LXR linux/drivers/base/regmap/regcache-flat.c

   1/*
   2 * Register cache access API - flat caching support
   3 *
   4 * Copyright 2012 Wolfson Microelectronics plc
   5 *
   6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/slab.h>
  14#include <linux/device.h>
  15#include <linux/seq_file.h>
  16
  17#include "internal.h"
  18
  19static int regcache_flat_init(struct regmap *map)
  20{
  21        int i;
  22        unsigned int *cache;
  23
  24        map->cache = kzalloc(sizeof(unsigned int) * (map->max_register + 1),
  25                             GFP_KERNEL);
  26        if (!map->cache)
  27                return -ENOMEM;
  28
  29        cache = map->cache;
  30
  31        for (i = 0; i < map->num_reg_defaults; i++)
  32                cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;
  33
  34        return 0;
  35}
  36
  37static int regcache_flat_exit(struct regmap *map)
  38{
  39        kfree(map->cache);
  40        map->cache = NULL;
  41
  42        return 0;
  43}
  44
  45static int regcache_flat_read(struct regmap *map,
  46                              unsigned int reg, unsigned int *value)
  47{
  48        unsigned int *cache = map->cache;
  49
  50        *value = cache[reg];
  51
  52        return 0;
  53}
  54
  55static int regcache_flat_write(struct regmap *map, unsigned int reg,
  56                               unsigned int value)
  57{
  58        unsigned int *cache = map->cache;
  59
  60        cache[reg] = value;
  61
  62        return 0;
  63}
  64
  65struct regcache_ops regcache_flat_ops = {
  66        .type = REGCACHE_FLAT,
  67        .name = "flat",
  68        .init = regcache_flat_init,
  69        .exit = regcache_flat_exit,
  70        .read = regcache_flat_read,
  71        .write = regcache_flat_write,
  72};
  73