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. Without interrupt,
   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/module.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) \
  54         (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
  55 #define snd_mpu401_output_ready(mpu) \
  56         (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
  57
  58 /* Build in lowlevel io */
  59 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
  60                               unsigned long addr)
  61 {
  62         outb(data, addr);
  63 }
  64
  65 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
  66                                       unsigned long addr)
  67 {
  68         return inb(addr);
  69 }
  70
  71 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
  72                               unsigned long addr)
  73 {
  74         writeb(data, (void __iomem *)addr);
  75 }
  76
  77 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
  78                                       unsigned long addr)
  79 {
  80         return readb((void __iomem *)addr);
  81 }
  82 /*  */
  83
  84 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
  85 {
  86         int timeout = 100000;
  87         for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
  88                 mpu->read(mpu, MPU401D(mpu));
  89 #ifdef CONFIG_SND_DEBUG
  90         if (timeout <= 0)
  91                 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
  92                            mpu->read(mpu, MPU401C(mpu)));
  93 #endif
  94 }
  95
  96 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
  97 {
  98         unsigned long flags;
  99
 100         if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
 101             test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
 102                 spin_lock_irqsave(&mpu->output_lock, flags);
 103                 snd_mpu401_uart_output_write(mpu);
 104                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 105         }
 106 }
 107
 108 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
 109 {
 110         unsigned long flags;
 111
 112         if (mpu->info_flags & MPU401_INFO_INPUT) {
 113                 spin_lock_irqsave(&mpu->input_lock, flags);
 114                 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 115                         snd_mpu401_uart_input_read(mpu);
 116                 else
 117                         snd_mpu401_uart_clear_rx(mpu);
 118                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 119         }
 120         if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 121                 /* ok. for better Tx performance try do some output
 122                    when input is done */
 123                 uart_interrupt_tx(mpu);
 124 }
 125
 126 /**
 127  * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
 128  * @irq: the irq number
 129  * @dev_id: mpu401 instance
 130  *
 131  * Processes the interrupt for MPU401-UART i/o.
 132  *
 133  * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
 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  * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
 155  */
 156 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
 157 {
 158         struct snd_mpu401 *mpu = dev_id;
 159
 160         if (mpu == NULL)
 161                 return IRQ_NONE;
 162         uart_interrupt_tx(mpu);
 163         return IRQ_HANDLED;
 164 }
 165
 166 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
 167
 168 /*
 169  * timer callback
 170  * reprogram the timer and call the interrupt job
 171  */
 172 static void snd_mpu401_uart_timer(unsigned long data)
 173 {
 174         struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
 175         unsigned long flags;
 176
 177         spin_lock_irqsave(&mpu->timer_lock, flags);
 178         /*mpu->mode |= MPU401_MODE_TIMER;*/
 179         mpu->timer.expires = 1 + jiffies;
 180         add_timer(&mpu->timer);
 181         spin_unlock_irqrestore(&mpu->timer_lock, flags);
 182         if (mpu->rmidi)
 183                 _snd_mpu401_uart_interrupt(mpu);
 184 }
 185
 186 /*
 187  * initialize the timer callback if not programmed yet
 188  */
 189 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
 190 {
 191         unsigned long flags;
 192
 193         spin_lock_irqsave (&mpu->timer_lock, flags);
 194         if (mpu->timer_invoked == 0) {
 195                 init_timer(&mpu->timer);
 196                 mpu->timer.data = (unsigned long)mpu;
 197                 mpu->timer.function = snd_mpu401_uart_timer;
 198                 mpu->timer.expires = 1 + jiffies;
 199                 add_timer(&mpu->timer);
 200         }
 201         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
 202                 MPU401_MODE_OUTPUT_TIMER;
 203         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 204 }
 205
 206 /*
 207  * remove the timer callback if still active
 208  */
 209 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
 210 {
 211         unsigned long flags;
 212
 213         spin_lock_irqsave (&mpu->timer_lock, flags);
 214         if (mpu->timer_invoked) {
 215                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
 216                         ~MPU401_MODE_OUTPUT_TIMER;
 217                 if (! mpu->timer_invoked)
 218                         del_timer(&mpu->timer);
 219         }
 220         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 221 }
 222
 223 /*
 224  * send a UART command
