ALSA: usb-audio: add dB range mapping for some devices

Add the correct dB ranges of Bose Companion 5 and Drangonfly DAC 1.2.

Signed-off-by: Yao-Wen Mao <yaowen@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index e5000da9e9d7093f6e287194665de2d63f046e93..6a803eff87f71110049d9c39cb07025d2c64d828 100644 (file)
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -341,6 +341,20 @@ static const struct usbmix_name_map scms_usb3318_map[] = {
        { 0 }
 };
 
+/* Bose companion 5, the dB conversion factor is 16 instead of 256 */
+static struct usbmix_dB_map bose_companion5_dB = {-5006, -6};
+static struct usbmix_name_map bose_companion5_map[] = {
+       { 3, NULL, .dB = &bose_companion5_dB },
+       { 0 }   /* terminator */
+};
+
+/* Dragonfly DAC 1.2, the dB conversion factor is 1 instead of 256 */
+static struct usbmix_dB_map dragonfly_1_2_dB = {0, 5000};
+static struct usbmix_name_map dragonfly_1_2_map[] = {
+       { 7, NULL, .dB = &dragonfly_1_2_dB },
+       { 0 }   /* terminator */
+};
+
 /*
  * Control map entries
  */
@@ -451,6 +465,16 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
                .id = USB_ID(0x25c4, 0x0003),
                .map = scms_usb3318_map,
        },
+       {
+               /* Bose Companion 5 */
+               .id = USB_ID(0x05a7, 0x1020),
+               .map = bose_companion5_map,
+       },
+       {
+               /* Dragonfly DAC 1.2 */
+               .id = USB_ID(0x21b4, 0x0081),
+               .map = dragonfly_1_2_map,
+       },
        { 0 } /* terminator */
 };