ASoC: ad193x: Split SPI and I2C code into different modules

There are a few known (minor) problems with having the support code for both I2C
and SPI in the same module:
    * We need to be extra careful to make sure to not build the driver into the
      kernel if one of the subsystems is build as a module (Currently only I2C
      can be build as a module).
    * The module init path error handling is rather ugly. E.g. what should be
      done if either the SPI or the I2C driver fails to register? Most drivers
      that implement SPI and I2C in the same module currently fallback to
      undefined behavior in that case. Splitting the the driver into two
      modules, one for each bus, allows the registration of the other bus driver
      to continue without problems if one of them fails.

This patch splits the AD193X driver into 3 modules. One core module that
implements the device logic, but is independent of the bus method used. And one
module for SPI and I2C each that registers the drivers and sets up the regmap
struct for the bus.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 15 insertions, 125 deletions

diff --git a/sound/soc/codecs/ad193x.c b/sound/soc/codecs/ad193x.c
index 5a42dca535b7..f644a34a28de 100644
--- a/sound/soc/codecs/ad193x.c
+++ b/sound/soc/codecs/ad193x.c
@@ -6,12 +6,10 @@
  * Licensed under the GPL-2 or later.
  */
 
-#include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
-#include <linux/i2c.h>
-#include <linux/spi/spi.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -19,6 +17,7 @@
 #include <sound/initval.h>
 #include <sound/soc.h>
 #include <sound/tlv.h>
+
 #include "ad193x.h"
 
 /* codec private data */
@@ -320,7 +319,7 @@ static struct snd_soc_dai_driver ad193x_dai = {
 	.ops = &ad193x_dai_ops,
 };
 
-static int ad193x_probe(struct snd_soc_codec *codec)
+static int ad193x_codec_probe(struct snd_soc_codec *codec)
 {
 	struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 	int ret;
@@ -352,7 +351,7 @@ static int ad193x_probe(struct snd_soc_codec *codec)
 }
 
 static struct snd_soc_codec_driver soc_codec_dev_ad193x = {
-	.probe = 	ad193x_probe,
+	.probe = ad193x_codec_probe,
 	.controls = ad193x_snd_controls,
 	.num_controls = ARRAY_SIZE(ad193x_snd_controls),
 	.dapm_widgets = ad193x_dapm_widgets,
@@ -366,140 +365,31 @@ static bool adau193x_reg_volatile(struct device *dev, unsigned int reg)
 	return false;
 }
 
-#if defined(CONFIG_SPI_MASTER)
-
-static const struct regmap_config ad193x_spi_regmap_config = {
-	.val_bits = 8,
-	.reg_bits = 16,
-	.read_flag_mask = 0x09,
-	.write_flag_mask = 0x08,
-
+const struct regmap_config ad193x_regmap_config = {
 	.max_register = AD193X_NUM_REGS - 1,
 	.volatile_reg = adau193x_reg_volatile,
 };
+EXPORT_SYMBOL_GPL(ad193x_regmap_config);
 
-static int ad193x_spi_probe(struct spi_device *spi)
+int ad193x_probe(struct device *dev, struct regmap *regmap)
 {
 	struct ad193x_priv *ad193x;
 
-	ad193x = devm_kzalloc(&spi->dev, sizeof(struct ad193x_priv),
-			      GFP_KERNEL);
-	if (ad193x == NULL)
-		return -ENOMEM;
-
-	ad193x->regmap = devm_regmap_init_spi(spi, &ad193x_spi_regmap_config);
-	if (IS_ERR(ad193x->regmap))
-		return PTR_ERR(ad193x->regmap);
-
-	spi_set_drvdata(spi, ad193x);
-
-	return snd_soc_register_codec(&spi->dev, &soc_codec_dev_ad193x,
-			&ad193x_dai, 1);
-}
-
-static int ad193x_spi_remove(struct spi_device *spi)
-{
-	snd_soc_unregister_codec(&spi->dev);
-	return 0;
-}
-
-static struct spi_driver ad193x_spi_driver = {
-	.driver = {
-		.name	= "ad193x",
-		.owner	= THIS_MODULE,
-	},
-	.probe		= ad193x_spi_probe,
-	.remove		= ad193x_spi_remove,
-};
-#endif
-
-#if IS_ENABLED(CONFIG_I2C)
-
-static const struct regmap_config ad193x_i2c_regmap_config = {
-	.val_bits = 8,
-	.reg_bits = 8,
-
-	.max_register = AD193X_NUM_REGS - 1,
-	.volatile_reg = adau193x_reg_volatile,
-};
-
-static const struct i2c_device_id ad193x_id[] = {
-	{ "ad1936", 0 },
-	{ "ad1937", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, ad193x_id);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
 
-static int ad193x_i2c_probe(struct i2c_client *client,
-			    const struct i2c_device_id *id)
-{
-	struct ad193x_priv *ad193x;
-
-	ad193x = devm_kzalloc(&client->dev, sizeof(struct ad193x_priv),
-			      GFP_KERNEL);
+	ad193x = devm_kzalloc(dev, sizeof(*ad193x), GFP_KERNEL);
 	if (ad193x == NULL)
 		return -ENOMEM;
 
-	ad193x->regmap = devm_regmap_init_i2c(client, &ad193x_i2c_regmap_config);
-	if (IS_ERR(ad193x->regmap))
-		return PTR_ERR(ad193x->regmap);
-
-	i2c_set_clientdata(client, ad193x);
-
-	return snd_soc_register_codec(&client->dev, &soc_codec_dev_ad193x,
-			&ad193x_dai, 1);
-}
-
-static int ad193x_i2c_remove(struct i2c_client *client)
-{
-	snd_soc_unregister_codec(&client->dev);
-	return 0;
-}
+	ad193x->regmap = regmap;
 
-static struct i2c_driver ad193x_i2c_driver = {
-	.driver = {
-		.name = "ad193x",
-	},
-	.probe    = ad193x_i2c_probe,
-	.remove   = ad193x_i2c_remove,
-	.id_table = ad193x_id,
-};
-#endif
-
-static int __init ad193x_modinit(void)
-{
-	int ret;
-
-#if IS_ENABLED(CONFIG_I2C)
-	ret =  i2c_add_driver(&ad193x_i2c_driver);
-	if (ret != 0) {
-		printk(KERN_ERR "Failed to register AD193X I2C driver: %d\n",
-				ret);
-	}
-#endif
-
-#if defined(CONFIG_SPI_MASTER)
-	ret = spi_register_driver(&ad193x_spi_driver);
-	if (ret != 0) {
-		printk(KERN_ERR "Failed to register AD193X SPI driver: %d\n",
-				ret);
-	}
-#endif
-	return ret;
-}
-module_init(ad193x_modinit);
-
-static void __exit ad193x_modexit(void)
-{
-#if defined(CONFIG_SPI_MASTER)
-	spi_unregister_driver(&ad193x_spi_driver);
-#endif
+	dev_set_drvdata(dev, ad193x);
 
-#if IS_ENABLED(CONFIG_I2C)
-	i2c_del_driver(&ad193x_i2c_driver);
-#endif
+	return snd_soc_register_codec(dev, &soc_codec_dev_ad193x,
+		&ad193x_dai, 1);
 }
-module_exit(ad193x_modexit);
+EXPORT_SYMBOL_GPL(ad193x_probe);
 
 MODULE_DESCRIPTION("ASoC ad193x driver");
 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");