gus_mem_proc.c

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/*
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *  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)
{
    struct gus_proc_private *priv = entry->private_data;
    struct snd_gus_card *gus = priv->gus;
    int err;

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

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,
};

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;
}