Linux-libre 4.4.62-gnu
[librecmc/linux-libre.git] / drivers / iio / common / hid-sensors / hid-sensor-trigger.c
1 /*
2  * HID Sensors Driver
3  * Copyright (c) 2012, 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  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17  *
18  */
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/slab.h>
25 #include <linux/delay.h>
26 #include <linux/hid-sensor-hub.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/sysfs.h>
30 #include "hid-sensor-trigger.h"
31
32 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
33 {
34         int state_val;
35         int report_val;
36         s32 poll_value = 0;
37
38         if (state) {
39                 if (!atomic_read(&st->user_requested_state))
40                         return 0;
41                 if (sensor_hub_device_open(st->hsdev))
42                         return -EIO;
43
44                 atomic_inc(&st->data_ready);
45
46                 state_val = hid_sensor_get_usage_index(st->hsdev,
47                         st->power_state.report_id,
48                         st->power_state.index,
49                         HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
50                 report_val = hid_sensor_get_usage_index(st->hsdev,
51                         st->report_state.report_id,
52                         st->report_state.index,
53                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
54         } else {
55                 int val;
56
57                 val = atomic_dec_if_positive(&st->data_ready);
58                 if (val < 0)
59                         return 0;
60
61                 sensor_hub_device_close(st->hsdev);
62                 state_val = hid_sensor_get_usage_index(st->hsdev,
63                         st->power_state.report_id,
64                         st->power_state.index,
65                         HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
66                 report_val = hid_sensor_get_usage_index(st->hsdev,
67                         st->report_state.report_id,
68                         st->report_state.index,
69                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
70         }
71
72         if (state_val >= 0) {
73                 state_val += st->power_state.logical_minimum;
74                 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
75                                        st->power_state.index, sizeof(state_val),
76                                        &state_val);
77         }
78
79         if (report_val >= 0) {
80                 report_val += st->report_state.logical_minimum;
81                 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
82                                        st->report_state.index,
83                                        sizeof(report_val),
84                                        &report_val);
85         }
86
87         sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
88                                st->power_state.index,
89                                sizeof(state_val), &state_val);
90         if (state)
91                 poll_value = hid_sensor_read_poll_value(st);
92         if (poll_value > 0)
93                 msleep_interruptible(poll_value * 2);
94
95         return 0;
96 }
97 EXPORT_SYMBOL(hid_sensor_power_state);
98
99 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
100 {
101
102 #ifdef CONFIG_PM
103         int ret;
104
105         atomic_set(&st->user_requested_state, state);
106         if (state)
107                 ret = pm_runtime_get_sync(&st->pdev->dev);
108         else {
109                 pm_runtime_mark_last_busy(&st->pdev->dev);
110                 ret = pm_runtime_put_autosuspend(&st->pdev->dev);
111         }
112         if (ret < 0) {
113                 if (state)
114                         pm_runtime_put_noidle(&st->pdev->dev);
115                 return ret;
116         }
117
118         return 0;
119 #else
120         atomic_set(&st->user_requested_state, state);
121         return _hid_sensor_power_state(st, state);
122 #endif
123 }
124
125 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
126                                                 bool state)
127 {
128         return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
129 }
130
131 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
132 {
133         iio_trigger_unregister(attrb->trigger);
134         iio_trigger_free(attrb->trigger);
135 }
136 EXPORT_SYMBOL(hid_sensor_remove_trigger);
137
138 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
139         .owner = THIS_MODULE,
140         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
141 };
142
143 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
144                                 struct hid_sensor_common *attrb)
145 {
146         int ret;
147         struct iio_trigger *trig;
148
149         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
150         if (trig == NULL) {
151                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
152                 ret = -ENOMEM;
153                 goto error_ret;
154         }
155
156         trig->dev.parent = indio_dev->dev.parent;
157         iio_trigger_set_drvdata(trig, attrb);
158         trig->ops = &hid_sensor_trigger_ops;
159         ret = iio_trigger_register(trig);
160
161         if (ret) {
162                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
163                 goto error_free_trig;
164         }
165         attrb->trigger = trig;
166         indio_dev->trig = iio_trigger_get(trig);
167
168         ret = pm_runtime_set_active(&indio_dev->dev);
169         if (ret)
170                 goto error_unreg_trigger;
171
172         iio_device_set_drvdata(indio_dev, attrb);
173         pm_suspend_ignore_children(&attrb->pdev->dev, true);
174         pm_runtime_enable(&attrb->pdev->dev);
175         /* Default to 3 seconds, but can be changed from sysfs */
176         pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
177                                          3000);
178         pm_runtime_use_autosuspend(&attrb->pdev->dev);
179
180         return ret;
181 error_unreg_trigger:
182         iio_trigger_unregister(trig);
183 error_free_trig:
184         iio_trigger_free(trig);
185 error_ret:
186         return ret;
187 }
188 EXPORT_SYMBOL(hid_sensor_setup_trigger);
189
190 #ifdef CONFIG_PM
191 static int hid_sensor_suspend(struct device *dev)
192 {
193         struct platform_device *pdev = to_platform_device(dev);
194         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
195         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
196
197         return _hid_sensor_power_state(attrb, false);
198 }
199
200 static int hid_sensor_resume(struct device *dev)
201 {
202         struct platform_device *pdev = to_platform_device(dev);
203         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
204         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
205
206         return _hid_sensor_power_state(attrb, true);
207 }
208
209 #endif
210
211 const struct dev_pm_ops hid_sensor_pm_ops = {
212         SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
213         SET_RUNTIME_PM_OPS(hid_sensor_suspend,
214                            hid_sensor_resume, NULL)
215 };
216 EXPORT_SYMBOL(hid_sensor_pm_ops);
217
218 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
219 MODULE_DESCRIPTION("HID Sensor trigger processing");
220 MODULE_LICENSE("GPL");