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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hid / hid-sensor-custom.c
blobfb827c295842f0e4ebe9e81974c513bef9c6638e
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/kernel.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/miscdevice.h>
11 #include <linux/kfifo.h>
12 #include <linux/sched.h>
13 #include <linux/wait.h>
14 #include <linux/poll.h>
15 #include <linux/bsearch.h>
16 #include <linux/platform_device.h>
17 #include <linux/hid-sensor-hub.h>
18
19 #define HID_CUSTOM_NAME_LENGTH 64
20 #define HID_CUSTOM_MAX_CORE_ATTRS 10
21 #define HID_CUSTOM_TOTAL_ATTRS (HID_CUSTOM_MAX_CORE_ATTRS + 1)
22 #define HID_CUSTOM_FIFO_SIZE 4096
23 #define HID_CUSTOM_MAX_FEATURE_BYTES 64
24
25 struct hid_sensor_custom_field {
26 int report_id;
27 char group_name[HID_CUSTOM_NAME_LENGTH];
28 struct hid_sensor_hub_attribute_info attribute;
29 struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS];
30 char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH];
31 struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS];
32 struct attribute_group hid_custom_attribute_group;
33 };
34
35 struct hid_sensor_custom {
36 struct mutex mutex;
37 struct platform_device *pdev;
38 struct hid_sensor_hub_device *hsdev;
39 struct hid_sensor_hub_callbacks callbacks;
40 int sensor_field_count;
41 struct hid_sensor_custom_field *fields;
42 int input_field_count;
43 int input_report_size;
44 int input_report_recd_size;
45 bool input_skip_sample;
46 bool enable;
47 struct hid_sensor_custom_field *power_state;
48 struct hid_sensor_custom_field *report_state;
49 struct miscdevice custom_dev;
50 struct kfifo data_fifo;
51 unsigned long misc_opened;
52 wait_queue_head_t wait;
53 };
54
55 /* Header for each sample to user space via dev interface */
56 struct hid_sensor_sample {
57 u32 usage_id;
58 u64 timestamp;
59 u32 raw_len;
60 } __packed;
61
62 static struct attribute hid_custom_attrs[] = {
63 {.name = "name", .mode = S_IRUGO},
64 {.name = "units", .mode = S_IRUGO},
65 {.name = "unit-expo", .mode = S_IRUGO},
66 {.name = "minimum", .mode = S_IRUGO},
67 {.name = "maximum", .mode = S_IRUGO},
68 {.name = "size", .mode = S_IRUGO},
69 {.name = "value", .mode = S_IWUSR | S_IRUGO},
70 {.name = NULL}
71 };
72
73 static const struct hid_custom_usage_desc {
74 int usage_id;
75 char *desc;
76 } hid_custom_usage_desc_table[] = {
77 {0x200201, "event-sensor-state"},
78 {0x200202, "event-sensor-event"},
79 {0x200301, "property-friendly-name"},
80 {0x200302, "property-persistent-unique-id"},
81 {0x200303, "property-sensor-status"},
82 {0x200304, "property-min-report-interval"},
83 {0x200305, "property-sensor-manufacturer"},
84 {0x200306, "property-sensor-model"},
85 {0x200307, "property-sensor-serial-number"},
86 {0x200308, "property-sensor-description"},
87 {0x200309, "property-sensor-connection-type"},
88 {0x20030A, "property-sensor-device-path"},
89 {0x20030B, "property-hardware-revision"},
90 {0x20030C, "property-firmware-version"},
91 {0x20030D, "property-release-date"},
92 {0x20030E, "property-report-interval"},
93 {0x20030F, "property-change-sensitivity-absolute"},
94 {0x200310, "property-change-sensitivity-percent-range"},
95 {0x200311, "property-change-sensitivity-percent-relative"},
96 {0x200312, "property-accuracy"},
97 {0x200313, "property-resolution"},
98 {0x200314, "property-maximum"},
99 {0x200315, "property-minimum"},
100 {0x200316, "property-reporting-state"},
101 {0x200317, "property-sampling-rate"},
102 {0x200318, "property-response-curve"},
103 {0x200319, "property-power-state"},
104 {0x200540, "data-field-custom"},
105 {0x200541, "data-field-custom-usage"},
106 {0x200542, "data-field-custom-boolean-array"},
107 {0x200543, "data-field-custom-value"},
108 {0x200544, "data-field-custom-value_1"},
109 {0x200545, "data-field-custom-value_2"},
110 {0x200546, "data-field-custom-value_3"},
111 {0x200547, "data-field-custom-value_4"},
112 {0x200548, "data-field-custom-value_5"},
113 {0x200549, "data-field-custom-value_6"},
114 {0x20054A, "data-field-custom-value_7"},
115 {0x20054B, "data-field-custom-value_8"},
116 {0x20054C, "data-field-custom-value_9"},
117 {0x20054D, "data-field-custom-value_10"},
