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path: root/drivers/usb/core/usb-acpi.c
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Diffstat (limited to 'drivers/usb/core/usb-acpi.c')
-rw-r--r--drivers/usb/core/usb-acpi.c205
1 files changed, 157 insertions, 48 deletions
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index 8947b203d5a4..0ef7d42d8abe 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -19,20 +19,91 @@
#include "usb.h"
-static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle)
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(usb_acpi_power_manageable);
+
+/**
+ * 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;
+}
+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)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *upc;
+ struct acpi_pld pld;
int ret = 0;
- status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
-
+ /*
+ * Accoding to ACPI Spec 9.13. PLD indicates whether usb port is
+ * user visible and _UPC indicates whether it is connectable. If
+ * the port was visible and connectable, it could be freely connected
+ * and disconnected with USB devices. If no visible and connectable,
+ * 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;
@@ -40,69 +111,107 @@ static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle)
}
if (upc->package.elements[0].integer.value)
- udev->removable = USB_DEVICE_REMOVABLE;
- else
- udev->removable = USB_DEVICE_FIXED;
+ if (pld.user_visible)
+ usb_set_hub_port_connect_type(hdev, port1,
+ USB_PORT_CONNECT_TYPE_HOT_PLUG);
+ else
+ usb_set_hub_port_connect_type(hdev, port1,
+ USB_PORT_CONNECT_TYPE_HARD_WIRED);
+ else if (!pld.user_visible)
+ usb_set_hub_port_connect_type(hdev, port1, USB_PORT_NOT_USED);
out:
kfree(upc);
return ret;
}
-static int usb_acpi_check_pld(struct usb_device *udev, acpi_handle handle)
-{
- acpi_status status;
- struct acpi_pld pld;
-
- status = acpi_get_physical_device_location(handle, &pld);
-
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- if (pld.user_visible)
- udev->removable = USB_DEVICE_REMOVABLE;
- else
- udev->removable = USB_DEVICE_FIXED;
-
- return 0;
-}
-
static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
{
struct usb_device *udev;
- struct device *parent;
acpi_handle *parent_handle;
-
- if (!is_usb_device(dev))
- return -ENODEV;
-
- udev = to_usb_device(dev);
- parent = dev->parent;
- parent_handle = DEVICE_ACPI_HANDLE(parent);
-
- if (!parent_handle)
- return -ENODEV;
-
- *handle = acpi_get_child(parent_handle, udev->portnum);
-
- if (!*handle)
- return -ENODEV;
+ int port_num;
/*
- * PLD will tell us whether a port is removable to the user or
- * not. If we don't get an answer from PLD (it's not present
- * or it's malformed) then try to infer it from UPC. If a
- * device isn't connectable then it's probably not removable.
+ * 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 (usb_acpi_check_pld(udev, *handle) != 0)
- usb_acpi_check_upc(udev, *handle);
+ 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;
}
static struct acpi_bus_type usb_acpi_bus = {
.bus = &usb_bus_type,
- .find_bridge = NULL,
+ .find_bridge = usb_acpi_find_device,
.find_device = usb_acpi_find_device,
};