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

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  1 /*
  2  * OSS compatible sequencer driver
  3  *
  4  * read/write/select interface to device file
  5  *
  6  * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  */
 22 
 23 #include "seq_oss_device.h"
 24 #include "seq_oss_readq.h"
 25 #include "seq_oss_writeq.h"
 26 #include "seq_oss_synth.h"
 27 #include <sound/seq_oss_legacy.h>
 28 #include "seq_oss_event.h"
 29 #include "seq_oss_timer.h"
 30 #include "../seq_clientmgr.h"
 31 
 32 
 33 /*
 34  * protoypes
 35  */
 36 static int insert_queue(seq_oss_devinfo_t *dp, evrec_t *rec, struct file *opt);
 37 
 38 
 39 /*
 40  * read interface
 41  */
 42 
 43 int
 44 snd_seq_oss_read(seq_oss_devinfo_t *dp, char __user *buf, int count)
 45 {
 46         seq_oss_readq_t *readq = dp->readq;
 47         int cnt, pos;
 48         evrec_t *q;
 49         unsigned long flags;
 50 
 51         if (readq == NULL || ! is_read_mode(dp->file_mode))
 52                 return -EIO;
 53 
 54         /* copy queued events to read buffer */
 55         cnt = count;
 56         pos = 0;
 57         q = snd_seq_oss_readq_pick(readq, !is_nonblock_mode(dp->file_mode), &flags);
 58         if (q == NULL)
 59                 return 0;
 60         do {
 61                 int ev_len;
 62                 /* tansfer the data */
 63                 ev_len = ev_length(q);
 64                 if (copy_to_user(buf + pos, q, ev_len)) {
 65                         snd_seq_oss_readq_unlock(readq, flags);
 66                         break;
 67                 }
 68                 snd_seq_oss_readq_free(readq, flags);
 69                 pos += ev_len;
 70                 cnt -= ev_len;
 71                 if (cnt < ev_len)
 72                         break;
 73         } while ((q = snd_seq_oss_readq_pick(readq, 0, &flags)) != NULL);
 74 
 75         return count - cnt;
 76 }
 77 
 78 
 79 /*
 80  * write interface
 81  */
 82 
 83 int
 84 snd_seq_oss_write(seq_oss_devinfo_t *dp, const char __user *buf, int count, struct file *opt)
 85 {
 86         int rc, c, p, ev_size;
 87         evrec_t rec;
 88 
 89         if (! is_write_mode(dp->file_mode) || dp->writeq == NULL)
 90                 return -EIO;
 91 
 92         c = count;
 93         p = 0;
 94         while (c >= SHORT_EVENT_SIZE) {
 95                 if (copy_from_user(rec.c, buf + p, SHORT_EVENT_SIZE))
 96                         break;
 97                 p += SHORT_EVENT_SIZE;
 98 
 99                 if (rec.s.code == SEQ_FULLSIZE) {
100                         /* load patch */
101                         int fmt = (*(unsigned short *)rec.c) & 0xffff;
102                         return snd_seq_oss_synth_load_patch(dp, rec.s.dev, fmt, buf, p, c);
103 
104                 }
105                 if (ev_is_long(&rec)) {
106                         /* extended code */
107                         if (rec.s.code == SEQ_EXTENDED &&
108                             dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
109                                 return -EINVAL;
110                         ev_size = LONG_EVENT_SIZE;
111                         if (c < ev_size)
112                                 break;
113                         /* copy the reset 4 bytes */
114                         if (copy_from_user(rec.c + SHORT_EVENT_SIZE, buf + p,
115                                            LONG_EVENT_SIZE - SHORT_EVENT_SIZE))
116                                 break;
117                         p += LONG_EVENT_SIZE - SHORT_EVENT_SIZE;
118 
119                 } else {
120                         /* old-type code */
121                         if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
122                                 return -EINVAL;
123                         ev_size = SHORT_EVENT_SIZE;
124                 }
125 
126                 /* insert queue */
127                 if ((rc = insert_queue(dp, &rec, opt)) < 0)
128                         break;
129 
130                 c -= ev_size;
131         }
132 
133         if (count == c && is_nonblock_mode(dp->file_mode))
134                 return -EAGAIN;
135         return count - c;
136 }
137 
138 
139 /*
140  * insert event record to write queue
141  * return: 0 = OK, non-zero = NG
142  */
143 static int
144 insert_queue(seq_oss_devinfo_t *dp, evrec_t *rec, struct file *opt)
145 {
146         int rc = 0;
147         snd_seq_event_t event;
148 
149         /* if this is a timing event, process the current time */
150         if (snd_seq_oss_process_timer_event(dp->timer, rec))
151                 return 0; /* no need to insert queue */
152 
153         /* parse this event */
154         memset(&event, 0, sizeof(event));
155         /* set dummy -- to be sure */
156         event.type = SNDRV_SEQ_EVENT_NOTEOFF;
157         snd_seq_oss_fill_addr(dp, &event, dp->addr.port, dp->addr.client);
158 
159         if (snd_seq_oss_process_event(dp, rec, &event))
160                 return 0; /* invalid event - no need to insert queue */
161 
162         event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
163         if (dp->timer->realtime || !dp->timer->running) {
164                 snd_seq_oss_dispatch(dp, &event, 0, 0);
165         } else {
166                 if (is_nonblock_mode(dp->file_mode))
167                         rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, 0, 0);
168                 else
169                         rc = snd_seq_kernel_client_enqueue_blocking(dp->cseq, &event, opt, 0, 0);
170         }
171         return rc;
172 }
173                 
174 
175 /*
176  * select / poll
177  */
178   
179 unsigned int
180 snd_seq_oss_poll(seq_oss_devinfo_t *dp, struct file *file, poll_table * wait)
181 {
182         unsigned int mask = 0;
183 
184         /* input */
185         if (dp->readq && is_read_mode(dp->file_mode)) {
186                 if (snd_seq_oss_readq_poll(dp->readq, file, wait))
187                         mask |= POLLIN | POLLRDNORM;
188         }
189 
190         /* output */
191         if (dp->writeq && is_write_mode(dp->file_mode)) {
192                 if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait))
193                         mask |= POLLOUT | POLLWRNORM;
194         }
195         return mask;
196 }
197 

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