linux/sound/drivers/opl3/opl3_oss.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Interface for OSS sequencer emulation
   4 *
   5 *  Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
   6 */
   7
   8#include <linux/export.h>
   9#include "opl3_voice.h"
  10
  11static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
  12static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
  13static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
  14static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
  15static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
  16
  17/* operators */
  18
  19static const struct snd_seq_oss_callback oss_callback = {
  20        .owner =        THIS_MODULE,
  21        .open =         snd_opl3_open_seq_oss,
  22        .close =        snd_opl3_close_seq_oss,
  23        .ioctl =        snd_opl3_ioctl_seq_oss,
  24        .load_patch =   snd_opl3_load_patch_seq_oss,
  25        .reset =        snd_opl3_reset_seq_oss,
  26};
  27
  28static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
  29                                    void *private_data, int atomic, int hop)
  30{
  31        struct snd_opl3 *opl3 = private_data;
  32
  33        if (ev->type != SNDRV_SEQ_EVENT_OSS)
  34                snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
  35        return 0;
  36}
  37
  38/* ------------------------------ */
  39
  40static void snd_opl3_oss_free_port(void *private_data)
  41{
  42        struct snd_opl3 *opl3 = private_data;
  43
  44        snd_midi_channel_free_set(opl3->oss_chset);
  45}
  46
  47static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
  48{
  49        struct snd_seq_port_callback callbacks;
  50        char name[32];
  51        int voices, opl_ver;
  52
  53        voices = (opl3->hardware < OPL3_HW_OPL3) ?
  54                MAX_OPL2_VOICES : MAX_OPL3_VOICES;
  55        opl3->oss_chset = snd_midi_channel_alloc_set(voices);
  56        if (opl3->oss_chset == NULL)
  57                return -ENOMEM;
  58        opl3->oss_chset->private_data = opl3;
  59
  60        memset(&callbacks, 0, sizeof(callbacks));
  61        callbacks.owner = THIS_MODULE;
  62        callbacks.event_input = snd_opl3_oss_event_input;
  63        callbacks.private_free = snd_opl3_oss_free_port;
  64        callbacks.private_data = opl3;
  65
  66        opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
  67        sprintf(name, "OPL%i OSS Port", opl_ver);
  68
  69        opl3->oss_chset->client = opl3->seq_client;
  70        opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
  71                                                          SNDRV_SEQ_PORT_CAP_WRITE,
  72                                                          SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
  73                                                          SNDRV_SEQ_PORT_TYPE_MIDI_GM |
  74                                                          SNDRV_SEQ_PORT_TYPE_HARDWARE |
  75                                                          SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
  76                                                          voices, voices,
  77                                                          name);
  78        if (opl3->oss_chset->port < 0) {
  79                int port;
  80                port = opl3->oss_chset->port;
  81                snd_midi_channel_free_set(opl3->oss_chset);
  82                return port;
  83        }
  84        return 0;
  85}
  86
  87/* ------------------------------ */
  88
  89/* register OSS synth */
  90void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
  91{
  92        struct snd_seq_oss_reg *arg;
  93        struct snd_seq_device *dev;
  94
  95        if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
  96                               sizeof(struct snd_seq_oss_reg), &dev) < 0)
  97                return;
  98
  99        opl3->oss_seq_dev = dev;
 100        strlcpy(dev->name, name, sizeof(dev->name));
 101        arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
 102        arg->type = SYNTH_TYPE_FM;
 103        if (opl3->hardware < OPL3_HW_OPL3) {
 104                arg->subtype = FM_TYPE_ADLIB;
 105                arg->nvoices = MAX_OPL2_VOICES;
 106        } else {
 107                arg->subtype = FM_TYPE_OPL3;
 108                arg->nvoices = MAX_OPL3_VOICES;
