i2c: pnx: Use devm_*() functions

Use devm_*() functions to make cleanup paths simpler,
and remove redundant return value check of platform_get_resource()
because the value is checked by devm_ioremap_resource().
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-pnx.c

@@ -628,11 +628,9 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 	struct resource *res;
 	u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000;
 
-	alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
-	if (!alg_data) {
-		ret = -ENOMEM;
-		goto err_kzalloc;
-	}
+	alg_data = devm_kzalloc(&pdev->dev, sizeof(*alg_data), GFP_KERNEL);
+	if (!alg_data)
+		return -ENOMEM;
 
 	platform_set_drvdata(pdev, alg_data);
 
@@ -657,11 +655,9 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 		 */
 	}
 #endif
-	alg_data->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(alg_data->clk)) {
-		ret = PTR_ERR(alg_data->clk);
-		goto out_drvdata;
-	}
+	alg_data->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(alg_data->clk))
+		return PTR_ERR(alg_data->clk);
 
 	init_timer(&alg_data->mif.timer);
 	alg_data->mif.timer.function = i2c_pnx_timeout;
@@ -672,31 +668,13 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 
 	/* Register I/O resource */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Unable to get mem resource.\n");
-		ret = -EBUSY;
-		goto out_clkget;
-	}
-	if (!request_mem_region(res->start, I2C_PNX_REGION_SIZE,
-				pdev->name)) {
-		dev_err(&pdev->dev,
-		       "I/O region 0x%08x for I2C already in use.\n",
-		       res->start);
-		ret = -ENOMEM;
-		goto out_clkget;
-	}
-
-	alg_data->base = res->start;
-	alg_data->ioaddr = ioremap(res->start, I2C_PNX_REGION_SIZE);
-	if (!alg_data->ioaddr) {
-		dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
-		ret = -ENOMEM;
-		goto out_release;
-	}
+	alg_data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(alg_data->ioaddr))
+		return PTR_ERR(alg_data->ioaddr);
 
 	ret = clk_enable(alg_data->clk);
 	if (ret)
-		goto out_unmap;
+		return ret;
 
 	freq = clk_get_rate(alg_data->clk);
 
@@ -730,8 +708,8 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 		ret = alg_data->irq;
 		goto out_clock;
 	}
-	ret = request_irq(alg_data->irq, i2c_pnx_interrupt,
-			0, pdev->name, alg_data);
+	ret = devm_request_irq(&pdev->dev, alg_data->irq, i2c_pnx_interrupt,
+			       0, pdev->name, alg_data);
 	if (ret)
 		goto out_clock;
 
@@ -739,7 +717,7 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 	ret = i2c_add_numbered_adapter(&alg_data->adapter);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "I2C: Failed to add bus\n");
-		goto out_irq;
+		goto out_clock;
 	}
 
 	dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
@@ -747,19 +725,8 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 
 	return 0;
 
-out_irq:
-	free_irq(alg_data->irq, alg_data);
 out_clock:
 	clk_disable(alg_data->clk);
-out_unmap:
-	iounmap(alg_data->ioaddr);
-out_release:
-	release_mem_region(res->start, I2C_PNX_REGION_SIZE);
-out_clkget:
-	clk_put(alg_data->clk);
-out_drvdata:
-	kfree(alg_data);
-err_kzalloc:
 	return ret;
 }
 
@@ -767,13 +734,8 @@ static int i2c_pnx_remove(struct platform_device *pdev)
 {
 	struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);
 
-	free_irq(alg_data->irq, alg_data);
 	i2c_del_adapter(&alg_data->adapter);
 	clk_disable(alg_data->clk);
-	iounmap(alg_data->ioaddr);
-	release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE);
-	clk_put(alg_data->clk);
-	kfree(alg_data);
 
 	return 0;
 }

include/linux/i2c-pnx.h

@@ -31,7 +31,6 @@ struct i2c_pnx_algo_data {
 	int			last;
 	struct clk		*clk;
 	struct i2c_adapter	adapter;
-	phys_addr_t		base;
 	int			irq;
 	u32			timeout;
 };