6c3d713e6d
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>
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/*
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* AD1936/AD1937 audio driver
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*
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* Copyright 2014 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include <sound/soc.h>
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#include "ad193x.h"
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static const struct i2c_device_id ad193x_id[] = {
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{ "ad1936", 0 },
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{ "ad1937", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad193x_id);
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static int ad193x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct regmap_config config;
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config = ad193x_regmap_config;
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config.val_bits = 8;
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config.reg_bits = 8;
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return ad193x_probe(&client->dev, devm_regmap_init_i2c(client, &config));
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}
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static int ad193x_i2c_remove(struct i2c_client *client)
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{
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snd_soc_unregister_codec(&client->dev);
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return 0;
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}
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static struct i2c_driver ad193x_i2c_driver = {
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.driver = {
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.name = "ad193x",
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},
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.probe = ad193x_i2c_probe,
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.remove = ad193x_i2c_remove,
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.id_table = ad193x_id,
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};
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module_i2c_driver(ad193x_i2c_driver);
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MODULE_DESCRIPTION("ASoC AD1936/AD1937 audio CODEC driver");
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_LICENSE("GPL");
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