Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / sound / isa / sb / sb8_midi.c
blob0b67edd7ac6edbb1bce8244535881b303b18be54
1 /*
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
19 * --
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.
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>
30 #include <asm/io.h>
31 #include <linux/time.h>
32 #include <sound/core.h>
33 #include <sound/sb.h>
36 irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
38 struct snd_rawmidi *rmidi;
39 int max = 64;
40 char byte;
42 if (!chip)
43 return IRQ_NONE;
45 rmidi = chip->rmidi;
46 if (!rmidi) {
47 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
48 return IRQ_NONE;
51 spin_lock(&chip->midi_input_lock);
52 while (max-- > 0) {
53 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
54 byte = inb(SBP(chip, READ));
55 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
56 snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
60 spin_unlock(&chip->midi_input_lock);
61 return IRQ_HANDLED;
64 static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
66 unsigned long flags;
67 struct snd_sb *chip;
68 unsigned int valid_open_flags;
70 chip = substream->rmidi->private_data;
71 valid_open_flags = chip->hardware >= SB_HW_20
72 ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
73 spin_lock_irqsave(&chip->open_lock, flags);
74 if (chip->open & ~valid_open_flags) {
75 spin_unlock_irqrestore(&chip->open_lock, flags);
76 return -EAGAIN;
78 chip->open |= SB_OPEN_MIDI_INPUT;
79 chip->midi_substream_input = substream;
80 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
81 spin_unlock_irqrestore(&chip->open_lock, flags);
82 snd_sbdsp_reset(chip); /* reset DSP */
83 if (chip->hardware >= SB_HW_20)
84 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
85 } else {
86 spin_unlock_irqrestore(&chip->open_lock, flags);
88 return 0;
91 static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
93 unsigned long flags;
94 struct snd_sb *chip;
95 unsigned int valid_open_flags;
97 chip = substream->rmidi->private_data;
98 valid_open_flags = chip->hardware >= SB_HW_20
99 ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
100 spin_lock_irqsave(&chip->open_lock, flags);
101 if (chip->open & ~valid_open_flags) {
102 spin_unlock_irqrestore(&chip->open_lock, flags);
103 return -EAGAIN;
105 chip->open |= SB_OPEN_MIDI_OUTPUT;
106 chip->midi_substream_output = substream;
107 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
108 spin_unlock_irqrestore(&chip->open_lock, flags);
109 snd_sbdsp_reset(chip); /* reset DSP */
110 if (chip->hardware >= SB_HW_20)
111 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
112 } else {
113 spin_unlock_irqrestore(&chip->open_lock, flags);
115 return 0;
118 static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
120 unsigned long flags;
121 struct snd_sb *chip;
123 chip = substream->rmidi->private_data;
124 spin_lock_irqsave(&chip->open_lock, flags);
125 chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
126 chip->midi_substream_input = NULL;
127 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
128 spin_unlock_irqrestore(&chip->open_lock, flags);
129 snd_sbdsp_reset(chip); /* reset DSP */
130 } else {
131 spin_unlock_irqrestore(&chip->open_lock, flags);
133 return 0;
136 static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
138 unsigned long flags;
139 struct snd_sb *chip;
141 chip = substream->rmidi->private_data;
142 spin_lock_irqsave(&chip->open_lock, flags);
143 chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
144 chip->midi_substream_output = NULL;
145 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
146 spin_unlock_irqrestore(&chip->open_lock, flags);
147 snd_sbdsp_reset(chip); /* reset DSP */
148 } else {
149 spin_unlock_irqrestore(&chip->open_lock, flags);
151 return 0;
154 static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
156 unsigned long flags;
157 struct snd_sb *chip;
159 chip = substream->rmidi->private_data;
160 spin_lock_irqsave(&chip->open_lock, flags);
161 if (up) {
162 if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
163 if (chip->hardware < SB_HW_20)
164 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
165 chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
167 } else {
168 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
169 if (chip->hardware < SB_HW_20)
170 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
171 chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
174 spin_unlock_irqrestore(&chip->open_lock, flags);
177 static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
179 unsigned long flags;
180 struct snd_sb *chip;
181 char byte;
182 int max = 32;
184 /* how big is Tx FIFO? */
185 chip = substream->rmidi->private_data;
186 while (max-- > 0) {
187 spin_lock_irqsave(&chip->open_lock, flags);
188 if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
189 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
190 del_timer(&chip->midi_timer);
191 spin_unlock_irqrestore(&chip->open_lock, flags);
192 break;
194 if (chip->hardware >= SB_HW_20) {
195 int timeout = 8;
196 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
198 if (timeout == 0) {
199 /* Tx FIFO full - try again later */
200 spin_unlock_irqrestore(&chip->open_lock, flags);
201 break;
203 outb(byte, SBP(chip, WRITE));
204 } else {
205 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
206 snd_sbdsp_command(chip, byte);
208 snd_rawmidi_transmit_ack(substream, 1);
209 spin_unlock_irqrestore(&chip->open_lock, flags);
213 static void snd_sb8dsp_midi_output_timer(unsigned long data)
215 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;
216 struct snd_sb * chip = substream->rmidi->private_data;
217 unsigned long flags;
219 spin_lock_irqsave(&chip->open_lock, flags);
220 chip->midi_timer.expires = 1 + jiffies;
221 add_timer(&chip->midi_timer);
222 spin_unlock_irqrestore(&chip->open_lock, flags);
223 snd_sb8dsp_midi_output_write(substream);
226 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
228 unsigned long flags;
229 struct snd_sb *chip;
231 chip = substream->rmidi->private_data;
232 spin_lock_irqsave(&chip->open_lock, flags);
233 if (up) {
234 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
235 init_timer(&chip->midi_timer);
236 chip->midi_timer.function = snd_sb8dsp_midi_output_timer;
237 chip->midi_timer.data = (unsigned long) substream;
238 chip->midi_timer.expires = 1 + jiffies;
239 add_timer(&chip->midi_timer);
240 chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
242 } else {
243 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
244 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
247 spin_unlock_irqrestore(&chip->open_lock, flags);
249 if (up)
250 snd_sb8dsp_midi_output_write(substream);
253 static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
255 .open = snd_sb8dsp_midi_output_open,
256 .close = snd_sb8dsp_midi_output_close,
257 .trigger = snd_sb8dsp_midi_output_trigger,
260 static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
262 .open = snd_sb8dsp_midi_input_open,
263 .close = snd_sb8dsp_midi_input_close,
264 .trigger = snd_sb8dsp_midi_input_trigger,
267 int snd_sb8dsp_midi(struct snd_sb *chip, int device, struct snd_rawmidi ** rrawmidi)
269 struct snd_rawmidi *rmidi;
270 int err;
272 if (rrawmidi)
273 *rrawmidi = NULL;
274 if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
275 return err;
276 strcpy(rmidi->name, "SB8 MIDI");
277 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
278 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
279 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
280 if (chip->hardware >= SB_HW_20)
281 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
282 rmidi->private_data = chip;
283 chip->rmidi = rmidi;
284 if (rrawmidi)
285 *rrawmidi = rmidi;
286 return 0;