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linux/sound/oss/wf_midi.c

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/*
* sound/wf_midi.c
*
* The low level driver for the WaveFront ICS2115 MIDI interface(s)
* Note that there is also an MPU-401 emulation (actually, a UART-401
* emulation) on the CS4232 on the Tropez Plus. This code has nothing
* to do with that interface at all.
*
* The interface is essentially just a UART-401, but is has the
* interesting property of supporting what Turtle Beach called
* "Virtual MIDI" mode. In this mode, there are effectively *two*
* MIDI buses accessible via the interface, one that is routed
* solely to/from the external WaveFront synthesizer and the other
* corresponding to the pin/socket connector used to link external
* MIDI devices to the board.
*
* This driver fully supports this mode, allowing two distinct
* midi devices (/dev/midiNN and /dev/midiNN+1) to be used
* completely independently, giving 32 channels of MIDI routing,
* 16 to the WaveFront synth and 16 to the external MIDI bus.
*
* Switching between the two is accomplished externally by the driver
* using the two otherwise unused MIDI bytes. See the code for more details.
*
* NOTE: VIRTUAL MIDI MODE IS ON BY DEFAULT (see wavefront.c)
*
* The main reason to turn off Virtual MIDI mode is when you want to
* tightly couple the WaveFront synth with an external MIDI
* device. You won't be able to distinguish the source of any MIDI
* data except via SysEx ID, but thats probably OK, since for the most
* part, the WaveFront won't be sending any MIDI data at all.
*
* The main reason to turn on Virtual MIDI Mode is to provide two
* completely independent 16-channel MIDI buses, one to the
* WaveFront and one to any external MIDI devices. Given the 32
* voice nature of the WaveFront, its pretty easy to find a use
* for all 16 channels driving just that synth.
*
*/
/*
* Copyright (C) by Paul Barton-Davis 1998
* Some portions of this file are derived from work that is:
*
* CopyriGht (C) by Hannu Savolainen 1993-1996
*
* USS/Lite 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.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include "sound_config.h"
#include <linux/wavefront.h>
#ifdef MODULE
struct wf_mpu_config {
int base;
#define DATAPORT(d) (d)->base
#define COMDPORT(d) (d)->base+1
#define STATPORT(d) (d)->base+1
int irq;
int opened;
int devno;
int synthno;
int mode;
#define MODE_MIDI 1
#define MODE_SYNTH 2
void (*inputintr) (int dev, unsigned char data);
char isvirtual; /* do virtual I/O stuff */
};
static struct wf_mpu_config devs[2];
static struct wf_mpu_config *phys_dev = &devs[0];
static struct wf_mpu_config *virt_dev = &devs[1];
static void start_uart_mode (void);
static DEFINE_SPINLOCK(lock);
#define OUTPUT_READY 0x40
#define INPUT_AVAIL 0x80
#define MPU_ACK 0xFE
#define UART_MODE_ON 0x3F
static inline int wf_mpu_status (void)
{
return inb (STATPORT (phys_dev));
}
static inline int input_avail (void)
{
return !(wf_mpu_status() & INPUT_AVAIL);
}
static inline int output_ready (void)
{
return !(wf_mpu_status() & OUTPUT_READY);
}
static inline int read_data (void)
{
return inb (DATAPORT (phys_dev));
}
static inline void write_data (unsigned char byte)
{
outb (byte, DATAPORT (phys_dev));
}
/*
* States for the input scanner (should be in dev_table.h)
*/
#define MST_SYSMSG 100 /* System message (sysx etc). */
#define MST_MTC 102 /* Midi Time Code (MTC) qframe msg */
#define MST_SONGSEL 103 /* Song select */
#define MST_SONGPOS 104 /* Song position pointer */
#define MST_TIMED 105 /* Leading timing byte rcvd */
/* buffer space check for input scanner */
#define BUFTEST(mi) if (mi->m_ptr >= MI_MAX || mi->m_ptr < 0) \
{printk(KERN_ERR "WF-MPU: Invalid buffer pointer %d/%d, s=%d\n", \
mi->m_ptr, mi->m_left, mi->m_state);mi->m_ptr--;}
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 */
};
static int
wf_mpu_input_scanner (int devno, int synthdev, unsigned char midic)
{
struct midi_input_info *mi = &midi_devs[devno]->in_info;
switch (mi->m_state) {
case MST_INIT:
switch (midic) {
case 0xf8:
/* Timer overflow */
break;
case 0xfc:
break;
case 0xfd:
/* XXX do something useful with this. If there is
an external MIDI timer (e.g. a hardware sequencer,
a useful timer can be derived ...
