linux-kernel - Re: [PATCH 1/3] spmi: Add driver shutdown support

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Date:   Tue, 4 Aug 2020 09:51:03 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-arm-msm@...r.kernel.org,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH 1/3] spmi: Add driver shutdown support

On Mon, Aug 3, 2020 at 4:57 PM Hsin-Hsiung Wang
<hsin-hsiung.wang@...iatek.com> wrote:
>
> Add new shutdown() method.  Use it in the standard driver model style.
>
> Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
> ---
>  drivers/spmi/spmi.c  | 12 ++++++++++++
>  drivers/spmi/spmi.c  | 12 ++++++++++++
>  include/linux/spmi.h |  1 +
>  2 files changed, 13 insertions(+)
>
> diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
> index c16b60f..5fde024 100644
> --- a/drivers/spmi/spmi.c
> +++ b/drivers/spmi/spmi.c
> @@ -357,6 +357,17 @@ static int spmi_drv_remove(struct device *dev)
>         return 0;
>  }
>
> +static void spmi_drv_shutdown(struct device *dev)
> +{
> +       const struct spmi_driver *sdrv = to_spmi_driver(dev->driver);
> +
> +       if (!sdrv)
> +               return;
> +
> +
> +       if (sdrv->shutdown)
> +               sdrv->shutdown(to_spmi_device(dev));

Slight more succinct (assuming sdrv _can_ actually be NULL, I'm not
sure about that)

if (srdv && sdrv->shutdown)

> +}
> +}
> +
>  static int spmi_drv_uevent(struct device *dev, struct kobj_uevent_env *env)
>  {
>         int ret;
> @@ -373,6 +384,7 @@ static struct bus_type spmi_bus_type = {
> @@ -373,6 +384,7 @@ static struct bus_type spmi_bus_type = {
>         .match          = spmi_device_match,
>         .probe          = spmi_drv_probe,
>         .remove         = spmi_drv_remove,
> +       .shutdown       = spmi_drv_shutdown,
>         .uevent         = spmi_drv_uevent,
>  };
>
> diff --git a/include/linux/spmi.h b/include/linux/spmi.h
> index 394a3f6..729bcbf 100644
> --- a/include/linux/spmi.h
> +++ b/include/linux/spmi.h
> @@ -138,6 +138,7 @@ struct spmi_driver {
>         struct device_driver driver;
>         int     (*probe)(struct spmi_device *sdev);
>         void    (*remove)(struct spmi_device *sdev);
> +       void    (*shutdown)(struct spmi_device *sdev);
>  };
>
>  static inline struct spmi_driver *to_spmi_driver(struct device_driver *d)
> --
> 2.6.4