At Tue, 9 Sep 2008 15:58:27 +0800, Harald Welte wrote:
[ALSA] HDA VIA: Add "Independent Headphone" mode
This mode allows an output stream to have two substreams, one for the speakers and one for the headphone. Each of the substreams has independent PCM data and uses a different DAC.
Signed-off-by: Harald Welte HaraldWelte@viatech.com
Index: linux-2.6/sound/pci/hda/patch_via.c
--- linux-2.6.orig/sound/pci/hda/patch_via.c +++ linux-2.6/sound/pci/hda/patch_via.c @@ -33,6 +33,7 @@ /* 2008-02-03 Lydia Wang Fix Rear channels and Back channels inverse issue */ /* 2008-03-06 Lydia Wang Add VT1702 codec and VT1708S codec support */ /* 2008-04-09 Lydia Wang Add mute front speaker when HP plugin */ +/* 2008-04-09 Lydia Wang Add Independent HP feature */ /* */ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
@@ -41,6 +42,7 @@ #include <linux/delay.h> #include <linux/slab.h> #include <sound/core.h> +#include <sound/asoundef.h> #include "hda_codec.h" #include "hda_local.h" #include "hda_patch.h" @@ -140,9 +142,13 @@ struct auto_pin_cfg autocfg; unsigned int num_kctl_alloc, num_kctl_used; struct snd_kcontrol_new *kctl_alloc;
- struct hda_input_mux private_imux;
struct hda_input_mux private_imux[2]; hda_nid_t private_dac_nids[AUTO_CFG_MAX_OUTS];
/* HP mode source */
const struct hda_input_mux *hp_mux;
unsigned int hp_independent_mode;
#ifdef CONFIG_SND_HDA_POWER_SAVE struct hda_loopback_check loopback; #endif @@ -326,6 +332,92 @@ &spec->cur_mux[adc_idx]); }
+static int via_independent_hp_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)+{
- struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
- struct via_spec *spec = codec->spec;
- return snd_hda_input_mux_info(spec->hp_mux, uinfo);
+}
Usually this kind of "switch" is implemented as a boolean switch since some mixer apps aren't capable to handle enum controls.
If you'd like to change to that, please send an additional patch as I already committed these.
thanks,
Takashi