[PATCH 4/5] rc: img-ir: add philips rc5 decoder module
From: Sifan Naeem
Date: Thu Dec 04 2014 - 10:40:49 EST
Add img-ir module for decoding Philips rc5 protocol.
Signed-off-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
---
drivers/media/rc/img-ir/Kconfig | 7 +++
drivers/media/rc/img-ir/Makefile | 1 +
drivers/media/rc/img-ir/img-ir-hw.c | 3 ++
drivers/media/rc/img-ir/img-ir-hw.h | 1 +
drivers/media/rc/img-ir/img-ir-rc5.c | 88 ++++++++++++++++++++++++++++++++++
5 files changed, 100 insertions(+)
create mode 100644 drivers/media/rc/img-ir/img-ir-rc5.c
diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig
index 03ba9fc..b5b114f 100644
--- a/drivers/media/rc/img-ir/Kconfig
+++ b/drivers/media/rc/img-ir/Kconfig
@@ -59,3 +59,10 @@ config IR_IMG_SANYO
help
Say Y here to enable support for the Sanyo protocol (used by Sanyo,
Aiwa, Chinon remotes) in the ImgTec infrared decoder block.
+
+config IR_IMG_RC5
+ bool "Phillips RC5 protocol support"
+ depends on IR_IMG_HW
+ help
+ Say Y here to enable support for the RC5 protocol in the ImgTec
+ infrared decoder block.
diff --git a/drivers/media/rc/img-ir/Makefile b/drivers/media/rc/img-ir/Makefile
index 92a459d..898b1b8 100644
--- a/drivers/media/rc/img-ir/Makefile
+++ b/drivers/media/rc/img-ir/Makefile
@@ -6,6 +6,7 @@ img-ir-$(CONFIG_IR_IMG_JVC) += img-ir-jvc.o
img-ir-$(CONFIG_IR_IMG_SONY) += img-ir-sony.o
img-ir-$(CONFIG_IR_IMG_SHARP) += img-ir-sharp.o
img-ir-$(CONFIG_IR_IMG_SANYO) += img-ir-sanyo.o
+img-ir-$(CONFIG_IR_IMG_RC5) += img-ir-rc5.o
img-ir-objs := $(img-ir-y)
obj-$(CONFIG_IR_IMG) += img-ir.o
diff --git a/drivers/media/rc/img-ir/img-ir-hw.c b/drivers/media/rc/img-ir/img-ir-hw.c
index a977467..322cdf8 100644
--- a/drivers/media/rc/img-ir/img-ir-hw.c
+++ b/drivers/media/rc/img-ir/img-ir-hw.c
@@ -42,6 +42,9 @@ static struct img_ir_decoder *img_ir_decoders[] = {
#ifdef CONFIG_IR_IMG_SANYO
&img_ir_sanyo,
#endif
+#ifdef CONFIG_IR_IMG_RC5
+ &img_ir_rc5,
+#endif
NULL
};
diff --git a/drivers/media/rc/img-ir/img-ir-hw.h b/drivers/media/rc/img-ir/img-ir-hw.h
index 8578aa7..f124ec5 100644
--- a/drivers/media/rc/img-ir/img-ir-hw.h
+++ b/drivers/media/rc/img-ir/img-ir-hw.h
@@ -187,6 +187,7 @@ extern struct img_ir_decoder img_ir_jvc;
extern struct img_ir_decoder img_ir_sony;
extern struct img_ir_decoder img_ir_sharp;
extern struct img_ir_decoder img_ir_sanyo;
+extern struct img_ir_decoder img_ir_rc5;
/**
* struct img_ir_reg_timings - Reg values for decoder timings at clock rate.
diff --git a/drivers/media/rc/img-ir/img-ir-rc5.c b/drivers/media/rc/img-ir/img-ir-rc5.c
new file mode 100644
index 0000000..e1a0829
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-rc5.c
@@ -0,0 +1,88 @@
+/*
+ * ImgTec IR Decoder setup for Phillips RC-5 protocol.
+ *
+ * Copyright 2012-2014 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include "img-ir-hw.h"
+
+/* Convert RC5 data to a scancode */
+static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols,
+ struct img_ir_scancode_req *request)
+{
+ unsigned int addr, cmd, tgl, start;
+
+ /* Quirk in the decoder shifts everything by 2 to the left. */
+ raw >>= 2;
+
+ start = (raw >> 13) & 0x01;
+ tgl = (raw >> 11) & 0x01;
+ addr = (raw >> 6) & 0x1f;
+ cmd = raw & 0x3f;
+ /*
+ * 12th bit is used to extend the command in extended RC5 and has
+ * no effect on standard RC5.
+ */
+ cmd += ((raw >> 12) & 0x01) ? 0 : 0x40;
+
+ if (!start)
+ return -EINVAL;
+
+ request->protocol = RC_TYPE_RC5;
+ request->scancode = addr << 8 | cmd;
+ request->toggle = tgl;
+ return IMG_IR_SCANCODE;
+}
+
+/* Convert RC5 scancode to RC5 data filter */
+static int img_ir_rc5_filter(const struct rc_scancode_filter *in,
+ struct img_ir_filter *out, u64 protocols)
+{
+ /* Not supported by the hw. */
+ return -EINVAL;
+}
+
+/*
+ * RC-5 decoder
+ * see http://www.sbprojects.com/knowledge/ir/rc5.php
+ */
+struct img_ir_decoder img_ir_rc5 = {
+ .type = RC_BIT_RC5,
+ .control = {
+ .bitoriend2 = 1,
+ .code_type = IMG_IR_CODETYPE_BIPHASE,
+ .decodend2 = 1,
+ },
+ /* main timings */
+ .tolerance = 16,
+ .unit = 888888, /* 1/36k*32=888.888microseconds */
+ .timings = {
+ /* 10 symbol */
+ .s10 = {
+ .pulse = { 1 },
+ .space = { 1 },
+ },
+
+ /* 11 symbol */
+ .s11 = {
+ .pulse = { 1 },
+ .space = { 1 },
+ },
+
+ /* free time */
+ .ft = {
+ .minlen = 14,
+ .maxlen = 14,
+ .ft_min = 5,
+ },
+ },
+
+ /* scancode logic */
+ .scancode = img_ir_rc5_scancode,
+ .filter = img_ir_rc5_filter,
+};
--
1.7.9.5
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