Re: [PATCH v2 5/6] mfd: arizona: Remove use of codec build config #ifdefs

[Lee Jones]

On Fri, 02 Oct 2015, Charles Keepax wrote:

> From: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> 
> Remove the use of #ifdefs around each case statement of the chip ID
> and type validation switches.
> 
> We must ensure that the contained code still compiles to nothing if
> support for that codec was not built into the kernel, to prevent
> creation of link references to missing functions. So the ifdefs are
> replaced with a use of the IS_ENABLED() macro.
> 
> Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> ---
> 
> Changes since v1:
>  - Changed IS_ENABLED if statements such that they wrap all code
>    that we want eliminated, to ensure that it does indeed get
>    eliminated.
> 
> Thanks,
> Charles
> 
>  drivers/mfd/arizona-core.c |  129 ++++++++++++++++++++++++--------------------
>  drivers/mfd/arizona-i2c.c  |   28 +++++-----
>  drivers/mfd/arizona-spi.c  |   18 ++++---
>  3 files changed, 97 insertions(+), 78 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index 39899bf..4e49210 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -1128,82 +1128,95 @@ int arizona_dev_init(struct arizona *arizona)
>  	arizona->rev &= ARIZONA_DEVICE_REVISION_MASK;
>  
>  	switch (reg) {
> -#ifdef CONFIG_MFD_WM5102
>  	case 0x5102:
> -		type_name = "WM5102";
> -		if (arizona->type != WM5102) {
> -			dev_warn(arizona->dev, "WM5102 registered as %d\n",
> -				 arizona->type);
> -			arizona->type = WM5102;
> +		if (IS_ENABLED(CONFIG_MFD_WM5102)) {
> +			type_name = "WM5102";
> +			if (arizona->type != WM5102) {
> +				dev_warn(arizona->dev,
> +					 "WM5102 registered as %d\n",
> +					 arizona->type);
> +				arizona->type = WM5102;
> +			}
> +
> +			apply_patch = wm5102_patch;
> +			arizona->rev &= 0x7;
> +			subdevs = wm5102_devs;
> +			n_subdevs = ARRAY_SIZE(wm5102_devs);
>  		}
> -		apply_patch = wm5102_patch;
> -		arizona->rev &= 0x7;
> -		subdevs = wm5102_devs;
> -		n_subdevs = ARRAY_SIZE(wm5102_devs);
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM5110
>  	case 0x5110:
> -		switch (arizona->type) {
> -		case WM5110:
> -			type_name = "WM5110";
> -			break;
> -		case WM8280:
> -			type_name = "WM8280";
> -			break;
> -		default:
> -			type_name = "WM5110";
> -			dev_warn(arizona->dev, "WM5110 registered as %d\n",
> -				 arizona->type);
> -			arizona->type = WM5110;
> -			break;
> +		if (IS_ENABLED(CONFIG_MFD_WM5110)) {
> +			switch (arizona->type) {
> +			case WM5110:
> +				type_name = "WM5110";
> +				break;
> +			case WM8280:
> +				type_name = "WM8280";
> +				break;
> +			default:
> +				type_name = "WM5110";
> +				dev_warn(arizona->dev,
> +					 "WM5110 registered as %d\n",
> +					 arizona->type);
> +				arizona->type = WM5110;
> +				break;
> +			}
> +
> +			apply_patch = wm5110_patch;
> +			subdevs = wm5110_devs;
> +			n_subdevs = ARRAY_SIZE(wm5110_devs);
>  		}
> -		apply_patch = wm5110_patch;
> -		subdevs = wm5110_devs;
> -		n_subdevs = ARRAY_SIZE(wm5110_devs);
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM8997
>  	case 0x8997:
> -		type_name = "WM8997";
> -		if (arizona->type != WM8997) {
> -			dev_warn(arizona->dev, "WM8997 registered as %d\n",
> -				 arizona->type);
> -			arizona->type = WM8997;
> +		if (IS_ENABLED(CONFIG_MFD_WM8997)) {
> +			type_name = "WM8997";
> +			if (arizona->type != WM8997) {
> +				dev_warn(arizona->dev,
> +					 "WM8997 registered as %d\n",
> +					 arizona->type);
> +				arizona->type = WM8997;
> +			}
> +
> +			apply_patch = wm8997_patch;
> +			subdevs = wm8997_devs;
> +			n_subdevs = ARRAY_SIZE(wm8997_devs);
>  		}
> -		apply_patch = wm8997_patch;
> -		subdevs = wm8997_devs;
> -		n_subdevs = ARRAY_SIZE(wm8997_devs);
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM8998
>  	case 0x6349:
> -		switch (arizona->type) {
> -		case WM8998:
> -			type_name = "WM8998";
> -			break;
> -
> -		case WM1814:
> -			type_name = "WM1814";
> -			break;
> +		if (IS_ENABLED(CONFIG_MFD_WM8998)) {
> +			switch (arizona->type) {
> +			case WM8998:
> +				type_name = "WM8998";
> +				break;
> +
> +			case WM1814:
> +				type_name = "WM1814";
> +				break;
> +
> +			default:
