From 793cf9e6a54c698e109a599c8b8e303658fcaae6 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Date: Fri, 9 Sep 2005 13:03:37 -0700
Subject: [PATCH] v4l: common part Updates and tuner additions

- Remove $Id CVS logs for V4L files
- Included newer cards.
- Added a new NEC protocol for ir based on pulse distance.
- Enable ATSC support for DViCO FusionHDTV5 Gold.
- Added tuner LG NTSC (TALN mini series).
- Fixed tea5767 autodetection.
- Resolve more tuner types.
- Commented debug function removed from mainstream.
- Remove comments from mainstream. Still on development tree.
- linux/version dependencies removed.
- BTSC Lang1 now is set to auto_stereo mode.
- New tuner standby API.
- i2c-core.c uses hexadecimal for the i2c address, so it should stay consistent.

Signed-off-by: Uli Luckas <luckas@musoft.de>
Signed-off-by: Mac Michaels <wmichaels1@earthlink.net>
Signed-off-by: Michael Krufky <mkrufky@m1k.net>
Signed-off-by: Hermann Pitton <hermann.pitton@onlinehome.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 drivers/media/common/ir-common.c | 68 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 67 insertions(+), 1 deletion(-)

(limited to 'drivers/media/common/ir-common.c')

diff --git a/drivers/media/common/ir-common.c b/drivers/media/common/ir-common.c
index ab7a1fba4427..a0e700d7a4a4 100644
--- a/drivers/media/common/ir-common.c
+++ b/drivers/media/common/ir-common.c
@@ -1,5 +1,4 @@
 /*
- * $Id: ir-common.c,v 1.11 2005/07/07 14:44:43 mchehab Exp $
  *
  * some common structs and functions to handle infrared remotes via
  * input layer ...
@@ -335,6 +334,72 @@ int ir_dump_samples(u32 *samples, int count)
 	return 0;
 }
 
+/* decode raw samples, pulse distance coding used by NEC remotes */
+int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
+{
+	int i,last,bit,len;
+	u32 curBit;
+	u32 value;
+
+	/* find start burst */
+	for (i = len = 0; i < count * 32; i++) {
+		bit = getbit(samples,i);
+		if (bit) {
+			len++;
+		} else {
+			if (len >= 29)
+				break;
+			len = 0;
+		}
+	}
+
+	/* start burst to short */
+	if (len < 29)
+		return 0xffffffff;
+
+	/* find start silence */
+	for (len = 0; i < count * 32; i++) {
+		bit = getbit(samples,i);
+		if (bit) {
+			break;
+		} else {
+			len++;
+		}
+	}
+
+	/* silence to short */
+	if (len < 7)
+		return 0xffffffff;
+
+	/* go decoding */
+	len   = 0;
+	last = 1;
+	value = 0; curBit = 1;
+	for (; i < count * 32; i++) {
+		bit  = getbit(samples,i);
+		if (last) {
+			if(bit) {
+				continue;
+			} else {
+				len = 1;
+			}
+		} else {
+			if (bit) {
+				if (len > (low + high) /2)
+					value |= curBit;
+				curBit <<= 1;
+				if (curBit == 1)
+					break;
+			} else {
+				len++;
+			}
+		}
+		last = bit;
+	}
+
+	return value;
+}
+
 /* decode raw samples, biphase coding, used by rc5 for example */
 int ir_decode_biphase(u32 *samples, int count, int low, int high)
 {
@@ -383,6 +448,7 @@ EXPORT_SYMBOL_GPL(ir_input_keydown);
 EXPORT_SYMBOL_GPL(ir_extract_bits);
 EXPORT_SYMBOL_GPL(ir_dump_samples);
 EXPORT_SYMBOL_GPL(ir_decode_biphase);
+EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
 
 /*
  * Local variables:
-- 
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