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consoles: polling support, kgdboc

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polled console handling support, to access a console in an irq-less
way while in debug or irq context.

absolutely zero impact as long as CONFIG_CONSOLE_POLL is disabled.
(which is the default)

[ jan.kiszka@siemens.com: lots of cleanups ]
[ mingo@elte.hu: redesign, splitups, cleanups. ]

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jason Wessel
2008-04-17 20:05:37 +02:00
committed by Ingo Molnar
parent dc7d552705
commit f2d937f3bf
8 changed files with 357 additions and 3 deletions
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47
drivers/char/tty_io.c
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@ -1155,6 +1155,48 @@ static struct tty_driver *get_tty_driver(dev_t device, int *index)
return NULL;
}
#ifdef CONFIG_CONSOLE_POLL
/**
* tty_find_polling_driver - find device of a polled tty
* @name: name string to match
* @line: pointer to resulting tty line nr
*
* This routine returns a tty driver structure, given a name
* and the condition that the tty driver is capable of polled
* operation.
*/
struct tty_driver *tty_find_polling_driver(char *name, int *line)
{
struct tty_driver *p, *res = NULL;
int tty_line = 0;
char *str;
mutex_lock(&tty_mutex);
/* Search through the tty devices to look for a match */
list_for_each_entry(p, &tty_drivers, tty_drivers) {
str = name + strlen(p->name);
tty_line = simple_strtoul(str, &str, 10);
if (*str == ',')
str++;
if (*str == '\0')
str = 0;
if (tty_line >= 0 && tty_line <= p->num && p->poll_init &&
!p->poll_init(p, tty_line, str)) {
res = p;
*line = tty_line;
break;
}
}
mutex_unlock(&tty_mutex);
return res;
}
EXPORT_SYMBOL_GPL(tty_find_polling_driver);
#endif
/**
* tty_check_change - check for POSIX terminal changes
* @tty: tty to check
@ -3850,6 +3892,11 @@ void tty_set_operations(struct tty_driver *driver,
driver->write_proc = op->write_proc;
driver->tiocmget = op->tiocmget;
driver->tiocmset = op->tiocmset;
#ifdef CONFIG_CONSOLE_POLL
driver->poll_init = op->poll_init;
driver->poll_get_char = op->poll_get_char;
driver->poll_put_char = op->poll_put_char;
#endif
}