1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index a8ec48ed14d..76407eca9ab 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -236,6 +236,14 @@ enum {
 };
 
 /*
+ * /sys/class/tty/tty0/
+ *
+ * the attribute 'active' contains the name of the current vc
+ * console and it supports poll() to detect vc switches
+ */
+static struct device *tty0dev;
+
+/*
  * Notifier list for console events.
  */
 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
@@ -688,6 +696,8 @@ void redraw_screen(struct vc_data *vc, int is_switch)
                         save_screen(old_vc);
                         set_origin(old_vc);
                 }
+                if (tty0dev)
+                        sysfs_notify(&tty0dev->kobj, NULL, "active");
         } else {
                 hide_cursor(vc);
                 redraw = 1;
@@ -2967,13 +2977,24 @@ static const struct tty_operations con_ops = {
 
 static struct cdev vc0_cdev;
 
+static ssize_t show_tty_active(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "tty%d\n", fg_console + 1);
+}
+static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
+
 int __init vty_init(const struct file_operations *console_fops)
 {
         cdev_init(&vc0_cdev, console_fops);
         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
                 panic("Couldn't register /dev/tty0 driver\n");
-        device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
+        tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
+        if (IS_ERR(tty0dev))
+                tty0dev = NULL;
+        else
+                device_create_file(tty0dev, &dev_attr_active);
 
         vcs_init();