1 /*
2 * sound/oss/sb_midi.c
3 *
4 * The low level driver for the Sound Blaster DS chips.
5 *
6 *
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
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
11 * for more info.
12 */
13
14 #include <linux/spinlock.h>
15
16 #include "sound_config.h"
17
18 #include "sb.h"
19 #undef SB_TEST_IRQ
20
21 /*
22 * The DSP channel can be used either for input or output. Variable
23 * 'sb_irq_mode' will be set when the program calls read or write first time
24 * after open. Current version doesn't support mode changes without closing
25 * and reopening the device. Support for this feature may be implemented in a
26 * future version of this driver.
27 */
28
29
30 static int sb_midi_open(int dev, int mode,
31 void (*input) (int dev, unsigned char data),
32 void (*output) (int dev)
33 )
34 {
35 sb_devc *devc = midi_devs[dev]->devc;
36 unsigned long flags;
37
38 if (devc == NULL)
39 return -ENXIO;
40
41 spin_lock_irqsave(&devc->lock, flags);
42 if (devc->opened)
43 {
44 spin_unlock_irqrestore(&devc->lock, flags);
45 return -EBUSY;
46 }
47 devc->opened = 1;
48 spin_unlock_irqrestore(&devc->lock, flags);
49
50 devc->irq_mode = IMODE_MIDI;
51 devc->midi_broken = 0;
52
53 sb_dsp_reset(devc);
54
55 if (!sb_dsp_command(devc, 0x35)) /* Start MIDI UART mode */
56 {
57 devc->opened = 0;
58 return -EIO;
59 }
60 devc->intr_active = 1;
61
62 if (mode & OPEN_READ)
63 {
64 devc->input_opened = 1;
65 devc->midi_input_intr = input;
66 }
67 return 0;
68 }
69
70 static void sb_midi_close(int dev)
71 {
72 sb_devc *devc = midi_devs[dev]->devc;
73 unsigned long flags;
74
75 if (devc == NULL)
76 return;
77
78 spin_lock_irqsave(&devc->lock, flags);
79 sb_dsp_reset(devc);
80 devc->intr_active = 0;
81 devc->input_opened = 0;
82 devc->opened = 0;
83 spin_unlock_irqrestore(&devc->lock, flags);
84 }
85
86 static int sb_midi_out(int dev, unsigned char midi_byte)
87 {
88 sb_devc *devc = midi_devs[dev]->devc;
89
90 if (devc == NULL)
91 return 1;
92
93 if (devc->midi_broken)
94 return 1;
95
96 if (!sb_dsp_command(devc, midi_byte))
97 {
98 devc->midi_broken = 1;
99 return 1;
100 }
101 return 1;
102 }
103
104 static int sb_midi_start_read(int dev)
105 {
106 return 0;
107 }
108
109 static int sb_midi_end_read(int dev)
110 {
111 sb_devc *devc = midi_devs[dev]->devc;
112
113 if (devc == NULL)
114 return -ENXIO;
115
116 sb_dsp_reset(devc);
117 devc->intr_active = 0;
118 return 0;
119 }
120
121 static int sb_midi_ioctl(int dev, unsigned cmd, void __user *arg)
122 {
123 return -EINVAL;
124 }
125
126 void sb_midi_interrupt(sb_devc * devc)
127 {
128 unsigned long flags;
129 unsigned char data;
130
131 if (devc == NULL)
132 return;
133
134 spin_lock_irqsave(&devc->lock, flags);
135
136 data = inb(DSP_READ);
137 if (devc->input_opened)
138 devc->midi_input_intr(devc->my_mididev, data);
139
140 spin_unlock_irqrestore(&devc->lock, flags);
141 }
142
143 #define MIDI_SYNTH_NAME "Sound Blaster Midi"
144 #define MIDI_SYNTH_CAPS 0
145 #include "midi_synth.h"
146
147 static struct midi_operations sb_midi_operations =
148 {
149 .owner = THIS_MODULE,
150 .info = {"Sound Blaster", 0, 0, SNDCARD_SB},
151 .converter = &std_midi_synth,
152 .in_info = {0},
153 .open = sb_midi_open,
154 .close = sb_midi_close,
155 .ioctl = sb_midi_ioctl,
156 .outputc = sb_midi_out,
157 .start_read = sb_midi_start_read,
158 .end_read = sb_midi_end_read,
159 };
160
161 void sb_dsp_midi_init(sb_devc * devc, struct module *owner)
162 {
163 int dev;
164
165 if (devc->model < 2) /* No MIDI support for SB 1.x */
166 return;
167
168 dev = sound_alloc_mididev();
169
170 if (dev == -1)
171 {
172 printk(KERN_ERR "sb_midi: too many MIDI devices detected\n");
173 return;
174 }
175 std_midi_synth.midi_dev = devc->my_mididev = dev;
176 midi_devs[dev] = kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
177 if (midi_devs[dev] == NULL)
178 {
179 printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
180 sound_unload_mididev(dev);
181 return;
182 }
183 memcpy((char *) midi_devs[dev], (char *) &sb_midi_operations,
184 sizeof(struct midi_operations));
185
186 if (owner)
187 midi_devs[dev]->owner = owner;
188
189 midi_devs[dev]->devc = devc;
190
191
192 midi_devs[dev]->converter = kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
193 if (midi_devs[dev]->converter == NULL)
194 {
195 printk(KERN_WARNING "Sound Blaster: failed to allocate MIDI memory.\n");
196 kfree(midi_devs[dev]);
197 sound_unload_mididev(dev);
198 return;
199 }
200 memcpy((char *) midi_devs[dev]->converter, (char *) &std_midi_synth,
201 sizeof(struct synth_operations));
202
203 midi_devs[dev]->converter->id = "SBMIDI";
204 sequencer_init();
205 }
206
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