> +				type_name = "WM8998";
> +				dev_warn(arizona->dev,
> +					 "WM8998 registered as %d\n",
> +					 arizona->type);
> +				arizona->type = WM8998;
> +			}
>  
> -		default:
> -			type_name = "WM8998";
> -			dev_warn(arizona->dev, "WM8998 registered as %d\n",
> -				 arizona->type);
> -			arizona->type = WM8998;
> +			apply_patch = wm8998_patch;
> +			subdevs = wm8998_devs;
> +			n_subdevs = ARRAY_SIZE(wm8998_devs);
>  		}
> -
> -		apply_patch = wm8998_patch;
> -		subdevs = wm8998_devs;
> -		n_subdevs = ARRAY_SIZE(wm8998_devs);
>  		break;
> -#endif
>  	default:
>  		dev_err(arizona->dev, "Unknown device ID %x\n", reg);
>  		goto err_reset;
>  	}
>  
> +	if (!subdevs) {
> +		dev_err(arizona->dev,
> +			"No kernel support for device ID %x\n", reg);
> +		goto err_reset;
> +	}
> +
>  	dev_info(dev, "%s revision %c\n", type_name, arizona->rev + 'A');
>  
>  	if (apply_patch) {
> diff --git a/drivers/mfd/arizona-i2c.c b/drivers/mfd/arizona-i2c.c
> index cea1b40..914bdce 100644
> --- a/drivers/mfd/arizona-i2c.c
> +++ b/drivers/mfd/arizona-i2c.c
> @@ -27,7 +27,7 @@ static int arizona_i2c_probe(struct i2c_client *i2c,
>  			     const struct i2c_device_id *id)
>  {
>  	struct arizona *arizona;
> -	const struct regmap_config *regmap_config;
> +	const struct regmap_config *regmap_config = NULL;
>  	unsigned long type;
>  	int ret;
>  
> @@ -37,34 +37,36 @@ static int arizona_i2c_probe(struct i2c_client *i2c,
>  		type = id->driver_data;
>  
>  	switch (type) {
> -#ifdef CONFIG_MFD_WM5102
>  	case WM5102:
> -		regmap_config = &wm5102_i2c_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM5102))
> +			regmap_config = &wm5102_i2c_regmap;
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM5110
>  	case WM5110:
>  	case WM8280:
> -		regmap_config = &wm5110_i2c_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM5110))
> +			regmap_config = &wm5110_i2c_regmap;
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM8997
>  	case WM8997:
> -		regmap_config = &wm8997_i2c_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM8997))
> +			regmap_config = &wm8997_i2c_regmap;
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM8998
>  	case WM8998:
>  	case WM1814:
> -		regmap_config = &wm8998_i2c_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM8998))
> +			regmap_config = &wm8998_i2c_regmap;
>  		break;
> -#endif
>  	default:
>  		dev_err(&i2c->dev, "Unknown device type %ld\n",
>  			id->driver_data);
>  		return -EINVAL;
>  	}
>  
> +	if (!regmap_config) {
> +		dev_err(&i2c->dev,
> +			"No kernel support for device type %ld\n", type);
> +		return -EINVAL;
> +	}
> +
>  	arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
>  	if (arizona == NULL)
>  		return -ENOMEM;
> diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
> index 1e845f6..850a63a 100644
> --- a/drivers/mfd/arizona-spi.c
> +++ b/drivers/mfd/arizona-spi.c
> @@ -27,7 +27,7 @@ static int arizona_spi_probe(struct spi_device *spi)
>  {
>  	const struct spi_device_id *id = spi_get_device_id(spi);
>  	struct arizona *arizona;
> -	const struct regmap_config *regmap_config;
> +	const struct regmap_config *regmap_config = NULL;
>  	unsigned long type;
>  	int ret;
>  
> @@ -37,23 +37,27 @@ static int arizona_spi_probe(struct spi_device *spi)
>  		type = id->driver_data;
>  
>  	switch (type) {
> -#ifdef CONFIG_MFD_WM5102
>  	case WM5102:
> -		regmap_config = &wm5102_spi_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM5102))
> +			regmap_config = &wm5102_spi_regmap;
>  		break;
> -#endif
> -#ifdef CONFIG_MFD_WM5110
>  	case WM5110:
>  	case WM8280:
> -		regmap_config = &wm5110_spi_regmap;
> +		if (IS_ENABLED(CONFIG_MFD_WM5110))
> +			regmap_config = &wm5110_spi_regmap;
>  		break;
> -#endif
>  	default:
>  		dev_err(&spi->dev, "Unknown device type %ld\n",
>  			id->driver_data);
>  		return -EINVAL;
>  	}
>  
> +	if (!regmap_config) {
> +		dev_err(&spi->dev,
> +			"No kernel support for device type %ld\n", type);
> +		return -EINVAL;
> +	}
> +
>  	arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
>  	if (arizona == NULL)
>  		return -ENOMEM;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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