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sparc64: vcc: Add chars_in_buffer TTY operation

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Add handler to support TTY chars_in_buffer operation

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-08-15 17:03:07 -04:00 committed by David S. Miller
parent cf0452600b
commit aeee7debf3
1 changed files with 29 additions and 5 deletions
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34
drivers/tty/vcc.c
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@ -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)