path: root/sound/soc/soc-cache.c

/*
 * soc-cache.c  --  ASoC register cache helpers
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <sound/soc.h>
#include <linux/lzo.h>
#include <linux/bitmap.h>
#include <linux/rbtree.h>

#include <trace/events/asoc.h>

static bool snd_soc_set_cache_val(void *base, unsigned int idx,
				  unsigned int val, unsigned int word_size)
{
	switch (word_size) {
	case 1: {
		u8 *cache = base;
		if (cache[idx] == val)
			return true;
		cache[idx] = val;
		break;
	}
	case 2: {
		u16 *cache = base;
		if (cache[idx] == val)
			return true;
		cache[idx] = val;
		break;
	}
	default:
		BUG();
	}
	return false;
}

static unsigned int snd_soc_get_cache_val(const void *base, unsigned int idx,
		unsigned int word_size)
{
	if (!base)
		return -1;

	switch (word_size) {
	case 1: {
		const u8 *cache = base;
		return cache[idx];
	}
	case 2: {
		const u16 *cache = base;
		return cache[idx];
	}
	default:
		BUG();
	}
	/* unreachable */
	return -1;
}

struct snd_soc_rbtree_node {
	struct rb_node node; /* the actual rbtree node holding this block */
	unsigned int base_reg; /* base register handled by this block */
	unsigned int word_size; /* number of bytes needed to represent the register index */
	void *block; /* block of adjacent registers */
	unsigned int blklen; /* number of registers available in the block */
} __attribute__ ((packed));

struct snd_soc_rbtree_ctx {
	struct rb_root root;
	struct snd_soc_rbtree_node *cached_rbnode;
};

static inline void snd_soc_rbtree_get_base_top_reg(
	struct snd_soc_rbtree_node *rbnode,
	unsigned int *base, unsigned int *top)
{
	*base = rbnode->base_reg;
	*top = rbnode->base_reg + rbnode->blklen - 1;
}

static unsigned int snd_soc_rbtree_get_register(
	struct snd_soc_rbtree_node *rbnode, unsigned int idx)
{
	unsigned int val;

	switch (rbnode->word_size) {
	case 1: {
		u8 *p = rbnode->block;
		val = p[idx];
		return val;
	}
	case 2: {
		u16 *p = rbnode->block;
		val = p[idx];
		return val;
	}
	default:
		BUG();
		break;
	}
	return -1;
}

static void snd_soc_rbtree_set_register(struct snd_soc_rbtree_node *rbnode,
					unsigned int idx, unsigned int val)
{
	switch (rbnode->word_size) {
	case 1: {
		u8 *p = rbnode->block;
		p[idx] = val;
		break;
	}
	case 2: {
		u16 *p = rbnode->block;
		p[idx] = val;
		break;
	}
	default:
		BUG();
		break;
	}
}

static struct snd_soc_rbtree_node *snd_soc_rbtree_lookup(
	</