![Mark Brown](/assets/img/avatar_default.png)
All users now use regmap directly so delete the ASoC version of the code. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
341 lines
7.8 KiB
C
341 lines
7.8 KiB
C
/*
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* soc-cache.c -- ASoC register cache helpers
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*
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* Copyright 2009 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 <sound/soc.h>
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#include <linux/bitmap.h>
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#include <linux/rbtree.h>
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#include <linux/export.h>
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#include <trace/events/asoc.h>
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static bool snd_soc_set_cache_val(void *base, unsigned int idx,
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unsigned int val, unsigned int word_size)
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{
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switch (word_size) {
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case 1: {
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u8 *cache = base;
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if (cache[idx] == val)
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return true;
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cache[idx] = val;
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break;
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}
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case 2: {
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u16 *cache = base;
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if (cache[idx] == val)
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return true;
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cache[idx] = val;
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break;
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}
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default:
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BUG();
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}
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return false;
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}
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static unsigned int snd_soc_get_cache_val(const void *base, unsigned int idx,
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unsigned int word_size)
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{
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if (!base)
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return -1;
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switch (word_size) {
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case 1: {
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const u8 *cache = base;
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return cache[idx];
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}
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case 2: {
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const u16 *cache = base;
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return cache[idx];
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}
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default:
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BUG();
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}
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/* unreachable */
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return -1;
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}
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static int snd_soc_flat_cache_sync(struct snd_soc_codec *codec)
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{
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int i;
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int ret;
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const struct snd_soc_codec_driver *codec_drv;
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unsigned int val;
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codec_drv = codec->driver;
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for (i = 0; i < codec_drv->reg_cache_size; ++i) {
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ret = snd_soc_cache_read(codec, i, &val);
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if (ret)
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return ret;
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if (codec->reg_def_copy)
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if (snd_soc_get_cache_val(codec->reg_def_copy,
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i, codec_drv->reg_word_size) == val)
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continue;
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WARN_ON(!snd_soc_codec_writable_register(codec, i));
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ret = snd_soc_write(codec, i, val);
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if (ret)
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return ret;
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dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
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i, val);
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}
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return 0;
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}
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static int snd_soc_flat_cache_write(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int value)
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{
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snd_soc_set_cache_val(codec->reg_cache, reg, value,
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codec->driver->reg_word_size);
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return 0;
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}
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static int snd_soc_flat_cache_read(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int *value)
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{
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*value = snd_soc_get_cache_val(codec->reg_cache, reg,
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codec->driver->reg_word_size);
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return 0;
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}
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static int snd_soc_flat_cache_exit(struct snd_soc_codec *codec)
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{
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if (!codec->reg_cache)
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return 0;
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kfree(codec->reg_cache);
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codec->reg_cache = NULL;
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return 0;
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}
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static int snd_soc_flat_cache_init(struct snd_soc_codec *codec)
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{
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if (codec->reg_def_copy)
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codec->reg_cache = kmemdup(codec->reg_def_copy,
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codec->reg_size, GFP_KERNEL);
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else
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codec->reg_cache = kzalloc(codec->reg_size, GFP_KERNEL);
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if (!codec->reg_cache)
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return -ENOMEM;
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return 0;
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}
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/* an array of all supported compression types */
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static const struct snd_soc_cache_ops cache_types[] = {
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/* Flat *must* be the first entry for fallback */
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{
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.id = SND_SOC_FLAT_COMPRESSION,
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.name = "flat",
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.init = snd_soc_flat_cache_init,
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.exit = snd_soc_flat_cache_exit,
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.read = snd_soc_flat_cache_read,
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.write = snd_soc_flat_cache_write,
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.sync = snd_soc_flat_cache_sync
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},
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};
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int snd_soc_cache_init(struct snd_soc_codec *codec)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(cache_types); ++i)
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if (cache_types[i].id == codec->compress_type)
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break;
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/* Fall back to flat compression */
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if (i == ARRAY_SIZE(cache_types)) {
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dev_warn(codec->dev, "Could not match compress type: %d\n",
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codec->compress_type);
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i = 0;
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}
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mutex_init(&codec->cache_rw_mutex);
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codec->cache_ops = &cache_types[i];
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if (codec->cache_ops->init) {
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if (codec->cache_ops->name)
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dev_dbg(codec->dev, "Initializing %s cache for %s codec\n",
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codec->cache_ops->name, codec->name);
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return codec->cache_ops->init(codec);
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}
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return -ENOSYS;
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}
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/*
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* NOTE: keep in mind that this function might be called
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* multiple times.
