linux-kernel - Re: [PATCH] usb: typec: tcpm: Export partner Source Capabilities

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Message-ID: <20190131070238.GA4500@kroah.com>
Date:   Thu, 31 Jan 2019 08:02:38 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kyle Tso <kyletso@...gle.com>
Cc:     linux@...ck-us.net, heikki.krogerus@...ux.intel.com,
        badhri@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: tcpm: Export partner Source Capabilities

On Thu, Jan 31, 2019 at 11:54:11AM +0800, Kyle Tso wrote:
> Provide a function to get the partner Source Capabilities.
> 
> Signed-off-by: Kyle Tso <kyletso@...gle.com>
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 23 +++++++++++++++++++++++
>  include/linux/usb/tcpm.h      |  1 +
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index f1d3e54210df..29cd84ba9960 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4494,6 +4494,29 @@ int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
>  }
>  EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
>  
> +/*
> + * Don't call this function in interrupt context. Caller needs to free the
> + * memory itself.
> + */
> +int tcpm_get_partner_src_caps(struct tcpm_port *port, u32 **src_pdo)
> +{
> +	unsigned int nr_pdo;
> +
> +	if (port->nr_source_caps == 0)
> +		return -ENODATA;
> +
> +	*src_pdo = kcalloc(port->nr_source_caps, sizeof(u32), GFP_KERNEL);
> +	if (!src_pdo)
> +		return -ENOMEM;
> +
> +	mutex_lock(&port->lock);
> +	nr_pdo = tcpm_copy_pdos(*src_pdo, port->source_caps,
> +				port->nr_source_caps);
> +	mutex_unlock(&port->lock);
> +	return nr_pdo;
> +}
> +EXPORT_SYMBOL_GPL(tcpm_get_partner_src_caps);

We don't add new functions that no one uses :(