linux-kernel - [PATCH] extcon: Implement OF-based extcon lookup properly

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Date:	Thu, 16 Oct 2014 15:11:44 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Subject: [PATCH] extcon: Implement OF-based extcon lookup properly

From: Tomasz Figa <tomasz.figa@...il.com>

Platform bus is not the only way to have extcon devices, so current
implementation of of_extcon_get_extcon_dev() is broken. Also using
parent device node only to get device name is quite ugly.

This patch reimplements of_extcon_get_extcon_dev() to do exactly the
same as extcon_get_extcon_dev() but instead of comparing names, compare
node pointers.

Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
[mszyprow: simplified the code]
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/extcon/extcon-class.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 4c2f2c543bb7..043dcd9946c9 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -29,6 +29,7 @@
 #include <linux/fs.h>
 #include <linux/err.h>
 #include <linux/extcon.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/of.h>
@@ -997,13 +998,16 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
 		return ERR_PTR(-ENODEV);
 	}
 
-	edev = extcon_get_extcon_dev(node->name);
-	if (!edev) {
-		dev_err(dev, "unable to get extcon device : %s\n", node->name);
-		return ERR_PTR(-ENODEV);
+	mutex_lock(&extcon_dev_list_lock);
+	list_for_each_entry(edev, &extcon_dev_list, entry) {
+		if (edev->dev.parent && edev->dev.parent->of_node == node) {
+			mutex_unlock(&extcon_dev_list_lock);
+			return edev;
+		}
 	}
+	mutex_unlock(&extcon_dev_list_lock);
 
-	return edev;
+	return ERR_PTR(-EPROBE_DEFER);
 }
 #else
 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
-- 
1.9.2

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