hwmon: (lm90) Disable interrupt on suspend

I2C accesses are prohibited and will error out after suspending of the
I2C controller, hence we need to ensure that interrupt won't fire on
suspend when it's too late. Disable interrupt across suspend/resume.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 658b486d2f5ea107ab0938e8945a3b5dc6301776..b53f17511b05492445b63f22cce8f6dc4041ee6c 100644 (file)
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1973,11 +1973,36 @@ static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
        }
 }
 
+static int __maybe_unused lm90_suspend(struct device *dev)
+{
+       struct lm90_data *data = dev_get_drvdata(dev);
+       struct i2c_client *client = data->client;
+
+       if (client->irq)
+               disable_irq(client->irq);
+
+       return 0;
+}
+
+static int __maybe_unused lm90_resume(struct device *dev)
+{
+       struct lm90_data *data = dev_get_drvdata(dev);
+       struct i2c_client *client = data->client;
+
+       if (client->irq)
+               enable_irq(client->irq);
+
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(lm90_pm_ops, lm90_suspend, lm90_resume);
+
 static struct i2c_driver lm90_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "lm90",
                .of_match_table = of_match_ptr(lm90_of_match),
+               .pm     = &lm90_pm_ops,
        },
        .probe_new      = lm90_probe,
        .alert          = lm90_alert,