1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * hid-sensor-custom.c
4 * Copyright (c) 2015, Intel Corporation.
5 */
6
7#include <linux/ctype.h>
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/miscdevice.h>
12#include <linux/kfifo.h>
13#include <linux/sched.h>
14#include <linux/wait.h>
15#include <linux/poll.h>
16#include <linux/bsearch.h>
17#include <linux/platform_device.h>
18#include <linux/hid-sensor-hub.h>
19
20#define HID_CUSTOM_NAME_LENGTH 64
21#define HID_CUSTOM_MAX_CORE_ATTRS 10
22#define HID_CUSTOM_TOTAL_ATTRS (HID_CUSTOM_MAX_CORE_ATTRS + 1)
23#define HID_CUSTOM_FIFO_SIZE 4096
24#define HID_CUSTOM_MAX_FEATURE_BYTES 64
25#define HID_SENSOR_USAGE_LENGTH (4 + 1)
26
27struct hid_sensor_custom_field {
28 int report_id;
29 char group_name[HID_CUSTOM_NAME_LENGTH];
30 struct hid_sensor_hub_attribute_info attribute;
31 struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS];
32 char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH];
33 struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS];
34 struct attribute_group hid_custom_attribute_group;
35};
36
37struct hid_sensor_custom {
38 struct mutex mutex;
39 struct platform_device *pdev;
40 struct hid_sensor_hub_device *hsdev;
41 struct hid_sensor_hub_callbacks callbacks;
42 int sensor_field_count;
43 struct hid_sensor_custom_field *fields;
44 int input_field_count;
45 int input_report_size;
46 int input_report_recd_size;
47 bool input_skip_sample;
48 bool enable;
49 struct hid_sensor_custom_field *power_state;
50 struct hid_sensor_custom_field *report_state;
51 struct miscdevice custom_dev;
52 struct kfifo data_fifo;
53 unsigned long misc_opened;
54 wait_queue_head_t wait;
55 struct platform_device *custom_pdev;
56};
57
58/* Header for each sample to user space via dev interface */
59struct hid_sensor_sample {
60 u32 usage_id;
61 u64 timestamp;
62 u32 raw_len;
63} __packed;
64
65static struct attribute hid_custom_attrs[] = {
66 {.name = "name", .mode = S_IRUGO},
67 {.name = "units", .mode = S_IRUGO},
68 {.name = "unit-expo", .mode = S_IRUGO},
69 {.name = "minimum", .mode = S_IRUGO},
70 {.name = "maximum", .mode = S_IRUGO},
71 {.name = "size", .mode = S_IRUGO},
72 {.name = "value", .mode = S_IWUSR | S_IRUGO},
73 {.name = NULL}
74};
75
76static const struct hid_custom_usage_desc {
77 int usage_id;
78 char *desc;
79} hid_custom_usage_desc_table[] = {
80 {0x200201, "event-sensor-state"},
81 {0x200202, "event-sensor-event"},
82 {0x200301, "property-friendly-name"},
83 {0x200302, "property-persistent-unique-id"},
84 {0x200303, "property-sensor-status"},
85 {0x200304, "property-min-report-interval"},
86 {0x200305, "property-sensor-manufacturer"},
87 {0x200306, "property-sensor-model"},
88 {0x200307, "property-sensor-serial-number"},
89 {0x200308, "property-sensor-description"},
90 {0x200309, "property-sensor-connection-type"},
91 {0x20030A, "property-sensor-device-path"},
92 {0x20030B, "property-hardware-revision"},
93 {0x20030C, "property-firmware-version"},
94 {0x20030D, "property-release-date"},
95 {0x20030E, "property-report-interval"},
96 {0x20030F, "property-change-sensitivity-absolute"},
97 {0x200310, "property-change-sensitivity-percent-range"},
98 {0x200311, "property-change-sensitivity-percent-relative"},
99 {0x200312, "property-accuracy"},
100 {0x200313, "property-resolution"},
101 {0x200314, "property-maximum"},
102 {0x200315, "property-minimum"},
103 {0x200316, "property-reporting-state"},
104 {0x200317, "property-sampling-rate"},
105 {0x200318, "property-response-curve"},
106 {0x200319, "property-power-state"},
107 {0x200540, "data-field-custom"},
108 {0x200541, "data-field-custom-usage"},
109 {0x200542, "data-field-custom-boolean-array"},
110 {0x200543, "data-field-custom-value"},
