linux-kernel - Re: [PATCH v1 2/4] usb: typec: Update sysfs when setting ops

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Message-ID: <ZifVWgG2PTna95MM@google.com>
Date: Tue, 23 Apr 2024 15:35:54 +0000
From: Benson Leung <bleung@...gle.com>
To: Jameson Thies <jthies@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
	pmalani@...omium.org, abhishekpandit@...omium.org,
	andersson@...nel.org, dmitry.baryshkov@...aro.org,
	fabrice.gasnier@...s.st.com, gregkh@...uxfoundation.org,
	hdegoede@...hat.com, neil.armstrong@...aro.org,
	rajaram.regupathy@...el.com, saranya.gopal@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/4] usb: typec: Update sysfs when setting ops

On Fri, Apr 19, 2024 at 09:16:48PM +0000, Jameson Thies wrote:
> From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> 
> When adding altmode ops, update the sysfs group so that visibility is
> also recalculated.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
>  drivers/usb/typec/altmodes/displayport.c |  2 +-
>  drivers/usb/typec/class.c                | 18 +++++++++++++++++-
>  drivers/usb/typec/ucsi/displayport.c     |  2 +-
>  include/linux/usb/typec.h                |  3 +++
>  4 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index 596cd4806018b..92cc1b1361208 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -746,7 +746,7 @@ int dp_altmode_probe(struct typec_altmode *alt)
>  	dp->alt = alt;
>  
>  	alt->desc = "DisplayPort";
> -	alt->ops = &dp_altmode_ops;
> +	typec_altmode_set_ops(alt, &dp_altmode_ops);
>  
>  	if (plug) {
>  		plug->desc = "Displayport";
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9610e647a8d48..9262fcd4144f8 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -467,6 +467,22 @@ static const struct attribute_group *typec_altmode_groups[] = {
>  	NULL
>  };
>  
> +/**
> + * typec_altmode_set_ops - Set ops for altmode
> + * @adev: Handle to the alternate mode
> + * @ops: Ops for the alternate mode
> + *
> + * After setting ops, attribute visiblity needs to be refreshed if the alternate
> + * mode can be activated.
> + */
> +void typec_altmode_set_ops(struct typec_altmode *adev,
> +			   const struct typec_altmode_ops *ops)
> +{
> +	adev->ops = ops;
> +	sysfs_update_group(&adev->dev.kobj, &typec_altmode_group);
> +}
> +EXPORT_SYMBOL_GPL(typec_altmode_set_ops);
> +
>  static int altmode_id_get(struct device *dev)
>  {
>  	struct ida *ids;
> @@ -2317,7 +2333,7 @@ void typec_port_register_altmodes(struct typec_port *port,
>  			continue;
>  		}
>  
> -		alt->ops = ops;
> +		typec_altmode_set_ops(alt, ops);
>  		typec_altmode_set_drvdata(alt, drvdata);
>  		altmodes[index] = alt;
>  		index++;
> diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
> index d9d3c91125ca8..eb7b8d6e47d00 100644
> --- a/drivers/usb/typec/ucsi/displayport.c
> +++ b/drivers/usb/typec/ucsi/displayport.c
> @@ -337,7 +337,7 @@ struct typec_altmode *ucsi_register_displayport(struct ucsi_connector *con,
>  	dp->con = con;
>  	dp->alt = alt;
>  
> -	alt->ops = &ucsi_displayport_ops;
> +	typec_altmode_set_ops(alt, &ucsi_displayport_ops);
>  	typec_altmode_set_drvdata(alt, dp);
>  
>  	return alt;
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index b35b427561ab5..549275f8ac1b3 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -167,6 +167,9 @@ struct typec_port *typec_altmode2port(struct typec_altmode *alt);
>  
>  void typec_altmode_update_active(struct typec_altmode *alt, bool active);
>  
> +void typec_altmode_set_ops(struct typec_altmode *alt,
> +			   const struct typec_altmode_ops *ops);
> +
>  enum typec_plug_index {
>  	TYPEC_PLUG_SOP_P,
>  	TYPEC_PLUG_SOP_PP,
> -- 
> 2.44.0.769.g3c40516874-goog
> 

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