sound/isa/gus/gus_mem_proc.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *  GUS's memory access via proc filesystem
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/slab.h>
  23 #include <sound/core.h>
  24 #include <sound/gus.h>
  25 #include <sound/info.h>
  26
  27 struct gus_proc_private {
  28         int rom;                /* data are in ROM */
  29         unsigned int address;
  30         unsigned int size;
  31         struct snd_gus_card * gus;
  32 };
  33
  34 static long snd_gf1_mem_proc_dump(struct snd_info_entry *entry, void *file_private_data,
  35                                   struct file *file, char __user *buf,
  36                                   unsigned long count, unsigned long pos)
  37 {
  38         long size;
  39         struct gus_proc_private *priv = entry->private_data;
  40         struct snd_gus_card *gus = priv->gus;
  41         int err;
  42
  43         size = count;
  44         if (pos + size > priv->size)
  45                 size = (long)priv->size - pos;
  46         if (size > 0) {
  47                 if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0)
  48                         return err;
  49                 return size;
  50         }
  51         return 0;
  52 }
  53
  54 static long long snd_gf1_mem_proc_llseek(struct snd_info_entry *entry,
  55                                         void *private_file_data,
  56                                         struct file *file,
  57                                         long long offset,
  58                                         int orig)
  59 {
  60         struct gus_proc_private *priv = entry->private_data;
  61
  62         switch (orig) {
  63         case SEEK_SET:
  64                 file->f_pos = offset;
  65                 break;
  66         case SEEK_CUR:
  67                 file->f_pos += offset;
  68                 break;
  69         case SEEK_END: /* offset is negative */
  70                 file->f_pos = priv->size + offset;
  71                 break;
  72         default:
  73                 return -EINVAL;
  74         }
  75         if (file->f_pos > priv->size)
  76                 file->f_pos = priv->size;
  77         return file->f_pos;
  78 }
  79
  80 static void snd_gf1_mem_proc_free(struct snd_info_entry *entry)
  81 {
  82         struct gus_proc_private *priv = entry->private_data;
  83         kfree(priv);
  84 }
  85
  86 static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
  87         .read = snd_gf1_mem_proc_dump,
  88         .llseek = snd_gf1_mem_proc_llseek,
  89 };
  90
  91 int snd_gf1_mem_proc_init(struct snd_gus_card * gus)
  92 {
  93         int idx;
  94         char name[16];
  95         struct gus_proc_private *priv;
  96         struct snd_info_entry *entry;
  97
  98         for (idx = 0; idx < 4; idx++) {
  99                 if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
 100                         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 101                         if (priv == NULL)
 102                                 return -ENOMEM;
 103                         priv->gus = gus;
 104                         sprintf(name, "gus-ram-%i", idx);
 105                         if (! snd_card_proc_new(gus->card, name, &entry)) {
 106                                 entry->content = SNDRV_INFO_CONTENT_DATA;
 107                                 entry->private_data = priv;
 108                                 entry->private_free = snd_gf1_mem_proc_free;
 109                                 entry->c.ops = &snd_gf1_mem_proc_ops;
 110                                 priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
 111                                 priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
 112                         }
 113                 }
 114         }
 115         for (idx = 0; idx < 4; idx++) {
 116                 if (gus->gf1.rom_present & (1 << idx)) {
 117                         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 118                         if (priv == NULL)
 119                                 return -ENOMEM;
 120                         priv->rom = 1;
 121                         priv->gus = gus;
 122                         sprintf(name, "gus-rom-%i", idx);
 123                         if (! snd_card_proc_new(gus->card, name, &entry)) {
 124                                 entry->content = SNDRV_INFO_CONTENT_DATA;
 125                                 entry->private_data = priv;
 126                                 entry->private_free = snd_gf1_mem_proc_free;
 127                                 entry->c.ops = &snd_gf1_mem_proc_ops;
 128                                 priv->address = idx * 4096 * 1024;
 129                                 priv->size = entry->size = gus->gf1.rom_memory;
 130                         }
 131                 }
 132         }
 133         return 0;
 134 }