[alsa-devel] [PATCH 1/1] ALSA: usb-audio: add support for Akai MPD16
Krzysztof Foltman
wdev at foltman.com
Wed May 19 22:06:19 CEST 2010
The decoding/encoding is based on own reverse-engineering. Both control and
data ports are handled. Writing to control port supports SysEx events only,
as this is the only type of messages that MPD16 recognizes.
Signed-off-by: Krzysztof Foltman <wdev at foltman.com>
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 2c1558c..d669feb 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -434,7 +434,7 @@ static void snd_usbmidi_maudio_broken_running_status_input(
u8 cin = buffer[i] & 0x0f;
struct usbmidi_in_port *port = &ep->ports[cable];
int length;
-
+
length = snd_usbmidi_cin_length[cin];
if (cin == 0xf && buffer[i + 1] >= 0xf8)
; /* realtime msg: no running status change */
@@ -628,13 +628,13 @@ static struct usb_protocol_ops snd_usbmidi_standard_ops = {
static struct usb_protocol_ops snd_usbmidi_midiman_ops = {
.input = snd_usbmidi_midiman_input,
- .output = snd_usbmidi_standard_output,
+ .output = snd_usbmidi_standard_output,
.output_packet = snd_usbmidi_output_midiman_packet,
};
static struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
.input = snd_usbmidi_maudio_broken_running_status_input,
- .output = snd_usbmidi_standard_output,
+ .output = snd_usbmidi_standard_output,
.output_packet = snd_usbmidi_output_standard_packet,
};
@@ -645,6 +645,110 @@ static struct usb_protocol_ops snd_usbmidi_cme_ops = {
};
/*
+ * AKAI MPD16 protocol:
+ *
+ * For control port (endpoint 1):
+ * ==============================
+ * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
+ * SysEx message (msg_len=9 bytes long):
+ *
+ * F0 47 62 60 aa bb cc xx F7 (xx = (aa + bb + cc) & 0x7F)
+ *
+ * aa bb cc
+ * --------
+ * 10 01 7E edit mode on?
+ * 10 01 00 edit mode off?
+ * 10 04 7F select bank 1
+ * 10 04 00 select bank 0
+ * 11 pp nn set pad pp to send note nn
+ * 12 pp ss set sensitivity on pad pp to ss
+ * 13 00 cc set slider CC number to cc
+ * 14 00 cc set MIDI channel to cc
+ * 15 01 pp request note number for pad pp (returns 20 pp nn)
+ * 15 02 pp request sensitivity for pad pp (returns 21 pp ss)
+ * 15 03 00 request slider CC number (returns 22 00 cc)
+ * 15 05 00 request MIDI channel number (returns 23 00 cc)
+ *
+ * For data port (endpoint 2):
+ * ===========================
+ * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
+ * MIDI message (msg_len bytes long)
+ *
+ * Messages sent:
+ * 21 FE (active sense)
+ * 23 90 xx xx (note on)
+ * 23 Ax xx xx (polyphonic pressure)
+ * 23 Bx xx xx (control change)
+ */
+static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
+ uint8_t *buffer, int buffer_length)
+{
+ unsigned int pos = 0;
+ unsigned int len = (unsigned int)buffer_length;
+ while (pos < len) {
+ int port = (buffer[pos] >> 4) - 1;
+ unsigned int msg_len = buffer[pos] & 0x0f;
+ pos++;
+ if (pos + msg_len <= len && (port == 0 || port == 1))
+ snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
+ pos += msg_len;
+ }
+}
+
+static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
+ struct urb *urb)
+{
+ uint8_t *msg;
+ uint8_t *plen = &ep->ports[0].data[0]; /* length so far */
+ int count;
+ uint8_t tmp;
+
+ if (!ep->ports[0].active)
+ return;
+
+ msg = urb->transfer_buffer + urb->transfer_buffer_length;
+
+ /* only try adding more data when there's space for at least 1 SysEx */
+ while (urb->transfer_buffer_length + 16 < ep->max_transfer) {
+ count = snd_rawmidi_transmit(ep->ports[0].substream, &tmp, 1);
+ if (count < 1) {
+ ep->ports[0].active = 0;
+ return;
+ }
+ if (ep->ports[0].state == STATE_UNKNOWN) {
