Messages in this thread Patch in this message | | | Date | Wed, 4 Dec 2019 13:56:18 -0800 | Subject | [PATCH v2 2/2] thermal: create softlink by name for thermal_zone and cooling_device | From | Wei Wang <> |
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The paths thermal_zone%d and cooling_device%d are not intuitive and the numbers are subject to change due to device tree change. This usually leads to tree traversal in userspace code. The patch creates `tz-by-name' and `cdev-by-name' for thermal zone and cooling_device respectively.
Signed-off-by: Wei Wang <wvw@google.com> --- drivers/thermal/thermal_core.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 64fbb59c2f44..4f55e3f16265 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -22,6 +22,7 @@ #include <net/netlink.h> #include <net/genetlink.h> #include <linux/suspend.h> +#include <linux/kobject.h> #define CREATE_TRACE_POINTS #include <trace/events/thermal.h> @@ -46,6 +47,8 @@ static DEFINE_MUTEX(poweroff_lock); static atomic_t in_suspend; static bool power_off_triggered; +static struct kobject *cdev_link_kobj; +static struct kobject *tz_link_kobj; static struct thermal_governor *def_governor; @@ -997,9 +1000,15 @@ __thermal_cooling_device_register(struct device_node *np, return ERR_PTR(result); } - /* Add 'this' new cdev to the global cdev list */ + /* Add 'this' new cdev to the global cdev list and create link*/ mutex_lock(&thermal_list_lock); list_add(&cdev->node, &thermal_cdev_list); + if (!cdev_link_kobj) + cdev_link_kobj = kobject_create_and_add("cdev-by-name", + cdev->device.kobj.parent); + if (!cdev_link_kobj || sysfs_create_link(cdev_link_kobj, + &cdev->device.kobj, cdev->type)) + dev_err(&cdev->device, "Failed to create cdev-by-name link\n"); mutex_unlock(&thermal_list_lock); /* Update binding information for 'this' new cdev */ @@ -1165,6 +1174,8 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) } } } + if (cdev_link_kobj) + sysfs_remove_link(cdev_link_kobj, cdev->type); mutex_unlock(&thermal_list_lock); @@ -1348,6 +1359,12 @@ thermal_zone_device_register(const char *type, int trips, int mask, mutex_lock(&thermal_list_lock); list_add_tail(&tz->node, &thermal_tz_list); + if (!tz_link_kobj) + tz_link_kobj = kobject_create_and_add("tz-by-name", + tz->device.kobj.parent); + if (!tz_link_kobj || sysfs_create_link(tz_link_kobj, + &tz->device.kobj, tz->type)) + dev_err(&tz->device, "Failed to create tz-by-name link\n"); mutex_unlock(&thermal_list_lock); /* Bind cooling devices for this zone */ @@ -1419,6 +1436,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } } } + if (tz_link_kobj) + sysfs_remove_link(tz_link_kobj, tz->type); mutex_unlock(&thermal_list_lock); -- 2.24.0.393.g34dc348eaf-goog
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