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midi.c

/*
 * 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;
}

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