[PATCH] i2c: imx: convert to use managed functions

[Shawn Guo]

On Sat, May 12, 2012 at 09:02:23PM +0800, Richard Zhao wrote:
> Signed-off-by: Richard Zhao <richard.zhao at freescale.com>
> ---
>  drivers/i2c/busses/i2c-imx.c |   59 ++++++++++--------------------------------
>  1 file changed, 14 insertions(+), 45 deletions(-)
> 
Nice cleanup.

> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 56bce9a..927da64 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -118,7 +118,6 @@ static u16 __initdata i2c_clk_div[50][2] = {
>  
>  struct imx_i2c_struct {
>  	struct i2c_adapter	adapter;
> -	struct resource		*res;
>  	struct clk		*clk;
>  	void __iomem		*base;
>  	int			irq;

Is it being used elsewhere except i2c_imx_probe()?  If not, we can
remove it from the struct?

> @@ -473,7 +472,6 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
>  	struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
>  	struct pinctrl *pinctrl;
>  	void __iomem *base;
> -	resource_size_t res_size;
>  	int irq, bitrate;
>  	int ret;
>  
> @@ -490,25 +488,16 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
>  		return -ENOENT;
>  	}
>  
> -	res_size = resource_size(res);
> -
> -	if (!request_mem_region(res->start, res_size, DRIVER_NAME)) {
> -		dev_err(&pdev->dev, "request_mem_region failed\n");
> +	base = devm_request_and_ioremap(&pdev->dev, res);
> +	if (!base)
>  		return -EBUSY;

Since we are moving to devm_request_and_ioremap, I'd recommend change
the error code to what the function kerneldoc suggests, -EADDRNOTAVAIL.

> -	}
> -
> -	base = ioremap(res->start, res_size);
> -	if (!base) {
> -		dev_err(&pdev->dev, "ioremap failed\n");
> -		ret = -EIO;
> -		goto fail1;
> -	}
>  
> -	i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
> +	i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct),
> +				GFP_KERNEL);
>  	if (!i2c_imx) {
>  		dev_err(&pdev->dev, "can't allocate interface\n");
>  		ret = -ENOMEM;
> -		goto fail2;
> +		return ret;
>  	}
>  
>  	/* Setup i2c_imx driver structure */
> @@ -520,27 +509,27 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
>  	i2c_imx->adapter.dev.of_node	= pdev->dev.of_node;
>  	i2c_imx->irq			= irq;
>  	i2c_imx->base			= base;
> -	i2c_imx->res			= res;
>  
>  	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
>  	if (IS_ERR(pinctrl)) {
>  		ret = PTR_ERR(pinctrl);
> -		goto fail3;
> +		return ret;
>  	}
>  
>  	/* Get I2C clock */
> -	i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
> +	i2c_imx->clk = devm_clk_get(&pdev->dev, "i2c_clk");
>  	if (IS_ERR(i2c_imx->clk)) {
>  		ret = PTR_ERR(i2c_imx->clk);
>  		dev_err(&pdev->dev, "can't get I2C clock\n");
> -		goto fail3;
> +		return ret;
>  	}

Ok, you are basing the patch on two APIs,
devm_pinctrl_get_select_default and devm_clk_get, that have not hit
mainline, so it looks like a candidate for the next merge window.

Regards,
Shawn

>  
>  	/* Request IRQ */
> -	ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
> +	ret = devm_request_irq(&pdev->dev, i2c_imx->irq, i2c_imx_isr, 0,
> +				pdev->name, i2c_imx);
>  	if (ret) {
>  		dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
> -		goto fail4;
> +		return ret;
>  	}
>  
>  	/* Init queue */
> @@ -565,7 +554,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
>  	ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "registration failed\n");
> -		goto fail5;
> +		return ret;
>  	}
>  
>  	of_i2c_register_devices(&i2c_imx->adapter);
> @@ -575,26 +564,14 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
>  
>  	dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
>  	dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
> -		i2c_imx->res->start, i2c_imx->res->end);
> +		res->start, res->end);
>  	dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
> -		res_size, i2c_imx->res->start);
> +		resource_size(res), res->start);
>  	dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
>  		i2c_imx->adapter.name);
>  	dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
>  
>  	return 0;   /* Return OK */
> -
> -fail5:
> -	free_irq(i2c_imx->irq, i2c_imx);
> -fail4:
> -	clk_put(i2c_imx->clk);
> -fail3:
> -	kfree(i2c_imx);
> -fail2:
> -	iounmap(base);
> -fail1:
> -	release_mem_region(res->start, resource_size(res));
> -	return ret; /* Return error number */
>  }
>  
>  static int __exit i2c_imx_remove(struct platform_device *pdev)
> @@ -606,20 +583,12 @@ static int __exit i2c_imx_remove(struct platform_device *pdev)
>  	i2c_del_adapter(&i2c_imx->adapter);
>  	platform_set_drvdata(pdev, NULL);
>  
> -	/* free interrupt */
> -	free_irq(i2c_imx->irq, i2c_imx);
> -
>  	/* setup chip registers to defaults */
>  	writeb(0, i2c_imx->base + IMX_I2C_IADR);
>  	writeb(0, i2c_imx->base + IMX_I2C_IFDR);
>  	writeb(0, i2c_imx->base + IMX_I2C_I2CR);
>  	writeb(0, i2c_imx->base + IMX_I2C_I2SR);
>  
> -	clk_put(i2c_imx->clk);
> -
> -	iounmap(i2c_imx->base);
> -	release_mem_region(i2c_imx->res->start, resource_size(i2c_imx->res));
> -	kfree(i2c_imx);
>  	return 0;
>  }
>  
> -- 
> 1.7.9.5
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>