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/hid-sensor-hub.h>
  26 #include <linux/iio/iio.h>
  27 #include <linux/iio/trigger.h>
  28 #include <linux/iio/sysfs.h>
  29 #include "hid-sensor-trigger.h"
  30
  31 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
  32                                                 bool state)
  33 {
  34         struct hid_sensor_common *st = iio_trigger_get_drvdata(trig);
  35         int state_val;
  36         int report_val;
  37
  38         if (state) {
  39                 if (sensor_hub_device_open(st->hsdev))
  40                         return -EIO;
  41                 state_val = hid_sensor_get_usage_index(st->hsdev,
  42                         st->power_state.report_id,
  43                         st->power_state.index,
  44                         HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
  45                 report_val = hid_sensor_get_usage_index(st->hsdev,
  46                         st->report_state.report_id,
  47                         st->report_state.index,
  48                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
  49         } else {
  50                 sensor_hub_device_close(st->hsdev);
  51                 state_val = hid_sensor_get_usage_index(st->hsdev,
  52                         st->power_state.report_id,
  53                         st->power_state.index,
  54                         HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
  55                 report_val = hid_sensor_get_usage_index(st->hsdev,
  56                         st->report_state.report_id,
  57                         st->report_state.index,
  58                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
  59         }
  60         st->data_ready = state;
  61
  62         if (state_val >= 0) {
  63                 state_val += st->power_state.logical_minimum;
  64                 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
  65                                         st->power_state.index,
  66                                         (s32)state_val);
  67         }
  68
  69         if (report_val >= 0) {
  70                 report_val += st->report_state.logical_minimum;
  71                 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
  72                                         st->report_state.index,
  73                                         (s32)report_val);
  74         }
  75
  76         return 0;
  77 }
  78
  79 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
  80 {
  81         iio_trigger_unregister(attrb->trigger);
  82         iio_trigger_free(attrb->trigger);
  83 }
  84 EXPORT_SYMBOL(hid_sensor_remove_trigger);
  85
  86 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
  87         .owner = THIS_MODULE,
  88         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
  89 };
  90
  91 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
  92                                 struct hid_sensor_common *attrb)
  93 {
  94         int ret;
  95         struct iio_trigger *trig;
  96
  97         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
  98         if (trig == NULL) {
  99                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
 100                 ret = -ENOMEM;
 101                 goto error_ret;
 102         }
 103
 104         trig->dev.parent = indio_dev->dev.parent;
 105         iio_trigger_set_drvdata(trig, attrb);
 106         trig->ops = &hid_sensor_trigger_ops;
 107         ret = iio_trigger_register(trig);
 108
 109         if (ret) {
 110                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
 111                 goto error_free_trig;
 112         }
 113         indio_dev->trig = attrb->trigger = trig;
 114
 115         return ret;
 116
 117 error_free_trig:
 118         iio_trigger_free(trig);
 119 error_ret:
 120         return ret;
 121 }
 122 EXPORT_SYMBOL(hid_sensor_setup_trigger);
 123
 124 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 125 MODULE_DESCRIPTION("HID Sensor trigger processing");
 126 MODULE_LICENSE("GPL");