linux-kernel - Re: [PATCH 2/2] net: dsa: register hwmon for any provided function

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Date:	Thu, 16 Apr 2015 14:26:38 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH 2/2] net: dsa: register hwmon for any provided function

On Thu, Apr 16, 2015 at 02:38:19PM -0400, Vivien Didelot wrote:
> A switch driver may only provide one of the temperature limit accessors,
> or the temperature alarm getter. So register the hwmon subsystem if any
> of the related functions is provided.
> 
> Thus, check get_temp to set the visibility of temp1_input.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---
>  net/dsa/dsa.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 67d2983..6b68994 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -157,6 +157,10 @@ static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
>  	umode_t mode = 0;
>  
>  	switch (index) {
> +	case 0: /* temp1_input */
> +		if (drv->get_temp)
> +			mode |= S_IRUGO;

This should be mandatory. Sorry, I don't really understand what you are
trying to accomplish here.

Can you give me a real world example where a chip would support setting
a limit but not reading it ?

Thanks,
Guenter

> +		break;
>  	case 1: /* temp1_max */
>  		if (drv->get_temp_limit)
>  			mode |= S_IRUGO;
> @@ -310,7 +314,8 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
>  	 * register with hardware monitoring subsystem.
>  	 * Treat registration error as non-fatal and ignore it.
>  	 */
> -	if (drv->get_temp) {
> +	if (drv->get_temp || drv->get_temp_limit || drv->set_temp_limit ||
> +	    drv->get_temp_alarm) {
>  		const char *netname = netdev_name(dst->master_netdev);
>  		char hname[IFNAMSIZ + 1];
>  		int i, j;
> -- 
> 2.3.5
> 
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