396a2e79cd
[This will be used by the ad193x driver to fix the fact that the original author of the driver put a bodge for their particular chip into a the generic ASoC register I/O abstraction layer which looked like an obvious bug which ended up getting fixed in 3.0. Sadly there were no comments documenting what was going on. A minimally invasive correction to the driver is to remove the register cache support and go direct to the hardware all the time so we're adding a new feature -- broonie] Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
163 lines
4.3 KiB
C
163 lines
4.3 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 <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 ret;
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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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/* Primitive bulk write support for soc-cache. The data pointed to by
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* `data' needs to already be in the form the hardware expects. Any
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* data written through this function will not go through the cache as
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* it only handles writing to volatile or out of bounds registers.
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*
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* This is currently only supported for devices using the regmap API
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* wrappers.
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*/
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static int snd_soc_hw_bulk_write_raw(struct snd_soc_codec *codec,
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unsigned int reg,
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const void *data, size_t len)
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{
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/* To ensure that we don't get out of sync with the cache, check
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* whether the base register is volatile or if we've directly asked
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* to bypass the cache. Out of bounds registers are considered
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* volatile.
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*/
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if (!codec->cache_bypass
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&& !snd_soc_codec_volatile_register(codec, reg)
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&& reg < codec->driver->reg_cache_size)
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return -EINVAL;
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return regmap_raw_write(codec->control_data, reg, data, len);
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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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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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codec->bulk_write_raw = snd_soc_hw_bulk_write_raw;
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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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break;
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default:
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return -EINVAL;
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}
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if (IS_ERR(codec->control_data))
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return PTR_ERR(codec->control_data);
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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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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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