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