[PATCHv2] Add ir-rcmm-driver

From: Patrick LERDA <patrick9876@free.fr>

---
 drivers/media/rc/Kconfig           |  10 ++
 drivers/media/rc/Makefile          |   1 +
 drivers/media/rc/ir-rcmm-decoder.c | 185 +++++++++++++++++++++++++++++
 drivers/media/rc/rc-core-priv.h    |   5 +
 drivers/media/rc/rc-main.c         |   3 +
 include/media/rc-map.h             |   6 +-
 include/uapi/linux/lirc.h          |   1 +
 tools/include/uapi/linux/lirc.h    |   1 +
 8 files changed, 210 insertions(+), 2 deletions(-)
 create mode 100644 drivers/media/rc/ir-rcmm-decoder.c
  

On Wed, Dec 05, 2018 at 01:29:33AM +0100, patrick9876@free.fr wrote:
> From: Patrick LERDA <patrick9876@free.fr>
> 

We need a Signed-off-by: here.

https://www.kernel.org/doc/html/v4.12/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin

> ---
>  drivers/media/rc/Kconfig           |  10 ++
>  drivers/media/rc/Makefile          |   1 +
>  drivers/media/rc/ir-rcmm-decoder.c | 185 +++++++++++++++++++++++++++++
>  drivers/media/rc/rc-core-priv.h    |   5 +
>  drivers/media/rc/rc-main.c         |   3 +
>  include/media/rc-map.h             |   6 +-
>  include/uapi/linux/lirc.h          |   1 +
>  tools/include/uapi/linux/lirc.h    |   1 +
>  8 files changed, 210 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/media/rc/ir-rcmm-decoder.c
> 
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index 1021c08a9ba4..b7e08324b874 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -133,6 +133,16 @@ config IR_IMON_DECODER
>  	   remote control and you would like to use it with a raw IR
>  	   receiver, or if you wish to use an encoder to transmit this IR.
>  
> +config IR_RCMM_DECODER
> +	tristate "Enable IR raw decoder for the RC-MM protocol"
> +	depends on RC_CORE
> +	select BITREVERSE

You're not using bitreverse, so don't depend on it.

> +	default y
> +
> +	---help---
> +	   Enable this option if you have IR with RC-MM protocol, and
> +	   if the IR is decoded in software
> +
>  endif #RC_DECODERS
>  
>  menuconfig RC_DEVICES
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index e0340d043fe8..fc4058013234 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_IR_SHARP_DECODER) += ir-sharp-decoder.o
>  obj-$(CONFIG_IR_MCE_KBD_DECODER) += ir-mce_kbd-decoder.o
>  obj-$(CONFIG_IR_XMP_DECODER) += ir-xmp-decoder.o
>  obj-$(CONFIG_IR_IMON_DECODER) += ir-imon-decoder.o
> +obj-$(CONFIG_IR_RCMM_DECODER) += ir-rcmm-decoder.o
>  
>  # stand-alone IR receivers/transmitters
>  obj-$(CONFIG_RC_ATI_REMOTE) += ati_remote.o
> diff --git a/drivers/media/rc/ir-rcmm-decoder.c b/drivers/media/rc/ir-rcmm-decoder.c
> new file mode 100644
> index 000000000000..94d5b70f7a0f
> --- /dev/null
> +++ b/drivers/media/rc/ir-rcmm-decoder.c
> @@ -0,0 +1,185 @@
> +/* ir-rcmm-decoder.c - A decoder for the RCMM IR protocol
> + *
> + * Copyright (C) 2016 by Patrick Lerda
> + *
> + * 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 version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.

Replace this with the SPDX-License-Identifier.

> + */
> +
> +#include "rc-core-priv.h"
> +#include <linux/module.h>
> +#include <linux/version.h>
> +
> +
> +#define RCMM_UNIT		166667	/* nanosecs */
> +#define RCMM_0_NBITS		64

Not used.

> +#define RCMM_PREFIX_PULSE	416666  /* 166666.666666666*2.5 */
> +#define RCMM_PULSE_0            277777  /* 166666.666666666*(1+2/3) */
> +#define RCMM_PULSE_1            444444  /* 166666.666666666*(2+2/3) */
> +#define RCMM_PULSE_2            611111  /* 166666.666666666*(3+2/3) */
> +#define RCMM_PULSE_3            777778  /* 166666.666666666*(4+2/3) */
> +#define RCMM_MODE_MASK          0x0000

