/* ********************************************************************** *     midi.c - /dev/midi interface for emu10k1 driver *     Copyright 1999, 2000 Creative Labs, Inc. * ********************************************************************** * *     Date                 Author          Summary of changes *     ----                 ------          ------------------ *     October 20, 1999     Bertrand Lee    base code release * ********************************************************************** * *     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., 675 Mass Ave, Cambridge, MA 02139, *     USA. * ********************************************************************** */#define __NO_VERSION__#include <linux/module.h>#include <linux/malloc.h>#include <linux/version.h>#include <linux/sched.h>#include <linux/smp_lock.h>#include <asm/uaccess.h>#include "hwaccess.h"#include "cardmo.h"#include "cardmi.h"#include "midi.h"static spinlock_t midi_spinlock __attribute((unused)) = SPIN_LOCK_UNLOCKED;static void init_midi_hdr(struct midi_hdr *midihdr){	midihdr->bufferlength = MIDIIN_BUFLEN;	midihdr->bytesrecorded = 0;	midihdr->flags = 0;}static int midiin_add_buffer(struct emu10k1_mididevice *midi_dev, struct midi_hdr **midihdrptr){	struct midi_hdr *midihdr;	if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr *), GFP_KERNEL)) == NULL) {		ERROR();		return -EINVAL;	}	init_midi_hdr(midihdr);	if ((midihdr->data = (u8 *) kmalloc(MIDIIN_BUFLEN, GFP_KERNEL)) == NULL) {		ERROR();		kfree(midihdr);		return -1;	}	if (emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr) < 0) {		ERROR();		kfree(midihdr->data);		kfree(midihdr);		return -1;	}	*midihdrptr = midihdr;	list_add_tail(&midihdr->list, &midi_dev->mid_hdrs);	return 0;}static int emu10k1_midi_open(struct inode *inode, struct file *file){	int minor = MINOR(inode->i_rdev);	struct emu10k1_card *card;	struct emu10k1_mididevice *midi_dev;	struct list_head *entry;	DPF(2, "emu10k1_midi_open()\n");	/* Check for correct device to open */	list_for_each(entry, &emu10k1_devs) {		card = list_entry(entry, struct emu10k1_card, list);		if (card->midi_num == minor)			break;	}	if (entry == &emu10k1_devs)		return -ENODEV;	/* Wait for device to become free */	down(&card->open_sem);	while (card->open_mode & (file->f_mode << FMODE_MIDI_SHIFT)) {		if (file->f_flags & O_NONBLOCK) {			up(&card->open_sem);			return -EBUSY;		}		up(&card->open_sem);		interruptible_sleep_on(&card->open_wait);		if (signal_pending(current)) {			return -ERESTARTSYS;		}		down(&card->open_sem);	}	if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL) {		return -EINVAL;	}	midi_dev->card = card;	midi_dev->mistate = MIDIIN_STATE_STOPPED;	init_waitqueue_head(&midi_dev->oWait);	init_waitqueue_head(&midi_dev->iWait);	midi_dev->ird = 0;	midi_dev->iwr = 0;	midi_dev->icnt = 0;	INIT_LIST_HEAD(&midi_dev->mid_hdrs);	if (file->f_mode & FMODE_READ) {		struct midi_openinfo dsCardMidiOpenInfo;		struct midi_hdr *midihdr1;		struct midi_hdr *midihdr2;		dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;		if (emu10k1_mpuin_open(card, &dsCardMidiOpenInfo) < 0) {			ERROR();			kfree(midi_dev);			return -ENODEV;		}		/* Add two buffers to receive sysex buffer */		if (midiin_add_buffer(midi_dev, &midihdr1) < 0) {			kfree(midi_dev);			return -ENODEV;		}		if (midiin_add_buffer(midi_dev, &midihdr2) < 0) {			list_del(&midihdr1->list);			kfree(midihdr1->data);			kfree(midihdr1);			kfree(midi_dev);			return -ENODEV;		}	}	if (file->f_mode & FMODE_WRITE) {		struct midi_openinfo dsCardMidiOpenInfo;		dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;		if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo) < 0) {			ERROR();			kfree(midi_dev);			return -ENODEV;		}	}	file->private_data = (void *) midi_dev;	card->open_mode |= (file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE);	up(&card->open_sem);	return 0;}static int emu10k1_midi_release(struct inode *inode, struct file *file){	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;	struct emu10k1_card *card;	lock_kernel();	card = midi_dev->card;	DPF(2, "emu10k1_midi_release()\n");	if (file->f_mode & FMODE_WRITE) {		if (!