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Merge tag 'tegra-for-5.2-arm64-soc-fixes' of git://git.kernel.org/pub/scm/linux/kerne...
[linux.git] / drivers / hid / hid-sensor-custom.c
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4a7de051
SP		 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{
77f9f772 160 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
4a7de051
SP		 161
162 return sprintf(buf, "%d\n", sensor_inst->enable);
163}
164
165static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
166 bool state)
167{
168 int power_val = -1;
169 int report_val = -1;
170 u32 power_state_usage_id;
171 u32 report_state_usage_id;
172 int ret;
173
174 /*
175 * It is possible that the power/report state ids are not present.
176 * In this case this function will return success. But if the
177 * ids are present, then it will return error if set fails.
178 */
179 if (state) {
180 power_state_usage_id =
181 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
182 report_state_usage_id =
183 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
184 } else {
185 power_state_usage_id =
186 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
187 report_state_usage_id =
188 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
189 }
190
191 if (sensor_inst->power_state)
192 power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
193 sensor_inst->power_state->attribute.report_id,
194 sensor_inst->power_state->attribute.index,
195 power_state_usage_id);
196 if (sensor_inst->report_state)
197 report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
198 sensor_inst->report_state->attribute.report_id,
199 sensor_inst->report_state->attribute.index,
200 report_state_usage_id);
201
202 if (power_val >= 0) {
203 power_val +=
204 sensor_inst->power_state->attribute.logical_minimum;
205 ret = sensor_hub_set_feature(sensor_inst->hsdev,
206 sensor_inst->power_state->attribute.report_id,
207 sensor_inst->power_state->attribute.index,
208 sizeof(power_val),
209 &power_val);
210 if (ret) {
211 hid_err(sensor_inst->hsdev->hdev,
212 "Set power state failed\n");
213 return ret;
214 }
215 }
216
217 if (report_val >= 0) {
218 report_val +=
219 sensor_inst->report_state->attribute.logical_minimum;
220 ret = sensor_hub_set_feature(sensor_inst->hsdev,
221 sensor_inst->report_state->attribute.report_id,
222 sensor_inst->report_state->attribute.index,
223 sizeof(report_val),
224 &report_val);
225 if (ret) {
226 hid_err(sensor_inst->hsdev->hdev,
227 "Set report state failed\n");
228 return ret;
229 }
230 }
231
232 return 0;
233}
234
235static ssize_t enable_sensor_store(struct device *dev,
236 struct device_attribute *attr,
237 const char *buf, size_t count)
238{
77f9f772 239 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
4a7de051
SP		 240 int value;
241 int ret = -EINVAL;
242
243 if (kstrtoint(buf, 0, &value) != 0)
244 return -EINVAL;
245
246 mutex_lock(&sensor_inst->mutex);
247 if (value && !sensor_inst->enable) {
248 ret = sensor_hub_device_open(sensor_inst->hsdev);
249 if (ret)
250 goto unlock_state;
251
252 ret = set_power_report_state(sensor_inst, true);
253 if (ret) {
254 sensor_hub_device_close(sensor_inst->hsdev);
255 goto unlock_state;
256 }
257 sensor_inst->enable = true;
258 } else if (!value && sensor_inst->enable) {
259 ret = set_power_report_state(sensor_inst, false);
260 sensor_hub_device_close(sensor_inst->hsdev);
261 sensor_inst->enable = false;
262 }
263unlock_state:
264 mutex_unlock(&sensor_inst->mutex);
265 if (ret < 0)
266 return ret;
267
268 return count;
269}
270static DEVICE_ATTR_RW(enable_sensor);
271
272static struct attribute *enable_sensor_attrs[] = {
273 &dev_attr_enable_sensor.attr,
274 NULL,
275};
276
58ee3e08 277static const struct attribute_group enable_sensor_attr_group = {
4a7de051
SP		 278 .attrs = enable_sensor_attrs,
279};
280
