sound/drivers/mpu401/mpu401_uart.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Routines for control of MPU-401 in UART mode
   4  *
   5  *  MPU-401 supports UART mode which is not capable generate transmit
   6  *  interrupts thus output is done via polling. Also, if irq < 0, then
   7  *  input is done also via polling. Do not expect good performance.
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  *   13-03-2003:
  25  *      Added support for different kind of hardware I/O. Build in choices
  26  *      are port and mmio. For other kind of I/O, set mpu->read and
  27  *      mpu->write to your own I/O functions.
  28  *
  29  */
  30
  31 #include <sound/driver.h>
  32 #include <asm/io.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/ioport.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/errno.h>
  39 #include <sound/core.h>
  40 #include <sound/mpu401.h>
  41
  42 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  43 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
  44 MODULE_LICENSE("GPL");
  45
  46 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
  47 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
  48
  49 /*
  50
  51  */
  52
  53 #define snd_mpu401_input_avail(mpu)     (!(mpu->read(mpu, MPU401C(mpu)) & 0x80))
  54 #define snd_mpu401_output_ready(mpu)    (!(mpu->read(mpu, MPU401C(mpu)) & 0x40))
  55
  56 #define MPU401_RESET            0xff
  57 #define MPU401_ENTER_UART       0x3f
  58 #define MPU401_ACK              0xfe
  59
  60 /* Build in lowlevel io */
  61 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
  62                               unsigned long addr)
  63 {
  64         outb(data, addr);
  65 }
  66
  67 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
  68                                       unsigned long addr)
  69 {
  70         return inb(addr);
  71 }
  72
  73 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
  74                               unsigned long addr)
  75 {
  76         writeb(data, (void __iomem *)addr);
  77 }
  78
  79 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
  80                                       unsigned long addr)
  81 {
  82         return readb((void __iomem *)addr);
  83 }
  84 /*  */
  85
  86 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
  87 {
  88         int timeout = 100000;
  89         for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
  90                 mpu->read(mpu, MPU401D(mpu));
  91 #ifdef CONFIG_SND_DEBUG
  92         if (timeout <= 0)
  93                 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
  94                            mpu->read(mpu, MPU401C(mpu)));
  95 #endif
  96 }
  97
  98 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
  99 {
 100         if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
 101             test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
 102                 spin_lock(&mpu->output_lock);
 103                 snd_mpu401_uart_output_write(mpu);
 104                 spin_unlock(&mpu->output_lock);
 105         }
 106 }
 107
 108 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
 109 {
 110         if (mpu->info_flags & MPU401_INFO_INPUT) {
 111                 spin_lock(&mpu->input_lock);
 112                 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 113                         snd_mpu401_uart_input_read(mpu);
 114                 else
 115                         snd_mpu401_uart_clear_rx(mpu);
 116                 spin_unlock(&mpu->input_lock);
 117         }
 118         if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 119                 /* ok. for better Tx performance try do some output
 120                    when input is done */
 121                 uart_interrupt_tx(mpu);
 122 }
 123
 124 /**
 125  * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
 126  * @irq: the irq number
 127  * @dev_id: mpu401 instance
 128  *
 129  * Processes the interrupt for MPU401-UART i/o.
 130  */
 131 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
 132 {
 133         struct snd_mpu401 *mpu = dev_id;
 134
 135         if (mpu == NULL)
 136                 return IRQ_NONE;
 137         _snd_mpu401_uart_interrupt(mpu);
 138         return IRQ_HANDLED;
 139 }
 140
 141 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
 142
 143 /**
 144  * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
 145  * @irq: the irq number
 146  * @dev_id: mpu401 instance
 147  *
 148  * Processes the interrupt for MPU401-UART output.
