/**
* usb_acpi_set_power_state - control usb port's power via acpi power
* resource
* @hdev: USB device belonging to the usb hub
* @index: port index based zero
* @enable: power state expected to be set
*
* Notice to use usb_acpi_power_manageable() to check whether the usb port
* has acpi power resource before invoking this function.
*
* Returns 0 on success, else negative errno.
*/
int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable)
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
struct usb_port *port_dev;
acpi_handle port_handle;
unsigned char state;
int port1 = index + 1;
int error = -EINVAL;
if (!hub)
return -ENODEV;
port_dev = hub->ports[port1 - 1];
port_handle = (acpi_handle) usb_get_hub_port_acpi_handle(hdev, port1);
if (!port_handle)
return error;
if (enable)
state = ACPI_STATE_D0;
else
state = ACPI_STATE_D3_COLD;
error = acpi_bus_set_power(port_handle, state);
if (!error)
dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable);
else
dev_dbg(&port_dev->dev, "acpi: power failed to be set\n");
return error;
}
/**
* usb_acpi_set_power_state - control usb port's power via acpi power
* resource
* @hdev: USB device belonging to the usb hub
* @index: port index based zero
* @enable: power state expected to be set
*
* Notice to use usb_acpi_power_manageable() to check whether the usb port
* has acpi power resource before invoking this function.
*
* Returns 0 on success, else negative errno.
*/
int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable)
{
acpi_handle port_handle;
unsigned char state;
int port1 = index + 1;
int error = -EINVAL;
port_handle = (acpi_handle)usb_get_hub_port_acpi_handle(hdev,
port1);
if (!port_handle)
return error;
if (enable)
state = ACPI_STATE_D0;
else
state = ACPI_STATE_D3_COLD;
error = acpi_bus_set_power(port_handle, state);
if (!error)
dev_dbg(&hdev->dev, "The power of hub port %d was set to %d\n",
port1, enable);
else
dev_dbg(&hdev->dev, "The power of hub port failed to be set\n");
return error;
}
/**
* usb_acpi_power_manageable - check whether usb port has
* acpi power resource.
* @hdev: USB device belonging to the usb hub
* @index: port index based zero
*
* Return true if the port has acpi power resource and false if no.
*/
bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
{
acpi_handle port_handle;
int port1 = index + 1;
port_handle = usb_get_hub_port_acpi_handle(hdev,
port1);
if (port_handle)
return acpi_bus_power_manageable(port_handle);
else
return false;
}
static struct acpi_device *usb_acpi_find_companion(struct device *dev)
{
int port1;
struct usb_device *udev;
acpi_handle *parent_handle;
/*
* In the ACPI DSDT table, only usb root hub and usb ports are
* acpi device nodes. The hierarchy like following.
* Device (EHC1)
* Device (HUBN)
* Device (PR01)
* Device (PR11)
* Device (PR12)
* Device (PR13)
* ...
* So all binding process is divided into two parts. binding
* root hub and usb ports.
*/
if (is_usb_device(dev)) {
udev = to_usb_device(dev);
port1 = udev->portnum;
if (udev->parent) {
struct usb_hub *hub;
hub = usb_hub_to_struct_hub(udev->parent);
/*
* According usb port's connect type to set usb device's
* removability.
*/
switch (hub->ports[port1 - 1]->connect_type) {
case USB_PORT_CONNECT_TYPE_HOT_PLUG:
udev->removable = USB_DEVICE_REMOVABLE;
break;
case USB_PORT_CONNECT_TYPE_HARD_WIRED:
udev->removable = USB_DEVICE_FIXED;
break;
default:
udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
break;
}
return NULL;
}
/* root hub's parent is the usb hcd. */
return acpi_find_child_device(ACPI_COMPANION(dev->parent),
port1, false);
} else if (is_usb_port(dev)) {
struct usb_port *port_dev = to_usb_port(dev);
struct acpi_device *adev = NULL;
/* Get the struct usb_device point of port's hub */
udev = to_usb_device(dev->parent->parent);
port1 = port_dev->portnum;
/*
* The root hub ports' parent is the root hub. The non-root-hub
* ports' parent is the parent hub port which the hub is
* connected to.
*/
if (!udev->parent) {
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
int raw;
raw = usb_hcd_find_raw_port_number(hcd, port1);
adev = acpi_find_child_device(ACPI_COMPANION(&udev->dev),
raw, false);
if (!adev)
return NULL;
} else {
parent_handle =
usb_get_hub_port_acpi_handle(udev->parent,
udev->portnum);
if (!parent_handle)
return NULL;
acpi_bus_get_device(parent_handle, &adev);
adev = acpi_find_child_device(adev, port1, false);
if (!adev)
return NULL;
}
usb_acpi_check_port_connect_type(udev, adev->handle, port1);
return adev;
}
return NULL;
}
static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
{
struct usb_device *udev;
acpi_handle *parent_handle;
int port_num;
/*
* In the ACPI DSDT table, only usb root hub and usb ports are
* acpi device nodes. The hierarchy like following.
* Device (EHC1)
* Device (HUBN)
* Device (PR01)
* Device (PR11)
* Device (PR12)
* Device (PR13)
* ...
* So all binding process is divided into two parts. binding
* root hub and usb ports.
*/
if (is_usb_device(dev)) {
udev = to_usb_device(dev);
if (udev->parent) {
enum usb_port_connect_type type;
/*
* According usb port's connect type to set usb device's
* removability.
*/
type = usb_get_hub_port_connect_type(udev->parent,
udev->portnum);
switch (type) {
case USB_PORT_CONNECT_TYPE_HOT_PLUG:
udev->removable = USB_DEVICE_REMOVABLE;
break;
case USB_PORT_CONNECT_TYPE_HARD_WIRED:
udev->removable = USB_DEVICE_FIXED;
break;
default:
udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
break;
}
return -ENODEV;
}
/* root hub's parent is the usb hcd. */
parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
*handle = acpi_get_child(parent_handle, udev->portnum);
if (!*handle)
return -ENODEV;
return 0;
} else if (is_usb_port(dev)) {
sscanf(dev_name(dev), "port%d", &port_num);
/* Get the struct usb_device point of port's hub */
udev = to_usb_device(dev->parent->parent);
/*
* The root hub ports' parent is the root hub. The non-root-hub
* ports' parent is the parent hub port which the hub is
* connected to.
*/
if (!udev->parent) {
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(&udev->dev),
port_num);
if (!*handle)
return -ENODEV;
} else {
parent_handle =
usb_get_hub_port_acpi_handle(udev->parent,
udev->portnum);
if (!parent_handle)
return -ENODEV;
*handle = acpi_get_child(parent_handle, port_num);
if (!*handle)
return -ENODEV;
}
usb_acpi_check_port_connect_type(udev, *handle, port_num);
} else
return -ENODEV;
return 0;
}
