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Linux/sound/core/seq/oss/seq_oss_rw.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  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>
  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  */
 23 static int insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt);
 24 
 25 
 26 /*
 27  * read interface
 28  */
 29 
 30 int
 31 snd_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                         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
 83 snd_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                 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
151 insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)
152 {
153         int rc = 0;
154         struct snd_seq_event event;
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.client, dp->addr.port);
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);
170         if (dp->timer->realtime || !dp->timer->running)
171                 snd_seq_oss_dispatch(dp, &event, 0, 0);
172         else
173                 rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt,
174                                                    !is_nonblock_mode(dp->file_mode));
175         return rc;
176 }
177                 
178 
179 /*
180  * select / poll
181  */
182   
183 __poll_t
184 snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait)
185 {
186         __poll_t mask = 0;
187 
188         /* input */
189         if (dp->readq && is_read_mode(dp->file_mode)) {
190                 if (snd_seq_oss_readq_poll(dp->readq, file, wait))
191                         mask |= EPOLLIN | EPOLLRDNORM;
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))
197                         mask |= EPOLLOUT | EPOLLWRNORM;
198         }
199         return mask;
200 }
201 

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