281static ssize_t show_value(struct device *dev, struct device_attribute *attr,
282 char *buf)
283{
77f9f772 284 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
4a7de051
SP		 285 struct hid_sensor_hub_attribute_info *attribute;
286 int index, usage, field_index;
287 char name[HID_CUSTOM_NAME_LENGTH];
288 bool feature = false;
289 bool input = false;
290 int value = 0;
291
4c4480aa 292 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
4a7de051
SP		 293 name) == 3) {
294 feature = true;
295 field_index = index + sensor_inst->input_field_count;
4c4480aa 296 } else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
4a7de051
SP		 297 name) == 3) {
298 input = true;
299 field_index = index;
300 } else
301 return -EINVAL;
302
303 if (!strncmp(name, "value", strlen("value"))) {
304 u32 report_id;
305 int ret;
306
307 attribute = &sensor_inst->fields[field_index].attribute;
308 report_id = attribute->report_id;
309 if (feature) {
310 u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
311 int len = 0;
312 u64 value = 0;
313 int i = 0;
314
315 ret = sensor_hub_get_feature(sensor_inst->hsdev,
316 report_id,
317 index,
318 sizeof(values), values);
319 if (ret < 0)
320 return ret;
321
322 while (i < ret) {
323 if (i + attribute->size > ret) {
324 len += snprintf(&buf[len],
325 PAGE_SIZE - len,
326 "%d ", values[i]);
327 break;
328 }
329 switch (attribute->size) {
330 case 2:
331 value = (u64) *(u16 *)&values[i];
332 i += attribute->size;
333 break;
334 case 4:
335 value = (u64) *(u32 *)&values[i];
336 i += attribute->size;
337 break;
338 case 8:
339 value = *(u64 *)&values[i];
340 i += attribute->size;
341 break;
342 default:
343 value = (u64) values[i];
344 ++i;
345 break;
346 }
347 len += snprintf(&buf[len], PAGE_SIZE - len,
348 "%lld ", value);
349 }
350 len += snprintf(&buf[len], PAGE_SIZE - len, "\n");
351
352 return len;
353 } else if (input)
354 value = sensor_hub_input_attr_get_raw_value(
355 sensor_inst->hsdev,
356 sensor_inst->hsdev->usage,
357 usage, report_id,
0145b505 358 SENSOR_HUB_SYNC, false);
4a7de051
SP		 359 } else if (!strncmp(name, "units", strlen("units")))
360 value = sensor_inst->fields[field_index].attribute.units;
361 else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
362 value = sensor_inst->fields[field_index].attribute.unit_expo;
363 else if (!strncmp(name, "size", strlen("size")))
364 value = sensor_inst->fields[field_index].attribute.size;
365 else if (!strncmp(name, "minimum", strlen("minimum")))
366 value = sensor_inst->fields[field_index].attribute.
367 logical_minimum;
368 else if (!strncmp(name, "maximum", strlen("maximum")))
369 value = sensor_inst->fields[field_index].attribute.
370 logical_maximum;
371 else if (!strncmp(name, "name", strlen("name"))) {
372 struct hid_custom_usage_desc *usage_desc;
373
374 usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
375 ARRAY_SIZE(hid_custom_usage_desc_table),
376 sizeof(struct hid_custom_usage_desc),
377 usage_id_cmp);
378 if (usage_desc)
379 return snprintf(buf, PAGE_SIZE, "%s\n",
380 usage_desc->desc);
381 else
382 return sprintf(buf, "not-specified\n");
383 } else
384 return -EINVAL;
385
386 return sprintf(buf, "%d\n", value);
387}
388
389static ssize_t store_value(struct device *dev, struct device_attribute *attr,
390 const char *buf, size_t count)
391{
77f9f772 392 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
4a7de051
SP		 393 int index, field_index, usage;
394 char name[HID_CUSTOM_NAME_LENGTH];
395 int value;
396
4c4480aa 397 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
4a7de051
SP		 398 name) == 3) {
399 field_index = index + sensor_inst->input_field_count;
400 } else
401 return -EINVAL;
402
403 if (!strncmp(name, "value", strlen("value"))) {
404 u32 report_id;
405 int ret;
406
407 if (kstrtoint(buf, 0, &value) != 0)
408 return -EINVAL;
409
410 report_id = sensor_inst->fields[field_index].attribute.
