/* * Register cache access API - flat caching support * * Copyright 2012 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 version 2 as * published by the Free Software Foundation. */ #include <linux/device.h>#include <linux/seq_file.h>#include <linux/slab.h> #include "internal.h" static inline unsigned int regcache_flat_get_index(const struct regmap *map,						   unsigned int reg){	return regcache_get_index_by_order(map, reg);} static int regcache_flat_init(struct regmap *map){	int i;	unsigned int *cache; 	if (!map || map->reg_stride_order < 0 || !map->max_register)		return -EINVAL; 	map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)			     + 1, sizeof(unsigned int), GFP_KERNEL);	if (!map->cache)		return -ENOMEM; 	cache = map->cache; 	for (i = 0; i < map->num_reg_defaults; i++)		cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] =				map->reg_defaults[i].def; 	return 0;} static int regcache_flat_exit(struct regmap *map){	kfree(map->cache);	map->cache = NULL; 	return 0;} static int regcache_flat_read(struct regmap *map,			      unsigned int reg, unsigned int *value){	unsigned int *cache = map->cache; 	*value = cache[regcache_flat_get_index(map, reg)]; 	return 0;} static int regcache_flat_write(struct regmap *map, unsigned int reg,			       unsigned int value){	unsigned int *cache = map->cache; 	cache[regcache_flat_get_index(map, reg)] = value; 	return 0;} struct regcache_ops regcache_flat_ops = {	.type = REGCACHE_FLAT,	.name = "flat",	.init = regcache_flat_init,	.exit = regcache_flat_exit,	.read = regcache_flat_read,	.write = regcache_flat_write,};