Add ec_keyboard_test.c

This CL also includes 4 pieces:
  1. main files: environment-independent (main.c) and
                            -dependent (ec_keyboard_test.c).
  2. stub files: chip_stub/keyboard.c simulates the real hardware.
                 chip_stub/keyboard.h is the header of testing functions.
  3. initial keyboard lib code: ec_keyboard.h
  4. rename Cr* function name to Ec* under chip_interface/.

BUG=None
TEST=make && make runtests
Expect seeing the output debug message from cros_ec/lib/ec_keyboard.c.

Change-Id: Ia7e8022060eb0a5d0a11abcbdb3f524942f5c68d

17 files changed, 265 insertions, 70 deletions

diff --git a/chip_interface/ac_present.h b/chip_interface/ac_present.h
index c2bb0d9d77..02a152dc16 100644
--- a/chip_interface/ac_present.h
+++ b/chip_interface/ac_present.h
@@ -1,7 +1,10 @@
-/* power_button.h - Power button function.
- *                  Hides chip-specific implementation behind this interface.
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * power_button.h - Power button function.
+ *                  Hides chip-specific implementation behind this interface.
+ */
 
 #ifndef __CHIP_INTERFACE_AC_PRESENT_H
 #define __CHIP_INTERFACE_AC_PRESENT_H
@@ -10,18 +13,18 @@
  * Initialize the AC present as GPIO input pin and enable interrupt for
  * callback.
  */
-EcError CrAcPresentInit(void);
+EcError EcAcPresentInit(void);
 
 
 /* Calls GPIOPinRead() to read the GPIO state. */
 /* TODO: has the state been debounced? */
-EcError CrAcPrensentState(void);
+EcError EcAcPrensentState(void);
 
 
 /* Register a calback function. It is called while AC is plugged in or
  * unplugged.
  */
-EcError CrAcPresentRegister(void (*callback)(void));
+EcError EcAcPresentRegister(void (*callback)(void));
 
 /* Below is the example code to register this function. */
 #if 0
diff --git a/chip_interface/battery.h b/chip_interface/battery.h
index e5c3337a9c..5c2e0b49a1 100644
--- a/chip_interface/battery.h
+++ b/chip_interface/battery.h
@@ -1,7 +1,10 @@
-/* power_button.h - Power button function.
- *                  Hides chip-specific implementation behind this interface.
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * power_button.h - Power button function.
+ *                  Hides chip-specific implementation behind this interface.
+ */
 
 #ifndef __CHIP_INTERFACE_BATTERY_H
 #define __CHIP_INTERFACE_BATTERY_H
@@ -9,26 +12,26 @@
 
 /***********  Battery SMBus  *********************************************/
 /* Initialize the SMBus */
-EcError CrBatteryInit(void);
+EcError EcBatteryInit(void);
 
 /* Send a command to battery. Blocking */
-EcError CrBatterySendCommand(...);
+EcError EcBatterySendCommand(...);
 
 /* non-blocking read so that it can support both polling mode
  * and interrupt callback.
  */
-EcError CrBatteryRecvCommand(...);
+EcError EcBatteryRecvCommand(...);
 
 /* Register a callback when a packet comes from SMBus */
-EcError CrRegisterBatteryInterrupt(void (*isr)(...));
+EcError EcRegisterBatteryInterrupt(void (*isr)(...));
 
 #if 0  /* example code */
 void BatteryPacketArrive(...) {
-  CrBatteryRecvCommand();  // read the packet.
+  EcBatteryRecvCommand();  // read the packet.
 }
 
   ... somewhere in code ...
-  CrRegisterBatteryInterrupt(BatteryPacketArrive);
+  EcRegisterBatteryInterrupt(BatteryPacketArrive);
 
 #endif
 
@@ -38,22 +41,22 @@ void BatteryPacketArrive(...) {
  * Initialize the battery present as GPIO input pin and enable interrupt for
  * callback.
  */
-EcError CrBatteryPresentInit(void);
+EcError EcBatteryPresentInit(void);
 
 /* Calls GPIOPinRead() to read the GPIO state. */
 /* TODO: has the state been debounced? */
-EcError CrBatteryPrensentState(void);
+EcError EcBatteryPrensentState(void);
 
