unit_expo, s32 size)
117{
118 info->index = index;
119 info->report_id = report_id;
120 info->units = units;
121 info->unit_expo = unit_expo;
122 info->size = size/8;
123}
124
125static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
126 struct hid_device *hdev,
127 u32 usage_id, void **priv)
128{
129 struct hid_sensor_hub_callbacks_list *callback;
130 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
131
132 spin_lock(&pdata->dyn_callback_lock);
133 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
134 if (callback->usage_id == usage_id) {
135 *priv = callback->priv;
136 spin_unlock(&pdata->dyn_callback_lock);
137 return callback->usage_callback;
138 }
139 spin_unlock(&pdata->dyn_callback_lock);
140
141 return NULL;
142}
143
144int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
145 u32 usage_id,
146 struct hid_sensor_hub_callbacks *usage_callback)
147{
148 struct hid_sensor_hub_callbacks_list *callback;
149 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
150
151 spin_lock(&pdata->dyn_callback_lock);
152 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
153 if (callback->usage_id == usage_id) {
154 spin_unlock(&pdata->dyn_callback_lock);
155 return -EINVAL;
156 }
157 callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
158 if (!callback) {
159 spin_unlock(&pdata->dyn_callback_lock);
160 return -ENOMEM;
161 }
162 callback->usage_callback = usage_callback;
163 callback->usage_id = usage_id;
164 callback->priv = NULL;
165 list_add_tail(&callback->list, &pdata->dyn_callback_list);
166 spin_unlock(&pdata->dyn_callback_lock);
167
168 return 0;
169}
170EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
171
172int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
173 u32 usage_id)
174{
175 struct hid_sensor_hub_callbacks_list *callback;
176 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
177
178 spin_lock(&pdata->dyn_callback_lock);
179 list_for_each_entry(callback, &pdata->dyn_callback_list, list)
180 if (callback->usage_id == usage_id) {
181 list_del(&callback->list);
182 kfree(callback);
183 break;
184 }
185 spin_unlock(&pdata->dyn_callback_lock);
186
187 return 0;
188}
189EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
190
191int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
192 u32 field_index, s32 value)
193{
194 struct hid_report *report;
195 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
196 int ret = 0;
197
198 mutex_lock(&data->mutex);
199 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
200 if (!report || (field_index >= report->maxfield)) {
201 ret = -EINVAL;
202 goto done_proc;
203 }
204 hid_set_field(report->field[field_index], 0, value);
205 hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
206 hid_hw_wait(hsdev->hdev);
207
208done_proc:
209 mutex_unlock(&data->mutex);
210
211 return ret;
212}
213EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
214
215int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
216 u32 field_index, s32 *value)
217{
218 struct hid_report *report;
219 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
220 int ret = 0;
221
222 mutex_lock(&data->mutex);
223 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
224 if (!report || (field_index >= report->maxfield)) {
225 ret = -EINVAL;
226 goto done_proc;
227 }
228 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
229 hid_hw_wait(hsdev->hdev);
230 *value = report->field[field_index]->value[0];
231
232done_proc:
233 mutex_unlock(&data->mutex);
234
235 return ret;
236}
237EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
238
239
240int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
241 u32 usage_id,
