Input: xen-kbdfront - use string constants from PV protocol

Xen input para-virtual protocol defines string constants
used by both back and frontend. Use those instead of
explicit strings in the frontend driver.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 690148f9940ed009c671aca3c37ac51b175bd7d9..eb770613a9bd847930cf295aff81e25a6673d3f1 100644 (file)
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -135,14 +135,17 @@ static int xenkbd_probe(struct xenbus_device *dev,
                goto error_nomem;
 
        /* Set input abs params to match backend screen res */
-       abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0);
-       ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend, "width",
+       abs = xenbus_read_unsigned(dev->otherend,
+                                  XENKBD_FIELD_FEAT_ABS_POINTER, 0);
+       ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
+                                                 XENKBD_FIELD_WIDTH,
                                                  ptr_size[KPARAM_X]);
-       ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend, "height",
+       ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
+                                                 XENKBD_FIELD_HEIGHT,
                                                  ptr_size[KPARAM_Y]);
        if (abs) {
                ret = xenbus_write(XBT_NIL, dev->nodename,
-                                  "request-abs-pointer", "1");
+                                  XENKBD_FIELD_REQ_ABS_POINTER, "1");
                if (ret) {
                        pr_warn("xenkbd: can't request abs-pointer\n");
                        abs = 0;
@@ -271,14 +274,15 @@ static int xenkbd_connect_backend(struct xenbus_device *dev,
                xenbus_dev_fatal(dev, ret, "starting transaction");
                goto error_irqh;
        }
-       ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
+       ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_REF, "%lu",
                            virt_to_gfn(info->page));
        if (ret)
                goto error_xenbus;
-       ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref);
+       ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_GREF,
+                           "%u", info->gref);
        if (ret)
                goto error_xenbus;
-       ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
+       ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_EVT_CHANNEL, "%u",
                            evtchn);
        if (ret)
                goto error_xenbus;
@@ -353,7 +357,7 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
 }
 
 static const struct xenbus_device_id xenkbd_ids[] = {
-       { "vkbd" },
+       { XENKBD_DRIVER_NAME },
        { "" }
 };
 
@@ -390,4 +394,4 @@ module_exit(xenkbd_cleanup);
 
 MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS("xen:vkbd");
+MODULE_ALIAS("xen:" XENKBD_DRIVER_NAME);