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ALSA: hda - introduce snd_hda_jack_detect() and snd_hda_pin_sense()

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This helps merge duplicate code.

v2: add snd_hda_jack_detect() and comments recommended by Takashi.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wu Fengguang
2009-11-18 12:38:02 +08:00
committed by Takashi Iwai
parent 23ccc2bd24
commit 864f92be7e
5 changed files with 91 additions and 177 deletions
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34
sound/pci/hda/hda_codec.c
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@@ -1317,6 +1317,40 @@ u32 snd_hda_query_pin_caps(struct hda_codec *codec, hda_nid_t nid)
}
EXPORT_SYMBOL_HDA(snd_hda_query_pin_caps);
/**
* snd_hda_pin_sense - execute pin sense measurement
* @codec: the CODEC to sense
* @nid: the pin NID to sense
*
* Execute necessary pin sense measurement and return its Presence Detect,
* Impedance, ELD Valid etc. status bits.
*/
u32 snd_hda_pin_sense(struct hda_codec *codec, hda_nid_t nid)
{
u32 pincap = snd_hda_query_pin_caps(codec, nid);
if (pincap & AC_PINCAP_TRIG_REQ) /* need trigger? */
snd_hda_codec_read(codec, nid, 0, AC_VERB_SET_PIN_SENSE, 0);
return snd_hda_codec_read(codec, nid, 0,
AC_VERB_GET_PIN_SENSE, 0);
}
EXPORT_SYMBOL_HDA(snd_hda_pin_sense);
/**
* snd_hda_jack_detect - query pin Presence Detect status
* @codec: the CODEC to sense
* @nid: the pin NID to sense
*
* Query and return the pin's Presence Detect status.
*/
int snd_hda_jack_detect(struct hda_codec *codec, hda_nid_t nid)
{
u32 sense = snd_hda_pin_sense(codec, nid);
return !!(sense & AC_PINSENSE_PRESENCE);
}
EXPORT_SYMBOL_HDA(snd_hda_jack_detect);
/*
* read the current volume to info
* if the cache exists, read the cache value.