[PATCH v3 5/9] led: implement LED activity API

[Christian Marangi]

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 are implemented similar to BOOT LED, LED_ACTIVITY_ENABLE to
enable support for it.

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

If "u-boot,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 at gmail.com>
---
 doc/device-tree-bindings/config.txt |  4 ++
 drivers/led/Kconfig                 | 21 ++++++++++
 include/led.h                       | 63 +++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+)

diff --git a/doc/device-tree-bindings/config.txt b/doc/device-tree-bindings/config.txt
index 68edd177040..cd9ec88909b 100644
--- a/doc/device-tree-bindings/config.txt
+++ b/doc/device-tree-bindings/config.txt
@@ -30,8 +30,12 @@ u-boot,boot-led (string)
 u-boot,error-led (string)
 	This is used to specify the label for an LED to indicate an error and
 	a successful boot, on supported hardware.
+u-boot,activity-led (string)
+	This is used to specify the label for an LED to indicate an activity
+	if supported by the operation.
 
 u-boot,boot-led-period (int)
+u-boot,activity-led-period (int)
 	This is used to specify the default period for an LED in blink mode.
 
 bootsecure (int)
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index fd9442edaf3..1336f943dab 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -29,6 +29,27 @@ config LED_BOOT_PERIOD
 	help
 	  LED boot blink period in ms.
 
+config LED_ACTIVITY_ENABLE
+	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_ACTIVITY_LABEL
+	string "LED activity label"
+	depends on LED_ACTIVITY_ENABLE
+	help
+	  LED label defined in DT to assign for LED activity usage.
+
+config LED_ACTIVITY_PERIOD
+	int "LED activity period"
+	depends on LED_ACTIVITY_ENABLE && (LED_BLINK || LED_SW_BLINK)
+	default 2
+	help
+	  LED activity blink period in ms.
+
 config LED_BCM6328
 	bool "LED Support for BCM6328"
 	depends on LED && ARCH_BMIPS
diff --git a/include/led.h b/include/led.h
index 2d3b89674e2..6a1471dae85 100644
--- a/include/led.h
+++ b/include/led.h
@@ -223,4 +223,67 @@ static inline int led_boot_blink(void)
 #endif
 #endif
 
+#ifdef CONFIG_LED_ACTIVITY_ENABLE
+
+/**
+ * led_activity_on() - turn ON the designated LED for activity
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static inline int led_activity_on(void)
+{
+	const char *led_name;
+
+	led_name = ofnode_conf_read_str("u-boot,activity-led");
+	if (!led_name)
+		return -ENOENT;
+
+	return led_set_state_by_label(led_name, LEDST_ON);
+}
+
+/**
+ * led_activity_off() - turn OFF the designated LED for activity
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static inline int led_activity_off(void)
+{
+	const char *led_name;
+
+	led_name = ofnode_conf_read_str("u-boot,activity-led");
+	if (!led_name)
+		return -ENOENT;
+
+	return led_set_state_by_label(led_name, LEDST_OFF);
+}
+
+#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
+ */
+static inline int led_activity_blink(void)
+{
+	const char *led_name;
+	int led_period, ret;
+
+	led_name = ofnode_conf_read_str("u-boot,activity-led");
+	if (!led_name)
+		return -ENOENT;
+
+	led_period = ofnode_conf_read_int("u-boot,activity-led-period", 250);
+
+	ret = led_set_period_by_label(led_name, led_period);
+	if (ret)
+		return ret;
+
+	return led_set_state_by_label(led_name, LEDST_BLINK);
+}
+#else
+/* If LED BLINK is not supported/enabled, fallback to LED ON */
+#define led_activity_blink led_activity_on
+#endif
+#endif
+
 #endif
-- 
2.45.2