forked from Minki/linux
35807187e4
The device uses the second interrupt-in endpoint of the interface for reading. Stop abusing the port read urb and store a pointer to the second interrupt-in urb as port-private data instead. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
773 lines
22 KiB
C
773 lines
22 KiB
C
/*
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* MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
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*
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* Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is largely derived from the Belkin USB Serial Adapter Driver
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* (see belkin_sa.[ch]). All of the information about the device was acquired
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* by using SniffUSB on Windows98. For technical details see mct_u232.h.
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*
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* William G. Greathouse and Greg Kroah-Hartman provided great help on how to
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* do the reverse engineering and how to write a USB serial device driver.
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*
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* TO BE DONE, TO BE CHECKED:
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* DTR/RTS signal handling may be incomplete or incorrect. I have mainly
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* implemented what I have seen with SniffUSB or found in belkin_sa.c.
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* For further TODOs check also belkin_sa.c.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/serial.h>
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#include "mct_u232.h"
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#define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
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#define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
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/*
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* Function prototypes
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*/
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static int mct_u232_port_probe(struct usb_serial_port *port);
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static int mct_u232_port_remove(struct usb_serial_port *remove);
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static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
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static void mct_u232_close(struct usb_serial_port *port);
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static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
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static void mct_u232_read_int_callback(struct urb *urb);
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static void mct_u232_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old);
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static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
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static int mct_u232_tiocmget(struct tty_struct *tty);
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static int mct_u232_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear);
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static void mct_u232_throttle(struct tty_struct *tty);
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static void mct_u232_unthrottle(struct tty_struct *tty);
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/*
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* All of the device info needed for the MCT USB-RS232 converter.
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*/
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
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{ USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
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{ USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
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{ USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_serial_driver mct_u232_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "mct_u232",
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},
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.description = "MCT U232",
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.id_table = id_table,
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.num_ports = 1,
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.open = mct_u232_open,
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.close = mct_u232_close,
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.dtr_rts = mct_u232_dtr_rts,
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.throttle = mct_u232_throttle,
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.unthrottle = mct_u232_unthrottle,
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.read_int_callback = mct_u232_read_int_callback,
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.set_termios = mct_u232_set_termios,
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.break_ctl = mct_u232_break_ctl,
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.tiocmget = mct_u232_tiocmget,
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.tiocmset = mct_u232_tiocmset,
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.tiocmiwait = usb_serial_generic_tiocmiwait,
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.port_probe = mct_u232_port_probe,
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.port_remove = mct_u232_port_remove,
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.get_icount = usb_serial_generic_get_icount,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&mct_u232_device, NULL
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};
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struct mct_u232_private {
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struct urb *read_urb;
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spinlock_t lock;
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unsigned int control_state; /* Modem Line Setting (TIOCM) */
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unsigned char last_lcr; /* Line Control Register */
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unsigned char last_lsr; /* Line Status Register */
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unsigned char last_msr; /* Modem Status Register */
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unsigned int rx_flags; /* Throttling flags */
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};
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#define THROTTLED 0x01
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/*
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* Handle vendor specific USB requests
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*/
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#define WDR_TIMEOUT 5000 /* default urb timeout */
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/*
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* Later day 2.6.0-test kernels have new baud rates like B230400 which
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* we do not know how to support. We ignore them for the moment.
