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