linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

  Keyspan USB to Serial Converter driver

​

  (C) Copyright (C) 2000-2001   Hugh Blemings <hugh@blemings.org>

  (C) Copyright (C) 2002    Greg Kroah-Hartman <greg@kroah.com>

​

  See http://blemings.org/hugh/keyspan.html for more information.

​

  Code in this driver inspired by and in a number of places taken

  from Brian Warner's original Keyspan-PDA driver.

​

  This driver has been put together with the support of Innosys, Inc.

  and Keyspan, Inc the manufacturers of the Keyspan USB-serial products.

  Thanks Guys :)

​

  Thanks to Paulus for miscellaneous tidy ups, some largish chunks

  of much nicer and/or completely new code and (perhaps most uniquely)

  having the patience to sit down and explain why and where he'd changed

  stuff.

​

  Tip 'o the hat to IBM (and previously Linuxcare :) for supporting

  staff in their work on open source projects.

*/

​

​

#include <linux/kernel.h>

#include <linux/jiffies.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <linux/tty.h>

#include <linux/tty_driver.h>

#include <linux/tty_flip.h>

#include <linux/module.h>

#include <linux/spinlock.h>

#include <linux/uaccess.h>

#include <linux/usb.h>

#include <linux/usb/serial.h>

#include <linux/usb/ezusb.h>

​

#define DRIVER_AUTHOR "Hugh Blemings <hugh@misc.nu"

#define DRIVER_DESC "Keyspan USB to Serial Converter Driver"

​

/* Function prototypes for Keyspan serial converter */

static int keyspan_open(struct tty_struct *tty, struct usb_serial_port *port);

static void keyspan_close(struct usb_serial_port *port);

static void keyspan_dtr_rts(struct usb_serial_port *port, int on);

static int keyspan_startup(struct usb_serial *serial);

static void keyspan_disconnect(struct usb_serial *serial);

static void keyspan_release(struct usb_serial *serial);

static int keyspan_port_probe(struct usb_serial_port *port);

static int keyspan_port_remove(struct usb_serial_port *port);

static int keyspan_write_room(struct tty_struct *tty);

static int keyspan_write(struct tty_struct *tty, struct usb_serial_port *port,

             const unsigned char *buf, int count);

static void keyspan_send_setup(struct usb_serial_port *port, int reset_port);

static void keyspan_set_termios(struct tty_struct *tty,

                struct usb_serial_port *port,

                struct ktermios *old);

static void keyspan_break_ctl(struct tty_struct *tty, int break_state);

static int keyspan_tiocmget(struct tty_struct *tty);

static int keyspan_tiocmset(struct tty_struct *tty, unsigned int set,

                unsigned int clear);

static int keyspan_fake_startup(struct usb_serial *serial);

​

static int keyspan_usa19_calc_baud(struct usb_serial_port *port,

                   u32 baud_rate, u32 baudclk,

                   u8 *rate_hi, u8 *rate_low,

                   u8 *prescaler, int portnum);

static int keyspan_usa19w_calc_baud(struct usb_serial_port *port,

                    u32 baud_rate, u32 baudclk,

                    u8 *rate_hi, u8 *rate_low,

                    u8 *prescaler, int portnum);

static int keyspan_usa28_calc_baud(struct usb_serial_port *port,

                   u32 baud_rate, u32 baudclk,

                   u8 *rate_hi, u8 *rate_low,

                   u8 *prescaler, int portnum);

static int keyspan_usa19hs_calc_baud(struct usb_serial_port *port,

                     u32 baud_rate, u32 baudclk,

                     u8 *rate_hi, u8 *rate_low,

                     u8 *prescaler, int portnum);

​

static int keyspan_usa28_send_setup(struct usb_serial *serial,

                    struct usb_serial_port *port,

                    int reset_port);

static int keyspan_usa26_send_setup(struct usb_serial *serial,

                    struct usb_serial_port *port,

                    int reset_port);

static int keyspan_usa49_send_setup(struct usb_serial *serial,

                    struct usb_serial_port *port,

                    int reset_port);

static int keyspan_usa90_send_setup(struct usb_serial *serial,