linux-kernel - [PATCH v4 3/3] i2c: xilinx: Use devm

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Message-Id: <398db8439f51ed4fcfbcb074b61d0e23408617a3.1384776761.git.michal.simek@xilinx.com>
Date:	Mon, 18 Nov 2013 13:13:09 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	linux-kernel@...r.kernel.org, monstr@...str.eu, wsa@...-dreams.de,
	joe@...ches.com
Cc:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Peter Korsgaard <jacmet@...site.dk>,
	Kedareswara rao Appana <appanad@...inx.com>,
	linux-i2c@...r.kernel.org
Subject: [PATCH v4 3/3] i2c: xilinx: Use devm_* functions

From: Kedareswara rao Appana <appana.durga.rao@...inx.com>

Simplified the probe and remove functions using devm_* functions

Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
Changes in v4:
- Remove dev_get_platdata casting

Changes in v3:
- Remove error message which is already shown by devm_ioremap_resource
- Fix dev_get_platform recasting to simple (void *)
- Path 2/3 was removed because it was created on broken hw design
  and it was replaced by the patch which fixed irq handler registration
  and irq enabling. This patch reflect this new change in 2/3

Changes in v2: None

 drivers/i2c/busses/i2c-xiic.c | 67 +++++++++++--------------------------------
 1 file changed, 16 insertions(+), 51 deletions(-)

diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index 1ded456b..451d534 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
@@ -696,32 +697,20 @@ static int xiic_i2c_probe(struct platform_device *pdev)
 	int ret, irq;
 	u8 i;

+	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+	if (!i2c)
+		return -ENOMEM;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		goto resource_missing;
+	i2c->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(i2c->base))
+		return PTR_ERR(i2c->base);

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
-		goto resource_missing;
-
-	pdata = (struct xiic_i2c_platform_data *)dev_get_platdata(&pdev->dev);
-
-	i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
-	if (!i2c)
-		return -ENOMEM;
+		return irq;

-	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
-		dev_err(&pdev->dev, "Memory region busy\n");
-		ret = -EBUSY;
-		goto request_mem_failed;
-	}
-
-	i2c->base = ioremap(res->start, resource_size(res));
-	if (!i2c->base) {
-		dev_err(&pdev->dev, "Unable to map registers\n");
-		ret = -EIO;
-		goto map_failed;
-	}
+	pdata = dev_get_platdata(&pdev->dev);

 	/* hook up driver to tree */
 	platform_set_drvdata(pdev, i2c);
@@ -732,10 +721,11 @@ static int xiic_i2c_probe(struct platform_device *pdev)

 	spin_lock_init(&i2c->lock);
 	init_waitqueue_head(&i2c->wait);
-	ret = request_irq(irq, xiic_isr, 0, pdev->name, i2c);
-	if (ret) {
+
+	ret = devm_request_irq(&pdev->dev, irq, xiic_isr, 0, pdev->name, i2c);
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Cannot claim IRQ\n");
-		goto request_irq_failed;
+		return ret;
 	}

 	xiic_reinit(i2c);
@@ -744,7 +734,8 @@ static int xiic_i2c_probe(struct platform_device *pdev)
 	ret = i2c_add_adapter(&i2c->adap);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add adapter\n");
-		goto add_adapter_failed;
+		xiic_deinit(i2c);
+		return ret;
 	}

 	if (pdata) {
@@ -754,43 +745,17 @@ static int xiic_i2c_probe(struct platform_device *pdev)
 	}

 	return 0;
-
-add_adapter_failed:
-	free_irq(irq, i2c);
-request_irq_failed:
-	xiic_deinit(i2c);
-	iounmap(i2c->base);
-map_failed:
-	release_mem_region(res->start, resource_size(res));
-request_mem_failed:
-	kfree(i2c);
-
-	return ret;
-resource_missing:
-	dev_err(&pdev->dev, "IRQ or Memory resource is missing\n");
-	return -ENOENT;
 }

 static int xiic_i2c_remove(struct platform_device *pdev)
 {
 	struct xiic_i2c *i2c = platform_get_drvdata(pdev);
-	struct resource *res;

 	/* remove adapter & data */
 	i2c_del_adapter(&i2c->adap);

 	xiic_deinit(i2c);

-	free_irq(platform_get_irq(pdev, 0), i2c);
-
-	iounmap(i2c->base);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res)
-		release_mem_region(res->start, resource_size(res));
-
-	kfree(i2c);
-
 	return 0;
 }

--
1.8.2.3


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