/*
   * 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 <linux/export.h>

  #include <sound/info.h>
  
  #ifdef CONFIG_PROC_FS

  static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,

  				  unsigned short mode, void **file_private_data)
  {

  	struct snd_opl4 *opl4 = entry->private_data;

  	mutex_lock(&opl4->access_mutex);

  	if (opl4->memory_access) {

  		mutex_unlock(&opl4->access_mutex);

  		return -EBUSY;
  	}
  	opl4->memory_access++;

  	mutex_unlock(&opl4->access_mutex);

  	return 0;
  }

  static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,

  				     unsigned short mode, void *file_private_data)
  {

  	struct snd_opl4 *opl4 = entry->private_data;

  	mutex_lock(&opl4->access_mutex);

  	opl4->memory_access--;

  	mutex_unlock(&opl4->access_mutex);

  	return 0;
  }

  static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
  				      void *file_private_data,
  				      struct file *file, char __user *_buf,
  				      size_t count, loff_t pos)

  {

  	struct snd_opl4 *opl4 = entry->private_data;

  	char* buf;

  	buf = vmalloc(count);
  	if (!buf)
  		return -ENOMEM;
  	snd_opl4_read_memory(opl4, buf, pos, count);
  	if (copy_to_user(_buf, buf, count)) {

  		vfree(buf);

  		return -EFAULT;

  	}

  	vfree(buf);
  	return count;

  }

  static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
  				       void *file_private_data,
  				       struct file *file,
  				       const char __user *_buf,

  				       size_t count, loff_t pos)

  {

  	struct snd_opl4 *opl4 = entry->private_data;

  	char *buf;

  	buf = vmalloc(count);
  	if (!buf)
  		return -ENOMEM;
  	if (copy_from_user(buf, _buf, count)) {

  		vfree(buf);

  		return -EFAULT;

  	}

  	snd_opl4_write_memory(opl4, buf, pos, count);
  	vfree(buf);
  	return count;

  }

  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,

  };

  int snd_opl4_create_proc(struct snd_opl4 *opl4)

  {

  	struct snd_info_entry *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(struct snd_opl4 *opl4)

  {

  	snd_info_free_entry(opl4->proc_entry);

  }
  
  #endif /* CONFIG_PROC_FS */