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 <sound/info.h>
  23
  24 #ifdef CONFIG_PROC_FS
  25
  26 static 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
  41 static 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
  52 static 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
  78 static 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
 104 static 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
 125 static 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
 133 int 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
 160 void snd_opl4_free_proc(struct snd_opl4 *opl4)
 161 {
 162         snd_info_free_entry(opl4->proc_entry);
 163 }
 164
 165 #endif /* CONFIG_PROC_FS */