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 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
  32 {
  33         int state_val;
  34         int report_val;
  35
  36         if (state) {
  37                 if (sensor_hub_device_open(st->hsdev))
  38                         return -EIO;
  39
  40                 atomic_inc(&st->data_ready);
  41
  42                 state_val = hid_sensor_get_usage_index(st->hsdev,
  43                         st->power_state.report_id,
  44                         st->power_state.index,
  45                         HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
  46                 report_val = hid_sensor_get_usage_index(st->hsdev,
  47                         st->report_state.report_id,
  48                         st->report_state.index,
  49                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
  50         } else {
  51                 if (!atomic_dec_and_test(&st->data_ready))
  52                         return 0;
  53                 sensor_hub_device_close(st->hsdev);
  54                 state_val = hid_sensor_get_usage_index(st->hsdev,
  55                         st->power_state.report_id,
  56                         st->power_state.index,
  57                         HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
  58                 report_val = hid_sensor_get_usage_index(st->hsdev,
  59                         st->report_state.report_id,
  60                         st->report_state.index,
  61                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
  62         }
  63
  64         if (state_val >= 0) {
  65                 state_val += st->power_state.logical_minimum;
  66                 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
  67                                         st->power_state.index,
  68                                         (s32)state_val);
  69         }
  70
  71         if (report_val >= 0) {
  72                 report_val += st->report_state.logical_minimum;
  73                 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
  74                                         st->report_state.index,
  75                                         (s32)report_val);
  76         }
  77
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(hid_sensor_power_state);
  81
  82 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
  83                                                 bool state)
  84 {
  85         return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
  86 }
  87
  88 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
  89 {
  90         iio_trigger_unregister(attrb->trigger);
  91         iio_trigger_free(attrb->trigger);
  92 }
  93 EXPORT_SYMBOL(hid_sensor_remove_trigger);
  94
  95 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
  96         .owner = THIS_MODULE,
  97         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
  98 };
  99
 100 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 101                                 struct hid_sensor_common *attrb)
 102 {
 103         int ret;
 104         struct iio_trigger *trig;
 105
 106         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
 107         if (trig == NULL) {
 108                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
 109                 ret = -ENOMEM;
 110                 goto error_ret;
 111         }
 112
 113         trig->dev.parent = indio_dev->dev.parent;
 114         iio_trigger_set_drvdata(trig, attrb);
 115         trig->ops = &hid_sensor_trigger_ops;
 116         ret = iio_trigger_register(trig);
 117
 118         if (ret) {
 119                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
 120                 goto error_free_trig;
 121         }
 122         indio_dev->trig = attrb->trigger = trig;
 123
 124         return ret;
 125
 126 error_free_trig:
 127         iio_trigger_free(trig);
 128 error_ret:
 129         return ret;
 130 }
 131 EXPORT_SYMBOL(hid_sensor_setup_trigger);
 132
 133 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 134 MODULE_DESCRIPTION("HID Sensor trigger processing");
 135 MODULE_LICENSE("GPL");