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Thermal: Add thermal governor registration APIs

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This patch creates a structure to hold platform
thermal governor information, and provides APIs
for individual thermal governors to register/unregister
with the Thermal framework.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Durgadoss R 2012-09-18 11:04:57 +05:30 committed by Zhang Rui
parent 50125a9b27
commit a4a15485fb
2 changed files with 106 additions and 0 deletions
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90
drivers/thermal/thermal_sys.c
View File

@ -49,7 +49,86 @@ static DEFINE_MUTEX(thermal_idr_lock);
static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
static LIST_HEAD(thermal_governor_list);
static DEFINE_MUTEX(thermal_list_lock);
static DEFINE_MUTEX(thermal_governor_lock);
static struct thermal_governor *__find_governor(const char *name)
{
struct thermal_governor *pos;
list_for_each_entry(pos, &thermal_governor_list, governor_list)
if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
return pos;
return NULL;
}
int thermal_register_governor(struct thermal_governor *governor)
{
int err;
const char *name;
struct thermal_zone_device *pos;
if (!governor)
return -EINVAL;
mutex_lock(&thermal_governor_lock);
err = -EBUSY;
if (__find_governor(governor->name) == NULL) {
err = 0;
list_add(&governor->governor_list, &thermal_governor_list);
}
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node) {
if (pos->governor)
continue;
if (pos->tzp)
name = pos->tzp->governor_name;
else
name = DEFAULT_THERMAL_GOVERNOR;
if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
pos->governor = governor;
}
mutex_unlock(&thermal_list_lock);
mutex_unlock(&thermal_governor_lock);
return err;
}
EXPORT_SYMBOL_GPL(thermal_register_governor);
void thermal_unregister_governor(struct thermal_governor *governor)
{
struct thermal_zone_device *pos;
if (!governor)
return;
mutex_lock(&thermal_governor_lock);
if (__find_governor(governor->name) == NULL)
goto exit;
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node) {
if (!strnicmp(pos->governor->name, governor->name,
THERMAL_NAME_LENGTH))
pos->governor = NULL;
}
mutex_unlock(&thermal_list_lock);
list_del(&governor->governor_list);
exit:
mutex_unlock(&thermal_governor_lock);
return;
}
EXPORT_SYMBOL_GPL(thermal_unregister_governor);
static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
@ -1437,6 +1516,16 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
goto unregister;
/* Update 'this' zone's governor information */
mutex_lock(&thermal_governor_lock);
if (tz->tzp)
tz->governor = __find_governor(tz->tzp->governor_name);
else
tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
mutex_unlock(&thermal_governor_lock);
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
@ -1500,6 +1589,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
remove_trip_attrs(tz);
tz->governor = NULL;
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);

16
include/linux/thermal.h
View File

@ -46,6 +46,9 @@
#define THERMAL_GENL_VERSION 0x01
#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
/* Default Thermal Governor: Does Linear Throttling */
#define DEFAULT_THERMAL_GOVERNOR "step_wise"
struct thermal_zone_device;
struct thermal_cooling_device;
@ -158,6 +161,7 @@ struct thermal_zone_device {
unsigned int forced_passive;
const struct thermal_zone_device_ops *ops;
const struct thermal_zone_params *tzp;
struct thermal_governor *governor;
struct list_head thermal_instances;
struct idr idr;
struct mutex lock; /* protect thermal_instances list */
@ -165,6 +169,14 @@ struct thermal_zone_device {
struct delayed_work poll_queue;
};
/* Structure that holds thermal governor information */
struct thermal_governor {
char name[THERMAL_NAME_LENGTH];
int (*throttle)(struct thermal_zone_device *tz, int trip);
struct list_head governor_list;
struct module *owner;
};
/* Structure that holds binding parameters for a zone */
struct thermal_bind_params {
struct thermal_cooling_device *cdev;
@ -189,6 +201,7 @@ struct thermal_bind_params {
/* Structure to define Thermal Zone parameters */
struct thermal_zone_params {
char governor_name[THERMAL_NAME_LENGTH];
int num_tbps; /* Number of tbp entries */
struct thermal_bind_params *tbp;
};
@ -219,6 +232,9 @@ int get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
struct thermal_cooling_device *, int);
int thermal_register_governor(struct thermal_governor *);
void thermal_unregister_governor(struct thermal_governor *);
#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(u32 orig, enum events event);
#else