1 files changed, 203 insertions, 0 deletions

diff --git a/sound/usb/6fire/midi.c b/sound/usb/6fire/midi.c
new file mode 100644
index 000000000000..13f4509dce2b
--- /dev/null
+++ b/sound/usb/6fire/midi.c
@@ -0,0 +1,203 @@
+/*
+ * Linux driver for TerraTec DMX 6Fire USB
+ *
+ * Rawmidi driver
+ *
+ * Author:      Torsten Schenk <torsten.schenk@zoho.com>
+ * Created:     Jan 01, 2011
+ * Version:     0.3.0
+ * Copyright:   (C) Torsten Schenk
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <sound/rawmidi.h>
+
+#include "midi.h"
+#include "chip.h"
+#include "comm.h"
+
+static void usb6fire_midi_out_handler(struct urb *urb)
+{
+        struct midi_runtime *rt = urb->context;
+        int ret;
+        unsigned long flags;
+
+        spin_lock_irqsave(&rt->out_lock, flags);
+
+        if (rt->out) {
+                ret = snd_rawmidi_transmit(rt->out, rt->out_buffer + 4,
+                                MIDI_BUFSIZE - 4);
+                if (ret > 0) { /* more data available, send next packet */
+                        rt->out_buffer[1] = ret + 2;
+                        rt->out_buffer[3] = rt->out_serial++;
+                        urb->transfer_buffer_length = ret + 4;
+
+                        ret = usb_submit_urb(urb, GFP_ATOMIC);
+                        if (ret < 0)
+                                snd_printk(KERN_ERR PREFIX "midi out urb "
+                                                "submit failed: %d\n", ret);
+                } else /* no more data to transmit */
+                        rt->out = NULL;
+        }
+        spin_unlock_irqrestore(&rt->out_lock, flags);
+}
+
+static void usb6fire_midi_in_received(
+                struct midi_runtime *rt, u8 *data, int length)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&rt->in_lock, flags);
+        if (rt->in)
+                snd_rawmidi_receive(rt->in, data, length);
+        spin_unlock_irqrestore(&rt->in_lock, flags);
+}
+
+static int usb6fire_midi_out_open(struct snd_rawmidi_substream *alsa_sub)
+{
+        return 0;
+}
+
+static int usb6fire_midi_out_close(struct snd_rawmidi_substream *alsa_sub)
+{
+        return 0;
+}
+
+static void usb6fire_midi_out_trigger(
+                struct snd_rawmidi_substream *alsa_sub, int up)
+{
+        struct midi_runtime *rt = alsa_sub->rmidi->private_data;
+        struct urb *urb = &rt->out_urb;
+        __s8 ret;
+        unsigned long flags;
+
+        spin_lock_irqsave(&rt->out_lock, flags);
+        if (up) { /* start transfer */
+                if (rt->out) { /* we are already transmitting so just return */
+                        spin_unlock_irqrestore(&rt->out_lock, flags);
+                        return;
+                }
+
+                ret = snd_rawmidi_transmit(alsa_sub, rt->out_buffer + 4,
+                                MIDI_BUFSIZE - 4);
+                if (ret > 0) {
+                        rt->out_buffer[1] = ret + 2;
+                        rt->out_buffer[3] = rt->out_serial++;
+                        urb->transfer_buffer_length = ret + 4;
+
+                        ret = usb_submit_urb(urb, GFP_ATOMIC);
+                        if (ret < 0)
+                                snd_printk(KERN_ERR PREFIX "midi out urb "
+                                                "submit failed: %d\n", ret);
+                        else
+                                rt->out = alsa_sub;
+                }
+        } else if (rt->out == alsa_sub)
+                rt->out = NULL;
+        spin_unlock_irqrestore(&rt->out_lock, flags);
+}
+
+static void usb6fire_midi_out_drain(struct snd_rawmidi_substream *alsa_sub)
+{
+        struct midi_runtime *rt = alsa_sub->rmidi->private_data;
+        int retry = 0;
+
+        while (rt->out && retry++ < 100)
+                msleep(10);
+}
+
+static int usb6fire_midi_in_open(struct snd_rawmidi_substream *alsa_sub)
+{
+        return 0;
+}
+
+static int usb6fire_midi_in_close(struct snd_rawmidi_substream *alsa_sub)
+{
+        return 0;
+}
+
+static void usb6fire_midi_in_trigger(
+                struct snd_rawmidi_substream *alsa_sub, int up)
+{
+        struct midi_runtime *rt = alsa_sub->rmidi->private_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&rt->in_lock, flags);
+        if (up)
+                rt->in = alsa_sub;
+        else
+                rt->in = NULL;
+        spin_unlock_irqrestore(&rt->in_lock, flags);
+}
+
+static struct snd_rawmidi_ops out_ops = {
+        .open = usb6fire_midi_out_open,
+        .close = usb6fire_midi_out_close,
+        .trigger = usb6fire_midi_out_trigger,
+        .drain = usb6fire_midi_out_drain
+};
+
+static struct snd_rawmidi_ops in_ops = {
+        .open = usb6fire_midi_in_open,
+        .close = usb6fire_midi_in_close,
+        .trigger = usb6fire_midi_in_trigger
+};
+
+int __devinit usb6fire_midi_init(struct sfire_chip *chip)
+{
+        int ret;
+        struct midi_runtime *rt = kzalloc(sizeof(struct midi_runtime),
+                        GFP_KERNEL);
+        struct comm_runtime *comm_rt = chip->comm;
+
+        if (!rt)
+                return -ENOMEM;
+
+        rt->chip = chip;
+        rt->in_received = usb6fire_midi_in_received;
+        rt->out_buffer[0] = 0x80; /* 'send midi' command */
+        rt->out_buffer[1] = 0x00; /* size of data */
+        rt->out_buffer[2] = 0x00; /* always 0 */
+        spin_lock_init(&rt->in_lock);
+        spin_lock_init(&rt->out_lock);
+
+        comm_rt->init_urb(comm_rt, &rt->out_urb, rt->out_buffer, rt,
+                        usb6fire_midi_out_handler);
+
+        ret = snd_rawmidi_new(chip->card, "6FireUSB", 0, 1, 1, &rt->instance);
+        if (ret < 0) {
+                kfree(rt);
+                snd_printk(KERN_ERR PREFIX "unable to create midi.\n");
+                return ret;
+        }
+        rt->instance->private_data = rt;
+        strcpy(rt->instance->name, "DMX6FireUSB MIDI");
+        rt->instance->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
+                        SNDRV_RAWMIDI_INFO_INPUT |
+                        SNDRV_RAWMIDI_INFO_DUPLEX;
+        snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_OUTPUT,
+                        &out_ops);
+        snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_INPUT,
+                        &in_ops);
+
+        chip->midi = rt;
+        return 0;
+}
+
+void usb6fire_midi_abort(struct sfire_chip *chip)
+{
+        struct midi_runtime *rt = chip->midi;
+
+        if (rt)
+                usb_poison_urb(&rt->out_urb);
+}
+
+void usb6fire_midi_destroy(struct sfire_chip *chip)
+{
+        kfree(chip->midi);
+        chip->midi = NULL;
+}