From: Daniel Willerud <daniel.willerud@xxxxxxxxxxxxxx>
We already have support for sysfs notifications when temperatures
measured by the ABx500 sensors exceed certain thresholds.
However we have in-kernel code that need to be notified when
such changes occur as well. So this patch adds a simple
notification mechanism to broadcast HWMON events in the kernel.
Reviewed-by: Jonas Aaberg <jonas.aberg@xxxxxxxxxxxxxx>
Signed-off-by: Daniel Willerud <daniel.willerud@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/hwmon/hwmon.c | 21 ++++++++++++++++++++-
include/linux/hwmon.h | 5 +++++
2 files changed, 25 insertions(+), 1 deletions(-)
diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index a61e781..b3c62f8 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -21,6 +21,7 @@
#include <linux/gfp.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
+#include <linux/notifier.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
@@ -29,7 +30,7 @@ static struct class *hwmon_class;
static DEFINE_IDR(hwmon_idr);
static DEFINE_SPINLOCK(idr_lock);
-
+static BLOCKING_NOTIFIER_HEAD(hwmon_notifier_list);
/**
* hwmon_device_register - register w/ hwmon
* @dev: the device to register
@@ -89,6 +90,24 @@ void hwmon_device_unregister(struct device *dev)
"hwmon_device_unregister() failed: bad class ID!\n");
}
+int hwmon_notifier_register(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&hwmon_notifier_list, nb);
+}
+EXPORT_SYMBOL(hwmon_notifier_register);
+
+int hwmon_notifier_unregister(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&hwmon_notifier_list, nb);
+}
+EXPORT_SYMBOL(hwmon_notifier_unregister);
+
+void hwmon_notify(unsigned long val, void *v)
+{
+ blocking_notifier_call_chain(&hwmon_notifier_list, val, v);
+}
+EXPORT_SYMBOL(hwmon_notify);
+
static void __init hwmon_pci_quirks(void)
{
#if defined CONFIG_X86 && defined CONFIG_PCI
diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
index 6b6ee70..8e891b5 100644
--- a/include/linux/hwmon.h
+++ b/include/linux/hwmon.h
@@ -15,11 +15,16 @@
#define _HWMON_H_
#include <linux/device.h>
+#include <linux/notifier.h>
struct device *hwmon_device_register(struct device *dev);
void hwmon_device_unregister(struct device *dev);
+int hwmon_notifier_register(struct notifier_block *nb);
+int hwmon_notifier_unregister(struct notifier_block *nb);
+void hwmon_notify(unsigned long val, void *v);
+
/* Scale user input to sensible values */
static inline int SENSORS_LIMIT(long value, long low, long high)
{
--
1.7.3.2
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