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ALSA: hda - Add comments to new helper functions 

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2010-09-09 22:08:44 +02:00
parent a1c9851583
commit 990061c28a
1 changed files with 23 additions and 0 deletions
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23
sound/pci/hda/hda_codec.c
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@ -4654,6 +4654,14 @@ static int get_line_pin_attr(unsigned int def_conf)
return LINE_ATTR_NORMAL;
}
/**
* hda_get_input_pin_label - Give a label for the given input pin
*
* When check_location is true, the function checks the pin location
* for mic and line-in pins, and set an appropriate prefix like "Front",
* "Rear", "Internal".
*/
const char *hda_get_input_pin_label(struct hda_codec *codec, hda_nid_t pin,
int check_location)
{
@ -4720,6 +4728,14 @@ static int check_mic_location_need(struct hda_codec *codec,
return 0;
}
/**
* hda_get_autocfg_input_label - Get a label for the given input
*
* Get a label for the given input pin defined by the autocfg item.
* Unlike hda_get_input_pin_label(), this function checks all inputs
* defined in autocfg and avoids the redundant mic/line prefix as much as
* possible.
*/
const char *hda_get_autocfg_input_label(struct hda_codec *codec,
const struct auto_pin_cfg *cfg,
int input)
@ -4737,6 +4753,13 @@ const char *hda_get_autocfg_input_label(struct hda_codec *codec,
}
EXPORT_SYMBOL_HDA(hda_get_autocfg_input_label);
/**
* snd_hda_add_imux_item - Add an item to input_mux
*
* When the same label is used already in the existing items, the number
* suffix is appended to the label. This label index number is stored
* to type_idx when non-NULL pointer is given.
*/
int snd_hda_add_imux_item(struct hda_input_mux *imux, const char *label,
int index, int *type_idx)
{