/*
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* OSS compatible sequencer driver
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*
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* read/write/select interface to device file
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*
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* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
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*
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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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*
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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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*
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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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*/
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#include "seq_oss_device.h"
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#include "seq_oss_readq.h"
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#include "seq_oss_writeq.h"
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#include "seq_oss_synth.h"
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#include <sound/seq_oss_legacy.h>
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#include "seq_oss_event.h"
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#include "seq_oss_timer.h"
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#include "../seq_clientmgr.h"
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/*
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* protoypes
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*/
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static int insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt);
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/*
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* read interface
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*/
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int
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snd_seq_oss_read(struct seq_oss_devinfo *dp, char __user *buf, int count)
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{
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struct seq_oss_readq *readq = dp->readq;
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int result = 0, err = 0;
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int ev_len;
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union evrec rec;
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unsigned long flags;
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if (readq == NULL || ! is_read_mode(dp->file_mode))
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return -ENXIO;
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while (count >= SHORT_EVENT_SIZE) {
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snd_seq_oss_readq_lock(readq, flags);
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err = snd_seq_oss_readq_pick(readq, &rec);
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if (err == -EAGAIN &&
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!is_nonblock_mode(dp->file_mode) && result == 0) {
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snd_seq_oss_readq_unlock(readq, flags);
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snd_seq_oss_readq_wait(readq);
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snd_seq_oss_readq_lock(readq, flags);
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if (signal_pending(current))
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err = -ERESTARTSYS;
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else
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err = snd_seq_oss_readq_pick(readq, &rec);
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}
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if (err < 0) {
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snd_seq_oss_readq_unlock(readq, flags);
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break;
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}
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ev_len = ev_length(&rec);
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if (ev_len < count) {
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snd_seq_oss_readq_unlock(readq, flags);
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break;
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}
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snd_seq_oss_readq_free(readq);
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snd_seq_oss_readq_unlock(readq, flags);
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if (copy_to_user(buf, &rec, ev_len)) {
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err = -EFAULT;
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break;
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}
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result += ev_len;
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buf += ev_len;
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count -= ev_len;
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}
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return result > 0 ? result : err;
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}
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/*
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* write interface
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*/
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int
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snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count, struct file *opt)
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{
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int result = 0, err = 0;
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int ev_size, fmt;
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union evrec rec;
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if (! is_write_mode(dp->file_mode) || dp->writeq == NULL)
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return -ENXIO;
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while (count >= SHORT_EVENT_SIZE) {
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if (copy_from_user(&rec, buf, SHORT_EVENT_SIZE)) {
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err = -EFAULT;
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break;
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}
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if (rec.s.code == SEQ_FULLSIZE) {
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/* load patch */
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if (result > 0) {
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err = -EINVAL;
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break;
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}
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fmt = (*(unsigned short *)rec.c) & 0xffff;
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/* FIXME the return value isn't correct */
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return snd_seq_oss_synth_load_patch(dp, rec.s.dev,
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fmt, buf, 0, count);
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}
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if (ev_is_long(&rec)) {
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/* extended code */
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if (rec.s.code == SEQ_EXTENDED &&
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dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
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err = -EINVAL;
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break;
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}
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ev_size = LONG_EVENT_SIZE;
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if (count < ev_size)
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break;
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/* copy the reset 4 bytes */
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if (copy_from_user(rec.c + SHORT_EVENT_SIZE,
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buf + SHORT_EVENT_SIZE,
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LONG_EVENT_SIZE - SHORT_EVENT_SIZE)) {
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err = -EFAULT;
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break;
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}
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} else {
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/* old-type code */
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if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
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err = -EINVAL;
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break;
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}
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ev_size = SHORT_EVENT_SIZE;
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}
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/* insert queue */
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if ((err = insert_queue(dp, &rec, opt)) < 0)
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break;
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result += ev_size;
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buf += ev_size;
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count -= ev_size;
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}
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return result > 0 ? result : err;
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}
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/*
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* insert event record to write queue
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* return: 0 = OK, non-zero = NG
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*/
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static int
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insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)
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{
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int rc = 0;
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struct snd_seq_event event;
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/* if this is a timing event, process the current time */
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if (snd_seq_oss_process_timer_event(dp->timer, rec))
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return 0; /* no need to insert queue */
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/* parse this event */
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memset(&event, 0, sizeof(event));
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/* set dummy -- to be sure */
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event.type = SNDRV_SEQ_EVENT_NOTEOFF;
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snd_seq_oss_fill_addr(dp, &event, dp->addr.client, dp->addr.port);
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if (snd_seq_oss_process_event(dp, rec, &event))
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return 0; /* invalid event - no need to insert queue */
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event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
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if (dp->timer->realtime || !dp->timer->running) {
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snd_seq_oss_dispatch(dp, &event, 0, 0);
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} else {
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if (is_nonblock_mode(dp->file_mode))
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rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, 0, 0);
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else
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rc = snd_seq_kernel_client_enqueue_blocking(dp->cseq, &event, opt, 0, 0);
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}
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return rc;
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}
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/*
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* select / poll
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*/
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__poll_t
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snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait)
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{
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__poll_t mask = 0;
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/* input */
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if (dp->readq && is_read_mode(dp->file_mode)) {
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if (snd_seq_oss_readq_poll(dp->readq, file, wait))
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mask |= EPOLLIN | EPOLLRDNORM;
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}
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/* output */
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if (dp->writeq && is_write_mode(dp->file_mode)) {
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if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait))
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mask |= EPOLLOUT | EPOLLWRNORM;
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}
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return mask;
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}
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