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path: root/drivers/devfreq
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Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/devfreq.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 0d7be03d561f..ff960f084c11 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -688,6 +688,49 @@ static ssize_t show_governor(struct device *dev,
return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name);
}
+static ssize_t store_governor(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct devfreq *df = to_devfreq(dev);
+ int ret;
+ char str_governor[DEVFREQ_NAME_LEN + 1];
+ struct devfreq_governor *governor;
+
+ ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor);
+ if (ret != 1)
+ return -EINVAL;
+
+ mutex_lock(&devfreq_list_lock);
+ governor = find_devfreq_governor(str_governor);
+ if (IS_ERR(governor)) {
+ ret = PTR_ERR(governor);
+ goto out;
+ }
+ if (df->governor == governor)
+ goto out;
+
+ if (df->governor) {
+ ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
+ if (ret) {
+ dev_warn(dev, "%s: Governor %s not stopped(%d)\n",
+ __func__, df->governor->name, ret);
+ goto out;
+ }
+ }
+ df->governor = governor;
+ strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
+ ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
+ if (ret)
+ dev_warn(dev, "%s: Governor %s not started(%d)\n",
+ __func__, df->governor->name, ret);
+out:
+ mutex_unlock(&devfreq_list_lock);
+
+ if (!ret)
+ ret = count;
+ return ret;
+}
+
static ssize_t show_freq(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -873,7 +916,7 @@ static ssize_t show_trans_table(struct device *dev, struct device_attribute *att
}
static struct device_attribute devfreq_attrs[] = {
- __ATTR(governor, S_IRUGO, show_governor, NULL),
+ __ATTR(governor, S_IRUGO | S_IWUSR, show_governor, store_governor),
__ATTR(cur_freq, S_IRUGO, show_freq, NULL),
__ATTR(available_frequencies, S_IRUGO, show_available_freqs, NULL),
__ATTR(target_freq, S_IRUGO, show_target_freq, NULL),