linux-kernel - Re: [PATCH] usb/core: Added devspec sysfs entry for devices behind usb hub

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Date:   Tue, 4 Oct 2016 21:49:32 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vijay Kumar <vijay.ac.kumar@...cle.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb/core: Added devspec sysfs entry for devices behind
 usb hub

On Tue, Oct 04, 2016 at 12:04:40PM -0700, Vijay Kumar wrote:
> Grub finds incorrect of_node path for devices behind usb hub.
> Added devspec sysfs entry for devices behind usb hub so that
> right of_node path is returned during grub sysfs walk for these
> devices.
> 
> Signed-off-by: Vijay Kumar <vijay.ac.kumar@...cle.com>
> 
> ---
>  drivers/usb/core/sysfs.c |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
> index c953a0f..84d66d5 100644
> --- a/drivers/usb/core/sysfs.c
> +++ b/drivers/usb/core/sysfs.c
> @@ -14,6 +14,7 @@
>  #include <linux/string.h>
>  #include <linux/usb.h>
>  #include <linux/usb/quirks.h>
> +#include <linux/of.h>
>  #include "usb.h"
>  
>  /* Active configuration fields */
> @@ -104,6 +105,17 @@ static ssize_t bConfigurationValue_store(struct device *dev,
>  static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
>  		bConfigurationValue_show, bConfigurationValue_store);
>  
> +#ifdef CONFIG_OF
> +static ssize_t devspec_show(struct device *dev, struct device_attribute *attr,
> +			     char *buf)
> +{
> +	struct device_node *of_node = dev->of_node;
> +
> +	return sprintf(buf, "%s\n", of_node_full_name(of_node));
> +}
> +static DEVICE_ATTR_RO(devspec);
> +#endif

Any way to do this without the #ifdef?

And you need to also update Documentation/ABI if you add a new sysfs
file.

thanks,

greg k-h