Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e917ba01 authored by Frank Schäfer's avatar Frank Schäfer Committed by Greg Kroah-Hartman
Browse files

usb: pl2303: move the two baud rate encoding methods to separate functions 



Signed-off-by: default avatarFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b9208c72

drivers/usb/serial/pl2303.c

+114 −101
Original line number Diff line number Diff line
@@ -269,30 +269,18 @@ static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 
	return retval;

}



static void pl2303_encode_baudrate(struct tty_struct *tty,

					struct usb_serial_port *port,

static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,

								      u8 buf[4])

{

	struct usb_serial *serial = port->serial;

	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);

	int baud;



	baud = tty_get_baud_rate(tty);

	dev_dbg(&port->dev, "baud requested = %d\n", baud);

	if (!baud)

		return;



	if (spriv->type != HX || baud <= 115200) {

	/*

	 * NOTE: Only the values defined in baud_sup are supported !

	 *       => if unsupported values are set, the PL2303 seems to

	 *	    use 9600 baud (at least my PL2303X always does)

	 */

		const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400,

					 3600, 4800, 7200, 9600, 14400, 19200,

					 28800, 38400, 57600, 115200, 230400,

					 460800, 614400, 921600, 1228800,

					 2457600, 3000000, 6000000 };

	const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,

				 4800, 7200, 9600, 14400, 19200, 28800, 38400,

				 57600, 115200, 230400, 460800, 614400, 921600,

				 1228800, 2457600, 3000000, 6000000 };

	int i;



	/* Set baudrate to nearest supported value */
@@ -300,27 +288,28 @@ static void pl2303_encode_baudrate(struct tty_struct *tty, 
		if (baud_sup[i] > baud)

			break;

	}



	if (i == ARRAY_SIZE(baud_sup))

		baud = baud_sup[i - 1];

		else if (i > 0

			     && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))

	else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))

		baud = baud_sup[i - 1];

	else

		baud = baud_sup[i];



	/* type_0, type_1 only support up to 1228800 baud */

		if (spriv->type != HX)

	if (type != HX)

		baud = min_t(int, baud, 1228800);



	/* Direct (standard) baud rate encoding method */

	put_unaligned_le32(baud, buf);

	} else {



	return baud;

}



static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type,

								      u8 buf[4])

{

	/*

	 * Divisor based baud rate encoding method

	 *

		 * NOTE: it's not clear if the type_0/1 chips

		 * support this method

	 * NOTE: it's not clear if the type_0/1 chips support this method

	 *

	 * divisor = 12MHz * 32 / baudrate = 2^A * B

	 *
@@ -337,7 +326,7 @@ static void pl2303_encode_baudrate(struct tty_struct *tty, 


	/* Respect the specified baud rate limits */

	baud = max_t(int, baud, 75);

		if (spriv->type == HX)

	if (type == HX)

		baud = min_t(int, baud, 6000000);

	else

		baud = min_t(int, baud, 1228800);
@@ -376,8 +365,32 @@ static void pl2303_encode_baudrate(struct tty_struct *tty, 
	if (B <= 8)

		B = 512;

	baud = 12000000 * 32 / ((1 << A) * B);



	return baud;

}



static void pl2303_encode_baudrate(struct tty_struct *tty,

					struct usb_serial_port *port,

					enum pl2303_type type,

					u8 buf[4])

{

	int baud;



	baud = tty_get_baud_rate(tty);

	dev_dbg(&port->dev, "baud requested = %d\n", baud);

	if (!baud)

		return;

	/*

	 * There are two methods for setting/encoding the baud rate

	 * 1) Direct method: encodes the baud rate value directly

	 *    => supported by all chip types

	 * 2) Divisor based method: encodes a divisor to a base value (12MHz*32)

	 *    => supported by HX chips (and likely not by type_0/1 chips)

	 */

	if (type != HX || baud <= 115200)

		baud = pl2303_baudrate_encode_direct(baud, type, buf);

	else

		baud = pl2303_baudrate_encode_divisor(baud, type, buf);

	/* Save resulting baud rate */

	tty_encode_baud_rate(tty, baud, baud);

	dev_dbg(&port->dev, "baud set = %d\n", baud);
@@ -434,8 +447,8 @@ static void pl2303_set_termios(struct tty_struct *tty, 
		dev_dbg(&port->dev, "data bits = %d\n", buf[6]);

	}



	/* For reference buf[0]:buf[3] baud rate value */

	pl2303_encode_baudrate(tty, port, &buf[0]);

	/* For reference:   buf[0]:buf[3] baud rate value */

	pl2303_encode_baudrate(tty, port, spriv->type, buf);



	/* For reference buf[4]=0 is 1 stop bits */

	/* For reference buf[4]=1 is 1.5 stop bits */