PM / devfreq: Add sysfs node for representing frequency transition information.

[cascardo/linux.git] / include / linux / devfreq.h

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 1461fb2..bc35c4a 100644 (file)
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -73,6 +73,8 @@ struct devfreq_dev_status {
  *                     from devfreq_remove_device() call. If the user
  *                     has registered devfreq->nb at a notifier-head,
  *                     this is the time to unregister it.
+ * @freq_table:        Optional list of frequencies to support statistics.
+ * @max_state: The size of freq_table.
  */
 struct devfreq_dev_profile {
        unsigned long initial_freq;
@@ -83,6 +85,9 @@ struct devfreq_dev_profile {
                              struct devfreq_dev_status *stat);
        int (*get_cur_freq)(struct device *dev, unsigned long *freq);
        void (*exit)(struct device *dev);
+
+       unsigned int *freq_table;
+       unsigned int max_state;
 };
 
 /**
@@ -127,6 +132,10 @@ struct devfreq_governor {
  * @min_freq:  Limit minimum frequency requested by user (0: none)
  * @max_freq:  Limit maximum frequency requested by user (0: none)
  * @stop_polling:       devfreq polling status of a device.
+ * @total_trans:       Number of devfreq transitions
+ * @trans_table:       Statistics of devfreq transitions
+ * @time_in_state:     Statistics of devfreq states
+ * @last_stat_updated: The last time stat updated
  *
  * This structure stores the devfreq information for a give device.
  *
@@ -153,6 +162,12 @@ struct devfreq {
        unsigned long min_freq;
        unsigned long max_freq;
        bool stop_polling;
+
+       /* information for device freqeuncy transition */
+       unsigned int total_trans;
+       unsigned int *trans_table;
+       unsigned long *time_in_state;
+       unsigned long last_stat_updated;
 };
 
 #if defined(CONFIG_PM_DEVFREQ)