kernel: swconfig: introduce a generic switch LED trigger

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29627 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 367 insertions, 0 deletions

diff --git a/target/linux/generic/files/drivers/net/phy/swconfig.c b/target/linux/generic/files/drivers/net/phy/swconfig.c
index 2038330ba2..1f4491ac51 100644
--- a/target/linux/generic/files/drivers/net/phy/swconfig.c
+++ b/target/linux/generic/files/drivers/net/phy/swconfig.c
@@ -33,6 +33,8 @@
 
 #define SWCONFIG_DEVNAME	"switch%d"
 
+#include "swconfig_leds.c"
+
 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
 MODULE_LICENSE("GPL");
 
@@ -863,6 +865,7 @@ register_switch(struct switch_dev *dev, struct net_device *netdev)
 	struct switch_dev *sdev;
 	const int max_switches = 8 * sizeof(unsigned long);
 	unsigned long in_use = 0;
+	int err;
 	int i;
 
 	INIT_LIST_HEAD(&dev->dev_list);
@@ -905,6 +908,10 @@ register_switch(struct switch_dev *dev, struct net_device *netdev)
 	list_add(&dev->dev_list, &swdevs);
 	swconfig_unlock();
 
+	err = swconfig_create_led_trigger(dev);
+	if (err)
+		return err;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(register_switch);
@@ -912,6 +919,7 @@ EXPORT_SYMBOL_GPL(register_switch);
 void
 unregister_switch(struct switch_dev *dev)
 {
+	swconfig_destroy_led_trigger(dev);
 	kfree(dev->portbuf);
 	spin_lock(&dev->lock);
 	swconfig_lock();
diff --git a/target/linux/generic/files/drivers/net/phy/swconfig_leds.c b/target/linux/generic/files/drivers/net/phy/swconfig_leds.c
new file mode 100644
index 0000000000..6f54cc15b7
--- /dev/null
+++ b/target/linux/generic/files/drivers/net/phy/swconfig_leds.c
@@ -0,0 +1,354 @@
+/*
+ * swconfig_led.c: LED trigger support for the switch configuration API
+ *
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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.
+ *
+ */
+
+#ifdef CONFIG_SWCONFIG_LEDS
+
+#include <linux/leds.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+
+#define SWCONFIG_LED_TIMER_INTERVAL	(HZ / 10)
+#define SWCONFIG_LED_NUM_PORTS		32
+
+struct switch_led_trigger {
+	struct led_trigger trig;
+	struct switch_dev *swdev;
+
+	struct delayed_work sw_led_work;
+	u32 port_mask;
+	u32 port_link;
+	unsigned long port_traffic[SWCONFIG_LED_NUM_PORTS];
+};
+
+struct swconfig_trig_data {
+	struct led_classdev *led_cdev;
+	struct switch_dev *swdev;
+
+	rwlock_t lock;
+	u32 port_mask;
+
+	bool prev_link;
+	unsigned long prev_traffic;
+	enum led_brightness prev_brightness;
+};
+
+static void
+swconfig_trig_set_brightness(struct swconfig_trig_data *trig_data,
+			     enum led_brightness brightness)
+{
+	led_brightness_set(trig_data->led_cdev, brightness);
+	trig_data->prev_brightness = brightness;
+}
+
+static void
+swconfig_trig_update_port_mask(struct led_trigger *trigger)
+{
+	struct list_head *entry;
+	struct switch_led_trigger *sw_trig;
+	u32 port_mask;
+
+	if (!trigger)
+		return;
+
+	sw_trig = (void *) trigger;
+
+	port_mask = 0;
+	read_lock(&trigger->leddev_list_lock);
+	list_for_each(entry, &trigger->led_cdevs) {
+		struct led_classdev *led_cdev;
+		struct swconfig_trig_data *trig_data;
+
+		led_cdev = list_entry(entry, struct led_classdev, trig_list);
+		trig_data = led_cdev->trigger_data;
+		if (trig_data) {
+			read_lock(&trig_data->lock);
+			port_mask |= trig_data->port_mask;
+			read_unlock(&trig_data->lock);
+		}
+	}
+	read_unlock(&trigger->leddev_list_lock);
