From 0a8b22998fb069e25c4928eb70fbbbb794ae8fa8 Mon Sep 17 00:00:00 2001
From: Rajat Jain <rajatja@google.com>
Date: Fri, 7 Jan 2022 11:02:06 -0800
Subject: drm/privacy_screen: Add drvdata in drm_privacy_screen
Git-commit: 30598d925d466c53c4c218a58f80e043cfe9b085
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

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
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/drm_privacy_screen.c    |  5 ++++-
 include/drm/drm_privacy_screen_driver.h | 13 ++++++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_privacy_screen.c b/drivers/gpu/drm/drm_privacy_screen.c
index b688841c18e4..2b082e5e9732 100644
--- a/drivers/gpu/drm/drm_privacy_screen.c
+++ b/drivers/gpu/drm/drm_privacy_screen.c
@@ -387,7 +387,8 @@ static void drm_privacy_screen_device_release(struct device *dev)
  * * An ERR_PTR(errno) on failure.
  */
 struct drm_privacy_screen *drm_privacy_screen_register(
-	struct device *parent, const struct drm_privacy_screen_ops *ops)
+	struct device *parent, const struct drm_privacy_screen_ops *ops,
+	void *data)
 {
 	struct drm_privacy_screen *priv;
 	int ret;
@@ -404,6 +405,7 @@ struct drm_privacy_screen *drm_privacy_screen_register(
 	priv->dev.parent = parent;
 	priv->dev.release = drm_privacy_screen_device_release;
 	dev_set_name(&priv->dev, "privacy_screen-%s", dev_name(parent));
+	priv->drvdata = data;
 	priv->ops = ops;
 
 	priv->ops->get_hw_state(priv);
@@ -439,6 +441,7 @@ void drm_privacy_screen_unregister(struct drm_privacy_screen *priv)
 	mutex_unlock(&drm_privacy_screen_devs_lock);
 
 	mutex_lock(&priv->lock);
+	priv->drvdata = NULL;
 	priv->ops = NULL;
 	mutex_unlock(&priv->lock);
 
diff --git a/include/drm/drm_privacy_screen_driver.h b/include/drm/drm_privacy_screen_driver.h
index 24591b607675..4ef246d5706f 100644
--- a/include/drm/drm_privacy_screen_driver.h
+++ b/include/drm/drm_privacy_screen_driver.h
@@ -73,10 +73,21 @@ struct drm_privacy_screen {
 	 * 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);
+	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);
-- 
2.38.1