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char: ttyprintk: register console 

Register a console in the ttyprintk driver so that it can be selected
for /dev/console with console=ttyprintk on the kernel command line,
similar to other console drivers.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20220215141750.92808-1-vincent.whitchurch@axis.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vincent Whitchurch 2022-02-15 15:17:49 +01:00 committed by Greg Kroah-Hartman
parent 8f3631f0f6
commit 7ea4aa70bf
2 changed files with 18 additions and 1 deletions
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3
drivers/char/Kconfig
View File

@ -18,7 +18,8 @@ config TTY_PRINTK
The feature is useful to inline user messages with kernel
messages.
In order to use this feature, you should output user messages
to /dev/ttyprintk or redirect console to this TTY.
to /dev/ttyprintk or redirect console to this TTY, or boot
the kernel with console=ttyprintk.
If unsure, say N.

16
drivers/char/ttyprintk.c
View File

@ -11,6 +11,7 @@
* of the boot process, for example.
*/
#include <linux/console.h>
#include <linux/device.h>
#include <linux/serial.h>
#include <linux/tty.h>
@ -163,6 +164,18 @@ static const struct tty_port_operations tpk_port_ops = {
static struct tty_driver *ttyprintk_driver;
static struct tty_driver *ttyprintk_console_device(struct console *c,
int *index)
{
*index = 0;
return ttyprintk_driver;
}
static struct console ttyprintk_console = {
.name = "ttyprintk",
.device = ttyprintk_console_device,
};
static int __init ttyprintk_init(void)
{
int ret;
@ -195,6 +208,8 @@ static int __init ttyprintk_init(void)
goto error;
}
register_console(&ttyprintk_console);
return 0;
error:
@ -205,6 +220,7 @@ error:
static void __exit ttyprintk_exit(void)
{
unregister_console(&ttyprintk_console);
tty_unregister_driver(ttyprintk_driver);
tty_driver_kref_put(ttyprintk_driver);
tty_port_destroy(&tpk_port.port);