 /* Register a calback function. It is called while AC is plugged in or
  * unplugged.
  */
-EcError CrBatteryPresentRegister(void (*callback)(void));
+EcError EcBatteryPresentRegister(void (*callback)(void));
 
 /* Below is the example code to register this function. */
 #if 0
 /* This callback function is implemented in Chrome OS features layer. */
 void BatteryStateChanged(void) {
-  int battery_present = CrBatteryPresentState();
+  int battery_present = EcBatteryPresentState();
   if (battery_present) {
     // start to authenticate battery;
     // once authenticated, charge the battery;
@@ -62,7 +65,7 @@ void BatteryStateChanged(void) {
   }
 }
   ... somewhere in init code ...
-  CrBatteryPresentRegister(BatteryStateChanged);
+  EcBatteryPresentRegister(BatteryStateChanged);
 
 #endif /* #if 0 */
 
diff --git a/chip_interface/flash.h b/chip_interface/flash.h
index ec622a0863..b5e0a9b5a7 100644
--- a/chip_interface/flash.h
+++ b/chip_interface/flash.h
@@ -1,29 +1,32 @@
-/* flash.h - flash interface
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * flash.h - flash interface
+ */
 
 #ifndef __CHIP_INTERFACE_FLASH_H
 #define __CHIP_INTERFACE_FLASH_H
 
 /* returns the flash size and erase clock structure. */
-EcError CrFlashQuery(*size, *erase_block) {
+EcError EcFlashQuery(*size, *erase_block) {
 
-EcError CrFlashRead(addr_t offset, length, uint8_t *data);
+EcError EcFlashRead(addr_t offset, length, uint8_t *data);
 
-EcError CrFlashWrite(addr_t offset, length, uint8_t *data);
+EcError EcFlashWrite(addr_t offset, length, uint8_t *data);
 
-EcError CrFlashErase(addr_t offset, length);
+EcError EcFlashErase(addr_t offset, length);
 
-EcError CrFlashSetWriteProtectRange(addr_t offset, length);
+EcError EcFlashSetWriteProtectRange(addr_t offset, length);
 
 /* TODO: change to Randall's new model */
 /* Set lock bit (the SRP bit in SPI) */
-EcError CrFlashEnableWriteProtect(void);
+EcError EcFlashEnableWriteProtect(void);
 
 /* TODO: change to Randall's new model */
 /* Always return FAILED because FMPPEn cannot be reset to 1
  * until a power-on reset or after committed (see p. 577).
  */
-int CrFlashDisableWriteProtect(void);
+int EcFlashDisableWriteProtect(void);
 
 #endif  /* __CHIP_INTERFACE_FLASH_H */
diff --git a/chip_interface/keyboard_backlight.h b/chip_interface/keyboard_backlight.h
index cb3735de44..b51661a252 100644
--- a/chip_interface/keyboard_backlight.h
+++ b/chip_interface/keyboard_backlight.h
@@ -1,6 +1,9 @@
-/* keyboard_backlight.h - Keyboard backlight
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * keyboard_backlight.h - Keyboard backlight
+ */
 
 #ifndef __CHIP_INTERFACE_KEYBOARD_BACKLIGHT_H
 #define __CHIP_INTERFACE_KEYBOARD_BACKLIGHT_H
@@ -14,9 +17,9 @@
  */
 
 /* Configure PWM port and set the initial backlight value. */
-EcError CrKeyboardBacklightInit(uint16_t init_lightness);
+EcError EcKeyboardBacklightInit(uint16_t init_lightness);
 
 /* Set the mapped PWM value */
-EcError CrKeyboardBacklightSet(uint16_t lightness);
+EcError EcKeyboardBacklightSet(uint16_t lightness);
 
 #endif  /* __CHIP_INTERFACE_KEYBOARD_BACKLIGHT_H */
diff --git a/chip_interface/lid.h b/chip_interface/lid.h
index cffa35c4f4..8c680428f8 100644
--- a/chip_interface/lid.h
+++ b/chip_interface/lid.h
@@ -1,26 +1,29 @@
-/* lid.h - handle lid open/close
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * lid.h - handle lid open/close
+ */
 
 #ifndef __CHIP_INTERFACE_LID_H
 #define __CHIP_INTERFACE_LID_H
 
 /* Initialize the GPIO pin */
-EcError CrLidSwitchInit(void);
+EcError EcLidSwitchInit(void);
 
 /* Calls GPIOPinRead() to read the GPIO state. */
 /* TODO: has the state been debounced? */
-EcError CrLidSwitchState(void);
+EcError EcLidSwitchState(void);
 
 /* Register a calback function. It is called while lid state is changed.
  */
-EcError CrLidSwitchRegister(void (*callback)(void));
+EcError EcLidSwitchRegister(void (*callback)(void));
 
 /* Below is the example code to register this function. */
 #if 0
 /* This callback function is implemented in Chrome OS features layer. */
 void LidSwitchChanged(void) {
-  int lid_open = CrLidSwitchState();
+  int lid_open = EcLidSwitchState();
   if (lid_open) {
     if (system is in S3) {
       // resume system
@@ -32,7 +35,7 @@ void LidSwitchChanged(void) {
   }
 }
   ... somewhere in init code ...
-  CrLidSwitchRegister(LidSwitchChanged);
+  EcLidSwitchRegister(LidSwitchChanged);
 #endif
 
 #endif  /* __CHIP_INTERFACE_LID_H */
diff --git a/chip_interface/power_button.h b/chip_interface/power_button.h
index bc6d43e2d1..6b7293065e 100644
--- a/chip_interface/power_button.h
+++ b/chip_interface/power_button.h
@@ -1,7 +1,10 @@
-/* power_button.h - Power button function.
- *                  Hides chip-specific implementation behind this interface.
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * power_button.h - Power button function.
+ *                  Hides chip-specific implementation behind this interface.
+ */
 
 #ifndef __CHIP_INTERFACE_POWER_BUTTON_H
 #define __CHIP_INTERFACE_POWER_BUTTON_H
@@ -10,24 +13,24 @@
  * Initialize the power button as GPIO input pin and enable interrupt for
  *   keyboard scanner code.
  */
-EcError CrPowerButtonInit(void);
+EcError EcPowerButtonInit(void);
 
 
 /* Calls GPIOPinRead() to read the GPIO state. */
 /* TODO: has the state been debounced? */
-EcError CrPowerButtonGetState(void);
+EcError EcPowerButtonGetState(void);
 
 
 /* Register a calback function. It is called while power button is changing its
  * state (pressed or released ).
  */
-EcError CrPowerButtonRegister(void (*callback)(void));
+EcError EcPowerButtonRegister(void (*callback)(void));
 
 /* Below is the example code to register this function. */
 #if 0
 /* This callback function is implemented in Chrome OS features layer. */
 void PowerButtonCallback(void) {
-  int pressed = CrPowerButtonGetState();
+  int pressed = EcPowerButtonGetState();
   if (!prev_status) {
     if (pressed) {
       // Power button is just pressed. Generate scan code,
@@ -42,7 +45,7 @@ void PowerButtonCallback(void) {
 }
 
   ... somewhere in init code ...
-  CrPowerButtonRegister(PowerButtonCallback);
+  EcPowerButtonRegister(PowerButtonCallback);
 
 #endif /* #if 0 */
 
diff --git a/chip_interface/timer.h b/chip_interface/timer.h
index fa290abef5..b064939296 100644
--- a/chip_interface/timer.h
+++ b/chip_interface/timer.h
@@ -1,14 +1,17 @@
-/* timer.h - periodical timer
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
  *
- * (Chromium license) */
+ * timer.h - periodical timer
+ */
 
 #ifndef __CHIP_INTERFACE_TIMER_H
 #define __CHIP_INTERFACE_TIMER_H
 
 /* init hardware and prepare ISR */
-EcError CrPeriodicalTimerInit(void);
+EcError EcPeriodicalTimerInit(void);
 
