linux-kernel - [PATCH] media: sharp: fix sharp encoding

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Date:   Fri,  6 Oct 2023 14:26:30 +0100
From:   Sean Young <sean@...s.org>
To:     linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Joe Ferner <joe.m.ferner@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] media: sharp: fix sharp encoding

The Sharp protocol[1] encoding has incorrect timings for bit space.

[1] https://www.sbprojects.net/knowledge/ir/sharp.php

Reported-by: Joe Ferner <joe.m.ferner@...il.com>
Closes: https://sourceforge.net/p/lirc/mailman/message/38604507/
Signed-off-by: Sean Young <sean@...s.org>
---
 drivers/media/rc/ir-sharp-decoder.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/media/rc/ir-sharp-decoder.c b/drivers/media/rc/ir-sharp-decoder.c
index 3d8488c39c56..3311099cbd57 100644
--- a/drivers/media/rc/ir-sharp-decoder.c
+++ b/drivers/media/rc/ir-sharp-decoder.c
@@ -15,7 +15,9 @@
 #define SHARP_UNIT		40  /* us */
 #define SHARP_BIT_PULSE		(8    * SHARP_UNIT) /* 320us */
 #define SHARP_BIT_0_PERIOD	(25   * SHARP_UNIT) /* 1ms (680us space) */
-#define SHARP_BIT_1_PERIOD	(50   * SHARP_UNIT) /* 2ms (1680ms space) */
+#define SHARP_BIT_1_PERIOD	(50   * SHARP_UNIT) /* 2ms (1680us space) */
+#define SHARP_BIT_0_SPACE	(17   * SHARP_UNIT) /* 680us space */
+#define SHARP_BIT_1_SPACE	(42   * SHARP_UNIT) /* 1680us space */
 #define SHARP_ECHO_SPACE	(1000 * SHARP_UNIT) /* 40 ms */
 #define SHARP_TRAILER_SPACE	(125  * SHARP_UNIT) /* 5 ms (even longer) */
 
@@ -168,8 +170,8 @@ static const struct ir_raw_timings_pd ir_sharp_timings = {
 	.header_pulse  = 0,
 	.header_space  = 0,
 	.bit_pulse     = SHARP_BIT_PULSE,
-	.bit_space[0]  = SHARP_BIT_0_PERIOD,
-	.bit_space[1]  = SHARP_BIT_1_PERIOD,
+	.bit_space[0]  = SHARP_BIT_0_SPACE,
+	.bit_space[1]  = SHARP_BIT_1_SPACE,
 	.trailer_pulse = SHARP_BIT_PULSE,
 	.trailer_space = SHARP_ECHO_SPACE,
 	.msb_first     = 1,
-- 
2.42.0