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PM / devfreq: Add new name attribute for sysfs

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The commit 4585fbcb53 ("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: 4585fbcb53 ("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 The name of devfreq object denoted as ... is same as the
name of device using devfreq. 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 What: /sys/class/devfreq/.../governor
Date: September 2011 Date: September 2011
Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 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); 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, static ssize_t governor_show(struct device *dev,
struct device_attribute *attr, char *buf) 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 DEVICE_ATTR_RO(trans_stat);
static struct attribute *devfreq_attrs[] = { static struct attribute *devfreq_attrs[] = {
&dev_attr_name.attr,
&dev_attr_governor.attr, &dev_attr_governor.attr,
&dev_attr_available_governors.attr, &dev_attr_available_governors.attr,
&dev_attr_cur_freq.attr, &dev_attr_cur_freq.attr,