diff options
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 30 | ||||
| -rw-r--r-- | drivers/tty/tty_ioctl.c | 45 | ||||
| -rw-r--r-- | include/linux/tty.h | 3 |
3 files changed, 51 insertions, 27 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 642e24d6c475..69092deba11f 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -334,39 +334,15 @@ void 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); diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index 75885d502749..507a25d692bb 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -280,6 +280,51 @@ int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b) 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 diff --git a/include/linux/tty.h b/include/linux/tty.h index 4c0c7ca1d9a4..19dc1097e09c 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -495,6 +495,9 @@ static inline speed_t tty_get_baud_rate(struct tty_struct *tty) 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); |