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