[PATCH 1/8] i2c: at91: use managed resources

[Voss, Nikolaus]

ludovic.desroches at atmel.com wrote on Friday, August 31, 2012 11:21 AM:
> From: Ludovic Desroches <ludovic.desroches at atmel.com>
> 
> Use managed resources to ease the cleanup.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches at atmel.com>
Acked-by: Nikolaus Voss <n.voss at weinmann.de>

> ---
>  drivers/i2c/busses/i2c-at91.c | 85 +++++++++++++------------------------------
>  1 file changed, 25 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 2b8b2c2..08aaee7 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -326,61 +326,49 @@ static struct i2c_algorithm at91_twi_algorithm = {
>  static int __devinit at91_twi_probe(struct platform_device *pdev)
>  {
>  	struct at91_twi_dev *dev;
> -	struct resource *mem, *ioarea;
> -	int irq, rc;
> +	struct resource *mem;
> +	int rc;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +	init_completion(&dev->cmd_complete);
> +	dev->dev = &pdev->dev;
> 
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!mem)
>  		return -ENODEV;
> 
> -	irq = platform_get_irq(pdev, 0);
> -	if (irq < 0)
> -		return irq;
> -
> -	ioarea = request_mem_region(mem->start, resource_size(mem),
> pdev->name);
> -	if (!ioarea)
> +	dev->base = devm_request_and_ioremap(&pdev->dev, mem);
> +	if (!dev->base)
>  		return -EBUSY;
> 
> -	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> -	if (!dev) {
> -		rc = -ENOMEM;
> -		goto err_release_region;
> +	dev->irq = platform_get_irq(pdev, 0);
> +	if (dev->irq < 0)
> +		return dev->irq;
> +
> +	rc = devm_request_irq(&pdev->dev, dev->irq, atmel_twi_interrupt,
> 0,
> +			 dev_name(dev->dev), dev);
> +	if (rc) {
> +		dev_err(dev->dev, "Cannot get irq %d: %d\n", dev->irq, rc);
> +		return rc;
>  	}
> 
>  	if (pdev->id_entry)
>  		dev->ip_id = pdev->id_entry->driver_data;
> 
> -	init_completion(&dev->cmd_complete);
> -
> -	dev->dev = &pdev->dev;
> -	dev->irq = irq;
>  	platform_set_drvdata(pdev, dev);
> 
> -	dev->clk = clk_get(dev->dev, NULL);
> +	dev->clk = devm_clk_get(dev->dev, NULL);
>  	if (IS_ERR(dev->clk)) {
>  		dev_err(dev->dev, "no clock defined\n");
> -		rc = -ENODEV;
> -		goto err_free_mem;
> -	}
> -	clk_prepare(dev->clk);
> -	clk_enable(dev->clk);
> -
> -	dev->base = ioremap(mem->start, resource_size(mem));
> -	if (!dev->base) {
> -		rc = -EBUSY;
> -		goto err_mem_ioremap;
> +		return -ENODEV;
>  	}
> +	clk_prepare_enable(dev->clk);
> 
>  	at91_calc_twi_clock(dev, TWI_CLK_HZ);
>  	at91_init_twi_bus(dev);
> 
> -	rc = request_irq(dev->irq, atmel_twi_interrupt, 0,
> -			 dev_name(dev->dev), dev);
> -	if (rc) {
> -		dev_err(dev->dev, "Cannot get irq %d: %d\n", dev->irq, rc);
> -		goto err_unuse_clocks;
> -	}
> -
>  	snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");
>  	i2c_set_adapdata(&dev->adapter, dev);
>  	dev->adapter.owner = THIS_MODULE;
> @@ -394,44 +382,21 @@ static int __devinit at91_twi_probe(struct
> platform_device *pdev)
>  	if (rc) {
>  		dev_err(dev->dev, "Adapter %s registration failed\n",
>  			dev->adapter.name);
> -		goto err_free_irq;
> +		clk_disable_unprepare(dev->clk);
> +		return rc;
>  	}
> 
>  	dev_info(dev->dev, "AT91 i2c bus driver.\n");
>  	return 0;
> -
> -err_free_irq:
> -	free_irq(dev->irq, dev);
> -err_unuse_clocks:
> -	iounmap(dev->base);
> -err_mem_ioremap:
> -	clk_disable(dev->clk);
> -	clk_unprepare(dev->clk);
> -	clk_put(dev->clk);
> -err_free_mem:
> -	kfree(dev);
> -err_release_region:
> -	release_mem_region(mem->start, resource_size(mem));
> -
> -	return rc;
>  }
> 
>  static int __devexit at91_twi_remove(struct platform_device *pdev)
>  {
>  	struct at91_twi_dev *dev = platform_get_drvdata(pdev);
> -	struct resource *mem;
>  	int rc;
> 
>  	rc = i2c_del_adapter(&dev->adapter);
> -	clk_disable(dev->clk);
> -	clk_unprepare(dev->clk);
> -	clk_put(dev->clk);
> -	free_irq(dev->irq, dev);
> -	iounmap(dev->base);
> -	kfree(dev);
> -
> -	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	release_mem_region(mem->start, resource_size(mem));
> +	clk_disable_unprepare(dev->clk);
> 
>  	return rc;
>  }
> --
> 1.7.11.3