118 {0x20054E, "data-field-custom-value_11"},
119 {0x20054F, "data-field-custom-value_12"},
120 {0x200550, "data-field-custom-value_13"},
121 {0x200551, "data-field-custom-value_14"},
122 {0x200552, "data-field-custom-value_15"},
123 {0x200553, "data-field-custom-value_16"},
124 {0x200554, "data-field-custom-value_17"},
125 {0x200555, "data-field-custom-value_18"},
126 {0x200556, "data-field-custom-value_19"},
127 {0x200557, "data-field-custom-value_20"},
128 {0x200558, "data-field-custom-value_21"},
129 {0x200559, "data-field-custom-value_22"},
130 {0x20055A, "data-field-custom-value_23"},
131 {0x20055B, "data-field-custom-value_24"},
132 {0x20055C, "data-field-custom-value_25"},
133 {0x20055D, "data-field-custom-value_26"},
134 {0x20055E, "data-field-custom-value_27"},
135 {0x20055F, "data-field-custom-value_28"},
136 };
137
138 static int usage_id_cmp(const void *p1, const void *p2)
139 {
140 if (*(int *)p1 < *(int *)p2)
141 return -1;
142
143 if (*(int *)p1 > *(int *)p2)
144 return 1;
145
146 return 0;
147 }
148
149 static ssize_t enable_sensor_show(struct device *dev,
150 struct device_attribute *attr, char *buf)
151 {
152 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
153
154 return sprintf(buf, "%d\n", sensor_inst->enable);
155 }
156
157 static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
158 bool state)
159 {
160 int power_val = -1;
161 int report_val = -1;
162 u32 power_state_usage_id;
163 u32 report_state_usage_id;
164 int ret;
165
166 /*
167 * It is possible that the power/report state ids are not present.
168 * In this case this function will return success. But if the
169 * ids are present, then it will return error if set fails.
170 */
171 if (state) {
172 power_state_usage_id =
173 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
174 report_state_usage_id =
175 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
176 } else {
177 power_state_usage_id =
178 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
179 report_state_usage_id =
180 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
181 }
182
183 if (sensor_inst->power_state)
184 power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
185 sensor_inst->power_state->attribute.report_id,
186 sensor_inst->power_state->attribute.index,
187 power_state_usage_id);
188 if (sensor_inst->report_state)
189 report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
190 sensor_inst->report_state->attribute.report_id,
191 sensor_inst->report_state->attribute.index,
192 report_state_usage_id);
193
194 if (power_val >= 0) {
195 power_val +=
196 sensor_inst->power_state->attribute.logical_minimum;
197 ret = sensor_hub_set_feature(sensor_inst->hsdev,
198 sensor_inst->power_state->attribute.report_id,
199 sensor_inst->power_state->attribute.index,
200 sizeof(power_val),
201 &power_val);
202 if (ret) {
203 hid_err(sensor_inst->hsdev->hdev,
204 "Set power state failed\n");
205 return ret;
206 }
207 }
208
209 if (report_val >= 0) {
210 report_val +=
211 sensor_inst->report_state->attribute.logical_minimum;
212 ret = sensor_hub_set_feature(sensor_inst->hsdev,
213 sensor_inst->report_state->attribute.report_id,
214 sensor_inst->report_state->attribute.index,
215 sizeof(report_val),
216 &report_val);
217 if (ret) {
218 hid_err(sensor_inst->hsdev->hdev,
219 "Set report state failed\n");
220 return ret;
221 }
222 }
223
224 return 0;
225 }
226
227 static ssize_t enable_sensor_store(struct device *dev,
228 struct device_attribute *attr,
229 const char *buf, size_t count)
230 {
231 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
232 int value;
233 int ret = -EINVAL;
234
235 if (kstrtoint(buf, 0, &value) != 0)
236 return -EINVAL;
237
238 mutex_lock(&sensor_inst->mutex);
239 if (value && !sensor_inst->enable) {
240 ret = sensor_hub_device_open(sensor_inst->hsdev);
241 if (ret)
242 goto unlock_state;
243
244 ret = set_power_report_state(sensor_inst, true);
245 if (ret) {
246 sensor_hub_device_close(sensor_inst->hsdev);
247 goto unlock_state;
248 }
249 sensor_inst->enable = true;
250 } else if (!value && sensor_inst->enable) {
251 ret = set_power_report_state(sensor_inst, false);
252 sensor_hub_device_close(sensor_inst->hsdev);
