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
27 struct 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
37 struct 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 */
59 struct hid_sensor_sample {
60 u32 usage_id;
61 u64 timestamp;
62 u32 raw_len;
63 } __packed;
64
65 static 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
76 static 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
usage_id_cmp(const void * p1,const void * p2)141 static 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
enable_sensor_show(struct device * dev,struct device_attribute * attr,char * buf)152 static 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
set_power_report_state(struct hid_sensor_custom * sensor_inst,bool state)160 static 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
enable_sensor_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)230 static 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 }
258 unlock_state:
259 mutex_unlock(&sensor_inst->mutex);
260 if (ret < 0)
261 return ret;
262
263 return count;
264 }
265 static DEVICE_ATTR_RW(enable_sensor);
266
267 static struct attribute *enable_sensor_attrs[] = {
268 &dev_attr_enable_sensor.attr,
269 NULL,
270 };
271
272 static const struct attribute_group enable_sensor_attr_group = {
273 .attrs = enable_sensor_attrs,
274 };
275
show_value(struct device * dev,struct device_attribute * attr,char * buf)276 static 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
store_value(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)384 static 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;
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 sensor_hub_set_feature(sensor_inst->hsdev, report_id,
407 index, sizeof(value), &value);
408 } else
409 return -EINVAL;
410
411 return count;
412 }
413
hid_sensor_capture_sample(struct hid_sensor_hub_device * hsdev,unsigned usage_id,size_t raw_len,char * raw_data,void * priv)414 static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
415 unsigned usage_id, size_t raw_len,
416 char *raw_data, void *priv)
417 {
418 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
419 struct hid_sensor_sample header;
420
421 /* If any error occurs in a sample, rest of the fields are ignored */
422 if (sensor_inst->input_skip_sample) {
423 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
424 return 0;
425 }
426
427 hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
428 (int) (sensor_inst->input_report_recd_size + raw_len),
429 sensor_inst->input_report_size);
430
431 if (!test_bit(0, &sensor_inst->misc_opened))
432 return 0;
433
434 if (!sensor_inst->input_report_recd_size) {
435 int required_size = sizeof(struct hid_sensor_sample) +
436 sensor_inst->input_report_size;
437 header.usage_id = hsdev->usage;
438 header.raw_len = sensor_inst->input_report_size;
439 header.timestamp = ktime_get_real_ns();
440 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
441 kfifo_in(&sensor_inst->data_fifo,
442 (unsigned char *)&header,
443 sizeof(header));
444 } else
445 sensor_inst->input_skip_sample = true;
446 }
447 if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
448 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
449 raw_len);
450
451 sensor_inst->input_report_recd_size += raw_len;
452
453 return 0;
454 }
455
hid_sensor_send_event(struct hid_sensor_hub_device * hsdev,unsigned usage_id,void * priv)456 static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
457 unsigned usage_id, void *priv)
458 {
459 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
460
461 if (!test_bit(0, &sensor_inst->misc_opened))
462 return 0;
463
464 sensor_inst->input_report_recd_size = 0;
465 sensor_inst->input_skip_sample = false;
466
467 wake_up(&sensor_inst->wait);
468
469 return 0;
470 }
471
hid_sensor_custom_add_field(struct hid_sensor_custom * sensor_inst,int index,int report_type,struct hid_report * report,struct hid_field * field)472 static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
473 int index, int report_type,
474 struct hid_report *report,
475 struct hid_field *field)
476 {
477 struct hid_sensor_custom_field *sensor_field;
478 void *fields;
479
480 fields = krealloc(sensor_inst->fields,