For now, no timer support.
*/
break;
case 0xfe:
return MPU_ACK;
break;
case 0xf0:
case 0xf1:
case 0xf2:
case 0xf3:
case 0xf4:
case 0xf5:
case 0xf6:
case 0xf7:
break;
case 0xf9:
break;
case 0xff:
mi->m_state = MST_SYSMSG;
break;
default:
if (midic <= 0xef) {
mi->m_state = MST_TIMED;
}
else
printk (KERN_ERR "<MPU: Unknown event %02x> ",
midic);
}
break;
case MST_TIMED:
{
int msg = ((int) (midic & 0xf0) >> 4);
mi->m_state = MST_DATA;
if (msg < 8) { /* Data byte */
msg = ((int) (mi->m_prev_status & 0xf0) >> 4);
msg -= 8;
mi->m_left = len_tab[msg] - 1;
mi->m_ptr = 2;
mi->m_buf[0] = mi->m_prev_status;
mi->m_buf[1] = midic;
if (mi->m_left <= 0) {
mi->m_state = MST_INIT;
do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
mi->m_ptr = 0;
}
} else if (msg == 0xf) { /* MPU MARK */
mi->m_state = MST_INIT;
switch (midic) {
case 0xf8:
break;
case 0xf9:
break;
case 0xfc:
break;
default:
break;
}
} else {
mi->m_prev_status = midic;
msg -= 8;
mi->m_left = len_tab[msg];
mi->m_ptr = 1;
mi->m_buf[0] = midic;
if (mi->m_left <= 0) {
mi->m_state = MST_INIT;
do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
mi->m_ptr = 0;
}
}
}
break;
case MST_SYSMSG:
switch (midic) {
case 0xf0:
mi->m_state = MST_SYSEX;
break;
case 0xf1:
mi->m_state = MST_MTC;
break;
case 0xf2:
mi->m_state = MST_SONGPOS;
mi->m_ptr = 0;
break;
case 0xf3:
mi->m_state = MST_SONGSEL;
break;
case 0xf6:
mi->m_state = MST_INIT;
/*
* Real time messages
*/
case 0xf8:
/* midi clock */
mi->m_state = MST_INIT;
/* XXX need ext MIDI timer support */
break;
case 0xfA:
mi->m_state = MST_INIT;
/* XXX need ext MIDI timer support */
break;
case 0xFB:
mi->m_state = MST_INIT;
/* XXX need ext MIDI timer support */
break;
case 0xFC:
mi->m_state = MST_INIT;
/* XXX need ext MIDI timer support */
break;
case 0xFE:
/* active sensing */
mi->m_state = MST_INIT;
break;
case 0xff:
mi->m_state = MST_INIT;
break;
default:
printk (KERN_ERR "unknown MIDI sysmsg %0x\n", midic);
mi->m_state = MST_INIT;
}
break;
case MST_MTC:
mi->m_state = MST_INIT;
break;
case MST_SYSEX:
if (midic == 0xf7) {
mi->m_state = MST_INIT;
} else {
/* XXX fix me */
}
break;
case MST_SONGPOS:
BUFTEST (mi);
mi->m_buf[mi->m_ptr++] = midic;
if (mi->m_ptr == 2) {
mi->m_state = MST_INIT;
mi->m_ptr = 0;
/* XXX need ext MIDI timer support */
}
break;
case MST_DATA:
BUFTEST (mi);
mi->m_buf[mi->m_ptr++] = midic;
if ((--mi->m_left) <= 0) {
mi->m_state = MST_INIT;
do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
mi->m_ptr = 0;
}
break;
default:
printk (KERN_ERR "Bad state %d ", mi->m_state);
mi->m_state = MST_INIT;
}
return 1;
}
static irqreturn_t
wf_mpuintr(int irq, void *dev_id, struct pt_regs *dummy)
{
struct wf_mpu_config *physical_dev = dev_id;
static struct wf_mpu_config *input_dev;
struct midi_input_info *mi = &midi_devs[physical_dev->devno]->in_info;
int n;
if (!input_avail()) { /* not for us */
return IRQ_NONE;
}
if (mi->m_busy)
return IRQ_HANDLED;
spin_lock(&lock);
mi->m_busy = 1;
if (!input_dev) {
input_dev = physical_dev;
}
n = 50; /* XXX why ? */
do {
unsigned char c = read_data ();
if (phys_dev->isvirtual) {
if (c == WF_EXTERNAL_SWITCH) {
input_dev = virt_dev;
continue;
} else if (c == WF_INTERNAL_SWITCH) {
