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 <asm/io.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/slab.h>
  35 #include <linux/ioport.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/errno.h>
  38 #include <sound/core.h>
  39 #include <sound/mpu401.h>
  40
  41 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  42 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
  43 MODULE_LICENSE("GPL");
  44
  45 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
  46 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
  47
  48 /*
  49
  50  */
  51
  52 #define snd_mpu401_input_avail(mpu) \
  53         (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
  54 #define snd_mpu401_output_ready(mpu) \
  55         (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
  56
  57 /* Build in lowlevel io */
  58 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
  59                               unsigned long addr)
  60 {
  61         outb(data, addr);
  62 }
  63
  64 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
  65                                       unsigned long addr)
  66 {
  67         return inb(addr);
  68 }
  69
  70 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
  71                               unsigned long addr)
  72 {
  73         writeb(data, (void __iomem *)addr);
  74 }
  75
  76 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
  77                                       unsigned long addr)
  78 {
  79         return readb((void __iomem *)addr);
  80 }
  81 /*  */
  82
  83 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
  84 {
  85         int timeout = 100000;
  86         for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
  87                 mpu->read(mpu, MPU401D(mpu));
  88 #ifdef CONFIG_SND_DEBUG
  89         if (timeout <= 0)
  90                 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
  91                            mpu->read(mpu, MPU401C(mpu)));
  92 #endif
  93 }
  94
  95 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
  96 {
  97         unsigned long flags;
  98
  99         if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
 100             test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
 101                 spin_lock_irqsave(&mpu->output_lock, flags);
 102                 snd_mpu401_uart_output_write(mpu);
 103                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 104         }
 105 }
 106
 107 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
 108 {
 109         unsigned long flags;
 110
 111         if (mpu->info_flags & MPU401_INFO_INPUT) {
 112                 spin_lock_irqsave(&mpu->input_lock, flags);
 113                 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 114                         snd_mpu401_uart_input_read(mpu);
 115                 else
 116                         snd_mpu401_uart_clear_rx(mpu);
 117                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 118         }
 119         if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 120                 /* ok. for better Tx performance try do some output
 121                    when input is done */
 122                 uart_interrupt_tx(mpu);
 123 }
 124
 125 /**
 126  * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
 127  * @irq: the irq number
 128  * @dev_id: mpu401 instance
 129  *
 130  * Processes the interrupt for MPU401-UART i/o.
 131  */
 132 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
 133 {
 134         struct snd_mpu401 *mpu = dev_id;
 135
 136         if (mpu == NULL)
 137                 return IRQ_NONE;
 138         _snd_mpu401_uart_interrupt(mpu);
 139         return IRQ_HANDLED;
 140 }
 141
 142 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
 143
 144 /**
 145  * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
 146  * @irq: the irq number
 147  * @dev_id: mpu401 instance
 148  *
 149  * Processes the interrupt for MPU401-UART output.
 150  */
 151 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
 152 {
 153         struct snd_mpu401 *mpu = dev_id;
 154
 155         if (mpu == NULL)
 156                 return IRQ_NONE;
 157         uart_interrupt_tx(mpu);
 158         return IRQ_HANDLED;
 159 }
 160
 161 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
 162
 163 /*
 164  * timer callback
 165  * reprogram the timer and call the interrupt job
 166  */
 167 static void snd_mpu401_uart_timer(unsigned long data)
 168 {
 169         struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&mpu->timer_lock, flags);
 173         /*mpu->mode |= MPU401_MODE_TIMER;*/
 174         mpu->timer.expires = 1 + jiffies;
 175         add_timer(&mpu->timer);
 176         spin_unlock_irqrestore(&mpu->timer_lock, flags);
 177         if (mpu->rmidi)
 178                 _snd_mpu401_uart_interrupt(mpu);
 179 }
 180
 181 /*
 182  * initialize the timer callback if not programmed yet
 183  */
 184 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
 185 {
 186         unsigned long flags;
 187
 188         spin_lock_irqsave (&mpu->timer_lock, flags);
 189         if (mpu->timer_invoked == 0) {
 190                 init_timer(&mpu->timer);
 191                 mpu->timer.data = (unsigned long)mpu;
 192                 mpu->timer.function = snd_mpu401_uart_timer;
 193                 mpu->timer.expires = 1 + jiffies;
 194                 add_timer(&mpu->timer);
 195         }
 196         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
 197                 MPU401_MODE_OUTPUT_TIMER;
 198         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 199 }
 200
 201 /*
 202  * remove the timer callback if still active
 203  */
 204 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
 205 {
 206         unsigned long flags;
