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 <linux/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)
 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)
 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         mod_timer(&mpu->timer,  1 + jiffies);
 180         spin_unlock_irqrestore(&mpu->timer_lock, flags);
 181         if (mpu->rmidi)
 182                 _snd_mpu401_uart_interrupt(mpu);
 183 }
 184
 185 /*
 186  * initialize the timer callback if not programmed yet
 187  */
 188 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
 189 {
 190         unsigned long flags;
 191
 192         spin_lock_irqsave (&mpu->timer_lock, flags);
 193         if (mpu->timer_invoked == 0) {
 194                 setup_timer(&mpu->timer, snd_mpu401_uart_timer,
 195                             (unsigned long)mpu);
 196                 mod_timer(&mpu->timer, 1 + jiffies);
 197         }
 198         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
 199                 MPU401_MODE_OUTPUT_TIMER;
 200         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 201 }
 202
 203 /*
 204  * remove the timer callback if still active
 205  */
 206 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
 207 {
 208         unsigned long flags;
 209
 210         spin_lock_irqsave (&mpu->timer_lock, flags);
 211         if (mpu->timer_invoked) {
 212                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
 213                         ~MPU401_MODE_OUTPUT_TIMER;
 214                 if (! mpu->timer_invoked)
 215                         del_timer(&mpu->timer);
 216         }
 217         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 218 }
 219
 220 /*
 221  * send a UART command
 222  * return zero if successful, non-zero for some errors
 223  */
 224
 225 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
 226                                int ack)
 227 {
 228         unsigned long flags;
 229         int timeout, ok;
 230
 231         spin_lock_irqsave(&mpu->input_lock, flags);
 232         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
 233                 mpu->write(mpu, 0x00, MPU401D(mpu));
 234                 /*snd_mpu401_uart_clear_rx(mpu);*/
 235         }
 236         /* ok. standard MPU-401 initialization */
 237         if (mpu->hardware != MPU401_HW_SB) {
 238                 for (timeout = 1000; timeout > 0 &&
 239                              !snd_mpu401_output_ready(mpu); timeout--)
 240                         udelay(10);
 241 #ifdef CONFIG_SND_DEBUG
 242                 if (!timeout)
 243                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
 244                                    mpu->read(mpu, MPU401C(mpu)));
 245 #endif
 246         }
 247         mpu->write(mpu, cmd, MPU401C(mpu));
 248         if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
 249                 ok = 0;
 250                 timeout = 10000;
 251                 while (!ok && timeout-- > 0) {
 252                         if (snd_mpu401_input_avail(mpu)) {
 253                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 254                                         ok = 1;
 255                         }
 256                 }
 257                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 258                         ok = 1;
 259         } else
 260                 ok = 1;
 261         spin_unlock_irqrestore(&mpu->input_lock, flags);
 262         if (!ok) {
 263                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
 264                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
 265                            mpu->read(mpu, MPU401C(mpu)),
 266                            mpu->read(mpu, MPU401D(mpu)));
 267                 return 1;
 268         }
 269         return 0;
 270 }
 271
 272 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
 273 {
 274         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
 275                 return -EIO;
 276         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
 277                 return -EIO;
 278         return 0;
 279 }
 280
 281 /*
 282  * input/output open/close - protected by open_mutex in rawmidi.c
 283  */
 284 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
 285 {
 286         struct snd_mpu401 *mpu;
 287         int err;
 288
 289         mpu = substream->rmidi->private_data;
 290         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
 291                 return err;
 292         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
 293                 if (snd_mpu401_do_reset(mpu) < 0)
 294                         goto error_out;
 295         }
 296         mpu->substream_input = substream;
 297         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 298         return 0;
 299
 300 error_out:
 301         if (mpu->open_input && mpu->close_input)
 302                 mpu->close_input(mpu);
 303         return -EIO;
 304 }
 305
 306 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
 307 {
 308         struct snd_mpu401 *mpu;
 309         int err;
 310
 311         mpu = substream->rmidi->private_data;
 312         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
 313                 return err;
 314         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
 315                 if (snd_mpu401_do_reset(mpu) < 0)
 316                         goto error_out;
 317         }
 318         mpu->substream_output = substream;
 319         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 320         return 0;
 321
 322 error_out:
 323         if (mpu->open_output && mpu->close_output)
 324                 mpu->close_output(mpu);
 325         return -EIO;
 326 }
 327
 328 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
 329 {
 330         struct snd_mpu401 *mpu;
 331         int err = 0;
 332
 333         mpu = substream->rmidi->private_data;
 334         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
