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root/sound/pci/emu10k1/emumpu401.c

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DEFINITIONS

This source file includes following definitions.
  1. mpu401_read
  2. mpu401_write
  3. mpu401_clear_rx
  4. do_emu10k1_midi_interrupt
  5. snd_emu10k1_midi_interrupt
  6. snd_emu10k1_midi_interrupt2
  7. snd_emu10k1_midi_cmd
  8. snd_emu10k1_midi_input_open
  9. snd_emu10k1_midi_output_open
  10. snd_emu10k1_midi_input_close
  11. snd_emu10k1_midi_output_close
  12. snd_emu10k1_midi_input_trigger
  13. snd_emu10k1_midi_output_trigger
  14. snd_emu10k1_midi_free
  15. emu10k1_midi_init
  16. snd_emu10k1_midi
  17. snd_emu10k1_audigy_midi

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of EMU10K1 MPU-401 in UART mode
 *
 *
 *   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
 *
 */

#include <linux/time.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/emu10k1.h>

#define EMU10K1_MIDI_MODE_INPUT         (1<<0)
#define EMU10K1_MIDI_MODE_OUTPUT        (1<<1)

static inline unsigned char mpu401_read(struct snd_emu10k1 *emu,
                                        struct snd_emu10k1_midi *mpu, int idx)
{
        if (emu->audigy)
                return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0);
        else
                return inb(emu->port + mpu->port + idx);
}

static inline void mpu401_write(struct snd_emu10k1 *emu,
                                struct snd_emu10k1_midi *mpu, int data, int idx)
{
        if (emu->audigy)
                snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data);
        else
                outb(data, emu->port + mpu->port + idx);
}

#define mpu401_write_data(emu, mpu, data)       mpu401_write(emu, mpu, data, 0)
#define mpu401_write_cmd(emu, mpu, data)        mpu401_write(emu, mpu, data, 1)
#define mpu401_read_data(emu, mpu)              mpu401_read(emu, mpu, 0)
#define mpu401_read_stat(emu, mpu)              mpu401_read(emu, mpu, 1)

#define mpu401_input_avail(emu,mpu)     (!(mpu401_read_stat(emu,mpu) & 0x80))
#define mpu401_output_ready(emu,mpu)    (!(mpu401_read_stat(emu,mpu) & 0x40))

#define MPU401_RESET            0xff
#define MPU401_ENTER_UART       0x3f
#define MPU401_ACK              0xfe

static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu)
{
        int timeout = 100000;
        for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--)
                mpu401_read_data(emu, mpu);
#ifdef CONFIG_SND_DEBUG
        if (timeout <= 0)
                snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", mpu401_read_stat(emu, mpu));
#endif
}

/*

 */

static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, unsigned int status)
{
        unsigned char byte;

        if (midi->rmidi == NULL) {
                snd_emu10k1_intr_disable(emu, midi->tx_enable | midi->rx_enable);
                return;
        }

        spin_lock(&midi->input_lock);
        if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) {
                if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
                        mpu401_clear_rx(emu, midi);
                } else {
                        byte = mpu401_read_data(emu, midi);
                        if (midi->substream_input)
                                snd_rawmidi_receive(midi->substream_input, &byte, 1);
                }
        }
        spin_unlock(&midi->input_lock);

        spin_lock(&midi->output_lock);
        if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) {
                if (midi->substream_output &&
                    snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
                        mpu401_write_data(emu, midi, byte);
                } else {
                        snd_emu10k1_intr_disable(emu, midi->tx_enable);
                }
        }
        spin_unlock(&midi->output_lock);
}

static void snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status)
{
        do_emu10k1_midi_interrupt(emu, &emu->midi, status);
}

static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status)
{
        do_emu10k1_midi_interrupt(emu, &emu->midi2, status);
}

static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_midi *midi, unsigned char cmd, int ack)
{
        unsigned long flags;
        int timeout, ok;

        spin_lock_irqsave(&midi->input_lock, flags);
        mpu401_write_data(emu, midi, 0x00);
        /* mpu401_clear_rx(emu, midi); */

        mpu401_write_cmd(emu, midi, cmd);
        if (ack) {
                ok = 0;
                timeout = 10000;
                while (!ok && timeout-- > 0) {
                        if (mpu401_input_avail(emu, midi)) {
                                if (mpu401_read_data(emu, midi) == MPU401_ACK)
                                        ok = 1;
                        }
                }
                if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK)
                        ok = 1;
        } else {
                ok = 1;
        }
        spin_unlock_irqrestore(&midi->input_lock, flags);
        if (!ok) {
                snd_printk(KERN_ERR "midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n",
                           cmd, emu->port,
                           mpu401_read_stat(emu, midi),
                           mpu401_read_data(emu, midi));
                return 1;
        }
        return 0;
}

static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        unsigned long flags;

        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return -ENXIO;
        spin_lock_irqsave(&midi->open_lock, flags);
        midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT;
        midi->substream_input = substream;
        if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
                spin_unlock_irqrestore(&midi->open_lock, flags);
                if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
                        goto error_out;
                if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
                        goto error_out;
        } else {
                spin_unlock_irqrestore(&midi->open_lock, flags);
        }
        return 0;

error_out:
        return -EIO;
}

static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        unsigned long flags;

