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rawmidi.c

/*
 *  Abstract layer for MIDI v1.0 stream
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <sound/core.h>
#include <linux/major.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <sound/rawmidi.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/minors.h>
#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
MODULE_LICENSE("GPL");

#ifdef CONFIG_SND_OSSEMUL
static int midi_map[SNDRV_CARDS];
static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
module_param_array(midi_map, int, NULL, 0444);
MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
module_param_array(amidi_map, int, NULL, 0444);
MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
#endif /* CONFIG_SND_OSSEMUL */

static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
static int snd_rawmidi_dev_free(struct snd_device *device);
static int snd_rawmidi_dev_register(struct snd_device *device);
static int snd_rawmidi_dev_disconnect(struct snd_device *device);

static LIST_HEAD(snd_rawmidi_devices);
static DEFINE_MUTEX(register_mutex);

static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
{
      struct list_head *p;
      struct snd_rawmidi *rawmidi;

      list_for_each(p, &snd_rawmidi_devices) {
            rawmidi = list_entry(p, struct snd_rawmidi, list);
            if (rawmidi->card == card && rawmidi->device == device)
                  return rawmidi;
      }
      return NULL;
}

static inline unsigned short snd_rawmidi_file_flags(struct file *file)
{
      switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
      case FMODE_WRITE:
            return SNDRV_RAWMIDI_LFLG_OUTPUT;
      case FMODE_READ:
            return SNDRV_RAWMIDI_LFLG_INPUT;
      default:
            return SNDRV_RAWMIDI_LFLG_OPEN;
      }
}

static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;
      return runtime->avail >= runtime->avail_min;
}

static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
                                 size_t count)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;
      return runtime->avail >= runtime->avail_min &&
             (!substream->append || runtime->avail >= count);
}

static void snd_rawmidi_input_event_tasklet(unsigned long data)
{
      struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
      substream->runtime->event(substream);
}

static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
{
      struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
      substream->ops->trigger(substream, 1);
}

static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
{
      struct snd_rawmidi_runtime *runtime;

      if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
            return -ENOMEM;
      spin_lock_init(&runtime->lock);
      init_waitqueue_head(&runtime->sleep);
      if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
            tasklet_init(&runtime->tasklet,
                       snd_rawmidi_input_event_tasklet,
                       (unsigned long)substream);
      else
            tasklet_init(&runtime->tasklet,
                       snd_rawmidi_output_trigger_tasklet,
                       (unsigned long)substream);
      runtime->event = NULL;
      runtime->buffer_size = PAGE_SIZE;
      runtime->avail_min = 1;
      if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
            runtime->avail = 0;
      else
            runtime->avail = runtime->buffer_size;
      if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
            kfree(runtime);
            return -ENOMEM;
      }
      runtime->appl_ptr = runtime->hw_ptr = 0;
      substream->runtime = runtime;
      return 0;
}

static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      kfree(runtime->buffer);
      kfree(runtime);
      substream->runtime = NULL;
      return 0;
}

static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
{
      if (up) {
            tasklet_hi_schedule(&substream->runtime->tasklet);
      } else {
            tasklet_kill(&substream->runtime->tasklet);
            substream->ops->trigger(substream, 0);
      }
}

static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
      substream->ops->trigger(substream, up);
      if (!up && substream->runtime->event)
            tasklet_kill(&substream->runtime->tasklet);
}

int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      snd_rawmidi_output_trigger(substream, 0);
      runtime->drain = 0;
      spin_lock_irqsave(&runtime->lock, flags);
      runtime->appl_ptr = runtime->hw_ptr = 0;
      runtime->avail = runtime->buffer_size;
      spin_unlock_irqrestore(&runtime->lock, flags);
      return 0;
}

int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
{
      int err;
      long timeout;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      err = 0;
      runtime->drain = 1;
      timeout = wait_event_interruptible_timeout(runtime->sleep,
                        (runtime->avail >= runtime->buffer_size),
                        10*HZ);
      if (signal_pending(current))
            err = -ERESTARTSYS;
      if (runtime->avail < runtime->buffer_size && !timeout) {
            snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
            err = -EIO;
      }
      runtime->drain = 0;
      if (err != -ERESTARTSYS) {
            /* we need wait a while to make sure that Tx FIFOs are empty */
            if (substream->ops->drain)
                  substream->ops->drain(substream);
            else
                  msleep(50);
            snd_rawmidi_drop_output(substream);
      }
      return err;
}

int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
{
      unsigned long flags;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      snd_rawmidi_input_trigger(substream, 0);
      runtime->drain = 0;
      spin_lock_irqsave(&runtime->lock, flags);
      runtime->appl_ptr = runtime->hw_ptr = 0;
      runtime->avail = 0;
      spin_unlock_irqrestore(&runtime->lock, flags);
      return 0;
}

int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
                      int mode, struct snd_rawmidi_file * rfile)
{
      struct snd_rawmidi *rmidi;
      struct list_head *list1, *list2;
      struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
      struct snd_rawmidi_runtime *input = NULL, *output = NULL;
      int err;

