LXR linux/sound/isa/gus/gus_mem

   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
  27struct 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
  34static 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
  49static 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
  55static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
  56        .read = snd_gf1_mem_proc_dump,
  57};
  58
  59int 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}
 103