Commit f96c8e50 authored by Amit Kucheria's avatar Amit Kucheria Committed by Daniel Lezcano

thermal: Remove netlink support

There are no users of netlink messages for thermal inside the kernel.
Remove the code and adjust the documentation.
Signed-off-by: default avatarAmit Kucheria <amit.kucheria@linaro.org>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/8ff02cf62186c7a54fff325fad40a2e9ca3affa6.1571656014.git.amit.kucheria@linaro.org
parent da73f9b8
...@@ -725,24 +725,10 @@ method, the sys I/F structure will be built like this:: ...@@ -725,24 +725,10 @@ method, the sys I/F structure will be built like this::
|---temp1_input: 37000 |---temp1_input: 37000
|---temp1_crit: 100000 |---temp1_crit: 100000
4. Event Notification 4. Export Symbol APIs
===================== =====================
The framework includes a simple notification mechanism, in the form of a 4.1. get_tz_trend
netlink event. Netlink socket initialization is done during the _init_
of the framework. Drivers which intend to use the notification mechanism
just need to call thermal_generate_netlink_event() with two arguments viz
(originator, event). The originator is a pointer to struct thermal_zone_device
from where the event has been originated. An integer which represents the
thermal zone device will be used in the message to identify the zone. The
event will be one of:{THERMAL_AUX0, THERMAL_AUX1, THERMAL_CRITICAL,
THERMAL_DEV_FAULT}. Notification can be sent when the current temperature
crosses any of the configured thresholds.
5. Export Symbol APIs
=====================
5.1. get_tz_trend
----------------- -----------------
This function returns the trend of a thermal zone, i.e the rate of change This function returns the trend of a thermal zone, i.e the rate of change
...@@ -751,14 +737,14 @@ are supposed to implement the callback. If they don't, the thermal ...@@ -751,14 +737,14 @@ are supposed to implement the callback. If they don't, the thermal
framework calculated the trend by comparing the previous and the current framework calculated the trend by comparing the previous and the current
temperature values. temperature values.
5.2. get_thermal_instance 4.2. get_thermal_instance
------------------------- -------------------------
This function returns the thermal_instance corresponding to a given This function returns the thermal_instance corresponding to a given
{thermal_zone, cooling_device, trip_point} combination. Returns NULL {thermal_zone, cooling_device, trip_point} combination. Returns NULL
if such an instance does not exist. if such an instance does not exist.
5.3. thermal_notify_framework 4.3. thermal_notify_framework
----------------------------- -----------------------------
This function handles the trip events from sensor drivers. It starts This function handles the trip events from sensor drivers. It starts
...@@ -768,14 +754,14 @@ and does actual throttling for other trip points i.e ACTIVE and PASSIVE. ...@@ -768,14 +754,14 @@ and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
The throttling policy is based on the configured platform data; if no The throttling policy is based on the configured platform data; if no
platform data is provided, this uses the step_wise throttling policy. platform data is provided, this uses the step_wise throttling policy.
5.4. thermal_cdev_update 4.4. thermal_cdev_update
------------------------ ------------------------
This function serves as an arbitrator to set the state of a cooling This function serves as an arbitrator to set the state of a cooling
device. It sets the cooling device to the deepest cooling state if device. It sets the cooling device to the deepest cooling state if
possible. possible.
6. thermal_emergency_poweroff 5. thermal_emergency_poweroff
============================= =============================
On an event of critical trip temperature crossing. Thermal framework On an event of critical trip temperature crossing. Thermal framework
......
...@@ -19,8 +19,6 @@ ...@@ -19,8 +19,6 @@
#include <linux/reboot.h> #include <linux/reboot.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/of.h> #include <linux/of.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <linux/suspend.h> #include <linux/suspend.h>
#define CREATE_TRACE_POINTS #define CREATE_TRACE_POINTS
...@@ -1464,97 +1462,6 @@ struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) ...@@ -1464,97 +1462,6 @@ struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
} }
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
#ifdef CONFIG_NET
static const struct genl_multicast_group thermal_event_mcgrps[] = {
{ .name = THERMAL_GENL_MCAST_GROUP_NAME, },
};
static struct genl_family thermal_event_genl_family __ro_after_init = {
.module = THIS_MODULE,
.name = THERMAL_GENL_FAMILY_NAME,
.version = THERMAL_GENL_VERSION,
.maxattr = THERMAL_GENL_ATTR_MAX,
.mcgrps = thermal_event_mcgrps,
.n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
};
int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event)
{
struct sk_buff *skb;
struct nlattr *attr;
struct thermal_genl_event *thermal_event;
void *msg_header;
int size;
int result;
static unsigned int thermal_event_seqnum;
if (!tz)
return -EINVAL;
/* 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 = tz->id;
thermal_event->event = event;
/* send multicast genetlink message */
genlmsg_end(skb, msg_header);
result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
0, GFP_ATOMIC);
if (result)
dev_err(&tz->device, "Failed to send netlink event:%d", result);
return result;
}
EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
static int __init genetlink_init(void)
{
return genl_register_family(&thermal_event_genl_family);
}
static void genetlink_exit(void)
{
genl_unregister_family(&thermal_event_genl_family);
}
#else /* !CONFIG_NET */
static inline int genetlink_init(void) { return 0; }
static inline void genetlink_exit(void) {}
#endif /* !CONFIG_NET */
static int thermal_pm_notify(struct notifier_block *nb, static int thermal_pm_notify(struct notifier_block *nb,
unsigned long mode, void *_unused) unsigned long mode, void *_unused)
{ {
...@@ -1607,13 +1514,9 @@ static int __init thermal_init(void) ...@@ -1607,13 +1514,9 @@ static int __init thermal_init(void)
if (result) if (result)
goto unregister_governors; goto unregister_governors;
result = genetlink_init();
if (result)
goto unregister_class;
result = of_parse_thermal_zones(); result = of_parse_thermal_zones();
if (result) if (result)
goto exit_netlink; goto unregister_class;
result = register_pm_notifier(&thermal_pm_nb); result = register_pm_notifier(&thermal_pm_nb);
if (result) if (result)
...@@ -1622,8 +1525,6 @@ static int __init thermal_init(void) ...@@ -1622,8 +1525,6 @@ static int __init thermal_init(void)
return 0; return 0;
exit_netlink:
genetlink_exit();
unregister_class: unregister_class:
class_unregister(&thermal_class); class_unregister(&thermal_class);
unregister_governors: unregister_governors:
......
...@@ -544,15 +544,4 @@ static inline void thermal_notify_framework(struct thermal_zone_device *tz, ...@@ -544,15 +544,4 @@ static inline void thermal_notify_framework(struct thermal_zone_device *tz,
{ } { }
#endif /* CONFIG_THERMAL */ #endif /* CONFIG_THERMAL */
#if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event);
#else
static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event)
{
return 0;
}
#endif
#endif /* __THERMAL_H__ */ #endif /* __THERMAL_H__ */
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