[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>

diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig
index 580715c7fc5e4a77c8277a32e8af7719ffde6da3..b20b3e9b441e522064231b58413965234741d0c8 100644 (file)
--- 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 92a459d99509ff1926cb793e1a8a1b0c39e51321..898b1b8086d05ea92732f1d697cc89dcf791c0c6 100644 (file)
--- 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 5c32f05b32ec60f2268ea07aedc9cd1afa02b4d9..13f0b1e0e211d12c655133d9bdc82bb96ec0c4ad 100644 (file)
--- a/drivers/media/rc/img-ir/img-ir-hw.c
+++ b/drivers/media/rc/img-ir/img-ir-hw.c
@@ -41,6 +41,9 @@ static struct img_ir_decoder *img_ir_decoders[] = {
 #endif
 #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 b31ffc947e4120d261758178dc80778e977e67e0..b9e799d57d9938420c2697c682397db60c5c9e7b 100644 (file)
--- 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 (file)
index 0000000..a8a28a3
--- /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,
+};