/** * 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; }