LXR linux/sound/drivers/opl4/opl4

   1/*
   2 * Functions for the OPL4 proc file
   3 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 */
  19
  20#include "opl4_local.h"
  21#include <linux/vmalloc.h>
  22#include <sound/info.h>
  23
  24#ifdef CONFIG_PROC_FS
  25
  26static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
  27                                  unsigned short mode, void **file_private_data)
  28{
  29        struct snd_opl4 *opl4 = entry->private_data;
  30
  31        mutex_lock(&opl4->access_mutex);
  32        if (opl4->memory_access) {
  33                mutex_unlock(&opl4->access_mutex);
  34                return -EBUSY;
  35        }
  36        opl4->memory_access++;
  37        mutex_unlock(&opl4->access_mutex);
  38        return 0;
  39}
  40
  41static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
  42                                     unsigned short mode, void *file_private_data)
  43{
  44        struct snd_opl4 *opl4 = entry->private_data;
  45
  46        mutex_lock(&opl4->access_mutex);
  47        opl4->memory_access--;
  48        mutex_unlock(&opl4->access_mutex);
  49        return 0;
  50}
  51
  52static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
  53                                      void *file_private_data,
  54                                      struct file *file, char __user *_buf,
  55                                      size_t count, loff_t pos)
  56{
  57        struct snd_opl4 *opl4 = entry->private_data;
  58        char* buf;
  59
  60        buf = vmalloc(count);
  61        if (!buf)
  62                return -ENOMEM;
  63        snd_opl4_read_memory(opl4, buf, pos, count);
  64        if (copy_to_user(_buf, buf, count)) {
  65                vfree(buf);
  66                return -EFAULT;
  67        }
  68        vfree(buf);
  69        return count;
  70}
  71
  72static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
  73                                       void *file_private_data,
  74                                       struct file *file,
  75                                       const char __user *_buf,
  76                                       size_t count, loff_t pos)
  77{
  78        struct snd_opl4 *opl4 = entry->private_data;
  79        char *buf;
  80
  81        buf = vmalloc(count);
  82        if (!buf)
  83                return -ENOMEM;
  84        if (copy_from_user(buf, _buf, count)) {
  85                vfree(buf);
  86                return -EFAULT;
  87        }
  88        snd_opl4_write_memory(opl4, buf, pos, count);
  89        vfree(buf);
  90        return count;
  91}
  92
  93static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
  94        .open = snd_opl4_mem_proc_open,
  95        .release = snd_opl4_mem_proc_release,
  96        .read = snd_opl4_mem_proc_read,
  97        .write = snd_opl4_mem_proc_write,
  98};
  99
 100int snd_opl4_create_proc(struct snd_opl4 *opl4)
 101{
 102        struct snd_info_entry *entry;
 103
 104        entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
 105        if (entry) {
 106                if (opl4->hardware < OPL3_HW_OPL4_ML) {
 107                        /* OPL4 can access 4 MB external ROM/SRAM */
 108                        entry->mode |= S_IWUSR;
 109                        entry->size = 4 * 1024 * 1024;
 110                } else {
 111                        /* OPL4-ML has 1 MB internal ROM */
 112                        entry->size = 1 * 1024 * 1024;
 113                }
 114                entry->content = SNDRV_INFO_CONTENT_DATA;
 115                entry->c.ops = &snd_opl4_mem_proc_ops;
 116                entry->module = THIS_MODULE;
 117                entry->private_data = opl4;
 118                if (snd_info_register(entry) < 0) {
 119                        snd_info_free_entry(entry);
 120                        entry = NULL;
 121                }
 122        }
 123        opl4->proc_entry = entry;
 124        return 0;
 125}
 126
 127void snd_opl4_free_proc(struct snd_opl4 *opl4)
 128{
 129        snd_info_free_entry(opl4->proc_entry);
 130}
 131
 132#endif /* CONFIG_PROC_FS */
 133