242 u32 attr_usage_id, u32 report_id)
243{
244 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
245 unsigned long flags;
246 struct hid_report *report;
247 int ret_val = 0;
248
249 mutex_lock(&data->mutex);
250 memset(&data->pending, 0, sizeof(data->pending));
251 init_completion(&data->pending.ready);
252 data->pending.usage_id = usage_id;
253 data->pending.attr_usage_id = attr_usage_id;
254 data->pending.raw_size = 0;
255
256 spin_lock_irqsave(&data->lock, flags);
257 data->pending.status = true;
258 report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
259 if (!report) {
260 spin_unlock_irqrestore(&data->lock, flags);
261 goto err_free;
262 }
263 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
264 spin_unlock_irqrestore(&data->lock, flags);
265 wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
266 switch (data->pending.raw_size) {
267 case 1:
268 ret_val = *(u8 *)data->pending.raw_data;
269 break;
270 case 2:
271 ret_val = *(u16 *)data->pending.raw_data;
272 break;
273 case 4:
274 ret_val = *(u32 *)data->pending.raw_data;
275 break;
276 default:
277 ret_val = 0;
278 }
279 kfree(data->pending.raw_data);
280
281err_free:
282 data->pending.status = false;
283 mutex_unlock(&data->mutex);
284
285 return ret_val;
286}
287EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
288
289int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
290 u8 type,
291 u32 usage_id,
292 u32 attr_usage_id,
293 struct hid_sensor_hub_attribute_info *info)
294{
295 int ret = -1;
296 int i, j;
297 int collection_index = -1;
298 struct hid_report *report;
299 struct hid_field *field;
300 struct hid_report_enum *report_enum;
301 struct hid_device *hdev = hsdev->hdev;
302
303
304 info->usage_id = usage_id;
305 info->attrib_id = attr_usage_id;
306 info->report_id = -1;
307 info->index = -1;
308 info->units = -1;
309 info->unit_expo = -1;
310
311 for (i = 0; i < hdev->maxcollection; ++i) {
312 struct hid_collection *collection = &hdev->collection[i];
313 if (usage_id == collection->usage) {
314 collection_index = i;
315 break;
316 }
317 }
318 if (collection_index == -1)
319 goto err_ret;
320
321 report_enum = &hdev->report_enum[type];
322 list_for_each_entry(report, &report_enum->report_list, list) {
323 for (i = 0; i < report->maxfield; ++i) {
324 field = report->field[i];
325 if (field->physical == usage_id &&
326 field->logical == attr_usage_id) {
327 sensor_hub_fill_attr_info(info, i, report->id,
328 field->unit, field->unit_exponent,
329 field->report_size);
330 ret = 0;
331 } else {
332 for (j = 0; j < field->maxusage; ++j) {
333 if (field->usage[j].hid ==
334 attr_usage_id &&
335 field->usage[j].collection_index ==
336 collection_index) {
337 sensor_hub_fill_attr_info(info,
338 i, report->id,
339 field->unit,
340 field->unit_exponent,
341 field->report_size);
342 ret = 0;
343 break;
344 }
345 }
346 }
347 if (ret == 0)
348 break;
349 }
350 }
351
352err_ret:
353 return ret;
354}
355EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
356
357#ifdef CONFIG_PM
358static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
359{
360 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
361 struct hid_sensor_hub_callbacks_list *callback;
362
363 hid_dbg(hdev, " sensor_hub_suspend\n");
364 spin_lock(&pdata->dyn_callback_lock);
365 list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
366 if (callback->usage_callback->suspend)
367 callback->usage_callback->suspend(
368 pdata->hsdev, callback->priv);
369 }
370 spin_unlock(&pdata->dyn_callback_lock);
371
372 return 0;
373}
374
375static int sensor_hub_resume(struct hid_device *hdev)
376{
377 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