-EcError CrPeriodicalTimerRegister(
+EcError EcPeriodicalTimerRegister(
     int interval  /* ms */,
     int (*timer)(int /* delta ms from last call */));
 
diff --git a/cros_ec/Makefile b/cros_ec/Makefile
index 33433fd1f1..ac2ac5b264 100644
--- a/cros_ec/Makefile
+++ b/cros_ec/Makefile
@@ -9,7 +9,8 @@ TESTDIR = $(CROS_EC_TOP)/test
 BUILD_ROOT := ${BUILD}/$(shell basename ${CROS_EC_TOP})
 LIBS = $(CROS_EC_LIB)  # Firmware library must be self-contained
 
-INCLUDES += -I$(LIBDIR)/include
+INCLUDES += -I$(LIBDIR)/include \
+		-I$(TOP)
 
 ifeq ($(FIRMWARE_ARCH),)
 INCLUDES += -I$(STUBDIR)/include
@@ -17,20 +18,28 @@ else
 INCLUDES += -I$(FWDIR)/arch/$(FIRMWARE_ARCH)/include
 endif
 
+CORE_SRCS = \
+	main.c
+
 # find ./lib -iname '*.c' | sort
+
+CORE_OBJS = $(CORE_SRCS:%.c=${BUILD_ROOT}/%.o)
+
 LIB_SRCS = \
 	./lib/ec_console.c \
-	./lib/ec_host_command.c
+	./lib/ec_host_command.c \
+	./lib/ec_keyboard.c
 
 LIB_OBJS = $(LIB_SRCS:%.c=${BUILD_ROOT}/%.o)
 
 STUB_SRCS = \
 	./chip_stub/ec_os.c \
-	./chip_stub/ec_uart.c
+	./chip_stub/ec_uart.c \
+	./chip_stub/keyboard.c
 
 STUB_OBJS = $(STUB_SRCS:%.c=${BUILD_ROOT}/%.o)
 
-ALL_SRCS = ${LIB_SRCS} ${STUB_SRCS}
+ALL_SRCS = ${CORE_SRCS} ${LIB_SRCS} ${STUB_SRCS}
 
 ifeq ($(FIRMWARE_ARCH),)
 all : $(CROS_EC_LIB) $(CHIP_STUB_LIB)
@@ -40,7 +49,7 @@ endif
 
 include ../common.mk
 
-$(CROS_EC_LIB) : $(LIB_OBJS)
+$(CROS_EC_LIB) : $(CORE_OBJS) $(LIB_OBJS)
 	rm -f $@
 	ar qc $@ $^
 
diff --git a/cros_ec/chip_stub/keyboard.c b/cros_ec/chip_stub/keyboard.c
new file mode 100644
index 0000000000..547df3614f
--- /dev/null
+++ b/cros_ec/chip_stub/keyboard.c
@@ -0,0 +1,50 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Chip stub code of keyboard. Implements the chip interface.
+ */
+
+#include <stdint.h>
+#include "chip_interface/keyboard.h"
+
+static EcKeyboardCallback core_keyboard_callback;
+static uint8_t virtual_matrix[MAX_KEYBOARD_MATRIX_COLS];
+
+EcError EcKeyboardRegisterCallback(EcKeyboardCallback cb) {
+  core_keyboard_callback = cb;
+  return EC_SUCCESS;
+}
+
+
+EcError EcKeyboardGetState(uint8_t *bit_array) {
+  /* TODO: implement later */
+  return EC_SUCCESS;
+}
+
+
+/* Called by test code. This simulates a key press or release.
+ * Usually, the test code would expect a scan code is received at host side.
+ */
+EcError SimulateKeyStateChange(int col, int row, int state) {
+  ASSERT(col < MAX_KEYBOARD_MATRIX_COLS);
+  ASSERT(row < MAX_KEYBOARD_MATRIX_ROWS);
+
+  if (!core_keyboard_callback) return EC_ERROR_UNKNOWN;
+
+  state = (state) ? 1 : 0;
+  int current_state = (virtual_matrix[col] >> row) & 1;
+
+  if (state && !current_state) {
+    /* key is just pressed down */
+    virtual_matrix[col] |= 1 << row;
+    core_keyboard_callback(col, row, state);
+  } else if (!state && current_state) {
+    virtual_matrix[col] &= ~(1 << row);
+    core_keyboard_callback(col, row, state);
+  } else {
+    /* Nothing happens if a key has been pressed or released. */
+  }
+
+  return EC_SUCCESS;
+}
diff --git a/cros_ec/chip_stub/keyboard.h b/cros_ec/chip_stub/keyboard.h
new file mode 100644
index 0000000000..a3357eec4f
--- /dev/null
+++ b/cros_ec/chip_stub/keyboard.h
@@ -0,0 +1,14 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * The keyboard stub header file for test code to include.
+ */
+
+
+#ifndef __EC_CHIP_STUB_KEYBOARD_H_
+#define __EC_CHIP_STUB_KEYBOARD_H_
+
+EcError SimulateKeyStateChange(int col, int row, int state);
+
+#endif  /* __EC_CHIP_STUB_KEYBOARD_H_ */
diff --git a/cros_ec/test/fakemain.c b/cros_ec/include/core.h
index 40316d08eb..2d88b4f77f 100644
--- a/cros_ec/test/fakemain.c
+++ b/cros_ec/include/core.h
@@ -1,16 +1,14 @@
 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
+ *
  */
+#ifndef __CROS_EC_INCLUDE_CORE_H
+#define __CROS_EC_INCLUDE_CORE_H
 