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*/
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static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
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speed_t value, speed_t *result)
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{
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*result = value;
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if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
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|| le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
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switch (value) {
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case 300:
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return 0x01;
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case 600:
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return 0x02; /* this one not tested */
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case 1200:
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return 0x03;
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case 2400:
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return 0x04;
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case 4800:
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return 0x06;
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case 9600:
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return 0x08;
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case 19200:
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return 0x09;
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case 38400:
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return 0x0a;
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case 57600:
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return 0x0b;
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case 115200:
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return 0x0c;
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default:
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*result = 9600;
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return 0x08;
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}
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} else {
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/* FIXME: Can we use any divider - should we do
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divider = 115200/value;
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real baud = 115200/divider */
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switch (value) {
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case 300: break;
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case 600: break;
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case 1200: break;
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case 2400: break;
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case 4800: break;
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case 9600: break;
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case 19200: break;
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case 38400: break;
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case 57600: break;
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case 115200: break;
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default:
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value = 9600;
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*result = 9600;
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}
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return 115200/value;
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}
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}
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static int mct_u232_set_baud_rate(struct tty_struct *tty,
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struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
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{
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unsigned int divisor;
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int rc;
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unsigned char *buf;
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unsigned char cts_enable_byte = 0;
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speed_t speed;
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buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
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put_unaligned_le32(cpu_to_le32(divisor), buf);
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rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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MCT_U232_SET_BAUD_RATE_REQUEST,
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MCT_U232_SET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
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WDR_TIMEOUT);
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if (rc < 0) /*FIXME: What value speed results */
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dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
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value, rc);
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else
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tty_encode_baud_rate(tty, speed, speed);
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dev_dbg(&port->dev, "set_baud_rate: value: 0x%x, divisor: 0x%x\n", value, divisor);
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/* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
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always sends two extra USB 'device request' messages after the
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'baud rate change' message. The actual functionality of the
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request codes in these messages is not fully understood but these
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particular codes are never seen in any operation besides a baud
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rate change. Both of these messages send a single byte of data.
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In the first message, the value of this byte is always zero.
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The second message has been determined experimentally to control
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whether data will be transmitted to a device which is not asserting
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the 'CTS' signal. If the second message's data byte is zero, data
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will be transmitted even if 'CTS' is not asserted (i.e. no hardware
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flow control). if the second message's data byte is nonzero (a
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value of 1 is used by this driver), data will not be transmitted to
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a device which is not asserting 'CTS'.
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*/
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buf[0] = 0;
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rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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MCT_U232_SET_UNKNOWN1_REQUEST,
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MCT_U232_SET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
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WDR_TIMEOUT);
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if (rc < 0)
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dev_err(&port->dev, "Sending USB device request code %d "
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"failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
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rc);
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if (port && C_CRTSCTS(tty))
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cts_enable_byte = 1;
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dev_dbg(&port->dev, "set_baud_rate: send second control message, data = %02X\n",
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cts_enable_byte);
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buf[0] = cts_enable_byte;
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rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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MCT_U232_SET_CTS_REQUEST,
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MCT_U232_SET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_SET_CTS_SIZE,
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WDR_TIMEOUT);
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if (rc < 0)
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dev_err(&port->dev, "Sending USB device request code %d "
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"failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
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kfree(buf);
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return rc;
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} /* mct_u232_set_baud_rate */
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static int mct_u232_set_line_ctrl(struct usb_serial_port *port,
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unsigned char lcr)
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{
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int rc;
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unsigned char *buf;
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buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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buf[0] = lcr;
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rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
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MCT_U232_SET_LINE_CTRL_REQUEST,
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MCT_U232_SET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
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WDR_TIMEOUT);
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if (rc < 0)
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dev_err(&port->dev, "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
