USB: let both new_id and remove_id show dynamic id list

This enables the current list of dynamic IDs to be read out through
either new_id or remove_id.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 7c22a532fdfb..6ae9fec8e07d 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -135,6 +135,17 @@ Description:
                 for the device and attempt to bind to it.  For example:
                 # echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id
 
+                Reading from this file will list all dynamically added
+                device IDs in the same format, with one entry per
+                line. For example:
+                # cat /sys/bus/usb/drivers/foo/new_id
+                8086 10f5
+                dead beef 06
+                f00d cafe
+
+                The list will be truncated at PAGE_SIZE bytes due to
+                sysfs restrictions.
+
 What:           /sys/bus/usb-serial/drivers/.../new_id
 Date:           October 2011
 Contact:        linux-usb@vger.kernel.org
@@ -157,6 +168,10 @@ Description:
                 match the driver to the device.  For example:
                 # echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
 
+                Reading from this file will list the dynamically added
+                device IDs, exactly like reading from the entry
+                "/sys/bus/usb/drivers/.../new_id"
+
 What:           /sys/bus/usb/device/.../avoid_reset_quirk
 Date:           December 2009
 Contact:        Oliver Neukum <oliver@neukum.org>