-/* Fake main routine, to make sure lib functions link */
+#include "ec_common.h"
 
-#include "ec_console.h"
-#include "ec_uart.h"
+/*  main.c  */
+EcError CoreMain();
 
-int main(void) {
-
-
-
-  return 0;
-}
+#endif  /* __CROS_EC_INCLUDE_CORE_H */
diff --git a/cros_ec/include/ec_common.h b/cros_ec/include/ec_common.h
index d5adb4e280..1a40958509 100644
--- a/cros_ec/include/ec_common.h
+++ b/cros_ec/include/ec_common.h
@@ -9,6 +9,7 @@
 #define __CROS_EC_COMMON_H
 
 #include <stdint.h>
+#include <stdio.h>  /* FIXME: will be removed for portibility in the future */
 
 /* Functions which return error return one of these.  This is an
  * integer instead of an enum to support module-internal error
@@ -33,4 +34,16 @@ enum EcErrorList {
   EC_ERROR_INTERNAL_LAST =  0x1FFFF
 };
 
+
+/* TODO: move to a proper .h file */
+#define PRINTF(fmt, ...) printf(fmt, __VA_ARGS__)
+
+/* TODO: move to a proper .h file */
+#define ASSERT(expr) do { \
+      if (!(expr)) {  \
+        PRINTF("ASSERT(%s) failed at file %s:%d.\n", \
+               #expr, __FILE__, __LINE__);  \
+      }  \
+    } while (0)
+
 #endif  /* __CROS_EC_COMMON_H */
diff --git a/cros_ec/include/ec_keyboard.h b/cros_ec/include/ec_keyboard.h
index c1c5d5e250..4f00209953 100644
--- a/cros_ec/include/ec_keyboard.h
+++ b/cros_ec/include/ec_keyboard.h
@@ -8,13 +8,19 @@
 #ifndef __CROS_EC_KEYBOARD_H
 #define __CROS_EC_KEYBOARD_H
 
+
+/* The initialize code of keyboard lib. Called by core main. */
+EcError EcKeyboardInit();
+
+
 /* Register the board-specific keyboard matrix translation function.
  * The callback function accepts col/row and returns the scan code.
  */
-EcError CrKeyboardMatrixRegister(
+EcError EcKeyboardMatrixRegister(
     int8_t col_num, int8_t row_num,
     EcError (*callback)(
         int8_t column, int8_t row, int8_t pressed,
         uint8_t *scan_code, int32_t* len));
 
