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| author | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-08-05 10:03:17 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-08-05 10:03:17 -0300 |
| commit | b09fc65be0f74fa20c47c31d00ddf7553a4749ee (patch) | |
| tree | cea70338c9ed3ffb10b271c4e0d5bb2b440faf13 /linux/include | |
| parent | b9ae36cc08d88d25ef5326e857fbea45b7e36588 (diff) | |
| download | mediapointer-dvb-s2-b09fc65be0f74fa20c47c31d00ddf7553a4749ee.tar.gz mediapointer-dvb-s2-b09fc65be0f74fa20c47c31d00ddf7553a4749ee.tar.bz2 | |
saa7134: Add NEC prococol IR decoding capability
From: Mauro Carvalho Chehab <mchehab@infradead.org>
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.
Priority: normal
Signed-off-by: Gilberto <gilberto@sistemafenix.com.br>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'linux/include')
| -rw-r--r-- | linux/include/media/ir-common.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/linux/include/media/ir-common.h b/linux/include/media/ir-common.h index b8e8aa919..f5566d438 100644 --- a/linux/include/media/ir-common.h +++ b/linux/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, |