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dm: led: Add support for blinking LEDs

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Allow LEDs to be blinked if the driver supports it. Enable this for
sandbox so that the tests run.

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 11:34:57 -06:00
parent 9413ad4f0d
commit 53378dac8d
7 changed files with 83 additions and 0 deletions
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35
include/led.h
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@@ -17,10 +17,22 @@ struct led_uc_plat {
const char *label;
};
/**
* struct led_uc_priv - Private data the uclass stores about each device
*
* @period_ms: Flash period in milliseconds
*/
struct led_uc_priv {
int period_ms;
};
enum led_state_t {
LEDST_OFF = 0,
LEDST_ON = 1,
LEDST_TOGGLE,
#ifdef CONFIG_LED_BLINK
LEDST_BLINK,
#endif
LEDST_COUNT,
};
@@ -42,6 +54,20 @@ struct led_ops {
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
#ifdef CONFIG_LED_BLINK
/**
* led_set_period() - set the blink period of an LED
*
* Thie records the period if supported, or returns -ENOSYS if not.
* To start the LED blinking, use set_state().
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int (*set_period)(struct udevice *dev, int period_ms);
#endif
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
@@ -72,4 +98,13 @@ int led_set_state(struct udevice *dev, enum led_state_t state);
*/
enum led_state_t led_get_state(struct udevice *dev);
/**
* led_set_period() - set the blink period of an LED
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int led_set_period(struct udevice *dev, int period_ms);
#endif