diff mbox series

[08/24] USB: serial: mos7840: fix TIOCGSERIAL implementation

Message ID 20210407103925.829-9-johan@kernel.org (mailing list archive)
State Accepted
Commit a804834bdf5e6be93fa7a0557e9bb80fd6d92664
Headers show
Series USB: serial: TIOCSSERIAL fixes and generic support | expand

Commit Message

Johan Hovold April 7, 2021, 10:39 a.m. UTC
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.

The port parameter is used to set the I/O port and does not make any
sense to use for USB serial devices.

The xmit_fifo_size parameter could be used to set the hardware transmit
fifo size of a legacy UART when it could not be detected, but the
interface is limited to eight bits and should be left unset when not
used.

Similarly, baud_base could be used to set the UART base clock when it
could not be detected but might as well be left unset when it is not
known.

The close_delay and closing_wait parameters returned by TIOCGSERIAL are
specified in centiseconds (not jiffies). The driver does not yet support
changing these, but let's report back the default values actually used
(0.5 and 30 seconds, respectively).

Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/mos7840.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 1bf0d066f55a..77cbe18a1629 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1392,16 +1392,12 @@  static int mos7840_get_serial_info(struct tty_struct *tty,
 				   struct serial_struct *ss)
 {
 	struct usb_serial_port *port = tty->driver_data;
-	struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 
 	ss->type = PORT_16550A;
-	ss->line = mos7840_port->port->minor;
-	ss->port = mos7840_port->port->port_number;
-	ss->irq = 0;
-	ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
-	ss->baud_base = 9600;
-	ss->close_delay = 5 * HZ;
-	ss->closing_wait = 30 * HZ;
+	ss->line = port->minor;
+	ss->close_delay = 50;
+	ss->closing_wait = 3000;
+
 	return 0;
 }