[PATCH 3.19.y-ckt 100/130] ALSA: usb-audio: add dB range mapping for some devices

From: Kamal Mostafa
Date: Thu Aug 27 2015 - 18:24:05 EST


3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Yao-Wen Mao <yaowen@xxxxxxxxxx>

commit 2d1cb7f658fb9c3ba8f9dab8aca297d4dfdec835 upstream.

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

Signed-off-by: Yao-Wen Mao <yaowen@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
sound/usb/mixer_maps.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index e5000da..6a803ef 100644
--- 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 */
};

--
1.9.1

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