 335         mpu->substream_input = NULL;
 336         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
 337                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 338         if (mpu->close_input)
 339                 mpu->close_input(mpu);
 340         if (err)
 341                 return -EIO;
 342         return 0;
 343 }
 344
 345 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
 346 {
 347         struct snd_mpu401 *mpu;
 348         int err = 0;
 349
 350         mpu = substream->rmidi->private_data;
 351         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
 352         mpu->substream_output = NULL;
 353         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 354                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
 355         if (mpu->close_output)
 356                 mpu->close_output(mpu);
 357         if (err)
 358                 return -EIO;
 359         return 0;
 360 }
 361
 362 /*
 363  * trigger input callback
 364  */
 365 static void
 366 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
 367 {
 368         unsigned long flags;
 369         struct snd_mpu401 *mpu;
 370         int max = 64;
 371
 372         mpu = substream->rmidi->private_data;
 373         if (up) {
 374                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
 375                                        &mpu->mode)) {
 376                         /* first time - flush FIFO */
 377                         while (max-- > 0)
 378                                 mpu->read(mpu, MPU401D(mpu));
 379                         if (mpu->info_flags & MPU401_INFO_USE_TIMER)
 380                                 snd_mpu401_uart_add_timer(mpu, 1);
 381                 }
 382
 383                 /* read data in advance */
 384                 spin_lock_irqsave(&mpu->input_lock, flags);
 385                 snd_mpu401_uart_input_read(mpu);
 386                 spin_unlock_irqrestore(&mpu->input_lock, flags);
 387         } else {
 388                 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
 389                         snd_mpu401_uart_remove_timer(mpu, 1);
 390                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
 391         }
 392
 393 }
 394
 395 /*
 396  * transfer input pending data
 397  * call with input_lock spinlock held
 398  */
 399 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
 400 {
 401         int max = 128;
 402         unsigned char byte;
 403
 404         while (max-- > 0) {
 405                 if (! snd_mpu401_input_avail(mpu))
 406                         break; /* input not available */
 407                 byte = mpu->read(mpu, MPU401D(mpu));
 408                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
 409                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
 410         }
 411 }
 412
 413 /*
 414  *  Tx FIFO sizes:
 415  *    CS4237B                   - 16 bytes
 416  *    AudioDrive ES1688         - 12 bytes
 417  *    S3 SonicVibes             -  8 bytes
 418  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
 419  */
 420
 421 /*
 422  * write output pending bytes
 423  * call with output_lock spinlock held
 424  */
 425 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
 426 {
 427         unsigned char byte;
 428         int max = 256;
 429
 430         do {
 431                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
 432                                               &byte, 1) == 1) {
 433                         /*
 434                          * Try twice because there is hardware that insists on
 435                          * setting the output busy bit after each write.
 436                          */
 437                         if (!snd_mpu401_output_ready(mpu) &&
 438                             !snd_mpu401_output_ready(mpu))
 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 const 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 const 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 >= 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 ISA irq number, -1 if not to be allocated
 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  * Return: 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,
 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) {
 548                 err = -ENOMEM;
 549                 goto free_device;
 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         mpu->irq = -1;
 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) {
 562                         snd_printk(KERN_ERR "mpu401_uart: "
 563                                    "unable to grab port 0x%lx size %d\n",
 564                                    port, res_size);
 565                         err = -EBUSY;
 566                         goto free_device;
 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) {
 582                 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
 583                                 "MPU401 UART", (void *) mpu)) {
 584                         snd_printk(KERN_ERR "mpu401_uart: "
 585                                    "unable to grab IRQ %d\n", irq);
 586                         err = -EBUSY;
 587                         goto free_device;
 588                 }
 589         }
 590         if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
 591                 info_flags |= MPU401_INFO_USE_TIMER;
 592         mpu->info_flags = info_flags;
 593         mpu->irq = irq;
 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 free_device:
 616         snd_device_free(card, rmidi);
 617         return err;
 618 }
 619
 620 EXPORT_SYMBOL(snd_mpu401_uart_new);
 621
 622 /*
 623  *  INIT part
 624  */
 625
 626 static int __init alsa_mpu401_uart_init(void)
 627 {
 628         return 0;
 629 }
 630
 631 static void __exit alsa_mpu401_uart_exit(void)
 632 {
 633 }
 634
 635 module_init(alsa_mpu401_uart_init)
 636 module_exit(alsa_mpu401_uart_exit)