Input: add match() method to input hanlders

Get rid of blacklist in input handler structure and instead allow
handlers to define their own match() method to perform fine-grained
filtering of supported devices.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 16 insertions, 8 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index cbf64b985ef4..ada25bb8941e 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -1323,6 +1323,21 @@ static void kbd_event(struct input_handle *handle, unsigned int event_type,
         schedule_console_callback();
 }
 
+static bool kbd_match(struct input_handler *handler, struct input_dev *dev)
+{
+        int i;
+
+        if (test_bit(EV_SND, dev->evbit))
+                return true;
+
+        if (test_bit(EV_KEY, dev->evbit))
+                for (i = KEY_RESERVED; i < BTN_MISC; i++)
+                        if (test_bit(i, dev->keybit))
+                                return true;
+
+        return false;
+}
+
 /*
  * When a keyboard (or other input device) is found, the kbd_connect
  * function is called. The function then looks at the device, and if it
@@ -1334,14 +1349,6 @@ static int kbd_connect(struct input_handler *handler, struct input_dev *dev,
 {
         struct input_handle *handle;
         int error;
-        int i;
-
-        for (i = KEY_RESERVED; i < BTN_MISC; i++)
-                if (test_bit(i, dev->keybit))
-                        break;
-
-        if (i == BTN_MISC && !test_bit(EV_SND, dev->evbit))
-                return -ENODEV;
 
         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
         if (!handle)
@@ -1407,6 +1414,7 @@ MODULE_DEVICE_TABLE(input, kbd_ids);
 
 static struct input_handler kbd_handler = {
         .event          = kbd_event,
+        .match          = kbd_match,
         .connect        = kbd_connect,
         .disconnect     = kbd_disconnect,
         .start          = kbd_start,