Commit e03f2e8a authored by Inaky Perez-Gonzalez's avatar Inaky Perez-Gonzalez Committed by Greg Kroah-Hartman
Browse files

usb: hook up device authorization to sysfs 



Makes it possible to control the authorization of USB devices through
sysfs's /sys/usb/devices/*/authorize.

Update: per Adrian Bunk's suggestion, make dev_attr_authorized_default static

Signed-off-by: default avatarInaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 93993a0a

drivers/usb/core/sysfs.c

+39 −0
Original line number Diff line number Diff line
@@ -413,6 +413,44 @@ usb_descriptor_attr(bDeviceProtocol, "%02x\n") 
usb_descriptor_attr(bNumConfigurations, "%d\n")

usb_descriptor_attr(bMaxPacketSize0, "%d\n")







/* show if the device is authorized (1) or not (0) */

static ssize_t usb_dev_authorized_show(struct device *dev,

				       struct device_attribute *attr,

				       char *buf)

{

	struct usb_device *usb_dev = to_usb_device(dev);

	return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);

}





/*

 * Authorize a device to be used in the system

 *

 * Writing a 0 deauthorizes the device, writing a 1 authorizes it.

 */

static ssize_t usb_dev_authorized_store(struct device *dev,

					struct device_attribute *attr,

					const char *buf, size_t size)

{

	ssize_t result;

	struct usb_device *usb_dev = to_usb_device(dev);

	unsigned val;

	result = sscanf(buf, "%u\n", &val);

	if (result != 1)

		result = -EINVAL;

	else if (val == 0)

		result = usb_deauthorize_device(usb_dev);

	else

		result = usb_authorize_device(usb_dev);

	return result < 0? result : size;

}



static DEVICE_ATTR(authorized, 0644,

	    usb_dev_authorized_show, usb_dev_authorized_store);





static struct attribute *dev_attrs[] = {

	/* current configuration's attributes */

	&dev_attr_configuration.attr,
@@ -435,6 +473,7 @@ static struct attribute *dev_attrs[] = { 
	&dev_attr_version.attr,

	&dev_attr_maxchild.attr,

	&dev_attr_quirks.attr,

	&dev_attr_authorized.attr,

	NULL,

};

static struct attribute_group dev_attr_grp = {