USB: add read support to usb-serial/../new_id
Keep the usb-serial support for dynamic IDs in sync with the usb
support. This enables readout of dynamic device IDs for
usb-serial drivers. Common code is exported from the usb core
system and reused by the usb-serial bus driver.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index ed8adb0..f398d1e 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -124,8 +124,15 @@
return retval;
}
+static ssize_t show_dynids(struct device_driver *driver, char *buf)
+{
+ struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
+
+ return usb_show_dynids(&usb_drv->dynids, buf);
+}
+
static struct driver_attribute drv_attrs[] = {
- __ATTR(new_id, S_IWUSR, NULL, store_new_id),
+ __ATTR(new_id, S_IRUGO | S_IWUSR, show_dynids, store_new_id),
__ATTR_NULL,
};