411 report_id;
412 ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
413 index, sizeof(value), &value);
414 } else
415 return -EINVAL;
416
417 return count;
418}
419
420static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
421 unsigned usage_id, size_t raw_len,
422 char *raw_data, void *priv)
423{
424 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
425 struct hid_sensor_sample header;
426
427 /* If any error occurs in a sample, rest of the fields are ignored */
428 if (sensor_inst->input_skip_sample) {
429 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
430 return 0;
431 }
432
433 hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
434 (int) (sensor_inst->input_report_recd_size + raw_len),
435 sensor_inst->input_report_size);
436
437 if (!test_bit(0, &sensor_inst->misc_opened))
438 return 0;
439
440 if (!sensor_inst->input_report_recd_size) {
441 int required_size = sizeof(struct hid_sensor_sample) +
442 sensor_inst->input_report_size;
443 header.usage_id = hsdev->usage;
444 header.raw_len = sensor_inst->input_report_size;
445 header.timestamp = ktime_get_real_ns();
446 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
447 kfifo_in(&sensor_inst->data_fifo,
448 (unsigned char *)&header,
449 sizeof(header));
450 } else
451 sensor_inst->input_skip_sample = true;
452 }
453 if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
454 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
455 raw_len);
456
457 sensor_inst->input_report_recd_size += raw_len;
458
459 return 0;
460}
461
462static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
463 unsigned usage_id, void *priv)
464{
465 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
466
467 if (!test_bit(0, &sensor_inst->misc_opened))
468 return 0;
469
470 sensor_inst->input_report_recd_size = 0;
471 sensor_inst->input_skip_sample = false;
472
473 wake_up(&sensor_inst->wait);
474
475 return 0;
476}
477
478static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
479 int index, int report_type,
480 struct hid_report *report,
481 struct hid_field *field)
482{
483 struct hid_sensor_custom_field *sensor_field;
484 void *fields;
485
486 fields = krealloc(sensor_inst->fields,
487 (sensor_inst->sensor_field_count + 1) *
488 sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
489 if (!fields) {
490 kfree(sensor_inst->fields);
491 return -ENOMEM;
492 }
493 sensor_inst->fields = fields;
494 sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
495 sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
496 if (field->logical)
497 sensor_field->attribute.attrib_id = field->logical;
498 else
499 sensor_field->attribute.attrib_id = field->usage[0].hid;
500
501 sensor_field->attribute.index = index;
502 sensor_field->attribute.report_id = report->id;
503 sensor_field->attribute.units = field->unit;
504 sensor_field->attribute.unit_expo = field->unit_exponent;
505 sensor_field->attribute.size = (field->report_size / 8);
506 sensor_field->attribute.logical_minimum = field->logical_minimum;
507 sensor_field->attribute.logical_maximum = field->logical_maximum;
508
509 if (report_type == HID_FEATURE_REPORT)
510 snprintf(sensor_field->group_name,
511 sizeof(sensor_field->group_name), "feature-%x-%x",
512 sensor_field->attribute.index,
513 sensor_field->attribute.attrib_id);
514 else if (report_type == HID_INPUT_REPORT) {
515 snprintf(sensor_field->group_name,
516 sizeof(sensor_field->group_name),
517 "input-%x-%x", sensor_field->attribute.index,
518 sensor_field->attribute.attrib_id);
519 sensor_inst->input_field_count++;
520 sensor_inst->input_report_size += (field->report_size *
521 field->report_count) / 8;
522 }
523
524 memset(&sensor_field->hid_custom_attribute_group, 0,
525 sizeof(struct attribute_group));
526 sensor_inst->sensor_field_count++;
527
528 return 0;
529}
530
531static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
532 struct hid_report_enum *report_enum,
533 int report_type)
534{
535 int i;
536 int ret;
537 struct hid_report *report;
538 struct hid_field *field;
539 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
540
541 list_for_each_entry(report, &report_enum->report_list, list) {
542 for (i = 0; i < report->maxfield; ++i) {
543 field = report->field[i];