111 {0x200544, "data-field-custom-value_1"},
112 {0x200545, "data-field-custom-value_2"},
113 {0x200546, "data-field-custom-value_3"},
114 {0x200547, "data-field-custom-value_4"},
115 {0x200548, "data-field-custom-value_5"},
116 {0x200549, "data-field-custom-value_6"},
117 {0x20054A, "data-field-custom-value_7"},
118 {0x20054B, "data-field-custom-value_8"},
119 {0x20054C, "data-field-custom-value_9"},
120 {0x20054D, "data-field-custom-value_10"},
121 {0x20054E, "data-field-custom-value_11"},
122 {0x20054F, "data-field-custom-value_12"},
123 {0x200550, "data-field-custom-value_13"},
124 {0x200551, "data-field-custom-value_14"},
125 {0x200552, "data-field-custom-value_15"},
126 {0x200553, "data-field-custom-value_16"},
127 {0x200554, "data-field-custom-value_17"},
128 {0x200555, "data-field-custom-value_18"},
129 {0x200556, "data-field-custom-value_19"},
130 {0x200557, "data-field-custom-value_20"},
131 {0x200558, "data-field-custom-value_21"},
132 {0x200559, "data-field-custom-value_22"},
133 {0x20055A, "data-field-custom-value_23"},
134 {0x20055B, "data-field-custom-value_24"},
135 {0x20055C, "data-field-custom-value_25"},
136 {0x20055D, "data-field-custom-value_26"},
137 {0x20055E, "data-field-custom-value_27"},
138 {0x20055F, "data-field-custom-value_28"},
139};
140
141static int usage_id_cmp(const void *p1, const void *p2)
142{
143 if (*(int *)p1 < *(int *)p2)
144 return -1;
145
146 if (*(int *)p1 > *(int *)p2)
147 return 1;
148
149 return 0;
150}
151
152static ssize_t enable_sensor_show(struct device *dev,
153 struct device_attribute *attr, char *buf)
154{
155 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
156
157 return sprintf(buf, "%d\n", sensor_inst->enable);
158}
159
160static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
161 bool state)
162{
163 int power_val = -1;
164 int report_val = -1;
165 u32 power_state_usage_id;
166 u32 report_state_usage_id;
167 int ret;
168
169 /*
170 * It is possible that the power/report state ids are not present.
171 * In this case this function will return success. But if the
172 * ids are present, then it will return error if set fails.
173 */
174 if (state) {
175 power_state_usage_id =
176 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
177 report_state_usage_id =
178 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
179 } else {
180 power_state_usage_id =
181 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
182 report_state_usage_id =
183 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
184 }
185
186 if (sensor_inst->power_state)
187 power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
188 sensor_inst->power_state->attribute.report_id,
189 sensor_inst->power_state->attribute.index,
190 power_state_usage_id);
191 if (sensor_inst->report_state)
192 report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
193 sensor_inst->report_state->attribute.report_id,
194 sensor_inst->report_state->attribute.index,
195 report_state_usage_id);
196
197 if (power_val >= 0) {
198 power_val +=
199 sensor_inst->power_state->attribute.logical_minimum;
200 ret = sensor_hub_set_feature(sensor_inst->hsdev,
201 sensor_inst->power_state->attribute.report_id,
202 sensor_inst->power_state->attribute.index,
203 sizeof(power_val),
204 &power_val);
205 if (ret) {
206 hid_err(sensor_inst->hsdev->hdev,
207 "Set power state failed\n");
208 return ret;
209 }
210 }
211
212 if (report_val >= 0) {
213 report_val +=
214 sensor_inst->report_state->attribute.logical_minimum;
215 ret = sensor_hub_set_feature(sensor_inst->hsdev,
216 sensor_inst->report_state->attribute.report_id,
217 sensor_inst->report_state->attribute.index,
218 sizeof(report_val),
219 &report_val);
220 if (ret) {
221 hid_err(sensor_inst->hsdev->hdev,
