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USB: add IAD support to usbfs and sysfs

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USB_IAD: Adds support for USB Interface Association Descriptors.

This patch adds support to the USB host stack for parsing, storing, and
displaying Interface Association Descriptors. In /proc/bus/usb/devices
lines starting with A: show the fields in an IAD. In sysfs if an
interface on a USB device is referenced by an IAD the following files
will be added to the sysfs directory for that interface:
iad_bFirstInterface, iad_bInterfaceCount, iad_bFunctionClass, and
iad_bFunctionSubClass, iad_bFunctionProtocol

Signed-off-by: Craig W. Nadler <craig@nadler.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Craig W. Nadler
2007-06-15 23:14:35 -04:00
committed by Greg Kroah-Hartman
parent 50d2dc7266
commit 165fe97ed6
5 changed files with 116 additions and 0 deletions
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34
drivers/usb/core/sysfs.c
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@@ -495,6 +495,25 @@ void usb_remove_sysfs_dev_files(struct usb_device *udev)
sysfs_remove_group(&dev->kobj, &dev_attr_grp);
}
/* Interface Accociation Descriptor fields */
#define usb_intf_assoc_attr(field, format_string) \
static ssize_t \
show_iad_##field (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct usb_interface *intf = to_usb_interface (dev); \
\
return sprintf (buf, format_string, \
intf->intf_assoc->field); \
} \
static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL);
usb_intf_assoc_attr (bFirstInterface, "%02x\n")
usb_intf_assoc_attr (bInterfaceCount, "%02d\n")
usb_intf_assoc_attr (bFunctionClass, "%02x\n")
usb_intf_assoc_attr (bFunctionSubClass, "%02x\n")
usb_intf_assoc_attr (bFunctionProtocol, "%02x\n")
/* Interface fields */
#define usb_intf_attr(field, format_string) \
static ssize_t \
@@ -558,6 +577,18 @@ static ssize_t show_modalias(struct device *dev,
}
static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
static struct attribute *intf_assoc_attrs[] = {
&dev_attr_iad_bFirstInterface.attr,
&dev_attr_iad_bInterfaceCount.attr,
&dev_attr_iad_bFunctionClass.attr,
&dev_attr_iad_bFunctionSubClass.attr,
&dev_attr_iad_bFunctionProtocol.attr,
NULL,
};
static struct attribute_group intf_assoc_attr_grp = {
.attrs = intf_assoc_attrs,
};
static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceNumber.attr,
&dev_attr_bAlternateSetting.attr,
@@ -609,6 +640,8 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf)
alt->string = usb_cache_string(udev, alt->desc.iInterface);
if (alt->string)
retval = device_create_file(dev, &dev_attr_interface);
if (intf->intf_assoc)
retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
usb_create_intf_ep_files(intf, udev);
return 0;
}
@@ -620,4 +653,5 @@ void usb_remove_sysfs_intf_files(struct usb_interface *intf)
usb_remove_intf_ep_files(intf);
device_remove_file(dev, &dev_attr_interface);
sysfs_remove_group(&dev->kobj, &intf_attr_grp);
sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp);
}