 225  * return zero if successful, non-zero for some errors
 226  */
 227
 228 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
 229                                int ack)
 230 {
 231         unsigned long flags;
 232         int timeout, ok;
 233
 234         spin_lock_irqsave(&mpu->input_lock, flags);
 235         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
 236                 mpu->write(mpu, 0x00, MPU401D(mpu));
 237                 /*snd_mpu401_uart_clear_rx(mpu);*/
 238         }
 239         /* ok. standard MPU-401 initialization */
 240         if (mpu->hardware != MPU401_HW_SB) {
 241                 for (timeout = 1000; timeout > 0 &&
 242                              !snd_mpu401_output_ready(mpu); timeout--)
 243                         udelay(10);
 244 #ifdef CONFIG_SND_DEBUG
 245                 if (!timeout)
 246                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
 247                                    mpu->read(mpu, MPU401C(mpu)));
 248 #endif
 249         }
 250         mpu->write(mpu, cmd, MPU401C(mpu));
 251         if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
 252                 ok = 0;
 253                 timeout = 10000;
 254                 while (!ok && timeout-- > 0) {
 255                         if (snd_mpu401_input_avail(mpu)) {
 256                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 257                                         ok = 1;
 258                         }
 259                 }
 260                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 261                         ok = 1;
 262         } else
 263                 ok = 1;
 264         spin_unlock_irqrestore(&mpu->input_lock, flags);
 265         if (!ok) {
 266                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
 267                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
 268                            mpu->read(mpu, MPU401C(mpu)),
 269                            mpu->read(mpu, MPU401D(mpu)));
 270                 return 1;
 271         }
 272         return 0;
 273 }
 274
 275 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
 276 {
 277         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
 278                 return -EIO;
 279         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
 280                 return -EIO;
 281         return 0;
 282 }
 283
 284 /*
 285  * input/output open/close - protected by open_mutex in rawmidi.c
 286  */
 287 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
 288 {
 289         struct snd_mpu401 *mpu;
 290         int err;
 291
 292         mpu = substream->rmidi->private_data;
 293         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
 294                 return err;
 295         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
 296                 if (snd_mpu401_do_reset(mpu) < 0)
 297                         goto error_out;
 298         }
 299         mpu->substream_input = substream;
 300         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 301         return 0;
 302
 303 error_out:
 304         if (mpu->open_input && mpu->close_input)
 305                 mpu->close_input(mpu);
 306         return -EIO;
 307 }
 308
 309 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
 310 {
 311         struct snd_mpu401 *mpu;
 312         int err;
 313
 314         mpu = substream->rmidi->private_data;
 315         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
 316                 return err;
 317         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
 318                 if (snd_mpu401_do_reset(mpu) < 0)
 319                         goto error_out;
 320         }
 321         mpu->substream_output = substream;
 322         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 323         return 0;
 324
 325 error_out:
 326         if (mpu->open_output && mpu->close_output)
 327                 mpu->close_output(mpu);
 328         return -EIO;
 329 }
 330
 331 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
 332 {
 333         struct snd_mpu401 *mpu;
 334         int err = 0;
 335
 336         mpu = substream->rmidi->private_data;
 337         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 338         mpu->substream_input = NULL;
 339         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
 340                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 341         if (mpu->close_input)
 342                 mpu->close_input(mpu);
 343         if (err)
 344                 return -EIO;
 345         return 0;
 346 }
 347
 348 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
 349 {
 350         struct snd_mpu401 *mpu;
 351         int err = 0;
 352
 353         mpu = substream->rmidi->private_data;
 354         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 355         mpu->substream_output = NULL;
 356         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 357                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 358         if (mpu->close_output)
 359                 mpu->close_output(mpu);
 360         if (err)
 361                 return -EIO;
 362         return 0;
 363 }
 364
 365 /*
 366  * trigger input callback
 367  */
 368 static void
 369 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 370 {
 371         unsigned long flags;
 372         struct snd_mpu401 *mpu;
 373         int max = 64;
 374
 375         mpu = substream->rmidi->private_data;
 376         if (up) {
 377                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
