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Date: Mon, 19 Nov 2007 15:20:31 +0000
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] keyspan_pda: Clean up speed handling
Signed-off-by: Alan Cox <alan@...hat.com>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.24-rc2-mm1/drivers/usb/serial/keyspan_pda.c linux-2.6.24-rc2-mm1/drivers/usb/serial/keyspan_pda.c
--- linux.vanilla-2.6.24-rc2-mm1/drivers/usb/serial/keyspan_pda.c 2007-11-16 17:20:48.000000000 +0000
+++ linux-2.6.24-rc2-mm1/drivers/usb/serial/keyspan_pda.c 2007-11-16 18:37:19.000000000 +0000
@@ -303,7 +303,7 @@
}
-static int keyspan_pda_setbaud (struct usb_serial *serial, int baud)
+static speed_t keyspan_pda_setbaud (struct usb_serial *serial, speed_t baud)
{
int rc;
int bindex;
@@ -319,7 +319,9 @@
case 38400: bindex = 7; break;
case 57600: bindex = 8; break;
case 115200: bindex = 9; break;
- default: return -EINVAL;
+ default:
+ bindex = 5; /* Default to 9600 */
+ baud = 9600;
}
/* rather than figure out how to sleep while waiting for this
@@ -334,7 +336,9 @@
NULL, /* &data */
0, /* size */
2000); /* timeout */
- return(rc);
+ if (rc < 0)
+ return 0;
+ return baud;
}
@@ -366,7 +370,7 @@
struct ktermios *old_termios)
{
struct usb_serial *serial = port->serial;
- unsigned int cflag = port->tty->termios->c_cflag;
+ speed_t speed;
/* cflag specifies lots of stuff: number of stop bits, parity, number
of data bits, baud. What can the device actually handle?:
@@ -388,22 +392,18 @@
For now, just do baud. */
- switch (cflag & CBAUD) {
- /* we could support more values here, just need to calculate
- the necessary divisors in the firmware. <asm/termbits.h>
- has the Bnnn constants. */
- case B110: keyspan_pda_setbaud(serial, 110); break;
- case B300: keyspan_pda_setbaud(serial, 300); break;
- case B1200: keyspan_pda_setbaud(serial, 1200); break;
- case B2400: keyspan_pda_setbaud(serial, 2400); break;
- case B4800: keyspan_pda_setbaud(serial, 4800); break;
- case B9600: keyspan_pda_setbaud(serial, 9600); break;
- case B19200: keyspan_pda_setbaud(serial, 19200); break;
- case B38400: keyspan_pda_setbaud(serial, 38400); break;
- case B57600: keyspan_pda_setbaud(serial, 57600); break;
- case B115200: keyspan_pda_setbaud(serial, 115200); break;
- default: dbg("can't handle requested baud rate"); break;
- }
+ speed = tty_get_baud_rate(port->tty);
+ speed = keyspan_pda_setbaud(serial, speed);
+
+ if (speed == 0) {
+ dbg("can't handle requested baud rate");
+ /* It hasn't changed so.. */
+ speed = tty_termios_baud_rate(old_termios);
+ }
+ /* Only speed can change so copy the old h/w parameters
+ then encode the new speed */
+ tty_termios_copy_hw(port->tty->termios, old_termios);
+ tty_encode_baud_rate(port->tty, speed, speed);
}
-
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