linux-kernel - Re: [PATCH 3/6] usb: typec: Add typec_partner_set_pd

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Message-ID: <20210201124147.GC2465@kuha.fi.intel.com>
Date:   Mon, 1 Feb 2021 14:41:47 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Benson Leung <bleung@...omium.org>
Cc:     enric.balletbo@...labora.com, pmalani@...omium.org,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        bleung@...gle.com
Subject: Re: [PATCH 3/6] usb: typec: Add typec_partner_set_pd_revision

On Thu, Jan 28, 2021 at 10:14:03PM -0800, Benson Leung wrote:
> The partner's PD revision may be resolved later than the port partner
> registration since the port partner creation may take place once
> Type-C detects the port has changed state, but before PD communication is
> completed.
> 
> Add a setter so that the partner's PD revision can be attached to it once
> it becomes available.
> 
> If the revision is set to a valid version (not 0), the setter will also
> refresh the partner's usb_pd flag and notify on "supports_usb_power_delivery"
> sysfs property as well.
> 
> Signed-off-by: Benson Leung <bleung@...omium.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/class.c | 30 ++++++++++++++++++++++++++++++
>  include/linux/usb/typec.h |  1 +
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index b5241f4756c2..b6ceab3dc16b 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -748,6 +748,36 @@ int typec_partner_set_identity(struct typec_partner *partner)
>  }
>  EXPORT_SYMBOL_GPL(typec_partner_set_identity);
>  
> +/**
> + * typec_partner_set_pd_revision - Set the PD revision supported by the partner
> + * @partner: The partner to be updated.
> + * @pd_revision:  USB Power Delivery Specification Revision supported by partner
> + *
> + * This routine is used to report that the PD revision of the port partner has
> + * become available.
> + *
> + * Returns 0 on success or negative error number on failure.
> + */
> +int typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
> +{
> +	int ret;
> +
> +	if (partner->pd_revision == pd_revision)
> +		return 0;
> +
> +	partner->pd_revision = pd_revision;
> +	sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
> +	if (pd_revision != 0 && !partner->usb_pd) {
> +		partner->usb_pd = 1;
> +		sysfs_notify(&partner->dev.kobj, NULL,
> +			     "supports_usb_power_delivery");
> +	}
> +	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
> +
>  /**
>   * typec_partner_set_num_altmodes - Set the number of available partner altmodes
>   * @partner: The partner to be updated.
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index 42c6b7c07a99..4946eca742d5 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -126,6 +126,7 @@ struct typec_altmode_desc {
>  	enum typec_port_data	roles;
>  };
>  
> +int typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision);
>  int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes);
>  struct typec_altmode
>  *typec_partner_register_altmode(struct typec_partner *partner,
> -- 
> 2.30.0.365.g02bc693789-goog

thanks,

-- 
heikki