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- /*
- * sound/midi_synth.c
- *
- * High level midi sequencer manager for dumb MIDI interfaces.
- *
- * Copyright by Hannu Savolainen 1993
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met: 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer. 2.
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- */
-
- #include "sound_config.h"
-
- #if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_MIDI)
-
- #define _MIDI_SYNTH_C_
-
- DEFINE_WAIT_QUEUE (sysex_sleeper, sysex_sleep_flag);
-
- #include "midi_synth.h"
-
- static int midi2synth[MAX_MIDI_DEV];
- static unsigned char prev_out_status[MAX_MIDI_DEV];
-
- static void
- midi_outc (int midi_dev, int data)
- {
- int timeout;
-
- for (timeout = 0; timeout < 32000; timeout++)
- if (midi_devs[midi_dev]->putc (midi_dev, (unsigned char) (data & 0xff)))
- {
- if (data & 0x80) /*
- * Status byte
- */
- prev_out_status[midi_dev] =
- (unsigned char) (data & 0xff); /*
- * Store for running status
- */
- return; /*
- * Mission complete
- */
- }
-
- /*
- * Sorry! No space on buffers.
- */
- printk ("Midi send timed out\n");
- }
-
- static int
- prefix_cmd (int midi_dev, unsigned char status)
- {
- if (midi_devs[midi_dev]->prefix_cmd == NULL)
- return 1;
-
- return midi_devs[midi_dev]->prefix_cmd (midi_dev, status);
- }
-
- static void
- midi_synth_input (int dev, unsigned char data)
- {
- int orig_dev;
-
- if (dev < 0 || dev > num_synths)
- return;
-
- if (data == 0xfe) /* Ignore active sensing */
- return;
-
- orig_dev = midi2synth[dev];
-
- }
-
- static void
- midi_synth_output (int dev)
- {
- /*
- * Currently NOP
- */
- }
-
- int
- midi_synth_ioctl (int dev,
- unsigned int cmd, unsigned int arg)
- {
- /*
- * int orig_dev = synth_devs[dev]->midi_dev;
- */
-
- switch (cmd)
- {
-
- case SNDCTL_SYNTH_INFO:
- IOCTL_TO_USER ((char *) arg, 0, synth_devs[dev]->info,
- sizeof (struct synth_info));
-
- return 0;
- break;
-
- case SNDCTL_SYNTH_MEMAVL:
- return 0x7fffffff;
- break;
-
- default:
- return RET_ERROR (EINVAL);
- }
- }
-
- int
- midi_synth_kill_note (int dev, int channel, int note, int velocity)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int msg, chn;
-
- if (note < 0 || note > 127)
- return 0;
- if (channel < 0 || channel > 15)
- return 0;
- if (velocity < 0)
- velocity = 0;
- if (velocity > 127)
- velocity = 127;
-
- msg = prev_out_status[orig_dev] & 0xf0;
- chn = prev_out_status[orig_dev] & 0x0f;
-
- if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
- { /*
- * Use running status
- */
- if (!prefix_cmd (orig_dev, note))
- return 0;
-
- midi_outc (orig_dev, note);
-
- if (msg == 0x90) /*
- * Running status = Note on
- */
- midi_outc (orig_dev, 0);/*
- * Note on with velocity 0 == note
- * off
- */
- else
- midi_outc (orig_dev, velocity);
- }
- else
- {
- if (velocity == 64)
- {
- if (!prefix_cmd (orig_dev, 0x90 | (channel & 0x0f)))
- return 0;
- midi_outc (orig_dev, 0x90 | (channel & 0x0f)); /*
- * Note on
- */
- midi_outc (orig_dev, note);
