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Subject[PATCH v3] PM / devfreq: Add new name attribute for sysfs
Date
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>
---
Changes from v2:
- Change the order of name_show() according to the sequence in devfreq_attrs[]

Changes from v1:
- Update sysfs-class-devfreq documentation
- Show device name directly from 'devfreq->dev.parent'

Documentation/ABI/testing/sysfs-class-devfreq | 7 +++++++
drivers/devfreq/devfreq.c | 9 +++++++++
2 files changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq
index 01196e19afca..75897e2fde43 100644
--- a/Documentation/ABI/testing/sysfs-class-devfreq
+++ b/Documentation/ABI/testing/sysfs-class-devfreq
@@ -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>
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 65a4b6cf3fa5..6f4d93d2a651 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1169,6 +1169,14 @@ int devfreq_remove_governor(struct devfreq_governor *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,
struct device_attribute *attr, char *buf)
{
@@ -1477,6 +1485,7 @@ 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,
--
2.17.1
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