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 static 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
  40 static 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
  51 static 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
  71 static 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
  92 static 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
  99 int 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
 126 void snd_opl4_free_proc(struct snd_opl4 *opl4)
 127 {
 128         snd_info_free_entry(opl4->proc_entry);
 129 }