253 sensor_inst->enable = false;
254 }
255 unlock_state:
256 mutex_unlock(&sensor_inst->mutex);
257 if (ret < 0)
258 return ret;
259
260 return count;
261 }
262 static DEVICE_ATTR_RW(enable_sensor);
263
264 static struct attribute *enable_sensor_attrs[] = {
265 &dev_attr_enable_sensor.attr,
266 NULL,
267 };
268
269 static const struct attribute_group enable_sensor_attr_group = {
270 .attrs = enable_sensor_attrs,
271 };
272
273 static ssize_t show_value(struct device *dev, struct device_attribute *attr,
274 char *buf)
275 {
276 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
277 struct hid_sensor_hub_attribute_info *attribute;
278 int index, usage, field_index;
279 char name[HID_CUSTOM_NAME_LENGTH];
280 bool feature = false;
281 bool input = false;
282 int value = 0;
283
284 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
285 name) == 3) {
286 feature = true;
287 field_index = index + sensor_inst->input_field_count;
288 } else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
289 name) == 3) {
290 input = true;
291 field_index = index;
292 } else
293 return -EINVAL;
294
295 if (!strncmp(name, "value", strlen("value"))) {
296 u32 report_id;
297 int ret;
298
299 attribute = &sensor_inst->fields[field_index].attribute;
300 report_id = attribute->report_id;
301 if (feature) {
302 u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
303 int len = 0;
304 u64 value = 0;
305 int i = 0;
306
307 ret = sensor_hub_get_feature(sensor_inst->hsdev,
308 report_id,
309 index,
310 sizeof(values), values);
311 if (ret < 0)
312 return ret;
313
314 while (i < ret) {
315 if (i + attribute->size > ret) {
316 len += snprintf(&buf[len],
317 PAGE_SIZE - len,
318 "%d ", values[i]);
319 break;
320 }
321 switch (attribute->size) {
322 case 2:
323 value = (u64) *(u16 *)&values[i];
324 i += attribute->size;
325 break;
326 case 4:
327 value = (u64) *(u32 *)&values[i];
328 i += attribute->size;
329 break;
330 case 8:
331 value = *(u64 *)&values[i];
332 i += attribute->size;
333 break;
334 default:
335 value = (u64) values[i];
336 ++i;
337 break;
338 }
339 len += snprintf(&buf[len], PAGE_SIZE - len,
340 "%lld ", value);
341 }
342 len += snprintf(&buf[len], PAGE_SIZE - len, "\n");
343
344 return len;
345 } else if (input)
346 value = sensor_hub_input_attr_get_raw_value(
347 sensor_inst->hsdev,
348 sensor_inst->hsdev->usage,
349 usage, report_id,
350 SENSOR_HUB_SYNC, false);
351 } else if (!strncmp(name, "units", strlen("units")))
352 value = sensor_inst->fields[field_index].attribute.units;
353 else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
354 value = sensor_inst->fields[field_index].attribute.unit_expo;
355 else if (!strncmp(name, "size", strlen("size")))
356 value = sensor_inst->fields[field_index].attribute.size;
357 else if (!strncmp(name, "minimum", strlen("minimum")))
358 value = sensor_inst->fields[field_index].attribute.
359 logical_minimum;
360 else if (!strncmp(name, "maximum", strlen("maximum")))
361 value = sensor_inst->fields[field_index].attribute.
362 logical_maximum;
363 else if (!strncmp(name, "name", strlen("name"))) {
364 struct hid_custom_usage_desc *usage_desc;
365
366 usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
367 ARRAY_SIZE(hid_custom_usage_desc_table),
368 sizeof(struct hid_custom_usage_desc),
369 usage_id_cmp);
370 if (usage_desc)
371 return snprintf(buf, PAGE_SIZE, "%s\n",
372 usage_desc->desc);
373 else
374 return sprintf(buf, "not-specified\n");
375 } else
376 return -EINVAL;
377
378 return sprintf(buf, "%d\n", value);
379 }
380
381 static ssize_t store_value(struct device *dev, struct device_attribute *attr,
382 const char *buf, size_t count)
383 {
384 struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
385 int index, field_index, usage;
386 char name[HID_CUSTOM_NAME_LENGTH];
387 int value;
388
389 if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
390 name) == 3) {
391 field_index = index + sensor_inst->input_field_count;
392 } else
393 return -EINVAL;
394
395 if (!strncmp(name, "value", strlen("value"))) {
396 u32 report_id;
397 int ret;
398
399 if (kstrtoint(buf, 0, &value) != 0)
400 return -EINVAL;
401
402 report_id = sensor_inst->fields[field_index].attribute.
