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opl3_oss.c

/*
 *  Interface for OSS sequencer emulation
 *
 *  Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
 *
 *   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 "opl3_voice.h"
#include <linux/slab.h>

static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);

/* */

static inline mm_segment_t snd_enter_user(void)
{
      mm_segment_t fs = get_fs();
      set_fs(get_ds());
      return fs;
}

static inline void snd_leave_user(mm_segment_t fs)
{
      set_fs(fs);
}

/* operators */

extern struct snd_midi_op opl3_ops;

static struct snd_seq_oss_callback oss_callback = {
      .owner =    THIS_MODULE,
      .open =           snd_opl3_open_seq_oss,
      .close =    snd_opl3_close_seq_oss,
      .ioctl =    snd_opl3_ioctl_seq_oss,
      .load_patch =     snd_opl3_load_patch_seq_oss,
      .reset =    snd_opl3_reset_seq_oss,
};

static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
                            void *private_data, int atomic, int hop)
{
      struct snd_opl3 *opl3 = private_data;

      if (ev->type != SNDRV_SEQ_EVENT_OSS)
            snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
      return 0;
}

/* ------------------------------ */

static void snd_opl3_oss_free_port(void *private_data)
{
      struct snd_opl3 *opl3 = private_data;

      snd_midi_channel_free_set(opl3->oss_chset);
}

static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
{
      struct snd_seq_port_callback callbacks;
      char name[32];
      int voices, opl_ver;

      voices = (opl3->hardware < OPL3_HW_OPL3) ?
            MAX_OPL2_VOICES : MAX_OPL3_VOICES;
      opl3->oss_chset = snd_midi_channel_alloc_set(voices);
      if (opl3->oss_chset == NULL)
            return -ENOMEM;
      opl3->oss_chset->private_data = opl3;

      memset(&callbacks, 0, sizeof(callbacks));
      callbacks.owner = THIS_MODULE;
      callbacks.event_input = snd_opl3_oss_event_input;
      callbacks.private_free = snd_opl3_oss_free_port;
      callbacks.private_data = opl3;

      opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
      sprintf(name, "OPL%i OSS Port", opl_ver);

      opl3->oss_chset->client = opl3->seq_client;
      opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
                                            SNDRV_SEQ_PORT_CAP_WRITE,
                                            SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
                                            SNDRV_SEQ_PORT_TYPE_MIDI_GM |
                                            SNDRV_SEQ_PORT_TYPE_HARDWARE |
                                            SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
                                            voices, voices,
                                            name);
      if (opl3->oss_chset->port < 0) {
            int port;
            port = opl3->oss_chset->port;
            snd_midi_channel_free_set(opl3->oss_chset);
            return port;
      }
      return 0;
}

/* ------------------------------ */

/* register OSS synth */
void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
{
      struct snd_seq_oss_reg *arg;
      struct snd_seq_device *dev;

      if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
                         sizeof(struct snd_seq_oss_reg), &dev) < 0)
            return;

      opl3->oss_seq_dev = dev;
      strlcpy(dev->name, name, sizeof(dev->name));
      arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
      arg->type = SYNTH_TYPE_FM;
      if (opl3->hardware < OPL3_HW_OPL3) {
            arg->subtype = FM_TYPE_ADLIB;
            arg->nvoices = MAX_OPL2_VOICES;
      } else {
            arg->subtype = FM_TYPE_OPL3;
            arg->nvoices = MAX_OPL3_VOICES;
      }
      arg->oper = oss_callback;
      arg->private_data = opl3;

      if (snd_opl3_oss_create_port(opl3)) {
            /* register to OSS synth table */
            snd_device_register(opl3->card, dev);
      }
}

/* unregister */
void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
{
      if (opl3->oss_seq_dev) {
            /* The instance should have been released in prior */
            opl3->oss_seq_dev = NULL;
      }
}

/* ------------------------------ */

/* open OSS sequencer */
static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
{
      struct snd_opl3 *opl3 = closure;
      int err;

      if (snd_BUG_ON(!arg))
            return -ENXIO;

      if ((err = snd_opl3_synth_setup(opl3)) < 0)
            return err;

      /* fill the argument data */
      arg->private_data = opl3;
      arg->addr.client = opl3->oss_chset->client;
      arg->addr.port = opl3->oss_chset->port;

      if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
            return err;

      opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
      return 0;
}

/* close OSS sequencer */
static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
{
      struct snd_opl3 *opl3;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      opl3 = arg->private_data;

      snd_opl3_synth_cleanup(opl3);

      snd_opl3_synth_use_dec(opl3);
      return 0;
}

/* load patch */

/* from sound_config.h */
#define SBFM_MAXINSTR   256

static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
                               const char __user *buf, int offs, int count)
{
      struct snd_opl3 *opl3;
      struct sbi_instrument sbi;
      char name[32];
      int err, type;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      opl3 = arg->private_data;

      if (format == FM_PATCH)
            type = FM_PATCH_OPL2;
      else if (format == OPL3_PATCH)
            type = FM_PATCH_OPL3;
      else
            return -EINVAL;

      if (count < (int)sizeof(sbi)) {
            snd_printk(KERN_ERR "FM Error: Patch record too short\n");
            return -EINVAL;
      }
      if (copy_from_user(&sbi, buf, sizeof(sbi)))
            return -EFAULT;

      if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
            snd_printk(KERN_ERR "FM Error: Invalid instrument number %d\n",
                     sbi.channel);
            return -EINVAL;
      }

      memset(name, 0, sizeof(name));
      sprintf(name, "Chan%d", sbi.channel);

      err = snd_opl3_load_patch(opl3, sbi.channel, 127, type, name, NULL,
                          sbi.operators);
      if (err < 0)
            return err;

      return sizeof(sbi);
}

/* ioctl */
static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
                          unsigned long ioarg)
{
      struct snd_opl3 *opl3;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      opl3 = arg->private_data;
      switch (cmd) {
            case SNDCTL_FM_LOAD_INSTR:
                  snd_printk(KERN_ERR "OPL3: "
                           "Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. "
                           "Fix the program.\n");
                  return -EINVAL;

            case SNDCTL_SYNTH_MEMAVL:
                  return 0x7fffffff;

            case SNDCTL_FM_4OP_ENABLE:
                  // handled automatically by OPL instrument type
                  return 0;

            default:
                  return -EINVAL;
      }
      return 0;
}

/* reset device */
static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
{
      struct snd_opl3 *opl3;

      if (snd_BUG_ON(!arg))
            return -ENXIO;
      opl3 = arg->private_data;

      return 0;
}

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