linux-kernel - Re: [PATCH] extcon: Add EXTCON_BATTERY type for battery presence

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Message-ID: <dc62d036-dcab-532b-1c3c-fbebcd1705fa@gmail.com>
Date:   Tue, 10 Jan 2023 22:39:38 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     andrew lien/WHQ/Wistron <andrew_lien@...tron.com>,
        myungjoo.ham@...sung.com
Cc:     cw00.choi@...sung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extcon: Add EXTCON_BATTERY type for battery presence

On 23. 1. 10. 11:36, andrew lien/WHQ/Wistron wrote:
> This information can be useful to device that support battery swap,
> for example allowing them to indicate that a battery is present or not,
> so provide a standard way to report it to userspace.
> 
> Signed-off-by: andrew lien/WHQ/Wistron <andrew_lien@...tron.com>
> ---
>  drivers/extcon/extcon.c | 5 +++++
>  include/linux/extcon.h  | 3 ++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index b4df4372f097..6c47d23244c3 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -184,6 +184,11 @@ static const struct __extcon_info {
>  		.id = EXTCON_MECHANICAL,
>  		.name = "MECHANICAL",
>  	},
> +	[EXTCON_BATTERY] = {
> +		.type = EXTCON_TYPE_MISC,
> +		.id = EXTCON_BATTERY,
> +		.name = "BATTERY",
> +	},
>  
>  	{ /* sentinel */ }
>  };
> diff --git a/include/linux/extcon.h b/include/linux/extcon.h
> index b0b4abb018ee..88210b481b6c 100644
> --- a/include/linux/extcon.h
> +++ b/include/linux/extcon.h
> @@ -81,8 +81,9 @@
>  #define EXTCON_DOCK		60
>  #define EXTCON_JIG		61
>  #define EXTCON_MECHANICAL	62
> +#define EXTCON_BATTERY		63
>  
> -#define EXTCON_NUM		63
> +#define EXTCON_NUM		64
>  
>  /*
>   * Define the properties of supported external connectors.

Actually, battery is not external connector. The power_supply
subsystem already provided the POWER_SUPPLY_PROP_PRESENT
for the battery present. You have to develop the power_supply device driver
and then use power_supply_changed() to send the uevent to user-space.

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi