linux-kernel - Re: [PATCH 09/10] serdev: add serdev_device_set

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Date:   Tue, 7 Mar 2017 22:18:38 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/10] serdev: add serdev_device_set_rts

Hi Rob,

On Tue, Mar 07, 2017 at 10:07:56AM -0600, Rob Herring wrote:
> On Sat, Mar 4, 2017 at 5:58 AM, Sebastian Reichel <sre@...nel.org> wrote:
> > Add function to enable/disable RTS line.
> >
> > Signed-off-by: Sebastian Reichel <sre@...nel.org>
> > ---
> 
> > +static void ttyport_set_rts(struct serdev_controller *ctrl, bool enable)
> > +{
> > +       struct serport *serport = serdev_controller_get_drvdata(ctrl);
> > +       struct tty_struct *tty = serport->tty;
> > +       int status = tty->driver->ops->tiocmget(tty);
> > +       unsigned int set = 0;
> > +       unsigned int clear = 0;
> > +
> > +       if (enable) {
> > +               set |= (TIOCM_OUT2 | TIOCM_RTS);
> > +               clear = ~set;
> > +               set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
> > +                      TIOCM_OUT2 | TIOCM_LOOP;
> > +               clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
> > +                        TIOCM_OUT2 | TIOCM_LOOP;
> > +               status = tty->driver->ops->tiocmset(tty, set, clear);
> > +       } else {
> > +               set &= ~(TIOCM_OUT2 | TIOCM_RTS);
> > +               clear = ~set;
> > +               set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
> > +                      TIOCM_OUT2 | TIOCM_LOOP;
> > +               clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
> > +                        TIOCM_OUT2 | TIOCM_LOOP;
> > +               status = tty->driver->ops->tiocmset(tty, set, clear);
> 
> The logic here can be greatly simplified. Here's a patch to the
> original version that I came up with, but haven't tested:

ah I totally forgot to clean that mess. I took that over from the
bluetooth code, since that got the nokia bluetooth chips working.
I will do this in the next revision.

-- Sebastian

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