consoles: polling support, kgdboc

[linux-2.6-omap-h63xx.git] / drivers / char / tty_io.c

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 613ec816ce606c004c07c24038bd169d90840c85..4d3c7018f0c3a9198093ace1ed28b69747a2209b 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -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
 }