forked from Minki/linux
6e6ace00a0
If a register isn't cached then let callers know that so they can fall back or error handle appropriately. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* Register cache access API - indexed caching support
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/slab.h>
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#include "internal.h"
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static int regcache_indexed_read(struct regmap *map, unsigned int reg,
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unsigned int *value)
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{
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int ret;
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ret = regcache_lookup_reg(map, reg);
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if (ret >= 0)
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*value = map->reg_defaults[ret].def;
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return ret;
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}
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static int regcache_indexed_write(struct regmap *map, unsigned int reg,
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unsigned int value)
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{
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int ret;
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ret = regcache_lookup_reg(map, reg);
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if (ret < 0)
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return regcache_insert_reg(map, reg, value);
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map->reg_defaults[ret].def = value;
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return 0;
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}
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static int regcache_indexed_sync(struct regmap *map)
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{
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unsigned int i;
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int ret;
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for (i = 0; i < map->num_reg_defaults; i++) {
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ret = _regmap_write(map, map->reg_defaults[i].reg,
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map->reg_defaults[i].def);
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if (ret < 0)
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return ret;
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dev_dbg(map->dev, "Synced register %#x, value %#x\n",
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map->reg_defaults[i].reg,
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map->reg_defaults[i].def);
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}
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return 0;
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}
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struct regcache_ops regcache_indexed_ops = {
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.type = REGCACHE_INDEXED,
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.name = "indexed",
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.read = regcache_indexed_read,
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.write = regcache_indexed_write,
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.sync = regcache_indexed_sync
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};
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