1 files changed, 205 insertions, 0 deletions

diff --git a/sound/oss/sb_midi.c b/sound/oss/sb_midi.c
new file mode 100644
index 000000000000..ed3bd0640ffd
--- /dev/null
+++ b/sound/oss/sb_midi.c
@@ -0,0 +1,205 @@
+/*
+ * sound/sb_dsp.c
+ *
+ * The low level driver for the Sound Blaster DS chips.
+ *
+ *
+ * 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.
+ */
+
+#include <linux/spinlock.h>
+
+#include "sound_config.h"
+
+#include "sb.h"
+#undef SB_TEST_IRQ
+
+/*
+ * The DSP channel can be used either for input or output. Variable
+ * 'sb_irq_mode' will be set when the program calls read or write first time
+ * after open. Current version doesn't support mode changes without closing
+ * and reopening the device. Support for this feature may be implemented in a
+ * future version of this driver.
+ */
+
+
+static int sb_midi_open(int dev, int mode,
+             void            (*input) (int dev, unsigned char data),
+             void            (*output) (int dev)
+)
+{
+        sb_devc *devc = midi_devs[dev]->devc;
+        unsigned long flags;
+
+        if (devc == NULL)
+                return -ENXIO;
+
+        spin_lock_irqsave(&devc->lock, flags);
+        if (devc->opened)
+        {
+                spin_unlock_irqrestore(&devc->lock, flags);
+                return -EBUSY;
+        }
+        devc->opened = 1;
+        spin_unlock_irqrestore(&devc->lock, flags);
+
+        devc->irq_mode = IMODE_MIDI;
+        devc->midi_broken = 0;
+
+        sb_dsp_reset(devc);
+
+        if (!sb_dsp_command(devc, 0x35))        /* Start MIDI UART mode */
+        {
+                  devc->opened = 0;
+                  return -EIO;
+        }
+        devc->intr_active = 1;
+
+        if (mode & OPEN_READ)
+        {
+                devc->input_opened = 1;
+                devc->midi_input_intr = input;
+        }
+        return 0;
+}
+
+static void sb_midi_close(int dev)
+{
+        sb_devc *devc = midi_devs[dev]->devc;
+        unsigned long flags;
+
+        if (devc == NULL)
+                return;
+
+        spin_lock_irqsave(&devc->lock, flags);
+        sb_dsp_reset(devc);
+        devc->intr_active = 0;
+        devc->input_opened = 0;
+        devc->opened = 0;
+        spin_unlock_irqrestore(&devc->lock, flags);
+}
+
+static int sb_midi_out(int dev, unsigned char midi_byte)
+{
+        sb_devc *devc = midi_devs[dev]->devc;
+
+        if (devc == NULL)
+                return 1;
+
+        if (devc->midi_broken)
+                return 1;
+
+        if (!sb_dsp_command(devc, midi_byte))
+        {
+                devc->midi_broken = 1;
+                return 1;
+        }
+        return 1;
+}
+
+static int sb_midi_start_read(int dev)
+{
+        return 0;
+}
+
+static int sb_midi_end_read(int dev)
+{
+        sb_devc *devc = midi_devs[dev]->devc;
+
+        if (devc == NULL)
+                return -ENXIO;
+
+        sb_dsp_reset(devc);
+        devc->intr_active = 0;
+        return 0;
+}
+
+static int sb_midi_ioctl(int dev, unsigned cmd, void __user *arg)
+{
+        return -EINVAL;
+}
+
+void sb_midi_interrupt(sb_devc * devc)
+{
+        unsigned long   flags;
+        unsigned char   data;
+
+        if (devc == NULL)
+                return;
+
+        spin_lock_irqsave(&devc->lock, flags);
+
+        data = inb(DSP_READ);
+        if (devc->input_opened)
+                devc->midi_input_intr(devc->my_mididev, data);
+
+        spin_unlock_irqrestore(&devc->lock, flags);
+}
+
+#define MIDI_SYNTH_NAME "Sound Blaster Midi"
+#define MIDI_SYNTH_CAPS 0
+#include "midi_synth.h"
+
+static struct midi_operations sb_midi_operations =
+{
+        .owner          = THIS_MODULE,
+        .info           = {"Sound Blaster", 0, 0, SNDCARD_SB},
+        .converter      = &std_midi_synth,
+        .in_info        = {0},
+        .open           = sb_midi_open,
+        .close          = sb_midi_close,
+        .ioctl          = sb_midi_ioctl,
+        .outputc        = sb_midi_out,
+        .start_read     = sb_midi_start_read,
+        .end_read       = sb_midi_end_read,
+};
+
+void sb_dsp_midi_init(sb_devc * devc, struct module *owner)
+{
+        int dev;
+
+        if (devc->model < 2)    /* No MIDI support for SB 1.x */
+                return;
+
+        dev = sound_alloc_mididev();
+
+        if (dev == -1)
+        {
+                printk(KERN_ERR "sb_midi: too many MIDI devices detected\n");
+                return;
+        }
+        std_midi_synth.midi_dev = devc->my_mididev = dev;
+        midi_devs[dev] = (struct midi_operations *)kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
+        if (midi_devs[dev] == NULL)
+        {
+                printk(KERN_WARNING "Sound Blaster:  failed to allocate MIDI memory.\n");
+                sound_unload_mididev(dev);
+                  return;
+        }
+        memcpy((char *) midi_devs[dev], (char *) &sb_midi_operations,
+               sizeof(struct midi_operations));
+
+        if (owner)
+                        midi_devs[dev]->owner = owner;
+        
+        midi_devs[dev]->devc = devc;
+
+
+        midi_devs[dev]->converter = (struct synth_operations *)kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
+        if (midi_devs[dev]->converter == NULL)
+        {
+                  printk(KERN_WARNING "Sound Blaster:  failed to allocate MIDI memory.\n");
+                  kfree(midi_devs[dev]);
+                  sound_unload_mididev(dev);
+                  return;
+        }
+        memcpy((char *) midi_devs[dev]->converter, (char *) &std_midi_synth,
+               sizeof(struct synth_operations));
+
+        midi_devs[dev]->converter->id = "SBMIDI";
+        sequencer_init();
+}