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/*
* 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 ssize_t snd_gf1_mem_proc_dump(struct snd_info_entry *entry,
void *file_private_data,
struct file *file, char __user *buf,
size_t count, loff_t 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 loff_t snd_gf1_mem_proc_llseek(struct snd_info_entry *entry,
void *private_file_data,
struct file *file,
loff_t 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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