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PM / devfreq: Add suspend and resume apis

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Add devfreq suspend/resume apis for devfreq users. This patch
supports suspend and resume of devfreq load monitoring, required
for devices which can idle.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rajagopal Venkat 2012-10-26 01:50:18 +02:00 committed by Rafael J. Wysocki
parent 7e6fdd4bad
commit 206c30cfeb
4 changed files with 51 additions and 0 deletions
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28
drivers/devfreq/devfreq.c
View File

@ -427,6 +427,34 @@ int devfreq_remove_device(struct devfreq *devfreq)
}
EXPORT_SYMBOL(devfreq_remove_device);
/**
* devfreq_suspend_device() - Suspend devfreq of a device.
* @devfreq: the devfreq instance to be suspended
*/
int devfreq_suspend_device(struct devfreq *devfreq)
{
if (!devfreq)
return -EINVAL;
return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_SUSPEND, NULL);
}
EXPORT_SYMBOL(devfreq_suspend_device);
/**
* devfreq_resume_device() - Resume devfreq of a device.
* @devfreq: the devfreq instance to be resumed
*/
int devfreq_resume_device(struct devfreq *devfreq)
{
if (!devfreq)
return -EINVAL;
return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_RESUME, NULL);
}
EXPORT_SYMBOL(devfreq_resume_device);
static ssize_t show_governor(struct device *dev,
struct device_attribute *attr, char *buf)
{

2
drivers/devfreq/governor.h
View File

@ -22,6 +22,8 @@
#define DEVFREQ_GOV_START 0x1
#define DEVFREQ_GOV_STOP 0x2
#define DEVFREQ_GOV_INTERVAL 0x3
#define DEVFREQ_GOV_SUSPEND 0x4
#define DEVFREQ_GOV_RESUME 0x5
/* Caution: devfreq->lock must be locked before calling update_devfreq */
extern int update_devfreq(struct devfreq *devfreq);

9
drivers/devfreq/governor_simpleondemand.c
View File

@ -104,6 +104,15 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
case DEVFREQ_GOV_INTERVAL:
devfreq_interval_update(devfreq, (unsigned int *)data);
break;
case DEVFREQ_GOV_SUSPEND:
devfreq_monitor_suspend(devfreq);
break;
case DEVFREQ_GOV_RESUME:
devfreq_monitor_resume(devfreq);
break;
default:
break;
}

12
include/linux/devfreq.h
View File

@ -158,6 +158,8 @@ extern struct devfreq *devfreq_add_device(struct device *dev,
const struct devfreq_governor *governor,
void *data);
extern int devfreq_remove_device(struct devfreq *devfreq);
extern int devfreq_suspend_device(struct devfreq *devfreq);
extern int devfreq_resume_device(struct devfreq *devfreq);
/* Helper functions for devfreq user device driver with OPP. */
extern struct opp *devfreq_recommended_opp(struct device *dev,
@ -211,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
static int devfreq_suspend_device(struct devfreq *devfreq)
{
return 0;
}
static int devfreq_resume_device(struct devfreq *devfreq)
{
return 0;
}
static struct opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags)
{