input_dev = phys_dev;
continue;
} /* else just leave it as it is */
} else {
input_dev = phys_dev;
}
if (input_dev->mode == MODE_SYNTH) {
wf_mpu_input_scanner (input_dev->devno,
input_dev->synthno, c);
} else if (input_dev->opened & OPEN_READ) {
if (input_dev->inputintr) {
input_dev->inputintr (input_dev->devno, c);
}
}
} while (input_avail() && n-- > 0);
mi->m_busy = 0;
spin_unlock(&lock);
return IRQ_HANDLED;
}
static int
wf_mpu_open (int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
struct wf_mpu_config *devc;
if (dev < 0 || dev >= num_midis || midi_devs[dev]==NULL)
return -(ENXIO);
if (phys_dev->devno == dev) {
devc = phys_dev;
} else if (phys_dev->isvirtual && virt_dev->devno == dev) {
devc = virt_dev;
} else {
printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
return -(EINVAL);
}
if (devc->opened) {
return -(EBUSY);
}
devc->mode = MODE_MIDI;
devc->opened = mode;
devc->synthno = 0;
devc->inputintr = input;
return 0;
}
static void
wf_mpu_close (int dev)
{
struct wf_mpu_config *devc;
if (dev < 0 || dev >= num_midis || midi_devs[dev]==NULL)
return;
if (phys_dev->devno == dev) {
devc = phys_dev;
} else if (phys_dev->isvirtual && virt_dev->devno == dev) {
devc = virt_dev;
} else {
printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
return;
}
devc->mode = 0;
devc->inputintr = NULL;
devc->opened = 0;
}
static int
wf_mpu_out (int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
static int lastoutdev = -1;
unsigned char switchch;
if (phys_dev->isvirtual && lastoutdev != dev) {
if (dev == phys_dev->devno) {
switchch = WF_INTERNAL_SWITCH;
} else if (dev == virt_dev->devno) {
switchch = WF_EXTERNAL_SWITCH;
} else {
printk (KERN_ERR "WF-MPU: bad device number %d", dev);
return (0);
}
/* XXX fix me */
for (timeout = 30000; timeout > 0 && !output_ready ();
timeout--);
spin_lock_irqsave(&lock,flags);
if (!output_ready ()) {
printk (KERN_WARNING "WF-MPU: Send switch "
"byte timeout\n");
spin_unlock_irqrestore(&lock,flags);
return 0;
}
write_data (switchch);
spin_unlock_irqrestore(&lock,flags);
}
lastoutdev = dev;
/*
* Sometimes it takes about 30000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
/* XXX fix me */
for (timeout = 30000; timeout > 0 && !output_ready (); timeout--);
spin_lock_irqsave(&lock,flags);
if (!output_ready ()) {
spin_unlock_irqrestore(&lock,flags);
printk (KERN_WARNING "WF-MPU: Send data timeout\n");
return 0;
}
write_data (midi_byte);
spin_unlock_irqrestore(&lock,flags);
return 1;
}
static inline int wf_mpu_start_read (int dev) {
return 0;
}
static inline int wf_mpu_end_read (int dev) {
return 0;
}
static int wf_mpu_ioctl (int dev, unsigned cmd, void __user *arg)
{
printk (KERN_WARNING
"WF-MPU: Intelligent mode not supported by hardware.\n");
return -(EINVAL);
}
static int wf_mpu_buffer_status (int dev)
{
return 0;
}
static struct synth_operations wf_mpu_synth_operations[2];
static struct midi_operations wf_mpu_midi_operations[2];
static struct midi_operations wf_mpu_midi_proto =
{
.owner = THIS_MODULE,
.info = {"WF-MPU MIDI", 0, MIDI_CAP_MPU401, SNDCARD_MPU401},
.in_info = {0}, /* in_info */
.open = wf_mpu_open,
.close = wf_mpu_close,
.ioctl = wf_mpu_ioctl,
.outputc = wf_mpu_out,
