1 files changed, 135 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/led/led_gpio.c b/roms/u-boot/drivers/led/led_gpio.c
new file mode 100644
index 000000000..67ece3cbc
--- /dev/null
+++ b/roms/u-boot/drivers/led/led_gpio.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <led.h>
+#include <log.h>
+#include <malloc.h>
+#include <asm/gpio.h>
+#include <dm/lists.h>
+
+struct led_gpio_priv {
+	struct gpio_desc gpio;
+};
+
+static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
+{
+	struct led_gpio_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (!dm_gpio_is_valid(&priv->gpio))
+		return -EREMOTEIO;
+	switch (state) {
+	case LEDST_OFF:
+	case LEDST_ON:
+		break;
+	case LEDST_TOGGLE:
+		ret = dm_gpio_get_value(&priv->gpio);
+		if (ret < 0)
+			return ret;
+		state = !ret;
+		break;
+	default:
+		return -ENOSYS;
+	}
+
+	return dm_gpio_set_value(&priv->gpio, state);
+}
+
+static enum led_state_t gpio_led_get_state(struct udevice *dev)
+{
+	struct led_gpio_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (!dm_gpio_is_valid(&priv->gpio))
+		return -EREMOTEIO;
+	ret = dm_gpio_get_value(&priv->gpio);
+	if (ret < 0)
+		return ret;
+
+	return ret ? LEDST_ON : LEDST_OFF;
+}
+
+static int led_gpio_probe(struct udevice *dev)
+{
+	struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
+	struct led_gpio_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	/* Ignore the top-level LED node */
+	if (!uc_plat->label)
+		return 0;
+
+	ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int led_gpio_remove(struct udevice *dev)
+{
+	/*
+	 * The GPIO driver may have already been removed. We will need to
+	 * address this more generally.
+	 */
+#ifndef CONFIG_SANDBOX
+	struct led_gpio_priv *priv = dev_get_priv(dev);
+
+	if (dm_gpio_is_valid(&priv->gpio))
+		dm_gpio_free(dev, &priv->gpio);
+#endif
+
+	return 0;
+}
+
+static int led_gpio_bind(struct udevice *parent)
+{
+	struct udevice *dev;
+	ofnode node;
+	int ret;
+
+	dev_for_each_subnode(node, parent) {
+		struct led_uc_plat *uc_plat;
+		const char *label;
+
+		label = ofnode_read_string(node, "label");
+		if (!label)
+			label = ofnode_get_name(node);
+		ret = device_bind_driver_to_node(parent, "gpio_led",
+						 ofnode_get_name(node),
+						 node, &dev);
+		if (ret)
+			return ret;
+		uc_plat = dev_get_uclass_plat(dev);
+		uc_plat->label = label;
+	}
+
+	return 0;
+}
+
+static const struct led_ops gpio_led_ops = {
+	.set_state	= gpio_led_set_state,
+	.get_state	= gpio_led_get_state,
+};
+
+static const struct udevice_id led_gpio_ids[] = {
+	{ .compatible = "gpio-leds" },
+	{ }
+};
+
+U_BOOT_DRIVER(led_gpio) = {
+	.name	= "gpio_led",
+	.id	= UCLASS_LED,
+	.of_match = led_gpio_ids,
+	.ops	= &gpio_led_ops,
+	.priv_auto	= sizeof(struct led_gpio_priv),
+	.bind	= led_gpio_bind,
+	.probe	= led_gpio_probe,
+	.remove	= led_gpio_remove,
+};