kernel/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 ssize_t snd_gf1_mem_proc_dump(struct snd_info_entry *entry,
  35                                      void *file_private_data,
  36                                      struct file *file, char __user *buf,
  37                                      size_t count, loff_t pos)
  38 {
  39         struct gus_proc_private *priv = entry->private_data;
  40         struct snd_gus_card *gus = priv->gus;
  41         int err;
  42
  43         err = snd_gus_dram_read(gus, buf, pos, count, priv->rom);
  44         if (err < 0)
  45                 return err;
  46         return count;
  47 }
  48
  49 static void snd_gf1_mem_proc_free(struct snd_info_entry *entry)
  50 {
  51         struct gus_proc_private *priv = entry->private_data;
  52         kfree(priv);
  53 }
  54
  55 static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
  56         .read = snd_gf1_mem_proc_dump,
  57 };
  58
  59 int snd_gf1_mem_proc_init(struct snd_gus_card * gus)
  60 {
  61         int idx;
  62         char name[16];
  63         struct gus_proc_private *priv;
  64         struct snd_info_entry *entry;
  65
  66         for (idx = 0; idx < 4; idx++) {
  67                 if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
  68                         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  69                         if (priv == NULL)
  70                                 return -ENOMEM;
  71                         priv->gus = gus;
  72                         sprintf(name, "gus-ram-%i", idx);
  73                         if (! snd_card_proc_new(gus->card, name, &entry)) {
  74                                 entry->content = SNDRV_INFO_CONTENT_DATA;
  75                                 entry->private_data = priv;
  76                                 entry->private_free = snd_gf1_mem_proc_free;
  77                                 entry->c.ops = &snd_gf1_mem_proc_ops;
  78                                 priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
  79                                 priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
  80                         }
  81                 }
  82         }
  83         for (idx = 0; idx < 4; idx++) {
  84                 if (gus->gf1.rom_present & (1 << idx)) {
  85                         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  86                         if (priv == NULL)
  87                                 return -ENOMEM;
  88                         priv->rom = 1;
  89                         priv->gus = gus;
  90                         sprintf(name, "gus-rom-%i", idx);
  91                         if (! snd_card_proc_new(gus->card, name, &entry)) {
  92                                 entry->content = SNDRV_INFO_CONTENT_DATA;
  93                                 entry->private_data = priv;
  94                                 entry->private_free = snd_gf1_mem_proc_free;
  95                                 entry->c.ops = &snd_gf1_mem_proc_ops;
  96                                 priv->address = idx * 4096 * 1024;
  97                                 priv->size = entry->size = gus->gf1.rom_memory;
  98                         }
  99                 }
 100         }
 101         return 0;
 102 }