// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  GUS's memory access via proc filesystem
 */

#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 const 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_obj(*priv);
                        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_obj(*priv);
                        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;
}