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 --- 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 cc2dd1f0decb..32af6b741ef5 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 0df9ede99dfd..ede753685491 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -660,6 +660,18 @@ 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); +} + /* * Novation Twitch DJ controller */ @@ -986,6 +998,8 @@ 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;