opl4_proc.c

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/*
 * Functions for the OPL4 proc file
 * Copyright (c) 2003 by Clemens Ladisch <[email protected]>
 *
 * 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 */