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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * HID Sensors Driver4 * Copyright (c) 2012, Intel Corporation.5 */6#include <linux/device.h>7#include <linux/platform_device.h>8#include <linux/module.h>9#include <linux/delay.h>10#include <linux/hid-sensor-hub.h>11#include <linux/workqueue.h>12#include <linux/iio/iio.h>13#include <linux/iio/trigger.h>14#include <linux/iio/triggered_buffer.h>15#include <linux/iio/trigger_consumer.h>16#include <linux/iio/sysfs.h>17#include "hid-sensor-trigger.h"18 19static ssize_t _hid_sensor_set_report_latency(struct device *dev,20 struct device_attribute *attr,21 const char *buf, size_t len)22{23 struct iio_dev *indio_dev = dev_to_iio_dev(dev);24 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);25 int integer, fract, ret;26 int latency;27 28 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);29 if (ret)30 return ret;31 32 latency = integer * 1000 + fract / 1000;33 ret = hid_sensor_set_report_latency(attrb, latency);34 if (ret < 0)35 return ret;36 37 attrb->latency_ms = hid_sensor_get_report_latency(attrb);38 39 return len;40}41 42static ssize_t _hid_sensor_get_report_latency(struct device *dev,43 struct device_attribute *attr,44 char *buf)45{46 struct iio_dev *indio_dev = dev_to_iio_dev(dev);47 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);48 int latency;49 50 latency = hid_sensor_get_report_latency(attrb);51 if (latency < 0)52 return latency;53 54 return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);55}56 57static ssize_t _hid_sensor_get_fifo_state(struct device *dev,58 struct device_attribute *attr,59 char *buf)60{61 struct iio_dev *indio_dev = dev_to_iio_dev(dev);62 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);63 int latency;64 65 latency = hid_sensor_get_report_latency(attrb);66 if (latency < 0)67 return latency;68 69 return sprintf(buf, "%d\n", !!latency);70}71 72static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,73 _hid_sensor_get_report_latency,74 _hid_sensor_set_report_latency, 0);75static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,76 _hid_sensor_get_fifo_state, NULL, 0);77 78static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {79 &iio_dev_attr_hwfifo_timeout,80 &iio_dev_attr_hwfifo_enabled,81 NULL,82};83 84static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)85{86 int state_val;87 int report_val;88 s32 poll_value = 0;89 90 if (state) {91 if (sensor_hub_device_open(st->hsdev))92 return -EIO;93 94 atomic_inc(&st->data_ready);95 96 state_val = hid_sensor_get_usage_index(st->hsdev,97 st->power_state.report_id,98 st->power_state.index,99 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);100 report_val = hid_sensor_get_usage_index(st->hsdev,101 st->report_state.report_id,102 st->report_state.index,103 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);104 105 poll_value = hid_sensor_read_poll_value(st);106 } else {107 int val;108 109 val = atomic_dec_if_positive(&st->data_ready);110 if (val < 0)111 return 0;112 113 sensor_hub_device_close(st->hsdev);114 state_val = hid_sensor_get_usage_index(st->hsdev,115 st->power_state.report_id,116 st->power_state.index,117 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);118 report_val = hid_sensor_get_usage_index(st->hsdev,119 st->report_state.report_id,120 st->report_state.index,121 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);122 }123 124 if (state_val >= 0) {125 state_val += st->power_state.logical_minimum;126 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,127 st->power_state.index, sizeof(state_val),128 &state_val);129 }130 131 if (report_val >= 0) {132 report_val += st->report_state.logical_minimum;133 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,134 st->report_state.index,135 sizeof(report_val),136 &report_val);137 }138 139 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",140 st->pdev->name, state_val, report_val);141 142 sensor_hub_get_feature(st->hsdev, st->power_state.report_id,143 st->power_state.index,144 sizeof(state_val), &state_val);145 if (state && poll_value)146 msleep_interruptible(poll_value * 2);147 148 return 0;149}150EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);151 152int hid_sensor_power_state(struct hid_sensor_common *st, bool state)153{154 155#ifdef CONFIG_PM156 int ret;157 158 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))159 pm_runtime_enable(&st->pdev->dev);160 161 if (state) {162 atomic_inc(&st->user_requested_state);163 ret = pm_runtime_resume_and_get(&st->pdev->dev);164 } else {165 atomic_dec(&st->user_requested_state);166 pm_runtime_mark_last_busy(&st->pdev->dev);167 