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Commit cef7468c authored by Lan Tianyu's avatar Lan Tianyu Committed by Greg Kroah-Hartman
Browse files

usb: Add "portX/connect_type" attribute to expose usb port's connect type 



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: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9f7344fb

Documentation/ABI/testing/sysfs-bus-usb

+9 −0
Original line number Diff line number Diff line
@@ -227,3 +227,12 @@ Contact: Lan Tianyu <tianyu.lan@intel.com> 
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@intel.com>

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.

drivers/usb/core/port.c

+43 −0
Original line number Diff line number Diff line
@@ -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);