diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
index e99c4ed7e677..33a4bcdaa4d7 100644
--- a/drivers/acpi/acpi_tad.c
+++ b/drivers/acpi/acpi_tad.c
@@ -52,6 +52,201 @@ struct acpi_tad_driver_data {
 	u32 capabilities;
 };
 
+struct acpi_tad_rt {
+	u16 year;  /* 1900 - 9999 */
+	u8 month;  /* 1 - 12 */
+	u8 day;    /* 1 - 31 */
+	u8 hour;   /* 0 - 23 */
+	u8 minute; /* 0 - 59 */
+	u8 second; /* 0 - 59 */
+	u8 valid;  /* 0 (failed) or 1 (success) for reads, 0 for writes */
+	u16 msec;  /* 1 - 1000 */
+	s16 tz;    /* -1440 to 1440 or 2047 (unspecified) */
+	u8 daylight;
+	u8 padding[3]; /* must be 0 */
+} __packed;
+
+static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_BUFFER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	if (rt->year < 1900 || rt->year > 9999 ||
+	    rt->month < 1 || rt->month > 12 ||
+	    rt->hour > 23 || rt->minute > 59 || rt->second > 59 ||
+	    rt->tz < -1440 || (rt->tz > 1440 && rt->tz != 2047) ||
+	    rt->daylight > 3)
+		return -ERANGE;
+
+	args[0].buffer.pointer = (u8 *)rt;
+	args[0].buffer.length = sizeof(*rt);
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, "_SRT", &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status) || retval)
+		return -EIO;
+
+	return 0;
+}
+
+static int acpi_tad_get_real_time(struct device *dev, struct acpi_tad_rt *rt)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER };
+	union acpi_object *out_obj;
+	struct acpi_tad_rt *data;
+	acpi_status status;
+	int ret = -EIO;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_object(handle, "_GRT", NULL, &output);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status))
+		goto out_free;
+
+	out_obj = output.pointer;
+	if (out_obj->type != ACPI_TYPE_BUFFER)
+		goto out_free;
+
+	if (out_obj->buffer.length != sizeof(*rt))
+		goto out_free;
+
+	data = (struct acpi_tad_rt *)(out_obj->buffer.pointer);
+	if (!data->valid)
+		goto out_free;
+
+	memcpy(rt, data, sizeof(*rt));
+	ret = 0;
+
+out_free:
+	ACPI_FREE(output.pointer);
+	return ret;
+}
+
+static char *acpi_tad_rt_next_field(char *s, int *val)
+{
+	char *p;
+
+	p = strchr(s, ':');
+	if (!p)
+		return NULL;
+
+	*p = '\0';
+	if (kstrtoint(s, 10, val))
+		return NULL;
+
+	return p + 1;
+}
+
+static ssize_t time_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct acpi_tad_rt rt;
+	char *str, *s;
+	int val, ret = -ENODATA;
+
+	str = kmemdup_nul(buf, count, GFP_KERNEL);
+	if (!str)
+		return -ENOMEM;
+
+	s = acpi_tad_rt_next_field(str, &val);
+	if (!s)
+		goto out_free;
+
+	rt.year = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.month = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.day = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.hour = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.minute = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.second = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.tz = val;
+
+	if (kstrtoint(s, 10, &val))
+		goto out_free;
+
+	rt.daylight = val;
+
+	rt.valid = 0;
+	rt.msec = 0;
+	memset(rt.padding, 0, 3);
+
+	ret = acpi_tad_set_real_time(dev, &rt);
+
+out_free:
+	kfree(str);
+	return ret ? ret : count;
+}
+
+static ssize_t time_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct acpi_tad_rt rt;
+	int ret;
+
+	ret = acpi_tad_get_real_time(dev, &rt);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u:%u:%u:%u:%u:%u:%d:%u\n",
+		       rt.year, rt.month, rt.day, rt.hour, rt.minute, rt.second,
+		       rt.tz, rt.daylight);
+}
+
+static DEVICE_ATTR(time, S_IRUSR | S_IWUSR, time_show, time_store);
+
+static struct attribute *acpi_tad_time_attrs[] = {
+	&dev_attr_time.attr,
+	NULL,
+};
+static const struct attribute_group acpi_tad_time_attr_group = {
+	.attrs	= acpi_tad_time_attrs,
+};
+
 static int acpi_tad_wake_set(struct device *dev, char *method, u32 timer_id,
 			     u32 value)
 {
@@ -448,6 +643,12 @@ static int acpi_tad_probe(struct platform_device *pdev)
 			goto fail;
 	}
 
+	if (caps & ACPI_TAD_RT) {
+		ret = sysfs_create_group(&dev->kobj, &acpi_tad_time_attr_group);
+		if (ret)
+			goto fail;
+	}
+
 	return 0;
 
 fail: