fdt: Add support for decoding keyboard key tables

This adds a function for reading key tables from the fdt.

BUG=chromium-os:17034
TEST=boot U-Boot; type plain, shift and fn keys and check that the correct
output results

Change-Id: Ifb24f8bf143689ecb0f65c034a7d1b85a4d523ba
Reviewed-on: http://gerrit.chromium.org/gerrit/3333
Reviewed-by: Anton Staaf <robotboy@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/fdt_decode.h b/include/fdt_decode.h
index ce08cf34e33..c4b78d73ffc 100644
--- a/include/fdt_decode.h
+++ b/include/fdt_decode.h
@@ -53,6 +53,7 @@ enum fdt_compat_id {
 	COMPAT_SERIAL_NS16550,		/* NS16550 UART */
 	COMPAT_NVIDIA_TEGRA250_USB,	/* Tegra 250 USB port */
 	COMPAT_NVIDIA_TEGRA250_SDMMC,	/* Tegra 250 SDMMC port */
+	COMPAT_NVIDIA_TEGRA250_KBC,	/* Tegra 250 Keyboard */
 
 	COMPAT_COUNT,
 };
@@ -167,6 +168,17 @@ struct fdt_sdmmc {
 	enum periph_id periph_id; 		/* peripheral id */
 };
 
+enum {
+	FDT_KBC_KEY_COUNT	= 128,	/* number of keys in each map */
+};
+
+/* Information about keycode mappings */
+struct fdt_kbc {
+	u8 plain_keycode[FDT_KBC_KEY_COUNT];
+	u8 shift_keycode[FDT_KBC_KEY_COUNT];
+	u8 fn_keycode[FDT_KBC_KEY_COUNT];
+};
+
 /**
  * Return information from the FDT about the console UART. This looks for
  * an alias node called 'console' which must point to a UART. It then reads
@@ -359,3 +371,22 @@ int fdt_decode_sdmmc(const void *blob, int node, struct fdt_sdmmc *config);
  * @returns property string, NULL on error.
  */
 char *fdt_decode_get_config_string(const void *blob, const char *prop_name);
+
+/**
+ * Returns information from the FDT about the keboard controler. This function
+ * reads out the following attributes:
+ *
+ *	reg
+ *	keycode-plain
+ *	keycode-shift
+ *	keycode-fn
+ *
+ * @param blob		FDT blob to use
+ * @param node		Node to read from
+ * @param config	structure to use to return information
+ * @returns 0 on success, -ve on error, in which case config may or may not be
+ *			unchanged. If the node is present but expected data is
+ *			missing then this will generally return
+ *			-FDT_ERR_MISSING.
+ */
+int fdt_decode_kbc(const void *blob, int node, struct fdt_kbc *config);