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path: root/drivers/rtc/dev.c
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Diffstat (limited to 'drivers/rtc/dev.c')
-rw-r--r--drivers/rtc/dev.c33
1 files changed, 32 insertions, 1 deletions
diff --git a/drivers/rtc/dev.c b/drivers/rtc/dev.c
index 84feb2565abd..5b8ebe86124a 100644
--- a/drivers/rtc/dev.c
+++ b/drivers/rtc/dev.c
@@ -10,6 +10,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/compat.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/sched/signal.h>
@@ -360,7 +361,6 @@ static long rtc_dev_ioctl(struct file *file,
case RTC_IRQP_SET:
err = rtc_irq_set_freq(rtc, arg);
break;
-
case RTC_IRQP_READ:
err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
break;
@@ -399,6 +399,34 @@ done:
return err;
}
+#ifdef CONFIG_COMPAT
+#define RTC_IRQP_SET32 _IOW('p', 0x0c, __u32)
+#define RTC_IRQP_READ32 _IOR('p', 0x0b, __u32)
+#define RTC_EPOCH_SET32 _IOW('p', 0x0e, __u32)
+
+static long rtc_dev_compat_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct rtc_device *rtc = file->private_data;
+ void __user *uarg = compat_ptr(arg);
+
+ switch (cmd) {
+ case RTC_IRQP_READ32:
+ return put_user(rtc->irq_freq, (__u32 __user *)uarg);
+
+ case RTC_IRQP_SET32:
+ /* arg is a plain integer, not pointer */
+ return rtc_dev_ioctl(file, RTC_IRQP_SET, arg);
+
+ case RTC_EPOCH_SET32:
+ /* arg is a plain integer, not pointer */
+ return rtc_dev_ioctl(file, RTC_EPOCH_SET, arg);
+ }
+
+ return rtc_dev_ioctl(file, cmd, (unsigned long)uarg);
+}
+#endif
+
static int rtc_dev_fasync(int fd, struct file *file, int on)
{
struct rtc_device *rtc = file->private_data;
@@ -434,6 +462,9 @@ static const struct file_operations rtc_dev_fops = {
.read = rtc_dev_read,
.poll = rtc_dev_poll,
.unlocked_ioctl = rtc_dev_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = rtc_dev_compat_ioctl,
+#endif
.open = rtc_dev_open,
.release = rtc_dev_release,
.fasync = rtc_dev_fasync,