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 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
  54static 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
  80static 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
  86static 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
  91int 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}
 135