ALSA: echoaudio: remove line-out volume from vmixer cards

There is a long standing bug in the drivers for cards with a vmixer because
I overlooked a detail in the c++ generic driver by echoaudio. Those cards
do not have a line-out volume control. It is a virtual control provided by
the generic driver. The bug is harmless because the DSP just ignores the
command to change the volume.
*NB:* It breaks alsa-tools/echomixer. A patch for it will follow.

This patch removes the line-out volume control from vmixer-equipped cards.

Signed-off-by: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 8dbc5c4..4b70ea1 100644 (file)
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -950,6 +950,8 @@ static int __devinit snd_echo_new_pcm(struct echoaudio *chip)
        Control interface
 ******************************************************************************/
 
+#ifndef ECHOCARD_HAS_VMIXER
+
 /******************* PCM output volume *******************/
 static int snd_echo_output_gain_info(struct snd_kcontrol *kcontrol,
                                     struct snd_ctl_elem_info *uinfo)
@@ -1001,18 +1003,6 @@ static int snd_echo_output_gain_put(struct snd_kcontrol *kcontrol,
        return changed;
 }
 
-#ifdef ECHOCARD_HAS_VMIXER
-/* On Vmixer cards this one controls the line-out volume */
-static struct snd_kcontrol_new snd_echo_line_output_gain __devinitdata = {
-       .name = "Line Playback Volume",
-       .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-       .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
-       .info = snd_echo_output_gain_info,
-       .get = snd_echo_output_gain_get,
-       .put = snd_echo_output_gain_put,
-       .tlv = {.p = db_scale_output_gain},
-};
-#else
 static struct snd_kcontrol_new snd_echo_pcm_output_gain __devinitdata = {
        .name = "PCM Playback Volume",
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
@@ -1022,6 +1012,7 @@ static struct snd_kcontrol_new snd_echo_pcm_output_gain __devinitdata = {
        .put = snd_echo_output_gain_put,
        .tlv = {.p = db_scale_output_gain},
 };
+
 #endif
 
 
@@ -2037,8 +2028,6 @@ static int __devinit snd_echo_probe(struct pci_dev *pci,
 
 #ifdef ECHOCARD_HAS_VMIXER
        snd_echo_vmixer.count = num_pipes_out(chip) * num_busses_out(chip);
-       if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_line_output_gain, chip))) < 0)
-               goto ctl_error;
        if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_vmixer, chip))) < 0)
                goto ctl_error;
 #else