@@ -2377,6 +2377,9 @@ int snd_usbmidi_create(struct snd_card *card,
err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
break;
+ case QUIRK_MIDI_CH345:
+ err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
+ break;
default:
dev_err(&umidi->dev->dev, "invalid quirk type %d\n",
quirk->type);
@@ -2824,6 +2824,17 @@ YAMAHA_DEVICE(0x7010, "UB99"),
.idProduct = 0x1020,
},
+/* QinHeng devices */
+{
+ USB_DEVICE(0x1a86, 0x752d),
+ .driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+ .vendor_name = "QinHeng",
+ .product_name = "CH345",
+ .ifnum = 1,
+ .type = QUIRK_MIDI_CH345
+ }
+},
+
/* KeithMcMillen Stringport */
{
USB_DEVICE(0x1f38, 0x0001),
@@ -535,6 +535,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
[QUIRK_MIDI_CME] = create_any_midi_quirk,
[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
[QUIRK_MIDI_FTDI] = create_any_midi_quirk,
+ [QUIRK_MIDI_CH345] = create_any_midi_quirk,
[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
@@ -94,6 +94,7 @@ enum quirk_type {
QUIRK_MIDI_AKAI,
QUIRK_MIDI_US122L,
QUIRK_MIDI_FTDI,
+ QUIRK_MIDI_CH345,
QUIRK_AUDIO_STANDARD_INTERFACE,
QUIRK_AUDIO_FIXED_ENDPOINT,
QUIRK_AUDIO_EDIROL_UAXX,
This is a note to let you know that I have just added a patch titled ALSA: usb-audio: prevent CH345 multiport output SysEx corruption to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue This patch is scheduled to be released in version 3.19.8-ckt12. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.19.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 7d1201d669f085195e08cf4700c32309aaf81554 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch <clemens@ladisch.de> Date: Sun, 15 Nov 2015 22:38:29 +0100 Subject: ALSA: usb-audio: prevent CH345 multiport output SysEx corruption commit 1ca8b201309d842642f221db7f02f71c0af5be2d upstream. The CH345 USB MIDI chip has two output ports. However, they are multiplexed through one pin, and the number of ports cannot be reduced even for hardware that implements only one connector, so for those devices, data sent to either port ends up on the same hardware output. This becomes a problem when both ports are used at the same time, as longer MIDI commands (such as SysEx messages) are likely to be interrupted by messages from the other port, and thus to get lost. It would not be possible for the driver to detect how many ports the device actually has, except that in practice, _all_ devices built with the CH345 have only one port. So we can just ignore the device's descriptors, and hardcode one output port. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- sound/usb/midi.c | 3 +++ sound/usb/quirks-table.h | 11 +++++++++++ sound/usb/quirks.c | 1 + sound/usb/usbaudio.h | 1 + 4 files changed, 16 insertions(+) -- 1.9.1