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authorLars-Peter Clausen <lars@metafoo.de>2014-02-17 16:16:54 +0400
committerMark Brown <broonie@linaro.org>2014-02-18 05:04:37 +0400
commit6c3d713e6d32706999689e379a9098afb4cd8a2c (patch)
tree7f26da80df69fbd48f53835924be036f161f63f3 /sound/soc/codecs/ad193x-spi.c
parent38dbfb59d1175ef458d006556061adeaa8751b72 (diff)
downloadlinux-6c3d713e6d32706999689e379a9098afb4cd8a2c.tar.xz
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>
Diffstat (limited to 'sound/soc/codecs/ad193x-spi.c')
-rw-r--r--sound/soc/codecs/ad193x-spi.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/sound/soc/codecs/ad193x-spi.c b/sound/soc/codecs/ad193x-spi.c
new file mode 100644
index 000000000000..390cef9b9dc2
--- /dev/null
+++ b/sound/soc/codecs/ad193x-spi.c
@@ -0,0 +1,48 @@
+/*
+ * AD1938/AD1939 audio driver
+ *
+ * Copyright 2014 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+
+#include <sound/soc.h>
+
+#include "ad193x.h"
+
+static int ad193x_spi_probe(struct spi_device *spi)
+{
+ struct regmap_config config;
+
+ config = ad193x_regmap_config;
+ config.val_bits = 8;
+ config.reg_bits = 16;
+ config.read_flag_mask = 0x09;
+ config.write_flag_mask = 0x08;
+
+ return ad193x_probe(&spi->dev, devm_regmap_init_spi(spi, &config));
+}
+
+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,
+};
+module_spi_driver(ad193x_spi_driver);
+
+MODULE_DESCRIPTION("ASoC AD1938/AD1939 audio CODEC driver");
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_LICENSE("GPL");