378 struct hid_sensor_hub_callbacks_list *callback;
379
380 hid_dbg(hdev, " sensor_hub_resume\n");
381 spin_lock(&pdata->dyn_callback_lock);
382 list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
383 if (callback->usage_callback->resume)
384 callback->usage_callback->resume(
385 pdata->hsdev, callback->priv);
386 }
387 spin_unlock(&pdata->dyn_callback_lock);
388
389 return 0;
390}
391
392static int sensor_hub_reset_resume(struct hid_device *hdev)
393{
394 return 0;
395}
396#endif
397
398
399
400static int sensor_hub_raw_event(struct hid_device *hdev,
401 struct hid_report *report, u8 *raw_data, int size)
402{
403 int i;
404 u8 *ptr;
405 int sz;
406 struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
407 unsigned long flags;
408 struct hid_sensor_hub_callbacks *callback = NULL;
409 struct hid_collection *collection = NULL;
410 void *priv = NULL;
411
412 hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
413 report->id, size, report->type);
414 hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
415 if (report->type != HID_INPUT_REPORT)
416 return 1;
417
418 ptr = raw_data;
419 ptr++;
420
421 spin_lock_irqsave(&pdata->lock, flags);
422
423 for (i = 0; i < report->maxfield; ++i) {
424
425 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
426 i, report->field[i]->usage->collection_index,
427 report->field[i]->usage->hid,
428 report->field[i]->report_size/8);
429
430 sz = report->field[i]->report_size/8;
431 if (pdata->pending.status && pdata->pending.attr_usage_id ==
432 report->field[i]->usage->hid) {
433 hid_dbg(hdev, "data was pending ...\n");
434 pdata->pending.raw_data = kmalloc(sz, GFP_ATOMIC);
435 if (pdata->pending.raw_data) {
436 memcpy(pdata->pending.raw_data, ptr, sz);
437 pdata->pending.raw_size = sz;
438 } else
439 pdata->pending.raw_size = 0;
440 complete(&pdata->pending.ready);
441 }
442 collection = &hdev->collection[
443 report->field[i]->usage->collection_index];
444 hid_dbg(hdev, "collection->usage %x\n",
445 collection->usage);
446 callback = sensor_hub_get_callback(pdata->hsdev->hdev,
447 report->field[i]->physical,
448 &priv);
449 if (callback && callback->capture_sample) {
450 if (report->field[i]->logical)
451 callback->capture_sample(pdata->hsdev,
452 report->field[i]->logical, sz, ptr,
453 callback->pdev);
454 else
455 callback->capture_sample(pdata->hsdev,
456 report->field[i]->usage->hid, sz, ptr,
457 callback->pdev);
458 }
459 ptr += sz;
460 }
461 if (callback && collection && callback->send_event)
462 callback->send_event(pdata->hsdev, collection->usage,
463 callback->pdev);
464 spin_unlock_irqrestore(&pdata->lock, flags);
465
466 return 1;
467}
468
469static int sensor_hub_probe(struct hid_device *hdev,
470 const struct hid_device_id *id)
471{
472 int ret;
473 struct sensor_hub_data *sd;
474 int i;
475 char *name;
476 struct hid_report *report;
477 struct hid_report_enum *report_enum;
478 struct hid_field *field;
479 int dev_cnt;
480
481 sd = kzalloc(sizeof(struct sensor_hub_data), GFP_KERNEL);
482 if (!sd) {
483 hid_err(hdev, "cannot allocate Sensor data\n");
484 return -ENOMEM;
485 }
486 sd->hsdev = kzalloc(sizeof(struct hid_sensor_hub_device), GFP_KERNEL);
487 if (!sd->hsdev) {
488 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
489 ret = -ENOMEM;
490 goto err_free_hub;
491 }
492 hid_set_drvdata(hdev, sd);
493 sd->hsdev->hdev = hdev;
494 sd->hsdev->vendor_id = hdev->vendor;
495 sd->hsdev->product_id = hdev->product;
496 spin_lock_init(&sd->lock);
497 spin_lock_init(&sd->dyn_callback_lock);
498 mutex_init(&sd->mutex);
499 ret = hid_parse(hdev);
500 if (ret) {
501 hid_err(hdev, "parse failed\n");
502 goto err_free;
503 }