pm_runtime_use_autosuspend(&st->pdev->dev);168 ret = pm_runtime_put_autosuspend(&st->pdev->dev);169 }170 if (ret < 0)171 return ret;172 173 return 0;174#else175 atomic_set(&st->user_requested_state, state);176 return _hid_sensor_power_state(st, state);177#endif178}179 180static void hid_sensor_set_power_work(struct work_struct *work)181{182 struct hid_sensor_common *attrb = container_of(work,183 struct hid_sensor_common,184 work);185 186 if (attrb->poll_interval >= 0)187 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,188 attrb->poll.index,189 sizeof(attrb->poll_interval),190 &attrb->poll_interval);191 192 if (attrb->raw_hystersis >= 0)193 sensor_hub_set_feature(attrb->hsdev,194 attrb->sensitivity.report_id,195 attrb->sensitivity.index,196 sizeof(attrb->raw_hystersis),197 &attrb->raw_hystersis);198 199 if (attrb->latency_ms > 0)200 hid_sensor_set_report_latency(attrb, attrb->latency_ms);201 202 if (atomic_read(&attrb->user_requested_state))203 _hid_sensor_power_state(attrb, true);204}205 206static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,207 bool state)208{209 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);210}211 212void hid_sensor_remove_trigger(struct iio_dev *indio_dev,213 struct hid_sensor_common *attrb)214{215 if (atomic_read(&attrb->runtime_pm_enable))216 pm_runtime_disable(&attrb->pdev->dev);217 218 pm_runtime_set_suspended(&attrb->pdev->dev);219 220 cancel_work_sync(&attrb->work);221 iio_trigger_unregister(attrb->trigger);222 iio_trigger_free(attrb->trigger);223 iio_triggered_buffer_cleanup(indio_dev);224}225EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);226 227static const struct iio_trigger_ops hid_sensor_trigger_ops = {228 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,229};230 231int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,232 struct hid_sensor_common *attrb)233{234 const struct iio_dev_attr **fifo_attrs;235 int ret;236 struct iio_trigger *trig;237 238 if (hid_sensor_batch_mode_supported(attrb))239 fifo_attrs = hid_sensor_fifo_attributes;240 else241 fifo_attrs = NULL;242 243 ret = iio_triggered_buffer_setup_ext(indio_dev,244 &iio_pollfunc_store_time, NULL,245 IIO_BUFFER_DIRECTION_IN,246 NULL, fifo_attrs);247 if (ret) {248 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");249 return ret;250 }251 252 trig = iio_trigger_alloc(indio_dev->dev.parent,253 "%s-dev%d", name, iio_device_id(indio_dev));254 if (trig == NULL) {255 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");256 ret = -ENOMEM;257 goto error_triggered_buffer_cleanup;258 }259 260 iio_trigger_set_drvdata(trig, attrb);261 trig->ops = &hid_sensor_trigger_ops;262 ret = iio_trigger_register(trig);263 264 if (ret) {265 dev_err(&indio_dev->dev, "Trigger Register Failed\n");266 goto error_free_trig;267 }268 attrb->trigger = trig;269 indio_dev->trig = iio_trigger_get(trig);270 271 ret = pm_runtime_set_active(&indio_dev->dev);272 if (ret)273 goto error_unreg_trigger;274 275 iio_device_set_drvdata(indio_dev, attrb);276 277 INIT_WORK(&attrb->work, hid_sensor_set_power_work);278 279 pm_suspend_ignore_children(&attrb->pdev->dev, true);280 /* Default to 3 seconds, but can be changed from sysfs */281 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,282 3000);283 return ret;284error_unreg_trigger:285 iio_trigger_unregister(trig);286error_free_trig:287 iio_trigger_free(trig);288error_triggered_buffer_cleanup:289 iio_triggered_buffer_cleanup(indio_dev);290 return ret;291}292EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);293 294static int __maybe_unused hid_sensor_suspend(struct device *dev)295{296 struct iio_dev *indio_dev = dev_get_drvdata(dev);297 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);298 299 return _hid_sensor_power_state(attrb, false);300}301 302static int __maybe_unused hid_sensor_resume(struct device *dev)303{304 struct iio_dev *indio_dev = dev_get_drvdata(dev);305 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);306 schedule_work(&attrb->work);307 return 0;308}309 310static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)311{312 struct iio_dev *indio_dev = dev_get_drvdata(dev);313 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);314 return _hid_sensor_power_state(attrb, true);315}316 317const struct dev_pm_ops hid_sensor_pm_ops = {318 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)319 SET_RUNTIME_PM_OPS(hid_sensor_suspend,320 hid_sensor_runtime_resume, NULL)321};322EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);323 324MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");325MODULE_DESCRIPTION("HID Sensor trigger processing");326MODULE_LICENSE("GPL");327MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);328