+
+	sw_trig->port_mask = port_mask;
+
+	if (port_mask)
+		schedule_delayed_work(&sw_trig->sw_led_work,
+				      SWCONFIG_LED_TIMER_INTERVAL);
+	else
+		cancel_delayed_work_sync(&sw_trig->sw_led_work);
+}
+
+static ssize_t
+swconfig_trig_port_mask_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
+	unsigned long port_mask;
+	ssize_t ret = -EINVAL;
+	char *after;
+	size_t count;
+
+	port_mask = simple_strtoul(buf, &after, 16);
+	count =	after - buf;
+
+	if (*after && isspace(*after))
+		count++;
+
+	if (count == size) {
+		bool changed;
+
+		write_lock(&trig_data->lock);
+
+		changed = (trig_data->port_mask != port_mask);
+		if (changed) {
+			trig_data->port_mask = port_mask;
+			if (port_mask == 0)
+				swconfig_trig_set_brightness(trig_data, LED_OFF);
+		}
+
+		write_unlock(&trig_data->lock);
+
+		if (changed)
+			swconfig_trig_update_port_mask(led_cdev->trigger);
+
+		ret = count;
+	}
+
+	return ret;
+}
+
+static ssize_t
+swconfig_trig_port_mask_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
+
+	read_lock(&trig_data->lock);
+	sprintf(buf, "%#x\n", trig_data->port_mask);
+	read_unlock(&trig_data->lock);
+
+	return strlen(buf) + 1;
+}
+
+static DEVICE_ATTR(port_mask, 0644, swconfig_trig_port_mask_show,
+		   swconfig_trig_port_mask_store);
+
+static void
+swconfig_trig_activate(struct led_classdev *led_cdev)
+{
+	struct switch_led_trigger *sw_trig;
+	struct swconfig_trig_data *trig_data;
+	int err;
+
+	if (led_cdev->trigger->activate != swconfig_trig_activate)
+		return;
+
+	trig_data = kzalloc(sizeof(struct swconfig_trig_data), GFP_KERNEL);
+	if (!trig_data)
+		return;
+
+	sw_trig = (void *) led_cdev->trigger;
+
+	rwlock_init(&trig_data->lock);
+	trig_data->led_cdev = led_cdev;
+	trig_data->swdev = sw_trig->swdev;
+	led_cdev->trigger_data = trig_data;
+
+	err = device_create_file(led_cdev->dev, &dev_attr_port_mask);
+	if (err)
+		goto err_free;
+
+	return;
+
+err_free:
+	led_cdev->trigger_data = NULL;
+	kfree(trig_data);
+}
+
+static void
+swconfig_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct swconfig_trig_data *trig_data;
+
+	swconfig_trig_update_port_mask(led_cdev->trigger);
+
+	trig_data = (void *) led_cdev->trigger_data;
+	if (trig_data) {
+		device_remove_file(led_cdev->dev, &dev_attr_port_mask);
+		kfree(trig_data);
+	}
+}
+
+static void
+swconfig_trig_led_event(struct switch_led_trigger *sw_trig,
+			struct led_classdev *led_cdev)
+{
+	struct swconfig_trig_data *trig_data;
+	u32 port_mask;
+	bool link;
+
+	trig_data = led_cdev->trigger_data;
+	if (!trig_data)
+		return;
+
+	read_lock(&trig_data->lock);
+	port_mask = trig_data->port_mask;
+	read_unlock(&trig_data->lock);
+
+	link = !!(sw_trig->port_link & port_mask);
+	if (!link) {
+		if (link != trig_data->prev_link)
+			led_brightness_set(trig_data->led_cdev, LED_OFF);
+	} else {
+		unsigned long traffic;
+		int i;
+
+		traffic = 0;
+		for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
+			if (port_mask & (1 << i))
+				traffic += sw_trig->port_traffic[i];
+		}
+
+		if (trig_data->prev_brightness != LED_FULL)
+			swconfig_trig_set_brightness(trig_data, LED_FULL);
+		else if (traffic != trig_data->prev_traffic)
+			swconfig_trig_set_brightness(trig_data, LED_OFF);
+
+		trig_data->prev_traffic = traffic;
+	}
+
+	trig_data->prev_link = link;
+}
+
+static void
+swconfig_trig_update_leds(struct switch_led_trigger *sw_trig)
+{
+	struct list_head *entry;
+	struct led_trigger *trigger;
