sound/isa/gus/gus_mem_proc.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  23 #include <linux/slab.h>
  24 #include <sound/core.h>
  25 #include <sound/gus.h>
  26 #include <sound/info.h>
  27
  28 typedef struct gus_proc_private {
  29         int rom;                /* data are in ROM */
  30         unsigned int address;
  31         unsigned int size;
  32         snd_gus_card_t * gus;
  33 } gus_proc_private_t;
  34
  35 static long snd_gf1_mem_proc_dump(snd_info_entry_t *entry, void *file_private_data,
  36                                   struct file *file, char __user *buf, long count)
  37 {
  38         long size;
  39         gus_proc_private_t *priv = snd_magic_cast(gus_proc_private_t, entry->private_data, return -ENXIO);
  40         snd_gus_card_t *gus = priv->gus;
  41         int err;
  42
  43         size = count;
  44         if (file->f_pos + size > priv->size)
  45                 size = (long)priv->size - file->f_pos;
  46         if (size > 0) {
  47                 if ((err = snd_gus_dram_read(gus, buf, file->f_pos, size, priv->rom)) < 0)
  48                         return err;
  49                 file->f_pos += size;
  50                 return size;
  51         }
  52         return 0;
  53 }
  54
  55 static long long snd_gf1_mem_proc_llseek(snd_info_entry_t *entry,
  56                                         void *private_file_data,
  57                                         struct file *file,
  58                                         long long offset,
  59                                         int orig)
  60 {
  61         gus_proc_private_t *priv = snd_magic_cast(gus_proc_private_t, entry->private_data, return -ENXIO);
  62
  63         switch (orig) {
  64         case 0: /* SEEK_SET */
  65                 file->f_pos = offset;
  66                 break;
  67         case 1: /* SEEK_CUR */
  68                 file->f_pos += offset;
  69                 break;
  70         case 2: /* SEEK_END, offset is negative */
  71                 file->f_pos = priv->size + offset;
  72                 break;
  73         default:
  74                 return -EINVAL;
  75         }
  76         if (file->f_pos > priv->size)
  77                 file->f_pos = priv->size;
  78         return file->f_pos;
  79 }
  80
  81 static void snd_gf1_mem_proc_free(snd_info_entry_t *entry)
  82 {
  83         gus_proc_private_t *priv = snd_magic_cast(gus_proc_private_t, entry->private_data, return);
  84         snd_magic_kfree(priv);
  85 }
  86
  87 static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
  88         .read = snd_gf1_mem_proc_dump,
  89         .llseek = snd_gf1_mem_proc_llseek,
  90 };
  91
  92 int snd_gf1_mem_proc_init(snd_gus_card_t * gus)
  93 {
  94         int idx;
  95         char name[16];
  96         gus_proc_private_t *priv;
  97         snd_info_entry_t *entry;
  98
  99         for (idx = 0; idx < 4; idx++) {
 100                 if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
 101                         priv = snd_magic_kcalloc(gus_proc_private_t, 0, GFP_KERNEL);
 102                         if (priv == NULL)
 103                                 return -ENOMEM;
 104                         priv->gus = gus;
 105                         sprintf(name, "gus-ram-%i", idx);
 106                         if (! snd_card_proc_new(gus->card, name, &entry)) {
 107                                 entry->content = SNDRV_INFO_CONTENT_DATA;
 108                                 entry->private_data = priv;
 109                                 entry->private_free = snd_gf1_mem_proc_free;
 110                                 entry->c.ops = &snd_gf1_mem_proc_ops;
 111                                 priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
 112                                 priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
 113                         }
 114                 }
 115         }
 116         for (idx = 0; idx < 4; idx++) {
 117                 if (gus->gf1.rom_present & (1 << idx)) {
 118                         priv = snd_magic_kcalloc(gus_proc_private_t, 0, GFP_KERNEL);
 119                         if (priv == NULL)
 120                                 return -ENOMEM;
 121                         priv->rom = 1;
 122                         priv->gus = gus;
 123                         sprintf(name, "gus-rom-%i", idx);
 124                         if (! snd_card_proc_new(gus->card, name, &entry)) {
 125                                 entry->content = SNDRV_INFO_CONTENT_DATA;
 126                                 entry->private_data = priv;
 127                                 entry->private_free = snd_gf1_mem_proc_free;
 128                                 entry->c.ops = &snd_gf1_mem_proc_ops;
 129                                 priv->address = idx * 4096 * 1024;
 130                                 priv->size = entry->size = gus->gf1.rom_memory;
 131                         }
 132                 }
 133         }
 134         return 0;
 135 }