481 (sensor_inst->sensor_field_count + 1) *
482 sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
483 if (!fields) {
484 kfree(sensor_inst->fields);
485 return -ENOMEM;
486 }
487 sensor_inst->fields = fields;
488 sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
489 sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
490 if (field->logical)
491 sensor_field->attribute.attrib_id = field->logical;
492 else
493 sensor_field->attribute.attrib_id = field->usage[0].hid;
494
495 sensor_field->attribute.index = index;
496 sensor_field->attribute.report_id = report->id;
497 sensor_field->attribute.units = field->unit;
498 sensor_field->attribute.unit_expo = field->unit_exponent;
499 sensor_field->attribute.size = (field->report_size / 8);
500 sensor_field->attribute.logical_minimum = field->logical_minimum;
501 sensor_field->attribute.logical_maximum = field->logical_maximum;
502
503 if (report_type == HID_FEATURE_REPORT)
504 snprintf(sensor_field->group_name,
505 sizeof(sensor_field->group_name), "feature-%x-%x",
506 sensor_field->attribute.index,
507 sensor_field->attribute.attrib_id);
508 else if (report_type == HID_INPUT_REPORT) {
509 snprintf(sensor_field->group_name,
510 sizeof(sensor_field->group_name),
511 "input-%x-%x", sensor_field->attribute.index,
512 sensor_field->attribute.attrib_id);
513 sensor_inst->input_field_count++;
514 sensor_inst->input_report_size += (field->report_size *
515 field->report_count) / 8;
516 }
517
518 memset(&sensor_field->hid_custom_attribute_group, 0,
519 sizeof(struct attribute_group));
520 sensor_inst->sensor_field_count++;
521
522 return 0;
523 }
524
hid_sensor_custom_add_fields(struct hid_sensor_custom * sensor_inst,struct hid_report_enum * report_enum,int report_type)525 static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
526 struct hid_report_enum *report_enum,
527 int report_type)
528 {
529 int i;
530 int ret;
531 struct hid_report *report;
532 struct hid_field *field;
533 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
534
535 list_for_each_entry(report, &report_enum->report_list, list) {
536 for (i = 0; i < report->maxfield; ++i) {
537 field = report->field[i];
538 if (field->maxusage &&
539 ((field->usage[0].collection_index >=
540 hsdev->start_collection_index) &&
541 (field->usage[0].collection_index <
542 hsdev->end_collection_index))) {
543
544 ret = hid_sensor_custom_add_field(sensor_inst,
545 i,
546 report_type,
547 report,
548 field);
549 if (ret)
550 return ret;
551
552 }
553 }
554 }
555
556 return 0;
557 }
558
hid_sensor_custom_add_attributes(struct hid_sensor_custom * sensor_inst)559 static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
560 *sensor_inst)
561 {
562 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
563 struct hid_device *hdev = hsdev->hdev;
564 int ret = -1;
565 int i, j;
566
567 for (j = 0; j < HID_REPORT_TYPES; ++j) {
568 if (j == HID_OUTPUT_REPORT)
569 continue;
570
571 ret = hid_sensor_custom_add_fields(sensor_inst,
572 &hdev->report_enum[j], j);
573 if (ret)
574 return ret;
575
576 }
577
578 /* Create sysfs attributes */
579 for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
580 j = 0;
581 while (j < HID_CUSTOM_TOTAL_ATTRS &&
582 hid_custom_attrs[j].name) {
583 struct device_attribute *device_attr;
584
585 device_attr = &sensor_inst->fields[i].sd_attrs[j];
586
587 snprintf((char *)&sensor_inst->fields[i].attr_name[j],
588 HID_CUSTOM_NAME_LENGTH, "%s-%s",
589 sensor_inst->fields[i].group_name,
590 hid_custom_attrs[j].name);
591 sysfs_attr_init(&device_attr->attr);
592 device_attr->attr.name =
593 (char *)&sensor_inst->fields[i].attr_name[j];
594 device_attr->attr.mode = hid_custom_attrs[j].mode;
595 device_attr->show = show_value;
596 if (hid_custom_attrs[j].mode & S_IWUSR)
597 device_attr->store = store_value;
598 sensor_inst->fields[i].attrs[j] = &device_attr->attr;
599 ++j;
600 }
601 sensor_inst->fields[i].attrs[j] = NULL;
602 sensor_inst->fields[i].hid_custom_attribute_group.attrs =
603 sensor_inst->fields[i].attrs;
604 sensor_inst->fields[i].hid_custom_attribute_group.name =
605 sensor_inst->fields[i].group_name;
606 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
607 &sensor_inst->fields[i].
