// SPDX-License-Identifier: GPL-2.0-only
/*
* HID Sensors Driver
* Copyright (c) 2012, Intel Corporation.
*/
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/workqueue.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/sysfs.h>
#include "hid-sensor-trigger.h"
static ssize_t _hid_sensor_set_report_latency(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
int integer, fract, ret;
int latency;
ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
if (ret)
return ret;
latency = integer * 1000 + fract / 1000;
ret = hid_sensor_set_report_latency(attrb, latency);
if (ret < 0)
return len;
attrb->latency_ms = hid_sensor_get_report_latency(attrb);
return len;
}
static ssize_t _hid_sensor_get_report_latency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
int latency;
latency = hid_sensor_get_report_latency(attrb);
if (latency < 0)
return latency;
return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
}
static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
int latency;
latency = hid_sensor_get_report_latency(attrb);
if (latency < 0)
return latency;
return sprintf(buf, "%d\n", !!latency);
}
static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
_hid_sensor_get_report_latency,
_hid_sensor_set_report_latency, 0);
static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
_hid_sensor_get_fifo_state, NULL, 0);
static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {
&iio_dev_attr_hwfifo_timeout,
&iio_dev_attr_hwfifo_enabled,
NULL,
};
static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
{
int state_val;
int report_val;
s32 poll_value = 0;
if (state) {
if (sensor_hub_device_open(st->hsdev))
return -EIO;
atomic_inc(&st->data_ready);
state_val = hid_sensor_get_usage_index(st->hsdev,
st->power_state.report_id,
st->power_state.index,
HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
report_val = hid_sensor_get_usage_index(st->hsdev,
st->report_state.report_id,
st->report_state.index,
HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
poll_value = hid_sensor_read_poll_value(st);
} else {
int val;
val = atomic_dec_if_positive(&st->data_ready);
if (val < 0)
return 0;
sensor_hub_device_close(st->hsdev);
state_val = hid_sensor_get_usage_index(st->hsdev,
st->power_state.report_id,
st->power_state.index,
HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
report_val = hid_sensor_get_usage_index(st->hsdev,
st->report_state.report_id,
st->report_state.index,
HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
}
if (state_val >= 0) {
state_val += st->power_state.logical_minimum;
sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
st->power_state.index, sizeof(state_val),
&state_val);
}
if (report_val >= 0) {
report_val += st->report_state.logical_minimum;
sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
st->report_state.index,
sizeof(report_val),
&report_val);
}
pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
st->pdev->name, state_val, report_val);
sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
st->power_state.index,
sizeof(state_val), &state_val);
if (state && poll_value)
msleep_interruptible(poll_value * 2);
return 0;
}
EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);
int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
{
#ifdef CONFIG_PM
int ret;
if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
pm_runtime_enable(&st->pdev->dev);
if (state) {
atomic_inc(&st->user_requested_state);
ret = pm_runtime_resume_and_get(&st->pdev->dev);
} else {
atomic_dec(&st->user_requested_state);
pm_runtime_mark_last_busy(&st->pdev->dev);
pm_runtime_use_autosuspend(&st->pdev->dev);
ret = pm_runtime_put_autosuspend(&st->pdev->dev);
}
if (ret < 0)
return ret;
return 0;
#else
atomic_set(&st->user_requested_state, state);
return _hid_sensor_power_state(st, state);
#endif
}
static void hid_sensor_set_power_work(struct work_struct *work)
{
struct hid_sensor_common *attrb = container_of(work,
struct hid_sensor_common,
work);
if (attrb->poll_interval >= 0)
sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
attrb->poll.index,
sizeof(attrb->poll_interval),
&attrb->poll_interval);
if (attrb->raw_hystersis >= 0)
sensor_hub_set_feature(attrb->hsdev,
attrb->sensitivity.report_id,
attrb->sensitivity.index,
sizeof(attrb->raw_hystersis),
&attrb->raw_hystersis);
if (attrb->latency_ms > 0)
hid_sensor_set_report_latency(attrb, attrb->latency_ms);
if (atomic_read(&attrb->user_requested_state))
_hid_sensor_power_state(attrb, true);
}
static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
}
void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
struct hid_sensor_common *attrb)
{
if (atomic_read(&attrb->runtime_pm_enable))
pm_runtime_disable(&attrb->pdev->dev);
pm_runtime_set_suspended(&attrb->pdev->dev);
cancel_work_sync(&attrb->work);
iio_trigger_unregister(attrb->trigger);
iio_trigger_free(attrb->trigger);
iio_triggered_buffer_cleanup(indio_dev);
}
EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);
static const struct iio_trigger_ops hid_sensor_trigger_ops = {
.set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
};
int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
struct hid_sensor_common *attrb)
{
const struct iio_dev_attr **fifo_attrs;
int ret;
struct iio_trigger *trig;
if (hid_sensor_batch_mode_supported(attrb))
fifo_attrs = hid_sensor_fifo_attributes;
else
fifo_attrs = NULL;
ret = iio_triggered_buffer_setup_ext(indio_dev,
&iio_pollfunc_store_time, NULL,
IIO_BUFFER_DIRECTION_IN,
NULL, fifo_attrs);
if (ret) {
dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
return ret;
}
trig = iio_trigger_alloc(indio_dev->dev.parent,
"%s-dev%d", name, iio_device_id(indio_dev));
if (trig == NULL) {
dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
ret = -ENOMEM;
goto error_triggered_buffer_cleanup;
}
iio_trigger_set_drvdata(trig, attrb);
trig->ops = &hid_sensor_trigger_ops;
ret = iio_trigger_register(trig);
if (ret) {
dev_err(&indio_dev->dev, "Trigger Register Failed\n");
goto error_free_trig;
}
attrb->trigger = trig;
indio_dev->trig = iio_trigger_get(trig);
ret = pm_runtime_set_active(&indio_dev->dev);
if (ret)
goto error_unreg_trigger;
iio_device_set_drvdata(indio_dev, attrb);
INIT_WORK(&attrb->work, hid_sensor_set_power_work);
pm_suspend_ignore_children(&attrb->pdev->dev, true);
/* Default to 3 seconds, but can be changed from sysfs */
pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
3000);
return ret;
error_unreg_trigger:
iio_trigger_unregister(trig);
error_free_trig:
iio_trigger_free(trig);
error_triggered_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
return ret;
}
EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);
static int __maybe_unused hid_sensor_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
return _hid_sensor_power_state(attrb, false);
}
static int __maybe_unused hid_sensor_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
schedule_work(&attrb->work);
return 0;
}
static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
return _hid_sensor_power_state(attrb, true);
}
const struct dev_pm_ops hid_sensor_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
SET_RUNTIME_PM_OPS(hid_sensor_suspend,
hid_sensor_runtime_resume, NULL)
};
EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);
MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
MODULE_DESCRIPTION("HID Sensor trigger processing");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);
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