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 dev_err(card->dev, "can't create client\n"); 65 return -ENODEV; 66 } 67 68 if (emu->num_ports <= 0) { 69 dev_warn(card->dev, "seqports must be greater than zero\n"); 70 emu->num_ports = 1; 71 } else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) { 72 dev_warn(card->dev, 73 "too many ports. limited max. ports %d\n", 74 SNDRV_EMUX_MAX_PORTS); 75 emu->num_ports = SNDRV_EMUX_MAX_PORTS; 76 } 77 78 memset(&pinfo, 0, sizeof(pinfo)); 79 pinfo.owner = THIS_MODULE; 80 pinfo.use = snd_emux_use; 81 pinfo.unuse = snd_emux_unuse; 82 pinfo.event_input = snd_emux_event_input; 83 84 for (i = 0; i < emu->num_ports; i++) { 85 struct snd_emux_port *p; 86 87 sprintf(tmpname, "%s Port %d", emu->name, i); 88 p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS, 89 0, &pinfo); 90 if (!p) { 91 dev_err(card->dev, "can't create port\n"); 92 return -ENOMEM; 93 } 94 95 p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI; 96 snd_emux_init_port(p); 97 emu->ports[i] = p->chset.port; 98 emu->portptrs[i] = p; 99 } 100 101 return 0; 102 } 103 104 105 /* 106 * Detach from the ports that were set up for this synthesizer and 107 * destroy the kernel client. 108 */ 109 void 110 snd_emux_detach_seq(struct snd_emux *emu) 111 { 112 if (emu->voices) 113 snd_emux_terminate_all(emu); 114 115 if (emu->client >= 0) { 116 snd_seq_delete_kernel_client(emu->client); 117 emu->client = -1; 118 } 119 } 120 121 122 /* 123 * create a sequencer port and channel_set 124 */ 125 126 struct snd_emux_port * 127 snd_emux_create_port(struct snd_emux *emu, char *name, 128 int max_channels, int oss_port, 129 struct snd_seq_port_callback *callback) 130 { 131 struct snd_emux_port *p; 132 int i, type, cap; 133 134 /* Allocate structures for this channel */ 135 p = kzalloc_flex(*p, chset.channels, max_channels); 136 if (!p) 137 return NULL; 138 139 p->chset.max_channels = max_channels; 140 141 for (i = 0; i < max_channels; i++) 142 p->chset.channels[i].number = i; 143 p->chset.private_data = p; 144 p->emu = emu; 145 p->chset.client = emu->client; 146 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 147 snd_emux_create_effect(p); 148 #endif 149 callback->private_free = free_port; 150 callback->private_data = p; 151 152 cap = SNDRV_SEQ_PORT_CAP_WRITE; 153 if (oss_port) { 154 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC; 155 } else { 156 type = DEFAULT_MIDI_TYPE; 157 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE; 158 } 159 160 p->chset.port = snd_seq_event_port_attach(emu->client, callback, 161 cap, type, max_channels, 162 emu->max_voices, name); 163 164 return p; 165 } 166 167 168 /* 169 * release memory block for port 170 */ 171 static void 172 free_port(void *private_data) 173 { 174 struct snd_emux_port *p; 175 176 p = private_data; 177 if (p) { 178 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 179 snd_emux_delete_effect(p); 180 #endif 181 kfree(p); 182 } 183 } 184 185 186 #define DEFAULT_DRUM_FLAGS (1<<9) 187 188 /* 189 * initialize the port specific parameters 190 */ 191 static void 192 snd_emux_init_port(struct snd_emux_port *p) 193 { 194 p->drum_flags = DEFAULT_DRUM_FLAGS; 195 p->volume_atten = 0; 196 197 snd_emux_reset_port(p); 198 } 199 200 201 /* 202 * reset port 203 */ 204 void 205 snd_emux_reset_port(struct snd_emux_port *port) 206 { 207 int i; 208 209 /* stop all sounds */ 210 snd_emux_sounds_off_all(port); 211 212 snd_midi_channel_set_clear(&port->chset); 213 214 #ifdef SNDRV_EMUX_USE_RAW_EFFECT 215 snd_emux_clear_effect(port); 216 #endif 217 218 /* set port specific control parameters */ 219 port->ctrls[EMUX_MD_DEF_BANK] = 0; 220 port->ctrls[EMUX_MD_DEF_DRUM] = 0; 221 