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PM / Domains: Add power-on function using names to identify domains

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It sometimes is necessary to turn on a given PM domain when only
the name of it is known and the domain pointer is not readily
available.  For this reason, add a new helper function,
pm_genpd_name_poweron(), allowing the caller to turn on a PM domain
using its name for identification.  To avoid code duplication,
move the domain lookup code to a separate function.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2012-08-07 01:11:14 +02:00
parent fb7268be9f
commit 8bc0251de2
2 changed files with 36 additions and 15 deletions
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46
drivers/base/power/domain.c
View file

@ -53,6 +53,24 @@
static LIST_HEAD(gpd_list);
static DEFINE_MUTEX(gpd_list_lock);
static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name)
{
struct generic_pm_domain *genpd = NULL, *gpd;
if (IS_ERR_OR_NULL(domain_name))
return NULL;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (!strcmp(gpd->name, domain_name)) {
genpd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
return genpd;
}
#ifdef CONFIG_PM
struct generic_pm_domain *dev_to_genpd(struct device *dev)
@ -262,6 +280,18 @@ int pm_genpd_poweron(struct generic_pm_domain *genpd)
return ret;
}
/**
* pm_genpd_name_poweron - Restore power to a given PM domain and its masters.
* @domain_name: Name of the PM domain to power up.
*/
int pm_genpd_name_poweron(const char *domain_name)
{
struct generic_pm_domain *genpd;
genpd = pm_genpd_lookup_name(domain_name);
return genpd ? pm_genpd_poweron(genpd) : -EINVAL;
}
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_RUNTIME
@ -1475,21 +1505,7 @@ int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
int __pm_genpd_name_add_device(const char *domain_name, struct device *dev,
struct gpd_timing_data *td)
{
struct generic_pm_domain *genpd = NULL, *gpd;
if (IS_ERR_OR_NULL(domain_name) || IS_ERR_OR_NULL(dev))
return -EINVAL;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (!strcmp(gpd->name, domain_name)) {
genpd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
return __pm_genpd_add_device(genpd, dev, td);
return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td);
}
/**

5
include/linux/pm_domain.h
View file

@ -161,6 +161,7 @@ extern void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
extern int pm_genpd_name_poweron(const char *domain_name);
extern bool default_stop_ok(struct device *dev);
@ -240,6 +241,10 @@ static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
{
return -ENOSYS;
}
static inline int pm_genpd_name_poweron(const char *domain_name)
{
return -ENOSYS;
}
static inline bool default_stop_ok(struct device *dev)
{
return false;