Change since v5: Fix code and comment type error.
Change since v4: Remove some redundant kerneldocs and fix typo.
Change since v3: Rebase on the patch "make usb port a real device"
Check the connect type of usb port when getting the usb port's
acpi_handle and store result into connect_type in the struct
usb_port.
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.
When a device was found on the port, if the connect_type was hot-plug,
then the device would be removable. If the connect_type was hard-wired,
the device would be non-removable.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/usb/core/hub.c | 31 ++++++++++++++++
drivers/usb/core/usb-acpi.c | 80 ++++++++++++++++++++++++-------------------
drivers/usb/core/usb.h | 4 ++
include/linux/usb.h | 7 ++++
4 files changed, 87 insertions(+), 35 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 58b3aaf..25dfd71 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -41,6 +41,7 @@ struct usb_port {
struct usb_device *child;
struct device dev;
struct dev_state *port_owner;
+ enum usb_port_connect_type connect_type;
};
struct usb_hub {
@@ -4989,6 +4990,36 @@ struct usb_device *usb_hub_find_child(struct usb_device *hdev,
}
EXPORT_SYMBOL_GPL(usb_hub_find_child);
+/**
+ * usb_set_hub_port_connect_type - set hub port connect type.
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num of the port
+ * @type: connect type of the port
+ */
+void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
+ enum usb_port_connect_type type)
+{
+ struct usb_hub *hub = hdev_to_hub(hdev);
+
+ hub->ports[port1 - 1]->connect_type = type;
+}
+
+/**
+ * usb_get_hub_port_connect_type - Get the port's connect type
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num of the port
+ *
+ * Return connect type of the port and if input params are
+ * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
+ */
+enum usb_port_connect_type
+usb_get_hub_port_connect_type(struct usb_device *hdev, int port1)
+{
+ struct usb_hub *hub = hdev_to_hub(hdev);
+
+ return hub->ports[port1 - 1]->connect_type;
+}
+
#ifdef CONFIG_ACPI
/**
* usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index 47197bf..404d86a 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -19,20 +19,29 @@
#include "usb.h"
-static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle)
+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;
@@ -40,33 +49,20 @@ 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;
@@ -88,8 +84,30 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
*/
if (is_usb_device(dev)) {
udev = to_usb_device(dev);
- if (udev->parent)
+ 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);
@@ -122,18 +140,10 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
if (!*handle)
return -ENODEV;
}
+ usb_acpi_check_port_connect_type(udev, *handle, port_num);
} else
return -ENODEV;
- /*
- * 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.
- */
- if (usb_acpi_check_pld(udev, *handle) != 0)
- usb_acpi_check_upc(udev, *handle);
-
return 0;
}
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 4aa20f4..bbd7df4 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -168,6 +168,10 @@ extern void usb_notify_add_device(struct usb_device *udev);
extern void usb_notify_remove_device(struct usb_device *udev);
extern void usb_notify_add_bus(struct usb_bus *ubus);
extern void usb_notify_remove_bus(struct usb_bus *ubus);
+extern enum usb_port_connect_type
+ usb_get_hub_port_connect_type(struct usb_device *hdev, int port1);
+extern void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
+ enum usb_port_connect_type type);
#ifdef CONFIG_ACPI
extern int usb_acpi_register(void);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index df3120f..0fc5e03 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -378,6 +378,13 @@ enum usb_device_removable {
USB_DEVICE_FIXED,
};
+enum usb_port_connect_type {
+ USB_PORT_CONNECT_TYPE_UNKNOWN = 0,
+ USB_PORT_CONNECT_TYPE_HOT_PLUG,
+ USB_PORT_CONNECT_TYPE_HARD_WIRED,
+ USB_PORT_NOT_USED,
+};
+
/*
* USB 3.0 Link Power Management (LPM) parameters.
*
--
1.7.6.rc2.8.g28eb
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