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