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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OSS compatible sequencer driver4 *5 * read/write/select interface to device file6 *7 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>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 * protoypes22 */23static int insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt);24 25 26/*27 * read interface28 */29 30int31snd_seq_oss_read(struct seq_oss_devinfo *dp, char __user *buf, int count)32{33 struct seq_oss_readq *readq = dp->readq;34 int result = 0, err = 0;35 int ev_len;36 union evrec rec;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 else53 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 interface80 */81 82int83snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count, struct file *opt)84{85 int result = 0, err = 0;86 int ev_size, fmt;87 union evrec rec;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 err = insert_queue(dp, &rec, opt);136 if (err < 0)137 break;138 139 result += ev_size;140 buf += ev_size;141 count -= ev_size;142 }143 return result > 0 ? result : err;144}145 146 147/*148 * insert event record to write queue149 * return: 0 = OK, non-zero = NG150 */151static int152insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)153{154 int rc = 0;155 struct snd_seq_event event;156 157 /* if this is a timing event, process the current time */158 if (snd_seq_oss_process_timer_event(dp->timer, rec))159 return 0; /* no need to insert queue */160 161 /* parse this event */162 memset(&event, 0, sizeof(event));163 /* set dummy -- to be sure */164 event.type = SNDRV_SEQ_EVENT_NOTEOFF;165 snd_seq_oss_fill_addr(dp, &event, dp->addr.client, dp->addr.port);166 167 if (snd_seq_oss_process_event(dp, rec, &event))168 return 0; /* invalid event - no need to insert queue */169 170 event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);171 if (dp->timer->realtime || !dp->timer->running)172 snd_seq_oss_dispatch(dp, &event, 0, 0);173 else174 rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt,175 !is_nonblock_mode(dp->file_mode));176 return rc;177}178 179 180/*181 * select / poll182 */183 184__poll_t185snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait)186{187 __poll_t mask = 0;188 189 /* input */190 if (dp->readq && is_read_mode(dp->file_mode)) {191 if (snd_seq_oss_readq_poll(dp->readq, file, wait))192 mask |= EPOLLIN | EPOLLRDNORM;193 }194 195 /* output */196 if (dp->writeq && is_write_mode(dp->file_mode)) {197 if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait))198 mask |= EPOLLOUT | EPOLLWRNORM;199 }200 return mask;201}202