PM / devfreq: Add current freq callback in device profile
Devfreq returns governor predicted frequency as current frequency
via sysfs interface. But device may not support all frequencies
that governor predicts. So add a callback in device profile to get
current freq from driver. Also add a new sysfs node to expose
governor predicted next target frequency.
Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 7f98a905dca6e4f144cdd4462edeac00c2bdc379
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I2e8f27c2ee2529230cb93e135439e012266a66b8
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 359107f..d49fb4f 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -464,6 +464,19 @@
static ssize_t show_freq(struct device *dev,
struct device_attribute *attr, char *buf)
{
+ unsigned long freq;
+ struct devfreq *devfreq = to_devfreq(dev);
+
+ if (devfreq->profile->get_cur_freq &&
+ !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
+ return sprintf(buf, "%lu\n", freq);
+
+ return sprintf(buf, "%lu\n", devfreq->previous_freq);
+}
+
+static ssize_t show_target_freq(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq);
}
@@ -563,6 +576,7 @@
static struct device_attribute devfreq_attrs[] = {
__ATTR(governor, S_IRUGO, show_governor, NULL),
__ATTR(cur_freq, S_IRUGO, show_freq, NULL),
+ __ATTR(target_freq, S_IRUGO, show_target_freq, NULL),
__ATTR(polling_interval, S_IRUGO | S_IWUSR, show_polling_interval,
store_polling_interval),
__ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq),