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>
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c7e526c..5ebc89d 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -20,6 +20,8 @@
source "drivers/input/Kconfig"
+source "drivers/led/Kconfig"
+
source "drivers/serial/Kconfig"
source "drivers/tpm/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 405b64b..c090aba 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -7,6 +7,7 @@
obj-y += crypto/
obj-$(CONFIG_FPGA) += fpga/
obj-y += hwmon/
+obj-$(CONFIG_LED) += led/
obj-y += misc/
obj-y += pcmcia/
obj-y += dfu/
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
new file mode 100644
index 0000000..e4d9a84
--- /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 0000000..b39b205
--- /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 0000000..a80ae93
--- /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),
+};