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thermal: allow registering without .get_temp

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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>
This commit is contained in:
Eduardo Valentin 2013-09-12 19:15:44 -04:00
parent dc1ccc4815
commit 81bd4e1ceb
1 changed files with 8 additions and 2 deletions
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10
drivers/thermal/thermal_core.c
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@ -403,7 +403,7 @@ 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);
@ -456,6 +456,9 @@ 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++)
@ -1386,7 +1389,7 @@ 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 || !ops->get_trip_temp))
@ -1490,6 +1493,9 @@ 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)