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

[Charles Keepax]

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(-)

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;
-- 
1.7.2.5

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