PM / devfreq: map devfreq drivers to governor using name

[deliverable/linux.git] / drivers / devfreq / governor_powersave.c

diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c
index fec0cdbd24773fd531b5c300bfb4afb5111d9545..8612c0f96b793df48a5e6d5d7289773dafa46e8b 100644 (file)
--- a/drivers/devfreq/governor_powersave.c
+++ b/drivers/devfreq/governor_powersave.c
@@ -23,14 +23,40 @@ static int devfreq_powersave_func(struct devfreq *df,
        return 0;
 }
 
-static int powersave_init(struct devfreq *devfreq)
+static int devfreq_powersave_handler(struct devfreq *devfreq,
+                               unsigned int event, void *data)
 {
-       return update_devfreq(devfreq);
+       int ret = 0;
+
+       if (event == DEVFREQ_GOV_START) {
+               mutex_lock(&devfreq->lock);
+               ret = update_devfreq(devfreq);
+               mutex_unlock(&devfreq->lock);
+       }
+
+       return ret;
 }
 
-const struct devfreq_governor devfreq_powersave = {
+static struct devfreq_governor devfreq_powersave = {
        .name = "powersave",
-       .init = powersave_init,
        .get_target_freq = devfreq_powersave_func,
-       .no_central_polling = true,
+       .event_handler = devfreq_powersave_handler,
 };
+
+static int __init devfreq_powersave_init(void)
+{
+       return devfreq_add_governor(&devfreq_powersave);
+}
+subsys_initcall(devfreq_powersave_init);
+
+static void __exit devfreq_powersave_exit(void)
+{
+       int ret;
+
+       ret = devfreq_remove_governor(&devfreq_powersave);
+       if (ret)
+               pr_err("%s: failed remove governor %d\n", __func__, ret);
+
+       return;
+}
+module_exit(devfreq_powersave_exit);