diff options
| -rw-r--r-- | drivers/usb/core/hub.h | 2 | ||||
| -rw-r--r-- | drivers/usb/core/port.c | 56 | ||||
| -rw-r--r-- | drivers/usb/core/usb-acpi.c | 41 | ||||
| -rw-r--r-- | drivers/usb/core/usb.h | 6 |
4 files changed, 83 insertions, 22 deletions
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h index fcad5f9d12f0..048c797f394c 100644 --- a/drivers/usb/core/hub.h +++ b/drivers/usb/core/hub.h @@ -84,6 +84,7 @@ struct usb_hub { * @port_owner: port's owner * @peer: related usb2 and usb3 ports (share the same connector) * @connect_type: port's connect type + * @location: opaque representation of platform connector location * @portnum: port index num based one * @power_is_on: port's power state * @did_runtime_put: port has done pm_runtime_put(). @@ -94,6 +95,7 @@ struct usb_port { struct usb_dev_state *port_owner; struct usb_port *peer; enum usb_port_connect_type connect_type; + usb_port_location_t location; u8 portnum; unsigned power_is_on:1; unsigned did_runtime_put:1; diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index 9b7496b52f2a..aea54e8dfe47 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -188,8 +188,42 @@ static void unlink_peers(struct usb_port *left, struct usb_port *right) } /* - * Set the default peer port for root hubs, or via the upstream peer - * relationship for all other hubs + * For each usb hub device in the system check to see if it is in the + * peer domain of the given port_dev, and if it is check to see if it + * has a port that matches the given port by location + */ +static int match_location(struct usb_device *peer_hdev, void *p) +{ + int port1; + struct usb_hcd *hcd, *peer_hcd; + struct usb_port *port_dev = p, *peer; + struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev); + struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent); + + if (!peer_hub) + return 0; + + hcd = bus_to_hcd(hdev->bus); + peer_hcd = bus_to_hcd(peer_hdev->bus); + /* peer_hcd is provisional until we verify it against the known peer */ + if (peer_hcd != hcd->shared_hcd) + return 0; + + for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) { + peer = peer_hub->ports[port1 - 1]; + if (peer && peer->location == port_dev->location) { + link_peers(port_dev, peer); + return 1; /* done */ + } + } + + return 0; +} + +/* + * Find the peer port either via explicit platform firmware "location" + * data, the peer hcd for root hubs, or the upstream peer relationship + * for all other hubs. */ static void find_and_link_peer(struct usb_hub *hub, int port1) { @@ -198,7 +232,17 @@ static void find_and_link_peer(struct usb_hub *hub, int port1) struct usb_device *peer_hdev; struct usb_hub *peer_hub; - if (!hdev->parent) { + /* + * If location data is available then we can only peer this port + * by a location match, not the default peer (lest we create a + * situation where we need to go back and undo a default peering + * when the port is later peered by location data) + */ + if (port_dev->location) { + /* we link the peer in match_location() if found */ + usb_for_each_dev(port_dev, match_location); + return; + } else if (!hdev->parent) { struct usb_hcd *hcd = bus_to_hcd(hdev->bus); struct usb_hcd *peer_hcd = hcd->shared_hcd; @@ -225,8 +269,12 @@ static void find_and_link_peer(struct usb_hub *hub, int port1) if (!peer_hub || port1 > peer_hdev->maxchild) return; + /* + * we found a valid default peer, last check is to make sure it + * does not have location data + */ peer = peer_hub->ports[port1 - 1]; - if (peer) + if (peer && peer->location == 0) link_peers(port_dev, peer); } diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c index d3e7e1b4125e..2776cfe64c09 100644 --- a/drivers/usb/core/usb-acpi.c +++ b/drivers/usb/core/usb-acpi.c @@ -85,19 +85,13 @@ int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable) } EXPORT_SYMBOL_GPL(usb_acpi_set_power_state); -static int usb_acpi_check_port_connect_type(struct usb_device *hdev, - acpi_handle handle, int port1) +static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle, + struct acpi_pld_info *pld) { enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - struct usb_hub *hub = usb_hub_to_struct_hub(hdev); - struct acpi_pld_info *pld; union acpi_object *upc; acpi_status status; - int ret = 0; - - if (!hub) - return 0; /* * According to ACPI Spec 9.13. PLD indicates whether usb port is @@ -107,15 +101,10 @@ static int usb_acpi_check_port_connect_type(struct usb_device *hdev, * a usb device is directly hard-wired to the port. If no visible and * no connectable, the port would be not used. */ - status = acpi_get_physical_device_location(handle, &pld); - if (ACPI_FAILURE(status)) - return -ENODEV; - status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer); upc = buffer.pointer; if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4) { - ret = -EINVAL; goto out; } @@ -126,14 +115,18 @@ static int usb_acpi_check_port_connect_type(struct usb_device *hdev, connect_type = USB_PORT_CONNECT_TYPE_HARD_WIRED; else if (!pld->user_visible) connect_type = USB_PORT_NOT_USED; - hub->ports[port1 - 1]->connect_type = connect_type; - out: - ACPI_FREE(pld); kfree(upc); - return ret; + return connect_type; } + +/* + * Private to usb-acpi, all the core needs to know is that + * port_dev->location is non-zero when it has been set by the firmware. + */ +#define USB_ACPI_LOCATION_VALID (1 << 31) + static struct acpi_device *usb_acpi_find_companion(struct device *dev) { struct usb_device *udev; @@ -164,6 +157,9 @@ static struct acpi_device *usb_acpi_find_companion(struct device *dev) } else if (is_usb_port(dev)) { struct usb_port *port_dev = to_usb_port(dev); int port1 = port_dev->portnum; + struct acpi_pld_info *pld; + acpi_handle *handle; + acpi_status status; /* Get the struct usb_device point of port's hub */ udev = to_usb_device(dev->parent->parent); @@ -194,7 +190,16 @@ static struct acpi_device *usb_acpi_find_companion(struct device *dev) if (!adev) return NULL; } - usb_acpi_check_port_connect_type(udev, adev->handle, port1); + handle = adev->handle; + status = acpi_get_physical_device_location(handle, &pld); + if (ACPI_FAILURE(status) || !pld) + return adev; + + port_dev->location = USB_ACPI_LOCATION_VALID + | pld->group_token << 8 | pld->group_position; + port_dev->connect_type = usb_acpi_get_connect_type(handle, pld); + ACPI_FREE(pld); + return adev; } diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 6afa738b5ba4..98dc08e13448 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -171,6 +171,12 @@ extern void usbfs_conn_disc_event(void); extern int usb_devio_init(void); extern void usb_devio_cleanup(void); +/* + * Firmware specific cookie identifying a port's location. '0' == no location + * data available + */ +typedef u32 usb_port_location_t; + /* internal notify stuff */ extern void usb_notify_add_device(struct usb_device *udev); extern void usb_notify_remove_device(struct usb_device *udev); |