ASoC: wm8731: Factor out the I2C and SPI bus code into separate modules

Placing both the I2C and SPI code in the same module causes problems with
mixes of modular and non-modular builds of the buses so it's generally bad
practice. As with other drivers split the bus code out of the WM8731 driver
into separate modules.

Signed-off-by: Mark Brown <[e-mail]>
Acked-by: Charles Keepax <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/atmel/Kconfig

···
 config SND_AT91_SOC_SAM9G20_WM8731
 	tristate "SoC Audio support for WM8731-based At91sam9g20 evaluation board"
 	depends on ARCH_AT91 || COMPILE_TEST
-	depends on ATMEL_SSC && SND_SOC_I2C_AND_SPI
+	depends on ATMEL_SSC && I2C
 	select SND_ATMEL_SOC_SSC_PDC
-	select SND_SOC_WM8731
+	select SND_SOC_WM8731_I2C
 	help
 	  Say Y if you want to add support for SoC audio on WM8731-based
 	  AT91sam9g20 evaluation board.

sound/soc/au1x/Kconfig

···
 	select SND_SOC_AC97_CODEC
 	select SND_SOC_WM9712
 	select SND_SOC_AU1XPSC_I2S
-	select SND_SOC_WM8731
+	select SND_SOC_WM8731_I2C
 	help
 	  Select this option to enable audio (AC97 and I2S) on the
 	  Alchemy/AMD/RMI/NetLogic Db1200, Db1550 and Db1300 evaluation boards.

sound/soc/codecs/Kconfig

···
 	imply SND_SOC_WM8711
 	imply SND_SOC_WM8727
 	imply SND_SOC_WM8728
-	imply SND_SOC_WM8731
+	imply SND_SOC_WM8731_I2C
+	imply SND_SOC_WM8731_SPI
 	imply SND_SOC_WM8737
 	imply SND_SOC_WM8741
 	imply SND_SOC_WM8750
···
 	depends on SND_SOC_I2C_AND_SPI
 
 config SND_SOC_WM8731
-	tristate "Wolfson Microelectronics WM8731 CODEC"
-	depends on SND_SOC_I2C_AND_SPI
+	tristate
+
+config SND_SOC_WM8731_I2C
+	tristate "Wolfson Microelectronics WM8731 CODEC with I2C"
+	depends on I2C
+	select REGMAP
+	select SND_SOC_WM8731
+
+config SND_SOC_WM8731_SPI
+	tristate "Wolfson Microelectronics WM8731 CODEC with SPI"
+	depends on SPI
+	select REGMAP
+	select SND_SOC_WM8731
 
 config SND_SOC_WM8737
 	tristate "Wolfson Microelectronics WM8737 ADC"

sound/soc/codecs/Makefile

···
 snd-soc-wm8727-objs := wm8727.o
 snd-soc-wm8728-objs := wm8728.o
 snd-soc-wm8731-objs := wm8731.o
+snd-soc-wm8731-i2c-objs := wm8731-i2c.o
+snd-soc-wm8731-spi-objs := wm8731-spi.o
 snd-soc-wm8737-objs := wm8737.o
 snd-soc-wm8741-objs := wm8741.o
 snd-soc-wm8750-objs := wm8750.o
···
 obj-$(CONFIG_SND_SOC_WM8727)	+= snd-soc-wm8727.o
 obj-$(CONFIG_SND_SOC_WM8728)	+= snd-soc-wm8728.o
 obj-$(CONFIG_SND_SOC_WM8731)	+= snd-soc-wm8731.o
+obj-$(CONFIG_SND_SOC_WM8731_I2C)	+= snd-soc-wm8731-i2c.o
+obj-$(CONFIG_SND_SOC_WM8731_SPI)	+= snd-soc-wm8731-spi.o
 obj-$(CONFIG_SND_SOC_WM8737)	+= snd-soc-wm8737.o
 obj-$(CONFIG_SND_SOC_WM8741)	+= snd-soc-wm8741.o
 obj-$(CONFIG_SND_SOC_WM8750)	+= snd-soc-wm8750.o

