/*
 * 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/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_param(protocol, int, 0);

static int number_of_leds = 2;       /* 2 LEDs on the adpater default */
module_param(number_of_leds, int, 0);

#ifdef CONFIG_HISAX_DEBUG
static int debug = 0;
module_param(debug, int, 0);
#endif
int st5481_debug;

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

/*
 * This function will be called when the adapter is plugged
 * into the USB bus.
 */
static int probe_st5481(struct usb_interface *intf,
                        const struct usb_device_id *id)
{
        struct usb_device *dev = interface_to_usbdev(intf);
        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",
               le16_to_cpu(dev->descriptor.idVendor),
               le16_to_cpu(dev->descriptor.idProduct),
               number_of_leds);

        adapter = kzalloc(sizeof(struct st5481_adapter), GFP_KERNEL);
        if (!adapter)
                return -ENOMEM;

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

        adapter->hisax_d_if.owner = THIS_MODULE;
        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;
        }

        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;

        if (hisax_register(&adapter->hisax_d_if, b_if, "st5481_usb",
                           protocol) != 0)
                goto err_b1;

        st5481_start(adapter);

        usb_set_intfdata(intf, adapter);
        return 0;

err_b1:
        st5481_release_b(&adapter->bcs[1]);
err_b:
        st5481_release_b(&adapter->bcs[0]);
err_d:
        st5481_release_d(adapter);
err_usb:
        st5481_release_usb(adapter);
err:
        kfree(adapter);
        return -EIO;
}

/*
 * This function will be called when the adapter is removed
 * from the USB bus.
 */
static void disconnect_st5481(struct usb_interface *intf)
{
        struct st5481_adapter *adapter = usb_get_intfdata(intf);

        DBG(1, "");

        usb_set_intfdata(intf, NULL);
        if (!adapter)
                return;

        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 =   disconnect_st5481,
        .id_table =     st5481_ids,
        .disable_hub_initiated_lpm = 1,
};

static int __init st5481_usb_init(void)
{
        int retval;

#ifdef CONFIG_HISAX_DEBUG
        st5481_debug = debug;
#endif

        printk(KERN_INFO "hisax_st5481: ST5481 USB ISDN driver $Revision: 2.4.2.3 $\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);
        st5481_d_exit();
}

module_init(st5481_usb_init);
module_exit(st5481_usb_exit);