linux-kernel - Re: [PATCH v2 1/3] usb: typec: ucsi: psy: Add power supply status

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Message-ID: <aPGJImOPx4yCWQnv@google.com>
Date: Fri, 17 Oct 2025 00:09:06 +0000
From: Benson Leung <bleung@...gle.com>
To: Jameson Thies <jthies@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmitry.baryshkov@....qualcomm.com,
	bleung@...omium.org, gregkh@...uxfoundation.org,
	akuchynski@...omium.org, abhishekpandit@...omium.org,
	sebastian.reichel@...labora.com, kenny@...ix.com,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] usb: typec: ucsi: psy: Add power supply status

On Thu, Oct 16, 2025 at 11:59:07PM +0000, Jameson Thies wrote:
> Add support for power supply status. If a port is acting as a sink
> with the sink path enabled, report it is charging. If a port is
> source, report it is discharging. If there is no connection or the
> port hasn't enabled the sink path, report not charging.
> 
> Signed-off-by: Jameson Thies <jthies@...gle.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

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


> ---
>  drivers/usb/typec/ucsi/psy.c  | 26 ++++++++++++++++++++++++++
>  drivers/usb/typec/ucsi/ucsi.h |  3 +++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/usb/typec/ucsi/psy.c b/drivers/usb/typec/ucsi/psy.c
> index 62a9d68bb66d..2b0225821502 100644
> --- a/drivers/usb/typec/ucsi/psy.c
> +++ b/drivers/usb/typec/ucsi/psy.c
> @@ -29,6 +29,7 @@ static enum power_supply_property ucsi_psy_props[] = {
>  	POWER_SUPPLY_PROP_CURRENT_MAX,
>  	POWER_SUPPLY_PROP_CURRENT_NOW,
>  	POWER_SUPPLY_PROP_SCOPE,
> +	POWER_SUPPLY_PROP_STATUS,
>  };
>  
>  static int ucsi_psy_get_scope(struct ucsi_connector *con,
> @@ -51,6 +52,29 @@ static int ucsi_psy_get_scope(struct ucsi_connector *con,
>  	return 0;
>  }
>  
> +static int ucsi_psy_get_status(struct ucsi_connector *con,
> +			       union power_supply_propval *val)
> +{
> +	bool is_sink = UCSI_CONSTAT(con, PWR_DIR) == TYPEC_SINK;
> +	bool sink_path_enabled = true;
> +
> +	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> +
> +	if (con->ucsi->version >= UCSI_VERSION_2_0)
> +		sink_path_enabled =
> +			UCSI_CONSTAT(con, SINK_PATH_STATUS_V2_0) ==
> +			UCSI_CONSTAT_SINK_PATH_ENABLED;
> +
> +	if (UCSI_CONSTAT(con, CONNECTED)) {
> +		if (is_sink && sink_path_enabled)
> +			val->intval = POWER_SUPPLY_STATUS_CHARGING;
> +		else if (!is_sink)
> +			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> +	}
> +
> +	return 0;
> +}
> +
>  static int ucsi_psy_get_online(struct ucsi_connector *con,
>  			       union power_supply_propval *val)
>  {
> @@ -245,6 +269,8 @@ static int ucsi_psy_get_prop(struct power_supply *psy,
>  		return ucsi_psy_get_current_now(con, val);
>  	case POWER_SUPPLY_PROP_SCOPE:
>  		return ucsi_psy_get_scope(con, val);
> +	case POWER_SUPPLY_PROP_STATUS:
> +		return ucsi_psy_get_status(con, val);
>  	default:
>  		return -EINVAL;
>  	}
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index e301d9012936..cce93af7461b 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -360,6 +360,9 @@ struct ucsi_cable_property {
>  #define   UCSI_CONSTAT_BC_SLOW_CHARGING		2
>  #define   UCSI_CONSTAT_BC_TRICKLE_CHARGING	3
>  #define UCSI_CONSTAT_PD_VERSION_V1_2		UCSI_DECLARE_BITFIELD_V1_2(70, 16)
> +#define UCSI_CONSTAT_SINK_PATH_STATUS_V2_0	UCSI_DECLARE_BITFIELD_V2_0(87, 1)
> +#define   UCSI_CONSTAT_SINK_PATH_DISABLED   0
> +#define   UCSI_CONSTAT_SINK_PATH_ENABLED    1
>  #define UCSI_CONSTAT_PWR_READING_READY_V2_1	UCSI_DECLARE_BITFIELD_V2_1(89, 1)
>  #define UCSI_CONSTAT_CURRENT_SCALE_V2_1		UCSI_DECLARE_BITFIELD_V2_1(90, 3)
>  #define UCSI_CONSTAT_PEAK_CURRENT_V2_1		UCSI_DECLARE_BITFIELD_V2_1(93, 16)
> -- 
> 2.51.0.858.gf9c4a03a3a-goog
> 

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