sound/drivers/mpu401/mpu401_uart.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *  Routines for control of MPU-401 in UART mode
   4  *
   5  *  MPU-401 supports UART mode which is not capable generate transmit
   6  *  interrupts thus output is done via polling. Also, if irq < 0, then
   7  *  input is done also via polling. Do not expect good performance.
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  *   13-03-2003:
  25  *      Added support for different kind of hardware I/O. Build in choices
  26  *      are port and mmio. For other kind of I/O, set mpu->read and
  27  *      mpu->write to your own I/O functions.
  28  *
  29  */
  30
  31 #include <sound/driver.h>
  32 #include <asm/io.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/ioport.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/errno.h>
  39 #include <sound/core.h>
  40 #include <sound/mpu401.h>
  41
  42 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  43 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
  44 MODULE_LICENSE("GPL");
  45
  46 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
  47 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
  48
  49 /*
  50
  51  */
  52
  53 #define snd_mpu401_input_avail(mpu)     (!(mpu->read(mpu, MPU401C(mpu)) & 0x80))
  54 #define snd_mpu401_output_ready(mpu)    (!(mpu->read(mpu, MPU401C(mpu)) & 0x40))
  55
  56 #define MPU401_RESET            0xff
  57 #define MPU401_ENTER_UART       0x3f
  58 #define MPU401_ACK              0xfe
  59
  60 /* Build in lowlevel io */
  61 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
  62                               unsigned long addr)
  63 {
  64         outb(data, addr);
  65 }
  66
  67 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
  68                                       unsigned long addr)
  69 {
  70         return inb(addr);
  71 }
  72
  73 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
  74                               unsigned long addr)
  75 {
  76         writeb(data, (void __iomem *)addr);
  77 }
  78
  79 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
  80                                       unsigned long addr)
  81 {
  82         return readb((void __iomem *)addr);
  83 }
  84 /*  */
  85
  86 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
  87 {
  88         int timeout = 100000;
  89         for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
  90                 mpu->read(mpu, MPU401D(mpu));
  91 #ifdef CONFIG_SND_DEBUG
  92         if (timeout <= 0)
  93                 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
  94                            mpu->read(mpu, MPU401C(mpu)));
  95 #endif
  96 }
  97
  98 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
  99 {
 100         unsigned long flags;
 101
 102         if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
 103             test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
 104                 spin_lock_irqsave(&mpu->output_lock, flags);
 105                 snd_mpu401_uart_output_write(mpu);
 106                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 107         }
 108 }
 109
 110 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
 111 {
 112         unsigned long flags;
 113
 114         if (mpu->info_flags & MPU401_INFO_INPUT) {
 115                 spin_lock_irqsave(&mpu->input_lock, flags);
 116                 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 117                         snd_mpu401_uart_input_read(mpu);
 118                 else
 119                         snd_mpu401_uart_clear_rx(mpu);
 120                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 121         }
 122         if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 123                 /* ok. for better Tx performance try do some output
 124                    when input is done */
 125                 uart_interrupt_tx(mpu);
 126 }
 127
 128 /**
 129  * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
 130  * @irq: the irq number
 131  * @dev_id: mpu401 instance
 132  *
 133  * Processes the interrupt for MPU401-UART i/o.
 134  */
 135 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
 136 {
 137         struct snd_mpu401 *mpu = dev_id;
 138
 139         if (mpu == NULL)
 140                 return IRQ_NONE;
 141         _snd_mpu401_uart_interrupt(mpu);
 142         return IRQ_HANDLED;
 143 }
 144
 145 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
 146
 147 /**
 148  * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
 149  * @irq: the irq number
 150  * @dev_id: mpu401 instance
 151  *
 152  * Processes the interrupt for MPU401-UART output.
