Now that governor list can be variable, knowing the available governors
is useful to be able to select a governor using relevant sysfs node.
Cc: Rajagopal Venkat <rajagopal.ven...@linaro.org>
Cc: MyungJoo Ham <myungjoo....@samsung.com>
Cc: Kyungmin Park <kyungmin.p...@samsung.com>
Cc: "Rafael J. Wysocki" <r...@sisk.pl>
Cc: Kevin Hilman <khil...@ti.com>
Cc: linux...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Nishanth Menon <n...@ti.com>
---
Documentation/ABI/testing/sysfs-class-devfreq | 7 +++++++
drivers/devfreq/devfreq.c | 22 ++++++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-devfreq
b/Documentation/ABI/testing/sysfs-class-devfreq
index 293f6b2..0daa83f 100644
--- a/Documentation/ABI/testing/sysfs-class-devfreq
+++ b/Documentation/ABI/testing/sysfs-class-devfreq
@@ -60,3 +60,10 @@ Description:
the available frequencies of the corresponding devfreq object.
This is a snapshot of available frequencies and not limited
by the min/max frequency restrictions.
+
+What: /sys/class/devfreq/.../available_governors
+Date: October 2012
+Contact: Nishanth Menon <n...@ti.com>
+Description:
+ The /sys/class/devfreq/.../available_governors shows
+ currently available governors in the system.
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 8535f8c..9ed3ca5 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -666,6 +666,27 @@ out:
ret = count;
return ret;
}
+static ssize_t show_available_governors(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct devfreq_governor *tmp_governor;
+ ssize_t count = 0;
+
+ mutex_lock(&devfreq_list_lock);
+ list_for_each_entry(tmp_governor, &devfreq_governor_list, node)
+ count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
+ "%s ", tmp_governor->name);
+ mutex_unlock(&devfreq_list_lock);
+
+ /* Truncate the trailing space */
+ if (count)
+ count--;
+
+ count += sprintf(&buf[count], "\n");
+
+ return count;
+}
static ssize_t show_freq(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -812,6 +833,7 @@ static ssize_t show_available_freqs(struct device *d,
static struct device_attribute devfreq_attrs[] = {
__ATTR(governor, S_IRUGO | S_IWUSR, show_governor, store_governor),
+ __ATTR(available_governors, S_IRUGO, show_available_governors, NULL),
__ATTR(cur_freq, S_IRUGO, show_freq, NULL),
__ATTR(available_frequencies, S_IRUGO, show_available_freqs, NULL),
__ATTR(target_freq, S_IRUGO, show_target_freq, NULL),
--
1.7.9.5
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