1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Routines for control of SoundBlaster cards - MIDI interface
5 *
6 * --
7 *
8 * Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
9 * Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
10 * working.
11 *
12 * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
13 * Added full duplex UART mode for DSP version 2.0 and later.
14 */
15
16 #include <linux/io.h>
17 #include <linux/time.h>
18 #include <sound/core.h>
19 #include <sound/sb.h>
20
21
22 irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
23 {
24 struct snd_rawmidi *rmidi;
25 int max = 64;
26 char byte;
27
28 if (!chip)
29 return IRQ_NONE;
30
31 rmidi = chip->rmidi;
32 if (!rmidi) {
33 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
34 return IRQ_NONE;
35 }
36
37 spin_lock(&chip->midi_input_lock);
38 while (max-- > 0) {
39 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
40 byte = inb(SBP(chip, READ));
41 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
42 snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
43 }
44 }
45 }
46 spin_unlock(&chip->midi_input_lock);
47 return IRQ_HANDLED;
48 }
49
50 static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
51 {
52 unsigned long flags;
53 struct snd_sb *chip;
54 unsigned int valid_open_flags;
55
56 chip = substream->rmidi->private_data;
57 valid_open_flags = chip->hardware >= SB_HW_20
58 ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
59 spin_lock_irqsave(&chip->open_lock, flags);
60 if (chip->open & ~valid_open_flags) {
61 spin_unlock_irqrestore(&chip->open_lock, flags);
62 return -EAGAIN;
63 }
64 chip->open |= SB_OPEN_MIDI_INPUT;
65 chip->midi_substream_input = substream;
66 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
67 spin_unlock_irqrestore(&chip->open_lock, flags);
68 snd_sbdsp_reset(chip); /* reset DSP */
69 if (chip->hardware >= SB_HW_20)
70 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
71 } else {
72 spin_unlock_irqrestore(&chip->open_lock, flags);
73 }
74 return 0;
75 }
76
77 static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
78 {
79 unsigned long flags;
80 struct snd_sb *chip;
81 unsigned int valid_open_flags;
82
83 chip = substream->rmidi->private_data;
84 valid_open_flags = chip->hardware >= SB_HW_20
85 ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
86 spin_lock_irqsave(&chip->open_lock, flags);
87 if (chip->open & ~valid_open_flags) {
88 spin_unlock_irqrestore(&chip->open_lock, flags);
89 return -EAGAIN;
90 }
91 chip->open |= SB_OPEN_MIDI_OUTPUT;
92 chip->midi_substream_output = substream;
93 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
94 spin_unlock_irqrestore(&chip->open_lock, flags);
95 snd_sbdsp_reset(chip); /* reset DSP */
96 if (chip->hardware >= SB_HW_20)
97 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
98 } else {
99 spin_unlock_irqrestore(&chip->open_lock, flags);
100 }
101 return 0;
102 }
103
104 static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
105 {
106 unsigned long flags;
107 struct snd_sb *chip;
108
109 chip = substream->rmidi->private_data;
110 spin_lock_irqsave(&chip->open_lock, flags);
111 chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
112 chip->midi_substream_input = NULL;
113 if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
114 spin_unlock_irqrestore(&chip->open_lock, flags);
115 snd_sbdsp_reset(chip); /* reset DSP */
116 } else {
117 spin_unlock_irqrestore(&chip->open_lock, flags);
118 }
119 return 0;
120 }
121
122 static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
123 {
124 unsigned long flags;
125 struct snd_sb *chip;
126
127 chip = substream->rmidi->private_data;
128 del_timer_sync(&chip->midi_timer);
129 spin_lock_irqsave(&chip->open_lock, flags);
130 chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
131 chip->midi_substream_output = NULL;
132 if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
133 spin_unlock_irqrestore(&chip->open_lock, flags);
134 snd_sbdsp_reset(chip); /* reset DSP */
135 } else {
136 spin_unlock_irqrestore(&chip->open_lock, flags);