222 "Set report state failed\n");
223 return ret;
224 }
225 }
226
227 return 0;
228}
229
230static ssize_t enable_sensor_store(struct device *dev,
231 struct device_attribute *attr,
232 const char *buf, size_t count)
233{
234 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
235 int value;
236 int ret = -EINVAL;
237
238 if (kstrtoint(buf, 0, &value) != 0)
239 return -EINVAL;
240
241 mutex_lock(&sensor_inst->mutex);
242 if (value && !sensor_inst->enable) {
243 ret = sensor_hub_device_open(sensor_inst->hsdev);
244 if (ret)
245 goto unlock_state;
246
247 ret = set_power_report_state(sensor_inst, true);
248 if (ret) {
249 sensor_hub_device_close(sensor_inst->hsdev);
250 goto unlock_state;
251 }
252 sensor_inst->enable = true;
253 } else if (!value && sensor_inst->enable) {
254 ret = set_power_report_state(sensor_inst, false);
255 sensor_hub_device_close(sensor_inst->hsdev);
256 sensor_inst->enable = false;
257 }
258unlock_state:
259 mutex_unlock(&sensor_inst->mutex);
260 if (ret < 0)
261 return ret;
262
263 return count;
264}
265static DEVICE_ATTR_RW(enable_sensor);
266
267static struct attribute *enable_sensor_attrs[] = {
268 &dev_attr_enable_sensor.attr,
269 NULL,
270};
271
272static const struct attribute_group enable_sensor_attr_group = {
273 .attrs = enable_sensor_attrs,
274};
275
276static ssize_t show_value(struct device *dev, struct device_attribute *attr,
277 char *buf)
278{
279 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
280 struct hid_sensor_hub_attribute_info *attribute;
281 int index, usage, field_index;
282 char name[HID_CUSTOM_NAME_LENGTH];
283 bool feature = false;
284 bool input = false;
285 int value = 0;
286
287 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
288 name) == 3) {
289 feature = true;
290 field_index = index + sensor_inst->input_field_count;
291 } else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
292 name) == 3) {
293 input = true;
294 field_index = index;
295 } else
296 return -EINVAL;
297
298 if (!strncmp(name, "value", strlen("value"))) {
299 u32 report_id;
300 int ret;
301
302 attribute = &sensor_inst->fields[field_index].attribute;
303 report_id = attribute->report_id;
304 if (feature) {
305 u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
306 int len = 0;
307 u64 value = 0;
308 int i = 0;
309
310 ret = sensor_hub_get_feature(sensor_inst->hsdev,
311 report_id,
312 index,
313 sizeof(values), values);
314 if (ret < 0)
315 return ret;
316
317 while (i < ret) {
318 if (i + attribute->size > ret) {
319 len += scnprintf(&buf[len],
320 PAGE_SIZE - len,
321 "%d ", values[i]);
322 break;
323 }
324 switch (attribute->size) {
325 case 2:
326 value = (u64) *(u16 *)&values[i];
327 i += attribute->size;
328 break;
329 case 4:
330 value = (u64) *(u32 *)&values[i];
331 i += attribute->size;
332 break;
333 case 8:
334 value = *(u64 *)&values[i];
335 i += attribute->size;
336 break;
337 default:
338 value = (u64) values[i];
339 ++i;
340 break;
341 }
342 len += scnprintf(&buf[len], PAGE_SIZE - len,
343 "%lld ", value);
344 }
345 len += scnprintf(&buf[len], PAGE_SIZE - len, "\n");
346
347 return len;
348 } else if (input)
349 value = sensor_hub_input_attr_get_raw_value(
350 sensor_inst->hsdev,
351 sensor_inst->hsdev->usage,
352 usage, report_id,
353 SENSOR_HUB_SYNC, false);
354 } else if (!strncmp(name, "units", strlen("units")))
355 value = sensor_inst->fields[field_index].attribute.units;
356 else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
357 value = sensor_inst->fields[field_index].attribute.unit_expo;
358 else if (!strncmp(name, "size", strlen("size")))
359 value = sensor_inst->fields[field_index].attribute.size;
360 else if (!strncmp(name, "minimum", strlen("minimum")))
361 value = sensor_inst->fields[field_index].attribute.
