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authorSimon Glass <sjg@chromium.org>2015-06-23 15:38:45 -0600
committerSimon Glass <sjg@chromium.org>2015-07-21 17:39:24 -0600
commit5917112c9e9f7a60062c604b3224bd5713c41f46 (patch)
tree71c53336a056df66ac8ac1b1874f1c60f0d82a0a /include/led.h
parent5725128507eca41bb110d702858ca2c8d7dc4085 (diff)
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dm: Add support for LEDs
Add a simple uclass for LEDs, so that these can be controlled by the device tree and activated when needed. LEDs are referred to by their label. This implementation requires a driver for each type of LED (e.g GPIO, I2C). Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/led.h')
-rw-r--r--include/led.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/include/led.h b/include/led.h
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+++ b/include/led.h
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+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __LED_H
+#define __LED_H
+
+/**
+ * struct led_uclass_plat - Platform data the uclass stores about each device
+ *
+ * @label: LED label
+ */
+struct led_uclass_plat {
+ const char *label;
+};
+
+struct led_ops {
+ /**
+ * set_on() - set the state of an LED
+ *
+ * @dev: LED device to change
+ * @on: 1 to turn the LED on, 0 to turn it off
+ * @return 0 if OK, -ve on error
+ */
+ int (*set_on)(struct udevice *dev, int on);
+};
+
+#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
+
+/**
+ * led_get_by_label() - Find an LED device by label
+ *
+ * @label: LED label to look up
+ * @devp: Returns the associated device, if found
+ * @return 0 if found, -ve on error
+ */
+int led_get_by_label(const char *label, struct udevice **devp);
+
+/**
+ * led_set_on() - set the state of an LED
+ *
+ * @dev: LED device to change
+ * @on: 1 to turn the LED on, 0 to turn it off
+ * @return 0 if OK, -ve on error
+ */
+int led_set_on(struct udevice *dev, int on);
+
+#endif