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/*
* Register cache access API - indexed caching support
*
* Copyright 2011 Wolfson Microelectronics plc
*
* Author: Dimitris Papastamos <dp@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 version 2 as
* published by the Free Software Foundation.
*/
#include <linux/slab.h>
#include "internal.h"
static int regcache_indexed_read(struct regmap *map, unsigned int reg,
unsigned int *value)
{
int ret;
ret = regcache_lookup_reg(map, reg);
if (ret < 0)
*value = 0;
else
*value = map->reg_defaults[ret].def;
return 0;
}
static int regcache_indexed_write(struct regmap *map, unsigned int reg,
unsigned int value)
{
int ret;
ret = regcache_lookup_reg(map, reg);
if (ret < 0)
return regcache_insert_reg(map, reg, value);
map->reg_defaults[ret].def = value;
return 0;
}
static int regcache_indexed_sync(struct regmap *map)
{
unsigned int i;
int ret;
for (i = 0; i < map->num_reg_defaults; i++) {
ret = _regmap_write(map, map->reg_defaults[i].reg,
map->reg_defaults[i].def);
if (ret < 0)
return ret;
dev_dbg(map->dev, "Synced register %#x, value %#x\n",
map->reg_defaults[i].reg,
map->reg_defaults[i].def);
}
return 0;
}
struct regcache_ops regcache_indexed_ops = {
.type = REGCACHE_INDEXED,
.name = "indexed",
.read = regcache_indexed_read,
.write = regcache_indexed_write,
.sync = regcache_indexed_sync
};
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