      if (rfile)
            rfile->input = rfile->output = NULL;
      mutex_lock(&register_mutex);
      rmidi = snd_rawmidi_search(card, device);
      mutex_unlock(&register_mutex);
      if (rmidi == NULL) {
            err = -ENODEV;
            goto __error1;
      }
      if (!try_module_get(rmidi->card->module)) {
            err = -EFAULT;
            goto __error1;
      }
      if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
            mutex_lock(&rmidi->open_mutex);
      if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
            if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
                  err = -ENXIO;
                  goto __error;
            }
            if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
                  err = -ENODEV;
                  goto __error;
            }
            if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
                rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
                  err = -EAGAIN;
                  goto __error;
            }
      }
      if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
            if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
                  err = -ENXIO;
                  goto __error;
            }
            if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
                  err = -ENODEV;
                  goto __error;
            }
            if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
                rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
                  err = -EAGAIN;
                  goto __error;
            }
      }
      list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
      while (1) {
            if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
                  sinput = NULL;
                  if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
                        err = -EAGAIN;
                        goto __error;
                  }
                  break;
            }
            sinput = list_entry(list1, struct snd_rawmidi_substream, list);
            if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
                  goto __nexti;
            if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
                  break;
            __nexti:
            list1 = list1->next;
      }
      list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
      while (1) {
            if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
                  soutput = NULL;
                  if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
                        err = -EAGAIN;
                        goto __error;
                  }
                  break;
            }
            soutput = list_entry(list2, struct snd_rawmidi_substream, list);
            if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
                  if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
                        if (soutput->opened && !soutput->append)
                              goto __nexto;
                  } else {
                        if (soutput->opened)
                              goto __nexto;
                  }
            }
            if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
                  break;
            __nexto:
            list2 = list2->next;
      }
      if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
            if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
                  goto __error;
            input = sinput->runtime;
            if ((err = sinput->ops->open(sinput)) < 0)
                  goto __error;
            sinput->opened = 1;
            rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
      } else {
            sinput = NULL;
      }
      if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
            if (soutput->opened)
                  goto __skip_output;
            if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
                  if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
                        sinput->ops->close(sinput);
                  goto __error;
            }
            output = soutput->runtime;
            if ((err = soutput->ops->open(soutput)) < 0) {
                  if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
                        sinput->ops->close(sinput);
                  goto __error;
            }
            __skip_output:
            soutput->opened = 1;
            if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
                  soutput->append = 1;
                  if (soutput->use_count++ == 0)
                  soutput->active_sensing = 1;
            rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
      } else {
            soutput = NULL;
      }
      if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
            mutex_unlock(&rmidi->open_mutex);
      if (rfile) {
            rfile->rmidi = rmidi;
            rfile->input = sinput;
            rfile->output = soutput;
      }
      return 0;

      __error:
      if (input != NULL)
            snd_rawmidi_runtime_free(sinput);
      if (output != NULL)
            snd_rawmidi_runtime_free(soutput);
      module_put(rmidi->card->module);
      if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
            mutex_unlock(&rmidi->open_mutex);
      __error1:
      return err;
}

static int snd_rawmidi_open(struct inode *inode, struct file *file)
{
      int maj = imajor(inode);
      struct snd_card *card;
      int subdevice;
      unsigned short fflags;
      int err;
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_file *rawmidi_file;
      wait_queue_t wait;
      struct list_head *list;
      struct snd_ctl_file *kctl;

      if (maj == snd_major) {
            rmidi = snd_lookup_minor_data(iminor(inode),
                                    SNDRV_DEVICE_TYPE_RAWMIDI);
#ifdef CONFIG_SND_OSSEMUL
      } else if (maj == SOUND_MAJOR) {
            rmidi = snd_lookup_oss_minor_data(iminor(inode),
                                      SNDRV_OSS_DEVICE_TYPE_MIDI);
#endif
      } else
            return -ENXIO;

      if (rmidi == NULL)
            return -ENODEV;
      if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 
            return -EINVAL;         /* invalid combination */
      card = rmidi->card;
      err = snd_card_file_add(card, file);
      if (err < 0)
            return -ENODEV;
      fflags = snd_rawmidi_file_flags(file);
      if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
            fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
      fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
      rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
      if (rawmidi_file == NULL) {
            snd_card_file_remove(card, file);
            return -ENOMEM;
      }
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&rmidi->open_wait, &wait);
      mutex_lock(&rmidi->open_mutex);
      while (1) {
            subdevice = -1;
            down_read(&card->controls_rwsem);
            list_for_each(list, &card->ctl_files) {
                  kctl = snd_ctl_file(list);
                  if (kctl->pid == current->pid) {
                        subdevice = kctl->prefer_rawmidi_subdevice;
                        if (subdevice != -1)
                              break;
                  }
            }
            up_read(&card->controls_rwsem);
            err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
                                    subdevice, fflags, rawmidi_file);
            if (err >= 0)
                  break;
            if (err == -EAGAIN) {
                  if (file->f_flags & O_NONBLOCK) {
                        err = -EBUSY;
                        break;
                  }
            } else
                  break;
            set_current_state(TASK_INTERRUPTIBLE);
            mutex_unlock(&rmidi->open_mutex);
            schedule();
            mutex_lock(&rmidi->open_mutex);
            if (signal_pending(current)) {
                  err = -ERESTARTSYS;
                  break;
            }
      }
#ifdef CONFIG_SND_OSSEMUL
      if (rawmidi_file->input && rawmidi_file->input->runtime)
            rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
      if (rawmidi_file->output && rawmidi_file->output->runtime)
            rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
#endif
      remove_wait_queue(&rmidi->open_wait, &wait);
      if (err >= 0) {
            file->private_data = rawmidi_file;
      } else {
            snd_card_file_remove(card, file);
            kfree(rawmidi_file);
      }
      mutex_unlock(&rmidi->open_mutex);
      return err;
}

int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
{
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_substream *substream;
      struct snd_rawmidi_runtime *runtime;

      snd_assert(rfile != NULL, return -ENXIO);
      snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
      rmidi = rfile->rmidi;
      mutex_lock(&rmidi->open_mutex);
      if (rfile->input != NULL) {
            substream = rfile->input;
            rfile->input = NULL;
            runtime = substream->runtime;
            snd_rawmidi_input_trigger(substream, 0);
            substream->ops->close(substream);
            if (runtime->private_free != NULL)
                  runtime->private_free(substream);
            snd_rawmidi_runtime_free(substream);
            substream->opened = 0;
            rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
      }
      if (rfile->output != NULL) {
            substream = rfile->output;
            rfile->output = NULL;
            if (--substream->use_count == 0) {
                  runtime = substream->runtime;
                  if (substream->active_sensing) {
                        unsigned char buf = 0xfe;
                        /* sending single active sensing message to shut the device up */
                        snd_rawmidi_kernel_write(substream, &buf, 1);
                  }
                  if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
                        snd_rawmidi_output_trigger(substream, 0);
                  substream->ops->close(substream);
                  if (runtime->private_free != NULL)
                        runtime->private_free(substream);
                  snd_rawmidi_runtime_free(substream);
                  substream->opened = 0;
                  substream->append = 0;
            }
            rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
      }
      mutex_unlock(&rmidi->open_mutex);
      module_put(rmidi->card->module);
      return 0;
}

