5 files changed, 156 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 2651c8d8de2f..45f68eaf9b79 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -15,6 +15,19 @@ if PHYLIB
 config SWPHY
 	bool
 
+config LED_TRIGGER_PHY
+	bool "Support LED triggers for tracking link state"
+	depends on LEDS_TRIGGERS
+	---help---
+	  Adds support for a set of LED trigger events per-PHY.  Link
+	  state change will trigger the events, for consumption by an
+	  LED class driver.  There are triggers for each link speed currently
+	  supported by the phy, and are of the form:
+	       <mii bus id>:<phy>:<speed>
+
+	  Where speed is in the form:
+		<Speed in megabits>Mbps or <Speed in gigabits>Gbps
+
 comment "MDIO bus device drivers"
 
 config MDIO_BCM_IPROC
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index e58667d111e7..86d12cd3fbf0 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -2,6 +2,7 @@
 
 libphy-y			:= phy.o phy_device.o mdio_bus.o mdio_device.o
 libphy-$(CONFIG_SWPHY)		+= swphy.o
+libphy-$(CONFIG_LED_TRIGGER_PHY)	+= phy_led_triggers.o
 
 obj-$(CONFIG_PHYLIB)		+= libphy.o
 
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index ee3c793124c7..2f94c60d4939 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -946,6 +946,7 @@ EXPORT_SYMBOL(phy_start);
 static void phy_adjust_link(struct phy_device *phydev)
 {
 	phydev->adjust_link(phydev->attached_dev);
+	phy_led_trigger_change_speed(phydev);
 }
 
 /**
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index ac440a815353..49a1c988d29c 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -30,6 +30,7 @@
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/phy.h>
+#include <linux/phy_led_triggers.h>
 #include <linux/mdio.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
@@ -916,6 +917,8 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 	else
 		phy_resume(phydev);
 
+	phy_led_triggers_register(phydev);
+
 	return err;
 
 error:
@@ -989,6 +992,8 @@ void phy_detach(struct phy_device *phydev)
 		}
 	}
 
+	phy_led_triggers_unregister(phydev);
+
 	/*
 	 * The phydev might go away on the put_device() below, so avoid
 	 * a use-after-free bug by reading the underlying bus first.
diff --git a/drivers/net/phy/phy_led_triggers.c b/drivers/net/phy/phy_led_triggers.c
new file mode 100644
index 000000000000..cda600a1b766
--- /dev/null
+++ b/drivers/net/phy/phy_led_triggers.c
@@ -0,0 +1,136 @@
+/* Copyright (C) 2016 National Instruments Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+  * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/leds.h>
+#include <linux/phy.h>
+#include <linux/netdevice.h>
+
+static struct phy_led_trigger *phy_speed_to_led_trigger(struct phy_device *phy,
+							unsigned int speed)
+{
+	unsigned int i;
+
+	for (i = 0; i < phy->phy_num_led_triggers; i++) {
+		if (phy->phy_led_triggers[i].speed == speed)
+			return &phy->phy_led_triggers[i];
+	}
+	return NULL;
+}
+
+void phy_led_trigger_change_speed(struct phy_device *phy)
+{
+	struct phy_led_trigger *plt;
+
+	if (!phy->link)
+		goto out_change_speed;
+
+	if (phy->speed == 0)
+		return;
+
+	plt = phy_speed_to_led_trigger(phy, phy->speed);
+	if (!plt) {
+		netdev_alert(phy->attached_dev,
+			     "No phy led trigger registered for speed(%d)\n",
+			     phy->speed);
+		goto out_change_speed;
+	}
+
+	if (plt != phy->last_triggered) {
+		led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
+		led_trigger_event(&plt->trigger, LED_FULL);
+		phy->last_triggered = plt;
+	}
+	return;
+
+out_change_speed:
+	if (phy->last_triggered) {
+		led_trigger_event(&phy->last_triggered->trigger,
+				  LED_OFF);
+		phy->last_triggered = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(phy_led_trigger_change_speed);
+
+static int phy_led_trigger_register(struct phy_device *phy,
+				    struct phy_led_trigger *plt,
+				    unsigned int speed)
+{
+	char name_suffix[PHY_LED_TRIGGER_SPEED_SUFFIX_SIZE];
+
+	plt->speed = speed;
+
+	if (speed < SPEED_1000)
+		snprintf(name_suffix, sizeof(name_suffix), "%dMbps", speed);
+	else if (speed == SPEED_2500)
+		snprintf(name_suffix, sizeof(name_suffix), "2.5Gbps");
+	else
+		snprintf(name_suffix, sizeof(name_suffix), "%dGbps",
+			 DIV_ROUND_CLOSEST(speed, 1000));
+
+	snprintf(plt->name, sizeof(plt->name), PHY_ID_FMT ":%s",
+		 phy->mdio.bus->id, phy->mdio.addr, name_suffix);
+	plt->trigger.name = plt->name;
+
+	return led_trigger_register(&plt->trigger);
+}
+
+static void phy_led_trigger_unregister(struct phy_led_trigger *plt)
+{
+	led_trigger_unregister(&plt->trigger);
+}
+
+int phy_led_triggers_register(struct phy_device *phy)
+{
+	int i, err;
+	unsigned int speeds[50];
+
+	phy->phy_num_led_triggers = phy_supported_speeds(phy, speeds,
+							 ARRAY_SIZE(speeds));
+	if (!phy->phy_num_led_triggers)
+		return 0;
+
+	phy->phy_led_triggers = devm_kzalloc(&phy->mdio.dev,
+					    sizeof(struct phy_led_trigger) *
+						   phy->phy_num_led_triggers,
+					    GFP_KERNEL);
+	if (!phy->phy_led_triggers)
+		return -ENOMEM;
+
+	for (i = 0; i < phy->phy_num_led_triggers; i++) {
+		err = phy_led_trigger_register(phy, &phy->phy_led_triggers[i],
+					       speeds[i]);
+		if (err)
+			goto out_unreg;
+	}
+
+	phy->last_triggered = NULL;
+	phy_led_trigger_change_speed(phy);
+
+	return 0;
+out_unreg:
+	while (i--)
+		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
+	devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
+	return err;
+}
+EXPORT_SYMBOL_GPL(phy_led_triggers_register);
+
+void phy_led_triggers_unregister(struct phy_device *phy)
+{
+	int i;
+
+	for (i = 0; i < phy->phy_num_led_triggers; i++)
+		phy_led_trigger_unregister(&phy->phy_led_triggers[i]);
+
+	devm_kfree(&phy->mdio.dev, phy->phy_led_triggers);
+}
+EXPORT_SYMBOL_GPL(phy_led_triggers_unregister);