403 report_id;
404 ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
405 index, sizeof(value), &value);
406 } else
407 return -EINVAL;
408
409 return count;
410 }
411
412 static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
413 unsigned usage_id, size_t raw_len,
414 char *raw_data, void *priv)
415 {
416 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
417 struct hid_sensor_sample header;
418
419 /* If any error occurs in a sample, rest of the fields are ignored */
420 if (sensor_inst->input_skip_sample) {
421 hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
422 return 0;
423 }
424
425 hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
426 (int) (sensor_inst->input_report_recd_size + raw_len),
427 sensor_inst->input_report_size);
428
429 if (!test_bit(0, &sensor_inst->misc_opened))
430 return 0;
431
432 if (!sensor_inst->input_report_recd_size) {
433 int required_size = sizeof(struct hid_sensor_sample) +
434 sensor_inst->input_report_size;
435 header.usage_id = hsdev->usage;
436 header.raw_len = sensor_inst->input_report_size;
437 header.timestamp = ktime_get_real_ns();
438 if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
439 kfifo_in(&sensor_inst->data_fifo,
440 (unsigned char *)&header,
441 sizeof(header));
442 } else
443 sensor_inst->input_skip_sample = true;
444 }
445 if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
446 kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
447 raw_len);
448
449 sensor_inst->input_report_recd_size += raw_len;
450
451 return 0;
452 }
453
454 static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
455 unsigned usage_id, void *priv)
456 {
457 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
458
459 if (!test_bit(0, &sensor_inst->misc_opened))
460 return 0;
461
462 sensor_inst->input_report_recd_size = 0;
463 sensor_inst->input_skip_sample = false;
464
465 wake_up(&sensor_inst->wait);
466
467 return 0;
468 }
469
470 static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
471 int index, int report_type,
472 struct hid_report *report,
473 struct hid_field *field)
474 {
475 struct hid_sensor_custom_field *sensor_field;
476 void *fields;
477
478 fields = krealloc(sensor_inst->fields,
479 (sensor_inst->sensor_field_count + 1) *
480 sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
481 if (!fields) {
482 kfree(sensor_inst->fields);
483 return -ENOMEM;
484 }
485 sensor_inst->fields = fields;
486 sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
487 sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
488 if (field->logical)
489 sensor_field->attribute.attrib_id = field->logical;
490 else
491 sensor_field->attribute.attrib_id = field->usage[0].hid;
492
493 sensor_field->attribute.index = index;
494 sensor_field->attribute.report_id = report->id;
495 sensor_field->attribute.units = field->unit;
496 sensor_field->attribute.unit_expo = field->unit_exponent;
497 sensor_field->attribute.size = (field->report_size / 8);
498 sensor_field->attribute.logical_minimum = field->logical_minimum;
499 sensor_field->attribute.logical_maximum = field->logical_maximum;
500
501 if (report_type == HID_FEATURE_REPORT)
502 snprintf(sensor_field->group_name,
503 sizeof(sensor_field->group_name), "feature-%x-%x",
504 sensor_field->attribute.index,
505 sensor_field->attribute.attrib_id);
506 else if (report_type == HID_INPUT_REPORT) {
507 snprintf(sensor_field->group_name,
508 sizeof(sensor_field->group_name),
