linux-kernel - Re: [PATCH] hwmon: (ibmpowernv) Add min/max attributes and current sensors

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Date:   Fri, 21 Apr 2017 13:47:50 +0200
From:   Cédric Le Goater <clg@...d.org>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-hwmon@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, svaidy@...ux.vnet.ibm.com,
        ego@...ux.vnet.ibm.com, akshay.adiga@...ux.vnet.ibm.com,
        andrew@...id.au
Subject: Re: [PATCH] hwmon: (ibmpowernv) Add min/max attributes and current
 sensors

Hello Shilpasri,

On 04/21/2017 06:31 AM, Shilpasri G Bhat wrote:
> Add support for adding min/max values for the inband sensors copied by
> OCC to main memory. And also add current(mA) sensors to the list.
> 
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> ---
>  drivers/hwmon/ibmpowernv.c | 55 ++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 53 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
> index 6d2e660..1f329fa8 100644
> --- a/drivers/hwmon/ibmpowernv.c
> +++ b/drivers/hwmon/ibmpowernv.c
> @@ -50,6 +50,7 @@ enum sensors {
>  	TEMP,
>  	POWER_SUPPLY,
>  	POWER_INPUT,
> +	CURRENT,
>  	MAX_SENSOR_TYPE,
>  };
>  
> @@ -65,7 +66,8 @@ enum sensors {
>  	{"fan", "ibm,opal-sensor-cooling-fan"},
>  	{"temp", "ibm,opal-sensor-amb-temp"},
>  	{"in", "ibm,opal-sensor-power-supply"},
> -	{"power", "ibm,opal-sensor-power"}
> +	{"power", "ibm,opal-sensor-power"},
> +	{"curr"}, /* Follows newer device tree compatible ibm,opal-sensor */

why isn't there a compatible string ? 

>  };
>  
>  struct sensor_data {
> @@ -287,6 +289,7 @@ static int populate_attr_groups(struct platform_device *pdev)
>  	opal = of_find_node_by_path("/ibm,opal/sensors");
>  	for_each_child_of_node(opal, np) {
>  		const char *label;
> +		int len;
>  
>  		if (np->name == NULL)
>  			continue;
> @@ -298,10 +301,14 @@ static int populate_attr_groups(struct platform_device *pdev)
>  		sensor_groups[type].attr_count++;
>  
>  		/*
> -		 * add a new attribute for labels
> +		 * add attributes for labels, min and max
>  		 */
>  		if (!of_property_read_string(np, "label", &label))
>  			sensor_groups[type].attr_count++;

We are negating of_property_read_string() above, but not below.
I wonder why ? 
 
> +		if (of_find_property(np, "sensor-data-min", &len))
> +			sensor_groups[type].attr_count++;
> +		if (of_find_property(np, "sensor-data-max", &len))
> +			sensor_groups[type].attr_count++;
>  	}
>  
>  	of_node_put(opal);
> @@ -428,6 +435,50 @@ static int create_device_attrs(struct platform_device *pdev)
>  			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
>  				&sdata[count++].dev_attr.attr;
>  		}
> +
> +		if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
> +			switch (type) {
> +			case POWER_INPUT:
> +				attr_name = "input_highest";
> +				break;
> +			case TEMP:
> +				attr_name = "max";
> +				break;
> +			default:
> +				attr_name = "highest";
> +				break;
> +			}

May be we could use a converting routine here ? create_device_attrs()
is getting big.

> +			sdata[count].id = sensor_id;
> +			sdata[count].type = type;
> +			sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
> +			create_hwmon_attr(&sdata[count], attr_name,
> +					  show_sensor);
> +			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
> +				&sdata[count++].dev_attr.attr;
> +		}
> +
> +		if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
> +			switch (type) {
> +			case POWER_INPUT:
> +				attr_name = "input_lowest";
> +				break;
> +			case TEMP:
> +				attr_name = "min";
> +				break;
> +			default:
> +				attr_name = "lowest";
> +				break;
> +			}

same here.

Thanks,

C.
> +			sdata[count].id = sensor_id;
> +			sdata[count].type = type;
> +			sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
> +			create_hwmon_attr(&sdata[count], attr_name,
> +					  show_sensor);
> +			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
> +				&sdata[count++].dev_attr.attr;
> +		}
>  	}
>  
>  exit_put_node:
>