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 <linux/export.h>
  23#include <sound/info.h>
  24
  25static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
  26                                  unsigned short mode, void **file_private_data)
  27{
  28        struct snd_opl4 *opl4 = entry->private_data;
  29
  30        mutex_lock(&opl4->access_mutex);
  31        if (opl4->memory_access) {
  32                mutex_unlock(&opl4->access_mutex);
  33                return -EBUSY;
  34        }
  35        opl4->memory_access++;
  36        mutex_unlock(&opl4->access_mutex);
  37        return 0;
  38}
  39
  40static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
  41                                     unsigned short mode, void *file_private_data)
  42{
  43        struct snd_opl4 *opl4 = entry->private_data;
  44
  45        mutex_lock(&opl4->access_mutex);
  46        opl4->memory_access--;
  47        mutex_unlock(&opl4->access_mutex);
  48        return 0;
  49}
  50
  51static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
  52                                      void *file_private_data,
  53                                      struct file *file, char __user *_buf,
  54                                      size_t count, loff_t pos)
  55{
  56        struct snd_opl4 *opl4 = entry->private_data;
  57        char* buf;
  58
  59        buf = vmalloc(count);
  60        if (!buf)
  61                return -ENOMEM;
  62        snd_opl4_read_memory(opl4, buf, pos, count);
  63        if (copy_to_user(_buf, buf, count)) {
  64                vfree(buf);
  65                return -EFAULT;
  66        }
  67        vfree(buf);
  68        return count;
  69}
  70
  71static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
  72                                       void *file_private_data,
  73                                       struct file *file,
  74                                       const char __user *_buf,
  75                                       size_t count, loff_t pos)
  76{
  77        struct snd_opl4 *opl4 = entry->private_data;
  78        char *buf;
  79
  80        buf = vmalloc(count);
  81        if (!buf)
  82                return -ENOMEM;
  83        if (copy_from_user(buf, _buf, count)) {
  84                vfree(buf);
  85                return -EFAULT;
  86        }
  87        snd_opl4_write_memory(opl4, buf, pos, count);
  88        vfree(buf);
  89        return count;
  90}
  91
  92static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
  93        .open = snd_opl4_mem_proc_open,
  94        .release = snd_opl4_mem_proc_release,
  95        .read = snd_opl4_mem_proc_read,
  96        .write = snd_opl4_mem_proc_write,
  97};
  98
  99int snd_opl4_create_proc(struct snd_opl4 *opl4)
 100{
 101        struct snd_info_entry *entry;
 102
 103        entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
 104        if (entry) {
 105                if (opl4->hardware < OPL3_HW_OPL4_ML) {
 106                        /* OPL4 can access 4 MB external ROM/SRAM */
 107                        entry->mode |= S_IWUSR;
 108                        entry->size = 4 * 1024 * 1024;
 109                } else {
 110                        /* OPL4-ML has 1 MB internal ROM */
 111                        entry->size = 1 * 1024 * 1024;
 112                }
 113                entry->content = SNDRV_INFO_CONTENT_DATA;
 114                entry->c.ops = &snd_opl4_mem_proc_ops;
 115                entry->module = THIS_MODULE;
 116                entry->private_data = opl4;
 117                if (snd_info_register(entry) < 0) {
 118                        snd_info_free_entry(entry);
 119                        entry = NULL;
 120                }
 121        }
 122        opl4->proc_entry = entry;
 123        return 0;
 124}
 125
 126void snd_opl4_free_proc(struct snd_opl4 *opl4)
 127{
 128        snd_info_free_entry(opl4->proc_entry);
 129}
 130