509 "input-%x-%x", sensor_field->attribute.index,
510 sensor_field->attribute.attrib_id);
511 sensor_inst->input_field_count++;
512 sensor_inst->input_report_size += (field->report_size *
513 field->report_count) / 8;
514 }
515
516 memset(&sensor_field->hid_custom_attribute_group, 0,
517 sizeof(struct attribute_group));
518 sensor_inst->sensor_field_count++;
519
520 return 0;
521 }
522
523 static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
524 struct hid_report_enum *report_enum,
525 int report_type)
526 {
527 int i;
528 int ret;
529 struct hid_report *report;
530 struct hid_field *field;
531 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
532
533 list_for_each_entry(report, &report_enum->report_list, list) {
534 for (i = 0; i < report->maxfield; ++i) {
535 field = report->field[i];
536 if (field->maxusage &&
537 ((field->usage[0].collection_index >=
538 hsdev->start_collection_index) &&
539 (field->usage[0].collection_index <
540 hsdev->end_collection_index))) {
541
542 ret = hid_sensor_custom_add_field(sensor_inst,
543 i,
544 report_type,
545 report,
546 field);
547 if (ret)
548 return ret;
549
550 }
551 }
552 }
553
554 return 0;
555 }
556
557 static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
558 *sensor_inst)
559 {
560 struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
561 struct hid_device *hdev = hsdev->hdev;
562 int ret = -1;
563 int i, j;
564
565 for (j = 0; j < HID_REPORT_TYPES; ++j) {
566 if (j == HID_OUTPUT_REPORT)
567 continue;
568
569 ret = hid_sensor_custom_add_fields(sensor_inst,
570 &hdev->report_enum[j], j);
571 if (ret)
572 return ret;
573
574 }
575
576 /* Create sysfs attributes */
577 for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
578 j = 0;
579 while (j < HID_CUSTOM_TOTAL_ATTRS &&
580 hid_custom_attrs[j].name) {
581 struct device_attribute *device_attr;
582
583 device_attr = &sensor_inst->fields[i].sd_attrs[j];
584
585 snprintf((char *)&sensor_inst->fields[i].attr_name[j],
586 HID_CUSTOM_NAME_LENGTH, "%s-%s",
587 sensor_inst->fields[i].group_name,
588 hid_custom_attrs[j].name);
589 sysfs_attr_init(&device_attr->attr);
590 device_attr->attr.name =
591 (char *)&sensor_inst->fields[i].attr_name[j];
592 device_attr->attr.mode = hid_custom_attrs[j].mode;
593 device_attr->show = show_value;
594 if (hid_custom_attrs[j].mode & S_IWUSR)
595 device_attr->store = store_value;
596 sensor_inst->fields[i].attrs[j] = &device_attr->attr;
597 ++j;
598 }
599 sensor_inst->fields[i].attrs[j] = NULL;
600 sensor_inst->fields[i].hid_custom_attribute_group.attrs =
601 sensor_inst->fields[i].attrs;
602 sensor_inst->fields[i].hid_custom_attribute_group.name =
603 sensor_inst->fields[i].group_name;
604 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
605 &sensor_inst->fields[i].
606 hid_custom_attribute_group);
607 if (ret)
608 break;
609
610 /* For power or report field store indexes */
611 if (sensor_inst->fields[i].attribute.attrib_id ==
612 HID_USAGE_SENSOR_PROY_POWER_STATE)
613 sensor_inst->power_state = &sensor_inst->fields[i];
614 else if (sensor_inst->fields[i].attribute.attrib_id ==
615 HID_USAGE_SENSOR_PROP_REPORT_STATE)
616 sensor_inst->report_state = &sensor_inst->fields[i];
617 }
618
619 return ret;
620 }
621
622 static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
623 sensor_inst)
624 {
625 int i;
626
627 for (i = 0; i < sensor_inst->sensor_field_count; ++i)
628 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
629 &sensor_inst->fields[i].
