ALSA: usb-audio - Don't expose broken dB ranges
Some crappy USB-audio devices give broken dB ranges, e.g. both min and max are 0dB. This confuses the volume control that prefers dB expression such as alsactl or PulseAudio. In such a case, it's much better not to expose the broken dB information. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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13eb4ab8ca
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59bb7f0eeb
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@ -1097,11 +1097,13 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
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append_ctl_name(kctl, control == UAC_FU_MUTE ?
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" Switch" : " Volume");
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if (control == UAC_FU_VOLUME) {
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kctl->tlv.c = mixer_vol_tlv;
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kctl->vd[0].access |=
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SNDRV_CTL_ELEM_ACCESS_TLV_READ |
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SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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check_mapped_dB(map, cval);
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if (cval->dBmin < cval->dBmax) {
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kctl->tlv.c = mixer_vol_tlv;
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kctl->vd[0].access |=
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SNDRV_CTL_ELEM_ACCESS_TLV_READ |
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SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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}
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}
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break;
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