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30598d925d
Allow a privacy screen provider to stash its private data pointer in the drm_privacy_screen, and update the drm_privacy_screen_register() call to accept that. Also introduce a *_get_drvdata() so that it can retrieved back when needed. This also touches the IBM Thinkpad platform driver, the only user of privacy screen today, to pass NULL for now to the updated API. Signed-off-by: Rajat Jain <rajatja@google.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220107190208.95479-1-rajatja@google.com
95 lines
3 KiB
C
95 lines
3 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_DRIVER_H__
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#define __DRM_PRIVACY_SCREEN_DRIVER_H__
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <drm/drm_connector.h>
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struct drm_privacy_screen;
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/**
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* struct drm_privacy_screen_ops - drm_privacy_screen operations
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*
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* Defines the operations which the privacy-screen class code may call.
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* These functions should be implemented by the privacy-screen driver.
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*/
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struct drm_privacy_screen_ops {
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/**
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* @set_sw_state: Called to request a change of the privacy-screen
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* state. The privacy-screen class code contains a check to avoid this
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* getting called when the hw_state reports the state is locked.
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* It is the driver's responsibility to update sw_state and hw_state.
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* This is always called with the drm_privacy_screen's lock held.
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*/
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int (*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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* @get_hw_state: Called to request that the driver gets the current
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* privacy-screen state from the hardware and then updates sw_state and
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* hw_state accordingly. This will be called by the core just before
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* the privacy-screen is registered in sysfs.
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*/
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void (*get_hw_state)(struct drm_privacy_screen *priv);
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};
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/**
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* struct drm_privacy_screen - central privacy-screen structure
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*
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* Central privacy-screen structure, this contains the struct device used
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* to register the screen in sysfs, the screen's state, ops, etc.
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*/
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struct drm_privacy_screen {
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/** @dev: device used to register the privacy-screen in sysfs. */
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struct device dev;
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/** @lock: mutex protection all fields in this struct. */
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struct mutex lock;
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/** @list: privacy-screen devices list list-entry. */
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struct list_head list;
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/** @notifier_head: privacy-screen notifier head. */
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struct blocking_notifier_head notifier_head;
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/**
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* @ops: &struct drm_privacy_screen_ops for this privacy-screen.
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* This is NULL if the driver has unregistered the privacy-screen.
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*/
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const struct drm_privacy_screen_ops *ops;
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/**
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* @sw_state: The privacy-screen's software state, see
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* :ref:`Standard Connector Properties<standard_connector_properties>`
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* for more info.
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*/
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enum drm_privacy_screen_status sw_state;
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/**
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* @hw_state: The privacy-screen's hardware state, see
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* :ref:`Standard Connector Properties<standard_connector_properties>`
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* for more info.
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*/
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enum drm_privacy_screen_status hw_state;
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/**
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* @drvdata: Private data owned by the privacy screen provider
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*/
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void *drvdata;
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};
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static inline
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void *drm_privacy_screen_get_drvdata(struct drm_privacy_screen *priv)
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{
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return priv->drvdata;
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}
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struct drm_privacy_screen *drm_privacy_screen_register(
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struct device *parent, const struct drm_privacy_screen_ops *ops,
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void *data);
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void drm_privacy_screen_unregister(struct drm_privacy_screen *priv);
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void drm_privacy_screen_call_notifier_chain(struct drm_privacy_screen *priv);
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#endif
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