630 hid_custom_attribute_group);
631
632 kfree(sensor_inst->fields);
633 }
634
635 static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
636 size_t count, loff_t *f_ps)
637 {
638 struct hid_sensor_custom *sensor_inst;
639 unsigned int copied;
640 int ret;
641
642 sensor_inst = container_of(file->private_data,
643 struct hid_sensor_custom, custom_dev);
644
645 if (count < sizeof(struct hid_sensor_sample))
646 return -EINVAL;
647
648 do {
649 if (kfifo_is_empty(&sensor_inst->data_fifo)) {
650 if (file->f_flags & O_NONBLOCK)
651 return -EAGAIN;
652
653 ret = wait_event_interruptible(sensor_inst->wait,
654 !kfifo_is_empty(&sensor_inst->data_fifo));
655 if (ret)
656 return ret;
657 }
658 ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
659 &copied);
660 if (ret)
661 return ret;
662
663 } while (copied == 0);
664
665 return copied;
666 }
667
668 static int hid_sensor_custom_release(struct inode *inode, struct file *file)
669 {
670 struct hid_sensor_custom *sensor_inst;
671
672 sensor_inst = container_of(file->private_data,
673 struct hid_sensor_custom, custom_dev);
674
675 clear_bit(0, &sensor_inst->misc_opened);
676
677 return 0;
678 }
679
680 static int hid_sensor_custom_open(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 /* We essentially have single reader and writer */
687 if (test_and_set_bit(0, &sensor_inst->misc_opened))
688 return -EBUSY;
689
690 return stream_open(inode, file);
691 }
692
693 static __poll_t hid_sensor_custom_poll(struct file *file,
694 struct poll_table_struct *wait)
695 {
696 struct hid_sensor_custom *sensor_inst;
697 __poll_t mask = 0;
698
699 sensor_inst = container_of(file->private_data,
700 struct hid_sensor_custom, custom_dev);
701
702 poll_wait(file, &sensor_inst->wait, wait);
703
704 if (!kfifo_is_empty(&sensor_inst->data_fifo))
705 mask = EPOLLIN | EPOLLRDNORM;
706
707 return mask;
708 }
709
710 static const struct file_operations hid_sensor_custom_fops = {
711 .open = hid_sensor_custom_open,
712 .read = hid_sensor_custom_read,
713 .release = hid_sensor_custom_release,
714 .poll = hid_sensor_custom_poll,
715 .llseek = noop_llseek,
716 };
717
718 static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
719 {
720 int ret;
721
722 ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
723 GFP_KERNEL);
724 if (ret)
725 return ret;
726
727 init_waitqueue_head(&sensor_inst->wait);
728
729 sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
730 sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
731 sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
732 ret = misc_register(&sensor_inst->custom_dev);
733 if (ret) {
734 kfifo_free(&sensor_inst->data_fifo);
735 return ret;
736 }
737 return 0;
738 }
739
740 static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
741 *sensor_inst)
742 {
743 wake_up(&sensor_inst->wait);
744 misc_deregister(&sensor_inst->custom_dev);
745 kfifo_free(&sensor_inst->data_fifo);
746
747 }
748
749 static int hid_sensor_custom_probe(struct platform_device *pdev)
750 {
751 struct hid_sensor_custom *sensor_inst;
752 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
753 int ret;
754
755 sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
756 GFP_KERNEL);
757 if (!sensor_inst)
758 return -ENOMEM;
759
760 sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
761 sensor_inst->callbacks.send_event = hid_sensor_send_event;
762 sensor_inst->callbacks.pdev = pdev;
763 sensor_inst->hsdev = hsdev;
764 sensor_inst->pdev = pdev;
765 mutex_init(&sensor_inst->mutex);
766 platform_set_drvdata(pdev, sensor_inst);
767 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
768 &sensor_inst->callbacks);
769 if (ret < 0) {
770 dev_err(&pdev->dev, "callback reg failed\n");
771 return ret;
772 }
773
774 ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
775 &enable_sensor_attr_group);
776 if (ret)
777 goto err_remove_callback;
778
779 ret = hid_sensor_custom_add_attributes(sensor_inst);
780 if (ret)
781 goto err_remove_group;
782
783 ret = hid_sensor_custom_dev_if_add(sensor_inst);
784 if (ret)
785 goto err_remove_attributes;
786
787 return 0;
788
789 err_remove_attributes:
790 hid_sensor_custom_remove_attributes(sensor_inst);
791 err_remove_group:
792 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
793 &enable_sensor_attr_group);
794 err_remove_callback:
795 sensor_hub_remove_callback(hsdev, hsdev->usage);
796
797 return ret;
798 }
799
800 static int hid_sensor_custom_remove(struct platform_device *pdev)
801 {
802 struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
803 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
804
805 hid_sensor_custom_dev_if_remove(sensor_inst);
806 hid_sensor_custom_remove_attributes(sensor_inst);
807 sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
808 &enable_sensor_attr_group);
809 sensor_hub_remove_callback(hsdev, hsdev->usage);
810
811 return 0;
812 }
813
814 static const struct platform_device_id hid_sensor_custom_ids[] = {
815 {
816 .name = "HID-SENSOR-2000e1",
817 },
818 {
819 .name = "HID-SENSOR-2000e2",
820 },
821 { /* sentinel */ }
822 };
823 MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);
824
825 static struct platform_driver hid_sensor_custom_platform_driver = {
826 .id_table = hid_sensor_custom_ids,
827 .driver = {
828 .name = KBUILD_MODNAME,
829 },
830 .probe = hid_sensor_custom_probe,
831 .remove = hid_sensor_custom_remove,
832 };
833 module_platform_driver(hid_sensor_custom_platform_driver);
834
835 MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
836 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
837 MODULE_LICENSE("GPL");
Linux with added FPC-III support