 207
 208         spin_lock_irqsave (&mpu->timer_lock, flags);
 209         if (mpu->timer_invoked) {
 210                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
 211                         ~MPU401_MODE_OUTPUT_TIMER;
 212                 if (! mpu->timer_invoked)
 213                         del_timer(&mpu->timer);
 214         }
 215         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 216 }
 217
 218 /*
 219  * send a UART command
 220  * return zero if successful, non-zero for some errors
 221  */
 222
 223 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
 224                                int ack)
 225 {
 226         unsigned long flags;
 227         int timeout, ok;
 228
 229         spin_lock_irqsave(&mpu->input_lock, flags);
 230         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
 231                 mpu->write(mpu, 0x00, MPU401D(mpu));
 232                 /*snd_mpu401_uart_clear_rx(mpu);*/
 233         }
 234         /* ok. standard MPU-401 initialization */
 235         if (mpu->hardware != MPU401_HW_SB) {
 236                 for (timeout = 1000; timeout > 0 &&
 237                              !snd_mpu401_output_ready(mpu); timeout--)
 238                         udelay(10);
 239 #ifdef CONFIG_SND_DEBUG
 240                 if (!timeout)
 241                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
 242                                    mpu->read(mpu, MPU401C(mpu)));
 243 #endif
 244         }
 245         mpu->write(mpu, cmd, MPU401C(mpu));
 246         if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
 247                 ok = 0;
 248                 timeout = 10000;
 249                 while (!ok && timeout-- > 0) {
 250                         if (snd_mpu401_input_avail(mpu)) {
 251                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 252                                         ok = 1;
 253                         }
 254                 }
 255                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 256                         ok = 1;
 257         } else
 258                 ok = 1;
 259         spin_unlock_irqrestore(&mpu->input_lock, flags);
 260         if (!ok) {
 261                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
 262                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
 263                            mpu->read(mpu, MPU401C(mpu)),
 264                            mpu->read(mpu, MPU401D(mpu)));
 265                 return 1;
 266         }
 267         return 0;
 268 }
 269
 270 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
 271 {
 272         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
 273                 return -EIO;
 274         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
 275                 return -EIO;
 276         return 0;
 277 }
 278
 279 /*
 280  * input/output open/close - protected by open_mutex in rawmidi.c
 281  */
 282 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
 283 {
 284         struct snd_mpu401 *mpu;
 285         int err;
 286
 287         mpu = substream->rmidi->private_data;
 288         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
 289                 return err;
 290         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
 291                 if (snd_mpu401_do_reset(mpu) < 0)
 292                         goto error_out;
 293         }
 294         mpu->substream_input = substream;
 295         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 296         return 0;
 297
 298 error_out:
 299         if (mpu->open_input && mpu->close_input)
 300                 mpu->close_input(mpu);
 301         return -EIO;
 302 }
 303
 304 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
 305 {
 306         struct snd_mpu401 *mpu;
 307         int err;
 308
 309         mpu = substream->rmidi->private_data;
 310         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
 311                 return err;
 312         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
 313                 if (snd_mpu401_do_reset(mpu) < 0)
 314                         goto error_out;
 315         }
 316         mpu->substream_output = substream;
 317         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 318         return 0;
 319
 320 error_out:
 321         if (mpu->open_output && mpu->close_output)
 322                 mpu->close_output(mpu);
 323         return -EIO;
 324 }
 325
 326 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
 327 {
 328         struct snd_mpu401 *mpu;
 329         int err = 0;
 330
 331         mpu = substream->rmidi->private_data;
 332         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 333         mpu->substream_input = NULL;
 334         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
 335                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 336         if (mpu->close_input)
 337                 mpu->close_input(mpu);
 338         if (err)
 339                 return -EIO;
 340         return 0;
 341 }
 342
 343 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
 344 {
 345         struct snd_mpu401 *mpu;
 346         int err = 0;
 347
 348         mpu = substream->rmidi->private_data;
 349         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 350         mpu->substream_output = NULL;
 351         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 352                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 353         if (mpu->close_output)
 354                 mpu->close_output(mpu);
 355         if (err)
 356                 return -EIO;
 357         return 0;
 358 }
 359
 360 /*
 361  * trigger input callback
 362  */
 363 static void
 364 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 365 {
