linux-kernel - Re: [PATCH 3/5] USB: serial: add sysfs attribute to suppress ready signalling on open

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Message-ID: <CAHp75VdSW890kHsFbHGmLeOX=oPNU2SJ4_iyvxEO-574u1S9Tw@mail.gmail.com>
Date:   Mon, 30 Nov 2020 20:29:59 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "Mychaela N . Falconia" <falcon@...ecalypso.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] USB: serial: add sysfs attribute to suppress ready
 signalling on open

On Mon, Nov 30, 2020 at 5:42 PM Johan Hovold <johan@...nel.org> wrote:
>
> Add a nordy sysfs attribute to suppress raising the modem-control lines
> on open to signal DTE readiness.
>
> This can be use to prevent undesirable side-effects on open for
> applications where the DTR and RTS lines are used for non-standard
> purposes such as generating power-on and reset pulses.

...

> +       ret = kstrtouint(buf, 0, &val);
> +       if (ret)
> +               return ret;
> +
> +       if (val > 1)
> +               return -EINVAL;

kstrtobool() ?

-- 
With Best Regards,
Andy Shevchenko