362 logical_minimum;
363 else if (!strncmp(name, "maximum", strlen("maximum")))
364 value = sensor_inst->fields[field_index].attribute.
365 logical_maximum;
366 else if (!strncmp(name, "name", strlen("name"))) {
367 struct hid_custom_usage_desc *usage_desc;
368
369 usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
370 ARRAY_SIZE(hid_custom_usage_desc_table),
371 sizeof(struct hid_custom_usage_desc),
372 usage_id_cmp);
373 if (usage_desc)
374 return snprintf(buf, PAGE_SIZE, "%s\n",
375 usage_desc->desc);
376 else
377 return sprintf(buf, "not-specified\n");
378 } else
379 return -EINVAL;
380
381 return sprintf(buf, "%d\n", value);
382}
383
384static ssize_t store_value(struct device *dev, struct device_attribute *attr,
385 const char *buf, size_t count)
386{
387 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
388 int index, field_index, usage;
389 char name[HID_CUSTOM_NAME_LENGTH];
390 int value, ret;
391
392 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
393 name) == 3) {
394 field_index = index + sensor_inst->input_field_count;
395 } else
396 return -EINVAL;
397
398 if (!strncmp(name, "value", strlen("value"))) {
399 u32 report_id;
400
401 if (kstrtoint(buf, 0, &value) != 0)
402 return -EINVAL;
403
404 report_id = sensor_inst->fields[field_index].attribute.
405 report_id;
406 ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
407 index, sizeof(value), &value);
408 if (ret)
409 return ret;
410 } else
411 return -EINVAL;
412
413 return count;
414}
415
416static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
417 unsigned usage_id, size_t raw_len,
418 char *raw_data, void *priv)
419{
420 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
421 struct hid_sensor_sample header;
422
423 /* If any error occurs in a sample, rest of the fields are ignored */
424 if (sensor_inst->input_skip_sample) {
425 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
426 return 0;
427 }
428
429 hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
430 (int) (sensor_inst->input_report_recd_size + raw_len),
431 sensor_inst->input_report_size);
432
433 if (!test_bit(0, &sensor_inst->misc_opened))
434 return 0;
435
436 if (!sensor_inst->input_report_recd_size) {
437 int required_size = sizeof(struct hid_sensor_sample) +
438 sensor_inst->input_report_size;
439 header.usage_id = hsdev->usage;
440 header.raw_len = sensor_inst->input_report_size;
441 header.timestamp = ktime_get_real_ns();
442 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
443 kfifo_in(&sensor_inst->data_fifo,
444 (unsigned char *)&header,
445 sizeof(header));
446 } else
447 sensor_inst->input_skip_sample = true;
448 }
449 if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
450 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
451 raw_len);
452
453 sensor_inst->input_report_recd_size += raw_len;
454
455 return 0;
456}
457
458static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
459 unsigned usage_id, void *priv)
460{
461 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
462
463 if (!test_bit(0, &sensor_inst->misc_opened))
464 return 0;
465
466 sensor_inst->input_report_recd_size = 0;
467 sensor_inst->input_skip_sample = false;
468
469 wake_up(&sensor_inst->wait);
470
471 return 0;
472}
473
474static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
475 int index, int report_type,
476 struct hid_report *report,
477 struct hid_field *field)
478{
479 struct hid_sensor_custom_field *sensor_field;
480 void *fields;
481
482 fields = krealloc(sensor_inst->fields,
483 (sensor_inst->sensor_field_count + 1) *
484 sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
485 if (!fields) {
486 kfree(sensor_inst->fields);
487 return -ENOMEM;
488 }
489 sensor_inst->fields = fields;
