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authorAntonino A. Daplas <adaplas@gmail.com>2006-06-26 00:27:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:33 -0700
commit3e795de7631b2366d7301182c8d91f6d2911467b (patch)
treee119d2eec9825ad86c2b07e43d2bb06e7d558858 /include/linux/console.h
parenta4a73e1f0283850edc143d28502c1c517c6ab49c (diff)
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[PATCH] VT binding: Add binding/unbinding support for the VT console
The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/console.h')
-rw-r--r--include/linux/console.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/console.h b/include/linux/console.h
index d0f8a8009490..3bdf2155e565 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -63,9 +63,11 @@ extern const struct consw vga_con; /* VGA text console */
extern const struct consw newport_con; /* SGI Newport console */
extern const struct consw prom_con; /* SPARC PROM console */
+int con_is_bound(const struct consw *csw);
+int register_con_driver(const struct consw *csw, int first, int last);
+int unregister_con_driver(const struct consw *csw);
int take_over_console(const struct consw *sw, int first, int last, int deflt);
void give_up_console(const struct consw *sw);
-
/* scroll */
#define SM_UP (1)
#define SM_DOWN (2)