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