linux-kernel - Re: [PATCH v2] driver core: Add sysfs support for physical location of a device

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Date:   Fri, 4 Mar 2022 19:47:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Won Chung <wonchung@...gle.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] driver core: Add sysfs support for physical location
 of a device

On Fri, Mar 04, 2022 at 06:21:52PM +0000, Won Chung wrote:
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-devices-physical_location
> @@ -0,0 +1,42 @@
> +What:		/sys/devices/.../physical_location
> +Date:		March 2022
> +Contact:	Won Chung <wonchung@...gle.com>
> +Description:
> +		This directory contains information on physical location of
> +		the device connection point with respect to the system's
> +		housing.
> +
> +What:           /sys/devices/.../physical_location/panel
> +Date:           March 2022
> +Contact:        Won Chung <wonchung@...gle.com>
> +Description:

Use tabs everywhere please, stop mixing spaces and tabs in the same file
:(

> +static ssize_t panel_show(struct device *dev, struct device_attribute *attr,
> +	char *buf)
> +{
> +	const char *panel;
> +
> +	switch (dev->location.panel) {
> +	case DEVICE_PANEL_TOP:
> +		panel = "top";
> +		break;
> +	case DEVICE_PANEL_BOTTOM:
> +		panel = "bottom";
> +		break;
> +	case DEVICE_PANEL_LEFT:
> +		panel = "left";
> +		break;
> +	case DEVICE_PANEL_RIGHT:
> +		panel = "right";
> +		break;
> +	case DEVICE_PANEL_FRONT:
> +		panel = "front";
> +		break;
> +	case DEVICE_PANEL_BACK:
> +		panel = "back";
> +		break;
> +	default:
> +		panel = "unknown";
> +	}
> +	return sprintf(buf, "%s\n", panel);

Always use sysfs_emit() for new sysfs files.

thanks,

greg k-h