1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <asm/io.h>
30 #include <linux/time.h>
31 #include <sound/core.h>
32 #include <sound/sb.h>
33
34
35 irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
36 {
37 struct snd_rawmidi *rmidi;
38 int max = 64;
39 char byte;
40
41 if (!chip)
42 return IRQ_NONE;
43
44 rmidi = chip->rmidi;
45 if (!rmidi) {
46 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
47 return IRQ_NONE;
48 }
49
50 spin_lock(&chip->midi_input_lock);
51 while (max-- > 0) {
52 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
53 byte = inb(SBP(chip, READ));
54 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
55 snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
56 }
57 }
58 }
59 spin_unlock(&chip->midi_input_lock);
60 return IRQ_HANDLED;
61 }
62
63 static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
64 {
65 unsigned long flags;
66 struct snd_sb *chip;
67 unsigned int valid_open_flags;
68
69 chip = substream->rmidi->private_data;
70 valid_open_flags = chip->hardware >= SB_HW_20
71 ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
72 spin_lock_irqsave(&chip->open_lock, flags);
73 if (chip->open & ~valid_open_flags) {
74 spin_unlock_irqrestore(&chip->open_lock, flags);
75 return -EAGAIN;
76 }
77 chip->open |= SB_OPEN_MIDI_INPUT;
78 chip->midi_substream_input = substream;
79 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
80 spin_unlock_irqrestore(&chip->open_lock, flags);
81 snd_sbdsp_reset(chip); /* reset DSP */
82 if (chip->hardware >= SB_HW_20)
83 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
84 } else {
85 spin_unlock_irqrestore(&chip->open_lock, flags);
86 }
87 return 0;
88 }
89
90 static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
91 {
92 unsigned long flags;
93 struct snd_sb *chip;
94 unsigned int valid_open_flags;
95
96 chip = substream->rmidi->private_data;
97 valid_open_flags = chip->hardware >= SB_HW_20
98 ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
99 spin_lock_irqsave(&chip->open_lock, flags);
100 if (chip->open & ~valid_open_flags) {
101 spin_unlock_irqrestore(&chip->open_lock, flags);
102 return -EAGAIN;
103 }
104 chip->open |= SB_OPEN_MIDI_OUTPUT;
105 chip->midi_substream_output = substream;
106 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
107 spin_unlock_irqrestore(&chip->open_lock, flags);
108 snd_sbdsp_reset(chip); /* reset DSP */
109 if (chip->hardware >= SB_HW_20)
110 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
111 } else {
112 spin_unlock_irqrestore(&chip->open_lock, flags);
113 }
114 return 0;
115 }
116
117 static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
118 {
119 unsigned long flags;
120 struct snd_sb *chip;
121
122 chip = substream->rmidi->private_data;
123 spin_lock_irqsave(&chip->open_lock, flags);
124 chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
125 chip->midi_substream_input = NULL;
126 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
127 spin_unlock_irqrestore(&chip->open_lock, flags);
128 snd_sbdsp_reset(chip); /* reset DSP */
129 } else {
130 spin_unlock_irqrestore(&chip->open_lock, flags);
131 }
132 return 0;
133 }
134
135 static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
136 {
137 unsigned long flags;
138 struct snd_sb *chip;
139
140 chip = substream->rmidi->private_data;
141 spin_lock_irqsave(&chip->open_lock, flags);
142 chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
143 chip->midi_substream_output = NULL;
144 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
145 spin_unlock_irqrestore(&chip->open_lock, flags);
146 snd_sbdsp_reset(chip); /* reset DSP */
147 } else {
148 spin_unlock_irqrestore(&chip->open_lock, flags);
149 }
150 return 0;
151 }
152
153 static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 unsigned long flags;
156 struct snd_sb *chip;
157
158 chip = substream->rmidi->private_data;
159 spin_lock_irqsave(&chip->open_lock, flags);
160 if (up) {
161 if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
162 if (chip->hardware < SB_HW_20)
163 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
164 chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
165 }
166 } else {
167 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
168 if (chip->hardware < SB_HW_20)
169 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
170 chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
171 }
172 }
173 spin_unlock_irqrestore(&chip->open_lock, flags);
174 }
175
176 static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
177 {
178 unsigned long flags;
179 struct snd_sb *chip;
180 char byte;
181 int max = 32;
182
183 /* how big is Tx FIFO? */
184 chip = substream->rmidi->private_data;
185 while (max-- > 0) {
186 spin_lock_irqsave(&chip->open_lock, flags);
187 if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
188 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
189 del_timer(&chip->midi_timer);
190 spin_unlock_irqrestore(&chip->open_lock, flags);
191 break;
192 }
193 if (chip->hardware >= SB_HW_20) {
194 int timeout = 8;
195 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
196 ;
197 if (timeout == 0) {
198 /* Tx FIFO full - try again later */
199 spin_unlock_irqrestore(&chip->open_lock, flags);
200 break;
201 }
202 outb(byte, SBP(chip, WRITE));
203 } else {
204 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
205 snd_sbdsp_command(chip, byte);
206 }
207 snd_rawmidi_transmit_ack(substream, 1);
208 spin_unlock_irqrestore(&chip->open_lock, flags);
209 }
210 }
211
212 static void snd_sb8dsp_midi_output_timer(unsigned long data)
213 {
214 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;
215 struct snd_sb * chip = substream->rmidi->private_data;
216 unsigned long flags;
217
218 spin_lock_irqsave(&chip->open_lock, flags);
219 chip->midi_timer.expires = 1 + jiffies;
220 add_timer(&chip->midi_timer);
221 spin_unlock_irqrestore(&chip->open_lock, flags);
222 snd_sb8dsp_midi_output_write(substream);
223 }
224
225 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
226 {
227 unsigned long flags;
228 struct snd_sb *chip;
229
230 chip = substream->rmidi->private_data;
231 spin_lock_irqsave(&chip->open_lock, flags);
232 if (up) {
233 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
234 init_timer(&chip->midi_timer);
235 chip->midi_timer.function = snd_sb8dsp_midi_output_timer;
236 chip->midi_timer.data = (unsigned long) substream;
237 chip->midi_timer.expires = 1 + jiffies;
238 add_timer(&chip->midi_timer);
239 chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
240 }
241 } else {
242 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
243 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
244 }
245 }
246 spin_unlock_irqrestore(&chip->open_lock, flags);
247
248 if (up)
249 snd_sb8dsp_midi_output_write(substream);
250 }
251
252 static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
253 {
254 .open = snd_sb8dsp_midi_output_open,
255 .close = snd_sb8dsp_midi_output_close,
256 .trigger = snd_sb8dsp_midi_output_trigger,
257 };
258
259 static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
260 {
261 .open = snd_sb8dsp_midi_input_open,
262 .close = snd_sb8dsp_midi_input_close,
263 .trigger = snd_sb8dsp_midi_input_trigger,
264 };
265
266 int snd_sb8dsp_midi(struct snd_sb *chip, int device, struct snd_rawmidi ** rrawmidi)
267 {
268 struct snd_rawmidi *rmidi;
269 int err;
270
271 if (rrawmidi)
272 *rrawmidi = NULL;
273 if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
274 return err;
275 strcpy(rmidi->name, "SB8 MIDI");
276 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
277 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
278 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
279 if (chip->hardware >= SB_HW_20)
280 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
281 rmidi->private_data = chip;
282 chip->rmidi = rmidi;
283 if (rrawmidi)
284 *rrawmidi = rmidi;
285 return 0;
286 }
287
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