608 hid_custom_attribute_group);
609 if (ret)
610 break;
611
612 /* For power or report field store indexes */
613 if (sensor_inst->fields[i].attribute.attrib_id ==
614 HID_USAGE_SENSOR_PROY_POWER_STATE)
615 sensor_inst->power_state = &sensor_inst->fields[i];
616 else if (sensor_inst->fields[i].attribute.attrib_id ==
617 HID_USAGE_SENSOR_PROP_REPORT_STATE)
618 sensor_inst->report_state = &sensor_inst->fields[i];
619 }
620
621 return ret;
622 }
623
hid_sensor_custom_remove_attributes(struct hid_sensor_custom * sensor_inst)624 static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
625 sensor_inst)
626 {
627 int i;
628
629 for (i = 0; i < sensor_inst->sensor_field_count; ++i)
630 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
631 &sensor_inst->fields[i].
632 hid_custom_attribute_group);
633
634 kfree(sensor_inst->fields);
635 }
636
hid_sensor_custom_read(struct file * file,char __user * buf,size_t count,loff_t * f_ps)637 static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
638 size_t count, loff_t *f_ps)
639 {
640 struct hid_sensor_custom *sensor_inst;
641 unsigned int copied;
642 int ret;
643
644 sensor_inst = container_of(file->private_data,
645 struct hid_sensor_custom, custom_dev);
646
647 if (count < sizeof(struct hid_sensor_sample))
648 return -EINVAL;
649
650 do {
651 if (kfifo_is_empty(&sensor_inst->data_fifo)) {
652 if (file->f_flags & O_NONBLOCK)
653 return -EAGAIN;
654
655 ret = wait_event_interruptible(sensor_inst->wait,
656 !kfifo_is_empty(&sensor_inst->data_fifo));
657 if (ret)
658 return ret;
659 }
660 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
661 &copied);
662 if (ret)
663 return ret;
664
665 } while (copied == 0);
666
667 return copied;
668 }
669
hid_sensor_custom_release(struct inode * inode,struct file * file)670 static int hid_sensor_custom_release(struct inode *inode, struct file *file)
671 {
672 struct hid_sensor_custom *sensor_inst;
673
674 sensor_inst = container_of(file->private_data,
675 struct hid_sensor_custom, custom_dev);
676
677 clear_bit(0, &sensor_inst->misc_opened);
678
679 return 0;
680 }
681
hid_sensor_custom_open(struct inode * inode,struct file * file)682 static int hid_sensor_custom_open(struct inode *inode, struct file *file)
683 {
684 struct hid_sensor_custom *sensor_inst;
685
686 sensor_inst = container_of(file->private_data,
687 struct hid_sensor_custom, custom_dev);
688 /* We essentially have single reader and writer */
689 if (test_and_set_bit(0, &sensor_inst->misc_opened))
690 return -EBUSY;
691
692 return stream_open(inode, file);
693 }
694
hid_sensor_custom_poll(struct file * file,struct poll_table_struct * wait)695 static __poll_t hid_sensor_custom_poll(struct file *file,
696 struct poll_table_struct *wait)
697 {
698 struct hid_sensor_custom *sensor_inst;
699 __poll_t mask = 0;
700
701 sensor_inst = container_of(file->private_data,
702 struct hid_sensor_custom, custom_dev);
703
704 poll_wait(file, &sensor_inst->wait, wait);
705
706 if (!kfifo_is_empty(&sensor_inst->data_fifo))
707 mask = EPOLLIN | EPOLLRDNORM;
708
709 return mask;
710 }
711
712 static const struct file_operations hid_sensor_custom_fops = {
713 .open = hid_sensor_custom_open,
714 .read = hid_sensor_custom_read,
715 .release = hid_sensor_custom_release,
716 .poll = hid_sensor_custom_poll,
717 .llseek = noop_llseek,
718 };
719
hid_sensor_custom_dev_if_add(struct hid_sensor_custom * sensor_inst)720 static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
721 {
722 int ret;
723
724 ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
725 GFP_KERNEL);
726 if (ret)
727 return ret;
728
729 init_waitqueue_head(&sensor_inst->wait);
730
731 sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
732 sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