Not used.
> +
> +enum rcmm_state {
> +	STATE_INACTIVE,
> +	STATE_LOW,
> +	STATE_BUMP,
> +	STATE_VALUE,
> +	STATE_FINISHED,
> +};
> +
> +static bool rcmm_mode(struct rcmm_dec *data)
> +{
> +        return !((0x000c0000 & data->bits) == 0x000c0000);
> +}
> +
> +/**
> + * ir_rcmm_decode() - Decode one RCMM pulse or space
> + * @dev:	the struct rc_dev descriptor of the device
> + * @ev:		the struct ir_raw_event descriptor of the pulse/space
> + *
> + * This function returns -EINVAL if the pulse violates the state machine
> + */
> +static int ir_rcmm_decode(struct rc_dev *dev, struct ir_raw_event ev)
> +{
> +	struct rcmm_dec *data = &dev->raw->rcmm;
> +	u32 scancode;
> +	u8 toggle;
> +
> +	if (!(dev->enabled_protocols & RC_PROTO_BIT_RCMM))
> +		return 0;
> +
> +	if (!is_timing_event(ev)) {
> +		if (ev.reset)
> +			data->state = STATE_INACTIVE;
> +		return 0;
> +	}
> +
> +	if (ev.duration > RCMM_PULSE_3 + RCMM_UNIT)
> +		goto out;
> +
> +	switch (data->state) {
> +
> +	case STATE_INACTIVE:
> +		if (!ev.pulse)
> +			break;
> +
> +		/* Note: larger margin on first pulse since each RCMM_UNIT
> +		   is quite short and some hardware takes some time to
> +		   adjust to the signal */

Use:
 /*
  * Note:
  */
Type multiline comments please.

> +		if (!eq_margin(ev.duration, RCMM_PREFIX_PULSE, RCMM_UNIT/2))
> +			break;
> +
> +		data->state = STATE_LOW;
> +		data->count = 0;
> +		data->bits  = 0;
> +		return 0;
> +
> +	case STATE_LOW:
> +		if (ev.pulse)
> +			break;
> +
> +		/* Note: larger margin on first pulse since each RCMM_UNIT
> +		   is quite short and some hardware takes some time to
> +		   adjust to the signal */

Same here

> +		if (!eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT/2))
> +			break;
> +
> +		data->state = STATE_BUMP;
> +		return 0;
> +
> +	case STATE_BUMP:
> +		if (!ev.pulse)
> +			break;
> +
> +		if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2))
> +			break;
> +
> +		data->state = STATE_VALUE;
> +		return 0;
> +
> +	case STATE_VALUE:
> +		if (ev.pulse)
> +			break;
> +	        {
> +			int value;

Please declare value at the top so you don't need a new block.

> +
> +			if (eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT / 2)) {

No { and } needed for oneline statements after if / else if.

> +				value = 0;
> +			} else if (eq_margin(ev.duration, RCMM_PULSE_1, RCMM_UNIT / 2))	{
> +				value = 1;
> +			} else if (eq_margin(ev.duration, RCMM_PULSE_2, RCMM_UNIT / 2))	{
> +				value = 2;
> +			} else if (eq_margin(ev.duration, RCMM_PULSE_3, RCMM_UNIT / 2))	{
> +				value = 3;
> +			} else
> +				break;
> +
> +			data->bits <<= 2;
> +			data->bits |= value;
> +		}
> +
> +		data->count+=2;
> +
> +		if (data->count < 32) {
> +			data->state = STATE_BUMP;
> +		} else {
> +			data->state = STATE_FINISHED;
> +		}

No braces for single line statements.

> +
> +		return 0;
> +
> +	case STATE_FINISHED:
> +	        if (!ev.pulse) break;
> +
> +		if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2))
> +			break;
> +
> +		if (rcmm_mode(data)) {
> +			toggle = !!(0x8000 & data->bits);
> +			scancode = data->bits & ~0x8000;
> +		} else {
> +			toggle = 0;
> +			scancode = data->bits;
> +		}
> +
> +		rc_keydown(dev, RC_PROTO_RCMM, scancode, toggle);
> +		data->state = STATE_INACTIVE;
> +		return 0;
> +	}
> +
> +out:
> +	data->state = STATE_INACTIVE;
> +	return -EINVAL;
> +}
> +
> +static struct ir_raw_handler rcmm_handler = {
> +	.protocols	= RC_PROTO_BIT_RCMM,
> +	.decode		= ir_rcmm_decode,

It would be nice to have an rcmm encoder as well.

