From 395891b0e4c67591523dd0e2c2ac0c8aa22e88e7 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 18 Jan 2012 18:54:01 +0100
Subject: [PATCH] allow devices to be disabled through a config option

---
 device.c | 30 ++++++++++++++++++++++++++++--
 device.h |  4 ++++
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/device.c b/device.c
index 91cb37a..784905b 100644
--- a/device.c
+++ b/device.c
@@ -34,6 +34,7 @@ static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
 	[DEV_ATTR_MTU] = { "mtu", BLOBMSG_TYPE_INT32 },
 	[DEV_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
 	[DEV_ATTR_TXQUEUELEN] = { "txqueuelen", BLOBMSG_TYPE_INT32 },
+	[DEV_ATTR_ENABLED] = { "enabled", BLOBMSG_TYPE_BOOL },
 };
 
 const struct config_param_list device_attr_list = {
@@ -181,6 +182,10 @@ device_init_settings(struct device *dev, struct blob_attr **tb)
 	struct ether_addr *ea;
 
 	dev->flags = 0;
+	dev->disabled = false;
+
+	if ((cur = tb[DEV_ATTR_ENABLED]))
+		device_set_disabled(dev, !blobmsg_get_bool(cur));
 
 	if ((cur = tb[DEV_ATTR_MTU])) {
 		dev->mtu = blobmsg_get_u32(cur);
@@ -409,16 +414,37 @@ void device_cleanup(struct device *dev)
 	device_delete(dev);
 }
 
-void device_set_present(struct device *dev, bool state)
+static void __device_set_present(struct device *dev, bool state)
 {
 	if (dev->present == state)
 		return;
 
-	D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 	dev->present = state;
 	device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 }
 
+void device_set_present(struct device *dev, bool state)
+{
+	if (dev->sys_present == state)
+		return;
+
+	dev->sys_present = state;
+	D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
+
+	if (state && dev->disabled)
+		return;
+
+	__device_set_present(dev, state);
+}
+
+void
+device_set_disabled(struct device *dev, bool value)
+{
+	dev->disabled = value;
+	if (dev->sys_present)
+		__device_set_present(dev, !value);
+}
+
 void device_add_user(struct device_user *dep, struct device *dev)
 {
 	dep->dev = dev;
diff --git a/device.h b/device.h
index c0b112d..338138f 100644
--- a/device.h
+++ b/device.h
@@ -16,6 +16,7 @@ enum {
 	DEV_ATTR_MTU,
 	DEV_ATTR_MACADDR,
 	DEV_ATTR_TXQUEUELEN,
+	DEV_ATTR_ENABLED,
 	__DEV_ATTR_MAX,
 };
 
@@ -88,9 +89,11 @@ struct device {
 
 	struct blob_attr *config;
 	bool config_pending;
+	bool sys_present;
 	bool present;
 	int active;
 	bool external;
+	bool disabled;
 
 	bool current_config;
 	bool default_config;
@@ -143,6 +146,7 @@ void device_add_user(struct device_user *dep, struct device *iface);
 void device_remove_user(struct device_user *dep);
 
 void device_set_present(struct device *dev, bool state);
+void device_set_disabled(struct device *dev, bool value);
 int device_claim(struct device_user *dep);
 void device_release(struct device_user *dep);
 int device_check_state(struct device *dev);
-- 
2.30.2