diff options
Diffstat (limited to 'sound/isa/sb/sb8_midi.c')
| -rw-r--r-- | sound/isa/sb/sb8_midi.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/sound/isa/sb/sb8_midi.c b/sound/isa/sb/sb8_midi.c new file mode 100644 index 000000000..618366d5d --- /dev/null +++ b/sound/isa/sb/sb8_midi.c @@ -0,0 +1,267 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Routines for control of SoundBlaster cards - MIDI interface + * + * -- + * + * Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk> + * Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from + * working. + * + * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de> + * Added full duplex UART mode for DSP version 2.0 and later. + */ + +#include <linux/io.h> +#include <linux/time.h> +#include <sound/core.h> +#include <sound/sb.h> + + +irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip) +{ + struct snd_rawmidi *rmidi; + int max = 64; + char byte; + + if (!chip) + return IRQ_NONE; + + rmidi = chip->rmidi; + if (!rmidi) { + inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */ + return IRQ_NONE; + } + + spin_lock(&chip->midi_input_lock); + while (max-- > 0) { + if (inb(SBP(chip, DATA_AVAIL)) & 0x80) { + byte = inb(SBP(chip, READ)); + if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) { + snd_rawmidi_receive(chip->midi_substream_input, &byte, 1); + } + } + } + spin_unlock(&chip->midi_input_lock); + return IRQ_HANDLED; +} + +static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream) +{ + unsigned long flags; + struct snd_sb *chip; + unsigned int valid_open_flags; + + chip = substream->rmidi->private_data; + valid_open_flags = chip->hardware >= SB_HW_20 + ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0; + spin_lock_irqsave(&chip->open_lock, flags); + if (chip->open & ~valid_open_flags) { + spin_unlock_irqrestore(&chip->open_lock, flags); + return -EAGAIN; + } + chip->open |= SB_OPEN_MIDI_INPUT; + chip->midi_substream_input = substream; + if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) { + spin_unlock_irqrestore(&chip->open_lock, flags); + snd_sbdsp_reset(chip); /* reset DSP */ + if (chip->hardware >= SB_HW_20) + snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ); + } else { + spin_unlock_irqrestore(&chip->open_lock, flags); + } + return 0; +} + +static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream) +{ + unsigned long flags; + struct snd_sb *chip; + unsigned int valid_open_flags; + + chip = substream->rmidi->private_data; + valid_open_flags = chip->hardware >= SB_HW_20 + ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0; + spin_lock_irqsave(&chip->open_lock, flags); + if (chip->open & ~valid_open_flags) { + spin_unlock_irqrestore(&chip->open_lock, flags); + return -EAGAIN; + } + chip->open |= SB_OPEN_MIDI_OUTPUT; + chip->midi_substream_output = substream; + if (!(chip->open & SB_OPEN_MIDI_INPUT)) { + spin_unlock_irqrestore(&chip->open_lock, flags); + snd_sbdsp_reset(chip); /* reset DSP */ + if (chip->hardware >= SB_HW_20) + snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ); + } else { + spin_unlock_irqrestore(&chip->open_lock, flags); + } + return 0; +} + +static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream) +{ + unsigned long flags; + struct snd_sb *chip; + + chip = substream->rmidi->private_data; + spin_lock_irqsave(&chip->open_lock, flags); + chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER); + chip->midi_substream_input = NULL; + if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) { + spin_unlock_irqrestore(&chip->open_lock, flags); + snd_sbdsp_reset(chip); /* reset DSP */ + } else { + spin_unlock_irqrestore(&chip->open_lock, flags); + } + return 0; +} + +static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream) +{ + unsigned long flags; + struct snd_sb *chip; + + chip = substream->rmidi->private_data; + del_timer_sync(&chip->midi_timer); + spin_lock_irqsave(&chip->open_lock, flags); + chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER); + chip->midi_substream_output = NULL; + if (!(chip->open & SB_OPEN_MIDI_INPUT)) { + spin_unlock_irqrestore(&chip->open_lock, flags); + snd_sbdsp_reset(chip); /* reset DSP */ + } else { + spin_unlock_irqrestore(&chip->open_lock, flags); + } + return 0; +} + +static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) +{ + unsigned long flags; + struct snd_sb *chip; + + chip = substream->rmidi->private_data; + spin_lock_irqsave(&chip->open_lock, flags); + if (up) { + if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) { + if (chip->hardware < SB_HW_20) + snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ); + chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER; + } + } else { + if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) { + if (chip->hardware < SB_HW_20) + snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ); + chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER; + } + } + spin_unlock_irqrestore(&chip->open_lock, flags); +} + +static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream) +{ + unsigned long flags; + struct snd_sb *chip; + char byte; + int max = 32; + + /* how big is Tx FIFO? */ + chip = substream->rmidi->private_data; + while (max-- > 0) { + spin_lock_irqsave(&chip->open_lock, flags); + if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) { + chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER; + del_timer(&chip->midi_timer); + spin_unlock_irqrestore(&chip->open_lock, flags); + break; + } + if (chip->hardware >= SB_HW_20) { + int timeout = 8; + while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0) + ; + if (timeout == 0) { + /* Tx FIFO full - try again later */ + spin_unlock_irqrestore(&chip->open_lock, flags); + break; + } + outb(byte, SBP(chip, WRITE)); + } else { + snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT); + snd_sbdsp_command(chip, byte); + } + snd_rawmidi_transmit_ack(substream, 1); + spin_unlock_irqrestore(&chip->open_lock, flags); + } +} + +static void snd_sb8dsp_midi_output_timer(struct timer_list *t) +{ + struct snd_sb *chip = from_timer(chip, t, midi_timer); + struct snd_rawmidi_substream *substream = chip->midi_substream_output; + unsigned long flags; + + spin_lock_irqsave(&chip->open_lock, flags); + mod_timer(&chip->midi_timer, 1 + jiffies); + spin_unlock_irqrestore(&chip->open_lock, flags); + snd_sb8dsp_midi_output_write(substream); +} + +static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) +{ + unsigned long flags; + struct snd_sb *chip; + + chip = substream->rmidi->private_data; + spin_lock_irqsave(&chip->open_lock, flags); + if (up) { + if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) { + mod_timer(&chip->midi_timer, 1 + jiffies); + chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER; + } + } else { + if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) { + chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER; + } + } + spin_unlock_irqrestore(&chip->open_lock, flags); + + if (up) + snd_sb8dsp_midi_output_write(substream); +} + +static const struct snd_rawmidi_ops snd_sb8dsp_midi_output = +{ + .open = snd_sb8dsp_midi_output_open, + .close = snd_sb8dsp_midi_output_close, + .trigger = snd_sb8dsp_midi_output_trigger, +}; + +static const struct snd_rawmidi_ops snd_sb8dsp_midi_input = +{ + .open = snd_sb8dsp_midi_input_open, + .close = snd_sb8dsp_midi_input_close, + .trigger = snd_sb8dsp_midi_input_trigger, +}; + +int snd_sb8dsp_midi(struct snd_sb *chip, int device) +{ + struct snd_rawmidi *rmidi; + int err; + + err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi); + if (err < 0) + return err; + strcpy(rmidi->name, "SB8 MIDI"); + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output); + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input); + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT; + if (chip->hardware >= SB_HW_20) + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; + rmidi->private_data = chip; + timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0); + chip->rmidi = rmidi; + return 0; +} |