490 sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
491 sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
492 if (field->logical)
493 sensor_field->attribute.attrib_id = field->logical;
494 else
495 sensor_field->attribute.attrib_id = field->usage[0].hid;
496
497 sensor_field->attribute.index = index;
498 sensor_field->attribute.report_id = report->id;
499 sensor_field->attribute.units = field->unit;
500 sensor_field->attribute.unit_expo = field->unit_exponent;
501 sensor_field->attribute.size = (field->report_size / 8);
502 sensor_field->attribute.logical_minimum = field->logical_minimum;
503 sensor_field->attribute.logical_maximum = field->logical_maximum;
504
505 if (report_type == HID_FEATURE_REPORT)
506 snprintf(sensor_field->group_name,
507 sizeof(sensor_field->group_name), "feature-%x-%x",
508 sensor_field->attribute.index,
509 sensor_field->attribute.attrib_id);
510 else if (report_type == HID_INPUT_REPORT) {
511 snprintf(sensor_field->group_name,
512 sizeof(sensor_field->group_name),
513 "input-%x-%x", sensor_field->attribute.index,
514 sensor_field->attribute.attrib_id);
515 sensor_inst->input_field_count++;
516 sensor_inst->input_report_size += (field->report_size *
517 field->report_count) / 8;
518 }
519
520 memset(&sensor_field->hid_custom_attribute_group, 0,
521 sizeof(struct attribute_group));
522 sensor_inst->sensor_field_count++;
523
524 return 0;
525}
526
527static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
528 struct hid_report_enum *report_enum,
529 int report_type)
530{
531 int i;
532 int ret;
533 struct hid_report *report;
534 struct hid_field *field;
535 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
536
537 list_for_each_entry(report, &report_enum->report_list, list) {
538 for (i = 0; i < report->maxfield; ++i) {
539 field = report->field[i];
540 if (field->maxusage &&
541 ((field->usage[0].collection_index >=
542 hsdev->start_collection_index) &&
543 (field->usage[0].collection_index <
544 hsdev->end_collection_index))) {
545
546 ret = hid_sensor_custom_add_field(sensor_inst,
547 i,
548 report_type,
549 report,
550 field);
551 if (ret)
552 return ret;
553
554 }
555 }
556 }
557
558 return 0;
559}
560
561static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
562 *sensor_inst)
563{
564 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
565 struct hid_device *hdev = hsdev->hdev;
566 int ret = -1;
567 int i, j;
568
569 for (j = 0; j < HID_REPORT_TYPES; ++j) {
570 if (j == HID_OUTPUT_REPORT)
571 continue;
572
573 ret = hid_sensor_custom_add_fields(sensor_inst,
574 &hdev->report_enum[j], j);
575 if (ret)
576 return ret;
577
578 }
579
580 /* Create sysfs attributes */
581 for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
582 j = 0;
583 while (j < HID_CUSTOM_TOTAL_ATTRS &&
584 hid_custom_attrs[j].name) {
585 struct device_attribute *device_attr;
586
587 device_attr = &sensor_inst->fields[i].sd_attrs[j];
588
589 snprintf((char *)&sensor_inst->fields[i].attr_name[j],
590 HID_CUSTOM_NAME_LENGTH, "%s-%s",
591 sensor_inst->fields[i].group_name,
592 hid_custom_attrs[j].name);
593 sysfs_attr_init(&device_attr->attr);
594 device_attr->attr.name =
595 (char *)&sensor_inst->fields[i].attr_name[j];
596 device_attr->attr.mode = hid_custom_attrs[j].mode;
597 device_attr->show = show_value;
598 if (hid_custom_attrs[j].mode & S_IWUSR)
599 device_attr->store = store_value;
600 sensor_inst->fields[i].attrs[j] = &device_attr->attr;
601 ++j;
602 }
603 sensor_inst->fields[i].attrs[j] = NULL;
604 sensor_inst->fields[i].hid_custom_attribute_group.attrs =
605 sensor_inst->fields[i].attrs;
606 sensor_inst->fields[i].hid_custom_attribute_group.name =
607 sensor_inst->fields[i].group_name;
608 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
609 &sensor_inst->fields[i].
