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hwmon: (lm90) Add support to handle IRQ 

When the temperature exceed the limit range value,
the driver can handle the interrupt.

Signed-off-by: Wei Ni <wni@nvidia.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
hifive-unleashed-5.1
Wei Ni 2013-11-15 10:40:39 +01:00 committed by Jean Delvare
parent 072de4969f
commit 109b1283fb
1 changed files with 24 additions and 0 deletions
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24
drivers/hwmon/lm90.c
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@ -89,6 +89,7 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/interrupt.h>
/*
* Addresses to scan
@ -1445,6 +1446,17 @@ 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)
{
@ -1521,6 +1533,18 @@ 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: