linux-kernel - [PATCH] Input: ambakmi - Use managed interfaces

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Date:	Sun, 13 Jul 2014 23:00:51 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	Russell King <linux@....linux.org.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] Input: ambakmi - Use managed interfaces

This patch introduces the use of managed interfaces like devm_clk_get,
devm_kalloc etc. devm_ioremap_resource is used instead of
amba_request_regions and devm_ioremap. It also does away with the functions
to free the allocated memory in probe and remove functions. Also, some
labels in the probe function are removed.

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/input/serio/ambakmi.c | 44 ++++++++++---------------------------------
 1 file changed, 10 insertions(+), 34 deletions(-)

diff --git a/drivers/input/serio/ambakmi.c b/drivers/input/serio/ambakmi.c
index 8b748d9..405a175 100644
--- a/drivers/input/serio/ambakmi.c
+++ b/drivers/input/serio/ambakmi.c
@@ -23,6 +23,7 @@
 #include <linux/clk.h>
 
 #include <asm/io.h>
+#include <linux/io.h>
 #include <asm/irq.h>
 
 #define KMI_BASE	(kmi->base)
@@ -112,19 +113,10 @@ static int amba_kmi_probe(struct amba_device *dev,
 {
 	struct amba_kmi_port *kmi;
 	struct serio *io;
-	int ret;
-
-	ret = amba_request_regions(dev, NULL);
-	if (ret)
-		return ret;
-
-	kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
-	io = kzalloc(sizeof(struct serio), GFP_KERNEL);
-	if (!kmi || !io) {
-		ret = -ENOMEM;
-		goto out;
-	}
 
+	io = devm_kzalloc(&dev->dev, sizeof(struct serio), GFP_KERNEL);
+	if (!io)
+		return -ENOMEM;
 
 	io->id.type	= SERIO_8042;
 	io->write	= amba_kmi_write;
@@ -135,32 +127,20 @@ static int amba_kmi_probe(struct amba_device *dev,
 	io->port_data	= kmi;
 	io->dev.parent	= &dev->dev;
 
+	kmi->base	= devm_ioremap_resource(&dev->dev, &dev->res);
+	if (IS_ERR(kmi->base))
+		return PTR_ERR(kmi->base);
 	kmi->io		= io;
-	kmi->base	= ioremap(dev->res.start, resource_size(&dev->res));
-	if (!kmi->base) {
-		ret = -ENOMEM;
-		goto out;
-	}
 
-	kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
-	if (IS_ERR(kmi->clk)) {
-		ret = PTR_ERR(kmi->clk);
-		goto unmap;
-	}
+	kmi->clk = devm_clk_get(&dev->dev, "KMIREFCLK");
+	if (IS_ERR(kmi->clk))
+		return PTR_ERR(kmi->clk);
 
 	kmi->irq = dev->irq[0];
 	amba_set_drvdata(dev, kmi);
 
 	serio_register_port(kmi->io);
 	return 0;
-
- unmap:
-	iounmap(kmi->base);
- out:
-	kfree(kmi);
-	kfree(io);
-	amba_release_regions(dev);
-	return ret;
 }
 
 static int amba_kmi_remove(struct amba_device *dev)
@@ -168,10 +148,6 @@ static int amba_kmi_remove(struct amba_device *dev)
 	struct amba_kmi_port *kmi = amba_get_drvdata(dev);
 
 	serio_unregister_port(kmi->io);
-	clk_put(kmi->clk);
-	iounmap(kmi->base);
-	kfree(kmi);
-	amba_release_regions(dev);
 	return 0;
 }
 
-- 
1.9.1

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