linux-kernel - Re: [RFC PATCH 2/7] typec: tcpm: Add ADO header for Alert message handling

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Date:   Thu, 2 Nov 2017 17:49:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sre@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Yueyao Zhu <yueyao.zhu@...il.com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Support Opensource <Support.Opensource@...semi.com>
Subject: Re: [RFC PATCH 2/7] typec: tcpm: Add ADO header for Alert message
 handling

On Thu, Nov 02, 2017 at 11:40:12AM +0000, Adam Thomson wrote:
> On 01 November 2017 17:20, Greg Kroah-Hartman wrote:
> 
> > On Wed, Nov 01, 2017 at 05:03:10PM +0000, Adam Thomson wrote:
> > > This commit adds a header providing definitions for handling Alert
> > > messages. Currently the header only focuses on handling incoming
> > > alerts.
> > >
> > > Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> > > ---
> > >  include/linux/usb/pd_ado.h | 49
> > ++++++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 49 insertions(+)
> > >  create mode 100644 include/linux/usb/pd_ado.h
> > >
> > > diff --git a/include/linux/usb/pd_ado.h b/include/linux/usb/pd_ado.h
> > > new file mode 100644
> > > index 0000000..edcbcfa
> > > --- /dev/null
> > > +++ b/include/linux/usb/pd_ado.h
> > > @@ -0,0 +1,49 @@
> > > +/*
> > > + * Copyright (c) 2017 Dialog Semiconductor
> > > + *
> > > + * Author: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License as published by
> > > + * the Free Software Foundation; either version 2 of the License, or
> > > + * (at your option) any later version.
> >
> > I have to ask, do you _really_ mean "any later version"?
> 
> Many thanks for the prompt comments.
> 
> So this is the same copyright header applied for the other PD related code
> (bit of a copy and paste to follow existing tcpm practice), and have tended to
> use this header for other driver development as well. Within the context of the
> Linux kernel I believe this should be fine and will resolve to GPLv2, and should
> someone use the code elsewhere then they can choose a later GPL license, not
> that I suspect many would. Do you see any problems here as am happy to be
> corrected? :)

Please consult your lawyers as to what license you should use for new
kernel code.  Never just blindly copy/paste without knowing what you are
supposed to be doing :)

> > > + *
> > > + * This program is distributed in the hope that it will be useful,
> > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > + * GNU General Public License for more details.
> > > + */
> > > +
> > > +#ifndef __LINUX_USB_PD_ADO_H
> > > +#define __LINUX_USB_PD_ADO_H
> > > +
> > > +/* ADO : Alert Data Object */
> > > +#define ADO_TYPE_SHIFT			24
> > > +#define ADO_TYPE_MASK			0xff
> > > +#define ADO_FIXED_BATT_SHIFT		20
> > > +#define ADO_FIXED_BATT_MASK		0xf
> > > +#define ADO_HOT_SWAP_BATT_SHIFT		16
> > > +#define ADO_HOT_SWAP_BATT_MASK		0xf
> >
> > USB_ prefixes perhaps?
> 
> Again here I was following the existing TCPM approach, but if it's a problem
> then I can update this.

What does TCPM use here?  I missed those defines...

> > > +
> > > +#define ADO_TYPE_BATT_STATUS_CHANGE	BIT(1)
> > > +#define ADO_TYPE_OCP			BIT(2)
> > > +#define ADO_TYPE_OTP			BIT(3)
> > > +#define ADO_TYPE_OP_COND_CHANGE		BIT(4)
> > > +#define ADO_TYPE_SRC_INPUT_CHANGE	BIT(5)
> > > +#define ADO_TYPE_OVP			BIT(6)
> > > +
> > > +static inline unsigned int ado_type(u32 ado)
> > > +{
> > > +	return (ado >> ADO_TYPE_SHIFT) & ADO_TYPE_MASK;
> > > +}
> >
> > usb_ prefix for this and the other inline functions as well?
> 
> Same comment here.

But it would make more sense, right?

thanks,

greg k-h