 109        }
 110        arg->oper = oss_callback;
 111        arg->private_data = opl3;
 112
 113        if (snd_opl3_oss_create_port(opl3)) {
 114                /* register to OSS synth table */
 115                snd_device_register(opl3->card, dev);
 116        }
 117}
 118
 119/* unregister */
 120void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
 121{
 122        if (opl3->oss_seq_dev) {
 123                /* The instance should have been released in prior */
 124                opl3->oss_seq_dev = NULL;
 125        }
 126}
 127
 128/* ------------------------------ */
 129
 130/* open OSS sequencer */
 131static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
 132{
 133        struct snd_opl3 *opl3 = closure;
 134        int err;
 135
 136        if (snd_BUG_ON(!arg))
 137                return -ENXIO;
 138
 139        if ((err = snd_opl3_synth_setup(opl3)) < 0)
 140                return err;
 141
 142        /* fill the argument data */
 143        arg->private_data = opl3;
 144        arg->addr.client = opl3->oss_chset->client;
 145        arg->addr.port = opl3->oss_chset->port;
 146
 147        if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
 148                return err;
 149
 150        opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
 151        return 0;
 152}
 153
 154/* close OSS sequencer */
 155static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
 156{
 157        struct snd_opl3 *opl3;
 158
 159        if (snd_BUG_ON(!arg))
 160                return -ENXIO;
 161        opl3 = arg->private_data;
 162
 163        snd_opl3_synth_cleanup(opl3);
 164
 165        snd_opl3_synth_use_dec(opl3);
 166        return 0;
 167}
 168
 169/* load patch */
 170
 171/* from sound_config.h */
 172#define SBFM_MAXINSTR   256
 173
 174static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
 175                                       const char __user *buf, int offs, int count)
 176{
 177        struct snd_opl3 *opl3;
 178        struct sbi_instrument sbi;
 179        char name[32];
 180        int err, type;
 181
 182        if (snd_BUG_ON(!arg))
 183                return -ENXIO;
 184        opl3 = arg->private_data;
 185
 186        if (format == FM_PATCH)
 187                type = FM_PATCH_OPL2;
 188        else if (format == OPL3_PATCH)
 189                type = FM_PATCH_OPL3;
 190        else
 191                return -EINVAL;
 192
 193        if (count < (int)sizeof(sbi)) {
 194                snd_printk(KERN_ERR "FM Error: Patch record too short\n");
 195                return -EINVAL;
 196        }
 197        if (copy_from_user(&sbi, buf, sizeof(sbi)))
 198                return -EFAULT;
 199
 200        if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
 201                snd_printk(KERN_ERR "FM Error: Invalid instrument number %d\n",
 202                           sbi.channel);
 203                return -EINVAL;
 204        }
 205
 206        memset(name, 0, sizeof(name));
 207        sprintf(name, "Chan%d", sbi.channel);
 208
 209        err = snd_opl3_load_patch(opl3, sbi.channel, 127, type, name, NULL,
 210                                  sbi.operators);
 211        if (err < 0)
 212                return err;
 213
 214        return sizeof(sbi);
 215}
 216
 217/* ioctl */
 218static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
 219                                  unsigned long ioarg)
 220{
 221        if (snd_BUG_ON(!arg))
 222                return -ENXIO;
 223        switch (cmd) {
 224                case SNDCTL_FM_LOAD_INSTR:
 225                        snd_printk(KERN_ERR "OPL3: "
 226                                   "Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. "
 227                                   "Fix the program.\n");
 228                        return -EINVAL;
 229
 230                case SNDCTL_SYNTH_MEMAVL:
 231                        return 0x7fffffff;
 232
 233                case SNDCTL_FM_4OP_ENABLE:
 234                        // handled automatically by OPL instrument type
 235                        return 0;
 236
 237                default:
 238                        return -EINVAL;
 239        }
 240        return 0;
 241}
 242
 243/* reset device */
 244static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
 245{
 246        if (snd_BUG_ON(!arg))
 247                return -ENXIO;
 248
 249        return 0;
 250}
 251