Support backlight control via lid only

The old backlight_x86 code did

  (backlight enable) = (lid is open) && (GPIO request from AP)

Newer systems will AND those signals in hardware.  Support those
systems by separating CONFIG_BACKLIGHT_LID and
CONFIG_BACKLIGHT_REQ_GPIO, and add tests for the case where the enable
signal is dependent only on the lid position.

BUG=chrome-os-partner:22960
BRANCH=none
TEST=pass unit tests

Change-Id: I1909426e49f00a8acd5047fd88c801cba1dacd76
Reviewed-on: https://chromium-review.googlesource.com/170925
Tested-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Randall Spangler <rspangler@chromium.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/test/bklight_lid.c b/test/bklight_lid.c
new file mode 100644
index 0000000000..9cdd3741a2
--- /dev/null
+++ b/test/bklight_lid.c
@@ -0,0 +1,106 @@
+/* Copyright (c) 2013 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.
+ *
+ * Test backlight control based on lid
+ */
+
+#include "backlight.h"
+#include "common.h"
+#include "console.h"
+#include "hooks.h"
+#include "host_command.h"
+#include "lid_switch.h"
+#include "test_util.h"
+#include "timer.h"
+#include "util.h"
+
+static int mock_lid = 1;
+static int backlight_en;
+
+int gpio_get_level(enum gpio_signal signal)
+{
+	if (signal == GPIO_LID_OPEN)
+		return mock_lid;
+	return 0;
+}
+
+void gpio_set_level(enum gpio_signal signal, int level)
+{
+	if (signal == GPIO_ENABLE_BACKLIGHT)
+		backlight_en = level;
+}
+
+void set_lid_state(int is_open)
+{
+	mock_lid = is_open;
+	lid_interrupt(GPIO_LID_OPEN);
+	msleep(40);
+}
+
+static int send_bklight_hostcmd(int enabled)
+{
+	struct ec_params_switch_enable_backlight p;
+	p.enabled = enabled;
+
+	return test_send_host_command(EC_CMD_SWITCH_ENABLE_BKLIGHT, 0, &p,
+				      sizeof(p), NULL, 0);
+}
+
+static int test_passthrough(void)
+{
+	/* Initial state */
+	TEST_ASSERT(mock_lid == 1);
+	TEST_ASSERT(backlight_en);
+
+	/* Close lid. Backlight should turn off */
+	set_lid_state(0);
+	TEST_ASSERT(!backlight_en);
+
+	/* Open lid. Backlight turns on */
+	set_lid_state(1);
+	TEST_ASSERT(backlight_en);
+
+	return EC_SUCCESS;
+}
+
+static int test_hostcommand(void)
+{
+	/* Open lid */
+	set_lid_state(1);
+	TEST_ASSERT(backlight_en);
+
+	/* Disable by host command */
+	send_bklight_hostcmd(0);
+	TEST_ASSERT(!backlight_en);
+
+	/* Close and open lid. Backlight should come up */
+	set_lid_state(0);
+	set_lid_state(1);
+	TEST_ASSERT(backlight_en);
+
+	/* Close lid */
+	set_lid_state(0);
+	TEST_ASSERT(!backlight_en);
+
+	/* Enable by host command */
+	send_bklight_hostcmd(1);
+	TEST_ASSERT(backlight_en);
+
+	/* Disable backlight by lid */
+	set_lid_state(1);
+	set_lid_state(0);
+	TEST_ASSERT(!backlight_en);
+
+	return EC_SUCCESS;
+}
+
+void run_test(void)
+{
+	test_reset();
+
+	RUN_TEST(test_passthrough);
+	RUN_TEST(test_hostcommand);
+
+	test_print_result();
+}