static int snd_rawmidi_release(struct inode *inode, struct file *file)
{
      struct snd_rawmidi_file *rfile;
      struct snd_rawmidi *rmidi;
      int err;

      rfile = file->private_data;
      err = snd_rawmidi_kernel_release(rfile);
      rmidi = rfile->rmidi;
      wake_up(&rmidi->open_wait);
      kfree(rfile);
      snd_card_file_remove(rmidi->card, file);
      return err;
}

static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
                      struct snd_rawmidi_info *info)
{
      struct snd_rawmidi *rmidi;
      
      if (substream == NULL)
            return -ENODEV;
      rmidi = substream->rmidi;
      memset(info, 0, sizeof(*info));
      info->card = rmidi->card->number;
      info->device = rmidi->device;
      info->subdevice = substream->number;
      info->stream = substream->stream;
      info->flags = rmidi->info_flags;
      strcpy(info->id, rmidi->id);
      strcpy(info->name, rmidi->name);
      strcpy(info->subname, substream->name);
      info->subdevices_count = substream->pstr->substream_count;
      info->subdevices_avail = (substream->pstr->substream_count -
                          substream->pstr->substream_opened);
      return 0;
}

static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
                         struct snd_rawmidi_info __user * _info)
{
      struct snd_rawmidi_info info;
      int err;
      if ((err = snd_rawmidi_info(substream, &info)) < 0)
            return err;
      if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
            return -EFAULT;
      return 0;
}

int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
{
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_str *pstr;
      struct snd_rawmidi_substream *substream;
      struct list_head *list;

      mutex_lock(&register_mutex);
      rmidi = snd_rawmidi_search(card, info->device);
      mutex_unlock(&register_mutex);
      if (!rmidi)
            return -ENXIO;
      if (info->stream < 0 || info->stream > 1)
            return -EINVAL;
      pstr = &rmidi->streams[info->stream];
      if (pstr->substream_count == 0)
            return -ENOENT;
      if (info->subdevice >= pstr->substream_count)
            return -ENXIO;
      list_for_each(list, &pstr->substreams) {
            substream = list_entry(list, struct snd_rawmidi_substream, list);
            if ((unsigned int)substream->number == info->subdevice)
                  return snd_rawmidi_info(substream, info);
      }
      return -ENXIO;
}

static int snd_rawmidi_info_select_user(struct snd_card *card,
                              struct snd_rawmidi_info __user *_info)
{
      int err;
      struct snd_rawmidi_info info;
      if (get_user(info.device, &_info->device))
            return -EFAULT;
      if (get_user(info.stream, &_info->stream))
            return -EFAULT;
      if (get_user(info.subdevice, &_info->subdevice))
            return -EFAULT;
      if ((err = snd_rawmidi_info_select(card, &info)) < 0)
            return err;
      if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
            return -EFAULT;
      return 0;
}

int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
                        struct snd_rawmidi_params * params)
{
      char *newbuf;
      struct snd_rawmidi_runtime *runtime = substream->runtime;
      
      if (substream->append && substream->use_count > 1)
            return -EBUSY;
      snd_rawmidi_drain_output(substream);
      if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
            return -EINVAL;
      }
      if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
            return -EINVAL;
      }
      if (params->buffer_size != runtime->buffer_size) {
            newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
            if (!newbuf)
                  return -ENOMEM;
            kfree(runtime->buffer);
            runtime->buffer = newbuf;
            runtime->buffer_size = params->buffer_size;
            runtime->avail = runtime->buffer_size;
      }
      runtime->avail_min = params->avail_min;
      substream->active_sensing = !params->no_active_sensing;
      return 0;
}

int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
                       struct snd_rawmidi_params * params)
{
      char *newbuf;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      snd_rawmidi_drain_input(substream);
      if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
            return -EINVAL;
      }
      if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
            return -EINVAL;
      }
      if (params->buffer_size != runtime->buffer_size) {
            newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
            if (!newbuf)
                  return -ENOMEM;
            kfree(runtime->buffer);
            runtime->buffer = newbuf;
            runtime->buffer_size = params->buffer_size;
      }
      runtime->avail_min = params->avail_min;
      return 0;
}

static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
                             struct snd_rawmidi_status * status)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      memset(status, 0, sizeof(*status));
      status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
      spin_lock_irq(&runtime->lock);
      status->avail = runtime->avail;
      spin_unlock_irq(&runtime->lock);
      return 0;
}

static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
                            struct snd_rawmidi_status * status)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      memset(status, 0, sizeof(*status));
      status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
      spin_lock_irq(&runtime->lock);
      status->avail = runtime->avail;
      status->xruns = runtime->xruns;
      runtime->xruns = 0;
      spin_unlock_irq(&runtime->lock);
      return 0;
}

static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
      struct snd_rawmidi_file *rfile;
      void __user *argp = (void __user *)arg;

