[mirror_ubuntu-focal-kernel.git] / sound / core / seq / oss / seq_oss_rw.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OSS compatible sequencer driver
 *
 * read/write/select interface to device file
 *
 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
 */

#include "seq_oss_device.h"
#include "seq_oss_readq.h"
#include "seq_oss_writeq.h"
#include "seq_oss_synth.h"
#include <sound/seq_oss_legacy.h>
#include "seq_oss_event.h"
#include "seq_oss_timer.h"
#include "../seq_clientmgr.h"


/*
 * protoypes
 */
static int insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt);


/*
 * read interface
 */

int
snd_seq_oss_read(struct seq_oss_devinfo *dp, char __user *buf, int count)
{
	struct seq_oss_readq *readq = dp->readq;
	int result = 0, err = 0;
	int ev_len;
	union evrec rec;
	unsigned long flags;

	if (readq == NULL || ! is_read_mode(dp->file_mode))
		return -ENXIO;

	while (count >= SHORT_EVENT_SIZE) {
		snd_seq_oss_readq_lock(readq, flags);
		err = snd_seq_oss_readq_pick(readq, &rec);
		if (err == -EAGAIN &&
		    !is_nonblock_mode(dp->file_mode) && result == 0) {
			snd_seq_oss_readq_unlock(readq, flags);
			snd_seq_oss_readq_wait(readq);
			snd_seq_oss_readq_lock(readq, flags);
			if (signal_pending(current))
				err = -ERESTARTSYS;
			else
				err = snd_seq_oss_readq_pick(readq, &rec);
		}
		if (err < 0) {
			snd_seq_oss_readq_unlock(readq, flags);
			break;
		}
		ev_len = ev_length(&rec);
		if (ev_len < count) {
			snd_seq_oss_readq_unlock(readq, flags);
			break;
		}
		snd_seq_oss_readq_free(readq);
		snd_seq_oss_readq_unlock(readq, flags);
		if (copy_to_user(buf, &rec, ev_len)) {
			err = -EFAULT;
			break;
		}
		result += ev_len;
		buf += ev_len;
		count -= ev_len;
	}
	return result > 0 ? result : err;
}


/*
 * write interface
 */

int
snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count, struct file *opt)
{
	int result = 0, err = 0;
	int ev_size, fmt;
	union evrec rec;

	if (! is_write_mode(dp->file_mode) || dp->writeq == NULL)
		return -ENXIO;

	while (count >= SHORT_EVENT_SIZE) {
		if (copy_from_user(&rec, buf, SHORT_EVENT_SIZE)) {
			err = -EFAULT;
			break;
		}
		if (rec.s.code == SEQ_FULLSIZE) {
			/* load patch */
			if (result > 0) {
				err = -EINVAL;
				break;
			}
			fmt = (*(unsigned short *)rec.c) & 0xffff;
			/* FIXME the return value isn't correct */
			return snd_seq_oss_synth_load_patch(dp, rec.s.dev,
							    fmt, buf, 0, count);
		}
		if (ev_is_long(&rec)) {
			/* extended code */
			if (rec.s.code == SEQ_EXTENDED &&
			    dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
				err = -EINVAL;
				break;
			}
			ev_size = LONG_EVENT_SIZE;
			if (count < ev_size)
				break;
			/* copy the reset 4 bytes */
			if (copy_from_user(rec.c + SHORT_EVENT_SIZE,
					   buf + SHORT_EVENT_SIZE,
					   LONG_EVENT_SIZE - SHORT_EVENT_SIZE)) {
				err = -EFAULT;
				break;
			}
		} else {
			/* old-type code */
			if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
				err = -EINVAL;
				break;
			}
			ev_size = SHORT_EVENT_SIZE;
		}

		/* insert queue */
		if ((err = insert_queue(dp, &rec, opt)) < 0)
			break;

		result += ev_size;
		buf += ev_size;
		count -= ev_size;
	}
	return result > 0 ? result : err;
}


/*
 * insert event record to write queue
 * return: 0 = OK, non-zero = NG
 */
static int
insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)
{
	int rc = 0;
	struct snd_seq_event event;

	/* if this is a timing event, process the current time */
	if (snd_seq_oss_process_timer_event(dp->timer, rec))
		return 0; /* no need to insert queue */

