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authorDimitris Papastamos <dp@opensource.wolfsonmicro.com>2011-01-13 12:20:36 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-01-13 14:17:32 +0000
commit066d16c3e8194677a9aaeb06a45e4014387d16f1 (patch)
treefbdd51ab4478d56fdba8d3c30a381c248a5a3718 /sound/soc/soc-cache.c
parent3e8e2cc45c9d6b5c1265838a8cff701815321dbc (diff)
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ASoC: soc-cache: Add support for default readable()/volatile() functions
For common scenarios, device drivers can provide a table of all the registers that are at least either readable/writable/volatile. The idea is that if a register lookup fails, all of its read/write/vol members will be zero and will be treated as default. This also reduces the size of the register access array. Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/soc-cache.c')
-rw-r--r--sound/soc/soc-cache.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 1a36b36c5ba..d97a59f6a24 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -1603,3 +1603,52 @@ int snd_soc_cache_sync(struct snd_soc_codec *codec)
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
+
+static int snd_soc_get_reg_access_index(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ const struct snd_soc_codec_driver *codec_drv;
+ unsigned int min, max, index;
+
+ codec_drv = codec->driver;
+ min = 0;
+ max = codec_drv->reg_access_size - 1;
+ do {
+ index = (min + max) / 2;
+ if (codec_drv->reg_access_default[index].reg == reg)
+ return index;
+ if (codec_drv->reg_access_default[index].reg < reg)
+ min = index + 1;
+ else
+ max = index;
+ } while (min <= max);
+ return -1;
+}
+
+int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ int index;
+
+ if (reg >= codec->driver->reg_cache_size)
+ return 1;
+ index = snd_soc_get_reg_access_index(codec, reg);
+ if (index < 0)
+ return 0;
+ return codec->driver->reg_access_default[index].vol;
+}
+EXPORT_SYMBOL_GPL(snd_soc_default_volatile_register);
+
+int snd_soc_default_readable_register(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ int index;
+
+ if (reg >= codec->driver->reg_cache_size)
+ return 1;
+ index = snd_soc_get_reg_access_index(codec, reg);
+ if (index < 0)
+ return 0;
+ return codec->driver->reg_access_default[index].read;
+}
+EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);