 153  */
 154 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
 155 {
 156         struct snd_mpu401 *mpu = dev_id;
 157
 158         if (mpu == NULL)
 159                 return IRQ_NONE;
 160         uart_interrupt_tx(mpu);
 161         return IRQ_HANDLED;
 162 }
 163
 164 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
 165
 166 /*
 167  * timer callback
 168  * reprogram the timer and call the interrupt job
 169  */
 170 static void snd_mpu401_uart_timer(unsigned long data)
 171 {
 172         struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
 173         unsigned long flags;
 174
 175         spin_lock_irqsave(&mpu->timer_lock, flags);
 176         /*mpu->mode |= MPU401_MODE_TIMER;*/
 177         mpu->timer.expires = 1 + jiffies;
 178         add_timer(&mpu->timer);
 179         spin_unlock_irqrestore(&mpu->timer_lock, flags);
 180         if (mpu->rmidi)
 181                 _snd_mpu401_uart_interrupt(mpu);
 182 }
 183
 184 /*
 185  * initialize the timer callback if not programmed yet
 186  */
 187 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
 188 {
 189         unsigned long flags;
 190
 191         spin_lock_irqsave (&mpu->timer_lock, flags);
 192         if (mpu->timer_invoked == 0) {
 193                 init_timer(&mpu->timer);
 194                 mpu->timer.data = (unsigned long)mpu;
 195                 mpu->timer.function = snd_mpu401_uart_timer;
 196                 mpu->timer.expires = 1 + jiffies;
 197                 add_timer(&mpu->timer);
 198         }
 199         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
 200                 MPU401_MODE_OUTPUT_TIMER;
 201         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 202 }
 203
 204 /*
 205  * remove the timer callback if still active
 206  */
 207 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
 208 {
 209         unsigned long flags;
 210
 211         spin_lock_irqsave (&mpu->timer_lock, flags);
 212         if (mpu->timer_invoked) {
 213                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
 214                         ~MPU401_MODE_OUTPUT_TIMER;
 215                 if (! mpu->timer_invoked)
 216                         del_timer(&mpu->timer);
 217         }
 218         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 219 }
 220
 221 /*
 222  * send a UART command
 223  * return zero if successful, non-zero for some errors
 224  */
 225
 226 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
 227                                int ack)
 228 {
 229         unsigned long flags;
 230         int timeout, ok;
 231
 232         spin_lock_irqsave(&mpu->input_lock, flags);
 233         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
 234                 mpu->write(mpu, 0x00, MPU401D(mpu));
 235                 /*snd_mpu401_uart_clear_rx(mpu);*/
 236         }
 237         /* ok. standard MPU-401 initialization */
 238         if (mpu->hardware != MPU401_HW_SB) {
 239                 for (timeout = 1000; timeout > 0 &&
 240                              !snd_mpu401_output_ready(mpu); timeout--)
 241                         udelay(10);
 242 #ifdef CONFIG_SND_DEBUG
 243                 if (!timeout)
 244                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
 245                                    mpu->read(mpu, MPU401C(mpu)));
 246 #endif
 247         }
 248         mpu->write(mpu, cmd, MPU401C(mpu));
 249         if (ack) {
 250                 ok = 0;
 251                 timeout = 10000;
 252                 while (!ok && timeout-- > 0) {
 253                         if (snd_mpu401_input_avail(mpu)) {
 254                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 255                                         ok = 1;
 256                         }
 257                 }
 258                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 259                         ok = 1;
 260         } else
 261                 ok = 1;
 262         spin_unlock_irqrestore(&mpu->input_lock, flags);
 263         if (!ok) {
 264                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
 265                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
 266                            mpu->read(mpu, MPU401C(mpu)),
 267                            mpu->read(mpu, MPU401D(mpu)));
 268                 return 1;
 269         }
 270         return 0;
 271 }
 272
 273 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
 274 {
 275         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
 276                 return -EIO;
 277         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
 278                 return -EIO;
 279         return 0;
 280 }
 281
 282 /*
 283  * input/output open/close - protected by open_mutex in rawmidi.c
 284  */
 285 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
 286 {
 287         struct snd_mpu401 *mpu;
 288         int err;
 289
 290         mpu = substream->rmidi->private_data;
 291         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
 292                 return err;
 293         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
 294                 if (snd_mpu401_do_reset(mpu) < 0)
 295                         goto error_out;
 296         }
 297         mpu->substream_input = substream;
 298         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 299         return 0;
 300
 301 error_out:
 302         if (mpu->open_input && mpu->close_input)
 303                 mpu->close_input(mpu);
 304         return -EIO;
 305 }
 306
 307 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
 308 {
 309         struct snd_mpu401 *mpu;
 310         int err;
 311
 312         mpu = substream->rmidi->private_data;
 313         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
 314                 return err;
 315         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
 316                 if (snd_mpu401_do_reset(mpu) < 0)
 317                         goto error_out;
 318         }
 319         mpu->substream_output = substream;
 320         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 321         return 0;
 322
 323 error_out:
 324         if (mpu->open_output && mpu->close_output)
 325                 mpu->close_output(mpu);
 326         return -EIO;
 327 }
 328
 329 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
 330 {
 331         struct snd_mpu401 *mpu;
 332         int err = 0;
 333
 334         mpu = substream->rmidi->private_data;
 335         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 336         mpu->substream_input = NULL;
 337         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