      rfile = file->private_data;
      if (((cmd >> 8) & 0xff) != 'W')
            return -ENOTTY;
      switch (cmd) {
      case SNDRV_RAWMIDI_IOCTL_PVERSION:
            return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
      case SNDRV_RAWMIDI_IOCTL_INFO:
      {
            int stream;
            struct snd_rawmidi_info __user *info = argp;
            if (get_user(stream, &info->stream))
                  return -EFAULT;
            switch (stream) {
            case SNDRV_RAWMIDI_STREAM_INPUT:
                  return snd_rawmidi_info_user(rfile->input, info);
            case SNDRV_RAWMIDI_STREAM_OUTPUT:
                  return snd_rawmidi_info_user(rfile->output, info);
            default:
                  return -EINVAL;
            }
      }
      case SNDRV_RAWMIDI_IOCTL_PARAMS:
      {
            struct snd_rawmidi_params params;
            if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
                  return -EFAULT;
            switch (params.stream) {
            case SNDRV_RAWMIDI_STREAM_OUTPUT:
                  if (rfile->output == NULL)
                        return -EINVAL;
                  return snd_rawmidi_output_params(rfile->output, &params);
            case SNDRV_RAWMIDI_STREAM_INPUT:
                  if (rfile->input == NULL)
                        return -EINVAL;
                  return snd_rawmidi_input_params(rfile->input, &params);
            default:
                  return -EINVAL;
            }
      }
      case SNDRV_RAWMIDI_IOCTL_STATUS:
      {
            int err = 0;
            struct snd_rawmidi_status status;
            if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
                  return -EFAULT;
            switch (status.stream) {
            case SNDRV_RAWMIDI_STREAM_OUTPUT:
                  if (rfile->output == NULL)
                        return -EINVAL;
                  err = snd_rawmidi_output_status(rfile->output, &status);
                  break;
            case SNDRV_RAWMIDI_STREAM_INPUT:
                  if (rfile->input == NULL)
                        return -EINVAL;
                  err = snd_rawmidi_input_status(rfile->input, &status);
                  break;
            default:
                  return -EINVAL;
            }
            if (err < 0)
                  return err;
            if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
                  return -EFAULT;
            return 0;
      }
      case SNDRV_RAWMIDI_IOCTL_DROP:
      {
            int val;
            if (get_user(val, (int __user *) argp))
                  return -EFAULT;
            switch (val) {
            case SNDRV_RAWMIDI_STREAM_OUTPUT:
                  if (rfile->output == NULL)
                        return -EINVAL;
                  return snd_rawmidi_drop_output(rfile->output);
            default:
                  return -EINVAL;
            }
      }
      case SNDRV_RAWMIDI_IOCTL_DRAIN:
      {
            int val;
            if (get_user(val, (int __user *) argp))
                  return -EFAULT;
            switch (val) {
            case SNDRV_RAWMIDI_STREAM_OUTPUT:
                  if (rfile->output == NULL)
                        return -EINVAL;
                  return snd_rawmidi_drain_output(rfile->output);
            case SNDRV_RAWMIDI_STREAM_INPUT:
                  if (rfile->input == NULL)
                        return -EINVAL;
                  return snd_rawmidi_drain_input(rfile->input);
            default:
                  return -EINVAL;
            }
      }
#ifdef CONFIG_SND_DEBUG
      default:
            snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
#endif
      }
      return -ENOTTY;
}

static int snd_rawmidi_control_ioctl(struct snd_card *card,
                             struct snd_ctl_file *control,
                             unsigned int cmd,
                             unsigned long arg)
{
      void __user *argp = (void __user *)arg;

      switch (cmd) {
      case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
      {
            int device;
            
            if (get_user(device, (int __user *)argp))
                  return -EFAULT;
            mutex_lock(&register_mutex);
            device = device < 0 ? 0 : device + 1;
            while (device < SNDRV_RAWMIDI_DEVICES) {
                  if (snd_rawmidi_search(card, device))
                        break;
                  device++;
            }
            if (device == SNDRV_RAWMIDI_DEVICES)
                  device = -1;
            mutex_unlock(&register_mutex);
            if (put_user(device, (int __user *)argp))
                  return -EFAULT;
            return 0;
      }
      case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
      {
            int val;
            
            if (get_user(val, (int __user *)argp))
                  return -EFAULT;
            control->prefer_rawmidi_subdevice = val;
            return 0;
      }
      case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
            return snd_rawmidi_info_select_user(card, argp);
      }
      return -ENOIOCTLCMD;
}

/**
 * snd_rawmidi_receive - receive the input data from the device
 * @substream: the rawmidi substream
 * @buffer: the buffer pointer
 * @count: the data size to read
 *
 * Reads the data from the internal buffer.
 *
 * Returns the size of read data, or a negative error code on failure.
 */
int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
                  const unsigned char *buffer, int count)
{
      unsigned long flags;
      int result = 0, count1;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      if (runtime->buffer == NULL) {
            snd_printd("snd_rawmidi_receive: input is not active!!!\n");
            return -EINVAL;
      }
      spin_lock_irqsave(&runtime->lock, flags);
      if (count == 1) { /* special case, faster code */
            substream->bytes++;
            if (runtime->avail < runtime->buffer_size) {
                  runtime->buffer[runtime->hw_ptr++] = buffer[0];
                  runtime->hw_ptr %= runtime->buffer_size;
                  runtime->avail++;
                  result++;
            } else {
                  runtime->xruns++;
            }
      } else {
            substream->bytes += count;
            count1 = runtime->buffer_size - runtime->hw_ptr;
            if (count1 > count)
                  count1 = count;
            if (count1 > (int)(runtime->buffer_size - runtime->avail))
                  count1 = runtime->buffer_size - runtime->avail;
            memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
            runtime->hw_ptr += count1;
            runtime->hw_ptr %= runtime->buffer_size;
            runtime->avail += count1;
            count -= count1;
            result += count1;
            if (count > 0) {
                  buffer += count1;
                  count1 = count;
                  if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
                        count1 = runtime->buffer_size - runtime->avail;
                        runtime->xruns += count - count1;
                  }
                  if (count1 > 0) {
                        memcpy(runtime->buffer, buffer, count1);
                        runtime->hw_ptr = count1;
                        runtime->avail += count1;
                        result += count1;
                  }
            }
      }
      if (result > 0) {
            if (runtime->event)
                  tasklet_hi_schedule(&runtime->tasklet);
            else if (snd_rawmidi_ready(substream))
                  wake_up(&runtime->sleep);
      }
      spin_unlock_irqrestore(&runtime->lock, flags);
      return result;
}

