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
  37         if (state) {
  38                 if (sensor_hub_device_open(st->hsdev))
  39                         return -EIO;
  40         } else
  41                 sensor_hub_device_close(st->hsdev);
  42
  43         state_val = state ? 1 : 0;
  44         if (IS_ENABLED(CONFIG_HID_SENSOR_ENUM_BASE_QUIRKS))
  45                 ++state_val;
  46         st->data_ready = state;
  47         sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
  48                                         st->power_state.index,
  49                                         (s32)state_val);
  50
  51         sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
  52                                         st->report_state.index,
  53                                         (s32)state_val);
  54
  55         return 0;
  56 }
  57
  58 void hid_sensor_remove_trigger(struct iio_dev *indio_dev)
  59 {
  60         iio_trigger_unregister(indio_dev->trig);
  61         iio_trigger_free(indio_dev->trig);
  62         indio_dev->trig = NULL;
  63 }
  64 EXPORT_SYMBOL(hid_sensor_remove_trigger);
  65
  66 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
  67         .owner = THIS_MODULE,
  68         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
  69 };
  70
  71 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
  72                                 struct hid_sensor_common *attrb)
  73 {
  74         int ret;
  75         struct iio_trigger *trig;
  76
  77         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
  78         if (trig == NULL) {
  79                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
  80                 ret = -ENOMEM;
  81                 goto error_ret;
  82         }
  83
  84         trig->dev.parent = indio_dev->dev.parent;
  85         iio_trigger_set_drvdata(trig, attrb);
  86         trig->ops = &hid_sensor_trigger_ops;
  87         ret = iio_trigger_register(trig);
  88
  89         if (ret) {
  90                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
  91                 goto error_free_trig;
  92         }
  93         indio_dev->trig = trig;
  94
  95         return ret;
  96
  97 error_free_trig:
  98         iio_trigger_free(trig);
  99 error_ret:
 100         return ret;
 101 }
 102 EXPORT_SYMBOL(hid_sensor_setup_trigger);
 103
 104 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 105 MODULE_DESCRIPTION("HID Sensor trigger processing");
 106 MODULE_LICENSE("GPL");