/*
* 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(struct snd_info_entry *entry,
unsigned short mode, void **file_private_data)
{
struct snd_opl4 *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(struct snd_info_entry *entry,
unsigned short mode, void *file_private_data)
{
struct snd_opl4 *opl4 = entry->private_data;
down(&opl4->access_mutex);
opl4->memory_access--;
up(&opl4->access_mutex);
return 0;
}
static long snd_opl4_mem_proc_read(struct snd_info_entry *entry, void *file_private_data,
struct file *file, char __user *_buf,
unsigned long count, unsigned long pos)
{
struct snd_opl4 *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(struct snd_info_entry *entry, void *file_private_data,
struct file *file, const char __user *_buf,
unsigned long count, unsigned long pos)
{
struct snd_opl4 *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(struct snd_info_entry *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(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)
{
if (opl4->proc_entry)
snd_info_unregister(opl4->proc_entry);
}
#endif /* CONFIG_PROC_FS */
