From 4b396a05c455654b570c1c59ea44250be21b1075 Mon Sep 17 00:00:00 2001
From: Vic Yang <victoryang@chromium.org>
Date: Thu, 29 May 2014 14:15:38 -0700
Subject: [PATCH] Keyborg: options to turn on/off fast scan mode

For experiments, we sometimes need to turn off fast scan mode. Let's add
an option so that this can be easily done.

BUG=None
TEST=Manual test with fast scan mode on/off.
BRANCH=None

Change-Id: Icd9a4a4b18699f34f424e84167748fcfe30588e3
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/202141
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
---
 board/keyborg/board.h      |  1 +
 board/keyborg/touch_scan.c | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/board/keyborg/board.h b/board/keyborg/board.h
index d0dadffc2d..b1750575a6 100644
--- a/board/keyborg/board.h
+++ b/board/keyborg/board.h
@@ -13,6 +13,7 @@
 
 /* Optional features */
 #define CONFIG_DEBUG_PRINTF
+#define CONFIG_KEYBORG_FAST_SCAN
 #undef CONFIG_ADC
 #undef CONFIG_COMMON_GPIO
 #undef CONFIG_COMMON_PANIC_OUTPUT
diff --git a/board/keyborg/touch_scan.c b/board/keyborg/touch_scan.c
index b69ccfe33f..01642d2958 100644
--- a/board/keyborg/touch_scan.c
+++ b/board/keyborg/touch_scan.c
@@ -148,6 +148,7 @@ static inline void set_scan_needed(int col)
 		scan_needed[word + 1] |= SPAN_MASK >> (32 - bit);
 }
 
+#ifdef CONFIG_KEYBORG_FAST_SCAN
 int fast_scan(uint32_t *data)
 {
 	int col;
@@ -181,6 +182,17 @@ int fast_scan(uint32_t *data)
 
 	return EC_SUCCESS;
 }
+#else
+int fast_scan(uint32_t *data)
+{
+	int col;
+
+	for (col = 0; col < COL_COUNT * 2; ++col)
+		set_scan_needed(col);
+
+	return EC_SUCCESS;
+}
+#endif
 
 void scan_column(uint8_t *data)
 {