293 lines
6.8 KiB
C
293 lines
6.8 KiB
C
/*
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* Line 6 Linux USB driver
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*
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* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/rawmidi.h>
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#include "driver.h"
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#include "midi.h"
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#define line6_rawmidi_substream_midi(substream) \
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((struct snd_line6_midi *)((substream)->rmidi->private_data))
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static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
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int length);
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/*
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Pass data received via USB to MIDI.
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*/
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void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
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int length)
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{
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if (line6->line6midi->substream_receive)
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snd_rawmidi_receive(line6->line6midi->substream_receive,
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data, length);
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}
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/*
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Read data from MIDI buffer and transmit them via USB.
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*/
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static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
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{
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struct usb_line6 *line6 =
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line6_rawmidi_substream_midi(substream)->line6;
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struct snd_line6_midi *line6midi = line6->line6midi;
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struct midi_buffer *mb = &line6midi->midibuf_out;
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unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
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int req, done;
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for (;;) {
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req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
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done = snd_rawmidi_transmit_peek(substream, chunk, req);
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if (done == 0)
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break;
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line6_midibuf_write(mb, chunk, done);
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snd_rawmidi_transmit_ack(substream, done);
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}
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for (;;) {
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done = line6_midibuf_read(mb, chunk,
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LINE6_FALLBACK_MAXPACKETSIZE);
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if (done == 0)
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break;
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send_midi_async(line6, chunk, done);
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}
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}
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/*
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Notification of completion of MIDI transmission.
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*/
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static void midi_sent(struct urb *urb)
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{
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unsigned long flags;
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int status;
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int num;
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struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
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status = urb->status;
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kfree(urb->transfer_buffer);
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usb_free_urb(urb);
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if (status == -ESHUTDOWN)
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return;
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spin_lock_irqsave(&line6->line6midi->lock, flags);
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num = --line6->line6midi->num_active_send_urbs;
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if (num == 0) {
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line6_midi_transmit(line6->line6midi->substream_transmit);
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num = line6->line6midi->num_active_send_urbs;
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}
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if (num == 0)
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wake_up(&line6->line6midi->send_wait);
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spin_unlock_irqrestore(&line6->line6midi->lock, flags);
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}
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/*
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Send an asynchronous MIDI message.
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Assumes that line6->line6midi->lock is held
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(i.e., this function is serialized).
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*/
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static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
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int length)
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{
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struct urb *urb;
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int retval;
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unsigned char *transfer_buffer;
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urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (urb == NULL)
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return -ENOMEM;
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transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
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if (transfer_buffer == NULL) {
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usb_free_urb(urb);
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return -ENOMEM;
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}
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usb_fill_int_urb(urb, line6->usbdev,
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usb_sndbulkpipe(line6->usbdev,
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line6->properties->ep_ctrl_w),
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transfer_buffer, length, midi_sent, line6,
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line6->interval);
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urb->actual_length = 0;
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval < 0) {
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dev_err(line6->ifcdev, "usb_submit_urb failed\n");
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usb_free_urb(urb);
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return retval;
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}
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++line6->line6midi->num_active_send_urbs;
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return 0;
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}
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static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
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{
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return 0;
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}
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static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
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{
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return 0;
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}
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static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
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int up)
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{
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unsigned long flags;
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struct usb_line6 *line6 =
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line6_rawmidi_substream_midi(substream)->line6;
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line6->line6midi->substream_transmit = substream;
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spin_lock_irqsave(&line6->line6midi->lock, flags);
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if (line6->line6midi->num_active_send_urbs == 0)
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line6_midi_transmit(substream);
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spin_unlock_irqrestore(&line6->line6midi->lock, flags);
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}
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static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
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{
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struct usb_line6 *line6 =
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line6_rawmidi_substream_midi(substream)->line6;
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struct snd_line6_midi *midi = line6->line6midi;
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wait_event_interruptible(midi->send_wait,
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midi->num_active_send_urbs == 0);
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}
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static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
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{
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return 0;
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}
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static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
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{
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return 0;
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}
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static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
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int up)
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{
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struct usb_line6 *line6 =
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line6_rawmidi_substream_midi(substream)->line6;
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if (up)
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line6->line6midi->substream_receive = substream;
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else
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line6->line6midi->substream_receive = NULL;
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}
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static const struct snd_rawmidi_ops line6_midi_output_ops = {
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.open = line6_midi_output_open,
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.close = line6_midi_output_close,
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.trigger = line6_midi_output_trigger,
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.drain = line6_midi_output_drain,
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};
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static const struct snd_rawmidi_ops line6_midi_input_ops = {
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.open = line6_midi_input_open,
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.close = line6_midi_input_close,
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.trigger = line6_midi_input_trigger,
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};
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/* Create a MIDI device */
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static int snd_line6_new_midi(struct usb_line6 *line6,
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struct snd_rawmidi **rmidi_ret)
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{
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struct snd_rawmidi *rmidi;
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int err;
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err = snd_rawmidi_new(line6->card, "Line 6 MIDI", 0, 1, 1, rmidi_ret);
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if (err < 0)
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return err;
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rmidi = *rmidi_ret;
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strcpy(rmidi->id, line6->properties->id);
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strcpy(rmidi->name, line6->properties->name);
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rmidi->info_flags =
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SNDRV_RAWMIDI_INFO_OUTPUT |
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SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
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&line6_midi_output_ops);
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
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&line6_midi_input_ops);
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return 0;
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}
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/* MIDI device destructor */
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static void snd_line6_midi_free(struct snd_rawmidi *rmidi)
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{
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struct snd_line6_midi *line6midi = rmidi->private_data;
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line6_midibuf_destroy(&line6midi->midibuf_in);
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line6_midibuf_destroy(&line6midi->midibuf_out);
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kfree(line6midi);
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}
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/*
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Initialize the Line 6 MIDI subsystem.
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*/
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int line6_init_midi(struct usb_line6 *line6)
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{
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int err;
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struct snd_rawmidi *rmidi;
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struct snd_line6_midi *line6midi;
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if (!(line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI)) {
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/* skip MIDI initialization and report success */
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return 0;
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}
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err = snd_line6_new_midi(line6, &rmidi);
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if (err < 0)
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return err;
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line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
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if (!line6midi)
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return -ENOMEM;
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rmidi->private_data = line6midi;
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rmidi->private_free = snd_line6_midi_free;
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init_waitqueue_head(&line6midi->send_wait);
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spin_lock_init(&line6midi->lock);
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line6midi->line6 = line6;
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err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
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if (err < 0)
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return err;
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err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
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if (err < 0)
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return err;
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line6->line6midi = line6midi;
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return 0;
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}
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EXPORT_SYMBOL_GPL(line6_init_midi);
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