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Hi,
I'm working on getting the usb part of this very nice control surface to
work with alsa. I sniffed the usb traffic of the windows driver then
browsed the snd-usb-audio source code for clues.
I managed to get it partially working using a modified QUIRK_MIDI_EMAGIC
since the protocols are fairly similar (at least the 0xF5 port switching
part).
Please find attached the patch I came up to.
I have a few problems and dark areas I hope you'll be able to light up a
little :
First, I more or less get the picture of what the code is doing but
there's one part I fiddled with that I don't understand fully. What are
the .out_cables and .in_cables bitmasks doing besides defining the
number of ports ?
Next, the input part seem to work flawlessly on all ports, but I have
what seems to be a buffer overflow on the device when outputting midi
data. Comparing the windows and linux usb traffic, something obvious
shows up : the windows driver seem to be waiting for the device's
acknowledgment after each sent byte before sending the next one while
the snd-usb-audio module sends a bunch of bytes at once that ends up
confusing the device _and_ module. How can I make it behave like the
windows driver ?
I have traffic and error logs available if needed.
Thanks.
- --
RaphaÃl Doursenaud
http://raphael.doursenaud.fr
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diff -Nurp linux-2.6.36-rc6/sound/usb/midi.c linux-2.6.36-rc6.patched/sound/usb/midi.c
--- linux-2.6.36-rc6/sound/usb/midi.c 2010-09-29 03:01:22.000000000 +0200
+++ linux-2.6.36-rc6.patched/sound/usb/midi.c 2010-10-18 00:16:43.146000091 +0200
@@ -59,7 +59,7 @@
/*
* define this to log all USB packets
*/
-/* #define DUMP_PACKETS */
+#define DUMP_PACKETS
/*
* how long to wait after some USB errors, so that khubd can disconnect() us
@@ -987,6 +987,108 @@ static struct usb_protocol_ops snd_usbmi
.finish_out_endpoint = snd_usbmidi_emagic_finish_out,
};
+/*
+ * Radikal USB MIDI protocol: raw MIDI with "F5 xx" port switching and "FF" padded data.
+ */
+
+static void snd_usbmidi_radikal_input(struct snd_usb_midi_in_endpoint* ep,
+ uint8_t* buffer, int buffer_length)
+{
+ int i;
+
+ /* 0xFF indicates end of valid data */
+ for (i = 0; i < buffer_length; ++i)
+ if (buffer[i] == 0xff) {
+ buffer_length = i;
+ break;
+ }
+
+ /* handle 0xF5 at end of last buffer */
+ if (ep->seen_f5)
+ goto switch_port;
+
+ while (buffer_length > 0) {
+ /* determine size of data until next 0xF5 */
+ for (i = 0; i < buffer_length; ++i)
+ if (buffer[i] == 0xf5)
+ break;
+ snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
+ buffer += i;
+ buffer_length -= i;
+
+ if (buffer_length <= 0)
+ break;
+ ep->seen_f5 = 1;
+ ++buffer;
+ --buffer_length;
+
+ switch_port:
+ if (buffer_length <= 0)
+ break;
+ if (buffer[0] < 0x80) {
+ ep->current_port = (buffer[0] - 1) & 15;
+ ++buffer;
+ --buffer_length;
+ }
+ ep->seen_f5 = 0;
+ }
+}
+
+static void snd_usbmidi_radikal_output(struct snd_usb_midi_out_endpoint* ep,
+ struct urb *urb)
+{
+ int port0 = ep->current_port;
+ uint8_t* buf = urb->transfer_buffer;
+ int buf_free = ep->max_transfer;
+ int length, i;
+
+ for (i = 0; i < 0x10; ++i) {
+ /* round-robin, starting at the last current port */
+ int portnum = (port0 + i) & 15;
+ struct usbmidi_out_port* port = &ep->ports[portnum];
+
+ if (!port->active)
+ continue;
+ if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
+ port->active = 0;
+ continue;
+ }
+
+ if (portnum != ep->current_port) {
+ if (buf_free < 2)
+ break;
+ ep->current_port = portnum;
+ buf[0] = 0xf5;
+ buf[1] = (portnum + 1) & 15;
+ buf += 2;
+ buf_free -= 2;
+ }
+
+ if (buf_free < 1)
+ break;
+ length = snd_rawmidi_transmit(port->substream, buf, buf_free);
+ if (length > 0) {
+ buf += length;
+ buf_free -= length;
+ if (buf_free < 1)
+ break;
+ }
+ }
+
+ /* pad remaining bytes with 0xFF */
+ while (buf_free < ep->max_transfer && buf_free > 0) {
+ *buf = 0xff;
+ ++buf;
+ --buf_free;
+ }
+ urb->transfer_buffer_length = ep->max_transfer - buf_free;
+}
+
+static struct usb_protocol_ops snd_usbmidi_radikal_ops = {
