kdrive: set "evdev" driver for input devices automatically, if available.

If kdrive input driver "evdev" is available, no other driver was
explicitly set for a given input device, and its kernel device node is
/dev/input/event*, this patch will make kdrive set "evdev" driver
automatically for such device.
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Laércio de Sousa <laerciosousa@sme-mogidascruzes.sp.gov.br>

hw/kdrive/src/kinput.c

@@ -51,6 +51,11 @@
 #include "inpututils.h"
 #include "optionstr.h"
 
+#ifdef KDRIVE_EVDEV
+#define DEV_INPUT_EVENT_PREFIX "/dev/input/event"
+#define DEV_INPUT_EVENT_PREFIX_LEN (sizeof(DEV_INPUT_EVENT_PREFIX) - 1)
+#endif
+
 #define AtomFromName(x) MakeAtom(x, strlen(x), 1)
 
 struct KdConfigDevice {
@@ -1097,6 +1102,16 @@ KdParseKbdOptions(KdKeyboardInfo * ki)
             ErrorF("Kbd option key (%s) of value (%s) not assigned!\n",
                    key, value);
     }
+
+#ifdef KDRIVE_EVDEV
+    if (!ki->driver && ki->path != NULL &&
+        strncasecmp(ki->path,
+                    DEV_INPUT_EVENT_PREFIX,
+                    DEV_INPUT_EVENT_PREFIX_LEN) == 0) {
+            ki->driver = KdFindKeyboardDriver("evdev");
+            ki->options = input_option_new(ki->options, "driver", "evdev");
+    }
+#endif
 }
 
 KdKeyboardInfo *
@@ -1191,6 +1206,16 @@ KdParsePointerOptions(KdPointerInfo * pi)
             ErrorF("Pointer option key (%s) of value (%s) not assigned!\n",
                    key, value);
     }
+
+#ifdef KDRIVE_EVDEV
+    if (!pi->driver && pi->path != NULL &&
+        strncasecmp(pi->path,
+                    DEV_INPUT_EVENT_PREFIX,
+                    DEV_INPUT_EVENT_PREFIX_LEN) == 0) {
+            pi->driver = KdFindPointerDriver("evdev");
+            pi->options = input_option_new(pi->options, "driver", "evdev");
+    }
+#endif
 }
 
 KdPointerInfo *