sound/isa/sb/sb8_midi.c

   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         if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
 255                 return err;
 256         strcpy(rmidi->name, "SB8 MIDI");
 257         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
 258         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
 259         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
 260         if (chip->hardware >= SB_HW_20)
 261                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 262         rmidi->private_data = chip;
 263         timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
 264         chip->rmidi = rmidi;
 265         return 0;
 266 }