(file->f_flags & O_NONBLOCK)) {			while (!signal_pending(current) && (card->mpuout->firstmidiq != NULL)) {				DPF(4, "Cannot close - buffers not empty\n");				interruptible_sleep_on(&midi_dev->oWait);			}		}		emu10k1_mpuout_close(card);	}	if (file->f_mode & FMODE_READ) {		struct midi_hdr *midihdr;		if (midi_dev->mistate == MIDIIN_STATE_STARTED) {			emu10k1_mpuin_stop(card);			midi_dev->mistate = MIDIIN_STATE_STOPPED;		}		emu10k1_mpuin_reset(card);		emu10k1_mpuin_close(card);		while (!list_empty(&midi_dev->mid_hdrs)) {			midihdr = list_entry(midi_dev->mid_hdrs.next, struct midi_hdr, list);			list_del(midi_dev->mid_hdrs.next);			kfree(midihdr->data);			kfree(midihdr);		}	}	kfree(midi_dev);	down(&card->open_sem);	card->open_mode &= ~((file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE));	up(&card->open_sem);	wake_up_interruptible(&card->open_wait);	unlock_kernel();	return 0;}static ssize_t emu10k1_midi_read(struct file *file, char *buffer, size_t count, loff_t * pos){	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;	ssize_t ret = 0;	u16 cnt;	unsigned long flags;	DPD(4, "emu10k1_midi_read(), count %x\n", (u32) count);	if (pos != &file->f_pos)		return -ESPIPE;	if (!access_ok(VERIFY_WRITE, buffer, count))		return -EFAULT;	if (midi_dev->mistate == MIDIIN_STATE_STOPPED) {		if (emu10k1_mpuin_start(midi_dev->card) < 0) {			ERROR();			return -EINVAL;		}		midi_dev->mistate = MIDIIN_STATE_STARTED;	}	while (count > 0) {		cnt = MIDIIN_BUFLEN - midi_dev->ird;		spin_lock_irqsave(&midi_spinlock, flags);		if (midi_dev->icnt < cnt)			cnt = midi_dev->icnt;		spin_unlock_irqrestore(&midi_spinlock, flags);		if (cnt > count)			cnt = count;		if (cnt <= 0) {			if (file->f_flags & O_NONBLOCK)				return ret ? ret : -EAGAIN;			DPF(2, " Go to sleep...\n");			interruptible_sleep_on(&midi_dev->iWait);			if (signal_pending(current))				return ret ? ret : -ERESTARTSYS;			continue;		}		if (copy_to_user(buffer, midi_dev->iBuf + midi_dev->ird, cnt)) {			ERROR();			return ret ? ret : -EFAULT;		}		midi_dev->ird += cnt;		midi_dev->ird %= MIDIIN_BUFLEN;		spin_lock_irqsave(&midi_spinlock, flags);		midi_dev->icnt -= cnt;		spin_unlock_irqrestore(&midi_spinlock, flags);		count -= cnt;		buffer += cnt;		ret += cnt;		if (midi_dev->icnt == 0)			break;	}	return ret;}static ssize_t emu10k1_midi_write(struct file *file, const char *buffer, size_t count, loff_t * pos){	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;	struct midi_hdr *midihdr;	ssize_t ret = 0;	unsigned long flags;	DPD(4, "emu10k1_midi_write(), count=%x\n", (u32) count);	if (pos != &file->f_pos)		return -ESPIPE;	if (!access_ok(VERIFY_READ, buffer, count))		return -EFAULT;	if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr *), GFP_KERNEL)) == NULL)		return -EINVAL;	midihdr->bufferlength = count;	midihdr->bytesrecorded = 0;	midihdr->flags = 0;	if ((midihdr->data = (u8 *) kmalloc(count, GFP_KERNEL)) == NULL) {		ERROR();		kfree(midihdr);		return -EINVAL;	}	if (copy_from_user(midihdr->data, buffer, count)) {		kfree(midihdr->data);		kfree(midihdr);		return ret ? ret : -EFAULT;	}	spin_lock_irqsave(&midi_spinlock, flags);	if (emu10k1_mpuout_add_buffer(midi_dev->card, midihdr) < 0) {		ERROR();		kfree(midihdr->data);		kfree(midihdr);		spin_unlock_irqrestore(&midi_spinlock, flags);		return -EINVAL;	}	spin_unlock_irqrestore(&midi_spinlock, flags);	return count;}static unsigned int emu10k1_midi_poll(struct file *file, struct poll_table_struct *wait){	DPF(4, "emu10k1_midi_poll() called\n");	return 0;}int emu10k1_midi_callback(unsigned long msg, unsigned long refdata, unsigned long *pmsg){	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) refdata;	struct midi_hdr *midihdr = NULL;	unsigned long flags;	int i;	DPF(4, "emu10k1_midi_callback()\n");	spin_lock_irqsave(&midi_spinlock, flags);	switch (msg) {	case ICARDMIDI_OUTLONGDATA:		midihdr = (struct midi_hdr *) pmsg[2];		kfree(midihdr->data);		kfree(midihdr);		wake_up_interruptible(&midi_dev->oWait);		break;	case ICARDMIDI_INLONGDATA:		midihdr = (struct midi_hdr *) pmsg[2];		for (i = 0; i < midihdr->bytesrecorded; i++) {			midi_dev->iBuf[midi_dev->iwr++] = midihdr->data[i];			midi_dev->iwr %= MIDIIN_BUFLEN;		}		midi_dev->icnt += midihdr->bytesrecorded;		if (midi_dev->mistate == MIDIIN_STATE_STARTED) {			init_midi_hdr(midihdr);			emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr);			wake_up_interruptible(&midi_dev->iWait);		}		break;	case ICARDMIDI_INDATA:		{			u8 *pBuf = (u8 *) & pmsg[1];			u16 bytesvalid = pmsg[2];			for (i = 0; i < bytesvalid; i++) {				midi_dev->iBuf[midi_dev->iwr++] = pBuf[i];				midi_dev->iwr %= MIDIIN_BUFLEN;			}			midi_dev->icnt += bytesvalid;		}		wake_up_interruptible(&midi_dev->iWait);		break;	default:		/* Unknown message */		return -1;	}	spin_unlock_irqrestore(&midi_spinlock, flags);	return 0;}/* MIDI file operations */struct file_operations emu10k1_midi_fops = {        owner:		THIS_MODULE,	read:		emu10k1_midi_read,	write:		emu10k1_midi_write,	poll:		emu10k1_midi_poll,	open:		emu10k1_midi_open,	release:	emu10k1_midi_release,};