147 lines
3.6 KiB
C
147 lines
3.6 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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int ret;
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if (!snd_soc_codec_volatile_register(codec, reg) &&
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reg < codec->driver->reg_cache_size &&
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!codec->cache_bypass) {
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ret = snd_soc_cache_write(codec, reg, value);
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if (ret < 0)
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return -1;
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}
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if (codec->cache_only) {
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codec->cache_sync = 1;
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return 0;
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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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if (reg >= codec->driver->reg_cache_size ||
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snd_soc_codec_volatile_register(codec, reg) ||
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codec->cache_bypass) {
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if (codec->cache_only)
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return -1;
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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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ret = snd_soc_cache_read(codec, reg, &val);
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if (ret < 0)
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return -1;
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return val;
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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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* @addr_bits: Number of bits of register address data.
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* @data_bits: Number of bits of data per register.
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* @control: Control bus used.
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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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int addr_bits, int data_bits,
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enum snd_soc_control_type control)
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{
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struct regmap_config config;
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int ret;
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memset(&config, 0, sizeof(config));
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codec->write = hw_write;
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codec->read = hw_read;
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config.reg_bits = addr_bits;
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config.val_bits = data_bits;
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switch (control) {
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#if defined(CONFIG_REGMAP_I2C) || defined(CONFIG_REGMAP_I2C_MODULE)
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case SND_SOC_I2C:
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codec->control_data = regmap_init_i2c(to_i2c_client(codec->dev),
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&config);
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break;
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#endif
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#if defined(CONFIG_REGMAP_SPI) || defined(CONFIG_REGMAP_SPI_MODULE)
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case SND_SOC_SPI:
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codec->control_data = regmap_init_spi(to_spi_device(codec->dev),
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&config);
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break;
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#endif
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case SND_SOC_REGMAP:
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/* Device has made its own regmap arrangements */
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codec->using_regmap = true;
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if (!codec->control_data)
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codec->control_data = dev_get_regmap(codec->dev, NULL);
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if (codec->control_data) {
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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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}
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break;
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default:
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return -EINVAL;
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}
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return PTR_ERR_OR_ZERO(codec->control_data);
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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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int addr_bits, int data_bits,
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enum snd_soc_control_type control)
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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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