 378                                        &mpu->mode)) {
 379                         /* first time - flush FIFO */
 380                         while (max-- > 0)
 381                                 mpu->read(mpu, MPU401D(mpu));
 382                         if (mpu->info_flags & MPU401_INFO_USE_TIMER)
 383                                 snd_mpu401_uart_add_timer(mpu, 1);
 384                 }
 385
 386                 /* read data in advance */
 387                 spin_lock_irqsave(&mpu->input_lock, flags);
 388                 snd_mpu401_uart_input_read(mpu);
 389                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 390         } else {
 391                 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
 392                         snd_mpu401_uart_remove_timer(mpu, 1);
 393                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
 394         }
 395
 396 }
 397
 398 /*
 399  * transfer input pending data
 400  * call with input_lock spinlock held
 401  */
 402 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
 403 {
 404         int max = 128;
 405         unsigned char byte;
 406
 407         while (max-- > 0) {
 408                 if (! snd_mpu401_input_avail(mpu))
 409                         break; /* input not available */
 410                 byte = mpu->read(mpu, MPU401D(mpu));
 411                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
 412                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
 413         }
 414 }
 415
 416 /*
 417  *  Tx FIFO sizes:
 418  *    CS4237B                   - 16 bytes
 419  *    AudioDrive ES1688         - 12 bytes
 420  *    S3 SonicVibes             -  8 bytes
 421  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
 422  */
 423
 424 /*
 425  * write output pending bytes
 426  * call with output_lock spinlock held
 427  */
 428 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
 429 {
 430         unsigned char byte;
 431         int max = 256;
 432
 433         do {
 434                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
 435                                               &byte, 1) == 1) {
 436                         /*
 437                          * Try twice because there is hardware that insists on
 438                          * setting the output busy bit after each write.
 439                          */
 440                         if (!snd_mpu401_output_ready(mpu) &&
 441                             !snd_mpu401_output_ready(mpu))
 442                                 break;  /* Tx FIFO full - try again later */
 443                         mpu->write(mpu, byte, MPU401D(mpu));
 444                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
 445                 } else {
 446                         snd_mpu401_uart_remove_timer (mpu, 0);
 447                         break;  /* no other data - leave the tx loop */
 448                 }
 449         } while (--max > 0);
 450 }
 451
 452 /*
 453  * output trigger callback
 454  */
 455 static void
 456 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 457 {
 458         unsigned long flags;
 459         struct snd_mpu401 *mpu;
 460
 461         mpu = substream->rmidi->private_data;
 462         if (up) {
 463                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 464
 465                 /* try to add the timer at each output trigger,
 466                  * since the output timer might have been removed in
 467                  * snd_mpu401_uart_output_write().
 468                  */
 469                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 470                         snd_mpu401_uart_add_timer(mpu, 0);
 471
 472                 /* output pending data */
 473                 spin_lock_irqsave(&mpu->output_lock, flags);
 474                 snd_mpu401_uart_output_write(mpu);
 475                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 476         } else {
 477                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 478                         snd_mpu401_uart_remove_timer(mpu, 0);
 479                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 480         }
 481 }
 482
 483 /*
 484
 485  */
 486
 487 static struct snd_rawmidi_ops snd_mpu401_uart_output =
 488 {
 489         .open =         snd_mpu401_uart_output_open,
 490         .close =        snd_mpu401_uart_output_close,
 491         .trigger =      snd_mpu401_uart_output_trigger,
 492 };
 493
 494 static struct snd_rawmidi_ops snd_mpu401_uart_input =
 495 {
 496         .open =         snd_mpu401_uart_input_open,
 497         .close =        snd_mpu401_uart_input_close,
 498         .trigger =      snd_mpu401_uart_input_trigger,
 499 };
 500
 501 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
 502 {
 503         struct snd_mpu401 *mpu = rmidi->private_data;
 504         if (mpu->irq >= 0)
 505                 free_irq(mpu->irq, (void *) mpu);
 506         release_and_free_resource(mpu->res);
 507         kfree(mpu);
 508 }
 509
 510 /**
 511  * snd_mpu401_uart_new - create an MPU401-UART instance
 512  * @card: the card instance
 513  * @device: the device index, zero-based
 514  * @hardware: the hardware type, MPU401_HW_XXXX
 515  * @port: the base address of MPU401 port
 516  * @info_flags: bitflags MPU401_INFO_XXX
 517  * @irq: the ISA irq number, -1 if not to be allocated
 518  * @rrawmidi: the pointer to store the new rawmidi instance
 519  *
 520  * Creates a new MPU-401 instance.
