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Message-ID: <1384285582-16933-2-git-send-email-eduardo.valentin@ti.com>
Date: Tue, 12 Nov 2013 15:46:03 -0400
From: Eduardo Valentin <eduardo.valentin@...com>
To: <swarren@...dotorg.org>, <pawel.moll@....com>,
<mark.rutland@....com>, <ian.campbell@...rix.com>,
<rob.herring@...xeda.com>, <linux@...ck-us.net>,
<rui.zhang@...el.com>
CC: <wni@...dia.com>, <grant.likely@...aro.org>,
<durgadoss.r@...el.com>, <linux-pm@...r.kernel.org>,
<devicetree@...r.kernel.org>, <lm-sensors@...sensors.org>,
<linux-kernel@...r.kernel.org>,
Eduardo Valentin <eduardo.valentin@...com>
Subject: [PATCHv5 01/20] 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@...el.com>
Cc: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
---
drivers/thermal/thermal_core.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 03a5671..f4c9021 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -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)
--
1.8.2.1.342.gfa7285d
--
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