 366         unsigned long flags;
 367         struct snd_mpu401 *mpu;
 368         int max = 64;
 369
 370         mpu = substream->rmidi->private_data;
 371         if (up) {
 372                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
 373                                        &mpu->mode)) {
 374                         /* first time - flush FIFO */
 375                         while (max-- > 0)
 376                                 mpu->read(mpu, MPU401D(mpu));
 377                         if (mpu->irq < 0)
 378                                 snd_mpu401_uart_add_timer(mpu, 1);
 379                 }
 380
 381                 /* read data in advance */
 382                 spin_lock_irqsave(&mpu->input_lock, flags);
 383                 snd_mpu401_uart_input_read(mpu);
 384                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 385         } else {
 386                 if (mpu->irq < 0)
 387                         snd_mpu401_uart_remove_timer(mpu, 1);
 388                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
 389         }
 390
 391 }
 392
 393 /*
 394  * transfer input pending data
 395  * call with input_lock spinlock held
 396  */
 397 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
 398 {
 399         int max = 128;
 400         unsigned char byte;
 401
 402         while (max-- > 0) {
 403                 if (! snd_mpu401_input_avail(mpu))
 404                         break; /* input not available */
 405                 byte = mpu->read(mpu, MPU401D(mpu));
 406                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
 407                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
 408         }
 409 }
 410
 411 /*
 412  *  Tx FIFO sizes:
 413  *    CS4237B                   - 16 bytes
 414  *    AudioDrive ES1688         - 12 bytes
 415  *    S3 SonicVibes             -  8 bytes
 416  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
 417  */
 418
 419 /*
 420  * write output pending bytes
 421  * call with output_lock spinlock held
 422  */
 423 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
 424 {
 425         unsigned char byte;
 426         int max = 256;
 427
 428         do {
 429                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
 430                                               &byte, 1) == 1) {
 431                         /*
 432                          * Try twice because there is hardware that insists on
 433                          * setting the output busy bit after each write.
 434                          */
 435                         if (!snd_mpu401_output_ready(mpu) &&
 436                             !snd_mpu401_output_ready(mpu))
 437                                 break;  /* Tx FIFO full - try again later */
 438                         mpu->write(mpu, byte, MPU401D(mpu));
 439                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
 440                 } else {
 441                         snd_mpu401_uart_remove_timer (mpu, 0);
 442                         break;  /* no other data - leave the tx loop */
 443                 }
 444         } while (--max > 0);
 445 }
 446
 447 /*
 448  * output trigger callback
 449  */
 450 static void
 451 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 452 {
 453         unsigned long flags;
 454         struct snd_mpu401 *mpu;
 455
 456         mpu = substream->rmidi->private_data;
 457         if (up) {
 458                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 459
 460                 /* try to add the timer at each output trigger,
 461                  * since the output timer might have been removed in
 462                  * snd_mpu401_uart_output_write().
 463                  */
 464                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 465                         snd_mpu401_uart_add_timer(mpu, 0);
 466
 467                 /* output pending data */
 468                 spin_lock_irqsave(&mpu->output_lock, flags);
 469                 snd_mpu401_uart_output_write(mpu);
 470                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 471         } else {
 472                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 473                         snd_mpu401_uart_remove_timer(mpu, 0);
 474                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 475         }
 476 }
 477
 478 /*
 479
 480  */
 481
 482 static struct snd_rawmidi_ops snd_mpu401_uart_output =
 483 {
 484         .open =         snd_mpu401_uart_output_open,
 485         .close =        snd_mpu401_uart_output_close,
 486         .trigger =      snd_mpu401_uart_output_trigger,
 487 };
 488
 489 static struct snd_rawmidi_ops snd_mpu401_uart_input =
 490 {
 491         .open =         snd_mpu401_uart_input_open,
 492         .close =        snd_mpu401_uart_input_close,
 493         .trigger =      snd_mpu401_uart_input_trigger,
 494 };
 495
 496 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
 497 {
 498         struct snd_mpu401 *mpu = rmidi->private_data;
 499         if (mpu->irq_flags && mpu->irq >= 0)
 500                 free_irq(mpu->irq, (void *) mpu);
 501         release_and_free_resource(mpu->res);
 502         kfree(mpu);
 503 }
 504
 505 /**
 506  * snd_mpu401_uart_new - create an MPU401-UART instance
 507  * @card: the card instance
 508  * @device: the device index, zero-based
 509  * @hardware: the hardware type, MPU401_HW_XXXX
 510  * @port: the base address of MPU401 port
 511  * @info_flags: bitflags MPU401_INFO_XXX
 512  * @irq: the irq number, -1 if no interrupt for mpu
 513  * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
 514  * @rrawmidi: the pointer to store the new rawmidi instance
 515  *
 516  * Creates a new MPU-401 instance.
