USB: serial: make use of UART_LCR_WLEN() + tty_get_char_size()

Having a generic UART_LCR_WLEN() macro and the tty_get_char_size()
helper, we can remove all those repeated switch-cases in drivers.

Cc: Johan Hovold <johan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220224095558.30929-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Jiri Slaby

drivers/usb/serial/ark3116.c

@@ -200,21 +200,8 @@ static void ark3116_set_termios(struct tty_struct *tty,
 	__u8 lcr, hcr, eval;
 
 	/* set data bit count */
-	switch (cflag & CSIZE) {
-	case CS5:
-		lcr = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		lcr = UART_LCR_WLEN8;
-		break;
-	}
+	lcr = UART_LCR_WLEN(tty_get_char_size(cflag));
+
 	if (cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
 	if (cflag & PARENB)

drivers/usb/serial/f81232.c

@@ -643,21 +643,7 @@ static void f81232_set_termios(struct tty_struct *tty,
 	if (C_CSTOPB(tty))
 		new_lcr |= UART_LCR_STOP;
 
-	switch (C_CSIZE(tty)) {
-	case CS5:
-		new_lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		new_lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		new_lcr |= UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		new_lcr |= UART_LCR_WLEN8;
-		break;
-	}
+	new_lcr |= UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
 
 	mutex_lock(&priv->lock);
 

drivers/usb/serial/f81534.c

@@ -970,21 +970,7 @@ static void f81534_set_termios(struct tty_struct *tty,
 	if (C_CSTOPB(tty))
 		new_lcr |= UART_LCR_STOP;
 
-	switch (C_CSIZE(tty)) {
-	case CS5:
-		new_lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		new_lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		new_lcr |= UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		new_lcr |= UART_LCR_WLEN8;
-		break;
-	}
+	new_lcr |= UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
 
 	baud = tty_get_baud_rate(tty);
 	if (!baud)

drivers/usb/serial/mos7720.c

@@ -1380,30 +1380,12 @@ static void change_port_settings(struct tty_struct *tty,
 		return;
 	}
 
-	lData = UART_LCR_WLEN8;
 	lStop = 0x00;	/* 1 stop bit */
 	lParity = 0x00;	/* No parity */
 
 	cflag = tty->termios.c_cflag;
 
-	/* Change the number of bits */
-	switch (cflag & CSIZE) {
-	case CS5:
-		lData = UART_LCR_WLEN5;
-		break;
-
-	case CS6:
-		lData = UART_LCR_WLEN6;
-		break;
-
-	case CS7:
-		lData = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		lData = UART_LCR_WLEN8;
-		break;
-	}
+	lData = UART_LCR_WLEN(tty_get_char_size(cflag));
 
 	/* Change the Parity bit */
 	if (cflag & PARENB) {

drivers/usb/serial/quatech2.c

@@ -281,21 +281,7 @@ static void qt2_set_termios(struct tty_struct *tty,
 			new_lcr |= SERIAL_EVEN_PARITY;
 	}
 
-	switch (cflag & CSIZE) {
-	case CS5:
-		new_lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		new_lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		new_lcr |= UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		new_lcr |= UART_LCR_WLEN8;
-		break;
-	}
+	new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag));
 
 	baud = tty_get_baud_rate(tty);
 	if (!baud)

drivers/usb/serial/ssu100.c

@@ -231,21 +231,7 @@ static void ssu100_set_termios(struct tty_struct *tty,
 			urb_value |= SERIAL_EVEN_PARITY;
 	}
 
-	switch (cflag & CSIZE) {
-	case CS5:
-		urb_value |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		urb_value |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		urb_value |= UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		urb_value |= UART_LCR_WLEN8;
-		break;
-	}
+	urb_value |= UART_LCR_WLEN(tty_get_char_size(cflag));
 
 	baud = tty_get_baud_rate(tty);
 	if (!baud)