linux/include/drm/drm_privacy_screen_consumer.h
Hans de Goede 8a12b17055 drm/privacy-screen: Add notifier support (v2)
Add support for privacy-screen consumers to register a notifier to
be notified of external (e.g. done by the hw itself on a hotkey press)
state changes.

Changes in v2:
- Drop WARN_ON(mutex_is_locked(&priv->lock)) check in
  drm_privacy_screen_call_notifier_chain() it may be locked by
  another thread, which would lead to a false-positive triggering
  of the check

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211005202322.700909-5-hdegoede@redhat.com
2021-10-14 13:12:25 +02:00

66 lines
1.9 KiB
C

/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2020 Red Hat, Inc.
*
* Authors:
* Hans de Goede <hdegoede@redhat.com>
*/
#ifndef __DRM_PRIVACY_SCREEN_CONSUMER_H__
#define __DRM_PRIVACY_SCREEN_CONSUMER_H__
#include <linux/device.h>
#include <drm/drm_connector.h>
struct drm_privacy_screen;
#if IS_ENABLED(CONFIG_DRM_PRIVACY_SCREEN)
struct drm_privacy_screen *drm_privacy_screen_get(struct device *dev,
const char *con_id);
void drm_privacy_screen_put(struct drm_privacy_screen *priv);
int drm_privacy_screen_set_sw_state(struct drm_privacy_screen *priv,
enum drm_privacy_screen_status sw_state);
void drm_privacy_screen_get_state(struct drm_privacy_screen *priv,
enum drm_privacy_screen_status *sw_state_ret,
enum drm_privacy_screen_status *hw_state_ret);
int drm_privacy_screen_register_notifier(struct drm_privacy_screen *priv,
struct notifier_block *nb);
int drm_privacy_screen_unregister_notifier(struct drm_privacy_screen *priv,
struct notifier_block *nb);
#else
static inline struct drm_privacy_screen *drm_privacy_screen_get(struct device *dev,
const char *con_id)
{
return ERR_PTR(-ENODEV);
}
static inline void drm_privacy_screen_put(struct drm_privacy_screen *priv)
{
}
static inline int drm_privacy_screen_set_sw_state(struct drm_privacy_screen *priv,
enum drm_privacy_screen_status sw_state)
{
return -ENODEV;
}
static inline void drm_privacy_screen_get_state(struct drm_privacy_screen *priv,
enum drm_privacy_screen_status *sw_state_ret,
enum drm_privacy_screen_status *hw_state_ret)
{
*sw_state_ret = PRIVACY_SCREEN_DISABLED;
*hw_state_ret = PRIVACY_SCREEN_DISABLED;
}
static inline int drm_privacy_screen_register_notifier(struct drm_privacy_screen *priv,
struct notifier_block *nb)
{
return -ENODEV;
}
static inline int drm_privacy_screen_unregister_notifier(struct drm_privacy_screen *priv,
struct notifier_block *nb)
{
return -ENODEV;
}
#endif
#endif