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86 lines
2.4 KiB
Diff
86 lines
2.4 KiB
Diff
From 5b622cb2d6ff44b1fb0750beee61f93f2c00548a Mon Sep 17 00:00:00 2001
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From: Sascha Hauer <s.hauer@pengutronix.de>
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Date: Wed, 13 May 2015 10:52:36 +0200
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Subject: [PATCH 17/76] thermal: Allow sensor ops to fail with -ENOSYS
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The thermal core uses the existence of the .get_temp, .get_trend and
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.set_emul_temp to detect whether this operation exists and should be
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used or whether it should be emulated in software. This makes problems
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for of-thermal which has to modify the struct thermal_zone_device_ops
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during runtime whenever a sensor is registered or unregistered.
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Let the core test for -ENOSYS from these callbacks and treat it like
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if the callbacks were not present.
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This allows of-thermal to always set the sensor related callbacks and
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to make struct thermal_zone_device_ops const again.
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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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---
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drivers/thermal/thermal_core.c | 24 +++++++++++++++++-------
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1 file changed, 17 insertions(+), 7 deletions(-)
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--- a/drivers/thermal/thermal_core.c
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+++ b/drivers/thermal/thermal_core.c
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@@ -416,13 +416,16 @@ static void handle_thermal_trip(struct t
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*/
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int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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- int ret = -EINVAL;
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+ int ret;
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int count;
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int crit_temp = INT_MAX;
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enum thermal_trip_type type;
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- if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
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- goto exit;
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+ if (!tz || IS_ERR(tz))
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+ return -EINVAL;
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+
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+ if (!tz->ops->get_temp)
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+ return -ENOSYS;
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mutex_lock(&tz->lock);
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@@ -448,7 +451,7 @@ int thermal_zone_get_temp(struct thermal
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}
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mutex_unlock(&tz->lock);
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-exit:
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+
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return ret;
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
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@@ -460,10 +463,11 @@ void thermal_zone_device_update(struct t
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if (atomic_read(&in_suspend))
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return;
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- if (!tz->ops->get_temp)
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+ ret = thermal_zone_get_temp(tz, &temp);
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+
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+ if (ret == -ENOSYS)
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return;
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- ret = thermal_zone_get_temp(tz, &temp);
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if (ret) {
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if (ret != -EAGAIN)
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dev_warn(&tz->device,
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@@ -803,10 +807,16 @@ emul_temp_store(struct device *dev, stru
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if (kstrtoul(buf, 10, &temperature))
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return -EINVAL;
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- if (!tz->ops->set_emul_temp) {
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+ if (tz->ops->set_emul_temp)
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+ ret = tz->ops->set_emul_temp(tz, temperature);
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+ else
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+ ret = -ENOSYS;
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+
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+ if (ret == -ENOSYS) {
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mutex_lock(&tz->lock);
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tz->emul_temperature = temperature;
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mutex_unlock(&tz->lock);
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+ ret = 0;
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} else {
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ret = tz->ops->set_emul_temp(tz, temperature);
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}
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