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Commit 73304781 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Implement writable register checks 



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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent fb2736bb

drivers/base/regmap/regmap.c

+7 −0
Original line number Diff line number Diff line
@@ -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);