drivers/mtd/map_rom.c

   1 /*
   2  * Common code to handle map devices which are simple ROM
   3  * (C) 2000 Red Hat. GPL'd.
   4  * $Id: map_rom.c,v 1.2 2000/07/03 10:01:38 dwmw2 Exp $
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <asm/io.h>
  11 #include <asm/byteorder.h>
  12 #include <linux/errno.h>
  13 #include <linux/malloc.h>
  14
  15 #include <linux/mtd/map.h>
  16
  17
  18 static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
  19 static void maprom_nop (struct mtd_info *);
  20
  21 struct mtd_info *map_rom_probe(struct map_info *);
  22 EXPORT_SYMBOL(map_rom_probe);
  23
  24 struct mtd_info *map_rom_probe(struct map_info *map)
  25 {
  26         struct mtd_info *mtd;
  27
  28         mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
  29         if (!mtd)
  30                 return NULL;
  31
  32         memset(mtd, 0, sizeof(*mtd));
  33
  34         map->fldrv_destroy = maprom_nop;
  35         mtd->priv = map;
  36         mtd->name = map->name;
  37         mtd->type = MTD_ROM;
  38         mtd->size = map->size;
  39         mtd->read = maprom_read;
  40         mtd->sync = maprom_nop;
  41         mtd->flags = MTD_CAP_ROM;
  42
  43         MOD_INC_USE_COUNT;
  44         return mtd;
  45 }
  46
  47
  48 static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
  49 {
  50         struct map_info *map = (struct map_info *)mtd->priv;
  51
  52         map->copy_from(map, buf, from, len);
  53         *retlen = len;
  54         return 0;
  55 }
  56
  57 static void maprom_nop(struct mtd_info *mtd)
  58 {
  59         /* Nothing to see here */
  60 }