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 
55 		poll_value = hid_sensor_read_poll_value(st);
56 	} else {
57 		int val;
58 
59 		val = atomic_dec_if_positive(&st->data_ready);
60 		if (val < 0)
61 			return 0;
62 
63 		sensor_hub_device_close(st->hsdev);
64 		state_val = hid_sensor_get_usage_index(st->hsdev,
65 			st->power_state.report_id,
66 			st->power_state.index,
67 			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
68 		report_val = hid_sensor_get_usage_index(st->hsdev,
69 			st->report_state.report_id,
70 			st->report_state.index,
71 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
72 	}
73 
74 	if (state_val >= 0) {
75 		state_val += st->power_state.logical_minimum;
76 		sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
77 				       st->power_state.index, sizeof(state_val),
78 				       &state_val);
79 	}
80 
81 	if (report_val >= 0) {
82 		report_val += st->report_state.logical_minimum;
83 		sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
84 				       st->report_state.index,
85 				       sizeof(report_val),
86 				       &report_val);
87 	}
88 
89 	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
90 			       st->power_state.index,
91 			       sizeof(state_val), &state_val);
92 	if (state && poll_value)
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");
221