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regmap: Implement writable register checks

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This is mainly intended to be used by devices which can dynamically
block register writes at runtime, for other devices there is usually
limited value.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2011-07-24 11:46:20 +01:00
parent fb2736bbae
commit 7330478127
1 changed files with 7 additions and 0 deletions
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7
drivers/base/regmap/regmap.c
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@ -211,6 +211,13 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
void *buf;
int ret = -ENOTSUPP;
size_t len;
int i;
/* Check for unwritable registers before we start */
if (map->writeable_reg)
for (i = 0; i < val_len / map->format.val_bytes; i++)
if (!map->writeable_reg(map->dev, reg + i))
return -EINVAL;
map->format.format_reg(map->work_buf, reg);