forked from luck/tmp_suning_uos_patched
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>
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Documentation/ABI/stable/thermal-notification
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Documentation/ABI/stable/thermal-notification
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@ -0,0 +1,4 @@
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What: A notification mechanism for thermal related events
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Description:
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This interface enables notification for thermal related events.
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The notification is in the form of a netlink event.
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@ -278,3 +278,15 @@ method, the sys I/F structure will be built like this:
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|---name: acpitz
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|---temp1_input: 37000
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|---temp1_crit: 100000
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4. Event Notification
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The framework includes a simple notification mechanism, in the form of a
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netlink event. Netlink socket initialization is done during the _init_
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of the framework. Drivers which intend to use the notification mechanism
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just need to call generate_netlink_event() with two arguments viz
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(originator, event). Typically the originator will be an integer assigned
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to a thermal_zone_device when it registers itself with the framework. The
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event will be one of:{THERMAL_AUX0, THERMAL_AUX1, THERMAL_CRITICAL,
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THERMAL_DEV_FAULT}. Notification can be sent when the current temperature
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crosses any of the configured thresholds.
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@ -4,6 +4,7 @@
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menuconfig THERMAL
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tristate "Generic Thermal sysfs driver"
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depends on NET
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help
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Generic Thermal Sysfs driver offers a generic mechanism for
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thermal management. Usually it's made up of one or more thermal
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@ -32,6 +32,8 @@
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#include <linux/thermal.h>
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#include <linux/spinlock.h>
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#include <linux/reboot.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
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@ -58,6 +60,22 @@ static LIST_HEAD(thermal_tz_list);
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static LIST_HEAD(thermal_cdev_list);
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static DEFINE_MUTEX(thermal_list_lock);
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static unsigned int thermal_event_seqnum;
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static struct genl_family thermal_event_genl_family = {
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.id = GENL_ID_GENERATE,
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.name = THERMAL_GENL_FAMILY_NAME,
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.version = THERMAL_GENL_VERSION,
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.maxattr = THERMAL_GENL_ATTR_MAX,
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};
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static struct genl_multicast_group thermal_event_mcgrp = {
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.name = THERMAL_GENL_MCAST_GROUP_NAME,
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};
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static int genetlink_init(void);
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static void genetlink_exit(void);
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static int get_idr(struct idr *idr, struct mutex *lock, int *id)
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{
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int err;
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@ -1214,6 +1232,82 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
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EXPORT_SYMBOL(thermal_zone_device_unregister);
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int generate_netlink_event(u32 orig, enum events event)
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{
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struct sk_buff *skb;
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struct nlattr *attr;
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struct thermal_genl_event *thermal_event;
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void *msg_header;
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int size;
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int result;
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/* allocate memory */
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size = nla_total_size(sizeof(struct thermal_genl_event)) + \
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nla_total_size(0);
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skb = genlmsg_new(size, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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/* add the genetlink message header */
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msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
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&thermal_event_genl_family, 0,
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THERMAL_GENL_CMD_EVENT);
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if (!msg_header) {
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nlmsg_free(skb);
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return -ENOMEM;
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}
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/* fill the data */
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attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
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sizeof(struct thermal_genl_event));
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if (!attr) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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thermal_event = nla_data(attr);
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if (!thermal_event) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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memset(thermal_event, 0, sizeof(struct thermal_genl_event));
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thermal_event->orig = orig;
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thermal_event->event = event;
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/* send multicast genetlink message */
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result = genlmsg_end(skb, msg_header);
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if (result < 0) {
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nlmsg_free(skb);
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return result;
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}
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result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
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if (result)
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printk(KERN_INFO "failed to send netlink event:%d", result);
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return result;
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}
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EXPORT_SYMBOL(generate_netlink_event);
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static int genetlink_init(void)
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{
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int result;
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result = genl_register_family(&thermal_event_genl_family);
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if (result)
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return result;
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result = genl_register_mc_group(&thermal_event_genl_family,
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&thermal_event_mcgrp);
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if (result)
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genl_unregister_family(&thermal_event_genl_family);
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return result;
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}
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static int __init thermal_init(void)
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{
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int result = 0;
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@ -1225,9 +1319,15 @@ static int __init thermal_init(void)
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mutex_destroy(&thermal_idr_lock);
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mutex_destroy(&thermal_list_lock);
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}
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result = genetlink_init();
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return result;
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}
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static void genetlink_exit(void)
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{
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genl_unregister_family(&thermal_event_genl_family);
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}
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static void __exit thermal_exit(void)
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{
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class_unregister(&thermal_class);
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@ -1235,7 +1335,8 @@ static void __exit thermal_exit(void)
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idr_destroy(&thermal_cdev_idr);
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mutex_destroy(&thermal_idr_lock);
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mutex_destroy(&thermal_list_lock);
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genetlink_exit();
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}
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subsys_initcall(thermal_init);
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fs_initcall(thermal_init);
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module_exit(thermal_exit);
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@ -127,6 +127,37 @@ struct thermal_zone_device {
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struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
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#endif
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};
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/* Adding event notification support elements */
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#define THERMAL_GENL_FAMILY_NAME "thermal_event"
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#define THERMAL_GENL_VERSION 0x01
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#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
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enum events {
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THERMAL_AUX0,
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THERMAL_AUX1,
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THERMAL_CRITICAL,
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THERMAL_DEV_FAULT,
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};
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struct thermal_genl_event {
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u32 orig;
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enum events event;
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};
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/* attributes of thermal_genl_family */
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enum {
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THERMAL_GENL_ATTR_UNSPEC,
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THERMAL_GENL_ATTR_EVENT,
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__THERMAL_GENL_ATTR_MAX,
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};
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#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
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/* commands supported by the thermal_genl_family */
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enum {
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THERMAL_GENL_CMD_UNSPEC,
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THERMAL_GENL_CMD_EVENT,
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__THERMAL_GENL_CMD_MAX,
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};
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#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
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struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
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struct
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@ -146,5 +177,6 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
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thermal_cooling_device_ops
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*);
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void thermal_cooling_device_unregister(struct thermal_cooling_device *);
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extern int generate_netlink_event(u32 orig, enum events event);
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#endif /* __THERMAL_H__ */
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