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sb8_midi.c
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1 /*
2  * Copyright (c) by Jaroslav Kysela <[email protected]>
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 <[email protected]>
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 <[email protected]>
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 }
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