diff options
Diffstat (limited to 'drivers/thermal/thermal_core.c')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 4cdc3e32722..5045473485c 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -1754,6 +1754,44 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } EXPORT_SYMBOL(thermal_zone_device_unregister); +/** + * thermal_zone_get_zone_by_name() - search for a zone and returns its ref + * @name: thermal zone name to fetch the temperature + * + * When only one zone is found with the passed name, returns a reference to it. + * + * Return: On success returns a reference to an unique thermal zone with + * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid + * paramenters, -ENODEV for not found and -EEXIST for multiple matches). + */ +struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) +{ + struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); + unsigned int found = 0; + + if (!name) + goto exit; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(pos, &thermal_tz_list, node) + if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) { + found++; + ref = pos; + } + mutex_unlock(&thermal_list_lock); + + /* nothing has been found, thus an error code for it */ + if (found == 0) + ref = ERR_PTR(-ENODEV); + else if (found > 1) + /* Success only when an unique zone is found */ + ref = ERR_PTR(-EEXIST); + +exit: + return ref; +} +EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); + #ifdef CONFIG_NET static struct genl_family thermal_event_genl_family = { .id = GENL_ID_GENERATE, |