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>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 999600da21c7..f2f8a976c465 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -464,6 +464,19 @@ static ssize_t show_governor(struct device *dev,
 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 ssize_t show_max_freq(struct device *dev, struct device_attribute *attr,
 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),