 517  *
 518  * Note that the rawmidi instance is returned on the rrawmidi argument,
 519  * not the mpu401 instance itself.  To access to the mpu401 instance,
 520  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
 521  *
 522  * Returns zero if successful, or a negative error code.
 523  */
 524 int snd_mpu401_uart_new(struct snd_card *card, int device,
 525                         unsigned short hardware,
 526                         unsigned long port,
 527                         unsigned int info_flags,
 528                         int irq, int irq_flags,
 529                         struct snd_rawmidi ** rrawmidi)
 530 {
 531         struct snd_mpu401 *mpu;
 532         struct snd_rawmidi *rmidi;
 533         int in_enable, out_enable;
 534         int err;
 535
 536         if (rrawmidi)
 537                 *rrawmidi = NULL;
 538         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
 539                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
 540         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
 541         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
 542         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
 543                                    out_enable, in_enable, &rmidi)) < 0)
 544                 return err;
 545         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
 546         if (mpu == NULL) {
 547                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
 548                 snd_device_free(card, rmidi);
 549                 return -ENOMEM;
 550         }
 551         rmidi->private_data = mpu;
 552         rmidi->private_free = snd_mpu401_uart_free;
 553         spin_lock_init(&mpu->input_lock);
 554         spin_lock_init(&mpu->output_lock);
 555         spin_lock_init(&mpu->timer_lock);
 556         mpu->hardware = hardware;
 557         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
 558                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
 559                 mpu->res = request_region(port, res_size, "MPU401 UART");
 560                 if (mpu->res == NULL) {
 561                         snd_printk(KERN_ERR "mpu401_uart: "
 562                                    "unable to grab port 0x%lx size %d\n",
 563                                    port, res_size);
 564                         snd_device_free(card, rmidi);
 565                         return -EBUSY;
 566                 }
 567         }
 568         if (info_flags & MPU401_INFO_MMIO) {
 569                 mpu->write = mpu401_write_mmio;
 570                 mpu->read = mpu401_read_mmio;
 571         } else {
 572                 mpu->write = mpu401_write_port;
 573                 mpu->read = mpu401_read_port;
 574         }
 575         mpu->port = port;
 576         if (hardware == MPU401_HW_PC98II)
 577                 mpu->cport = port + 2;
 578         else
 579                 mpu->cport = port + 1;
 580         if (irq >= 0 && irq_flags) {
 581                 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
 582                                 "MPU401 UART", (void *) mpu)) {
 583                         snd_printk(KERN_ERR "mpu401_uart: "
 584                                    "unable to grab IRQ %d\n", irq);
 585                         snd_device_free(card, rmidi);
 586                         return -EBUSY;
 587                 }
 588         }
 589         mpu->info_flags = info_flags;
 590         mpu->irq = irq;
 591         mpu->irq_flags = irq_flags;
 592         if (card->shortname[0])
 593                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
 594                          card->shortname);
 595         else
 596                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
 597         if (out_enable) {
 598                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 599                                     &snd_mpu401_uart_output);
 600                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 601         }
 602         if (in_enable) {
 603                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 604                                     &snd_mpu401_uart_input);
 605                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 606                 if (out_enable)
 607                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 608         }
 609         mpu->rmidi = rmidi;
 610         if (rrawmidi)
 611                 *rrawmidi = rmidi;
 612         return 0;
 613 }
 614
 615 EXPORT_SYMBOL(snd_mpu401_uart_new);
 616
 617 /*
 618  *  INIT part
 619  */
 620
 621 static int __init alsa_mpu401_uart_init(void)
 622 {
 623         return 0;
 624 }
 625
 626 static void __exit alsa_mpu401_uart_exit(void)
 627 {
 628 }
 629
 630 module_init(alsa_mpu401_uart_init)
 631 module_exit(alsa_mpu401_uart_exit)