Commit cb9564e1 authored by Sifan Naeem's avatar Sifan Naeem Committed by Mauro Carvalho Chehab
Browse files

[media] rc: img-ir: add philips rc6 decoder module 



Add img-ir module for decoding Philips rc6 protocol.

Signed-off-by: default avatarSifan Naeem <sifan.naeem@imgtec.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent aa7383db

drivers/media/rc/img-ir/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -67,3 +67,11 @@ config IR_IMG_RC5 
	help

	   Say Y here to enable support for the RC5 protocol in the ImgTec

	   infrared decoder block.



config IR_IMG_RC6

	bool "Philips RC6 protocol support"

	depends on IR_IMG_HW

	help

	   Say Y here to enable support for the RC6 protocol in the ImgTec

	   infrared decoder block.

	   Note: This version only supports mode 0.

drivers/media/rc/img-ir/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 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-$(CONFIG_IR_IMG_RC6)	+= img-ir-rc6.o

img-ir-objs			:= $(img-ir-y)



obj-$(CONFIG_IR_IMG)		+= img-ir.o

drivers/media/rc/img-ir/img-ir-hw.c

+3 −0
Original line number Diff line number Diff line
@@ -44,6 +44,9 @@ static struct img_ir_decoder *img_ir_decoders[] = { 
#endif

#ifdef CONFIG_IR_IMG_RC5

	&img_ir_rc5,

#endif

#ifdef CONFIG_IR_IMG_RC6

	&img_ir_rc6,

#endif

	NULL

};

drivers/media/rc/img-ir/img-ir-hw.h

+1 −0
Original line number Diff line number Diff line
@@ -188,6 +188,7 @@ 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;

extern struct img_ir_decoder img_ir_rc6;



/**

 * struct img_ir_reg_timings - Reg values for decoder timings at clock rate.

drivers/media/rc/img-ir/img-ir-rc6.c

0 → 100644
+117 −0
Original line number Diff line number Diff line 
/*

 * ImgTec IR Decoder setup for Philips RC-6 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 RC6 data to a scancode */

static int img_ir_rc6_scancode(int len, u64 raw, u64 enabled_protocols,

				struct img_ir_scancode_req *request)

{

	unsigned int addr, cmd, mode, trl1, trl2;



	/*

	 * Due to a side effect of the decoder handling the double length

	 * Trailer bit, the header information is a bit scrambled, and the

	 * raw data is shifted incorrectly.

	 * This workaround effectively recovers the header bits.

	 *

	 * The Header field should look like this:

	 *

	 * StartBit ModeBit2 ModeBit1 ModeBit0 TrailerBit

	 *

	 * But what we get is:

	 *

	 * ModeBit2 ModeBit1 ModeBit0 TrailerBit1 TrailerBit2

	 *

	 * The start bit is not important to recover the scancode.

	 */



	raw	>>= 27;



	trl1	= (raw >>  17)	& 0x01;

	trl2	= (raw >>  16)	& 0x01;



	mode	= (raw >>  18)	& 0x07;

	addr	= (raw >>   8)	& 0xff;

	cmd	=  raw		& 0xff;



	/*

	 * Due to the above explained irregularity the trailer bits cannot

	 * have the same value.

	 */

	if (trl1 == trl2)

		return -EINVAL;



	/* Only mode 0 supported for now */

	if (mode)

		return -EINVAL;



	request->protocol = RC_TYPE_RC6_0;

	request->scancode = addr << 8 | cmd;

	request->toggle	  = trl2;

	return IMG_IR_SCANCODE;

}



/* Convert RC6 scancode to RC6 data filter */

static int img_ir_rc6_filter(const struct rc_scancode_filter *in,

				 struct img_ir_filter *out, u64 protocols)

{

	/* Not supported by the hw. */

	return -EINVAL;

}



/*

 * RC-6 decoder

 * see http://www.sbprojects.com/knowledge/ir/rc6.php

 */

struct img_ir_decoder img_ir_rc6 = {

	.type		= RC_BIT_RC6_0,

	.control	= {

		.bitorien	= 1,

		.code_type	= IMG_IR_CODETYPE_BIPHASE,

		.decoden	= 1,

		.decodinpol	= 1,

	},

	/* main timings */

	.tolerance	= 20,

	/*

	 * Due to a quirk in the img-ir decoder, default header values do

	 * not work, the values described below were extracted from

	 * successful RTL test cases.

	 */

	.timings	= {

		/* leader symbol */

		.ldr = {

			.pulse	= { 650 },

			.space	= { 660 },

		},

		/* 0 symbol */

		.s00 = {

			.pulse	= { 370 },

			.space	= { 370 },

		},

		/* 01 symbol */

		.s01 = {

			.pulse	= { 370 },

			.space	= { 370 },

		},

		/* free time */

		.ft  = {

			.minlen = 21,

			.maxlen = 21,

			.ft_min = 2666,	/* 2.666 ms */

		},

	},



	/* scancode logic */

	.scancode	= img_ir_rc6_scancode,

	.filter		= img_ir_rc6_filter,

};