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/*

 *  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 <sound/driver.h>

#include <asm/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;

        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(unsigned long data)

{

        struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *) data;

        struct snd_sb * chip = substream->rmidi->private_data;

        unsigned long flags;

        spin_lock_irqsave(&chip->open_lock, flags);

        chip->midi_timer.expires = 1 + jiffies;

        add_timer(&chip->midi_timer);

        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)) {

                        init_timer(&chip->midi_timer);

                        chip->midi_timer.function = snd_sb8dsp_midi_output_timer;

                        chip->midi_timer.data = (unsigned long) substream;

                        chip->midi_timer.expires = 1 + jiffies;

                        add_timer(&chip->midi_timer);

                        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 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 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 ** rrawmidi)

{

        struct snd_rawmidi *rmidi;

        int err;

        if (rrawmidi)

                *rrawmidi = NULL;

        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;

        chip->rmidi = rmidi;

        if (rrawmidi)

                *rrawmidi = rmidi;

        return 0;

}