 338                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 339         if (mpu->close_input)
 340                 mpu->close_input(mpu);
 341         if (err)
 342                 return -EIO;
 343         return 0;
 344 }
 345
 346 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
 347 {
 348         struct snd_mpu401 *mpu;
 349         int err = 0;
 350
 351         mpu = substream->rmidi->private_data;
 352         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 353         mpu->substream_output = NULL;
 354         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 355                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 356         if (mpu->close_output)
 357                 mpu->close_output(mpu);
 358         if (err)
 359                 return -EIO;
 360         return 0;
 361 }
 362
 363 /*
 364  * trigger input callback
 365  */
 366 static void
 367 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 368 {
 369         unsigned long flags;
 370         struct snd_mpu401 *mpu;
 371         int max = 64;
 372
 373         mpu = substream->rmidi->private_data;
 374         if (up) {
 375                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
 376                                        &mpu->mode)) {
 377                         /* first time - flush FIFO */
 378                         while (max-- > 0)
 379                                 mpu->read(mpu, MPU401D(mpu));
 380                         if (mpu->irq < 0)
 381                                 snd_mpu401_uart_add_timer(mpu, 1);
 382                 }
 383
 384                 /* read data in advance */
 385                 spin_lock_irqsave(&mpu->input_lock, flags);
 386                 snd_mpu401_uart_input_read(mpu);
 387                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 388         } else {
 389                 if (mpu->irq < 0)
 390                         snd_mpu401_uart_remove_timer(mpu, 1);
 391                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
 392         }
 393
 394 }
 395
 396 /*
 397  * transfer input pending data
 398  * call with input_lock spinlock held
 399  */
 400 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
 401 {
 402         int max = 128;
 403         unsigned char byte;
 404
 405         while (max-- > 0) {
 406                 if (! snd_mpu401_input_avail(mpu))
 407                         break; /* input not available */
 408                 byte = mpu->read(mpu, MPU401D(mpu));
 409                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
 410                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
 411         }
 412 }
 413
 414 /*
 415  *  Tx FIFO sizes:
 416  *    CS4237B                   - 16 bytes
 417  *    AudioDrive ES1688         - 12 bytes
 418  *    S3 SonicVibes             -  8 bytes
 419  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
 420  */
 421
 422 /*
 423  * write output pending bytes
 424  * call with output_lock spinlock held
 425  */
 426 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
 427 {
 428         unsigned char byte;
 429         int max = 256, timeout;
 430
 431         do {
 432                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
 433                                               &byte, 1) == 1) {
 434                         for (timeout = 100; timeout > 0; timeout--) {
 435                                 if (snd_mpu401_output_ready(mpu))
 436                                         break;
 437                         }
 438                         if (timeout == 0)
 439                                 break;  /* Tx FIFO full - try again later */
 440                         mpu->write(mpu, byte, MPU401D(mpu));
 441                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
 442                 } else {
 443                         snd_mpu401_uart_remove_timer (mpu, 0);
 444                         break;  /* no other data - leave the tx loop */
 445                 }
 446         } while (--max > 0);
 447 }
 448
 449 /*
 450  * output trigger callback
 451  */
 452 static void
 453 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 454 {
 455         unsigned long flags;
 456         struct snd_mpu401 *mpu;
 457
 458         mpu = substream->rmidi->private_data;
 459         if (up) {
 460                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 461
 462                 /* try to add the timer at each output trigger,
 463                  * since the output timer might have been removed in
 464                  * snd_mpu401_uart_output_write().
 465                  */
 466                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 467                         snd_mpu401_uart_add_timer(mpu, 0);
 468
 469                 /* output pending data */
 470                 spin_lock_irqsave(&mpu->output_lock, flags);
 471                 snd_mpu401_uart_output_write(mpu);
 472                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 473         } else {
 474                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 475                         snd_mpu401_uart_remove_timer(mpu, 0);
 476                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 477         }
 478 }
 479
 480 /*
 481
 482  */
 483
 484 static struct snd_rawmidi_ops snd_mpu401_uart_output =
 485 {
 486         .open =         snd_mpu401_uart_output_open,
 487         .close =        snd_mpu401_uart_output_close,
 488         .trigger =      snd_mpu401_uart_output_trigger,
 489 };
 490
 491 static struct snd_rawmidi_ops snd_mpu401_uart_input =
 492 {
 493         .open =         snd_mpu401_uart_input_open,
 494         .close =        snd_mpu401_uart_input_close,
 495         .trigger =      snd_mpu401_uart_input_trigger,
 496 };
 497
 498 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
 499 {
 500         struct snd_mpu401 *mpu = rmidi->private_data;
 501         if (mpu->irq_flags && mpu->irq >= 0)
 502                 free_irq(mpu->irq, (void *) mpu);
 503         release_and_free_resource(mpu->res);
 504         kfree(mpu);
 505 }
 506
 507 /**
 508  * snd_mpu401_uart_new - create an MPU401-UART instance
 509  * @card: the card instance
 510  * @device: the device index, zero-based
 511  * @hardware: the hardware type, MPU401_HW_XXXX
 512  * @port: the base address of MPU401 port
 513  * @info_flags: bitflags MPU401_INFO_XXX
 514  * @irq: the irq number, -1 if no interrupt for mpu
 515  * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
 516  * @rrawmidi: the pointer to store the new rawmidi instance
 517  *
 518  * Creates a new MPU-401 instance.
