patch-2.4.6 linux/drivers/mtd/chips/map_rom.c

• Lines: 92
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/chips/map_rom.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/chips/map_rom.c linux/drivers/mtd/chips/map_rom.c
@@ -0,0 +1,91 @@
+/*
+ * Common code to handle map devices which are simple ROM
+ * (C) 2000 Red Hat. GPL'd.
+ * $Id: map_rom.c,v 1.14 2001/06/02 14:30:43 dwmw2 Exp $
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <linux/mtd/map.h>
+
+static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
+static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
+static void maprom_nop (struct mtd_info *);
+struct mtd_info *map_rom_probe(struct map_info *map);
+
+static struct mtd_chip_driver maprom_chipdrv = {
+	probe: map_rom_probe,
+	name: "rom",
+	module: THIS_MODULE
+};
+
+struct mtd_info *map_rom_probe(struct map_info *map)
+{
+	struct mtd_info *mtd;
+
+	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
+	if (!mtd)
+		return NULL;
+
+	memset(mtd, 0, sizeof(*mtd));
+
+	map->fldrv = &maprom_chipdrv;
+	mtd->priv = map;
+	mtd->name = map->name;
+	mtd->type = MTD_ROM;
+	mtd->size = map->size;
+	mtd->read = maprom_read;
+	mtd->write = maprom_write;
+	mtd->sync = maprom_nop;
+	mtd->flags = MTD_CAP_ROM;
+	mtd->erasesize = 131072;
+
+	MOD_INC_USE_COUNT;
+	return mtd;
+}
+
+
+static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+	struct map_info *map = (struct map_info *)mtd->priv;
+
+	map->copy_from(map, buf, from, len);
+	*retlen = len;
+	return 0;
+}
+
+static void maprom_nop(struct mtd_info *mtd)
+{
+	/* Nothing to see here */
+}
+
+static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
+{
+	printk(KERN_NOTICE "maprom_write called\n");
+	return -EIO;
+}
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define map_rom_init init_module
+#define map_rom_exit cleanup_module
+#endif
+
+mod_init_t map_rom_init(void)
+{
+	register_mtd_chip_driver(&maprom_chipdrv);
+	return 0;
+}
+
+mod_exit_t map_rom_exit(void)
+{
+	unregister_mtd_chip_driver(&maprom_chipdrv);
+}
+
+module_init(map_rom_init);
+module_exit(map_rom_exit);