/*
 * Driver for ST5481 USB ISDN modem
 *
 * Author       Frode Isaksen
 * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
 *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

/* 
 * TODO:
 *
 * b layer1 delay?
 * hotplug / unregister issues
 * mod_inc/dec_use_count
 * unify parts of d/b channel usb handling
 * file header
 * avoid copy to isoc buffer?
 * improve usb delay?
 * merge l1 state machines?
 * clean up debug
 */

#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include "st5481.h"

MODULE_DESCRIPTION("ISDN4Linux: driver for ST5481 USB ISDN adapter");
MODULE_AUTHOR("Frode Isaksen");
MODULE_LICENSE("GPL");

static int protocol = 2;       /* EURO-ISDN Default */
MODULE_PARM(protocol, "i");

static int number_of_leds = 2;       /* 2 LEDs on the adpater default */
MODULE_PARM(number_of_leds, "i");

#ifdef CONFIG_HISAX_DEBUG
static int debug = 0x1;
MODULE_PARM(debug, "i");
int st5481_debug;
#endif

static LIST_HEAD(adapter_list);

/* ======================================================================
 * registration/deregistration with the USB layer
 */

/*
 * This function will be called when the adapter is plugged
 * into the USB bus.
 */
static void * __devinit probe_st5481(struct usb_device *dev,
                                     unsigned int ifnum,
                                     const struct usb_device_id *id)
{
        struct st5481_adapter *adapter;
        struct hisax_b_if *b_if[2];
        int retval, i;

        printk(KERN_INFO "st541: found adapter VendorId %04x, ProductId %04x, LEDs %d\n",
             dev->descriptor.idVendor, dev->descriptor.idProduct,
             number_of_leds);

        adapter = kmalloc(sizeof(struct st5481_adapter), GFP_KERNEL);
        if (!adapter)
                return NULL;

        memset(adapter, 0, sizeof(struct st5481_adapter));

        adapter->number_of_leds = number_of_leds;
        adapter->usb_dev = dev;

        SET_MODULE_OWNER(&adapter->hisax_d_if);
        adapter->hisax_d_if.ifc.priv = adapter;
        adapter->hisax_d_if.ifc.l2l1 = st5481_d_l2l1;

        for (i = 0; i < 2; i++) {
                adapter->bcs[i].adapter = adapter;
                adapter->bcs[i].channel = i;
                adapter->bcs[i].b_if.ifc.priv = &adapter->bcs[i];
                adapter->bcs[i].b_if.ifc.l2l1 = st5481_b_l2l1;
        }
        list_add(&adapter->list, &adapter_list);

        retval = st5481_setup_usb(adapter);
        if (retval < 0)
                goto err;

        retval = st5481_setup_d(adapter);
        if (retval < 0)
                goto err_usb;

        retval = st5481_setup_b(&adapter->bcs[0]);
        if (retval < 0)
                goto err_d;

        retval = st5481_setup_b(&adapter->bcs[1]);
        if (retval < 0)
                goto err_b;

        for (i = 0; i < 2; i++)
                b_if[i] = &adapter->bcs[i].b_if;

        hisax_register(&adapter->hisax_d_if, b_if, "st5481_usb", protocol);
        st5481_start(adapter);

        return adapter;

 err_b:
        st5481_release_b(&adapter->bcs[0]);
 err_d:
        st5481_release_d(adapter);
 err_usb:
        st5481_release_usb(adapter);
 err:
        return NULL;
}

/*
 * This function will be called when the adapter is removed
 * from the USB bus.
 */
static void __devexit disconnect_st5481(struct usb_device *dev, void *arg)
{
        struct st5481_adapter *adapter = arg;

        DBG(1,"");

        list_del(&adapter->list);

        st5481_stop(adapter);
        st5481_release_b(&adapter->bcs[1]);
        st5481_release_b(&adapter->bcs[0]);
        st5481_release_d(adapter);
        // we would actually better wait for completion of outstanding urbs
        mdelay(2);
        st5481_release_usb(adapter);

        hisax_unregister(&adapter->hisax_d_if);

        kfree(adapter);
}

/*
 * The last 4 bits in the Product Id is set with 4 pins on the chip.
 */
static struct usb_device_id st5481_ids[] = {
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x0) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x1) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x2) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x3) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x4) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x5) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x6) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x7) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x8) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x9) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xA) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xB) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xC) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xD) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xE) },
        { USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0xF) },
        { }
};
MODULE_DEVICE_TABLE (usb, st5481_ids);

static struct usb_driver st5481_usb_driver = {
        name: "st5481_usb",
        probe: probe_st5481,
        disconnect: __devexit_p(disconnect_st5481),
        id_table: st5481_ids,
};

static int __init st5481_usb_init(void)
{
        int retval;

#ifdef CONFIG_HISAX_DEBUG
        st5481_debug = debug;
#endif

        printk(KERN_INFO "hiax_st5481: ST5481 USB ISDN driver v0.1.0\n");

        retval = st5481_d_init();
        if (retval < 0)
                goto out;

        retval = usb_register(&st5481_usb_driver);
        if (retval < 0)
                goto out_d_exit;

        return 0;

 out_d_exit:
        st5481_d_exit();
 out:
        return retval;
}

static void __exit st5481_usb_exit(void)
{
        usb_deregister(&st5481_usb_driver);
}

module_init(st5481_usb_init);
module_exit(st5481_usb_exit);