V4L/DVB: ir-core: dynamically load the compiled IR protocols

Instead of hardcoding the protocols into ir-core, add a register interface
for the IR protocol decoders, and convert ir-nec-decoder into a client of
ir-core.

With this approach, it is possible to dynamically load the needed IR protocols,
and to add a RAW IR interface module, registered as one IR raw protocol decoder.

This patch opens a way to register a lirc_dev interface to work as an userspace
IR protocol decoder.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 29 insertions, 6 deletions

diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c
index 104482a6991e..c9a986dd57fd 100644
--- a/drivers/media/IR/ir-nec-decoder.c
+++ b/drivers/media/IR/ir-nec-decoder.c
@@ -1,4 +1,4 @@
-/* ir-raw-event.c - handle IR Pulse/Space event
+/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
  *
  * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
  *
@@ -147,7 +147,7 @@ static int __ir_nec_decode(struct input_dev *input_dev,
                 if (++count == 32)
                         break;
         }
-        *pos++;
+        (*pos)++;
 
         /*
          * Fixme: may need to accept Extended NEC protocol?
@@ -181,9 +181,9 @@ err:
  * This function returns the number of decoded pulses or -EINVAL if no
  * pulse got decoded
  */
-int ir_nec_decode(struct input_dev *input_dev,
-                           struct ir_raw_event *evs,
-                           int len)
+static int ir_nec_decode(struct input_dev *input_dev,
+                         struct ir_raw_event *evs,
+                         int len)
 {
         int pos = 0;
         int rc = 0;
@@ -198,4 +198,27 @@ int ir_nec_decode(struct input_dev *input_dev,
         return rc;
 }
 
-EXPORT_SYMBOL_GPL(ir_nec_decode);
+static struct ir_raw_handler nec_handler = {
+        .decode = ir_nec_decode,
+};
+
+static int __init ir_nec_decode_init(void)
+{
+        ir_raw_handler_register(&nec_handler);
+
+        printk(KERN_INFO "IR NEC protocol handler initialized\n");
+        return 0;
+}
+
+static void __exit ir_nec_decode_exit(void)
+{
+        ir_raw_handler_unregister(&nec_handler);
+}
+
+module_init(ir_nec_decode_init);
+module_exit(ir_nec_decode_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
+MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
+MODULE_DESCRIPTION("NEC IR protocol decoder");