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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | // SPDX-License-Identifier: GPL-2.0-or-later /* * OSS compatible sequencer driver * * read/write/select interface to device file * * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> */ #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(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt); /* * read interface */ int snd_seq_oss_read(struct seq_oss_devinfo *dp, char __user *buf, int count) { struct seq_oss_readq *readq = dp->readq; int result = 0, err = 0; int ev_len; union evrec rec; unsigned long flags; if (readq == NULL || ! is_read_mode(dp->file_mode)) return -ENXIO; while (count >= SHORT_EVENT_SIZE) { snd_seq_oss_readq_lock(readq, flags); err = snd_seq_oss_readq_pick(readq, &rec); if (err == -EAGAIN && !is_nonblock_mode(dp->file_mode) && result == 0) { snd_seq_oss_readq_unlock(readq, flags); snd_seq_oss_readq_wait(readq); snd_seq_oss_readq_lock(readq, flags); if (signal_pending(current)) err = -ERESTARTSYS; else err = snd_seq_oss_readq_pick(readq, &rec); } if (err < 0) { snd_seq_oss_readq_unlock(readq, flags); break; } ev_len = ev_length(&rec); if (ev_len < count) { snd_seq_oss_readq_unlock(readq, flags); break; } snd_seq_oss_readq_free(readq); snd_seq_oss_readq_unlock(readq, flags); if (copy_to_user(buf, &rec, ev_len)) { err = -EFAULT; break; } result += ev_len; buf += ev_len; count -= ev_len; } return result > 0 ? result : err; } /* * write interface */ int snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count, struct file *opt) { int result = 0, err = 0; int ev_size, fmt; union evrec rec; if (! is_write_mode(dp->file_mode) || dp->writeq == NULL) return -ENXIO; while (count >= SHORT_EVENT_SIZE) { if (copy_from_user(&rec, buf, SHORT_EVENT_SIZE)) { err = -EFAULT; break; } if (rec.s.code == SEQ_FULLSIZE) { /* load patch */ if (result > 0) { err = -EINVAL; break; } fmt = (*(unsigned short *)rec.c) & 0xffff; /* FIXME the return value isn't correct */ return snd_seq_oss_synth_load_patch(dp, rec.s.dev, fmt, buf, 0, count); } if (ev_is_long(&rec)) { /* extended code */ if (rec.s.code == SEQ_EXTENDED && dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) { err = -EINVAL; break; } ev_size = LONG_EVENT_SIZE; if (count < ev_size) break; /* copy the reset 4 bytes */ if (copy_from_user(rec.c + SHORT_EVENT_SIZE, buf + SHORT_EVENT_SIZE, LONG_EVENT_SIZE - SHORT_EVENT_SIZE)) { err = -EFAULT; break; } } else { /* old-type code */ if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) { err = -EINVAL; break; } ev_size = SHORT_EVENT_SIZE; } /* insert queue */ err = insert_queue(dp, &rec, opt); if (err < 0) break; result += ev_size; buf += ev_size; count -= ev_size; } return result > 0 ? result : err; } /* * insert event record to write queue * return: 0 = OK, non-zero = NG */ static int insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt) { int rc = 0; struct snd_seq_event 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.client, dp->addr.port); 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 rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, opt, !is_nonblock_mode(dp->file_mode)); return rc; } /* * select / poll */ __poll_t snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait) { __poll_t mask = 0; /* input */ if (dp->readq && is_read_mode(dp->file_mode)) { if (snd_seq_oss_readq_poll(dp->readq, file, wait)) mask |= EPOLLIN | EPOLLRDNORM; } /* output */ if (dp->writeq && is_write_mode(dp->file_mode)) { if (snd_seq_kernel_client_write_poll(dp->cseq, file, wait)) mask |= EPOLLOUT | EPOLLWRNORM; } return mask; } |