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opl4_proc.c

/*
 * Functions for the OPL4 proc file
 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
 *
 * 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 "opl4_local.h"
#include <linux/vmalloc.h>
#include <sound/info.h>

#ifdef CONFIG_PROC_FS

static int snd_opl4_mem_proc_open(snd_info_entry_t *entry,
                          unsigned short mode, void **file_private_data)
{
      opl4_t *opl4 = entry->private_data;

      down(&opl4->access_mutex);
      if (opl4->memory_access) {
            up(&opl4->access_mutex);
            return -EBUSY;
      }
      opl4->memory_access++;
      up(&opl4->access_mutex);
      return 0;
}

static int snd_opl4_mem_proc_release(snd_info_entry_t *entry,
                             unsigned short mode, void *file_private_data)
{
      opl4_t *opl4 = entry->private_data;

      down(&opl4->access_mutex);
      opl4->memory_access--;
      up(&opl4->access_mutex);
      return 0;
}

static long snd_opl4_mem_proc_read(snd_info_entry_t *entry, void *file_private_data,
                           struct file *file, char __user *_buf,
                           unsigned long count, unsigned long pos)
{
      opl4_t *opl4 = entry->private_data;
      long size;
      char* buf;

      size = count;
      if (pos + size > entry->size)
            size = entry->size - pos;
      if (size > 0) {
            buf = vmalloc(size);
            if (!buf)
                  return -ENOMEM;
            snd_opl4_read_memory(opl4, buf, pos, size);
            if (copy_to_user(_buf, buf, size)) {
                  vfree(buf);
                  return -EFAULT;
            }
            vfree(buf);
            return size;
      }
      return 0;
}

static long snd_opl4_mem_proc_write(snd_info_entry_t *entry, void *file_private_data,
                            struct file *file, const char __user *_buf,
                            unsigned long count, unsigned long pos)
{
      opl4_t *opl4 = entry->private_data;
      long size;
      char *buf;

      size = count;
      if (pos + size > entry->size)
            size = entry->size - pos;
      if (size > 0) {
            buf = vmalloc(size);
            if (!buf)
                  return -ENOMEM;
            if (copy_from_user(buf, _buf, size)) {
                  vfree(buf);
                  return -EFAULT;
            }
            snd_opl4_write_memory(opl4, buf, pos, size);
            vfree(buf);
            return size;
      }
      return 0;
}

static long long snd_opl4_mem_proc_llseek(snd_info_entry_t *entry, void *file_private_data,
                                struct file *file, long long offset, int orig)
{
      switch (orig) {
      case 0: /* SEEK_SET */
            file->f_pos = offset;
            break;
      case 1: /* SEEK_CUR */
            file->f_pos += offset;
            break;
      case 2: /* SEEK_END, offset is negative */
            file->f_pos = entry->size + offset;
            break;
      default:
            return -EINVAL;
      }
      if (file->f_pos > entry->size)
            file->f_pos = entry->size;
      return file->f_pos;
}

static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
      .open = snd_opl4_mem_proc_open,
      .release = snd_opl4_mem_proc_release,
      .read = snd_opl4_mem_proc_read,
      .write = snd_opl4_mem_proc_write,
      .llseek = snd_opl4_mem_proc_llseek,
};

int snd_opl4_create_proc(opl4_t *opl4)
{
      snd_info_entry_t *entry;

      entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
      if (entry) {
            if (opl4->hardware < OPL3_HW_OPL4_ML) {
                  /* OPL4 can access 4 MB external ROM/SRAM */
                  entry->mode |= S_IWUSR;
                  entry->size = 4 * 1024 * 1024;
            } else {
                  /* OPL4-ML has 1 MB internal ROM */
                  entry->size = 1 * 1024 * 1024;
            }
            entry->content = SNDRV_INFO_CONTENT_DATA;
            entry->c.ops = &snd_opl4_mem_proc_ops;
            entry->module = THIS_MODULE;
            entry->private_data = opl4;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  entry = NULL;
            }
      }
      opl4->proc_entry = entry;
      return 0;
}

void snd_opl4_free_proc(opl4_t *opl4)
{
      if (opl4->proc_entry)
            snd_info_unregister(opl4->proc_entry);
}

#endif /* CONFIG_PROC_FS */

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