+ /* only accept SysEx'es, skip everything else */
+ if (tmp != 0xF0)
+ continue;
+ /* start accumulating SysEx data */
+ *plen = 0x00;
+ ep->ports[0].state = STATE_SYSEX_0;
+ }
+ if (*plen > 14) {
+ /* SysEx too long, drop it and start over */
+ ep->ports[0].state = STATE_UNKNOWN;
+ continue;
+ }
+ msg[++(*plen)] = tmp;
+ if (tmp == 0xF7) {
+ /* add total size (w/hdr) to length-to-transfer */
+ urb->transfer_buffer_length += 1 + *plen;
+ /* set port number nibble in the header */
+ msg[0] = 0x10 | *plen;
+ msg += 1 + *plen;
+
+ /* go back to waiting for SysEx */
+ ep->ports[0].state = STATE_UNKNOWN;
+ continue;
+ }
+ }
+}
+
+static struct usb_protocol_ops snd_usbmidi_akai_ops = {
+ .input = snd_usbmidi_akai_input,
+ .output = snd_usbmidi_akai_output,
+};
+
+/*
* Novation USB MIDI protocol: number of data bytes is in the first byte
* (when receiving) (+1!) or in the second byte (when sending); data begins
* at the third byte.
@@ -1434,6 +1538,9 @@ 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"),
+ /* Akai MPD16 */
+ CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
+ EXTERNAL_PORT(0x09e8, 0x0062, 1, "%s MIDI"),
/* Access Music Virus TI */
EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
@@ -1707,7 +1814,7 @@ static int snd_usbmidi_detect_endpoints(struct snd_usb_midi* umidi,
snd_usbmidi_switch_roland_altsetting(umidi);
if (endpoint[0].out_ep || endpoint[0].in_ep)
- return 0;
+ return 0;
intf = umidi->iface;
if (!intf || intf->num_altsetting < 1)
@@ -1745,7 +1852,7 @@ static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi* umidi,
struct snd_usb_midi_endpoint_info* endpoints)
{
int err, i;
-
+
err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
if (endpoints[i].out_ep)
@@ -2035,6 +2142,12 @@ int snd_usbmidi_create(struct snd_card *card,
umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
break;
+ case QUIRK_MIDI_AKAI:
+ umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
+ err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
+ /* endpoint 1 is input-only */
+ endpoints[1].out_cables = 0;
+ break;
default:
snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
err = -ENXIO;
diff --git a/sound/usb/midi.h b/sound/usb/midi.h
index 2089ec9..2fca80b 100644
--- a/sound/usb/midi.h
+++ b/sound/usb/midi.h
@@ -37,6 +37,8 @@ struct snd_usb_midi_endpoint_info {
/* for QUIRK_MIDI_CME, data is NULL */
+/* for QUIRK_MIDI_AKAI, data is NULL */
+
int snd_usbmidi_create(struct snd_card *card,
struct usb_interface *iface,
struct list_head *midi_list,
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 91ddef3..f8797f6 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -1973,6 +1973,17 @@ YAMAHA_DEVICE(0x7010, "UB99"),
}
},
+/* AKAI devices */
+{
+ USB_DEVICE(0x09e8, 0x0062),
+ .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+ .vendor_name = "AKAI",
+ .product_name = "MPD16",
+ .ifnum = 0,
+ .type = QUIRK_MIDI_AKAI,
+ }
+},
+
/* TerraTec devices */
{
USB_DEVICE_VENDOR_SPEC(0x0ccd, 0x0012),
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 136e5b4..b45e54c 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -289,6 +289,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
[QUIRK_MIDI_FASTLANE] = create_any_midi_quirk,
[QUIRK_MIDI_EMAGIC] = 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,
[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index d679e72..06ebf24 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -74,6 +74,7 @@ enum quirk_type {
QUIRK_MIDI_FASTLANE,
QUIRK_MIDI_EMAGIC,
QUIRK_MIDI_CME,
+ QUIRK_MIDI_AKAI,
QUIRK_MIDI_US122L,
QUIRK_AUDIO_STANDARD_INTERFACE,
QUIRK_AUDIO_FIXED_ENDPOINT,
--
1.7.0.4
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