sound/drivers/opl3/opl3_oss.c

   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
  11 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
  12 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
  13 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
  14 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
  15 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
  16
  17 /* operators */
  18
  19 static 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
  28 static 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
  40 static 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
  47 static 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 */
  90 void 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         strscpy(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 */
 120 void 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 */
 131 static 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 */
 155 static 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
 174 static 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 */
 218 static 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 */
 244 static 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 }