[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / oss / midibuf.c

/*
 * sound/oss/midibuf.c
 *
 * Device file manager for /dev/midi#
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
/*
 * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
 */
#include <linux/stddef.h>
#include <linux/kmod.h>
#include <linux/spinlock.h>
#define MIDIBUF_C

#include "sound_config.h"


/*
 * Don't make MAX_QUEUE_SIZE larger than 4000
 */

#define MAX_QUEUE_SIZE	4000

static wait_queue_head_t midi_sleeper[MAX_MIDI_DEV];
static wait_queue_head_t input_sleeper[MAX_MIDI_DEV];

struct midi_buf
{
	int len, head, tail;
	unsigned char queue[MAX_QUEUE_SIZE];
};

struct midi_parms
{
	long prech_timeout;	/*
				 * Timeout before the first ch
				 */
};

static struct midi_buf *midi_out_buf[MAX_MIDI_DEV] = {NULL};
static struct midi_buf *midi_in_buf[MAX_MIDI_DEV] = {NULL};
static struct midi_parms parms[MAX_MIDI_DEV];

static void midi_poll(unsigned long dummy);


static DEFINE_TIMER(poll_timer, midi_poll, 0, 0);

static volatile int open_devs;
static DEFINE_SPINLOCK(lock);

#define DATA_AVAIL(q) (q->len)
#define SPACE_AVAIL(q) (MAX_QUEUE_SIZE - q->len)

#define QUEUE_BYTE(q, data) \
	if (SPACE_AVAIL(q)) \
	{ \
	  unsigned long flags; \
	  spin_lock_irqsave(&lock, flags); \
	  q->queue[q->tail] = (data); \
	  q->len++; q->tail = (q->tail+1) % MAX_QUEUE_SIZE; \
	  spin_unlock_irqrestore(&lock, flags); \
	}

#define REMOVE_BYTE(q, data) \
	if (DATA_AVAIL(q)) \
	{ \
	  unsigned long flags; \
	  spin_lock_irqsave(&lock, flags); \
	  data = q->queue[q->head]; \
	  q->len--; q->head = (q->head+1) % MAX_QUEUE_SIZE; \
	  spin_unlock_irqrestore(&lock, flags); \
	}

static void drain_midi_queue(int dev)
{

	/*
	 * Give the Midi driver time to drain its output queues
	 */

	if (midi_devs[dev]->buffer_status != NULL)
		while (!signal_pending(current) && midi_devs[dev]->buffer_status(dev)) 
			interruptible_sleep_on_timeout(&midi_sleeper[dev],
						       HZ/10);
}

static void midi_input_intr(int dev, unsigned char data)
{
	if (midi_in_buf[dev] == NULL)
		return;

	if (data == 0xfe)	/*
				 * Active sensing
				 */
		return;		/*
				 * Ignore
				 */

	if (SPACE_AVAIL(midi_in_buf[dev])) {
		QUEUE_BYTE(midi_in_buf[dev], data);
		wake_up(&input_sleeper[dev]);
	}
}

static void midi_output_intr(int dev)
{
	/*
	 * Currently NOP
	 */
}

static void midi_poll(unsigned long dummy)
{
	unsigned long   flags;
	int             dev;

	spin_lock_irqsave(&lock, flags);
	if (open_devs)
	{
		for (dev = 0; dev < num_midis; dev++)
			if (midi_devs[dev] != NULL && midi_out_buf[dev] != NULL)
			{
				while (DATA_AVAIL(midi_out_buf[dev]))
				{
					int ok;
					int c = midi_out_buf[dev]->queue[midi_out_buf[dev]->head];

					spin_unlock_irqrestore(&lock,flags);/* Give some time to others */
					ok = midi_devs[dev]->outputc(dev, c);
					spin_lock_irqsave(&lock, flags);
					if (!ok)
						break;
					midi_out_buf[dev]->head = (midi_out_buf[dev]->head + 1) % MAX_QUEUE_SIZE;
					midi_out_buf[dev]->len--;
				}

				if (DATA_AVAIL(midi_out_buf[dev]) < 100)
					wake_up(&midi_sleeper[dev]);
			}
		poll_timer.expires = (1) + jiffies;
		add_timer(&poll_timer);
		/*
		 * Come back later
		 */
	}
	spin_unlock_irqrestore(&lock, flags);
}

int MIDIbuf_open(int dev, struct file *file)
{
	int mode, err;

