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