thermal: Add event notification to thermal framework

This patch adds event notification support to the generic
thermal sysfs framework in the kernel. The notification is in the
form of a netlink event.

Signed-off-by: R.Durgadoss <durgadoss.r@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/thermal/thermal_sys.c

@@ -32,6 +32,8 @@
 #include <linux/thermal.h>
 #include <linux/spinlock.h>
 #include <linux/reboot.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
 
 MODULE_AUTHOR("Zhang Rui");
 MODULE_DESCRIPTION("Generic thermal management sysfs support");
@@ -58,6 +60,22 @@ static LIST_HEAD(thermal_tz_list);
 static LIST_HEAD(thermal_cdev_list);
 static DEFINE_MUTEX(thermal_list_lock);
 
+static unsigned int thermal_event_seqnum;
+
+static struct genl_family thermal_event_genl_family = {
+	.id = GENL_ID_GENERATE,
+	.name = THERMAL_GENL_FAMILY_NAME,
+	.version = THERMAL_GENL_VERSION,
+	.maxattr = THERMAL_GENL_ATTR_MAX,
+};
+
+static struct genl_multicast_group thermal_event_mcgrp = {
+	.name = THERMAL_GENL_MCAST_GROUP_NAME,
+};
+
+static int genetlink_init(void);
+static void genetlink_exit(void);
+
 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 {
 	int err;
@@ -1214,6 +1232,82 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 
 EXPORT_SYMBOL(thermal_zone_device_unregister);
 
+int generate_netlink_event(u32 orig, enum events event)
+{
+	struct sk_buff *skb;
+	struct nlattr *attr;
+	struct thermal_genl_event *thermal_event;
+	void *msg_header;
+	int size;
+	int result;
+
+	/* allocate memory */
+	size = nla_total_size(sizeof(struct thermal_genl_event)) + \
+				nla_total_size(0);
+
+	skb = genlmsg_new(size, GFP_ATOMIC);
+	if (!skb)
+		return -ENOMEM;
+
+	/* add the genetlink message header */
+	msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
+				 &thermal_event_genl_family, 0,
+				 THERMAL_GENL_CMD_EVENT);
+	if (!msg_header) {
+		nlmsg_free(skb);
+		return -ENOMEM;
+	}
+
+	/* fill the data */
+	attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
+			sizeof(struct thermal_genl_event));
+
+	if (!attr) {
+		nlmsg_free(skb);
+		return -EINVAL;
+	}
+
+	thermal_event = nla_data(attr);
+	if (!thermal_event) {
+		nlmsg_free(skb);
+		return -EINVAL;
+	}
+
+	memset(thermal_event, 0, sizeof(struct thermal_genl_event));
+
+	thermal_event->orig = orig;
+	thermal_event->event = event;
+
+	/* send multicast genetlink message */
+	result = genlmsg_end(skb, msg_header);
+	if (result < 0) {
+		nlmsg_free(skb);
+		return result;
+	}
+
+	result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
+	if (result)
+		printk(KERN_INFO "failed to send netlink event:%d", result);
+
+	return result;
+}
+EXPORT_SYMBOL(generate_netlink_event);
+
+static int genetlink_init(void)
+{
+	int result;
+
+	result = genl_register_family(&thermal_event_genl_family);
+	if (result)
+		return result;
+
+	result = genl_register_mc_group(&thermal_event_genl_family,
+					&thermal_event_mcgrp);
+	if (result)
+		genl_unregister_family(&thermal_event_genl_family);
+	return result;
+}
+
 static int __init thermal_init(void)
 {
 	int result = 0;
@@ -1225,9 +1319,15 @@ static int __init thermal_init(void)
 		mutex_destroy(&thermal_idr_lock);
 		mutex_destroy(&thermal_list_lock);
 	}
+	result = genetlink_init();
 	return result;
 }
 
+static void genetlink_exit(void)
+{
+	genl_unregister_family(&thermal_event_genl_family);
+}
+
 static void __exit thermal_exit(void)
 {
 	class_unregister(&thermal_class);
@@ -1235,7 +1335,8 @@ static void __exit thermal_exit(void)
 	idr_destroy(&thermal_cdev_idr);
 	mutex_destroy(&thermal_idr_lock);
 	mutex_destroy(&thermal_list_lock);
+	genetlink_exit();
 }
 
-subsys_initcall(thermal_init);
+fs_initcall(thermal_init);
 module_exit(thermal_exit);