Emulator support of fake GPIO input

For all GPIOs, the current values are recorded. A test can then change
the value of a GPIO input by gpio_set_level(). The changed value is
recorded and also interrupt is fired if the change fits the interrupt
flags defined in board/host/board.c.

BUG=chrome-os-partner:19235
TEST=Pass all tests
BRANCH=None

Change-Id: If8e547e5adf4a20dcb118f5fe2187293005d4ca3
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/170907
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

9 files changed, 79 insertions, 119 deletions

diff --git a/board/host/board.c b/board/host/board.c
index c48a1d3c44..3fdc75f163 100644
--- a/board/host/board.c
+++ b/board/host/board.c
@@ -4,19 +4,23 @@
  */
 /* Emulator board-specific configuration */
 
+#include "extpower.h"
 #include "gpio.h"
+#include "lid_switch.h"
+#include "power_button.h"
 #include "temp_sensor.h"
 #include "util.h"
 
 #define MOCK_GPIO(x) {#x, 0, 0, 0, 0}
+#define MOCK_GPIO_INT(x, i, r) {#x, 0, 0, i, r}
 
 const struct gpio_info gpio_list[] = {
 	MOCK_GPIO(EC_INT),
-	MOCK_GPIO(LID_OPEN),
-	MOCK_GPIO(POWER_BUTTON_L),
+	MOCK_GPIO_INT(LID_OPEN, GPIO_INT_BOTH, lid_interrupt),
+	MOCK_GPIO_INT(POWER_BUTTON_L, GPIO_INT_BOTH, power_button_interrupt),
 	MOCK_GPIO(WP),
 	MOCK_GPIO(ENTERING_RW),
-	MOCK_GPIO(AC_PRESENT),
+	MOCK_GPIO_INT(AC_PRESENT, GPIO_INT_BOTH, extpower_interrupt),
 	MOCK_GPIO(PCH_BKLTEN),
 	MOCK_GPIO(ENABLE_BACKLIGHT),
 };
diff --git a/chip/host/gpio.c b/chip/host/gpio.c
index 64191aaca5..2fcb32b2a8 100644
--- a/chip/host/gpio.c
+++ b/chip/host/gpio.c
@@ -5,8 +5,15 @@
 
 /* GPIO module for emulator */
 
+#include "console.h"
+
 #include "common.h"
 #include "gpio.h"
+#include "timer.h"
+#include "util.h"
+
+static int gpio_values[GPIO_COUNT];
+static int gpio_interrupt_enabled[GPIO_COUNT];
 
 test_mockable void gpio_pre_init(void)
 {
@@ -15,16 +22,42 @@ test_mockable void gpio_pre_init(void)
 
 test_mockable int gpio_get_level(enum gpio_signal signal)
 {
+	return gpio_values[signal];
+}
+
+static int gpio_interrupt_check(uint32_t flags, int old, int new)
+{
+	if ((flags & (GPIO_INT_F_RISING|GPIO_INT_F_BOTH)) &&
+	    old == 0 && new == 1)
+		return 1;
+	if ((flags & (GPIO_INT_F_FALLING|GPIO_INT_F_BOTH)) &&
+	    old == 1 && new == 0)
+		return 1;
+	if ((flags & GPIO_INT_F_LOW) && new == 0)
+		return 1;
+	if ((flags & GPIO_INT_F_HIGH) && new == 1)
+		return 1;
 	return 0;
 }
 
 test_mockable void gpio_set_level(enum gpio_signal signal, int value)
 {
-	/* Nothing */
+	const struct gpio_info *g = gpio_list + signal;
+	const uint32_t flags = g->flags;
+	const int old_value = gpio_values[signal];
+
+	gpio_values[signal] = value;
+
+	if (g->irq_handler == NULL || !gpio_interrupt_enabled[signal])
+		return;
+
+	if (gpio_interrupt_check(flags, old_value, value))
+		g->irq_handler(signal);
 }
 
 test_mockable int gpio_enable_interrupt(enum gpio_signal signal)
 {
+	gpio_interrupt_enabled[signal] = 1;
 	return EC_SUCCESS;
 }
 
diff --git a/test/adapter.c b/test/adapter.c
index 4a93e6089a..5ce9733b4b 100644
--- a/test/adapter.c
+++ b/test/adapter.c
@@ -22,14 +22,13 @@
 #include "adapter_externs.h"
 
