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-rw-r--r--kernel/pm_qos_params.c24
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)
{