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emux_oss.c

/*
 *  Interface for OSS sequencer emulation
 *
 *  Copyright (C) 1999 Takashi Iwai <tiwai@suse.de>
 *
 *   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
 *
 * Changes
 * 19990227   Steve Ratcliffe   Made separate file and merged in latest
 *                      midi emulation.
 */


#ifdef CONFIG_SND_SEQUENCER_OSS

#include <asm/uaccess.h>
#include <sound/core.h>
#include "emux_voice.h"
#include <sound/asoundef.h>

static int snd_emux_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
static int snd_emux_close_seq_oss(struct snd_seq_oss_arg *arg);
static int snd_emux_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
                          unsigned long ioarg);
static int snd_emux_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
                               const char __user *buf, int offs, int count);
static int snd_emux_reset_seq_oss(struct snd_seq_oss_arg *arg);
static int snd_emux_event_oss_input(struct snd_seq_event *ev, int direct,
                            void *private, int atomic, int hop);
static void reset_port_mode(struct snd_emux_port *port, int midi_mode);
static void emuspec_control(struct snd_emux *emu, struct snd_emux_port *port,
                      int cmd, unsigned char *event, int atomic, int hop);
static void gusspec_control(struct snd_emux *emu, struct snd_emux_port *port,
                      int cmd, unsigned char *event, int atomic, int hop);
static void fake_event(struct snd_emux *emu, struct snd_emux_port *port,
                   int ch, int param, int val, int atomic, int hop);

/* operators */
static struct snd_seq_oss_callback oss_callback = {
      .owner = THIS_MODULE,
      .open = snd_emux_open_seq_oss,
      .close = snd_emux_close_seq_oss,
      .ioctl = snd_emux_ioctl_seq_oss,
      .load_patch = snd_emux_load_patch_seq_oss,
      .reset = snd_emux_reset_seq_oss,
};


/*
 * register OSS synth
 */

void
snd_emux_init_seq_oss(struct snd_emux *emu)
{
      struct snd_seq_oss_reg *arg;
      struct snd_seq_device *dev;

      if (snd_seq_device_new(emu->card, 0, SNDRV_SEQ_DEV_ID_OSS,
                         sizeof(struct snd_seq_oss_reg), &dev) < 0)
            return;

      emu->oss_synth = dev;
      strcpy(dev->name, emu->name);
      arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
      arg->type = SYNTH_TYPE_SAMPLE;
      arg->subtype = SAMPLE_TYPE_AWE32;
      arg->nvoices = emu->max_voices;
      arg->oper = oss_callback;
      arg->private_data = emu;

      /* register to OSS synth table */
      snd_device_register(emu->card, dev);
}


/*
 * unregister
 */
void
snd_emux_detach_seq_oss(struct snd_emux *emu)
{
      if (emu->oss_synth) {
            snd_device_free(emu->card, emu->oss_synth);
            emu->oss_synth = NULL;
      }
}


/* use port number as a unique soundfont client number */
#define SF_CLIENT_NO(p) ((p) + 0x1000)

/*
 * open port for OSS sequencer
 */
static int
snd_emux_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
{
      struct snd_emux *emu;
      struct snd_emux_port *p;
      struct snd_seq_port_callback callback;
      char tmpname[64];

      emu = closure;
      if (snd_BUG_ON(!arg || !emu))
            return -ENXIO;

      mutex_lock(&emu->register_mutex);

      if (!snd_emux_inc_count(emu)) {
            mutex_unlock(&emu->register_mutex);
            return -EFAULT;
      }

      memset(&callback, 0, sizeof(callback));
      callback.owner = THIS_MODULE;
      callback.event_input = snd_emux_event_oss_input;

      sprintf(tmpname, "%s OSS Port", emu->name);
      p = snd_emux_create_port(emu, tmpname, 32,
                         1, &callback);
      if (p == NULL) {
            snd_printk("can't create port\n");
            snd_emux_dec_count(emu);
            mutex_unlock(&emu->register_mutex);
            return -ENOMEM;
      }

      /* fill the argument data */
      arg->private_data = p;
      arg->addr.client = p->chset.client;
      arg->addr.port = p->chset.port;
      p->oss_arg = arg;

      reset_port_mode(p, arg->seq_mode);

      snd_emux_reset_port(p);

      mutex_unlock(&emu->register_mutex);
      return 0;
}


#define DEFAULT_DRUM_FLAGS    ((1<<9) | (1<<25))

/*
 * reset port mode
 */
static void
reset_port_mode(struct snd_emux_port *port, int midi_mode)
{
      if (midi_mode) {
            port->port_mode = SNDRV_EMUX_PORT_MODE_OSS_MIDI;
            port->drum_flags = DEFAULT_DRUM_FLAGS;
            port->volume_atten = 0;
            port->oss_arg->event_passing = SNDRV_SEQ_OSS_PROCESS_KEYPRESS;
      } else {
            port->port_mode = SNDRV_EMUX_PORT_MODE_OSS_SYNTH;
            port->drum_flags = 0;
            port->volume_atten = 32;
            port->oss_arg->event_passing = SNDRV_SEQ_OSS_PROCESS_EVENTS;
      }
}


