mtd: chips/map_rom.c: implement point and unpoint methods

This will allow for the removal of the get_unmapped_area method later.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Chris Brandt <chris.brandt@renesas.com>
[rw: fixed build]
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/chips/map_rom.c

@@ -22,6 +22,10 @@ static struct mtd_info *map_rom_probe(struct map_info *map);
 static int maprom_erase (struct mtd_info *mtd, struct erase_info *info);
 static unsigned long maprom_unmapped_area(struct mtd_info *, unsigned long,
 					  unsigned long, unsigned long);
+static int maprom_point (struct mtd_info *mtd, loff_t from, size_t len,
+			 size_t *retlen, void **virt, resource_size_t *phys);
+static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
+
 
 static struct mtd_chip_driver maprom_chipdrv = {
 	.probe	= map_rom_probe,
@@ -52,6 +56,8 @@ static struct mtd_info *map_rom_probe(struct map_info *map)
 	mtd->type = MTD_ROM;
 	mtd->size = map->size;
 	mtd->_get_unmapped_area = maprom_unmapped_area;
+	mtd->_point = maprom_point;
+	mtd->_unpoint = maprom_unpoint;
 	mtd->_read = maprom_read;
 	mtd->_write = maprom_write;
 	mtd->_sync = maprom_nop;
@@ -80,6 +86,25 @@ static unsigned long maprom_unmapped_area(struct mtd_info *mtd,
 	return (unsigned long) map->virt + offset;
 }
 
+static int maprom_point(struct mtd_info *mtd, loff_t from, size_t len,
+			size_t *retlen, void **virt, resource_size_t *phys)
+{
+	struct map_info *map = mtd->priv;
+
+	if (!map->virt)
+		return -EINVAL;
+	*virt = map->virt + from;
+	if (phys)
+		*phys = map->phys + from;
+	*retlen = len;
+	return 0;
+}
+
+static int maprom_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
+{
+	return 0;
+}
+
 static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 {
 	struct map_info *map = mtd->priv;