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Date:   Sun, 14 May 2017 08:47:31 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        jdelvare@...e.com, paulus@...ba.org, 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, clg@...d.org
Subject: Re: [PATCH V4] hwmon: (ibmpowernv) Add highest/lowest attributes to
 sensors

On 05/06/2017 08:27 AM, Shilpasri G Bhat wrote:
> OCC provides historical minimum and maximum value for the sensor
> readings. This patch exports them as highest and lowest attributes
> for the inband sensors copied by OCC to main memory.
>
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> ---
> Changes from V3:
> - Removed extra variable 'hwmon_index'
> - Retain the initialization of sensor_data for *_input attribute in
>   create_device_attrs(), otherwise all the sensors from different
>   classes will numbered continuously.
>
>  drivers/hwmon/ibmpowernv.c | 69 +++++++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 62 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
> index 6d2e660..862b832 100644
> --- a/drivers/hwmon/ibmpowernv.c
> +++ b/drivers/hwmon/ibmpowernv.c
> @@ -287,6 +287,7 @@ 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 +299,14 @@ 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++;
> +		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++;

len isn't used, so you can just pass NULL and avoid the unnecessary variable.

>  	}
>
>  	of_node_put(opal);
> @@ -337,6 +342,41 @@ static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
>  	sdata->dev_attr.show = show;
>  }
>
> +static void populate_sensor(struct sensor_data *sdata, int od, int hd, int sid,
> +			    const char *attr_name, enum sensors type,
> +			    const struct attribute_group *pgroup,
> +			    ssize_t (*show)(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf))
> +{
> +	sdata->id = sid;
> +	sdata->type = type;
> +	sdata->opal_index = od;
> +	sdata->hwmon_index = hd;
> +	create_hwmon_attr(sdata, attr_name, show);
> +	pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr;
> +}
> +
> +static char *get_max_attr(enum sensors type)
> +{
> +	switch (type) {
> +	case POWER_INPUT:
> +		return "input_highest";
> +	default:
> +		return "highest";
> +	}
> +}
> +
> +static char *get_min_attr(enum sensors type)
> +{
> +	switch (type) {
> +	case POWER_INPUT:
> +		return "input_lowest";
> +	default:
> +		return "lowest";
> +	}
> +}
> +
>  /*
>   * Iterate through the device tree for each child of 'sensors' node, create
>   * a sysfs attribute file, the file is named by translating the DT node name
> @@ -417,16 +457,31 @@ static int create_device_attrs(struct platform_device *pdev)
>  			 * attribute. They are related to the same
>  			 * sensor.
>  			 */
> -			sdata[count].type = type;
> -			sdata[count].opal_index = sdata[count - 1].opal_index;
> -			sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
>
>  			make_sensor_label(np, &sdata[count], label);
> +			populate_sensor(&sdata[count], opal_index,
> +					sdata[count - 1].hwmon_index,
> +					sensor_id, "label", type, pgroups[type],
> +					show_label);
> +			count++;
> +		}
>
> -			create_hwmon_attr(&sdata[count], "label", show_label);
> +		if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
> +			attr_name = get_max_attr(type);
> +			populate_sensor(&sdata[count], opal_index,
> +					sdata[count - 1].hwmon_index,
> +					sensor_id, attr_name, type,
> +					pgroups[type], show_sensor);
> +			count++;
> +		}
>
> -			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
> -				&sdata[count++].dev_attr.attr;
> +		if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
> +			attr_name = get_min_attr(type);
> +			populate_sensor(&sdata[count], opal_index,
> +					sdata[count - 1].hwmon_index,
> +					sensor_id, attr_name, type,
> +					pgroups[type], show_sensor);
> +			count++;
>  		}
>  	}
>
>

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