linux-kernel - Re: [PATCH v2 2/4] i3c: Add modalias sysfs attribute

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Date:   Thu, 27 Feb 2020 15:41:15 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     pgaj@...ence.com, bbrezillon@...nel.org,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] i3c: Add modalias sysfs attribute

On Thu, 27 Feb 2020 12:31:07 +0100
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> Create modalias sysfs attribute for modalias devices.

					^i3c

No need to send a new version, I'll fix it when applying.

> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
> Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> ---
>  drivers/i3c/master.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index b6db828..925e1ed 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -241,12 +241,34 @@ static ssize_t hdrcap_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(hdrcap);
>  
> +static ssize_t modalias_show(struct device *dev,
> +			     struct device_attribute *da, char *buf)
> +{
> +	struct i3c_device *i3c = dev_to_i3cdev(dev);
> +	struct i3c_device_info devinfo;
> +	u16 manuf, part, ext;
> +
> +	i3c_device_get_info(i3c, &devinfo);
> +	manuf = I3C_PID_MANUF_ID(devinfo.pid);
> +	part = I3C_PID_PART_ID(devinfo.pid);
> +	ext = I3C_PID_EXTRA_INFO(devinfo.pid);
> +
> +	if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
> +		return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
> +			       manuf);
> +
> +	return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
> +		       devinfo.dcr, manuf, part, ext);
> +}
> +static DEVICE_ATTR_RO(modalias);
> +
>  static struct attribute *i3c_device_attrs[] = {
>  	&dev_attr_bcr.attr,
>  	&dev_attr_dcr.attr,
>  	&dev_attr_pid.attr,
>  	&dev_attr_dynamic_address.attr,
>  	&dev_attr_hdrcap.attr,
> +	&dev_attr_modalias.attr,
>  	NULL,
>  };
>  ATTRIBUTE_GROUPS(i3c_device);