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sb8_midi.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *  Routines for control of SoundBlaster cards - MIDI interface
 *
 *   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.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * --
 *
 * Sun May  9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
 *   Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from 
 *   working.
 *
 * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
 *   Added full duplex UART mode for DSP version 2.0 and later.
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/sb.h>


irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
{
      struct snd_rawmidi *rmidi;
      int max = 64;
      char byte;

      if (!chip)
            return IRQ_NONE;
      
      rmidi = chip->rmidi;
      if (!rmidi) {
            inb(SBP(chip, DATA_AVAIL));   /* ack interrupt */
            return IRQ_NONE;
      }

      spin_lock(&chip->midi_input_lock);
      while (max-- > 0) {
            if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
                  byte = inb(SBP(chip, READ));
                  if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
                        snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
                  }
            }
      }
      spin_unlock(&chip->midi_input_lock);
      return IRQ_HANDLED;
}

static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_sb *chip;
      unsigned int valid_open_flags;

      chip = substream->rmidi->private_data;
      valid_open_flags = chip->hardware >= SB_HW_20
            ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
      spin_lock_irqsave(&chip->open_lock, flags);
      if (chip->open & ~valid_open_flags) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            return -EAGAIN;
      }
      chip->open |= SB_OPEN_MIDI_INPUT;
      chip->midi_substream_input = substream;
      if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            snd_sbdsp_reset(chip);        /* reset DSP */
            if (chip->hardware >= SB_HW_20)
                  snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
      } else {
            spin_unlock_irqrestore(&chip->open_lock, flags);
      }
      return 0;
}

static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_sb *chip;
      unsigned int valid_open_flags;

      chip = substream->rmidi->private_data;
      valid_open_flags = chip->hardware >= SB_HW_20
            ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
      spin_lock_irqsave(&chip->open_lock, flags);
      if (chip->open & ~valid_open_flags) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            return -EAGAIN;
      }
      chip->open |= SB_OPEN_MIDI_OUTPUT;
      chip->midi_substream_output = substream;
      if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            snd_sbdsp_reset(chip);        /* reset DSP */
            if (chip->hardware >= SB_HW_20)
                  snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
      } else {
            spin_unlock_irqrestore(&chip->open_lock, flags);
      }
      return 0;
}

static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_sb *chip;

      chip = substream->rmidi->private_data;
      spin_lock_irqsave(&chip->open_lock, flags);
      chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
      chip->midi_substream_input = NULL;
      if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            snd_sbdsp_reset(chip);        /* reset DSP */
      } else {
            spin_unlock_irqrestore(&chip->open_lock, flags);
      }
      return 0;
}

static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_sb *chip;

      chip = substream->rmidi->private_data;
      spin_lock_irqsave(&chip->open_lock, flags);
      chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
      chip->midi_substream_output = NULL;
      if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
            spin_unlock_irqrestore(&chip->open_lock, flags);
            snd_sbdsp_reset(chip);        /* reset DSP */
      } else {
            spin_unlock_irqrestore(&chip->open_lock, flags);
      }
      return 0;
}

static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
      unsigned long flags;
      struct snd_sb *chip;

      chip = substream->rmidi->private_data;
      spin_lock_irqsave(&chip->open_lock, flags);
      if (up) {
            if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
                  if (chip->hardware < SB_HW_20)
                        snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
                  chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
            }
      } else {
            if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
                  if (chip->hardware < SB_HW_20)
                        snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
                  chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
            }
      }
      spin_unlock_irqrestore(&chip->open_lock, flags);
}

static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_sb *chip;
      char byte;
      int max = 32;

      /* how big is Tx FIFO? */
      chip = substream->rmidi->private_data;
      while (max-- > 0) {
            spin_lock_irqsave(&chip->open_lock, flags);
            if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
                  chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
                  del_timer(&chip->midi_timer);
                  spin_unlock_irqrestore(&chip->open_lock, flags);
                  break;
            }
            if (chip->hardware >= SB_HW_20) {
                  int timeout = 8;
                  while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
                        ;
                  if (timeout == 0) {
                        /* Tx FIFO full - try again later */
                        spin_unlock_irqrestore(&chip->open_lock, flags);
                        break;
                  }
                  outb(byte, SBP(chip, WRITE));
            } else {
                  snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
                  snd_sbdsp_command(chip, byte);
            }
            snd_rawmidi_transmit_ack(substream, 1);
            spin_unlock_irqrestore(&chip->open_lock, flags);
      }
}

static void snd_sb8dsp_midi_output_timer(unsigned long data)
{
      struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;
      struct snd_sb * chip = substream->rmidi->private_data;
      unsigned long flags;

      spin_lock_irqsave(&chip->open_lock, flags);
      chip->midi_timer.expires = 1 + jiffies;
      add_timer(&chip->midi_timer);
      spin_unlock_irqrestore(&chip->open_lock, flags);      
      snd_sb8dsp_midi_output_write(substream);
}

static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
      unsigned long flags;
      struct snd_sb *chip;

      chip = substream->rmidi->private_data;
      spin_lock_irqsave(&chip->open_lock, flags);
      if (up) {
            if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
                  init_timer(&chip->midi_timer);
                  chip->midi_timer.function = snd_sb8dsp_midi_output_timer;
                  chip->midi_timer.data = (unsigned long) substream;
                  chip->midi_timer.expires = 1 + jiffies;
                  add_timer(&chip->midi_timer);
                  chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
            }
      } else {
            if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
                  chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
            }
      }
      spin_unlock_irqrestore(&chip->open_lock, flags);

      if (up)
            snd_sb8dsp_midi_output_write(substream);
}

static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
{
      .open =           snd_sb8dsp_midi_output_open,
      .close =    snd_sb8dsp_midi_output_close,
      .trigger =  snd_sb8dsp_midi_output_trigger,
};

static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
{
      .open =           snd_sb8dsp_midi_input_open,
      .close =    snd_sb8dsp_midi_input_close,
      .trigger =  snd_sb8dsp_midi_input_trigger,
};

int snd_sb8dsp_midi(struct snd_sb *chip, int device, struct snd_rawmidi ** rrawmidi)
{
      struct snd_rawmidi *rmidi;
      int err;

      if (rrawmidi)
            *rrawmidi = NULL;
      if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
            return err;
      strcpy(rmidi->name, "SB8 MIDI");
      snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
      snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
      rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
      if (chip->hardware >= SB_HW_20)
            rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
      rmidi->private_data = chip;
      chip->rmidi = rmidi;
      if (rrawmidi)
            *rrawmidi = rmidi;
      return 0;
}

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