static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
                             unsigned char *buf, long count, int kernel)
{
      unsigned long flags;
      long result = 0, count1;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      while (count > 0 && runtime->avail) {
            count1 = runtime->buffer_size - runtime->appl_ptr;
            if (count1 > count)
                  count1 = count;
            spin_lock_irqsave(&runtime->lock, flags);
            if (count1 > (int)runtime->avail)
                  count1 = runtime->avail;
            if (kernel) {
                  memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
            } else {
                  spin_unlock_irqrestore(&runtime->lock, flags);
                  if (copy_to_user((char __user *)buf + result,
                               runtime->buffer + runtime->appl_ptr, count1)) {
                        return result > 0 ? result : -EFAULT;
                  }
                  spin_lock_irqsave(&runtime->lock, flags);
            }
            runtime->appl_ptr += count1;
            runtime->appl_ptr %= runtime->buffer_size;
            runtime->avail -= count1;
            spin_unlock_irqrestore(&runtime->lock, flags);
            result += count1;
            count -= count1;
      }
      return result;
}

long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
                       unsigned char *buf, long count)
{
      snd_rawmidi_input_trigger(substream, 1);
      return snd_rawmidi_kernel_read1(substream, buf, count, 1);
}

static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
                        loff_t *offset)
{
      long result;
      int count1;
      struct snd_rawmidi_file *rfile;
      struct snd_rawmidi_substream *substream;
      struct snd_rawmidi_runtime *runtime;

      rfile = file->private_data;
      substream = rfile->input;
      if (substream == NULL)
            return -EIO;
      runtime = substream->runtime;
      snd_rawmidi_input_trigger(substream, 1);
      result = 0;
      while (count > 0) {
            spin_lock_irq(&runtime->lock);
            while (!snd_rawmidi_ready(substream)) {
                  wait_queue_t wait;
                  if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
                        spin_unlock_irq(&runtime->lock);
                        return result > 0 ? result : -EAGAIN;
                  }
                  init_waitqueue_entry(&wait, current);
                  add_wait_queue(&runtime->sleep, &wait);
                  set_current_state(TASK_INTERRUPTIBLE);
                  spin_unlock_irq(&runtime->lock);
                  schedule();
                  remove_wait_queue(&runtime->sleep, &wait);
                  if (signal_pending(current))
                        return result > 0 ? result : -ERESTARTSYS;
                  if (!runtime->avail)
                        return result > 0 ? result : -EIO;
                  spin_lock_irq(&runtime->lock);
            }
            spin_unlock_irq(&runtime->lock);
            count1 = snd_rawmidi_kernel_read1(substream,
                                      (unsigned char __force *)buf,
                                      count, 0);
            if (count1 < 0)
                  return result > 0 ? result : count1;
            result += count1;
            buf += count1;
            count -= count1;
      }
      return result;
}

/**
 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
 * @substream: the rawmidi substream
 * 
 * Returns 1 if the internal output buffer is empty, 0 if not.
 */
int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
{
      struct snd_rawmidi_runtime *runtime = substream->runtime;
      int result;
      unsigned long flags;

      if (runtime->buffer == NULL) {
            snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
            return 1;
      }
      spin_lock_irqsave(&runtime->lock, flags);
      result = runtime->avail >= runtime->buffer_size;
      spin_unlock_irqrestore(&runtime->lock, flags);
      return result;          
}

/**
 * snd_rawmidi_transmit_peek - copy data from the internal buffer
 * @substream: the rawmidi substream
 * @buffer: the buffer pointer
 * @count: data size to transfer
 *
 * Copies data from the internal output buffer to the given buffer.
 *
 * Call this in the interrupt handler when the midi output is ready,
 * and call snd_rawmidi_transmit_ack() after the transmission is
 * finished.
 *
 * Returns the size of copied data, or a negative error code on failure.
 */
int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
                        unsigned char *buffer, int count)
{
      unsigned long flags;
      int result, count1;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      if (runtime->buffer == NULL) {
            snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
            return -EINVAL;
      }
      result = 0;
      spin_lock_irqsave(&runtime->lock, flags);
      if (runtime->avail >= runtime->buffer_size) {
            /* warning: lowlevel layer MUST trigger down the hardware */
            goto __skip;
      }
      if (count == 1) { /* special case, faster code */
            *buffer = runtime->buffer[runtime->hw_ptr];
            result++;
      } else {
            count1 = runtime->buffer_size - runtime->hw_ptr;
            if (count1 > count)
                  count1 = count;
            if (count1 > (int)(runtime->buffer_size - runtime->avail))
                  count1 = runtime->buffer_size - runtime->avail;
            memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
            count -= count1;
            result += count1;
            if (count > 0) {
                  if (count > (int)(runtime->buffer_size - runtime->avail - count1))
                        count = runtime->buffer_size - runtime->avail - count1;
                  memcpy(buffer + count1, runtime->buffer, count);
                  result += count;
            }
      }
      __skip:
      spin_unlock_irqrestore(&runtime->lock, flags);
      return result;
}