	dev = dev >> 4;
	mode = translate_mode(file);

	if (num_midis > MAX_MIDI_DEV)
	{
		printk(KERN_ERR "midi: Too many midi interfaces\n");
		num_midis = MAX_MIDI_DEV;
	}
	if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
		  return -ENXIO;
	/*
	 *    Interrupts disabled. Be careful
	 */

	module_put(midi_devs[dev]->owner);

	if ((err = midi_devs[dev]->open(dev, mode,
				 midi_input_intr, midi_output_intr)) < 0)
		return err;

	parms[dev].prech_timeout = MAX_SCHEDULE_TIMEOUT;
	midi_in_buf[dev] = vmalloc(sizeof(struct midi_buf));

	if (midi_in_buf[dev] == NULL)
	{
		printk(KERN_WARNING "midi: Can't allocate buffer\n");
		midi_devs[dev]->close(dev);
		return -EIO;
	}
	midi_in_buf[dev]->len = midi_in_buf[dev]->head = midi_in_buf[dev]->tail = 0;

	midi_out_buf[dev] = vmalloc(sizeof(struct midi_buf));

	if (midi_out_buf[dev] == NULL)
	{
		printk(KERN_WARNING "midi: Can't allocate buffer\n");
		midi_devs[dev]->close(dev);
		vfree(midi_in_buf[dev]);
		midi_in_buf[dev] = NULL;
		return -EIO;
	}
	midi_out_buf[dev]->len = midi_out_buf[dev]->head = midi_out_buf[dev]->tail = 0;
	open_devs++;

	init_waitqueue_head(&midi_sleeper[dev]);
	init_waitqueue_head(&input_sleeper[dev]);

	if (open_devs < 2)	/* This was first open */
	{
		poll_timer.expires = 1 + jiffies;
		add_timer(&poll_timer);	/* Start polling */
	}
	return err;
}

void MIDIbuf_release(int dev, struct file *file)
{
	int mode;

	dev = dev >> 4;
	mode = translate_mode(file);

	if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
		return;

	/*
	 * Wait until the queue is empty
	 */

	if (mode != OPEN_READ)
	{
		midi_devs[dev]->outputc(dev, 0xfe);	/*
							   * Active sensing to shut the
							   * devices
							 */

		while (!signal_pending(current) && DATA_AVAIL(midi_out_buf[dev]))
			  interruptible_sleep_on(&midi_sleeper[dev]);
		/*
		 *	Sync
		 */

		drain_midi_queue(dev);	/*
					 * Ensure the output queues are empty
					 */
	}

	midi_devs[dev]->close(dev);

	open_devs--;
	if (open_devs == 0)
		del_timer_sync(&poll_timer);
	vfree(midi_in_buf[dev]);
	vfree(midi_out_buf[dev]);
	midi_in_buf[dev] = NULL;
	midi_out_buf[dev] = NULL;

	module_put(midi_devs[dev]->owner);
}

int MIDIbuf_write(int dev, struct file *file, const char __user *buf, int count)
{
	int c, n, i;
	unsigned char tmp_data;

	dev = dev >> 4;

	if (!count)
		return 0;

	c = 0;

	while (c < count)
	{
		n = SPACE_AVAIL(midi_out_buf[dev]);

		if (n == 0) {	/*
				 * No space just now.
				 */

			if (file->f_flags & O_NONBLOCK) {
				c = -EAGAIN;
				goto out;
			}

			interruptible_sleep_on(&midi_sleeper[dev]);
			if (signal_pending(current)) 
			{
				c = -EINTR;
				goto out;
			}
			n = SPACE_AVAIL(midi_out_buf[dev]);
		}
		if (n > (count - c))
			n = count - c;

		for (i = 0; i < n; i++)
		{
			/* BROKE BROKE BROKE - CAN'T DO THIS WITH CLI !! */
			/* yes, think the same, so I removed the cli() brackets 
				QUEUE_BYTE is protected against interrupts */
			if (copy_from_user((char *) &tmp_data, &(buf)[c], 1)) {
				c = -EFAULT;
				goto out;
			}
			QUEUE_BYTE(midi_out_buf[dev], tmp_data);
			c++;
		}
	}
out:
	return c;
}


int MIDIbuf_read(int dev, struct file *file, char __user *buf, int count)
{
	int n, c = 0;
	unsigned char tmp_data;

	dev = dev >> 4;

