It is defined in .h file and used in .c file.
It is made so because defining static data variables in .h file
is a bad style in general and in this case will result in build-time
warnings in particular.
Therefore definition of hda_preset_tables[] is moved to .c file.
It looks like this:
static const struct hda_codec_preset *const hda_preset_tables[] = {
snd_hda_preset_realtek,
snd_hda_preset_cmedia,
snd_hda_preset_analog,
snd_hda_preset_sigmatel,
snd_hda_preset_si3054,
snd_hda_preset_atihdmi,
snd_hda_preset_conexant,
snd_hda_preset_via,
NULL
};
I want to make it easier for people to add new snd_hda_preset_XXX.
I don't want them to be forced to add it in hda_patch.h first,
and then go to hda_codec.c and add it there too.
Therefore I turned this list into a #define which sits in hda_patch.h:
#define SND_HDA_PRESETS \
snd_hda_preset_realtek, \
snd_hda_preset_cmedia, \
snd_hda_preset_analog, \
snd_hda_preset_sigmatel, \
snd_hda_preset_si3054, \
snd_hda_preset_atihdmi, \
snd_hda_preset_conexant, \
snd_hda_preset_via
Now if you want to add yet another snd_hda_preset_XXX, you
don't need to touch hda_codec.c.
Original code was achieving the same by cheating: it has
static const struct hda_codec_preset *hda_preset_tables[] = {...}
in hda_patch.h.
--
vda
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