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Date: Tue, 13 Oct 2015 10:23:22 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc: patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
rf@...nsource.wolfsonmicro.com, sameo@...ux.intel.com
Subject: Re: [PATCH v2 5/6] mfd: arizona: Remove use of codec build config
#ifdefs
On Fri, 02 Oct 2015, Charles Keepax wrote:
> From: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
>
> 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@...nsource.wolfsonmicro.com>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>
> 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(-)
Acked-by: Lee Jones <lee.jones@...aro.org>
> 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 │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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