 149  */
 150 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
 151 {
 152         struct snd_mpu401 *mpu = dev_id;
 153
 154         if (mpu == NULL)
 155                 return IRQ_NONE;
 156         uart_interrupt_tx(mpu);
 157         return IRQ_HANDLED;
 158 }
 159
 160 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
 161
 162 /*
 163  * timer callback
 164  * reprogram the timer and call the interrupt job
 165  */
 166 static void snd_mpu401_uart_timer(unsigned long data)
 167 {
 168         struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
 169         unsigned long flags;
 170
 171         spin_lock_irqsave(&mpu->timer_lock, flags);
 172         /*mpu->mode |= MPU401_MODE_TIMER;*/
 173         mpu->timer.expires = 1 + jiffies;
 174         add_timer(&mpu->timer);
 175         spin_unlock_irqrestore(&mpu->timer_lock, flags);
 176         if (mpu->rmidi)
 177                 _snd_mpu401_uart_interrupt(mpu);
 178 }
 179
 180 /*
 181  * initialize the timer callback if not programmed yet
 182  */
 183 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
 184 {
 185         unsigned long flags;
 186
 187         spin_lock_irqsave (&mpu->timer_lock, flags);
 188         if (mpu->timer_invoked == 0) {
 189                 init_timer(&mpu->timer);
 190                 mpu->timer.data = (unsigned long)mpu;
 191                 mpu->timer.function = snd_mpu401_uart_timer;
 192                 mpu->timer.expires = 1 + jiffies;
 193                 add_timer(&mpu->timer);
 194         }
 195         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
 196                 MPU401_MODE_OUTPUT_TIMER;
 197         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 198 }
 199
 200 /*
 201  * remove the timer callback if still active
 202  */
 203 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
 204 {
 205         unsigned long flags;
 206
 207         spin_lock_irqsave (&mpu->timer_lock, flags);
 208         if (mpu->timer_invoked) {
 209                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
 210                         ~MPU401_MODE_OUTPUT_TIMER;
 211                 if (! mpu->timer_invoked)
 212                         del_timer(&mpu->timer);
 213         }
 214         spin_unlock_irqrestore (&mpu->timer_lock, flags);
 215 }
 216
 217 /*
 218  * send a UART command
 219  * return zero if successful, non-zero for some errors
 220  */
 221
 222 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
 223                                int ack)
 224 {
 225         unsigned long flags;
 226         int timeout, ok;
 227
 228         spin_lock_irqsave(&mpu->input_lock, flags);
 229         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
 230                 mpu->write(mpu, 0x00, MPU401D(mpu));
 231                 /*snd_mpu401_uart_clear_rx(mpu);*/
 232         }
 233         /* ok. standard MPU-401 initialization */
 234         if (mpu->hardware != MPU401_HW_SB) {
 235                 for (timeout = 1000; timeout > 0 &&
 236                              !snd_mpu401_output_ready(mpu); timeout--)
 237                         udelay(10);
 238 #ifdef CONFIG_SND_DEBUG
 239                 if (!timeout)
 240                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
 241                                    mpu->read(mpu, MPU401C(mpu)));
 242 #endif
 243         }
 244         mpu->write(mpu, cmd, MPU401C(mpu));
 245         if (ack) {
 246                 ok = 0;
 247                 timeout = 10000;
 248                 while (!ok && timeout-- > 0) {
 249                         if (snd_mpu401_input_avail(mpu)) {
 250                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 251                                         ok = 1;
 252                         }
 253                 }
 254                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
 255                         ok = 1;
 256         } else
 257                 ok = 1;
 258         spin_unlock_irqrestore(&mpu->input_lock, flags);
 259         if (!ok) {
 260                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
 261                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
 262                            mpu->read(mpu, MPU401C(mpu)),
 263                            mpu->read(mpu, MPU401D(mpu)));
 264                 return 1;
 265         }
 266         return 0;
 267 }
 268
 269 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
 270 {
 271         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
 272                 return -EIO;
 273         if (!(mpu->info_flags & MPU401_INFO_UART_ONLY) &&
 274             snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1))
 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, timeout;
 427
 428         do {
 429                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
 430                                               &byte, 1) == 1) {
 431                         for (timeout = 100; timeout > 0; timeout--) {
 432                                 if (snd_mpu401_output_ready(mpu))
 433                                         break;
 434                         }
 435                         if (timeout == 0)
 436                                 break;  /* Tx FIFO full - try again later */
 437                         mpu->write(mpu, byte, MPU401D(mpu));
 438                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
 439                 } else {
 440                         snd_mpu401_uart_remove_timer (mpu, 0);
 441                         break;  /* no other data - leave the tx loop */
 442                 }
 443         } while (--max > 0);
 444 }
 445
 446 /*
 447  * output trigger callback
 448  */
 449 static void
 450 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
 451 {
 452         unsigned long flags;
 453         struct snd_mpu401 *mpu;
 454
 455         mpu = substream->rmidi->private_data;
 456         if (up) {
 457                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 458
 459                 /* try to add the timer at each output trigger,
 460                  * since the output timer might have been removed in
 461                  * snd_mpu401_uart_output_write().
