To enable this feature, CONFIG_VT_HW_CONSOLE_BINDING must be set to 'y'. This
feature will default to 'n' to minimize users accidentally corrupting their
virtual terminals.
Signed-off-by: Antonino Daplas <[email protected]>
---
drivers/char/Kconfig | 17 +++++++++++++++++
drivers/char/vt.c | 43 +++++++++++++++++++++++++++----------------
2 files changed, 44 insertions(+), 16 deletions(-)
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 29afe21..336aa31 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -62,6 +62,23 @@ config HW_CONSOLE
depends on VT && !S390 && !UML
default y
+config VT_HW_CONSOLE_BINDING
+ bool "Support for binding and unbinding console drivers"
+ depends on HW_CONSOLE
+ default n
+ ---help---
+ The virtual terminal is the device that interacts with the physical
+ terminal through console drivers. On these systems, at least one
+ console driver is loaded. In other configurations, additional console
+ drivers may be enabled, such as the framebuffer console. If more than
+ 1 console driver is enabled, setting this to 'y' will allow you to
+ select the console driver that will serve as the backend for the
+ virtual terminals.
+
+ See <file:Documentation/console/console.txt> for more
+ information. For framebuffer console users, please refer to
+ <file:Documentation/fb/fbcon.txt>.
+
config SERIAL_NONSTANDARD
bool "Non-standard serial port support"
---help---
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index d0cc421..1d98151 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2691,22 +2691,6 @@ #include <linux/device.h>
static struct class *vtconsole_class;
-static int con_is_graphics(const struct consw *csw, int first, int last)
-{
- int i, retval = 0;
-
- for (i = first; i <= last; i++) {
- struct vc_data *vc = vc_cons[i].d;
-
- if (vc && vc->vc_mode == KD_GRAPHICS) {
- retval = 1;
- break;
- }
- }
-
- return retval;
-}
-
static int bind_con_driver(const struct consw *csw, int first, int last,
int deflt)
{
@@ -2808,6 +2792,23 @@ err:
return retval;
};
+#ifdef CONFIG_VT_HW_CONSOLE_BINDING
+static int con_is_graphics(const struct consw *csw, int first, int last)
+{
+ int i, retval = 0;
+
+ for (i = first; i <= last; i++) {
+ struct vc_data *vc = vc_cons[i].d;
+
+ if (vc && vc->vc_mode == KD_GRAPHICS) {
+ retval = 1;
+ break;
+ }
+ }
+
+ return retval;
+}
+
static int unbind_con_driver(const struct consw *csw, int first, int last,
int deflt)
{
@@ -2977,6 +2978,16 @@ static int vt_unbind(struct con_driver *
err:
return 0;
}
+#else
+static inline int vt_bind(struct con_driver *con)
+{
+ return 0;
+}
+static inline int vt_unbind(struct con_driver *con)
+{
+ return 0;
+}
+#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
static ssize_t store_bind(struct class_device *class_device,
const char *buf, size_t count)
-
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