tty: add 'active' sysfs attribute to tty0 and console device

tty: add 'active' sysfs attribute to tty0 and console device

Userspace can query the actual virtual console, and the configured
console devices behind /dev/tt0 and /dev/console.

The last entry in the list of devices is the active device, analog
to the console= kernel command line option.

The attribute supports poll(), which is raised when the virtual
console is changed or /dev/console is reconfigured.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

index 0000000..b138b66

2 files changed, 65 insertions, 5 deletions

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c05c5af5aa04..be5ab4ac0b93 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3232,9 +3232,45 @@ static int __init tty_class_init(void)
 postcore_initcall(tty_class_init);
 
 /* 3/2004 jmc: why do these devices exist? */
-
 static struct cdev tty_cdev, console_cdev;
 
+static ssize_t show_cons_active(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        struct console *cs[16];
+        int i = 0;
+        struct console *c;
+        ssize_t count = 0;
+
+        acquire_console_sem();
+        for (c = console_drivers; c; c = c->next) {
+                if (!c->device)
+                        continue;
+                if (!c->write)
+                        continue;
+                if ((c->flags & CON_ENABLED) == 0)
+                        continue;
+                cs[i++] = c;
+                if (i >= ARRAY_SIZE(cs))
+                        break;
+        }
+        while (i--)
+                count += sprintf(buf + count, "%s%d%c",
+                                 cs[i]->name, cs[i]->index, i ? ' ':'\n');
+        release_console_sem();
+
+        return count;
+}
+static DEVICE_ATTR(active, S_IRUGO, show_cons_active, NULL);
+
+static struct device *consdev;
+
+void console_sysfs_notify(void)
+{
+        if (consdev)
+                sysfs_notify(&consdev->kobj, NULL, "active");
+}
+
 /*
  * Ok, now we can initialize the rest of the tty devices and can count
  * on memory allocations, interrupts etc..
@@ -3245,15 +3281,18 @@ int __init tty_init(void)
         if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
             register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)
                 panic("Couldn't register /dev/tty driver\n");
-        device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL,
-                              "tty");
+        device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty");
 
         cdev_init(&console_cdev, &console_fops);
         if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) ||
             register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0)
                 panic("Couldn't register /dev/console driver\n");
-        device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL,
+        consdev = device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL,
                               "console");
+        if (IS_ERR(consdev))
+                consdev = NULL;
+        else
+                device_create_file(consdev, &dev_attr_active);
 
 #ifdef CONFIG_VT
         vty_init(&console_fops);
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index a8ec48ed14d9..76407eca9ab0 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();