- midi_outc (orig_dev, 0); /*
- * Zero G
- */
- }
- else
- {
- if (!prefix_cmd (orig_dev, 0x80 | (channel & 0x0f)))
- return 0;
- midi_outc (orig_dev, 0x80 | (channel & 0x0f)); /*
- * Note off
- */
- midi_outc (orig_dev, note);
- midi_outc (orig_dev, velocity);
- }
- }
-
- return 0;
- }
-
- int
- midi_synth_set_instr (int dev, int channel, int instr_no)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
-
- if (instr_no < 0 || instr_no > 127)
- return 0;
- if (channel < 0 || channel > 15)
- return 0;
-
- if (!prefix_cmd (orig_dev, 0xc0 | (channel & 0x0f)))
- return 0;
- midi_outc (orig_dev, 0xc0 | (channel & 0x0f)); /*
- * Program change
- */
- midi_outc (orig_dev, instr_no);
-
- return 0;
- }
-
- int
- midi_synth_start_note (int dev, int channel, int note, int velocity)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int msg, chn;
-
- if (note < 0 || note > 127)
- return 0;
- if (channel < 0 || channel > 15)
- return 0;
- if (velocity < 0)
- velocity = 0;
- if (velocity > 127)
- velocity = 127;
-
- msg = prev_out_status[orig_dev] & 0xf0;
- chn = prev_out_status[orig_dev] & 0x0f;
-
- if (chn == channel && msg == 0x90)
- { /*
- * Use running status
- */
- if (!prefix_cmd (orig_dev, note))
- return 0;
- midi_outc (orig_dev, note);
- midi_outc (orig_dev, velocity);
- }
- else
- {
- if (!prefix_cmd (orig_dev, 0x90 | (channel & 0x0f)))
- return 0;
- midi_outc (orig_dev, 0x90 | (channel & 0x0f)); /*
- * Note on
- */
- midi_outc (orig_dev, note);
- midi_outc (orig_dev, velocity);
- }
- return 0;
- }
-
- void
- midi_synth_reset (int dev)
- {
- }
-
- int
- midi_synth_open (int dev, int mode)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int err;
-
- if (orig_dev < 0 || orig_dev > num_midis)
- return RET_ERROR (ENXIO);
-
- midi2synth[orig_dev] = dev;
- prev_out_status[orig_dev] = 0;
-
- if ((err = midi_devs[orig_dev]->open (orig_dev, mode,
- midi_synth_input, midi_synth_output)) < 0)
- return err;
-
- return 1;
- }
-
- void
- midi_synth_close (int dev)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
-
- /*
- * Shut up the synths by sending just single active sensing message.
- */
- midi_devs[orig_dev]->putc (orig_dev, 0xfe);
-
- midi_devs[orig_dev]->close (orig_dev);
- }
-
- void
- midi_synth_hw_control (int dev, unsigned char *event)
- {
- }
-
- int
- midi_synth_load_patch (int dev, int format, snd_rw_buf * addr,
- int offs, int count, int pmgr_flag)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
-
- struct sysex_info sysex;
- int i;
- unsigned long left, src_offs, eox_seen = 0;
- int first_byte = 1;
-
- if (!prefix_cmd (orig_dev, 0xf0))
- return 0;
-
- if (format != SYSEX_PATCH)
- {
- printk ("MIDI Error: Invalid patch format (key) 0x%x\n", format);
- return RET_ERROR (EINVAL);
- }
-
- if (count < sizeof (struct sysex_info))
- {
- printk ("MIDI Error: Patch header too short\n");
- return RET_ERROR (EINVAL);
- }
-
- count -= sizeof (struct sysex_info);
-
- /*
- * Copy the header from user space but ignore the first bytes which have
- * been transferred already.