/**
 * snd_rawmidi_transmit_ack - acknowledge the transmission
 * @substream: the rawmidi substream
 * @count: the tranferred count
 *
 * Advances the hardware pointer for the internal output buffer with
 * the given size and updates the condition.
 * Call after the transmission is finished.
 *
 * Returns the advanced size if successful, or a negative error code on failure.
 */
int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
{
      unsigned long flags;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      if (runtime->buffer == NULL) {
            snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
            return -EINVAL;
      }
      spin_lock_irqsave(&runtime->lock, flags);
      snd_assert(runtime->avail + count <= runtime->buffer_size, );
      runtime->hw_ptr += count;
      runtime->hw_ptr %= runtime->buffer_size;
      runtime->avail += count;
      substream->bytes += count;
      if (count > 0) {
            if (runtime->drain || snd_rawmidi_ready(substream))
                  wake_up(&runtime->sleep);
      }
      spin_unlock_irqrestore(&runtime->lock, flags);
      return count;
}

/**
 * snd_rawmidi_transmit - copy from the buffer to the device
 * @substream: the rawmidi substream
 * @buffer: the buffer pointer
 * @count: the data size to transfer
 * 
 * Copies data from the buffer to the device and advances the pointer.
 *
 * Returns the copied size if successful, or a negative error code on failure.
 */
int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
                   unsigned char *buffer, int count)
{
      count = snd_rawmidi_transmit_peek(substream, buffer, count);
      if (count < 0)
            return count;
      return snd_rawmidi_transmit_ack(substream, count);
}

static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
                              const unsigned char *buf, long count, int kernel)
{
      unsigned long flags;
      long count1, result;
      struct snd_rawmidi_runtime *runtime = substream->runtime;

      snd_assert(buf != NULL, return -EINVAL);
      snd_assert(runtime->buffer != NULL, return -EINVAL);

      result = 0;
      spin_lock_irqsave(&runtime->lock, flags);
      if (substream->append) {
            if ((long)runtime->avail < count) {
                  spin_unlock_irqrestore(&runtime->lock, flags);
                  return -EAGAIN;
            }
      }
      while (count > 0 && runtime->avail > 0) {
            count1 = runtime->buffer_size - runtime->appl_ptr;
            if (count1 > count)
                  count1 = count;
            if (count1 > (long)runtime->avail)
                  count1 = runtime->avail;
            if (kernel) {
                  memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
            } else {
                  spin_unlock_irqrestore(&runtime->lock, flags);
                  if (copy_from_user(runtime->buffer + runtime->appl_ptr,
                                 (char __user *)buf, count1)) {
                        spin_lock_irqsave(&runtime->lock, flags);
                        result = result > 0 ? result : -EFAULT;
                        goto __end;
                  }
                  spin_lock_irqsave(&runtime->lock, flags);
            }
            runtime->appl_ptr += count1;
            runtime->appl_ptr %= runtime->buffer_size;
            runtime->avail -= count1;
            result += count1;
            buf += count1;
            count -= count1;
      }
      __end:
      count1 = runtime->avail < runtime->buffer_size;
      spin_unlock_irqrestore(&runtime->lock, flags);
      if (count1)
            snd_rawmidi_output_trigger(substream, 1);
      return result;
}

long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
                        const unsigned char *buf, long count)
{
      return snd_rawmidi_kernel_write1(substream, buf, count, 1);
}

static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
                         size_t count, loff_t *offset)
{
      long result, timeout;
      int count1;
      struct snd_rawmidi_file *rfile;
      struct snd_rawmidi_runtime *runtime;
      struct snd_rawmidi_substream *substream;

      rfile = file->private_data;
      substream = rfile->output;
      runtime = substream->runtime;
      /* we cannot put an atomic message to our buffer */
      if (substream->append && count > runtime->buffer_size)
            return -EIO;
      result = 0;
      while (count > 0) {
            spin_lock_irq(&runtime->lock);
            while (!snd_rawmidi_ready_append(substream, count)) {
                  wait_queue_t wait;
                  if (file->f_flags & O_NONBLOCK) {
                        spin_unlock_irq(&runtime->lock);
                        return result > 0 ? result : -EAGAIN;
                  }
                  init_waitqueue_entry(&wait, current);
                  add_wait_queue(&runtime->sleep, &wait);
                  set_current_state(TASK_INTERRUPTIBLE);
                  spin_unlock_irq(&runtime->lock);
                  timeout = schedule_timeout(30 * HZ);
                  remove_wait_queue(&runtime->sleep, &wait);
                  if (signal_pending(current))
                        return result > 0 ? result : -ERESTARTSYS;
                  if (!runtime->avail && !timeout)
                        return result > 0 ? result : -EIO;
                  spin_lock_irq(&runtime->lock);
            }
            spin_unlock_irq(&runtime->lock);
            count1 = snd_rawmidi_kernel_write1(substream,
                                       (unsigned char __force *)buf,
                                       count, 0);
            if (count1 < 0)
                  return result > 0 ? result : count1;
            result += count1;
            buf += count1;
            if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
                  break;
            count -= count1;
      }
      if (file->f_flags & O_SYNC) {
            spin_lock_irq(&runtime->lock);
            while (runtime->avail != runtime->buffer_size) {
                  wait_queue_t wait;
                  unsigned int last_avail = runtime->avail;
                  init_waitqueue_entry(&wait, current);
                  add_wait_queue(&runtime->sleep, &wait);
                  set_current_state(TASK_INTERRUPTIBLE);
                  spin_unlock_irq(&runtime->lock);
                  timeout = schedule_timeout(30 * HZ);
                  remove_wait_queue(&runtime->sleep, &wait);
                  if (signal_pending(current))
                        return result > 0 ? result : -ERESTARTSYS;
                  if (runtime->avail == last_avail && !timeout)
                        return result > 0 ? result : -EIO;
                  spin_lock_irq(&runtime->lock);
            }
            spin_unlock_irq(&runtime->lock);
      }
      return result;
}

static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
{
      struct snd_rawmidi_file *rfile;
      struct snd_rawmidi_runtime *runtime;
      unsigned int mask;

      rfile = file->private_data;
      if (rfile->input != NULL) {
            runtime = rfile->input->runtime;
            snd_rawmidi_input_trigger(rfile->input, 1);
            poll_wait(file, &runtime->sleep, wait);
      }
      if (rfile->output != NULL) {
            runtime = rfile->output->runtime;
            poll_wait(file, &runtime->sleep, wait);
      }
      mask = 0;
      if (rfile->input != NULL) {
            if (snd_rawmidi_ready(rfile->input))
                  mask |= POLLIN | POLLRDNORM;
      }
      if (rfile->output != NULL) {
            if (snd_rawmidi_ready(rfile->output))
                  mask |= POLLOUT | POLLWRNORM;
      }
      return mask;
}

