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Date:   Mon, 29 Aug 2022 15:00:49 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Michal Michalik <michal.michalik@...el.com>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        richardcochran@...il.com, Gurucharan <gurucharanx.g@...el.com>
Subject: [PATCH net 3/3] ice: Add set_termios tty operations handle to GNSS

From: Michal Michalik <michal.michalik@...el.com>

Some third party tools (ex. ubxtool) try to change GNSS TTY parameters
(ex. speed). While being optional implementation, without set_termios
handle this operation fails and prevents those third party tools from
working. TTY interface in ice driver is virtual and doesn't need any change
on set_termios, so is left empty. Add this mock to support all Linux TTY
APIs.

Fixes: 43113ff73453 ("ice: add TTY for GNSS module for E810T device")
Signed-off-by: Michal Michalik <michal.michalik@...el.com>
Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_gnss.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index b5a7f246d230..c2dc5e5c8fa4 100644
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -404,11 +404,26 @@ static unsigned int ice_gnss_tty_write_room(struct tty_struct *tty)
 	return ICE_GNSS_TTY_WRITE_BUF;
 }
 
+/**
+ * ice_gnss_tty_set_termios - mock for set_termios tty operations
+ * @tty: pointer to the tty_struct
+ * @new_termios: pointer to the new termios parameters
+ */
+static void
+ice_gnss_tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
+{
+	/* Some 3rd party tools (ex. ubxtool) want to change the TTY parameters.
+	 * In our virtual interface (I2C communication over FW AQ) we don't have
+	 * to change anything, but we need to implement it to unblock tools.
+	 */
+}
+
 static const struct tty_operations tty_gps_ops = {
 	.open =		ice_gnss_tty_open,
 	.close =	ice_gnss_tty_close,
 	.write =	ice_gnss_tty_write,
 	.write_room =	ice_gnss_tty_write_room,
+	.set_termios =  ice_gnss_tty_set_termios,
 };
 
 /**
-- 
2.35.1

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