        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return -ENXIO;
        spin_lock_irqsave(&midi->open_lock, flags);
        midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT;
        midi->substream_output = substream;
        if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
                spin_unlock_irqrestore(&midi->open_lock, flags);
                if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
                        goto error_out;
                if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
                        goto error_out;
        } else {
                spin_unlock_irqrestore(&midi->open_lock, flags);
        }
        return 0;

error_out:
        return -EIO;
}

static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        unsigned long flags;
        int err = 0;

        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return -ENXIO;
        spin_lock_irqsave(&midi->open_lock, flags);
        snd_emu10k1_intr_disable(emu, midi->rx_enable);
        midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT;
        midi->substream_input = NULL;
        if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
                spin_unlock_irqrestore(&midi->open_lock, flags);
                err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
        } else {
                spin_unlock_irqrestore(&midi->open_lock, flags);
        }
        return err;
}

static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        unsigned long flags;
        int err = 0;

        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return -ENXIO;
        spin_lock_irqsave(&midi->open_lock, flags);
        snd_emu10k1_intr_disable(emu, midi->tx_enable);
        midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT;
        midi->substream_output = NULL;
        if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
                spin_unlock_irqrestore(&midi->open_lock, flags);
                err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
        } else {
                spin_unlock_irqrestore(&midi->open_lock, flags);
        }
        return err;
}

static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return;

        if (up)
                snd_emu10k1_intr_enable(emu, midi->rx_enable);
        else
                snd_emu10k1_intr_disable(emu, midi->rx_enable);
}

static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
        struct snd_emu10k1 *emu;
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
        unsigned long flags;

        emu = midi->emu;
        if (snd_BUG_ON(!emu))
                return;

        if (up) {
                int max = 4;
                unsigned char byte;
        
                /* try to send some amount of bytes here before interrupts */
                spin_lock_irqsave(&midi->output_lock, flags);
                while (max > 0) {
                        if (mpu401_output_ready(emu, midi)) {
                                if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT) ||
                                    snd_rawmidi_transmit(substream, &byte, 1) != 1) {
                                        /* no more data */
                                        spin_unlock_irqrestore(&midi->output_lock, flags);
                                        return;
                                }
                                mpu401_write_data(emu, midi, byte);
                                max--;
                        } else {
                                break;
                        }
                }
                spin_unlock_irqrestore(&midi->output_lock, flags);
                snd_emu10k1_intr_enable(emu, midi->tx_enable);
        } else {
                snd_emu10k1_intr_disable(emu, midi->tx_enable);
        }
}

/*

 */

static struct snd_rawmidi_ops snd_emu10k1_midi_output =
{
        .open =         snd_emu10k1_midi_output_open,
        .close =        snd_emu10k1_midi_output_close,
        .trigger =      snd_emu10k1_midi_output_trigger,
};

static struct snd_rawmidi_ops snd_emu10k1_midi_input =
{
        .open =         snd_emu10k1_midi_input_open,
        .close =        snd_emu10k1_midi_input_close,
        .trigger =      snd_emu10k1_midi_input_trigger,
};

static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi)
{
        struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)rmidi->private_data;
        midi->interrupt = NULL;
        midi->rmidi = NULL;
}

static int __devinit emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, int device, char *name)
{
        struct snd_rawmidi *rmidi;
        int err;

        if ((err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi)) < 0)
                return err;
        midi->emu = emu;
        spin_lock_init(&midi->open_lock);
        spin_lock_init(&midi->input_lock);
        spin_lock_init(&midi->output_lock);
        strcpy(rmidi->name, name);
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1_midi_output);
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_midi_input);
        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
                             SNDRV_RAWMIDI_INFO_INPUT |
                             SNDRV_RAWMIDI_INFO_DUPLEX;
        rmidi->private_data = midi;
        rmidi->private_free = snd_emu10k1_midi_free;
        midi->rmidi = rmidi;
        return 0;
}

int __devinit snd_emu10k1_midi(struct snd_emu10k1 *emu)
{
        struct snd_emu10k1_midi *midi = &emu->midi;
        int err;

        if ((err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)")) < 0)
                return err;

        midi->tx_enable = INTE_MIDITXENABLE;
        midi->rx_enable = INTE_MIDIRXENABLE;
        midi->port = MUDATA;
        midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
        midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
        midi->interrupt = snd_emu10k1_midi_interrupt;
        return 0;
}

int __devinit snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu)
{
        struct snd_emu10k1_midi *midi;
        int err;

        midi = &emu->midi;
        if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0)
                return err;

        midi->tx_enable = INTE_MIDITXENABLE;
        midi->rx_enable = INTE_MIDIRXENABLE;
        midi->port = A_MUDATA1;
        midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
        midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
        midi->interrupt = snd_emu10k1_midi_interrupt;

        midi = &emu->midi2;
        if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0)
                return err;

        midi->tx_enable = INTE_A_MIDITXENABLE2;
        midi->rx_enable = INTE_A_MIDIRXENABLE2;
        midi->port = A_MUDATA2;
        midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2;
        midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2;
        midi->interrupt = snd_emu10k1_midi_interrupt2;
        return 0;
}

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