1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Midi Sequencer interface routines. 4 * 5 * Copyright (C) 1999 Steve Ratcliffe 6 * Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de> 7 */ 8 9 #include "emux_voice.h" 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 13 /* Prototypes for static functions */ 14 static void free_port(void *private); 15 static void snd_emux_init_port(struct snd_emux_port *p); 16 static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info); 17 static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info); 18 19 /* 20 * MIDI emulation operators 21 */ 22 static const struct snd_midi_op emux_ops = { 23 .note_on = snd_emux_note_on, 24 .note_off = snd_emux_note_off, 25 .key_press = snd_emux_key_press, 26 .note_terminate = snd_emux_terminate_note, 27 .control = snd_emux_control, 28 .nrpn = snd_emux_nrpn, 29 .sysex = snd_emux_sysex, 30 }; 31 32 33 /* 34 * number of MIDI channels 35 */ 36 #define MIDI_CHANNELS 16 37 38 /* 39 * type flags for MIDI sequencer port 40 */ 41 #define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\ 42 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\ 43 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\ 44 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\ 45 SNDRV_SEQ_PORT_TYPE_HARDWARE |\ 46 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER) 47 48 /* 49 * Initialise the EMUX Synth by creating a client and registering 50 * a series of ports. 51 * Each of the ports will contain the 16 midi channels. Applications 52 * can connect to these ports to play midi data. 53 */ 54 int 55 snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index) 56 { 57 int i; 58 struct snd_seq_port_callback pinfo; 59 char tmpname[64]; 60 61 emu->client = snd_seq_create_kernel_client(card, index, 62 "%s WaveTable", emu->name); 63 if (emu->client < 0) { 64 snd_printk(KERN_ERR "can't create client\n"); 65 return -ENODEV; 66 } 67 68 if (emu->num_ports <= 0) { 69 snd_printk(KERN_WARNING "seqports must be greater than zero\n"); 70 emu->num_ports = 1; 71 } else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) { 72 snd_printk(KERN_WARNING "too many ports. " 73 "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS); 74 emu->num_ports = SNDRV_EMUX_MAX_PORTS; 75 } 76 77 memset(&pinfo, 0, sizeof(pinfo)); 78 pinfo.owner = THIS_MODULE; 79 pinfo.use = snd_emux_use; 80 pinfo.unuse = snd_emux_unuse; 81 pinfo.event_input = snd_emux_event_input; 82 83 for (i = 0; i < emu->num_ports; i++) { 84 struct snd_emux_port *p; 85 86 sprintf(tmpname, "%s Port %d", emu->name, i); 87 p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS, 88 0, &pinfo); 89 if (!p) { 90 snd_printk(KERN_ERR "can't create port\n"); 91 return -ENOMEM; 92 } 93 94 p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI; 95 snd_emux_init_port(p); 96 emu->ports[i] = p->chset.port; 97 emu->portptrs[i] = p; 98 } 99 100 return 0; 101 } 102 103 104 /* 105 * Detach from the ports that were set up for this synthesizer and 106 * destroy the kernel client. 107 */ 108 void 109 snd_emux_detach_seq(struct snd_emux *emu) 110 { 111 if (emu->voices) 112 snd_emux_terminate_all(emu); 113 114 if (emu->client >= 0) { 115 snd_seq_delete_kernel_client(emu->client); 116 emu->client = -1; 117 } 118 } 119 120 121 /* 122 * create a sequencer port and channel_set 123 */ 124 125 struct snd_emux_port * 126 snd_emux_create_port(struct snd_emux *emu, char *name, 127 int max_channels, int oss_port, 128 struct snd_seq_port_callback *callback) 129 { 130 struct snd_emux_port *p; 131 int i, type, cap; 132 133 /* Allocate structures for this channel */ 134 p = kzalloc(sizeof(*p), GFP_KERNEL); 135 if (!p) 136 return NULL; 137 138 p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels), 139 GFP_KERNEL); 140 if (!p->chset.channels) { 141 kfree(p); 142 return NULL; 143 } 144 for (i = 0; i < max_channels; i++) 145 p->chset.channels[i].number = i; 146 p->chset.private_data = p; 147 p->chset.max_channels = max_channels; 148 p->emu = emu; 149 p->chset.client = emu->client; 150 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 151 snd_emux_create_effect(p); 152 #endif 153 callback->private_free = free_port; 154 callback->private_data = p; 155 156 cap = SNDRV_SEQ_PORT_CAP_WRITE; 157 if (oss_port) { 158 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC; 159 } else { 160 type = DEFAULT_MIDI_TYPE; 161 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE; 162 } 163 164 p->chset.port = snd_seq_event_port_attach(emu->client, callback, 165 cap, type, max_channels, 166 emu->max_voices, name); 167 168 return p; 169 } 170 171 172 /* 173 * release memory block for port 174 */ 175 static void 176 free_port(void *private_data) 177 { 178 struct snd_emux_port *p; 179 180 p = private_data; 181 if (p) { 182 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 183 