sound/isa/sb/sb8_midi.c - third_party/kernel - Git at Google

 /*
  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  *  Routines for control of SoundBlaster cards - MIDI interface
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   (at your option) any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
  * --
  *
  * 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;

 	if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 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;
 }
	/*
	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
	* Routines for control of SoundBlaster cards - MIDI interface
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* --
	*
	* 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;

	if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 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;
	}