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dev_dbg(&port->dev, "set_line_ctrl: 0x%x\n", lcr);
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kfree(buf);
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return rc;
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} /* mct_u232_set_line_ctrl */
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static int mct_u232_set_modem_ctrl(struct usb_serial_port *port,
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unsigned int control_state)
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{
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int rc;
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unsigned char mcr;
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unsigned char *buf;
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buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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mcr = MCT_U232_MCR_NONE;
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if (control_state & TIOCM_DTR)
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mcr |= MCT_U232_MCR_DTR;
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if (control_state & TIOCM_RTS)
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mcr |= MCT_U232_MCR_RTS;
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buf[0] = mcr;
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rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
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MCT_U232_SET_MODEM_CTRL_REQUEST,
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MCT_U232_SET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
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WDR_TIMEOUT);
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kfree(buf);
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dev_dbg(&port->dev, "set_modem_ctrl: state=0x%x ==> mcr=0x%x\n", control_state, mcr);
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if (rc < 0) {
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dev_err(&port->dev, "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
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return rc;
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}
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return 0;
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} /* mct_u232_set_modem_ctrl */
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static int mct_u232_get_modem_stat(struct usb_serial_port *port,
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unsigned char *msr)
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{
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int rc;
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unsigned char *buf;
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buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
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if (buf == NULL) {
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*msr = 0;
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return -ENOMEM;
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}
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rc = usb_control_msg(port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
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MCT_U232_GET_MODEM_STAT_REQUEST,
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MCT_U232_GET_REQUEST_TYPE,
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0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
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WDR_TIMEOUT);
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if (rc < 0) {
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dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc);
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*msr = 0;
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} else {
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*msr = buf[0];
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}
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dev_dbg(&port->dev, "get_modem_stat: 0x%x\n", *msr);
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kfree(buf);
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return rc;
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} /* mct_u232_get_modem_stat */
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static void mct_u232_msr_to_icount(struct async_icount *icount,
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unsigned char msr)
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{
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/* Translate Control Line states */
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if (msr & MCT_U232_MSR_DDSR)
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icount->dsr++;
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if (msr & MCT_U232_MSR_DCTS)
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icount->cts++;
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if (msr & MCT_U232_MSR_DRI)
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icount->rng++;
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if (msr & MCT_U232_MSR_DCD)
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icount->dcd++;
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} /* mct_u232_msr_to_icount */
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static void mct_u232_msr_to_state(struct usb_serial_port *port,
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unsigned int *control_state, unsigned char msr)
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{
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/* Translate Control Line states */
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if (msr & MCT_U232_MSR_DSR)
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*control_state |= TIOCM_DSR;
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else
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*control_state &= ~TIOCM_DSR;
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if (msr & MCT_U232_MSR_CTS)
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*control_state |= TIOCM_CTS;
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else
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*control_state &= ~TIOCM_CTS;
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if (msr & MCT_U232_MSR_RI)
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*control_state |= TIOCM_RI;
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else
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*control_state &= ~TIOCM_RI;
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if (msr & MCT_U232_MSR_CD)
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*control_state |= TIOCM_CD;
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else
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*control_state &= ~TIOCM_CD;
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dev_dbg(&port->dev, "msr_to_state: msr=0x%x ==> state=0x%x\n", msr, *control_state);
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} /* mct_u232_msr_to_state */
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/*
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* Driver's tty interface functions
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*/
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static int mct_u232_port_probe(struct usb_serial_port *port)
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{
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struct mct_u232_private *priv;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* Use second interrupt-in endpoint for reading. */
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priv->read_urb = port->serial->port[1]->interrupt_in_urb;
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priv->read_urb->context = port;
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spin_lock_init(&priv->lock);
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usb_set_serial_port_data(port, priv);
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return 0;
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}
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static int mct_u232_port_remove(struct usb_serial_port *port)
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{
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struct mct_u232_private *priv;
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priv = usb_get_serial_port_data(port);
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kfree(priv);
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return 0;
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}
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static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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struct mct_u232_private *priv = usb_get_serial_port_data(port);
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int retval = 0;
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unsigned int control_state;
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unsigned long flags;
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unsigned char last_lcr;
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unsigned char last_msr;
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/* Compensate for a hardware bug: although the Sitecom U232-P25
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* device reports a maximum output packet size of 32 bytes,
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* it seems to be able to accept only 16 bytes (and that's what
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* SniffUSB says too...)
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*/
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if (le16_to_cpu(serial->dev->descriptor.idProduct)
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== MCT_U232_SITECOM_PID)
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port->bulk_out_size = 16;
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/* Do a defined restart: the normal serial device seems to
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* always turn on DTR and RTS here, so do the same. I'm not
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* sure if this is really necessary. But it should not harm
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* either.