610 hid_custom_attribute_group);
611 if (ret)
612 break;
613
614 /* For power or report field store indexes */
615 if (sensor_inst->fields[i].attribute.attrib_id ==
616 HID_USAGE_SENSOR_PROY_POWER_STATE)
617 sensor_inst->power_state = &sensor_inst->fields[i];
618 else if (sensor_inst->fields[i].attribute.attrib_id ==
619 HID_USAGE_SENSOR_PROP_REPORT_STATE)
620 sensor_inst->report_state = &sensor_inst->fields[i];
621 }
622
623 return ret;
624}
625
626static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
627 sensor_inst)
628{
629 int i;
630
631 for (i = 0; i < sensor_inst->sensor_field_count; ++i)
632 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
633 &sensor_inst->fields[i].
634 hid_custom_attribute_group);
635
636 kfree(sensor_inst->fields);
637}
638
639static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
640 size_t count, loff_t *f_ps)
641{
642 struct hid_sensor_custom *sensor_inst;
643 unsigned int copied;
644 int ret;
645
646 sensor_inst = container_of(file->private_data,
647 struct hid_sensor_custom, custom_dev);
648
649 if (count < sizeof(struct hid_sensor_sample))
650 return -EINVAL;
651
652 do {
653 if (kfifo_is_empty(&sensor_inst->data_fifo)) {
654 if (file->f_flags & O_NONBLOCK)
655 return -EAGAIN;
656
657 ret = wait_event_interruptible(sensor_inst->wait,
658 !kfifo_is_empty(&sensor_inst->data_fifo));
659 if (ret)
660 return ret;
661 }
662 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
663 &copied);
664 if (ret)
665 return ret;
666
667 } while (copied == 0);
668
669 return copied;
670}
671
672static int hid_sensor_custom_release(struct inode *inode, struct file *file)
673{
674 struct hid_sensor_custom *sensor_inst;
675
676 sensor_inst = container_of(file->private_data,
677 struct hid_sensor_custom, custom_dev);
678
679 clear_bit(0, &sensor_inst->misc_opened);
680
681 return 0;
682}
683
684static int hid_sensor_custom_open(struct inode *inode, struct file *file)
685{
686 struct hid_sensor_custom *sensor_inst;
687
688 sensor_inst = container_of(file->private_data,
689 struct hid_sensor_custom, custom_dev);
690 /* We essentially have single reader and writer */
691 if (test_and_set_bit(0, &sensor_inst->misc_opened))
692 return -EBUSY;
693
694 return stream_open(inode, file);
695}
696
697static __poll_t hid_sensor_custom_poll(struct file *file,
698 struct poll_table_struct *wait)
699{
700 struct hid_sensor_custom *sensor_inst;
701 __poll_t mask = 0;
702
703 sensor_inst = container_of(file->private_data,
704 struct hid_sensor_custom, custom_dev);
705
706 poll_wait(file, &sensor_inst->wait, wait);
707
708 if (!kfifo_is_empty(&sensor_inst->data_fifo))
709 mask = EPOLLIN | EPOLLRDNORM;
710
711 return mask;
712}
713
714static const struct file_operations hid_sensor_custom_fops = {
715 .open = hid_sensor_custom_open,
716 .read = hid_sensor_custom_read,
717 .release = hid_sensor_custom_release,
718 .poll = hid_sensor_custom_poll,
719 .llseek = noop_llseek,
720};
721
722static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
723{
724 int ret;
725
726 ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
727 GFP_KERNEL);
728 if (ret)
729 return ret;
730
731 init_waitqueue_head(&sensor_inst->wait);
732
733 sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
734 sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
735 sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
736 ret = misc_register(&sensor_inst->custom_dev);
737 if (ret) {
738 kfifo_free(&sensor_inst->data_fifo);
739 return ret;
