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authorSimon Glass <sjg@chromium.org>2015-06-23 15:38:46 -0600
committerSimon Glass <sjg@chromium.org>2015-07-21 17:39:24 -0600
commit5ac76bad2277ed40f2a2112ffab0f156e3b599fb (patch)
tree83369bd34bf572f1df277e04e8772e8829a917b6 /drivers/led
parent5917112c9e9f7a60062c604b3224bd5713c41f46 (diff)
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dm: led: Add a driver for GPIO-controlled LEDs
Add a simple driver which allows use of LEDs attached to GPIOs. The linux device tree binding is used. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/led')
-rw-r--r--drivers/led/Kconfig9
-rw-r--r--drivers/led/Makefile1
-rw-r--r--drivers/led/led_gpio.c101
3 files changed, 111 insertions, 0 deletions
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index e4d9a84..de5feea 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -15,3 +15,12 @@ config SPL_LED_SUPPORT
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.
+
+config LED_GPIO
+ bool "LED support for GPIO-connected LEDs"
+ depends on LED && DM_GPIO
+ help
+ Enable support for LEDs which are connected to GPIO lines. These
+ GPIOs may be on the SoC or some other device which provides GPIOs.
+ The GPIO driver must used driver model. LEDs are configured using
+ the device tree.
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
index b39b205..990129e 100644
--- a/drivers/led/Makefile
+++ b/drivers/led/Makefile
@@ -6,3 +6,4 @@
#
obj-$(CONFIG_LED) += led-uclass.o
+obj-$(CONFIG_LED_GPIO) += led_gpio.o
diff --git a/drivers/led/led_gpio.c b/drivers/led/led_gpio.c
new file mode 100644
index 0000000..a4cd618
--- /dev/null
+++ b/drivers/led/led_gpio.c
@@ -0,0 +1,101 @@
+/*
+ * 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 <asm/gpio.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct led_gpio_priv {
+ struct gpio_desc gpio;
+};
+
+static int gpio_led_set_on(struct udevice *dev, int on)
+{
+ struct led_gpio_priv *priv = dev_get_priv(dev);
+
+ if (!dm_gpio_is_valid(&priv->gpio))
+ return -EREMOTEIO;
+
+ return dm_gpio_set_value(&priv->gpio, on);
+}
+
+static int led_gpio_probe(struct udevice *dev)
+{
+ struct led_uclass_plat *uc_plat = dev_get_uclass_platdata(dev);
+ struct led_gpio_priv *priv = dev_get_priv(dev);
+
+ /* Ignore the top-level LED node */
+ if (!uc_plat->label)
+ return 0;
+ return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
+}
+
+static int led_gpio_remove(struct udevice *dev)
+{
+ struct led_gpio_priv *priv = dev_get_priv(dev);
+
+ if (dm_gpio_is_valid(&priv->gpio))
+ dm_gpio_free(dev, &priv->gpio);
+
+ return 0;
+}
+
+static int led_gpio_bind(struct udevice *parent)
+{
+ const void *blob = gd->fdt_blob;
+ struct udevice *dev;
+ int node;
+ int ret;
+
+ for (node = fdt_first_subnode(blob, parent->of_offset);
+ node > 0;
+ node = fdt_next_subnode(blob, node)) {
+ struct led_uclass_plat *uc_plat;
+ const char *label;
+
+ label = fdt_getprop(blob, node, "label", NULL);
+ if (!label) {
+ debug("%s: node %s has no label\n", __func__,
+ fdt_get_name(blob, node, NULL));
+ return -EINVAL;
+ }
+ ret = device_bind_driver_to_node(parent, "gpio_led",
+ fdt_get_name(blob, node, NULL),
+ node, &dev);
+ if (ret)
+ return ret;
+ uc_plat = dev_get_uclass_platdata(dev);
+ uc_plat->label = label;
+ }
+
+ return 0;
+}
+
+static const struct led_ops gpio_led_ops = {
+ .set_on = gpio_led_set_on,
+};
+
+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_alloc_size = sizeof(struct led_gpio_priv),
+ .bind = led_gpio_bind,
+ .probe = led_gpio_probe,
+ .remove = led_gpio_remove,
+};