summaryrefslogtreecommitdiff
path: root/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
blob: ad8910e6ad59df1e7c306efc72586fd285670363 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
// SPDX-License-Identifier: GPL-2.0-only
/*
 * HID Sensors Driver
 * Copyright (c) 2012, Intel Corporation.
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/workqueue.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/sysfs.h>
#include "hid-sensor-trigger.h"

static ssize_t _hid_sensor_set_report_latency(struct device *dev,
					      struct device_attribute *attr,
					      const char *buf, size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
	int integer, fract, ret;
	int latency;

	ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
	if (ret)
		return ret;

	latency = integer * 1000 + fract / 1000;
	ret = hid_sensor_set_report_latency(attrb, latency);
	if (ret < 0)
		return len;

	attrb->latency_ms = hid_sensor_get_report_latency(attrb);

	return len;
}

static ssize_t _hid_sensor_get_report_latency(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
	int latency;

	latency = hid_sensor_get_report_latency(attrb);
	if (latency < 0)
		return latency;

	return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
}

static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
	int latency;

	latency = hid_sensor_get_report_latency(attrb);
	if (latency < 0)
		return latency;

	return sprintf(buf, "%d\n", !!latency);
}

static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
		       _hid_sensor_get_report_latency,
		       _hid_sensor_set_report_latency, 0);
static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
		       _hid_sensor_get_fifo_state, NULL, 0);

static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {
	&iio_dev_attr_hwfifo_timeout,
	&iio_dev_attr_hwfifo_enabled,
	NULL,
};

static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
{
	int state_val;
	int report_val;
	s32 poll_value = 0;

	if (state) {
		if (sensor_hub_device_open(st->hsdev))
			return -EIO;

		atomic_inc(&st->data_ready);

		state_val = hid_sensor_get_usage_index(st->hsdev,
			st->power_state.report_id,
			st->power_state.index,
			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
		report_val = hid_sensor_get_usage_index(st->hsdev,
			st->report_state.report_id,
			st->report_state.index,
			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);

		poll_value = hid_sensor_read_poll_value(st);
	} else {
		int val;

		val = atomic_dec_if_positive(&st->data_ready);
		if (val < 0)
			return 0;

		sensor_hub_device_close(st->hsdev);
		state_val = hid_sensor_get_usage_index(st->hsdev,
			st->power_state.report_id,
			st->power_state.index,
			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
		report_val = hid_sensor_get_usage_index(st->hsdev,
			st->report_state.report_id,
			st->report_state.index,
			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
	}

	if (state_val >= 0) {
		state_val += st->power_state.logical_minimum;
		sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
				       st->power_state.index, sizeof(state_val),
				       &state_val);
	}

	if (report_val >= 0) {
		report_val += st->report_state.logical_minimum;
		sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
				       st->report_state.index,
				       sizeof(report_val),
				       &report_val);
	}

	pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
		 st->pdev->name, state_val, report_val);

	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
			       st->power_state.index,
			       sizeof(state_val), &state_val);
	if (state && poll_value)
		msleep_interruptible(poll_value * 2);

	return 0;
}
EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);

int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
{

#ifdef CONFIG_PM
	int ret;

	if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
		pm_runtime_enable(&st->pdev->dev);

	if (state) {
		atomic_inc(&st->user_requested_state);
		ret = pm_runtime_resume_and_get(&st->pdev->dev);
	} else {
		atomic_dec(&st->user_requested_state);
		pm_runtime_mark_last_busy(&st->pdev->dev);
		pm_runtime_use_autosuspend(&st->pdev->dev);
		ret = pm_runtime_put_autosuspend(&st->pdev->dev);
	}
	if (ret < 0)
		return ret;

	return 0;
#else
	atomic_set(&st->user_requested_state, state);
	return _hid_sensor_power_state(st, state);
#endif
}

static void hid_sensor_set_power_work(struct work_struct *work)
{
	struct hid_sensor_common *attrb = container_of(work,
						       struct hid_sensor_common,
						       work);

	if (attrb->poll_interval >= 0)
		sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
				       attrb->poll.index,
				       sizeof(attrb->poll_interval),
				       &attrb->poll_interval);

	if (attrb->raw_hystersis >= 0)
		sensor_hub_set_feature(attrb->hsdev,
				       attrb->sensitivity.report_id,
				       attrb->sensitivity.index,
				       sizeof(attrb->raw_hystersis),
				       &attrb->raw_hystersis);

	if (attrb->latency_ms > 0)
		hid_sensor_set_report_latency(attrb, attrb->latency_ms);

	if (atomic_read(&attrb->user_requested_state))
		_hid_sensor_power_state(attrb, true);
}

static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
						bool state)
{
	return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
}

void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
			       struct hid_sensor_common *attrb)
{
	if (atomic_read(&attrb->runtime_pm_enable))
		pm_runtime_disable(&attrb->pdev->dev);

	pm_runtime_set_suspended(&attrb->pdev->dev);

	cancel_work_sync(&attrb->work);
	iio_trigger_unregister(attrb->trigger);
	iio_trigger_free(attrb->trigger);
	iio_triggered_buffer_cleanup(indio_dev);
}
EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);

static const struct iio_trigger_ops hid_sensor_trigger_ops = {
	.set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
};

int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
				struct hid_sensor_common *attrb)
{
	const struct iio_dev_attr **fifo_attrs;
	int ret;
	struct iio_trigger *trig;

	if (hid_sensor_batch_mode_supported(attrb))
		fifo_attrs = hid_sensor_fifo_attributes;
	else
		fifo_attrs = NULL;

	ret = iio_triggered_buffer_setup_ext(indio_dev,
					     &iio_pollfunc_store_time, NULL,
					     IIO_BUFFER_DIRECTION_IN,
					     NULL, fifo_attrs);
	if (ret) {
		dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
		return ret;
	}

	trig = iio_trigger_alloc(indio_dev->dev.parent,
				 "%s-dev%d", name, iio_device_id(indio_dev));
	if (trig == NULL) {
		dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
		ret = -ENOMEM;
		goto error_triggered_buffer_cleanup;
	}

	iio_trigger_set_drvdata(trig, attrb);
	trig->ops = &hid_sensor_trigger_ops;
	ret = iio_trigger_register(trig);

	if (ret) {
		dev_err(&indio_dev->dev, "Trigger Register Failed\n");
		goto error_free_trig;
	}
	attrb->trigger = trig;
	indio_dev->trig = iio_trigger_get(trig);

	ret = pm_runtime_set_active(&indio_dev->dev);
	if (ret)
		goto error_unreg_trigger;

	iio_device_set_drvdata(indio_dev, attrb);

	INIT_WORK(&attrb->work, hid_sensor_set_power_work);

	pm_suspend_ignore_children(&attrb->pdev->dev, true);
	/* Default to 3 seconds, but can be changed from sysfs */
	pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
					 3000);
	return ret;
error_unreg_trigger:
	iio_trigger_unregister(trig);
error_free_trig:
	iio_trigger_free(trig);
error_triggered_buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
	return ret;
}
EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);

static int __maybe_unused hid_sensor_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);

	return _hid_sensor_power_state(attrb, false);
}

static int __maybe_unused hid_sensor_resume(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
	schedule_work(&attrb->work);
	return 0;
}

static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
	return _hid_sensor_power_state(attrb, true);
}

const struct dev_pm_ops hid_sensor_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
	SET_RUNTIME_PM_OPS(hid_sensor_suspend,
			   hid_sensor_runtime_resume, NULL)
};
EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_DESCRIPTION("HID Sensor trigger processing");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);