	if (!DATA_AVAIL(midi_in_buf[dev])) {	/*
						 * No data yet, wait
						 */
 		if (file->f_flags & O_NONBLOCK) {
 			c = -EAGAIN;
			goto out;
 		}
		interruptible_sleep_on_timeout(&input_sleeper[dev],
					       parms[dev].prech_timeout);

		if (signal_pending(current))
			c = -EINTR;	/* The user is getting restless */
	}
	if (c == 0 && DATA_AVAIL(midi_in_buf[dev]))	/*
							 * Got some bytes
							 */
	{
		n = DATA_AVAIL(midi_in_buf[dev]);
		if (n > count)
			n = count;
		c = 0;

		while (c < n)
		{
			char *fixit;
			REMOVE_BYTE(midi_in_buf[dev], tmp_data);
			fixit = (char *) &tmp_data;
			/* BROKE BROKE BROKE */
			/* yes removed the cli() brackets again
			 should q->len,tail&head be atomic_t? */
			if (copy_to_user(&(buf)[c], fixit, 1)) {
				c = -EFAULT;
				goto out;
			}
			c++;
		}
	}
out:
	return c;
}

int MIDIbuf_ioctl(int dev, struct file *file,
		  unsigned int cmd, void __user *arg)
{
	int val;

	dev = dev >> 4;
	
	if (((cmd >> 8) & 0xff) == 'C') 
	{
		if (midi_devs[dev]->coproc)	/* Coprocessor ioctl */
			return midi_devs[dev]->coproc->ioctl(midi_devs[dev]->coproc->devc, cmd, arg, 0);
/*		printk("/dev/midi%d: No coprocessor for this device\n", dev);*/
		return -ENXIO;
	}
	else
	{
		switch (cmd) 
		{
			case SNDCTL_MIDI_PRETIME:
				if (get_user(val, (int __user *)arg))
					return -EFAULT;
				if (val < 0)
					val = 0;
				val = (HZ * val) / 10;
				parms[dev].prech_timeout = val;
				return put_user(val, (int __user *)arg);
			
			default:
				if (!midi_devs[dev]->ioctl)
					return -EINVAL;
				return midi_devs[dev]->ioctl(dev, cmd, arg);
		}
	}
}

/* No kernel lock - fine */
unsigned int MIDIbuf_poll(int dev, struct file *file, poll_table * wait)
{
	unsigned int mask = 0;

	dev = dev >> 4;

	/* input */
	poll_wait(file, &input_sleeper[dev], wait);
	if (DATA_AVAIL(midi_in_buf[dev]))
		mask |= POLLIN | POLLRDNORM;

	/* output */
	poll_wait(file, &midi_sleeper[dev], wait);
	if (!SPACE_AVAIL(midi_out_buf[dev]))
		mask |= POLLOUT | POLLWRNORM;
	
