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
  37        state_val = state ? 1 : 0;
  38        if (IS_ENABLED(CONFIG_HID_SENSOR_ENUM_BASE_QUIRKS))
  39                ++state_val;
  40        st->data_ready = state;
  41        sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
  42                                        st->power_state.index,
  43                                        (s32)state_val);
  44
  45        sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
  46                                        st->report_state.index,
  47                                        (s32)state_val);
  48
  49        return 0;
  50}
  51
  52void hid_sensor_remove_trigger(struct iio_dev *indio_dev)
  53{
  54        iio_trigger_unregister(indio_dev->trig);
  55        iio_trigger_free(indio_dev->trig);
  56        indio_dev->trig = NULL;
  57}
  58EXPORT_SYMBOL(hid_sensor_remove_trigger);
  59
  60static const struct iio_trigger_ops hid_sensor_trigger_ops = {
  61        .owner = THIS_MODULE,
  62        .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
  63};
  64
  65int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
  66                                struct hid_sensor_common *attrb)
  67{
  68        int ret;
  69        struct iio_trigger *trig;
  70
  71        trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
  72        if (trig == NULL) {
  73                dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
  74                ret = -ENOMEM;
  75                goto error_ret;
  76        }
  77
  78        trig->dev.parent = indio_dev->dev.parent;
  79        iio_trigger_set_drvdata(trig, attrb);
  80        trig->ops = &hid_sensor_trigger_ops;
  81        ret = iio_trigger_register(trig);
  82
  83        if (ret) {
  84                dev_err(&indio_dev->dev, "Trigger Register Failed\n");
  85                goto error_free_trig;
  86        }
  87        indio_dev->trig = trig;
  88
  89        return ret;
  90
  91error_free_trig:
  92        iio_trigger_free(trig);
  93error_ret:
  94        return ret;
  95}
  96EXPORT_SYMBOL(hid_sensor_setup_trigger);
  97
  98MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
  99MODULE_DESCRIPTION("HID Sensor trigger processing");
 100MODULE_LICENSE("GPL");
 101