common/hid-sensors/hid-sensor-trigger.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * HID Sensors Driver
0004  * Copyright (c) 2012, Intel Corporation.
0005  */
0006 #include <linux/device.h>
0007 #include <linux/platform_device.h>
0008 #include <linux/module.h>
0009 #include <linux/delay.h>
0010 #include <linux/hid-sensor-hub.h>
0011 #include <linux/workqueue.h>
0012 #include <linux/iio/iio.h>
0013 #include <linux/iio/trigger.h>
0014 #include <linux/iio/triggered_buffer.h>
0015 #include <linux/iio/trigger_consumer.h>
0016 #include <linux/iio/sysfs.h>
0017 #include "hid-sensor-trigger.h"
0018
0019 static ssize_t _hid_sensor_set_report_latency(struct device *dev,
0020                           struct device_attribute *attr,
0021                           const char *buf, size_t len)
0022 {
0023     struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0024     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0025     int integer, fract, ret;
0026     int latency;
0027
0028     ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
0029     if (ret)
0030         return ret;
0031
0032     latency = integer * 1000 + fract / 1000;
0033     ret = hid_sensor_set_report_latency(attrb, latency);
0034     if (ret < 0)
0035         return len;
0036
0037     attrb->latency_ms = hid_sensor_get_report_latency(attrb);
0038
0039     return len;
0040 }
0041
0042 static ssize_t _hid_sensor_get_report_latency(struct device *dev,
0043                           struct device_attribute *attr,
0044                           char *buf)
0045 {
0046     struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0047     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0048     int latency;
0049
0050     latency = hid_sensor_get_report_latency(attrb);
0051     if (latency < 0)
0052         return latency;
0053
0054     return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
0055 }
0056
0057 static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
0058                       struct device_attribute *attr,
0059                       char *buf)
0060 {
0061     struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0062     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0063     int latency;
0064
0065     latency = hid_sensor_get_report_latency(attrb);
0066     if (latency < 0)
0067         return latency;
0068
0069     return sprintf(buf, "%d\n", !!latency);
0070 }
0071
0072 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
0073                _hid_sensor_get_report_latency,
0074                _hid_sensor_set_report_latency, 0);
0075 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
0076                _hid_sensor_get_fifo_state, NULL, 0);
0077
0078 static const struct attribute *hid_sensor_fifo_attributes[] = {
0079     &iio_dev_attr_hwfifo_timeout.dev_attr.attr,
0080     &iio_dev_attr_hwfifo_enabled.dev_attr.attr,
0081     NULL,
0082 };
0083
0084 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
0085 {
0086     int state_val;
0087     int report_val;
0088     s32 poll_value = 0;
0089
0090     if (state) {
0091         if (sensor_hub_device_open(st->hsdev))
0092             return -EIO;
0093
0094         atomic_inc(&st->data_ready);
0095
0096         state_val = hid_sensor_get_usage_index(st->hsdev,
0097             st->power_state.report_id,
0098             st->power_state.index,
0099             HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
0100         report_val = hid_sensor_get_usage_index(st->hsdev,
0101             st->report_state.report_id,
0102             st->report_state.index,
0103             HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
0104
0105         poll_value = hid_sensor_read_poll_value(st);
0106     } else {
0107         int val;
0108
0109         val = atomic_dec_if_positive(&st->data_ready);
0110         if (val < 0)
0111             return 0;
0112
0113         sensor_hub_device_close(st->hsdev);
0114         state_val = hid_sensor_get_usage_index(st->hsdev,
0115             st->power_state.report_id,
0116             st->power_state.index,
0117             HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
0118         report_val = hid_sensor_get_usage_index(st->hsdev,
0119             st->report_state.report_id,
0120             st->report_state.index,
0121             HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
0122     }
0123
0124     if (state_val >= 0) {
0125         state_val += st->power_state.logical_minimum;
0126         sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
0127                        st->power_state.index, sizeof(state_val),
0128                        &state_val);
0129     }
0130
0131     if (report_val >= 0) {
0132         report_val += st->report_state.logical_minimum;
0133         sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
0134                        st->report_state.index,
0135                        sizeof(report_val),
0136                        &report_val);
0137     }
0138
0139     pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
0140          st->pdev->name, state_val, report_val);
0141
0142     sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
0143                    st->power_state.index,
0144                    sizeof(state_val), &state_val);
0145     if (state && poll_value)
0146         msleep_interruptible(poll_value * 2);
0147
0148     return 0;
0149 }
0150 EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);
0151
0152 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
0153 {
0154
0155 #ifdef CONFIG_PM
0156     int ret;
0157
0158     if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
0159         pm_runtime_enable(&st->pdev->dev);
0160
0161     if (state) {
0162         atomic_inc(&st->user_requested_state);
0163         ret = pm_runtime_resume_and_get(&st->pdev->dev);
0164     } else {
