linux-kernel - [PATCH 4/6] tty: n_gsm: introduce gsm_control

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Date:   Mon, 22 Aug 2022 09:21:36 +0200
From:   "D. Starke" <daniel.starke@...mens.com>
To:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Daniel Starke <daniel.starke@...mens.com>
Subject: [PATCH 4/6] tty: n_gsm: introduce gsm_control_command() function

From: Daniel Starke <daniel.starke@...mens.com>

Move the content of gsm_control_transmit() to a new function
gsm_control_command() with a more generic signature and analog to
gsm_control_reply(). Use this within gsm_control_transmit().

This is needed to simplify upcoming functional additions.

Signed-off-by: Daniel Starke <daniel.starke@...mens.com>
---
 drivers/tty/n_gsm.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index c87525b70e81..71599198eb6d 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1316,6 +1316,28 @@ static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
  */
 
 
+/**
+ *	gsm_control_command	-	send a command frame to a control
+ *	@gsm: gsm channel
+ *	@cmd: the command to use
+ *	@data: data to follow encoded info
+ *	@dlen: length of data
+ *
+ *	Encode up and queue a UI/UIH frame containing our command.
+ */
+static int gsm_control_command(struct gsm_mux *gsm, int cmd, u8 *data, int dlen)
+{
+	struct gsm_msg *msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype);
+
+	if (msg == NULL)
+		return -ENOMEM;
+	msg->data[0] = (cmd << 1) | CR | EA;	/* Set C/R */
+	msg->data[1] = (dlen << 1) | EA;
+	memcpy(msg->data + 2, data, dlen);
+	gsm_data_queue(gsm->dlci[0], msg);
+	return 0;
+}
+
 /**
  *	gsm_control_reply	-	send a response frame to a control
  *	@gsm: gsm channel
@@ -1623,13 +1645,7 @@ static void gsm_control_response(struct gsm_mux *gsm, unsigned int command,
 
 static void gsm_control_transmit(struct gsm_mux *gsm, struct gsm_control *ctrl)
 {
-	struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 2, gsm->ftype);
-	if (msg == NULL)
-		return;
-	msg->data[0] = (ctrl->cmd << 1) | CR | EA;	/* command */
-	msg->data[1] = (ctrl->len << 1) | EA;
-	memcpy(msg->data + 2, ctrl->data, ctrl->len);
-	gsm_data_queue(gsm->dlci[0], msg);
+	gsm_control_command(gsm, ctrl->cmd, ctrl->data, ctrl->len);
 }
 
 /**
-- 
2.34.1