LXR linux/sound/drivers/mpu401/mpu401

   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
  42MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  43MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
  44MODULE_LICENSE("GPL");
  45
  46static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
  47static 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 */
  59static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
  60                              unsigned long addr)
  61{
  62        outb(data, addr);
  63}
  64
  65static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
  66                                      unsigned long addr)
  67{
  68        return inb(addr);
  69}
  70
  71static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
  72                              unsigned long addr)
  73{
  74        writeb(data, (void __iomem *)addr);
  75}
  76
  77static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
  78                                      unsigned long addr)
  79{
  80        return readb((void __iomem *)addr);
  81}
  82/*  */
  83
  84static 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
  96static 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
 108static 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 */
 135irqreturn_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
 145EXPORT_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 */
 156irqreturn_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
 166EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
 167
 168/*
 169 * timer callback
 170 * reprogram the timer and call the interrupt job
 171 */
 172static void snd_mpu401_uart_timer(struct timer_list *t)
 173{
 174        struct snd_mpu401 *mpu = from_timer(mpu, t, timer);
 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 */
 188static 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                timer_setup(&mpu->timer, snd_mpu401_uart_timer, 0);
 195                mod_timer(&mpu->timer, 1 + jiffies);
 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 */
 205static 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
 224static 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
 271static 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 */
 283static 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
 299error_out:
 300        if (mpu->open_input && mpu->close_input)
 301                mpu->close_input(mpu);
 302        return -EIO;
 303}
 304
 305static 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
 321error_out:
 322        if (mpu->open_output && mpu->close_output)
 323                mpu->close_output(mpu);
 324        return -EIO;
 325}
 326
 327static 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
 344static 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 */
 364static void
 365snd_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->info_flags & MPU401_INFO_USE_TIMER)
 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->info_flags & MPU401_INFO_USE_TIMER)
 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 */
 398static 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 */
 424static 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 */
 451static void
 452snd_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
 483static const 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
 490static const 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
 497static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
 498{
 499        struct snd_mpu401 *mpu = rmidi->private_data;
 500        if (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 ISA irq number, -1 if not to be allocated
 514 * @rrawmidi: the pointer to store the new rawmidi instance
 515 *
 516 * Creates a new MPU-401 instance.
 517 *
 518 * Note that the rawmidi instance is returned on the rrawmidi argument,
 519 * not the mpu401 instance itself.  To access to the mpu401 instance,
 520 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
 521 *
 522 * Return: Zero if successful, or a negative error code.
 523 */
 524int snd_mpu401_uart_new(struct snd_card *card, int device,
 525                        unsigned short hardware,
 526                        unsigned long port,
 527                        unsigned int info_flags,
 528                        int irq,
 529                        struct snd_rawmidi ** rrawmidi)
 530{
 531        struct snd_mpu401 *mpu;
 532        struct snd_rawmidi *rmidi;
 533        int in_enable, out_enable;
 534        int err;
 535
 536        if (rrawmidi)
 537                *rrawmidi = NULL;
 538        if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
 539                info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
 540        in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
 541        out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
 542        if ((err = snd_rawmidi_new(card, "MPU-401U", device,
 543                                   out_enable, in_enable, &rmidi)) < 0)
 544                return err;
 545        mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
 546        if (!mpu) {
 547                err = -ENOMEM;
 548                goto free_device;
 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        mpu->irq = -1;
 557        if (! (info_flags & MPU401_INFO_INTEGRATED)) {
 558                int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
 559                mpu->res = request_region(port, res_size, "MPU401 UART");
 560                if (!mpu->res) {
 561                        snd_printk(KERN_ERR "mpu401_uart: "
 562                                   "unable to grab port 0x%lx size %d\n",
 563                                   port, res_size);
 564                        err = -EBUSY;
 565                        goto free_device;
 566                }
 567        }
 568        if (info_flags & MPU401_INFO_MMIO) {
 569                mpu->write = mpu401_write_mmio;
 570                mpu->read = mpu401_read_mmio;
 571        } else {
 572                mpu->write = mpu401_write_port;
 573                mpu->read = mpu401_read_port;
 574        }
 575        mpu->port = port;
 576        if (hardware == MPU401_HW_PC98II)
 577                mpu->cport = port + 2;
 578        else
 579                mpu->cport = port + 1;
 580        if (irq >= 0) {
 581                if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
 582                                "MPU401 UART", (void *) mpu)) {
 583                        snd_printk(KERN_ERR "mpu401_uart: "
 584                                   "unable to grab IRQ %d\n", irq);
 585                        err = -EBUSY;
 586                        goto free_device;
 587                }
 588        }
 589        if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
 590                info_flags |= MPU401_INFO_USE_TIMER;
 591        mpu->info_flags = info_flags;
 592        mpu->irq = irq;
 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;
 614free_device:
 615        snd_device_free(card, rmidi);
 616        return err;
 617}
 618
 619EXPORT_SYMBOL(snd_mpu401_uart_new);
 620