> +};
> +
> +static int __init ir_rcmm_decode_init(void)
> +{
> +	ir_raw_handler_register(&rcmm_handler);
> +
> +	printk(KERN_INFO "IR RCMM protocol handler initialized\n");
Use:
	pr_info()

> +	return 0;
> +}
> +
> +static void __exit ir_rcmm_decode_exit(void)
> +{
> +	ir_raw_handler_unregister(&rcmm_handler);
> +}
> +
> +module_init(ir_rcmm_decode_init);
> +module_exit(ir_rcmm_decode_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Patrick LERDA");
> +MODULE_DESCRIPTION("RCMM IR protocol decoder");
> diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
> index c2cbe7f6266c..c63d4ad007cc 100644
> --- a/drivers/media/rc/rc-core-priv.h
> +++ b/drivers/media/rc/rc-core-priv.h
> @@ -131,6 +131,11 @@ struct ir_raw_event_ctrl {
>  		unsigned int bits;
>  		bool stick_keyboard;
>  	} imon;
> +	struct rcmm_dec {
> +		int state;
> +		unsigned count;
> +		u64 bits;
> +	} rcmm;
>  };
>  
>  /* Mutex for locking raw IR processing and handler change */
> diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
> index 552bbe82a160..ad1dee921f5b 100644
> --- a/drivers/media/rc/rc-main.c
> +++ b/drivers/media/rc/rc-main.c
> @@ -70,6 +70,8 @@ static const struct {
>  	[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 },
>  	[RC_PROTO_IMON] = { .name = "imon",
>  		.scancode_bits = 0x7fffffff, .repeat_period = 114 },
> +	[RC_PROTO_RCMM] = { .name = "rcmm",
> +		.scancode_bits = 0xffffffff, .repeat_period = 114 },
>  };
>  
>  /* Used to keep track of known keymaps */
> @@ -1004,6 +1006,7 @@ static const struct {
>  	{ RC_PROTO_BIT_XMP,	"xmp",		"ir-xmp-decoder"	},
>  	{ RC_PROTO_BIT_CEC,	"cec",		NULL			},
>  	{ RC_PROTO_BIT_IMON,	"imon",		"ir-imon-decoder"	},
> +	{ RC_PROTO_BIT_RCMM,	"rcmm",		"ir-rcmm-decoder"	},
>  };
>  
>  /**
> diff --git a/include/media/rc-map.h b/include/media/rc-map.h
> index bfa3017cecba..f06200362a3c 100644
> --- a/include/media/rc-map.h
> +++ b/include/media/rc-map.h
> @@ -37,6 +37,7 @@
>  #define RC_PROTO_BIT_XMP		BIT_ULL(RC_PROTO_XMP)
>  #define RC_PROTO_BIT_CEC		BIT_ULL(RC_PROTO_CEC)
>  #define RC_PROTO_BIT_IMON		BIT_ULL(RC_PROTO_IMON)
> +#define RC_PROTO_BIT_RCMM		BIT_ULL(RC_PROTO_RCMM)
>  
>  #define RC_PROTO_BIT_ALL \
>  			(RC_PROTO_BIT_UNKNOWN | RC_PROTO_BIT_OTHER | \
> @@ -51,7 +52,7 @@
>  			 RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 | \
>  			 RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \
>  			 RC_PROTO_BIT_XMP | RC_PROTO_BIT_CEC | \
> -			 RC_PROTO_BIT_IMON)
> +			 RC_PROTO_BIT_IMON | RC_PROTO_BIT_RCMM)
>  /* All rc protocols for which we have decoders */
>  #define RC_PROTO_BIT_ALL_IR_DECODER \
>  			(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
> @@ -64,7 +65,8 @@
>  			 RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
>  			 RC_PROTO_BIT_RC6_6A_24 |  RC_PROTO_BIT_RC6_6A_32 | \
>  			 RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \
> -			 RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON)
> +			 RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON | \
> +			 RC_PROTO_BIT_RCMM)
>  
>  #define RC_PROTO_BIT_ALL_IR_ENCODER \
>  			(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
> diff --git a/include/uapi/linux/lirc.h b/include/uapi/linux/lirc.h
> index 6b319581882f..2bc7915ff33a 100644
> --- a/include/uapi/linux/lirc.h
> +++ b/include/uapi/linux/lirc.h
> @@ -218,6 +218,7 @@ enum rc_proto {
>  	RC_PROTO_XMP		= 21,
>  	RC_PROTO_CEC		= 22,
>  	RC_PROTO_IMON		= 23,
> +	RC_PROTO_RCMM		= 24,
>  };
>  
>  #endif
> diff --git a/tools/include/uapi/linux/lirc.h b/tools/include/uapi/linux/lirc.h
> index f189931042a7..c03e9562e349 100644
> --- a/tools/include/uapi/linux/lirc.h
> +++ b/tools/include/uapi/linux/lirc.h
> @@ -212,6 +212,7 @@ enum rc_proto {
>  	RC_PROTO_XMP		= 21,
>  	RC_PROTO_CEC		= 22,
>  	RC_PROTO_IMON		= 23,
> +	RC_PROTO_RCMM		= 24,
>  };
>  

An entry in MAINTAINERS would be good, and please run 
./script/checkpatch.pl --strict on your patch and fix any issues you find.

Thanks,

Sean

>  #endif
> -- 
> 2.19.2