From: Jiri Jaburek <jjaburek@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit d70a1b9893f820fdbcdffac408c909c50f2e6b43 upstream.
The Arcam rPAC seems to have the same problem - whenever anything
(alsamixer, udevd, 3.9+ kernel from 60af3d037eb8c, ..) attempts to
access mixer / control interface of the card, the firmware "locks up"
the entire device, resulting in
SNDRV_PCM_IOCTL_HW_PARAMS failed (-5): Input/output error
from alsa-lib.
Other operating systems can somehow read the mixer (there seems to be
playback volume/mute), but any manipulation is ignored by the device
(which has hardware volume controls).
Signed-off-by: Jiri Jaburek <jjaburek@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
sound/usb/mixer_maps.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index 0339d464791a..4df31b0f94a3 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -322,8 +322,11 @@ static struct usbmix_name_map hercules_usb51_map[] = {
{ 0 } /* terminator */
};
-static const struct usbmix_name_map kef_x300a_map[] = {
- { 10, NULL }, /* firmware locks up (?) when we try to access this FU */
+/* some (all?) SCMS USB3318 devices are affected by a firmware lock up
+ * when anything attempts to access FU 10 (control)
+ */
+static const struct usbmix_name_map scms_usb3318_map[] = {
+ { 10, NULL },
{ 0 }
};
@@ -415,8 +418,14 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
.map = ebox44_map,
},
{
+ /* KEF X300A */
.id = USB_ID(0x27ac, 0x1000),
- .map = kef_x300a_map,
+ .map = scms_usb3318_map,
+ },
+ {
+ /* Arcam rPAC */
+ .id = USB_ID(0x25c4, 0x0003),
+ .map = scms_usb3318_map,
},
{ 0 } /* terminator */
};
--
2.2.1
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