 /* Local state */
-static int mock_ac;
 static int mock_id;
 static int mock_current;
 static struct power_state_context ctx;
 
 static void test_reset_mocks(void)
 {
-	mock_ac = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	mock_id = 0;
 	mock_current = 0;
 	memset(&ctx, 0, sizeof(ctx));
@@ -37,13 +36,6 @@ static void test_reset_mocks(void)
 
 /* Mocked functions from the rest of the EC */
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_AC_PRESENT)
-		return mock_ac;
-	return 0;
-}
-
 int adc_read_channel(enum adc_channel ch)
 {
 	switch (ch) {
@@ -83,8 +75,7 @@ void chipset_throttle_cpu(int throttle)
 
 static void change_ac(int val)
 {
-	mock_ac = val;
-	extpower_interrupt(GPIO_AC_PRESENT);
+	gpio_set_level(GPIO_AC_PRESENT, val);
 	msleep(50);
 }
 
@@ -183,6 +174,7 @@ static int test_turbo(void)
 	TEST_ASSERT(ac_turbo == 0);
 
 	test_turbo_init();
+	change_ac(0);
 	set_id(ad_id_vals[1].lo - 1);
 	change_ac(1);
 	watch_adapter_closely(&ctx);
diff --git a/test/extpwr_gpio.c b/test/extpwr_gpio.c
index c10dad6627..e2a6f830bf 100644
--- a/test/extpwr_gpio.c
+++ b/test/extpwr_gpio.c
@@ -15,22 +15,11 @@
 #include "timer.h"
 #include "util.h"
 
-static int mock_ac;
 static int ac_hook_count;
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_AC_PRESENT)
-		return mock_ac;
-	return 0;
-}
-
 static void set_ac(int val)
 {
-	if (val == mock_ac)
-		return;
-	mock_ac = val;
-	extpower_interrupt(GPIO_AC_PRESENT);
+	gpio_set_level(GPIO_AC_PRESENT, val);
 	msleep(50);
 }
 
diff --git a/test/kb_8042.c b/test/kb_8042.c
index 0bac5fedcf..88bae5d633 100644
--- a/test/kb_8042.c
+++ b/test/kb_8042.c
@@ -29,8 +29,6 @@ static unsigned int lpc_char_cnt;
 /*****************************************************************************/
 /* Mock functions */
 
-static int mock_power_button = 1;
-
 int lid_is_open(void)
 {
 	return 1;
@@ -41,13 +39,6 @@ void lpc_keyboard_put_char(uint8_t chr, int send_irq)
 	lpc_char_buf[lpc_char_cnt++] = chr;
 }
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_POWER_BUTTON_L)
-		return mock_power_button;
-	return 0;
-}
-
 /*****************************************************************************/
 /* Test utilities */
 
@@ -209,33 +200,27 @@ static int test_power_button(void)
 	set_scancode(1);
 	test_chipset_on();
 
-	mock_power_button = 0;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 0);
 	VERIFY_LPC_CHAR_DELAY("\xe0\x5e", 100);
 
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	VERIFY_LPC_CHAR_DELAY("\xe0\xde", 100);
 
 	set_scancode(2);
 	write_cmd_byte(read_cmd_byte() & ~I8042_XLATE);
 
-	mock_power_button = 0;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 0);
 	VERIFY_LPC_CHAR_DELAY("\xe0\x37", 100);
 
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	VERIFY_LPC_CHAR_DELAY("\xe0\xf0\x37", 100);
 
 	test_chipset_off();
 
