summaryrefslogtreecommitdiff
path: root/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
blob: 5b41f9d0d4f3d805b927a6f3bcee9cb85ece1e3f (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
/*
 * HID Sensors Driver
 * Copyright (c) 2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/sysfs.h>
#include "hid-sensor-trigger.h"

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 (!atomic_read(&st->user_requested_state))
			return 0;
		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);
	}

	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(hid_sensor_power_state);

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

#ifdef CONFIG_PM
	int ret;

	atomic_set(&st->user_requested_state, state);
	if (state)
		ret = pm_runtime_get_sync(&st->pdev->dev);
	else {
		pm_runtime_mark_last_busy(&st->pdev->dev);
		ret = pm_runtime_put_autosuspend(&st->pdev->dev);
	}
	if (ret < 0) {
		if (state)
			pm_runtime_put_noidle(&st->pdev->dev);
		return ret;
	}

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

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 hid_sensor_common *attrb)
{
	iio_trigger_unregister(attrb->trigger);
	iio_trigger_free(attrb->trigger);
}
EXPORT_SYMBOL(hid_sensor_remove_trigger);

static const struct iio_trigger_ops hid_sensor_trigger_ops = {
	.owner = THIS_MODULE,
	.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)
{
	int ret;
	struct iio_trigger *trig;

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

	trig->dev.parent = indio_dev->dev.parent;
	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);
	pm_suspend_ignore_children(&attrb->pdev->dev, true);
	pm_runtime_enable(&attrb->pdev->dev);
	/* Default to 3 seconds, but can be changed from sysfs */
	pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
					 3000);
	pm_runtime_use_autosuspend(&attrb->pdev->dev);

	return ret;
error_unreg_trigger:
	iio_trigger_unregister(trig);
error_free_trig:
	iio_trigger_free(trig);
error_ret:
	return ret;
}
EXPORT_SYMBOL(hid_sensor_setup_trigger);

#ifdef CONFIG_PM
static int hid_sensor_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);

	return _hid_sensor_power_state(attrb, false);
}

static int hid_sensor_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);

	return _hid_sensor_power_state(attrb, true);
}

#endif

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_resume, NULL)
};
EXPORT_SYMBOL(hid_sensor_pm_ops);

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