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