[PATCH v4 05/11] led: implement LED activity API

[Christian Marangi <ansuelsmth@gmail.com>]

Implement LED activity API similar to BOOT LED API.

Usual activity might be a file transfer with TFTP, a flash write...

User of this API will call led_activity_on/off/blink() to signal these
kind of activity.

New Kconfig is implemented similar to BOOT LED, LED_ACTIVITY to
enable support for it.

It's introduced a new /options/u-boot property "activity-led" and
"activity-led-period" to define the activity LED label and the
default period when the activity LED is set to blink mode.

If "activity-led-period" is not defined, the value of 250 (ms) is
used by default.

If CONFIG_LED_BLINK or CONFIG_LED_SW_BLINK is not enabled,
led_boot_blink call will fallback to simple LED ON.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/led/Kconfig      |  8 ++++
 drivers/led/led-uclass.c | 94 ++++++++++++++++++++++++++++++++++++++--
 include/led.h            | 52 ++++++++++++++++++++++
 3 files changed, 151 insertions(+), 3 deletions(-)

diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 6149cfa02b8..f0434f247a4 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -16,6 +16,14 @@ config LED_BOOT
 
 	  LED boot is a specific LED assigned to signal boot operation status.
 
+config LED_ACTIVITY
+	bool "Enable LED activity support"
+	help
+	  Enable LED activity support.
+
+	  LED activity is a specific LED assigned to signal activity operation
+	  like file trasnfer, flash write/erase...
+
 config LED_BCM6328
 	bool "LED Support for BCM6328"
 	depends on LED && ARCH_BMIPS
diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c
index c5b560982b0..c87fc7540c7 100644
--- a/drivers/led/led-uclass.c
+++ b/drivers/led/led-uclass.c
@@ -168,12 +168,86 @@ int led_boot_blink(void)
 #endif
 #endif
 
+#ifdef CONFIG_LED_ACTIVITY
+int led_activity_on(void)
+{
+	struct uclass *uc = uclass_find(UCLASS_LED);
+	struct led_uc_priv *priv;
+	struct udevice *dev;
+
+	if (!uc)
+		return -ENOENT;
+
+	priv = uclass_get_priv(uc);
+	if (!priv->activity_led_dev ||
+	    uclass_get_device_tail(priv->activity_led_dev, 0, &dev)) {
+		printf("Failed to get activity LED %s\n",
+		       priv->activity_led_label);
+		return -EINVAL;
+	}
+
+	return led_set_state(dev, LEDST_ON);
+}
+
+int led_activity_off(void)
+{
+	struct uclass *uc = uclass_find(UCLASS_LED);
+	struct led_uc_priv *priv;
+	struct udevice *dev;
+
+	if (!uc)
+		return -ENOENT;
+
+	priv = uclass_get_priv(uc);
+	if (!priv->activity_led_dev ||
+	    uclass_get_device_tail(priv->activity_led_dev, 0, &dev)) {
+		printf("Failed to get activity LED %s\n",
+		       priv->activity_led_label);
+		return -EINVAL;
+	}
+
+	return led_set_state(dev, LEDST_OFF);
+}
+
+#if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK)
+int led_activity_blink(void)
+{
+	struct uclass *uc = uclass_find(UCLASS_LED);
+	struct led_uc_priv *priv;
+	struct udevice *dev;
+	int ret;
+
+	if (!uc)
+		return -ENOENT;
+
+	priv = uclass_get_priv(uc);
+	if (!priv->activity_led_dev ||
+	    uclass_get_device_tail(priv->activity_led_dev, 0, &dev)) {
+		printf("Failed to get activity LED %s\n",
+		       priv->activity_led_label);
+		return -EINVAL;
+	}
+
+	ret = led_set_period(dev, priv->activity_led_period);
+	if (ret) {
+		if (ret != -ENOSYS)
+			return ret;
+
+		/* fallback to ON with no set_period and no SW_BLINK */
+		return led_set_state(dev, LEDST_ON);
+	}
+
+	return led_set_state(dev, LEDST_BLINK);
+}
+#endif
+#endif
+
 static int led_post_bind(struct udevice *dev)
 {
 	struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
 	const char *default_state;
 
