blk: Rewrite if_type to name functions

These are currently using a simple array lookup in one direction, and
relying on if_type being sequential.

With the move to uclass IDs this needs to change. Update the code to
prepare for the new way. This patch is intended to introduce no
functional change.

The returning of "(none)" from blk_get_if_type_name() is handling a case
that should not happen in either case.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
index 3738517..a68158c 100644 (file)
--- a/drivers/block/blk-uclass.c
+++ b/drivers/block/blk-uclass.c
@@ -17,18 +17,21 @@
 #include <dm/uclass-internal.h>
 #include <linux/err.h>
 
-static const char *if_typename_str[IF_TYPE_COUNT] = {
-       [IF_TYPE_IDE]           = "ide",
-       [IF_TYPE_SCSI]          = "scsi",
-       [IF_TYPE_USB]           = "usb",
-       [IF_TYPE_MMC]           = "mmc",
-       [IF_TYPE_SATA]          = "sata",
-       [IF_TYPE_HOST]          = "host",
-       [IF_TYPE_NVME]          = "nvme",
-       [IF_TYPE_EFI_MEDIA]     = "efi",
-       [IF_TYPE_EFI_LOADER]    = "efiloader",
-       [IF_TYPE_VIRTIO]        = "virtio",
-       [IF_TYPE_PVBLOCK]       = "pvblock",
+static struct {
+       enum uclass_id id;
+       const char *name;
+} if_typename_str[] = {
+       { IF_TYPE_IDE, "ide" },
+       { IF_TYPE_SCSI, "scsi" },
+       { IF_TYPE_USB, "usb" },
+       { IF_TYPE_MMC,  "mmc" },
+       { IF_TYPE_SCSI, "sata" },
+       { IF_TYPE_HOST, "host" },
+       { IF_TYPE_NVME, "nvme" },
+       { IF_TYPE_EFI_MEDIA, "efi" },
+       { IF_TYPE_EFI_LOADER, "efiloader" },
+       { IF_TYPE_VIRTIO, "virtio" },
+       { IF_TYPE_PVBLOCK, "pvblock" },
 };
 
 static enum uclass_id if_type_uclass_id[IF_TYPE_COUNT] = {
@@ -49,10 +52,9 @@ static enum if_type if_typename_to_iftype(const char *if_typename)
 {
        int i;
 
-       for (i = 0; i < IF_TYPE_COUNT; i++) {
-               if (if_typename_str[i] &&
-                   !strcmp(if_typename, if_typename_str[i]))
-                       return i;
+       for (i = 0; i < ARRAY_SIZE(if_typename_str); i++) {
+               if (!strcmp(if_typename, if_typename_str[i].name))
+                       return if_typename_str[i].id;
        }
 
        return IF_TYPE_UNKNOWN;
@@ -65,7 +67,14 @@ static enum uclass_id if_type_to_uclass_id(enum if_type if_type)
 
 const char *blk_get_if_type_name(enum if_type if_type)
 {
-       return if_typename_str[if_type];
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(if_typename_str); i++) {
+               if ((int)if_typename_str[i].id == if_type)
+                       return if_typename_str[i].name;
+       }
+
+       return "(none)";
 }
 
 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum)
@@ -104,7 +113,7 @@ struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum)
        uclass_id = if_type_to_uclass_id(type);
        if (uclass_id == UCLASS_INVALID) {
                debug("%s: Unknown uclass for interface type'\n",
-                     if_typename_str[type]);
+                     blk_get_if_type_name(type));
                return NULL;
        }