2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3 * Routines for control of SoundBlaster cards - MIDI interface
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.
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.
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
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
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.
29 #include <sound/driver.h>
31 #include <linux/time.h>
32 #include <sound/core.h>
39 irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb * chip)
41 struct snd_rawmidi *rmidi;
45 if (chip == NULL || (rmidi = chip->rmidi) == NULL) {
46 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
49 spin_lock(&chip->midi_input_lock);
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);
58 spin_unlock(&chip->midi_input_lock);
66 static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
70 unsigned int valid_open_flags;
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);
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);
88 spin_unlock_irqrestore(&chip->open_lock, flags);
93 static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
97 unsigned int valid_open_flags;
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);
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);
115 spin_unlock_irqrestore(&chip->open_lock, flags);
120 static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
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 */
133 spin_unlock_irqrestore(&chip->open_lock, flags);
138 static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
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 */
151 spin_unlock_irqrestore(&chip->open_lock, flags);
156 static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
161 chip = substream->rmidi->private_data;
162 spin_lock_irqsave(&chip->open_lock, flags);
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;
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;
176 spin_unlock_irqrestore(&chip->open_lock, flags);
179 static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
186 /* how big is Tx FIFO? */
187 chip = substream->rmidi->private_data;
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);
196 if (chip->hardware >= SB_HW_20) {
198 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
201 /* Tx FIFO full - try again later */
202 spin_unlock_irqrestore(&chip->open_lock, flags);
205 outb(byte, SBP(chip, WRITE));
207 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
208 snd_sbdsp_command(chip, byte);
210 snd_rawmidi_transmit_ack(substream, 1);
211 spin_unlock_irqrestore(&chip->open_lock, flags);
215 static void snd_sb8dsp_midi_output_timer(unsigned long data)
217 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;
218 struct snd_sb * chip = substream->rmidi->private_data;
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);
228 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
233 chip = substream->rmidi->private_data;
234 spin_lock_irqsave(&chip->open_lock, flags);
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;
245 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
246 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
249 spin_unlock_irqrestore(&chip->open_lock, flags);
252 snd_sb8dsp_midi_output_write(substream);
259 static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
261 .open = snd_sb8dsp_midi_output_open,
262 .close = snd_sb8dsp_midi_output_close,
263 .trigger = snd_sb8dsp_midi_output_trigger,
266 static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
268 .open = snd_sb8dsp_midi_input_open,
269 .close = snd_sb8dsp_midi_input_close,
270 .trigger = snd_sb8dsp_midi_input_trigger,
273 int snd_sb8dsp_midi(struct snd_sb *chip, int device, struct snd_rawmidi ** rrawmidi)
275 struct snd_rawmidi *rmidi;
280 if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
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;