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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 /drivers/led
parent5725128507eca41bb110d702858ca2c8d7dc4085 (diff)
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 'drivers/led')
-rw-r--r--drivers/led/Kconfig17
-rw-r--r--drivers/led/Makefile8
-rw-r--r--drivers/led/led-uclass.c48
3 files changed, 73 insertions, 0 deletions
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
new file mode 100644
index 0000000000..e4d9a84b1d
--- /dev/null
+++ b/drivers/led/Kconfig
@@ -0,0 +1,17 @@
+config LED
+ bool "Enable LED support"
+ depends on DM
+ help
+ Many boards have LEDs which can be used to signal status or alerts.
+ U-Boot provides a uclass API to implement this feature. LED drivers
+ can provide access to board-specific LEDs. Use of the device tree
+ for configuration is encouraged.
+
+config SPL_LED_SUPPORT
+ bool "Enable LED support in SPL"
+ depends on LED
+ help
+ The LED subsystem adds a small amount of overhead to the image.
+ If this is acceptable and you have a need to use LEDs in SPL,
+ enable this option. You will need to enable device tree in SPL
+ for this to work.
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
new file mode 100644
index 0000000000..b39b20581b
--- /dev/null
+++ b/drivers/led/Makefile
@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2015 Google, Inc
+# Written by Simon Glass <sjg@chromium.org>
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_LED) += led-uclass.o
diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c
new file mode 100644
index 0000000000..a80ae93d45
--- /dev/null
+++ b/drivers/led/led-uclass.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <led.h>
+#include <dm/root.h>
+#include <dm/uclass-internal.h>
+
+int led_get_by_label(const char *label, struct udevice **devp)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int ret;
+
+ ret = uclass_get(UCLASS_LED, &uc);
+ if (ret)
+ return ret;
+ uclass_foreach_dev(dev, uc) {
+ struct led_uclass_plat *uc_plat = dev_get_uclass_platdata(dev);
+
+ if (!strcmp(label, uc_plat->label))
+ return uclass_get_device_tail(dev, 0, devp);
+ }
+
+ return -ENOENT;
+}
+
+int led_set_on(struct udevice *dev, int on)
+{
+ struct led_ops *ops = led_get_ops(dev);
+
+ if (!ops->set_on)
+ return -ENOSYS;
+
+ return ops->set_on(dev, on);
+}
+
+UCLASS_DRIVER(led) = {
+ .id = UCLASS_LED,
+ .name = "led",
+ .per_device_platdata_auto_alloc_size = sizeof(struct led_uclass_plat),
+};