544 if (field->maxusage &&
545 ((field->usage[0].collection_index >=
546 hsdev->start_collection_index) &&
547 (field->usage[0].collection_index <
548 hsdev->end_collection_index))) {
549
550 ret = hid_sensor_custom_add_field(sensor_inst,
551 i,
552 report_type,
553 report,
554 field);
555 if (ret)
556 return ret;
557
558 }
559 }
560 }
561
562 return 0;
563}
564
565static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
566 *sensor_inst)
567{
568 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
569 struct hid_device *hdev = hsdev->hdev;
570 int ret = -1;
571 int i, j;
572
573 for (j = 0; j < HID_REPORT_TYPES; ++j) {
574 if (j == HID_OUTPUT_REPORT)
575 continue;
576
577 ret = hid_sensor_custom_add_fields(sensor_inst,
578 &hdev->report_enum[j], j);
579 if (ret)
580 return ret;
581
582 }
583
584 /* Create sysfs attributes */
585 for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
586 j = 0;
587 while (j < HID_CUSTOM_TOTAL_ATTRS &&
588 hid_custom_attrs[j].name) {
589 struct device_attribute *device_attr;
590
591 device_attr = &sensor_inst->fields[i].sd_attrs[j];
592
593 snprintf((char *)&sensor_inst->fields[i].attr_name[j],
594 HID_CUSTOM_NAME_LENGTH, "%s-%s",
595 sensor_inst->fields[i].group_name,
596 hid_custom_attrs[j].name);
597 sysfs_attr_init(&device_attr->attr);
598 device_attr->attr.name =
599 (char *)&sensor_inst->fields[i].attr_name[j];
600 device_attr->attr.mode = hid_custom_attrs[j].mode;
601 device_attr->show = show_value;
602 if (hid_custom_attrs[j].mode & S_IWUSR)
603 device_attr->store = store_value;
604 sensor_inst->fields[i].attrs[j] = &device_attr->attr;
605 ++j;
606 }
607 sensor_inst->fields[i].attrs[j] = NULL;
608 sensor_inst->fields[i].hid_custom_attribute_group.attrs =
609 sensor_inst->fields[i].attrs;
610 sensor_inst->fields[i].hid_custom_attribute_group.name =
611 sensor_inst->fields[i].group_name;
612 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
613 &sensor_inst->fields[i].
614 hid_custom_attribute_group);
615 if (ret)
616 break;
617
618 /* For power or report field store indexes */
619 if (sensor_inst->fields[i].attribute.attrib_id ==
620 HID_USAGE_SENSOR_PROY_POWER_STATE)
621 sensor_inst->power_state = &sensor_inst->fields[i];
622 else if (sensor_inst->fields[i].attribute.attrib_id ==
623 HID_USAGE_SENSOR_PROP_REPORT_STATE)
624 sensor_inst->report_state = &sensor_inst->fields[i];
625 }
626
627 return ret;
628}
629
630static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
631 sensor_inst)
632{
633 int i;
634
635 for (i = 0; i < sensor_inst->sensor_field_count; ++i)
636 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
637 &sensor_inst->fields[i].
638 hid_custom_attribute_group);
639
640 kfree(sensor_inst->fields);
641}
642
643static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
644 size_t count, loff_t *f_ps)
645{
646 struct hid_sensor_custom *sensor_inst;
647 unsigned int copied;
648 int ret;
649
650 sensor_inst = container_of(file->private_data,
651 struct hid_sensor_custom, custom_dev);
652
653 if (count < sizeof(struct hid_sensor_sample))
654 return -EINVAL;
655
656 do {
657 if (kfifo_is_empty(&sensor_inst->data_fifo)) {
658 if (file->f_flags & O_NONBLOCK)
659 return -EAGAIN;
660
661 ret = wait_event_interruptible(sensor_inst->wait,
662 !kfifo_is_empty(&sensor_inst->data_fifo));
663 if (ret)
664 return ret;
665 }
666 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
667 &copied);
668 if (ret)
669 return ret;
670
671 } while (copied == 0);
672
673 return copied;
674}
675
676static int hid_sensor_custom_release(struct inode *inode, struct file *file)
677{
678 struct hid_sensor_custom *sensor_inst;
679
680 sensor_inst = container_of(file->private_data,
681 struct hid_sensor_custom, custom_dev);
682
683 clear_bit(0, &sensor_inst->misc_opened);
684
685 return 0;
686}
687
688static int hid_sensor_custom_open(struct inode *inode, struct file *file)
689{
690 struct hid_sensor_custom *sensor_inst;
691
692 sensor_inst = container_of(file->private_data,
693 struct hid_sensor_custom, custom_dev);
694 /* We essentially have single reader and writer */
695 if (test_and_set_bit(0, &sensor_inst->misc_opened))
696 return -EBUSY;
697
698 return nonseekable_open(inode, file);
699}
700
