linux-kernel - Re: [RFC PATCH v4 2/8] usb: typec: helper for checking cable plug orientation

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Message-ID: <20180612221842.GA16275@roeck-us.net>
Date:   Tue, 12 Jun 2018 15:18:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mats Karrman <mats.dev.list@...il.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jun Li <jun.li@....com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 2/8] usb: typec: helper for checking cable plug
 orientation

On Tue, Jun 12, 2018 at 08:56:31PM +0200, Mats Karrman wrote:
> Hi Heikki,
> 
> On 2018-06-08 13:29, Heikki Krogerus wrote:
> 
> >This adds function typec_get_orientation() that can be used
> >for checking the current cable plug orientation.
> >
> >Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> >---
> >  drivers/usb/typec/class.c | 11 +++++++++++
> >  include/linux/usb/typec.h |  1 +
> >  2 files changed, 12 insertions(+)
> >
> >diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> >index 53df10df2f9d..02db9bcbac0c 100644
> >--- a/drivers/usb/typec/class.c
> >+++ b/drivers/usb/typec/class.c
> >@@ -1279,6 +1279,17 @@ int typec_set_orientation(struct typec_port *port,
> >  }
> >  EXPORT_SYMBOL_GPL(typec_set_orientation);
> >+/**
> >+ * typec_get_orientation - Get USB Type-C cable plug orientation
> >+ * @port: USB Type-C Port
> >+ *
> >+ * Get current cable plug orientation for @port.
> >+ */
> >+enum typec_orientation typec_get_orientation(struct typec_port *port)
> >+{
> >+	return port->orientation;
> >+}
> 
> +EXPORT_SYMBOL_GPL(typec_get_orientation);
> 
> Isn't this a candidate for an inline?
> 

Currently struct typec_port is class private. To make this function inline,
struct typec_port would have to be moved from drivers/usb/typec/class.c to
include/linux/usb/typec.h. That doesn't sound like a good idea to me.

Guenter

> BR // Mats
> 
> >+
> >  /**
> >   * typec_set_mode - Set mode of operation for USB Type-C connector
> >   * @port: USB Type-C port for the connector
> >diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> >index 672b39bb0adc..a5f6433e218b 100644
> >--- a/include/linux/usb/typec.h
> >+++ b/include/linux/usb/typec.h
> >@@ -265,6 +265,7 @@ void typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);
> >  int typec_set_orientation(struct typec_port *port,
> >  			  enum typec_orientation orientation);
> >+enum typec_orientation typec_get_orientation(struct typec_port *port);
> >  int typec_set_mode(struct typec_port *port, int mode);
> >  #endif /* __LINUX_USB_TYPEC_H */
> >