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Commit 775fa8c3 authored by Chanwoo Choi's avatar Chanwoo Choi Committed by MyungJoo Ham
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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: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
parent 29b6968b

Documentation/ABI/testing/sysfs-class-devfreq-event

0 → 100644
+25 −0
Original line number Diff line number Diff line 
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.

drivers/devfreq/devfreq-event.c

+2 −2
Original line number Diff line number Diff line
@@ -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);