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/*
 * USB Serial Converter Generic functions
 *
 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License version
 *      2 as published by the Free Software Foundation.
 *
 */


#include <linuxcomp.h>

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <asm/uaccess.h>

#ifdef CONFIG_USB_SERIAL_DEBUG
        static int debug = 1;
#else
        static int debug;
#endif

#include "usb-serial.h"

       
#ifdef CONFIG_USB_SERIAL_GENERIC
static __u16 vendor  = 0x05f9;
static __u16 product = 0xffff;

MODULE_PARM(vendor, "h");
MODULE_PARM_DESC(vendor, "User specified USB idVendor");

MODULE_PARM(product, "h");
MODULE_PARM_DESC(product, "User specified USB idProduct");

static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */

/* All of the device info needed for the Generic Serial Converter */
struct usb_serial_device_type usb_serial_generic_device = {
        .owner =                THIS_MODULE,
        .name =                 "Generic",
        .short_name =           "generic",
        .id_table =             generic_device_ids,
        .num_interrupt_in =     NUM_DONT_CARE,
        .num_bulk_in =          NUM_DONT_CARE,
        .num_bulk_out =         NUM_DONT_CARE,
        .num_ports =            1,
        .shutdown =             usb_serial_generic_shutdown,
};
#endif

int usb_serial_generic_register (int _debug)
{
        int retval = 0;

        debug = _debug;
#ifdef CONFIG_USB_SERIAL_GENERIC
        generic_device_ids[0].idVendor = vendor;
        generic_device_ids[0].idProduct = product;
        generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;

        /* register our generic driver with ourselves */
        retval = usb_serial_register (&usb_serial_generic_device);
#endif
        return retval;
}

void usb_serial_generic_deregister (void)
{
#ifdef CONFIG_USB_SERIAL_GENERIC
        /* remove our generic driver */
        usb_serial_deregister (&usb_serial_generic_device);
#endif
}

int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp)
{
        struct usb_serial *serial = port->serial;
        int result = 0;

        if (port_paranoia_check (port, __FUNCTION__))
                return -ENODEV;

        dbg("%s - port %d", __FUNCTION__, port->number);

        /* force low_latency on so that our tty_push actually forces the data through,
           otherwise it is scheduled, and with high data rates (like with OHCI) data
           can get lost. */

        if (port->tty)
                port->tty->low_latency = 1;

        /* if we have a bulk interrupt, start reading from it */
        if (serial->num_bulk_in) {
                /* Start reading from the device */
                usb_fill_bulk_urb (port->read_urb, serial->dev,
                                   usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
                                   port->read_urb->transfer_buffer,
                                   port->read_urb->transfer_buffer_length,
                                   ((serial->type->read_bulk_callback) ?
                                     serial->type->read_bulk_callback :
                                     usb_serial_generic_read_bulk_callback),
                                   port);
                result = usb_submit_urb(port->read_urb, GFP_KERNEL);
                if (result)
                        dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
        }

        return result;
}

static void generic_cleanup (struct usb_serial_port *port)
{
        struct usb_serial *serial = port->serial;

        dbg("%s - port %d", __FUNCTION__, port->number);

        if (serial->dev) {
                /* shutdown any bulk reads that might be going on */
                if (serial->num_bulk_out)
                        usb_unlink_urb (port->write_urb);
                if (serial->num_bulk_in)
                        usb_unlink_urb (port->read_urb);
        }
}

void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
{
        dbg("%s - port %d", __FUNCTION__, port->number);
        generic_cleanup (port);
}

int usb_serial_generic_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count)
{
        struct usb_serial *serial = port->serial;
        int result;

        dbg("%s - port %d", __FUNCTION__, port->number);

        if (count == 0) {
                dbg("%s - write request of 0 bytes", __FUNCTION__);
                return (0);
        }