	return mask;
}


int MIDIbuf_avail(int dev)
{
	if (midi_in_buf[dev])
		return DATA_AVAIL (midi_in_buf[dev]);
	return 0;
}
EXPORT_SYMBOL(MIDIbuf_avail);
Commit	Line	Data
1da177e4	1	/*
f30c2269	2	* sound/oss/midibuf.c
1da177e4 LT	3	*
	4	* Device file manager for /dev/midi#
	5	*/
	6	/*
	7	* Copyright (C) by Hannu Savolainen 1993-1997
	8	*
	9	* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
	10	* Version 2 (June 1991). See the "COPYING" file distributed with this software
	11	* for more info.
	12	*/
	13	/*
	14	* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
	15	*/
	16	#include <linux/stddef.h>
	17	#include <linux/kmod.h>
	18	#include <linux/spinlock.h>
	19	#define MIDIBUF_C
	20
	21	#include "sound_config.h"
	22
	23
	24	/*
	25	* Don't make MAX_QUEUE_SIZE larger than 4000
	26	*/
	27
	28	#define MAX_QUEUE_SIZE 4000
	29
	30	static wait_queue_head_t midi_sleeper[MAX_MIDI_DEV];
	31	static wait_queue_head_t input_sleeper[MAX_MIDI_DEV];
	32
	33	struct midi_buf
	34	{
	35	int len, head, tail;
	36	unsigned char queue[MAX_QUEUE_SIZE];
	37	};
	38
	39	struct midi_parms
	40	{
	41	long prech_timeout; /*
	42	* Timeout before the first ch
	43	*/
	44	};
	45
	46	static struct midi_buf *midi_out_buf[MAX_MIDI_DEV] = {NULL};
	47	static struct midi_buf *midi_in_buf[MAX_MIDI_DEV] = {NULL};
	48	static struct midi_parms parms[MAX_MIDI_DEV];
	49
	50	static void midi_poll(unsigned long dummy);
	51
	52
8d06afab	53	static DEFINE_TIMER(poll_timer, midi_poll, 0, 0);
1da177e4 LT	54
	55	static volatile int open_devs;
	56	static DEFINE_SPINLOCK(lock);
	57
	58	#define DATA_AVAIL(q) (q->len)
	59	#define SPACE_AVAIL(q) (MAX_QUEUE_SIZE - q->len)
	60
	61	#define QUEUE_BYTE(q, data) \
	62	if (SPACE_AVAIL(q)) \
	63	{ \
	64	unsigned long flags; \
	65	spin_lock_irqsave(&lock, flags); \
	66	q->queue[q->tail] = (data); \
	67	q->len++; q->tail = (q->tail+1) % MAX_QUEUE_SIZE; \
	68	spin_unlock_irqrestore(&lock, flags); \
	69	}
	70
	71	#define REMOVE_BYTE(q, data) \
	72	if (DATA_AVAIL(q)) \
	73	{ \
	74	unsigned long flags; \
	75	spin_lock_irqsave(&lock, flags); \
	76	data = q->queue[q->head]; \
	77	q->len--; q->head = (q->head+1) % MAX_QUEUE_SIZE; \
	78	spin_unlock_irqrestore(&lock, flags); \
	79	}
	80
	81	static void drain_midi_queue(int dev)
	82	{
	83
	84	/*
	85	* Give the Midi driver time to drain its output queues
	86	*/
	87
	88	if (midi_devs[dev]->buffer_status != NULL)
	89	while (!signal_pending(current) && midi_devs[dev]->buffer_status(dev))
	90	interruptible_sleep_on_timeout(&midi_sleeper[dev],
	91	HZ/10);
	92	}
	93
	94	static void midi_input_intr(int dev, unsigned char data)
	95	{
	96	if (midi_in_buf[dev] == NULL)
	97	return;
	98
	99	if (data == 0xfe) /*
	100	* Active sensing
	101	*/
	102	return; /*
	103	* Ignore
	104	*/
	105
	106	if (SPACE_AVAIL(midi_in_buf[dev])) {
	107	QUEUE_BYTE(midi_in_buf[dev], data);
	108	wake_up(&input_sleeper[dev]);
	109	}
	110	}
	111
	112	static void midi_output_intr(int dev)
	113	{
	114	/*
	115	* Currently NOP
	116	*/
	117	}
118
119	static void midi_poll(unsigned long dummy)
120	{
121	unsigned long flags;
122	int dev;
123
124	spin_lock_irqsave(&lock, flags);
125	if (open_devs)
126	{
127	for (dev = 0; dev < num_midis; dev++)
128	if (midi_devs[dev] != NULL && midi_out_buf[dev] != NULL)
129	{
5e8e7c38	130	while (DATA_AVAIL(midi_out_buf[dev]))
1da177e4	131	{
5e8e7c38	132	int ok;
1da177e4 LT	133	int c = midi_out_buf[dev]->queue[midi_out_buf[dev]->head];
	134