	/* parse this event */
	memset(&event, 0, sizeof(event));
	/* set dummy -- to be sure */
	event.type = SNDRV_SEQ_EVENT_NOTEOFF;
	snd_seq_oss_fill_addr(dp, &event, dp->addr.port, dp->addr.client);

	if (snd_seq_oss_process_event(dp, rec, &event))
		return 0; /* invalid event - no need to insert queue */

	event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
	if (dp->timer->realtime || !dp->timer->running)
		snd_seq_oss_dispatch(dp, &event, 0, 0);
	else
		rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt,
						   !is_nonblock_mode(dp->file_mode));
	return rc;
}
		

/*
 * select / poll
 */
  
__poll_t
snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait)
{
	__poll_t mask = 0;

	/* input */
	if (dp->readq && is_read_mode(dp->file_mode)) {
		if (snd_seq_oss_readq_poll(dp->readq, file, wait))
			mask |= EPOLLIN | EPOLLRDNORM;
	}

	/* output */
	if (dp->writeq && is_write_mode(dp->file_mode)) {
		if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait))
			mask |= EPOLLOUT | EPOLLWRNORM;
	}
	return mask;
}
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* OSS compatible sequencer driver
	4	*
	5	* read/write/select interface to device file
	6	*
	7	* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
1da177e4 LT	8	*/
	9
	10	#include "seq_oss_device.h"
	11	#include "seq_oss_readq.h"
	12	#include "seq_oss_writeq.h"
	13	#include "seq_oss_synth.h"
	14	#include <sound/seq_oss_legacy.h>
	15	#include "seq_oss_event.h"
	16	#include "seq_oss_timer.h"
	17	#include "../seq_clientmgr.h"
	18
	19
	20	/*
	21	* protoypes
	22	*/
080dece3	23	static int insert_queue(struct seq_oss_devinfo dp, union evrec rec, struct file *opt);
1da177e4 LT	24
	25
	26	/*
	27	* read interface
	28	*/
	29
	30	int
080dece3	31	snd_seq_oss_read(struct seq_oss_devinfo dp, char __user buf, int count)
1da177e4	32	{
080dece3	33	struct seq_oss_readq *readq = dp->readq;
1da177e4 LT	34	int result = 0, err = 0;
1da177e4 LT	35	int ev_len;
080dece3	36	union evrec rec;
1da177e4 LT	37	unsigned long flags;
	38
	39	if (readq == NULL \|\| ! is_read_mode(dp->file_mode))
	40	return -ENXIO;
	41
	42	while (count >= SHORT_EVENT_SIZE) {
	43	snd_seq_oss_readq_lock(readq, flags);
	44	err = snd_seq_oss_readq_pick(readq, &rec);
	45	if (err == -EAGAIN &&
	46	!is_nonblock_mode(dp->file_mode) && result == 0) {
	47	snd_seq_oss_readq_unlock(readq, flags);
	48	snd_seq_oss_readq_wait(readq);
	49	snd_seq_oss_readq_lock(readq, flags);
	50	if (signal_pending(current))
	51	err = -ERESTARTSYS;
	52	else
	53	err = snd_seq_oss_readq_pick(readq, &rec);
	54	}
	55	if (err < 0) {
	56	snd_seq_oss_readq_unlock(readq, flags);
	57	break;
	58	}
	59	ev_len = ev_length(&rec);
	60	if (ev_len < count) {
	61	snd_seq_oss_readq_unlock(readq, flags);
	62	break;
	63	}
	64	snd_seq_oss_readq_free(readq);
	65	snd_seq_oss_readq_unlock(readq, flags);
	66	if (copy_to_user(buf, &rec, ev_len)) {
	67	err = -EFAULT;
	68	break;
	69	}
	70	result += ev_len;
	71	buf += ev_len;
	72	count -= ev_len;
	73	}
	74	return result > 0 ? result : err;
	75	}
	76
	77
	78	/*
	79	* write interface
	80	*/
	81
	82	int
080dece3	83	snd_seq_oss_write(struct seq_oss_devinfo dp, const char __user buf, int count, struct file *opt)
1da177e4 LT	84	{
	85	int result = 0, err = 0;
	86	int ev_size, fmt;
