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@@ -1831,6 +1831,7 @@ void snd_usb_mixer_rc_memory_change(struct usb_mixer_interface *mixer,
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}
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static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
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+ struct usb_mixer_elem_info *cval,
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struct snd_kcontrol *kctl)
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{
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/* Approximation using 10 ranges based on output measurement on hw v1.2.
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@@ -1848,10 +1849,19 @@ static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer,
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41, 50, TLV_DB_MINMAX_ITEM(-441, 0),
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);
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- usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk\n");
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- kctl->tlv.p = scale;
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- kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
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- kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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+ if (cval->min == 0 && cval->max == 50) {
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+ usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk (0-50 variant)\n");
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+ kctl->tlv.p = scale;
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+ kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
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+ kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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+
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+ } else if (cval->min == 0 && cval->max <= 1000) {
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+ /* Some other clearly broken DragonFly variant.
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+ * At least a 0..53 variant (hw v1.0) exists.
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+ */
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+ usb_audio_info(mixer->chip, "ignoring too narrow dB range on a DragonFly device");
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+ kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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+ }
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}
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void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
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@@ -1860,8 +1870,8 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
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{
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switch (mixer->chip->usb_id) {
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case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
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- if (unitid == 7 && cval->min == 0 && cval->max == 50)
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- snd_dragonfly_quirk_db_scale(mixer, kctl);
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+ if (unitid == 7 && cval->control == UAC_FU_VOLUME)
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+ snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
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break;
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}
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}
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