patch-2.3.99-pre6 linux/drivers/sound/emu10k1/midi.c

• Lines: 447
• Date: Fri Apr 21 16:08:45 2000
• Orig file: v2.3.99-pre5/linux/drivers/sound/emu10k1/midi.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre5/linux/drivers/sound/emu10k1/midi.c linux/drivers/sound/emu10k1/midi.c
@@ -0,0 +1,446 @@
+
+/*
+ **********************************************************************
+ *     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 <asm/uaccess.h>
+
+#include "hwaccess.h"
+#include "cardmo.h"
+#include "cardmi.h"
+#include "midi.h"
+
+static spinlock_t midi_spinlock = 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 CTSTATUS_ERROR;
+	}
+
+	if (emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr) != CTSTATUS_SUCCESS) {
+		ERROR();
+		kfree(midihdr->data);
+		kfree(midihdr);
+		return CTSTATUS_ERROR;
+	}
+
+	*midihdrptr = midihdr;
+	list_add_tail(&midihdr->list, &midi_dev->mid_hdrs);
+
+	return CTSTATUS_SUCCESS;
+}
+
+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;
+
+	MOD_INC_USE_COUNT;
+
+	/* 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);
+			MOD_DEC_USE_COUNT;
+			return -EBUSY;
+		}
+
+		up(&card->open_sem);
+		interruptible_sleep_on(&card->open_wait);
+
+		if (signal_pending(current)) {
+			MOD_DEC_USE_COUNT;
+			return -ERESTARTSYS;
+		}
+
+		down(&card->open_sem);
+	}
+
+	if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL) {
+		MOD_DEC_USE_COUNT;
+		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)
+		    != CTSTATUS_SUCCESS) {
+			ERROR();
+			kfree(midi_dev);
+			MOD_DEC_USE_COUNT;
+			return -ENODEV;
+		}
+
+		/* Add two buffers to receive sysex buffer */
+		if (midiin_add_buffer(midi_dev, &midihdr1) != CTSTATUS_SUCCESS) {
+			kfree(midi_dev);
+			MOD_DEC_USE_COUNT;
+			return -ENODEV;
+		}
+
+		if (midiin_add_buffer(midi_dev, &midihdr2) != CTSTATUS_SUCCESS) {
+			list_del(&midihdr1->list);
+			kfree(midihdr1->data);
+			kfree(midihdr1);
+			kfree(midi_dev);
+			MOD_DEC_USE_COUNT;
+			return -ENODEV;
+		}
+	}
+
+	if (file->f_mode & FMODE_WRITE) {
+		struct midi_openinfo dsCardMidiOpenInfo;
+
+		dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;
+
+		if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo)
+		    != CTSTATUS_SUCCESS) {
+			ERROR();
+			kfree(midi_dev);
+			MOD_DEC_USE_COUNT;
+			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 = 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);
+
+	MOD_DEC_USE_COUNT;
+
+	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)
+		    != CTSTATUS_SUCCESS) {
+			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) != CTSTATUS_SUCCESS) {
+		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 CTSTATUS_ERROR;
+	}
+
+	spin_unlock_irqrestore(&midi_spinlock, flags);
+
+	return CTSTATUS_SUCCESS;
+}
+
+/* MIDI file operations */
+struct file_operations emu10k1_midi_fops = {
+	read:emu10k1_midi_read,
+	write:emu10k1_midi_write,
+	poll:emu10k1_midi_poll,
+	open:emu10k1_midi_open,
+	release:emu10k1_midi_release,
+};