        /* only do something if we have a bulk out endpoint */
        if (serial->num_bulk_out) {
                if (port->write_urb->status == -EINPROGRESS) {
                        dbg("%s - already writing", __FUNCTION__);
                        return (0);
                }

                count = (count > port->bulk_out_size) ? port->bulk_out_size : count;

                if (from_user) {
                        if (copy_from_user(port->write_urb->transfer_buffer, buf, count))
                                return -EFAULT;
                }
                else {
                        memcpy (port->write_urb->transfer_buffer, buf, count);
                }

                usb_serial_debug_data (__FILE__, __FUNCTION__, count, port->write_urb->transfer_buffer);

                /* set up our urb */
                usb_fill_bulk_urb (port->write_urb, serial->dev,
                                   usb_sndbulkpipe (serial->dev,
                                                    port->bulk_out_endpointAddress),
                                   port->write_urb->transfer_buffer, count,
                                   ((serial->type->write_bulk_callback) ?
                                     serial->type->write_bulk_callback :
                                     usb_serial_generic_write_bulk_callback), port);

                /* send the data out the bulk port */
                result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
                if (result)
                        dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
                else
                        result = count;

                return result;
        }

        /* no bulk out, so return 0 bytes written */
        return (0);
}

int usb_serial_generic_write_room (struct usb_serial_port *port)
{
        struct usb_serial *serial = port->serial;
        int room = 0;

        dbg("%s - port %d", __FUNCTION__, port->number);
       
        if (serial->num_bulk_out) {
                if (port->write_urb->status != -EINPROGRESS)
                        room = port->bulk_out_size;
        }

        dbg("%s - returns %d", __FUNCTION__, room);
        return (room);
}

int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
{
        struct usb_serial *serial = port->serial;
        int chars = 0;

        dbg("%s - port %d", __FUNCTION__, port->number);

        if (serial->num_bulk_out) {
                if (port->write_urb->status == -EINPROGRESS)
                        chars = port->write_urb->transfer_buffer_length;
        }

        dbg("%s - returns %d", __FUNCTION__, chars);
        return (chars);
}

void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
        struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
        struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
        struct tty_struct *tty;
        unsigned char *data = urb->transfer_buffer;
        int i;
        int result;

        dbg("%s - port %d", __FUNCTION__, port->number);

        if (!serial) {
                dbg("%s - bad serial pointer, exiting", __FUNCTION__);
                return;
        }

        if (urb->status) {
                dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
                return;
        }

        usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);

        tty = port->tty;
        if (tty && urb->actual_length) {
                for (i = 0; i < urb->actual_length ; ++i) {
                        /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
                        if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
                                tty_flip_buffer_push(tty);
                        }
                        /* this doesn't actually push the data through unless tty->low_latency is set */
                        tty_insert_flip_char(tty, data[i], 0);
                }
                tty_flip_buffer_push(tty);
        }

        /* Continue trying to always read  */
        usb_fill_bulk_urb (port->read_urb, serial->dev,
                           usb_rcvbulkpipe (serial->dev,
                                            port->bulk_in_endpointAddress),
                           port->read_urb->transfer_buffer,
                           port->read_urb->transfer_buffer_length,
                           ((serial->type->read_bulk_callback) ?
                             serial->type->read_bulk_callback :
                             usb_serial_generic_read_bulk_callback), port);
        result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
        if (result)
                dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}

void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
        struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
        struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);

        dbg("%s - port %d", __FUNCTION__, port->number);

        if (!serial) {
                dbg("%s - bad serial pointer, exiting", __FUNCTION__);
                return;
        }

        if (urb->status) {
                dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
                return;
        }

        usb_serial_port_softint((void *)port);

        schedule_work(&port->work);
}

void usb_serial_generic_shutdown (struct usb_serial *serial)
{
        int i;

        dbg("%s", __FUNCTION__);

        /* stop reads and writes on all ports */
        for (i=0; i < serial->num_ports; ++i) {
                generic_cleanup(serial->port[i]);
        }
}