aboutsummaryrefslogtreecommitdiffstats
path: root/sound/isa/sb/sb8_midi.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/isa/sb/sb8_midi.c')
-rw-r--r--sound/isa/sb/sb8_midi.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/sound/isa/sb/sb8_midi.c b/sound/isa/sb/sb8_midi.c
new file mode 100644
index 000000000000..d2c633a40e74
--- /dev/null
+++ b/sound/isa/sb/sb8_midi.c
@@ -0,0 +1,293 @@
1/*
2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3 * Routines for control of SoundBlaster cards - MIDI interface
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * --
20 *
21 * Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
22 * Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
23 * working.
24 *
25 * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
26 * Added full duplex UART mode for DSP version 2.0 and later.
27 */
28
29#include <sound/driver.h>
30#include <asm/io.h>
31#include <linux/time.h>
32#include <sound/core.h>
33#include <sound/sb.h>
34
35/*
36
37 */
38
39irqreturn_t snd_sb8dsp_midi_interrupt(sb_t * chip)
40{
41 snd_rawmidi_t *rmidi;
42 int max = 64;
43 char byte;
44
45 if (chip == NULL || (rmidi = chip->rmidi) == NULL) {
46 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
47 return IRQ_NONE;
48 }
49 spin_lock(&chip->midi_input_lock);
50 while (max-- > 0) {
51 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
52 byte = inb(SBP(chip, READ));
53 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
54 snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
55 }
56 }
57 }
58 spin_unlock(&chip->midi_input_lock);
59 return IRQ_HANDLED;
60}
61
62/*
63
64 */
65
66static int snd_sb8dsp_midi_input_open(snd_rawmidi_substream_t * substream)
67{
68 unsigned long flags;
69 sb_t *chip;
70 unsigned int valid_open_flags;
71
72 chip = substream->rmidi->private_data;
73 valid_open_flags = chip->hardware >= SB_HW_20
74 ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
75 spin_lock_irqsave(&chip->open_lock, flags);
76 if (chip->open & ~valid_open_flags) {
77 spin_unlock_irqrestore(&chip->open_lock, flags);
78 return -EAGAIN;
79 }
80 chip->open |= SB_OPEN_MIDI_INPUT;
81 chip->midi_substream_input = substream;
82 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
83 spin_unlock_irqrestore(&chip->open_lock, flags);
84 snd_sbdsp_reset(chip); /* reset DSP */
85 if (chip->hardware >= SB_HW_20)
86 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
87 } else {
88 spin_unlock_irqrestore(&chip->open_lock, flags);
89 }
90 return 0;
91}
92
93static int snd_sb8dsp_midi_output_open(snd_rawmidi_substream_t * substream)
94{
95 unsigned long flags;
96 sb_t *chip;
97 unsigned int valid_open_flags;
98
99 chip = substream->rmidi->private_data;
100 valid_open_flags = chip->hardware >= SB_HW_20
101 ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
102 spin_lock_irqsave(&chip->open_lock, flags);
103 if (chip->open & ~valid_open_flags) {
104 spin_unlock_irqrestore(&chip->open_lock, flags);
105 return -EAGAIN;
106 }
107 chip->open |= SB_OPEN_MIDI_OUTPUT;
108 chip->midi_substream_output = substream;
109 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
110 spin_unlock_irqrestore(&chip->open_lock, flags);
111 snd_sbdsp_reset(chip); /* reset DSP */
112 if (chip->hardware >= SB_HW_20)
113 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
114 } else {
115 spin_unlock_irqrestore(&chip->open_lock, flags);
116 }
117 return 0;
118}
119
120static int snd_sb8dsp_midi_input_close(snd_rawmidi_substream_t * substream)
121{
122 unsigned long flags;
123 sb_t *chip;
124
125 chip = substream->rmidi->private_data;
126 spin_lock_irqsave(&chip->open_lock, flags);
127 chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
128 chip->midi_substream_input = NULL;
129 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
130 spin_unlock_irqrestore(&chip->open_lock, flags);
131 snd_sbdsp_reset(chip); /* reset DSP */
132 } else {
133 spin_unlock_irqrestore(&chip->open_lock, flags);
134 }
135 return 0;
136}
137
138static int snd_sb8dsp_midi_output_close(snd_rawmidi_substream_t * substream)
139{
140 unsigned long flags;
141 sb_t *chip;
142
143 chip = substream->rmidi->private_data;
144 spin_lock_irqsave(&chip->open_lock, flags);
145 chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
146 chip->midi_substream_output = NULL;
147 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
148 spin_unlock_irqrestore(&chip->open_lock, flags);
