linux-kernel - [PATCH 10/24] USB: serial: pl2303: fix TIOCGSERIAL implementation

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Date:   Wed,  7 Apr 2021 12:39:11 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/24] USB: serial: pl2303: fix TIOCGSERIAL implementation

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 baud_base parameter 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. The driver does not yet support changing
these, but let's report back the default values actually used (0.5 and
30 seconds, respectively).

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/pl2303.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index eed9acd1ae08..0455add8593a 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -946,8 +946,9 @@ static int pl2303_get_serial(struct tty_struct *tty,

 	ss->type = PORT_16654;
 	ss->line = port->minor;
-	ss->port = port->port_number;
-	ss->baud_base = 460800;
+	ss->close_delay = 50;
+	ss->closing_wait = 3000;
+
 	return 0;
 }

-- 
2.26.3