504 INIT_LIST_HEAD(&hdev->inputs);
505
506 ret = hid_hw_start(hdev, 0);
507 if (ret) {
508 hid_err(hdev, "hw start failed\n");
509 goto err_free;
510 }
511 ret = hid_hw_open(hdev);
512 if (ret) {
513 hid_err(hdev, "failed to open input interrupt pipe\n");
514 goto err_stop_hw;
515 }
516
517 INIT_LIST_HEAD(&sd->dyn_callback_list);
518 sd->hid_sensor_client_cnt = 0;
519 report_enum = &hdev->report_enum[HID_INPUT_REPORT];
520
521 dev_cnt = sensor_hub_get_physical_device_count(report_enum);
522 if (dev_cnt > HID_MAX_PHY_DEVICES) {
523 hid_err(hdev, "Invalid Physical device count\n");
524 ret = -EINVAL;
525 goto err_close;
526 }
527 sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
528 sizeof(struct mfd_cell),
529 GFP_KERNEL);
530 if (sd->hid_sensor_hub_client_devs == NULL) {
531 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
532 ret = -ENOMEM;
533 goto err_close;
534 }
535 list_for_each_entry(report, &report_enum->report_list, list) {
536 hid_dbg(hdev, "Report id:%x\n", report->id);
537 field = report->field[0];
538 if (report->maxfield && field &&
539 field->physical) {
540 name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
541 field->physical);
542 if (name == NULL) {
543 hid_err(hdev, "Failed MFD device name\n");
544 ret = -ENOMEM;
545 goto err_free_names;
546 }
547 sd->hid_sensor_hub_client_devs[
548 sd->hid_sensor_client_cnt].name = name;
549 sd->hid_sensor_hub_client_devs[
550 sd->hid_sensor_client_cnt].platform_data =
551 sd->hsdev;
552 sd->hid_sensor_hub_client_devs[
553 sd->hid_sensor_client_cnt].pdata_size =
554 sizeof(*sd->hsdev);
555 hid_dbg(hdev, "Adding %s:%p\n", name, sd);
556 sd->hid_sensor_client_cnt++;
557 }
558 }
559 ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
560 sd->hid_sensor_client_cnt, NULL, 0, NULL);
561 if (ret < 0)
562 goto err_free_names;
563
564 return ret;
565
566err_free_names:
567 for (i = 0; i < sd->hid_sensor_client_cnt ; ++i)
568 kfree(sd->hid_sensor_hub_client_devs[i].name);
569 kfree(sd->hid_sensor_hub_client_devs);
570err_close:
571 hid_hw_close(hdev);
572err_stop_hw:
573 hid_hw_stop(hdev);
574err_free:
575 kfree(sd->hsdev);
576err_free_hub:
577 kfree(sd);
578
579 return ret;
580}
581
582static void sensor_hub_remove(struct hid_device *hdev)
583{
584 struct sensor_hub_data *data = hid_get_drvdata(hdev);
585 unsigned long flags;
586 int i;
587
588 hid_dbg(hdev, " hardware removed\n");
589 hid_hw_close(hdev);
590 hid_hw_stop(hdev);
591 spin_lock_irqsave(&data->lock, flags);
592 if (data->pending.status)
593 complete(&data->pending.ready);
594 spin_unlock_irqrestore(&data->lock, flags);
595 mfd_remove_devices(&hdev->dev);
596 for (i = 0; i < data->hid_sensor_client_cnt ; ++i)
597 kfree(data->hid_sensor_hub_client_devs[i].name);
598 kfree(data->hid_sensor_hub_client_devs);
599 hid_set_drvdata(hdev, NULL);
600 mutex_destroy(&data->mutex);
601 kfree(data->hsdev);
602 kfree(data);
603}
604
605static const struct hid_device_id sensor_hub_devices[] = {
606 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
607 HID_ANY_ID) },
608 { }
609};
610MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
611
612static struct hid_driver sensor_hub_driver = {
613 .name = "hid-sensor-hub",
614 .id_table = sensor_hub_devices,
615 .probe = sensor_hub_probe,
616 .remove = sensor_hub_remove,
617 .raw_event = sensor_hub_raw_event,
618#ifdef CONFIG_PM
619 .suspend = sensor_hub_suspend,
620 .resume = sensor_hub_resume,
621 .reset_resume = sensor_hub_reset_resume,
622#endif
623};
624module_hid_driver(sensor_hub_driver);
625
626MODULE_DESCRIPTION("HID Sensor Hub driver");
627MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
628MODULE_LICENSE("GPL");
629
