kernel/sound/drivers/opl4/opl4_proc.c

   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
  25 #ifdef CONFIG_PROC_FS
  26
  27 static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
  28                                   unsigned short mode, void **file_private_data)
  29 {
  30         struct snd_opl4 *opl4 = entry->private_data;
  31
  32         mutex_lock(&opl4->access_mutex);
  33         if (opl4->memory_access) {
  34                 mutex_unlock(&opl4->access_mutex);
  35                 return -EBUSY;
  36         }
  37         opl4->memory_access++;
  38         mutex_unlock(&opl4->access_mutex);
  39         return 0;
  40 }
  41
  42 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
  43                                      unsigned short mode, void *file_private_data)
  44 {
  45         struct snd_opl4 *opl4 = entry->private_data;
  46
  47         mutex_lock(&opl4->access_mutex);
  48         opl4->memory_access--;
  49         mutex_unlock(&opl4->access_mutex);
  50         return 0;
  51 }
  52
  53 static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
  54                                       void *file_private_data,
  55                                       struct file *file, char __user *_buf,
  56                                       size_t count, loff_t pos)
  57 {
  58         struct snd_opl4 *opl4 = entry->private_data;
  59         char* buf;
  60
  61         buf = vmalloc(count);
  62         if (!buf)
  63                 return -ENOMEM;
  64         snd_opl4_read_memory(opl4, buf, pos, count);
  65         if (copy_to_user(_buf, buf, count)) {
  66                 vfree(buf);
  67                 return -EFAULT;
  68         }
  69         vfree(buf);
  70         return count;
  71 }
  72
  73 static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
  74                                        void *file_private_data,
  75                                        struct file *file,
  76                                        const char __user *_buf,
  77                                        size_t count, loff_t pos)
  78 {
  79         struct snd_opl4 *opl4 = entry->private_data;
  80         char *buf;
  81
  82         buf = vmalloc(count);
  83         if (!buf)
  84                 return -ENOMEM;
  85         if (copy_from_user(buf, _buf, count)) {
  86                 vfree(buf);
  87                 return -EFAULT;
  88         }
  89         snd_opl4_write_memory(opl4, buf, pos, count);
  90         vfree(buf);
  91         return count;
  92 }
  93
  94 static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
  95         .open = snd_opl4_mem_proc_open,
  96         .release = snd_opl4_mem_proc_release,
  97         .read = snd_opl4_mem_proc_read,
  98         .write = snd_opl4_mem_proc_write,
  99 };
 100
 101 int snd_opl4_create_proc(struct snd_opl4 *opl4)
 102 {
 103         struct snd_info_entry *entry;
 104
 105         entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
 106         if (entry) {
 107                 if (opl4->hardware < OPL3_HW_OPL4_ML) {
 108                         /* OPL4 can access 4 MB external ROM/SRAM */
 109                         entry->mode |= S_IWUSR;
 110                         entry->size = 4 * 1024 * 1024;
 111                 } else {
 112                         /* OPL4-ML has 1 MB internal ROM */
 113                         entry->size = 1 * 1024 * 1024;
 114                 }
 115                 entry->content = SNDRV_INFO_CONTENT_DATA;
 116                 entry->c.ops = &snd_opl4_mem_proc_ops;
 117                 entry->module = THIS_MODULE;
 118                 entry->private_data = opl4;
 119                 if (snd_info_register(entry) < 0) {
 120                         snd_info_free_entry(entry);
 121                         entry = NULL;
 122                 }
 123         }
 124         opl4->proc_entry = entry;
 125         return 0;
 126 }
 127
 128 void snd_opl4_free_proc(struct snd_opl4 *opl4)
 129 {
 130         snd_info_free_entry(opl4->proc_entry);
 131 }
 132
 133 #endif /* CONFIG_PROC_FS */