-	mock_power_button = 0;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 0);
 	VERIFY_NO_CHAR();
 
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	VERIFY_NO_CHAR();
 
 	return EC_SUCCESS;
diff --git a/test/led_lp5562.c b/test/led_lp5562.c
index fe99d5eb44..79f01b297f 100644
--- a/test/led_lp5562.c
+++ b/test/led_lp5562.c
@@ -24,7 +24,6 @@ static uint8_t lp5562_reg[LP5562_NUM_WATCH_REG];
 #define LED_COLOR_YELLOW LP5562_COLOR_BLUE(0x40)
 #define LED_COLOR_RED    LP5562_COLOR_RED(0x80)
 
-static int mock_ac;
 static enum charging_state mock_charge_state = ST_IDLE;
 static int lp5562_failed_i2c_reg = -1;
 static const char * const state_names[] = POWER_STATE_NAME_TABLE;
@@ -32,16 +31,9 @@ static const char * const state_names[] = POWER_STATE_NAME_TABLE;
 /*****************************************************************************/
 /* Mock functions */
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_AC_PRESENT)
-		return mock_ac;
-	return 0;
-}
-
 static void set_ac(int ac)
 {
-	mock_ac = ac;
+	gpio_set_level(GPIO_AC_PRESENT, ac);
 	ccprintf("[%T TEST AC = %d]\n", ac);
 }
 
diff --git a/test/lid_sw.c b/test/lid_sw.c
index 52a4d033cb..dbd009990d 100644
--- a/test/lid_sw.c
+++ b/test/lid_sw.c
@@ -7,6 +7,7 @@
 
 #include "common.h"
 #include "console.h"
+#include "gpio.h"
 #include "hooks.h"
 #include "host_command.h"
 #include "lid_switch.h"
@@ -14,16 +15,8 @@
 #include "timer.h"
 #include "util.h"
 
-static int mock_lid;
 static int lid_hook_count;
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_LID_OPEN)
-		return mock_lid;
-	return 0;
-}
-
 static void lid_change_hook(void)
 {
 	lid_hook_count++;
@@ -39,14 +32,12 @@ int lid_memmap_state(void)
 static int test_hook(void)
 {
 	/* Close lid for testing */
-	mock_lid = 0;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 0);
 	msleep(100);
 	lid_hook_count = 0;
 	host_clear_events(0xffffffff);
 
-	mock_lid = 1;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 1);
 	msleep(50);
 	TEST_ASSERT(lid_hook_count == 1);
 	TEST_ASSERT(lid_is_open());
@@ -54,8 +45,7 @@ static int test_hook(void)
 	TEST_ASSERT(host_get_events() &
 		    EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_OPEN));
 
-	mock_lid = 0;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 0);
 	msleep(50);
 	TEST_ASSERT(lid_hook_count == 2);
 	TEST_ASSERT(!lid_is_open());
@@ -69,14 +59,12 @@ static int test_hook(void)
 static int test_debounce(void)
 {
 	/* Close lid for testing */
-	mock_lid = 0;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 0);
 	msleep(100);
 	lid_hook_count = 0;
 	host_clear_events(0xffffffff);
 
-	mock_lid = 1;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 1);
 	msleep(20);
 	TEST_ASSERT(lid_hook_count == 0);
 	TEST_ASSERT(!lid_is_open());
@@ -84,8 +72,7 @@ static int test_debounce(void)
 	TEST_ASSERT(!(host_get_events() &
 		      EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_OPEN)));
 
-	mock_lid = 0;
-	lid_interrupt(GPIO_LID_OPEN);
+	gpio_set_level(GPIO_LID_OPEN, 0);
 	msleep(50);
 	TEST_ASSERT(lid_hook_count == 0);
 	TEST_ASSERT(!lid_is_open());
diff --git a/test/power_button.c b/test/power_button.c
index 5f7231b9f4..1205cfcca4 100644
--- a/test/power_button.c
+++ b/test/power_button.c
@@ -7,6 +7,7 @@
 
