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path: root/drivers/tty/tty_port.c
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Diffstat (limited to 'drivers/tty/tty_port.c')
-rw-r--r--drivers/tty/tty_port.c46
1 files changed, 40 insertions, 6 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 1d8804843103..8d9886b06037 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -17,6 +17,44 @@
#include <linux/delay.h>
#include <linux/module.h>
+static int tty_port_default_receive_buf(struct tty_port *port,
+ const unsigned char *p,
+ const unsigned char *f, size_t count)
+{
+ int ret;
+ struct tty_struct *tty;
+ struct tty_ldisc *disc;
+
+ tty = READ_ONCE(port->itty);
+ if (!tty)
+ return 0;
+
+ disc = tty_ldisc_ref(tty);
+ if (!disc)
+ return 0;
+
+ ret = tty_ldisc_receive_buf(disc, p, (char *)f, count);
+
+ tty_ldisc_deref(disc);
+
+ return ret;
+}
+
+static void tty_port_default_wakeup(struct tty_port *port)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+
+ if (tty) {
+ tty_wakeup(tty);
+ tty_kref_put(tty);
+ }
+}
+
+static const struct tty_port_client_operations default_client_ops = {
+ .receive_buf = tty_port_default_receive_buf,
+ .write_wakeup = tty_port_default_wakeup,
+};
+
void tty_port_init(struct tty_port *port)
{
memset(port, 0, sizeof(*port));
@@ -28,6 +66,7 @@ void tty_port_init(struct tty_port *port)
spin_lock_init(&port->lock);
port->close_delay = (50 * HZ) / 100;
port->closing_wait = (3000 * HZ) / 100;
+ port->client_ops = &default_client_ops;
kref_init(&port->kref);
}
EXPORT_SYMBOL(tty_port_init);
@@ -272,12 +311,7 @@ EXPORT_SYMBOL_GPL(tty_port_tty_hangup);
*/
void tty_port_tty_wakeup(struct tty_port *port)
{
- struct tty_struct *tty = tty_port_tty_get(port);
-
- if (tty) {
- tty_wakeup(tty);
- tty_kref_put(tty);
- }
+ port->client_ops->write_wakeup(port);
}
EXPORT_SYMBOL_GPL(tty_port_tty_wakeup);