diff options
| author | Eduardo Valentin <eduardo.valentin@ti.com> | 2013-09-12 19:15:44 -0400 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2014-03-31 15:47:20 +0800 |
| commit | 510a773b0f771bb320d2a59af049e1c0e7e12d4c (patch) | |
| tree | d570d7f2bd22c9a2433c2a1eac9ebad6a365cf72 /drivers | |
| parent | d3222d77b27a07a4b200d1b0b792e8e3bdf30396 (diff) | |
thermal: allow registering without .get_temp
This patch changes the thermal core driver to allow
registration of thermal zones without the .get_temp callback.
The idea behind this change is to allow lazy registration
of sensor callbacks.
The thermal zone will be disabled whenever the ops
does not contain a .get_temp callback. The sysfs interface
will be returning -EINVAL on any temperature read operation.
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
(cherry picked from commit 81bd4e1cebed5efb85bd94a15342ee4d6965a416)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index d755440791b..818cd787dbd 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -388,7 +388,7 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp) enum thermal_trip_type type; #endif - if (!tz || IS_ERR(tz)) + if (!tz || IS_ERR(tz) || !tz->ops->get_temp) goto exit; mutex_lock(&tz->lock); @@ -441,6 +441,9 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) { int count; + if (!tz->ops->get_temp) + return; + update_temperature(tz); for (count = 0; count < tz->trips; count++) @@ -1621,7 +1624,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) return ERR_PTR(-EINVAL); - if (!ops || !ops->get_temp) + if (!ops) return ERR_PTR(-EINVAL); if (trips > 0 && !ops->get_trip_type) @@ -1723,6 +1726,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check); + if (!tz->ops->get_temp) + thermal_zone_device_set_polling(tz, 0); + thermal_zone_device_update(tz); if (!result) |