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ALSA: emu10k1 - Add capture boost mixer switch for Audigy

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Due to the conversion (drop) from 24bit in the DSP to 16bit in AC97,
the maximum capture level on Audigy seems lower than it could be.

This patch adds a workaround to enable the artificial capture boost
switch.  When this switch is on, the whole analog capature level is
boost up.  However, this results in the lower capture resolution.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-12-02 09:31:16 +01:00
parent 13d428afc0
commit 16950e09cf
1 changed files with 46 additions and 0 deletions
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46
sound/pci/emu10k1/emumixer.c
View file

@ -1639,6 +1639,45 @@ static struct snd_kcontrol_new snd_audigy_shared_spdif __devinitdata =
.put = snd_emu10k1_shared_spdif_put
};
/* workaround for too low volume on Audigy due to 16bit/24bit conversion */
#define snd_audigy_capture_boost_info snd_ctl_boolean_mono_info
static int snd_audigy_capture_boost_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
unsigned int val;
/* FIXME: better to use a cached version */
val = snd_ac97_read(emu->ac97, AC97_REC_GAIN);
ucontrol->value.integer.value[0] = !!val;
return 0;
}
static int snd_audigy_capture_boost_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
unsigned int val;
if (ucontrol->value.integer.value[0])
val = 0x0f0f;
else
val = 0;
return snd_ac97_update(emu->ac97, AC97_REC_GAIN, val);
}
static struct snd_kcontrol_new snd_audigy_capture_boost __devinitdata =
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "Analog Capture Boost",
.info = snd_audigy_capture_boost_info,
.get = snd_audigy_capture_boost_get,
.put = snd_audigy_capture_boost_put
};
/*
*/
static void snd_emu10k1_mixer_free_ac97(struct snd_ac97 *ac97)
@ -2087,5 +2126,12 @@ int __devinit snd_emu10k1_mixer(struct snd_emu10k1 *emu,
}
}
if (emu->card_capabilities->ac97_chip && emu->audigy) {
err = snd_ctl_add(card, snd_ctl_new1(&snd_audigy_capture_boost,
emu));
if (err < 0)
return err;
}
return 0;
}