linux-kernel - Re: [PATCH v1 1/3] serdev: Add method to assert break

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Date:   Tue, 24 Jan 2023 14:17:01 -0800
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, marcel@...tmann.org,
        johan.hedberg@...il.com, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        amitkumar.karwar@....com, rohit.fule@....com, sherry.sun@....com
Subject: Re: [PATCH v1 1/3] serdev: Add method to assert break

Hi Neeraj,

On Tue, Jan 24, 2023 at 9:48 AM Neeraj Sanjay Kale
<neeraj.sanjaykale@....com> wrote:
>
> Adds serdev_device_break_ctl() and an implementation for ttyport.
>
> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
> ---
>  drivers/tty/serdev/core.c           | 11 +++++++++++
>  drivers/tty/serdev/serdev-ttyport.c | 12 ++++++++++++
>  include/linux/serdev.h              |  6 ++++++
>  3 files changed, 29 insertions(+)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index 0180e1e4e75d..26321ad7e71d 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -405,6 +405,17 @@ int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
>  }
>  EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
>
> +int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)
> +{
> +       struct serdev_controller *ctrl = serdev->ctrl;
> +
> +       if (!ctrl || !ctrl->ops->break_ctl)
> +               return -ENOTSUPP;
> +
> +       return ctrl->ops->break_ctl(ctrl, break_state);
> +}
> +EXPORT_SYMBOL_GPL(serdev_device_break_ctl);
> +
>  static int serdev_drv_probe(struct device *dev)
>  {
>         const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
> diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
> index d367803e2044..847b1f71ab73 100644
> --- a/drivers/tty/serdev/serdev-ttyport.c
> +++ b/drivers/tty/serdev/serdev-ttyport.c
> @@ -247,6 +247,17 @@ static int ttyport_set_tiocm(struct serdev_controller *ctrl, unsigned int set, u
>         return tty->ops->tiocmset(tty, set, clear);
>  }
>
> +static int ttyport_break_ctl(struct serdev_controller *ctrl, unsigned int break_state)
> +{
> +       struct serport *serport = serdev_controller_get_drvdata(ctrl);
> +       struct tty_struct *tty = serport->tty;
> +
> +       if (!tty->ops->break_ctl)
> +               return -ENOTSUPP;
> +
> +       return tty->ops->break_ctl(tty, break_state);
> +}
> +
>  static const struct serdev_controller_ops ctrl_ops = {
>         .write_buf = ttyport_write_buf,
>         .write_flush = ttyport_write_flush,
> @@ -259,6 +270,7 @@ static const struct serdev_controller_ops ctrl_ops = {
>         .wait_until_sent = ttyport_wait_until_sent,
>         .get_tiocm = ttyport_get_tiocm,
>         .set_tiocm = ttyport_set_tiocm,
> +       .break_ctl = ttyport_break_ctl,
>  };
>
>  struct device *serdev_tty_port_register(struct tty_port *port,
> diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> index 66f624fc618c..01b5b8f308cb 100644
> --- a/include/linux/serdev.h
> +++ b/include/linux/serdev.h
> @@ -92,6 +92,7 @@ struct serdev_controller_ops {
>         void (*wait_until_sent)(struct serdev_controller *, long);
>         int (*get_tiocm)(struct serdev_controller *);
>         int (*set_tiocm)(struct serdev_controller *, unsigned int, unsigned int);
> +       int (*break_ctl)(struct serdev_controller *, unsigned int);

Looks like these callbacks don't have any documentation, not sure if
that is because the operation itself is self explanatory, anyway I
hope someone can review this from serdev before it can be merged into
bluetooth-next.

>  };
>
>  /**
> @@ -202,6 +203,7 @@ int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_
>  void serdev_device_wait_until_sent(struct serdev_device *, long);
>  int serdev_device_get_tiocm(struct serdev_device *);
>  int serdev_device_set_tiocm(struct serdev_device *, int, int);
> +int serdev_device_break_ctl(struct serdev_device *, int);
>  void serdev_device_write_wakeup(struct serdev_device *);
>  int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, long);
>  void serdev_device_write_flush(struct serdev_device *);
> @@ -255,6 +257,10 @@ static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set,
>  {
>         return -ENOTSUPP;
>  }
> +static inline int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)
> +{
> +       return -ENOTSUPP;
> +}
>  static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf,
>                                       size_t count, unsigned long timeout)
>  {
> --
> 2.34.1
>


-- 
Luiz Augusto von Dentz