Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...

[mv-sheeva.git] / drivers / usb / core / sysfs.c

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 2ab222be8fd164f58bff7245005ab4f621433a1d..32bd130b1eed33fc542fc39bc5f10c1de4695916 100644 (file)
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -169,6 +169,16 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
 
+static ssize_t
+show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct usb_device *udev;
+
+       udev = to_usb_device(dev);
+       return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
+}
+static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
+
 
 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND)
 static const char power_group[] = "power";
@@ -413,6 +423,44 @@ 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,
@@ -420,6 +468,7 @@ static struct attribute *dev_attrs[] = {
        &dev_attr_bConfigurationValue.attr,
        &dev_attr_bmAttributes.attr,
        &dev_attr_bMaxPower.attr,
+       &dev_attr_urbnum.attr,
        /* device attributes */
        &dev_attr_idVendor.attr,
        &dev_attr_idProduct.attr,
@@ -435,6 +484,7 @@ 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 = {
@@ -685,6 +735,8 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf)
        struct usb_host_interface *alt = intf->cur_altsetting;
        int retval;
 
+       if (intf->sysfs_files_created)
+               return 0;
        retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
        if (retval)
                return retval;
@@ -696,6 +748,7 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf)
        if (intf->intf_assoc)
                retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
        usb_create_intf_ep_files(intf, udev);
+       intf->sysfs_files_created = 1;
        return 0;
 }
 
@@ -703,8 +756,11 @@ void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 {
        struct device *dev = &intf->dev;
 
+       if (!intf->sysfs_files_created)
+               return;
        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);
+       intf->sysfs_files_created = 0;
 }