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usb: Register usb port's acpi power resources

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This patch is to register usb port's acpi power resources. Create
link between usb port device and its acpi power resource.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lan Tianyu 2013-01-23 04:26:27 +08:00 • committed by Greg Kroah-Hartman
commit 88bb965ed7
3 changed files with 29 additions and 0 deletions
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5
drivers/usb/core/port.c
View file

@ -66,6 +66,7 @@ static void usb_port_device_release(struct device *dev)
{
struct usb_port *port_dev = to_usb_port(dev);
usb_acpi_unregister_power_resources(dev);
kfree(port_dev);
}
@ -95,6 +96,10 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
if (retval)
goto error_register;
retval = usb_acpi_register_power_resources(&port_dev->dev);
if (retval && retval != -ENODEV)
dev_warn(&port_dev->dev, "the port can't register its ACPI power resource.\n");
return 0;
error_register:

18
drivers/usb/core/usb-acpi.c
View file

@ -216,6 +216,24 @@ static struct acpi_bus_type usb_acpi_bus = {
.find_device = usb_acpi_find_device,
};
int usb_acpi_register_power_resources(struct device *dev)
{
acpi_handle port_handle = DEVICE_ACPI_HANDLE(dev);
if (!port_handle)
return -ENODEV;
return acpi_power_resource_register_device(dev, port_handle);
}
void usb_acpi_unregister_power_resources(struct device *dev)
{
acpi_handle port_handle = DEVICE_ACPI_HANDLE(dev);
if (port_handle)
acpi_power_resource_unregister_device(dev, port_handle);
}
int usb_acpi_register(void)
{
return register_acpi_bus_type(&usb_acpi_bus);

6
drivers/usb/core/usb.h
View file

@ -191,7 +191,13 @@ extern int usb_acpi_register(void);
extern void usb_acpi_unregister(void);
extern acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
int port1);
extern int usb_acpi_register_power_resources(struct device *dev);
extern void usb_acpi_unregister_power_resources(struct device *dev);
#else
static inline int usb_acpi_register(void) { return 0; };
static inline void usb_acpi_unregister(void) { };
static inline int usb_acpi_register_power_resources(struct device *dev)
{ return 0; };
static inline void usb_acpi_unregister_power_resources(struct device *dev)
{ };
#endif