/*
 */
#ifdef CONFIG_COMPAT
#include "rawmidi_compat.c"
#else
#define snd_rawmidi_ioctl_compat    NULL
#endif

/*

 */

static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
                               struct snd_info_buffer *buffer)
{
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_substream *substream;
      struct snd_rawmidi_runtime *runtime;
      struct list_head *list;

      rmidi = entry->private_data;
      snd_iprintf(buffer, "%s\n\n", rmidi->name);
      mutex_lock(&rmidi->open_mutex);
      if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
            list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
                  substream = list_entry(list, struct snd_rawmidi_substream, list);
                  snd_iprintf(buffer,
                            "Output %d\n"
                            "  Tx bytes     : %lu\n",
                            substream->number,
                            (unsigned long) substream->bytes);
                  if (substream->opened) {
                        runtime = substream->runtime;
                        snd_iprintf(buffer,
                            "  Mode         : %s\n"
                            "  Buffer size  : %lu\n"
                            "  Avail        : %lu\n",
                            runtime->oss ? "OSS compatible" : "native",
                            (unsigned long) runtime->buffer_size,
                            (unsigned long) runtime->avail);
                  }
            }
      }
      if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
            list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
                  substream = list_entry(list, struct snd_rawmidi_substream, list);
                  snd_iprintf(buffer,
                            "Input %d\n"
                            "  Rx bytes     : %lu\n",
                            substream->number,
                            (unsigned long) substream->bytes);
                  if (substream->opened) {
                        runtime = substream->runtime;
                        snd_iprintf(buffer,
                                  "  Buffer size  : %lu\n"
                                  "  Avail        : %lu\n"
                                  "  Overruns     : %lu\n",
                                  (unsigned long) runtime->buffer_size,
                                  (unsigned long) runtime->avail,
                                  (unsigned long) runtime->xruns);
                  }
            }
      }
      mutex_unlock(&rmidi->open_mutex);
}

/*
 *  Register functions
 */

static struct file_operations snd_rawmidi_f_ops =
{
      .owner =    THIS_MODULE,
      .read =           snd_rawmidi_read,
      .write =    snd_rawmidi_write,
      .open =           snd_rawmidi_open,
      .release =  snd_rawmidi_release,
      .poll =           snd_rawmidi_poll,
      .unlocked_ioctl = snd_rawmidi_ioctl,
      .compat_ioctl =   snd_rawmidi_ioctl_compat,
};

static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
                              struct snd_rawmidi_str *stream,
                              int direction,
                              int count)
{
      struct snd_rawmidi_substream *substream;
      int idx;

      INIT_LIST_HEAD(&stream->substreams);
      for (idx = 0; idx < count; idx++) {
            substream = kzalloc(sizeof(*substream), GFP_KERNEL);
            if (substream == NULL) {
                  snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
                  return -ENOMEM;
            }
            substream->stream = direction;
            substream->number = idx;
            substream->rmidi = rmidi;
            substream->pstr = stream;
            list_add_tail(&substream->list, &stream->substreams);
            stream->substream_count++;
      }
      return 0;
}

/**
 * snd_rawmidi_new - create a rawmidi instance
 * @card: the card instance
 * @id: the id string
 * @device: the device index
 * @output_count: the number of output streams
 * @input_count: the number of input streams
 * @rrawmidi: the pointer to store the new rawmidi instance
 *
 * Creates a new rawmidi instance.
 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_rawmidi_new(struct snd_card *card, char *id, int device,
                int output_count, int input_count,
                struct snd_rawmidi ** rrawmidi)
{
      struct snd_rawmidi *rmidi;
      int err;
      static struct snd_device_ops ops = {
            .dev_free = snd_rawmidi_dev_free,
            .dev_register = snd_rawmidi_dev_register,
            .dev_disconnect = snd_rawmidi_dev_disconnect,
      };

      snd_assert(rrawmidi != NULL, return -EINVAL);
      *rrawmidi = NULL;
      snd_assert(card != NULL, return -ENXIO);
      rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
      if (rmidi == NULL) {
            snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
            return -ENOMEM;
      }
      rmidi->card = card;
      rmidi->device = device;
      mutex_init(&rmidi->open_mutex);
      init_waitqueue_head(&rmidi->open_wait);
      if (id != NULL)
            strlcpy(rmidi->id, id, sizeof(rmidi->id));
      if ((err = snd_rawmidi_alloc_substreams(rmidi,
                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
                                    SNDRV_RAWMIDI_STREAM_INPUT,
                                    input_count)) < 0) {
            snd_rawmidi_free(rmidi);
            return err;
      }
      if ((err = snd_rawmidi_alloc_substreams(rmidi,
                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
                                    SNDRV_RAWMIDI_STREAM_OUTPUT,
                                    output_count)) < 0) {
            snd_rawmidi_free(rmidi);
            return err;
      }
      if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
            snd_rawmidi_free(rmidi);
            return err;
      }
      *rrawmidi = rmidi;
      return 0;
}

static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
{
      struct snd_rawmidi_substream *substream;

      while (!list_empty(&stream->substreams)) {
            substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
            list_del(&substream->list);
            kfree(substream);
      }
}

static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
{
      snd_assert(rmidi != NULL, return -ENXIO); 

      snd_info_free_entry(rmidi->proc_entry);
      rmidi->proc_entry = NULL;
      mutex_lock(&register_mutex);
      if (rmidi->ops && rmidi->ops->dev_unregister)
            rmidi->ops->dev_unregister(rmidi);
      mutex_unlock(&register_mutex);

      snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
      snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
      if (rmidi->private_free)
            rmidi->private_free(rmidi);
      kfree(rmidi);
      return 0;
}

static int snd_rawmidi_dev_free(struct snd_device *device)
{
      struct snd_rawmidi *rmidi = device->device_data;
      return snd_rawmidi_free(rmidi);
}