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*/
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int snd_soc_cache_exit(struct snd_soc_codec *codec)
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{
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if (codec->cache_ops && codec->cache_ops->exit) {
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if (codec->cache_ops->name)
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dev_dbg(codec->dev, "Destroying %s cache for %s codec\n",
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codec->cache_ops->name, codec->name);
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return codec->cache_ops->exit(codec);
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}
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return -ENOSYS;
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}
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/**
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* snd_soc_cache_read: Fetch the value of a given register from the cache.
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*
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* @codec: CODEC to configure.
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* @reg: The register index.
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* @value: The value to be returned.
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*/
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int snd_soc_cache_read(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int *value)
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{
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int ret;
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mutex_lock(&codec->cache_rw_mutex);
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if (value && codec->cache_ops && codec->cache_ops->read) {
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ret = codec->cache_ops->read(codec, reg, value);
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mutex_unlock(&codec->cache_rw_mutex);
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return ret;
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}
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mutex_unlock(&codec->cache_rw_mutex);
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(snd_soc_cache_read);
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/**
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* snd_soc_cache_write: Set the value of a given register in the cache.
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*
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* @codec: CODEC to configure.
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* @reg: The register index.
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* @value: The new register value.
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*/
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int snd_soc_cache_write(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int value)
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{
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int ret;
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mutex_lock(&codec->cache_rw_mutex);
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if (codec->cache_ops && codec->cache_ops->write) {
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ret = codec->cache_ops->write(codec, reg, value);
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mutex_unlock(&codec->cache_rw_mutex);
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return ret;
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}
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mutex_unlock(&codec->cache_rw_mutex);
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(snd_soc_cache_write);
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/**
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* snd_soc_cache_sync: Sync the register cache with the hardware.
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*
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* @codec: CODEC to configure.
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*
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* Any registers that should not be synced should be marked as
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* volatile. In general drivers can choose not to use the provided
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* syncing functionality if they so require.
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*/
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int snd_soc_cache_sync(struct snd_soc_codec *codec)
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{
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int ret;
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const char *name;
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if (!codec->cache_sync) {
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return 0;
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}
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if (!codec->cache_ops || !codec->cache_ops->sync)
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return -ENOSYS;
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if (codec->cache_ops->name)
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name = codec->cache_ops->name;
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else
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name = "unknown";
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if (codec->cache_ops->name)
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dev_dbg(codec->dev, "Syncing %s cache for %s codec\n",
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codec->cache_ops->name, codec->name);
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trace_snd_soc_cache_sync(codec, name, "start");
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ret = codec->cache_ops->sync(codec);
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if (!ret)
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codec->cache_sync = 0;
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trace_snd_soc_cache_sync(codec, name, "end");
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
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static int snd_soc_get_reg_access_index(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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const struct snd_soc_codec_driver *codec_drv;
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unsigned int min, max, index;
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codec_drv = codec->driver;
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min = 0;
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max = codec_drv->reg_access_size - 1;
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do {
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index = (min + max) / 2;
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if (codec_drv->reg_access_default[index].reg == reg)
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return index;
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if (codec_drv->reg_access_default[index].reg < reg)
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min = index + 1;
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else
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max = index;
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} while (min <= max);
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return -1;
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}
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int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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int index;
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if (reg >= codec->driver->reg_cache_size)
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return 1;
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index = snd_soc_get_reg_access_index(codec, reg);
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if (index < 0)
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return 0;
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return codec->driver->reg_access_default[index].vol;
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}
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EXPORT_SYMBOL_GPL(snd_soc_default_volatile_register);
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int snd_soc_default_readable_register(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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int index;
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if (reg >= codec->driver->reg_cache_size)
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return 1;
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index = snd_soc_get_reg_access_index(codec, reg);
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if (index < 0)
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return 0;
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return codec->driver->reg_access_default[index].read;
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}
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EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);
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int snd_soc_default_writable_register(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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int index;
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if (reg >= codec->driver->reg_cache_size)
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return 1;
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index = snd_soc_get_reg_access_index(codec, reg);
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if (index < 0)
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return 0;
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return codec->driver->reg_access_default[index].write;
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}
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EXPORT_SYMBOL_GPL(snd_soc_default_writable_register);
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