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usb-serial: begin switching to ->[sg]et_serial()

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add such methods for usb_serial_driver, provide tty_operations
->[sg]et_serial() calling those.  For now the lack of methods
in driver means ENOIOCTLCMD from usb-serial ->[sg]et_serial(),
making tty_ioctl() fall back to calling ->ioctl().  Once all
drivers are converted, we'll be returning -ENOTTY instead,
completing the switchover.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-09-11 23:28:07 -04:00
parent 6a9daed31c
commit 81732b26e0
2 changed files with 22 additions and 0 deletions
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20
drivers/usb/serial/usb-serial.c
View File

@ -396,6 +396,24 @@ static void serial_unthrottle(struct tty_struct *tty)
port->serial->type->unthrottle(tty);
}
static int serial_get_serial(struct tty_struct *tty, struct serial_struct *ss)
{
struct usb_serial_port *port = tty->driver_data;
if (port->serial->type->get_serial)
return port->serial->type->get_serial(tty, ss);
return -ENOIOCTLCMD;
}
static int serial_set_serial(struct tty_struct *tty, struct serial_struct *ss)
{
struct usb_serial_port *port = tty->driver_data;
if (port->serial->type->set_serial)
return port->serial->type->set_serial(tty, ss);
return -ENOIOCTLCMD;
}
static int serial_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -1177,6 +1195,8 @@ static const struct tty_operations serial_ops = {
.tiocmget = serial_tiocmget,
.tiocmset = serial_tiocmset,
.get_icount = serial_get_icount,
.set_serial = serial_set_serial,
.get_serial = serial_get_serial,
.cleanup = serial_cleanup,
.install = serial_install,
.proc_show = serial_proc_show,

2
include/linux/usb/serial.h
View File

@ -285,6 +285,8 @@ struct usb_serial_driver {
int (*write_room)(struct tty_struct *tty);
int (*ioctl)(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
int (*get_serial)(struct tty_struct *tty, struct serial_struct *ss);
int (*set_serial)(struct tty_struct *tty, struct serial_struct *ss);
void (*set_termios)(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
void (*break_ctl)(struct tty_struct *tty, int break_state);