[U-Boot] [PATCH v2 6/9] dm: led: Support toggling LEDs

[Simon Glass]

Add support for toggling an LED into the uclass interface. This can be
efficiently implemented by the driver.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Drop the explicit assignment to LEDST_TOGGLE

 drivers/led/led_gpio.c |  7 +++++++
 include/led.h          |  1 +
 test/dm/led.c          | 25 +++++++++++++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/drivers/led/led_gpio.c b/drivers/led/led_gpio.c
index 789d15600f..4106ecb679 100644
--- a/drivers/led/led_gpio.c
+++ b/drivers/led/led_gpio.c
@@ -21,6 +21,7 @@ struct led_gpio_priv {
 static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
 {
 	struct led_gpio_priv *priv = dev_get_priv(dev);
+	int ret;
 
 	if (!dm_gpio_is_valid(&priv->gpio))
 		return -EREMOTEIO;
@@ -28,6 +29,12 @@ static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
 	case LEDST_OFF:
 	case LEDST_ON:
 		break;
+	case LEDST_TOGGLE:
+		ret = dm_gpio_get_value(&priv->gpio);
+		if (ret < 0)
+			return ret;
+		state = !ret;
+		break;
 	default:
 		return -ENOSYS;
 	}
diff --git a/include/led.h b/include/led.h
index bbab4d14c9..8c107e28e7 100644
--- a/include/led.h
+++ b/include/led.h
@@ -20,6 +20,7 @@ struct led_uc_plat {
 enum led_state_t {
 	LEDST_OFF = 0,
 	LEDST_ON = 1,
+	LEDST_TOGGLE,
 
 	LEDST_COUNT,
 };
diff --git a/test/dm/led.c b/test/dm/led.c
index 68aa39bd4d..2cc24127e2 100644
--- a/test/dm/led.c
+++ b/test/dm/led.c
@@ -53,6 +53,31 @@ static int dm_test_led_gpio(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_led_gpio, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
 
+/* Test that we can toggle LEDs */
+static int dm_test_led_toggle(struct unit_test_state *uts)
+{
+	const int offset = 1;
+	struct udevice *dev, *gpio;
+
+	/*
+	 * Check that we can manipulate an LED. LED 1 is connected to GPIO
+	 * bank gpio_a, offset 1.
+	 */
+	ut_assertok(uclass_get_device(UCLASS_LED, 1, &dev));
+	ut_assertok(uclass_get_device(UCLASS_GPIO, 1, &gpio));
+	ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
+	ut_assertok(led_set_state(dev, LEDST_TOGGLE));
+	ut_asserteq(1, sandbox_gpio_get_value(gpio, offset));
+	ut_asserteq(LEDST_ON, led_get_state(dev));
+
+	ut_assertok(led_set_state(dev, LEDST_TOGGLE));
+	ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
+	ut_asserteq(LEDST_OFF, led_get_state(dev));
+
+	return 0;
+}
+DM_TEST(dm_test_led_toggle, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
 /* Test obtaining an LED by label */
 static int dm_test_led_label(struct unit_test_state *uts)
 {
-- 
2.12.2.715.g7642488e1d-goog