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>
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 1a36b36..d97a59f 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -1603,3 +1603,52 @@
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);