.start_read = wf_mpu_start_read,
.end_read = wf_mpu_end_read,
.buffer_status = wf_mpu_buffer_status,
};
static struct synth_info wf_mpu_synth_info_proto =
{"WaveFront MPU-401 interface", 0,
SYNTH_TYPE_MIDI, MIDI_TYPE_MPU401, 0, 128, 0, 128, SYNTH_CAP_INPUT};
static struct synth_info wf_mpu_synth_info[2];
static int
wf_mpu_synth_ioctl (int dev, unsigned int cmd, void __user *arg)
{
int midi_dev;
int index;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL)
return -(ENXIO);
if (midi_dev == phys_dev->devno) {
index = 0;
} else if (phys_dev->isvirtual && midi_dev == virt_dev->devno) {
index = 1;
} else {
return -(EINVAL);
}
switch (cmd) {
case SNDCTL_SYNTH_INFO:
if (copy_to_user(arg,
&wf_mpu_synth_info[index],
sizeof (struct synth_info)))
return -EFAULT;
return 0;
case SNDCTL_SYNTH_MEMAVL:
return 0x7fffffff;
default:
return -EINVAL;
}
}
static int
wf_mpu_synth_open (int dev, int mode)
{
int midi_dev;
struct wf_mpu_config *devc;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL) {
return -(ENXIO);
}
if (phys_dev->devno == midi_dev) {
devc = phys_dev;
} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
devc = virt_dev;
} else {
printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
return -(EINVAL);
}
if (devc->opened) {
return -(EBUSY);
}
devc->mode = MODE_SYNTH;
devc->synthno = dev;
devc->opened = mode;
devc->inputintr = NULL;
return 0;
}
static void
wf_mpu_synth_close (int dev)
{
int midi_dev;
struct wf_mpu_config *devc;
midi_dev = synth_devs[dev]->midi_dev;
if (phys_dev->devno == midi_dev) {
devc = phys_dev;
} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
devc = virt_dev;
} else {
printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
return;
}
devc->inputintr = NULL;
devc->opened = 0;
devc->mode = 0;
}
#define _MIDI_SYNTH_C_
#define MIDI_SYNTH_NAME "WaveFront (MIDI)"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include "midi_synth.h"
static struct synth_operations wf_mpu_synth_proto =
{
.owner = THIS_MODULE,
.id = "WaveFront (ICS2115)",
.info = NULL, /* info field, filled in during configuration */
.midi_dev = 0, /* MIDI dev XXX should this be -1 ? */
.synth_type = SYNTH_TYPE_MIDI,
.synth_subtype = SAMPLE_TYPE_WAVEFRONT,
.open = wf_mpu_synth_open,
.close = wf_mpu_synth_close,
.ioctl = wf_mpu_synth_ioctl,
.kill_note = midi_synth_kill_note,
.start_note = midi_synth_start_note,
.set_instr = midi_synth_set_instr,
.reset = midi_synth_reset,
.hw_control = midi_synth_hw_control,
.load_patch = midi_synth_load_patch,
.aftertouch = midi_synth_aftertouch,
.controller = midi_synth_controller,
.panning = midi_synth_panning,
.bender = midi_synth_bender,
.setup_voice = midi_synth_setup_voice,
.send_sysex = midi_synth_send_sysex
};
static int
config_wf_mpu (struct wf_mpu_config *dev)
{
int is_external;
char *name;
int index;
if (dev == phys_dev) {
name = "WaveFront internal MIDI";
is_external = 0;
index = 0;
memcpy ((char *) &wf_mpu_synth_operations[index],
(char *) &wf_mpu_synth_proto,
sizeof (struct synth_operations));
} else {
name = "WaveFront external MIDI";
is_external = 1;
index = 1;
/* no synth operations for an external MIDI interface */
}
memcpy ((char *) &wf_mpu_synth_info[dev->devno],
