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
  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 void hid_sensor_set_power_work(struct work_struct *work)
 126 {
 127         struct hid_sensor_common *attrb = container_of(work,
 128                                                        struct hid_sensor_common,
 129                                                        work);
 130         _hid_sensor_power_state(attrb, true);
 131 }
 132
 133 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
 134                                                 bool state)
 135 {
 136         return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
 137 }
 138
 139 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
 140 {
 141         cancel_work_sync(&attrb->work);
 142         iio_trigger_unregister(attrb->trigger);
 143         iio_trigger_free(attrb->trigger);
 144 }
 145 EXPORT_SYMBOL(hid_sensor_remove_trigger);
 146
 147 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
 148         .owner = THIS_MODULE,
 149         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
 150 };
 151
 152 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 153                                 struct hid_sensor_common *attrb)
 154 {
 155         int ret;
 156         struct iio_trigger *trig;
 157
 158         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
 159         if (trig == NULL) {
 160                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
 161                 ret = -ENOMEM;
 162                 goto error_ret;
 163         }
 164
 165         trig->dev.parent = indio_dev->dev.parent;
 166         iio_trigger_set_drvdata(trig, attrb);
 167         trig->ops = &hid_sensor_trigger_ops;
 168         ret = iio_trigger_register(trig);
 169
 170         if (ret) {
 171                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
 172                 goto error_free_trig;
 173         }
 174         attrb->trigger = trig;
 175         indio_dev->trig = iio_trigger_get(trig);
 176
 177         ret = pm_runtime_set_active(&indio_dev->dev);
 178         if (ret)
 179                 goto error_unreg_trigger;
 180
 181         iio_device_set_drvdata(indio_dev, attrb);
 182
 183         INIT_WORK(&attrb->work, hid_sensor_set_power_work);
 184
 185         pm_suspend_ignore_children(&attrb->pdev->dev, true);
 186         pm_runtime_enable(&attrb->pdev->dev);
 187         /* Default to 3 seconds, but can be changed from sysfs */
 188         pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
 189                                          3000);
 190         pm_runtime_use_autosuspend(&attrb->pdev->dev);
 191
 192         return ret;
 193 error_unreg_trigger:
 194         iio_trigger_unregister(trig);
 195 error_free_trig:
 196         iio_trigger_free(trig);
 197 error_ret:
 198         return ret;
 199 }
 200 EXPORT_SYMBOL(hid_sensor_setup_trigger);
 201
 202 static int __maybe_unused hid_sensor_suspend(struct device *dev)
 203 {
 204         struct platform_device *pdev = to_platform_device(dev);
 205         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 206         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 207
 208         return _hid_sensor_power_state(attrb, false);
 209 }
 210
 211 static int __maybe_unused hid_sensor_resume(struct device *dev)
 212 {
 213         struct platform_device *pdev = to_platform_device(dev);
 214         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 215         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 216         schedule_work(&attrb->work);
 217         return 0;
 218 }
 219
 220 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
 221 {
 222         struct platform_device *pdev = to_platform_device(dev);
 223         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 224         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 225         return _hid_sensor_power_state(attrb, true);
 226 }
 227
 228 const struct dev_pm_ops hid_sensor_pm_ops = {
 229         SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
 230         SET_RUNTIME_PM_OPS(hid_sensor_suspend,
 231                            hid_sensor_runtime_resume, NULL)
 232 };
 233 EXPORT_SYMBOL(hid_sensor_pm_ops);
 234
 235 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 236 MODULE_DESCRIPTION("HID Sensor trigger processing");
 237 MODULE_LICENSE("GPL");