Re: [PATCH v2 08/10] hwmon: Support registration of thermal zones for SCP temperature sensors

Punit Agrawal
2015-08-05T10:17:41Z

Guenter Roeck <linux@roeck-us.net> writes:

> On 08/03/2015 08:22 AM, Punit Agrawal wrote:
>> Add support to create thermal zones based on the temperature sensors
>> provided by the SCP. The thermal zones can be defined using the
>> thermal DT bindings and should refer to the SCP sensor id to select
>> the sensor.
>>
>> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
>> Cc: Jean Delvare <jdelvare@suse.de>
>> Cc: Guenter Roeck <linux@roeck-us.net>
>> Cc: Eduardo Valentin <edubezval@gmail.com>
>
> Hi,
>
> assuming you fix up the nitpicks below,
>
> Acked-by: Guenter Roeck <linux@roeck-us.net>
>
>> ---
>> drivers/hwmon/scpi-hwmon.c | 103 ++++++++++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 102 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c
>> index 7e7e06b..d96a3e5 100644
>> --- a/drivers/hwmon/scpi-hwmon.c
>> +++ b/drivers/hwmon/scpi-hwmon.c
>> @@ -20,6 +20,7 @@
>> #include <linux/scpi_protocol.h>
>> #include <linux/slab.h>
>> #include <linux/sysfs.h>
>> +#include <linux/thermal.h>
>>
>> struct sensor_data {
>> struct scpi_sensor_info info;
>> @@ -29,14 +30,39 @@ struct sensor_data {
>> char label[20];
>> };
>>
>> +struct scpi_thermal_zone {
>> + struct list_head list;
>> + int sensor_id;
>> + struct scpi_sensors *scpi_sensors;
>> + struct thermal_zone_device *tzd;
>> +};
>> +
>> struct scpi_sensors {
>> struct scpi_ops *scpi_ops;
>> struct sensor_data *data;
>> + struct list_head thermal_zones;
>> struct attribute **attrs;
>> struct attribute_group group;
>> const struct attribute_group *groups[2];
>> };
>>
>> +static int scpi_read_temp(void *dev, long *temp)
>> +{
>> + struct scpi_thermal_zone *zone = dev;
>> + struct scpi_sensors *scpi_sensors = zone->scpi_sensors;
>> + struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
>> + struct sensor_data *sensor = &scpi_sensors->data[zone->sensor_id];
>> + u32 value;
>> + int ret;
>> +
>> + ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
>> + if (ret)
>> + return ret;
>> +
>> + *temp = value;
>> + return 0;
>> +}
>> +
>> /* hwmon callback functions */
>> static ssize_t
>> scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
>> @@ -66,6 +92,24 @@ scpi_show_label(struct device *dev, struct device_attribute *attr, char *buf)
>> return sprintf(buf, "%s\n", sensor->info.name);
>> }
>>
>> +static void
>> +unregister_thermal_zones(struct platform_device *pdev,
>> + struct scpi_sensors *scpi_sensors)
>> +{
>> + struct list_head *pos;
>> +
>> + list_for_each(pos, &scpi_sensors->thermal_zones) {
>> + struct scpi_thermal_zone *zone;
>> +
>> + zone = list_entry(pos, struct scpi_thermal_zone, list);
>> + thermal_zone_of_sensor_unregister(&pdev->dev, zone->tzd);
>> + }
>> +}
>> +
>> +static struct thermal_zone_of_device_ops scpi_sensor_ops = {
>> + .get_temp = scpi_read_temp,
>> +};
>> +
>> static int scpi_hwmon_probe(struct platform_device *pdev)
>> {
>> u16 nr_sensors, i;
>> @@ -157,10 +201,66 @@ static int scpi_hwmon_probe(struct platform_device *pdev)
>> scpi_sensors->group.attrs = scpi_sensors->attrs;
>> scpi_sensors->groups[0] = &scpi_sensors->group;
>>
>> + platform_set_drvdata(pdev, scpi_sensors);
>> +
>> hwdev = devm_hwmon_device_register_with_groups(dev,
>> "scpi_sensors", scpi_sensors, scpi_sensors->groups);
>>
>> - return PTR_ERR_OR_ZERO(hwdev);
>> + if (IS_ERR(hwdev))
>> + return PTR_ERR(hwdev);
>> +
>> + /*
>> + * Register the temperature sensors with the thermal framework
>> + * to allow their usage in setting up the thermal zones from
>> + * device tree.
>> + *
>> + * NOTE: Not all temperature sensors maybe used for thermal
>> + * control
>> + */
>> + INIT_LIST_HEAD(&scpi_sensors->thermal_zones);
>> + for (i = 0; i < nr_sensors; i++) {
>> + struct sensor_data *sensor = &scpi_sensors->data[i];
>> + struct scpi_thermal_zone *zone;
>> +
>> + if (sensor->info.class != TEMPERATURE)
>> + continue;
>> +
>> + zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
>
> devm_kzalloc(dev, ...);
>
> for consistency.
>

Thought I'd fixed this up. Done now.

>> + if (!zone) {
>> + ret = -ENOMEM;
>> + goto unregister_tzd;
>> + }
>> +
>> + zone->sensor_id = i;
>> + zone->scpi_sensors = scpi_sensors;
>> + zone->tzd = thermal_zone_of_sensor_register(dev, i, zone,
>> + &scpi_sensor_ops);
>> + /*
>> + * The call to thermal_zone_of_sensor_register returns
>> + * an error for sensors that are not associated with
>> + * any thermal zones.
>
> ... or if the thermal subsystem is not configured.
>

Updated the comment.

Thanks for the ack.

I'll send out an updated version once you respond to Patch 4.

Thanks,
Punit

>> + */
>> + if (IS_ERR(zone->tzd)) {
>> + devm_kfree(dev, zone);
>> + continue;
>> + }
>> + list_add(&zone->list, &scpi_sensors->thermal_zones);
>> + }
>> +
>> + return 0;
>> +
>> +unregister_tzd:
>> + unregister_thermal_zones(pdev, scpi_sensors);
>> + return ret;
>> +}
>> +
>> +static int scpi_hwmon_remove(struct platform_device *pdev)
>> +{
>> + struct scpi_sensors *scpi_sensors = platform_get_drvdata(pdev);
>> +
>> + unregister_thermal_zones(pdev, scpi_sensors);
>> +
>> + return 0;
>> }
>>
>> static const struct of_device_id scpi_of_match[] = {
>> @@ -175,6 +275,7 @@ static struct platform_driver scpi_hwmon_platdrv = {
>> .of_match_table = scpi_of_match,
>> },
>> .probe = scpi_hwmon_probe,
>> + .remove = scpi_hwmon_remove,
>> };
>> module_platform_driver(scpi_hwmon_platdrv);
>>
>>
>
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