linux-kernel - [PATCH 07/12] USB: serial: ftdi_sio: clean up modem-status handling

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Date:   Sun, 11 Sep 2022 16:02:11 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Amireddy mallikarjuna reddy <mallikarjuna.reddy@...ichip.com>,
        arun.pappan@...ichip.com, sowjanya.reddy@...ichip.com,
        malliamireddy009@...il.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/12] USB: serial: ftdi_sio: clean up modem-status handling

All chip types but the original SIO (FT8U100AX) return a two-byte modem
status and there's no need to explicitly list every other type in the
handler.

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/ftdi_sio.c | 22 ++++------------------
 1 file changed, 4 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index f372f55a1bdf..58e0acb211df 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2821,27 +2821,13 @@ static int ftdi_get_modem_status(struct usb_serial_port *port,
 	if (!buf)
 		return -ENOMEM;
 	/*
-	 * The 8U232AM returns a two byte value (the SIO a 1 byte value) in
-	 * the same format as the data returned from the in point.
+	 * The device returns a two byte value (the SIO a 1 byte value) in the
+	 * same format as the data returned from the IN endpoint.
 	 */
-	switch (priv->chip_type) {
-	case SIO:
+	if (priv->chip_type == SIO)
 		len = 1;
-		break;
-	case FT232A:
-	case FT232B:
-	case FT2232C:
-	case FT232R:
-	case FT2232H:
-	case FT4232H:
-	case FT232H:
-	case FTX:
+	else
 		len = 2;
-		break;
-	default:
-		ret = -EFAULT;
-		goto out;
-	}
 
 	ret = usb_control_msg(port->serial->dev,
 			usb_rcvctrlpipe(port->serial->dev, 0),
-- 
2.35.1