linux-kernel - [RFC 2/5] drivers/base: Allow driver-data to be attached to a master

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Date:	Tue, 22 Apr 2014 17:09:30 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	dri-devel@...ts.freedesktop.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [RFC 2/5] drivers/base: Allow driver-data to be attached to a master

From: Thierry Reding <treding@...dia.com>

Similarly to what can be done for device drivers, allow driver-specific
data to be attached to a master. This is necessary for masters whose
device is already bound to by a different driver and therefore cannot be
used to store the driver-specific data.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/base/component.c  | 13 +++++++++++++
 include/linux/component.h |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index 14fe81bf5ed2..e3693c6d552f 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -25,6 +25,8 @@ struct master {
 
 	const struct component_master_ops *ops;
 	struct device *dev;
+
+	void *drvdata;
 };
 
 struct component {
@@ -53,6 +55,17 @@ static struct master *__master_find(struct device *dev,
 	return NULL;
 }
 
+void master_set_drvdata(struct master *master, void *data)
+{
+	if (master)
+		master->drvdata = data;
+}
+
+void *master_get_drvdata(struct master *master)
+{
+	return master ? master->drvdata : NULL;
+}
+
 /* Attach an unattached component to a master. */
 static void component_attach_master(struct master *master, struct component *c)
 {
diff --git a/include/linux/component.h b/include/linux/component.h
index 89fe8bb35053..9c2ec9fe48d6 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -25,6 +25,9 @@ int component_master_add(struct device *, const struct component_master_ops *);
 void component_master_del(struct device *,
 	const struct component_master_ops *);
 
+void master_set_drvdata(struct master *, void *);
+void *master_get_drvdata(struct master *);
+
 int component_master_add_child(struct master *master,
 	int (*compare)(struct device *, void *), void *compare_data);
 
-- 
1.9.2

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