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");