+
 #endif  /* __CROS_EC_KEYBOARD_H */
diff --git a/cros_ec/lib/ec_keyboard.c b/cros_ec/lib/ec_keyboard.c
new file mode 100644
index 0000000000..f126f9eed8
--- /dev/null
+++ b/cros_ec/lib/ec_keyboard.c
@@ -0,0 +1,24 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Chrome OS EC keyboard code.
+ */
+
+#include "cros_ec/include/ec_common.h"
+#include "chip_interface/keyboard.h"
+
+static void KeyboardStateChanged(int col, int row, int is_pressed) {
+  PRINTF("File %s:%s(): col=%d row=%d is_pressed=%d\n",
+      __FILE__, __FUNCTION__, col, row, is_pressed);
+}
+
+
+EcError EcKeyboardInit() {
+  EcError ret;
+
+  ret = EcKeyboardRegisterCallback(KeyboardStateChanged);
+  if (ret != EC_SUCCESS) return ret;
+
+  return EC_SUCCESS;
+}
diff --git a/cros_ec/main.c b/cros_ec/main.c
index e69de29bb2..1a4dd78787 100644
--- a/cros_ec/main.c
+++ b/cros_ec/main.c
@@ -0,0 +1,24 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * This is the main function of Chrome OS EC core.
+ * Called by platform-dependent main function.
+ *
+ */
+#include "cros_ec/include/core.h"
+#include "cros_ec/include/ec_common.h"
+#include "cros_ec/include/ec_keyboard.h"
+
+
+EcError CoreMain() {
+  EcError ret;
+
+  ret = EcKeyboardInit();
+  if (ret != EC_SUCCESS) {
+    printf("EcKeyboardInit() failed: %d\n", ret);
+    return ret;
+  }
+
+  return EC_SUCCESS;
+}
diff --git a/cros_ec/test/Makefile b/cros_ec/test/Makefile
index 035a3f825c..84c766495d 100644
--- a/cros_ec/test/Makefile
+++ b/cros_ec/test/Makefile
@@ -3,10 +3,11 @@
 # found in the LICENSE file.
 
 INCLUDES += -I./include \
-		-I$(CROS_EC_DIR)/lib/include
+		-I$(CROS_EC_DIR)/lib/include \
+		-I../../
 BUILD_ROOT = ${BUILD}/cros_ec/test
 
-TEST_NAMES = ec_os_test
+TEST_NAMES = ec_os_test ec_keyboard_test
 
 TEST_BINS = $(addprefix ${BUILD_ROOT}/,$(TEST_NAMES))
 
@@ -21,6 +22,9 @@ CFLAGS +=  -MMD -MF $@.d -Xlinker --allow-multiple-definition
 
 LIBS := ${TEST_LIB} $(CROS_EC_LIB) $(CHIP_STUB_LIB)
 
+.SUFFIXES:
+.SUFFIXES: .o .c
+
 ifneq (${RUNTESTS},)
 EXTRA_TARGET = runtests
 endif
@@ -37,9 +41,10 @@ ${BUILD_ROOT}/%.o : %.c
 ${BUILD_ROOT}/% : %.c ${LIBS}
 	$(CC) $(CFLAGS) $(INCLUDES) $< ${LIBS} -o $@ -lrt
 
-ALLTESTS = ec_os_test
+ALLTESTS = ec_os_test ec_keyboard_test
 
 runtests:
 	${BUILD_ROOT}/ec_os_test
+	${BUILD_ROOT}/ec_keyboard_test
 
 -include ${ALL_DEPS}
diff --git a/cros_ec/test/ec_keyboard_test.c b/cros_ec/test/ec_keyboard_test.c
new file mode 100644
index 0000000000..bcdb83cc6d
--- /dev/null
+++ b/cros_ec/test/ec_keyboard_test.c
@@ -0,0 +1,31 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Testing code. Running at Linux environment.
+ */
+#include "cros_ec/include/ec_common.h"
+#include "cros_ec/include/core.h"
+#include "cros_ec/chip_stub/keyboard.h"
+
+
+int run_test_cases() {
+  /* Just a simple test */
+  SimulateKeyStateChange(2, 3, 1);
+  /* Expect KeyboardStateChanged() in cros_ec/keyboard.c shows something. */
+
+  return 0;
+}
+
+
+int main(int argc, char **argv) {
+
+  EcError ret;
+
+  /* Call Google EC core initial code. */
+  ret = CoreMain();
+  if (ret != EC_SUCCESS)
+    return 1;
+
+  return run_test_cases();
+}