/*
 * close port
 */
static int
snd_emux_close_seq_oss(struct snd_seq_oss_arg *arg)
{
      struct snd_emux *emu;
      struct snd_emux_port *p;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      p = arg->private_data;
      if (snd_BUG_ON(!p))
            return -ENXIO;

      emu = p->emu;
      if (snd_BUG_ON(!emu))
            return -ENXIO;

      mutex_lock(&emu->register_mutex);
      snd_emux_sounds_off_all(p);
      snd_soundfont_close_check(emu->sflist, SF_CLIENT_NO(p->chset.port));
      snd_seq_event_port_detach(p->chset.client, p->chset.port);
      snd_emux_dec_count(emu);

      mutex_unlock(&emu->register_mutex);
      return 0;
}


/*
 * load patch
 */
static int
snd_emux_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
                      const char __user *buf, int offs, int count)
{
      struct snd_emux *emu;
      struct snd_emux_port *p;
      int rc;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      p = arg->private_data;
      if (snd_BUG_ON(!p))
            return -ENXIO;

      emu = p->emu;
      if (snd_BUG_ON(!emu))
            return -ENXIO;

      if (format == GUS_PATCH)
            rc = snd_soundfont_load_guspatch(emu->sflist, buf, count,
                                     SF_CLIENT_NO(p->chset.port));
      else if (format == SNDRV_OSS_SOUNDFONT_PATCH) {
            struct soundfont_patch_info patch;
            if (count < (int)sizeof(patch))
                  rc = -EINVAL;
            if (copy_from_user(&patch, buf, sizeof(patch)))
                  rc = -EFAULT;
            if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
                patch.type <= SNDRV_SFNT_PROBE_DATA)
                  rc = snd_soundfont_load(emu->sflist, buf, count, SF_CLIENT_NO(p->chset.port));
            else {
                  if (emu->ops.load_fx)
                        rc = emu->ops.load_fx(emu, patch.type, patch.optarg, buf, count);
                  else
                        rc = -EINVAL;
            }
      } else
            rc = 0;
      return rc;
}


/*
 * ioctl
 */
static int
snd_emux_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg)
{
      struct snd_emux_port *p;
      struct snd_emux *emu;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      p = arg->private_data;
      if (snd_BUG_ON(!p))
            return -ENXIO;

      emu = p->emu;
      if (snd_BUG_ON(!emu))
            return -ENXIO;

      switch (cmd) {
      case SNDCTL_SEQ_RESETSAMPLES:
            snd_soundfont_remove_samples(emu->sflist);
            return 0;
                  
      case SNDCTL_SYNTH_MEMAVL:
            if (emu->memhdr)
                  return snd_util_mem_avail(emu->memhdr);
            return 0;
      }

      return 0;
}


/*
 * reset device
 */
static int
snd_emux_reset_seq_oss(struct snd_seq_oss_arg *arg)
{
      struct snd_emux_port *p;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      p = arg->private_data;
      if (snd_BUG_ON(!p))
            return -ENXIO;
      snd_emux_reset_port(p);
      return 0;
}


/*
 * receive raw events: only SEQ_PRIVATE is accepted.
 */
static int
snd_emux_event_oss_input(struct snd_seq_event *ev, int direct, void *private_data,
                   int atomic, int hop)
{
      struct snd_emux *emu;
      struct snd_emux_port *p;
      unsigned char cmd, *data;

      p = private_data;
      if (snd_BUG_ON(!p))
            return -EINVAL;
      emu = p->emu;
      if (snd_BUG_ON(!emu))
            return -EINVAL;
      if (ev->type != SNDRV_SEQ_EVENT_OSS)
            return snd_emux_event_input(ev, direct, private_data, atomic, hop);

      data = ev->data.raw8.d;
      /* only SEQ_PRIVATE is accepted */
      if (data[0] != 0xfe)
            return 0;
      cmd = data[2] & _EMUX_OSS_MODE_VALUE_MASK;
      if (data[2] & _EMUX_OSS_MODE_FLAG)
            emuspec_control(emu, p, cmd, data, atomic, hop);
      else
            gusspec_control(emu, p, cmd, data, atomic, hop);
      return 0;
}


