Input: add input_set_capability() helper

Add input_set_capability() helper used to indicate that an input
device supports a certain event without need to manipulate bitmaps
directly.

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

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 173c2861ec58..915e9ab7cab0 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1046,6 +1046,62 @@ void input_free_device(struct input_dev *dev)
 }
 EXPORT_SYMBOL(input_free_device);
 
+/**
+ * input_set_capability - mark device as capable of a certain event
+ * @dev: device that is capable of emitting or accepting event
+ * @type: type of the event (EV_KEY, EV_REL, etc...)
+ * @code: event code
+ *
+ * In addition to setting up corresponding bit in appropriate capability
+ * bitmap the function also adjusts dev->evbit.
+ */
+void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
+{
+        switch (type) {
+        case EV_KEY:
+                __set_bit(code, dev->keybit);
+                break;
+
+        case EV_REL:
+                __set_bit(code, dev->relbit);
+                break;
+
+        case EV_ABS:
+                __set_bit(code, dev->absbit);
+                break;
+
+        case EV_MSC:
+                __set_bit(code, dev->mscbit);
+                break;
+
+        case EV_SW:
+                __set_bit(code, dev->swbit);
+                break;
+
+        case EV_LED:
+                __set_bit(code, dev->ledbit);
+                break;
+
+        case EV_SND:
+                __set_bit(code, dev->sndbit);
+                break;
+
+        case EV_FF:
+                __set_bit(code, dev->ffbit);
+                break;
+
+        default:
+                printk(KERN_ERR
+                        "input_set_capability: unknown type %u (code %u)\n",
+                        type, code);
+                dump_stack();
+                return;
+        }
+
+        __set_bit(type, dev->evbit);
+}
+EXPORT_SYMBOL(input_set_capability);
+
 int input_register_device(struct input_dev *dev)
 {
         static atomic_t input_no = ATOMIC_INIT(0);