sound/soc/codecs/wm8731-i2c.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * wm8731-i2c.c  --  WM8731 ALSA SoC Audio driver I2C code
+ *
+ * Copyright 2005 Openedhand Ltd.
+ * Copyright 2006-12 Wolfson Microelectronics, plc
+ *
+ * Author: Richard Purdie <[e-mail]>
+ *
+ * Based on wm8753.c by Liam Girdwood
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include "wm8731.h"
+
+
+static const struct of_device_id wm8731_of_match[] = {
+	{ .compatible = "wlf,wm8731", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, wm8731_of_match);
+
+static int wm8731_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct wm8731_priv *wm8731;
+	int ret;
+
+	wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv),
+			      GFP_KERNEL);
+	if (wm8731 == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, wm8731);
+
+	wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);
+	if (IS_ERR(wm8731->regmap)) {
+		ret = PTR_ERR(wm8731->regmap);
+		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	return wm8731_init(&i2c->dev, wm8731);
+}
+
+static const struct i2c_device_id wm8731_i2c_id[] = {
+	{ "wm8731", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
+
+static struct i2c_driver wm8731_i2c_driver = {
+	.driver = {
+		.name = "wm8731",
+		.of_match_table = wm8731_of_match,
+	},
+	.probe =    wm8731_i2c_probe,
+	.id_table = wm8731_i2c_id,
+};
+
+module_i2c_driver(wm8731_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC WM8731 driver - I2C");
+MODULE_AUTHOR("Richard Purdie");
+MODULE_LICENSE("GPL");

sound/soc/codecs/wm8731-spi.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * wm8731.c  --  WM8731 ALSA SoC Audio driver
+ *
+ * Copyright 2005 Openedhand Ltd.
+ * Copyright 2006-12 Wolfson Microelectronics, plc
+ *
+ * Author: Richard Purdie <[e-mail]>
+ *
+ * Based on wm8753.c by Liam Girdwood
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include "wm8731.h"
+
+static const struct of_device_id wm8731_of_match[] = {
+	{ .compatible = "wlf,wm8731", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, wm8731_of_match);
+
+static int wm8731_spi_probe(struct spi_device *spi)
+{
+	struct wm8731_priv *wm8731;
+	int ret;
+
+	wm8731 = devm_kzalloc(&spi->dev, sizeof(*wm8731), GFP_KERNEL);
+	if (wm8731 == NULL)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, wm8731);
+
+	wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
+	if (IS_ERR(wm8731->regmap)) {
+		ret = PTR_ERR(wm8731->regmap);
+		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	return wm8731_init(&spi->dev, wm8731);
+}
+
+static struct spi_driver wm8731_spi_driver = {
+	.driver = {
+		.name	= "wm8731",
+		.of_match_table = wm8731_of_match,
+	},
+	.probe		= wm8731_spi_probe,
+};
+
+module_spi_driver(wm8731_spi_driver);
+
+MODULE_DESCRIPTION("ASoC WM8731 driver - SPI");
+MODULE_AUTHOR("Richard Purdie");
+MODULE_LICENSE("GPL");

sound/soc/codecs/wm8731.c

···
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
-#include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
-#include <linux/spi/spi.h>
-#include <linux/of_device.h>
-#include <linux/mutex.h>
 #include <linux/clk.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
···
 
 #include "wm8731.h"
 
-#define WM8731_NUM_SUPPLIES 4
 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
 	"AVDD",
 	"HPVDD",
 	"DCVDD",
 	"DBVDD",
 };
-
-/* codec private data */
-struct wm8731_priv {
-	struct regmap *regmap;
-	struct clk *mclk;
-	struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
-	const struct snd_pcm_hw_constraint_list *constraints;
-	unsigned int sysclk;
-	int sysclk_type;
-	int playback_fs;
-	bool deemph;
-
-	struct mutex lock;
-};
-
 
 /*
  * wm8731 register cache
···
 	.non_legacy_dai_naming	= 1,
 };
 
-static int wm8731_init(struct device *dev, struct wm8731_priv *wm8731)
+int wm8731_init(struct device *dev, struct wm8731_priv *wm8731)
 {
 	int ret = 0, i;
 
···
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(wm8731_init);
 
-static const struct of_device_id wm8731_of_match[] = {
-	{ .compatible = "wlf,wm8731", },
-	{ }
-};
-
-MODULE_DEVICE_TABLE(of, wm8731_of_match);
-
-static const struct regmap_config wm8731_regmap = {
+const struct regmap_config wm8731_regmap = {
 	.reg_bits = 7,
 	.val_bits = 9,
 
