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