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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | /* * OSS compatible sequencer driver * * read/write/select interface to device file * * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #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(seq_oss_devinfo_t *dp, evrec_t *rec, struct file *opt); /* * read interface */ int snd_seq_oss_read(seq_oss_devinfo_t *dp, char *buf, int count) { seq_oss_readq_t *readq = dp->readq; int cnt, pos; evrec_t *q; unsigned long flags; if (readq == NULL || ! is_read_mode(dp->file_mode)) return -EIO; /* copy queued events to read buffer */ cnt = count; pos = 0; q = snd_seq_oss_readq_pick(readq, !is_nonblock_mode(dp->file_mode), &flags); if (q == NULL) return 0; do { int ev_len; /* tansfer the data */ ev_len = ev_length(q); if (copy_to_user(buf + pos, q, ev_len)) { snd_seq_oss_readq_unlock(readq, flags); break; } snd_seq_oss_readq_free(readq, flags); pos += ev_len; cnt -= ev_len; if (cnt < ev_len) break; } while ((q = snd_seq_oss_readq_pick(readq, 0, &flags)) != NULL); return count - cnt; } /* * write interface */ int snd_seq_oss_write(seq_oss_devinfo_t *dp, const char *buf, int count, struct file *opt) { int rc, c, p, ev_size; evrec_t rec; if (! is_write_mode(dp->file_mode) || dp->writeq == NULL) return -EIO; c = count; p = 0; while (c >= SHORT_EVENT_SIZE) { if (copy_from_user(rec.c, buf + p, SHORT_EVENT_SIZE)) break; p += SHORT_EVENT_SIZE; if (rec.s.code == SEQ_FULLSIZE) { /* load patch */ int fmt = (*(unsigned short *)rec.c) & 0xffff; return snd_seq_oss_synth_load_patch(dp, rec.s.dev, fmt, buf, p, c); } if (ev_is_long(&rec)) { /* extended code */ if (rec.s.code == SEQ_EXTENDED && dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) return -EINVAL; ev_size = LONG_EVENT_SIZE; if (c < ev_size) break; /* copy the reset 4 bytes */ if (copy_from_user(rec.c + SHORT_EVENT_SIZE, buf + p, LONG_EVENT_SIZE - SHORT_EVENT_SIZE)) break; p += LONG_EVENT_SIZE - SHORT_EVENT_SIZE; } else { /* old-type code */ if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) return -EINVAL; ev_size = SHORT_EVENT_SIZE; } /* insert queue */ if ((rc = insert_queue(dp, &rec, opt)) < 0) break; c -= ev_size; } if (count == c && is_nonblock_mode(dp->file_mode)) return -EAGAIN; return count - c; } /* * insert event record to write queue * return: 0 = OK, non-zero = NG */ static int insert_queue(seq_oss_devinfo_t *dp, evrec_t *rec, struct file *opt) { int rc = 0; snd_seq_event_t 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 { if (is_nonblock_mode(dp->file_mode)) rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, 0, 0); else rc = snd_seq_kernel_client_enqueue_blocking(dp->cseq, &event, opt, 0, 0); } return rc; } /* * select / poll */ unsigned int snd_seq_oss_poll(seq_oss_devinfo_t *dp, struct file *file, poll_table * wait) { unsigned int mask = 0; /* input */ if (dp->readq && is_read_mode(dp->file_mode)) { if (snd_seq_oss_readq_poll(dp->readq, file, wait)) mask |= POLLIN | POLLRDNORM; } /* output */ if (dp->writeq && is_write_mode(dp->file_mode)) { if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait)) mask |= POLLOUT | POLLWRNORM; } return mask; } |