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8a12b17055
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
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* Authors:
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* Hans de Goede <hdegoede@redhat.com>
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*/
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#ifndef __DRM_PRIVACY_SCREEN_CONSUMER_H__
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#define __DRM_PRIVACY_SCREEN_CONSUMER_H__
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#include <linux/device.h>
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#include <drm/drm_connector.h>
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struct drm_privacy_screen;
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#if IS_ENABLED(CONFIG_DRM_PRIVACY_SCREEN)
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struct drm_privacy_screen *drm_privacy_screen_get(struct device *dev,
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const char *con_id);
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void drm_privacy_screen_put(struct drm_privacy_screen *priv);
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int drm_privacy_screen_set_sw_state(struct drm_privacy_screen *priv,
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enum drm_privacy_screen_status sw_state);
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void drm_privacy_screen_get_state(struct drm_privacy_screen *priv,
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enum drm_privacy_screen_status *sw_state_ret,
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enum drm_privacy_screen_status *hw_state_ret);
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int drm_privacy_screen_register_notifier(struct drm_privacy_screen *priv,
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struct notifier_block *nb);
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int drm_privacy_screen_unregister_notifier(struct drm_privacy_screen *priv,
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struct notifier_block *nb);
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#else
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static inline struct drm_privacy_screen *drm_privacy_screen_get(struct device *dev,
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const char *con_id)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void drm_privacy_screen_put(struct drm_privacy_screen *priv)
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{
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}
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static inline int drm_privacy_screen_set_sw_state(struct drm_privacy_screen *priv,
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enum drm_privacy_screen_status sw_state)
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{
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return -ENODEV;
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}
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static inline void drm_privacy_screen_get_state(struct drm_privacy_screen *priv,
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enum drm_privacy_screen_status *sw_state_ret,
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enum drm_privacy_screen_status *hw_state_ret)
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{
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*sw_state_ret = PRIVACY_SCREEN_DISABLED;
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*hw_state_ret = PRIVACY_SCREEN_DISABLED;
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}
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static inline int drm_privacy_screen_register_notifier(struct drm_privacy_screen *priv,
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struct notifier_block *nb)
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{
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return -ENODEV;
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}
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static inline int drm_privacy_screen_unregister_notifier(struct drm_privacy_screen *priv,
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struct notifier_block *nb)
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{
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return -ENODEV;
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}
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#endif
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#endif
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