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-rw-r--r--sound/oss/midi_synth.c697
1 files changed, 697 insertions, 0 deletions
diff --git a/sound/oss/midi_synth.c b/sound/oss/midi_synth.c
new file mode 100644
index 000000000000..972edc62afd1
--- /dev/null
+++ b/sound/oss/midi_synth.c
@@ -0,0 +1,697 @@
+/*
+ * sound/midi_synth.c
+ *
+ * High level midi sequencer manager for dumb MIDI interfaces.
+ */
+/*
+ * Copyright (C) by Hannu Savolainen 1993-1997
+ *
+ * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
+ * Version 2 (June 1991). See the "COPYING" file distributed with this software
+ * for more info.
+ */
+/*
+ * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
+ * Andrew Veliath : fixed running status in MIDI input state machine
+ */
+#define USE_SEQ_MACROS
+#define USE_SIMPLE_MACROS
+
+#include "sound_config.h"
+
+#define _MIDI_SYNTH_C_
+
+#include "midi_synth.h"
+
+static int midi2synth[MAX_MIDI_DEV];
+static int sysex_state[MAX_MIDI_DEV] =
+{0};
+static unsigned char prev_out_status[MAX_MIDI_DEV];
+
+#define STORE(cmd) \
+{ \
+ int len; \
+ unsigned char obuf[8]; \
+ cmd; \
+ seq_input_event(obuf, len); \
+}
+
+#define _seqbuf obuf
+#define _seqbufptr 0
+#define _SEQ_ADVBUF(x) len=x
+
+void
+do_midi_msg(int synthno, unsigned char *msg, int mlen)
+{
+ switch (msg[0] & 0xf0)
+ {
+ case 0x90:
+ if (msg[2] != 0)
+ {
+ STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
+ break;
+ }
+ msg[2] = 64;
+
+ case 0x80:
+ STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
+ break;
+
+ case 0xA0:
+ STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
+ break;
+
+ case 0xB0:
+ STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
+ msg[1], msg[2]));
+ break;
+
+ case 0xC0:
+ STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
+ break;
+
+ case 0xD0:
+ STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
+ break;
+
+ case 0xE0:
+ STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
+ (msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
+ break;
+
+ default:
+ /* printk( "MPU: Unknown midi channel message %02x\n", msg[0]); */
+ ;
+ }
+}
+
+static void
+midi_outc(int midi_dev, int data)
+{
+ int timeout;
+
+ for (timeout = 0; timeout < 3200; timeout++)
+ if (midi_devs[midi_dev]->outputc(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 ((char *) 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 orig_dev, unsigned char data)
+{
+ int dev;
+ struct midi_input_info *inc;
+
+ static unsigned char len_tab[] = /* # of data bytes following a status
+ */
+ {
+ 2, /* 8x */
+ 2, /* 9x */
+ 2, /* Ax */
+ 2, /* Bx */
+ 1, /* Cx */
+ 1, /* Dx */
+ 2, /* Ex */
+ 0 /* Fx */
+ };
+
+ if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
+ return;
+
+ if (data == 0xfe) /* Ignore active sensing */
+ return;
+
+ dev = midi2synth[orig_dev];
+ inc = &midi_devs[orig_dev]->in_info;
+
+ switch (inc->m_state)
+ {
+ case MST_INIT:
+ if (data & 0x80) /* MIDI status byte */
+ {
+ if ((data & 0xf0) == 0xf0) /* Common message */
+ {
+ switch (data)
+ {
+ case 0xf0: /* Sysex */
+ inc->m_state = MST_SYSEX;
+ break; /* Sysex */
+
+ case 0xf1: /* MTC quarter frame */
+ case 0xf3: /* Song select */
+ inc->m_state = MST_DATA;
+ inc->m_ptr = 1;
+ inc->m_left = 1;
+ inc->m_buf[0] = data;
+ break;
+
+ case 0xf2: /* Song position pointer */
+ inc->m_state = MST_DATA;
+ inc->m_ptr = 1;
+ inc->m_left = 2;
+ inc->m_buf[0] = data;
+ break;
+
+ default:
+ inc->m_buf[0] = data;
+ inc->m_ptr = 1;
+ do_midi_msg(dev, inc->m_buf, inc->m_ptr);
+ inc->m_ptr = 0;
+ inc->m_left = 0;
+ }
+ } else
+ {
+ inc->m_state = MST_DATA;
+ inc->m_ptr = 1;
+ inc->m_left = len_tab[(data >> 4) - 8];
+ inc->m_buf[0] = inc->m_prev_status = data;
+ }
+ } else if (inc->m_prev_status & 0x80) {
+ /* Data byte (use running status) */
+ inc->m_ptr = 2;
+ inc->m_buf[1] = data;
+ inc->m_buf[0] = inc->m_prev_status;
+ inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
+ if (inc->m_left > 0)
+ inc->m_state = MST_DATA; /* Not done yet */
+ else {
+ inc->m_state = MST_INIT;
+ do_midi_msg(dev, inc->m_buf, inc->m_ptr);
+ inc->m_ptr = 0;
+ }
+ }
+ break; /* MST_INIT */
+
+ case MST_DATA:
+ inc->m_buf[inc->m_ptr++] = data;
+ if (--inc->m_left <= 0)
+ {
+ inc->m_state = MST_INIT;
+ do_midi_msg(dev, inc->m_buf, inc->m_ptr);
+ inc->m_ptr = 0;
+ }
+ break; /* MST_DATA */
+
+ case MST_SYSEX:
+ if (data == 0xf7) /* Sysex end */
+ {
+ inc->m_state = MST_INIT;
+ inc->m_left = 0;
+ inc->m_ptr = 0;
+ }
+ break; /* MST_SYSEX */
+
+ default:
+ printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
+ inc->m_state = MST_INIT;
+ }
+}
+
+static void
+leave_sysex(int dev)
+{
+ int orig_dev = synth_devs[dev]->midi_dev;
+ int timeout = 0;
+
+ if (!sysex_state[dev])
+ return;
