ALSA: Add USB US122L driver

Added a new US122L usb-audio driver.  This driver works together with a
dedicated alsa-lib plugin.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 39 insertions, 0 deletions

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 6676a177c99e..c0c7770198ad 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -669,6 +669,42 @@ static struct usb_protocol_ops snd_usbmidi_raw_ops = {
         .output = snd_usbmidi_raw_output,
 };
 
+static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
+                                     uint8_t *buffer, int buffer_length)
+{
+        if (buffer_length != 9)
+                return;
+        buffer_length = 8;
+        while (buffer_length && buffer[buffer_length - 1] == 0xFD)
+                buffer_length--;
+        if (buffer_length)
+                snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
+}
+
+static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep)
+{
+        int count;
+
+        if (!ep->ports[0].active)
+                return;
+        count = ep->urb->dev->speed == USB_SPEED_HIGH ? 1 : 2;
+        count = snd_rawmidi_transmit(ep->ports[0].substream,
+                                     ep->urb->transfer_buffer,
+                                     count);
+        if (count < 1) {
+                ep->ports[0].active = 0;
+                return;
+        }
+
+        memset(ep->urb->transfer_buffer + count, 0xFD, 9 - count);
+        ep->urb->transfer_buffer_length = count;
+}
+
+static struct usb_protocol_ops snd_usbmidi_122l_ops = {
+        .input = snd_usbmidi_us122l_input,
+        .output = snd_usbmidi_us122l_output,
+};
+
 /*
  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
  */
@@ -1714,6 +1750,9 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
                         umidi->usb_protocol_ops =
                                 &snd_usbmidi_maudio_broken_running_status_ops;
                 break;
+        case QUIRK_MIDI_US122L:
+                umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
+                /* fall through */
         case QUIRK_MIDI_FIXED_ENDPOINT:
                 memcpy(&endpoints[0], quirk->data,
                        sizeof(struct snd_usb_midi_endpoint_info));