linux-kernel - Re: [PATCH v4 1/6] i3c: master: add enable(disable) hot join in sys entry

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Date:   Thu, 30 Nov 2023 11:13:21 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Frank Li <Frank.Li@....com>
Cc:     alexandre.belloni@...tlin.com, conor.culhane@...vaco.com,
        imx@...ts.linux.dev, joe@...ches.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        zbigniew.lukwinski@...ux.intel.com
Subject: Re: [PATCH v4 1/6] i3c: master: add enable(disable) hot join in sys
 entry

Hi Frank,

Frank.Li@....com wrote on Wed, 29 Nov 2023 17:12:20 -0500:

> Add hotjoin entry in sys file system allow user enable/disable hotjoin
> feature.
> 
> Add (*enable(disable)_hotjoin)() to i3c_master_controller_ops.
> Add api i3c_master_enable(disable)_hotjoin();
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/i3c/master.c       | 84 ++++++++++++++++++++++++++++++++++++++
>  include/linux/i3c/master.h |  5 +++
>  2 files changed, 89 insertions(+)
> 
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 08aeb69a78003..ed5e27cd20811 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -526,6 +526,89 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(i2c_scl_frequency);
>  
> +static int i3c_set_hotjoin(struct i3c_master_controller *master, bool enable)
> +{
> +	int ret;
> +
> +	if (!master ||
> +	    !master->ops ||
> +	    !master->ops->enable_hotjoin ||
> +	    !master->ops->disable_hotjoin
> +	   )

Style is wrong here (max limit is 100 chars and the ) should not be on
a new line)

> +		return -EINVAL;
> +
> +	i3c_bus_normaluse_lock(&master->bus);
> +
> +	if (enable)
> +		ret = master->ops->enable_hotjoin(master);
> +	else
> +		ret = master->ops->disable_hotjoin(master);
> +
> +	master->hotjoin = enable;
> +
> +	i3c_bus_normaluse_unlock(&master->bus);
> +
> +	return ret;
> +}
> +
> +static ssize_t hotjoin_store(struct device *dev, struct device_attribute *attr,
> +			     const char *buf, size_t count)
> +{
> +	struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
> +	int ret;
> +	long res;
> +
> +	if (!i3cbus->cur_master)
> +		return -EINVAL;
> +
> +	if (kstrtol(buf, 10, &res))
> +		return -EINVAL;

Isn't there a better approach to get a y/n answer in sysfs?

> +
> +	ret = i3c_set_hotjoin(i3cbus->cur_master->common.master, !!res);
> +	if (ret)
> +		return ret;
> +
> +	return count;
> +}
> +

Thanks,
Miquèl