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Subject[PATCH 3.8 29/81] ALSA: usb-audio: Add a quirk for Plantronics Gamecom 780
Date
3.8.13.20 -stable review patch.  If anyone has any objections, please let me know.

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

From: Takashi Iwai <tiwai@suse.de>

commit 19570d747795f0ecff79403698b868dc5ad7fa86 upstream.

Plantronics Gamecom 780 headset has a firmware problem, and when the
FU 0x09 volume is changed, it results in either too loud or silence
except for a very narrow range. This patch provides a workaround,
ignoring the node, initialize the volume in a sane value and keep
untouched.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=65251
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
sound/usb/mixer_maps.c | 10 ++++++++++
sound/usb/quirks.c | 14 ++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index 0e2ed3d..65e1d7a 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -322,6 +322,12 @@ static struct usbmix_name_map hercules_usb51_map[] = {
{ 0 } /* terminator */
};

+/* Plantronics Gamecom 780 has a broken volume control, better to disable it */
+static struct usbmix_name_map gamecom780_map[] = {
+ { 9, NULL }, /* FU, speaker out */
+ {}
+};
+
/*
* Control map entries
*/
@@ -358,6 +364,10 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
.id = USB_ID(0x046d, 0x09a4),
.ignore_ctl_error = 1,
},
+ { /* Plantronics GameCom 780 */
+ .id = USB_ID(0x047f, 0xc010),
+ .map = gamecom780_map,
+ },
{
/* Hercules DJ Console (Windows Edition) */
.id = USB_ID(0x06f8, 0xb000),
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index f581c3e..d138d1ef 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -445,6 +445,18 @@ static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
return err;
}

+/* quirk for Plantronics GameCom 780 with CM6302 chip */
+static int snd_usb_gamecon780_boot_quirk(struct usb_device *dev)
+{
+ /* set the initial volume and don't change; other values are either
+ * too loud or silent due to firmware bug (bko#65251)
+ */
+ u8 buf[2] = { 0x74, 0xdc };
+ return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
+ USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
+ UAC_FU_VOLUME << 8, 9 << 8, buf, 2);
+}
+
/*
* This call will put the synth in "USB send" mode, i.e it will send MIDI
* messages through USB (this is disabled at startup). The synth will
@@ -756,6 +768,8 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
return snd_usb_nativeinstruments_boot_quirk(dev);
case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro USB */
return snd_usb_fasttrackpro_boot_quirk(dev);
+ case USB_ID(0x047f, 0xc010): /* Plantronics Gamecom 780 */
+ return snd_usb_gamecon780_boot_quirk(dev);
}

return 0;
--
1.8.3.2


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