V4L/DVB (8625): saa7134: Add NEC prococol IR decoding capability

This patch adds the capability of decoding NEC protocol, received via GPIO18 line.
This GPIO port can trigger saa7134 IRQ.

A future improvement would be to make it a little more generic to work also
with GPIO16 line.

A pure IRQ code didn't work, since some delays were introduced on the tests we
did.

A possible approach would be to use polling at a rate of 2.5 ms or less. If a
new code were taken, a code similar to nec_task() could be used. However, this
would add an extra overhead to kernel, and will consume more power.

Due to that, we took an hybrid approach: an IRQ upper half to trigger when a
new key is received and a bottom half to convert pulse-distance into a keycode.

The bottom half is polling based, to improve performance. During the bottom
half proccess, GPIO18 IRQ line is disabled, preventing IRQ reentrancy and
improving performance a little bit.

Thanks to Sistema Fenix (http://www.sistemafenix.com.br/) for sponsoring this
development.

Signed-off-by: Gilberto <gilberto@sistemafenix.com.br>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/media/ir-common.h b/include/media/ir-common.h
index b8e8aa91905a..f5566d43894c 100644
--- a/include/media/ir-common.h
+++ b/include/media/ir-common.h
@@ -25,6 +25,7 @@
 
 #include <linux/input.h>
 #include <linux/workqueue.h>
+#include <linux/interrupt.h>
 
 #define IR_TYPE_RC5     1
 #define IR_TYPE_PD      2 /* Pulse distance encoded IR */
@@ -85,6 +86,10 @@ struct card_ir {
         u32 code;                       /* raw code under construction */
         struct timeval base_time;       /* time of last seen code */
         int active;                     /* building raw code */
+
+        /* NEC decoding */
+        u32                     nec_gpio;
+        struct tasklet_struct   tlet;
 };
 
 void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,