From: Ziping Chen <techping.c...@gmail.com>
Sometimes we need to read back the status of a LED.
Add a led_get_status function for DM LED support, and add a get_status
function for the driver to implement this function.
Signed-off-by: Ziping Chen <techping.c...@gmail.com>
---
drivers/led/led-uclass.c | 10 ++++++++++
include/led.h | 15 +++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c
index 784ac87..304b92a 100644
--- a/drivers/led/led-uclass.c
+++ b/drivers/led/led-uclass.c
@@ -42,6 +42,16 @@ int led_set_on(struct udevice *dev, int on)
return ops->set_on(dev, on);
}
+int led_get_status(struct udevice *dev)
+{
+ struct led_ops *ops = led_get_ops(dev);
+
+ if (!ops->get_status)
+ return -ENOSYS;
+
+ return ops->get_status(dev);
+}
+
UCLASS_DRIVER(led) = {
.id = UCLASS_LED,
.name = "led",
diff --git a/include/led.h b/include/led.h
index b929d0c..cd6fe98 100644
--- a/include/led.h
+++ b/include/led.h
@@ -26,6 +26,13 @@ struct led_ops {
* @return 0 if OK, -ve on error
*/
int (*set_on)(struct udevice *dev, int on);
+ /**
+ * led_get_status() - get the state of an LED
+ *
+ * @dev: LED device to query
+ * @return 0 if LED off, 1 if LED on, -ve on error
+ */
+ int (*get_status)(struct udevice *dev);
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
@@ -48,4 +55,12 @@ int led_get_by_label(const char *label, struct udevice
**devp);
*/
int led_set_on(struct udevice *dev, int on);
+/**
+ * led_get_status() - get the state of an LED
+ *
+ * @dev: LED device to query
+ * @return 0 if LED off, 1 if LED on, -ve on error
+ */
+int led_get_status(struct udevice *dev);
+
#endif
--
2.7.4
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