 #include "common.h"
 #include "console.h"
+#include "gpio.h"
 #include "hooks.h"
 #include "host_command.h"
 #include "power_button.h"
@@ -14,20 +15,11 @@
 #include "timer.h"
 #include "util.h"
 
-static int mock_power_button = 1;
-static int mock_lid = 1;
 static int pb_hook_count;
 
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_POWER_BUTTON_L)
-		return mock_power_button;
-	return 0;
-}
-
 int lid_is_open(void)
 {
-	return mock_lid;
+	return 1;
 }
 
 static void pb_change_hook(void)
@@ -45,14 +37,12 @@ int pb_memmap_state(void)
 static int test_hook(void)
 {
 	/* Release power button for testing */
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	msleep(100);
 	pb_hook_count = 0;
 	host_clear_events(0xffffffff);
 
-	mock_power_button = 0;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 0);
 	msleep(50);
 	TEST_ASSERT(pb_hook_count == 1);
 	TEST_ASSERT(power_button_is_pressed());
@@ -61,8 +51,7 @@ static int test_hook(void)
 		    EC_HOST_EVENT_MASK(EC_HOST_EVENT_POWER_BUTTON));
 	host_clear_events(0xffffffff);
 
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	msleep(50);
 	TEST_ASSERT(pb_hook_count == 2);
 	TEST_ASSERT(!power_button_is_pressed());
@@ -76,14 +65,12 @@ static int test_hook(void)
 static int test_debounce(void)
 {
 	/* Release power button for testing */
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	msleep(100);
 	pb_hook_count = 0;
 	host_clear_events(0xffffffff);
 
-	mock_power_button = 0;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 0);
 	msleep(20);
 	TEST_ASSERT(pb_hook_count == 0);
 	TEST_ASSERT(!power_button_is_pressed());
@@ -91,8 +78,7 @@ static int test_debounce(void)
 	TEST_ASSERT(!(host_get_events() &
 		      EC_HOST_EVENT_MASK(EC_HOST_EVENT_POWER_BUTTON)));
 
-	mock_power_button = 1;
-	power_button_interrupt(GPIO_POWER_BUTTON_L);
+	gpio_set_level(GPIO_POWER_BUTTON_L, 1);
 	msleep(50);
 	TEST_ASSERT(pb_hook_count == 0);
 	TEST_ASSERT(!power_button_is_pressed());
diff --git a/test/sbs_charging.c b/test/sbs_charging.c
index a411504ff2..adfc053e01 100644
--- a/test/sbs_charging.c
+++ b/test/sbs_charging.c
@@ -10,6 +10,7 @@
 #include "chipset.h"
 #include "common.h"
 #include "ec_commands.h"
+#include "gpio.h"
 #include "hooks.h"
 #include "host_command.h"
 #include "smart_battery.h"
@@ -20,20 +21,11 @@
 #define WAIT_CHARGER_TASK 500
 #define BATTERY_DETACH_DELAY 35000
 
-static int mock_ac_present = 1;
 static int mock_chipset_state = CHIPSET_STATE_ON;
 static int is_shutdown;
 static int is_force_discharge;
 static int is_hibernated;
 
-/* Mock GPIOs */
-int gpio_get_level(enum gpio_signal signal)
-{
-	if (signal == GPIO_AC_PRESENT)
-		return mock_ac_present;
-	return 0;
-}
-
 void chipset_force_shutdown(void)
 {
 	is_shutdown = 1;
@@ -72,7 +64,7 @@ static void test_setup(void)
 	/* Discharging at 100mAh */
 	sb_write(SB_CURRENT, -100);
 	/* Unplug AC */
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 }
 
 static int wait_charging_state(void)
@@ -100,7 +92,7 @@ static int test_charge_state(void)
 	state = wait_charging_state();
 	/* Plug AC, charging at 1000mAh */
 	ccprintf("[CHARGING TEST] AC on\n");
-	mock_ac_present = 1;
+	gpio_set_level(GPIO_AC_PRESENT, 1);
 	sb_write(SB_CURRENT, 1000);
 	state = wait_charging_state();
 	TEST_ASSERT(state == PWR_STATE_CHARGE);
@@ -121,14 +113,14 @@ static int test_charge_state(void)
 