733 sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
734 ret = misc_register(&sensor_inst->custom_dev);
735 if (ret) {
736 kfifo_free(&sensor_inst->data_fifo);
737 return ret;
738 }
739 return 0;
740 }
741
hid_sensor_custom_dev_if_remove(struct hid_sensor_custom * sensor_inst)742 static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
743 *sensor_inst)
744 {
745 wake_up(&sensor_inst->wait);
746 misc_deregister(&sensor_inst->custom_dev);
747 kfifo_free(&sensor_inst->data_fifo);
748
749 }
750
751 /* luid defined in FW (e.g. ISH). Maybe used to identify sensor. */
752 static const char *const known_sensor_luid[] = { "020B000000000000" };
753
get_luid_table_index(unsigned char * usage_str)754 static int get_luid_table_index(unsigned char *usage_str)
755 {
756 int i;
757
758 for (i = 0; i < ARRAY_SIZE(known_sensor_luid); i++) {
759 if (!strncmp(usage_str, known_sensor_luid[i],
760 strlen(known_sensor_luid[i])))
761 return i;
762 }
763
764 return -ENODEV;
765 }
766
get_known_custom_sensor_index(struct hid_sensor_hub_device * hsdev)767 static int get_known_custom_sensor_index(struct hid_sensor_hub_device *hsdev)
768 {
769 struct hid_sensor_hub_attribute_info sensor_manufacturer = { 0 };
770 struct hid_sensor_hub_attribute_info sensor_luid_info = { 0 };
771 int report_size;
772 int ret;
773 static u16 w_buf[HID_CUSTOM_MAX_FEATURE_BYTES];
774 static char buf[HID_CUSTOM_MAX_FEATURE_BYTES];
775 int i;
776
777 memset(w_buf, 0, sizeof(w_buf));
778 memset(buf, 0, sizeof(buf));
779
780 /* get manufacturer info */
781 ret = sensor_hub_input_get_attribute_info(hsdev,
782 HID_FEATURE_REPORT, hsdev->usage,
783 HID_USAGE_SENSOR_PROP_MANUFACTURER, &sensor_manufacturer);
784 if (ret < 0)
785 return ret;
786
787 report_size =
788 sensor_hub_get_feature(hsdev, sensor_manufacturer.report_id,
789 sensor_manufacturer.index, sizeof(w_buf),
790 w_buf);
791 if (report_size <= 0) {
792 hid_err(hsdev->hdev,
793 "Failed to get sensor manufacturer info %d\n",
794 report_size);
795 return -ENODEV;
796 }
797
798 /* convert from wide char to char */
799 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++)
800 buf[i] = (char)w_buf[i];
801
802 /* ensure it's ISH sensor */
803 if (strncmp(buf, "INTEL", strlen("INTEL")))
804 return -ENODEV;
805
806 memset(w_buf, 0, sizeof(w_buf));
807 memset(buf, 0, sizeof(buf));
808
809 /* get real usage id */
810 ret = sensor_hub_input_get_attribute_info(hsdev,
811 HID_FEATURE_REPORT, hsdev->usage,
812 HID_USAGE_SENSOR_PROP_SERIAL_NUM, &sensor_luid_info);
813 if (ret < 0)
814 return ret;
815
816 report_size = sensor_hub_get_feature(hsdev, sensor_luid_info.report_id,
817 sensor_luid_info.index, sizeof(w_buf),
818 w_buf);
819 if (report_size <= 0) {
820 hid_err(hsdev->hdev, "Failed to get real usage info %d\n",
821 report_size);
822 return -ENODEV;
823 }
824
825 /* convert from wide char to char */
826 for (i = 0; i < ARRAY_SIZE(buf) - 1 && w_buf[i]; i++)
827 buf[i] = (char)w_buf[i];
828
829 if (strlen(buf) != strlen(known_sensor_luid[0]) + 5) {
830 hid_err(hsdev->hdev,
831 "%s luid length not match %zu != (%zu + 5)\n", __func__,
832 strlen(buf), strlen(known_sensor_luid[0]));
833 return -ENODEV;
834 }
835
836 /* get table index with luid (not matching 'LUID: ' in luid) */
837 return get_luid_table_index(&buf[5]);
838 }
839
840 static struct platform_device *
hid_sensor_register_platform_device(struct platform_device * pdev,struct hid_sensor_hub_device * hsdev,int index)841 hid_sensor_register_platform_device(struct platform_device *pdev,
842 struct hid_sensor_hub_device *hsdev,
843 int index)
844 {
845 char real_usage[HID_SENSOR_USAGE_LENGTH] = { 0 };
846 struct platform_device *custom_pdev;
847 const char *dev_name;
848 char *c;
849
850 /* copy real usage id */
851 memcpy(real_usage, known_sensor_luid[index], 4);
