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0ec74ad3c1
When regmap consists of single register, 'regmap' subsystem is unable to understand whether ->max_register is set or not, because in both cases it is equal to zero. It leads to that the logic based on value of ->max_register doesn't work. For example using of REGCACHE_FLAT fails. This patch introduces an extra parameter to regmap config, indicating that zero value in ->max_register is authentic. Signed-off-by: Jan Dakinevich <jan.dakinevich@salutedevices.com> Link: https://lore.kernel.org/r/20240126200836.1829995-1-jan.dakinevich@salutedevices.com Signed-off-by: Mark Brown <broonie@kernel.org>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Register cache access API - flat caching support
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//
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// Copyright 2012 Wolfson Microelectronics plc
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//
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// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include "internal.h"
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static inline unsigned int regcache_flat_get_index(const struct regmap *map,
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unsigned int reg)
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{
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return regcache_get_index_by_order(map, reg);
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}
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static int regcache_flat_init(struct regmap *map)
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{
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int i;
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unsigned int *cache;
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if (!map || map->reg_stride_order < 0 || !map->max_register_is_set)
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return -EINVAL;
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map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
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+ 1, sizeof(unsigned int), GFP_KERNEL);
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if (!map->cache)
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return -ENOMEM;
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cache = map->cache;
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for (i = 0; i < map->num_reg_defaults; i++) {
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unsigned int reg = map->reg_defaults[i].reg;
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unsigned int index = regcache_flat_get_index(map, reg);
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cache[index] = map->reg_defaults[i].def;
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}
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return 0;
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}
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static int regcache_flat_exit(struct regmap *map)
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{
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kfree(map->cache);
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map->cache = NULL;
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return 0;
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}
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static int regcache_flat_read(struct regmap *map,
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unsigned int reg, unsigned int *value)
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{
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unsigned int *cache = map->cache;
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unsigned int index = regcache_flat_get_index(map, reg);
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*value = cache[index];
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return 0;
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}
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static int regcache_flat_write(struct regmap *map, unsigned int reg,
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unsigned int value)
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{
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unsigned int *cache = map->cache;
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unsigned int index = regcache_flat_get_index(map, reg);
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cache[index] = value;
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return 0;
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}
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struct regcache_ops regcache_flat_ops = {
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.type = REGCACHE_FLAT,
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.name = "flat",
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.init = regcache_flat_init,
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.exit = regcache_flat_exit,
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.read = regcache_flat_read,
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.write = regcache_flat_write,
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};
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