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 sensor_hub_get_feature(st->hsdev, st->power_state.report_id, 79 st->power_state.index, 80 &state_val); 81 return 0; 82 } 83 EXPORT_SYMBOL(hid_sensor_power_state); 84 85 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig, 86 bool state) 87 { 88 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state); 89 } 90 91 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb) 92 { 93 iio_trigger_unregister(attrb->trigger); 94 iio_trigger_free(attrb->trigger); 95 } 96 EXPORT_SYMBOL(hid_sensor_remove_trigger); 97 98 static const struct iio_trigger_ops hid_sensor_trigger_ops = { 99 .owner = THIS_MODULE, 100 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state, 101 }; 102 103 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name, 104 struct hid_sensor_common *attrb) 105 { 106 int ret; 107 struct iio_trigger *trig; 108 109 trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id); 110 if (trig == NULL) { 111 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n"); 112 ret = -ENOMEM; 113 goto error_ret; 114 } 115 116 trig->dev.parent = indio_dev->dev.parent; 117 iio_trigger_set_drvdata(trig, attrb); 118 trig->ops = &hid_sensor_trigger_ops; 119 ret = iio_trigger_register(trig); 120 121 if (ret) { 122 dev_err(&indio_dev->dev, "Trigger Register Failed\n"); 123 goto error_free_trig; 124 } 125 attrb->trigger = trig; 126 indio_dev->trig = iio_trigger_get(trig); 127 128 return ret; 129 130 error_free_trig: 131 iio_trigger_free(trig); 132 error_ret: 133 return ret; 134 } 135 EXPORT_SYMBOL(hid_sensor_setup_trigger); 136 137 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 138 MODULE_DESCRIPTION("HID Sensor trigger processing"); 139 MODULE_LICENSE("GPL"); 140