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-attributes.h"
  30 #include "hid-sensor-trigger.h"
  31
  32 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
  33                                                 bool state)
  34 {
  35         struct hid_sensor_iio_common *st = trig->private_data;
  36         int state_val;
  37
  38         state_val = state ? 1 : 0;
  39 #if (defined CONFIG_HID_SENSOR_ENUM_BASE_QUIRKS) || \
  40         (defined CONFIG_HID_SENSOR_ENUM_BASE_QUIRKS_MODULE)
  41         ++state_val;
  42 #endif
  43         st->data_ready = state;
  44         sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
  45                                         st->power_state.index,
  46                                         (s32)state_val);
  47
  48         sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
  49                                         st->report_state.index,
  50                                         (s32)state_val);
  51
  52         return 0;
  53 }
  54
  55 void hid_sensor_remove_trigger(struct iio_dev *indio_dev)
  56 {
  57         iio_trigger_unregister(indio_dev->trig);
  58         iio_trigger_free(indio_dev->trig);
  59 }
  60 EXPORT_SYMBOL(hid_sensor_remove_trigger);
  61
  62 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
  63         .owner = THIS_MODULE,
  64         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
  65 };
  66
  67 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
  68                                 struct hid_sensor_iio_common *attrb)
  69 {
  70         int ret;
  71         struct iio_trigger *trig;
  72
  73         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
  74         if (trig == NULL) {
  75                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
  76                 ret = -ENOMEM;
  77                 goto error_ret;
  78         }
  79
  80         trig->dev.parent = indio_dev->dev.parent;
  81         trig->private_data = attrb;
  82         trig->ops = &hid_sensor_trigger_ops;
  83         ret = iio_trigger_register(trig);
  84
  85         if (ret) {
  86                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
  87                 goto error_free_trig;
  88         }
  89         indio_dev->trig = trig;
  90
  91         return ret;
  92
  93 error_free_trig:
  94         iio_trigger_free(trig);
  95 error_ret:
  96         return ret;
  97 }
  98 EXPORT_SYMBOL(hid_sensor_setup_trigger);
  99
 100 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 101 MODULE_DESCRIPTION("HID Sensor trigger processing");
 102 MODULE_LICENSE("GPL");