1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index aeaa7f846821..0da058bff8eb 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -103,11 +103,14 @@ static struct pm_qos_object *pm_qos_array[] = {
 
 static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
                 size_t count, loff_t *f_pos);
+static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
+                size_t count, loff_t *f_pos);
 static int pm_qos_power_open(struct inode *inode, struct file *filp);
 static int pm_qos_power_release(struct inode *inode, struct file *filp);
 
 static const struct file_operations pm_qos_power_fops = {
         .write = pm_qos_power_write,
+        .read = pm_qos_power_read,
         .open = pm_qos_power_open,
         .release = pm_qos_power_release,
         .llseek = noop_llseek,
@@ -376,6 +379,27 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
 }
 
 
+static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
+                size_t count, loff_t *f_pos)
+{
+        s32 value;
+        unsigned long flags;
+        struct pm_qos_object *o;
+        struct pm_qos_request_list *pm_qos_req = filp->private_data;;
+
+        if (!pm_qos_req)
+                return -EINVAL;
+        if (!pm_qos_request_active(pm_qos_req))
+                return -EINVAL;
+
+        o = pm_qos_array[pm_qos_req->pm_qos_class];
+        spin_lock_irqsave(&pm_qos_lock, flags);
+        value = pm_qos_get_value(o);
+        spin_unlock_irqrestore(&pm_qos_lock, flags);
+
+        return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
+}
+
 static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
                 size_t count, loff_t *f_pos)
 {