cp210x.c (be125d9c8d59560e7cc2d6e2b65c8fd233498ab7) cp210x.c (e5990874e511d5bbca23b3396419480cb2ca0ee7)
1/*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.

--- 25 unchanged lines hidden (view full) ---

34 * Function Prototypes
35 */
36static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
37static void cp210x_close(struct usb_serial_port *);
38static void cp210x_get_termios(struct tty_struct *,
39 struct usb_serial_port *port);
40static void cp210x_get_termios_port(struct usb_serial_port *port,
41 unsigned int *cflagp, unsigned int *baudp);
1/*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.

--- 25 unchanged lines hidden (view full) ---

34 * Function Prototypes
35 */
36static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
37static void cp210x_close(struct usb_serial_port *);
38static void cp210x_get_termios(struct tty_struct *,
39 struct usb_serial_port *port);
40static void cp210x_get_termios_port(struct usb_serial_port *port,
41 unsigned int *cflagp, unsigned int *baudp);
42static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios *);
42static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios*);
44static int cp210x_tiocmget(struct tty_struct *);
45static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
46static int cp210x_tiocmset_port(struct usb_serial_port *port,
47 unsigned int, unsigned int);
48static void cp210x_break_ctl(struct tty_struct *, int);
49static int cp210x_startup(struct usb_serial *);

--- 521 unchanged lines hidden (view full) ---

571 } else {
572 dbg("%s - flow control = NONE", __func__);
573 cflag &= ~CRTSCTS;
574 }
575
576 *cflagp = cflag;
577}
578
44static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
45 struct ktermios*);
46static int cp210x_tiocmget(struct tty_struct *);
47static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
48static int cp210x_tiocmset_port(struct usb_serial_port *port,
49 unsigned int, unsigned int);
50static void cp210x_break_ctl(struct tty_struct *, int);
51static int cp210x_startup(struct usb_serial *);

--- 521 unchanged lines hidden (view full) ---

573 } else {
574 dbg("%s - flow control = NONE", __func__);
575 cflag &= ~CRTSCTS;
576 }
577
578 *cflagp = cflag;
579}
580
581/*
582 * CP2101 supports the following baud rates:
583 *
584 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
585 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
586 *
587 * CP2102 and CP2103 support the following additional rates:
588 *
589 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
590 * 576000
591 *
592 * The device will map a requested rate to a supported one, but the result
593 * of requests for rates greater than 1053257 is undefined (see AN205).
594 *
595 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
596 * respectively, with an error less than 1%. The actual rates are determined
597 * by
598 *
599 * div = round(freq / (2 x prescale x request))
600 * actual = freq / (2 x prescale x div)
601 *
602 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
603 * or 1 otherwise.
604 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
605 * otherwise.
606 */
607static void cp210x_change_speed(struct tty_struct *tty,
608 struct usb_serial_port *port, struct ktermios *old_termios)
609{
610 u32 baud;
611
612 baud = tty->termios->c_ospeed;
613
614 /* This maps the requested rate to a rate valid on cp2102 or cp2103.
615 *
616 * NOTE: B0 is not implemented.
617 */
618 baud = cp210x_quantise_baudrate(baud);
619
620 dbg("%s - setting baud rate to %u", __func__, baud);
621 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
622 sizeof(baud))) {
623 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
624 if (old_termios)
625 baud = old_termios->c_ospeed;
626 else
627 baud = 9600;
628 }
629
630 tty_encode_baud_rate(tty, baud, baud);
631}
632
579static void cp210x_set_termios(struct tty_struct *tty,
580 struct usb_serial_port *port, struct ktermios *old_termios)
581{
582 unsigned int cflag, old_cflag;
633static void cp210x_set_termios(struct tty_struct *tty,
634 struct usb_serial_port *port, struct ktermios *old_termios)
635{
636 unsigned int cflag, old_cflag;
583 u32 baud;
584 unsigned int bits;
585 unsigned int modem_ctl[4];
586
587 dbg("%s - port %d", __func__, port->number);
588
589 if (!tty)
590 return;
591
592 cflag = tty->termios->c_cflag;
593 old_cflag = old_termios->c_cflag;
637 unsigned int bits;
638 unsigned int modem_ctl[4];
639
640 dbg("%s - port %d", __func__, port->number);
641
642 if (!tty)
643 return;
644
645 cflag = tty->termios->c_cflag;
646 old_cflag = old_termios->c_cflag;
594 baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
595
647
596 /* If the baud rate is to be updated*/
597 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
598 dbg("%s - Setting baud rate to %d baud", __func__,
599 baud);
600 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, sizeof(baud))) {
601 dbg("Baud rate requested not supported by device");
602 baud = tty_termios_baud_rate(old_termios);
603 }
604 }
605 /* Report back the resulting baud rate */
606 tty_encode_baud_rate(tty, baud, baud);
648 if (tty->termios->c_ospeed != old_termios->c_ospeed)
649 cp210x_change_speed(tty, port, old_termios);
607
608 /* If the number of data bits is to be updated */
609 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
610 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
611 bits &= ~BITS_DATA_MASK;
612 switch (cflag & CSIZE) {
613 case CS5:
614 bits |= BITS_DATA_5;

--- 223 unchanged lines hidden --- 		650
651 /* If the number of data bits is to be updated */
652 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
653 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
654 bits &= ~BITS_DATA_MASK;
655 switch (cflag & CSIZE) {
656 case CS5:
657 bits |= BITS_DATA_5;

--- 223 unchanged lines hidden ---