4 * The low level driver for the GUS Midi Interface.
7 * Copyright (C) by Hannu Savolainen 1993-1997
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
14 * 11-10-2000 Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
15 * Added __init to gus_midi_init()
18 #include "linux/init.h"
19 #include "sound_config.h"
24 static int midi_busy
= 0, input_opened
= 0;
26 static int output_used
= 0;
27 static volatile unsigned char gus_midi_control
;
29 static void (*midi_input_intr
) (int dev
, unsigned char data
);
31 static unsigned char tmp_queue
[256];
32 extern int gus_pnp_flag
;
33 static volatile int qlen
;
34 static volatile unsigned char qhead
, qtail
;
35 extern int gus_base
, gus_irq
, gus_dma
;
38 static int GUS_MIDI_STATUS(void)
40 return inb(u_MidiStatus
);
43 static int gus_midi_open(int dev
, int mode
, void (*input
) (int dev
, unsigned char data
), void (*output
) (int dev
))
47 /* printk("GUS: Midi busy\n");*/
50 outb((MIDI_RESET
), u_MidiControl
);
56 if (mode
== OPEN_READ
|| mode
== OPEN_READWRITE
)
59 gus_midi_control
|= MIDI_ENABLE_RCV
;
62 outb((gus_midi_control
), u_MidiControl
); /* Enable */
65 qlen
= qhead
= qtail
= output_used
= 0;
66 midi_input_intr
= input
;
71 static int dump_to_midi(unsigned char midi_byte
)
81 if (GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY
)
84 outb((midi_byte
), u_MidiData
);
89 * Enable Midi xmit interrupts (again)
91 gus_midi_control
|= MIDI_ENABLE_XMIT
;
92 outb((gus_midi_control
), u_MidiControl
);
99 static void gus_midi_close(int dev
)
102 * Reset FIFO pointers, disable intrs
105 outb((MIDI_RESET
), u_MidiControl
);
109 static int gus_midi_out(int dev
, unsigned char midi_byte
)
114 * Drain the local queue first
120 while (qlen
&& dump_to_midi(tmp_queue
[qhead
]))
125 restore_flags(flags
);
128 * Output the byte if the local queue is empty.
132 if (dump_to_midi(midi_byte
))
138 * Put to the local queue
148 tmp_queue
[qtail
] = midi_byte
;
152 restore_flags(flags
);
156 static int gus_midi_start_read(int dev
)
161 static int gus_midi_end_read(int dev
)
166 static void gus_midi_kick(int dev
)
170 static int gus_midi_buffer_status(int dev
)
180 if (qlen
&& dump_to_midi(tmp_queue
[qhead
]))
185 restore_flags(flags
);
186 return (qlen
> 0) | !(GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY
);
189 #define MIDI_SYNTH_NAME "Gravis Ultrasound Midi"
190 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
191 #include "midi_synth.h"
193 static struct midi_operations gus_midi_operations
=
196 info
: {"Gravis UltraSound Midi", 0, 0, SNDCARD_GUS
},
197 converter
: &std_midi_synth
,
200 close
: gus_midi_close
,
201 outputc
: gus_midi_out
,
202 start_read
: gus_midi_start_read
,
203 end_read
: gus_midi_end_read
,
205 buffer_status
: gus_midi_buffer_status
,
208 void __init
gus_midi_init(struct address_info
*hw_config
)
210 int dev
= sound_alloc_mididev();
214 printk(KERN_INFO
"gus_midi: Too many midi devices detected\n");
217 outb((MIDI_RESET
), u_MidiControl
);
219 std_midi_synth
.midi_dev
= my_dev
= dev
;
220 hw_config
->slots
[2] = dev
;
221 midi_devs
[dev
] = &gus_midi_operations
;
226 void gus_midi_interrupt(int dummy
)
228 volatile unsigned char stat
, data
;
235 while (timeout
-- > 0 && (stat
= GUS_MIDI_STATUS()) & (MIDI_RCV_FULL
| MIDI_XMIT_EMPTY
))
237 if (stat
& MIDI_RCV_FULL
)
239 data
= inb(u_MidiData
);
241 midi_input_intr(my_dev
, data
);
243 if (stat
& MIDI_XMIT_EMPTY
)
245 while (qlen
&& dump_to_midi(tmp_queue
[qhead
]))
253 * Disable Midi output interrupts, since no data in the buffer
255 gus_midi_control
&= ~MIDI_ENABLE_XMIT
;
256 outb((gus_midi_control
), u_MidiControl
);
257 outb((gus_midi_control
), u_MidiControl
);
261 restore_flags(flags
);