/*
 * OSS/AWE driver specific h/w controls
 */
static void
emuspec_control(struct snd_emux *emu, struct snd_emux_port *port, int cmd,
            unsigned char *event, int atomic, int hop)
{
      int voice;
      unsigned short p1;
      short p2;
      int i;
      struct snd_midi_channel *chan;

      voice = event[3];
      if (voice < 0 || voice >= port->chset.max_channels)
            chan = NULL;
      else
            chan = &port->chset.channels[voice];

      p1 = *(unsigned short *) &event[4];
      p2 = *(short *) &event[6];

      switch (cmd) {
#if 0 /* don't do this atomically */
      case _EMUX_OSS_REMOVE_LAST_SAMPLES:
            snd_soundfont_remove_unlocked(emu->sflist);
            break;
#endif
      case _EMUX_OSS_SEND_EFFECT:
            if (chan)
                  snd_emux_send_effect_oss(port, chan, p1, p2);
            break;
            
      case _EMUX_OSS_TERMINATE_ALL:
            snd_emux_terminate_all(emu);
            break;

      case _EMUX_OSS_TERMINATE_CHANNEL:
            /*snd_emux_mute_channel(emu, chan);*/
            break;
      case _EMUX_OSS_RESET_CHANNEL:
            /*snd_emux_channel_init(chset, chan);*/
            break;

      case _EMUX_OSS_RELEASE_ALL:
            fake_event(emu, port, voice, MIDI_CTL_ALL_NOTES_OFF, 0, atomic, hop);
            break;
      case _EMUX_OSS_NOTEOFF_ALL:
            fake_event(emu, port, voice, MIDI_CTL_ALL_SOUNDS_OFF, 0, atomic, hop);
            break;

      case _EMUX_OSS_INITIAL_VOLUME:
            if (p2) {
                  port->volume_atten = (short)p1;
                  snd_emux_update_port(port, SNDRV_EMUX_UPDATE_VOLUME);
            }
            break;

      case _EMUX_OSS_CHN_PRESSURE:
            if (chan) {
                  chan->midi_pressure = p1;
                  snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_FMMOD|SNDRV_EMUX_UPDATE_FM2FRQ2);
            }
            break;

      case _EMUX_OSS_CHANNEL_MODE:
            reset_port_mode(port, p1);
            snd_emux_reset_port(port);
            break;

      case _EMUX_OSS_DRUM_CHANNELS:
            port->drum_flags = *(unsigned int*)&event[4];
            for (i = 0; i < port->chset.max_channels; i++) {
                  chan = &port->chset.channels[i];
                  chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
            }
            break;

      case _EMUX_OSS_MISC_MODE:
            if (p1 < EMUX_MD_END)
                  port->ctrls[p1] = p2;
            break;
      case _EMUX_OSS_DEBUG_MODE:
            break;

      default:
            if (emu->ops.oss_ioctl)
                  emu->ops.oss_ioctl(emu, cmd, p1, p2);
            break;
      }
}

/*
 * GUS specific h/w controls
 */

#include <linux/ultrasound.h>

static void
gusspec_control(struct snd_emux *emu, struct snd_emux_port *port, int cmd,
            unsigned char *event, int atomic, int hop)
{
      int voice;
      unsigned short p1;
      short p2;
      int plong;
      struct snd_midi_channel *chan;

      if (port->port_mode != SNDRV_EMUX_PORT_MODE_OSS_SYNTH)
            return;
      if (cmd == _GUS_NUMVOICES)
            return;
      voice = event[3];
      if (voice < 0 || voice >= port->chset.max_channels)
            return;

      chan = &port->chset.channels[voice];

      p1 = *(unsigned short *) &event[4];
      p2 = *(short *) &event[6];
      plong = *(int*) &event[4];

      switch (cmd) {
      case _GUS_VOICESAMPLE:
            chan->midi_program = p1;
            return;

      case _GUS_VOICEBALA:
            /* 0 to 15 --> 0 to 127 */
            chan->control[MIDI_CTL_MSB_PAN] = (int)p1 << 3;
            snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PAN);
            return;

      case _GUS_VOICEVOL:
      case _GUS_VOICEVOL2:
            /* not supported yet */
            return;

      case _GUS_RAMPRANGE:
      case _GUS_RAMPRATE:
      case _GUS_RAMPMODE:
      case _GUS_RAMPON:
      case _GUS_RAMPOFF:
            /* volume ramping not supported */
            return;

      case _GUS_VOLUME_SCALE:
            return;

      case _GUS_VOICE_POS:
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
            snd_emux_send_effect(port, chan, EMUX_FX_SAMPLE_START,
                             (short)(plong & 0x7fff),
                             EMUX_FX_FLAG_SET);
            snd_emux_send_effect(port, chan, EMUX_FX_COARSE_SAMPLE_START,
                             (plong >> 15) & 0xffff,
                             EMUX_FX_FLAG_SET);
#endif
            return;
      }
}


/*
 * send an event to midi emulation
 */
static void
fake_event(struct snd_emux *emu, struct snd_emux_port *port, int ch, int param, int val, int atomic, int hop)
{
      struct snd_seq_event ev;
      memset(&ev, 0, sizeof(ev));
      ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
      ev.data.control.channel = ch;
      ev.data.control.param = param;
      ev.data.control.value = val;
      snd_emux_event_input(&ev, 0, port, atomic, hop);
}

#endif /* CONFIG_SND_SEQUENCER_OSS */

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