This patch is to expose usb port's pm qos flags(pm_qos_no_power_off,
pm_qos_remote_wakeup) to user space. User can set pm_qos_no_power_off
flag to prohibit the port from being power off.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/usb/core/port.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index b7388fd..5a7a833 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -2,6 +2,7 @@
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/usb.h>
+#include <linux/pm_qos.h>
#include "usb.h"
@@ -48,7 +49,7 @@ static const struct attribute_group *port_dev_group[] = {
static void usb_port_device_release(struct device *dev)
{
struct usb_port *port_dev = to_usb_port(dev);
-
+ dev_pm_qos_hide_flags(dev);
usb_acpi_unregister_power_resources(dev);
kfree(port_dev);
}
@@ -110,12 +111,19 @@ int usb_hub_create_port_device(struct device *intfdev,
if (retval)
goto error_register;
+ retval = dev_pm_qos_expose_flags(&port_dev->dev,
+ PM_QOS_FLAG_NO_POWER_OFF);
+ if (retval)
+ goto error_expose_pm_qos;
+
pm_runtime_set_active(&port_dev->dev);
pm_runtime_enable(&port_dev->dev);
usb_acpi_register_power_resources(&port_dev->dev);
return 0;
+error_expose_pm_qos:
+ device_del(&port_dev->dev);
error_register:
put_device(&port_dev->dev);
return retval;
--
1.7.10.4
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