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Sourcecode: alsa-driver version File versions

emumpu401.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of EMU10K1 MPU-401 in UART mode
 *
 *
 *   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
 *
 */

#include <linux/time.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/emu10k1.h>

#define EMU10K1_MIDI_MODE_INPUT           (1<<0)
#define EMU10K1_MIDI_MODE_OUTPUT    (1<<1)

static inline unsigned char mpu401_read(struct snd_emu10k1 *emu,
                              struct snd_emu10k1_midi *mpu, int idx)
{
      if (emu->audigy)
            return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0);
      else
            return inb(emu->port + mpu->port + idx);
}

static inline void mpu401_write(struct snd_emu10k1 *emu,
                        struct snd_emu10k1_midi *mpu, int data, int idx)
{
      if (emu->audigy)
            snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data);
      else
            outb(data, emu->port + mpu->port + idx);
}

#define mpu401_write_data(emu, mpu, data) mpu401_write(emu, mpu, data, 0)
#define mpu401_write_cmd(emu, mpu, data)  mpu401_write(emu, mpu, data, 1)
#define mpu401_read_data(emu, mpu)        mpu401_read(emu, mpu, 0)
#define mpu401_read_stat(emu, mpu)        mpu401_read(emu, mpu, 1)

#define mpu401_input_avail(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x80))
#define mpu401_output_ready(emu,mpu)      (!(mpu401_read_stat(emu,mpu) & 0x40))

#define MPU401_RESET          0xff
#define MPU401_ENTER_UART     0x3f
#define MPU401_ACK            0xfe

static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu)
{
      int timeout = 100000;
      for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--)
            mpu401_read_data(emu, mpu);
#ifdef CONFIG_SND_DEBUG
      if (timeout <= 0)
            snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", mpu401_read_stat(emu, mpu));
#endif
}

/*

 */

static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, unsigned int status)
{
      unsigned char byte;

      if (midi->rmidi == NULL) {
            snd_emu10k1_intr_disable(emu, midi->tx_enable | midi->rx_enable);
            return;
      }

      spin_lock(&midi->input_lock);
      if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) {
            if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
                  mpu401_clear_rx(emu, midi);
            } else {
                  byte = mpu401_read_data(emu, midi);
                  if (midi->substream_input)
                        snd_rawmidi_receive(midi->substream_input, &byte, 1);
            }
      }
      spin_unlock(&midi->input_lock);

      spin_lock(&midi->output_lock);
      if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) {
            if (midi->substream_output &&
                snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
                  mpu401_write_data(emu, midi, byte);
            } else {
                  snd_emu10k1_intr_disable(emu, midi->tx_enable);
            }
      }
      spin_unlock(&midi->output_lock);
}

static void snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status)
{
      do_emu10k1_midi_interrupt(emu, &emu->midi, status);
}

static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status)
{
      do_emu10k1_midi_interrupt(emu, &emu->midi2, status);
}

static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_midi *midi, unsigned char cmd, int ack)
{
      unsigned long flags;
      int timeout, ok;

      spin_lock_irqsave(&midi->input_lock, flags);
      mpu401_write_data(emu, midi, 0x00);
      /* mpu401_clear_rx(emu, midi); */

      mpu401_write_cmd(emu, midi, cmd);
      if (ack) {
            ok = 0;
            timeout = 10000;
            while (!ok && timeout-- > 0) {
                  if (mpu401_input_avail(emu, midi)) {
                        if (mpu401_read_data(emu, midi) == MPU401_ACK)
                              ok = 1;
                  }
            }
            if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK)
                  ok = 1;
      } else {
            ok = 1;
      }
      spin_unlock_irqrestore(&midi->input_lock, flags);
      if (!ok) {
            snd_printk(KERN_ERR "midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n",
                     cmd, emu->port,
                     mpu401_read_stat(emu, midi),
                     mpu401_read_data(emu, midi));
            return 1;
      }
      return 0;
}

static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      unsigned long flags;

      emu = midi->emu;
      snd_assert(emu, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT;
      midi->substream_input = substream;
      if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
                  goto error_out;
            if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
                  goto error_out;
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;

error_out:
      return -EIO;
}

static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      unsigned long flags;

      emu = midi->emu;
      snd_assert(emu, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT;
      midi->substream_output = substream;
      if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
                  goto error_out;
            if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
                  goto error_out;
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;

