When the temperature exceed the limit range value,
the driver can handle the interrupt.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/hwmon/lm90.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 57485ef..d55c25d 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -89,6 +89,7 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/interrupt.h>
/*
* Addresses to scan
@@ -1435,6 +1436,17 @@ static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
return true;
}
+static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
+{
+ struct i2c_client *client = dev_id;
+ u16 status;
+
+ if (lm90_is_tripped(client, &status))
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}
+
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1511,6 +1523,18 @@ static int lm90_probe(struct i2c_client *client,
goto exit_remove_files;
}
+ if (client->irq) {
+ dev_dbg(dev, "IRQ: %d\n", client->irq);
+ err = devm_request_threaded_irq(dev, client->irq,
+ NULL, lm90_irq_thread,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "lm90", client);
+ if (err < 0) {
+ dev_err(dev, "cannot request IRQ: %d\n", client->irq);
+ goto exit_remove_files;
+ }
+ }
+
return 0;
exit_remove_files:
--
1.7.9.5
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