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*/
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spin_lock_irqsave(&priv->lock, flags);
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if (tty && (tty->termios.c_cflag & CBAUD))
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priv->control_state = TIOCM_DTR | TIOCM_RTS;
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else
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priv->control_state = 0;
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priv->last_lcr = (MCT_U232_DATA_BITS_8 |
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MCT_U232_PARITY_NONE |
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MCT_U232_STOP_BITS_1);
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control_state = priv->control_state;
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last_lcr = priv->last_lcr;
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spin_unlock_irqrestore(&priv->lock, flags);
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mct_u232_set_modem_ctrl(port, control_state);
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mct_u232_set_line_ctrl(port, last_lcr);
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/* Read modem status and update control state */
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mct_u232_get_modem_stat(port, &last_msr);
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spin_lock_irqsave(&priv->lock, flags);
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priv->last_msr = last_msr;
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mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
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spin_unlock_irqrestore(&priv->lock, flags);
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retval = usb_submit_urb(priv->read_urb, GFP_KERNEL);
|
|
if (retval) {
|
|
dev_err(&port->dev,
|
|
"usb_submit_urb(read) failed pipe 0x%x err %d\n",
|
|
port->read_urb->pipe, retval);
|
|
goto error;
|
|
}
|
|
|
|
retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (retval) {
|
|
usb_kill_urb(priv->read_urb);
|
|
dev_err(&port->dev,
|
|
"usb_submit_urb(read int) failed pipe 0x%x err %d",
|
|
port->interrupt_in_urb->pipe, retval);
|
|
goto error;
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
return retval;
|
|
} /* mct_u232_open */
|
|
|
|
static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
unsigned int control_state;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
if (on)
|
|
priv->control_state |= TIOCM_DTR | TIOCM_RTS;
|
|
else
|
|
priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
|
|
control_state = priv->control_state;
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
mct_u232_set_modem_ctrl(port, control_state);
|
|
}
|
|
|
|
static void mct_u232_close(struct usb_serial_port *port)
|
|
{
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
|
|
usb_kill_urb(priv->read_urb);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
|
|
usb_serial_generic_close(port);
|
|
} /* mct_u232_close */
|
|
|
|
|
|
static void mct_u232_read_int_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned char *data = urb->transfer_buffer;
|
|
int retval;
|
|
int status = urb->status;
|
|
unsigned long flags;
|
|
|
|
switch (status) {
|
|
case 0:
|
|
/* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* this urb is terminated, clean up */
|
|
dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
|
|
__func__, status);
|
|
return;
|
|
default:
|
|
dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
|
|
__func__, status);
|
|
goto exit;
|
|
}
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
|
|
|
|
/*
|
|
* Work-a-round: handle the 'usual' bulk-in pipe here
|
|
*/
|
|
if (urb->transfer_buffer_length > 2) {
|
|
if (urb->actual_length) {
|
|
tty_insert_flip_string(&port->port, data,
|
|
urb->actual_length);
|
|
tty_flip_buffer_push(&port->port);
|
|
}
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* The interrupt-in pipe signals exceptional conditions (modem line
|
|
* signal changes and errors). data[0] holds MSR, data[1] holds LSR.
|
|
*/
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->last_msr = data[MCT_U232_MSR_INDEX];
|
|
|
|
/* Record Control Line states */
|
|
mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
|
|
|
|
mct_u232_msr_to_icount(&port->icount, priv->last_msr);
|
|
|
|
#if 0
|
|
/* Not yet handled. See belkin_sa.c for further information */
|
|
/* Now to report any errors */
|
|
priv->last_lsr = data[MCT_U232_LSR_INDEX];
|
|
/*
|
|
* fill in the flip buffer here, but I do not know the relation
|
|
* to the current/next receive buffer or characters. I need
|
|
* to look in to this before committing any code.
|
|
*/
|
|
if (priv->last_lsr & MCT_U232_LSR_ERR) {
|
|
tty = tty_port_tty_get(&port->port);
|
|
/* Overrun Error */
|
|
if (priv->last_lsr & MCT_U232_LSR_OE) {
|
|
}
|
|
/* Parity Error */
|
|
if (priv->last_lsr & MCT_U232_LSR_PE) {
|
|
}
|
|
/* Framing Error */
|
|
if (priv->last_lsr & MCT_U232_LSR_FE) {
|
|
}
|
|
/* Break Indicator */
|
|
if (priv->last_lsr & MCT_U232_LSR_BI) {
|
|
}
|
|
tty_kref_put(tty);
|
|
}
|
|
#endif
|
|
wake_up_interruptible(&port->port.delta_msr_wait);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
exit:
|
|
retval = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (retval)
|
|
dev_err(&port->dev,
|
|
"%s - usb_submit_urb failed with result %d\n",
|
|
__func__, retval);
|
|
} /* mct_u232_read_int_callback */
|
|
|
|
static void mct_u232_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
struct ktermios *termios = &tty->termios;
|
|
unsigned int cflag = termios->c_cflag;
|
|
unsigned int old_cflag = old_termios->c_cflag;
|
|
unsigned long flags;
|
|
unsigned int control_state;
|
|
unsigned char last_lcr;
|
|
|
|
/* get a local copy of the current port settings */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control_state = priv->control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
last_lcr = 0;
|
|
|
|
/*
|
|
* Update baud rate.
|
|
* Do not attempt to cache old rates and skip settings,
|
|
* disconnects screw such tricks up completely.
