i2c: add support for ww_ring

This is a copy of the depthcharge ww ring driver implementation ported
into coreboot. The main differences are:

 - direct use of the i2c driver instead of using the callback driver
   description

 - no dynamic memory allocation for the controller structures

BRANCH=storm
BUG=chrome-os-partner:36059
TEST=with the rest of the patches applied the LED ring gets
     initialized to the default pattern at coreboot start.

Change-Id: I6902c8b76fc173ad2ec28b8cc94695e892df338a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: eda24b78f8aff311dd6296d458bdfecf26c3d65a
Original-Change-Id: I5660dc3f255aab8fbe3a87041c72916a645c193b
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/257730
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9858
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/drivers/i2c/ww_ring/ww_ring.h b/src/drivers/i2c/ww_ring/ww_ring.h
new file mode 100644
index 0000000000..628cd6c504
--- /dev/null
+++ b/src/drivers/i2c/ww_ring/ww_ring.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SRC_DRIVERS_VIDEO_WW_RING__H__
+#define __SRC_DRIVERS_VIDEO_WW_RING__H__
+
+#if IS_ENABLED(CONFIG_CHROMEOS)
+#include <vboot_api.h>
+
+/*
+ * ww_ring_display_pattern
+ *
+ * Display pattern on the ring LEDs.
+ */
+int ww_ring_display_pattern(unsigned i2c_bus, enum VbScreenType_t screen_type);
+
+#else
+static inline int ww_ring_display_pattern(unsigned i2c_bus, int screen_type) { return 0;}
+#endif
+#endif