+ .input = snd_usbmidi_radikal_input,
+ .output = snd_usbmidi_radikal_output,
+};
+
static void update_roland_altsetting(struct snd_usb_midi* umidi)
{
@@ -1533,6 +1635,13 @@ static struct port_info {
EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
+ /* Radikal Technologies */
+ CONTROL_PORT(0x0a35, 0x002a, 0, "%s Control"),
+ EXTERNAL_PORT(0x0a35, 0x002a, 1, "%s MIDI"),
+ CONTROL_PORT(0x0a35, 0x002a, 2, "%s Instrument 3"),
+ CONTROL_PORT(0x0a35, 0x002a, 3, "%s Instrument 4"),
+ CONTROL_PORT(0x0a35, 0x002a, 4, "%s Instrument 5"),
+ CONTROL_PORT(0x0a35, 0x002a, 5, "%s Config"),
/* Akai MPD16 */
CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
@@ -2134,6 +2243,12 @@ int snd_usbmidi_create(struct snd_card *
memcpy(&endpoints[0], quirk->data,
sizeof(struct snd_usb_midi_endpoint_info));
err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
+ break;
+ case QUIRK_MIDI_RADIKAL:
+ umidi->usb_protocol_ops = &snd_usbmidi_radikal_ops;
+ memcpy(&endpoints[0], quirk->data,
+ sizeof(struct snd_usb_midi_endpoint_info));
+ err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
break;
case QUIRK_MIDI_CME:
umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
diff -Nurp linux-2.6.36-rc6/sound/usb/midi.h linux-2.6.36-rc6.patched/sound/usb/midi.h
--- linux-2.6.36-rc6/sound/usb/midi.h 2010-09-29 03:01:22.000000000 +0200
+++ linux-2.6.36-rc6.patched/sound/usb/midi.h 2010-10-17 03:54:25.066000034 +0200
@@ -35,6 +35,9 @@ struct snd_usb_midi_endpoint_info {
/* for QUIRK_MIDI_EMAGIC, data points to a snd_usb_midi_endpoint_info
* structure (out_cables and in_cables only) */
+/* for QUIRK_MIDI_RADIKAL, data points to a snd_usb_midi_endpoint_info
+ * structure (out_cables and in_cables only) */
+
/* for QUIRK_MIDI_CME, data is NULL */
/* for QUIRK_MIDI_AKAI, data is NULL */
diff -Nurp linux-2.6.36-rc6/sound/usb/quirks-table.h linux-2.6.36-rc6.patched/sound/usb/quirks-table.h
--- linux-2.6.36-rc6/sound/usb/quirks-table.h 2010-09-29 03:01:22.000000000 +0200
+++ linux-2.6.36-rc6.patched/sound/usb/quirks-table.h 2010-10-17 04:39:49.509000034 +0200
@@ -1972,6 +1972,37 @@ YAMAHA_DEVICE(0x7010, "UB99"),
}
}
},
+/* Radikal Technologies devices */
+{
+ USB_DEVICE(0x0a35, 0x002a),
+ .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+ .vendor_name = "Radikal Technologies",
+ .product_name = "SAC-2K",
+ .ifnum = QUIRK_ANY_INTERFACE,
+ .type = QUIRK_COMPOSITE,
+ .data = (const struct snd_usb_audio_quirk[]) {
+ {
+ .ifnum = 0,
+ .type = QUIRK_IGNORE_INTERFACE
+ },
+ {
+ .ifnum = 1,
+ .type = QUIRK_IGNORE_INTERFACE
+ },
+ {
+ .ifnum = 2,
+ .type = QUIRK_MIDI_RADIKAL,
+ .data = & (const struct snd_usb_midi_endpoint_info) {
+ .out_cables = 0x801f,
+ .in_cables = 0x801f
+ }
+ },
+ {
+ .ifnum = -1
+ }
+ }
+ }
+},
/* AKAI devices */
{
diff -Nurp linux-2.6.36-rc6/sound/usb/quirks.c linux-2.6.36-rc6.patched/sound/usb/quirks.c
--- linux-2.6.36-rc6/sound/usb/quirks.c 2010-09-29 03:01:22.000000000 +0200
+++ linux-2.6.36-rc6.patched/sound/usb/quirks.c 2010-10-17 03:54:28.202000034 +0200
@@ -289,6 +289,7 @@ int snd_usb_create_quirk(struct snd_usb_
[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
[QUIRK_MIDI_FASTLANE] = create_any_midi_quirk,
[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
+ [QUIRK_MIDI_RADIKAL] = create_any_midi_quirk,
[QUIRK_MIDI_CME] = create_any_midi_quirk,
[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
diff -Nurp linux-2.6.36-rc6/sound/usb/usbaudio.h linux-2.6.36-rc6.patched/sound/usb/usbaudio.h
--- linux-2.6.36-rc6/sound/usb/usbaudio.h 2010-09-29 03:01:22.000000000 +0200
+++ linux-2.6.36-rc6.patched/sound/usb/usbaudio.h 2010-10-17 03:54:37.210000034 +0200
@@ -72,6 +72,7 @@ enum quirk_type {
QUIRK_MIDI_NOVATION,
QUIRK_MIDI_FASTLANE,
QUIRK_MIDI_EMAGIC,
+ QUIRK_MIDI_RADIKAL,
QUIRK_MIDI_CME,
QUIRK_MIDI_AKAI,
QUIRK_MIDI_US122L,
begin:vcard
fn;quoted-printable:Rapha=C3=ABl Doursenaud
n;quoted-printable:Doursenaud;Rapha=C3=ABl
email;internet:raphael@xxxxxxxxxxxxx
url:http://raphael.doursenaud.fr
version:2.1
end:vcard
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