linux-kernel - Re: [PATCH 3/3] hwmon: (occ) Add new temperature sensor type

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Message-ID: <20200506155704.GA30543@roeck-us.net>
Date:   Wed, 6 May 2020 08:57:04 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-fsi@...ts.ozlabs.org, devicetree@...r.kernel.org,
        jdelvare@...e.com, alistair@...ple.id.au, joel@....id.au,
        jk@...abs.org, robh+dt@...nel.org
Subject: Re: [PATCH 3/3] hwmon: (occ) Add new temperature sensor type

On Fri, May 01, 2020 at 10:08:33AM -0500, Eddie James wrote:
> The latest version of the On-Chip Controller (OCC) has a different
> format for the temperature sensor data. Add a new temperature sensor
> version to handle this data.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

For my reference:

Acked-by: Guenter Roeck <linux@...ck-us.net>

I assume this depends on at least patch 2 of the series, so we'll have
to wait for that to be accepted.

Guenter

> ---
>  drivers/hwmon/occ/common.c | 75 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 75 insertions(+)
> 
> diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> index 30e18eb60da7..52af0e728232 100644
> --- a/drivers/hwmon/occ/common.c
> +++ b/drivers/hwmon/occ/common.c
> @@ -41,6 +41,14 @@ struct temp_sensor_2 {
>  	u8 value;
>  } __packed;
>  
> +struct temp_sensor_10 {
> +	u32 sensor_id;
> +	u8 fru_type;
> +	u8 value;
> +	u8 throttle;
> +	u8 reserved;
> +} __packed;
> +
>  struct freq_sensor_1 {
>  	u16 sensor_id;
>  	u16 value;
> @@ -307,6 +315,60 @@ static ssize_t occ_show_temp_2(struct device *dev,
>  	return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
>  }
>  
> +static ssize_t occ_show_temp_10(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	int rc;
> +	u32 val = 0;
> +	struct temp_sensor_10 *temp;
> +	struct occ *occ = dev_get_drvdata(dev);
> +	struct occ_sensors *sensors = &occ->sensors;
> +	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> +
> +	rc = occ_update_response(occ);
> +	if (rc)
> +		return rc;
> +
> +	temp = ((struct temp_sensor_10 *)sensors->temp.data) + sattr->index;
> +
> +	switch (sattr->nr) {
> +	case 0:
> +		val = get_unaligned_be32(&temp->sensor_id);
> +		break;
> +	case 1:
> +		val = temp->value;
> +		if (val == OCC_TEMP_SENSOR_FAULT)
> +			return -EREMOTEIO;
> +
> +		/*
> +		 * VRM doesn't return temperature, only alarm bit. This
> +		 * attribute maps to tempX_alarm instead of tempX_input for
> +		 * VRM
> +		 */
> +		if (temp->fru_type != OCC_FRU_TYPE_VRM) {
> +			/* sensor not ready */
> +			if (val == 0)
> +				return -EAGAIN;
> +
> +			val *= 1000;
> +		}
> +		break;
> +	case 2:
> +		val = temp->fru_type;
> +		break;
> +	case 3:
> +		val = temp->value == OCC_TEMP_SENSOR_FAULT;
> +		break;
> +	case 4:
> +		val = temp->throttle * 1000;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
> +}
> +
>  static ssize_t occ_show_freq_1(struct device *dev,
>  			       struct device_attribute *attr, char *buf)
>  {
> @@ -745,6 +807,10 @@ static int occ_setup_sensor_attrs(struct occ *occ)
>  		num_attrs += (sensors->temp.num_sensors * 4);
>  		show_temp = occ_show_temp_2;
>  		break;
> +	case 0x10:
> +		num_attrs += (sensors->temp.num_sensors * 5);
> +		show_temp = occ_show_temp_10;
> +		break;
>  	default:
>  		sensors->temp.num_sensors = 0;
>  	}
> @@ -844,6 +910,15 @@ static int occ_setup_sensor_attrs(struct occ *occ)
>  			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
>  						     show_temp, NULL, 3, i);
>  			attr++;
> +
> +			if (sensors->temp.version == 0x10) {
> +				snprintf(attr->name, sizeof(attr->name),
> +					 "temp%d_max", s);
> +				attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
> +							     show_temp, NULL,
> +							     4, i);
> +				attr++;
> +			}
>  		}
>  	}
>