-#ifdef CONFIG_LED_BOOT
+#if defined(CONFIG_LED_BOOT) || defined(CONFIG_LED_ACTIVITY)
 	struct led_uc_priv *priv = uclass_get_priv(dev->uclass);
 #endif
 
@@ -189,6 +263,12 @@ static int led_post_bind(struct udevice *dev)
 		priv->boot_led_dev = dev;
 #endif
 
+#ifdef CONFIG_LED_ACTIVITY
+	/* check if we are binding activity LED and assign it */
+	if (!strcmp(priv->activity_led_label, uc_plat->label))
+		priv->activity_led_dev = dev;
+#endif
+
 	uc_plat->default_state = LEDST_COUNT;
 
 	default_state = dev_read_string(dev, "default-state");
@@ -242,13 +322,21 @@ static int led_post_probe(struct udevice *dev)
 	return ret;
 }
 
-#ifdef CONFIG_LED_BOOT
+#if defined(CONFIG_LED_BOOT) || defined(CONFIG_LED_ACTIVITY)
 static int led_init(struct uclass *uc)
 {
 	struct led_uc_priv *priv = uclass_get_priv(uc);
 
+#ifdef CONFIG_LED_BOOT
 	priv->boot_led_label = ofnode_options_read_str("boot-led");
 	priv->boot_led_period = ofnode_options_read_int("boot-led-period", 250);
+#endif
+
+#ifdef CONFIG_LED_ACTIVITY
+	priv->activity_led_label = ofnode_options_read_str("activity-led");
+	priv->activity_led_period = ofnode_options_read_int("activity-led-period",
+							    250);
+#endif
 
 	return 0;
 }
@@ -260,7 +348,7 @@ UCLASS_DRIVER(led) = {
 	.per_device_plat_auto	= sizeof(struct led_uc_plat),
 	.post_bind	= led_post_bind,
 	.post_probe	= led_post_probe,
-#ifdef CONFIG_LED_BOOT
+#if defined(CONFIG_LED_BOOT) || defined(CONFIG_LED_ACTIVITY)
 	.init		= led_init,
 	.priv_auto	= sizeof(struct led_uc_priv),
 #endif
diff --git a/include/led.h b/include/led.h
index ca495217777..bba8c0009ca 100644
--- a/include/led.h
+++ b/include/led.h
@@ -54,8 +54,11 @@ struct led_uc_plat {
  * struct led_uc_priv - Private data the uclass stores about each device
  *
  * @boot_led_label:	Boot LED label
+ * @activity_led_label:	Activity LED label
  * @boot_led_dev:	Boot LED dev
+ * @activity_led_dev:	Activity LED dev
  * @boot_led_period:	Boot LED blink period
+ * @activity_led_period: Activity LED blink period
  */
 struct led_uc_priv {
 #ifdef CONFIG_LED_BOOT
@@ -63,6 +66,11 @@ struct led_uc_priv {
 	struct udevice *boot_led_dev;
 	int boot_led_period;
 #endif
+#ifdef CONFIG_LED_ACTIVITY
+	const char *activity_led_label;
+	struct udevice *activity_led_dev;
+	int activity_led_period;
+#endif
 };
 
 struct led_ops {
@@ -193,4 +201,48 @@ static inline int led_boot_blink(void)
 }
 #endif
 
+#ifdef CONFIG_LED_ACTIVITY
+
+/**
+ * led_activity_on() - turn ON the designated LED for activity
+ *
+ * Return: 0 if OK, -ve on error
+ */
+int led_activity_on(void);
+
+/**
+ * led_activity_off() - turn OFF the designated LED for activity
+ *
+ * Return: 0 if OK, -ve on error
+ */
+int led_activity_off(void);
+
+#if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK)
+/**
+ * led_activity_blink() - turn ON the designated LED for activity
+ *
+ * Return: 0 if OK, -ve on error
+ */
+int led_activity_blink(void);
+#else
+/* If LED BLINK is not supported/enabled, fallback to LED ON */
+#define led_activity_blink led_activity_on
+#endif
+#else
+static inline int led_activity_on(void)
+{
+	return -ENOSYS;
+}
+
+static inline int led_activity_off(void)
+{
+	return -ENOSYS;
+}
+
+static inline int led_activity_blink(void)
+{
+	return -ENOSYS;
+}
+#endif
+
 #endif
-- 
2.45.2