080dece3	87	union evrec rec;
1da177e4 LT	88
	89	if (! is_write_mode(dp->file_mode) \|\| dp->writeq == NULL)
	90	return -ENXIO;
	91
	92	while (count >= SHORT_EVENT_SIZE) {
	93	if (copy_from_user(&rec, buf, SHORT_EVENT_SIZE)) {
	94	err = -EFAULT;
	95	break;
	96	}
	97	if (rec.s.code == SEQ_FULLSIZE) {
	98	/* load patch */
	99	if (result > 0) {
	100	err = -EINVAL;
	101	break;
	102	}
	103	fmt = ((unsigned short )rec.c) & 0xffff;
	104	/* FIXME the return value isn't correct */
	105	return snd_seq_oss_synth_load_patch(dp, rec.s.dev,
	106	fmt, buf, 0, count);
	107	}
	108	if (ev_is_long(&rec)) {
	109	/* extended code */
	110	if (rec.s.code == SEQ_EXTENDED &&
	111	dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
	112	err = -EINVAL;
	113	break;
	114	}
	115	ev_size = LONG_EVENT_SIZE;
	116	if (count < ev_size)
	117	break;
	118	/* copy the reset 4 bytes */
	119	if (copy_from_user(rec.c + SHORT_EVENT_SIZE,
	120	buf + SHORT_EVENT_SIZE,
	121	LONG_EVENT_SIZE - SHORT_EVENT_SIZE)) {
	122	err = -EFAULT;
	123	break;
	124	}
	125	} else {
	126	/* old-type code */
	127	if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
	128	err = -EINVAL;
	129	break;
	130	}
	131	ev_size = SHORT_EVENT_SIZE;
	132	}
	133
	134	/* insert queue */
	135	if ((err = insert_queue(dp, &rec, opt)) < 0)
	136	break;
	137
	138	result += ev_size;
	139	buf += ev_size;
	140	count -= ev_size;
	141	}
	142	return result > 0 ? result : err;
	143	}
	144
	145
	146	/*
	147	* insert event record to write queue
	148	* return: 0 = OK, non-zero = NG
	149	*/
	150	static int
080dece3	151	insert_queue(struct seq_oss_devinfo dp, union evrec rec, struct file *opt)
1da177e4 LT	152	{
1da177e4 LT	153	int rc = 0;
080dece3	154	struct snd_seq_event event;
1da177e4 LT	155
	156	/* if this is a timing event, process the current time */
	157	if (snd_seq_oss_process_timer_event(dp->timer, rec))
	158	return 0; /* no need to insert queue */
	159
	160	/* parse this event */
	161	memset(&event, 0, sizeof(event));
	162	/* set dummy -- to be sure */
	163	event.type = SNDRV_SEQ_EVENT_NOTEOFF;
	164	snd_seq_oss_fill_addr(dp, &event, dp->addr.port, dp->addr.client);
	165
	166	if (snd_seq_oss_process_event(dp, rec, &event))
	167	return 0; /* invalid event - no need to insert queue */
	168
	169	event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
6740ea67	170	if (dp->timer->realtime \|\| !dp->timer->running)
1da177e4	171	snd_seq_oss_dispatch(dp, &event, 0, 0);
6740ea67 TI	172	else
	173	rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt,
	174	!is_nonblock_mode(dp->file_mode));
1da177e4 LT	175	return rc;
	176	}
	177
	178
	179	/*
	180	* select / poll
	181	*/
	182
680ef72a	183	__poll_t
080dece3	184	snd_seq_oss_poll(struct seq_oss_devinfo dp, struct file file, poll_table * wait)
1da177e4	185	{
680ef72a	186	__poll_t mask = 0;
1da177e4 LT	187
	188	/* input */
	189	if (dp->readq && is_read_mode(dp->file_mode)) {
	190	if (snd_seq_oss_readq_poll(dp->readq, file, wait))
a9a08845	191	mask \|= EPOLLIN \| EPOLLRDNORM;
1da177e4 LT	192	}
	193
	194	/* output */
	195	if (dp->writeq && is_write_mode(dp->file_mode)) {
	196	if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait))
a9a08845	197	mask \|= EPOLLOUT \| EPOLLWRNORM;
1da177e4 LT	198	}
	199	return mask;
	200	}