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dm: led: Add support for getting the state of an LED

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It is useful to be able to read the LED as well as write it. Add this to
the uclass and update the GPIO driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ziping Chen <techping.chan@gmail.com>
This commit is contained in:
Simon Glass
2017-04-10 11:34:55 -06:00
parent ddae9fcddc
commit 8f4b612333
4 changed files with 50 additions and 0 deletions
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16
include/led.h
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@@ -33,6 +33,14 @@ struct led_ops {
* @return 0 if OK, -ve on error
*/
int (*set_state)(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
@@ -55,4 +63,12 @@ int led_get_by_label(const char *label, struct udevice **devp);
*/
int led_set_state(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t led_get_state(struct udevice *dev);
#endif