port->ctrls[EMUX_MD_REALTIME_PAN] = 1; 222 223 for (i = 0; i < port->chset.max_channels; i++) { 224 struct snd_midi_channel *chan = port->chset.channels + i; 225 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0; 226 } 227 } 228 229 230 /* 231 * input sequencer event 232 */ 233 int 234 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data, 235 int atomic, int hop) 236 { 237 struct snd_emux_port *port; 238 239 port = private_data; 240 if (snd_BUG_ON(!port || !ev)) 241 return -EINVAL; 242 243 snd_midi_process_event(&emux_ops, ev, &port->chset); 244 245 return 0; 246 } 247 248 249 /* 250 * increment usage count 251 */ 252 static int 253 __snd_emux_inc_count(struct snd_emux *emu) 254 { 255 emu->used++; 256 if (!try_module_get(emu->ops.owner)) 257 goto __error; 258 if (!try_module_get(emu->card->module)) { 259 module_put(emu->ops.owner); 260 __error: 261 emu->used--; 262 return 0; 263 } 264 return 1; 265 } 266 267 int snd_emux_inc_count(struct snd_emux *emu) 268 { 269 guard(mutex)(&emu->register_mutex); 270 return __snd_emux_inc_count(emu); 271 } 272 273 /* 274 * decrease usage count 275 */ 276 static void 277 __snd_emux_dec_count(struct snd_emux *emu) 278 { 279 module_put(emu->card->module); 280 emu->used--; 281 if (emu->used <= 0) 282 snd_emux_terminate_all(emu); 283 module_put(emu->ops.owner); 284 } 285 286 void snd_emux_dec_count(struct snd_emux *emu) 287 { 288 guard(mutex)(&emu->register_mutex); 289 __snd_emux_dec_count(emu); 290 } 291 292 /* 293 * Routine that is called upon a first use of a particular port 294 */ 295 static int 296 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info) 297 { 298 struct snd_emux_port *p; 299 struct snd_emux *emu; 300 301 p = private_data; 302 if (snd_BUG_ON(!p)) 303 return -EINVAL; 304 emu = p->emu; 305 if (snd_BUG_ON(!emu)) 306 return -EINVAL; 307 308 guard(mutex)(&emu->register_mutex); 309 snd_emux_init_port(p); 310 __snd_emux_inc_count(emu); 311 return 0; 312 } 313 314 /* 315 * Routine that is called upon the last unuse() of a particular port. 316 */ 317 static int 318 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info) 319 { 320 struct snd_emux_port *p; 321 struct snd_emux *emu; 322 323 p = private_data; 324 if (snd_BUG_ON(!p)) 325 return -EINVAL; 326 emu = p->emu; 327 if (snd_BUG_ON(!emu)) 328 return -EINVAL; 329 330 guard(mutex)(&emu->register_mutex); 331 snd_emux_sounds_off_all(p); 332 __snd_emux_dec_count(emu); 333 return 0; 334 } 335 336 337 /* 338 * attach virtual rawmidi devices 339 */ 340 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card) 341 { 342 int i; 343 344 emu->vmidi = NULL; 345 if (emu->midi_ports <= 0) 346 return 0; 347 348 emu->vmidi = kzalloc_objs(*emu->vmidi, emu->midi_ports); 349 if (!emu->vmidi) 350 return -ENOMEM; 351 352 for (i = 0; i < emu->midi_ports; i++) { 353 struct snd_rawmidi *rmidi; 354 struct snd_virmidi_dev *rdev; 355 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0) 356 goto __error; 357 rdev = rmidi->private_data; 358 sprintf(rmidi->name, "%s Synth MIDI", emu->name); 359 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH; 360 rdev->client = emu->client; 361 rdev->port = emu->ports[i]; 362 if (snd_device_register(card, rmidi) < 0) { 363 snd_device_free(card, rmidi); 364 goto __error; 365 } 366 emu->vmidi[i] = rmidi; 367 } 368 return 0; 369 370 __error: 371 snd_emux_delete_virmidi(emu); 372 return -ENOMEM; 373 } 374 375 int snd_emux_delete_virmidi(struct snd_emux *emu) 376 { 377 int i; 378 379 if (!emu->vmidi) 380 return 0; 381 382 for (i = 0; i < emu->midi_ports; i++) { 383 if (emu->vmidi[i]) 384 snd_device_free(emu->card, emu->vmidi[i]); 385 } 386 kfree(emu->vmidi); 387 emu->vmidi = NULL; 388 return 0; 389 } 390