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/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2020 Red Hat, Inc.
*
* Authors:
* Hans de Goede <hdegoede@redhat.com>
*/
#ifndef __DRM_PRIVACY_SCREEN_DRIVER_H__
#define __DRM_PRIVACY_SCREEN_DRIVER_H__
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <drm/drm_connector.h>
struct drm_privacy_screen;
/**
* struct drm_privacy_screen_ops - drm_privacy_screen operations
*
* Defines the operations which the privacy-screen class code may call.
* These functions should be implemented by the privacy-screen driver.
*/
struct drm_privacy_screen_ops {
/**
* @set_sw_state: Called to request a change of the privacy-screen
* state. The privacy-screen class code contains a check to avoid this
* getting called when the hw_state reports the state is locked.
* It is the driver's responsibility to update sw_state and hw_state.
* This is always called with the drm_privacy_screen's lock held.
*/
int (*set_sw_state)(struct drm_privacy_screen *priv,
enum drm_privacy_screen_status sw_state);
/**
* @get_hw_state: Called to request that the driver gets the current
* privacy-screen state from the hardware and then updates sw_state and
* hw_state accordingly. This will be called by the core just before
* the privacy-screen is registered in sysfs.
*/
void (*get_hw_state)(struct drm_privacy_screen *priv);
};
/**
* struct drm_privacy_screen - central privacy-screen structure
*
* Central privacy-screen structure, this contains the struct device used
* to register the screen in sysfs, the screen's state, ops, etc.
*/
struct drm_privacy_screen {
/** @dev: device used to register the privacy-screen in sysfs. */
struct device dev;
/** @lock: mutex protection all fields in this struct. */
struct mutex lock;
/** @list: privacy-screen devices list list-entry. */
struct list_head list;
/** @notifier_head: privacy-screen notifier head. */
struct blocking_notifier_head notifier_head;
/**
* @ops: &struct drm_privacy_screen_ops for this privacy-screen.
* This is NULL if the driver has unregistered the privacy-screen.
*/
const struct drm_privacy_screen_ops *ops;
/**
* @sw_state: The privacy-screen's software state, see
* :ref:`Standard Connector Properties<standard_connector_properties>`
* for more info.
*/
enum drm_privacy_screen_status sw_state;
/**
* @hw_state: The privacy-screen's hardware state, see
* :ref:`Standard Connector Properties<standard_connector_properties>`
* for more info.
*/
enum drm_privacy_screen_status hw_state;
/**
* @drvdata: Private data owned by the privacy screen provider
*/
void *drvdata;
};
static inline
void *drm_privacy_screen_get_drvdata(struct drm_privacy_screen *priv)
{
return priv->drvdata;
}
struct drm_privacy_screen *drm_privacy_screen_register(
struct device *parent, const struct drm_privacy_screen_ops *ops,
void *data);
void drm_privacy_screen_unregister(struct drm_privacy_screen *priv);
void drm_privacy_screen_call_notifier_chain(struct drm_privacy_screen *priv);
#endif
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