root/sound/drivers/opl4/opl4_proc.c

DEFINITIONS

1. snd_opl4_mem_proc_open
2. snd_opl4_mem_proc_release
3. snd_opl4_mem_proc_read
4. snd_opl4_mem_proc_write
5. snd_opl4_mem_proc_llseek
6. snd_opl4_create_proc
7. snd_opl4_free_proc

/*
 * 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;

        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 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 SEEK_SET:
                file->f_pos = offset;
                break;
        case SEEK_CUR:
                file->f_pos += offset;
                break;
        case 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)
{
        snd_info_free_entry(opl4->proc_entry);
}

#endif /* CONFIG_PROC_FS */