s390/3270: introduce device notifier
Add a notifier to create / destroy the device nodes for the tty view
and the fullscreen view. Only device nodes for online devices are
created and the device names will follow the convention as outlined
in Documentation/devices.txt: 3270/tty<x> for the tty nodes,
3270/tub<x> for hte fullscreen nodes and 3270/tub for the fullscreen
control node.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index 5e4b6fc..48767e6 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -829,9 +829,8 @@
{
int i;
- for (i = 0; i < tty3270_max_index; i++) {
- struct raw3270_view *view =
- raw3270_find_view(&tty3270_fn, i + RAW3270_FIRSTMINOR);
+ for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) {
+ struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i);
if (!IS_ERR(view))
raw3270_del_view(view);
}
@@ -855,8 +854,7 @@
int i, rc;
/* Check if the tty3270 is already there. */
- view = raw3270_find_view(&tty3270_fn,
- tty->index + RAW3270_FIRSTMINOR);
+ view = raw3270_find_view(&tty3270_fn, tty->index);
if (!IS_ERR(view)) {
tp = container_of(view, struct tty3270, view);
tty->driver_data = tp;
@@ -868,8 +866,8 @@
tp->inattr = TF_INPUT;
return tty_port_install(&tp->port, driver, tty);
}
- if (tty3270_max_index < tty->index + 1)
- tty3270_max_index = tty->index + 1;
+ if (tty3270_max_index < tty->index)
+ tty3270_max_index = tty->index;
/* Quick exit if there is no device for tty->index. */
if (PTR_ERR(view) == -ENODEV)
@@ -880,8 +878,7 @@
if (IS_ERR(tp))
return PTR_ERR(tp);
- rc = raw3270_add_view(&tp->view, &tty3270_fn,
- tty->index + RAW3270_FIRSTMINOR);
+ rc = raw3270_add_view(&tp->view, &tty3270_fn, tty->index);
if (rc) {
tty3270_free_view(tp);
return rc;
@@ -1788,6 +1785,22 @@
.set_termios = tty3270_set_termios
};
+void tty3270_create_cb(int minor)
+{
+ tty_register_device(tty3270_driver, minor, NULL);
+}
+
+void tty3270_destroy_cb(int minor)
+{
+ tty_unregister_device(tty3270_driver, minor);
+}
+
+struct raw3270_notifier tty3270_notifier =
+{
+ .create = tty3270_create_cb,
+ .destroy = tty3270_destroy_cb,
+};
+
/*
* 3270 tty registration code called from tty_init().
* Most kernel services (incl. kmalloc) are available at this poimt.
@@ -1797,23 +1810,25 @@
struct tty_driver *driver;
int ret;
- driver = alloc_tty_driver(RAW3270_MAXDEVS);
- if (!driver)
- return -ENOMEM;
+ driver = tty_alloc_driver(RAW3270_MAXDEVS,
+ TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV |
+ TTY_DRIVER_RESET_TERMIOS);
+ if (IS_ERR(driver))
+ return PTR_ERR(driver);
/*
* Initialize the tty_driver structure
* Entries in tty3270_driver that are NOT initialized:
* proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
*/
- driver->driver_name = "ttyTUB";
- driver->name = "ttyTUB";
+ driver->driver_name = "tty3270";
+ driver->name = "3270/tty";
driver->major = IBM_TTY3270_MAJOR;
- driver->minor_start = RAW3270_FIRSTMINOR;
+ driver->minor_start = 0;
driver->type = TTY_DRIVER_TYPE_SYSTEM;
driver->subtype = SYSTEM_TYPE_TTY;
driver->init_termios = tty_std_termios;
- driver->flags = TTY_DRIVER_RESET_TERMIOS;
tty_set_operations(driver, &tty3270_ops);
ret = tty_register_driver(driver);
if (ret) {
@@ -1821,6 +1836,7 @@
return ret;
}
tty3270_driver = driver;
+ raw3270_register_notifier(&tty3270_notifier);
return 0;
}
@@ -1829,6 +1845,7 @@
{
struct tty_driver *driver;
+ raw3270_unregister_notifier(&tty3270_notifier);
driver = tty3270_driver;
tty3270_driver = NULL;
tty_unregister_driver(driver);