This patch is to add runtime pm callback for usb port device.
Set/clear PORT_POWER feature in the resume/suspend callbak.
Add portnum for struct usb_port to record port number. Do
pm_rumtime_get_sync/put(portdev) when a device is plugged/unplugged
to prevent it from being power off when it is active.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/usb/core/hub.c | 20 ++++++++++++++++++++
drivers/usb/core/hub.h | 5 +++++
drivers/usb/core/port.c | 43 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 68 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index dd0694c..3e69d66 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -694,6 +694,20 @@ static void hub_tt_work(struct work_struct *work)
spin_unlock_irqrestore (&hub->tt.lock, flags);
}
+int usb_hub_set_port_power(struct usb_device *hdev, int port1,
+ bool set)
+{
+ int ret;
+
+ if (set)
+ ret = set_port_feature(hdev, port1,
+ USB_PORT_FEAT_POWER);
+ else
+ ret = clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_POWER);
+ return ret;
+}
+
/**
* usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
* @urb: an URB associated with the failed or incomplete split transaction
@@ -1922,6 +1936,9 @@ void usb_disconnect(struct usb_device **pdev)
sysfs_remove_link(&udev->dev.kobj, "port");
sysfs_remove_link(&port_dev->dev.kobj, "device");
+
+ /* put the related port to idle when device is unplugged */
+ pm_runtime_put(&port_dev->dev);
}
usb_remove_ep_devs(&udev->ep0);
@@ -2232,6 +2249,9 @@ int usb_new_device(struct usb_device *udev)
sysfs_remove_link(&udev->dev.kobj, "port");
goto fail;
}
+
+ /* resume the related port device */
+ pm_runtime_get_sync(&port_dev->dev);
}
(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index b028b6b..1b574a2 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -38,6 +38,7 @@
#include <linux/freezer.h>
#include <linux/random.h>
#include <linux/uaccess.h>
+#include <linux/pm_qos.h>
#include <asm/byteorder.h>
@@ -98,12 +99,14 @@ struct usb_hub {
* @dev: generic device interface
* @port_owner: port's owner
* @connect_type: port's connect type
+ * @portnum: port index num based one
*/
struct usb_port {
struct usb_device *child;
struct device dev;
struct dev_state *port_owner;
enum usb_port_connect_type connect_type;
+ u8 portnum;
};
#define to_usb_port(_dev) \
@@ -113,4 +116,6 @@ extern int usb_hub_create_port_device(struct usb_hub *hub,
int port1);
extern void usb_hub_remove_port_device(struct usb_hub *hub,
int port1);
+extern int usb_hub_set_port_power(struct usb_device *hdev,
+ int port1, bool set);
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 187046a..d44d8d3 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -66,9 +66,49 @@ static void usb_port_device_release(struct device *dev)
kfree(port_dev);
}
+static int usb_port_runtime_resume(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ struct usb_device *hdev =
+ to_usb_device(dev->parent->parent);
+
+ return usb_hub_set_port_power(hdev, port_dev->portnum,
+ true);
+}
+
+static int usb_port_runtime_suspend(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ struct usb_device *hdev =
+ to_usb_device(dev->parent->parent);
+
+ if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
+ == PM_QOS_FLAGS_ALL)
+ return -EAGAIN;
+
+ return usb_hub_set_port_power(hdev, port_dev->portnum,
+ false);
+}
+
+static int usb_port_runtime_idle(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+
+ return pm_runtime_suspend(&port_dev->dev);
+}
+
+static const struct dev_pm_ops usb_port_pm_ops = {
+#ifdef CONFIG_USB_SUSPEND
+.runtime_suspend = usb_port_runtime_suspend,
+.runtime_resume = usb_port_runtime_resume,
+.runtime_idle = usb_port_runtime_idle,
+#endif
+};
+
struct device_type usb_port_device_type = {
.name = "usb_port",
.release = usb_port_device_release,
+ .pm = &usb_port_pm_ops,
};
int usb_hub_create_port_device(struct usb_hub *hub, int port1)
@@ -83,6 +123,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
}
hub->ports[port1 - 1] = port_dev;
+ port_dev->portnum = port1;
port_dev->dev.parent = hub->intfdev;
port_dev->dev.groups = port_dev_group;
port_dev->dev.type = &usb_port_device_type;
@@ -92,6 +133,8 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
if (retval)
goto error_register;
+ pm_runtime_set_active(&port_dev->dev);
+ pm_runtime_enable(&port_dev->dev);
usb_acpi_register_power_resources(&port_dev->dev);
return 0;
--
1.7.9.5
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