Add a test of keyboard debouncing

This test checks keyboard debouncing works correctly.

BUG=chrome-os-partner:10284
TEST=Test passed

Change-Id: I0c984ecc9444b149da580ff0775cc81245b21a1e
Reviewed-on: https://gerrit.chromium.org/gerrit/26021
Commit-Ready: Vic Yang <victoryang@chromium.org>
Reviewed-by: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>

test/build.mk

@@ -7,7 +7,7 @@
 #
 
 test-list=hello pingpong timer_calib timer_dos timer_jump mutex thermal
-test-list+=power_button kb_deghost scancode typematic
+test-list+=power_button kb_deghost kb_debounce scancode typematic
 #disable: powerdemo
 
 pingpong-y=pingpong.o
@@ -39,3 +39,7 @@ common-mock-scancode-i8042.o=mock_i8042.o
 # Mock modules for 'typematic'
 chip-mock-typematic-keyboard_scan_stub.o=mock_keyboard_scan_stub.o
 common-mock-typematic-i8042.o=mock_i8042.o
+
+# Mock modules for 'kb_debounce'
+chip-mock-kb_debounce-keyboard_scan_stub.o=mock_keyboard_scan_stub.o
+common-mock-kb_debounce-i8042.o=mock_i8042.o

test/kb_debounce.py

@@ -0,0 +1,103 @@
+# Copyright (c) 2012 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.
+#
+# Keyboard debounce test
+#
+
+import time
+
+SHORTER_THAN_DEBOUNCE_TIME = 0.005 # 5ms
+LONGER_THAN_DEBOUNCE_TIME = 0.020 # 20ms
+KEYPRESS_REGEX = "\[KB raw state: (?P<km>[0-9\s-]*)\]"
+
+def check_no_output(helper, reg_ex):
+    success = False
+    try:
+        helper.wait_output(reg_ex, use_re=True, timeout=1)
+    except:
+        success = True
+    return success
+
+def consume_output(helper, reg_ex):
+    done = False
+    while not done:
+        try:
+            helper.wait_output(reg_ex, use_re=True, timeout=1)
+        except:
+            done = True
+
+def get_key_count(s):
+    key_count_map = {'1': 1, '2': 1, '3': 2, '4': 1, '5': 2, '6': 2, '7': 3,
+                     '8': 1, '9': 2, 'a': 2, 'b': 3, 'c': 2, 'd': 3, 'e': 3,
+                     'e': 4, '-': 0, ' ': 0, '0': 0}
+    return reduce(lambda x, y: x + key_count_map[y], s, 0)
+
+def expect_key_count(helper, cnt):
+    s = helper.wait_output(KEYPRESS_REGEX, use_re=True, timeout=1)["km"]
+    act_cnt = get_key_count(s)
+    if act_cnt != cnt:
+        helper.trace("Expecting %d key press, got %d." % (cnt, act_cnt))
+        return False
+    else:
+        return True
+
+def test(helper):
+      # Wait for EC initialized
+      helper.wait_output("--- UART initialized")
+
+      # Enable keyboard scanning and disable typematic
+      helper.ec_command("kbd enable")
+      helper.ec_command("typematic 1000000 1000000")
+
+      # Press for a short period and check this is ignored
+      consume_output(helper, KEYPRESS_REGEX)
+      helper.ec_command("mockmatrix 1 1 1")
+      time.sleep(SHORTER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 1 1 0")
+      if not check_no_output(helper, KEYPRESS_REGEX):
+          return False
+
+      # Press for a longer period and check keypress is accepted
+      consume_output(helper, KEYPRESS_REGEX)
+      helper.ec_command("mockmatrix 1 1 1")
+      time.sleep(LONGER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 1 1 0")
+      if not expect_key_count(helper, 1): # Press
+          return False
+      if not expect_key_count(helper, 0): # Release
+          return False
+
+      # Press and release for a short period, and then press for a longer
+      # period and check exactly one keypress is accepted
+      consume_output(helper, KEYPRESS_REGEX)
+      helper.ec_command("mockmatrix 1 1 1")
+      time.sleep(SHORTER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 1 1 0")
+      time.sleep(SHORTER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 1 1 1")
+      time.sleep(LONGER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 1 1 0")
+      if not expect_key_count(helper, 1): # Press
+          return False
+      if not expect_key_count(helper, 0): # Release
+          return False
+      if not check_no_output(helper, KEYPRESS_REGEX):
+          return False
+
+      # Hold down a key and press another key for a short period. Expect
+      # this event is ignored
+      consume_output(helper, KEYPRESS_REGEX)
+      helper.ec_command("mockmatrix 1 1 1")
+      if not expect_key_count(helper, 1):
+          return False
+      helper.ec_command("mockmatrix 2 2 1")
+      time.sleep(SHORTER_THAN_DEBOUNCE_TIME)
+      helper.ec_command("mockmatrix 2 2 0")
+      if not check_no_output(helper, KEYPRESS_REGEX):
+          return False
+      helper.ec_command("mockmatrix 1 1 0")
+      if not expect_key_count(helper, 0):
+          return False
+
+      return True # Pass!

test/kb_debounce.tasklist

@@ -0,0 +1,24 @@
+/* Copyright (c) 2012 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.
+ */
+
+/**
+ * List of enabled tasks in the priority order
+ *
+ * The first one has the lowest priority.
+ *
+ * For each task, use the macro TASK(n, r, d) where :
+ * 'n' in the name of the task
+ * 'r' in the main routine of the task
+ * 'd' in an opaque parameter passed to the routine at startup
+ */
+#define CONFIG_TASK_LIST \
+	TASK(WATCHDOG, watchdog_task, NULL) \
+	TASK(PWM, pwm_task, NULL) \
+	TASK(TYPEMATIC, keyboard_typematic_task, NULL) \
+	TASK(X86POWER, x86_power_task, NULL) \
+	TASK(I8042CMD, i8042_command_task, NULL) \
+	TASK(KEYSCAN, keyboard_scan_task, NULL) \
+	TASK(POWERBTN, power_button_task, NULL) \
+	TASK(CONSOLE, console_task, NULL)