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>

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 5e414ca..499f473 100644 (file)
--- 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
@@ -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: