uart_update_timeout(struct uart_port *port, unsigned int cflag,
unsigned int baud)
{
- unsigned int bits;
+ unsigned int size;
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5:
- bits = 7;
- break;
- case CS6:
- bits = 8;
- break;
- case CS7:
- bits = 9;
- break;
- default:
- bits = 10;
- break; /* CS8 */
- }
-
- if (cflag & CSTOPB)
- bits++;
- if (cflag & PARENB)
- bits++;
-
- /*
- * The total number of bits to be transmitted in the fifo.
- */
- bits = bits * port->fifosize;
+ size = tty_get_frame_size(cflag) * port->fifosize;
/*
* Figure the timeout to send the above number of bits.
* Add .02 seconds of slop
*/
- port->timeout = (HZ * bits) / baud + HZ/50;
+ port->timeout = (HZ * size) / baud + HZ/50;
}
EXPORT_SYMBOL(uart_update_timeout);
EXPORT_SYMBOL(tty_termios_hw_change);
/**
+ * tty_get_char_size - get size of a character
+ * @cflag: termios cflag value
+ *
+ * Get the size (in bits) of a character depending on @cflag's %CSIZE
+ * setting.
+ */
+unsigned char tty_get_char_size(unsigned int cflag)
+{
+ switch (cflag & CSIZE) {
+ case CS5:
+ return 5;
+ case CS6:
+ return 6;
+ case CS7:
+ return 7;
+ case CS8:
+ default:
+ return 8;
+ }
+}
+EXPORT_SYMBOL_GPL(tty_get_char_size);
+
+/**
+ * tty_get_frame_size - get size of a frame
+ * @cflag: termios cflag value
+ *
+ * Get the size (in bits) of a frame depending on @cflag's %CSIZE, %CSTOPB,
+ * and %PARENB setting. The result is a sum of character size, start and
+ * stop bits -- one bit each -- second stop bit (if set), and parity bit
+ * (if set).
+ */
+unsigned char tty_get_frame_size(unsigned int cflag)
+{
+ unsigned char bits = 2 + tty_get_char_size(cflag);
+
+ if (cflag & CSTOPB)
+ bits++;
+ if (cflag & PARENB)
+ bits++;
+
+ return bits;
+}
+EXPORT_SYMBOL_GPL(tty_get_frame_size);
+
+/**
* tty_set_termios - update termios values
* @tty: tty to update
* @new_termios: desired new value
return tty_termios_baud_rate(&tty->termios);
}
+unsigned char tty_get_char_size(unsigned int cflag);
+unsigned char tty_get_frame_size(unsigned int cflag);
+
extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);