0165         atomic_dec(&st->user_requested_state);
0166         pm_runtime_mark_last_busy(&st->pdev->dev);
0167         pm_runtime_use_autosuspend(&st->pdev->dev);
0168         ret = pm_runtime_put_autosuspend(&st->pdev->dev);
0169     }
0170     if (ret < 0)
0171         return ret;
0172
0173     return 0;
0174 #else
0175     atomic_set(&st->user_requested_state, state);
0176     return _hid_sensor_power_state(st, state);
0177 #endif
0178 }
0179
0180 static void hid_sensor_set_power_work(struct work_struct *work)
0181 {
0182     struct hid_sensor_common *attrb = container_of(work,
0183                                struct hid_sensor_common,
0184                                work);
0185
0186     if (attrb->poll_interval >= 0)
0187         sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
0188                        attrb->poll.index,
0189                        sizeof(attrb->poll_interval),
0190                        &attrb->poll_interval);
0191
0192     if (attrb->raw_hystersis >= 0)
0193         sensor_hub_set_feature(attrb->hsdev,
0194                        attrb->sensitivity.report_id,
0195                        attrb->sensitivity.index,
0196                        sizeof(attrb->raw_hystersis),
0197                        &attrb->raw_hystersis);
0198
0199     if (attrb->latency_ms > 0)
0200         hid_sensor_set_report_latency(attrb, attrb->latency_ms);
0201
0202     if (atomic_read(&attrb->user_requested_state))
0203         _hid_sensor_power_state(attrb, true);
0204 }
0205
0206 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
0207                         bool state)
0208 {
0209     return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
0210 }
0211
0212 void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
0213                    struct hid_sensor_common *attrb)
0214 {
0215     if (atomic_read(&attrb->runtime_pm_enable))
0216         pm_runtime_disable(&attrb->pdev->dev);
0217
0218     pm_runtime_set_suspended(&attrb->pdev->dev);
0219
0220     cancel_work_sync(&attrb->work);
0221     iio_trigger_unregister(attrb->trigger);
0222     iio_trigger_free(attrb->trigger);
0223     iio_triggered_buffer_cleanup(indio_dev);
0224 }
0225 EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);
0226
0227 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
0228     .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
0229 };
0230
0231 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
0232                 struct hid_sensor_common *attrb)
0233 {
0234     const struct attribute **fifo_attrs;
0235     int ret;
0236     struct iio_trigger *trig;
0237
0238     if (hid_sensor_batch_mode_supported(attrb))
0239         fifo_attrs = hid_sensor_fifo_attributes;
0240     else
0241         fifo_attrs = NULL;
0242
0243     ret = iio_triggered_buffer_setup_ext(indio_dev,
0244                          &iio_pollfunc_store_time, NULL,
0245                          IIO_BUFFER_DIRECTION_IN,
0246                          NULL, fifo_attrs);
0247     if (ret) {
0248         dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
0249         return ret;
0250     }
0251
0252     trig = iio_trigger_alloc(indio_dev->dev.parent,
0253                  "%s-dev%d", name, iio_device_id(indio_dev));
0254     if (trig == NULL) {
0255         dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
0256         ret = -ENOMEM;
0257         goto error_triggered_buffer_cleanup;
0258     }
0259
0260     iio_trigger_set_drvdata(trig, attrb);
0261     trig->ops = &hid_sensor_trigger_ops;
0262     ret = iio_trigger_register(trig);
0263
0264     if (ret) {
0265         dev_err(&indio_dev->dev, "Trigger Register Failed\n");
0266         goto error_free_trig;
0267     }
0268     attrb->trigger = trig;
0269     indio_dev->trig = iio_trigger_get(trig);
0270
0271     ret = pm_runtime_set_active(&indio_dev->dev);
0272     if (ret)
0273         goto error_unreg_trigger;
0274
0275     iio_device_set_drvdata(indio_dev, attrb);
0276
0277     INIT_WORK(&attrb->work, hid_sensor_set_power_work);
0278
0279     pm_suspend_ignore_children(&attrb->pdev->dev, true);
0280     /* Default to 3 seconds, but can be changed from sysfs */
0281     pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
0282                      3000);
0283     return ret;
0284 error_unreg_trigger:
0285     iio_trigger_unregister(trig);
0286 error_free_trig:
0287     iio_trigger_free(trig);
0288 error_triggered_buffer_cleanup:
0289     iio_triggered_buffer_cleanup(indio_dev);
0290     return ret;
0291 }
0292 EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);
0293
0294 static int __maybe_unused hid_sensor_suspend(struct device *dev)
0295 {
0296     struct iio_dev *indio_dev = dev_get_drvdata(dev);
0297     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0298
0299     return _hid_sensor_power_state(attrb, false);
0300 }
0301
0302 static int __maybe_unused hid_sensor_resume(struct device *dev)
0303 {
0304     struct iio_dev *indio_dev = dev_get_drvdata(dev);
0305     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0306     schedule_work(&attrb->work);
0307     return 0;
0308 }
0309
0310 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
0311 {
0312     struct iio_dev *indio_dev = dev_get_drvdata(dev);
0313     struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
0314     return _hid_sensor_power_state(attrb, true);
0315 }
0316
0317 const struct dev_pm_ops hid_sensor_pm_ops = {
0318     SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
0319     SET_RUNTIME_PM_OPS(hid_sensor_suspend,
0320                hid_sensor_runtime_resume, NULL)
0321 };
0322 EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);
0323
0324 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
0325 MODULE_DESCRIPTION("HID Sensor trigger processing");
0326 MODULE_LICENSE("GPL");
0327 MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);