[media] rc: img-ir: add philips rc5 decoder module

Add img-ir module for decoding Philips rc5 protocol.

Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

5 files changed, 100 insertions, 0 deletions

diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig
index 580715c7fc5e..b20b3e9b441e 100644
--- a/drivers/media/rc/img-ir/Kconfig
+++ b/drivers/media/rc/img-ir/Kconfig
@@ -60,3 +60,10 @@ 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 "Philips 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 92a459d99509..898b1b8086d0 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 5c32f05b32ec..13f0b1e0e211 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 b31ffc947e41..b9e799d57d99 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 000000000000..a8a28a377eee
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-rc5.c
@@ -0,0 +1,88 @@
+/*
+ * ImgTec IR Decoder setup for Philips 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,
+};