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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Copyright (c) 2009 by Krzysztof Helt
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* Routines for control of MPU-401 in UART mode
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* MPU-401 supports UART mode which is not capable generate transmit
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* interrupts thus output is done via polling. Also, if irq < 0, then
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* input is done also via polling. Do not expect good performance.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/rawmidi.h>
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#define MSNDMIDI_MODE_BIT_INPUT 0
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#define MSNDMIDI_MODE_BIT_OUTPUT 1
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#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
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#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
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unsigned long mode; /* MSNDMIDI_MODE_XXXX */
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struct snd_rawmidi_substream *substream_input;
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spinlock_t input_lock;
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* input/output open/close - protected by open_mutex in rawmidi.c
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static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
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struct snd_msndmidi *mpu;
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snd_printdd("snd_msndmidi_input_open()\n");
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mpu = substream->rmidi->private_data;
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mpu->substream_input = substream;
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snd_msnd_enable_irq(mpu->dev);
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snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
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set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
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static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
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struct snd_msndmidi *mpu;
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mpu = substream->rmidi->private_data;
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snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
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clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
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mpu->substream_input = NULL;
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snd_msnd_disable_irq(mpu->dev);
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static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
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tail = readw(mpu->dev->MIDQ + JQS_wTail);
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writew(tail, mpu->dev->MIDQ + JQS_wHead);
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static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
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struct snd_msndmidi *mpu;
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snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
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mpu = substream->rmidi->private_data;
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spin_lock_irqsave(&mpu->input_lock, flags);
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if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
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snd_msndmidi_input_drop(mpu);
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clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
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spin_unlock_irqrestore(&mpu->input_lock, flags);
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snd_msndmidi_input_read(mpu);
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void snd_msndmidi_input_read(void *mpuv)
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struct snd_msndmidi *mpu = mpuv;
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void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
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u16 head, tail, size;
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spin_lock_irqsave(&mpu->input_lock, flags);
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head = readw(mpu->dev->MIDQ + JQS_wHead);
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tail = readw(mpu->dev->MIDQ + JQS_wTail);
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size = readw(mpu->dev->MIDQ + JQS_wSize);
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if (head > size || tail > size)
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while (head != tail) {
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unsigned char val = readw(pwMIDQData + 2 * head);
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if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
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snd_rawmidi_receive(mpu->substream_input, &val, 1);
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writew(head, mpu->dev->MIDQ + JQS_wHead);
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spin_unlock_irqrestore(&mpu->input_lock, flags);
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EXPORT_SYMBOL(snd_msndmidi_input_read);
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static const struct snd_rawmidi_ops snd_msndmidi_input = {
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.open = snd_msndmidi_input_open,
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.close = snd_msndmidi_input_close,
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.trigger = snd_msndmidi_input_trigger,
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static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
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struct snd_msndmidi *mpu = rmidi->private_data;
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int snd_msndmidi_new(struct snd_card *card, int device)
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struct snd_msnd *chip = card->private_data;
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struct snd_msndmidi *mpu;
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struct snd_rawmidi *rmidi;
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err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
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mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
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snd_device_free(card, rmidi);
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chip->msndmidi_mpu = mpu;
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rmidi->private_data = mpu;
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rmidi->private_free = snd_msndmidi_free;
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spin_lock_init(&mpu->input_lock);
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strcpy(rmidi->name, "MSND MIDI");
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
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&snd_msndmidi_input);
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;