(char *) &wf_mpu_synth_info_proto,
sizeof (struct synth_info));
strcpy (wf_mpu_synth_info[index].name, name);
wf_mpu_synth_operations[index].midi_dev = dev->devno;
wf_mpu_synth_operations[index].info = &wf_mpu_synth_info[index];
memcpy ((char *) &wf_mpu_midi_operations[index],
(char *) &wf_mpu_midi_proto,
sizeof (struct midi_operations));
if (is_external) {
wf_mpu_midi_operations[index].converter = NULL;
} else {
wf_mpu_midi_operations[index].converter =
&wf_mpu_synth_operations[index];
}
strcpy (wf_mpu_midi_operations[index].info.name, name);
midi_devs[dev->devno] = &wf_mpu_midi_operations[index];
midi_devs[dev->devno]->in_info.m_busy = 0;
midi_devs[dev->devno]->in_info.m_state = MST_INIT;
midi_devs[dev->devno]->in_info.m_ptr = 0;
midi_devs[dev->devno]->in_info.m_left = 0;
midi_devs[dev->devno]->in_info.m_prev_status = 0;
devs[index].opened = 0;
devs[index].mode = 0;
return (0);
}
int virtual_midi_enable (void)
{
if ((virt_dev->devno < 0) &&
(virt_dev->devno = sound_alloc_mididev()) == -1) {
printk (KERN_ERR
"WF-MPU: too many midi devices detected\n");
return -1;
}
config_wf_mpu (virt_dev);
phys_dev->isvirtual = 1;
return virt_dev->devno;
}
int
virtual_midi_disable (void)
{
unsigned long flags;
spin_lock_irqsave(&lock,flags);
wf_mpu_close (virt_dev->devno);
/* no synth on virt_dev, so no need to call wf_mpu_synth_close() */
phys_dev->isvirtual = 0;
spin_unlock_irqrestore(&lock,flags);
return 0;
}
int __init detect_wf_mpu (int irq, int io_base)
{
if (!request_region(io_base, 2, "wavefront midi")) {
printk (KERN_WARNING "WF-MPU: I/O port %x already in use.\n",
io_base);
return -1;
}
phys_dev->base = io_base;
phys_dev->irq = irq;
phys_dev->devno = -1;
virt_dev->devno = -1;
return 0;
}
int __init install_wf_mpu (void)
{
if ((phys_dev->devno = sound_alloc_mididev()) < 0){
printk (KERN_ERR "WF-MPU: Too many MIDI devices detected.\n");
release_region(phys_dev->base, 2);
return -1;
}
phys_dev->isvirtual = 0;
if (config_wf_mpu (phys_dev)) {
printk (KERN_WARNING
"WF-MPU: configuration for MIDI device %d failed\n",
phys_dev->devno);
sound_unload_mididev (phys_dev->devno);
}
/* OK, now we're configured to handle an interrupt ... */
if (request_irq (phys_dev->irq, wf_mpuintr, SA_INTERRUPT|SA_SHIRQ,
"wavefront midi", phys_dev) < 0) {
printk (KERN_ERR "WF-MPU: Failed to allocate IRQ%d\n",
phys_dev->irq);
return -1;
}
/* This being a WaveFront (ICS-2115) emulated MPU-401, we have
to switch it into UART (dumb) mode, because otherwise, it
won't do anything at all.
*/
start_uart_mode ();
return phys_dev->devno;
}
void
uninstall_wf_mpu (void)
{
release_region (phys_dev->base, 2);
free_irq (phys_dev->irq, phys_dev);
sound_unload_mididev (phys_dev->devno);
if (virt_dev->devno >= 0) {
sound_unload_mididev (virt_dev->devno);
}
}
static void
start_uart_mode (void)
{
int ok, i;
unsigned long flags;
spin_lock_irqsave(&lock,flags);
/* XXX fix me */
for (i = 0; i < 30000 && !output_ready (); i++);
outb (UART_MODE_ON, COMDPORT(phys_dev));
for (ok = 0, i = 50000; i > 0 && !ok; i--) {
if (input_avail ()) {
if (read_data () == MPU_ACK) {
ok = 1;
}
}
}
spin_unlock_irqrestore(&lock,flags);
}
#endif
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