···
 	.reg_defaults = wm8731_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults),
 };
-
-#if defined(CONFIG_SPI_MASTER)
-static int wm8731_spi_probe(struct spi_device *spi)
-{
-	struct wm8731_priv *wm8731;
-	int ret;
-
-	wm8731 = devm_kzalloc(&spi->dev, sizeof(*wm8731), GFP_KERNEL);
-	if (wm8731 == NULL)
-		return -ENOMEM;
-
-	spi_set_drvdata(spi, wm8731);
-
-	wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
-	if (IS_ERR(wm8731->regmap)) {
-		ret = PTR_ERR(wm8731->regmap);
-		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
-			ret);
-		return ret;
-	}
-
-	return wm8731_init(&spi->dev, wm8731);
-}
-
-static struct spi_driver wm8731_spi_driver = {
-	.driver = {
-		.name	= "wm8731",
-		.of_match_table = wm8731_of_match,
-	},
-	.probe		= wm8731_spi_probe,
-};
-#endif /* CONFIG_SPI_MASTER */
-
-#if IS_ENABLED(CONFIG_I2C)
-static int wm8731_i2c_probe(struct i2c_client *i2c,
-			    const struct i2c_device_id *id)
-{
-	struct wm8731_priv *wm8731;
-	int ret;
-
-	wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv),
-			      GFP_KERNEL);
-	if (wm8731 == NULL)
-		return -ENOMEM;
-
-	i2c_set_clientdata(i2c, wm8731);
-
-	wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);
-	if (IS_ERR(wm8731->regmap)) {
-		ret = PTR_ERR(wm8731->regmap);
-		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
-			ret);
-		return ret;
-	}
-
-	return wm8731_init(&i2c->dev, wm8731);
-}
-
-static const struct i2c_device_id wm8731_i2c_id[] = {
-	{ "wm8731", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
-
-static struct i2c_driver wm8731_i2c_driver = {
-	.driver = {
-		.name = "wm8731",
-		.of_match_table = wm8731_of_match,
-	},
-	.probe =    wm8731_i2c_probe,
-	.id_table = wm8731_i2c_id,
-};
-#endif
-
-static int __init wm8731_modinit(void)
-{
-	int ret = 0;
-#if IS_ENABLED(CONFIG_I2C)
-	ret = i2c_add_driver(&wm8731_i2c_driver);
-	if (ret != 0) {
-		printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
-		       ret);
-	}
-#endif
-#if defined(CONFIG_SPI_MASTER)
-	ret = spi_register_driver(&wm8731_spi_driver);
-	if (ret != 0) {
-		printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
-		       ret);
-	}
-#endif
-	return ret;
-}
-module_init(wm8731_modinit);
-
-static void __exit wm8731_exit(void)
-{
-#if IS_ENABLED(CONFIG_I2C)
-	i2c_del_driver(&wm8731_i2c_driver);
-#endif
-#if defined(CONFIG_SPI_MASTER)
-	spi_unregister_driver(&wm8731_spi_driver);
-#endif
-}
-module_exit(wm8731_exit);
+EXPORT_SYMBOL_GPL(wm8731_regmap);
 
 MODULE_DESCRIPTION("ASoC WM8731 driver");
 MODULE_AUTHOR("Richard Purdie");

sound/soc/codecs/wm8731.h

···
 #ifndef _WM8731_H
 #define _WM8731_H
 
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+struct clk;
+struct snd_pcm_hw_constraint_list;
+
 /* WM8731 register space */
 
 #define WM8731_LINVOL   0x00
···
 #define WM8731_SYSCLK_XTAL 1
 
 #define WM8731_DAI		0
+
+#define WM8731_NUM_SUPPLIES 4
+
+/* codec private data */
+struct wm8731_priv {
+	struct regmap *regmap;
+	struct clk *mclk;
+	struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
+	const struct snd_pcm_hw_constraint_list *constraints;
+	unsigned int sysclk;
+	int sysclk_type;
+	int playback_fs;
+	bool deemph;
+
+	struct mutex lock;
+};
+
+extern const struct regmap_config wm8731_regmap;
+
+int wm8731_init(struct device *dev, struct wm8731_priv *wm8731);
 
 #endif

sound/soc/pxa/Kconfig

···
 	tristate "SoC Audio support for Sharp Zaurus SL-C7x0"
 	depends on SND_PXA2XX_SOC && PXA_SHARP_C7xx && I2C
 	select SND_PXA2XX_SOC_I2S
-	select SND_SOC_WM8731
+	select SND_SOC_WM8731_I2C
 	help
 	  Say Y if you want to add support for SoC audio on Sharp
 	  Zaurus SL-C7x0 models (Corgi, Shepherd, Husky).
···
 	tristate "SoC Audio support for Poodle"
 	depends on SND_PXA2XX_SOC && MACH_POODLE && I2C
 	select SND_PXA2XX_SOC_I2S
-	select SND_SOC_WM8731
+	select SND_SOC_WM8731_I2C
 	help
 	  Say Y if you want to add support for SoC audio on Sharp
 	  Zaurus SL-5600 model (Poodle).