diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vcc.c | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c index 0c0fe228546b..070c54188971 100644 --- a/drivers/tty/vcc.c +++ b/drivers/tty/vcc.c @@ -937,12 +937,36 @@ static int vcc_write_room(struct tty_struct *tty) return num; } +static int vcc_chars_in_buffer(struct tty_struct *tty) +{ + struct vcc_port *port; + u64 num; + + if (unlikely(!tty)) { + pr_err("VCC: chars_in_buffer: Invalid TTY handle\n"); + return -ENXIO; + } + + port = vcc_get_ne(tty->index); + if (unlikely(!port)) { + pr_err("VCC: chars_in_buffer: Failed to find VCC port\n"); + return -ENODEV; + } + + num = port->chars_in_buffer; + + vcc_put(port, false); + + return num; +} + static const struct tty_operations vcc_ops = { - .open = vcc_open, - .close = vcc_close, - .hangup = vcc_hangup, - .write = vcc_write, - .write_room = vcc_write_room, + .open = vcc_open, + .close = vcc_close, + .hangup = vcc_hangup, + .write = vcc_write, + .write_room = vcc_write_room, + .chars_in_buffer = vcc_chars_in_buffer, }; #define VCC_TTY_FLAGS (TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_REAL_RAW) |