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PM / devfreq: Add new name attribute for sysfs

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The commit 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for
sysfs") changed the node name to devfreq(x). After this commit, it is not
possible to get the device name through /sys/class/devfreq/devfreq(X)/*.

Add new name attribute in order to get device name.

Cc: stable@vger.kernel.org
Fixes: 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs")
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Chanwoo Choi 2019-11-05 18:18:03 +09:00
parent 5af744ebae
commit 2fee1a7cc6
2 changed files with 16 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-class-devfreq
View File

@ -7,6 +7,13 @@ Description:
The name of devfreq object denoted as ... is same as the
name of device using devfreq.
What: /sys/class/devfreq/.../name
Date: November 2019
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
The /sys/class/devfreq/.../name shows the name of device
of the corresponding devfreq object.
What: /sys/class/devfreq/.../governor
Date: September 2011
Contact: MyungJoo Ham <myungjoo.ham@samsung.com>

9
drivers/devfreq/devfreq.c
View File

@ -1259,6 +1259,14 @@ err_out:
}
EXPORT_SYMBOL(devfreq_remove_governor);
static ssize_t name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct devfreq *devfreq = to_devfreq(dev);
return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent));
}
static DEVICE_ATTR_RO(name);
static ssize_t governor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -1592,6 +1600,7 @@ static ssize_t trans_stat_show(struct device *dev,
static DEVICE_ATTR_RO(trans_stat);
static struct attribute *devfreq_attrs[] = {
&dev_attr_name.attr,
&dev_attr_governor.attr,
&dev_attr_available_governors.attr,
&dev_attr_cur_freq.attr,