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 long snd_opl4_mem_proc_read(struct snd_info_entry *entry, void *file_private_data,
  53                                   struct file *file, char __user *_buf,
  54                                   unsigned long count, unsigned long pos)
  55{
  56        struct snd_opl4 *opl4 = entry->private_data;
  57        long size;
  58        char* buf;
  59
  60        size = count;
  61        if (pos + size > entry->size)
  62                size = entry->size - pos;
  63        if (size > 0) {
  64                buf = vmalloc(size);
  65                if (!buf)
  66                        return -ENOMEM;
  67                snd_opl4_read_memory(opl4, buf, pos, size);
  68                if (copy_to_user(_buf, buf, size)) {
  69                        vfree(buf);
  70                        return -EFAULT;
  71                }
  72                vfree(buf);
  73                return size;
  74        }
  75        return 0;
  76}
  77
  78static long snd_opl4_mem_proc_write(struct snd_info_entry *entry, void *file_private_data,
  79                                    struct file *file, const char __user *_buf,
  80                                    unsigned long count, unsigned long pos)
  81{
  82        struct snd_opl4 *opl4 = entry->private_data;
  83        long size;
  84        char *buf;
  85
  86        size = count;
  87        if (pos + size > entry->size)
  88                size = entry->size - pos;
  89        if (size > 0) {
  90                buf = vmalloc(size);
  91                if (!buf)
  92                        return -ENOMEM;
  93                if (copy_from_user(buf, _buf, size)) {
  94                        vfree(buf);
  95                        return -EFAULT;
  96                }
  97                snd_opl4_write_memory(opl4, buf, pos, size);
  98                vfree(buf);
  99                return size;
 100        }
 101        return 0;
 102}
 103
 104static long long snd_opl4_mem_proc_llseek(struct snd_info_entry *entry, void *file_private_data,
 105                                          struct file *file, long long offset, int orig)
 106{
 107        switch (orig) {
 108        case SEEK_SET:
 109                file->f_pos = offset;
 110                break;
 111        case SEEK_CUR:
 112                file->f_pos += offset;
 113                break;
 114        case SEEK_END: /* offset is negative */
 115                file->f_pos = entry->size + offset;
 116                break;
 117        default:
 118                return -EINVAL;
 119        }
 120        if (file->f_pos > entry->size)
 121                file->f_pos = entry->size;
 122        return file->f_pos;
 123}
 124
 125static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
 126        .open = snd_opl4_mem_proc_open,
 127        .release = snd_opl4_mem_proc_release,
 128        .read = snd_opl4_mem_proc_read,
 129        .write = snd_opl4_mem_proc_write,
 130        .llseek = snd_opl4_mem_proc_llseek,
 131};
 132
 133int snd_opl4_create_proc(struct snd_opl4 *opl4)
 134{
 135        struct snd_info_entry *entry;
 136
 137        entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
 138        if (entry) {
 139                if (opl4->hardware < OPL3_HW_OPL4_ML) {
 140                        /* OPL4 can access 4 MB external ROM/SRAM */
 141                        entry->mode |= S_IWUSR;
 142                        entry->size = 4 * 1024 * 1024;
 143                } else {
 144                        /* OPL4-ML has 1 MB internal ROM */
 145                        entry->size = 1 * 1024 * 1024;
 146                }
 147                entry->content = SNDRV_INFO_CONTENT_DATA;
 148                entry->c.ops = &snd_opl4_mem_proc_ops;
 149                entry->module = THIS_MODULE;
 150                entry->private_data = opl4;
 151                if (snd_info_register(entry) < 0) {
 152                        snd_info_free_entry(entry);
 153                        entry = NULL;
 154                }
 155        }
 156        opl4->proc_entry = entry;
 157        return 0;
 158}
 159
 160void snd_opl4_free_proc(struct snd_opl4 *opl4)
 161{
 162        snd_info_free_entry(opl4->proc_entry);
 163}
 164
 165#endif /* CONFIG_PROC_FS */
 166