94 строки
2.3 KiB
C
94 строки
2.3 KiB
C
/*
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* soc-io.c -- ASoC register I/O helpers
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*
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* Copyright 2009-2011 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/i2c.h>
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#include <linux/spi/spi.h>
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#include <linux/regmap.h>
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#include <linux/export.h>
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#include <sound/soc.h>
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#include <trace/events/asoc.h>
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#ifdef CONFIG_REGMAP
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static int hw_write(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int value)
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{
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return regmap_write(codec->control_data, reg, value);
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}
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static unsigned int hw_read(struct snd_soc_codec *codec, unsigned int reg)
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{
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int ret;
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unsigned int val;
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ret = regmap_read(codec->control_data, reg, &val);
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if (ret == 0)
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return val;
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else
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return -1;
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}
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/**
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* snd_soc_codec_set_cache_io: Set up standard I/O functions.
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*
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* @codec: CODEC to configure.
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* @map: Register map to write to
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*
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* Register formats are frequently shared between many I2C and SPI
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* devices. In order to promote code reuse the ASoC core provides
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* some standard implementations of CODEC read and write operations
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* which can be set up using this function.
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*
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* The caller is responsible for allocating and initialising the
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* actual cache.
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*
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* Note that at present this code cannot be used by CODECs with
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* volatile registers.
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*/
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int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
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struct regmap *regmap)
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{
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int ret;
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/* Device has made its own regmap arrangements */
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if (!regmap)
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codec->control_data = dev_get_regmap(codec->dev, NULL);
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else
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codec->control_data = regmap;
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if (IS_ERR(codec->control_data))
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return PTR_ERR(codec->control_data);
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codec->write = hw_write;
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codec->read = hw_read;
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ret = regmap_get_val_bytes(codec->control_data);
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/* Errors are legitimate for non-integer byte
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* multiples */
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if (ret > 0)
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codec->val_bytes = ret;
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codec->using_regmap = true;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
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#else
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int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
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struct regmap *regmap)
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{
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return -ENOTSUPP;
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}
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EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
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#endif
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