diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/Kconfig | 14 | ||||
| -rw-r--r-- | kernel/power/main.c | 17 |
2 files changed, 31 insertions, 0 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 72067cbdb37f..91e09d3b2eb2 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -208,3 +208,17 @@ config APM_EMULATION random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS). + +config PM_RUNTIME + bool "Run-time PM core functionality" + depends on PM + ---help--- + Enable functionality allowing I/O devices to be put into energy-saving + (low power) states at run time (or autosuspended) after a specified + period of inactivity and woken up in response to a hardware-generated + wake-up event or a driver's request. + + Hardware support is generally required for this functionality to work + and the bus type drivers of the buses the devices are on are + responsible for the actual handling of the autosuspend requests and + wake-up events. diff --git a/kernel/power/main.c b/kernel/power/main.c index f710e36930cc..347d2cc88cd0 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -11,6 +11,7 @@ #include <linux/kobject.h> #include <linux/string.h> #include <linux/resume-trace.h> +#include <linux/workqueue.h> #include "power.h" @@ -217,8 +218,24 @@ static struct attribute_group attr_group = { .attrs = g, }; +#ifdef CONFIG_PM_RUNTIME +struct workqueue_struct *pm_wq; + +static int __init pm_start_workqueue(void) +{ + pm_wq = create_freezeable_workqueue("pm"); + + return pm_wq ? 0 : -ENOMEM; +} +#else +static inline int pm_start_workqueue(void) { return 0; } +#endif + static int __init pm_init(void) { + int error = pm_start_workqueue(); + if (error) + return error; power_kobj = kobject_create_and_add("power", NULL); if (!power_kobj) return -ENOMEM; |