Logo Search packages:      
Sourcecode: alsa-driver version File versions  Download package

ca_midi.c

/* 
 *  Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
 *  Creative Audio MIDI, for the CA0106 Driver
 *  Version: 0.0.1
 *
 *  Changelog:
 *    Implementation is based on mpu401 and emu10k1x and
 *    tested with ca0106.
 *    mpu401: Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *    emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
 *
 *   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/spinlock.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/rawmidi.h>

#include "ca_midi.h"

#define ca_midi_write_data(midi, data)    midi->write(midi, data, 0)
#define ca_midi_write_cmd(midi, data)     midi->write(midi, data, 1)
#define ca_midi_read_data(midi)           midi->read(midi, 0)
#define ca_midi_read_stat(midi)           midi->read(midi, 1)
#define ca_midi_input_avail(midi)   (!(ca_midi_read_stat(midi) & midi->input_avail))
#define ca_midi_output_ready(midi)  (!(ca_midi_read_stat(midi) & midi->output_ready))

static void ca_midi_clear_rx(struct snd_ca_midi *midi)
{
      int timeout = 100000;
      for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
            ca_midi_read_data(midi);
#ifdef CONFIG_SND_DEBUG
      if (timeout <= 0)
            snd_printk(KERN_ERR "ca_midi_clear_rx: timeout (status = 0x%x)\n",
                     ca_midi_read_stat(midi));
#endif
}

static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status)
{
      unsigned char byte;

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

      spin_lock(&midi->input_lock);
      if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
            if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
                  ca_midi_clear_rx(midi);
            } else {
                  byte = ca_midi_read_data(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) && ca_midi_output_ready(midi)) {
            if (midi->substream_output &&
                snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
                  ca_midi_write_data(midi, byte);
            } else {
                  midi->interrupt_disable(midi,midi->tx_enable);
            }
      }
      spin_unlock(&midi->output_lock);

}

static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
{
      unsigned long flags;
      int timeout, ok;

      spin_lock_irqsave(&midi->input_lock, flags);
      ca_midi_write_data(midi, 0x00);
      /* ca_midi_clear_rx(midi); */

      ca_midi_write_cmd(midi, cmd);
      if (ack) {
            ok = 0;
            timeout = 10000;
            while (!ok && timeout-- > 0) {
                  if (ca_midi_input_avail(midi)) {
                        if (ca_midi_read_data(midi) == midi->ack)
                              ok = 1;
                  }
            }
            if (!ok && ca_midi_read_data(midi) == midi->ack)
                  ok = 1;
      } else {
            ok = 1;
      }
      spin_unlock_irqrestore(&midi->input_lock, flags);
      if (!ok)
            snd_printk(KERN_ERR "ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
                     cmd,
                     midi->get_dev_id_port(midi->dev_id),
                     ca_midi_read_stat(midi),
                     ca_midi_read_data(midi));
}

static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      unsigned long flags;
      
      snd_assert(midi->dev_id, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      midi->midi_mode |= CA_MIDI_MODE_INPUT;
      midi->substream_input = substream;
      if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            ca_midi_cmd(midi, midi->reset, 1);
            ca_midi_cmd(midi, midi->enter_uart, 1);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;
}

static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      unsigned long flags;

      snd_assert(midi->dev_id, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
      midi->substream_output = substream;
      if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            ca_midi_cmd(midi, midi->reset, 1);
            ca_midi_cmd(midi, midi->enter_uart, 1);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;
}

static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      unsigned long flags;

      snd_assert(midi->dev_id, return -ENXIO);
      spin_lock_irqsave(&midi->open_lock, flags);
      midi->interrupt_disable(midi,midi->rx_enable);
      midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
      midi->substream_input = NULL;
      if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            ca_midi_cmd(midi, midi->reset, 0);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;
}

static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      unsigned long flags;
      snd_assert(midi->dev_id, return -ENXIO);
      
      spin_lock_irqsave(&midi->open_lock, flags);

      midi->interrupt_disable(midi,midi->tx_enable);
      midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
      midi->substream_output = NULL;
      
      if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
            spin_unlock_irqrestore(&midi->open_lock, flags);
            ca_midi_cmd(midi, midi->reset, 0);
      } else {
            spin_unlock_irqrestore(&midi->open_lock, flags);
      }
      return 0;
}

static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      snd_assert(midi->dev_id, return);

      if (up) {
            midi->interrupt_enable(midi,midi->rx_enable);
      } else {
            midi->interrupt_disable(midi, midi->rx_enable);
      }
}

static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
      struct snd_ca_midi *midi = substream->rmidi->private_data;
      unsigned long flags;

      snd_assert(midi->dev_id, return);

      if (up) {
            int max = 4;
            unsigned char byte;

            spin_lock_irqsave(&midi->output_lock, flags);
      
            /* try to send some amount of bytes here before interrupts */
            while (max > 0) {
                  if (ca_midi_output_ready(midi)) {
                        if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
                            snd_rawmidi_transmit(substream, &byte, 1) != 1) {
                              /* no more data */
                              spin_unlock_irqrestore(&midi->output_lock, flags);
                              return;
                        }
                        ca_midi_write_data(midi, byte);
                        max--;
                  } else {
                        break;
                  }
            }

            spin_unlock_irqrestore(&midi->output_lock, flags);
            midi->interrupt_enable(midi,midi->tx_enable);

      } else {
            midi->interrupt_disable(midi,midi->tx_enable);
      }
}

static struct snd_rawmidi_ops ca_midi_output =
{
      .open =           ca_midi_output_open,
      .close =    ca_midi_output_close,
      .trigger =  ca_midi_output_trigger,
};

static struct snd_rawmidi_ops ca_midi_input =
{
      .open =           ca_midi_input_open,
      .close =    ca_midi_input_close,
      .trigger =  ca_midi_input_trigger,
};

static void ca_midi_free(struct snd_ca_midi *midi)
{
      midi->interrupt = NULL;
      midi->interrupt_enable = NULL;
      midi->interrupt_disable = NULL;
      midi->read = NULL;
      midi->write = NULL;
      midi->get_dev_id_card = NULL;
      midi->get_dev_id_port = NULL;
      midi->rmidi = NULL;
}

static void ca_rmidi_free(struct snd_rawmidi *rmidi)
{
      ca_midi_free(rmidi->private_data);
}

int __devinit ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
{
      struct snd_rawmidi *rmidi;
      int err;

      if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0)
            return err;

      midi->dev_id = dev_id;
      midi->interrupt = ca_midi_interrupt;

      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, &ca_midi_output);
      snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
      rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
                           SNDRV_RAWMIDI_INFO_INPUT |
                           SNDRV_RAWMIDI_INFO_DUPLEX;
      rmidi->private_data = midi;
      rmidi->private_free = ca_rmidi_free;
      
      midi->rmidi = rmidi;
      return 0;
}


Generated by  Doxygen 1.6.0   Back to index