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PM / devfreq: Simplify the sysfs name of devfreq-event device 

This patch just removes '.' character from the sysfs name of devfreq-event
device as following. Usually, the subsystem uses the similiar naming style
such as {framework name}{Number}.
- old : /sys/class/devfreq-event/event.(X)
- new : /sys/class/devfreq-event/event(X)

And this patch initializes the value of 'event_no' with -1
in order to remove the unneeded operation (-1) when calling
the atomic_inc_return(&event_no).

Lastly, this patch adds the ABI document for devfreq-event class.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Chanwoo Choi 2017-01-31 16:47:56 +09:00 committed by MyungJoo Ham
parent 29b6968b05
commit 775fa8c3aa
2 changed files with 27 additions and 2 deletions
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25
Documentation/ABI/testing/sysfs-class-devfreq-event Normal file
View File

@ -0,0 +1,25 @@
What: /sys/class/devfreq-event/event(x)/
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
Provide a place in sysfs for the devfreq-event objects.
This allows accessing various devfreq-event specific variables.
The name of devfreq-event object denoted as 'event(x)' which
includes the unique number of 'x' for each devfreq-event object.
What: /sys/class/devfreq-event/event(x)/name
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
The /sys/class/devfreq-event/event(x)/name attribute contains
the name of the devfreq-event object. This attribute is
read-only.
What: /sys/class/devfreq-event/event(x)/enable_count
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
The /sys/class/devfreq-event/event(x)/enable_count attribute
contains the reference count to enable the devfreq-event
object. If the device is enabled, the value of attribute is
greater than zero.

4
drivers/devfreq/devfreq-event.c
View File

@ -306,7 +306,7 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc)
{
struct devfreq_event_dev *edev;
static atomic_t event_no = ATOMIC_INIT(0);
static atomic_t event_no = ATOMIC_INIT(-1);
int ret;
if (!dev || !desc)
@ -329,7 +329,7 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
edev->dev.class = devfreq_event_class;
edev->dev.release = devfreq_event_release_edev;
dev_set_name(&edev->dev, "event.%d", atomic_inc_return(&event_no) - 1);
dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
ret = device_register(&edev->dev);
if (ret < 0) {
put_device(&edev->dev);