rtc: s35390a: implement ioctls

Implements RTC_VL_READ and RTC_VL_CLR ioctls.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.co.uk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index 3aec3b225bc473fecc9da4654c4a6190a89347df..7067bca5c20d9d2c57777f40714db95b0c9a2fa0 100644 (file)
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -404,12 +404,42 @@ static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
        return s35390a_set_datetime(to_i2c_client(dev), tm);
 }
 
+static int s35390a_rtc_ioctl(struct device *dev, unsigned int cmd,
+                            unsigned long arg)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct s35390a *s35390a = i2c_get_clientdata(client);
+       char sts;
+       int err;
+
+       switch (cmd) {
+       case RTC_VL_READ:
+               /* s35390a_reset set lowvoltage flag and init RTC if needed */
+               err = s35390a_read_status(s35390a, &sts);
+               if (err < 0)
+                       return err;
+               if (copy_to_user((void __user *)arg, &err, sizeof(int)))
+                       return -EFAULT;
+               break;
+       case RTC_VL_CLR:
+               /* update flag and clear register */
+               err = s35390a_init(s35390a);
+               if (err < 0)
+                       return err;
+               break;
+       default:
+               return -ENOIOCTLCMD;
+       }
+
+       return 0;
+}
+
 static const struct rtc_class_ops s35390a_rtc_ops = {
        .read_time      = s35390a_rtc_read_time,
        .set_time       = s35390a_rtc_set_time,
        .set_alarm      = s35390a_rtc_set_alarm,
        .read_alarm     = s35390a_rtc_read_alarm,
-
+       .ioctl          = s35390a_rtc_ioctl,
 };
 
 static struct i2c_driver s35390a_driver;