740 }
741 return 0;
742}
743
744static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
745 *sensor_inst)
746{
747 wake_up(&sensor_inst->wait);
748 misc_deregister(&sensor_inst->custom_dev);
749 kfifo_free(&sensor_inst->data_fifo);
750
751}
752
753/* luid defined in FW (e.g. ISH). Maybe used to identify sensor. */
754static const char *const known_sensor_luid[] = { "020B000000000000" };
755
756static int get_luid_table_index(unsigned char *usage_str)
757{
758 int i;
759
760 for (i = 0; i < ARRAY_SIZE(known_sensor_luid); i++) {
761 if (!strncmp(usage_str, known_sensor_luid[i],
762 strlen(known_sensor_luid[i])))
763 return i;
764 }
765
766 return -ENODEV;
767}
768
769static int get_known_custom_sensor_index(struct hid_sensor_hub_device *hsdev)
770{
771 struct hid_sensor_hub_attribute_info sensor_manufacturer = { 0 };
772 struct hid_sensor_hub_attribute_info sensor_luid_info = { 0 };
773 int report_size;
774 int ret;
775 static u16 w_buf[HID_CUSTOM_MAX_FEATURE_BYTES];
776 static char buf[HID_CUSTOM_MAX_FEATURE_BYTES];
777 int i;
778
779 memset(w_buf, 0, sizeof(w_buf));
780 memset(buf, 0, sizeof(buf));
781
782 /* get manufacturer info */
783 ret = sensor_hub_input_get_attribute_info(hsdev,
784 HID_FEATURE_REPORT, hsdev->usage,
785 HID_USAGE_SENSOR_PROP_MANUFACTURER, &sensor_manufacturer);
786 if (ret < 0)
787 return ret;
788
789 report_size =
790 sensor_hub_get_feature(hsdev, sensor_manufacturer.report_id,
791 sensor_manufacturer.index, sizeof(w_buf),
792 w_buf);
793 if (report_size <= 0) {
794 hid_err(hsdev->hdev,
795 "Failed to get sensor manufacturer info %d\n",
796 report_size);
797 return -ENODEV;
798 }
799
800 /* convert from wide char to char */
801 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++)
802 buf[i] = (char)w_buf[i];
803
804 /* ensure it's ISH sensor */
805 if (strncmp(buf, "INTEL", strlen("INTEL")))
806 return -ENODEV;
807
808 memset(w_buf, 0, sizeof(w_buf));
809 memset(buf, 0, sizeof(buf));
810
811 /* get real usage id */
812 ret = sensor_hub_input_get_attribute_info(hsdev,
813 HID_FEATURE_REPORT, hsdev->usage,
814 HID_USAGE_SENSOR_PROP_SERIAL_NUM, &sensor_luid_info);
815 if (ret < 0)
816 return ret;
817
818 report_size = sensor_hub_get_feature(hsdev, sensor_luid_info.report_id,
819 sensor_luid_info.index, sizeof(w_buf),
820 w_buf);
821 if (report_size <= 0) {
822 hid_err(hsdev->hdev, "Failed to get real usage info %d\n",
823 report_size);
824 return -ENODEV;
825 }
826
827 /* convert from wide char to char */
828 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++)
829 buf[i] = (char)w_buf[i];
830
831 if (strlen(buf) != strlen(known_sensor_luid[0]) + 5) {
832 hid_err(hsdev->hdev,
833 "%s luid length not match %zu != (%zu + 5)\n", __func__,
834 strlen(buf), strlen(known_sensor_luid[0]));
835 return -ENODEV;
836 }
837
838 /* get table index with luid (not matching 'LUID: ' in luid) */
839 return get_luid_table_index(&buf[5]);
840}
841
842static struct platform_device *
843hid_sensor_register_platform_device(struct platform_device *pdev,
844 struct hid_sensor_hub_device *hsdev,
845 int index)
846{
847 char real_usage[HID_SENSOR_USAGE_LENGTH] = { 0 };
848 struct platform_device *custom_pdev;
849 const char *dev_name;
850 char *c;
851
852 /* copy real usage id */
853 memcpy(real_usage, known_sensor_luid[index], 4);
854
855 /* usage id are all lowcase */
856 for (c = real_usage; *c != '\0'; c++)
857 *c = tolower(*c);
858
859 /* HID-SENSOR-INT-REAL_USAGE_ID */
860 dev_name = kasprintf(GFP_KERNEL, "HID-SENSOR-INT-%s", real_usage);
861 if (!dev_name)
862 return ERR_PTR(-ENOMEM);
863
864 custom_pdev = platform_device_register_data(pdev->dev.parent, dev_name,
865 PLATFORM_DEVID_NONE, hsdev,
866 sizeof(*hsdev));
867 kfree(dev_name);
868 return custom_pdev;
869}
870
871static int hid_sensor_custom_probe(struct platform_device *pdev)
872{
873 struct hid_sensor_custom *sensor_inst;
874 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
875 int ret;
876 int index;
877
878 sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
879 GFP_KERNEL);
880 if (!sensor_inst)
881 return -ENOMEM;
882
883 sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
884 sensor_inst->callbacks.send_event = hid_sensor_send_event;
885 sensor_inst->callbacks.pdev = pdev;
886 sensor_inst->hsdev = hsdev;
887 sensor_inst->pdev = pdev;
888 mutex_init(&sensor_inst->mutex);
889 platform_set_drvdata(pdev, sensor_inst);
890
891 index = get_known_custom_sensor_index(hsdev);
892 if (index >= 0 && index < ARRAY_SIZE(known_sensor_luid)) {
893 sensor_inst->custom_pdev =
894 hid_sensor_register_platform_device(pdev, hsdev, index);
895
896 ret = PTR_ERR_OR_ZERO(sensor_inst->custom_pdev);
897 if (ret) {
898 dev_err(&pdev->dev,
899 "register_platform_device failed\n");
900 return ret;
901 }
902
903 return 0;
904 }
905
906 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
907 &sensor_inst->callbacks);
908 if (ret < 0) {
909 dev_err(&pdev->dev, "callback reg failed\n");
910 return ret;
911 }
912
913 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
914 &enable_sensor_attr_group);
915 if (ret)
916 goto err_remove_callback;
917
918 ret = hid_sensor_custom_add_attributes(sensor_inst);
919 if (ret)
920 goto err_remove_group;
921
922 ret = hid_sensor_custom_dev_if_add(sensor_inst);
923 if (ret)
924 goto err_remove_attributes;
925
926 return 0;
927
928err_remove_attributes:
929 hid_sensor_custom_remove_attributes(sensor_inst);
930err_remove_group:
931 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
932 &enable_sensor_attr_group);
933err_remove_callback:
934 sensor_hub_remove_callback(hsdev, hsdev->usage);
935
936 return ret;
937}
938
939static int hid_sensor_custom_remove(struct platform_device *pdev)
940{
941 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
942 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
943
944 if (sensor_inst->custom_pdev) {
945 platform_device_unregister(sensor_inst->custom_pdev);
946 return 0;
947 }
948
949 hid_sensor_custom_dev_if_remove(sensor_inst);
950 hid_sensor_custom_remove_attributes(sensor_inst);
951 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
952 &enable_sensor_attr_group);
953 sensor_hub_remove_callback(hsdev, hsdev->usage);
954
955 return 0;
956}
957
958static const struct platform_device_id hid_sensor_custom_ids[] = {
959 {
960 .name = "HID-SENSOR-2000e1",
961 },
962 {
963 .name = "HID-SENSOR-2000e2",
964 },
965 { /* sentinel */ }
966};
967MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
968
969static struct platform_driver hid_sensor_custom_platform_driver = {
970 .id_table = hid_sensor_custom_ids,
971 .driver = {
972 .name = KBUILD_MODNAME,
973 },
974 .probe = hid_sensor_custom_probe,
975 .remove = hid_sensor_custom_remove,
976};
977module_platform_driver(hid_sensor_custom_platform_driver);
978
979MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
980MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
981MODULE_LICENSE("GPL");
982

source code of linux/drivers/hid/hid-sensor-custom.c