diff options
| -rw-r--r-- | drivers/hwmon/scpi-hwmon.c | 104 |
1 files changed, 103 insertions, 1 deletions
diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c index c7d1d1423427..2c1241bbf9af 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, int *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; @@ -160,10 +204,67 @@ 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(dev, sizeof(*zone), GFP_KERNEL); + 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. + */ + 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[] = { @@ -178,6 +279,7 @@ 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); |