afc9a42b 701static __poll_t hid_sensor_custom_poll(struct file *file,
4a7de051
SP		 702 struct poll_table_struct *wait)
703{
704 struct hid_sensor_custom *sensor_inst;
afc9a42b 705 __poll_t mask = 0;
4a7de051
SP		 706
707 sensor_inst = container_of(file->private_data,
708 struct hid_sensor_custom, custom_dev);
709
710 poll_wait(file, &sensor_inst->wait, wait);
711
712 if (!kfifo_is_empty(&sensor_inst->data_fifo))
a9a08845 713 mask = EPOLLIN | EPOLLRDNORM;
4a7de051
SP		 714
715 return mask;
716}
717
718static const struct file_operations hid_sensor_custom_fops = {
719 .open = hid_sensor_custom_open,
720 .read = hid_sensor_custom_read,
721 .release = hid_sensor_custom_release,
722 .poll = hid_sensor_custom_poll,
723 .llseek = noop_llseek,
724};
725
726static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
727{
728 int ret;
729
730 ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
731 GFP_KERNEL);
732 if (ret)
733 return ret;
734
735 init_waitqueue_head(&sensor_inst->wait);
736
737 sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
738 sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
739 sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
740 ret = misc_register(&sensor_inst->custom_dev);
741 if (ret) {
742 kfifo_free(&sensor_inst->data_fifo);
743 return ret;
744 }
745 return 0;
746}
747
748static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
749 *sensor_inst)
750{
751 wake_up(&sensor_inst->wait);
752 misc_deregister(&sensor_inst->custom_dev);
753 kfifo_free(&sensor_inst->data_fifo);
754
755}
756
757static int hid_sensor_custom_probe(struct platform_device *pdev)
758{
759 struct hid_sensor_custom *sensor_inst;
760 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
761 int ret;
762
763 sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
764 GFP_KERNEL);
765 if (!sensor_inst)
766 return -ENOMEM;
767
768 sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
769 sensor_inst->callbacks.send_event = hid_sensor_send_event;
770 sensor_inst->callbacks.pdev = pdev;
771 sensor_inst->hsdev = hsdev;
772 sensor_inst->pdev = pdev;
773 mutex_init(&sensor_inst->mutex);
774 platform_set_drvdata(pdev, sensor_inst);
775 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
776 &sensor_inst->callbacks);
777 if (ret < 0) {
778 dev_err(&pdev->dev, "callback reg failed\n");
779 return ret;
780 }
781
782 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
783 &enable_sensor_attr_group);
784 if (ret)
785 goto err_remove_callback;
786
787 ret = hid_sensor_custom_add_attributes(sensor_inst);
788 if (ret)
789 goto err_remove_group;
790
791 ret = hid_sensor_custom_dev_if_add(sensor_inst);
792 if (ret)
793 goto err_remove_attributes;
794
795 return 0;
796
797err_remove_attributes:
798 hid_sensor_custom_remove_attributes(sensor_inst);
799err_remove_group:
800 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
801 &enable_sensor_attr_group);
802err_remove_callback:
803 sensor_hub_remove_callback(hsdev, hsdev->usage);
804
805 return ret;
806}
807
808static int hid_sensor_custom_remove(struct platform_device *pdev)
809{
810 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
811 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
812
813 hid_sensor_custom_dev_if_remove(sensor_inst);
814 hid_sensor_custom_remove_attributes(sensor_inst);
815 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
816 &enable_sensor_attr_group);
817 sensor_hub_remove_callback(hsdev, hsdev->usage);
818
819 return 0;
820}
821
0be2bfdc 822static const struct platform_device_id hid_sensor_custom_ids[] = {
4a7de051
SP		 823 {
824 .name = "HID-SENSOR-2000e1",
825 },
826 {
827 .name = "HID-SENSOR-2000e2",
828 },
829 { /* sentinel */ }
830};
831MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
832
833static struct platform_driver hid_sensor_custom_platform_driver = {
834 .id_table = hid_sensor_custom_ids,
835 .driver = {
836 .name = KBUILD_MODNAME,
837 },
838 .probe = hid_sensor_custom_probe,
839 .remove = hid_sensor_custom_remove,
840};
841module_platform_driver(hid_sensor_custom_platform_driver);
842
843MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
844MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
845MODULE_LICENSE("GPL");
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