- */
-
- COPY_FROM_USER (&((char *) &sysex)[offs], addr, offs, sizeof (struct sysex_info) - offs);
-
- if (count < sysex.len)
- {
- printk ("MIDI Warning: Sysex record too short (%d<%d)\n",
- count, (int) sysex.len);
- sysex.len = count;
- }
-
- left = sysex.len;
- src_offs = 0;
-
- RESET_WAIT_QUEUE (sysex_sleeper, sysex_sleep_flag);
-
- for (i = 0; i < left && !PROCESS_ABORTING (sysex_sleeper, sysex_sleep_flag); i++)
- {
- unsigned char data;
-
- GET_BYTE_FROM_USER (data, addr, sizeof (struct sysex_info) + i);
-
- if (first_byte && data != 0xf0)
- midi_outc (orig_dev, 0xf0); /* Sysex start */
-
- eox_seen = (data == 0xf7);/*
- * Last byte was end of sysex
- */
-
- if (i == 0)
- {
- if (data != 0xf0) /*
- * Sysex start
- */
- return RET_ERROR (EINVAL);
- }
-
- while (!midi_devs[orig_dev]->putc (orig_dev, (unsigned char) (data & 0xff)) &&
- !PROCESS_ABORTING (sysex_sleeper, sysex_sleep_flag))
- DO_SLEEP (sysex_sleeper, sysex_sleep_flag, 1); /* Wait for timeout */
-
- if (!first_byte && data & 0x80)
- return 0;
- first_byte = 0;
- }
-
- if (!eox_seen)
- midi_outc (orig_dev, 0xf7);
- return 0;
- }
-
- void
- midi_synth_panning (int dev, int channel, int pressure)
- {
- }
-
- void
- midi_synth_aftertouch (int dev, int channel, int pressure)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int msg, chn;
-
- if (pressure < 0 || pressure > 127)
- return;
- if (channel < 0 || channel > 15)
- return;
-
- msg = prev_out_status[orig_dev] & 0xf0;
- chn = prev_out_status[orig_dev] & 0x0f;
-
- if (msg != 0xd0 || chn != channel) /*
- * Test for running status
- */
- {
- if (!prefix_cmd (orig_dev, 0xd0 | (channel & 0x0f)))
- return;
- midi_outc (orig_dev, 0xd0 | (channel & 0x0f)); /*
- * Channel pressure
- */
- }
- else if (!prefix_cmd (orig_dev, pressure))
- return;
- midi_outc (orig_dev, pressure);
- }
-
- void
- midi_synth_controller (int dev, int channel, int ctrl_num, int value)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int chn, msg;
-
- if (ctrl_num < 1 || ctrl_num > 127)
- return; /* NOTE! Controller # 0 ignored */
- if (channel < 0 || channel > 15)
- return;
-
- msg = prev_out_status[orig_dev] & 0xf0;
- chn = prev_out_status[orig_dev] & 0x0f;
-
- if (msg != 0xb0 || chn != channel)
- {
- if (!prefix_cmd (orig_dev, 0xb0 | (channel & 0x0f)))
- return;
- midi_outc (orig_dev, 0xb0 | (channel & 0x0f));
- }
- else if (!prefix_cmd (orig_dev, ctrl_num))
- return;
-
- midi_outc (orig_dev, ctrl_num);
- midi_outc (orig_dev, value & 0x7f);
- }
-
- int
- midi_synth_patchmgr (int dev, struct patmgr_info *rec)
- {
- return RET_ERROR (EINVAL);
- }
-
- void
- midi_synth_bender (int dev, int channel, int value)
- {
- int orig_dev = synth_devs[dev]->midi_dev;
- int msg, prev_chn;
-
- if (channel < 0 || channel > 15)
- return;
-
- if (value < 0 || value > 16383)
- return;
-
- msg = prev_out_status[orig_dev] & 0xf0;
- prev_chn = prev_out_status[orig_dev] & 0x0f;
-
- if (msg != 0xd0 || prev_chn != channel) /*
- * * Test for running status */
- {
- if (!prefix_cmd (orig_dev, 0xe0 | (channel & 0x0f)))
- return;
- midi_outc (orig_dev, 0xe0 | (channel & 0x0f));
- }
- else if (!prefix_cmd (orig_dev, value & 0x7f))
- return;
-
- midi_outc (orig_dev, value & 0x7f);
- midi_outc (orig_dev, (value >> 7) & 0x7f);
- }
-
- #endif
-