1 files changed, 84 insertions, 0 deletions
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 000000000..23c8e2397
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-rc5.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ImgTec IR Decoder setup for Philips RC-5 protocol.
+ *
+ * Copyright 2012-2014 Imagination Technologies Ltd.
+ */
+
+#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_PROTO_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_PROTO_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,
+};