 	/* Unplug AC, discharging at 1000mAh */
 	ccprintf("[CHARGING TEST] AC off\n");
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	sb_write(SB_CURRENT, -1000);
 	state = wait_charging_state();
 	TEST_ASSERT(state == PWR_STATE_DISCHARGE);
 
 	/* Discharging overtemp */
 	ccprintf("[CHARGING TEST] AC off, batt temp = 90 C\n");
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	sb_write(SB_CURRENT, -1000);
 
 	state = wait_charging_state();
@@ -141,7 +133,7 @@ static int test_charge_state(void)
 
 	/* Force idle */
 	ccprintf("[CHARGING TEST] AC on, force idle\n");
-	mock_ac_present = 1;
+	gpio_set_level(GPIO_AC_PRESENT, 1);
 	sb_write(SB_CURRENT, 1000);
 	state = wait_charging_state();
 	TEST_ASSERT(state == PWR_STATE_CHARGE);
@@ -154,7 +146,7 @@ static int test_charge_state(void)
 
 	/* Force discharge */
 	ccprintf("[CHARGING TEST] AC on, force discharge\n");
-	mock_ac_present = 1;
+	gpio_set_level(GPIO_AC_PRESENT, 1);
 	sb_write(SB_CURRENT, 1000);
 	charge_control(CHARGE_CONTROL_DISCHARGE);
 	state = wait_charging_state();
@@ -171,7 +163,7 @@ static int test_charge_state(void)
 static int test_low_battery(void)
 {
 	ccprintf("[CHARGING TEST] Low battery with AC\n");
-	mock_ac_present = 1;
+	gpio_set_level(GPIO_AC_PRESENT, 1);
 	is_hibernated = 0;
 	sb_write(SB_CURRENT, 1000);
 	sb_write(SB_RELATIVE_STATE_OF_CHARGE, 2);
@@ -184,7 +176,7 @@ static int test_low_battery(void)
 	mock_chipset_state = CHIPSET_STATE_ON;
 	hook_notify(HOOK_CHIPSET_PRE_INIT);
 	hook_notify(HOOK_CHIPSET_STARTUP);
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	is_hibernated = 0;
 	sb_write(SB_CURRENT, -1000);
 	sb_write(SB_RELATIVE_STATE_OF_CHARGE, 2);
@@ -205,10 +197,10 @@ static int test_low_battery(void)
 	is_shutdown = 0;
 	mock_chipset_state = CHIPSET_STATE_ON;
 	sb_write(SB_RELATIVE_STATE_OF_CHARGE, 10);
-	mock_ac_present = 1;
+	gpio_set_level(GPIO_AC_PRESENT, 1);
 	sb_write(SB_CURRENT, 1000);
 	wait_charging_state();
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	sb_write(SB_CURRENT, -1000);
 	sb_write(SB_RELATIVE_STATE_OF_CHARGE, 2);
 	wait_charging_state();
@@ -225,7 +217,7 @@ static int test_batt_fake(void)
 	mock_chipset_state = CHIPSET_STATE_ON;
 	hook_notify(HOOK_CHIPSET_PRE_INIT);
 	hook_notify(HOOK_CHIPSET_STARTUP);
-	mock_ac_present = 0;
+	gpio_set_level(GPIO_AC_PRESENT, 0);
 	is_hibernated = 0;
 	sb_write(SB_CURRENT, -1000);
 	sb_write(SB_RELATIVE_STATE_OF_CHARGE, 30);