 519  *
 520  * Note that the rawmidi instance is returned on the rrawmidi argument,
 521  * not the mpu401 instance itself.  To access to the mpu401 instance,
 522  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
 523  *
 524  * Returns zero if successful, or a negative error code.
 525  */
 526 int snd_mpu401_uart_new(struct snd_card *card, int device,
 527                         unsigned short hardware,
 528                         unsigned long port,
 529                         unsigned int info_flags,
 530                         int irq, int irq_flags,
 531                         struct snd_rawmidi ** rrawmidi)
 532 {
 533         struct snd_mpu401 *mpu;
 534         struct snd_rawmidi *rmidi;
 535         int in_enable, out_enable;
 536         int err;
 537
 538         if (rrawmidi)
 539                 *rrawmidi = NULL;
 540         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
 541                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
 542         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
 543         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
 544         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
 545                                    out_enable, in_enable, &rmidi)) < 0)
 546                 return err;
 547         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
 548         if (mpu == NULL) {
 549                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
 550                 snd_device_free(card, rmidi);
 551                 return -ENOMEM;
 552         }
 553         rmidi->private_data = mpu;
 554         rmidi->private_free = snd_mpu401_uart_free;
 555         spin_lock_init(&mpu->input_lock);
 556         spin_lock_init(&mpu->output_lock);
 557         spin_lock_init(&mpu->timer_lock);
 558         mpu->hardware = hardware;
 559         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
 560                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
 561                 mpu->res = request_region(port, res_size, "MPU401 UART");
 562                 if (mpu->res == NULL) {
 563                         snd_printk(KERN_ERR "mpu401_uart: "
 564                                    "unable to grab port 0x%lx size %d\n",
 565                                    port, res_size);
 566                         snd_device_free(card, rmidi);
 567                         return -EBUSY;
 568                 }
 569         }
 570         if (info_flags & MPU401_INFO_MMIO) {
 571                 mpu->write = mpu401_write_mmio;
 572                 mpu->read = mpu401_read_mmio;
 573         } else {
 574                 mpu->write = mpu401_write_port;
 575                 mpu->read = mpu401_read_port;
 576         }
 577         mpu->port = port;
 578         if (hardware == MPU401_HW_PC98II)
 579                 mpu->cport = port + 2;
 580         else
 581                 mpu->cport = port + 1;
 582         if (irq >= 0 && irq_flags) {
 583                 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
 584                                 "MPU401 UART", (void *) mpu)) {
 585                         snd_printk(KERN_ERR "mpu401_uart: "
 586                                    "unable to grab IRQ %d\n", irq);
 587                         snd_device_free(card, rmidi);
 588                         return -EBUSY;
 589                 }
 590         }
 591         mpu->info_flags = info_flags;
 592         mpu->irq = irq;
 593         mpu->irq_flags = irq_flags;
 594         if (card->shortname[0])
 595                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
 596                          card->shortname);
 597         else
 598                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
 599         if (out_enable) {
 600                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 601                                     &snd_mpu401_uart_output);
 602                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 603         }
 604         if (in_enable) {
 605                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 606                                     &snd_mpu401_uart_input);
 607                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 608                 if (out_enable)
 609                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 610         }
 611         mpu->rmidi = rmidi;
 612         if (rrawmidi)
 613                 *rrawmidi = rmidi;
 614         return 0;
 615 }
 616
 617 EXPORT_SYMBOL(snd_mpu401_uart_new);
 618
 619 /*
 620  *  INIT part
 621  */
 622
 623 static int __init alsa_mpu401_uart_init(void)
 624 {
 625         return 0;
 626 }
 627
 628 static void __exit alsa_mpu401_uart_exit(void)
 629 {
 630 }
 631
 632 module_init(alsa_mpu401_uart_init)
 633 module_exit(alsa_mpu401_uart_exit)