linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Opticon USB barcode to serial driver

 *

 * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>

 * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>

 * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>

 * Copyright (C) 2008 - 2009 Novell Inc.

 */

​

#include <linux/kernel.h>

#include <linux/tty.h>

#include <linux/tty_driver.h>

#include <linux/slab.h>

#include <linux/tty_flip.h>

#include <linux/serial.h>

#include <linux/module.h>

#include <linux/usb.h>

#include <linux/usb/serial.h>

#include <linux/uaccess.h>

​

#define CONTROL_RTS         0x02

#define RESEND_CTS_STATE    0x03

​

/* max number of write urbs in flight */

#define URB_UPPER_LIMIT 8

​

/* This driver works for the Opticon 1D barcode reader

 * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */

#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"

​

static const struct usb_device_id id_table[] = {

    { USB_DEVICE(0x065a, 0x0009) },

    { },

};

MODULE_DEVICE_TABLE(usb, id_table);

​

/* This structure holds all of the individual device information */

struct opticon_private {

    spinlock_t lock;    /* protects the following flags */

    bool rts;

    bool cts;

    int outstanding_urbs;

};

​

​

static void opticon_process_data_packet(struct usb_serial_port *port,

                    const unsigned char *buf, size_t len)

{

    tty_insert_flip_string(&port->port, buf, len);

    tty_flip_buffer_push(&port->port);

}

​

static void opticon_process_status_packet(struct usb_serial_port *port,

                    const unsigned char *buf, size_t len)

{

    struct opticon_private *priv = usb_get_serial_port_data(port);

    unsigned long flags;

​

    spin_lock_irqsave(&priv->lock, flags);

    if (buf[0] == 0x00)

        priv->cts = false;

    else