dm: led: Adjust the LED uclass

At present this is very simple, supporting only on and off. We want to
also support toggling and blinking. As a first step, change the name of
the main method and use an enum to indicate the state.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ziping Chen <techping.chan@gmail.com>

drivers/led/led-uclass.c

@@ -32,14 +32,14 @@ int led_get_by_label(const char *label, struct udevice **devp)
 	return -ENODEV;
 }
 
-int led_set_on(struct udevice *dev, int on)
+int led_set_state(struct udevice *dev, enum led_state_t state)
 {
 	struct led_ops *ops = led_get_ops(dev);
 
-	if (!ops->set_on)
+	if (!ops->set_state)
 		return -ENOSYS;
 
-	return ops->set_on(dev, on);
+	return ops->set_state(dev, state);
 }
 
 UCLASS_DRIVER(led) = {

drivers/led/led_gpio.c

@@ -18,14 +18,14 @@ struct led_gpio_priv {
 	struct gpio_desc gpio;
 };
 
-static int gpio_led_set_on(struct udevice *dev, int on)
+static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
 {
 	struct led_gpio_priv *priv = dev_get_priv(dev);
 
 	if (!dm_gpio_is_valid(&priv->gpio))
 		return -EREMOTEIO;
 
-	return dm_gpio_set_value(&priv->gpio, on);
+	return dm_gpio_set_value(&priv->gpio, state);
 }
 
 static int led_gpio_probe(struct udevice *dev)
@@ -87,7 +87,7 @@ static int led_gpio_bind(struct udevice *parent)
 }
 
 static const struct led_ops gpio_led_ops = {
-	.set_on		= gpio_led_set_on,
+	.set_state	= gpio_led_set_state,
 };
 
 static const struct udevice_id led_gpio_ids[] = {

include/led.h

@@ -17,15 +17,22 @@ struct led_uc_plat {
 	const char *label;
 };
 
+enum led_state_t {
+	LEDST_OFF = 0,
+	LEDST_ON = 1,
+
+	LEDST_COUNT,
+};
+
 struct led_ops {
 	/**
-	 * set_on() - set the state of an LED
+	 * set_state() - set the state of an LED
 	 *
 	 * @dev:	LED device to change
-	 * @on:		1 to turn the LED on, 0 to turn it off
+	 * @state:	LED state to set
 	 * @return 0 if OK, -ve on error
 	 */
-	int (*set_on)(struct udevice *dev, int on);
+	int (*set_state)(struct udevice *dev, enum led_state_t state);
 };
 
 #define led_get_ops(dev)	((struct led_ops *)(dev)->driver->ops)
@@ -40,12 +47,12 @@ struct led_ops {
 int led_get_by_label(const char *label, struct udevice **devp);
 
 /**
- * led_set_on() - set the state of an LED
+ * led_set_state() - set the state of an LED
  *
  * @dev:	LED device to change
- * @on:		1 to turn the LED on, 0 to turn it off
+ * @state:	LED state to set
  * @return 0 if OK, -ve on error
  */
-int led_set_on(struct udevice *dev, int on);
+int led_set_state(struct udevice *dev, enum led_state_t state);
 
 #endif

test/dm/led.c

@@ -41,9 +41,10 @@ static int dm_test_led_gpio(struct unit_test_state *uts)
 	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));
-	led_set_on(dev, 1);
+	ut_assertok(led_set_state(dev, LEDST_ON));
 	ut_asserteq(1, sandbox_gpio_get_value(gpio, offset));
-	led_set_on(dev, 0);
+
+	ut_assertok(led_set_state(dev, LEDST_OFF));
 	ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
 
 	return 0;