Some platforms provide usb port connect types through ACPI. This
patch is to add this new attribute to expose these information
to user space.
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-usb | 9 +++++++
drivers/usb/core/port.c | 43 +++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index b6fbe51..c8baaf5 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -227,3 +227,12 @@ Contact: Lan Tianyu <tianyu.lan@xxxxxxxxx>
Description:
The /sys/bus/usb/devices/.../(hub interface)/portX
is usb port device's sysfs directory.
+
+What: /sys/bus/usb/devices/.../(hub interface)/portX/connect_type
+Date: January 2013
+Contact: Lan Tianyu <tianyu.lan@xxxxxxxxx>
+Description:
+ Some platforms provide usb port connect types through ACPI.
+ This attribute is to expose these information to user space.
+ The file will read "hotplug", "wired" and "not used" if the
+ information is available, and "unknown" otherwise.
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 3734850..fe5959f 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -20,6 +20,48 @@
#include "hub.h"
+static const struct attribute_group *port_dev_group[];
+
+static ssize_t show_port_connect_type(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ char *result;
+
+ switch (port_dev->connect_type) {
+ case USB_PORT_CONNECT_TYPE_HOT_PLUG:
+ result = "hotplug";
+ break;
+ case USB_PORT_CONNECT_TYPE_HARD_WIRED:
+ result = "hardwired";
+ break;
+ case USB_PORT_NOT_USED:
+ result = "not used";
+ break;
+ default:
+ result = "unknown";
+ break;
+ }
+
+ return sprintf(buf, "%s\n", result);
+}
+static DEVICE_ATTR(connect_type, S_IRUGO, show_port_connect_type,
+ NULL);
+
+static struct attribute *port_dev_attrs[] = {
+ &dev_attr_connect_type.attr,
+ NULL,
+};
+
+static struct attribute_group port_dev_attr_grp = {
+ .attrs = port_dev_attrs,
+};
+
+static const struct attribute_group *port_dev_group[] = {
+ &port_dev_attr_grp,
+ NULL,
+};
+
static void usb_port_device_release(struct device *dev)
{
struct usb_port *port_dev = to_usb_port(dev);
@@ -45,6 +87,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
hub->ports[port1 - 1] = port_dev;
port_dev->dev.parent = hub->intfdev;
+ port_dev->dev.groups = port_dev_group;
port_dev->dev.type = &usb_port_device_type;
dev_set_name(&port_dev->dev, "port%d", port1);
--
1.7.9.5
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