iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

char: ttyprintk: register console

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/char/Kconfig
View File

@ -18,7 +18,8 @@ config TTY_PRINTK
The feature is useful to inline user messages with kernel The feature is useful to inline user messages with kernel
messages. messages.
In order to use this feature, you should output user 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. If unsure, say N.

16
drivers/char/ttyprintk.c
View File

@ -11,6 +11,7 @@
* of the boot process, for example. * of the boot process, for example.
*/ */
#include <linux/console.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/serial.h> #include <linux/serial.h>
#include <linux/tty.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_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) static int __init ttyprintk_init(void)
{ {
int ret; int ret;
@ -195,6 +208,8 @@ static int __init ttyprintk_init(void)
goto error; goto error;
} }
register_console(&ttyprintk_console);
return 0; return 0;
error: error:
@ -205,6 +220,7 @@ error:
static void __exit ttyprintk_exit(void) static void __exit ttyprintk_exit(void)
{ {
unregister_console(&ttyprintk_console);
tty_unregister_driver(ttyprintk_driver); tty_unregister_driver(ttyprintk_driver);
tty_driver_kref_put(ttyprintk_driver); tty_driver_kref_put(ttyprintk_driver);
tty_port_destroy(&tpk_port.port); tty_port_destroy(&tpk_port.port);