#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
{
      struct snd_rawmidi *rmidi = device->private_data;
      rmidi->seq_dev = NULL;
}
#endif

static int snd_rawmidi_dev_register(struct snd_device *device)
{
      int err;
      struct snd_info_entry *entry;
      char name[16];
      struct snd_rawmidi *rmidi = device->device_data;

      if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
            return -ENOMEM;
      mutex_lock(&register_mutex);
      if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
            mutex_unlock(&register_mutex);
            return -EBUSY;
      }
      list_add_tail(&rmidi->list, &snd_rawmidi_devices);
      sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
      if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
                               rmidi->card, rmidi->device,
                               &snd_rawmidi_f_ops, rmidi, name)) < 0) {
            snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
            list_del(&rmidi->list);
            mutex_unlock(&register_mutex);
            return err;
      }
      if (rmidi->ops && rmidi->ops->dev_register &&
          (err = rmidi->ops->dev_register(rmidi)) < 0) {
            snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
            list_del(&rmidi->list);
            mutex_unlock(&register_mutex);
            return err;
      }
#ifdef CONFIG_SND_OSSEMUL
      rmidi->ossreg = 0;
      if ((int)rmidi->device == midi_map[rmidi->card->number]) {
            if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
                                  rmidi->card, 0, &snd_rawmidi_f_ops,
                                  rmidi, name) < 0) {
                  snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
            } else {
                  rmidi->ossreg++;
#ifdef SNDRV_OSS_INFO_DEV_MIDI
                  snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
#endif
            }
      }
      if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
            if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
                                  rmidi->card, 1, &snd_rawmidi_f_ops,
                                  rmidi, name) < 0) {
                  snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
            } else {
                  rmidi->ossreg++;
            }
      }
#endif /* CONFIG_SND_OSSEMUL */
      mutex_unlock(&register_mutex);
      sprintf(name, "midi%d", rmidi->device);
      entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
      if (entry) {
            entry->private_data = rmidi;
            entry->c.text.read = snd_rawmidi_proc_info_read;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  entry = NULL;
            }
      }
      rmidi->proc_entry = entry;
#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
      if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
            if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
                  rmidi->seq_dev->private_data = rmidi;
                  rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
                  sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
                  snd_device_register(rmidi->card, rmidi->seq_dev);
            }
      }
#endif
      return 0;
}

static int snd_rawmidi_dev_disconnect(struct snd_device *device)
{
      struct snd_rawmidi *rmidi = device->device_data;

      mutex_lock(&register_mutex);
      list_del_init(&rmidi->list);
#ifdef CONFIG_SND_OSSEMUL
      if (rmidi->ossreg) {
            if ((int)rmidi->device == midi_map[rmidi->card->number]) {
                  snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
#ifdef SNDRV_OSS_INFO_DEV_MIDI
                  snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
#endif
            }
            if ((int)rmidi->device == amidi_map[rmidi->card->number])
                  snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
            rmidi->ossreg = 0;
      }
#endif /* CONFIG_SND_OSSEMUL */
      snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
      mutex_unlock(&register_mutex);
      return 0;
}

/**
 * snd_rawmidi_set_ops - set the rawmidi operators
 * @rmidi: the rawmidi instance
 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
 * @ops: the operator table
 *
 * Sets the rawmidi operators for the given stream direction.
 */
void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
                   struct snd_rawmidi_ops *ops)
{
      struct list_head *list;
      struct snd_rawmidi_substream *substream;
      
      list_for_each(list, &rmidi->streams[stream].substreams) {
            substream = list_entry(list, struct snd_rawmidi_substream, list);
            substream->ops = ops;
      }
}

/*
 *  ENTRY functions
 */

static int __init alsa_rawmidi_init(void)
{

      snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
      snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
#ifdef CONFIG_SND_OSSEMUL
      { int i;
      /* check device map table */
      for (i = 0; i < SNDRV_CARDS; i++) {
            if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
                  snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
                  midi_map[i] = 0;
            }
            if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
                  snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
                  amidi_map[i] = 1;
            }
      }
      }
#endif /* CONFIG_SND_OSSEMUL */
      return 0;
}

static void __exit alsa_rawmidi_exit(void)
{
      snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
      snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
}

module_init(alsa_rawmidi_init)
module_exit(alsa_rawmidi_exit)

EXPORT_SYMBOL(snd_rawmidi_output_params);
EXPORT_SYMBOL(snd_rawmidi_input_params);
EXPORT_SYMBOL(snd_rawmidi_drop_output);
EXPORT_SYMBOL(snd_rawmidi_drain_output);
EXPORT_SYMBOL(snd_rawmidi_drain_input);
EXPORT_SYMBOL(snd_rawmidi_receive);
EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
EXPORT_SYMBOL(snd_rawmidi_transmit);
EXPORT_SYMBOL(snd_rawmidi_new);
EXPORT_SYMBOL(snd_rawmidi_set_ops);
EXPORT_SYMBOL(snd_rawmidi_info_select);
EXPORT_SYMBOL(snd_rawmidi_kernel_open);
EXPORT_SYMBOL(snd_rawmidi_kernel_release);
EXPORT_SYMBOL(snd_rawmidi_kernel_read);
EXPORT_SYMBOL(snd_rawmidi_kernel_write);

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