kernel/sound/isa/sb/sb8_midi.c

   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 <linux/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         mod_timer(&chip->midi_timer, 1 + jiffies);
 220         spin_unlock_irqrestore(&chip->open_lock, flags);
 221         snd_sb8dsp_midi_output_write(substream);
 222 }
 223
 224 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 225 {
 226         unsigned long flags;
 227         struct snd_sb *chip;
 228
 229         chip = substream->rmidi->private_data;
 230         spin_lock_irqsave(&chip->open_lock, flags);
 231         if (up) {
 232                 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
 233                         setup_timer(&chip->midi_timer,
 234                                     snd_sb8dsp_midi_output_timer,
 235                                     (unsigned long) substream);
 236                         mod_timer(&chip->midi_timer, 1 + jiffies);
 237                         chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
 238                 }
 239         } else {
 240                 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
 241                         chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
 242                 }
 243         }
 244         spin_unlock_irqrestore(&chip->open_lock, flags);
 245
 246         if (up)
 247                 snd_sb8dsp_midi_output_write(substream);
 248 }
 249
 250 static struct snd_rawmidi_ops snd_sb8dsp_midi_output =
 251 {
 252         .open =         snd_sb8dsp_midi_output_open,
 253         .close =        snd_sb8dsp_midi_output_close,
 254         .trigger =      snd_sb8dsp_midi_output_trigger,
 255 };
 256
 257 static struct snd_rawmidi_ops snd_sb8dsp_midi_input =
 258 {
 259         .open =         snd_sb8dsp_midi_input_open,
 260         .close =        snd_sb8dsp_midi_input_close,
 261         .trigger =      snd_sb8dsp_midi_input_trigger,
 262 };
 263
 264 int snd_sb8dsp_midi(struct snd_sb *chip, int device)
 265 {
 266         struct snd_rawmidi *rmidi;
 267         int err;
 268
 269         if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
 270                 return err;
 271         strcpy(rmidi->name, "SB8 MIDI");
 272         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
 273         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
 274         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
 275         if (chip->hardware >= SB_HW_20)
 276                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 277         rmidi->private_data = chip;
 278         chip->rmidi = rmidi;
 279         return 0;
 280 }