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regmap: debugfs: Add support for dumping write only device registers

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Add support for dumping write only device registers in debugfs. This is
useful for audio codecs that have write only registers (like WM8731).
The logic that decides if a value can be printed is moved to
regmap_printable() function to allow for easier future updates.

Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cristian Birsan 2016-08-08 18:44:22 +03:00 committed by Mark Brown
parent 1ea975cf1e
commit 359a2f1760
1 changed files with 13 additions and 3 deletions
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16
drivers/base/regmap/regmap-debugfs.c
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@ -77,6 +77,17 @@ static void regmap_debugfs_free_dump_cache(struct regmap *map)
}
}
static bool regmap_printable(struct regmap *map, unsigned int reg)
{
if (regmap_precious(map, reg))
return false;
if (!regmap_readable(map, reg) && !regmap_cached(map, reg))
return false;
return true;
}
/*
* Work out where the start offset maps into register numbers, bearing
* in mind that we suppress hidden registers.
@ -105,8 +116,7 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
if (list_empty(&map->debugfs_off_cache)) {
for (; i <= map->max_register; i += map->reg_stride) {
/* Skip unprinted registers, closing off cache entry */
if (!regmap_readable(map, i) ||
regmap_precious(map, i)) {
if (!regmap_printable(map, i)) {
if (c) {
c->max = p - 1;
c->max_reg = i - map->reg_stride;
@ -204,7 +214,7 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
for (i = start_reg; i <= to; i += map->reg_stride) {
if (!regmap_readable(map, i))
if (!regmap_readable(map, i) && !regmap_cached(map, i))
continue;
if (regmap_precious(map, i))