	135	spin_unlock_irqrestore(&lock,flags);/* Give some time to others */
	136	ok = midi_devs[dev]->outputc(dev, c);
	137	spin_lock_irqsave(&lock, flags);
5e8e7c38 CL	138	if (!ok)
5e8e7c38 CL	139	break;
1da177e4 LT	140	midi_out_buf[dev]->head = (midi_out_buf[dev]->head + 1) % MAX_QUEUE_SIZE;
	141	midi_out_buf[dev]->len--;
	142	}
	143
	144	if (DATA_AVAIL(midi_out_buf[dev]) < 100)
	145	wake_up(&midi_sleeper[dev]);
	146	}
	147	poll_timer.expires = (1) + jiffies;
	148	add_timer(&poll_timer);
	149	/*
	150	* Come back later
	151	*/
	152	}
	153	spin_unlock_irqrestore(&lock, flags);
	154	}
	155
	156	int MIDIbuf_open(int dev, struct file *file)
	157	{
	158	int mode, err;
	159
	160	dev = dev >> 4;
	161	mode = translate_mode(file);
	162
	163	if (num_midis > MAX_MIDI_DEV)
	164	{
	165	printk(KERN_ERR "midi: Too many midi interfaces\n");
	166	num_midis = MAX_MIDI_DEV;
	167	}
	168	if (dev < 0 \|\| dev >= num_midis \|\| midi_devs[dev] == NULL)
	169	return -ENXIO;
	170	/*
	171	* Interrupts disabled. Be careful
	172	*/
	173
	174	module_put(midi_devs[dev]->owner);
	175
	176	if ((err = midi_devs[dev]->open(dev, mode,
	177	midi_input_intr, midi_output_intr)) < 0)
	178	return err;
	179
	180	parms[dev].prech_timeout = MAX_SCHEDULE_TIMEOUT;
ea7dd251	181	midi_in_buf[dev] = vmalloc(sizeof(struct midi_buf));
1da177e4 LT	182
	183	if (midi_in_buf[dev] == NULL)
	184	{
	185	printk(KERN_WARNING "midi: Can't allocate buffer\n");
	186	midi_devs[dev]->close(dev);
	187	return -EIO;
	188	}
	189	midi_in_buf[dev]->len = midi_in_buf[dev]->head = midi_in_buf[dev]->tail = 0;
	190
ea7dd251	191	midi_out_buf[dev] = vmalloc(sizeof(struct midi_buf));
1da177e4 LT	192
	193	if (midi_out_buf[dev] == NULL)
	194	{
	195	printk(KERN_WARNING "midi: Can't allocate buffer\n");
	196	midi_devs[dev]->close(dev);
	197	vfree(midi_in_buf[dev]);
	198	midi_in_buf[dev] = NULL;
	199	return -EIO;
	200	}
	201	midi_out_buf[dev]->len = midi_out_buf[dev]->head = midi_out_buf[dev]->tail = 0;
	202	open_devs++;
	203
	204	init_waitqueue_head(&midi_sleeper[dev]);
	205	init_waitqueue_head(&input_sleeper[dev]);
	206
	207	if (open_devs < 2) /* This was first open */
	208	{
	209	poll_timer.expires = 1 + jiffies;
	210	add_timer(&poll_timer); /* Start polling */
	211	}
	212	return err;
	213	}
	214
	215	void MIDIbuf_release(int dev, struct file *file)
	216	{
	217	int mode;
	218
	219	dev = dev >> 4;
	220	mode = translate_mode(file);
	221
	222	if (dev < 0 \|\| dev >= num_midis \|\| midi_devs[dev] == NULL)
	223	return;
	224
	225	/*
	226	* Wait until the queue is empty
	227	*/
	228
	229	if (mode != OPEN_READ)
	230	{
	231	midi_devs[dev]->outputc(dev, 0xfe); /*
	232	* Active sensing to shut the
	233	* devices
	234	*/
	235
	236	while (!signal_pending(current) && DATA_AVAIL(midi_out_buf[dev]))
	237	interruptible_sleep_on(&midi_sleeper[dev]);
	238	/*
	239	* Sync
	240	*/
	241
	242	drain_midi_queue(dev); /*
	243	* Ensure the output queues are empty
	244	*/
	245	}
	246
	247	midi_devs[dev]->close(dev);
	248
	249	open_devs--;
	250	if (open_devs == 0)
	251	del_timer_sync(&poll_timer);
	252	vfree(midi_in_buf[dev]);
	253	vfree(midi_out_buf[dev]);
	254	midi_in_buf[dev] = NULL;
	255	midi_out_buf[dev] = NULL;
256
257	module_put(midi_devs[dev]->owner);
258	}
259
260	int MIDIbuf_write(int dev, struct file file, const char __user buf, int count)
261	{
262	int c, n, i;
263	unsigned char tmp_data;
264
265	dev = dev >> 4;
266
267	if (!count)
268	return 0;
269
270	c = 0;
271
272	while (c < count)
