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