|
|
* Premature optimization is the root of all evil.
|
|
*/
|
|
|
|
/* reassert DTR and RTS on transition from B0 */
|
|
if ((old_cflag & CBAUD) == B0) {
|
|
dev_dbg(&port->dev, "%s: baud was B0\n", __func__);
|
|
control_state |= TIOCM_DTR | TIOCM_RTS;
|
|
mct_u232_set_modem_ctrl(port, control_state);
|
|
}
|
|
|
|
mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
|
|
|
|
if ((cflag & CBAUD) == B0) {
|
|
dev_dbg(&port->dev, "%s: baud is B0\n", __func__);
|
|
/* Drop RTS and DTR */
|
|
control_state &= ~(TIOCM_DTR | TIOCM_RTS);
|
|
mct_u232_set_modem_ctrl(port, control_state);
|
|
}
|
|
|
|
/*
|
|
* Update line control register (LCR)
|
|
*/
|
|
|
|
/* set the parity */
|
|
if (cflag & PARENB)
|
|
last_lcr |= (cflag & PARODD) ?
|
|
MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
|
|
else
|
|
last_lcr |= MCT_U232_PARITY_NONE;
|
|
|
|
/* set the number of data bits */
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
last_lcr |= MCT_U232_DATA_BITS_5; break;
|
|
case CS6:
|
|
last_lcr |= MCT_U232_DATA_BITS_6; break;
|
|
case CS7:
|
|
last_lcr |= MCT_U232_DATA_BITS_7; break;
|
|
case CS8:
|
|
last_lcr |= MCT_U232_DATA_BITS_8; break;
|
|
default:
|
|
dev_err(&port->dev,
|
|
"CSIZE was not CS5-CS8, using default of 8\n");
|
|
last_lcr |= MCT_U232_DATA_BITS_8;
|
|
break;
|
|
}
|
|
|
|
termios->c_cflag &= ~CMSPAR;
|
|
|
|
/* set the number of stop bits */
|
|
last_lcr |= (cflag & CSTOPB) ?
|
|
MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
|
|
|
|
mct_u232_set_line_ctrl(port, last_lcr);
|
|
|
|
/* save off the modified port settings */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->control_state = control_state;
|
|
priv->last_lcr = last_lcr;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
} /* mct_u232_set_termios */
|
|
|
|
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned char lcr;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
lcr = priv->last_lcr;
|
|
|
|
if (break_state)
|
|
lcr |= MCT_U232_SET_BREAK;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
mct_u232_set_line_ctrl(port, lcr);
|
|
} /* mct_u232_break_ctl */
|
|
|
|
|
|
static int mct_u232_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned int control_state;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control_state = priv->control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return control_state;
|
|
}
|
|
|
|
static int mct_u232_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned int control_state;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control_state = priv->control_state;
|
|
|
|
if (set & TIOCM_RTS)
|
|
control_state |= TIOCM_RTS;
|
|
if (set & TIOCM_DTR)
|
|
control_state |= TIOCM_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
control_state &= ~TIOCM_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
control_state &= ~TIOCM_DTR;
|
|
|
|
priv->control_state = control_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
return mct_u232_set_modem_ctrl(port, control_state);
|
|
}
|
|
|
|
static void mct_u232_throttle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned int control_state;
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
priv->rx_flags |= THROTTLED;
|
|
if (C_CRTSCTS(tty)) {
|
|
priv->control_state &= ~TIOCM_RTS;
|
|
control_state = priv->control_state;
|
|
spin_unlock_irq(&priv->lock);
|
|
mct_u232_set_modem_ctrl(port, control_state);
|
|
} else {
|
|
spin_unlock_irq(&priv->lock);
|
|
}
|
|
}
|
|
|
|
static void mct_u232_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct mct_u232_private *priv = usb_get_serial_port_data(port);
|
|
unsigned int control_state;
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
|
|
priv->rx_flags &= ~THROTTLED;
|
|
priv->control_state |= TIOCM_RTS;
|
|
control_state = priv->control_state;
|
|
spin_unlock_irq(&priv->lock);
|
|
mct_u232_set_modem_ctrl(port, control_state);
|
|
} else {
|
|
spin_unlock_irq(&priv->lock);
|
|
}
|
|
}
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|