852
853 /* usage id are all lowcase */
854 for (c = real_usage; *c != '\0'; c++)
855 *c = tolower(*c);
856
857 /* HID-SENSOR-INT-REAL_USAGE_ID */
858 dev_name = kasprintf(GFP_KERNEL, "HID-SENSOR-INT-%s", real_usage);
859 if (!dev_name)
860 return ERR_PTR(-ENOMEM);
861
862 custom_pdev = platform_device_register_data(pdev->dev.parent, dev_name,
863 PLATFORM_DEVID_NONE, hsdev,
864 sizeof(*hsdev));
865 kfree(dev_name);
866 return custom_pdev;
867 }
868
hid_sensor_custom_probe(struct platform_device * pdev)869 static int hid_sensor_custom_probe(struct platform_device *pdev)
870 {
871 struct hid_sensor_custom *sensor_inst;
872 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
873 int ret;
874 int index;
875
876 sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
877 GFP_KERNEL);
878 if (!sensor_inst)
879 return -ENOMEM;
880
881 sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
882 sensor_inst->callbacks.send_event = hid_sensor_send_event;
883 sensor_inst->callbacks.pdev = pdev;
884 sensor_inst->hsdev = hsdev;
885 sensor_inst->pdev = pdev;
886 mutex_init(&sensor_inst->mutex);
887 platform_set_drvdata(pdev, sensor_inst);
888
889 index = get_known_custom_sensor_index(hsdev);
890 if (index >= 0 && index < ARRAY_SIZE(known_sensor_luid)) {
891 sensor_inst->custom_pdev =
892 hid_sensor_register_platform_device(pdev, hsdev, index);
893
894 ret = PTR_ERR_OR_ZERO(sensor_inst->custom_pdev);
895 if (ret) {
896 dev_err(&pdev->dev,
897 "register_platform_device failed\n");
898 return ret;
899 }
900
901 return 0;
902 }
903
904 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
905 &sensor_inst->callbacks);
906 if (ret < 0) {
907 dev_err(&pdev->dev, "callback reg failed\n");
908 return ret;
909 }
910
911 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
912 &enable_sensor_attr_group);
913 if (ret)
914 goto err_remove_callback;
915
916 ret = hid_sensor_custom_add_attributes(sensor_inst);
917 if (ret)
918 goto err_remove_group;
919
920 ret = hid_sensor_custom_dev_if_add(sensor_inst);
921 if (ret)
922 goto err_remove_attributes;
923
924 return 0;
925
926 err_remove_attributes:
927 hid_sensor_custom_remove_attributes(sensor_inst);
928 err_remove_group:
929 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
930 &enable_sensor_attr_group);
931 err_remove_callback:
932 sensor_hub_remove_callback(hsdev, hsdev->usage);
933
934 return ret;
935 }
936
hid_sensor_custom_remove(struct platform_device * pdev)937 static int hid_sensor_custom_remove(struct platform_device *pdev)
938 {
939 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
940 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
941
942 if (sensor_inst->custom_pdev) {
943 platform_device_unregister(sensor_inst->custom_pdev);
944 return 0;
945 }
946
947 hid_sensor_custom_dev_if_remove(sensor_inst);
948 hid_sensor_custom_remove_attributes(sensor_inst);
949 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
950 &enable_sensor_attr_group);
951 sensor_hub_remove_callback(hsdev, hsdev->usage);
952
953 return 0;
954 }
955
956 static const struct platform_device_id hid_sensor_custom_ids[] = {
957 {
958 .name = "HID-SENSOR-2000e1",
959 },
960 {
961 .name = "HID-SENSOR-2000e2",
962 },
963 { /* sentinel */ }
964 };
965 MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
966
967 static struct platform_driver hid_sensor_custom_platform_driver = {
968 .id_table = hid_sensor_custom_ids,
969 .driver = {
970 .name = KBUILD_MODNAME,
971 },
972 .probe = hid_sensor_custom_probe,
973 .remove = hid_sensor_custom_remove,
974 };
975 module_platform_driver(hid_sensor_custom_platform_driver);
976
977 MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
978 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
979 MODULE_LICENSE("GPL");
980