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