Add handler to support TTY chars_in_buffer operation
Signed-off-by: Jagannathan Raman <jag.raman@xxxxxxxxxx>
Reviewed-by: Liam Merwick <liam.merwick@xxxxxxxxxx>
Reviewed-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
---
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 0c0fe22..070c541 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)
--
1.7.1
--
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