149 snd_sbdsp_reset(chip); /* reset DSP */
150 } else {
151 spin_unlock_irqrestore(&chip->open_lock, flags);
152 }
153 return 0;
154}
155
156static void snd_sb8dsp_midi_input_trigger(snd_rawmidi_substream_t * substream, int up)
157{
158 unsigned long flags;
159 sb_t *chip;
160
161 chip = substream->rmidi->private_data;
162 spin_lock_irqsave(&chip->open_lock, flags);
163 if (up) {
164 if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
165 if (chip->hardware < SB_HW_20)
166 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
167 chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
168 }
169 } else {
170 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
171 if (chip->hardware < SB_HW_20)
172 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
173 chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
174 }
175 }
176 spin_unlock_irqrestore(&chip->open_lock, flags);
177}
178
179static void snd_sb8dsp_midi_output_write(snd_rawmidi_substream_t * substream)
180{
181 unsigned long flags;
182 sb_t *chip;
183 char byte;
184 int max = 32;
185
186 /* how big is Tx FIFO? */
187 chip = substream->rmidi->private_data;
188 while (max-- > 0) {
189 spin_lock_irqsave(&chip->open_lock, flags);
190 if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
191 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
192 del_timer(&chip->midi_timer);
193 spin_unlock_irqrestore(&chip->open_lock, flags);
194 break;
195 }
196 if (chip->hardware >= SB_HW_20) {
197 int timeout = 8;
198 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
199 ;
200 if (timeout == 0) {
201 /* Tx FIFO full - try again later */
202 spin_unlock_irqrestore(&chip->open_lock, flags);
203 break;
204 }
205 outb(byte, SBP(chip, WRITE));
206 } else {
207 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
208 snd_sbdsp_command(chip, byte);
209 }
210 snd_rawmidi_transmit_ack(substream, 1);
211 spin_unlock_irqrestore(&chip->open_lock, flags);
212 }
213}
214
215static void snd_sb8dsp_midi_output_timer(unsigned long data)
216{
217 snd_rawmidi_substream_t * substream = (snd_rawmidi_substream_t *) data;
218 sb_t * chip = substream->rmidi->private_data;
219 unsigned long flags;
220
221 spin_lock_irqsave(&chip->open_lock, flags);
222 chip->midi_timer.expires = 1 + jiffies;
223 add_timer(&chip->midi_timer);
224 spin_unlock_irqrestore(&chip->open_lock, flags);
225 snd_sb8dsp_midi_output_write(substream);
226}
227
228static void snd_sb8dsp_midi_output_trigger(snd_rawmidi_substream_t * substream, int up)
229{
230 unsigned long flags;
231 sb_t *chip;
232
233 chip = substream->rmidi->private_data;
234 spin_lock_irqsave(&chip->open_lock, flags);
235 if (up) {
236 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
237 init_timer(&chip->midi_timer);
238 chip->midi_timer.function = snd_sb8dsp_midi_output_timer;
239 chip->midi_timer.data = (unsigned long) substream;
240 chip->midi_timer.expires = 1 + jiffies;
241 add_timer(&chip->midi_timer);
242 chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
243 }
244 } else {
245 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
246 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
247 }
248 }
249 spin_unlock_irqrestore(&chip->open_lock, flags);
250
251 if (up)
252 snd_sb8dsp_midi_output_write(substream);
253}
254
255/*
256
257 */
258
259static snd_rawmidi_ops_t snd_sb8dsp_midi_output =
260{
261 .open = snd_sb8dsp_midi_output_open,
262 .close = snd_sb8dsp_midi_output_close,
263 .trigger = snd_sb8dsp_midi_output_trigger,
264};
265
266static snd_rawmidi_ops_t snd_sb8dsp_midi_input =
267{
268 .open = snd_sb8dsp_midi_input_open,
269 .close = snd_sb8dsp_midi_input_close,
270 .trigger = snd_sb8dsp_midi_input_trigger,
271};
272
273int snd_sb8dsp_midi(sb_t *chip, int device, snd_rawmidi_t ** rrawmidi)
274{
275 snd_rawmidi_t *rmidi;
276 int err;
277
278 if (rrawmidi)
279 *rrawmidi = NULL;
280 if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
281 return err;
282 strcpy(rmidi->name, "SB8 MIDI");
283 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
284 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
285 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
286 if (chip->hardware >= SB_HW_20)
287 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
288 rmidi->private_data = chip;
289 chip->rmidi = rmidi;
290 if (rrawmidi)
291 *rrawmidi = rmidi;
292 return 0;
293}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-16 18:52:09 -0500