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Date: Mon, 8 Dec 2014 17:41:16 +0000
From: James Hogan <james.hogan@...tec.com>
To: Sifan Naeem <sifan.naeem@...tec.com>, <mchehab@....samsung.com>
CC: <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
<james.hartley@...tec.com>, <ezequiel.garcia@...tec.com>
Subject: Re: [PATCH 4/5] rc: img-ir: add philips rc5 decoder module
On 04/12/14 15:38, Sifan Naeem wrote:
> Add img-ir module for decoding Philips rc5 protocol.
>
> Signed-off-by: Sifan Naeem <sifan.naeem@...tec.com>
> ---
> 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"
I think that should be "Philips" (if wikipedia is anything to go by).
Same elsewhere in this patch and patch 5.
Other than that,
Acked-by: James Hogan <james.hogan@...tec.com>
(Note, I don't have RC-5/RC-6 capable hardware yet so can't test this
support)
Thanks
James
> + 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,
> +};
>
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