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Subjecttty: add 'active' sysfs attribute to tty0 and console device
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Date
commit be0d5f02c9194fe41c1aad11d7282db117bda938
Author: Kay Sievers <kay.sievers@vrfy.org>
Date: Tue Nov 9 18:53:59 2010 +0100

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>

diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty
new file mode 100644
index 0000000..b138b66
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-tty
@@ -0,0 +1,19 @@
+What: /sys/class/tty/console/active
+Date: Nov 2010
+Contact: Kay Sievers <kay.sievers@vrfy.org>
+Description:
+ Shows the list of currently configured
+ console devices, like 'tty1 ttyS0'.
+ The last entry in the file is the active
+ device connected to /dev/console.
+ The file supports poll() to detect virtual
+ console switches.
+
+What: /sys/class/tty/tty0/active
+Date: Nov 2010
+Contact: Kay Sievers <kay.sievers@vrfy.org>
+Description:
+ Shows the currently active virtual console
+ device, like 'tty1'.
+ The file supports poll() to detect virtual
+ console switches.
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c05c5af..be5ab4a 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 a8ec48e..76407ec 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();

diff --git a/include/linux/console.h b/include/linux/console.h
index 95cf6f0..0752d92 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -145,7 +145,7 @@ extern int is_console_locked(void);
extern int braille_register_console(struct console *, int index,
char *console_options, char *braille_options);
extern int braille_unregister_console(struct console *);
-
+extern void console_sysfs_notify(void);
extern int console_suspend_enabled;

/* Suspend and resume console messages over PM events */
diff --git a/kernel/printk.c b/kernel/printk.c
index 9a2264f..16f2084 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1357,6 +1357,7 @@ void register_console(struct console *newcon)
spin_unlock_irqrestore(&logbuf_lock, flags);
}
release_console_sem();
+ console_sysfs_notify();

/*
* By unregistering the bootconsoles after we enable the real console
@@ -1415,6 +1416,7 @@ int unregister_console(struct console *console)
console_drivers->flags |= CON_CONSDEV;

release_console_sem();
+ console_sysfs_notify();
return res;
}
EXPORT_SYMBOL(unregister_console);



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