+
+	trigger = &sw_trig->trig;
+	read_lock(&trigger->leddev_list_lock);
+	list_for_each(entry, &trigger->led_cdevs) {
+		struct led_classdev *led_cdev;
+
+		led_cdev = list_entry(entry, struct led_classdev, trig_list);
+		swconfig_trig_led_event(sw_trig, led_cdev);
+	}
+	read_unlock(&trigger->leddev_list_lock);
+}
+
+static void
+swconfig_led_work_func(struct work_struct *work)
+{
+	struct switch_led_trigger *sw_trig;
+	struct switch_dev *swdev;
+	u32 port_mask;
+	u32 link;
+	int i;
+
+	sw_trig = container_of(work, struct switch_led_trigger,
+			       sw_led_work.work);
+
+	port_mask = sw_trig->port_mask;
+	swdev = sw_trig->swdev;
+
+	link = 0;
+	for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
+		u32 port_bit;
+
+		port_bit = BIT(i);
+		if ((port_mask & port_bit) == 0)
+			continue;
+
+		if (swdev->ops->get_port_link) {
+			struct switch_port_link port_link;
+
+			memset(&port_link, '\0', sizeof(port_link));
+			swdev->ops->get_port_link(swdev, i, &port_link);
+
+			if (port_link.link)
+				link |= port_bit;
+		}
+
+		if (swdev->ops->get_port_stats) {
+			struct switch_port_stats port_stats;
+
+			memset(&port_stats, '\0', sizeof(port_stats));
+			swdev->ops->get_port_stats(swdev, i, &port_stats);
+			sw_trig->port_traffic[i] = port_stats.tx_bytes +
+						   port_stats.rx_bytes;
+		}
+	}
+
+	sw_trig->port_link = link;
+
+	swconfig_trig_update_leds(sw_trig);
+
+	schedule_delayed_work(&sw_trig->sw_led_work,
+			      SWCONFIG_LED_TIMER_INTERVAL);
+}
+
+static int
+swconfig_create_led_trigger(struct switch_dev *swdev)
+{
+	struct switch_led_trigger *sw_trig;
+	int err;
+
+	if (!swdev->ops->get_port_link)
+		return 0;
+
+	sw_trig = kzalloc(sizeof(struct switch_led_trigger), GFP_KERNEL);
+	if (!sw_trig)
+		return -ENOMEM;
+
+	sw_trig->swdev = swdev;
+	sw_trig->trig.name = swdev->devname;
+	sw_trig->trig.activate = swconfig_trig_activate;
+	sw_trig->trig.deactivate = swconfig_trig_deactivate;
+
+	INIT_DELAYED_WORK(&sw_trig->sw_led_work, swconfig_led_work_func);
+
+	err = led_trigger_register(&sw_trig->trig);
+	if (err)
+		goto err_free;
+
+	swdev->led_trigger = sw_trig;
+
+	return 0;
+
+err_free:
+	kfree(sw_trig);
+	return err;
+}
+
+static void
+swconfig_destroy_led_trigger(struct switch_dev *swdev)
+{
+	struct switch_led_trigger *sw_trig;
+
+	sw_trig = swdev->led_trigger;
+	if (sw_trig) {
+		cancel_delayed_work_sync(&sw_trig->sw_led_work);
+		led_trigger_unregister(&sw_trig->trig);
+		kfree(sw_trig);
+	}
+}
+
+#else /* SWCONFIG_LEDS */
+static inline int
+swconfig_create_led_trigger(struct switch_dev *swdev) { return 0; }
+
+static inline void
+swconfig_destroy_led_trigger(struct switch_dev *swdev) { }
+#endif /* CONFIG_SWCONFIG_LEDS */
diff --git a/target/linux/generic/files/include/linux/switch.h b/target/linux/generic/files/include/linux/switch.h
index 04371ae741..ba1de9b18b 100644
--- a/target/linux/generic/files/include/linux/switch.h
+++ b/target/linux/generic/files/include/linux/switch.h
@@ -99,6 +99,7 @@ struct switch_op;
 struct switch_val;
 struct switch_attr;
 struct switch_attrlist;
+struct switch_led_trigger;
 
 int register_switch(struct switch_dev *dev, struct net_device *netdev);
 void unregister_switch(struct switch_dev *dev);
@@ -192,6 +193,10 @@ struct switch_dev {
 
 	spinlock_t lock;
 	struct switch_port *portbuf;
+
+#ifdef CONFIG_SWCONFIG_LEDS
+	struct switch_led_trigger *led_trigger;
+#endif
 };
 
 struct switch_port {