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authorRajagopal Venkat <rajagopal.venkat@linaro.org>2012-10-26 01:50:26 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:35:04 +0100
commit7f98a905dca6e4f144cdd4462edeac00c2bdc379 (patch)
tree4841af3592cbd0b21f50a40f17900dfc9fc40804 /drivers/devfreq
parent206c30cfeb7c05dfb9fdfd81b1deb933627e43c1 (diff)
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>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/devfreq.c14
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),