snd_emux_delete_effect(p); 184 #endif 185 kfree(p->chset.channels); 186 kfree(p); 187 } 188 } 189 190 191 #define DEFAULT_DRUM_FLAGS (1<<9) 192 193 /* 194 * initialize the port specific parameters 195 */ 196 static void 197 snd_emux_init_port(struct snd_emux_port *p) 198 { 199 p->drum_flags = DEFAULT_DRUM_FLAGS; 200 p->volume_atten = 0; 201 202 snd_emux_reset_port(p); 203 } 204 205 206 /* 207 * reset port 208 */ 209 void 210 snd_emux_reset_port(struct snd_emux_port *port) 211 { 212 int i; 213 214 /* stop all sounds */ 215 snd_emux_sounds_off_all(port); 216 217 snd_midi_channel_set_clear(&port->chset); 218 219 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 220 snd_emux_clear_effect(port); 221 #endif 222 223 /* set port specific control parameters */ 224 port->ctrls[EMUX_MD_DEF_BANK] = 0; 225 port->ctrls[EMUX_MD_DEF_DRUM] = 0; 226 port->ctrls[EMUX_MD_REALTIME_PAN] = 1; 227 228 for (i = 0; i < port->chset.max_channels; i++) { 229 struct snd_midi_channel *chan = port->chset.channels + i; 230 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0; 231 } 232 } 233 234 235 /* 236 * input sequencer event 237 */ 238 int 239 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data, 240 int atomic, int hop) 241 { 242 struct snd_emux_port *port; 243 244 port = private_data; 245 if (snd_BUG_ON(!port || !ev)) 246 return -EINVAL; 247 248 snd_midi_process_event(&emux_ops, ev, &port->chset); 249 250 return 0; 251 } 252 253 254 /* 255 * increment usage count 256 */ 257 static int 258 __snd_emux_inc_count(struct snd_emux *emu) 259 { 260 emu->used++; 261 if (!try_module_get(emu->ops.owner)) 262 goto __error; 263 if (!try_module_get(emu->card->module)) { 264 module_put(emu->ops.owner); 265 __error: 266 emu->used--; 267 return 0; 268 } 269 return 1; 270 } 271 272 int snd_emux_inc_count(struct snd_emux *emu) 273 { 274 int ret; 275 276 mutex_lock(&emu->register_mutex); 277 ret = __snd_emux_inc_count(emu); 278 mutex_unlock(&emu->register_mutex); 279 return ret; 280 } 281 282 /* 283 * decrease usage count 284 */ 285 static void 286 __snd_emux_dec_count(struct snd_emux *emu) 287 { 288 module_put(emu->card->module); 289 emu->used--; 290 if (emu->used <= 0) 291 snd_emux_terminate_all(emu); 292 module_put(emu->ops.owner); 293 } 294 295 void snd_emux_dec_count(struct snd_emux *emu) 296 { 297 mutex_lock(&emu->register_mutex); 298 __snd_emux_dec_count(emu); 299 mutex_unlock(&emu->register_mutex); 300 } 301 302 /* 303 * Routine that is called upon a first use of a particular port 304 */ 305 static int 306 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info) 307 { 308 struct snd_emux_port *p; 309 struct snd_emux *emu; 310 311 p = private_data; 312 if (snd_BUG_ON(!p)) 313 return -EINVAL; 314 emu = p->emu; 315 if (snd_BUG_ON(!emu)) 316 return -EINVAL; 317 318 mutex_lock(&emu->register_mutex); 319 snd_emux_init_port(p); 320 __snd_emux_inc_count(emu); 321 mutex_unlock(&emu->register_mutex); 322 return 0; 323 } 324 325 /* 326 * Routine that is called upon the last unuse() of a particular port. 327 */ 328 static int 329 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info) 330 { 331 struct snd_emux_port *p; 332 struct snd_emux *emu; 333 334 p = private_data; 335 if (snd_BUG_ON(!p)) 336 return -EINVAL; 337 emu = p->emu; 338 if (snd_BUG_ON(!emu)) 339 return -EINVAL; 340 341 mutex_lock(&emu->register_mutex); 342 snd_emux_sounds_off_all(p); 343 __snd_emux_dec_count(emu); 344 mutex_unlock(&emu->register_mutex); 345 return 0; 346 } 347 348 349 /* 350 * attach virtual rawmidi devices 351 */ 352 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card) 353 { 354 int i; 355 356 emu->vmidi = NULL; 357 if (emu->midi_ports <= 0) 358 return 0; 359 360 emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL); 361 if (!emu->vmidi) 362 return -ENOMEM; 363 364 for (i = 0; i < emu->midi_ports; i++) { 365 struct snd_rawmidi *rmidi; 366 struct snd_virmidi_dev *rdev; 367 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0) 368 goto __error; 369 rdev = rmidi->private_data; 370 sprintf(rmidi->name, "%s Synth MIDI", emu->name); 371 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH; 372 rdev->client = emu->client; 373 rdev->port = emu->ports[i]; 374 if (snd_device_register(card, rmidi) < 0) { 375 snd_device_free(card, rmidi); 376 goto __error; 377 } 378 emu->vmidi[i] = rmidi; 379 /* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */ 380 } 381 return 0; 382 383 __error: 384 /* snd_printk(KERN_DEBUG "error init..\n"); */ 385 snd_emux_delete_virmidi(emu); 386 return -ENOMEM; 387 } 388 389 int snd_emux_delete_virmidi(struct snd_emux *emu) 390 { 391 int i; 392 393 if (!emu->vmidi) 394 return 0; 395 396 for (i = 0; i < emu->midi_ports; i++) { 397 if (emu->vmidi[i]) 398 snd_device_free(emu->card, emu->vmidi[i]); 399 } 400 kfree(emu->vmidi); 401 emu->vmidi = NULL; 402 return 0; 403 } 404