Root/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

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