error_out:
      return -EIO;
}

static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      unsigned long flags;
      int err = 0;

      emu = midi->emu;
      snd_assert(emu, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      snd_emu10k1_intr_disable(emu, midi->rx_enable);
      midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT;
      midi->substream_input = NULL;
      if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return err;
}

static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      unsigned long flags;
      int err = 0;

      emu = midi->emu;
      snd_assert(emu, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      snd_emu10k1_intr_disable(emu, midi->tx_enable);
      midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT;
      midi->substream_output = NULL;
      if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return err;
}

static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      emu = midi->emu;
      snd_assert(emu, return);

      if (up)
            snd_emu10k1_intr_enable(emu, midi->rx_enable);
      else
            snd_emu10k1_intr_disable(emu, midi->rx_enable);
}

static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
      struct snd_emu10k1 *emu;
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
      unsigned long flags;

      emu = midi->emu;
      snd_assert(emu, return);

      if (up) {
            int max = 4;
            unsigned char byte;
      
            /* try to send some amount of bytes here before interrupts */
            spin_lock_irqsave(&midi->output_lock, flags);
            while (max > 0) {
                  if (mpu401_output_ready(emu, midi)) {
                        if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT) ||
                            snd_rawmidi_transmit(substream, &byte, 1) != 1) {
                              /* no more data */
                              spin_unlock_irqrestore(&midi->output_lock, flags);
                              return;
                        }
                        mpu401_write_data(emu, midi, byte);
                        max--;
                  } else {
                        break;
                  }
            }
            spin_unlock_irqrestore(&midi->output_lock, flags);
            snd_emu10k1_intr_enable(emu, midi->tx_enable);
      } else {
            snd_emu10k1_intr_disable(emu, midi->tx_enable);
      }
}

/*

 */

static struct snd_rawmidi_ops snd_emu10k1_midi_output =
{
      .open =           snd_emu10k1_midi_output_open,
      .close =    snd_emu10k1_midi_output_close,
      .trigger =  snd_emu10k1_midi_output_trigger,
};

static struct snd_rawmidi_ops snd_emu10k1_midi_input =
{
      .open =           snd_emu10k1_midi_input_open,
      .close =    snd_emu10k1_midi_input_close,
      .trigger =  snd_emu10k1_midi_input_trigger,
};

static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi)
{
      struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)rmidi->private_data;
      midi->interrupt = NULL;
      midi->rmidi = NULL;
}

static int __devinit emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, int device, char *name)
{
      struct snd_rawmidi *rmidi;
      int err;

      if ((err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi)) < 0)
            return err;
      midi->emu = emu;
      spin_lock_init(&midi->open_lock);
      spin_lock_init(&midi->input_lock);
      spin_lock_init(&midi->output_lock);
      strcpy(rmidi->name, name);
      snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1_midi_output);
      snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_midi_input);
      rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
                           SNDRV_RAWMIDI_INFO_INPUT |
                           SNDRV_RAWMIDI_INFO_DUPLEX;
      rmidi->private_data = midi;
      rmidi->private_free = snd_emu10k1_midi_free;
      midi->rmidi = rmidi;
      return 0;
}

int __devinit snd_emu10k1_midi(struct snd_emu10k1 *emu)
{
      struct snd_emu10k1_midi *midi = &emu->midi;
      int err;

      if ((err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)")) < 0)
            return err;

      midi->tx_enable = INTE_MIDITXENABLE;
      midi->rx_enable = INTE_MIDIRXENABLE;
      midi->port = MUDATA;
      midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
      midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
      midi->interrupt = snd_emu10k1_midi_interrupt;
      return 0;
}

int __devinit snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu)
{
      struct snd_emu10k1_midi *midi;
      int err;

      midi = &emu->midi;
      if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0)
            return err;

      midi->tx_enable = INTE_MIDITXENABLE;
      midi->rx_enable = INTE_MIDIRXENABLE;
      midi->port = A_MUDATA1;
      midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
      midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
      midi->interrupt = snd_emu10k1_midi_interrupt;

      midi = &emu->midi2;
      if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0)
            return err;

      midi->tx_enable = INTE_A_MIDITXENABLE2;
      midi->rx_enable = INTE_A_MIDIRXENABLE2;
      midi->port = A_MUDATA2;
      midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2;
      midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2;
      midi->interrupt = snd_emu10k1_midi_interrupt2;
      return 0;
}

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