137 }
138 return 0;
139 }
140
141 static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
142 {
143 unsigned long flags;
144 struct snd_sb *chip;
145
146 chip = substream->rmidi->private_data;
147 spin_lock_irqsave(&chip->open_lock, flags);
148 if (up) {
149 if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
150 if (chip->hardware < SB_HW_20)
151 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
152 chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
153 }
154 } else {
155 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
156 if (chip->hardware < SB_HW_20)
157 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
158 chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
159 }
160 }
161 spin_unlock_irqrestore(&chip->open_lock, flags);
162 }
163
164 static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
165 {
166 unsigned long flags;
167 struct snd_sb *chip;
168 char byte;
169 int max = 32;
170
171 /* how big is Tx FIFO? */
172 chip = substream->rmidi->private_data;
173 while (max-- > 0) {
174 spin_lock_irqsave(&chip->open_lock, flags);
175 if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
176 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
177 del_timer(&chip->midi_timer);
178 spin_unlock_irqrestore(&chip->open_lock, flags);
179 break;
180 }
181 if (chip->hardware >= SB_HW_20) {
182 int timeout = 8;
183 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
184 ;
185 if (timeout == 0) {
186 /* Tx FIFO full - try again later */
187 spin_unlock_irqrestore(&chip->open_lock, flags);
188 break;
189 }
190 outb(byte, SBP(chip, WRITE));
191 } else {
192 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
193 snd_sbdsp_command(chip, byte);
194 }
195 snd_rawmidi_transmit_ack(substream, 1);
196 spin_unlock_irqrestore(&chip->open_lock, flags);
197 }
198 }
199
200 static void snd_sb8dsp_midi_output_timer(struct timer_list *t)
201 {
202 struct snd_sb *chip = from_timer(chip, t, midi_timer);
203 struct snd_rawmidi_substream *substream = chip->midi_substream_output;
204 unsigned long flags;
205
206 spin_lock_irqsave(&chip->open_lock, flags);
207 mod_timer(&chip->midi_timer, 1 + jiffies);
208 spin_unlock_irqrestore(&chip->open_lock, flags);
209 snd_sb8dsp_midi_output_write(substream);
210 }
211
212 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
213 {
214 unsigned long flags;
215 struct snd_sb *chip;
216
217 chip = substream->rmidi->private_data;
218 spin_lock_irqsave(&chip->open_lock, flags);
219 if (up) {
220 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
221 mod_timer(&chip->midi_timer, 1 + jiffies);
222 chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
223 }
224 } else {
225 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
226 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
227 }
228 }
229 spin_unlock_irqrestore(&chip->open_lock, flags);
230
231 if (up)
232 snd_sb8dsp_midi_output_write(substream);
233 }
234
235 static const struct snd_rawmidi_ops snd_sb8dsp_midi_output =
236 {
237 .open = snd_sb8dsp_midi_output_open,
238 .close = snd_sb8dsp_midi_output_close,
239 .trigger = snd_sb8dsp_midi_output_trigger,
240 };
241
242 static const struct snd_rawmidi_ops snd_sb8dsp_midi_input =
243 {
244 .open = snd_sb8dsp_midi_input_open,
245 .close = snd_sb8dsp_midi_input_close,
246 .trigger = snd_sb8dsp_midi_input_trigger,
247 };
248
249 int snd_sb8dsp_midi(struct snd_sb *chip, int device)
250 {
251 struct snd_rawmidi *rmidi;
252 int err;
253
254 err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi);
255 if (err < 0)
256 return err;
257 strcpy(rmidi->name, "SB8 MIDI");
258 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
259 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
260 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
261 if (chip->hardware >= SB_HW_20)
262 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
263 rmidi->private_data = chip;
264 timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
265 chip->rmidi = rmidi;
266 return 0;
267 }
268
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