+
+ sysex_state[dev] = 0;
+
+ while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
+ timeout < 1000)
+ timeout++;
+
+ sysex_state[dev] = 0;
+}
+
+static void
+midi_synth_output(int dev)
+{
+ /*
+ * Currently NOP
+ */
+}
+
+int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
+{
+ /*
+ * int orig_dev = synth_devs[dev]->midi_dev;
+ */
+
+ switch (cmd) {
+
+ case SNDCTL_SYNTH_INFO:
+ if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
+ return -EFAULT;
+ return 0;
+
+ case SNDCTL_SYNTH_MEMAVL:
+ return 0x7fffffff;
+
+ default:
+ return -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;
+
+ leave_sysex(dev);
+
+ 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)
+ instr_no = 0;
+ if (channel < 0 || channel > 15)
+ return 0;
+
+ leave_sysex(dev);
+
+ 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;
+
+ leave_sysex(dev);
+
+ 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)
+{
+
+ leave_sysex(dev);
+}
+
+int
+midi_synth_open(int dev, int mode)
+{
+ int orig_dev = synth_devs[dev]->midi_dev;
+ int err;
+ struct midi_input_info *inc;
+
+ if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
+ return -ENXIO;
+
+ midi2synth[orig_dev] = dev;
+ sysex_state[dev] = 0;
+ 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;
+ inc = &midi_devs[orig_dev]->in_info;
+
+ /* save_flags(flags);
+ cli();
+ don't know against what irqhandler to protect*/
+ inc->m_busy = 0;
+ inc->m_state = MST_INIT;
+ inc->m_ptr = 0;
+ inc->m_left = 0;
+ inc->m_prev_status = 0x00;
+ /* restore_flags(flags); */
+
+ return 1;
+}
+
+void
+midi_synth_close(int dev)
+{
+ int orig_dev = synth_devs[dev]->midi_dev;
+
+ leave_sysex(dev);
+
+ /*
+ * Shut up the synths by sending just single active sensing message.
+ */
+ midi_devs[orig_dev]->outputc(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, const char __user *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;
+ int hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;
+
+ leave_sysex(dev);
+
+ if (!prefix_cmd(orig_dev, 0xf0))
+ return 0;
+
+ if (format != SYSEX_PATCH)
+ {
+/* printk("MIDI Error: Invalid patch format (key) 0x%x\n", format);*/
+ return -EINVAL;
+ }
+ if (count < hdr_size)
+ {
+/* printk("MIDI Error: Patch header too short\n");*/
+ return -EINVAL;
+ }
+ count -= hdr_size;
+
+ /*
+ * Copy the header from user space but ignore the first bytes which have
+ * been transferred already.
+ */
+
+ if(copy_from_user(&((char *) &sysex)[offs], &(addr)[offs], hdr_size - offs))
+ return -EFAULT;
+
+ if (count < sysex.len)
+ {
+/* printk(KERN_WARNING "MIDI Warning: Sysex record too short (%d<%d)\n", count, (int) sysex.len);*/
+ sysex.len = count;
+ }
+ left = sysex.len;
+ src_offs = 0;
+
+ for (i = 0; i < left && !signal_pending(current); i++)
+ {
+ unsigned char data;
+
+ get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));
+
+ eox_seen = (i > 0 && data & 0x80); /* End of sysex */
+
+ if (eox_seen && data != 0xf7)
+ data = 0xf7;
+
+ if (i == 0)
+ {
+ if (data != 0xf0)
+ {
+ printk(KERN_WARNING "midi_synth: Sysex start missing\n");
+ return -EINVAL;
+ }
+ }
+ while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
+ !signal_pending(current))
+ schedule();
+
+ 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;
+
+ leave_sysex(dev);
+
+ 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 < 0 || ctrl_num > 127)
+ return;
+ if (channel < 0 || channel > 15)
+ return;
+
+ leave_sysex(dev);
+
+ 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);
+}
+
+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;
+
+ leave_sysex(dev);
+
+ 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);
+}
+
+void
+midi_synth_setup_voice(int dev, int voice, int channel)
+{
+}
+
+int
+midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
+{
+ int orig_dev = synth_devs[dev]->midi_dev;
+ int i;
+
+ for (i = 0; i < len; i++)
+ {
+ switch (bytes[i])
+ {
+ case 0xf0: /* Start sysex */
+ if (!prefix_cmd(orig_dev, 0xf0))
+ return 0;
+ sysex_state[dev] = 1;
+ break;
+
+ case 0xf7: /* End sysex */
+ if (!sysex_state[dev]) /* Orphan sysex end */
+ return 0;
+ sysex_state[dev] = 0;
+ break;
+
+ default:
+ if (!sysex_state[dev])
+ return 0;
+
+ if (bytes[i] & 0x80) /* Error. Another message before sysex end */
+ {
+ bytes[i] = 0xf7; /* Sysex end */
+ sysex_state[dev] = 0;
+ }
+ }
+
+ if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
+ {
+/*
+ * Hardware level buffer is full. Abort the sysex message.
+ */
+
+ int timeout = 0;
+
+ bytes[i] = 0xf7;
+ sysex_state[dev] = 0;
+
+ while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
+ timeout < 1000)
+ timeout++;
+ }
+ if (!sysex_state[dev])
+ return 0;
+ }
+
+ return 0;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.