 462                  */
 463                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 464                         snd_mpu401_uart_add_timer(mpu, 0);
 465
 466                 /* output pending data */
 467                 spin_lock_irqsave(&mpu->output_lock, flags);
 468                 snd_mpu401_uart_output_write(mpu);
 469                 spin_unlock_irqrestore(&mpu->output_lock, flags);
 470         } else {
 471                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 472                         snd_mpu401_uart_remove_timer(mpu, 0);
 473                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
 474         }
 475 }
 476
 477 /*
 478
 479  */
 480
 481 static struct snd_rawmidi_ops snd_mpu401_uart_output =
 482 {
 483         .open =         snd_mpu401_uart_output_open,
 484         .close =        snd_mpu401_uart_output_close,
 485         .trigger =      snd_mpu401_uart_output_trigger,
 486 };
 487
 488 static struct snd_rawmidi_ops snd_mpu401_uart_input =
 489 {
 490         .open =         snd_mpu401_uart_input_open,
 491         .close =        snd_mpu401_uart_input_close,
 492         .trigger =      snd_mpu401_uart_input_trigger,
 493 };
 494
 495 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
 496 {
 497         struct snd_mpu401 *mpu = rmidi->private_data;
 498         if (mpu->irq_flags && mpu->irq >= 0)
 499                 free_irq(mpu->irq, (void *) mpu);
 500         release_and_free_resource(mpu->res);
 501         kfree(mpu);
 502 }
 503
 504 /**
 505  * snd_mpu401_uart_new - create an MPU401-UART instance
 506  * @card: the card instance
 507  * @device: the device index, zero-based
 508  * @hardware: the hardware type, MPU401_HW_XXXX
 509  * @port: the base address of MPU401 port
 510  * @info_flags: bitflags MPU401_INFO_XXX
 511  * @irq: the irq number, -1 if no interrupt for mpu
 512  * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
 513  * @rrawmidi: the pointer to store the new rawmidi instance
 514  *
 515  * Creates a new MPU-401 instance.
 516  *
 517  * Note that the rawmidi instance is returned on the rrawmidi argument,
 518  * not the mpu401 instance itself.  To access to the mpu401 instance,
 519  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
 520  *
 521  * Returns zero if successful, or a negative error code.
 522  */
 523 int snd_mpu401_uart_new(struct snd_card *card, int device,
 524                         unsigned short hardware,
 525                         unsigned long port,
 526                         unsigned int info_flags,
 527                         int irq, int irq_flags,
 528                         struct snd_rawmidi ** rrawmidi)
 529 {
 530         struct snd_mpu401 *mpu;
 531         struct snd_rawmidi *rmidi;
 532         int in_enable, out_enable;
 533         int err;
 534
 535         if (rrawmidi)
 536                 *rrawmidi = NULL;
 537         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
 538                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
 539         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
 540         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
 541         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
 542                                    out_enable, in_enable, &rmidi)) < 0)
 543                 return err;
 544         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
 545         if (mpu == NULL) {
 546                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
 547                 snd_device_free(card, rmidi);
 548                 return -ENOMEM;
 549         }
 550         rmidi->private_data = mpu;
 551         rmidi->private_free = snd_mpu401_uart_free;
 552         spin_lock_init(&mpu->input_lock);
 553         spin_lock_init(&mpu->output_lock);
 554         spin_lock_init(&mpu->timer_lock);
 555         mpu->hardware = hardware;
 556         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
 557                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
 558                 mpu->res = request_region(port, res_size, "MPU401 UART");
 559                 if (mpu->res == NULL) {
 560                         snd_printk(KERN_ERR "mpu401_uart: "
 561                                    "unable to grab port 0x%lx size %d\n",
 562                                    port, res_size);
 563                         snd_device_free(card, rmidi);
 564                         return -EBUSY;
 565                 }
 566         }
 567         if (info_flags & MPU401_INFO_MMIO) {
 568                 mpu->write = mpu401_write_mmio;
 569                 mpu->read = mpu401_read_mmio;
 570         } else {
 571                 mpu->write = mpu401_write_port;
 572                 mpu->read = mpu401_read_port;
 573         }
 574         mpu->port = port;
 575         if (hardware == MPU401_HW_PC98II)
 576                 mpu->cport = port + 2;
 577         else
 578                 mpu->cport = port + 1;
 579         if (irq >= 0 && irq_flags) {
 580                 if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
 581                                 "MPU401 UART", (void *) mpu)) {
 582                         snd_printk(KERN_ERR "mpu401_uart: "
 583                                    "unable to grab IRQ %d\n", irq);
 584                         snd_device_free(card, rmidi);
 585                         return -EBUSY;
 586                 }
 587         }
 588         mpu->info_flags = info_flags;
 589         mpu->irq = irq;
 590         mpu->irq_flags = irq_flags;
 591         if (card->shortname[0])
 592                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
 593                          card->shortname);
 594         else
 595                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
 596         if (out_enable) {
 597                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 598                                     &snd_mpu401_uart_output);
 599                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 600         }
 601         if (in_enable) {
 602                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 603                                     &snd_mpu401_uart_input);
 604                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 605                 if (out_enable)
 606                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 607         }
 608         mpu->rmidi = rmidi;
 609         if (rrawmidi)
 610                 *rrawmidi = rmidi;
 611         return 0;
 612 }
 613
 614 EXPORT_SYMBOL(snd_mpu401_uart_new);
 615
 616 /*
 617  *  INIT part
 618  */
 619
 620 static int __init alsa_mpu401_uart_init(void)
 621 {
 622         return 0;
 623 }
 624
 625 static void __exit alsa_mpu401_uart_exit(void)
 626 {
 627 }
 628
 629 module_init(alsa_mpu401_uart_init)
 630 module_exit(alsa_mpu401_uart_exit)