273	{
274	n = SPACE_AVAIL(midi_out_buf[dev]);
275
276	if (n == 0) { /*
277	* No space just now.
278	*/
279
280	if (file->f_flags & O_NONBLOCK) {
281	c = -EAGAIN;
282	goto out;
283	}
284
285	interruptible_sleep_on(&midi_sleeper[dev]);
286	if (signal_pending(current))
287	{
288	c = -EINTR;
289	goto out;
290	}
291	n = SPACE_AVAIL(midi_out_buf[dev]);
292	}
293	if (n > (count - c))
294	n = count - c;
295
296	for (i = 0; i < n; i++)
297	{
25985edc	298	/* BROKE BROKE BROKE - CAN'T DO THIS WITH CLI !! */
1da177e4 LT	299	/* yes, think the same, so I removed the cli() brackets
	300	QUEUE_BYTE is protected against interrupts */
	301	if (copy_from_user((char *) &tmp_data, &(buf)[c], 1)) {
	302	c = -EFAULT;
	303	goto out;
	304	}
	305	QUEUE_BYTE(midi_out_buf[dev], tmp_data);
	306	c++;
	307	}
	308	}
	309	out:
	310	return c;
	311	}
	312
	313
	314	int MIDIbuf_read(int dev, struct file file, char __user buf, int count)
	315	{
	316	int n, c = 0;
	317	unsigned char tmp_data;
	318
	319	dev = dev >> 4;
	320
	321	if (!DATA_AVAIL(midi_in_buf[dev])) { /*
	322	* No data yet, wait
	323	*/
	324	if (file->f_flags & O_NONBLOCK) {
	325	c = -EAGAIN;
	326	goto out;
	327	}
	328	interruptible_sleep_on_timeout(&input_sleeper[dev],
	329	parms[dev].prech_timeout);
	330
	331	if (signal_pending(current))
	332	c = -EINTR; /* The user is getting restless */
	333	}
	334	if (c == 0 && DATA_AVAIL(midi_in_buf[dev])) /*
	335	* Got some bytes
	336	*/
	337	{
	338	n = DATA_AVAIL(midi_in_buf[dev]);
	339	if (n > count)
	340	n = count;
	341	c = 0;
	342
	343	while (c < n)
	344	{
	345	char *fixit;
	346	REMOVE_BYTE(midi_in_buf[dev], tmp_data);
	347	fixit = (char *) &tmp_data;
	348	/* BROKE BROKE BROKE */
	349	/* yes removed the cli() brackets again
	350	should q->len,tail&head be atomic_t? */
	351	if (copy_to_user(&(buf)[c], fixit, 1)) {
	352	c = -EFAULT;
	353	goto out;
	354	}
	355	c++;
	356	}
	357	}
	358	out:
	359	return c;
	360	}
	361
	362	int MIDIbuf_ioctl(int dev, struct file *file,
363	unsigned int cmd, void __user *arg)
364	{
365	int val;
366
367	dev = dev >> 4;
368
369	if (((cmd >> 8) & 0xff) == 'C')
370	{
371	if (midi_devs[dev]->coproc) /* Coprocessor ioctl */
372	return midi_devs[dev]->coproc->ioctl(midi_devs[dev]->coproc->devc, cmd, arg, 0);
373	/* printk("/dev/midi%d: No coprocessor for this device\n", dev);*/
374	return -ENXIO;
375	}
376	else
377	{
378	switch (cmd)
379	{
380	case SNDCTL_MIDI_PRETIME:
381	if (get_user(val, (int __user *)arg))
382	return -EFAULT;
383	if (val < 0)
384	val = 0;
385	val = (HZ * val) / 10;
386	parms[dev].prech_timeout = val;
387	return put_user(val, (int __user *)arg);
388
389	default:
390	if (!midi_devs[dev]->ioctl)
391	return -EINVAL;
392	return midi_devs[dev]->ioctl(dev, cmd, arg);
393	}
394	}
395	}
396
397	/* No kernel lock - fine */
398	unsigned int MIDIbuf_poll(int dev, struct file file, poll_table wait)
399	{
400	unsigned int mask = 0;
401
402	dev = dev >> 4;
403
404	/* input */
405	poll_wait(file, &input_sleeper[dev], wait);
406	if (DATA_AVAIL(midi_in_buf[dev]))
407	mask \|= POLLIN \| POLLRDNORM;
408
409	/* output */
410	poll_wait(file, &midi_sleeper[dev], wait);
411	if (!SPACE_AVAIL(midi_out_buf[dev]))
412	mask \|= POLLOUT \| POLLWRNORM;
413
414	return mask;
415	}
416
417
1da177e4 LT	418	int MIDIbuf_avail(int dev)
	419	{
	420	if (midi_in_buf[dev])
	421	return DATA_AVAIL (midi_in_buf[dev]);
	422	return 0;
	423	}
ece7f77b AB	424	EXPORT_SYMBOL(MIDIbuf_avail);
ece7f77b AB	425