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 <linux/spinlock.h>
20 #include "sound_config.h"
25 static int midi_busy, input_opened;
27 static int output_used;
28 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;
37 extern spinlock_t gus_lock;
39 static int GUS_MIDI_STATUS(void)
41 return inb(u_MidiStatus);
44 static int gus_midi_open(int dev, int mode, void (*input) (int dev, unsigned char data), void (*output) (int dev))
48 /* printk("GUS: Midi busy\n");*/
51 outb((MIDI_RESET), u_MidiControl);
57 if (mode == OPEN_READ || mode == OPEN_READWRITE)
60 gus_midi_control |= MIDI_ENABLE_RCV;
63 outb((gus_midi_control), u_MidiControl); /* Enable */
66 qlen = qhead = qtail = output_used = 0;
67 midi_input_intr = input;
72 static int dump_to_midi(unsigned char midi_byte)
79 spin_lock_irqsave(&gus_lock, flags);
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);
95 spin_unlock_irqrestore(&gus_lock,flags);
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
116 spin_lock_irqsave(&gus_lock, flags);
118 while (qlen && dump_to_midi(tmp_queue[qhead]))
123 spin_unlock_irqrestore(&gus_lock,flags);
126 * Output the byte if the local queue is empty.
130 if (dump_to_midi(midi_byte))
136 * Put to the local queue
143 spin_lock_irqsave(&gus_lock, flags);
145 tmp_queue[qtail] = midi_byte;
149 spin_unlock_irqrestore(&gus_lock,flags);
153 static int gus_midi_start_read(int dev)
158 static int gus_midi_end_read(int dev)
163 static void gus_midi_kick(int dev)
167 static int gus_midi_buffer_status(int dev)
174 spin_lock_irqsave(&gus_lock, flags);
176 if (qlen && dump_to_midi(tmp_queue[qhead]))
181 spin_unlock_irqrestore(&gus_lock,flags);
182 return (qlen > 0) || !(GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY);
185 #define MIDI_SYNTH_NAME "Gravis Ultrasound Midi"
186 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
187 #include "midi_synth.h"
189 static struct midi_operations gus_midi_operations =
191 .owner = THIS_MODULE,
192 .info = {"Gravis UltraSound Midi", 0, 0, SNDCARD_GUS},
193 .converter = &std_midi_synth,
195 .open = gus_midi_open,
196 .close = gus_midi_close,
197 .outputc = gus_midi_out,
198 .start_read = gus_midi_start_read,
199 .end_read = gus_midi_end_read,
200 .kick = gus_midi_kick,
201 .buffer_status = gus_midi_buffer_status,
204 void __init gus_midi_init(struct address_info *hw_config)
206 int dev = sound_alloc_mididev();
210 printk(KERN_INFO "gus_midi: Too many midi devices detected\n");
213 outb((MIDI_RESET), u_MidiControl);
215 std_midi_synth.midi_dev = my_dev = dev;
216 hw_config->slots[2] = dev;
217 midi_devs[dev] = &gus_midi_operations;
222 void gus_midi_interrupt(int dummy)
224 volatile unsigned char stat, data;
227 spin_lock(&gus_lock);
229 while (timeout-- > 0 && (stat = GUS_MIDI_STATUS()) & (MIDI_RCV_FULL | MIDI_XMIT_EMPTY))
231 if (stat & MIDI_RCV_FULL)
233 data = inb(u_MidiData);
235 midi_input_intr(my_dev, data);
237 if (stat & MIDI_XMIT_EMPTY)
239 while (qlen && dump_to_midi(tmp_queue[qhead]))
247 * Disable Midi output interrupts, since no data in the buffer
249 gus_midi_control &= ~MIDI_ENABLE_XMIT;
250 outb((gus_midi_control), u_MidiControl);
251 outb((gus_midi_control), u_MidiControl);
255 spin_unlock(&gus_lock);