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gus_mem_proc.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  GUS's memory access via proc filesystem
 *
 *
 *   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 <linux/slab.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/info.h>

struct gus_proc_private {
      int rom;          /* data are in ROM */
      unsigned int address;
      unsigned int size;
      struct snd_gus_card * gus;
};

static long snd_gf1_mem_proc_dump(struct snd_info_entry *entry, void *file_private_data,
                            struct file *file, char __user *buf,
                            unsigned long count, unsigned long pos)
{
      long size;
      struct gus_proc_private *priv = entry->private_data;
      struct snd_gus_card *gus = priv->gus;
      int err;

      size = count;
      if (pos + size > priv->size)
            size = (long)priv->size - pos;
      if (size > 0) {
            if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0)
                  return err;
            return size;
      }
      return 0;
}                 

static long long snd_gf1_mem_proc_llseek(struct snd_info_entry *entry,
                              void *private_file_data,
                              struct file *file,
                              long long offset,
                              int orig)
{
      struct gus_proc_private *priv = entry->private_data;

      switch (orig) {
      case SEEK_SET:
            file->f_pos = offset;
            break;
      case SEEK_CUR:
            file->f_pos += offset;
            break;
      case SEEK_END: /* offset is negative */
            file->f_pos = priv->size + offset;
            break;
      default:
            return -EINVAL;
      }
      if (file->f_pos > priv->size)
            file->f_pos = priv->size;
      return file->f_pos;
}

static void snd_gf1_mem_proc_free(struct snd_info_entry *entry)
{
      struct gus_proc_private *priv = entry->private_data;
      kfree(priv);
}

static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
      .read = snd_gf1_mem_proc_dump,
      .llseek = snd_gf1_mem_proc_llseek,
};

int snd_gf1_mem_proc_init(struct snd_gus_card * gus)
{
      int idx;
      char name[16];
      struct gus_proc_private *priv;
      struct snd_info_entry *entry;

      for (idx = 0; idx < 4; idx++) {
            if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
                  priv = kzalloc(sizeof(*priv), GFP_KERNEL);
                  if (priv == NULL)
                        return -ENOMEM;
                  priv->gus = gus;
                  sprintf(name, "gus-ram-%i", idx);
                  if (! snd_card_proc_new(gus->card, name, &entry)) {
                        entry->content = SNDRV_INFO_CONTENT_DATA;
                        entry->private_data = priv;
                        entry->private_free = snd_gf1_mem_proc_free;
                        entry->c.ops = &snd_gf1_mem_proc_ops;
                        priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
                        priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
                  }
            }
      }
      for (idx = 0; idx < 4; idx++) {
            if (gus->gf1.rom_present & (1 << idx)) {
                  priv = kzalloc(sizeof(*priv), GFP_KERNEL);
                  if (priv == NULL)
                        return -ENOMEM;
                  priv->rom = 1;
                  priv->gus = gus;
                  sprintf(name, "gus-rom-%i", idx);
                  if (! snd_card_proc_new(gus->card, name, &entry)) {
                        entry->content = SNDRV_INFO_CONTENT_DATA;
                        entry->private_data = priv;
                        entry->private_free = snd_gf1_mem_proc_free;
                        entry->c.ops = &snd_gf1_mem_proc_ops;
                        priv->address = idx * 4096 * 1024;
                        priv->size = entry->size = gus->gf1.rom_memory;
                  }
            }
      }
      return 0;
}

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