 521  *
 522  * Note that the rawmidi instance is returned on the rrawmidi argument,
 523  * not the mpu401 instance itself.  To access to the mpu401 instance,
 524  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
 525  *
 526  * Return: Zero if successful, or a negative error code.
 527  */
 528 int snd_mpu401_uart_new(struct snd_card *card, int device,
 529                         unsigned short hardware,
 530                         unsigned long port,
 531                         unsigned int info_flags,
 532                         int irq,
 533                         struct snd_rawmidi ** rrawmidi)
 534 {
 535         struct snd_mpu401 *mpu;
 536         struct snd_rawmidi *rmidi;
 537         int in_enable, out_enable;
 538         int err;
 539
 540         if (rrawmidi)
 541                 *rrawmidi = NULL;
 542         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
 543                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
 544         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
 545         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
 546         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
 547                                    out_enable, in_enable, &rmidi)) < 0)
 548                 return err;
 549         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
 550         if (mpu == NULL) {
 551                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
 552                 snd_device_free(card, rmidi);
 553                 return -ENOMEM;
 554         }
 555         rmidi->private_data = mpu;
 556         rmidi->private_free = snd_mpu401_uart_free;
 557         spin_lock_init(&mpu->input_lock);
 558         spin_lock_init(&mpu->output_lock);
 559         spin_lock_init(&mpu->timer_lock);
 560         mpu->hardware = hardware;
 561         mpu->irq = -1;
 562         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
 563                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
 564                 mpu->res = request_region(port, res_size, "MPU401 UART");
 565                 if (mpu->res == NULL) {
 566                         snd_printk(KERN_ERR "mpu401_uart: "
 567                                    "unable to grab port 0x%lx size %d\n",
 568                                    port, res_size);
 569                         snd_device_free(card, rmidi);
 570                         return -EBUSY;
 571                 }
 572         }
 573         if (info_flags & MPU401_INFO_MMIO) {
 574                 mpu->write = mpu401_write_mmio;
 575                 mpu->read = mpu401_read_mmio;
 576         } else {
 577                 mpu->write = mpu401_write_port;
 578                 mpu->read = mpu401_read_port;
 579         }
 580         mpu->port = port;
 581         if (hardware == MPU401_HW_PC98II)
 582                 mpu->cport = port + 2;
 583         else
 584                 mpu->cport = port + 1;
 585         if (irq >= 0) {
 586                 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
 587                                 "MPU401 UART", (void *) mpu)) {
 588                         snd_printk(KERN_ERR "mpu401_uart: "
 589                                    "unable to grab IRQ %d\n", irq);
 590                         snd_device_free(card, rmidi);
 591                         return -EBUSY;
 592                 }
 593         }
 594         if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
 595                 info_flags |= MPU401_INFO_USE_TIMER;
 596         mpu->info_flags = info_flags;
 597         mpu->irq = irq;
 598         if (card->shortname[0])
 599                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
 600                          card->shortname);
 601         else
 602                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
 603         if (out_enable) {
 604                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 605                                     &snd_mpu401_uart_output);
 606                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 607         }
 608         if (in_enable) {
 609                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 610                                     &snd_mpu401_uart_input);
 611                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 612                 if (out_enable)
 613                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 614         }
 615         mpu->rmidi = rmidi;
 616         if (rrawmidi)
 617                 *rrawmidi = rmidi;
 618         return 0;
 619 }
 620
 621 EXPORT_SYMBOL(snd_mpu401_uart_new);
 622
 623 /*
 624  *  INIT part
 625  */
 626
 627 static int __init alsa_mpu401_uart_init(void)
 628 {
 629         return 0;
 630 }
 631
 632 static void __exit alsa_mpu401_uart_exit(void)
 633 {
 634 }
 635
 636 module_init(alsa_mpu401_uart_init)
 637 module_exit(alsa_mpu401_uart_exit)